A highly reliable residual current protection device control circuit

Abstract

The present invention proposes a highly reliable control circuit of a residual current protection device, comprising a tripper, an electronic tripping circuit, an electromagnetic tripping circuit, a control circuit, a diode D1, and a capacitor C1; the electronic tripping circuit is connected to the tripper through the diode D1, the electromagnetic tripping circuit is connected to the tripper through the capacitor C1, the electronic tripping circuit and the electromagnetic tripping circuit are connected through the diode D1 and the capacitor C1, a switch K1 which can control the electromagnetic tripping circuit to be disconnected or short-circuited is connected between the tripper and the electromagnetic tripping circuit, the control circuit is connected to the switch K1 and the electronic tripping circuit, and the control circuit controls the disconnection or short-circuit of the switch K1 by detecting the working voltage of the electronic tripping circuit.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breaker control circuits, and in particular to a highly reliable residual current protection device control circuit. Background Art

[0002] There are two main types of residual current circuit breakers on the market: residual current circuit breakers that are related to the power supply voltage (also called electronic type) and residual current circuit breakers that are not related to the power supply voltage (also called electromagnetic type).

[0003] In the residual current circuit breaker that is independent of the power supply voltage, the signal sensed by the transformer is both a leakage signal and is used as the driving energy of the release. Leakage protection can be achieved without power supply, with high safety. However, the surge current resistance capability is poor and the function is single, which can only realize AC type and A type leakage protection.

[0004] The residual current circuit breaker related to the power supply voltage uses an electronic circuit board, which can not only realize AC type and A type leakage protection, but also realize B type leakage protection. However, the protection function fails when there is only one live wire. Summary of the invention

[0005] In view of the problems pointed out in the background technology, the present invention proposes a highly reliable residual current protection device control circuit. Through the reverse isolation effect of the diode D1 and the DC isolation effect of the capacitor C1, the electronic tripping circuit signal and the electromagnetic tripping signal can act on the tripper without interfering with each other, realizing a dual-input, single-drive circuit, and effectively combining the residual current operated circuit breaker related to the power supply voltage and the residual current operated circuit breaker unrelated to the power supply voltage. At the same time, in order to solve the problem of poor surge current resistance of the electromagnetic residual current circuit breaker and improve the high reliability requirements after the combination, the present invention monitors the power supply voltage of the circuit, realizes the operation of the electronic tripping circuit when the power supply voltage is higher than the set value, shields the electromagnetic tripping circuit signal, and automatically unlocks the shielding of the electromagnetic circuit when there is only one live wire, so that the product still has a protection function under low voltage.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A highly reliable residual current protection device control circuit comprises a tripper, an electronic tripping circuit, an electromagnetic tripping circuit, a diode D1 and a capacitor C1; the electronic tripping circuit is connected to the tripper through the diode D1, the electromagnetic tripping circuit is connected to the tripper through the capacitor C1, and the electronic tripping circuit and the electromagnetic tripping circuit are connected through the diode D1 and the capacitor C1.

[0008] The present invention is further configured to include a control circuit and a switch K1. A switch K1 that can control the electromagnetic tripping circuit to be disconnected or short-circuited is connected between the release and the electromagnetic tripping circuit. The control circuit is connected to the switch K1 and the electronic tripping circuit. The control circuit controls the disconnection or short-circuit of the switch K1 by detecting the working voltage of the electronic tripping circuit.

[0009] The present invention is further configured that the control circuit includes a resistor R2, a resistor R3, a voltage detector Q2, a resistor R4, and a resistor R5;

[0010] One end of the resistor R2 is connected to the power circuit and the electronic tripping circuit respectively, and the other end of the resistor R2 is connected to one end of the resistor R3 and the voltage detector Q2 respectively;

[0011] The other end of the resistor R3 is respectively connected to the power supply circuit, the voltage detector Q2, one end of the resistor R5, the emitter of the switch K1, the tripper, and the electronic tripping circuit;

[0012] The voltage detector Q2 is connected to one end of the resistor R4, the power circuit, one end of the resistor R5, the emitter of the switch K1, the trip device, and the electronic trip circuit;

[0013] The other end of the resistor R4 is connected to the other end of the resistor R5 and the base of the switch K1;

[0014] One end of the resistor R5 is connected to the base of the switch K1, and the other end of the resistor R5 is connected to the power circuit, the emitter of the switch K1, the tripper, and the electronic tripping circuit;

[0015] The collector of the switch K1 is connected to the electromagnetic tripping circuit and the capacitor C1, and the emitter of the switch K1 is connected to the power supply circuit, the tripper and the electronic tripping circuit.

