JP2003037515A - Wireless receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery-operated wireless receiver to achieve reduced power consumption. SOLUTION: In the wireless receiver constituted of a wireless transmitter 1 and a wireless receiver 2, power is supplied intermittently to the amplifier 4 of the wireless receiver 2, to reduce the consumed power.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless receiver, and more particularly, to a circuit for reducing power consumption of a battery-operated wireless receiver. 2. Description of the Related Art A conventional radio receiving apparatus using a battery is:
In order to reduce power consumption, radio waves received by the antenna were not amplified but detected directly. Alternatively, radio waves received by an antenna were constantly amplified and detected. [0003] However, according to the conventional radio receiving apparatus which does not amplify the radio wave received by the antenna and detects the radio wave as it is, when the transmission power becomes weak, the detection of the signal becomes impossible. In a wireless receiving apparatus that can always amplify a radio wave received by an antenna, the power consumption is increased and the use of a battery is difficult because the wireless receiver always amplifies the radio wave. In view of these problems, an object of the present invention is to provide a wireless receiver capable of amplifying radio waves received by an antenna with low power consumption. [0004] In order to solve the above-mentioned problems, the invention of claim 1 includes a wireless transmission unit and a wireless reception unit, and transmits a weak radio wave from the wireless transmission unit. In the wireless receiving device for operating the wireless receiving unit, the wireless transmitting unit is provided with an operation switch, and is configured to transmit a signal a plurality of times within a certain time when the operation switch is operated. And, the wireless receiving unit,
A signal generation unit that periodically generates a pulse signal, and an intermittent power supply unit that is turned on only when a pulse signal is received from the signal generation unit are provided, and the pulse generation cycle of the signal generation unit is The signal transmission unit is configured to have a shorter pulse transmission time than the wireless transmission unit and a longer pulse signal of the signal generation unit than a signal transmitted from the wireless transmission unit. An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of an embodiment, FIG. 2 is a circuit block diagram of a wireless receiver, and FIG. 3 is a timing chart of an output signal of a wireless transmitter and a pulse waveform of a signal generating circuit of the wireless receiver. As shown in FIG. 2, a signal transmitted from the wireless transmission unit 1 is taken in by an antenna 3, a small signal is amplified by an amplification unit 4 and transmitted to a detection unit 5. The detected signal is transmitted to the data processing unit 6, where the signal from the wireless transmission unit 1 is demodulated and, if necessary, converted into a signal for outputting an alarm sound or a melody from the speaker 7. On the other hand, the amplifying unit 4 supplies power from an intermittent power supply unit 9 which is turned on / off in synchronization with a pulse signal 12 as shown in FIG. Is provided. The timing of signals from the wireless transmitter 1 and the wireless receiver 2 at this time will be described in detail with reference to FIG. The signal from the wireless transmitter 1 transmits a plurality of signals 11a, 11b,... 11n at a predetermined time T.
