CN211209270U - Power supply system abnormity protection circuit - Google Patents
Power supply system abnormity protection circuit Download PDFInfo
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- CN211209270U CN211209270U CN201921890508.8U CN201921890508U CN211209270U CN 211209270 U CN211209270 U CN 211209270U CN 201921890508 U CN201921890508 U CN 201921890508U CN 211209270 U CN211209270 U CN 211209270U
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Abstract
The utility model relates to a power supply system abnormal protection circuit, which comprises an output relay protection circuit connected between a power supply system and load equipment, wherein the output relay protection circuit comprises a photoelectric coupling circuit, a control circuit and a switch circuit; the input end of the photoelectric coupling circuit is connected with the control signal, the output end of the photoelectric coupling circuit is connected with the input end of the control circuit, the control end of the control circuit is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the load circuit, and the power supply end of the switch circuit is connected with the DC output end of the power supply system. Power supply system abnormal protection circuit, circuit low cost, dependable performance and accuracy are high, when power supply system breaks down unusually, power supply system turn-offs output, breaks off the back level load device simultaneously.
Description
Technical Field
The utility model relates to a switching power supply circuit technical field, concretely relates to electrical power generating system exception protection circuit.
Background
As the application of the switching power supply becomes wider, the requirement on the perfect control protection function is higher and higher. In particular, the protection requirements on the power supply system are more strict, and in the power supply system, the subsystems are independent from each other. If one subsystem has a fault, the subsequent load equipment connected with the subsystem needs to be disconnected, and the subsystem and the subsequent load equipment are completely physically isolated. In order to be completely disconnected from the subsequent equipment, when a power supply system has an abnormal fault, the subsequent load equipment is often disconnected in the power supply protection process, so that the power supply and the load components in the circuit are protected in time, and the accident loss is reduced.
There are various methods for realizing the abnormal protection of the power supply system, however, the existing power supply system only switches off the rear-stage load when the protection is performed, and can automatically switch on the rear-stage load when the protection is not released. After the inspection and maintenance are finished, the loop needs to be closed independently, and the disconnecting switch is often far away from the load, so that the burden of maintenance personnel is increased, and the cost of a power supply system is increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electrical power generating system abnormal protection circuit, this circuit low cost, dependable performance and accuracy are high, and when electrical power generating system broke down unusually, electrical power generating system turned off the output, breaks off the back level load device simultaneously.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a power supply system abnormity protection circuit comprises an output relay protection circuit connected between a power supply system and load equipment, wherein the output relay protection circuit comprises a photoelectric coupling circuit, a control circuit and a switch circuit; the input end of the photoelectric coupling circuit is connected with the control signal, the output end of the photoelectric coupling circuit is connected with the input end of the control circuit, the control end of the control circuit is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the load circuit, and the power supply end of the switch circuit is connected with the DC output end of the power supply system.
As a further improvement of the above technical solution:
the photoelectric coupling circuit comprises a photoelectric coupler U1, a resistor R1, a resistor R2 and a capacitor C3, wherein the input end of the photoelectric coupler U1 is connected with a control signal, the resistor R2 and the capacitor C3 are connected in parallel to the input end of the photoelectric coupler U1, the resistor R1 and the resistor R2 are respectively connected in series to the anode end and the cathode end of a light emitting diode of the photoelectric coupler, and the output end of the photoelectric coupler U1 is connected with the input end of the control circuit.
The control circuit comprises a triode Q1, a resistor R5, a resistor R6 and a capacitor C4, wherein the base electrode of the triode Q1 is connected with the output end of the photoelectric coupling circuit through a resistor R5, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with the output end of the switching circuit, one end of the resistor R6 is connected with the base electrode of the triode Q1, the other end of the resistor R6 is grounded, and the capacitor C4 is connected with the two ends of the resistor R6 in parallel.
The switch circuit comprises a diode D1, a diode D3, a relay J1 and a relay J2, a relay control signal output by the relay J1 is connected with the input end of load equipment, a switch movable contact of the relay J1 is grounded, a switch static contact of the relay J1 is connected with an anode of the diode D1, and a cathode of the diode D1 is connected with a movable contact of the relay J2; the static contact of the relay J2 is connected with the DC output end of the power supply system, the two ends of the coil of the relay J2 are connected with the capacitor C2 in parallel, the diode D3 is connected with the two ends of the coil of the relay J2 in parallel, the cathode of the diode D3 is connected with the power supply, and the anode of the diode D3 is connected with the control end of the control circuit.
