CN210074886U - High integration linear charging voltage stabilizing circuit and charging circuit for low power device - Google Patents
High integration linear charging voltage stabilizing circuit and charging circuit for low power device Download PDFInfo
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- CN210074886U CN210074886U CN201920637028.4U CN201920637028U CN210074886U CN 210074886 U CN210074886 U CN 210074886U CN 201920637028 U CN201920637028 U CN 201920637028U CN 210074886 U CN210074886 U CN 210074886U
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Abstract
The utility model relates to a wireless charging technology field provides a high integrated linear charging voltage stabilizing circuit and charging circuit. The high-integration linear charging voltage stabilizing circuit mainly comprises a rectifying module, a linear charging voltage stabilizing module and a power supply self-switching module; the linear charging and voltage stabilizing module is configured to execute a linear charging mode on a battery type load according to a first instruction input by a user and execute a linear voltage stabilizing output mode on a non-battery type load according to a second instruction input by the user; the power supply self-switching module is configured to flexibly switch the high-integration linear charging voltage stabilizing circuit between a wired power supply mode or a wireless power supply mode. Compared with the prior art, the highly integrated linear charging voltage stabilizing circuit provided by the utility model realizes the linear charging function or the linear voltage stabilizing output function with less external component requirements; the charging device is applied to low-power equipment charging products, so that the size or dimension of the charging products is greatly reduced, the cost of the charging equipment is reduced, and the charging device has wider application prospect.
Description
Technical Field
The utility model relates to a wireless charging technical field in the integrated circuit field, more specifically say, relate to a high integrated linear charging voltage stabilizing circuit and contain this high integrated linear charging voltage stabilizing circuit's a charging circuit for low power equipment.
Background
Wireless charging technologies based on wpc (wireless Power consortium) or Qi protocols are more sophisticated and therefore more widely used than other technologies. The wireless energy transmission device is based on an electromagnetic induction mode, and energy is induced into a secondary coil from a primary coil, so that the function of wireless energy transmission is achieved.
WPC currently defines the Basic Power Profile (BPP), mainly for low Power devices below 5W. And Extended Power Profile (EPP), mainly for medium Power devices within 15W. BPP devices are simpler in specification than EPP devices. For example, in communication protocol support, BPP only requires support for ASK load modulation/demodulation, while EPP requires bi-directional ASK and FSK modulation/demodulation. EPP equipment is more demanding in terms of efficiency, heat dissipation, etc., and thus tends to be more costly. However, there is a greater demand for BPP devices for a wide range of low power application products, such as wearable devices and the like. At the same time, there are more stringent requirements on the cost or the physical size of the device, especially for the receiving device of BPP.
A typical wireless charging receiver generally includes: a wireless receiving coil, a wireless receiving chip, a battery charging management chip, etc., as shown in fig. 1. The wireless receiving coil is responsible for sensing the energy (AC1, AC2 output) of the transmitting end coil, the wireless receiving chip is responsible for rectifying the received energy into a stable voltage (VOUT output) in a linear or switch mode, and the battery charging management chip (BAT output) is responsible for charging a battery load and providing protection, such as over-temperature, overvoltage, overcurrent and the like. Since the batteries of the load may have different forms (such as single-stage or multi-stage) or different capacities, the charging voltage or current required is different, and therefore, the charging is usually performed by a separate battery charging management chip. The chip can be a linear or switch type charging chip according to different requirements. Compared with a switch mode which is mostly used for medium and high power application, the linear mode does not need external large inductance, saves the cost and the volume of peripheral components and is more used for low-power equipment. Thus, for some low power single-stage battery applications, the existing overall solution is not compact enough to be effective.
Meanwhile, for many wireless charging devices, wired charging access options still need to be considered, so as to ensure that the charging function can still be completed without the wireless charging devices. Fig. 2 shows a typical solution adopted at present, which requires two external reverse-biased isolating switches, and increases the cost and volume of the equipment. In addition, when an external power supply is used, the wireless receiving chip needs to be turned off, so that the effective utilization rate of the chip is insufficient.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a high integrated linear voltage stabilizing circuit that charges and contain this high integrated linear voltage stabilizing circuit that charges's charging circuit that is applicable to low power equipment to solve current charging circuit's that is used for low power equipment structure succinct inadequately and can not support the problem of line power supply or wireless power supply in a flexible way.
In order to solve the technical problem, the utility model provides a high integrated linear voltage stabilizing circuit that charges is provided in the first aspect, and this high integrated linear voltage stabilizing circuit that charges includes:
a wired power supply input coupled to a wired power supply;
a power supply output coupled to a load;
the rectifier module is coupled with the output end of the wireless receiving coil and converts electromagnetic energy induced by the wireless receiving coil into direct current for output;
an intermediate node coupled to an output of the rectification module;
a linear charging voltage regulator module coupled to the intermediate node and the power supply output terminal, the linear charging voltage regulator module performing a linear charging mode according to a first instruction input by a user or performing a linear voltage regulation output mode according to a second instruction input by the user;
and the power supply self-switching module is coupled with the wired power supply input end and the intermediate node, and when the wired power supply input end has voltage input and the voltage is between a first voltage threshold and a second voltage threshold, the power supply self-switching module closes the rectifying module so that the linear charging voltage stabilizing module is switched from a wireless power supply mode to a wired power supply mode.
Preferably, the high-integration linear charging voltage stabilizing circuit further comprises a control module, and the control module controls the linear charging voltage stabilizing module to provide a linear charging mode for the battery type load according to a first instruction input by a user, or controls the linear charging voltage stabilizing module to provide a linear voltage stabilizing output mode for the non-battery type load according to a second instruction input by the user.
Preferably, the linear charging voltage stabilizing module comprises a variable impedance unit coupled with the intermediate node and the power supply output terminal, and a linear charging voltage stabilizing unit coupled with the control module; the linear charging voltage stabilizing unit adjusts the impedance of the variable impedance unit according to an execution linear charging mode instruction output by the control module to realize pre-charging, constant current charging or constant voltage charging of the battery type load, or adjusts the impedance of the variable impedance unit according to an execution linear voltage stabilizing output mode instruction output by the control module to realize constant voltage charging of the non-battery type load.
More preferably, the variable impedance unit is a power tube with adjustable impedance.
More preferably, the linear charging voltage regulator module further includes a current detection unit, configured to detect a circuit current between the intermediate node and the power supply output terminal in real time, and transmit the detected current value to the control module, so that the control module outputs control information of normal operation, increasing the output current, limiting the output current, or turning off the circuit to the linear charging voltage regulator unit according to the current value.
Preferably, the control module comprises a control unit coupled with the rectifying module and the linear charging voltage stabilizing module, and an ASK load modulator connected with the control unit; the control unit establishes communication with a wireless transmitting terminal through the ASK load modulator to control the wireless transmitting terminal to adjust output power.
Preferably, the power self-switching module comprises a power detection and self-switching unit and a first switching unit coupled with the wired power input end and the intermediate node; when the power supply detection and self-switching unit detects that the voltage input is at the input end of the wired power supply and the voltage is between the first voltage threshold and the second voltage threshold, the rectification module is closed and the first switch unit is controlled to be switched on, so that the linear charging voltage stabilization module is switched from a wireless power supply mode to a wired power supply mode.
Preferably, the rectification module is a synchronous full-wave rectification circuit; and/or
The first switch unit is a switch power tube.
Preferably, the high-integration linear charging voltage stabilizing circuit further comprises a protection module, wherein the protection module comprises a voltage detection and protection unit and a second switch unit coupled with the intermediate node and the linear charging voltage stabilizing module; the voltage detection and protection unit detects the voltage value of the intermediate node in real time and feeds the detected voltage value back to the control module, so that the control module outputs control information for controlling the second switch unit to be switched on or switched off according to the voltage value.
In order to further solve the above technical problem, a second aspect of the present invention provides a charging circuit for low power device, the charging circuit supports two modes of wireless power supply and wired power supply, and the charging circuit includes:
the output end of the wireless receiving coil is coupled with the input end of the rectifying module, and the wireless receiving coil induces electromagnetic energy of the wireless transmitting coil;
the high-integration linear charging voltage stabilizing circuit is provided.
Compared with the prior art, the highly integrated linear charging voltage stabilizing circuit provided by the utility model can flexibly support a wired power supply or wireless power supply mode, and simultaneously realize a linear charging function or a linear voltage stabilizing output function with less external component requirements; the utility model provides a charging circuit who contains this high integrated linear voltage stabilizing circuit that charges can be used for providing linear charge mode or providing linear voltage stabilization output mode to non-battery class load to battery class load, is applied to it and can greatly reduce the product volume or the size of charging in the low power equipment charging product, reduces battery charging outfit's cost, has more extensive application in wireless charging field.
Drawings
Fig. 1 is a block diagram of a wireless charging circuit provided in the prior art.
