CN201937925U - LED constant current driver with function of voltage reduction - Google Patents

LED constant current driver with function of voltage reduction Download PDF

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Publication number
CN201937925U
CN201937925U CN2011200216718U CN201120021671U CN201937925U CN 201937925 U CN201937925 U CN 201937925U CN 2011200216718 U CN2011200216718 U CN 2011200216718U CN 201120021671 U CN201120021671 U CN 201120021671U CN 201937925 U CN201937925 U CN 201937925U
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China
Prior art keywords
control circuit
resistance
links
down control
capacitor
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Expired - Fee Related
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CN2011200216718U
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Chinese (zh)
Inventor
苗红霞
齐本胜
牛玉祥
翟潘飞
邓志祥
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Hohai University Changzhou Campus
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Hohai University Changzhou Campus
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Priority to CN2011200216718U priority Critical patent/CN201937925U/en
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Publication of CN201937925U publication Critical patent/CN201937925U/en
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Abstract

The utility model discloses an LED constant current driver with the function of decompression, which is arranged between a power supply and a load. The LED constant current driver with the function of voltage reduction is characterized by comprising a current limiting circuit, a voltage reduction control circuit, a frequency setting circuit and a constant current control circuit; an output end of the current limiting circuit is electrically connected with an input end of the voltage reduction control circuit; another input end of the voltage reduction control circuit is electrically connected with an output end of the frequency setting circuit; another input end of the voltage reduction control circuit is electrically connected with an output end of the constant current control circuit. The LED constant current driver can satisfy the requirements of expected brightness, can guarantee the coincidence of brightness and color of each LED, simultaneously can avoid that the drive current exceeds the maximal rated value, and has good reliability; and the LED constant current driver further has the advantages of reducing input voltage to the required voltage, improving the utilization rate of energy and the like.

