JP6323149B2 - Power supply device for lighting with power failure compensation function and lighting device - Google Patents

Description

  The present invention relates to an illumination power supply device with a power failure compensation function and a lighting device with a power failure compensation function using the same.

  Patent Document 1 discloses a normal lighting circuit fed from a commercial power source, a battery, charging means for charging the battery, an emergency lighting circuit for lighting a discharge lamp using the output of the battery, a normal lighting circuit, and an emergency An emergency light lighting device including a relay for switching between a lighting circuit and the lighting circuit is disclosed. When the commercial power supply is normal, the discharge lamp is lit by the regular lighting circuit and the battery is charged by the battery charging means. When the commercial power supply fails, the discharge lamp is lit by the emergency lighting circuit using the battery as a power source.

JP 2003-243192 A

  By the way, in the blackout lamp unit, when the battery is switched on at the time of a power failure, it is necessary to keep the light source on for a time (for example, continuous 20 minutes, 30 minutes, 60 minutes, etc.) determined by the standard. . When an LED is used as the light source, it is possible to design with less power compared to the case where a discharge lamp is used as in the past, but it is expected that the duration of battery lighting will be easily secured. For example, a longer lighting duration may be desired to accommodate a relatively long power outage such as a planned power outage. Here, if the battery capacity of the backup power source included in the blackout lamp unit is increased, a long lighting duration is ensured accordingly. However, an increase in battery capacity is not preferable because it leads to an increase in the size and cost of the backup power source and the blackout lamp unit including the backup power source. Therefore, it is desired that the lighting duration in the lighting of the battery at the time of a power failure is increased without increasing the battery capacity.

  Therefore, the present invention provides a power failure compensation function capable of increasing the lighting duration during a power failure without requiring an increase in the battery capacity of the backup power source in a lighting power source device selectively connected to a commercial power source and a backup power source. It is an object of the present invention to provide a power supply device with illumination. Moreover, this invention makes it a subject to provide the illuminating device with a power failure compensation function using the said power supply device for illumination.

  The lighting power supply device according to the first aspect of the present invention is limited from a full-wave rectifier circuit portion that is selectively connected to a commercial power source and a backup power source and supplied with an input voltage, and an output voltage of the full-wave rectifier circuit portion. A switching power supply circuit unit that supplies the generated current to the light source, an input voltage detection unit that detects a rectified voltage of the input voltage, and the input voltage is a voltage from a commercial power source based on the detected rectified voltage detected by the input voltage detection unit And a control unit that outputs a dimming lighting current to the switching power supply circuit unit when it is determined that the input voltage is not a voltage from a commercial power source.

  The illumination power supply device according to the second aspect of the present invention is limited from a full-wave rectifier circuit portion that is selectively connected to a commercial power source and a backup power source and supplied with an input voltage, and an output voltage of the full-wave rectifier circuit portion. A switching power supply circuit unit that supplies the generated current to the light source, an input voltage detection unit that detects the rectified voltage of the input voltage, and the input voltage is a voltage from the backup power supply based on the detected rectified voltage detected by the input voltage detection unit And a control unit that outputs a dimming lighting current to the switching power supply circuit unit when it is determined that the input voltage is a voltage from the backup power supply.

  According to the illumination power supply device of the first and second aspects, when the control unit determines that the input voltage is not a voltage from the commercial power source based on the detected rectified voltage, or the input voltage is from the backup power source. When it is determined that the voltage is a voltage, the output of the switching power supply circuit unit is switched to a low current for dimming lighting. Therefore, a lighting power supply device with a power failure compensation function that can increase the duration of lighting during a power failure without requiring an increase in the battery capacity of the backup power source is realized. Furthermore, when the same lighting duration time as that of the prior art is required, the battery capacity can be reduced, and the blackout lamp unit can be downsized.

  For example, in the first aspect, the control unit determines that the input voltage is a voltage from a commercial power source when the detected rectified voltage crosses a predetermined threshold at 100 Hz or 120 Hz, and otherwise, the input is input. It is configured to determine that the voltage is not a voltage from a commercial power source. According to this, it is possible to reliably determine whether or not the input voltage is a commercial power supply voltage with a relatively simple configuration.

