WO2009110814A2

WO2009110814A2 - Standup senzor

Info

Publication number: WO2009110814A2
Application number: PCT/RS2009/000007
Authority: WO
Inventors: Boban Stojanovic
Original assignee: Boban Stojanovic
Priority date: 2008-03-04
Filing date: 2009-03-02
Publication date: 2009-09-11
Also published as: WO2009110814A3

Abstract

Standup sensor is sensor which when not held in hand is inactive (1)(2)(3) When held in hand sensor detects the hand as an electrolyte or conductor and the electronics switches the device on or it is switched to the other operating mode. The device stays on for a while. If the device is meanwhile put in to horizontal or vertical position, after awhile the device will switch off regardless of its position.

Description

STANDUP SENZOR

TECHNICAL FIELD

The invention is from the field of electronics and electrical engineering and is used as an extension to electrical devices for detection of hand that holds the device and for activation and stalling up of the device it self. The device has been made as the upgrade of the author's applications P-2006/0439 from 19.07.2006 submitted at The Institute for intellectual property of Serbia and WIPO PCTRS2007/000013 i.e. (WO-2008-010739) MUSIC FOR CHILDREN'S EDUCATIONAL POTTY, as well as the applications Horizontal capacitive sensor P-2008/0063 from 14.02.2008, (PCTRS2008/000005 from 13.02.2009) also from the same author.

TECHNICAL PROBLEM

Technical problem which has to be resolved by subject invention consists in structure of sensor with corresponding electronic arrangement intended for the detection if extremely low capacitance's, respectively detecting the hand on the electrical devices.

Fig. 1: represent the perspective and top view of the subject sensor;

Fig. 2: represent the perspective and top view of the subject sensor;

Fig. 4: represent schematic connection of sensor into corresponding electronic circuit.

Fig. 4: schematic diagram of capacitive sensor

DISCLOSURE OF THE INVENTION

In the picture 1 is a cross section of the device handle where you can see that the electrodes El and E2 made from conductor (al foil, copper foil or the conductor of semi circular shape). The angle that the electrodes make is less than 180 degrees (picture 2) i.e. there has to be the space between the electrodes so the capacity between the El and E2 would be minimal. When a hand is leaned, electrodes El and E2 make a condenser that has a surface equal to the surface of the leaned part of the hand, about couple of square centimeters, and the distance between the electrodes is treated by approximately a couple of mm. The capacitive sensor is on the inner side of the handle and is tightened to the handle plastic. The length of the sensor and its surface give a capacity, which is when iron is in hand about IpF. Because the hand is by its content mostly made of blood that say electrolytes, emergent capacity is in-line capacity between electrode El, blood (electrolyte) and the capacity between the electrolyte and electrode E2.