Description

A kind of LED constant-flow driver with buck functionality
Technical field
The utility model relates to a kind of led driver, is specifically related to a kind of LED constant-flow driver with buck functionality.
Background technology
Because LED(Light Emitting Diode is a light-emitting diode) be the semiconductor device of characteristic sensitivity, have negative temperature characteristic again, thereby in application process, need to stablize its operating state, thereby produced the notion that drives.Near harshness, LED can directly connect the alternating current of 220V unlike common incandescent lamp bulb to the LED device to the requirement of driving power.LED is a low voltage drive, must design complicated translation circuit, and the LED lamp of different purposes will be equipped with different power supply adaptors.Along with the client is more and more higher to efficient conversion, effective power, constant current accuracy, power source life, the electromagnetic compatibility requirements of LED driving power, design a good power supply and must take all factors into consideration these factors, equally important because the effect of power supply in whole light fixture just looks like human heart.Because the discreteness of LED voltage-current characteristic, not only the LED voltage-current characteristic of the same wattage of different manufacturers production is different, and its voltage-current characteristic of the LED of the same model of same manufacturer production also is different.Adopted the constant voltage source power supply in use, the electric current that obviously flows through each LED is all different in the past, and the brightness of each LED is also just different.So can not adopt the constant voltage source power supply.Though and another led driver is a constant-current driving, but do not have buck functionality, greatly energy dissipation with current-limiting resistance that the LED that is driven links to each other on.What have has a buck functionality, but does not adopt the DC/DC step-down, and capacity usage ratio is very low.Therefore, be necessary to develop a kind of brightness requirement that can satisfy expection, and guarantee the consistency of each LED brightness, colourity, have the drive current of avoiding simultaneously and exceed maximum rating and then influence its reliability, can also adopt the DC/DC voltage transformation input voltage to be depressurized to the constant-flow driver of advantages such as required voltage in addition.
Summary of the invention
The purpose of this utility model is to provide a kind of brightness requirement that can satisfy expection, and guarantee the consistency of each LED brightness, colourity, have the drive current of avoiding simultaneously and exceed maximum rating and then influence its reliability, can also be depressurized to input voltage the constant-flow driver of advantages such as required voltage in addition.
In order to achieve the above object, the technical solution adopted in the utility model is: a kind of LED constant-flow driver with buck functionality, be connected between power supply and the load, it is characterized in that: comprise current-limiting circuit, step-down control circuit, frequency setting circuit and constant-current control circuit, the output of described current-limiting circuit is electrically connected with the input of step-down control circuit, another input of step-down control circuit is electrically connected with the output of frequency setting circuit, and the another input of step-down control circuit is electrically connected with the output of constant-current control circuit.
Further technical scheme also comprises:
Described step-down control circuit is by IC chip MC34063, resistance R 1, resistance R 2, capacitor C o, inductance L, Schottky diode D1 and triode TR constitute, one end of resistance R 1 links to each other with the output of current-limiting circuit, the SC switching tube collector terminal of IC chip MC34063 and the collector electrode of triode TR simultaneously, and the other end of resistance R 1 links to each other with the DRI collector electrode drive end of IC chip MC34063; The base stage of triode TR links to each other with the SE switching tube emitter terminal of IC chip MC34063 and an end of resistance R 2 simultaneously, and the other end of resistance R 2 links to each other with ground; The emitter of triode TR links to each other with an end of inductance L and the negative pole of Schottky diode D1 simultaneously, and the other end of inductance L links to each other with the end of capacitor C o and the positive pole of load simultaneously, and the positive pole of Schottky diode D1 links to each other with ground; The other end ground connection of capacitor C o.
Described current-limiting circuit is made of resistance R sc, and the end of resistance R sc links to each other with the end of power supply and filter capacitor C1 simultaneously, and the other end of resistance R sc is electrically connected with the step-down control circuit.
The other end of resistance R sc is electrically connected with an input of step-down control circuit and the IPK current detecting end of IC chip MC34063 simultaneously.
Be made of capacitor C T in the described frequency setting circuit, capacitor C T one end links to each other with the step-down control circuit, the other end ground connection of capacitor C T.
Capacitor C T one end links to each other with the TC timing capacitor end of step-down control circuit IC chip MC34063.
Described constant-current control circuit is made of resistance R 3, and an end of resistance R 3 links to each other the other end ground connection of resistance R 3 with the negative pole of step-down control circuit and load simultaneously.
One end of resistance R 3 is connected with the CII comparator reverse input end of the MC34063 of the IC chip of step-down control circuit.
The utility model can be realized the constant-current driving to LED; guarantee the consistency of each LED brightness, the colourity of connecing; avoid drive current to exceed maximum rating; also can realize protection to battery; prevent that battery from causing battery life to shorten because of over-discharge can, have higher utility, and simple in structure; volume can be accomplished very little, is convenient to directly assemble with device.
Description of drawings
Fig. 1 is the block diagram of the LED constant-flow driver of the utility model band buck functionality;
Fig. 2 is the circuit theory diagrams of the LED constant-flow driver of the utility model band buck functionality.
Embodiment
The embodiment that provides below in conjunction with accompanying drawing is described in further detail the utility model.As shown in Figure 1 and Figure 2, the LED constant-flow driver of band buck functionality of the present utility model comprises current-limiting circuit 1, step-down control circuit 2, frequency setting circuit 3 and constant-current control circuit 4, the output of described current-limiting circuit is electrically connected with an input of step-down control circuit, another input of step-down control circuit is electrically connected with the output of frequency setting circuit, and the another input of step-down control circuit is electrically connected with the output of constant-current control circuit.
In technique scheme, as shown in Figure 2, described step-down control circuit is by IC chip MC34063, resistance R 1, R2, and capacitor C o, inductance L, Schottky diode D1 and triode TR constitute.One end of resistance R 1 links to each other with the output of current-limiting circuit, the SC switching tube collector terminal of IC chip MC34063 and the collector electrode of triode TR simultaneously, and the other end of resistance R 1 links to each other with the DRI collector electrode drive end of IC chip MC34063; The base stage of triode TR links to each other with the SE switching tube emitter terminal of IC chip MC34063 and an end of resistance R 2 simultaneously, and the other end of resistance R 2 links to each other with ground; The emitter of triode TR links to each other with an end of inductance L and the negative pole of Schottky diode D1 simultaneously, and the other end of inductance L links to each other with the end of capacitor C o and the positive pole of load simultaneously, and the positive pole of Schottky diode D1 links to each other with ground; The other end of capacitor C o links to each other with ground.
Described current-limiting circuit is made of resistance R sc, and the end of resistance R sc links to each other with the end of power supply and filter capacitor C1 simultaneously, and the resistance R sc other end is electrically connected with an input of step-down control circuit and the IPK current detecting end of IC chip MC34063 simultaneously.
Be made of capacitor C T in the described frequency setting circuit, capacitor C T one end links to each other with the TC timing capacitor end of IC chip MC34063, and the other end of capacitor C T links to each other with ground.
Described constant-current control circuit is made of resistance R 3, and an end of resistance R 3 links to each other with the CII comparator reverse input end of IC chip MC34063 and the negative pole of load simultaneously, and the other end of resistance R 3 links to each other with ground.
When the utility model uses, power supply one tunnel directly links to each other with the Vcc chip power end of IC chip MC34063, another road is input to the IPK current detecting end of IC chip MC34063, the collector electrode that drives the internal switch pipe and the collector electrode of triode TR simultaneously through the current limliting of current-limiting resistance Rsc, is input to the collector electrode of driving tube in addition through resistance R 1; During entire circuit work, triode TR is the state that is in continuous conducting and ends, and when the TR conducting, Schottky diode D1 ends, and power supply is given induction charging, and this moment, capacitor C o provided energy to load.When TR ends, Schottky diode D1 conducting, this moment, inductance provided energy for capacitor C o and load.Can obtain required constant current between the CII comparator reverse input end of output cathode and chip MC34063, the size of electric current can realize by the size of regulating resistance R 3 as required.When the LED load changes, can feed back to chip CII end by R3, and then can adjust voltage transformation module change output voltage, reach the purpose of constant current with this.The frequency of circuit working can be set by the size that changes capacitor C T in addition.
Below disclose the utility model with preferred embodiment, so it is not in order to restriction the utility model, and all employings are equal to replaces or technical scheme that the equivalent transformation mode is obtained, all drops within the protection range of the present utility model.

