WO2023213261A1

WO2023213261A1 - Wireless charging voltage stabilizing circuit, power supply, and new energy vehicle

Info

Publication number: WO2023213261A1
Application number: PCT/CN2023/091966
Authority: WO
Inventors: 王超
Original assignee: 长春捷翼汽车科技股份有限公司
Priority date: 2022-05-06
Filing date: 2023-05-04
Publication date: 2023-11-09
Also published as: CN217692808U

Abstract

A wireless charging voltage stabilizing circuit, a power supply, and a new energy vehicle. The circuit comprises: a chip (1), used for comparing a battery voltage with a reference voltage and outputting a control signal, so as to control an MOS module (2) to switch between boost and buck topology modes. The chip (1) controls the duty ratio of a switching tube of the MOS module (2) on the basis of a periodic signal from a control unit (3). The problem of an unstable output voltage caused by change of a power supply voltage of a wireless charger along with the change of a battery is solved. In addition, by controlling the duty ratio of the switching tube of the MOS module (2) and adjusting the output voltage, the wireless charger can charge a mobile phone at any power within an allowable range.

Description

A wireless charging voltage stabilizing circuit, power supply and new energy vehicle

The embodiments of this specification claim the priority of the Chinese patent application with application number 202221070754.0 and the invention name "A wireless charging voltage stabilizing circuit, power supply and new energy vehicle" submitted on May 6, 2022, the entire content of which is incorporated by reference. In the examples of this specification.

Technical field

The utility model relates to the field of electric power, and in particular to a wireless charging voltage stabilizing circuit, a power supply and a new energy vehicle.

Background technique

In new energy vehicles, because there are many electronic devices in the vehicle and various electronic devices have high power requirements, the research on power supply in new energy vehicles is the most important thing for each car manufacturer.

Usually, the power supply of new energy vehicles is provided by a battery pack composed of batteries of different capacities. Since the battery output voltage is different when the remaining power is different, for electronic devices with higher voltage requirements, the battery voltage Changes will cause the working status of electronic devices to be unstable. Therefore, it is necessary to design a circuit that can stabilize the output voltage of the battery.

Utility model content

In view of the above-mentioned problems of the prior art, the purpose of the embodiments of this specification is to provide a wireless charging voltage stabilizing circuit, a power supply and a new energy vehicle to solve the problem of unstable battery voltage output in the prior art.

In order to solve the above technical problems, the specific technical solutions of the embodiments of this specification are as follows:

On the one hand, embodiments of this specification provide a wireless charging voltage stabilizing circuit, including:

Chip, used to compare the battery voltage with the reference voltage and output a control signal to control the MOS module to switch the boost/buck topology mode;

The chip controls the duty cycle of the switch tube of the MOS module based on the periodic signal from the control unit.

As an example of the embodiment of this specification, the chip is configured as:

When the battery voltage is higher than the reference voltage, the chip controls the MOS module to switch to the buck topology mode;

When the battery voltage is lower than the reference voltage, the chip controls the MOS module to switch to the boost topology mode.

As an example of the embodiment of this specification, the MOS module includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first inductor;

The gates of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all connected to the chip and receive the control signal;

The drain of the first switch tube is connected to the battery voltage;

The source of the first switch is connected to the drain of the second switch;

The drain of the third switch tube is connected to the output port.

The source of the third switch is connected to the drain of the fourth switch;

The source of the second switch is connected to the source of the fourth switch and grounded;

The first inductor is provided between a connection point between the first switch tube and the second switch tube and a connection point between the third switch tube and the fourth switch tube.

As an example of the embodiment of this specification, when the MOS module switches to the buck topology mode, the chip controls the first switch tube and the second switch tube to conduct periodically and complementaryly, and controls the third switch tube to conduct periodically. The switch tube is turned on, and the fourth switch tube is controlled to be turned off.

As an example of the embodiment of this specification, when the MOS module switches to the boost topology mode, the chip controls the third switch tube and the fourth switch tube to be periodically complementary and conducts, and controls the first The switch tube is turned on and the second switch tube is controlled to be turned off.

As an example of the embodiment of this specification, a filter module is provided between the chip and the battery voltage;

The filter module is used to filter the battery voltage.

As an example of the embodiment of this specification, the filter module includes a first capacitor, a second capacitor and a third capacitor;

One end of the first capacitor is connected to the battery voltage, and the other end is connected to P ground;

One end of the second capacitor is connected to one end of the first capacitor, and the other end is connected to P ground;

One end of the third capacitor is connected to one end of the second capacitor, and the other end is connected to P ground.

As an example of the embodiment of this specification, an input current protection module is provided between the chip and the battery voltage;

The input current protection module is used to prevent the battery voltage received by the chip from exceeding a first threshold.

