TWI651608B - Adapter and charging control method - Google Patents

Abstract

An embodiment of the present invention provides an adapter and a charging control method. The adapter includes: a power conversion unit, a voltage feedback unit, a current feedback unit, a power adjustment unit, an input end of the power adjustment unit, an output end of the voltage feedback unit, and a current feedback unit. The output ends are connected, the output of the power adjustment unit is connected to the power conversion unit, and the power adjustment unit is configured to receive the voltage feedback signal and the current feedback signal, and the voltage feedback signal indicates that the output voltage of the adapter reaches the target voltage, or the current feedback signal indicates the adapter. When the output current reaches the target current, the output voltage and output current of the adapter are stabilized. The adapter provided by the embodiment of the invention can improve the security of the charging procedure.

Description

Adapter and charging control method

Embodiments of the present invention relate to the field of charging technology, and, more particularly, to an adapter and a charging control method.

The adapter, also known as a power adapter, is used to charge a device to be charged, such as a terminal. At present, adapters on the market usually use a constant voltage method to charge a device to be charged (such as a terminal). When the current drawn by the device to be charged (such as a terminal) exceeds the maximum current output threshold that the adapter can provide, it may cause The adapter enters the overload protection state and cannot continue charging the charging device (such as the terminal).

Embodiments of the present invention provide an adapter and a charging control method to improve the security of a charging procedure.

In a first aspect, an adapter is provided, the adapter supporting a first charging mode and a second charging mode, wherein the adapter charges a charging device faster than the adapter in the first charging mode in the second charging mode Under the charging speed of the device to be charged, the adapter comprises: a power conversion unit, configured to convert the input alternating current to obtain an output voltage and an output current of the adapter; and a voltage feedback unit, the input end of the voltage feedback unit The power conversion unit is connected to the voltage feedback unit for detecting the output voltage of the adapter to generate a voltage feedback signal, the voltage feedback signal is used to indicate whether the output voltage of the adapter reaches a set target voltage; current feedback a unit, the input end of the current feedback unit is connected to the power conversion unit, and the current feedback unit is configured to detect an output current of the adapter to generate a current feedback signal, the current feedback signal is used to indicate an output current of the adapter Whether the set target current is reached; the power adjustment sheet The input end of the power adjustment unit is connected to the output end of the voltage feedback unit and the output end of the current feedback unit, and the output end of the power adjustment unit is connected to the power conversion unit, and the power adjustment unit is configured to receive the voltage feedback The signal and the current feedback signal, and when the voltage feedback signal indicates that the output voltage of the adapter reaches the target voltage, or the current feedback signal indicates that the output current of the adapter reaches the target current, the output voltage of the adapter is stabilized and Output current; charging interface, the adapter communicates bidirectionally with the device to be charged through a data line in the charging interface.

In a second aspect, a charging control method is provided, the method being applied to an adapter, the adapter supporting a first charging mode and a second charging mode, wherein the adapter charges the device to be charged faster than the device to be charged in the second charging mode The charging speed of the adapter to the charging device in the first charging mode, the method comprising: converting the input alternating current to obtain an output voltage and an output current of the adapter; detecting an output voltage of the adapter, to Generating a voltage feedback signal, the voltage feedback signal is used to indicate whether the output voltage of the adapter reaches a set target voltage; detecting an output current of the adapter to generate a current feedback signal, the current feedback signal is used to indicate the Whether the output current of the adapter reaches a set target current; the adapter is stabilized when the voltage feedback signal indicates that the output voltage of the adapter reaches the target voltage, or the current feedback signal indicates that the output current of the adapter reaches the target current Output voltage and output current; The data interface lines and the two-way communication device to be charged.

The adapter of the embodiment of the invention includes both a voltage feedback unit and a current feedback unit, wherein the voltage feedback unit, the power adjustment unit and the power conversion unit form a hardware circuit for performing closed-loop control on the output voltage of the adapter, that is, a hardware form. The voltage feedback loop; the current feedback unit, the power adjustment unit and the power conversion unit form a hardware circuit for performing closed-loop control of the output current of the adapter, that is, a current feedback loop in the form of a hardware. On the basis of the dual-loop feedback control, the power adjustment unit of the embodiment of the present invention comprehensively considers the feedback information provided by the voltage feedback signal and the current feedback signal, and reaches the target value at any one of the output voltage of the adapter and the output current of the adapter. In this case, stabilize the adapter's output voltage and output current. In other words, in the embodiment of the present invention, when any one of the output voltage and the output current of the adapter reaches the target value, the power adjustment unit can immediately sense the occurrence of the event and immediately respond to the event to stabilize. The output voltage and output current of the adapter increase the safety of the charging process.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

A first adapter for charging a device to be charged, such as a terminal, is mentioned in the related art. The first adapter operates in a constant voltage mode. In the constant voltage mode, the voltage output by the first adapter is maintained substantially constant, such as 5V, 9V, 12V or 20V.

The voltage output by the first adapter is not suitable for direct loading to both ends of the battery, but needs to be converted by a conversion circuit in a device to be charged (such as a terminal) to obtain a battery expected in the device to be charged (such as a terminal). Charging voltage and / or charging current.

A conversion circuit is used to transform the voltage output by the first adapter to meet the demand for the charging voltage and/or charging current expected by the battery.

As an example, the conversion circuit may refer to a charge management module, such as a charging integrated circuit (IC). In the charging process of the battery, it is used to manage the charging voltage and/or charging current of the battery. The conversion circuit has the function of a voltage feedback module and/or has the function of a current feedback module to implement management of the charging voltage and/or charging current of the battery.

For example, the charging procedure of the battery may include one or a plurality of trickle charging phases, a constant current charging phase, and a constant voltage charging phase. In the trickle charge phase, the conversion circuit can utilize the current feedback loop such that the current entering the battery during the trickle charge phase meets the magnitude of the charge current expected by the battery (eg, the first charge current). In the constant current charging phase, the conversion circuit can utilize the current feedback loop such that the current entering the battery during the constant current charging phase satisfies the magnitude of the charging current expected by the battery (eg, the second charging current, which can be greater than the first charging current) . In the constant voltage charging phase, the conversion circuit can utilize the voltage feedback loop such that the voltage loaded across the battery during the constant voltage charging phase meets the expected charging voltage of the battery.

As an example, when the voltage output by the first adapter is greater than the charging voltage expected by the battery, the conversion circuit can be used to step down the voltage output by the first adapter, so that the charging voltage obtained after the step-down conversion meets the expected battery The charging voltage is required. As still another example, when the voltage output by the first adapter is less than the charging voltage expected by the battery, the conversion circuit may be configured to perform a voltage boosting process on the voltage output by the first adapter, so that the charging voltage obtained after the boosting conversion satisfies the battery Expected charging voltage requirements.

As another example, taking the first adapter outputting a constant voltage of 5V as an example, when the battery includes a single battery core (taking a lithium battery cell as an example, the charge cutoff voltage of a single cell is 4.2V), the conversion circuit (for example, Buck is lowered). The voltage circuit can perform a step-down process on the voltage outputted by the first adapter, so that the charging voltage obtained after the voltage reduction satisfies the charging voltage demand expected by the battery.

As another example, taking the first adapter outputting a constant voltage of 5V as an example, when the first adapter is a battery having two or more single cells connected in series (taking a lithium battery cell as an example, a charging cutoff voltage of a single cell) When charging 4.2V), a conversion circuit (such as a boost voltage boosting circuit) can boost the voltage outputted by the first adapter so that the charging voltage obtained after boosting satisfies the charging voltage demand expected by the battery.

The conversion circuit is limited by the low conversion efficiency of the circuit, so that the electric energy of the unconverted portion is dissipated as heat. This part of the heat will be focused inside the device to be charged (such as the terminal). The design space and heat dissipation space of the device to be charged (such as the terminal) are small (for example, the size of the mobile terminal used by the user is getting thinner and lighter, and a large number of electronic components are densely arranged in the mobile terminal to enhance the mobile terminal. Performance), which not only improves the design difficulty of the conversion circuit, but also causes the heat concentrated in the device to be charged (such as the terminal) to be difficult to remove in time, thereby causing an abnormality of the device to be charged (such as a terminal).

For example, the heat accumulated on the conversion circuit may cause thermal interference to the electronic components near the conversion circuit, causing abnormal operation of the electronic components. As another example, the heat accumulated on the conversion circuit may shorten the life of the conversion circuit and nearby electronic components. Another example is that the heat accumulated on the circuit may cause thermal interference to the battery, which may cause abnormal battery charging and discharging. Another example is the heat accumulated on the circuit, which may cause the temperature of the device to be charged (such as the terminal) to rise, affecting the user's experience in charging. For another example, the heat accumulated on the conversion circuit may cause a short circuit of the conversion circuit itself, so that the voltage outputted by the first adapter is directly loaded at both ends of the battery, causing charging abnormality. If the battery is in an overvoltage state for a long time, even Causes battery explosion, endangering user safety.

Embodiments of the present invention provide a second adapter whose output voltage is adjustable. The second adapter is capable of acquiring status information of the battery. The status information of the battery may include current battery information and/or voltage information of the battery. The second adapter can adjust the output voltage of the second adapter itself according to the acquired state information of the battery to meet the demand of the charging voltage and/or the charging current expected by the battery. Further, during the constant current charging phase of the battery charging program, the voltage output by the second adapter can be directly loaded at both ends of the battery to charge the battery.

The second adapter can have the function of a voltage feedback module and the function of the current feedback module to implement management of the charging voltage and/or charging current of the battery.

The second adapter adjusts the output voltage of the second adapter according to the acquired state information of the battery. The second adapter can obtain the status information of the battery in real time, and according to the instantaneous status information of the obtained battery. The voltage output by the second adapter itself is adjusted to meet the expected charging voltage and/or charging current of the battery.

The second adapter adjusts the output voltage of the second adapter according to the state information of the battery that is acquired immediately. The second adapter can obtain the current state of the battery at different times in the charging process as the battery voltage increases continuously during the charging process. Status information, and instantly adjust the output voltage of the second adapter itself according to the current state information of the battery to meet the demand of the battery's expected charging voltage and/or charging current.

For example, the charging procedure of the battery may include one or a plurality of trickle charging phases, a constant current charging phase, and a constant voltage charging phase. During the trickle charge phase, the second adapter can utilize the current feedback loop such that the current output by the second adapter during the trickle charge phase and the current entering the battery meets the demand for the battery's expected charging current (eg, the first charging current). In the constant current charging phase, the second adapter can utilize the current feedback loop such that the current output by the second adapter during the constant current charging phase and the current entering the battery meets the demand for the charging current expected by the battery (eg, the second charging current, the second The charging current can be greater than the first charging current), and in the constant current charging phase, the second adapter can load the output charging voltage directly across the battery to charge the battery. During the constant voltage charging phase, the second adapter can utilize the voltage feedback loop such that the voltage output by the second adapter during the constant voltage charging phase meets the demand for the charging voltage expected by the battery.

For the trickle charging phase and the constant voltage charging phase, the voltage output by the second adapter may be processed in a manner similar to that of the first adapter, that is, through a conversion circuit in a device to be charged (eg, a terminal) to obtain a device to be charged (eg, The expected charging voltage and/or charging current of the battery within the terminal).

Optionally, as an implementation manner, the current feedback loop of the second adapter can be implemented in a software manner on the basis of the voltage feedback loop. Specifically, when the charging current output by the second adapter does not meet the requirement, the second adapter may calculate a desired charging voltage according to the expected charging current, and adjust the charging voltage output by the second adapter to the calculated voltage through the voltage feedback loop. The desired charging voltage is equivalent to the function of the current feedback loop by means of a voltage feedback loop through a software. However, in the process of charging the battery by means of constant voltage, the load current on the charging circuit often changes rapidly. If the second adapter realizes the current feedback loop through the software, it needs to perform current sampling, current voltage conversion, etc. The operation causes the second adapter to respond slowly to the load current, which may cause the current to be charged by the device to be charged (such as the terminal) to exceed the maximum current output threshold that the second adapter can provide, causing the second adapter to enter the overload protection. In the state, it is not possible to continue charging the charging device (such as a terminal).

In order to increase the response speed of the second adapter to the load current, a voltage feedback loop in the form of a hard body and a current feedback loop in the form of a hardware may be disposed inside the second adapter, which will be described in detail below in conjunction with FIG. 1A.

Fig. 1A is a schematic structural view of a second adapter of an embodiment of the present invention. The second adapter 10 of FIG. 1A may include a power conversion unit 11, a voltage feedback unit 12, a current feedback unit 13, and a power adjustment unit 14.

The power conversion unit 11 is configured to convert the input alternating current to obtain an output voltage and an output current of the second adapter 10.

The input end of the voltage feedback unit 12 is connected to the power conversion unit 11. The voltage feedback unit 12 is configured to detect the output voltage of the second adapter 10 to generate a voltage feedback signal, and the voltage feedback signal is used to indicate the output of the second adapter 10. Whether the voltage reaches a set target voltage.

The input end of the current feedback unit 13 is connected to the power conversion unit 11. The current feedback unit 13 is configured to detect the output current of the second adapter 10 to generate a current feedback signal, and the current feedback signal is used to indicate the output of the second adapter 10. Whether the current reaches a set target current.

The input end of the power adjustment unit 14 is connected to the output end of the voltage feedback unit 12 and the output end of the current feedback unit 13. The output end of the power adjustment unit 14 is connected to the power conversion unit 11, and the power adjustment unit 14 is configured to receive the voltage feedback signal and The current feedback signal, and when the voltage feedback signal indicates that the output voltage of the second adapter 10 reaches the target voltage, or the current feedback signal indicates that the output current of the second adapter 10 reaches the target current, the output voltage and output of the second adapter 10 are stabilized. Current.

Stabilizing the output voltage and output current of the second adapter 10 by the power adjustment unit 14 may mean that the power adjustment unit 14 controls the output voltage and output current of the second adapter 10 to remain unchanged. Taking the power adjustment unit 14 as a pulse width modulation (PWM) power adjustment unit as an example, in the case where the frequency and duty ratio of the PWM control signal remain unchanged, the output voltage of the second adapter 10 is The output current is stable.

The second adapter of the embodiment of the invention includes both a voltage feedback unit and a current feedback unit, wherein the voltage feedback unit, the power adjustment unit and the power conversion unit form a hardware circuit for performing closed-loop control on the output voltage of the second adapter, That is, the voltage feedback loop in the form of a hardware; the current feedback unit, the power adjustment unit, and the power conversion unit form a hardware circuit for performing closed-loop control of the output current of the second adapter, that is, a current feedback loop in the form of a hardware. On the basis of the dual-loop feedback control, the power adjustment unit of the embodiment of the present invention comprehensively considers the feedback information provided by the voltage feedback signal and the current feedback signal, and is arbitrary in the output voltage of the second adapter and the output current of the second adapter. The output voltage and output current of the second adapter are stabilized when a target value is reached. In other words, in the embodiment of the present invention, when any one of the output voltage and the output current of the second adapter reaches the target value, the power adjustment unit can immediately sense the occurrence of the event and immediately respond to the event. In order to stabilize the output voltage and output current of the second adapter, the safety of the charging procedure is improved.

Taking the constant voltage mode as an example, the voltage feedback loop is mainly responsible for adjusting the output voltage of the second adapter to the voltage corresponding to the constant voltage mode, and the current feedback loop can be responsible for detecting whether the output current of the second adapter reaches the target current (the target current at this time) It can be the maximum current allowed in the constant voltage mode. Once the output current of the second adapter reaches the target current, the power adjustment unit can immediately sense this event through the current feedback loop and stabilize the output current of the second adapter in time to prevent it. Further increase. Similarly, in the constant current mode, the current feedback loop can be responsible for adjusting the output current of the second adapter to the current corresponding to the constant current mode, and the voltage feedback loop can be responsible for detecting whether the output voltage of the second adapter reaches the target voltage (at this time) The target voltage can be the maximum voltage allowed in the constant current mode. Once the output voltage reaches the target voltage, the power adjustment unit can immediately sense this event through the voltage feedback loop, and stabilize the output voltage of the second adapter in time to prevent further increase. Big.

The voltage feedback signal and the current feedback signal are different from the objects that are fed back. It is not necessary to limit the signal type of the voltage feedback signal and the current feedback signal. Specifically, the voltage feedback signal can be used to feedback the output voltage of the second adapter, and the current feedback signal can be used to feed back the output current of the second adapter, but both can be voltage signals.

The target voltage may be a preset fixed value or an adjustable variable. In some embodiments, the second adapter 10 can adjust the voltage value of the target voltage through a certain adjustment circuit according to actual needs. For example, the device to be charged (terminal) may send an adjustment command of the target voltage to the second adapter, and the second adapter 10 adjusts the voltage value of the target voltage according to the adjustment command of the target voltage. For another example, the second adapter 10 can receive status information of the battery from the device to be charged, and instantly adjust the voltage value of the target voltage according to the state of the battery. Similarly, the target current can be a preset fixed value or an adjustable variable. In some embodiments, the second adapter 10 can adjust the voltage value of the target current through a certain adjustment circuit according to actual needs. For example, the device to be charged (terminal) can send an adjustment command of the target current to the second adapter 10, and second. The adapter 10 adjusts the voltage value of the target current according to the adjustment command of the target current. For another example, the second adapter 10 can receive status information of the battery from the device to be charged, and instantly adjust the current value of the target current according to the state of the battery.

The device to be charged used in the embodiment of the present invention may be a “communication terminal” (or simply “terminal”), including but not limited to being configured to be connected via a wire line (eg, via a public switched telephone network). , PSTN), digital subscriber line (DSL), digital cable, direct cable connection, and/or another data connection/network) and/or via (eg, for cellular networks, wireless local area networks) (wireless local area network, WLAN), digital television network such as handheld digital video broadcasting (DVB-H) network, satellite network, amplitude modulation-frequency modulation (AM-FM) A device for receiving/transmitting a communication signal by a broadcast transmitter, and/or a wireless interface of another communication terminal. Communication terminals that are configured to communicate over a wireless interface may be referred to as "wireless communication terminals," "wireless terminals," and/or "mobile terminals." Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal communication system (PCS) terminals that can combine cellular radio telephones with data processing, faxing, and data communication capabilities; may include radio telephones, pagers, Internet/internet access, web browser, memo pad, calendar, and/or personal digital assistant (PDA) for global positioning system (GPS) receivers; and regular laptops And/or a palm-sized receiver or other electronic device including a radiotelephone transceiver.

In some embodiments, the second adapter 10 can include a control unit (see the MCU in FIG. 23) for controlling the charging program to increase the level of intelligence of the second adapter 10. Specifically, the control unit may be configured to perform bidirectional communication with a device to be charged (such as a terminal) to obtain an instruction or status information of a device to be charged (such as a terminal) (the status information may refer to a current voltage of the battery of the device to be charged and/or The status information of the temperature of the device to be charged, etc., thereby controlling the charging process of the second adapter 10 to be charged (such as a terminal) based on an instruction or status signal of the device to be charged (such as a terminal). In some embodiments, the control unit may be a Microcontroller Unit (MCU), but the embodiment of the present invention is not limited thereto, and may be other types of wafers or circuits.

In some embodiments, the second adapter 10 may include a charging interface (see the charging interface 191 of FIG. 19A). However, the type of the charging interface is not specifically limited in the embodiment of the present invention, for example, may be a universal serial bus (Universal). Serial Bus, USB) interface, the USB interface can be a standard USB interface, a micro USB interface, or a Type-C interface.

The charging mode or function of the second adapter 10 is related to the selection of the target voltage and the target current. The charging mode or function of the second adapter 10 is different, and the values of the target voltage and the target current may also be different, and the following are respectively in the constant voltage mode. The constant current mode is taken as an example for detailed description.

Optionally, in some embodiments, the second adapter 10 supports a first charging mode (ie, the second adapter 10 is operable to charge a device to be charged (eg, a terminal) in the first charging mode). The first charging mode is a constant voltage mode. In the constant voltage mode, the target voltage of the second adapter 10 is the voltage corresponding to the constant voltage mode. The target current is the maximum current that the second adapter 10 is allowed to output in the constant voltage mode. The power adjustment unit 14 is specifically configured to adjust the output voltage of the second adapter 10 to a voltage corresponding to the constant voltage mode according to the voltage feedback signal, and when the current feedback signal indicates that the output current of the second adapter 10 reaches the second adapter 10 at a constant voltage When the maximum current allowed in the mode is allowed, the output current of the second adapter 10 is controlled not to exceed the maximum current allowed to be output by the second adapter 10 in the constant voltage mode.

In the constant voltage mode, the output voltage of the second adapter 10 is adjusted to a certain fixed voltage value, and the voltage corresponding to the constant voltage mode in the above is the fixed voltage value. For example, in the constant voltage mode, the output voltage of the second adapter 10 is 5V, and the voltage corresponding to the constant voltage mode is 5V.

In the embodiment of the invention, the target voltage is set to a voltage corresponding to the constant voltage mode, and the target current is set to a maximum current allowed by the second adapter in the constant voltage mode. In this way, the second adapter can quickly adjust the output voltage of the second adapter to the voltage corresponding to the constant voltage mode based on the voltage feedback loop to perform constant voltage charging for the device to be charged (eg, the terminal). In the constant voltage charging process, once the output current of the second adapter (ie, the load current) reaches the maximum current allowed by the second adapter, the second adapter can sense the situation through the current feedback loop and promptly block the second The further increase in the output current of the adapter avoids the occurrence of a charging fault and improves the ability of the second adapter to respond to the load current.

For example, in the constant voltage mode, if the constant voltage mode corresponds to a fixed voltage value of 5V, the output current of the second adapter is usually maintained between 100mA and 200mA. In this case, the target voltage can be set to a fixed voltage value (such as 5V) and the target current can be set to 500mA or 1A. Once the output current of the second adapter increases to the current value corresponding to the target current, the power adjustment unit 14 can immediately sense the occurrence of this event through the current feedback loop and prevent further increase in the output current of the second adapter.

As shown in FIG. 1B, on the basis of the above embodiment, the power conversion unit 11 may include a primary rectification unit 15, a transformer 16, a primary rectification unit 17, and a primary filtering unit 18, which will pulsate The form of the voltage is output directly to the transformer 16.

In the prior art, the power conversion unit includes both a rectifying unit and a filtering unit on the primary side, and a rectifying unit and a filtering unit on the secondary side. The rectifying unit and the filtering unit located on the primary side may be referred to as a primary rectifying unit and a primary filtering unit. The rectifying unit and the filtering unit on the secondary side may be referred to as a secondary rectifying unit and a primary filtering unit. The primary filter unit is generally filtered by a liquid aluminum electrolytic capacitor. The volume of the liquid aluminum electrolytic capacitor is large, which causes the adapter to be bulky.

In the embodiment of the present invention, the power conversion unit 11 includes a primary rectification unit 15, a transformer 16, a primary rectification unit 17, and a primary filtering unit 18, and the primary rectification unit 15 directly outputs the pulsating voltage to the transformer 16. In other words, the power conversion unit 11 provided by the embodiment of the present invention does not include a primary filtering unit, which can greatly reduce the volume of the second adapter 10, so that the second adapter 10 is more portable. The secondary filtering unit 18 is mainly filtered based on the solid aluminum electrolytic capacitor. After the primary filtering unit in the power conversion unit 11 is removed, although the load capacity of the solid aluminum electrolytic capacitor is limited, due to the existence of the current feedback loop in the form of a hardware It can respond to changes in load current in time to avoid charging failure caused by excessive output current of the second adapter.

In the above-described scheme of removing the primary filtering unit, the maximum current allowed to be output by the second adapter 10 in the constant voltage mode may be determined based on the capacity of the capacitor in the secondary filtering unit. For example, based on the capacity of the capacitor in the secondary filtering unit to determine that the secondary filter unit can withstand a maximum load current of 500 mA or 1 A, the target current can be set to 500 mA or 1 A, thereby preventing the output current of the second adapter from exceeding Charging failure caused by the target current.

Optionally, in some embodiments, the second adapter 10 supports a second charging mode (ie, the second adapter 10 is operable to charge the device to be charged (eg, a terminal) in the second charging mode), and second The charging mode is constant current mode. In the constant current mode, the target voltage is the maximum voltage that the second adapter 10 is allowed to output in the constant current mode, and the target current is the current corresponding to the constant current mode. The power adjustment unit 14 is specifically configured to adjust the output current of the second adapter 10 to the current corresponding to the constant current mode according to the current feedback signal, and when the voltage feedback signal indicates that the output voltage of the second adapter 10 reaches the constant current of the second adapter 10 When the maximum voltage allowed in the mode is allowed, the output voltage of the second adapter 10 is controlled not to exceed the maximum voltage that the second adapter 10 is allowed to output in the constant current mode.

In the embodiment of the present invention, the target current is set to a current corresponding to the constant current mode, and the target voltage is set to a maximum voltage allowed by the second adapter in the constant current mode, so that the second adapter can quickly be the second based on the current feedback loop. The output current of the adapter is adjusted to the current corresponding to the constant current mode to charge the device to be charged (such as the terminal). In the charging process, once the output voltage of the second adapter reaches the maximum voltage allowed by the second adapter, the second adapter The voltage feedback loop can sense the situation in time, and prevent the output voltage of the second adapter from rising further in time, thereby avoiding the occurrence of charging failure.

Optionally, as shown in FIG. 2, the second adapter 10 may further include a first adjusting unit 21 on the basis of any of the above embodiments. The first adjusting unit 21 is connected to the voltage feedback unit 12, and the first adjusting unit 21 can be used to adjust the value of the target voltage.

The embodiment of the present invention introduces a first adjusting unit, which can adjust the output voltage of the second adapter according to actual needs, thereby improving the intelligence level of the second adapter. For example, the second adapter 10 can operate in the first charging mode or the second charging mode, and the first adjusting unit 21 can correspondingly adjust the target voltage based on the first charging mode or the second charging mode currently used by the second adapter 10. The value.

Optionally, on the basis of the embodiment of FIG. 2, as shown in FIG. 3, the voltage feedback unit 12 may include a voltage sampling unit 31 and a voltage comparison unit 32. The input end of the voltage sampling unit 31 is connected to the power conversion unit 11 for sampling the output voltage of the second adapter 10 to obtain a first voltage. The input of the voltage comparison unit 32 is connected to the output of the voltage sampling unit 31. The voltage comparison unit 32 is configured to compare the first voltage and a first reference voltage, and generate a voltage feedback signal based on a comparison result between the first voltage and a first reference voltage. The first adjusting unit 21 is connected to the voltage comparing unit 32 to provide a first reference voltage for the voltage comparing unit 32. The first adjusting unit 21 can achieve the purpose of adjusting the value of the target voltage by adjusting the value of the first reference voltage.

It should be understood that the first voltage in the embodiment of the invention corresponds to the output voltage of the second adapter, or the first voltage is used to indicate the magnitude of the current output voltage of the second adapter. In addition, the first reference voltage in the embodiment of the present invention corresponds to the target voltage, or the first reference voltage is used to indicate the magnitude of the target voltage.

In some embodiments, when the first voltage is less than the first reference voltage, the voltage comparison unit generates a first voltage feedback signal, the first voltage feedback signal is used to indicate that the output voltage of the second adapter has not reached the target voltage; When the first voltage is equal to the first reference voltage, the voltage comparison unit generates a second voltage feedback signal, and the second voltage feedback signal is used to indicate that the output voltage of the second adapter reaches the target voltage.

The embodiment of the present invention does not limit the specific form of the voltage sampling unit 31. For example, the voltage sampling unit 31 can be a wire. In this case, the first voltage is the output voltage of the second adapter, and the first reference voltage is the target voltage. For example, the voltage sampling unit 31 may include two resistors that perform series voltage division. In this case, the first voltage may be a voltage obtained by dividing the two resistors, and the value of the first reference voltage is equal to the two resistors. The voltage division ratio is related. Take the target voltage equal to 5V as an example. If the output voltage of the second adapter reaches 5V, after the series voltage division of the two resistors, the first voltage is 0.5V, the first reference voltage can be set to 0.5V. .

The manner in which the first adjustment unit 21 in the embodiment of FIG. 3 adjusts the first reference voltage may be various, and will be described in detail below with reference to FIGS. 4 to 6.

Optionally, in some embodiments, as shown in FIG. 4, the first adjusting unit 21 may include a control unit 41 and a first digital to analog converter (DAC) 42. The input of the first DAC 42 is connected to the control unit 41, and the output of the first DAC 42 is connected to the voltage comparison unit 32. The control unit 41 achieves the purpose of adjusting the value of the first reference voltage through the first DAC 42.

Specifically, the control unit 41 may be an MCU, and the MCU may be connected to the first DAC 42 through the DAC. The MCU outputs a digital signal through the DAC, and converts the digital signal into an analog signal through the first DAC 42. The analog signal is the first signal. The voltage value of a reference voltage. The DAC has the characteristics of fast signal conversion speed and high precision. Adjusting the reference voltage through the DAC can improve the adjustment speed and control precision of the reference voltage by the second adapter.

Optionally, in some embodiments, as shown in FIG. 5, the first adjusting unit 21 may include a control unit 51 and an RC filtering unit 52. The input of the RC filter unit 52 is connected to the control unit 51, and the output of the RC filter unit 52 is connected to the voltage comparison unit 32. The control unit 51 is configured to generate a PWM signal, and adjust the value of the first reference voltage by adjusting the duty ratio of the PWM signal.

Specifically, the control unit 51 may be an MCU, and the MCU may output a PWM signal through the PWM port. After the PWM signal is filtered by the RC filter circuit 52, a stable analog quantity, that is, a first reference voltage, may be formed. The RC filter circuit 52 has the characteristics of simple implementation and low price, and can realize adjustment of the first reference voltage at a low cost.

Optionally, in some embodiments, as shown in FIG. 6, the first adjusting unit 21 may include a control unit 61 and a digital potentiometer 62. The control terminal of the digital potentiometer 62 is connected to the control unit 61, and the output of the digital potentiometer 62 is connected to the voltage comparison unit 32. The control unit 61 adjusts the value of the first reference voltage by adjusting the voltage division ratio of the digital potentiometer 62.

Specifically, the control unit 61 may be an MCU, and the MCU may be connected to the control end of the digital potentiometer 62 through an Inter Integrated Circuit (I2C) interface for adjusting the voltage dividing ratio and the digital potential of the digital potentiometer 62. The high potential terminal of the device 62 can be VDD, that is, the power supply terminal, and the low potential terminal of the digital potentiometer 62 can be connected to the ground. The output terminal (or the regulation output terminal) of the digital potentiometer 62 is connected to the voltage comparison unit 32 for The first reference voltage is output to the voltage comparison unit 32. The digital potentiometer is simple to implement and inexpensive, and can realize the adjustment of the first reference voltage at a low cost.

Optionally, on the basis of the embodiment of FIG. 2, as shown in FIG. 7, the voltage feedback unit 12 may include a voltage dividing unit 71 and a voltage comparison unit 72. The input end of the voltage dividing unit 71 is connected to the power conversion unit 11 for dividing the output voltage of the second adapter 10 according to the set voltage dividing ratio to generate a first voltage. The input end of the voltage comparison unit 72 is connected to the output end of the voltage dividing unit 71 for comparing the first voltage and a first reference voltage, and generating a voltage feedback signal based on the comparison result of the first voltage and a first reference voltage. . The first adjusting unit 21 is connected to the voltage dividing unit 71, and adjusts the voltage value of the target voltage by adjusting the voltage dividing ratio of the voltage dividing unit 71.

The main difference between the embodiment of FIG. 7 and the embodiment of FIG. 3 to FIG. 6 is that the embodiment of FIGS. 3 to 6 realizes the adjustment of the voltage value of the target voltage by adjusting the reference voltage of the voltage comparison unit, 7th. The embodiment of the figure is to adjust the voltage value of the target voltage by adjusting the voltage division ratio of the voltage dividing unit 71. In other words, in the embodiment of FIG. 7, the first reference voltage can be set to a fixed value V _REF , and if the output voltage of the second adapter is desired to be 5 V, the voltage dividing ratio of the voltage dividing unit 71 can be adjusted so that the second When the output voltage of the adapter is 5V, the voltage at the output of the voltage dividing unit 71 is equal to V _REF ; similarly, if the output voltage of the second adapter is desired to be 3V, the voltage dividing ratio of the voltage dividing unit 71 can be adjusted to make the second When the output voltage of the adapter is 3V, the voltage at the output of the voltage dividing unit 71 is equal to V _REF .

In the embodiment of the invention, the sampling of the output voltage of the second adapter and the adjustment of the voltage value of the target voltage are realized by the voltage dividing unit, which simplifies the circuit structure of the second adapter.

The voltage dividing unit 71 of the embodiment of the present invention can be implemented in various manners. For example, the voltage potentiometer can be implemented by using a digital potentiometer, or the functions of the voltage dividing and voltage dividing ratio adjustment can be realized by discrete resistors, switches, and the like.

Taking the implementation of the digital potentiometer as an example, as shown in FIG. 8, the voltage dividing unit 71 may include a digital potentiometer 81. The first adjustment unit 21 can include a control unit 82. The high potential end of the digital potentiometer 81 is connected to the power conversion unit 11, and the low potential end of the digital potentiometer 81 is connected to the ground. The output of the digital potentiometer 81 is connected to the input of the voltage comparison unit 72. The control unit 82 is connected to the control terminal of the digital potentiometer 81 for adjusting the voltage division ratio of the digital potentiometer 81.

The voltage comparison unit 72 is implemented in various manners. In some embodiments, as shown in FIG. 9, the voltage comparison unit 72 may include a first operational amplifier. The inverting input of the first operational amplifier is configured to receive the first voltage, the non-inverting input of the first operational amplifier is configured to receive the first reference voltage, and the output of the first operational amplifier is used to generate a voltage feedback signal. The first op amp can also be referred to as a first error amplifier, or a voltage error amplifier.

Optionally, as shown in FIG. 10, on the basis of any of the foregoing embodiments, the second adapter 10 may further include a second adjusting unit 101, and the second adjusting unit 101 is connected to the current feedback unit 13 for adjustment. The current value of the target current.

The embodiment of the invention introduces a second adjusting unit, which can adjust the output current of the second adapter according to actual needs, and improves the intelligence of the second adapter. For example, the second adapter 10 can operate in the first charging mode or the second charging mode, and the second adjusting unit 101 adjusts the current value of the target current based on the first charging mode or the second charging mode currently used by the second adapter 10. .

Optionally, in some embodiments, on the basis of the embodiment of FIG. 10, as shown in FIG. 11, the current feedback unit 13 may include a current sampling unit 111 and a current comparison unit 112. The input end of the current sampling unit 111 is connected to the power conversion unit 11 for sampling the output current of the second adapter 10 to obtain a second voltage for indicating the magnitude of the output current of the second adapter 10. The input end of the current comparison unit 112 is connected to the output end of the current sampling unit 111 for comparing the second voltage and a second reference voltage, and generating a current feedback based on a comparison result of a second voltage and a second reference voltage. Signal. The second adjusting unit 101 is connected to the current comparing unit 112, supplies a second reference voltage to the current comparing unit 112, and adjusts the current value of the target current by adjusting the voltage value of the second reference voltage.

It should be understood that the second voltage in the embodiment of the invention corresponds to the output current of the second adapter, or the second voltage is used to indicate the magnitude of the output current of the second adapter. In addition, the second reference voltage in the embodiment of the present invention corresponds to the target current, or the second reference voltage is used to indicate the magnitude of the target current.

Specifically, when the second voltage is less than the second reference voltage, the current comparison unit generates a first current feedback signal, the first current feedback signal is used to indicate that the output current of the second adapter has not reached the target current; When the second reference voltage is equal to the second reference voltage, the current comparison unit generates a second current feedback signal, and the second current feedback signal is used to indicate that the output current of the second adapter reaches the target current.

Specifically, the current sampling unit 111 obtains a second voltage. The current sampling unit 111 first samples the output current of the second adapter to obtain a sampling current. Then, according to the magnitude of the sampling current, it is converted into a corresponding sampling voltage (the sampling voltage value is equal to the product of the sampling current value and the sampling resistance). In some embodiments, the sampled voltage can be directly used as the second voltage. In other embodiments, the sampled voltage may be divided by a complex resistor, and the divided voltage is used as the second voltage. The current sampling function in the current sampling unit 111 can be specifically implemented by a galvanometer.

The manner in which the second adjustment unit in the embodiment of FIG. 11 adjusts the second reference voltage may be various, and is described in detail below with reference to FIGS. 12 to 14.

Optionally, in some embodiments, as shown in FIG. 12, the second adjusting unit 101 may include a control unit 121 and a second DAC 122. The input of the second DAC 122 is coupled to the control unit 121, and the output of the second DAC 122 is coupled to the current comparison unit 112. The control unit 121 adjusts the voltage value of the second reference voltage through the second DAC 122.

Specifically, the control unit 121 may be an MCU. The MCU can be connected to the second DAC 122 through the DAC. The MCU outputs a digital signal through the DAC and converts the digital signal into an analog signal through the second DAC 122. The analog signal is the voltage value of the first reference voltage. The DAC has the characteristics of fast signal conversion speed and high precision. Adjusting the reference voltage through the DAC can improve the adjustment speed and control precision of the reference voltage by the second adapter.

Optionally, in some embodiments, as shown in FIG. 13, the second adjusting unit 101 may include a control unit 131 and an RC filtering unit 132. The input of the RC filter unit 132 is connected to the control unit 131, and the output of the RC filter unit 132 is connected to the current comparison unit 112. The control unit 131 is configured to generate a PWM signal, and adjust a voltage value of the second reference voltage by adjusting a duty ratio of the PWM signal.

Specifically, the control unit 131 may be an MCU. The MCU can output PWM signals through PWM埠. After the PWM signal is filtered by the RC filter circuit 132, a stable analog quantity, that is, a second reference voltage, can be formed. The RC filter circuit 132 has the characteristics of simple implementation and low price, and can realize adjustment of the second reference voltage at a low cost.

Optionally, in some embodiments, as shown in FIG. 14, the second adjusting unit 101 may include a control unit 141 and a digital potentiometer 142. The control terminal of the digital potentiometer 142 is connected to the control unit 141, and the output of the digital potentiometer 142 is connected to the current comparison unit 112. The control unit 141 adjusts the voltage value of the second reference voltage by adjusting the voltage division ratio of the digital potentiometer 142.

In some embodiments, control unit 141 can be an MCU. The MCU can be connected to the control terminal of the digital potentiometer 142 through the I2C interface for adjusting the voltage division ratio of the digital potentiometer 142. The high potential end of the digital potentiometer 142 can be VDD, that is, the power supply terminal, and the low potential end of the digital potentiometer 142 can be connected to the ground. An output terminal (or a regulated output terminal) of the digital potentiometer 142 is connected to the current comparison unit 112 for outputting a second reference voltage to the current comparison unit 112. The digital potentiometer is simple to implement and inexpensive, and can adjust the second reference voltage at a lower cost.

Optionally, in some embodiments, on the basis of the embodiment of FIG. 10, as shown in FIG. 15, the current feedback unit 13 may include a current sampling unit 151, a voltage dividing unit 152, and a current comparison unit 153. The input end of the current sampling unit 151 is connected to the power conversion unit 11 for sampling the output current of the second adapter 10 to obtain a third voltage. The third voltage is used to indicate the magnitude of the output current of the second adapter 10. The input end of the voltage dividing unit 152 is connected to the output end of the current sampling unit 151 for dividing the third voltage according to the set voltage dividing ratio to generate a second voltage. The input end of the current comparison unit 153 is connected to the output end of the voltage dividing unit 152 for comparing the second voltage and a second reference voltage, and generating a current feedback based on a comparison result of a second voltage and a second reference voltage. Signal. The second adjusting unit 101 is connected to the voltage dividing unit 152, and adjusts the current value of the target current by adjusting the voltage dividing ratio of the voltage dividing unit 152.

The main difference between the embodiment of FIG. 15 and the embodiment of FIGS. 11 to 14 is that the embodiment of FIGS. 11 to 14 realizes the adjustment of the current value of the target current by adjusting the reference voltage of the current comparison unit, the fifteenth The embodiment of the figure is to adjust the current value of the target current by adjusting the voltage division ratio of the voltage dividing unit 152. In other words, in the embodiment of Fig. 15, the second reference voltage can be set to a fixed value V _REF , and if the output current of the second adapter is desired to be 300 mV, the voltage dividing ratio of the voltage dividing unit 152 can be adjusted so that the second When the output current of the adapter is 300mV, the voltage at the output of the voltage dividing unit 152 is equal to V _REF ; similarly, if the output current of the second adapter is desired to be 500mV, the voltage dividing ratio of the voltage dividing unit 152 can be adjusted to make the second When the output current of the adapter is 500 mV, the voltage at the output of the voltage dividing unit 152 is equal to V _REF .

The voltage dividing unit 152 of the embodiment of the present invention can be implemented in various manners. For example, the voltage potentiometer can be implemented by using a digital potentiometer, or the functions of the voltage dividing and voltage dividing ratio adjustment can be realized by discrete resistors, switches, and the like.

Taking the implementation of the digital potentiometer as an example, as shown in FIG. 16, the voltage dividing unit 152 includes a digital potentiometer 161, and the second adjusting unit 101 includes a control unit 162. The high potential end of the digital potentiometer 161 is connected to the output terminal of the current sampling unit 151, the low potential end of the digital potentiometer 161 is connected to the ground, and the output terminal of the digital potentiometer 161 is connected to the input terminal of the current comparison unit 153. The control unit 162 is connected to the control terminal of the digital potentiometer 161 for adjusting the voltage dividing ratio of the digital potentiometer 161.

The control unit above may be a control unit or a complex control unit. In some embodiments, the control unit in the first adjustment unit and the second adjustment unit is the same control unit.

The current comparison unit 153 is implemented in various manners. In some embodiments, as shown in FIG. 17, the current comparison unit 153 may include a second operational amplifier. The inverting input of the second op amp is for receiving the second voltage, the non-inverting input of the second op amp is for receiving the second reference voltage, and the output of the second op amp is for generating a current feedback signal. The second op amp can also be referred to as a second error amplifier, or a current error amplifier.

The implementation of the voltage feedback unit 12 and the current feedback unit 13 and the target voltage corresponding to the voltage feedback unit 12 and the target current corresponding to the current feedback unit 13 are described in detail above with reference to FIGS. 1 to 17 . Figure 18 details the implementation of the power adjustment unit 14.

