| 摘要 |
A clamped-mode resonant converter converts direct current to alternating current. The power supply also includes a control circuit for adjustably setting and controlling the amplitude of vibration of the transducer, and providing during start-up a ramp start. - The supply, further, includes a control circuit for limiting the maximum permissible current flow to the transducer and the reverse current flow from the transducer resulting from stored mechanical energy. Both control circuits provide feedback signals which control the pulse width modulated operation of the clamped-mode resonant converter and thus control the voltage amplitude of the alternating current output from the converter. A phase locked loop circuit causes the frequency of the alternating current output from the converter to track the parallel resonant frequency of the transducer. |
