CN108199346B - Residual current operated circuit breaker circuit with self-diagnosis and detection function - Google Patents
Residual current operated circuit breaker circuit with self-diagnosis and detection function Download PDFInfo
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- CN108199346B CN108199346B CN201810033644.9A CN201810033644A CN108199346B CN 108199346 B CN108199346 B CN 108199346B CN 201810033644 A CN201810033644 A CN 201810033644A CN 108199346 B CN108199346 B CN 108199346B
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- 238000004092 self-diagnosis Methods 0.000 title claims abstract description 50
- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 230000005611 electricity Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 80
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 42
- 229910052710 silicon Inorganic materials 0.000 claims description 42
- 239000010703 silicon Substances 0.000 claims description 42
- 238000003745 diagnosis Methods 0.000 claims description 29
- 238000012360 testing method Methods 0.000 claims description 19
- 238000010521 absorption reaction Methods 0.000 claims description 15
- 238000002405 diagnostic procedure Methods 0.000 claims description 13
- 230000002457 bidirectional effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- 230000001960 triggered effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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Abstract
A residual current operated circuit breaker circuit with self-diagnosis and detection functions comprises a power supply circuit, a leakage signal acquisition control circuit and a tripping circuit; the input end of the power supply circuit is connected with an external power supply for taking electricity, the output end of the power supply circuit is connected with the tripping circuit and the leakage signal acquisition control circuit for providing working power for the tripping circuit, the power supply circuit also comprises a zero sequence transformer TA, the input end of the leakage signal acquisition control circuit is connected with two ends of a secondary loop lead of the zero sequence transformer TA, and the output end of the leakage signal acquisition control circuit is connected with the input end of the tripping circuit; the self-diagnosis control circuit is used for simulating the leakage signal in the negative half period of the power supply, and sends the simulated leakage signal to the leakage signal acquisition control circuit for leakage detection.
Description
Technical Field
The invention relates to the field of piezoelectric devices, in particular to a residual current operated circuit breaker circuit with a self-diagnosis and detection function.
Background
At present, the residual current acts on the circuit breaker, and the current detection means of customers is to press a test button on a product every month, simulate a leakage signal, and judge whether the circuit breaker trips or not as a judging basis, so as to judge whether the product has a failure phenomenon or not. The manual operation is complicated, the operation is improper and the electric shock is dangerous.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a residual current operated circuit breaker circuit with a self-diagnosis detection function, which has the advantages of simple and compact structure, safe and stable performance and accurate and reliable detection.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A residual current operated circuit breaker circuit with self-diagnosis and detection functions comprises a power supply circuit, a leakage signal acquisition control circuit and a tripping circuit; the input end of the power supply circuit is connected with an external power supply for taking electricity, the output end of the power supply circuit is connected with the tripping circuit and the leakage signal acquisition control circuit for providing working power for the tripping circuit, the power supply circuit also comprises a zero sequence transformer TA, the input end of the leakage signal acquisition control circuit is connected with two ends of a secondary loop lead of the zero sequence transformer TA, and the output end of the leakage signal acquisition control circuit is connected with the input end of the tripping circuit; the self-diagnosis control circuit is used for simulating the leakage signal in the negative half period of the power supply, and sends the simulated leakage signal to the leakage signal acquisition control circuit for leakage detection.
Further, the self-diagnosis control circuit comprises a diagnosis chip U2 and a triode Q2; the diagnosis chip U2 is connected with the base electrode of the triode Q2, the collector electrode of the triode Q2 is connected with the power supply N of the external power supply, the diagnosis chip U2 is connected with the power supply L of the external power supply, the emitter electrode of the triode Q2 is grounded, and the diagnosis chip U2 is connected with the tripping circuit; after the breaker is switched on and electrified, when the diagnosis chip U2 detects that the phase is close to the end of the positive half period, a period test process is generated in the negative half period of the phase, the diagnosis chip U2 controls the triode Q2 to be conducted, the leakage signal acquisition control circuit detects a leakage signal, and the diagnosis chip U2 judges whether the circuit has faults or not through whether the tripping circuit is conducted or not.
Further, the self-diagnosis control circuit further comprises a diode VD7, a resistor R18, a resistor R24, a capacitor C6, a resistor R17, a capacitor C5, a resistor R22 and a diode VD6; the positive pole of diode VD7 is connected with external power supply's power N, diode VD 7's negative pole is connected with triode Q2's collecting electrode through resistance R24, triode Q2's projecting pole ground connection, triode Q2's base passes through resistance R17 and is connected with diagnostic chip U2's sixth pin, electric capacity C6 parallel connection is between triode Q2's base and triode Q2's projecting pole, resistance R18's one end is connected with external power supply's power L, the other end is connected with diagnostic chip U2's fourth pin, electric capacity C5 parallel connection is between diagnostic chip U2's second pin and diagnostic chip U2's third pin, diagnostic chip U2's second pin ground connection, diagnostic chip U2's third pin is connected with the step-down circuit, one end after resistance R22 and diode VD6 are parallelly connected is connected with diagnostic chip U2's first pin, the other end is connected with the tripping circuit.
