Apparatus and method for sensing opening and shutting of wireless communication terminal by using strain gauge
View Patent ↗Provided is an apparatus and method for sensing the opening and shutting by using a strain gauge. The apparatus and method can reduce power consumption by using an output value of an analog-to-digital converter based on an output voltage value to sense opening and shutting and supplying or shutting off power. The opening and shutting apparatus includes: a strain gauge having a resistance value which is varied as the strain gauge is deformed by an external force; a voltage distributor for distributing voltage to the strain gauge based on the resistance value; an analog-to-digital (A/D) converter for converting the voltage of the strain gauge into a digital output value; and a controller for controlling the power to be supplied to or shut off from predetermined elements of a wireless communication terminal by sensing the opening and shutting based on the output from the A/D converter.
1. An opening and shutting apparatus provided with a power supplier, comprising:
a strain gauge having a resistance value which is varied as the strain gauge is deformed by an external force;
a voltage distributor connected in series between the power supplier and the strain gauge to distribute a voltage to the strain gauge based on the resistance value;
an analog-to-digital (A/D) converter for converting the voltage of the strain gauge into a digital signal as an output;
a controller for controlling a power to be supplied to or shut off from predetermined elements of a wireless communication terminal by sensing an opening and shutting based on the output from the A/D converter; and
a capacitor connected in series to the power supply via the voltage distributor to remove noise from the power supplied from the power supplier.
2. The opening and shutting apparatus as recited in claim 1 , wherein the strain gauge is positioned in a hinge.
3. A method for sensing opening and shutting utilizing an opening and shutting apparatus provided with a power supplier, including a strain gauge having a resistance value which is varied as the strain gauge is deformed by an external force, a voltage distributor connected in series between the power supplier and the strain gauge to distribute a voltage to the strain gauge based on the resistance value, an analog-to-digital (A/D) converter for converting the voltage of the strain gauge into a digital signal as an output, a controller for controlling a power to be supplied to or shut off from predetermined elements of a wireless communication terminal by sensing an opening and shutting based on the output from the A/D converter, and a capacitor connected in series to the power supply via the voltage distributor to remove noise from the power supplied from the power supplier, comprising the steps of:
a) changing the resistance value as deformation is applied to the strain gauge;
b) changing the voltage of the strain gauge based on the changed resistance value;
c) converting the voltage of the strain gauge into a digital signal; and
d) supplying or shutting off the power to or from predetermined elements of a wireless communication terminal by sensing the opening and shutting based on the digital signal.
4. The method as recited in claim 3 , wherein the step d) includes the steps of:
d1) comparing the digital output value with a predetermined value;
d2) if the digital output value is equal to or larger than the predetermined value, supplying the power to the predetermined elements; and
d3) if the digital output value is smaller than the predetermined value, shutting off the power from the predetermined elements.