CN103904874B - A kind of time-delay soft start circuit for BOOST-PFC - Google Patents
A kind of time-delay soft start circuit for BOOST-PFC Download PDFInfo
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- CN103904874B CN103904874B CN201410088978.8A CN201410088978A CN103904874B CN 103904874 B CN103904874 B CN 103904874B CN 201410088978 A CN201410088978 A CN 201410088978A CN 103904874 B CN103904874 B CN 103904874B
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- soft start
- circuit
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- boost
- comparator
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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 present invention relates to a kind of time-delay soft start circuit for BOOST PFC, driving delay circuit and switching on and shutting down control terminal are added on the basis of background technology, start to drive after relay closes and is delayed, realize the normal output of BOOST PFC, the driving of soft start relay and chip is closed after shutdown.Control chip is just set to go out driving when relay is delayed certain after closing, soft start resistance will not overheat.
Description
Technical field
The present invention relates to a kind of time-delay soft start circuit for BOOST-PFC.
Background technology
BOOST-PFC circuits are on startup, it is necessary to first charge busbar, due to there is bulky capacitor on busbar, during startup
Very big rush of current can be produced, it is likely to result in the breakdown of transistor, so there is soft starting circuit to charge to capacitance
Current limit is in the range of one requires.
Existing soft starting circuit includes control relay circuit and hysteresis circuit, as shown in Figure 1, input voltage VIN is led to
Soft start resistance R7 is crossed to charge to bus capacitor.V_SS is busbar voltage detection signal.During start, when busbar voltage reaches default
After value, V_SS voltages reach 2.5V, and the cathode of U1 is to be changed into low level from high level at this time, and the base stage of Q1 is changed into low from high level
Level so that the emitter and collector both ends conducting of Q1, the coil of relay obtain electric, relay closure.Due to relay not
Control chip just has driving and produces when closure, and generating has high current by the way that soft start can be caused electric on soft start resistance
Capacitance-resistance easily overheat is burnt.During shutdown, since output has been first turned off load, it is slow that busbar powers on drops, if auxiliary electricity is from mother
Line takes electricity, and auxiliary electricity can be made to work on a period of time, and relay is attracted always, and next time can make soft starting circuit fail when starting,
The phenomenon of diode breakdown when can cause the APFC to frequently switch on machine.
The content of the invention
The object of the present invention is to provide a kind of time-delay soft start circuit for BOOST-PFC, during solving start
High current burns the problem of soft start resistance, further, additionally it is possible to solves that during shutdown soft start relay and core cannot be disconnected
The problem of piece drives.
To achieve the above object, the solution of the present invention includes：
A kind of time-delay soft start circuit for BOOST-PFC, in relay driving terminal（Q1 collectors）It is equipped with one
A delay driving circuit, delay driving circuit are used for the soft start pin for connecting control chip（SS）；Delay driving circuit includes
One charging circuit and a comparator, charging circuit connect comparator an input terminal, comparator output terminal connection described in
The soft start pin of control chip（SS）.
Before charging circuit charging reaches setting magnitude of voltage, comparator does not export so that closes and prolongs in relay
When after start to drive, realize the normal output of BOOST-PFC.
Further, busbar voltage detection signal terminal（V_SS）On be connected with switching on and shutting down control terminal（ON_OFF_CTR）.
Can be with the driving of controlling switch relay and control chip by the switching on and shutting down control terminal.
Further, the charging circuit is RC charging circuits, and capacitance is in series with a resistor, and series connection point connects the comparator
In-phase input end, the reverse inter-input-ing ending grounding of comparator.
Further, the switching on and shutting down control terminal（ON_OFF_CTR）With busbar voltage detection signal terminal（V_SS）Between
Equipped with backward dioded（D1）.
The soft start pin of control chip（SS）Backward dioded is connected between the output terminal of the comparator（D5）.
Brief description of the drawings
Fig. 1 is the circuit diagram of the prior art；
Fig. 2 is the circuit diagram of the present invention.
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
A kind of delay controllable soft start circuit for BOOST-PFC as shown in Figure 2, input voltage VIN are opened by soft
Dynamic resistance R7 charges to bus capacitor.Details are not described herein for the circuit part identical with background technology.
Start to drive afterwards to make to close in relay and be delayed, the normal output of BOOST-PFC is realized, such as Fig. 2 institutes
Show in relay driving terminal（Q1 collectors）A delay driving circuit is equipped with, delay driving circuit is used to connect control core
The soft start pin SS of piece；Delay driving circuit includes a charging circuit and a comparator, charging circuit connection comparator
An input terminal, comparator output terminal connect control chip soft start pin SS.
During start, when the coil of relay obtains electric, relay closure, electric current is flowed through from Q1, D1, R2, R1 so that V_SS points
There is the voltage of 6V, ensure that relay will not shake disconnection.Meanwhile electric current works as U2A by the C2 chargings that R5 is in charging circuit
The level of the 3rd foot when being more than 2 foot, the 1st foot of output terminal of amplifier U2A is high level, the soft start of SS connection control chips
Pin, chip start driving, and the value of adjustment R5 and C2 can set the length of delay time.Amplifier U2A and its peripheral circuit structure
Into a comparator.
In order to realize that relay and control chip driving simultaneously turn off.It is connected with busbar voltage detection signal terminal V_SS
Switching on and shutting down control terminal ON_OFF_CTR.During start, ON_OFF_CTR is high level.
During shutdown, ON_OFF_CTR signals are low level, and the cathode for making U1 is in high level, and Q1 is turned off, and relay disconnects, together
When C2 by D2, D1, R2, R1 discharge, when the level of the 3rd foot of U2A is less than 2 foot, its 1st foot of output terminal is low level,
By diode D5, make SS feet always to be low, control chip is exported without driving.
A kind of specific embodiment given above, but the present invention is not limited to described embodiment.The present invention's
Basic ideas are such scheme, and for those of ordinary skill in the art, teaching, designs various modifications according to the present invention
Structure, parameter and creative work need not be spent.Without departing from the principles and spirit of the present invention to embodiment party
The change, modification, replacement and modification that formula carries out are still fallen within protection scope of the present invention.
Claims (5)
1. a kind of time-delay soft start circuit for BOOST-PFC, it is characterised in that one is equipped with relay driving terminal
Delay driving circuit, delay driving circuit are used for the soft start pin (SS) for connecting control chip；Delay driving circuit includes one
A charging circuit and a comparator, charging circuit connect an input terminal of comparator, and comparator output terminal connects the control
The soft start pin (SS) of coremaking piece；High current burns asking for soft start resistance when the soft starting circuit can solve start
Topic.
A kind of 2. time-delay soft start circuit for BOOST-PFC according to claim 1, it is characterised in that busbar electricity
Switching on and shutting down control terminal (ON_OFF_CTR) is connected with pressure detection signal terminal (V_SS).
3. a kind of time-delay soft start circuit for BOOST-PFC according to claim 1, it is characterised in that described to fill
Circuit is RC charging circuits, and capacitance is in series with a resistor, and series connection point connects the in-phase input end of the comparator, comparator it is anti-
Phase input end grounding.
4. a kind of time-delay soft start circuit for BOOST-PFC according to claim 2, it is characterised in that described to open
Backward dioded is equipped between shutdown control terminal (ON_OFF_CTR) and busbar voltage detection signal terminal (V_SS).
A kind of 5. time-delay soft start circuit for BOOST-PFC according to claim 3, it is characterised in that control core
Backward dioded is connected between the soft start pin (SS) of piece and the output terminal of the comparator.
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 CN103904874A (en) | 2014-07-02 |
| CN103904874B true CN103904874B (en) | 2018-04-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410088978.8A Active CN103904874B (en) | 2014-03-11 | 2014-03-11 | A kind of time-delay soft start circuit for BOOST-PFC |
Country Status (1)
| Country | Link |
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| CN (1) | CN103904874B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553245B (en) * | 2015-09-10 | 2020-03-17 | 许继电源有限公司 | Soft start circuit |
| CN109067161B (en) * | 2018-08-09 | 2024-07-30 | 中国铁道科学研究院集团有限公司 | Power supply safety starting system |
| CN111785569B (en) * | 2020-06-29 | 2022-07-15 | 佛山科学技术学院 | Soft-start relay control circuit and charging circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (4)
| 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 |
| 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 |
| CN103427618B (en) * | 2013-06-24 | 2016-05-11 | 深圳市英威腾电气股份有限公司 | A kind of SS (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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Publication date |
|---|---|
| CN103904874A (en) | 2014-07-02 |
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