Further, the automatic power-off circuit and/or the alarm circuit are/is also included.
Further, the automatic power-off circuit comprises a resistor R25, a controllable silicon Q4 and a capacitor C12; one end of a resistor R25 is connected with the self-diagnosis control circuit, the other end of the resistor R25 is connected with the control electrode of the controlled silicon Q4, one end of a capacitor C12 is connected with the control electrode of the controlled silicon Q4, the other end of the capacitor C12 is grounded, the cathode of the controlled silicon Q4 is grounded, and the anode of the controlled silicon Q4 is connected with a tripping coil KA of a tripping circuit.
Further, the circuit also comprises an alarm circuit, and the alarm circuit alarms when the circuit fails; the alarm circuit comprises a light emitting diode D9 and a resistor R16, wherein one end of the light emitting diode D9 and the resistor R16 which are connected in series is connected with the self-diagnosis control circuit, and the other end of the light emitting diode D9 and the resistor R16 is grounded.
Further, the circuit also comprises an alarm circuit, and the alarm circuit alarms when the circuit fails; the alarm circuit comprises a resistor R26, a loudspeaker LS, a capacitor C12, a resistor R27, a resistor R28, a resistor R29 and a resistor R30; one end of a resistor R26 is connected with the self-diagnosis control circuit, the other end of the resistor R26 is connected with the base electrode of a triode Q4, the emitter electrode of the triode Q4 is connected with a loudspeaker LS, one end of a capacitor C12 is connected with the collector electrode of the triode Q4, and the other end of the capacitor C is grounded; one end of the resistor R27 connected in parallel with the resistor R28 and one end of the resistor R29 connected in parallel with the resistor R30 are connected, the other end of the resistor R27 connected in parallel with the resistor R28 is connected with the collector of the triode Q4, and the other end of the resistor R29 connected in parallel with the resistor R30 is connected with the tripping coil KA of the tripping circuit.
Further, the external power supply is a two-phase power supply and comprises a power supply L phase and a power supply N phase, and the power supply circuit comprises a surge absorption circuit, a voltage reduction circuit and a rectifying circuit; the input end of the surge absorption circuit is connected with an external power supply to carry out surge absorption protection on the input power supply, the output end of the surge absorption circuit is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the voltage reduction circuit and the input end of the tripping circuit, and the output end of the voltage reduction circuit is connected with the input end of the leakage signal acquisition control circuit and the input end of the self-diagnosis control circuit.
Further, the surge absorption circuit comprises a piezoresistor RV1 and a piezoresistor RV2, and the piezoresistor RV1 and the piezoresistor RV2 are respectively connected in parallel between the power supply L phase and the power supply N phase; the rectifying circuit is a full-wave rectifying bridge, the rectifying bridge comprises a diode VD2, a diode VD3, a diode VD4 and a diode VD5, two opposite input ends of the rectifying bridge are respectively connected with a power supply L phase and a power supply N, the positive poles of the same polarity output ends of the rectifying bridge are grounded, and the negative poles of the same polarity output ends of the rectifying bridge are connected with the input ends of the voltage reduction circuit and the input ends of the tripping circuit.
Further, the voltage reducing circuit comprises a first voltage reducing circuit for reducing the voltage of the leakage signal acquisition control circuit and a second voltage reducing circuit for reducing the voltage of the self-diagnosis control circuit; the first voltage reduction circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a resistor R9, wherein the resistor R1 is connected with the resistor R2, the resistor R3 is connected with the resistor R4, the resistor R5 is connected with the resistor R6 in series and then is connected with the resistor R6 in parallel, one end of the parallel is connected with the output end of the rectifying circuit, the other end of the parallel is connected with one end of the parallel of the resistor R7, the resistor R8 and the resistor R9, and the other end of the parallel of the resistor R7, the resistor R8 and the resistor R9 is connected with the input end of the leakage signal acquisition control circuit; the second voltage reduction circuit comprises a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a resistor R15, wherein the resistor R10, the resistor R11, the resistor R12, the resistor R13, the resistor R14 and the resistor R15 are respectively connected in series and then connected in parallel, one end of the parallel is connected with the output end of the rectifying circuit, and the other end of the parallel is connected with the input end of the self-diagnosis control circuit.
Further, the tripping circuit comprises a tripping coil KA, a diode VD1 and a controllable silicon Q3; one end of a tripping coil KA is connected with a power supply L of an external power supply, the other end of the tripping coil KA is connected with the positive electrode of a diode VD1, the negative electrode of the diode VD1 is connected with the anode of a silicon controlled rectifier Q3, the cathode of the silicon controlled rectifier Q3 is grounded, the control electrode of the silicon controlled rectifier Q3 is connected with a leakage signal acquisition control circuit, and the intermediate nodes of the diode VD1 and the silicon controlled rectifier Q3 are connected with a self-diagnosis control circuit.
