High-voltage and large-power PWM light modulation LED driving power supply without electrolytic capacitor

A technology of LED driving and electrolytic capacitors, applied in the field of lighting, can solve the problems of restricting the service life of LED lighting systems, limiting the service life of LED driving power, etc., to achieve the effect of improving the service life and improving reliability.

Active Publication Date: 2016-02-24
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the service life of the electrolytic capacitor limits the life of the LED drive power supply, which further restricts the service life of the entire LED lighting system

Method used

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  • High-voltage and large-power PWM light modulation LED driving power supply without electrolytic capacitor

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] see figure 1 As shown, the electrolytic capacitor-free high-voltage high-power PWM dimming LED drive power supply of the present invention includes a rectification circuit 1, and the rectification circuit 1 is connected to the input terminal of the power supply. The LED driving power also includes a current-type multi-level DC-DC circuit and a control circuit 4 . The rectification circuit 1 is connected with the current-mode multi-level DC-DC circuit. The current-type multi-level DC-DC circuit is connected with the LED light source 5 . The current-type multi-level DC-DC circuit is connected with the control circuit 4 .

[0014] The current-mode multi-level DC-DC circuit is a current-mode five-level DC-DC circuit 2 . The current-type five-level DC-DC circuit 2 includes a first diode D1, a second diode D2, a third diode D3, a fourth di...

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Abstract

The invention discloses a high-voltage and large-power PWM light modulation LED driving power supply without an electrolytic capacitor. The LED driving power supply comprises a rectification circuit (1). The rectification circuit (1) is connected to the input end of the power supply. The LED driving power supply also comprises a current type multi-level DC-DC circuit and a control circuit. The rectification circuit (1) is connected to the current type multi-level DC-DC circuit. The current type multi-level DC-DC circuit is connected to an LED light source (5), and is also connected to the control circuit (4). An electrolytic capacitor is not needed by the LED driving power supply, so the service life of the driving power supply is prolonged and the reliability of a whole LED illumination system is improved.

Description

technical field [0001] The invention relates to the technical field of lighting, more specifically to a high-voltage high-power PWM dimming LED drive power supply without an electrolytic capacitor. Background technique [0002] At present, most of the LED driving power supply is AC power supply, so circuit conversion is required, that is, converting the AC power into the required DC power, and generating a controllable DC constant current source to drive the LED to work. In the conversion circuit, an energy storage element is needed to maintain the power balance between input and output. Usually, the first choice for this energy storage element is an electrolytic capacitor. [0003] The lifespan of conventional electrolytic capacitors is only about 10,000 hours when the ambient temperature is 50°C, and its lifespan will be doubled for every 10°C increase in operating temperature. However, the life of the LED itself can usually reach 100,000 hours, and the life of the electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 鲍建宇鲍卫兵张伟剑
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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