CN211790721U - Self-recovery type over-voltage and under-voltage protection circuit with leakage protection - Google Patents
Self-recovery type over-voltage and under-voltage protection circuit with leakage protection Download PDFInfo
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- CN211790721U CN211790721U CN202020695260.6U CN202020695260U CN211790721U CN 211790721 U CN211790721 U CN 211790721U CN 202020695260 U CN202020695260 U CN 202020695260U CN 211790721 U CN211790721 U CN 211790721U
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Abstract
The invention discloses a self-recovery type over-voltage and under-voltage protection circuit with leakage protection, which comprises a main line input end, a leakage signal processing part, a leakage action protection part, a periodic manual leakage test part, a mutual inductor and an over-voltage and under-voltage processing module, wherein the main line input end is connected with a main line; the current difference value of the main line input end is processed by the leakage signal processing part, and after the current difference value meets the leakage protection requirement, the leakage action protection part is controlled to carry out protection action of cutting off the power supply; the over-voltage and under-voltage processing module comprises an over-voltage and under-voltage power supply processing part, an over-voltage and under-voltage signal processing part, an analog-digital (A/D) conversion and voltage signal processing part, a relay control part and an indication part. The main circuit controls the leakage action protection part to cut off the power supply after the leakage, the over-voltage and under-voltage processing module cuts off the power supply in time when the power supply voltage is too high or too low, and the power supply is switched on again after the voltage is restored to the normal range and the time is delayed.
Description
Technical Field
The invention relates to the technical field of leakage protection, in particular to a self-recovery type over-voltage and under-voltage protection circuit with leakage protection.
Background
Leakage is an abnormal phenomenon or fault in which conductive leakage current occurs between different charged bodies of an electrical system and between a charged body and a normally uncharged exposed conductive portion due to insulation damage. As a fault, the leakage not only has great harm to the safe operation of the power system, but also has great potential harm to people and property using the power system.
In addition, various types of electric equipment have different rated voltages and allowable voltage fluctuation ranges, and the electric equipment is in an optimal state to work under the rated voltages. However, in daily life, a high voltage or a low voltage is sometimes encountered, and a voltage higher than a rated voltage is called overvoltage, and a voltage lower than the rated voltage is called undervoltage. The damage of overvoltage and undervoltage to the electric equipment is mainly reflected in that the device is damaged due to the fact that the voltage and current stress borne by the device exceeds the normal use range, and meanwhile, the electrical performance index is damaged so that the requirement cannot be met. Many electronic devices or household appliances may be burned when operating at high voltage and may have an adverse effect on their service life when operating at low voltage. The protection circuit of the prior release can not realize the protection of overvoltage and undervoltage caused by leakage of two poles, and the use occasions are limited to a great extent.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides a self-recovery type over-voltage and under-voltage protection circuit with leakage protection.
The technical scheme of the invention is as follows: the leakage current testing device comprises a main line input end, a leakage signal processing part, a leakage action protection part, a periodic manual leakage testing part, a mutual inductor and an over-voltage and under-voltage processing module, wherein the main line input end penetrates through the mutual inductor and is respectively connected with the periodic manual leakage testing part and the over-voltage and under-voltage processing module; the current difference value of the main line input end is processed by the leakage signal processing part, and after the current difference value meets the leakage protection requirement, the leakage action protection part is controlled to carry out protection action of cutting off a power supply; the overvoltage and undervoltage processing module comprises an overvoltage and undervoltage power supply processing part, an overvoltage and undervoltage signal processing part, an analog-to-digital (A/D) conversion and voltage signal processing part, a relay control part and an indication part, wherein the overvoltage and undervoltage power supply processing part is connected with a main line input end.
By adopting the technical scheme, the protective circuit has the functions of leakage protection and over-voltage and under-voltage protection, is integrated in a release product, reduces the production cost and enlarges the application range; the main circuit controls the leakage action protection part to cut off the power supply after the leakage, the over-voltage and under-voltage processing module cuts off the power supply in time when the power supply voltage is too high or too low, and the power supply is switched on again after the voltage returns to the normal range and the time delay.
Further: the electric leakage periodic manual testing part comprises a testing button switch and a resistor R1, wherein one end of the testing button switch is connected with a live wire passing through a main line input end of the mutual inductor, the other end of the testing button switch passes through the mutual inductor and is connected with a resistor R1, and the other end of the resistor R1 is connected with a zero wire passing through the main line input end of the mutual inductor. When the test button switch is pressed, one-time leakage action can be simulated, so that the product has the leakage protection function of manually checking the product.
And further: the earth leakage action protection part comprises an action coil, a diode D1, a thyristor UT, a capacitor C1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5, wherein one end of the action coil is connected to a common end of a live wire of the test button and the main line input end, the other end of the action coil is connected to an anode of the diode D1, a cathode of the diode D1 is connected to an anode of the thyristor UT, a cathode of the thyristor UT is connected to a digital ground, a control electrode of the thyristor UT is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the digital ground, one end of the resistor R2 is connected to the common end of the diode D1 and the thyristor UT, the other end of the resistor R3 is connected to the common end of the diode D1 and the thyristor UT. When the current flowing through the live wire and the zero wire is inconsistent and a current difference value is generated, the generated current difference value is processed by the leakage signal processing part to meet the leakage protection requirement, and a mechanism driving the main circuit is switched off.
Still further: the leakage signal processing part comprises a chip U1, a capacitor C2, a capacitor C3, a capacitor C4, an induction coil, a resistor R4, a diode D4, a resistor R4 and a capacitor C4, wherein the capacitors C4, the capacitor C4 and the capacitor C4 are respectively connected to eight pins, six pins and five pins of the chip U4, the capacitors are respectively connected to digital ground, three pins and four pins of the chip U4 are connected to a common end of the capacitor C4 and the digital ground, the resistors R4 and R4 are respectively connected to a common end of the capacitor C4 and the eight pins of the chip U4, a seven pin of the chip U4 is connected to the common end of the capacitor C4 and a thyristor UT, one pin and two pins of the chip U4 are connected to two ends of the capacitor C4, the common end of the capacitor D4 and the cathode of the capacitor R4 are connected to one end of the common end of the diode R4, the other end of the resistor R6 is connected with the anode of the diode D2, and the induction coil, the resistor R8 and the resistor R9 are respectively connected in parallel with the common end between the resistor R7 and the diode D2 and between the resistor R7 and the diode D2. The generated current difference is processed by an induction coil, a resistor R8, a resistor R9, a diode D2, a resistor R6, a resistor R7 and a capacitor C5, then sent to a U1 chip for processing, then processed by the cooperation of a chip U1, a capacitor C2, a capacitor C3 and a capacitor C4, judged whether the leakage protection requirement is met, and finally sent to a leakage action protection part for working whether the power is cut off
Still further: the overvoltage and undervoltage power supply processing part is connected in sequence and comprises a primary anti-surge protection unit, a resistance-capacitance voltage reduction circuit unit, a full-wave rectification unit, a secondary anti-surge protection unit and a power supply voltage stabilization processing unit, the primary anti-surge protection unit is connected with the main line input end, and the overvoltage and undervoltage signal processing part is connected to the primary anti-surge protection unit.
Still further: the two-time surge protection and resistance-capacitance voltage reduction circuit unit incoming line voltage reduction are adopted, the conversion efficiency is obviously improved, the self anti-interference performance is strong, and the voltage range is wide.
Drawings
FIG. 1 is a circuit diagram of an embodiment of the present invention;
the leakage testing device comprises a main line input end 1, a leakage signal processing part 2, a leakage action protection part 3, a leakage regular manual testing part 4, an over-voltage and under-voltage processing module 5, a mutual inductor 6, an over-voltage and under-voltage power supply processing part 51, an over-voltage and under-voltage signal processing part 52, an analog-to-digital (A/D) conversion and voltage signal processing part 53 and an indicating part 54.
Detailed Description
As shown in fig. 1, the self-recovery overvoltage and undervoltage protection circuit with leakage protection comprises a main line input end 1, a leakage signal processing part 2, a leakage action protection part 3, a leakage periodic manual test part 4, a mutual inductor 6 and an overvoltage and undervoltage processing module 5, wherein the main line input end 1 passes through the mutual inductor 6 and is respectively connected with the leakage periodic manual test part 4 and the overvoltage and undervoltage processing module 5, the leakage periodic manual test part 4 is connected with the leakage action protection part 3, and the leakage action protection part 3 is connected with the leakage signal processing part 2; the overvoltage and undervoltage processing module 5 comprises an overvoltage and undervoltage power supply processing part 51, an overvoltage and undervoltage signal processing part 52, an analog-to-digital (A/D) conversion and voltage signal processing part 53, a relay control part and an indication part 54, wherein the overvoltage and undervoltage power supply processing part 51 is connected with the main line input end 1. When the main line input end 1 leaks electricity to generate a current difference value, the leakage signal processing part 2 processes the current difference value and controls the leakage action protection part 3 to carry out protection action of cutting off the power supply after the current difference value meets the requirement of leakage protection. When the main line input end 1 has overvoltage or undervoltage, the overvoltage and undervoltage power supply processing part 51 and the overvoltage and undervoltage signal processing part 52 process the signals, and the A/D conversion and voltage signal processing part 53 analyzes the signals to control the action of the relay control part. Meanwhile, the protection circuit has the functions of leakage protection and over-voltage and under-voltage protection, is wider in protection range, protects the circuit from being damaged by impact of an over-voltage and under-voltage power supply, and is safer and more reliable in circuit protection.
The electric leakage periodic manual testing part 4 comprises a testing button switch and a resistor R1, one end of the testing button switch is connected with a live wire which penetrates through a main line input end 1 of the mutual inductor 6, the other end of the testing button switch penetrates through the mutual inductor 6 and is connected with a resistor R1, and the other end of the resistor R1 is connected with a zero wire which penetrates through a main line input end 1 of the mutual inductor 6. When the test button switch is pressed, one-time leakage action can be simulated, so that the product has the leakage protection function of manually checking the product.
The earth leakage action protection part 3 comprises an action coil, a diode D1, a thyristor UT, a capacitor C1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5, wherein one end of the action coil is connected to the common end of the test button and the live wire of the main line input end 1, the other end of the action coil is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the anode of the thyristor UT, the cathode of the thyristor UT is connected to the digital ground, the control electrode of the thyristor UT is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the digital ground, one end of the resistor R2 is connected to the common end of the diode D1 and the thyristor UT, the other end of the resistor R3 is connected to the common end of the diode D1 and the thyristor UT. The leakage signal processing part 2 comprises a chip U1, a capacitor C2, a capacitor C3, a capacitor C4, an induction coil, a resistor R4, a diode D4, a resistor R4 and a capacitor C4, wherein the capacitors C4, the capacitor C4 and the capacitor C4 are respectively connected to eight pins, six pins and five pins of the chip U4, the capacitors are respectively connected to digital ground, three pins and four pins of the chip U4 are connected to a common terminal of the capacitor C4 and the digital ground, the resistors R4 and R4 are respectively connected to a common terminal of the capacitor C4 and the eight pins of the chip U4, a seven pin of the chip U4 is connected to a common terminal of the capacitor C4 and a thyristor UT, one pin and two pins of the chip U4 are connected to two ends of the capacitor C4, a common terminal of the other end of the resistor R4 and a cathode of the capacitor D4 are connected to a common terminal of the diode R4 and a cathode of the chip 4, the other end of the resistor R6 is connected with the anode of the diode D2, and the induction coil, the resistor R8 and the resistor R9 are respectively connected in parallel with the common end between the resistor R7 and the diode D2 and between the resistor R7 and the diode D2. When the circuit at the main line input end 1 leaks electricity, currents flowing through a live line and a zero line are inconsistent, so that a current difference value is generated, the generated current difference value is processed by an induction coil, a resistor R8, a resistor R9, a diode D2, a resistor R6, a resistor R7 and a capacitor C5 and then sent to a U1 chip for processing, and then a leakage signal is processed by the cooperation of the chip U1, the capacitor C2, the capacitor C3 and the capacitor C4, when the leakage protection requirement is met, a mechanism for driving a main circuit by an action coil, a diode D1, a silicon controlled UT, a capacitor C1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5 is used for cutting off a power supply.
The overvoltage and undervoltage power supply processing part 51 comprises a primary anti-surge protection unit, a resistance-capacitance voltage reduction circuit unit, a full-wave rectification unit, a secondary anti-surge protection unit and a power supply voltage stabilization processing unit which are connected in sequence, wherein the primary anti-surge protection unit is connected with the main line input end 1, and the overvoltage and undervoltage signal processing part 52 is connected to the primary anti-surge protection unit. The primary anti-surge protection unit consists of a voltage dependent resistor RV1 and a resistor R10, and the voltage dependent resistor RV1 is connected with a live wire and a zero wire for surge protection. The resistance-capacitance voltage reduction circuit unit comprises a capacitor C6, a resistor R11 and a resistor R12 and is used for resistance-capacitance voltage reduction. The full-wave rectification unit performs full-wave rectification by a diode D3, a diode D4, a diode D5, and a diode D6. The secondary anti-surge protection unit carries out secondary anti-surge protection by a diode D7 and an electrolytic capacitor E1. The power supply voltage stabilizing processing unit consists of a diode D8, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, an electrolytic capacitor E2 and a chip U3.
The undervoltage signal processing part 52 is composed of a resistor R18, a resistor R19, a resistor R20, a diode D9, a diode D10, a resistor R21, a capacitor C7 and an electrolytic capacitor E3, wherein the resistor R18 and the resistor R19 play a role in reducing voltage of signals, the diode D9 performs half-wave rectification, the resistor R20 performs signal voltage division, and the diode D10, the resistor R21, the capacitor C7 and the electrolytic capacitor E3 perform secondary filtering and stabilization of signal voltage, so that fluctuation of the signals is reduced, and the main chip can conveniently process A/D signals.
The analog-to-digital A/D conversion and voltage signal processing part 53 comprises an analog-to-digital conversion chip U2, and the analog-to-digital conversion chip U2 performs signal analysis. The analog-digital conversion chip U2 is in a working state after stable power supply voltage exists, a power supply main signal is obtained from the A/D port to carry out signal analysis, the protector is protected when the voltage between the zero line and the live line is greater than 270VAC +/-5VAC or less than 170VAC +/-5VAC through calculation, the relay is in an attraction state, when the voltage is recovered to 240VAC +/5VAC to 190VAC +/-5VAC, the relay enters a delay state, and the relay is released to enter a normal state after the delay is finished.
The relay control part is controlled by a normally closed relay, and when the power supply voltage is out of a protection range, the relay is closed to cut off a main circuit; and when the relay is in a normal working state, the relay is released to close the main circuit, so that the effects of energy conservation and consumption reduction are achieved.
The indicating part 54 is composed of a resistor R22, a lamp LED1, a resistor R23 and a lamp LED 2. The resistor R22 and the lamp LED1 indicator lamp emit green light, and when the main circuit is electrified, the green light is on; the resistor R23 and the lamp LED2 indicate that the lamp is a red lamp, and when the main circuit voltage is out of the protection voltage, the red lamp is on.
Claims (5)
1. The utility model provides a take earth leakage protection's self-recovery formula to cross undervoltage protection circuit, includes thread input end, its characterized in that: the leakage current testing device is characterized by further comprising a leakage signal processing part, a leakage action protection part, a leakage periodic manual testing part, a mutual inductor and an over-voltage and under-voltage processing module, wherein the main line input end penetrates through the mutual inductor and is respectively connected with the leakage periodic manual testing part and the over-voltage and under-voltage processing module; the current difference value of the main line input end is processed by the leakage signal processing part, and after the current difference value meets the leakage protection requirement, the leakage action protection part is controlled to carry out protection action of cutting off a power supply; the overvoltage and undervoltage processing module comprises an overvoltage and undervoltage power supply processing part, an overvoltage and undervoltage signal processing part, an analog-to-digital (A/D) conversion and voltage signal processing part, a relay control part and an indication part, wherein the overvoltage and undervoltage power supply processing part is connected with a main line input end.
2. The self-recovery overvoltage and undervoltage protection circuit with leakage protection of claim 1, wherein: the electric leakage periodic manual testing part comprises a testing button switch and a resistor R1, one end of the testing button switch is connected with a live wire passing through a main line input end of the mutual inductor, the other end of the testing button switch passes through the mutual inductor and is connected with a resistor R1, and the other end of the resistor R1 is connected with a zero wire passing through the main line input end of the mutual inductor.
3. The self-recovery overvoltage and undervoltage protection circuit with leakage protection of claim 2, wherein: the leakage action protection part comprises an action coil, a diode D1, a thyristor UT, a capacitor C1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5, wherein one end of the action coil is connected to a common end of a live wire of the test button and the main line input end, the other end of the action coil is connected to an anode of the diode D1, a cathode of the diode D1 is connected to an anode of the thyristor UT, a cathode of the thyristor UT is connected to a digital ground, a control electrode of the thyristor UT is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the digital ground, one end of the resistor R2 is connected to the common end of the diode D1 and the thyristor, the other end of the resistor R3, one end of the resistor R4 is connected to the common end of the diode D.
4. The self-recovery overvoltage and undervoltage protection circuit with leakage protection of claim 3, wherein: the leakage signal processing part comprises a chip U1, a capacitor C2, a capacitor C3, a capacitor C4, an induction coil, a resistor R4, a diode D4, a resistor R4 and a capacitor C4, wherein the capacitor C4, the capacitor C4 and the capacitor C4 are respectively connected to eight pins, six pins and five pins of the chip U4, the capacitors of the three are all connected to a digital ground, three pins and four pins of the chip U4 are connected to a common terminal of the capacitor C4 and the digital ground, the resistor R4 and the resistor R4 are respectively connected to a common terminal of the eight pins of the capacitor C4 and the chip U4, a seven pin of the chip U4 is connected to a common terminal of the capacitor C4 and a thyristor UT, one pin and two pins of the chip U4 are connected to two ends of the capacitor C4, a common terminal of the other end of the resistor R4 and a cathode of the capacitor D4 are connected to a common terminal of the diode C4 and a cathode of the chip R4 are connected to the common terminal of the chip U4. The other end of the resistor R6 is connected with the anode of the diode D2, and the induction coil, the resistor R8 and the resistor R9 are respectively connected in parallel with the common end between the resistor R7 and the diode D2 and between the resistor R7 and the diode D2.
5. The self-recovery undervoltage protection circuit with leakage protection according to claim 1 or 4, wherein: the overvoltage and undervoltage power supply processing part is connected with the primary anti-surge protection unit, the resistance-capacitance voltage reduction circuit unit, the full-wave rectification unit, the secondary anti-surge protection unit and the power supply voltage stabilization processing unit in sequence, the primary anti-surge protection unit is connected with the main line input end, and the overvoltage and undervoltage signal processing part is connected to the primary anti-surge protection unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020695260.6U CN211790721U (en) | 2020-04-29 | 2020-04-29 | Self-recovery type over-voltage and under-voltage protection circuit with leakage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020695260.6U CN211790721U (en) | 2020-04-29 | 2020-04-29 | Self-recovery type over-voltage and under-voltage protection circuit with leakage protection |
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| Publication Number | Publication Date |
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| CN211790721U true CN211790721U (en) | 2020-10-27 |
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| CN202020695260.6U Active CN211790721U (en) | 2020-04-29 | 2020-04-29 | Self-recovery type over-voltage and under-voltage protection circuit with leakage protection |
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| CN (1) | CN211790721U (en) |
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- 2020-04-29 CN CN202020695260.6U patent/CN211790721U/en active Active
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