METHOD AND APPARATUS FOR MEASURING THE SWITCHING CURRENT OF POWER CONVERTER OPERATED AT CONTINUOUS CURRENT MODE
First Claim
1. A method for detecting a switching current of a power converter, comprising:
- generating a sample signal in accordance with the pulse width of a switching signal of the power converter;
sampling the waveform of the switching current during the period of the switching signal and the sample signal for generating a first current signal and a second current signal;
generating output signals in accordance with the first current signal and the second current signal; and
wherein the switching signal is used for switching a magnetic device of the power converter, and the output signals are corrected to the value of the switching current.
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Abstract
An apparatus for detecting a switching current of the power converter, wherein the apparatus includes a signal generation circuit, a sample-and-hold circuit, and a calculating circuit. The signal generation circuit generates a sample signal in accordance with the pulse width of a switching signal. The sample-and-hold circuit is coupled to receive the sample signal and switching current signal for generating a first current signal and a second current signal. The calculating circuit is coupled to receive the first current signal and the second current signal for generating output signals. The switching signal is used for switching the magnetic device of the power converter, and the switching current signal is correlated to the switching current of the power converter; the output signals are correlated to the value of the switching current of the power converter.
22 Citations
15 Claims
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1. A method for detecting a switching current of a power converter, comprising:
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generating a sample signal in accordance with the pulse width of a switching signal of the power converter; sampling the waveform of the switching current during the period of the switching signal and the sample signal for generating a first current signal and a second current signal; generating output signals in accordance with the first current signal and the second current signal; and wherein the switching signal is used for switching a magnetic device of the power converter, and the output signals are corrected to the value of the switching current. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for detecting a switching current of the power converter, comprising:
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a signal generation circuit generating a sample signal in accordance with the pulse width of a switching signal; a sample-and-hold circuit coupled to receive the sample signal and switching current signal for generating a first current signal and a second current signal; and a calculating circuit couple to receive the first current signal and the second current signal for generating output signals; wherein the switching signal is used for switching a magnetic device of the power converter, and the output signals are correlated to the value of the switching current of the power converter. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for detecting a switching current of a power converter, comprising:
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generating a switching current signal in accordance with the switching current of the power converter; defining a peak point and a sampled point in a waveform of the switching current signal; and calculating output signals according to the slope between the peak point and the sampled point. - View Dependent Claims (14, 15)
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Specification