  Alternatively, in the first aspect, the control unit determines that the input voltage is a voltage from a commercial power source when the detected rectified voltage matches a part of the sine wave, and otherwise the input voltage is It may be configured to determine that the voltage is not from a commercial power source. According to this, even when the output of the backup power supply is not a DC or rectangular wave, but a pseudo sine wave (a synthesized waveform that approximates a sine wave but a waveform that is not a sine wave), the input voltage is not supplied from the commercial power supply. It is possible to determine whether the voltage is a voltage, and the waveform determination accuracy is improved.

  In the second aspect, the control unit is configured to determine that the input voltage is a voltage from the backup power supply when the detected rectified voltage detected by the input voltage detection unit is a DC voltage. The According to this, when the output of the backup power source is a direct current, a sine wave or the like, the waveform discrimination of the detected rectified voltage is realized with a very simple configuration.

  Here, preferably, the light source is an LED, and the switching power supply circuit is formed of a DC / DC converter. Thereby, the light control start at the time of starting what is called dimming lighting is implement | achieved. That is, the desired dimming lighting can be realized immediately after the start-up, instead of the full-light state and then the dimming state at the start-up. Therefore, when the dimming lighting is started by the backup power supply after the LED is extinguished for a moment when the commercial power supply is stopped, the smooth lighting start operation is performed, and the visual discomfort for the user is suppressed.

  The capacitance of the input capacitor connected to the input terminal of the DC / DC converter is preferably 1 μF or less, and the input voltage detection unit is preferably configured to detect the voltage at the output terminal of the full-wave rectification circuit unit. . As a result, an input voltage detector is added to a general DC / DC converter of power factor improvement type, or an input voltage mounted on the general DC / DC converter of power factor improvement type for other purposes. The detection configuration described above is realized by using the detection unit. Therefore, the operation and effect of the present invention can be obtained with few or no additional parts, and an increase in the size and cost of the illumination power supply apparatus can be avoided.

  The illuminating device of this invention is equipped with said power supply device for illumination, and a light source. As a result, an illuminating device with a power failure compensation function that is easy to use and can be continued even for a relatively long power failure is realized. Moreover, since the lighting device of the present invention does not require a change in the configuration of the backup power supply, it can be easily introduced into an existing blackout lamp unit.

It is a block diagram of a power failure lamp unit including a power supply device for illumination with a power failure compensation function and a lighting device according to a first embodiment of the present invention. It is a circuit block diagram which shows an example of the step-up circuit in a backup power supply. It is a circuit block diagram which shows an example of the step-up circuit in a backup power supply. It is a circuit block diagram which shows the power supply device for illumination with a power failure compensation function of 1st Embodiment. It is a figure explaining operation | movement of the power supply device for illumination with a power failure compensation function of 1st Embodiment. It is a figure explaining operation | movement of the power supply device for illumination with a power failure compensation function of 1st Embodiment. It is a circuit block diagram which shows the power supply device for illumination with a power failure compensation function by the 2nd Embodiment of this invention. It is a circuit block diagram which shows the power supply device for illumination with a power failure compensation function by a modification.

First embodiment.
FIG. 1 shows a block diagram of a power failure lamp unit 3 including a lighting device 1 with a power failure compensation function (hereinafter referred to as “lighting device 1”) according to the first embodiment of the present invention. The lighting device 1 and the backup power source 2 constitute the blackout lamp unit 3. The backup power source 2 is supplied with power from the commercial power source AC, and the lighting device 1 is supplied with power from the commercial power source AC during normal use (that is, during a non-power failure, the same applies hereinafter), and is supplied from the backup power source 2 during a power failure. In the present embodiment, an LED lighting device is shown as the lighting device 1.

  Before describing the lighting device 1, first, the configuration and operation of the backup power supply 2 will be described. The backup power source 2 includes a battery 21, a battery charging circuit 22, a charge / discharge switching unit 23, a power switching unit 24, a power failure detection unit 25, a control circuit 26, and a booster circuit 27. The battery 21 is a power storage means, and the charging voltage of the battery 21 is generally about 12 to 20 V at the time of full charge, but can be changed according to the type of the battery to be used, and is not limited to the above voltage. .

