Patent ID: 7630222

Claim:
An inverter apparatus with an adaptable voltage-to-frequency control, comprising: a first circuit receiving an analog input voltage, and comprising: a bi-directional clipper circuit providing a first positive voltage and a negative voltage for the analog input voltage to generate a first clipping voltage; a first gain unit electrically connected to the bi-directional clipper circuit and providing a first voltage gain for the first clipping voltage to generate a first gain voltage; and a DC-offset unit electrically connected to the first gain unit and providing a DC-offset voltage for the first gain voltage to generate a first analog output voltage; a second circuit simultaneously receiving the analog input voltage, and comprising: a positive clipper circuit providing a second positive voltage for the analog input voltage to generate a second clipping voltage; and a second gain unit electrically connected to the positive clipper circuit and providing a second voltage gain for the second clipping voltage to generate a second analog output voltage; a third circuit simultaneously receiving the analog input voltage, and comprising: a negative clipper circuit providing a second negative voltage for the analog input voltage to generate a third clipping voltage; and a third gain unit electrically connected to the negative clipper circuit and providing a third voltage gain for the third clipping voltage to generate a third analog output voltage; and a micro-controller unit electrically connected to the first circuit, the second circuit, and the third circuit, and comprising: an analog-to-digital converter unit receiving the first, the second, and the third analog output voltages; and converting the three analog output voltages into a first digital output value, a first complement digital output value, a second digital output value, and a third digital output value respectively; and a frequency operation unit electrically connected to the analog-to-digital converter unit and generating a corresponding output frequency according to the selected largest digital output value.