Circuit breaker

Abstract

A circuit breaker comprises a low-voltage circuit breaker body, an input voltage detection circuit, an output voltage detection circuit, a comparison prompt circuit and a temperature detection circuit. The input voltage detection circuit, the output voltage detection circuit, the comparison prompt circuit and the temperature detection circuit are installed in the circuit breaker body and are electrically connected. Based on the low-voltage circuit breaker body, in the application, the input voltage detection circuit and the output voltage detection circuit can monitor the performance of a movable contact (an output power end) and a static contact (an input power end) in the low-voltage circuit breaker body in real time, and the temperature detection circuit can monitor temperature data in the shell in real time. When the resistance value of the static contact and the movable contact is too large or the static contact and the movable contact are open-circuited or the internal temperature is too high, a worker can be prompted to carry out overhaul and maintenance, a total input power supply can be automatically cut off, and the probability of self damage and damage of electric equipment with abnormal voltage is reduced. On the basis, the device has a good application prospect.

Description

Technical Field

[0001] The utility model relates to the field of circuit breaker equipment, in particular to a circuit breaker. Background Art

[0002] A circuit breaker is a switch device that can close and open the current under normal and abnormal circuit conditions. It is mainly composed of a contact system, an arc extinguishing system, an operating mechanism, and a release housing. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Circuit breakers above 3kV are usually called high-voltage electrical appliances. Low-voltage circuit breakers are also called air switches, which have multiple protection functions, equivalent to the sum of some or all functions of electrical appliances such as knife switches and leakage protectors.

[0003] The authorized patent of my country with the patent name "Circuit Breaker Base and Circuit Breaker" and the patent number "202122749240.X" records that "the circuit breaker base can be easily maintained, and there is no need to disconnect the main switch during maintenance". As can be seen from the above, although the comparative patent has achieved the technical effect of the invention to a certain extent, it is limited by the structure and has some technical shortcomings like the existing technology in this field. First, it is impossible to monitor the performance of the moving contact and the static contact. When the moving contact or the static contact is poorly contacted due to various reasons, or the resistance value becomes larger, the voltage difference between the input and output ends will be too large, which will have an adverse effect on the operation of the electrical equipment. Second, it does not have a temperature monitoring function. In this way, when the temperature inside the circuit breaker is too high, there is a probability that other components will be damaged due to excessive temperature. In summary, it is particularly necessary to provide a circuit breaker that can monitor the performance of the internal moving contacts and static contacts in real time, and can also promptly remind the staff when the temperature is abnormal, and disconnect the output power supply, thereby reducing the probability of damage to the circuit breaker body. Utility Model Content

[0004] In order to overcome the drawbacks of existing circuit breakers due to structural limitations as described in the background, the utility model provides a circuit breaker based on a low-voltage circuit breaker body. During application, the performance of moving contacts and static contacts in the low-voltage circuit breaker body can be monitored in real time. When the resistance values ​​of the static contacts and the moving contacts are too large or open, or the temperature inside the shell is too high, the staff can be prompted to perform inspection and maintenance respectively, and the total input power can be automatically disconnected, thereby reducing the probability of self-damage and damage to electrical equipment due to abnormal voltage.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A circuit breaker comprises a low-voltage circuit breaker body, characterized in that it also comprises an input voltage detection circuit, an output voltage detection circuit, a comparison prompt circuit, and a temperature detection circuit; the input voltage detection circuit, the output voltage detection circuit, the comparison prompt circuit, and the temperature detection circuit are installed in the circuit breaker body; the signal output end of the input voltage detection circuit and the output voltage detection circuit are electrically connected to the signal input end of the comparison prompt circuit; the signal output end of the comparison prompt circuit is electrically connected to the signal input end of the temperature detection circuit, and the signal output end of the temperature detection circuit is electrically connected to two contacts under a leakage test button of the circuit breaker body; the power input ends of the output voltage detection circuit and the input voltage detection circuit are electrically connected to the output end of the circuit breaker body and the total power input end, respectively.

[0007] Furthermore, the input voltage detection circuit and the output voltage detection circuit are constructed in the same manner, both comprising an electrically connected bridge stack, a resistor, and a capacitor, wherein the positive power supply output terminal of the bridge stack is connected to the positive electrode of the capacitor and one end of the first resistor, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the negative electrode of the capacitor and the negative power supply output terminal of the bridge stack.

[0008] Furthermore, the comparison prompt circuit includes an electrically connected operational amplifier and a resistor, a transistor, a buzzer, and a diode, the positive power input terminal of the operational amplifier is connected to the emitter of the transistor, the output terminal of the operational amplifier is connected to one end of the resistor, the other end of the resistor is connected to the base of the transistor and the positive electrode of the diode, and the negative power input terminal of the operational amplifier is connected to the negative power input terminal of the buzzer.

[0009] Furthermore, the temperature detection circuit includes an electrically connected thermistor, a transistor, a buzzer, a relay, and a diode, one end of the thermistor is connected to the positive power input terminal of the buzzer and the positive power input terminal of the relay, the other end of the thermistor is connected to one end of the first resistor and one end of the second resistor, the other end of the second resistor is connected to the positive electrode of the diode, the cathode of the diode is connected to the base of the transistor, the collector of the transistor is connected to the negative power input terminal of the relay and the negative power input terminal of the buzzer, and the other end of the first resistor is connected to the emitter of the transistor.

[0010] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention is based on a low-voltage circuit breaker body. In application, the input voltage detection circuit and the output voltage detection circuit can monitor the performance of the moving contact (output power supply end) and the static contact (input power supply end) in the low-voltage circuit breaker body in real time. The temperature detection circuit can monitor the temperature data inside the shell in real time. When the resistance value of the static contact and the moving contact is too large or open, or when the internal temperature is too high, the staff can be prompted to perform inspection and maintenance respectively, and the total input power can be automatically disconnected, thereby reducing the probability of self-damage and damage to electrical equipment due to abnormal voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 It is a schematic diagram of the overall structure and the partially enlarged structure of the utility model.

[0013] Figure 2 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0014] Figure 1 , 2 As shown in the figure, a circuit breaker includes a low-voltage circuit breaker body 1, a battery G1, a power module A1, and also has an input voltage detection circuit 2, an output voltage detection circuit 3, a comparison prompt circuit 4, and a temperature detection circuit 5; the battery G1, the power module A1, the input voltage detection circuit 2, the output voltage detection circuit 3, the comparison prompt circuit 4, and the temperature detection circuit 5 are installed on a circuit board inside the circuit breaker body 1.

[0015] Figure 1 , 2As shown in , the input voltage detection circuit includes a bridge stack A2 and resistors R1 and R2, and a capacitor C2 connected via circuit board wiring. The power output terminal 3 pin of the bridge stack A2 is connected to the positive electrode of the capacitor C2 and one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the negative electrode of the capacitor C2 and the negative power output terminal 4 pin of the bridge stack A2. The output voltage detection circuit includes a bridge stack A and resistors R6 and R7, and a capacitor C connected via circuit board wiring. The power output terminal 3 pin of the bridge stack A is connected to the positive electrode of the capacitor C and one end of the first resistor R6, the other end of the first resistor R6 is connected to one end of the second resistor R7, and the other end of the second resistor R7 is connected to the negative electrode of the capacitor C and the negative power output terminal 4 pin of the bridge stack A. The comparison prompt circuit includes an operational amplifier A3 and a resistor R3, a transistor Q1, a buzzer B, and a diode VD1 connected through circuit board wiring. Pin 4 of the positive power input terminal of the operational amplifier A3 is connected to the emitter of the transistor Q1, pin 1 of the output terminal of the operational amplifier A3 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the base of the transistor Q1 and the positive electrode of the diode VD1, and pin 7 of the negative power input terminal of the operational amplifier A3 is connected to the negative power input terminal of the buzzer B. The temperature detection circuit includes a thermistor RT, a transistor Q2, a buzzer B1, a relay K1, a diode VD2, resistors R4 and R5 connected via circuit board wiring, one end of the thermistor RT is connected to the positive power input end of the buzzer B1 and the positive power input end of the relay K1, the other end of the thermistor RT is connected to one end of the first resistor R4 and one end of the second resistor R5, the other end of the second resistor R5 is connected to the positive electrode of the diode VD2, the negative electrode of the diode VD2 is connected to the base of the transistor Q2, the collector of the transistor Q2 is connected to the negative power input end of the relay K1 and the negative power input end of the buzzer B1, and the other end of the first resistor R4 is connected to the emitter of the transistor Q2.The power input terminals 1 and 2 of the power module A1 are connected to the total power input terminal of the circuit breaker body through wires, the power output terminals 3 and 4 of the power module A1 are connected to the other end of the power input terminal resistor R2 of the input voltage detection circuit, the other end of the power input terminal resistor R7 of the output voltage detection circuit, the 4 and 7 pins of the power input terminal op amp A3 of the comparison prompt circuit, one end of the thermistor RT of the power input terminal of the temperature detection circuit and the other end of the resistor R4, and the two poles of the battery G1 (the battery G1 is usually floating charged to ensure that other equipment can be powered and work normally after a power outage) through wires respectively; one end of the signal output terminal resistor R2 of the input voltage detection circuit, one end of the signal output terminal resistor R7 of the output voltage detection circuit The terminal and the reverse input terminal 2 and the in-phase input terminal 3 of the operational amplifier A3 at the signal input terminal of the comparison prompt circuit are respectively connected through wires; the cathode of the diode VD1 at the signal output terminal of the comparison prompt circuit and the base of the transistor Q2 at the signal input terminal of the temperature detection circuit are connected through wires, and the control contact terminal and the normally open contact terminal of the signal output relay K1 of the temperature detection circuit and the two contacts under the leakage test button SY of the circuit breaker body are respectively electrically connected through wires; the power input terminal 1 and 2 pins of the power input terminal bridge stack A of the output voltage detection circuit and the power input terminal 1 and 2 pins of the bridge stack A2 of the input voltage detection circuit are respectively connected to the output terminal (moving contact) and the main power input terminal (static contact) of the circuit breaker body through wires.

