CN103096566A - Light-emitting diode (LED) lamp and drive circuit thereof - Google Patents
Light-emitting diode (LED) lamp and drive circuit thereof Download PDFInfo
- Publication number
- CN103096566A CN103096566A CN2011103477822A CN201110347782A CN103096566A CN 103096566 A CN103096566 A CN 103096566A CN 2011103477822 A CN2011103477822 A CN 2011103477822A CN 201110347782 A CN201110347782 A CN 201110347782A CN 103096566 A CN103096566 A CN 103096566A
- Authority
- CN
- China
- Prior art keywords
- led
- drive circuit
- unit
- led lamp
- circuit
- Prior art date
- 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.)
- Pending
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention belongs to the field of control of light-emitting diodes (LEDs), and particularly relates to an LED lamp and a drive circuit of the LED lamp. According to the drive circuit of the LED lamp, a regular LED voltage stabilization direct current supply power source is changed to a power source removal form, a current fluctuation mode is adopted to drive an LED, a filtering unit is not provided, and electromagnetic transition of a circuit is reduced. The purpose of the drive circuit of the LED lamp is to improve a power factor of the circuit, reduce circuit loss, and save cost. According to the LED lamp and the drive circuit of the LED lamp, LEDs with different numbers are connected in series, or lamps with a certain number are connected in a series-parallel connection mode, the LED lamp and the drive circuit of the LED lamp can be flexibly applicable to different lamps, are applicable to voltage and power requirements in different countries, and are simple in circuit and novel in idea.
Description
Technical field
The invention belongs to LED lamp circuit field, particularly relate to a kind of LED light fixture and drive circuit thereof.
Background technology
LED is as new type light source, it have power consumption less, the characteristics such as applicability is strong, stability is strong, the response time is short, environment-friendly high-efficiency, technology has been tending towards ripe and has been applied to every field, LED is widely used as lighting source.
On the market, for the power supply of LED all can a kind of constant current constant voltage of specialized designs, metastable supply power mode, this just requires the mains ac power supply to need to carry out filtering through components and parts such as inductance, electric capacity after rectification to process, and becomes more stably output voltage and supplies with LED.So also just increased design cost, the increase of the inner filtering device of AC-DC power supply has strengthened the electromagnetic conversion in the current supply circuit, has produced some unnecessary losses, has reduced the power factor of whole circuit, and this and current energy-conservation requirement are contrary.
Summary of the invention
The object of the present invention is to provide a kind of LED drive circuit, power supply is removed in realization, adopt the current fluctuation mode to power to LED, be intended to solve the electromagnetic conversion consumed energy that existing power supply circuits exist, cause the lower technical problem of circuit power factor, realize simplifying circuit, reduce circuit loss, save the requirement of cost.
The present invention is achieved in that
A kind of LED drive circuit is connected with the LED unit with mains ac power supply 100 respectively and is connected, and comprises that one is connected with LED unit 300, with civil power alternating current 100 be converted to the direct current of fluctuation, directly to the rectification unit 200 of LED unit 300 power supplies.
As a modification of the present invention, after described LED drive circuit is serially connected in LED unit 300 with a constant current chip 400, to reduce the current fluctuation amplitude of LED unit 300.
Another object of the present invention is to provide a kind of LED light fixture, described LED light fixture comprises a drive circuit that is connected with LED unit 300, described drive circuit comprise one with civil power alternating current 100 be converted to the direct current of fluctuation, directly to the rectification unit 200 of LED unit 300 power supplies.
As a kind of application of the present invention, the difference of voltage applicable according to circuit, the lamp string of described LED unit 300 for being consisted of by a plurality of LED serial connections.
As a kind of application of the present invention, according to the difference of circuit power or environment for use, described LED unit 300 is made of the connection in series-parallel of a plurality of LED lamp.
The present invention is at the LED drive circuit power supply that gets on, adopt the current fluctuation mode to power, this type of drive can promote the summary of LED and use and popularize, and especially will play significant role at aspects such as improving circuit power factor, minimizing electric energy loss, save design cost.
Description of drawings
Fig. 1 be LED drive circuit provided by the invention system block diagram;
Fig. 2 is the circuit structure diagram of the LED light fixture that provides of first embodiment of the invention;
Fig. 3 is the circuit structure diagram of the LED light fixture that provides of second embodiment of the invention;
Fig. 4 is the circuit structure diagram of the LED light fixture that provides of third embodiment of the invention;
Fig. 5 is the circuit structure diagram of the LED light fixture that provides of fourth embodiment of the invention;
Fig. 6 is the oscillogram of the input voltage of LED light fixture provided by the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows LED drive circuit system block diagram provided by the invention, for ease of explanation, only shows the part relevant with the present embodiment, and details are as follows:
A kind of LED drive circuit adopts the current fluctuation type of drive to LED unit 300 power supplies, with civil power High Level AC Voltage AC power supplies 100 after rectification unit 200 is processed, direct driving LED unit 300.Adopt this drive circuit, removed the filter unit in conventional LED drive circuit from, reduce the electromagnetic conversion of circuit, improve its power factor, the LED illumination is driven more simplify, cost is lower.
