阅读说明：本技术 一种多回路可复用型漏电闭锁装置 (Multi-loop reusable leakage locking device ) 是由 王东峰 张伟杰 徐文凯 马建江 于 2021-09-18 设计创作，主要内容包括：本申请公开了一种多回路可复用型漏电闭锁装置,包括单片机,单片机连接有AD转换单元、开关量输入单元、电源单元、显示单元和开关量输出单元,AD转换单元连接有电压检测单元,开关量输入单元连接有漏电检测单元。具有以下优点：可供多回路复用,在降低成本的同时提高了装置的可靠性；设计的漏电检测电路能够有效避免高压窜入,滞回特性的引入又保证了漏电检测的灵敏性和抗干扰性。(The application discloses multiplex type electric leakage blocking device of multiloop, including the singlechip, the singlechip is connected with AD converting unit, switching value input unit, power supply unit, display element and switching value output unit, and AD converting unit is connected with voltage detection unit, and switching value input unit is connected with electric leakage detection unit. Has the following advantages: the device can be used for multi-loop multiplexing, so that the cost is reduced, and the reliability of the device is improved; the designed leakage detection circuit can effectively avoid high-voltage channeling, and the introduction of hysteresis characteristics ensures the sensitivity and anti-interference of leakage detection.)

1. A kind of multi-loop reusable leakage locking device, characterized by that: the device comprises a single chip microcomputer, wherein the single chip microcomputer is connected with an AD conversion unit, a switching value input unit, a power supply unit, a display unit and a switching value output unit;

the single chip microcomputer comprises a chip U11, and the model of the chip U11 is STC89C 52;

the voltage detection unit comprises an amplifier U1, wherein a pin 1 of the amplifier U1 is connected with one end of a resistor R1 and one end of an adjustable resistor R2, the other end of the resistor R1 serves as an input end and is used for being connected with a motor, a pin 2 of the amplifier U1 is connected with one end of a resistor R4, one end of a capacitor C1 and one end of a resistor R5, the other end of a capacitor C1 and the other end of the resistor R5 are grounded, the other end of the resistor R4 is connected with a pin 7 of the amplifier U1 and is connected with a VCC power supply, the other end of the adjustable resistor R2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with a pin 3 of the amplifier U1 and one end of a capacitor C2, the other end of the capacitor C2 is connected with one end of a resistor R6 and one end of the resistor R7, and the other end of the resistor R6 is connected with a pin 5 of the amplifier U2, one end of a diode D1 and one end of a resistor R8.

2. The multi-loop reusable leakage blocking device of claim 1, wherein: the other end of the amplifier U2 is connected with the other end of a diode D1 and one end of a diode D2, the other end of the diode D2 is connected with the other end of a resistor R8 and one end of a resistor R9, the other end of a resistor R9 is connected with the 9 pin of the amplifier U4, one end of a resistor R10 and the other end of a resistor R7, the 8 pin of the amplifier U4 is connected with the other end of a resistor R10 and one end of a resistor R11, the other end of the resistor R11 is connected with one end of a resistor R12 and one end of a capacitor C4, the other end of the resistor R12 is connected with one end of a capacitor C3 and the 12 pin of the amplifier U3, the 13 pin of the amplifier U3 is connected with one end of a resistor R13 and one end of a resistor R14, the other end of the resistor R14, the other end of the capacitor C3 and the 10 pin of the amplifier U4 are grounded, the other end of the resistor R13 and the other end of the resistor C4 are connected with the 11 pin of the amplifier U3 and serve as an output end for connecting with the input end of the AD conversion unit.

3. The multi-loop reusable leakage blocking device of claim 1, wherein: the AD conversion unit comprises a chip U12, the model of the chip U12 is ADS7805, a pin 1 of the chip U12 is connected with one end of a resistor R31 and one end of a resistor R32, the other end of the resistor R31 is connected with an output end of a voltage detection unit, a pin 3 of the chip U12 is connected with one end of a capacitor C38 and one end of a resistor R33, the other end of the resistor R33 is connected with one end of a resistor R35 and one end of a resistor R37, the other end of the resistor R35 is connected with one end of a resistor R35 and the other end of the chip U35, the other end of the resistor R35 is connected with one end of a resistor R35, the other end of the resistor R35, one end of the capacitor C35 and the other end of the chip U35, the other end of the resistor R35, the other end of the capacitor C35 and the other end of the capacitor C35 are grounded, one end of the capacitor C35 is connected with one end of the resistor C35 and one end of the capacitor C35.

