CN1641958A - Power factor improving device built in DC-DC converter - Google Patents
Power factor improving device built in DC-DC converter Download PDFInfo
- Publication number
- CN1641958A CN1641958A CN 200410001228 CN200410001228A CN1641958A CN 1641958 A CN1641958 A CN 1641958A CN 200410001228 CN200410001228 CN 200410001228 CN 200410001228 A CN200410001228 A CN 200410001228A CN 1641958 A CN1641958 A CN 1641958A
- Authority
- CN
- China
- Prior art keywords
- power factor
- power supply
- power
- improving
- 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
Links
Images
Classifications
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention relates to a power-factor improving device of built-in DC-DC converter. It comprises power factor controller, high voltage rectifier and low voltage rectifier. The power factor controller is used to receive a AC power supply that includes transformer. The first secondary winding of secondary side of transformer is used to output the first power supply according to AC power supply; and the second secondary winding is used to output the second power supply according to AC power supply. The high voltage rectifier converts the voltage from the first power supply into high voltage DC power supply, and the low voltage rectifier converts the second power supply into the first DC power supply. The power factor controller adjusts the power factor according to the first DC power supply.
Description
Technical field
The present invention is relevant for a kind of power-factor improvement (Power Factor Correction, PFC) device, and particularly relevant for a kind of device for improving power factor of built-in DC-to-DC converter.
Background technology
General display unit for example is cathode-ray tube display, liquid crystal screen display etc., generally only is provided to the image of thirty or forty inch, and bulky, is not easy to carry.And projector can export tens of inch to up to a hundred inches images, and volume little be that cathode-ray tube display or LCD can't contend with.No matter be on the purposes of amusement or business in brief therefore, the status that projector takes advantage.
Fig. 1 is a known projector calcspar.Projector 100 comprises power factor controller 110, DC-to-DC change-over circuit 120, lamp circuit 130, control circuit 140 and lamp 150.Power factor controller 110 and DC-to-DC change-over circuit 120 provide device for the power supply of projector 100.Power reforming circuit 110 provides the high-voltage DC power supply of about 380V to lamp circuit 130, and provides about 380 volts high-voltage DC power supply to DC-to-DC change-over circuit 120.Lamp circuit 130 for example is electric ballast (ballast), is used to light lamp 150.DC-to-DC change-over circuit 120 for example is isolated flyback (flyback) circuit, and being used for for example is that the DC power supply of 12V, 5V and 3.3V is used for control circuit 140.Control circuit 140 promptly is the work that is used to control projector 100.
Along with the progress of science and technology, projector also with and compact trend is arranged gradually, carry to make things convenient for the consumer.Therefore, the volume of lasting reduced projection machine is the target that endeavour this area.
Summary of the invention
In view of this, purpose of the present invention is exactly in that a kind of device for improving power factor of built-in DC-to-DC converter is provided, with the volume of reduced projection machine.
According to purpose of the present invention, a kind of device for improving power factor is proposed, comprise power factor controller high-voltage rectifier and low-voltage rectifier.Power factor control device is used to receive an AC power, comprises transformer.First secondary winding of secondary side of transformer is used for exporting first power supply according to AC power; Its for the second time coil be used for exporting a second source according to this AC power.High-voltage rectifier receives first power supply and is converted into high-voltage DC power supply.Low-voltage rectifier receives second source and is converted into first DC power supply.Power factor controller is adjusted the power factor of device for improving power factor according to first DC power supply.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows.
Description of drawings
Fig. 1 is a known projector calcspar.
Fig. 2 is a kind of projector calcspar according to a preferred embodiment of the present invention.
Fig. 3 is the device for improving power factor calcspar of built-in DC-to-DC converter.
Fig. 4 is the circuit diagram of the device for improving power factor of built-in DC-to-DC converter.
Fig. 5 A is another routine circuit diagram of low-voltage rectifier 350.
Fig. 5 B is another routine circuit diagram of DC-to-DC converter 360.
The drawing reference numeral explanation
110: power factor controller
120,360,370: DC-to-DC converter
100,200: projector
210: the device for improving power factor of built-in DC-to-DC converter
130,230: lamp circuit
140,240: control circuit
150,250: lamp
310: rectification circuit
320: power supply provides circuit
330: the power factor controlling chip
340: feedback circuit
345: high-voltage rectifier
350: low-voltage rectifier
352,353: rectification unit
356: feedback unit
Embodiment
The power supply of known projector provides circuit to comprise power factor correction circuit and DC-to-DC change-over circuit.The present invention is built in the DC-to-DC change-over circuit in the power factor correction circuit, provides the size of circuit with the power supply of reduced projection machine, and then size that can the reduced projection machine.
