CN202150690U - Protective device of auxiliary power supply - Google Patents
Protective device of auxiliary power supply Download PDFInfo
- Publication number
- CN202150690U CN202150690U CN201120246999U CN201120246999U CN202150690U CN 202150690 U CN202150690 U CN 202150690U CN 201120246999 U CN201120246999 U CN 201120246999U CN 201120246999 U CN201120246999 U CN 201120246999U CN 202150690 U CN202150690 U CN 202150690U
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- accessory power
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Abstract
The utility model relates to a protective device of an auxiliary power supply, applied to a switch power supply device. The switch power supply device comprises an auxiliary power supply unit, wherein the auxiliary power supply unit comprises an output voltage subunit. The protective device comprises a first current detection unit, a switch unit, an optical coupling unit and a Zener diode unit. When the first current detection unit detects that current of the auxiliary power supply unit exceeds a current preset value, the switch unit is conducted, and then the optical coupling unit sends an over-current protection signal to the switch power supply device to achieve an over-current protection mechanism. When an output voltage outputted by the output voltage subunit exceeds a voltage preset value, the Zener diode is conducted, and then the optical coupling unit sends an over-voltage signal to the switch power supply device to achieve an over-voltage protection mechanism. The protective device is simple in circuit design and low in energy loss.
Description
Technical field
The utility model relates to a kind of protective device, particularly a kind of protective device of accessory power supply.
Background technology
Please refer to Fig. 1, it is a known switches supply unit application party block diagram.One switching power unit 10 is applied to an ac power supply apparatus 20 and a load device 30; This switching power unit 10 comprises a main out-put supply unit 102 and an accessory power supply unit 104.This main out-put supply unit 102 is electrically connected to this ac power supply apparatus 20, this accessory power supply unit 104 and this load device 30; This accessory power supply unit 104 is electrically connected to this ac power supply apparatus 20 and this main out-put supply unit 102.
This ac power supply apparatus 20 sends an AC power to this main out-put supply unit 102 and this accessory power supply unit 104; This accessory power supply unit 104 receives after this AC power, and this accessory power supply unit 104 sends a driving power and gives this main out-put supply unit 102, so as to driving this main out-put supply unit 102; This main out-put supply unit 102 receives after this AC power, and this main out-put supply unit 102 sends a load power source and gives this load device 30, gives this load device 30 so as to power supply is provided.
This accessory power supply unit 104 needs some overvoltage and over current protection protection mechanism usually, and the present known practice is to adopt comparator or amplifier or the like integrated circuit to realize; Yet the circuit design of these integrated circuits is quite complicated, and all needs certain grid bias power supply ability operate as normal, therefore can cause the energy loss of certain degree.
Summary of the invention
For improving the shortcoming of above-mentioned known technology, the purpose of the utility model is to provide a kind of protective device of accessory power supply, and the circuit design of the protective device of this accessory power supply is simple and energy loss is extremely low.
For reaching the above-mentioned purpose of the utility model; The protective device of the accessory power supply of the utility model is applied to a switching power unit; This switching power unit comprises an accessory power supply unit; This accessory power supply unit comprises an output voltage subelement, and the protective device of this accessory power supply comprises: a switch element comprises a switch element first pin, a switch element second pin and a switch element the 3rd pin; One first resistance unit, first end of this first resistance unit is electrically connected to this output voltage subelement, and second end of this first resistance unit is electrically connected to this switch element first pin; One second resistance unit, first end of this second resistance unit is electrically connected to this output voltage subelement, and second end of this second resistance unit is electrically connected to this switch element second pin; One the 3rd resistance unit, first end of the 3rd resistance unit are electrically connected to this switch element second pin, and second end of the 3rd resistance unit is electrically connected to ground; One first current detecting unit, first end of this first current detecting unit is electrically connected to this accessory power supply unit, and second end of this first current detecting unit is electrically connected to this switch element the 3rd pin; One optical coupling unit; Comprise an optical coupling unit first pin, an optical coupling unit second pin, an optical coupling unit the 3rd pin and an optical coupling unit the 4th pin; This optical coupling unit first pin is electrically connected to this output voltage subelement; This optical coupling unit second pin is electrically connected to this switch element first pin, and this optical coupling unit the 3rd pin is electrically connected to this switching power unit, and this optical coupling unit the 4th pin is electrically connected to this switching power unit; And a Zener diode, the negative electrode of this zener diode cell is electrically connected to this optical coupling unit second pin, and the anode of this zener diode cell is electrically connected to ground.Wherein, When the electric current that detects this accessory power supply unit when this first current detecting unit surpasses an electric current preset value; With this switch element conducting, send an overcurrent protection signal to this switching power unit through this optical coupling unit afterwards, to reach the over current protection protection mechanism; When an output voltage of being exported when this output voltage subelement surpassed a voltage preset value, this zener diode cell can conducting, sends an overvoltage protection signal to this switching power unit through this optical coupling unit afterwards, to reach overvoltage protection mechanism.
The protective device of the accessory power supply of the utility model; Preferably; The protective device of this accessory power supply also comprises a temperature compensation unit, and first end of this temperature compensation unit is electrically connected to second end of this second resistance unit, and second end of this temperature compensation unit is electrically connected to ground.
The protective device of the accessory power supply of the utility model; Preferably; The protective device of this accessory power supply also comprises a variable resistor unit, and first end of this variable resistor unit is electrically connected to second end of this second resistance unit, and second end of this variable resistor unit is electrically connected to ground.
The protective device of the accessory power supply of the utility model; Preferably; The protective device of this accessory power supply also comprises a capacitor cell, and first end of this capacitor cell is electrically connected to this switch element second pin, and second end of this capacitor cell is electrically connected to this switch element the 3rd pin.
The protective device of the accessory power supply of the utility model; Preferably; The protective device of this accessory power supply also comprises one the 4th resistance unit; First end of the 4th resistance unit is electrically connected to this switch element first pin, and second end of the 4th resistance unit is electrically connected to this optical coupling unit second pin.
The protective device of the accessory power supply of the utility model; Preferably; The protective device of this accessory power supply also comprises one the 5th resistance unit; First end of the 5th resistance unit is electrically connected to second end of this second resistance unit, and second end of the 5th resistance unit is electrically connected to this switch element second pin.
The protective device of the accessory power supply of the utility model; Preferably; The protective device of this accessory power supply also comprises one the 6th resistance unit; First end of the 6th resistance unit is electrically connected to second end of this second resistance unit, and second end of the 6th resistance unit is electrically connected to first end of the 3rd resistance unit and first end of this variable resistor unit.
The protective device of the accessory power supply of the utility model; Preferably; The protective device of this accessory power supply also comprises: one second current detecting unit; First end of this second current detecting unit is electrically connected to this accessory power supply unit, and second end of this second current detecting unit is electrically connected to this switch element the 3rd pin; And one the 3rd current detecting unit, first end of the 3rd current detecting unit is electrically connected to this accessory power supply unit, and second end of the 3rd current detecting unit is electrically connected to this switch element the 3rd pin.
The protective device of the accessory power supply of the utility model, preferred, this switch element is a transistor switch, and this optical coupling unit is an optical coupler, and this temperature compensation unit is a negative tempperature coefficient thermistor.
The protective device of the accessory power supply of the utility model, preferred, this first current detecting unit is a resistance, and this second current detecting unit is a resistance, and the 3rd current detecting unit is a resistance.
The beneficial effect of the utility model is to make the circuit design of protective device of accessory power supply simple and energy loss is extremely low.
Description of drawings
Fig. 1 is a known switches supply unit application party block diagram.
Fig. 2 is the protective device block diagram of the accessory power supply of the utility model.
Wherein, description of reference numerals is following:
Switching power unit 10
Main out-put supply unit 102
Accessory power supply unit 104
Output voltage subelement 106
Ac power supply apparatus 20
Load device 30
The protective device 40 of accessory power supply
Switch element 402
First resistance unit 404
Second resistance unit 406
The 3rd resistance unit 408
First current detecting unit 410
Optical coupling unit 412
Zener diode cell 414
Temperature compensation unit 416
Variable resistor unit 418
Capacitor cell 420
The 4th resistance unit 422
The 5th resistance unit 424
The 6th resistance unit 426
Second current detecting unit 428
The 3rd current detecting unit 430
Switch element first pin 432
Switch element second pin 434
Switch element the 3rd pin 436
Optical coupling unit first pin 438
Optical coupling unit second pin 440
Optical coupling unit the 3rd pin 442
Optical coupling unit the 4th pin 444
Embodiment
Please refer to Fig. 2, it is the protective device block diagram of the accessory power supply of the utility model.The protective device 40 of the accessory power supply of the utility model is applied to a switching power unit 10, and this switching power unit 10 comprises an accessory power supply unit 104, and this accessory power supply unit 104 comprises an output voltage subelement 106.
The protective device 40 of this accessory power supply comprises a switch element 402, one first resistance unit 404, one second resistance unit 406, one the 3rd resistance unit 408, one first current detecting unit 410, an optical coupling unit 412 and a Zener diode 414.
The protective device 40 of this accessory power supply also comprises a temperature compensation unit 416, a variable resistor unit 418, a capacitor cell 420, one the 4th resistance unit 422, one the 5th resistance unit 424, one the 6th resistance unit 426, one second current detecting unit 428 and one the 3rd current detecting unit 430.
This switch element 402 comprises a switch element first pin 432, a switch element second pin 434 and a switch element the 3rd pin 436; This optical coupling unit 412 comprises an optical coupling unit first pin 438, an optical coupling unit second pin 440, an optical coupling unit the 3rd pin 442 and an optical coupling unit the 4th pin 444.
First end of this first resistance unit 404 is electrically connected to this output voltage subelement 106; Second end of this first resistance unit 404 is electrically connected to this switch element first pin 432; First end of this second resistance unit 406 is electrically connected to this output voltage subelement 106; Second end of this second resistance unit 406 is electrically connected to this switch element second pin 434.
First end of the 3rd resistance unit 408 is electrically connected to this switch element second pin 434; Second end of the 3rd resistance unit 408 is electrically connected to ground; First end of this first current detecting unit 410 is electrically connected to this accessory power supply unit 104; Second end of this first current detecting unit 410 is electrically connected to this switch element the 3rd pin 436.
This optical coupling unit first pin 438 is electrically connected to this output voltage subelement 106; This optical coupling unit second pin 440 is electrically connected to this switch element first pin 432; This optical coupling unit the 3rd pin 442 is electrically connected to this switching power unit 10; This optical coupling unit the 4th pin 442 is electrically connected to this switching power unit 10; The negative electrode of this zener diode cell 414 is electrically connected to this optical coupling unit second pin 440; The anode of this zener diode cell 414 is electrically connected to ground.
First end of this temperature compensation unit 416 is electrically connected to second end of this second resistance unit 406; Second end of this temperature compensation unit 416 is electrically connected to ground; First end of this variable resistor unit 418 is electrically connected to second end of this second resistance unit 406; Second end of this variable resistor unit 418 is electrically connected to ground; First end of this capacitor cell 420 is electrically connected to this switch element second pin 434; Second end of this capacitor cell 420 is electrically connected to this switch element the 3rd pin 436.
First end of the 4th resistance unit 422 is electrically connected to this switch element first pin 432; Second end of the 4th resistance unit 422 is electrically connected to this optical coupling unit second pin 440; First end of the 5th resistance unit 424 is electrically connected to second end of this second resistance unit 406; Second end of the 5th resistance unit 424 is electrically connected to this switch element second pin 434; First end of the 6th resistance unit 426 is electrically connected to second end of this second resistance unit 406; Second end of the 6th resistance unit 426 is electrically connected to first end of the 3rd resistance unit 408 and first end of this variable resistor unit 418.
First end of this second current detecting unit 428 is electrically connected to this accessory power supply unit 104; Second end of this second current detecting unit 428 is electrically connected to this switch element the 3rd pin 436; First end of the 3rd current detecting unit 430 is electrically connected to this accessory power supply unit 104; Second end of the 3rd current detecting unit 430 is electrically connected to this switch element the 3rd pin 436.
This switch element 402 can be a transistor switch; This optical coupling unit 412 can be an optical coupler; This temperature compensation unit 416 can be a negative tempperature coefficient thermistor, and so as to the electric current through this switch element 402 (transistor switch) is compensated during to variations in temperature, it is comparatively stable to make it pass through electric current; This first current detecting unit 410 can be a resistance; This second current detecting unit 428 can be a resistance; The 3rd current detecting unit 430 can be a resistance; This variable resistor unit 418 can be a variable resistor, so as to the range size of adjustment over current protection protection mechanism.
When the electric current that detects this accessory power supply unit 104 when this first current detecting unit 410 surpasses an electric current preset value; With these switch element 402 conductings; Send an overcurrent protection signal to this switching power unit 10 through this optical coupling unit 412 afterwards, to reach over current protection protection mechanism (for example close this accessory power supply unit 104 or adjust the electric current of this accessory power supply unit 104).
When an output voltage of being exported when this output voltage subelement 106 surpasses a voltage preset value; These zener diode cell 414 meeting conductings; Send an overvoltage protection signal to this switching power unit 10, to reach overvoltage protection mechanism (for example close this accessory power supply unit 104 or adjust this output voltage that this output voltage subelement 106 is exported) through this optical coupling unit 412 afterwards.
Not like the complex circuit designs of known technology overvoltage and over current protection protection mechanism and cause sizable energy loss, the circuit design of the protective device of the accessory power supply of the utility model is simple and energy loss is extremely low.
Claims (10)
1. the protective device of an accessory power supply is applied to a switching power unit, it is characterized in that, this switching power unit comprises an accessory power supply unit, and this accessory power supply unit comprises an output voltage subelement, and the protective device of this accessory power supply comprises:
One switch element comprises a switch element first pin, a switch element second pin and a switch element the 3rd pin;
One first resistance unit, first end of this first resistance unit is electrically connected to this output voltage subelement, and second end of this first resistance unit is electrically connected to this switch element first pin;
One second resistance unit, first end of this second resistance unit is electrically connected to this output voltage subelement, and second end of this second resistance unit is electrically connected to this switch element second pin;
One the 3rd resistance unit, first end of the 3rd resistance unit are electrically connected to this switch element second pin, and second end of the 3rd resistance unit is electrically connected to ground;
One first current detecting unit, first end of this first current detecting unit is electrically connected to this accessory power supply unit, and second end of this first current detecting unit is electrically connected to this switch element the 3rd pin;
One optical coupling unit; Comprise an optical coupling unit first pin, an optical coupling unit second pin, an optical coupling unit the 3rd pin and an optical coupling unit the 4th pin; This optical coupling unit first pin is electrically connected to this output voltage subelement; This optical coupling unit second pin is electrically connected to this switch element first pin, and this optical coupling unit the 3rd pin is electrically connected to this switching power unit, and this optical coupling unit the 4th pin is electrically connected to this switching power unit; And
One Zener diode, the negative electrode of this zener diode cell are electrically connected to this optical coupling unit second pin, and the anode of this zener diode cell is electrically connected to ground;
Wherein, When the electric current that detects this accessory power supply unit when this first current detecting unit surpasses an electric current preset value; With this switch element conducting, send an overcurrent protection signal to this switching power unit through this optical coupling unit afterwards, to reach the over current protection protection mechanism; When an output voltage of being exported when this output voltage subelement surpassed a voltage preset value, this zener diode cell can conducting, sends an overvoltage protection signal to this switching power unit through this optical coupling unit afterwards, to reach overvoltage protection mechanism.
2. the protective device of accessory power supply as claimed in claim 1; It is characterized in that; The protective device of this accessory power supply also comprises a temperature compensation unit; First end of this temperature compensation unit is electrically connected to second end of this second resistance unit, and second end of this temperature compensation unit is electrically connected to ground.
3. the protective device of accessory power supply as claimed in claim 2; It is characterized in that; The protective device of this accessory power supply also comprises a variable resistor unit; First end of this variable resistor unit is electrically connected to second end of this second resistance unit, and second end of this variable resistor unit is electrically connected to ground.
4. the protective device of accessory power supply as claimed in claim 3; It is characterized in that; The protective device of this accessory power supply also comprises a capacitor cell; First end of this capacitor cell is electrically connected to this switch element second pin, and second end of this capacitor cell is electrically connected to this switch element the 3rd pin.
5. the protective device of accessory power supply as claimed in claim 4; It is characterized in that; The protective device of this accessory power supply also comprises one the 4th resistance unit; First end of the 4th resistance unit is electrically connected to this switch element first pin, and second end of the 4th resistance unit is electrically connected to this optical coupling unit second pin.
6. the protective device of accessory power supply as claimed in claim 5; It is characterized in that; The protective device of this accessory power supply also comprises one the 5th resistance unit; First end of the 5th resistance unit is electrically connected to second end of this second resistance unit, and second end of the 5th resistance unit is electrically connected to this switch element second pin.
7. the protective device of accessory power supply as claimed in claim 6; It is characterized in that; The protective device of this accessory power supply also comprises one the 6th resistance unit; First end of the 6th resistance unit is electrically connected to second end of this second resistance unit, and second end of the 6th resistance unit is electrically connected to first end of the 3rd resistance unit and first end of this variable resistor unit.
8. the protective device of accessory power supply as claimed in claim 7 is characterized in that, the protective device of this accessory power supply also comprises:
One second current detecting unit, first end of this second current detecting unit is electrically connected to this accessory power supply unit, and second end of this second current detecting unit is electrically connected to this switch element the 3rd pin; And
One the 3rd current detecting unit, first end of the 3rd current detecting unit is electrically connected to this accessory power supply unit, and second end of the 3rd current detecting unit is electrically connected to this switch element the 3rd pin.
9. the protective device of accessory power supply as claimed in claim 8 is characterized in that, this switch element is a transistor switch, and this optical coupling unit is an optical coupler, and this temperature compensation unit is a negative tempperature coefficient thermistor.
10. the protective device of accessory power supply as claimed in claim 9 is characterized in that, this first current detecting unit is a resistance, and this second current detecting unit is a resistance, and the 3rd current detecting unit is a resistance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120246999U CN202150690U (en) | 2011-07-13 | 2011-07-13 | Protective device of auxiliary power supply |
| TW100214701U TWM430759U (en) | 2011-07-13 | 2011-08-08 | Protection apparatus of auxiliary power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120246999U CN202150690U (en) | 2011-07-13 | 2011-07-13 | Protective device of auxiliary power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202150690U true CN202150690U (en) | 2012-02-22 |
Family
ID=45591741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120246999U Expired - Lifetime CN202150690U (en) | 2011-07-13 | 2011-07-13 | Protective device of auxiliary power supply |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN202150690U (en) |
| TW (1) | TWM430759U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108448A (en) * | 2012-12-18 | 2013-05-15 | 刘珉恺 | Large-dynamic temperature-compensation type high-precision constant-current primary circuit |
| CN107465173A (en) * | 2017-08-16 | 2017-12-12 | 中国电子科技集团公司第十八研究所 | A kind of space power system accessory power supply protection circuit |
-
2011
- 2011-07-13 CN CN201120246999U patent/CN202150690U/en not_active Expired - Lifetime
- 2011-08-08 TW TW100214701U patent/TWM430759U/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108448A (en) * | 2012-12-18 | 2013-05-15 | 刘珉恺 | Large-dynamic temperature-compensation type high-precision constant-current primary circuit |
| CN107465173A (en) * | 2017-08-16 | 2017-12-12 | 中国电子科技集团公司第十八研究所 | A kind of space power system accessory power supply protection circuit |
| CN107465173B (en) * | 2017-08-16 | 2019-11-08 | 中国电子科技集团公司第十八研究所 | A kind of space power system accessory power supply protection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM430759U (en) | 2012-06-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120222 |
|
| CX01 | Expiry of patent term |