CN202535588U - LED high-efficient constant-current driving power supply - Google Patents
LED high-efficient constant-current driving power supply Download PDFInfo
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- CN202535588U CN202535588U CN2012200698274U CN201220069827U CN202535588U CN 202535588 U CN202535588 U CN 202535588U CN 2012200698274 U CN2012200698274 U CN 2012200698274U CN 201220069827 U CN201220069827 U CN 201220069827U CN 202535588 U CN202535588 U CN 202535588U
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a LED high-efficient constant-current driving power supply. The LED high-efficient constant-current driving power supply comprises a control circuit, a signal feedback circuit, an output sampling and reference circuit, and a loop compensation circuit. The control circuit comprises a primary PFC power factor correction integrated circuit. The output sampling and reference circuit comprises an operational amplifier. The loop compensation circuit comprises a primary loop compensation circuit and a secondary loop compensation circuit. The primary loop compensation circuit consists of a resistor R7 connected across the feedback input pin and the operational amplifier output pin of the primary PFC power factor correction integrated circuit. The secondary loop compensation circuit consists of a capacitor C4 connected across the output pin and the constant-current voltage reference pin of the operational amplifier. The LED high-efficient constant-current driving power supply of the utility model has the following outstanding advantages: less components is used, the loop compensation circuit is greatly simplified, debugging difficulty of the power supply is reduced, the cost of the power supply device is reduced, and reliability of the power supply is improved.
Description
Technical field
The utility model relates to a kind of LED driving power, especially relates to the efficient constant-current driving power supply of a kind of LED.
Background technology
Semiconductor lighting (LED illumination) is that country encourages the lighting system with future development trend, with energy-conservation and high life be significant advantage, and the driving power that LED throws light on is the heart of LED lighting.The performance of LED driving power directly influences the performance of LED lighting.
The LED constant-current driving power supply that input and output are at present isolated mainly is the technical scheme with single-stage APFC,, through a PFC control chip, realizes the double action of power factor correction and output constant current simultaneously that is.As shown in Figure 1; Be LED constant-current driving power supply circuit theory diagrams common on the market, this driving power comprises safety protection circuit, EMI filter circuit, rectification circuit, control circuit, power delivery circuit, output rectifier and filter, output sampling and reference circuit, signal feedback circuit and loop compensation circuit.The electric main of the 220VAC of 50Hz is through behind the filter rectification; Become direct current with 100Hz ripple; Then through the power delivery circuit with electric energy from elementary be delivered to secondary; Output rectifier and filter is direct current with the electric energy that the transmission of power delivery circuit comes by the high-frequency alternating current rectifying and wave-filtering.Output sampling and reference circuit are realized the sampling of secondary current, are converted into d. c. voltage signal to dc current signal through resistance R 28, make comparisons this d. c. voltage signal and reference voltage through operational amplifier U2 the function of realization automatic constant current again.Signal feedback circuit is delivered to secondary control signal elementary through optocoupler U3.PFC integrated circuit U1 realizes the PFC (PFC, and power factor correction) of Switching Power Supply, the driving function of control and MOSFET Q1 automatically.In the use of electric energy; In order effectively to reduce the harmonic pollution of power supply to electrical network; Power supply need active power factor correction (that is, and PFC) circuit, power factor (being the PF value) just can be near 1 like this; Generally reaching more than 0.95 (does not have the electrical source power factor of pfc circuit generally to have only about 0.5), just can effectively reduce the harmonic pollution of Switching Power Supply to electrical network.The loop compensation details of circuit shown in Figure 1 is seen Fig. 2 and Fig. 3,, this scheme intermediate ring road compensates by R7, R8, C3, R30, C4, these six elements of C14 are realized.Wherein, R8, C3 realize a FZ1 compensation at zero point together, and R7 realizes a limit FP1 compensation.R30, C14 realize a FZ2 compensation at zero point, and R30, C4 realize a limit FP2 compensation.That is, these six elements have been realized two zero points (FZ1, FZ2) duopole (FP1, FP2) compensation together.The used components and parts of this compensation scheme are more, cause a lot of shortcomings: 1, loop compensation circuit is complicated; 2, increased debugging difficulty; 3, increased the element cost; 4, reduced the reliability of driving power.
