CN103068129A - Light-emitting diode (LED) driving power supply - Google Patents
Light-emitting diode (LED) driving power supply Download PDFInfo
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- CN103068129A CN103068129A CN2013100138799A CN201310013879A CN103068129A CN 103068129 A CN103068129 A CN 103068129A CN 2013100138799 A CN2013100138799 A CN 2013100138799A CN 201310013879 A CN201310013879 A CN 201310013879A CN 103068129 A CN103068129 A CN 103068129A
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Abstract
The invention relates to the light-emitting diode (LED) manufacturing field and provides a LED driving power supply. The LED driving power supply comprises a power input end, an electro magnetic compatibility (EMC) circuit, a rectifying circuit, a voltage conditioning circuit, a filtering circuit, an output current voltage detecting circuit and an LED lamp at the output end of the output current voltage detecting circuit, and further comprises a constant current and constant voltage controlling circuit, wherein the power input end, the EMC circuit, the rectifying circuit, the voltage conditioning circuit, the filtering circuit, the output current voltage detecting circuit and the LED lamp are connected in sequence, the constant current and constant voltage controlling circuit is connected with an output end of the output current voltage detecting circuit and an input end of the voltage conditioning circuit, an inductance and a piezoresistor are arranged between the rectifying circuit and the voltage conditioning circuit, the inductance is connected with the rectifying circuit and the voltage conditioning circuit in series, the piezoresistor is connected with the rectifying circuit and the voltage conditioning circuit in parallel, and the input end of the piezoresistor is connected with the output end of the inductance. The LED driving power supply has the advantages that elements with big sizes, high failure rates and high prices are greatly reduced, the structure is simple and reasonable, the cost is lowered and application is stable and reliable. The inductance is added between the rectifying circuit and the voltage conditioning circuit, so that undesirable effects due to the fact that different-mode signals transit to a power grid are restrained, meanwhile the piezoresistor is added, and thereby the ability of the power supply to reject outside surge is improved.
Description
Technical field
The present invention relates to LED and make the field, more specifically, relate to a kind of simple and reasonablely, cost uses reliable and stable LED driving power.
Background technology
LED, light-emitting diode is a kind of semiconductor subassembly that can convert electrical energy into luminous energy, has that volume is little, power consumption is low, a long service life, the advantage such as environmental and durable, is widely used in the fields such as lighting, display screen, traffic signal lamp.
Because LED is the semiconductor device of characteristic sensitivity, has again negative temperature characteristic, thereby needs it is carried out steady-working state and protection in application process, thereby need the LED driving power.LED near harshness, unlike common incandescent lamp bulb, can directly connect the electric main of 220V to the requirement of driving power.LED is the low voltage drive of 2～3V, must design complicated translation circuit.At present, when Choice and design LED driving power, need to consider from high reliability, high efficiency, High Power Factor, surge protection, useful life, the aspect such as adaptive.
In the prior art, as shown in Figure 1, traditional high-power LED driving power source inputs to the LED light fixture of EMC circuit, rectification circuit, pfc circuit, voltage conversion circuit, filter circuit, output current voltage detecting circuit and output successively by the AC power supplies supplying power for input end.Also be provided with simultaneously constant-current and constant-voltage control circuit, comprise amplifying driving and drive circuit, exported successively to the input of amplification driving, drive circuit, voltage conversion circuit by the output of output current voltage detecting circuit, drive for LED provides constant current constant voltage.Wherein pfc circuit also forms the loop with DC power supply, power control circuit.
This traditional high-power LED driving power source is comparatively complicated, the some of them element has the shortcoming that volume is large, power is large, cost is high, failure rate is high, such as powerful metal-oxide-semiconductor, high frequency transformer, recovery diode, electrochemical capacitor etc., so that whole circuit energy consumption is larger, inefficiency, holistic cost is high simultaneously, lacks the reliability that uses.
Summary of the invention
Technical problem to be solved by this invention provides a kind of simple and reasonable, increases work efficiency, and cost uses reliable and stable LED driving power.
The technical solution adopted for the present invention to solve the technical problems is: a kind of LED driving power, comprise the power input that connects successively, the EMC circuit, rectification circuit, voltage conversion circuit, filter circuit, the LED light fixture of output current voltage detecting circuit and output, also comprise simultaneously constant-current and constant-voltage control circuit, being connected input with voltage conversion circuit with the output of output current voltage detecting circuit respectively is connected, connect between described rectification circuit and described voltage conversion circuit an inductance and piezo-resistance in parallel, the input of piezo-resistance is connected with the output of inductance.
LED driving power of the present invention is powered by power input, input to successively the LED light fixture of EMC circuit, rectification circuit, voltage conversion circuit, filter circuit, output current voltage detecting circuit and output, wherein the EMC circuit suppresses external electromagnetic interference signal; Rectification circuit is converted to direct current energy to the AC energy of power supply input; Voltage conversion circuit then is converted to high voltage direct current required low-voltage dc signal; The filter circuit alternating component in the low-voltage dc signal that then reduces as much as possible to pulse keeps flip-flop, reduces the ripple coefficient of output voltage, makes waveform become smoother; The output current voltage detecting circuit detects the current and voltage signals of exporting and feeds back to voltage conversion circuit by constant-current and constant-voltage control circuit, drives for LED provides constant current constant voltage.
Compare with traditional high-power LED driving power source, the present invention has cancelled pfc circuit, thereby do not need to use powerful metal-oxide-semiconductor and high frequency transformer in the pfc circuit, cancelled simultaneously high-power, high back-pressure, fast recovery diode D2 and large volume, large capacity, high withstand voltage electrochemical capacitor C20 between the pfc circuit and voltage conversion circuit among Fig. 1.Said elements is the element that power is large, volume is large, failure rate is high, price is high, and the present invention has significantly reduced these elements, thereby simple and reasonable, can the Effective Raise operating efficiency, and cost, working stability is reliable.In addition, between rectification circuit and voltage conversion circuit, increased inductance, suppressed because difference mode signal is transmitted to the harmful effect that causes on the electrical network.Owing to having cancelled high withstand voltage electrochemical capacitor C20, between rectification circuit and voltage conversion circuit, increased piezo-resistance simultaneously, as the compensation of the inhibition ability that improves power supply surge to external world.
In one embodiment, described constant-current and constant-voltage control circuit comprises that amplification drives, power factor control circuit, amplifying the input that drives is connected with the output of output current voltage detecting circuit, amplify the output that drives and be connected with the input of power factor control circuit, the output of power factor control circuit is connected with the input of voltage conversion circuit.Amplify the current and voltage signals that drives output and after amplifying Treatment Analysis, generate corresponding control signal, be delivered to power factor control circuit, power factor control circuit is processed by analysis and is indicated, and index signal is fed back to voltage conversion circuit, realizes the control of constant current and constant voltage.Compare with traditional high-power LED drive circuit, cancelled drive circuit, further simplified overall structure.
In one embodiment; be connected with overvoltage crowbar between described rectification circuit and the power factor control circuit; the input of overvoltage crowbar is connected with the output of rectification circuit, and the output of overvoltage crowbar is connected with the input of power factor control circuit.When the voltage of rectification circuit was higher than certain numerical value, overvoltage crowbar was delivered to power factor control circuit with signal, and voltage conversion circuit is cut off in control; When voltage returned to normal range (NR), overvoltage crowbar was delivered to power factor control circuit with signal again, control turn-on voltage translation circuit.
In one embodiment, the input of described amplification driving is connected with thermal-shutdown circuit.When the excess Temperature of LED light fixture; thermal-shutdown circuit is delivered to signal to amplify and drives; then by the output current of power factor control circuit control mandatory down low-voltage translation circuit, avoid the LED light fixture to cause damage because of excess Temperature, further improve the reliability that uses.
In one embodiment, the input of described amplification driving is connected with the output short-circuit open loop protection circuit.When detecting short circuit, automatic shutdown circuit is realized the effective protection of self, and is sent warning, prevents from endangering further expansion, resets through after the several seconds, if be still short circuit, again cuts off circuit, constantly patrols ring, until fault is got rid of.
In a preferred implementation, the model of described power factor control circuit is L6561, can very accurately adjust overvoltage output, have minimum starting current and low-down operating current, it is the upgraded version of the power factor corrector of L6560 specification, has how superior performance, tolerable is operated in very wide effective input voltage range (from 85V to 265V), starting current is compressed to is low to moderate tens of microampere and is provided with disabler, lower with the current loss of guaranteeing standby mode.
The present invention takes full advantage of the premium properties of power factor L6561: it has the current over-zero measuring ability, not only effectively avoided transformer because the adverse consequences of saturated generation, reduce simultaneously the switching loss of metal-oxide-semiconductor, greatly improve the conversion efficiency of whole power circuit; It passes through the pulsed dc voltage after the detection rectification, automatically adjusts output frequency and duty ratio, improves conversion efficiency and the power factor of circuit; It has the overcurrent protection function of metal-oxide-semiconductor, and when the electric current of metal-oxide-semiconductor reached certain value, moment was turn-offed metal-oxide-semiconductor, effectively protects metal-oxide-semiconductor, makes reliablely, increases the service life.
The invention has the beneficial effects as follows: the present invention has significantly reduced the element that volume is large, failure rate is high, price is high, and is simple and reasonable, can the Effective Raise operating efficiency, and cost.Power factor can up to more than the PF=0.95, meet the category-A standard of national street lighting.Between rectification circuit and voltage conversion circuit, increased inductance, resisted because difference mode signal is transmitted to the harmful effect that causes on the electrical network.Between rectification circuit and voltage conversion circuit, also increase simultaneously piezo-resistance, improved the inhibition ability of power supply surge to external world.In addition, increase overvoltage crowbar and thermal-shutdown circuit, further improved the reliability that uses.
Description of drawings
Fig. 1 is the structural representation of high-power LED driving power source traditional in the prior art.
Fig. 2 is the structural representation of the embodiment of the invention 1.
Fig. 3 is the structural representation of the embodiment of the invention 2.
Fig. 4 is the structural representation of the embodiment of the invention 3.
Fig. 5 is the structural representation of the embodiment of the invention 4.
Omitted among the figure with the present invention and designed the irrelevant miscellaneous part of main points.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further details.
Embodiment 1
As shown in Figure 2, a kind of LED driving power of the present invention comprises the successively LED light fixture 107 of power input 101, EMC circuit 102, rectification circuit 103, voltage conversion circuit 104, filter circuit 105, output current voltage detecting circuit 106 and the output of connection.Also comprise constant-current and constant-voltage control circuit, comprise and amplify driving 108, power factor control circuit 109, the input that amplifies driving 108 is connected with the output of output current voltage detecting circuit 106, the output that amplifies driving 108 is connected with the input of power factor control circuit 109, and the output of power factor control circuit 109 is connected with the input of voltage conversion circuit 104.Connect between rectification circuit 103 and voltage conversion circuit 104 simultaneously an inductance L 3 and piezo-resistance YM3 of parallel connection, the input of piezo-resistance YM3 is connected with the output of inductance L 3.
LED driving power of the present invention is by power input 101 power supplies, in the present embodiment, use the AC220V power supply, input to successively the LED light fixture 107 of EMC circuit 102, rectification circuit 103, voltage conversion circuit 104, filter circuit 105, output current voltage detecting circuit 106 and output, wherein 102 pairs of external electromagnetic interference signals of EMC circuit suppress; Rectification circuit 103 is converted to direct current energy to the AC energy of power supply input; 104 of voltage conversion circuits are converted to required low-voltage dc signal with high voltage direct current, mainly comprise metal-oxide-semiconductor Q1 and winding T1, and capacitor C 6 in parallel between rectification circuit 103 and voltage conversion circuit 104 forms a lc circuit with inductance L 3; 105 alternating components that reduce as much as possible in the pulsating dc voltage of filter circuit keep flip-flop, reduce the ripple coefficient of output voltage, make waveform become smoother, mainly comprise diode D1 and capacitor C 30; The current and voltage signals of 106 pairs of outputs of output current voltage detecting circuit detects and is delivered to amplify and drives 108, amplify and drive the 108 current and voltage signals corresponding control signals of generation after amplifying Treatment Analysis with output, be delivered to power factor control circuit 109, power factor control circuit is processed by analysis and is indicated, index signal is fed back to voltage conversion circuit, realize the control of constant current and constant voltage.Amplify Light Coupled Device U3 of series connection and capacitor C 22 in parallel between driving 108 and the power factor control circuit 109, magnitude of voltage appearance fluctuation when 106 outputs of output current voltage detecting circuit, 109 control signal duty ratios that automatically change output of power factor control circuit, thereby change the ON time of metal-oxide-semiconductor Q1 in the voltage conversion circuit 104, and then change output current and voltage, realize effective adjusting of constant current and constant voltage.
In the present embodiment, the model of power factor control circuit 109 is L6561, by 110 power supplies of DC12V power supply, can very accurately adjust overvoltage output.The present invention takes full advantage of the premium properties of power factor L6561: it has the current over-zero measuring ability, not only effectively avoided transformer because the adverse consequences of saturated generation, reduce simultaneously the switching loss of metal-oxide-semiconductor, greatly improve the conversion efficiency of whole power circuit; It passes through the pulsed dc voltage after the detection rectification, automatically adjusts output frequency and duty ratio, improves conversion efficiency and the power factor of circuit; It has the overcurrent protection function of metal-oxide-semiconductor, and when the electric current of metal-oxide-semiconductor reached certain value, moment was turn-offed metal-oxide-semiconductor, effectively protects metal-oxide-semiconductor, makes reliablely, increases the service life.
In the present embodiment, the input of described amplification driving 108 is connected with the output short-circuit open loop protection circuit.When detecting short circuit, automatic shutdown circuit, and send warning, and prevent from endangering further expansion, reset through after the several seconds, if be still short circuit, again cut off circuit, constantly patrol ring, until fault is got rid of.
As shown in Figure 1 and Figure 2, compare with traditional high-power LED driving power source, the present invention has cancelled pfc circuit, thereby do not need to use powerful metal-oxide-semiconductor and high frequency transformer in the pfc circuit, cancelled simultaneously high-power, high back-pressure, fast recovery diode D2 and the large volume between pfc circuit and the voltage conversion circuit, large capacity, high withstand voltage electrochemical capacitor C20.Said elements is the element that power is large, volume is large, failure rate is high, price is high, and the present invention has significantly reduced these elements, thereby simple and reasonable, can the Effective Raise operating efficiency, and cost, working stability is reliable.Simultaneously, also cancel drive circuit, further simplified overall structure.In addition, between rectification circuit and voltage conversion circuit, increased inductance L 3, suppressed because difference mode signal is transmitted to the harmful effect that causes on the electrical network.Owing to having cancelled high withstand voltage electrochemical capacitor C20, between rectification circuit and voltage conversion circuit, increased piezo-resistance YM3 simultaneously, as the compensation of the inhibition ability that improves power supply surge to external world.
Embodiment 2
As shown in Figure 3; the difference of the present embodiment and embodiment 1 is: in the present embodiment; be connected with overvoltage crowbar 111 between described rectification circuit 103 and the power factor control circuit 109; the input of overvoltage crowbar 111 is connected with the output of rectification circuit 103, and the output of overvoltage crowbar 111 is connected with the input of power factor control circuit 109.When the voltage of rectification circuit 103 was higher than certain numerical value, overvoltage crowbar 111 was delivered to power factor control circuit 109 with signal, and voltage conversion circuit 104 is cut off in control; When voltage returned to normal range (NR), overvoltage crowbar 111 was delivered to signal again power factor control circuit 109, control turn-on voltage translation circuit 104.
Other structures are identical with embodiment 1.
Embodiment 3
As shown in Figure 4, the difference of the present embodiment and embodiment 1 is: in the present embodiment, the input of described amplification driving 108 is connected with thermal-shutdown circuit 112.When the excess Temperature of LED light fixture 107; thermal-shutdown circuit 112 is delivered to signal to amplify and drives 108; amplify the voltages increase that driving 108 feeds back to power factor control circuit 109; then by power factor control circuit 109 so that output the control signal duty ratio reduce; and then the ON time of metal-oxide-semiconductor Q1 shortens in the control voltage conversion circuit 104; thereby force to reduce output current, avoid the LED light fixture to cause damage because of excess Temperature, further improve the reliability that uses.
Other structures are identical with embodiment 1.
Embodiment 4
As shown in Figure 5; the difference of the present embodiment and embodiment 1 is: in the present embodiment; be connected with overvoltage crowbar 111 between described rectification circuit 103 and the power factor control circuit 109; the input of overvoltage crowbar 111 is connected with the output of rectification circuit 103, and the output of overvoltage crowbar 111 is connected with the input of power factor control circuit 109.When the voltage of rectification circuit 103 was higher than certain numerical value, overvoltage crowbar 111 was delivered to power factor control circuit 109 with signal, and voltage conversion circuit 104 is cut off in control; When voltage returned to normal range (NR), overvoltage crowbar 111 was delivered to signal again power factor control circuit 109, control turn-on voltage translation circuit 104.
Simultaneously, in the present embodiment, the input of described amplification driving 108 also is connected with thermal-shutdown circuit 112.When the excess Temperature of LED light fixture 107; thermal-shutdown circuit 112 is delivered to signal to amplify and drives 108; amplify the voltages increase that driving 108 feeds back to power factor control circuit 109; then by power factor control circuit 109 so that output the control signal duty ratio reduce; and then the ON time of metal-oxide-semiconductor Q1 shortens in the control voltage conversion circuit 104; thereby force to reduce output current, avoid the LED light fixture to cause damage because of excess Temperature, further improve the reliability that uses.
Other structures are identical with embodiment 1.
Only be the preferred embodiments of the present invention below, but design concept of the present invention is not limited to this, all insubstantial modifications of utilizing this design that the present invention is made also all fall within protection scope of the present invention.
Claims (6)
1. led drive circuit, it is characterized in that, the LED light fixture that comprises the power input, EMC circuit, rectification circuit, voltage conversion circuit, filter circuit, output current voltage detecting circuit and the output that connect successively, also comprise simultaneously constant-current and constant-voltage control circuit, being connected input with voltage conversion circuit with the output of output current voltage detecting circuit respectively is connected, connect between described rectification circuit and described voltage conversion circuit an inductance and piezo-resistance in parallel, the input of piezo-resistance is connected with the output of inductance.
2. led drive circuit according to claim 1, it is characterized in that, described constant-current and constant-voltage control circuit comprises that amplification drives, power factor control circuit, amplifying the input that drives is connected with the output of output current voltage detecting circuit, amplify the output that drives and be connected with the input of power factor control circuit, the output of power factor control circuit is connected with the input of voltage conversion circuit.
3. led drive circuit according to claim 2; it is characterized in that; be connected with overvoltage crowbar between described rectification circuit and the power factor control circuit; the input of overvoltage crowbar is connected with the output of rectification circuit, and the output of overvoltage crowbar is connected with the input of power factor control circuit.
4. led drive circuit according to claim 2 is characterized in that, the input that described amplification drives is connected with thermal-shutdown circuit.
5. led drive circuit according to claim 2 is characterized in that, the input that described amplification drives is connected with the output short-circuit open loop protection circuit.
6. according to claim 2 to 5 each described led drive circuits, it is characterized in that, the model of described power factor control circuit is L6561.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100138799A CN103068129A (en) | 2013-01-15 | 2013-01-15 | Light-emitting diode (LED) driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100138799A CN103068129A (en) | 2013-01-15 | 2013-01-15 | Light-emitting diode (LED) driving power supply |
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| CN103068129A true CN103068129A (en) | 2013-04-24 |
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| CN2013100138799A Pending CN103068129A (en) | 2013-01-15 | 2013-01-15 | Light-emitting diode (LED) driving power supply |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346681A (en) * | 2013-06-13 | 2013-10-09 | 重庆雷士实业有限公司 | LED lighting device and anti-explosion power supply thereof |
| CN106664033A (en) * | 2015-06-22 | 2017-05-10 | 株式会社日立制作所 | Power conversion device, and diagnosis system and diagnosis method for power conversion device |
| CN107018604A (en) * | 2016-01-27 | 2017-08-04 | 广美科技股份有限公司 | Anti-electromagnetic interference device |
| CN110147126A (en) * | 2019-05-15 | 2019-08-20 | 苏州佳世达电通有限公司 | Temperature-control circuit and its control method |
| CN110515013A (en) * | 2019-07-25 | 2019-11-29 | 广东浪潮大数据研究有限公司 | A kind of dielectric strength test method, system and server power supply |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103346681A (en) * | 2013-06-13 | 2013-10-09 | 重庆雷士实业有限公司 | LED lighting device and anti-explosion power supply thereof |
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| CN106664033A (en) * | 2015-06-22 | 2017-05-10 | 株式会社日立制作所 | Power conversion device, and diagnosis system and diagnosis method for power conversion device |
| CN107018604A (en) * | 2016-01-27 | 2017-08-04 | 广美科技股份有限公司 | Anti-electromagnetic interference device |
| CN107018604B (en) * | 2016-01-27 | 2019-04-26 | 广美科技股份有限公司 | Anti-electromagnetic interference device |
| CN110147126A (en) * | 2019-05-15 | 2019-08-20 | 苏州佳世达电通有限公司 | Temperature-control circuit and its control method |
| CN110515013A (en) * | 2019-07-25 | 2019-11-29 | 广东浪潮大数据研究有限公司 | A kind of dielectric strength test method, system and server power supply |
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Application publication date: 20130424 |