Circuit for sensing motor load current
First Claim
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1. A current sensing circuit, comprising:
- a resistive shunt adapted to be coupled, at its one end, to the junction of a half bridge, high-side, low-side transistor pair and, at its other end, to a load such that a sensed voltage across the shunt is proportional to the current delivered to the load; and
a level shifting circuit adapted to transpose the sensed voltage to a lower potential referenced to ground, such that a feedback voltage is produced from the sensed voltage which may be used to control commutation of the half bridge transistors.
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Abstract
A current sensing circuit including a shunt resistor coupled, at one end, to the low-side transistor of a half bridge circuit and, at its other end, to a load. The voltage sensed across the shunt resistor is proportional to the current delivered to the load. A level shifting circuit is provided to transpose the sensed voltage to a low voltage signal which can be fed back to control commutation of the transistors in the half bridge circuit.
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Citations
10 Claims
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1. A current sensing circuit, comprising:
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a resistive shunt adapted to be coupled, at its one end, to the junction of a half bridge, high-side, low-side transistor pair and, at its other end, to a load such that a sensed voltage across the shunt is proportional to the current delivered to the load; and a level shifting circuit adapted to transpose the sensed voltage to a lower potential referenced to ground, such that a feedback voltage is produced from the sensed voltage which may be used to control commutation of the half bridge transistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification