JP2009134946A - Led illumination fixture - Google Patents

Led illumination fixture Download PDF

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Publication number
JP2009134946A
JP2009134946A JP2007309226A JP2007309226A JP2009134946A JP 2009134946 A JP2009134946 A JP 2009134946A JP 2007309226 A JP2007309226 A JP 2007309226A JP 2007309226 A JP2007309226 A JP 2007309226A JP 2009134946 A JP2009134946 A JP 2009134946A
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led
light
lighting
unit
current
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JP5285266B2 (en
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Yoshifumi Kuroki
Hiromitsu Mizukawa
宏光 水川
芳文 黒木
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Panasonic Electric Works Co Ltd
パナソニック電工株式会社
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Abstract

Provided is an LED lighting apparatus that can improve the rise of light output at start-up and suppress fluctuations in light output due to ambient temperature.
In an LED lighting device, an LED light-emitting unit 2 including light-emitting diodes 2a to 2d and a lighting circuit unit 4 for supplying a current for lighting the light-emitting diodes 2a to 2d to the LED light-emitting unit 2 are incorporated in the device housing. In addition, a controller for controlling the light output from the lighting fixture to be substantially constant even if the ambient temperature changes is provided in the lighting circuit unit 4. Control is performed so that the current flowing through the LED light emitting unit 2 is minimized when the lighting is stable at a low temperature where the ambient temperature is lower than the normal temperature. In addition, when the input power to the lighting circuit unit 4 at a low temperature when the ambient temperature is lower than the normal temperature is turned on, a larger current is passed through the LED light emitting unit 2 than when it is stable.
[Selection] Figure 1

Description

  The present invention relates to an improvement in temperature characteristics of an LED lighting apparatus that turns on a light emitting diode (hereinafter referred to as “LED”).

  In recent years, the optical performance of LEDs has increased, and lighting fixtures using LEDs are in a state where they can be replaced with conventional light sources because of their long life. If the performance of LEDs further improves in the future, it will be adopted in the field of general-purpose lighting equipment.

  Since the LED has a short light output stabilization time from when it is lit, such as a fluorescent lamp or HID (High Intensity Discharge Lamp), until the light output stabilizes, a scene that requires illuminance and light output immediately after the power is turned on Then, it can be said that LED is suitable. For example, in Patent Document 1 (Japanese Patent Laid-Open No. 8-250067), a main amalgam is provided in a tube in a light bulb type fluorescent lamp, a pair of electrodes are provided at both ends of the tube, and an internal lead wire that supports the electrodes A fluorescent tube provided with an auxiliary amalgam in the vicinity of the electrode, a holder that holds and holds both ends of the fluorescent tube, and a glove that houses the fluorescent tube and constitutes an envelope with the case The light bulb type fluorescent lamp has a configuration in which at least a part of one main surface of the auxiliary amalgam is provided to face the electrode, and the action thereof is at least a part of one main surface of the auxiliary amalgam. Since the electrode faces the electrode, it is easy to receive the radiant heat and convection heat of the electrode, so that mercury is actively released into the discharge space, and the rise of the luminous flux at the beginning of lighting is accelerated.

  On the other hand, the LED has an ambient temperature characteristic of light output, and the light output (for example, light flux and illuminance) is better at a low temperature than at a high temperature. For this reason, lighting fixtures incorporating LED light emitting units including these LEDs generally tend to be used in a state where the light output is reduced during normal use, assuming that the current flowing through the LEDs is constant.

  FIG. 15 shows a circuit diagram of a conventional LED lighting device disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2007-189819). Vs is a commercial AC power supply, DB is a full-wave rectifier, C2 is a capacitor, T1 is a transformer, and includes a primary winding n1 and a secondary winding n2. Q1 is a switching element, D1 is a rectifier diode, 13 is a control circuit for the switching element Q1, 2 is an LED light emitting unit, and 14 is a constant current element.

  Next, the operation of the circuit shown in FIG. 15 will be described. AC voltage of commercial AC power supply Vs is rectified by full-wave rectifier DB, smoothed by capacitor C2, converted to high-frequency rectangular wave AC voltage by switching element Q1 such as transformer T1, MOSFET, and rectified by rectifier diode D1. A series circuit of the constant current element 14 and the LED light emitting unit 2 is connected to the pulse voltage. The switching element Q1 is ON / OFF controlled by the control circuit 13.

