Patent ID: 9190920
Filing Date: 2015-11-17
Classification: H02M,Y02E

Abstract:
1. An H-bridge micro inverter grid-connected device, comprising: a PIC single-chip microcomputer controller processing and calculating collected signals; a CPLD controller outputting pulse signals, wherein the pulse signals include two groups of SPWM waves and one group of PWM waves; an MOSFET H full-bridge circuit inverting DC signals outputted by photovoltaic panels to high-frequency AC signals; a high-frequency transformer boosting the voltage of the high-frequency AC signals inverted by the MOSFET H full-bridge circuit to the voltage which conforms to a grid-connected amplitude; a half-bridge rectifying circuit converting output signals of the high-frequency transformer to half sine wave signals; an SCR H full-bridge circuit converting the half sine wave signals outputted by the half-bridge rectifying circuit to sine wave signals which conform to grid requirements; and a filter circuit filtering harmonic waves in the sine waves outputted by the SCR H full-bridge circuit and converting the output sine waves to sine waves which conform to grid requirements; wherein the SPWM waves control the MOSFET H full bridge to generate the high-frequency AC signals, and the PWM waves control the SCR H full-bridge to convert the half sine wave signals outputted by the half-bridge rectifying circuit to the sine wave signals.