Switching converter with improved transient response
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorZhijiang Yang
Life of this patent
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Abstract
A control circuit for a switching converter. The control circuit includes an input voltage detection circuit, a compensation current generator and a comparison circuit. The input voltage detection circuit generates a first voltage signal indicative of the input voltage and generates a second voltage signal by low-pass filtering the input voltage. The compensation current generator generates a compensation current signal based on the first voltage signal and the second voltage signal. The comparison circuit generates a turning off control signal to control the turning off of a power switch of the switching converter based on the compensation current signal, a current sensing signal indicative of a current flowing through the power switch and a reference signal.
Claims20
A control circuit for a switching converter converting an input voltage to an output voltage, the control circuit comprising:
- an input voltage detection circuit configured to generate a first voltage signal indicative of the input voltage and configured to generate a second voltage signal by low-pass filtering the input voltage;
- a compensation current generator configured to generate a compensation current signal based on the first voltage signal and the second voltage signal;
- and
- a comparison circuit configured to generate a turning off control signal to control the turning off of a power switch of the switching converter based on the compensation current signal, a current sensing signal indicative of a current flowing through the power switch and a reference signal.
A switching converter, comprising:
- a switching circuit having a power switch and configured to convert an input voltage to an output voltage;
- an input voltage detection circuit configured to generate a first voltage signal indicative of the input voltage and configured to generate a second voltage signal by low-pass filtering the input voltage;
- a compensation current generator configured to generate a compensation current signal based on the first voltage signal and the second voltage signal;
- and
- a comparison circuit configured to generate a turning off control signal to control the turning off of the power switch based on the compensation current signal, a current sensing signal indicative of a current flowing through the power switch and a reference signal.
A control method for a switching converter converting an input voltage to an output voltage, the control method comprising:
- monitoring the input voltage;
- generating a compensation current signal varying with a change in the input voltage;
- and
- generating a turning off control signal to control the turning off of a power switch of the switching converter based on the compensation current signal, a current sensing signal indicative of a current flowing through the power switch and a reference signal.
Dependencies are inferred from the claim text.