Non-polar capacitor voltage reducing and dividing rectification linear light-emitting diode (LED) driving circuit

Abstract

The invention relates to a non-polar capacitor voltage reducing and dividing rectification linear light-emitting diode (LED) driving circuit. A capacitor is adopted to reduce voltage first and then divide the voltage, input alternating current voltage and output power change linearly by utilizing capacitive reactance, the ripple of the direct current voltage output by a voltage dividing rectification circuit is small, and the capacity of a filtering capacitor is small. A non-polar capacitor voltage reducing and dividing rectification linear LED driving circuit has the advantages of being simple in structure, low in cost, small in size, high in power factor and efficiency and long in service life. The LED driving circuit is simplified, a driving requirement of the LED is met, a non-polar capacitor is utilized to replace an electrolytic capacitor, capacitor loss is reduced, and the service life of the driving power supply is prolonged. A dimming variable resistor is provided to achieve brightness adjustment of an LED group, the shortcomings of low power factor and efficiency and no dimming of a capacitance-resistance pressure reducing type LED driving power supply are overcome, the driving power supply is especially suitable for driving LED lamps with the power ranging from 3 to 20 watts and is an improved product of the existing capacitance-resistance LED lamp driving power supply.

Description

technical field [0001] The present invention relates to a converter in the field of electrotechnical technology, specifically a linear LED drive circuit that utilizes non-polar capacitors to reduce voltage and divide voltage rectification, and particularly relates to the use of power electronic technology to control capacitors to perform voltage reduction and division rectification linear output on alternating current. LED drive circuit. Background technique [0002] Compared with traditional incandescent lamps, fluorescent lamps and commercially available energy-saving lamps, LED lighting has obvious advantages in luminous efficiency, energy saving, environmental protection, and service life. Therefore, it is known as the most promising green lighting in the 21st century. light source. Based on the consideration of efficiency and volume, most of the existing LED lighting lamps use constant current switching power supply and RC voltage drop as the driving circuit. The swit...

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Problems solved by technology

Although the patent application (201310495516.3) uses capacitive voltage divider rectification, the volt-ampere characteristics of LEDs cause the input AC voltage and output power to show exponential changes. When the input AC voltage changes, the output power of LED lighting changes greatly, which seriously affects the LED lighting. The stability of the lighting; and the use of electrolytic capacitors, resulting in complex circuits and short service life

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