As an example of the embodiment of this specification, the input current protection module includes a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a fifteenth capacitor and a twelfth resistor;

One end of the fourth capacitor is connected to one end of the third capacitor, and the other end is connected to P ground;

One end of the first resistor is connected to one end of the fourth capacitor, and the other end is connected to the drain of the first switch tube;

One end of the second resistor is connected to one end of the fourth capacitor, and the other end is connected to the chip;

One end of the third resistor is connected to the other end of the first resistor, and the other end of the third resistor is connected to the chip;

The fifth capacitor is connected to the other end of the second resistor and the other end of the third resistor respectively;

One end of the fifteenth capacitor is connected to the chip, and the other end is connected to ground A;

One end of the twelfth resistor is connected to one end of the fifteenth capacitor, and the other end is connected to ground A.

As an example of the embodiment of this specification, a power supply module is provided between the MOS module and the chip;

The energy supply module is used to provide electric energy to the MOS module.

As an example of the embodiment of this specification, the power supply module includes a first diode, a second diode, a sixth capacitor, a seventh capacitor and VCC;

The anode of the first diode is connected to the VCC, and the cathode is connected to the chip;

One end of the sixth capacitor is connected to the cathode of the first diode, and the other end of the sixth capacitor is connected to the connection points of the chip and the first switch tube and the second switch tube respectively;

The anode of the second diode is connected to the VCC, and the cathode is connected to the chip;

One end of the seventh capacitor is connected to the cathode of the second diode, and the other end of the seventh capacitor is connected to the connection points of the chip and the third switch tube and the fourth switch tube respectively.

As an example of the embodiment of this specification, the chip is also connected to an enabling module;

The enabling module is used to start the chip.

As an example of the embodiment of this specification, the enabling module includes a fourth resistor, a fifth resistor and an eighth capacitor;

One end of the fourth resistor is connected to P ground and one end of the eighth capacitor respectively, and the other end of the fourth resistor is connected to the enable signal and one end of the fifth resistor respectively;

The other end of the fifth resistor is connected to the chip;

The other end of the eighth capacitor is connected to the other end of the third capacitor and the chip respectively.

As an example of the embodiment of this specification, the chip is also connected to an output current protection module;

The output current protection module is used to prevent the output current of the chip from exceeding a second preset threshold.

As an example of the embodiment of this specification, the output current protection module includes a ninth capacitor, a sixth resistor, a seventh resistor, an eleventh resistor and a fourteenth capacitor;

One end of the sixth resistor is connected to the chip, and the other end outputs a voltage;

One end of the seventh resistor is connected to the chip, and the other end is suspended;

The ninth capacitor is provided between one end of the sixth resistor and one end of the seventh resistor;

One end of the eleven resistors is connected to the chip, and the other end is connected to ground A;

One end of the fourteenth capacitor is connected to one end of the eleventh resistor, and the other end is connected to ground A.

As an example of the embodiment of this specification, the chip is also connected to a feedback module;

The feedback module is used to obtain the output voltage of the output port and send the output voltage to the chip to adjust the reference voltage.

As an example of the embodiment of this specification, the feedback module includes a tenth capacitor, an eleventh capacitor, an eighth resistor and a ninth resistor;

One end of the tenth capacitor is connected to the drain of the chip and the third switch respectively, and the other end of the tenth capacitor is connected to P ground;

One end of the eleventh capacitor is connected to one end of the tenth capacitor, and the other end is connected to P ground;

One end of the eighth resistor is connected to one end of the tenth capacitor, and the other end is connected to one end of the chip and the ninth resistor respectively;

The other end of the ninth resistor is connected to P ground.

As an example of the embodiment of this specification, the chip is also connected to a loop stabilization module;

The loop stabilization module is used to improve the power supply ripple suppression ratio of the chip.

As an example of the embodiment of this specification, the loop stabilization module includes a twelfth capacitor, a thirteenth capacitor and a tenth resistor;

One end of the twelfth capacitor is connected to the chip, and the other end is connected to ground A;

One end of the tenth resistor is connected to the chip, and the other end is connected to the thirteenth capacitor;

The other end of the thirteenth capacitor is connected to ground A.

As an example of the embodiment of this specification, there are disposed devices between the gates of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube and the chip. protection resistor.

On the other hand, embodiments of this specification provide a power supply provided with any one of the wireless charging voltage stabilizing circuits.

On the other hand, embodiments of this specification provide a new energy vehicle, which is provided with the power supply.

The above technical solution is used to solve the problem of the wireless charger's power supply voltage changing with the change of the battery, causing the output voltage to be unstable. By controlling the topology mode of the MOS module, any voltage can be set to supply the full-bridge inverter part. Through the control signal, the duty cycle of the switch tube of the MOS module is controlled, and the output voltage is adjusted, so that the wireless charger can charge the mobile phone with any power within the allowed range.

In order to make the above and other objects, features and advantages of the embodiments of this specification more obvious and understandable, preferred embodiments are cited in the following and described in detail with reference to the accompanying drawings.

Description of the drawings

In order to more clearly explain the embodiments of this specification or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some examples of the embodiments of this specification. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 shows a schematic diagram of a wireless charging voltage stabilizing circuit according to an embodiment of this specification;

Figure 2 shows the topology diagram of the wireless charging voltage stabilizing circuit according to the embodiment of this specification;

Figure 3 shows a circuit diagram of a wireless charging voltage stabilizing circuit according to an embodiment of this specification.

