A B-type leakage circuit with electromagnetic and electronic types

Abstract

The present invention relates to a B-type leakage circuit with electromagnetic and electronic types, characterized in that it comprises: a power supply circuit, a switching power supply, a 5V voltage stabilizing circuit, an NMOS switching circuit, and an electromagnetic leakage detection circuit which are electrically connected in sequence, wherein the electromagnetic leakage detection circuit is also electrically connected to an electromagnetic zero-sequence current transformer and an electromagnetic leakage tripping driving circuit respectively, wherein the electromagnetic leakage tripping driving circuit is electrically connected to an electromagnetic leakage tripper, wherein the electromagnetic leakage tripper is electrically connected to an electronic leakage tripping driving circuit, wherein the electronic leakage tripping driving circuit is electrically connected to an electronic leakage detection circuit, wherein the electronic leakage detection circuit is electrically connected to a B-type leakage detection module, wherein the B-type leakage detection module is electrically connected to an electronic zero-sequence current transformer. When the power supply voltage is greater than 50V, the electronic leakage protection function is provided, and when the power supply voltage is lower than 50V, the electromagnetic leakage protection function is provided; the advantages of electronic and electromagnetic leakage are combined.

Description

Technical Field

[0001] The present invention relates to the technical field of leakage circuit breakers, and more specifically to a B-type leakage circuit with electromagnetic and electronic modes. When the circuit voltage cannot drive the electronic module to trip, the electromagnetic mode can still play a partial protection function (A / AC). Background Art

[0002] The existing residual current operated circuit breakers (referred to as residual current circuit breakers) are divided into AC type residual current circuit breakers, A type residual current circuit breakers, and B type residual current circuit breakers according to the residual current operating characteristics. The AC type residual current circuit breaker protects against sinusoidal AC residual current, the A type residual current circuit breaker protects against sinusoidal AC and pulsating DC residual current, and the B type residual current circuit breaker protects against sinusoidal AC, pulsating DC, and smooth DC residual current.

[0003] At present, most of the B-type leakage circuit breakers are electronic leakage, and the electronic sequence current transformer is used alone to detect the leakage current of the circuit. The B-type leakage process with electromagnetic and electronic coexistence has high precision and is difficult to verify. The electromagnetic type often has a leakage range that exceeds the specified requirements, but the electromagnetic leakage protection is independent of the power supply voltage. The electronic leakage has high precision, but its leakage protection is related to the power supply voltage. When the power supply has no voltage or low voltage, the leakage protection does not work.

[0004] Therefore, the prior art is in urgent need of great progress. Summary of the invention

[0005] The technical problem to be solved by the present invention is that, in view of the above-mentioned defects of the prior art, a B-type leakage circuit with electromagnetic and electronic types is provided, comprising: a power supply circuit, a switching power supply, a 5V voltage stabilizing circuit, an NMOS switching circuit, and an electromagnetic leakage detection circuit which are electrically connected in sequence, wherein the electromagnetic leakage detection circuit is also electrically connected to an electromagnetic zero-sequence current transformer and an electromagnetic leakage tripping drive circuit respectively, the electromagnetic leakage tripping drive circuit is electrically connected to an electromagnetic leakage releaser, the electromagnetic leakage releaser is electrically connected to an electronic leakage tripping drive circuit, the electronic leakage tripping drive circuit is electrically connected to an electronic leakage detection circuit, the electronic leakage detection circuit is electrically connected to a B-type leakage detection module, and the B-type leakage detection module is electrically connected to an electronic zero-sequence current transformer.

[0006] In the electromagnetic and electronic type B leakage circuit described in the present invention, the switching power supply includes capacitors C7, C10, C3, diodes D8, D9, resistors R2, R8, inductor L2, and integrated circuit U1; the cathode of capacitor C7 and the anode of diode D9 are grounded, the anode of capacitor C7 is connected to the D pin of integrated circuit U1, the FB pin of integrated circuit U1 is respectively connected to one end of resistor R8 and one end of resistor R2, the BP pin of integrated circuit U1 is connected to one end of capacitor C10, the other end of capacitor C10 is respectively connected to the S pin of integrated circuit U1, the cathode of diode D9, the other end of resistor R8, one end of capacitor C3, and one end of inductor L2, the cathode of diode D9 is connected to the S pin of integrated circuit U1, the other end of resistor R2 is respectively connected to the other end of capacitor C3 and the anode of diode D8, and the cathode of diode D8 is connected to the other end of inductor L2.

