Back to results
US 10,483,857 B1Granted
Flyback converter with output voltage calibration
AssigneeDialog Semiconductor GmbH
InventorsJianming Yao, Kai-Wen Chin, David Nguyen, Tao Li
Life of this patent
Estimating the term…
Abstract
An output voltage calibration circuit and technique is disclosed to increase the accuracy and precision of the constant-voltage mode for a flyback converter.
Claims15
A circuit for a flyback converter, comprising:
- an output switch for isolating an output node for the flyback converter from a power lead in a data cable;
- an output voltage calibration circuit confirmed to directly sense an output voltage for the flyback converter while the output switch is closed to provide a digital version of the output voltage and configured to adjust a reference voltage command responsive to a comparison of the digital version of the output voltage to a desired level for the output voltage;
- an error amplifier configured to form an error signal responsive to a difference between a digitized feedback voltage and the reference voltage command;
- and
- a power switch controller configured to modulate a cycling of a power switch transistor responsive to the error signal.
2 more elements
A method of calibrating a flyback converter operating in a constant-voltage mode of operation, comprising:
- sensing an output voltage for the flyback converter to form a sensed output voltage while the flyback converter is isolated from external loads and is driving a own internal load;
- comparing the sensed output voltage to a desired level for the output voltage to form a calibration error;
- adjusting a reference voltage command responsive to the calibration error to form an adjusted reference voltage command;
- transmitting the adjusted reference voltage command from a second win in side of the flyback converter to a primary winding side of the flyback converter;
- comparing the adjusted reference voltage command to a digitized feedback voltage to form a digital error signal;
- and
- modulating a cycling of a power switch in the flyback converter responsive to the digital error signal.
4 more elements
Dependencies are inferred from the claim text.