JPH09161975A - Emergency lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To light up a discharge lamp by preheating a filament suitably both for the AC mains and a power supply for inverter circuit. SOLUTION: An AC main E is connected parallel with a power supply for an inverter circuit 5, and this parallel circuitry is connected with one-side ends of filaments FL1, FL2. A filament preheat control circuit 13 is connected parallel with one which is for starting a capacitor C11, and this is connected with the other side ends. When the fluorescent lamp concerned FL is ligted up by the AC main E, the preheat time is set by the time constant of a resistance R11 and capacitor C12. When the lamp FL is lignted up by the inverter circuit 5, the preheat time is set by the time constant of a resistance R13 and capacitor C13. The filaments FL1 and FL2 are preheated with the respective appropriate amounts of preheating.

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 for lighting a discharge lamp regardless of whether the AC power supply is out of power or not.

[0002]

2. Description of the Related Art As a conventional emergency lighting device, for example, a structure shown in FIG. 2 is known. In the emergency lighting device having the configuration shown in FIG. 2, the commercial AC power source E is provided with one filament FL1 of the fluorescent lamp FL as the discharge lamp and the other through the inductor L1 as the ballast and the switching circuit 1 as the switching means. Connected to filament FL2.

Between the terminals of the commercial AC power supply E, a constant voltage element Z1 and a primary winding Tr1a of a step-down transformer Tr1 are provided.
Are connected. And commercial AC power supply E
And a triac Q1 is connected between the fluorescent lamp FL,
A capacitor C1 is connected in parallel with the triac Q1. In addition, the gate of this triac Q1 is a resistor
Primary winding of transformer Tr1 through a series circuit of R1, zener diode ZD1 for constant voltage and zener diode ZD2
A capacitor C2 is connected between the middle of Tr1a and between the gate and one end of the triac Q1.

Further, the secondary winding Tr1b of this transformer Tr1
Is connected to the input terminal of the full-wave rectifier 2, and a series circuit of the emitter and collector of the transistor Q2, the resistor R2, and the capacitor C3 is connected between the output terminals of the full-wave rectifier 2. A light emitting diode LED1 for monitoring is connected in parallel. Between the output terminals of the full-wave rectifier 2, a resistor R3, a diode D1, a diode D
2, a series circuit of the fuse F and the battery B is connected, and the connection point of the resistor R3 and the diode D1 is connected to the base of the transistor Q2 via the resistor R4.

Then, the diode D1 and the diode D2
An inverter control circuit 3 is connected between the connection point of 1 and the negative electrode of the full-wave rectifier 2. In this inverter control circuit 3, a parallel circuit of a capacitor C4 and a resistor R5 is connected between the connection point of the diode D1 and the diode D2 and the negative electrode of the full-wave rectifier 2, and the diode D1 and the diode D2 are connected.
Is connected to the base of a transistor Q3 via a resistor R6, and the emitter of this transistor Q3 is a diode D2.
It is connected to the.

Further, a push-pull type inverter circuit 5 is connected to the diode D2. This inverter circuit 5 is connected to the midpoint of the input winding Tr2a of the inverter transformer Tr2 via the choke coil L2, and one end of this input winding Tr2a is the negative electrode of the full-wave rectifier 2 via the emitter and collector of the transistor Q4. The other end of the input winding Tr2a is connected to the negative electrode of the full-wave rectifier 2 via the emitter and collector of the transistor Q5. Also, the input winding Tr
A parallel circuit of a constant voltage element Q6 and a capacitor C6 is connected to 2a. Furthermore, the inverter transformer Tr2 has a control winding Tr2c, and one end of this control winding Tr2c is
The other end of the base of the transistor Q4 is connected to the base of the transistor Q5, the base of the transistor Q4 is connected to the collector of the transistor Q3 via the resistor R7, and the base of the transistor Q5 is connected to the collector of the transistor Q3.

The output winding Tr2b of the inverter transformer Tr2 has one end connected to the filament FL1 of the fluorescent lamp FL via a capacitor C7 and the other end connected to the filament FL2 of the fluorescent lamp FL.

Further, the inverter transformer Tr2 has a filament preheating winding Tr2d and a filament preheating winding Tr2e, and the filament preheating winding Tr2d is connected to the filament FL1 via a current limiting capacitor C8, and the filament preheating winding Tr2d is connected to the filament preheating winding Tr2d. The line Tr2e is connected to the filament FL2 via the current limiting capacitor C9.

Further, the filament FL1 of the fluorescent lamp FL
A series circuit of an inductor L3 and a starter 6 is connected between the filament FL2 and the filament FL2.