Further, the leakage signal acquisition control circuit comprises a control chip U1, a bidirectional diode Q1, a debugging resistor R21, a resistor R19, a resistor R20, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C7; the power supply L phase and the power supply N phase of the external power supply pass through the zero-sequence transformer TA, and the debugging resistor R21 and the bidirectional diode Q1 are sequentially connected in parallel with the two ends of a secondary loop lead of the zero-sequence transformer TA; the two ends of the bidirectional diode Q1 are respectively connected with a capacitor C10 and a capacitor C11, the other ends of the capacitor C10 and the capacitor C11 are grounded, one ends of a resistor R19 and a resistor R20 are respectively connected with the capacitor C10 and the capacitor C11, the other ends of the resistor R20 are respectively connected with a second pin of the control chip U1 and a third pin of the control chip U1, a capacitor C4 is connected in parallel between the second pin of the control chip U1 and the third pin of the control chip U1, an eighth pin of the control chip U1 is connected with a voltage reducing circuit, one end of the capacitor C7 is connected with the eighth pin of the control chip U1, the other end of the capacitor C7 is grounded, the capacitor C2 is connected in parallel between the fourth pin of the control chip U1 and a fifth pin of the control chip U1, the capacitor C1 is connected in parallel between the fourth pin of the control chip U1 and a sixth pin of the control chip U1, the capacitor C3 is connected in parallel between the fourth pin of the control chip U1 and a seventh pin of the control chip U1, and the fourth pin of the control chip U1 is connected with the voltage reducing circuit.
Further, the leakage testing circuit comprises a normally open testing switch S2 and a testing resistor R23, and the normally open testing switch S2 and the testing resistor R23 are connected in series between a power supply L phase and a power supply N phase of an external power supply.
The invention relates to a residual current operated circuit breaker circuit with a self-diagnosis detection function, which comprises a power supply circuit, a leakage signal acquisition control circuit, a tripping circuit and a self-diagnosis control circuit for detecting an integrated leakage tripping circuit, wherein the input end of the self-diagnosis control circuit is connected with an external power supply and used for detecting the whole leakage tripping circuit on line without power off, the self-diagnosis control circuit can send out an analog leakage signal to the leakage signal acquisition control circuit, the whole detection process can be carried out in a negative half period of the power supply, and when any element in the whole leakage tripping circuit is damaged, the tripping circuit is not operated, and then a circuit fault is detected. The invention sets the automatic power-off circuit, when the circuit has faults, the controllable silicon is triggered to be conducted to cause the tripping coil to trip, and the automatic power-off tripping is performed after the faults are automatically detected, so that the electricity utilization safety is ensured. The self-diagnosis control circuit is connected with the alarm circuit, and alarms through the alarm circuit when the circuit has faults, and the embodiment adopts a light emitting diode to emit light to instruct or flash to alarm, and the alarm circuit can also adopt a buzzer and the like to carry out alarm prompt. The invention respectively adopts two paths of voltage reduction circuits to respectively reduce the voltage of the leakage signal acquisition control circuit and the self-diagnosis control circuit, thereby ensuring the electricity utilization safety of the chip.
Drawings
FIG. 1 is a schematic diagram of a residual current operated circuit breaker circuit according to the present invention;
FIG. 2 is a circuit diagram of one embodiment of a residual current operated circuit breaker circuit according to the present invention;
fig. 3 is a circuit diagram of a first embodiment of the residual current operated circuit breaker circuit of the invention;
FIG. 4 is a circuit diagram of another embodiment of a residual current operated circuit breaker circuit according to the present invention;
Fig. 5 is a circuit diagram of another embodiment of the residual current operated circuit breaker circuit of the invention.
Detailed Description
Specific embodiments of the residual current operated circuit breaker circuit with self-diagnostic test function of the present invention are further described below in conjunction with the examples presented in figures 1 through 5. The residual current operated circuit breaker with self-diagnostic test function of the present invention is not limited to the description of the following embodiments.
