| 摘要 |
The transformer of a blocking oscillator converter is magnetized in a flux phase during which a switch on its primary side is switched on. In a blocking phase, in which the switch is switched off, the transformer is demagnetized by giving off energy to a load connected on the secondary side. In order to ensure for the switch to be switched on only after the transformer is fully demagnetized, a transfomer voltage is formed and the switch is only allowed to switch on when the voltage of values with a polarity has returned to finite values with the opposite polarity. The threshold value begins at zero or a value of the first polarity after the switching power supply is put into operation and then shifts to values of a second polarity if the shift does not begin before the time at which the voltage at the load rises.
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