Control type soft-switching technology for inverter

Abstract

The invention discloses a control type soft-switching technology for an inverter, and belongs to the field of power electronic converters. The control type soft-switching technology for the inverter is suitable for the traditional full-bridge inverter topology with low power and the traditional half-bridge inverter topology with low power. According to the soft-switching technology, a zero voltage switch environment of a switch device is built by controlling the positive direction, the negative direction and the reverse direction of the output inductive current in one cycle. For the three modulation modes of the inductive current, a digital-analog hybrid control circuit and method which are simple and easy to implement are provided. The control type soft-switching technology for the inverter has the advantages of being high in efficiency, small in size of a passive element, low in cost and the like and is especially suitable for small-power application occasions.

Description

technical field [0001] The invention relates to the field of power electronic converters, in particular to the soft switching technology of inverters, and especially belongs to the technical field of low-power inverters. Background technique [0002] In order to pursue higher power density and better dynamic characteristics, the operating frequency of converters continues to increase. However, increasing the switching frequency will not only increase the switching loss but also may bring more serious EMC noise. To better solve these problems, soft switching technology must be adopted. Scholars at home and abroad have proposed a variety of soft-switching technologies for inverters, which can be roughly divided into passive soft-switching technologies and active soft-switching technologies. Passive soft switching technology only uses passive devices to realize zero-voltage or zero-current switching of switching devices, which is more dependent on load conditions, such as ZVS...

AI Technical Summary

Problems solved by technology

Passive soft switching technology only uses passive devices to realize zero-voltage or zero-current switching of switching devices, which is more dependent on load conditions, such as ZVS or ZCS cannot be achieved at light loads

Active soft switching technology can achieve soft switching conditions in the full load range, but usually based on some specific topologies, additional auxiliary resonant units, devices and complex control strategies are required to achieve, resulting in an increase in the size and cost of the entire inverter , complex control and reduced reliability

These soft-switching techniques are not suitable for low-power, low-cost applications such as micro-inverters due to system cost and volume constraints

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