Patent ID: 6807871
Filing Date: 2004-10-26
Classification: G01L

Abstract:
A torque detector, comprising:a synchronous detector to detect an Alternating Current (AC) voltage signal having a preset Direct Current (DC) voltage level and a certain frequency, and generate a detection output signal; a bridge circuit in which a torque detection coil whose inductance varies with rotation of a steering wheel and a temperature compensation coil whose inductance varies with temperature variation are connected in series to each other, the detection output signal and the DC voltage being applied to both ends of the two connected coils, respectively, the bridge circuit allowing a first detection voltage to be induced at a connecting point between the two coils by variation of the inductance of the two coils; and a signal converter to generate a torque detection signal having an amplitude corresponding to a difference between peak values of a preset reference voltage and the first detection voltage.