Blocking time maintenance circuit for zvs converters

Details Blocking time maintenance circuit for zvs converters Blocking time maintenance circuit for zvs converters

H - Electricity

02

M

H02M 3/335 (2006.01) H02M 3/337 (2006.01)

Patent

CA 2276656

Discloses a blocking time maintenance circuit that is applied to a resonant-transition zero voltage switching (ZVS) power converter having saturable core reactors to induce a current in the primary of the transformer which enables ZVS. The circuit includes a peak detector for producing a signal having a magnitude proportional to an input voltage. A biasing mechanism, comprising a current source, is provided in order to reset the saturable core reactors in a controlled manner. A control mechanism is connected to the peak detector and the current source in order to generate a reset current, the magnitude of which is correlated to the input voltage. In this manner, the volt-time product of the saturable reactors is varied, thereby maintaining the blocking time relatively constant over a wide range of input voltages and ensuring that the output voltage does not fall out of regulation.

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