[0007] In the electromagnetic and electronic B-type leakage circuit of the present invention, the 5V voltage stabilizing circuit includes a voltage stabilizing integrated circuit U2.

[0008] In the electromagnetic and electronic B-type leakage circuit of the present invention, the NMOS switch circuit includes a resistor R3 and an NMOS transistor Q1 , and a gate G of the NMOS transistor Q1 is connected in series with the resistor R3 .

[0009] In the electromagnetic and electronic type B leakage circuit described in the present invention, the electronic leakage tripping drive circuit includes resistors R11, R7, R4, R5, R6, transistors Q2, Q3, and a diode D11; one end of the resistor R11 is respectively connected to one end of the resistor R7 and one end of the resistor R4, the other end of the resistor R7 is grounded, the other end of the resistor R4 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is respectively connected to one end of the resistor R5 and the base of the transistor Q3, the collector of the transistor Q3 is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to the positive electrode of the diode D11.

[0010] In the electromagnetic and electronic B-type leakage circuit described in the present invention, the electromagnetic leakage tripping drive circuit includes an NMOS switch circuit, diodes D12 and D13, capacitors C2 and C5, and wiring ports J7 and J8. The positive electrode of the diode D12 is respectively connected to the negative electrode of the diode D13, the drain electrode D of the NMOS tube Q1, and the positive electrode of the capacitor C2. The negative electrode of the diode D12 is respectively connected to the positive electrode of the diode D13, the source electrode S of the NMOS tube Q1, and the positive electrode of the capacitor C5 and is grounded. The negative electrode of the diode D12 is led out of the wiring port J8, the positive electrode of the diode D12 is led out of the wiring port J7, and the negative electrode of the capacitor C2 is connected to the negative electrode of the capacitor C5.

[0011] In the electromagnetic and electronic B-type leakage circuit of the present invention, the B-type leakage detection module includes an integrated circuit U3.

[0012] In the electromagnetic and electronic type B leakage circuit described in the present invention, the power supply circuit includes varistors RV1, RV2, RV3, wiring ports J1, J2, J3, J4, diodes D1, D2, D3, D4, D5, D6, resistors R20, R21, one end of the varistor RV1 is led out of the wiring port J1 and connected to the positive electrode of the diode D1, the other end of the varistor RV1 is respectively connected to one end of the varistor RV2, one end of the varistor RV3, and one end of the varistor RV4, the other end of the varistor RV4 is led out of the wiring port J4 and grounded, and the varistor The other end of resistor RV2 is led out of the wiring port J2 and connected to the anode of diode D3, the cathode of diode D3 is connected to the anode of diode D4, the cathode of diode D1 is connected to the anode of diode D2, the cathode of diode D3 is connected to the anode of diode D4, the cathode of diode D5 is connected to the anode of diode D6, the cathode of diode D2, the cathode of diode D4, and the cathode of diode D6 are connected and connected to one end of resistor R20, the other end of resistor R20 is connected to one end of resistor R21, and the other end of varistor RV3 is led out of the wiring port J3 and connected to the anode of diode D5.

[0013] The electromagnetic and electronic B-type leakage circuit of the present invention has the following beneficial effects: when the power supply voltage is greater than 50V, the electronic leakage protection function is activated, and when the power supply voltage is lower than 50V, the electromagnetic leakage protection function is activated; the advantages of both electronic and electromagnetic leakage are combined. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0015] Figure 1 The present invention is a block diagram of the working principle of the electromagnetic and electronic B-type leakage circuit.

[0016] Figure 2 yes Figure 1 Schematic diagram of the Type B leakage detection module.

[0017] Figure 3 yes Figure 1 The schematic diagram of the detection execution circuit consists of an electronic zero-sequence current transformer, a B-type leakage detection module, an electronic leakage release drive circuit, an electromagnetic zero-sequence current transformer, an electromagnetic leakage release drive circuit, and a leakage release.

[0018] Figure 4 yes Figure 1The power supply circuit schematic diagram consists of a power supply circuit, a switching power supply, and a 5V voltage regulator circuit.

