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Bridgeless LED driving power supply

A LED drive and power supply technology, applied in the field of bridgeless LED drive power supply, can solve the problems of increased power loss, harmonic pollution, output current distortion of rectifier bridge, etc., and achieve the goal of improving efficiency, reducing cost, and reducing the number of circuit components Effect

Inactive Publication Date: 2016-07-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current flow path contains two diodes, which increases power loss, and the output current of the rectifier bridge will be distorted, resulting in harmonic pollution. It is necessary to add a PFC circuit to improve the input power factor, and the added PFC circuit will further increase power loss.

Method used

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  • Bridgeless LED driving power supply
  • Bridgeless LED driving power supply
  • Bridgeless LED driving power supply

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Embodiment Construction

[0015] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] A bridgeless LED driver such as figure 2 As shown, it is characterized in that: including 220V AC power supply, EMI filter, Dual-Zeta circuit, LED load, output current sampling circuit, output voltage sampling circuit, PWM switch controller; wherein: the input end of the EMI filter is connected to 220V AC Connected to the power supply, the output of the EMI filter is connected to the input of the Dual-Zeta circuit, the output of the Dual-Zeta circuit is connected to the LED load, the input of the PWM switch controller is connected to the current sampling circuit and the output voltage sampling circuit of the LED load, and the PWM The output terminal of the switch controller is connected with the gates of the MOS transistors Q1 and Q2.

[0017] Su...

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Abstract

The invention discloses a bridgeless LED driving power supply comprising a 220V alternating-current power supply, an EMI filter, a dual-zeta circuit, an LED load, an output current sampling circuit, an output voltage sampling circuit, and a PWM switch controller. The input end of the dual-zeta circuit is connected with the output end AB of the EMI filter, and the output end of the dual-zeta circuit is connected with the LED load. The input end of the PWM switch controller is connected with the output current sampling circuit and the output voltage sampling circuit of the LED load, and the output end of the PWM switch controller is connected with the gates of MOS tubes Q1 and Q2. According to the bridgeless LED driving power supply, the dual-zeta circuit is adopted, so that the alternating-current power supply can directly supply power to the LED load without via a rectifier bridge, and the brightness of the LED load can be adjusted through an analog dimming approach.

Description

technical field [0001] The invention belongs to the field of LED driving power supply, in particular to a bridgeless LED driving power supply. Background technique [0002] LED lamps have gradually replaced incandescent lamps, sodium lamps, and fluorescent lamps as the fourth-generation green light source due to their advantages such as long life, low power consumption, and easy dimming. The brightness of the LED lamp is proportional to the magnitude of the current flowing through it. It is a typical current device, and its ideal power supply mode is constant current power supply. Most non-isolated LED drive power supplies on the market use a linear constant current LED drive circuit. The peripheral circuit is simple and the control method is simple, but there is a pulsating current twice the power frequency. For example, the mains frequency is 50Hz, and the current flowing through the LED Contains 100Hz AC components, which will cause the LED to flicker. Studies in recent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 沈艳霞蔡成超
Owner JIANGNAN UNIV