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US 11,309,801 B2Granted
Flyback converter with improved dynamic load response
AssigneeDialog Semiconductor GmbH
InventorsPengju Kong, Tao Li, Juyoung Yoon
Life of this patent
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Abstract
A secondary-side control loop for a flyback converter is provided that generates a secondary-side control signal during normal operation using a compensator. In periods of significant load changes, the compensator is bypassed so that the secondary-side control signal is generated as an open-loop signal.
Claims18
A secondary-side controller for a flyback converter with secondary-side regulation, comprising:
- an error amplifier configured to generate an error signal responsive to a difference between an output voltage and a reference voltage;
- a compensator configured to compensate the error signal to produce a closed-loop control signal;
- an output state monitor configured to determine whether a threshold load change has occurred for the flyback converter, wherein the secondary-side controller is configured to drive an optocoupler with the closed-loop control signal in response to an absence of the threshold load change and to drive the optocoupler with an open-loop control signal in response to the threshold load change;
- and
- a multiplexer configured to select between the open-loop control signal and the closed-loop control signal to provide a selected control signal for driving the optocoupler.
2 more elements
A method of secondary-side regulation of a flyback converter, comprising:
- during periods in which a load change for the flyback converter is less than a threshold load change:
- comparing an output voltage to a reference voltage to generate an error signal and processing the error signal in a compensator to produce a closed-loop control signal in a secondary-side controller and transmitting the closed-loop control signal to a primary-side controller;
- and
- during periods in which the load change for the flyback converter is greater than the threshold load change:
- generating an open-loop control signal that does not involve a use of the compensator in the secondary-side controller and transmitting the open-loop control signal to the primary-side controller.
2 more elements
A flyback converter with secondary-side regulation, comprising:
- a secondary-side controller configured to generate an open-loop control signal during an open-loop period in response to a load change for the flyback converter being greater than a threshold level and configured to generate a closed-loop control signal after an expiration of the open-loop period, the secondary-side controller including a multiplexer configured to select between the open-loop control signal and the closed-loop control signal to provide a selected control signal;
- an optoisolator configured to transmit the selected control signal;
- and
- a primary-side controller configured to control a cycling of a power switch transistor in response to a receipt of the selected control signal from the optoisolator.
1 more element
Dependencies are inferred from the claim text.