Explanation of drawing symbols:
1. Chip; 2. MOS module; 3. Control unit; 4. Filter module; 5. Input current protection module; 6.
Energy supply module; 7. Enable module; 8. Output current protection module; 9. Feedback module; 10. Loop stabilization module; 101. First capacitor; 102. Second capacitor; 103. Third capacitor; 104. Four capacitors; 105, the fifth capacitor; 106, the sixth capacitor; 107, the seventh capacitor; 108, the eighth capacitor; 109, the ninth capacitor; 110, the tenth capacitor; 111, the eleventh capacitor; 112, the tenth capacitor Two capacitors; 113, the thirteenth capacitor; 114, the fourteenth capacitor; 115, the fifteenth capacitor; 201, the first resistor; 202, the second resistor; 203, the third resistor; 204, the fourth resistor; 205, The fifth resistor; 206, the sixth resistor; 207, the seventh resistor; 208, the eighth resistor; 209, the ninth resistor; 210, the tenth resistor; 211, the eleventh resistor; 212, the twelfth resistor; 301, First inductor; 401, first switch tube; 402, second switch tube; 403, third switch tube; 404, fourth switch tube; 501, first diode; 502, second diode.

Detailed ways

The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of this specification, not all of the embodiments. . Based on the embodiments in this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the embodiments in this specification.

It should be noted that in the description and claims of the embodiments of this specification and the above-mentioned drawings, the term "th "First", "second", etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that data so used are interchangeable under appropriate circumstances for the purposes of the embodiments of the present specification described herein. The embodiments can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusions, e.g., the inclusion of a series of steps or units of a process, method, apparatus, product, or device need not be limited to those steps or units expressly listed, but may include other steps or units not expressly listed or inherent to such processes, methods, products, or devices .

As shown in Figure 1, the schematic diagram of the wireless charging voltage stabilizing circuit includes:

Chip 1 is used to compare the battery voltage with the reference voltage and output a control signal to control the MOS module 22 to switch the boost/buck topology mode;

Based on the periodic signal from the control unit 3, the chip 1 controls the duty cycle of the switching tube of the MOS module 2.

The above circuit is used to solve the problem of the wireless charger's power supply voltage changing with the change of the battery, causing the output voltage to be unstable. By controlling the topology mode of the MOS module 2, any voltage can be set to supply the full-bridge inverter part, and the MOS is controlled through the control signal. The conduction/cutoff frequency of the switch tube of module 2 adjusts the output voltage so that the wireless charger can charge the mobile phone with any power within the allowed range.

It should be noted that the reference voltage can be obtained by proportional calculation based on the internal circuit of chip 1, or it can be introduced by chip 1 from an external circuit. Because it is more common and easier for chip 1 to obtain the reference voltage from the outside, it can usually be It is obtained by cascading reference voltage chip 1 and chip 1. The disadvantage is that when adjusting reference voltage chip 1, reference voltage chip 1 needs to be replaced. Therefore, the embodiment of this specification uses proportional operation to obtain the reference voltage. The following content will be detailed. Describe the external circuit structure of chip 1 and the additional circuit structure of chip 1. Through the cooperation of the circuits, it can be ensured that when the voltage stabilizing circuit is working, it is in a state of excellent robustness, voltage stability and switching speed.

As shown in Figure 2, the topology diagram of the wireless charging voltage stabilizing circuit, as an example of the embodiment of this specification, the chip 1 is configured as:

When the battery voltage is higher than the reference voltage, chip 1 controls MOS module 2 to switch to buck topology mode;

When the battery voltage is lower than the reference voltage, chip 1 controls MOS module 2 to switch to boost topology mode.

It can be explained that when the battery capacity gradually decreases from 100%, its output voltage will also decrease accordingly. This is caused by the internal structure of the battery. For example, when the battery capacity is 100%, its output voltage is 16V. When the battery capacity is 30%, the voltage output of the battery may be only 9V. Currently, various types of mobile phone charging protocols set the charging voltage. For example, it may need to reach 12V before charging can be started. When the voltage When it is lower than 12V or higher than 12V, the mobile phone will not be charged, so a circuit topology is needed. When the battery capacity is low, When the output voltage is low, the output voltage is increased to meet the charging voltage requirements of the mobile phone. When the battery capacity is high and the output voltage is high, the output voltage is reduced to meet the charging voltage requirements of the mobile phone.

In the embodiment of this specification, the buck topology mode is a buck mode, that is, the output voltage is reduced.

Boost topology mode is a boost mode, that is, the output voltage increases.

As an example of the embodiment of this specification, the MOS module 2 includes a first switch tube 401, a second switch tube 402, a third switch tube 403, a fourth switch tube 404 and a first inductor 301;

The gates of the first switch tube 401, the second switch tube 402, the third switch tube 403 and the fourth switch tube 404 are all connected to the chip 1 and receive control signals;

The drain of the first switch tube 401 is connected to the battery voltage;

The source of the first switch 401 is connected to the drain of the second switch 402;

The drain of the third switch 403 is connected to the output port;

The source of the third switch 403 is connected to the drain of the fourth switch 404;

The source of the second switch 402 is connected to the source of the fourth switch 404 and grounded;

The first inductor 301 is provided between the connection point of the first switch tube 401 and the second switch tube 402 and the connection point of the third switch tube 403 and the fourth switch tube 404.

It should be noted that in the embodiment of this specification, the first switch tube 401 and the second switch tube 402 are in complementary conduction, and the third switch tube 403 and the fourth switch tube 404 are in complementary conduction. That is, when the first switch tube 401 is When it is turned on, the second switch tube 402 must be turned off. When the first switch tube 401 is turned off, the second switch tube 402 must be turned on. Similarly, the third switch tube 403 and the fourth switch tube 404 also follow the above rules. The description of the embodiments will not be repeated here.

The output port is used to stream the output voltage.

As an example of the embodiment of this specification, when the MOS module 2 switches to the buck topology mode, the chip 1 controls the first switch transistor 401 and the second switch transistor 402 to conduct periodic complementary conduction, and controls the third switch transistor 403 to conduct, The fourth switching tube 404 is controlled to be turned off.

In this topology, the output voltage needs to be reduced, so when the first switch 401 is turned on, the first capacitor 101 stores the battery voltage and generates a reactive electromotive force, so that the output voltage is less than the battery voltage. When When the second switch 402 is turned on, according to Lenz's law, the first inductor 301 generates electromotive force. However, because the inductor can never be larger than the battery voltage, the final output voltage is smaller than the battery voltage. Therefore, when the first switch 401 When complementary conduction is performed with the second switch transistor 402, no matter which one of the switch transistors is conductive, the output voltage will be smaller than the battery voltage.

As an example of the embodiment of this specification, when the MOS module 2 switches to the boost topology mode, the chip 1. Control the third switching transistor 403 and the fourth switching transistor 404 to conduct periodically and complementaryly, control the first switching transistor 401 to conduct, and control the second switching transistor 402 to turn off.

In this topology, the output voltage needs to be increased. When the third switch 403 is turned off, the first inductor 301 stores the battery voltage. When the fourth switch 404 is turned on, the first inductor 301 releases the battery voltage and adds battery voltage, achieving an increase in output voltage.

As an example of the embodiment of this specification, a filter module 4 is provided between the chip 1 and the battery voltage;

The filter module 4 is used to filter and rectify the battery voltage.

It should be noted that in order to make the voltage input to the voltage stabilizing circuit more stable and reduce the alternating current in the direct current, a filter circuit is needed for filtering. Usually, the capacitor can be grounded to introduce the alternating current into the ground. The characteristics of the capacitor It will isolate DC so that DC and AC can be better distinguished. The specific circuit of the filter module 4 is described in detail in the following content.

As an example of the embodiment of this specification, an input current protection module 5 is provided between the chip 1 and the battery voltage;

The input current protection module 5 is used to prevent the battery voltage received by the chip 1 from exceeding the first threshold.

It should be noted that in the power supply, it is inevitable that the power supply voltage will be very large in an instant due to static electricity or air discharge, or even several times higher than the normal value. Therefore, in order to avoid this phenomenon, the embodiment of this specification requires Limit the maximum voltage input to the switch tube and chip 1. In the embodiment of this specification, the first threshold can be used as the maximum voltage that chip 1 can carry. The corresponding first threshold can be adjusted according to the limit voltage of chip 1. For example, the limit voltage of chip 1 is 20V, then the first threshold can be set within 20V. The specific circuit of the input current protection module 5 is described in detail in the following content.

As an example of the embodiment of this specification, a power supply module 6 is provided between the MOS module 2 and the chip 1;

The energy supply module 6 is used to provide electric energy to the MOS module 2 .

It should be noted that because chip 1 has certain limitations on size, chip 1 has limited load capacity under smaller size limits. Therefore, chip 1 may not be able to drive four switch tubes at the same time, so it is necessary to The high potential (upper tube) switching tube supplies energy to meet the needs of the switching tube. However, in order to avoid the phenomenon of voltage backflow due to the light tube during the on/off process of the switch tube, it is also necessary to install an anti-backflow electronic device on the functional module to protect the power supply for the MOS module 2.

As an example of the embodiment of this specification, the chip 1 is also connected to an enabling module 7; the enabling module 7 is used to start the chip 1.

It should be noted that in some cases, such as when new energy vehicles cease fire or when batteries are replaced, in order to For safety, the voltage stabilizing circuit needs to be stopped to save power or prevent accidents. Therefore, there is an enable port on chip 1 to control the work of chip 1 through enable control with enable module 7, such as TTL level. Or stop.

As an example of the embodiment of this specification, chip 1 is also connected to an output current protection module 8;

The output current protection module 8 is used to prevent the output current of the chip 1 from exceeding the second preset threshold.

It should be noted that because the voltage stabilizing circuit in the embodiment of this specification is used for wireless charging, when the voltage stabilizing circuit outputs an appropriate voltage, the magnetic induction coil converts electrical energy into magnetic energy and charges the mobile phone. The magnetic induction coil The quality factor is usually very small, and the channel is very small, but it transmits more energy. Correspondingly, the magnetic coil cannot withstand a larger current. When the current is too large, the magnetic coil will be burned. Therefore, when the periphery of chip 1 When a short circuit occurs in the circuit, a huge current will be generated. In order to protect the downstream circuit of chip 1 (magnetic induction coil, etc.), it is necessary to connect an energy dissipating module to chip 1. In the embodiment of this specification, the output current protection module 8 To protect the downstream circuit, it can also protect chip 1 when a large current occurs in chip 1 to prevent chip 1 from being burned.

As an example of the embodiment of this specification, the chip 1 is also connected to a feedback module 9;

The feedback module 9 is used to obtain the output voltage and send the output voltage to the chip 1 to adjust the reference voltage.

It should be noted that the embodiment of this specification does not require an external reference voltage, but can adjust the reference voltage in the form of feedback through its own output voltage. In the embodiment of this specification, chip 1 has an initial voltage internally determined according to its own physical properties. , in the feedback module 9, the reference voltage can be adjusted by voltage division. The specific process will be described in detail in the following content about the circuit.

As an example of the embodiment of this specification, the chip 1 is also connected to a loop stabilization module 10;

The loop stabilization module 10 is used to improve the power supply ripple suppression ratio of the chip 1 .

It should be noted that in order to speed up the conversion speed of the power supply voltage, the loop stabilization module 10 is designed in the embodiment of this specification. Through its differential adjustment, the power supply ripple suppression ratio can be improved.

The power supply ripple rejection ratio is the ratio of the supply voltage change to the output voltage change, commonly expressed in decibels.

As an example of the embodiment of this specification, protection resistors are provided between the gates of the first switch tube 401, the second switch tube 402, the third switch tube 403 and the fourth switch tube 404 and the chip 1.

It should be noted that when overvoltage or overcurrent occurs in chip 1, chip 1 will breakdown the switch tube through the gate of the switch tube through the circuit, so the gate oxide of chip 1 needs to be protected to avoid this happening. situation.

In order to better distinguish between analog ground and power ground and avoid interference between digital circuits and analog circuits, the two ground wires are distinguished and located at different locations. In the embodiment of this specification, the power ground is abbreviated as P (Protect) ground. Analog ground is referred to as A (Analog) ground.

The chip 1 in the embodiment of this specification may be a chip 1 with 32 pins. For convenience of explanation, its first pin may be named CE, its third pin may be named PWM, and its fifth pin may be named For IPWM, name its 4th pin PG, its 14th pin AGND, its 2nd pin NC, its 7th pin NC, and its 9th pin For NC, name its 13th pin NC, name its 8th pin DT, name its 10th pin PREQ, name its 6th pin ITUNE, name its 11th pin For ILIM1, name its 12th pin ILIM2, name its first pin CE, name its first pin CE, name its first pin CE, name its 15th pin For COMP, name its 16th pin FB, its 19th pin VOUT, its 17th pin SNS2N, its 18th pin SNS2P, and its 21st pin For HD2, name its 20th pin BT2, its 22nd pin SW2, its 23rd pin LD2, and its 24th pin VCC. In order for those skilled in the art to more intuitively determine the connection relationship between the various pins of the chip 1, the following content of the embodiment of this specification will describe in detail the corresponding relationship between the above-mentioned modules and the pins.

As shown in the circuit diagram of the wireless charging voltage stabilizing circuit in Figure 3, the filter module 4 includes a first capacitor 101, a second capacitor 102 and a third capacitor 103;

One end of the first capacitor 101 is connected to the battery voltage, and the other end is connected to P ground;

One end of the second capacitor 102 is connected to one end of the first capacitor 101, and the other end is connected to P ground;

One end of the third capacitor 103 is connected to one end of the second capacitor 102, and the other end is connected to P ground.

The input current protection module 5 includes a fourth capacitor 104, a fifth capacitor 105, a first resistor 201, a second resistor 202, a third resistor 203, a fifteenth capacitor 115 and a twelfth resistor 212;

One end of the fourth capacitor 104 is connected to one end of the third capacitor 103, and the other end is connected to P ground;

One end of the first resistor 201 is connected to one end of the fourth capacitor 104, and the other end is connected to the drain of the first switch 401;

One end of the second resistor 202 is connected to one end of the fourth capacitor 104, and the other end is connected to the 32nd pin of the chip 1;

One end of the third resistor 203 is connected to the other end of the first resistor 201, and the other end of the third resistor 203 is connected to the 31st pin of chip 1;

The fifth capacitor 105 is connected to the other end of the second resistor 202 and the other end of the third resistor 203 respectively;

One end of the fifteenth capacitor 115 is connected to the 11th pin of chip 1, and the other end is connected to ground A;

One end of the twelfth resistor 212 is connected to one end of the fifteenth capacitor 115, and the other end is connected to ground A.

