JPH0158738B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas leak detection sensor power supply device that supplies power to a gas leak detection sensor whose power consumption during a preheating period immediately after power is turned on is greater than power consumption in a standby state after preheating is completed. It is something.

FIG. 1 shows the load characteristics of the gas leak detection sensor. As shown in the diagram, this gas leak detection sensor consumes a large amount of power for preheating for 2 to 3 minutes immediately after the power is turned on, and when the temperature rises enough to complete preheating and enter the standby state, the power consumption automatically increases. is now being suppressed. Such gas leak detection sensors normally operate on commercial AC power, but they also need to operate in case of commercial AC power outages. In addition, a power supply device for power supply to a gas leak detection sensor is required, which has a power outage compensation function and can supply the same voltage.

In order to supply power to the gas leak detection sensor, the gas leak detection sensor power supply device has a capacity that can cover the power consumption during preheating of the gas leak detection sensor even in the event of a power outage of the commercial AC power supply. Therefore, there were problems of high cost and large size.

On the other hand, if the capacity of the power supply device for supplying power to the gas leak detection sensor during a power outage of the commercial AC power supply is made small enough to cover the standby power consumption of the gas leak detection sensor, it can be made cheaper and smaller. However, there is a problem in that the drooping characteristic acts on the power consumption during preheating of the gas leak detection sensor, resulting in a drop in the output voltage, causing the gas leak detection sensor to malfunction.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a power supply device for power supplying a gas leak detection sensor that can prevent malfunction of the gas leak detection sensor, and that can be made inexpensive and compact.

An embodiment of this invention is shown in FIG. In other words, this gas leak detection sensor power supply power supply device supplies power to a gas leak detection sensor whose power consumption during the preheating period immediately after the power is turned on is higher than the power consumption in the standby state after preheating is completed. A 60 Hz commercial AC power source E that is a power supply device and constantly supplies power to the gas leak detection sensor, and a constant voltage charging circuit CG that is constantly supplied with power from this commercial AC power source E.
An emergency power source BT consisting of a storage battery that is constantly charged by this constant voltage charging circuit CG, and this emergency power source
an inverter body IN that is powered by BT and operates to supply power to the gas leak detection sensor at the same voltage and frequency as the commercial AC power source; A relay RY ₁ for detecting a commercial power outage that supplies power to the inverter main body IN, and a timer that prevents the operation of the inverter main body IN for a fixed period of time after turning on the commercial AC power source E until preheating of the gas leak detection sensor is completed. A circuit (constituting an inverter operation blocking means) TM. In this case, the inverter body IN uses the 60Hz excitation signal given from the inverter gate circuit IG to activate the thyristors SCR ₁ ,
Transformer by alternately conducting SCR ₂
TR ₂ is excited at 60Hz, and AC output is taken out from the secondary winding of this transformer TR ₂ .

To explain in more detail, in this gas leak detection sensor power supply device, when the commercial AC power supply E is turned on, the voltage of the commercial AC power supply E is changed to the transformer _TR1 .
After the voltage is stepped down and full-wave rectified by the bridge rectifier SI, it is applied to the constant voltage charging circuit CG, and the output current of this constant voltage charging circuit CG charges the storage battery that is the emergency power source BT.

On the other hand, when the commercial AC power supply E is turned on, the commercial power failure detection relay RY ₁ is energized, and the normally open contacts RY _1a ,
When ry _1b closes, normally closed contacts ry _1c and ry _1b open. By closing the normally open contact RY _1a , the commercial power output switching relay RY ₂ is energized, and the normally open contacts RY _2a ,
When ry _2b closes, normally closed contact ry _2c opens,
Closing of normally open contacts ry _2a and ry _2b opens output terminals T ₁ and T ₂
In the meantime, the voltage of the commercial AC power supply E appears and supplies power to the gas leak detection sensor.

Closing of the normally open contact ry _1b starts the timer operation of the timer circuit TM (setting time is 5 minutes), and the timer contact tm remains open within the timer time. Further, by closing the normally open contact ry _1b , the self-holding auxiliary relay RY ₃ is also energized, and the normally open contact ry _3a is closed. During the above timer time, the inverter itself
Since the IN operation is blocked, even if there is a power outage to the commercial AC power supply E within the timer time, the inverter main unit
doesn't work. Therefore, even if the commercial AC power supply E is interrupted during the preheating period of the gas leak detection sensor,
No current will be supplied from the inverter main body IN, and the gas leak detection sensor will stop operating.

After the above timer time elapses, the timer contact tm switches from the open state to the closed state, and the timer circuit
The state in which the operation of the inverter main body IN is inhibited by TM is released, and the inverter main body IN can be operated during a power outage of the commercial AC power supply E. However, since the normally closed contact RY _1d is open at this time, the inverter input relay RY ₄ is not energized, so the normally open contact
ry _4a does not close, power is not supplied to the inverter main body IN and inverter gate circuit IG, and the inverter main body IN does not operate.

After that, when the commercial AC power supply E experiences a power outage, the excitation of the commercial power outage detection relay RY ₁ stops, and the normally open contact
When ry _1a and ry _1b open, normally closed contacts ry _1c and ry _1d open.
is closed, commercial power output relay RY ₂ stops excitation, normally open contacts RY _2a and RY _2b are opened, and normally closed contact RY _2c (for electrical interlock) is closed.
The power supply to the gas leak detection sensor suddenly stops.

By closing the normally closed contact RY _1d , the inverter input throw relay RY ₄ is energized, the normally open contact RY _4a is closed, and power supply from the emergency power supply BT to the inverter main body IN and the inverter gate circuit IG is started. ,
Inverter main body IN and inverter gate circuit
By starting power supply to IG, inverter gate circuit
A gate signal for oscillation is given from IG to the inverter body IN, and an AC voltage with the same frequency as the commercial AC power supply E appears at the output end of the inverter body IN. When this voltage becomes normal (the voltage of the commercial AC power supply E The inverter output voltage detection relay RY ₅ is energized by the same voltage as RY 5, the normally open contact RY _5a is closed, the normally closed contact RY _5b is opened, and the closing of the normally open contact RY _5a activates the inverter output switching relay. RY ₆ is energized, normally open contacts ry _6a and ry _6b are closed, and normally closed contact ry _6c is opened. By opening these normally open contacts ry _{6a and} ry _6c , the inverter body is connected between the output terminals T ₁ and T _2.
AC voltage from IN appears and restarts power supply to the gas leak detection sensor.

Note that the timer circuit TM does not operate as an auxiliary relay even if the normally open contact RY _1b of the commercial power failure detection relay RY ₁ is opened.
Due to the self-holding operation of RY ₃ , time-up condition,
That is, the closed state of the timer contact tm continues.

By continuing to supply power from the inverter main body IN to the gas leak detection sensor for a long time, the emergency power supply BT
When the voltage of the storage battery falls below the specified voltage, the overdischarge prevention relay RY ₇ is energized, the normally closed contact RY _7a is opened, the self-holding of the auxiliary relay RY ₃ is released, and the timer circuit TM is energized. The timer contact tm opens and the relay for inverter input is turned on.
The excitation of RY ₄ is stopped, the normally open contact RY _4a is opened, and the power supply from the emergency power supply BT to the inverter main body IN and the inverter gate circuit IG is stopped, thereby preventing over-discharge of the emergency power supply BT. As a result, the output voltage of the inverter main body IN disappears, and the excitation of relay RY ₅ for inverter output voltage detection stops and the normally open contact
When ry _5a opens, normally closed contact ry _5b closes,
The excitation of relay RY ₆ for turning on the inverter output stops, normally open contacts RY _6a and RY _6b open, and normally closed contact RY _6c (for electrical interlock) closes, supplying power to the gas leak detection sensor. Stop.

Afterwards, when the power outage of commercial AC power supply E is restored,
Charging of the storage battery, which is the emergency power supply BT, is restarted, the over-discharge prevention relay RY ₇ is deenergized, the normally open contact RY _7a is closed, and the commercial power failure detection relay RY ₁ is energized and the commercial AC is switched on. Repeat the operation immediately after turning on the power E.

In addition, when the commercial AC power supply E is restored while the storage battery that is the emergency power supply BT has sufficient capacity remaining, the overdischarge prevention relay RY ₇ will not operate.
The timer circuit TM is in a time-up state (timer contact
(closed state of TM) and repeats the operation after timer time TM times up.

In addition, before turning on the commercial AC power supply E, output terminals T ₁ ,
When a gas leak detection sensor is connected to T ₂ ,
Commercial power failure detection relay RY ₁ is not energized, normally open contacts RY _1a , RY _1b are open, and normally closed contacts RY 1c, RY _1b are open.
ry _1d is closed and therefore the timer circuit
TM does not operate, timer contact tm continues to be open, inverter input switching relay RY ₄ is not energized, and power is not supplied to the gas leak detection sensor.

In addition, D ₁ to ₄ are diodes, L is a choke coil, R is a resistor, C is a capacitor, and MCB ₁ to MCB ₄
is a wire breaker for wiring.

