JPH04340334A - Emergency light - Google Patents

Abstract

PURPOSE:To realize common use of inverter circuit for normal lighting and emergency lighting. CONSTITUTION:A booster circuit 7 for normally charging a battery B with a commercial power supply AC and boosting the battery voltage upto the driving voltage of an inverter circuit at the time of emergency is constituted of a switched capacitor circuit. The inverter circuit 6 is normally driven with the commercial power supply AC through a rectifying/smoothing circuit 5 to light a discharge lamp FL. At the same time, the voltage is stepped down from E0 to E1 through the step up/down circuit 7 thus charging the battery B through a resistor R3. Upon interruption of the commercial power supply AC, a power interruption circuit 9 detects power interruption to modify the control of the step up/down circuit 7 so that the charging voltage E1 is boosted to E0 thus driving the inverter circuit 6 and lighting the discharge lamp FL.

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 in which power for the emergency lighting is supplied from a commercial power supply in normal times and from a battery in emergencies.

0002

2. Description of the Related Art Generally, emergency lighting devices have a structure in which they are turned on even during normal times. For example, in the conventional emergency lighting device shown in FIG. 17, during normal times, the emergency lighting is switched to a discharge lamp (fluorescent lamp) by a normal lighting circuit 1 composed of a copper-iron ballast.
At the same time as the FL is turned on, battery B of the charging circuit 3, which is an emergency power source, is being charged. In an emergency when the commercial power supply AC is cut off, the battery B is used as a power source to drive the DC-AC inverter of the emergency lighting circuit 2 to continue lighting.

To explain in more detail, when the commercial power supply AC is normal, the contacts Ra, Rb,
Rc is connected to the normally open contact NO side. Therefore, commercial power supply AC → choke coil L1 of normal lighting circuit 1 → contact Ra → one filament F1 of discharge lamp FL → glow starter G and noise prevention capacitor C1 connected in parallel to glow starter G → filament F2 →
Start the discharge lamp FL via the commercial power supply AC route, and then connect the commercial power supply A
The discharge lamp FL is normally turned on through the route C→choke coil L1→contact Ra→discharge lamp FL→commercial power supply AC. At the same time, from commercial power AC to power transformer T, bridge rectifier D
B, battery B is charged via charging resistor R1.

On the other hand, when the commercial power supply AC loses power, charging of the battery B stops, excitation of the power failure detection relay RL also stops, and the relay contacts Ra, Rb, and Rc are connected to the normally closed contact NC side. Then, contact Rc from battery B
The transistor inverter of the emergency lamp lighting circuit 2 starts high-frequency oscillation via the high-frequency oscillation output, and the discharge lamp FL is emergency-lit through the contacts Ra, Rb, and Rc.

The normal lighting circuit 1 shown in FIG. 17 is an example of a copper-iron ballast, but by using an inverter circuit as shown in FIG. 18 in the normal lighting circuit 1, high efficiency and flicker prevention during normal lighting can be achieved. , the weight of the entire emergency lighting equipment can be reduced.

[0006]

[Problems to be Solved by the Invention] However, replacing the normal lighting circuit 1 with an inverter circuit requires two inverter circuits, an inverter circuit for normal lighting and an inverter circuit for emergency lighting, in the emergency lighting device. Therefore, it is desirable to share these two circuits.

The present invention has been proposed in view of the above-mentioned points, and provides an emergency lighting device whose purpose is to share an inverter circuit for normal lighting and an inverter circuit for emergency lighting.

[0008]

[Means for Solving the Problems] The present invention provides an inverter circuit that uses the commercial power source as a power source to light a discharge lamp when the commercial power source is normally available, and an inverter circuit that is charged when the commercial power source is normally available, and in an emergency when the commercial power source is turned off. This emergency lighting device is equipped with a battery that serves as a power source for the circuit, and is provided with a switched capacitor circuit that converts the voltage of the battery into the drive voltage of the inverter circuit in an emergency.