Claims (8)

1. LED constant-flow driver with buck functionality, be arranged between power supply and the load, it is characterized in that: comprise current-limiting circuit (1), step-down control circuit (2), frequency setting circuit (3) and constant-current control circuit (4), the output of described current-limiting circuit (1) is electrically connected with the input of step-down control circuit (2), another input of step-down control circuit (2) is electrically connected with the output of frequency setting circuit (3), and the another input of step-down control circuit (2) is electrically connected with the output of constant-current control circuit (4).
2. the LED constant-flow driver of band buck functionality according to claim 1, it is characterized in that: described step-down control circuit (2) is by IC chip MC34063, resistance R 1, resistance R 2, capacitor C o, inductance L, Schottky diode D1 and triode TR constitute, one end of resistance R 1 links to each other with the output of current-limiting circuit (1), the SC switching tube collector terminal of IC chip MC34063 and the collector electrode of triode TR simultaneously, and the other end of resistance R 1 links to each other with the DRI collector electrode drive end of IC chip MC34063; The base stage of triode TR links to each other with the SE switching tube emitter terminal of IC chip MC34063 and an end of resistance R 2 simultaneously, and the other end of resistance R 2 links to each other with ground; The emitter of triode TR links to each other with an end of inductance L and the negative pole of Schottky diode D1 simultaneously, and the other end of inductance L links to each other with the end of capacitor C o and the positive pole of load simultaneously, and the positive pole of Schottky diode D1 links to each other with ground; The other end ground connection of capacitor C o.
3. the LED constant-flow driver of band buck functionality according to claim 1 and 2, it is characterized in that: described current-limiting circuit (1) is made of resistance R sc, the end of resistance R sc links to each other with the end of power supply and filter capacitor C1 simultaneously, and the other end of resistance R sc is electrically connected with step-down control circuit (2).
4. the LED constant-flow driver of band buck functionality according to claim 3 is characterized in that: the other end of resistance R sc is electrically connected with an input of step-down control circuit (2) and the IPK current detecting end of IC chip MC34063 simultaneously.
5. the LED constant-flow driver of band buck functionality according to claim 1 and 2 is characterized in that: described frequency setting circuit (3) is made of capacitor C T, and capacitor C T one end links to each other with step-down control circuit (2), the other end ground connection of capacitor C T.
6. the LED constant-flow driver of band buck functionality according to claim 5 is characterized in that: capacitor C T one end links to each other with the TC timing capacitor end of step-down control circuit (2) IC chip MC34063.
7. the LED constant-flow driver of band buck functionality according to claim 1 and 2, it is characterized in that: described constant-current control circuit (4) is made of resistance R 3, one end of resistance R 3 links to each other the other end ground connection of resistance R 3 with the negative pole of step-down control circuit (2) and load simultaneously.
8. the LED constant-flow driver of band buck functionality according to claim 7 is characterized in that: an end of resistance R 3 is connected with the CII comparator reverse input end of the MC34063 of the IC chip of step-down control circuit (2).
CN2011200216718U 2011-01-24 2011-01-24 LED constant current driver with function of voltage reduction Expired - Fee Related CN201937925U (en)

Priority Applications (1)

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CN2011200216718U CN201937925U (en) 2011-01-24 2011-01-24 LED constant current driver with function of voltage reduction

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103697337A (en) * 2012-09-28 2014-04-02 深圳市海洋王照明工程有限公司 Lamp
CN104066237A (en) * 2014-05-09 2014-09-24 浙江凯耀智能照明科技有限公司 LED driving circuit and driving method
CN104703330A (en) * 2013-12-04 2015-06-10 林万炯 LED lamp power supply circuit
CN104767267A (en) * 2015-03-10 2015-07-08 西安交通大学 Portable power generation equipment based on linear motor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103697337A (en) * 2012-09-28 2014-04-02 深圳市海洋王照明工程有限公司 Lamp
CN104703330A (en) * 2013-12-04 2015-06-10 林万炯 LED lamp power supply circuit
CN104703330B (en) * 2013-12-04 2017-11-17 赛尔富电子有限公司 A kind of LED power supply circuit
CN104066237A (en) * 2014-05-09 2014-09-24 浙江凯耀智能照明科技有限公司 LED driving circuit and driving method
CN104767267A (en) * 2015-03-10 2015-07-08 西安交通大学 Portable power generation equipment based on linear motor

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C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110817

Termination date: 20140124