Fig. 2 is a block diagram of a charging circuit supporting wired charging function provided in the prior art.
Fig. 3 is a block diagram illustrating a first highly integrated linear charging voltage stabilizing circuit according to an embodiment of the present invention.
Fig. 4 is a block diagram illustrating a second highly integrated linear charging voltage stabilizing circuit according to an embodiment of the present invention.
Fig. 5 is a block diagram illustrating a third highly integrated linear charging voltage stabilizing circuit according to an embodiment of the present invention.
Fig. 6 is a block diagram illustrating a fourth highly integrated linear charging voltage stabilizing circuit according to an embodiment of the present invention.
Fig. 7 is a block diagram illustrating a fifth highly integrated linear charging voltage stabilizing circuit according to an embodiment of the present invention.
Fig. 8 is a block diagram illustrating a sixth highly integrated linear charging voltage stabilizing circuit according to an embodiment of the present invention.
Fig. 9 is a block diagram illustrating a seventh highly integrated linear charging voltage stabilizing circuit according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a highly integrated linear charging voltage stabilizing circuit according to an embodiment of the present invention.
Fig. 11 is a block diagram of a charging circuit for a low power device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to make the description of the present disclosure more complete and complete, the following description is given for illustrative purposes with respect to the embodiments and specific examples of the present invention; it is not intended to be the only form in which the embodiments of the invention may be practiced or utilized. The embodiments are intended to cover the features of the various embodiments as well as the method steps and sequences for constructing and operating the embodiments. However, other embodiments may be utilized to achieve the same or equivalent functions and step sequences.
In order to reduce the volume or the size of the product of charging for low power equipment, the utility model discloses the first aspect provides a high integrated linear voltage stabilizing circuit that charges, please refer to that fig. 3 shows the utility model discloses a high integrated linear voltage stabilizing circuit that charges's that the embodiment provides a block diagram shows this high integrated linear voltage stabilizing circuit that charges in the picture includes: the wireless receiving coil comprises a wired power supply input end coupled with a wired power supply, a power supply output end coupled with a load, a rectifying module 1 coupled with the output end of the wireless receiving coil, an intermediate node coupled with the output end of the rectifying module 1, a linear charging voltage stabilizing module 3 coupled with the intermediate node and the power supply output end, and a power supply self-switching module 2 coupled with the wired power supply input end and the intermediate node. The rectifier module 1 is used for converting electromagnetic energy induced by the wireless receiving coil into direct current and outputting the direct current; the linear charging voltage stabilizing module 3 is configured to execute a linear charging mode according to a first instruction input by a user when the power supply output end is coupled with the battery type load and execute a linear voltage stabilizing output mode according to a second instruction input by the user when the power supply output end is coupled with the non-battery type load; the power supply self-switching module 2 is configured to automatically turn off the rectifying module 1 when detecting that the wired power supply input end has voltage input and the voltage is between the first voltage threshold and the second voltage threshold, so that the output end of the rectifying module 1 is in a high-impedance state, and the linear charging voltage stabilizing module 3 automatically switches from the wireless power supply mode to the wired power supply mode. The circuit can flexibly support a wired power supply or wireless power supply mode, and integrates a linear charging function and a linear voltage-stabilizing output function on one chip, so that the linear charging function or the linear voltage-stabilizing output function is realized with fewer external component requirements.
In the art, the first voltage threshold and the second voltage threshold are respectively the under-voltage value (V)UVLO) And overpressure value (V)OVP) For example, when the voltage value of the wired power input terminal must be greater than the set under-voltage value, otherwise the subsequent circuit cannot be started; and must be less than the set over-voltage level or the subsequent circuitry may be burned.
Referring to fig. 4, based on the above embodiment, in another embodiment, the high integrated linear charging voltage stabilizing circuit further includes a control module 4, where the control module 4 is embedded in the high integrated linear charging voltage stabilizing circuit and controls the operation of the whole circuit, including being configured to control the linear charging voltage stabilizing module 3 to execute the linear charging mode when a first instruction is input by a user and to control the linear charging voltage stabilizing module 3 to execute the linear voltage stabilizing output mode when a second instruction is input by the user.
Referring to fig. 5, based on the above embodiment, in another embodiment, the linear charging voltage stabilizing module 3 includes a variable impedance unit 32 coupled to the intermediate node and the power supply output terminal, and a linear charging voltage stabilizing unit 31 coupled to the control module 4, where the linear charging voltage stabilizing unit 31 is configured to adjust the impedance of the variable impedance unit 32 to implement pre-charging, constant current charging, or constant voltage charging on the battery-like load when the control module 4 outputs a command to execute the linear charging mode; and when the instruction output by the control module 4 is to execute the linear voltage stabilization output mode, adjusting the impedance of the variable impedance unit 32 to realize the constant voltage charging of the non-battery load.
In the technical field, any suitable electronic component may be selected as the variable impedance unit in this embodiment, for example, in some embodiments of the present invention, the variable impedance unit is a switching power transistor, and the impedance of the power transistor is adjusted by adjusting the size of the power transistor, so as to achieve the purpose of turning on the circuit, or turning off the circuit, or increasing the output current, or limiting the output current.
Referring to fig. 6, based on the above embodiment, in other embodiments, the linear charging voltage regulator module 3 further includes a current detection unit 33 for detecting a circuit current between the intermediate node and the power supply output terminal in real time and transmitting the detected current value to the control module 4; the control module 4 outputs control information of normal operation, increasing output current, limiting output current or breaking a circuit to the linear charging voltage stabilizing unit 31 according to the current value; then the linear charging voltage stabilizing unit 31 works normally according to the received control information, or adjusts the impedance of the variable impedance unit 32 to realize increasing the output current, or limiting the output current, or breaking the circuit. The current detection unit 33 can prevent the occurrence of conditions of damaging chips and batteries such as overcurrent or short circuit in the charging process, specifically, the current detection unit 33 detects the circuit current between the intermediate node and the power supply output end in real time, the control module 4 judges whether the overcurrent or short circuit phenomenon occurs according to the current value detected by the current detection unit 33, and if the overcurrent occurs, the control module 4 outputs control information for limiting the output current or breaking the circuit to the linear charging voltage stabilization unit 31; if a short circuit condition occurs, the control module 4 outputs control information for opening the circuit to the linear charging voltage stabilization unit 31. More specifically, if the short circuit or overcurrent phenomenon does not occur and the linear charging regulator unit 31 performs the linear charging mode, the control module 4 determines whether the current value is within a current value range set by the pre-charging, or the constant current charging, or the constant voltage charging, based on the current value detected by the current detection unit 33, and if so, the control module 4 outputs control information for normal operation to the linear charging regulator unit 31, and if not, the control module 4 outputs control information for increasing the output current or limiting the output current to the linear charging regulator unit 31. More specifically, if the short circuit or overcurrent phenomenon does not occur and the linear charging regulator unit 31 performs the linear regulator output mode, the control module 4 determines whether the current value is within a current value range set for constant voltage charging according to the current value detected by the current detection unit 33, and if the current value is within the set range, the control module 4 outputs control information for normal operation to the linear charging regulator unit 31, and if not, the control module 4 outputs control information for increasing the output current or limiting the output current to the linear charging regulator unit 31.
On the basis of the above embodiment, in other embodiments, the linear charging voltage stabilizing module 3 further includes a time judging unit (not shown in the figure) configured to count the total time of the constant voltage charging phase when the linear charging voltage stabilizing unit 31 performs the linear charging mode, and indicate that the charging of the battery-like load has been completed when the total time is greater than the first time threshold, and thus output control information for turning off the circuit to the linear charging voltage stabilizing unit 31; the linear charging voltage stabilization unit 31 adjusts the impedance of the variable impedance unit 32 according to the control information to realize the open circuit. In this technical field, the first time threshold can be set manually, and average time data after a battery type load charging test based on a certain amount can be adopted as the first time threshold under general conditions to play a role in protecting the battery, and meanwhile, the linear charging voltage stabilizing unit 31 adjusts the impedance of the variable impedance unit 32 to disconnect the circuit, so that the intermediate node and the power supply output end can be isolated, and the battery current can be prevented from flowing backwards.
Referring to fig. 7, based on the above embodiment, in another embodiment, the control module 4 includes a control unit 41 coupled to the rectifying module 1 and the linear charging and voltage stabilizing module 3, and an ASK load modulator 42 connected to the control unit 41, where the control unit 41 may be an MCU or a digital logic control system, and the control unit 41 establishes communication with the wireless transmitting end through the ASK load modulator to control the wireless transmitting end to adjust the output power. Therefore, the utility model provides a high integration linear charging voltage stabilizing circuit can define the best voltage output range (corresponding to the voltage value at the middle node of fig. 7) according to the required voltage size of different loads (including battery class load and non-battery class load), if this voltage value is not in corresponding scope, control unit 41 can require wireless transmitting terminal to adjust output power through ASK load modulator 42 to make the voltage value at middle node keep in the best voltage range, especially improve the overall efficiency when linear charging voltage stabilizing module 3 carries out linear voltage stabilizing output mode.
