RU145404U1 - SIGNAL DEVICE FOR FINDING A LOST ITEM - Google Patents

Abstract

A signal device for searching for a lost item containing a battery, a receiving antenna connected in series, an input RF amplifier, a rectangular pulse shaper, a coded pulse sequence decoder / analyzer, an audio indicator, characterized in that a field key is inserted in series with the battery in the electronic circuit transistor with the ability to automatically turn on and off the supply voltage of the device by applying a control voltage to the gate transistor, and the input radio frequency amplifier and square-wave pulse generator are made according to the scheme with a small working current with the possibility of locking them with a control voltage.

Description

The utility model relates to signaling devices or call devices and can be used to search for lost items, such as a remote control for a TV or air conditioner.

From the prior art, a signal device is known intended for the automated search for a television control panel, video, audio and other household and electronic equipment containing a resonant circuit, an amplifier, a detector and an audible warning device located on the control panel, as well as a square-wave pulse generator and generator " packs "included in the electrical circuit of the power button electronic devices; the device can also work from a separate button (RF patent for the invention No. 224342, IPC G08B 21/24, published January 10, 2005). The search is carried out by pressing the power button of the electronic device, while the signaling unit emits electromagnetic pulses, which are received by the resonant circuit, amplified by the amplifier, rectified by the detector and fed to the sound signaling device.

The disadvantage of this technical solution is the rapid discharge of the battery power supply unit of the alarm unit, mounted on the remote control, since the active elements of the alarm unit are constantly in working condition and consume electrical energy. An audio signal is emitted each time the electronic device is turned on, including when the remote control is not required, since the pulse generator and the generator of the "packs" of the transmitting unit are started when you press the power button of the electronic device. The warning signal is absent when the remote control is located less than 0.5 m from the electronic device (for example, the remote control is located behind the device), because if there is an inductive coupling between the transceiver antenna and the resonant circuit, the sound indicator is turned off. With a sufficiently close arrangement of several electronic devices (for example, in neighboring rooms) equipped with the indicated devices, an audio signal is turned on at each of them when any electronic device is turned on, since the known device is not selective.

Also known is a dual system for searching for lost items, using, as one of the options, transmitting a search signal using electromagnetic waves, consisting of two identical devices placed on different items, for example, on the TV remote control and keychain. Each device of the system consists of a signal button, a radio frequency transceiver with an antenna, a microprocessor that processes the input data, generates output signals and consumes a small amount of electricity from the batteries in standby mode, and when an input signal is received or when the button that goes into active mode is pressed, a sound emitter, LED, two batteries to power the electronic circuit. If an item is lost with the first device attached to it, the search is carried out by pressing a button on the second device attached to another object. The search signal is transmitted in the form of a coded sequence of electromagnetic pulses and is individual for each pair of devices. A device mounted on a lost item responds with a sound and light signal. A well-known technical solution provides the search for lost things by transmitting and receiving a search signal in the form of electromagnetic waves (US patent for the invention No. 6366202, IPC G08B 1/08, published 02.04.2002).

The disadvantage of this technical solution is that the input amplifier, output amplifier, comparator and frequency divider having active components are constantly in active mode, while consuming a sufficiently large amount of energy, which reduces the battery life and requires frequent replacement.

It is also known a device for searching for a remote control, comprising a transmitter installed inside the television, the power control button of which is placed on the front of the television, consisting of a shaper of an RF coded search signal, a transmitting element and a receiver installed in the remote control, consisting of a receiving element, a decoder RF coded signal analyzer, sound indicator. The input of the shaper of the radio-frequency encoded search signal is connected to the control button for turning on the transmitter, and the output to the transmitting element. The input of the decoder-analyzer of the radio-frequency encoded signal is connected to the receiving element, and the output to the sound indicator. The device can be used when conducting a wireless search for the TV remote control (RF patent for utility model No. 112444, IPC G01S 1/00, published January 10, 2012). This technical solution is the closest to the claimed technical solution and is taken as a prototype of the claimed utility model.

The disadvantage of this technical solution is that the active components of the electronic circuitry of the receiver are constantly in operation, while consuming a significant amount of energy, which reduces the battery life and requires frequent replacement.

The task to which the claimed utility model is directed is to create a signal device to search for a lost item that consumes less energy from power batteries, which allows to increase their service life and use batteries with lower energy consumption.

The solution to this problem is achieved by the fact that in the claimed utility model, which consists of a transmitter containing a battery, a signal button, a coded pulse train, a radio frequency modulator, an output radio frequency amplifier, a transmitting antenna and a receiver containing a battery, are connected in series receiving antenna, input radio frequency amplifier, square-wave pulse generator, decoder-analyzer coded sequentially these pulses, an audio indicator, in contrast to the prototype, a key on a field-effect transistor is introduced in series with the batteries in the transmitter’s electronic circuitry with the ability to automatically turn on and off the transmitter’s supply voltage by supplying a control voltage to the transistor’s gate, and in the receiver’s electronic circuitry in series with the batteries A key has been introduced on a field-effect transistor with the ability to automatically turn on and off the receiver's supply voltage by supplying a control voltage to the gate transistor, the input RF amplifier and shaper rectangular pulse formed on the circuit with a small operating current with the possibility of locking the control voltage.

The technical result provided by the above set of features is to increase the battery life of the transmitter and receiver.

The longer battery life of the transmitter is achieved by the fact that the transmitter is on only for 5852 ms after pressing the signal button, and in standby mode, in which the transmitter is located most of the time, is turned off and does not consume electrical energy.

The longer battery life of the receiver is achieved by the fact that the receiver, in the absence of an input signal, is in the on state for only 20 ms in a time interval of 5000 ms, and in standby mode it is turned off and does not consume electrical energy. In addition, the input RF amplifier and the square-wave pulse generator are designed according to the scheme with a low operating current and consume a small amount of energy from the power battery when turned on. Also, the decoder-analyzer of the coded pulse sequence, in the absence of an input signal, is in sleep mode with a low current consumption, and during the emission of an audio signal, the input RF amplifier and the square-wave driver are locked by the control voltage.

The essence of the utility model is illustrated by drawings, where in FIG. 1 is a block diagram of a transmitter; FIG. 2 is a block diagram of a receiver, in FIG. 3 - pulse sequence generated by the encoder encoder sequence of pulses.

The signal device for searching for a lost item consists of a transmitter that is constantly in an accessible place, for example, attached with tape on the TV and a receiver attached to a frequently lost item, for example, on a TV remote control.

The transmitter (Fig. 1) contains a power battery 1 (type 23A, 6 V) connected to the electronic circuit of the transmitter through the key on the field effect transistor 2, a signal button 3 with self-resetting and a capacitor 4 included in the key gate circuit on the field effect transistor 2, the driver encoded pulse sequence 5 (or microcontroller 5), which is an ATtiny13A Atmel type microcontroller, a Zener diode 6, which sets the supply voltage level of the microcontroller 5, a capacitor fast discharge unit 7, the input of which is connected to one of the control leads 5 rows microcontroller, radio frequency oscillator 8, a modulator, a modulating input coupled to the signal output of the microcontroller 5, the output of the RF amplifier 9, whose input is connected to the output radiofrequency generator-modulator, a transmitting antenna 10 connected to the output of RF amplifier 9 output.

The receiver (Fig. 2) contains a power battery 11 (two batteries of the CR2032 type, 3 V) connected to the electronic circuit of the receiver through a key on a field effect transistor 12, a resistor 13 and a capacitor 14 included in the key gate circuit on the field effect transistor 12, a receive antenna 15 connected to the input of the input RF amplifier 16, the output of which is connected to the square-wave pulse former 17, a decoder-analyzer of the encoded pulse train 18 (microcontroller 18), which is an ATtiny13A Atmel microcontroller, a fast discharge unit 19 a condenser having an input connected to one of the control pins of the microcontroller 18, audible indicator 20, which is a piezoelectric sound transducer that is connected directly to the signal terminal of the microcontroller 18.

