An electric leakage adhesion detection device

Abstract

The utility model discloses a kind of electric leakage adhesion detection devices, including shell, circuit board is arranged in shell, power supply circuit, adhesion detection circuit, electric leakage detection circuit, detection channel circuit, signal input port, signal output port, detection switching circuit are arranged in the circuit board;The power supply circuit is connected with electric leakage detection circuit, adhesion detection circuit and supplies power for it, the input end of detection channel circuit is electrically connected with the binding post of alternating current contactor by signal input port, the output end of detection channel circuit is electrically connected with the input end of electric leakage detection circuit, detection channel circuit respectively by detection switching circuit, the output end of electric leakage detection circuit, detection channel circuit is electrically connected with external controller by signal output port. Circuit in the utility model does not need excessive current to drive when opening detection channel circuit, the output of detection signal is also more stable, with great market promotion prospect.

Description

Technical Field

[0001] This utility model relates to the field of power equipment, and in particular to a leakage current adhesion detection device. Background Technology

[0002] In harsh working conditions such as coal mines and tunnels, high-voltage AC contactors (rated voltage often reaching 660V / 1140V) in high-voltage equipment bear the core function of equipment start-up and power distribution. Their operational reliability and insulation status directly affect production safety. Due to frequent switching of large currents, mechanical vibration, and environmental dust corrosion, contactors are prone to two types of hidden dangers: First, abnormal contact engagement (such as sticking together after power failure), leading to equipment malfunction or short circuit risk; Second, aging of insulation materials under long-term high-voltage impact, causing a decrease in the insulation resistance between the contactor and the casing, resulting in leakage or even breakdown accidents.

[0003] Patent No. ZL201220609351.9 discloses a device for detecting adhesion of AC contactors in tunneling machines. Although it can achieve the effect of adhesion detection, its circuit structure is too complex and the cost is high. At the same time, its adhesion detection signal output is unstable, which is not conducive to market promotion. It is necessary to improve it. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a leakage current adhesion detection device that is simple in structure and easy to use.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A leakage current adhesion detection device includes a housing, within which a circuit board is disposed. The circuit board contains a power supply circuit, an adhesion detection circuit, a leakage current detection circuit, a detection channel circuit, a signal input port, a signal output port, and a detection switching circuit. The power supply circuit is connected to and supplies power to the leakage current detection circuit and the adhesion detection circuit. The input terminal of the detection channel circuit is electrically connected to the terminal of an AC contactor through the signal input port. The output terminal of the detection channel circuit is electrically connected to the input terminals of the leakage current detection circuit and the detection channel circuit respectively through the detection switching circuit. The output terminals of the leakage current detection circuit and the detection channel circuit are both electrically connected to an external controller through the signal output port.

[0007] Furthermore, the detection channel circuit, power supply circuit, and detection switching circuit are all connected to an external 24V power supply through signal output ports.

[0008] Furthermore, there are several detection channel circuits, and each detection channel circuit is correspondingly set with a number of AC contactors. The input terminals of the detection channel circuits are electrically connected to the terminals of the corresponding AC contactors through signal input ports.

[0009] Furthermore, the detection switching circuit and several detection channel circuits are all electrically connected to an external controller through signal output ports and receive selection control signals from the external controller.

[0010] Furthermore, the power supply circuit includes a power chip. The VIN pin of the power chip is connected to one end of capacitor C1, one end of Zener diode D1, and an external 24V power supply. The GND pin of the power chip, the other end of capacitor C1, and the other end of Zener diode D1 are all grounded. The +V0 pin of the power chip is connected to one end of capacitor C3, one end of resistor R1, an adhesion detection circuit, and a leakage detection circuit. The other end of resistor R1 is connected to the anode of indicator LED1. The -V0 pin of the power chip is connected to one end of capacitor C2 and an adhesion detection circuit. The other ends of capacitor C2, capacitor C3, the 0V pin of the power chip, and the cathode of indicator LED1 are all grounded.

[0011] Furthermore, the leakage current detection circuit includes a first operational amplifier chip. The +INA pin of the first operational amplifier chip is connected to one end of capacitor C4 and one end of resistor R6, respectively. The other end of capacitor C4 and the V- pin of the first operational amplifier chip are both grounded. The other end of resistor R6 is connected to the detection switching circuit and one end of resistor R5, respectively. The other end of resistor R5 and the V+ pin of the first operational amplifier chip are both connected to the +V0 pin of the power supply chip. The OUTA pin and -INA pin of the first operational amplifier chip are both connected to an external controller through a signal output port.

[0012] Furthermore, the adhesion detection circuit includes an adhesion detection chip and a second operational amplifier chip. The IN1 pin of the adhesion detection chip is connected to one end of resistor R8 and the third port of the current transformer, respectively. The IN2 pin of the adhesion detection chip is connected to the other end of resistor R8 and the fourth port of the current transformer, respectively. The first port of the current transformer is connected to one end of resistor R7, and the other end of resistor R7 is connected to the detection channel circuit and the detection switching circuit. The second port of the current transformer is grounded. The VSS pin of the adhesion detection chip is connected to the -V0 pin of the power supply chip. The VDD pin of the adhesion detection chip and the V+ pin of the second operational amplifier chip are both connected to the power supply chip. The +V0 pin of the source chip is connected to the adhesion detection chip. The VOUT pin of the adhesion detection chip is connected to one end of capacitor C5 and one end of resistor R9. The other end of resistor R9 is connected to the +INA pin of the second operational amplifier chip. The V- pin of the second operational amplifier chip, the other end of capacitor C5, and the EN, OUTRIN, and GND pins of the adhesion detection chip are all grounded. The -INA pin of the second operational amplifier chip is connected to one end of resistor R10 and one end of resistor R11. The other end of resistor R11 is grounded. The other end of resistor R10 and the OUTA pin of the second operational amplifier chip are connected to an external controller through a signal output port.

[0013] Furthermore, the detection channel circuit includes a relay 1. The first port of the relay 1 is connected to the terminal of the AC contactor through a signal input port. The fourth port of the relay 1 is connected to one end of the resistor R7 and the detection switching circuit. The second port of the relay 1 is connected to the cathode of the diode D2, one end of the resistor R2, and the external 24V power supply. The other end of the resistor R2 is connected to the anode of the indicator LED2. The cathode of the indicator LED2, the anode of the diode D2, and the third port of the relay 1 are all connected to the collector of the transistor Q1. The base of the transistor Q1 is connected to one end of the resistor R3 and one end of the resistor R4. The other end of the resistor R3 is connected to the external controller through a signal output port. The other end of the resistor R4 and the emitter of the transistor Q1 are both grounded.

[0014] Furthermore, the detection switching circuit includes relays 2 and 3. The first port of relay 2 is connected to one end of resistors R5 and R6, and the fourth port of relay 2 is connected to one end of resistor R7 and the fourth port of relay 1. The second port of relay 2 is connected to the cathode of diode D3, one end of resistor R12, and an external 24V power supply. The other end of resistor R12 is connected to the anode of indicator light LED3. The cathode of indicator light LED3, the anode of diode D3, and the third port of relay 2 are all connected to the anode of diode D4. The first port of relay 3 is connected to the housing of the AC contactor, and the fourth port of relay 3... The relay 3 is grounded. The second port of the relay 3 is connected to the cathode of diode D6, one end of resistor R15, and the external 24V power supply. The other end of resistor R15 is connected to the anode of indicator LED4. The cathode of indicator LED4, the anode of diode D6, and the third port of relay 3 are all connected to the anode of diode D5. The cathodes of diodes D4 and D5 are both connected to the collector of transistor Q2. The base of transistor Q2 is connected to one end of resistor R13 and one end of resistor R14. The other end of resistor R13 is connected to the external controller through the signal output port. The other end of resistor R14 and the emitter of transistor Q2 are both grounded.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are:

