CN210201470U - Electromagnetic relay type leakage protector controlled by single chip microcomputer - Google Patents
Electromagnetic relay type leakage protector controlled by single chip microcomputer Download PDFInfo
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- CN210201470U CN210201470U CN201920753808.5U CN201920753808U CN210201470U CN 210201470 U CN210201470 U CN 210201470U CN 201920753808 U CN201920753808 U CN 201920753808U CN 210201470 U CN210201470 U CN 210201470U
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Abstract
The utility model relates to an electromagnetic relay type leakage protector controlled by a single chip microcomputer, which comprises a leakage detection circuit, a leakage signal conversion circuit, a single chip microcomputer control circuit, a switch power supply circuit, a relay K1 and a relay K2, wherein the relay K1 and the relay K2 are low-voltage direct current micro relays, the production cost of the leakage protector is reduced by using the low-voltage direct current micro relays, the high voltage in the circuit to be detected can be converted into the low voltage by arranging the switch power supply circuit, the alternating current is converted into the direct current, the voltage and the current in the circuit are in accordance with the working voltage and the current of the relay and the single chip microcomputer, the low-voltage direct current micro relays have smaller volume and large yield, the low-voltage direct current micro relays can be conveniently purchased and assembled on a large scale, the circuit to be detected can be accurately detected constantly by arranging a leakage detection chip and a detection, the single chip microcomputer can control the relay to operate, and the circuit to be detected can be disconnected after the relay loses power, so that the purpose of protecting the circuit is achieved.
Description
Technical Field
The utility model relates to an earth leakage protection field especially relates to an electromagnetic relay formula earth-leakage protector through single chip microcomputer control.
Background
The leakage protector, called leakage breaker for short, is mainly used for protecting the electric shock of human body with fatal danger when the equipment has leakage fault, has the functions of overload and short circuit protection, can be used for protecting the overload and short circuit of a circuit or a motor, and can also be used for the infrequent switching and starting of the circuit under normal conditions.
The existing mechanical leakage protector is unsafe during use, the electromagnetic relay type leakage protector generally adopts the high-voltage direct-current relay to control a circuit, the high-voltage direct-current relay is inconvenient to move due to the fact that the size of the high-voltage direct-current relay is large, the input end of the high-voltage direct-current relay can only be connected with the circuit to be detected, other parts are installed, the leakage protector is very troublesome to install, the high-voltage direct-current relay is low in general yield and high in price, purchasing can not be conducted on a large.
SUMMERY OF THE UTILITY MODEL
To the current situation of above-mentioned prior art, the utility model aims to solve the technical problem that an electromagnetic relay formula earth-leakage protector through single chip microcomputer control is provided to solve prior art problem.
The utility model provides a technical scheme that above-mentioned technical problem adopted does:
an electromagnetic relay type leakage protector controlled by a single chip microcomputer comprises a leakage detection circuit, a leakage signal conversion circuit, a single chip microcomputer control circuit, a switch power supply circuit, a relay K1 and a relay K2, wherein the relay K1 and the relay K2 are low-voltage direct-current micro relays, the relay K1 and the relay K2 are connected in series, the output end of the relay K1 is connected with a live wire of a device to be detected, the output end of the relay K2 is connected with a zero line of the device to be detected, the input end of the relay K1, the input end of the single chip microcomputer control circuit and the input end of the leakage signal conversion circuit are respectively and electrically connected with the output end of the switch power supply circuit, the input end of the switch power supply circuit is respectively and electrically connected with the live wire and the zero line, the input end of the relay K2 is electrically connected with the output end of the single chip microcomputer control circuit, and the signal, the signal input end of the leakage signal conversion circuit is electrically connected with the signal output end of the leakage detection circuit, the output end of the leakage signal conversion circuit is electrically connected with the input end of the leakage detection circuit, the output end of the leakage detection circuit is electrically connected with the zero line, the signal input end of the leakage detection circuit is sleeved on the zero line and the fire line, the high voltage in the circuit can be converted into the low voltage by arranging the switching power supply circuit, the low voltage can be used by the relays K1 and K2, the relays K1 and K2 can be replaced into the low-voltage direct-current micro relay, because the low-voltage direct-current micro relay is small in size, when the low-voltage direct-current micro relay is installed, a circuit to be detected does not need to be connected firstly, only the relays K1 and K2 are connected in series, the input end of the relay K2 is connected with the output end of the single chip microcomputer control circuit, the input end of the relay K1 is, and the relays K1 and K2 are controlled by the single chip microcomputer, so that the purpose of disconnecting the circuit is achieved.
Preferably, the electric leakage detection circuit includes the electric leakage detection chip, detects ring, step-down circuit and second filter circuit, step-down circuit is connected with the second filter circuit electricity, and this step-down circuit includes resistance R6 and resistance R7, and this resistance R6 and R7 are established ties, the second filter circuit includes electric capacity C6, and this electric capacity C6 and resistance R7 are established ties, the electric leakage detection chip parallel connection is at electric capacity C6's both ends, and this electric leakage detection chip is connected with the detection ring electricity, and the detection ring cover is established on live wire and zero line, detects the electric current in the circuit through the electromagnetic induction principle, and the electric leakage detection chip can detect the circuit constantly through detecting the ring, can play the effect of step-down and filter plate through setting up step-down circuit and second filter plate circuit, makes the voltage in the circuit reach the operating voltage of electric leakage detection chip, prevents that the electric leakage detection chip from burning out.
Preferably, the leakage signal conversion circuit comprises an optocoupler U2, a resistor R4, a triode Q2 and a capacitor C5, wherein a light receiving end of the optocoupler U2 is electrically connected with the resistor R4, the resistor R4 is grounded, a light emitting end of the optocoupler U2 is electrically connected with the triode Q2, a triode Q2 is electrically connected with the capacitor C5, the optocoupler U2 can convert an electric signal sent by the leakage detection chip, the leakage detection chip can control the light emitting end of the optocoupler U2 to emit light by controlling the on-off of the triode Q2, and the light receiving end of the optocoupler U2 can receive a corresponding optical signal and send a corresponding electric signal.
Preferably, the single chip microcomputer control circuit comprises a single chip microcomputer, a triode Q1, a capacitor C4 and a diode D2, the single chip microcomputer is electrically connected with a pole b of the triode Q1, a pole e of the triode Q1 is grounded, a pole C of the triode Q1 is electrically connected with an input end of a relay K2, one end of the capacitor C4 is electrically connected with the pole b of the triode Q1, the other end of the capacitor C4 is grounded, an anode of the diode D2 is electrically connected with an input end of the relay K2, a cathode of the diode D2 is electrically connected with an input end of the relay K1, and the single chip microcomputer can control the on-off of the relay K1 and the relay K2 after receiving corresponding detection signals, so that the on-off of a live wire and a zero wire is controlled.
Preferably, the switching power supply circuit comprises a resistance-capacitance voltage reduction circuit, a full-wave rectifying circuit, a filter circuit and a voltage reduction and stabilization circuit, the resistance-capacitance voltage reduction circuit is electrically connected with the full-wave rectifying circuit, the full-wave rectifying circuit is electrically connected with the filter circuit and the voltage reduction and stabilization circuit respectively, the filter circuit is electrically connected with the voltage reduction and stabilization circuit, the resistance-capacitance voltage reduction circuit comprises a capacitor C1 and a resistor R1, a capacitor C1 is connected in parallel with a resistor R1, the full-wave rectifying circuit comprises a rectifier bridge stack, the filter circuit comprises a voltage stabilizing tube DW, a capacitor C2 and a resistor R2, a resistor R2 is connected in series with a capacitor C2, a capacitor C2 is connected in parallel with the voltage stabilizing tube DW, the voltage reduction and stabilization circuit comprises a voltage stabilizing chip U1 and a capacitor C3, the voltage stabilizing chip U1 is electrically connected with the capacitor C3, the resistance-, the voltage in the circuit reaches the working voltage of the relay and the singlechip.
