Magnetic modulation module, electric leakage detection protection device and charging device

Abstract

The invention provides a magnetic modulation module with an online self-checking function. The magnetic modulation module comprises: a magnetic core wound with a coil; the control unit is used for controlling the excitation output unit to apply a first excitation voltage signal to the coil through the excitation adjustment unit in a monitoring mode and detecting a voltage signal on the coil so as to realize electric leakage detection, and controlling the excitation output unit to apply a second excitation voltage signal to the coil through the excitation adjustment unit in a first on-line self-inspection mode; in the first on-line self-inspection mode, the excitation output unit is controlled by the excitation adjusting unit to apply a second excitation voltage signal to the coil, the effectiveness of the self magnetic modulation function is detected based on the voltage signal actually applied to the coil, and in the second on-line self-inspection mode, the excitation output unit is controlled by the excitation adjusting unit to apply a third excitation voltage signal to the coil. And the effectiveness of the circuit breaking trigger function is detected according to whether the circuit breaker outputs a circuit breaking control signal or not. According to the invention, the problem that the function effectiveness of a magnetic modulation module cannot be guaranteed because the magnetic modulation module does not have an on-line self-checking function in the prior art can be solved.

Description

Technical Field

[0001] The present invention belongs to the field of leakage detection, and more specifically, relates to a magnetic modulation module with an online self-checking function, a leakage detection protection device including the magnetic modulation module, and a charging device including the leakage detection protection device. Background Art

[0002] In the related art, a type of magnetic modulation module based on the fluxgate principle is used to detect leakage current. This type of magnetic modulation module mainly includes a magnetic core with a coil wound thereon, an excitation output unit, a voltage comparison unit and a control unit. Among them, the control unit is used to control the excitation output unit to apply an excitation voltage to the coil to generate an excitation magnetic field. Under the action of the excitation magnetic field, the magnetic core continuously changes between positive and negative saturation states to form a fluxgate. When there is no leakage current on the measured circuit, there is no interfering magnetic field in the space where the fluxgate is located, and the actual voltage on the coil is the same as the excitation voltage applied to it by the excitation output unit. At this time, the voltage comparison unit used to compare the actual voltage and the excitation voltage will not feedback the voltage difference value to the control unit. When there is leakage current on the measured line, the magnetic field generated by the leakage current will affect the excitation magnetic field, and then affect the magnetic flux of the flux gate. At this time, the actual voltage on the coil is different from the excitation voltage applied to it by the excitation output unit. The voltage comparison unit feeds back the voltage difference between the two to the control unit. If it is detected that the voltage difference reaches the predetermined voltage difference setting value, the control unit controls the circuit breaker on the measured line to perform a circuit breaking operation to achieve leakage protection.

[0003] However, although the above magnetic modulation module is increasingly used in leakage detection protection due to its advantages of simple structure and high sensitivity, the above magnetic modulation module has the problem that its own functional effectiveness cannot be guaranteed because it does not have the following two online self-test functions:

[0004] 1. Online self-test of its own magnetic modulation function:

[0005] The magnetic modulation function refers to the control unit controlling the excitation output unit to apply a magnetic field to the magnetic core. If the magnetic modulation function is invalid, the magnetic core will not be able to detect the presence of leakage current. However, for the above-mentioned magnetic modulation module, when its own magnetic modulation function is normal and there is no leakage current on the measured circuit, the voltage comparison unit will not feedback the voltage difference value to the control unit. If a short circuit occurs inside the above-mentioned magnetic modulation module and a magnetic field cannot be applied to the magnetic core, the voltage comparison unit will also not feedback the voltage difference value to the control unit. It can be seen from this that the above-mentioned magnetic modulation module does not have an online self-test function for magnetic modulation, and cannot perform regular online self-tests of the magnetic modulation function after being put into use.

[0006] 2. Online self-test of its own circuit breaker triggering function:

[0007] For the above magnetic modulation module, its circuit breaking trigger function will be triggered only when there is leakage current on the measured line and the corresponding voltage difference value reaches the voltage difference value setting value. Therefore, the above magnetic modulation module does not have the circuit breaking trigger online self-check function, and cannot perform the circuit breaking trigger function online self-check regularly after being put into use.

[0008] Based on the above description, it is necessary to propose a magnetic modulation module with corresponding online self-test function. Summary of the invention

[0009] The purpose of the present invention is to solve the problem in the related art that the magnetic modulation module does not have the magnetic modulation online self-checking function and the circuit breaking triggering online self-checking function, so that the effectiveness of its own function cannot be guaranteed.

[0010] In order to achieve the above-mentioned object, the present invention provides a magnetic modulation module with an online self-checking function, a leakage detection protection device and a charging device.

[0011] According to a first aspect of the present invention, there is provided a magnetic modulation module with an online self-test function, the magnetic modulation module comprising:

[0012] A magnetic core, on which a coil is wound, the coil serving as both an excitation coil and a measurement coil;

[0013] Excitation output unit;

[0014] Incentive adjustment unit;

[0015] a control unit, configured to control the excitation output unit to apply a first excitation voltage signal to the coil through the excitation adjustment unit and detect the voltage signal on the coil to implement leakage detection when in a monitoring mode,

[0016] When in the first online self-test mode, the excitation adjustment unit controls the excitation output unit to apply a second excitation voltage signal to the coil, and detects the effectiveness of its own magnetic modulation function based on the voltage signal actually applied to the coil.

[0017] Furthermore, when in the second online self-test mode, the excitation adjustment unit controls the excitation output unit to apply a third excitation voltage signal to the coil, and detects the effectiveness of its own circuit breaking trigger function based on whether it outputs a circuit breaking control signal to the outside.

[0018] Optionally, the magnetic core is a closed type magnetic core or a non-closed type magnetic core.

[0019] Optionally, the first excitation voltage signal is a first square wave signal having a first duty cycle, the second excitation voltage signal is a second square wave signal having a second duty cycle, and the third excitation voltage signal is a third square wave signal having a third duty cycle;

[0020] The first duty cycle is 50%, the second duty cycle is greater than 50% and less than a predetermined duty cycle threshold, and the third duty cycle is greater than 50% and not less than the duty cycle threshold.

[0021] Optionally, the magnetic modulation module further includes a sampling resistor;

[0022] The excitation output unit is an operational amplifier, the output end of the operational amplifier is connected to the first end of the coil, and the inverting input end of the operational amplifier and the second end of the coil are both connected to the reference potential end through the sampling resistor;

[0023] The control unit adjusts the input signal of the non-inverting input terminal of the operational amplifier through the excitation adjustment unit to apply the first excitation voltage signal, the second excitation voltage signal or the third excitation voltage signal to the coil;

[0024] The first end of the coil is a feedback voltage output end.

[0025] Optionally, the excitation adjustment unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first PMOS transistor, a second PMOS transistor, a first NMOS transistor, and a second NMOS transistor;

[0026] The gate of the first PMOS tube is connected to the first driving end of the control unit, the gate of the first NMOS tube is connected to the second driving end of the control unit, and the drain of the first PMOS tube and the drain of the first NMOS tube are both connected to the first end of the third resistor;

[0027] The gate of the second PMOS tube is connected to the third driving terminal of the control unit, the gate of the second NMOS tube is connected to the fourth driving terminal of the control unit, and the drain of the second PMOS tube and the drain of the second NMOS tube are both connected to the first end of the fourth resistor;

[0028] The source of the first PMOS tube and the source of the second PMOS tube are both connected to the VCC terminal, and the source of the first NMOS tube and the source of the second NMOS tube are both connected to the -VCC terminal;

[0029] The first end of the first resistor is connected to the first end of the fifth resistor and the first end of the coil at the same time, and the second end of the fifth resistor is connected to the first end of the sixth resistor and the feedback voltage input end of the control unit at the same time;

[0030] A common end of the second end of the third resistor, the second end of the fourth resistor, the second end of the first resistor and the first end of the second resistor is connected to the non-inverting input end of the operational amplifier;

[0031] The second end of the sixth resistor and the second end of the second resistor are both connected to the reference potential terminal.

[0032] Optionally, when in the monitoring mode, the control unit controls the first PMOS tube, the first NMOS tube, the second PMOS tube and the second NMOS tube to be turned on.

[0033] Optionally, when in the first online self-test mode, the control unit controls the first PMOS tube to be turned on, and controls the first NMOS tube, the second PMOS tube and the second NMOS tube to be turned off.

[0034] Optionally, when in the second online self-test mode, the control unit controls the second PMOS tube to be turned on, and controls the first PMOS tube, the first NMOS tube and the second NMOS tube to be turned off.

