CN114030373B

CN114030373B - Power supply processing circuit, vehicle-mounted charger and charging gun identification method

Info

Publication number: CN114030373B
Application number: CN202111290770.0A
Authority: CN
Inventors: 罗绍炯
Original assignee: Shenzhen Megmeet Electrical Co Ltd
Current assignee: Shenzhen Megmeet Electrical Co Ltd
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2024-05-14
Anticipated expiration: 2041-11-02
Also published as: CN114030373A

Abstract

The invention relates to the technical field of power supplies, in particular to a power supply processing circuit, a vehicle-mounted charger and a charging gun identification method. The power supply processing circuit includes: the device comprises a first comparison module, a second comparison module, a switch module and a voltage stabilizing output module, wherein the first comparison module is connected with the second comparison module in parallel, the output ends of the first comparison module and the second comparison module are connected with the switch module, the switch module is connected with the voltage stabilizing output module, the first comparison module comprises a first comparator and a first resistor, and the second comparison module comprises a second comparator and a second resistor. According to the power supply processing circuit provided by the embodiment of the invention, the resistance values of the first resistor and the second resistor are preset, and the first comparator and the second comparator are selected as the low-power-consumption comparator, so that the static current of the electric automobile is controlled within the preset range.

Description

Power supply processing circuit, vehicle-mounted charger and charging gun identification method

Technical Field

The invention relates to the technical field of power supplies, in particular to a power supply processing circuit, a vehicle-mounted charger and a charging gun identification method.

Background

In recent years, with rapid development of electric vehicles, vehicle-mounted chargers have been developed. The vehicle-mounted charger is generally powered by a storage battery, and the charger and an internal circuit thereof are equivalent to the load of the storage battery. When the charging machine starts to work, the internal auxiliary power supply of the charging machine should work first and can provide power for the switching machine circuit. Obviously, the smaller the working current of the auxiliary power supply and the switching circuit, namely the smaller the static current of the storage battery, the better, so that the service life of the storage battery can be prolonged as much as possible.

With the increasing demand for static current, for example, current car enterprises do not require more than 0.5 milliamp for static current, and the condition brings certain difficulty to design.

Disclosure of Invention

The embodiment of the invention provides a power supply processing circuit, a vehicle-mounted charger and a charging gun identification method, which can control the static current of an electric automobile in a preset range so as to prolong the service life of a storage battery.

To solve the above technical problem, in a first aspect, an embodiment of the present invention provides a power supply processing circuit, including: the device comprises a first comparison module, a second comparison module, a switch module and a voltage stabilizing output module, wherein the first comparison module is connected with the second comparison module in parallel, the output ends of the first comparison module and the second comparison module are connected with the switch module, and the switch module is connected with the voltage stabilizing output module;

The first comparison module comprises a first comparator (U2A) and a first resistor (R5), the second comparison module comprises a second comparator (U2B) and a second resistor (R6), a first end of the first comparator (U2A) is connected with a seventh end of the second comparator (U2B), a second end of the first comparator (U2A) is connected with a fifth end of the second comparator (U2B), the second end of the first comparator (U2A) is also connected with a first power supply through the first resistor (R5), and a fifth end of the second comparator (U2B) is grounded through the second resistor (R6);

When the electric automobile is in a locked state, the first resistor (R5) and the second resistor (R6) are connected in series, a first power supply is grounded after flowing through the first resistor (R5) and the second resistor (R6), at the moment, the current flowing through the first resistor (R5) and the second resistor (R6) is a first current, and the first current is controlled in a preset range according to the resistance values of the first resistor (R5) and the second resistor (R6);

The first comparator (U2A) and the second comparator (U2B) are low-power comparators.

In some embodiments, the first comparison module further comprises a third resistor (R31) and a fourth resistor (R30),

The third end of the first comparator (U2A) is connected with the second end of the third resistor (R31) and the second end of the fourth resistor (R30), the first end of the third resistor (R31) is connected with a charging gun access signal, the second end of the third resistor (R31) outputs a charging gun connection signal, and the first end of the fourth resistor (R30) is connected with the first power supply.

In some embodiments, the second comparison module further comprises a fifth resistor (R7),

The sixth end of the second comparator (U2B) is connected with an enabling signal through the fifth resistor (R7), the fifth end of the second comparator (U2B) is connected with the second end of the first comparator (U2A) and outputs a low-level integrated signal, and the seventh end of the second comparator (U2B) is connected with the first end of the first comparator (U2A) and outputs a comparison signal to the switch module.

In some embodiments, the switching module includes a first switching tube (Q1), a sixth resistor (R2), and a seventh resistor (R1),

The first end of the first switch tube (Q1) is connected into the comparison signal through the sixth resistor (R2), the second end of the first switch tube (Q1) is connected with the first power supply, two ends of the seventh resistor (R1) are respectively connected with the first end and the second end of the first switch tube (Q1), and the third end of the first switch tube (Q1) outputs a switch signal to the voltage stabilizing output module.

In some embodiments, the power supply processing circuit further comprises a charging gun identification module, a signal processing module and a display module, wherein the input end of the charging gun identification module is connected with the first comparison module and the second comparison module, the output end of the charging gun identification module is connected with the signal processing module,

The charging gun identification module is used for receiving and processing the charging gun connection signal and the low-level integrated signal and outputting a group of level signals to the signal processing module;

the signal processing module is used for receiving the set of level signals and judging the charging state of the electric automobile according to the set of level signals;

The display module is used for displaying the charging state of the electric automobile to a user.

In some embodiments, the charging gun identification module includes a first identification unit, a second identification unit, a third identification unit, and a fourth identification unit,

The input ends of the first identification unit, the second identification unit, the third identification unit and the fourth identification unit are connected with the charging gun connecting signal, and the first level signal, the second level signal, the third level signal and the fourth level signal are respectively output to the signal processing module in response to the charging gun connecting signal.

