CN110707945A

CN110707945A - Rectifier circuit, wireless charging device, power supply equipment and wireless charging system

Info

Publication number: CN110707945A
Application number: CN201810750266.6A
Authority: CN
Inventors: 杨冬笋
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-07-10
Filing date: 2018-07-10
Publication date: 2020-01-17
Also published as: WO2020010969A1

Abstract

The application discloses rectifier circuit, wireless charging device, power provide equipment and wireless charging system, wherein, rectifier circuit includes: the alternating current input end receives input alternating current; the direct current output end outputs direct current; the first pole of the MOS tube is connected with the alternating current input end, and the second pole of the MOS tube is connected with the direct current output end; the controllable switch unit is connected with the control electrode of the MOS tube; the comparison unit is used for comparing alternating current input by the alternating current input end with direct current output by the direct current output end, and controlling the MOS tube to be conducted or disconnected through the controllable switch unit according to a comparison result so as to perform half-wave rectification on the alternating current, so that the half-wave rectification is realized through the MOS tube, the loss can be reduced, the heating is reduced, the efficiency is improved, particularly the loss and the heating under a heavy-current load are reduced, and the circuit is simple and low in cost.

Description

Rectifier circuit, wireless charging device, power supply equipment and wireless charging system

Technical Field

The application relates to the technical field of charging, in particular to a rectifying circuit, a wireless charging device, a power supply providing device and a wireless charging system.

Background

In the related art, half-wave rectification is generally realized by a single diode. However, the inventor of the present application has found that the diode has a large forward voltage drop Vf, and even in a low-dropout schottky diode, Vf is greater than 0.4V, and further, the loss is large and heat generation is serious under a large current load.

Disclosure of Invention

The present application is directed to solving, at least to some extent, one of the technical problems in the related art.

To this end, a first object of the present application is to provide a rectifier circuit to realize low-loss, low-cost half-wave rectification.

A second objective of the present application is to provide a wireless charging device.

A third object of the present application is to provide a power supply apparatus.

A fourth objective of the present application is to provide a wireless charging system.

A fifth object of the present application is to propose another wireless charging system.

To achieve the above object, an embodiment of a first aspect of the present application provides a rectifier circuit, including: an AC input terminal receiving an input AC power; a DC output terminal, which outputs DC; the first pole of the MOS tube is connected with the alternating current input end, and the second pole of the MOS tube is connected with the direct current output end; the controllable switch unit is connected with the control electrode of the MOS tube; and the comparison unit is connected with the alternating current input end, the direct current output end and the controllable switch unit, and is used for comparing alternating current input by the alternating current input end with direct current output by the direct current output end and controlling the MOS tube to be switched on or switched off through the controllable switch unit according to a comparison result so as to perform half-wave rectification on the alternating current.

According to the rectifier circuit that this application embodiment provided, MOS pipe is connected between AC input end and DC output, and the comparison unit compares AC input's the direct current of DC output input with AC input to the comparison unit to through the controllable switch unit control MOS pipe turn-on or turn-off according to the comparison result, with carry out half-wave rectification to the alternating current, thereby realize half-wave rectification through the MOS pipe, can reduce the loss, reduce and generate heat, raise the efficiency, especially reduce loss and generate heat under the heavy current load. In addition, the rectifying circuit does not need a special control chip of a synchronous rectifying scheme, and is simple in circuit and low in cost.

According to an embodiment of the application, the comparison unit comprises: the positive input end of the comparator is connected with the alternating current input end, the negative input end of the comparator is connected with the direct current output end, the output end of the comparator is connected with the controllable switch unit, the comparator is used for controlling the MOS tube to be conducted through the controllable switch unit when the voltage of the alternating current input end is greater than the voltage of the direct current output end, and controlling the MOS tube to be turned off through the controllable switch unit when the voltage of the alternating current input end is less than the voltage of the direct current output end.

According to an embodiment of the application, the comparing unit further comprises: and one end of the first resistor is connected with the positive input end of the comparator, and the other end of the first resistor is connected with the output end of the comparator.

According to one embodiment of the application, the MOS tube is a P-channel MOS tube.

According to an embodiment of the application, the controllable switching unit comprises; and the base electrode of the triode is connected with the comparison unit, the collector electrode of the triode is connected with the control electrode of the MOS, and the emitting electrode of the triode is grounded.

According to an embodiment of the present application, the rectifier circuit further includes: and one end of the second resistor is connected with the control electrode of the MOS tube, and the other end of the second resistor is connected with the second electrode of the MOS tube.

In order to achieve the above object, a wireless charging device according to an embodiment of a second aspect of the present application includes: the rectification filter circuit comprises the rectification circuit, wherein alternating current provided by power supply equipment is converted into direct current through the rectification circuit; the wireless transmitting circuit comprises an electromagnetic coil and is used for converting the direct current into alternating current which can be coupled to the transmitting coil and converting the alternating current which can be coupled to the transmitting coil into an electromagnetic signal through the transmitting coil for transmission.

According to the wireless charging device provided by the embodiment of the present application, the loss and the heat generation, particularly under a large current load, can be reduced and the cost can be reduced by the rectifier circuit of the first aspect.

According to an embodiment of the present invention, the first control circuit communicates with a device to be charged to receive a charging parameter fed back by the device to be charged, and the first control circuit further adjusts the transmission power of the wireless transmission circuit according to the charging parameter fed back by the device to be charged.

According to an embodiment of the present invention, the first control circuit communicates with a device to be charged to receive power transmission efficiency information fed back by the device to be charged, and the first control circuit further determines an adjustment amplitude of the transmission power of the wireless transmission circuit according to the power transmission efficiency information.

According to an embodiment of the invention, the first control circuit communicates with the device to be charged to receive battery temperature information fed back by the device to be charged, and the first control circuit reduces the transmission power of the wireless transmission circuit when judging that the temperature of the battery exceeds a preset temperature threshold according to the battery temperature information.

According to an embodiment of the present invention, the wireless charging apparatus further includes: and the voltage conversion circuit is used for performing voltage conversion on the direct current provided for the wireless transmitting circuit when the voltage of the direct current provided for the wireless transmitting circuit does not meet a preset condition.

In order to achieve the above object, a power supply device according to an embodiment of a third aspect of the present application includes: the charging interface is connected with the wireless charging device; the rectifying circuit converts alternating current provided by the alternating current power supply into direct current to provide the direct current for the wireless charging device.

According to the power supply device provided by the embodiment of the present application, the rectifier circuit of the first aspect can reduce loss and heat generation, especially under a large current load, and can reduce cost.

In order to achieve the above object, a wireless charging system according to a fourth aspect of the present application includes: a power supply device for supplying alternating current; the wireless charging device is used for converting the alternating current provided by the power supply equipment into an electromagnetic signal so as to transmit power in a wireless mode; and the equipment to be charged converts the electromagnetic signal transmitted by the wireless charging device into alternating current and converts the alternating current into direct current so as to charge a battery.

According to the wireless charging system provided by the embodiment of the present application, the loss and the heat generation, particularly under a large current load, can be reduced, and the cost can be reduced by the wireless charging device of the embodiment of the second aspect.

In order to achieve the above object, an embodiment of a fifth aspect of the present application provides another wireless charging system, including: the power supply device is used for converting alternating current into direct current; the wireless charging device is used for converting the direct current provided by the power supply equipment into an electromagnetic signal so as to transmit power in a wireless mode; and the equipment to be charged converts the electromagnetic signal transmitted by the wireless charging device into alternating current and converts the alternating current into direct current so as to charge a battery.

According to the wireless charging system provided by the embodiment of the application, the loss and the heat generation can be reduced, particularly under the condition of large-current load, through the power supply device provided by the embodiment of the third aspect, and the cost can also be reduced.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a block schematic diagram of a rectifier circuit according to an embodiment of the present application;

FIG. 2 is a circuit schematic of a rectifier circuit according to one embodiment of the present application;

fig. 3 is a block schematic diagram of a wireless charging device according to an embodiment of the present application;

FIG. 4 is a block schematic diagram of a power supply apparatus according to an embodiment of the present application;

fig. 5 is a block schematic diagram of a wireless charging system according to one embodiment of the present application;

fig. 6 is a block schematic diagram of a wireless charging system according to another embodiment of the present application;

fig. 7 is a block diagram illustrating a wireless charging device in a wireless charging system according to an embodiment of the present application;

fig. 8 is a block diagram of a device to be charged in a wireless charging system according to an embodiment of the present application;

fig. 9 is a block diagram of a device to be charged in a wireless charging system according to another embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

A rectifier circuit, a wireless charging device, a power supply apparatus, and a wireless charging system of the embodiments of the present application are described below with reference to the drawings.

Fig. 1 is a block schematic diagram of a rectifier circuit according to an embodiment of the present application. The rectification circuit can realize half-wave rectification and is used for converting alternating current input into direct current output.

As shown in fig. 1, the rectifier circuit 10 includes: an ac input Vi, a dc output Vo, a MOS (metal oxide semiconductor) transistor V1, a controllable switching unit 11, and a comparison unit 12.

The ac input terminal Vi receives an input ac power. Specifically, the ac input Vi may be connected to a power supply device that supplies ac power, that is, ac power may be supplied from the power supply device, and the power supply device may be an ac power supply or an adapter, or the like. It will be appreciated that the ac input Vi may be connected directly to the power supply apparatus or indirectly, for example, when indirectly connected, the ac input Vi may be through circuitry for filtering the incoming ac power.

The direct current output Vo outputs direct current. That is, the rectified dc power can be output through the dc output Vo, and the half-wave rectified dc power is a pulsating dc power. Specifically, the dc output Vo may be connected to a post-stage circuit of the rectifying circuit to provide the converted dc power to the post-stage circuit, for example, the post-stage circuit may be a filtering circuit, and the dc power output from the dc output Vo may be filtered by the filtering circuit; for another example, the post-stage circuit may be a voltage transformation circuit, and the voltage transformation circuit may perform voltage transformation on the dc power output by the dc output Vo; for another example, the post-stage circuit may be a wireless transmitting circuit, and the wireless transmitting circuit may convert the dc power output by the dc output Vo into an ac power that can be coupled to the transmitting coil.

A first pole (for example, a drain) of the MOS transistor V1 is connected with the alternating current input end, and a second pole (for example, a source) of the MOS transistor V1 is connected with the direct current output end; the controllable switch unit 11 is connected with a control electrode (for example, a grid electrode) of the MOS transistor; the comparing unit 12 is connected to the ac input terminal Vi, the dc output terminal Vo, and the controllable switching unit 11, and the comparing unit 12 is configured to compare the ac input terminal Vi with the dc output terminal Vo, and control the MOS transistor V1 to turn on or off through the controllable switching unit 11 according to a comparison result, so as to perform half-wave rectification on the ac.

Specifically, the comparing unit 12 can determine the half cycle of the alternating current by comparing the alternating current input from the alternating current input Vi with the direct current output from the direct current output Vo, and control the MOS transistor to be turned on by the controllable switching unit when the alternating current is in the first half cycle, and to be turned off by the controllable switching unit when the alternating current is in the second half cycle.

