DCR Inductor Current-Sensing in Four-switch Buck-Boost Converters
AssigneeLinear Technology Corporation
InventorsXu Zhang, Jian Li, Zhouyuan Shi, Yi Ding Gu
Life of this patent
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Abstract
An inductor current-sensing circuit for measuring a current in an inductor includes (a) a first RC network coupled between a first terminal of the inductor and a reference voltage source; and (b) a second RC network coupled between a second terminal of the inductor and the reference voltage source. The first RC network and the second RC network each have a time constant substantially equal to the ratio between the inductance and the DC resistance of the inductor. The inductor which current is being measured may be a primary inductor of a four-switch buck boost converter receiving an input voltage and providing an output voltage.
Claims30
1-21. (canceled)
An inductor current-sensing circuit for measuring a current in an inductor having an inductance and an equivalent DC resistance, comprising:
- a sensing resistor connected in series with the inductor;
- a first RC network coupled between a first terminal of the sensing resistor and a reference voltage source;
- and a second RC network coupled between a second terminal of the sensing resistor and the reference voltage source.
A method for measuring a current in an inductor having an inductance and an equivalent DC resistance, comprising:
- connecting a sensing resistor in series with the inductor;
- coupling a first RC network between a first terminal of the sensing resistor and a reference voltage source;
- coupling a second RC network between a second terminal of the sensing resistor and the reference voltage source;
- and
- measuring a voltage between a node in the first RC network and a node in the second RC network.
Dependencies are inferred from the claim text.