When the commercial AC power source E is not shut down,
The voltage of the primary winding Tr1a of the transformer Tr1 is set to the voltage set by the constant voltage element Z1, and the zener diode ZD1 or zener diode ZD2 turns on according to the polarity every time the voltage of the primary winding Tr1a reaches a specified value, and the triac turns on. Turn on Q1, voltage is applied through inductor L1, and starter 6
Fluorescent lamp FL by preheating filaments FL1 and FL2 by
Is turned on.

On the other hand, the voltage is reduced by the transformer Tr1 and full-wave rectified by the full-wave rectifier 2, and the battery B is charged through the resistor R3, the diode D1 and the diode D2. Also, battery B
When the charging voltage is low, a charging current flows and a potential difference occurs in the resistor R3, so that the transistor Q2 is turned on and the light emitting diode LED1 emits light to indicate that charging is in progress. Then, as the charging of the battery B progresses and the current flowing through the resistor R3 becomes smaller and the potential difference of the resistor R3 decreases, the transistor Q2
Is turned off, the light emitting diode LED1 is turned off, and the battery B has been charged.

When the commercial AC power source E is in a non-power failure state, the base of the transistor Q3 is reverse-biased, so that the inverter circuit 5 is not supplied with power and does not operate.

When the commercial AC power source E fails, the voltage of the primary winding Tr1a drops below a predetermined value, the Zener diode ZD1 or the Zener diode ZD2 is in the reverse blocking state, and the triac Q1 is kept in the OFF state. No power is supplied to the fluorescent lamp FL via L1.

Since the reverse bias of the base of the transistor Q3 disappears, the DC power of the battery B is supplied to the inverter circuit 5, and the inverter circuit 5 oscillates at a high frequency to induce a high frequency AC at the output winding Tr2b to generate a high frequency. Then, the fluorescent lamp FL is started and turned on by the starter 6. The output from the inverter circuit 5 is the inductor
Lower than output via L1.

[0015]

However, in the case of the conventional example shown in FIG. 2, the inductor L1 of the commercial AC power source E is
Since the preheating amounts of the filaments FL1 and FL2 of the fluorescent lamp FL are set to be equal regardless of whether the electric power is supplied to the fluorescent lamp FL via the inverter circuit 5 or the electric power is supplied from the inverter circuit 5 to the fluorescent lamp FL. FL1 and FL2 are overpreheated or insufficiently preheated, which causes a problem that the fluorescent lamp FL may become defective or may have a short life.

The present invention has been made in view of the above-mentioned problems, and in any case of using the power of a commercial AC power source or the power of an inverter circuit, the filament is appropriately preheated to light the discharge lamp. An object of the present invention is to provide an emergency lighting device.

[0017]

An emergency lighting device according to claim 1 detects a power failure and a non-power failure of a commercial AC power source,
When the commercial AC power supply is not interrupted, the commercial AC power supply supplies electric power via a normal lighting circuit and charges the battery with the commercial AC power supply. When the commercial AC power supply fails, the DC from the battery is converted into an inverter. In an emergency lighting device, which is converted and supplied by a circuit to preheat a filament of a discharge lamp having a pair of filaments and then lit, a normal lighting circuit and an inverter are provided on one end side of each of the pair of filaments of the discharge lamp. Circuits are connected in parallel, the starter is connected in parallel to the other end of each of the pair of filaments of the discharge lamp, and when the discharge lamp is lit by the normal lighting circuit, the discharge lamp is switched by the inverter circuit. The amount of preheating of the filament of the discharge lamp is changed depending on the time of lighting. In order to simplify the wiring by distributing the power supply source and the starter to the one end side and the other end side of the filament, the discharge lamp is lit by the commercial AC power source, and the inverter is provided. By changing the amount of preheating depending on whether the discharge lamp is lit in the circuit, the filament is appropriately preheated in any case, and overpreheating or insufficient preheating is prevented.

The emergency lighting device according to a second aspect of the present invention detects a power failure and a non-power failure of the commercial AC power source, and supplies the power from the commercial AC power source through the normal lighting circuit when the commercial AC power source is not powered off. Along with charging the battery with the commercial AC power supply, when the commercial AC power supply fails, the DC from the battery is converted and supplied by the inverter circuit, and the filament of the discharge lamp having a pair of filaments is preheated by the starter and then turned on. In the emergency lighting device, the normal lighting circuit and the inverter circuit are connected in parallel to one end of each of the pair of filaments of the discharge lamp, and the starter is provided to the other end of each of the pair of filaments of the discharge lamp. When connected in parallel and lighting the discharge lamp in the normal lighting circuit, When the discharge lamp is lit in the circuit, a control means for changing the preheating time of the filament of the discharge lamp is provided, and a power supply source and a starter are distributed to one end side and the other end side of the filament, respectively. In addition to simplifying the wiring, the preheating time can be changed depending on whether the discharge lamp is lit with a commercial AC power supply or when the discharge lamp is lit with an inverter circuit. To prevent overheating or insufficient preheating.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an emergency lighting device of the present invention will be described below with reference to the drawings. The parts corresponding to those of the conventional example shown in FIG.

The emergency lighting device having the structure shown in FIG.
The commercial AC power supply E is connected to one filament FL1 and the other filament FL2 of a fluorescent lamp FL as a discharge lamp via an inductor L1 as a ballast which is a normal lighting circuit and a switching circuit 1 as switching means. .

Further, a constant voltage element Z1 and a primary winding Tr1a of a step-down transformer Tr1 are provided between both terminals of the commercial AC power source E.
Are connected. And commercial AC power supply E
And a triac Q1 is connected between the fluorescent lamp FL,
A capacitor C1 is connected in parallel with the triac Q1. In addition, the gate of this triac Q1 is a resistor
Primary winding of transformer Tr1 through a series circuit of R1, zener diode ZD1 for constant voltage and zener diode ZD2
A capacitor C2 is connected between the middle of Tr1a and between the gate and one end of the triac Q1.

Further, a control circuit 11 during non-power failure is connected to both ends of the commercial AC power source E. In this non-power failure control circuit 11, a diode D11 and a diode D12 of opposite polarity are connected in series between both terminals of the commercial AC power supply E, and a capacitor C11 and a resistor are connected in parallel to this diode D12.
A series circuit of R11 and capacitor C12 is connected
The connection point of R11 and capacitor C12 is connected to the base of transistor Q11 via resistor R12, and the collector of this transistor Q11 is connected to the connection point of diode D11 and diode D12 via light emitting diode LED11.

The input terminal of the full-wave rectifier 2 is connected to the secondary winding Tr1b of the transformer Tr1.
A series circuit of the emitter and collector of transistor Q2, resistor R2 and capacitor C3 is connected between the output terminals of
A light emitting diode LED1 for monitoring is connected in parallel to the capacitor C3. A series circuit of a resistor R3, a diode D1, a diode D2, a fuse F and a battery B is connected between the output terminals of the full-wave rectifier 2,
The connection point of R3 and the diode D1 is connected to the base of the transistor Q2 via the resistor R4.

Then, the diode D1 and the diode D2
An inverter control circuit 3 is connected between the connection point of 1 and the negative electrode of the full-wave rectifier 2. In this inverter control circuit 3, a parallel circuit of a capacitor C4 and a resistor R5 is connected between the connection point of the diode D1 and the diode D2 and the negative electrode of the full-wave rectifier 2, and the diode D1 and the diode D2 are connected.
Is connected to the base of a transistor Q3 via a resistor R6, and the emitter of this transistor Q3 is a diode D2.
It is connected to the.

A power failure control circuit 12 is connected to the collector of the transistor Q3. This power failure control circuit 12
Is connected between the collector of the transistor Q3 and the negative electrode of the full-wave rectifier 2 in series with a resistor R13 and a capacitor C13. The base of the transistor Q12 is connected to the connection point of the resistor R13 and the capacitor C13 via the resistor R14. , The collector of this transistor Q12 is a light emitting diode
It connects to the collector of transistor Q3 via LED12, and the emitter of transistor Q12 connects to the collector of transistor Q3 via resistor R15.

Further, a push-pull type inverter circuit 5 is connected to the diode D2. This inverter circuit 5 is connected to the midpoint of the input winding Tr2a of the inverter transformer Tr2 via the choke coil L2, and one end of this input winding Tr2a is the negative electrode of the full-wave rectifier 2 via the emitter and collector of the transistor Q4. The other end of the input winding Tr2a is connected to the negative electrode of the full-wave rectifier 2 via the emitter and collector of the transistor Q5. Also, the input winding Tr
A parallel circuit of a constant voltage element Q6 and a capacitor C6 is connected to 2a. Furthermore, the inverter transformer Tr2 has a control winding Tr2c, and one end of this control winding Tr2c is
The other end of the base of the transistor Q4 is connected to the base of the transistor Q5, the base of the transistor Q4 is connected to the collector of the transistor Q3 via the resistor R7, and the base of the transistor Q5 is connected to the collector of the transistor Q3.