It will be appreciated that the first half cycle may be a positive half cycle, i.e. a half cycle in which the voltage waveform rises from 0 to a peak and then steps down again to 0, and the second half cycle may be a negative half cycle, i.e. a half cycle in which the voltage waveform falls from 0 to a trough and then steps up again to 0. When alternating current is in the positive half cycle, MOS pipe V1 switches on, and alternating current transmits to direct current output Vo, and when alternating current is in the negative half cycle, MOS pipe V1 cuts off, and alternating current can't transmit to direct current output Vo to realize half-wave rectification.

Therefore, the embodiment of the application realizes half-wave rectification through the MOS tube V1, can reduce loss, reduce heat generation and improve efficiency, and particularly reduces loss and heat generation under a large-current load. In addition, the rectifier circuit does not need a special control chip of a synchronous rectification scheme, has simple circuit, low cost and small occupied space, and is suitable for portable products.

According to an embodiment of the present application, the MOS transistor V1 may be a P-channel MOS transistor. More specifically, it may be an enhancement P-channel MOS transistor. It can be understood that, through the P-channel MOS transistor, low voltage driving can be realized, so that a driving circuit for providing high voltage is not required, the circuit structure is further simplified, the cost is reduced, and the occupied space is reduced.

It should be noted that, the MOS transistor V1 with different models can be selected according to the size of the load connected to the subsequent stage of the rectifier circuit.

And, the dc output Vo may be a positive dc output Vo. That is, the rectifier circuit of the embodiment of the present application may be provided in the positive line of the dc output.

The circuit structure of the rectifier circuit is described in detail below with reference to fig. 2.

According to the embodiment of fig. 2, the comparison unit 12 comprises: comparator U1, the positive input end of comparator U1 links to each other with alternating current input Vi, the negative input end of comparator U1 links to each other with direct current output Vo, the output of comparator U1 links to each other with controllable switch unit 11, comparator U1 is when the voltage of alternating current input Vi is greater than the voltage of direct current output Vo, through controllable switch unit 11 control MOS pipe V1 switch on, and when the voltage of alternating current input Vi is less than the voltage of direct current output Vo, through controllable switch unit 11 control MOS pipe V1 turn-off.

It should be understood that when the ac power is in the positive half cycle, the voltage of the ac input terminal Vi is greater than the voltage of the dc output terminal Vo, the potential of the positive input terminal of the comparator U1 is higher than the potential of the negative input terminal, and the comparator U1 outputs a high level, at which time the controllable switch unit 11 is turned on, the MOS transistor V1 is turned on, and the positive half cycle of the ac power is output through the dc output terminal Vo. Similarly, when the alternating current is in the negative half cycle, the voltage of the alternating current input end Vi is smaller than the voltage of the direct current output end Vo, the potential of the negative input end of the comparator U1 is higher than the potential of the positive input end, the comparator U1 outputs a low level, the controllable switch unit 11 is turned off at the moment, the MOS transistor V1 is turned off, and the direct current output end Vo cannot output the negative half cycle of the alternating current. Thereby, a half-wave rectification function is realized.

Further, as shown in fig. 2, the controllable switching unit 11 includes; and a transistor Q1, wherein the base of the transistor Q1 is connected with the output end of the comparison unit 12, namely the comparator U1, the collector of the transistor Q1 is connected with the control electrode of the MOS transistor Q1, and the emitter of the transistor Q1 is grounded.

As shown in fig. 2, the rectifier circuit further includes: and one end of a second resistor R2, one end of the second resistor R2 is connected with the control electrode of the MOS transistor V1, and the other end of the second resistor R2 is connected with the second electrode of the MOS transistor V1.

Specifically, the operating principle of the rectifier circuit of the embodiment of the present application is as follows:

when the voltage of the alternating current input end Vi is larger than the voltage of the direct current output end Vo, the potential of the positive input end of the comparator U1 is higher than the potential of the negative input end, the comparator U1 outputs high level, the triode Q1 is conducted, and the MOS tube V1 is conducted. When the voltage of the alternating current input end Vi is smaller than the voltage of the direct current output end Vo, the potential of the negative input end of the comparator U1 is higher than that of the positive input end, the comparator U1 outputs low level, the triode Q1 is cut off, and the MOS tube V1 is turned off, so that the half-wave rectification function is realized.

Further, as shown in fig. 2, the comparing unit 12 further includes: one end of a first resistor R1 and one end of a first resistor R1 are connected with the positive input end of the comparator U1, and the other end of the first resistor R1 is connected with the output end of the comparator U1. It can be understood that the hysteresis threshold can be adjusted by the first resistor R1, so as to prevent interference and malfunction, and prevent repeated switching.

According to one embodiment of the present application, the dc output Vo is connected to a first capacitor C1, as shown in fig. 2. Specifically, one end of the first capacitor C1 is connected to the dc output Vo, and the other end of the first capacitor C1 is grounded. Therefore, the direct current output by the direct current output end Vo can be stabilized through the first capacitor C1, rectification is performed through the MOS tube, and the rectification is not needed to be performed through a large capacitor for stabilizing the voltage like diode rectification, the first capacitor C1 with a small capacitance value can be used for stabilizing the voltage in the embodiment of the application, so that the capacitor size is reduced, and the capacitor is suitable for being applied to portable products.

Therefore, half-wave rectification is realized through the P communication MOS tube, and as the on-resistance Rdson of the P communication MOS tube is low and can reach the level of m omega, the loss is extremely low and the heating is very small under the heavy current load. And a special control chip of a synchronous rectification scheme is not needed, the circuit is simple, the cost is low, and the half-wave rectification with low cost, large current and high efficiency is realized.

The rectifying resistor according to the embodiment of the present invention can be applied to any circuit or device that requires direct current, such as a switching power supply or a wireless charging circuit, and the present application is not limited thereto.

