JPS5971294A - emergency lighting equipment - 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 fixture that lights up a lighting load during a commercial power outage.

BACKGROUND ART Conventionally, as shown in FIG. 1, an emergency lighting device has been developed in which an emergency lamp L is turned on by a built-in secondary battery B during a power outage of a commercial power source AC. In the conventional example shown in Fig. 1, there is a error detection circuit (1) for detecting abnormalities such as disconnection of the emergency UzuL, and a battery check circuit for detecting abnormalities in the built-in secondary battery B. The conventional circuit shown in FIG. If the secondary battery B is normally connected during a non-power outage, the secondary voltage of the power transformer PT is rectified by the full-wave rectifier Re, and the secondary battery B is charged via the charging resistor R11f.At this time, Capacitor Cs is diode DI.

It is charged via D2, so transistor Q1 is turned off and transistor Q2 is also turned off. At this time, if the emergency lamp L is normal, the lamp L
The current flowing through turns transistor Q3 on and transistor Q4 off. On the other hand, if the run-L is disconnected or disconnected, the lamp abnormality detection circuit (
1) transistor. Since the Basmi current does not flow through the transistor Q3, the transistor Q3 is turned off and the transistor Q4 is turned on, the light emitting diode L1 lights up, indicating that the light emitting diode L1 is abnormal.

Also, the transistor Q=, Q6. The circuit including Qt is a battery monitor circuit (2), which is configured with a Schmitt circuit, and when the battery voltage drops, the transistor Q
6, a current flows through the light emitting diode L1, and the light emitting diode L1 lights up, indicating that the secondary battery B is abnormal. In addition, during such non-power outage, if the secondary battery B is disconnected, the power transformer P
The peak value of the secondary voltage of T is charged to capacitor C3,
The Zener voltage is lower than the charging voltage, and the secondary battery B
Zener diode Z whose Zener voltage is higher than the terminal voltage of
Since the base current flows through D to the transistor Q4 and turns on the transistor Q4, the light emitting diode Ls lights up to indicate an abnormality.

Next, in an emergency when the commercial power supply AC is out of power, no voltage is generated on the secondary side of the power transformer PT, so capacitor C1 is not charged, and from secondary battery B to transistor C)
The Sumi current flows to lK, turning on the transistor Q1 and turning on the transistor Q2, so the emergency lamp L lights up. At this time, the current flowing through the diode D3 connected to the collector of the transistor Q1 causes the transistor Q to
3'(il- is turned on and transistor Q4'fr is turned off to prevent current from flowing through the light emitting diode Ll when the run "jL" is turned on or in case of a housing emergency.

By the way, in the conventional example circuit shown in FIG. 1, when a battery with a small number of cells is used as the built-in secondary battery B,
Since the lighting voltage of the light emitting diode L1 is usually about 2V, which is relatively high, there is a problem that the light emitting diode L1 cannot be fully lit.

The invention was made in order to solve these problems of the conventional example, and even when a secondary battery with a small number of cells is used, the light emitting diode for abnormality indication can be lit normally. The overall purpose is to provide emergency lighting equipment that is suitable for use in emergency situations.

The configuration of the present invention will be described below with reference to illustrated embodiments. Second
The figure shows one embodiment of the present invention, and the basic configuration is the same as the conventional example in Figure 1, or the lamp abnormality detection circuit f
1) and the light emitting diode I that lights up during the detection operation of the battery check circuit (2) is powered from the output side of the diode bridge Re. This diode bridge Re is connected to a charging circuit (3
). The secondary battery B uses a battery with a small number of cells, and its battery voltage vB is lower than the voltage drop value Vpj when the light emitting diode L+ is turned on, as shown in Figure 5. . In FIG. 5, Va indicates the voltage value at the output terminal a of the diode bridge Re, and this voltage Va has a higher peak value than the voltage vF. Also, vb is the plus of capacitor C1 @
The voltage value at b is shown. This capacitor Ct, transistors Q, Q2 and diode Ds,
Together with Ih and the like, it constitutes an emergency lighting circuit (4).

As mentioned in the explanation of the conventional example in FIG.
The transistors Q, , Q2 are turned on due to a drop in the charging voltage of the battery, and the emergency lamp L is lit by the secondary battery B. However, in the embodiment shown in FIG. 2, when the lamp L is disconnected or removed from the socket during non-power outage, or when the battery voltage drops, the lamp malfunctions as in the case of the conventional example shown in FIG. The transistor Q4 of the detection circuit +1) and the transistor Q6 of the battery check circuit (2) are turned on. At this time, the voltage for lighting the light emitting diode L1 is not the battery voltage vB, but the voltage Va at the output terminal a of the diode bridge Re.
Therefore, the light emitting diode L1 lights up normally. Here, in order to obtain sufficient lighting current for the light emitting diode L1, it is necessary to increase the secondary voltage of the power transformer PT, and at this time, it is necessary to make sure that the charging current to the secondary battery B does not become too large. Fig. 1 Charging resistance R1 compared to conventional example
It is desirable to increase . Next, FIG. 3 shows another embodiment of the invention, in which the power for lighting the light emitting diode L1 is supplied from the positive end of the capacitor C1. In this embodiment, even if the battery voltage of the secondary battery B is approximately the same as the forward voltage drop value of the light-emitting diode Ll, the lighting current from the secondary battery B to the light-emitting diode L1 is generated during a power outage of the commercial power supply AC. never flows. In addition, since the lighting circuit for the light emitting diode L+ and the charging circuit (3) are separated, selection of the resistance value of the charging resistor R+ and design of the secondary voltage of the power transformer PT are easier than in the embodiment shown in FIG. can be done. FIG. 4 shows still another embodiment of the present invention, in which power is supplied to the collector of transistor Q3 from capacitor C1 to resistor RO.
This is done through the
This eliminates the need for the diode D3 in the conventional circuit, which is used to turn off the transistor Q4 during a power outage.

The present invention is configured as described above, and uses a secondary battery whose battery voltage is approximately the same level or lower than the forward voltage drop value when the light emitting diode is lit, and a voltage obtained by step-down rectification of the commercial power supply voltage. A charging circuit that charges a secondary battery,
An emergency lighting circuit that uses a secondary battery to turn on an emergency lighting load when a power outage is detected in the commercial power supply, and a light emitting diode that uses a voltage obtained by step-down rectification of the commercial power supply voltage when an abnormality such as a drop in battery voltage or a defective lighting load is detected. Since the light-emitting diode is equipped with an abnormality detection display means that drives the light-emitting diode to turn on, even when a low-voltage secondary battery with a small number of cells is used, the light-emitting diode is activated by step-down rectification of the commercial power supply voltage during non-power outages. The lights can be driven successfully,
Therefore, even in an emergency heating device using a low-voltage secondary battery with a small number of cells, there is an advantage that abnormalities such as a drop in battery voltage or a defective lighting load can be indicated by the light emitting diode.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional example, FIGS. 2 to 4 are circuit diagrams showing different embodiments of the present invention, and FIG. 5 is an explanatory diagram of the same operation.

Claims (1)

[Claims] (1) A secondary battery whose battery voltage is approximately the same level or lower than the forward voltage drop value when the light emitting diode is lit, and a charging circuit that charges the secondary battery with a voltage obtained by step-down rectifying the commercial power supply voltage. , an emergency lighting circuit that lights up an emergency lighting load using a secondary battery when a commercial power outage is detected;
An emergency lighting device characterized by comprising an abnormality detection display means that lights and drives a light emitting diode with a voltage obtained by step-down and rectifying the commercial power supply voltage when an abnormality such as a drop in battery voltage or a defective lighting load is detected. .