JP2018092721A - Light-emitting diode drive device, and lighting apparatus and fishing light using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress flickers of a light-emitting diode drive device lightened by an AC power supply.MEANS FOR SOLVING THE PROBLEM: A light-emitting diode drive device comprises: a second half-wave rectification circuit 52 connected with a common AC power supply, and that performs half-wave rectification of an AC voltage of the AC power supply at a different timing from a first half-wave rectification circuit 51 to obtain a second rectification voltage; a sixth energization controller 26 connected in parallel to a first LED part 11 and in series to a second LED part 12 when seen from the second LED part 12, and configured to control an energization amount to the second LED part 12 in a state applied with the second rectification voltage; a fifth energization controller 25 series-connected between an output side of the second half-wave rectification circuit 52 and the first LED part 11, and configured to control an energization amount to the first LED part 11 and the second LED part 12 in a state applied with the second rectification voltage; and a second current controller 32 configured to control the fifth energization controller 25 and the sixth energization controller 26 on the basis of a current value flowing in the second LED part 12 in a state applied with the second rectification voltage.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light emitting diode driving device, and an illumination and fishing light using the same.

  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 have the advantage of being small, strong in impact resistance, and having a long life.

  As such a power source for lighting equipment, it is desirable to use an AC power source such as a commercial power source. On the other hand, the LED is a DC drive element and emits light only with a forward current.

  In order to meet these conflicting conditions, various LED drive circuits using an AC power supply have been proposed. For example, a method of switching LEDs so as to change the total value of Vf according to a changing voltage value has been proposed (Patent Document 1). In this method, as shown in the circuit diagram of FIG. 10, the LEDs connected in series in multiple stages are divided into blocks 161, 162, 163, 164, 165, and 166, and the LED block according to the voltage value of the input voltage of the rectified waveform. The total value of Vf is changed stepwise by switching the connection of 161 to 166 with a switch control unit 167 constituted by a microcomputer. As a result, since the LED can be lit with a plurality of square waves with respect to the rectified waveform as in the voltage waveform shown in the timing chart of FIG. 11, the LED utilization efficiency is improved compared to the ON duty with only a single square wave. Can improve.

  However, in this LED drive circuit, since the AC waveform is full-wave rectified by the diode bridge circuit, the peak value of the voltage changes periodically, and as a result, the lighting periods of the LEDs configured in multiple stages are different. As a result, the lighting period of some LEDs is long and the lighting periods of other LEDs are shortened, resulting in a problem of uneven light emission. Specifically, as shown in FIG. 11, while the lighting period of the first LED is the longest, the lighting period of the sixth LED is the shortest, and the operating rate is about 10% with respect to the first LED. . Thus, as a result of unevenness in lighting time for each LED, for example, the LED is disposed in a relatively large area, and is not suitable for applications requiring uniform illumination illuminance, such as backlight illumination and signboard illumination.

  On the other hand, in Patent Document 2, as shown in FIG. 12, switches for bypassing the current flowing through the light emitting blocks 171, 172, 173, 174 are arranged in parallel with the switch block SB including the switches SB_1 to SB_3 arranged in series. An AC drive LED lighting device including a switch block SA including the switches SA_1 to SA_3 is disclosed. In this AC-driven LED lighting device, (1) in the odd-numbered rectification cycle, a continuous lighting method is performed in which lighting is performed with priority from the lower numbered light emitting blocks (that is, from the left light emitting block 171 with reference to the drawing). . For this purpose, all the switch blocks SB arranged in series are cut off, and lighting is performed using the switch blocks SA arranged in parallel. (2) In the even-numbered rectification cycle, a continuous lighting method in which lighting is performed with priority from the higher-numbered light-emitting blocks (that is, from the right light-emitting block 174 with reference to the drawing) is performed. For this purpose, all the switch blocks SA arranged in parallel are cut off, and lighting is performed using the switch blocks SB arranged in series.

  According to this configuration, it is possible to program the lighting period of an arbitrary light-emitting block, but the control for switching the switches is complicated, and a complicated switch control logic 177 is required due to the effect.

JP 2006-147933 A Special table 2014-503958 gazette

  An object of the present invention is to improve a light emitting diode driving apparatus using an AC power source, and illumination and fishing lights using the same.

  In order to achieve the above object, a light emitting diode driving apparatus according to one aspect of the present invention is connected to an AC power supply and half-wave rectifies the AC voltage of the AC power supply to obtain a first rectified voltage. First half wave rectifier circuit, a first LED part including at least one LED element connected in series with the output side of the first half wave rectifier circuit, and connected in series with the first LED part In addition, the second LED unit including at least one LED element, the first LED in parallel with the second LED unit, and connected in series with the first LED unit, the first rectified voltage being applied. A first energization control unit for controlling an energization amount to the LED unit, and the first LED unit connected in series with the first LED unit and the second LED unit in a state where a first rectified voltage is applied. And second energization for controlling the energization amount to the second LED section And a first current control unit for controlling the first energization control unit and the second energization control unit based on a current value flowing through the first LED unit in a state where the first rectified voltage is applied. And a second half-wave rectifier circuit that is connected to a common AC power source and obtains a second rectified voltage by half-wave rectifying the AC voltage of the AC power source at a timing different from that of the first half-wave rectifier circuit; A sixth energization control for controlling the energization amount to the second LED unit in a state where a second rectified voltage is applied in parallel with the first LED unit and in series with the second LED unit. And the first LED unit connected in series with the first LED unit between the output side of the second half-wave rectifier circuit and the first LED unit in a state where a second rectified voltage is applied. And a fifth energization control unit for controlling the energization amount to the second LED unit, and a second rectified voltage In a state of being pressurized, can be provided with said second of the LED unit on the basis of the current flowing, the fifth power supply controller and the second current control unit for controlling the sixth power supply control unit.

  According to a light emitting diode driving device according to another aspect of the present invention, a first half-wave rectifier circuit connected to an AC power source and half-wave rectifying the AC voltage of the AC power source to obtain a first rectified voltage; A first LED unit including at least one LED element connected in series with the output side of the first half-wave rectifier circuit; and at least one LED element connected in series with the first LED unit. A second LED unit, a third LED unit including at least one LED element connected in series with the second LED unit, in parallel with the second LED unit, and connected in series with the first LED unit The first energization control unit for controlling the energization amount to the first LED unit in a state where the first rectified voltage is applied, and the first LED unit and the second LED unit are connected in series. In the state where the first rectified voltage is applied, the first LED unit And a second energization control unit for controlling the energization amount to the second LED unit, and a first rectified voltage connected in series with the first LED unit, the second LED unit, and the third LED unit is applied. In a state where the first LED unit, the second LED unit, and the third LED unit are controlled, a third energization control unit for controlling the energization amount, and a first rectified voltage is applied to the first LED A first current control unit for controlling the first energization control unit, the second energization control unit and the third energization control unit based on a current value flowing through the unit, and a common AC power source connected to the AC A second half-wave rectifier circuit for obtaining a second rectified voltage by half-wave rectifying the AC voltage of the power source at a timing different from that of the first half-wave rectifier circuit; The second rectified voltage connected in series with the second LED unit and in parallel with the second LED unit is applied. A seventh energization control unit for controlling the energization amount to the third LED unit in a state in which the second LED unit is in series with the second LED unit and in parallel with the first LED unit A sixth energization control unit for controlling the energization amount to the second LED unit and the third LED unit in a state in which the second rectified voltage is applied, and an output of the second half-wave rectifier circuit To the first LED unit, the second LED unit, and the third LED unit in a state where a second rectified voltage is applied between the first LED unit and the first LED unit in series. A fifth energization control unit for controlling the energization amount, and a fifth energization control unit and a sixth energization control unit based on a current value flowing through the third LED unit in a state where the second rectified voltage is applied; A second current control unit for controlling the seventh energization control unit and the eighth energization control unit. Yes.