Based on the above embodiments, the present application provides a wireless charging device.

Fig. 3 is a block diagram of a wireless charging device according to an embodiment of the present application. As shown in fig. 3, the wireless charging device 200 includes a rectifying and filtering circuit 204 and a wireless transmission circuit 201.

The rectifying and filtering circuit 204 includes the rectifying circuit 10 of the foregoing embodiment, and the alternating current provided by the power supply apparatus 100 can be converted into direct current through the rectifying circuit 10; the wireless transmitting circuit 201 is connected with the rectifying and filtering circuit 204, the wireless transmitting circuit 201 comprises an electromagnetic coil, and the wireless transmitting circuit 201 is used for converting direct current into alternating current which can be coupled to the transmitting coil and converting the alternating current which can be coupled to the transmitting coil into an electromagnetic signal through the transmitting coil for transmitting.

That is, the wireless charging device 200 converts the alternating current supplied from the power supply apparatus 100 into the direct current by the rectifier circuit 10 and converts the direct current into the electromagnetic signal to perform power transmission in a wireless manner.

Further, according to an embodiment of the present invention, as shown in fig. 7, the wireless charging apparatus further includes: the first control circuit 202, the first control circuit 202 is connected with the wireless transmitting circuit 201, and the first control circuit 202 controls the wireless transmitting circuit 201 to control the wireless charging process. In addition, the first control circuit 202 may also communicate with the device to be charged.

Specifically, the first control circuit 202 receives the charging parameter fed back by the device to be charged by communicating with the device to be charged, and adjusts the transmitting power of the wireless transmitting circuit 202 according to the charging parameter fed back by the device to be charged. The charging parameter fed back by the device to be charged includes a charging voltage and/or a charging current, and more specifically, may be the charging voltage and/or the charging current of the first charging channel mentioned in the following embodiments.

Specifically, the first control circuit 202 receives power transmission efficiency information fed back by the device to be charged by communicating with the device to be charged, and the first control circuit 202 further determines an adjustment amplitude of the transmission power of the wireless transmission circuit 201 according to the power transmission efficiency information.

Specifically, the first control circuit 202 communicates with the device to be charged to receive battery temperature information fed back by the device to be charged, and when it is determined according to the battery temperature information that the temperature of the battery exceeds a preset temperature threshold, that is, the temperature of the battery is too high, the first control circuit 202 reduces the transmission power of the wireless transmission circuit 201.

Further, according to an embodiment of the present invention, as shown in fig. 7, the wireless charging apparatus further includes: a voltage conversion circuit 203, the voltage conversion circuit 203 is used for performing voltage conversion on the direct current supplied to the wireless transmission circuit 201 when the voltage of the direct current supplied to the wireless transmission circuit 201 does not meet the preset condition.

In summary, according to the wireless charging device provided by the embodiment of the present application, the rectifier circuit according to the first aspect of the present application can reduce loss and heat generation, especially under a large current load, and can also reduce cost.

The application also provides a power supply device.

Fig. 4 is a block schematic diagram of a power supply apparatus according to an embodiment of the present application. As shown in fig. 4, the power supply apparatus 100 includes a charging interface 101 and the rectifier circuit 10 of the foregoing embodiment, wherein the rectifier circuit 10 is used for converting alternating current provided by an alternating current power source, such as a mains grid, into direct current to be provided to the wireless charging device 200.

Corresponding to the wireless charging device in the embodiment of fig. 3, the embodiment of the present application provides a wireless charging system.

Fig. 5 is a block schematic diagram of a wireless charging system according to one embodiment of the present application. As shown in fig. 5, the wireless charging system includes: a power supply device 100, a wireless charging apparatus 200, and a device to be charged 300.

Wherein, the power supply apparatus 100 is used for supplying alternating current; the wireless charging device 200 is used for converting the alternating current provided by the power supply equipment into an electromagnetic signal to perform power transmission in a wireless manner, and the wireless charging device 200 may adopt the wireless charging device in the embodiment of fig. 3; the device to be charged 300 converts an electromagnetic signal transmitted from the wireless charging apparatus 200 into alternating current and converts the alternating current into direct current to charge the battery.

Corresponding to the power supply device in the embodiment of fig. 4, an embodiment of the present application provides a wireless charging system.

Fig. 6 is a block schematic diagram of a wireless charging system according to one embodiment of the present application. As shown in fig. 6, the wireless charging system includes: a power supply device 100, a wireless charging apparatus 200, and a device to be charged 300.

The power supply device 100 is used for converting alternating current into direct current, and the power supply device 100 can adopt the power supply device of the embodiment of fig. 4; the wireless charging device 200 is configured to convert the direct current provided by the power supply apparatus 100 into an electromagnetic signal to perform power transmission in a wireless manner; the device to be charged 300 converts an electromagnetic signal transmitted from the wireless charging apparatus 200 into alternating current and converts the alternating current into direct current to charge the battery.

The wireless charging system according to the foregoing embodiment of the present application will be described in detail with reference to fig. 7 to 9.

According to an embodiment of the present application, the power supply apparatus 100 is configured to supply a direct current to the wireless charging device 200. The power supply apparatus 100 may include: the rectifier circuit, the transformer circuit, the control circuit, the charging interface and the like can convert alternating current input into direct current output so as to provide the direct current output for the wireless charging device 200. For example, the power supply device may be an adapter, a power pack, a vehicle power supply, or the like.

According to another embodiment of the present application, the power supply apparatus 100 may also directly supply the alternating current to the wireless charging device 200. For example, the power supply apparatus 100 may be an ac power supply. When the power supply apparatus 100 is an ac power supply, the wireless charging device 200 further includes a circuit or a module for converting ac power into DC power, such as a rectifying filter circuit and a DC/DC conversion circuit.