Fig, 3 -.The electrode El or one end of the variable condenser Cx is connected to the resistor Rl and the input 1 of the integrated circuit 4069 CMOS. The electrode E2 or the other end of Cx is connected to the outlets 4 and 5 IC4069. The other end of the resistor Rl is connected to output 6 IC 4069. The output 7 IC is connected to the mass. The outputs 2 and 3 are connected to the one end of the resistor R2. The output 14 IC is connected to the ends of R3 and C2, which are parallel. The second end of the R3 and C2 is connected to Vcc or univocal power supply. Their function is to put IC in such operating mode where the IC consumption will not be great, about 0.002 mA. The other end of the R2 is connected to the output 13 of integrated circuit and condenser Cl. The other end of the condenser Cl is connected to 1 1 and 12 outputs of IC 4069 CMOS . The output 10 of the IC is connected to the output of 9 IC. Output 8 is connected to the input of the mono- stable multi-vibrator (timer) i.e. to the one of the inputs of NORl. Mono-stable multi-vibrator (timer) is realized with two NOR or NAND circuits, condenser C3 and resistor R4. The time constant of the multivibrator is about 1,5 minutes and that is the period during which the device will operate since the last contact with the device. Instead of the mono-stable multi-vibrator it is possible to use integrated timers or counter connected to IC4069 CMOS. The other input NORl is connected to NOR2 output. Both of NOR2 inputs are connected to C3 and R4. The second end of the C3 is connected to the output NORl. The other end of the R4 is connected to Vcc. NOR2 output is also connected to Vi. Vi is the voltage that powers on the device (wireless computer mouse, talky-wacky and the like)or it can use Vi voltage to switch to other operating mode.Fig. 4:To electrodes El and E2 are connected inverters NOTl - NOT6 and resistors Rl, R2 and capacitor C2, so that form an electric circuit working similarly to a-stabile multi-vibrator (osc.) known also by its ability to oscillate also without any capacitance, with notification that three inverters have great amplification in transition mode in respect to a-stabile multi-vibrators realized with two inverters. In order for better understanding the operation mode of the device, we will observe fringing case where the circuit is starting to oscillate. Capacitance of the variable capacitor Cx is at that moment minimal and almost equal to zero. In order that circuit do not oscillate, it is necessary that output currents of inverter are as tiny as possible, and in order that these currents are as tiny as possible, the supply voltage of logic circuits should be also as low as possible, i.e. the supply voltage of inverters is in that case very close to the minimal supply voltages given in the manufacturers specification. In such case maximal output currents of inverters are minimal. In case that variable capacitance of capacitor is Cx=O and that do not exist any parasitic capacitance (circuit is supplied by approximately lowest voltage for this kind of logic circuits, so that inverters output currents may be minimal) the circuit will not oscillate. Inputs and outputs of the first three inverters NOTl, NOT2 and N0T3 are adjusted to approximately on half supply voltage. When the resistance Rl value is adjusted so that it has extremely high extent it will appear a very small voltage drop between inverter NOT3 output and inverter NOTl input. Since Cx is stil equal zero (Cx=O), inputs i.e. outputs of inverter NOT 1-3 alternatively are very close to the half voltage value but with a small voltage drop in relation to half voltage of supply voltage. Since inverters NOTl, NOT2 and NOT3 work in mode adjacent to half supply voltage, these are acting in this mode as non-linear amplifiers with negative amplification. Considering that the inverter NOT4 is connected to output of inverter NOTl, through resistor R2, it also act as non-linear amplifier with negative amplification. Since is to inverters output and input connected capacitor C2 and to the input of inverter NOT4 the resistor R2 also, than these three components act as non-linear integrator. Such integrator have high amplification for the low frequencies and for the high frequencies have no amplification, so these three components act somehow similar to LF filter. Accordingly when Cx is of small value and the frequency f is high, Cx does not involve any changes in output. With appearance of exceptionally small capacitance, the circuit start to oscillate with high frequency. If frequency f is enough high Cx do not involve any changes on output, since non-linear integrator for these frequencies has amplification less than 1. If through non-linear integrator is derived certain signal, the lowest harmonic of this signal bring the changes in output of non-linear integrator. Which means that for the enough high Cx capacitance i.e. for low frequency f (respectively the lowest harmonic of non-regular floatable voltage) in the output of NOTl we have changes in output of NOT4. Since NOT5 and NOT6 have very high amplification, the output voltage Vi is either logic 1 or logic O. For enough high Cx, respectively for enough low f, inverters NOT4, NOT5 and NOT6 have very high amplification and in output we have logic 1. For low Cx there are no changes and in output we have logic 0

Claims

1. Standup sensor Cx (1) is characterized by that it consists of two electrodes El and E2 that without a hand as an electrolyte (1) have minimal capacity and with hand (2) give certain capacity which induces a-stabile multi-vibrator (3) which generates fixed (3) or variable voltage Vi (4).

2. Standup sensor Cx (1) is characterized by that it detects object as conductor (2)at distance where effective capacity Cx is sufficient to induce the multi-vibrator by which it makes in-line condenser Cx(2) that induces the multi-vibrator (3) (4) and by that it gives certain voltage Vi.