JP6182392B2 - Emergency lighting control device and emergency lighting device - Google Patents

Description

  The present invention relates to an emergency lighting control device and an emergency lighting device.

  There is an emergency lighting device (also referred to as an emergency lighting device) as lighting for evacuating people in the event of a fire or power outage. Emergency lighting devices include “emergency lights” defined by the Building Standards Act and “guide lights” defined by the Fire Services Act. In these cases, the light source that is turned on in an emergency is a fluorescent lamp or an incandescent lamp such as a mini halogen lamp. Moreover, what uses LED as a light source is also proposed. The emergency lighting device supplies secondary batteries such as Ni-Cd and Ni-MH during normal use (when there is no power failure) in order to supply power to the light source that is turned on during a power failure. .

  FIG. 4 is a block diagram of a conventional emergency lighting apparatus 200 that uses the fluorescent lamp 7. In FIG. 4, an emergency lighting fixture 200 includes an electronic ballast 1 and an emergency lighting control device 2 and is supplied with power from an AC power source E.

  The electronic ballast 1 turns on the fluorescent lamp 7 during normal operation. The electronic ballast 1 includes a line filter 10, a harmonic countermeasure circuit 11, a regular lighting circuit 12, a rectification / inrush current countermeasure circuit 13, a harmonic countermeasure circuit 11, a regular lighting circuit 12, and the like. The emergency lighting control device 2 includes a line filter / rectifying / smoothing circuit 20, an emergency lighting circuit 22, an insulating flyback power supply 23, a charge switching control circuit 24, a power failure detection circuit 25, a photocoupler 25c, a relay contact 26, and a power failure. A storage battery 3 serving as an emergency power source is provided. The line filter / rectifying / smoothing circuit 20 includes a rectifying circuit 20a, a smoothing capacitor 20b, and a line filter 20c. The insulated flyback power supply 23 includes a switching element and a transformer T. The charge switching control circuit 24 has a relay coil 24a. The power failure detection circuit 25 includes a diode 25a and a voltage comparison circuit 25b.

  The operation of the circuit of FIG. 4 will be described. When the AC power supply E is normally supplied, the electronic ballast 1 is supplied with power to the regular lighting circuit 12 via the line filter 10, the rectification / inrush current countermeasure circuit 13, and the harmonic countermeasure circuit 11, and is normally used. The lighting circuit 12 lights the fluorescent lamp 7. At this time, the relay contact 26 for switching the connection of the fluorescent lamp 7 is connected to regular lighting. In FIG. 4, the relay contact 26 is on the emergency side. Further, the emergency lighting control device 2 is configured such that the insulation type flyback power supply 23 (insulation type switching power supply) is a DC power supply from the output of the line filter / rectification smoothing circuit 20 including the line filter 20c, the rectifier circuit 20a, and the smoothing capacitor 20b. Is generated. The insulating flyback power supply 23 has a switching element (not shown), smoothes the DC voltage rectified by the rectifier circuit 20a by the smoothing capacitor 20b, and steps down the voltage by the switching operation of the switching element. The stepped-down DC voltage is output as the output voltage. The charge switching control circuit 24 (charging circuit) charges the storage battery 3 with this DC power supply (output voltage).

  At this time, the charge switching control circuit 24 supplies a voltage to the relay coil 24a built in the charge switching control circuit 24, and the relay contact 26 that connects the circuit to the fluorescent lamp 7 by this voltage is connected to the regular lighting circuit 12. Connect to the side. Depending on the output of the power failure detection circuit 25, the charge switching control circuit 24 supplies a voltage to the relay coil 24a to connect the relay contact 26 to the service lighting circuit 12 and the fluorescent lamp 7, or the emergency lighting circuit 22 and the fluorescence. It controls whether to connect to the lamp 7, charge the storage battery 3, or operate the emergency lighting circuit 22. The power failure detection circuit 25 includes a diode 25a for rectifying the voltage of the AC power supply E and a voltage comparison circuit 25b. The power failure detection circuit 25 monitors the voltage of the AC power source E.