The wireless charging device 200 is configured to convert the direct current or alternating current provided by the power supply apparatus 100 into an electromagnetic signal, so as to perform power transmission in a wireless manner.

Referring to fig. 7, in some embodiments, the wireless charging device 200 includes: a rectifying and filtering circuit (not shown), a DC/DC conversion circuit (not shown), a wireless transmission circuit 201, and a first control circuit 202.

The 220V alternating current is converted into stable direct current through a rectifying and filtering circuit, and then the voltage is regulated to a fixed value through the conversion of a DC/DC conversion circuit to be supplied to the wireless transmitting circuit 201.

It should be understood that the rectifying and filtering circuit and the DC/DC converting circuit are optional, and as described above, when the power supply apparatus 100 is an alternating current power supply, the wireless charging device 200 may be provided with the rectifying and filtering circuit and the DC/DC converting circuit. When the power supply apparatus 100 can supply a stable direct current, the rectifying filter circuit and/or the DC/DC conversion circuit can be eliminated.

A wireless transmitting circuit 201, for converting the direct current provided by the DC/DC converting circuit or the direct current provided by the power supply equipment into an alternating current which can be coupled to the transmitting coil, and converting the alternating current into an electromagnetic signal by the transmitting coil for transmission.

In some embodiments, the wireless transmit circuitry 201 may include: an inverter circuit and a resonant circuit. The inverter circuit may include a plurality of switching tubes, and the magnitude of the output power may be adjusted by controlling the on-time (duty ratio) of the switching tubes. A resonant circuit for transferring electrical energy away, for example, may include a capacitor and a transmitting coil. By adjusting the resonant frequency of the resonant circuit, the output power of the wireless transmission circuit 201 can be adjusted.

In some embodiments, the wireless charging apparatus 200 may be a wireless charging base or a device with an energy storage function, etc. When the wireless charging apparatus 200 is a device having an energy storage function, it further includes an energy storage module (e.g., a lithium battery) that can obtain and store electric energy from an external power supply device. Thus, the energy storage module may provide power to the wireless transmit circuit 201. It should be understood that the wireless charging apparatus 200 may obtain power from an external power supply device by wire or wirelessly. The wired connection, for example, connects with an external power supply device through a charging interface (e.g., Type-C interface) to obtain power. For example, the wireless charging apparatus 200 includes a wireless receiving circuit, which can wirelessly receive power from a device having a wireless charging function.

The first control circuit 202 is configured to control a wireless charging process. For example, the first control circuitry 202 may communicate with the power supply device to determine an output voltage and/or an output current of the power supply device. Alternatively, the first control circuit 202 may also communicate with the device to be charged, enable interaction of charging information (e.g., battery voltage information, battery temperature information, charging mode information, etc.) of the device to be charged, determination of charging parameters (e.g., charging voltage and/or charging current) for wireless charging, and so forth.

It should be understood that the wireless charging device 200 may also include other related hardware, logic devices, circuitry, and/or code to achieve the corresponding functionality. For example, the wireless charging device 200 may further include a display module (e.g., a light emitting diode or an LED display screen) for displaying the charging status in real time (e.g., charging is in progress or terminated, etc.) during the wireless charging process.

Referring to fig. 7, in the embodiment of the present application, the wireless charging device 200 further includes: a voltage conversion circuit 203. The voltage conversion circuit 203 is configured to perform voltage conversion on the current supplied to the wireless transmission circuit 201 when the voltage of the current supplied to the wireless transmission circuit 201 does not satisfy a preset condition. As previously mentioned, in one embodiment, the current provided to the wireless transmit circuitry 201 may be provided by DC/DC conversion circuitry, by a power supply device, by the aforementioned energy storage module, or the like.

Of course, alternatively, if the voltage supplied to the wireless transmission circuit 201 can reach the voltage requirement of the wireless transmission circuit 201 for the input voltage, the voltage conversion circuit 203 may be omitted to simplify the implementation of the wireless charging apparatus. The voltage requirement of the wireless transmitting circuit 201 for the input voltage can be set according to the actual requirement, for example, to 10V.

It should be noted that the voltage of the current supplied to the wireless transmission circuit 201 that does not satisfy the preset condition means that the voltage is lower than the required voltage of the wireless transmission circuit 201 or the voltage is higher than the required voltage of the wireless transmission circuit 201. For example, if a charging mode with high voltage and low current (e.g., 20V/1A) is used for wireless charging, the input voltage of the wireless transmitting circuit 201 is required to be higher (e.g., the voltage requirement is 10V or 20V). If the voltage supplied to the wireless transmission circuit 201 cannot meet the voltage requirement of the wireless transmission circuit 201, the voltage conversion circuit 203 may boost the input voltage to meet the voltage requirement of the wireless transmission circuit 201. If the output voltage of the power supply device exceeds the voltage requirement of the wireless transmission circuit 201, the voltage conversion circuit 203 may step down the input voltage to meet the voltage requirement of the wireless transmission circuit 201.

Referring to fig. 8, according to an embodiment of the present application, a device to be charged 300 includes: a wireless receiving circuit 301, a second control circuit 302, a voltage reduction circuit 303, a detection circuit 304, a battery 305, and a first charging channel 306.

In some embodiments, the wireless receiving circuit 301 is configured to convert the electromagnetic signal transmitted by the wireless transmitting circuit 201 of the wireless charging apparatus 200 into an alternating current through the receiving coil, and perform rectification and/or filtering operations on the alternating current to convert the alternating current into a stable direct current to charge the battery 305.

