Vehicle-mounted charger

Abstract

The utility model relates to the technical field of vehicle-mounted charging equipment, in particular to a vehicle-mounted charger, which comprises a main body, an expansion charging seat, a power supply input connector, a lead, a first circuit board and a second circuit board, the power supply input connector and the second circuit board are arranged on the main body, and the first circuit board is arranged in the expansion charging seat. A first quick charging circuit module and a first interface module are arranged on the first circuit board, a second quick charging circuit module and a second interface module are arranged on the second circuit board, and the second quick charging circuit module is connected with a power input connector and the second interface module; the first fast charging circuit module comprises a fast charging protocol control chip, a buck-boost driving chip and a buck-boost circuit unit, the second fast charging circuit module outputs a first level signal to the fast charging protocol control chip, and the fast charging protocol control chip controls the buck-boost driving chip to output a corresponding PWM signal according to the first level signal. According to the invention, a plurality of electronic devices can be charged at the same time at a relatively high charging speed.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle-mounted charging equipment technical field, especially a vehicle-mounted charger. BACKGROUND

[0002] The vehicle-mounted charger is a kind of accessory for charging electronic product with vehicle-mounted power supply, it is usually inserted into the cigarette lighter hole of vehicle, extends charging interface / charging expansion port, to supply charging, it is widely used to charge lithium battery of various portable, handheld equipment.

[0003] The existing vehicle-mounted charger is usually provided with DC-DC conversion circuit, DC-DC conversion circuit is arranged in the main body of vehicle-mounted charger, charging power is small, cannot satisfy the demand of simultaneously charging multiple electronic equipment at faster speed. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the embodiment of the utility model is to provide a vehicle-mounted charger to solve the problem that the vehicle-mounted charger in the prior art cannot satisfy the demand of charging multiple electronic equipment at faster speed.

[0005] The utility model discloses a vehicle-mounted charger, including main part, expansion charging seat, power input connector, wire, first circuit board and second circuit board, the power input connector with second circuit board all are located on the main part, first circuit board is located in expansion charging seat, be provided with first quick charging circuit module and first interface module on the first circuit board, be provided with second quick charging circuit module and second interface module on the second circuit board, second quick charging circuit module connects the power input connector with second interface module, to obtain vehicle-mounted power supply voltage, and supply power to outside through second interface module;

[0006] First quick charging circuit module includes quick charging protocol control chip, boost-buck drive chip and boost-buck circuit unit, quick charging protocol control chip connects boost-buck drive chip with first interface module, the control end of boost-buck circuit unit is connected with boost-buck drive chip, voltage input end is connected with power input connector through wire, to obtain vehicle-mounted power supply voltage, voltage output end is connected with first interface module, and supply power to outside through first interface module;

[0007] Among them, second quick charging circuit module is connected with quick charging protocol control chip, and first level signal is output to quick charging protocol control chip, and quick charging protocol control chip controls boost-buck drive chip output corresponding PWM signal according to first level signal.

[0008] Optionally, the vehicle-mounted charger further comprises a third circuit board arranged in the extended charging base, the third circuit board is provided with a third fast charging circuit module and a third interface module, the third fast charging circuit module is connected with the fast charging protocol control chip and the third interface module, the third interface module is used for supplying power to the outside, and the third fast charging circuit module is connected with the power input connector through the wire, the third fast charging circuit module outputs a second level signal to the fast charging protocol control chip, and the fast charging protocol control chip controls the boost-buck driving chip to output a corresponding PWM signal according to the second level signal.

[0009] Optionally, the boost-buck circuit unit comprises a first gallium nitride switch tube, a second gallium nitride switch tube, a third gallium nitride switch tube, a fourth gallium nitride switch tube and a first energy storage inductor, the gates of the first gallium nitride switch tube, the second gallium nitride switch tube, the third gallium nitride switch tube and the fourth gallium nitride switch tube are connected with the boost-buck control chip, the source of the first gallium nitride switch tube and the drain of the second gallium nitride switch tube are connected to one end of the first energy storage inductor, the drain of the first gallium nitride switch tube is connected with the power input connector, the source of the second gallium nitride switch tube is grounded, the source of the third gallium nitride switch tube and the drain of the fourth gallium nitride switch tube are connected to the other end of the first energy storage inductor, the drain of the third gallium nitride switch tube is connected with the first interface module, and the source of the fourth gallium nitride switch tube is grounded.

[0010] Optionally, the first interface module comprises a first USB-C interface, the first USB-C interface is connected with the drain of the third gallium nitride switch tube and the fast charging protocol control chip.

[0011] Optionally, the second fast charging circuit module comprises a first fast charging protocol charging chip and a second energy storage inductor, the first fast charging protocol charging chip is connected with one end of the second energy storage inductor and the second interface module, and is connected with the power input connector through the wire, the other end of the second energy storage inductor is connected with the second interface module, a communication pin of the first fast charging protocol charging chip is connected with a first transmission pin of the fast charging protocol control chip, and the first fast charging protocol charging chip outputs a first level signal to the fast charging protocol control chip.

[0012] Optionally, the second fast charging circuit module comprises a first configuration resistor, one end of the first configuration resistor is connected with a clock input pin of the first fast charging protocol charging chip, and the other end is grounded.

[0013] Optionally, the second interface module comprises a second USB-C interface, the second USB-C interface is connected with the other end of the second energy storage inductor and the first fast charging protocol charging chip.

[0014] Optionally, the third fast charging circuit module comprises a second fast charging protocol charging chip and a third energy storage inductor, the second fast charging protocol charging chip is connected with the power input connector, one end of the third energy storage inductor and the third interface module, the other end of the third energy storage inductor is connected with the third interface module, and a communication pin of the second fast charging protocol charging chip is connected with a second transmission pin of the fast charging protocol control chip to output a second level signal to the fast charging protocol control chip.

[0015] Optionally, the third fast charging circuit module further comprises a second configuration resistor, one end of the second configuration resistor is connected with a clock input pin of the second fast charging protocol charging chip, and the other end is grounded.

[0016] Optionally, the third interface module comprises a third USB-C interface and a USB-A interface, and the third USB-C interface and the USB-A interface are connected with the other end of the third energy storage inductor and the second fast charging protocol charging chip.

[0017] Compared with the prior art, the vehicle charger provided in the embodiment of the utility model has the beneficial effects that: the vehicle charger is provided with a main body, an expansion charging base, a power input connector, a wire, a first circuit board and a second circuit board, the power input connector and the second circuit board are arranged on the main body, the first circuit board is arranged in the expansion charging base, a first fast charging circuit module and a first interface module are arranged on the first circuit board, a second fast charging circuit module and a second interface module are arranged on the second circuit board, the second fast charging circuit module is connected with the power input connector and the second interface module to obtain a vehicle power voltage and supply power to the outside through the second interface module, a boost-buck circuit unit of the first fast charging circuit module is connected with the power input connector through the wire to obtain the vehicle power voltage, the second fast charging circuit module outputs a first level signal to a fast charging protocol control chip of the first fast charging circuit module, the fast charging protocol control chip controls a boost-buck driving chip to output a corresponding PWM signal according to the first level signal, the boost-buck circuit unit is driven to output power energy of corresponding charging power through the first interface module, the main body and the expansion charging base connected with a plurality of electronic devices are simultaneously charged at a faster charging speed, and in the application of the charging scene, users close to the main body and the expansion charging base of the vehicle charger can select corresponding interface modules to charge the electronic devices, and the user experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The technical scheme of the utility model will be further described in detail below with reference to the drawings and embodiments, and the drawings show that:

[0019] Figure 1 is a perspective view of the vehicle charger provided in the embodiment of the utility model;

[0020] Figure 2It is the circuit structure schematic view of the vehicle charger provided by the embodiment of the utility model;

[0021] Figure 3 It is the module schematic view of the vehicle charger provided by the embodiment of the utility model;

[0022] Figure 4 It is the partial circuit schematic view of the fast charging protocol control chip and the first USB-C interface connection provided by the embodiment of the utility model;

[0023] Figure 5 It is the partial circuit schematic view of the boost-buck driving chip and the boost-buck circuit unit connection provided by the embodiment of the utility model;

[0024] Figure 6 It is the partial circuit schematic view of the second fast charging circuit module and the second interface module connection provided by the embodiment of the utility model;

[0025] Figure 7 It is the partial circuit schematic view of the third fast charging circuit module and the third interface module connection provided by the embodiment of the utility model.

