US 7,923,979 B2Granted

Control system for dynamically adjusting output voltage of voltage converter

AssigneeNational Tsing Hua University

InventorsPo Chiun Huang, Chun Yen Tseng

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Abstract

A control system for dynamically adjusting an output voltage of a voltage converter includes a signal calculation circuit, a pulse width modulator, a voltage converter, a nonlinear calibration circuit and a signal converter. The signal calculation circuit, the pulse width modulator, the voltage converter and the signal converter form a long-tail loop. The signal calculation circuit simultaneously receives a target value and a detection value from the signal converter to generate an error value for adjusting the output of the pulse width modulator. The voltage converter and the nonlinear calibration circuit form a local pulse-squashing loop. Pulse widths of an input signal to the voltage converter can be timely and effectively calibrated and controlled, thereby decreasing power consumption of the voltage converter and providing an effective protective mechanism.

Claims19

Dependent claims

A control system for dyramically adjusting an output voltage of a voltage converter, the control system comprising:

a first control loop having a signal processing circuit for synthesizing a pulse width modulation signal inputted to the voltage converter, said signal processing signal comprising:
a voltage converter;
a signal calculation circuit having a mapper performing a least significant portion truncation and an updating control duty ratio with M-bit resolution and a dither predictor for N-bit predicted interpolation;
and
a pulse width modulator receiving an output signal of said signal calculation circuit to generate the pulse width modulation signal for controlling the voltage converter, wherein said dither predictor generates a signal with an effective resolution of (M+N)-bit to said pulse width modulator;
and
a second control loop timely calibrating and squashing a pulse width of the pulse width modulation signal generated by said first control loop by detecting characteristics of the voltage converter.

4 more elements

Dependencies are inferred from the claim text.