JPS6326933B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a super-regenerative front end that converts received input from an antenna into a low-frequency signal, and an amplifier, a bandpass filter, and a signal processing circuit that converts the output of the super-regenerative front end into a low-frequency signal. and an acoustic output circuit controlled by the signal obtained through the switching circuit, and the minimum operating voltage of the super regenerative front end is higher than the minimum operating voltage of the amplifier, bandpass filter, signal processing circuit, switching circuit, etc. At the same time, the minimum operating voltage of the acoustic output circuit is lower than the minimum operating voltage of the amplifier, bandpass filter, signal processing circuit, switching circuit, etc., and the operation of the quenching oscillation circuit installed in the front end of the super regeneration method is stopped. When the oscillation output is detected by the detection circuit and the oscillation output stops, the front end power supply voltage automatic adjustment circuit, which operates based on the output of the oscillation stop detection circuit, increases the power supply voltage of the super regeneration front end and also adjusts the output of the oscillation stop detection circuit. This invention relates to a dead battery notification device for a dry battery-powered wireless chain, characterized in that the sound output circuit is controlled by the output of the front-end power supply voltage automatic adjustment circuit to issue a power failure warning sound. .

SUMMARY OF THE INVENTION An object of the present invention is to be able to reliably notify a dead battery, thereby preventing false alarms due to a dead battery, and to also be able to notify that a receiving function has stopped due to a tuning shift in a quenching oscillation circuit.

As shown in Figure 1, the conventional battery-powered wireless team uses a super regenerative front end (hereinafter abbreviated as front end) to receive input from antenna 1.
2, the output is amplified by an amplifier 3, noise is removed by a bandpass filter 4, and an acoustic output circuit 7 is controlled through a signal processing circuit 5 and a switching circuit 6 to produce a speaker 8. I was trying to give more information. 9 is a dry battery for power supply. In this case, the sound output circuit 7 is used for generating a chime sound that has a power outage notification function.
When using the IC (DN825), only the acoustic output circuit 7 detects the dead battery, and the previous stage circuit detects the battery exhaustion.
It has the disadvantage that an alarm will be lost if the operation malfunctions at a higher voltage.Also, the battery exhaustion alarm will not notify unless a signal is received and the acoustic output circuit 7 does not operate. Since it does not notify when the signal is out, it has the disadvantage that it becomes unable to receive the signal while waiting for the signal. Furthermore, as shown in FIG. 2, there is a low-battery notification device in which a series circuit of a check button 10, a Zener diode 11, and a light-emitting diode 12 is connected to the power supply side of a receiver A that does not have a low-battery notification function. However, this method has the disadvantage that it cannot be determined unless the check button 10 is pressed.

The present invention has been made in view of this point, and will be explained in detail below with reference to Examples.

In Fig. 3, 1 is an antenna, 2 is a front end, 3 is an amplifier, 4 is a bandpass filter,
5 is a signal processing circuit, 6 is a switching circuit, 7 is an audio output circuit, 8 is a speaker, and 9 is a dry battery. For example, the minimum operating voltage of the front end 2 is 4V, and the amplifier 3, bandpass filter 4,
The minimum operating voltage of the signal processing circuit 5 and the switching circuit 6 is set to 3V, and the minimum operating voltage of the audio output circuit 7 is set to 1.5V. Front end 2 is the fourth
As shown in the block circuit diagram shown in the figure or the specific circuit diagram shown in FIG. The signal is amplified by the amplifier 13, mixed with the quenching output voltage by the quenching oscillation circuit 14, and outputted as a low frequency signal by the low pass filter 15, which is input to the amplifier 3. Reference numeral 16 denotes an oscillation stop detection circuit, the output of which becomes H level when the quenching oscillation circuit 14 stops oscillating. 17 is a front-end power supply voltage automatic adjustment circuit formed by the CPU, which is operated by the output of the oscillation stop detection circuit 16, and outputs 0 ₁ to 0 ₄ are stopped when the quenching oscillation circuit 14 stops oscillating due to a drop in the power supply voltage. In the end, everything becomes H level. 18 is a NAND gate, and 19 is an inverter, which inputs the outputs of the front-end power supply voltage automatic adjustment circuit 17 and the oscillation stop detection circuit 16, respectively, and inputs these outputs to the audio output circuit 7 via the NOR gate 20 to output audio. The output circuit 7 is controlled.

