JP2016091826A - Light-emitting diode drive device and illumination, and fishing light employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent flickering while using an AC power source.MEANS FOR SOLVING THE PROBLEM: A light-emitting diode (LED) drive device comprises: a full rectification circuit 11 which fully rectifies an AC voltage o a three-phase AC power source; a first LED part 91 which is connected in series with an output side of the full rectification circuit 11; a second LED part 92 which is connected in series with the first LED part 91; first electrification control means which is in parallel with the second LED part 92 and connected in series with the first LED part 91 for controlling the amount of electrification to the first LED part 91; and current limit means 41 which is connected in series with the first LED part 91 and the second LED part 92 for controlling the amounts of electrification to the first LED part 91 and the second LED part 92. A first forward voltage Vf1 for turning on the first LED part 91 is set lower than a second forward voltage Vf2 for turning on the first LED part 91 and the second LED part 92, and the first forward voltage Vf1 for turning on the first LED part 91 is set equal to or lower than a minimum pulsating voltage at which a rectification voltage pulsating a voltage value becomes minimum.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a driving device that drives a light-emitting diode to light, an illumination and a fishing light using the same, and more particularly to a light-emitting diode driving device that is driven using a three-phase AC power source.

  In recent years, light-emitting diodes (hereinafter also referred to as “LEDs”) that can be driven with lower power consumption than incandescent bulbs and fluorescent lamps have attracted attention as light sources for illumination. LEDs are advantageous in that they are small in size and strong in impact resistance, and there is no fear of ball breakage.

  As a power source for such lighting equipment, it is desirable to use an alternating current as a power source. Therefore, a lighting device using a single-phase AC power supply has been proposed (see, for example, Patent Document 1). An example of a circuit diagram of a lighting device using such an AC power supply is shown in FIG. In this lighting device, a single-phase AC voltage of 100 V (see FIG. 19) is full-wave rectified (see FIG. 20), and the full-wave rectified current is connected in series to the LED 122 and the transistor 123 as a driving element. To light up.

JP 2006-147933 A

  However, in this configuration, there is a section where the voltage waveform obtained by full-wave rectification of the single-phase alternating current is 0 V, and thus there is a problem that flickering occurs as a result of a non-lighting section where the LED does not light. In order to eliminate such a non-lighting period, it is conceivable to add a smoothing capacitor or the like. However, an electrolytic capacitor is used for a large-capacity smoothing capacitor, and the electrolytic capacitor has a longer life than other capacitors. Due to the short length, the life of the device is shortened due to the life of the smoothing capacitor.

  The present invention has been made in view of such conventional problems. An object of the present invention is to provide a light-emitting diode driving device that uses an AC power source and prevents flickering, and an illumination and fishing light using the same.

  In order to achieve the above object, according to a light-emitting diode driving device according to one aspect of the present invention, a rectified voltage is obtained by full-wave rectifying an AC voltage of a three-phase AC power source connected to a three-phase AC power source. A full-wave rectifier circuit for obtaining, a first LED part including at least one LED element connected in series with an output side of the full-wave rectifier circuit, and connected in series with the first LED part, at least A second LED unit including one LED element; and a first LED for controlling the amount of current supplied to the first LED unit connected in parallel with the second LED unit and in series with the first LED unit. An energization control unit; and a current limiting unit that is connected in series with the first LED unit and the second LED unit and controls the energization amount to the first LED unit and the second LED unit, The first forward voltage for lighting one LED unit is The first forward voltage, which is lower than the second forward voltage Vf2 for lighting the first LED part and the second LED part, and the first forward voltage for lighting the first LED part is the smallest rectified voltage whose voltage value pulsates It is set to be the same as or lower than the minimum pulsating voltage.

  According to the above configuration, since the first LED unit is always lit regardless of fluctuations in the rectified voltage, the non-lighting period during which the first LED unit is not lit is eliminated, and driving of the light emitting diode with less flickering is realized.

It is a circuit diagram which shows the light emitting diode drive device which concerns on Embodiment 1 of this invention. It is a graph which shows the voltage waveform of a three-phase alternating current. It is a graph which shows the voltage waveform which rectified the three-phase alternating current. 2 is a graph showing a pulsating voltage waveform rectified by the light emitting diode driving device of FIG. 1 and a voltage waveform applied to an LED unit. It is a circuit diagram which shows the light emitting diode drive device which concerns on Embodiment 2 of this invention. 6 is a graph showing a normal pulsating voltage waveform rectified by the light emitting diode driving device of FIG. 5 and a voltage waveform applied to an LED unit. 6 is a graph showing a pulsating voltage waveform at the time of voltage drop rectified by the light emitting diode driving device of FIG. 5 and a voltage waveform applied to an LED unit. 1 is a circuit diagram of a light-emitting diode driving apparatus according to Embodiment 1 of the present invention. It is the schematic of the state which mounted the 1st LED drive part and the 2nd LED drive part on the board | substrate. It is a graph which shows the voltage waveform which applied the full-wave rectification of AC220V three-phase alternating current, and the voltage waveform applied to the LED part which concerns on Example 1. FIG. It is a graph which shows the light beam obtained with the light emitting diode drive device based on Example 1 in the case of AC220V three-phase alternating current. 5 is a graph showing a voltage waveform obtained by full-wave rectification of a three-phase AC of 200 V AC and a voltage waveform applied to the LED unit according to Example 1. It is a graph which shows the light beam obtained with the light emitting diode drive device which concerns on Example 1 in the case of AC200V three-phase alternating current. FIG. 14A is a graph showing the pulsating voltage and LED voltage when the LED driving device of FIG. 18 is driven at AC 200V, and FIG. 14B is a graph showing the pulsating voltage and LED voltage when driven at AC 220V. FIG. 14C is a graph showing the pulsating voltage and the LED voltage when driven at 240 V AC. 6 is a circuit diagram of a three-stage light emitting diode driving device using a single-phase AC power source according to Comparative Example 2. FIG. FIG. 16A is a graph showing the pulsating voltage and LED voltage when the LED driving device of FIG. 15 is driven by AC 200 V, and FIG. 16B is a graph showing the pulsating voltage and LED voltage when driven by AC 220 V; FIG. 16C is a graph showing the pulsating voltage and LED voltage when driven at 240 V AC, FIG. 16D is a graph showing the luminous flux in FIG. 16A, FIG. 16E is a graph showing the luminous flux in FIG. 16B, and FIG. It is a graph which shows. FIG. 17A is a graph showing the time change of the voltage and the luminous flux in Comparative Example 2, and FIG. 17B is a graph showing the voltage and the temporal change of the luminous flux in Example 1. It is a circuit diagram of the light emitting diode drive device of one step. It is a graph which shows the voltage waveform of a single phase alternating current. It is a graph which shows the voltage waveform which rectified the single phase alternating current.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below is for embodying the technical idea of the present invention, and the present invention is not limited to the following. Further, the present specification by no means specifies the members shown in the claims to the members of the embodiments. In particular, unless otherwise specified, the configuration, dimensions, materials, shapes, and relative arrangements of the components described in the embodiments are not intended to limit the scope of the present invention. It is just an illustrative example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In the present specification, “connected in series” may include a mode in which other members are interposed therebetween.
(Embodiment 1)

FIG. 1 shows a circuit diagram of a light-emitting diode driving apparatus 100 according to Embodiment 1 of the present invention. The LED driving device 100 shown in this figure includes a full-wave rectifier circuit 111 connected to a three-phase AC power source, a first LED unit 191, a second LED unit 192, a first energization control unit 151, a current limiter. Means 141 and current detection means 104. The light emitting diode driving apparatus 100 is connected to a three-phase AC power supply AP, and obtains a rectified voltage (pulsating voltage) obtained by rectifying the three-phase AC voltage by the full-wave rectifier circuit 111. Further, on the output side of the full-wave rectifier circuit 111, the first LED aggregate 190 constituted by the first LED part 191 and the second LED part 192 is connected in series on the output line OL. Here, two LED parts are used, and the first LED part 191 and the second LED part 192 are connected in series to constitute the LED assembly 10, but the number of LED parts may be three or more. . Furthermore, the LED assembly 10, the current limiting means 141, and the current detection means 104 are connected in series to the output line OL.
(First energization control means 151)

  A first energization control unit 151 for controlling the energization amount to the first LED unit 191 is connected in parallel with the second LED unit 192. The first energization control unit 151 has one end connected in series with the downstream side of the first LED unit 191 and the other end connected to the upstream side of the current limiting unit 141, and the amount of energization to the first LED unit 191 is controlled. Configure the bypass path to be adjusted. That is, since the amount of current bypassed by the first energization control unit 151 can be adjusted, the energization amount of the first LED unit 191 can be controlled as a result. In the example of FIG. 1, the first energization control unit 151 is connected in parallel with the second LED unit 192 to form the first bypass path BP1. The parallel connection here does not require that both ends of each LED unit and each energization control means are connected, and one end of each energization control unit is connected to one end of each LED unit, It is sufficient if it is configured to be branched. For example, in the example of FIG. 1, the first energization control unit 151 has one end connected to the upstream side of the second LED unit 192 and the other end connected to the upstream side of the current limiting unit 141 on the output line OL. . As described above, the parallel connection of the energization control means is used to indicate a connection form in which the current of each LED unit connected on the output line OL is branched.

The first energization control unit 151 can be configured by, for example, a bypass unit that bypasses the current flowing through the first LED unit 191 and a current control unit that controls the operation of the bypass unit. The energization control means is a member for controlling a current circuit that performs current driving of the LED unit. For example, the first energization control unit 151 and the current limiting unit 141 that controls the operation of the first energization control unit 151, that is, the operation such as ON / OFF and continuously variable current amount, constitute a kind of constant current circuit. . The constant current circuit is controlled by, for example, monitoring the current amount of the first LED aggregate 190 using the current detection means 104 connected to the output line, and the current control means determines the control amount of the bypass means based on this value. Switch. In addition, the first energization control unit may be configured as the first energization control unit in addition to the bypass unit and the current control unit. Such first energization control means 151 can be composed of a semiconductor drive element such as a transistor.
(First LED unit 191 and second LED unit 192)

  On the other hand, each LED unit is a block in which one or a plurality of LED elements are connected in series and / or in parallel. As the LED element, a surface mount type (SMD) or a bullet type LED can be used as appropriate. Moreover, the package of the SMD type LED element can select the outer shape according to the application, and a rectangular type in a plan view can be used. Furthermore, it goes without saying that an LED in which a plurality of LED elements are connected in series and / or in parallel in a common package can be used as the LED unit.

  Moreover, the 1st LED part 191 can also be divided | segmented into a some 1st LED division part. For example, the first LED unit 191 is divided into a first LED dividing unit 91A and a second LED dividing unit 91B. The first LED division unit 91A and the second LED division unit 91B are connected in series with each other. However, the second LED unit 192 is connected between the first LED dividing unit 91A and the second LED dividing unit 91B. By doing in this way, the 1st LED part 191 always lighted can be dispersively arrange | positioned, and the light distribution of the 1st LED aggregate 190 can be closely approached. In particular, the first LED division portion 91A and the second LED division portion 91B that are always lit on both sides of the second LED portion 192 that repeats the blinking operation are arranged to make the blinking of the second LED portion 192 inconspicuous and reduce flicker. An effect can be obtained. Further, the first LED unit 191 that is constantly lit increases the amount of heat generated because the drive time is longer than that of the second LED unit 192 that blinks. For this reason, it becomes advantageous also in terms of heat dissipation by dividing and arranging the first LED portion 191 having a large calorific value.

The first forward voltage Vf1, which is an added value of the forward voltages of the LED elements included in the first LED unit 191, is determined by the number of LED elements connected in series. The second forward voltage Vf2 for lighting both the first LED part 191 and the second LED part 192 is an LED element connected in series included in the second LED part 192 in addition to the first forward voltage Vf1. The value obtained by adding the forward voltage of.
(Current detection means 104)

The light emitting diode driving device 100 controls the energization amount for each LED unit based on the current value detected by the current detecting means 104. In other words, current control is based on the amount of current that is actually energized rather than the voltage value of the rectified voltage, so it is not affected by variations in the forward voltage of the LED element, and the LED unit can be accurately switched at an appropriate timing. Is realized and stable operation with high reliability is expected. Current detection means 104 can be used to detect this current value. A resistor or the like can be suitably used for the current detection means 104. In the example of FIG. 1, the current detection unit 104 is connected to the downstream side of the current limiting unit 141. However, the current detection unit 104 is not limited to this position, and may be provided at any position on the output line. Furthermore, the current detection means is not limited to one, and a plurality of current detection means may be provided. For example, as will be described later, when a plurality of energization control means are provided, a current detection means can be provided for each energization control means.
(Full-wave rectifier circuit 111)

The full-wave rectifier circuit 111 is a member for obtaining a rectified voltage by full-wave rectifying a three-phase AC voltage supplied from a three-phase AC power supply. As shown in the graph of FIG. 2, the three-phase alternating current is ideally supplied with alternating-current power that changes in time according to a sine curve in a three-phase state with a phase shifted every 120 °. The full-wave rectifier circuit 111 is preferably a diode bridge. By performing full-wave rectification by passing through a full-wave rectifier circuit 111 constituted by a diode bridge, a three-phase AC voltage is obtained as a rectified pulsating voltage without a 0 V section as shown in the graph of FIG. . By using the pulsating flow waveform of the rectified voltage, a special member for smoothing becomes unnecessary. In particular, since it is not necessary to use a conventional smoothing capacitor, a general electrolytic capacitor as a smoothing capacitor can be excluded from the light emitting diode driving device. While electrolytic capacitors have a large capacity, deterioration over time due to electrolyte leakage occurs and there is a lifetime, so it is possible to avoid a situation where the lifetime of the LED driving device is determined by the lifetime of the electrolytic capacitor, A highly reliable LED driving device that can be used stably over a long period of time is realized.
(Operation example of Embodiment 1)

  Next, based on FIG. 4, operation | movement of a light-emitting-diode drive device provided with the 1st LED part 191 and the 2nd LED part 192 is demonstrated. Here, the first forward voltage Vf1 obtained by adding the forward voltages of the LED elements constituting the first LED unit 191 to turn on the first LED unit 191 is substantially the same as the minimum pulsating voltage of the pulsating rectified voltage. It is set to be. Actually, the first forward voltage Vf1 is set slightly lower than the minimum pulsating voltage in consideration of variations in the voltage of the three-phase AC power supply, thereby avoiding the situation where the first LED unit 191 does not light up. it can. The second forward voltage Vf2 for lighting the first LED unit 191 and the second LED unit 192 is set between the minimum pulsating voltage and the maximum pulsating voltage of the pulsating rectified voltage.

  In a section where the pulsating voltage is lower than the second forward voltage Vf2 (section a in FIG. 4), the first LED unit 191 is energized by the first energization control means 151. At this time, the second LED unit 192 is turned off.

  When the pulsating voltage rises and reaches the second forward voltage Vf2, the energization of the second LED unit 192 is started, and a section where the pulsating voltage is equal to or higher than the second forward voltage Vf2 (in FIG. In the section b), the first LED unit 191 and the second LED unit 192 are turned on, and the current limiting unit 141 controls the energization of the second LED unit 192.

  On the other hand, when the pulsating voltage decreases and reaches the second forward voltage Vf2, the energization to the second LED unit 192 is stopped, and the section where the pulsating voltage is equal to or lower than the second forward voltage Vf2 (FIG. 4). In section c), the second LED portion 192 is turned off, and only the first LED portion 191 is turned on by the first energization control means 151.

  When the pulsating voltage rises again, the section a is shifted to the section b, and the lighting of the second LED unit 192 described above is resumed. Thus, the 1st LED part 191 is always lighting regardless of the time change of a pulsating voltage. On the other hand, the second LED unit 192 is turned on in a section having a voltage value higher than the second forward voltage Vf2 and turned off in a section lower than the second forward voltage Vf2 in accordance with a change in the pulsating voltage. The operation will be repeated.

According to this light emitting diode driving device, since there is no section in which the voltage waveform obtained by full-wave rectification of the three-phase alternating current is 0 V, it is possible to eliminate a period during which the light does not light, and to provide a high quality light emitting diode driving device that prevents flickering. Can be realized. In addition, the drive loss can be reduced by always lighting the first LED unit 191 regardless of the voltage waveform of the full-wave rectified pulsating voltage and lighting the second LED unit 192 at a portion where the voltage waveform voltage is high. And the luminous flux can be improved.
(Embodiment 2)

  The operation of the light emitting diode driving device including the first LED unit and the second LED unit has been described above. In this LED driving device, when the effective voltage of the three-phase AC power supply is stable, the first LED portion is always lit as described above. It can be suitably used.

  On the other hand, when the effective voltage of the three-phase AC power supply decreases due to the fluctuation of the power supply voltage and the minimum pulsating voltage becomes equal to or lower than the first forward voltage Vf1, the first LED unit does not light up, and the non-lighting period Will occur. In particular, in an environment where the power supply voltage is not stable and the power supply voltage fluctuates, there is a concern about a problem due to the occurrence of a period during which the power is not turned on. Therefore, by setting any one of the LED driving devices in which the LED unit and the energization control means are connected in multiple stages to operate only when the power supply voltage fluctuates, it is possible to cope with such power supply voltage fluctuations. It can be configured to be compatible. For example, multiple stages of LED units that are always lit when operating at the rated voltage are prepared so that the power voltage is always lit even when the power voltage drops. The LED part is configured to remain partially. As an example, the LED drive device is provided with three stages in which the operating voltage is higher, middle, and lower in the LED unit and energization control means, and when operating at the rated voltage, By always lighting the lower stage and blinking the upper stage, while realizing a light-emitting diode driving device with less loss, when the power supply voltage drops below the rated voltage, the upper stage is turned off. However, the lower stage is always lit, and the middle stage is blinked to prevent the occurrence of a section in which all the LED parts are turned off even when the effective value of the power supply voltage is reduced. It is possible to realize a highly reliable lamp such as a fishing light or lighting.

As such an example, a light-emitting diode driving apparatus 200 according to Embodiment 2 is shown in FIG. The light emitting diode driving device 200 shown in this figure includes a third LED portion 193 ′ in addition to the first LED portion 191 ′ and the second LED portion 192 ′. Moreover, in addition to 1st electricity supply control means 151 ', 2nd electricity supply control means 152' is provided. Further, the light emitting diode driving apparatus 200 includes a full-wave rectifier circuit 111 ′, a current limiting unit 141 ′, and a current detecting unit 104 ′ as in FIG. In this example, the second forward voltage Vf2 ′ for lighting the first LED unit 191 ′ and the second LED unit 192 ′ is set to be substantially the same as or slightly lower than the minimum pulsating voltage. . In other words, the combination of the first LED portion 191 ′ and the second LED portion 192 ′ in FIG. 5 corresponds to the first LED portion 191 in FIG. 1, and the third LED portion 193 ′ in FIG. This corresponds to the second LED unit 192 in FIG. Then, the third forward voltage Vf3 ′ for lighting the first LED unit 191 ′, the second LED unit 192 ′, and the third LED unit 193 ′ is set between the minimum pulsating voltage and the maximum pulsating voltage. . As a result, the first LED unit 191 ′ and the second LED unit 192 ′ are always lit regardless of the time change of the pulsating voltage, and the third LED unit 193 ′ is activated according to the change of the pulsating voltage. The flashing operation of turning on the light in the section having a voltage value higher than the forward voltage Vf3 ′ while turning off the light in the section having the voltage value lower than the third forward voltage Vf3 ′ is repeated.
(Operation example of Embodiment 2)

  A specific operation will be described based on the graph of FIG. 6. In a section where the pulsating voltage is lower than the third forward voltage Vf3 ′ (section a ′ in FIG. 6), the second energization control means 152 ′. Energization of the first LED unit 191 ′ and the second LED unit 192 ′ is controlled. At this time, the third LED portion 193 'is turned off.

  When the pulsating voltage rises and reaches the third forward voltage Vf3 ′, energization to the third LED portion 193 ′ is started, and a section where the pulsating voltage is greater than or equal to the third forward voltage Vf3 ′ (FIG. 6, in the section b ′), the first LED portion 191 ′, the second LED portion 192 ′, and the third LED portion 193 ′ are turned on, and the current limiting means 141 ′ controls the energization of the third LED portion 193 ′. Is done.

  On the other hand, when the pulsating voltage decreases and reaches the third forward voltage Vf3 ′, the power supply to the third LED portion 193 ′ is stopped, and the section where the pulsating voltage is equal to or lower than the third forward voltage Vf3 ′. In FIG. 6, in the section c ′, the third LED portion 193 ′ is turned off, and the first LED portion 191 ′ and the second LED portion 192 ′ are turned on by the second energization control means 152 ′.

Then, when the pulsating voltage rises again, the section a is shifted to the section b, and the lighting of the third LED portion 193 ′ described above is resumed. Thus, 1st LED part 191 'and 2nd LED part 192' are always lighting regardless of the time change of a pulsating voltage. On the other hand, the third LED unit 193 ′ is turned on in a section having a voltage value higher than the third forward voltage Vf3 ′ and turned off in a section lower than the third forward voltage Vf3 ′ in accordance with a change in the pulsating voltage. The flashing operation will be repeated.
(Operation when effective voltage drops)

  On the other hand, the operation in the case where the effective voltage of the three-phase AC power supply is reduced due to the fluctuation of the power supply voltage will be described with reference to FIG. Here, as an example, a three-phase AC power supply with a rated voltage of 220V is used, and the LED drive that is set to light the first LED portion 191 ′ even when the effective voltage drops to 200V when the power supply voltage decreases is driven. The apparatus will be described. A first forward voltage Vf1 for turning on the first LED unit 191 ′ so that the first LED unit 191 ′ is turned on in advance at the minimum pulsating voltage (decreased minimum pulsating voltage) of the lowered power supply voltage. 'Is set to be almost the same as the reduced minimum pulsating voltage or slightly lower than this considering the margin. Thereby, since the pulsating rectified voltage always exceeds the first forward voltage Vf1 ', the lighting of the first LED portion 191' is always maintained. On the other hand, the second forward voltage Vf2 'for turning on the first LED portion 191' and the second LED portion 192 'is set between the reduced minimum pulsating voltage and the reduced maximum pulsating voltage. When the third forward voltage Vf3 'for turning on the third LED unit 193' is higher than the reduced maximum pulsating voltage, the third LED unit 193 'is not always turned on. Accordingly, in this example, the first LED portion 191 'is always lit regardless of the pulsating voltage, the second LED portion 192' is blinking in accordance with the pulsating voltage, and the third LED portion 193 'is always in the off state.

  Specifically, in a section where the pulsating voltage is lower than the second forward voltage Vf2 ′ (section a ″ in FIG. 7), the first LED unit 191 ′ of FIG. At this time, the second LED unit 192 ′ (and the third LED unit 193 ′) is turned off.

  Then, when the pulsating voltage rises and reaches the second forward voltage Vf2 ′, energization to the second LED unit 192 ′ is started, and a section in which the pulsating voltage is equal to or higher than the second forward voltage Vf2 ′ ( In FIG. 7, in the section b ″), the first LED unit 191 ′ and the second LED unit 192 ′ are turned on, and the second LED unit 192 ′ is controlled to be energized by the second energization control unit 152 ′. In addition, 3rd LED part 193 'maintains a light extinction state.

  On the other hand, when the pulsating voltage decreases and reaches the second forward voltage Vf2 ′, the energization to the second LED unit 192 ′ is stopped and the pulsating voltage is equal to or lower than the second forward voltage Vf2 ′. In FIG. 7, the second LED unit 192 ′ is turned off, and the first LED unit 191 ′ is turned on by the first energization control unit 151 ′. The third LED unit 193 ′ is turned off. The state is maintained.

  When the pulsating voltage rises again, the section a ″ shifts to the section b ″, and the lighting of the second LED unit 192 ′ described above is resumed. Thus, the first LED portion 191 ′ is always lit regardless of the time change of the pulsating voltage. On the other hand, the second LED unit 192 ′ is turned on in a section having a voltage value higher than the second forward voltage Vf2 ′ and turned off in a section lower than the second forward voltage Vf2 ′ in accordance with a change in the pulsating voltage. The flashing operation will be repeated. The third LED portion 193 'is always kept off.

  In this way, even when the effective voltage of the three-phase AC power supply drops below the rated value, the first LED unit 191 ′ can always be lit, and the high quality that suppresses flickering by eliminating the period of non-lighting. Thus, driving of a light-emitting diode with high reliability is realized.

  In the above example, the circuit example in which the lighting of the LED unit is ensured even when the effective value of the power supply voltage is reduced by about 10% has been described. However, the reduction of the effective value of the power supply voltage is not limited to this example, and is designed as appropriate according to the required specifications, applications, etc., for example, a circuit design that operates even when the reduction is 20%. Preferably, even when the effective value of the power supply voltage falls within a range of 5% to 25%, more preferably 8% to 20% of the rated voltage, any one of the LED units is maintained in a constantly lit state. design.