Optionally, in some embodiments, as shown in FIG. 18, the voltage feedback unit 12 may include a first operational amplifier (not shown in FIG. 18, specifically see FIG. 9), and the voltage feedback unit 12 The output of an op amp is used to output a voltage feedback signal. The current feedback unit 13 can include a second operational amplifier (not shown in FIG. 18, specifically referring to FIG. 17). The output of the second operational amplifier of the current feedback unit 13 is used to output a current feedback signal. The power adjustment unit 14 can include a first diode D1, a second diode D2, a photocoupling unit 181, and a PWM control unit 182. The output of the first operational amplifier of the voltage feedback unit 12 (see FIG. 9, the output of the first operational amplifier for the output voltage feedback signal) is connected to the negative terminal of the first diode D1. The anode of the first diode D1 is connected to the input terminal of the photo-coupling unit 181. The output of the second operational amplifier of the current feedback unit 13 (see Fig. 17, the output of the second operational amplifier is used for the output current feedback signal) is connected to the negative terminal of the second diode D2. The anode of the second diode D2 is connected to the input terminal of the photo-coupling unit 181. The output of the photo-coupling unit 181 is connected to the input of the PWM control unit 182. The output of the PWM control unit 182 is connected to the power conversion unit 11.

It should be understood that the first op amp appearing herein may refer to the same op amp. Similarly, the second op amp that appears in this article can refer to the same op amp.

Specifically, in this embodiment, the voltage signal output by the first operational amplifier is a voltage feedback signal, and the voltage signal output by the second operational amplifier is a current feedback signal, and the voltage signal output by the first operational amplifier is 0 indicating a second The output voltage of the adapter reaches the target voltage, and the voltage signal output by the second op amp is 0 indicating that the output current of the second adapter reaches the target current. The first diode D1 and the second diode D2 are two anti-parallel diodes. When the voltage signal output by any one of the first operational amplifier and the second operational amplifier is 0, the 18th The voltage at the feedback point in the figure is about 0 (the actual voltage of the feedback point will be slightly larger than 0, as it can be 0.7V) because the diode is required to conduct a certain voltage difference. In this case, the photo-coupling unit 181 operates in a steady state, and outputs a stable voltage signal to the PWM control unit 182. Then, the PWM control unit 182 generates a PWM control signal having a constant duty ratio, and stabilizes the output voltage and the output current of the second adapter through the power conversion unit 11. In other words, when any one of the output voltage and the output current of the second adapter reaches the target value, the first diode D1 and the second diode D2 in anti-parallel can immediately sense the occurrence of the event, and further The output voltage and output current of the second adapter are stabilized.

Optionally, in some embodiments, the second adapter 10 can support a first charging mode and a second charging mode, and the second adapter 10 charges the charging device (such as a terminal) in the second charging mode. Faster than the charging speed of the second adapter 10 to a device to be charged (such as a terminal) in the first charging mode. In other words, compared to the second adapter 10 operating in the first charging mode, the second adapter 10 operating in the second charging mode is filled with the battery in the same capacity of the device to be charged (such as the terminal). It is shorter.

The second adapter 10 includes a control unit. In the program in which the second adapter 10 is connected to a device to be charged (such as a terminal), the control unit performs bidirectional communication with the device to be charged (such as a terminal) to control the charging procedure of the second charging mode. . The control unit may be the control unit in any of the above embodiments, such as a control unit in the first adjustment unit or a control unit in the second adjustment unit.

The first charging mode may be a normal charging mode, and the second charging mode may be a fast charging mode. The normal charging mode means that the second adapter outputs a relatively small current value (typically less than 2.5 A) or a relatively small power (typically less than 15 W) to charge the battery in the charging device (eg, the terminal). In the charging mode, it is usually necessary to fully charge a large capacity battery (such as a battery with a capacity of 3000 mAh), which usually takes several hours; in the fast charging mode, the second adapter can output a relatively large amount. Current (usually greater than 2.5A, such as 4.5A, 5A or higher) or relatively large power (typically greater than or equal to 15W) to charge the battery in a charging device (such as a terminal) compared to normal charging mode In other words, the charging time required for the second adapter to fully charge the same capacity battery in the fast charging mode can be significantly shortened and the charging speed is faster.

The embodiment of the present invention does not specifically limit the communication content of the control unit of the second adapter and the device to be charged (such as the terminal), and the control mode of the output of the second adapter in the second charging mode. For example, the control unit may Communicate with a device to be charged (such as a terminal), interact with the current voltage or current power of the battery in the device to be charged (such as a terminal), and adjust the output voltage or output current of the second adapter based on the current voltage or current power of the battery. The communication content between the control unit and the device to be charged (such as the terminal) and the control mode of the control unit for the output of the second adapter in the second charging mode will be described in detail below in conjunction with a specific embodiment.

Optionally, in some embodiments, the program that the control unit performs bidirectional communication with the device to be charged (eg, the terminal) to control the output of the second adapter in the second charging mode may include: the control unit and the device to be charged ( For example, the terminal performs two-way communication to negotiate a charging mode between the second adapter and a device to be charged (such as a terminal).

In the embodiment of the present invention, the second adapter does not blindly use the second charging mode to quickly charge the charging device (such as the terminal), but performs two-way communication with the device to be charged (such as the terminal), and negotiates whether the second adapter can adopt the first The second charging mode performs fast charging on a charging device (such as a terminal), which can improve the safety of the charging program.

Specifically, the two-way communication between the control unit and the device to be charged (such as the terminal) to negotiate the charging mode between the second adapter and the device to be charged (such as the terminal) may include: the control unit sends a charging device (such as a terminal) to the device to be charged. a first instruction, the first instruction is used to ask whether a device to be charged (such as a terminal) turns on the second charging mode; the control unit receives a reply command sent by the device to be charged (such as a terminal) for the first instruction, and the reply command is used to indicate Whether the device to be charged (such as a terminal) agrees to turn on the second charging mode; in the case that the device to be charged (such as a terminal) agrees to turn on the second charging mode, the control unit uses the second charging mode to charge the device to be charged (such as a terminal).

The above description of the embodiments of the present invention does not limit the master-slave of the second adapter (or the control unit of the second adapter) and the device to be charged (such as the terminal), in other words, the control unit and the device to be charged (eg, Any one of the terminals may initiate a two-way communication session as the master device, and accordingly the other party may make a first response or a first reply as the slave device initiates communication to the master device. As a possible way, the identity of the master and slave devices can be confirmed in the communication program by comparing the potential level of the potential of the second adapter side and the device to be charged (such as the terminal) relative to the ground.

The embodiment of the present invention does not limit the specific implementation of the two-way communication between the second adapter (or the control unit of the second adapter) and the device to be charged (such as the terminal), that is, the second adapter (or the second adapter) The control unit) initiates a communication session with any one of the devices to be charged (eg, the terminal) as the master device, and accordingly the other party acts as the first response or the first reply to the communication session initiated by the slave device to the master device. The master device can make a second response to the first response or the first reply of the slave device, that is, the negotiation procedure of the one charging mode is completed between the master and the slave device. As a feasible implementation manner, after the negotiation between the master and slave devices is completed, the charging operation between the master and slave devices can be performed to ensure the safe and reliable charging procedure after the negotiation. carried out.

One way that the master device can make a second response according to the slave device's first response or first reply to the communication session may be that the master device can receive the slave device's first response to the communication session. A response or a first reply, and making a targeted second response based on the received first response or first reply of the slave device. For example, when the master device receives the first response or the first reply of the slave device for the communication session within a preset time, the master device may make a response to the first response or the first response of the slave device. The second response is specifically: the master device and the slave device complete the negotiation of the charging mode, and the charging operation is performed between the master device and the slave device according to the negotiation result according to the first charging mode or the second charging mode, that is, The second adapter operates to charge the device to be charged (eg, the terminal) in the first charging mode or the second charging mode according to the negotiation result.

As a way for the master device to make a further second response according to the first response or the first reply of the slave device for the communication session, the master device may not receive the slave device within a preset time. For the first response or the first reply of the communication session, the master device also makes a targeted second response to the first response or the first reply of the slave device. For example, when the master device does not receive the first response or the first reply of the slave device for the communication session within a preset time, the master device also performs the first response or the first reply of the slave device. The targeted second response is specifically: the master device side and the slave device side complete the negotiation of one charging mode, and the charging operation is performed between the master device side and the slave device side according to the first charging mode, that is, the second adapter works in the first Charging a device to be charged (such as a terminal) in a charging mode.

Optionally, in some embodiments, when a device to be charged (such as a terminal) initiates a communication session as a master device, the second adapter (or the control unit of the second adapter) acts as a communication session initiated by the slave device to the master device side. After the first response or the first reply, the second adapter (or the second adapter) can be considered as no need to make a targeted second response to the first response or the first response of the second adapter by the charging device (such as the terminal). The control unit) completes a negotiation procedure of the charging mode with the device to be charged (such as the terminal), and the second adapter can determine, according to the negotiation result, the device to be charged (such as the terminal) in the first charging mode or the second charging mode. Charge it.

Optionally, in some embodiments, the program for bidirectional communication between the control unit and the device to be charged (eg, the terminal) to control the output of the second adapter in the second charging mode may include: the control unit and the device to be charged (eg, The terminal performs bidirectional communication to determine a charging voltage for charging the device to be charged (such as a terminal) output by the second adapter in the second charging mode; and the control unit adjusts the voltage value of the target voltage to make the target voltage The voltage value is equal to the charging voltage output by the second adapter in the second charging mode for charging the device to be charged, such as a terminal.

Specifically, the control unit performs bidirectional communication with the device to be charged (eg, the terminal) to determine that the charging voltage for charging the device to be charged (eg, the terminal) output by the second adapter in the second charging mode may include: the control unit Sending a second command to the device to be charged (such as the terminal) for inquiring whether the output voltage of the second adapter matches the current voltage of the battery of the device to be charged (such as the terminal); the control unit receives the device to be charged (eg The terminal sends a reply command of a second instruction, and the reply instruction of the second instruction is used to indicate that the output voltage of the second adapter matches the current voltage of the battery, and is higher or lower. Alternatively, the second instruction may be used to query whether the current output voltage of the second adapter is suitable as the charging voltage for charging the device to be charged (eg, the terminal) as the second adapter output in the second charging mode, second The command's reply command can be used to indicate that the current second adapter's output voltage is appropriate, high or low. The current output voltage of the second adapter matches the current voltage of the battery, or the current output voltage of the second adapter is suitable as the charging voltage for charging the device to be charged (eg, the terminal) as the second adapter output in the second charging mode It can be said that the current output voltage of the second adapter is slightly higher than the current voltage of the battery, and the difference between the output voltage of the second adapter and the current voltage of the battery is within a preset range (usually on the order of several hundred millivolts) .

Optionally, in some embodiments, the two-way communication between the control unit and the device to be charged (such as the terminal) to control the output of the second adapter in the second charging mode may include: the control unit and the device to be charged (eg, The terminal performs bidirectional communication to determine a charging current output by the second adapter in the second charging mode for charging the charging device (eg, the terminal); and the control unit adjusts the current value of the target current to make the target current The current value is equal to the charging current output by the second adapter in the second charging mode for charging the device to be charged (eg, the terminal).

Specifically, the control unit performs bidirectional communication with the device to be charged (eg, the terminal) to determine that the charging current for charging the device to be charged (eg, the terminal) output by the second adapter in the second charging mode may include: the control unit Sending a third command to the device to be charged (such as the terminal), the third command is used to query the maximum charging current currently supported by the device to be charged (such as the terminal); and the control unit receives a third command sent by the device to be charged (such as the terminal) The reply command of the third instruction is used to indicate the maximum charging current currently supported by the device to be charged (such as the terminal); the control unit determines the second charging mode according to the maximum charging current currently supported by the device to be charged (such as the terminal). The second adapter outputs a charging current for charging a charging device such as a terminal. It should be understood that the control unit determines, according to the maximum charging current currently supported by the device to be charged (such as the terminal), the charging current for charging the device to be charged (such as the terminal) output by the second adapter in the second charging mode. For example, the second adapter may determine the maximum charging current currently supported by the device to be charged (eg, the terminal) as the charging current for charging the device to be charged (eg, the terminal) output by the second adapter in the second charging mode, It is also possible to determine the maximum charging current currently supported by the device to be charged (such as the terminal) and the current output capability of the device, and determine the output of the second adapter in the second charging mode for the device to be charged (eg, the terminal). Charging current.

Optionally, in some embodiments, the program that the control unit performs bidirectional communication with the device to be charged (eg, the terminal) to control the output of the second adapter in the second charging mode may include: using the second in the second adapter In the charging mode for charging a device to be charged (such as a terminal), the control unit performs bidirectional communication with the device to be charged (such as a terminal) to adjust the output current of the second adapter in the second charging mode.

Specifically, the two-way communication between the control unit and the device to be charged (such as the terminal) to adjust the output current of the second adapter may include: the control unit sends a fourth command to the device to be charged (such as the terminal), and the fourth command is used to query The current voltage of the battery of the device to be charged (such as the terminal); the control unit receives a reply command of a fourth command sent by the second adapter, the reply command of the fourth command is used to indicate the current voltage of the battery; and the control unit is based on the current voltage of the battery , adjust the output current of the second adapter.

Optionally, in some embodiments, as shown in FIG. 19A, the second adapter 10 includes a charging interface 191. Further, in some embodiments, the control unit in the second adapter 10 (such as the MCU in FIG. 23) can communicate bidirectionally with the device to be charged (such as a terminal) through the data line 192 in the charging interface 191.

Optionally, in some embodiments, the program for bidirectional communication between the control unit and the device to be charged (eg, the terminal) to control the output of the second adapter in the second charging mode may include: the control unit and the device to be charged (eg, The terminal) performs two-way communication to determine whether the charging interface is in poor contact.

Specifically, the two-way communication between the control unit and the device to be charged (such as the terminal) to determine whether the charging interface is in poor contact may include: the control unit sends a fourth command to the device to be charged (such as the terminal), and the fourth command is used to query The current voltage of the battery of the charging device (such as the terminal); the control unit receives a reply command of a fourth command sent by the device to be charged (such as the terminal), and the reply command of the fourth command is used to indicate the battery of the device to be charged (such as the terminal) The current voltage; the control unit determines whether the charging interface is in poor contact according to the output voltage of the second adapter and the current voltage of the battery of the device to be charged (eg, the terminal). For example, the control unit determines that the voltage difference between the output voltage of the second adapter and the current voltage of the device to be charged (eg, the terminal) is greater than a preset voltage threshold, indicating that the voltage difference is divided by the current current value output by the second adapter. The obtained impedance is greater than the preset impedance threshold to determine the poor contact of the charging interface.