Preferably, the single chip microcomputer control circuit further comprises a temperature control circuit, a voltage detection circuit and a reset key, one end of the temperature control circuit is electrically connected with the voltage reduction and stabilizing circuit, the other end of the temperature control circuit is electrically connected with the single chip microcomputer, one end of the voltage detection circuit is electrically connected with the single chip microcomputer, the other end of the voltage detection circuit is electrically connected with the live wire and the zero wire respectively, the reset key is electrically connected with the single chip microcomputer, and the relays K1 and K2 can be reset by pressing the reset key.
Preferably, the voltage reduction circuit is further connected with a power indicator lamp and a rectifying circuit, the rectifying circuit is connected with the power indicator lamp in series, the power indicator lamp is an LED lamp, the rectifying circuit comprises a diode D1, and the power indicator lamp can display whether the circuit normally operates.
Preferably, the detection ring is further connected with a test key, the test key is respectively electrically connected with the live wire and the zero line, and the test key is pressed to simulate the electric leakage phenomenon, so that whether the electric leakage protector can normally work can be detected.
Compared with the prior art, the utility model has the advantages of:
through using the miniature relay of low pressure direct current to reduce earth-leakage protector's manufacturing cost, can purchase on a large scale, and can convert the high voltage in the circuit that awaits measuring into low-voltage through setting up switching power supply circuit, the alternating current converts the direct current into, make voltage and electric current in the circuit accord with the operating voltage and the electric current of relay and singlechip, and the miniature relay of low pressure direct current volume is less, whole equipment is convenient, and the production efficiency is improved, can carry out the accurate detection to the circuit that awaits measuring constantly through setting up electric leakage detection chip and detection ring, and give the singlechip to detection signal transmission, the singlechip controls the relay operation through the mode of closed or disconnection relay drive circuit, the relay can break off and wait to detect the circuit, thereby can carry out the mesh of protecting to the circuit constantly, the utility model relates to a rationally, accord with market demand.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic circuit diagram of the present invention;
fig. 3 is a schematic circuit diagram of the present invention.
Detailed Description
As shown in fig. 1-3, the device comprises an electric leakage detection circuit, an electric leakage signal conversion circuit, a single chip microcomputer control circuit, a switching power supply circuit, a relay K1 and a relay K2, wherein the relay K1 and the relay K2 are low-voltage direct-current micro relays, the relay K1 and the relay K2 are connected in series, the output end of the relay K1 is connected with a live wire of a device to be detected, the output end of the relay K2 is connected with a zero line of the device to be detected, the input end of the relay K1, the input end of the single chip microcomputer control circuit and the input end of the electric leakage signal conversion circuit are respectively and electrically connected with the output end of the switching power supply circuit, the input end of the switching power supply circuit is respectively and electrically connected with the live wire and the zero line, the input end of the relay K2 is electrically connected with the output end of the single chip, the signal input end of the leakage signal conversion circuit is electrically connected with the signal output end of the leakage detection circuit, the output end of the leakage signal conversion circuit is electrically connected with the input end of the leakage detection circuit, the output end of the leakage detection circuit is electrically connected with the zero line, and the signal input end of the leakage detection circuit is sleeved on the zero line and the live wire.
When the temperature-measuring device runs, a circuit to be detected is communicated, current sequentially flows through a resistance-capacitance voltage-reducing circuit, a full-wave rectifying circuit, a filter circuit and a voltage-reducing circuit to reach a relay K1, a relay K2, a single chip microcomputer and a leakage signal conversion circuit, the resistance-capacitance voltage-reducing circuit firstly reduces high voltage in the circuit to be detected, the full-wave rectifying circuit can convert alternating current into direct current, the filter circuit filters the alternating current, a voltage-reducing voltage stabilizing circuit can reduce the voltage in the circuit and stabilize the voltage within a specified range, a live wire and a zero wire are communicated after the relay K1 and the relay K2 are electrified, the single chip microcomputer starts to run after being electrified, a temperature sensor is arranged in a temperature control circuit in the single chip microcomputer control circuit and can detect the temperature in the leakage protector and send detection data to the single chip microcomputer, when the temperature is overhigh, the single chip microcomputer cuts off a b pole of a, the relay K1 and K2 lose power, the live wire and the zero line are disconnected, the leakage protector can be prevented from being burnt out due to overhigh temperature, a voltage detection circuit in a singlechip control circuit can detect the voltage between the live wire and the zero line and send the detected data to a singlechip, if the voltage of the relay K1 and the relay K2 is lost, the live wire and the zero line are disconnected, so that the circuit is protected, the current passes through a leakage signal conversion circuit and then sequentially passes through a voltage reduction circuit and a second filter circuit to reach the leakage detection chip, the leakage detection chip starts to work after being powered on, the second filter circuit filters the current, the voltage reduction circuit can reduce the voltage in the circuit, the reduced voltage can meet the standard of the working voltage of the leakage detection chip, a detection ring connected with the leakage detection chip detects the current in the circuit through the electromagnetic induction principle and sends the detected signal to the leakage detection chip, the leakage detection chip receives the signal and then judges, and controls the on-off of the triode Q2, the triode Q2 makes the light emitting end of the optocoupler U2 powered and lighted, the triode Q2 makes the light emitting end of the optocoupler U2 powered and unpowered after being switched off, the light receiving end of the optocoupler U2 receives the light emitting signal of the triode Q2 and then sends the light emitting signal to the singlechip in the form of an electric signal, the singlechip receives the signal and then judges and controls the relays K1 and K2 powered or powered and powered off, the singlechip controls the relays K1 and K2 to be switched off, the live wire and the zero wire are switched off so as to protect the circuit, the user can manually press the reset key after the relays K1 and K2 are switched off, and the singlechip controls the relays K1 and K2 powered after obtaining the electric signal.
Only need establish ties relay K1 and K2 during the installation, relay K1's output is connected with the live wire of examining equipment, relay K2's output is connected with the zero line of examining equipment, relay K2's input is connected with single chip microcomputer control circuit's output, relay K1's input links to each other with step-down voltage stabilizing circuit and just can accomplish the installation, and the miniature relay volume of low pressure direct current is less, whole equipment is convenient, and the production efficiency is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. An electromagnetic relay type leakage protector controlled by a single chip microcomputer is characterized by comprising a leakage detection circuit, a leakage signal conversion circuit, a single chip microcomputer control circuit, a switching power supply circuit, a relay K1 and a relay K2, wherein the relay K1 and the relay K2 are low-voltage direct-current micro relays, the relay K1 and the relay K2 are connected in series, the output end of the relay K1 is connected with a live wire of a device to be detected, the output end of the relay K2 is connected with a zero line of the device to be detected, the input end of the relay K1, the input end of the single chip microcomputer control circuit and the input end of the leakage signal conversion circuit are respectively and electrically connected with the output end of the switching power supply circuit, the input end of the switching power supply circuit is respectively and electrically connected with the live wire and the zero line, the input end of the relay K2 is electrically connected with the output end of the single chip microcomputer control circuit, and the signal input end, the signal input end of the leakage signal conversion circuit is electrically connected with the signal output end of the leakage detection circuit, the output end of the leakage signal conversion circuit is electrically connected with the input end of the leakage detection circuit, the output end of the leakage detection circuit is electrically connected with the zero line, and the signal input end of the leakage detection circuit is sleeved on the zero line and the live wire.
2. An electromagnetic relay type earth leakage protector controlled by a single chip microcomputer according to claim 1, characterized in that said earth leakage detecting circuit comprises an earth leakage detecting chip, a detecting ring, a voltage dropping circuit and a second filter circuit, said voltage dropping circuit is electrically connected with the second filter circuit, said voltage dropping circuit comprises a resistor R6 and a resistor R7, said resistor R6 is connected with R7 in series, said second filter circuit comprises a capacitor C6, said capacitor C6 is connected with a resistor R7 in series, said earth leakage detecting chip is connected in parallel with two ends of a capacitor C6, said earth leakage detecting chip is electrically connected with the detecting ring.
