JPS59955B2 - Emergency light battery checker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a battery checker for emergency lights.

The emergency light battery checker checks whether the storage battery, which is the power source for emergency lights used during a commercial power outage, has the capacity to maintain emergency lighting for a specified period of time. The power is turned off, the emergency lights are turned on, and after a certain period of time a test is made to see if the storage battery maintains the voltage on a certain board, and an indicator light is used to indicate this.

This invention adds a function to such a battery checker to check whether or not a storage battery is properly connected to an emergency light, so that the battery checker functions in the same way as when checking a battery. This aims to prevent users from forgetting to properly connect the storage battery, and to provide a reliable and highly effective display.

FIG. 1 is a circuit diagram of an emergency light to which the present invention is applied.

In the figure, a regular lighting lamp I includes a fluorescent lamp 1 and a choke coil 2, and is connected to a commercial power source 5 via a regular lighting lamp blinking switch 3 and a check switch 4. The emergency lighting lamp (2) consists of a charging circuit (2), an emergency light main circuit (2), a battery checker (V), and a display section (2) (all of which are embodiments of the present invention). The charging circuit (2) includes a power transformer 6, a rectifier T, and a current limiting resistor 8, and has an input end connected to a commercial power source 5 via a check switch 4, and an output end connected to a storage battery 9, which will be described later. The emergency light main circuit (■) doubles as a commercial light source, the fluorescent lamp 1, as an emergency light source, and includes a storage battery (9) as an emergency power source, a high-frequency transistor inverter (10), and a charging circuit (■)
A power failure detection relay 11 connected in parallel with the input terminal of the power failure detection relay 11 , a normally closed contact 12 of the power failure detection relay 11 provided between the storage battery 9 and the transistor inverter 10 , and the fluorescent lamp 1
Connect the wiring between the transistor inverter 10 side and the regular lighting lamp I.
Contacts 13 and 1 for switching between the choke coil 2 side and the choke coil 2 side.
Consisting of 4. The battery checker V connects a series circuit of a DC relay IT used for display purposes and a switching transistor 18 in parallel with a series circuit of voltage dividing resistors 15 and 16, and connects both ends of the voltage dividing resistor 16 to a lambda diode 19. A resistor 2 for leakage current compensation is connected between the base and emitter of the transistor 18 through a series circuit of the base resistor 20 and the base resistor 20, and is connected in parallel with the series circuit between the base resistor 20 and the base and emitter of the transistor 18.
1 is connected, and both ends of the series circuit of resistors 15 and 16 are connected to the output end of the charging circuit. The lambda diode 19 used in the above embodiment has the voltage-current characteristics shown in FIG. 2, and the series circuit of the lambda diode 19 and the resistor Re has voltages V, (high operating point ), the current is blocked and the voltage is V. It has a hysteresis characteristic where current conduction occurs at the low operating point. The display section is connected to the DC relay 17 after the rectifying and smoothing section 23 connected to the commercial power supply side.
An astable multivibrator 26 having a period of several cycles of the power supply voltage and whose load is the relay 25 is connected through the normally open contact 24 of the relay 25, and the normally open contact 27 of the relay 25 is connected to the
It is connected to both ends of an auxiliary current-limiting element 28 connected in series with the chiyoke coil 2 in the regular lighting lamp 1. In the emergency light configured in this way, during general use, when the commercial power is turned on, the regular illumination light 1 operates and the fluorescent light 1 lights up,
During a commercial power outage, the normal lighting lamp 1 stops operating, the normally closed contact 12 of the relay 11 closes in the emergency lamp main circuit, and the contact 1
3 and 14 are switched, and the transistor inverter 10 turns on the fluorescent lamp 1 to provide emergency illumination. When checking the function of the storage battery 9, a commercial power outage is artificially caused in the circuit by, for example, opening the check switch 4 at time TO in FIG. When a commercial power outage occurs, the transistor inverter 10 is connected to the storage battery 9 through the contact 12 and is activated, and as the contacts 13 and 14 are switched, the fluorescent lamp 1 shifts from commercial lighting to emergency lighting. As the storage battery 9 discharges, the voltage VB at both ends decreases, and the lambda diode 1
9 low operating point V. The divided voltage 6 across the resistor 16, which was at a higher voltage, also decreases as shown in FIG. Even after a certain period of time, for example 20 minutes, the divided voltage V, 6 remains at the low operating point V. Unless it becomes lower than , the storage battery 9
has a normal capacity, and in that case, the lambda diode 19 maintains the current blocking state, the transistor 18 is non-conducting, and no current flows through the relay 17, and this state is maintained, and after the power is restored, Also, no defect display is performed.
Next, within a certain time T2, for example at time T as shown in FIG. 4, the divided voltage V,6 reaches the low operating point V. If it becomes lower than , the storage battery 9 does not have the normal capacity,
In that case, the lambda diode 19 which was in the current blocking state
transitions to a current conducting state, and the base current is supplied to the transistor 18.The transistor 18 becomes conductive, current flows to the relay 17, and the relay 17 is activated.The normally open contact 24 closes, and the rectifying and smoothing section is displayed in the display section. The astable multivibrator 26 is connected to the terminal 23, and the relay 25 is energized (0n) and de-energized (0ff) at the period T3, as shown in Fig. 5A.
is repeated, and the normally open contact 27 closes and opens in synchronization with this. Then, at time T, the artificial commercial power outage is lifted, the storage battery 9 is charged through the charging circuit and reaches the required voltage, and the divided voltage 6 also reaches the high operating point voltage corresponding to the required voltage. , reaches a voltage lower than , and maintains its magnitude. That is, once the low operating point voltage V. The lambda diode 19, which has entered the current conduction state due to the following conditions, does not enter the current blocking state because the applied voltage does not exceed the high operating point voltage V, and the relay 11 is kept energized by maintaining the conduction of the transistor 18. Since the contact 24 is closed and the astable multivibrator 26 is operating, the relay 2
The contacts 21 of FIG. The fluorescent lamp 1 periodically brightens and darkens, and as a result of inspection,
It is displayed that the voltage of the storage battery 9 has fallen below a predetermined voltage within time T. After confirming the display, for example, the resistor 21 is momentarily shorted to return the lambda diode 19 to the current blocking state, the transistor 18 is made non-conductive, the relay 17 is de-energized, the contact 24 is opened, and the relay 25 is turned off. After de-energizing and closing the contact 27, the fluorescent lamp 1 can be turned on normally and the display can be canceled. Next, storage battery 9
If the connection is forgotten, a pulsating voltage will be generated at the terminal of the storage battery 9 to be connected, and the voltage V across the resistor 16 will be
, 6 also result in pulsating voltages as shown in FIG. At this time, by selecting the peak value of the pulsating voltage V, 6 to be lower than the high operating point voltage V, the lambda diode 19 maintains the current conduction state, and the relay 17 is activated by the conduction of the transistor 18, and the commercial power supply is also maintained. Regardless of the situation, the fluorescent lamp 1 becomes brighter and darker, indicating that the user has forgotten to connect the storage battery 9. FIG. 7 shows another embodiment of the invention, in which a Schmitt circuit including transistors 29 and 30 is used in place of the circuit including the lambda diode 19 in the battery checker of FIG.
Low operating point V as in FIG.

It is possible to obtain hysteresis operation due to the high operating point V. As described above, the battery checker for emergency lights according to the present invention uses a hysteresis circuit in the battery checker connected to the charging circuit output terminal in order to detect the voltage of the storage battery, and its hysteresis characteristic is low in operation. The display is configured to activate at a certain point and return to normal at a high operating point, and the high operating point is selected to be lower than the peak value of the pulsating voltage of the charging circuit's no-load output voltage, thereby preventing artificial power outages at certain times. This has the effect of being able to check the capacity of the storage battery and display a defective storage battery, and at the same time detect that the storage battery has been forgotten to be connected and display it in the same way as when charging the storage battery.

In addition, such indications of storage battery failure or forgotten connection,
This is done by brightening and darkening the light source for commercial lighting, so
Compared to cases in which no special indicator light is required and the display is made using a flashing diode or pilot lamp, the light source for commercial lighting, which should normally be turned on, is in a bright and dark state that tends to attract attention, making it difficult to check the display. It is reliable and has a great display effect. In addition, in the above embodiment, the case where the emergency light source is shared with the commercial light source has been described, but it goes without saying that this is not limited to such a case, and the brightness/dark means of the commercial light source may also be used. It is not limited to the examples.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an emergency light using an embodiment of the present invention.
Figure 2 is a voltage-current characteristic diagram of a lambda diode, Figure 3 is a characteristic diagram of a hysteresis circuit using a lambda diode,
4 to 6 are respectively explanatory diagrams of the operation of the circuit of FIG. 1, and FIG. 7 is a circuit diagram of another embodiment. ...Charging circuit, ...Battery checker 9...Storage battery, 15, 16...Resistor for voltage division, 17...Relay 18・・・・・・
Transistor, 19...Lambda diode, 2
0... Base resistance, 24... Relay contact, 25... Relay 26... Astable multivibrator, 21... Relay contact, 2
8...Auxiliary current limiting element.

Claims (1)

[Claims] 1. For an emergency lighting device that has a light source for commercial lighting and a light source for emergency lighting, it is connected to the output end of a charging circuit for charging a storage battery, which is an emergency power source, and detects the battery voltage of the storage battery. An emergency light battery checker that performs display is configured to activate the display at the low operating point of the hysteresis circuit and deactivate the display at the high operating point, and this high operating point is set when the charging circuit is under no load. A battery checker for emergency lights, characterized in that the voltage is selected to be higher than the peak value of the pulsating voltage, and the display is obtained by periodically brightening and darkening a light source for commercial lighting.