Radio transmitter energy recovery system
An am transmitter includes an rf signal generator and a switching-type rf signal amplifier. The rf amplifier output depends upon the energizing voltage applied thereacross, so it acts as a modulator. The energizing voltage is produced by a high -power audio amplifier which includes a pulse-width modulator driving a high-power audio switch. The switch terminals are coupled in series with an audio-frequency filter, energizing terminals of the rf amplifier and a source of direct energizing potential, for varying the voltage across the rf amplifier at an audio rate in response to the duty cycle of the width-modulated pulses for audio modulating the rf carrier. In order to reduce modulation distortion at low duty cycles resulting from the finite turn-on and turn-off time of the audio switch, an offset voltage generator is coupled to the filter by a diode. Energy stored in inductive components of the filter cause a voltage pulse during each turn-off of the audio switch. The voltage pulse is coupled to the offset voltage generator by the diode, and the voltage at the filter is maintained at the offset voltage while current flows in the offset voltage generator and the inductors lose energy. The offset generator includes a capacitor for storing energy resulting from the current flow in the inductor. A dc to ac inverter is coupled to the capacitor and generates alternating voltage. The ac is rectified and a pulsating direct current is coupled to the energizing source for recovering the energy in the inductive pulse.
- Assignee:
- RCA Corp
- Patent Number(s):
- US 4319359
- OSTI ID:
- 5157008
- Resource Relation:
- Patent Priority Date: Priority date 10 Apr 1980, United Kingdom of Great Britain and Northern Ireland (UK); Other Information: PAT-APPL-147575
- Country of Publication:
- United States
- Language:
- English
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