| 摘要 |
A switch controller in a DC-DC converter performs the switching control of a primary switch and a freewheel switch which are connected to the primary and the secondary of a transformer, respectively. The switch controller comprises a control voltage generator for generating two control voltages having a predetermined voltage difference, a triangular-wave oscillator for generating a triangular-wave voltage, and a control pulse generator for generating two contro l pulse signals which cause the primary switch and the freewheel switch to alternately turn on and off such that both the primary switch and the freewheel switch are turned off during a certain period when one of the primary switch and the freewheel switch is turned off.
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