The power supply module 6 includes a first diode 501, a second diode 502, a sixth capacitor 106, a seventh capacitor 107 and VCC;

The anode of the first diode 501 is connected to VCC, and the cathode is connected to the 29th pin of chip 1;

One end of the sixth capacitor 106 is connected to the cathode of the first diode 501, and the other end of the sixth capacitor 106 is connected to the 27th pin of the chip 1 and the connection point of the first switch tube 401 and the second switch tube 402 respectively;

The anode of the second diode 502 is connected to VCC, and the cathode is connected to the 20th pin of chip 1;

One end of the seventh capacitor 107 is connected to the cathode of the second diode 502, and the other end of the seventh capacitor 107 is connected to the 22nd pin of the chip 1 and the connection points of the third switch tube 403 and the fourth switch tube 404 respectively.

The enabling module 7 includes a fourth resistor 204, a fifth resistor 205 and an eighth capacitor 108;

One end of the fourth resistor 204 is connected to P ground and one end of the eighth capacitor 108 respectively, and the other end of the fourth resistor 204 is connected to the enable signal and one end of the fifth resistor 205 respectively;

The other end of the fifth resistor 205 is connected to the first pin of chip 1;

The other end of the eighth capacitor 108 is connected to the other end of the third capacitor 103 and the 30th pin of the chip 1 respectively.

The output current protection module 8 includes a ninth capacitor 109, a sixth resistor 206, a seventh resistor 207, an eleventh resistor and a fourteenth capacitor 114;

One end of the sixth resistor 206 is connected to the 18th pin of chip 1, and the other end outputs a voltage;

One end of the seventh resistor 207 is connected to the 17th pin of chip 1, and the other end is suspended;

The ninth capacitor 109 is provided between one end of the sixth resistor 206 and one end of the seventh resistor 207;

One end of the eleven resistor is connected to the 12th pin of chip 1, and the other end is connected to ground A;

One end of the fourteenth capacitor 114 is connected to one end of the eleventh resistor, and the other end is connected to ground A.

The feedback module 9 includes a tenth capacitor 110, an eleventh capacitor 111, an eighth resistor 208 and a ninth resistor 209;

One end of the tenth capacitor 110 is connected to the 19th pin of chip 1 and the drain of the third switch 403 respectively, so the other end of the tenth capacitor 110 is connected to P ground;

One end of the eleventh capacitor 111 is connected to one end of the tenth capacitor 110, and the other end is connected to P ground;

One end of the eighth resistor 208 is connected to one end of the tenth capacitor 110, and the other end is connected to the 16th pin of chip 1 and one end of the ninth resistor 209 respectively;

The other end of the ninth resistor 209 is connected to P ground.

The loop stabilization module 10 includes a twelfth capacitor 112, a thirteenth capacitor 113 and a tenth resistor 210;

One end of the twelfth capacitor 112 is connected to the 15th pin of chip 1, and the other end is connected to ground A;

One end of the tenth resistor 210 is connected to the 15th pin of chip 1, and the other end is connected to the thirteenth capacitor 113;

The other end of the thirteenth capacitor 113 is connected to ground A.

It should be noted that the gate of the first switch tube 401 is connected to the 28th pin of the chip 1 .

It should be noted that the gate of the second switch 402 is connected to the 26th pin of the chip 1 .

It should be noted that the gate of the third switch 403 is connected to the 21st pin of the chip 1 .

It should be noted that the gate of the fourth switch 404 is connected to the 23rd pin of the chip 1 .

Protection resistors are provided between the gates of the first switch tube 401, the second switch tube 402, the third switch tube 403 and the fourth switch tube 404 and the chip 1.

In the embodiment of this specification, the resistance values of the protection resistors are the same, so in order to reduce the length, the description of the embodiment of this specification will not be further elaborated.

It should be noted that the control signal in the embodiment of this specification can be imported from the 3rd pin to control the on/off frequency of the switch tube. The control signal can be a PMW pulse wave or a sawtooth wave. Through the different duty of the waveform Ratio, you can adjust the turn-on/cut-off frequency.

According to the technical manual, the second preset threshold in the embodiment of this specification is related to the internal fixed voltage of chip 1, the eleventh resistor 211, the sixth resistor 206 and the seventh resistor 207. The specific formula is: Where V _ref is a fixed voltage, R _ILIM2 is the eleventh resistor 211 , R _ss2 is the sixth resistor 206 , and R _SNS2 is the seventh resistor 207 . Through the above formula, the output current can be adjusted to limit the output current to not be higher than the calculated value.

According to the technical manual, the first threshold in the embodiment of this specification is related to the internal fixed voltage of chip 1, the twelfth resistor 212, the second resistor 202, the third resistor 203 and the first resistor 201. The specific formula is: Where V _ref is a fixed voltage, R _ILIM1 is the twelfth resistor 212 , R _ss2 is the average value of the second resistor 202 and the third resistor 203 , and R _SNS2 is the first resistor 201 . Through the above formula, the input current can be adjusted to limit the input current not to be higher than the calculated value.

