CN103904874A - Delay soft start circuit used for BOOST-PFC - Google Patents
Delay soft start circuit used for BOOST-PFC Download PDFInfo
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- CN103904874A CN103904874A CN201410088978.8A CN201410088978A CN103904874A CN 103904874 A CN103904874 A CN 103904874A CN 201410088978 A CN201410088978 A CN 201410088978A CN 103904874 A CN103904874 A CN 103904874A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention relates to a delay soft start circuit used for a BOOST-PFC. On the basis of the background technology, a drive delay circuit and a startup and shutdown control end are additionally arranged, a relay is closed and delayed and then starts to drive, normal output of the BOOST-PFC is achieved, and after the BOOST-PFC shuts down, drive of the soft start relay and a chip is stopped. The relay is closed, then the chip is controlled to drive after a certain time delay, and a soft start resistor is not overheated.
Description
Technical field
The present invention relates to a kind of time-delay soft start circuit for BOOST-PFC.
Background technology
BOOST-PFC circuit is in the time starting, need first bus to be charged, owing to there being large electric capacity on bus, when startup, can produce very large rush of current, may cause transistorized puncturing, thus to have soft starting circuit by the current limit of capacitor charging in the scope of a requirement.
Existing soft starting circuit comprises control relay circuit and hysteresis circuit, and as shown in Figure 1, input voltage VIN is charged to bus capacitor by soft start resistance R 7.V_SS is busbar voltage detection signal.When start, when busbar voltage reaches after preset value, V_SS voltage reaches 2.5V, now the negative electrode of U1 is for to become low level from high level, and the base stage of Q1 becomes low level from high level, makes the emitter and collector two ends conducting of Q1, the coil of relay obtains electric, relay closes.Due to relay not closed time control chip just have to drive and produce, generate on soft start resistance and have large electric current to pass through, can cause easily overheated burning of soft start resistance.When shutdown, because first output cut off load, on bus, voltage drop is slow, if auxiliary electricity from bus power taking, can make auxiliary electricity work on a period of time, relay is adhesive always, while startup, can make next time soft starting circuit lose efficacy, the phenomenon of diode breakdown can cause the frequent switching on and shutting down of APFC time.
Summary of the invention
The object of this invention is to provide a kind of time-delay soft start circuit for BOOST-PFC, the problem that the large electric current while start in order to solve burns soft start resistance, further, can not disconnect the problem of soft start relay and chip drives can also solve shutdown time.
For achieving the above object, the solution of the present invention comprises:
For a time-delay soft start circuit of BOOST-PFC, in relay drive terminal (Q1 collector electrode), be provided with a delay driving circuit, delay driving circuit is for connecting the soft start pin (SS) of control chip; Delay driving circuit comprises a charging circuit and a comparator, and charging circuit connects an input of comparator, and comparator output terminal connects the soft start pin (SS) of described control chip.
Before charging circuit charging reaches setting voltage value, comparator is not exported, and makes to start after relay closes time delay to drive, and realizes the normal output of BOOST-PFC.
Further, on busbar voltage detection signal terminal (V_SS), be connected with switching on and shutting down control end (ON_OFF_CTR).Can control switch relay and the driving of control chip by this switching on and shutting down control end.
Further, described charging circuit is RC charging circuit, and electric capacity is in series with a resistor, and series connection point connects the in-phase input end of described comparator, the reverse inter-input-ing ending grounding of comparator.
Further, between described switching on and shutting down control end (ON_OFF_CTR) and busbar voltage detection signal terminal (V_SS), be provided with backward diode (D1).
Between the soft start pin (SS) of control chip and the output of described comparator, be connected with backward diode (D5).
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of prior art;
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
A kind of time delay controllable soft start circuit for BOOST-PFC as shown in Figure 2, input voltage VIN is charged to bus capacitor by soft start resistance R 7.The part that this circuit is identical with background technology does not repeat them here.
In order to make to start to drive after relay closes time delay, realize the normal output of BOOST-PFC, in relay drive terminal (Q1 collector electrode), be provided with a delay driving circuit as shown in Figure 2, delay driving circuit is for connecting the soft start pin SS of control chip; Delay driving circuit comprises a charging circuit and a comparator, and charging circuit connects an input of comparator, and comparator output terminal connects the soft start pin SS of control chip.
When start, the coil of relay obtains when electric, relay closes, and electric current flows through from Q1, D1, R2, R1, and V_SS is divided the voltage of 6V, has guaranteed that relay can not shake disconnection.Meanwhile, electric current is C2 in charging circuit charging by R5, in the time that the level of the 3rd pin of U2A is greater than the 2nd pin, the output of amplifier U2A the 1st pin is high level, SS connects the soft start pin of control chip, and chip starts driving, and the value of adjusting R5 and C2 can arrange the length of delay time.Amplifier U2A and peripheral circuit thereof have formed a comparator.
Drive shutoff simultaneously in order to realize relay and control chip.On busbar voltage detection signal terminal V_SS, be connected with switching on and shutting down control end ON_OFF_CTR.When start, ON_OFF_CTR is high level.
When shutdown, ON_OFF_CTR signal is low level, make the negative electrode of U1 be high level, Q1 turn-offs, and relay disconnects, C2 is by D2, D1, R2, R1 electric discharge simultaneously, in the time that the level of the 3rd pin of U2A is less than the 2nd pin, its output the 1st pin is low level, by diode D5, make SS pin always for low, control chip is without driver output.
More than provide a kind of concrete execution mode, but the present invention is not limited to described execution mode.Basic ideas of the present invention are such scheme, and for those of ordinary skills, according to instruction of the present invention, structure, the parameter of designing various distortion do not need to spend creative work.Variation, modification, replacement and the modification of without departing from the principles and spirit of the present invention execution mode being carried out still fall within the scope of protection of the present invention.
Claims (5)
1. for a time-delay soft start circuit of BOOST-PFC, it is characterized in that, in relay drive terminal (Q1 collector electrode), be provided with a delay driving circuit, delay driving circuit is for connecting the soft start pin (SS) of control chip; Delay driving circuit comprises a charging circuit and a comparator, and charging circuit connects an input of comparator, and comparator output terminal connects the soft start pin (SS) of described control chip.
2. a kind of time-delay soft start circuit for BOOST-PFC according to claim 1, is characterized in that, is connected with switching on and shutting down control end (ON_OFF_CTR) on busbar voltage detection signal terminal (V_SS).
3. a kind of time-delay soft start circuit for BOOST-PFC according to claim 1, it is characterized in that, described charging circuit is RC charging circuit, and electric capacity is in series with a resistor, series connection point connects the in-phase input end of described comparator, the reverse inter-input-ing ending grounding of comparator.
4. a kind of time-delay soft start circuit for BOOST-PFC according to claim 1, is characterized in that, between described switching on and shutting down control end (ON_OFF_CTR) and busbar voltage detection signal terminal (V_SS), is provided with backward diode.
5. a kind of time-delay soft start circuit for BOOST-PFC according to claim 3, is characterized in that, between the soft start pin (SS) of control chip and the output of described comparator, is connected with backward diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410088978.8A CN103904874B (en) | 2014-03-11 | 2014-03-11 | A kind of time-delay soft start circuit for BOOST-PFC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410088978.8A CN103904874B (en) | 2014-03-11 | 2014-03-11 | A kind of time-delay soft start circuit for BOOST-PFC |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103904874A true CN103904874A (en) | 2014-07-02 |
| CN103904874B CN103904874B (en) | 2018-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410088978.8A Active CN103904874B (en) | 2014-03-11 | 2014-03-11 | A kind of time-delay soft start circuit for BOOST-PFC |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553245A (en) * | 2015-09-10 | 2016-05-04 | 许继电源有限公司 | Soft start circuit |
| CN109067161A (en) * | 2018-08-09 | 2018-12-21 | 中国铁道科学研究院集团有限公司 | A kind of power safety activation system |
| CN111785569A (en) * | 2020-06-29 | 2020-10-16 | 佛山科学技术学院 | Soft-start relay control circuit and charging circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6100677A (en) * | 1999-10-18 | 2000-08-08 | National Semiconductor Corporation | Switching controller chip with internal but not external soft start circuitry and DC to DC converter including such a controller chip |
| CN1653863A (en) * | 2002-09-12 | 2005-08-10 | 松下电器产业株式会社 | Lighting device of electrodeless discharge lamp, bulb type electrodeless fluorescent lamp and lighting device of discharge lamp |
| CN201608646U (en) * | 2010-02-08 | 2010-10-13 | 南京国睿新能电子有限公司 | Soft-start boost circuit based on UC384X |
| CN103427618A (en) * | 2013-06-24 | 2013-12-04 | 深圳市英威腾电气股份有限公司 | Soft start control circuit |
| CN203851016U (en) * | 2014-03-11 | 2014-09-24 | 许继电气股份有限公司 | A time-delay soft start circuit used for BOOST-PFC |
-
2014
- 2014-03-11 CN CN201410088978.8A patent/CN103904874B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6100677A (en) * | 1999-10-18 | 2000-08-08 | National Semiconductor Corporation | Switching controller chip with internal but not external soft start circuitry and DC to DC converter including such a controller chip |
| CN1653863A (en) * | 2002-09-12 | 2005-08-10 | 松下电器产业株式会社 | Lighting device of electrodeless discharge lamp, bulb type electrodeless fluorescent lamp and lighting device of discharge lamp |
| CN201608646U (en) * | 2010-02-08 | 2010-10-13 | 南京国睿新能电子有限公司 | Soft-start boost circuit based on UC384X |
| CN103427618A (en) * | 2013-06-24 | 2013-12-04 | 深圳市英威腾电气股份有限公司 | Soft start control circuit |
| CN203851016U (en) * | 2014-03-11 | 2014-09-24 | 许继电气股份有限公司 | A time-delay soft start circuit used for BOOST-PFC |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553245A (en) * | 2015-09-10 | 2016-05-04 | 许继电源有限公司 | Soft start circuit |
| CN109067161A (en) * | 2018-08-09 | 2018-12-21 | 中国铁道科学研究院集团有限公司 | A kind of power safety activation system |
| CN111785569A (en) * | 2020-06-29 | 2020-10-16 | 佛山科学技术学院 | Soft-start relay control circuit and charging circuit |
| CN111785569B (en) * | 2020-06-29 | 2022-07-15 | 佛山科学技术学院 | Soft-start relay control circuit and charging circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103904874B (en) | 2018-04-24 |
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