Referring to fig. 8, based on the above embodiment, in another embodiment, the power self-switching module 2 includes a power detection and self-switching unit 21 and a first switching unit 22 coupled to the wired power input end and the intermediate node, the power detection and self-switching unit 21 is configured to, when it is detected that the wired power input end has a voltage input and the voltage is between a first voltage threshold and a second voltage threshold, turn off the rectifying module 1, make the output end of the rectifying module 1 in a high impedance state, and control the first switching unit 22 to be turned on, i.e., to form a path through the wired power input end to the intermediate node, and the linear charging voltage stabilizing module 3 automatically switches from the wireless power supply mode to the wired power supply mode. In the technical field, any suitable electronic component can be selected as the first switch unit 22 in this embodiment, for example, in some embodiments of the present invention, the first switch unit 22 is a switching power transistor, and the impedance of the power transistor is adjusted by adjusting the size of the power transistor, so as to achieve the purpose of turning on or off the circuit.
According to the utility model discloses a some embodiments, the rectifier module can adopt any known rectifier circuit that has now in this field to realize, for example adopts full integrated synchronous full wave rectifier circuit or half-wave rectifier circuit, compares in asynchronous diode rectification mode, can greatly improve rectification efficiency, reduces the calorific capacity of chip, reduces the heat treatment cost of chip or product.
Referring to fig. 9, based on the above embodiments, in other embodiments, the highly integrated linear charging voltage regulator circuit further includes a protection module 5, where the protection module 5 includes a voltage detection and protection unit 51 and an intermediate nodeA second switching unit 52 coupled to the variable impedance unit 32, wherein the voltage detection and protection unit 51 is configured to detect a voltage value at the intermediate node in real time, feed the detected voltage value back to the control module 4, and then control the second switching unit 52 to be turned on or off according to control information for controlling the second switching unit 52 to be turned on or off, which is output by the control module 4; specifically, the control module 4 determines whether the voltage value detected by the voltage detection and protection unit 51 is between a third voltage threshold and a fourth voltage threshold, and if the voltage value is between the third voltage threshold and the fourth voltage threshold, outputs control information for controlling the second switch unit 52 to be turned on to the voltage detection and protection unit 51, and starts a subsequent circuit; if the voltage value is smaller than the third voltage threshold, outputting control information for controlling the second switch unit 52 to be turned off to the voltage detection and protection unit 51, and simultaneously turning off the subsequent circuit; if the voltage value is greater than the fourth voltage threshold, the control module 4 controls the voltage detection and protection unit 51 to pull down the voltage value at the intermediate node to keep it lower than the fourth voltage threshold. In the art, the third voltage threshold and the fourth voltage threshold are respectively the under-voltage value (V)UVLO) And overpressure value (V)OVP) For example, when the voltage value at the intermediate node must be greater than the set under-voltage value, otherwise the subsequent circuit cannot be started; and must be less than the set over-voltage level or the subsequent circuitry may be burned. In the present technical field, any suitable electronic component can be selected as the second switch unit 52 in this embodiment, for example, in some embodiments of the present invention, the second switch unit 52 is a switching power transistor, and the impedance of the power transistor is adjusted by adjusting the size of the power transistor, so as to achieve the purpose of turning on or off the circuit.
When the linear charging of the battery load is completed, the second switch unit 52 and the variable impedance unit 32 are both in the state of breaking the circuit, so as to isolate the intermediate node from the power supply output terminal and prevent the battery current from flowing backwards. When the linear voltage stabilization output mode is provided to the non-battery load, the second switching unit 52 is always kept in the conducting state, and the linear charging voltage stabilization unit 31 adjusts the impedance of the variable impedance unit 32 to perform the constant voltage charging to the non-battery load.
On the basis of the above embodiment, in other embodiments, the protection module 5 further includes a first temperature detection unit (not shown in the figure) and a second temperature detection unit (not shown in the figure), wherein the first temperature detection unit is configured to detect the temperature of the internal overall circuit in real time, feed back the detected temperature value to the control module 4, and then control the second switch unit 52 to be turned on or off according to the control information for controlling the second switch unit 52 to be turned on or off, which is output by the control module 4; the second temperature detection unit is configured to detect the temperature of the external load in real time, feed back the detected temperature value to the control module 4, and then control the linear charging voltage stabilization module 3 to normally operate or close according to the control information for controlling the linear charging voltage stabilization module 3, which is output by the control module 4.
