CN102751697A - Direct-current power supply over-current fuse wire - Google Patents
Direct-current power supply over-current fuse wire Download PDFInfo
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- CN102751697A CN102751697A CN2012102598631A CN201210259863A CN102751697A CN 102751697 A CN102751697 A CN 102751697A CN 2012102598631 A CN2012102598631 A CN 2012102598631A CN 201210259863 A CN201210259863 A CN 201210259863A CN 102751697 A CN102751697 A CN 102751697A
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Abstract
The invention discloses a direct-current power supply over-current fuse wire. The direct-current power supply over-current fuse wire consists of a 12-90V direct-current power supply, a direct-current power supply filter circuit, a unidirectional thyristor, a unidirectional thyristor trigger circuit, an over-current detection circuit and a direct-current output state indicator circuit. The general fuse wire cannot be used as a sensitive protection device due to slower over-current response, and once the general fuse wire is broken, the broken fuse wire is not always discovered immediately. If one circuit can be used as a substitute for monitoring the working state of the fuse wire, when the direct-current power supply is in the over-current state, the over-current state can be prompted through an indicator lamp and a user or a repairer can be helped to quickly and intuitively find the position of a fault. The circuit of the direct-current power supply over-current fuse wire has the characteristics of quick over-current breaking, fast recovering speed and wide direct-current power supply voltage range, and can be applied to any direct-current circuit as an over-current protection device.
Description
Technical field
The invention belongs to electronics and power technique fields, relate to a kind of DC power supply overcurrent fuse.
Background technology
Because of the general insurance silk (fuse) that is used for the DC power supply overcurrent protection use simple, cheap, the scope of application is wide is widely used.But the reaction of its overcurrent of general insurance silk (fuse) is more blunt, thereby can not be as the sensitivity protection device, and general insurance silk (fuse) is in case fuse, and differing sometimes in time comes to light surely.If can replace and monitor the fuse operating state with a circuit, when DC power supply generation overcurrent, it can be pointed out through indicator light, can help user or maintenance personal to find guilty culprit quickly and intuitively.Therefore, a kind of DC power supply overcurrent fuse of research making just seems particularly necessary.
The circuit of DC power supply overcurrent fuse of the present invention has overcurrent quick flow-breaking, fast, the wide characteristics of DC power supply voltage range of resume speed, can be applicable to make overcurrent protective device in any DC circuit.
Below specify DC power supply overcurrent fuse of the present invention related technology contents in manufacturing process.
Summary of the invention
Goal of the invention and beneficial effect: the reaction of its overcurrent of general insurance silk (fuse) is more blunt, thereby can not be as the sensitivity protection device, and general insurance silk (fuse) is in case fuse, and differing sometimes comes to light surely at once.If can replace and monitor the fuse operating state with a circuit, when DC power supply generation overcurrent, it can be pointed out through indicator light, finds guilty culprit with helping user or maintenance personal's quicklook.
The circuit of DC power supply overcurrent fuse of the present invention has overcurrent quick flow-breaking, fast, the wide characteristics of DC power supply voltage range of resume speed, can be applicable to make overcurrent protective device in any DC circuit.
The operation principle of circuit: in using the DC power supply overcurrent fuse, when the moment that sensitive switch AN connects, unidirectional thyristor SCR conducting, DC circuit is conducting also.When the load power consumption increases to above specified permissible value; Voltage on the sample resistance R2 is during greater than 0.75V; NPN transistor BG1 conducting, voltage drops to the voltage of keeping that is lower than unidirectional thyristor SCR conducting between the collector electrode of NPN transistor BG1 and the base stage at this moment, and unidirectional thyristor SCR is turned off; Cut off 12～90V DC power supply simultaneously, direct current output services status indicator lamp LED extinguishes immediately.Resistance R 1 is a dropping resistor, is used to provide the unidirectional thyristor SCR trigger voltage of conducting.
Technical characterictic: the DC power supply overcurrent fuse, it is made up of 12～90V DC power supply, DC power supply filter circuit, unidirectional thyristor and circuits for triggering thereof, over-current detection circuit, direct current output state indicating circuit, and its characteristic comprises:
Unidirectional thyristor and circuits for triggering thereof: form by unidirectional thyristor SCR, sensitive switch AN and dropping resistor R1; The anode of unidirectional thyristor SCR connects the anodal VCC of 12～90V DC power supply and the end of sensitive switch AN; The other end of sensitive switch AN is through the control utmost point of dropping resistor R1 order to thyristor SCR, and the negative electrode of unidirectional thyristor SCR is taken over current detection circuit;
Over-current detection circuit: form by NPN transistor BG1, sample resistance R2; The base stage order of NPN transistor BG1 is to the negative electrode of thyristor SCR and the end of sample resistance R2; The emitter of NPN transistor BG1 accesses the other end of kind resistance R 2 and the anodal VCC1 of DC output end, and the collector electrode of NPN transistor BG1 meets the anodal VCC of 12～90V DC power supply;
Direct current output state indicating circuit: the positive pole of LED meets the anodal VCC of 12～90V DC power supply through dropping resistor R3, the negative pole connection circuit ground GND of LED, and the negative pole of 12～90V DC power supply links to each other with circuit ground GND.
Description of drawings
Accompanying drawing 1 is the circuit working schematic diagram of a kind of DC power supply overcurrent fuse of providing of embodiment.
Embodiment
Specification requirement according to the components and parts of the circuit working schematic diagram of DC power supply overcurrent fuse shown in the accompanying drawing 1 and description of drawings and the following stated is implemented, and can realize the present invention.
