| 摘要 |
A switch-mode power amplifier circuit using high power, low distortion waveforms is connected to an electromagnetic load to provide a high degree of control over the load. The circuit comprising a plurality of half-bridge networks having outputs combined at a summation point. The half-bridge networks are switched to provide power outputs sequenced to generate an interlaced output at the summation point which is operably connected to the load so that for a given switching frequency of the networks the operational frequency of the circuit is increased. The sequencing of the half-bridge outputs to generate an interlaced output facilitates the reduction of the switching frequency of individual switching components within the half-bridges while at least maintaining the overall operational frequency of the circuit. For N half-bridges operating at fkHz, the overall operational frequency of the circuit is NfkHz. Alternatively, the switching frequency of individual switching elements of a system operating at fokHz may be reduced by a factor of N. A feedback signal generated across the load is included at the summation point and is optionally augmented to decrease distortion.
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