CN201374838Y - LED driving power source - Google Patents

LED driving power source Download PDF

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Publication number
CN201374838Y
CN201374838Y CN200920135544U CN200920135544U CN201374838Y CN 201374838 Y CN201374838 Y CN 201374838Y CN 200920135544 U CN200920135544 U CN 200920135544U CN 200920135544 U CN200920135544 U CN 200920135544U CN 201374838 Y CN201374838 Y CN 201374838Y
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China
Prior art keywords
unit
constant current
current control
output
led
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Expired - Fee Related
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CN200920135544U
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Chinese (zh)
Inventor
朱庆山
何耀颐
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Sichuan Jiuzhou Optoelectronics Technology Co Ltd
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SICHUAN JM SOLID-STATE LIGHTING Co Ltd
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Abstract

The utility model discloses an LED driving power source, which comprises a rectifying filter unit, an output unit, a constant current unit and a thermal detection unit, wherein the output unit comprises an energy storage unit and a filter unit, and the constant current unit comprises a switch unit and a constant current control unit. The thermal detection unit detects working temperature of an LED illuminating device and feeds back the working temperature to the constant current control unit connected with the thermal detection unit, and the constant current control unit controls on or off of the switch unit according to feedback signals. When the working temperature of the LED illuminating device is over high, the constant current control unit can turn off the switch unit according to feedback of the thermal detection unit to cut off alternating current and utilize the energy storage unit to supply power, and then current flowing through an LED light source and other portions of circuits of the power source is reduced, thereby reducing heating valve of the LED illuminating device to prevent the LED illuminating device from a high-temperature working state, and guaranteeing working effect and service life of the LED illuminating device.

Description

A kind of LED driving power
Technical field
The utility model relates to the LED lighting technical field, refers in particular to a kind of LED driving power.
Background technology
Led light source has plurality of advantages such as low energy consumption, environmental protection, long service life, and progressively replaces conventional light source in the application such as aspects such as illuminations, becomes the solid state lighting electric light source of a new generation.For performance and the minimizing failure rate of giving full play to the LED lighting device, used driving power fibrous root designs according to the LED self-characteristic, to satisfy the required driving requirement of LED work as far as possible.Yet, the performance of present various LED driving powers is unsatisfactory, as shown in Figure 1, it is the functional-block diagram of common LED driving power, this LED driving power includes a rectification filtering unit 11, and it will carry out rectification and filtering from the alternating current that AC side is obtained and form behind the direct current as the input of constant current unit 13, and the 13 pairs of direct currents of being imported in constant current unit are handled, convert the output of constant current voltage to, after a filter unit 15 is done further filtering, be used for driving LED light source 17.This driving power uses the constant current unit to carry out current limliting, can reduce the influence that the LED drive current is subjected to voltage fluctuation greatly, but, LED lighting device (particularly led light source wherein) can produce a large amount of heats in the process of work, but can't be as the LED driving power of above-mentioned type and drive current is adjusted according to the variation of ambient temperature, like this, accumulate too much heat easily and make the working temperature of LED lighting device too high, influence its task performance and useful life.
Summary of the invention
The purpose of this utility model is to overcome the existing existing defective of LED driving power, and a kind of LED driving power is provided, and it detects the working temperature of LED lighting device, in view of the above drive current is regulated.
The utility model is by following technical solution and realizes above-mentioned purpose: a kind of LED driving power includes a constant current unit and a hot detecting unit that output unit, that a rectification filtering unit, includes energy-storage units and filter unit includes switch element and constant current control unit.Wherein, described rectification filtering unit is connected with AC power, is used for alternating current is changed into direct current; Described energy-storage units and led light source connect into the loop; Described filter unit is connected between rectification filtering unit, energy-storage units and the led light source, is used for the direct current that comes from rectification filtering unit or energy-storage units is carried out filtering; Described switch element is connected in output unit, when the switch element conducting, and by AC power driving LED light source, and to energy-storage units charging, when switch element turn-offs, cut-out AC power and by energy-storage units driving LED light source; Described constant current control unit is gathered the signal from output unit, and the conducting or the shutoff of control switch unit in view of the above; Described hot detecting unit detects the working temperature of LED lighting device and feeds back to the constant current control unit that is attached thereto, and the constant current control unit is controlled the conducting or the shutoff of described switch element according to this feedback signal.
