Active clamping, boosting and isolating series miniature converter control method and device

Abstract

The invention discloses an active clamping, boosting and isolating series miniature converter control method and a device. The device comprises an acquisition circuit used to acquire an input direct voltage and current signal and an output direct voltage signal, a controller used to track the maximum power of the input direct voltage and current signal and form a switching drive signal, a drive circuit used to control on-off of a main switch and an auxiliary switch of an active clamping and boosting circuit according to the switching drive signal, the active clamping and boosting circuit used to actively clamp and boost the high side of the input direct voltage signal, and an isolation circuit used to isolate the direct voltage signal after high-side active clamping and boosting and output a boosted high-frequency direct voltage. By adopting the active clamping, boosting and isolating series miniature converter control method and the device of the invention, on the premise of ensuring the safety performance of voltage conversion, the number of the switches is reduced, the stress of the switches is lowered, the size of the device is reduced, and the cost is lowered.

Description

technical field [0001] The invention relates to the technical field of voltage conversion, in particular to an active clamp boost isolation series micro converter control method and device. Background technique [0002] With the development of power electronics technology and digital control technology, there are three types of micro voltage converters commonly used at present: [0003] Such as figure 1 as shown, figure 1 It is a schematic diagram of a conventional boost converter in the prior art. The inductor L in the boost converter f Acting as an energy storage element, when the switch is turned on, the power supply to the inductor L f charging, the inductance L f energy storage, and when the switch is turned off, the power supply and the inductor L f Charge the capacitor together and release the energy to the load to achieve the purpose of increasing the voltage and realize the maximum power tracking of the system. [0004] Such as figure 2 as shown, figure 2...

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Problems solved by technology

[0006] The above-mentioned traditional boost converter has the advantages of few components, low cost, simple structure and relatively easy control, but there is no electrical isolation between the input terminal and the output terminal, and the safety performance is poor; while the above-mentioned flyback converter and forward Although the flyback converter can realize the electrical isolation between the input terminal and the output terminal, the flyback converter is only suitable for small power occasions, and there are certain limitations in practice, and the interleaved parallel flyback converter can also control the For converters exceeding 600W, there are many switching devices and the control is relatively complicated. Forward converters are suitable for larger power applications, but their control algorithms are complex, and the primary side of the transformer is not easy to achieve magnetic reset. If precise control is to be achieved, it is necessary to More switching devices are required, and the switching stress is large, the volume is large, and the manufacturing cost is high

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