PWN controller use with open loop flyback type DC to AC converte

Details PWN controller use with open loop flyback type DC to AC converte PWN controller use with open loop flyback type DC to AC converte

1998-02-11

1998-10-27

Berhane, Adolf

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 21, 363 41, H02M 3335

Patent

active

058285580

ABSTRACT:
A controller and ring generator circuit realized therefrom utilizing an open loop flyback topology to achieve a desired output voltage waveform. A characteristic feature of the controller is that it provides the required signals to control a ring generator circuit having an open loop fly back topology. The controller functions to generate a PWM signal that is used to switch the primary of a transformer on and off. The controller includes the necessary functionality to control the duty cycle of the generated PWM signal so as to produce a sine wave output on the secondary of the transformer. The controller also includes overcurrent protection circuitry that tracks the load current by sensing the current through the primary winding. In addition, the circuit permits negative current in the secondary by use of a synchronous rectifier circuit coupled to an additional secondary transformer winding. An output bridge circuit creates a full sine wave from the generated half wave output.

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