CN204967234U - Multi -functional residual current operated circuit breaker circuit - Google Patents

Abstract

The multifunctional residual current action circuit breaker circuit includes a power supply circuit, a leakage signal acquisition control circuit, a tripping circuit and a leakage test circuit, and also includes an overvoltage action circuit. The overvoltage action circuit includes a regulator tube D2, a DC voltage signal input terminal and The control signal output terminal, the power circuit includes a half-wave rectification circuit and a step-down circuit connected to the main circuit; the overvoltage action circuit is connected to the half-wave rectification circuit and the integrated chip of the leakage signal acquisition control circuit, when the DC voltage signal input terminal receives When the DC voltage signal exceeds the set limit value of the voltage regulator tube D2, the tripping action is performed through the triggering tripping circuit of the integrated chip; the leakage signal acquisition control circuit is also connected with the step-down circuit and the main circuit to monitor the remaining voltage of the main circuit. current, the integrated chip controls the tripping circuit to perform a tripping action when the residual current is abnormal. It can realize multiple protection functions of leakage and overvoltage at the same time in a limited volume.

Description

Multifunctional residual current operated circuit breaker circuit

technical field

The utility model belongs to the field of low-voltage electrical appliances, and relates to a residual current operating circuit breaker with overcurrent protection, in particular to a circuit of a multifunctional residual current operating circuit breaker with overcurrent protection and overvoltage protection.

Background technique

At present, when customers use the residual current operated circuit breaker, the input power of the circuit breaker often burns down the load equipment at the lower end of the circuit breaker due to the overvoltage of the power supply caused by the unstable power grid or the mistaken application of 380V voltage to the circuit due to wiring errors. Condition. At present, the circuit breakers on the market only have residual current protection without overvoltage function, or only have overvoltage protection without residual current protection, which greatly affects the basic needs of customers for product reliability and safety. In addition, the existing similar circuit breaker products generally adopt the form of full-wave rectification, resistance-capacity step-down or resistance step-down. and miniaturization disadvantageous. In addition, the temperature of the resistance step-down circuit rises during operation, and it is prone to failure and damage under high temperature conditions, which affects the reliability of the circuit operation and the service life of the components. Although the temperature rise of the resistance-capacitance step-down circuit is low during operation, the cost is high and the ability to withstand high-temperature environments is poor. Moreover, the existing similar circuit breaker products do not have a circuit dedicated to absorbing surge voltage, so they generally cannot withstand 4KV surge impact. It cannot meet the basic needs of users for product reliability and safety.

Utility model content

In order to overcome the defects of the prior art, the purpose of this utility model is to provide a multifunctional residual current operated circuit breaker circuit which can simultaneously realize multiple protection functions of leakage and overvoltage in a limited volume.

In order to achieve the above object, the utility model adopts the following technical solutions:

A multifunctional residual current operating circuit breaker circuit, including a power supply circuit, a leakage signal acquisition control circuit, a tripping circuit, and a leakage testing circuit, and also includes an overvoltage operating circuit, and the overvoltage operating circuit includes a voltage regulator tube D2, a DC A voltage signal input terminal and a control signal output terminal, the power supply circuit includes a half-wave rectification circuit connected to the main circuit and a step-down circuit connected to the half-wave rectification circuit; the DC voltage signal input terminal of the overvoltage action circuit is connected to the half-wave rectification circuit A DC output node on the output side of the rectifier circuit is connected, and the control signal output terminal is connected to the integrated chip of the leakage signal acquisition control circuit. When the DC voltage signal received by the DC voltage signal input terminal of the overvoltage action circuit exceeds the set stable When the limit value of the pressure tube D2 is reached, the output control signal of the overvoltage action circuit is triggered by the integrated chip to perform the tripping action of the tripping circuit; The output node is connected to the main circuit to monitor the residual current of the main circuit, and the integrated chip controls the tripping circuit to perform a tripping action when the residual current is abnormal.

Preferably, the overvoltage action circuit further includes a resistor R13 for voltage division, a resistor R14, and a capacitor C9 for filtering; one end of the resistor R13 is connected to a half-wave rectifier circuit and used as the overvoltage action circuit The DC voltage signal input end of the resistor R13 is connected to one end of the parallel branch of the capacitor C9 and the resistor R14, the other end of the parallel branch of the capacitor C9 and the resistor R14 is grounded, and the negative pole of the regulator tube D2 is connected to the resistor R13. The anode of the regulator tube D2 is used as the control signal output terminal of the overvoltage action circuit.

Preferably, the anode of the regulator tube D2 used as the control signal output terminal of the overvoltage action circuit is connected to the fourth pin 4 of the integrated chip; or connected to the fourth pin 4 and the fifth pin 5 of the integrated chip connected in parallel.

Preferably, the power supply circuit further includes a surge absorbing circuit, wherein the half-wave rectification circuit includes a rectifier diode VD1, one end of which is connected to the A pole of the thyristor VT1 of the tripping circuit, and the other end is connected to the tripping circuit of the tripping circuit. One end of the buckle coil KA or one end of the piezoresistor RV1 of the surge absorbing circuit is connected.

Preferably, the step-down circuit of the power supply circuit includes a capacitor C8 and a chip resistor module composed of a plurality of chip resistors; one end of the chip resistor module is connected to the negative pole of the diode VD1 of the half-wave rectifier circuit , and connected in parallel with the DC voltage signal input terminal of the overvoltage action circuit and the A pole of the thyristor VT1 of the tripping circuit; The integrated chip of the circuit is connected to the DC output node, and the other end of the capacitor C8 is grounded.

Preferably, the chip resistor module is composed of a plurality of chip resistors combined in series; or, the chip resistor module is composed of at least two series chip resistor groups connected in parallel, each of which is connected in series The chip resistor group is composed of multiple chip resistors in series; or, the chip resistor module is composed of at least two parallel chip resistor groups in series, wherein each parallel chip resistor group is composed of multiple Chip resistors are combined in parallel.

Preferably, the leakage signal acquisition control circuit includes an integrated chip, a zero-sequence transformer TA, a bidirectional diode D1, a debugging resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, Capacitor C6 and capacitor C7; debugging resistor R1, bidirectional diode D1, and capacitor C1 are sequentially connected in parallel at both ends of the secondary circuit lead of zero-sequence transformer TA; one end of resistor R2 is connected to one end of capacitor C1, and the other end of resistor R2 One end of capacitor C2, one end of capacitor C3 are connected in parallel with the first pin 1 of the integrated chip; one end of resistor R3 is connected to the other end of capacitor C1, the other end of resistor R3 is connected to the other end of capacitor C2, and the other end of capacitor C4 One end is connected in parallel with the second pin 2 of the integrated chip; the other end of the capacitor C3 is connected with the other end of the capacitor C4 and the third pin 3 of the integrated chip; the fourth pin 4 and the fifth pin of the integrated chip 5 is connected in parallel with the positive pole of the regulator tube D2 of the overvoltage action circuit and one end of the capacitor C5, and the other end of the capacitor C5 is grounded; the sixth pin 6 of the integrated chip is connected to one end of the capacitor C6, and the seventh pin of the integrated chip 7 is connected in parallel with the other end of capacitor C6, one end of capacitor C7, and the G pole of the thyristor VT1 of the tripping circuit, the other end of capacitor C7 is grounded, and the eighth pin 8 of the integrated chip is connected to another DC output of the power circuit node connection.

Preferably, the tripping circuit includes a tripping coil KA and a thyristor VT1, and one end of the tripping coil KA is connected in parallel with one end of the varistor RV1 of the surge absorbing circuit and the live wire L on the AC input side of the power circuit , the other end of the trip coil KA is connected to the anode of the diode VD1 of the half-wave rectifier circuit.

Preferably, the tripping circuit includes a tripping coil KA and a thyristor VT1, one end of the tripping coil KA is connected to the other end of the piezoresistor RV1 of the surge absorbing circuit, the AC input side of the power circuit The neutral line N is connected in parallel, and the other end of the trip coil KA is connected in parallel with the K pole of the thyristor VT1 of the trip circuit, the other end of the capacitor C9 of the overvoltage action circuit, and the other end of the resistor R14.

Preferably, one end of the varistor RV1 of the surge absorbing circuit of the power supply circuit is connected in parallel with the diode VD1 of the half-wave rectification circuit and the live wire L on the AC input side, and the other end of the varistor RV1 is connected to the center of the power supply circuit. Sexual line N connection.

The beneficial effects of the multifunctional residual current action circuit breaker circuit of the utility model are: by adopting a power supply circuit, an overvoltage action circuit, a leakage signal acquisition control circuit, a tripping circuit, a leakage test circuit, and a half-wave rectification circuit for the power supply circuit, The chip resistor modularized step-down circuit and the structure of the surge absorbing circuit add various functions such as overvoltage tripping protection and anti-surge on the basis of the original leakage protection function of this type of circuit breaker. Under the limited volume, it effectively reduces the volume of the circuit and simplifies and optimizes the structure of the circuit. At the same time, it can also greatly reduce the voltage drop and temperature rise of the step-down circuit, and effectively improve the reliability and safety of the product while reasonably reducing the production cost.

