Dimming control is often needed to control the illumination level of LED light for the human need to create a comfortable environment. Moreover, since dimming operations result in reduced power consumption and produce less heat, they increase the LED lifespan and optimize the running cost. Therefore, dimming control is essential in LED lighting applications. The illumination of LED is directly related to average current. In this proposed work a double pulse width modulation (DPWM) dimming control technique is adopted to control the illumination level of LED light, as illustrated in figure. 8. With DPWM control when the low-frequency pulse signal (vgL) is high, the converter operates with high-frequency pulse. Consequently, when vgL is low, the converter is shut down for a long duration.  In fig. \ref{385709}, Tm and δm are the switching period and duty cycle of the low frequency dimming signal, respectively. By varying δm from 20% to 100%, ZVS operation is achieved and illumination of LED light is adjusted by controlling the average output current.
3         SIMULATION RESULTS AND ANALYSIS