Patent ID: 8724356
Filing Date: 2014-05-13
Classification: H02M

Abstract:
1. A two-stage isolated DC/AC conversion circuit structure, comprising: a DC power supply; a waveform generation circuit connected in parallel with the DC power supply, having an inductor and a main switch, the main switch controlled by a controller, showing conduction and cut-off, utilizing a cycle of conduction and cut-off to control a charge and discharge time of the DC power supply to the inductor, the result being to gradually increase and reduce the charge and discharge time, allowing for gradually increasing and reducing potentials, and the potentials converting the DC wave from the DC power supply into a rarefaction wave power with positive half wave; an energy storage circuit connected in parallel with the waveform generation circuit, having a capacitor with low capacity and a diode for preventing inversion, the capacitor able to be converted into the rarefaction wave power for energy storage and filtering out high-frequency waves of the rarefaction wave and remaining positive half wave power with low-frequency; a first switch circuit connected in parallel with the energy storage circuit, having a first transformer and a first switch, the first switch connected with a primary side of the first transformer; a second switch circuit connected in parallel with the first switch circuit, having a second transformer and a second switch, the second switch connected with a primary side of the second transformer; a first isolation circuit having a first diode for preventing output inversion, connected with a secondary side of the first transformer and connected in parallel with an end user; a second isolation circuit having a second diode for preventing output inversion, connected with a secondary side of the second transformer and connected in parallel with the end user: allowing the first, second switches and the main switch to be controlled by the controller and another controller and showing operating mode