Apparatus and method thereof for measuring output current...

Details Apparatus and method thereof for measuring output current... Apparatus and method thereof for measuring output current...

2006-06-13

2006-06-13

Tang, Minh N. (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Demand, excess, maximum or minimum

C324S10300R, C363S021160, C363S021180

Reexamination Certificate

active

07061225

ABSTRACT:
An apparatus and method thereof for measuring an output current from a primary side of a power converter are provided. A peak detector is designed to sample a peak value of a converted voltage of a primary-side switching current. A zero-current detector detects a discharge-time of a secondary-side switching current through an auxiliary winding of a transformer. An oscillator generates a switching signal for switching the power converter. An integrator generates an integrated signal by integrating the converted voltage of the primary-side switching peak current with the discharge-time. The time constant of the integrator is correlated with the switching period of the switching signal. The integrated signal is thus proportional to the output current of the power converter.

REFERENCES:
patent: 5901051 (1999-05-01), Takahashi et al.
patent: 6744649 (2004-06-01), Yang et al.
patent: 6862194 (2005-03-01), Yang et al.

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