Furthermore, a switched capacitor circuit is used as a step-down circuit that converts the commercial power supply to the battery charging voltage. Furthermore, the step-down circuit for charging the battery and the step-up circuit for converting the battery voltage into the driving voltage for the inverter circuit in an emergency are shared by changing the control method of the switched capacitor circuit.

[0010] Also, the voltage boosting circuit and voltage down circuit described above are used to generate a driving voltage for the inverter circuit from a commercial power source during normal lighting.

[0011]

[Operation] By installing a switched capacitor circuit that converts the battery voltage into the drive voltage of the inverter circuit in an emergency, it is possible to share the inverter circuit for lighting discharge lamps for normal lighting and emergency lighting. The aim is to make the device smaller and lighter. Further, by using a switched capacitor circuit, the circuit can be simplified compared to a case where a DC-DC converter is used.

Furthermore, by changing the control method of the switched capacitor circuit, the switched capacitor circuit acts as a step-down circuit when charging a battery, and when converting into the drive voltage of the inverter circuit in an emergency, the switched capacitor circuit acts as a step-down circuit. The capacitor circuit functions as a booster circuit, and the switched capacitor circuit is used both for charging and for converting the driving voltage of the inverter circuit, thereby simplifying the circuit.

Further, the circuit is simplified by using the above-mentioned step-up circuit and step-down circuit to generate the drive voltage for the inverter circuit from the commercial power supply during normal lighting.

[0014]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a circuit diagram, and FIG. 2 shows an operating waveform diagram. The emergency lighting device of the present invention includes a rectifying and smoothing circuit 5, an inverter circuit 6, a step-up/down circuit 7, a battery circuit 8, a power failure detection circuit 9, a step-up/down circuit control section 10, and the like.

In this embodiment, a power failure detection circuit 9 and a rectification and smoothing circuit 5 are connected in parallel to a commercial power supply AC, and an inverter circuit 6 for lighting the discharge lamp FL that operates with a rectified voltage E0 after rectification and smoothing, and a rectified voltage E0 is the battery charging voltage E1
or the voltage E of charged battery B
A step-up/down circuit 7 that converts the voltage E0 into a driving voltage E0 of the inverter circuit 6 is connected in parallel to the rectifying and smoothing circuit 5.

The operation of the circuit is as follows. That is, when the commercial power supply AC is in a normal state, the inverter circuit 6 is driven via the rectifying and smoothing circuit 5 to light up the discharge lamp FL. At the same time, voltage E0 is changed to E1 by buck-boost circuit 7.
The voltage is stepped down to charge the battery B via the charging resistor R3. On the other hand, in an emergency when the commercial power supply AC is out of power, the power outage detection circuit 9 detects the power outage and changes the control of the buck-boost circuit 7, so that the buck-boost circuit 7 boosts the charging voltage E1 of battery B to E0. , drives the inverter circuit 6 and lights up the discharge lamp FL.

Next, the operation of the step-up/down circuit 7 will be explained in more detail. The buck-boost circuit 7 consists of N capacitors Cn (n=1 to N) of equal capacity, a bidirectional switch S1n that connects one end of the capacitors Cn and Cn+1 so that the capacitors Cn are connected in parallel, and A bidirectional switch S3n connects the other ends of the capacitors Cn and Cn+1, and a switch between Cn and S3n so that the capacitors Cn and Cn+1 are connected in series, and a switch between Cn+1 and S1.
a switched capacitor circuit constituted by N-1 bidirectional switches S2n connected between both ends of the switching capacitor circuit, and a bidirectional switch S1 connected between the switched capacitor circuit and the positive terminal of the rectifying and smoothing circuit 5; It consists of a bidirectional switch S2 connected between the switched capacitor circuit and the battery circuit 8.

The battery circuit 8 is constructed by connecting a charging resistor R3 and a battery B in series, and connecting a bidirectional switch S3 in parallel with the resistor R3. During normal lighting, at time t=t0 to t1 shown in FIG. 2, bidirectional switches S1 and S2n are turned on, bidirectional switches S1n, S3n, S2, and S3 are turned off, and capacitors C1 to CN connected in series are turned on. A voltage E0 is applied. Therefore, each capacitor C1 to CN is E0
/N (=E1).

Next, between time t=t1 and t2, the bidirectional switches S2, S1n, and S3n are turned on. At this time, the capacitors C1 to CN are connected to the bidirectional switch S1n
, S3n are turned on, they are connected in parallel, bidirectional switch S1 is turned off, and S2 is turned on, so that
The parallel-connected capacitors are connected to battery B via charging resistor R3. The battery circuit 8 is therefore charged with voltage E1.

By repeating the operation from time t=t0 to t2 as described above, the switched capacitor circuit works to charge battery B by reducing voltage E0 to 1/N. In an emergency when the commercial power supply AC is out of power, the bidirectional switch S
1n and S3n are turned on, and capacitors C1 to CN are connected in parallel. Furthermore, two-way switches S2, S3
is turned on, battery B is connected to the capacitor Cn connected in parallel, and charges the capacitor Cn.

Next, at time t=t4 to t5,
The bidirectional switches S1n and S3n are turned off and the bidirectional switch S2n is turned on, thereby connecting the capacitors Cn in series. On the other hand, the bidirectional switch S2 is turned off,
Since the bidirectional switch S1 is turned on, the voltage of the series-connected capacitor Cn is connected to the main circuit side, drives the inverter circuit 6, and lights up the discharge lamp FL.

As described above, in an emergency, time t=t3
By repeating the operations from to t5, the step-up/down circuit 7 boosts the battery voltage N times, drives the inverter circuit 6, and lights up the discharge lamp FL. On the other hand, the buck-boost circuit control section 10 shown in FIG.
and J-K flip-flop (CMOS4027) 12
It is made up of etc. This timer IC 11 forms an astable multivibrator circuit, and the rise of this output signal triggers the next stage flip-flop 12.

Therefore, the output O of the flip-flop 12,
OB (B means inversion) outputs a complementary signal that switches between H level and L level in response to the rising signal of the astable multivibrator. Output O of flip-flop 12
AND gate G1 between B and astable multivibrator
The output of O drives the bidirectional switches S1 and S2n, and the AND gate G2 between the output O and the astable multivibrator
The output drives the bidirectional switches S2, S1n, and S3n.

Here, the output O of the flip-flop 12,
By taking the AND output of OB and the astable multivibrator, it is possible to prevent the output O and OB signals from turning on simultaneously and directly connecting the power supply circuit and battery circuit 8. In addition, the power failure detection circuit 9 connects the commercial power supply AC to the resistor R1.
, R2, rectified by a diode D1, and smoothed by a capacitor C0. When the commercial power supply AC is normally used, the output Vin is at H level, and in an emergency, it is at L level. The output V of this power failure detection circuit 9
in is inverted by an inverter gate G3 to drive a bidirectional switch S3.

The buck-boost circuit control section 10 described above generates a signal with a duty ratio of 50% on the outputs O and OB of the flip-flop 12 for switched capacitor control, but it generates a signal with a duty ratio of 50% on the outputs O and OB of the flip-flop 12, but it generates a signal with a duty ratio of 50% on the outputs O and OB of the flip-flop 12. By using it as it is as the O signal of the above embodiment and using the inverted output of the signal O as OB, the duty ratio is changed and the time for connecting the buck-boost circuit 7 to the rectifying and smoothing circuit 5 and the time for connecting it to the battery circuit 8 are changed. You can change the time you do this.

(Embodiment 2) Embodiment 2 is shown in FIG. 4, its operating waveform diagram is shown in FIG. 5, and the circuit diagram of the step-up/down circuit control section 10 is shown in FIG. 6. The present embodiment is characterized in that the switch in the switched capacitor circuit of the previous embodiment was a bidirectional switch, whereas the same operation was realized using a unidirectional switch. The advantage of implementing unidirectional switches is that ordinary bipolar transistors, MOSFETs, etc. can be used for these switches.

The structure and operation of the step-up/down circuit 7 will be explained. The buck-boost circuit 7 includes N capacitors Cn of equal capacitance.
(n=1 to N), and connect one end of Cn and Cn+1 so that the capacitor Cn is connected in parallel. Cn →
Unidirectional switch S1n where current flows in the Cn+1 direction
In parallel with this switch S1n, there is a diode D1n whose current flows in the opposite direction to that of the switch S1n, and a capacitor Cn.
A unidirectional switch S3n through which current flows in the direction Cn → Cn+1 connects the other end of the switch S3n, a diode D3n in which current flows in the opposite direction to switch S3n, and capacitors Cn and Cn+1 are connected in parallel. N-1 Cn →C connected between Cn+1 and S3n and between Cn+1 and S1n.
A switched capacitor circuit composed of a unidirectional switch S2n through which current flows in the n+1 direction, a bidirectional switch S1 connected between the switched capacitor circuit and the positive terminal of the rectifying and smoothing circuit 5, a switched capacitor circuit and a battery circuit 8 It consists of a bidirectional switch S2 connected between the two sides. A charging resistor R3 is inserted between the unidirectional switch S1N-1 and the connection point of Cn and D1N-1.

During normal lighting, the time t=t0 shown in FIG.
~t1, the bidirectional switch S1 and the unidirectional switch S2n are turned on, and the unidirectional switch S1n,
S3n and bidirectional switch S2 are turned off, and voltage E0 is applied to capacitors C1 to CN connected in series. Therefore, each capacitor C1 to CN has E0/
It is charged with a voltage of N (=E1).

Next, between time t=t1 and t2, the bidirectional switch S2 and the unidirectional switch S1n are turned on. At this time, the unidirectional switch S1n of the capacitors C1 to CN is turned on, the bidirectional switch S1 is turned off, and
By turning on the bidirectional switch S2, the capacitors C1 to CN are connected in parallel to the battery B, and the Cn charge of each capacitor is changed to S1n→...S1N→resistance R3→bidirectional switch S2→battery B→diode D3N →... Returns to the capacitor through D3n. The battery circuit 8 is therefore charged with voltage E1.

By repeating the operation from time t=t0 to t2 as described above, the switched capacitor circuit works to charge battery B by reducing voltage E0 to 1/N. In an emergency when the commercial power supply AC is out of power, the switch S2,
S3n is turned on and capacitors C1 to CN are connected in parallel. At this time, from battery B, S2 → D1N
→...D1n→Cn →S3n→...The charge returns to battery B through S3N and charges capacitor Cn.

Next, at time t=t4 to t5,
Switches S2 and S3n are turned off, and switches S2n and S3n are turned off.
1 is turned on, the capacitor Cn is connected in series, and the voltage of the capacitor Cn is connected to the main circuit side, driving the inverter circuit 6 and lighting the discharge lamp FL. As described above, in an emergency, by repeating the operation from time t=t3 to t5, the step-up/down circuit 7 boosts the battery voltage by N times, drives the inverter circuit 6, and lights up the discharge lamp FL.

The switch S1n and diode D1n shown in this example can be replaced with a vertical MOSFET and its built-in diode, and in that case, there is no need to newly add the diode D1n. switch S3n
, Diode D3n is also vertical MOSF
It is possible to replace it with an ET and its built-in diode. On the other hand, the buck-boost circuit control section 10 shown in FIG. 6 forms an astable multivibrator circuit using a timer IC (555, etc.) 11 as in the first embodiment, and the rising edge of this output signal causes the JK flip-flop of the next stage to be activated. Trigger step 12. Therefore, the outputs O, OB of the flip-flop 12
becomes H due to the rising signal of the astable multivibrator.
It outputs a complementary signal that switches between level and L level.

The output of the AND gate G1 between the output OB of the flip-flop 12 and the output of the astable multivibrator drives the switches S1 and S2n, and the output of the AND gate G2 between the output O and the output of the astable multivibrator drives the switches S1 and S2n. Drive S2. In addition, switch S1n
The output to the switches S1 and S2n can basically be the same as the switches S1 and S2n, but since they will not turn on in an emergency, the switches S1 and S2n will not turn on in an emergency.
2n and the output Vin of the power failure detection circuit 9 are applied via an AND gate G5.