In some embodiments, the wireless receiving circuit 301 includes: a receiving coil, and an AC/DC conversion circuit 307. And an AC/DC conversion circuit 307 for converting the alternating current received by the receiving coil into direct current.

According to one embodiment of the present application, battery 305 may include a single cell or multiple cells. When the battery 305 includes multiple cells, the multiple cells are connected in series. Therefore, the charging voltage which can be borne by the battery 305 is the sum of the charging voltages which can be borne by a plurality of battery cells, the charging speed can be increased, and the charging heat emission can be reduced.

Taking the device to be charged as a mobile phone as an example, when the battery 305 of the device to be charged includes a single cell, the voltage of the internal single cell is generally between 3.0V and 4.35V. When the battery 305 of the device to be charged includes two cells connected in series, the total voltage of the two cells connected in series is 6.0V to 8.7V. Therefore, compared with a single battery cell, when a plurality of battery cells are connected in series, the output voltage of the wireless receiving circuit 301 can be increased. Compared with a single battery cell, the charging speed is equal, and the charging current required by the multiple battery cells is about 1/N (N is the number of the battery cells which are connected in series in the equipment to be charged) of the charging current required by the single battery cell. In other words, on the premise of ensuring the same charging speed (the same charging power), the scheme of multiple battery cells is adopted, so that the magnitude of the charging current can be reduced, and the heat productivity of the equipment to be charged in the charging process is reduced. On the other hand, compared with the single-cell scheme, the charging voltage can be increased by adopting the multi-cell series scheme under the condition that the charging current is kept the same, so that the charging speed is increased.

According to one embodiment of the present application, the first charging channel 306 may be a conductive wire. A voltage step-down circuit 303 may be disposed on the first charging path 306.

The voltage reducing circuit 303 is configured to reduce the dc power output by the wireless receiving circuit 301 to obtain an output voltage and an output current of the first charging channel 306. In one embodiment, the voltage and current values of the dc power output by the first charging channel 306, which meet the charging requirements of the battery 305, can be directly applied to the battery 305.

The detection circuit 304 is used for detecting a voltage value and/or a current value of the first charging channel 306. The voltage value and/or the current value of the first charging channel 306 may refer to a voltage value and/or a current value between the wireless receiving circuit 301 and the voltage dropping circuit 303, that is, an output voltage value and/or a current value of the wireless receiving circuit 301. Alternatively, the voltage value and/or the current value on the first charging channel 306 may also refer to the voltage value and/or the current value between the voltage-reducing circuit 303 and the battery 305, i.e. the output voltage and/or the output current of the voltage-reducing circuit 303.

In some embodiments, the detection circuit 304 may include: a voltage detection circuit 304 and a current detection circuit 304. The voltage detection circuit 304 may be configured to sample a voltage on the first charging channel 306 and send the sampled voltage value to the second control circuit 302. In some embodiments, the voltage detection circuit 304 may sample the voltage on the first charging channel 306 by serial voltage division. The current detection circuit 304 may be configured to sample the current on the first charging channel 306 and send the sampled current value to the second control circuit 302. In some embodiments, the current detection circuit 304 may sample the current on the first charging channel 306 through a current sensing resistor and a current sensing meter.

In some embodiments, the second control circuit 302 is configured to communicate with the first control circuit 202 of the wireless charging apparatus and feed back the voltage value and/or the current value detected by the detection circuit 304 to the first control circuit 202. Thus, the first control circuit 202 may adjust the transmission power of the wireless transmission circuit 201 according to the voltage value and/or the current value of the feedback, so that the voltage value and/or the current value of the direct current output by the first charging channel 306 matches with the charging voltage value and/or the current value required by the battery 305.

It should be understood that in one embodiment of the present application, "matching a desired charging voltage value and/or current value of the battery 305" includes: the voltage and/or current values of the dc power output by the first charging channel 306 are equal to or float within a predetermined range (e.g., 100 mv to 200 mv above and below) of the charging voltage and/or current values required by the battery 305.

In the embodiment of the present application, the voltage reduction circuit 303 may be implemented in various forms. As one example, the voltage-reducing circuit 303 may be a Buck circuit. As another example, the voltage-reducing circuit 303 may be a charge pump (charge pump). The charge pump is composed of a plurality of switching devices, and the heat generated when the current flows through the switching devices is very small and almost equal to the heat generated when the current directly passes through a conducting wire, so that the charge pump is used as the voltage reduction circuit 303, not only can the voltage reduction effect be achieved, but also the heating is low. The voltage step-down circuit 303 may also be a half-voltage circuit, as one example.

In some embodiments, the setting of the voltage-boosting multiple of the voltage converting circuit 203 of the wireless charging apparatus 200 and the voltage-reducing multiple of the voltage-reducing circuit 303 of the device to be charged 300 is related to parameters such as an output voltage that can be provided by the power supply device and a charging voltage required by the battery 305, and the two may be equal or unequal, which is not specifically limited in this embodiment of the application.

As an example, the voltage boosting multiple of the voltage conversion circuit 203 and the voltage reducing multiple of the voltage reducing circuit 303 may be set to be equal. For example, the voltage conversion circuit 203 may be a voltage doubler circuit for boosting the output voltage of the power supply device by 2 times; the voltage-decreasing circuit 303 may be a half-voltage circuit for decreasing the output voltage of the wireless receiving circuit 301 by half.