  The battery charging circuit 22 is composed of an AC / DC step-down converter, and charges the battery 21 by converting the AC voltage from the commercial power source AC into DC. The input of the battery charging circuit 22 is connected to the commercial power source AC, and the output is connected to the battery 21 via the charge / discharge switching unit 23. The battery charging circuit 22 may be a switching power supply circuit including a full-wave rectification circuit and a flyback converter, or may be a switching power supply circuit including a full-wave rectification circuit, a step-up chopper circuit, and a step-down chopper circuit.

  The charge / discharge switching unit 23, the power supply switching unit 24, the power failure detection unit 25, and the control circuit 26 control the connection relationship between the commercial power source AC, the backup power source 2, and the lighting device 1 according to the presence or absence of a power failure.

  The charge / discharge switching unit 23 includes a pair of switches 231 and 232, the switch 231 is connected to the positive electrode of the battery 21, the switch 232 is connected to the negative electrode of the battery 21, and the connection is switched between the contact A and the contact B, respectively. It is done. When the connection is at the contact A, the battery 21 is connected to the output terminal of the battery charging circuit 22 and disconnected from the booster circuit 27. When the connection is at the contact B, the battery 21 is connected to the input terminal of the booster circuit 27. And disconnected from the battery charging circuit 22.

  The power supply switching unit 24 includes a pair of switches 241 and 242, and is connected to the input end of the lighting device 1 and the connection is switched between the contact A and the contact B. When the connection is at the contact A, the input end of the lighting device 1 is connected to the commercial power supply AC and disconnected from the booster circuit 27. When the connection is at the contact B, the input end of the lighting device 1 is connected to the booster circuit 27. And disconnected from the commercial power supply AC. That is, the lighting device 1 is selectively connected to the commercial power source AC and the backup power source 2.

  The power failure detection unit 25 detects a power failure state in the commercial power source AC. For example, the power failure detection unit 25 may be configured to detect a voltage between input lines and output a drive signal when the voltage is equal to or higher than a predetermined value and to output nothing when the voltage is lower than the predetermined value.

  The control circuit 26 switches all the switch connections of the charge / discharge switching unit 23 and the power supply switching unit 24 to the contact A or the contact B at the same time according to the power failure state detected by the power failure detection unit 25. When a drive signal is input from the power failure detection unit 25 (that is, when there is no power failure), the control circuit 26 connects all the switches 231, 232, 241 and 242 to the contact A. On the other hand, when the drive signal is not input (that is, during a power failure), the control circuit 26 connects all the switches 231, 232, 241, and 242 to the contact B.

  In other words, when the commercial power source AC is not in a power outage (contact A state), the output terminal of the battery charging circuit 22 is connected to the battery 21 and the commercial power source AC is input to the lighting device 1 (LED power source device 10 described later). Connected to the end. In this connected state, the battery 21 and the booster circuit 27, and the booster circuit 27 and the lighting device 1 are cut off. On the other hand, at the time of a power failure of the commercial power supply AC (contact B state), the battery 21 is connected to the input terminal of the lighting device 1 via the booster circuit 27. In this connected state, the output terminal of the battery charging circuit 22 and the battery 21, and the commercial power source AC and the lighting device 1 are cut off.

  In the state of the contact B, the booster circuit 27 boosts the input voltage from the battery 21 and supplies it to the lighting device 1. Note that the booster circuit 27 may be a DC / DC boost converter that outputs a DC voltage, or a DC / AC boost converter that outputs a rectangular wave voltage.

  FIG. 2A shows an example of a circuit configuration when the booster circuit 27 is a DC / DC boost converter. The booster circuit 27 includes a transformer 271, a transistor 272, a diode 273, a capacitor 274, and a driver circuit 275, and constitutes a flyback converter. The high potential side input terminal is connected to the contact B of the switch 231, the low potential side input terminal (reference potential) is connected to the contact B of the switch 232, and the high potential side output terminal is connected to the contact B of the switch 241 (or 242). The low potential side output terminal is connected to the contact B of the switch 242 (or 241). The driver circuit 275 PWM-drives the transistor 272 with a predetermined ON width. Energy is stored in the transformer 271 during the on period of the transistor 272, and the energy is charged to the capacitor 274 via the diode 273 during the off period of the transistor 272. As a result, a DC voltage is output from the booster circuit 27. It is assumed that the driver circuit 275 operates by supplying power from the battery 21. In addition to the flyback converter, for example, a step-up chopper circuit or the like may be employed as the DC / DC converter.

  FIG. 2B illustrates a circuit diagram when the booster circuit 27 is a DC / AC boost converter. The booster circuit 27 includes a full bridge circuit composed of transistors 276 to 279, a driver circuit 280, and a booster transformer 281. The high potential input terminal of the full bridge circuit is connected to the contact B of the switch 231, the low potential input terminal is connected to the contact B of the switch 232, and the AC output terminal of the step-up transformer 281 is the contact B of the switch 241 and the switch 242, respectively. Connected to contact B. The pair of transistors 276 and 279 and the pair of transistors 277 and 278 are alternately turned on / off by the driver circuit 280 to convert the DC voltage of the battery 21 into AC, and the AC voltage is boosted by the step-up transformer 281. As a result, a rectangular wave voltage is output from the booster circuit 27. It is assumed that the driver circuit 280 operates by power supply from the battery 21.

  FIG. 3 shows a circuit diagram of the lighting device 1. With reference to FIG.1 and FIG.3, the illuminating device 1 containing the power supply device 10 for illumination with a power failure compensation function by embodiment of this invention is demonstrated. In the present embodiment, an LED power supply device is employed as the illumination power supply device 10 with a power failure compensation function (hereinafter referred to as “LED power supply device 10”). The lighting device 1 includes an LED power supply device 10 and an LED 15. The LED power supply device 10 includes a full-wave rectification circuit unit 11, a switching power supply circuit unit 12, an input voltage detection unit 13, and a control unit 14. For clarity of illustration, the LED 15 is illustrated as a single LED, but it is assumed that a plurality of LEDs are connected in series or in series as the LED 15.

  The full-wave rectifier circuit unit 11 is composed of a diode bridge and rectifies the input voltage full-wave. Therefore, the full-wave rectification circuit unit 11 outputs a full-wave rectified pulsating voltage of 100 Hz when the input voltage is a commercial power supply voltage of 50 Hz, and 120 Hz when the input voltage is a commercial power supply voltage of 60 Hz. Outputs full-wave rectified pulsating voltage. On the other hand, the full-wave rectifier circuit unit 11 outputs a DC voltage when the input voltage is a DC voltage or a rectangular wave voltage from the backup power supply 2. If necessary, a noise filter, a current fuse, or the like is connected in front of the diode bridge.

  The switching power supply circuit unit 12 is a DC / DC converter, and in this embodiment, a flyback step-down converter is exemplified as the DC / DC converter. The switching power supply circuit unit 12 includes an input capacitor 121, a transformer 122, a switching element 123 such as a MOSFET, a diode 124, and an output capacitor 125. For example, the input capacitor 121 may be a film capacitor having a capacity of 1 μF or less, and the output capacitor 125 may be an electrolytic capacitor having a capacity of 10 μF or more. That is, the switching power supply circuit unit 12 is a power factor improving type converter with a relatively small input capacitor, and the output capacitor 125 is exclusively responsible for the smoothing function of the output current.

  Energy is accumulated by the primary winding of the transformer 122 during the ON period of the switching element 123, and the energy is output from the secondary winding side via the diode 124 during the OFF period of the switching element 123. The output current is determined by the ON duty (ON width) of the switching element 123, and the ON width is determined by the control unit 14. That is, the switching element 123 is PWM-controlled by the control unit 14. Thereby, the limited output current is supplied to the LED 15 from the output voltage of the full-wave rectifier circuit unit 11.

  The input voltage detection unit 13 includes a resistance voltage dividing circuit including resistors 131 and 132. The output voltage of the full-wave rectifier circuit unit 11 is divided by the input voltage detector 13, and the detected rectified voltage (that is, the divided value generated in the resistor 132) is input to the controller 14. Here, between the output terminal of the full-wave rectifier circuit unit 11 and the primary winding side of the transformer 122, only an input capacitor 121 having a relatively small capacitance (for example, 1 μF or less) is substantially disposed as a capacitance component. Not. Therefore, when the input of the full-wave rectifier circuit unit 11 is the commercial power supply AC, the detected rectified voltage has a full-wave rectified pulsating waveform that is substantially similar to the full-wave rectified waveform.

  The control unit 14 includes a waveform determination unit 141, an output switching unit 142, and a driver circuit 145. The waveform determination unit 141 and the output switching unit 142 are configured by, for example, a microcomputer, and are included in, for example, a CPU.

  The waveform discriminating unit 141 discriminates whether or not the input voltage to the full-wave rectifying circuit unit 11 is a voltage from the commercial power source AC or whether or not the input voltage is a voltage from the backup power source 2. As described above, when commercial power is input to the full-wave rectifier circuit unit 11, the detected rectified voltage becomes a full-wave rectified pulsating waveform of 100 Hz or 120 Hz, and the full-wave rectifier circuit unit 11 receives the power from the backup power source 2. When a DC voltage or a rectangular wave voltage is input, the detected rectified voltage has a DC waveform. Therefore, the waveform discriminating unit 141 discriminates the difference between the two waveforms, thereby determining whether or not the input voltage to the full-wave rectifier circuit unit 11 is a commercial power supply voltage, or the input voltage is the output voltage of the backup power supply 2. It can be determined whether or not.

  When determining whether or not the input voltage is a voltage from the commercial power supply AC, for example, the waveform determination unit 141 determines whether or not the input detected rectified voltage crosses a predetermined threshold at a cycle of 100 Hz or 120 Hz. Is determined. The waveform discriminating unit 141 discriminates that the input voltage is a voltage from the commercial power source AC when the detected rectified voltage crosses the predetermined threshold at a cycle of 100 Hz or 120 Hz, and otherwise, the input voltage is the commercial voltage. It is determined that the voltage is not from the power supply AC (that is, the voltage from the backup power supply 2). Note that “crossing the predetermined threshold” means exceeding or falling below the predetermined threshold. According to this determination configuration, it is possible to reliably determine whether or not the input voltage is a commercial power supply voltage with a relatively simple configuration.

  As an alternative example, the waveform determination unit 141 may determine whether or not the detected rectified voltage is a part of a sine wave. In this case, the waveform discriminating unit 141 discriminates whether or not the change pattern of the detected rectified voltage to be sampled matches the sine wave change pattern stored in advance in a memory or the like. When determining that the change pattern of the detected rectified voltage matches the change pattern of the sine wave, the waveform determination unit 141 determines that the input voltage is a voltage from the commercial power source AC, and otherwise, the input voltage is It is determined that the voltage is not from the commercial power supply AC (that is, the voltage from the backup power supply 2). According to this discriminating configuration, even when the output of the backup power supply 2 is not a direct current or a rectangular wave but a pseudo sine wave (a synthesized waveform that approximates a sine wave, but a waveform that is not a sine wave), the input voltage is commercial. It is possible to determine whether the voltage is a power supply voltage, and the waveform determination accuracy is improved.

  Further, when determining whether or not the input voltage is a voltage from the backup power supply 2, the waveform determining unit 141 determines whether or not the input voltage is a DC voltage or a rectangular wave from the booster circuit 27. . Specifically, the waveform determination unit 141 determines whether or not the detected rectified voltage is maintained at a predetermined value or more or a predetermined value (not zero) or less for a predetermined time. The waveform discriminating unit 141 discriminates that the input voltage is the voltage from the backup power source 2 when it is determined that the detected voltage is maintained at or above the predetermined value for a predetermined time, and otherwise It is determined that the input voltage is not the voltage from the backup power source 2 (that is, the voltage from the commercial power source AC). According to this configuration, the waveform discrimination of the detected rectified voltage is realized with a very simple configuration.

  Regardless of which of the above-described waveform discrimination configurations is employed, the waveform discrimination unit 141 determines that the input voltage to the full-wave rectifier circuit unit 11 is not a voltage from the commercial power supply AC, or the input voltage is If it is determined that the voltage is from the backup power supply 2, a dimming command is output to the output switching unit 142.

