CN202713712U - Low-power and high-efficiency LED driver - Google Patents
Low-power and high-efficiency LED driver Download PDFInfo
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- CN202713712U CN202713712U CN 201220288119 CN201220288119U CN202713712U CN 202713712 U CN202713712 U CN 202713712U CN 201220288119 CN201220288119 CN 201220288119 CN 201220288119 U CN201220288119 U CN 201220288119U CN 202713712 U CN202713712 U CN 202713712U
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- chip microcomputer
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- led driver
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Abstract
The utility model discloses a low-power and high-efficiency LED driver, wherein the circuit of the LED driver comprises a transformer. One ends of the secondary coils of the transformer are connected in series with a diode and a switch. A light emitting diode and a resistor, which are orderly connected in series with each other, are connected in parallel between the m terminal of the switch and the ground terminals of the secondary coils. A capacitor is also connected in parallel between the secondary coils of the transformer. An MOS tube, a singlechip and a voltage standard are also connected between the secondary coils of the transformer. An amplifying circuit and a photoelectric coupler are connected between the secondary coils and the singlechip. The output terminal of the photoelectric coupler is connected with an LED electrical appliance. According to the technical scheme of the utility model, the circuit of the LED driver is controlled by a current-limiting resistor and a singlechip, so that the instantaneous current of the circuit during the switching on/off moment of an LED can be detected. Then the voltage of a power supply is controlled by a feedback circuit. Thus, the supply current during the switching on/off moment of the LED is more reasonable. The circuit has the advantages of simple structure, accurate and sensitive control, good energy-saving effect, lower cost and wide application prospect.
Description
Technical field
The utility model is a kind of led drive circuit, relates to the electronic circuit technology field, is specifically related to a kind of low-power consumption, high efficiency led driver.
Background technology
The LED technology has realized key breakthrough at present, and the ratio of performance to price also is greatly improved simultaneously.The present LED life-span can reach more than 100000 hours, and the operating voltage low energy consumption is very little; In addition, LED is powered by low-voltage dc power supply, and its light source control cost is low, can capable of adjusting brightness, and frequent switch, and can not produce harmful effect to the performance of LED.Therefore, LED is fit to be applied on the Solar lamp as light source very much.
The light source dc drive circuit of traditional form mostly is the constant voltage actuated type, and the driving voltage of namely keeping in the course of the work on the luminous original paper is constant within the specific limits, and electric current then has than great fluctuation process, and the simplest is exactly the battery activation circuit of flashlight.But LED is not because himself characteristic of semiconductor requires during work that voltage is steady state value, but requires its electric current to keep constant and can not surpass load current value.In case drive current has surpassed specified working current value, the life-span of LED will obviously reduce.
Therefore, need to a kind ofly can satisfy LED to the drive circuit of the demand of constant current, in order to LED is applied on the Solar lamp.
Existing led drive circuit generally has two schemes: the one, use transformer pressure-reducing, and the 220V electric main is become the 12V alternating current by transformer, become direct current by rectifying and wave-filtering again and light LED.The shortcoming of this scheme is that volume is large, power consumption large, heating is large, uses inconvenient at household appliances.The 2nd, use switching power circuit, although volume is little, cost is high, and complex circuit, externally disturbs also large.
The utility model content
The purpose of this utility model is to overcome the defective that exists in the prior art, provides a kind of simple in structure, the led driver circuit of low-power consumption and protecting against shock.
For achieving the above object, the technical solution of the utility model is a kind of low-power consumption of design, the high efficiency led driver, it is characterized in that, described driver comprises transformer T, end at described transformer secondary output coil L2 is serially connected with diode D1 and switch S 1, between the earth terminal of the m of described switch end and secondary coil, be parallel with light-emitting diode D2 and the resistance R 1 that is connected in series successively, between described secondary coil, also be parallel with capacitor C1, between described secondary coil, also be connected with metal-oxide-semiconductor, single-chip microcomputer IC1 and voltage reference device IC2, also be connected with amplifying circuit and photoelectrical coupler between described secondary coil and single-chip microcomputer, the output of described photoelectrical coupler is connected with the LED electrical appliance.
Wherein preferred technical scheme is, described capacitor C1 is electrolytic capacitor, and the positive pole of described electrolytic capacitor is connected between the A end of diode D1 and switch S 1.
Further preferred technical scheme is, described single-chip microcomputer has 8 pins that are arranged in order counterclockwise, the pin one of described single-chip microcomputer is connected with the signal output part of voltage reference device, the signal input part of described voltage reference device is connected between the n end of the positive pole of electrochemical capacitor and switch, the earth terminal of described voltage reference device is connected and ground connection with the pin of single-chip microcomputer 8, the pin 7 of described single-chip microcomputer is connected with the m of switch end, the pin 6 of described single-chip microcomputer is connected between light-emitting diode D2 and the resistance R 1, and the pin 4 of described single-chip microcomputer is connected with amplifying circuit; The drain electrode of described metal-oxide-semiconductor is connected on the pin 6 of single-chip microcomputer, and the grid of described metal-oxide-semiconductor is connected on the pin 5 of single-chip microcomputer, and the source electrode of described metal-oxide-semiconductor is connected to the earth terminal of secondary coil.
