JPH07311889A - Gas detector - Google Patents

Abstract

PURPOSE:To provide a gas detector which can be installed at an arbitrary location, regardless of the location of a plug socket for a commercial power source. CONSTITUTION:A solar battery 11 generates electric power by the illumination of solar light, household electric lights or fluorescent lamps. The voltage of the generated electric power is stabilized by a Zener diode 12 and a capacitor 13 for voltage stabilization and the power is supplied to a gas detection sensor 14 and an alarm circuit 15. A gas detection sensor 14 outputs the detection output changing according to the density of gas to the alarm circuit 15. When the alarm circuit 15 judges that the gas density corresponding to the detection output of the gas detection sensor 14 exceeds a prescribed value to be judged as a gas leakage, the circuit gives an alarm with a buzzer and a lamp, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas detector for detecting gas leaks, alarms and the like.

[0002]

2. Description of the Related Art FIG. 3 is a circuit diagram showing a schematic configuration of a conventional gas detector. This gas detector is connected to a commercial power source 51 of 100V, and a power source circuit 52 for transforming or rectifying.
And a gas detection sensor 53 and an alarm circuit 54 to which power is supplied from the power supply circuit 52. Alarm circuit 5
Reference numeral 4 inputs the detection output of the gas detection sensor 53, and when it determines that the gas concentration exceeds a predetermined value which is determined to be a gas leak, an alarm is issued by a buzzer or a lamp.

[0003]

As shown in FIG. 3, the conventional gas detector uses the commercial power source 51 as a power source, so that the gas detector is installed at a place where an outlet for the commercial power source is provided. There was a problem that it was limited. In addition, even if there is an outlet for commercial power supply, if it is far from the optimum place to install the gas detector, it is necessary to extend the power supply line to install the gas detector in the optimum place. There was a problem.

The present invention has been made in view of the above problems, and an object thereof is to provide a gas detector which can be installed at any place regardless of the position of an outlet of a commercial power source. It is in.

[0005]

A gas detector according to claim 1 comprises a gas detection sensor for detecting gas and a solar cell for supplying electric power to the gas detection sensor. It is designed to be supplied by a battery.

A gas detector according to a second aspect is the gas detector according to the first aspect, further comprising a battery for supplying electric power to the gas detection sensor together with the solar cell, and supplying electric power to the gas detection sensor by the solar cell and the battery. It is something that is supplied.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing the configuration of the gas detector of the first embodiment of the present invention. The gas detector of this embodiment includes a solar cell 11, a Zener diode 12 for voltage control connected between both electrodes of the solar cell 11, a capacitor 13 for stabilizing voltage, a gas detection sensor 14, and an alarm circuit 1.
It is equipped with 5.

The solar cell 11 used is one that generates electricity by lighting an electric lamp or a fluorescent lamp. In this case, since the wavelength range of the illumination light of the electric lamp or the fluorescent lamp overlaps with the wavelength range of sunlight, the solar cell 11 also generates power by sunlight. The Zener diode 12 controls the output voltage from the solar cell 11 so as not to exceed a certain value. The condenser 13 stabilizes the voltage by smoothing short-term changes in the input light such as the ripple of the fluorescent lamp. The gas detection sensor 14 is a sensor whose output changes according to the concentration of gas such as city gas or propane gas, and for example, a semiconductor gas sensor is used. The alarm circuit 15 receives the detection output of the gas detection sensor 14 and determines whether or not the gas concentration corresponding to the detection output exceeds a predetermined value that is determined to be a gas leak. It is provided with an alarm means such as a buzzer or a lamp for issuing an alarm by sound or light when it is determined that the concentration exceeds a predetermined value.

Next, the operation of the gas detector of this embodiment will be described.

The solar cell 11 generates power by sunlight, lighting of a domestic electric lamp or fluorescent lamp, and the generated power is a Zener diode 12 and a voltage stabilizing capacitor 1.
The voltage is stabilized by 3 and supplied to the gas detection sensor 14 and the alarm circuit 15. The gas detection sensor 14 outputs a detection output that changes according to the gas concentration to the alarm circuit 15. When the alarm circuit 15 determines that the gas concentration corresponding to the detection output of the gas detection sensor 14 exceeds a predetermined value that is determined to be a gas leak, it issues an alarm with a buzzer, a lamp, or the like.

As described above, according to the gas detector of the present embodiment, the electric power for the gas detection sensor 14 and the alarm circuit 15 is supplied by the solar cell 11 which generates electricity by the lighting of a domestic electric lamp or a fluorescent lamp. Therefore, the gas detector can be installed at any place regardless of the position of the outlet of the commercial power supply. Further, energy saving can be expected because the solar cell 11 that generates electricity by lighting of a domestic electric light or a fluorescent lamp is used.

FIG. 2 is a circuit diagram showing the configuration of the gas detector of the second embodiment of the present invention. In the gas detector of this embodiment,
The anode of the backflow prevention diode 21 is connected to the positive electrode of the solar cell 11. Between the cathode of the diode 21 and the negative electrode of the solar cell 11, the voltage control circuit 22, the battery 2
3, the gas detection sensor 14 and the alarm circuit 15 are connected. The positive electrode of the battery 23 is arranged on the cathode side of the diode 21, and the negative electrode of the battery 23 is arranged on the negative electrode side of the solar cell 11. Backflow prevention diode 2
1 is for preventing a current from flowing backward from the battery 23 to the solar cell 11. The voltage control circuit 22 is
This is to prevent the charging voltage from the solar cell 11 from flowing when the voltage of the battery 23 becomes equal to or higher than the specified voltage to prevent overcharging of the battery 23. Note that, instead of the voltage control circuit 22, a current control circuit may be provided in the subsequent stage of the cathode of the diode 21.

In the gas detector of this embodiment, electric power for the gas detection sensor 14 and the alarm circuit 15 is supplied by the solar cell 11 and the battery 23. Further, the battery 23 is charged by the solar cell 11. Further, when the amount of power generated by the solar cell 11 is small, such as at night, electric power is supplied by the battery 23.

As described above, according to the gas detector of this embodiment, since the solar cell 11 and the battery 23 are used in combination, the gas detector can be reliably operated even when the amount of power generated by the solar cell 11 is small, such as at night. . Other configurations, operations and effects are similar to those of the first embodiment.

[0016]

As described above, according to the gas detector of the first aspect, the electric power for the gas detection sensor is supplied by the solar cell, so that the gas detection is performed regardless of the position of the outlet of the commercial power source. The effect is that the vessel can be installed at any place.

Further, according to the gas detector of the second aspect, the electric power for the gas detection sensor is supplied by the solar cell and the battery. Therefore, even when the amount of power generated by the solar cell is small, for example, at night, the reliability is ensured. There is an effect that can be operated.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a gas detector according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a gas detector according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a schematic configuration of a conventional gas detector.

[Explanation of symbols]

 11 Solar cell 12 Zener diode 13 Capacitor 14 Gas detection sensor 15 Alarm circuit

Claims (2)

[Claims] 1. A gas detector comprising a gas detection sensor for detecting gas and a solar cell for supplying electric power to the gas detection sensor. 2. The gas detector according to claim 1, further comprising a battery that supplies electric power to the gas detection sensor together with the solar cell.