CN202603016U - Driving circuit of LED (light-emitting diode) fluorescent lamp with adjustable light - Google Patents

Driving circuit of LED (light-emitting diode) fluorescent lamp with adjustable light Download PDF

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Publication number
CN202603016U
CN202603016U CN2012202805726U CN201220280572U CN202603016U CN 202603016 U CN202603016 U CN 202603016U CN 2012202805726 U CN2012202805726 U CN 2012202805726U CN 201220280572 U CN201220280572 U CN 201220280572U CN 202603016 U CN202603016 U CN 202603016U
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China
Prior art keywords
circuit
switch
fluorescent lamp
control unit
constant
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Expired - Fee Related
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CN2012202805726U
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Chinese (zh)
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吴雯雯
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吴雯雯
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Priority to CN2012202805726U priority Critical patent/CN202603016U/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The utility model discloses a driving circuit of an LED (light-emitting diode) fluorescent lamp with adjustable light. The driving circuit comprises a filtration and rectification circuit, a constant voltage circuit, a voltage-reducing constant current circuit, a switch detection circuit, a power supply circuit and a control unit, wherein the filtration and rectification circuit is connected with a power supply through a switch; the constant voltage circuit is connected with the filtration and rectification circuit; the constant voltage circuit is connected with the voltage-reducing constant current circuit and the power supply circuit; the switch detection circuit is connected with the power circuit and the control unit; the control unit is connected with the voltage-reducing constant current circuit; the voltage-reducing constant current circuit outputs constant current to light the LED fluorescent lamp; and the control unit detects whether the switch is connected or not through the switch detection circuit, records the switch times in set time, and outputs PWM (Pulse-Width Modulation) waves with different duty cycles to the voltage-reducing constant current circuit according to different switch times, so as to control adjustable light of the LED fluorescent lamp. The adjustable light of the LED fluorescent lamp is realized by summing the switch times without modifying a switch panel, and the energy-conserving advantage of the LED fluorescent lamp is further embodied.

