CN205265238U - Fast protection circuit of switching power supply - Google Patents
Fast protection circuit of switching power supply Download PDFInfo
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- CN205265238U CN205265238U CN201521008376.3U CN201521008376U CN205265238U CN 205265238 U CN205265238 U CN 205265238U CN 201521008376 U CN201521008376 U CN 201521008376U CN 205265238 U CN205265238 U CN 205265238U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 5
- 238000003708 edge detection Methods 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 230000001052 transient effect Effects 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
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Abstract
The utility model discloses a fast protection circuit of a switch power supply, which generates an interrupt signal to indicate the switch power supply to be closed, and comprises a commercial power detection circuit for sampling commercial power, a signal conversion circuit for converting a commercial power sampling voltage signal output by the commercial power detection circuit into a forward sine wave from a positive sine wave and a negative sine wave, a square wave generation circuit for converting the forward sine wave signal of the commercial power into a square wave synchronously related to the commercial power, and an interrupt identification circuit for carrying out edge detection on the square wave output by the square wave generation circuit; the interrupt identification circuit generates an interrupt signal to be connected with the control end of the switching power supply when no square wave is detected in a set time period. Because the interrupt recognition detects the square wave signal synchronous with the mains supply, when the mains supply has voltage transient, even if a sine half wave falls off, an edge is lost on the interrupt recognition, and the switch-off is considered to be abnormal. A fast response of the anomaly is achieved.
Description
Technical field
The utility model relates to the fast protection circuit field of Switching Power Supply.
Background technology
In current application, Switching Power Supply is with the linear stabilized power supply before the comprehensive replacement of its absolute performance advantage. But Switching Power Supply applied environment complexity, some inclement conditions, in the time having unpredictable unexpected generation, can quick closedown, quit work and guarantee that self does not damage. Holding circuit can be predicted fast and respond is successfully crucial.
At present, the protection of Switching Power Supply input is general to be used input commercial power rectification, filtering, and by potential-divider network dividing potential drop, the way of transport and placing device comparison, when too low, the too high corresponding comparator output corresponding signal of input voltage, closes output. But this peak value type detects the problem both ways of depositing:
1, in actual application environment, be good at mostly being non-resistive load, load current all occurs in sinusoidal wave summit position, causes sinusoidal wave rugged change, and when virtual value is identical, peak value is not identical. Make to detect and have very large deviation.
2,, in the time of input voltage transition, the peak value smoothing capacity that holding circuit is used because there is filtering, can't detect falling of voltage and can not protect. Find in actual applications, have preposition boost function (PFC) power supply because correcting the bandwidth reasons of 50Hz, there is serious voltage overshoot and damage.
Utility model content
The purpose of this utility model is to provide a kind of fast protection circuit, solution be because of testing circuit can not accurately detect and fast response, cause Switching Power Supply damage technical problem.
The technical solution adopted in the present invention is: a kind of fast protection circuit of Switching Power Supply, produce interrupt signal indicator cock power-off, comprise that city's power detection circuit that civil power is sampled, the civil power sampling voltage signal that city's power detection circuit is exported are converted to the signal conversion circuit of forward sine wave, the signal of the forward sine wave of civil power are transformed into the interrupt sensing circuit that carries out edge detection with the square wave generation circuit of civil power sync correlation square wave, to the square wave of square wave generation circuit output by positive negative sense sine wave; Described interrupt sensing circuit produces interrupt signal and is connected with the control end of described Switching Power Supply square wave do not detected in setting-up time section time.
Because what interrupt recognition detection is the square-wave signal of synchronizeing with civil power, though in the time there is voltage transient in civil power the falling an of half-sinusoid, in the loss of interrupting just having in identification an edge, think to have occurred abnormal and close. Realize abnormal quick response.
Further; in the fast protection circuit of above-mentioned Switching Power Supply: also comprise A/D convertor circuit, digital comparison module; reference value setting module; the input end of analog signal of described A/D convertor circuit connects one end of described signal conversion circuit output forward sine wave; the digital signal output end of described A/D convertor circuit is connected with an input of digital comparison module; reference value setting module output is connected with another input of described digital comparison module, and described digital comparison module is connected with the control end of described Switching Power Supply.
Further, in the fast protection circuit of above-mentioned Switching Power Supply: described signal conversion circuit is full-wave rectifying circuit, comprise the full-wave bridge being formed by diode D3, diode D4, diode D5 and diode D6.
Further, in the fast protection circuit of above-mentioned Switching Power Supply: described square wave generation circuit comprises the first resistance, the first electric capacity, diode D1; One end of the first described resistance is connected with the output of described full-wave bridge, the other end is connected with one end of described the first electric capacity, the negative electrode of another terminating diode D1 of the first described electric capacity, the plus earth of diode D1, the square-wave signal of the negative electrode output of described diode D1 connects described interrupt sensing circuit. The first described resistance is made up of resistance R 1 and resistance R 2 series windings, and the first described electric capacity is made up of capacitor C 1 and capacitor C 2 series windings.