[0016] In use, this invention connects the signal input port on the circuit board to the high-voltage terminal of the high-voltage AC contactor in the electrical control box, and the signal output port on the circuit board to an external controller. When performing adhesion detection or leakage detection on the AC contactor, the signal output port receives the control signal from the external controller, which opens the selected detection channel circuit. The signal input port collects the signal from the AC contactor and inputs it to the switching detection circuit through the detection channel circuit. The switching detection circuit selects either the adhesion detection circuit or the leakage detection circuit to operate. After detection, the adhesion detection circuit or the leakage detection circuit sends a detection signal to the external controller from the signal output terminal, thus realizing the adhesion and leakage detection operation of the AC contactor. Its circuit structure is simple and the cost is low. At the same time, it does not require excessive current to drive when opening the detection channel circuit, and the output of adhesion detection signal and leakage detection signal is more stable, which has great market promotion prospects. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of the present invention;

[0019] Figure 2 This is a circuit structure framework diagram of the circuit board;

[0020] Figure 3 This is a circuit diagram of the power supply circuit;

[0021] Figure 4 This is a circuit diagram of the adhesion detection circuit;

[0022] Figure 5 This is a circuit diagram of a leakage current detection circuit;

[0023] Figure 6 The circuit structure diagram for the detection channel circuit;

[0024] Figure 7 The circuit structure diagram is for testing the switching circuit. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art to all other embodiments obtained without creative effort should be included within the protection scope of the present utility model.

[0026] like Figures 1 to 7 As shown, this embodiment discloses a leakage current adhesion detection device, including a housing 1. A circuit board is disposed inside the housing 1. The circuit board is provided with a power supply circuit, an adhesion detection circuit, a leakage current detection circuit, a detection channel circuit, a signal input port, a signal output port, and a detection switching circuit. The power supply circuit is connected to and supplies power to the leakage current detection circuit and the adhesion detection circuit. The input terminal of the detection channel circuit is electrically connected to the terminal of an AC contactor through the signal input port. The output terminal of the detection channel circuit is electrically connected to the input terminals of the leakage current detection circuit and the detection channel circuit respectively through the detection switching circuit. The output terminals of the leakage current detection circuit and the detection channel circuit are both electrically connected to an external controller through the signal output port.

[0027] The detection channel circuit, power supply circuit, and detection switching circuit are all connected to an external 24V power supply through signal output ports.

[0028] There are several detection channel circuits, and each detection channel circuit is correspondingly set with a number of AC contactors. The input terminals of the detection channel circuits are electrically connected to the terminals of the corresponding AC contactors through signal input ports.

[0029] The detection switching circuit and several detection channel circuits are all electrically connected to the external controller through signal output ports and receive selection control signals from the external controller.

[0030] This invention features two detection circuits: a leakage current detection circuit and an adhesion detection circuit. The leakage current detection circuit detects whether there is leakage between the AC contactor and the housing, while the adhesion detection circuit detects whether the AC contactor contacts are engaged. A signal input port is connected to the AC contactor to collect its signal. A signal output port is connected to an external controller, receiving channel selection signals and adhesion / leakage current detection switching signals from the external controller, and sending detection result signals from either the adhesion or leakage current detection circuit to the external controller. A detection channel circuit connects the signal input port and the adhesion / leakage current detection circuit, receiving control signals from the external controller to achieve channel selection. The leakage current detection circuit and adhesion detection circuit are connected to a power supply circuit, which requires an external 24V power supply via the power interface of the signal output port.

