Method for reducing losses and distortion in a driver with a capacitive load
AssigneePresident and Fellows of Harvard College
InventorSimon Chaput
Life of this patent
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Abstract
A method for reducing switching losses and waveform distortion in a driver for a circuit with a capacitive load includes generating a variable pre-drive pulse to achieve zero voltage and zero-current switching of a high-side switch of the unfolding stage. A controller computes the variable pre-drive pulse with the controller, and a sense resistor in series with the power converter inductor detects a zero voltage switching condition point and/or a zero voltage switching condition point. The driver includes a power converter that receives an input voltage vin as input and generates a clean folded waveform as an output. An unfolding stage referenced to vin receives the clean folded waveform from the converter and unfolds the folded waveform into a full waveform.
Claims9
A method for reducing switching losses and waveform distortion in a driver for a circuit with a capacitive load, comprising a power converter to receive an input voltage vin as input and generate a clean folded waveform as an output, an unfolding stage referenced to vin, to receive the clean folded waveform from the converter and unfold the folded waveform into a full waveform, and a controller to control the driver, wherein the converter operates bi-directionally, the method comprising the steps of:
- generating a variable pre-drive pulse to achieve zero voltage and zero-current switching of a high-side switch (Q2) located between an inductive device and an output of a two-switch converter under all operating conditions;
- computing the variable pre-drive pulse with the controller;
- and
- detecting a zero voltage switching condition point and/or a zero current switching condition point through a current sensor,
- wherein the current sensor is a sense resistor in series with the power converter inductor.
A method for reducing waveform distortion for a controller circuit with a capacitive load, comprising the steps of;
- receiving an input parameter of the controller circuit;
- identifying a reference voltage (Vref) of the controller circuit;
- and
- adapting a proportional gain (Kp) of the controller circuit according to a converter transfer function (H(z)),
- wherein the controller is based on a proportional-integral (PI) controller wherein the proportional and integral parameters are adjusted dynamically.
Dependencies are inferred from the claim text.