CN202206124U - Power supply adopting simple and practical input undervoltage protection circuit - Google Patents
Power supply adopting simple and practical input undervoltage protection circuit Download PDFInfo
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- CN202206124U CN202206124U CN2011203157942U CN201120315794U CN202206124U CN 202206124 U CN202206124 U CN 202206124U CN 2011203157942 U CN2011203157942 U CN 2011203157942U CN 201120315794 U CN201120315794 U CN 201120315794U CN 202206124 U CN202206124 U CN 202206124U
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Abstract
The utility model discloses a power supply adopting a simple and practical input undervoltage protection circuit. The power supply comprises a main conversion module, a follow current and rectification filtration module, and a PWM/OVP control module; an external power supply is input into the main conversion module, converted by the main conversion module, output to the follow current and rectification filtration module, rectified into DC by the follow current and rectification filtration module, and then output to a load; and the PWM/OVP control module controls the main conversion module to work. The power supply is characterized by further comprising an undervoltage protection module, the undervoltage protection module samples the input voltage of the main conversion module, and outputs the sampling result to the power supply end of the PWM/OVP control module. The circuit structure of the power supply is based on a common flyback circuit, has a strong practicability is high, and through automatically detecting the input voltage, the power supply always works under a safe work state and stops working under an error state, so that the service life of the power supply is prolonged, and potential safety hazards caused by abnormal work of the power supply are prevented.
Description
Technical field
The utility model discloses a kind of Switching Power Supply, particularly a kind of power supply that adopts simple and practical input under-voltage protecting circuit.
Background technology
Growing along with Switching Power Supply, people are also increasingly high to the requirement of Switching Power Supply, as: wide magnitude of voltage input, stable output, over-current over-voltage protection etc.At present; The general function that can the tape input under-voltage protection of power supply on the market; Only leaning on nameplate sign " 100-240VAC " and specifications definition input threshold voltage is " 90-264VAC "; But so just tell the operating voltage range of user's power supply, truly do not play under-voltage protection.If the user in use; Because the variation that civil power can not be estimated and other reason cause power supply under low input during long-term work; Yin Wendu is too high, overheated fragile in the power supply meeting, and has entail dangers to users' such as catching fire the personal safety and the potential safety hazard of property loss.
Summary of the invention
The shortcoming that does not have under-voltage protection function to the above-mentioned Switching Power Supply of mentioning of the prior art; The utility model provides a kind of power supply that adopts simple and practical input under-voltage protecting circuit; It is provided with the under-voltage protection module, the input voltage of under-voltage protection module samples main transformer die change piece, and sampled result exported to the PWM/OVP control module; With when the brownout, realize under-voltage protection.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of power supply that adopts simple and practical input under-voltage protecting circuit; Described power supply comprises main transformer die change piece, afterflow rectification filtering module, PWM/OVP control module, and external power supply input main transformer die change piece is after main transformer die change piece carries out voltage transformation; Export to the afterflow rectification filtering module;, the afterflow rectification filtering module exports to load after being rectified into direct current, the work of PWM/OVP control module control main transformer die change piece, and power supply also comprises the under-voltage protection module; The input voltage of under-voltage protection module samples main transformer die change piece, and sampled result exported to the power end of PWM/OVP control module.
The technical scheme that its technical problem that solves the utility model adopts further comprises:
Described under-voltage protection module comprises upper offset resistance and the below-center offset resistance that is connected in series; Upper offset resistance is connected the input of main transformer die change piece; The below-center offset grounding through resistance; The common port of upper offset resistance and below-center offset resistance is connected with the base stage of triode Q1, the grounded collector of triode Q1, and the emitter of triode Q1 is connected with the PWM/OVP control module.
Described upper offset resistance comprises resistance R 1, resistance R 2 and the resistance R 3 that is connected in series successively.
Be connected in parallel to capacitor C 7 with described below-center offset resistance.
Be connected with diode D5 between the common port of described upper offset resistance and below-center offset resistance and the base stage of triode Q1.
