JPS5947439B2 - Battery checker for emergency lights - 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 that powers the emergency lights used in the event of a commercial power outage has the capacity to maintain the emergency lighting for a predetermined 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 battery maintains a voltage above a certain level, and an indicator light is used to indicate this.

This invention adds a function to such a battery checker to check whether or not the storage battery is properly connected to the emergency light, so that it operates in the same way as when checking the battery, and when the emergency light is first installed or when the storage battery is replaced. This system is designed to prevent people from forgetting to properly connect storage batteries, etc., and also to detect and display abnormal temperature rises in emergency lighting equipment. Figure 1 shows an emergency system to which this invention is applied. It is a circuit diagram of a light.

In the figures, a regular lighting lamp I includes a fluorescent lamp 1 and a fluorescent lamp 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), and a battery checker V (an embodiment of the present invention). The charging circuit ■ includes a power transformer 6, a rectifier 1, a current limiting resistor 8,
Connect the input end to the commercial power supply 5 via the inspection switch 4,
The output end is connected to a storage battery 9, which will be described later. The emergency light main circuit (■) doubles as a commercial light source, such as a fluorescent lamp 1, as an emergency light source, and is connected in parallel with a storage battery (9) as an emergency power source, a high-frequency transistor inverter (10), and the input terminal of the charging circuit (■). The power failure 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 choke coil 2 side of the regular lighting lamp I. It is composed of contacts 13 and 14 for switching between the two. The battery checker V connects a series circuit of a current limiting resistor IT, a display light emitting diode 18, and a switching transistor 19 in parallel to a series circuit of a positive characteristic heat-sensitive resistor 15 for voltage division and a normal resistor 16, and Both ends of the pressure resistor 16 are connected to a lambda diode 20 and a base resistor 2.
A resistor 22 for leakage current compensation and a normally open resistor 22 are connected in parallel to the series circuit between the base resistor 21 and the base and emitter of the transistor 19. A parallel circuit of the reset switch 23 is connected, and both ends of a series circuit of resistors 15 and 16 are connected to the output end of the charging circuit. The lambda diode 20 used in the above embodiment has the voltage-current characteristics shown in FIG. 2, and the series circuit of the lambda diode 20 and the resistor R has a voltage V1 (sounding point) as shown in FIG. , the current is blocked and the voltage is V.

It has a hysteresis characteristic in which current conduction occurs at the resistance operating point. In the emergency light configured as described above, during general use, the regular lighting lamp 1 operates and the fluorescent lamp 1 lights up when the commercial power is turned on, and when the commercial power is turned off, the regular lighting lamp 1 stops operating. Normally closed contact 1 of relay 11 in the emergency light main circuit
2 is closed, contacts 13 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, check at time T in FIG. A commercial power outage is artificially caused in the circuit by, for example, opening the inspection switch 4. When a commercial power outage occurs, the transistor inverter 10 connects the storage battery 9 via the contact 12.
As the storage battery 9 discharges, the voltage V across both ends increases.
As B decreases, the low operating point V of the lambda diode 20
. The divided voltage V across the resistor 16 at a voltage higher than
l6 also decreases as shown in FIG. Even after a certain period of time, for example 20 minutes, the divided voltage Vl6 remains at the low operating point V. , the storage battery 9 has a normal capacity, and in that case, the lambda diode 20 maintains a current blocking state, the transistor 19 is non-conducting, no current flows to the light emitting diode 18, and the display is not displayed. Not done. Next, fixed time T2? Among them, for example, as shown in FIG. 4, the divided voltage V]6 at time t1 is the low operating point V. If it becomes lower than , the storage battery 9 does not have a normal capacity, and in that case, the lambda diode 20 which was in the current blocking state changes to the current conducting state, and the base current is supplied to the transistor 19. The light emitting diode 18 becomes conductive and current flows through the light emitting diode 18, and the light emitting diode 18 emits light, indicating that the voltage of the storage battery 9 has fallen below a predetermined voltage at time T2. Then, at time T2, the artificial commercial power outage is canceled, and the storage battery 9 is charged through the charging circuit to reach the required voltage, and the divided voltage Vl6 also reaches the required voltage and maintains its level. That is, once the low operating point voltage V. The lambda diode 20, which has entered a current conduction state due to the following conditions, does not enter a current blocking state because the applied voltage does not exceed the high operating point voltage V1, and the light emission of the light emitting diode 18 is maintained by maintaining conduction of the transistor 19. However, the state of the storage battery 9 after a certain period of time for battery inspection is memorized and displayed as is. After checking the display, close the reset switch 23 momentarily and connect the resistor 2 in series with the lambda diode 20.
By effectively shorting 1, the lambda diode 20 can be returned to a current blocking state, rendering the transistor 19 non-conducting and deactivating the display of the light emitting diode 18. Next, if you forget to connect the storage battery 9,
A pulsating voltage is applied to the terminals to be connected, and the voltage Vl6 across the resistor 16 also becomes a pulsating voltage as shown in FIG.