In the above-mentioned LED driving power, described constant current unit is connected in the output of described rectification filtering unit and obtains working power.
In the above-mentioned LED driving power, be connected with a voltage regulation unit between described constant current unit and the described rectification filtering unit.
The beneficial effects of the utility model are: the constant current control unit of LED driving power is connected with the hot detecting unit that is used to detect the LED lighting device, when the working temperature of LED lighting device is too high, the constant current control unit can be according to the feedback of hot detecting unit and the stopcock unit, cut off AC power and change by energy-storage units and power, the electric current of feasible flow through led light source and other partial circuits of power supply reduces, thereby reduce the caloric value of LED lighting device, to avoid it to be in the hot operation state, guarantee its task performance and useful life.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described further.
Fig. 1 is a kind of functional-block diagram of existing LED driving power.
Fig. 2 is the functional-block diagram of a kind of LED driving power of the utility model.
Fig. 3 is the circuit diagram of a kind of LED driving power of the utility model
Embodiment
The utility model discloses a kind of LED driving power, and it can be applicable to the lighting device such as LED shot-light, LED flashlight etc.
Consult shown in Figure 2ly, this LED driving power mainly is made of a rectification filtering unit 10, an output unit 12, a constant current unit 14 and a hot detecting unit 16.
The input of rectification filtering unit 10 is connected with AC power 20, is used for the alternating current that will be imported and converts direct current output to through rectification, Filtering Processing.
Output unit 12 includes an energy-storage units 120 and a filter unit 122.Wherein, energy-storage units 120 connects into the loop with led light source 30; Filter unit 122 is connected between rectification filtering unit 10, energy-storage units 120 and the led light source 30, it carries out being delivered to led light source 30 after the Filtering Processing to the direct current that comes from rectification filtering unit 10 or energy-storage units 120, drive that it is luminous, to play the usefulness of illumination.
Constant current unit 14 includes a switch element 140 and a constant current control unit 142, wherein, switch element 140 is connected in output unit 12, working morphology by the conducting/off state controlling and driving power supply of switch element 140, when switch element 140 conductings, the alternating current that AC power 20 is exported is handled rear drive led light source 30 through rectification filtering unit 10, filter unit 122, and to energy-storage units 120 chargings, when switch element 140 turn-offs, cut off AC power 20 and by led light source 30 power supplies of energy-storage units 120 for being attached thereto into the loop.
The signal that constant current control unit 142 is gathered from output unit 12, and the conducting or the shutoff of control switch unit 140 in view of the above.Like this, by the conducting/shutoff circulation of switch element 140, the drive current of adjusting the led light source 30 of flowing through is within certain scope, thus the purpose of realization constant-current driving.
Hot detecting unit 16 detects the working temperature of LED lighting devices, and feeds back to the constant current control unit 142 that is attached thereto, and constant current control unit 142 is according to the feedback signal of hot detecting unit 16 and the conducting or the shutoff of control switch unit 140.Like this, when the working temperature of LED lighting device is too high, constant current control unit 142 can be according to the feedback of hot detecting unit 16 and stopcock unit 140, cut off AC power 20 and change and power by energy-storage units 120, the electric current of feasible flow through led light source 30 and other partial circuits of power supply reduces, thereby reduce the caloric value of LED lighting device, be in the hot operation state to avoid it.
When constant current unit 14 needs external power source to drive, it can be connected in the output of rectification filtering unit 10 and obtain working power, preferably, between has access to a voltage regulation unit 18, it plays pressure stabilization function to the electric current by rectification filtering unit 10 output, and provides stable working power for constant current unit 14.
In conjunction with shown in Figure 3, so that a kind of preferred enforcement circuit of the present utility model to be described.
