CN202035179U - LED lamp and isolation triggering LED driving circuit thereof - Google Patents
LED lamp and isolation triggering LED driving circuit thereof Download PDFInfo
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- CN202035179U CN202035179U CN2011200384802U CN201120038480U CN202035179U CN 202035179 U CN202035179 U CN 202035179U CN 2011200384802 U CN2011200384802 U CN 2011200384802U CN 201120038480 U CN201120038480 U CN 201120038480U CN 202035179 U CN202035179 U CN 202035179U
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- triode
- factor correction
- power factor
- power supply
- correction chip
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Abstract
The utility model relates to an LED lamp and an isolation triggering LED driving circuit thereof. In the driving circuit, a positive polarity output terminal of a rectification module is connected with a power supply input pin of a power factor correction chip, a transformer auxiliary winding is also connected with the power supply input pin via a second resistor and a first diode, which are in serial connection, a triode is connected between a first resistor and the power supply 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 supply input pin, a third resistor is connected between a base electrode and the collector electrode of the triode, the base electrode of the triode and a negative polarity terminal of the rectification module are connected to an MOS tube, the base electrode of the triode is connected with a drain electrode of the MOS tube, a fourth resistor is connected between a grid electrode of the MOS tube and an oblique wave pin of the power factor correction chip, and a source electrode of the MOS tube is connected with the negative polarity terminal of the rectification module. The driving circuit has substantial importance for improving luminous efficiency of the LED lamp, reducing loss, and saving energy and reducing emission.
Description
Technical field
The utility model relates to a kind of drive circuit, relates in particular to a kind of isolation trigger-type led drive circuit, also relates 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 schematic diagram of the isolation trigger-type led drive circuit of prior art, as 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, transformer is assisted winding 2, the positive polarity output terminal of rectification module 1 is connected in the power supply input pin Vcc of power factor correction chip 3 by resistance R 1, the resistance R 2 of positive polarity output terminal by connecting successively of the auxiliary winding 2 of transformer, diode D1 also is connected in the power supply input pin Vcc of power factor correction chip 3, 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 powered to power supply input pin Vcc by resistance R 1 by rectification module 1 when energising just, is powered to power supply input pin Vcc by 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 powered to power input Vcc by 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.
The utility model content
The purpose of this utility model 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 purpose of this utility model, the isolation trigger-type led drive circuit that the utility model provides comprises rectification module, the power factor correction chip, transformer is assisted winding, the positive polarity output terminal of described rectification module is connected in the power supply input pin of described power factor correction chip by one first resistance, one second resistance of positive polarity output terminal by connecting successively of the auxiliary winding of described transformer, one first diode also is connected in the power supply input pin of described power factor correction chip, and the anode of described first diode is connected in described second resistance, the negative electrode of described first diode is connected in the power supply input pin of described power factor correction chip, wherein, also connect a triode between the power supply input pin of described first resistance and described power factor correction chip, the collector electrode of described triode is connected in described first resistance, the emitter of described triode is connected in the power supply input pin of described power factor correction chip, connect one the 3rd resistance between the base stage of described triode and the collector electrode, connect a metal-oxide-semiconductor between the negative polarity output of the base stage of described triode and described rectification module, and the base stage of described triode is connected in the drain electrode of described metal-oxide-semiconductor, the negative polarity output of described rectification module is connected in the source electrode of described metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor is connected in the oblique wave pin of described power factor correction chip by one the 4th resistance, and the power supply input pin of described power factor correction chip is also by a capacity earth.
According to a kind of preferred implementation of above-mentioned isolation trigger-type led drive circuit, wherein, described triode is a NPN type triode.
According to a kind of preferred implementation of above-mentioned isolation trigger-type led drive circuit, wherein, described 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 described triode is connected in the anode of one second diode, and the negative electrode of described second diode is connected in the power supply input pin of described power factor correction chip.
According to a kind of preferred implementation of above-mentioned isolation trigger-type led drive circuit, wherein, described power factor correction chip is LD7591.
In order to realize the purpose of this utility model, the LED light fixture that the utility model provides includes drive circuit, and described drive circuit be above-mentioned isolation trigger-type led drive circuit one of them.
The utility model 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 utility model that makes is given the power factor correction chip power supply in initial start stage by 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 schematic diagram of the isolation trigger-type led drive circuit of prior art;
Fig. 2 isolates the partial structurtes schematic diagram of trigger-type led drive circuit preferred embodiment for the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further details.
Fig. 2 isolates the partial structurtes schematic diagram of trigger-type led drive circuit preferred embodiment for the utility model, as shown in it, the utility model is isolated trigger-type led drive circuit preferred embodiment and is comprised 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, the emitter of triode Q1 is connected in the power supply input pin Vcc of power factor correction chip 23 by a diode D22, and this power supply input pin Vcc also is connected in ground by a capacitor C.The positive polarity output terminal of the auxiliary winding 22 of transformer is by 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 utility model preferred embodiment, triode Q1 and metal-oxide-semiconductor Q2 can be respectively NPN type triode, N channel enhancement metal-oxide-semiconductor, but the utility model 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 (as pwm chip, the light modulation chip) etc. of need powering 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 passes through resistance R 21 current limlitings after energized, resistance R 23 dividing potential drops provide trigger voltage for triode Q1, 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, the oblique wave pin RA output high level of power factor correction chip 23 also passes through resistance R 24 current limlitings, 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 by, pulsating voltage after the rectification no longer is 23 power supplies of power factor correction chip through resistance R 21, 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 by the auxiliary winding of transformer.
After tested, 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 utility model is by increasing a simple peripheral circuit, make the utility model can give the power supply input pin power supply of power factor correction chip by peripheral circuit at the circuit start initial stage, after the operate as normal, 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 utility model to the light efficiency that improves light fixture, reduce the wastage, energy-saving and emission-reduction are significant.In addition, the utility model also has simple in structure, dependable performance, advantage of low manufacturing cost.
As known by the technical knowledge, the utility model can be realized by other the embodiment that does not break away from its spirit or essential feature.All in the utility model scope or the change that is being equal in the scope of the present utility model all be included in the utility model.
Claims (6)
1. isolate the trigger-type led drive circuit for one kind, comprise rectification module, the power factor correction chip, transformer is assisted winding, the positive polarity output terminal of described rectification module is connected in the power supply input pin of described power factor correction chip by one first resistance, one second resistance of positive polarity output terminal by connecting successively of the auxiliary winding of described transformer, one first diode also is connected in the power supply input pin of described power factor correction chip, and the anode of described first diode is connected in described second resistance, the negative electrode of described first diode is connected in the power supply input pin of described power factor correction chip, it is characterized in that, also connect a triode between the power supply input pin of described first resistance and described power factor correction chip, the collector electrode of described triode is connected in described first resistance, the emitter of described triode is connected in the power supply input pin of described power factor correction chip, connect one the 3rd resistance between the base stage of described triode and the collector electrode, connect a metal-oxide-semiconductor between the negative polarity output of the base stage of described triode and described rectification module, and the base stage of described triode is connected in the drain electrode of described metal-oxide-semiconductor, the negative polarity output of described rectification module is connected in the source electrode of described metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor is connected in the oblique wave pin of described power factor correction chip by one the 4th resistance, and the power supply input pin of described power factor correction chip is also by a capacity earth.
2. isolation trigger-type led drive circuit according to claim 1 is characterized in that, described triode is a NPN type triode.
3. isolation trigger-type led drive circuit according to claim 1 is characterized in that, described 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 described triode is connected in the anode of one second diode, and the negative electrode of described second diode is connected in the power supply input pin of described power factor correction chip.
5. isolation trigger-type led drive circuit according to claim 1 is characterized in that described power factor correction chip is LD7591.
6. a LED light fixture comprises drive circuit, it is characterized in that, described 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 |
|---|---|---|---|
| CN2011200384802U CN202035179U (en) | 2011-02-11 | 2011-02-11 | LED lamp and isolation triggering LED driving circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200384802U CN202035179U (en) | 2011-02-11 | 2011-02-11 | LED lamp and isolation triggering LED driving circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN202035179U true CN202035179U (en) | 2011-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200384802U Expired - Lifetime CN202035179U (en) | 2011-02-11 | 2011-02-11 | LED lamp and isolation triggering LED driving circuit thereof |
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| CN (1) | CN202035179U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638916A (en) * | 2011-02-11 | 2012-08-15 | 厦门普为光电科技有限公司 | LED (Light-Emitting Diode) lamp and isolation trigger type LED drive circuit |
-
2011
- 2011-02-11 CN CN2011200384802U patent/CN202035179U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638916A (en) * | 2011-02-11 | 2012-08-15 | 厦门普为光电科技有限公司 | LED (Light-Emitting Diode) lamp and isolation trigger type LED drive circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111109 |
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| CX01 | Expiry of patent term | ||
| DD01 | Delivery of document by public notice |
Addressee: Li Xiaohui Document name: Notice of expiration of patent right |
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| DD01 | Delivery of document by public notice |