  FIG. 16 shows the waveform of the secondary voltage Vn2 of the transformer T1 and the pulse voltage Vp obtained by rectification using the rectifier diode D1. The current flowing through the LED light emitting unit 2 is lit by the constant current Ic defined by the constant current element 14 only when the pulse voltage Vp is present.

  An example of characteristics of the constant current element 14 is shown in FIG. The horizontal axis is the applied voltage, and the vertical axis is the current. When a voltage equal to or higher than the voltage Vc existing in the constant current element 14 is applied, a constant current Ic flows regardless of the applied voltage. The fluctuation of the power supply voltage and the fluctuation of the forward voltage of the LED change so that the voltage applied to the constant current element 14 absorbs the fluctuation of the voltage and the fluctuation of the forward voltage, and the flowing current is kept constant as Ic. Therefore, the power consumption increases or decreases by the fluctuation of the power supply voltage, but the brightness of the LED does not change.

  In the circuit shown in FIG. 15, the LED light emitting unit 2 is turned off when there is no pulse voltage Vp. However, if the pulse voltage Vp is a high frequency of several kHz or more, it cannot be recognized by the human eye that the LED light is off. The light emitting unit 2 seems to be continuously lit.

When the ratio (t / T) of the pulse voltage Vp with respect to one period T of the pulse voltage Vp shown in FIG. And the brightness seems to rise. The ratio (t / T) of the pulse voltage Vp can be adjusted by the control circuit 13.
JP-A-8-250067 JP 2007-189819 A

  Since it is a fluorescent lamp in Patent Document 1, as shown in FIG. 11, it takes time for the light to rise at a low temperature. FIG. 11 shows the measurement by the illuminometer after the power was turned on by the inventors using a light bulb type fluorescent lamp in a low temperature state. Further, as shown in FIG. 12, the light output of the LED tends to decrease as the temperature rises when the output current is constant. FIG. 12 shows a measurement using a spherical light flux meter in which the present inventors used an LED, controlled the output current to be constant with a DC power source, and controlled the case temperature of the LED to be constant with a Peltier element. is there.

  Furthermore, since the illuminance when the conventional lighting circuit unit is used also decreases as the temperature rises as shown in FIG. 14, it is greatly affected by the ambient temperature around the LED lighting fixture, and for example, heat insulation construction is performed. In an embedded LED lighting fixture attached to a simple ceiling, the light output is lower than a predetermined light output.

  For example, Patent Document 2 attempts to stabilize the light output by making the current flowing through the LED constant by a constant current element, but the LED has temperature characteristics, and the ambient temperature rises as shown in FIG. As the light emission efficiency decreases, as shown in FIG. 13, when the luminous flux at normal temperature (25 ° C.) is set to 100%, the illuminance ratio at higher temperatures tends to decrease.

  This invention is made | formed in view of such a point, and makes it a subject to provide the LED lighting fixture which enabled improvement of the rise of the light output at the time of starting, and suppression of the fluctuation | variation of the light output by ambient temperature.

  As shown in FIGS. 1 and 2, the invention of claim 1 includes an LED light emitting unit 2 including light emitting diodes 2a to 2d, and a lighting circuit unit for supplying current to the LED light emitting unit 2 to light the light emitting diodes 2a to 2d. 4 is provided in the lighting circuit unit 4 in the LED lighting device in which the light output from the lighting device is controlled to be substantially constant even if the ambient temperature changes. It is characterized by.

  In the invention of claim 2, as shown in FIGS. 1 and 9, the LED light-emitting unit 2 including the light-emitting diodes 2a to 2d is built in the fixture housing 7, and the light-emitting diodes 2a to 2d are turned on in the LED light-emitting unit 2. In the LED lighting fixture having the lighting circuit portion 4 for supplying the current to be supplied outside the fixture housing, a control portion for controlling the light output from the lighting fixture to be substantially constant even if the ambient temperature changes is provided in the lighting circuit portion 4. It is characterized by being provided in.