Similarly, the output to the switch S3n may be the same as the switch S2, but since it is not turned on during normal lighting, an AND signal by an AND gate G6 is applied to the signal to the switch S2 and the inverted output of Vin. . (Embodiment 3) Embodiment 3 is shown in FIG. 7, its operating waveform diagram is shown in FIG. 8, and the step-up/down circuit control section 10 is shown in FIG. 9. In this embodiment, a power failure detection circuit 9 and a rectifying smoothing circuit 5 are connected in parallel between the commercial power supply AC, and the rectifying voltage E of the rectifying smoothing circuit 5 is
Step-down circuit 1 that converts 0 to battery charging voltage E1
3 is connected. The battery circuit 8 is connected to this step-down circuit 13.
and an inverter circuit 6 that operates with the voltage E1 of the battery circuit 8 are connected in parallel. Furthermore, it includes a step-down circuit control section 14 .

The operation is as follows. When the commercial power supply AC is in a normal state, the voltage E0 rectified and smoothed by the rectifier and smoothing circuit 5 is input to the step-down circuit 13, and the voltage E0 is
0 to E1. The output of the step-down circuit 13 charges the battery B and simultaneously drives the inverter circuit 6 to light the discharge lamp FL. On the other hand, in an emergency when the commercial power supply AC is out of power, the power outage detection circuit 9 detects the power outage and
The switches S1 and S2 are turned off, the inverter circuit 6 is driven by the battery B, and the discharge lamp FL is turned on.

Next, the configuration and operation of the step-down circuit 13 will be described in detail. The configuration is N equal capacitors C
N-1 diodes D are connected between capacitors Cn and Cn+1 so that n (n=1 to N) are connected in series.
2n is connected with the Cn side as an anode and the Cn+1 side as a cathode. Furthermore, N-1 diodes D1n are connected between the capacitor Cn and the diode D2n and between the ground and the ground side, with the ground side being the anode.
1 and the positive side of the power supply, a diode D3n is connected with the power supply side as the cathode.

A switch S1 is connected between the positive side of the rectifying and smoothing circuit 5 and the capacitor C1.
and the positive side of the inverter circuit 6.
has been inserted and configured. The battery circuit 8 has a battery B connected in series to a charging resistor R3 and a switch S3 connected in parallel to the resistor R3, and this battery circuit 8 is connected to a step-down circuit 13 in parallel with an inverter circuit 6. Ru.

The operation is as follows. That is, during normal lighting, at time t=t0 to t1 shown in FIG. 8, the switch S1 is on and the switch S2 is off, charging the capacitor Cn connected in series. The charging path is switch S1 → C1 → D21 → C2 →...
・D2N-1 → CN → Ground. Time t=t1
During discharging as shown in ~t2, turn off the switch S1 and turn on the switch S2, and pass the path from the positive side of the capacitor Cn to the diode D3n-1 → the battery circuit 8 and the inverter circuit 6 → D1n → the negative side of Cn. Therefore, all the capacitors Cn are connected in parallel to reduce the voltage to E0/N (=E1), thereby charging the battery circuit 8 and driving the inverter circuit 6.

Note that the switch S3 of the battery circuit 8
is turned off during charging, and charging resistor R3 is connected to battery B.
Insert in series. On the other hand, in case of emergency, switch S1,
Both S2 are turned off, switch S3 is turned on, and battery B is directly connected to inverter circuit 6, thereby realizing emergency lighting. As shown in FIG.
By combining the J-K flip-flop 12 with an astable multivibrator using a timer IC 11 similar to 2, a complementary pulse signal with a duty ratio of 50% is generated at the outputs O and OB of the flip-flop 12, and the power failure detection signal Vin and NAND gate are generated. By performing AND with AND gates G3 and G4 via G1 and G2, drive signals for switches S1 and S2 are generated only during normal lighting.