  When the AC power supply E is interrupted by a power failure or the like, the power failure detection circuit 25 detects a voltage (power failure). The charge switching control circuit 24 detects a power failure from the detection voltage of the power failure detection circuit 25 via the photocoupler 25c. When the charge switching control circuit 24 detects a power failure, the emergency lighting circuit 22 is operated by the power of the storage battery 3 and the relay contact 26 is brought into a connection state between the output of the emergency lighting circuit 22 and the fluorescent lamp 7. The fluorescent lamp 7 is turned on via the relay contact 26 at the output of the emergency lighting circuit 22. When the AC power source E is interrupted due to a power failure or the like, the operation of the electronic ballast 1 is stopped. In the fluorescent lamp emergency lighting device, by turning off the switch 4, the power supply to the emergency lighting control device 2 is continued while the fluorescent lamp 7 is turned off without supplying power to the electronic ballast 1. The storage battery 3 can be kept charged.

  The switch 4 refers to a wall switch or the like. The switch 6 is a switch built in the emergency lighting fixture 200, and is a switch that shuts off the AC power source E and simulates the operation at the time of a power failure. The switch 6 is used when checking the operation of the emergency lighting control device 2 or when checking the deterioration of the storage battery 3.

  By the way, the emergency lighting apparatus 200 is technically stipulated by the Fire and Disaster Management Agency notification and the Japan Lighting Industry Association that the emergency lighting apparatus 200 will switch to emergency lighting within 0.5 seconds after the AC power source E is cut off. It is regulated by. According to the Building Standard Law, when the normal power supply is cut off, it is automatically switched to the emergency power supply and connected to the emergency power supply, and when the normal power supply is restored, it is automatically switched to the normal power supply and restored. There is a description that the emergency lighting device is turned on immediately by the storage battery when the normal power source is cut off, and the emergency lighting device is within 0.5 seconds after the normal power source, that is, the AC power source is cut off. It is necessary to light up.

As shown in FIG. 4, in the emergency lighting control device 2, a rectifier circuit 20 a and a smoothing capacitor 20 b are arranged at the input stage of the insulating flyback power supply 23. The power failure detection circuit 25 is provided with a diode 25a. Here, the reason why the diodes 25a are individually arranged in the power failure detection circuit 25 is as follows.
(1) If the power failure detection circuit 25 is connected between the output side of the rectifier circuit 20a and the smoothing capacitor 20b (point A position in FIG. 4), the diode 25a is unnecessary.
(2) However, when the power failure detection circuit 25 is connected to the point A position, it takes time for the voltage at the point A to drop after the AC power source E is cut off because of the smoothing capacitor 20b. For this reason, it is difficult for the power failure detection circuit 25 to detect a power failure after the power is turned off and to switch to emergency lighting within 0.5 seconds.
(3) Therefore, the power failure detection circuit 25 is arranged on the input side of the rectifier circuit 20a that is not affected by the voltage of the smoothing capacitor 20b, and separately from the rectifier circuit 20a for the insulating flyback power source 23, the power failure detection circuit 25 side. A diode 25a is arranged on the front panel and separated. This ensures that the AC power supply E is cut off and switched to emergency lighting within a predetermined time (within 0.5 seconds). However, the connection method of the power failure detection circuit 25 has a problem that the board occupation area becomes large as will be described later.

  The smoothing capacitor 20b installed at the input stage of the insulated flyback power supply 23 in FIG. 4 requires a relatively large capacity for stabilizing the operation. For this reason, the emergency lighting fixture is a capacitor input type, and is a circuit with a bad power factor including many harmonics. In the current JIS standard, the generation limit value of the harmonic current is defined by JISC61000-3-2: 2011, and the lighting apparatus is subject to Class C regulations.

  Therefore, the common electronic ballast 1 is provided with a harmonic countermeasure circuit. In JIS, the regulation is relaxed even in class C in the case of a discharge lamp lighting device having an effective input power of 25 W or less. In addition, the current JIS does not specifically mention lighting of 25 W or less using LED as a light source, but when energy saving is important due to the facilities of the electric power company, when multiple devices are included in the lighting fixture. However, there is a high possibility that regulations will become stricter in the future even if the measured values can be satisfied individually, and even if the light source is not a discharge lamp.

Japanese Patent Laid-Open No. 2001-230090

  As described above, the diode 25a is individually connected to the power failure detection circuit 25 in order to stably operate the isolated flyback power source (insulated switching power source) and to reliably perform the power failure detection and the transition operation to emergency lighting. Is installed. However, since this portion includes many elements on the primary side of the rectifier circuit 20a, the insulation distance according to the standards of the Electrical Appliance and Material Safety Law must be taken wide. For this reason, the occupied area of the board | substrate in an emergency illuminating device becomes large.

  In addition, since a harmonic countermeasure circuit has not been provided on the emergency lighting control device in the related art, there is a concern that the standard cannot be satisfied as an emergency lighting fixture when the regulation of harmonics becomes severe.

  It is an object of the present invention to provide an emergency lighting device that does not increase the area occupied by a substrate and that also satisfies harmonic regulations.

The emergency lighting control device of this invention
A rectifier circuit that rectifies an AC voltage supplied from an AC power source into a DC voltage;
A switching power supply having a switching element, stepping down a DC voltage rectified by the rectifier circuit by a switching operation of the switching element, and outputting the stepped-down DC voltage as an output voltage;
A charging circuit for charging a battery based on the output voltage of the switching power supply;
In an emergency lighting control device comprising a power failure detection circuit for detecting a power failure of the AC power supply,
The switching power supply is
It is connected to the rectifier circuit without passing through a smoothing capacitor, and is an insulating flyback type, and has an active filter that suppresses harmonic current.

  According to the present invention, by eliminating the smoothing capacitor at the input stage of the switching power supply, it is possible to detect a power failure when the AC power supply is shut off without individually installing a diode in the power failure detection circuit. For this reason, the area occupied by the substrate can be reduced by eliminating the diode, and the circuit can be reduced in size. Moreover, the regulation of harmonic current can be satisfied.

FIG. 3 is a circuit block diagram of the emergency lighting fixture 101 according to the first embodiment. FIG. 6 is a circuit block diagram of the emergency lighting fixture 102 according to the second embodiment. FIG. 6 is a circuit block diagram of an emergency lighting apparatus 103 according to a third embodiment. The circuit block diagram of the conventional emergency lighting fixture 200. FIG.

Embodiment 1 FIG.
The emergency lighting fixture 101 of Embodiment 1 is demonstrated with reference to FIG. FIG. 1 is a circuit block diagram of an emergency lighting fixture 101 (emergency lighting device) according to the first embodiment. In the figure, the same functions and parts as those in the circuit block diagram of the conventional emergency lighting apparatus 200 of FIG. The emergency lighting fixture 101 is different from the emergency lighting fixture 200 in the configuration of the emergency lighting control device 2-1.

Differences between the emergency lighting apparatus 101 and the emergency lighting apparatus 200 are as follows.
(1) In the emergency lighting control device 2 of the emergency lighting apparatus 200, the insulated flyback power supply 23 is used. However, in the emergency lighting control device 2-1 of the first embodiment, the insulated flyback power supply 23 is used. This is an isolated flyback power supply 23-1 (switching power supply) with a harmonic countermeasure function to which a harmonic countermeasure function is added. The insulated flyback power supply 23-1 with a harmonic countermeasure function includes, for example, an active filter that suppresses harmonic current as a harmonic countermeasure function. The insulated flyback power supply 23-1 with a harmonic countermeasure function includes a transformer T and a switching element (not shown). The isolated flyback power supply 23-1 with a harmonic countermeasure function, like the isolated flyback power supply 23, steps down the DC voltage rectified by the rectifier circuit 20a by the switching operation of the switching element, and outputs the reduced DC voltage as the output voltage. Output as. The same applies to insulating flyback power supplies 23-2 and 23-3 with a harmonic countermeasure function to be described later. (2) Although the smoothing capacitor 20b is arranged at the input stage of the isolated flyback power supply 23 in FIG. 4, the smoothing capacitor 20b is provided at the input stage of the isolated flyback power supply 23-1 with a harmonic countermeasure function. Does not exist. As shown in FIG. 1, the insulated flyback power supply 23-1 with a harmonic countermeasure function is connected to the rectifier circuit 20a without passing through the smoothing capacitor 20b.
(3) Although the power failure detection circuit 25 is connected to the input terminal of the rectifier circuit 20a in the emergency lighting fixture 200, the power failure detection circuit 25 is connected to the output side of the rectifier circuit 20a in the emergency lighting control device 2-1. doing. As shown in FIG. 1, the power failure detection circuit 25 is connected between the rectifier circuit 20a and an insulated flyback power supply 23-1 with a harmonic countermeasure function.

  The insulated flyback power supply 23-1 with a harmonic countermeasure function may be a control IC used in LED lighting devices that have been actively developed in recent years. The isolated flyback power supply 23-1 with a harmonic countermeasure function has a harmonic suppression function (active filter) that suppresses harmonic current. This is an insulated type with a harmonic countermeasure function described in the second and third embodiments. The same applies to the flyback power supplies 23-2 and 23-3. In the following, an isolated flyback power supply with a harmonic countermeasure function is referred to as an A / F function flyback power supply.

The operation of the emergency lighting fixture 101 will be described.
(1) When the AC power supply E is normally supplied, power is supplied to the flyback power supply 23-1 with an A / F function via the line filter 20c and the rectifier circuit 20a. The flyback power supply 23-1 with an A / F function supplies DC power to a charge switching control circuit 24 (charging circuit) including a relay coil 24a connected to the secondary side, and charging is performed based on the DC power supply. The switching control circuit 24 is charging the storage battery 3.
(2) At this time, the relay contact 26 of the relay coil 24 a operates so as to connect the regular lighting circuit 12 and the fluorescent lamp 7.
(3) The power failure detection circuit 25 acquires the output of the same rectifier circuit 20a as the input of the flyback power supply 23-1 with the A / F function, and “not a power failure” from the voltage comparison circuit 25b via the photocoupler 25c. ”Is input to the charge switching control circuit 24. Therefore, the diode 25a existing in FIG. 4 is not necessary.

(4) When the AC power source E is cut off, the output A point of the rectifier circuit 20a is immediately depleted because there is no smoothing capacitor 20b (FIG. 4), and the power failure detection circuit 25 immediately detects that there is a power failure. A “signal indicating that a power failure has occurred” is input to the charge switching control circuit 24 via the photocoupler 25 c. When a “signal indicating that a power failure has occurred” is input, the charge switching control circuit 24 performs a switching operation to operate the emergency lighting circuit 22 with the power of the storage battery 3 and to connect the relay contact 26 to the emergency lighting circuit 22. The output and the fluorescent lamp 7 are connected so that the fluorescent lamp 7 is lit up.

The emergency lighting control device 2-1 of the first embodiment described above has the following effects.
(1) Since the flyback power supply 23-1 with an A / F function includes an active filter that suppresses harmonic current, an emergency lighting control device in which harmonics are suppressed can be provided.
(2) The smoothing capacitor 20b is eliminated from the input stage of the flyback power supply 23-1 with A / F function, and a power failure is detected at the input stage of the flyback power supply 23-1 with A / F function (the output side of the rectifier circuit 20a). Circuit 25 was connected. For this reason, the power failure detection circuit 25 can immediately detect a power failure, and the primary side element of the rectifier circuit 20a does not enter the power failure detection circuit 25, so that it is not necessary to take a wide insulation distance, thereby increasing the circuit area. Deterrence and downsizing of equipment.
(3) Further, the power failure detection circuit 25 does not need the diode 25a (FIG. 4), and there is an effect of reducing parts.

Embodiment 2. FIG.
The emergency lighting fixture 102 of Embodiment 2 is demonstrated with reference to FIG. FIG. 2 is a circuit block diagram of the emergency lighting fixture 102 (emergency lighting device) according to the second embodiment. In the figure, the same reference numerals are given to the same functions and portions as those in the circuit block diagram of the emergency lighting apparatus 101 of the first embodiment shown in FIG.

The difference between the emergency lighting fixture 102 and the emergency lighting fixture 101 is the difference in configuration between the emergency lighting control device 2-2 and the emergency lighting control device 2-1. Specifically, it is as follows.
(1) In the emergency lighting control device 2-2 of the second embodiment, the power failure detection circuit 25 is connected to the secondary side of the transformer T of the insulated flyback power supply 23-2 (switching power supply).
(2) The emergency lighting control device 2-2 includes a diode 25a.

(3) The transformer T included in the insulating flyback power supply 23-2 has windings N2 and N3 on the secondary side with respect to the winding N1.

  FIG. 2 shows details of the secondary side of the insulated flyback power supply 23-2 with an A / F function. The emergency lighting control device 2-2 smoothes the output of the diode 41 that rectifies the secondary side output of the flyback power supply 23-2 with the A / F function, and the charge switching control circuit 24 and the relay coil. A smoothing capacitor 42 for supplying a stable DC voltage to 24a is provided. There is a diode 25 a at the input of the power failure detection circuit 25.

  In the second embodiment, the power failure detection circuit 25 is arranged at the output on the secondary side of the flyback power supply 23-2 with an A / F function. The flyback power supply 23-2 with an A / F function does not have a large smoothing capacitor (smoothing capacitor 20b in FIG. 4) on its input side, and thus quickly stops operating when the AC power supply E is cut off. However, there is no output at the output A point. Further, since the output point A is not affected by the smoothing capacitor 42, the power failure detection circuit 25 can quickly detect the power failure.

  In the emergency lighting control device 2-2, a winding N3 having a tap on the winding N2 to the main charge switching control circuit 24 is added, and the power failure detection circuit 25 is connected to the winding N3. As shown in FIG. 2, the charge switching control circuit 24 is connected to the winding N2, and the power failure detection circuit 25 is connected to the winding N3. With the configuration shown in FIG. 2, the power failure detection circuit 25 detects a power failure (stop of primary side operation) and charges even if the charge of the smoothing capacitor 42 on the secondary side of the N2 winding is not completely removed. A signal indicating a power failure can be sent to the switching control circuit 24. With this configuration, since the primary side element of the rectifier circuit 20a does not enter the power failure detection circuit 25, the increase in circuit area can be suppressed as in the first embodiment. Moreover, if it detects on the secondary side of the flyback power supply 23-2 with an A / F function, a photocoupler becomes unnecessary. For this reason, the area occupied by the substrate can be made so small that it is not comparable to that when a diode is mounted on the primary side of the transformer T. In addition, since the detection voltage itself of the power failure is small, there is an advantage that the rated voltage / power of the component can be reduced even when the signal is stepped down to an appropriate voltage.

  In the second embodiment, N2 is tapped by winding the N2 winding, but it goes without saying that the same effect can be obtained even if N3 is provided as a tap of the N2 winding.

Embodiment 3 FIG.
With reference to FIG. 3, the emergency lighting fixture 103 of Embodiment 3 is demonstrated. FIG. 3 is a circuit block diagram showing the emergency lighting fixture 103 (emergency lighting device) of the third embodiment. In the figure, the same reference numerals are given to the same functions and portions as those in the circuit block diagram of the emergency lighting apparatus 102 of the second embodiment shown in FIG.

The difference between the emergency lighting fixture 103 and the emergency lighting fixture 102 is the difference in configuration between the emergency lighting control device 2-3 and the emergency lighting control device 2-2. Specifically, it is as follows.
(1) The winding configuration of the transformer T included in the insulation type flyback power supply 23-3 (switching power supply) of the emergency lighting control device 2-3 is the winding configuration of the transformer T included in the insulation type flyback power supply 23-2. And different.
(2) The emergency lighting control device 2-3 includes a diode 51 instead of the diode 25a of the emergency lighting control device 2-2.

  In FIG. 3, the details of the structure of the transformer T are shown in the frame showing the insulated flyback power supply 23-3 with A / F function. In the flyback power supply, the primary winding N1 and the secondary winding N2 are wound in opposite directions in order to make the output voltage constant, but the tertiary winding in the same direction as the primary side. By winding N3, the output of the power supply voltage of the input voltage with a turn ratio of N1: N3 can be taken out to the N3 output. Using this principle, it is possible to detect how many volts the input voltage is. A diode 51 is added to the output of the N3 winding and is input to the power failure detection circuit 25 via the diode 51.

  According to the above-mentioned notification by the Fire Department and the technical standards established by the Japan Lighting Industry Association, it is stipulated that the lighting should be switched to emergency lighting within 0.5 seconds after the power is turned off. In addition to this, “When the voltage is dropped, if the voltage is 85% or more of the rated voltage, it will not switch to emergency lighting, and the voltage will be 40% or more and 85%. When it is less than the limit, the switch to emergency lighting ”and“ the power supply voltage to switch to emergency lighting ”are regulated.

  In the third embodiment, the input voltage applied to the primary winding N1 can be taken out as it is by winding the N3 winding in the same direction as the N1 winding. For this reason, in addition to the effect of the second embodiment, there is an effect that the switching voltage to be switched to emergency lighting can be accurately detected. Therefore, the reliability of the switching voltage of the emergency lighting fixture 103 can be improved.

  In the above first to third embodiments, the case where the fluorescent lamp 7 is used as the light source of the emergency lighting fixture is described. However, the contents described in the first to third embodiments are not limited to the case where a fluorescent lamp is used as a light source, but an emergency lighting apparatus that uses an LED as a light source for normal use and a fluorescent lamp as a light source for emergency However, it may be an emergency lighting device that uses an LED as a light source during normal use and emergency. Even when the relay contact is not required, it has a function of charging the storage battery and can be applied to all emergency lighting fixtures using an insulating flyback power source.

  E AC power source, 1 Electronic ballast, 2,2-1, 2-2, 2-3 Emergency lighting control device, 3 Storage battery, 4 Switch, 7 Fluorescent lamp, 10 Line filter, 11 Harmonic countermeasure circuit, 12 Common use Lighting circuit, 13 Rectifier / rush current countermeasure circuit, 14 Control circuit, 20 Line filter / rectifier smoothing circuit, 20a Rectifier circuit, 20b Smoothing capacitor, 22 Emergency lighting circuit, 23 Insulated flyback power supply, 23-1, 23 -2, 23-3 Insulated flyback power supply with harmonic countermeasure function, 24 charge switching control circuit, 24a relay coil, 25 power failure detection circuit, 25a diode, 25b voltage comparison circuit, 25c photocoupler, 26 relay contact, 101, 102,103,200 Emergency lighting equipment.

Claims (3)

A rectifier circuit that rectifies an AC voltage supplied from an AC power source into a DC voltage;
A switching power supply having a switching element, stepping down a DC voltage rectified by the rectifier circuit by a switching operation of the switching element, and outputting the stepped-down DC voltage as an output voltage;
A charging circuit for charging a battery based on the output voltage of the switching power supply;
In an emergency lighting control device comprising a voltage comparison circuit which is a power failure detection circuit for detecting a power failure of the AC power supply,
The switching power supply is
Is connected to the rectifier circuit without passing through the smoothing capacitor, an insulated flyback, it has a harmonic-suppression function of suppressing a harmonic current,
The voltage comparison circuit includes:
The emergency lighting control device characterized in that the DC voltage rectified by the rectifier circuit is input without passing through a diode, and the power failure is detected by the input DC voltage . The switching power supply is
Have a transformer,
The voltage comparison circuit includes:
The emergency lighting control device according to claim 1, wherein a power failure of the AC power supply is detected by connecting between the rectifier circuit and the switching power supply. An emergency lighting device comprising the emergency lighting control device according to claim 1 .

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