Quantance, Inc.

David C G Tournatory

Martin Tomasz

A highly efficient, high control bandwidth and high-speed power supply with a linear driver and a switching regulator for regulating an output based on a control signal. The linear driver has a first input for receiving the control signal and a second input connected to the output for receiving negative feedback. The driver's output is controlled by its two inputs and has a capacitor connected in series with it to generate a capacitor voltage Vresponsive to the DC and low frequency components in the driver's output. The switching regulator has a control input and a regulator output connected in a regulator feedback loop. The control input receives capacitor voltage Vand the regulator feedback loop minimizes capacitor voltage V. Thus, switching regulator takes over the generation of DC and low frequency components, while the linear driver provides high frequency output current components.

Dynamic power supply employing a linear driver and a switching regulator

High bandwidth, low noise switching power supply operating in quasi-resonant mode for filtering switching harmonic noise, while providing a fast control bandwidth and power at high efficiency. The power supply has an LCL tank defining a resonance period T, and a switching circuit regulation loop for turning on its switching circuit for on-time tcommencing at a time based on a state of regulation of the power supply. A switching capacitor current sensor triggers the switching circuit to turn off at the end of the resonance period T, whereupon the switching and output inductors enter a discharging phase for a period not related to resonance period T. 'Quasi-resonant' operation, where the power supply is in resonant mode during on time tand not in resonant mode during off time tensures that the output inductor filters the switching harmonic noise of the switching circuit.

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San Francisco, CA, United States of America

David C G Tournatory