The current detection units 33 in the protection module 5 and the linear charging voltage stabilization module 3 are used for detecting the temperature, voltage and current of the chip and the battery in the charging process, so as to prevent the chip and the battery from being damaged by over-temperature, low-temperature, overvoltage, undervoltage, overcurrent, short circuit and the like. For example, when the temperature exceeds a certain set value, the linear charging regulator unit 31 first reduces the charging current by increasing the impedance of the variable impedance unit 32, and if the temperature continues to rise to the warning value, the control module 4 will turn off the second switch unit 52 and turn off the linear charging regulator module 3 to interrupt the charging process.
Please refer to fig. 10, fig. 10 is a schematic diagram of a structure of a highly integrated linear charging voltage stabilizing circuit according to an embodiment of the present invention, the highly integrated linear charging voltage stabilizing circuit mainly includes a synchronous rectification module (corresponding to a synchronous rectification control unit in the diagram), a linear charging voltage stabilizing module, a power detection and automatic switching module, and a control and protection module (including a MCU or a digital logic control system in the diagram, ASK load modulation communication, voltage detection and protection, output current detection, external battery temperature detection, internal chip temperature detection, etc.), and the following explains specific working processes of the modules with reference to fig. 10.
The synchronous rectification module adopts a fully integrated synchronous full-wave rectification circuitThe input end of the rectification circuit is coupled with the output ends (AC1, AC2) of the wireless receiving coil, and the synchronous full-wave rectification circuit comprises a control unit, four high-voltage power tubes (M1, M2, M3, M4) connected with the control unit, and C connected with the high-voltage power tubesRECTThe capacitor has the following specific rectifying process: when AC1>When the AC2 is detected, the control unit drives the high-voltage power tubes M2 and M3 to be turned on, and the current pair C is conductedRECTCharging a capacitor; when AC1<When the AC2 is detected, the control unit drives the high-voltage power tubes M1 and M4 to be turned on, and the current pair C is conductedRECTCharging a capacitor; the capacitor is thus charged during the entire cycle, forming a so-called full-wave rectifier circuit. Due to the absence of asynchronous diode threshold voltage (V)TH0.7V), the operating state of M1-M4 approaches the ideal diode (V)TH0). When the charging current is charged through the power tubes M1-M4, the power mainly lost depends on the on-resistance of M1-M4 and the current magnitude (such as P)LOSS＝ICH 2RDSON). Therefore, power loss can be reduced by increasing the tube size of M1-M4. Compared with an asynchronous diode rectification scheme, the full-wave rectification circuit has the advantages that the efficiency is greatly improved, the heat productivity of a chip is further reduced, and the heat treatment cost of the chip or a product is reduced.
Further, when the synchronous rectification module performs a synchronous full-wave rectification mode, the electromagnetic energy induced by the wireless receiving coil is converted into a direct-current voltage (corresponding to V in fig. 10) for outputRECT) Certain conditions must be met: e.g. must be greater than a set under-voltage value (V)UVLO) Otherwise, the subsequent circuit can not be started; must be smaller than the set overpressure value (V)OVP) Otherwise, subsequent circuits may be burned; when V isRECTAfter the establishment, according to the requirements of the WPC or Qi protocol, the wireless receiving end device needs to establish protocol connection or handshake with the wireless transmitting end device through ASK load modulation communication. Establishing stable communication is an important prerequisite for the receiving end and the transmitting end to work normally.
Further, when VRECTAfter the stable voltage is established, the linear charging voltage stabilizing module can adjust the output mode according to the load condition. Specifically, the linear charging voltage-stabilizing module comprises a linearThe linear charging or voltage-stabilizing control unit can adjust the size of the switching power tube Q2 to adjust the impedance of the switching power tube Q2, and finally the purposes of conducting a circuit, increasing the output current, limiting the output current or disconnecting the circuit are achieved. More specifically, with the above structure, the output mode of the linear charging voltage regulator module includes: a linear charging Mode (LinearCharger Mode) is provided for battery-type loads, or a linear regulated output Mode (LDO Mode) is provided for non-battery-type loads.
