Switch-mode power supply for bridged linear amplifier
AssigneeCrown International, Inc.
InventorGerald R. Stanley
Life of this patent
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Abstract
A power converter which includes a bridged power amplifier powered from a sole or single DC input power source through a plurality of parallel connected PWM buck converters. The converters are modulated with reference signals which operate in time alternation such that in any conversion cycle there exists a plurality of modulating wave forms which are identical except for their time delays and which are evenly spaced in time over a single conversion cycle. A feedback control amplifier compares the voltage output of the parallel connected converters through the magnitude of the amplifier's required supply voltage and drives the modulating components of the circuit to control the switching duty cycle of each of the individual PWM converters.
Claims14
An amplifier power supply circuit comprising a power amplifier having a power input, a plurality of pulse width modulated switch-mode power converter means connected in parallel and adapted for connection to a DC power supply, each converter means for tracking the power demand for said amplifier, all said converter means collectively for outputting current from said power supply to said amplifier power input, each converter means including an operating frequency which is phase locked to a sampled data input having a data rate, a pulse width modulated controller means for sensing the power input demands of said amplifier and in response thereto producing a pulse width modulated switch drive signal for each said converter means, said controller means including a free-running oscillator and phase lock circuitry including a resonate circuit stimulated by a data rate clock pulse for synchronizing said oscillator in producing each said pulse width modulated switch drive signal.
An amplifier power supply circuit comprising a power amplifier having a power input, a plurality of pulse width modulated switch-mode power converter means connected in parallel and adapted for connection to a DC power supply, each converter means for tracking the power demand for said amplifier, generator means for producing a plurality of identical modulating voltage wave forms except for equal time delays, means for converting said wave forms into a plurality of pulse width drive signals to sequentially switch said converter means, all said converter means collectively for outputting current from said power supply to said amplifier power input when each converter means is switched on.
Dependencies are inferred from the claim text.