CN105071348A - Zero-crossing protection circuit for switching power supply - Google Patents
Zero-crossing protection circuit for switching power supply Download PDFInfo
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- CN105071348A CN105071348A CN201510458811.0A CN201510458811A CN105071348A CN 105071348 A CN105071348 A CN 105071348A CN 201510458811 A CN201510458811 A CN 201510458811A CN 105071348 A CN105071348 A CN 105071348A
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Abstract
The invention discloses a zero-crossing protection circuit for a switching power supply, and includes a zero sequence detection module, a delay control module and a bidirectional silicon controlled rectifier connected on an alternating current loop. The zero sequence detection module includes a rectification circuit, a first triode and a phase inverter, an input end of the rectification circuit is connected on the alternating current loop, an output end is connected on a base electrode of the first triode, an emitting electrode of the first triode is connected on an input end of the phase inverter, the delay control module includes a 555 timing chip, an output end of the 555 timing chip is connected on a base electrode of a second triode, the first triode and the second triode form an independent electrical signal loop, a photoelectric coupler is connected in series between the first triode and the second triode, and an output end of the photoelectric coupler is connected on a control electrode of the bidirectional silicon controlled rectifier. The zero-crossing protection circuit for the switching power supply has the beneficial effect that a phenomenon that originally alternating current is directly connected and an electrical element is subjected to impact of alternating current instantaneous current can be prevented.
Description
Technical field
The present invention relates to a kind of protective circuit of Switching Power Supply, particularly the zero passage protective circuit of Switching Power Supply.
Background technology
Switching Power Supply will exchange to change into the electric component of direct current, and the quality index evaluating switching power unit is many-sided, but should be the first principle with reliability, fail safe.Sporadic failure of removal can be there is in Switching Power Supply; therefore; Switching Power Supply is under adverse circumstances and catastrophic failure situation; ensure that Switching Power Supply exports safe and reliable; the circuit of multi-protective function must be designed; make Switching Power Supply once break down, Switching Power Supply can enter guard mode or auto modification parameter automatically, makes it run under normal, a rational condition of work.
The input of Switching Power Supply is alternating current, the feature of alternating current is output polarity is positive and negative replacing, general Switching Power Supply can adopt controllable silicon as inverter element, controllable silicon belongs to the switching device that pulse signal controls conducting, when the angle of flow being input to silicon controlled trigger impulse is greater than this silicon controlled threshold value time, controllable silicon will connect circuit, the conducting when silicon controlled conducting is in crest and the trough of alternating current circuit, then can cause the moment impact of circuit, cause the damage of electric component.
Summary of the invention
The object of this invention is to provide a kind of zero passage protective circuit preventing Switching Power Supply moment impact from causing Switching Power Supply internal electronic device to damage,
For achieving the above object, the scheme that the application provides is: Switching Power Supply zero passage protective circuit, comprise zero sequence detection module, delays time to control module and the bidirectional triode thyristor be connected on ac circuit, described zero sequence detection module comprises rectification circuit, first triode and inverter, the input of described rectification circuit is connected on ac circuit, output is connected in the base stage of the first triode, the emitter of the first triode is connected to the input of inverter, described delays time to control module comprises 555 timing chips, the output of described inverter is connected to the trigger end of 555 timing chips, the control voltage end of 555 timing chips is connected with delay circuit, the thresholding end of 555 timing chips is connected with timing cycle circuit, the output of described 555 timing chips is connected in the base stage of the second triode, described first triode and the second triode form separate electric signals loop, to connect between first triode and the second triode a photoelectrical coupler, the control that the output of described photoelectrical coupler is connected to bidirectional triode thyristor is extremely gone up.
The principle and advantage of this Switching Power Supply zero passage protective circuit is: when Switching Power Supply is connected on ac circuit for the first time; first by rectification circuit, interchange is become half-wave current in the same way; continuous print half-wave current enters into the first triode and flows through inverter again; by 555 timing chips, delay circuit and the timing cycle peripheral circuit as 555 timing chip work, the cycle can be changed by the voltage signal changed in timing cycle circuit.If half-wave current is in the zero phase-sequence at alternately place, inverter be input as low level, so be input in 555 timing chips is high level, the output of 555 timing chips will export high level signal, second triode conducting, makes the first triode and the second triode form the conducting of separate electric signals loop, after this loop conducting, the photoelectrical coupler being in this loop sends pulse signal, thus conducting bidirectional triode thyristor; Make the conducting from zero phase-sequence of the output current of ac circuit.If instead when just having started to be linked into alternating current, current signal is near the larger crest of amplitude and trough, the input of inverter is high level, the level so entering into 555 timing chips is then low level, now cannot give bidirectional triode thyristor triggering signal, then alternating current circuit can not in the stronger time conducting of electric current; The electronic device that this avoid Switching Power Supply is subject to the heavy current impact of moment.