More specifically, when the linear charging voltage regulator module starts charging the battery load, the period of time is according to the condition of the battery residual capacity: when the electric quantity is lower than a certain set value, pre-charging is carried out through trickle to prevent the battery from being damaged; when the electric quantity is higher than a certain set value, entering a rapid Constant Current (CC) charging stage; when the voltage of the battery is further higher than a certain set value, entering a slow Constant Voltage (CV) charging stage; after the constant voltage charging is carried out for a certain set time, the battery charging is finished and quit, thereby playing the role of protecting the battery. Meanwhile, the temperature, the voltage and the current of the chip and the battery are detected in the charging process, so that the conditions of damaging the chip and the battery, such as over-temperature, low temperature, overvoltage, undervoltage, overcurrent, short circuit and the like, are prevented. For example, when the temperature exceeds a certain set value, the charging current is first reduced, and if the temperature continues to rise to an early warning value, the system interrupts the charging process. When the battery is charged, the switching power tubes Q1 and Q2 are turned off, so that the effect of isolating the battery output OUT from the RECT end is achieved, and the current of the battery is prevented from flowing backwards. When V isOUTBelow VRECTIn time, the charging process will continue, otherwise the charging process ends.
More specifically, when the linear charging voltage-stabilizing control module starts to provide a constant output voltage to the non-battery load, the linear charging voltage-stabilizing control module defines an optimal V according to the current magnitude required by different non-battery loadsRECTValue range if VRECTThe value is not in the corresponding range, the receiving end can require the transmitting end to dynamically adjust the output power through the ASK load modulation communication protocol, so that V is enabledRECTKept at optimum powerVoltage range, thereby increasing the overall efficiency of the LDO mode. Meanwhile, the temperature, the voltage and the current in the chip are detected in real time, and the conditions of over-temperature, over-voltage, over-current, short circuit or the like which damage the chip are prevented. When entering the linear voltage stabilization output mode, the switching power transistor Q1 is always kept in the conducting state, and the linear charging or voltage stabilization control unit adjusts the size of the switching power transistor Q2 to enter the linear voltage stabilization state (i.e., the constant voltage charging process).
The power supply detection and automatic switching module comprises a power supply detection and automatic switching unit and a switching power tube Q0; when the input of the wired power supply (VBUS) is detected and the voltage is between a set certain overvoltage (V)OVP) Value and some undervoltage (V)UVLO) Between values, the power detection and automatic switching unit will automatically turn off the synchronous rectification control module, so that the output is in a high impedance state. Meanwhile, the switching power tube Q0 is turned on to conduct the VBUS end and the RECT end to form a channel, and the linear charging or voltage stabilizing control module is automatically switched to a wired power supply mode.
The control and protection circuit mainly comprises ASK load modulation communication, and control or protection of temperature (high/low), voltage (overvoltage/undervoltage) and current (overcurrent/short circuit) of a chip or a battery. The control and protection circuit is embedded into the whole process of wired or wireless charging or voltage stabilization, and plays an important role in chip function and safety.
In order to further solve the above technical problem, a second aspect of the present invention provides a charging circuit for low power devices, please refer to fig. 11, the charging circuit supports two modes of wireless power supply and wired power supply, and the charging circuit includes: the wireless receiving coil with the output end coupled with the input end of the rectifying module and the high-integration linear charging voltage stabilizing circuit are used for inducing electromagnetic energy of the wireless transmitting coil. In order to further solve the above technical problem, the third aspect of the present invention provides an application of the above charging circuit, wherein the charging circuit is used for performing linear charging on a battery type load, or outputting a stable voltage to a non-battery type load, and applying the charging circuit to a low power device charging product can greatly reduce the volume or size of the charging product, reduce the cost of the charging device, and have a wider application in the wireless charging field.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a high integration linear charging voltage stabilizing circuit, its characterized in that, high integration linear charging voltage stabilizing circuit includes:
a wired power supply input coupled to a wired power supply;
a power supply output coupled to a load;
the rectifier module is coupled with the output end of the wireless receiving coil and converts electromagnetic energy induced by the wireless receiving coil into direct current for output;
an intermediate node coupled to an output of the rectification module;
a linear charging voltage regulator module coupled to the intermediate node and the power supply output terminal, the linear charging voltage regulator module performing a linear charging mode according to a first instruction input by a user or performing a linear voltage regulation output mode according to a second instruction input by the user;
and the power supply self-switching module is coupled with the wired power supply input end and the intermediate node, and when the wired power supply input end has voltage input and the voltage is between a first voltage threshold and a second voltage threshold, the power supply self-switching module closes the rectifying module so that the linear charging voltage stabilizing module is switched from a wireless power supply mode to a wired power supply mode.
2. The highly integrated linear charging voltage regulator circuit of claim 1, further comprising a control module that controls the linear charging voltage regulator module to provide a linear charging mode for a battery-type load according to a first command input by a user, or controls the linear charging voltage regulator module to provide a linear voltage-regulated output mode for a non-battery-type load according to a second command input by a user.