Summary of the invention
The purpose of the utility model is: to the problem of prior art existence; Provide that a kind of to have a used element device few, simplify loop compensation circuit greatly, reduced the power supply debugging difficulty; Reduce the cost of supply unit, increased the efficient constant-current driving power supply of LED of the reliability of power supply.
The purpose of the utility model realizes through following technical scheme:
The efficient constant-current driving power supply of a kind of LED; Comprise control circuit, signal feedback circuit, output sampling and reference circuit and loop compensation circuit; Described control circuit comprises elementary PFC power factor correction integrated circuit; Described output sampling and reference circuit comprise operational amplifier; It is characterized in that described loop compensation circuit comprises elementary loop compensation circuit and secondary loop compensating circuit, elementary loop compensation circuit is made up of the resistance R 7 between feedback input pin that is connected across elementary PFC power factor correction integrated circuit and the amplifier output pin.
The resistance of described resistance R 7 is 500 Ω ~ 5K Ω.
Described secondary loop compensating circuit is made up of the capacitor C 4 between output pin that is connected across operational amplifier and the constant current voltage reference pin.
The capacitance of described capacitor C 4 is 0.5 μ F ~ 3 μ F.
The capacitance of described capacitor C 4 is preferably 1 μ F.
Compared with prior art, the utlity model has following advantage:
1, used element device is few; Simplify loop compensation circuit greatly, but the electrical source power factor of the utility model is at all not second to existing constant-current supply, power factor can reach the level greater than 0.95 equally; The power supply constant current accuracy can reach equally ± 3% level, and the Switching Power Supply stable performance;
2, the minimizing of element device; Greatly reduce the power supply debugging difficulty, traditional scheme need be debugged a plurality of element devices, and adopts the technical scheme of the utility model; Only need to confirm earlier the value (capacitance generally adopts 1 μ F) of capacitor C 4; Debug R7 (this resistance value is between 500 Ω ~ 5k Ω) then, can let the power factor specification of power supply and constant current index good, and steady operation;
3, the minimizing of components and parts directly makes the cost of whole supply unit reduce greatly;
4, another advantage of components and parts minimizing is exactly to reduce the probability that the inner components and parts of power supply break down, thereby increases the reliability of power supply;
5, the present technique scheme is applicable to all single-stage APFC LED constant-current driving schemes, and usage range is wide, such as the low-power LED driving power that both can be used to develop 5W, also can be used for the driving power of the LED of 50W, and is very with practical value.
Description of drawings
Fig. 1 is the structural representation of LED constant-current driving power supply common on the market;
Fig. 2 is the elementary compensating circuit structural representation of the LED constant-current driving power supply among Fig. 1;
Fig. 3 is the secondary compensation electrical block diagram of the LED constant-current driving power supply among Fig. 1;
Fig. 4 is the elementary compensating circuit structural representation of the utility model;
Fig. 5 is the secondary compensation electrical block diagram of the utility model;
Fig. 6 uses the structural representation on LED constant-current driving power supply shown in Figure 1 with the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
EmbodimentThe efficient constant-current driving power supply of a kind of LED
The LED constant-current driving power supply that input and output are at present isolated in order to reduce the harmonic pollution of driving power to electrical network, all can adopt power factor correction circuit.For driving power ability reliable work steady in a long-term, primary and secondary all must add loop compensation circuit, and the loop compensation circuit of traditional single-stage APFC constant-current driving power supply as shown in Figures 2 and 3; This scheme intermediate ring road compensates by R7, R8, C3; R30, C4, these six elements of C14 are realized.Wherein, R8, C3 realize a FZ1 compensation at zero point together, and R7 realizes a limit FP1 compensation.R30, C14 realize a FZ2 compensation at zero point, and R30, C4 realize a limit FP2 compensation.That is, these six elements have been realized two zero points (FZ1, FZ2) duopole (FP1, FP2) compensation together.The used components and parts of this compensation scheme are more, therefore can cause a lot of shortcomings.