  The output switching unit 142 outputs a normal normal output signal to the driver circuit 145 when the dimming command is not input, and the dimming output signal for power failure when the dimming command is input. Output to the circuit 145. The dimming output signal may be a signal that decreases the pulse width (on duty) in the PWM control of the switching element 123, for example. The driver circuit 145 PWM-drives the switching element 123 based on the output signal from the output switching unit 142. Thereby, at the time of a power failure, the electric current for dimming is output from the switching power supply circuit part 12 to LED15.

  FIG. 4A shows the operation at the time of power failure of the LED power supply device 10 when the booster circuit 27 of the backup power supply 2 is a DC / DC boost converter (see FIG. 2A). In FIG. 4A, the input voltage Vin to the full-wave rectifier circuit unit 11, the detected rectified voltage Vd detected by the detector 13, and the output current Iout from the switching power supply circuit unit 12 to the LED 15 are shown from the top. The horizontal axis is time. In addition, drawing is a schematic diagram and may not necessarily follow a dimension.

  Until the power failure occurs at time t1, since the input voltage Vin is equal to the voltage (sine wave) of the commercial power supply AC, the detected rectified voltage Vd becomes a full-wave rectified pulsating waveform. Therefore, the control unit 14 determines that the input voltage Vin is a voltage from the commercial power supply AC, and causes the switching power supply circuit unit 12 to output the normal lighting output current Iout = I1.

  When a power failure occurs at time t1, the input voltage Vin and the detected rectified voltage until time t2 when the power failure is detected by the power failure detection unit 25 and the switching operation of the charge / discharge switching unit 23 and the power supply switching unit 24 is performed by the control circuit 26. Vd stops. Between this time t1 and time t2, the output current Iout is also substantially zero.

  When the switching operation to turn on the battery by the charge / discharge switching unit 23 and the power supply switching unit 24 is completed at time t2, the input voltage Vin and the detected rectified voltage Vd become DC voltages. In response to this, the control unit 14 determines that the input voltage Vin is not a voltage from the commercial power supply AC, or determines that the input voltage Vin is a voltage from the backup power supply 2, and dims the switching power supply circuit unit 12. Output current Iout = I2 (I1> I2). Thus, in response to the switching of the input voltage Vin from the commercial power supply voltage to the DC voltage, the switching power supply circuit unit 12 reduces the output current to the LED 15 to I2.

  FIG. 4B shows an operation at the time of power failure of the LED power supply device 10 when the booster circuit 27 of the backup power supply 2 is a DC / AC boost converter (see FIG. 2B). In FIG. 4B, from the upper stage, the input voltage Vin to the full-wave rectifier circuit unit 11, the detected rectified voltage Vd detected by the detector 13, and the output current Iout from the switching power supply circuit unit 12 to the LED 15 are shown. The horizontal axis is time. In addition, drawing is a schematic diagram and may not necessarily follow a dimension.

  Up to time t2, it is the same as the case shown in FIG. 4A. That is, until a power failure occurs at time t1, the input voltage Vin is equal to the voltage (sine wave) of the commercial power supply AC, the detected rectified voltage Vd becomes a full-wave rectified pulsating waveform, and the output current Iout is an output for normal lighting. The current I1 is maintained. From time t1 to time t2, the input voltage Vin and the detected rectified voltage Vd are interrupted, and the output current Iout is substantially zero.

  When the switching operation to battery lighting by the charge / discharge switching unit 23 and the power supply switching unit 24 is completed at time t2, the input voltage Vin becomes a rectangular wave, and the detection voltage Vin obtained by full-wave rectification becomes a DC voltage. That is, the operation of the LED power supply device 10 is the same as when the input voltage Vin is a DC voltage as shown in FIG. 4A. Therefore, as in the case of FIG. 4A, the control unit 14 determines that the input voltage Vin is not the voltage from the commercial power supply AC, or determines that the input voltage Vin is the voltage from the backup power supply 2, and the switching power supply circuit The output current Iout = I2 for dimming is output to the unit 12. Thus, in response to the switching of the input voltage Vin from the commercial power supply voltage to the DC voltage, the switching power supply circuit unit 12 reduces the output current to the LED 15 to I2.