[0016] The present invention is further configured to include a high voltage detection control circuit, wherein the high voltage detection control circuit is connected between the power supply circuit and the control circuit;

[0017] The high voltage detection control circuit includes a transistor Q1, a resistor R1, and a voltage regulator Z1. The base of the transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the voltage regulator Z1, the other end of the voltage regulator Z1 is respectively connected to the power supply circuit, the control circuit, the emitter of the switch K1, the release, and the electronic release circuit. The collector of the transistor Q1 is connected to the control circuit and the electronic release circuit, and the emitter of the transistor Q1 is connected to the power supply circuit.

[0018] The present invention is further configured to include a high voltage detection control circuit, which includes a transistor Q1, a resistor R1, and a voltage regulator Z1. The base of the transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the voltage regulator Z1, and the other end of the voltage regulator Z1 is respectively connected to the power supply circuit, the control circuit, the emitter of the switch K1, the release, and the electronic release circuit. The emitter of the transistor Q1 is connected to one end of the resistor R2 and the power supply circuit, and the collector of the transistor Q1 is connected to the electronic release circuit.

[0019] The present invention is further configured such that the switch K1 may be a triode, a field effect transistor, or a relay.

[0020] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0021] The present invention provides a highly reliable residual current protection device control circuit. The electronic driving signal can act on the releaser without interfering with the electronic tripping circuit signal and the electromagnetic tripping signal through the reverse isolation effect of the diode D1 and the DC isolation effect of the capacitor C1, thereby realizing a dual-input, single-drive circuit and effectively combining a residual current operated circuit breaker related to the power supply voltage and a residual current operated circuit breaker not related to the power supply voltage.

[0022] By further monitoring the power supply voltage of the circuit, the electronic circuit can be operated when the power supply voltage is higher than the set value, shielding the electromagnetic tripping circuit signal. When there is only one live wire, the shielding of the electromagnetic circuit is automatically released, realizing the product protection function in the absence of voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A circuit diagram of the present invention;

[0025] Figure 2 A circuit diagram of the present invention;

[0026] Figure 3 It is a schematic diagram of the delay time in the present invention;

[0027] Figure 4 A circuit diagram of the present invention;

[0028] Figure 5 A circuit diagram of the present invention;

[0029] Figure 6 A circuit diagram of the present invention;

[0030] Figure 7 It is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] For reference Figure 1-7 The present invention is described:

[0033] A highly reliable residual current protection device control circuit comprises a tripper, an electronic tripping circuit, an electromagnetic tripping circuit, a diode D1 and a capacitor C1; the electronic tripping circuit is connected to the tripper through the diode D1, the electromagnetic tripping circuit is connected to the tripper through the capacitor C1, and the electronic tripping circuit and the electromagnetic tripping circuit are connected through the diode D1 and the capacitor C1.

[0034] The electronic tripping drive signal can act on the releaser without interfering with each other through the reverse isolation effect of diode D1 and the DC isolation effect of capacitor C1, thus realizing a dual-input, single-drive circuit and effectively combining the residual current operated circuit breaker related to the power supply voltage and the residual current operated circuit breaker not related to the power supply voltage.

[0035] When the electronic tripping circuit detects a leakage signal and outputs a DC signal to drive the tripping device through the diode D1, the capacitor C1 acts as a DC isolation to prevent the output electronic tripping signal from being interfered by the electromagnetic tripping circuit.

[0036] When the electromagnetic tripping circuit detects a leakage signal and outputs an AC signal through capacitor C1 to drive the tripper, diode D1 is reversely cut off so that the output electromagnetic tripping signal will not be interfered by the electronic tripping circuit.