The output winding Tr2b of the inverter transformer Tr2 has one end connected to one end of the filament FL1 of the fluorescent lamp FL via the capacitor C7 and the other end connected to one end of the filament FL2 of the fluorescent lamp FL. ing.

Furthermore, the filament FL1 of the fluorescent lamp FL
A filament preheat control circuit 13 as a starter is connected between the other end of the filament FL2 and the other end of the filament FL2, and the control circuit 11 controls the non-power outage control circuit 11, the power outage control circuit 12, and the filament preheat control circuit 13. It constitutes the circuit 14. The filament preheating control circuit 13 connects the collector and emitter of the transistor Q13 between the other end of the filament FL1 and the other end of the filament FL2, and the base of the transistor Q13 is connected to the collector of the transistor Q13 via the resistor R16. At the same time, it is connected to the emitter of the transistor Q13 via the resistor R17. The collector and emitter of the transistor Q14 are connected across the resistor R17, and the resistor R18 is connected between the base and emitter of the transistor Q14. In addition, the base of transistor Q14 is a light emitting diode LED1.
Phototransistor PTr1 photocoupled to 1
Is connected to the other end of the filament FL1 via a series circuit of, and is also connected to the other end of the filament FL1 via a series circuit of a phototransistor PTr2 photocoupled to the light emitting diode LED12.

Next, the operation of the above embodiment will be described.

When the commercial AC power supply E is not interrupted, the voltage of the primary winding Tr1a of the transformer Tr1 is set to the voltage set by the constant voltage element Z1 and the voltage of the primary winding Tr1a follows the polarity every time it reaches a predetermined value. Zener diode ZD1 or zener diode ZD2 is turned on to turn on triac Q1, and voltage is applied via inductor L1.

Further, since the capacitor C12 is not charged when the commercial AC power source E is turned on, the base current is not supplied to the transistor Q11, so that the transistor Q11 also maintains the off state and the light emitting diode LED11 does not light.
Therefore, the phototransistor PTr1 is also turned off,
Since the base current is not supplied to the transistor Q14, the transistor Q14 is in the off state, the base current is supplied to the transistor Q13, and the transistor Q13 is turned on to turn on the fluorescent lamp.
Preheat filaments FL1 and FL2 of FL. In this case, since the light emitting diode LED12 also does not emit light, the phototransistor PTr2 also holds the OFF state. When the capacitor C12 is charged, the base current is supplied to the transistor Q11 and the transistor Q11
Is turned on and the light emitting diode LED11 emits light, the phototransistor PTr1 is turned on, the base current is supplied to the base of the transistor Q14 to bypass the base current of the transistor Q13, and the transistor Q13 is turned off. Discharge is started between the filaments FL1 and FL2 of FL, and the fluorescent lamp FL is started and lit.

On the other hand, the voltage is reduced by the transformer Tr1 and full-wave rectified by the full-wave rectifier 2, and the battery B is charged through the resistor R3, the diode D1 and the diode D2. Also, battery B
When the charging voltage is low, a charging current flows and a potential difference occurs in the resistor R3, so that the transistor Q2 is turned on and the light emitting diode LED1 emits light to indicate that charging is in progress. Then, as the charging of the battery B progresses and the current flowing through the resistor R3 becomes smaller and the potential difference of the resistor R3 decreases, the transistor Q2
Is turned off, the light emitting diode LED1 is turned off, and the battery B has been charged.

When the commercial AC power source E is in the non-power failure state, the capacitor C4 is charged, so that the base of the transistor Q3 is reverse biased, the inverter circuit 5 is not supplied with power and does not operate, and the light is emitted. diode
Since the LED12 does not emit light, the phototransistor PTr2 also keeps the off state.

When the commercial AC power supply E fails, the voltage of the primary winding Tr1a drops below a predetermined value, the zener diode ZD1 or zener diode ZD2 is in the reverse blocking state, and the triac Q1 remains off. No power is supplied to the fluorescent lamp FL via L1. Further, since no voltage is applied to the light emitting diode LED11 from the commercial AC power source E, the light emitting diode LED11 does not emit light and the phototransistor PTr1 also maintains the off state.

Then, since the capacitor C4 is discharged and the reverse bias of the base of the transistor Q3 disappears, the DC power of the battery B is supplied to the inverter circuit 5, the inverter circuit 5 oscillates at a high frequency, and the output winding Tr2b receives a high-frequency AC current. To induce a high frequency.

Since the capacitor C13 is not charged at the beginning of discharging the battery B, the base current is not supplied to the transistor Q12, so that the transistor Q12 also maintains the off state and the light emitting diode LED12 does not light.
Therefore, the phototransistor PTr2 is also turned off,
Since the base current is not supplied to the transistor Q14, the transistor Q14 is in the off state, the base current is supplied to the transistor Q13, and the transistor Q13 is turned on to turn on the fluorescent lamp.
Preheat filaments FL1 and FL2 of FL. Then, when the capacitor C13 is charged, the base current is supplied to the transistor Q12 to turn on the transistor Q12 and the light emitting diode LED12 emits light, so the phototransistor PTr2 is turned on and the base current is supplied to the base of the transistor Q14. By bypassing the base current of the transistor Q13 and turning off the transistor Q13, discharge is started between the filament FL1 and the filament FL2 of the fluorescent lamp FL, and the fluorescent lamp FL is started and lit.

As described above, when the fluorescent lamp FL is turned on by the commercial AC power source E, the resistor R11 and the capacitor C12 are used.
The preheating time is set by the time constant of
Therefore, when the fluorescent lamp FL is turned on, preheating is set by the time constants of the resistor R13 and the capacitor C13, so that the filaments FL1 and FL2 are preheated by appropriate preheating amounts.

The same effect can be obtained by using an inverter circuit instead of the inductor L1.

The preheating is not limited to the case where the preheating current is made the same and the preheating time is changed, but the preheating time is made the same and the current amount is changed to change the preheating amount, or the preheating time and the preheating time are changed. The amount of preheating may be changed by changing both of the electric currents.

[0040]

According to the emergency lighting device of the first aspect of the present invention, the power supply source and the starter are distributed to the one end side and the other end side of the filament to simplify the wiring, and the commercial AC power supply is used. By changing the amount of preheating between when the discharge lamp is turned on and when the discharge lamp is turned on by the inverter circuit, it is possible to preheat the filament appropriately in any case and prevent overpreheating or insufficient preheating.

According to the emergency lighting device of the second aspect,
In the case where the power supply source and the starter are distributed to one end side and the other end side of the filament to simplify the wiring, and the discharge lamp is lit by the commercial AC power source,
By changing the preheating time depending on whether the discharge lamp is turned on by the inverter circuit, the filament can be preheated appropriately in any case, and overpreheating or insufficient preheating can be prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of an emergency lighting device of the present invention.

FIG. 2 is a circuit diagram showing a conventional emergency lighting device.

[Explanation of symbols]

 5 Inverter circuit 13 Filament preheating control circuit as starter 14 Control circuit as control means B Battery E Commercial AC power supply FL Fluorescent lamp as discharge lamp FL1, FL2 Filament L1 Inductor as normal lighting circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Sakata 6-78 Minamimachi, Mishima City, Shizuoka Prefecture Tech Mishima Factory

Claims (2)

[Claims] 1. A power failure and a non-power failure of the commercial AC power supply are detected, and when the commercial AC power supply is not in a power failure, the power from the commercial AC power supply is supplied through a normal lighting circuit and the commercial AC power supply drives a battery. In the emergency lighting device, which is charged and supplies direct current from the battery after being converted by an inverter circuit during a power failure of the commercial alternating-current power supply, and preheats a filament of a discharge lamp having a pair of filaments by a starter, wherein the discharge The normal lighting circuit and the inverter circuit are connected in parallel to one end side of each of the pair of filaments of the lamp, and the starter is connected in parallel to the other end side of each of the pair of filaments of the discharge lamp, the normal lighting circuit When turning on the discharge lamp at
An emergency lighting device comprising a control means for changing the amount of preheating of the filament of the discharge lamp when the discharge lamp is lit by the inverter circuit. 2. A power failure and a non-power failure of the commercial AC power source are detected, and when the commercial AC power source is not in a power failure state, the power from the commercial AC power source is supplied through a normal lighting circuit and the commercial AC power source operates a battery. In the emergency lighting device, which is charged and supplies direct current from the battery after being converted by an inverter circuit during a power failure of the commercial alternating-current power supply, and preheats a filament of a discharge lamp having a pair of filaments by a starter, wherein the discharge The normal lighting circuit and the inverter circuit are connected in parallel to one end side of each of the pair of filaments of the lamp, and the starter is connected in parallel to the other end side of each of the pair of filaments of the discharge lamp, the normal lighting circuit When turning on the discharge lamp at
An emergency lighting device comprising a control means for changing a preheating time of a filament of the discharge lamp when the discharge lamp is lit by the inverter circuit.