[0019] In the figure, 1-electronic zero-sequence current transformer, 2-electromagnetic zero-sequence current transformer, 3-type B leakage detection module, 4-NMOS switching circuit, 5-electronic leakage release drive circuit, 6-leakage release, 7-electromagnetic leakage release drive circuit, 8-power supply circuit, 9-switch circuit, 10-5V voltage stabilizing circuit. DETAILED DESCRIPTION

[0020] See also Figure 1 , is a block diagram of the working principle of the electromagnetic and electronic B-type leakage circuit of the present invention. Figure 1 As shown, in the electromagnetic and electronic B-type leakage circuit provided in the first embodiment of the present invention, at least the following are included: a power supply circuit, a switching power supply, a 5V voltage stabilizing circuit, an NMOS switching circuit, and an electromagnetic leakage detection circuit are electrically connected in sequence, wherein the electromagnetic leakage detection circuit is also electrically connected to an electromagnetic zero-sequence current transformer and an electromagnetic leakage tripping drive circuit, respectively; the electromagnetic leakage tripping drive circuit is electrically connected to an electromagnetic leakage releaser, the electromagnetic leakage releaser is electrically connected to an electronic leakage tripping drive circuit, the electronic leakage tripping drive circuit is electrically connected to an electronic leakage detection circuit, the electronic leakage detection circuit is electrically connected to a B-type leakage detection module, and the B-type leakage detection module is electrically connected to an electronic zero-sequence current transformer.

[0021] Figure 2 yes Figure 1 Schematic diagram of the Type B leakage detection module. Figure 2 ,for Figure 1 The schematic diagram of the Type B leakage detection module. Figure 2 As shown, the B-type leakage detection module includes an integrated circuit U3. The integrated circuit U3 can be MGB001A. It has 5 pins, namely pin 1-Coil_01, pin 2-Coil_02, pin 3-+5V, pin 4-Trip, and pin 5-GND.

[0022] Figure 3 yes Figure 1 The schematic diagram of the detection execution circuit is composed of an electronic zero-sequence current transformer, a B-type leakage detection module, an electronic leakage release drive circuit, an electromagnetic zero-sequence current transformer, an electromagnetic leakage release drive circuit, and a leakage release. Figure 3As shown, the NMOS switch circuit includes a resistor R3 and an NMOS tube Q1, and the gate G of the NMOS tube Q1 is connected in series with the resistor R3. The electronic leakage tripping drive circuit includes resistors R11, R7, R4, R5, R6, transistors Q2, Q3, and a diode D11; one end of the resistor R11 is respectively connected to one end of the resistor R7 and one end of the resistor R4, the other end of the resistor R7 is grounded, the other end of the resistor R4 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is respectively connected to one end of the resistor R5 and the base of the transistor Q3, the collector of the transistor Q3 is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to the positive electrode of the diode D11. The electromagnetic leakage tripping drive circuit includes an NMOS switch circuit, diodes D12 and D13, capacitors C2 and C5, and wiring ports J7 and J8. The positive electrode of the diode D12 is respectively connected to the negative electrode of the diode D13, the drain D of the NMOS tube Q1, and the positive electrode of the capacitor C2. The negative electrode of the diode D12 is respectively connected to the positive electrode of the diode D13, the source S of the NMOS tube Q1, and the positive electrode of the capacitor C5 and grounded. The negative electrode of the diode D12 is led out of the wiring port J8, the positive electrode of the diode D12 is led out of the wiring port J7, and the negative electrode of the capacitor C2 is connected to the negative electrode of the capacitor C5. The B-type leakage detection module includes an integrated circuit U3. The integrated circuit U3 can select MGB001A.

[0023] Figure 4 yes Figure 1 The power supply circuit schematic diagram consists of a power supply circuit, a switching power supply, and a 5V voltage regulator circuit. Figure 4 As shown, the switching power supply includes capacitors C7, C10, C3, diodes D8, D9, resistors R2, R8, inductor L2, and integrated circuit U1; the cathode of capacitor C7 and the anode of diode D9 are grounded, the anode of capacitor C7 is connected to the D pin of integrated circuit U1, the FB pin of integrated circuit U1 is respectively connected to one end of resistor R8 and one end of resistor R2, the BP pin of integrated circuit U1 is connected to one end of capacitor C10, the other end of capacitor C10 is respectively connected to the S pin of integrated circuit U1, the cathode of diode D9, the other end of resistor R8, one end of capacitor C3, and one end of inductor L2, the cathode of diode D9 is connected to the S pin of integrated circuit U1, the other end of resistor R2 is respectively connected to the other end of capacitor C3 and the anode of diode D8, and the cathode of diode D8 is connected to the other end of inductor L2.

[0024] Among them, the 5V voltage stabilizing circuit includes a voltage stabilizing integrated circuit U2.

