CN203596948U - LED driving circuit with compatible electronic ballast - Google Patents

LED driving circuit with compatible electronic ballast Download PDF

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Publication number
CN203596948U
CN203596948U CN201320678859.9U CN201320678859U CN203596948U CN 203596948 U CN203596948 U CN 203596948U CN 201320678859 U CN201320678859 U CN 201320678859U CN 203596948 U CN203596948 U CN 203596948U
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China
Prior art keywords
circuit
current
resistance
output
triode
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Expired - Fee Related
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CN201320678859.9U
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Chinese (zh)
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赵国松
苏剑华
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ZHEJIANG CHENHUI GUANGBAO SCIENCE AND TECHNOLOGY Co Ltd
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ZHEJIANG CHENHUI GUANGBAO SCIENCE AND TECHNOLOGY Co Ltd
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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

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Abstract

The utility model discloses an LED driving circuit with a compatible electronic ballast; the LED driving circuit comprises the following circuits: a step down current limiting circuit used for reducing voltage and limiting current of output of the electronic ballast, thereby outputting AC current; a high frequency rectifier circuit used for rectifying the AC current so as to output first DC current; a filter circuit used for filtering the first DC current and outputting the DC current to the LED; a high voltage adsorption circuit connected with an input end of the step down current limiting circuit. The high voltage adsorption circuit comprises the following circuits: a rectifier circuit used for converting the output of the electronic ballast into second DC current; an adsorption circuit adsorbing the second DC current; a switch circuit used for controlling connection/disconnection between the rectifier circuit and the adsorption circuit; a delay circuit used for delay-controlling the switch circuit. The LED driving circuit with the compatible electronic ballast is employed to drive the LED lamp so as to replace an original fluorescent tube, so a power rate of the novel circuit can be only two third of an original power rate under equal luminous flux, thereby saving energy.