Fig. 2 is a kind of projector calcspar according to a preferred embodiment of the present invention.Projector 200 comprises device for improving power factor 210, lamp circuit 230, control circuit 240 and the lamp 250 of built-in DC-to-DC converter.Power factor correction circuit 210 provides device for the power supply of projector 200, be used to provide the high-voltage DC power supply of about 380V to lamp circuit 230, and provide DC power supply to control circuit 240, with as the required power supply of the work of control circuit 240, for example be the DC power supply of 12V, 5V and 3.3V.Lamp circuit 230 for example is electric ballast (ballast), is used to light lamp 250.Control circuit 240 promptly is the work that is used to control projector 200.
Fig. 3 is the device for improving power factor calcspar of built-in DC-to-DC converter.The device for improving power factor 210 of built-in DC-to-DC converter comprises power factor controller, high-voltage rectifier 345, low-voltage rectifier 350, DC-to-DC converter 360 and DC-to-DC converter 370.Power factor controller comprises that rectification circuit 310, power supply provide circuit 320, transformer T, power factor controlling chip 330, power factor switch 335, detect resistance R 5 and feedback circuit 340.Rectification circuit 310 is used to receive AC power AC, exports after being converted into DC power supply.Power supply is converted to DC power supply Vcc after providing circuit 320 to receive the DC power supply of rectification circuit 310 outputs, to supply with power factor controlling chip 330 and feedback circuit 340.Transformer T comprises first siding ring and second siding ring, and wherein second siding ring comprises time coil SL1 and SL2.The voltage of power factor controlling chip 330 primary side of receiving transformer T via detecting resistance R 5, and the feedback signal FB1 of reception feedback circuit 340 and the feedback signal FB2 of power factor switch 335, power controlling factor switch 335 according to this then is to improve power factor.
The output valve of the inferior coil SL1 of the secondary side of high-voltage rectifier 345 receiving transformer T and export a high-voltage DC power supply Vh according to this and give lamp circuit 230.The value of high-voltage DC power supply Vh for example is the 380V of direct current.
The output valve of the inferior coil SL2 of the secondary side of low-voltage rectifier 350 receiving transformer T is also exported a direct current power supply V1 according to this.The value of DC power supply V1 for example is 12V.And DC power supply V1 feeds back to feedback circuit 340, so that power factor controlling chip 330 power controlling factor value according to this.
DC-to-DC converter 360 receives DC power supply V1, is to export behind the DC power supply V2 with its step-down.The value of DC power supply V2 for example is 5V.DC-to-DC converter 370 receives DC power supply V1, is to export behind the DC power supply V3 with its step-down.The value of DC power supply V3 for example is 3.3V.DC power supply V1, V2 and V3 are used to provide the operation of control circuit 240 required.
Fig. 4 is the circuit diagram of the device for improving power factor of built-in DC-to-DC converter.Rectification circuit 310 for example is the full-wave rectifying circuit shown in the figure, comprises four diode BD1, BD2, BD3, BD4 and capacitor C 1.Power supply provides circuit 320 to provide DC power supply Vcc to the power factor controlling chip, comprises resistance R 1, R2, R4, diode D1, capacitor C 2, C3, Zener diode (zener diode) ZD1.Feedback circuit 340 comprises resistance R 3, R6, R7 and optical coupler IC2, is used for according to the DC power supply V1 of low-voltage rectifier 350 output output feedback signal FB1 to power factor controlling chip 330.Power factor switch 335 comprises transistor Q1, resistance R 8 and R9.The magnitude of voltage of the drain electrode of transistor Q1 is feedback signal FB2.Via the conducting of resistance R 8 oxide-semiconductor control transistors Q1 whether power factor controlling chip 330 according to feedback signal FB1 and FB2 and.When transistor Q1 conducting, electrical power storage is in transformer T, and when transistor Q1 turn-offed, transformer T promptly discharged electric energy to high-voltage rectifier 345 and low-voltage rectifier 350.High-voltage rectifier 345 for example is a half-wave rectifying circuit, comprises diode D2 and capacitor C 7, is used for the output valve of the inferior coil SL1 of transformer T is converted to high-voltage DC power supply Vh.
Low-voltage rectifier 350 comprises rectification unit 352, filter unit 354 and feedback unit 356.The output of the inferior coil SL2 of the second siding ring of low-voltage rectifier 350 receiving transformer T, and behind rectification unit 352 and filter unit 354 output DC source V1.Rectification unit 352 for example is a full-wave rectifying circuit, comprises diode BD5, BD6, BD7, BD8 and capacitor C 4.Filter circuit 354 comprises inductance L 1 and capacitor C 5.DC power supply V1 is more via feedback unit 356 and feedback circuit 340 and feed back to power factor controlling chip 330 with the reference as its correcting power factors.Feedback unit 356 comprises resistance R 10, R11, R12, R13, R14, C6, voltage stabilizing chip IC 3 and optical coupler IC2.Feedback unit 356 feeds back the value of DC power supply V1 by optical coupler IC2, to avoid influencing the stable of DC power supply V1.
DC-to-DC converter 360 for example is buck converter (buck converter), comprise decompression voltage regulator, for example be exchange voltage stabilizing chip IC 4, and diode D4, inductance L 2, capacitor C 8, resistance R 15 and R16, being used for DC power supply V1 step-down is DC power supply V2.DC-to-DC converter 370 for example is buck converter (buck converter), comprise decompression voltage regulator, for example be switch type voltage stabilizing chip IC 5 and diode D5, inductance L 3, capacitor C 9, resistance R 17 and R18, being used for DC power supply V1 step-down is DC power supply V3.
Fig. 5 A is another routine circuit diagram of low-voltage rectifier 350.Low-voltage rectifier 350 comprises rectification unit 353 and feedback unit 356.Rectification unit 353 is a half-wave rectifying circuit, comprises diode D6 and capacitor C 10.The circuit of the low-voltage rectifier shown in Fig. 5 A is comparatively simple compared with the circuit of low-voltage rectifier shown in Figure 4, so cost is lower.
Fig. 5 B is another routine circuit diagram of DC-to-DC converter 360.DC-to-DC converter 360 comprises tandem linear voltage stabilization chip IC 6 and capacitor C 10, and being used for DC power supply V1 step-down is DC power supply V2.
Lower pressure rectifier circuit in the disclosed device for improving power factor of the above embodiment of the present invention, DC-to-DC converter can adopt aforesaid different circuit according to the consideration of cost.The built-in DC-to-DC converter of device for improving power factor provides circuit with the power supply of reduced projection machine, and then size that can the reduced projection machine.
In sum, though the present invention with preferred embodiment openly as above, so it is not to be used to limit the present invention, any those skilled in the art, under the situation that does not break away from the spirit and scope of the present invention, can carry out various changes and modification, therefore scope of the present invention is as the criterion with the claim restricted portion that is proposed.
Claims (27)
1. device for improving power factor comprises:
One power factor controller is used to receive an AC power, comprising:
One transformer, the secondary side of this transformer comprises:
One coil for the first time is used for exporting one first power supply according to this AC power;
One coil for the second time is used for exporting a second source according to this AC power;
One high-voltage rectifier, with this first time coil be electrically connected, be used to receive this first power supply and be converted into a high-voltage DC power supply; And
One low-voltage rectifier, with this second time coil be electrically connected, be used to receive this second source and be converted into one first DC power supply;
Wherein, this power factor controller is adjusted the power factor of this device for improving power factor according to this first DC power supply.
2. device for improving power factor as claimed in claim 1, wherein this device also comprises:
One first DC-to-DC converter receives this first DC power supply, with output one second DC power supply after its step-down; And
One second DC-to-DC converter, receive this first DC power supply with its step-down after output one the 3rd DC power supply.
3. device for improving power factor as claimed in claim 2, wherein this first DC-to-DC converter comprises a decompression voltage regulator and a filter circuit, is used to export this second DC power supply.
4. device for improving power factor as claimed in claim 2, wherein this second DC-to-DC converter comprises a decompression voltage regulator and a filter circuit, is used to export the 3rd DC power supply.
5. device for improving power factor as claimed in claim 1, wherein this power factor controller also comprises a feedback circuit, be used for exporting a feedback signal according to this first DC power supply, this power factor controller is promptly adjusted the power factor of this device for improving power factor according to this feedback signal.
6. device for improving power factor as claimed in claim 5, wherein this feedback signal feeds back to this power factor controller via an optical coupler.
7. device for improving power factor as claimed in claim 1, wherein this high-voltage rectifier be half bridge rectifier and a full-bridge type rectification circuit one of them.
8. device for improving power factor as claimed in claim 1, wherein this low-voltage rectifier comprise half bridge rectifier and a full-bridge type rectification circuit one of them.
9. device for improving power factor as claimed in claim 1, wherein this device is applied to a projector.
10. device for improving power factor as claimed in claim 9, wherein this high-voltage DC power supply is used to be powered at an electric ballast.
11. the device for improving power factor with DC-DC converter comprises:
One power factor controller is used to receive an AC power, comprising:
One transformer, the secondary side of this transformer comprises:
One coil for the first time is used for exporting one first power supply according to this AC power;
One coil for the second time is used for exporting a second source according to this AC power;
One high-voltage rectifier, with this first time coil be electrically connected, be used to receive this first power supply and be converted into a high-voltage DC power supply;
One low-voltage rectifier, with this second time coil be electrically connected, be used to receive this second source and be converted into one first DC power supply;
One first DC-to-DC converter receives this first DC power supply, with output one second DC power supply after its step-down; And
One second DC-to-DC converter, receive this first DC power supply with its step-down after output one the 3rd DC power supply;
Wherein, this power factor controller is adjusted the power factor of this device for improving power factor according to this first DC power supply.
12. device for improving power factor as claimed in claim 11, wherein this first DC-to-DC converter comprises a decompression voltage regulator and a filter circuit, is used to export this second DC power supply.
13. device for improving power factor as claimed in claim 11, wherein this second DC-to-DC converter comprises a decompression voltage regulator and a filter circuit, is used to export this second DC power supply.
14. device for improving power factor as claimed in claim 11, wherein this power factor controller also comprises a feedback circuit, to export a feedback signal according to this first DC power supply, this power factor controller is promptly adjusted the power factor of this device for improving power factor according to this feedback control signal.
15. device for improving power factor as claimed in claim 14, wherein this feedback signal feeds back to this power factor controller via an optical coupler.
16. device for improving power factor as claimed in claim 11, wherein this high-voltage rectifier be half bridge rectifier and a full-bridge type rectification circuit one of them.
17. device for improving power factor as claimed in claim 11, wherein this low-voltage rectifier comprise half bridge rectifier and a full-bridge type rectification circuit one of them.
18. device for improving power factor as claimed in claim 11, wherein this device is applied to a projector.
19. device for improving power factor as claimed in claim 18, wherein this high-voltage DC power supply is used to be powered at an electric ballast.
20. the projector with power factor circuit of DC-to-DC converter, this projector comprises:
One lamp;
One control circuit, this control circuit is used to control the work of this projector;
One lamp circuit, this lamp circuit provide this lamp one voltage source;
One power factor controller is used to receive an AC power, comprising:
One transformer, the secondary side of this transformer comprises:
One coil for the first time is used for exporting one first power supply according to this AC power;
One coil for the second time is used for exporting a second source according to this AC power;
One high-voltage rectifier, with this first time coil be electrically connected, be used to receive this first power supply and be converted into a high-voltage DC power supply, so that this lamp circuit to be provided; And
One low-voltage rectifier, with this second time coil be electrically connected, be used to receive this second source and be converted into one first DC power supply, so that this control circuit to be provided;
Wherein, this power factor controller is adjusted the power factor of this device for improving power factor according to this first DC power supply.
21. device for improving power factor as claimed in claim 20, wherein this device also comprises:
One first DC-to-DC converter receives this first DC power supply, with output one second DC power supply after its step-down; And
One second DC-to-DC converter, receive this first DC power supply with its step-down after output one the 3rd DC power supply.
22. device for improving power factor as claimed in claim 21, wherein this first DC-to-DC converter comprises a decompression voltage regulator and a filter circuit, is used to export this second DC power supply.
23. device for improving power factor as claimed in claim 21, wherein this second DC-to-DC converter comprises a decompression voltage regulator and a filter circuit, is used to export this second DC power supply.
24. device for improving power factor as claimed in claim 20, wherein this power factor controller also comprises a feedback circuit, to export a feedback signal according to this first DC power supply, this power factor controller is promptly adjusted the power factor of this device for improving power factor according to this feedback control signal.
25. device for improving power factor as claimed in claim 24, wherein this feedback signal feeds back to this power factor controller via an optical coupler.
26. device for improving power factor as claimed in claim 20, wherein this high-voltage rectifier be half bridge rectifier and a full-bridge type rectification circuit one of them.
27. device for improving power factor as claimed in claim 20, wherein this low-voltage rectifier comprise half bridge rectifier and a full-bridge type rectification circuit one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410001228 CN1641958A (en) | 2004-01-02 | 2004-01-02 | Power factor improving device built in DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410001228 CN1641958A (en) | 2004-01-02 | 2004-01-02 | Power factor improving device built in DC-DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1641958A true CN1641958A (en) | 2005-07-20 |
Family
ID=34867070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410001228 Pending CN1641958A (en) | 2004-01-02 | 2004-01-02 | Power factor improving device built in DC-DC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1641958A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7894215B2 (en) | 2006-08-23 | 2011-02-22 | Qisda Corporation | Electronic apparatus, AC/DC conversion device and power factor correction circuit thereof |
| CN101144962B (en) * | 2006-09-12 | 2011-07-27 | 佳世达科技股份有限公司 | Electronic device and its power factor improvement return circuit |
| CN104062834A (en) * | 2014-06-09 | 2014-09-24 | 苏州佳世达光电有限公司 | Projector power supply system |
-
2004
- 2004-01-02 CN CN 200410001228 patent/CN1641958A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7894215B2 (en) | 2006-08-23 | 2011-02-22 | Qisda Corporation | Electronic apparatus, AC/DC conversion device and power factor correction circuit thereof |
| CN101144962B (en) * | 2006-09-12 | 2011-07-27 | 佳世达科技股份有限公司 | Electronic device and its power factor improvement return circuit |
| CN104062834A (en) * | 2014-06-09 | 2014-09-24 | 苏州佳世达光电有限公司 | Projector power supply system |
| CN104062834B (en) * | 2014-06-09 | 2016-04-06 | 苏州佳世达光电有限公司 | Projector's power-supply system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8242712B2 (en) | Power supply apparatus | |
| CN102243850B (en) | Backlight source driving circuit, driving method thereof as well as liquid crystal television | |
| KR100878222B1 (en) | Apparatus for supplying power for a liquid crystal display | |
| US8625310B2 (en) | Method of supplying power, power supply apparatus for performing the method and display apparatus having the apparatus | |
| CN103701327B (en) | Offline power inverter and it is suitable for integrated circuit therein | |
| CN102065600A (en) | LED dimming driving system | |
| CN1475882A (en) | Device for controlling printing machine power supply and its method | |
| CN101938865A (en) | Dimmable light-emitting diode device used for reducing output ripple current and driving circuit thereof | |
| CN102076151A (en) | High-efficiency light emitting diode (LED) drive circuit and drive method | |
| CN108231014B (en) | Regional dimming constant current control circuit, driving power supply and television | |
| CN1379536A (en) | Switch power source device | |
| CN101925230A (en) | LED (Light Emitting Diode) drive power source with high efficiency, low power consumption and low cost | |
| KR20110136537A (en) | Led driving circuit and method for protecting from high voltage and driving with constant current | |
| US8508154B2 (en) | Lighting devices | |
| CN202210400U (en) | Backlight drive circuit and liquid crystal TV set | |
| CN1741361A (en) | Supply unit and method | |
| US7161307B2 (en) | Power factor correction apparatus with embedded DC—DC converter | |
| CN1641958A (en) | Power factor improving device built in DC-DC converter | |
| KR20130135718A (en) | Display device having led backlight and power supply device and method thereof | |
| CN108156691A (en) | Non-point light source non-stroboscopic light modulation circuit | |
| CN211906914U (en) | Backlight driving circuit and display device | |
| CN1640207A (en) | Electronic circuit and method of supplying energy to a high-pressure gas-discharge lamp | |
| CN110769173B (en) | Television power supply system and television | |
| CN212256867U (en) | LED backlight source driving device and television | |
| WO2020052404A1 (en) | Drive circuit for flicker-free led lighting having high power factor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |