CN201365198Y - High-efficient series-parallel LED power supply - Google Patents
High-efficient series-parallel LED power supply Download PDFInfo
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- CN201365198Y CN201365198Y CNU2009200040592U CN200920004059U CN201365198Y CN 201365198 Y CN201365198 Y CN 201365198Y CN U2009200040592 U CNU2009200040592 U CN U2009200040592U CN 200920004059 U CN200920004059 U CN 200920004059U CN 201365198 Y CN201365198 Y CN 201365198Y
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Abstract
The utility model relates to a high-efficient series-parallel LED power supply, which sequentially comprises an EMI circuit, a PFC circuit, a PWM controller, a switch transformer, a DC output circuit and an LED lighting unit. Besides, a sampling feedback control circuit for sampling working current and voltage of the LED lighting unit is further arranged between the LED lighting unit and the PWM controller, the sampling feedback control circuit outputs control signals connected to the DC output circuit, the LED lighting unit comprises at least one LED lamp set, and each LED lamp set is provided with a consent current control circuit. The high-efficient series-parallel LED power supply has the advantages that by adding corresponding constant current control circuits while matching with the feedback control circuit to perform real-time self-adjustment on output of a power circuit on the basis of the existing LED power supply circuit, the power supply circuit can intelligently detect amount of LEDs connected to the sub-circuits thereof and adjust corresponding output voltage, and when the LEDs on the sub-circuits are damaged or reduced, the power supply circuit can realize self-adaptation to retain the same current as before, thereby guaranteeing working conversion efficiency of the integral circuit.
Description
[technical field]
The utility model relates to a kind of LED power supply, refers in particular to a kind of conversion efficiency height, is integrated with the series-parallel connection LED power supply unit of constant current control.
[background technology]
Along with going from strength to strength of LED industry, the every nook and cranny of people life is infiltrated in the use of LED gradually, and all LED can relate to the configuration power issue, LED a large amount of popularize with power supply unit design progressive inseparable.Yet make a general survey of LED electric power system at present and can only play effect usually into LED unit or array power supply, usually it is not equipped with the constant current controlled function of LED luminescence unit, this just causes electric power system can't conveniently regulate its output voltage in use, also limited its LED quantity that can connect, cause the inconvenience of actual use, and because the constant current of each branch line of lack of wisdomization control, in case LED luminescence unit of serial connection takes place partly to damage or be removed on it, then the conversion efficiency of whole power supply unit will sharply descend, loss increases greatly, waste many electric energy, very not environmental protection.
[summary of the invention]
The purpose of this utility model is to have overcome above-mentioned defective, a kind of conveniently adjusted electric power output voltage is provided and is combined with the LED power supply unit of constant-current control circuit.
The purpose of this utility model is achieved in that a kind of efficient series-parallel connection LED power supply unit, it comprises EMI circuit, pfc circuit, PWM controller, switch transformer, DC output circuit and LED luminescence unit successively, its improvements are: also be provided with the sampling feedback control circuit of the LED luminescence unit operating current/voltage that is used to sample between LED luminescence unit and PWM controller, sampling feedback control circuit is also exported control signal and is connected in the DC output circuit; Described LED luminescence unit comprises at least one paths of LEDs lamp group, is equipped with constant-current control circuit on the road of every paths of LEDs lamp group;
Described sampling feedback control circuit comprises sample circuit, comparison circuit and feedback control circuit successively; Described sample circuit input is connected in the constant-current control circuit of each paths of LEDs lamp group;
Described feedback control circuit output also connects the DC output circuit;
Described constant-current control circuit includes field-effect transistor, and field-effect transistor is serially connected with on each paths of LEDs lamp group branch road;
Described sample circuit includes the diode of current-limiting resistance and control forward conduction;
Include comparator in the described comparison circuit, be provided with variable resistor in comparator input terminal.
Than common LED power supply, the beneficial effects of the utility model are and will increase corresponding constant current control in original LED power circuit and cooperate the feedback control circuit that real-time self-adjusting is carried out in the output of power circuit, make circuit intelligence to detect and to regulate corresponding output voltage to the LED quantity that its branch road inserts, and when LED on the branch road is damaged or reduces, circuit can self adaptation be maintained to size before with electric current, thereby has guaranteed the work conversion efficiency of circuit integral body.
[description of drawings]
Below in conjunction with accompanying drawing in detail concrete structure of the present utility model is described in detail
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the circuit theory diagrams of the utility model specific embodiment.
Fig. 3 is the utility model specific embodiment intelligent control part circuit diagram.
[embodiment]
Below in conjunction with accompanying drawing the utility model specific embodiment is described in detail.
As shown in Figure 1, the utility model relates to a kind of efficient series-parallel connection LED power supply unit, it comprises traditional AC-DC part, the user can directly insert the civil power of 85-265V, the alternating current that inserts passes through the EMI circuit successively, pfc circuit, the PWM controller, switch transformer, DC output circuit output driving LED luminescence unit, can regulate energy consumption output automatically according to institute's series LED number for making power circuit, in traditional AC-DC circuit, also added the LED intelligence control circuit, this intelligence control circuit is by being provided with sampling feedback control circuit between LED luminescence unit and PWM controller, sampling feedback control circuit is used for operating current/voltage that sample circuit inserts the LED luminescence unit, and the output control signal is connected in the DC output circuit or thereby the PWM controller forms a control closed loop, corresponding, the LED luminescence unit can comprise at least one paths of LEDs lamp group in the circuit, and the Lu Shangjun in every paths of LEDs lamp group is provided with constant-current control circuit, constant-current control circuit is controlled the operating current of a paths of LEDs lamp group and is exported this paths of LEDs lamp group operating current/voltage to sampling feedback control circuit, the sampling feedback circuit compares according to sampled signal and internal reference, feed back to PWM controller or DC output circuit then and control the direct voltage of its integrated circuit output, thereby entire circuit can intelligent exporting according to the loading demand regulating circuit.
Referring to Fig. 2 is the utility model embodiment schematic block circuit diagram, sampling feedback control circuit is made up of sample circuit, comparison circuit and the feedback control circuit of cascade in the present embodiment, wherein obtain sampled signal in the constant-current control circuit of sample circuit by each LED lamp group branch road, so output drives the feedback control circuit after comparison circuit compares sampled signal and reference signal, thereby the feedback control circuit is controlled the PWM controller and adjusted its output.
As Fig. 3 is the circuit diagram of Fig. 2 embodiment schematic block circuit diagram correspondence, in view of the utility model technology can directly apply in original traditional AC-DC power circuit, so this circuit diagram has omitted original AC-DC power circuit part, sets forth the LED intelligence control circuit part of feature emphatically.As the figure upper right corner is 1-N paths of LEDs lamp group branch road, each branch road is in series with some LED lamps, on each branch road, also be serially connected with constant current control element field-effect transistor Q1-Qn, and form constant-current control circuit through resistance R s1-Rsn, R3 and comparator, comparator compares output signal to the voltage of going up induction through resistance R s1-Rsn and reference voltage V ref and goes to control the conducting degree of each branch road field-effect transistor Q1-Qn to keep branch current on design load.In addition, on each LED lamp group branch road, take out and be connected with sample circuit, sample circuit R1, D1 to Rn, Dn gives among the comparison circuit comparator VREF1 with the D terminal voltage of obtaining each branch road field-effect transistor Q1-Qn by the diode D1-Dn of forward conduction only then, the forward end input of comparator VREF1 connects reference generator U1, be parallel with variable resistor RV in the two ends of reference generator U1, whole thus power supply in use can artificially can be controlled circuit output voltage by adjusting this variable resistor RV, and is convenient and practical.Receive the voltage signal of field-effect transistor Q1-Qn as comparator VREF1 after, the reference generator U1 voltage of this signal and access is compared the PWM controller of the diode of back delivery outlet output signal feedback control circuit and photoelectrical coupler Coupling Control AC-DC feedback circuit to reach the purpose of control integrated circuit output voltage, thereby when the LED quantity that inserts in the circuit reduces, the degree of each branch road effect transistor Q1-Qn conducting weakens, its both end voltage raises thereupon, this high level is admitted to the inverting input of comparator VREF1 of comparison circuit and reference signal that forward end inserts compares, the current potential of comparator machine output reduces makes the optocoupler conducting enhancing of feedback control circuit and optocoupler feedback control PWM controller to adjust output voltage, finish the operation of intelligent control, whole process need not human intervention, uses energy-conservation and convenience.
It is to be noted; of the present utility modelly be not limited to above-mentioned execution mode; any simple modification, equivalent variations and modification that any those skilled in the art do the foregoing description in based on technical solutions of the utility model all belong in the protection range of the present utility model.
Claims (6)
1, a kind of efficient series-parallel connection LED power supply unit, it comprises EMI circuit, pfc circuit, PWM controller, switch transformer, DC output circuit and LED luminescence unit successively, it is characterized in that: also be provided with the sampling feedback control circuit of the LED luminescence unit operating current/voltage that is used to sample between LED luminescence unit and PWM controller, sampling feedback control circuit is also exported control signal and is connected in the PWM controller; Described LED luminescence unit comprises at least one paths of LEDs lamp group, is equipped with constant-current control circuit on the road of every paths of LEDs lamp group.
2, efficient series-parallel connection LED power supply unit as claimed in claim 1, it is characterized in that: described sampling feedback control circuit comprises sample circuit, comparison circuit and feedback control circuit successively; Described sample circuit input is connected in the constant-current control circuit of each paths of LEDs lamp group.
3, efficient series-parallel connection LED power supply unit as claimed in claim 1 is characterized in that: described feedback control circuit output also connects the DC output circuit.
4, efficient series-parallel connection LED power supply unit as claimed in claim 2, it is characterized in that: described constant-current control circuit includes field-effect transistor, and field-effect transistor is serially connected with on each paths of LEDs lamp group branch road.
5, efficient series-parallel connection LED power supply unit as claimed in claim 2 is characterized in that: described sample circuit includes the diode of current-limiting resistance and control forward conduction.
6, efficient series-parallel connection LED power supply unit as claimed in claim 2 is characterized in that: include comparator in the described comparison circuit, be provided with variable resistor in comparator input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200040592U CN201365198Y (en) | 2009-01-22 | 2009-01-22 | High-efficient series-parallel LED power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200040592U CN201365198Y (en) | 2009-01-22 | 2009-01-22 | High-efficient series-parallel LED power supply |
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| Publication Number | Publication Date |
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| CN201365198Y true CN201365198Y (en) | 2009-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009200040592U Expired - Lifetime CN201365198Y (en) | 2009-01-22 | 2009-01-22 | High-efficient series-parallel LED power supply |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101868094A (en) * | 2010-06-22 | 2010-10-20 | 海洋王照明科技股份有限公司 | LED driving circuit and LED lamp |
| CN102186288A (en) * | 2011-04-08 | 2011-09-14 | 深圳市中庆微科技开发有限公司 | Intelligent LED (Light Emitting Diode) driving chip |
| CN102264173A (en) * | 2010-05-31 | 2011-11-30 | 英飞特电子（杭州）有限公司 | LED (light emitting diode) constant current driving circuit and output-voltage-adjustable circuit |
| CN102752898A (en) * | 2011-04-01 | 2012-10-24 | 英飞特电子（杭州）股份有限公司 | Load drive circuit |
| CN103052203A (en) * | 2011-10-14 | 2013-04-17 | 欧司朗股份有限公司 | LED (Light Emitting Diode) control circuit and control method thereof |
| CN103209517A (en) * | 2012-01-11 | 2013-07-17 | 三星电子株式会社 | Apparatus And Method For Compensating For Current Deviation |
| 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 |
| CN105898951A (en) * | 2014-12-19 | 2016-08-24 | 毛昭祺 | Hybrid LED light adjustment control circuit |
| CN109982485A (en) * | 2019-04-16 | 2019-07-05 | 深圳市豪恩智能物联股份有限公司 | Constant current output adjusts circuit |
| CN112188677A (en) * | 2020-11-02 | 2021-01-05 | 东莞市擎洲光电科技有限公司 | Drive power supply circuit with high-power and high-current output |
| CN112419961A (en) * | 2019-08-20 | 2021-02-26 | 深圳市洲明科技股份有限公司 | Voltage-regulating energy-saving circuit and LED display module |
-
2009
- 2009-01-22 CN CNU2009200040592U patent/CN201365198Y/en not_active Expired - Lifetime
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8866409B2 (en) | 2010-05-31 | 2014-10-21 | Inventronics (Hangzhou), Inc. | Constant-current LED driver circuit and output voltage adjustable circuit and method thereof |
| CN102264173A (en) * | 2010-05-31 | 2011-11-30 | 英飞特电子（杭州）有限公司 | LED (light emitting diode) constant current driving circuit and output-voltage-adjustable circuit |
| CN102264173B (en) * | 2010-05-31 | 2013-11-06 | 英飞特电子（杭州）股份有限公司 | LED (light emitting diode) constant current driving circuit and output-voltage-adjustable circuit |
| CN101868094A (en) * | 2010-06-22 | 2010-10-20 | 海洋王照明科技股份有限公司 | LED driving circuit and LED lamp |
| CN101868094B (en) * | 2010-06-22 | 2014-02-12 | 海洋王照明科技股份有限公司 | LED driving circuit and LED lamp |
| CN102752898A (en) * | 2011-04-01 | 2012-10-24 | 英飞特电子（杭州）股份有限公司 | Load drive circuit |
| CN102186288A (en) * | 2011-04-08 | 2011-09-14 | 深圳市中庆微科技开发有限公司 | Intelligent LED (Light Emitting Diode) driving chip |
| CN102186288B (en) * | 2011-04-08 | 2015-07-08 | 浙江萤尔光电科技有限公司 | Intelligent LED (Light Emitting Diode) driving chip |
| US9370067B2 (en) | 2011-10-14 | 2016-06-14 | Osram Gmbh | LED control circuit and a controlling method of the same |
| CN103052203B (en) * | 2011-10-14 | 2015-06-24 | 欧司朗股份有限公司 | LED (Light Emitting Diode) control circuit and control method thereof |
| CN103052203A (en) * | 2011-10-14 | 2013-04-17 | 欧司朗股份有限公司 | LED (Light Emitting Diode) control circuit and control method thereof |
| CN103209517A (en) * | 2012-01-11 | 2013-07-17 | 三星电子株式会社 | Apparatus And Method For Compensating For Current Deviation |
| 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 |
| CN105898951A (en) * | 2014-12-19 | 2016-08-24 | 毛昭祺 | Hybrid LED light adjustment control circuit |
| CN109982485A (en) * | 2019-04-16 | 2019-07-05 | 深圳市豪恩智能物联股份有限公司 | Constant current output adjusts circuit |
| CN112419961A (en) * | 2019-08-20 | 2021-02-26 | 深圳市洲明科技股份有限公司 | Voltage-regulating energy-saving circuit and LED display module |
| CN112188677A (en) * | 2020-11-02 | 2021-01-05 | 东莞市擎洲光电科技有限公司 | Drive power supply circuit with high-power and high-current output |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20091216 |