[0037] It also includes a control circuit and a switch K1. A switch K1 is connected between the release and the electromagnetic tripping circuit, which can control the electromagnetic tripping circuit to be disconnected or short-circuited. The control circuit is connected to the switch K1 and the electronic tripping circuit. The control circuit controls the disconnection or short-circuit of the switch K1 by detecting the working voltage of the electronic tripping circuit.

[0038] In order to solve the problem of poor current resistance of electromagnetic residual current circuit breakers and improve the requirement for high reliability after combination, the present invention further proposes that a switch K1 that can shield the electromagnetic tripping circuit is connected between the release and the electromagnetic tripping circuit, and the switch K1 is controlled by the control circuit.

[0039] Wherein, the control circuit includes a resistor R2, a resistor R3, a voltage detector Q2, a resistor R4, and a resistor R5.

[0040] One end of the resistor R2 is connected to the power circuit and the electronic tripping circuit respectively, and the other end of the resistor R2 is connected to one end of the resistor R3 and the voltage detector Q2 respectively.

[0041] The other end of the resistor R3 is respectively connected to the power supply circuit, the voltage detector Q2, one end of the resistor R5, the emitter of the switch K1, the release, and the electronic tripping circuit.

[0042] The voltage detector Q2 is connected to one end of the resistor R4, the power supply circuit, one end of the resistor R5, the emitter of the switch K1, the release, and the electronic tripping circuit.

[0043] The other end of the resistor R4 is connected to the other end of the resistor R5 and the base of the switch K1.

[0044] One end of the resistor R5 is connected to the base of the switch K1 , and the other end of the resistor R5 is connected to the power circuit, the emitter of the switch K1 , the release, and the electronic tripping circuit.

[0045] The collector of the switch K1 is connected to the electromagnetic tripping circuit and the capacitor C1, and the emitter of the switch K1 is connected to the power supply circuit, the tripper and the electronic tripping circuit.

[0046] The resistors R2 and R3 in the control circuit divide the power supply voltage of the electronic tripping circuit and then detect it through the voltage detector Q2.

[0047] When the power supply voltage of the electronic tripping circuit is higher than the set value V2, the control circuit outputs a control signal after a delay of T2, and controls the switch K1 to short-circuit or disconnect the electromagnetic tripping circuit, thereby shielding the electromagnetic tripping circuit signal.

[0048] When there is only one live wire, the power supply of the electronic tripping circuit does not work, the power supply voltage is lower than the set value voltage V1, the control circuit outputs a control signal, the control switch K1 cancels the shielding of the electromagnetic tripping circuit, and the electromagnetic tripping circuit works normally.

[0049] In the design, the voltage V1 and the voltage V2 may be equal or unequal.

[0050] The device also includes a high voltage detection control circuit, which is connected between the power supply circuit and the control circuit.

[0051] The high voltage detection control circuit includes a transistor Q1, a resistor R1, and a voltage regulator Z1. The base of the transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the voltage regulator Z1, the other end of the voltage regulator Z1 is respectively connected to the power supply circuit, the control circuit, the emitter of the switch K1, the release, and the electronic release circuit. The collector of the transistor Q1 is connected to the control circuit and the electronic release circuit, and the emitter of the transistor Q1 is connected to the power supply circuit.

[0052] Among them, it also includes a high voltage detection control circuit, which includes a transistor Q1, a resistor R1, and a voltage regulator Z1. The base of the transistor Q1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to one end of the voltage regulator Z1. The other end of the voltage regulator Z1 is respectively connected to the power supply circuit, the control circuit, the emitter of the switch K1, the tripper, and the electronic tripping circuit. The emitter of the transistor Q1 is connected to one end of the resistor R2 and the power supply circuit, and the collector of the transistor Q1 is connected to the electronic tripping circuit. Among them, the switch K1 can be a transistor, a field effect tube, or a relay.

[0053] When the output voltage Vcc of the power circuit after passing through the power conversion circuit is greater than the set value and also greater than the voltage regulator Z1, the transistor Q1 is turned on, and the electronic tripping circuit is powered on and starts to work. At the same time, the voltage detector Q2 samples the voltage V+ through the resistors R2 and R3. If the voltage V+ is greater than the set value, the voltage detector Q2 outputs a signal, the switch K1 is turned on, and the leakage signal provided by the electromagnetic tripping circuit is turned off. The leakage signal provided by the electromagnetic tripping circuit can no longer drive the tripper.