In some embodiments, the first identifying unit includes a third comparator (U4B), an eighth resistor (R23), a ninth resistor (R26), a tenth resistor (R20), and an eleventh resistor (R21), a fifth end of the third comparator (U4B) is connected to the charging gun connection signal, a sixth end of the third comparator (U4B) is connected to a power supply through the eighth resistor (R23), the sixth end of the third comparator (U4B) is further grounded through the ninth resistor (R26), a seventh end of the third comparator (U4B) is grounded through the tenth resistor (R20), and a seventh end of the third comparator (U4B) is further connected to the power supply through the tenth resistor (R21);

The second identification unit comprises a fourth comparator (U3A), a twelfth resistor (R14), a thirteenth resistor (R18), a fourteenth resistor (R9) and a fifteenth resistor (R13), wherein the fifth end of the fourth comparator (U3A) is connected with the charging gun connection signal, the sixth end of the fourth comparator (U3A) is connected with a power supply through the twelfth resistor (R14), the sixth end of the fourth comparator (U3A) is grounded through the thirteenth resistor (R18), the seventh end of the fourth comparator (U3A) is grounded through the fourteenth resistor (R9), and the seventh end of the fourth comparator (U3A) is also connected with the output of the second level signal through the fifteenth resistor (R13);

The third identifying unit comprises a fifth comparator (U5A), a sixteenth resistor (R24), a seventeenth resistor (R25), an eighteenth resistor (R19) and a nineteenth resistor (R22), wherein the fifth end of the fifth comparator (U5A) is connected with the charging gun connecting signal, the sixth end of the fifth comparator (U5A) is connected with a power supply through the sixteenth resistor (R24), the sixth end of the fifth comparator (U5A) is grounded through the seventeenth resistor (R25), the seventh end of the fifth comparator (U5A) is grounded through the eighteenth resistor (R19), and the seventh end of the fifth comparator (U5A) is also grounded through the nineteenth resistor (R22) to output the third level signal;

The fourth identification unit comprises a sixth comparator (U4A), a twentieth resistor (R16), a twenty-first resistor (R17), a twenty-second resistor (R10) and a twenty-third resistor (R15), wherein a fifth end of the sixth comparator (U4A) is connected with the charging gun connection signal, a sixth end of the sixth comparator (U4A) is connected with a power supply through the twenty-first resistor (R16), a sixth end of the sixth comparator (U4A) is grounded through the twenty-first resistor (R17), a seventh end of the sixth comparator (U4A) is grounded through the twenty-second resistor (R10), and a seventh end of the sixth comparator (U4A) is also grounded through the twenty-third resistor (R15) to output the fourth level signal.

In some embodiments, the charging gun identification module further includes a fifth identification unit for comparing the charging gun connection signal with the low-level integrated signal and outputting a fifth-level signal to identify a connection condition of the charging gun.

In some embodiments, the fifth identification unit includes a seventh comparator (U3B), a twenty-fourth resistor (R11), and a twenty-fifth resistor (R12),

The fifth end of the seventh comparator (U3B) is connected with the second end of the third resistor (R31) to be connected with the charging gun connection signal, the sixth end of the seventh comparator (U3B) is connected with the second end of the first comparator (U2A) to be connected with the low-level integrated signal, the seventh end of the seventh comparator (U3B) is grounded through the twenty-fourth resistor (R11), and the seventh end of the seventh comparator (U3B) also outputs the fifth-level signal through the twenty-fifth resistor (R12).

In a second aspect, an embodiment of the present invention provides a vehicle-mounted charger, including any one of the above power supply processing circuits.

In a third aspect, an embodiment of the present invention provides a method for identifying a charging gun, which is applied to any one of the above power supply processing circuits, and the method includes:

When the charging gun is connected to an electric vehicle, acquiring a charging gun connection signal input by the charging gun;

Processing the charging gun access signal to obtain a group of level signals;

And identifying the model of the charging gun according to the set of level signals.

In some embodiments, the set of level signals includes at least two high level and/or low level signals, and the identifying the model of the charging gun from the set of level signals includes:

and identifying the model of the charging gun according to the at least two high-level signals and/or the low-level signals.

The embodiment of the invention has the beneficial effects that: different from the situation of the prior art, the embodiment of the invention provides a power supply processing circuit, a vehicle-mounted charger and a charging gun identification method, wherein the power supply processing circuit comprises a first comparison module, a second comparison module, a switch module and a voltage stabilizing output module, the first comparison module is connected with the second comparison module in parallel, the output ends of the first comparison module and the second comparison module are connected with the switch module, the switch module is connected with the voltage stabilizing output module, the first comparison module comprises a first comparator and a first resistor, and the second comparison module comprises a second comparator and a second resistor. According to the power supply processing circuit provided by the embodiment of the invention, the resistance values of the first resistor and the second resistor are preset, and the first comparator and the second comparator are selected to be low-power-consumption comparators, so that the static current of the electric automobile is controlled within a preset range. The charging gun identification method is applied to the power supply processing circuit, and the method is used for acquiring a group of level signals by acquiring and comparing charging gun access signals and analyzing the level conditions of the group of level signals to identify the type of the charging gun connected to the electric automobile.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements/modules and steps, and in which the figures do not include the true to scale unless expressly indicated by the contrary reference numerals.

FIG. 1 is a schematic block diagram of a power supply processing circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a power supply processing circuit according to an embodiment of the present invention;

FIG. 3 is a schematic block diagram of another power supply processing circuit according to an embodiment of the present invention;

Fig. 4 is a schematic circuit structure diagram of a charging gun connection module in the charging gun provided in the prior art;

fig. 5 is a schematic block diagram of a charging gun identification module according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a first identification unit according to an embodiment of the present invention;

fig. 7 is a schematic circuit diagram of a second identification unit according to an embodiment of the present invention;

fig. 8 is a schematic circuit diagram of a third identifying unit according to an embodiment of the present invention;

fig. 9 is a schematic circuit diagram of a fourth identification unit according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a table of a signal processing module analyzing a model of a charging gun according to an embodiment of the present invention;

Fig. 11 is a schematic circuit diagram of a fifth identifying unit according to an embodiment of the present invention;

fig. 12 is a flowchart of a charging gun identification method according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It should be noted that, if not in conflict, the features of the embodiments of the present application may be combined with each other, which is within the protection scope of the present application. In addition, while functional block division is performed in a device diagram and logical order is shown in a flowchart, in some cases, the steps shown or described may be performed in a different order than the block division in the device, or in the flowchart. Moreover, the words "first," "second," and the like as used herein do not limit the data and order of execution, but merely distinguish between identical or similar items that have substantially the same function and effect. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

In particular, embodiments of the present invention are further described below with reference to the accompanying drawings.

The quiescent current of an electric vehicle, also called dark current or standby current, refers to the current supplied by a small battery when the vehicle is in a locked state. In short, when the automobile stops working, some electronic devices still work, so that the smaller the static current is, the less the battery is easy to lose power. The scheme of meeting the requirement is better realized when the static current of the early train rabbet is only less than 10 milliamperes, and the requirement of the existing train rabbet on the index is not more than 0.5 milliampere as the requirement on the static current is higher and higher, and the condition brings certain difficulty to design. The embodiment of the invention provides a scheme capable of meeting the condition that the quiescent current of an electric automobile is not more than 0.3 milliamp.

Fig. 1 is a schematic block diagram of a power supply processing circuit according to an embodiment of the invention, please refer to fig. 1. The power supply processing circuit 100 may be provided in an On-Board Charger (OBC) of an electric vehicle, and the power supply processing circuit 100 includes: the device comprises a first comparison module 10, a second comparison module 20, a switch module 30 and a voltage stabilizing output module 10, wherein the first comparison module 10 is connected with the second comparison module 20 in parallel, the output ends of the first comparison module 10 and the second comparison module 20 are connected with the switch module 30, and the switch module 30 is connected with the voltage stabilizing output module 40.

The first comparison module 10 is used for connecting a charging gun, and the second comparison module 20 is used for connecting an enabling signal (VCU_EN_OBC) output by a vehicle controller (VCU, vehicle Control Unit). The first comparing module 10 and the second comparing module 20 control the on-off of the switch module 30 by receiving and comparing the signals of the charging gun and the VCU, so as to control whether the storage battery outputs the first power supply (bat_12v) to the regulated output module 40, and the regulated output module 40 is configured to output the second power supply (5V).

Fig. 2 is a schematic circuit diagram of a power supply processing circuit according to an embodiment of the invention, please refer to fig. 2. In the embodiment shown in fig. 2, the first comparing module 10 includes a first comparator (U2A) and a first resistor (R5), the second comparing module 20 includes a second comparator (U2B) and a second resistor (R6), a first end of the first comparator (U2A) is connected to a seventh end of the second comparator (U2B), a second end of the first comparator (U2A) is connected to a fifth end of the second comparator (U2B), the second end of the first comparator (U2A) is further connected to a first power supply (bat_12v) through the first resistor (R5), and the fifth end of the second comparator (U2B) is grounded through the second resistor (R6). When the electric automobile is in a locking state, the first resistor (R5) and the second resistor (R6) are connected in series, the first power supply (bat_12V) is grounded after passing through the first resistor (R5) and the second resistor (R6), at the moment, the current passing through the first resistor (R5) and the second resistor (R6) is first current, and the first current is controlled in a preset range according to the resistance values of the first resistor (R5) and the second resistor (R6). The first comparator (U2A) and the second comparator (U2B) are low power comparators.

The power supply current of the first comparator (U2A) and the power supply current of the second comparator (U2B) are added, and the added first current is the static current of the embodiment of the invention.

When the electric automobile is in a locked state and is not charged, the third end of the first comparator (U2A) inputs a first power supply (Bat_12V) as a high level signal, the second end of the first comparator (U2A) inputs the first power supply (Bat_12V) through a first resistor (R5) and a second resistor (R6), the first resistor (R5) and the second resistor (R6) divide voltage, and therefore the voltage of the third end of the first comparator (U2A) is higher than the voltage of the second end of the first comparator (U2A), and the first end of the first comparator (U2A) outputs the high level signal. The sixth terminal of the second comparator (U2B) is connected to the enable signal (vcu_en_obc) output by the VCU, the enable signal (vcu_en_obc) output by the VCU is a low level signal, and the fifth terminal of the second comparator (U2B) inputs the first power supply (bat_12v) as a high level signal, so the voltage of the fifth terminal of the second comparator (U2B) is higher than the voltage of the sixth terminal thereof, and the seventh terminal of the second comparator (U2B) outputs the high level signal. Since the first terminal of the first comparator (U2A) outputs a high-level signal to the switching module 30 and the seventh terminal of the second comparator (U2B) outputs a high-level signal to the switching module 30, the first terminal and the second terminal of the switching module 30 are equal in voltage, so that the switching module 30 is turned off, so that the battery cuts off the power supply to the regulated output module 40. The current consuming device includes a first resistor (R5), a second resistor (R6), a first comparator (U2A), and a second comparator (U2B). The resistance values of the first resistor (R5) and the second resistor (R6) are preset, and the first comparator (U2A) and the second comparator (U2B) are selected to be low-power-consumption comparators, so that the static current is controlled within a preset range.

For example, the first comparator (U2A) and the second comparator (U2B) are selected to be comparators of model TS393IYDT, which have a supply current of at most 25 microamps, i.e., 0.025 milliamps. The resistance value of the first resistor (R5) is 33 kiloohms, the resistance value of the second resistor (R6) is 22 kiloohms, the sum of the resistance values of the first resistor (R5) and the second resistor (R6) is 55 kiloohms, the current flowing through the first resistor (R5) and the second resistor (R6) is 12V divided by 55 kiloohms and is equal to 0.22 milliamp, the total consumption current is 0.025 milliamp plus 0.22 milliamp and is equal to 0.245 milliamp, namely the static current is 0.245 milliamp, and the static current does not exceed 0.3 milliamp.

According to the power supply processing circuit provided by the embodiment of the invention, the resistance values of the first resistor (R5) and the second resistor (R6) are preset, and the first comparator (U2A) and the second comparator (U2B) are selected to be low-power-consumption comparators, so that the quiescent current is controlled within a preset range.

With continued reference to fig. 2, in some embodiments, the first comparing module 10 further includes a third resistor (R31) and a fourth resistor (R30), the third end of the first comparator (U2A) is connected to the second end of the third resistor (R31) and the second end of the fourth resistor (R30), the first end of the third resistor (R31) is connected to the charging gun access signal (CC), the second end of the third resistor (R31) outputs the charging gun connection signal (cc_det), and the first end of the fourth resistor (R30) is connected to the first power source (bat_12v). In the embodiment of the invention, the third resistor (R31) is used for connecting the charging gun, and if the charging gun is not connected to the electric automobile, the third resistor (R31) does not work. If the sum of the resistance values of the first resistor (R5) and the second resistor (R6) is 55 kiloohms, and the resistance value of the fourth resistor (R30) is 6.8 kiloohms, the voltage of the third end of the first comparator (U2A) is higher than the voltage of the second end of the first comparator (U2A), so that the first comparator (U2A) outputs a high-level signal. If the charging gun is connected to the first comparing module 10 and the third resistor (R31), the voltage of the third end of the first comparator (U2A) is equal to the voltage of the second end thereof, so that the first comparator (U2A) outputs a low level signal.