  Furthermore, according to the light-emitting diode driving device according to another aspect of the present invention, the first half-wave rectifier circuit is connected to the AC power source and half-wave rectifies the AC voltage of the AC power source to obtain the first rectified voltage. A first LED unit including at least one LED element connected in series with the output side of the first half-wave rectifier circuit, and at least one LED element connected in series with the first LED unit. A second LED part including, a third LED part connected in series with the second LED part, including at least one LED element, and at least one LED element connected in series with the third LED part. Including the fourth LED unit including the second LED unit and connected in series with the first LED unit, the amount of current supplied to the first LED unit is controlled in a state where the first rectified voltage is applied. A first energization control unit to perform the first L A second energization control unit for controlling the energization amount to the first LED unit and the second LED unit in a state where the first rectified voltage is applied, connected in series with the D unit and the second LED unit; The first LED unit, the second LED unit, and the third LED unit are connected in series, and the first rectified voltage is applied to the first LED unit, the second LED unit, and the third LED unit. A state in which a first rectification voltage is applied, which is connected in series with the third energization control unit for controlling the energization amount, and the first LED unit, the second LED unit, the third LED unit, and the fourth LED unit. And a fourth energization control unit for controlling the energization amount to the first LED unit, the second LED unit, the third LED unit, and the fourth LED unit; The first energization control unit, the second energization control unit, the third A first current control unit for controlling the power supply control unit and the fourth current supply control unit and a common AC power supply, and the AC voltage of the AC power supply is half-waved at a timing different from that of the first half-wave rectifier circuit. Second half-wave rectifier circuit for rectifying and obtaining a second rectified voltage, a state in which a second rectified voltage is applied in series with the fourth LED unit and in parallel with the third LED unit An eighth energization control unit for controlling the energization amount to the fourth LED unit, a second rectified voltage connected in series with the third LED unit and in parallel with the second LED unit is applied A seventh energization control unit for controlling the energization amount to the third LED unit and the fourth LED unit, and the second LED unit in series and in parallel with the first LED unit. In addition, the second LED unit, the third LED unit and the second LED unit in a state where the second rectified voltage is applied. A sixth energization control unit for controlling the energization amount to the four LED units, and the first LED unit connected in series between the output side of the second half-wave rectifier circuit and the first LED unit A fifth energization control unit for controlling the energization amount to the first LED unit, the second LED unit, the third LED unit, and the fourth LED unit in a state where the second rectification voltage is applied; In order to control the fifth energization control unit, the sixth energization control unit, the seventh energization control unit, and the eighth energization control unit based on the current value flowing through the fourth LED unit in a state where a voltage is applied. And a second current control unit.

  According to the above configuration, for the first LED unit and the second LED unit connected in series, the circuit for lighting and driving them is operated with the circuit group operated with the first rectified voltage and the second rectified voltage. The two LED groups are prepared, and the lighting time of the first LED part and the second LED part is made uniform by changing the lighting control in each half-wave rectification section of the first rectified voltage and the second rectified voltage. And high-quality light emission with reduced unevenness of light emission can be realized.

1 is a block diagram illustrating a light emitting diode driving device according to Embodiment 1. FIG. 6 is a block diagram showing a light emitting diode driving apparatus according to Embodiment 2. FIG. It is a block diagram which shows the light emitting diode drive device which concerns on Embodiment 3. FIG. It is a block diagram which shows the light emitting diode drive device which concerns on Embodiment 4. FIG. 10 is a block diagram illustrating a light emitting diode driving device according to a fifth embodiment. 1 is a circuit diagram of a light-emitting diode driving apparatus according to Example 1. FIG. It is a block diagram which shows the light emitting diode drive device which this inventor developed previously. 8A is a graph showing the relationship between the power supply voltage and the lighting period of each LED during the lighting drive of the light emitting diode driving device of FIG. 7, and FIG. 8B is the power supply voltage of the light emitting diode driving device according to Example 1 and the lighting of each LED. It is a graph which shows the relationship with a period. 6 is a circuit diagram of a light-emitting diode driving apparatus according to Example 2. FIG. It is a circuit diagram which shows the LED lighting circuit example which uses a microcomputer. It is a timing chart which shows operation | movement of the LED lighting circuit of FIG. It is a block diagram which shows the alternating current drive LED illuminating device suitable for a reverse circulation lighting method.

  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.

  According to one embodiment, in addition to any of the above-described configurations, the first current control unit is configured to apply the first LED in a state where a first rectified voltage is applied from an output side of the first half-wave rectifier circuit. The second LED part is turned on while the first LED part is turned on, and the second LED part is turned off while the first LED part is turned on. The second current control unit turns on the second LED unit in a state where the second rectified voltage is applied from the output side of the second half-wave rectifier circuit, and then turns on the second LED unit while turning on the second LED unit. The first LED portion can be turned on, and the first LED portion can be turned off while the second LED portion is turned on. With the above configuration, the circuit group operated with the first rectified voltage and the circuit group operated with the second rectified voltage are connected to the first LED unit and the second LED unit connected in series, respectively. In the first half-wave section and the second half-wave section that are half-wave rectified from the AC power supply, the first LED section and the second LED section are turned on in reverse order, The lighting time of the second LED unit can be made uniform, and high-quality light emission with reduced light emission unevenness can be realized.

  According to another embodiment, in addition to any one of the configurations described above, the first current detection for detecting the amount of current flowing through the first LED unit, which is further connected in series on the downstream side of the second LED unit. Can be provided.

  Further, in addition to any of the above-described configurations, a second current detector for detecting the amount of current flowing through the second LED unit, which is connected in series on the upstream side of the first LED unit, may be provided. .

  Furthermore, in addition to any one of the configurations described above, a smoothing capacitor connected in parallel to the series connection body of the first LED unit and the second LED unit may be provided.

It can also be set as the fishing light driven with the light emitting diode drive device provided with one of the said structures, and the illumination driven with a light emitting diode drive device.
<Embodiment 1>

  FIG. 1 shows a block diagram of a light-emitting diode driving apparatus 100 according to Embodiment 1 of the present invention. The light-emitting diode driving device 100 shown in this figure includes a first half-wave rectifier circuit 51, a second half-wave rectifier circuit 52, a first LED unit 11, and a second LED unit that are respectively connected to a single-phase AC power supply AP. 12, first energization control unit 21, second energization control unit 22, fifth energization control unit 25, sixth energization control unit 26, first current control unit 31, and second current control unit 32 The first current detector 41 and the second current detector 42 are provided.

  The first half-wave rectifier circuit 51 is connected to a single-phase AC power supply AP, and is a circuit for obtaining a first rectified voltage by half-wave rectifying the AC voltage of the AC power supply AP.

  The second half-wave rectifier circuit 52 is connected to the same AC power supply AP and is a circuit for obtaining a second rectified voltage by half-wave rectifying the AC voltage of the AC power supply AP. The timing at which the second half-wave rectifier circuit 52 half-rectifies the AC voltage is different from the timing at which the first half-wave rectifier circuit 51 performs half-wave rectification, that is, the first half-wave rectifier circuit 51 does not perform half-wave rectification. Timing. As a result, the first rectified voltage and the second rectified voltage have a relationship of positive phase and reverse phase. Here, the first rectified voltage half-wave rectified by the first half-wave rectifier circuit 51 and the second rectified voltage half-wave rectified by the second half-wave rectifier circuit 52 are shifted in phase by 180 °.

  Each of the first LED unit 11 and the second LED unit 12 includes at least one LED element, and one or more LED elements are connected in series. The first LED unit 11 and the second LED unit 12 are connected in series to form the LED assembly 10. A line extending from the first LED unit 11 to the second LED unit 12 is defined as an output line OL.

The output line OL is connected to the output side of the first half-wave rectifier circuit 51 and the output side of the second half-wave rectifier circuit 52, respectively. As viewed from the output line OL side, the first half-wave rectifier circuit 51 and the second half-wave rectifier circuit 52 are in parallel. However, in the example of FIG. 1, the fifth energization control unit 25 and the second current detector 42 are interposed between the output side of the second half-wave rectifier circuit 52 and the first LED unit 11.
(First circuit group 1)

  Further, the LED assembly 10 including the first LED unit 11 and the second LED unit 12 connected to the output line OL is operated with the first rectified voltage half-wave rectified by the first half-wave rectifier circuit 51. One circuit group 1 is connected. Specifically, the first circuit group 1 includes a first energization control unit 21, a second energization control unit 22, a first current control unit 31 that controls them, and a first current detector 41.

  The first energization control unit 21 is connected in series with the first LED unit 11 and in parallel with the second LED unit 12 as viewed from the first LED unit 11. The first energization control unit 21 is a member for controlling the energization amount to the first LED unit 11 in a state where the first rectified voltage is applied, and functions as a first bypass unit.

  The second energization control unit 22 is connected in series with the second LED unit 12 as viewed from the second LED unit 12. The second energization control unit 22 is a member for controlling the energization amount to the first LED unit 11 and the second LED unit 12 in a state where the first rectified voltage is applied, and the second bypass unit or the second It functions as a current limiter.

The first current control unit 31 is a member for controlling the first energization control unit 21 and the second energization control unit 22 based on the current value flowing through the output line OL in a state where the first rectified voltage is applied. It is. In order to detect the current flowing through the output line OL, the first current detector 41 is provided on the output line OL in the example of FIG. Here, the 1st electric current detector 41 is arrange | positioned between the 2nd electricity supply control part 22 and the earthing | grounding end. In other words, the first current detector 41 is connected in series via the second energization control unit 22 on the downstream side of the second LED unit 12. In this configuration, in a state where the first rectified voltage is applied, the second circuit group 2 described later is in an OFF state, so that the current flowing through the output line OL is equal to the current flowing through the first LED unit 11.
(Second circuit group 2)

  Further, the LED assembly 10 connected to the output line OL has a second circuit group operated by the second rectified voltage half-wave rectified by the second half-wave rectifier circuit 52 separately from the first circuit group 1. 2 is connected. Specifically, the second circuit group 2 includes a sixth energization control unit 26, a fifth energization control unit 25, a second current control unit 32 that controls these, and a second current detector 42.

