JPH11307280A - Emergency lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and inexpensive emergency lighting system capable of reliably detecting a load condition such as no load condition and a condition at the end of its life, at normal times and in case of emergency. SOLUTION: This emergency lighting system consists of a normal lighting circuit 2 to light a fluorescent lamp FL with a commercial power supply 1 as a power source, an emergency lighting circuit 5 to light the fluorescent lamp FL in a modulated light condition in case of emergency with a secondary battery 4 as a power source, a power failure detecting circuit 6 to detect whether the commercial power supply 1 fails or not, and a switching circuit 7 to switch the fluorescent lamp FL to the emergency lighting circuit 2 and the emergency lighting circuit 5 by the output of the power failure detecting circuit 6. A detecting circuit 8 to detect an abnormal condition of a load is connected to the load side of the switching circuit 7, a discriminating circuit 9 to judge if the load is in an abnormal condition by the output of the detecting circuit 8 is provided on the emergency lighting circuit 5 side, and the threshold of the discriminating circuit 9 is switched by the output of the power failure detecting circuit 6 depending on normal times and an emergency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency lighting device which is always lit by a commercial power supply and lit by a secondary battery in an emergency such as a power failure.

[0002]

2. Description of the Related Art Conventionally, a structure as shown in FIG. 12 is used as an emergency lighting device for turning on a fluorescent lamp in an emergency such as a power failure. Always from commercial power supply 1 to charging circuit 3
, The fluorescent lamp FL is lit at a high frequency by a regular lighting circuit 2 using a commercial power supply 1 as a power source, and in the event of an emergency such as a power failure, a power failure detection circuit 6 detects the power failure and a switching circuit. 7, the fluorescent lamp FL, which is a load, is switched to the emergency lighting circuit 5 side, and the light output is reduced so that the emergency lighting circuit 5 using the secondary battery 4 as a power source can secure the minimum brightness of the fluorescent lamp FL. It is configured to be lit at a high frequency in the dimming state.

[0003] The fluorescent lamp FL is characterized in that the emitter, which is a thermionic emission material, applied to the filament at the end of its life is eliminated, and the impedance of the load changes. When the load is abnormal, such as at the end of the life of the fluorescent lamp or in a no-load state (a state in which the lamp is disconnected), the load state is detected and the oscillation of the lighting device is stopped or intermittently oscillated to output. Conventionally, it is common practice to apply high voltage when no load is applied to parts and sockets, and to prevent overheating at the end of lamp life and abnormal rise in lighting device temperature. I have.

As an example of the detection circuit, as shown in FIG. 13, a method of detecting a voltage obtained by stepping down a high-frequency lamp voltage by a transformer T1, smoothing a full-wave rectified voltage and converting the voltage into a direct current,
As shown in FIG. 14, a method of detecting a lamp current with a current transformer CT1 or the like is used. In these methods, when the impedance of the lamp at the end of its life changes and the lamp voltage or the lamp current exceeds a certain value, the discrimination circuit judges that the lamp has reached the end of its life and performs control such as stopping oscillation.

[0005]

However, in the emergency lighting device, as shown in FIG. 12, a lighting circuit 2 using a commercial power supply 1 as a power supply and a dimming state in which the light output is reduced using a secondary battery 4 as a power supply in an emergency. Since the lighting circuits 5 that are lit by the lighting circuit 5 are different, the detection circuits 8a and 8b and the discriminating circuits 9a and 9b must be provided in the normal lighting circuit 2 and the emergency lighting circuit 5, respectively.
As a result, the number of components is increased, so that there is a problem that the lighting device is increased and the cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to enable a load state such as no load or end of life to be reliably detected at all times and in an emergency. And a low-cost emergency lighting device.

[0007]

According to the present invention, in order to solve the above-mentioned problems, as shown in FIG.
Lighting circuit 2 for lighting the fluorescent lamp FL using the power supply
And a charging circuit 3 connected in parallel with the regular lighting circuit 2 to always charge the secondary battery 4 and use the secondary battery 4 as a power source in an emergency to reduce the light output from the fluorescent lamp in a dimmed state. An emergency lighting circuit 5 for lighting the FL; a power failure detection circuit 6 for detecting whether the commercial power supply 1 is energized or a power failure in the event of an emergency such as a power failure; 2 and a switching circuit 7 for switching to an emergency lighting circuit 5, a detection circuit 8 for detecting a load abnormality is connected to the load side of the switching circuit 7, and the output of the detection circuit 8 detects a load abnormality. A judgment circuit 9 for judging is provided on the emergency lighting circuit 5 side, and the threshold value of the judgment circuit 9 is switched between the normal state and the emergency state by the output of the power failure detection circuit 6.

[0008]

(Embodiment 1) FIG. 1 is a block diagram showing the overall configuration of Embodiment 1 of the present invention. The commercial lighting circuit 2 and the charging circuit 3 are connected in parallel with the commercial power supply 1, and the output of the regular lighting circuit 2 is connected to the fluorescent lamp FL via the switching circuit 7, and is normally used when the commercial power supply 1 is energized. The lighting circuit 2 turns on the fluorescent lamp FL. Charge circuit 3
Always charges the secondary battery 4. The power failure detection circuit 6 detects the presence or absence of the commercial power supply 1 and operates the emergency lighting circuit 5 and the switching circuit 7 in an emergency such as a power failure.
The fluorescent lamp FL is switched to the emergency lighting circuit 5 side. The emergency lighting circuit 5 uses the rechargeable battery 4 as a power source, and the output is connected via the switching circuit 7 to the same fluorescent lamp FL as in normal use. In an emergency such as a power failure, the emergency lighting circuit 5 operates according to the signal of the power failure detection circuit 6,
The fluorescent lamp FL is turned on in a dimming state.

A detection circuit 8 for detecting a load state is connected to the switching circuit 7 on the load side. For example, as shown in FIG. 13, the circuit is connected in parallel with the fluorescent lamp FL and detects the lamp voltage. The output signal of the detection circuit 8 is input to a discrimination circuit 9, which discriminates whether the load state is normal or abnormal, and outputs a signal to the regular lighting circuit 2 and the emergency lighting circuit 5,
When an abnormality occurs, the lighting circuits 2 and 5 are stopped.

FIGS. 2 to 4 show specific circuit configurations of this embodiment.
Shown in As shown in FIG. 2, the regular lighting circuit 2 is a lighting circuit having a half-bridge configuration including transistors Q1 and Q2.
Is rectified and smoothed, and the transistor Q
1 and Q2 are alternately turned on at a high frequency, and the fluorescent lamp FL
Is turned on at high frequency. C1 is a DC cut capacitor,
C2 is a preheating capacitor, and L1 is a ballast choke. The output of the regular lighting circuit 2 is connected to the fluorescent lamp FL via switching circuits 71 to 74 including relays and the like.
Outputs a, b and d of the emergency lighting circuit shown in FIG. 3 are connected to terminals a, b and d of the switching circuits 71 to 74, respectively. The switching circuit 75 is linked to the switching circuits 71 to 74, and connects the secondary battery 4 to the emergency lighting circuit and supplies the power supply voltage Vcc to the detection circuit in the event of a power failure.

Next, the configuration of the detection circuit will be described.
A transformer T1 is connected in parallel with the fluorescent lamp FL of FIG. 2, and a voltage obtained by stepping down the lamp voltage and performing full-wave rectification is supplied to terminals e and G.
Obtained in between. A capacitor C6 shown in FIG. 4 is connected between the terminals e and G, and a smoothed DC voltage is obtained at both ends of the capacitor C6. A voltage CP obtained by dividing the DC voltage by the resistors R2 and R3 is compared with a reference voltage Vr by a comparator CP1. Normally, the signal A of the power failure detection circuit 6 is at the high level, and the transistor Q6 is turned on. As a result, the reference voltage Vr becomes a voltage divided by the parallel resistance of the resistors R5 and R6 and the resistor R4.

When the load enters an abnormal state such as the end of life, the detection voltage Vs increases in proportion to the increase in the lamp voltage. When the detection voltage Vs becomes higher than the reference voltage Vr, the output of the comparator CP1 changes from the Low level to the High level, the transistor Q5 is turned on, the current flows through the light emitting diode PD1, the phototransistor PT1 is turned on, and the ordinary lighting circuit is turned on. Since the gates and sources of the two transistors Q1 and Q2 are short-circuited, the oscillation of the ordinary lighting circuit 2 stops.

The emergency lighting circuit is a push-pull lighting circuit composed of transistors Q3 and Q4 as shown in FIG.
2 is a constant current inductor, R1 is a bias resistor, T2 is a leakage transformer, C3 is a resonance capacitor, C4 is a current limiting capacitor, and C5 is a preheating capacitor. The transistors Q3 and Q4 oscillate at a high frequency through the feedback winding N4 due to the resonance current between the resonance capacitor C3 and the primary winding N1 of the leakage transformer T2, and in a dimming state where the optical output is lower than usual. It is lit. Secondary winding N2
And the output of the preheating winding N3 are the terminals a of the switching circuits 71 to 74,
It is connected to the fluorescent lamp FL via b and d. The base potential of the transistor Q3 is supplied from the terminal h to the diode D
1 is connected to the collector of the transistor Q5. When the transistor Q5 is turned on, the transistor Q5 is turned on.
3 is turned off, and the emergency lighting circuit stops.

When the load becomes abnormal at the end of life or the like in an emergency, the lamp voltage rises. However, in an emergency, the lamp is lit and dimmed. Since the lamp voltage is higher in proportion to the level of the lamp and the lamp voltage of the lamp FL at the end of its life is higher than that in the normal state, it is necessary to increase the detection threshold. In this embodiment, in an emergency, the signal A of the power failure detection circuit 6 is inverted to Low level, and the transistor Q6 is off. Therefore, the reference voltage Vr is a partial voltage of the resistors R4 and R6 and is higher than usual, so that the threshold level of detection is increased, and it is possible to detect the voltage reliably.

FIG. 14 shows a method for detecting the load state.
As described above, there is a method of detecting the lamp current with the current transformer CT1. When the lamp current is detected, the lamp current changes as shown in FIG. 6 with respect to the dimming level. Therefore, in this case, the detection level at all times needs to be higher than in an emergency. Therefore, the signal A of the power failure detection circuit 6 is inverted at all times and in an emergency so that the reference voltage Vr is always higher than in an emergency. Thus, the threshold of the detection level is always higher.

As shown in FIG. 7, transistors Q7,
When a latch circuit including resistors R10 to R13 and diodes D2 and D3 is added, if the detection circuit operates as described above when the load is in an abnormal state, the output of the comparator CP1 goes high and the transistor Q5 turns on. And
Similarly to the above, the oscillation of the constant lighting circuit 2 and the emergency lighting circuit 5 is stopped, and the transistor Q7 is turned on and the base current of the transistor Q5 is continuously supplied. 2, 5 continue the oscillation stop. The latch can be released by replacing the lamp FL at the same time that the secondary battery 4 is disconnected.

As described above, according to the present invention, the detection circuit 8 can be shared, and the state of the load can be reliably detected always and in an emergency.

(Embodiment 2) FIG. 8 shows a main circuit configuration of Embodiment 2 of the present invention. The configuration of the other parts is the same as in FIGS. 2 and 3 of the first embodiment. When a load abnormality is constantly detected and the power is turned on / off while the latch circuit including the transistors Q7 and Q12 is operating, the signal A of the power failure detection circuit 6 is inverted. That is, as shown in FIG. 9, when current is supplied, the signal A is at the low level, the transistor Q10 is turned on, the transistor Q11 is turned off, and the transistor Q8 is turned off.

If the load is abnormal and the output of comparator CP1 is H
When the transistor goes to the high level, the transistor Q5 turns on, a current flows through the light emitting diode PD1, and the transistor Q1,
Q2 is turned off, the oscillation of the ordinary lighting circuit 2 is stopped, and the transistor Q7 of the latch circuit is also turned on, so that the transistor Q5 continues to be turned on, so that the oscillation stop is maintained. When the commercial power supply 1 is turned off in this state, the signal A of the power failure detection circuit 6 goes high and the transistor Q
8 is turned on, transistor Q5 is turned off, and transistor Q5 is turned off.
Since 7 is also turned off, the latch is released.

Similarly, in an emergency, the signal A of the power failure detection circuit 6 is at the high level, the transistor Q9 is turned on, and the transistor Q10 is turned off. Detects load abnormalities,
When the output of the comparator CP1 becomes High level, the transistor Q11 turns on, the transistors Q3 and Q4 turn off, the oscillation of the emergency lighting circuit 5 stops, and the latch circuit by the transistor Q12 operates, and the oscillation stop is maintained. . When the signal A of the power failure detection circuit 6 goes low during power recovery, the transistor Q10 is turned on and the transistor Q11 is turned off, so that the latch is released.

As described above, in this embodiment, the load abnormality can be individually detected at all times by using the common detection circuit for the normal operation and the emergency operation. In the event of an emergency, the power can be released by restoring the power, and can be released by turning on / off the commercial power at all times.

Third Embodiment FIG. 10 shows a third embodiment of the present invention. When the wall switch 10 is provided to the input power supply of the regular lighting circuit 2 and the fluorescent lamp FL can be arbitrarily blinked at all times when the commercial power supply 1 is energized, whether the fluorescent lamp FL is extinguished with no load or whether the wall is The switch 10 cannot determine whether the light is turned off. Therefore,
In this embodiment, a light-off detection circuit 11 for determining whether the light is turned off by the wall switch 10 is added, and the detection circuit 8 does not operate when the light is turned off by the wall switch 10.

Specifically, as shown in FIG.
And a series circuit of a light-emitting diode PD2 is connected in parallel with the contact. When the contact of the wall switch 10 is open, no power is supplied to the regular lighting circuit 2 and the fluorescent lamp FL is turned off. At this time, if the commercial power supply 1 is energized, a current flows through the light emitting diode PD2 and the phototransistor PT2 is turned on, so that the detection voltage Vs is short-circuited, and the detection circuit 8 does not operate. Further, even when the oscillation stop is held by the transistor Q7 of the latch circuit, the output of the comparator CP1 becomes Low level because the detection voltage Vs becomes substantially 0 V, the transistor Q5 turns off and the latch is released. .

When the contact of the wall switch 10 is closed, power is supplied to the ordinary lighting circuit 2, so that the fluorescent lamp FL is turned on. At this time, the light emitting diode PD2
Since no current flows through the photo transistor PT2, the phototransistor PT2 is turned off, and the phototransistor PT2 can be detected. Also, in an emergency, no current flows through the light emitting diode PD2 regardless of the state of the wall switch 10, so that the detection circuit 8 becomes operable. The configuration of the other parts is the same as in FIGS. 2 and 3 of the first embodiment.

As described above, in this embodiment, it is possible to determine whether the load state is no load or off by detecting the off state of the lamp FL at all times, and to release the latch at all times. This can be done with the wall switch 10.

[0026]

According to the first aspect of the present invention, the load abnormality detection circuit can be shared by the normal lighting circuit and the emergency lighting circuit, so that the size and cost of the emergency lighting device can be reduced. In addition to this, there is an effect that the abnormality of the load can be reliably detected always and in an emergency.

According to the second aspect of the present invention, the state in which the oscillation is stopped and held when the load abnormality is detected can be released by returning the power in an emergency, and the commercial power supply is normally turned on and off. It can be released.

Further, according to the third aspect of the present invention, it is possible to determine whether the load is in a no-load state or a non-light-off state by detecting the lamp-off state at all times, and to always hold the oscillation stop. There is an effect that the state can be released by the wall switch.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a regular lighting circuit and its peripheral circuits according to Embodiments 1 to 3 of the present invention.

FIG. 3 is a circuit diagram of an emergency lighting circuit and peripheral circuits according to the first to third embodiments of the present invention.

FIG. 4 is a circuit diagram of a detection circuit and a determination circuit according to the first embodiment of the present invention.

FIG. 5 is a characteristic diagram showing a relationship between a lamp voltage of a load used in the present invention and a luminous flux ratio.

FIG. 6 is a characteristic diagram showing a relationship between a lamp current of a load used in the present invention and a luminous flux ratio.

FIG. 7 is a circuit diagram of a modification of the detection circuit and the determination circuit according to the first embodiment of the present invention.

FIG. 8 is a circuit diagram of a detection circuit and a determination circuit according to a second embodiment of the present invention.

FIG. 9 is an operation explanatory diagram of the second embodiment of the present invention.

FIG. 10 is a block diagram illustrating an entire configuration of a third embodiment of the present invention.

FIG. 11 is a circuit diagram of a detection circuit and a determination circuit according to a third embodiment of the present invention.

FIG. 12 is a block circuit diagram showing a configuration of a conventional emergency lighting device.

FIG. 13 is a circuit diagram showing a configuration of a conventional lamp voltage detection circuit.

FIG. 14 is a circuit diagram showing a configuration of a conventional lamp current detection circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 Regular lighting circuit 3 Charging circuit 4 Secondary battery 5 Emergency lighting circuit 6 Power failure detection circuit 7 Switching circuit 8 Detection circuit 9 Discrimination circuit

Claims (3)

[Claims] An ordinary lighting circuit for lighting a fluorescent lamp using a commercial power supply as a power supply, and a charging circuit connected in parallel with the ordinary lighting circuit always charges the secondary battery, and always uses the secondary battery as a power supply in an emergency. An emergency lighting circuit that lights the fluorescent lamp in a dimmed state with a lower light output than that of a power failure detection circuit that detects whether the commercial power supply is energized or a power failure occurs in an emergency such as a power failure, and a power failure detection circuit In an emergency lighting system consisting of a switching circuit that switches a fluorescent lamp between a regular lighting circuit and an emergency lighting circuit according to the output, a detection circuit that detects an abnormality in the load is connected to the load side of the switching circuit, and the load of the load is detected by the output of the detection circuit. An emergency lighting device characterized in that a judgment circuit for judging an abnormality is provided on an emergency lighting circuit side, and a threshold value of the judgment circuit is switched between a normal state and an emergency state by an output of a power failure detection circuit. . 2. The emergency lighting device according to claim 1, wherein the determination circuit is reset by an output of the power failure detection circuit. 3. The emergency lighting device according to claim 2, wherein the power supply is made of three wires, and the common lighting circuit can be turned on and off by a wall switch at all times, and a turn-off detection circuit for detecting on / off of the wall switch is provided. An emergency lighting device characterized in that the judgment circuit is reset when the light is turned off.