[0025] The power supply circuit includes varistors RV1, RV2, RV3, wiring ports J1, J2, J3, J4, diodes D1, D2, D3, D4, D5, D6, resistors R20, R21, one end of the varistor RV1 is led out of the wiring port J1 and connected to the positive electrode of the diode D1, the other end of the varistor RV1 is respectively connected to one end of the varistor RV2, one end of the varistor RV3, and one end of the varistor RV4, the other end of the varistor RV4 is led out of the wiring port J4 and grounded, the other end of the varistor RV2 is led out of the wiring port J4 and grounded Port J2 is connected to the anode of diode D3, the cathode of diode D3 is connected to the anode of diode D4, the cathode of diode D1 is connected to the anode of diode D2, the cathode of diode D3 is connected to the anode of diode D4, the cathode of diode D5 is connected to the anode of diode D6, the cathode of diode D2, the cathode of diode D4, and the cathode of diode D6 are connected and connected to one end of resistor R20, the other end of resistor R20 is connected to one end of resistor R21, and the other end of varistor RV3 is led out of wiring port J3 and connected to the anode of diode D5.

[0026] The power circuit is connected to the positive electrode of the capacitor C7 of the switching power supply and the D pin of the integrated circuit U1 through the other end of the resistor R21. In specific implementation, capacitors C4, C6 and C8 are also arranged between the switching power supply and the 5V voltage stabilizing circuit. The positive electrode of the diode D8 is respectively connected to the positive electrode of the capacitor C4, one end of the capacitor C8, and the Vin pin of the voltage stabilizing integrated circuit U2. The negative electrode of the capacitor C4 is respectively connected to the other end of the capacitor C8, the Gnd pin of the voltage stabilizing integrated circuit U2, and the negative electrode of the capacitor C6. The Vout of the voltage stabilizing integrated circuit U2 outputs a 5V voltage. The Vin of the voltage stabilizing integrated circuit U2 inputs a 12V voltage.

[0027] The electromagnetic and electronic B-type leakage circuit of the present invention has the following working principle: when the voltage of the power supply is greater than 50V (relative to the ground), it flows into the integrated circuit in the switching power supply after diode rectification and resistor voltage reduction in the power supply circuit, and becomes 5V-12V voltage after filtering and voltage reduction. One way supplies power to the electronic leakage release module, and the other way outputs 5V voltage through a 5V voltage regulator tube and transmits it to the NMOS switch circuit in the electromagnetic leakage release drive circuit. When only the NMOS circuit inputs 5V voltage, the NMOS tube is turned on, the two ends of the electromagnetic zero-sequence current transformer are short-circuited, the entire electromagnetic leakage release drive circuit loses its function, and the electronic B-type leakage part plays a protective role. If there is leakage current in the circuit, the electronic zero-sequence current transformer detects the leakage current of the circuit and transmits the leakage current to the B-type leakage detection module, performs sinusoidal AC, pulse DC, and smooth DC current detection and processing conversion, and transmits the converted current to the electronic leakage release drive module, and then to the electronic leakage release, so that the releaser acts.

[0028] When the power supply has no voltage or the voltage is less than 50V (relative to the ground), the integrated circuit in the switching power supply does not work and cannot provide power to drive the electronic leakage release module to work, so the electronic leakage protection circuit partially loses its protection function. Only when the NMOS circuit inputs 5V voltage can the NMOS tube be turned on, but because the switching power supply does not work, the voltage supplied to the NMOS tube is less than 5V, the NMOS tube is open, and the electromagnetic leakage protection circuit can exercise the leakage protection function. If there is leakage current in the line, the electromagnetic zero-sequence current transformer detects the line leakage current and transmits the processed current signal to the electromagnetic leakage release to make the release operate.

[0029] Through the design of the above embodiments, the present invention can achieve the electronic leakage protection function when the power supply voltage is greater than 50V, and the electromagnetic leakage protection function when the power supply voltage is lower than 50V; it combines the advantages of electronic and electromagnetic leakage.

[0030] The present invention is described with reference to specific embodiments, but it should be understood by those skilled in the art that various changes and equivalent substitutions may be made without departing from the scope of the present invention. In addition, in order to adapt to specific occasions of the present invention, the present invention may be modified in many ways without departing from its scope of protection. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all embodiments falling within the scope of protection of the claims.

