Contents
How much voltage does the ZVS oscillator need?
This whole capacitor was added in parallel to the primary coil of the flyback transformer. The ZVS oscillator needs a low voltage power supply to power it. It needs about 40 volts at 10 amps to work at full capacity.
How does the ZVS high voltage power supply work?
It first uses a streetlight transformer to step down the 110 volt mains current to 40 volts. This is then rectified and filtered to achieve a clean DC voltage that is fed to the ZVS oscillator board.
What is the operational frequency of the ZVS driver?
Without an arc (transformer secondary left open), the operational frequency is approximately 38.3 kHZ. At this lower frequency, the 103 uH reactance is approximately 11.1 Ohms. The inductance of the primary of the ZVS driver is 22.8 uH with a reactance of 12.9 Ohms at 77 kHz.
When does a ZVS phase reversal take place?
This phase reversal happens when the primary voltage crosses zero so that switching occurs when there is zero voltage across the FET. Hence, “Zero Voltage Switching” or ZVS. In some cases, the FETs are run without zeners to ground and the gate voltage is limited by a voltage regulator such as a 7812.
How does a ZVS flyback transformer work?
This induces a current into the thousands of windings in the secondary coil of the transformer. Because there is a high ratio of secondary windings to primary windings, the voltage on the output of the flyback transformer is extremely high. The ZVS oscillator is the most complex part of this circuit, so I am going to explain how it works.
How does a zero volt ZV circuit work?
They will not produce very much heat, because this circuit is switching at zero volts (ZeroVoltageSwitching), but add a heat sync just in case. I added my heat sync by drilling holes in the aluminium and using screws to mount the Mosfets to the aluminium.