As an improvement of the present invention, be connected in series a constant current chip 400 after LED unit 300, to reduce the current fluctuation amplitude of LED unit 300, reach the lighting requirement of LED.
Fig. 2 shows the circuit structure of the LED light fixture that first embodiment of the invention provides, and for ease of explanation, only shows the part relevant with the present embodiment, and details are as follows:
A kind of LED light fixture, comprise a drive circuit that is connected with the LED unit, this drive circuit after the rectifier bridge rectification, produces the dc voltage of a fluctuation with civil power High Level AC Voltage AC power supplies, direct driving LED unit, the LED unit is a lamp string that is made of a plurality of LED serial connections.Rectifier bridge is made of four diodes, the input termination mains ac power supply of rectifier bridge, output termination LED lamp string.As the improvement of the present embodiment, LED lamp string is connected in series a constant current chip again, and constant current chip can make the current fluctuation of LED lamp string greatly reduce, to reach the stabilizing effect in certain limit.
Fig. 3 shows the circuit structure of the LED light fixture that second embodiment of the invention provides, and different from the first embodiment shown in Figure 2 is, LED drive circuit also comprises a capacitor C 1, and capacitor C 1 is connected between the output and ground of rectifier bridge.
Fig. 4 shows the circuit structure of the LED light fixture that third embodiment of the invention provides, uniquely from the first embodiment shown in Figure 2 different be, what rectification unit was corresponding is a rectification chip, civil power High Level AC Voltage AC power supplies is after the rectification chip rectification, produce the dc voltage of a fluctuation, directly the driving LED unit.
Fig. 5 shows the circuit structure of the LED light fixture that fourth embodiment of the invention provides, and for ease of explanation, only shows the part relevant with the present embodiment, and details are as follows:
A kind of LED light fixture, comprise a drive circuit that is connected with the LED unit, this drive circuit adopts the current fluctuation type of drive, with civil power High Level AC Voltage AC power supplies after the rectifier bridge rectification, produce the dc voltage of a fluctuation, directly drive the circuit that is made of the connection in series-parallel of a plurality of LED lamp, the parallel circuits of LED lamp string is connected in series a constant current chip again, constant current chip can make the current fluctuation of LED lamp string greatly reduce, to reach the stabilizing effect in certain limit.
Same, the rectifier bridge in the LED lamp driving circuit also can be at electric capacity of output termination, and whole rectifier bridge also can replace with rectification chip, for exempting from repetition, is not described further.
The light fixture that the LED light fixture that fourth embodiment of the invention provides and first, second, and third embodiment provide, difference just is that the supply power voltage of whole LED light fixture power supply circuits is different with output power, can satisfy the different demands under various environments for use.
The operation principle of the LED drive circuit that provides below in conjunction with 6 pairs of embodiment of the present invention of accompanying drawing illustrates.
AC power supplies produces the dc voltage of a fluctuation after rectification, as shown in the figure, select a fiducial value uo as the minimum powered operation voltage to LED lamp string at this waveform.During more than or equal to uo, LED lamp string is lighted when the voltage by LED lamp string, and the voltage that passes through is during less than uo, and LED lamp string does not work.Because certain periodicity is followed in the fluctuation of this voltage, and frequency is about 100-120HZ, due to the visual persistence effect of human eye, can not differentiate extinguishing and glimmering of lamp string, and that gives the people feels to be exactly that LED is always at a light yellow.Uo is changeable for this fiducial value, decides depending on the withstand voltage of constant current chip and the quantity of LED lamp string.Constant current chip can make the current fluctuation of LED lamp string greatly reduce, to reach the stabilizing effect in certain limit.If output power is enough, can also and connect a few string LED lamp strings.
LED drive circuit provided by the invention changes the LED voltage stabilizing dc power supply of routine into power supply, adopts current fluctuation mode driving LED, without filter unit, has reduced the electromagnetic conversion of circuit.The purpose of using this type of drive is to improve circuit power factor, reduces circuit loss, and circuit is simple and easy, and thought is novel.The LED lamp point serial connection of different numbers or the lamp connection in series-parallel of some are adopted in invention, and design can be applicable to different lamps neatly like this, adapts to voltage and the power requirement of country variant.
The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. LED drive circuit is used for the driving LED unit, and it is characterized in that: described LED drive circuit comprises: be connected with the LED unit with the mains ac power supply respectively, alternating current be converted to the galvanic rectification unit of fluctuation.
2. LED drive circuit as claimed in claim 1 is characterized in that: described LED drive circuit comprises that also one is connected with described LED unit, reduces the current fluctuation amplitude of described LED unit, the constant current chip of plateau current.
3. LED drive circuit as claimed in claim 1 or 2, it is characterized in that: described rectification unit is a rectifier bridge that is made of four diodes, the described mains ac power supply of input termination of described rectifier bridge, the described LED of the output termination unit of described rectifier bridge.
