Switch-mode power supplies with delay-independent timing within the control loop

摘要

The flyback converter is configured as follows. And the primary is connected in series with the winding (4) and a switching transistor (2) converter 6 that has, in response to a control signal (U _C), the primary interval (T _P) while closing the switching element (2), second interval (T _S), while the switching element (2) a control means to open (14) and the feedback signal secondary winding 12 for generating a (IFB), the feedback signal measurement means for one-way ranging in a (U _FB) ( 20) and a comparator (generating a first timing signal (TM _1), the control signal (U _C) in response to the comparison and the logic unit 16 for deriving an indicating a second range from 16) and the feedback signal (U _FB) and it includes the integrating means (28) for. The comparator means compares the second period (T _S) with a feedback signal (I _FB) with a reference signal (I _R) measured by the one-way during.; Switch-mode power supply is a primary interval (T _P) starting moment in the (t _4), and at least the second section a second timing signal having an end time that is not the end time prior to (T _S) (TM ₂₎ and the selection comparison means includes first timing signal a first time, the selection device 26 (TM ₁₎ respond by passing the reference signal (I _R) to, - a, and, and further comprising a means (32) for generating, time 2 in response to a timing signal (TM _2), a second time for transferring the feedback signal (I _FB) measuring in a single direction - and a selection device (30). As a result, the output of the flyback converter is not affected by the error caused by the delay in the generation of the first timing signal (TM1).