Boosting three-bridge-arm inverter and boosting adjustment method

Abstract

The invention discloses a boosting three-bridge-arm inverter and a boosting adjustment method. A power pipe in a 380-V system usually resists to the voltage of 800 V or above generally, a lower pipe of a full bridge inversion circuit is often high in heat emitting amount, and the content of harmonic waves in a power grid is also very high. The boosting three-bridge-arm inverter comprises a power supply equipment module (101) which is connected with a push-pull boosting module (102), the push-pull boosting module is connected with a rectifying filter module (103) which is connected with a three-bridge-arm inversion bridge module (104), and the three-bridge-arm inversion bridge module is connected with an LCL filter module (105); and the power supply equipment module, the push-pull boostingmodule and the LCL filter module output signals to the A / D conversion end of a DSP main controller (108), and a PWM output port of the DSP main controller is connected with an isolation driving moduleA (107) and an isolation driving module B (111). The boosting adjustment method is applied to the boosting three-bridge-arm inverter.

Description

Technical field: [0001] The invention relates to a step-up three-bridge arm inverter and a step-up regulating method. Background technique: [0002] The inverter is a device that converts direct current into alternating current. It is often used in active filters, reactive power compensators, and high-voltage frequency conversion devices. Generally, the withstand voltage of the power tube is relatively high, usually in a 380V system. The withstand voltage is generally above 800V, and the lower tube of the long-term used full-bridge inverter circuit also has the function of current continuous flow, often the heat generated by the lower tube is serious, and when the system is connected to the power grid, the full-bridge inverter circuit and The grid exchanges energy, which increases the content of harmonics in the grid. [0003] Therefore, how to provide an inverter circuit topology, reduce the cost of the circuit, improve the conversion efficiency and reduce the withstand vo...

AI Technical Summary

Problems solved by technology

[0004] attached figure 2 The displayed content is the commonly used full-bridge inverter topology. In a 380V system, the withstand voltage of the power tube is generally above 800V, and the lower tube of the long-used full-bridge inverter circuit also has the function of current continuous flow, often The heat generation of the down tube is serious, and in the figure 1 When the converter 102 is non-isolated, leakage current will be generated when the power supply load 101 is a solar panel, and a discharge circuit will be generated when the electric equipment is shared with the ground

Images