[0026] The reference signs in the drawing are:

[0027] 10, main body;20, extension charging base;30, power input connector;40, wire;50, first circuit board;51, first fast charging circuit module;511 (U1), fast charging protocol control chip;512 (U2), boost-buck driving chip;513, boost-buck circuit unit;52, first interface module;60, second circuit board;61, second fast charging circuit module;62, second interface module;70, third circuit board;71, third fast charging circuit module;72, third interface module;

[0028] M1, first gallium nitride switch tube;M2, second gallium nitride switch tube;M3, third gallium nitride switch tube;M4, fourth gallium nitride switch tube;L1, first energy storage inductor;J1, first USB-C interface;J2, second USB-C interface;J3, third USB-C interface;J4, USB-A interface;U3, first fast charging protocol charging chip;U4, second fast charging protocol charging chip;L2, second energy storage inductor;L3, third energy storage inductor;R1, first configuration resistor;R2, second configuration resistor. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0030] The embodiment of the utility model provides a kind of vehicle charger, such as Figures 1 to 3As shown, the vehicle-mounted charger comprises a main body 10, an expansion charging base 20, a power input connector 30, a wire 40, a first circuit board 50 and a second circuit board 60, the power input connector 30 and the second circuit board 60 are arranged on the main body 10, the first circuit board 50 is arranged in the expansion charging base 20, the first circuit board 50 is provided with a first fast charging circuit module 51 and a first interface module 52, the second circuit board 60 is provided with a second fast charging circuit module 61 and a second interface module 62, the second fast charging circuit module 61 is connected with the power input connector 30 and the second interface module 62 to obtain the vehicle-mounted power voltage and supply power to the outside through the second interface module 62.

[0031] The first fast charging circuit module 51 comprises a fast charging protocol control chip 511 (U1), a boost-buck driving chip 512 (U2) and a boost-buck circuit unit 513, the fast charging protocol control chip 511 (U1) is connected with the boost-buck driving chip 512 (U2) and the first interface module 52, the control end of the boost-buck circuit unit 513 is connected with the boost-buck driving chip 512 (U2), the voltage input end is connected with the power input connector 30 through the wire 40 to obtain the vehicle-mounted power voltage, the voltage output end is connected with the first interface module 52 and supplies power to the outside through the first interface module 52.

[0032] The second fast charging circuit module 61 is connected with the fast charging protocol control chip 511 (U1) and outputs a first level signal to the fast charging protocol control chip 511 (U1), the fast charging protocol control chip 511 (U1) controls the boost-buck driving chip 512 (U2) to output a corresponding PWM signal according to the first level signal.

[0033] The application sets the main body 10, the extended charging base 20, the power input connector 30, the wire 40, the first circuit board 50 and the second circuit board 60, the power input connector 30 and the second circuit board 60 are arranged on the main body 10, the first circuit board 50 is arranged in the extended charging base 20, the first circuit board 50 is provided with the first fast charging circuit module 51 and the first interface module 52, the second circuit board 60 is provided with the second fast charging circuit module 61 and the second interface module 62, the second fast charging circuit module 61 is connected with the power input connector 30 and the second interface module 62 to obtain the vehicle-mounted power supply voltage and supply power to the outside through the second interface module 62, the first fast charging circuit module 51 is connected with the power input connector 30 through the wire 40 to obtain the vehicle-mounted power supply voltage, the second fast charging circuit module 61 outputs the first level signal to the fast charging protocol control chip 511 (U1) of the first fast charging circuit module 51, the fast charging protocol control chip 511 (U1) controls the output of the corresponding PWM signal of the voltage-lifting driving chip 512 (U2) according to the first level signal, and the voltage-lifting circuit unit 513 outputs the corresponding charging power through the first interface module 52, so as to realize the charging of the main body 10 and the plurality of electronic devices connected with the charging base at a faster charging speed, and the users close to the vehicle-mounted charger can select the corresponding interface module to charge the electronic devices in the application scene, thereby improving the user experience.