Further; in the fast protection circuit of above-mentioned Switching Power Supply: the input end of analog signal of described A/D convertor circuit is also provided with sample circuit; described sample circuit comprises the second resistance and the 3rd resistance of series winding; second described resistance one end is connected with the output of described full-wave bridge; one end ground connection of the 3rd resistance, the output that the link of the second resistance and the 3rd resistance is sample circuit connects the input end of analog signal of described A/D convertor circuit. The second described resistance is resistance R 1, resistance R 2 and resistance R 3 series winding compositions.
Because voltage detecting is sampled as instantaneous value according to mathematical formulae, comprehensive through what repeatedly sample, the variation of sinusoidal wave peak value there is not impact substantially on test result, and the sine wave of distortion also can obtain correct virtual value, has realized accurate voltage identification.
Below with reference to drawings and Examples, the present invention is described in detail.
Brief description of the drawings
Fig. 1 is module map of the present utility model.
Fig. 2 is schematic diagram of the present utility model.
Detailed description of the invention
Embodiment 1, as shown in Figure 1 and Figure 2, the present embodiment is that a kind of control signal gauge tap power-off that can produce fast in the time detecting that civil power is undesired is to carry out the Switching Power Supply fast protection circuit of protection fast to Switching Power Supply.
A kind of fast protection circuit comprises: comprise that city's power detection circuit that civil power is sampled, the civil power sampling voltage signal that city's testing circuit is exported are converted to the signal conversion circuit of forward sine wave, the signal of the forward sine wave in city are transformed into the interrupt sensing circuit that carries out edge detection with the square wave generation circuit of civil power sync correlation square wave, to the square wave of square wave generation circuit output by positive negative sense sine wave; Interrupt sensing circuit produces interrupt signal and is connected with the control end of Switching Power Supply square wave do not detected in setting-up time section time. In addition, also have A/D convertor circuit, digital comparison module, reference value setting module, the input end of analog signal of A/D convertor circuit connects one end of signal conversion circuit output forward sine wave, the digital signal output end of A/D convertor circuit is connected with an input of digital comparison module, reference value setting module output is connected with another input of digital comparison module, and the control end of the Switching Power Supply described in digital comparison module is connected.
Line voltage input is converted to forward sine wave through signal conversion circuit by positive negative sense sine wave, facilitates late-class circuit to detect. Signal is transformed to interrupt identifying provides civil power synchronous square-wave signal; For A/D convertor circuit detects the forward sine wave signal that low-voltage amplitude is provided.
As shown in Figure 2, the signal conversion circuit in the present embodiment is the full-wave bridge being made up of diode D3, diode D4, diode D5 and diode D6 full-wave rectifying circuit. The alternating current of 220V sine wave is converted to forward sine wave by full-wave bridge, facilitates late-class circuit to detect. Square wave generation circuit is made up of resistance R 1, resistance R 2 and capacitor C 1, capacitor C 2 and diode D1, provides civil power synchronous square-wave signal for interrupting identification division. R3, R4 composition potential-divider network provides the forward sine wave signal of low-voltage amplitude for A/D convertor circuit, and it is exactly the Acquisition Circuit of A/D convertor circuit.
IC1 is an integrated circuit, integrated interrupt sensing circuit, A/D convertor circuit, digital comparison module, reference value setting module in integrated circuit. Wherein, the voltage signal that A/D convertor circuit utilizes the potential-divider network collection of resistance R 1, R2, R3, R4 composition to be directly proportional to civil power, through the instantaneous voltage signal (being denoted as S1, S2, Sn) repeatedly uniformly-spaced gathering, be S1 for the first time, be S2 for the second time, be for the N time Sn, (repeatedly uniformly-spaced gathering the meaning is must be greater than sine wave period on the time before Sn calculating, so will uniformly-spaced); Send mathematical computations to pass throughAccount form, obtains input voltage value accurately; Numeral comparison module part utilizes result of calculation to set and compare with reference value; Execution driven is according to comparative result, and when abnormal, output current signal is closed output. Described interruption identification division detects the variation edge with civil power sync correlation square wave, in the time having edge to lose, means and has voltage to fall, and notice Execution driven part, from SHUT output shutdown signal.
The beneficial effects of the utility model are:
Because what interrupt recognition detection is the square-wave signal of synchronizeing with civil power, though in the time there is voltage transient in civil power the falling an of half-sinusoid, in the loss of interrupting just having in identification an edge, think to have occurred abnormal and close. Realize abnormal quick response.
Because voltage detecting is sampled as instantaneous value according to mathematical formulae, comprehensive through what repeatedly sample, the variation of sinusoidal wave peak value there is not impact substantially on test result, and the sine wave of distortion also can obtain correct virtual value, has realized accurate voltage identification.
