JP2013246938A - Illuminating device, and illuminating fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately lighten a light source even in a high-temperature atmosphere.SOLUTION: An emergency illuminating device comprises a light source 1, an accumulator battery 2, a charging circuit 3, a regular-use lighting circuit 4, an emergency lighting circuit 5, a switching part 6, and the like. In addition, the emergency lighting circuit 5 comprises a push-pull inverter circuit 50, a full-wave rectifier 51 consisting of a diode bridge, a smoothing capacitor 52, and the like. Since the emergency lighting circuit 5 is configured of a self-excited oscillation type switching power supply (the push-pull inverter circuit 50), the light source 1 can be appropriately lightened even in the high-temperature atmosphere compared with the case that an IPD or a control IC or the like is used.

Description

  The present invention relates to a lighting device and a lighting fixture.

  As a conventional lighting device, for example, there is an emergency lighting device described in Patent Literature 1 and Patent Literature 2. These conventional examples charge the storage battery while turning on the light source with the power (AC power) supplied from the normal power supply (commercial AC power supply), and the power discharged from the storage battery when the power supply to the normal power supply stops (power failure) The light source is kept on with (DC power).

  Here, the emergency lighting device is stipulated in the standard of the Japan Lighting Equipment Manufacturers Association (JIL5501 <emergency lighting equipment technical standards>) to light the light source effectively for a predetermined time in an atmosphere of 140 ° C. ing. When the light source is a halogen lamp, a control circuit for controlling power supply from the storage battery to the light source is unnecessary, and therefore, it is easy to satisfy the above-mentioned standard.

  On the other hand, in recent years, lighting devices using light emitting diodes as light sources instead of halogen lamps or fluorescent lamps are increasing, and various emergency lighting devices using light emitting diodes as light sources have been proposed (for example, see Patent Document 3). ).

JP 2008-166165 A JP 2011-34977 A JP 2006-210238 A

  Here, when a light emitting diode is used as a light source, a plurality of light emitting diodes are often connected in series in order to obtain a light amount necessary for emergency lighting. Then, since the voltage (rated voltage) to be applied to the series circuit of the light emitting diodes is a voltage obtained by multiplying the forward voltage of the light emitting diodes by the number connected in series, there is a boost circuit for boosting the battery voltage of the storage battery. Necessary.

  On the other hand, in order to reduce the number of components and simplify the control circuit, a lighting device that lights a light emitting diode is a device that integrates a switching element and a control circuit that controls the switching of the switching element (Intelligent Power Device: IPD) and dedicated control ICs are often used. However, circuit components such as IPDs and control ICs may stop operating or malfunction due to the built-in temperature protection function in a high-temperature atmosphere, and can be used for emergency lighting devices. difficult.

  The present invention has been made in view of the above problems, and an object thereof is to appropriately light a light source even in a high temperature atmosphere.

  The lighting device of the present invention includes a light source, a storage battery, a charging circuit that charges the storage battery with power supplied from an external power source, a regular lighting circuit that lights the light source with power supplied from the external power source, An emergency lighting circuit for lighting the light source with electric power discharged from a storage battery; and while the external power source is being fed, the emergency lighting circuit is powered by the light source to be lit, while the external power source is being powered off, Switching means for supplying power to the light source from a lighting circuit and lighting it, and the emergency lighting circuit is composed of a self-oscillation type switching power supply.

  In this illuminating device, the light source is lit by DC power, and the switching means includes a first diode inserted in a power supply path from the normal lighting circuit to the light source, and the light source from the emergency lighting circuit. It is preferable to have a second diode inserted in the power supply path to the.

  In this illuminating device, it is preferable that the switching unit does not supply power to the light source from the emergency lighting circuit while power supply to the regular lighting circuit is continued even when power supply to the external power supply is stopped.

  In this lighting device, it is preferable that the switching unit does not supply power to the light source from the normal lighting circuit while the power supply of the emergency lighting circuit continues even when the power supply of the external power supply is resumed.

  The lighting fixture of the present invention includes any one of the lighting devices and a fixture main body that holds the lighting device and is attached to an attachment surface.

  Since the emergency lighting circuit is composed of a self-excited oscillation type switching power supply, the lighting device and the lighting fixture of the present invention are in a high-temperature atmosphere as compared with the case where an IPD or a control IC is used. There is also an effect that the light source can be appropriately turned on.

It is a circuit block diagram which shows Embodiment 1 of the illuminating device which concerns on this invention. It is a circuit block diagram which shows Embodiment 2 of the illuminating device which concerns on this invention. It is a circuit block diagram which shows Embodiment 3 of the illuminating device which concerns on this invention. It is a time chart for demonstrating the operation | movement at the time of a power failure same as the above. It is a time chart for demonstrating the operation | movement at the time of a power recovery same as the above. It is a circuit block diagram which shows another form same as the above. It is a perspective view which shows embodiment (emergency lighting fixture) of the lighting fixture which concerns on this invention.

  Hereinafter, embodiments in which the technical idea of the present invention is applied to an emergency lighting device and an emergency lighting device (emergency lamp) will be described in detail with reference to the drawings. However, the lighting device and the lighting fixture to which the technical idea of the present invention can be applied are not limited to the emergency lighting device and the emergency lighting fixture.

(Embodiment 1)
As shown in FIG. 1, the emergency lighting device of the present embodiment includes a light source 1, a storage battery 2, a charging circuit 3, a regular lighting circuit 4, an emergency lighting circuit 5, a switching unit 6, and the like. The light source 1 is formed by connecting a plurality of light emitting diodes (LEDs) in series, and emits light (lights up) with DC power supplied from the normal lighting circuit 4 or the emergency lighting circuit 5. The storage battery 2 is configured by connecting a plurality of battery cells, such as nickel metal hydride batteries and lithium ion batteries, in series. The charging circuit 3 charges the storage battery 2 by converting AC power supplied from an external power source (commercial AC power source 100) into DC power. However, since such a charging circuit 3 is well known in the art, illustration and description of a detailed circuit configuration are omitted.

  The regular lighting circuit 4 is composed of, for example, a step-up chopper circuit or a step-down chopper circuit that converts AC power supplied from the commercial AC power supply 100 into DC power of the rated voltage (= LED forward voltage × number) of the light source 1. Is done. However, since the step-up chopper circuit and the step-down chopper circuit are conventionally known, detailed illustration and description of the circuit configuration are omitted.

  The emergency lighting circuit 5 includes a push-pull inverter circuit 50, a full-wave rectifier 51 including a diode bridge, a smoothing capacitor 52, and the like. The push-pull inverter circuit 50 is a conventionally well-known circuit including a pair of npn transistors Q1 and Q2, a transformer T, resistors R1 and R2, a capacitor C1, an inductor L, and the like.

  The emitters of the transistors Q1 and Q2 are connected to the negative electrode of the storage battery 2, the collector of one transistor Q1 is connected to one end of the winding N1 of the transformer T, and the collector of the other transistor Q2 is connected to one end of the winding N2 of the transformer T It is connected. The windings N1 and N2 of the transformer T are connected in series, and one end of the winding N1 and one end of the winding N2 are connected via a capacitor C1. Furthermore, the connection point between the windings N1 and N2 of the transformer T is connected to the positive electrode of the storage battery 2 via a current limiting inductor L. The bases of the transistors Q1 and Q2 are connected via the winding N3 of the transformer T. The base of one transistor Q1 is connected to the inductor L via the resistor R1, and the base of the other transistor Q2 is connected to the inductor L via the resistor R2. The secondary winding N4 of the transformer T has one end connected to one input end of the full-wave rectifier 51 via the current-limiting capacitor 53 and the other end connected to the other input end of the full-wave rectifier 51. . A smoothing capacitor 52 is connected between the output terminals of the full-wave rectifier 51.

  As will be described later, when the power supply from the storage battery 2 is started, one of the pair of transistors Q1 and Q2 is turned on first. For example, if the transistor Q2 is turned on first, a current flows through the winding N1 of the transformer T, and a voltage is induced in the winding N3. Therefore, the bias voltage applied to the base of the transistor Q2 rises and the transistor Q2 Becomes saturated. The other transistor Q1 remains off because a reverse bias voltage is applied to the base.

  At this time, a resonance voltage is induced in the windings N1 and N2 of the transformer T and the capacitor C1, and the pair of transistors Q1 and Q2 are alternately biased to repeat the on / off operation, thereby continuing the oscillation. Then, the boosted AC voltage is induced in the secondary winding N4 of the transformer T, and the AC voltage is rectified and smoothed by the full-wave rectifier 51 and the smoothing capacitor 52.

  The switching unit 6 includes a pair of electromagnetic relays 60 and 61, a relay driving unit 62, a trigger circuit unit 63, and a voltage detection circuit unit 64. The electromagnetic relays 60 and 61 include common contacts 60C and 61C connected to the light source 1, normally open contacts 60A and 61A connected to the output terminal of the regular lighting circuit 4, and an output terminal (smoothing capacitor) of the emergency lighting circuit 5. And normally closed contacts 60B and 61B connected to both ends), and exciting coils 60L and 61L. One end of the exciting coils 60L and 61L is connected to the positive electrode of the storage battery 2.

  The relay driving unit 62 includes a comparator CP1, a switching element Q3, diodes D1, D2, and the like. The switching element Q3 is composed of an npn-type bipolar transistor, and has an emitter connected to the ground and a collector connected to the cathodes of the two diodes D1 and D2. The anode of one diode D1 is connected to the other end of the exciting coil 60L of the electromagnetic relay 60, and the anode of the other diode D2 is connected to the other end of the exciting coil 61L of the electromagnetic relay 61.

  The trigger circuit 63 includes a comparator CP2, a switching element Q4, diodes D3 and D4, and the like. The switching element Q4 is composed of an npn-type bipolar transistor, and has an emitter connected to the ground and a collector connected to the cathodes of the two diodes D3 and D4. The anode of one diode D3 is connected to the base of the transistor Q1 of the push-pull inverter circuit 50, and the anode of the other diode D4 is connected to the base of the transistor Q2 of the push-pull inverter circuit 50.

  The voltage detection circuit unit 64 detects the power supply voltage of the commercial AC power supply 100, and outputs a voltage higher than the reference voltage Vref if the commercial AC power supply 100 is normally supplied with power. If so, a voltage lower than the reference voltage Vref is output. Comparators CP1 and CP2 compare the output voltage of voltage detection circuit unit 64 with reference voltage Vref, and when the output voltage is higher than reference voltage Vref, the output is set to high level, and when the output voltage is lower than reference voltage Vref The output is set to low level. Note that the relay drive unit 62, the trigger circuit 63, and the voltage detection circuit unit 64 all operate with power supplied from the storage battery 2, and therefore can operate even when the commercial AC power supply 100 is out of power.

  Thus, when power is normally supplied from the commercial AC power supply 100, the switching element Q3 of the relay drive unit 62 is turned on, and excitation current flows through the excitation coils 60L and 61L of the electromagnetic relays 60 and 61. Terminals 60C and 61C are switched and connected to the normally open contacts 60A and 61A. As a result, the light source 1 is connected to the output terminal of the regular lighting circuit 4 via the electromagnetic relays 60 and 61, and the light source 1 is lit with the DC power supplied from the regular lighting circuit 4. At this time, since the trigger circuit 63 has the bases of the transistors Q1 and Q2 grounded, the push-pull inverter circuit 50 does not operate.

  On the other hand, when power supply to the commercial AC power supply 100 is stopped (power failure), the switching element Q3 of the relay drive unit 62 is turned off, and the excitation current does not flow to the excitation coils 60L and 61L of the electromagnetic relays 60 and 61. The terminals 60C and 61C are switched and connected to the normally closed contacts 60B and 61B. Since the trigger circuit 63 does not ground the bases of the transistors Q1 and Q2 to the ground, the push-pull inverter circuit 50 is activated. As a result, the light source 1 is connected to the output terminal of the emergency lighting circuit 5 via the electromagnetic relays 60 and 61, and the light source 1 is lit with the DC power supplied from the emergency lighting circuit 5.

  As described above, in the emergency lighting device of the present embodiment, the emergency lighting circuit 5 is composed of a self-oscillation type switching power supply (push-pull inverter circuit 50), and therefore, an IPD, a control IC, or the like is used. Compared to the case, the light source 1 can be appropriately lit even in a high temperature atmosphere. Note that the relay drive unit 62 and the trigger circuit 63 are mainly composed of discrete elements, so that there is no particular problem even when used in a high temperature atmosphere.

(Embodiment 2)
Embodiment 2 of the lighting device (emergency lighting device) according to the present invention is shown in FIG. In this embodiment, instead of the electromagnetic relays 60 and 61 and the relay driving unit 62, the first diode 65 inserted in the power supply path from the regular lighting circuit 4 to the light source 1 and the emergency lighting circuit 5 to the light source 1 are used. It is characterized in that the second diode 66 inserted in the power supply path is used for the switching unit 6. However, since the configuration other than the switching unit 6 is the same as that of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  Thus, when power is normally supplied from the commercial AC power supply 100, the normal lighting circuit 4 operates and a DC voltage is output. Therefore, the first diode 65 is turned on, and the direct current is supplied from the normal lighting circuit 4 to the light source 1. Power is supplied and the light source 1 is turned on. At this time, since the trigger circuit 63 has the bases of the transistors Q1 and Q2 grounded, the push-pull inverter circuit 50 does not operate and the second diode 66 does not conduct.

  On the other hand, when the commercial AC power supply 100 fails, the regular lighting circuit 4 stops and the first diode 65 does not conduct. Since the trigger circuit 63 does not ground the bases of the transistors Q1 and Q2 to the ground, the push-pull inverter circuit 50 is activated. As a result, the second diode 66 is turned on by the DC voltage output from the emergency lighting circuit 5, and the light source 1 is turned on by the DC power supplied from the emergency lighting circuit 5.

  As described above, the emergency lighting device according to the present embodiment can appropriately turn on the light source 1 even in a high-temperature atmosphere as in the first embodiment. In addition, the use of the two diodes 65 and 66 for the switching unit 6 does not cause a problem such as welding of the contacts, and the size can be reduced.

(Embodiment 3)
Embodiment 3 of the lighting device (emergency lighting device) according to the present invention is shown in FIG. The present embodiment is characterized in that timer circuits 62A and 63A are added to the relay drive unit 62 and the trigger circuit 63, respectively, and other configurations are the same as those in the first embodiment. Therefore, the same code | symbol is attached | subjected to the same component as Embodiment 1, and description is abbreviate | omitted.

  Each of the timer circuits 62A and 63A delays the output change of the comparators CP1 and CP2, and includes, for example, a CR integration circuit.

  Next, the operation of the emergency lighting device of this embodiment will be described with reference to the time charts of FIGS. 4 and 5. 4 and 5, (a) shows the power supply voltage of the commercial AC power supply 100, (b) shows the voltage applied to the light source 1 when the regular lighting circuit 4 is operating, and (c) ) Indicates the voltage applied to the light source 1 when the emergency lighting circuit 5 is operating.

  First, when the commercial AC power supply 100 is normally supplying power, the relay driving unit 62 drives the electromagnetic relays 60 and 61 to connect the normal lighting circuit 4 to the light source 1, so that the normal lighting circuit as shown in FIG. The direct-current power output from 4 is supplied and the light source 1 is turned on. On the other hand, since the trigger circuit 63 prohibits activation of the push-pull inverter circuit 50, the storage battery 2 is charged with the DC output of the charging circuit 3. Then, when the commercial AC power supply 100 fails (see FIG. 4A), the relay driving unit 62 switches the electromagnetic relays 60 and 61 to the emergency lighting circuit 5. Furthermore, since the trigger circuit 63 activates the emergency lighting circuit 5, the light source 1 is lit by the DC power supplied from the emergency lighting circuit 5.

  Here, when a smoothing capacitor is provided at the output stage of the regular lighting circuit 4, even after the commercial lighting power supply 100 stops and the regular lighting circuit 4 stops, the charge until the smoothing capacitor is completely discharged. The voltage is continuously applied to the electromagnetic relays 60 and 61. If the electromagnetic relays 60 and 61 are switched while a voltage is applied, an arc may be generated between the contacts, and the contacts 60A and 61A may be deteriorated. However, in the present embodiment, the timing of switching the electromagnetic relays 60, 61 is delayed by the timer circuit 62A included in the relay driving unit 62, and after the charge of the smoothing capacitor of the regular lighting circuit 4 has been discharged, the electromagnetic relay 60 , 61 can be switched. As a result, the generation of arcs in the electromagnetic relays 60 and 61 can be suppressed (see FIG. 4B). Note that the timer circuit 63A included in the trigger circuit 63 also delays the start timing of the push-pull inverter circuit 50. Therefore, as shown in FIG. 4C, an emergency occurs after a lapse of a predetermined time t1 after the commercial AC power supply 100 has failed. The output voltage of the lighting circuit 5 is applied to the light source 1.

  Next, when the power supply of the commercial AC power supply 100 is resumed (recovered), the pair of electromagnetic relays 60 and 61 are switched and connected to the regular lighting circuit 4 by the relay driving unit 62 as shown in FIG. The output DC power is supplied and the light source 1 is turned on. On the other hand, since the trigger circuit 63 prohibits the operation of the push-pull inverter circuit 50, the direct current output of the charging circuit 3 is not supplied to the emergency lighting circuit 5, and the storage battery 2 is charged.

  Here, even after the commercial AC power supply 100 recovers and the charging circuit 3 starts charging, the voltage continues to be applied to the electromagnetic relays 60 and 61 until the charging charge of the smoothing capacitor 52 is completely discharged. However, as in the case of a power failure, a predetermined delay time t2 from when the commercial AC power supply 100 is restored to when the relay driving unit 62 switches and connects the electromagnetic relays 60 and 61 by the timer circuit 62A of the relay driving unit 62. Occurs. Therefore, since the electromagnetic relays 60 and 61 are switched and connected after the charge of the smoothing capacitor 52 of the emergency lighting circuit 5 has been discharged, the occurrence of arc can be suppressed (FIGS. 5B and 5C). reference).

  Also in the second embodiment, a timer circuit 63A may be provided in the trigger circuit 63 as shown in FIG.

  Here, FIG. 7 shows an embodiment of a lighting fixture (emergency lighting fixture) according to the present invention. This emergency lighting fixture is configured by housing the emergency lighting device of the first or second embodiment described above in the fixture main body 7 directly attached to the wall. The instrument body 7 is formed in a rectangular box shape by a metal material, and the back surface is screwed to the wall. Further, the light source 1 is disposed on the front side of the instrument body 7. A cover 8 that diffuses light emitted from the light source 1 is detachably attached to the front of the instrument body 7. However, the embodiment of the lighting fixture according to the present invention is not limited to the one shown in FIG. 7, and may be a lighting fixture (emergency lighting fixture) embedded in a ceiling, for example.

DESCRIPTION OF SYMBOLS 1 Light source 2 Storage battery 3 Charging circuit 4 Regular lighting circuit 5 Emergency lighting circuit 6 Switching part (switching means)
50 Push-pull inverter circuit (self-oscillation type switching power supply)

Claims (5)

  A light source, a storage battery, a charging circuit for charging the storage battery with power supplied from an external power source, a regular lighting circuit for lighting the light source with power supplied from the external power source, and power discharged from the storage battery. An emergency lighting circuit for turning on the light source, and powering the light source from the regular lighting circuit during power supply to the external power source, and powering the light source from the emergency lighting circuit while power supply to the external power supply is stopped The lighting device is characterized in that the emergency lighting circuit comprises a self-excited oscillation type switching power supply.   The light source is lit by direct current power, and the switching means includes a first diode inserted in a power supply path from the regular lighting circuit to the light source, and a power supply path from the emergency lighting circuit to the light source. The lighting device according to claim 1, further comprising a second diode inserted therein.   3. The switching unit does not supply power to the light source from the emergency lighting circuit while power supply to the regular lighting circuit is continued even when power supply to the external power supply is stopped. Lighting equipment.   4. The switch according to claim 1, wherein the switching means does not supply power to the light source from the service lighting circuit while the power supply of the emergency lighting circuit continues even when power supply of the external power supply is resumed. The lighting device according to any one of the above.   A lighting fixture comprising: the lighting device according to any one of claims 1 to 4; and a fixture body that holds the lighting device and is attached to an attachment surface.

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