AC and DC temperature compensation scheme for DCR current sense

Details AC and DC temperature compensation scheme for DCR current sense AC and DC temperature compensation scheme for DCR current sense

2008-12-19

2011-12-06

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S285000, C323S907000

Reexamination Certificate

active

08072200

ABSTRACT:
A current sensing circuit with AC and DC temperature compensation for sensing current through an output inductor which has an inherent DC resistor with a temperature varying resistance. A first RC circuit is coupled across the output inductor and has a time constant. The first amplifier provides a sense signal indicative of voltage of the first RC circuit. The second RC circuit is coupled to a first correction node and receives the sense signal. The second resistor has a temperature varying resistance so that the second RC circuit has a time constant commensurate with a time constant of the output inductor. The third RC circuit is coupled to a second correction node and has a time constant equal commensurate with the first RC circuit. The second amplifier provides a corrected sense signal based on the correction nodes.

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