Current sensing and motor control
AssigneeInfineon Technologies Austria AG
InventorsTao Zhao, Vatche OKNAIAN
Life of this patent
Estimating the term…
Abstract
A controller associated with a power supply determines a first ratio value. The first ratio value may be a ratio of a second time duration with respect to a first time duration, where the second time duration is a measured time duration associated with demagnetizing of a transformer in a first control cycle. The first time duration may be a measured time duration of activating a first switch in the first control cycle, where activation of the first switch operative to control a magnitude of primary current through a primary winding of the transformer. For second control cycle occurring subsequent to the first control cycle, the controller calculates an ON-time duration for activating the second switch based on the determined first ratio value.
Claims20
An apparatus comprising:
- first switch circuitry including a first node and a second node, the first node operative to receive first current, the first switch circuitry operative to control conveyance of the first current received at the first node through the first switch circuitry and out the second node of the first switch circuitry;
- and
- a monitor circuit operative to:
- i) receive a first signal outputted from a third node of the first switch circuitry, and ii) produce a second signal indicative of a magnitude of the first current.
A method comprising:
- receiving a first signal outputted from first switch circuitry, the first switch circuitry including a first node and a second node, the first switch circuitry operative to control conveyance of first current received at the first node of the first switch circuitry through the first switch circuitry and out the second node of the first switch circuitry, the first signal received from a third node of the first switch circuitry;
- and
- converting the received first signal into a second signal indicative of a magnitude of the first current.
Dependencies are inferred from the claim text.