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 a 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;
wherein the switching signal is used for switching a transformer, and the output signals are correlated to the value of the switching current; and
wherein a pulse width of the sample signal is a ratio of a pulse width of the switching signal.
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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.
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Citations
13 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 a 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; wherein the switching signal is used for switching a transformer, and the output signals are correlated to the value of the switching current; and wherein a pulse width of the sample signal is a ratio of a pulse width of the switching signal. - 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 a pulse width of a switching signal; a sample-and-hold circuit configured to receive the sample signal and switching current signal for generating a first current signal and a second current signal; and a calculating circuit configured to receive the first current signal and the second current signal for generating output signals; wherein the switching signal is used for switching a transformer, and the output signals are correlated to the value of the switching current of the power converter; and wherein a pulse width of the sample signal is a ratio of a pulse width of the switching signal. - 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; calculating output signals according to the slope between the peak point and the sampled point; and generating a continuous current and a ramp current in response to a current and a pulse width of the sample point and the peak point, wherein the output signals comprise a DC-output signal and an AC-output signal, the DC-output signal is correlated to the continuous current of the switching current, and the AC-output signal is correlated to the ramp current of the switching current.
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Specification