  As shown in FIGS. 1 and 2, the invention of claim 3 includes an LED light emitting unit 2 including light emitting diodes 2a to 2d, and a lighting circuit unit for supplying current to the LED light emitting unit 2 to light the light emitting diodes 2a to 2d. In the LED lighting fixture in which the lighting unit 4 is built in the fixture housing 7, as shown in FIG. 7, the current flowing through the LED light emitting unit 2 is minimized when the ambient temperature Ta is stable at low temperatures when the ambient temperature Ta is lower than the normal temperature. A control unit to be controlled is provided in the lighting circuit unit 4.

  As shown in FIGS. 1 and 2, the invention of claim 4 includes an LED light emitting unit 2 including light emitting diodes 2a to 2d, and a lighting circuit unit for supplying current to the LED light emitting unit 2 to light the light emitting diodes 2a to 2d. 4 in the fixture housing 7, as shown in FIGS. 5 and 6, when the input power to the lighting circuit unit 4 is low when the ambient temperature Ta is lower than the normal temperature, the LED light emitting unit The lighting circuit unit 4 is provided with a control unit for controlling the current to flow at a current larger than that at a stable time.

  As shown in FIGS. 1 and 2, the invention of claim 5 includes an LED light emitting unit 2 including light emitting diodes 2a to 2d, and a lighting circuit unit for supplying current to the LED light emitting unit 2 to light the light emitting diodes 2a to 2d. 4 and 4 in the fixture housing 7, as shown in FIGS. 5 and 6, the LED light emitting unit 2 is turned on when the input power to the lighting circuit unit 4 is low when the ambient temperature is lower than the normal temperature. As shown in FIG. 7, a control unit that controls the lighting unit to control the current flowing in the LED light emitting unit 2 to be the smallest when the lighting is stable at a low temperature when the ambient temperature is lower than the normal temperature. It is provided in the part 4.

  According to the first to third aspects of the present invention, when the ambient temperature changes, the current flowing through the LED is increased when the temperature is changed from low to high, and control is performed to increase the light output of the LED lighting apparatus. The light output can be made substantially constant.

  According to the fourth and fifth aspects of the present invention, when the input power to the lighting circuit unit at a low temperature when the ambient temperature is lower than the normal temperature is turned on, the control unit for controlling the LED light emitting unit to flow a larger current than when it is stable is turned on. Since it is provided in the circuit section, it is possible to improve the rise of the light output at the start.

The details of the present invention will be described below with reference to the illustrated embodiments.
(Embodiment 1)
A circuit diagram of Embodiment 1 of the present invention is shown in FIG. The LED light emitting unit 2 includes four LEDs 2a to 2d, and the LED 2a to LED 2d are connected in series from the anode to the cathode. When a positive voltage is applied to the anode side of the LED 2a and a negative voltage is applied to the cathode side of the LED 2d, each of the LEDs 2a to 2d emits light. When a voltage equal to or higher than the total of the forward voltages Vf of the LEDs 2a to 2d is applied, a light beam can be obtained from the LEDs according to the value of the flowing current. Since the forward voltage Vf is usually about 3.5 V, if four are connected in series, they can be lit at a DC voltage of 4 × 3.5 V or more.

  An example of the mounting state of this embodiment is shown in FIG. The LED light emission part 2 and the lighting circuit part 4 are incorporated in the fixture housing 7 of the LED lighting fixture. The instrument housing 7 is made of a metal cylinder that is open at the lower end, and the open end of the lower end is covered with a light diffusion plate 8. The LED light emission part 2 is arrange | positioned so that this light-diffusion plate 8 may be opposed. Reference numeral 21 denotes an LED mounting board on which the LEDs 2a to 2d of the LED light emitting unit 2 are mounted. Reference numeral 41 denotes a power circuit board on which electronic components of the lighting circuit unit 4 are mounted. The LED light emission part 2 is installed so that it may contact the heat sink 71 in the instrument housing | casing 7, and the heat | fever which LED2a-2d generate | occur | produces is released to the instrument housing | casing 7. FIG. Further, the LED light emitting unit 2 and the lighting circuit unit 4 are connected by a lead wire 5 through a hole provided in the heat radiating plate 71. The heat dissipation plate 71 is a metal plate such as an aluminum plate or a copper plate, and has both a heat dissipation effect and a shielding effect. The heat radiating plate 71 is electrically connected to the instrument housing 7 and grounded, but is a non-charging portion that is electrically separated from the plus side and the minus side of the lead wire 5. The appliance housing 7 is embedded in the ceiling 9 and when it is attached to the ceiling where heat insulation is performed, the temperature of the LED light emitting unit 2 and the lighting circuit unit 4 increases as the time after lighting elapses. Will go.