Description

A kind of Dimmable LED fluorescent lamp drive circuit
Technical field
The utility model belongs to power technique fields, relates to a kind of Dimmable LED fluorescent lamp drive circuit especially.
Background technology
In recent years, the LED develop rapidly of throwing light on had replaced the traditional lighting light source gradually with its energy-conservation advantage.Fluorescent lamp is the important light source in the traditional lighting, and all there are use so widely in school, office and family, are just progressively replaced by the LED fluorescent lamp at present; In order original circuit and device not to be done too much change; The appearance design and the traditional fluorescent lamp of LED fluorescent lamp are about the same, and interface is just the same especially, and guaranteeing only needs to change fluorescent tube in the daylight lamp energy-saving improvement project; Can reduce improvement expenses, more help marketing.What in the fluorescent lamp improvement project, adopt basically at present all is can not dimming LED fluorescent lamp; If because be replaced by the Dimmable LED fluorescent lamp; Dimmer need to be installed, must to be transformed original switch panel, this big limitations the popularization of Dimmable LED fluorescent lamp.In fact; Tunable optical is another big advantage of LED, and LED is as the typical application of semiconductor lighting, and its core is a PN junction; It has the electrology characteristic of general-purpose diode; The luminous flux of LED is directly proportional with drive current, and its outstanding dimming effect is that traditional lighting institute is incomparable, and its dimming function is demonstrating fully of LED power savings advantages especially.Be combined in such as, plurality of applications field that also not need light to be in most of the time bright entirely, maybe half bright just enough, 50% the energy can be practiced thrift so at least, but in the application of present LED fluorescent lamp, this huge advantage can't be brought into play.
So, to the above-mentioned defective that exists in the present prior art, be necessary to study in fact, so that a kind of scheme to be provided, solve the defective that exists in the prior art, more effectively bring into play the advantage of LED dimming energy-saving.
The utility model content
For addressing the above problem, the purpose of the utility model is to provide a kind of Dimmable LED fluorescent lamp drive circuit, is used for need not transforming under the prerequisite of switch panel, realizes the tunable optical of LED fluorescent lamp, further brings into play the power savings advantages of LED fluorescent lamp.
For realizing above-mentioned purpose, the technical scheme of the utility model is:
A kind of Dimmable LED fluorescent lamp drive circuit; Comprise filtering and rectification circuit, constant voltage circuit, step-down constant-current circuit; Also comprise the switch testing circuit; Power supply circuits and control unit, said filtering and rectification circuit link to each other through switch with power input, and the input of said constant voltage circuit links to each other with the output of said filtering and rectification circuit; The output of said constant voltage circuit links to each other with said power supply circuits with said step-down constant-current circuit; The output of said switch testing circuit and said power supply circuits links to each other with said control unit, and the output of said control unit links to each other with the input of said step-down constant-current circuit, and said step-down constant-current circuit output constant current is lighted the LED fluorescent lamp; Whether said control unit connects through said switch testing circuit sense switch; And in timing record switch number of times; Difference according to the switch number of times; The PWM ripple of said control unit output different duty is given said step-down constant-current circuit, and the output current of said step-down constant-current circuit and the proportional relation of PWM ripple duty ratio realize the tunable optical control of LED fluorescent lamp.
Preferably, whether said switch testing circuit is used for sense switch and connects, and outputs level signals.
Preferably, said power supply circuits are that said control unit (MCU) provides power supply, and said power supply circuits comprise an energy storage elements, still can give said control unit (MCU) power supply a period of time when being used for the civil power disconnection.
Preferably, said control unit (MCU) comprises a power down memory element, is used to write down the light modulation last time value of information.
Preferably, said control unit (MCU) adopts the control chip with PWM module and interrupt module.
Compare with the constant-current driving LED power supply that prior art adopts, the utility model beneficial effect is following:
(1) existing Dimmable LED fluorescent lamp all need cooperate corresponding dimmer to use; The scheme of the utility model is through the number of times of single switch in a period of time; Export different constant current values, under the prerequisite that need not transform existing switch panel, realize the tunable optical of LED fluorescent lamp.
(2) do not need dimmer, further reduced cost, more help the marketing of LED fluorescent lamp.
(3) constant current dicyclo control after the first constant voltage of employing; More can closing to reality transient state situation; Especially in emergency case such as reply power network fluctuation etc. when disturbing, guarantee the stable of driving power output with accurately, realized current with high accuracy/voltage output; Make drive current, driving voltage can both reach best matching effect, solved the problem of bringing owing to the inconsistency of himself during LED uses the LED of different LED wicks, an order and different model.
Description of drawings
Fig. 1 is the theory diagram of Dimmable LED fluorescent lamp drive circuit;
Fig. 2 is the control flow chart of Dimmable LED fluorescent lamp drive circuit.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
On the contrary, the utility model is contained any alternative, the modification of on the marrow of the utility model and scope, making, equivalent method and scheme by claim definition.Further, the utility model is had a better understanding in order to make the public, in hereinafter the details of the utility model being described, detailed some specific detail sections of having described.There is not the description of these detail sections can understand the utility model fully for a person skilled in the art yet.
Referring to Fig. 1, the Dimmable LED fluorescent lamp drive circuit 100 of the utility model embodiment comprises: filtering and rectification circuit 101, constant voltage circuit 102, step-down constant-current circuit 103, switch testing circuit 104, power supply circuits 105, control unit (MCU) 106.Present embodiment input ac voltage scope is 85Vac-264Vac; Generally link to each other with filtering and rectification circuit 101 through switch 200 by electric main; The output of switch 200 links to each other with switch testing circuit 104; Constant voltage circuit 102 links to each other with the output of filtering and rectification circuit 101, and the output of constant voltage circuit 102 is connected with power supply circuits 105 with step-down constant-current circuit 103, and the output of switch testing circuit 104 and power supply circuits 105 links to each other with control unit (MCU) 106; The output of control unit (MCU) 106 links to each other with step-down constant-current circuit 103, and step-down constant-current circuit 103 output constant currents are lighted LED fluorescent lamp 300.Its operation principle is following, and electric main links to each other through the input of switch 200 with Dimmable LED fluorescent lamp drive circuit 100, and the output of Dimmable LED fluorescent lamp drive circuit 100 links to each other with LED fluorescent lamp 300, and the output constant current is lighted LED fluorescent lamp 300.The connecting and disconnecting of switch 200 control electric mains.When switch 200 was connected, electric main was input to constant voltage circuit 102 and exports certain voltage through the filtering and the rectification of filtering and rectification circuit 101, was input to step-down constant-current circuit 103 output constant currents; In addition, power supply circuits 105 link to each other with the output of constant voltage circuit 102, for control unit (MCU) 106 provides the chip-scale low voltage power supply.Whether switch testing circuit 104 is used for sense switch 200 and presses; Control unit (MCU) 106 is the statistic switch number of times regularly; Numerical value according to the switch number of times; The PWM ripple of control unit (MCU) 106 output different duty, the constant current value of control step-down constant-current circuit 103 outputs, and then the brightness of control LED fluorescent lamp 300.The brightness of LED fluorescent lamp 300 is directly proportional with the constant current value of step-down constant-current circuit 103 outputs, and this constant current value is directly proportional by the duty ratio with control unit (MCU) 106 output PWM ripples, therefore only needs to regulate the duty ratio of PWM ripple, just can realize tunable optical.
Referring to Fig. 2 is the brightness adjustment control flow process of present embodiment, after powering on, has judged whether switch connection, if switch connection, the opening timing device detects the switch number of times in timing, preserves the switch number of times and controls the duty ratio of PWM ripple.With real data explanation downward modulation photoreduction process, with regularly 2 seconds be example, if in 2 seconds switch 1 time, then control unit is exported with 100% duty ratio; If switch is 2 times in 2 seconds, then control unit is exported with 50% duty ratio; If switch is 3 times in 2 seconds, then control unit is exported with 30% duty ratio.The concrete numerical value and the proportionate relationship of actual timing, output duty cycle value and switch number of times can be configured according to the user time needs.
Present embodiment power supply circuits 105 provide power supply for control unit (MCU) 106; When electric main breaks off, can also supply power a period of time for single-chip microcomputer, therefore; Power supply circuits should comprise the element of a storage power; Such as capacitor,, also can discharge to control unit (MCU) 106 power supplies through capacitor even civil power breaks off.
Present embodiment control unit (MCU) but 106 comprise power down storage ROM, the light modulation value of record last time when opening next time, if carry out the light modulation operation, is then directly lighted the LED fluorescent lamp with light modulation last time value.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; 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. a Dimmable LED fluorescent lamp drive circuit comprises filtering and rectification circuit, constant voltage circuit; The step-down constant-current circuit; It is characterized in that, also comprise the switch testing circuit, power supply circuits and control unit; Said filtering and rectification circuit link to each other through switch with power input; The input of said constant voltage circuit links to each other with the output of said filtering and rectification circuit, and the output of said constant voltage circuit links to each other with said power supply circuits with said step-down constant-current circuit, and the output of said switch testing circuit and said power supply circuits links to each other with said control unit; The output of said control unit links to each other with the input of said step-down constant-current circuit, and said step-down constant-current circuit output constant current is lighted the LED fluorescent lamp; Whether said control unit connects through said switch testing circuit sense switch; And in timing record switch number of times; Difference according to the switch number of times; The PWM ripple of said control unit output different duty is given said step-down constant-current circuit, and the output current of said step-down constant-current circuit and the proportional relation of PWM ripple duty ratio realize the tunable optical control of LED fluorescent lamp.
2. Dimmable LED fluorescent lamp drive circuit according to claim 1 is characterized in that, whether said switch testing circuit is used for sense switch and connects, and outputs level signals.
3. Dimmable LED fluorescent lamp drive circuit according to claim 1; It is characterized in that; Said power supply circuits are that said control unit provides power supply, and said power supply circuits comprise an energy storage elements, are used for giving said control unit power supply a period of time when civil power breaks off.
4. Dimmable LED fluorescent lamp drive circuit according to claim 1 is characterized in that said control unit comprises a power down memory element, is used to write down the light modulation last time value of information.
5. Dimmable LED fluorescent lamp drive circuit according to claim 1 is characterized in that, said control unit adopts the control chip with PWM module and interrupt module.
CN2012202805726U 2012-06-08 2012-06-08 Driving circuit of LED (light-emitting diode) fluorescent lamp with adjustable light Expired - Fee Related CN202603016U (en)

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CN2012202805726U CN202603016U (en) 2012-06-08 2012-06-08 Driving circuit of LED (light-emitting diode) fluorescent lamp with adjustable light

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Application Number Priority Date Filing Date Title
CN2012202805726U CN202603016U (en) 2012-06-08 2012-06-08 Driving circuit of LED (light-emitting diode) fluorescent lamp with adjustable light

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103687217A (en) * 2013-11-29 2014-03-26 上海亚明照明有限公司 Switching and dimming LED driving circuit
CN103731961A (en) * 2014-01-06 2014-04-16 陈云 Intelligent dimming LED (Light Emitting Diode) lighting system
CN104411061A (en) * 2014-11-28 2015-03-11 深圳市明微电子股份有限公司 Driving device, lamp and driving method
CN105987363A (en) * 2015-03-05 2016-10-05 西门子(中国)有限公司 Switch
CN106376129A (en) * 2016-09-29 2017-02-01 普天智能照明研究院有限公司 Regulating circuit and regulating method for LED
CN108525072A (en) * 2015-06-10 2018-09-14 安溪县海宏生物科技有限公司 A kind of transfusion monitoring device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103687217A (en) * 2013-11-29 2014-03-26 上海亚明照明有限公司 Switching and dimming LED driving circuit
CN103687217B (en) * 2013-11-29 2015-11-18 上海亚明照明有限公司 A kind of switch dimming LED drive circuit
CN103731961A (en) * 2014-01-06 2014-04-16 陈云 Intelligent dimming LED (Light Emitting Diode) lighting system
CN104411061A (en) * 2014-11-28 2015-03-11 深圳市明微电子股份有限公司 Driving device, lamp and driving method
CN105987363A (en) * 2015-03-05 2016-10-05 西门子(中国)有限公司 Switch
CN105987363B (en) * 2015-03-05 2019-03-12 西门子(中国)有限公司 Switch
CN108525072A (en) * 2015-06-10 2018-09-14 安溪县海宏生物科技有限公司 A kind of transfusion monitoring device
CN106376129A (en) * 2016-09-29 2017-02-01 普天智能照明研究院有限公司 Regulating circuit and regulating method for LED

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Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model
EE01 Entry into force of recordation of patent licensing contract

Assignee: WUHAN HIMALAYA PHOTOELECTRIC TECHNOLOGY CO., LTD.

Assignor: Wu Wenwen

Contract record no.: 2014330000333

Denomination of utility model: Driving circuit of LED (light-emitting diode) fluorescent lamp with adjustable light

Granted publication date: 20121212

License type: Exclusive License

Record date: 20140820

LICC Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20121212

Termination date: 20150608

EXPY Termination of patent right or utility model