[0016] Figure 1 , 2As shown, after the AC 220V power supply enters the power input terminal of the power module A1, the 3rd and 4th pins of the power module A1 output a stable DC 12V power supply which enters the power input terminal of the battery G1 and the input voltage detection circuit, the output voltage detection circuit, the comparison prompt circuit, and the temperature detection circuit. The above circuits are powered on and work. After the input voltage detection circuit is powered on and work, the power supply (static contact) input by the circuit breaker body is converted into a DC power supply (filtered by capacitor C2) through the bridge stack A2, and the DC power supply is divided by the resistors R1 and R2 and enters the inverting input terminal 2 of the operational amplifier A3; after the output voltage detection circuit is powered on and work, the power supply (moving contact) output by the circuit breaker body is converted into a DC power supply (filtered by capacitor C) through the bridge stack A, and the DC power supply is divided by the resistors R6 and R7 and enters the non-inverting input terminal 3 of the operational amplifier A3. In actual situations, the performance of the moving contacts and static contacts inside the circuit breaker body is intact, and there is no excessive resistance or open circuit. The power supply output by bridge stack A2 is divided by resistors R1 and R2 and enters the 2nd pin of operational amplifier A3 with a voltage of 6V. The power supply output by bridge stack A is divided by resistors R6 and R7 and enters the 3rd pin of operational amplifier A3 with a voltage of 6.1V. Pin 1 of operational amplifier A3 outputs a high level. Then, transistor Q1 will not be turned on, and buzzer B will not be energized to make a sound, which means that the performance of the moving contacts and static contacts inside the circuit breaker body is intact. When the performance of the moving contact and the static contact inside the circuit breaker body is not good, the resistance is too large or the circuit is open, the power supply output by the bridge stack A2 is 6V after the resistors R1 and R2 divide the voltage and enter the pin 2 of the operational amplifier A3. The power supply output by the bridge stack A is divided by the resistors R6 and R7 and enters the pin 3 of the operational amplifier A3. The voltage is lower than 6V (even the voltage disappears). The pin 1 of the operational amplifier A3 outputs a low level. Then, the pin 1 of the operational amplifier A3 will output a low level. The low level is limited by the resistor R3 and the voltage is reduced to enter the base of the transistor Q1. The transistor Q 1 will conduct the collector output low level into the positive power input terminal of buzzer B, and buzzer B will sound when energized, indicating that there is a problem with the performance of the moving contact and static contact in the circuit breaker body (at the same time, the low level at the base of transistor Q1 will be unidirectionally conducted through diode VD1 into the base of transistor Q2, and the collector of transistor Q2 will output a low level into the negative power input terminal of relay K1, and relay K1 will be energized to close its control contact terminal and normally open contact terminal), prompting the staff to perform inspection and maintenance.

