| 摘要 |
<p>A bidirectional oscillatory current is established in a parallel L.C. resonant circuit (L1, C1) from a unidirectional source (Vi). The bidirectional current can be established by means of a single current switch TR1 which is operated cyclically. An energy storage and extraction device in the form of an inductor (TF) is connected in a feed path to the resonant circuit (L1, C1) and limits the rate of rise of current in the resonant circuit when the transistor TR1 is switched on. A transformer (TR) couples energy to an output circuit (D1, C2) by forward conversion when the transistor TR1 is switched on. When the transistor TR1 switches off, energy stored in (TF) flows as a current on a separate extraction path and is fed back to the circuit to enhance the efficiency thereof. The inductor (TF) conveniently comprises a flyback transformer which applies flyback energy to the input or output of the circuit. The output circuit (D1, C2) acts as a voltage clamp when the transformer (TR) is forward converting, with the effect of clamping the voltage on (C1) to a reflected value of the voltage on (C2).</p> |
