Light emitting diode (LED) constant current driver and illuminating system

A technology of constant current driver and lighting system, applied in the field of lighting, can solve the problem of narrow voltage adaptation range of LED driver, and achieve the effect of strong universal type and wide adaptation voltage range.

Inactive Publication Date: 2011-03-09
HIMIN CLEAN ENERGY HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the existing LED driver makes the LED light source always work at full power, and the voltage adaptation range of the LED driver is narrow

Method used

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  • Light emitting diode (LED) constant current driver and illuminating system
  • Light emitting diode (LED) constant current driver and illuminating system
  • Light emitting diode (LED) constant current driver and illuminating system

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Embodiment 1

[0038] see figure 1 , an embodiment of the present invention provides a LED constant current driver, including a DC power supply 101, a dimming circuit 102 and a PWM control circuit 103,

[0039] The DC power supply 101 is used to supply power to the dimming circuit 102 and the PWM control circuit 103;

[0040] The dimming circuit 102 is used to send a control signal to the PWM control circuit 103;

[0041] The PWM control circuit 103 is used to adjust the preset voltage according to the control signal to drive the LED light source to work in a constant current state.

[0042] The LED constant current driver provided by the embodiment of the present invention is provided with a PWM control circuit and a dimming circuit. When the power is turned on, the dimming circuit outputs a control signal to the PWM control circuit, and the PWM control circuit changes the set voltage according to the control signal. value, and then realize the adjustment of the power of the LED light sou...

Embodiment 2

[0044] see figure 2 , the embodiment of the present invention provides a LED constant current driver, the LED constant current driver includes a DC power supply 201, a dimming circuit 202 and a PWM control circuit 203, the DC power supply 201 is connected in series with the PWM control circuit 203, the dimming The circuit 203 is connected in parallel with the PWM control circuit 202;

[0045] Specifically, the DC power supply 201 can be a storage battery or a solar photovoltaic power supply, and the DC power supply can be DC12V or DC24V, which is not limited in this embodiment of the present invention. The DC power supply is used to supply power to the PWM control circuit and the dimming circuit .

[0046] Specifically, the PWM control circuit 203 is connected in series with the DC power supply 201, and is used to adjust the set voltage according to the control signal output by the dimming circuit, and output it to the LED light source, so as to control the junction temperatur...

Embodiment 3

[0062] Since high temperature has a serious impact on the life of the LED light source, heat will be generated when the LED light source works at the rated current state. If the junction temperature of the LED light source cannot be controlled within a safe range, the service life of the LED light source will be shortened. The embodiment of the present invention reduces the working voltage of the LED light source and the junction temperature by arranging a PWM controller and a dimming circuit in the LED constant current driver, and prolongs the service life of the LED light source.

[0063] see Figure 7 , an embodiment of the present invention provides a lighting system, the lighting system includes the LED driver 301 in any of the above embodiments, and further includes:

[0064] The LED light source 302 is connected in series with the LED driver 301 for providing a light source.

[0065]Wherein, the LED light source is a high-power LED light source, and the total power of ...

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Abstract

The invention discloses a light emitting diode (LED) constant current driver and an illuminating system, belonging to the field of illumination. The LED constant current driver comprises a direct current (DC) power supply, a dimming circuit and a pulse width modulation (PWM) control circuit, wherein the DC power supply is used for supplying power for the dimming circuit and the PWM control circuit; the dimming circuit is used for sending a control signal to the PWM control circuit; and the PWM control circuit is used for adjusting a preset voltage according to the control signal to drive an LED light source to work at a constant current state. The illuminating system comprises the LED constant current driver and the LED light source for illumination connected with the LED constant current driver in series. In the invention, the PWM control circuit and the dimming circuit are arranged in the LED driver to adjust the power of the LED light source, and the LED driver has wide adaptable voltage rang and strong universality.

Description

technical field [0001] The invention relates to the lighting field, relates to an LED constant current driver and a lighting system, in particular to a general-purpose LED constant current driver and a lighting system for solar street lamps powered by a DC power supply. Background technique [0002] LED drivers refer to devices that drive light-emitting diodes. Existing drivers can be divided into three categories from the level of power supply voltage: the first category is powered by batteries, and the voltage is generally lower than 5V. It is mainly used for portable electronic products, driving low-power and Medium-power white LEDs mainly use step-up DC / DC converters or step-up (or buck-boost) charge pump converters, and a few drivers using LDO circuits; the second type is powered by a regulated battery Or battery power supply, it mainly uses buck-boost DC / DC converter; the third category, directly powered by mains (110V or 220V) or corresponding high-voltage direct curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H02M1/12H02M1/32
CPCY02B20/42Y02B20/40
Inventor 王建宁宋振涛闫文红
Owner HIMIN CLEAN ENERGY HLDG
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