Forward-flyback isolated type boost inverter realized by coupling inductors and application thereof

Abstract

The invention discloses a forward-flyback isolated type boost inverter realized by coupling inductors and application thereof, comprising two power switch tubes, two auxiliary switch tubes, four anti-parallel diodes, a switch tube parallel capacitor, two clamp capacitors, two switch capacitors, two output diodes and two coupling inductors respectively provided with two windings. The invention realizes zero-voltage switching on of the power switch tubes through the resonance of the leakage inductance of the two coupling inductors and the switch tube parallel capacitor, absorbs the voltage peak switched off by the switch tubes caused by the leakage inductance and realizes energy lossless transfer by utilizing a clamp circuit comprising the anti-parallel diodes of the switch tubes and the two clamp capacitors, realizes the high gain output of the inverter by utilizing the serial connection of the second windings of the two coupling inductors, further improves the gain of the inverter and lowers the output voltage stress of the diodes by utilizing the switch capacitors and realizes the output zero-current switching off of the diodes by utilizing the leakage inductance of the coupling inductors.

Description

technical field [0001] The invention relates to a DC-DC converter and its application, in particular to a forward and flyback isolated active clamp interleaved parallel boost converter and its application. Background technique [0002] In recent years, energy shortage and environmental pollution have become the focus of the world, and the development and application of renewable energy have attracted widespread attention from all over the world. In the renewable energy power generation system, the electric energy generated by many renewable energy sources is low-voltage direct current, and high-voltage direct current is required for power transmission to the grid, so a DC-DC converter is required to convert low-voltage direct current into suitable and At the same time, due to the consideration of personal safety, many applications have requirements for electrical isolation. Therefore, isolated converters with low input ripple, high gain, and high efficiency play an importan...

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Problems solved by technology

[0008] 3. In this scheme, the forward transformer only transfers energy to the secondary side when its corresponding switch tube is turned on, while the flyback transformer only transfers energy to the secondary side when its corresponding switch tube is turned off, resulting in low utilization of the transformer , which increases the volume of the transformer and reduces the system power density;

[0009]4. Due to the asymmetry of the forward transformer and the flyback transformer, it is difficult to realize the interleaved parallel operation of the circuit, which affects the improvement of the system power level

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