  The sixth energization control unit 26 is connected in series with the second LED unit 12 and in parallel with the first LED unit 11 as viewed from the second LED unit 12. The sixth energization control unit 26 is a member for controlling the energization amount to the second LED unit 12 in a state where the second rectified voltage is applied, and functions as a sixth bypass unit.

  The fifth energization control unit 25 is connected in series with the first LED unit 11 when viewed from the first LED unit 11. In other words, it is connected in series between the output side of the second half-wave rectifier circuit 52 and the first LED unit 11. The fifth energization control unit 25 is a member for controlling the energization amount to the second LED unit 12 and the first LED unit 11 in a state where the second rectified voltage is applied, and the fifth energization control unit 25 Functions as a two-current limiting unit.

  The second current control unit 32 is a member for controlling the sixth energization control unit 26 and the fifth energization control unit 25 based on the current value flowing through the output line OL in a state where the second rectified voltage is applied. It is. In order to detect the current flowing through the output line OL, the second current detector 42 is provided on the output line OL in the example of FIG. Here, the second current detector 42 is disposed between the fifth energization control unit 25 and the output side of the second half-wave rectifier circuit 52. In other words, the second current detector 42 is connected in series via the fifth energization control unit 25 on the upstream side of the first LED unit 11. In this configuration, when the second rectified voltage is applied, the first circuit group 1 is in the OFF state, so that the current flowing through the output line OL is equal to the current flowing through the second LED unit 12.

  The light emitting diode driving device 100 described above is operated at the first rectified voltage as a circuit for lighting and driving the LED assembly 10 having the first LED unit 11 and the second LED unit 12 connected in series. Two circuits are prepared: a first circuit group 1 and a second circuit group 2 operated by a second rectified voltage. In the example of FIG. 1, the first circuit group 1 and the second circuit group 2 both include the LED assembly 10, and the first circuit group 1 is configured on the left side of the LED assembly 10. Members such as the energization control unit 21 are arranged, and a sixth energization control unit 26 constituting the second circuit group 2 is arranged on the right side. Then, the LED assembly 10 is configured by changing the lighting control in each half-wave rectification section of the first rectified voltage for driving the first circuit group 1 and the second rectified voltage for driving the second circuit group 2. The lighting time of the 1st LED part 11 and the 2nd LED part 12 to perform can be equalize | homogenized, and high quality light emission which reduced the light emission nonuniformity is realizable. Specifically, the first half-wave rectifier circuit 51 connected to the single-phase AC power supply AP obtains a first rectified voltage obtained by rectifying the AC voltage. When this rectified voltage rises to a voltage at which the first LED unit 11 can be lit, the first current control unit 31 lights the first LED unit 11 with a preset appropriate drive current, and then the first rectified voltage further increases. When the first LED unit and the second LED unit rise to a voltage that can be turned on, the voltage between the terminals of the first energization control unit exceeds Vf of the second LED unit (the first energization control unit is shut off). When the second LED unit 12 is lit with an appropriate drive current while the one LED unit 11 is lit, the first rectified voltage exceeds the peak and falls below the voltage at which both the first and second LED units can be lit. The second LED unit 12 is turned off while the first LED unit 11 is lit, and the first LED unit 11 is turned on so that the first LED unit 11 is turned off when the first rectified voltage drops and falls below a voltage that can be turned on.

Next, the second half-wave rectifier circuit 52 obtains a second rectified voltage obtained by rectifying a waveform having an opposite phase to that of the first half-wave rectifier circuit 51 in the AC voltage. When the rectified voltage rises to a voltage at which the second LED unit 12 can be turned on, the second current control unit 32 turns on the second LED unit 12 with an appropriate driving current set in advance. Next, when the second rectified voltage further rises to a voltage at which both the first LED unit and the second LED unit can be lit, the voltage between the terminals of the sixth energization control unit exceeds Vf of the first LED unit (the sixth energization control unit is The first LED unit 11 is lit with an appropriate drive current while the second LED unit 12 is lit, and the second rectified voltage exceeds the peak, and the first and second LED units can be lit together. If the value is less than, the first LED unit 11 is turned off while the second LED unit 12 is lit, and the second rectified voltage is further lowered. Thus, in the first half-wave rectification section and the second half-wave rectification section that are half-wave rectified from the common AC power supply AP, the order in which the first LED section 11 and the second LED section 12 are lit is reversed. By doing so, the lighting time of the first LED unit 11 and the second LED unit 12 can be made uniform, and high-quality light emission with reduced unevenness in light emission can be realized.
(First energization control unit 21)

  Hereinafter, each member will be described in detail. A first energization control unit 21 for controlling the energization amount to the first LED unit 11 is connected in parallel with the second LED unit 12. The first energization control unit 21 has one end connected in series with the downstream side of the first LED unit 11 and the other end connected to the upstream side of the first current detector 41, and energization to the first LED unit 11. Configure a bypass path to adjust the amount. That is, since the amount of current bypassed by the first energization control unit 21 can be adjusted, the energization amount of the first LED unit 11 can be controlled as a result. In the example of FIG. 1, a first energization control unit 21 is connected in parallel with the second LED unit 12 to form a first bypass path BP1. In addition, the parallel connection here does not require that both ends of each LED unit and each energization control unit are connected, and one end of each energization control unit is connected to one end of each LED unit, and the current flows. It is sufficient if it is configured to be branched. For example, in the example of FIG. 1, the first energization control unit 21 has one end connected to the upstream side of the second LED unit 12 and the other end connected to the upstream side of the first current detector 41 on the output line OL. ing. As described above, the parallel connection of the energization control units is used to indicate a connection form in which the current of each LED unit connected on the output line OL is branched.

  The 1st electricity supply control part 21 can be comprised by the bypass part which bypasses the electric current which flows through the 1st LED part 11, for example, and the current control part which controls operation | movement of this bypass part. Here, the energization control unit is a member for controlling a current circuit that performs current driving of the LED unit. For example, a kind of constant current circuit is configured by the first energization control unit 21 and the first current control unit 31 that controls the operation of the first energization control unit 21, that is, the operation such as ON / OFF and continuously variable current amount. Is done. The constant current circuit is controlled by monitoring the amount of current of the LED assembly 10 using, for example, a first current detector 41 connected to the output line OL, and the first current control unit 31 is bypassed based on this value. Switch the control amount. The first energization control unit may be configured as a first energization control unit in addition to the bypass unit and the current control unit. Such a first energization control unit can be composed of a semiconductor drive element such as a transistor.

Similarly, a sixth energization control unit 26 for controlling the energization amount to the sixth LED unit 16 constituting the second circuit group 2 is connected in parallel with the first LED unit 11. The sixth energization control unit 26 has one end connected in series with the upstream side of the second LED unit 12 and the other end connected to the downstream side of the second current detector 42, and is bypassed by the sixth energization control unit 26. The bypass path which adjusts the energization amount to the 2nd LED part 12 by adjusting the amount of currents to be constituted is constituted. In the example of FIG. 1, a sixth energization control unit 26 is connected in parallel with the first LED unit 11 to form a sixth bypass path BP8. The sixth energization control unit 26 and the second current control unit 32 that controls the operation of the sixth energization control unit 26 constitute a kind of constant current circuit. The constant current circuit is controlled by monitoring the amount of current in the LED assembly 10 using, for example, the second current detector 42 connected to the output line OL, and the second current control unit 32 is based on this value. Switch the control amount. Specifically, the first LED unit and the sixth energization control unit arranged in parallel with the first LED unit, or the second LED and the first energization control unit arranged in parallel with the second LED, respectively, The same operation is performed when the rectifier circuit operates. In the constant current operation (or controlled to a sine wave), the energization control unit consumes the difference voltage between the LED Vf and the power supply voltage in series with the energization control unit (terminal voltage of the energization control unit). When the voltage rises and this consumption voltage exceeds Vf of the parallel LEDs, a current automatically flows to the LED side, and control is transferred to another energization control unit arranged in series with this LED. For this reason, the timing of switching is always appropriately performed, and the power supply efficiency is kept at the best.
(LED assembly 10)

  On the other hand, each LED part constituting the LED assembly 10 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.

The first forward voltage Vf ₁ that is an added value of the forward voltages of the LED elements included in the first LED unit 11 is determined by the number of LED elements connected in series. The second forward voltage Vf ₂ for lighting both the first LED unit 11 and the second LED unit 12 is further connected in series to the first forward voltage Vf ₁ and included in the second LED unit 12. A value obtained by adding a forward voltage of the LED element.
(First current detector 41)

In the light emitting diode driving device 100, the second rectified voltage is applied based on the current value detected by the first current detector 41 in the first half-wave rectified section where the first rectified voltage is applied. In the half-wave rectification section, the energization amount for each LED unit is controlled based on the current value detected by the second current detector 42. 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. For the detection of this current value, the first current detector 41 and the second current detector 42 are used. A resistor or the like can be suitably used for the first current detector 41 or the like. In the example of FIG. 1, the first current detector 41 is connected to the downstream side of the second energization control unit 22, but the first current detector is not limited to this position, and is located at other positions on the output line. It may be provided. For example, a second current detector and a first current detector described later may be shared.
<Embodiment 2>

  In the example of FIG. 1, two LED units are used, and the first LED unit 11 and the second LED unit 12 are connected in series to constitute the LED assembly 10. However, the present invention does not limit the number of LED portions to two, and for example, the number of LED portions can be three or more. As an example, FIG. 2 shows an example in which the LED assembly is configured by three of a first LED unit 11, a second LED unit 12, and a third LED unit 13 as a second embodiment. The LED driving device 200 shown in this figure includes a first half-wave rectifier circuit 51, a second half-wave rectifier circuit 52, a first LED unit 11, a second LED unit 12, a third LED unit 13, and a first LED. One energization control unit 21, a second energization control unit 22, a third energization control unit 23, a fifth energization control unit 25, a sixth energization control unit 26, a seventh energization control unit 27, and a first current A detector 41 and a second current detector 42 are provided. In addition, about the member same as FIG. 1, the same name is attached | subjected and detailed description is abbreviate | omitted.

  Similar to the first LED unit 11 and the second LED unit 12, the third LED unit 13 includes at least one LED element. Further, the third LED unit 13 is connected in series with the first LED unit 11 and the second LED unit 12 and constitutes the LED assembly 10. Furthermore, a line extending from the first LED unit 11 to the second LED unit 12 and the third LED unit 13 becomes an output line OL.

  The first circuit group 1 includes a third energization control unit 23 in addition to the first current detector 41, the first energization control unit 21, and the second energization control unit 22. The first current control unit 31 controls the first energization control unit 21, the second energization control unit 22, and the third energization control unit 23. The second energization control unit 22 forms a second bypass path BP2 and controls the energization amount to the first LED unit 11 and the second LED unit 12 in a state where the first rectified voltage is applied.

  The third energization control unit 23 is connected in series with the third LED unit 13 as viewed from the third LED unit 13. The third energization control unit 23 is a member for controlling the energization amount to the first LED unit 11, the second LED unit 12, and the third LED unit 13 in a state where the first rectified voltage is applied, Functions as three bypass parts or first current limiting part. In addition, the first current control unit 31 is based on the current value flowing through the output line OL, that is, the current value flowing through the first LED unit 11 in this case, in a state where the first rectified voltage is applied. The second energization control unit 22 and the third energization control unit 23 are controlled. The current flowing through the first LED unit 11 is detected by the first current detector 41.

  The second circuit group 2 includes a seventh energization control unit 27, a sixth energization control unit 26, a fifth energization control unit 25, a second current control unit 32 that controls these, and a second current detector 42. The second current control unit 32 controls the seventh energization control unit 27, the sixth energization control unit 26, and the fifth energization control unit 25.

  The seventh energization control unit 27 is connected in series with the third LED unit 13 as viewed from the third LED unit 13. The seventh energization control unit 27 is connected in parallel with the second LED unit 12. The seventh energization control unit 27 is a member for controlling the energization amount to the third LED unit 13 in a state where the second rectified voltage is applied, and functions as a seventh bypass unit. The second current control unit 32 also applies the seventh energization control unit 27 based on the current value flowing through the output line OL, that is, the current value flowing through the third LED unit 13 in this case, in a state where the second rectified voltage is applied. The sixth energization control unit 26 and the fifth energization control unit 25 are controlled. The second current control unit 32 is set to the current value flowing through the output line OL, that is, the current value flowing through the third LED unit 13 and the second current control unit 32 in the state where the second rectified voltage is applied. Based on the comparison of the reference current values, the second current detector 42 detects the current flowing through the third LED unit 13.

  As a result, for the first LED unit 11 to the third LED unit 13 connected in series, a circuit for lighting and driving them is connected to the first circuit group 1 and the first half-wave rectifier circuit 51 side. By preparing two of the second circuit group 2 that is connected to the two half-wave rectifier circuit 52 side, and by controlling the lighting to be different in each half-wave rectification section of the first rectified voltage and the second rectified voltage, The lighting time of the LED unit 11 to the third LED unit 13 can be made uniform, and high-quality light emission with reduced unevenness in light emission can be realized.

The present embodiment is a subordinate concept of the first embodiment, but has been described as another embodiment in order to facilitate understanding of the invention.
<Embodiment 3>

  Furthermore, as Embodiment 3, as the LED aggregate, a light emitting diode driving device 300 configured by connecting four of the first LED unit 11, the second LED unit 12, the third LED unit 13, and the fourth LED unit 14 in series. Is shown in FIG. The LED driving device 300 shown in this figure includes a first half-wave rectifier circuit 51, a second half-wave rectifier circuit 52, a first LED unit 11, a second LED unit 12, a third LED unit 13, and a fourth LED unit. 14, first energization control unit 21, second energization control unit 22, third energization control unit 23, fourth energization control unit 24, fifth energization control unit 25, sixth energization control unit 26, and seventh energization control. Unit 27, eighth energization control unit 28, first current detector 41, and second current detector 42. In addition, about the member same as FIG.1 and FIG.2, the same name is attached | subjected and detailed description is abbreviate | omitted.

  The fourth LED unit 14 includes at least one LED element, similarly to the first LED unit 11 to the third LED unit 13. The fourth LED unit 14 is connected in series with the first LED unit 11 to the third LED unit 13 and constitutes the LED assembly 10. A line extending from the first LED unit 11 to the fourth LED unit 14 is an output line OL.

  The first circuit group 1 includes a fourth energization control unit 24 in addition to the first current detector 41, the first energization control unit 21, the second energization control unit 22, and the third energization control unit 23. The first current control unit 31 controls the first energization control unit 21, the second energization control unit 22, the third energization control unit 23, and the fourth energization control unit 24. The third energization control unit 23 forms the third bypass path BP3 and controls the energization amount to the first LED unit 11, the second LED unit 12, and the third LED unit 13 in a state where the first rectified voltage is applied. To do.

  The fourth energization control unit 24 is connected in series with the fourth LED unit 14 as viewed from the fourth LED unit 14. The fourth energization control unit 24 controls the energization amount to the first LED unit 11, the second LED unit 12, the third LED unit 13, and the fourth LED unit 14 in a state where the first rectified voltage is applied. And functions as a fourth bypass section or a first current limiting section. In addition, the first current control unit 31 is based on the current value flowing through the output line OL, that is, the current value flowing through the first LED unit 11 in this case, in a state where the first rectified voltage is applied. The second energization control unit 22, the third energization control unit 23, and the fourth energization control unit 24 are controlled. The current flowing through the first LED unit 11 is detected by the first current detector 41.

  The second circuit group 2 includes an eighth energization control unit 28, a seventh energization control unit 27, a sixth energization control unit 26, a fifth energization control unit 25, a second current control unit 32 that controls these, and a second A current detector 42 is provided. The second current control unit 32 controls the eighth energization control unit 28, the seventh energization control unit 27, the sixth energization control unit 26, and the fifth energization control unit 25.

  The eighth energization control unit 28 is connected in series with the fourth LED unit 14 as viewed from the fourth LED unit 14. The eighth energization control unit 28 is connected in parallel with the third LED unit 13. The eighth energization control unit 28 is a member for controlling the energization amount to the fourth LED unit 14 in a state where the second rectified voltage is applied, and functions as an eighth bypass unit. The second current control unit 32 also applies the eighth energization control unit 28 based on the current value flowing through the output line OL, that is, the current value flowing through the fourth LED unit 14 in this case, in a state where the second rectified voltage is applied. The seventh energization control unit 27, the sixth energization control unit 26, and the fifth energization control unit 25 are controlled. The second current control unit 32 is set to the current value flowing through the output line OL, that is, the current value flowing through the fourth LED unit 14 and the second current control unit 32 in a state where the second rectified voltage is applied. Based on the comparison of the reference current values, the second current detector 42 detects the current flowing through the fourth LED unit 14.

  Thereby, for the first LED unit 11 to the fourth LED unit 14 connected in series, a circuit for lighting and driving them is connected to the first circuit group 1 and the first half-wave rectifier circuit 51 side. By preparing two of the second circuit group 2 that is connected to the two half-wave rectifier circuit 52 side, and by controlling the lighting to be different in each half-wave rectification section of the first rectified voltage and the second rectified voltage, The lighting time of the LED unit 11 to the fourth LED unit 14 can be made uniform, and high-quality light emission with reduced light emission unevenness can be realized. That is, the first half-wave rectifier circuit 51 and the second half-wave rectifier circuit 52 respectively rectify the AC power supply AP by half-wave, and supply power to the LED assembly 10 at half-cycle alternation of the AC power supply AP. Thereby, in the half cycle in which one of the first half-wave rectifier circuits 51 is operating, the second half-wave rectifier circuit 52 does not perform rectification, and in the next half cycle, the first half-wave rectifier circuit 51 is stopped, The half-wave rectifier circuit 52 operates. For this reason, during the operation of the first half-wave rectifier circuit 51, the first rectified voltage is thereby supplied, the first circuit group 1 provided on the left side of the LED assembly 10 operates, and the LED assembly 10 is powered. Supply and drive. Then, in the next half cycle, the second half-wave rectifier circuit 52 operates by supplying the second rectified voltage to the second circuit group 2 provided on the right side of the LED assembly 10, and the lighting order reverse to the first half cycle. Thus, power is supplied to the LED assembly 10. By operating in this way, conventionally, the power supplied to the fourth LED unit 14 that has the smallest total power supply and the first LED unit 11 that has the largest total power supply becomes substantially equal. Similarly, the total power supplied to the second LED unit 12 and the third LED unit 13 becomes equal. As a result, the luminous intensity of each LED unit is made uniform.

The present embodiment is a subordinate concept of the first and second embodiments, but has been described as another embodiment in order to facilitate understanding of the invention.
<Embodiment 4>

The light emitting diode driving device can further include a harmonic suppression signal generating unit and a current control signal applying unit. As an example, FIG. 4 shows an embodiment 4 in which a harmonic suppression signal generation unit and a current control signal applying unit are added to the light emitting diode driving device of FIG. In the light emitting diode driving device 400, the first harmonic suppression signal generation unit 61 and the first current control signal applying unit 71 are provided on the first circuit group 1 side, and the second harmonic suppression signal generation unit is provided on the second circuit group 2 side. 62 and a second current control signal applying unit 72 are provided. The first harmonic suppression signal generator 61 is a member that is connected to the output side of the first half-wave rectifier circuit 51, generates a sine wave of a predetermined magnitude, and supplies it to the first current controller 31. . The second harmonic suppression signal generator 62 is connected to the output side of the second half-wave rectifier circuit 52, and is a member for generating a sine wave of a predetermined magnitude and supplying it to the second current controller 32. is there.
(First harmonic suppression signal generator 61)

  The first harmonic suppression signal generation unit 61 is connected to the first current control unit 31. The first harmonic suppression signal generator 61 generates a first harmonic suppression signal voltage based on the first rectified voltage output from the first half-wave rectifier circuit 51. Here, in a state where the first rectified voltage is applied, the first harmonic suppression signal generation unit 61 compresses the first rectified voltage rectified by the first half-wave rectifier circuit 51 to an appropriate magnitude, One current is sent to the current control unit 31. The first current control unit 31 uses the signal sent from the first harmonic suppression signal generation unit 61 as a reference signal and compares it with the first current detection signal detected by the first current detector 41. The first current control unit 31 drives each LED unit at an appropriate timing and current via the first energization control unit 21 to the fourth energization control unit 24 based on the comparison result.

Similarly, the second harmonic suppression signal generation unit 62 is connected to the second current control unit 32. The second harmonic suppression signal generator 62 generates a second harmonic suppression signal voltage based on the second rectified voltage output from the second half-wave rectifier circuit 52. Here, in a state where the second rectified voltage is applied, the second harmonic suppression signal generation unit 62 compresses the second rectified voltage rectified by the second half-wave rectifier circuit 52 to an appropriate magnitude, This is sent to the dual current control unit 32. The second current control unit 32 uses the signal sent from the second harmonic suppression signal generation unit 62 as a reference signal and compares it with the second current detection signal detected by the second current detector 42. Based on the comparison result, the second current control unit 32 drives each LED unit at an appropriate timing and current via each of the fifth energization control unit 25 to the eighth energization control unit 28.
(First current control signal applying unit 71)

Further, a first current control signal applying unit 71 is interposed between the first current control unit 31 and the first energization control unit 21 to the fourth energization control unit 24. For example, since a potential difference occurs between the operation control signal applied to the first energization control unit 21 and the operation control signal applied to the fourth energization control unit 24, the first energization control is provided by providing the first current control signal applying unit 71. It becomes possible to reliably switch the operation of the unit 21 and the fourth energization control unit 24. Similarly, a second current control signal applying unit 72 is interposed between the second current control unit 32 and the fifth energization control unit 25 to the eighth energization control unit 28.
<Embodiment 5>

The light emitting diode driving device may further include a smoothing circuit. As an example, FIG. 5 shows a fifth embodiment in which a smoothing circuit is added to the light-emitting diode driving device of FIG. The light emitting diode driving device 500 shown in this figure includes a smoothing circuit connected in parallel with the LED assembly 10. The smoothing circuit is a member for reducing the turn-off period of the LED assembly 10. This smoothing circuit is constituted by a smoothing capacitor 80, for example.
(Charging the smoothing capacitor 80)

The voltage between the terminals of the smoothing capacitor 80 becomes equal to the sum Vf _all of forward voltages of all LEDs of the first LED unit 11 to the fourth LED unit 14 in a steady operation state. Therefore, when the input voltage reaches the voltage at which the first LED unit 11 to the fourth LED unit 14 are driven, charging is started, and the input voltage is changed from the first LED unit 11 to the fourth LED unit 14 by the current control unit 30. When the voltage drops to a voltage that cannot be driven with the instructed current value (transition to a state in which the first LED unit 11 to the third LED unit 13 are driven), the charging is finished. During the charging period, since the capacitor terminal voltage increases Vf _all also rises by charging, LED drive current is increased, the charging current to the smoothing capacitor 80 gradually decreases. The capacitor charging current and the LED driving current are combined and controlled by the current control unit 30 to a sine wave current. As a result, the smoothing capacitor 80 can be charged without affecting the current of the entire light emitting diode driving device that is controlled by a current waveform that approximates a sine wave.
(Discharge from the smoothing capacitor 80)

On the other hand, the smoothing capacitor 80 discharges the charges accumulated here to the connected first LED unit 11 to fourth LED unit 14. Since the charging voltage of the smoothing capacitor 80 is the sum Vf _1-4 of the forward voltages of the first LED unit 11 to the fourth LED unit 14 connected in series constituting the LED assembly 10, the LED assembly is charged when the capacitor is charged. The smoothing capacitor 80 is not discharged by a current greater than the current flowing through the body 10.

In addition, it cannot be overemphasized that the element added in each embodiment mentioned above is applicable similarly in other embodiment, for example, Embodiment 1 and 2. FIG.
<Example 1>

  Next, a specific circuit configuration example in which the light-emitting diode driving device 400 of FIG. 4 is realized by using a semiconductor element is shown in FIG. The light emitting diode driving device 600 uses diodes as the first half-wave rectifier circuit 51 and the second half-wave rectifier circuit 52 connected to the AC power supply AP. In the first half-wave rectifier circuit 51 and the second half-wave rectifier circuit 52, the rectification directions of the diodes are opposite to each other.

A protective member 81 is connected in series to the AC power supply AP. As the protective member, a fuse for preventing overcurrent can be suitably used. The AC power supply AP may be provided with a surge protection circuit. Further, a bypass capacitor 82 is connected in parallel with the AC power supply AP.
(AC power supply AP)

As the AC power supply AP, a commercial power supply of 100V or 200V can be suitably used. 100V or 200V of this commercial power supply is an effective value, and the maximum voltage of the rectified waveform obtained by full-wave rectification is about 141V or 282V.
(LED assembly 10)

  The LED units constituting the LED assembly 10 are connected in series with each other, divided into a plurality of blocks, and a terminal is drawn out from the boundary between the blocks, and the first energization control unit 21 and the second energization control unit 22. The third energization control unit 23 and the fourth energization control unit 24 are connected. In the example of FIG. 6, the LED assembly 10 is configured by four groups of the first LED unit 11, the second LED unit 12, the third LED unit 13, and the fourth LED unit 14.

Each LED part 11-14 shown in FIG. 6 represents the LED package in which one LED symbol mounted the some LED chip. In this example, each LED package has 10 LED chips mounted thereon. The number of light emitting diodes connected to each LED unit or the number of LED units connected is determined by the added value of forward voltages, that is, the total number of LED elements connected in series and the power supply voltage to be used. For example, when commercial power is used, the total forward voltage Vf _all is the sum of the Vf of each LED unit is about 141V, or is set as follows becomes.

In the example of FIG. 6, the four LED portions are designed to have the same Vf. However, the present invention is not limited to this example, and as described above, the number of LED units may be 3 or less, or 5 or more. By increasing the number of LED units, it is possible to increase the number of current controls and perform more detailed lighting switching control between the LED units. Furthermore, the Vf of each LED part does not need to be the same.
(First Energization Control Unit 21 to Fourth Energization Control Unit 24)

  The 1st electricity supply control part 21, the 2nd electricity supply control part 22, the 3rd electricity supply control part 23, and the 4th electricity supply control part 24 are members for carrying out an electric current corresponding to each LED part. Such first energization control unit 21 to fourth energization control unit 24 are configured by semiconductor elements such as transistors. In particular, the FET is preferable in terms of efficiency because the gate is driven by voltage. However, it goes without saying that the first energization control unit 21 to the fourth energization control unit 24 are not limited to FETs, and can be configured by bipolar transistors or the like.

