Mixed mode compensation circuit
AssigneeRichtek Technology Corporation
InventorsChien-Fu Tang, Jiun-Hung Pan, Isaac Y. Chen
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Abstract
A mixed mode compensation circuit for a power converter generate a digital signal according to a reference signal and a feedback signal which is related to the output voltage of the power converter, convert the digital signal into a first analog signal, offset the first analog signal with a variable offset value to generate a second analog signal, and filter out high-frequency components of the second analog signal to generate a third analog signal for stable output voltage of the power converter. The mixed mode compensation does not require large capacitors, and thus the circuit can be integrated into an integrated circuit.
Claims56
A mixed mode compensation circuit for a power converter, comprising:
- a digital signal generator for generating a first pole, the digital signal generator generating a digital signal according to a reference signal and a feedback signal which is related to an output voltage of the power converter;
- and
- a digital-to-analog converter coupled to the digital signal generator, for converting the digital signal into a first analog signal.
A mixed mode compensation circuit for a power converter, comprising:
- a digital signal generator for generating a first digital signal and a second digital signal according to a reference signal and an output voltage feedback signal which is related to an output voltage of the power converter;
- a digital offset injector coupled to the digital signal generator, for generating a variable offset according to the second digital signal;
- an adder for adding the first digital signal and the variable offset or for adding the first digital signal and a signal related to the variable offset;
- and
- a digital-to-analog converter coupled to the adder, for converting an output of the adder or a signal related to the output of the adder into an analog signal.
A mixed mode compensation circuit for a power converter, comprising:
- a digital signal generator for generating a first digital signal and a second digital signal according to a reference signal and an output voltage feedback signal which is related to an output voltage of the power converter;
- a digital offset injector coupled to the digital signal generator, for generating a variable offset according to the second digital signal;
- a first digital-to-analog converter coupled to the digital signal generator, for converting the first digital signal into a first analog signal;
- a second digital-to-analog converter coupled to the digital signal generator, for converting the second digital signal into a second analog signal;
- and
- an adder for adding the first analog signal and the second analog signal or adding a signal related to the first analog signal and the second analog signal.
A mixed mode compensation circuit for a power converter, comprising:
- a digital signal generator for generating a first digital signal according to a reference signal and an output voltage feedback signal which is related to an output voltage of the power converter;
- a digital filter coupled to the digital signal generator, for filtering the first digital signal;
- and
- a digital-to-analog converter coupled to the digital filter, for converting an output of the digital filter into an analog signal.
Dependencies are inferred from the claim text.