Further preferred technical scheme also has, described amplifying circuit comprises triode, the base stage of described triode is connected with the pin of single-chip microcomputer 4, the collector electrode of described triode is connected with an input of optical coupler, another input of described optical coupler connects between the positive pole of diode D1 and electrolytic capacitor, the emitter of described triode is connected with the positive pole of voltage stabilizing didoe, the negative pole of described voltage stabilizing didoe is connected with the collector electrode of triode, is provided with ground connection between the positive pole of the emitter of described triode and voltage stabilizing didoe.
Preferred technical scheme also has, and described transformer L1 is connected on the power circuit.
Preferred technical scheme also has, and the resistance of described resistance is chosen the electric current that flows through less than the rated current of LED.
Advantage of the present utility model and beneficial effect are: this low-power consumption, high efficiency led driver, owing to adopted current-limiting resistance and single chip machine controlling circuit, can be by detecting LED at the switch supply current of moment, then by feedback circuit control power supply terminal voltage, thereby make LED be tending towards reasonable at the supply current of switch moment.This circuit structure is simple, and precise control is sensitive, and power savings is good, and cost is lower, has broad application prospects.
Description of drawings
Fig. 1 is the utility model low-power consumption, high efficiency led driver schematic diagram;
Fig. 2 is the circuit diagram of existing led driver.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples only are used for the technical solution of the utility model more clearly is described, and can not limit protection range of the present utility model with this.
As shown in Figure 1, the utility model is a kind of low-power consumption, the high efficiency led driver, this driver comprises transformer T, end at transformer secondary output coil L2 is serially connected with diode D1 and switch S 1, between the earth terminal of the B of switch S 1 end and secondary coil L2, be parallel with light-emitting diode D2 and the resistance R 1 that is connected in series successively, between secondary coil L2, also be parallel with capacitor C1, between secondary coil L2, also be connected with metal-oxide-semiconductor Q1, single-chip microcomputer IC1 and voltage reference device IC2, also be connected with amplifying circuit and photoelectrical coupler IC3 between secondary coil L2 and single-chip microcomputer IC1, the output of photoelectrical coupler IC3 is connected with the LED electrical appliance.
Preferred embodiment is in the utility model, and the optional electrolytic capacitor of use of capacitor C1 is between the A that the positive pole of electrolytic capacitor C1 is connected to diode D1 and switch S 1 holds.
Further preferred embodiment is in the utility model, single-chip microcomputer IC1 has 8 pins that are arranged in order counterclockwise, the pin one of single-chip microcomputer IC1 is connected with the signal output part of voltage reference device IC2, the signal input part of voltage reference device IC2 is connected between the A end of the positive pole of electrochemical capacitor C1 and switch S 1, the earth terminal of voltage reference device IC2 is connected and ground connection with the pin 8 of single-chip microcomputer IC1, the pin 7 of single-chip microcomputer IC1 is connected with the B of switch S 1 end, the pin 6 of single-chip microcomputer IC1 is connected between light-emitting diode D2 and the resistance R 1, and the pin 4 of single-chip microcomputer IC1 is connected with amplifying circuit; The drain electrode of metal-oxide-semiconductor Q1 is connected on the pin 6 of single-chip microcomputer IC1, and the grid of metal-oxide-semiconductor Q1 is connected on the pin 5 of single-chip microcomputer IC1, and the source electrode of metal-oxide-semiconductor Q1 is connected to the earth terminal of secondary coil L2.
Further preferred embodiment in the utility model, amplifying circuit comprises triode Q2, the base stage of triode Q2 is connected with the pin 4 of single-chip microcomputer IC1, the collector electrode of triode Q2 is connected with the input of optical coupler IC3, another input of optical coupler IC3 connects between the positive pole of diode D1 and electrolytic capacitor C1, the emitter of triode Q2 is connected with the positive pole of voltage stabilizing didoe IC4, the negative pole of voltage stabilizing didoe IC4 is connected with the collector electrode of triode Q2, is provided with ground connection between the positive pole of the emitter of triode Q2 and voltage stabilizing didoe IC4.
Preferred embodiment also has in the utility model, and described transformer T primary coil L1 is connected on the power circuit.
Preferred embodiment in the utility model, the resistance of described resistance R 1 are chosen the electric current that flows through less than the rated current of LED.
The operation principle of the utility model low-power consumption, high efficiency led driver is:
As shown in Figure 1, when S1 disconnected, the C1 electric weight reached maximum under initial condition, and the B point turn-offs Q1 simultaneously.