  In the example of FIG. 6, LED current control transistors are used as the first energization control unit 21 to the fourth energization control unit 24. Specifically, the first LED unit 11, the second LED unit 12, the third LED unit 13, and the fourth LED unit 14 are respectively a first energization control unit 21 to a fourth energization control unit 24 on the downstream side. The first energization control transistor 21B, the second energization control transistor 22B, the third energization control transistor 23B, and the fourth energization control transistor 24B are connected. Each energization control transistor is switched between ON state and current control according to the amount of current in the LED section in the preceding stage. When the energization control transistor is turned off, no current flows through the bypass path, and the LED unit is energized. That is, since the amount of current bypassed by each of the first energization control unit 21 to the fourth energization control unit 24 can be adjusted, the energization amount of each LED unit can be controlled as a result. In the example of FIG. 6, the first energization control unit 21 is connected in parallel with the second LED unit 12 to form the first bypass path BP1. A second energization control unit 22 is connected in parallel with the third LED unit 13 to form a second bypass path BP2. Further, a third energization control unit 23 is connected in parallel with the fourth LED unit 14 to form a third bypass path BP3. Furthermore, the fourth energization control transistor 24B is connected in series with the fourth LED unit 14 to form a fourth bypass path BP4, and the first LED unit 11, the second LED unit 12, the third LED unit 13, and the fourth LED. The amount of energization to the unit 14 is controlled.

In addition, the 1st LED part 11 does not provide the bypass path | route and electricity supply control part which were connected in parallel. This is because the first energization control unit 21 connected in parallel with the second LED unit 12 controls the current amount of the first LED unit 11. For the fourth LED unit 14, the fourth energization control transistor 24B performs current control.
(First current control unit 31)

  The first current control unit 31 is a member that controls the first energization control unit 21 to the fourth energization control unit 24 corresponding to each LED unit to perform current drive at an appropriate timing. The first current control unit 31 outputs an operation control signal for controlling the operation of the energization control unit using the first rectified voltage rectified by the first half-wave rectifier circuit 51 as a reference voltage. Thereby, the amount of current on the output line OL detected by the first current detector 41 can be controlled to a value proportional to the rectified voltage. As a result, the input current of the entire circuit becomes a waveform proportional to the AC input voltage, and harmonics can be suppressed.

  A switching element such as a transistor can also be used for the first current control unit 31 of FIG. In particular, the bipolar transistor can be suitably used for detecting the amount of current. However, in this example, the first current control unit 31 is composed of an operational amplifier 31B. Needless to say, the first current control unit is not limited to the operational amplifier, and can be configured by a comparator, a bipolar transistor, a MOSFET, or the like.

In the example of FIG. 6, the first current control unit 31 controls the operations of the energization control transistors 21 </ b> B to 24 </ b> B. That is, each current detection operational amplifier controls the energization amount to switch the energization control transistor to OFF / current control / ON.
(First current detector 41)

The first current detector 41 is a member for detecting a current supplied to the LED assembly 10 in which the LED units are connected in series by a voltage drop or the like. By performing current detection with the first current detector 41, current driving of each LED unit constituting the LED assembly 10 is performed. The first current detector 41 also functions as a protective resistor for the LED. Further, in order to drive the current based on the current detection signal detected by the first current detector 41, the first current detector 41 is connected to an operational amplifier 31B which is a first current control unit 31 that controls the current circuit. ing. In this circuit example, the first energization control unit 21, the second energization control unit 22, the third energization control unit 23, the fourth energization control unit 24, and the first current control unit 31 constitute a kind of constant current circuit. .
(First current control signal applying unit 71)

  Further, a first current control signal applying unit 71 is interposed between the first current control unit 31 and each energization control unit. For example, since a potential difference occurs between the operation control signal applied to the first energization control unit 21 and the operation control signal applied to the fourth energization control unit 24, the first energization control is provided by providing the first current control signal applying unit 71. It becomes possible to reliably switch the operation of the unit 21 and the fourth energization control unit 24. Each first current control signal applying unit 71 defines at which current timing each energization control transistor is turned on / off. Here, as the input voltage increases, the current control signal applying Zener diodes 71a, 71b, and 71c are used as the first current control signal applying units 71 so that the first to fourth energization control transistors 21B to 24B are turned off in this order. Is set and arranged. In the example of FIG. 6, the first current control signal applying unit 71 is configured by a Zener diode, but may be a resistor, a diode, or the like.

In the circuit example of FIG. 6, as the input voltage rectified by the first half-wave rectifier circuit 51 increases, the first LED unit 11 to the second LED unit 12, the third LED unit 13, and the fourth LED unit 14. In sequence, the energization amount can be controlled. When the input voltage decreases, the LEDs are turned off in the reverse order.
(First harmonic suppression signal generating resistors 61a and 61b)

On the other hand, in the circuit example of FIG. 6, the first current control unit 31 is configured by an operational amplifier 31 </ b> B, and the operational amplifier 31 </ b> B is controlled by the first harmonic suppression signal generation unit 61. The first harmonic suppression signal generation unit 61 includes first harmonic suppression signal generation resistors 61a and 61b. The first harmonic suppression signal generation resistors 61 a and 61 b divide the rectified voltage rectified by the first half-wave rectifier circuit 51. In other words, the rectified voltage is compressed to an appropriate level. A harmonic suppression signal that is a compressed sine wave and is output from the first harmonic suppression signal generation resistors 61a and 61b is input to the + side input terminal of the operational amplifier 31B that is the first current control unit.
(Constant voltage power supply 31B0)

  The operational amplifier 31B is driven by a constant voltage power supply 31B0. The constant voltage power supply 31B0 includes an operational amplifier power supply transistor 31B1, a Zener diode 31B2, and a Zener voltage setting resistor 31B3. The constant voltage power supply 31B0 supplies power to the operational amplifier 31B only during a period in which the rectified voltage after the AC power supply AP is rectified by the first half-wave rectifier circuit 51 exceeds the Zener voltage of the Zener diode 31B2. This period is set to include the lighting period of the LED assembly 10. In other words, the operational amplifier 31B is operated during the lighting of the LED assembly 10 to control the lighting.

  On the other hand, a voltage that is a current detection signal detected by the first current detection resistor 41 is input to the negative input terminal of the operational amplifier 31B. The voltage of the first current detection resistor 41 is controlled so that the current is controlled along a sine wave applied to the + side input terminal of the operational amplifier 31B. Thus, since the current control operation is performed along the sine wave, the LED drive current has a waveform approximated to a sine wave.

  The operation of the first circuit group 1 has been described above, but the same applies to the second circuit group 2. That is, in the second half-wave rectification period to which the second rectified voltage is applied, the fifth energization control transistor 25B to the eighth energization control transistor 28B constituting the fifth energization control unit 25 to the eighth energization control unit 28 provide the fourth The LED unit 14, the third LED unit 13, the second LED unit 12, and the first LED unit 11 are controlled to be lit in this order. Further, the fifth energization control transistor 25B to the eighth energization control transistor 28B are output lines OL detected by the second current detector 42 constituting the second current detection resistor 42B by the operational amplifier 32B constituting the second current control unit. Is driven through current control signal applying Zener diodes 72a, 72b, 72c constituting the second current control signal applying unit 72, based on the amount of current supplied, here the amount of current of the fourth LED unit 14. A voltage that is a current detection signal detected by the second current detection resistor 42 is input to the negative input terminal of the operational amplifier 32B. The voltage of the second current detection resistor 42 is controlled so that the current is controlled along a sine wave applied to the negative input terminal of the operational amplifier 32B. For this reason, the second harmonic suppression signal generation resistors 62a and 62 constituting the second harmonic suppression signal generation unit 62 are connected to the negative side input terminal of the operational amplifier 32B, and the second rectified voltage rectified by half-wave is divided. Pressed and input. Further, the constant voltage power source 32B0 that constitutes the power source of the operational amplifier 32B is the same as the first circuit group 1 in that it is composed of an operational amplifier power source transistor 32B1, a Zener diode 32B2, and a Zener voltage setting resistor 32B3.

  Each LED section can be configured by connecting a plurality of light emitting diode elements in series with each other. As a result, the rectified voltage can be effectively divided by a plurality of light emitting diode elements, and variations in forward voltage Vf and temperature characteristics for each light emitting diode element can be absorbed to some extent, and control in units of blocks can be made uniform. However, the number of LED units and the number of light emitting diode elements constituting each LED unit can be arbitrarily set according to required brightness, input voltage, etc., for example, the LED unit can be configured with one light emitting diode element, It goes without saying that finer control can be performed by increasing the number of LEDs, or conversely, the control can be simplified by using only two LED units.

