JPS6117416Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of an inspection display device for inspecting storage batteries. For example, in movie theaters, theaters, etc., the light source is normally turned on using a commercial AC power source, and when an emergency situation such as a fire occurs, This invention relates to an inspection display device such as a guide light that uses a built-in storage battery to turn on a light source to indicate an evacuation direction when commercial AC power is cut off.

In general, this type of guide light (including emergency lights) is required to be installed in hallways and living rooms in buildings where large numbers of people gather. I'm starting to do that. This type of guide lights and emergency lights are also required to regularly report their inspection results.

This type of guide light, emergency light, etc. is equipped with an inspection switch that tests whether the fluorescent lamp lights up in an emergency using a built-in storage battery. There is no effective way to check whether the light is on for the specified time other than keeping the check switch pulled for the specified time, or removing a part of the device and measuring the terminal voltage of the built-in storage battery, which is extremely troublesome. It was strange.

In order to eliminate this drawback, the commercial AC power supply is cut off for a specified period of time, and if the terminal voltage of the built-in storage battery falls below the specified voltage within this period, the light emitting diode for display is turned on, and the LED is turned on again after the specified period of time. An inspection display device as shown in FIG. 1 has been provided in which a light emitting diode continues to light up even when a commercial AC power source is turned on.

An example of this conventional inspection display device will be explained with reference to Fig. 1. In the figure, 1 is a commercial AC power source, 2 is an inspection switch for reproducing an emergency when the commercial AC power source 1 is powered off, 3 is a coil of a relay connected in parallel to the commercial AC power source 1 via the inspection switch, which detects the presence or absence of the commercial AC power source and switches between normal lighting and emergency lighting. 4 is a charging transformer for charging a storage battery 7 for lighting an emergency light source (not shown) such as a fluorescent lamp when the commercial AC power source 1 is powered off in an emergency, 5 is a diode bridge connected to the secondary side of the charging transformer for rectifying AC, 6 is a limiting resistor for limiting the current that charges the storage battery 7 under normal conditions, 7 is a storage battery connected in parallel to the diode bridge 5 via the limiting resistor, 8 is an inverter connected in parallel to the storage battery 7 via a contact 9 of the relay 3 and converts the DC of the storage battery 7 into AC, and when the commercial AC power source 1 is cut off in an emergency such as a power outage, the storage battery 7 is connected by the contact of the relay 3. Reference numeral 10 denotes an inspection and display device connected to both ends of the storage battery 7. The inspection and display device includes an n-gate thyristor 13 that becomes conductive when the gate voltage becomes lower than the anode voltage, and once it becomes conductive, it maintains the conductive state until the current that flows becomes equal to or lower than the holding current.
A light emitting diode is attached to the outside of the device so that the light emitting state can be confirmed from the outside when the gate thyristor 13 is turned on. A Zener diode 12 determines a reference voltage for turning on the n-gate thyristor 13.
2, a resistor 11 for limiting the current flowing through an n-gate thyristor 13 and a light-emitting diode 14
A resistor 15 which divides the voltage of the storage battery 7 and determines the gate voltage of the n-gate thyristor 13.
A series circuit of resistor 11 and zener diode 12 and a series circuit of resistors 15 and 16 are connected across the storage battery 7, and an n-gate thyristor 13 has its anode connected to the junction between resistor 11 and zener diode 12, its cathode connected to the junction between resistors 15 and 16, and its cathode connected to one side of the storage battery 7 via a light-emitting diode 14. Reference numeral 101 denotes a reset circuit connected between the anode of the n-gate thyristor 13 and one end of the verter 8, for resetting the n-gate thyristor once in a conductive state when the gate voltage becomes higher than the anode voltage, and is composed of a parallel circuit of a capacitor 17 and resistor 18 and a diode 19 connected in series to this parallel circuit.

Next, to explain how to inspect the storage battery 7 in the inspection display device configured in this way, first, when the commercial AC power supply 1 is shut off by the inspection switch 2,
The relay 3 becomes de-energized, the storage battery 7 is connected to the inverter 8 via the contacts 9, and the fluorescent lamp serving as the emergency light source is turned on by the storage battery 7.
The terminal voltage of the storage battery 7 is also applied to the inspection display device 10, but since the voltage of the zener diode 12 of the inspection display device 10 is kept constant even if the voltage of the storage battery 7 drops, the n-gate thyristor 1
The anode voltage of No. 3 is also constant. On the other hand, the storage battery 7 is used as the gate voltage of the n-gate thyristor 13.
As time passes, the storage battery 7 is discharged and the terminal voltage gradually drops, and the gate voltage of the n-gate thyristor 13 also drops. Then, when the gate voltage of this n-gate thyristor 13 falls below the anode voltage,
The n-gate thyristor 13 becomes conductive, and the light emitting diode 14 lights up. Note that once the n-gate thyristor 13 becomes conductive, it remains conductive until the flowing current becomes less than the holding current, so even if the commercial AC power supply 1 is restored after a specified period of time, the light emitting diode 14 continues to light up. Therefore, if the light emitting diode 14 lights up when the indicator lamp is checked after a specified period of time, it can be seen that the storage battery 7 has already reached the end of its life.

Since the inspection display device is configured in this way,
Although the lifespan of the storage battery 7 can be ascertained by a simple method of checking the light emitting diode 14, it has the following drawbacks. (1)Storage battery 7
If the load circuit including the
Even though guide lights and the like do not turn on in an emergency, the light emitting diode 14 does not turn on during inspection and displays that the storage battery 7 is normal. (2) When the number of unit cells constituting the storage battery 7 is small, even if one unit cell is short-circuited, the voltage drop of the light emitting diode 14 is large, so the light emitting diode 1
4 does not light up. (Such a phenomenon occurs even when the n-gate thyristor becomes conductive). (3) If an internal short circuit occurs in the unit cell composing the storage battery 7, the voltage applied to the inspection display device will drop, and even if the light emitting diode 14 lights up,
As the brightness decreases, the light emitting state of the light emitting diode 14 becomes difficult to see and is easily misidentified.

