Abstract: The present invention discloses a capacitive button device, comprising: a signal input unit, a first amplifier, a first switching unit, a second amplifier, a second switching unit, an analog-to-digital converting unit, a third switching unit, a data output unit, a data storage unit and a digital-to-analog converting unit. Thereby, the present invention overcomes the problem due to poor resolution of conventional capacitive buttons and can be used with touch panels. Moreover, the digital-to-analog converting unit is downsized with improved resolution and reduced cost in design and fabrication.

Abstract: The present invention discloses a capacitive button device, comprising: a signal input unit, a first amplifier, a first switching unit, a second amplifier, a second switching unit, an analog-to-digital converting unit, a third switching unit, a data output unit, a data storage unit and a digital-to-analog converting unit. Thereby, the present invention overcomes the problem due to poor resolution of conventional capacitive buttons and can be used with touch panels. Moreover, the digital-to-analog converting unit is downsized with improved resolution and reduced cost in design and fabrication.

Abstract: A digital-to-analog converting circuit for power soft-switching, comprising: a metal-oxide-semiconductor field-effect transistor (MOSFET); a digital-to-analog control circuit, for controlling the MOSFET to operate in either the cut-off region, the saturation region or the linear region; a digital control unit, using an output signal so as to control an input current into the MOSFET; and a DC-to-DC inverter, controlled by the MOSFET so as to invert external DC power into a certain level for electronic products.

Abstract: A digital pulse width modulation (DPWM) controlling system for controlling a load of an application circuit with a DPWM unit is provided, which comprises a comparator and a micro-control unit, the comparator receiving a sense signal detected from the load and a reference signal and comparing the sense signal and the reference signal to output an analog comparison signal, and the micro-control unit generating a trigger signal having a minimum pulse width and receiving the analog comparison signal to output a DPWM signal, wherein the micro-control unit adjusts the minimum pulse width of the trigger signal to obtain a pulse width of the DPWM signal in response to the analog comparison signal whenever the sense signal is within a stable duration so as to output the DPWM signal to the application circuit to control the load.

Abstract: A detection method for a touch-panel device having a touch pad electrically connected to at least m×n equivalent capacitors is provided, wherein m is a number of the equivalent capacitors on a specific one of rows and n is a number of the equivalent capacitors on a specific one of columns. The method includes steps of: (a) charging the m equivalent capacitors on the specific row to obtain m digital signals; (b) comparing potentials of the m digital signals and obtaining a relatively smallest potential as a standard value; (c) repeating the steps (a)˜(b) to obtain n the standard values for the m×n equivalent capacitors; (d) touching the touch pad; (e) scanning the touch pad to obtain at least a potential variation value relative to the standard value for the m equivalent capacitors on the specific row; and (f) comparing the standard value with the variation value to identify a touched point on the touch pad.

Abstract: A controlling device for the cursor and the method for operating the same are provided. The controlling device includes a capacitor array having a plurality of equivalent capacitors, a microprocessor electrically connected to the capacitor array for sending a pulse train to the capacitor array in the x-direction and receiving a potential of each equivalent capacitor in the y-direction so as to determine a movement of a cursor, and a charge-absorbing device disposed above the capacitor array, wherein when the charge-absorbing device is moved correspondingly to a position of a specific equivalent capacitor in the capacitor array, a storage charge of the specific equivalent capacitor is absorbed so that the potential thereof is lowered, and thereby the movement of the cursor is determined by the microprocessor.

Abstract: An identification method for a touch control device having a memory and a pad electrically connected to an equivalent capacitance is provided. The provided identification method for a touch control device includes steps of: (a) charging the equivalent capacitance for obtaining a first voltage value; (b) storing the first voltage value in the memory; (c) touching the pad; (d) scanning the pad for obtaining a second voltage value of the equivalent capacitance; and (e) comparing the first voltage value with the second voltage of the equivalent capacitance for identifying a touched position on the pad.

Abstract: Disclosed is an apparatus for induced capacitor, an insulating substrate; and a plurality of capacitive sensing devices, being arranged on the insulating substrate in a matrix form, each of the plurality of capacitive sensing devices further comprising: a first electrode; and a second electrode, having an inner rim and an outer rim, being disposed circumferentially surrounding the first electrode while separating the second electrode from first electrode by a distance so as to form an equivalent capacitance therebetween, wherein a potential of each capacitive sensing device formed between the two electrodes is adjusted to be a predetermined value by adjusting the distance between the inner rim of the second electrode and the circumference of the first electrode while keeping the outer rim of the second electrode fixed.