Charging circuit, charging connection device, short circuit detection method, device and system

Abstract

The invention discloses a charging circuit, a charging connection device, a short circuit detection method, a short circuit detection device, a short circuit detection system and a computer readable storage medium. The charging circuit is used for accessing a charging power supply to charge a load. The charging circuit comprises a power input end, a power output end, an output switch module and a short circuit detection module. The power input end is connected with a charging power supply. The power output end is connected with a load. The output switch module is connected between the power input end and the power output end. The short circuit detection module is connected between the output switch module and the power supply output end. The short circuit detection module comprises a pull-down resistor and a signal sampling end connected with the pull-down resistor. When short circuit occurs between the output switch module and the power supply output end, the access mode of the pull-down resistor changes to change the voltage sampling signal of the signal sampling end. Therefore, the short circuit condition between the output switch module and the power supply output end can be effectively identified based on the voltage sampling signal, so that the safety of the charging process is ensured.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and in particular to a charging circuit, a charging connection device, a short circuit detection method, a short circuit detection device, a short circuit detection system, and a computer-readable storage medium. Background Art

[0002] Amid the rapid growth of the electric vehicle industry, charging safety has become a key technical bottleneck hindering its widespread adoption. Charging connectors (such as charging piles and charging guns) serve as the core carriers of power transmission. The circuits from the main relay back end to the output end must carry high voltages and high currents, and are constantly exposed to dynamic thermal stress, mechanical vibration, and complex electromagnetic interference. Effectively identifying short circuits in the circuit from the main relay back end to the output end is crucial to ensuring charging safety. Summary of the Invention

[0003] The embodiments of the present application provide a charging circuit, a charging connection device, a short circuit detection method, a short circuit detection device, a short circuit detection system, and a computer-readable storage medium to solve at least one of the above-mentioned technical problems.

[0004] The charging circuit of the embodiment of the present application is used to connect to a charging power source to charge a load, and the charging circuit includes:

[0005] A power input terminal, used for connecting to the charging power supply;

[0006] A power output terminal, used for connecting to the load;

[0007] an output switch module, connected between the power input terminal and the power output terminal;

[0008] A short-circuit detection module is connected between the output switch module and the power output terminal. The short-circuit detection module includes a pull-down resistor and a signal sampling terminal connected to the pull-down resistor. When a short circuit occurs between the output switch module and the power output terminal, the access mode of the pull-down resistor changes to change the voltage sampling signal of the signal sampling terminal.

[0009] In some embodiments, the power output terminal includes a first power output terminal and a second power output terminal, and the pull-down resistor includes a first resistor and a second resistor, the first resistor is connected between the output switch module and the first power output terminal, and the second resistor is connected between the output switch module and the second power output terminal;

[0010] When a short circuit occurs between the output switch module and the power output terminal, the connection mode of the first resistor and / or the second resistor changes to change the voltage sampling signal of the signal sampling terminal.

[0011] In some embodiments, the signal sampling terminal includes a first signal sampling terminal and a second signal sampling terminal, the first signal sampling terminal is connected between the first resistor and the first power output terminal, and the second signal sampling terminal is connected between the second resistor and the second power output terminal;

[0012] When a short circuit occurs between the output switch module and the power output terminal, the connection mode of the first resistor and / or the second resistor changes to change the voltage sampling signal of the first signal sampling terminal and / or the voltage sampling signal of the second signal sampling terminal.

[0013] In some embodiments, the short circuit detection module also includes a pull-up resistor, which includes a third resistor and a fourth resistor, one end of the third resistor and one end of the fourth resistor are used to connect to the detection voltage, the other end of the third resistor is connected to one end of the first resistor and the first signal sampling end, the other end of the fourth resistor is connected to one end of the second resistor and the second signal sampling end, and the other end of the first resistor and the other end of the second resistor are connected to the ground end.

[0014] In some embodiments, the ratio of the resistance value of the third resistor to the resistance value of the first resistor is a first ratio, the ratio of the resistance value of the fourth resistor to the resistance value of the second resistor is a second ratio, and the first ratio is not equal to the second ratio.

[0015] In some embodiments, when the first power output terminal is short-circuited to the ground terminal, the first resistor is short-circuited to pull down the voltage sampling signal of the first signal sampling terminal.

[0016] In some embodiments, when the second power output terminal is short-circuited to the ground terminal, the second resistor is short-circuited to pull down the voltage sampling signal at the second signal sampling terminal.

[0017] In some embodiments, when the first power output terminal and the second power output terminal are short-circuited, the first resistor and the second resistor are connected in parallel to change the voltage sampling signal of the first signal sampling terminal and the voltage sampling signal of the second signal sampling terminal to a predetermined voltage value.

[0018] In some embodiments, when the first power output terminal, the second power output terminal, and the ground terminal are all short-circuited, the first resistor and the second resistor are short-circuited to pull down the voltage sampling signal of the first signal sampling terminal and the voltage sampling signal of the second signal sampling terminal.

[0019] In some embodiments, the charging circuit further includes a charging control module, the short-circuit detection module includes a first transistor and a first switching element, the first transistor is connected to the first switching element, the first switching element is connected between the signal sampling terminal and the power output terminal, and the charging control module is connected to the first transistor and the signal sampling terminal respectively;

[0020] The charging control module is used to output a first detection control signal to the first transistor to turn on the first transistor, and then turn on the first switching element. The charging control module is also used to obtain a voltage sampling signal from the signal sampling end to determine whether a short circuit occurs between the output switch module and the power supply output end based on the voltage sampling signal.

[0021] In some embodiments, when there is no short circuit between the output switch module and the power output terminal, the charging control module outputs a second detection control signal to the first transistor to turn off the first transistor, thereby turning off the first switch element.

[0022] In some embodiments, the first transistor is an NMOS transistor, the first detection control signal is a high-level signal, and the second detection control signal is a low-level signal.

[0023] In some embodiments, the output switch module includes a second transistor and a second switch element, the second transistor is connected to the second switch element, the second switch element is connected between the power input terminal and the power output terminal, and the charging control module is connected to the second transistor;

[0024] When a short circuit occurs between the output switch module and the power output terminal, the second switch element is disconnected;

[0025] When there is no short circuit between the output switch module and the power output terminal, the charging control module outputs a charging control signal to the second transistor to turn on the second transistor, thereby turning on the second switch element.

[0026] In some embodiments, the second transistor is an NMOS transistor, and the charging control signal is a high-level signal.

[0027] In some embodiments, the charging circuit further includes an auxiliary power supply module, which is connected to the charging control module and the short-circuit detection module respectively, and is used to provide a supply voltage for the charging control module and a detection voltage for the short-circuit detection module.

[0028] The charging connection device of the embodiment of the present application includes the charging circuit of any of the above embodiments, and the charging circuit is used to connect to a charging power source to charge a load.

[0029] In some embodiments, the charging connection device includes a charging pile or a charging gun.

[0030] In certain embodiments, the load comprises an energy storage battery of an electric vehicle.

[0031] The short-circuit detection method of the embodiment of the present application is applied to the charging circuit of any of the above embodiments, and the short-circuit detection method includes:

[0032] Acquiring a voltage sampling signal from the signal sampling terminal;

[0033] Determine whether a short circuit occurs between the output switch module and the power output terminal according to the voltage sampling signal.

[0034] In some embodiments, determining whether a short circuit occurs between the output switch module and the power output terminal according to the voltage sampling signal includes:

[0035] Determining that the first power supply output terminal is short-circuited to the ground terminal based on the voltage sampling signal of the first signal sampling terminal being pulled low;

[0036] According to the voltage sampling signal of the second signal sampling terminal being pulled low, it is determined that the second power supply output terminal is short-circuited with the ground terminal;

[0037] Determining that the first power supply output terminal and the second power supply output terminal are short-circuited according to the voltage sampling signal of the first signal sampling terminal and the voltage sampling signal of the second signal sampling terminal changing to predetermined voltage values;

[0038] According to the voltage sampling signal of the first signal sampling terminal and the voltage sampling signal of the second signal sampling terminal being pulled low, it is determined that the first power output terminal, the second power output terminal and the ground terminal are all short-circuited.

[0039] In some embodiments, the short circuit detection method further includes:

[0040] When a short circuit occurs between the output switch module and the power output terminal, the output switch module is controlled to be disconnected.

[0041] The short-circuit detection device of the embodiment of the present application is applied to the charging circuit of any of the above embodiments, and the short-circuit detection device includes:

[0042] An acquisition module, configured to acquire a voltage sampling signal from the signal sampling terminal;

[0043] A determination module is used to determine whether a short circuit occurs between the output switch module and the power output terminal according to the voltage sampling signal.

[0044] The short circuit detection system of the embodiment of the present application includes one or more processors and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the short circuit detection method of any of the above embodiments is implemented.

[0045] The computer-readable storage medium of the embodiment of the present application stores a computer program thereon, and when the program is executed by a processor, the short-circuit detection method of any of the above embodiments is implemented.

[0046] The charging circuit, charging connection device, short-circuit detection method, short-circuit detection device, short-circuit detection system, and computer-readable storage medium disclosed in the embodiments of the present application include a short-circuit detection module disposed between an output switch module and a power supply output terminal. The short-circuit detection module includes a pull-down resistor and a signal sampling terminal connected to the pull-down resistor. When a short circuit occurs between the output switch module and the power supply output terminal, the pull-down resistor's connection method changes to alter the voltage sampling signal at the signal sampling terminal. This voltage sampling signal effectively identifies a short circuit between the output switch module and the power supply output terminal, ensuring a safe charging process.

[0047] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. Among them:

[0049] Figure 1 is a schematic structural diagram of a charging circuit in certain embodiments of the present application;

[0050] Figure 2 is a schematic diagram of the working process of the charging circuit in certain embodiments of the present application;

[0051] Figure 3 is a schematic diagram of a module of a charging connection device according to certain embodiments of the present application;

[0052] Figure 4 is a schematic diagram of an application scenario of a charging connection device according to certain embodiments of the present application;

[0053] Figure 5is a flow chart of a short circuit detection method according to certain embodiments of the present application;

[0054] Figure 6 is a schematic diagram of a module of a short circuit detection device according to certain embodiments of the present application;

[0055] Figure 7 is a module schematic diagram of a short circuit detection system according to certain embodiments of the present application;

[0056] Figure 8 This is a schematic diagram of the connection status between a computer-readable storage medium and a processor in certain embodiments of the present application.

[0057] Description of reference numerals:

[0058] Charging circuit 100, power input terminal 10, power output terminal 20, output switch module 30, short circuit detection module 40, pull-down resistor 41, signal sampling terminal 42, first signal sampling terminal 421, second signal sampling terminal 422, pull-up resistor 43, charging control module 50, auxiliary power supply module 60;

[0059] Short circuit detection device 200, acquisition module 210, determination module 220, control module 230;

[0060] Short circuit detection system 300, processor 310, memory 320;

[0061] Computer-readable storage medium 400, computer program 410, processor 420;

[0062] Charging connection device 1000, load 2000;

[0063] A first power output terminal L-OUT, a second power output terminal N-OUT, a first power input terminal L-IN, a second power input terminal N-IN, and a ground terminal PE;

[0064] A first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first transistor Q1, a second transistor Q2, a first switch element K1, a second switch element K2, a first capacitor C1, a second capacitor C2, and a diode D1;

[0065] The detection voltage V0, the voltage sampling signal V1 of the first signal sampling terminal 421, and the voltage sampling signal V2 of the second signal sampling terminal 422. DETAILED DESCRIPTION

[0066] The following further describes the embodiments of the present application in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. Furthermore, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are intended only to explain the embodiments of the present application and are not to be construed as limiting the present application.

[0067] See also Figure 1 、 Figure 3 and Figure 4 The charging circuit 100 of the embodiment of the present application is used to connect to a charging power supply to charge a load 2000. The charging circuit 100 includes a power input terminal 10, a power output terminal 20, an output switch module 30, and a short-circuit detection module 40. The power input terminal 10 is used to connect to a charging power supply. The power output terminal 20 is used to connect to the load 2000. The output switch module 30 is connected between the power input terminal 10 and the power output terminal 20. The short-circuit detection module 40 is connected between the output switch module 30 and the power output terminal 20. The short-circuit detection module 40 includes a pull-down resistor 41 and a signal sampling terminal 42 connected to the pull-down resistor 41. When a short circuit occurs between the output switch module 30 and the power output terminal 20, the connection method of the pull-down resistor 41 changes to change the voltage sampling signal of the signal sampling terminal 42.

[0068] In the charging circuit 100 of the present embodiment, a short-circuit detection module 40 is provided between the output switch module 30 and the power output terminal 20. This short-circuit detection module 40 includes a pull-down resistor 41 and a signal sampling terminal 42 connected to the pull-down resistor 41. When a short circuit occurs between the output switch module 30 and the power output terminal 20, the connection method of the pull-down resistor 41 changes, thereby changing the voltage sampling signal at the signal sampling terminal 42. This allows the short circuit between the output switch module 30 and the power output terminal 20 to be effectively identified based on the voltage sampling signal, ensuring a safe charging process.

[0069] Specifically, charging circuit 100 may be an AC charging circuit. The charging power source may be, for example, the power grid, and load 2000 may be, for example, the energy storage battery of an electric vehicle. Charging circuit 100 is configured to connect to the charging power source to transmit electrical energy from the power grid to the energy storage battery of the electric vehicle, thereby charging the energy storage battery of the electric vehicle.

[0070] The charging circuit 100 includes a power input terminal 10 , a power output terminal 20 , an output switch module 30 and a short circuit detection module 40 .

[0071] The power input terminal 10 may be directly or indirectly connected to a charging power source, and the power output terminal 20 may be directly or indirectly connected to a load 2000 , which is not limited here.

[0072] The output switch module 30 can be a main relay part. The output switch module 30 is connected between the power input terminal 10 and the power output terminal 20 and serves as a switch for controlling the charging power supply to charge the load 2000.

[0073] The short-circuit detection module 40 is connected between the output switch module 30 and the power supply output terminal 20. The short-circuit detection module 40 includes a pull-down resistor 41 and a signal sampling terminal 42 connected to the pull-down resistor 41. One end of the pull-down resistor 41 can be connected to the signal sampling terminal 42, and the other end of the pull-down resistor 41 is connected to the ground terminal PE. The signal sampling terminal 42 is also directly or indirectly connected to the power supply output terminal 20. When a short circuit occurs between the output switch module 30 and the power supply output terminal 20, the connection method of the pull-down resistor 41 changes, thereby changing the voltage sampling signal at the signal sampling terminal 42.

[0074] In this way, the voltage sampling signal can effectively identify a short circuit between the output switch module 30 and the power output terminal 20, ensuring a safe charging process. For example, if the voltage sampling signal changes, indicating a possible short circuit between the output switch module 30 and the power output terminal 20, the output switch module 30 can be used to disconnect the charging power supply from charging the load 2000. The charging connection device 1000 is in a protection state and does not operate.

[0075] See also Figure 1 In some embodiments, the power output terminal 20 includes a first power output terminal L-OUT and a second power output terminal N-OUT. The pull-down resistor 41 includes a first resistor R1 and a second resistor R2. The first resistor R1 is connected between the output switch module 30 and the first power output terminal L-OUT. The second resistor R2 is connected between the output switch module 30 and the second power output terminal N-OUT. When a short circuit occurs between the output switch module 30 and the power output terminal 20, the connection mode of the first resistor R1 and / or the second resistor R2 changes to change the voltage sampling signal of the signal sampling terminal 42.

[0076] Furthermore, the signal sampling terminal 42 may include a first signal sampling terminal 421 and a second signal sampling terminal 422. The first signal sampling terminal 421 is connected between the first resistor R1 and the first power output terminal L-OUT. The second signal sampling terminal 422 is connected between the second resistor R2 and the second power output terminal N-OUT. When a short circuit occurs between the output switch module 30 and the power output terminal 20, the connection mode of the first resistor R1 and / or the second resistor R2 changes to change the voltage sampling signal V1 at the first signal sampling terminal 421 and / or the voltage sampling signal V2 at the second signal sampling terminal 422.

[0077] Specifically, the power output terminal 20 includes a first power output terminal L-OUT and a second power output terminal N-OUT. The first power output terminal L-OUT can be a live output terminal, and the second power output terminal N-OUT can be a neutral output terminal. The first power output terminal L-OUT and the second power output terminal N-OUT are both used to connect to the load 2000. In addition, the power input terminal 10 may include a first power input terminal L-IN and a second power input terminal N-IN. The first power input terminal L-IN can be a live input terminal, and the second power input terminal N-IN can be a neutral input terminal. The first power input terminal L-IN and the second power input terminal N-IN are both used to connect to a charging power source.

[0078] The pull-down resistor 41 includes a first resistor R1 and a second resistor R2. The signal sampling terminal 42 includes a first signal sampling terminal 421 and a second signal sampling terminal 422. One end of the first resistor R1 can be connected to the first signal sampling terminal 421, and the other end of the first resistor R1 is connected to the ground terminal PE. One end of the second resistor R2 can be connected to the second signal sampling terminal 422, and the other end of the second resistor R2 is connected to the ground terminal PE. The first signal sampling terminal 421 is also directly or indirectly connected to the first power output terminal L-OUT, and the second signal sampling terminal 422 is also directly or indirectly connected to the second power output terminal N-OUT.

[0079] When a short circuit occurs between the output switch module 30 and the power output terminal 20, the connection method of the first resistor R1 and / or the second resistor R2 changes to change the voltage sampling signal V1 at the first signal sampling terminal 421 and / or the voltage sampling signal V2 at the second signal sampling terminal 422. For example, when the first resistor R1 is short-circuited, the voltage sampling signal V1 at the first signal sampling terminal 421 will be pulled low; when the second resistor R2 is short-circuited, the voltage sampling signal V2 at the second signal sampling terminal 422 will be pulled low; when the first resistor R1 and the second resistor R2 are short-circuited, the voltage sampling signal V1 at the first signal sampling terminal 421 and the voltage sampling signal V2 at the second signal sampling terminal 422 will be pulled low, and so on. Examples are not given here one by one.

[0080] In this way, based on the voltage sampling signal V1 of the first signal sampling terminal 421 and / or the voltage sampling signal V2 of the second signal sampling terminal 422, the short circuit between the output switch module 30 and the power output terminal 20 can be effectively identified to ensure the safety of the charging process.

[0081] See also Figure 1In some embodiments, the short circuit detection module 40 further includes a pull-up resistor 43. The pull-up resistor 43 includes a third resistor R3 and a fourth resistor R4. One end of the third resistor R3 and one end of the fourth resistor R4 are connected to the detection voltage V0. The other end of the third resistor R3 is connected to one end of the first resistor R1 and the first signal sampling terminal 421. The other end of the fourth resistor R4 is connected to one end of the second resistor R2 and the second signal sampling terminal 422. The other end of the first resistor R1 and the other end of the second resistor R2 are connected to the ground terminal PE.

[0082] Specifically, the short circuit detection module 40 further includes a pull-up resistor 43 . One end of the pull-up resistor 43 is connected to the detection voltage V0 , and the other end of the pull-up resistor 43 is connected to one end of the pull-down resistor 41 and the signal sampling terminal 42 .

[0083] like Figure 1 As shown, the pull-up resistor 43 includes a third resistor R3 and a fourth resistor R4. The third resistor R3 is connected in series with the first resistor R1, and the fourth resistor R4 is connected in series with the second resistor R2. One end of the third resistor R3 and one end of the fourth resistor R4 are used to connect to the detection voltage V0. The other end of the third resistor R3 is connected to one end of the first resistor R1 and the first signal sampling terminal 421. The other end of the fourth resistor R4 is connected to one end of the second resistor R2 and the second signal sampling terminal 422. The other end of the first resistor R1 and the other end of the second resistor R2 are connected to the ground terminal PE. The first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 can form a proportional voltage divider circuit to identify a short circuit between the output switch module 30 and the power output terminal 20 based on the voltage sampling signal V1 of the first signal sampling terminal 421 and / or the voltage sampling signal V2 of the second signal sampling terminal 422.

[0084] Assuming that the resistance value of the first resistor R1 is represented by r1, the resistance value of the second resistor R2 is represented by r2, the resistance value of the third resistor R3 is represented by r3, and the resistance value of the fourth resistor R4 is represented by r4, then in the initial state of power-on:

[0085] The pull-up resistor 43 of the detection circuit where the first power output terminal L-OUT is located is the third resistor R3, the pull-down resistor 41 is the first resistor R1, and the voltage sampling signal of the first signal sampling terminal 421 is

[0086] The pull-up resistor 43 of the detection circuit where the second power output terminal N-OUT is located is the fourth resistor R4, the pull-down resistor 41 is the second resistor R2, and the voltage sampling signal of the second signal sampling terminal 422 is

[0087] Various situations in which a short circuit occurs between the output switch module 30 and the power output terminal 20 and corresponding state determination conditions are described below.

[0088] See also Figure 1 In some embodiments, when the first power output terminal L-OUT is short-circuited to the ground terminal PE, the first resistor R1 is short-circuited to pull down the voltage sampling signal V1 of the first signal sampling terminal 421 .