Description of drawings

Fig. 1 is a structural block diagram of a multifunctional residual current operated circuit breaker circuit of the present invention.

Fig. 2 is a schematic diagram of the circuit structure of the first connection mode of the chip resistor module of the step-down circuit of the multifunctional residual current operated circuit breaker circuit of the present invention.

Fig. 3 is a schematic diagram of the circuit structure of the second connection mode of the chip resistor module of the step-down circuit of the multifunctional residual current operated circuit breaker circuit of the present invention in the first embodiment.

Fig. 4 is a schematic diagram of the circuit structure of the second embodiment of the chip resistance module of the step-down circuit of the multifunctional residual current operated circuit breaker circuit of the present invention.

Fig. 5 is a schematic diagram of the circuit structure of the third embodiment of the chip resistance module of the step-down circuit of the multifunctional residual current operated circuit breaker circuit of the present invention.

detailed description

The specific implementation of the multifunctional residual current operated circuit breaker circuit of the present utility model will be further described below in conjunction with the embodiments given in accompanying drawings 1 to 5 .

Referring to Fig. 1, the utility model's multifunctional residual current operated circuit breaker circuit includes a leakage signal acquisition control circuit, a tripping circuit, a leakage test circuit and a power supply circuit composed of a surge absorbing circuit, a half-wave rectification circuit and a step-down circuit . Leakage signal acquisition control circuit is used to monitor the main circuit L-L1, N-N1 whether there is residual current, and control the tripping circuit to perform tripping action when the residual current occurs; the tripping circuit is used to drive the tripping coil KA (executive device ) to generate a tripping action, which is controlled by the leakage signal acquisition control circuit; the leakage test circuit is used to generate a simulated residual current to detect whether the tripping action of the residual current operated circuit breaker is effective; the power circuit is from the main circuit L-L1, N -N1 takes AC power, that is: the live wire L on the AC input side of the power circuit is connected to the live wire phase L-L1 of the main circuit, the neutral wire N on the AC input side of the power circuit is connected to the neutral wire phase N-N1 of the main circuit, and the power supply The positive pole of the DC output side of the circuit provides DC voltage to the leakage signal acquisition control circuit and tripping circuit, and the ground pole of the DC output side of the power circuit (also the common ground pole of the multifunctional residual current operated circuit breaker circuit) is connected to the neutral line N . The power supply circuit of the utility model also has a surge protection function, which is realized by a surge absorbing circuit. A beneficial feature of the utility model is that it also includes an overvoltage action circuit, so that the residual current action circuit breaker product has an overvoltage protection function on the basis of the original leakage current protection function. Considering that the live wire L and the neutral wire N on the AC input side of the power circuit are respectively connected to the live wire phase L-L1 and the neutral wire phase N-N1 of the main circuit, therefore, when the surge absorbing circuit does not absorb the surge voltage, The DC voltage on the output side of the power circuit is related to the AC voltage of the live wire L relative to the neutral wire N (that is, the AC voltage between the live wire phase L-L1 and the neutral wire phase N-N1 of the main circuit), or , the DC voltage signal (signal of voltage fluctuation) on the output side of the power circuit can accurately reflect the degree of AC voltage fluctuation between the live line phase L-L1 and the neutral line phase N-N1 of the main circuit. The utility model utilizes the original integrated chip of the DC voltage signal and leakage signal acquisition control circuit to realize the protection control of overvoltage tripping. Specifically, the multifunctional residual current operated circuit breaker circuit of the present utility model also includes an overvoltage operating circuit, and the overvoltage operating circuit includes a voltage regulator D2, a DC voltage signal input terminal and a control signal output terminal, and the DC voltage The signal input end is connected to a DC output node on the output side of the power supply circuit, and the control signal output end of the overvoltage action circuit is connected to the fourth pin 4 of the integrated chip of the leakage signal acquisition control circuit ( The equivalent structure of this connection is that the fourth pin 4 of the integrated chip shown in Figure 2 and Figure 3 is connected in parallel with the fifth pin 5), and the live wire phase L-L1 reflecting the main circuit from the power supply circuit is monitored by the integrated chip The DC voltage signal of the degree of AC voltage fluctuation between the neutral line phase N-N1, which can reflect whether there is an overvoltage in the main circuit. When the DC voltage signal received by the DC voltage signal input terminal of the overvoltage action circuit exceeds the set When the voltage regulator tube D2 reaches the limit value, the overvoltage action circuit outputs a control signal to trigger the tripping circuit to perform a tripping action through the integrated chip.