[0054] When there is only one live wire, the power conversion circuit cannot work, the voltage Vcc is 0V, which is less than the voltage regulator Z1, the transistor Q1 is not conducting, the voltage V+ is also 0V, which is less than the working voltage of the electronic tripping circuit, the electronic tripping circuit stops working, and the leakage signal of the electronic tripping circuit cannot play a protective role. At the same time, the voltage V+ is less than the sampling voltage point set by the voltage detector Q2, the voltage detector Q2 has no output signal, the switch K1 is not conducting, the closure of the electromagnetic tripping circuit is released, and the leakage signal of the electromagnetic circuit provides leakage protection.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly reliable residual current protection device control circuit, characterized in that: It includes a trip device, an electronic trip circuit, an electromagnetic trip circuit, a diode D1, and a capacitor C1; the electronic trip circuit is connected to the trip device through the diode D1, the electromagnetic trip circuit is connected to the trip device through the capacitor C1, and the electronic trip circuit and the electromagnetic trip circuit are connected through the diode D1 and the capacitor C1; it also includes a control circuit and a switch K1, a switch K1 that can control the electromagnetic trip circuit to be disconnected or short-circuited is connected between the trip device and the electromagnetic trip circuit, the control circuit is connected to the switch K1 and the electronic trip circuit, and the control circuit controls the disconnection or short-circuit of the switch K1 by detecting the working voltage of the electronic trip circuit; the control circuit includes a resistor R2, a resistor R3, a voltage detector Q2, a resistor R4, and a resistor R5; One end of the resistor R2 is connected to the power circuit and the electronic tripping circuit respectively, and the other end of the resistor R2 is connected to one end of the resistor R3 and the voltage detector Q2 respectively; The other end of the resistor R3 is respectively connected to the power supply circuit, the voltage detector Q2, one end of the resistor R5, the emitter of the switch K1, the tripper, and the electronic tripping circuit; The voltage detector Q2 is connected to one end of the resistor R4, the power circuit, one end of the resistor R5, the emitter of the switch K1, the trip device, and the electronic trip circuit; The other end of the resistor R4 is connected to the other end of the resistor R5 and the base of the switch K1; One end of the resistor R5 is connected to the base of the switch K1, and the other end of the resistor R5 is connected to the power circuit, the emitter of the switch K1, the tripper, and the electronic tripping circuit; The collector of the switch K1 is connected to the electromagnetic tripping circuit and the capacitor C1, and the emitter of the switch K1 is connected to the power supply circuit, the tripper and the electronic tripping circuit.

2. A highly reliable residual current protection device control circuit according to claim 1, characterized in that: Also included is a high voltage detection control circuit, which is connected between the power supply circuit and the control circuit; The high voltage detection control circuit includes a transistor Q1, a resistor R1, and a voltage regulator Z1. The base of the transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the voltage regulator Z1, the other end of the voltage regulator Z1 is respectively connected to the power supply circuit, the control circuit, the emitter of the switch K1, the release, and the electronic release circuit. The collector of the transistor Q1 is connected to the control circuit and the electronic release circuit, and the emitter of the transistor Q1 is connected to the power supply circuit.

3. A highly reliable residual current protection device control circuit according to claim 1, characterized in that: It also includes a high voltage detection control circuit, which includes a transistor Q1, a resistor R1, and a voltage regulator Z1. The base of the transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to one end of the voltage regulator Z1, and the other end of the voltage regulator Z1 is respectively connected to the power supply circuit, the control circuit, the emitter of the switch K1, the release, and the electronic release circuit. The emitter of the transistor Q1 is connected to one end of the resistor R2 and the power supply circuit, and the collector of the transistor Q1 is connected to the electronic release circuit.

4. A high-reliability residual current protection device control circuit according to claim 2 or 3, characterized in that: The switch K1 is a transistor, a field effect transistor or a relay.

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