CN203057649U - Low light decay control circuit for integrated large power COB illumination assembly - Google Patents

Abstract

A low light decay control circuit for an integrated large power COB illumination assembly is disclosed, the low light decay control circuit for an integrated large power COB illumination assembly comprises an AC alternating current input unit, a lightening proof unit, an input EMI filtering unit, an AC/DC rectification unit, and a surge-proof unit, wherein the AC alternating current input unit, the lightening proof unit, the input EMI filtering unit, the AC/DC rectification unit, and the surge-proof unit are connected; a DC/DC voltage boosting unit, a high frequency converter unit, a PWM pulse modulation unit, and a PFC power factor correction unit are connected; and the high frequency converter unit, an output rectification filtering unit, a secondary constant current module unit, a COB light source module group unit, a heat sensor module unit, a feedback network unit, an photoelectrical coupling unit, and the PWM pulse modulation unit are connected. The low light decay control circuit for an integrated large power COB illumination assembly is characterized by high efficiency, high PF value, high reliability, high intelligence and the like.

Description

A kind of integrated high-power COB light fixture hangs down the light decay control circuit

Technical field

The utility model relates to a kind of lighting technical field, specifically the low light decay control circuit of a kind of integrated high-power COB light fixture.

Background technology

The light decay of LED more and more is familiar with by people, and the current subject matter that faces of LED is with regard to life problems.From the normal use of LED, the topmost factor that influences the LED light decay is exactly heat.The source of heat, the Joule heat that the normal resistance of material produces when energising, the Joule heat of the dead resistance generation that brings in the technology in addition also has light to be absorbed the heat that the back produces.The accumulation of heat makes temperature raise, and temperature raises and makes performance degradation, material aging, the sex change of chip.The heat dissipating state of LED is bad, makes the temperature of LED chip too high, produces light decay, even burns out.Scattering and disappearing of heat will have enough big heat exchange surface area, adds copper billet on the PCB that gives LED that has or the aluminium base, is to increase cost and weight without rhyme or reason in fact, and can not solves the problem of heat.Because after its thermal capacitance ability, temperature just begins to raise at thermal accumlation.Thermal capacitance by material solves heat problem, can only be the heat problem that solves short time work.In the prior art, the heat radiation of integrated high-power COB light fixture is relatively poor, and light decay is fast.

The utility model content

Technical problem to be solved: the utility model purpose provides a kind of good heat dissipation effect, the integrated high-power COB light fixture control circuit of low light decay.

Technical scheme: a kind of integrated high-power COB light fixture hangs down the light decay control circuit, comprise that AC exchanges input, anti-lightning strike unit, input EMI filter unit, AC/DC rectification unit, prevents that the surge unit links to each other, DC/DC boosting unit, high-frequency converter unit, pwm pulse modulating unit, PFC power factor correction unit link to each other, high-frequency converter unit, output rectification filtering unit, secondary constant-current modular unit, COB light source module group unit, heat sensor modular unit, feedback network unit, photoelectricity coupling unit, pwm pulse modulating unit link to each other.

The utility model beneficial effect: the utility model design has high efficiency, high PF value, characteristics such as high reliability, high intelligence, temperature detection part adopts digital temperature sensor (DS1820) detection chip self-temperature simultaneously, be equivalent to indirect detection PCB temperature, far-end triode temperature can be detected again, just the aluminium base temperature can be detected if triode and LED together be welded on the aluminium base.DS1820 changes contrast with the ADC of detected two kinds of temperature by chip internal and amplifies and deliver to secondary constant-current, and then regulates the variation that the impedance of constant current electronic semi-conductor realizes output current.The utility model is reasonable in design, has guaranteed that COB light source module is operated in the limit, place of safety, has improved useful life and the heat-sinking capability of light source module so greatly.

Description of drawings

Fig. 1 the utility model block diagram.

Fig. 2 heat sensor modular unit schematic diagram.

Embodiment

See Fig. 1,2, comprise that AC exchanges input, anti-lightning strike unit, input EMI filter unit, AC/DC rectification unit, prevents that the surge unit links to each other, DC/DC boosting unit, high-frequency converter unit, pwm pulse modulating unit, PFC power factor correction unit link to each other, high-frequency converter unit, output rectification filtering unit, secondary constant-current modular unit, COB light source module group unit, heat sensor modular unit, feedback network unit, photoelectricity coupling unit, pwm pulse modulating unit link to each other.

Label 1 represents aluminium base among Fig. 2, and label 2 represents the COB module.

Overvoltage protection did not damage the subsequent conditioning circuit element when civil power guaranteed that through anti-lightning strike unit controller is struck by lightning by AC interchange input; the EMI filter unit can be eliminated di/dt and the dv/dt that produces from power semiconductor in switching process; to cause the harmonious wave interference of powerful Conducted Electromagnetic Interference; and strong-electromagnetic field (normally near field) radiation; the AC/DC rectifier power source converts alternating current to direct current; anti-surge unit can guarantee to be unlikely to over-voltage and over-current and damage in controller frequent starting process; the DC/DC boosting unit is elevated to 400V with the direct voltage that obtains; high-frequency converter converts level and smooth high direct voltage to needed operating voltage; the PFC power factor correction unit can bring up to 0.95 ~ 0.99 to net side power factor; the harmonic pollution to electrical network had both been administered in input current THD＜10%.; improved the whole efficiency of power supply again; the pwm pulse modulating unit; signal according to the feedback network unit is constantly adjusted duty ratio; realize constant pressure and flow; the output rectification filtering unit can be eliminated output voltage electric current Wen Bo, and the signal that the secondary constant-current unit comes by continuous detection load thermoinduction modular unit feedback feeds back to the PWM controller by the photoelectricity coupling unit.The thermoinduction module is mainly gathered the operating state of illuminating module constantly, the signal of gathering is delivered to secondary control unit realizes the adjusting of operating current and then reduce light decay.

Claims (1)

1. an integrated high-power COB light fixture hangs down the light decay control circuit, it is characterized in that: comprise that AC exchanges input, anti-lightning strike unit, input EMI filter unit, AC/DC rectification unit, prevents that the surge unit links to each other, DC/DC boosting unit, high-frequency converter unit, pwm pulse modulating unit, PFC power factor correction unit link to each other, high-frequency converter unit, output rectification filtering unit, secondary constant-current modular unit, COB light source module group unit, heat sensor modular unit, feedback network unit, photoelectricity coupling unit, pwm pulse modulating unit link to each other.

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