Components and parts technical parameter and selection
When DC power supply voltage≤100V, NPN transistor BG1 can select 3DD15 for use;
It is any model of 6A/200V that unidirectional thyristor SCR can select technical parameter for use;
Resistance R 1 resistance is the wire-wound resistor of 0.35 Ω, and the current value that allows to pass through is 2A;
The resistance of resistance R 2 is to confirm according to the electric current that DC power supply allows, that is: R2=0.75V/I (I is the current value that DC power supply allows), and the power of resistance R 2 is 5W; The resistance of dropping resistor R3 should just come according to the voltage of used DC power supply to confirm, span 1K Ω～6.2K Ω of dropping resistor R3, and DC power supply voltage is high more, and the value of dropping resistor R3 is big more;
LED is a red light emitting diodes, is used to indicate galvanic output services state;
12～90V DC power supply can be used non-constant voltage dc source, output maximum current >=2.5A.
Circuit production main points and circuit debugging
In the circuit of DC power supply overcurrent fuse; As long as the electronic devices and components performance of selecting for use is intact; And the components and parts annexation in the accompanying drawing is welded to specifications, physical connection line and welding quality through scrutiny correct after, circuit need not debugged basically and get final product operate as normal;
Experiment power supply can use the non-constant voltage dc source of 12～90V, output current >=2.5A, and according to different output voltage, DC output end is refuted and connect corresponding load, just greater than 2A, examines the state variation of this device at load current;
Attention: the overload current≤2A of DC power supply overcurrent fuse, when the loaded work piece electric current reached 2A, overcurrent fuse can move immediately, in case load current descends, overcurrent fuse will recover at once.
Claims (2)
1. DC power supply overcurrent fuse, it is made up of 12～90V DC power supply, DC power supply filter circuit, unidirectional thyristor and circuits for triggering thereof, over-current detection circuit, direct current output state indicating circuit, and its characteristic comprises:
Unidirectional thyristor and circuits for triggering thereof are made up of unidirectional thyristor SCR, sensitive switch AN and dropping resistor R1; The anode of unidirectional thyristor SCR connects the anodal VCC of 12～90V DC power supply and the end of sensitive switch AN; The other end of sensitive switch AN is through the control utmost point of dropping resistor R1 order to thyristor SCR, and the negative electrode of unidirectional thyristor SCR is taken over current detection circuit;
Over-current detection circuit is made up of NPN transistor BG1, sample resistance R2; The base stage order of NPN transistor BG1 is to the negative electrode of thyristor SCR and the end of sample resistance R2; The emitter of NPN transistor BG1 accesses the other end of kind resistance R 2 and the anodal VCC1 of DC output end, and the collector electrode of NPN transistor BG1 meets the anodal VCC of 12～90V DC power supply.
2. according to the described DC power supply overcurrent fuse of claim 1; It is characterized in that: the positive pole of the LED in the direct current output state indicating circuit meets the anodal VCC of 12～90V DC power supply through dropping resistor R3; The negative pole connection circuit ground GND of LED, the negative pole of 12～90V DC power supply links to each other with circuit ground GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102598631A CN102751697A (en) | 2012-07-25 | 2012-07-25 | Direct-current power supply over-current fuse wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102598631A CN102751697A (en) | 2012-07-25 | 2012-07-25 | Direct-current power supply over-current fuse wire |
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| Publication Number | Publication Date |
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| CN102751697A true CN102751697A (en) | 2012-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102598631A Pending CN102751697A (en) | 2012-07-25 | 2012-07-25 | Direct-current power supply over-current fuse wire |
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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 |
| CN106410742A (en) * | 2016-11-03 | 2017-02-15 | 长沙群瑞电子科技有限公司 | High-speed DC electronic fuse circuit |
| CN111516621A (en) * | 2020-05-31 | 2020-08-11 | 湖南行必达网联科技有限公司 | Automobile wire harness protection circuit and protection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980408A (en) * | 2010-12-03 | 2011-02-23 | 天津诺尔哈顿电器制造有限公司 | Overcurrent protection circuit |
| CN102025122A (en) * | 2009-09-18 | 2011-04-20 | 鸿富锦精密工业（深圳）有限公司 | Protective circuit |
| CN102103950A (en) * | 2011-02-28 | 2011-06-22 | 朱虹 | Direct current power supply fuse monitoring device with sound-light reminding |
| CN202737445U (en) * | 2012-07-25 | 2013-02-13 | 周芸 | Direct current power source over-current fuse |
-
2012
- 2012-07-25 CN CN2012102598631A patent/CN102751697A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025122A (en) * | 2009-09-18 | 2011-04-20 | 鸿富锦精密工业（深圳）有限公司 | Protective circuit |
| CN101980408A (en) * | 2010-12-03 | 2011-02-23 | 天津诺尔哈顿电器制造有限公司 | Overcurrent protection circuit |
| CN102103950A (en) * | 2011-02-28 | 2011-06-22 | 朱虹 | Direct current power supply fuse monitoring device with sound-light reminding |
| CN202737445U (en) * | 2012-07-25 | 2013-02-13 | 周芸 | Direct current power source over-current fuse |
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 |
| CN106410742A (en) * | 2016-11-03 | 2017-02-15 | 长沙群瑞电子科技有限公司 | High-speed DC electronic fuse circuit |
| CN111516621A (en) * | 2020-05-31 | 2020-08-11 | 湖南行必达网联科技有限公司 | Automobile wire harness protection circuit and protection method |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121024 |