CN202930899U - Direct current overcurrent protection device - Google Patents
Direct current overcurrent protection device Download PDFInfo
- Publication number
- CN202930899U CN202930899U CN 201220663530 CN201220663530U CN202930899U CN 202930899 U CN202930899 U CN 202930899U CN 201220663530 CN201220663530 CN 201220663530 CN 201220663530 U CN201220663530 U CN 201220663530U CN 202930899 U CN202930899 U CN 202930899U
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- Prior art keywords
- circuit
- power supply
- overcurrent
- direct current
- protection device
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- Expired - Fee Related
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Abstract
The utility model provides a direct current (DC) overcurrent protection device, which comprises a 15-85V DC power supply, a DC power supply filter circuit, a unidirectional thyristor trigger circuit and a control circuit thereof, an overcurrent identification circuit, and a DC output status indicator circuit. As a common fuse is slow to response to overcurrent, it cannot be used as a sensitive protection device. In addition, once a common fuse is fused broken, the fusing is not necessarily found timely. According to the utility model, a circuit is used to replace a fuse and monitor the working status of the fuse. Once overload and overcurrent happen to the DC power supply, the circuit can help users or maintenance personnel to rapidly and visually find faults through status indication. The circuit of the DC overcurrent protection device provided by the utility model has characteristics of rapid cutout of overcurrent, rapid recovery speed, wide voltage range of the DC power supply and the like, and can be widely applied as an overcurrent protection device in a DC circuit.
Description
Technical field
The utility model belongs to electronics and power technique fields, relates to a kind of direct current overcurrent protective device.
Background technology
Because of the general insurance silk that is used for overcurrent protection use simple, cheap, the scope of application is wide is widely used always.But the reaction of its overcurrent of general insurance silk is more blunt, can not be as the sensitivity protection device, and also the general insurance silk is in case fuse, and differing in time is found surely.If can replace and monitor the fuse operating state with a circuit, in case during DC power supply generation overload flow, it can be indicated by state and help user or maintenance personal to find quickly and intuitively fault.Therefore, a kind of DC power supply overcurrent fuse of research making just seems particularly necessary.
Direct current overcurrent protective device described in the utility model has the characteristics such as overcurrent quick flow-breaking, resume speed is fast, the DC power supply voltage range is wide, can be widely used in doing in DC circuit overcurrent protective device.
Below describe direct current overcurrent protective device described in the utility model related technology contents in manufacturing process in detail.
The utility model content
Goal of the invention and beneficial effect: the reaction of its overcurrent of general insurance silk is more blunt, can not be as the sensitivity protection device, and also the general insurance silk is in case fuse, and differing in time is found surely.If can replace and monitor the fuse operating state with a circuit, in case during DC power supply generation overload flow, it can be indicated by state and help user or maintenance personal to find quickly and intuitively fault.The circuit of direct current overcurrent protective device described in the utility model has the characteristics such as overcurrent quick flow-breaking, resume speed is fast, the DC power supply voltage range is wide, can be widely used in doing in DC circuit overcurrent protective device.
The operation principle of circuit: when the moment that key switch AN connects, unidirectional thyristor SCR conducting, DC circuit is conducting also.When the loaded work piece electric current increases to over permissible value, voltage on sample resistance R2 is during greater than 0.75V, NPN transistor VT1 conducting, this moment NPN transistor VT1 collector electrode and base stage between voltage drop to the voltage of keeping lower than unidirectional thyristor SCR conducting, unidirectional thyristor SCR is turned off, cut off simultaneously 15～85V DC power supply, direct current output state indicator light LED extinguishes immediately.Resistance R 3 is dropping resistors, is used for providing the unidirectional thyristor SCR trigger voltage of conducting.
Technical characterictic: the direct current overcurrent protective device, it comprises 15～85V DC power supply, DC power supply filter circuit, unidirectional thyristor circuits for triggering and control circuit thereof, overcurrent identification circuit, direct current output state indicating circuit, it is characterized in that:
Unidirectional thyristor circuits for triggering and control circuit thereof: it is comprised of unidirectional thyristor SCR, key switch AN and dropping resistor R3, the anode of unidirectional thyristor SCR connects the anodal VCC of 15～85V DC power supply and the end of key switch AN, the other end of key switch AN is by the control utmost point of dropping resistor R3 order to thyristor SCR, and the negative electrode of unidirectional thyristor SCR is taken over the stream identification circuit;
The overcurrent identification circuit: it is comprised of NPN transistor VT1, sample resistance R2, the base stage order of NPN transistor VT1 is to the negative electrode of thyristor SCR and the end of sample resistance R2, the emitter of NPN transistor VT1 accesses the other end of sample resistance R 2 and the anodal VCC1 of DC output end, and the collector electrode of NPN transistor VT1 meets the anodal VCC of 15～85V DC power supply.
Direct current output state indicating circuit: the positive pole of LED meets the anodal VCC1 of 12～80V DC output end by dropping resistor R1, the negative pole connection circuit ground GND of LED, and the negative pole of 15～85V DC power supply is connected with circuit ground GND.
Description of drawings
Accompanying drawing 1 is the circuit working schematic diagram of a kind of direct current overcurrent protective device of providing of embodiment.
Embodiment
Specification requirement according to the components and parts of the circuit working schematic diagram of direct current overcurrent protective device shown in accompanying drawing 1 and description of drawings and the following stated is implemented, and can realize the utility model.
Components and parts technical parameter and selection
When DC power supply voltage≤100V, NPN transistor VT1 can select 3DD15;
It is any model of 5A/200V that unidirectional thyristor SCR can select technical parameter;
The resistance of dropping resistor R1 should just be determined according to the voltage of DC power supply used, the span 1K Ω of dropping resistor R1～8.2K Ω, and DC power supply voltage is higher, and the value of dropping resistor R1 is larger;
Resistance R 2 is wire-wound resistor, and the resistance of resistance R 2 allows current value to determine according to DC power supply, that is: R2=0.75V/I(I is that DC power supply allows current value), the resistance of resistance R 2 is 0.35 Ω approximately, and its power is 5W;
R3 is dropping resistor, and the resistance of resistance R 3 is 1.2K Ω approximately;
LED is red light emitting diodes, is used to indicate direct current output services state;
15～85V DC power supply can be used non-constant voltage dc source, maximum output current 〉=2A.
Circuit production main points and circuit debugging
In the circuit of direct current overcurrent protective device, as long as the electronic devices and components performance of selecting is intact, and the components and parts annexation in accompanying drawing is welded to specifications, physical connection line and welding quality through carefully check correct after, circuit does not need debugging to work substantially;
Experiment power supply can use the non-constant voltage dc source of 15～85V, output current 〉=3A, and according to different output voltages, DC output end is refuted and connect corresponding load, when load current just reaches 2A, examines the variation of this device operating state;
Attention: the overload current of direct current overcurrent protective device is 2A, and when the loaded work piece electric current reached 2A, electric overcurrent protective device will move immediately, in case bearing power descends, overcurrent protective device will recover normal operation at once.
Claims (2)
1. direct current overcurrent protective device, it comprises 15～85V DC power supply, DC power supply filter circuit, unidirectional thyristor circuits for triggering and control circuit thereof, overcurrent identification circuit, direct current output state indicating circuit, it is characterized in that:
Described unidirectional thyristor circuits for triggering and control circuit thereof are comprised of unidirectional thyristor SCR, key switch AN and dropping resistor R3, the anode of unidirectional thyristor SCR connects the anodal VCC of 15～85V DC power supply and the end of key switch AN, the other end of key switch AN is by the control utmost point of dropping resistor R3 order to thyristor SCR, and the negative electrode of unidirectional thyristor SCR is taken over the stream identification circuit;
Described overcurrent identification circuit is comprised of NPN transistor VT1, sample resistance R2, the base stage order of NPN transistor VT1 is to the negative electrode of thyristor SCR and the end of sample resistance R2, the emitter of NPN transistor VT1 accesses the other end of sample resistance R 2 and the anodal VCC1 of DC output end, and the collector electrode of NPN transistor VT1 meets the anodal VCC of 15～85V DC power supply.
2. direct current overcurrent protective device according to claim 1; it is characterized in that: in direct current output state indicating circuit, the positive pole of LED meets the anodal VCC1 of 12～80V DC output end by dropping resistor R1; the negative pole connection circuit ground GND of LED, the negative pole of 15～85V DC power supply is connected with circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220663530 CN202930899U (en) | 2012-12-05 | 2012-12-05 | Direct current overcurrent protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220663530 CN202930899U (en) | 2012-12-05 | 2012-12-05 | Direct current overcurrent protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202930899U true CN202930899U (en) | 2013-05-08 |
Family
ID=48220809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220663530 Expired - Fee Related CN202930899U (en) | 2012-12-05 | 2012-12-05 | Direct current overcurrent protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202930899U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104427697A (en) * | 2013-08-28 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Current-limiting circuit and illumination device |
| EP3375093A4 (en) * | 2015-11-13 | 2019-07-10 | Silicon Power Corporation | Low-loss and fast acting solid-state breaker |
-
2012
- 2012-12-05 CN CN 201220663530 patent/CN202930899U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104427697A (en) * | 2013-08-28 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Current-limiting circuit and illumination device |
| EP3375093A4 (en) * | 2015-11-13 | 2019-07-10 | Silicon Power Corporation | Low-loss and fast acting solid-state breaker |
| US10985546B2 (en) | 2015-11-13 | 2021-04-20 | Excelitas Technologies Corp. | Low-loss and fast acting solid-state breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20131205 |