Now, if the voltage of the dry battery 9 is higher than the minimum operating voltage of the front end 2, the reception input from the antenna 1 is converted into a low frequency signal at the front end 2, and this low frequency signal is amplified by the amplifier 3. After noise is removed by a bandpass filter 4, an audio output circuit 7 is controlled through a signal processing circuit 5 and a switching circuit 6, and a sound is output from a speaker 8. At this time, the output ₀₁ of the front-end power supply voltage automatic adjustment circuit 17 is at H level. Next, when the voltage of the dry battery 9 decreases and the voltage applied to the front end 2 becomes below the minimum operating voltage, the quenching oscillation circuit 14 stops oscillating.
The output of the oscillation stop detection circuit 16 becomes H level,
The output 0 ₂ of the front end power supply voltage automatic adjustment circuit 17 becomes H level, reduces the voltage drop of the transistor Q, increases the voltage applied to the front end 2, and puts the front end 2 into an operating state. If the voltage of the dry battery 9 further decreases in this state, the voltage drop of the transistor Q is reduced by the output of the front end power supply voltage automatic adjustment circuit 17.
And front end power supply voltage automatic adjustment circuit 17
When all of the outputs 0 ₁ to 0 ₄ become H level,
The output of NAND gate 18 becomes L level,
When the output of the NOR gate 20 changes from the L level to the H level, the sound output circuit 7 is controlled to issue a low battery notification sound.

As described above, the present invention makes the minimum operating voltage of the super-regeneration system front higher than the minimum operating voltage of the amplifier, bandpass filter, signal processing circuit, switching circuit, etc., and increases the minimum operating voltage of the acoustic output circuit. It is lower than the minimum operating voltage of the filter, bandpass filter, signal processing circuit, switching circuit, etc., and is installed in the front end of the super regeneration method.The operation of the quenching oscillation circuit is detected by the oscillation stop detection circuit.
When the oscillation output stops, the front-end power supply voltage automatic adjustment circuit, which operates based on the output of the oscillation stop detection circuit, increases the power supply voltage of the super regenerative front end, and also automatically adjusts the front-end power supply voltage with the output of the oscillation stop detection circuit. Since the acoustic output circuit is controlled by the output of the circuit to notify the battery exhaustion alarm sound, the battery exhaustion alarm can be reliably notified and false alarms due to the battery exhaustion can be prevented, and reception caused by out-of-tuning of the quenching oscillator circuit can be prevented. This has the effect of also being able to notify of a functional outage.

[Brief explanation of drawings]

Fig. 1 is a block circuit diagram of a conventional dry battery-powered wireless chain, Fig. 2 is a circuit diagram of an example of a conventional battery-out alarm device, and Fig. 3 is a dry-battery-powered wireless channel equipped with the battery-out alarm device of the present invention. FIG. 4 is a block circuit diagram of a super-regenerative front end used in the above, and FIG. 5 is a specific circuit diagram of the same. DESCRIPTION OF SYMBOLS 1... Antenna, 2... Super regeneration front end, 3... Amplifier, 4... Band pass filter, 5... Signal processing circuit, 6... Switching circuit, 7... Sound output circuit, 14... ...Quenching oscillation circuit, 16...Oscillation stop detection circuit, 17...
Front-end power supply voltage automatic adjustment circuit.

Claims (1)

[Claims] 1 A super-regenerative front end that converts the received input from an antenna into a low-frequency signal, and an output of the super-regenerative front end that is controlled by a signal obtained through an amplifier, a bandpass filter, a signal processing circuit, and a switching circuit. It is equipped with an acoustic output circuit that makes the minimum operating voltage of the super regenerative front end higher than the minimum operating voltage of amplifiers, bandpass filters, signal processing circuits, switching circuits, etc., and also lowers the minimum operating voltage of the acoustic output circuit. The quenching oscillation circuit is lower than the minimum operating voltage of amplifiers, bandpass filters, signal processing circuits, switching circuits, etc., and is installed in the front end of the super regeneration system.The oscillation stop detection circuit detects the operation of the quenching oscillation circuit, and the oscillation output stops. When this happens, the front-end power supply voltage automatic adjustment circuit operated by the output of the oscillation stop detection circuit increases the power supply voltage of the super regeneration front end, and the output of the oscillation stop detection circuit and the output of the front-end power supply voltage automatic adjustment circuit are 1. A battery-depletion notification device for a dry battery-powered wireless chain, characterized in that the sound output circuit is controlled by the controller to issue a power-out notification sound.