[0089] Specifically, if the first power output terminal L-OUT and the ground terminal PE are not short-circuited, then as mentioned above, the voltage sampling signal of the first signal sampling terminal 421 is The voltage sampling signal of the second signal sampling terminal 422 If the first power output terminal L-OUT is short-circuited to the ground terminal PE, the first resistor R1 will be short-circuited, the voltage sampling signal V1 at the first signal sampling terminal 421 will be low (e.g., V1 = 0), and the voltage sampling signal V2 at the second signal sampling terminal 422 will remain unchanged. Thus, based on the voltage sampling signal V1 at the first signal sampling terminal 421 being pulled low, it can be determined that the first power output terminal L-OUT is short-circuited to the ground terminal PE.

[0090] See also Figure 1 In some embodiments, when the second power output terminal N-OUT is short-circuited to the ground terminal PE, the second resistor R2 is short-circuited to pull down the voltage sampling signal V2 of the second signal sampling terminal 422.

[0091] Specifically, if the second power output terminal N-OUT and the ground terminal PE are not short-circuited, then as mentioned above, the voltage sampling signal of the first signal sampling terminal 421 is The voltage sampling signal of the second signal sampling terminal 422 If the second power output terminal N-OUT is short-circuited to the ground terminal PE, the second resistor R2 will be short-circuited, the voltage sampling signal V1 at the first signal sampling terminal 421 will remain unchanged, and the voltage sampling signal V2 at the second signal sampling terminal 422 will be low (e.g., V2 = 0). In this way, based on the voltage sampling signal V2 at the second signal sampling terminal 422 being pulled low, it can be determined that the second power output terminal N-OUT is short-circuited to the ground terminal PE.

[0092] See also Figure 1 In some embodiments, when the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited, the first resistor R1 and the second resistor R2 are connected in parallel to change the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 to a predetermined voltage value.

[0093] Specifically, if the first power output terminal L-OUT and the second power output terminal N-OUT are not short-circuited, then as mentioned above, the voltage sampling signal of the first signal sampling terminal 421 is The voltage sampling signal of the second signal sampling terminal 422 If the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited, the first signal sampling terminal 421 is connected to the second signal sampling terminal 422, and the third resistor R3 and the fourth resistor R4 are connected in parallel as a pull-up resistor 43, whose resistance is The first resistor R1 and the second resistor R2 are connected in parallel to form a pull-down resistor 41, whose resistance is Then the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 satisfy the relationship After calculation, we can get:

[0094]

[0095] Based on the different values of r1, r2, r3, and r4, Relative to as well as Relative to It may be pulled high or pulled low. Specifically, the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 are changed to a predetermined voltage value. It can be determined that the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited.

[0096] Furthermore, for ease of calculation, the resistance of the first resistor R1 and the resistance of the fourth resistor R4 can be set to a, that is, r1 = r4 = a. The resistance of the second resistor R2 and the resistance of the third resistor R3 can be set to b, that is, r2 = r3 = b. Wherein, a≠b. Of course, in other examples, the resistances of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 can also be different from each other, which is not limited here. The above expression can be simplified to:

[0097]

[0098] At this time, the predetermined voltage value is Thus, based on the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 becoming half of the detection voltage V0, it can be determined that the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited.

[0099] See also Figure 1 In some embodiments, when the first power output terminal L-OUT, the second power output terminal N-OUT, and the ground terminal PE are all short-circuited, the first resistor R1 and the second resistor R2 are short-circuited to pull down the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422.

[0100] Specifically, if the first power output terminal L-OUT, the second power output terminal N-OUT, and the ground terminal PE are not short-circuited, then as mentioned above, the voltage sampling signal of the first signal sampling terminal 421 is The voltage sampling signal of the second signal sampling terminal 422 If the first power output terminal L-OUT, the second power output terminal N-OUT, and the ground terminal PE are all short-circuited, the first resistor R1 and the second resistor R2 will be short-circuited, and the first signal sampling terminal 421 will be connected to the second signal sampling terminal 422. The voltage sampling signal V1 at the first signal sampling terminal 421 and the voltage sampling signal V2 at the second signal sampling terminal 422 will be equal, that is, V1 = V2, and both will be low (e.g., V1 = V2 = 0). In this way, based on the voltage sampling signal V1 at the first signal sampling terminal 421 and the voltage sampling signal V2 at the second signal sampling terminal 422 being pulled low at the same time, it can be determined that the first power output terminal L-OUT, the second power output terminal N-OUT, and the ground terminal PE are all short-circuited.

[0101] As can be seen from the above, the charging circuit 100 of the embodiment of the present application can effectively detect and identify various short-circuit scenarios between the output switch module 30 and the power output terminal 20 (the first power output terminal L-OUT is short-circuited with the ground terminal PE, the second power output terminal N-OUT is short-circuited with the ground terminal PE, the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited, and the first power output terminal L-OUT, the second power output terminal N-OUT, and the ground terminal PE are all short-circuited) to ensure the safety of the charging process and avoid damage to the charging connection device 1000.

[0102] In some embodiments, the ratio of the resistance of the third resistor R3 to the resistance of the first resistor R1 is a first ratio, and the ratio of the resistance of the fourth resistor R4 to the resistance of the second resistor R2 is a second ratio, and the first ratio is not equal to the second ratio.

[0103] That is to say, the resistance values of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 meet the condition

[0104] Research has found that if Assuming this ratio is k, then in the initial state of power on: the voltage sampling signal of the first signal sampling terminal 421 is The voltage sampling signal of the second signal sampling terminal 422 That is, V1=V2. Then, when the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited, the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 satisfy the relationship As can be seen, when the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited, the voltage sampling signal V1 at the first signal sampling terminal 421 and the voltage sampling signal V2 at the second signal sampling terminal 422 have the same value as when they are not short-circuited, making it difficult to determine whether the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited. However, in the embodiment of the present application, the first ratio and the second ratio are not equal, which facilitates accurate identification of whether the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited.

[0105] See also Figure 1 In some embodiments, the charging circuit 100 further includes a charging control module 50. The short circuit detection module 40 includes a first transistor Q1 and a first switching element K1. The first transistor Q1 is connected to the first switching element K1, and the first switching element K1 is connected between the signal sampling terminal 42 and the power output terminal 20. The charging control module 50 is connected to the first transistor Q1 and the signal sampling terminal 42, respectively. The charging control module 50 is configured to output a first detection control signal to the first transistor Q1 to turn on the first transistor Q1, thereby turning on the first switching element K1. The charging control module 50 is further configured to obtain a voltage sampling signal from the signal sampling terminal 42 to determine whether a short circuit occurs between the output switch module 30 and the power output terminal 20 based on the voltage sampling signal.

[0106] Specifically, the charging circuit 100 further includes a charging control module 50. The charging control module 50 may be a microcontroller unit (MCU).

[0107] The short-circuit detection module 40 includes a first transistor Q1 and a first switch element K1. The first transistor Q1 may be an N-type Metal-Oxide-Semiconductor Field-Effect Transistor (NMOS). The first switch element K1 may be an electronic switch, such as a relay, a photorelay, a thyristor optocoupler, or the like.

[0108] The source of the first transistor Q1 is grounded. The drain of the first transistor Q1 is connected to one end of the first switching element K1, and the other end of the first switching element K1 is connected between the signal sampling terminal 42 and the power output terminal 20. The charging control module 50 is respectively connected to the gate of the first transistor Q1 and the signal sampling terminal 42. In addition, the short circuit detection module 40 may also include a fifth resistor R5, a sixth resistor R6 and a first capacitor C1 connected to the gate of the first transistor Q1, and a seventh resistor R7 connected between the other end of the first switching element K1 and the second predetermined voltage Vcc2. The fifth resistor R5 is a current limiting resistor of the first transistor Q1, the sixth resistor R6 is a discharge resistor of the first transistor Q1, and the first capacitor C1 is a filter capacitor of the first transistor Q1. The seventh resistor R7 is a current limiting resistor.

[0109] The charging control module 50 is used to output a first detection control signal to the first transistor Q1 to turn on the first transistor Q1, and then the first switch element K1 is also turned on, at which time the short circuit detection starts. The first detection control signal is a high-level signal. The charging control module 50 is also used to obtain a voltage sampling signal from the signal sampling terminal 42 to determine whether a short circuit occurs between the output switch module 30 and the power output terminal 20 based on the voltage sampling signal. For example, the voltage sampling signal V1 is obtained from the first signal sampling terminal 421 and the voltage sampling signal V2 is obtained from the second signal sampling terminal 422 to determine whether a short circuit occurs between the output switch module 30 and the power output terminal 20 based on the voltage sampling signal V1 of the first signal sampling terminal 421 and / or the voltage sampling signal V2 of the second signal sampling terminal 422.

[0110] See also Figure 1 In some embodiments, when there is no short circuit between the output switch module 30 and the power output terminal 20, the charging control module 50 outputs a second detection control signal to the first transistor Q1 to disconnect the first transistor Q1, thereby disconnecting the first switch element K1.

[0111] Specifically, when no short circuit occurs between the output switch module 30 and the power output terminal 20, that is, when none of the above-mentioned short circuit situations occurs, the charging control module 50 outputs a second detection control signal to the first transistor Q1 to turn off the first transistor Q1, thereby also turning off the first switch element K1. At this time, short circuit detection is completed. The second detection control signal is a low-level signal.

[0112] See also Figure 1In some embodiments, the output switch module 30 includes a second transistor Q2 and a second switch element K2. The second transistor Q2 is connected to the second switch element K2, which is connected between the power input terminal 10 and the power output terminal 20. The charging control module 50 is connected to the second transistor Q2. When a short circuit occurs between the output switch module 30 and the power output terminal 20, the second switch element K2 is turned off. When a short circuit does not occur between the output switch module 30 and the power output terminal 20, the charging control module 50 outputs a charging control signal to the second transistor Q2, turning on the second transistor Q2 and, in turn, the second switch element K2.

[0113] Specifically, the output switch module 30 includes a second transistor Q2 and a second switch element K2. The second transistor Q2 may be an NMOS transistor. The second switch element K2 may be an electronic switch, such as a relay, a photorelay, a thyristor optocoupler, or the like.

[0114] The source of the second transistor Q2 is grounded. The drain of the second transistor Q2 is connected to one end of the second switch element K2, one end of the second switch element K2 is also connected to the power input terminal 10, and the other end of the second switch element K2 is connected to the power output terminal 20. The charging control module 50 is connected to the gate of the second transistor Q2. In addition, the output switch module 30 may also include an eighth resistor R8, a ninth resistor R9, and a second capacitor C2 connected to the gate of the second transistor Q2, and a diode D1 connected between the drain of the second transistor Q2 and the first predetermined voltage Vcc1. The eighth resistor R8 is a current limiting resistor for the second transistor Q2, the ninth resistor R9 is a discharge resistor for the second transistor Q2, and the second capacitor C2 is a filter capacitor for the second transistor Q2. The diode D1 is a discharge diode.

[0115] When a short circuit occurs between the output switch module 30 and the power output terminal 20, the charging control module 50 does not output a charging control signal, the second switch element K2 is disconnected, and the charging connection device 1000 enters a protection state and does not operate. When a short circuit does not occur between the output switch module 30 and the power output terminal 20, the charging control module 50 outputs a charging control signal to the second transistor Q2, turning on the second transistor Q2 and closing the second switch element K2. The charging connection device 1000 can normally transfer power from the charging power source to the load 2000. The charging control signal is a high-level signal.

[0116] See also Figure 1 In some embodiments, the charging circuit 100 further includes an auxiliary power supply module 60. The auxiliary power supply module 60 is connected to the charging control module 50 and the short-circuit detection module 40, respectively, and is configured to provide a supply voltage to the charging control module 50 and a detection voltage V0 to the short-circuit detection module 40.

[0117] Specifically, the auxiliary power supply module 60 can provide a supply voltage to the charging control module 50 and a detection voltage V0 to the short-circuit detection module 40. After the auxiliary power supply module 60 provides the supply voltage to the charging control module 50 and the detection voltage V0 to the short-circuit detection module 40, the charging circuit 100 according to the embodiment of the present application can continue to operate, constantly monitoring the short circuit condition in the circuit. The auxiliary power supply module 60 can also provide a supply voltage to the first switching element K1 and the second switching element K2. In other words, the aforementioned second predetermined voltage Vcc2 and first predetermined voltage Vcc1 can be provided by the auxiliary power supply module 60.

[0118] Of course, when the charging circuit 100 includes more functional modules, the auxiliary power supply module 60 can also power these functional modules, without limitation. Furthermore, the auxiliary power supply module 60 can also be connected to the aforementioned first power input terminal L-IN and second power input terminal N-IN to obtain power from the charging power source.

[0119] The following combination Figure 1 and Figure 2 The short-circuit detection process of the charging circuit 100 according to the embodiment of the present application is described.

[0120] The charging circuit 100 is composed of an auxiliary power supply module 60, a charging control module 50, an output switch module 30, and a short circuit detection module 40. The auxiliary power supply module 60 provides a supply voltage to the charging control module 50 and provides a detection voltage V0 to the short circuit detection module 40. For ease of calculation, the resistance of the first resistor R1 and the fourth resistor R4 can be set to a, and the resistance of the third resistor R3 and the second resistor R2 can be set to b. In the initial state of power on, the voltage sampling signal of the first signal sampling terminal 421 is The voltage sampling signal of the second signal sampling terminal 422

[0121] The charging control module 50 outputs a first detection control signal to the first transistor Q1 to turn on the first transistor Q1 and the first switch element K1 , thereby starting short circuit detection.

[0122] The charging control module 50 obtains the voltage sampling signal V1 from the first signal sampling terminal 421 and the voltage sampling signal V2 from the second signal sampling terminal 422, respectively, to determine whether a short circuit occurs between the output switch module 30 and the power output terminal 20 based on the voltage sampling signal V1 of the first signal sampling terminal 421 and / or the voltage sampling signal V2 of the second signal sampling terminal 422.

[0123] The short circuit condition is determined based on the following:

[0124] (1) If the first power output terminal L-OUT is short-circuited to the ground terminal PE, the first resistor R1 will be short-circuited, and the voltage sampling signal V1 of the first signal sampling terminal 421 will be low level;

[0125] (2) If the second power output terminal N-OUT is short-circuited to the ground terminal PE, the second resistor R2 will be short-circuited, and the voltage sampling signal V2 of the second signal sampling terminal 422 will be low level;

[0126] (3) If the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited, the first signal sampling terminal 421 is connected to the second signal sampling terminal 422, and the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 are both half of the detection voltage V0, that is,

[0127] (4) If the first power output terminal L-OUT, the second power output terminal N-OUT, and the ground terminal PE are all short-circuited, the first resistor R1 and the second resistor R2 will be short-circuited, and the first signal sampling terminal 421 is connected to the second signal sampling terminal 422. The voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 are equal, that is, V1=V2, and both are low level.

[0128] like Figure 2 As shown, in one example, the short circuit detection process can be as follows:

[0129] First, determine whether V1≠V2 exists.

[0130] If V1≠V2 exists, then determine whether If exists Then determine whether If exists This indicates that there is no short circuit between the output switch module 30 and the power output terminal 20. The charging control module 50 outputs a second detection control signal to the first transistor Q1 to turn off the first transistor Q1, and thus the first switch element K1 is also turned off, at which point the short circuit detection is complete. The second detection control signal is a low-level signal. The charging control module 50 then outputs a charging control signal to the second transistor Q2 to turn on the second transistor Q2, and thus the second switch element K2 is also attracted. The charging connection device 1000 can normally transmit electrical energy from the charging power supply to the load 2000. The charging control signal is a high-level signal.

[0131] If V1≠V2 does not exist, then determine whether V1=V2=0. If V1=V2=0 exists, it means that the first power output terminal L-OUT, the second power output terminal N-OUT, and the ground terminal PE are all short-circuited, and the charging connection device 1000 enters the protection state. If V1=V2=0 does not exist, then determine whether If exists This indicates that the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited, and the charging connection device 1000 enters the protection state. Then return to re-test the short circuit to avoid errors in the test.

[0132] If it does not exist Then, it is determined whether V1 = 0 exists. If V1 = 0 exists, it indicates that the first power output terminal L-OUT is short-circuited with the ground terminal PE, and the charging connection device 1000 enters the protection state. If V1 = 0 does not exist, the short-circuit detection is repeated to avoid detection errors.

[0133] If it does not exist Then, it is determined whether V2 = 0 exists. If V2 = 0 exists, it indicates that the second power output terminal N-OUT is short-circuited with the ground terminal PE, and the charging connection device 1000 enters the protection state. If V2 = 0 does not exist, the short-circuit detection is repeated to avoid detection errors.

[0134] In summary, the charging circuit 100 of the embodiment of the present application can effectively detect and identify various short circuit scenarios between the output switch module 30 and the power output terminal 20, thereby ensuring the safety of the charging process and preventing damage to the charging connection device 1000. In addition, the software workflow is clear and concise.

[0135] See also Figure 3 and Figure 4 The charging connection device 1000 of the embodiment of the present application includes the charging circuit 100 of any of the above embodiments. The charging circuit 100 is used to connect to a charging power source to charge a load 2000. The charging connection device 1000 includes a charging pile or charging gun. The load 2000 includes an energy storage battery of an electric vehicle.

[0136] Specifically, a charging station is a device fixed to the ground or wall, and a charging gun is used to connect to an electric vehicle. The charging station can be connected to the power grid and transmit electrical energy to the battery of the electric vehicle through the charging gun. The charging circuit 100 of the embodiment of the present application can be applied to either a charging station or a charging gun.

[0137] See also Figure 5 The short circuit detection method of the embodiment of the present application is applied to the charging circuit 100 of any of the above embodiments. The short circuit detection method includes:

[0138] 010: Obtain the voltage sampling signal of the signal sampling terminal 42;

[0139] 020: Determine whether a short circuit occurs between the output switch module 30 and the power output terminal 20 according to the voltage sampling signal.

[0140] In the short-circuit detection method of the present embodiment, a short-circuit detection module 40 is disposed between the output switch module 30 and the power output terminal 20. The short-circuit detection module 40 includes a pull-down resistor 41 and a signal sampling terminal 42 connected to the pull-down resistor 41. When a short circuit occurs between the output switch module 30 and the power output terminal 20, the connection method of the pull-down resistor 41 changes to change the voltage sampling signal at the signal sampling terminal 42. In this way, based on the voltage sampling signal, a short circuit between the output switch module 30 and the power output terminal 20 can be effectively identified, thereby ensuring the safety of the charging process.

[0141] In some embodiments, determining whether a short circuit (i.e., 020) occurs between the output switch module 30 and the power output terminal 20 based on the voltage sampling signal includes:

[0142] According to the voltage sampling signal V1 of the first signal sampling terminal 421 being pulled low, it is determined that the first power output terminal L-OUT is short-circuited with the ground terminal PE;

[0143] According to the voltage sampling signal V2 of the second signal sampling terminal 422 being pulled low, it is determined that the second power output terminal N-OUT is short-circuited with the ground terminal PE;

[0144] According to the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 changing to predetermined voltage values, it is determined that the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited;

[0145] According to the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 being pulled low, it is determined that the first power output terminal L-OUT, the second power output terminal N-OUT and the ground terminal PE are all short-circuited.

[0146] Specifically, the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 can be pulled up or down to a predetermined voltage value. Determine that the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited. Figure 2 The process is executed in sequence, and the details can be referred to the part of the aforementioned charging circuit 100. Figure 2 The description of the short circuit detection process will not be repeated here.

[0147] In some embodiments, the short circuit detection method further comprises:

[0148] 030: When a short circuit occurs between the output switch module 30 and the power output terminal 20, the output switch module 30 is controlled to be disconnected.

[0149] Specifically, the second switch element K2 is controlled to be disconnected, so that the charging connection device 1000 is in a protection state. In this way, the charging power supply can be disconnected from charging the load 2000.

[0150] It should be noted that the explanation of the charging circuit 100 in the aforementioned embodiment is also applicable to the short-circuit detection method in the embodiment of the present application, and will not be further explained here.

[0151] See also Figure 6 The short-circuit detection device 200 of the present embodiment is applicable to the charging circuit 100 of any of the above-described embodiments. The short-circuit detection device 200 includes an acquisition module 210 and a determination module 220. The acquisition module 210 is configured to acquire a voltage sampling signal from the signal sampling terminal 42. The determination module 220 is configured to determine whether a short circuit occurs between the output switch module 30 and the power supply output terminal 20 based on the voltage sampling signal.

[0152] In some embodiments, the determination module 220 is specifically used to: determine that the first power output terminal L-OUT is short-circuited with the ground terminal PE based on the voltage sampling signal V1 of the first signal sampling terminal 421 being pulled low; determine that the second power output terminal N-OUT is short-circuited with the ground terminal PE based on the voltage sampling signal V2 of the second signal sampling terminal 422 being pulled low; determine that the first power output terminal L-OUT is short-circuited with the second power output terminal N-OUT based on the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 changing to a predetermined voltage value; determine that the first power output terminal L-OUT, the second power output terminal N-OUT, and the ground terminal PE are all short-circuited based on the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 being pulled low.