According to an embodiment of the present application, the voltage-boosting multiple of the voltage converting circuit 203 and the voltage-reducing multiple of the voltage-reducing circuit 303 are set to be 1:1, which makes the output voltage and the output current of the voltage-reducing circuit 303 consistent with the output voltage and the output current of the power supply device, respectively, and is beneficial to simplifying the implementation of the control circuit. Taking the requirement of the battery 305 for the charging current as 5A as an example, when the second control circuit 302 knows that the output current of the voltage reduction circuit 303 is 4.5A through the detection circuit 304, the output power of the power supply device needs to be adjusted so that the output current of the voltage reduction circuit 303 reaches 5A. If the ratio of the voltage-boosting multiple of the voltage conversion circuit 203 to the voltage-reducing multiple of the voltage-reducing circuit 303 is not equal to 1:1, when the output power of the power supply apparatus is adjusted, the first control circuit 202 or the second control circuit 302 needs to recalculate the adjustment value of the output power of the power supply apparatus based on the difference between the current output current of the voltage-reducing circuit 303 and the desired value. In an embodiment of the present application, the ratio of the voltage-boosting multiple of the voltage conversion circuit 203 to the voltage-reducing multiple of the voltage-reducing circuit 303 is set to 1:1, and then the second control circuit 302 notifies the first control circuit 202 to boost the output current to 5A, thereby simplifying the feedback adjustment manner of the wireless charging path.

Referring to fig. 9, in an embodiment of the present application, the device to be charged 300 further includes: a second charging channel 308. The second charging channel 308 may be a conductive wire. A conversion circuit 307 may be disposed on the second charging channel 308 for performing voltage control on the dc power output by the wireless receiving circuit 301, so as to obtain an output voltage and an output current of the second charging channel 308, so as to charge the battery 305.

In one embodiment, the transformation circuit 307 comprises: a circuit for stabilizing voltage and a circuit for realizing constant current and constant voltage. The circuit for voltage stabilization is connected to the wireless receiving circuit 301, and the circuit for constant current and constant voltage is connected to the battery 305.

When the second charging channel 308 is used to charge the battery 305, the wireless transmitting circuit 201 may use a constant transmitting power, and after the wireless receiving circuit 301 receives the electromagnetic signal, the electromagnetic signal is processed by the converting circuit 307 into a voltage and a current meeting the charging requirement of the battery 305, and then the voltage and the current are input to the battery 305 to charge the battery 305. It should be understood that in some embodiments, a constant transmit power need not be a transmit power that remains completely constant, and may vary within a range, for example, a transmit power of 7.5W floating up or down by 0.5W.

In some embodiments, when the battery 305 is charged through the second charging channel 308, the wireless charging device and the device to be charged may be wirelessly charged according to the Qi standard.

According to an embodiment of the present application, the voltage conversion circuit 203 is disposed on the wireless charging device side. A first charging channel 306 (e.g., a wire) is provided on the device to be charged that is connected to the battery 305. The first charging channel 306 is provided with a voltage reduction circuit 303 for reducing the output voltage of the wireless receiving circuit 301, so that the output voltage and the output current of the first charging channel 306 meet the charging requirement of the battery 305.

In one embodiment, if the wireless charging apparatus 200 charges the single-cell battery 305 in the device to be charged with 20W of output power, when the single-cell battery 305 is charged with the second charging channel 308, the input voltage of the wireless transmitting circuit 201 needs to be 5V, the input current needs to be 4A, and the use of a current of 4A inevitably causes the coil to generate heat, thereby reducing the charging efficiency.

When the single-cell battery 305 is charged by using the first charging channel 306, since the voltage-reducing circuit 303 is disposed on the first charging channel 306, the input voltage of the wireless transmitting circuit 201 can be increased without changing the transmitting power of the wireless transmitting circuit 201 (20W as described above), and thus, the input current of the wireless transmitting circuit 201 can be reduced.

In an embodiment of the present application, the voltage dropping circuit 303 may adopt a half-voltage circuit, that is, the ratio of the input voltage and the output voltage of the voltage dropping circuit 303 is a fixed 2: 1 to further reduce the heat generation of the step-down circuit 303.

In some embodiments, the wireless charging device 200 may be provided in various shapes, e.g., circular, square, etc.,

in some embodiments, many other communications may also be exchanged between the first control circuitry 202 and the second control circuitry 302. In some embodiments, information for safety protection, abnormality detection, or fault handling, such as temperature information of the battery 305, information indicating overvoltage protection or overcurrent protection, and power transfer efficiency information (which may be used to indicate power transfer efficiency between the wireless transmitting circuit 201 and the wireless receiving circuit 301) may be exchanged between the first control circuit 202 and the second control circuit 302.

For example, when the temperature of the battery 305 is too high, the first control circuit 202 and/or the second control circuit 302 may control the charging loop to enter a protection state, such as controlling the charging loop to stop wireless charging. For another example, after the first control circuit 202 receives the indication information of the overvoltage protection or the overcurrent protection sent by the second control circuit 302, the first control circuit 202 may reduce the transmission power or control the wireless transmission circuit 201 to stop operating. As another example, after the first control circuit 202 receives the power transmission efficiency information sent by the second control circuit 302, if the power transmission efficiency is lower than the preset threshold, the wireless transmission circuit 201 may be controlled to stop working, and the user may be notified of the event, for example, the power transmission efficiency is too low through the display screen, or the power transmission efficiency is too low through the indicator light, so that the user can adjust the environment of the wireless charging.

In some embodiments, other information that can be used to adjust the transmit power adjustment of the wireless transmit circuitry 201, such as temperature information of the battery 305, information indicative of a peak or average value of the voltage and/or current on the first charging channel 306, power transfer efficiency information (which may be used to indicate the power transfer efficiency between the wireless transmit circuitry 201 and the wireless receive circuitry 301), and the like, may be interacted between the first control circuitry 202 and the second control circuitry 302.

