Abstract:

An UPS inverter system is designed in this Paper. The double half bridge structure is used in the main circuit. Inverter output voltage waveform is the sixteen step-waves, The combination of the PWM control with the sequence pulse control is used in the control circuit which can perform the transistors functions of transistors. By using CAD technique, the power transistors are thought of as the ideal switches and used for analyzing characteristics of the magnetic coupling device, By analyzing the effect states and the circuit parameters，the basis is provided for the circuit design.

Key words: UPS inverter, power transistor, Design