As a result of this configuration, the operation blocking state of the inverter main unit IN cannot be released unless the commercial AC power supply E continues to supply power for the timer period to the gas leak detection sensor (after preheating is completed) after the power is turned on. By making this timer time longer than the preheating time of the gas leak detection sensor, no preheating current is supplied from the inverter main body IN to the gas leak detection sensor, and the preheating power is transferred to the inverter main body.
There is no need to design the IN capacity, and the inverter body IN can be made cheaper and smaller. Furthermore, since the inverter main body IN does not supply preheating current, the output voltage does not drop, and malfunction of the gas leak detection sensor can be prevented.

Another embodiment of the invention is shown in FIG. In other words, this power supply device for supplying power to a gas leak detection sensor uses a switch SW that detects the completion of preheating of the gas leak detection sensor using temperature, current, etc. and closes the switch instead of the timer contact tm shown in Fig. 2. The timer circuit TM, auxiliary relay RY ₃ , normally open contact RY _1b and normally closed contact RY _1d are removed.

This power supply device for gas leak detection sensor power supply is
Power is supplied to the gas leak detection sensor from the commercial AC power supply E, and the inverter main unit IN can only operate after the gas leak detection sensor has been preheated.Other operations and effects are as shown in Figure 2. It is similar to that.

As described above, in the gas leak detection sensor power supply device of the present invention, the power consumption during the preheating period immediately after power-on is greater than the power consumption in the standby state when preheating is complete. A power supply device for leak detection sensor voltage detection, comprising a commercial AC power supply that constantly supplies power to the gas leak detection sensor, a non-commercial power supply, and an emergency power supply that operates when the commercial AC power supply is out of power. an inverter main body that supplies power to the gas leak detection sensor at the same voltage and frequency as the commercial AC power supply; and an inverter main body that supplies power to the gas leak detection sensor at the same voltage and frequency as the commercial AC power supply, and a Since the inverter is equipped with an inverter operation prevention means for inhibiting operation, the gas leak detection sensor is always preheated using a commercial AC power source, and no power is supplied from the inverter main body to the gas leak detection sensor during preheating. For this reason, even if the capacity of the inverter itself is small enough to cover the power consumption in the standby state after the preheating of the gas leak detection sensor is completed, it is possible to reduce the cost and size of the inverter itself. Voltage drop in the inverter main body can be prevented, and as a result, malfunction of the gas leak detection sensor can be prevented even when the capacity is reduced to reduce cost and size.

In addition, this gas leak detection sensor power supply device operates the inverter body during a power outage of the commercial AC power supply, and supplies power from the inverter body to the gas leak detection sensor at the same voltage and frequency as the commercial AC power supply. The configuration for coordination between the AC power supply and the inverter body is simple.

[Brief explanation of drawings]

Figure 1 is a load characteristic diagram of the gas leak detection sensor.
FIG. 2 is a circuit diagram of a power supply device for power supplying a gas leak detection sensor according to one embodiment of the present invention, and FIG. 3 is a circuit diagram of a power supply device for power supplying a gas leakage detection sensor according to another embodiment of the present invention. . E...Commercial AC power supply, CG...Constant voltage charging circuit,
BT...Emergency power supply, IN...Inverter main unit,
RY ₁ ...Relay for commercial power failure detection, TM...Timer circuit, SW...Switch.

Claims (1)

[Scope of Claims] 1. A gas leak detection sensor power detection power supply device that detects power in a gas leak detection sensor whose power consumption during a preheating period immediately after power is turned on is greater than power consumption in a standby state when preheating is completed. , a commercial AC power supply that constantly supplies power to the gas leak detection sensor, a non-commercial power supply, and a non-commercial power supply that operates by being supplied with power from the emergency power supply during a power outage of the commercial AC power supply to the gas leak detection sensor. an inverter main body that supplies power at the same voltage and frequency as the inverter main body, and an inverter operation prevention means that prevents the operation of the inverter main body for a period after turning on the commercial AC power until preheating of the gas leak detection sensor is completed. Power supply device for powering the sensor for gas leak detection. 2. Gas leak detection according to claim 1, wherein the inverter operation blocking means is a timer circuit that starts measuring time in response to turning on the commercial AC power source and enables power supply to the inverter main body by a time-up output. Power supply device for sensor power supply. 3. The gas leak detection sensor power supply power supply according to claim 1, wherein the inverter operation blocking means is a switch that detects the completion of preheating of the gas leak detection sensor and enables power supply to the inverter main body. Device.