In the above example, the operation guarantee when the effective value of the power supply voltage is reduced has been described. However, it is also possible to configure a light-emitting diode driving device corresponding to the case where the effective value of the power supply voltage is increased. When the effective value of the power supply voltage becomes high, the LED unit is not turned off, but the components that are not used for the supplied power increase, and the efficiency decreases. Therefore, by adding an upper stage and adding an LED unit that is turned on when a voltage higher than the rated voltage is input, such a decrease in efficiency can be suppressed. However, when driving at the rated voltage, the upper LED section is not lit, so adding an LED section that is not lit at normal times causes hardware redundancy, and there is an energization control means that always operates at the rated time. It is possible that the loss during rated operation will increase slightly due to the addition, so the adoption is determined according to the required specifications.
Example 1

The light emitting diode driving device described above can be used for various devices using LEDs, such as lighting devices and fishing lights. Next, as a specific circuit example for realizing the above light emitting diode driving device, a circuit diagram of the light emitting diode driving device 1 according to Embodiment 1 of the present invention is shown in FIG. The light emitting diode driving device 1 is connected to a three-phase AC power source and includes a full-wave rectifier circuit 11 for full-wave rectifying the three-phase AC. On the output side of the full-wave rectifier circuit 11, a low-pass filter circuit 21 connected to the output terminal of the full-wave rectifier circuit 11, a temperature protection unit 31 connected to the output terminal of the low-pass filter circuit 21, and a temperature protection unit Current limiting means 41 connected to the output terminal 31, an LED unit control circuit connected in series to the current limiting means 41, and an LED unit are provided. Furthermore, a dimming signal insulation circuit 110 connected to the PWM adjustment device via a dimming terminal connector and a signal line is provided.
(Full-wave rectifier circuit 11)

The full-wave rectifier circuit 11 is a circuit that only performs full-wave rectification on a three-phase AC voltage supplied from a three-phase AC power source. The full-wave rectifier circuit 11 includes a first single-phase bridge circuit REC1 in which a diode is bridge-connected between two power lines out of three power lines connected to a three-phase AC power source, and among the three power lines. It comprises only a second single-phase bridge circuit REC2 in which a diode is bridge-connected between the other two power supply lines. The full wave rectifier circuit 11 does not need to be smoothed. This eliminates the need for a smoothing electrolytic capacitor.
(Low-pass filter circuit)

The low-pass filter circuit 21 includes a choke coil L1 connected in series to the output terminal of the full-wave rectifier circuit 11, and a capacitor C5 connected in parallel to the output terminal. The low-pass filter circuit 21 is for suppressing high-frequency noise included in the full-wave rectified voltage. VS1 is a surge voltage protection element, and when a surge voltage (suddenly high voltage) is applied to the power input line, it absorbs the energy and protects the circuit.
(LED part)

  In the present embodiment, the first LED unit 91, the second LED unit 92, and the third LED unit 93 constitute the first LED assembly 101. The first LED unit 91 is divided into a first LED dividing unit 91A, a second LED dividing unit 91B, and a third LED dividing unit 91C that are connected in series with each other. Here, as shown in FIG. 8, the first LED dividing unit 91A, the second LED unit 92, the second LED dividing unit 91B, the third LED unit 93, and the third LED dividing unit 91C are arranged in this order. Connected in series. The third LED unit 93 is connected between the second LED unit 92 and a current limiting unit 41 described later. In addition, the number of LED parts and LED division | segmentation parts which comprise the 1st LED aggregate 101 is not limited to the said structure, It can also be made into 2 pieces or 4 pieces or more. For example, when the second LED unit 92 is the only LED unit connected in series with the first LED unit 91, the first LED unit 91 and the second LED unit 92 can constitute a first LED assembly.

  The second LED assembly 102 has the same configuration as the first LED assembly 101. In the example of FIG. 8, the second LED aggregate 102 has a fourth LED portion 94, a fifth LED portion 95, and a sixth LED portion 96 connected in series. Here, the fourth LED section 94 is divided into a fourth LED dividing section 94A, a fifth LED dividing section 94B, and a sixth LED dividing section 94C that are connected in series with each other. Here, the fourth LED dividing section 94A, the fifth LED section 95, the fifth LED dividing section 94B, the sixth LED section 96, and the sixth LED dividing section 94C are connected in series in this order. . The first LED assembly 101 and the second LED assembly 102 are connected in parallel to each other.

  Since the first LED unit 91 has a longer lighting time than the other LED units (the second LED unit 92 and the third LED unit 93) as described later, the amount of heat generated is increased. For this reason, by dividing the first LED portion 91 and disposing it as an LED dividing portion between the second LED portion 92 and the third LED portion 93 or on the downstream side of the third LED portion 93, the first LED portion 91 diverges uniformly. There are also advantages that can be easily achieved. The fourth LED unit is the same, and the fourth LED unit can be divided and arranged as an LED division between the fifth LED unit and the sixth LED unit or downstream of the sixth LED unit.

Each LED unit is connected in series with a set of two LED elements having a forward voltage of about 3V connected in series. The first LED unit 91 is connected in series with 40 sets of two in series. That is, the first forward voltage Vf1 for lighting the first LED unit 91 is (3V × 2) × 40 = 240V. Specifically, the first LED division unit 91A constituting the first LED unit 91 has 8 sets, the second LED division unit 91B has 8 sets, and the third LED division unit 91C has 24 sets. In addition, since the second LED unit 92 is connected in four groups in series, the second forward voltage Vf2 for lighting the second LED unit 92 is 240V + (3V × 2) × 4 = 240V + 24V = 264V. Further, since the third LED unit 93 is also connected in series in four sets, the third forward voltage Vf3 for lighting the third LED unit 93 is 240V + 24V + (3V × 2) × 4 = 240V + 24V + 24V = 288V. .
(LED control circuit)

  In this embodiment, the LED unit control circuit includes a first LED unit control circuit 51, a second LED unit control circuit 61, a third LED unit control circuit 71, and a fourth LED unit control circuit 81.

  The first LED unit control circuit 51 is first energization control means including a first LED current control transistor Q1 and a first current detection transistor Q9. The first LED current control transistor Q1 is connected in parallel with the second LED unit 92 and connected in series with the first LED dividing unit 91A. The first LED unit control circuit 51 further includes current detection resistors R1 and R2 connected in series with the second LED unit 92, and includes a first LED dividing unit 91A, a second LED dividing unit 91B, and a third LED dividing unit. The energization amount to the part 91C is controlled.

  The second LED unit control circuit 61 is second energization control means including a second LED current control transistor Q2 and a second current detection transistor Q10. The second LED current control transistor Q2 is connected in parallel with the third LED section 93 and connected in series with the second LED dividing section 91B. The second LED unit control circuit 61 further includes current detection resistors R3 and R4 connected in series with the third LED unit 93, and includes a first LED dividing unit 91A, a second LED dividing unit 91B, and a third LED dividing unit. The energization amount to the part 91C and the second LED part 92 is controlled. The second LED unit control circuit 61 is connected to the current limiting means 41 in series.

  The third LED control circuit 71 is third energization control means including a third LED current control transistor Q3 and a third current detection transistor Q11. The third LED current control transistor Q3 is connected in parallel with the fifth LED unit 95 and is connected in series with the fourth LED dividing unit 94A. The third LED control circuit 71 further includes current detection resistors R5 and R6 connected in series with the fifth LED unit 95, and includes a fourth LED dividing unit 94A, a fifth LED dividing unit 94B, and a sixth LED dividing unit. The amount of power to 94C is controlled.

  The fourth LED unit control circuit 81 is fourth energization control means including a fourth LED current control transistor Q4 and a fourth current detection transistor Q12. The fourth LED current control transistor Q4 is connected in parallel with the sixth LED unit 96 and is connected in series with the fourth LED dividing unit 94B. The fourth LED control circuit 81 further includes current detection resistors R7 and R8 connected in series with the sixth LED unit 96. The fourth LED dividing unit 94A, the fifth LED dividing unit 94B, and the sixth LED dividing unit. The energization amount to 94C and the 5th LED part 95 is controlled. The fourth LED control circuit 81 is connected to the current limiting means 41 in series.

