CN102438377A - LED (Light Emitting Diode) constant-current driving circuit with high power factor - Google Patents

LED (Light Emitting Diode) constant-current driving circuit with high power factor Download PDF

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Publication number
CN102438377A
CN102438377A CN2011104303283A CN201110430328A CN102438377A CN 102438377 A CN102438377 A CN 102438377A CN 2011104303283 A CN2011104303283 A CN 2011104303283A CN 201110430328 A CN201110430328 A CN 201110430328A CN 102438377 A CN102438377 A CN 102438377A
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CN
China
Prior art keywords
unit
switch element
power factor
transformer isolation
constant
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Pending
Application number
CN2011104303283A
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Chinese (zh)
Inventor
李文昌
袁进
于廷江
黄国辉
温强
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Chengdu Chengdian Guihai Science & Technology Co Ltd
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Chengdu Chengdian Guihai Science & Technology Co Ltd
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Priority to CN2011104303283A priority Critical patent/CN102438377A/en
Publication of CN102438377A publication Critical patent/CN102438377A/en
Pending legal-status Critical Current

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses an LED (Light Emitting Diode) constant-current driving circuit with a high power factor, which relates to the electronic technology. The LED constant-current driving circuit comprises a power input unit, a rectification filtering unit, a transformer isolation unit and an output unit and is characterized by also comprising a PFC (Power Factor Correction) charge pump unit arranged between the rectification filtering unit and the transformer isolation unit. According to the LED constant-current driving circuit, conversion efficiency is improved, and component temperature rise is lowered so as to prolong the service life.

Description

High power factor LED constant-current drive circuit
Technical field
The present invention relates to electronic technology.
Background technology
Because having advantages such as environmental protection, energy-conservation, life-span length, high brightness, LED is regarded as the 21 century lighting source, in order to satisfy the requirement of LED self character, so the LED constant-current driving power supply is assented and given birth to; At present in the application of LED constant-current driving power supply; Can it be divided into two series products; One is non-isolation LED constant-current driving power supply, and this type of power supply is mainly used in indoor LED fluorescent tube, and all the other occasions are seldom used basically; The shortcoming of this type of power supply is it and imports and not isolation of the electric property of exporting, so on safety standard, be short of to some extent; Another kind of this type of power supply is because input is thoroughly isolated through transformer with the electric property of output in order to isolate the LED constant-current driving power supply, and its use occasion is omnibearing, is applied to the driving of various LED, is the upgrades of non-insulating power supply; Isolate the LED driving power in the design and use process, all hope to obtain High Power Factor, reduce the input current harmonics and pollute; Common method is to adopt active correction at present; Promptly use special-purpose power factor correction chip, the advantage of this scheme is to obtain higher power factor, and shortcoming is that the cost of circuit raises; Costing an arm and a leg of special-purpose PFC correcting chip increased circuit cost.Obviously in the general application of LED driving power, under the situation that realizes identical function and performance, guarantee the stability of circuit, lower cost lets cost performance obtain higher embodiment, could let the popularization of LED and application more wide.
Summary of the invention
Technical problem to be solved by this invention is, provide a kind of can, make into the end electric current and form sine wave, improve the LED constant-current drive circuit of power factor.
The technical scheme that the present invention solve the technical problem employing is; High power factor LED constant-current drive circuit; Comprise power input unit, rectification filtering unit, transformer isolation unit and output unit, also comprise a PFC charge pump unit that is arranged between rectification filtering unit and the transformer isolation unit.
Further, the present invention also comprises:
The EMI filter unit is between power input unit and rectification filtering unit;
PWM constant current control unit is connected with rectification filtering unit, also is connected to the transformer isolation unit through switch element;
Current sampling unit is connected with PWM constant current control unit;
Voltage feedback unit is arranged between transformer isolation unit and the PWM constant current control unit;
Switch element is connected with current sampling unit with PWM constant current control unit, transformer isolation unit.
Further; Said PFC charge pump unit comprises second inductance L 2, the 4th capacitor C 4 and the first diode D1; Second inductance L 2 and the first diode D1 are series between rectification filtering unit and the transformer isolation unit; The tie point of second inductance L 2 and the first diode D1 connects the input of switch element through the 4th capacitor C 4, and the negative pole of the first diode D1 connects the input of switch element through the elementary winding of transformer isolation unit; The output termination electric current of switch element adopts unit, the control termination PWM constant current control unit of switch element.
Said PWM constant current control unit comprises control IC, and the Vcc termination voltage feedback unit of control IC connects, the tie point of Vin termination second inductance L 2 and the first diode D1; The Vin end is also through the tenth capacitor C 10 ground connection; The COMP end is through the 8th resistance R 8 ground connection of voltage feedback unit, and the COMP end is also through the 9th capacitor C 9 ground connection, and the CS end is through the 7th electric capacity R7 ground connection; Output holds the control end that connects switch element through the 4th resistance R 4, and switch element is a metal-oxide-semiconductor.
The invention has the beneficial effects as follows, utilize the EMI filter unit effectively to suppress the electromagnetic interference of constant-current supply, thereby make power supply meet electromagnetic radiation harassing and wrecking and the disturbance voltage standard of GB17743-2007; The power factor of utilizing PFC charge pump unit to improve constant-current supply makes PF >=0.8, has effectively reduced current harmonics, makes power supply meet the Electro Magnetic Compatibility standard of GB17625.1; Improved conversion efficiency, η >=78%, conversion efficiency improves, and has reduced the components and parts temperature rise, thereby has improved useful life; Constant current output, line regulation are less than ± 3%, and load regulation is less than ± 3%, thereby it is more stable that LED is worked; Under the situation of identical realization power factor, reduced cost, the popularization that makes LED use is more extensive.
Description of drawings
Fig. 1 is the simplification schematic diagram of the novel realization High Power Factor of the present invention.
Fig. 2 absorbs the simplification schematic diagram of circuit for existing RCD.
Fig. 3 is the structure chart of novel high-power factor LED constant-current driving power supply of the present invention.
Fig. 4 is the circuit diagram of novel high-power factor LED constant-current driving power supply of the present invention.The figure chips can adopt likes the watt IW1692 of company chip.
Embodiment
The present invention proposes a kind of novel passive single-stage high-power rate factor correcting circuit----charge pump high power factor correction; The characteristics of this circuit are to utilize the electric capacity charge pump principle of boosting, and make voltage on the dc filter capacitor be higher than the peak value of input ac voltage, in the device for power switching handoff procedure; The difference of utilizing load current and going into to hold electric current is to the charge pump capacitor charge and discharge; Make into the end electric current and form sine wave, improved power factor, simplified circuit structure; Improve circuit stability, reduced circuit cost.
The present invention includes following part:
1, power input.
2, the EMI filter unit that links to each other with power input.
3, the rectification filtering unit that links to each other with the EMI filter unit.
4, the PFC charge pump unit that links to each other with rectification filtering unit, and be connected to the transformer isolation unit.
5, the PWM constant current control unit generation control signal that links to each other with rectification filtering unit is connected to switch element, and switch element is controlled the conversion that transformer is stored and releases energy according to its conducting with turn-offing.
6, the output unit that links to each other with the transformer isolation unit, and be connected to the LED load.
7, current sampling unit that is connected with PWM constant current control unit with switch element, current sampling unit is gathered the current signal on the former limit of transformer and is delivered to PWM constant current control unit; PWM constant current control unit is controlled said switch element periodically conducting and shutoff according to said current signal output rectangular pulse switching signal, realizes the output of size of current.
8, voltage feedback unit that is connected with PWM constant current control unit with the transformer isolation unit; The voltage feedback unit of telling is the error signal of gathering the auxiliary winding two ends of transformer; Deliver to PWM constant current control unit and count contrast, realize the constant output of electric current by chip internal.
Referring to Fig. 1~3.
Suppose that AC-input voltage is 230V, when metal-oxide-semiconductor Q1 conducting, drain voltage is jumped from about the 600V and is dropped to zero, and the primary inductance of transformer T1 begins charging, and primary current is linear to rise; In the time of conducting, the reduction of drain voltage also can be sent on the tie point between second inductance L 2 and the first diode D1, so the voltage of this point drops near 200V from 400V through the 4th capacitor C 4.Because the existence of alternating voltage is arranged, and the electric current that flows through choke (second inductance L 2) can progressively rise, and to 4 chargings of the 4th capacitor C; After charging stage of transformer and choke accomplished, metal-oxide-semiconductor Q1 converted into and ends, and drain current is zero, and the voltage on drain voltage and the 4th capacitor C 4 can sharply rise, and equated to be about 400V up to the voltage of the 4th capacitor C 4 with the voltage of the 5th capacitor C 5.After this drain voltage changes into slowly and climbing; It is constant that the voltage of the 4th capacitor C 4 and the 5th capacitor C 5 then maintains 400V; Meanwhile, the electric current on second inductance L 2 (it is to 4 chargings of the 4th capacitor C at first) changes into through the first diode D1 and flowing in the 5th capacitor C 5, and this makes the energy that lies in second inductance L 2 transfer in the 5th capacitor C 5; Utilize this principle, just make input current flow to higher the 5th capacitor C 5 places from the 4th lower capacitor C 4.
The effect of second inductance L 2 is to avoid the pulse current significantly that produces behind the AC rectification being arranged to 4 chargings of the 4th capacitor C after the metal-oxide-semiconductor conducting; The first diode D1 blocks the 5th capacitor C 5 (filter capacitor) and the 4th capacitor C 4 (charging capacitor) and since have blocking-up effect institute so that the waveform on second inductance L 2 near sine wave; The 4th capacitor C 4 is to utilize the electric capacity of low-voltage to 5 chargings of the 5th capacitor C, and the choosing value of the 4th capacitor C 4 is between nF~10nF, and the choosing value microfarad rank electric capacity of the 5th capacitor C 5 is selected according to power, and the choosing value of second inductance L 2 is in the milihenry rank.
Compared with prior art (like Fig. 2) utilizes the PFC charge pump circuit to replace RCD in the past and absorbs circuit, because the PFC charge pump circuit not only has the PFC function; Electrical source power factor is reached more than 0.8; And have the absorption pooling feature concurrently, therefore no longer need RCD to absorb circuit, and owing to there has not been RCD to absorb the resistance components in the circuit; So do not contain power consumption, thereby improved the operating efficiency of complete machine.

Claims (4)

1. high power factor LED constant-current drive circuit; Comprise power input unit, rectification filtering unit, transformer isolation unit and output unit; It is characterized in that, also comprise a PFC charge pump unit that is arranged between rectification filtering unit and the transformer isolation unit.
2. high power factor LED constant-current drive circuit as claimed in claim 1 is characterized in that, also comprises:
The EMI filter unit is between power input unit and rectification filtering unit;
PWM constant current control unit is connected with rectification filtering unit, also is connected to the transformer isolation unit through switch element;
Current sampling unit is connected with PWM constant current control unit;
Voltage feedback unit is arranged between transformer isolation unit and the PWM constant current control unit;
Switch element is connected with current sampling unit with PWM constant current control unit, transformer isolation unit.
3. high power factor LED constant-current drive circuit as claimed in claim 2; It is characterized in that; Said PFC charge pump unit comprises second inductance (L2), the 4th electric capacity (C4) and first diode (D1); Second inductance (L2) and first diode (D1) are series between rectification filtering unit and the transformer isolation unit; The tie point of second inductance (L2) and first diode (D1) connects the input of switch element through the 4th electric capacity (C4), and the negative pole of first diode (D1) connects the input of switch element through the elementary winding of transformer isolation unit; The output termination electric current of switch element adopts unit, the control termination PWM constant current control unit of switch element.
4. high power factor LED constant-current drive circuit as claimed in claim 3 is characterized in that, said PWM constant current control unit comprises control IC; The Vcc termination voltage feedback unit of control IC connects; The tie point of Vin termination second inductance (L2) and first diode (D1), Vin end are also through the tenth electric capacity (C10) ground connection, and the COMP end is through the 8th resistance (R8) ground connection of voltage feedback unit; The COMP end is also through the 9th electric capacity (C9) ground connection; The CS end is through the 7th electric capacity (R7) ground connection, and Output holds the control end that connects switch element through the 4th resistance (R4), and switch element is a metal-oxide-semiconductor.
CN2011104303283A 2011-12-20 2011-12-20 LED (Light Emitting Diode) constant-current driving circuit with high power factor Pending CN102438377A (en)

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Application Number Priority Date Filing Date Title
CN2011104303283A CN102438377A (en) 2011-12-20 2011-12-20 LED (Light Emitting Diode) constant-current driving circuit with high power factor

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
GB2503316A (en) * 2012-06-22 2013-12-25 O2Micro Inc Circuits and methods for driving light sources
CN103856077A (en) * 2012-12-06 2014-06-11 东林科技股份有限公司 Passive power factor correcting AC/DC conversion device and power factor correcting circuit action method
US8866398B2 (en) 2012-05-11 2014-10-21 O2Micro, Inc. Circuits and methods for driving light sources
US9232591B2 (en) 2008-12-12 2016-01-05 O2Micro Inc. Circuits and methods for driving light sources
US9253843B2 (en) 2008-12-12 2016-02-02 02Micro Inc Driving circuit with dimming controller for driving light sources
US9386653B2 (en) 2008-12-12 2016-07-05 O2Micro Inc Circuits and methods for driving light sources
CN110119177A (en) * 2018-02-07 2019-08-13 珠海市一微半导体有限公司 A kind of integrated circuit and its power circuit of low pressure manufacturing process

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9232591B2 (en) 2008-12-12 2016-01-05 O2Micro Inc. Circuits and methods for driving light sources
US9253843B2 (en) 2008-12-12 2016-02-02 02Micro Inc Driving circuit with dimming controller for driving light sources
US9386653B2 (en) 2008-12-12 2016-07-05 O2Micro Inc Circuits and methods for driving light sources
US8866398B2 (en) 2012-05-11 2014-10-21 O2Micro, Inc. Circuits and methods for driving light sources
GB2503316A (en) * 2012-06-22 2013-12-25 O2Micro Inc Circuits and methods for driving light sources
GB2503316B (en) * 2012-06-22 2015-10-14 O2Micro Inc Circuits and methods for driving light sources
CN103856077A (en) * 2012-12-06 2014-06-11 东林科技股份有限公司 Passive power factor correcting AC/DC conversion device and power factor correcting circuit action method
CN103856077B (en) * 2012-12-06 2016-12-21 东林科技股份有限公司 The method of operating of the power factor correction circuit of passive type power factor correction function DC-AC conversion device
CN110119177A (en) * 2018-02-07 2019-08-13 珠海市一微半导体有限公司 A kind of integrated circuit and its power circuit of low pressure manufacturing process

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Application publication date: 20120502