In order to reduce the cost of driving power; Reduce the used components and parts of power supply; Improve the reliability of driving power, in back discovery through thinking and test of many times: when the electric main of the 220VAC of 50Hz through after the rectifier bridge rectification of constant-current driving power supply, become direct current with 100Hz ripple.In order to reduce the harmonic pollution of driving power to electrical network, (that is, PFC) circuit lets power factor (being the PF value) near 1 to need active power factor correction.Like this, the alternating current amplitude that the elementary MOSFET HF switch of power supply produces, must and rectification after have the dc voltage value of 100Hz ripple to be directly proportional; Promptly; When the magnitude of voltage after the rectification was big, primary current value just must be big, and power factor could be near 1 like this; Could effectively reduce the harmonic current value, effectively reduce the harmonic pollution of Switching Power Supply harmonic wave electrical network.The elementary PFC integrated circuit of Switching Power Supply is wanted efficiently sampling and the direct current of following the tracks of this 100Hz; The power supply loop bandwidth just must be very narrow; Therefore elementary PFC compensating element, can only realize that with a less R7 of resistance value ratio this resistance is generally between 500 Ω ~ 5k Ω between the INV of U1 pin and E-O pin.And it is secondary; In order to guarantee high constant current accuracy; Operational amplifier U2 must sample and follow the tracks of secondary dither electric current fast and effectively; The frequency of this dither power supply is consistent with the switching frequency of elementary MOSFET, and this frequency is determined by power output and the elementary sensibility reciprocal of transformer T1 together, generally at 50kHz ~ 200kHz.Because frequency is higher, so the compensating element, C4 of amplifier between OUTA pin and INA-pin as long as the appearance value is bigger, just can let U2 realize the demand of sampling fast and effectively and following the tracks of secondary dither electric current, and no longer need R30, C14 makes auxiliary usefulness.The general representative value of C4 capacitor's capacity is 1 μ F.After improving like this, electrical source power factor can reach the level greater than 0.95 equally, and the power supply constant current accuracy can reach equally ± 3% level, the Switching Power Supply stable performance.That is, after the improvement, each index of power supply is at all not second to the typical scenario before improving.This improvement project is verified through small lot batch manufacture.
Based on above theoretical the discovery; The utility model is the improvement of on existing loop compensation circuit, doing; The efficient constant-current driving power supply of a kind of LED comprises safety protection circuit, EMI filter circuit, rectification circuit, control circuit, power delivery circuit, output rectifier and filter, signal feedback circuit, output sampling and reference circuit and loop compensation circuit.Safety protection circuit is connected to civil power, when power supply breaks down, can avoid the power supply temperature too high and cause the accident of burning; EMI filter circuit and rectification circuit successively with the safety protection circuit circuit, realize the filter rectification of alternating current; The power delivery circuit is connected between rectification circuit and the output rectifier and filter, and electric energy is delivered to output rectifier and filter behind the primary and secondary of power delivery circuit; Control circuit is connected with the power delivery circuit, realizes the PFC (PFC, i.e. power factor correction) of Switching Power Supply, the driving function of control and MOSFET Q1 automatically, and control circuit comprises elementary PFC power factor correction integrated circuit; Output rectifier and filter is delivered to secondary ac voltage rectifier to transformer and is filtered into direct voltage; Output sampling and reference circuit are realized the sampling of secondary current, and are converted into d. c. voltage signal to dc current signal, make comparisons this d. c. voltage signal and constant current reference voltage through operational amplifier again, realize the function of constant current; Signal feedback circuit is connected between output sampling and reference circuit and the control circuit, is delivered to secondary control signal elementary.Loop compensation circuit comprises elementary loop compensation circuit and secondary loop compensating circuit, and elementary loop compensation circuit is made up of the resistance R 7 between feedback input pin that is connected across elementary PFC power factor correction integrated circuit and the amplifier output pin.The resistance of resistance R 7 can be selected between 500 Ω ~ 5K Ω according to actual needs.The secondary loop compensating circuit is made up of the capacitor C 4 between output pin that is connected across operational amplifier and the constant current voltage reference pin.The capacitance of capacitor C 4 can be selected between 0.5 μ F ~ 3 μ F according to actual needs, and the capacitance of capacitor C 4 is selected representative value 1 μ F usually.