  The output connector CON <b> 2 of the lighting circuit unit 4 and the LED light emitting unit 2 are connected by a pair of lead wires 5. The input connector CON1 of the lighting circuit unit 4 is connected to an AC power supply voltage (for example, AC100V, 50/60 Hz) from the commercial AC power supply Vs.

  The lighting circuit unit 4 includes the switching power supply circuit unit 1 and the filter circuit unit 3. The switching power supply circuit unit 1 is a non-insulated step-down chopper circuit, and is switching-controlled by a control circuit IC3 (for example, MIP552 manufactured by Matsushita Electric Industrial Co., Ltd.) also serving as a power switching element.

  The filter circuit unit 3 of the lighting circuit unit 4 is connected to the commercial AC power source Vs. The filter circuit unit 3 includes a fuse FUSE, a capacitor C3, and a line filter LF. The fuse FUSE is connected in series to one end of the commercial AC power supply Vs, and the capacitor C3, in parallel with the other end of the commercial AC power supply Vs and the output terminal of the fuse FUSE. A line filter LF is connected.

  A full-wave rectifier DB and a capacitor C1 are connected in parallel to the output of the filter circuit unit 3. The LED light-emitting unit 2, the choke L1, the output terminal Q of the control circuit IC3, and the ground are connected to both ends of the capacitor C1. The terminals G are connected in series. The output terminal Q is connected to the drain terminal of the switching MOSFET inside the control circuit IC3. The ground terminal G is connected to the source terminal of the switching MOSFET inside the control circuit IC3.

  A diode D1 is connected in parallel to the series circuit of the LED light emitting unit 2 and the choke L1, and a capacitor C2 is connected in parallel to the LED light emitting unit 2. The cathode side of the diode D1 is connected to the positive side of the capacitor C2, and the anode side is connected to the negative side of the capacitor C2 via the choke L1.

  A temperature sensitive resistor Rt, resistors R2, R3, R8 and capacitors C5 to C7 are connected as control components around the control circuit IC3. The Vdd terminal of the control circuit IC3 is an external reference voltage terminal, and a capacitor C5 is connected to prevent noise at this terminal. The EX terminal of the control circuit IC3 is a terminal that determines the magnitude of the output current to the LED light emitting unit 2, and a resistor R2, a temperature sensitive resistor Rt, and a resistor R3 are connected in series between the Vdd terminal and the circuit ground (ground terminal G). The divided voltage is applied to the EX terminal. The capacitor C6 is a noise prevention capacitor, similar to the capacitor C5 described above.

  The Vin terminal is a terminal for supplying control power to the control circuit IC3 through this terminal from the power line after full wave rectification after the commercial AC power supply Vs is turned on. Capacitor C7 is a capacitor for preventing noise similar to capacitors C5 and C6.

  As a circuit operation, the voltage input from the commercial AC power source Vs is first full-wave rectified by the full-wave rectifier DB via the input connector CON1 through the filter circuit unit 3. The full-wave rectified voltage is applied via a capacitor C1 to a parallel circuit of the LED light emitting unit 2 and the capacitor C2, a choke L1, and a series circuit between the output terminal Q and the ground terminal G of the control circuit IC3.

  Immediately after the commercial AC power supply Vs is turned on, control power is supplied from the Vin terminal of the control circuit IC3 to the control circuit IC3, and oscillation starts when the voltage at the Vdd terminal reaches a predetermined voltage. When the voltage between the output terminal Q and the ground terminal G of the control circuit IC3 is substantially 0, that is, when the internal switching element is in the ON state, the output voltage of the full-wave rectifier DB is transmitted via the control circuit IC3 to the LED light emitting unit 2. Are applied to the parallel circuit of the capacitor C2 and the series circuit of the choke L1, and the LEDs 2a to 2d of the LED light emitting section 2 are lit.

