CN203734902U - LED constant-current drive circuit - Google Patents
LED constant-current drive circuit Download PDFInfo
- Publication number
- CN203734902U CN203734902U CN201420146514.3U CN201420146514U CN203734902U CN 203734902 U CN203734902 U CN 203734902U CN 201420146514 U CN201420146514 U CN 201420146514U CN 203734902 U CN203734902 U CN 203734902U
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- module
- controller
- transformer
- drive circuit
- led constant
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- 238000001914 filtration Methods 0.000 claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000000087 stabilizing effect Effects 0.000 claims description 15
- 239000004065 semiconductor Substances 0.000 claims description 11
- 230000005611 electricity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The utility model provides an LED constant-current drive circuit, and relates to an LED drive circuit. The LED constant-current drive circuit comprises a dimming module, a rectifying module, a filtering module, a transformer T and a constant-current output module that are connected with each other in sequence, and further comprises a control module and a controller power supply module, wherein the control module is used for controlling the make-and-break of a primary coil of the transformer T, and comprises a controller U1; the controller power supply module is used for taking electricity from the primary coil of the transformer T to supply power to the controller U1; when the control module controls the primary coil of the transformer T to be turn-off, the controller power supply module supplies power to the controller U1. According to the LED constant-current drive circuit, a leakage inductance consumption module of the conventional LED constant-current drive circuit is removed, and simultaneously the controller power supply module is additionally arranged to lead energy of leakage inductance of the transformer T to the controller U1 in order to supply power to the controller U1, so that the LED constant-current drive circuit effectively utilizes the energy of the leakage inductance of the transformer T, and the corner energy of the leakage inductance of the transformer T is effectively utilized.
Description
Technical field
The utility model relates to a kind of LED drive circuit, is specifically related to a kind of LED constant-current drive circuit.
Background technology
Existing LED constant-current drive circuit as shown in Figure 1, it comprises light-adjusting module 1, rectification module 2, filtration module 3, transformer T and the constant current output module 4 connecting successively, also comprise the control module 5 for the break-make of the primary coil of control transformer T, constant current output module 4 is connected with the first secondary coil of transformer T, control module 5 is connected to obtain output feedback signal with the second subprime coil of transformer T, and control module 5 comprises controller U1.During startup, controller U1 obtains startup electric energy via resistance R 3 from the output of filtration module 3, and after startup, controller U1 moves required electric energy and by the second subprime coil of transformer T, via diode D8, supplied.Energy for eliminating transformer T leakage inductance, as shown in Figure 1, existing LED constant-current drive circuit is also provided with leakage inductance consumable module 8, leakage inductance consumable module 8 is connected to the two ends of the primary coil of transformer T, leakage inductance consumable module 8 comprises diode D7, capacitor C 9 and resistance R 12, after the primary coil of control module 5 control transformer T disconnects, the leakage inductance energy of transformer T just generates heat and consumes in resistance R 12 via diode D7.Like this, the leakage inductance of transformer T is not only consumed in vain and causes energy waste by resistance R 12, to improving the efficiency of described drive circuit, have no to help, and resistance R 12 consume transformer T leakage inductance time the heat that produces also raised the temperature of described drive circuit, heat radiation of the LED lamp that this drives described drive circuit is disadvantageous.
Summary of the invention
For the problems referred to above of prior art, the utility model provides a kind of can effectively utilize transformer T leakage inductance, improves the efficiency of drive circuit, reduces the LED constant-current drive circuit of the temperature of drive circuit simultaneously.
For achieving the above object, the utility model provides following technical scheme.
LED constant-current drive circuit, comprise light-adjusting module, rectification module, filtration module, transformer T, constant current output module and control module, control module comprises controller U1, civil power is inputted from light-adjusting module, after light-adjusting module adjustment, form dim signal, this dim signal is via rectification module, after filtration module and transformer T, forming LED constant current drives signal to export from constant current output module, constant current output module is connected with the first secondary coil of transformer T, control module is obtained startup electric energy from the output of filtration module, from the output of rectification module, obtain described dim signal, from the second subprime coil of transformer T, obtain output feedback signal, control module produces the break-make of primary coil of break-make control signal control transformer T so that described LED constant current drives the value of signal to maintain desired value according to described dim signal and output feedback signal, this LED constant-current drive circuit also comprises for the primary coil power taking from transformer T with the controller supply module to controller U1 power supply, the primary coil of control module control transformer T disconnects Time Controller supply module and powers to controller U1.
Wherein, controller supply module comprises capacitor C 7, resistance R 4, voltage stabilizing didoe D1, two utmost point D2 and diode D3, after capacitor C 7, resistance R 4 and diode D3 series connection, be connected between one end and controller U1 of primary coil of transformer T, capacitor C 7 connection transformer T, diode D3 connects controller U1, in parallel with resistance R 4 after voltage stabilizing didoe D1 and diode D2 series connection, ground connection after the positive pole of the positive pole of voltage stabilizing didoe D1 and diode D2 is connected.
Wherein, the model of controller U1 is FL7730, control module also comprises when stopping at controller supply module powering to controller U1 to the storage capacitor C5 of controller U1 power supply with for the metal-oxide-semiconductor Q1 of the primary coil of conducting/disconnection transformer T, No. 5 pin of controller U1 obtains described dim signal from the output of rectification module, No. 6 pin obtains output feedback signal from the second subprime coil of transformer T, No. 4 pin meets storage capacitor C5, No. 4 pin obtains startup electric energy from the output of filtration module, No. 4 pin is from the power taking of controller supply module, metal-oxide-semiconductor Q1 controlled end connects No. 2 pin of controller U1, two conduction terminal connect respectively primary coil and the ground of transformer T.
Wherein, this LED constant-current drive circuit also comprises over-voltage protection module, and over-voltage protection module is connected with constant current output module.
Wherein, over-voltage protection module comprises voltage stabilizing didoe D6, and the two ends of voltage stabilizing didoe D6 are connected with two outputs of constant current output module respectively.
The beneficial effects of the utility model are: LED constant-current drive circuit of the present utility model is removed the leakage inductance consumable module of existing LED constant-current drive circuit, set up controller supply module guides the energy of transformer T leakage inductance into controller U1 and comes to its power supply simultaneously, therefore LED constant-current drive circuit of the present utility model has effectively utilized the energy of transformer T leakage inductance, utilize this corner of transformer T leakage inductance energy to be effectively utilized, improved the efficiency of LED constant-current drive circuit of the present utility model, simultaneously because the energy of transformer T leakage inductance is not by resistance consumption heat-dissipating, so reduced the temperature of LED constant-current drive circuit of the present utility model.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of existing LED constant-current drive circuit.
Fig. 2 is the circuit theory schematic diagram of LED constant-current drive circuit of the present utility model.
Reference numeral comprises: light-adjusting module 1, rectification module 2, filtration module 3, constant current output module 4, control module 5, controller supply module 6, over-voltage protection module 7, leakage inductance consumable module 8.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.
As shown in Figure 2, LED constant-current drive circuit of the present utility model, comprise light-adjusting module 1, rectification module 2, filtration module 3, transformer T, constant current output module 4 and control module 5, control module 5 comprises controller U1, civil power is from light-adjusting module 1 input, after adjusting, light-adjusting module 1 forms dim signal, this dim signal is via rectification module 2, after filtration module 3 and transformer T, forming LED constant current drives signal from 4 outputs of constant current output module, constant current output module 4 is connected with the first secondary coil of transformer T, control module 5 is obtained startup electric energy from the output of filtration module 3, from the output of rectification module 2, obtain described dim signal, from the second subprime coil of transformer T, obtain output feedback signal, control module 5 produces the break-make of primary coil of break-make control signal control transformer T so that described LED constant current drives the value of signal to maintain desired value according to described dim signal and output feedback signal, LED constant-current drive circuit of the present utility model also comprises for the controller supply module 6 to controller U1 power supply, controller supply module 6 is connected between one end and controller U1 of primary coil of transformer T, the primary coil of control module 5 control transformer T disconnect Time Controller supply module 6 just from the primary coil power taking of transformer T to power to controller U1, 6 of the primary coil conducting Time Controller supply modules of control module 5 control transformer T stop powering to controller U1.
In the present embodiment, particularly, controller supply module 6 comprises capacitor C 7, resistance R 4, voltage stabilizing didoe D1, two utmost point D2 and diode D3, after capacitor C 7, resistance R 4 and diode D3 series connection, be connected between one end and controller U1 of primary coil of transformer T, capacitor C 7 connection transformer T, diode D3 connects controller U1, in parallel with resistance R 4 after voltage stabilizing didoe D1 and diode D2 series connection, ground connection after the positive pole of the positive pole of voltage stabilizing didoe D1 and diode D2 is connected.The model of controller U1 is FL7730, control module 5 also comprises when stopping at controller supply module 6 powering to controller U1 to the storage capacitor C5 of controller U1 power supply with for the metal-oxide-semiconductor Q1 of the primary coil of conducting/disconnection transformer T, No. 5 pin of controller U1 obtains described dim signal from the output of rectification module 2, No. 6 pin obtains output feedback signal from the second subprime coil of transformer T, No. 4 pin meets storage capacitor C5, No. 4 pin obtains startup electric energy from the output of filtration module 3, No. 4 pin is from 6 power takings of controller supply module, metal-oxide-semiconductor Q1 controlled end connects No. 2 pin of controller U1, two conduction terminal connect respectively primary coil and the ground of transformer T.As shown in Figure 1, when LED constant-current drive circuit of the present utility model starts, controller U1 obtains startup electric energy via resistance R 3 from the output of filtration module 3, after startup, controller U1 obtains described dim signal via resistance R 6 and resistance R 5 from the output of rectification module 2, via capacitor C 6, resistance R 11 and resistance R 12 are obtained described output feedback signal from the second subprime coil of transformer T, then according to described dim signal and output feedback signal, produce break-make control signal and this break-make control signal is transferred to the controlled end of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1 is according to this conducting of break-make control signal or cut-off, thereby realize the control to the break-make of the primary coil of transformer T.During metal-oxide-semiconductor Q1 cut-off, the primary coil of transformer T disconnects, and now the electric energy of transformer T leakage inductance is just powered to controller U1 via capacitor C 7, resistance R 4 and diode D3, gives storage capacitor C5 charging simultaneously; During metal-oxide-semiconductor Q1 conducting, capacitor C 7, metal-oxide-semiconductor Q1 and diode D2 form loop to capacitor C 7 electric discharges, and storage capacitor C5 gives controller U1 power supply, so circulation.
Because controller U1 is no longer from the second subprime coil power taking of transformer T; and transformer T leakage inductance might not reflect the variation of the voltage of constant current output module 4 outputs; so the over-voltage protection function of existing LED constant-current drive circuit as shown in Figure 1 may lose efficacy; so possess over-voltage protection function in order to ensure LED constant-current drive circuit of the present utility model; LED constant-current drive circuit of the present utility model is provided with over-voltage protection module 7; as shown in Figure 2, over-voltage protection module 7 is connected with constant current output module 4.In the present embodiment, particularly, over-voltage protection module 7 comprises voltage stabilizing didoe D6, and the two ends of voltage stabilizing didoe D6 are connected with two outputs of constant current output module 4 respectively.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection range; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (5)
1.LED constant-current drive circuit, comprise light-adjusting module, rectification module, filtration module, transformer T, constant current output module and control module, control module comprises controller U1, civil power is inputted from light-adjusting module, after light-adjusting module adjustment, form dim signal, this dim signal is via rectification module, after filtration module and transformer T, forming LED constant current drives signal to export from constant current output module, constant current output module is connected with the first secondary coil of transformer T, control module is obtained startup electric energy from the output of filtration module, from the output of rectification module, obtain described dim signal, from the second subprime coil of transformer T, obtain output feedback signal, control module produces the break-make of primary coil of break-make control signal control transformer T so that described LED constant current drives the value of signal to maintain desired value according to described dim signal and output feedback signal, it is characterized in that: also comprise for the primary coil power taking from transformer T with the controller supply module to controller U1 power supply, the primary coil of control module control transformer T disconnects Time Controller supply module and powers to controller U1.
2. LED constant-current drive circuit according to claim 1, it is characterized in that: controller supply module comprises capacitor C 7, resistance R 4, voltage stabilizing didoe D1, two utmost point D2 and diode D3, after capacitor C 7, resistance R 4 and diode D3 series connection, be connected between one end and controller U1 of primary coil of transformer T, capacitor C 7 connection transformer T, diode D3 connects controller U1, in parallel with resistance R 4 after voltage stabilizing didoe D1 and diode D2 series connection, ground connection after the positive pole of the positive pole of voltage stabilizing didoe D1 and diode D2 is connected.
3. LED constant-current drive circuit according to claim 1, it is characterized in that: the model of controller U1 is FL7730, control module also comprises when stopping at controller supply module powering to controller U1 to the storage capacitor C5 of controller U1 power supply with for the metal-oxide-semiconductor Q1 of the primary coil of conducting/disconnection transformer T, No. 5 pin of controller U1 obtains described dim signal from the output of rectification module, No. 6 pin obtains output feedback signal from the second subprime coil of transformer T, No. 4 pin meets storage capacitor C5, No. 4 pin obtains startup electric energy from the output of filtration module, No. 4 pin is from the power taking of controller supply module, metal-oxide-semiconductor Q1 controlled end connects No. 2 pin of controller U1, two conduction terminal connect respectively primary coil and the ground of transformer T.
4. LED constant-current drive circuit according to claim 3, is characterized in that: this LED constant-current drive circuit also comprises over-voltage protection module, and over-voltage protection module is connected with constant current output module.
5. LED constant-current drive circuit according to claim 4, is characterized in that: over-voltage protection module comprises voltage stabilizing didoe D6, and the two ends of voltage stabilizing didoe D6 are connected with two outputs of constant current output module respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420146514.3U CN203734902U (en) | 2014-03-28 | 2014-03-28 | LED constant-current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420146514.3U CN203734902U (en) | 2014-03-28 | 2014-03-28 | LED constant-current drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203734902U true CN203734902U (en) | 2014-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420146514.3U Expired - Lifetime CN203734902U (en) | 2014-03-28 | 2014-03-28 | LED constant-current drive circuit |
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| Country | Link |
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| CN (1) | CN203734902U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104378887A (en) * | 2014-11-21 | 2015-02-25 | 成都芯源系统有限公司 | Led drive circuit and control method thereof |
-
2014
- 2014-03-28 CN CN201420146514.3U patent/CN203734902U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104378887A (en) * | 2014-11-21 | 2015-02-25 | 成都芯源系统有限公司 | Led drive circuit and control method thereof |
| CN104378887B (en) * | 2014-11-21 | 2016-11-30 | 成都芯源系统有限公司 | Led drive circuit and control method thereof |
| TWI583257B (en) * | 2014-11-21 | 2017-05-11 | 茂力科技股份有限公司 | Led driving circuit and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140723 |