The transmitter (Fig. 1) operates as follows. When the signal button 3 is short-circuited, the capacitor 4 is quickly charged. The voltage on the capacitor opens the key on the field-effect transistor 2, the transmitter receives the voltage from the power supply battery 1 and the transmitter switches to the on state. The supply voltage of the microcontroller 5 is set by the zener diode 6. The low voltage level from the control terminal PB2 of the microcontroller 5 is supplied to the input of the capacitor fast discharge unit 7, keeping the bipolar npn transistor closed, therefore, the discharge of the capacitor 4 practically does not occur, which ensures the key is maintained on the field-effect transistor 2 in the open state and the operation of the transmitter. At the signal terminal PB1 of the microcontroller 5, a pulse train shown in FIG. 3. The first pulse 21 of a high level, lasting 6 ms, is designed to create an interrupt signal and output the microcontroller 18 (Fig. 2) of the receiver from sleep mode. This is followed by a pause 22 of 4 ms duration, designed to enable the microcontroller 18 of the receiver to enter the operating mode for receiving a start pulse. Then follows a high-level start pulse 23, upon detection of which the receiver microcontroller 18 is ready to receive and decode the byte of the encoded pulse sequence. Then the byte of the encoded pulse train 24 is transmitted (individual for each device). The duration of the start pulse and code pulses is 0.1 ms. This is followed by a pause of 25 for 10 ms and a periodic repetition of the transmission of the specified encoded pulse sequence. This coded pulse sequence is fed to the modulating input of the radio frequency modulator 8 (Fig. 1), where the carrier frequency 433.92 MHz is modulated by the generated coded pulse sequence. The modulated signals are amplified by the output RF amplifier 9 (FIG. 1) and emitted by the transmitting antenna 10 (FIG. 1). 5852 ms after switching on, the microcontroller 5 (Fig. 1) generates a high level voltage at the control terminal PB2, which opens the bipolar transistor of the fast capacitor discharge unit 7, which causes the discharge of the capacitor 4, closes the key on the field effect transistor 2 and turns off the transmitter supply voltage. Thus, during a transmitter operating time of 5852 ms, the encoded pulse train is transmitted 280 times.

The receiver (Fig. 2) works as follows. A key in the power supply circuit 11 of the key on the field-effect transistor 12 is opened by an increasing voltage on the capacitor 14 charged through the resistor 13, which provides a supply voltage to the receiver electronic circuit and its inclusion, while the microcontroller 18 is turned on when it is turned on, with the timer running from which it can be put into operation by an external interrupt pulse. In the absence of a search signal, the microcontroller 18 in 20 ms generates a high level voltage at the control terminal PB2, which opens the bipolar transistor of the capacitor fast discharge section 19, which causes the discharge of the capacitor 14, closes the key on the field effect transistor 12, and disconnects the supply voltage of the receiver. Then, the voltage across the capacitor 14, charged through the resistor 13, begins to increase again, which leads to the opening of the key on the field-effect transistor 12 after a time interval of 5000 ms, determined by the value of the time constant RC. Thus, the receiver circuitry is on for 20 ms every 5000 ms, i.e. 0.4% of the time, consuming the minimum amount of energy from the power battery 11. If there is a search signal, the pulses transmitted by the transmitter are received by the receiving antenna 15 of the receiver, amplified by the input radio frequency amplifier 16 and fed to the square-wave pulse generator 17, where the pulses are detected, as well as the formation of the amplitude and steepness of the fronts. Then the pulses are fed to the microcontroller 18. A high-level pulse 21 (Fig. 3) of 6 ms duration interrupts the sleeping state of the microcontroller 18 (Fig. 2) and puts it into operation. Turning on the receiver for 20 ms every 5000 ms ensures that the receiver is in the on state in the time interval when the transmission of the interrupt pulse 21 (Fig. 3) by the transmitter occurs. Upon detection of the start pulse 23, the microcontroller 18 (Fig. 2) receives the subsequent byte of code 24 (Fig. 3) and decodes it, comparing it with the code recorded in the permanent memory of the microcontroller 18 (Fig. 2). If the code is defined, the microcontroller 18 generates sound frequency pulses on the signal output PB1, which are fed to the sound indicator 20, which emits a clearly distinguishable loud intermittent sound. At the same time, the microcontroller 18 generates a low level voltage on the control terminal PB0, which is supplied to the control terminals of the input radio frequency amplifier 16 and the rectangular pulse shaper 17, locking them and putting them into low current consumption mode. The sound frequency pulses are transmitted to the sound indicator 20 for 10 seconds, after which the microcontroller 18 generates a high level voltage at the control terminal PB2, which opens the bipolar transistor of the fast discharge unit of the capacitor 19, which causes a fast discharge of the capacitor 14, closing the key on the field effect transistor 12 and power off the receiver.

Claims (1)

A signal device for searching for a lost item containing a battery, a receiving antenna connected in series, an input RF amplifier, a rectangular pulse shaper, a coded pulse sequence decoder / analyzer, an audio indicator, characterized in that a field key is inserted in series with the battery in the electronic circuit transistor with the ability to automatically turn on and off the supply voltage of the device by applying a control voltage to the gate transistor, and the input radio frequency amplifier and square-wave pulse generator are made according to the scheme with a small working current with the possibility of locking them with a control voltage.