JP2007129887A - Dynamo lighting set for bicycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accelerate the simplification, compactness, and weight reduction of a lighting circuit by superimposing a DC voltage and an AC voltage as making use of windings of a generator to remove a conventional superimposing converter or transformer, to reduce a power generation load by improving comprehensive efficiency, and to provide a quality lighting light, in a lighting fixture in which a generator is incorporated or combined with an LED used as a light source like a dynamo lighting set for a bicycle. <P>SOLUTION: Power generation coil provided in the generator is utilized for superimposing a DC start voltage of a light emission and an AC drive voltage of a light emission. Furthermore, three pieces of the power generation coils are combined to perform three-phase AC power generation of the phase angle of 120°. By rectifying and synthesizing the three-phase AC, an uninterrupted voltage and current are supplied to an LED to supply the lighting light having less flicker. Moreover, a smoothing capacitor is provided between output lines after the rectification and synthesis as required to make it possible to provide the high-quality lighting light extremely suppressing ripples by smoothing a forward voltage of the LED. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power generation and lighting drive circuit for a small generator such as a bicycle power generation lamp mainly using a light emitting diode (hereinafter referred to as LED) as a light source.

  A wide variety of lighting devices for bicycles using LEDs as the light source are commercially available. As the background, it is due to the practical use and spread of recent white light emitting LEDs (hereinafter referred to as white LEDs) and light bulb color light emitting LEDs (hereinafter referred to as light bulb color LEDs). However, there are many simple lighting methods combining dry batteries and a current limiting resistor or a constant current diode.

In order to use an LED for a bicycle power generation lamp, it is necessary to convert an alternating current from the generator into a direct current and supply it to the LED.
FIG. 1 shows an example of a typical lighting circuit. The rectifier circuit includes a diode bridge DB, a smoothing capacitor, a constant voltage diode ZD1 for overvoltage protection, and a current limiting circuit including a constant current diode CRD and a resistor R3. An LED light emitting unit is constituted by two parallel circuits in which four LEDs are connected in series.

  In the circuit of FIG. 1, the natural feeling that the light emission intensity increases according to the traveling speed cannot be obtained unlike the incandescent light bulb. In such a phenomenon, although the forward current page F and the light emission intensity are generally proportional, the forward current IF that contributes to practical light emission does not flow and does not emit light below a certain forward voltage VF, and when a certain forward voltage VF is exceeded. The basic characteristic of the LED that the forward current IF increases rapidly makes control difficult.

FIG. 2 shows a typical example of the forward voltage VF vs. forward current IF characteristic of the white LED.
If the forward voltage VF does not reach approximately 3.0V for one LED, it does not emit light practically. When the voltage increases by only 0.5 V, the standard forward current (IF = about 20 mA) is reached, and further voltage and current need to be limited. From this characteristic, it can be seen that the forward voltage VF applied to the LED and the light emission intensity are not in a proportional relationship. This characteristic leads to the fact that the speed of the bicycle and the light emission intensity of the LED are not proportional. Since this is a case of one LED, when a plurality of LEDs are used, each voltage value becomes a plurality of times.

  In the case of the circuit of FIG. 1, when the generator output is approximately 8.5 V (rms) or less, light is not practically emitted, and when it exceeds about 10 V (rms) after starting to shine, an overcurrent state occurs. That is, it does not emit light until it exceeds a certain traveling speed, and when it starts to shine, the brightness increases rapidly and exceeds the allowable current value. For example, on the basis of a predetermined speed, practical light emission cannot be obtained at a speed range of 85% or less, and when it exceeds that, the brightness suddenly becomes brighter. In the speed range exceeding 100%, it is necessary to finally dissipate the energy generated by the constant voltage diode, the constant current diode, and the resistor as heat.

  Practically, fortunately, the forward current IF of the LED is absolutely smaller than that of the conventional light bulb and the low cost of the LED is due to the high cost of the LED. With the help, it was possible to cope with heat dissipation by combining with the constant current diode CRD and the resistor R3. In any case, it is difficult to say that the output of the generator is effectively utilized, requiring an excessive power generation load and increasing the running resistance.

  The forward voltage VF vs. forward current IF characteristic of the LED shown in FIG. 2 causes a great loss even when using a dry battery. In extreme terms, a minimum of three 1.5V batteries are needed to illuminate a single white LED, two of which are spent maintaining the voltage to start emitting light. . And it is necessary to replace three batteries connected in series at the same time. To deal with the enormous loss, an expensive step-up converter incorporating an electronic circuit such as an IC is required, which is accompanied by problems of efficiency and reliability, a problem of switching noise, and the like.

  There was also a problem in the case of lighting equipment incorporating a portable generator. In order to light the LED, it is necessary to drive the generator at a predetermined number of revolutions or more, and there has been a problem that the LED does not emit light in the decelerated power generation region where the conventional incandescent light bulb is dimmed. Unlike conventional incandescent bulbs, the natural feeling that light emission intensity was obtained in proportion to mechanical input could not be obtained. Above all, manually rotating the generator at high speed is a difficult task, and the higher the speed, the greater the mechanical drive loss and the lower the efficiency. As a countermeasure, after a secondary battery or the like is rapidly charged, the secondary battery is turned on via a lighting control circuit as a power source.

As a method of eliminating the drawbacks caused by the characteristics of such LEDs, a method of supplying a forward voltage VF at which the LED starts to shine with a DC power source and a voltage for driving and emitting light and a forward current IF with AC power is provided. A patent application has been filed by the present applicant (see Patent Document 1). The summarized contents are published in technical journals (see Non-Patent Document 1).
Japanese Patent Application No. 2005-21875 (FIGS. 1, 6, and 12) “EDN Japan no. 56 October 1005” p. 107 Lead Business Information Co., Ltd.

  FIG. 3 shows the basic circuit. It consists of a combination of a DC closed circuit and an AC closed circuit that share the secondary winding of the transformer or transformer T1. The DC closed circuit is composed of a Batt (+), R2, D3, T1 secondary winding, R1, LED, and Batt (-) based on a DC power supply that supplies a forward current IF that causes the LED to emit light weakly. . The AC closed circuit includes a T1 secondary winding, R1, LED, C1, and D1 based on the T1 secondary winding.

  The current from the DC power supply supplies a weak forward current IF that causes the LED to emit weak light by means of the high resistance values R2 and D3. The closed circuit is charged with a forward voltage VF (hereinafter referred to as a light emission start voltage VFo) at the time of weak light emission of the LED, and the capacitor C1 is also charged with the light emission start voltage VFo and has a charge for supplying an alternating current. store. In general, the voltage at which the weak light emission of the white LED can be confirmed is about 2.5V, so the following description will be made assuming that the light emission start voltage VFo≈2.5V / piece.

  The superimposition of the DC voltage and the AC voltage is performed by the secondary winding of the transformer or transformer T1. A half cycle on the boosting side where the DC voltage and the AC voltage are superimposed flows to the LED by the rectifying action of the LED and emits light. The half-cycle portion on the step-down side due to the superposition flows to the reverse current diode D1 for bypass, and functions to return the charge equivalent amount that has flowed to the LED to C1.

  Due to the action of the capacitor C1, the supply current from the DC power supply may be a supply capacity for waiting for the LED to emit light weakly, and the power supply capacity may be small. Actually, it is necessary to replenish the portion consumed by the DC resistance of each part, but its function is not to supply the current for main light emission.

  Since the circuit in FIG. 3 performs a lighting operation every half cycle, flicker may be felt at a low output voltage or the like when the generator is rotating at a low speed. As a countermeasure, the circuit of FIG. 4 has been proposed. The rectifying action of the two sets of secondary windings and the forward diode D2 provides alternating current to the LED, thus improving flicker.

  In the circuit of FIG. 4, the DC power supply portion is replaced with a voltage doubler rectifier circuit so that only an AC input is required. A voltage doubler rectifier circuit composed of a rectifier diode D4 and a rectifying / smoothing capacitor C4 promptly raises a DC voltage by using an AC voltage on the primary side as input, and secures a light emission start voltage VFo.

  In the circuit of FIG. 4, the LED starts to emit light when the input voltage is about 1.4 V (rms). This value of about 1.4 V corresponds to a voltage at which the double voltage rectified voltage exceeds all the forward voltage drops of the DC closed circuit, a weak current flows through the LED, and weak light emission starts. Therefore, the forward voltage drop characteristics of D4, D3, and D2 affect the light emission start voltage. When a plurality of LEDs are connected in series, the ratio of the forward voltage drop of the rectifier diode is relatively lowered, and when four LEDs are connected in series, light emission starts from about 4.0V. If the light emission start voltage VFo is maintained by an individual DC power source as in the circuit of FIG. 3, light is emitted in proportion to the AC input voltage of approximately 0V.

  However, since these circuits use a secondary winding of a transformer or a transformer to superimpose a DC voltage and an AC voltage, there remains a problem that the circuit becomes large and heavy. Although there is a rationality to use a transformer as a step-down converter for AC input of commercial power, in a bicycle generator lamp with a generator or a portable device with a built-in generator, The function of winding and transformer or transformer winding was duplicated.

  In light of the problem in the previous section, lighting devices such as bicycle power generation lamps that use LEDs as a light source and built-in or combined with a generator can utilize the windings of the generator to make a DC voltage and an AC voltage. By superimposing and eliminating the conventional superposition transformer or transformer, the lighting circuit is simplified and reduced in size and weight, the overall efficiency is increased and the power generation load is reduced. It is an issue to provide.

