| 摘要 |
A signal converter for a motor drive of an electric motor comprises an operational amplifier, having an inverting input, a noninverting input and an output, and an integrator, the output signal of which being provided as a reference signal to the inverting input of the operational amplifier. An actual signal level corresponding to a measured voltage level as well as an auxiliary signal are provided to the noninverting input of the operational amplifier. The integrator is connected to a first summing point. The first summing point is connected by way of a first lowpass filter to the output of the operational amplifier and by way of a second lowpass filter to the noninverting input of the operational amplifier. The noninverting input of the operational amplifier is also coupled by way of a second summing point to the actual signal input and to an amplifier circuit. A reference signal is provided to a first input of the amplifier. A second input of the amplifier circuit is coupled by way of a sign circuit to the actual signal input, and a third input of the amplifier is connected by way of a gain selection circuit to a measuring range input signal. The signal converter is capable of high linearity and high resolution.
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