CN109787044B - Semi-intelligent tripolar on-off leakage protection plug - Google Patents
Semi-intelligent tripolar on-off leakage protection plug Download PDFInfo
- Publication number
- CN109787044B CN109787044B CN201910259621.4A CN201910259621A CN109787044B CN 109787044 B CN109787044 B CN 109787044B CN 201910259621 A CN201910259621 A CN 201910259621A CN 109787044 B CN109787044 B CN 109787044B
- Authority
- CN
- China
- Prior art keywords
- circuit
- electrically connected
- resistor
- voltage stabilizing
- relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention relates to a semi-intelligent tripolar on-off leakage protection plug, which comprises a direct current voltage stabilizing circuit, a relay switch circuit, a leakage protection circuit and a singlechip control circuit; the relay switch circuit comprises a relay with three groups of normally open contacts and a driving switch circuit, and the three groups of normally open contacts of the relay are respectively connected in series with a live wire L, a zero wire N and a ground wire E; the leakage protection circuit is characterized by further comprising an overvoltage protection circuit, an overtemperature protection circuit and a reset circuit, wherein the reset switch circuit resets the leakage protection circuit when power is off. The advantages are that: under the reset working condition, if the electric leakage fault occurs and meanwhile single-phase power failure occurs, if the socket with the switch is used, the live wire, the zero line and the grounded tripolar power supply can be cut off immediately, after the circuit is powered back, the original reset working condition can be automatically recovered as long as the electric leakage fault does not exist, the requirements of national standard low-voltage AC50V working can be met, the overvoltage and overtemperature protection function is also realized, the power consumption is low, the temperature rise is low, the anti-interference capability is strong, the circuit is simple, and the use is more convenient and safer.
Description
Technical Field
The invention relates to a semi-intelligent tripolar on-off leakage protection plug.
Background
The common leakage protection Plug (PRCD) is generally configured to control the on-off of the tripolar power supplies of the neutral line N, the live line L and the ground E by using a mechanical tripping device in combination with a monitoring circuit, and is a residual current action type tripping device, so that when a leakage fault occurs, if no electric shock current exists, the leakage protection will not trip and power off; therefore, once the leakage fault occurs and the single-phase power failure occurs before the power failure occurs, if the situation of using a socket with a switch and the like is adopted, the leakage protection control circuit can not trip due to the loss of working power supply, namely, the tripolar power supply can not be cut off, so that certain potential safety hazard exists; at present, once the leakage fault occurs in a reset working state and the situation that a single-phase power failure or a socket with a switch is used is encountered, the leakage protection plug of a power supply can be cut off, but the leakage protection plug cannot meet the national standard requirement of low-voltage AC50V working, and the defects of too large static power consumption, temperature rise, poor anti-interference capability, complex circuit and the like exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a safer semi-intelligent tripolar on-off leakage protection plug, which can cut off all tripolar power supplies of a live wire, a zero line and the ground when the leakage protection plug is in a reset working state, such as a leakage fault, a single-phase power failure, such as a socket with a switch, and the like, and automatically restore to the original reset working state as long as the leakage fault is not existed after the circuit is powered back, thereby not only meeting the national standard requirement of low-voltage AC50V working, but also having overvoltage and overtemperature protection functions, and having simple circuit, strong anti-interference capability and the like.
In order to achieve the purpose, the invention is realized in such a way that the plug is a semi-intelligent tripolar on-off leakage protection plug, and comprises a direct current voltage stabilizing circuit, a relay switch circuit, a leakage protection circuit and a singlechip control circuit; the input end of the direct current voltage stabilizing circuit is electrically connected with commercial alternating current, and the output end of the direct current voltage stabilizing circuit provides a working power supply for the relay switch circuit, the leakage protection circuit and the singlechip control circuit; the relay switch circuit comprises a relay with three groups of normally open contacts and a driving switch circuit, one end of the relay is electrically connected with one output end of the direct current voltage stabilizing circuit so as to obtain a direct current working power supply, the other end of the relay is electrically connected with the output end of the driving switch circuit, the three groups of normally open contacts of the relay are respectively connected on a fire wire L, a zero wire N and a ground wire E in series, and the input end of the driving switch circuit is electrically connected with the first output end of the singlechip control circuit; the output end of the leakage protection circuit is electrically connected with the first input end of the singlechip control circuit; the over-temperature protection circuit is characterized by further comprising an over-voltage protection circuit, an over-temperature protection circuit and a reset circuit; the input end of the overvoltage protection circuit is electrically connected with the rectification output end of the direct-current voltage stabilizing circuit, and the output end of the overvoltage protection circuit is electrically connected with the second input end of the singlechip control circuit; one end of the overtemperature protection circuit is electrically connected with the zero line N, and the other end of the overtemperature protection circuit is electrically connected with a third input end of the singlechip control circuit; the input end of the reset circuit is electrically connected with the output end of the driving switch circuit, the output end of the reset circuit is electrically connected with the power circuit end of the leakage protection circuit, and the reset circuit resets the leakage protection circuit when power is off.
In the technical scheme, the reset circuit comprises a second switching triode, a seventh resistor, an eighth resistor and a fourth capacitor; one end of the eighth resistor is connected in parallel with the fourth capacitor and then is respectively and electrically connected with the base electrode of the second switching triode and one end of the seventh resistor, the other end of the seventh resistor is grounded, the other end of the seventh resistor is electrically connected with the output end of the driving switching circuit, the emitter electrode of the second switching triode is grounded, and the collector electrode of the second switching triode is electrically connected with the power circuit end of the leakage protection circuit.
