Inverter power source device

Abstract

The invention discloses an inverter power source device used for converting a direct current output by a direct-current power source into an alternating current. The inverter power source device comprises a preceding-stage current feed circuit and a posterior-stage inverter circuit. The current feed circuit comprises a full-bridge converter, an isolation transformer and a rectifying circuit, wherein the full-bridge converter, the isolation transformer and the rectifying circuit are connected in series in sequence. The posterior-stage inverter circuit comprises a tank circuit and a bipolar full-bridge high-frequency inverter circuit, wherein the tank circuit is connected between two output ends of the current feed circuit, and the bipolar full-bridge high-frequency inverter circuit is used for converting direct voltage output by the current feed circuit into alternating voltage. Due to the inverter power source device, under the condition that energy conversion efficiency is ensured, complexity of control can be reduced, and reactive power adjusting and power expansion are convenient.

Description

Technical field [0001] The invention relates to the technical field of voltage conversion, in particular to an inverter power supply device. Background technique [0002] At present, in the field of photovoltaic power generation, integrated grid-connected power generation is still the mainstay. The grid-connected photovoltaic power generation system converts the DC power of the solar panels into alternating current with the same frequency and phase as the grid voltage through the grid-connected inverter and transmits it to the grid. Therefore, the grid-connected inverter is the core equipment of the photovoltaic grid-connected power generation system. Its reliability, efficiency and safety will affect the entire power generation system and directly affect the power generation capacity and stable operation of the power station. [0003] Photovoltaic grid-connected micro-inverters (micro-inverters for short) are connected to a single photovoltaic module, which can directly convert t...

AI Technical Summary

Problems solved by technology

[0005] Depend on figure 2 It can be seen that the output of the flyback circuit in the front stage of the traditional micro-inverter is not a constant DC, and reactive power regulation cannot be realized.

In addition, in the micro-inverter with this structure, the transformer T is not only used for energy storage, but also for energy transmission, so an air gap needs to be opened, so the front-stage flyback circuit cannot increase the power, even if Great power, low efficiency

Moreover, in order to achieve soft switching, it is not only necessary to select a higher-performance controller, but also to design more complex, sometimes it is necessary to add some auxiliary circuits

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