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Holdup time extension in switch mode power supply

vinod mishra
Prodigy 10 points
Other Parts Discussed in Thread: UC3843

Dear Sir,
        In one of our application using flyback DC to DC convert there is requirement to have holdup time greater the 50msec at minimum input voltage. The specification of the used supply in the application is as below:-
        Input:- 19.2V to 72V DC
        Output:- +12V & -12V (Total 9W)
        PWM:- 100kHz using UC3843
 
        Using 2 X 330uF capacitance at the input we are only getting less then 10msec holdup time at minimum input (19.2V DC) at rated output power. This need to be increased to more than  50msec. Simply increasing input capacitance doesn’t seems to be a solution.
        Kindly suggest if some kind of high voltage energy storage techniques can be used at input, which will be activated once input voltage fails. If possible how to implement such method ?