Optionally, in some embodiments, the charging interface contact failure may also be determined by a device to be charged (such as a terminal): the device to be charged (such as a terminal) sends a sixth command to the control unit, and the sixth command is used to query the second adapter. Output voltage; the device to be charged (such as a terminal) receives the reply command of the sixth command sent by the control unit, the reply command of the sixth command is used to indicate the output voltage of the second adapter; the device to be charged (such as the terminal) according to the device to be charged (such as the terminal) the current voltage of the battery and the output voltage of a second adapter to determine whether the charging interface is in poor contact. After the charging device (such as the terminal) determines that the charging interface is in poor contact, the device to be charged (such as the terminal) sends a fifth command to the control unit, and the fifth command is used to indicate that the charging interface is in poor contact. After receiving the fifth instruction, the control unit may control the second adapter to exit the second charging mode.

The communication procedure between the control unit in the second adapter and the device to be charged (e.g., terminal) will be described in more detail below in conjunction with FIG. 19B. It should be noted that the example of FIG. 19B is merely for the purpose of facilitating the understanding of the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to the specific numerical values or specific examples illustrated. A person skilled in the art will be able to make various modifications or changes in the form of the embodiment of FIG. 19B, and such modifications or variations are also within the scope of the embodiments of the present invention.

As shown in FIG. 19B, in the second charging mode, the charging process of the second adapter to the charging device (such as the terminal), that is, the charging procedure, may include five phases: Phase 1: To-be-charged device (such as terminal) and power supply After the device is connected, the device to be charged (such as a terminal) can detect the type of the power supply device through the data lines D+ and D-, and when the power supply device is detected as the second adapter, the current to be absorbed by the device to be charged (such as the terminal) It may be greater than a preset current threshold I2 (for example, may be 1A). When the control unit in the second adapter detects that the output current of the second adapter is greater than or equal to I2 within a preset duration (eg, may be continuous T1 time), the control unit may consider the device to be charged (eg, the terminal) to be powered The type identification of the providing device has been completed, the control unit opens a negotiation procedure between the second adapter and the device to be charged (such as the terminal), and sends an instruction 1 (corresponding to the first instruction) to the device to be charged (such as the terminal) to inquire Whether the device to be charged (such as a terminal) agrees to charge the second adapter in a second charging mode to charge the device (such as a terminal).

When the control unit receives the reply command of the instruction 1 sent by the device to be charged (such as the terminal), and the reply command of the command 1 indicates that the device to be charged (such as the terminal) does not agree with the second adapter to treat the device in the second charging mode (such as When the terminal is charging, the control unit detects the output current of the second adapter again. When the output current of the second adapter is still greater than or equal to I2 within a preset continuous time period (for example, may be continuous T1 time), the control unit again sends an instruction 1 to the device to be charged (such as the terminal) to inquire about the device to be charged. Whether the terminal, for example, the terminal, agrees to charge the charging device (e.g., terminal) in the second charging mode. The control unit repeats the above steps of phase 1 until the device to be charged (such as the terminal) agrees that the second adapter charges the device to be charged (such as the terminal) in the second charging mode, or the output current of the second adapter no longer satisfies greater than or equal to I2 conditions of.

When the device to be charged (such as a terminal) agrees that the second adapter charges the charging device (such as a terminal) in the second charging mode, the communication flow enters the second stage.

Phase 2: The output voltage of the second adapter can include a plurality of gears. The control unit sends an instruction 2 (corresponding to the second instruction) to the device to be charged (such as the terminal) to inquire whether the output voltage of the second adapter (current output voltage) matches the current voltage of the battery of the device to be charged (such as the terminal) .

The device to be charged (such as a terminal) sends a reply command of the instruction 2 to the control unit to indicate that the output voltage of the second adapter matches the current voltage of the battery of the device to be charged (such as the terminal), is high or low. If the reply command for the instruction 2 indicates that the output voltage of the second adapter is high or low, the control unit may adjust the output voltage of the second adapter to a grid position and send the instruction 2 to the device to be charged (such as the terminal) again. Re-inquiring whether the output voltage of the second adapter matches the current voltage of the battery to be charged (such as the terminal). The above steps of phase 2 are repeated until the device to be charged (e.g., the terminal) determines that the output voltage of the second adapter matches the current voltage of the battery of the device to be charged (e.g., the terminal), and proceeds to the third stage.

Stage 3: The control unit sends an instruction 3 (corresponding to the above-mentioned third instruction) to the device to be charged (such as the terminal), and queries the maximum charging current currently supported by the device to be charged (such as the terminal). The device to be charged (such as a terminal) sends a reply command of instruction 3 to the control unit to indicate the maximum charging current currently supported by the device to be charged (such as the terminal), and enters the fourth stage.

Stage 4: The control unit determines, according to the maximum charging current currently supported by the device to be charged (such as the terminal), the charging current for charging the device to be charged (such as the terminal) output by the second adapter in the second charging mode, and then enters the stage. 5, that is, the constant current charging phase.

Stage 5: After entering the constant current charging phase, the control unit may send an instruction 4 (corresponding to the fourth instruction) to the device to be charged (such as the terminal) at intervals, and query the current voltage of the battery of the device to be charged (such as the terminal). . The device to be charged (such as a terminal) can send a reply command of instruction 4 to the control unit to feed back the current voltage of the battery of the device to be charged (such as the terminal). The control unit can determine whether the contact of the charging interface is good according to the current voltage of the battery of the device to be charged (such as the terminal), and whether it is necessary to reduce the output current of the second adapter. When the second adapter determines that the charging interface is in poor contact, the instruction 5 (corresponding to the fifth instruction) may be sent to the device to be charged (such as the terminal), the second adapter will exit the second charging mode, and then reset and re-enter the phase 1. .

Optionally, in some embodiments, in the phase 1, when the device to be charged (such as a terminal) sends the reply command of the instruction 1, the reply command of the command 1 may carry the path impedance of the device to be charged (such as the terminal). Information (or information). The path impedance data of the device to be charged (e.g., the terminal) can be used to determine if the contact of the charging interface is good at stage 5.

Optionally, in some embodiments, in phase 2, the device to be charged (such as a terminal) agrees that the second adapter charges a device to be charged (such as a terminal) in the second charging mode to the control unit to be the second The time it takes for the adapter's output voltage to adjust to the proper charging voltage can be controlled within a certain range. If the time is outside the predetermined range, the second adapter or the device to be charged (such as the terminal) can determine that the fast charge communication program is abnormal and reset to re-enter phase 1.

Optionally, in some embodiments, in stage 2, when the output voltage of the second adapter is higher than the current voltage of the battery to be charged (eg, the terminal) by ΔV (ΔV may be set to 200-500 mV), the device to be charged A reply command of instruction 2 can be sent to the control unit (eg, the terminal) to indicate that the output voltage of the second adapter matches the battery voltage of the device to be charged (eg, the terminal).

Optionally, in some embodiments, in stage 4, the adjustment speed of the output current of the second adapter can be controlled within a certain range, so as to avoid the second adapter in the second charging mode due to the too fast adjustment speed. An abnormality occurs in the output of the charging program to be charged to the charging device (such as the terminal).

Alternatively, in some embodiments, in stage 5, the magnitude of the change in the output current of the second adapter may be controlled within 5%.

Alternatively, in some embodiments, in stage 5, the control unit can immediately monitor the path impedance of the charging circuit. Specifically, the control unit may monitor the path impedance of the charging circuit according to the output voltage of the second adapter, the output current, and the current voltage of the battery to be fed back by the device to be charged (eg, the terminal). When "the path impedance of the charging circuit" > "the path impedance of the device to be charged (such as the terminal) + the impedance of the charging cable", it can be considered that the charging interface is in poor contact, and the second adapter stops charging in the second charging mode. The device (such as a terminal) is charged.

Optionally, in some embodiments, after the second adapter is turned on to charge a device to be charged (such as a terminal) in the second charging mode, a communication time interval between the control unit and the device to be charged (such as the terminal) may be The control is within a certain range, and the communication interval is too short to cause an abnormality in the communication program.

Optionally, in some embodiments, the stopping of the charging procedure (or the stopping of the charging procedure of the second adapter in a second charging mode for a device to be charged (such as a terminal)) may be divided into recoverable stop and unrecoverable. Stop both.

For example, when it is detected that the battery of the device to be charged (such as the terminal) is full or the charging interface is poorly contacted, the charging process is stopped, the charging communication program is reset, and the charging procedure re-enters Phase 1. Then, the device to be charged (such as the terminal) does not agree that the second adapter charges a device to be charged (such as a terminal) in the second charging mode, and the communication flow does not enter phase 2. The stop of the charging procedure in this case can be considered as an unrecoverable stop.

For another example, when a communication abnormality occurs between the control unit and the device to be charged (such as a terminal), the charging process is stopped, the charging communication program is reset, and the charging procedure re-enters Phase 1. After the requirements of phase 1 are met, the device to be charged (such as the terminal) agrees that the second adapter charges a device to be charged (such as a terminal) in the second charging mode to resume the charging process. The stop of the charging program in this case can be regarded as a recoverable stop.

For another example, when the device to be charged (such as the terminal) detects that the battery is abnormal, the charging process is stopped, the charging communication program is reset, and the charging procedure re-enters Phase 1. Then, the device to be charged (such as the terminal) does not agree that the second adapter charges a device to be charged (such as a terminal) in the second charging mode. When the battery returns to normal and meets the requirements of Phase 1, the device to be charged (such as the terminal) agrees that the second adapter charges a device to be charged (such as a terminal) in the second charging mode. The stop of the fast charge program in this case can be regarded as a recoverable stop.

The communication steps or operations shown above for FIG. 19B are merely examples. For example, in the phase 1, after the device to be charged (such as a terminal) is connected to the second adapter, the handshake communication between the device to be charged (such as the terminal) and the control unit may also be initiated by the device to be charged (such as a terminal), that is, The device to be charged (such as a terminal) sends an instruction 1 to inquire whether the control unit turns on the second charging mode. When the charging device (such as a terminal) receives a reply command from the control unit to instruct the control unit to agree that the second adapter charges a device to be charged (such as a terminal) in the second charging mode, the second adapter starts in the second charging mode. The battery of a device to be charged (such as a terminal) is charged.

As another example, after phase 5, a constant voltage charging phase can also be included. Specifically, in phase 5, the device to be charged (such as a terminal) can feed back the current voltage of the battery to the control unit. When the current voltage of the battery reaches the threshold value of the constant voltage charging voltage, the charging phase is switched from the constant current charging phase to the constant voltage. Charging phase. In the constant voltage charging phase, the charging current is gradually decreased, and when the current drops to a certain critical value, the entire charging process is stopped, indicating that the battery of the device to be charged (such as the terminal) has been fully charged.

Optionally, in some embodiments, the output current of the second adapter is a pulsating direct current (or a unidirectional pulsating output current, or a pulsating waveform current, or a head wave current). The waveform of the pulsating direct current is shown in Fig. 20.

As the output power of the second adapter becomes larger, when the second adapter charges the battery in the charging device (such as the terminal), it is easy to cause lithium deposition of the battery, thereby reducing the service life of the battery. In order to improve the reliability and safety of the battery, the embodiment of the invention controls the second adapter to output the pulsating direct current. The pulsating direct current can reduce the probability and intensity of the arcing of the contacts of the charging interface and improve the life of the charging interface. There are various ways of setting the output current of the second adapter to the pulsating direct current. For example, the secondary filtering unit in the power conversion unit 11 can be removed, and the secondary current can be directly rectified and outputted to form a pulsating direct current.

Further, as shown in FIG. 21, on the basis of any of the above embodiments, the second adapter 10 can support a first charging mode and a second charging mode, and the second adapter is in a second charging mode. The charging device (such as a terminal) is charged faster than the charging speed of the second adapter in a first charging mode to a device to be charged (such as a terminal). The power conversion unit 11 may include a primary filtering unit 211, the second adapter 10 may include a control unit 212, and the control unit 212 is connected to the secondary filtering unit 211. In the first charging mode, the control unit 212 controls the secondary filtering unit 211 to operate such that the voltage value of the output voltage of the second adapter 10 is constant. In the second charging mode, the control unit 212 controls the secondary filtering unit 211 to stop operating such that the output current of the second adapter 10 is pulsating direct current.

In the embodiment of the present invention, the control unit may control whether the secondary filtering unit operates, so that the second adapter can output a common direct current with a constant current value or a pulsating direct current with a changed current value, thereby being compatible with the existing charging mode.

Optionally, in some embodiments, the second adapter 10 supports a second charging mode. The second charging mode can be a constant current mode. In the second charging mode, the output current of the second adapter is an alternating current, and the alternating current can also reduce the lithium deposition phenomenon of the lithium battery and improve the service life of the battery.

Optionally, in some embodiments, the second adapter 10 supports a second charging mode, and the second charging mode may be a constant current mode. In the second charging mode, the output voltage and the output current of the second adapter are directly loaded. The battery is directly charged at both ends of the battery to be charged (such as a terminal).

Specifically, the direct charge may refer to directly loading (or directly guiding) the output voltage and the output current of the second adapter to the battery of the device to be charged (such as the terminal) to charge the battery of the device to be charged (such as the terminal). In the middle, there is no need to change the output current or output voltage of the second adapter through the conversion circuit to avoid energy loss caused by the conversion program. In the process of charging using the second charging mode, in order to be able to adjust the charging voltage or charging current on the charging circuit, the second adapter can be designed as a smart adapter, and the second adapter can complete the charging voltage or the charging current conversion. The burden on the device to be charged (such as the terminal) can be reduced, and the amount of heat generated by the device to be charged can be reduced. The constant current mode herein refers to a charging mode that controls the output current of the second adapter, and does not require that the output current of the second adapter be kept constant. In practice, the second adapter is typically charged in a constant current mode using a piecewise constant current.

Multi-stage constant current charging has N charging phases (N is an integer not less than 2). The piecewise constant current charging can start the first stage charging with a predetermined charging current. The N charging phases of the segmented constant current charging are sequentially performed from the first phase to the (N-1)th phase, and the charging current value becomes smaller after the previous charging phase in the charging phase is transferred to the next charging phase. When the battery voltage reaches the charge termination voltage threshold, the previous charging phase in the charging phase will move to the next charging phase.

Further, in the case that the output current of the second adapter is pulsating direct current, the constant current mode may refer to a charging mode that controls the peak value or the average value of the pulsating direct current, that is, the peak value of the output current of the second adapter is controlled not to exceed the constant current mode. The corresponding current is shown in Figure 22. Further, in the case where the output current of the second adapter is an alternating current, the constant current mode may refer to a charging mode that controls the peak value of the alternating current.