Claims

1. A B-type leakage circuit with electromagnetic and electronic types, characterized in that: include: The electromagnetic leakage detection circuit is electrically connected in sequence to an electromagnetic zero-sequence current transformer and an electromagnetic leakage tripping drive circuit, the electromagnetic leakage tripping drive circuit is electrically connected to an electromagnetic leakage tripper, the electromagnetic leakage tripper is electrically connected to an electronic leakage tripping drive circuit, the electronic leakage tripping drive circuit is electrically connected to an electronic leakage detection circuit, the electronic leakage detection circuit is electrically connected to a B-type leakage detection module, and the B-type leakage detection module is electrically connected to an electronic zero-sequence current transformer; The NMOS switch circuit includes a resistor R3 and an NMOS tube Q1, wherein a gate G of the NMOS tube Q1 is connected in series with the resistor R3; The electromagnetic leakage tripping drive circuit includes an NMOS switch circuit, diodes D12 and D13, capacitors C2 and C5, and connection ports J7 and J8. The positive electrode of the diode D12 is respectively connected to the negative electrode of the diode D13, the drain D of the NMOS tube Q1, and the positive electrode of the capacitor C2. The negative electrode of the diode D12 is respectively connected to the positive electrode of the diode D13, the source S of the NMOS tube Q1, and the positive electrode of the capacitor C5 and is grounded. The negative electrode of the diode D12 is led out of the connection port J8, and the positive electrode of the diode D12 is led out of the connection port J7. The connection ports J7 and J8 are respectively connected to the two ends of the electromagnetic zero-sequence current transformer, and the negative electrode of the capacitor C2 is connected to the negative electrode of the capacitor C5.

2. The electromagnetic and electronic B-type leakage circuit according to claim 1, characterized in that: The switching power supply includes capacitors C7, C10, C3, diodes D8, D9, resistors R2, R8, inductor L2, and integrated circuit U1; the cathode of capacitor C7 and the anode of diode D9 are grounded, the anode of capacitor C7 is connected to the D pin of integrated circuit U1, the FB pin of integrated circuit U1 is respectively connected to one end of resistor R8 and one end of resistor R2, the BP pin of integrated circuit U1 is connected to one end of capacitor C10, the other end of capacitor C10 is respectively connected to the S pin of integrated circuit U1, the cathode of diode D9, the other end of resistor R8, one end of capacitor C3, and one end of inductor L2, the cathode of diode D9 is connected to the S pin of integrated circuit U1, the other end of resistor R2 is respectively connected to the other end of capacitor C3 and the anode of diode D8, and the cathode of diode D8 is connected to the other end of inductor L2.

3. The electromagnetic and electronic B-type leakage circuit according to claim 1, characterized in that: The 5V voltage stabilizing circuit includes a voltage stabilizing integrated circuit U2.

4. The electromagnetic and electronic B-type leakage circuit according to claim 1, characterized in that: The electronic leakage tripping driving circuit comprises resistors R11, R7, R4, R5, R6, transistors Q2, Q3, and a diode D11; one end of the resistor R11 is respectively connected to one end of the resistor R7 and one end of the resistor R4, the other end of the resistor R7 is grounded, the other end of the resistor R4 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is respectively connected to one end of the resistor R5 and the base of the transistor Q3, the collector of the transistor Q3 is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to the positive electrode of the diode D11.

5. The electromagnetic and electronic B-type leakage circuit according to claim 1, characterized in that: The B-type leakage detection module includes an integrated circuit U3.

6. The electromagnetic and electronic B-type leakage circuit according to claim 1, characterized in that: The power supply circuit includes varistors RV1, RV2, RV3, wiring ports J1, J2, J3, J4, diodes D1, D2, D3, D4, D5, D6, resistors R20, R21, one end of the varistor RV1 is led out of the wiring port J1 and connected to the positive electrode of the diode D1, the other end of the varistor RV1 is respectively connected to one end of the varistor RV2, one end of the varistor RV3, and one end of the varistor RV4, the other end of the varistor RV4 is led out of the wiring port J4 and grounded, the other end of the varistor RV2 is led out of the wiring port Port J2 is connected to the anode of diode D3, the cathode of diode D3 is connected to the anode of diode D4, the cathode of diode D1 is connected to the anode of diode D2, the cathode of diode D3 is connected to the anode of diode D4, the cathode of diode D5 is connected to the anode of diode D6, the cathode of diode D2, the cathode of diode D4 and the cathode of diode D6 are connected and connected to one end of resistor R20, the other end of resistor R20 is connected to one end of resistor R21, and the other end of varistor RV3 is led out of wiring port J3 and connected to the anode of diode D5.

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