Rectification filtering unit 10 is made of a rectifier bridge and a filter capacitor C1.Rectifier bridge is a full-wave rectification bridge of being pressed the form connection of full-wave bridge rectifier circuit by four rectifier diode D1, D2, D3, D4, the positive and negative electrode of the ac input end of rectifier bridge is connected with the positive and negative electrode of AC power 20 respectively, insert output unit 12, the dc output end minus earth behind the anodal connection of the dc output end filter capacitor C1.Like this, by rectifier bridge, convert the alternating voltage of importing to pulse voltage.The end of filter capacitor C1 is connected in the dc output end positive pole of rectifier bridge, other end ground connection, and it carries out smothing filtering to the pulse voltage that comes from rectifier bridge and forms direct voltage.Preferably, filter capacitor C1 adopts the electrochemical capacitor of the branch with positive-negative polarity, and it has the advantage that capacitance is big, price is low.
Energy-storage units 120 is made of an inductance L 1 and a rectifier diode D6, and wherein, an end of inductance L 1 is connected in the output of led light source 30, and the other end is connected in the positive pole of rectifier diode D6, and the negative pole of rectifier diode D6 is connected in the input of led light source 30.
Filter unit 122 is made of a filter capacitor C3, and the termination of filter capacitor C3 is gone between the input of the negative pole of rectifier diode D6 and led light source 30, and the other end inserts between the output of inductance L 1 and led light source 30.Preferably, filter capacitor C3 also adopts electrochemical capacitor.
When being in AC power 20 power supply states, alternating current is done further smothing filtering through filter capacitor C3 again behind rectifier bridge, filter capacitor C1 rectifying and wave-filtering, and driving LED light source 30 is simultaneously to inductance L 1 charging; When being in energy-storage units 120 power supply states, electric energy self-inductance L1 flows out, after rectifier diode D6 rectification, again through filter capacitor C3 filtering and driving LED light source 30.
Switch element 140 includes two array transistor Q2 that a technotron Q3 and is made of a NPN type triode and a positive-negative-positive triode of emitter mutual connection, and constant current control unit 142 includes a constant current control chip U1, one first sampling resistor R3 and one second sampling resistor R4.Wherein, the drain electrode of technotron Q3 is connected in the inductance L 1 of energy-storage units 120, source electrode is connected in the detection pin Isense of constant current control chip U1 after by the first sampling resistor R3, the second sampling resistor R4, and grid is connected between the emitter of two triodes of two array transistor Q2; The first sampling resistor R3 is series between the detection pin Isense of the source electrode of technotron Q3 and constant current control chip U1, the end of the second sampling resistor R4 is connected between the detection pin Isense of the source electrode of technotron Q3 and constant current control chip U1, other end ground connection; The collector electrode of the NPN type triode of two array transistor Q2 is connected in the output of voltage regulation unit 18, the collector electrode of positive-negative-positive triode connects the first sampling resistor R3, the second sampling resistor R4, the base stage of two triodes all is connected in the driving pin Vdrive of constant current control chip U1, and the grid of technotron Q3 is connected between the emitter of two triodes of two array transistor Q2; The power pins Vcc of constant current control chip U1 is connected in the output of voltage regulation unit 18 and obtains working power.
By the setting of two array transistor Q2, improve the transient response performance of technotron Q3, make it have the reactive switches time faster.
Voltage regulation unit 18 is made up of a triode Q1, a resistance R 1, a voltage stabilizing didoe D5 and a capacitor C 2, wherein, the base stage of triode Q1 is connected in the output of rectification filtering unit 10 by resistance R 1, collector electrode is connected in the output of rectification filtering unit 10, and emitter connects an end of capacitor C 2; One end of capacitor C 2 is connected in the emitter of triode Q1, other end ground connection; The base stage of the positive pole of voltage stabilizing didoe D5 and triode Q1 is connected in resistance R 1, minus earth jointly.Voltage regulation unit two-way output in 18 fens, the one tunnel is connected in the power pins Vcc of constant current control chip U1, and another road is connected in the collector electrode of the NPN type triode of two array transistor Q2.
Like this, the work shape of coming the controlling and driving power supply by the switch of technotron Q3, thus realize the purpose of constant-current driving LED light source 30.When technotron Q3 conducting, the alternating current of AC power 20 is through rectifier bridge, filter capacitor C1, filter capacitor C3 rear drive led light source 30, and to inductance L 1 charging, if detecting its voltage that detects pin Isense, constant current control chip U1 is higher than default threshold voltage (for example 19mV), then its output voltage that drives pin Vdrive becomes low, cause two array transistor Q2 to turn-off, thereby turn-off technotron Q3, at this moment, AC power 20 is cut off, 1 electric energy stored of inductance L is through rectifier diode D6 rectification, filter capacitor C3 filtering rear drive led light source 30 is luminous, if detecting its voltage that detects pin Isense, constant current control chip U1 is lower than default threshold voltage (for example 19mV), then its output voltage that drives pin Vdrive becomes height, cause two array transistor Q2 to open, thereby open technotron Q3, get back to aforesaid working morphology.So, by unlatching/shutoff of technotron Q3, and the electric current of driving LED light source 30 is maintained within the constant current range.
Hot detecting unit 16 is that a NTC thermistor R2 constitutes, and the end of thermistor R2 is connected in the emitter of the triode Q1 of voltage regulation unit 22, and the other end is connected in the detection pin Isense of constant current control chip U1.
Working temperature rising when the LED lighting device, the resistance of thermistor R2 reduces, like this, the voltage that is divided on the first sampling resistor R3 increases, constant current control chip U1 detects its voltage that detects pin Isense and is higher than default threshold voltage, and it is driven the output voltage step-down of pin Vdrive, off switch unit 140, thereby cut off external AC power supply 20 and luminous by inductance L 1 driving LED light source 30, feasible electric current by led light source 30 reduces, and its caloric value and, avoid the working temperature of LED lighting device too high along with reduction.
Above-mentioned only is preferred embodiment of the present utility model; but not the utility model is done any pro forma restriction; for example; those of ordinary skill can be changed on the basis of foregoing circuit or be modified; all equivalent variations or modifications of being done in the claim scope all should fall within the utility model protection range.

Claims (10)

1, a kind of LED driving power, include the constant current unit (14) that output unit (12) and that a rectification filtering unit (10), includes energy-storage units (120) and filter unit (122) includes switch element (140) and constant current control unit (142), wherein
Described rectification filtering unit (10) is connected with AC power, is used for alternating current is changed into direct current;
Described energy-storage units (120) connects into the loop with led light source;
Described filter unit (122) is connected between rectification filtering unit (10), energy-storage units (120) and the led light source (30), is used for the direct current that comes from rectification filtering unit (10) or energy-storage units (120) is carried out filtering;
Described switch element (140) is connected in output unit (12), when switch element (140) conducting,, and energy-storage units (120) charged by AC power driving LED light source, when switch element (140) turn-offs, cut off AC power and by energy-storage units (120) driving LED light source;
Described constant current control unit (142) is gathered the signal from output unit (12), and the conducting or the shutoff of control switch unit (140) in view of the above;
It is characterized in that: described constant current control unit (142) also is connected with one and is used to detect the hot detecting unit (16) of the working temperature of LED lighting device, and controls the conducting or the shutoff of described switch element (140) according to the feedback signal of described hot detecting unit (16).
2, LED driving power as claimed in claim 1 is characterized in that: described constant current unit (14) is connected in the output of described rectification filtering unit (10) and obtains working power.
3, LED driving power as claimed in claim 2 is characterized in that: be connected with a voltage regulation unit (18) between described constant current unit (14) and the described rectification filter unit (10).
4, LED driving power as claimed in claim 3 is characterized in that: described hot detecting unit (16) is a thermistor (R2).
5, LED driving power as claimed in claim 4, it is characterized in that: described energy-storage units (120) is made of an inductance (L1) and a rectifier diode (D6), wherein, one end of described inductance (L1) is connected in the output of led light source, the other end is connected in the positive pole of described rectifier diode (D6), and the negative pole of described rectifier diode (D6) is connected in the input of led light source; Described filter unit (122) is made of a filter capacitor (C3), one termination of described filter capacitor (C3) is gone between the input of the negative pole of described rectifier diode (D6) and led light source, and the other end inserts between the output of described inductance (L1) and led light source.