[0153] In some embodiments, the short circuit detection device 200 further includes a control module 230. The control module 230 is configured to control the output switch module 30 to be disconnected when a short circuit occurs between the output switch module 30 and the power output terminal 20.

[0154] It should be noted that the explanation of the short-circuit detection method in the aforementioned embodiment is also applicable to the short-circuit detection device 200 in the embodiment of the present application, and will not be elaborated here.

[0155] See also Figure 7The short circuit detection system 300 of the embodiment of the present application includes one or more processors 310 and a memory 320, wherein the memory 320 stores a computer program. When the computer program is executed by the processor 310, the short circuit detection method of any of the above embodiments is implemented.

[0156] For example, when the computer program is executed by the processor 310, the following short circuit detection method is implemented:

[0157] 010: Obtain the voltage sampling signal of the signal sampling terminal 42;

[0158] 020: Determine whether a short circuit occurs between the output switch module 30 and the power output terminal 20 according to the voltage sampling signal.

[0159] For another example, when the computer program is executed by the processor 310, the following short circuit detection method is implemented:

[0160] According to the voltage sampling signal V1 of the first signal sampling terminal 421 being pulled low, it is determined that the first power output terminal L-OUT is short-circuited with the ground terminal PE;

[0161] According to the voltage sampling signal V2 of the second signal sampling terminal 422 being pulled low, it is determined that the second power output terminal N-OUT is short-circuited with the ground terminal PE;

[0162] According to the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 changing to predetermined voltage values, it is determined that the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited;

[0163] According to the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 being pulled low, it is determined that the first power output terminal L-OUT, the second power output terminal N-OUT and the ground terminal PE are all short-circuited.

[0164] It should be noted that the explanation of the short-circuit detection method in the aforementioned embodiment is also applicable to the short-circuit detection system 300 of the embodiment of the present application, and will not be further explained here.

[0165] See also Figure 8 The computer-readable storage medium 400 of the embodiment of the present application stores a computer program 410. When the program is executed by the processor 420, the short circuit detection method of any of the above embodiments is implemented.

[0166] For example, when the program is executed by the processor 420, the following short circuit detection method is implemented:

[0167] 010: Obtain the voltage sampling signal of the signal sampling terminal 42;

[0168] 020: Determine whether a short circuit occurs between the output switch module 30 and the power output terminal 20 according to the voltage sampling signal.

[0169] For another example, when the program is executed by the processor 420, the following short circuit detection method is implemented:

[0170] According to the voltage sampling signal V1 of the first signal sampling terminal 421 being pulled low, it is determined that the first power output terminal L-OUT is short-circuited with the ground terminal PE;

[0171] According to the voltage sampling signal V2 of the second signal sampling terminal 422 being pulled low, it is determined that the second power output terminal N-OUT is short-circuited with the ground terminal PE;

[0172] According to the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 changing to predetermined voltage values, it is determined that the first power output terminal L-OUT and the second power output terminal N-OUT are short-circuited;

[0173] According to the voltage sampling signal V1 of the first signal sampling terminal 421 and the voltage sampling signal V2 of the second signal sampling terminal 422 being pulled low, it is determined that the first power output terminal L-OUT, the second power output terminal N-OUT and the ground terminal PE are all short-circuited.

[0174] It should be noted that the explanation of the short-circuit detection method in the aforementioned embodiment is also applicable to the computer-readable storage medium 400 in the embodiment of the present application, and will not be elaborated here.

[0175] In summary, the charging circuit 100, charging connection device 1000, short-circuit detection method, short-circuit detection device 200, short-circuit detection system 300, and computer-readable storage medium 400 of the embodiments of the present application include a short-circuit detection module 40 disposed between the output switch module 30 and the power output terminal 20. The short-circuit detection module 40 includes a pull-down resistor 41 and a signal sampling terminal 42 connected to the pull-down resistor 41. When a short circuit occurs between the output switch module 30 and the power output terminal 20, the connection method of the pull-down resistor 41 changes to change the voltage sampling signal at the signal sampling terminal 42. In this way, a short circuit between the output switch module 30 and the power output terminal 20 can be effectively identified based on the voltage sampling signal, thereby ensuring a safe charging process.

[0176] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0177] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0178] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0179] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable storage medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a computer-readable storage medium can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable storage media include the following: an electrical connection having one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable storage medium may even be paper or other suitable medium on which the program is printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner as necessary, and then stored in a computer memory.

[0180] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0181] Those skilled in the art will appreciate that all or part of the steps carried out in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment. In addition, the various functional units in the various embodiments of the present application can be integrated into a processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. The storage medium mentioned above can be a read-only memory, a disk or an optical disk, etc.

[0182] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A charging circuit (100), characterized in that: The charging circuit (100) is used to connect to a charging power source to charge a load (2000), and the charging circuit (100) comprises: A power input terminal (10) for connecting to the charging power supply; A power output terminal (20) for connecting to the load (2000); an output switch module (30), connected between the power input terminal (10) and the power output terminal (20); A short circuit detection module (40) is connected between the output switch module (30) and the power supply output terminal (20). The short circuit detection module (40) comprises a pull-down resistor (41) and a signal sampling terminal (42) connected to the pull-down resistor (41). When a short circuit occurs between the output switch module (30) and the power supply output terminal (20), the access mode of the pull-down resistor (41) changes to change the voltage sampling signal of the signal sampling terminal (42).

2. The charging circuit (100) according to claim 1, characterized in that The power output terminal (20) includes a first power output terminal (L-OUT) and a second power output terminal (N-OUT); the pull-down resistor (41) includes a first resistor (R1) and a second resistor (R2); the first resistor (R1) is connected between the output switch module (30) and the first power output terminal (L-OUT); and the second resistor (R2) is connected between the output switch module (30) and the second power output terminal (N-OUT); When a short circuit occurs between the output switch module (30) and the power supply output terminal (20), the access mode of the first resistor (R1) and / or the second resistor (R2) changes to change the voltage sampling signal of the signal sampling terminal (42).

3. The charging circuit (100) according to claim 2, characterized in that The signal sampling terminal (42) comprises a first signal sampling terminal (421) and a second signal sampling terminal (422), wherein the first signal sampling terminal (421) is connected between the first resistor (R1) and the first power output terminal (L-OUT), and the second signal sampling terminal (422) is connected between the second resistor (R2) and the second power output terminal (N-OUT); When a short circuit occurs between the output switch module (30) and the power supply output terminal (20), the access mode of the first resistor (R1) and / or the second resistor (R2) changes to change the voltage sampling signal (V1) of the first signal sampling terminal (421) and / or the voltage sampling signal (V2) of the second signal sampling terminal (422).

4. The charging circuit (100) according to claim 3, characterized in that The short circuit detection module (40) further includes a pull-up resistor (43), the pull-up resistor (43) including a third resistor (R3) and a fourth resistor (R4), one end of the third resistor (R3) and one end of the fourth resistor (R4) are used to connect to a detection voltage (V0), the other end of the third resistor (R3) is connected to one end of the first resistor (R1) and the first signal sampling terminal (421), the other end of the fourth resistor (R4) is connected to one end of the second resistor (R2) and the second signal sampling terminal (422), and the other end of the first resistor (R1) and the other end of the second resistor (R2) are connected to a ground terminal (PE).

5. The charging circuit (100) according to claim 4, characterized in that The ratio of the resistance value of the third resistor (R3) to the resistance value of the first resistor (R1) is a first ratio, the ratio of the resistance value of the fourth resistor (R4) to the resistance value of the second resistor (R2) is a second ratio, and the first ratio is not equal to the second ratio.

6. The charging circuit (100) according to claim 4, characterized in that When the first power output terminal (L-OUT) and the ground terminal (PE) are short-circuited, the first resistor (R1) is short-circuited to pull down the voltage sampling signal (V1) of the first signal sampling terminal (421).

7. The charging circuit (100) according to claim 4, characterized in that When the second power output terminal (N-OUT) is short-circuited with the ground terminal (PE), the second resistor (R2) is short-circuited to pull down the voltage sampling signal (V2) of the second signal sampling terminal (422).

8. The charging circuit (100) according to claim 4, characterized in that When the first power output terminal (L-OUT) and the second power output terminal (N-OUT) are short-circuited, the first resistor (R1) and the second resistor (R2) are connected in parallel to change the voltage sampling signal (V1) of the first signal sampling terminal (421) and the voltage sampling signal (V2) of the second signal sampling terminal (422) to predetermined voltage values.

9. The charging circuit (100) according to claim 4, characterized in that When the first power output terminal (L-OUT), the second power output terminal (N-OUT), and the ground terminal (PE) are all short-circuited, the first resistor (R1) and the second resistor (R2) are short-circuited to pull down the voltage sampling signal (V1) of the first signal sampling terminal (421) and the voltage sampling signal (V2) of the second signal sampling terminal (422).

10. The charging circuit (100) according to any one of claims 1 to 9, characterized in that: The charging circuit (100) further includes a charging control module (50); the short-circuit detection module (40) includes a first transistor (Q1) and a first switch element (K1); the first transistor (Q1) is connected to the first switch element (K1); the first switch element (K1) is connected between the signal sampling terminal (42) and the power supply output terminal (20); and the charging control module (50) is respectively connected to the first transistor (Q1) and the signal sampling terminal (42); The charging control module (50) is used to output a first detection control signal to the first transistor (Q1) to turn on the first transistor (Q1), thereby turning on the first switch element (K1). The charging control module (50) is also used to obtain a voltage sampling signal from the signal sampling terminal (42) to determine whether a short circuit occurs between the output switch module (30) and the power supply output terminal (20) based on the voltage sampling signal.

11. The charging circuit (100) according to claim 10, characterized in that When no short circuit occurs between the output switch module (30) and the power output terminal (20), the charging control module (50) outputs a second detection control signal to the first transistor (Q1) to disconnect the first transistor (Q1), thereby disconnecting the first switch element (K1).

12. The charging circuit (100) according to claim 11, characterized in that The first transistor (Q1) is an NMOS transistor, the first detection control signal is a high-level signal, and the second detection control signal is a low-level signal.

13. The charging circuit (100) according to claim 10, characterized in that The output switch module (30) comprises a second transistor (Q2) and a second switch element (K2), the second transistor (Q2) is connected to the second switch element (K2), the second switch element (K2) is connected between the power input terminal (10) and the power output terminal (20), and the charging control module (50) is connected to the second transistor (Q2); When a short circuit occurs between the output switch module (30) and the power output terminal (20), the second switch element (K2) is disconnected; When no short circuit occurs between the output switch module (30) and the power output terminal (20), the charging control module (50) outputs a charging control signal to the second transistor (Q2), so that the second transistor (Q2) is turned on, and thus the second switch element (K2) is turned on.

14. The charging circuit (100) according to claim 13, characterized in that The second transistor (Q2) is an NMOS transistor, and the charging control signal is a high-level signal.

15. The charging circuit (100) according to claim 10, characterized in that The charging circuit (100) further comprises an auxiliary power supply module (60), the auxiliary power supply module (60) being connected to the charging control module (50) and the short-circuit detection module (40) respectively, and being used for providing a power supply voltage for the charging control module (50) and a detection voltage (V0) for the short-circuit detection module (40).

16. A charging connection device (1000), characterized in that: The charging circuit (100) comprises the charging circuit (100) according to any one of claims 1 to 15, wherein the charging circuit (100) is used to connect to a charging power source to charge a load (2000).

17. The charging connection device (1000) according to claim 16, characterized in that The charging connection device (1000) comprises a charging pile or a charging gun.

18. The charging connection device (1000) according to claim 16, characterized in that The load (2000) includes an energy storage battery of an electric vehicle.

19. A short circuit detection method, characterized in that: Applied to the charging circuit (100) according to any one of claims 1 to 15, the short-circuit detection method comprises: Acquiring a voltage sampling signal from the signal sampling terminal (42); Whether a short circuit occurs between the output switch module (30) and the power output terminal (20) is determined based on the voltage sampling signal.

20. The short circuit detection method according to claim 19, wherein: The determining whether a short circuit occurs between the output switch module (30) and the power output terminal (20) based on the voltage sampling signal comprises: According to the voltage sampling signal (V1) of the first signal sampling terminal (421) being pulled low, it is determined that the first power output terminal (L-OUT) and the ground terminal (PE) are short-circuited; According to the voltage sampling signal (V2) of the second signal sampling terminal (422) being pulled low, it is determined that the second power supply output terminal (N-OUT) and the ground terminal (PE) are short-circuited; Determining that the first power supply output terminal (L-OUT) and the second power supply output terminal (N-OUT) are short-circuited based on the voltage sampling signal (V1) of the first signal sampling terminal (421) and the voltage sampling signal (V2) of the second signal sampling terminal (422) changing to predetermined voltage values; According to the voltage sampling signal (V1) of the first signal sampling terminal (421) and the voltage sampling signal (V2) of the second signal sampling terminal (422) being pulled low, it is determined that the first power output terminal (L-OUT), the second power output terminal (N-OUT) and the ground terminal (PE) are all short-circuited.

21. The short circuit detection method according to claim 19, wherein: The short circuit detection method further includes: When a short circuit occurs between the output switch module (30) and the power supply output terminal (20), the output switch module (30) is controlled to be disconnected.

22. A short circuit detection device (200), characterized in that: Applied to the charging circuit (100) according to any one of claims 1 to 15, the short-circuit detection device (200) comprises: An acquisition module (210) is used to acquire a voltage sampling signal from the signal sampling terminal (42); A determination module (220) is used to determine whether a short circuit occurs between the output switch module (30) and the power supply output terminal (20) based on the voltage sampling signal.

23. A short circuit detection system (300), characterized in that: The short circuit detection system (300) includes one or more processors (310) and a memory (320), wherein the memory (320) stores a computer program, and when the computer program is executed by the processor (310), the short circuit detection method according to any one of claims 19 to 21 is implemented.

24. A computer-readable storage medium (400) having a computer program (410) stored thereon, characterized in that: When the program is executed by the processor (420), the short circuit detection method according to any one of claims 19 to 21 is implemented.

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