Described power supply also comprises rectification filtering module, and external AC is exported to main transformer die change piece after the rectification filtering module rectification, the output voltage of under-voltage protection module samples rectification filtering module.
Described power supply also comprises lightning protection and overcurrent protection module, and external AC is exported to rectification filtering module after lightning protection and overcurrent protection module.
Described power supply also comprises the EMI filtration module; The EMI filtration module is connected between lightning protection and overcurrent protection module and the rectification filtering module; External AC is exported to the EMI filtration module after lightning protection and overcurrent protection module, after the filtering of EMI filtration module, export to rectification filtering module.
Described power supply also comprises the Voltage Feedback module, the output voltage of Voltage Feedback module samples afterflow rectification filtering module, and sampled signal fed back to the PWM/OVP control module.
The beneficial effect of the utility model is: the utility model can detect the height of the direct voltage of input AC voltage after the rectification filtering module rectification through under-voltage detection module; Control the operating voltage of PWM/OVP control module master chip again through the under-voltage protection module, thereby realize accurate defencive function.The utility model can be through the selection of sample resistance in the under-voltage protection module; Situation according to the power supply maximal work is accurately set suitable under-voltage protection working point; Let power supply under safe condition, work always; Promptly quit work under the abnormality, thereby promote the useful life of power supply and avoid the issuable potential safety hazard of abnormity of power supply work.The circuit structure of the utility model is the basis with common circuit of reversed excitation, and is practical, and the height through automatic detection input voltage lets power supply when low-voltage is imported, stop output, operate as normal when high voltage is imported.
To combine accompanying drawing and embodiment that the utility model is further specified below.
Description of drawings
Fig. 1 is the utility model circuit block diagram.
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
Present embodiment is the utility model preferred implementation, and other all its principles are identical with present embodiment or approximate with basic structure, all within the utility model protection range.
The utility model is a kind of power supply that adopts simple and practical input under-voltage protecting circuit, mainly comprises main transformer die change piece, afterflow rectification filtering module, PWM/OVP control module, external power supply input main transformer die change piece; After main transformer die change piece carries out voltage transformation, export to the afterflow rectification filtering module,, the afterflow rectification filtering module exports to load after being rectified into direct current; The work of PWM/OVP control module control main transformer die change piece; In the present embodiment, external power supply adopts electric main, also comprises rectification filtering module in the utility model; Export to main transformer die change piece after being used for external AC is rectified into direct current; In the present embodiment,, also be provided with lightning protection and overcurrent protection module in order to protect internal circuit safety; Lightning protection and overcurrent protection module are arranged on the input of electric main, and external AC is exported to rectification filtering module after lightning protection and overcurrent protection module.In the present embodiment; Also comprise the EMI filtration module; Be used for the EMI of input power supply is carried out filtering; The EMI filtration module is connected between lightning protection and overcurrent protection module and the rectification filtering module, and external AC is exported to the EMI filtration module after lightning protection and overcurrent protection module, after the filtering of EMI filtration module, exports to rectification filtering module.In the present embodiment, also comprise the Voltage Feedback module, the output voltage of Voltage Feedback module samples afterflow rectification filtering module, and sampled signal fed back to the PWM/OVP control module.In the utility model; Lightning protection and overcurrent protection module, EMI filtration module, rectification filtering module, main transformer die change piece, afterflow rectification filtering module, PWM/OVP control module and Voltage Feedback module can adopt the module in the routine techniques, specifically can referring to the applicant first to file about the patent aspect the Switching Power Supply or Shenzhen Moso Power Electronics Technology Co., Ltd. first to file about the patent aspect the Switching Power Supply.In the utility model, also be provided with the under-voltage protection module, the output voltage of under-voltage protection module samples rectification filtering module, and sampled result exported to the power end of PWM/OVP control module.In the present embodiment; The under-voltage protection module comprises upper offset resistance and the below-center offset resistance that is connected in series; Upper offset resistance is connected the output of rectification filtering module, and the below-center offset grounding through resistance is in the present embodiment; Because the direct voltage of input AC voltage after the rectification filtering module rectification is quite high, so upper offset resistance adopts resistance R 1, resistance R 2 and the resistance R 3 that is connected in series successively.In the present embodiment; Be connected in parallel to capacitor C 7 with below-center offset resistance, capacitor C 7 plays the High frequency filter effect, and the common port of upper offset resistance and below-center offset resistance is connected with the base stage of triode Q1 through diode D5; Wherein the positive pole of diode D5 is connected with the base stage of triode Q1; The negative pole of diode D5 links with the common port of upper offset resistance and below-center offset resistance, the grounded collector of triode Q1, and the emitter of triode Q1 is connected with the PWM/OVP control module.
The utility model in use; When the external ac commercial power voltage of input reduces; Direct voltage after the rectification filtering module rectification reduces synchronously, and the under-voltage protection module is formed voltage sample circuit by upper offset resistance R 1, resistance R 2, resistance R 3 and below-center offset resistance R 15, and the sampling voltage A of voltage sample circuit collection reduces synchronously; When sampling voltage A is lower than triode Q1 base stage; Triode Q1 base stage flows to the A point through diode D5 and constitutes the loop, this moment triode Q1 emitter and collector electrode conducting, and B point current potential is electronegative potential because of triode Q1 conducting shorted to earth drags down; The PWM/OVP control module is that electronegative potential quits work because of the operating voltage B of master chip, and power supply gets into guard mode; When input AC voltage raise, the direct voltage after the rectification filtering module rectification raise synchronously, and the under-voltage protection module is formed voltage sample circuit by upper offset resistance R 1, resistance R 2, resistance R 3 and below-center offset resistance R 15; The sampling voltage A of voltage sample circuit collection raises synchronously; When sampling voltage A was higher than triode Q1 base voltage, triode Q1 base stage was because of no bias loop, and triode Q1 work ends; This moment, triode Q1 emitter and collector electrode were open-circuit condition; B point current potential is a high potential because of triode Q1 ends, and the PWM/OVP control module is recovered operate as normal because of master chip, and power supply is normally exported; So input under-voltage protection process is accomplished in circulation.
The utility model can detect the height of the direct voltage of input AC voltage after the rectification filtering module rectification through under-voltage detection module, controls the operating voltage of PWM/OVP control module master chip again through the under-voltage protection module, thereby realizes accurate defencive function.The utility model can be through the selection of sample resistance in the under-voltage protection module; Situation according to the power supply maximal work is accurately set suitable under-voltage protection working point; Let power supply under safe condition, work always; Promptly quit work under the abnormality, thereby promote the useful life of power supply and avoid the issuable potential safety hazard of abnormity of power supply work.The circuit structure of the utility model is the basis with common circuit of reversed excitation, and is practical, and the height through automatic detection input voltage lets power supply when low-voltage is imported, stop output, operate as normal when high voltage is imported.
Claims (9)
1. power supply that adopts simple and practical input under-voltage protecting circuit; Described power supply comprises main transformer die change piece, afterflow rectification filtering module, PWM/OVP control module, and external power supply input main transformer die change piece is after main transformer die change piece carries out voltage transformation; Export to the afterflow rectification filtering module;, the afterflow rectification filtering module exports to load after being rectified into direct current, the work of PWM/OVP control module control main transformer die change piece, and it is characterized in that: described power supply also comprises the under-voltage protection module; The input voltage of under-voltage protection module samples main transformer die change piece, and sampled result exported to the power end of PWM/OVP control module.
2. the power supply of the input under-voltage protecting circuit that employing according to claim 1 is simple and practical; It is characterized in that: described under-voltage protection module comprises upper offset resistance and the below-center offset resistance that is connected in series; Upper offset resistance is connected the input of main transformer die change piece, the below-center offset grounding through resistance, and the common port of upper offset resistance and below-center offset resistance is connected with the base stage of triode Q1; The grounded collector of triode Q1, the emitter of triode Q1 is connected with the PWM/OVP control module.
3. the power supply of the input under-voltage protecting circuit that employing according to claim 2 is simple and practical is characterized in that: described upper offset resistance comprises resistance R 1, resistance R 2 and the resistance R 3 that is connected in series successively.
4. the power supply of the input under-voltage protecting circuit that employing according to claim 2 is simple and practical is characterized in that: be connected in parallel to capacitor C 7 with described below-center offset resistance.
5. the power supply of the input under-voltage protecting circuit that employing according to claim 2 is simple and practical is characterized in that: be connected with diode D5 between the common port of described upper offset resistance and below-center offset resistance and the base stage of triode Q1.
6. according to the power supply of the simple and practical input under-voltage protecting circuit of any described employing in the claim 1 to 5; It is characterized in that: described power supply also comprises rectification filtering module; External AC is exported to main transformer die change piece after the rectification filtering module rectification, the output voltage of under-voltage protection module samples rectification filtering module.
7. the power supply of the input under-voltage protecting circuit that employing according to claim 6 is simple and practical is characterized in that: described power supply also comprises lightning protection and overcurrent protection module, and external AC is exported to rectification filtering module after lightning protection and overcurrent protection module.
8. the power supply of the input under-voltage protecting circuit that employing according to claim 7 is simple and practical; It is characterized in that: described power supply also comprises the EMI filtration module; The EMI filtration module is connected between lightning protection and overcurrent protection module and the rectification filtering module; External AC is exported to the EMI filtration module after lightning protection and overcurrent protection module, after the filtering of EMI filtration module, export to rectification filtering module.
9. according to the power supply of the simple and practical input under-voltage protecting circuit of any described employing in the claim 1 to 5; It is characterized in that: described power supply also comprises the Voltage Feedback module; The output voltage of Voltage Feedback module samples afterflow rectification filtering module, and sampled signal fed back to the PWM/OVP control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203157942U CN202206124U (en) | 2011-08-26 | 2011-08-26 | Power supply adopting simple and practical input undervoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203157942U CN202206124U (en) | 2011-08-26 | 2011-08-26 | Power supply adopting simple and practical input undervoltage protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202206124U true CN202206124U (en) | 2012-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203157942U Expired - Lifetime CN202206124U (en) | 2011-08-26 | 2011-08-26 | Power supply adopting simple and practical input undervoltage protection circuit |
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| Country | Link |
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| CN (1) | CN202206124U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066820A (en) * | 2012-12-17 | 2013-04-24 | 宁波新尚智能电气有限公司 | Switching power supply |
| CN105932646A (en) * | 2016-06-16 | 2016-09-07 | 广东欧珀移动通信有限公司 | Undervoltage protection circuit and power supply |
-
2011
- 2011-08-26 CN CN2011203157942U patent/CN202206124U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066820A (en) * | 2012-12-17 | 2013-04-24 | 宁波新尚智能电气有限公司 | Switching power supply |
| CN103066820B (en) * | 2012-12-17 | 2015-02-11 | 宁波新尚智能电气有限公司 | Switching power supply |
| CN105932646A (en) * | 2016-06-16 | 2016-09-07 | 广东欧珀移动通信有限公司 | Undervoltage protection circuit and power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161026 Address after: Thai Industrial Park, 518108 Guangdong city of Shenzhen province Nanshan District Xi Bai Lu Lisong Bai mang Cun sang 1 building 7 floor Patentee after: Shenzhen Moso Power Electronics Technology Co., Ltd. Patentee after: Huizhou Maoshuo Energy Technology Co.,Ltd. Address before: Thai Industrial Park, 518108 Guangdong city of Shenzhen province Nanshan District Xi Bai Lu Lisong Bai mang Cun sang 1 building 7 floor Patentee before: Shenzhen Moso Power Electronics Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120425 |