CN217508261U - Overcurrent protection circuit - Google Patents
Overcurrent protection circuit Download PDFInfo
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- CN217508261U CN217508261U CN202122933946.1U CN202122933946U CN217508261U CN 217508261 U CN217508261 U CN 217508261U CN 202122933946 U CN202122933946 U CN 202122933946U CN 217508261 U CN217508261 U CN 217508261U
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Abstract
The utility model discloses an overcurrent protection circuit, it includes opto-coupler, current detection resistance and current-limiting resistor, and the direct current input negative terminal is connected with the negative input end of opto-coupler, and is connected with the direct current output negative terminal through current detection resistance, and the positive input end of opto-coupler is connected with the direct current output negative terminal through current-limiting resistor, and the positive terminal of direct current input is connected with the direct current output positive terminal, and the positive output end, the negative output end of opto-coupler are connected with control signal's positive terminal, negative terminal respectively. The utility model discloses components and parts use less, use in a flexible way, optimize and produce property ability, in the circuit that various needs controlled through the opto-coupler, have extensive application prospect.
Description
Technical Field
The utility model belongs to the technical field of overcurrent protection technique and specifically relates to an overcurrent protection circuit is related to.
Background
When the output voltage of the power supply exceeds the rated load or is short-circuited, the power supply is damaged, so that the power supply cannot work normally. Therefore, when designing a circuit of a power supply, the power supply is usually designed with an overcurrent protection circuit. When the current in the circuit is overlarge and exceeds the rated load, the overcurrent protection circuit can automatically disconnect the power supply equipment, so that the internal devices of the power supply are protected from being damaged. Currently, the over-current protection circuits are complex and require additional auxiliary sources to provide signals and references.
Disclosure of Invention
In order to solve the above problem, the utility model aims at providing a simple structure, overcurrent protection circuit that the practicality is strong, it need not plus the power supply, is applicable to all kinds of circuits that have the overcurrent protection demand.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides an overcurrent protection circuit, it includes opto-coupler V1, current detection resistance R1 and current-limiting resistance R2, direct current input negative terminal is connected with opto-coupler V1's negative input end, and be connected with the direct current output negative terminal through current detection resistance R1, opto-coupler V1's positive input end is connected with the direct current output negative terminal through current-limiting resistance R2, the positive terminal of direct current input is connected with the positive terminal of direct current output, opto-coupler V1's positive output, the negative output respectively with control signal's positive terminal, the negative terminal is connected.
Further, the model of the above-mentioned optical coupler V1 is TLP 127.
Due to the adoption of the technical scheme, the utility model has the advantages that:
the overcurrent protection circuit is simple in structure, reasonable in design, less in component use, low in manufacturing cost, flexible to use, capable of optimizing product performance, and wide in application prospect in various circuits needing to be controlled through the optocoupler.
Drawings
Fig. 1 is a schematic diagram of the overcurrent protection circuit of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
As shown IN fig. 1, the overcurrent protection circuit includes an optical coupler V1, a current detection resistor R1, and a current limiting resistor R2, wherein a dc input negative terminal (IN-) of a dc source is connected to a negative input terminal of the optical coupler V1 and is connected to a dc output negative terminal (OUT-) through the current detection resistor R1, a positive input terminal of the optical coupler V1 is connected to the dc output negative terminal (OUT-) through a current limiting resistor R2, a dc input positive terminal (IN +) is connected to a dc output positive terminal (OUT +), a positive output terminal and a negative output terminal of the optical coupler V1 are respectively connected to a positive terminal (KZ +), and a negative terminal (KZ-) of a control signal, and are used for controlling a load operating state connected to an output terminal of the optical coupler V1, for example, controlling on/off of a switch.
The model of the optical coupler V1 adopts TLP 127.
Preferably, the current detection resistor R1 is MGN12HR010FT, and has a resistance of 0.01 Ω; the current limiting resistor R2 is RMK3216KB4991FM with resistance of 499 Ω.
The utility model discloses overcurrent protection circuit's theory of operation does: the current of the direct current input negative terminal is sampled by the current detection resistor R1 and then converted into voltage to control the on and off of the optocoupler V1, and the output end of the optocoupler V1 is utilized to control whether a power supply works or not, so that the overcurrent protection function of the circuit is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. An overcurrent protection circuit is characterized in that: it includes opto-coupler V1, current detection resistance R1 and current-limiting resistance R2, direct current input negative terminal is connected with opto-coupler V1's negative input end, and be connected with the direct current output negative terminal through current detection resistance R1, opto-coupler V1's positive input end is connected with the direct current output negative terminal through current-limiting resistance R2, the positive terminal of direct current input is connected with the positive terminal of direct current output, opto-coupler V1's positive output end, the negative output end respectively with control signal's positive terminal, the negative terminal is connected.
2. The overcurrent protection circuit of claim 1, wherein: the model of the optical coupler V1 is TLP 127.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122933946.1U CN217508261U (en) | 2021-11-26 | 2021-11-26 | Overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122933946.1U CN217508261U (en) | 2021-11-26 | 2021-11-26 | Overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217508261U true CN217508261U (en) | 2022-09-27 |
Family
ID=83336648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122933946.1U Active CN217508261U (en) | 2021-11-26 | 2021-11-26 | Overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217508261U (en) |
-
2021
- 2021-11-26 CN CN202122933946.1U patent/CN217508261U/en active Active
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