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What is ZCS and ZVS?
ZVS eliminates the capacitive turn-on loss. ZCS operates with constant on-time control, while ZVS operates with constant off-time control. With a wide input and load range, both techniques have to operate with a wide switching frequency range, making it not easy to design resonant converters optimally.
What is a zero switch?
Zero speed switches (ZSS) also known as Speed Actuating Sensing Switches are used to detect whether a rotating shaft is turning (even at very slow speeds) in various machines, conveyors, power plants, and in industries involving the production of cement, sugar, textiles, paper, etc.
What is a ZVS driver?
The ZVS Driver circuit is a Royer-type push-pull oscillator with a resonated primary that is implemented with FETs. This type of oscillator can be used to drive the ferrite core of a flyback transformer to generate high voltage. It can also drive a high-current air-core “work” coil for an induction heater.
What is the meaning of zero voltage switching?
Terms Zero Voltage Switching and Zero Current Switching are very unfortunate and misleading. More appropriate terms would be Zero Voltage Turn-on and Zero Current Turnoff. The idea is pretty obvious: for the switch itself it is advantageous to be turned on a tad before there will be current through it, and turned off when current is already ceased.
What happens when the ZVS switch is off?
During the ZVS switch off-time, the L-C tank circuit resonates. This traverses the volt – age across the switch from zero to its peak, and back down again to zero. At this point the switch can be reactivated, and lossless zero voltage switching facilitated.
When to use zero voltage in phase control?
Zero Voltage Switching (ZVS) means that the power to the load (heater or cooler or other device) is switched on or off only when the output voltage is zero volts. A major disadvantage of phase control as a means of controlling load power is the RFI generated when the thyristors are triggered into the on state.
When do you switch MOSFET to zero voltage?
(The technique can also be used to switch the MOSFET when current, rather than voltage, reaches zero. This is known as Zero Current Switching (ZCS).) An additional advantage is that the smooth switching waveforms minimize EMI (Figure 4).