Patent ID: 7471523
Filing Date: 2008-12-30
Classification: G01R,H02M

Abstract:
1. A detection circuit for detecting the discharge time of a magnetic device, comprising: an input circuit coupled to the magnetic device to detect a first voltage and a second voltage of the magnetic device for generating a first signal, a second signal, and a charge-time signal in response to the first voltage and the second voltage, wherein the first voltage is applied to the magnetic device for charging the magnetic device, and the second voltage is applied on the magnetic device during the discharging of the magnetic device; and a control circuit coupled to the input circuit to generate a discharge-time signal in response to the first signal, the second signal, and the charge-time signal, wherein the first signal is correlated to the first voltage, the second signal is correlated to the second voltage, the charge-time signal is correlated to the enable period of the first voltage, and the period of the discharge-time signal represents the discharge time of the magnetic device.