  In the above configuration, the number of LED units is four, but it goes without saying that the number of LED units can be two or three, or five or more. In particular, by increasing the number of LED portions, a sinusoidal current waveform can be formed from a lower power supply voltage, and harmonic components can be further suppressed. In the example of FIG. 6, the switching operation in which each LED unit is turned ON / OFF is divided almost evenly with respect to the input current. Also good.

Further, in the above example, the LEDs are divided into four LED portions, and each LED portion is configured to have the same Vf. However, the LEDs may not be the same Vf. For example, if the Vf of the LED unit 1 can be set as low as possible, that is, about 3.0 V for one LED, the current rise timing can be advanced and the fall timing can be delayed. This is further advantageous for reducing harmonics. If this method is used, the number of LED units and the Vf setting can be freely selected, and the current waveform can be approximated to a sine wave. Therefore, it is easy to increase the flexibility and suppress harmonics.
(Lighting pattern)

  Here, for comparison, the LED lighting pattern of the light emitting diode driving device 900 shown in FIG. 7 previously developed by the present inventor and the LED lighting pattern of the light emitting diode driving device 600 according to Example 1 are shown in FIGS. 8A and 8B. Respectively. As shown in these figures, the current control unit 20 performs full-wave rectification of the AC voltage using the rectifier circuit 50 of FIG. 7 and based on the energization amount of the output line OL detected by the current detector 40. When the first LED assembly 10 (the first LED unit 11 to the fourth LED unit 14) connected in multiple stages is driven to be lit, the lighting time of the LED unit that is driven in a low rectified voltage region as shown in FIG. 8A. There is a tendency that the lighting time of the LED unit driven in a long and high region is shortened. When the lighting times of the LED units are different, the light intensity is also different. This is because each LED unit starts lighting in order as it gradually increases from the time when the AC power supply voltage is low, and after it reaches the maximum voltage, it turns off in the reverse order of the lighting order as it gradually decreases. It is. For this reason, it is inevitable that variations occur in the lighting period of the LED section. As a result, there has been a problem that flickering occurs or the amount of heat generated varies depending on the lighting time of the LED unit, so that a mechanism for uniformly radiating heat is required.

  On the other hand, in the light emitting diode driving device 600 according to the first embodiment, the LEDs are turned on by configuring the circuit so as to reverse the order in which the LEDs are turned on with each rectified voltage by half-wave rectification. The time is made uniform as a whole. Specifically, in a certain half cycle of the frequency cycle of the AC power supply AP, lighting starts in the order of the first LED unit 11 → the second LED unit 12 → the third LED unit 13 → the fourth LED unit 14, and The lights are turned off in the order of the four LED parts 14 → the third LED part 13 → the second LED part 12 → the first LED part 11. In the next half cycle, lighting starts in the order of the fourth LED unit 14 → the third LED unit 13 → the second LED unit 12 → the first LED unit 11, and the first LED unit 11 → the second LED unit 12 → the third. The LED unit 13 is turned off in the order of the fourth LED unit 14. By configuring the drive device in this way, it is possible to suppress the light intensity difference between the LED units. As a result, the lighting time of each LED unit is made almost constant to suppress flickering, and the amount of heat generation is made uniform, so the heat dissipation mechanism can be the same mechanism in each LED unit, and the configuration is simplified Is planned. Moreover, lighting control can also be simplified by preparing the circuit which drives an LED part separately in each period of a 1st rectification voltage and a 2nd rectification voltage. In other words, by using a common drive circuit and not performing complicated switching that reverses the direction of current flow, the circuit configuration and control can be simplified, and an inexpensive and highly reliable LED drive device can be realized. .

In addition, the inventor conducted a comparative test to make the Vf of each LED portion equal, and set each to about 30 V (× 4 stages) in FIGS. 3 and 7. In the LED driving device 900 of FIG. When the power difference between the first LED unit 11 and the fourth LED unit 14 is 40% or more in the similar current waveform driving, the power of the first LED unit 11 and the second LED unit 12 in the light emitting diode driving device 300 of FIG. The difference could be 15%. Thereby, when mounting the LED, it is possible to eliminate the need to consider the arrangement of the LED elements of each LED unit in consideration of the light / dark difference depending on the mounting location. Further, due to the power difference between the LED units, an excessive power load is not applied to the LED elements of the specific LED unit, and the lamp life can be extended. Furthermore, the heat generation of the elements on the light emitting diode driving device side and the LED unit side can be made uniform, which is advantageous in heat dissipation design.
<Example 2>

  The light emitting diode driving device 600 according to the first embodiment described above can suppress flickering of light emission by equalizing the length of the lighting time for each LED unit. Furthermore, in order to suppress flickering of light emission, the first rectified voltage and the second rectified voltage subjected to half-wave rectification can be smoothed. An example of such a circuit is shown in FIG. Here, a specific circuit configuration example of a light emitting diode driving device including the smoothing circuit shown in FIG. 5 is shown. In the light emitting diode driving device 700 of FIG. 9, members similar to those in the first embodiment are denoted by the same names and reference numerals, and detailed description thereof is omitted.

  The light emitting diode driving device 700 includes a smoothing capacitor 80 as a smoothing circuit. By providing the smoothing capacitor 80, the first rectified voltage and the second rectified voltage that have been half-wave rectified are respectively smoothed. As a result, the low voltage section is reduced, and the first LED in such a low voltage section is reduced. The section in which the part 11 and the fourth LED part 14 are turned on becomes longer, and an advantage that the uneven light emission can be further suppressed is obtained. The smoothing capacitor 80 is generally a large-capacity electrolytic capacitor. However, although the electrolytic capacitor has a large capacity, it deteriorates with time due to evaporation of the electrolytic solution and has a lifetime, so that the lifetime of the LED driving device is determined by the lifetime of the electrolytic capacitor.

  As described above, according to the embodiment of the present invention, it is a conventional problem that the AC power source is connected to the AC power source and driven with high efficiency without using the voltage conversion circuit that converts the AC power source to DC with a switching power source or the like. Further, there is an advantage that the variation in the lighting period for each LED can be suppressed with a relatively simple configuration. In other words, since the light-emitting diode is a constant voltage element, when the light-emitting diode is lit and driven with a rectified voltage obtained by rectifying the AC power supply, the lighting time and power are different for each LED unit, and an illuminance difference occurs between the LED units. End up. If all LED units are formed on, for example, the same package or the same chip, or if a single LED is disposed in a relatively small area, illumination at a relatively distant location relative to that area, such as ceiling illumination, With an LED bulb, such a difference in illuminance is not noticeable, and there is no particular problem. However, in applications where LEDs are arranged in a relatively large area and uniform irradiation illuminance is required, such as backlight illumination and signboard illumination, the illuminance difference tends to be noticeable. On the other hand, if the lighting period of some of the LEDs is long, the amount of heat generation increases accordingly, but the amount of heat generation of the LEDs having a short lighting time decreases. If some of the LEDs deteriorate and stop lighting, the life of the entire light emitting device is reached. Therefore, it is necessary to suppress the progress of deterioration of specific LEDs. In order to prevent this, a special heat dissipation mechanism that equalizes the heat dissipation performance is required. In contrast, in the embodiment of the present invention, the lighting circuit is configured so that the first rectified voltage and the second rectified voltage that are half-wave rectified are opposite to each other without making the lighting order of the LED portions constant. The lighting time between the LED portions is made uniform. As a result, the difference in illuminance between LEDs is eliminated, the amount of heat generation is made uniform, the life and reliability of the apparatus are improved, and it can be suitably used as higher quality lighting and fishing lights.

  The light emitting diode driving device according to the present invention, the illumination and fishing light using the same, and the driving method of the light emitting diode driving device can be suitably used as a lighting device and a fishing light. In particular, by suppressing the flickering of the LED portion, it is possible to reduce discomfort due to flickering of high illumination light that an operator working under an LED fishing light has.

