CN101801135A - High-efficiency and low-harmonic LED optical projection engine driving power supply - Google Patents
High-efficiency and low-harmonic LED optical projection engine driving power supply Download PDFInfo
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- CN101801135A CN101801135A CN201010126146A CN201010126146A CN101801135A CN 101801135 A CN101801135 A CN 101801135A CN 201010126146 A CN201010126146 A CN 201010126146A CN 201010126146 A CN201010126146 A CN 201010126146A CN 101801135 A CN101801135 A CN 101801135A
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a high-efficiency and low-harmonic LED optical projection engine driving power supply, belonging to the technical fields of power supplies and electrons. The power supply comprises an LED light source driving part, a projector system and a heat-radiating part, wherein the LED light source driving part comprises a rectifier and filter circuit 1, a high-frequency transformer 2 (from one end of a primary winding to a secondary winding) and a high-frequency rectifier and filter circuit 3 which are connected in sequence; the output end of the high-frequency rectifier and filter circuit 3 connects with a constant current control circuit 4 and a power factor correction and control circuit 5 in sequence to the other end of the primary winding of the high-frequency transformer 2; another path of the output end of the rectifier and filter circuit 1 is connected with the input end D of a compensation circuit 6; and the output end E of the compensation circuit 6 is connected with an internal multiplying unit M of the power factor correction and control circuit 5. The invention has the advantages of simple structure, low cost, high load, high conversion efficiency, low harmonic current, constant current control, wide range of input voltage, long service life, high reliability, low temperature, energy saving and environmental protection; and the invention is applicable for various LED light source projectors.
Description
Affiliated technical field
The present invention relates to a kind of Switching Power Supply, especially LED optical projection power supply belongs to power supply and electronic technology field.
Background technology
At present, traditional projector adopts the UHP bulb to do light source, and its life-span is short, has only 3000-5000 hour, and the cost height more changes the bulb.And the led light source life-span can reach 30000-50000 hour, does not need all the life to change; Its luminous efficiency height, and light efficiency improves very big leeway is still arranged, make and use pollution-free, use cost is low.Therefore, use the LED projection light source not only to bring material benefit, effects of energy saving and emission reduction is also arranged to the user.Require the LED driving power supporting with it accordingly, at present the Universal LED driving power have that conversion efficiency is low, type of drive is unreasonable (capacitance-resistance constant voltage driving), to the serious shortcomings such as (harmonic current are too high) of electric network pollution.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing LED driving power, the invention provides a kind of power supply of powering for the led light source of projector specially.
The technical solution adopted for the present invention to solve the technical problems is: high-efficiency and low-harmonic LED optical projection engine driving power supply comprises led light source drive part and projector system and radiator portion; The led light source drive part comprises successively an end of the current rectifying and wave filtering circuit 1 that connects, high frequency transformer 2 elementary windings, to secondary winding, rectifier filter circuit 3; The output of rectifier filter circuit 3 connects constant-current control circuit 4, power factor correction and control circuit 5 successively, the other end to high frequency transformer 2 elementary windings, another road of the output of current rectifying and wave filtering circuit 1 connects the input D of compensating circuit 6, and its output E meets the internal multiplier M in power factor correction and the control circuit 5; The draw bail of compensating circuit 6 is that its input D one road connecting resistance R1, resistance R 2, resistance R 3 are output E to ground between resistance R 2 and the resistance R 3, and connect capacitor C 1 to ground; One road connecting resistance R5, resistance R 6 connects the negative pole of voltage-stabiliser tube D1 to ground between resistance R 5 and the resistance R 6, its positive pole connects capacitor C 2 to ground, and connects the base stage of triode Q1, and its collector electrode connecting resistance R4 is to output E, its grounded emitter.
The invention has the beneficial effects as follows that simple in structure, cost is low, load is high, conversion efficiency height, power factor height, harmonic current are low, constant current control, wide input voltage range, the life-span is long, reliability is high, low, the energy-conserving and environment-protective of temperature; Be applicable to various led light source projector.
Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is a compensating circuit schematic diagram among the present invention;
Fig. 3 is LED current-voltage characteristic curve figure.
Embodiment
The present invention is further described below in conjunction with embodiment.
As Fig. 1,2, high-efficiency and low-harmonic LED optical projection engine driving power supply comprises led light source drive part and projector system and radiator portion; The led light source drive part comprises successively an end of the current rectifying and wave filtering circuit 1 that connects, high frequency transformer 2 elementary windings, to secondary winding, rectifier filter circuit 3; The output of rectifier filter circuit 3 connects constant-current control circuit 4, power factor correction and control circuit 5 successively, the other end to high frequency transformer 2 elementary windings, another road of the output of current rectifying and wave filtering circuit 1 connects the input D of compensating circuit 6, and its output E meets the internal multiplier M in power factor correction and the control circuit 5; The draw bail of compensating circuit 6 is that its input D one road connecting resistance R1, resistance R 2, resistance R 3 are output E to ground between resistance R 2 and the resistance R 3, and connect capacitor C 1 to ground; One road connecting resistance R5, resistance R 6 connects the negative pole of voltage-stabiliser tube D1 to ground between resistance R 5 and the resistance R 6, its positive pole connects capacitor C 2 to ground, and connects the base stage of triode Q1, and its collector electrode connecting resistance R4 is to output E, its grounded emitter.
The alternating current 220V input connects current rectifying and wave filtering circuit 1, divide two-way through the voltage behind the rectifying and wave-filtering, one the road to high frequency transformer 2, one the road to compensating circuit 6, compensating circuit 6 connects power factor correction and control circuit 5, make its more accurate work, high frequency transformer 2 is subjected to the control of power factor correction and control circuit 5, high frequency transformer 3 connects rectifier filter circuit 3, its output termination constant-current control circuit 4 arrives the other end of the elementary winding of high frequency transformer 2, through after the rectifier filter circuit 3 again to power factor correction and control circuit 5, be direct current constant current voltage, be 7 power supplies of LED lamp group.As shown in Figure 1.
The draw bail of compensating circuit 6 is that its input D one road connecting resistance R1, resistance R 2, resistance R 3 are output E to ground between resistance R 2 and the resistance R 3, and connect capacitor C 1 to ground; One road connecting resistance R5, resistance R 6 connects the negative pole of voltage-stabiliser tube D1 to ground between resistance R 5 and the resistance R 6, its positive pole connects capacitor C 2 to ground, and connects the base stage of triode Q1, and its collector electrode connecting resistance R4 is to output E, its grounded emitter.As shown in Figure 2.
The input D of compensating circuit 6 connects the output of current rectifying and wave filtering circuit 1, the output E of compensating circuit 6 connects the internal multiplier M in power factor correction and the control circuit 5, adjust the resistance of resistance R 1, R2, R3, making the A point voltage is about 2V when input voltage is low, when input voltage rises, rises on A point, B point voltage are also followed, this moment, D1 punctured, the C point voltage rises, and triode Q1 conducting descends the A point voltage and still maintains about 2V.The A point connects output E, connect the internal multiplier M in power factor correction and the control circuit 5 again, by this circuit compensation, input voltage is to the control of internal multiplier M input, thereby the assurance power supply keeps the High Power Factor low harmonic current in than wide range input voltage.
Power factor correction and control circuit 5 are integration module, and model is FAN7527B.
Projector's power supply power supply is divided into two parts, i.e. led light source drive part and projector system, radiator portion.
Electric current, change in voltage characteristic (see figure 3) according to LED learn that the small forward voltage variation of LED can cause the great variety of electric current, and the curve on the left side is the red LED light source characteristic among Fig. 3, and the right curve is the White LED light source characteristic; So the LED lamp needs constant current drive mode could guarantee its useful life, consolidate invention and adopt constant current output.This part power accounts for 70% of projection gross power in addition, need to increase power factor correction, the present invention adopts single-level power factor correction to add constant current control, both guaranteed High Power Factor, guarantee high efficiency again, also guaranteed the useful life of LED lamp group, the offset current harmonic wave reduces the pollution to electrical network simultaneously.
The circuit of projector system and radiator portion is: the alternating current 220V input connects current rectifying and wave filtering circuit 8, high frequency transformer 9 elementary windings successively to secondary winding, rectifier filter circuit 10, its output termination constant-voltage control circuit 12 arrives PDM keyer 11 again; The output of current rectifying and wave filtering circuit 8 also links to each other with the input of PDM keyer 11; Be output as dc constant voltage voltage through after the rectifier filter circuit 10, be projector system 13 and radiator portion 14 power supplies.See Fig. 1 lower part.
Projector system and radiator portion power supply are for constant voltage output, and with the steady operation of assurance system and radiator portion, no-voltage fluctuates.Adopt the ON time of pulse width modulator (PWM) control field effect transistor (MOS), on high frequency transformer, produce the signal of a high frequency, step-down rectifier filtering then, constant voltage control section sampled signal is controlled output voltage simultaneously, makes it invariable.This circuit dynamic response is fast, and adjusting function is good, output voltage stabilization, and the variation with input voltage, load size does not change, and has guaranteed the stability of projector system work.
Claims (2)
1. a high-efficiency and low-harmonic LED optical projection engine driving power supply comprises led light source drive part and projector system and radiator portion; The led light source drive part comprises successively an end of the current rectifying and wave filtering circuit (1) that connects, the elementary winding of high frequency transformer (2), to secondary winding, rectifier filter circuit (3); The output of rectifier filter circuit (3) connects constant-current control circuit (4) successively, power factor correction and control circuit (5), the other end to the elementary winding of high frequency transformer (2), it is characterized in that, another road of the output of current rectifying and wave filtering circuit (1) connects the input (D) of compensating circuit (6), its output (E) connects the internal multiplier (M) in power factor correction and the control circuit (5), the draw bail of compensating circuit (6) is, its input (D) one road connecting resistance (R1), resistance (R2), resistance (R3) is to ground, between resistance (R2) and the resistance (R3) is output (E), and connects electric capacity (C1) to ground; One road connecting resistance (R5), resistance (R6) are to ground, connect the negative pole of voltage-stabiliser tube (D1) between resistance (R5) and the resistance (R6), its positive pole connects electric capacity (C2) to ground, and connects the base stage of triode (Q1), its collector electrode connecting resistance (R4) is to output (E), its grounded emitter.
2. high-efficiency and low-harmonic LED optical projection engine driving power supply according to claim 1 is characterized in that, described power factor correction and control circuit (5) are integration module, and model is FAN7527B.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010126146A CN101801135A (en) | 2010-03-17 | 2010-03-17 | High-efficiency and low-harmonic LED optical projection engine driving power supply |
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| CN201010126146A CN101801135A (en) | 2010-03-17 | 2010-03-17 | High-efficiency and low-harmonic LED optical projection engine driving power supply |
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| CN201010126146A Pending CN101801135A (en) | 2010-03-17 | 2010-03-17 | High-efficiency and low-harmonic LED optical projection engine driving power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102711337A (en) * | 2012-06-15 | 2012-10-03 | 开源集成电路(苏州)有限公司 | Light-emitting diode (LED) driving system |
| CN104753325A (en) * | 2013-12-31 | 2015-07-01 | 欧普照明股份有限公司 | Boost-buck type direct current converting circuit |
| CN118042674A (en) * | 2024-04-11 | 2024-05-14 | 广东东菱电源科技有限公司 | Non-isolation topological current slope compensation circuit |
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2010
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| JP2000195693A (en) * | 1998-12-28 | 2000-07-14 | Toshiba Lighting & Technology Corp | Discharge lamp lighting device, lighting system and projector device |
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|---|---|---|---|---|
| CN102711337A (en) * | 2012-06-15 | 2012-10-03 | 开源集成电路(苏州)有限公司 | Light-emitting diode (LED) driving system |
| CN102711337B (en) * | 2012-06-15 | 2014-09-17 | 开源集成电路(苏州)有限公司 | Light-emitting diode (LED) driving system |
| CN104753325A (en) * | 2013-12-31 | 2015-07-01 | 欧普照明股份有限公司 | Boost-buck type direct current converting circuit |
| CN104753325B (en) * | 2013-12-31 | 2017-11-10 | 欧普照明股份有限公司 | A kind of step-down/up type DC transfer circuit |
| CN118042674A (en) * | 2024-04-11 | 2024-05-14 | 广东东菱电源科技有限公司 | Non-isolation topological current slope compensation circuit |
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Application publication date: 20100811 |