As shown in Figure 6, for the utility model being applied in the structural representation on the existing LED constant-current driving power supply.This power supply comprises:
Safety protection circuit: form by F1 and RV1, when input voltage is too high, piezo-resistance RV1 conducting, high pressure discharges through RV1, protection power supply and load that power supply connects.When power supply breaks down, import big electric current, F1 is fusing in time, can avoid the power supply temperature too high and cause the accident of burning;
EMI filter circuit: R1, R2, CX1, LF1, CX2 forms.Realize the conducted interference inhibit feature of electromagnetic compatibility;
Rectification circuit: BR1 and C1 form.Realizing AC rectification filtering, is the 50Hz ac voltage rectifier direct voltage;
Control circuit: by integrated circuit U1, R6, R4, R5, R17, C2, R11, R12, R13, D2, R29, C6, C8, R23, R14, R22, R24, R18, C13 forms, and realizes the PFC (power factor correction) of Switching Power Supply, reaches control automatically and MOSFET and drives function;
The power delivery circuit: by D1, C11, C12 forms, and is delivered to secondary electric energy to transformer, and high-frequency alternating current, rectifying and wave-filtering is a direct current;
Output rectifier and filter: by D1, C11, C12 forms, and is delivered to secondary electric energy to transformer, and high-frequency alternating current, rectifying and wave-filtering is a direct current;
Signal feedback circuit: D5, U3, R10, R20, R21 forms, and is delivered to secondary control signal elementary through optocoupler U3;
Output sampling and reference circuit: by R31, C9, C7, U2, R32, C15; R28, D6, R19, C5, R15; R16, R9, U4, R26, R25; R27 forms, and realizes the sampling of secondary current, is converted into d. c. voltage signal to dc current signal through resistance R 28, makes comparisons this d. c. voltage signal and reference voltage through amplifier U2 the function of realization constant current again;
Loop compensation circuit: be made up of C4 and R7, the value of C4 is 1 μ F, and the value of R7 is 1K Ω, through the zero limit of control power supply loop, to guarantee the power supply loop enough phase margins and suitable bandwidth is arranged, to guarantee the Switching Power Supply steady operation.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Should be pointed out that any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (5)
1. efficient constant-current driving power supply of LED; Comprise control circuit, signal feedback circuit, output sampling and reference circuit and loop compensation circuit; Described control circuit comprises elementary PFC power factor correction integrated circuit; Described output sampling and reference circuit comprise operational amplifier; It is characterized in that described loop compensation circuit comprises elementary loop compensation circuit and secondary loop compensating circuit, elementary loop compensation circuit is made up of the resistance (R7) between feedback input pin that is connected across elementary PFC power factor correction integrated circuit and the amplifier output pin.
2. the efficient constant-current driving power supply of a kind of LED according to claim 1 is characterized in that, the resistance of described resistance (R7) is 500 Ω ~ 5K Ω.
3. the efficient constant-current driving power supply of a kind of LED according to claim 1 is characterized in that, described secondary loop compensating circuit is made up of the electric capacity (C4) between output pin that is connected across operational amplifier and the constant current voltage reference pin.
4. the efficient constant-current driving power supply of a kind of LED according to claim 1 is characterized in that, the capacitance of described electric capacity (C4) is 0.5 μ F ~ 3 μ F.
5. the efficient constant-current driving power supply of a kind of LED according to claim 4 is characterized in that the capacitance of described electric capacity (C4) is preferably 1 μ F.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200698274U CN202535588U (en) | 2012-02-29 | 2012-02-29 | LED high-efficient constant-current driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012200698274U CN202535588U (en) | 2012-02-29 | 2012-02-29 | LED high-efficient constant-current driving power supply |
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| CN202535588U true CN202535588U (en) | 2012-11-14 |
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| CN2012200698274U Expired - Fee Related CN202535588U (en) | 2012-02-29 | 2012-02-29 | LED high-efficient constant-current driving power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298186A (en) * | 2012-02-29 | 2013-09-11 | 成都能元科技有限公司 | LED efficient constant current driving source |
| CN103354690A (en) * | 2013-08-07 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
-
2012
- 2012-02-29 CN CN2012200698274U patent/CN202535588U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103298186A (en) * | 2012-02-29 | 2013-09-11 | 成都能元科技有限公司 | LED efficient constant current driving source |
| CN103298186B (en) * | 2012-02-29 | 2015-06-03 | 成都能元科技有限公司 | LED efficient constant current driving source |
| CN103354690A (en) * | 2013-08-07 | 2013-10-16 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
| CN103354690B (en) * | 2013-08-07 | 2015-06-17 | 杭州士兰微电子股份有限公司 | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof |
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| Date | Code | Title | Description |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20160229 |