Description

A kind of LED drive circuit of compatible electronic ballast
Technical field
The utility model relates to a kind of LED drive circuit, relates in particular to a kind of LED drive circuit of compatible electronic ballast.
Background technology
LED fluorescent tube is also commonly called as LED light pipe, LED fluorescent tube, LED fluorescent lamp, and its light source adopts LED as luminous element.Traditional fluorescent tube claims again fluorescent lamp, and respectively there is a filament at lamp two ends, is filled with micro-argon and thin mercury vapour in fluorescent tube, scribbles fluorescent material on tube inner wall, when gas conduction between two filaments, sends ultraviolet ray, makes fluorescent material send visible ray.Owing to containing heavy metal pollutants " mercury ", make the fluorescent tube scrapped very serious to the pollution of environment.And LED fluorescent tube adopts light-emitting diode as light source, light efficiency is higher, more energy-conservation, longer service life, and more environmental protection.Become the ideal product that the current stage replaces fluorescent tube.
Simultaneously, along with the enhancing of environmental consciousness, more and more higher to energy-conservation requirement, LED is used widely in real life, but the electric ballast using because of original fluorescent lamp also occupies very big market, particularly public place etc., therefore needs a kind of drive circuit that can compatible electronic ballast to carry out driving LED fluorescent tube.
Publication number is the utility model of CN 202514121 U, discloses a kind of LED driving power of compatible electronic ballast, comprises a high pressure absorbing circuit, and described high pressure absorbing circuit comprises a voltage threshold; Described high pressure absorbing circuit is in order to absorb the output voltage of described electric ballast; When described output voltage is during higher than described voltage threshold, described high pressure absorbing circuit absorbs the output voltage of described electric ballast, guarantees that output voltage now can not be passed to LED driving power late-class circuit; In the time that described output voltage is less than described voltage threshold, described high pressure absorbing circuit is not worked, and described output voltage is now passed to late-class circuit.
But LED drive circuit of the prior art is Voltage-output, power consumption is larger.
Utility model content
For above-mentioned situation, the utility model provides a kind of LED drive circuit of compatible electronic ballast,
Can provide stable electric current, to reach energy-conservation object.
A LED drive circuit for compatible electronic ballast, comprising:
Step-down current-limiting circuit, for the output of electric ballast is carried out to step-down and current limliting, output AC electricity;
High-frequency rectification circuit, for described alternating current is carried out to rectification, to export the first direct current;
Filter circuit, for the first described direct current is carried out to filtering, and exports to LED;
High pressure absorbing circuit, is connected with the input of step-down current-limiting circuit, and this high pressure absorbing circuit comprises:
Rectification circuit, for changing into the second direct current by the output of electric ballast;
Absorbing circuit, absorbs the second described direct current;
Switching circuit, for controlling the break-make between described rectification circuit and absorbing circuit;
Delay circuit, for the switching circuit described in time delay control.
The output voltage of electric ballast inputs to step-down current-limiting circuit through fuse, and step-down current-limiting circuit is carried out step-down and current limliting to the output voltage of electric ballast, output AC electricity; Alternating current is carried out rectification by high-frequency rectification circuit, and output direct current, carries out filtering for filter circuit to direct current, provides constant electric current through the direct current of filtering to LED, guarantees the normal work of LED.
The input of step-down current-limiting circuit is connected with rectification circuit, when the moment that electric ballast is lighted LED, can produce instantaneous high pressure, this instantaneous high pressure is after rectification circuit rectification, by the switching circuit of conducting, instantaneous high pressure is inputed to absorbing circuit, this absorbing circuit absorbs described instantaneous high pressure.The ON time of switching circuit is by delay circuit control.
Described step-down current-limiting circuit is made up of a voltage-stabiliser tube and a Capacitance parallel connection; The negative pole of voltage-stabiliser tube is as the input of step-down current-limiting circuit, and the positive pole of voltage-stabiliser tube is as the output of step-down current-limiting circuit.
Described switching circuit is positive-negative-positive triode Q1, and the emitter of triode Q1 is connected with the output of rectification circuit, and the base stage of triode Q1 is connected with delay circuit, and the collector electrode of triode Q1 is connected with the input of absorbing circuit.
Described delay circuit comprises the first resistance R 3, the second resistance R 4, the three resistance R 5 and capacitor C 5; The very input of switching circuit of the transmitting of triode Q1 in described switching circuit, and be connected with one end of the first resistance R 3, the other end of the first resistance R 3 is connected with one end of the 3rd resistance R 5 with capacitor C 5, the second resistance R 4, the other end ground connection of capacitor C 5 and the 3rd resistance R 5, the other end of the second resistance R 4 is connected with the base stage of triode Q1, and the collector electrode of triode Q1 is as the output of switching circuit.
Described absorbing circuit is load resistance R, and one end of resistance R is connected as the input of absorbing circuit and with the output of described switching circuit, other end ground connection.
The size of described capacitor C 5 has determined the length of delay time in delay circuit.
Preferably, described high-frequency rectification circuit adopts high-frequency rectification bridge, lights to adapt to electric ballast the high-frequency current that LED moment produces.
Operation principle of the present utility model: the utility model utilizes the interchange constant-current characteristics of original high-frequency electronic ballast, by step-down current limliting, again by after high-frequency rectification and filtering, provide stable electric current to LED module, wherein, the instantaneous high pressure that high-frequency electronic ballast produces absorbs by high pressure absorbing circuit.
The beneficial effects of the utility model: utilize the LED drive circuit of compatible high frequency electric ballast of the present utility model to carry out driving LED lamp, thereby replace original fluorescent tube, the in the situation that of equal luminous flux, it is original 2/3 that power only has, and reached energy-conservation object.
Accompanying drawing explanation
Fig. 1 is circuit structure block diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of drive part in the utility model.
Fig. 3 is the circuit theory diagrams of the utility model mesohigh absorbing circuit.
Embodiment
In order more specifically to describe the utility model, below in conjunction with the drawings and the specific embodiments, the technical solution of the utility model and relative theory thereof are elaborated.
As shown in Figure 1, the LED drive circuit of a kind of compatible electronic ballast of the present embodiment, comprises the step-down current-limiting circuit connecting successively, and high-frequency rectification circuit, filter circuit, be connected with the high pressure absorbing circuit for absorbing high pressure at the input of step-down current-limiting circuit.
As shown in Figure 2, the output of electric ballast is connected with one end of a fuse F1, and the other end of fuse F1 is connected with the input of step-down current-limiting circuit, and step-down current-limiting circuit is composed in parallel by a voltage-stabiliser tube Z1 and a capacitor C 1; The negative pole of voltage-stabiliser tube is as the input of step-down current-limiting circuit, and the positive pole of voltage-stabiliser tube is as the output of step-down current-limiting circuit; In the present embodiment, capacitor C 1=10nF, voltage-stabiliser tube Z1=33nF, fuse F1=1A/300V.
The output of step-down current-limiting circuit is connected with the input of high-frequency rectification circuit, high-frequency rectification circuit forms high-frequency rectification bridge by 4 identical diode D1~D4, the output of high-frequency rectification bridge is connected with the input of filter circuit, filter circuit is made up of capacitor C 2, the input of capacitor C 2 is connected with the output of high-frequency rectification bridge, the other end ground connection of capacitor C 2.The two ends of capacitor C 2 are parallel with resistance R 1 and resistance R 2, and wherein, resistance R 1 and resistance R 2 are connected.
In the present embodiment, C2=680nF, R1=560K Ω, R2=560K Ω.
As shown in Figure 3, high pressure absorbing circuit is connected with the input of step-down current-limiting circuit, comprises rectification circuit, switching circuit, delay circuit and absorbing circuit.
Rectification circuit is for changing into the second direct current by the output of electric ballast; Absorbing circuit absorbs the second described direct current; Switching circuit is for controlling the break-make between described rectification circuit and absorbing circuit; Delay circuit, for the switching circuit described in time delay control.
Wherein, switching circuit is positive-negative-positive triode Q1; Delay circuit comprises the first resistance R 3, the second resistance R 4, the three resistance R 5 and capacitor C 5; The transmitting of triode Q1 is the input of switching circuit very, and be connected with one end of the first resistance R 3, the other end of the first resistance R 3 is connected with one end of the 3rd resistance R 5 with capacitor C 5, the second resistance R 4, the other end ground connection of capacitor C 5 and the 3rd resistance R 5, the other end of the second resistance R 4 is connected with the base stage of triode Q1, and the collector electrode of triode Q1 is as the output of switching circuit.Absorbing circuit is resistance R, and one end of resistance R is connected with the collector electrode of triode Q1, other end ground connection.
In the present embodiment, the first resistance R 3=680K Ω, the second resistance R 4=100 Ω, the 3rd resistance R 5=1K Ω, capacitor C 5=1uF.Resistance R=100 Ω~100K Ω.
Operation principle of the present utility model is:
The output voltage of electric ballast inputs to step-down current-limiting circuit through fuse, and step-down current-limiting circuit is carried out step-down and current limliting to the output voltage of electric ballast, output AC electric current; Alternating current is carried out rectification by high-frequency rectification circuit, output direct current, for filter circuit, direct current is carried out to filtering, resistance R 1 and resistance R 2 are as built-in load, guaranteeing in non-loaded situation, drive circuit can normally be worked, and DC circuit provides constant electric current to LED, guarantees the normal work of LED.
When the moment that electric ballast is lighted LED, can produce instantaneous high pressure, this instantaneous high pressure is after rectification circuit rectification, and capacitor C 5 starts charging, triode Q1 conducting, absorbing circuit absorbs instantaneous high pressure, and after instantaneous high pressure disappears, capacitor C 5 starts electric discharge, when after triode Q1 cut-off, high pressure absorbing circuit is not worked, and wherein, the capacity of capacitor C 5 has determined the length of delay time.

