JPS6122784B2 - - Google Patents

Description

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

The battery checker for emergency lights checks whether the storage batteries that power the emergency lights used in the event of a commercial power outage have the capacity to keep the lights on for a predetermined period of time. The system turns off the commercial power supply, turns on the emergency lights, tests whether the storage battery maintains a voltage above a certain level even after a certain period of time, and displays the results using the emergency lights.

FIG. 1 is a circuit diagram of an emergency light that is the basis of this invention. In the figure, the regular lighting lamp includes a fluorescent lamp 1 and a check coil 2, and is connected to a commercial power source 5 via a regular lighting lamp blinking switch 3 and a check switch 4. Emergency lighting consists of a charging circuit, an emergency lighting main circuit, and a battery checker. The charging circuit includes a power transformer 6, a rectifier 7,
It includes a current limiting resistor 8, 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 light 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 power outage circuit connected in parallel with the input terminal of the charging circuit. The detection relay 11, the 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 are connected to the transistor inverter 10 side and the daily lighting coil 2 side. It is composed of contacts 13 and 14 for switching. The battery checker has a current limiting resistor 17, a display light emitting diode 18, and a switching transistor 1 connected in parallel to a series circuit of voltage dividing resistors 15 and 16.
9 series circuits are connected, and a voltage dividing resistor 16 is connected.
Connect both ends of lambda diode 20 and base resistor 21
The base of the transistor 19 is connected through a series circuit of
Furthermore, a parallel circuit consisting of a resistor 22 for leakage current compensation and a normally open reset switch 23 is connected in parallel with the series circuit between the base resistor 21 and the base and emitter of the transistor 19. Both ends of the 16 series circuits are connected to the output end of the charging circuit. The lambda diode 20 used in the above embodiment has voltage-current characteristics shown in FIG. 2, and the series circuit of the lambda diode 20 and the resistor Re has a voltage V ₁ (high operating point) as shown in FIG. ), it enters a current blocking state, and has a hysteresis characteristic in which it enters a current conduction state at voltage V ₀ (low operating point).

In the emergency lights configured in this way, during general use, when the commercial power is on, the regular lighting lights operate and the fluorescent lamp 1 lights up, and when the commercial power is turned on, the regular lighting lights stop operating and the emergency lights are switched on. In the main circuit, the normally closed contact 12 of the relay 11 is closed, and the contacts 13 and 14
is switched, the fluorescent lamp 1 is turned on by the transistor inverter 10, and emergency illumination is provided. When checking the function of the storage battery 9, check the time t ₀ in Fig. 4.
A commercial power outage is artificially caused in the circuit by, for example, opening the inspection switch 4. Cause commercial power outages. When a commercial power outage occurs, the transistor inverter 10 is connected to the storage battery 9 through the contacts 12, and as the storage battery 9 discharges, the voltage at both ends V _B decreases.
As the voltage decreases, the divided voltage _V16 across the resistor 16, which was at a voltage higher than the low operating point _V0 of the lambda diode 20, decreases as shown in FIG. Then, if the divided voltage V ₁₆ does not become lower than the low operating point V ₀ even after a certain period of time, for example 20 minutes,
The storage battery 9 has a normal capacity,
In that case, the lambda diode 20 maintains a current blocking state, the transistor 19 is non-conducting, no current flows through the light emitting diode 18, and no display is performed. Next, when the divided voltage V ₁₆ becomes lower than the low operating point V ₀ within a certain time t ₂ , for example at time t ₁ as shown in FIG. 4, the storage battery 9 does not have a normal capacity. In that case, the state shifts to a current blocking state, and the base current is supplied to the transistor 19,
The transistor 19 becomes conductive and the light emitting diode 18
A current flows, the light emitting diode 18 emits light, and it is displayed that the voltage has fallen below the voltage of the storage battery 9 within time _t2 . Then, at time _t2 , 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 _V16 also increases to the high operating point voltage corresponding to the required voltage. It reaches a voltage lower than V ₁ and maintains its magnitude. That is, the lambda diode 20, which once becomes lower than the low operating point voltage V ₀ and enters the current conducting state, does not enter the current blocking state because the applied voltage does not become higher than the high operating point voltage V ₁ , and the transistor 19 By maintaining continuity, the light emission of the light emitting diode 18 is maintained, and the state of the storage battery 9 after a certain period of time for battery inspection is memorized and displayed as is. After confirming the display, the reset switch 23 is momentarily closed to substantially short-circuit the resistor 21 in series with the lambda diode 20, thereby returning the lambda diode 20 to the current blocking state, making the transistor 19 non-conductive, and turning off the light emitting diode. 18 can be canceled.

In this way, the battery checker for emergency lights, which is the basis of this invention, uses a hysteresis circuit in the battery checker connected to both ends of the storage battery to detect the voltage of the storage battery, and the low operating point of the hysteresis characteristic is Since the display is configured to activate the display and return to the high operating point, it is possible to check the capacity of the storage battery due to an artificial power outage for a certain period of time and indicate a faulty storage battery. This has the effect of memorizing the display even after entering the state, making it convenient to check the display, but the battery checker display may or may not operate depending on whether the capacity of the storage battery is good or bad. The charging state of the storage battery in parallel with the battery checker, for example, the charging state that occurs after recovery charging with a large current when charging is restarted and enters a compensatory charging state with a small current, and the charging current when the display is activated is compensated charging If the current value is set to the required current value when the display is not activated, the charging current will become too large, resulting in overcharging. Conversely, if the charging current value when the display is not activated is set to the compensation current, the charging current will decrease when the display is activated, and the storage battery will There was a drawback of insufficient charging.

Therefore, an object of the present invention is to ensure that the state of the charging current after the completion of an artificial power outage remains exactly the same even if the display is activated or deactivated.

FIG. 5 shows an embodiment of the present invention. In the battery checker shown in FIG. 1, a compensation transistor 24 and a current compensation A series circuit of an emitter resistor 25 is connected, and the base and emitter of the transistor 24 are connected between the collector and emitter of the transistor 19 via the base resistor 26 and the emitter resistor 25 to form an emitter follower type.

In this way, in the circuit, the battery checker can detect a defect in the storage battery 9 and perform a light-emitting display using the light-emitting diode 18, similar to the one in FIG. At this time, when the light emitting diode 18 is emitting light, the transistor 19 is conductive and the transistor 24 is non-conducting. When the light emitting diode 18 is not emitting light, the transistor 19 is non-conducting and the transistor 24 is non-conducting. Although it is conducting and supplying current to the emitter resistor 25,
Since the transistors 19 and 24 are configured as emitter follower types, the voltages supplied to the series circuit including the transistor 19 and the series circuit including the transistor 24, that is, the voltage V ₉ of the storage battery 9 and the currents I ₁₉ and I of the transistors 16 and 24 ₂₄ relationships are
By adjusting the emitter resistance 25 at one point, the current I ₁₉ and the current I ₂₄ can be adjusted linearly as shown in FIG.
Therefore, no matter what the voltage _V9 of the storage battery 9 is, the current supplied to the battery checker does not differ depending on whether the light emitting diode 18 is displaying light or not. There is no difference in the charging current of the storage battery 9 regardless of whether the display is activated or not, and the storage battery 9 is neither overcharged nor undercharged, and can always maintain an appropriate state of charge.

FIG. 7 shows another embodiment of the present invention, in which a Schmitt circuit including transistors 27 and 28 is used in place of the circuit including the lambda diode 20 of the battery checker shown in FIG. It is designed to obtain hysteresis operation with the point V ₀ and the high operating point V ₁ , and similarly to the one in Fig. 5, it memorizes and displays the failure of the storage battery 9, and also indicates the storage battery charging current when the display is activated or not. Eliminate the difference between
Good charging characteristics can be obtained.

As described above, the battery checker according to the present invention allows the battery checker to have a hysteresis characteristic in the switching characteristics of the output transistor so as to memorize a storage battery failure indication even after the end of an artificial power outage, and to In parallel with the series circuit, a transistor with a current compensation element such as a resistor, which conducts and deconducts in reverse linkage with the output example, is connected in an emitter follower type, so it is difficult to determine what the voltage of the storage battery is. Even in the event of an artificial power outage, the charging current of the storage battery after the end of an artificial power outage can be made the same regardless of whether the display element is activated or deactivated, thereby effectively preventing overcharging or undercharging of the storage battery.

In the embodiment, a light emitting diode was used for display, but it goes without saying that other display elements may be used as long as they have an excellent display effect and can provide sufficient brightness with a relatively small current.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an emergency light that is the basis of this invention, Fig. 2 is a voltage-current characteristic diagram of a lambda diode, Fig. 3 is a characteristic diagram of a hysteresis circuit using a lambda diode, and Fig. 4 is a diagram similar to that shown in Fig. 1. 5 is a circuit diagram showing one embodiment of the present invention, FIG. 6 is a characteristic diagram thereof, and FIG. 7 is a circuit diagram of another embodiment. ...Emergency lighting, ...Charging circuit, ...
Battery checker, 9...Storage battery, 15,1
6... Resistor for voltage division, 18... Light emitting diode, 1
9...Transistor, 20...Lambda diode, 24...Compensation transistor, 25...Emitter resistor for current compensation.

Claims (1)

[Claims] 1. In the battery checker for emergency lights, which is connected to both ends of the storage battery for emergency power supply that is normally in a charged state, and which detects the battery voltage of the storage battery after a certain period of artificial power outage and displays the required display, the hysteresis circuit A display element is connected in series with a main transistor that is closed at a low operating point and opened at a high operating point, and a compensation transistor and a current compensation element that open and close in reverse linkage with the main transistor are connected in parallel. A battery checker for emergency lights that is characterized by being connected to an emitter follower type.