CN210380234U - Direct current power supply input overcurrent protection circuit - Google Patents
Direct current power supply input overcurrent protection circuit Download PDFInfo
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- CN210380234U CN210380234U CN201921494559.9U CN201921494559U CN210380234U CN 210380234 U CN210380234 U CN 210380234U CN 201921494559 U CN201921494559 U CN 201921494559U CN 210380234 U CN210380234 U CN 210380234U
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- power supply
- overcurrent protection
- direct current
- protection circuit
- supply input
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Abstract
The utility model relates to a control system's power protection, specific DC power supply input overcurrent protection circuit that says so. In practical application, the direct current power supply module is frequently short-circuited due to welding problems or damage of a load circuit and the like in the using process, and the power supply module and the electrical component are damaged.
Description
Technical Field
The utility model relates to a protection to control system power input end, specific overcurrent protection circuit of DC power supply input end that says so.
Background
The direct current stabilized voltage power supply module often has the phenomenon that a power supply module and other elements are damaged due to short circuit caused by short circuit or device damage and the like during welding of a load circuit in the using process. In order to avoid human error and reduce device damage as much as possible when the circuit fails, it is necessary to add a protection circuit to the power input terminal. If install the fuse additional at power input end and also can realize overcurrent protection, its reaction is more dull, can not regard as sensitive protection device, and the fuse burns out and also needs artificial change, designs a circuit that can enough realize sensitive protection effect for this reason, and the circuit that can automatic recovery operation again when troubleshooting is very necessary.
The circuit realizes the conduction and the disconnection of input voltage and current by controlling the quick conduction and the disconnection of the single-phase thyristor.
Disclosure of Invention
The utility model aims at designing an overcurrent protection circuit of DC power supply input, short circuit or reasons such as device damage lead to the short circuit when preventing load circuit welding, cause constant voltage power supply module and other load circuit's damage.
The utility model adopts the technical proposal that: the input voltage VDD is connected with the anode of a single-phase thyristor SCR, and the cathode series resistor R1 of the thyristor SCR is connected with the output voltage VCC; the input voltage VDD is connected with a series current limiting resistor R2 in series and is connected with a gate electrode of the thyristor SCR; the collector of the high-power NPN type triode Q is connected with an input voltage VDD, the base of the high-power NPN type triode Q is connected with the cathode of the thyristor SCR, and the emitter of the high-power NPN type triode Q is connected with an output voltage VCC.
The utility model discloses an actual effect is: the direct current voltage stabilizing module and the load circuit are protected from being damaged by overlarge current.
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a circuit diagram of a power module input overcurrent protection circuit.
Detailed Description
As shown in fig. 1, when the input voltage VDD is input in the protection circuit, the anode voltage Ua of the single-phase thyristor is greater than the cathode voltage Uk and greater than 0.7V, the gate voltage Ug is greater than the cathode voltage Uk, the thyristor is turned on, and the voltage VCC is output through the resistor R1, when the power consumption exceeds the predetermined allowable maximum value, that is, the voltage of the resistor R1 is greater than 0.7V, the base voltage of the triode Q is greater than 0.7V, the emitter junction is forward biased, the collector and the emitter of the triode Q are turned on, and at this time, the voltage difference between the anode voltage Ua and the cathode voltage Uk of the single-phase thyristor is less than 0.7V, the single-phase thyristor is.
Claims (1)
1. The utility model provides a direct current power supply input overcurrent protection circuit which characterized in that: the input Voltage (VDD) is connected with the anode of a single-phase thyristor (SCR), and the cathode series resistor (R1) of the thyristor (SCR) is connected with the output Voltage (VCC); the input Voltage (VDD) is connected with a gate electrode of a thyristor (SCR) in series with a current limiting resistor (R2); the collector of the high-power NPN type triode (Q) is connected with an input Voltage (VDD), the base of the high-power NPN type triode (Q) is connected with the cathode of the thyristor (SCR), and the emitter of the high-power NPN type triode (Q) is connected with an output Voltage (VCC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921494559.9U CN210380234U (en) | 2019-09-10 | 2019-09-10 | Direct current power supply input overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921494559.9U CN210380234U (en) | 2019-09-10 | 2019-09-10 | Direct current power supply input overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210380234U true CN210380234U (en) | 2020-04-21 |
Family
ID=70254538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921494559.9U Active CN210380234U (en) | 2019-09-10 | 2019-09-10 | Direct current power supply input overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210380234U (en) |
-
2019
- 2019-09-10 CN CN201921494559.9U patent/CN210380234U/en active Active
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| GR01 | Patent grant |