4. LED drive circuit as claimed in claim 3, is characterized in that, described rectification unit also comprises an electric capacity that is connected between rectification bridge output end and ground.
5. LED drive circuit as claimed in claim 1 or 2, it is characterized in that: described rectification unit is a rectification chip, the described mains ac power supply of input termination of described rectification chip, the described LED of the output termination unit of described rectification chip.
6. a LED light fixture, comprise the LED unit, it is characterized in that, described LED light fixture also comprises as the described LED drive circuit of claim 1-5 any one.
7. LED light fixture as claimed in claim 6, is characterized in that: the lamp string of described LED unit for being made of a plurality of LED serial connections.
8. LED light fixture as claimed in claim 6 is characterized in that: described LED unit is made of the connection in series-parallel of a plurality of LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103477822A CN103096566A (en) | 2011-11-07 | 2011-11-07 | Light-emitting diode (LED) lamp and drive circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103477822A CN103096566A (en) | 2011-11-07 | 2011-11-07 | Light-emitting diode (LED) lamp and drive circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103096566A true CN103096566A (en) | 2013-05-08 |
Family
ID=48208523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103477822A Pending CN103096566A (en) | 2011-11-07 | 2011-11-07 | Light-emitting diode (LED) lamp and drive circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103096566A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2857404Y (en) * | 2005-12-20 | 2007-01-10 | 刘世安 | A.C. 220V LED constant current driving circuit |
| US20100109558A1 (en) * | 2008-11-03 | 2010-05-06 | Tong Fatt Chew | AC to DC LED illumination devices, systems and methods |
| CN201739881U (en) * | 2010-06-08 | 2011-02-09 | 深圳市明学光电有限公司 | Constant current led flexible lamp belt |
| CN201919222U (en) * | 2011-02-25 | 2011-08-03 | 深圳粤宝电子工业总公司 | Led driver |
| CN102223748A (en) * | 2011-06-17 | 2011-10-19 | 苏州半导体总厂有限公司 | Drive method and drive power source of light-emitting diode (LED) lamp with alternating current power supply |
-
2011
- 2011-11-07 CN CN2011103477822A patent/CN103096566A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2857404Y (en) * | 2005-12-20 | 2007-01-10 | 刘世安 | A.C. 220V LED constant current driving circuit |
| US20100109558A1 (en) * | 2008-11-03 | 2010-05-06 | Tong Fatt Chew | AC to DC LED illumination devices, systems and methods |
| CN201739881U (en) * | 2010-06-08 | 2011-02-09 | 深圳市明学光电有限公司 | Constant current led flexible lamp belt |
| CN201919222U (en) * | 2011-02-25 | 2011-08-03 | 深圳粤宝电子工业总公司 | Led driver |
| CN102223748A (en) * | 2011-06-17 | 2011-10-19 | 苏州半导体总厂有限公司 | Drive method and drive power source of light-emitting diode (LED) lamp with alternating current power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2017124748A1 (en) | Switch power supply having active power factor correction | |
| CN101527983B (en) | White-light LED illumination driving circuit on basis of current-type charge pump | |
| CN102570861A (en) | High-power-factor LED (Light Emitting Diode) constant-current driving power supply without electrolytic capacitor | |
| CN104768291A (en) | Improved Cuk LED drive power source without electrolytic capacitor | |
| CN202738205U (en) | LED dimming drive circuit | |
| CN201893981U (en) | Light-emitting diode (LED) spotlight drive circuit | |
| CN203896538U (en) | LED driving power source employing single switch tube and two Buck-Boost circuits in cascade connection | |
| CN203574891U (en) | Capacitance-resistance voltage-reduction non-isolated type LED driving power supply | |
| CN103379696B (en) | Light emitting diode lighting device and light emitting diode lamps | |
| CN204652745U (en) | A kind of constant current driver circuit for LED | |
| RU103991U1 (en) | POWER SUPPLY FOR LED MATRIX | |
| CN103096566A (en) | Light-emitting diode (LED) lamp and drive circuit thereof | |
| CN202679708U (en) | LED (light emitting diode) driving circuit | |
| CN201878364U (en) | Improved output non-electrolytic capacitance circuit | |
| CN202841636U (en) | Equal duty cycle light-emitting diode (LED) pulsation driving power circuit | |
| CN207475930U (en) | LED drive power circuit and luminaire | |
| CN201315691Y (en) | Power control circuit of high-power LED lamp | |
| CN201742601U (en) | Stabilized power supply of light-emitting diode lamp | |
| CN204291482U (en) | A kind of great power LED is without stroboscopic driving power | |
| CN103687209A (en) | Alternating-current drive circuit of LED streetlight | |
| CN103917020B (en) | A kind of LED drive circuit | |
| CN102905429B (en) | Pulse-driven power circuit of LEDs (light emitting diodes) with equal duty ratio | |
| CN202019481U (en) | Driving circuit of low-current high-voltage light emitting diode (LED) lamp | |
| CN212727500U (en) | LED load detection circuit and step-down LED driving power supply | |
| CN203554730U (en) | Improved LED switching type constant-current power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130508 |