When switch S 1 closure, electric current flows through from R1, and the R1 resistance is chosen electric current less than the rated current of LED.IC1 (MUC) detects the existence of A point voltage simultaneously, makes C point output voltage this moment, and control IC3 reduces the elementary energy transmission of T1.The C1 energy when IC1 detection A point voltage counting LED electric current is lower than rated current, is made the output of B point open Q1 by slow release, closes simultaneously the C point control, and the energy of primary allows to pass to secondary.Because Q1 is metal-oxide-semiconductor, the extremely low power consumption that effectively reduces of internal resistance.
When S1 closes, after IC1 detects the D point voltage and is, reset to initial condition.
The utility model low-power consumption, high efficiency led driver and prior art as shown in Figure 2, power consumption contrast is as follows:
Take output current as example as 1000mA
1, the circuit common power consumption is: P=V*I=0.7*1A=0.7W
V is BE pole tension=0.7V of Q2
2, the utility model erosion control circuit power consumption is: P=I^2*R=1*1*0.05=0.05w
V is Q1 internal resistance=0.05 Europe, 14 times low in energy consumption than circuit common.
The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (6)
1. low-power consumption, the high efficiency led driver, it is characterized in that, described driver comprises transformer T, end at described transformer secondary output coil L2 is serially connected with diode D1 and switch S 1, between the earth terminal of the m of described switch end and secondary coil, be parallel with light-emitting diode D2 and the resistance R 1 that is connected in series successively, between described secondary coil, also be parallel with capacitor C1, between described secondary coil, also be connected with metal-oxide-semiconductor, single-chip microcomputer IC1 and voltage reference device IC2, also be connected with amplifying circuit and photoelectrical coupler between described secondary coil and single-chip microcomputer, the output of described photoelectrical coupler is connected with the LED electrical appliance.
2. low-power consumption as claimed in claim 1, high efficiency led driver is characterized in that, described capacitor C1 is electrolytic capacitor, and the positive pole of described electrolytic capacitor is connected between the A end of diode D1 and switch S 1.
3. low-power consumption as claimed in claim 2, the high efficiency led driver, it is characterized in that, described single-chip microcomputer has 8 pins that are arranged in order counterclockwise, the pin one of described single-chip microcomputer is connected with the signal output part of voltage reference device, the signal input part of described voltage reference device is connected between the n end of the positive pole of electrochemical capacitor and switch, the earth terminal of described voltage reference device is connected and ground connection with the pin of single-chip microcomputer 8, the pin 7 of described single-chip microcomputer is connected with the m of switch end, the pin 6 of described single-chip microcomputer is connected between light-emitting diode D2 and the resistance R 1, and the pin 4 of described single-chip microcomputer is connected with amplifying circuit; The drain electrode of described metal-oxide-semiconductor is connected on the pin 6 of single-chip microcomputer, and the grid of described metal-oxide-semiconductor is connected on the pin 5 of single-chip microcomputer, and the source electrode of described metal-oxide-semiconductor is connected to the earth terminal of secondary coil.
4. low-power consumption as claimed in claim 3, the high efficiency led driver, it is characterized in that, described amplifying circuit comprises triode, the base stage of described triode is connected with the pin of single-chip microcomputer 4, the collector electrode of described triode is connected with an input of optical coupler, another input of described optical coupler connects between the positive pole of diode D1 and electrolytic capacitor, the emitter of described triode is connected with the positive pole of voltage stabilizing didoe, the negative pole of described voltage stabilizing didoe is connected with the collector electrode of triode, is provided with ground connection between the positive pole of the emitter of described triode and voltage stabilizing didoe.
5. low-power consumption as claimed in claim 1, high efficiency led driver is characterized in that described transformer L1 is connected on the power circuit.
6. low-power consumption as claimed in claim 1, high efficiency led driver is characterized in that, the resistance of described resistance is chosen the electric current that flows through less than the rated current of LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220288119 CN202713712U (en) | 2012-06-19 | 2012-06-19 | Low-power and high-efficiency LED driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220288119 CN202713712U (en) | 2012-06-19 | 2012-06-19 | Low-power and high-efficiency LED driver |
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| Publication Number | Publication Date |
|---|---|
| CN202713712U true CN202713712U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220288119 Expired - Fee Related CN202713712U (en) | 2012-06-19 | 2012-06-19 | Low-power and high-efficiency LED driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108650753A (en) * | 2018-07-26 | 2018-10-12 | 上海联合滚动轴承有限公司 | A kind of circuit of light sources of three-meter measuring machine |
-
2012
- 2012-06-19 CN CN 201220288119 patent/CN202713712U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108650753A (en) * | 2018-07-26 | 2018-10-12 | 上海联合滚动轴承有限公司 | A kind of circuit of light sources of three-meter measuring machine |
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| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130130 Termination date: 20170619 |