[0035] According to a second aspect of the present invention, there is provided a leakage detection protection device, the leakage detection protection device comprising:

[0036] Any of the above magnetic modulation modules;

[0037] The circuit breaking actuator is used to perform circuit breaking processing on the corresponding leakage circuit in response to the circuit breaking control signal output by the magnetic modulation module.

[0038] According to a third aspect of the present invention, there is provided a device for providing charging, the device for providing charging comprising the above-mentioned leakage detection and protection device.

[0039] The beneficial effects of the present invention are:

[0040] The magnetic modulation module of the present invention comprises a magnetic core on which a coil is wound, an excitation output unit, an excitation adjustment unit and a control unit. Among them, the control unit has three working modes, namely, a monitoring mode, a first online self-test mode and a second online self-test mode. When in the monitoring mode, the control unit controls the excitation output unit through the excitation adjustment unit to apply a first excitation voltage signal to the coil, so that the magnetic core forms a flux gate, and the actual voltage on the coil is detected in real time, thereby realizing leakage detection and protection. When in the first online self-test mode, the control unit controls the excitation output unit through the excitation adjustment unit to apply a second excitation voltage signal to the coil. At this time, the control unit detects whether the actual voltage on the coil is converted into the second excitation voltage signal. If so, it proves that its own magnetic modulation function is effective. When in the second online self-test mode, the control unit controls the excitation output unit through the excitation adjustment unit to apply a third excitation voltage signal to the coil for triggering its own circuit breaking trigger function. When the control unit detects that the actual voltage on the coil is converted into the third excitation voltage signal, if it sends a circuit breaking control signal to the corresponding circuit breaking actuator, it proves that its own circuit breaking trigger function is effective.

[0041] According to the above content, compared with the magnetic modulation module in the related art, the magnetic modulation module of the present invention not only has the leakage detection and protection functions, but also has the functions of detecting the effectiveness of its own magnetic modulation function and detecting the effectiveness of its own circuit breaking trigger function. Due to the online self-checking functions of these two aspects, the magnetic modulation module of the present invention has a higher reliability, and can effectively solve the problem that the magnetic modulation module in the related art cannot ensure the effectiveness of its own functions because it does not have the online self-checking function of magnetic modulation and the online self-checking function of circuit breaking trigger.

[0042] The leakage detection protection device and the charging device of the present invention belong to a general inventive concept with the above-mentioned magnetic modulation module, and have at least the same beneficial effects as the above-mentioned magnetic modulation module, and their beneficial effects are not repeated here.

[0043] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention may be better understood by referring to the following description taken in conjunction with the accompanying drawings, in which the same or similar reference numerals are used throughout the drawings to represent the same or similar components.

[0045] Figure 1 A principle block diagram of a magnetic modulation module with an online self-checking function according to an embodiment of the present invention is shown;

[0046] Figure 2A circuit diagram of a magnetic modulation module with an online self-test function according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to more fully understand the technical solution of the present invention, the exemplary embodiments of the present invention will be described in more comprehensive and detailed in conjunction with the accompanying drawings below. Obviously, the one or more embodiments of the present invention described below are only one or more of the specific ways in which the technical solution of the present invention can be implemented, and are not exhaustive. It should be understood that other ways belonging to a general inventive concept can be used to implement the technical solution of the present invention, and should not be limited by the exemplary embodiments described. Based on one or more embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of the present invention.

[0048] Example: Figure 1 FIG. 1 shows a principle block diagram of a magnetic modulation module with an online self-checking function according to an embodiment of the present invention. Figure 1 , the magnetic modulation module with online self-test function of the embodiment of the present invention comprises:

[0049] A magnetic core, on which a coil is wound, the coil serving as both an excitation coil and a measurement coil;

[0050] Excitation output unit;

[0051] Incentive adjustment unit;

[0052] The control unit is used to control the excitation output unit to apply a first excitation voltage signal to the coil through the excitation adjustment unit when in the monitoring mode, and detect the voltage signal on the coil to realize leakage detection,

[0053] When in the first online self-test mode, the excitation output unit is controlled by the excitation adjustment unit to apply a second excitation voltage signal to the coil, and the effectiveness of the magnetic modulation function thereof is detected based on the voltage signal actually applied to the coil.

[0054] And, when in the second online self-test mode, the excitation adjustment unit controls the excitation output unit to apply a third excitation voltage signal to the coil, and detects the effectiveness of its own circuit breaking trigger function based on whether it outputs a circuit breaking control signal to the outside.

[0055] Furthermore, in an embodiment of the present invention, the magnetic core is a closed type magnetic core or a non-closed type magnetic core.

[0056] Furthermore, in an embodiment of the present invention, the first excitation voltage signal is a first square wave signal having a first duty cycle, the second excitation voltage signal is a second square wave signal having a second duty cycle, and the third excitation voltage signal is a third square wave signal having a third duty cycle;

[0057] The first duty cycle is 50%, the second duty cycle is greater than 50% and less than a predetermined second duty cycle threshold, and the third duty cycle is greater than 50% and not less than the predetermined second duty cycle threshold.

[0058] Specifically, in an embodiment of the present invention, when in monitoring mode, the control unit controls the excitation output unit through the excitation adjustment unit to apply a first square wave signal with a duty cycle of 50% to the coil to generate an excitation magnetic field, thereby causing the magnetic core to form a fluxgate. In the subsequent monitoring process, the control unit detects the actual voltage signal on the coil in real time. When the leakage current on the measured circuit flows in the first direction, the duty cycle of the actual voltage signal on the coil will decrease from 50%. If the control unit detects that the duty cycle of the actual voltage signal decreases to the first duty cycle threshold, it is determined that there is a leakage current flowing in the first direction on the measured circuit. When the leakage current on the measured circuit flows in a second direction opposite to the first direction, the duty cycle of the actual voltage signal on the coil will increase from 50%. If the control unit detects that the duty cycle of the actual voltage signal increases to the second duty cycle threshold, it is determined that there is a leakage current flowing in the second direction on the measured circuit.

[0059] Specifically, in the embodiment of the present invention, when in the first online self-test mode, the control unit controls the excitation output unit through the excitation adjustment unit to apply a second square wave signal with a duty cycle greater than 50% and less than the second duty cycle threshold to the coil. If the control unit detects that the actual voltage signal on the coil is the second square wave signal, it proves that the magnetic modulation function is effective. Since the duty cycle of the second square wave signal is less than the second duty cycle threshold, when the control unit detects that the actual voltage signal on the coil is the second square wave signal, the circuit breaker trigger function will not be executed, thereby enabling all-weather online self-test of the magnetic modulation function based on the first online self-test mode.

[0060] Specifically, in the embodiment of the present invention, when in the second online self-checking mode, the control unit controls the excitation output unit through the excitation adjustment unit to apply a third wave signal with a duty cycle greater than 50% and at least equal to the second duty cycle threshold to the coil. If the control unit detects that the actual voltage signal on the coil is a third wave signal, it will trigger its own circuit breaking trigger function. At this time, if the control unit sends a circuit breaking control signal to the corresponding circuit breaking actuator, it proves that the circuit breaking trigger function is effective. Based on the second online self-checking mode, regular online self-checking of the circuit breaking trigger function can be achieved.

[0061] Further, Figure 2FIG. 1 is a circuit diagram of a magnetic modulation module with an online self-test function according to an embodiment of the present invention. Figure 2 , the magnetic modulation module with online self-test function of the embodiment of the present invention further includes a sampling resistor R0;

[0062] The excitation output unit is an operational amplifier OP1, the output end of the operational amplifier OP1 is connected to the first end of the coil L1, and the inverting input end of the operational amplifier OP1 and the second end of the coil L1 are both connected to the reference potential end through the sampling resistor R0;

[0063] The control unit MCU adjusts the input signal of the non-inverting input terminal of the operational amplifier OP1 through the excitation adjustment unit to apply the first excitation voltage signal, the second excitation voltage signal or the third excitation voltage signal to the coil L1;

[0064] The first end of the coil L1 is a feedback voltage output end.

[0065] Furthermore, in the embodiment of the present invention, the excitation adjustment unit includes 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 first PMOS transistor M1, a second PMOS transistor M2, a first NMOS transistor M3, and a second NMOS transistor M4;

[0066] The gate of the first PMOS tube M1 is connected to the first driving terminal DO1 of the control unit MCU, the gate of the first NMOS tube M3 is connected to the second driving terminal DO2 of the control unit MCU, and the drain of the first PMOS tube M1 and the drain of the first NMOS tube M3 are both connected to the first end of the third resistor R3;

[0067] The gate of the second PMOS tube M2 is connected to the third driving terminal DO3 of the control unit MCU, the gate of the second NMOS tube M4 is connected to the fourth driving terminal DO4 of the control unit MCU, and the drain of the second PMOS tube M2 and the drain of the second NMOS tube M4 are both connected to the first end of the fourth resistor R4;

[0068] The source of the first PMOS tube M1 and the source of the second PMOS tube M2 are both connected to the VCC terminal, and the source of the first NMOS tube M3 and the source of the second NMOS tube M4 are both connected to the -VCC terminal;

[0069] The first end of the first resistor R1 is connected to the first end of the fifth resistor R5 and the first end of the coil L1, and the second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6 and the feedback voltage input terminal DI of the control unit MCU;

[0070] A common end of the second end of the third resistor R3, the second end of the fourth resistor R4, the second end of the first resistor R1 and the first end of the second resistor R2 is connected to the non-inverting input end of the operational amplifier OP1;

[0071] The second end of the sixth resistor R6 and the second end of the second resistor R2 are both connected to the reference potential terminal.

[0072] Furthermore, in the embodiment of the present invention, when in the monitoring mode, the control unit MCU controls the first PMOS transistor M1, the first NMOS transistor M3, the second PMOS transistor M2 and the second NMOS transistor M4 to be turned on.

[0073] Furthermore, in the embodiment of the present invention, when in the first online self-test mode, the control unit MCU controls the first PMOS tube M1 to be turned on, and controls the first NMOS tube M3, the second PMOS tube M2 and the second NMOS tube M4 to be turned off.

[0074] Furthermore, in the embodiment of the present invention, when in the second online self-test mode, the control unit MCU controls the second PMOS tube M2 to be turned on, and controls the first PMOS tube M1, the first NMOS tube M3 and the second NMOS tube M4 to be turned off.

[0075] The following is based on Figure 2 The working principle of the magnetic modulation module with online self-test function according to the embodiment of the present invention is described in more detail:

[0076] The excitation output unit is an operational amplifier OP1; the excitation adjustment unit includes a resistor voltage divider network composed of a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, and a level conversion circuit composed of a fifth resistor R5, a sixth resistor R6, a first PMOS tube M1, a second PMOS tube M2, a first NMOS tube M3 and a second NMOS tube M4; wherein the third resistor R3, the first PMOS tube M1 and the first NMOS tube M3 form a weak test circuit, and the fourth resistor R4, the second PMOS tube M2 and the second NMOS tube M4 form a strong test circuit.

[0077] When the control unit MCU sets both the weak test circuit and the strong test circuit to open-drain output:

[0078] The voltage of the output VP1 of the excitation adjustment unit is defined by the first resistor R1 and the second resistor R2. Assuming that the output of the operational amplifier OP1 is close to the VCC signal, the voltage of the output VP1 of the excitation adjustment unit is VCC*R2 / (R1+R2);

[0079] As the current ic of the coil L1 gradually increases, the coil L1 will tend to the forward saturation state. When the inverting input VF1 of the operational amplifier OP1 is greater than the output VP1 of the excitation adjustment unit, the output signal of the operational amplifier OP1 will flip and output a signal close to -VCC.

[0080] When the output signal of the operational amplifier OP1 is close to the -VCC signal, the voltage of the output VP1 of the excitation adjustment unit is -VCC*R2 / (R1+R2). As the current -ic of the coil L1 gradually increases, the coil L1 will tend to the reverse saturation state. When the inverting input VF1 of the operational amplifier OP1 is greater than the output VP1 of the excitation adjustment unit, the output signal of the operational amplifier OP1 will flip and output close to the VCC signal.

[0081] The output signal of the operational amplifier OP1 is repeatedly flipped in the above manner to form a modulated excitation signal with a duty cycle of 50% and a frequency of X Hz, that is, a first excitation voltage signal.

[0082] When the control unit MCU detects the output VCC signal of the operational amplifier OP1, the weak test circuit is set to push-pull output VCC signal, and the strong test circuit is set to open-drain output:

[0083] At this time, the voltage of the output VP1 of the excitation adjustment unit is jointly defined by the first resistor R1, the second resistor R2 and the third resistor R3;

[0084] Assuming that the output of the operational amplifier OP1 is close to the VCC signal, the voltage of the output VP1 of the excitation adjustment unit is VCC*(R2 / / R3) / (R1+R2 / / R3);

[0085] As the current ic of the coil L1 gradually increases, the coil L1 will tend to the forward saturation state. When the inverting input VF1 of the operational amplifier OP1 is greater than the output VP1 of the excitation adjustment unit, the output signal of the operational amplifier OP1 will flip and output a signal close to -VCC.

[0086] When the output signal of the operational amplifier OP1 is flipped and the output is close to the -VCC signal, the voltage of the output VP1 of the excitation adjustment unit is -VCC*R2 / (R1+R2);

[0087] Since the output VP1 of the excitation adjustment unit is different when the operational amplifier OP1 outputs a signal close to VCC and when the operational amplifier OP1 outputs a signal close to -VCC, the flip voltage VP1 of the inverting input VF1 of the operational amplifier OP1 is also different when the operational amplifier OP1 outputs a signal close to VCC and when the operational amplifier OP1 outputs a signal close to -VCC;

[0088] Since the flip voltage VP1 corresponding to the inverting input VF1 of the operational amplifier OP1 is different, the duty cycle of the excitation voltage signal applied to the coil L1 is no longer 50%, for example, it is 50.1%. At this time, the control unit MCU detects a slight change in the duty cycle, and then determines the effectiveness of its own function of applying the excitation voltage, that is, the effectiveness of its own magnetic modulation function.

[0089] When the control unit MCU detects the output VCC signal of the operational amplifier OP1, the weak test circuit is set to open-drain output, and the strong test circuit is set to push-pull output VCC signal:

[0090] At this time, the voltage of the output VP1 of the excitation adjustment unit is jointly defined by the first resistor R1, the second resistor R2 and the fourth resistor R4;

[0091] Assuming that the output of the operational amplifier OP1 is close to the VCC signal, the voltage of the output VP1 of the excitation adjustment unit is VCC*(R2 / / R4) / (R1+R2 / / R4);

[0092] As the current ic of the coil L1 gradually increases, the coil L1 will tend to the forward saturation state. When the inverting input VF1 of the operational amplifier OP1 is greater than the output VP1 of the excitation adjustment unit, the output signal of the operational amplifier OP1 will flip and output a signal close to -VCC.

[0093] When the output signal of the operational amplifier OP1 is flipped and the output is close to the -VCC signal, the voltage of the output VP1 of the excitation adjustment unit is -VCC*R2 / (R1+R2);

[0094] Since the output VP1 of the excitation adjustment unit is different when the operational amplifier OP1 outputs a signal close to VCC and when the operational amplifier OP1 outputs a signal close to -VCC, the flip voltage VP1 of the inverting input VF1 of the operational amplifier OP1 is also different when the operational amplifier OP1 outputs a signal close to VCC and when the operational amplifier OP1 outputs a signal close to -VCC;

[0095] Since the flip voltage VP1 corresponding to the inverting input VF1 of the operational amplifier OP1 is different, and R4 is set to be smaller than R3, the duty cycle of the excitation voltage signal applied to the coil L1 is no longer 50%, for example 60%. At this time, the control unit MCU detects a large change in the duty cycle and then takes action, that is, outputs a circuit breaker control signal.

[0096] Correspondingly, based on the magnetic modulation module proposed in the embodiment of the present invention, the embodiment of the present invention also proposes a leakage detection protection device, which includes the above-mentioned magnetic modulation module and a circuit breaking actuator, wherein the circuit breaking actuator is used to perform circuit breaking processing on the corresponding leakage line in response to the circuit breaking control signal output by the magnetic modulation module.

[0097] Correspondingly, based on the leakage detection protection device proposed in the embodiment of the present invention, the embodiment of the present invention further proposes a device for providing charging, and the device for providing charging includes the above-mentioned leakage detection protection device.

[0098] Specifically, the device for providing charging according to the embodiment of the present invention is a device for providing charging for electric vehicles.

[0099] Although one or more embodiments of the present invention are described above, it should be known to those skilled in the art that the present invention can be implemented in any other form without departing from its subject matter and scope. Therefore, the embodiments described above are illustrative rather than restrictive, and many modifications and substitutions are obvious to those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A magnetic modulation module with online self-test function, characterized in that: include: A magnetic core, on which a coil is wound, the coil serving as both an excitation coil and a measurement coil; Excitation output unit; Incentive adjustment unit; a control unit, configured to control the excitation output unit to apply a first excitation voltage signal to the coil through the excitation adjustment unit and detect the voltage signal on the coil to implement leakage detection when in a monitoring mode, When in the first online self-test mode, the excitation adjustment unit controls the excitation output unit to apply a second excitation voltage signal to the coil, and detects the effectiveness of its own magnetic modulation function based on the voltage signal actually applied to the coil. Furthermore, when in the second online self-test mode, the excitation adjustment unit controls the excitation output unit to apply a third excitation voltage signal to the coil, and detects the effectiveness of its own circuit breaking trigger function based on whether it outputs a circuit breaking control signal to the outside.

2. The magnetic modulation module with online self-test function according to claim 1, characterized in that: The magnetic core is a closed type magnetic core or a non-closed type magnetic core.

3. The magnetic modulation module with online self-test function according to claim 1, characterized in that: The first excitation voltage signal is a first square wave signal having a first duty cycle, the second excitation voltage signal is a second square wave signal having a second duty cycle, and the third excitation voltage signal is a third square wave signal having a third duty cycle; The first duty cycle is 50%, the second duty cycle is greater than 50% and less than a predetermined duty cycle threshold, and the third duty cycle is greater than 50% and not less than the duty cycle threshold.

4. The magnetic modulation module with online self-test function according to claim 1, characterized in that: It also includes a sampling resistor; The excitation output unit is an operational amplifier, the output end of the operational amplifier is connected to the first end of the coil, and the inverting input end of the operational amplifier and the second end of the coil are both connected to the reference potential end through the sampling resistor; The control unit adjusts the input signal of the non-inverting input terminal of the operational amplifier through the excitation adjustment unit to apply the first excitation voltage signal, the second excitation voltage signal or the third excitation voltage signal to the coil; The first end of the coil is a feedback voltage output end.

5. The magnetic modulation module with online self-checking function according to claim 4, characterized in that: The excitation adjustment unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first PMOS transistor, a second PMOS transistor, a first NMOS transistor and a second NMOS transistor; The gate of the first PMOS tube is connected to the first driving end of the control unit, the gate of the first NMOS tube is connected to the second driving end of the control unit, and the drain of the first PMOS tube and the drain of the first NMOS tube are both connected to the first end of the third resistor; The gate of the second PMOS tube is connected to the third driving terminal of the control unit, the gate of the second NMOS tube is connected to the fourth driving terminal of the control unit, and the drain of the second PMOS tube and the drain of the second NMOS tube are both connected to the first end of the fourth resistor; The source of the first PMOS tube and the source of the second PMOS tube are both connected to the VCC terminal, and the source of the first NMOS tube and the source of the second NMOS tube are both connected to the -VCC terminal; The first end of the first resistor is connected to the first end of the fifth resistor and the first end of the coil at the same time, and the second end of the fifth resistor is connected to the first end of the sixth resistor and the feedback voltage input end of the control unit at the same time; A common end of the second end of the third resistor, the second end of the fourth resistor, the second end of the first resistor and the first end of the second resistor is connected to the non-inverting input end of the operational amplifier; The second end of the sixth resistor and the second end of the second resistor are both connected to the reference potential terminal.

6. The magnetic modulation module with online self-checking function according to claim 5, characterized in that: When in the monitoring mode, the control unit controls the first PMOS transistor, the first NMOS transistor, the second PMOS transistor and the second NMOS transistor to be turned on.

7. The magnetic modulation module with online self-test function according to claim 5, characterized in that: When in the first online self-test mode, the control unit controls the first PMOS tube to be turned on, and controls the first NMOS tube, the second PMOS tube and the second NMOS tube to be turned off.

8. The magnetic modulation module with online self-test function according to claim 5, characterized in that: When in the second online self-test mode, the control unit controls the second PMOS tube to be turned on, and controls the first PMOS tube, the first NMOS tube and the second NMOS tube to be turned off.

9. A leakage detection protection device, characterized in that: include: The magnetic modulation module with online self-test function according to any one of claims 1 to 8; The circuit breaking actuator is used to perform circuit breaking processing on the corresponding leakage circuit in response to the circuit breaking control signal output by the magnetic modulation module.

10. A device for providing charging, characterized in that: Including the leakage detection protection device as described in claim 9.

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