The diode D1 is a bidirectional diode, one end of the anode of the bidirectional diode D1 is grounded, the anode of the other end of the bidirectional diode D1 is connected with the fixed contact of the relay J1, and the cathode of the diode D1 is connected with the movable contact of the relay J2.
The relay J1 and the relay J2 both adopt electromagnetic relays.
According to the above technical scheme, electrical power generating system abnormal protection circuit, the principle is simple, low cost, dependable performance and accuracy are high, when electrical power generating system breaks down unusually, electrical power generating system turn-offs output, breaks off rear load equipment simultaneously. And after the abnormal protection is removed, detecting the abnormal signal state of the power supply system through the single chip microcomputer, and judging whether a starting signal is given or not, so that the load equipment device is disconnected when the abnormal protection is realized. And when the system has no abnormal fault, automatically closing the load device. The purpose of automatic circuit breaker and closing device is realized.
Drawings
Fig. 1 is a circuit diagram of the present invention;
fig. 2 is a block diagram of an application circuit of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the power supply system abnormality protection circuit of the present embodiment includes an output relay protection circuit connected between a power supply system and a load device, where the output relay protection circuit includes a photocoupling circuit, a control circuit, and a switch circuit; the input end of the photoelectric coupling circuit is connected with the control signal, the output end of the photoelectric coupling circuit is connected with the input end of the control circuit, the control end of the control circuit is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the load circuit, and the power supply end of the switch circuit is connected with the DC output end of the power supply system.
As shown in fig. 2, in this embodiment, the photocoupler circuit is composed of a photocoupler U1, a resistor R1, a resistor R2 and a capacitor C3, an input terminal of the photocoupler U1 is connected to the single chip microcomputer control signal, the resistor R2 and the capacitor C3 are both connected in parallel to an input terminal of the photocoupler U1, the resistor R1 and the resistor R2 are respectively connected in series to an anode terminal and a cathode terminal of a light emitting diode of the photocoupler U1, and an output terminal of the photocoupler U1 is connected to an input terminal of the control circuit.
The control circuit comprises a triode Q1, a resistor R5, a resistor R6 and a capacitor C4, wherein the base electrode of the triode Q1 is connected with the output end of a photoelectric coupler U1 through a resistor R5, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with the output end of the switching circuit, one end of a resistor R6 is connected with the base electrode of the triode Q1, the other end of the resistor R6 is grounded, and the capacitor C4 is connected to two ends of the resistor R6 in parallel.
The switch circuit is composed of a bidirectional diode D1, a diode D3, an electromagnetic relay J1 and an electromagnetic relay J2, wherein one end of the anode of the bidirectional diode D1 is grounded, the anode of the other end of the bidirectional diode D1 is connected with a fixed contact of the relay J1, and the cathode of the diode D1 is connected with a movable contact of the relay J2. A relay control signal output by the electromagnetic relay J1 is connected with the input end of the load device 3, and a switch movable contact of the relay J1 is grounded; the static contact of the relay J2 is connected with the DC output end of the power supply system 1, the two ends of the coil of the relay J2 are connected with a capacitor C2 in parallel, the diode D3 is connected with the two ends of the coil of the relay J2 in parallel, the cathode of the diode D3 is connected with a power supply, and the anode of the diode D3 is connected with the collector of the triode Q1.
The working principle of the circuit is as follows:
when the power supply system is in abnormal protection, a single chip microcomputer in the power supply system 1 detects abnormal fault information and sends an abnormal fault signal (FAU L T +, FAU L T-), the abnormal fault signal (FAU L T +, FAU L T-) is in a high level, FAU L T +, FAU L T-pass through a resistor R1, a resistor R3 and the primary sides 1 and 2 of a photoelectric coupler U1 to enable the primary side of the photoelectric coupler U1 to be conducted, a resistor R2 and a capacitor C3 to be connected in parallel to the primary side of the photoelectric coupler to form an RC signal filter circuit, so that the secondary side of the photoelectric coupler U1 is also conducted, the current in the circuit flows to 28V and flows to the ground through the resistor R4, the base of the NPN Q1 is in a low level to enable the NPN triode Q1 to be changed from a conducting state to a cut-off state, the coil voltage of a relay J2 is applied, the movable contact of the relay J2 is disconnected, the 28V voltage is disconnected by the movable contact of the movable contact relay J2, the.
When the power supply system works normally, the single chip microcomputer detects normal state information, an abnormal fault signal (FAU L T +, FAU L T-) goes out of a low level and indicates that the power supply system is normal, the primary side of the photoelectric coupler U1 is not conducted, and therefore the secondary side is not conducted, at the moment, the movable contact of the output control relay J1 is closed, GND and RE L AY4 are equipotential, the current flowing direction 28V in the circuit is subjected to voltage division through resistors R4, R5 and R6, so that an NPN triode Q1 is conducted, at the moment, 28V voltage is generated at two ends of a coil of the relay J2, the movable contact of the relay J2 is closed, at the moment, the current flowing direction 28V in the circuit is subjected to diode D1, the movable contact of the relay J2 is connected to the coil end RE L AY4+, at the moment, the coil end voltage of the output relay is 28V, the.
The above-mentioned embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (6)
1. An abnormal protection circuit of a power supply system is characterized in that: the control circuit comprises an output relay protection circuit connected between a power supply system and load equipment, wherein the output relay protection circuit comprises a photoelectric coupling circuit, a control circuit and a switch circuit; the input end of the photoelectric coupling circuit is connected with the control signal, the output end of the photoelectric coupling circuit is connected with the input end of the control circuit, the control end of the control circuit is connected with the input end of the switch circuit, the output end of the switch circuit is connected with the load circuit, and the power supply end of the switch circuit is connected with the DC output end of the power supply system.
2. The power supply system abnormality protection circuit according to claim 1, characterized in that: the photoelectric coupling circuit comprises a photoelectric coupler U1, a resistor R1, a resistor R2 and a capacitor C3, the input end of the photoelectric coupler U1 is connected with a control signal, the resistor R2 and the capacitor C3 are connected in parallel to the input end of the photoelectric coupler U1, the resistor R1 and the resistor R2 are respectively connected in series to the anode end and the cathode end of a light emitting diode of the photoelectric coupler U1, and the output end of the photoelectric coupler U1 is connected with the input end of the control circuit.
3. The power supply system abnormality protection circuit according to claim 1, characterized in that: the control circuit comprises a triode Q1, a resistor R5, a resistor R6 and a capacitor C4, wherein the base electrode of the triode Q1 is connected with the output end of the photoelectric coupling circuit through a resistor R5, the emitter electrode of the triode Q1 is grounded, the collector electrode of the triode Q1 is connected with the output end of the switching circuit, one end of the resistor R6 is connected with the base electrode of the triode Q1, the other end of the resistor R6 is grounded, and the capacitor C4 is connected with the two ends of the resistor R6 in parallel.
4. The power supply system abnormality protection circuit according to claim 1, characterized in that: the switch circuit comprises a diode D1, a diode D3, a relay J1 and a relay J2, a relay control signal output by the relay J1 is connected with the input end of load equipment, a switch movable contact of the relay J1 is grounded, a switch static contact of the relay J1 is connected with an anode of the diode D1, and a cathode of the diode D1 is connected with a movable contact of the relay J2; the static contact of the relay J2 is connected with the DC output end of the power supply system, the two ends of the coil of the relay J2 are connected with the capacitor C2 in parallel, the diode D3 is connected with the two ends of the coil of the relay J2 in parallel, the cathode of the diode D3 is connected with the power supply, and the anode of the diode D3 is connected with the control end of the control circuit.
5. The power supply system abnormality protection circuit according to claim 4, characterized in that: the diode D1 is a bidirectional diode, one end of the anode of the bidirectional diode D1 is grounded, the anode of the other end of the bidirectional diode D1 is connected with the fixed contact of the relay J1, and the cathode of the diode D1 is connected with the movable contact of the relay J2.
6. The power supply system abnormality protection circuit according to claim 4, characterized in that: the relay J1 and the relay J2 both adopt electromagnetic relays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921890508.8U CN211209270U (en) | 2019-11-05 | 2019-11-05 | Power supply system abnormity protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921890508.8U CN211209270U (en) | 2019-11-05 | 2019-11-05 | Power supply system abnormity protection circuit |
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| CN211209270U true CN211209270U (en) | 2020-08-07 |
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| CN201921890508.8U Active CN211209270U (en) | 2019-11-05 | 2019-11-05 | Power supply system abnormity protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112139065A (en) * | 2020-09-16 | 2020-12-29 | 华兰生物工程重庆有限公司 | Sorting system and sorting method for raw material plasma |
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2019
- 2019-11-05 CN CN201921890508.8U patent/CN211209270U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112139065A (en) * | 2020-09-16 | 2020-12-29 | 华兰生物工程重庆有限公司 | Sorting system and sorting method for raw material plasma |
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