In some embodiments, the second comparing module 20 further includes a fifth resistor (R7), the sixth end of the second comparator (U2B) is connected to the enable signal through the fifth resistor (R7), the fifth end of the second comparator (U2B) is connected to the second end of the first comparator (U2A) and outputs the Low-level integrated signal (low_comp), and the seventh end of the second comparator (U2B) is connected to the first end of the first comparator (U2A) and outputs the comparison signal to the switching module. The comparison signal is a signal commonly output by the first comparator (U2A) and the second comparator (U2B). The fifth resistor (R7) is used for dividing the inputted enable signal to enable the second comparator (U2B) to output a high level signal.

In some embodiments, the switching module includes a first switching tube (Q1), a sixth resistor (R2) and a seventh resistor (R1), a first end of the first switching tube (Q1) is connected to the comparison signal through the sixth resistor (R2), a second end of the first switching tube (Q1) is connected to the first power supply, two ends of the seventh resistor (R1) are respectively connected to the first end and the second end of the first switching tube (Q1), and a third end of the first switching tube (Q1) outputs the switching signal to the regulated output module. The first switching tube (Q1) can be a field effect tube, the resistance value of the sixth resistor (R2) can be 2 kiloohms, and the resistance value of the seventh resistor (R1) can be 51 kiloohms. So that the first switching tube (Q1) is turned off when the first end of the first switching tube (Q1) is a high level signal, and the first switching tube (Q1) is turned on when the first end of the first switching tube (Q1) is a high level signal, and the first switching tube (Q1) is used for controlling the on-off of the first power supply (Bat_12V) to the voltage stabilizing output module 40 so as to control the power supply of the storage battery.

In summary, the power supply processing circuit includes a first comparing module 10, a second comparing module 20, a switching module 30 and a voltage stabilizing output module 40, the first comparing module 10 is connected in parallel with the second comparing module 20, the output ends of the first comparing module 10 and the second comparing module 20 are connected with the switching module 20, the switching module 20 is connected with the voltage stabilizing output module 40, the first comparing module 10 includes a first comparator (U2A) and a first resistor (R5), and the second comparing module 20 includes a second comparator (U2B) and a second resistor (R6). According to the power supply processing circuit provided by the embodiment of the invention, the resistance values of the first resistor (R5) and the second resistor (R6) are preset, and the first comparator (U2A) and the second comparator (U2B) are selected to be low-power-consumption comparators, so that the static current of the electric automobile is controlled within 0.3 milliampere.

At present, the charging gun for charging the new energy electric automobile has four types of 10A, 16A, 32A and 63A, a vehicle-mounted charger on the new energy electric automobile is required to identify the type of the charging gun and output matched power to ensure that the input required current of the charger is smaller than the maximum current bearable by the charging gun, thereby ensuring safety and avoiding ignition and combustion accidents. The embodiment of the invention provides another power supply processing circuit which can not only control the static current in a preset range, but also identify the model of the charging gun.

Fig. 3 is a schematic block diagram of another power supply processing circuit according to an embodiment of the invention, please refer to fig. 3. The power supply processing circuit 100 further includes a charging gun identification module 50, a signal processing module 60 and a display module 70, wherein an input end of the charging gun identification module 50 is connected with the first comparison module 10 and the second comparison module 20, an output end of the charging gun identification module 50 is connected with the signal processing module 60, and the charging gun identification module 50 is used for receiving and processing a charging gun connection signal (cc_det) and a Low-level integrated signal (low_comp) and outputting a group of level signals to the signal processing module 60; the signal processing module 60 is configured to receive a set of level signals, and determine a charging state of the electric vehicle according to the set of level signals; the display module 70 is used for displaying the charging state of the electric automobile to a user.

When the electric automobile locks and is connected with the charging gun, the comparison signals output by the first comparison module 10 and the second comparison module 20 are low-level signals, so that the switch module 30 is a passage, and the storage battery supplies power to the voltage-stabilizing output module 40, so that the voltage-stabilizing output module 40 supplies power to the charging gun identification module 50, the signal processing module 60 and the display module 70.

Fig. 4 is a schematic circuit diagram of a charging gun connection module in a charging gun according to the prior art, please refer to fig. 4. The charging gun connection module 80 is arranged in a charging gun, the charging gun connection module comprises a first charging gun Resistor (RC), a second charging gun resistor (R4) and a charging gun connection switch (S3), a first comparison module 10 is connected to a first end of the first charging gun Resistor (RC) and used for outputting a charging gun access signal (CC), a second end of the first charging gun Resistor (RC) is connected with a first end of the second charging gun resistor (R4) and a first end of the first switch (S3), and a second end of the second charging gun resistor (R4) is connected with a second end of the charging gun connection switch (S3) and grounded. When the charging gun is connected with an electric car, the charging gun connecting switch (S3) is closed, otherwise, the charging gun connecting switch (S3) is opened. Different types of charging guns have different resistance values of the corresponding first charging gun Resistor (RC) and the corresponding second charging gun resistor (R4). The charging gun access signal (CC) is divided by a third resistor (R31), and the third resistor (R31) outputs a charging gun connection signal (CC_det).

Specifically, the resistance of the first charging gun Resistor (RC) of the charging gun of 10A was 1.5 kiloohms, and the resistance of the second charging gun resistor (R4) of the charging gun of 10A was 1.8 kiloohms. The resistance of the first gun Resistor (RC) of the 16A gun was 680 ohms and the resistance of the second gun resistor (R4) of the 16A gun was 2.7 kiloohms. The resistance of the first gun Resistor (RC) of the gun of 32A was 220 ohms and the resistance of the second gun resistor (R4) of the gun of 32A was 3.3 kiloohms. The resistance of the first gun Resistor (RC) of the gun for charging 63A was 100 ohms, and the resistance of the second gun resistor (R4) of the gun for charging 63A was 3.3 kiloohms.

The power supply processing circuit of the embodiment of the invention identifies the type of the charging gun according to the difference of the resistance values of the first charging gun Resistor (RC) and the second charging gun resistor (R4) corresponding to the charging guns with different types.