  The time width of the above-mentioned ON state is determined by a threshold voltage set inside the control circuit IC3. When the current flowing between the output terminal Q and the ground terminal G in the control circuit IC3 is converted into a voltage and the voltage reaches the threshold voltage, the output terminal Q and the ground terminal G of the control circuit IC3 are in an open state (that is, The internal switching element is turned off. At this time, a regenerative current flows to the parallel circuit of the capacitor C2 and the LED light emitting unit 2 via the diode D1 due to the back electromotive force generated by the energy stored in the choke L1, and the lighting states of the LEDs 2a to 2d are maintained.

  FIG. 3 shows operation waveforms of the present embodiment, and shows waveforms of a drain-source voltage, a drain-source current, and a current flowing through the diode D1 of a MOSFET which is a switching element inside the control circuit IC3. In the control circuit IC3, the cycle T, which is the sum of the ON interval and the OFF interval in the drawing, that is, the reciprocal switching frequency thereof is fixed to several tens of kHz, and therefore, it is forcibly shifted from the OFF state to the ON state.

  The threshold voltage for setting the time width during which the output terminal Q and the ground terminal G of the control circuit IC3 are in the ON state can be changed by the divided voltage of the EX terminal. By changing the voltage of the EX terminal, the current flowing through the LED of the LED light emitting unit 2 can be set, and a desired light output can be obtained. That is, the current Io flowing to the LEDs 2a to 2d of the LED light emitting unit 2 can be changed by changing the threshold voltage of the control circuit IC3, and this threshold voltage can be changed by changing the voltage applied to the EX terminal of the control circuit IC3. Can be controlled. FIG. 4 shows the relationship between the threshold voltage Vth and the voltage applied to the EX terminal.

  The threshold voltage of the control circuit IC3 (MIP552 manufactured by Matsushita Electric Industrial Co., Ltd.) has an ambient temperature characteristic, and the threshold voltage increases as the temperature of the control circuit IC3 increases. For this reason, since the current Io flowing through the LEDs 2a to 2d becomes small at low temperatures, the rise of light is delayed when the power is turned on at low temperatures. Therefore, by inserting a resistor R2 and a temperature sensitive resistor Rt between the Vdd terminal and the EX terminal of the control circuit IC3, as shown in FIG. 6, when the power is turned on at a low temperature (for example, −10 ° C. to 10 ° C.), the LEDs 2a to The current Io flowing through 2d is increased. The voltage applied to the EX terminal is Vdd × R3 / (R2 + Rt + R3), and the voltage applied to the EX terminal is variably controlled by changing the resistance value of the temperature-sensitive resistor Rt according to the ambient temperature. As a result, as shown in FIG. 5, the rise of the light output when the power is turned on at a low temperature is improved. FIG. 5 shows the relationship between the elapsed time (s) after power-on at low temperatures and the illuminance ratio.

  In this way, by supplying a large current to the LED when the power is turned on at a low temperature, the light output from the LED lighting fixture can be quickly raised with respect to the light rise of the light bulb type fluorescent lamp shown in the conventional example, and the light output immediately Can be stabilized.

  Further, as shown in FIG. 6, the current Io flowing through the LED at a low temperature increases, and as the temperature increases from there, the current Io flowing through the LED gradually decreases. As the temperature further increases, the current Io flowing through the LED becomes smaller. The control is increased.

  As shown in FIG. 2, when the lighting circuit unit 4 is built in the appliance housing 7, the characteristics of the region higher than the room temperature in FIG. 6 are obtained during stable lighting. The flowing current (or the output current of the lighting circuit unit 4) Io is controlled to have a positive characteristic with respect to the ambient temperature Ta. For this reason, the decrease in the light output described in the conventional example (FIG. 14) is suppressed, and the light output becomes substantially constant (FIG. 8) even if the ambient temperature Ta changes.

  FIG. 8 shows the illuminance ratio (at the time of stable lighting) with respect to the ambient temperature of the LED lighting apparatus of the present embodiment. Compared to the conventional example of FIG. I understand.

  As described above, the rise of the light output at low temperature can be improved by the control by the control unit in the lighting circuit unit, and the light output can be made substantially constant even when the light output decreases at the high temperature. I can do it.

  In addition, although four LED light emission parts 2 demonstrated the LED connection in series, you may connect in parallel as long as the direction of an anode and a cathode corresponds irrespective of the number. The same applies to the following embodiments.

(Embodiment 2)
FIG. 9 shows a configuration of a power source-separated LED lighting apparatus using the LED lighting device of the first embodiment. That is, in the first embodiment, the LED light-emitting unit 2 and the lighting circuit unit 4 are built in the fixture housing 7 of the LED lighting apparatus. It is characterized in that the part 4 is incorporated. By doing so, the LED light emitting unit 2 can be made thin, and the separate lighting circuit unit 4 can be installed regardless of the location.

  The instrument housing 7 is made of a metal cylinder that is open at the lower end, and the open end of the lower end is covered with a light diffusion plate 8. The LED light emission part 2 is arrange | positioned so that this light-diffusion plate 8 may be opposed. Reference numeral 21 denotes an LED mounting board on which the LEDs 2a to 2d of the LED light emitting unit 2 are mounted. The appliance housing 7 is embedded in the ceiling 9 and wired from the DC power supply unit 4 arranged on the back of the ceiling via the lead wire 5 and the connector 6.

(Embodiment 3)
FIG. 10 shows a circuit diagram of the third embodiment. In the third embodiment, the switching power supply circuit unit 1 of the lighting circuit unit 4 of the first embodiment is not a step-down chopper circuit but a flyback type DC-DC converter. A description of the same circuit as that of the first embodiment will be omitted.

  A full-wave rectifier DB and a capacitor C1 are connected in parallel to the output of the filter circuit unit 3, and a series circuit of a transformer T1 and a switching element Q1 is connected in parallel with the capacitor C1. A capacitor C4 is connected in parallel to both ends of the switching element Q1. A diode D1 is connected to the high potential side of the secondary winding side of the transformer T1, a capacitor C2 and an output connector CON2 are connected in parallel via the diode D1, and the low potential side of the output connector CON2 and the capacitor C2 A resistor R1 for converting the output current Io into a voltage value is connected between the negative electrodes.

  The first control circuit 11 is provided on the primary side of the transformer T1, and outputs a switching signal of the switching element Q1 according to an input value from the feedback terminal FB. The second control circuit 12 is provided on the secondary side of the transformer T1, and receives a value obtained by converting the output current Io into a voltage by the resistor R1, and generates a feedback signal. The light output element of the photocoupler PC1 is connected to the output of the second control circuit 12, and the feedback input terminal FB of the first control circuit 11 is connected to the light receiving element of the photocoupler PC1.

  The circuit operation will be described below. This DC-DC converter circuit is a so-called flyback type DC power supply, and is a partial resonance type having a capacitor C4 connected in parallel to the switching element Q1. The voltage input from the commercial AC power supply Vs is full-wave rectified by the full-wave rectifier DB through the filter circuit unit 3 via the input connector CON1. The full-wave rectified voltage is applied to a series circuit of the transformer T1 and the switching element Q1 via the capacitor C1. When the switching element Q1 is closed, a current flows through the transformer T1 and is charged as magnetic energy. When the switching element Q1 is opened, the magnetic energy is output to the output side via the secondary winding and the diode D1. To be released.

  The output voltage is smoothed by the capacitor C2 and output through the output connector CON2. The voltage output from the lighting circuit unit 4 is supplied to the LED light emitting unit 2, and the LEDs 2a to 2d are lit when the voltage is equal to or higher than the total of the forward voltages Vf of the LEDs 2a to 2d.

  The current flowing through each of the LEDs 2a to 2d flows to the resistor R1 via the output connector CON2, and the resistor R1 generates a voltage corresponding to the current. This voltage is monitored at the IN terminal of the control integrated circuit IC2 (for example, NJM2146 manufactured by New Japan Radio Co., Ltd.) in the second control circuit 12, and compared with the reference voltage of the reference voltage terminal REF, thereby causing the LEDs 2a to 2d to operate. The output of the OUT terminal of the second control circuit 12 is determined according to the flowing current. This output determines the current flowing through the light emitting element of the photocoupler PC1 connected to the control voltage Vcc. A control voltage is fed back from the light receiving element in the photocoupler PC1 to the feedback terminal FB of the control integrated circuit IC1 of the first control circuit 11 (for example, MR 1722 manufactured by Shindengen Co., Ltd.). At this time, the ON width of the switching element Q1 is determined according to the control voltage input to the feedback terminal FB. By operating in this way, control is performed to keep the current flowing through the LEDs 2a to 2d constant.

