method and schaltungsanordnung to increase the maximum possible efficiency, the maximum possible frequency and the maximum possible ausnutzungsgrades performance components in resonanzwandler - switched mode power supplies with nulldurchgangsdetektor.

摘要

For controlling the drive signals of the switching transistors in a resonant converter switched-mode power supply with regulation depending on zero-crossing detection, in which a prematurely responding zero-crossing detector is provided, a method is specified which enables a switching-on and switching-off at the zero crossing of the primary current or the primary voltage independently of an input voltage which changes within the permissible range, of a load changing within the permissible range and of the transit time of the control loop, by virtue of the fact that a comparison of the duration of time between the generation of a drive signal and the switching of the power transistor with the time interval of the premature response of the zero-crossing detector from the actual zero crossing for obtaining a control signal for controlling the rate-action threshold of this zero-crossing detector is provided. Circuit arrangements for carrying out the method are specified. …IMAGE…