CN203136240U - Wide-range constant-current LED power supply VCC drive circuit - Google Patents
Wide-range constant-current LED power supply VCC drive circuit Download PDFInfo
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- CN203136240U CN203136240U CN 201220736949 CN201220736949U CN203136240U CN 203136240 U CN203136240 U CN 203136240U CN 201220736949 CN201220736949 CN 201220736949 CN 201220736949 U CN201220736949 U CN 201220736949U CN 203136240 U CN203136240 U CN 203136240U
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Abstract
The utility model discloses a wide-range constant-current LED power supply VCC drive circuit. An AC-DC conversion module converts AC commercial power into DC power and outputs the DC power to a DC bus; a PFC boost inductor L4 is connected on the DC bus and the rear end of the PFC boost inductor L4 is connected with a switch tube; a PWM module drives the switch tube to work and the DC power is converted into high frequency square waves through the switch tube; the high frequency square waves are inputted into an output transformer and then converted into DC power output after the transformation of the output transformer; the DC power output is utilized to supply power to an LED; a PFC module outputs a control signal to the PWM module; the PFC boost inductor L4 is additionally provided with an auxiliary winding; and output of the auxiliary winding is rectified through a first rectification filtering unit, goes through the voltage stabilization by a first voltage stabilization unit, and then is taken as a first path power supply circuit output VCC to supply power to the PWM module and the PFC module. The wide-range constant-current LED power supply VCC drive circuit is capable of enabling a power supply to work normally within an output range of 0V-CV(upper limit), solving the problem that the LED drive power supply is restricted by a constant current range, and increasing the versatility of the power supply.
Description
Technical field
The utility model discloses a kind of LED power circuit, particularly a kind of wide region constant-current LED power supply VCC drive circuit.
Background technology
Along with the development of LED lighting technology, LED periphery industry has also obtained the driving power industry of very big development, particularly LED illuminating product.At present, the LED power supply all drives with current constant mode, so the width of reference constant current directly influences the application of power supply in the LED light fixture.Because the VF value temperature influence of LED lamp alters a great deal, and when using, consider the flexibility of the quantity of LED lamp serial connection, so, the LED driving power is accomplished that wide region is most important concerning the LED light fixture, the seriation that it not only can reduce product has also strengthened the reliability of power supply in light fixture.In traditional LED driving power processing, tend to do a lot of articles made to order according to client's demand, tend to because order volume is few, various in style, and cause product not produce by batch, thereby strengthened the quality risk.Because the power supply of LED power supply VCC is taken from output transformer, when output voltage changed, VCC voltage was changing equally; if output voltage drops to when very low; the power supply of VCC just can not have been satisfied the demand of pwm driver, and will make power supply enter guard mode this moment, so the scope of constant current is limited to.
Summary of the invention
Narrower at the above-mentioned LED driving power VCC reference constant current of mentioning of the prior art, and a series of problems that produce, the utility model provides a kind of new wide region constant-current LED power supply VCC drive circuit, it increases secondary coil at the PFC inductance, power taking from the PFC inductance, power for simultaneously PFC module and PWM module with the power supply that the output transformer place obtains, make power supply not influenced by output voltage in the equal energy of output 0-CV upper limit operate as normal.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of wide region constant-current LED power supply VCC drive circuit, drive circuit comprises the AC-DC conversion module, the PWM module, PFC module and output transformer, the AC-DC conversion module converts electric main to direct current and exports dc bus to, PFC boost inductance L4 is connected on the dc bus, PFC boost inductance L4 rear end is connected with switching tube, the work of PWM module drive switching tube, convert direct current to high frequency square wave by switching tube, input to output transformer, after the output transformer transformation, convert direct current output again to, power to LED, PFC module output control signal is given the PWM module, have additional auxiliary winding on the PFC boost inductance L4, auxiliary winding output is after the first rectification filtering unit rectification, again through giving PWM module and PFC module for power supply as first via power supply circuits output VCC after the first voltage regulation unit voltage stabilizing.
The technical scheme that its technical problem that solves the utility model adopts further comprises:
Described first rectification filtering unit comprises capacitor C 10, diode D3, diode D2 and capacitor C 3, the auxiliary winding of setting up on the PFC boost inductance L4 is provided with two output lines, one of them direct ground connection, as negative pole, another output line is as positive pole, be serially connected with capacitor C 10 on the anodal output line, cross-over connection has diode D3 between anodal output line and the negative pole output line, be connected with diode D2 on the anodal output line, diode D2 exports to first voltage regulation unit, and diode D2 rear end is by capacitor C 3 ground connection.
Described first voltage regulation unit comprises triode Q1, resistance R 16, voltage-stabiliser tube ZD1, the collector and emitter of triode Q1 is serially connected on the DC leadout of first rectification filtering unit output, be connected with resistance R 16 between the collector electrode of triode Q1 and the base stage, the base stage of triode Q1 is by voltage-stabiliser tube ZD1 ground connection, and the emitter of triode Q1 output VCC powers to PWM.
Power taking on the secondary auxiliary winding of described output transformer, through the second rectification filtering unit filtering, and after the second voltage regulation unit voltage stabilizing, VCC powers to PWM as the output of second power supply circuits.
Be connected with between described first via power supply circuits and the second road power supply circuits and postpone voltage-stabiliser tube ZD2.
Described second rectification filtering unit comprises resistance R 87, diode D12 and capacitor C 35, resistance R 87 and diode D12 are connected in series on the output line of secondary auxiliary winding of output transformer, the secondary auxiliary winding output of output transformer is through current-limiting resistance R87 current limliting, after passing through diode D12 filtering again, by being connected capacitor C 35 rectifications between output line and the ground, form direct current, export to second voltage regulation unit.
Described second voltage regulation unit comprises triode Q5, resistance R 73 and voltage-stabiliser tube ZD7, the collector and emitter of triode Q5 is serially connected on the DC leadout of second rectification filtering unit output, be connected with resistance R 73 between the collector electrode of triode Q5 and the base stage, the base stage of triode Q5 is by voltage-stabiliser tube ZD7 ground connection, and the emitter of triode Q5 output VCC powers to PWM.
The beneficial effects of the utility model are: the utility model increases secondary coil at the PFC boost inductance, power taking from the PFC boost inductance, power for simultaneously PFC module and PWM module with the power supply that the output transformer place obtains, make power supply export all energy operate as normal of the 0-CV upper limit.Solve the limitation that the LED driving power is subjected to reference constant current, increased the versatility of product.
Below in conjunction with the drawings and specific embodiments the utility model is described further.
Description of drawings
Fig. 1 is the utility model workflow diagram.
Fig. 2 is the utility model core circuit theory diagrams.
Fig. 3 is the utility model integrated circuit schematic diagram.
Embodiment
Present embodiment is the utility model preferred implementation, and other all its principles are identical with present embodiment or approximate with basic structure, all within the utility model protection range.
Please referring to accompanying drawing 1; accompanying drawing 2 and accompanying drawing 3; LED power supply in the utility model mainly comprises the AC-DC conversion module; protection module; the PWM module; PFC module and output transformer; AC-DC conversion module and protection module adopt the module in the routine techniques; convert electric main to direct current and export dc bus to; PFC boost inductance L4 is connected on the dc bus; level is connected with switching tube behind the PFC boost inductance L4; the work of PWM module drive switching tube; convert direct current to high frequency square wave; input to output transformer; after the output transformer transformation; convert direct current output again to; power to LED; voltage; the current detection module output signal feeds back to the PFC module, gives the PWM module by PFC module output control signal, the power factor of control complete machine; said structure is the basic structure of the Switching Power Supply of routine, and this part-structure is with of the prior art identical in the utility model.
In the utility model; have additional an auxiliary winding at PFC boost inductance L4; the auxiliary winding out-put supply is exported VCC and is given PWM module and PFC module for power supply behind first rectification filtering unit and first voltage regulation unit; because the work of PFC module and the scope of output voltage do not contact especially; so; increase an auxiliary winding at PFC boost inductance L4; go up power taking as the VCC operating voltage of PWM module drive from PFC boost inductance L4; so can solve because of power taking on the output transformer as VCC voltage; and cause when VCC reduces, cause power supply to enter the defective of guard mode.Please emphasis referring to accompanying drawing 2, in the present embodiment, a direct ground connection in two output line terminal of the auxiliary winding of setting up on the PFC boost inductance L4, as negative pole, another output line is as positive pole, be serially connected with capacitor C 10 on the anodal output line, cross-over connection has diode D3 between anodal output line and the negative pole output line, be connected with diode D2 on the anodal output line, diode D2 rear end is by capacitor C 3 ground connection, capacitor C 10, diode D3, diode D2 and capacitor C 3 are formed first rectification filtering unit, convert the auxiliary winding out-put supply on the PFC boost inductance L4 to direct current output, first rectification filtering unit output DC to the first voltage regulation unit, in the present embodiment, first voltage regulation unit comprises triode Q1, resistance R 16, voltage-stabiliser tube ZD1, the collector and emitter of triode Q1 is serially connected on the DC leadout, be connected with resistance R 16 between the collector electrode of triode Q1 and the base stage, the base stage of triode Q1 is by voltage-stabiliser tube ZD1 ground connection, and the emitter of triode Q1 output VCC powers to PWM.
In the present embodiment, PWM module and PFC module also have one road power supply circuits, and its power taking on the secondary auxiliary winding of output transformer is powered to PWM through second rectification filtering unit and second voltage regulation unit.In the present embodiment, the secondary auxiliary winding one end ground connection of output transformer, the other end exports second rectification filtering unit to, second rectification filtering unit comprises resistance R 87, diode D12 and capacitor C 35, resistance R 87 and diode D12 are connected in series on the output line of secondary auxiliary winding of output transformer, the secondary auxiliary winding output of output transformer is through current-limiting resistance R87 current limliting, after passing through diode D12 filtering again, again by after being connected capacitor C 35 rectifications between output line and the ground, form direct current, export to second voltage regulation unit, in the present embodiment, second voltage regulation unit comprises triode Q5, resistance R 73 and voltage-stabiliser tube ZD7, the syndeton of second voltage regulation unit is identical with the syndeton of first voltage regulation unit, repeats no more herein.In the present embodiment, between first via power supply circuits and the second road power supply circuits, be connected with and postpone voltage-stabiliser tube ZD2, first via power supply circuits are given the PFC module for power supply earlier, give the PWM module for power supply again, the second road power supply circuits are given the PWM module for power supply earlier, give the PFC module for power supply again, postpone voltage-stabiliser tube ZD2 and be connected between PFC module for power supply interface and the PWM module for power supply interface.
The utility model in use, first via power supply circuits are after PFC boost inductance L4 power taking, at first give the PFC driver, when after the level pwm circuit start working after, the VCC voltage that output transformer feeds back is powered to PWM, also can power by the PFC driver simultaneously, when the VCC of output transformer power supply is lower than the reverse-conducting voltage of voltage-stabiliser tube ZD2, the power supply of pwm driver just begins power supply by the auxiliary winding of PFC boost inductance L4, has so just realized the constant current of output wide region.
The utility model increases secondary coil at the PFC inductance, and power taking from the PFC inductance powers for simultaneously PFC module and PWM module with the power supply that the output transformer place obtains, and makes the power supply can all can operate as normal in the output 0-CV upper limit.Solve the limitation that the LED driving power is subjected to reference constant current, increased the versatility of product.
Claims (7)
1. wide region constant-current LED power supply VCC drive circuit, drive circuit comprises the AC-DC conversion module, the PWM module, PFC module and output transformer, the AC-DC conversion module converts electric main to direct current and exports dc bus to, PFC boost inductance L4 is connected on the dc bus, PFC boost inductance L4 rear end is connected with switching tube, the work of PWM module drive switching tube, convert direct current to high frequency square wave by switching tube, input to output transformer, after the output transformer transformation, convert direct current output again to, power to LED, PFC module output control signal is given the PWM module, it is characterized in that: have additional auxiliary winding on the described PFC boost inductance L4, auxiliary winding output is after the first rectification filtering unit rectification, again through giving PWM module and PFC module for power supply as first via power supply circuits output VCC after the first voltage regulation unit voltage stabilizing.
2. wide region constant-current LED power supply VCC drive circuit according to claim 1, it is characterized in that: described first rectification filtering unit comprises capacitor C 10, diode D3, diode D2 and capacitor C 3, the auxiliary winding of setting up on the PFC boost inductance L4 is provided with two output lines, one of them direct ground connection, as negative pole, another output line is as positive pole, be serially connected with capacitor C 10 on the anodal output line, cross-over connection has diode D3 between anodal output line and the negative pole output line, be connected with diode D2 on the anodal output line, diode D2 exports to first voltage regulation unit, and diode D2 rear end is by capacitor C 3 ground connection.
3. wide region constant-current LED power supply VCC drive circuit according to claim 1, it is characterized in that: described first voltage regulation unit comprises triode Q1, resistance R 16, voltage-stabiliser tube ZD1, the collector and emitter of triode Q1 is serially connected on the DC leadout of first rectification filtering unit output, be connected with resistance R 16 between the collector electrode of triode Q1 and the base stage, the base stage of triode Q1 is by voltage-stabiliser tube ZD1 ground connection, and the emitter of triode Q1 output VCC powers to PWM.
4. according to claim 1 or 2 or 3 described wide region constant-current LED power supply VCC drive circuits, it is characterized in that: power taking on the secondary auxiliary winding of described output transformer, through the second rectification filtering unit filtering, and after the second voltage regulation unit voltage stabilizing, VCC powers to PWM as the output of second power supply circuits.
5. wide region constant-current LED power supply VCC drive circuit according to claim 4 is characterized in that: be connected with delay voltage-stabiliser tube ZD2 between described first via power supply circuits and the second road power supply circuits.
6. wide region constant-current LED power supply VCC drive circuit according to claim 4, it is characterized in that: described second rectification filtering unit comprises resistance R 87, diode D12 and capacitor C 35, resistance R 87 and diode D12 are connected in series on the output line of secondary auxiliary winding of output transformer, the secondary auxiliary winding output of output transformer is through current-limiting resistance R87 current limliting, after passing through diode D12 filtering again, by being connected capacitor C 35 rectifications between output line and the ground, form direct current, export to second voltage regulation unit.
7. wide region constant-current LED power supply VCC drive circuit according to claim 4, it is characterized in that: described second voltage regulation unit comprises triode Q5, resistance R 73 and voltage-stabiliser tube ZD7, the collector and emitter of triode Q5 is serially connected on the DC leadout of second rectification filtering unit output, be connected with resistance R 73 between the collector electrode of triode Q5 and the base stage, the base stage of triode Q5 is by voltage-stabiliser tube ZD7 ground connection, and the emitter of triode Q5 output VCC powers to PWM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220736949 CN203136240U (en) | 2012-12-28 | 2012-12-28 | Wide-range constant-current LED power supply VCC drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220736949 CN203136240U (en) | 2012-12-28 | 2012-12-28 | Wide-range constant-current LED power supply VCC drive circuit |
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| CN203136240U true CN203136240U (en) | 2013-08-14 |
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| CN 201220736949 Expired - Fee Related CN203136240U (en) | 2012-12-28 | 2012-12-28 | Wide-range constant-current LED power supply VCC drive circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715884A (en) * | 2014-01-09 | 2014-04-09 | 中国人民解放军海军工程大学 | Constant-current constant-voltage converter based on PWM |
| CN107453624A (en) * | 2017-07-26 | 2017-12-08 | 广州金升阳科技有限公司 | A kind of auxiliary power supply circuit |
| CN110086328A (en) * | 2019-06-19 | 2019-08-02 | 深圳莱福德科技股份有限公司 | Power-on time sequence control circuit |
| CN110913530A (en) * | 2019-10-30 | 2020-03-24 | 杭州优特电源有限公司 | Dimming LED driver |
-
2012
- 2012-12-28 CN CN 201220736949 patent/CN203136240U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103715884A (en) * | 2014-01-09 | 2014-04-09 | 中国人民解放军海军工程大学 | Constant-current constant-voltage converter based on PWM |
| CN103715884B (en) * | 2014-01-09 | 2017-03-29 | 中国人民解放军海军工程大学 | Constant-current constant-voltage convertor based on PWM |
| CN107453624A (en) * | 2017-07-26 | 2017-12-08 | 广州金升阳科技有限公司 | A kind of auxiliary power supply circuit |
| CN110086328A (en) * | 2019-06-19 | 2019-08-02 | 深圳莱福德科技股份有限公司 | Power-on time sequence control circuit |
| CN110086328B (en) * | 2019-06-19 | 2024-05-07 | 深圳莱福德科技股份有限公司 | Power-on time sequence control circuit |
| CN110913530A (en) * | 2019-10-30 | 2020-03-24 | 杭州优特电源有限公司 | Dimming LED driver |
| CN110913530B (en) * | 2019-10-30 | 2021-08-27 | 杭州优特电源有限公司 | Dimming LED driver |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20181228 |
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| CF01 | Termination of patent right due to non-payment of annual fee |