3. The highly integrated linear charging voltage regulation circuit of claim 2 wherein the linear charging voltage regulation module comprises a variable impedance unit coupled to the intermediate node and the supply output, and a linear charging voltage regulation unit coupled to the control module; the linear charging voltage stabilizing unit adjusts the impedance of the variable impedance unit according to an execution linear charging mode instruction output by the control module to realize pre-charging, constant current charging or constant voltage charging of the battery type load, or adjusts the impedance of the variable impedance unit according to an execution linear voltage stabilizing output mode instruction output by the control module to realize constant voltage charging of the non-battery type load.
4. The highly integrated linear charging voltage regulator circuit of claim 3, wherein the variable impedance unit is a power transistor with adjustable impedance.
5. The highly integrated linear charging voltage regulator circuit of claim 3, wherein the linear charging voltage regulator module further comprises a current detection unit for detecting a circuit current between the intermediate node and the power supply output terminal in real time and transmitting the detected current value to the control module, so that the control module outputs control information for normal operation, increasing the output current, limiting the output current, or disconnecting the circuit to the linear charging voltage regulator unit according to the current value.
6. The highly integrated linear charging voltage regulator circuit of claim 2, wherein the control block includes a control unit coupled to the rectifier block and the linear charging voltage regulator block, and an ASK load modulator connected to the control unit; the control unit establishes communication with a wireless transmitting terminal through the ASK load modulator to control the wireless transmitting terminal to adjust output power.
7. The highly integrated linear charging voltage regulator circuit of claim 1, wherein the power self-switching module comprises a power detection and self-switching unit, and a first switching unit coupled to the wired power input and the intermediate node; when the power supply detection and self-switching unit detects that the voltage input is at the input end of the wired power supply and the voltage is between the first voltage threshold and the second voltage threshold, the rectification module is closed and the first switch unit is controlled to be switched on, so that the linear charging voltage stabilization module is switched from a wireless power supply mode to a wired power supply mode.
8. The highly integrated linear charging voltage regulator circuit of claim 7, wherein the rectification module is a synchronous full wave rectification circuit; and/or
The first switch unit is a switch power tube.
9. The high integrated linear charging voltage regulator circuit of claim 2, further comprising a protection module comprising a voltage detection and protection unit, and a second switching unit coupled with the intermediate node and the linear charging voltage regulator module; the voltage detection and protection unit detects the voltage value of the intermediate node in real time and feeds the detected voltage value back to the control module, so that the control module outputs control information for controlling the second switch unit to be switched on or switched off according to the voltage value.
10. A charging circuit for a low power device, the charging circuit supporting both wireless power and wired power modes, the charging circuit comprising:
the output end of the wireless receiving coil is coupled with the input end of the rectifying module, and the wireless receiving coil induces electromagnetic energy of the wireless transmitting coil;
the highly integrated linear charging voltage regulator circuit of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920637028.4U CN210074886U (en) | 2019-05-06 | 2019-05-06 | High integration linear charging voltage stabilizing circuit and charging circuit for low power device |
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| CN201920637028.4U CN210074886U (en) | 2019-05-06 | 2019-05-06 | High integration linear charging voltage stabilizing circuit and charging circuit for low power device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224497A (en) * | 2019-05-06 | 2019-09-10 | 南京睿赫电子有限公司 | A kind of highly integrated linear-charging voltage regulator circuit and its application |
| CN115657573A (en) * | 2022-12-28 | 2023-01-31 | 济钢防务技术有限公司 | Low-altitude flight body identification controller |
-
2019
- 2019-05-06 CN CN201920637028.4U patent/CN210074886U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224497A (en) * | 2019-05-06 | 2019-09-10 | 南京睿赫电子有限公司 | A kind of highly integrated linear-charging voltage regulator circuit and its application |
| CN115657573A (en) * | 2022-12-28 | 2023-01-31 | 济钢防务技术有限公司 | Low-altitude flight body identification controller |
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Address after: Room 101-8, block B, animation building, No. 11, Xinghuo Road, Jiangbei new district, Nanjing, Jiangsu Province Patentee after: NANJING RUIHE ELECTRONICS Co.,Ltd. Address before: 210043 Buyue Road, 29 Qiaolin Street, Pukou District, Nanjing City, Jiangsu Province, 12-293 Patentee before: NANJING RUIHE ELECTRONICS Co.,Ltd. |