  When the light emitting diode driving device is mounted on the substrate, the circuit can be duplicated and arranged in parallel. FIG. 9 shows an example in which light emitting diode driving devices configured in parallel are mounted on a substrate. The light-emitting diode driving device shown in this figure has a first LED driving unit and a second LED driving unit connected in parallel on the output side of the full-wave rectifier circuit 11. The first LED drive unit includes a first LED unit 91, a second LED unit 92, a third LED unit 93, a first energization control unit, a second energization control unit, and a current limiting unit 41. Further, the second LED driving section is also the same as the first LED driving section, the first LED section 91, the second LED section 92, the third LED section 93, the first energization control means, the second energization control means, and the current limiting means. 41 is included.

  On the board | substrate, the area | region which mounts a 1st LED drive part and the area | region which mounts a 2nd LED drive part are isolate | separated. Moreover, the area | region which mounts the 1st LED drive part is further, the area | region which mounts the 1st LED aggregate 101 containing the 1st LED part 91, the 2nd LED part 92, and the 3rd LED part 93, a 1st electricity supply control means, The first drive assembly including the second energization control unit and the current limiting unit 41 is separated from the region for mounting. Similarly, the region for mounting the second LED driving unit includes the region for mounting the first LED assembly 101 including the first LED unit 91, the second LED unit 92, and the third LED unit 93, the first energization control means, The first drive assembly including the second energization control unit and the current limiting unit 41 is separated from the region for mounting.

  And the area | region which mounts the 1st LED drive part on a board | substrate, and the area | region which mounts a 2nd LED drive part are arrange | positioned side by side. Here, the region for mounting the first drive assembly and the region for mounting the second drive assembly are close to each other, the region for mounting the first LED assembly 101, and the region for mounting the second LED assembly 102. And the region where the first LED driving unit is mounted and the region where the second LED driving unit is mounted are arranged so that the two are separated from each other.

  Thus, the 1st LED aggregate 101 and the 2nd LED aggregate 102 can be connected in parallel, as shown in FIG. 9 shows a first LED assembly 101, a second LED assembly 102, a first LED unit control circuit 51 having a first energization control means, a second LED unit control circuit 61 having a second energization control means, and a third It is the schematic of the state which mounted in the board | substrate 103 the 3rd LED part control circuit 71 provided with an electricity supply control means, and the 4th LED part control circuit 81 provided with the 4th electricity supply control means. In plan view of the substrate 103, the first energization control means and the third energization control means are such that the first energization control means is adjacent to the first LED assembly 101 and the third energization control means is adjacent to the second LED assembly 102. As such, it is preferable that the first LED assembly 101 and the second LED assembly 102 are disposed. In addition, the board | substrate 103 has a longitudinal direction and a transversal direction, and the 1st LED assembly 101 and the 2nd LED assembly 102 are mounted along the longitudinal direction of the board | substrate 103, respectively.

  By such an arrangement, the wiring of the first LED unit control circuit 51 and the second LED unit control circuit 61 intersects with the wiring of the third LED unit control circuit 71 and the fourth LED unit control circuit 81. The wiring of the first LED unit control circuit 51 and the second LED unit control circuit 61 can be connected to the first LED assembly 101, and the wiring of the third LED unit control circuit 71 and the fourth LED unit control circuit 81. Can be connected to the second LED assembly 102. Thereby, it can arrange | position in order and the member for making wiring cross | intersect becomes unnecessary.

  In addition, since the current limiting means 41 is duplicated and arranged in the first LED drive unit and the second LED drive unit, a large voltage is applied, so FETs, transistors, etc. that require high durability By dispersing the driving elements in a plurality of elements, an effect of reducing the cost can be obtained.

In the light emitting diode driving device 1 according to the present embodiment, the output line OL for connecting the LED units in series and the control line CL for connecting the LED unit control circuits in series are connected approximately in parallel to each other in two locations. doing. Thus, the circuit configuration can be simplified by connecting the plurality of LED units and the LED unit control circuit in parallel, the wiring pattern can be simplified, and the necessary number of conductors and pattern length can be reduced.
(Temperature protector 31)

  The temperature protection unit 31 is a transistor having a base connected to the midpoint of a series circuit of resistors R27, R28 and a posistor R29 connected in parallel to the output terminal of the low-pass filter circuit 21, and a series circuit of the resistors R27, R28 and posistor R29. Q17, the first LED division unit 91A, the second LED unit 92, the second LED division unit 91B, the third LED unit 93, the third LED division unit 91C, the fourth LED division unit 94A, the fifth LED unit 95. This is a circuit for limiting an abnormal temperature rise of the LED elements of the fifth LED dividing section 94B, the sixth LED section 96, and the sixth LED dividing section 94C. Resistors R27 and R28 are base resistances of the transistor Q17, and are for inputting a current component to the base to stabilize the operation of the transistor Q17. The posistor R29 is an element whose resistance value rapidly increases when the temperature reaches a certain value.

  The operation of the temperature protection unit 31 is as follows. When the temperature of the substrate on which the LED unit is mounted reaches a very high temperature, the resistance value of the posistor R29 increases abruptly. Therefore, the voltage across the terminals of the posistor R29 (the voltage between the base and emitter of the transistor Q17) To rise. When the inter-terminal voltage of the posistor R29 exceeds the base voltage Vbe, the transistor Q17 is turned on, and the gate voltages of the field effect transistors Q5 and Q6 in the current limiting means 41 become 0 V, so that the field effect transistors Q5 and Q6 The LED elements of the first LED dividing unit 91A, the second LED unit 92, the second LED dividing unit 91B, the third LED unit 93, and the third LED dividing unit 91C are turned off. When the LED element is turned off and the temperature of the substrate is lowered to a certain temperature, the resistance value of the posistor R29 is reduced and the voltage across the terminals of the posistor R29 is lowered to become less than the base voltage Vbe of the transistor Q17. The field effect transistors Q5 and Q6 are turned on, and the LED elements of the first LED dividing unit 91A, the second LED unit 92, the second LED dividing unit 91B, the third LED unit 93, and the third LED dividing unit 91C are turned on. Relight.

When the inter-terminal voltage of the posistor R29 exceeds the base voltage Vbe, the transistor Q17 is turned on, and the gate voltages of the field effect transistors Q7, Q8 in the current limiting means 41 become 0 V, so that the field effect transistors Q7, Q8 are The LED elements of the fourth LED dividing section 94A, the fifth LED section 95, the fifth LED dividing section 94B, the sixth LED section 96, and the sixth LED dividing section 94C are turned off. When the LED element is turned off and the temperature of the substrate is lowered to a certain temperature, the resistance value of the posistor R29 is reduced and the voltage across the terminals of the posistor R29 is lowered to become less than the base voltage Vbe of the transistor Q17. The field effect transistors Q7 and Q8 are turned off, and the LED elements of the fourth LED dividing unit 94A, the fifth LED unit 95, the fifth LED dividing unit 94B, the sixth LED unit 96, and the sixth LED dividing unit 94C are turned on. Relight. By performing the above operation, the first LED division unit 91A, the second LED unit 92, the second LED division unit 91B, the third LED unit 93, the third LED division unit 91C, the fourth LED division unit 94A, Abnormal temperature rise in the five LED units 95, the fifth LED dividing unit 94B, the sixth LED unit 96, and the sixth LED dividing unit 94C is suppressed (LED current control transistor).

  The first LED current control transistor Q1, the second LED current control transistor Q2, the third LED current control transistor Q3, and the fourth LED current control transistor Q4 are members for constant current driving corresponding to each LED unit. And a switching element such as a transistor. In particular, FETs are preferable because the saturation voltage between the source and the drain is almost zero, and the amount of current supplied to the LED portion is not hindered. However, it is needless to say that the present invention is not limited to the FET, and can be configured by a bipolar transistor or the like.

  The second LED unit 92, the third LED unit 93, the fifth LED unit 95, and the sixth LED unit 96 include a first LED current control transistor Q1, a second LED current control transistor Q2, and a third LED current control transistor Q3, respectively. The fourth LED current control transistor Q4 is connected in parallel. Each LED current control transistor is switched between ON state and constant current control according to the amount of current flowing through the LED unit.

  When the LED current control transistor is turned off, no current flows through the bypass path, and the LED portion is energized. That is, the amount of current bypassed by the first LED current control transistor Q1, the second LED current control transistor Q2, the third LED current control transistor Q3, and the fourth LED current control transistor Q4 can be adjusted. It is possible to control the energization amount. In the example of FIG. 8, the first LED current control transistor Q1 is connected in parallel with the second LED unit 92, and the first bypass path BP1 is formed. In addition, the second LED current control transistor Q2 is connected in parallel with the third LED section 93 to form a second bypass path BP2. Further, a third LED current control transistor Q3 is connected in parallel with the fifth LED unit 95, and a third bypass path BP3 is formed. A fourth LED current control transistor Q4 is connected in parallel with the sixth LED unit 96 to form a fourth bypass path BP4. Furthermore, the fifth LED current control transistor Q5 and the sixth LED current control transistor Q6 are connected, and the first LED dividing unit 91A, the second LED unit 92, the second LED dividing unit 91B, the third LED unit 93, and the third LED dividing unit. The energization amount of the part 91C is controlled. The seventh LED current control transistor Q7 and the eighth LED current control transistor Q8 are connected, and the fourth LED dividing unit 94A, the fifth LED unit 95, the second LED dividing unit 94B, the sixth LED unit 96, and the sixth LED dividing unit. The energization amount of 94C is controlled.

Here, since the first LED unit 91 (the first LED dividing unit 91A, the second LED dividing unit 91B, and the third LED dividing unit 91C) is always turned on, there is no need to perform bypass, and bypass paths connected in parallel. No LED current control transistor is provided. The fourth LED unit 94 is the same.
(Current detection transistor)

The first current detection transistor Q9, the second current detection transistor Q10, the third current detection transistor Q11, and the fourth current detection transistor Q12 are respectively a first LED current control transistor Q1, a second LED current control transistor Q2, and a third LED current. This is a member that is connected in series to the control transistor Q3 and the fourth LED current control transistor Q4, and controls to perform constant current driving at an appropriate timing. As the current detection transistor, for example, a bipolar transistor can be used.
(Current detection means)

  The current detection means includes current detection resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, and R12. The current detection resistors R1 and R2 detect a current flowing through the first LED current control transistor Q1 in addition to detecting a current passed through the second LED unit 92. As described above, the current detection resistors R1 to R8 and R9 to R12 detect the current flowing through the output line OL. By setting the resistance value of the current detection resistor to R1 = R2 = R5 = R6> R3 = R4 = R7 = R8, a difference is provided in the detected current value, and the first LED current control transistor Q1 and the second LED current control The transistor Q2 and the like are configured to operate in a timely manner. Specifically, the first current detection transistor Q9 and the first LED current control transistor Q1 are operated with the detection values of the current detection resistors R1 and R2, while the second current is detected with the detection values of the current detection resistors R3 and R4. The detection transistor Q10 and the second LED current control transistor Q2 are operated.

In FIG. 8, a current detection resistor is provided for each LED unit. However, the present invention is not limited to this, and a single current detection resistor can be used as a common current detection resistor in a plurality of LED units. . That is, the circuit configuration can be simplified by controlling each LED unit control circuit based on the current amount of the common current detection resistor.
(Current limiting means)

  The current limiting means 41 is connected in parallel to the middle point of resistors R25 and R26 and a Zener diode D5 connected in parallel to the output terminal of the low-pass filter circuit 21 and the series circuit of resistors R25, R26 and Zener diode D5. A circuit in which the resistors R21, R22 and the fifth current detection transistor Q13, the sixth current detection transistor Q14 are connected in series, and the resistors R21, R22, the fifth current detection transistor Q13, and the sixth current detection transistor Q14, respectively. The fifth LED current control transistor Q5, the sixth LED current control transistor Q6, and the fifth LED current control transistor Q5, the sixth LED current control transistor Q6, whose gate is connected to the midpoint of the series connected circuit, are connected in series. Circuit comprising current sensing resistors R9 and R10 . The circuit of the first LED aggregate 101, the fifth LED current control transistor Q5, and the resistor R9, and the circuit of the first LED aggregate 101, the sixth LED current control transistor Q6, and the resistor R10 are output terminals of the low-pass filter circuit 21. Are connected in parallel.

The current limiting means 41 further includes a circuit in which resistors R23 and R24 connected in parallel to the midpoint of the series circuit of resistors R25 and R26 and a Zener diode D5 and transistors Q15 and Q16 are connected in series, and resistors R23 and R24, respectively. The seventh LED current control transistor Q8, the eighth LED current control transistor Q8, and the eighth LED current control transistor Q8, the gate of which is connected to the midpoint of the circuit in which the seventh current detection transistor Q15 and the eighth current detection transistor Q16 are connected in series. A circuit including current detection resistors R11 and R12 connected in series to the seventh LED current control transistor Q7 and the eighth LED current control transistor Q8 is provided. The circuit of the second LED assembly 102, the seventh LED current control transistor Q7, the current detection resistor R11, and the circuit of the second LED assembly 102, the eighth LED current control transistor Q8, the current detection resistor R12 are low-pass filter circuits. 21 output terminals are connected in parallel. In this way, the circuit configuration divided into the first LED assembly 101 and the second LED assembly 102 allows the wiring between the current limiting means 41 and the first LED assembly 101 and the second LED assembly 102 to be reduced. It is possible to obtain an orderly appearance by preventing crossing.
(Reference current value)

Here, the first current detection transistor Q9 switches the first LED current control transistor Q1 from ON to OFF, and the third current detection transistor Q11 switches the third LED current control transistor Q3 from ON to OFF. The second current detection transistor Q10 switches the second LED current control transistor Q2 from ON to OFF, and the fourth current detection transistor Q12 lowers than the second reference current value that switches the fourth LED current control transistor Q4 from ON to OFF. Set. By setting the first reference current value to be smaller than the second reference current value in this way, the second LED unit 92 and the third LED unit 93 can be connected to each other as the input voltage rectified by the rectifier circuit 11 increases. Can be lit in order. Further, when the input voltage decreases, the order is reversed (that is, the third LED unit 93 and the second LED unit 92 are turned off in this order). Similarly, as the input voltage rectified by the rectifier circuit 11 increases, the fifth LED unit and the sixth LED unit can be lit in this order. When the input voltage is lowered, the order is reversed (that is, the sixth LED unit and the fifth LED unit are turned off in this order).
(Dimming signal isolation circuit 110)

The dimming signal isolation circuit 110 is a circuit for insulating the PWM dimming signal to prevent a high voltage of three-phase alternating current from being applied to the PWM dimming device. The photocoupler IC1 and the light emission of the photocoupler IC1 And a current limiting resistor R30. When the photocoupler IC1 is turned on by the PWM dimming signal, the gate voltages of the fifth LED current control transistor Q5, the sixth LED current control transistor Q6, the seventh LED current control transistor Q7, and the eighth LED current control transistor Q8 are 0V. Therefore, the fifth LED current control transistor Q5, the sixth LED current control transistor Q6, the seventh LED current control transistor Q7, and the eighth LED current control transistor Q8 are turned off, and the LED portion is turned off. When the photocoupler IC1 is turned off, the fifth LED current control transistor Q5, the sixth LED current control transistor Q6, the seventh LED current control transistor Q7, and the eighth LED current control transistor Q8 are turned on, and the LED portion is lit.
(Example of normal operation of the first embodiment)

  Hereinafter, in the circuit example of FIG. 8, the first LED current control transistor Q1 and the second LED current control transistor in the case of inputting the pulsating voltage shown in FIG. 3 obtained by rectifying the three-phase alternating current shown in FIG. The operation of Q2, the fifth LED current control transistor Q5, and the sixth LED current control transistor Q6 will be described. The operations of the third current control transistor Q3, the fourth LED current control transistor Q4, the seventh LED current control transistor Q7, and the eighth current control transistor Q8 are the same as those of the first LED current control transistor Q1 and the second LED current control transistor. Since it is basically the same as Q2, the fifth LED current control transistor Q5, and the sixth LED current control transistor Q6, description thereof will be omitted.

  Here, an example in which the rated voltage is 220 V and an AC voltage having a rated voltage of 220 V is input from a three-phase AC power supply will be described with reference to FIGS. 10 and 11. FIG. 10 is a graph showing a voltage waveform of a pulsating voltage obtained by rectifying AC220V three-phase alternating current by the rectifier circuit 11 and a voltage applied to the LED unit according to the present embodiment. FIG. 11 shows the luminous flux obtained by the light emitting diode driving apparatus according to the present embodiment in the case of AC220V.

  When full-wave rectification is performed on a three-phase AC voltage having a rating of 220 V, the instantaneous voltage pulsates in the range of 269 V to 311 V. Therefore, the minimum pulsating voltage is 269V and the maximum pulsating voltage is 311V. As described above, since the second forward voltage Vf2 ″ is set to 264 V, it is lower than the minimum pulsating voltage, and in the vicinity of the minimum pulsating voltage shown in FIG. The unit 92 is turned on, and in this state, the first LED current control transistor Q1, which is the first energization control means, is always in the OFF state.

  However, in a region where the pulsating voltage is 288 V or less which is the third forward voltage Vf3 ″ at which the third LED unit 93 is lit, the third LED unit 93 is not lit. The first LED unit 91 and the second LED unit. During the period when 92 is lit, the constant current operation is performed by the second LED current control transistor Q2 which is the second energization control means, and even if the pulsating voltage increases, the current flowing through the LED portion does not increase. The current control transistor Q2 detects the LED current flowing through the LED section with current detection resistors R3 and R4 which are current detection means, and controls ON / OFF and constant current operation with this value.

  Next, when the pulsating voltage rises, the second LED current control transistor Q2, which is the second energization control means, drives the first LED unit 91 and the second LED unit 92 with a constant current. When the pulsating voltage further rises to reach 288 V, which is the third forward voltage Vf3 ″, current starts to flow through the third LED section 93, and the current exceeds the current limit value of the second LED current control transistor Q2. As a result, the second LED current control transistor Q2 is switched from the constant current operation to OFF, whereby all of the first LED portion 91, the second LED portion 92, and the third LED portion 93 are lit. At this time, the first LED unit 91, the second LED unit 92, and the third LED unit 93 are lit at a constant current by the current limiting means 41.

When the pulsating voltage decreases to the third forward voltage Vf3 ″, the third LED portion 93 is turned off again, the second LED current control transistor Q2 starts constant current operation, and the current value of the LED portion is kept constant. Thus, the first LED portion 91 and the second LED portion 92 are always lit, and only the third LED portion 93 is in a blinking state that repeats ON / OFF according to the instantaneous value of the pulsating voltage. The luminous flux emitted from the LED unit at this time is as shown in Fig. 11 and periodically decreases, but all the LED units are not turned off and are always lit. By setting R1, R2, R3, R4, R9, R10 and LED current detection transistors Q9, Q10, Q13, Q14, the level for constant current driving can be freely set.
(Example of operation when voltage drops in Example 1)

  Next, the operation when the voltage of the three-phase AC power supply fluctuates and fluctuates from AC220V, which is the rated voltage, to AC200V will be described based on FIG. 12 and FIG. FIG. 12 is a graph showing a voltage waveform of a pulsating voltage obtained by rectifying AC200V three-phase alternating current by the rectifier circuit 11 and a voltage applied to the LED unit according to the present embodiment. FIG. 13 shows the luminous flux obtained by the light emitting diode driving apparatus according to the present embodiment in the case of AC200V. The instantaneous voltage of the pulsating voltage obtained by full-wave rectification of AC 200V varies in the range of 245V to 283V. Also in this case, since the first forward voltage Vf1 ″ = 240V is set lower than 245V, which is the reduced minimum pulsating voltage of the reduced pulsating voltage, the first LED unit 91 has the reduced pulsating voltage. On the other hand, since the third forward voltage Vf3 ″ = 288 V is lower than the 283 V of the reduced maximum pulsating voltage, the third LED unit 93 changes to the instantaneous value of the declining pulsating voltage. It will always be turned off regardless. Therefore, the second LED unit 92 blinks in accordance with the instantaneous value of the reduced pulsating voltage.

  Specifically, as shown in FIGS. 12 and 13, in a section where the reduced pulsating voltage is lower than the second forward voltage, the first LED current control transistor Q1 performs constant current control, and the first LED unit Only 91 is lit. Even if the drop pulsating voltage increases, the current flowing through the first LED unit 91 does not increase. The first LED current control transistor Q1 detects the LED current flowing through the first LED unit 91 with current detection resistors R1 and R2 which are current detection means, and controls ON / OFF and constant current operation with this value.

  Next, when the pulsating voltage rises, the first LED current control transistor Q1, which is the first energization control means, drives the first LED unit 91 with a constant current. When the pulsating voltage further rises and reaches the second forward voltage Vf2 ″ = 264V, current begins to flow through the second LED section 92, and the current increases beyond the current limit value of the first LED current control transistor Q1. As a result, the first LED current control transistor Q1 is switched from the constant current operation to OFF, thereby turning on the first LED unit 91 and the second LED unit 92. The two LED units 92 are lit at a constant current by the current limiting means 41.

  Then, when the pulsating voltage decreases and becomes equal to or lower than the second forward voltage Vf2 ″, the second LED portion 92 is turned off again, the first LED current control transistor Q1 starts constant current operation, and the LED current is set to a constant value. In this way, the first LED unit 91 is always turned on, the third LED unit 93 is always turned off, and only the second LED unit 92 blinks repeatedly ON / OFF according to the instantaneous value of the reduced pulsating voltage. At this time, the luminous flux emitted from the LED unit is as shown in Fig. 13 and periodically decreases, but all the LED units are not turned off, and the lighting is always maintained.

As described above, by configuring the LED units in a plurality of stages that can be individually turned on / off, a highly efficient operation with particularly reduced loss of the drive element is realized. For example, in a light-emitting diode driving device in which LED elements as shown in FIG. 18 are connected in series, that is, in a single stage, if it is always lit even when the voltage fluctuates (AC 200 V), as shown in the graph of FIG. 14A. Therefore, it is necessary to design so that all the LED elements are lit at the reduced minimum pulsating voltage (245V). In this case, a voltage that is not used for driving the LED element is a region indicated by hatching in the figure, and is consumed as heat generated by a driving element such as a diode. At the rated time (AC220V), the drive loss increases as shown in FIG. 14B, and when the power supply voltage fluctuates and rises (AC240V), the loss further increases as shown in FIG. 14C. On the other hand, in the first embodiment, as indicated by the oblique lines in the graphs of FIGS. 10 and 12, a highly efficient operation with little loss is realized even at the time of rating and voltage fluctuation.
(Comparative Example 1)

  As Comparative Example 1, the driving loss was calculated when 40 sets of LED elements were used and a three-phase AC power source was connected in the LED driving device shown in FIG. As a result, the driving loss of Comparative Example 1 was 11 W at AC 200 V, 22 W at AC 220 V, and 33 W at AC 240 V. On the other hand, in the light emitting diode driving device according to Example 1, the power consumption is 5 W at AC 200 V, 6 W at AC 220 V, and 13 W at AC 240 V, and the loss is reduced by 55%, 73%, and 61% compared to Comparative Example 1. A reduction in drive loss leads to a reduction in the amount of heat generated by the drive element, and also leads to an improvement in device reliability. For example, considering voltage resistance, it is desirable that the substrate is an insulating resin substrate. However, since the resin substrate is inferior in heat dissipation, it is disadvantageous when the amount of heat generated is large. On the other hand, use of such a resin substrate becomes possible by reducing the heat generation amount.

In the above configuration, the number of LED units is three, but the number of LED units can be two, or four or more. If the number of LED units is 4 or more, for example, when the three-phase AC voltage of AC220V fluctuates and the input voltage rises to 240V, the first LED unit 91 to the third LED unit 93 are always lit and according to the voltage waveform The added fourth LED unit can be blinked. In this way, when the rated voltage is AC220V, even if the voltage fluctuates within the range of 220V ± 20V, for example, it is possible to perform control while suppressing drive loss.
(Comparative Example 2)

  Further, for comparison, drive loss when the light emitting diode driving device is driven using a single-phase AC power supply will be described with reference to FIGS. 15 and 16A to 16F. Here, the pulsating current voltage and the LED when the power supply voltage is changed by connecting to the two-stage light emitting diode driving apparatus 1500 according to Comparative Example 2 shown in FIG. The current was measured. 16A is a graph showing the pulsating voltage and LED voltage when the LED driving device 1500 of FIG. 15 is driven by AC 200V, and FIG. 16B is a graph showing the pulsating voltage and LED voltage when driving by AC 220V. 16C is a graph showing the pulsating voltage and the LED voltage when driven at 240 V AC, FIG. 16D is a graph showing the luminous flux in FIG. 16A, FIG. 16E is a graph showing the luminous flux in FIG. 16B, and FIG. It is a graph which shows a light beam. A region indicated by a broken line in FIGS. 16A to 16C is a drive loss. The drive loss of Comparative Example 2 was 10 W at AC 200 V, 12 W at AC 220 V, and 18 W at AC 240 V, and it was confirmed that all of Examples 1 realized low drive loss.

  Further, when the single-phase AC power supply is rectified, a region of 0 V is generated, and thus a non-lighting period occurs as shown in FIGS. 16D to 16F. As a result, flickering becomes noticeable and the quality of light emission also decreases. As shown in FIGS. 17A and 17B, the average value of the luminous flux was 15540 lm in Comparative Example 2 and 16370 lm in Example 1, and it was confirmed that Example 1 was superior when viewed in terms of the average value. In particular, as shown in FIG. 17A, since the difference between the peak time and the non-lighting time is large in Comparative Example 2, the degree of flicker is conspicuous. On the other hand, in Example 1, these differences are extremely small, and flatter and uniform light emission can be obtained.

  Thus, even when the rated voltage of the three-phase alternating current fluctuates, it is possible to reduce the drive loss by effectively using the power. In addition, an alternating voltage fluctuating with respect to the rated voltage from the three-phase alternating current power supply is input to the full-wave rectifier circuit 11, and the first LED portion is always lit even if the alternating voltage fluctuates, so that a high quality lighting device can be realized. . In addition, since the full-wave rectified voltage waveform has no section where 0 V is applied, flickering can be prevented and it is not necessary to provide a smoothing electrolytic capacitor. Furthermore, a high-quality fishing light can be realized by using the light emitting diode driving device according to the present embodiment. Thereby, the discomfort caused by flickering of illumination light with high illuminance held by an operator working under an LED fishing light can be reduced.

  The light emitting diode driving device according to the present invention can realize a high-quality lighting device that prevents flickering. Furthermore, it can be used as a high-quality fishing light.

DESCRIPTION OF SYMBOLS 1, 100, 200, 1500 ... Light-emitting-diode drive device 11, 111, 111 '... Full wave rectifier circuit 21 ... Low-pass filter circuit 31 ... Temperature protection part 41, 141, 141' ... Current limiting means 51 ... First LED part control Circuit 61 ... Second LED part control circuit 71 ... Third LED part control circuit 81 ... Fourth LED part control circuit 190 ... First LED aggregate 91, 191, 191 '... First LED part; 91A ... First LED division Part; 91B ... second LED division part; 91C ... third LED division part 92, 192, 192 '... second LED part 93, 193' ... third LED part 94 ... fourth LED part; 94A ... fourth LED division Part; 94B ... fifth LED division part; 94C ... sixth LED division part 95 ... fifth LED part 96 ... sixth LED part 101 ... first LED assembly 102 ... second LED assembly 103 ... substrate 104; 04 '... current detection unit 110 ... dimming signal insulation circuit 122 ... LED
123 ... transistors 151, 151 '... first current control means 152' ... second current control means AP ... three-phase AC power supply 1Φ ... single-phase AC power supplies Vf1, Vf1 ', Vf1 "... first forward voltages Vf2, Vf2' , Vf2 "... second forward voltage Vf3 ', Vf3" ... third forward voltage BP1 ... first bypass path BP2 ... second bypass path BP3 ... third bypass path BP4 ... fourth bypass path OL ... output line Q1 ... First LED current control transistor Q2 ... Second LED current control transistor Q3 ... Third LED current control transistor Q4 ... Fourth LED current control transistor Q5 ... Fifth LED current control transistor Q6 ... Sixth LED current control transistor Q7 ... Seventh LED current control transistor Q8 ... eighth LED current control transistor Q9 ... first current detection transistor Q10 ... second current Output transistor Q11 ... Third current detection transistor Q12 ... Fourth current detection transistor Q13 ... Fifth current detection transistor Q14 ... Sixth current detection transistor Q15 ... Seventh current detection transistor Q16 ... Eighth current detection transistor Q17 ... Transistor R1 ... Current Detection resistor R2 ... Current detection resistor R3 ... Current detection resistor R4 ... Current detection resistor R5 ... Current detection resistor R6 ... Current detection resistor R7 ... Current detection resistor R8 ... Current detection resistor R9 ... Current detection resistor R10 ... Current detection resistor R11 ... Current Detection resistor R12 ... Current detection resistor R17 ... First transistor load resistor R18 ... Second transistor load resistor R19 ... Third transistor load resistor R20 ... Fourth transistor load resistor R21 ... Resistor R22 ... Resistor R23 ... Resistor R24 ... Resistor R25 ... Resistor R26 ... resistor R27 ... resistor R28 ... Resistance R29 ... Posista

Claims (7)

A full-wave rectifier circuit connected to a three-phase AC power source to obtain a rectified voltage by full-wave rectifying the AC voltage of the three-phase AC power source;
A first LED unit including at least one LED element connected in series with the output side of the full-wave rectifier circuit;
A second LED unit including at least one LED element connected in series with the first LED unit;
A first energization control means for controlling the energization amount to the first LED unit, connected in parallel with the second LED unit and in series with the first LED unit;
The first LED unit and the second LED unit are connected in series, and includes a current limiting unit for controlling the amount of current supplied to the first LED unit and the second LED unit,
The first forward voltage for lighting the first LED unit is lower than the second forward voltage for lighting the first LED unit and the second LED unit, and the first LED unit is lit. A light emitting diode driving device in which a first forward voltage is set to be equal to or lower than a minimum pulsating voltage at which a rectified voltage at which a voltage value pulsates is minimized. The light emitting diode driving device according to claim 1, further comprising:
A third LED unit including at least one LED element connected in series with the first LED unit and the second LED unit;
Second energization for controlling the energization amount to the first LED part and the second LED part, which is connected in parallel with the third LED part and in series with the first LED part and the second LED part. Control means,
The second forward voltage is set to be equal to or lower than the rated minimum pulsating voltage when the effective voltage of the three-phase AC power supply is a rated value,
The third forward voltage for lighting the first LED unit, the second LED unit, and the third LED unit is the rated minimum pulsating voltage when the voltage of the three-phase AC power supply is the rated value, and the voltage value is pulsating. Is set between the rated maximum pulsating voltage and the maximum rectified voltage
A light-emitting diode driving device in which the first forward voltage is set to be equal to or lower than a reduced minimum pulsating voltage when the effective voltage of a three-phase AC power supply is reduced to a reduced effective voltage that is lower than a rated value. The light-emitting diode driving device according to claim 2,
The light-emitting diode driving device, wherein the reduced effective voltage is a value lower than the rated voltage by 5% to 25% of the rated voltage. The light-emitting diode driving device according to any one of claims 1 to 3,
The first LED part is divided into a first LED split part and a second LED split part connected in series with each other,
A light-emitting diode driving device in which the second LED unit is connected between the first LED dividing unit and the second LED dividing unit. The light-emitting diode driving device according to any one of claims 1 to 4, further comprising:
Similarly, on the output side of the full-wave rectifier circuit, the first LED unit and the second LED unit, and the first LED unit connected in parallel with the first LED driving unit including the first energization control unit and the current limiting unit And the second LED unit, and the second LED driving unit including the first energization control means and the current limiting means,
A board on which the first LED driving unit and the second LED driving unit are mounted;
On the substrate,
A region for mounting the first LED driving unit;
The area where the second LED driving unit is mounted is separated,
Furthermore, in the area where the first LED driving unit is mounted,
A region for mounting the first LED assembly including the first LED unit and the second LED unit constituting the first LED driving unit;
A region for mounting the first drive assembly including the first energization control means and the current limiting means constituting the first LED drive unit is separated,
Furthermore, in the area where the second LED driving unit is mounted,
A region for mounting the second LED assembly including the first LED unit and the second LED unit constituting the second LED driving unit;
A region for mounting the second drive assembly including the first energization control means and the current limiting means constituting the second LED drive unit is separated,
The region for mounting the first LED driving unit and the region for mounting the second LED driving unit on the substrate are:
The area for mounting the first drive assembly and the area for mounting the second drive assembly are close to each other,
The light emitting diode drive device mounted in the attitude | position which the area | region which mounts said 1st LED assembly, and the area | region which mounts a 2nd LED assembly move away from each other.   A fishing lamp driven by the light-emitting diode driving device according to claim 1.   Illumination driven by the light emitting diode driving device according to any one of claims 1 to 5.

Images