4. A multi-loop reusable leakage blocking device as claimed in claim 3, wherein: the AD conversion unit further comprises a chip U13 and a chip U14, the type of the chip U13 is 74fct16373, the type of the chip U14 is 74ABT16245/SO, the pin 47 of the chip U14 is connected with the pin 22 of the chip U14, the pin 46 of the chip U14 is connected with the pin 21 of the chip U14, the pin 44 of the chip U14 is connected with the pin 20 of the chip U14, the pin 43 of the chip U14 is connected with the pin 19 of the chip U14, the pin 41 of the chip U14 is connected with the pin 18 of the chip U14, the pin 40 of the chip U14 is connected with the pin 17 of the chip U14, the pin 38 of the chip U14 is connected with the pin 16 of the chip U14, the pin 37 of the chip U14 is connected with the pin 15 of the chip U14, the pin 36 of the chip U14 is connected with the pin 13 of the chip U14, the pin 35 of the chip U14 is connected with the pin 12 of the chip U14, the pin 33 of the chip U14 is connected with the pin 30 of the chip U14, the chip U14 is connected with the pin of the chip U14, the chip U14 is connected with the pin 30 of the chip U14, the pin 27 of the chip U13 is connected to the pin 7 of the chip U12, and the pin 26 of the chip U13 is connected to the pin 6 of the chip U12.

5. The multi-loop reusable leakage blocking device of claim 4, wherein: pin 2 of the chip U13 is connected to pin 47 of chip U14, pin 3 of chip U13 is connected to pin 46 of chip U14, pin 5 of chip U14 is connected to pin 44 of chip U14, pin 6 of chip U14 is connected to pin 43 of chip U14, pin 8 of chip U14 is connected to pin 41 of chip U14, pin 9 of chip U14 is connected to pin 40 of chip U14, pin 11 of chip U14 is connected to pin 38 of chip U14, pin 12 of chip U14 is connected to pin 37 of chip U14, pin 13 of chip U14 is connected to pin 36 of chip U14, pin 14 of chip U14 is connected to pin 35 of chip U14, pin 16 of chip U14 is connected to pin 33 of chip U14, pin 17 of chip U14 is connected to pin 32 of chip U14, pin 19 of chip U14 is connected to pin 30 of chip U14, pin 20 of chip U14 is connected to pin 33 of chip U3629, and pin 14 is connected to pin 3623 of chip U14.

6. A multi-loop reusable leakage blocking device as claimed in claim 3, wherein: the pin 2 of the chip U14 is connected with the pin 39 of the chip U11, the pin 3 of the chip U14 is connected with the pin 38 of the chip U11, the pin 5 of the chip U11 is connected with the pin 37 of the chip U11, the pin 6 of the chip U11 is connected with the pin 36 of the chip U11, the pin 8 of the chip U11 is connected with the pin 35 of the chip U11, the pin 9 of the chip U11 is connected with the pin 34 of the chip U11, the pin 11 of the chip U11 is connected with the pin 33 of the chip U11, the pin 12 of the chip U11 is connected with the pin 32 of the chip U11, the pin 13 of the chip U11 is connected with the pin 21 of the chip U11, the pin 14 of the chip U11 is connected with the pin 22 of the chip U11, the pin 16 of the chip U11 is connected with the pin 23 of the chip U11, the pin 17 of the chip U11 is connected with the pin 24 of the chip U11, the pin 19 of the chip U11 is connected with the pin 25 of the chip U11, the pin 20 of the chip U11 is connected with the pin 3628, and the pin 11 of the chip U11 is connected with the pin 11.

7. The multi-loop reusable leakage blocking device of claim 1, wherein: the leakage detection unit comprises a relay KV1, one end of a coil of the relay KV1 is connected with one end of a diode D21 and one end of a CON, the other end of a coil of the relay KV1 and the other end of a diode D21 are grounded, one end of a normally closed contact of the relay KV1 is connected with one end of a resistor R21, one end of a resistor R22 and one end of a resistor R23, the other end of the resistor R21 is connected with one end of a resistor Rx, the other end of the resistor Rx and the other end of the normally closed contact of the relay KV1 are grounded, the other end of the resistor R23 is connected with one end of a capacitor C21 and one end of a pin 1 of an amplifier U5, a pin 3 of an amplifier U5 is connected with one end of a resistor R27 and one end of a capacitor C22, the other end of the resistor R27 is connected with a VCC power supply, the other end of the capacitor C22 is grounded, a pin 2 of the amplifier U5 is connected with the other end of a capacitor C21 and one end of a resistor R24, the other end of the resistor R24 is connected with the normally open contact of the KV relay 24, and the normally open contact of the relay 24 is connected with a normally open power supply, one end of a coil of the relay KV2 is connected with one end of a diode D22 and connected with a CON end.