Each of the signals includes the ID code of the wireless transmitter 1, an alarm sound or a melody sub-ID code, and even one of the plurality of transmitted signals is detected by the wireless receiver 2. For example, an alarm sound or a melody is output from the speaker 7. The pulse signal 12 periodically output from the signal generation unit 8 of the wireless receiver 2 controls the intermittent power supply unit 9, and when the pulse signal 12 is ON, turns on the intermittent power supply unit 9 and outputs the pulse signal. 12 is OF
At the time of F, the intermittent power supply unit 9 is turned off and the power supply to the amplifying unit 4 is turned on / off. The generation cycle T1 of the pulse signal 12 is set shorter than a predetermined time T during which a signal from the wireless transmitter 1 is output. In this embodiment, the pulse signal 12 is generated twice with respect to the time T. It is configured. The length T2 of the pulse signal 12 output from the signal generator 8 of the wireless receiver 2 is set longer than the length of the signal from the wireless transmitter. Finally, at least two signals from the wireless transmitter 1 are synchronized. As a result, in this embodiment, the wireless transmitter 1
A signal transmitted once from the wireless receiver is received by the wireless receiver T
Within the time, the signal generator 8 of the wireless receiver 2 always outputs the pulse signal 12 twice regardless of the reception timing, and the two pulse signals 12 are output from the signal generator 8. In the meantime, as described above, four of the signals from the wireless transmitter 1 are synchronized with the timing at which the amplifying unit 4 is turned on and amplified, and the signal can be reliably detected, and the alarm can be performed. Voices and melodies are output. As described above, by intermittently supplying power to the amplifying unit 4, power consumption can be suppressed, and a signal from the wireless transmitter 1 and a pulse from the signal generating unit 8 of the wireless receiving device 2 can be reduced. By setting the timing of the signal 12 as described above, it is possible to amplify the received signal reliably even asynchronously. For example, the intermittent power supply unit may be a switching circuit using a transistor. Can be realized, and the battery life of the battery-powered wireless receiving device can be extended. The battery life of the conventional system and that of this embodiment using an alkaline dry battery were compared. Batteries are used at 3V by connecting two AAA batteries in series. The usage condition is that, in the conventional method, the amplification unit is turned on for 24 hours, and the operation switch of the wireless transmitter is turned on 20 times a day. In this embodiment, the amplifying unit is turned on / off intermittently for 24 hours, and the operation switch of the wireless transmitter is turned on 20 times a day. From this result and the load characteristics of the dry cell, the calculation in which the conventional method in which the amplification unit is kept ON is approximately 17 days, and the calculation in which the amplification unit is intermittently turned ON / OFF is approximately 365 days. It is clear. It should be noted that the present invention is not limited to the above embodiment, and may be implemented by appropriately changing the generation cycle, length, and circuit configuration of the pulse signal without departing from the spirit of the present invention. . As described above in detail, according to the first aspect of the present invention, a wireless transmission unit and a wireless reception unit are provided, and a weak radio wave is transmitted from the wireless transmission unit. In a wireless receiving device that operates a wireless receiving unit, the wireless transmitting unit is provided with an operation switch, and when the operation switch is operated, within a certain time, is configured to transmit a signal a plurality of times, The wireless receiver includes a signal generator that periodically generates a pulse signal, and an intermittent power supply that turns on only when a pulse signal is received from the signal generator. The generation cycle of the pulse signal of the generation unit is shorter than the time when the signal is transmitted from the wireless transmission unit, and the length of the pulse signal of the signal generation unit is such that the signal is transmitted from the wireless transmission unit. Longer than the signal With such a configuration, the power consumption is reduced and the battery life is extended with a simple circuit.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a perspective view of the present embodiment. FIG. 2 shows a circuit block of a wireless receiver. FIG. 3 shows a timing diagram of an output signal of a wireless transmitter and a pulse signal from a signal generator of a wireless receiver. [Explanation of Reference Codes] 1 ... wireless transmission section, 2 ... wireless reception section, 3 ... antenna
4 amplifying section, 5 detecting section, 6 data processing section, 7 speaker, 8 signal generating section, 9 intermittent power supply section, 10
... Dry batteries, 11a, 11b ... 11n ... Output signal of wireless transmitter, 12 ... Pulse signal of signal generator, 21 ...
Pilot lamp of wireless receiving unit, 22: pilot lamp of wireless transmitting device, 23: operation switch, T: time for output signal of wireless transmitter, T1: cycle of pulse signal, T2: length of pulse signal

Claims (1)

Claims: 1. A wireless receiving device comprising a wireless transmitter and a wireless receiver, transmitting a weak radio wave from the wireless transmitter and operating the wireless receiver. The wireless transmission unit is provided with an operation switch, is configured to transmit a signal a plurality of times within a certain time when the operation switch is operated, and the wireless reception unit periodically pulse A signal generation unit for generating a signal, and an intermittent power supply unit that is turned on only when a pulse signal is received from the signal generation unit are provided, and the generation cycle of the pulse signal of the signal generation unit is the wireless type. The pulse signal of the signal generating unit is configured to be shorter than a time period in which a signal is transmitted from a transmission unit, and to be longer than a signal signal transmitted from the wireless transmission unit. Wireless receiver Communication device.