At this time, the peak value of the pulsating voltage Vl6 is set to the high operating point voltage V1
By choosing a lower value, the lambda diode 20 maintains the current conduction state, and the conduction of the transistor 19 causes the light emitting diode 18 to emit light and maintain the display. Therefore,
It is possible to know if the storage battery 9 has been forgotten to be connected. Next, during normal use, if an abnormal temperature rise occurs in the emergency lighting equipment due to a failure of an electrical component, such as a partial short circuit of the check coil 2, a positive characteristic heat sensitive resistor for voltage division is installed in the battery checker. The resistance value of the resistor 15 gradually increases as the temperature rises, and as a result, the voltage divided across the resistor 16 becomes smaller, so that even if the voltage of the storage battery 9 is at a normal value, the voltage V1 is at a low operating point V.

, the light emitting diode 18 emits light through current conduction of the lambda diode 20, indicating an abnormal temperature rise. FIG. 6 shows another embodiment of the present invention, in which a Schmitt circuit including transistors 24 and 25 is used in place of the circuit including the battery checker 1V lambda diode 20 shown in FIG. A normal resistor 26 is used in place of the heat-sensitive resistor 15, a negative characteristic heat-sensitive resistor 27 is used in place of the voltage-dividing resistor 16, and the low operating point V is used in place of the heat-sensitive resistor 15.
. By obtaining the hysteresis operation with the high operating point V1, it is possible to check the battery function, and detect forgetting to connect the battery and abnormal temperature rise. 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 point and return at a high operating point, and the high operating point is selected to be higher than the peak value of the pulsating voltage of the charging circuit's no-load output voltage to give the display operation a memory function. , it has the effect of checking the capacity of the storage battery due to an artificial power outage for a certain period of time and indicating a defective storage battery, and at the same time detecting and displaying the failure to connect the storage battery.The control input terminal of the battery checker is heat-sensitive. A voltage divider circuit that includes a resistor is used to reduce the input voltage divider according to the ambient temperature, so if there is an abnormal temperature rise inside the emergency lighting equipment, this can also be detected and displayed. It has the effect of

[Brief explanation of the drawing]

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 and 5 are respectively explanatory diagrams of the operation of the circuit of FIG. 1, and FIG. 6 is a circuit diagram of another embodiment.

Claims (1)

[Claims] 1 In an emergency light battery checker in which a control input terminal is connected to the output terminal of a charging circuit for charging a storage battery, which is an emergency power source, and the battery checker detects the battery voltage of the storage battery and displays the required display, the low operating point of the hysteresis circuit The display is configured to be activated at a high operating point and inactivated at a high operating point, and this high operating point is selected to be higher than the peak value of the no-load pulsating voltage of the charging circuit, and a heat-sensitive resistor is connected to the control input terminal. A battery checker for emergency lights, characterized in that the input voltage division voltage is reduced according to the ambient temperature using a voltage division circuit including: