| 摘要 |
There is disclosed a switching circuit for transforming a source of DC voltage into a pulsating voltage of constant frequency and variable pulse duration including a load connected in series with the primary of a transformer which in turn is connected through a first controllable rectifier to a common circuit ground. The gate electrode of the first controllable rectifier is connected to a source of constant frequency pulses of variable duration. The secondary winding of the transformer is connected from the common circuit ground in series with a diode, the cathode of which is connected to the anode of a second controllable rectifier, the cathode of the second controllable rectifier being connected to the common circuit ground. The gate of the second controllable rectifier is capacitively coupled to a source of pulses which are the exact complement to the pulses applied to the gate of the first controllable rectifier. The gate of the second controllable rectifier is resistively connected to the cathode thereof. The anodes of the controllable rectifiers are further connected by the series of combination of a resistor and a capacitor. A constant frequency oscillator triggers a monostable multivibrator with a potentiometer adjustment to provide a pulse of variable duration which is connected through a driver to the gate of a first controllable rectifier. An inverting circuit and driver provide the inverted pulses to the capacitor connected to the gate of the second controllable rectifier.
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