Patent ID: 7629787

Claim:
A current sensor circuit for monitoring current provided to a motor alternately from a first switching component coupled to a high voltage source and a second switching component coupled to a reference voltage, the current sensor circuit providing current sensor signals indicative of the monitored current to related low voltage components, the current sensor circuit comprising: a shunt resistor having a first side coupled to both the first switching component and the second switching component thereby receiving the current to be measured and a second side coupled to the motor to provide current; a first clamper diode having a negative terminal disposed to receive a first input signal, U 1 H, from the first side of the shunt resistor, and having a positive terminal disposed to provide a first output signal, U 1 L, related to said first input signal, U 1 H; a second clamper diode having a negative terminal disposed to receive a second input signal, U 2 H, from the second side of the shunt resistor, and having a positive terminal disposed to provide a second output signal, U 2 L, related to said second input signal, U 2 H; wherein the first clamper diode and the second clamper diode have equal values thereby causing said first and second input signals, U 1 H and U 2 H to be generally related to said first and second output signals, U 1 L and U 2 L, by the equation: U1L−U2L=U1H−U2H.