New magnetic bias suppression method for full bridge inverters

To overcome the magnetic bias and low reliability of conventional the full bridge inverter,a magnetic bias real- time detection and suppression method is proposed. The method combines advantages of the analog detection and digital control, in which the transformer primary current and the output current are acquired simultaneously to participate the dynamic control process. The detection system can output the moment and strength of the magnetic bias signal in real time,by which the digital controller can adjust PWM driving pulses and ensure that the system can quickly and effectively suppress magnetic bias. Experimental results show that the proposed method has good consistency,versatility,stability and high reliability,which can be widely used in the system composed of full bridge inverters.