As shown in fig. 1-5, the residual current operated circuit breaker with self-diagnosis and detection function of the invention comprises a power supply circuit, a leakage signal acquisition control circuit and a tripping circuit; the input end of the power supply circuit is connected with an external power supply for taking electricity, the output end of the power supply circuit is connected with the tripping circuit and the leakage signal acquisition control circuit for providing working power for the tripping circuit, the power supply circuit also comprises a zero sequence transformer TA, the input end of the leakage signal acquisition control circuit is connected with two ends of a secondary loop lead of the zero sequence transformer TA, and the output end of the leakage signal acquisition control circuit is connected with the input end of the tripping circuit for providing tripping signals for the tripping circuit; the self-diagnosis control circuit is used for simulating the leakage signal and sending the simulated leakage signal to the leakage signal acquisition control circuit for leakage detection. The invention relates to a residual current operated circuit breaker circuit with a self-diagnosis detection function, which comprises a power supply circuit, a leakage signal acquisition control circuit, a tripping circuit and a self-diagnosis control circuit for detecting the whole leakage tripping circuit, wherein the input end of the self-diagnosis control circuit is connected with an external power supply for detecting the whole leakage tripping circuit in an on-line uninterrupted manner, the self-diagnosis control circuit can send out an analog leakage signal to the leakage signal acquisition control circuit in a negative half cycle of the power supply, the whole detection process can be carried out in the negative half cycle of the power supply, and when any element in the whole leakage tripping circuit is damaged, the tripping circuit is not operated, so that the circuit fault is detected.
As shown in fig. 2, the self-diagnosis control circuit includes a diagnosis chip U2, a triode Q2, a diode VD7, a resistor R18, a resistor R24, a capacitor C6, a resistor R17, a capacitor C5, a resistor R22 and a diode VD6; the positive pole of diode VD7 is connected with external power supply's power N, diode VD 7's negative pole is connected with triode Q2's collecting electrode through resistance R24, triode Q2's projecting pole ground connection, triode Q2's base passes through resistance R17 and is connected with diagnostic chip U2's sixth pin, electric capacity C6 parallel connection is between triode Q2's base and triode Q2's projecting pole, resistance R18's one end is connected with external power supply's power L, the other end is connected with diagnostic chip U2's fourth pin, electric capacity C5 parallel connection is between diagnostic chip U2's second pin and diagnostic chip U2's third pin, diagnostic chip U2's second pin ground connection, diagnostic chip U2's third pin is connected with the step-down circuit, one end after resistance R22 and diode VD6 are parallelly connected is connected with diagnostic chip U2's first pin, the other end is connected with the tripping circuit, diagnostic chip U2's fourth pin is connected with alarm circuit. The self-diagnosis control circuit has simple circuit structure and low cost.
As shown in fig. 3, the automatic power-off circuit further comprises an automatic power-off circuit, wherein the automatic power-off circuit comprises a resistor R25, a silicon controlled rectifier Q4 and a capacitor C12; one end of a resistor R25 is connected with a fifth pin of the diagnosis chip U2, the other end of the resistor R25 is connected with a control electrode of the controlled silicon Q4, one end of a capacitor C12 is connected with the control electrode of the controlled silicon Q4, the other end of the capacitor C12 is grounded, a cathode of the controlled silicon Q4 is grounded, and an anode of the controlled silicon Q4 is connected with a tripping coil KA of a tripping circuit. The invention sets the automatic power-off circuit, when the circuit has faults, the controllable silicon Q4 is triggered to be conducted, the tripping coil KA is caused to trip, and the automatic power-off tripping is carried out after the faults are automatically detected, so that the electricity safety is ensured.
As shown in fig. 2, the tripping device also comprises an alarm circuit which is connected with the tripping device and alarms when the tripping device fails; the alarm circuit comprises a light emitting diode D9 and a resistor R16, wherein one end of the light emitting diode D9 and the resistor R16 which are connected in series is connected with the self-diagnosis control circuit, and the other end of the light emitting diode D9 and the resistor R16 is grounded. The self-diagnosis control circuit is connected with the alarm circuit, and alarms through the alarm circuit when the circuit has faults, and the embodiment adopts a light emitting diode to emit light to instruct or flash to alarm, and the alarm circuit can also adopt a buzzer and the like to carry out alarm prompt.
As shown in fig. 4, another embodiment of the alarm circuit is: the alarm circuit comprises a resistor R26, a loudspeaker LS, a capacitor C12, a resistor R27, a resistor R28, a resistor R29 and a resistor R30; one end of a resistor R26 is connected with a fifth pin of the diagnosis chip U2, the other end of the resistor R26 is connected with a base electrode of a triode Q4, an emitter electrode of the triode Q4 is connected with a loudspeaker LS, one end of a capacitor C12 is connected with a collector electrode of the triode Q4, and the other end of the capacitor C12 is grounded; one end of the resistor R27 connected in parallel with the resistor R28 and one end of the resistor R29 connected in parallel with the resistor R30 are connected, the other end of the resistor R27 connected in parallel with the resistor R28 is connected with the collector of the triode Q4, and the other end of the resistor R29 connected in parallel with the resistor R30 is connected with the tripping coil KA of the tripping circuit. When the circuit has faults, the circuit is conducted to cause the loudspeaker LS to buzzing after passing through the resistor R26 and the triode Q4, and the voice control early warning function is provided.
