STEP-DOWN SWITCHING MODE POWER SUPPLY AND THE METHOD THEREOF
First Claim
1. A step-down switching mode power supply, comprising:
- a Buck converter having an input terminal configured to receive an input voltage, an output terminal configured to provide power to a load, and a control terminal configured to receive a control signal to regulate the power provided to the load, wherein the Buck converter comprises a power switch and an energy storage component storing or transferring energy as the power switch is turned ON or OFF;
a current sense circuit coupled to the power switch to generate a current sense signal based on a current flowing through the power switch;
a square circuit having an input terminal configured to receive the input voltage, and an output terminal configured to generate a first multiply signal indicating the squared value of the input voltage;
a multiply circuit having a first input terminal coupled to the square circuit to receive the first multiply signal, a second input terminal configured to receive a second multiply signal, and an output terminal configured to generate a product signal based on the first multiply signal and the second multiply signal;
a current comparison circuit having a first input terminal coupled to the current sense circuit to receive the current sense signal, a second input terminal coupled to the multiply circuit to receive the product signal, and an output terminal configured to generate a current comparison signal based on the current sense signal and the product signal; and
a logic circuit coupled between the output terminal of the current comparison circuit and the control terminal of the Buck converter, wherein the power switch is turned OFF by the logic circuit when the current sense signal is larger than or equal to the product signal.
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Accused Products
Abstract
A step-down switching mode power supply having: a Buck converter configured to provide power to a load, wherein the Buck converter has a power switch and an energy storage component; a current sense circuit coupled to the power switch to generate a current sense signal; a square circuit configured to generate a first multiply signal indicating the squared value of the input voltage; a multiply circuit configured to generate a product signal based on the first multiply signal and a second multiply signal; a current comparison circuit configured to generate a current comparison signal based on the current sense signal and the product signal; and a logic circuit configured to control the power switch.
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Citations
12 Claims
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1. A step-down switching mode power supply, comprising:
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a Buck converter having an input terminal configured to receive an input voltage, an output terminal configured to provide power to a load, and a control terminal configured to receive a control signal to regulate the power provided to the load, wherein the Buck converter comprises a power switch and an energy storage component storing or transferring energy as the power switch is turned ON or OFF; a current sense circuit coupled to the power switch to generate a current sense signal based on a current flowing through the power switch; a square circuit having an input terminal configured to receive the input voltage, and an output terminal configured to generate a first multiply signal indicating the squared value of the input voltage; a multiply circuit having a first input terminal coupled to the square circuit to receive the first multiply signal, a second input terminal configured to receive a second multiply signal, and an output terminal configured to generate a product signal based on the first multiply signal and the second multiply signal; a current comparison circuit having a first input terminal coupled to the current sense circuit to receive the current sense signal, a second input terminal coupled to the multiply circuit to receive the product signal, and an output terminal configured to generate a current comparison signal based on the current sense signal and the product signal; and a logic circuit coupled between the output terminal of the current comparison circuit and the control terminal of the Buck converter, wherein the power switch is turned OFF by the logic circuit when the current sense signal is larger than or equal to the product signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling a step-down switching mode power supply, wherein the step-down switching mode power supply comprises a Buck converter, and wherein the Buck converter comprises a power switch and an energy storage component configured to store energy or to transfer energy to a load as the power switch is turned ON or OFF, the method comprising:
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sampling an input voltage of the Buck converter to generate an input voltage sample signal; sensing a current flowing through the power switch to generate a current sense signal; squaring the input voltage sample signal to generate a first multiply signal; multiplying the first multiply signal with a second multiply signal to generate a product signal based thereupon; comparing the current sense signal with the product signal; and turning OFF the power switch when the current sense signal is larger than or equal to the product signal. - View Dependent Claims (10, 11, 12)
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Specification