Back to results
US 7,733,671 B2Granted
Switching regulators
AssigneeMediatek Inc.
InventorsHung-I Chen, Shiue Shin Liu
Life of this patent
Estimating the term…
Abstract
A switching regulator. A pulse width modulation (PWM) unit comprises an output stage and generates a PWM driving signal to control the output stage, such that an inductor delivers an inductor current signal to the load, and a slope compensation unit outputs a slope compensation signal with a compensation slope proportional to a falling slope of the inductor current signal to the PWM unit according to the inductor current signal.
Claims20
A switching regulator, comprising:
- an inductor coupled to a load;
- a pulse width modulation (PWM) unit comprising an output stage, the PWM unit generating a PWM driving signal to control the output stage, such that the inductor delivers an inductor current signal to the load;
- and
- a slope compensation unit outputting a slope compensation signal with a compensation slope proportional to a falling slope of the inductor current signal to the PWM unit according to the inductor current signal, wherein the slope compensation unit detects a rising slope of the inductor current signal and obtains the falling slope of the inductor current signal according to the duty cycle of the PWM driving signal and the detected rising slope of inductor current signal.
1 more element
A slope compensation method for a switching regulator, the method comprising:
- detecting a rising slope of an inductor current signal flowing to a load from a PWM unit;
- detecting a duty cycle of a PWM driving signal generated by the PWM unit;
- generating a slope compensation signal with a compensation slope proportional to a falling slope of the inductor current signal according to the rising slope of the inductor current signal and the duty cycle of the PWM driving signal;
- and
- controlling the PWM unit according to the slope compensation signal.
2 more elements
A switching regulator, comprising:
- an inductor coupled to a load;
- a slope compensation unit coupled to the inductor, the slope compensation unit obtaining a falling slope of an inductor current signal flowing through the inductor according to a rising slope of the inductor current signal and a duty cycle of a pulse width modulation (PWM) driving signal, the slope compensation unit outputting a slope compensation signal with a compensation slope proportional to the falling slope of the inductor current signal;
- a current detection unit detecting the inductor current signal and outputting a current detection signal proportional to the inductor current signal to the slope compensation unit;
- a pulse width modulation unit comprising a comparator receiving the current detection signal, the slope compensation signal, and a feedback signal, and the pulse width modulation unit further comprising at least one output transistor outputting the inductor current signal to the inductor;
- and
- a feedback unit coupled between the comparator and the inductor, the feedback unit generating the feedback signal according to an output voltage of the switching regulator.
3 more elements
Dependencies are inferred from the claim text.