The structure of the specific overvoltage action circuit can be various, and a preferred structure is shown in Figure 2 and Figure 3: the overvoltage action circuit also includes a resistor R13 for voltage division, a resistor R14 and a filter for filtering Capacitor C9; one end of the resistor R13 is connected to the half-wave rectifier circuit, that is, one end connected to a DC output node of the power supply circuit is connected to the negative pole of the rectifier diode VD1, which is used as the DC voltage of the overvoltage action circuit The signal input terminal, the other end of the resistor R13 is connected with one end of the parallel branch of the capacitor C9 and the resistor R14, the other end of the parallel branch of the capacitor C9 and the resistor R14 is grounded, the negative pole of the regulator tube D2 is connected with the resistor R13, the regulator tube The positive pole of D2 is used as the control signal output terminal of the overvoltage action circuit. In other words, the other end of the resistor R13 is connected in parallel with one end of the capacitor C9, one end of the resistor R14, and the negative pole of the voltage regulator tube D2, and the other end of the capacitor C9 is connected to the ground with the other end of the resistor R14; the positive pole of the voltage regulator tube D2 Connect with the fourth pin 4 of the integrated chip. It should be understood that the structure of the preferred embodiment of the overvoltage action circuit of the present invention shown in Fig. 2 and Fig. 3, its overvoltage action is based on the reverse withstand voltage value of the voltage regulator tube D2, therefore, the voltage regulator tube D2 The reverse withstand voltage value must match the limit value of the DC voltage signal, which is achieved by modulating the resistor R13 and resistor R14; the limit value of the DC voltage signal is based on the AC voltage of the overvoltage protection The threshold is set, and the set AC voltage threshold must be less than the sensitive voltage of the piezoresistor RV1 of the surge absorbing circuit. The tripping control circuit in the prior art including the integrated chip and the tripping circuit can only realize leakage tripping protection, and cannot realize overvoltage tripping protection at the same time, but the utility model uses the same integrated chip to collect and process leakage signals and overvoltage tripping protection. Voltage signal, and control the same tripping circuit to perform tripping action when the residual current and/or overvoltage are abnormal, realizing the increase of tripping protection function without increasing the tripping control circuit, and using the power circuit The voltage signal of the DC output node is used as the overvoltage signal of the monitoring main circuit, which greatly simplifies the structure of the circuit used for collecting the overvoltage signal. In addition, the overvoltage signal acquisition circuit in the prior art often has a complex structure and a large volume, but the compact overvoltage action circuit of the utility model can be squeezed into the internal space of the existing product, effectively solving the problem of expanding the safety protection function , Improving reliability and safety, and the contradiction between miniaturization design and lower manufacturing cost.

The power supply circuit includes a half-wave rectification circuit, a step-down circuit and a surge absorbing circuit. Another beneficial feature of the utility model is that the power supply circuit adopts a half-wave rectification circuit, that is: the half-wave rectification circuit of the power supply circuit Including the diode VD1; the anode of the diode VD1 is connected to the live line L of the AC input side of the power circuit, and the cathode of the diode VD1 is used as a DC output node of the power circuit, which is used to connect the DC voltage signal input terminal of the overvoltage action circuit, and at the same time It is also connected in parallel with one end of the chip resistance group and the A pole (anode) of the thyristor VT1 of the trip circuit. The half-wave rectifier circuit using diode VD1 has the advantages of simple structure and low DC output voltage (about 0.45 times the AC input voltage), so it can greatly reduce the step-down burden of the step-down circuit. The resistance module provides the possibility of realization, especially the structural combination of the half-wave rectifier circuit using the diode VD1 and the step-down circuit using the chip resistance module, which not only can effectively reduce the temperature rise, but also is very beneficial to the miniaturization of the circuit, and can effectively improve the product level of reliability and safety.