8. The multi-loop reusable leakage blocking device of claim 7, wherein: the other end of the diode D22 and the other end of the coil of the relay KV2 are grounded, the resistor R24 is also connected with one end of a resistor R25, the other end of the resistor R25 is connected with one end of an adjustable resistor R26 and the 11 feet of an amplifier U8, the other end of the adjustable resistor R26 is grounded, a pin 13 of the amplifier U8 is connected with one end of a diode D23, the other end of the diode D23 is connected with one end of a resistor R31, the other end of the resistor R11 is connected with a VCC power supply, a pin 12 of the amplifier U8 is connected with one end of a resistor R28, one end of a resistor R29, a pin 4 of the amplifier U6 and a pin 9 of the amplifier U7, the other end of the resistor R28 is connected with the VCC power supply, the other end of the resistor R29 is grounded, a pin 8 of the amplifier U7 is connected with one end of a resistor R30, the OUTPUT end is used for connecting a motor, the other end of the resistor R30 and the pin 7 of the amplifier U7 are connected with a VCC power supply, the pin 10 of the amplifier U7, the pin 13 of the amplifier U8 and the pin 6 of the amplifier U6 are connected with one end of a capacitor C23, and the other end of the capacitor C23 is grounded.

9. The multi-loop reusable leakage blocking device of claim 1, wherein: the switching value input unit comprises a chip U9, the model of the chip U9 is TLP180, a pin 1 of the chip U9 is connected with one end of a diode D11, one end of a capacitor C25 and one end of a resistor R41, the other end of a resistor R41 is connected with one end of a capacitor C20 and one end of a resistor R30, the other end of a resistor R30 is connected with a CON end of a leakage detection unit, the other end of the capacitor C20, the other end of the capacitor C25 and the other end of the diode D11 are grounded, a pin 6 of the chip U9 is connected with one end of a resistor R32 and a pin 12 of the chip U11, the other end of the resistor R32 is connected with +50V, and a pin 4 of the chip U9 is grounded.

10. The multi-loop reusable leakage blocking device of claim 1, wherein: the switching value output unit comprises a chip U20, the model of the chip U20 is TILP127, a pin 1 of the chip U20 is connected with one end of a resistor R50, the other end of the resistor R50 is connected with a pin 13 of the chip U11, a pin 4 of the chip U20 is connected with one end of a resistor R52, the other end of the resistor R52 is connected with one end of a resistor R53 and the base of a triode Q1, the other end of the resistor R53 and the emitter of the triode Q1 are grounded, the collector of the triode Q1 is connected with one end of a diode D51 and one end of a coil of a relay KV3, a pin 6 of the chip U20, the other end of the diode D51 and the other end of the coil of the relay KV3 are connected with a VCC power supply, one end of a switch KV3 is connected with one end of an inductor FA and one end of a piezoresistor R54, and the other end of the inductor FA and the other end of the piezoresistor R54 are grounded.

Technical Field

The invention discloses a multi-loop reusable leakage locking device, and belongs to the technical field of electronic control.

Background

Under complex electrical environments such as cable wells and the like, the cable wells are often relatively wet, the working conditions are complex, and electric leakage accidents are easy to happen. Since selective earth leakage protection of a system without grounding a neutral point is difficult to realize, the influence range and the processing time of a fault are reduced by adopting an earth leakage locking mode, and the importance of the earth leakage protection is not negligible.

At present, a leakage detection part in a leakage locking device is generally realized by using a voltage comparator with higher sensitivity, but the anti-interference capability of the leakage locking device is poor, and the output voltage possibly jumps due to the tiny fluctuation of the voltage near a conversion threshold value, so that the device malfunctions, electric sparks are generated due to the shaking of a relay, and certain potential safety hazards exist. In addition, the leakage detection circuit is usually isolated from the main circuit through a high-voltage reed switch relay, but the reed switch relay has poor anti-electromagnetic interference capability, and particularly in a complex electromagnetic environment, the leakage detection circuit is easily damaged by high-voltage leap due to error attraction, and certain threat is formed on the safety of personnel and electrical equipment.

The existing technical scheme is mostly in a power-off detection mode, namely, after a certain time delay occurs after the main loop is powered off, the main loop and the electric leakage locking device are switched on, and electric leakage detection is carried out on the main loop; when the main loop is connected, the normally closed contact of the intermediate relay and the normally closed contact of the main loop contactor are used for cutting off the leakage blocking detection loop, and each main loop needs to be provided with a set of leakage detection device.

However, the power failure detection method has the following problems:

1. each main loop needs to be provided with a set of leakage detection device, and the device is complex and wastes time and labor;

2. when the motor is frequently started, if the power-off delay time is not reached, the electric leakage locking device is not switched in for detection, and the phenomenon of detection leakage is easy to occur;

3. the high voltage of the main circuit is easily led into the leakage locking device due to the hysteresis action of the normally closed contact of the contactor or the intermediate relay, and the device is burnt;

4. the main loop operating frequency cannot be limited and for some large power plants that do not allow frequent start-up, human damage may occur.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a multi-loop reusable leakage locking device for multi-loop reuse, which can reduce the cost and improve the reliability of the device; the designed leakage detection circuit can effectively avoid high-voltage channeling, and the introduction of hysteresis characteristics ensures the sensitivity and anti-interference of leakage detection.

In order to solve the technical problems, the invention adopts the following technical scheme:

a multi-loop reusable electric leakage locking device comprises a single chip microcomputer, wherein the single chip microcomputer is connected with an AD conversion unit, a switching value input unit, a power supply unit, a display unit and a switching value output unit;

the single chip microcomputer comprises a chip U11, and the model of the chip U11 is STC89C 52;

the voltage detection unit comprises an amplifier U1, wherein a pin 1 of the amplifier U1 is connected with one end of a resistor R1 and one end of an adjustable resistor R2, the other end of the resistor R1 serves as an input end and is used for being connected with a motor, a pin 2 of the amplifier U1 is connected with one end of a resistor R4, one end of a capacitor C1 and one end of a resistor R5, the other end of a capacitor C1 and the other end of the resistor R5 are grounded, the other end of the resistor R4 is connected with a pin 7 of the amplifier U1 and is connected with a VCC power supply, the other end of the adjustable resistor R2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with a pin 3 of the amplifier U1 and one end of a capacitor C2, the other end of the capacitor C2 is connected with one end of a resistor R6 and one end of the resistor R7, and the other end of the resistor R6 is connected with a pin 5 of the amplifier U2, one end of a diode D1 and one end of a resistor R8.

Furthermore, the other end of the diode D1 and one end of the diode D2 are connected to a pin 6 of the amplifier U2, the other end of the diode D2 is connected to the other end of the resistor R8 and one end of the resistor R9, the other end of the resistor R9 is connected to a pin 9 of the amplifier U4, one end of the resistor R10 and the other end of the resistor R7, the other end of the amplifier U4 is connected to the other end of the resistor R10 and one end of the resistor R11, the other end of the resistor R11 is connected to one end of the resistor R12 and one end of the capacitor C4, the other end of the resistor R12 is connected to one end of the capacitor C3 and a pin 12 of the amplifier U3, a pin 13 of the amplifier U3 is connected to one end of the resistor R13 and one end of the resistor R14, the other end of the resistor R14, the other end of the capacitor C3 and a pin 10 of the amplifier U4 are grounded, the other end of the resistor R13 and the other end of the resistor C4 are connected to a pin 11 of the amplifier U3 and serve as output end for connecting an input end of the AD conversion unit.

Further, the AD conversion unit includes a chip U12, the model of the chip U12 is ADs7805, pin 1 of the chip U12 is connected with one end of a resistor R31 and one end of a resistor R32, the other end of the resistor R31 is connected with an output end of the voltage detection unit, pin 3 of the chip U12 is connected with one end of a capacitor C38 and one end of a resistor R33, the other end of the resistor R33 is connected with one end of a resistor R35 and one end of a resistor R37, the other end of the resistor R35 is connected with one end of a resistor R35 and a pin 27 of the chip U35, the other end of the resistor R35 is connected with one end of a resistor R35, the other end of the resistor R35, one end of the capacitor C35 and a pin 4 of the chip U35, the other end of the resistor R35, the other end of the capacitor C35 and the other end of the capacitor C35 are all grounded, and the pin 27 of the capacitor C35 are connected with one end of the terminal of the capacitor C35 and one end of the capacitor C35.

Further, the AD conversion unit further includes a chip U13 and a chip U14, the type of the chip U13 is 74fct16373, the type of the chip U14 is 74ABT16245/SO, the pin 47 of the chip U14 is connected with the pin 22 of the chip U14, the pin 46 of the chip U14 is connected with the pin 21 of the chip U14, the pin 44 of the chip U14 is connected with the pin 20 of the chip U14, the pin 43 of the chip U14 is connected with the pin 19 of the chip U14, the pin 41 of the chip U14 is connected with the pin 18 of the chip U14, the pin 40 of the chip U14 is connected with the pin 17 of the chip U14, the pin 38 of the chip U14 is connected with the pin 16 of the chip U14, the pin 37 of the chip U14 is connected with the pin 15 of the chip U14, the pin 36 of the chip U14 is connected with the pin 13 of the chip U14, the pin 35 of the chip U14 is connected with the pin 12 of the chip U14, the pin 33 of the chip U14 is connected with the pin 10 of the chip U14, the pin 14 is connected with the pin 10 of the chip U14, and the pin of the chip U14, the pin 27 of the chip U13 is connected to the pin 7 of the chip U12, and the pin 26 of the chip U13 is connected to the pin 6 of the chip U12.

Furthermore, pin 2 of the chip U13 is connected to pin 47 of chip U14, pin 3 of the chip U13 is connected to pin 46 of the chip U14, pin 5 of the chip U14 is connected to pin 44 of the chip U14, pin 6 of the chip U14 is connected to pin 43 of the chip U14, pin 8 of the chip U14 is connected to pin 41 of the chip U14, pin 9 of the chip U14 is connected to pin 40 of the chip U14, pin 11 of the chip U14 is connected to pin 38 of the chip U14, pin 12 of the chip U14 is connected to pin 37 of the chip U14, pin 13 of the chip U14 is connected to pin 36 of the chip U14, pin 14 of the chip U14 is connected to pin 35 of the chip U14, pin 16 of the chip U14 is connected to pin 33 of the chip U14, pin 17 of the chip U14 is connected to pin 32 of the chip U14, pin 19 of the chip U14 is connected to pin 30 of the chip U14, pin 20 of the chip U14 is connected to pin 14, and pin 20 of the chip U14 is connected to pin 3623 of the chip U14.

Furthermore, pin 2 of the chip U14 is connected to pin 39 of chip U11, pin 3 of the chip U14 is connected to pin 38 of the chip U11, pin 5 of the chip U11 is connected to pin 37 of the chip U11, pin 6 of the chip U11 is connected to pin 36 of the chip U11, pin 8 of the chip U11 is connected to pin 35 of the chip U11, pin 9 of the chip U11 is connected to pin 34 of the chip U11, pin 11 of the chip U11 is connected to pin 33 of the chip U11, pin 12 of the chip U11 is connected to pin 32 of the chip U11, pin 13 of the chip U11 is connected to pin 21 of the chip U11, pin 14 of the chip U11 is connected to pin 22 of the chip U11, pin 16 of the chip U11 is connected to pin 23 of the chip U11, pin 17 of the chip U11 is connected to pin 24 of the chip U11, pin 19 of the chip U11 is connected to pin 25 of the chip U11, pin 20 of the chip U11 is connected to pin 11, and pin 20 of the chip U11 is connected to pin 11.

Further, the leakage detection unit comprises a relay KV1, one end of a coil of the relay KV1 is connected with one end of a diode D21 and one end of a CON, the other end of a coil of the relay KV1 and the other end of a diode D21 are grounded, one end of a normally closed contact of the relay KV1 is connected with one end of a resistor R21, one end of a resistor R22 and one end of a resistor R23, the other end of a resistor R21 is connected with one end of a resistor Rx, the other end of the resistor Rx and the other end of the normally closed contact of the relay KV1 are grounded, the other end of the resistor R23 is connected with one end of a capacitor C21 and one end of a pin 1 of an amplifier U5, a pin 3 of an amplifier U5 is connected with one end of a resistor R27 and one end of a capacitor C22, the other end of the resistor R27 is connected with a VCC power supply, the other end of the capacitor C22 is grounded, a pin 2 of the amplifier U5 is connected with the other end of a capacitor C21 and one end of a resistor R24, the other end of the resistor R24 is connected with a normally open contact of the relay KV 24, and the other end of the normally open contact of the relay KV 24 is connected with another VCC power supply, one end of a coil of the relay KV2 is connected with one end of a diode D22 and connected with a CON end.

Further, the other end of the diode D22 and the other end of the coil of the relay KV2 are grounded, the resistor R24 is further connected with one end of a resistor R25, the other end of the resistor R25 is connected with one end of an adjustable resistor R26 and the 11 pin of the amplifier U8, the other end of the adjustable resistor R26 is grounded, the 13 pin of the amplifier U8 is connected with one end of a diode D23, the other end of a diode D23 is connected with one end of a resistor R31, the other end of the resistor R11 is connected with a VCC power supply, the 12 pin of the amplifier U8 is connected with one end of a resistor R28, one end of a resistor R29, the 4 pin of the amplifier U29 and the 9 pin of the amplifier U29, the other end of the resistor R29 is connected with a VCC power supply, the other end of the resistor R29 is grounded, the 8 pin of the amplifier U29 is connected with one end of a resistor R29 and serves as an OUTPUT end, the pout end, the puutt end is used for connecting a motor, the other end of the resistor R29 and the 7 pin of the amplifier U29 are connected with a VCC power supply, the pin of the 10 pin of the amplifier U29, the other end of the capacitor C23 is grounded.

Further, the switching value input unit comprises a chip U9, the model of the chip U9 is TLP180, pin 1 of the chip U9 is connected with one end of a diode D11, one end of a capacitor C25 and one end of a resistor R41, the other end of a resistor R41 is connected with one end of a capacitor C20 and one end of a resistor R30, the other end of a resistor R30 is connected with a CON end of the leakage detection unit, the other end of the capacitor C20, the other end of the capacitor C25 and the other end of the diode D11 are grounded, pin 6 of the chip U9 is connected with one end of a resistor R32 and 12 pins of the chip U11, the other end of the resistor R32 is connected with +50V, and pin 4 of the chip U9 is grounded.