In the technical scheme, the singlechip control circuit comprises a singlechip and a reset switch; the model of the single-chip microcomputer is XJLB8002, 8 pins are provided, the 1 pin of the single-chip microcomputer is connected with a zero line N, the 2 pin of the single-chip microcomputer is a first output end, the 3 pin of the single-chip microcomputer is a first input end, the 6 pin of the single-chip microcomputer is a second input end, the 5 pin of the single-chip microcomputer is a third input end, the 8 pin of the single-chip microcomputer is electrically connected with the positive electrode output end of the direct current voltage stabilizing circuit, one end of the reset switch is electrically connected with the 4 pin of the single-chip microcomputer, and the other end of the reset switch is grounded; the LED driving circuit also comprises a work indicating circuit, wherein the work indicating circuit comprises a fourth resistor and an LED, one end of the fourth resistor is electrically connected with the 7 pin of the singlechip after being connected in series with the LED, and the other end of the fourth resistor is electrically connected with one output end of the DC voltage stabilizing circuit.
In the technical scheme, the direct current voltage stabilizing circuit comprises a rectifier diode, a first three-terminal voltage stabilizing block, a second three-terminal voltage stabilizing block, first to third electrolytic capacitors, a third capacitor and a sixth resistor; the anode of the rectifying diode is electrically connected with the live wire L, the cathode of the rectifying diode is electrically connected with the positive end of the first electrolytic capacitor, the input end of the first three-end voltage stabilizing block and the input end of the overvoltage protection circuit respectively, the cathode of the rectifying diode is the rectifying output end of the direct-current voltage stabilizing circuit, the output end of the first three-end voltage stabilizing block is electrically connected with the positive end of the third electrolytic capacitor, one end of the sixth resistor, the input end of the second three-end voltage stabilizing block and one end of the relay respectively, the first three-end voltage stabilizing block provides working voltage for the relay, and the other end of the sixth resistor provides direct-current working power supply for the leakage protection circuit; the negative end of the first electrolytic capacitor, the negative end of the third electrolytic capacitor and the grounding end of the first three-end voltage stabilizing block are all electrically connected with the zero line N, and the output end of the second three-end voltage stabilizing block is respectively electrically connected with the 8 pin of the singlechip, the anode of the light-emitting diode, one end of the third capacitor and the positive end of the second electrolytic capacitor, and the other end of the third capacitor, the negative end of the second electrolytic capacitor and the grounding end of the second three-end voltage stabilizing block are all grounded.
In the technical scheme, the overvoltage protection circuit comprises a first resistor, a second resistor, a first capacitor and a voltage stabilizing diode; one end of the first resistor is electrically connected with the rectification output end of the direct current voltage stabilizing circuit, the other end of the first resistor is electrically connected with one end of the first capacitor and the cathode of the voltage stabilizing diode respectively, the other end of the first capacitor is electrically connected with the zero line N, the anode of the voltage stabilizing diode is electrically connected with one end of the second resistor and the 6 pin of the singlechip respectively, and the other end of the second resistor is grounded.
In the technical scheme, the over-temperature protection circuit comprises a second capacitor, a third resistor and a negative temperature coefficient thermistor; one end of the second capacitor, the third resistor and the negative temperature coefficient thermistor are connected in parallel and then are electrically connected with the zero line N, and the other end of the second capacitor, the third resistor and the negative temperature coefficient thermistor are electrically connected with a 5 pin of the singlechip.
In the technical scheme, the high-voltage relay further comprises a second diode, wherein two ends of the second diode are connected in parallel with two ends of the relay, and a cathode of the second diode is electrically connected with an output end of the first three-terminal voltage stabilizing block; the driving switch circuit comprises a first switch triode and a fifth resistor, wherein the base electrode of the first switch triode is electrically connected with the 2 pin of the singlechip through the fifth resistor, the collector electrode of the first switch triode is electrically connected with the other end of the relay, the collector electrode of the first switch triode is also electrically connected with the second switch triode through the seventh resistor, and the emitter electrode of the first switch triode is grounded.
Compared with the prior art, the invention has the advantages that: under the reset working condition, if the electric leakage fault occurs and meanwhile single-phase power failure occurs, if the socket with the switch is used, the live wire, the zero line and the grounded tripolar power supply can be cut off immediately, after the circuit is powered back, the original reset working condition can be automatically recovered as long as the electric leakage fault does not exist, the requirements of national standard low-voltage AC50V working can be met, the overvoltage and overtemperature protection function is also realized, the power consumption is low, the temperature rise is low, the anti-interference capability is strong, the circuit is simple, and the use is more convenient and safer.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Description of the embodiments
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
In the description of the present invention, the terms "first" through "tenth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the plug is a semi-intelligent tripolar on-off leakage protection plug, and comprises a direct current voltage stabilizing circuit 1, a relay switch circuit 2, a leakage protection circuit 3, an overvoltage protection circuit 4, an overtemperature protection circuit 5, a work indication circuit 6, a singlechip control circuit 7 and a reset circuit 8; the input end of the direct current voltage stabilizing circuit 1 is electrically connected with commercial alternating current, and the output end of the direct current voltage stabilizing circuit 1 provides a working power supply for a relay switch circuit 2, a leakage protection circuit 3, an overvoltage protection circuit 4, an overtemperature protection circuit 5, a working indication circuit 6, a singlechip control circuit 7 and a reset circuit 8; the relay switch circuit 2 comprises a relay JK with three groups of normally open contacts and a driving switch circuit, one end of the relay JK is electrically connected with one output end of the direct current voltage stabilizing circuit 1 so as to acquire a direct current working power supply, the other end of the relay JK is electrically connected with the output end of the driving switch circuit, the three groups of normally open contacts of the relay JK are respectively connected on a live wire L, a zero wire N and a ground wire E in series, and the input end of the driving switch circuit is electrically connected with the first output end of the singlechip control circuit 7; the output end of the leakage protection circuit 3 is electrically connected with the first input end of the singlechip control circuit 7; the input end of the overvoltage protection circuit 4 is electrically connected with the rectification output end of the direct current voltage stabilizing circuit 1, and the output end of the overvoltage protection circuit 4 is electrically connected with the second input end of the singlechip control circuit 7; one end of the overtemperature protection circuit 5 is electrically connected with the zero line N, and the other end of the overtemperature protection circuit 5 is electrically connected with a third input end of the singlechip control circuit 7; the input end of the work indicating circuit 6 is electrically connected with the second output end of the singlechip control circuit 7; the input end of the reset circuit 8 is electrically connected with the output end of the driving switch circuit, the output end of the reset circuit 8 is electrically connected with the power circuit end of the leakage protection circuit 3, when the power is off, the output end of the driving switch circuit is at a high level, the reset circuit 8 resets the leakage protection circuit 3, when the power is restored to be normal, the output end of the driving switch circuit is at a low level, the reset circuit 8 is disconnected, and the leakage protection circuit 3 is not acted.
In operation, when the leakage protection circuit 3 has I Δn When the leakage fault signal is output, the first input end of the singlechip control circuit 7 receives I output by the singlechip control circuit 7 Δn The fault signal is processed, the first output end of the singlechip control circuit 7 outputs low level to the driving switch circuit, the driving switch circuit is disconnected, the second output end of the singlechip control circuit 7 outputs high level to the work indication circuit 6, the LED indication lamp sends out a flicker alarm signal, the relay JK is powered off, and the three groups of normally open contacts are disconnected, so that the power supply of N zero, L fire and PE grounding tripolar is cut off until the electric leakage fault is completely eliminated, the reset key is pressed again, the switching-on power supply can be restored, and the personal safety is effectively protected; after tripping and power-off, the input end of the reset circuit 8 is at a high level, and the output end of the reset circuit 8 is at a low level, namely, the power supply of the leakage protection circuit is cut off (short-circuited); after the leakage fault is removed, a RESET switch key is pressed down, the first output end and the second output end of the singlechip control circuit 7 output high level, the drive switch circuit is conducted, the relay JK is powered on, three groups of normally open contacts are closed and conducted to restore a power supply state, the work indicating circuit 6 restores a normally-on state, the input end of the RESET circuit 8 is converted to low level, and the RESET circuit is RESETThe output end of the bit circuit 8 is converted to a high level, namely, the power supply is recovered to the leakage protection circuit; because the working power supplies of the relay JK, the leakage protection circuit 3 and the singlechip control circuit 7 are all provided by the direct-current stabilized power supply 1, the direct-current stabilized power supply 1 can still provide working voltage under the low-voltage AC50V state, and the singlechip control circuit 5, the relay switch circuit 2 and the leakage protection circuit 3 work normally, the technical scheme completely meets the national standard requirement of AC50V low-voltage work.
In this embodiment, the single-chip microcomputer control circuit 7 includes a single-chip microcomputer U3 and a RESET switch RESET; the model of the single-chip microcomputer U3 is XJLB8002, 8 pins are provided, the 1 pin of the single-chip microcomputer U3 is connected with a zero line N, the 2 pin of the single-chip microcomputer U3 is a first output end, the 3 pin of the single-chip microcomputer U3 is a first input end, the 6 pin of the single-chip microcomputer U3 is a second input end, the 5 pin of the single-chip microcomputer U3 is a third input end, the 8 pin of the single-chip microcomputer U3 is electrically connected with one output end of the direct current voltage stabilizing circuit 1, one end of the RESET switch RESET is electrically connected with the 4 pin of the single-chip microcomputer U3, and the other end of the RESET switch RESET is grounded; the LED driving circuit further comprises a work indicating circuit 6, wherein the work indicating circuit 6 comprises a fourth resistor R4 and a light emitting diode LED, one end of the fourth resistor R4 connected with the light emitting diode LED in series is electrically connected with the 7 pin of the singlechip U3, and the other end of the fourth resistor R4 is electrically connected with an output end of the direct current voltage stabilizing circuit 1.