Another beneficial feature of the utility model is that the power supply circuit not only has a DC output node for power supply, but also has a DC output node for overvoltage tripping protection, and its specific structure is shown in Figure 2 and Figure 3: The step-down circuit of the power supply circuit includes a capacitor C8 and a chip resistor module composed of multiple chip resistors; one end of the chip resistor module is connected to the negative pole of the diode VD1 of the half-wave rectifier circuit to form a DC output node , the DC output node is connected in parallel with the DC voltage signal input terminal of the overvoltage action circuit and the A pole of the thyristor VT1 of the trip circuit; the other end of the chip resistor module is connected with one end of the capacitor C8 to form another DC output node, the DC output node is connected to the eighth pin 8 of the integrated chip of the leakage signal acquisition control circuit (that is, used to provide DC voltage to the integrated chip); the other end of the capacitor C8 is grounded. Another beneficial feature of the utility model is that the step-down circuit adopts a chip resistor module composed of multiple chip resistors, which has the advantage that the voltage and temperature rise of each chip resistor can be doubled; In particular, resistance modules combined in series-parallel (first in series and then in parallel as shown in Figure 2) or parallel in series (first in parallel and then in series as shown in Figure 5) can also avoid the failure of one of the resistors. The product does not move, thereby improving the reliability and safety of the product.

The specific structure of the chip resistor module can be in many ways. The first method is shown in Figure 2 and Figure 3. The chip resistor module of the step-down circuit is composed of 8 chip resistors (R5 to R12) in series and then in parallel. The specific combination method is: Chip resistor R5, chip resistor R6, chip resistor R7 and chip resistor R8 are connected in series to form the first series resistor, and chip resistor R9, chip resistor R10, chip resistor R11 and chip resistor R12 are connected in series to form the second series resistor Resistors, the first series resistor and the second series resistor are connected in parallel to form a series-parallel resistor module. The second method is shown in Figure 4, the chip resistor module of the step-down circuit includes 8 chip resistors (R5 to R12), the specific combination is: chip resistor R5, chip resistor R6, Chip resistor R7, chip resistor R8, chip resistor R9, chip resistor R10, chip resistor R11 and chip resistor R12 are connected in series to form a pure series resistor module. The third method is shown in Figure 5: the chip resistor module of the step-down circuit is composed of 8 chip resistors (R5 to R12) connected in parallel and then connected in series. The specific combination method is: chip resistor R5 and Chip resistor R6 is connected in parallel to form the first parallel resistor, chip resistor R7 and chip resistor R8 are connected in parallel to form the second parallel resistor, chip resistor R9 and chip resistor R10 are connected in parallel to form the third parallel resistor, and chip resistor R11 and chip resistor R11 are connected in parallel to form the third parallel resistor. Resistor R12 is connected in parallel to form the fourth parallel resistor group (that is, four pairs of parallel resistors are formed in two-phase series), and the first parallel resistor, the second parallel resistor, the third parallel resistor, and the fourth parallel resistor group are connected in series to form a parallel series A resistor module (that is, four pairs of parallel resistors are connected in series to form a parallel resistor module). The specific structure of the above-mentioned chip resistance module three kinds of preferred modes can be summarized as follows: the chip resistance module of the step-down circuit of the power supply circuit includes eight chip resistors (R5 to R12); eight chip resistors ( R5 to R12) are connected in series to form a pure series resistor module; alternatively, four of the eight chip resistors (R5 to R12) are connected in series to form the first series resistor, and the other four chip resistors (R9 to R12) are connected in series to form a second series resistor, and the first series resistor and the second series resistor are connected in parallel to form a series-parallel resistor module; or, eight chip resistors (R5 to R12) are connected in two-phase series (R5 and R6, R, 7 and R8, R9 and R10, R11 and R12) form four pairs of parallel resistors, and four pairs of parallel resistors are connected in series to form a parallel series resistor module. It is preferable to adopt the best mode of the first mode, which can effectively reduce the temperature rise and is very beneficial to the miniaturization of the circuit.

Another beneficial feature of the utility model is that a surge absorbing circuit is adopted, that is: the surge absorbing circuit of the power supply circuit includes a varistor RV1; one end of the varistor RV1 is connected to the diode of the half-wave rectifier circuit of the power supply circuit VD1 is connected in parallel with the live wire L on the AC input side, and the other end of the varistor RV1 is connected with the neutral wire N of the power circuit. Since the live wire L and the neutral wire N are respectively connected to the live wire phase L-L1 and the neutral wire phase N-N1 of the main circuit, the surge absorption function of the varistor RV1 can not only protect the circuit of the multifunctional residual current operated circuit breaker, It can also effectively protect the circuit downstream of the circuit breaker. Because the utility model adopts the surge absorbing circuit and the matching chip resistance module, the ability to withstand the surge impact is greatly enhanced, and it can withstand the 4KV surge voltage that the existing ordinary products cannot bear. Since the step-down circuit of the power supply circuit adopts the chip resistor module structure, and the surge absorbing circuit adopts the piezoresistor RV1 structure, the residual current operated circuit breaker product has increased the functions of leakage current protection and overvoltage protection. The function of resisting surge voltage, at the same time, the chip resistor module structure can reduce the circuit volume, improve the reliability of the circuit, and reduce the temperature rise of the circuit.