Fig. 5 is a schematic block diagram of a charging gun identification module according to an embodiment of the invention, please refer to fig. 5. The charging gun recognition module 50 provided by the embodiment of the invention includes a first recognition unit 501, a second recognition unit 502, a third recognition unit 503 and a fourth recognition unit 504, wherein input ends of the first recognition unit 501, the second recognition unit 502, the third recognition unit 503 and the fourth recognition unit 504 are connected with a charging gun connection signal (cc_det), and the charging gun connection signal (cc_det) is responded to respectively output a first level signal (MCU 1), a second level signal (MCU 2), a third level signal (MCU 3) and a fourth level signal (MCU 4) to the signal processing module 60.

Specifically, the first recognition unit 501 is provided for recognizing the charging gun of 10A, the second recognition unit 502 is provided for recognizing the charging gun of 16A, the third recognition unit 503 is provided for recognizing the charging gun of 32A, and the fourth recognition unit 504 is provided for recognizing the charging gun of 63A.

In the embodiment of the invention, a charging gun identification module for four charging guns, namely, 10A, 16A, 32A and 63A, is schematically shown, and comprises a first identification unit, a second identification unit, a third identification unit and a fourth identification unit. On the basis, the number of the identification units of the charging gun identification module can be increased or decreased according to actual requirements. For example, if the user only needs to identify the charging gun of 10A, the charging gun identification module may set only the first identification unit. If the user only needs to identify the charging guns of 16A and 32A, the charging gun identification module may only provide the second identification unit and the third identification unit. If a new charging gun, such as 120A charging gun, is available on the market, we need to identify five types of charging guns, i.e. 10A, 16A, 32A, 63A, 120A charging guns, then a sixth identification unit can be set based on the resistance value of the first charging gun Resistor (RC) and the resistance value of the second charging gun resistor (R4) of the 120A charging gun on the original basis to identify the 120A charging gun.

Fig. 6 is a schematic circuit diagram of a first recognition unit according to an embodiment of the present invention, fig. 7 is a schematic circuit diagram of a second recognition unit according to an embodiment of the present invention, fig. 8 is a schematic circuit diagram of a third recognition unit according to an embodiment of the present invention, and fig. 9 is a schematic circuit diagram of a fourth recognition unit according to an embodiment of the present invention, please refer to fig. 6, fig. 7, fig. 8 and fig. 9.

The first identifying unit 501 includes a third comparator (U4B), an eighth resistor (R23), a ninth resistor (R26), a tenth resistor (R20), and an eleventh resistor (R21), a fifth end of the third comparator (U4B) is connected to the charging gun connection signal (cc_det), a sixth end of the third comparator (U4B) is connected to a power supply through the eighth resistor (R23), a sixth end of the third comparator (U4B) is further grounded through the ninth resistor (R26), a seventh end of the third comparator (U4B) is grounded through the tenth resistor (R20), and a seventh end of the third comparator (U4B) is further connected to the output of the first level signal (MCU 1) through the tenth resistor (R21).

The second identifying unit 502 includes a fourth comparator (U3A), a twelfth resistor (R14), a thirteenth resistor (R18), a fourteenth resistor (R9) and a fifteenth resistor (R13), the fifth end of the fourth comparator (U3A) is connected to the charging gun connection signal (cc_det), the sixth end of the fourth comparator (U3A) is connected to the power supply through the twelfth resistor (R14), the sixth end of the fourth comparator (U3A) is further grounded through the thirteenth resistor (R18), the seventh end of the fourth comparator (U3A) is grounded through the fourteenth resistor (R9), and the seventh end of the fourth comparator (U3A) is further connected to the output of the second level signal (MCU 2) through the fifteenth resistor (R13).

The third identifying unit 503 includes a fifth comparator (U5A), a sixteenth resistor (R24), a seventeenth resistor (R25), an eighteenth resistor (R19), and a nineteenth resistor (R22), the fifth end of the fifth comparator (U5A) is connected to the charging gun connection signal (cc_det), the sixth end of the fifth comparator (U5A) is connected to the power supply through the sixteenth resistor (R24), the sixth end of the fifth comparator (U5A) is further grounded through the seventeenth resistor (R25), the seventh end of the fifth comparator (U5A) is grounded through the eighteenth resistor (R19), and the seventh end of the fifth comparator (U5A) is further connected to the output of the third level signal (MCU 3) through the nineteenth resistor (R22).

The fourth identifying unit 504 includes a sixth comparator (U4A), a twentieth resistor (R16), a twenty-first resistor (R17), a twenty-second resistor (R10), and a twenty-third resistor (R15), a fifth end of the sixth comparator (U4A) is connected to the charging gun connection signal (cc_det), a sixth end of the sixth comparator (U4A) is connected to the power supply through the twenty-first resistor (R16), a sixth end of the sixth comparator (U4A) is further grounded through the twenty-first resistor (R17), a seventh end of the sixth comparator (U4A) is further grounded through the twenty-second resistor (R10), and a seventh end of the sixth comparator (U4A) is further connected to the output of the fourth level signal (MCU 4) through the twenty-third resistor (R15).

Specifically, the resistance of the eighth resistor (R23) may be set to 20 kilo-ohms, and the resistance of the ninth resistor (R26) may be set to 6.2 kilo-ohms. The resistance of the twelfth resistor (R14) may be set to 20 kilo-ohms, and the resistance of the thirteenth resistor (R18) may be set to 3.6 kilo-ohms. The sixteenth resistor (R24) may have a resistance of 20 kilo-ohms and the seventeenth resistor (R25) may have a resistance of 1.8 kilo-ohms. The resistance value of the twentieth resistor (R16) may be set to 1.1 kilo-ohms, and the resistance value of the twenty-first resistor (R17) may be set to 1.1 kilo-ohms.

When the charging gun of 10A is connected to an electric vehicle, the charging gun connection signal (CC_det) is divided by the fourth resistor (R30) and the third resistor (R31), the first charging gun Resistor (RC) and the charging gun connection switch (S3) to obtain the voltage of the fifth end of the third comparator (U4B), the voltage of the sixth end of the third comparator (U4B) is divided by the eighth resistor (R23) and the ninth resistor (R26), the voltage of the sixth end of the third comparator (U4B) is higher than the voltage of the fifth end of the third comparator, and the first level signal (MCU 1) output by the seventh end of the third comparator (U4B) is a low level signal. At this time, the voltages at the second ends of the fourth comparator (U3A), the fifth comparator (U5A) and the sixth comparator (U4A) are all higher than the voltage at the third end, and the outputs at the first ends are all high level signals.

When the charging gun of 16A is connected to an electric vehicle, the charging gun connection signal (CC_det) is divided by the fourth resistor (R30) and the third resistor (R31), the first charging gun Resistor (RC) and the charging gun connection switch (S3) to obtain the voltage of the third end of the fourth comparator (U3A), the voltage of the second end of the fourth comparator (U3A) is divided by the twelfth resistor (R14) and the thirteenth resistor (R18), the voltage of the second end of the fourth comparator (U3A) is higher than the voltage of the third end, and the second level signal (MCU 2) output by the first end of the fourth comparator (U3A) is a low level signal. At this time, the voltage at the sixth end of the third comparator (U4B) is higher than the voltage at the fifth end thereof, and the second level signal (MCU 2) output from the seventh end of the third comparator (U4B) is a low level signal. The voltages of the second ends of the fifth comparator (U5A) and the sixth comparator (U4A) are higher than the voltage of the third end, and the outputs of the first ends are high level signals.

When the charging gun of 32A is connected to an electric vehicle, the charging gun connection signal (CC_det) is divided by a resistor fourth resistor (R30) and a resistor third resistor (R31), a first charging gun Resistor (RC) and a charging gun connection switch (S3) to obtain the voltage of the third end of a fifth comparator (U5A), the voltage of the second end of the fifth comparator (U5A) is divided by a sixteenth resistor (R24) and a seventeenth resistor (R25), the voltage of the second end of the fifth comparator (U5A) is higher than the voltage of the third end, and a third level signal (MCU 3) output by the first end of the fifth comparator (U5A) is a low level signal. At this time, the voltage at the sixth end of the third comparator (U4B) is higher than the voltage at the fifth end thereof, and the second level signal (MCU 2) output from the seventh end of the third comparator (U4B) is a low level signal. The voltage of the second end of the fourth comparator (U3A) is higher than that of the third end, and the second level signal (MCU 2) output by the first end of the fourth comparator (U3A) is a low level signal. The voltage of the second end of the sixth comparator (U4A) is higher than the voltage of the third end, and the fourth level signal (MCU 4) output by the first end is a high level signal.

When the charging gun of 63A is connected to an electric vehicle, the charging gun connection signal (CC_det) is divided by the resistor fourth resistor (R30) and the resistor third resistor (R31), the first charging gun Resistor (RC) and the charging gun connection switch (S3) to obtain the voltage of the third end of the sixth comparator (U4A), the voltage of the second end of the sixth comparator (U4A) is divided by the twenty-first resistor (R16) and the twenty-first resistor (R17), the voltage of the second end of the sixth comparator (U4A) is higher than the voltage of the third end of the sixth comparator, and the fourth level signal (MCU 4) output by the first end of the sixth comparator (U4A) is a low level signal.

The first level signal (MCU 1), the second level signal (MCU 2), the third level signal (MCU 3) and the fourth level signal (MCU 4) are input to the signal processing module 60, and the signal processing module 60 identifies the type of the charging gun by analyzing the high and low level conditions of the level signals. Specifically, the following is described.

Fig. 10 is a table schematic diagram of a signal processing module for analyzing a model of a charging gun according to an embodiment of the invention, please refer to fig. 10. As shown, the high signal is denoted as 1 and the low signal is denoted as 0.

If the first level signal (MCU 1) is a low level signal, the second level signal (MCU 2), the third level signal (MCU 3) and the fourth level signal (MCU 4) are all high level signals, namely, the type of the electric automobile connection charging gun is judged to be the first type, namely, the charging gun of 10A. That is, when the signal processing module 60 detects that the set of level signals of "MCU1-MCU2-MCU3-MCU4" is "0-1-1-1", it is determined that the charging gun connected at this time is the charging gun of 10A.

If the first level signal (MCU 1) and the second level signal (MCU 2) are both low level signals and the third level signal (MCU 3) and the fourth level signal (MCU 4) are both high level signals, the model of the electric automobile connection charging gun is judged to be the second model, namely the 16A charging gun. That is, when the signal processing module 60 detects that the set of level signals of "MCU1-MCU2-MCU3-MCU4" is "0-0-1-1", it is determined that the charging gun connected at this time is the charging gun of 16A.

If the first level signal (MCU 1), the second level signal (MCU 2) and the third level signal (MCU 3) are all low level signals and the fourth level signal (MCU 4) is high level signal, the type of the electric automobile connection charging gun is judged to be the third type, namely the charging gun of 32A. That is, when the signal processing module 60 detects that the set of level signals of "MCU1-MCU2-MCU3-MCU4" is "0-0-0-1", it is determined that the charging gun connected at this time is a charging gun of 32A.

If the first level signal (MCU 1), the second level signal (MCU 2), the third level signal (MCU 3) and the fourth level signal (MCU 4) are all low level signals, the model of the electric automobile connection charging gun is judged to be the fourth model, namely the charging gun of 63A. That is, when the signal processing module 60 detects that the set of level signals of "MCU1-MCU2-MCU3-MCU4" is "0-0-0", it is determined that the charging gun connected at this time is the charging gun of 63A.

The signal processing module 60 provided in the embodiment of the present invention may be a chip or other devices, and is configured to receive and analyze a set of level signals output by the charging gun identification module 50 and output the analyzed result. For example, it may be a single-chip microcomputer, a digital processor (DIGITAL SIGNAL Processing, DSP), a programmable logic controller (Programmable Logic Controller, PLC), or the like.

According to the power supply processing circuit 100 provided by the embodiment of the invention, the resistance values of the first resistor (R5) and the second resistor (R6) are preset, and the first comparator (U2A) and the second comparator (U2B) are selected to be low-power-consumption comparators, so that the static current of the electric automobile is controlled within a preset range. The input end of the charging gun identification module 50 of the power supply processing circuit 100 is connected with the first comparison module 10 and the second comparison module 20, the output end of the charging gun identification module 50 is connected with the signal processing module 60, the charging gun identification module 50 is used for receiving and processing a charging gun connection signal (CC_det) and a Low-level integrated signal (Low_Comp), outputting a group of level signals to the signal processing module 60, and the signal processing module 60 is used for receiving a group of level signals and judging the charging state of the electric automobile according to the group of level signals; the display module 70 is used for displaying the charging state of the electric automobile to a user. In general, the power supply processing circuit 100 provided in the embodiment of the present invention can not only control the quiescent current within a preset range, but also identify the model of the charging gun when the charging gun is connected to the electric vehicle.

In some embodiments, the charging gun identification module further includes a fifth identification unit for comparing the charging gun connection signal with the low-level integrated signal and outputting a fifth-level signal (MCU 5) to identify the connection condition of the charging gun.

Fig. 11 is a schematic circuit diagram of a fifth identifying unit according to an embodiment of the invention, please refer to fig. 11. As shown in fig. 11, the fifth identifying unit includes a seventh comparator (U3B), a twenty-fourth resistor (R11) and a twenty-fifth resistor (R12), a fifth end of the seventh comparator (U3B) is connected to a second end of the third resistor (R31) to access the charging gun connection signal, a sixth end of the seventh comparator (U3B) is connected to a second end of the first comparator (U2A) to access the low-level integrated signal, a seventh end of the seventh comparator (U3B) is grounded through the twenty-fourth resistor (R11), and a seventh end of the seventh comparator (U3B) is further connected to the ground through the twenty-fifth resistor (R12) to output the fifth-level signal.

Specifically, when the charging gun is not connected to the electric vehicle, the VCU wakes up the OBC, the VCU output enable signal (vcu_en_obc) is a high level signal, the voltage of the sixth section of the second comparator (U2B) is divided by the fifth resistor (R7) and the twenty-sixth resistor (R8), the fifth end of the second comparator (U2B) is divided by the first resistor (R5) and the second resistor (R6) and outputs a Low level integrated signal (low_comp), the voltage of the sixth end of the second comparator (U2B) is higher than the voltage of the fifth end thereof, and the level signal output by the seventh end of the second comparator (U2B) is a Low level signal. Because the charging gun is not connected, the port of the charging gun access signal (CC) is in a suspended state, namely the charging gun connection signal (CC_det) is a first power supply (Bat_12V) of the storage battery, the second end of the first comparator (U2A) is connected with a Low-level integrated signal (Low_Comp), the voltage of the third end of the first comparator (U2A) is higher than that of the second end of the first comparator, the level signal output by the first end of the first comparator (U2A) is a high-level signal, and the level signal output by the seventh end of the second comparator (U2B) is a Low-level signal. A low-level signal is input to a first end of the first switching tube (Q1), and the first switching tube (Q1) is turned on. The voltage of the fifth end of the seventh comparator (U3B) and the voltage of the fifth end of the third comparator (U4B) are higher than the voltage of the sixth end, the signals output by the seventh end of the seventh comparator (U3B) and the seventh end of the third comparator (U4B) are high-level signals, and the signals output by the fourth comparator (U3A), the fifth comparator (U5A) and the sixth comparator (U4A) are high-level signals.

When the charging gun is half-connected to the electric vehicle, that is, the charging gun is connected to the electric vehicle but the charging gun connection switch (S3) is in an off state, the charging gun connection signal (CC_det) is divided by the fourth resistor (R30) and the third resistor (R31), the first charging gun Resistor (RC) and the second charging gun resistor (R4) to obtain the voltage of the fifth end of the seventh comparator (U3B), the Low-level integrated signal (Low_Comp) is divided by the first resistor (R5) and the second resistor (R6) to obtain the voltage of the sixth end of the seventh comparator (U3B), the voltage of the sixth end of the seventh comparator (U3B) is higher than the voltage of the fifth end of the seventh comparator (U3B), and the fifth-level signal (MCU 5) output by the seventh end of the seventh comparator (U3B) is a Low-level signal. The output level signals of the third comparator (U4B), the fourth comparator (U3A), the fifth comparator (U5A) and the sixth comparator (U4A) are all high level signals.

Referring to fig. 10, as shown in fig. 10, if the first level signal (MCU 1) is a low level signal, the second level signal (MCU 2), the third level signal (MCU 3), the fourth level signal (MCU 4) and the fifth level signal (MCU 5) are all high level signals, it is determined that the electric vehicle is not connected to the charging gun. That is, when the signal processing module 60 detects that the set of level signals of "MCU1-MCU2-MCU3-MCU4-MCU5" is "1-1-1-1", it is determined that the charging gun is not connected at this time.

If the first level signal (MCU 1) is a low level signal, the second level signal (MCU 2), the third level signal (MCU 3) and the fourth level signal (MCU 4) are all high level signals, and the fifth level signal (MCU 5) is a low level signal, the electric automobile semi-connection charging gun is judged. That is, when the signal processing module 60 detects that the set of level signals of "MCU1-MCU2-MCU3-MCU4-MCU5" is "1-1-1-0", it is determined that the electric vehicle is semi-connected to the charging gun at this time, and the situation is displayed to the user through the display module 70.

In the first aspect of the power supply processing circuit 100 provided by the embodiment of the invention, the resistance values of the first resistor (R5) and the second resistor (R6) are preset, and the first comparator (U2A) and the second comparator (U2B) are selected to be low-power-consumption comparators, so that the static current of the electric automobile is controlled within a preset range. In a second aspect, an input end of a charging gun identification module 50 of the power supply processing circuit 100 is connected to the first comparison module 10 and the second comparison module 20, an output end of the charging gun identification module 50 is connected to the signal processing module 60, the charging gun identification module 50 is configured to receive and process a charging gun connection signal (cc_det) and a Low-level integrated signal (low_comp), output a set of level signals to the signal processing module 60, and the signal processing module 60 is configured to receive the set of level signals and determine a charging state of the electric vehicle according to the set of level signals; the display module 70 is used for displaying the charging state of the electric automobile to a user. In general, the power supply processing circuit 100 provided in the embodiment of the present invention can not only control the quiescent current within a preset range, but also identify the model of the charging gun and the connection state of the charging gun when the charging gun is connected to the electric vehicle.

As still another aspect of the embodiment of the present invention, the embodiment of the present invention provides a charging gun identification method. The function of the charging gun identification method according to the embodiment of the present invention may be performed by a hardware platform in addition to the above-described power processing circuit of fig. 3. For example: the charging gun identification method may be performed in an electronic device of a suitable type having a processor with arithmetic capabilities, for example: a single chip microcomputer, a digital processor (DIGITAL SIGNAL Processing, DSP), a programmable logic controller (Programmable Logic Controller, PLC), etc.

The functions corresponding to the charging gun identification methods of the embodiments described below are stored in the memory of the electronic device in the form of instructions, and when the functions corresponding to the charging gun identification methods of the embodiments described below are to be executed, the processor of the electronic device accesses the memory to retrieve and execute the corresponding instructions to implement the functions corresponding to the charging gun identification methods of the embodiments described below.

The memory, which is a non-volatile computer-readable storage medium, may be used to store a non-volatile software program, a non-volatile computer-executable program, and modules, such as program instructions/modules corresponding to the power supply processing circuit 100 in the above-described embodiments, or steps corresponding to the charging gun identification method in the below-described embodiments. The processor executes various functional applications and data processing of the power processing circuit 100 by running nonvolatile software programs, instructions and modules stored in the memory, that is, functions of the various modules and units of the power processing circuit 100 of the above-described embodiment, or functions of steps corresponding to the charging gun identification method of the below-described embodiment.

The memory may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory may optionally include memory located remotely from the processor, the remote memory being connectable to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

Program instructions/modules are stored in the memory that, when executed by the one or more processors, perform the charge gun identification method in any of the method embodiments described below.

Fig. 12 is a flowchart of a charging gun identification method according to an embodiment of the invention, please refer to fig. 12.

The method for identifying the charging gun provided by the embodiment of the invention is applied to the power supply processing circuit 100, and comprises the following steps:

S11, when the charging gun is connected to the electric vehicle, a charging gun connection signal input by the charging gun is obtained.

S12, processing the charging gun access signal to obtain a group of level signals.

S13, identifying the type of the charging gun according to a group of level signals.

In some embodiments, the set of level signals includes at least two high level and/or low level signals, and identifying the model of the charging gun based on the set of level signals includes: the model of the charging gun is identified based on at least two high and/or low level signals.

Since the circuit embodiments and the method embodiments are based on the same concept, the contents of the method embodiments may refer to the circuit embodiments on the premise that the contents do not conflict with each other, which is not described herein. According to the charging gun identification method provided by the embodiment of the invention, the charging gun access signals are acquired and compared to acquire a group of level signals, and the level conditions of the group of level signals are analyzed to identify the type of the charging gun.

The embodiment of the invention also provides a vehicle-mounted charger, which comprises the power supply processing circuit of any embodiment. Since the apparatus embodiment and the circuit embodiment are based on the same concept, the content of the apparatus embodiment may refer to the circuit embodiment on the premise that the content does not conflict with each other, which is not described herein. According to the vehicle-mounted charger provided by the embodiment of the invention, in the first aspect, the resistance values of the first resistor and the second resistor are preset, and the first comparator and the second comparator are selected as the low-power-consumption comparator, so that the static current of the electric automobile is controlled within the preset range. In the second aspect, a set of level signals is obtained by acquiring and comparing charging gun access signals, and the level of the set of level signals is analyzed to identify the type of the charging gun and the connection state of the charging gun.

It should be noted that the above-described apparatus embodiments are merely illustrative, and that the units described as separate units may or may not be physically separate, and that units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the application as above, which are not provided in details for the sake of brevity; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims

1. A power supply processing circuit, comprising: the device comprises a first comparison module, a second comparison module, a switch module and a voltage stabilizing output module, wherein the first comparison module is connected with the second comparison module in parallel, the output ends of the first comparison module and the second comparison module are connected with the switch module, and the switch module is connected with the voltage stabilizing output module;

The first comparator (U2A) and the second comparator (U2B) are low-power-consumption comparators;

The first comparison module further comprises a third resistor (R31) and a fourth resistor (R30), a third end of the first comparator (U2A) is connected with a second end of the third resistor (R31) and a second end of the fourth resistor (R30), a first end of the third resistor (R31) is connected with a charging gun access signal, a second end of the third resistor (R31) outputs a charging gun connection signal, and a first end of the fourth resistor (R30) is connected with the first power supply;

the second comparison module further comprises a fifth resistor (R7), a sixth end of the second comparator (U2B) is connected with an enabling signal through the fifth resistor (R7), a fifth end of the second comparator (U2B) is connected with a second end of the first comparator (U2A) and outputs a low-level integrated signal, and a seventh end of the second comparator (U2B) is connected with a first end of the first comparator (U2A) and outputs a comparison signal to the switch module;

Wherein the power supply processing circuit further comprises: the charging gun comprises a charging gun identification module, a signal processing module and a display module; the input end of the charging gun identification module is connected with the first comparison module and the second comparison module, and the output end of the charging gun identification module is connected with the signal processing module; the charging gun identification module is used for receiving and processing the charging gun connection signal and the low-level integrated signal and outputting a group of level signals to the signal processing module; the signal processing module is used for receiving the set of level signals and judging the charging state of the electric automobile according to the set of level signals; the display module is used for displaying the charging state of the electric automobile to a user;

the power supply processing circuit is used for executing the following method, comprising the following steps: when the charging gun is connected to the electric vehicle, acquiring a charging gun connection signal input by the charging gun; processing the charging gun access signal to obtain a group of level signals; and identifying the model of the charging gun according to the set of level signals.

2. The circuit according to claim 1, wherein the switching module comprises a first switching tube (Q1), a sixth resistor (R2) and a seventh resistor (R1),

3. The circuit of claim 2, wherein the charging gun identification module comprises a first identification unit, a second identification unit, a third identification unit, and a fourth identification unit,

4. The circuit of claim 3, wherein the circuit comprises a plurality of transistors,

The first identification unit comprises a third comparator (U4B), an eighth resistor (R23), a ninth resistor (R26), a tenth resistor (R20) and an eleventh resistor (R21), wherein the fifth end of the third comparator (U4B) is connected with the charging gun connection signal, the sixth end of the third comparator (U4B) is connected with a power supply through the eighth resistor (R23), the sixth end of the third comparator (U4B) is grounded through the ninth resistor (R26), the seventh end of the third comparator (U4B) is grounded through the tenth resistor (R20), and the seventh end of the third comparator (U4B) is also connected with the first level signal through the eleventh resistor (R21);

5. The circuit of claim 4, wherein the charging gun identification module further comprises a fifth identification unit for comparing the charging gun connection signal with the low-level integrated signal and outputting a fifth-level signal to identify the connection condition of the charging gun.

6. The circuit of claim 5, wherein the fifth identification unit comprises a seventh comparator (U3B), a twenty-fourth resistor (R11) and a twenty-fifth resistor (R12),

7. A vehicle-mounted charger comprising the power supply processing circuit of any one of claims 1-6.

8. A method of identifying a charging gun for use in the power processing circuit of any one of claims 1-6, the method comprising:

Processing the charging gun access signal to obtain a group of level signals;

9. The method of claim 8, wherein the set of level signals includes at least two high level and/or low level signals, and wherein identifying the model of the charging gun from the set of level signals includes: