Special switching power supply for high current pulse LED (Light Emitting Diode)

A high-current pulse, switching power supply technology, applied in the direction of electric light source, electric lamp circuit layout, light source, etc., can solve the problems of accelerated light decay and low efficiency, and achieve the effect of improving LED luminous efficiency and high transient intensity

Inactive Publication Date: 2012-05-30
管时衡
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the driving of high-brightness LEDs is a problem that needs to be solved. In the existing constant voltage or constant current LED power supply mo

Method used

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  • Special switching power supply for high current pulse LED (Light Emitting Diode)
  • Special switching power supply for high current pulse LED (Light Emitting Diode)

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Embodiment Construction

[0010] A special switching power supply for high-current pulse LEDs of the present invention will be further described below in conjunction with the accompanying drawings.

[0011] see figure 1 , a high-current pulse LED special switching power supply of the present invention, including AC-DC converter 1, PFC function circuit 2, constant current / constant voltage circuit 9 and PWM control circuit 3 connected in series, constant current / constant voltage The output terminal of the circuit 9 is connected in series with an LED, and also includes a field effect tube 4, a photodiode 5 and a thermocouple 6. The field effect tube 5 is connected in series with the output terminal of the constant current / constant voltage circuit 9, and the field effect tube 5 Connected to the PWM control circuit 3 through a line, the photosensitive diode 5 and the thermocouple 6 can feed back the brightness and temperature signal of the LED lamp, and the signal is transmitted to the PWM control circuit 3...

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Abstract

The invention provides a special switching power supply for a high current pulse LED (Light Emitting Diode). The special switching power supply for the high current pulse LED comprises an AC-DC (Alternating Current-Direct Current) converter, a PFC (Power Factor Correction) functional circuit, a constant current/constant voltage circuit and a PWM control circuit, wherein an LED is connected to an output end of the constant current/constant voltage circuit in series; the special switching power supply for the high current pulse LED also comprises a field-effect transistor, a photodiode and a thermoelectric couple, wherein the field-effect transistor is connected to the output end of the constant current/constant voltage circuit in series and connected with a PWM (Pulse Width Modulation) control circuit via a wire; a brightness and temperature signal of the LED light can be reflected by the photodiode and the thermoelectric couple and transmitted to the PWM control circuit. According to the invention, higher transient intensity of the LED is obtained through an alternate on-off mode of setting pulse width to adjust PWM reference current or voltage to be a plurality of times larger than a conventional working value; the power-on time within unit time is reduced without reducing the average luminous flux of the LED so as to reduce the heating of the LED chip without power; and the luminous efficiency of the LED in the power supply driving direction is increased.

Description

technical field [0001] The invention relates to the technical field of LED luminous efficiency, in particular to a high-current pulse LED dedicated switching power supply. Background technique [0002] Light-emitting diode (LED) was invented in the 1960s. LED has the advantages of small size, long life, low power consumption, fast response, good shock resistance, etc., and is widely used in signal indication, digital display and other fields. With the continuous improvement of luminescent materials, the development of high-brightness LEDs has been successful, especially the successful development of white-light high-brightness LEDs, making it widely used in indoor and outdoor decoration, even urban street lighting and civil lighting. However, the driving of high-brightness LEDs is a problem that needs to be solved. In the existing constant voltage or constant current LED power supply mode, 90% of the electric power is converted into heat energy, which not only has low effici...

Claims

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Application Information

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IPC IPC(8): H05B37/02
CPCY02B20/42Y02B20/40
Inventor 管时衡刘金发刘金明
Owner 管时衡
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