3. An electromagnetic relay type earth leakage protector controlled by a single chip microcomputer according to claim 2, characterized in that the earth leakage signal conversion circuit comprises an optocoupler U2, a resistor R4, a triode Q2 and a capacitor C5, wherein the optocoupler U2 is electrically connected with a resistor R4 at a light receiving end, the resistor R4 is grounded, the optocoupler U2 is electrically connected with a triode Q2 at a light emitting end, and the triode Q2 is electrically connected with the capacitor C5.
4. A leakage protector of electromagnetic relay type controlled by a single chip microcomputer according to claim 3, wherein said single chip microcomputer control circuit comprises a single chip microcomputer, a transistor Q1, a capacitor C4 and a diode D2, said single chip microcomputer is electrically connected with the b pole of the transistor Q1, the e pole of the transistor Q1 is grounded, the C pole of the transistor Q1 is electrically connected with the input terminal of the relay K2, one end of the capacitor C4 is electrically connected with the b pole of the transistor Q1, the other end of the capacitor C4 is grounded, the anode of the diode D2 is electrically connected with the input terminal of the relay K2, and the cathode of the diode D2 is electrically connected with the input terminal of the relay K1.
5. An electromagnetic relay type earth leakage protector controlled by a single chip computer according to claim 4, it is characterized in that the switch power supply circuit comprises a resistance-capacitance voltage reduction circuit, a full-wave rectification circuit, a filter circuit and a voltage reduction and stabilization circuit, the resistance-capacitance voltage reduction circuit is electrically connected with a full-wave rectification circuit which is respectively electrically connected with the filter circuit and the voltage reduction and voltage stabilization circuit, the filter circuit is electrically connected with the voltage reduction and stabilizing circuit, the resistance-capacitance voltage reduction circuit comprises a capacitor C1 and a resistor R1, the capacitor C1 is connected with the resistor R1 in parallel, the full-wave rectification circuit comprises a rectifier bridge stack, the filter circuit comprises a voltage stabilizing tube DW, a capacitor C2 and a resistor R2, the resistor R2 is connected with the capacitor C2 in series, the capacitor C2 is connected in parallel with the voltage regulator tube DW, the voltage reduction and stabilization circuit comprises a voltage stabilization chip U1 and a capacitor C3, and the voltage stabilization chip U1 is electrically connected with the capacitor C3.
6. The electromagnetic relay type leakage protector controlled by the single chip microcomputer according to claim 5, wherein the single chip microcomputer control circuit further comprises a temperature control circuit, a voltage detection circuit and a reset key, one end of the temperature control circuit is electrically connected with the voltage reduction and stabilization circuit, the other end of the temperature control circuit is electrically connected with the single chip microcomputer, one end of the voltage detection circuit is electrically connected with the single chip microcomputer, the other end of the voltage detection circuit is electrically connected with the live wire and the zero wire respectively, and the reset key is electrically connected with the single chip microcomputer.
7. An electromagnetic relay type earth leakage protector controlled by a single chip microcomputer according to claim 6, wherein a power indicator lamp and a rectifying circuit are connected to the voltage reducing circuit, the rectifying circuit is connected in series with the power indicator lamp, the power indicator lamp is an LED lamp, and the rectifying circuit comprises a diode D1.
8. The electromagnetic relay type earth leakage protector controlled by the single chip microcomputer according to claim 7, wherein the test ring is further connected with test keys, and the test keys are respectively electrically connected with the live wire and the neutral wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920753808.5U CN210201470U (en) | 2019-05-24 | 2019-05-24 | Electromagnetic relay type leakage protector controlled by single chip microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920753808.5U CN210201470U (en) | 2019-05-24 | 2019-05-24 | Electromagnetic relay type leakage protector controlled by single chip microcomputer |
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| Publication Number | Publication Date |
|---|---|
| CN210201470U true CN210201470U (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920753808.5U Active CN210201470U (en) | 2019-05-24 | 2019-05-24 | Electromagnetic relay type leakage protector controlled by single chip microcomputer |
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| Country | Link |
|---|---|
| CN (1) | CN210201470U (en) |
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- 2019-05-24 CN CN201920753808.5U patent/CN210201470U/en active Active
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