It should be noted that the fixed voltage V _ref in the embodiment of this specification can be 1.22V. The actual output value of the output voltage is affected by the PWM duty cycle. According to the manual, V _out =V _set *(1/6+5 /6D), where V _out is the actual output voltage, that is, the output voltage on the upper side of the eleventh capacitor 111. This output voltage is supplied to the lower-level circuit, and V _set is the maximum voltage that the circuit can actually output. This specification implements The V _set in the example can be 20.39V. According to the formula, when the PWM duty cycle D is 0, V _out is 3.4V. That is to say, V _out can change linearly between 3.4-20.39V, so adjust the PWM duty cycle The air ratio can output different stabilized voltages. Correspondingly, it can easily adapt to the charging protocol voltages of different mobile phone brands, such as 5V, 8V or 12V, etc.

In order to facilitate understanding, the basic peripheral circuits of the chip 1 in the embodiments of this specification are not described in words. Those skilled in the art can determine the connection methods of pins that are not described in words based on the connection relationships in the figures. The embodiments of this specification will not be described here. Repeat.

An embodiment of this specification also provides a power supply, which is provided with a wireless charging voltage stabilizing circuit.

Embodiments of this specification also provide a new energy vehicle, which is equipped with the above-mentioned power supply.

It should also be understood that in the embodiment of this specification, the term "and/or" is only an association relationship describing associated objects, indicating that three relationships can exist. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in the embodiment of this specification generally indicates that the related objects are in an "or" relationship.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in the embodiments of this specification can be implemented with electronic hardware, computer software, or a combination of both. In order to clearly illustrate the hardware and software interchangeability. In the above description, the composition and steps of each example have been generally described according to functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementations should not be considered to be beyond the scope of the embodiments of this specification.

Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be described again here.

In the several embodiments provided in the embodiments of this specification, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented. In addition, the coupling or direct coupling or communication connection between each other shown or discussed may be an indirect coupling or communication connection through some interfaces, devices or units, or may be electrical, mechanical or other forms of connection.

A unit described as a separate component may or may not be physically separate. A component shown as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of this specification.

In addition, each functional unit in each embodiment of this specification may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above integrated units can be implemented in the form of hardware or software functional units.

In the embodiments of this specification, specific examples are used to illustrate the principles and implementation methods of the embodiments of this specification. The description of the above embodiments is only used to help understand the methods and core ideas of the embodiments of this specification; at the same time, for those in this field, Ordinary technicians, based on the ideas of the embodiments of this specification, can understand the specific implementation methods and application scope. There will be changes in the above. In summary, the content of this specification should not be understood as limiting the embodiments of this specification.

Claims

A wireless charging voltage stabilizing circuit, characterized by including:

Chip, used to compare the battery voltage with the reference voltage and output a control signal to control the MOS module to switch the boost/buck topology mode;

The chip controls the duty cycle of the switch tube of the MOS module based on the periodic signal from the control unit.
The wireless charging voltage stabilizing circuit according to claim 1, wherein the chip is configured as:

When the battery voltage is higher than the reference voltage, the chip controls the MOS module to switch to the buck topology mode;

When the battery voltage is lower than the reference voltage, the chip controls the MOS module to switch to the boost topology mode.
The wireless charging voltage stabilizing circuit according to claim 2, wherein the MOS module includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first inductor;

The gates of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all connected to the chip and receive the control signal;

The drain of the first switch tube is connected to the battery voltage;

The source of the first switch is connected to the drain of the second switch;

The drain of the third switch tube is connected to the output port.

The source of the third switch is connected to the drain of the fourth switch;

The source of the second switch is connected to the source of the fourth switch and grounded;

The first inductor is provided between a connection point between the first switch tube and the second switch tube and a connection point between the third switch tube and the fourth switch tube.
The wireless charging voltage stabilizing circuit according to claim 3, characterized in that when the MOS module switches to the buck topology mode, the chip controls the first switch tube and the second switch tube to conduct periodic complementary conduction. On, the third switch tube is controlled to be on, and the fourth switch tube is controlled to be off.
The wireless charging voltage stabilizing circuit according to claim 3, characterized in that when the MOS module switches to the boost topology mode, the chip controls the third switch tube and the fourth switch tube to periodically conduct complementary conduction. On, the first switch tube is controlled to be on, and the second switch tube is controlled to be off.
The wireless charging voltage stabilizing circuit according to claim 3, characterized in that a filter module is provided between the chip and the battery voltage;

The filter module is used to filter the battery voltage.
The wireless charging voltage stabilizing circuit according to claim 6, wherein the filter module includes a first capacitor, a second capacitor and a third capacitor;

One end of the first capacitor is connected to the battery voltage, and the other end is connected to P ground;

One end of the second capacitor is connected to one end of the first capacitor, and the other end is connected to P ground;

One end of the third capacitor is connected to one end of the second capacitor, and the other end is connected to P ground.
The wireless charging voltage stabilizing circuit according to claim 7, characterized in that an input current protection module is provided between the chip and the battery voltage;

The input current protection module is used to prevent the battery voltage received by the chip from exceeding a first threshold.
The wireless charging voltage stabilizing circuit according to claim 8, wherein the input current protection module includes a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a fifteenth capacitor and a third resistor. twelve resistors;

One end of the fourth capacitor is connected to one end of the third capacitor, and the other end is connected to P ground;

One end of the first resistor is connected to one end of the fourth capacitor, and the other end is connected to the drain of the first switch tube;

One end of the second resistor is connected to one end of the fourth capacitor, and the other end is connected to the chip;

One end of the third resistor is connected to the other end of the first resistor, and the other end of the third resistor is connected to the chip;

The fifth capacitor is connected to the other end of the second resistor and the other end of the third resistor respectively;

One end of the fifteenth capacitor is connected to the chip, and the other end is connected to ground A;

One end of the twelfth resistor is connected to one end of the fifteenth capacitor, and the other end is connected to ground A.
The wireless charging voltage stabilizing circuit according to claim 3, characterized in that an energy supply module is provided between the MOS module and the chip;

The energy supply module is used to provide electric energy to the MOS module.
The wireless charging voltage stabilizing circuit according to claim 10, wherein the energy supply module includes a first diode, a second diode, a sixth capacitor, a seventh capacitor and VCC;

The anode of the first diode is connected to the VCC, and the cathode is connected to the chip;

One end of the sixth capacitor is connected to the cathode of the first diode, and the other end of the sixth capacitor is connected to the connection points of the chip and the first switch tube and the second switch tube respectively;

The anode of the second diode is connected to the VCC, and the cathode is connected to the chip;

One end of the seventh capacitor is connected to the cathode of the second diode, and the other end of the seventh capacitor is connected to the connection points of the chip and the third switch tube and the fourth switch tube respectively.
The wireless charging voltage stabilizing circuit according to claim 7, wherein the chip is also connected to an enabling module;

The enabling module is used to start the chip.
The wireless charging voltage stabilizing circuit according to claim 12, wherein the enabling module includes a fourth resistor, a fifth resistor and an eighth capacitor;

One end of the fourth resistor is connected to P ground and one end of the eighth capacitor respectively, and the other end of the fourth resistor is connected to the enable signal and one end of the fifth resistor respectively;

The other end of the fifth resistor is connected to the chip;

The other end of the eighth capacitor is connected to the other end of the third capacitor and the chip respectively.
The wireless charging voltage stabilizing circuit according to claim 3, characterized in that the chip is also connected to an output current protection module;

The output current protection module is used to prevent the output current of the chip from exceeding a second preset threshold.
The wireless charging voltage stabilizing circuit according to claim 14, wherein the output current protection module includes a ninth capacitor, a sixth resistor, a seventh resistor, an eleventh resistor and a fourteenth capacitor;

One end of the sixth resistor is connected to the chip, and the other end outputs a voltage;

One end of the seventh resistor is connected to the chip, and the other end is suspended;

The ninth capacitor is provided between one end of the sixth resistor and one end of the seventh resistor;

One end of the eleven resistors is connected to the chip, and the other end is connected to ground A;

One end of the fourteenth capacitor is connected to one end of the eleventh resistor, and the other end is connected to ground A.
The wireless charging voltage stabilizing circuit according to claim 15, wherein the chip is also connected to a feedback module;

The feedback module is used to obtain the output voltage of the output port and send the output voltage to the chip to adjust the reference voltage.
The wireless charging voltage stabilizing circuit according to claim 16, wherein the feedback module includes a tenth capacitor, an eleventh capacitor, an eighth resistor and a ninth resistor;

One end of the tenth capacitor is connected to the drain of the chip and the third switch respectively, and the other end of the tenth capacitor is connected to P ground;

One end of the eleventh capacitor is connected to one end of the tenth capacitor, and the other end is connected to P ground;

One end of the eighth resistor is connected to one end of the tenth capacitor, and the other end is connected to one end of the chip and the ninth resistor respectively;

The other end of the ninth resistor is connected to P ground.
The wireless charging voltage stabilizing circuit according to claim 1, wherein the chip is also connected to a loop stabilization module;

The loop stabilization module is used to improve the power supply ripple suppression ratio of the chip.
The wireless charging voltage stabilizing circuit according to claim 18, wherein the loop stabilization module includes a twelfth capacitor, a thirteenth capacitor and a tenth resistor;

One end of the twelfth capacitor is connected to the chip, and the other end is connected to ground A;

One end of the tenth resistor is connected to the chip, and the other end is connected to the thirteenth capacitor;

The other end of the thirteenth capacitor is connected to ground A.
The wireless charging voltage stabilizing circuit according to claim 3, characterized in that the gates of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are connected with the gate electrode of the switch tube. There are protection resistors between the chips.
A power supply, characterized in that the power supply is provided with the wireless charging voltage stabilizing circuit according to any one of claims 1-20.
A new energy vehicle, characterized in that the new energy vehicle is equipped with a power supply as claimed in claim 21.