CN107682954A - A kind of LED drive power - Google Patents
A kind of LED drive power Download PDFInfo
- Publication number
- CN107682954A CN107682954A CN201710913424.0A CN201710913424A CN107682954A CN 107682954 A CN107682954 A CN 107682954A CN 201710913424 A CN201710913424 A CN 201710913424A CN 107682954 A CN107682954 A CN 107682954A
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- China
- Prior art keywords
- diode
- voltage
- led drive
- drive power
- pwm
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
The present invention provides a kind of LED drive power, including exchange input, current rectifying and wave filtering circuit, high frequency dc to dc converter, output filter circuit, PWM drive circuit.LED drive power of the present invention, simple in construction, the alternating voltage of input is carried out rectifying and wave-filtering by LED drive power, using pwm pulse signal control after rectifying and wave-filtering into DC voltage, save the larger power transformer of volume；Efficiency high, small power consumption, LED drive power switching tube are operated in Sofe Switch state, and conversion efficiency reaches as high as more than 95%；Working range is wide, and LED drive power changes the size of output voltage by changing the pulsewidth of input direct voltage, possesses wider range of regulation.
Description
Technical field
The present invention relates to LED control technology fields, and in particular to a kind of LED drive power.
Background technology
With increasingly improving for urban infrastructure construction and being obviously improved for social material civilization's degree, the city in China
The development of Landscape Lighting technology is also quite rapid, and from initial realizing, illumination functions are transitioned into performance of today to its action mode
Functional lighting, its control method is also from single to diversification, multi-level transformation.Traditional Lighting Control Assembly is mainly using manual
Control, although simple and direct-viewing operation, control mode is single, needs excessively to rely on effector, its limitation is very big, and phase be present
To scattered, not problems such as manageability and autgmentability difference, the wasting of resources was not only caused but also had greatly reduced flexibility.LED energy-conservations,
The characteristics of environmental protection, long lifespan, has catered to the demand for development in epoch so that LED illumination technology is widely used in every field.But
The influence of life-span, efficiency and the luminescent quality of LED product largely power quality driven.
The content of the invention
(1) technical problem solved
The present invention provides a kind of simple in construction, efficiency high, small power consumption, working range wide LED drive power.
(2) technical scheme
To realize object above, the present invention is achieved by the following technical programs：
A kind of LED drive power, including exchange input, current rectifying and wave filtering circuit, high frequency dc to dc converter, output filtered electrical
Road, PWM drive circuit, the exchange input is 220V alternating currents, and 220V alternating currents are after current rectifying and wave filtering circuit rectifying and wave-filtering
Become direct current Vdc, direct current Vdc is transformed into DC voltage Vo by high frequency dc to dc converter, and DC voltage Vo is by output
Steady dc voltage is exported after filter circuit filtering, the DC voltage of output filter circuit output is connected with PWM drive circuit,
PWM drive circuit produces PWM drive signal driving high frequency dc to dc converter.
Further, the high frequency dc to dc converter is double-end normal shock converter.
Further, the double-end normal shock converter includes switching tube Q1, Q2, transformer T1, diode D1, D2, D3,
D4, electric capacity C1, C2, C3, inductance L1, direct current Vdc positive pole are connected with switching tube Q1 drain electrode, switching tube Q1 source electrode and change
One end of depressor T1 primary sides is connected, and the transformer T1 primary sides other end is connected with switching tube Q2 drain electrode, switching tube Q2 source electrode with
Direct current Vdc negative pole is connected, and Vdc negative pole ground connection GND, diode D3 negative electrode is connected with switching tube Q1 drain electrode, two poles
Pipe D3 anode is connected with switching tube Q2 drain electrode, and diode D4 negative electrode is connected with switching tube Q1 source electrode, diode D4's
Plus earth GND, electric capacity C2 are connected in parallel on diode D3 both ends, and electric capacity C3 is connected in parallel on diode D4 both ends；Transformer T1 secondary
One end is connected with diode D1 anode, and diode D1 negative electrode is connected with diode D2 negative electrode, diode D2 anode with
The transformer T1 secondary other end is connected, and the one end of diode D2 anode also with inductance L1 is connected, inductance L1 another termination
Ground GND, electric capacity C1 one end are connected with diode D1 negative electrode, and other end ground connection GND, electric capacity C1 both ends are output DC voltage
Vo；Grid of the pwm signal caused by PWM drive circuit respectively with switching tube Q1, Q2 is connected.
Further, described switching tube Q1, Q2 are metal-oxide-semiconductor IFR630.
Further, described diode D3, D4 are fast recovery diode.
Further, the fast recovery diode is Schottky diode.
Further, it is in series with current sense resistor R1 between the source electrode of the switching tube Q2 and diode D4 anode.
Further, the current sense resistor R1 is 0.1 ohm.
Further, the PWM drive circuit includes comparator, reference voltage, oscillating circuit, PWM makers, through output
One input of the filtered output voltage of filter circuit and comparator is connected, another input of comparator and reference voltage phase
Even, the output end of comparator and PWM makers, oscillating circuit produce clock signal and clock signal are passed into PWM makers,
PWM makers produce PWM drive signal.
Further, the output filter circuit is LCL filter circuits, and LCL filter circuits include inductance L3, L4, electric capacity
C4, the positive pole that output DC voltage Vo is converted through high frequency dc to dc converter are connected with inductance L3 one end, the inductance L3 other ends and electricity
Holding C4 one end to be connected, the electric capacity C4 other ends are connected with inductance L4 one end, and the inductance L4 other ends are connected with DC voltage Vo negative pole,
Electric capacity C4 both end voltages are output steady dc voltage.
(3) beneficial effect
Beneficial effects of the present invention：A kind of LED drive power, simple in construction, LED drive power is by the alternating voltage of input
Carry out rectifying and wave-filtering, using pwm pulse signal control rectifying and wave-filtering after into DC voltage, save the larger power supply transformation of volume
Device；Efficiency high, small power consumption, LED drive power switching tube are operated in Sofe Switch state, and conversion efficiency reaches as high as more than 95%；
Working range is wide, and LED drive power changes the size of output voltage by changing the pulsewidth of input direct voltage, possesses wider
Range of regulation.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is principle of the invention block diagram；
Fig. 2 is high frequency dc to dc converter circuit theory diagrams；
Fig. 3 is output filter circuit schematic diagram.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
With reference to Fig. 1, a kind of LED drive power, including exchange input, current rectifying and wave filtering circuit, high frequency dc to dc converter, output
Filter circuit, PWM drive circuit.Exchange input is 220V alternating currents, and 220V alternating currents pass through current rectifying and wave filtering circuit rectifying and wave-filtering
After become direct current Vdc, direct current Vdc is transformed into DC voltage Vo by high frequency dc to dc converter, and DC voltage Vo is by defeated
Steady dc voltage, the DC voltage and PWM drive circuit phase of output filter circuit output are exported after going out filter circuit filtering
Even, PWM drive circuit produces PWM drive signal driving high frequency dc to dc converter.
With reference to Fig. 2, high frequency dc to dc converter can be double-end normal shock converter, and double-end normal shock converter includes switching tube
Q1, Q2, transformer T1, diode D1, D2, D3, D4, electric capacity C1, C2, C3, inductance L1.Direct current Vdc positive pole and switching tube
Q1 drain electrode is connected, and switching tube Q1 source electrode is connected with one end of transformer T1 primary sides, the transformer T1 primary sides other end and switch
Pipe Q2 drain electrode is connected, and switching tube Q2 source electrode is connected with direct current Vdc negative pole, Vdc negative pole ground connection GND.Diode D3
Negative electrode be connected with switching tube Q1 drain electrode, diode D3 anode is connected with switching tube Q2 drain electrode, diode D4 negative electrode
It is connected with switching tube Q1 source electrode, diode D4 plus earth GND.Electric capacity C2 is connected in parallel on diode D3 both ends, and electric capacity C3 is simultaneously
It is associated in diode D4 both ends.Transformer T1 secondary one end is connected with diode D1 anode, diode D1 negative electrode and two poles
Pipe D2 negative electrode is connected, and diode D2 anode is connected with the transformer T1 secondary other end, diode D2 anode also with electricity
Sense L1 one end is connected, inductance L1 other end ground connection GND.Electric capacity C1 one end is connected with diode D1 negative electrode, another termination
Ground GND, electric capacity C1 both ends are output DC voltage Vo.Pwm signal caused by PWM drive circuit respectively with switching tube Q1, Q2
Grid is connected.
Switching tube Q1, Q2 are metal-oxide-semiconductor IFR630.IR the 5th generation HEXFET power field effect pipe IRF630 is using advanced
Technology manufactures, and has extremely low conduction impedance.This characteristics of IRF630, plus quick switching rate, and with firm resistance to
Designed with famous HEXFET so that IRF630 turns into the extremely super wide device of high efficient and reliable, application.TO-220 encapsulation
IRF630 is generally applicable to industry and commerce application of the power consumption in 50W or so, the TO-220 encapsulation of low thermal resistance and low cost, makes IRF630
Obtain generally accreditation in the industry.The IRF630 of D2Pak encapsulation installs suitable for paster, is sealed compared with any other existing paster
Dress, can say it is power highest, conduction impedance is minimum.TO-262 is IRF630 through hole installation version, is adapted to the application of lower end.
Diode D3, D4 use fast recovery diode, and fast recovery diode can be Schottky diode, the pole of Schottky two
Pipe is a kind of low-power consumption, ultra-speed semiconductor device, is widely used in the circuits such as Switching Power Supply, frequency converter, driver, is made high
Frequently, low pressure, high current commutation diode, fly-wheel diode, protection diode use, or make rectification in the circuits such as microwave communication
Diode, small-signal detector diode use.In order to realize current detecting, switching tube Q2 source electrode and diode D4 sun
Current sense resistor R1 is in series between pole, current sense resistor R1 resistances are 0.1 ohm.
PWM drive circuit includes comparator, reference voltage, oscillating circuit, PWM makers, is filtered through output filter circuit
One input of output voltage afterwards and comparator is connected, and another input of comparator is connected with reference voltage, comparator it is defeated
Go out end and PWM makers, oscillating circuit produces clock signal and clock signal is passed into PWM makers, and PWM makers produce
PWM drive signal.Pwm control circuit can select UC3845 modules, and UC3845 has been internally integrated tunable oscillator, high-gain is missed
Poor amplifier and current sampling comparator, is aimed at designed by lower pressure, can accurate adjustment according to voltage and current feedback signal
Pwm pulse signal dutycycle is exported, so that output voltage stabilization is in setting value.
With reference to Fig. 3, output filter circuit is LCL filter circuits, and LCL filter circuits include inductance L3, L4, electric capacity C4, warp
High frequency dc to dc converter conversion output DC voltage Vo positive pole is connected with inductance L3 one end, the inductance L3 other ends and electric capacity C4 mono-
End is connected, and the electric capacity C4 other ends are connected with inductance L4 one end, and the inductance L4 other ends are connected with DC voltage Vo negative pole, electric capacity C4
Both end voltage is output steady dc voltage.
In summary, LED drive power of the embodiment of the present invention, simple in construction, LED drive power is by the alternating voltage of input
Carry out rectifying and wave-filtering, using pwm pulse signal control rectifying and wave-filtering after into DC voltage, save the larger power supply transformation of volume
Device；Efficiency high, small power consumption, LED drive power switching tube are operated in Sofe Switch state, and conversion efficiency reaches as high as more than 95%；
Working range is wide, and LED drive power changes the size of output voltage by changing the pulsewidth of input direct voltage, possesses wider
Range of regulation.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic；And these modification or
Replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
- A kind of 1. LED drive power, it is characterised in that：Including exchange input, current rectifying and wave filtering circuit, high frequency dc to dc converter, defeated Go out filter circuit, PWM drive circuit, the exchange input is 220V alternating currents, and 220V alternating currents are whole by current rectifying and wave filtering circuit Become direct current Vdc after stream filtering, direct current Vdc is transformed into DC voltage Vo, DC voltage Vo by high frequency dc to dc converter Steady dc voltage is exported after output filter circuit filters, DC voltage and the PWM of output filter circuit output drive Circuit is connected, and PWM drive circuit produces PWM drive signal driving high frequency dc to dc converter.
- A kind of 2. LED drive power as claimed in claim 1, it is characterised in that the high frequency dc to dc converter be both-end just Exciting converter.
- 3. a kind of LED drive power as claimed in claim 2, it is characterised in that the double-end normal shock converter includes switch Pipe Q1, Q2, transformer T1, diode D1, D2, D3, D4, electric capacity C1, C2, C3, inductance L1, direct current Vdc positive pole and switch Pipe Q1 drain electrode is connected, and switching tube Q1 source electrode is connected with one end of transformer T1 primary sides, and the transformer T1 primary side other ends are with opening The drain electrode for closing pipe Q2 is connected, and switching tube Q2 source electrode is connected with direct current Vdc negative pole, Vdc negative pole ground connection GND, diode D3 negative electrode is connected with switching tube Q1 drain electrode, and diode D3 anode is connected with switching tube Q2 drain electrode, diode D4 the moon Pole is connected with switching tube Q1 source electrode, and diode D4 plus earth GND, electric capacity C2 are connected in parallel on diode D3 both ends, electric capacity C3 It is connected in parallel on diode D4 both ends；Transformer T1 secondary one end is connected with diode D1 anode, diode D1 negative electrode and two Pole pipe D2 negative electrode is connected, and diode D2 anode is connected with the transformer T1 secondary other end, diode D2 anode also with Inductance L1 one end is connected, and inductance L1 other end ground connection GND, electric capacity C1 one end is connected with diode D1 negative electrode, the other end GND is grounded, electric capacity C1 both ends are output DC voltage Vo；Pwm signal caused by PWM drive circuit respectively with switching tube Q1, Q2 Grid be connected.
- 4. a kind of LED drive power as claimed in claim 3, it is characterised in that described switching tube Q1, Q2 are metal-oxide-semiconductor IFR630。
- 5. a kind of LED drive power as claimed in claim 3, it is characterised in that described diode D3, D4 recover two poles to be fast Pipe.
- 6. a kind of LED drive power as claimed in claim 5, it is characterised in that the fast recovery diode is Schottky two Pole pipe.
- A kind of 7. LED drive power as claimed in claim 3, it is characterised in that the source electrode and diode of the switching tube Q2 Current sense resistor R1 is in series between D4 anode.
- 8. a kind of LED drive power as claimed in claim 7, it is characterised in that the current sense resistor R1 is 0.1 Europe Nurse.
- A kind of 9. LED drive power as claimed in claim 1, it is characterised in that the PWM drive circuit include comparator, Reference voltage, oscillating circuit, PWM makers, through the filtered output voltage of output filter circuit and one input of comparator It is connected, another input of comparator is connected with reference voltage, output end and the PWM makers of comparator, when oscillating circuit produces Clock signal is simultaneously passed to PWM makers by clock signal, and PWM makers produce PWM drive signal.
- 10. a kind of LED drive power as claimed in claim 1, it is characterised in that the output filter circuit filters for LCL Circuit, LCL filter circuits include inductance L3, L4, electric capacity C4, the positive pole for exporting DC voltage Vo are converted through high frequency dc to dc converter It is connected with inductance L3 one end, the inductance L3 other ends are connected with electric capacity C4 one end, and the electric capacity C4 other ends are connected with inductance L4 one end, electricity The sense L4 other ends are connected with DC voltage Vo negative pole, and electric capacity C4 both end voltages are output steady dc voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710913424.0A CN107682954A (en) | 2017-09-30 | 2017-09-30 | A kind of LED drive power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710913424.0A CN107682954A (en) | 2017-09-30 | 2017-09-30 | A kind of LED drive power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107682954A true CN107682954A (en) | 2018-02-09 |
Family
ID=61139412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710913424.0A Withdrawn CN107682954A (en) | 2017-09-30 | 2017-09-30 | A kind of LED drive power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107682954A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389306A (en) * | 2018-04-16 | 2019-10-29 | 纬创资通股份有限公司 | Arrangement for detecting and method for detecting |
| CN112469167A (en) * | 2020-12-09 | 2021-03-09 | 成都极米科技股份有限公司 | Voltage adjusting circuit and dimming circuit |
-
2017
- 2017-09-30 CN CN201710913424.0A patent/CN107682954A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389306A (en) * | 2018-04-16 | 2019-10-29 | 纬创资通股份有限公司 | Arrangement for detecting and method for detecting |
| CN110389306B (en) * | 2018-04-16 | 2022-05-24 | 纬创资通股份有限公司 | Detection device and detection method |
| CN112469167A (en) * | 2020-12-09 | 2021-03-09 | 成都极米科技股份有限公司 | Voltage adjusting circuit and dimming circuit |
| CN112469167B (en) * | 2020-12-09 | 2022-07-01 | 成都极米科技股份有限公司 | Voltage adjusting circuit and dimming circuit |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20201225 Address after: 247000 302, residential building 10, Keyuan new village, Huxin Road, Guichi District, Chizhou City, Anhui Province Applicant after: Chizhou Intellectual Property Service Center Co.,Ltd. Address before: 247000 Industrial Park, Muzhen Town, Qingyang County, Chizhou City, Anhui Province Applicant before: CHIZHOU JINGHUA CLEAN TECHNOLOGY Co.,Ltd. |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180209 |
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| WW01 | Invention patent application withdrawn after publication |