100, 200, 300, 400, 500, 600, 700, 900 ... Light-emitting diode driving device 1 ... First circuit group 2 ... Second circuit group 10 ... First LED assembly 11 ... First LED unit 12 ... Second LED Unit 13 ... Third LED unit 14 ... Fourth LED unit 20 ... Current control unit 21 ... First energization control unit 22 ... Second energization control unit 23 ... Third energization control unit 24 ... Fourth energization control unit 21B ... First Energization control transistor 22B ... Second energization control transistor 23B ... Third energization control transistor 24B ... Fourth energization control transistor 25B ... Fifth energization control transistor 26B ... Sixth energization control transistor 27B ... Seventh energization control transistor 28B ... Eighth energization control transistor Control transistor 25 ... fifth energization control unit 26 ... sixth energization control unit 27 ... seventh energization control unit 28 ... eighth energization control unit 31 ... first current control unit; 31 Operational amplifier 31B0 Constant voltage power supply 31B1 Operational amplifier power supply transistor 31B2 Zener diode 31B3 Zener voltage setting resistor 32 Second current control unit 32B Operational amplifier 32B0 Constant voltage power supply 32B1 Operational amplifier power supply transistor 32B2 Zener diode 32B3 ... Zener voltage setting resistor 40 ... Current detector 41 ... First current detector 41B ... First current detection resistor 42 ... Second current detector 42B ... Second current detection resistor 50 ... Rectifier circuit 51 ... First half-wave rectifier circuit 52 ... 2nd half wave rectification circuit 61 ... 1st harmonic suppression signal generation part 61a, 61b ... 1st harmonic suppression signal generation resistance 62 ... 2nd harmonic suppression signal generation part 62a, 62b ... 2nd harmonic suppression signal Generating resistor 71... First current control signal applying unit 71a, 71b, 71c... Current control signal applying Zener Diode 72 ... Second current control signal applying unit 72a, 72b, 72c ... Current control signal applying Zener diode 80 ... Smoothing capacitor 82 ... Bypass capacitors 161, 162, 163, 164, 165, 166 ... LED block 167 ... Switch control unit 171 , 172, 173, 174 ... light emission block 177 ... switch control logic AP ... AC power supply OL ... output line BP1 ... first bypass route BP2 ... second bypass route BP3 ... third bypass route BP4 ... fourth bypass route SA, SB ... Switch block SA_1, SA_2, SA_3, SB_1, SB_2, SB_3 ... switch

Claims (9)

A first half-wave rectifier circuit connected to an AC power source for half-wave rectifying the AC voltage of the AC power source to obtain a first rectified voltage;
A first LED unit including at least one LED element connected in series with the output side of the first half-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 for controlling the energization amount to the first LED unit in a state where the first rectified voltage is applied in parallel with the second LED unit and connected in series with the first LED unit. And
Second energization for controlling the energization amount to the first LED unit and the second LED unit in a state where the first rectified voltage is applied, which is connected in series with the first LED unit and the second LED unit. A control unit;
A first current control unit for controlling the first energization control unit and the second energization control unit based on a current value flowing through the first LED unit in a state where the first rectified voltage is applied;
A second half-wave rectifier circuit connected to a common alternating-current power source to obtain a second rectified voltage by half-wave rectifying the alternating-current voltage of the alternating-current power source at a timing different from that of the first half-wave rectifier circuit;
A sixth energization control for controlling the energization amount to the second LED unit in a state where a second rectified voltage is applied in parallel with the first LED unit and in series with the second LED unit. And
The first LED unit and the second LED unit are connected in series with the first LED unit between the output side of the second half-wave rectifier circuit and the first LED unit, and a second rectified voltage is applied. A fifth energization control unit for controlling an energization amount to the LED unit, and a fifth rectification voltage and a sixth energization control unit based on a current value flowing through the second LED unit in a state where a second rectified voltage is applied; A second current control unit for controlling the energization control unit;
A light emitting diode driving device. The light-emitting diode driving device according to claim 1,
The first current control unit turns on the first LED unit in a state where the first rectified voltage is applied from the output side of the first half-wave rectifier circuit, and then turns on the first LED unit. The second LED unit is turned on, and further driven to turn off the second LED unit while the first LED unit is turned on,
The second current control unit turns on the second LED unit in a state where a second rectified voltage is applied from the output side of the second half-wave rectifier circuit, and then turns on the second LED unit. A light-emitting diode drive device that is turned on so that the first LED unit is turned on, and the second LED unit is turned on while the first LED unit is turned off. The light-emitting diode driving device according to claim 1, further comprising:
A light emitting diode driving device comprising a first current detection unit for detecting the amount of current flowing through the first LED unit, connected in series with the second LED unit, on the downstream side of the second LED unit. The light-emitting diode driving device according to any one of claims 1 to 3, further comprising:
A light emitting diode driving device comprising a second current detection unit for detecting the amount of current flowing through the second LED unit, connected in series with the first LED unit, upstream of the first LED unit. A first half-wave rectifier circuit connected to an AC power source for half-wave rectifying the AC voltage of the AC power source to obtain a first rectified voltage;
A first LED unit including at least one LED element connected in series with the output side of the first half-wave rectifier circuit;
A second LED unit including at least one LED element connected in series with the first LED unit;
A third LED part including at least one LED element connected in series with the second LED part;
A first energization control for controlling the energization amount to the first LED unit in a state where the first rectified voltage is applied in parallel with the second LED unit and connected in series with the first LED unit. And
Second energization for controlling the energization amount to the first LED unit and the second LED unit in a state where the first rectified voltage is applied, which is connected in series with the first LED unit and the second LED unit. A control unit;
Energization to the first LED unit, the second LED unit, and the third LED unit connected in series with the first LED unit, the second LED unit, and the third LED unit in a state where a first rectified voltage is applied. A third energization control unit for controlling the amount;
A first current for controlling the first energization control unit, the second energization control unit, and the third energization control unit based on a current value flowing through the first LED unit in a state where the first rectified voltage is applied. A control unit;
A second half-wave rectifier circuit connected to a common alternating-current power source to obtain a second rectified voltage by half-wave rectifying the alternating-current voltage of the alternating-current power source at a timing different from that of the first half-wave rectifier circuit;
When viewed from the third LED unit, the amount of current supplied to the third LED unit in a state where a second rectified voltage is applied in series with the third LED unit and in parallel with the second LED unit. A seventh energization control unit for controlling
When viewed from the second LED unit, the second LED unit and the third LED are connected in series with the second LED unit and in parallel with the first LED unit with a second rectified voltage applied. A sixth energization control unit for controlling the energization amount to the unit;
The first LED unit and the second LED unit connected in series with the first LED unit between the output side of the second half-wave rectifier circuit and the first LED unit, with the second rectified voltage applied. A fifth energization control unit for controlling the energization amount to the LED unit and the third LED unit;
Control the fifth energization control unit, the sixth energization control unit, the seventh energization control unit, and the eighth energization control unit based on the current value flowing through the third LED unit in a state where the second rectified voltage is applied. A second current control unit for
A light emitting diode driving device. A first half-wave rectifier circuit connected to an AC power source for half-wave rectifying the AC voltage of the AC power source to obtain a first rectified voltage;
A first LED unit including at least one LED element connected in series with the output side of the first half-wave rectifier circuit;
A second LED unit including at least one LED element connected in series with the first LED unit;
A third LED part including at least one LED element connected in series with the second LED part;
A fourth LED unit including at least one LED element connected in series with the third LED unit;
A first energization control for controlling the energization amount to the first LED unit in a state where the first rectified voltage is applied in parallel with the second LED unit and connected in series with the first LED unit. And
Second energization for controlling the energization amount to the first LED unit and the second LED unit in a state where the first rectified voltage is applied, which is connected in series with the first LED unit and the second LED unit. A control unit;
Energization to the first LED unit, the second LED unit, and the third LED unit connected in series with the first LED unit, the second LED unit, and the third LED unit in a state where a first rectified voltage is applied. A third energization control unit for controlling the amount;
The first LED unit, the second LED unit, the third LED unit connected in series with the first LED unit, the second LED unit, the third LED unit, and the fourth LED unit in a state where a first rectified voltage is applied. A fourth energization control unit for controlling the energization amount to the LED unit and the fourth LED unit;
The first energization control unit, the second energization control unit, the third energization control unit, and the fourth energization control unit are controlled based on the current value flowing through the first LED unit in a state where the first rectified voltage is applied. A first current control unit for
A second half-wave rectifier circuit connected to a common alternating-current power source to obtain a second rectified voltage by half-wave rectifying the alternating-current voltage of the alternating-current power source at a timing different from that of the first half-wave rectifier circuit;
An eighth energization control for controlling an energization amount to the fourth LED unit in a state where a second rectified voltage is applied, which is connected in series with the fourth LED unit and in parallel with the third LED unit. And
In order to control the energization amount to the third LED part and the fourth LED part in a state where a second rectified voltage is applied in series with the third LED part and in parallel with the second LED part. A seventh energization control unit of
Energizing the second LED unit, the third LED unit, and the fourth LED unit in a state where a second rectified voltage is applied in series with the second LED unit and in parallel with the first LED unit A sixth energization control unit for controlling the amount;
The first LED unit and the second LED unit connected in series with the first LED unit between the output side of the second half-wave rectifier circuit and the first LED unit, with the second rectified voltage applied. A fifth energization control unit for controlling the energization amount to the LED unit, the third LED unit, and the fourth LED unit;
Controls the fifth energization control unit, the sixth energization control unit, the seventh energization control unit, and the eighth energization control unit based on the current value flowing through the fourth LED unit in a state where the second rectified voltage is applied. A second current control unit for
A light emitting diode driving device. The light-emitting diode driving device according to any one of claims 1 to 6, further comprising:
A light emitting diode driving device comprising a smoothing capacitor connected in parallel to the series connection body of the first LED part and the second LED part.   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 7.

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