In the resetting working state, if the power failure phenomenon occurs, the direct current voltage stabilizing circuit 1 is powered off, the singlechip U3 and the relay JK are powered off, and the three groups of normally open contacts are immediately disconnected; when the power supply is restored, as long as no leakage fault exists, the 2 pins of the single chip microcomputer U3 output high level, the driving switch circuit is conducted, the three groups of normally open contacts are automatically attracted and conducted to restore to the power supply working state, the 7 pins of the single chip microcomputer U3 output low level, and the light emitting diode LED is kept in a normally-on state. When I occurs Δn In case of leakage failure, the output end of the leakage protection circuit 3 will be I Δn The leakage fault signal is input to the 3 pins of the single-chip microcomputer U3, the 2 pins of the single-chip microcomputer U3 are reversed from high potential to low potential, the driving switch circuit is disconnected, the relay JK is powered off, the three groups of normally open contacts are immediately disconnected to stop supplying power to the electric appliance load, the 7 pins of the single-chip microcomputer U3 intermittently output high level, and the LED flashes to alarm; if go outNow I Δn The leakage fault is subjected to the condition that the power is cut off and then the power supply is restored, so that the single chip microcomputer U3 cannot output a reversing signal to the driving switch circuit as long as the leakage fault is not removed, the relay JK is always powered off, and the three groups of normally open contacts are always in an open state and cannot be automatically closed; when the power supply is recovered, the leakage fault is eliminated, the 2 pins of the singlechip U3 can automatically output high potential, the driving switch circuit is conducted, the relay JK is electrified, and the three groups of normally open contacts are closed to recover the power supply state, so that the power supply is very safe and reliable.
In this embodiment, the dc voltage stabilizing circuit 1 includes a rectifying diode D1, a first three-terminal voltage stabilizing block U1, a second three-terminal voltage stabilizing block U2, first to third electrolytic capacitors E1 to E3, a third capacitor C3, and a sixth resistor R6; the anode of the rectifying diode D1 is electrically connected with the live wire L, the cathode of the rectifying diode D1 is electrically connected with the positive end of the first electrolytic capacitor E1, the input end of the first three-end voltage stabilizing block U1 and the input end of the overvoltage protection circuit 4 respectively, the cathode of the rectifying diode D1 is the rectifying output end of the direct-current voltage stabilizing circuit 1, the output end of the first three-end voltage stabilizing block U1 is electrically connected with the positive end of the third electrolytic capacitor E3, one end of the sixth resistor R6, the input end of the second three-end voltage stabilizing block U2 and one end of the relay JK respectively, the output end of the first three-end voltage stabilizing block U1 provides working voltage for the relay JK, and the other end of the sixth resistor R6 provides direct-current working power supply for the leakage protection circuit 3; the negative end of the first electrolytic capacitor E1, the negative end of the third electrolytic capacitor E3 and the grounding end of the first three-end voltage stabilizing block U1 are electrically connected with a zero line N, the output end of the second three-end voltage stabilizing block U2 is respectively and electrically connected with the 8 pins of the single chip microcomputer U3, the anode of the light emitting diode LED, one end of the third capacitor C3 and the positive end of the second electrolytic capacitor E2, the output end of the second three-end voltage stabilizing block U2 provides a direct current working power supply for the single chip microcomputer U3, and the other end of the third capacitor C3, the negative end of the second electrolytic capacitor E2 and the grounding end of the second three-end voltage stabilizing block U2 are all grounded.
In this embodiment, the overvoltage protection circuit 4 includes a first resistor R1, a second resistor R2, a first capacitor C1, and a zener diode DW; one end of the first resistor R1 is electrically connected with the anode of the rectifier diode D1, the end of the first resistor R1 is an input end of the overvoltage protection circuit 4, the other end of the first resistor R1 is electrically connected with one end of the first capacitor C1 and the cathode of the voltage stabilizing diode DW respectively, the other end of the first capacitor C1 is electrically connected with the zero line N, the anode of the voltage stabilizing diode DW is electrically connected with one end of the second resistor R2 and the 6 pin of the singlechip U3 respectively, and the other end of the second resistor R2 is grounded.
When the direct current voltage stabilizing circuit 1 works, when the voltage at the rectifying output end of the direct current voltage stabilizing circuit is too high, namely the commercial alternating current exceeds 295V, the voltage stabilizing diode DW immediately performs avalanche short circuit, the 6 pin of the single chip microcomputer U3 immediately changes from low potential to high potential, the 2 pin of the single chip microcomputer U3 immediately reverses from high potential to low potential, the driving switch circuit is disconnected, the relay JK is powered off to disconnect three groups of normally open contacts, and the overvoltage protection function is achieved; when the alternating current in the market is lower than 250V, the voltage stabilizing diode DW is in a normal state, the 6 pin of the singlechip U3 returns to a low potential, the 2 pin of the singlechip U3 outputs a high level, the driving switch circuit is conducted, the relay JK is powered on to work, and the three groups of normally open contacts are closed to restore normal power supply.
In this embodiment, the overtemperature protection circuit 6 includes a third resistor R3, a second capacitor C2, and a negative temperature coefficient thermistor Rt; and one end of the second capacitor C2 is electrically connected with the zero line N after being connected in parallel with the negative temperature coefficient thermistor Rt, the other end of the second capacitor C2 is electrically connected with the 5 pin of the singlechip U3 and one end of the third resistor R3 respectively, and the other end of the third resistor R3 is electrically connected with the output end of the end voltage stabilizing block U1.