For example, the second control circuit 302 may send power transfer efficiency information to the first control circuit 202, and the first control circuit 202 is further configured to determine an adjustment magnitude of the transmission power of the wireless transmission circuit 201 according to the power transfer efficiency information. Specifically, if the power transfer efficiency information indicates that the power transfer efficiency between the wireless transmission circuit 201 and the wireless reception circuit 301 is low, the first control circuit 202 may increase the adjustment amplitude of the transmission power of the wireless transmission circuit 201 so that the transmission power of the wireless transmission circuit 201 quickly reaches the target power.

As another example, if the wireless receiving circuit 301 outputs a voltage and/or a current with a pulsating waveform, the second control circuit 302 may send information indicating a peak value or a mean value of the output voltage and/or the output current of the first charging channel 306 to the first control circuit 202, the first control circuit 202 may determine whether the peak value or the mean value of the output voltage and/or the output current of the first charging channel 306 matches a charging voltage and/or a charging current currently required by the battery 305, and if not, the transmitting power of the wireless transmitting circuit 201 may be adjusted.

As another example, the second control circuit 302 may send the temperature information of the battery 305 to the first control circuit 202, and if the temperature of the battery 305 is too high, the first control circuit 202 may decrease the transmission power of the wireless transmission circuit 201 to decrease the output current of the wireless reception circuit 301, thereby decreasing the temperature of the battery 305.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A rectifier circuit, comprising:

an AC input terminal receiving an input AC power;

a DC output terminal, which outputs DC;

the first pole of the MOS tube is connected with the alternating current input end, and the second pole of the MOS tube is connected with the direct current output end;

the controllable switch unit is connected with the control electrode of the MOS tube;

and the comparison unit is connected with the alternating current input end, the direct current output end and the controllable switch unit, and is used for comparing alternating current input by the alternating current input end with direct current output by the direct current output end and controlling the MOS tube to be switched on or switched off through the controllable switch unit according to a comparison result so as to perform half-wave rectification on the alternating current.

2. The rectifier circuit according to claim 1, wherein the comparison unit includes:

the positive input end of the comparator is connected with the alternating current input end, the negative input end of the comparator is connected with the direct current output end, the output end of the comparator is connected with the controllable switch unit, the comparator is used for controlling the MOS tube to be conducted through the controllable switch unit when the voltage of the alternating current input end is greater than the voltage of the direct current output end, and controlling the MOS tube to be turned off through the controllable switch unit when the voltage of the alternating current input end is less than the voltage of the direct current output end.

3. The rectifier circuit according to claim 2, wherein the comparison unit further comprises:

and one end of the first resistor is connected with the positive input end of the comparator, and the other end of the first resistor is connected with the output end of the comparator.

4. The rectifier circuit according to claim 1, wherein the MOS transistor is a P-channel MOS transistor.

5. A rectifier circuit according to claim 4, characterized in that the controllable switch unit comprises;

and the base electrode of the triode is connected with the comparison unit, the collector electrode of the triode is connected with the control electrode of the MOS, and the emitting electrode of the triode is grounded.

6. The rectifier circuit according to claim 1 or 5, further comprising:

and one end of the second resistor is connected with the control electrode of the MOS tube, and the other end of the second resistor is connected with the second electrode of the MOS tube.

7. A wireless charging device, comprising:

a rectifying and smoothing circuit including the rectifying circuit according to any one of claims 1 to 6, wherein the alternating current supplied from the power supply device is converted into direct current by the rectifying circuit;

the wireless transmitting circuit comprises an electromagnetic coil and is used for converting the direct current into alternating current which can be coupled to the transmitting coil and converting the alternating current which can be coupled to the transmitting coil into an electromagnetic signal through the transmitting coil for transmission.

8. The wireless charging apparatus of claim 7, further comprising:

a first control circuit that controls a wireless charging process.

9. The wireless charging apparatus according to claim 8, wherein the first control circuit communicates with a device to be charged to receive the charging parameter fed back by the device to be charged, and the first control circuit further adjusts the transmission power of the wireless transmission circuit according to the charging parameter fed back by the device to be charged.

10. The wireless charging apparatus according to claim 8, wherein the first control circuit communicates with a device to be charged to receive power transmission efficiency information fed back by the device to be charged, and the first control circuit further determines an adjustment amplitude of the transmission power of the wireless transmission circuit according to the power transmission efficiency information.

11. The wireless charging apparatus according to claim 8, wherein the first control circuit communicates with a device to be charged to receive battery temperature information fed back by the device to be charged, and the first control circuit reduces the transmission power of the wireless transmission circuit when determining that the temperature of the battery exceeds a preset temperature threshold according to the battery temperature information.

12. The wireless charging apparatus of claim 7, further comprising:

and the voltage conversion circuit is used for performing voltage conversion on the direct current provided for the wireless transmitting circuit when the voltage of the direct current provided for the wireless transmitting circuit does not meet a preset condition.

13. A power supply apparatus, comprising:

the charging interface is connected with the wireless charging device;

the rectifier circuit of any one of claims 1-6, which converts alternating current provided by an alternating current power source to direct current for provision to the wireless charging device.

14. A wireless charging system, comprising:

a power supply device for supplying alternating current;

the wireless charging apparatus according to any one of claims 7 to 12, the wireless charging apparatus being configured to convert the alternating current provided by the power supply device into an electromagnetic signal for power transmission in a wireless manner;

and the equipment to be charged converts the electromagnetic signal transmitted by the wireless charging device into alternating current and converts the alternating current into direct current so as to charge a battery.

15. A wireless charging system, comprising:

the power supply apparatus according to claim 13, the power supply apparatus being configured to convert alternating current to direct current;

the wireless charging device is used for converting the direct current provided by the power supply equipment into an electromagnetic signal so as to transmit power in a wireless mode;