INDUCTOR CURRENT ZERO-CROSSING DETECTION METHOD AND CIRCUIT AND SWITCHING POWER SUPPLY THEREOF
First Claim
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1. A method of detecting an inductor current zero-crossing in a switching power supply, the method comprising:
- a) determining a present output voltage of said switching power supply;
b) generating a zero-crossing detection threshold voltage according to said output voltage; and
c) generating a zero-crossing detection signal according to said zero-crossing detection threshold voltage, wherein said zero-crossing detection signal is used to turn off a synchronous rectifier switch in said switching power supply.
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Abstract
In one embodiment, a method of detecting an inductor current zero-crossing in a switching power supply, can include: (i) determining a present output voltage of the switching power supply; (ii) generating a zero-crossing detection threshold voltage according to the output voltage; and (iii) generating a zero-crossing detection signal according to the zero-crossing detection threshold voltage, where the zero-crossing detection signal is used to turn off a synchronous rectifier switch in the switching power supply.
11 Citations
17 Claims
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1. A method of detecting an inductor current zero-crossing in a switching power supply, the method comprising:
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a) determining a present output voltage of said switching power supply; b) generating a zero-crossing detection threshold voltage according to said output voltage; and c) generating a zero-crossing detection signal according to said zero-crossing detection threshold voltage, wherein said zero-crossing detection signal is used to turn off a synchronous rectifier switch in said switching power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An inductor current zero-crossing detection circuit configured in a switching power supply, the circuit comprising:
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a) an output voltage sampling circuit configured to determine a present output voltage of said switching power supply; b) a zero-crossing detection threshold voltage generating circuit configured to generate a zero-crossing detection threshold voltage according to said output voltage; and c) a zero-crossing detection circuit configured to generate a zero-crossing detection signal according to said zero-crossing detection threshold voltage, wherein said zero-crossing detection signal is used to turn off a synchronous rectifier switch in said switching power supply. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification