| 摘要 |
PURPOSE: A half wave rectifier of a sensorless stroke estimator is provided to reduce the voltage drop of a rectifier diode in a rectifying process with the large open loop gain of an amplifier by connecting the rectifier diode into a return loop of the amplifier. CONSTITUTION: A half wave rectifier consists of: a non-inverse amplifier(1) inputting stroke sine waves to a non-inverse terminal(+) and a stroke control signal having the stroke sine waves rectified into half waves to an inverse terminal(-); a rectifier diode(D) having a cathode connected to the output terminal of the non-inverse amplifier and an anode connected to the inverse terminal of the non-inverse amplifier; a resistance(R) having a side connected to grounding voltage and the other side connected with the anode of the rectifier diode; and a signal amplifier(2) amplifying the stroke control signal of the rectifier diode into a specific level. The output of the non-inverse amplifier is rectified into half waves, and the half-wave-rectified stroke sine waves are amplified into a specific level in the signal amplifier. Then, the sine waves are returned to the inverse terminal of the non-inverse amplifier. Herein, the turn-on voltage of the rectifier diode is about 0.6 micro-V for the open loop gain of the non-inverse amplifier is about 1000000 times. Thereby, the voltage drop by the ambient temperature can be ignored. Herein, the resistance feeds the grounding voltage to keep the output level of the rectifier diode regular.
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