Switching power converter, control circuit and integrated circuit therefor, and constant-current control method
First Claim
1. A control circuit configured to control a power stage circuit comprising a first power transistor, a second power transistor and an inductor, comprising:
- a valley-value obtaining circuit configured to obtain a first voltage representing a valley value of an electric current through said first power transistor;
a peak-value obtaining circuit configured to obtain a second voltage representing a peak value of an electric current through said second power transistor;
a compensation signal generating circuit configured to generate a compensation signal representing a difference between a desirable inductor current and an average value of a peak value and a valley value of an inductor current in accordance with said first voltage, said second voltage and a reference voltage; and
a control signal generating circuit configured to generate a first control signal for controlling said first power transistor and a second control signal for controlling said second power transistor in accordance with said compensation signal.
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Accused Products
Abstract
The present disclosure relates to a switching power converter, a control circuit and an integrated circuit therefor, and a constant-current control method. The control circuit samples a valley value of an electric current through a first power transistor in a power stage circuit and a peak value of an electric current through a second power transistor in the power stage circuit, and obtains parameters representing an output current in accordance with an average value of the valley value and peak value. Thus, the constant-current control can be performed by sampling the electric current through the first power transistor and the second power transistor. Moreover, the switching power converter simplifies a current feedback loop for outputting a constant current, and the integrated circuit has fewer pins.
9 Citations
11 Claims
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1. A control circuit configured to control a power stage circuit comprising a first power transistor, a second power transistor and an inductor, comprising:
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a valley-value obtaining circuit configured to obtain a first voltage representing a valley value of an electric current through said first power transistor; a peak-value obtaining circuit configured to obtain a second voltage representing a peak value of an electric current through said second power transistor; a compensation signal generating circuit configured to generate a compensation signal representing a difference between a desirable inductor current and an average value of a peak value and a valley value of an inductor current in accordance with said first voltage, said second voltage and a reference voltage; and a control signal generating circuit configured to generate a first control signal for controlling said first power transistor and a second control signal for controlling said second power transistor in accordance with said compensation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A constant-current control method for controlling a power stage circuit comprising a first power transistor, a second power transistor and an inductor, comprising:
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obtaining a first voltage representing a valley value of an electric current through said first power transistor, and a second voltage representing a peak value of an electric current through said second power transistor; generating a compensation signal representing a difference between a desirable inductor current and an average value of a peak value and a valley value of an inductor current in accordance with said first voltage, said second voltage and a reference voltage; generating a first control signal for controlling said first power transistor and a second control signal for controlling said second power transistor in accordance with said compensation signal. - View Dependent Claims (11)
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Specification