6, LED driving power as claimed in claim 5, it is characterized in that: described switch element (140) includes two array transistors (Q2) that a technotron (Q3) and is made of a NPN type triode and a positive-negative-positive triode of emitter mutual connection, described constant current control unit (142) includes a constant current control chip (U1), one first sampling resistor (R3) and one second sampling resistor (R4), wherein, the drain electrode of described technotron (Q3) is connected in inductance (L1), source electrode is by first sampling resistor (R3), be connected in the detection pin (Isense) of constant current control chip (U1) behind second sampling resistor (R4), grid is connected between two emitters of two array transistors (Q2); Described first sampling resistor (R3) is series between the detection pin (Isense) of the source electrode of technotron (Q3) and constant current control chip (U1), one end of described second sampling resistor (R4) is connected between the detection pin (Isense) of the source electrode of technotron (Q3) and constant current control chip (U1), other end ground connection; The collector electrode of the NPN type triode of described pair of array transistor (Q2) is connected in the output of voltage regulation unit (18), and the collector electrode of positive-negative-positive triode connects first sampling resistor (R3), second sampling resistor (R4), and the base stage of two triodes all is connected in the driving pin (Vdrive) of constant current control chip (U1); The power pins (Vcc) of described constant current control chip (U1) is connected in the output of voltage regulation unit (18) and obtains working power.
7, LED driving power as claimed in claim 6, it is characterized in that: described voltage regulation unit (18) includes a triode (Q1), a resistance (R1), a voltage stabilizing didoe (D5) and an electric capacity (C2), wherein, the base stage of described triode (Q1) is connected in the output of rectification filtering unit (10) by resistance (R1), collector electrode is connected in the output of rectification filtering unit (10), and emitter connects an end of electric capacity (C2); One end of electric capacity (C2) is connected in the emitter of triode (Q1), other end ground connection; The base stage of the positive pole of voltage stabilizing didoe (D5) and triode (Q1) is connected in resistance (R1), minus earth jointly; Voltage regulation unit (18) divides two-way output, and one the tunnel is connected in the power pins (Vcc) of constant current control chip (U1), and another road is connected in the collector electrode of the NPN type triode of two array transistors (Q2).
8, LED driving power as claimed in claim 6 is characterized in that: described thermistor (R2) is connected between the detection pin (Isense) of the emitter of triode (Q1) of described voltage regulation unit (22) and described constant current control chip (U1).
9, LED driving power as claimed in claim 6 is characterized in that: described rectification filtering unit (10) is that a rectifier bridge and a filter capacitor (C1) constitute.
10, LED driving power as claimed in claim 9 is characterized in that: the filter capacitor (C1) of described rectification filtering unit (10) is an electrochemical capacitor.
CN200920135544U 2009-03-11 2009-03-11 LED driving power source Expired - Fee Related CN201374838Y (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101808454A (en) * 2010-04-27 2010-08-18 海洋王照明科技股份有限公司 LED driving device and LED light-emitting device
CN102056376A (en) * 2010-11-01 2011-05-11 贵阳世纪天元科技有限公司 Method for increasing LED luminous efficiency
CN102297376A (en) * 2010-06-28 2011-12-28 东芝照明技术株式会社 Led lamp system
WO2012071733A1 (en) * 2010-12-02 2012-06-07 深圳矽睿芯科技有限公司 Led driving power supply circuit, driving power supply and lighting device
CN103002643A (en) * 2012-11-27 2013-03-27 杭州科凡照明电器有限公司 Constant-current drive circuit used for LED (Light Emitting Diode) lamp
CN103025014A (en) * 2012-12-12 2013-04-03 宁波市镇海华泰电器厂 Light-emitting diode (LED) lamp driving power supply with functions of lightning resistance and automatic temperature control
CN103517498A (en) * 2012-06-26 2014-01-15 海洋王照明科技股份有限公司 Intelligent temperature-controlled light-modulation control circuit of LED electric torch
WO2014079134A1 (en) * 2012-11-23 2014-05-30 上海顿格电子贸易有限公司 Led constant current power supply circuit
CN103957632A (en) * 2014-04-25 2014-07-30 桂林市啄木鸟医疗器械有限公司 Constant-current control circuit of light curing machine LED lamp
CN104023446A (en) * 2014-06-16 2014-09-03 朱威 Power source control device for indoor illuminating lamp
CN102131324B (en) * 2010-01-18 2015-03-18 立锜科技股份有限公司 Thermal foldback control circuit and control method of light-emitting diode (LED)
CN104023446B (en) * 2014-06-16 2016-11-30 朱威 A kind of power control of indoor illumination
CN110351931A (en) * 2019-08-09 2019-10-18 浙江阳光美加照明有限公司 A kind of LED drive circuit with small night lamp function
CN112512175A (en) * 2020-10-28 2021-03-16 海宁瑞丰灯头股份有限公司 Constant-current LED driving power supply

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102131324B (en) * 2010-01-18 2015-03-18 立锜科技股份有限公司 Thermal foldback control circuit and control method of light-emitting diode (LED)
CN101808454A (en) * 2010-04-27 2010-08-18 海洋王照明科技股份有限公司 LED driving device and LED light-emitting device
CN101808454B (en) * 2010-04-27 2014-09-17 海洋王照明科技股份有限公司 LED driving device and LED light-emitting device
CN102297376A (en) * 2010-06-28 2011-12-28 东芝照明技术株式会社 Led lamp system
CN102056376B (en) * 2010-11-01 2013-11-13 贵州光浦森光电有限公司 Method for increasing LED luminous efficiency
CN102056376A (en) * 2010-11-01 2011-05-11 贵阳世纪天元科技有限公司 Method for increasing LED luminous efficiency
CN102754531A (en) * 2010-12-02 2012-10-24 上舜照明（中国）有限公司 Led driving power supply circuit, driving power supply and lighting device
CN102754531B (en) * 2010-12-02 2015-01-21 上舜照明（中国）有限公司 Led driving power supply circuit, driving power supply and lighting device
WO2012071733A1 (en) * 2010-12-02 2012-06-07 深圳矽睿芯科技有限公司 Led driving power supply circuit, driving power supply and lighting device
CN103517498A (en) * 2012-06-26 2014-01-15 海洋王照明科技股份有限公司 Intelligent temperature-controlled light-modulation control circuit of LED electric torch
WO2014079134A1 (en) * 2012-11-23 2014-05-30 上海顿格电子贸易有限公司 Led constant current power supply circuit
CN103002643A (en) * 2012-11-27 2013-03-27 杭州科凡照明电器有限公司 Constant-current drive circuit used for LED (Light Emitting Diode) lamp
CN103025014A (en) * 2012-12-12 2013-04-03 宁波市镇海华泰电器厂 Light-emitting diode (LED) lamp driving power supply with functions of lightning resistance and automatic temperature control
CN103025014B (en) * 2012-12-12 2014-12-10 宁波市镇海华泰电器厂 Light-emitting diode (LED) lamp driving power supply with functions of lightning resistance and automatic temperature control
CN103957632A (en) * 2014-04-25 2014-07-30 桂林市啄木鸟医疗器械有限公司 Constant-current control circuit of light curing machine LED lamp
CN104023446A (en) * 2014-06-16 2014-09-03 朱威 Power source control device for indoor illuminating lamp
CN104023446B (en) * 2014-06-16 2016-11-30 朱威 A kind of power control of indoor illumination
CN110351931A (en) * 2019-08-09 2019-10-18 浙江阳光美加照明有限公司 A kind of LED drive circuit with small night lamp function
CN112512175A (en) * 2020-10-28 2021-03-16 海宁瑞丰灯头股份有限公司 Constant-current LED driving power supply

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Owner name: SICHUAN JIUZHOU OPTOELECTRONICS CO.,LTD

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