  In other respects, the power supply Vcc of the first control circuit 11 is supplied with a voltage regulated by the Zener voltage of the Zener diode ZD1 from the voltage line after full-wave rectification via the resistor R8. Naturally, the voltage does not become lower than the inoperative voltage of the control circuit 11. Further, the ZC terminal of the first control circuit 11 is a zero-cross terminal, which monitors the energy release of the transformer T1 so that the switching element Q1 operates in the discontinuous mode.

  By making the current detection resistor R1 in the control unit a resistance circuit including a temperature sensitive resistor, the current Io flowing through the LEDs 2a to 2d can be reduced at low temperatures, and the current Io flowing through the LEDs 2a to 2d can be increased at high temperatures. For example, a thermistor is used as the temperature sensitive resistance. That is, since the resistance value of the thermistor increases at low temperatures, the reference voltage of the control circuit 12 can be reached with a small current Io flowing through the LEDs 2a to 2d. Similarly, since the resistance value of the thermistor decreases at high temperatures, the current Io flowing through the LEDs 2a to 2d can be increased. By incorporating the lighting circuit unit 4 in the LED lighting fixture, the same characteristics as in FIG. 7 can be obtained.

  Although the flyback type DC power source has been described in this embodiment, the same effect can be obtained with any type of DC power source as long as the same control is performed.

It is a circuit diagram which shows the structure of Embodiment 1 of this invention. It is sectional drawing which shows the mounting state of Embodiment 1 of this invention. It is a wave form diagram for operation | movement description of Embodiment 1 of this invention. It is a characteristic view for operation | movement description of Embodiment 1 of this invention. It is a figure which shows the change of the illumination intensity ratio with time progress at the time of use of Embodiment 1 of this invention. It is a characteristic view which shows the control characteristic of Embodiment 1 of this invention. It is a characteristic view which shows the control characteristic including the instrument of Embodiment 1 of this invention. It is a characteristic view which shows the relationship between the ambient temperature of the LED lighting fixture of Embodiment 1 of this invention, and illumination intensity ratio. It is sectional drawing which shows the mounting state of Embodiment 2 of this invention. It is a circuit diagram which shows the structure of Embodiment 3 of this invention. It is a figure which shows the change of the illuminance ratio with progress of time at the time of use of the conventional bulb-type fluorescent lamp. It is a characteristic view which shows the efficiency fall by the temperature rise of the conventional LED. It is a characteristic view which shows the light beam fall by the temperature rise of the conventional LED lighting fixture. It is a characteristic view which shows the relationship between ambient temperature and the illumination intensity ratio of the conventional LED lighting fixture. It is a circuit diagram of a conventional example. It is an operation | movement waveform diagram of a prior art example. It is a characteristic view of the constant current element used for a prior art example.

Explanation of symbols

2 LED light emitting unit 4 Lighting circuit unit Rt Temperature resistance

Claims (5)