The leakage signal acquisition control circuit includes an integrated chip, a zero-sequence transformer TA, a bidirectional diode D1, a debugging resistor R1, a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6 and Capacitor C7; debugging resistor R1, bidirectional diode D1, and capacitor C1 are connected in parallel to both ends of the secondary circuit lead of zero-sequence transformer TA; one end of resistor R2 is connected to one end of capacitor C1, and the other end of resistor R2 is connected to capacitor C2 One end of the capacitor C3 is connected in parallel with the first pin 1 of the integrated chip; one end of the resistor R3 is connected to the other end of the capacitor C1, the other end of the resistor R3 is connected to the other end of the capacitor C2, and one end of the capacitor C4 is connected to the integrated chip. The second pin 2 of the chip is connected in parallel; the other end of the capacitor C3 is connected to the other end of the capacitor C4 and the third pin 3 of the integrated chip; the fourth pin 4 and the fifth pin 5 of the integrated chip are connected to the ground. The positive pole of the voltage regulator tube D2 of the pressure action circuit is connected in parallel with one end of the capacitor C5, and the other end of the capacitor C5 is grounded; the sixth pin 6 of the integrated chip is connected to one end of the capacitor C6, and the seventh pin 7 of the integrated chip is connected to the capacitor The other end of C6, one end of capacitor C7, and the G pole (control pole) of the thyristor VT1 of the tripping circuit are connected in parallel, the other end of capacitor C7 is grounded, and the eighth pin 8 of the integrated chip is connected to another DC of the power supply circuit. Output node connections. Described integrated chip adopts the electronic device of commercialization, and its structure and function are known, and the beneficial characteristic of the utility model is that integrated chip has formed two control input ends, and wherein: one is newly added overvoltage protection control The input terminal is formed by connecting the fourth pin 4 and the fifth pin 5 of the integrated chip, and is connected in parallel with the DC voltage signal input terminal of the overvoltage action circuit (ie, the positive pole of the regulator tube D2); the other is The leakage protection control input terminal is composed of the first pin 1 of the integrated chip, and collects the residual current signal from the zero-sequence transformer TA.

The tripping circuit includes a tripping coil KA and a thyristor VT1; the G pole (control pole) of the thyristor VT1 is connected to the seventh pin 7 of the integrated chip, and the A pole (anode) of the thyristor VT1 and the controllable The K pole (cathode) of the silicon VT1 is respectively connected to the live line L on the AC input side of the power circuit and the neutral line N on the AC input side to form an on/off control loop, and the tripping coil KA is connected in series to the on/off control loop. in the loop. The on/off control loop has two states of on and off under the control of the G pole of the thyristor VT1: under normal conditions of the main circuit (L-L1, N-N1), the leakage signal acquisition control circuit controls The thyristor VT1 is turned off (making the on/off control loop in the off state), and the current in the trip coil KA connected in series in the on/off control loop cannot excite the trip coil to generate a trip action; when the main circuit (L -L1, N-N1) when residual current (leakage current) occurs, the leakage signal acquisition control circuit controls the conduction of the thyristor VT1 (triggering the conduction of the on/off control loop), and the disconnection in the on/off control loop is connected in series The increase of the current in the buckle coil KA, so that the trip coil is excited to generate a tripping action.

The specific structure of the tripping circuit can be in many ways. A preferred method is shown in Figure 2, the tripping circuit includes a tripping coil KA and a thyristor VT1, one end of the tripping coil KA and one end of the piezoresistor RV1 of the surge absorbing circuit, and one end of the power supply circuit The live wire L on the AC input side is connected in parallel, and the other end of the tripping coil KA is connected to the anode of the diode VD1 of the half-wave rectifier circuit. Another preferred way is shown in Figure 3, the tripping circuit includes a tripping coil KA and a thyristor VT1, one end of the tripping coil KA is connected to the other end of the piezoresistor RV1 of the surge absorbing circuit One end, the neutral line N on the AC input side of the power circuit is connected in parallel, the other end of the trip coil KA is connected to the K pole of the thyristor VT1 of the trip circuit, the other end of the capacitor C9 of the overvoltage action circuit and the resistor R14 The other end is connected in parallel.

The test loop includes a normally open test switch S1 and a resistor R4, the normally open test switch S1 and the resistor R4 are connected in series to form a loop, and the loop is connected in parallel to the live wire phase (L-L1) of the main circuit after passing through the zero sequence transformer TA Between the neutral phase (N-N1). When the test switch S1 is manually pressed to conduct the test circuit, the current flowing in the test circuit can simulate the residual current, so that the residual current signal will be induced in the secondary circuit of the zero-sequence transformer TA, and the signal can Trigger the tripping coil KA to generate a tripping action, so as to detect whether the tripping protection of the circuit breaker is normal.

The control process of the tripping protection function of the present invention will be further described below in conjunction with the embodiments given in FIGS. 1 to 3 .

Overvoltage tripping protection process: the power supply voltage (AC voltage on the AC input side) is rectified by a half-wave rectifier circuit and converted into a DC voltage (signal), and the DC voltage is output from a DC output node of the power circuit to the overvoltage action circuit. The overvoltage action circuit applies the DC voltage signal to the regulator tube D2 after being divided by the resistor R13 and the resistor R14 and filtered by the capacitor C9. When the voltage applied to the regulator tube D2 exceeds the withstand voltage value of the regulator tube D2 (that is, the When the DC voltage exceeds the limit value), the voltage regulator D2 is turned on and outputs a high level to the fourth pin 4 and fifth pin 5 of the integrated chip, so that the seventh pin 7 of the integrated chip outputs a high level to the thyristor VT1 The G pole of the thyristor VT1 triggers the conduction between the A pole (anode) and the K pole (cathode) of the thyristor VT1, causing the tripping coil KA to generate a tripping action.

Leakage tripping protection process: When the main circuit has residual current, the secondary circuit of the zero-sequence transformer TA will induce a leakage signal, and the leakage signal will increase the pressure difference between the first pin 1 and the second pin 2 of the integrated chip. High, so that the seventh pin 7 of the integrated chip outputs a high level to the G pole (control pole) of the thyristor VT1, triggering the conduction between the A pole (anode) and the K pole (cathode) of the thyristor VT1, resulting in tripping Coil KA produces a tripping action.

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is only limited to these descriptions. For a person of ordinary skill in the technical field to which the utility model belongs, without departing from the concept of the utility model, some simple deduction or substitutions can also be made, which should be regarded as belonging to the protection scope of the utility model.

Claims (10)

1. a multifunction residual current action breaker circuit, comprise power circuit, electric leakage signal acquisition control circuit, trip circuit and leakage tests circuit, it is characterized in that: also comprise overvoltage actuating circuit, described overvoltage actuating circuit comprises voltage-stabiliser tube D2, d. c. voltage signal input and control signal output, and described power circuit comprises the half-wave rectifying circuit be connected with main circuit and the reduction voltage circuit be connected with half-wave rectifying circuit; The d. c. voltage signal input of overvoltage actuating circuit is connected with a direct current output node of half-wave rectifying circuit outlet side, control signal output is connected with the integrated chip of described electric leakage signal acquisition control circuit, when the d. c. voltage signal that the d. c. voltage signal input having served as pressure actuating circuit receives exceedes the limit value of voltage-stabiliser tube D2 of setting, described overvoltage actuating circuit exports control signal and performs trip action by the trip circuit described in triggering of integrated chip; Described electric leakage signal acquisition control circuit is also connected the residual current of monitoring main circuit with the direct current output node of reduction voltage circuit and main circuit respectively, and the trip circuit described in described integrated chip controls when residual current occurs abnormal performs trip action.

2. multifunction residual current action breaker circuit according to claim 1, is characterized in that: described overvoltage actuating circuit also comprises for resistance R13, the resistance R14 of dividing potential drop and the electric capacity C9 for filtering; One end of resistance R13 is connected with half-wave rectifying circuit, as the d. c. voltage signal input of described overvoltage actuating circuit, the other end of resistance R13 is connected with one end of resistance R14 parallel branch with electric capacity C9, the other end ground connection of electric capacity C9 and resistance R14 parallel branch, the negative pole of voltage-stabiliser tube D2 is connected with resistance R13, and the positive pole of voltage-stabiliser tube D2 is used as the control signal output of described overvoltage actuating circuit.

