Systems and arrangements for sensing current with a low loss sense element
AssigneeIntel Corporation
InventorViktor Vogman
Life of this patent
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Abstract
One arrangement includes a sense element to convey a current from a source to a load and a compensation element located proximate to the sense element. The compensation element having a resistance that changes proportional to a change in temperature of the sense element. The arrangement further includes an operational amplifier having a first input connected to the sense element, a second input connected to the compensation element and an output that provides an output signal that biases a current through the compensation element in response to a voltage across the sense element. The bias current provides an output signal proportional to the conveyed current and the compensation element provides temperature compensation for the output signal. Other embodiments are also disclosed.
Claims16
A circuit comprising:
- a sense element to convey current from a source to a load, the sense element having a resistance to change in response to a change in temperature of the sense element;
- a compensation element located proximate to the sense element, the compensation element having a resistance to change in response to the change in the temperature of the sense element;
- an operational amplifier having a first input coupled to the sense element, a second input coupled to the compensation element and an output wherein the operational amplifier to provide a signal on the output proportional to a voltage measured between the first input and the second input;
- and
- an output module having a first input coupled to the output of the operational amplifier, a second input coupled to the second input of the operational amplifier and an output to provide an output signal responsive to the current conveyed from the source to the load and the temperature of the sense element.
Dependencies are inferred from the claim text.