Furthermore, by driving the switch S3 with a signal obtained by inverting the power failure detection signal Vin by the inverter gate G5, the charging resistor R is applied to the battery B during charging.
3 are inserted in series, and during discharging, they are directly connected to the inverter circuit 6 without passing through the charging resistor R3. (Embodiment 4) The buck-boost circuit 7 of embodiment 4 is shown in FIG. 10, and its operating waveform diagram is shown in FIG. 11. The overall circuit configuration is the same as that of the first embodiment, except that the operation of the step-up/down circuit 7 is different. In this embodiment, during normal lighting, the commercial power supply A
The inverter circuit 6 is driven by the rectified and smoothed voltage E0 of C, but in an emergency, the inverter circuit 6 is driven with a voltage lower than normal, thereby keeping the output low and extending the duration of the battery B. It is something that can be done.

This can be achieved by reducing the number of series capacitors when boosting the inverter circuit drive voltage from the battery voltage in an emergency. During normal lighting, Figure 1
At time t=t0 to t1 shown in FIG.
1, by turning on S2n (n=1 to N-1), the capacitors C1 to CN are charged in series with the rectified voltage E0. Then, at time t=t1 to t2, by turning on the switches S2, S1n, and S3n,
Capacitors C1 to CN are discharged in parallel, and voltage E0/N is applied to battery circuit 8.

On the other hand, in an emergency, the inverter circuit 6 (N-
When a voltage of k)・E1 (k=any value from 1 to N-1) is applied, the switch S1j (j=1 to k) is always turned on and the switch S2j is turned on to disable the capacitors C1 to Ck. Always off. Then, in order to charge the capacitor in parallel from battery B, time t=t3 to t4
, switches S2, S1m (m=k+1~N
), S3m is turned on, and capacitors Ck+1 to CN are connected to battery B in parallel.

At time t=t4 to t5, the capacitor C is turned on by turning on the switches S1 and S2m.
k+1 to CN are connected in series and a voltage (N-k)·E1 is applied to the inverter circuit 6 to drive it at a voltage lower than that during normal lighting. (Embodiment 5) An embodiment is shown in FIG. 12, and its operation waveform diagram is shown in FIG. 13. The configuration of this example is as follows from Examples 1 and 4 above.
This circuit is constructed by inserting a switch S4 between the step-up/down circuit 7 and the inverter circuit 6 of the circuit. Buck-boost circuit 7
The same applies to Examples 1 and 4. A feature of this embodiment is that the inverter circuit 6 is driven at a voltage lower than the rectified voltage E0 both in normal times and in emergencies.

[0044] In addition, ■ in FIGS. 14(a), (b), and (c),
■ and ■ indicate states of the switched capacitor circuit corresponding to ■, ■, and ■ in FIG. 13, respectively. During normal lighting, power is supplied to the inverter circuit 6 and battery B is charged alternately by the following operations. At time t=t0 to t1 in FIG. 13, switch S1 is turned on and voltage E0 is supplied to the switched capacitor circuit. At this time, the switched capacitor circuit is as shown in FIG.
), capacitors Cn (n=1 to N) are connected in series.

[0045] At time t=t1 to t2, switch S2
is turned on to connect the switched capacitor circuit to the battery circuit 8, and since switch S3 is off, battery B is charged via charging resistor R3. At this time, in the switched capacitor circuit, all capacitors Cn are connected in parallel, as shown in ■ in Fig. 14(b), and E
A voltage of 0/N is supplied to the battery circuit 8.

At time t=t2 to t3, switch S1 is turned on again, and voltage E0 is applied to the switched capacitor circuit.
supply. At this time, the switched capacitor circuit is
As shown by ■ in FIG. 14(a), capacitors Cn are connected in series. At time t=t3 to t4, switch S
4 is turned on, the switched capacitor circuit is connected to the inverter circuit 6, and the discharge lamp FL is lit. At this time, the switched capacitor circuit has a set of two parallel capacitors connected in series, as shown in (■) in FIG. 14(c). Therefore, the voltage of the switched capacitor circuit is E
1.N/2, and a voltage of 1/2 of the smoothed voltage is applied to the inverter circuit 6.