Furthermore, the switching value output unit comprises a chip U20, the model of the chip U20 is TILP127, a pin 1 of the chip U20 is connected with one end of a resistor R50, the other end of the resistor R50 is connected with a pin 13 of the chip U11, a pin 4 of the chip U20 is connected with one end of a resistor R52, the other end of the resistor R52 is connected with one end of a resistor R53 and the base of a triode Q1, the other end of the resistor R53 is grounded with the emitter of the triode Q1, the collector of the triode Q1 is connected with one end of a diode D51 and one end of a coil of a relay KV3, a pin 6 of the chip U20, the other end of the diode D51 and the other end of the coil of the relay KV3 are connected with a VCC power supply, one end of a switch of the relay 3 is connected with one end of an inductor FA and one end of a piezoresistor R54, and the other end of the inductor FA and the other end of the piezoresistor R54 are grounded.

By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

the designed leakage locking device adopts a control mode of starting detection, can be used for multi-loop multiplexing, reduces the cost and improves the reliability of the device; the designed leakage detection circuit can effectively avoid high-voltage channeling, and the introduction of hysteresis characteristics ensures the sensitivity and anti-interference of leakage detection; the PLC226CN is used as a control core, so that the device can reliably work in an electromagnetic environment with complex working conditions.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a block diagram of the leakage blocking device of the present invention;

FIG. 2 is a schematic circuit diagram of a voltage detection unit according to the present invention;

FIG. 3 is a schematic circuit diagram of the leakage detecting unit according to the present invention;

FIG. 4 is a schematic circuit diagram of a single-chip microcomputer according to the present invention;

FIG. 5 is a schematic circuit diagram of an AD conversion unit according to the present invention;

FIG. 6 is a schematic circuit diagram of the switching value input unit according to the present invention;

fig. 7 is a schematic circuit diagram of the switching value output unit of the present invention.

Detailed Description

Embodiment 1, as shown in fig. 1, a multi-loop reusable electric leakage locking device, including the singlechip, the singlechip is connected with AD conversion unit, switching value input unit, the electrical unit, display element and switching value output unit, AD conversion unit is connected with voltage detection unit, switching value input unit is connected with electric leakage detection unit, voltage detection unit is used for detecting the back electromotive force of motor after the motor stops, avoid voltage to scurry into electric leakage detection unit damage device, electric leakage detection unit is used for before supplying power for the motor, detect the insulating condition to ground of power supply line and motor, if the electric leakage phenomenon then realize electric leakage locking function.

As shown in fig. 4, the single chip microcomputer includes a chip U11, and the model of the chip U11 is STC89C 52.

As shown in fig. 2, the voltage detecting unit includes an amplifier U1, a pin 1 of the amplifier U1 is connected to one end of a resistor R1 and one end of an adjustable resistor R2, the other end of the resistor R1 is used as an input end for connecting with a motor, a pin 2 of the amplifier U1 is connected to one end of a resistor R4, one end of a capacitor C4 and one end of a resistor R4, the other end of the capacitor C4 and the other end of the resistor R4 are grounded, the other end of the resistor R4 is connected to a pin 7 of the amplifier U4 and connected to a VCC power supply, the other end of the adjustable resistor R4 is connected to one end of a resistor R4, the other end of the resistor R4 is connected to one end of a pin 3 of the amplifier U4 and one end of the capacitor C4, the other end of the capacitor C4 is connected to one end of the resistor R4 and one end of the resistor R4, a pin 6 of the amplifier U4 is connected to the other end of a diode D4 and one end of the diode D4, the other end of the resistor R9 is connected with a pin 9 of an amplifier U4, one end of a resistor R10 and the other end of a resistor R7, a pin 8 of the amplifier U4 is connected with the other end of a resistor R10 and one end of a resistor R11, the other end of the resistor R11 is connected with one end of a resistor R12 and one end of a capacitor C4, the other end of the resistor R12 is connected with one end of a capacitor C3 and a pin 12 of the amplifier U3, a pin 13 of the amplifier U3 is connected with one end of a resistor R13 and one end of a resistor R14, the other end of the resistor R14, the other end of the capacitor C3 and a pin 10 of the amplifier U4 are grounded, and the other end of the resistor R13 and the other end of the resistor C4 are connected with a pin 11 of the amplifier U3 and serve as an output end for being connected with an input end of the AD conversion unit.

After the main loop is powered off, the motor can continue to rotate for a period of time due to the inertia effect, and during the period, induced potential exists in the loop, and if the missed detection circuit is put into operation, the detection device can be damaged due to high-voltage channeling. Therefore, it is necessary to perform residual voltage detection on the main circuit before leakage detection, and the detection circuit is as shown in fig. 1. Because the voltage signal of the primary side voltage after being converted by the voltage transformer is weak, the design adopts an amplification-rectification-filtering mode to convert the primary side voltage into a direct current signal so as to be convenient for acquisition and processing. The adjusting resistor R2 can make the output dc signal output in a certain proportion of the original signal or in the same proportion.

As shown in fig. 5, the AD conversion unit includes a chip U12, the model of the chip U12 is ADs7805, pin 1 of the chip U12 is connected to one end of a resistor R31 and one end of a resistor R32, the other end of the resistor R31 is connected to an output end of the voltage detection unit, pin 3 of the chip U12 is connected to one end of a capacitor C38 and one end of a resistor R33, the other end of the resistor R33 is connected to one end of a resistor R35 and one end of a resistor R37, the other end of the resistor R35 is connected to one end of a resistor R35 and the other end of the chip U35, the other end of the resistor R35 is connected to one end of a resistor R35, the other end of the capacitor C35 and the 4 of the chip U35, the other end of the resistor R35, the other end of the capacitor C35 and the other end of the capacitor C35 are all grounded, and the pin 27 of the chip U35 is connected to one end of the capacitor C35 and one end of the capacitor C35 is grounded.

As shown in fig. 5, the AD conversion unit further includes a chip U13 and a chip U14, the type of the chip U13 is 74fct16373, the type of the chip U14 is 74ABT16245/SO, the pin 47 of the chip U14 is connected to the pin 22 of the chip U14, the pin 46 of the chip U14 is connected to the pin 21 of the chip U14, the pin 44 of the chip U14 is connected to the pin 20 of the chip U14, the pin 43 of the chip U14 is connected to the pin 19 of the chip U14, the pin 41 of the chip U14 is connected to the pin 18 of the chip U14, the pin 40 of the chip U14 is connected to the pin 17 of the chip U14, the pin 38 of the chip U14 is connected to the pin 16 of the chip U14, the pin 37 of the chip U14 is connected to the pin 15 of the chip U14, the pin 36 of the chip U14 is connected to the pin 36 of the pin 14, the pin 35 of the chip U14 is connected to the pin 12 of the chip U14, the pin 33 of the chip U14 is connected to the pin 10 of the chip U14, the pin 14 is connected to the pin of the chip U14, and the pin 10 of the chip U14 is connected to the chip U14, the pin 27 of the chip U13 is connected to the pin 7 of the chip U12, and the pin 26 of the chip U13 is connected to the pin 6 of the chip U12.

Pin 2 of the chip U13 is connected to pin 47 of chip U14, pin 3 of chip U13 is connected to pin 46 of chip U14, pin 5 of chip U14 is connected to pin 44 of chip U14, pin 6 of chip U14 is connected to pin 43 of chip U14, pin 8 of chip U14 is connected to pin 41 of chip U14, pin 9 of chip U14 is connected to pin 40 of chip U14, pin 11 of chip U14 is connected to pin 38 of chip U14, pin 12 of chip U14 is connected to pin 37 of chip U14, pin 13 of chip U14 is connected to pin 36 of chip U14, pin 14 of chip U14 is connected to pin 35 of chip U14, pin 16 of chip U14 is connected to pin 33 of chip U14, pin 17 of chip U14 is connected to pin 32 of chip U14, pin 19 of chip U14 is connected to pin 30 of chip U14, pin 20 of chip U14 is connected to pin 33 of chip U3629, and pin 14 is connected to pin 3623 of chip U14.

The pin 2 of the chip U14 is connected with the pin 39 of the chip U11, the pin 3 of the chip U14 is connected with the pin 38 of the chip U11, the pin 5 of the chip U11 is connected with the pin 37 of the chip U11, the pin 6 of the chip U11 is connected with the pin 36 of the chip U11, the pin 8 of the chip U11 is connected with the pin 35 of the chip U11, the pin 9 of the chip U11 is connected with the pin 34 of the chip U11, the pin 11 of the chip U11 is connected with the pin 33 of the chip U11, the pin 12 of the chip U11 is connected with the pin 32 of the chip U11, the pin 13 of the chip U11 is connected with the pin 21 of the chip U11, the pin 14 of the chip U11 is connected with the pin 22 of the chip U11, the pin 16 of the chip U11 is connected with the pin 23 of the chip U11, the pin 17 of the chip U11 is connected with the pin 24 of the chip U11, the pin 19 of the chip U11 is connected with the pin 25 of the chip U11, the pin 20 of the chip U11 is connected with the pin 3628, and the pin 11 of the chip U11 is connected with the pin 11.

The highest conversion frequency of the AD conversion unit reaches 100kHz, the stability of the system is greatly improved, the ADS7805 outputs the conversion result to a data bus, and although the conversion result is 16 bits, the conversion result does not need to be read in twice for a single chip microcomputer with a 16-bit data bus.

As shown in fig. 3, the leakage detecting unit includes a relay KV1, one end of a coil of the relay KV1 is connected with one end of a diode D21 and one end of a CON, the other end of a coil of the relay KV1 and the other end of the diode D21 are grounded, one end of a normally closed contact of the relay KV1 is connected with one end of a resistor R21, one end of a resistor R22 and one end of a resistor R23, the other end of a resistor R21 is connected with one end of a resistor Rx, the other end of the resistor Rx and the other end of the normally closed contact of the relay KV1 are grounded, the other end of the resistor R23 is connected with one end of a capacitor C21 and one end of a pin 5 of an amplifier U5, the 3 pin of the amplifier U5 is connected with one end of a resistor R27 and one end of a capacitor C22, the other end of the resistor R27 is connected with a VCC power supply, the other end of the capacitor C22 is grounded, the 2 pin of the amplifier U5 is connected with the other end of a capacitor C21 and one end of a resistor R24, the other end of the normally open contact of the relay KV 24 is connected with another VCC power supply, one end of a coil of the relay KV2 is connected with one end of a diode D22 and connected with a CON end, the other end of the diode D22 and the other end of the coil of the relay KV2 are grounded, the resistor R24 is also connected with one end of a resistor R25, the other end of the resistor R25 is connected with one end of an adjustable resistor R26 and a pin 11 of the amplifier U8, the other end of the adjustable resistor R26 is grounded, a pin 13 of the amplifier U26 is connected with one end of a diode D26, the other end of the diode D26 is connected with one end of a resistor R26, the other end of the resistor R26 is connected with a power supply, the pin 12 of the amplifier U26 is connected with one end of a resistor R26, one end of the resistor R26, a pin 4 of the amplifier U26 and a pin 9 of the amplifier U26, the other end of the resistor R26 is connected with a VCC power supply, the pin of the amplifier U26, the OUTPUT PUT end is connected with a motor, the other end of the amplifier U26, the pin 3610 of the amplifier U26 and the capacitor C pin 26 of the amplifier U26, the other end of the capacitor C23 is grounded.

The existing electric leakage locking device is mostly isolated from a main loop through a high-voltage reed switch relay, but the reed switch relay has poor anti-electromagnetic interference capability, and particularly in a complex electromagnetic environment in a well, the high-voltage reed switch is easy to be sucked by mistake to damage the leakage detection device. Based on this, normally closed relay KV1 is adopted in the design to secondarily isolate the leakage detection circuit, when the leakage detection is needed, relay KV2 is closed, relay KV1 is disconnected, the leakage detection circuit is put into operation, and resistor R21 plays a role in voltage division; after the leakage detection is finished, the relay is reset, if the high-voltage reed switch relay is sucked by mistake at the moment, the fleeed high voltage flows back through the resistor R21 and the relay KV1, the leakage detection circuit cannot be damaged, the resistor R24 and the resistor R26 are respectively used for setting a leakage blocking threshold value and a blocking removing threshold value, and the device can be conveniently used for leakage blocking protection of different voltage levels by adjusting the two resistors.

As shown in fig. 6, the switching value input unit includes a chip U9, the model of the chip U9 is TLP180, pin 1 of the chip U9 is connected to one end of a diode D11, one end of a capacitor C25 and one end of a resistor R41, the other end of a resistor R41 is connected to one end of a capacitor C20 and one end of a resistor R30, the other end of a resistor R30 is connected to a CON end of the leakage detection unit, the other end of the capacitor C20, the other end of the capacitor C25 and the other end of the diode D11 are grounded, pin 6 of the chip U9 is connected to one end of a resistor R32 and 12 pins of the chip U11, the other end of the resistor R32 is connected to +50V, and pin 4 of the chip U9 is grounded.

The switching value input unit plays a buffering role between the single chip microcomputer and the electric leakage detection unit, so that the single chip microcomputer can control the strong current device, and the interference caused by the strong current device can be effectively reduced.

As shown in fig. 7, the switching value output unit includes a chip U20, the model of the chip U20 is TILP127, pin 1 of the chip U20 is connected with one end of a resistor R50, the other end of the resistor R50 is connected with pin 13 of the chip U11, pin 4 of the chip U20 is connected with one end of a resistor R52, the other end of the resistor R52 is connected with one end of a resistor R53 and a base of a transistor Q1, the other end of the resistor R53 is grounded with an emitter of the transistor Q1, a collector of the transistor Q1 is connected with one end of a diode D51 and one end of a coil of a relay KV3, pin 6 of the chip U20, the other end of the diode D51 and the other end of the coil of the relay KV3 are connected with a VCC power supply, one end of a switch KV3 is connected with one end of an inductor FA and one end of a varistor R54, and the other end of the inductor FA and the other end of the varistor R54 are grounded.

When the single chip microcomputer outputs a high-level signal, the triode Q1 is conducted, the light emitting diode in the chip U20 emits light, the triode is conducted, the base electrode of the triode Q1 generates the high-level signal at the moment, the relay KV3 is electrified to generate action, the relay switch is closed, a power-on loop of a load is connected, and an I/O port controlled by the single chip microcomputer, a relay signal, a motor starting signal and the like adopt optical coupling isolation interference.

The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.