3. multifunction residual current action breaker circuit according to claim 2, is characterized in that: the described positive pole of voltage-stabiliser tube D2 being used as the control signal output of overvoltage actuating circuit is connected with the 4th pin of integrated chip; Or be connected in parallel with the 4th pin of integrated chip and the 5th pin.

4. multifunction residual current action breaker circuit according to claim 1, it is characterized in that: described power circuit also comprises surge absorbing circuit, wherein half-wave rectifying circuit comprises a rectifier diode VD1, its one end is connected with the A pole of the controllable silicon VT1 of trip circuit, and the other end is with tripping coil KA one end of trip circuit or be connected with one end of the piezo-resistance RV1 of surge absorbing circuit.

5. the multifunction residual current action breaker circuit according to claim 1 or 4, is characterized in that: the paster type resistor module that the reduction voltage circuit of described power circuit comprises electric capacity C8 and combined by multiple Chip-R; One end of paster type resistor module is connected with the negative pole of the diode VD1 of half-wave rectifying circuit, and is connected in parallel with the A pole of the d. c. voltage signal input of overvoltage actuating circuit, the controllable silicon VT1 of trip circuit; The other end and one end of electric capacity C8 of paster type resistor module connect and compose another direct current output node be connected with the integrated chip of electric leakage signal acquisition control circuit, the other end ground connection of electric capacity C8.

6. multifunction residual current action breaker circuit according to claim 5, is characterized in that: described paster type resistor module is formed by multiple Chip-R tandem compound; Or described paster type resistor module is formed by least two series patch resistor group parallel combinations, and wherein each series patch resistor group is formed by multiple Chip-R tandem compound; Or described paster type resistor module is formed by least two Chip-R group tandem compounds in parallel, and wherein each Chip-R group in parallel is formed by multiple Chip-R parallel combination.

7. multifunction residual current action breaker circuit according to claim 1, is characterized in that: described electric leakage signal acquisition control circuit comprises integrated chip, zero-sequence transformer TA, bidirectional diode D1, debugging resistance R1, resistance R2, resistance R3, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6 and electric capacity C7; Debugging resistance R1, bidirectional diode D1, electric capacity C1 are connected in the two ends of the secondary circuit lead-in wire of zero-sequence transformer TA successively in parallel; One end of resistance R2 is connected with one end of electric capacity C1, and the other end of resistance R2 and one end of electric capacity C2, one end of electric capacity C3 and the first pin of integrated chip are connected in parallel; One end of resistance R3 is connected with the other end of electric capacity C1, and the other end of resistance R3 is connected with the other end of electric capacity C2, one end of electric capacity C4 and the second pin of integrated chip are connected in parallel; The other end of electric capacity C3 and the other end of electric capacity C4, the three-prong of integrated chip be connected ground; 4th pin of integrated chip and the positive pole of voltage-stabiliser tube D2 of the 5th pin and overvoltage actuating circuit, one end of electric capacity C5 are connected in parallel, the other end ground connection of electric capacity C5; 6th pin of integrated chip is connected with one end of electric capacity C6, the G pole of the 7th pin of integrated chip and the other end of electric capacity C6, one end of electric capacity C7, the controllable silicon VT1 of trip circuit is connected in parallel, the other end ground connection of electric capacity C7, the 8th pin of integrated chip is connected with another direct current output node of power circuit.

8. multifunction residual current action breaker circuit according to claim 4, it is characterized in that: described trip circuit comprises tripping coil KA and controllable silicon VT1, one end of tripping coil KA is connected in parallel with one end of the piezo-resistance RV1 of surge absorbing circuit, the live wire L exchanging input side of power circuit, and the other end of tripping coil KA is connected with the positive pole of the diode VD1 of half-wave rectifying circuit.

9. multifunction residual current action breaker circuit according to claim 4, it is characterized in that: described trip circuit comprises tripping coil KA and controllable silicon VT1, described one end of tripping coil KA is connected with the neutral line N parallel of the other end of the piezo-resistance RV1 of surge absorbing circuit, the interchange input side of power circuit, and the K pole of the other end of tripping coil KA and the controllable silicon VT1 of trip circuit, the other end of the electric capacity C9 of overvoltage actuating circuit and the other end of resistance R14 are connected in parallel.

10. multifunction residual current action breaker circuit according to claim 4, it is characterized in that: one end of the piezo-resistance RV1 of the surge absorbing circuit of described power circuit is connected in parallel with the live wire L exchanging input side with the diode VD1 of half-wave rectifying circuit, the other end of piezo-resistance RV1 is connected with the neutral line N of power circuit.