CN211266447U - Self-recovery overcurrent protection device - Google Patents
Self-recovery overcurrent protection device Download PDFInfo
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- CN211266447U CN211266447U CN201922468012.8U CN201922468012U CN211266447U CN 211266447 U CN211266447 U CN 211266447U CN 201922468012 U CN201922468012 U CN 201922468012U CN 211266447 U CN211266447 U CN 211266447U
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Abstract
The utility model discloses a self-recovery overcurrent protection device, which comprises a power circuit, a rectification conversion circuit, a driver, a comparator, an electromagnet coil, a Hall switch, a relay and a current collector; the contact side of the relay and the input end of the current collector are connected in series in a load main loop, the output end of the current collector is connected with the input end of the rectification conversion circuit, the output end of the rectification conversion circuit is connected with the non-inverting input end of the comparator, the inverting input end of the comparator is connected with a reference voltage, and the output end of the comparator is connected with the control end of the driver; the input end of the power circuit is connected with the power supply end of the electric equipment in parallel, the output end of the power circuit, the main loop of the driver and the electromagnet coil are connected in series, the output end of the power circuit, the relay coil side and the Hall switch are connected in series, the Hall switch is close to the electromagnet coil, and the output end of the power circuit is connected with the power supply end of the comparator. The utility model discloses cut off load major loop when transshipping, the automatic recovery load major loop power supply after the overload disappears.
Description
Technical Field
The utility model relates to a self-resuming overcurrent protection device belongs to the overcurrent protection field.
Background
In the use process of the electrical equipment, due to overload reasons, the phenomena of fuse blowing and air switch tripping often occur, in order to overcome the accidents, a power supply needs to be cut off instantly during overload, and the power supply is automatically recovered after the accidents disappear, but no response device exists at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a self-resuming overcurrent protection device has solved the problem that reveals in the background art.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
a self-recovery over-current protection device comprises a power circuit, a rectification conversion circuit, a driver, a comparator, an electromagnet coil, a Hall switch, a relay and a current collector;
the contact side of the relay and the input end of the current collector are connected in series in a load main loop, the output end of the current collector is connected with the input end of the rectification conversion circuit, the output end of the rectification conversion circuit is connected with the non-inverting input end of the comparator, the inverting input end of the comparator is connected with a reference voltage, and the output end of the comparator is connected with the control end of the driver;
the input end of the power circuit is connected with the power supply end of the electric equipment in parallel, the output end of the power circuit, the main loop of the driver and the electromagnet coil are connected in series, the output end of the power circuit, the relay coil side and the Hall switch are connected in series, the Hall switch is close to the electromagnet coil, and the output end of the power circuit is connected with the power supply end of the comparator.
The power circuit comprises a step-down transformer, a rectifier bridge, a capacitor filter and a voltage stabilizing circuit which are sequentially connected, wherein the input end of the step-down transformer is the input end of the power circuit, and the output end of the voltage stabilizing circuit is the output end of the power circuit.
The current collector comprises a current transformer.
The rectification conversion circuit comprises a rectifier and a conversion resistor, the input end of the rectifier is connected with the current collector, the output end of the rectifier is connected with the comparator, and the conversion resistor is connected in parallel with the output end of the rectifier bridge.
The driver is a triode, the base electrode of the triode is connected with the comparator, the collector electrode of the triode is grounded, and the emitting electrode of the triode is connected with the power circuit through the electromagnet coil.
The comparator is an LM393 comparator.
The relay adopts a direct current relay.
The Hall switch is a Hall switch with normally open output.
The electromagnet coil adopts a linear ferrite core.
The utility model discloses the beneficial effect who reaches: the utility model discloses utilize the electromagnetic induction principle, through electromagnet coil control hall switch break-make to control relay's switch, control load major loop break-make when realizing transshipping, cuts off load major loop, and the overload disappears the back automatic recovery load major loop power supply.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a power supply circuit diagram.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a self-recovery overcurrent protection device includes a power circuit, a rectification conversion circuit, a driver, a comparator, an electromagnet coil, a hall switch, a relay, and a current collector.
The contact side of the relay and the input end of the current collector are connected in series in a load main loop, the output end of the current collector is connected with the input end of the rectification conversion circuit, the output end of the rectification conversion circuit is connected with the non-inverting input end of the comparator, the inverting input end of the comparator is connected with a reference voltage, and the output end of the comparator is connected with the control end of the driver; the input end of the power circuit is connected with the power supply end of the electric equipment in parallel to obtain electric energy, the output end of the power circuit, the main loop of the driver and the electromagnet coil are connected in series, the output end of the power circuit, the relay coil side and the Hall switch are connected in series, the Hall switch is close to the electromagnet coil, and the output end of the power circuit is connected with the power end of the comparator.
As shown in fig. 2, the power circuit is a common structure, and includes a 220VAC/9VAC step-down transformer, a rectifier bridge, a capacitor filter and a 5V voltage stabilizing circuit, which are connected in sequence, wherein an input terminal of the step-down transformer is an input terminal of the power circuit, and an output terminal of the voltage stabilizing circuit is an output terminal of the power circuit; the 220VAC/9VAC step-down transformer can adopt RC resistance-capacitance step-down, the capacitor adopts withstand voltage 400VAC, the capacity is 10 microfarad nonpolar capacitor, and the resistance is 680k ohm.
The current collector comprises a current transformer, the transformation ratio is determined according to actual conditions and is generally 250A/0.1A, and the current collector is used for sampling the alternating current in the load main loop.
The rectification conversion circuit comprises a rectifier and a 100 ohm 2W conversion resistor, the input end of the rectifier is connected with the current collector, the output end of the rectifier is connected with the comparator, and the conversion resistor is connected in parallel with the output end of the rectifier bridge; the rectifier rectifies the sampled alternating current into direct current, and the direct current is converted into voltage under the action of the conversion resistor.
The comparator adopts an LM393 comparator, and the reference voltage of the comparator is provided by a voltage stabilizing diode.
The driver is a 9013 triode, the base electrode of the triode is connected with the comparator, the collector electrode of the triode is grounded, and the emitter electrode of the triode is connected with the power circuit through the electromagnet coil; when the comparator outputs a high potential, the driver main circuit is energized, and the electromagnet coil is energized.
The electromagnet coil adopts a linear ferrite core, 50 circles of enameled wires are wound outside the electromagnet coil, and the through-current capacity reaches 1A.
The Hall switch adopts a Hall switch with normally open output, and is switched on when the electromagnet coil is electrified, so that the coil side of the relay is electrified.
The relay adopts a 5VDC direct current relay, the coil side of the relay is electrified, the normally closed contact of the relay is disconnected, and the load loses power.
The principle of the device is as follows: when overcurrent occurs, the comparator outputs high potential (the output voltage of the rectification conversion circuit is greater than the reference voltage), the electromagnet coil is electrified, the Hall switch is switched on, the relay coil is electrified, the normally closed contact of the relay is switched off, and the load loses power; when the overcurrent disappears, the comparator outputs a low potential (the output voltage of the rectification conversion circuit is less than the reference voltage), the electromagnet coil is not electrified, the Hall switch is disconnected, the relay coil side is not electrified, the normally closed contact of the relay is credited with conduction, and the load is electrified.
The utility model discloses utilize the electromagnetic induction principle, through electromagnet coil control hall switch break-make to control relay's switch, control load major loop break-make when realizing transshipping, cuts off load major loop, and the overload disappears the back automatic recovery load major loop power supply.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (9)
1. The utility model provides a self-resuming overcurrent protection device which characterized in that: the device comprises a power supply circuit, a rectification conversion circuit, a driver, a comparator, an electromagnet coil, a Hall switch, a relay and a current collector;
the contact side of the relay and the input end of the current collector are connected in series in a load main loop, the output end of the current collector is connected with the input end of the rectification conversion circuit, the output end of the rectification conversion circuit is connected with the non-inverting input end of the comparator, the inverting input end of the comparator is connected with a reference voltage, and the output end of the comparator is connected with the control end of the driver;
the input end of the power circuit is connected with the power supply end of the electric equipment in parallel, the output end of the power circuit, the main loop of the driver and the electromagnet coil are connected in series, the output end of the power circuit, the relay coil side and the Hall switch are connected in series, the Hall switch is close to the electromagnet coil, and the output end of the power circuit is connected with the power supply end of the comparator.
2. A self-healing over-current protection device according to claim 1, wherein: the power circuit comprises a step-down transformer, a rectifier bridge, a capacitor filter and a voltage stabilizing circuit which are sequentially connected, wherein the input end of the step-down transformer is the input end of the power circuit, and the output end of the voltage stabilizing circuit is the output end of the power circuit.
3. A self-healing over-current protection device according to claim 1, wherein: the current collector comprises a current transformer.
4. A self-healing over-current protection device according to claim 1, wherein: the rectification conversion circuit comprises a rectifier and a conversion resistor, the input end of the rectifier is connected with the current collector, the output end of the rectifier is connected with the comparator, and the conversion resistor is connected in parallel with the output end of the rectifier bridge.
5. A self-healing over-current protection device according to claim 1, wherein: the driver is a triode, the base electrode of the triode is connected with the comparator, the collector electrode of the triode is grounded, and the emitting electrode of the triode is connected with the power circuit through the electromagnet coil.
6. A self-healing over-current protection device according to claim 1, wherein: the comparator is an LM393 comparator.
7. A self-healing over-current protection device according to claim 1, wherein: the relay adopts a direct current relay.
8. A self-healing over-current protection device according to claim 1, wherein: the Hall switch is a Hall switch with normally open output.
9. A self-healing over-current protection device according to claim 1, wherein: the electromagnet coil adopts a linear ferrite core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922468012.8U CN211266447U (en) | 2019-12-31 | 2019-12-31 | Self-recovery overcurrent protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922468012.8U CN211266447U (en) | 2019-12-31 | 2019-12-31 | Self-recovery overcurrent protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211266447U true CN211266447U (en) | 2020-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922468012.8U Active CN211266447U (en) | 2019-12-31 | 2019-12-31 | Self-recovery overcurrent protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211266447U (en) |
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2019
- 2019-12-31 CN CN201922468012.8U patent/CN211266447U/en active Active
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