  As described above, in the LED power supply device 10 of the present embodiment, the control unit 14 determines that the input voltage is not the voltage from the commercial power supply AC based on the detected rectified voltage, or the input voltage is from the backup power supply 2. When it is determined that the voltage is equal to, the switching power supply circuit unit 12 is caused to output a dimming lighting current. Thereby, in the LED power supply device 10 used for the blackout lamp unit 3, the lighting continuation time at the time of a power failure can be increased without requiring an increase in the capacity of the battery 21 in the backup power supply 2. And the illuminating device 1 which is easy to use and which can continue a lighting state with respect to a comparatively long power failure is realized. In particular, since the lighting device 1 does not require the backup power source 2 to be changed, it can be easily introduced into the existing blackout light unit 3. Furthermore, if the lighting continuation time at the time of a power failure is the same as before, the capacity of the battery 21 can be reduced and the backup power source 2 and the power light unit 3 can be downsized.

  In the present embodiment, since the light source is the LED 15, unlike the case where the light source is a discharge lamp, so-called dimming start is realized at the start of dimming lighting. That is, the desired dimming lighting can be realized immediately after the start-up, instead of the full-light state and then the dimming state at the start-up. Therefore, even when the LED 15 is turned off for a moment when the commercial power supply is stopped and then the dimming lighting is started by the backup power supply 2, a smooth lighting start operation is performed, and the visual discomfort for the user is suppressed.

  Further, an input voltage detector 13 is added to a general power factor improving type DC / DC converter, or an input voltage mounted on the general power factor improving type DC / D converter for other purposes. The above configuration is realized by using the detection unit 13. Therefore, the effects of the present invention can be obtained with few or no additional parts, and an increase in the size and cost of each device is avoided.

Second embodiment.
In the first embodiment, the input voltage detection unit 13 is connected to the subsequent stage of the full-wave rectification circuit unit 11. However, in the present embodiment, the input voltage detection unit 13 is connected to the front stage of the full-wave rectification circuit unit 11. The connected configuration is shown. FIG. 5 shows a circuit diagram of the LED power supply device 10 according to the present embodiment. The LED power supply device 10 according to the first embodiment shown in FIGS. 1 and 3 is different from the LED power supply device 10 only in the input voltage detection unit 13 and is otherwise substantially the same, and thus detailed description thereof is omitted.

  The voltage detection circuit 13 includes a voltage divider circuit including a full-wave rectifier 133 and resistors 134 and 135. The full-wave rectifier 133 employs a diode bridge having a smaller current capacity than that of the full-wave rectifier circuit unit 11. Here, by appropriately setting the voltage dividing ratio of the resistors 134 and 135, the detected rectified voltage similar to that in the first embodiment is input to the waveform discriminating unit 141. Thereby, an operation similar to that of the configuration of the first embodiment can be obtained. That is, when the control unit 14 determines that the input voltage is not the voltage from the commercial power supply AC based on the detected rectified voltage, or the input voltage is the voltage from the backup power supply 2, The circuit unit 12 is caused to output a dimming current.

  Although the waveform discrimination configuration of the waveform discrimination unit 141 is slightly complicated, a diode is used instead of the full-wave rectifier 133, and the input voltage waveform is discriminated based on the half-wave rectification waveform that is the output of this diode. Is also possible.

  As described above, according to the present embodiment, as in the first embodiment, the LED power supply device 10 used in the power failure light unit 3 continues to be lit during a power failure without requiring an increase in the capacity of the battery 21 in the backup power supply 2. You can increase the time. And since the illuminating device 1 does not require the change of the backup power supply 2, it can be easily introduced into the existing blackout lamp unit 3. Furthermore, if the lighting continuation time at the time of a power failure is the same as before, the capacity of the battery 21 can be reduced and the backup power source 2 and the power light unit 3 can be downsized.

  Further, according to the present embodiment, even when a capacitor having a relatively large capacity is used as the input capacitor of the switching power supply circuit 12, the detection voltage is acquired from the previous stage of the full-wave rectifier circuit unit 11. A full-wave rectified pulsating waveform can be generated. Therefore, the configuration of the present embodiment can also be applied when the switching power supply circuit unit 12 is a so-called capacitor input type circuit that is not a power factor correction type.

Modified example.
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described configuration, and various modifications can be made.

-Modification of light source In each said embodiment, although the light source was LED, the power supply device for illumination was an LED power supply device, and the illuminating device was an LED illuminating device, this invention is illumination of another light source. It is also applicable to the device. The illumination device may be, for example, an illumination device using a discharge lamp such as a fluorescent lamp as a light source, or an illumination device using a semiconductor element such as an organic EL as a light source. In this case, the illumination power supply device 10 with a power failure compensation function (particularly, the switching power supply circuit unit 12) may be configured by an appropriate circuit corresponding to each light source. For example, when the light source is a fluorescent lamp, the switching power supply circuit unit 12 may have a general circuit configuration including, for example, a power factor correction circuit (boost converter) and a half-bridge circuit. However, the fluorescent lamp is dimmed by increasing the driving frequency of the half-bridge circuit. However, when the power is switched (that is, after the light is turned off), it is necessary to turn on the light almost once at the start of battery lighting. Therefore, the transition to the smooth dimming lighting is performed as in the case where the light source is an LED. There is no possibility.

-Modification of switching power supply circuit unit 12 In each of the above embodiments, the switching power supply circuit unit 12 is configured by a flyback converter. However, the switching power supply circuit unit 12 is configured by a step-down converter of another form. For example, a configuration including a power factor correction circuit (a step-up chopper circuit) and a step-down chopper circuit may be employed. FIG. 6 shows a circuit diagram in this case. The switching power supply circuit unit 12 includes a power factor correction circuit 160 and a step-down chopper circuit 170. The power factor correction circuit 160 includes an input capacitor 161, an inductor 162, a switching element 163, a diode 164, and a capacitor 165, and the step-down chopper circuit 170 includes a switching element 171, an inductor 172, a diode 173, and a capacitor 174. The control unit 14 drives the switching elements 163 and 171 in PWM with a predetermined on width. In the power factor correction circuit 160, energy is stored in the inductor 162 while the switching element 163 is on, and the energy is charged to the capacitor 165 via the diode 164 during the off period of the switching element 163. In the step-down chopper circuit 170, during the period in which the switching element 171 is on, an output current flows through the capacitor 165 → the switching element 171, the inductor 172 → the LED 15, and energy is stored in the inductor 172. During a period in which the switching element 171 is off, an output current flows from the inductor 172 to the LED 15 to the diode 173 based on the energy stored in the inductor 172. Capacitor 174 smoothes the output voltage and current.

  When the control unit 14 determines that the input voltage is not the voltage from the commercial power supply AC based on the detected rectified voltage from the input voltage detection unit 13 or when the input voltage is determined to be the voltage from the backup power supply 2 For this, the ON width of the switching element 171 is decreased, and the dimming current is output to the switching power supply circuit unit 12. As described above, the configuration of the present invention can be applied to an illumination power supply device having various types of DC / DC converters.

1 Lighting device with power failure compensation function (lighting device)
10 Power supply for lighting with power failure compensation function (LED power supply)
11 Full-wave rectifier circuit unit 12 Switching power supply circuit unit 13 Input voltage detection unit 14 Control unit 15 LED

Claims (4)

A lighting power supply device selectively connected to a commercial power source and a backup power source,
A full-wave rectifier circuit section to which an input voltage is supplied;
From the output voltage of the full-wave rectifier circuit unit, a switching power supply circuit unit that supplies a limited current to the light source,
An input voltage detector for detecting a rectified voltage of the input voltage;
When determining whether the input voltage is a voltage from the commercial power source based on the detected rectified voltage detected by the input voltage detection unit, and when determining that the input voltage is not a voltage from the commercial power source , e Bei and a control section for outputting the current for dimming to the switching power supply circuit unit, wherein the control unit, the input voltage is the commercial power source when the detected rectified voltage matches a portion of a sine wave determining that a voltage from the input voltage is configured to determine not the voltage from the commercial power source in other cases, irradiation Akirayo power supply. The illumination power supply device with a power failure compensation function according to claim 1 , wherein the light source is an LED, and the switching power supply circuit is a DC / DC converter. 3. The illumination power supply device according to claim 2 , wherein a capacitance of an input capacitor connected to an input end of the DC / DC converter is 1 μF or less, and the input voltage detection unit is an output end of the full-wave rectification circuit unit. A lighting power supply device configured to detect the voltage of the lighting. Lighting device including a lighting power supply device, and said light source according to any one of claims 1 or et 3.

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