This idea was devised in view of the above drawbacks, and uses a relatively simple circuit configuration to enable a storage battery to be inspected when the commercial AC power is restored after a specified period of time.
To provide an inspection display device that always displays when a storage battery reaches the end of its life or becomes defective due to a partial short circuit or an internal short circuit in a unit cell constituting the storage battery.

An embodiment of this invention will be explained below based on FIG. 2. In the figure, 20 is connected in series with a limiting resistor 6, and when the commercial AC power supply is cut off in an emergency such as a power outage, the voltage from the storage battery 7 is a diode for preventing current from flowing to the inspection display device 10; 22 is a zener diode that determines a reference voltage that turns on the n-gate thyristor 13 when the voltage of the storage battery 7 falls below a specified voltage; This resistor is used to limit the current flowing through the zener diode, and is connected in series with the zener diode to the output side of the diode bridge. 23
is a smoothing electrolytic capacitor connected in parallel with the Zener diode 22, which converts the pulsating current rectified by the diode bridge 5 into direct current with less ripple. 24 is a discharge resistor connected in parallel with this electrolytic capacitor, 25 is a limiting resistor connected between the contact between the resistor 21 and the Zener diode 22, and the anode of the n-gate thyristor 13, and the n-gate thyristor 13 and the light emitting This limits the current flowing through the diode 14. 26, 27
is connected between both terminals of the storage battery 7.
The gate of the n-gate thyristor 13 is connected to the contact point between the resistor 26 and the resistor 27, and a voltage proportional to the voltage of the storage battery 7 is applied to this gate.

To explain how to inspect the storage battery 7 in the inspection display device configured in this way, first, when the commercial AC power supply 1 is cut off by the inspection switch 2, the relay 3
is de-energized, the storage battery 7 is connected to the inverter 8 via the contact 9, and a fluorescent lamp serving as an emergency light source is turned on, and the terminal voltage of the storage battery 7 is applied to the series circuit of the dividing resistors 26 and 27. A voltage proportional to the terminal voltage of the resistor 27, that is, the terminal voltage of the storage battery 7 is applied to the gate of the n-gate thyristor 13. Further, the storage battery 7 is discharged over time, and its terminal voltage is gradually decreasing. After a specified period of time has elapsed, when the commercial AC power supply 1 is restored, the voltage of the charging transformer 4 is rectified by the diode bridge 5 and applied to the zener diode 22 via the resistor 21. This voltage is smoothed by the electrolytic capacitor 23, becomes a DC with little ripple, and is applied to the anode of the n-gate thyristor 13 via the limiting resistor 25, and the voltage of the zener diode 22 makes the n-gate thyristor 13 conductive. This serves as a reference voltage for determining whether or not to light the light emitting diode 14. Therefore, if the voltage of the zener diode 22, that is, the anode voltage of the n-gate thyristor 13, is lower than its gate voltage, that is, the divided voltage of the storage battery 7, the n-gate thyristor 13 will not conduct and the light emitting diode 14 will not light up. From this, it can be seen that the storage battery 7 still has enough capacity to withstand use. Conversely, if the anode voltage of the n-gate thyristor 13 is higher than the gate voltage, the n-gate thyristor 13 becomes conductive, and as long as the commercial AC power supply 1 is applied, even if the gate voltage of the n-gate thyristor 13 increases. The light emitting diode 14 lights up while maintaining the conductive state, which indicates that the storage battery 7 has reached the end of its life.

Furthermore, even if the storage battery 7 becomes defective due to a partial short circuit or internal short circuit of the unit cells constituting the storage battery 7, the gate voltage of the n-gate thyristor 13 will decrease, and the gate voltage of the n-gate thyristor 13 will decrease. The anode voltage is always kept at a constant reference voltage by the commercial AC power supply 1, and the power for lighting the light emitting diode 14 is supplied by the commercial AC power supply 1. Therefore, even if the storage battery 7 has only one unit cell, Even if the battery 7 becomes unusable, the light emitting diode 14 lights up with normal brightness, indicating that the storage battery 7 is no longer usable.

As mentioned above, this idea is based on the detection voltage that detects the output voltage of the storage battery, and the reference voltage generated by the commercial AC power supply when the commercial AC power supply is cut off for a specified period of time during inspection of the storage battery and then turned back on again. The difference between the detected voltage and the reference voltage is displayed based on the power of the commercial power source, which reduces the lifespan of the storage battery and eliminates defects caused by short circuits or internal short circuits in the batteries that make up the storage battery. It is possible to obtain a large practical inspection display device.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an inspection display device incorporated in a conventional guide light, and FIG. 2 is a circuit diagram showing an inspection display device incorporated in a guide light which is an embodiment of this invention. In the figure, 1 is a commercial AC power supply, 2 is an inspection switch, 7 is a storage battery, 10 is an inspection display device, and 13 is an n
type gate thyristor, 14 is a light emitting diode, 2
2 is a Zener diode, and 26 and 27 are dividing resistors. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A detection circuit that detects the terminal voltage of the storage battery, a circuit that generates a reference voltage from the commercial AC power supply when the commercial AC power supply is cut off for a specified period of time during inspection of the storage battery and then restored, and a voltage detected by the detection circuit. An inspection display device comprising: a display circuit that compares the detected voltage with a reference voltage and displays an indication when the detected voltage is lower than the reference voltage; and a circuit that applies power from the commercial power source to the display circuit.