As shown in fig. 2, the leakage signal acquisition control circuit includes a control chip U1, a bidirectional diode Q1, a debug resistor R21, a resistor R19, a resistor R20, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, and a capacitor C7; the power supply L phase and the power supply N phase of the external power supply pass through the zero-sequence transformer TA, and the debugging resistor R21 and the bidirectional diode Q1 are sequentially connected in parallel with the two ends of a secondary loop lead of the zero-sequence transformer TA; the two ends of the bidirectional diode Q1 are respectively connected with a capacitor C10 and a capacitor C11, the other ends of the capacitor C10 and the capacitor C11 are grounded, one ends of a resistor R19 and a resistor R20 are respectively connected with the capacitor C10 and the capacitor C11, the other ends of the resistor R20 are respectively connected with a second pin of the control chip U1 and a third pin of the control chip U1, a capacitor C4 is connected in parallel between the second pin of the control chip U1 and the third pin of the control chip U1, an eighth pin of the control chip U1 is connected with a voltage reducing circuit, one end of the capacitor C7 is connected with the eighth pin of the control chip U1, the other end of the capacitor C7 is grounded, the capacitor C2 is connected in parallel between the fourth pin of the control chip U1 and a fifth pin of the control chip U1, the capacitor C1 is connected in parallel between the fourth pin of the control chip U1 and a sixth pin of the control chip U1, the capacitor C3 is connected in parallel between the fourth pin of the control chip U1 and a seventh pin of the control chip U1, and the fourth pin of the control chip U1 is connected with the voltage reducing circuit. When leakage current is generated, signals sensed by the zero sequence transformer are collected by 1 pin and 2 pin of the control chip U1 after being filtered by components such as the debugging resistor R21, the bidirectional diode Q1, the resistor R19, the resistor R20, the capacitor C4, the capacitor C10, the capacitor C11, the capacitor C7 and the like. And performing signal processing and judgment on peripheral capacitors C1, C2 and C3 of pins 5,6 and 7 of the control chip U1, and triggering the silicon controlled rectifier Q3 if the leakage current reaches a set value.
As shown in fig. 2, the trip circuit includes a trip coil KA, a diode VD1 and a thyristor Q3; one end of a tripping coil KA is connected with a power supply L of an external power supply, the other end of the tripping coil KA is connected with the positive electrode of a diode VD1, the negative electrode of the diode VD1 is connected with the anode of a silicon controlled rectifier Q3, the cathode of the silicon controlled rectifier Q3 is grounded, the control electrode of the silicon controlled rectifier Q3 is connected with a leakage signal acquisition control circuit, and the intermediate nodes of the diode VD1 and the silicon controlled rectifier Q3 are connected with a self-diagnosis control circuit. When the leakage current reaches a set value in operation, the control chip U1 collects signals and outputs high level to the G electrode of the silicon controlled rectifier Q3. After the thyristor Q3 is conducted, a loop is formed with the diode VD1 and the tripping coil, and the tripping coil passes through a large current, so that the circuit breaker is driven to break off the power supply.
As shown in fig. 1 and 2, the external power supply is a two-phase power supply and comprises a power supply L phase and a power supply N phase, and the power supply circuit comprises a surge absorption circuit, a voltage reduction circuit and a rectifying circuit; the input end of the surge absorption circuit is connected with an external power supply to carry out surge absorption protection on the input power supply, the output end of the surge absorption circuit is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the voltage reduction circuit and the input end of the tripping circuit, and the output end of the voltage reduction circuit is connected with the input end of the leakage signal acquisition control circuit and the input end of the self-diagnosis control circuit. Obviously, more phases can be used for the external power supply. Specifically, the surge absorption circuit comprises a piezoresistor RV1 and a piezoresistor RV2, and the piezoresistor RV1 and the piezoresistor RV2 are respectively connected in parallel between a power supply L phase and a power supply N phase. The rectifying circuit is a full-wave rectifying bridge, the rectifying bridge comprises a diode VD2, a diode VD3, a diode VD4 and a diode VD5, two opposite input ends of the rectifying bridge are respectively connected with a power supply L phase and a power supply N, the positive poles of the same polarity output ends of the rectifying bridge are grounded, and the negative poles of the same polarity output ends of the rectifying bridge are connected with the input ends of the voltage reduction circuit and the input ends of the tripping circuit. The rectifying circuit may also employ half-wave rectification. Fig. 5 shows an embodiment in which no varistor RV2 is provided.
As shown in fig. 2, the voltage reducing circuit includes a first voltage reducing circuit that reduces the voltage of the leakage signal acquisition control circuit and a second voltage reducing circuit that reduces the voltage of the self-diagnosis control circuit; the first voltage reduction circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a resistor R9, wherein the resistor R1 is connected with the resistor R2, the resistor R3 is connected with the resistor R4, the resistor R5 is connected with the resistor R6 in series and then is connected with the resistor R6 in parallel, one end of the parallel is connected with the output end of the rectifying circuit, the other end of the parallel is connected with one end of the parallel of the resistor R7, the resistor R8 and the resistor R9, and the other end of the parallel of the resistor R7, the resistor R8 and the resistor R9 is connected with the input end of the leakage signal acquisition control circuit; the second voltage reduction circuit comprises a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a resistor R15, wherein the resistor R10, the resistor R11, the resistor R12, the resistor R13, the resistor R14 and the resistor R15 are respectively connected in series and then connected in parallel, one end of the parallel is connected with the output end of the rectifying circuit, and the other end of the parallel is connected with the input end of the self-diagnosis control circuit. The invention respectively adopts two paths of voltage reduction circuits to respectively reduce the voltage of the leakage signal acquisition control circuit and the self-diagnosis control circuit, thereby ensuring the electricity utilization safety of the chip.
As shown in fig. 2, the leakage test circuit further comprises a normally open test switch S2 and a test resistor R23, and the normally open test switch S2 and the test resistor R23 are connected in series between the power L phase and the power N phase of the external power supply.
The following describes the operation of the self-diagnostic test circuit of the present invention with reference to fig. 1 and 2:
during normal operation, the controllable silicon Q3 controls the coil KA of the release, when the leakage current reaches a set value, the coil release is attracted, and the load breaker is disconnected, so that personal safety is guaranteed. After the breaker is switched on and electrified, when the 4 th foot of the diagnosis chip U2 detects that the phase is close to the end of the positive half period, a test process of 10ms is generated once in the negative half period of the phase, and at the moment, the 6 th foot of the diagnosis chip U2 controls the triode Q2 to be conducted. At this time, the control chip U1 detects the leakage signal and is in a pulse output state at the 5 th pin, the silicon controlled rectifier Q3 is conducted, and the live wire L is in a near zero state, so that the diode VD1 is reversely biased, the coil KA is not attracted, and the circuit breaker is not tripped; meanwhile, the 1 st pin of the diagnosis chip U2 outputs high level, power is supplied to the anode of the silicon controlled rectifier Q3 after passing through the diode VD6, and when the silicon controlled rectifier Q3 is driven, the 1 st pin voltage of the diagnosis chip U2 is pulled down, and the internal judgment of the diagnosis chip U2 shows that the current pass is performed, so that the silicon controlled rectifier is proved to work normally. If the low level is not detected, the operation is repeated for 3 times, if the low level is not detected, the silicon controlled rectifier is proved to work abnormally, and at the moment, a 5-pin output signal of the diagnosis chip U2 drives an alarm lamp or a buzzer to alarm.
1. The self-detection circuit is divided into two parts, namely a leakage detection chip (a diagnosis chip) and a main control chip (a control chip U1), and has the advantages of high integration level, high product consistency, fewer external elements, simple application, good reliability and strong anti-interference performance.
2. The self-detection circuit scheme can realize AC type electric leakage detection and can automatically and periodically complete a self-detection function. The self-detection chip is internally provided with a timing circuit, and an automatic periodic self-detection function is invoked through an internal digital control logic.
3. The self-detection circuit scheme can realize the performance test of key elements such as leakage chips, transformers, thyristors, trips and the like and circuits.
4. The self-detection circuit scheme can be used for detecting the phase line and the voltage of the phase line.
5. The self-detection circuit scheme simultaneously has the advantages of sampling external AC frequency as a clock standard and integrating an internal high-precision oscillating circuit, and can provide a high-precision timing function for a system.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (11)
1. The utility model provides a take residual current operated circuit breaker circuit of self-diagnosis detection function which characterized in that: the leakage signal acquisition control circuit comprises a power supply circuit, a leakage signal acquisition control circuit and a tripping circuit; the input end of the power supply circuit is connected with an external power supply for taking electricity, the output end of the power supply circuit is connected with the tripping circuit and the leakage signal acquisition control circuit for providing working power for the tripping circuit, the power supply circuit also comprises a zero sequence transformer TA, the input end of the leakage signal acquisition control circuit is connected with two ends of a secondary loop lead of the zero sequence transformer TA, and the output end of the leakage signal acquisition control circuit is connected with the input end of the tripping circuit for providing tripping signals for the tripping circuit;
The self-diagnosis control circuit is used for simulating the leakage signal in the negative half period of the power supply, and sends the simulated leakage signal to the leakage signal acquisition control circuit for leakage detection;
the self-diagnosis control circuit comprises a diagnosis chip U2 and a triode Q2; the diagnosis chip U2 is connected with the base electrode of the triode Q2, the collector electrode of the triode Q2 is connected with the power supply N of the external power supply, the diagnosis chip U2 is connected with the power supply L of the external power supply, the emitter electrode of the triode Q2 is grounded, and the diagnosis chip U2 is connected with the tripping circuit;
the automatic power-off circuit comprises a resistor R25, a controllable silicon Q4 and a capacitor C12; one end of a resistor R25 is connected with a diagnosis chip U2 of the self-diagnosis control circuit, the other end of the resistor R25 is connected with a control electrode of a controlled silicon Q4, one end of a capacitor C12 is connected with the control electrode of the controlled silicon Q4, the other end of the capacitor C12 is grounded, a cathode of the controlled silicon Q4 is grounded, and an anode of the controlled silicon Q4 is connected with a tripping coil KA of a tripping circuit;
After the circuit breaker is switched on and electrified, when the diagnosis chip U2 detects that the phase is close to the end of a positive half period, a period test process is generated in the negative half period of the phase, the diagnosis chip U2 controls the triode Q2 to be conducted, the leakage signal acquisition control circuit detects a leakage signal, the diagnosis chip U2 judges whether the circuit has faults or not through the conduction of a tripping circuit, and when the circuit has faults, the conduction of the silicon controlled rectifier Q4 is triggered to cause the tripping coil to trip.
2. The residual current operated circuit breaker with self-diagnostic test function according to claim 1, characterized in that: the self-diagnosis control circuit further comprises a diode VD7, a resistor R18, a resistor R24, a capacitor C6, a resistor R17, a capacitor C5, a resistor R22 and a diode VD6; the positive pole of diode VD7 is connected with external power supply's power N, diode VD 7's negative pole is connected with triode Q2's collecting electrode through resistance R24, triode Q2's projecting pole ground connection, triode Q2's base passes through resistance R17 and is connected with diagnostic chip U2's sixth pin, electric capacity C6 parallel connection is between triode Q2's base and triode Q2's projecting pole, resistance R18's one end is connected with external power supply's power L, the other end is connected with diagnostic chip U2's fourth pin, electric capacity C5 parallel connection is between diagnostic chip U2's second pin and diagnostic chip U2's third pin, diagnostic chip U2's second pin ground connection, diagnostic chip U2's third pin is connected with the step-down circuit, one end after resistance R22 and diode VD6 are parallelly connected is connected with diagnostic chip U2's first pin, the other end is connected with the tripping circuit.
3. The residual current operated circuit breaker with self-diagnostic test function according to claim 1, characterized in that: also comprises an alarm circuit.
4. The residual current operated circuit breaker with self-diagnostic test function according to claim 3, characterized in that: the alarm circuit alarms when the circuit fails; the alarm circuit comprises a light emitting diode D9 and a resistor R16, wherein one end of the light emitting diode D9 and the resistor R16 which are connected in series is connected with the self-diagnosis control circuit, and the other end of the light emitting diode D9 and the resistor R16 is grounded.
5. The residual current operated circuit breaker with self-diagnostic test function according to claim 3, characterized in that: the alarm circuit alarms when the circuit fails; the alarm circuit comprises a resistor R26, a loudspeaker LS, a capacitor C12, a resistor R27, a resistor R28, a resistor R29 and a resistor R30; one end of a resistor R26 is connected with the self-diagnosis control circuit, the other end of the resistor R26 is connected with the base electrode of a triode Q4, the emitter electrode of the triode Q4 is connected with a loudspeaker LS, one end of a capacitor C12 is connected with the collector electrode of the triode Q4, and the other end of the capacitor C is grounded; one end of the resistor R27 connected in parallel with the resistor R28 and one end of the resistor R29 connected in parallel with the resistor R30 are connected, the other end of the resistor R27 connected in parallel with the resistor R28 is connected with the collector of the triode Q4, and the other end of the resistor R29 connected in parallel with the resistor R30 is connected with the tripping coil KA of the tripping circuit.
6. The residual current operated circuit breaker with self-diagnostic test function according to claim 1, characterized in that: the external power supply is a two-phase power supply and comprises a power supply L phase and a power supply N phase, and the power supply circuit comprises a surge absorption circuit, a voltage reduction circuit and a rectifying circuit; the input end of the surge absorption circuit is connected with an external power supply to carry out surge absorption protection on the input power supply, the output end of the surge absorption circuit is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the voltage reduction circuit and the input end of the tripping circuit, and the output end of the voltage reduction circuit is connected with the input end of the leakage signal acquisition control circuit and the input end of the self-diagnosis control circuit.
7. The residual current operated circuit breaker with self-diagnostic test function according to claim 6, characterized in that: the surge absorption circuit comprises a piezoresistor RV1 and a piezoresistor RV2, and the piezoresistor RV1 and the piezoresistor RV2 are respectively connected in parallel between a power supply L phase and a power supply N phase; the rectifying circuit is a full-wave rectifying bridge, the rectifying bridge comprises a diode VD2, a diode VD3, a diode VD4 and a diode VD5, two opposite input ends of the rectifying bridge are respectively connected with a power supply L phase and a power supply N, the positive poles of the same polarity output ends of the rectifying bridge are grounded, and the negative poles of the same polarity output ends of the rectifying bridge are connected with the input ends of the voltage reduction circuit and the input ends of the tripping circuit.
8. The residual current operated circuit breaker with self-diagnostic test function according to claim 6, characterized in that: the voltage reducing circuit comprises a first voltage reducing circuit for reducing the voltage of the leakage signal acquisition control circuit and a second voltage reducing circuit for reducing the voltage of the self-diagnosis control circuit; the first voltage reduction circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a resistor R9, wherein the resistor R1 is connected with the resistor R2, the resistor R3 is connected with the resistor R4, the resistor R5 is connected with the resistor R6 in series and then is connected with the resistor R6 in parallel, one end of the parallel is connected with the output end of the rectifying circuit, the other end of the parallel is connected with one end of the parallel of the resistor R7, the resistor R8 and the resistor R9, and the other end of the parallel of the resistor R7, the resistor R8 and the resistor R9 is connected with the input end of the leakage signal acquisition control circuit; the second voltage reduction circuit comprises a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14 and a resistor R15, wherein the resistor R10, the resistor R11, the resistor R12, the resistor R13, the resistor R14 and the resistor R15 are respectively connected in series and then connected in parallel, one end of the parallel is connected with the output end of the rectifying circuit, and the other end of the parallel is connected with the input end of the self-diagnosis control circuit.
9. The residual current operated circuit breaker with self-diagnostic test function according to claim 1, characterized in that: the tripping circuit comprises a tripping coil KA, a diode VD1 and a silicon controlled rectifier Q3; one end of a tripping coil KA is connected with a power supply L of an external power supply, the other end of the tripping coil KA is connected with the positive electrode of a diode VD1, the negative electrode of the diode VD1 is connected with the anode of a silicon controlled rectifier Q3, the cathode of the silicon controlled rectifier Q3 is grounded, the control electrode of the silicon controlled rectifier Q3 is connected with a leakage signal acquisition control circuit, and the intermediate nodes of the diode VD1 and the silicon controlled rectifier Q3 are connected with a self-diagnosis control circuit;
At the negative half period of the power supply, the self-diagnosis control circuit simulates a leakage signal, sends the simulated leakage signal to the leakage signal acquisition control circuit to perform leakage detection, meanwhile, the first pin of the diagnosis chip U2 outputs a high level to supply power to the anode of the controllable silicon Q3, the first pin voltage of the diagnosis chip U2 is pulled down to pass through detection, if the first pin of the diagnosis chip U2 does not detect the low level, the diagnosis chip U2 outputs a signal to trigger the controllable silicon Q4 to be conducted, and the tripping coil KA is triggered.
10. The residual current operated circuit breaker with self-diagnostic test function according to claim 1, characterized in that: the leakage signal acquisition control circuit comprises a control chip U1, a bidirectional diode Q1, a debugging resistor R21, a resistor R19, a resistor R20, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C7; the power supply L phase and the power supply N phase of the external power supply pass through the zero-sequence transformer TA, and the debugging resistor R21 and the bidirectional diode Q1 are sequentially connected in parallel with the two ends of a secondary loop lead of the zero-sequence transformer TA; the two ends of the bidirectional diode Q1 are respectively connected with a capacitor C10 and a capacitor C11, the other ends of the capacitor C10 and the capacitor C11 are grounded, one ends of a resistor R19 and a resistor R20 are respectively connected with the capacitor C10 and the capacitor C11, the other ends of the resistor R20 are respectively connected with a second pin of the control chip U1 and a third pin of the control chip U1, a capacitor C4 is connected in parallel between the second pin of the control chip U1 and the third pin of the control chip U1, an eighth pin of the control chip U1 is connected with a voltage reducing circuit, one end of the capacitor C7 is connected with the eighth pin of the control chip U1, the other end of the capacitor C7 is grounded, the capacitor C2 is connected in parallel between the fourth pin of the control chip U1 and a fifth pin of the control chip U1, the capacitor C1 is connected in parallel between the fourth pin of the control chip U1 and a sixth pin of the control chip U1, the capacitor C3 is connected in parallel between the fourth pin of the control chip U1 and a seventh pin of the control chip U1, and the fourth pin of the control chip U1 is connected with the voltage reducing circuit.
11. The residual current operated circuit breaker with self-diagnostic test function according to claim 1, characterized in that: the leakage test circuit comprises a normally open test switch S2 and a test resistor R23, and the normally open test switch S2 and the test resistor R23 are connected in series between a power supply L phase and a power supply N phase of an external power supply.
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| CN201810033644.9A CN108199346B (en) | 2018-01-15 | 2018-01-15 | Residual current operated circuit breaker circuit with self-diagnosis and detection function |
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| CN108199346B true CN108199346B (en) | 2024-05-14 |
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