[0034] When the first level signal output by the second fast charging circuit module 61 is low, the second fast charging circuit module 61 is in a charging working state, the corresponding connected second interface module 62 has output power to charge the external electronic device, the fast charging protocol control chip 511 (U1) controls the output of the corresponding first PWM signal of the voltage-lifting driving chip 512 (U2), and the voltage-lifting circuit unit 513 outputs the corresponding charging power under the driving control of the first PWM signal to charge the electronic device connected with the first interface module 52. When the first level signal output by the second fast charging circuit module 61 is high, the second fast charging circuit module 61 is not in a charging working state, the corresponding connected second interface module 62 does not output power to the outside, the fast charging protocol control chip 511 (U1) controls the output of the corresponding second PWM signal of the voltage-lifting driving chip 512 (U2), and the voltage-lifting circuit unit 513 outputs the corresponding charging power under the driving control of the second PWM signal to charge the electronic device connected with the first interface module 52, that is, the first fast charging circuit module 51 can output two charging powers corresponding to the first PWM signal and the second PWM signal.

[0035] In specific implementation, the two charging powers can be 140W and 100W, or other higher charging powers, such as 60W, 45W, etc.

[0036] The first fast charging circuit module 51 and the second fast charging circuit module 61 are separated on the main body 10 and the extended charging base 20, and the first fast charging circuit module 51 obtains the vehicle power supply voltage through the lead 40 by the step-up and step-down circuit unit 513, allowing the main body 10 and the extended charging base 20 to extend a certain distance, meeting the charging needs of users at different distances, such as the front row users on the vehicle can charge the electronic device through the second interface module 62 on the main body 10, and the rear row users can charge the electronic device through the first interface module 52 on the extended charging base 20.

[0037] The power input connector 30 can be inserted into the cigarette lighter hole of the vehicle to obtain the vehicle power supply voltage.

[0038] The fast charging protocol control chip 511 (U1) and the step-up and step-down driving chip 512 (U2) can be realized by existing chips. For example, the fast charging protocol control chip can adopt SW2335, SW2301H or SW2507 chips. The step-up and step-down driving chip 512 (U2) can adopt WP3236, PL5501 chips. In the embodiment, the fast charging protocol control chip 511 (U1) adopts the SW2335 chip, and the step-up and step-down driving chip 512 (U2) adopts the WP3236 chip.

[0039] Reference Figures 1 to 3 In the optional embodiment of the application, the vehicle charger further comprises a third circuit board 70 arranged in the extended charging base 20, the third circuit board 70 is provided with a third fast charging circuit module 71 and a third interface module 72, the third fast charging circuit module 71 is connected with the fast charging protocol control chip 511 (U1) and the third interface module 72, and is connected with the power input connector 30 through the lead 40, the third fast charging circuit module 71 outputs a second level signal to the fast charging protocol control chip 511 (U1), and supplies power to the outside through the third interface module 72, and the fast charging protocol control chip 511 (U1) also controls the step-up and step-down driving chip 512 (U2) to output a corresponding PWM signal according to the second level signal.

[0040] By setting the third fast charging circuit module 71 in the extended charging base 20, the vehicle charger can charge more electronic devices through the third interface module 72 connected by the third fast charging circuit module 71. The third fast charging circuit module 71 outputs a second level signal to the fast charging protocol control chip 511 (U1), and the fast charging protocol control chip 511 (U1) also controls the boost-buck driving chip 512 (U2) to output a corresponding PWM signal according to the second level signal. The boost-buck circuit unit 513 outputs power energy corresponding to the charging power through the first interface module 52, so that the electronic devices connected by the more interface modules of the vehicle charger can be charged at a faster charging speed. Moreover, the first fast charging circuit module 51 and the third fast charging circuit module 71 are separated on two circuit boards, so that the circuits of the first fast charging circuit module 51 and the third fast charging circuit module 71 can be designed differently according to the specific circuits of the first fast charging circuit module 51 and the third fast charging circuit module 71, and the performance of each circuit board can be optimized. Heat can be better managed and heat dissipation efficiency can be improved.

[0041] When the first level signal output by the second fast charging circuit module 61 is low, corresponding to the second fast charging circuit module 61 being in a charging working state, the second interface module 62 connected has output power to charge the external electronic device, and the second level signal output by the third fast charging circuit module 71 is also low, corresponding to the third fast charging circuit module 71 being in a charging working state, the third interface module 72 connected has output power to charge the external electronic device, the fast charging protocol control chip 511 (U1) controls the boost-buck driving chip 512 (U2) to output a corresponding third PWM signal, and the boost-buck circuit unit 513 outputs power energy corresponding to the charging power under the driving control of the third PWM signal to charge the electronic device connected to the first interface module 52.

[0042] When one of the first level signal output by the second fast charging circuit module 61 and the second level signal output by the third fast charging circuit module 71 is low, corresponding to one of the second fast charging circuit module 61 and the third fast charging circuit module 71 being in a charging state, the fast charging protocol control chip 511 (U1) controls the boost-buck driving chip 512 (U2) to output a corresponding first PWM signal, and the boost-buck circuit unit 513 outputs power energy corresponding to the charging power under the driving control of the first PWM signal to charge the electronic device connected to the first interface module 52.

[0043] When the first level signal output by the second fast charging circuit module 61 and the second level signal output by the third fast charging circuit module 71 are both high levels, corresponding to the second fast charging circuit module 61 and the third fast charging circuit module 71 not being in the charging state, the fast charging protocol control chip 511 (U1) controls the boost-buck driving chip 512 (U2) to output a corresponding second PWM signal, and the boost-buck circuit unit 513 outputs a corresponding charging power under the driving control of the second PWM signal, and charges the electronic equipment externally connected to the first interface module 52. That is, the first fast charging circuit module 51 can output three charging powers corresponding to the first PWM signal, the second PWM signal and the third PWM signal.

[0044] In specific implementation, the three charging powers can be 140W, 100W and 90W, or other higher charging powers.

[0045] With reference to Figure 4 and Figure 5 , the preferred embodiment of the boost-buck circuit unit 513 is provided.

[0046] The boost-buck circuit unit 513 comprises a first gallium nitride switch tube M1, a second gallium nitride switch tube M2, a third gallium nitride switch tube M3, a fourth gallium nitride switch tube M4 and a first energy storage inductor L1. The gates of the first gallium nitride switch tube M1, the second gallium nitride switch tube M2, the third gallium nitride switch tube M3 and the fourth gallium nitride switch tube M4 are connected with a boost-buck control chip. The source of the first gallium nitride switch tube M1 and the drain of the second gallium nitride switch tube M2 are connected to one end of the first energy storage inductor L1. The drain of the first gallium nitride switch tube M1 is connected to a power input terminal 30. The source of the second gallium nitride switch tube M2 is grounded. The source of the third gallium nitride switch tube M3 and the drain of the fourth gallium nitride switch tube M4 are connected to the other end of the first energy storage inductor L1. The drain of the third gallium nitride switch tube M3 is connected to the first interface module 52. The source of the fourth gallium nitride switch tube M4 is grounded.

[0047] The first gallium nitride switch tube M1, the second gallium nitride switch tube M2, the third gallium nitride switch tube M3 and the fourth gallium nitride switch tube M4 cooperate with the first energy storage inductor L1 to convert the vehicle power input by the power input terminal 30 into a suitable voltage, and supply power externally through the corresponding first interface module 52, so that the charging speed is fast.

[0048] The gallium nitride switch tube is used as the switch tube of the boost-buck circuit unit 513, has a fast switching speed, can quickly switch the circuit, reduces energy loss during switching, and improves overall efficiency; has low conduction and switching loss, can provide higher conversion efficiency than traditional silicon-based switch tubes, and has smaller energy loss; the high power density and low loss characteristics of the gallium nitride switch tube can realize more compact circuit design, which is beneficial to miniaturization design of the vehicle charger; the gallium nitride switch tube has good thermal characteristics and generates less heat, which is helpful to simplify the heat dissipation design and improve the stability and reliability of the system.

[0049] With reference to Figure 4 and Figure 5 , the utility model embodiment provides a preferred embodiment of first interface module 52.

[0050] The first interface module 52 includes a first USB-C interface J1, and the first USB-C interface J1 is connected to the drain of the third gallium nitride switch tube M3 and a fast charging protocol control chip 511 (U1).

[0051] By using the first USB-C interface J1 as the interface for external charging, the first USB-C interface J1 supports higher power transmission and can realize faster charging speed; the first USB-C interface J1 adopts a reversible design and can correctly connect external electronic devices regardless of the insertion direction, eliminates the reverse insertion problem of the traditional USB interface, and improves user experience; more and more charging lines use the USB-C interface, and the first USB-C interface J1 can more conveniently provide charging function for users.

[0052] In other embodiments, the first interface module 52 can also use a lighting interface or other fast charging interfaces suitable for fast charging, or include the first USB-C interface J1 and the lighting interface.

[0053] With reference to Figure 3 , Figure 4 and Figure 6 , the utility model embodiment provides a preferred embodiment of a second fast charging circuit module 61.

[0054] The second fast charging circuit module 61 includes a first fast charging protocol charging chip U3 and a second energy storage inductor L2, the first fast charging protocol charging chip U3 is connected to one end of the second energy storage inductor L2 and a second interface module 62, and is connected to a power input connector 30 through a wire 40, the other end of the second energy storage inductor L2 is connected to the second interface module 62, and a communication pin (such as a pin 2) of the first fast charging protocol charging chip U3 is connected to the second interface module 62. Figure 6The "power-down 2" pin shown) is connected to the first transmission pin of the fast charging protocol control chip 511 (U1) (such as Figure 4 The "power-down 2" pin is connected to the first transmission pin of the fast charging protocol control chip 511 (U1) (such as

[0055] The first fast charging protocol charging chip U3 and the second energy storage inductor L2 are configured to convert the vehicle power supply voltage input by the power input terminal 30 into a suitable charging voltage, and then supply power to the outside through the second interface module 62. The second fast charging circuit module 61 has high circuit integration, which is conducive to the miniaturization of the second circuit board 60 and the vehicle charger.

[0056] The first fast charging protocol charging chip U3 can output a low-level signal to the fast charging protocol control chip 511 (U1) through its communication pin when it is in a charging working state, and output a high-level signal to the fast charging protocol control chip 511 (U1) through its communication pin when it is not in a charging working state.

[0057] Further, the second fast charging circuit module 61 includes a first configuration resistor R1, one end of which is connected to the clock input pin of the first fast charging protocol charging chip U3, and the other end is grounded. By setting the first configuration resistor R1, the designer can select the first configuration resistor R1 with the corresponding resistance value according to the needs, so that the second fast charging circuit module 61 outputs different higher charging power.

[0058] In other embodiments, the second fast charging circuit module 61 can also use control chips and step-up / step-down topology circuits to realize fast charging with protocol chips. In this embodiment, the first fast charging protocol charging chip U3 is used in cooperation with the second energy storage inductor L2, which has high circuit integration and is conducive to the miniaturization of the vehicle charger.

[0059] Continuing to refer to Figure 3 , Figure 4 and Figure 6In an alternative embodiment of the present application, the second interface module 62 comprises a second USB-C interface J2, which is connected to the other end of the second energy storage inductor L2 and the first fast charging protocol charging chip U3.

[0060] In the second fast charging circuit module 61, by using the second USB-C interface J2 as the interface for external charging, the second USB-C interface J2 supports higher power transmission and can achieve faster charging speed; it adopts a reversible design, which can correctly connect external electronic devices regardless of the insertion direction, eliminating the reverse insertion problem of traditional USB interfaces and improving user experience; more and more charging lines use USB-C interfaces, and using the second USB-C interface J2 can more conveniently provide charging functions for users. The first fast charging protocol charging chip U3 is connected to the second USB-C interface J2, which can control the protocol communication with external electronic devices through the second USB-C interface J2 and perform corresponding protocol charging.

[0061] In other embodiments, the second interface module 62 can also use a lighting interface, or include a second USB-C interface J2 and a lighting interface.

[0062] Reference Figure 3 、 Figure 4 and Figure 7 The third fast charging circuit module 71 comprises a second fast charging protocol charging chip U4 and a third energy storage inductor L3, the second fast charging protocol charging chip U4 is connected to the power input terminal 30, one end of the third energy storage inductor L3, and the third interface module 72, the other end of the third energy storage inductor L3 is connected to the third interface module 72, and the communication pin (such as the reduced power 1 pin shown in Figure 7 ) of the second fast charging protocol charging chip U4 is connected to the second transmission pin (such as the reduced power 1 pin shown in Figure 4 ) of the fast charging protocol control chip 511 (U1), and outputs a second level signal to the fast charging protocol control chip 511 (U1).

[0063] By setting the second fast charging protocol charging chip U4 and the second energy storage inductor L2, the vehicle-mounted power supply voltage input by the power input terminal 30 is converted into a suitable charging voltage, and then supplied to the outside through the third interface module 72, the circuit integration of the third fast charging circuit module 71 is high, which is conducive to the miniaturization of the third circuit board 70 and the miniaturization of the vehicle-mounted charger. The second fast charging protocol charging chip U4 can output a low-level signal to the fast charging protocol control chip 511 (U1) through its communication pin when it is in a charging working state, and output a high-level signal to the fast charging protocol control chip 511 (U1) when it is not in a charging working state.

[0064] The second fast charging protocol charging chip U4 can also be implemented by using an existing chip, such as a chip of model SW3537, SW3526, SW3536, and the like. In the embodiment, the second fast charging protocol charging chip U4 is a chip of model SW3537, and a communication pin of the second fast charging protocol charging chip U4 is an SDA pin of the chip of model SW3537. When the fast charging protocol control chip 511 (U1) is a chip of model SW2335, a second transmission pin of the fast charging protocol control chip 511 (U1) is another GPIO pin of the chip of model SW2335.

[0065] Further, the third fast charging circuit module 71 further includes a second configuration resistor R2, one end of the second configuration resistor R2 is connected to a clock input pin of the second fast charging protocol charging chip U4, and the other end is grounded. By setting the second configuration resistor R2, a designer can select a second configuration resistor R2 with a corresponding resistance value according to needs, so that the second fast charging circuit module 61 outputs electrical energy with different higher charging power.

[0066] In other embodiments, the third fast charging circuit module 71 can also be implemented by using a control chip and a boost-buck topology circuit in cooperation with a protocol chip to realize fast charging. In the embodiment, the second fast charging protocol charging chip U4 cooperates with the third energy storage inductor L3, and the circuit has high integration, which is conducive to the miniaturization of the vehicle charger.

[0067] Continuing to refer to Figure 3 , Figure 4 and Figure 7 , in an optional embodiment of the application, the third interface module 72 includes a third USB-C interface J3 and a USB-A interface J4, and the third USB-C interface J3 and the USB-A interface J4 are both connected to the other end of the third energy storage inductor L3 and the second fast charging protocol charging chip U4.

[0068] By setting the third USB-C interface J3 and the USB-A interface J4 as the external charging output interface of the third fast charging circuit module 71, a user can select a corresponding charging interface according to the type of a charging cable carried by the user, and the use is convenient. The third USB-C interface J3 and the USB-A interface J4 are both connected to the second fast charging protocol charging chip U4, and the second fast charging protocol charging chip U4 can control protocol communication with a corresponding external electronic device through the third USB-C interface J3 and the USB-A interface J4, and perform corresponding protocol charging.

[0069] It should be understood that the above embodiments are only used to illustrate the technical solutions of the application, rather than limit them. For those skilled in the art, the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents; all these modifications and replacements shall belong to the protection scope of the claims of the application.

Claims

1. An in-vehicle charger characterized by comprising: The vehicle charger comprises a main body, an extended charging base, a power input connector, a wire, a first circuit board and a second circuit board, the power input connector and the second circuit board are arranged on the main body, the first circuit board is arranged in the extended charging base, the first circuit board is provided with a first fast charging circuit module and a first interface module, the second circuit board is provided with a second fast charging circuit module and a second interface module, the second fast charging circuit module is connected with the power input connector and the second interface module to obtain a vehicle power supply voltage and supply power to the outside through the second interface module. The first fast charging circuit module comprises a fast charging protocol control chip, a boost-buck driving chip and a boost-buck circuit unit, the fast charging protocol control chip is connected with the boost-buck driving chip and the first interface module, the control end of the boost-buck circuit unit is connected with the boost-buck driving chip, the voltage input end is connected with the power input connector through the wire to obtain the vehicle power supply voltage, and the voltage output end is connected with the first interface module and supplies power to the outside through the first interface module. The second fast charging circuit module is connected with the fast charging protocol control chip and outputs a first level signal to the fast charging protocol control chip, and the fast charging protocol control chip controls the boost-buck driving chip to output a corresponding PWM signal according to the first level signal.

2. The on-board charger according to claim 1, characterized by The vehicle charger further comprises a third circuit board arranged in the extended charging base, the third circuit board is provided with a third fast charging circuit module and a third interface module, the third fast charging circuit module is connected with the fast charging protocol control chip and the third interface module, supplies power to the outside through the third interface module, and is connected with the power input connector through the wire, the third fast charging circuit module outputs a second level signal to the fast charging protocol control chip, and the fast charging protocol control chip further controls the boost-buck driving chip to output a corresponding PWM signal according to the second level signal.

3. The on-board charger according to claim 1 or 2, characterized in that, The boost-buck circuit unit comprises a first gallium nitride switch tube, a second gallium nitride switch tube, a third gallium nitride switch tube, a fourth gallium nitride switch tube and a first energy storage inductor, the gate of the first gallium nitride switch tube, the gate of the second gallium nitride switch tube, the gate of the third gallium nitride switch tube and the gate of the fourth gallium nitride switch tube are connected with the boost-buck control chip, the source of the first gallium nitride switch tube and the drain of the second gallium nitride switch tube are connected to one end of the first energy storage inductor, the drain of the first gallium nitride switch tube is connected with the power input connector, the source of the second gallium nitride switch tube is grounded, the source of the third gallium nitride switch tube and the drain of the fourth gallium nitride switch tube are connected to the other end of the first energy storage inductor, the drain of the third gallium nitride switch tube is connected with the first interface module, and the source of the fourth gallium nitride switch tube is grounded.

4. The on-board charger according to claim 3, characterized in that, The first interface module comprises a first USB-C interface, and the first USB-C interface is connected with the drain of the third gallium nitride switch tube and the fast charging protocol control chip.

5. The on-vehicle charger according to claim 1 or 2, characterized by, The second fast charging circuit module includes a first fast charging protocol charging chip and a second energy storage inductor, the first fast charging protocol charging chip is connected to one end of the second energy storage inductor and the second interface module, and is connected to the power input connector through the wire, the other end of the second energy storage inductor is connected to the second interface module, and the communication pin of the first fast charging protocol charging chip is connected to the first transmission pin of the fast charging protocol control chip to output a first level signal to the fast charging protocol control chip.

6. The on-board charger of claim 5, wherein, The second fast charging circuit module includes a first configuration resistor, one end of the first configuration resistor is connected to the clock input pin of the first fast charging protocol charging chip, and the other end is grounded.

7. The vehicle-mounted charger according to claim 5, characterized by, The second interface module includes a second USB-C interface, the second USB-C interface is connected to the other end of the second energy storage inductor and the first fast charging protocol charging chip.

8. The vehicle-mounted charger according to claim 2, characterized by, The third fast charging circuit module includes a second fast charging protocol charging chip and a third energy storage inductor, the second fast charging protocol charging chip is connected to the power input connector, one end of the third energy storage inductor and the third interface module, the other end of the third energy storage inductor is connected to the third interface module, the communication pin of the second fast charging protocol charging chip is connected to the second transmission pin of the fast charging protocol control chip to output a second level signal to the fast charging protocol control chip.

9. The vehicle-mounted charger according to claim 8, characterized by, The third fast charging circuit module further includes a second configuration resistor, one end of the second configuration resistor is connected to the clock input pin of the second fast charging protocol charging chip, and the other end is grounded.

10. The vehicle-mounted charger according to claim 8, characterized by, The third interface module includes a third USB-C interface and a USB-A interface, the third USB-C interface and the USB-A interface are both connected to the other end of the third energy storage inductor and the second fast charging protocol charging chip.

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