CN203851016U - A time-delay soft start circuit used for BOOST-PFC - Google Patents
A time-delay soft start circuit used for BOOST-PFC Download PDFInfo
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- CN203851016U CN203851016U CN201420110082.0U CN201420110082U CN203851016U CN 203851016 U CN203851016 U CN 203851016U CN 201420110082 U CN201420110082 U CN 201420110082U CN 203851016 U CN203851016 U CN 203851016U
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- soft start
- delay
- time
- boost
- circuit
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- 238000001514 detection method Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000013021 overheating Methods 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
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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 utility model relates to a time-delay soft start circuit used for BOOST-PFC. A driving time-delay circuit and an on-off control terminal are added on the basis of background technology. After closing and time-delay of a relay, driving begins so as to realize a normal output of the BOOST-PFC. Driving for the soft start relay and a chip is switched off after shutdown is carried out. The control chip is enabled to output driving after the relay is closed and performs time-delay for a certain time, so that overheating of a soft start resistor will not occur.
Description
Technical field
The utility model 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.
Utility model content
The purpose of this utility model is to provide a kind of time-delay soft start circuit for BOOST-PFC, the problem that large electric current while start in order to solve burns soft start resistance, further, can also solve shutdown time, can not disconnect the problem of soft start relay and chip drives.
For achieving the above object, scheme of the present utility model 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).
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of prior art;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in more 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 ensured 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 utility model is not limited to described execution mode.Basic ideas of the present utility model are such scheme, and for those of ordinary skill in the art, according to instruction of the present utility model, structure, the parameter of designing various distortion do not need to spend creative work.Variation, amendment, replacement and the modification of in the situation that not departing from principle of the present utility model and spirit, execution mode being carried out still fall in protection range of the present utility model.
Claims (5)
1. for a time-delay soft start circuit of BOOST-PFC, it is characterized in that, be provided with a delay driving circuit in relay drive terminal, 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 2, it is characterized in that, 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.
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 |
|---|---|---|---|
| CN201420110082.0U CN203851016U (en) | 2014-03-11 | 2014-03-11 | A time-delay soft start circuit used for BOOST-PFC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420110082.0U CN203851016U (en) | 2014-03-11 | 2014-03-11 | A time-delay soft start circuit used for BOOST-PFC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203851016U true CN203851016U (en) | 2014-09-24 |
Family
ID=51563986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420110082.0U Expired - Lifetime CN203851016U (en) | 2014-03-11 | 2014-03-11 | A time-delay soft start circuit used for BOOST-PFC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203851016U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904874A (en) * | 2014-03-11 | 2014-07-02 | 许继电气股份有限公司 | Delay soft start circuit used for BOOST-PFC |
| CN105471280A (en) * | 2015-12-30 | 2016-04-06 | 深圳市合信自动化技术有限公司 | Device and method for protecting soft start failure of AC/DC/AC driver |
-
2014
- 2014-03-11 CN CN201420110082.0U patent/CN203851016U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904874A (en) * | 2014-03-11 | 2014-07-02 | 许继电气股份有限公司 | Delay soft start circuit used for BOOST-PFC |
| CN105471280A (en) * | 2015-12-30 | 2016-04-06 | 深圳市合信自动化技术有限公司 | Device and method for protecting soft start failure of AC/DC/AC driver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140924 |
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| CX01 | Expiry of patent term |