Claims (6)

1. a LED drive circuit for compatible electronic ballast, is characterized in that: comprising:
Step-down current-limiting circuit, for the output of electric ballast is carried out to step-down and current limliting, output AC electricity;
High-frequency rectification circuit, for described alternating current is carried out to rectification, to export the first direct current;
Filter circuit, for the first described direct current is carried out to filtering, and exports to LED;
High pressure absorbing circuit, is connected with the input of step-down current-limiting circuit, and this high pressure absorbing circuit comprises:
Rectification circuit, for changing into the second direct current by the output of electric ballast;
Absorbing circuit, absorbs the second described direct current;
Switching circuit, for controlling the break-make between described rectification circuit and absorbing circuit;
Delay circuit, for the switching circuit described in time delay control.
2. LED drive circuit as claimed in claim 1, is characterized in that: described step-down current-limiting circuit is made up of a voltage-stabiliser tube and a Capacitance parallel connection; The negative pole of voltage-stabiliser tube is as the input of step-down current-limiting circuit, and the positive pole of voltage-stabiliser tube is as the output of step-down current-limiting circuit.
3. LED drive circuit as claimed in claim 2, it is characterized in that: described switching circuit is positive-negative-positive triode Q1, the emitter of triode Q1 is connected with the output of rectification circuit, the base stage of triode Q1 is connected with delay circuit, and the collector electrode of triode Q1 is connected with the input of absorbing circuit.
4. LED drive circuit as claimed in claim 3, is characterized in that: described delay circuit comprises the first resistance R 3, the second resistance R 4, the three resistance R 5 and capacitor C 5;
The very input of switching circuit of the transmitting of triode Q1 in described switching circuit, and be connected with one end of the first resistance R 3, the other end of the first resistance R 3 is connected with one end of the 3rd resistance R 5 with capacitor C 5, the second resistance R 4, the other end ground connection of capacitor C 5 and the 3rd resistance R 5, the other end of the second resistance R 4 is connected with the base stage of triode Q1, and the collector electrode of triode Q1 is as the output of switching circuit.
5. LED drive circuit as claimed in claim 1, is characterized in that: described absorbing circuit is load resistance R, and one end of resistance R is connected as the input of absorbing circuit and with the output of described switching circuit, other end ground connection.
6. LED drive circuit as claimed in claim 1, is characterized in that: described filter circuit is capacitor C 2.
CN201320678859.9U 2013-10-30 2013-10-30 LED driving circuit with compatible electronic ballast Expired - Fee Related CN203596948U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320678859.9U CN203596948U (en) 2013-10-30 2013-10-30 LED driving circuit with compatible electronic ballast

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320678859.9U CN203596948U (en) 2013-10-30 2013-10-30 LED driving circuit with compatible electronic ballast

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104470086A (en) * 2014-11-21 2015-03-25 浙江晨辉照明有限公司 LED lamp tube power driving circuit and LED lamp tube
CN105282930A (en) * 2015-10-20 2016-01-27 晨辉光宝科技有限公司 Frequency adaptive LED lamp drive circuit
CN105636273A (en) * 2016-02-01 2016-06-01 深圳市豪恩光电照明股份有限公司 LED driving circuit compatible with electronic rectifier and mains supply
WO2016154845A1 (en) * 2015-03-30 2016-10-06 常州明石晶电科技有限公司 Led lamp tube and constant-current drive apparatus thereof
CN106163029A (en) * 2015-03-30 2016-11-23 常州明石晶电科技有限公司 A kind of LED lamp tube and constant current driving device thereof

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104470086A (en) * 2014-11-21 2015-03-25 浙江晨辉照明有限公司 LED lamp tube power driving circuit and LED lamp tube
EP3024303A2 (en) 2014-11-21 2016-05-25 Zhejiang CH Lighting Co., Ltd. Led tube power drive circuit and led tube
CN104470086B (en) * 2014-11-21 2017-06-06 浙江晨辉照明有限公司 A kind of LED lamp tube
WO2016154845A1 (en) * 2015-03-30 2016-10-06 常州明石晶电科技有限公司 Led lamp tube and constant-current drive apparatus thereof
CN106163029A (en) * 2015-03-30 2016-11-23 常州明石晶电科技有限公司 A kind of LED lamp tube and constant current driving device thereof
CN105282930A (en) * 2015-10-20 2016-01-27 晨辉光宝科技有限公司 Frequency adaptive LED lamp drive circuit
CN105282930B (en) * 2015-10-20 2018-10-02 晨辉光宝科技有限公司 A kind of LED lamp drive circuit that frequency is adaptive
CN105636273A (en) * 2016-02-01 2016-06-01 深圳市豪恩光电照明股份有限公司 LED driving circuit compatible with electronic rectifier and mains supply
CN105636273B (en) * 2016-02-01 2019-06-07 深圳市豪恩智能物联股份有限公司 A kind of LED drive circuit of compatible electronic rectifier and alternating current

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Legal Events

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

Assignee: Zhejiang Chenhui photo Co. Ltd.

Assignor: Zhejiang Chenhui Guangbao Science and Technology Co., Ltd.

Contract record no.: 2014330000246

Denomination of utility model: LED driving circuit with compatible electronic ballast

Granted publication date: 20140514

License type: Exclusive License

Record date: 20140625

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: 20140514

Termination date: 20191030

CF01 Termination of patent right due to non-payment of annual fee