Efficient inverter

Abstract

The invention provides an efficient inverter and belongs to the technical field of inverters. The efficient inverter solves the problem that an existing inverter is complex in circuit and large in direct-current electromagnetic interference. The efficient inverter comprises a direct-current power supply Vdc, an alternating-current power supply Vac, six switch tubes S1, S2, S3, S4, S5 and S6, two diodes D1 and D2, two filter inductors L1 and L2 and a microcontroller MCU. Control ends of the switch tubes S1, S2, S3 and S4 are connected with a high-frequency pulse signal output end of the microcontroller respectively through modulation circuits. The switch tubes S5 and S6 are connected with a power frequency pulse signal output end of the microcontroller MCU respectively. The efficient inverter has the advantages of being simple in circuit, high in efficiency and small in direct current electromagnetic interference.

Description

technical field [0001] The invention belongs to the technical field of inverters and relates to a high-efficiency inverter. Background technique [0002] The inverter is a power conversion device, which mainly realizes the energy conversion from DC to AC. Grid-connected inverters include photovoltaic grid-connected inverters, wind energy grid-connected inverters, fuel cell grid-connected inverters, etc. The grid-connected inverter can efficiently convert the energy generated by renewable energy into alternating current with the same frequency and phase as the mains, which can be connected to the mains. [0003] The inverter can be divided into half-bridge inverter power supply and full-bridge inverter power supply according to its circuit form. Among them, there are two control modes of the full-bridge inverter power supply: unipolar SPWM modulation and bipolar SPWM modulation. But there are some problems in these two control methods: [0004] 1. Bipolar SPWM modulation:...

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Problems solved by technology

[0004] 1. Bipolar SPWM modulation: The two switching tubes of the same bridge arm are complementary driven. Due to the inconsistency of the switch on and off characteristics and the inconsistency of the control circuit parameters of the dead time, it may cause the two switching tubes of the same bridge arm. The switch tubes are turned on at the same time, which leads to damage to the switch tubes and causes the inverter to fail to work normally;

[0005] 2. Unipolar SPWM control: In the negative half cycle of the mains, there is only one switching tube for high-frequency switching, which leads to a decrease in the utilization rate of the output inductance, thereby reducing the efficiency of the inverter power supply; at the same time, this control method will cause electromagnetic waves at the DC end. The problem of interference is quite prominent

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