{"id":2002,"date":"2024-07-19T14:09:17","date_gmt":"2024-07-19T08:39:17","guid":{"rendered":"https:\/\/study.madeeasy.in\/?p=2002"},"modified":"2025-07-16T15:15:14","modified_gmt":"2025-07-16T09:45:14","slug":"zcs-and-zvs-resonant","status":"publish","type":"post","link":"https:\/\/www.madeeasy.in\/study\/ee\/power-electronic\/zcs-and-zvs-resonant","title":{"rendered":"Comparisons between ZCS and ZVS Resonant Converters"},"content":{"rendered":"

ZCS and ZVS Resonant Converters<\/h2>\n

ZCS can eliminate the switching losses at turn-off and reduce the switching losses at turn-on. Because a relatively large capacitor is connected across the diode Dm<\/sub>, the inverter operation becomes insensitive to the diode\u2019s junction capacitance. When power MOSFETs are used for ZCS, the energy stored in the device\u2019s capacitance is dissipated during turn-on. This capacitive turn-on loss is proportional to the switching frequency. During turn-on, a high rate of change of voltage may appear in the gate drive circuit due to the coupling through the Miller capacitor, thus increasing switching loss and noise. Another limitation is that the switches are under high-current stress, resulting in higher conduction loss. It should, however, be noted that ZCS is particularly effective in reducing switching loss for power devices (such as IGBTs) with large tail current in the turn-off process.<\/p>\n

By the nature of the resonant tank and ZCS, the peak switch current is much higher than that in a square wave. In addition, a high voltage becomes established across the switch in the off-state after the resonant oscillation. When the switch is turned on again, the energy stored in the output capacitor becomes discharged through the switch, causing a significant power loss at high frequencies and high voltages. This switching loss can be reduced by using AVS.
\nZVS eliminates the capacitive turn-on loss. It is suitable for high-frequency operation. Without any voltage clamping, the switches may be subjected to excessive voltage stress, which is proportional to the load. For both ZCS and ZVS, the output voltage control can be achieved by varying the frequency. ZCS operates with a constant on-time control, whereas ZVS operates with a constant off-time control.<\/p>\n

Static Kramer Drive<\/h3>\n

\"Static<\/p>\n