METHOD AND APPARATUS FOR DETECTING DEMAGNETIZING TIME OF MAGNETIC DEVICE
First Claim
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.
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Abstract
A detection circuit for detecting the demagnetizing time of a magnetic device is provided. An input circuit is coupled to the magnetic device for detecting a magnetizing voltage and a demagnetizing voltage of the magnetic device. A control circuit is coupled to the input circuit for generating a demagnetizing-time signal in response to the magnetizing voltage, the demagnetizing voltage, and a magnetizing time. The magnetizing time is correlated to the enable period of the magnetizing voltage. The demagnetizing time of the magnetic device is represented by the demagnetizing-time signal.
24 Citations
15 Claims
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1. A detection circuit for detecting the discharge time of a magnetic device, comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. A detection circuit to detect the demagnetizing time of a magnetic device, comprising:
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an input circuit coupled to the magnetic device for detecting a magnetizing voltage and a demagnetizing voltage of the magnetic device; and a control circuit coupled to the input circuit for generating a demagnetizing-time signal in response to the magnetizing voltage, the demagnetizing voltage, and a magnetizing time, wherein the magnetizing time is correlated to the enable period of the magnetizing voltage, and the demagnetizing-time signal represents the demagnetizing time of the magnetic device. - View Dependent Claims (6, 7, 8)
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9. An apparatus for detecting demagnetizing time of a magnetic device, comprising:
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a voltage source; a first switch connected to the voltage source; a transformer, having a primary winding and a secondary winding with a first node and a second node, wherein the primary winding is connected to the first switch; a detection circuit for detecting the demagnetizing time of the transformer, having a first voltage node, a second voltage node, and a ground node, wherein the first voltage node is connected to the first node of the secondary winding, the second voltage node is connected to the second node of the secondary winding, the ground node is connected to the ground, and the detection circuit further comprising; an input circuit; a control circuit coupled to the input circuit; a diode connected to the first node of the secondary winding and the ground; and an output load connected to the second node of the secondary winding and the ground. - View Dependent Claims (10, 11)
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12. An apparatus for detecting demagnetizing time of a magnetic device, comprising:
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a detection circuit, having a first voltage node, a second voltage node, and a ground node, wherein the first voltage node is connected to the first node of the magnetic device, the second voltage node is connected to the second node of the magnetic device, and the ground node is connected to the ground and the detection circuit further comprising an input circuit and a control circuit; and an output circuit connected to the second node of the magnetic device and the ground. - View Dependent Claims (13, 14, 15)
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Specification