ZETA photovoltaic inverter

Abstract

The invention discloses A ZETA photovoltaic inverter, which comprises a main circuit and a control circuit, wherein the main circuit comprises an inductor L1, an inductor L2 and a capacitor C1, the inductor L1 and the inductor L2 are electrically connected with the capacitor C1 respectively, the control circuit comprises an H-bridge control circuit and a hysteresis comparator, the main circuit is electrically connected with the control circuit, the control circuit further comprises a sampling circuit, a precision rectifying circuit and a driving circuit, the H bridge is controlled by PWM and comprises two pairs of switching tubes Q1 and Q4 and Q2 and Q3, Q1 is connected with Q4, and Q2 is connected with Q3. According to the ZETA inverter, the ZETA circuit and the H bridge are combined to achieve the current inversion function, meanwhile, a hysteresis current control method is adopted, compared with a traditional bridge type inversion structure, the control precision is improved, the reliability of the whole system is improved on the basis that it is guaranteed that the number of the whole switch elements is small, and the requirement on the performance of a switch element is reduced while the control speed is ensured, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of power electronic converters, in particular to a ZETA photovoltaic inverter. Background technique [0002] Electric energy has been widely used, but in places where the power grid is not covered or difficult to cover, such as desert islands, plateaus, deserts and other areas, there are still situations where energy storage devices such as diesel generators or batteries are prepared to be used as emergency solutions. , In these devices, it is necessary to integrate inverters to convert DC power into AC power for use by equipment. [0003] At present, the existing inverter structures are mainly based on half-bridge and full-bridge topologies, and the control technology is relatively mature. The requirements for the DC section are not high, and the performance requirements for the devices are not high. Among them, the half-bridge inverter circuit has fewer switching devices. , but the output voltage amplitud...

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Problems solved by technology

[0003] At present, the existing inverter structure is mainly based on half-bridge and full-bridge topologies, and the control technology is relatively mature. The requirements for the DC section are not high, and the performance requirements for the devices are not high. Among them, the half-bridge inverter circuit has fewer switching devices. , but the output voltage amplitude is only half of the input, and there must be an additional boost circuit in the front stage, which requires high withstand voltage capability of the components; the switching components of the full-bridge inverter circuit are twice that of the half-bridge, but the switching components are used More, limiting the overall efficiency

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