A split-phase inverter circuit with switchable output mode

Abstract

The invention discloses a split-phase inverter circuit with a switchable output mode, comprising an inductor La, an inductor Lb, an inductor Lc, a relay S1 and a switch tube Q1-Q8, the switch tube Q1 and Q2 are connected in series, and the switch tube Q3 and Q4 In series, the switching tubes Q5 and Q6 are connected in parallel after being connected in series, one end of the inductor La is connected between the switching tubes Q1 and Q2, one end of the inductor Lc is connected between the switching tubes Q5 and Q6, and the inductor Lb One end of the relay S1 is connected to the switch tube Q3 and Q4. When the relay S1 is closed, the split-phase inverter circuit outputs a split-phase 120 / 240V. When the relay S1 is disconnected, the split-phase inverter circuit Output single-phase 240V. Compared with the existing split-phase inverter circuit, when outputting single-phase 240V, it can save 2 switching tubes. At the same time, the inverter inductance Lb has no excitation and degaussing process, which reduces the loss of the magnetic core. In grid-connected applications, the user benefits are greater .

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to a split-phase inverter circuit with switchable output modes. Background technique [0002] At present, there are various power grid systems such as TN_S, TN_C, TN_C_S, TT, and IT in the world. The power grid systems in different regions are quite different. Compared with the United States and China, the domestic power supply system in the United States is introduced as 120 / 240V single-phase three-wire. This 240V is actually composed of 120V single-phase with a phase difference of 180°, while China’s is 220V single-phase system. [0003] In the field of energy storage applications, when the inverter is running off-grid, it can directly output 120 / 240V split-phase power, which can meet the needs of household loads with two voltages. The energy can be provided by the grid, and the inverter can output single-phase 240V. Such as figure 1 Shown is the existing split-phase output ...

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Problems solved by technology

like figure 1 Shown is the existing split-phase output inverter circuit, which can realize the split-phase output of 120V and 240V power supply, which can meet the basic function of outputting two voltages at the same time off-grid, and can be applied to a system similar to the American split-phase grid structure, but In grid-connected applications, the inverter has three bridge arms working together. The switching tube and inductance have large losses and low efficiency. In the field of photovoltaic power generation or energy storage applications, it seriously affects the user's investment benefits

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