Embodiments of the present invention are described in more detail below with reference to specific examples. It should be noted that the example of Fig. 23 is only intended to assist those skilled in the art to understand the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to the specific numerical values or specific examples illustrated. A person skilled in the art will be able to make various modifications or changes in the embodiments according to the example of FIG. 23, and such modifications or variations are also within the scope of the embodiments of the present invention.

The second adapter includes a power conversion unit (corresponding to the power conversion unit 11 above). As shown in FIG. 23, the power conversion unit may include an input terminal of an alternating current AC, a primary rectifying unit 231, a transformer T1, a secondary rectifying unit 232, and a secondary filtering unit 233.

Specifically, the input terminal of the alternating current AC introduces commercial power (generally 220V alternating current), and then the commercial power is transmitted to the primary rectifying unit 231.

The primary rectification unit 231 is for converting the commercial power into the first pulsating direct current, and then transmitting the first pulsating direct current to the transformer T1. The primary rectifying unit 231 may be a bridge rectifying unit, and may be, for example, a full-bridge rectifying unit as shown in FIG. 23, or may be a half-bridge rectifying unit, which is not specifically limited in the embodiment of the present invention.

The primary side of the existing adapter includes a primary filtering unit. The primary filtering unit is generally based on a liquid aluminum electrolytic capacitor for filtering. The volume of the liquid aluminum electrolytic capacitor is large, which results in a large volume of the adapter. The primary side of the second adapter does not include a primary filtering unit, which greatly reduces the volume of the second adapter.

The transformer T1 is for coupling the first pulsating direct current from the primary to the secondary of the transformer to obtain a second pulsating direct current, and the second pulsating direct current is output by the secondary winding of the transformer T1. The transformer T1 can be an ordinary transformer or a high frequency transformer with an operating frequency of 50 kHz to 2 MHz. The number of the primary windings of the transformer T1 and the connection form are related to the type of the switching power supply used in the second adapter, which is not specifically limited in the embodiment of the present invention. As shown in Fig. 23, the second adapter can be a flyback switching power supply. One end of the primary winding of the transformer is connected to the primary rectifying unit 231, and the other end of the primary winding is connected to a switch controlled by the PWM controller. Of course, the second adapter can also be a second adapter that uses a forward switching power supply or a push-pull switching power supply. The primary rectifying units and transformers in different types of switching power supplies have their own connection forms, which are not listed here for brevity.

The secondary rectifying unit 232 is configured to rectify the second pulsating direct current outputted from the secondary winding of the transformer T1 to obtain a third pulsating direct current. There are various forms of the secondary rectifying unit 232. Fig. 23 shows a typical secondary synchronous rectification circuit including a Synchronous Rectifier (SR) chip, and a MOS controlled by the SR chip (Metal Oxide). A semiconductor, MOS) transistor, and a diode connected across the source and drain of the MOS transistor. The SR chip sends a PWM control signal to the gate of the MOS transistor to control the on and off of the MOS transistor, thereby achieving secondary synchronous rectification.

The secondary filtering unit 233 is configured to rectify the second pulsating direct current outputted by the secondary rectifying unit 232 to obtain an output voltage and an output current of the second adapter (ie, voltages and currents across VBUS and GND in FIG. 23). In the embodiment of Fig. 23, the capacitance in the secondary filtering unit 233 can be filtered by using a solid capacitor or a solid capacitor in parallel with a common capacitor (such as a ceramic capacitor).

Further, the secondary filtering unit 233 may further include a switching unit such as the switching transistor Q1 in FIG. The switch Q1 receives the control signal sent by the MCU. When the MCU control switch Q1 is closed, the secondary filter unit 233 operates such that the second adapter operates in the first charging mode. In the first charging mode, the output voltage of the second adapter can be 5V, and the output current is a smooth direct current. When the MCU control switch Q1 is turned off, the secondary filter unit 233 stops operating, and the second adapter operates in the second charging mode. In the second charging mode, the second adapter directly outputs the pulsating direct current output obtained by the secondary rectifying unit 232.

Further, the second adapter may include a voltage feedback unit (corresponding to the voltage feedback unit 12 above). As shown in FIG. 23, the voltage feedback unit may include a resistor R1, a resistor R2, and a first op amp OPA1.

Specifically, the resistor R1 and the resistor R2 sample the output voltage of the second adapter (ie, the voltage on the VBUS), and send the sampled first voltage to the inverting input of the OPA1 to indicate the output voltage of the second adapter. the size of. The non-inverting input of the first op amp OPA1 is connected to the DAC1 of the MCU through DAC1. The MCU adjusts the voltage value of the reference voltage of the first operational amplifier OPA1 (corresponding to the first reference voltage in the above) by controlling the magnitude of the analog quantity of the output of the DAC 1, thereby adjusting the voltage value of the target voltage corresponding to the voltage feedback unit.

Further, the second adapter may include a current feedback unit (corresponding to the current feedback unit 13 in the above). As shown in FIG. 23, the current feedback unit may include a resistor R3, a galvanometer, a resistor R4, a resistor R5, and a second op amp OPA2.

Specifically, the resistor R3 is a current detecting resistor. The galvanometer obtains the output current of a second adapter by detecting the current flowing through the resistor R3, and then converts the output current of the second adapter into a corresponding voltage value and outputs it to the resistor R4 and the resistor R5 for voltage division to obtain a first Two voltages. The second voltage can be used to indicate the magnitude of the output current of the second adapter. The inverting input of the second op amp OPA2 is for receiving the second voltage. The non-inverting input of the second op amp OPA2 is connected to the DAC2 of the MCU via DAC2. The MCU adjusts the voltage value of the reference voltage of the second operational amplifier OPA2 (corresponding to the second reference voltage in the above) by controlling the magnitude of the analog quantity of the output of the DAC 2, thereby adjusting the current value of the target current corresponding to the current feedback unit.

The second adapter also includes a power adjustment unit (corresponding to the power adjustment unit 14 above). As shown in FIG. 23, the power adjustment unit may include a first diode D1, a second diode D2, a photoelectric coupling unit 234, a PWM controller, and a switching transistor Q2.

Specifically, the first diode D1 and the second diode D2 are two antiparallel diodes, and the anodes of the first diode D1 and the second diode D2 are connected to the second embodiment. Feedback point. The input of the optocoupler unit 234 is used to receive the voltage signal of the feedback point. When the voltage at the feedback point is lower than the operating voltage VDD of the photo-coupling unit 234, the photo-coupling unit 234 starts operating to supply a feedback voltage to the FB terminal of the PWM controller. The PWM controller controls the duty cycle of the PWM signal output by the PWM terminal by comparing the voltages of the CS terminal and the FB terminal. When the voltage signal output by the first operational amplifier OPA1 (ie, the voltage feedback signal in the above) is 0, or the voltage signal output by the second operational amplifier OPA2 (ie, the current feedback signal in the above) is 0, the voltage at the FB terminal is stable. The duty cycle of the PWM control signal outputted by the PWM terminal of the PWM controller is kept constant. The PWM terminal of the PWM controller is connected to the primary winding of the transformer T1 through the switching transistor Q2 for controlling the output voltage and output current of the second adapter. When the duty ratio of the control signal sent from the PWM terminal is constant, the output voltage and output current of the second adapter remain stable.

Further, the second adapter of FIG. 23 further includes a first adjustment unit and a second adjustment unit. As shown in FIG. 23, the first adjusting unit includes an MCU (corresponding to the control unit in the above) and the DAC1 for adjusting the voltage value of the reference voltage of the first operational amplifier OPA1, thereby adjusting the target voltage corresponding to the voltage feedback unit. Voltage value. The second adjustment unit includes an MCU (corresponding to the control unit above) and a DAC 2 for adjusting the reference voltage of the second operational amplifier OPA2, thereby adjusting the current value of the target current corresponding to the current feedback unit.

The MCU can adjust the voltage value of the target voltage and the current value of the target current according to the charging mode currently used by the second adapter. For example, when the second adapter is charged in the constant voltage mode, the target voltage can be adjusted to the voltage corresponding to the constant voltage mode, and the target current can be adjusted to the maximum current allowed to be output in the constant voltage mode. For another example, when the second adapter is charged in the constant current mode, the target current can be adjusted to the current corresponding to the constant current mode, and the target voltage is adjusted to the maximum allowable output voltage in the constant current mode.

For example, in constant voltage mode, the target voltage can be adjusted to a fixed voltage value (such as 5V). Considering that the primary filtering unit is not provided on the primary side (the primary filtering unit uses a larger liquid aluminum electrolytic capacitor, in order to reduce the volume of the second adapter, the primary filtering unit is removed), the secondary filtering unit 233 The load capacity is limited and the target current can be set to 500mA or 1A. The second adapter first adjusts the output voltage to 5V based on the voltage feedback loop. Once the output current of the second adapter reaches the target current, the output current of the second adapter is controlled by the current feedback loop to not exceed the target current. In constant current mode, the target current can be set to 4A and the target voltage can be set to 5V. Since the output current of the second adapter is pulsating direct current, the current higher than 4A can be peak-cut by the current feedback loop, so that the peak current of the pulsating direct current is kept at 4A. Once the output voltage of the second adapter exceeds the target voltage, the output voltage of the second adapter is controlled by the voltage feedback loop to not exceed the target voltage.

In addition, the MCU can also include a communication interface. Through the communication interface, the MCU can perform bidirectional communication with a device to be charged (such as a terminal) to control the charging procedure of the second adapter. For example, the charging interface is a USB interface, and the communication interface can also be the USB interface. Specifically, the second adapter can use a power line in the USB interface to charge a device to be charged (such as a terminal), and use a data line (D+ and/or D-) in the USB interface and a device to be charged (such as a terminal). communication.

In addition, the photo-coupling unit 234 can also be connected to the voltage stabilizing unit such that the operating voltage of the optocoupler remains stable. As shown in FIG. 23, the voltage stabilizing unit in the embodiment of the present invention can be implemented by a Low Dropout Regulator (LDO).

Figure 23 is an example in which the control unit (MCU) adjusts the reference voltage of the first operational amplifier OPA1 through the DAC1 as an example. The adjustment method of the reference voltage corresponds to the reference voltage adjustment mode shown in Fig. 4, but The embodiment of the invention is not limited thereto, and any reference voltage adjustment manner as described in FIG. 5 to FIG. 8 may also be adopted, which will not be described in detail herein for brevity.

Figure 23 is an example in which the control unit (MCU) adjusts the reference voltage of the second operational amplifier OPA2 through the DAC2 as an example. The adjustment method of the reference voltage corresponds to the reference voltage adjustment method shown in Fig. 12, but The embodiment of the invention is not limited thereto, and any reference voltage adjustment manner as described in FIG. 13 to FIG. 16 may also be adopted, which will not be described in detail herein for the sake of brevity.

The apparatus embodiment of the present invention is described in detail above with reference to FIG. 1 to FIG. 23, and the method embodiment of the embodiment of the present invention is described in detail below with reference to FIG. 24, and the description of the method side and the description of the device side are understood. Corresponding to each other, for the sake of brevity, the repeated description is omitted as appropriate.

Figure 24 is a schematic flow chart of a charging control method according to an embodiment of the present invention. The charging method of Fig. 24 can be performed by the second adapter 10 of the above, and the method can include the following actions.

2410. Convert the input alternating current to obtain an output voltage and an output current of a second adapter.

2420. Detect the output voltage of the second adapter to generate a voltage feedback signal, and the voltage feedback signal is used to indicate whether the output voltage of the second adapter reaches a set target voltage.

2430. Detect the output current of the second adapter to generate a current feedback signal, and the current feedback signal is used to indicate whether the output current of the second adapter reaches a set target current.

2440. The output voltage and the output current of the second adapter are stabilized when the voltage feedback signal indicates that the output voltage of the second adapter reaches the target voltage, or the current feedback signal indicates that the output current of the second adapter reaches the target current.

Optionally, in some embodiments, the second adapter supports a first charging mode, and the first charging mode is a constant voltage mode. In the constant voltage mode, the target voltage is the voltage corresponding to the constant voltage mode, and the target current is the maximum current allowed to be output by the second adapter in the constant voltage mode. The method of FIG. 24 may further include: adjusting the output voltage of the second adapter to a voltage corresponding to the constant voltage mode according to the voltage feedback signal. The 2440 may include: when the current feedback signal indicates that the output current of the second adapter reaches the maximum current allowed to be output by the second adapter in the constant voltage mode, controlling the output current of the second adapter does not exceed the second adapter allowing in the constant voltage mode The maximum current output.

Optionally, in some embodiments, the second adapter includes a primary rectifying unit, a transformer, a primary rectifying unit, and a primary filtering unit that directly outputs the pulsating form of the voltage to the transformer.

Optionally, in some embodiments, the maximum current allowed to be output by the second adapter in the constant voltage mode is determined based on the capacity of the capacitance in the secondary filtering unit.

Optionally, in some embodiments, the second adapter supports a second charging mode. The second charging mode is a constant current mode. In the constant current mode, the target voltage is the maximum voltage that the second adapter is allowed to output in the constant current mode, and the target current is the current corresponding to the constant current mode. The method of Figure 24 further includes: adjusting the output current of the second adapter to a current corresponding to the constant current mode according to the current feedback signal. The 2440 may include: when the voltage feedback signal indicates that the output voltage of the second adapter reaches the maximum voltage allowed to be output by the second adapter in the constant current mode, controlling the output voltage of the second adapter does not exceed the second adapter allowing in the constant current mode The maximum voltage output.

Optionally, in some embodiments, the method of FIG. 24 may further include: adjusting a value of the target voltage.

Optionally, in some embodiments, the second adapter supports a first charging mode and a second charging mode, where the value of the adjusting target voltage may include: based on a first charging mode currently used by a second adapter or In the second charging mode, the value of the target voltage is adjusted.

Optionally, in some embodiments, detecting the output voltage of the second adapter to generate a voltage feedback signal may include: sampling an output voltage of the second adapter to obtain a first voltage; comparing the first voltage and a first reference voltage; generating a voltage feedback signal based on the comparison result of the first voltage and a first reference voltage; adjusting the value of the target voltage, comprising: adjusting the target voltage by adjusting the value of the first reference voltage value.

Optionally, in some embodiments, the value of the first reference voltage is adjusted based on the first DAC.

Optionally, in some embodiments, the value of the first reference voltage is adjusted based on an RC filtering unit.

Optionally, in some embodiments, the value of the first reference voltage is adjusted based on a digital potentiometer.

Optionally, in some embodiments, detecting the output voltage of the second adapter to generate a voltage feedback signal may include: dividing the output voltage of the second adapter according to the set voltage dividing ratio to generate a first a voltage; comparing the first voltage with a first reference voltage; generating a voltage feedback signal based on the comparison result of the first voltage and a first reference voltage; the value of the adjustment target voltage may include: adjusting the voltage division ratio, adjusting The voltage value of the target voltage.

Optionally, in some embodiments, the voltage division ratio is a voltage division ratio of the digit potentiometer.

Optionally, in some embodiments, the method of FIG. 24 may further include: adjusting a current value of the target current.

Optionally, in some embodiments, the second adapter supports a first charging mode and a second charging mode. The adjusting the current value of the target current may include adjusting a current value of the target current based on a first charging mode or a second charging mode currently used by the second adapter.

Optionally, in some embodiments, detecting the output current of the second adapter to generate a current feedback signal may include: sampling an output current of the second adapter to obtain a second voltage, where the second voltage is used for And indicating a magnitude of an output current of the second adapter; comparing the second voltage with a second reference voltage; generating a current feedback signal based on a comparison result of the second voltage and a second reference voltage; and determining a current value of the target current The method includes: adjusting a current value of the target current by adjusting a voltage value of the second reference voltage.

Optionally, in some embodiments, the value of the second reference voltage is adjusted based on a second DAC.

Optionally, in some embodiments, the value of the second reference voltage is adjusted based on the RC filtering unit.

Optionally, in some embodiments, the value of the second reference voltage is adjusted based on a digital potentiometer.

Optionally, in some embodiments, detecting the output current of the second adapter to generate a current feedback signal may include: sampling an output current of the second adapter to obtain a third voltage, and using the third voltage And indicating a magnitude of an output current of the second adapter; dividing the third voltage according to the set voltage dividing ratio to generate a second voltage; comparing the second voltage and a second reference voltage; and based on a second voltage and a first The comparison result of the two reference voltages generates a current feedback signal; the current value of the adjustment target current may include: adjusting the current value of the target current by adjusting the voltage dividing ratio.

Optionally, in some embodiments, the voltage division ratio is a voltage division ratio of the digit potentiometer.

Optionally, in some embodiments, the second adapter supports a first charging mode and a second charging mode. The second adapter charges the device to be charged in the second charging mode faster than the charging rate of the device to be charged in the first charging mode by the second adapter. The method of FIG. 24 may further include: performing bidirectional communication with the device to be charged in a program in which the second adapter is connected to the device to be charged to control an output of the second adapter in the second charging mode.

Optionally, in some embodiments, the program for bidirectional communication with the device to be charged to control the output of the second adapter in the second charging mode may include: performing two-way communication with the device to be charged, To negotiate a charging mode between the second adapter and the device to be charged.

Optionally, in some embodiments, the two-way communication with the device to be charged to negotiate the charging mode between the second adapter and the device to be charged may include: sending a first instruction to the device to be charged, The first instruction is used to query whether the to-be-charged device turns on the second charging mode; receive a reply command of the first instruction sent by the device to be charged, and the reply command of the first instruction is used to indicate whether the device to be charged agrees Turning on the second charging mode; and using the second charging mode to charge the device to be charged when the device to be charged agrees to turn on the second charging mode.

Optionally, in some embodiments, the program for bidirectional communication with the device to be charged to control the output of the second adapter in the second charging mode may include: performing two-way communication with the device to be charged, Determining, by the second adapter in the second charging mode, a charging voltage for charging the device to be charged; adjusting a voltage value of the target voltage such that a voltage value of the target voltage is equal to The charging voltage output by the second adapter in the second charging mode for charging the device to be charged.

Optionally, in some embodiments, the two-way communication with the device to be charged determines that the charging voltage output by the second adapter in the second charging mode for charging the device to be charged may include Sending a second command to the device to be charged, the second command is used to query whether the output voltage of the second adapter matches the current voltage of a battery of the device to be charged; and receive the second signal sent by the device to be charged The reply instruction of the instruction, the reply instruction of the second instruction is used to indicate that the output voltage of the second adapter matches, is higher or lower than the current voltage of the battery.

Optionally, in some embodiments, the program for bidirectional communication with the device to be charged to control the output of the second adapter in the second charging mode may include: performing two-way communication with the device to be charged, Determining, by the second adapter in the second charging mode, a charging current for charging the device to be charged; adjusting a current value of the target current, so that a current value of the target current is equal to The charging current output by the second adapter in the second charging mode for charging the device to be charged.

Optionally, in some embodiments, the two-way communication with the device to be charged determines that the charging current output by the second adapter in the second charging mode for charging the device to be charged may include Transmitting, to the device to be charged, a third command for inquiring about a maximum charging current currently supported by the device to be charged; receiving a reply command of the third command sent by the device to be charged, the third command The reply command is used to indicate a maximum charging current currently supported by the device to be charged; determining, according to the maximum charging current currently supported by the device to be charged, the output of the second adapter in the second charging mode for performing the device to be charged Charging current.

Optionally, in some embodiments, the program for bidirectional communication with the device to be charged to control the output of the second adapter in the second charging mode may include: charging using the second charging mode In the program, two-way communication is performed with the device to be charged to adjust the output current of the second adapter.

Optionally, in some embodiments, the two-way communication with the device to be charged to adjust the output current of the second adapter may include: sending a fourth command to the device to be charged, the fourth command is used for Querying a current voltage of a battery of the device to be charged; receiving a reply command of the fourth command sent by the second adapter, the reply command of the fourth command is used to indicate a current voltage of the battery; according to a current voltage of the battery, Adjust the output current of the second adapter.

Optionally, in some embodiments, the second adapter includes a charging interface. The second adapter communicates with the device to be charged in two directions through a data line in the charging interface.

Optionally, in some embodiments, the second adapter supports a second charging mode. The second charging mode is a constant current mode, and in the second charging mode, the output current of the second adapter is a pulsating direct current.

Optionally, in some embodiments, the second adapter supports a first charging mode. The first charging mode is a constant voltage mode. The second adapter includes a primary filtering unit, and the method of FIG. 24 further includes: controlling, in the first charging mode, the secondary filtering unit to operate such that a voltage value of the output voltage of the second adapter is constant; In the second charging mode, the secondary filtering unit is controlled to stop working, so that the output current of the second adapter is pulsed direct current.

Optionally, in some embodiments, the second adapter supports a second charging mode. The second charging mode is a constant current mode, and in the second charging mode, the output current of the second adapter is alternating current.

Optionally, in some embodiments, the second adapter supports a second charging mode. In the second charging mode, the output voltage and the output current of the second adapter are directly loaded on both ends of a battery of the device to be charged, and the battery is directly charged.

Optionally, in some embodiments, the second adapter is a second adapter for charging the mobile device to be charged.

Optionally, in some embodiments, the second adapter includes a control unit for controlling the charging program, the control unit being an MCU.

Optionally, in some embodiments, the second adapter includes a charging interface, and the charging interface is a USB interface.

It should be understood that the "first adapter" and "second adapter" herein are for convenience of description only, and are not intended to limit the specific types of adapters of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in the form of an electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working procedures of the system, the device and the unit described above can refer to the corresponding programs in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division, and the actual implementation may have another division manner, for example, a plurality of units or components may be combined or may be integrated into Another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

This function, if implemented as a software functional unit and sold or used as a standalone product, can be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product in essence or in part of the prior art, and the computer software product is stored in a storage medium, including several The instructions are for causing a computer device (which may be a personal computer, a server, a second adapter or a network device, etc.) to perform all or part of the steps of the method in accordance with various embodiments of the present invention. The foregoing storage medium includes: a flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or a compact disk, and the like. Media.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection of the scope of the claims.

10‧‧‧Adapter

11‧‧‧Power Conversion Unit

12‧‧‧Voltage feedback unit

13‧‧‧current feedback unit

14‧‧‧Power adjustment unit

15, 231‧‧‧ primary rectification unit

16‧‧‧Transformers

17, 232‧‧‧Secondary rectifier unit

18, 211, 233‧ ‧ secondary filter unit

21, 101‧‧‧ adjustment unit

31‧‧‧Voltage sampling unit

32, 72‧‧‧ voltage comparison unit

41, 51, 61, 82, 121, 131, 141, 162, 212‧‧‧ control unit

42, 122‧‧‧Digital Analog Converters (DACs)

52, 132‧‧‧RC filter unit

62, 81, 142, 161‧‧‧ digit potentiometer

71, 152‧‧ ‧ partial pressure unit

111, 151‧‧‧ Current sampling unit

112, 153‧‧‧ Current comparison unit

181‧‧‧Photoelectric coupling unit

182‧‧‧PWM control unit

D1, D2‧‧‧ diode

191‧‧‧Charging interface

192‧‧‧Information line

AC‧‧‧AC

LDO‧‧‧ Low Dropout Regulator

MCU‧‧‧Micro Control Unit

OPA1, OPA2‧‧‧Operation

PWM‧‧‧ pulse width modulation

R1, R2, R3, R4, R5‧‧‧ resistors

T1‧‧‧ transformer

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work. Fig. 1A is a schematic structural view of a second adapter of one embodiment of the present invention. FIG. 1B is a schematic structural diagram of a power conversion unit according to an embodiment of the present invention. Fig. 2 is a schematic structural view of a second adapter according to another embodiment of the present invention. Fig. 3 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Fig. 4 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Fig. 5 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Fig. 6 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Fig. 7 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Fig. 8 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Fig. 9 is a schematic configuration diagram of a voltage comparison unit of an embodiment of the present invention. Fig. 10 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Figure 11 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Fig. 12 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Figure 13 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Figure 14 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Figure 15 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Figure 16 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Figure 17 is a schematic configuration diagram of a current comparison unit of an embodiment of the present invention. Figure 18 is a schematic structural view of a second adapter according to still another embodiment of the present invention. FIG. 19A is a schematic diagram showing the connection manner of the second adapter and the device to be charged according to the embodiment of the present invention. Figure 19B is a schematic diagram of a fast charge communication program in accordance with an embodiment of the present invention. Figure 20 is a schematic diagram of the current waveform of the pulsating direct current. Figure 21 is a schematic structural view of a second adapter according to still another embodiment of the present invention. Fig. 22 is a view showing the pulsating direct current in the constant current mode of the embodiment of the present invention. Figure 23 is a circuit diagram showing the second adapter of the embodiment of the present invention. Figure 24 is a schematic flow chart of a charging control method according to an embodiment of the present invention.

Claims (53)

An adapter, wherein the adapter supports a first charging mode and a second charging mode, wherein the adapter charges the device to be charged faster than the adapter in the first charging mode in the second charging mode For charging the device to be charged, the adapter includes: a power conversion unit for converting the input alternating current to obtain an output voltage and an output current of the adapter; and a voltage feedback unit having an input end of the voltage feedback unit Connected to the power conversion unit, the voltage feedback unit is configured to detect the output voltage of the adapter to generate a voltage feedback signal, the voltage feedback signal is used to indicate whether the output voltage of the adapter reaches a set target voltage; a current feedback unit, the input end of the current feedback unit is connected to the power conversion unit, and the current feedback unit is configured to detect an output current of the adapter to generate a current feedback signal, the current feedback signal is used to indicate the adapter Whether the output current reaches a set target current; a power An integral unit, an input end of the power adjustment unit is connected to an output end of the voltage feedback unit and an output end of the current feedback unit, and an output end of the power adjustment unit is connected to the power conversion unit, and the power adjustment unit is configured to receive the The voltage feedback signal and the current feedback signal, and the output of the adapter is stabilized if the voltage feedback signal indicates that the output voltage of the adapter reaches the target voltage, or the current feedback signal indicates that the output current of the adapter reaches the target current Voltage and output current; wherein the adapter communicates bidirectionally with the device to be charged. The adapter of claim 1, the adapter further comprising a first adjusting unit, the first adjusting unit being connected to the voltage feedback unit for adjusting the value of the target voltage. The voltage feedback unit includes: a voltage sampling unit, wherein the input end of the voltage sampling unit is connected to the power conversion unit for sampling the output voltage of the adapter to obtain a First voltage a voltage comparison unit, the input end of the voltage comparison unit is connected to the output end of the voltage sampling unit, for comparing the first voltage and a first reference voltage, and based on comparing the first voltage with the first reference voltage As a result, the voltage feedback signal is generated; the first adjustment unit is connected to the voltage comparison unit, and the first reference voltage is provided for the voltage comparison unit, and the value of the first reference voltage is adjusted to adjust the target voltage. value. The adapter of claim 3, wherein the first adjusting unit comprises a control unit and a digital potentiometer, and the control end of the digital potentiometer is connected to the control unit, and the output of the digital potentiometer and the voltage The comparison unit is connected, and the control unit adjusts the value of the first reference voltage by adjusting a voltage division ratio of the digital potentiometer. The voltage comparison unit includes a first operational amplifier, and the inverting input terminal of the first operational amplifier of the voltage comparison unit is configured to receive the first voltage, where the adapter is configured according to claim 3 or 4 The non-inverting input of the first operational amplifier of the voltage comparison unit is configured to receive the first reference voltage, and the output of the first operational amplifier of the voltage comparison unit is configured to generate the voltage feedback signal. The adapter of claim 2, wherein the first adjustment unit adjusts the value of the target voltage based on a first charging mode or a second charging mode currently used by the adapter. The adapter of claim 1, wherein the adapter further comprises a second adjusting unit, the second adjusting unit is connected to the current feedback unit for adjusting a current value of the target current. The current feedback unit includes: a current sampling unit, wherein the input end of the current sampling unit is connected to the power conversion unit for sampling the output current of the adapter to obtain a a second voltage, the second voltage is used to indicate the magnitude of the output current of the adapter; a current comparison unit, the input end of the current comparison unit is connected to the output end of the current sampling unit, for comparing the second voltage and a a second reference voltage, and based on a comparison result of the second voltage and the second reference voltage, generating the current feedback signal; The second adjusting unit is connected to the current comparing unit, and provides the second reference voltage for the current comparing unit, and adjusts the current value of the target current by adjusting the voltage value of the second reference voltage. The adapter of claim 8, wherein the second adjusting unit comprises a control unit and a second DAC, the input end of the second DAC is connected to the control unit, and the output of the second DAC and the current The comparison unit is connected, and the control unit adjusts the voltage value of the second reference voltage through the second DAC. The adapter of claim 8 or 9, wherein the current comparison unit includes a second operational amplifier, and the inverting input of the second operational amplifier of the current comparison unit is configured to receive the second voltage. The non-inverting input of the second operational amplifier of the current comparison unit is configured to receive the second reference voltage, and the output of the second operational amplifier of the current comparison unit is configured to generate the current feedback signal. The adapter of claim 8, wherein the second adjustment unit adjusts a current value of the target current based on a first charging mode or a second charging mode currently used by the adapter. The adapter according to claim 1, wherein the first charging mode is a constant voltage mode, and in the constant voltage mode, the target voltage is a voltage corresponding to the constant voltage mode, and the target current is the constant of the adapter. The maximum current allowed in the voltage mode; the power adjustment unit is specifically configured to adjust the output voltage of the adapter to the voltage corresponding to the constant voltage mode according to the voltage feedback signal, and when the current feedback signal indicates the output current of the adapter When the maximum current allowed by the adapter in the constant voltage mode is reached, the output current of the adapter is controlled to not exceed the maximum current allowed by the adapter in the constant voltage mode. The adapter of claim 12, the power conversion unit includes a primary rectification unit, a transformer, a primary rectification unit, and a primary filter unit, the primary rectification unit directly outputting a voltage in a pulsating form to the transformer. The adapter of claim 13 is characterized in that the maximum current allowed by the adapter in the constant voltage mode is determined based on the capacity of the capacitor in the secondary filtering unit. The adapter according to claim 1, wherein the second charging mode is a constant current mode, and in the constant current mode, the target voltage is a maximum voltage that the adapter allows to output in the constant current mode, the target current a current corresponding to the constant current mode; the power adjustment unit is specifically configured to adjust an output current of the adapter to a current corresponding to the constant current mode according to the current feedback signal, and when the voltage feedback signal indicates an output voltage of the adapter When the maximum voltage allowed by the adapter in the constant current mode is reached, the output voltage of the control is controlled to not exceed the maximum voltage that the adapter is allowed to output in the constant current mode. The voltage feedback unit includes a first operational amplifier, and the output of the first operational amplifier of the voltage feedback unit is configured to output the voltage feedback signal, and the current feedback unit includes a first a second operational amplifier, the output of the second operational amplifier of the current feedback unit is configured to output the current feedback signal; the power adjustment unit includes a first diode, a second diode, a photoelectric coupling unit and a pulse a width modulation PWM control unit, the output end of the first operational amplifier of the voltage feedback unit is connected to the negative pole of the first diode, and the anode of the first diode is connected to the input end of the photoelectric coupling unit, the current An output end of the second operational amplifier of the feedback unit is connected to a negative pole of the second diode, and a positive pole of the second diode is connected to an input end of the photoelectric coupling unit, and an output end of the photoelectric coupling unit and the pulse width The input end of the modulation PWM control unit is connected, and the output end of the pulse width modulation PWM control unit is connected to the power conversion unit. The adapter of claim 1, wherein the adapter comprises a control unit, wherein the control unit is in two-way communication with the device to be charged to control the second charging in the program connected to the device to be charged. The output of this adapter in mode. The adapter of claim 17, wherein the control unit performs bidirectional communication with the device to be charged to control an output of the adapter in the second charging mode, including: the control unit and the to-be-charged The device performs two-way communication to negotiate the adapter and the device to be charged The charging mode between. The adapter of claim 18, wherein the control unit performs two-way communication with the device to be charged to negotiate a charging mode between the adapter and the device to be charged, including: the control unit sends the device to the device to be charged a first instruction, the first instruction is used to query whether the to-be-charged device turns on the second charging mode; the control unit receives a reply instruction of the first instruction sent by the to-be-charged device, and the reply instruction of the first instruction is used And indicating whether the device to be charged agrees to turn on the second charging mode; and when the device to be charged agrees to turn on the second charging mode, the control unit uses the second charging mode to charge the device to be charged. The adapter of claim 17, wherein the control unit performs bidirectional communication with the device to be charged to control an output of the adapter in the second charging mode, including: the control unit and the to-be-charged The device performs two-way communication to determine a charging voltage output by the adapter for charging the device to be charged in the second charging mode; the control unit adjusts the voltage value of the target voltage to make the target voltage The voltage value is equal to the charging voltage output by the adapter in the second charging mode for charging the device to be charged. The adapter of claim 20, wherein the control unit performs bidirectional communication with the device to be charged to determine a charging voltage output by the adapter for charging the device to be charged in the second charging mode. The control unit sends a second command to the device to be charged, the second command is used to query whether the output voltage of the adapter matches the current voltage of a battery of the device to be charged; the control unit receives the to-be-charged The reply instruction of the second instruction sent by the device, the reply instruction of the second instruction is used to indicate that the output voltage of the adapter matches the current voltage of the battery, being high or low. The adapter of claim 17, wherein the control unit performs bidirectional communication with the device to be charged to control an output of the adapter in the second charging mode, including: the control unit and the to-be-charged The device performs two-way communication to determine a charging current output by the adapter for charging the device to be charged in the second charging mode; the control unit adjusts a current value of the target current to make the target current The current value is equal to the charging current output by the adapter in the second charging mode for charging the device to be charged. The adapter of claim 22, wherein the control unit performs bidirectional communication with the device to be charged to determine a charging current output by the adapter for charging the device to be charged in the second charging mode. The control unit sends a third command to the device to be charged, the third command is used to query the maximum charging current currently supported by the device to be charged; and the control unit receives the third command sent by the device to be charged a reply instruction, the reply instruction of the third instruction is used to indicate a maximum charging current currently supported by the device to be charged; and the control unit determines the adapter output in the second charging mode according to a maximum charging current currently supported by the device to be charged A charging current for charging the device to be charged. The adapter of claim 17, wherein the control unit performs bidirectional communication with the device to be charged to control an output of the adapter in the second charging mode, including: using the second charging mode In the charging process, the control unit performs bidirectional communication with the device to be charged to adjust the output current of the adapter. The adapter of claim 24, wherein the control unit performs bidirectional communication with the device to be charged to adjust an output current of the adapter, and includes: a fourth command sent by the control unit to the device to be charged, The fourth instruction is used to query the current voltage of a battery of the device to be charged; The control unit receives a reply instruction of the fourth instruction sent by the adapter, and the reply instruction of the fourth instruction is used to indicate a current voltage of the battery; the control unit adjusts an output current of the adapter according to a current voltage of the battery. The adapter of claim 1, wherein the adapter is an adapter for charging a mobile device to be charged. The adapter of claim 1, wherein the adapter includes a control unit for controlling the charging program, the control unit being a micro control unit MCU. The adapter of claim 1, wherein the adapter comprises a charging interface, and the charging interface is a universal serial bus USB interface. A charging control method, wherein the method is applied to an adapter, the adapter supports a first charging mode and a second charging mode, and the adapter charges the charging device to be faster than the charging device in the second charging mode The charging speed of the adapter to be charged in the first charging mode, the method comprising: converting the input alternating current to obtain an output voltage and an output current of the adapter; detecting an output voltage of the adapter to generate a voltage feedback signal, the voltage feedback signal is used to indicate whether the output voltage of the adapter reaches a set target voltage; the output current of the adapter is detected to generate a current feedback signal, the current feedback signal is used to indicate the adapter Whether the output current reaches a set target current; when the voltage feedback signal indicates that the output voltage of the adapter reaches the target voltage, or the current feedback signal indicates that the output current of the adapter reaches the target current, the adapter is stabilized Output voltage and output current; With the two-way communication device to be charged. The charging control method according to claim 29, wherein the method further comprises: adjusting a value of the target voltage. The charging control method according to claim 30, wherein the output voltage of the adapter is detected to generate a voltage feedback signal, comprising: sampling an output voltage of the adapter to obtain a first voltage; comparing the a first voltage and a first reference voltage; generating a voltage feedback signal based on the comparison result of the first voltage and the first reference voltage; adjusting the value of the target voltage, comprising: adjusting the first reference voltage Take the value and adjust the value of the target voltage. The charging control method according to claim 31, wherein the value of the first reference voltage is adjusted based on a digital potentiometer. The charging control method according to any one of claims 30 to 32, wherein the adjusting the value of the target voltage comprises: adjusting based on a first charging mode or a second charging mode currently used by the adapter The value of the target voltage. The charging control method according to claim 29, wherein the method further comprises: adjusting a current value of the target current. The charging control method according to claim 34, wherein the output current of the adapter is detected to generate a current feedback signal, comprising: sampling an output current of the adapter to obtain a second voltage, the first The second voltage is used to indicate the magnitude of the output current of the adapter; the second voltage is compared with a second reference voltage; and the current feedback signal is generated based on the comparison result of the second voltage and the second reference voltage; The current value of the current includes: adjusting a current value of the target current by adjusting a voltage value of the second reference voltage. The charging control method according to claim 35, wherein the value of the second reference voltage is adjusted based on a second digital analog converter DAC. The charging control method according to claim 34, wherein the adjusting the current value of the target current comprises: adjusting a current value of the target current based on a first charging mode or a second charging mode currently used by the adapter. The charging control method according to claim 29, wherein the first charging mode is a constant voltage mode, and in the constant voltage mode, the target voltage is a voltage corresponding to the constant voltage mode, and the target current is the adapter The maximum current allowed in the constant voltage mode, the method further includes: adjusting the output voltage of the adapter to a voltage corresponding to the constant voltage mode according to the voltage feedback signal; the voltage feedback signal indicating the output voltage of the adapter When the target voltage is reached, or the current feedback signal indicates that the output current of the adapter reaches the target current, the output voltage and the output current of the adapter are stabilized, including: when the current feedback signal indicates that the output current of the adapter reaches the adapter When the maximum current output is allowed in the constant voltage mode, the output current of the control adapter is not exceeded by the maximum current allowed by the adapter in the constant voltage mode. The charging control method according to claim 38, wherein the adapter comprises a primary rectifying unit, a transformer, a primary rectifying unit, and a primary filtering unit, the primary rectifying unit directly outputting a voltage in a pulsating form to the transformer. The charging control method according to claim 39, wherein the maximum current allowed by the adapter in the constant voltage mode is determined based on the capacity of the capacitor in the secondary filtering unit. The charging control method according to claim 29, wherein the second charging mode is a constant current mode, and in the constant current mode, the target voltage is a maximum voltage that the adapter allows to output in the constant current mode, The target current is the current corresponding to the constant current mode; the method further includes: adjusting the output current of the adapter to the current corresponding to the constant current mode according to the current feedback signal; the feedback signal at the voltage indicating the output voltage of the adapter When the target voltage is reached, or the current feedback signal indicates that the output current of the adapter reaches the target current, the output voltage and the output current of the adapter are stabilized, including: when the voltage feedback signal indicates that the output voltage of the adapter reaches the adapter When the maximum voltage of the output is allowed in the constant current mode, the output voltage of the adapter is controlled not to exceed the maximum voltage allowed by the adapter in the constant current mode. The charging control method of claim 29, the method further comprising: performing two-way communication with the device to be charged in a program connected to the device to be charged to control the second charging mode; The output of this adapter. The charging control method according to claim 42, wherein the program for bidirectional communication with the device to be charged to control the output of the adapter in the second charging mode comprises: bidirectionally interacting with the device to be charged Communication to negotiate a charging mode between the adapter and the device to be charged. The charging control method of claim 43, wherein the two-way communication with the device to be charged to negotiate a charging mode between the adapter and the device to be charged includes: transmitting a first to the device to be charged The first instruction is used to query whether the device to be charged is enabled to turn on the second charging mode; to receive a reply command of the first instruction sent by the device to be charged, and the reply command of the first instruction is used And indicating whether the device to be charged agrees to turn on the second charging mode; and when the device to be charged agrees to turn on the second charging mode, using the second charging mode to charge the device to be charged. The charging control method according to claim 42, wherein the program for bidirectional communication with the device to be charged to control the output of the adapter in the second charging mode comprises: bidirectionally interacting with the device to be charged Communicating to determine a charging voltage output by the adapter for charging the device to be charged in the second charging mode; adjusting a voltage value of the target voltage such that a voltage value of the target voltage is equal to The charging voltage output by the adapter in the second charging mode for charging the device to be charged. The charging control method according to claim 45, wherein the charging device performs two-way communication with the device to be charged to determine a charging voltage output by the adapter for charging the device to be charged in the second charging mode. The method includes: sending a second instruction to the device to be charged, the second command is used to query whether an output voltage of the adapter matches a current voltage of a battery of the device to be charged; and receiving the second message sent by the device to be charged The reply instruction of the instruction, the reply instruction of the second instruction is used to indicate that the output voltage of the adapter matches the current voltage of the battery, being high or low. The charging control method according to claim 42, wherein the program for bidirectional communication with the device to be charged to control the output of the adapter in the second charging mode comprises: bidirectionally interacting with the device to be charged Communicating to determine a charging current output by the adapter for charging the device to be charged in the second charging mode; adjusting a current value of the target current such that a current value of the target current is equal to The charging current output by the adapter in the second charging mode for charging the device to be charged. The charging control method according to claim 47, wherein the charging device performs two-way communication to determine a charging current output by the adapter in the second charging mode for charging the device to be charged. The method includes: sending a third command to the device to be charged, the third command is used to query a maximum charging current currently supported by the device to be charged; and receiving a reply command of the third command sent by the device to be charged, the third The command output command is used to indicate the maximum charging current currently supported by the device to be charged; determining, according to the maximum charging current currently supported by the device to be charged, the output of the adapter in the second charging mode for performing the device to be charged Charging current. The charging control method according to claim 42, wherein the program for bidirectional communication with the device to be charged to control the output of the adapter in the second charging mode comprises: using the second charging mode In the charging process, two-way communication is performed with the device to be charged to adjust the output current of the adapter. The charging control method of claim 49, the two-way communication with the device to be charged to adjust the output current of the adapter, comprising: a fourth command sent to the device to be charged, the fourth command a current voltage for inquiring a battery of the device to be charged; receiving a reply command of the fourth command sent by the adapter, the reply command of the fourth command is used to indicate a current voltage of the battery; according to a current voltage of the battery, Adjust the output current of the adapter. The charging control method according to claim 29, wherein the adapter is an adapter for charging a mobile charging device. The charging control method according to claim 29, wherein the adapter comprises a control unit for controlling the charging program, the control unit being a micro control unit MCU. The charging control method according to claim 29, wherein the adapter comprises a charging interface, and the charging interface is a universal serial bus USB interface.