CN202206597U

CN202206597U - LED (Light Emitting Diode) drive power with temperature adjusting function

Info

Publication number: CN202206597U
Application number: CN2011202761920U
Authority: CN
Inventors: 蔡轶群
Original assignee: Shenzhen Alpha Electronic Tech Co ltd
Current assignee: Shenzhen Alpha Electronic Tech Co ltd
Priority date: 2011-08-01
Filing date: 2011-08-01
Publication date: 2012-04-25
Anticipated expiration: 2021-08-01

Abstract

The utility model provides an LED (Light Emitting Diode) drive power with temperature adjusting function, which comprises a rectifying and filtering unit, an output unit with an energy storage unit and a filtering unit, a constant current unit with a switch unit and a constant current control unit, and a heat detection unit, wherein the heat detection unit detects working temperature of an LED illumination device and feeds the working temperature back to the constant current control unit connected with the heat detection unit; and the constant current control unit controls on-state or off-state of the switch unit according to the feedback signal. When the working temperature of the LED illumination device is too high, the constant current control unit can turn off the switch unit according to the feedback of the heat detection unit to cut off alternating current power and an energy storage unit is used to supply power to the LED illumination device, so that the current passing through LED light source and other some power circuits is reduced, thereby reducing heat production quantity of the LED illumination device to avoid high temperature working state of the LED illumination device so as to ensure the working efficiency and the service life of the LED illumination device.

Description

LED driving power with temp regulating function

Technical field

The utility model relates to the LED field, relates in particular to a kind of LED driving power with temp regulating function.

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, and is 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 receives voltage fluctuation greatly, but LED lighting device (particularly wherein led light source) can produce great amount of heat in the process of work; But can't be like 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 the utility model is to provide a kind of LED driving power with temp regulating function, and it detects the working temperature of LED lighting device, in view of the above drive current is regulated.

The purpose of the utility model realizes through following technical scheme.

A kind of LED driving power with temp regulating function; Include the constant current unit that output unit and that a rectification filtering unit, includes energy-storage units and filter unit includes switch element and constant current control unit; Wherein, Said rectification filtering unit is connected with AC power, is used for alternating current is changed into direct current; Said energy-storage units and led light source connect into the loop; Said 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; Said switch element is connected in output unit; Said 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; Said constant current control unit also be connected with one be used to detect the working temperature of LED lighting device hot detecting unit, and control the conducting or the shutoff of said switch element according to the feedback signal of said hot detecting unit.

Preferably, said constant current unit is connected in the output of said rectification filtering unit and obtains working power.

Preferably, be connected with a voltage regulation unit between said constant current unit and the said rectification filter unit.

Preferably, said hot detecting unit is a thermistor.

The utility model compared with prior art; Its advantage is that the constant current control unit of the utility model 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 supply power, the electric current of feasible flow through led light source and other partial circuits of power supply reduces, thereby reduces 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

Fig. 1 is the functional-block diagram of existing LED driving power;

Fig. 2 is the theory diagram of the utility model LED driving power.

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.

Consult shown in Figure 2ly, this LED driving power mainly is made up 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 converting the alternating current of being imported to direct current output 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, by the working morphology of 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, 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 to energy-storage units 120 charging.

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, through 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, cuts off AC power 20 and changes by energy-storage units 120 power supplies, makes the flow through electric current of led light source 30 and other partial circuits of power supply reduce; 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, and it plays pressure stabilization function to the electric current by rectification filtering unit 10 outputs, and is that constant current unit 14 provides stable working power.

Wherein, hot detecting unit 16 is that a thermistor constitutes.

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

1. LED driving power with temp regulating function; Include the constant current unit that output unit and that a rectification filtering unit, includes energy-storage units and filter unit includes switch element and constant current control unit; Wherein, said rectification filtering unit is connected with AC power; Said energy-storage units and led light source connect into the loop; Said filter unit is connected between rectification filtering unit, energy-storage units and the led light source; Said switch element is connected in output unit; Said 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; It is characterized in that: said constant current control unit also be connected with one be used to detect the working temperature of LED lighting device hot detecting unit.

2. the LED driving power with temp regulating function as claimed in claim 1 is characterized in that said constant current unit is connected in the output of said rectification filtering unit.

3. the LED driving power with temp regulating function as claimed in claim 2 is characterized in that, is connected with a voltage regulation unit between said constant current unit and the said rectification filter unit.

4. the LED driving power with temp regulating function as claimed in claim 3 is characterized in that said hot detecting unit is a thermistor.