When the temperature sensed by the negative temperature coefficient thermistor Rt is higher than 120 ℃, namely the resistance value of the thermistor Rt is reduced to a certain value, and the 5 feet of the singlechip U3 are reduced to a set value from high potential, the 2 feet of the singlechip U3 are immediately reversely turned to low potential from high potential, a driving switch circuit is disconnected, a relay JK is powered off to disconnect three groups of normally open contacts, the overvoltage protection effect is achieved, when the temperature is reduced to below 50 ℃, the negative temperature coefficient thermistor Rt is returned to a certain value, the 2 feet of the singlechip U3 output high level, the driving switch circuit is turned on, the relay JK is powered on, and the three groups of normally open contacts are closed to restore normal power supply.
In this embodiment, the circuit further includes a second diode D2, two ends of the second diode D2 are connected in parallel to two ends of the relay JK, and a cathode of the second diode D2 is electrically connected to an output end of the first three-terminal voltage stabilizing block U1; the driving switch circuit comprises a first switch triode Q1 and a fifth resistor R5, wherein the base electrode of the first switch triode Q1 is electrically connected with the 2 pin of the singlechip U3 through the fifth resistor R5, the collector electrode of the first switch triode Q1 is electrically connected with the other end of the relay JK, and the emitter electrode of the first switch triode Q1 is grounded.
In this embodiment, the reset circuit 8 includes a second switching transistor Q2, a seventh resistor R7, an eighth resistor R8, and a fourth capacitor C4; one end of the eighth resistor R8 is connected with the base electrode of the second switching triode Q2 and one end of the seventh resistor R7 in parallel after the fourth capacitor C4 is connected with the base electrode of the second switching triode Q2 in parallel, the other end of the seventh resistor R7 is grounded, the other end of the seventh resistor R7 is electrically connected with the collector electrode of the first switching triode Q1, the emitter electrode of the second switching triode Q2 is grounded, and the collector electrode of the second switching triode Q2 is electrically connected with the power circuit end of the leakage protection circuit 3.
When in operation, the 3 pin of the singlechip U3 receives I Δn When in leakage signal, the pin 2 of the singlechip U3 immediately outputs a low-level signal to the base electrode of the first switching triode Q1, the first switching triode Q1 is disconnected, the relay JK is powered off, three groups of normally open contacts are disconnected so as to cut off the power supply and not automatically restore the power supply, meanwhile, the base electrode of the second switching triode Q2 becomes high level, and the second switching triode Q2 is conducted so as to short-circuit and power-off the power supply circuit end of the leakage protection circuit 3; the forced leakage protection latch circuit is turned over and RESET, when the leakage fault is removed, a RESET switch RESET is pressed, a high-level signal is output to the base electrode of a first switching triode Q1 by a pin 2 of a singlechip U3, the first switching triode Q1 is conducted, a relay JK is electrified, three groups of normally open contacts of the relay JK are conducted to continuously supply power to a load, meanwhile, the base electrode of a second switching triode Q2 is changed into a low level, the second switching triode Q2 is disconnected, and the leakage protection circuit is electrified to be started to be in a standby monitoring state.
In this embodiment, the leakage protection circuit 3 includes a first induction coil ZCT1, a second induction coil ZCT2, a TEST switch TEST, fifth to tenth capacitors C5 to C10, ninth to twelfth resistors R9 to R12, and a leakage fault monitoring chip U3; the model of the leakage fault monitoring chip U3 is RT54123B, the leakage fault monitoring chip U3 is provided with 8 pins, pins 1 and 2 of the leakage fault monitoring chip U3 are first input ends of the leakage protection circuit 3, pins 2 and 3 of the leakage fault monitoring chip U3 are second input ends of the leakage protection circuit 3, pin 7 of the leakage fault monitoring chip U3 is output ends of the leakage protection circuit 3, and pin 4 of the leakage fault monitoring chip U3 is connected with a zero line N; two ends of a fifth capacitor C5 are respectively and electrically connected with a pin 4 and a pin 5 of the leakage fault monitoring chip U3, two ends of a sixth capacitor C6 are respectively and electrically connected with a pin 6 and a pin 7 of the leakage fault monitoring chip U4, and two ends of a seventh capacitor C7 are respectively and electrically connected with a pin 7 and a pin 4 of the leakage fault monitoring chip U3; the 8 pin of the leakage fault monitoring chip U3 is respectively and electrically connected with the other end of the sixth resistor R6 and the collector electrode of the second switching triode Q2, and the sixth resistor R6 provides direct-current working voltage for the leakage fault monitoring chip U3; when the power is off, the base electrode of the second switching triode Q2 obtains high level, and the second switching triode Q2 is conducted to reset the leakage fault monitoring chip U3; when the leakage problem is solved and normal power supply is restored, as the first switching triode Q1 is conducted, the base electrode of the second switching triode Q2 is low level, the second switching triode Q2 is disconnected, and the second switching triode Q2 does not act on the leakage fault monitoring chip U3; two ends of the eighth capacitor C8 and the eleventh resistor R11 are respectively and electrically connected with the 2 pin and the 3 pin of the leakage fault monitoring chip U34, and two ends of the tenth capacitor C10 and the twelfth resistor R12 are respectively and electrically connected with the 1 pin and the 2 pin of the leakage fault monitoring chip U3; one end of the ninth capacitor C9 is electrically connected with the 2 pin of the leakage fault monitoring chip U3, and the other end of the ninth capacitor C9 is grounded; the first induction coil ZCT1 is sleeved on the live wire L and the zero line N, two ends of a first group of coils of the first induction coil ZCT1 are respectively and electrically connected with a pin 2 and a pin 3 of the electric leakage fault monitoring chip U3, one end of a second group of coils of the first induction coil ZCT1 is electrically connected with the live wire L through a tenth resistor R10 and a TEST switch TEST, and the other end of the second group of coils of the first induction coil ZCT1 is grounded; the second induction coil ZCT2 is sleeved on the ground wire E, and two ends of the second induction coil ZCT2 are electrically connected with the 1 pin and the 2 pin of the leakage fault monitoring chip U3.
In operation, when the first induction coil ZCT1 or the second induction coil ZCTTwo induction coils ZCT2 sense I Δn When the leakage fault signal is generated, the leakage fault monitoring chip U3 immediately senses I of the first induction coil ZCT1 or the second induction coil ZCT2 Δn After the electric leakage fault signal is amplified, the electric leakage fault signal is input to the input end 3 pin of the single chip microcomputer U3 through a ninth resistor R9, the 2 pin of the single chip microcomputer U3 immediately outputs a low level, the first switching triode Q1 is controlled to be opened through a fifth resistor R5, the relay JK is powered off, three groups of normally open contacts of the relay JK are immediately disconnected to cut off a tripolar power supply, the purpose of protecting personal safety is achieved, at the moment, the 7 pin of the single chip microcomputer U3 intermittently outputs a high level, and the light emitting diode LED flashes to give an alarm; when the leakage fault is eliminated, the RESET switch key is required to be pressed again, the 2 pin of the singlechip U3 can be turned from low potential to high potential, the relay JK is powered on, the first switching triode Q1 is conducted, and the three groups of normally open contacts are closed to restore to supply power to the load electric appliance.
Detecting the leakage protection function: when the TEST switch is pressed, the second set of coils of the first induction coil ZCT1 sense the simulation I Δn Leakage fault signal, which is input to the leakage fault monitoring chip U3 by the first group of coils of the first induction coil ZCT1, I to be sensed by the leakage fault monitoring chip U3 Δn The leakage fault signal is amplified and input to the 3 feet of the input end of the single chip microcomputer U3, the 2 feet of the single chip microcomputer U3 immediately output low level and input to the base electrode of the first switching triode Q1 through the fifth resistor R5, the first switching triode Q1 is opened, the relay JK is powered off, three groups of normally open contacts of the relay JK are restored to be immediately disconnected, and the purpose of detecting the working condition of the leakage protection plug is achieved.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made hereto without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A semi-intelligent tripolar on-off leakage protection plug comprises a direct current voltage stabilizing circuit (1), a relay switch circuit (2), a leakage protection circuit (3) and a singlechip control circuit (7); the input end of the direct current voltage stabilizing circuit (1) is electrically connected with commercial alternating current, and the output end of the direct current voltage stabilizing circuit (1) provides working power for the relay switch circuit (2), the leakage protection circuit (3) and the singlechip control circuit (7); the relay switch circuit (2) comprises a relay (JK) with three groups of normally open contacts and a driving switch circuit, one end of the relay (JK) is electrically connected with one output end of the direct current voltage stabilizing circuit (1) so as to acquire a direct current working power supply, the other end of the relay (JK) is electrically connected with the output end of the driving switch circuit, the three groups of normally open contacts of the relay (JK) are respectively connected on a live wire L, a zero wire N and a ground wire E in series, and the input end of the driving switch circuit is electrically connected with the first output end of the single chip microcomputer control circuit (7); the output end of the leakage protection circuit (3) is electrically connected with the first input end of the singlechip control circuit (7); the device is characterized by further comprising an overvoltage protection circuit (4), an overtemperature protection circuit (5) and a reset circuit (8); the input end of the overvoltage protection circuit (4) is electrically connected with the rectification output end of the direct current voltage stabilizing circuit (1), and the output end of the overvoltage protection circuit (4) is electrically connected with the second input end of the singlechip control circuit (7); one end of the overtemperature protection circuit (5) is electrically connected with the zero line N, and the other end of the overtemperature protection circuit (5) is electrically connected with a third input end of the singlechip control circuit (7); the input end of the reset circuit (8) is electrically connected with the output end of the driving switch circuit, the output end of the reset circuit (8) is electrically connected with the power circuit end of the leakage protection circuit (3), and the reset circuit (8) resets the leakage protection circuit (3) when power is off;
the reset circuit (8) comprises a second switching triode (Q2), a seventh resistor (R7), an eighth resistor (R8) and a fourth capacitor (C4); one end of the eighth resistor (R8) is connected with the base electrode of the second switching triode (Q2) and one end of the seventh resistor (R7) in parallel after being connected with the fourth capacitor (C4) respectively, the other end of the eighth resistor (R7) is grounded, the other end of the seventh resistor (R7) is electrically connected with the output end of the driving switching circuit, the emitter electrode of the second switching triode (Q2) is grounded, and the collector electrode of the second switching triode (Q2) is electrically connected with the power circuit end of the leakage protection circuit (3);
the singlechip control circuit (7) comprises a singlechip (U3) and a RESET switch (RESET); the model of the single chip microcomputer (U3) is XJLB8002, 8 pins are provided, the 1 pin of the single chip microcomputer (U3) is connected with a zero line N, the 2 pin of the single chip microcomputer (U3) is a first output end, the 3 pin of the single chip microcomputer (U3) is a first input end, the 6 pin of the single chip microcomputer (U3) is a second input end, the 5 pin of the single chip microcomputer (U3) is a third input end, the 8 pin of the single chip microcomputer (U3) is electrically connected with one output end of the direct current voltage stabilizing circuit (1), one end of the RESET switch (RESET) is electrically connected with the 4 pin of the single chip microcomputer (U3), and the other end of the RESET switch (RESET) is grounded; the LED driving circuit also comprises a work indicating circuit (6), wherein the work indicating circuit (6) comprises a fourth resistor (R4) and a Light Emitting Diode (LED), one end of the fourth resistor (R4) is electrically connected with the 7 pin of the singlechip (U3) after being connected with the Light Emitting Diode (LED) in series, and the other end of the fourth resistor is electrically connected with one output end of the direct current voltage stabilizing circuit (1);
the direct current voltage stabilizing circuit (1) comprises a rectifying diode (D1), a first three-terminal voltage stabilizing block (U1), a second three-terminal voltage stabilizing block (U2), first to third electrolytic capacitors (E1-E3), a third capacitor (C3) and a sixth resistor (R6); the anode of the rectifying diode (D1) is electrically connected with the live wire L, the cathode of the rectifying diode (D1) is electrically connected with the positive electrode end of the first electrolytic capacitor (E1) and the input end of the first three-terminal voltage stabilizing block (U1) and the input end of the overvoltage protection circuit (4), the cathode of the rectifying diode (D1) is the rectifying output end of the direct-current voltage stabilizing circuit (1), the output end of the first three-terminal voltage stabilizing block (U1) is electrically connected with the positive electrode end of the third electrolytic capacitor (E3), one end of the sixth resistor (R6), the input end of the second three-terminal voltage stabilizing block (U2) and one end of the relay (JK) respectively, the first three-terminal voltage stabilizing block (U1) provides working voltage for the relay (JK), and the other end of the sixth resistor (R6) provides direct-current working power supply for the leakage protection circuit (3); the negative electrode end of the first electrolytic capacitor (E1), the negative electrode end of the third electrolytic capacitor (E3) and the grounding end of the first three-end voltage stabilizing block (U1) are electrically connected with a zero line N, the output end of the second three-end voltage stabilizing block (U2) is respectively electrically connected with the 8 pin of the singlechip (U3), the anode of the light-emitting diode (LED), one end of the third capacitor (C3) and the positive electrode end of the second electrolytic capacitor (E2), and the other end of the third capacitor (C3), the negative electrode end of the second electrolytic capacitor (E2) and the grounding end of the second three-end voltage stabilizing block (U2) are grounded;
the overvoltage protection circuit (4) comprises a first resistor (R1), a second resistor (R2), a first capacitor (C1) and a voltage stabilizing Diode (DW); one end of a first resistor (R1) is electrically connected with a rectification output end of a direct current voltage stabilizing circuit (1), the other end of the first resistor (R1) is electrically connected with one end of a first capacitor (C1) and a cathode of a voltage stabilizing Diode (DW), the other end of the first capacitor (C1) is electrically connected with a zero line N, an anode of the voltage stabilizing Diode (DW) is electrically connected with one end of a second resistor (R2) and a 6 pin of a single chip microcomputer (U3) respectively, and the other end of the second resistor (R2) is grounded;
the over-temperature protection circuit (5) comprises a second capacitor (C2), a third resistor (R3) and a negative temperature coefficient thermistor (Rt); one end of the second capacitor (C2), the third resistor (R3) and the negative temperature coefficient thermistor (Rt) are connected in parallel and then are electrically connected with the zero line N, and the other end of the second capacitor is electrically connected with the 5 pin of the singlechip (U3).
2. The semi-intelligent tripolar on-off leakage protection plug according to claim 1, further comprising a second diode (D2), wherein two ends of the second diode (D2) are connected in parallel to two ends of the relay (JK), and a cathode of the second diode (D2) is electrically connected with an output end of the first three-terminal voltage stabilizing block (U1); the driving switch circuit comprises a first switch triode (Q1) and a fifth resistor (R5), wherein the base electrode of the first switch triode (Q1) is electrically connected with the 2 pin of the single chip microcomputer (U3) through the fifth resistor (R5), the collector electrode of the first switch triode (Q1) is electrically connected with the other end of the relay (JK), the collector electrode of the first switch triode (Q1) is electrically connected with the second switch triode (Q2) through a seventh resistor (R7), and the emitter electrode of the first switch triode (Q1) is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910259621.4A CN109787044B (en) | 2019-04-02 | 2019-04-02 | Semi-intelligent tripolar on-off leakage protection plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910259621.4A CN109787044B (en) | 2019-04-02 | 2019-04-02 | Semi-intelligent tripolar on-off leakage protection plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109787044A CN109787044A (en) | 2019-05-21 |
| CN109787044B true CN109787044B (en) | 2023-09-22 |
Family
ID=66491514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910259621.4A Active CN109787044B (en) | 2019-04-02 | 2019-04-02 | Semi-intelligent tripolar on-off leakage protection plug |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109787044B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2325908Y (en) * | 1997-12-05 | 1999-06-23 | 郭朝凤 | Multi-function automatic protector for protecting electric appliance from being fired |
| CN2859687Y (en) * | 2005-11-29 | 2007-01-17 | 黑龙江省通信传输局 | Minute power consumption wireless remote control time switch |
| CN201479426U (en) * | 2009-09-10 | 2010-05-19 | 浙江福光灯具科技有限公司 | Electricity-saving appliance |
| CN201726102U (en) * | 2010-06-12 | 2011-01-26 | 深圳龙多电子科技有限公司 | Intelligent current leakage protection circuit |
| CN102340246A (en) * | 2011-08-18 | 2012-02-01 | 南京航空航天大学 | Thick-film magnetic isolation direct current solid-state power controller |
| CN102377157A (en) * | 2011-11-25 | 2012-03-14 | 湖南新航程智能测控技术有限公司 | Intelligent fire fighting electrical control device |
| CN202917945U (en) * | 2012-11-06 | 2013-05-01 | 杭州凯特电器有限公司 | Power strip with undervoltage, overvoltage, overcurrent protection function |
| CN105048421A (en) * | 2015-09-01 | 2015-11-11 | 江门市甜的电器有限公司 | Switch contact adhesion fault protection circuit |
| CN106374423A (en) * | 2016-11-02 | 2017-02-01 | 成都俊巡科技有限公司 | Energy-saving efficient circuit structure |
| CN209526293U (en) * | 2019-04-02 | 2019-10-22 | 佛山市顺德区信辉达电子有限公司 | Three pole on-off leakage protecting plug of semi-intelligent |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023369B (en) * | 2011-09-27 | 2015-04-01 | 台达电子企业管理（上海）有限公司 | Capacitance discharge circuit and power converter |
-
2019
- 2019-04-02 CN CN201910259621.4A patent/CN109787044B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2325908Y (en) * | 1997-12-05 | 1999-06-23 | 郭朝凤 | Multi-function automatic protector for protecting electric appliance from being fired |
| CN2859687Y (en) * | 2005-11-29 | 2007-01-17 | 黑龙江省通信传输局 | Minute power consumption wireless remote control time switch |
| CN201479426U (en) * | 2009-09-10 | 2010-05-19 | 浙江福光灯具科技有限公司 | Electricity-saving appliance |
| CN201726102U (en) * | 2010-06-12 | 2011-01-26 | 深圳龙多电子科技有限公司 | Intelligent current leakage protection circuit |
| CN102340246A (en) * | 2011-08-18 | 2012-02-01 | 南京航空航天大学 | Thick-film magnetic isolation direct current solid-state power controller |
| CN102377157A (en) * | 2011-11-25 | 2012-03-14 | 湖南新航程智能测控技术有限公司 | Intelligent fire fighting electrical control device |
| CN202917945U (en) * | 2012-11-06 | 2013-05-01 | 杭州凯特电器有限公司 | Power strip with undervoltage, overvoltage, overcurrent protection function |
| CN105048421A (en) * | 2015-09-01 | 2015-11-11 | 江门市甜的电器有限公司 | Switch contact adhesion fault protection circuit |
| CN106374423A (en) * | 2016-11-02 | 2017-02-01 | 成都俊巡科技有限公司 | Energy-saving efficient circuit structure |
| CN209526293U (en) * | 2019-04-02 | 2019-10-22 | 佛山市顺德区信辉达电子有限公司 | Three pole on-off leakage protecting plug of semi-intelligent |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109787044A (en) | 2019-05-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209748270U (en) | Intelligent safety power supply device | |
| CN203491680U (en) | Automatic reset electric leakage overvoltage/undervoltage protection circuit | |
| CN109787044B (en) | Semi-intelligent tripolar on-off leakage protection plug | |
| CN205583646U (en) | Earth leakage protection wall switch | |
| CN112865015A (en) | Sensor with high-voltage zero-sequence protection and measurement functions | |
| CN209881386U (en) | Protection circuit for electrification of shell | |
| CN209526293U (en) | Three pole on-off leakage protecting plug of semi-intelligent | |
| CN214754507U (en) | Circuit with timing function and leakage protection plug | |
| CN108306257A (en) | Three pole break-make leakage protecting plug of intelligent control type | |
| CN212183104U (en) | Power supply electroless trip switch | |
| CN204206137U (en) | A kind of protective circuit of refrigeration plant | |
| CN210224935U (en) | Leakage protection circuit with grounding and surge protection functions | |
| CN208820453U (en) | A kind of input power cord line disconnection protector | |
| CN2469581Y (en) | Multifunction autodistinguishing shockproof safety jack | |
| CN217486152U (en) | Alternating current transmission circuit and socket | |
| CN202949096U (en) | Power socket with overvoltage protection function | |
| CN219498415U (en) | Intelligent multifunctional socket | |
| CN211151526U (en) | Safety power-off protector | |
| CN212210966U (en) | Electronic switch circuit and electronic device applying same | |
| CN203760767U (en) | Grounding all-purpose self-checking plug head seat having null-line disconnection protection function | |
| CN211670630U (en) | Power-on protection circuit and device | |
| CN210838942U (en) | Thermal protection sparkless safety circuit for air jet loom brake disc | |
| CN203813142U (en) | Faulted neutral line protection and grounding universal self-checking single-phase three-pole connected connector assembly | |
| CN221351649U (en) | Intelligent fault early warning system | |
| CN212183105U (en) | Non-electricity and leakage tripping switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |