CN102638916A - LED (Light-Emitting Diode) lamp and isolation trigger type LED drive circuit - Google Patents
LED (Light-Emitting Diode) lamp and isolation trigger type LED drive circuit Download PDFInfo
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- CN102638916A CN102638916A CN2011100379809A CN201110037980A CN102638916A CN 102638916 A CN102638916 A CN 102638916A CN 2011100379809 A CN2011100379809 A CN 2011100379809A CN 201110037980 A CN201110037980 A CN 201110037980A CN 102638916 A CN102638916 A CN 102638916A
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- triode
- drive circuit
- factor correction
- power factor
- correction chip
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Abstract
The invention discloses an LED (Light-Emitting Diode) lamp and an isolation trigger type LED drive circuit. The drive circuit is characterized in that a positive-polarity output end of a rectifying module is connected with a power input pin of a power factor correction chip through a first resistor, a transformer auxiliary winding is further connected with the power input pin through a second resistor and a first diode which are connected in series, a triode is connected between the first resistor and the power input pin of the power factor correction chip, a collector electrode of the triode is connected with the first resistor, an emitter electrode of the triode is connected with the power input pin, a third resistor is connected between the base electrode and collector electrode of the triode, the base electrode of the triode and the negative-polarity end of the rectifying module are connected with an MOS (Metal Oxide Semiconductor) transistor, the base electrode of the triode is connected with a drain electrode of the MOS transistor, a fourth resistor is connected between a grid electrode of the MOS transistor and an oblique wave pin of the power factor correction chip, and the source electrode of the MOS transistor is connected with the negative-polarity end of the rectifying module. The isolation trigger type LED drive circuit disclosed by the invention has great significance in increasing the luminous efficiency of the LED lamp, reducing loss, saving energy and reducing emission.
Description
Technical field
The present invention relates to a kind of drive circuit, relate in particular to a kind of isolation trigger-type led drive circuit, also relate to a kind of LED light fixture with this isolation trigger-type led drive circuit.
Background technology
Light-emitting diode (light-emitting diode is called for short LED) is as a kind of luminescent device, because its energy conservation characteristic has been widely used in lighting field.Constant current source power supply is adopted in the power supply of LED usually; In order to improve the fail safe of led drive circuit; The isolated drive circuit of the general employing of led drive circuit; This isolated drive circuit comprises transformer, but the existing more non-isolated drive circuit of isolated drive circuit loss that such comprises transformer is big.
Fig. 1 is the partial structurtes sketch map of the isolation trigger-type led drive circuit of prior art; Shown in it; The isolation trigger-type led drive circuit of prior art comprises rectification module 1, power factor correction chip (Power Factor Correction; Be called for short PFC) 3, the auxiliary winding 2 of transformer; The positive polarity output terminal of rectification module 1 is connected in the power supply input pin Vcc of power factor correction chip 3 through resistance R 1; The positive polarity output terminal of the auxiliary winding 2 of transformer is through the resistance R 2 of series connection successively, the power supply input pin Vcc that diode D1 also is connected in power factor correction chip 3, and the anode of this diode D1 is connected in resistance R 2, and the negative electrode of diode D1 is connected in the power supply input pin Vcc of power factor correction chip 3.Power factor correction chip 3 is supplied power to power supply input pin Vcc through resistance R 1 by rectification module 1 when energising just, is supplied power to power supply input pin Vcc through resistance R 2, diode D1 by the auxiliary winding 2 of transformer after the operate as normal.After the operate as normal, though the auxiliary winding 2 of transformer has been given the power supply input pin Vcc end power supply of power factor correction chip 3, rectification module 1 is still supplied power to power input Vcc through resistance R 1.Therefore just caused the resistance loss on the resistance R 1 like this, caused the loss of whole drive circuit, efficient is lower.
Summary of the invention
The object of the present invention is to provide a kind of LED light fixture of isolating the trigger-type led drive circuit and having this isolation trigger-type led drive circuit, to solve the existing problem that the loss of trigger-type led drive circuit is big, efficient has much room for improvement of isolating.
In order to realize the object of the invention; Isolation trigger-type led drive circuit provided by the invention comprises rectification module, power factor correction chip, the auxiliary winding of transformer; The positive polarity output terminal of said rectification module is connected in the power supply input pin of said power factor correction chip through one first resistance; The positive polarity output terminal of the auxiliary winding of said transformer is through one second resistance of series connection successively, the power supply input pin that one first diode also is connected in said power factor correction chip; And the anode of said first diode is connected in said second resistance; The negative electrode of said first diode is connected in the power supply input pin of said power factor correction chip, wherein, also connects a triode between the power supply input pin of said first resistance and said power factor correction chip; The collector electrode of said triode is connected in said first resistance; The emitter of said triode is connected in the power supply input pin of said power factor correction chip, connects one the 3rd resistance between the base stage of said triode and the collector electrode, connects a metal-oxide-semiconductor between the negative polarity output of the base stage of said triode and said rectification module; And the base stage of said triode is connected in the drain electrode of said metal-oxide-semiconductor; The negative polarity output of said rectification module is connected in the source electrode of said metal-oxide-semiconductor, and the grid of said metal-oxide-semiconductor is connected in the oblique wave pin of said power factor correction chip through one the 4th resistance, and the power supply input pin of said power factor correction chip is also through a capacity earth.
According to a kind of preferred implementation of above-mentioned isolation trigger-type led drive circuit, wherein, said triode is a NPN type triode.
According to a kind of preferred implementation of above-mentioned isolation trigger-type led drive circuit, wherein, said metal-oxide-semiconductor is a N channel enhancement metal-oxide-semiconductor.
According to a kind of preferred implementation of above-mentioned isolation trigger-type led drive circuit, wherein, the emitter of said triode is connected in the anode of one second diode, and the negative electrode of said second diode is connected in the power supply input pin of said power factor correction chip.
According to a kind of preferred implementation of above-mentioned isolation trigger-type led drive circuit, wherein, said power factor correction chip is LD7591.
In order to realize the object of the invention, LED light fixture provided by the invention includes drive circuit, and said drive circuit be above-mentioned isolation trigger-type led drive circuit one of them.
The present invention utilizes a simple peripheral circuit to replace the existing resistance of giving the power factor correction chip power supply in the trigger-type led drive circuit of isolating.The present invention who makes gives the power factor correction chip power supply in initial start stage through peripheral circuit, and the power factor correction chip is by the auxiliary winding power supply of transformer after the operate as normal, and peripheral circuit quits work, the current cut-off that flows through, and loss reduces.The loss of whole like this drive circuit is just smaller, has avoided the electric energy loss on the sub-resistance of existing drive circuit middle part, has improved the efficient that drives electrical equipment.
Description of drawings
Fig. 1 is the partial structurtes sketch map of the isolation trigger-type led drive circuit of prior art;
Fig. 2 isolates the partial structurtes sketch map of trigger-type led drive circuit preferred embodiment for the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is explained further details.
Fig. 2 isolates the partial structurtes sketch map of trigger-type led drive circuit preferred embodiment for the present invention; Shown in it; The present invention isolates trigger-type led drive circuit preferred embodiment and comprises rectification module 21, power factor correction chip 23, the auxiliary winding 22 of transformer, resistance R 21-R24, diode D1-D2, capacitor C, triode Q1, metal oxide semiconductor field effect tube (Metal-Oxide-Semiconductor Field-Effect Transistor is called for short metal-oxide-semiconductor) Q2.
The positive polarity output terminal of rectification module 21 is connected in an end of resistance R 21; The other end of resistance R 21 is connected in an end of resistance R 23 and the collector electrode of triode Q1; The base stage of triode Q1 is connected in the drain electrode of the other end and the metal-oxide-semiconductor Q2 of resistance R 23; Resistance R 24 is connected in the grid of metal-oxide-semiconductor Q2 and the oblique wave pin of power factor correction chip 23 (is the RAMP pin; Also be referred to as sawtooth waveforms and produce pin) between the RA; The negative polarity output of the source electrode of metal-oxide-semiconductor Q2 and rectification module 21 is connected, and the emitter of triode Q1 is connected in the power supply input pin Vcc of power factor correction chip 23 through a diode D22, and this power supply input pin Vcc also is connected in ground through a capacitor C.The positive polarity output terminal of the auxiliary winding 22 of transformer is through the resistance R 22 of series connection successively, the power supply input pin Vcc that diode D21 also is connected in power factor correction chip 23; And the anode of diode D21 is connected in resistance R 22, and the negative electrode of diode D21 is connected in the power supply input pin Vcc of power factor correction chip 23.Diode D22 is alternative configuration, also promptly in other embodiments, can make the emitter of triode Q1 be directly connected in the power supply input pin of power factor correction chip.
In the preferred embodiment of the present invention, triode Q1 and metal-oxide-semiconductor Q2 can be respectively NPN type triode, N channel enhancement metal-oxide-semiconductor, but the present invention is not limited to this.Further be that power factor correction chip 23 is LD7591 alternatively, this power factor correction chip 23 also can be LD7660, LD7860 and other ability normal working chip (like pwm chip, the light modulation chip) etc. of need supplying power certainly.
The running of isolation trigger-type led drive circuit preferred embodiment shown in Figure 2 is: rectification module 21 becomes ac voltage rectifier pulsating dc voltage and for triode Q1 trigger voltage is provided through resistance R 21 current limlitings, resistance R 23 dividing potential drops after energized; The direction of the pulsating direct current electric current after the triode Q1 conducting rectification is resistance R 21 → triode Q1 → diode D22 → power supply input pin VCC; Simultaneously capacitor C is charged; After power supply input pin Vcc voltage reaches the unlatching threshold voltage of power factor correction chip 23; Power factor correction chip 23 starts, and the oblique wave pin RA output high level of power factor correction chip 23 and through resistance R 24 current limlitings is for the grid of metal-oxide-semiconductor Q2 provides continuous trigger signal; The trigger voltage that after the metal-oxide-semiconductor Q2 conducting resistance R 23 is provided for triode Q1 pulls down to ground; Triode Q1 no longer is 23 power supplies of power factor correction chip through resistance R 21 by, the pulsating voltage after the rectification, reaches the power loss that reduces resistance R 21 and improves overall efficiency.Power factor correction chip 23 provides power supply by the auxiliary winding 22 of transformer; The high-frequency ac current that the auxiliary winding 22 of transformer produces passes through resistance R 22 current limlitings → D21 rectification → capacitor C filtering → power input Vcc successively; Thereby realize being 23 power supplies of power factor correction chip only, avoid electric energy loss unnecessary on the resistance R 21 through the auxiliary winding of transformer.
Through test, to compare with resistance R 21 is lossy always after the existing isolation trigger-type led drive circuit startup shown in Figure 1, the efficient of entire circuit plate has improved more than 5 percentage points, reaches 92% at least.
Bright isolation trigger-type led drive circuit preferred embodiment shown in Figure 2 can be applied to LED light fixture and other products that needs isolating chip of any model.
To sum up; The present invention makes the present invention to supply power for the power supply input pin of power factor correction chip through peripheral circuit at the circuit start initial stage, after the operate as normal through increasing a simple peripheral circuit; The power supply input pin of power factor correction chip is by the auxiliary winding power supply of transformer; This peripheral circuit quits work, the current cut-off that flows through, and loss reduces.Therefore the present invention to the light efficiency that improves light fixture, reduce the wastage, energy-saving and emission-reduction are significant.In addition, the present invention also has simple in structure, dependable performance, advantage of low manufacturing cost.
Can know that by technological general knowledge the present invention can realize through other the embodiment that does not break away from its spirit or essential feature.Therefore, above-mentioned disclosed embodiment with regard to each side, all just illustrates, and is not only.All within the scope of the present invention or the change in being equal to scope of the present invention all comprised by the present invention.
Claims (6)
1. isolate the trigger-type led drive circuit for one kind; Comprise rectification module, power factor correction chip, the auxiliary winding of transformer; The positive polarity output terminal of said rectification module is connected in the power supply input pin of said power factor correction chip through one first resistance; The positive polarity output terminal of the auxiliary winding of said transformer is through one second resistance of series connection successively, the power supply input pin that one first diode also is connected in said power factor correction chip; And the anode of said first diode is connected in said second resistance; The negative electrode of said first diode is connected in the power supply input pin of said power factor correction chip, it is characterized in that, also connects a triode between the power supply input pin of said first resistance and said power factor correction chip; The collector electrode of said triode is connected in said first resistance; The emitter of said triode is connected in the power supply input pin of said power factor correction chip, connects one the 3rd resistance between the base stage of said triode and the collector electrode, connects a metal-oxide-semiconductor between the negative polarity output of the base stage of said triode and said rectification module; And the base stage of said triode is connected in the drain electrode of said metal-oxide-semiconductor; The negative polarity output of said rectification module is connected in the source electrode of said metal-oxide-semiconductor, and the grid of said metal-oxide-semiconductor is connected in the oblique wave pin of said power factor correction chip through one the 4th resistance, and the power supply input pin of said power factor correction chip is also through a capacity earth.
2. isolation trigger-type led drive circuit according to claim 1 is characterized in that, said triode is a NPN type triode.
3. isolation trigger-type led drive circuit according to claim 1 is characterized in that, said metal-oxide-semiconductor is a N channel enhancement metal-oxide-semiconductor.
4. isolation trigger-type led drive circuit according to claim 1 is characterized in that the emitter of said triode is connected in the anode of one second diode, and the negative electrode of said second diode is connected in the power supply input pin of said power factor correction chip.
5. isolation trigger-type led drive circuit according to claim 1 is characterized in that said power factor correction chip is LD7591.
6. a LED light fixture comprises drive circuit, it is characterized in that, said drive circuit is the arbitrary described isolation trigger-type led drive circuit of claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100379809A CN102638916A (en) | 2011-02-11 | 2011-02-11 | LED (Light-Emitting Diode) lamp and isolation trigger type LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100379809A CN102638916A (en) | 2011-02-11 | 2011-02-11 | LED (Light-Emitting Diode) lamp and isolation trigger type LED drive circuit |
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| CN102638916A true CN102638916A (en) | 2012-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100379809A Pending CN102638916A (en) | 2011-02-11 | 2011-02-11 | LED (Light-Emitting Diode) lamp and isolation trigger type LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111385942A (en) * | 2019-11-12 | 2020-07-07 | 浙江凯耀照明有限责任公司 | LED lamp driving circuit capable of improving PF value |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200705812A (en) * | 2005-07-29 | 2007-02-01 | Leadtrend Tech Corp | Multi-function active circuit of PWM chip |
| TW200838114A (en) * | 2007-03-09 | 2008-09-16 | Leadtrend Tech Corp | Switching-mode power converter and pulse-width-modulation control circuit for primary-side feedback control |
| CN101873736A (en) * | 2009-04-24 | 2010-10-27 | 辉芒微电子（深圳）有限公司 | LED (light-emitting diode) drive circuit |
| CN202035179U (en) * | 2011-02-11 | 2011-11-09 | 厦门普为光电科技有限公司 | LED lamp and isolation triggering LED driving circuit thereof |
-
2011
- 2011-02-11 CN CN2011100379809A patent/CN102638916A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200705812A (en) * | 2005-07-29 | 2007-02-01 | Leadtrend Tech Corp | Multi-function active circuit of PWM chip |
| TW200838114A (en) * | 2007-03-09 | 2008-09-16 | Leadtrend Tech Corp | Switching-mode power converter and pulse-width-modulation control circuit for primary-side feedback control |
| CN101873736A (en) * | 2009-04-24 | 2010-10-27 | 辉芒微电子（深圳）有限公司 | LED (light-emitting diode) drive circuit |
| CN202035179U (en) * | 2011-02-11 | 2011-11-09 | 厦门普为光电科技有限公司 | LED lamp and isolation triggering LED driving circuit thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111385942A (en) * | 2019-11-12 | 2020-07-07 | 浙江凯耀照明有限责任公司 | LED lamp driving circuit capable of improving PF value |
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Application publication date: 20120815 |