CN104702091A - Soft start circuit of switching power supply - Google Patents
Soft start circuit of switching power supply Download PDFInfo
- Publication number
- CN104702091A CN104702091A CN201310661899.7A CN201310661899A CN104702091A CN 104702091 A CN104702091 A CN 104702091A CN 201310661899 A CN201310661899 A CN 201310661899A CN 104702091 A CN104702091 A CN 104702091A
- Authority
- CN
- China
- Prior art keywords
- power supply
- current
- soft start
- switching power
- start circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
An embodiment of the invention discloses a soft start circuit of a switching power supply. By a current limiting resistor, the current of a rectified voltage is limited, and a first capacitor is charged; by a first transformer, the voltage of which the current is limited is transformed and outputted; and the current limiting resistor is connected with a normally open switch of a relay in parallel. The soft start circuit is arranged on an inputting circuit of the switching power supply and prevents surge current, and the switching power supply can run normally and reliably.
Description
Technical field
The present invention relates to a kind of start-up circuit, particularly relate to a kind of soft start circuit of switch power supply.
Background technology
The input circuit of current Switching Power Supply mostly adopts rectification to add the circuit of capacitor filtering, connects moment in input, because the initial voltage on capacitor is zero can form very large temporary impact electric current.Particularly high power switching power supply, its input adopts the filtering capacitor of larger capacity, and its impulse current can reach more than 100A.Connect impulse current amplitude so large instantaneously at power supply, often cause input fuse to blow, sometimes even by the burning of contact of closing switch, the lighter also can make air switch close not brake application, and above-mentioned reason all can cause Switching Power Supply normally to drop into.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of soft start circuit of switch power supply.Soft start mechanism can be provided.
In order to solve the problems of the technologies described above, embodiments provide a kind of soft start circuit of switch power supply, by current-limiting resistance current limliting be carried out to the voltage after rectification and be the first capacitor charging, by the first transformer, transformation is carried out to the voltage after current limliting, and export; The normal open switch of described current-limiting resistance relay in parallel.
Further, the primary coil series connection NPN triode of described transformer, described NPN transistor base drives conducting by drive circuit.
Implement the embodiment of the present invention, there is following beneficial effect: the present invention is the soft starting circuit preventing impulse current that Switching Power Supply is arranged at its input circuit, to ensure that Switching Power Supply normally and is reliably run.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
With reference to the electrical block diagram of the present invention shown in Fig. 1.
Of the present inventionly softly open circuit, by current-limiting resistance R1, connection is limited starting current instantaneously, filtering capacitor C1 is charged, simultaneously auxiliary is that power Vcc is charged to the capacitor C2 being connected to relay K 1 line bag through resistance R2, when the charging voltage on C2 reaches the operation voltage of relay, K1 action, bypass current-limiting resistance R1, reaches the effect of instantaneous impulse-current-proof.
More preferably, allow the primary coil series connection NPN triode of transformer, described NPN transistor base drives conducting by drive circuit, controls power supply and exports, ensure the safety of access electrical equipment when moment current-limited startup.
Above disclosedly be only a kind of preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (2)
1. a soft start circuit of switch power supply, is characterized in that, carries out current limliting and be the first capacitor charging by current-limiting resistance to the voltage after rectification, carries out transformation, and export by the first transformer to the voltage after current limliting; The normal open switch of described current-limiting resistance relay in parallel.
2. soft start circuit of switch power supply according to claim 1, is characterized in that, the primary coil series connection NPN triode of described transformer, described NPN transistor base drives conducting by drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310661899.7A CN104702091A (en) | 2013-12-10 | 2013-12-10 | Soft start circuit of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310661899.7A CN104702091A (en) | 2013-12-10 | 2013-12-10 | Soft start circuit of switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104702091A true CN104702091A (en) | 2015-06-10 |
Family
ID=53348937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310661899.7A Pending CN104702091A (en) | 2013-12-10 | 2013-12-10 | Soft start circuit of switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104702091A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110168908A (en) * | 2016-12-27 | 2019-08-23 | 株式会社开道 | Three-phase/single phase alternating current power supply corresponds to type electrical hoist |
| CN110829818A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Power supply circuit, control method and device of power supply circuit and air conditioner |
| CN110829817A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Control circuit, control method and device of control circuit and air conditioner |
-
2013
- 2013-12-10 CN CN201310661899.7A patent/CN104702091A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110168908A (en) * | 2016-12-27 | 2019-08-23 | 株式会社开道 | Three-phase/single phase alternating current power supply corresponds to type electrical hoist |
| CN110168908B (en) * | 2016-12-27 | 2021-05-11 | 株式会社开道 | Three-phase/single-phase AC power supply corresponding type electric hoist |
| CN110829818A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Power supply circuit, control method and device of power supply circuit and air conditioner |
| CN110829817A (en) * | 2019-11-18 | 2020-02-21 | 广东美的暖通设备有限公司 | Control circuit, control method and device of control circuit and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150610 |
|
| WD01 | Invention patent application deemed withdrawn after publication |