CN2185480Y - Protector for overcurrent and short circuit of load - Google Patents
Protector for overcurrent and short circuit of load Download PDFInfo
- Publication number
- CN2185480Y CN2185480Y CN 94201247 CN94201247U CN2185480Y CN 2185480 Y CN2185480 Y CN 2185480Y CN 94201247 CN94201247 CN 94201247 CN 94201247 U CN94201247 U CN 94201247U CN 2185480 Y CN2185480 Y CN 2185480Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- control circuit
- jag
- actuator
- overcurrent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a protector for over current and load short circuit, comprising a DC regulated circuit, a control circuit, an actuating mechanism, and a signal detection circuit which is a reed switch JAG-4. The current coil of the reed switch JAG-4 is connected to the live wire of an AC supply loop. One end of the contact of the reed switch JAG-4 is connected with the input end of the control circuit, and the other end is grounded. The utility model has simple control structure and reliable performance.
Description
The utility model belongs to a kind of protective device of ac power supply line, is particularly suitable for online passing by when flowing with load short circuits and is used for blocking power supply, to avoid accident.
Overcurrent and load short circuits are often to occur in the ac power supply line, when this phenomenon takes place, as the untimely safeguard measure of taking, as block current supply circuit, then be easy to cause serious accident, as burn out supply line, device, even initiation fire.Usually all there is unsatisfactory part in existing various similar protective device.
The purpose of this utility model is to provide a kind of novel overcurrent and load short circuits protective device, makes its protective value really reliable.
Major technique measure of the present utility model is as follows:
A kind of overcurrent and load short circuits protective device; have direct current regulation circuit, control circuit, actuator and signal deteching circuit; the input of control circuit and the output of signal deteching circuit join; its output and actuator join; this actuator is a relay K; the normally-closed contact K1-1 of relay K is connected on the live wire and ground wire of ac power supply circuit; its signal deteching circuit is tongue tube JAG-4; the current coil of tongue tube JAG-4 is connected on the live wire of ac power supply circuit, and its two ends, contact connect the input and the ground connection of control circuit respectively.
The utility model control structure is simple, and dependable performance has reached the purpose of controlling big electric current with small-signal.
Accompanying drawing provides an embodiment of the present utility model:
Fig. 1 is overcurrent and load short circuits protective device electrical schematic diagram.
Below in conjunction with accompanying drawing the utility model is further described:
A kind of overcurrent and load short circuits protective device; has direct current regulation circuit; control circuit; actuator and signal deteching circuit; its direct current regulation circuit is by transformer T; rectifier diode VD3-VD6; voltage-stabiliser tube VD2 and filter capacitor C4 form; the input of control circuit and the output of signal deteching circuit join; its output and actuator join; this actuator is a relay K; the normally-closed contact K1-1 of relay K is connected on the live wire and ground wire of ac power supply circuit; its signal deteching circuit is tongue tube JAG-4; the current coil of tongue tube JAG-4 is connected on the live wire of ac power supply circuit, and its two ends, contact connect the live wire and the ground connection of control circuit respectively.
Its control circuit is made up of ic chip and auxiliary circuit thereof, ic chip can be selected the NE555 type for use, and its " 2 " pin is an input, and " 3 " pin is an output, on its control end " 6 ", " 7 " bipod, be connected to one by circuit resistance R3, the integrator delay-time circuit that capacitor C 3 is formed.
Simultaneously, also be connected to a light-emitting diode VD1 on the output of control circuit, light-emitting diode VD1 connects with resistance R 2, to increase luminous deixis.
Operation principle of the present utility model is as follows:
Select tongue tube JAG-4, make it normally be electric current lower contact maintenance off-state, when overcurrent or load short circuits phenomenon take place when, the electric current that flows through among the tongue tube JAG-4 sharply increases, when reaching certain limit, the contact adhesive of tongue tube JAG-4, make " 2 " pin ground connection of integrated package NE555 be low level, " 3 " pin is turned into high level, relay K gets electric adhesive, block ac power supply circuit, behind the delay time of determining via R3, C3, could control integrated package NE555 and be turned to normal condition.
Claims (3)
1; a kind of overcurrent and load short circuits protective device; has direct current regulation circuit; control circuit; actuator and signal deteching circuit; the input of control circuit and the output of signal deteching circuit join; its output and actuator join; actuator is a relay K; the normally-closed contact K1-1 of relay K is connected on the live wire and ground wire of ac power supply circuit; it is characterized in that: described signal deteching circuit is tongue tube JAG-4; the current coil of the JAG-4 of tongue tube is connected on the live wire of ac power supply circuit, and its two ends, contact connect the input and the ground connection of control circuit respectively.
2, device according to claim 1, it is characterized in that its control circuit is made up of ic chip and auxiliary circuit thereof, ic chip is the NE555 type, is connected to an integrator delay-time circuit of being made up of resistance R 3, capacitor C 3 on its control end " 6 " " 7 " bipod.
3, device according to claim 1 and 2 is characterized in that also being connected to a light-emitting diode VD1 on the output of control circuit, light-emitting diode VD1 connects with resistance R 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94201247 CN2185480Y (en) | 1994-01-06 | 1994-01-06 | Protector for overcurrent and short circuit of load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94201247 CN2185480Y (en) | 1994-01-06 | 1994-01-06 | Protector for overcurrent and short circuit of load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2185480Y true CN2185480Y (en) | 1994-12-14 |
Family
ID=33821364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94201247 Expired - Fee Related CN2185480Y (en) | 1994-01-06 | 1994-01-06 | Protector for overcurrent and short circuit of load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2185480Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103426699A (en) * | 2013-08-08 | 2013-12-04 | 东莞市兆南电子电器科技有限公司 | Safe and sensitive over-current protector |
-
1994
- 1994-01-06 CN CN 94201247 patent/CN2185480Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103426699A (en) * | 2013-08-08 | 2013-12-04 | 东莞市兆南电子电器科技有限公司 | Safe and sensitive over-current protector |
| WO2015018180A1 (en) * | 2013-08-08 | 2015-02-12 | 东莞市兆南电子电器科技有限公司 | Safe and sensitive over-current protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |