JP2018198184A - LED lighting device - Google Patents

Abstract

To solve the problem that the number of settable models is limited in an LED lighting device in which resistors of resistance values preset for each kind of lamps are connected in parallel to a series circuit of LED within the lamps, a voltage control part is included for restricting a voltage to be applied to a connection part of a lamp equal to or lower than Vf of all kinds in a state where the lamp is not connected to a power source part, the kind of the lamp is discriminated from the resistance value of the resistor provided in the lamp in a state where the voltage to be applied to the lamp is Vf or less when the lamp is connected, and constant current control is performed in such a manner that a current corresponding to the kind of a connected lamp flows to the LED.SOLUTION: Different kinds lamps in which diodes for detection are connected and are not connected in series to resistors are provided and a VfD of the diode for detection is deviated in a V-I diagram of the resistor, such that the number of settable models can be increased.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an LED lighting device in which a plurality of types of lamps incorporating LEDs are detachably connected to a power supply unit.

  For LED lighting fixtures that detachably connect a plurality of types of lamps to a single power supply unit, the resistance of the resistance value set for each type of lamp with respect to the LEDs for light emission provided in the lamps. Connected in series, at least at the time of first lighting, the resistance value is read in a state where the forward voltage drop (hereinafter simply referred to as Vf) of the LED for light emission is applied to the lamp, that is, the LED does not emit light. There has been proposed one in which the power source side discriminates the type (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2015-133229 (FIG. 4)

  In the device described in Patent Document 1, the resistance value is read in a state where the voltage applied to both ends of the LED for light emission is equal to or lower than Vf of the LED, that is, in a state before the LED starts light emission. . A specific configuration for reading the resistance value is to provide a separate resistor in the power supply unit, and when the lamp is connected, the resistor in the lamp and the resistor in the power supply unit are connected in series, and the partial pressure generated in that state is reduced. A microcomputer in the power supply unit is taken in to determine the model.

  Therefore, when setting a unique resistance value for each lamp model, there is a limit to the number of models that can be set in consideration of errors in the resistance value of the resistance in the lamp, and it is not possible to set more models. There is.

  Then, this invention makes it a subject to provide the LED lighting apparatus which can set more models than the said conventional thing in view of said problem.

  In order to solve the above problems, an LED lighting device according to the present invention includes a detachable lamp in which a plurality of LEDs are connected in series, and supplies power to the lamp when the lamp is detachably connected. An LED lighting device including a power supply unit that emits an LED of a lamp, the lamp having a plurality of types of lamps having different current values to be passed through the LED, and a resistance having a resistance value set in advance for each type Are connected in parallel to the series circuit of the LEDs in each lamp, and the voltage applied to the lamp connection in the state where the lamp is not connected to the power supply section in the order of all kinds of lamps. When a voltage control unit that restricts the voltage to a direction drop voltage (Vf) or less and a lamp are connected, the type of the lamp is determined from the resistance value of the resistor provided in the lamp in a state where the voltage applied to the lamp is Vf or less. Depending on the type of lamp connected In which constant current control is performed so that the current flows through the LED, there are a group in which a detection diode is connected in series to a resistor connected in series to the LED of the lamp and a group in which no diode is connected. The power supply unit discriminates the type of lamp for each of these groups.

  In the state where the detection diode is not connected to the resistor connected in parallel to the LED for illumination, the lamp is connected to the power supply unit, and energization from the power supply unit is started, and at the same time, current starts to flow through the resistor. On the other hand, if a detection diode is connected to the resistor, no current flows through the resistor until a voltage exceeding Vf of the detection diode is applied to the lamp. Then, current starts to flow through the resistor from the time when it exceeds Vf of the detection diode. As a result, on the power supply unit side, the connected lamp can determine whether the group is not connected to the detection diode or the group is not connected. On the appliance side, models can be set for each group, which greatly increases the number of models that can be set compared to the conventional one.

  If there are multiple types of diodes for detection connected in series to the upper resistor, grouping is performed for each number of diodes for detection, and the type of lamp is determined for each group. Furthermore, the number of groups can be increased, and the number of models that can be set as a whole further increases.

  As is apparent from the above description, the present invention can increase the model setting group of lamps depending on the presence or absence of the detection diode and the number of detection diodes, and more models than the conventional one that does not use the detection diode. Number can be set.

The figure which shows the bathroom where the LED lighting fixture by this invention is applied Block diagram showing the overall configuration of the LED lighting fixture Block diagram showing the internal structure of the power supply Diagram showing the configuration of the voltage dividing resistor for model discrimination V-I diagram showing the presence or absence and number of detection diodes

  Referring to FIG. 1, reference numeral 1 denotes a bathroom to which the LED lighting device according to the present invention is applied. This LED illumination device is composed of one power supply unit 2 and a plurality of lamps 31, 32, 33, 34.

  The power supply unit 2 is housed in the upper space of the ceiling 11 of the bathroom 1 and is usually configured not to be exposed in the bathroom 1. The power source 2 is supplied with AC power from an external commercial power source 21, and the lighting of the lamps 31, 32, 33, and 34 is interlocked by a switch 22 provided on the dressing room side adjacent to the bathroom 1. It is configured to be performed all at once.

  Referring to FIG. 2, power supply unit 2 is provided with terminal units 41, 42, 43, 44, and lamps 31, 32, 33, 34 of different models are provided in each terminal unit 41, 42, 43, 44. Is connected. In addition, the lamp connected to each terminal part 41, 42, 43, 44 is not restrict | limited to a specific model, You may connect any lamp to any terminal part.

  Since these lamps 31, 32, 33, and 34 are different from each other, the values of currents flowing through the internal LEDs 310, 320, 330, and 340 are different. Therefore, resistors 311, 321, 331, and 341 for discriminating models are incorporated in the respective lamps 31, 32, 33, and 34 in parallel with the LEDs 310, 320, 330, and 340. A detection diode 322 is connected in series to the resistor 32 to the lamp 32, and a detection diode 332 is connected in series to the resistor 331 of the lamp 33. In addition, two detection diodes 342 and 343 are connected in series to the lamp 34 with respect to the resistor 341. When a lamp of any model is connected to any of the terminal sections, the lamp model is read from the resistance value of the resistor built into the lamp, and constant current control is performed so that the current value corresponds to that model. Is configured to do.

  With reference to FIG. 3, a description will be given below of a lamp 31 in which a detection diode is not incorporated as an example. The power supply unit 2 includes a conversion unit 51 that converts AC power from an external commercial power source into DC power of a predetermined voltage, and a microcomputer unit 5 that controls the power supply unit 2. Further, an illumination control unit 52 is connected to each of the terminal units 41, 42, 43, 44. The illumination control unit 52 adjusts the voltage of the DC power supplied from the conversion unit 51 and controls the current that flows to the lamp connected to each terminal unit. The voltage control and the current control are both performed by a signal from the microcomputer unit 5.

  When the switch 22 is turned on, the microcomputer unit 5 outputs the output voltage of each illumination control unit 52 to the LEDs 310, 320, 330, built in all types of lamps 31, 32, 33, 34 set in advance. The voltage is regulated to a voltage lower than any Vf of 340. In this state, the lamp connected to any of the terminal portions 41, 42, 43, 44 does not emit light, but a current flows through the resistor 311 attached to the lamp 31, for example. Since the resistor 311 is configured to be connected in series to a resistor built in the illumination control unit 52, a partial pressure corresponding to the resistor 311 is generated in the illumination control unit 52. The microcomputer unit 5 reads the partial pressure, and the microcomputer unit 5 determines the model of the lamp 31 connected to the terminal unit 41.

  When the model of the lamp 31 is determined, the illumination control unit 52 performs constant current control so that the current preset for the lamp 31 is obtained. Further, when the lamp 22 is not connected to the terminal portion 42 at the time when the switch 22 is turned on, for example, the illumination control unit 52 connected to the terminal portion 42 is connected to all Vf as described above. Since a low voltage is output, inrush current does not flow to the LED 320 of the lamp 32 even if the lamp 32 is connected to the terminal portion 42 in that state, and the voltage applied when the lamp 32 is connected. Is immediately determined before the voltage Vf of the LED 320 of the lamp 32 is exceeded, and constant current control preset for the lamp 32 is performed.

  By the way, in the state where constant current control is performed, the applied voltage exceeds Vf, so the gain of the signal input to the microcomputer unit 5 is high, but in the state where the model is discriminated, the applied voltage is higher than Vf. Since the voltage is low, the divided voltage is low, and thus the gain of the signal input to the microcomputer unit 5 is low.

  Therefore, as shown in FIG. 4, for example, the lamp 31 will be described. Two resistors 521 and 522 are provided as resistors to which the resistor 311 of the lamp 31 is connected in series. When performing constant current control, the transistor 524 is provided. Although the resistor 521 is short-circuited in the on state, the transistor 524 is turned off to increase the gain of the divided voltage input to the amplifier 523 when performing model discrimination. The output of the amplifier 523 is input to the microcomputer unit 5.

  The above description is about the lamp 31 in which the discrimination diode is not connected in series with the resistor. Thus, in a lamp in which the determination diodes are not connected in series, when the resistance value changes, the slope of the proportional line indicated by A in FIG. 5 changes. As described above, since the slope changes depending on the resistance value, the resistance value can be obtained from the applied voltage and current value, and the model can be specified from the resistance value.

  Next, when the determination diode 322 is connected in series to the resistor 321 as in the lamp 32, for example, current does not flow through the resistor 321 until a voltage higher than VfD of the determination diode 322 is applied to the lamp 32. A current flows through the resistor 321 in a state where the applied voltage exceeds VfD. Therefore, the proportional line relationship indicated by B in FIG. If the resistance value of the resistor 311 of the lamp 31 and the resistance value of the resistor 321 of the lamp 32 are the same, the slope of B and the slope of A will be the same, but if the resistance value of the resistor 321 of the lamp 32 is changed, B The slope of changes.

  Similarly, when two detection diodes 342 and 343 are connected in series to the resistor 341 as in the lamp 34, the lamp 34 has a slope of a straight line starting from a point of 2VfD as shown by the proportional line C in FIG. The resistance value of the resistor 341 can be obtained.

  In this way, the types of lamps can be grouped according to the presence / absence and number of detection diodes, and a plurality of types of lamps can be set for each group, so that many types of lamps are set as a whole. be able to. Although the above embodiment has shown up to two detection diodes, it goes without saying that the number of groups may be increased by providing as many as three or four as necessary.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Bathroom 2 Power supply part 5 Microcomputer part 21 Commercial power supply 22 Switch 31 Lamp 32 Lamp 33 Each lamp 34 Lamp 51 Conversion part 52 Lighting control part 311,321,331,341 Resistance 521,522 Resistance 523 Amplifier 524 Transistor

Claims (2)

  LED illuminating device comprising: a detachable lamp in which a plurality of LEDs are connected in series; and a power supply unit that supplies power to the lamp and emits the LED of the lamp when the lamp is detachably connected. The lamp has a plurality of types of lamps having different current values flowing through the LEDs, and a resistance having a resistance value set in advance for each type is parallel to the series circuit of the LEDs in each lamp. And a voltage control unit that limits the voltage applied to the lamp connection in a state where the lamp is not connected to the power supply unit to be equal to or lower than the forward voltage drop (Vf) of all types of lamps, and When the lamp is connected, the type of the lamp is determined from the resistance value of the resistor provided in the lamp in a state where the voltage applied to the lamp is Vf or less, and a current corresponding to the type of the connected lamp flows to the LED. For constant current control Thus, there are a group in which a diode for detection is connected in series to a resistor connected in series to the LED of the lamp and a group in which no diode is connected, and the power supply unit determines the type of lamp for each group. An LED lighting device characterized by discriminating.   The number of diodes for detection connected in series to the upper resistor is plural, and grouping is performed for each number of diodes for detection, and the type of lamp is determined for each group. The LED lighting device according to 1.

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