Claims (7)
1. the fast protection circuit of a Switching Power Supply, produce interrupt signal indicator cock power-off, it is characterized in that: comprise that city's power detection circuit that civil power is sampled, the civil power sampling voltage signal that city's power detection circuit is exported are converted to the signal conversion circuit of forward sine wave, the signal of the forward sine wave of civil power are transformed into the interrupt sensing circuit that carries out edge detection with the square wave generation circuit of civil power sync correlation square wave, to the square wave of square wave generation circuit output by positive negative sense sine wave; Described interrupt sensing circuit produces interrupt signal and is connected with the control end of described Switching Power Supply square wave do not detected in setting-up time section time.
2. the fast protection circuit of Switching Power Supply according to claim 1, it is characterized in that: also comprise A/D convertor circuit, numeral comparison module, reference value setting module, the input end of analog signal of described A/D convertor circuit connects one end of described signal conversion circuit output forward sine wave, the digital signal output end of described A/D convertor circuit is connected with an input of digital comparison module, reference value setting module output is connected with another input of described digital comparison module, described digital comparison module is connected with the control end of described Switching Power Supply.
3. the fast protection circuit of Switching Power Supply according to claim 2, is characterized in that: described signal conversion circuit is full-wave rectifying circuit, comprises the full-wave bridge being made up of diode D3, diode D4, diode D5 and diode D6.
4. the fast protection circuit of Switching Power Supply according to claim 3, is characterized in that: described square wave generation circuit comprises the first resistance, the first electric capacity, diode D1; One end of the first described resistance is connected with the output of described full-wave bridge, the other end is connected with one end of described the first electric capacity, the negative electrode of another terminating diode D1 of the first described electric capacity, the plus earth of diode D1, the square-wave signal of the negative electrode output of described diode D1 connects described interrupt sensing circuit.
5. the fast protection circuit of Switching Power Supply according to claim 4, is characterized in that: the first described resistance is made up of resistance R 1 and resistance R 2 series windings, and the first described electric capacity is made up of capacitor C 1 and capacitor C 2 series windings.
6. the fast protection circuit of Switching Power Supply according to claim 3; it is characterized in that: the input end of analog signal of described A/D convertor circuit is also provided with sample circuit; described sample circuit comprises the second resistance and the 3rd resistance of series winding; second described resistance one end is connected with the output of described full-wave bridge; one end ground connection of the 3rd resistance, the output that the link of the second resistance and the 3rd resistance is sample circuit connects the input end of analog signal of described A/D convertor circuit.
7. the fast protection circuit of Switching Power Supply according to claim 6, is characterized in that: the second described resistance is resistance R 1, resistance R 2 and resistance R 3 series winding compositions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521008376.3U CN205265238U (en) | 2015-12-08 | 2015-12-08 | Fast protection circuit of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521008376.3U CN205265238U (en) | 2015-12-08 | 2015-12-08 | Fast protection circuit of switching power supply |
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| Publication Number | Publication Date |
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| CN205265238U true CN205265238U (en) | 2016-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521008376.3U Active CN205265238U (en) | 2015-12-08 | 2015-12-08 | Fast protection circuit of switching power supply |
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| CN (1) | CN205265238U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106972466A (en) * | 2017-03-01 | 2017-07-21 | 昆山龙腾光电有限公司 | Power control and method |
| CN110095648A (en) * | 2019-04-15 | 2019-08-06 | 深圳市致宸信息科技有限公司 | A kind of LLC Topology Switch power input power detection device and method |
| CN115664204A (en) * | 2022-12-22 | 2023-01-31 | 珠海智融科技股份有限公司 | Switching power supply circuit, power supply device and switching power supply control method |
| CN115765146A (en) * | 2023-01-10 | 2023-03-07 | 深圳榕亨实业集团有限公司 | Standby power supply control system and control method |
-
2015
- 2015-12-08 CN CN201521008376.3U patent/CN205265238U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106972466A (en) * | 2017-03-01 | 2017-07-21 | 昆山龙腾光电有限公司 | Power control and method |
| CN110095648A (en) * | 2019-04-15 | 2019-08-06 | 深圳市致宸信息科技有限公司 | A kind of LLC Topology Switch power input power detection device and method |
| CN115664204A (en) * | 2022-12-22 | 2023-01-31 | 珠海智融科技股份有限公司 | Switching power supply circuit, power supply device and switching power supply control method |
| CN115664204B (en) * | 2022-12-22 | 2023-04-07 | 珠海智融科技股份有限公司 | Switching power supply circuit, power supply device and switching power supply control method |
| CN115765146A (en) * | 2023-01-10 | 2023-03-07 | 深圳榕亨实业集团有限公司 | Standby power supply control system and control method |
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| C14 | Grant of patent or utility model | ||
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Address after: 518000 Guangdong Shenzhen Pingshan New Area Industrial Zone Julongshan District Jinweiyuan Industrial Plant Area A Building 2 Floor North District, B2 Building 6 Floor Patentee after: Shenzhen Techone Tech. Co., Ltd. Address before: 518000 Guangdong Province Shenzhen Pingshan New Area Industrial Zone Julongshan District Jinweiyuan Industrial Plant Area A Building 2 Floor North, B2 Building 6 Floor Patentee before: Shenzhen Techone Tech. Co., Ltd. |