CN2413420Y - Over-voltage and over-current protector for switch power supply - Google Patents
Over-voltage and over-current protector for switch power supply Download PDFInfo
- Publication number
- CN2413420Y CN2413420Y CN 00202936 CN00202936U CN2413420Y CN 2413420 Y CN2413420 Y CN 2413420Y CN 00202936 CN00202936 CN 00202936 CN 00202936 U CN00202936 U CN 00202936U CN 2413420 Y CN2413420 Y CN 2413420Y
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- over
- foot
- pin
- voltage
- chip
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- 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 an over-voltage and over-current protecting device for a switching power supply, which comprises an NE555 chip. A parallel circuit of a resistor R5 and a diode D1 is in bridge connection between a foot 2 and a foot 3 of the chip. A foot 1 of the chip is connected with the ground. The foot 2 is connected with the ground through a capacitor C1. A foot 5 is connected with the ground through a resistor R 4. A foot 6 and the foot 3 are leading out ends. The foot 6 is connected with the detection signal output end of a protective circuit. Working pulse signals are controlled by the foot 3 to be shut and started. The utility model has the advantages of fast response, reliability, simple structure and a low price. The over-voltage and over-current protecting device has the function of automatic time delay and reset. The utility model can be widely used for various circuits and equipment which require fast protection.
Description
The utility model relates to a kind of over-voltage over-current protection device of Switching Power Supply.
In Switching Power Supply; the proof voltage and the rush of current of semiconductor device (diode, MOSFET, IGBT, GTO, SCR etc.) are limited in one's ability; too high voltage and current surpasses certain hour can cause device failure; and this time is very short; be generally the microsecond level, conventional fuse protection is not generally prove effective, and more at the used element of overvoltage, overcurrent protector that adopts at present; and after the protection release, need manual reset, use comparatively inconvenience.
The purpose of this utility model provides a kind of simple in structure, inexpensive, response fast and reliable, the over-voltage and over-current protector of Switching Power Supply easy to use.
The over-voltage and over-current protector of the Switching Power Supply that the utility model provides comprises the NE555 chip; the parallel circuits of cross-over connection resistance R 5 and diode D1 between 2 pin of this chip and 3 pin, 1 pin ground connection of chip, 2 pin are by capacitor C 1 ground connection; 5 pin are by resistance R 4 ground connection, and 6 pin and 3 pin are respectively exit.
During use; 6 pin of the over-voltage and over-current protector of Switching Power Supply are linked to each other with the detection signal output of protected circuit; 3 pin go to control the blockade of protected circuit working pulse signal and open-minded, suppose NE555 the 3rd pin output high level for normal, and low level is protection.Determine protection point fault value by the resistance of resistance R 4.During normal the operation; 3 pin output high level; the voltage of capacitor C 1 is near chip operating voltage VCC; when the over-voltage and over-current situation takes place; the input of the 6th pin is during greater than the fault value set, the inner rest-set flip-flop upset of NE555, the protection of 3 pin output low levels; capacitor C 1 is by resistance R 5 discharges subsequently; through time-delay, when the voltage of capacitor C 1 less than a half of setting the fault value, the inner rest-set flip-flop of NE555 overturns again; 3 pin output high level; diode D1 rises at once near chip operating voltage VCC the voltage of capacitor C 1, if this moment, 6 pin were imported less than the fault value, the output of 3 pin maintains high level; otherwise the output of 3 pin is the low level protection again at once.Thus, and have the automatic time delay reset function, can change delay time by the value that changes resistance R 5 and capacitor C 3.
The utility model is owing to adopt the NE555 chip, and its speed is very fast, so protection response fast and reliable; the peripheral circuit element of using is few, and is simple in structure, inexpensive; and can reset through time-delay after the protection release, do not need manual reset, so use easily.
Below in conjunction with accompanying drawing the utility model is described in detail.
Fig. 1 is that the utility model constitutes schematic diagram.
With reference to Fig. 1; the over-voltage and over-current protector of Switching Power Supply comprises the NE555 chip; the parallel circuits of cross-over connection resistance R 5 and diode D1 between 2 pin of this chip and 3 pin; 1 pin ground connection of chip; 2 pin are by capacitor C 1 ground connection; 5 pin are by resistance R 4 ground connection, and 6 pin and 3 pin are respectively exit, and 8 pin meet working power VCC.Usually; for the over-voltage and over-current protector that makes Switching Power Supply has protection indication, also can be as shown in the figure, series resistor R6 and LED between 8 pin of NE555 chip and 7 pin; like this; when normal operation, 3 pin output high level, 7 pin also are high level; LED extinguishes; be output as the low level protection and work as 3 pin, 7 pin also are low level, and LED is bright.
Switching Power Supply over-voltage and over-current protector of the present utility model can be widely used in all kinds of the needs circuit and the equipment of protection fast.
Claims (2)
1. the over-voltage and over-current protector of Switching Power Supply is characterized in that it comprises the NE555 chip, the parallel circuits of cross-over connection resistance R 5 and diode D1 between 2 pin of this chip and 3 pin; 1 pin ground connection of chip; 2 pin are by capacitor C 1 ground connection, and 5 pin are by resistance R 4 ground connection, and 6 pin and 3 pin are respectively exit.
2. by the over-voltage and over-current protector of the described Switching Power Supply of claim 1, it is characterized in that series resistor R6 and LED between 8 pin of NE555 chip and 7 pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00202936 CN2413420Y (en) | 2000-01-24 | 2000-01-24 | Over-voltage and over-current protector for switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00202936 CN2413420Y (en) | 2000-01-24 | 2000-01-24 | Over-voltage and over-current protector for switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2413420Y true CN2413420Y (en) | 2001-01-03 |
Family
ID=33571739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00202936 Expired - Fee Related CN2413420Y (en) | 2000-01-24 | 2000-01-24 | Over-voltage and over-current protector for switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2413420Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107666291A (en) * | 2017-09-07 | 2018-02-06 | 沈阳铁路信号有限责任公司 | Train TWC system power amplifiers guard method and protection circuit |
-
2000
- 2000-01-24 CN CN 00202936 patent/CN2413420Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107666291A (en) * | 2017-09-07 | 2018-02-06 | 沈阳铁路信号有限责任公司 | Train TWC system power amplifiers guard method and protection circuit |
| CN107666291B (en) * | 2017-09-07 | 2021-08-24 | 沈阳铁路信号有限责任公司 | Train TWC system power amplifier protection method and protection circuit |
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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 |