| 摘要 |
The resonant circuit is connected to an a.c. source consisting of a push-pull amplifier (41, 42) controlled by an oscillator stage of constant frequency. Between the oscillator stage and the pushpull amplifier there is an adjustable resistor (R1) whose control energy for the low-resistance state after a starting operation is taken from a circuit of the push-pull amplifier. When there is a drop in current, the amplifier also undergoes a reduction in current. To generate the control energy in the resonant circuit supply circuit, a current transformer can be introduced, to which a rectifier circuit is connected on the secondary side. |
