CN2428913Y - Inverse-excitation type switch power-supply - Google Patents
Inverse-excitation type switch power-supply Download PDFInfo
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- CN2428913Y CN2428913Y CN 00226340 CN00226340U CN2428913Y CN 2428913 Y CN2428913 Y CN 2428913Y CN 00226340 CN00226340 CN 00226340 CN 00226340 U CN00226340 U CN 00226340U CN 2428913 Y CN2428913 Y CN 2428913Y
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- circuit
- power supply
- utility
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- electric network
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Abstract
The utility model provides an inverse-excitation type switch power-supply, which is used for the power supplying of electric appliances. The utility model comprises a rectificated bridge D, high-frequency rectificated current, an electronic switch circuit and a feedback circuit which are composed of the existing known power supply, and the utility model is also provided with a controller which controls the work of the electronic switch circuit and is composed of switch power supply special purpose integrated circuits IC at the same time, wherein, the '1' end of lead wires of the IC is connected with leakage resistor R1 and R2 in an external connection mode; the output end of the rectificated bridge D is connected with a capacitor C [0] in a bridge connection mode. When the utility model is used in an electric network, the electric network is equal to be connected with pure resistance load. Thus, the utility model has the advantages that work power factor of the electric network can be effectively enhanced; the pollution of high-frequency harmonics to the electric network is reduced; the cost is low.
Description
The utility model belongs to power supply, is a kind of inverse-excitation type switch power-supply.
At present, inverse-excitation type switch power-supply commonly used both at home and abroad is mostly by rectifier bridge D, filter capacitor C, and bleeder resistance R1, R2, high-frequency rectification circuit, electronic switching circuit, controller and feedback circuit are formed (referring to Fig. 1).It is by rectifier bridge D, electrochemical capacitor C, and resistance R 1, R2 rectifying and wave-filtering are the high-frequency rectification circuit power supply, again by being electric power supply after the rectification of high-frequency rectification circuit transformation; The work of electronic switching circuit control high-frequency rectification circuit, controller control electronic switch circuit for working, feedback circuit feedback power supply output signal is handled by controller, to improve the power supply output quality.The shortcoming of this power supply is in the circuit by electrochemical capacitor C (prevailing value is bigger) filtering, thereby the mains supply ON time shortens, influence electrical network, cause its power factor step-down (being generally about 0.7), particularly the high order harmonic component that is produced causes electric network pollution.
In order to address the above problem, some Switching Power Supply adopts the additional on the original basis power factor calibration system of being made up of reactor, electronic switch, power factor correction etc.Owing to make power supply costly, influence is promoted the use of.
The objective of the invention is to overcome the shortcoming of prior art, develop inverse-excitation type switch power-supply, provide a kind of and can guarantee that power supply grid works under High Power Factor, and simple in structure, the Switching Power Supply of cost minuent.
The composition of this Switching Power Supply comprises:
1, adopts the rectifier bridge D of existing known technology, R1, R2, bleeder resistance, high-frequency rectification circuit, electronic switching circuit, feedback circuit;
2, the controller that constitutes by Switching Power Supply application-specific integrated circuit (ASIC) IC.The lead-in wire of IC " 1 " end joins with resistance R 1, R2 junction, and its " M " end joins with electronic switching circuit, and " N " end joins with feedback circuit;
3, at rectifier bridge D output cross-over connection high-frequency filter capacitor C
0
In such scheme, integrated circuit (IC) can adopt ambipolar middle road UC3842-UC3845, and KA3842-KA3845 also can adopt CMOS type circuit FA1342-FA1345 or CDMOS type circuit U C3801-UC3805.
Take the Switching Power Supply of such scheme
1. reduce by the influence of electrochemical capacitor use, improve the output power factor, eliminate the pollution of high-frequency harmonic electrical network to electrical network.
2. adopt the power supply architecture of power factor calibration system simple, with low cost.
Description of drawings:
Fig. 1 is the described Switching Power Supply structure principle chart of background technology.
Fig. 2 is the improvement part structure principle chart
Below in conjunction with accompanying drawing this Switching Power Supply operation principle is done simple declaration:
When mains supply through rectifier bridge D rectification, capacitor C
0High frequency filter (because capacitance is less, so little to electric network influencing) back is the high-frequency rectification circuit power supply.The modulation signal of drawing (sinusoidal wave and direct current synthesizes) from bleeder resistance R1 and R2 junction, enter the interior ring of IC circuit by integrated circuit (IC) " 1 " end, make it to produce the pulse of switch inversion element drives, the control electronic switch circuit for working, make the average current near sinusoidal ripple or the grid voltage waveform of the high frequency transformer that flows through in the high-frequency rectification circuit, to guarantee the normal output of this power supply, concerning electrical network, the pure resistive load of similar access, can not bring considerable influence, guarantee that electrical network is in high power factor work.Following high-frequency rectification circuit, electronic switching circuit, feedback circuit are owing to adopting prior art, so working condition is not stated tired.
On the basis of such scheme, still can adopt the adding multiplier, the modulation signal that to draw from R1, R2 junction is handled to multiplier with the feedback signal of drawing from feedback circuit, transports to integrated IC again and takes this scheme, for improving grid power factor, better effects if.
Claims (3)
1, a kind of inverse-excitation type switch power-supply that is used to electric power supply, its composition comprises rectifier bridge D, bleeder resistance R1, R2, high-frequency rectification circuit, electronic switching circuit, feedback circuit is characterized in that also having the control electronic switch circuit for working, by the controller that Switching Power Supply application-specific integrated circuit (ASIC) IC constitutes, integrated circuit (IC) lead-in wire " 1 " end joins with bleeder resistance R1 and R2 connection; At rectifier bridge D output cross-over connection high-frequency filter capacitor C
0
2, Switching Power Supply according to claim 1 is characterized in that described integrated circuit (IC) adopts ambipolar circuit U C3842-UC3845.
3, Switching Power Supply according to claim 1 is characterized in that described integrated circuit (IC) adopts CMOS type circuit FA1342-FA1345.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00226340 CN2428913Y (en) | 2000-04-27 | 2000-04-27 | Inverse-excitation type switch power-supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00226340 CN2428913Y (en) | 2000-04-27 | 2000-04-27 | Inverse-excitation type switch power-supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2428913Y true CN2428913Y (en) | 2001-05-02 |
Family
ID=33590207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00226340 Expired - Fee Related CN2428913Y (en) | 2000-04-27 | 2000-04-27 | Inverse-excitation type switch power-supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2428913Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727308A (en) * | 2013-11-25 | 2014-04-16 | 青岛盛嘉信息科技有限公司 | Digital control electric water heater |
-
2000
- 2000-04-27 CN CN 00226340 patent/CN2428913Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727308A (en) * | 2013-11-25 | 2014-04-16 | 青岛盛嘉信息科技有限公司 | Digital control electric water heater |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |