Controlling method for capacitive sensors
First Claim
1. A method for controlling a capacitive sensor in a vibrating mirror motor system comprising a capacitive sensor, a subtraction circuit and an adder circuit connected with the capacitive sensor, a high-frequency power supply for providing energy to the capacitive sensor, a digital-analog converter, and a digital gain stage adjuster having a digital potentiometer being connected to a microprocessor, wherein the method comprises:
- summing, by the adder circuit, values obtained by the capacitive sensor;
comparing, in a comparison circuit, the summed values from the adder circuit with a target gain control value generated by the digital-analog converter;
providing a gain adjustment value to the high-frequency power supply, said gain adjustment value based on the comparing;
outputting a position signal by the digital gain stage adjuster after adjusting a value resulted from the subtraction circuit performing subtraction on values obtained at said capacitive sensor; and
before outputting the position signal by the digital gain stage adjuster, setting a stage coefficient of the digital potentiometer by the microprocessor.
1 Assignment
0 Petitions
Accused Products
Abstract
A controlling method for capacitive sensors in a vibrating mirror motor system includes a capacitive sensor, a subtraction circuit and an adder circuit connected to the capacitive sensor, a high frequency power supply providing power for the capacitive sensor, a D/A converter, and a gain stage adjustment device, wherein values obtained at the capacitive sensor are summed through the adder circuit, then the summed value and a value processed by the D/A converter are input to a comparator which comparing the values, and a gain adjusting value is obtained and supplied to the high frequency power supply, meanwhile the values obtained by capacitive sensor are subtracted by the subtraction circuit and then adjusted by the gain stage adjustment device, finally a position signal is outputted.
21 Citations
10 Claims
-
1. A method for controlling a capacitive sensor in a vibrating mirror motor system comprising a capacitive sensor, a subtraction circuit and an adder circuit connected with the capacitive sensor, a high-frequency power supply for providing energy to the capacitive sensor, a digital-analog converter, and a digital gain stage adjuster having a digital potentiometer being connected to a microprocessor, wherein the method comprises:
-
summing, by the adder circuit, values obtained by the capacitive sensor; comparing, in a comparison circuit, the summed values from the adder circuit with a target gain control value generated by the digital-analog converter; providing a gain adjustment value to the high-frequency power supply, said gain adjustment value based on the comparing; outputting a position signal by the digital gain stage adjuster after adjusting a value resulted from the subtraction circuit performing subtraction on values obtained at said capacitive sensor; and before outputting the position signal by the digital gain stage adjuster, setting a stage coefficient of the digital potentiometer by the microprocessor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A circuit for controlling a capacitive sensor in a vibrating mirror motor system comprising:
- a capacitive sensor, a subtraction circuit and an adder circuit, a high-frequency power supply for providing energy to the capacitive sensor, a digital-analog converter providing a target gain control value for use in tuning the capacitive sensor, and a digital gain stage adjuster having a digital potentiometer;
wherein the capacitive sensor being connected with the subtraction circuit, the adder circuit, and the high-frequency (HF) power supply, the subtraction circuit being connected with the gain stage adjuster.
- a capacitive sensor, a subtraction circuit and an adder circuit, a high-frequency power supply for providing energy to the capacitive sensor, a digital-analog converter providing a target gain control value for use in tuning the capacitive sensor, and a digital gain stage adjuster having a digital potentiometer;
-
10. A method for controlling a capacitive sensor in a vibrating mirror motor system comprising:
-
summing, by an adder circuit, values obtained by the capacitive sensor; comparing, in a comparison circuit, the summed values from the adder circuit with a target gain control value generated by the digital-analog converter; providing a gain adjustment value to a high-frequency power supply supplying energy to the capacitive sensor, the gain adjustment value based on the comparing; outputting a position signal by a digital gain stage adjuster having a digital potentiometer after adjusting a value resulted from the subtraction circuit performing subtraction on values obtained at said capacitive sensor; and before outputting the position signal by the digital gain stage adjuster, setting a stage coefficient of the digital potentiometer by the microprocessor.
-
Specification