JPS5868894A - emergency lighting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emergency lighting device that is turned on for the purpose of evacuation, guidance, or security when a power outage occurs due to an accident or fire.

Generally, in this type of device, a rechargeable battery connected to a power source is provided inside or outside the appliance, and the battery is connected to the emergency light to turn on or off depending on whether the power source is normal or during a power outage. It is equipped with an OFF switch. The rechargeable battery is usually a secondary battery such as a nickel-cadmium battery, and is always kept fully charged.

However, in conventional systems, when a power outage occurs, the emergency lights are turned on even during daytime when the surroundings are bright, and the rechargeable battery is discharged.

For example, emergency lights are only guaranteed to stay on for about 30 minutes, and once they are discharged, they are useless until they are recharged.

That is, it takes 24 to 48 seconds for a rechargeable battery to be fully charged.
It takes time, and if the power outage continues for a long time or is repeated, the original function cannot be achieved.

The present invention has been made in view of these points, and an object of the present invention is to provide an emergency lighting device that can effectively utilize the amount of electricity of a rechargeable battery.

The present invention connects a rechargeable battery and an emergency light via a power supply detection mechanism, and connects a photoswitch connected to a sensor that detects ambient illuminance separately from the power supply detection mechanism. Even if there is a power outage when the surroundings are bright, the emergency lights are not turned on, but are turned on only when the surroundings are dark, thereby preventing wasteful consumption of the rechargeable battery.

An embodiment of the present invention will be described based on FIGS. 1 and 2. First, to explain the block diagram shown in FIG. 1, a constant lighting circuit (3) that controls the blinking of a lighting lamp (2) that is always on is connected to a power source (1). A relay (5) constituting a power supply detection mechanism (4) is connected in parallel with the power supply detection mechanism (4). Still, the constant lighting circuit (
A charging circuit (8) consisting of a transformer (6) and a rectifier (7) is connected in parallel with 3), and a rechargeable battery (9) is connected to this charging circuit (8). This rechargeable battery (9)
is turned on by the photo switch α1 and the relay (5).
- OFF and one emergency light α are connected via the race unit α■. Further, a sensor α1 for detecting ambient illuminance is connected to the photoswitch α1.

In such a configuration, when the power source (1) is normal, the illumination light (2) is turned on by the operation of the constant lighting circuit (3), and at the same time, the charging power source (9) is charged via the charging circuit (8). will be done. Also, since the relay (5) is energized,
The relay switch (1) is in OIi"F L.

However, when a power outage occurs, the light (2) turns off,
Since the relay (5) is not energized, the relay switch α is turned ON and the rechargeable battery (9) is no longer charged. If the surrounding illuminance is low, the sensor (L'
3, the photo switch αQ is closed and the emergency lights θ are turned on, and if the surrounding illuminance is high, A-) The switch α0 is open, so the emergency lights α are not turned on. Therefore, the rechargeable battery (9) is in use only when the emergency light α proverbial light is needed, so that unnecessary consumption is avoided.

Next, a description will be given of what is shown in FIG. 2, which is applied to a safety power outage light. First, when there is an AC power source, the voltage is stepped down by the transformer Tα→, rectified by the diode DI (G), and the current is limited by the negative electrode side resistor R1 (IQ), which serves as the power detection mechanism, to charge the T4L battery BAα. .This rechargeable battery B
A (1 car is loaded with 0 emergency lights.

A transistor Qlα is inserted as a switch between the emergency light a and the rechargeable battery BAα with its emitter on the negative polarization side of the battery, and its base is connected to the transformer Tα→ side of the resistors R and αQ. There is. Also, the base is resistor R3
] is also connected to the positive electrode of the rechargeable battery BA (1).Due to the charging current during charging, a voltage drop occurs in the resistor Rrno with the positive side of the rechargeable battery BAα, and the voltage drop between the base and emitter of the transistor Qlα occurs. is reverse biased and OFF between c and 8 L, Emergency light (no current is supplied to the L mark. During a power outage, the rechargeable battery BA07 is connected to the resistor R3.
), the transistor Qla field is turned on and the emergency light 0 symbol lights up. Now, C-E of transistor Qza2 which becomes a photoswitch is connected in parallel between B-B of transistor Q+α0, and a sensor (C) consisting of a CdS optical sensor and a resistor R2 ( A series circuit with transistor Q is included.
The voltage dividing point is connected to the base of 2Q1).

However, when there is a lot of incident light on the sensor (c), the resistance value of CdS decreases, transistor Q2 (ell) turns on, and transistor Q1 (to) B-E is shorted [-, transistor Q1 (to) is turned off (L, emergency). Turn off the light α frame.

In addition, when there is little incident light, the resistance value of CdS increases and transistor Q20 turns OFF L, transistor Q
t QI turns ON and the emergency light α lights up. If there is a power outage but the surroundings are bright and the emergency light α-Enoki does not turn on, the power outage can be recognized by providing a means to display the power outage to distinguish it from normal times. In the illustrated example, the display is performed using a blank lamp (c).

Note that the diode D2 (c) and the diode D3 are for protection.

Next, the present invention will be explained in detail based on FIG. First, a transformer T (c) is connected to the power supply (c), and a diode D+ C31), a rechargeable battery BA (3 cores, diode D23), and a resistor RtCII that becomes part of the power detection mechanism are connected to the transformer T (c). connected to the rechargeable battery DA (
An emergency light 04 and a transistor Ql (c) serving as a photoswitch are connected in parallel with (1). There is a resistor I between the base of this transistor Q+C (time) and the transformer T (c).
h0f) is connected, and a resistor R3 (c) is connected between its base and the unstable multivibrator 0η. This unstable multivibrator Oη is INVlv I
The capacitor length CTGIO and resistor RTG form a positive feedback loop with the three-stage inverter 0 labeled NV2 and INV3.
II), a sensor consisting of CdS) and a diode DQ3.

However, when the power supply (c) is normal, the rechargeable battery BA
(31), and the transistor Qt(c)l
It is reverse-biased between dB-8 and does not conduct current to the emergency light (b). When there is a power outage, transistor Q1 (c)
The reverse bias of is eliminated, and the base current flows through resistor R3 (b).
is given by the output of the astable multivibrator Of). Now, if the surroundings are bright, the resistance value of the sensor (6), which is Cds, is small, and the time when the output of inverter 00, which is INV3, becomes H is short, as shown in Fig. 4 (t-). On the other hand, if it is dark, the time that the transistor is in H becomes longer as shown in Figure 4.
is ON when the output is H, so the illuminance of the emergency light (b) changes depending on the surrounding brightness.

Incidentally, in each of the embodiments described above, it is a matter of course that the emergency lights and the sensors are provided so that they are not optically coupled.

As described above, the present invention connects an emergency light to a rechargeable battery connected to a power source via a power detection mechanism, and connects a sensor that detects ambient illuminance to a photoswitch connected to the emergency light. As a result, whether or not the emergency lights are turned on is controlled according to the brightness of the surrounding area, thereby eliminating wasteful consumption of the rechargeable battery and ensuring that the emergency lights are turned on when needed. It is something that can be done.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a block diagram, Fig. 2 is a circuit diagram of a power outage light, Fig. 3 is a circuit diagram showing a modified example, and Fig. 4 (4) is a circuit diagram of a power outage light. It is a circuit diagram showing the lighting state of an emergency light.

Claims (1)

[Claims] A rechargeable battery is connected to a power source, and an emergency light that is automatically connected to the rechargeable battery and turned on when the power source is in a power outage state by a power source detection mechanism, is provided with a sensor that detects surrounding illuminance, The emergency light device is characterized in that a photoswitch is connected to the sensor and disables connection between the rechargeable battery and the emergency light if the illuminance is below a predetermined level regardless of the operation of the power supply detection mechanism.