[0017] Figure 1 , 2As shown, after the temperature detection circuit is powered on, when the temperature in the circuit breaker body 1 is lower than a certain value (for example, lower than 55°C), the resistance value of the thermistor RT is relatively large and the voltage divided between it and the resistor R4 is small. In this way, the 12V power supply is unidirectionally conducted through the thermistor RT, the voltage divided by the resistor R4, and the voltage reduced by the resistor R5, and then passes through the diode VD2 to enter the base of the transistor Q2 below 0.7V. The transistor Q2 will not be turned on, and the buzzer B1 will not be powered on to sound, indicating that the temperature in the circuit breaker body is not too high. When the temperature in the circuit breaker body 1 is higher than a certain value (for example, higher than 55°C), the resistance value of the thermistor RT is relatively small, and the voltage divided between it and the resistor R4 is small. In this way, the 12V power supply is unidirectionally conducted through the thermistor RT, the voltage divided by the resistor R4, and the voltage reduced and limited by the resistor R5 through the diode VD2 to enter the base of the transistor Q2, which is higher than 0.7V. The transistor Q2 will conduct the collector to output a low level and enter the positive power input terminal of the buzzer B1. The buzzer B1 is energized and sounds, indicating that the temperature in the circuit breaker body has increased (at the same time, the low level at the base of the transistor Q1 will be unidirectionally conducted through the diode VD2 to enter the base of the transistor Q2. The transistor Q2 is turned on by the collector to output a low level and enter the negative power input terminal of the relay K1. The relay K1 is energized to close its control contact terminal and the normally open contact terminal), prompting the staff to perform inspection and maintenance. When the output voltage of the circuit breaker body is abnormal or the internal temperature is too high, the relay K1 is energized to close its control contact terminal and normally open contact terminal. Since the control contact terminal and normally open contact terminal of the relay K1 and the two contacts under the leakage test button SY of the circuit breaker body are electrically connected through wires, the circuit breaker body will trip (no longer output power) at this moment, reducing the probability of damage to itself and damage to electrical equipment due to abnormal voltage. Figure 2 Among them, the relay K1 model is DC12V; the diodes VD1 and VD2 models are 1N4001; the battery G1 is a 12V / 10Ah battery; the temperature switch RT is a negative temperature coefficient thermistor model NTG103D (the heating surface is located near the heating coil of the circuit breaker); the power module A1 is a finished product of an AC 220V to DC 12V switching power module; the bridge stacks A2 and A models are KBL406; the transistor Q1 is a PNP transistor model 9012; The models of capacitors C1 and C2 are 470μF / 100V; the model of op amp A3 is UA741; the transistor Q2 is the NPN transistor of model 9013; the buzzers B and B1 are the finished products of active continuous sound buzzer alarm of model FM12V (the sounds of the two are inconsistent, which makes it easy to distinguish whether it is abnormal voltage or excessive temperature inside the shell); the resistance values ​​of resistors R1, R2, R6, R7, R4, and R5 are 5.9K, 6.1K, 6K, 6K, 4.7K, and 10K respectively.

[0018] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0019] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A circuit breaker, comprising a low voltage circuit breaker body, characterized in that: It also has an input voltage detection circuit, an output voltage detection circuit, a comparison prompt circuit, and a temperature detection circuit; the input voltage detection circuit, the output voltage detection circuit, the comparison prompt circuit, and the temperature detection circuit are installed in the circuit breaker body; the signal output ends of the input voltage detection circuit and the output voltage detection circuit are electrically connected to the signal input end of the comparison prompt circuit; the signal output end of the comparison prompt circuit is electrically connected to the signal input end of the temperature detection circuit, and the signal output end of the temperature detection circuit is electrically connected to two contacts under the leakage test button of the circuit breaker body; the power input ends of the output voltage detection circuit and the input voltage detection circuit are electrically connected to the output end of the circuit breaker body and the total power input end respectively.

2. A circuit breaker according to claim 1, characterized in that: The input voltage detection circuit and the output voltage detection circuit have the same structure, both including an electrically connected bridge stack, a resistor, and a capacitor. The positive power supply output end of the bridge stack is connected to the positive pole of the capacitor and one end of the first resistor, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the negative pole of the capacitor and the negative power supply output end of the bridge stack.

3. A circuit breaker according to claim 1, characterized in that: The comparison prompt circuit includes an electrically connected operational amplifier and a resistor, a transistor, a buzzer, and a diode. The positive power input terminal of the operational amplifier is connected to the emitter of the transistor, the output terminal of the operational amplifier is connected to one end of the resistor, the other end of the resistor is connected to the base of the transistor and the positive electrode of the diode, and the negative power input terminal of the operational amplifier is connected to the negative power input terminal of the buzzer.

4. A circuit breaker according to claim 1, characterized in that: The temperature detection circuit includes an electrically connected thermistor, a transistor, a buzzer, a relay, and a diode. One end of the thermistor is connected to the positive power input end of the buzzer and the positive power input end of the relay, the other end of the thermistor is connected to one end of the first resistor and one end of the second resistor, the other end of the second resistor is connected to the positive electrode of the diode, the cathode of the diode is connected to the base of the transistor, the collector of the transistor is connected to the negative power input end of the relay and the negative power input end of the buzzer, and the other end of the first resistor is connected to the emitter of the transistor.

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