Method and device for controlling resonance transition with no-load operation low-power loss

Abstract

The method thereof comprises: based on the frequency response and load condition of resonant tank in the resonance switching device, the aim of stably outputting voltage is reached by adjusting switching frequency and controlling the switching duty cycle so as to reach a higher switchover efficiency; in addition, combining the synchronous rectification to reach a highest switchover efficiency at heavy current load condition. The apparatus comprises: a resonance switch, a controller of resonance switch, and a controller of voltage stabilization mode; according to the requirement of system specification, a power factor corrector and a voltage multiplying rectifier can be used in the front stage of the resonance switch unit; the output rectifier of the resonance switch unit can be replaced with a synchronous rectifier circuit.

Description

technical field [0001] The invention relates to a conversion control method and device with no-load operation and low standby power loss, especially a conversion control method and device that can achieve high conversion efficiency, good load voltage regulation rate and low standby power consumption under any load conditions Conversion control method and device. Background technique [0002] Due to the exhaustion of available energy sources, the development of various energy sources and the restriction of energy use are the current global consensus. Therefore, advanced countries such as Europe, America and Japan have formulated appropriate energy policies for energy use. The standard for the power consumption value of electrical products in standby mode (Green Power) is generally set at 0.5 watts to 1 watt, which is to prevent electrical products from still running when they are not powered on. Consume too much power. Relevant electronic product manufacturers have develop...

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Problems solved by technology

But using the burst mode (Burst mode) will produce a large audible noise, and at the same time, the load regulation rate will be poor in this mode, and the transient response will be poor, and the switching frequency in the burst mode (Burst mode) Operating at very high frequency, the main switch of the resonant converter is not easy to design and operate at zero voltage switching, and the resulting switching loss is still not small. Generally speaking, this method is only suitable for converters below 200W

[0009] The converters of the above two methods are generally suitable for low-power single-output power converters. Under the condition of high-power output, their design will be more difficult and their shortcomings will be more serious.

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