The circuit (■) shown in FIG. 14(c) is a circuit that generates a voltage that is 1/2 of the smoothed voltage. For example, if three capacitors are connected in parallel and these sets are connected in series, A voltage of E1·N/3 can be generated, and a series circuit can also be formed using only capacitors corresponding to the required voltage as in the fourth embodiment. During normal lighting, the above steps are repeated to alternately drive the inverter circuit 6 and charge the battery B.

On the other hand, at the time of emergency lighting, time t=t5 ~
As shown at t6, the switch S2 is turned on to connect the switched capacitor circuit to the battery circuit 8. In an emergency, switch S3 is on and charges the switched capacitor circuit directly from battery B. At this time, the switched capacitor circuit is in the state shown by ■ in FIG. 14(b), and all the capacitors are connected in parallel.

Next, at time t=t6 to t7, switch S4 is turned on and inverter circuit 6 is driven. At this time, the switched capacitor circuit is
, and a voltage of E0/2 is applied to the inverter circuit 6. At the time of emergency lighting, power is supplied from the battery B to the inverter circuit 6 by repeating the above steps. (Embodiment 6) Embodiment 6 is shown in FIG. 15, and its operating waveform diagram is shown in FIG. 16. Similar to Embodiment 4, this embodiment suppresses the output during emergency lighting compared to normal lighting, and
This is accomplished by changing the control frequency of the inverter circuit 6.

In the configuration of this embodiment, a rectifier smoothing circuit 5 and a power failure detection circuit 9 are connected in parallel to the commercial power supply AC, and a buck-boost circuit 7 and an inverter circuit 6 are connected in parallel to the rectifier smoothing circuit 5. . The inverter circuit 6 is controlled by a timer IC (
555 etc.) 15 to switch the transistor Q1 and drive the single-stone inverter circuit 6. By adding a circuit that changes the on time of the timer IC 15 between normal lighting and emergency lighting, the lamp output during normal lighting and emergency lighting is changed.

To explain in more detail, during normal lighting, the output Vin of the power failure detection circuit 9 is at the H level, so its inverted output V1 is at the L level. Therefore, since the secondary side of the photocoupler PC is in the off state, the timer IC
The charging time constant of capacitor C of No. 15 is r1 + r2 and C
The voltage of capacitor C at this time is as shown by Vc in FIG.

[0052] The period during which capacitor C is charged (t=
t0 to t1), the output of timer IC15 is at H level, transistor Q1 is turned on, and collector current Ic
flows as shown in the figure. Next, when the charging voltage Vc of the capacitor C reaches the set value VREF and the capacitor C starts discharging, the output of the timer IC15 becomes L level and the transistor Q1 is turned off. Therefore, a resonant voltage determined by the choke coils L1, L2 and capacitors C1, C2 is applied to the collector voltage VCE of the transistor Q1, and an alternating current due to Ic and VCE flows through the discharge lamp FL. This resonant frequency and timer IC1
If the frequencies of 5 are close, the current and voltage due to resonance will be large, and the lamp current Ila will be large.

On the other hand, in an emergency, the voltage Vin goes to L level, so the inverted output V1 goes to H level. Therefore, the output transistor of the photocoupler PC is turned on, and the charging time constant of the timer IC 15 is changed by the resistor r1.
is determined by capacitor C, and is shorter than normal. Therefore, the on time of the transistor Q1 is also shortened, and the control frequency of the timer IC15 and the resonant frequency are different from each other, so the lamp current Ila becomes smaller than that during normal lighting.
Lamp output is throttled.

In the above embodiment, the inverter circuit 6
Although the explanation was given using a single-stone circuit as an example, a half-bridge circuit, a full-bridge circuit, etc. may also be used. Also,
It goes without saying that two or more discharge lamps can be connected in series or in parallel.

[0055]

Effects of the Invention As described above, the present invention provides an inverter circuit that lights up a discharge lamp using the commercial power source as a power source when the commercial power source is normally available, and an inverter circuit that is charged during the normal commercial power source period and that is connected to the inverter circuit that lights up the discharge lamp using the commercial power source as the power source when the commercial power source is normally available. In an emergency lighting device equipped with a battery as a power source for the circuit, it is equipped with a switched capacitor circuit that converts the voltage of the battery into the drive voltage of the inverter circuit in an emergency.
By installing a switched capacitor circuit that converts the battery voltage into the drive voltage of the inverter circuit in an emergency,
It is possible to share the inverter circuit for lighting the discharge lamp for normal lighting and for emergency lighting, and it is possible to achieve the effect that the device can be made smaller and lighter.

Furthermore, by using a switched capacitor circuit as a step-down circuit for converting the commercial power supply to the battery charging voltage, the circuit can be simplified compared to the case where a DC-DC converter is used. Furthermore, the step-down circuit for charging the battery and the step-up circuit that converts the battery voltage into the drive voltage of the inverter circuit in an emergency are shared by changing the control method of the switched capacitor circuit, so the switched capacitor By changing the circuit control method, the switched capacitor circuit acts as a step-down circuit when charging the battery.
In addition, when converting to the drive voltage of the inverter circuit in an emergency, the switched capacitor circuit acts as a boost circuit, and the switched capacitor circuit is used for both charging and converting the drive voltage of the inverter circuit, simplifying the circuit. can be achieved.

Further, the circuit is simplified by using the above-mentioned step-up circuit and step-down circuit to generate the drive voltage for the inverter circuit from the commercial power supply during normal lighting.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is an operational waveform diagram of FIG. 1;

FIG. 3 is a specific circuit diagram of a buck-boost circuit control section.

FIG. 4 is a circuit diagram of Example 2.

FIG. 5 is an operational waveform diagram of FIG. 4;

FIG. 6 is a specific circuit diagram of a step-up/down circuit control section according to a second embodiment.

FIG. 7 is a specific circuit diagram of Example 3.

8 is an operational waveform diagram of FIG. 7. FIG.

FIG. 9 is a specific circuit diagram of a step-up/down circuit control section of Example 3;

FIG. 10 is a specific circuit diagram of a step-up/down circuit control section according to a fourth embodiment.

FIG. 11 is an operational waveform diagram of FIG. 10;

FIG. 12 is a circuit diagram of Example 5.

FIG. 13 is an operational waveform diagram of FIG. 12;

FIG. 14 is a circuit diagram showing the state of the switched capacitor circuit.

FIG. 15 is a specific circuit diagram of Example 6.

16 is an operational waveform diagram of FIG. 15. FIG.

FIG. 17 is a circuit diagram of a conventional example.

FIG. 18 is a circuit diagram of conventional inverter lighting.

[Explanation of symbols]

5 Rectifier smoothing circuit 6 Inverter circuit 7 Buck-boost circuit 8 Battery circuit 9 Power outage detection circuit AC commercial power supply FL discharge lamp

Claims (4)

[Claims] 1. An inverter circuit that uses the commercial power source as a power source to light a discharge lamp when the commercial power source is normally available, and a battery that is charged during the normal commercial power source period and serves as a power source for the inverter circuit in an emergency when the commercial power source is turned off. What is claimed is: 1. An emergency lighting device comprising a switched capacitor circuit for converting a battery voltage into a drive voltage for an inverter circuit in an emergency. 2. The emergency lighting device according to claim 1, wherein a switched capacitor circuit is used as a step-down circuit for converting a commercial power source to a battery charging voltage. [Claim 3] A claim characterized in that a step-down circuit for charging the battery and a step-up circuit for converting the battery voltage into a driving voltage for the inverter circuit in an emergency are shared by changing the control method of the switched capacitor circuit. The emergency lighting device described in item 1. 4. The emergency lighting device according to claim 1, wherein the step-up circuit and step-down circuit are used to generate a driving voltage for the inverter circuit from a commercial power source during normal lighting.