  1. In an LED lighting apparatus that includes an LED light-emitting unit including a light-emitting diode and a lighting circuit unit that supplies a current for lighting the light-emitting diode to the LED light-emitting part, the light from the lighting apparatus is changed even if the ambient temperature changes. An LED lighting apparatus, wherein a control unit for controlling an output to be substantially constant is provided in a lighting circuit unit.
  2. An LED lighting fixture that includes a light emitting diode including a light emitting diode inside the fixture housing and has a lighting circuit portion outside the fixture housing that supplies current to the LED light emitting portion to light the light emitting diode. An LED lighting apparatus characterized in that a controller for controlling the light output from the apparatus to be substantially constant is provided in the lighting circuit section.
  3. LED lighting fixtures that include a light-emitting diode and a lighting circuit portion that supplies a current for turning on the light-emitting diode to the LED light-emitting portion in the fixture housing. An LED lighting apparatus characterized in that a control unit for controlling the current flowing in the LED light emitting unit to be minimized is provided in the lighting circuit unit.
  4. An LED lighting apparatus that includes an LED light-emitting unit including a light-emitting diode and a lighting circuit unit that supplies a current for turning on the light-emitting diode in the LED light-emitting unit, and the lighting circuit at a low temperature when the ambient temperature is lower than the normal temperature An LED lighting apparatus comprising: a control unit that controls the LED light emitting unit to flow a larger current than when it is stable when the input power to the unit is turned on.
  5. An LED lighting apparatus that includes an LED light-emitting unit including a light-emitting diode and a lighting circuit unit that supplies a current for turning on the light-emitting diode in the LED light-emitting unit, and the lighting circuit at a low temperature when the ambient temperature is lower than the normal temperature A control unit that controls the current to flow to the LED light emitting unit at the time of stable lighting at a low temperature when the ambient temperature is lower than normal temperature when the LED light emitting unit is turned on when the input power is turned on. An LED lighting apparatus characterized by being provided in a lighting circuit section.
JP2007309226A 2007-11-29 2007-11-29 LED lighting equipment Active JP5285266B2 (en)

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EP2552180A2 (en) 2011-07-29 2013-01-30 Panasonic Corporation Lighting device and illumination apparatus using same
US8525499B2 (en) 2010-01-26 2013-09-03 Minebea Co., Ltd. Constant current switching power supply
JP2013251130A (en) * 2012-05-31 2013-12-12 Panasonic Corp Led drive device, illuminating device and vehicle illuminating device
JP2013251131A (en) * 2012-05-31 2013-12-12 Panasonic Corp Led drive device, illuminating device and vehicle illuminating device
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JP2014143209A (en) * 2014-03-18 2014-08-07 Panasonic Corp Lighting device, and illuminating fixture and illumination system using the same
JP2017195199A (en) * 2017-07-14 2017-10-26 三菱電機照明株式会社 Power supply device and illumination device

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JP2011030122A (en) * 2009-07-29 2011-02-10 Tamura Seisakusho Co Ltd Led lighting device for visible light communication
WO2011013264A1 (en) * 2009-07-29 2011-02-03 株式会社タムラ製作所 Led illuminating device for visible light communication
JP4746692B2 (en) * 2009-07-29 2011-08-10 株式会社タムラ製作所 LED lighting device for visible light communication
JP2011044316A (en) * 2009-08-20 2011-03-03 Panasonic Electric Works Co Ltd Lighting deice
US8525499B2 (en) 2010-01-26 2013-09-03 Minebea Co., Ltd. Constant current switching power supply
JP2011171230A (en) * 2010-02-22 2011-09-01 Panasonic Electric Works Co Ltd Led lighting circuit
JP2011223800A (en) * 2010-04-13 2011-11-04 Minebea Co Ltd Switching power supply circuit
JP2012050168A (en) * 2010-08-24 2012-03-08 Minebea Co Ltd Switching power supply circuit
US9131564B2 (en) 2011-07-29 2015-09-08 Panasonic Intellectual Property Management Co., Ltd. Lighting device and illumination apparatus using same
EP2552180A2 (en) 2011-07-29 2013-01-30 Panasonic Corporation Lighting device and illumination apparatus using same
EP2552180A3 (en) * 2011-07-29 2013-05-01 Panasonic Corporation Lighting device and illumination apparatus using same
JP2013251131A (en) * 2012-05-31 2013-12-12 Panasonic Corp Led drive device, illuminating device and vehicle illuminating device
JP2013251130A (en) * 2012-05-31 2013-12-12 Panasonic Corp Led drive device, illuminating device and vehicle illuminating device
JP2014135292A (en) * 2014-03-18 2014-07-24 Panasonic Corp Lighting device, and illuminating fixture and illumination system using the same
JP2014143209A (en) * 2014-03-18 2014-08-07 Panasonic Corp Lighting device, and illuminating fixture and illumination system using the same
JP2017195199A (en) * 2017-07-14 2017-10-26 三菱電機照明株式会社 Power supply device and illumination device

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