Abstract: A system for driving four-quadrant (4Q) switches of a power converter is provided herein and comprises a transformer driver module, a first gate driver module and a second gate driver module coupled to the transformer driver module via a first isolation transformer and a second isolation transformer, respectively, for receiving both switch signal information and power, and a first bidirectional switch and a second bidirectional switch coupled to the first gate driver module and the second gate driver module and to one another for driving the first bidirectional switch and the second bidirectional switch based on the switch signal information.

Abstract: A system for driving four-quadrant (4Q) switches of a power converter is provided herein and comprises a transformer driver module, a first gate driver module and a second gate driver module coupled to the transformer driver module via a first isolation transformer and a second isolation transformer, respectively, for receiving both switch signal information and power, and a first bidirectional switch and a second bidirectional switch coupled to the first gate driver module and the second gate driver module and to one another for driving the first bidirectional switch and the second bidirectional switch based on the switch signal information.

Abstract: An over-current protection circuit (3), particularly but not solely for resonant mode dc to dc converters which avoids the use of a current sensing resistor in series with the converter switching devices. A current transformer (5) is used, the secondary voltage is rectified and applied to a stable dc amplifier after careful filtering. The output (8) of the dc amplifier controls the frequency of a voltage controlled oscillator (4) which determines the switching frequency of the converter switching devices and thus the current flowing through them.