[0031] The power supply circuit includes a power chip, model WRA2405ST-1WR2. The VIN pin of the power chip is connected to one end of capacitor C1, one end of Zener diode D1, and an external 24V power supply. The GND pin of the power chip, the other end of capacitor C1, and the other end of Zener diode D1 are all grounded. The +V0 pin of the power chip is connected to one end of capacitor C3, one end of resistor R1, an adhesion detection circuit, and a leakage detection circuit. The other end of resistor R1 is connected to the anode of indicator LED1. The -V0 pin of the power chip is connected to one end of capacitor C2 and an adhesion detection circuit. The other ends of capacitor C2, capacitor C3, the OV pin of the power chip, and the cathode of indicator LED1 are all grounded.

[0032] The leakage current detection circuit includes a first operational amplifier chip, model AD8541ARTZ. The +INA pin of the first operational amplifier chip is connected to one end of capacitor C4 and one end of resistor R6, respectively. The other end of capacitor C4 and the V- pin of the first operational amplifier chip are grounded. The other end of resistor R6 is connected to the detection switching circuit and one end of resistor R5, respectively. The other end of resistor R5 and the V+ pin of the first operational amplifier chip are connected to the +V0 pin of the power supply chip. The OUTA pin and -INA pin of the first operational amplifier chip are connected to an external controller through a signal output port.

[0033] The adhesion detection circuit includes an adhesion detection chip and a second operational amplifier chip. The adhesion detection chip is model LTC1966IMS8. The IN1 pin of the adhesion detection chip is connected to one end of resistor R8 and the third port of the current transformer. The IN2 pin of the adhesion detection chip is connected to the other end of resistor R8 and the fourth port of the current transformer. The first port of the current transformer is connected to one end of resistor R7. The other end of resistor R7 is connected to the detection channel circuit and the detection switching circuit. The second port of the current transformer is grounded. The VSS pin of the adhesion detection chip is connected to the -V0 pin of the power supply chip. The VDD pin of the adhesion detection chip and the second operational amplifier chip... The V+ pins of the chip are all connected to the +V0 pin of the power supply chip. The VOUT pin of the adhesion detection chip is connected to one end of capacitor C5 and one end of resistor R9, respectively. The other end of resistor R9 is connected to the +INA pin of the second operational amplifier chip. The V- pin of the second operational amplifier chip, the other end of capacitor C5, and the EN, OUTRIN, and GND pins of the adhesion detection chip are all grounded. The -INA pin of the second operational amplifier chip is connected to one end of resistor R10 and one end of resistor R11, respectively. The other end of resistor R11 is grounded. The other end of resistor R10 and the OUTA pin of the second operational amplifier chip are all connected to the external controller through the signal output port.

[0034] The detection channel circuit includes a relay. The first port of the relay is connected to the terminal of the AC contactor through the signal input port. The fourth port of the relay is connected to one end of the resistor R7 and the detection switching circuit. The second port of the relay is connected to the cathode of the diode D2, one end of the resistor R2, and the external 24V power supply. The other end of the resistor R2 is connected to the anode of the indicator LED2. The cathode of the indicator LED2, the anode of the diode D2, and the third port of the relay are all connected to the collector of the transistor Q1. The base of the transistor Q1 is connected to one end of the resistor R3 and one end of the resistor R4. The other end of the resistor R3 is connected to the external controller through the signal output port. The other end of the resistor R4 and the emitter of the transistor Q1 are both grounded.

[0035] The detection switching circuit includes relays 2 and 3. The first port of relay 2 is connected to one end of resistors R5 and R6, and the fourth port of relay 2 is connected to one end of resistor R7 and the fourth port of relay 1. The second port of relay 2 is connected to the cathode of diode D3, one end of resistor R12, and an external 24V power supply. The other end of resistor R12 is connected to the anode of indicator light LED3. The cathode of indicator light LED3, the anode of diode D3, and the third port of relay 2 are all connected to the anode of diode D4. The first port of relay 3 is connected to the housing of an AC contactor, and the fourth port of relay 3 is grounded. The second port of relay 3 is connected to the cathode of diode D6, one end of resistor R15, and the external 24V power supply. The other end of resistor R15 is connected to the anode of indicator LED4. The cathode of indicator LED4, the anode of diode D6, and the third port of relay 3 are all connected to the anode of diode D5. The cathodes of diodes D4 and D5 are both connected to the collector of transistor Q2. The base of transistor Q2 is connected to one end of resistor R13 and one end of resistor R14. The other end of resistor R13 is connected to the external controller through the signal output port. The other end of resistor R14 and the emitter of transistor Q2 are both grounded.

[0036] For existing technical solutions, the signal to open the detection channel requires a high current. However, this invention adds a transistor to improve the driving capability of the input signal, and the current requirement of the input signal is lower. Furthermore, the adhesion detection part in this invention uses a high-precision chip to ensure the stability of the output signal.

[0037] In use, this invention connects the signal input port on the circuit board to the high-voltage terminal of the high-voltage AC contactor in the electrical control box, and the signal output port on the circuit board to an external controller. When performing adhesion detection or leakage detection on the AC contactor, the signal output port receives the control signal from the external controller, which opens the selected detection channel circuit. The signal input port collects the signal from the AC contactor and inputs it to the switching detection circuit through the detection channel circuit. The switching detection circuit selects either the adhesion detection circuit or the leakage detection circuit to operate. After detection, the adhesion detection circuit or the leakage detection circuit sends a detection signal to the external controller from the signal output terminal, thus realizing the adhesion and leakage detection operation of the AC contactor. Its circuit structure is simple and the cost is low. At the same time, it does not require excessive current to drive when opening the detection channel circuit, and the output of adhesion detection signal and leakage detection signal is more stable, which has great market promotion prospects.

Claims

1. An electrical leakage adhesion detection device comprising a housing, a circuit board disposed within the housing, the device characterized by: The circuit board includes a power supply circuit, an adhesion detection circuit, a leakage current detection circuit, a detection channel circuit, a signal input port, a signal output port, and a detection switching circuit. The power supply circuit is connected to and supplies power to the leakage current detection circuit and the adhesion detection circuit. The input terminal of the detection channel circuit is electrically connected to the terminal of the AC contactor through the signal input port. The output terminal of the detection channel circuit is electrically connected to the input terminals of the leakage current detection circuit and the detection channel circuit through the detection switching circuit. The output terminals of the leakage current detection circuit and the detection channel circuit are both electrically connected to an external controller through the signal output port.

2. The electrical leakage adhesion detection apparatus of claim 1, wherein: The detection channel circuit, power supply circuit, and detection switching circuit are all connected to an external 24V power supply through signal output ports.

3. The electrical leakage adhesion detection apparatus of claim 2, wherein: There are several detection channel circuits, and each detection channel circuit is correspondingly set with a number of AC contactors. The input terminals of the detection channel circuits are electrically connected to the terminals of the corresponding AC contactors through signal input ports.

4. The electrical leakage adhesion detection apparatus of claim 3, wherein: The detection switching circuit and several detection channel circuits are all electrically connected to the external controller through signal output ports and receive selection control signals from the external controller.

5. The electrical leakage adhesion detection apparatus of claim 4, wherein: The power supply circuit includes a power chip. The VIN pin of the power chip is connected to one end of capacitor C1, one end of Zener diode D1, and an external 24V power supply. The GND pin of the power chip, the other end of capacitor C1, and the other end of Zener diode D1 are all grounded. The +V0 pin of the power chip is connected to one end of capacitor C3, one end of resistor R1, an adhesion detection circuit, and a leakage detection circuit. The other end of resistor R1 is connected to the anode of indicator LED1. The -V0 pin of the power chip is connected to one end of capacitor C2 and an adhesion detection circuit. The other ends of capacitor C2, capacitor C3, the 0V pin of the power chip, and the cathode of indicator LED1 are all grounded.

6. The electrical leakage adhesion detection apparatus of claim 5, wherein: The leakage current detection circuit includes a first operational amplifier chip. The +INA pin of the first operational amplifier chip is connected to one end of capacitor C4 and one end of resistor R6, respectively. The other end of capacitor C4 and the V- pin of the first operational amplifier chip are grounded. The other end of resistor R6 is connected to the detection switching circuit and one end of resistor R5, respectively. The other end of resistor R5 and the V+ pin of the first operational amplifier chip are connected to the +V0 pin of the power supply chip. The OUTA pin and -INA pin of the first operational amplifier chip are connected to an external controller through a signal output port.

7. The electrical leakage adhesion detection apparatus of claim 6, wherein: The adhesion detection circuit includes an adhesion detection chip and a second operational amplifier chip. The IN1 pin of the adhesion detection chip is connected to one end of resistor R8 and the third port of the current transformer. The IN2 pin of the adhesion detection chip is connected to the other end of resistor R8 and the fourth port of the current transformer. The first port of the current transformer is connected to one end of resistor R7, and the other end of resistor R7 is connected to the detection channel circuit and the detection switching circuit. The second port of the current transformer is grounded. The VSS pin of the adhesion detection chip is connected to the -V0 pin of the power supply chip. The VDD pin of the adhesion detection chip and the V+ pin of the second operational amplifier chip are both connected to the power supply chip. The +V0 pin of the chip is connected to the adhesion detection chip. The VOUT pin of the adhesion detection chip is connected to one end of capacitor C5 and one end of resistor R9. The other end of resistor R9 is connected to the +INA pin of the second operational amplifier chip. The V- pin of the second operational amplifier chip, the other end of capacitor C5, and the EN, OUTRIN, and GND pins of the adhesion detection chip are all grounded. The -INA pin of the second operational amplifier chip is connected to one end of resistor R10 and one end of resistor R11. The other end of resistor R11 is grounded. The other end of resistor R10 and the OUTA pin of the second operational amplifier chip are connected to an external controller through a signal output port.

8. The electrical leakage adhesion detection apparatus of claim 7, wherein: The detection channel circuit includes a relay 1. The first port of the relay 1 is connected to the terminal of the AC contactor through a signal input port. The fourth port of the relay 1 is connected to one end of the resistor R7 and the detection switching circuit. The second port of the relay 1 is connected to the cathode of the diode D2, one end of the resistor R2, and the external 24V power supply. The other end of the resistor R2 is connected to the anode of the indicator LED2. The cathode of the indicator LED2, the anode of the diode D2, and the third port of the relay 1 are all connected to the collector of the transistor Q1. The base of the transistor Q1 is connected to one end of the resistor R3 and one end of the resistor R4. The other end of the resistor R3 is connected to the external controller through a signal output port. The other end of the resistor R4 and the emitter of the transistor Q1 are both grounded.

9. The electrical leakage adhesion detection apparatus of claim 8, wherein: The detection switching circuit includes relays 2 and 3. The first port of relay 2 is connected to one end of resistors R5 and R6, and the fourth port of relay 2 is connected to one end of resistor R7 and the fourth port of relay 1. The second port of relay 2 is connected to the cathode of diode D3, one end of resistor R12, and an external 24V power supply. The other end of resistor R12 is connected to the anode of indicator light LED3. The cathode of indicator light LED3, the anode of diode D3, and the third port of relay 2 are all connected to the anode of diode D4. The first port of relay 3 is connected to the housing of an AC contactor, and the fourth port of relay 3 is grounded. The second port of relay 3 is connected to the cathode of diode D6, one end of resistor R15, and the external 24V power supply. The other end of resistor R15 is connected to the anode of indicator LED4. The cathode of indicator LED4, the anode of diode D6, and the third port of relay 3 are all connected to the anode of diode D5. The cathodes of diodes D4 and D5 are both connected to the collector of transistor Q2. The base of transistor Q2 is connected to one end of resistor R13 and one end of resistor R14. The other end of resistor R13 is connected to the external controller through the signal output port. The other end of resistor R14 and the emitter of transistor Q2 are both grounded.

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