STABILISED QUASI-RESONENT CONVERTER Russian patent published in 2011 - IPC H02M7/53846 

FIELD: electricity.

SUBSTANCE: controlled current does not flow through modulating MIS-transistors. Reduction of weight and dimensions is achieved due to exclusion of the second secondary winding of the power transformer, and application area expands due to provision of the possibility to carry out work with pulse loads. The stabilised quasi-resonant converter comprises two serially connected recuperating diodes, joined so that the cathode of the first recuperating diode is connected to the positive terminal of the supply source, and the anode of the second recuperating diode is connected to its negative terminal. The first output of the resonant throttle is connected to the input of the primary winding of the power transformer. Serially connected charging MIS-transistors are connected so that drain of the MIS-transistor is connected to the positive terminal of the supply source, and source of the MIS-transistor - to its negative terminal. The point of connection of charging MIS-transistors is connected to the point of recuperating diodes connection, and also to the first output of the resonant capacitor, the second output of which is connected to the second output of the resonant throttle. Two serially connected capacitors are connected in parallel with a charging MIS-transistor. Their common point is connected to the output of the primary winding of the power transformer. The secondary winding of the power transformer is connected to the input of the first rectifier, the output of which is connected to load resistor shunted with the filter capacitor and voltage divider. Outputs "A" and "B" of the first push-pull PWM-controller via the first and second control transformers accordingly are connected to gates of the first and second charging MIS-transistors. The output "SYN" of the second push-pull PWM-controller is connected to the output "SYN" of the first push-pull PWM-controller. The first outputs of time-setting resistor and capacitor are connected to "R" and "C" outputs of the second push-pull PWM-controller, and their second outputs are connected to "minus" of the filter capacitor. Outputs "A" and "B" of the second push-pull PWM-controller are accordingly connected to the inputs of the first and second inverters, outputs of which via control transformers are connected to gates of modulating MIS-transistors. The primary winding of the power transformer is connected to the input of the second rectifier, the output of which is connected to drain-source circuit parallel to the connected first and second modulating MIS-transistors. To create a negative voltage feedback, the output of the voltage divider is connected to "IN" output of the second push-pull PWM-controller.

EFFECT: increased efficiency factor of the converter, reduction of its weight and dimensions and expansion of application area of the proposed quasi-resonant converter.

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