Further, shunt capacitance is parallel with between the first anode of described bidirectional triode thyristor and second plate; The high-frequency noise produced in energy filtering bidirectional triode thyristor, improves the operating efficiency of this device.
Further, voltage stabilizing circuit is provided with between the power end of described 555 timing chips and rectification circuit, described voltage stabilizing circuit comprises voltage stabilizing chip, the input of voltage stabilizing chip is connected on rectification circuit output end, the output of voltage stabilizing chip is connected on the grid of field effect transistor, and field effect transistor is as the switching device between rectification circuit and the power end of described 555 timing chips.Because the amplitude of alternating current is also unstable; usually exceed the safe amplitude of alternating current; in order to the electronic device in protective circuit; by voltage stabilizing chip, output voltage amplitude is judged; if be greater than the safe voltage amplitude of electronic device; voltage stabilizing chip controls, by the voltage swing of field effect transistor, makes the input voltage of input 555 timing chip be in stability range.
Finally, described field effect transistor grid and drain electrode between a voltage stabilizing didoe in parallel; Ensure that the voltage between the grid of field effect transistor and drain electrode maintains the rated value of voltage stabilizing didoe by zener diode, the stability of the guarantee output voltage of further field effect transistor.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Switching Power Supply zero passage protective circuit in the embodiment of the present invention.
Embodiment
Below by embodiment, the present invention is further detailed explanation:
Embodiment Switching Power Supply zero passage protective circuit substantially as shown in Figure 1; the bidirectional triode thyristor comprising zero sequence detection module, delays time to control module and be connected on ac circuit; zero sequence detection module includes rectification circuit, the first triode Q1 and inverter ic 1; the input of rectification circuit is connected on ac circuit; output is connected in the base stage of the first triode Q1; the emitter of the first triode Q1 is connected to the input of inverter ic 1; delays time to control module comprises 555 timing chips, and 555 timing chips include 8 pins
The function of each pin is respectively: 1 pin: external power supply negative terminal VSS or ground connection, generally ground connection.2 pin: low triggering end.3 pin: output end vo.4 pin: be direct clear terminal; When this termination low level, then time-base circuit does not work, no matter now what level TR, TH are in, time-base circuit exports as " 0 ", and the used time should not connect high level to this end.5 pin: VC is control voltage end; If this end external voltage, then can change the reference voltage of inner two comparators, when this end not used time, this end should be sealed in a 0.01 μ F capacity earth, in case introduce interference.6 pin: thresholding end is also high-triggering end.7 pin: discharge end.This end is connected with discharge tube collector electrode, is used as the electric discharge of electric capacity during timer.8 pin: the scope of external power supply VCC, bipolar time-base circuits VCC is the scope of 4.5 ~ 16V, CMOS type time-base circuit VCC is 3 ~ 18V, generally uses 5V.
The output of inverter ic 2 is connected on 2 pin of 555 timing chips, and 5 pin of 555 timing chips are connected with delay circuit, and delay circuit has resistance R2 series connection C2, and is linked into by C2 on 1 pin; 6 pin of 555 timing chips are connected with timing cycle circuit, and timing cycle circuit is that connect an electric capacity C2 being linked into by C2 on 7 pin of conditioned circuit R1 is formed; Output 3 pin of 555 timing chips is connected in the base stage of the second triode Q2, first triode Q1 and the second triode Q2 forms separate electric signals loop, the control that the output of a photoelectrical coupler MOC3021, photoelectrical coupler MOC3021 of connecting between first triode Q1 and the second triode Q2 is connected to bidirectional triode thyristor SCR is extremely gone up.
Be provided with voltage stabilizing circuit between the power end of 555 timing chips and rectification circuit, voltage stabilizing circuit comprises voltage stabilizing chip max6495, and MAX6495 voltage stabilizing chip is over-voltage protector, for the protection of subsequent conditioning circuit from the destruction of getting rid of load or instantaneous pressure.Device realizes by controlling external series n channel mosfet on the power line.When voltage exceedes the Overpressure door of user's setting in limited time, drag down the grid of MOSFET, MOSFET turns off, and disconnects the relay switch K1 in alternating current circuit simultaneously, thus load is disconnected from input power.
A voltage stabilizing didoe VD1 in parallel between the grid of field effect transistor Q3 and drain electrode; Ensure that the voltage between the grid of field effect transistor Q3 and drain electrode maintains the rated value of voltage stabilizing didoe VD1 by zener diode VD1, ensure the stability of output voltage.
Above-described is only embodiments of the invention, and in scheme, the general knowledge such as known concrete structure and characteristic does not do too much description at this.Should be understood that; for a person skilled in the art, under the prerequisite not departing from structure of the present invention, some distortion and improvement can also be made; these also should be considered as protection scope of the present invention, and these all can not affect effect of the invention process and practical applicability.The protection range that this application claims should be as the criterion with the content of its claim, and the embodiment in specification etc. record the content that may be used for explaining claim.
Claims (4)
1. Switching Power Supply zero passage protective circuit, comprise zero sequence detection module, delays time to control module and the bidirectional triode thyristor be connected on ac circuit, described zero sequence detection module comprises rectification circuit, first triode and inverter, the input of described rectification circuit is connected on ac circuit, output is connected in the base stage of the first triode, the emitter of the first triode is connected to the input of inverter, described delays time to control module comprises 555 timing chips, it is characterized in that, the output of described inverter is connected to the trigger end of 555 timing chips, the control voltage end of 555 timing chips is connected with delay circuit, the thresholding end of 555 timing chips is connected with timing cycle circuit, the output of described 555 timing chips is connected in the base stage of the second triode, described first triode and the second triode form separate electric signals loop, to connect between first triode and the second triode a photoelectrical coupler, the control that the output of described photoelectrical coupler is connected to bidirectional triode thyristor is extremely gone up.
2. Switching Power Supply zero passage protective circuit according to claim 1, is characterized in that: be parallel with shunt capacitance between the first anode of described bidirectional triode thyristor and second plate.
3. Switching Power Supply zero passage protective circuit according to claim 2; it is characterized in that: between the power end of 555 timing chips and rectification circuit, be provided with voltage stabilizing circuit; described voltage stabilizing circuit comprises voltage stabilizing chip; the input of voltage stabilizing chip is connected on rectification circuit output end; the output of voltage stabilizing chip is connected on the grid of field effect transistor, and field effect transistor is as the switching device between rectification circuit and the power end of described 555 timing chips.
4. Switching Power Supply zero passage protective circuit according to claim 3, is characterized in that: a voltage stabilizing didoe in parallel between the grid of described field effect transistor and drain electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510458811.0A CN105071348A (en) | 2015-07-31 | 2015-07-31 | Zero-crossing protection circuit for switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510458811.0A CN105071348A (en) | 2015-07-31 | 2015-07-31 | Zero-crossing protection circuit for switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN105071348A true CN105071348A (en) | 2015-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510458811.0A Pending CN105071348A (en) | 2015-07-31 | 2015-07-31 | Zero-crossing protection circuit for switching power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289597A (en) * | 2019-07-25 | 2019-09-27 | 西安霍威电源有限公司 | A kind of power module and its protection circuit |
| CN111564826A (en) * | 2020-05-12 | 2020-08-21 | 中国科学院上海光学精密机械研究所 | Dual-protection circuit for atomic chip |
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| JPH11271366A (en) * | 1998-03-19 | 1999-10-08 | Sony Corp | Apparatus for detecting voltage drop |
| CN101534005A (en) * | 2009-04-09 | 2009-09-16 | 哈尔滨工业大学 | Suppressing circuit of power-on impact current |
| CN203617981U (en) * | 2013-12-18 | 2014-05-28 | 天津光电惠高电子有限公司 | Power delay starting switch |
| CN204046129U (en) * | 2014-05-15 | 2014-12-24 | 浙江海洋学院 | A kind of refrigerator protector |
| CN204886145U (en) * | 2015-07-31 | 2015-12-16 | 重庆市志益鑫电子科技有限公司 | Switching power supply zero passage protection circuit |
-
2015
- 2015-07-31 CN CN201510458811.0A patent/CN105071348A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11271366A (en) * | 1998-03-19 | 1999-10-08 | Sony Corp | Apparatus for detecting voltage drop |
| CN101534005A (en) * | 2009-04-09 | 2009-09-16 | 哈尔滨工业大学 | Suppressing circuit of power-on impact current |
| CN203617981U (en) * | 2013-12-18 | 2014-05-28 | 天津光电惠高电子有限公司 | Power delay starting switch |
| CN204046129U (en) * | 2014-05-15 | 2014-12-24 | 浙江海洋学院 | A kind of refrigerator protector |
| CN204886145U (en) * | 2015-07-31 | 2015-12-16 | 重庆市志益鑫电子科技有限公司 | Switching power supply zero passage protection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289597A (en) * | 2019-07-25 | 2019-09-27 | 西安霍威电源有限公司 | A kind of power module and its protection circuit |
| CN111564826A (en) * | 2020-05-12 | 2020-08-21 | 中国科学院上海光学精密机械研究所 | Dual-protection circuit for atomic chip |
| CN111564826B (en) * | 2020-05-12 | 2022-06-28 | 中国科学院上海光学精密机械研究所 | Dual protection circuit for atomic chip |
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Application publication date: 20151118 |