Means to solve the problem

  In the present invention, the power generation coil provided in the generator is used to superimpose the DC light emission start voltage VFo and the light emission drive AC voltage. Further, three-phase AC power generation with a phase angle of 120 degrees is performed by combining three power generation coils. By rectifying and synthesizing the three-phase alternating current, an uninterrupted voltage and current are supplied to the LED to provide illumination light with less flicker. Further, by providing a smoothing capacitor between the rectified and combined output lines, high-quality illumination light with almost no pulsation is provided.

  A general small power generator excluding a power generator using a piezoelectric element has a permanent magnet and a power generating coil as its basic configuration. The winding of the generator coil can be used as a superposed winding instead of the secondary winding of the conventional circuit. Both generate a voltage by changing the magnetic flux passing through the winding. The change in magnetic flux due to the alternating current applied to the primary winding of the transformer or the like and the iron core can be replaced by the change in the magnetic polarity of the rotating permanent magnet in the generator.

FIG. 5 shows a basic circuit of the present invention. Hereinafter, description will be given with reference to the drawings.
The power generation coils L1, L2, and L3 are installed at intervals of 60 degrees around the four-pole permanent magnet MG rotating by the generator, and the DC power generation coil L4 is installed at an arbitrary angle. L4 secures VFo during low-speed traveling by winding many windings thinner than other power generating coils for the purpose of promptly securing the light emission start voltage VFo. Since the supply current of L4 is only a few mA, it is easy to secure a voltage by increasing the number of turns, so that a DC power supply unit is configured by a full-wave rectifier circuit including a diode bridge DB and a smoothing capacitor C5. The DC power supply unit may be a voltage doubler rectifier circuit.

  The voltage of the DC power supply unit charges the windings L1 to L3 and the DC blocking capacitor C1 with the light emission start voltage VFo through the current limiting resistor R2 and the current backflow prevention diode D3. In the circuit example of FIG. 5, the light emission start voltage VEo of a general white LED is 2.4 to 2.5 V / piece, so it is charged at about 10 V and maintains a weak light emission state.

FIG. 6 is a schematic diagram of a voltage waveform obtained by superimposing the output voltage of each power generation coil on the light emission start voltage VFo by the circuit of FIG.
FIG. 7 shows a schematic diagram of a voltage waveform synthesized by the forward diode D2 and applied to the LED light emitting unit Lu2.

  Practical light emission power is supplied by the power generation coils L1 to L3 that generate the alternating current voltage for lighting, and the light emission start voltage VFo≈10V charged in C1 is the reference voltage for the power generation operation. The power generation capacity of L1 to L3 needs to be set according to the standard forward current IF of the LED and the number of series connections. Since the standard forward current IF of a general white LED is about 20 mA and the standard forward voltage VF is about 3.5 to 3.6 V, the rated power generation capacity of L1 to L3 is rated current = 40 mA (rms), rated voltage = 4.5 to 6 V (rms), about 0.24 VA.

    The AC voltage generated by L1 to L3 is superimposed on the basis of the light emission start voltage VFo of 10 V, and the half-cycle on the boosting side passes the forward diode D2 to pass a current to the LED light emitting unit Lu2. The half-cycle on the step-down side passes through the reverse current diode D1 for bypassing, and the electric charge that shines the LED is returned to C1 to be recharged.

  After the closed circuit is charged with the light emission start voltage VFo = 10 V, the forward current IF increases or decreases even with a slight voltage change of the AC input voltage, thereby increasing or decreasing the light emission intensity of the LED. In this case, AC input voltage 0V≈LED light emission start voltage VFo, AC input voltage 4.5 to 6.6V≈LED reference forward voltage VF, and forward current IF is almost equal to AC input voltage. Proportionally changes. That is, the light emission intensity of the LED changes in proportion to the AC output of the generator. And a running speed and emitted light intensity can be changed substantially proportionally.

  In the circuit example of FIG. 5, since three power generating coils are combined, a voltage is applied to the LED at a phase angle of 120 degrees, and a forward current IF can flow. Specifically, although both the voltage waveform and the current waveform are distorted by the direct current resistance and the flowing current, the distortion is not transmitted to the outside as in a commercial power supply, and the radiation noise is very rarely emitted.

  Basically, a smoothing capacitor is not used on the load side in anticipation of operation based on a sine wave, but since the synthesized voltage can secure about 70% or more of the AC voltage, practical continuous light emission is possible. Can be maintained. When the smoothing capacitor C2 is provided, even a small-capacitance capacitor is effectively smoothed to maintain a more uniform light emission intensity. However, since the DC voltage increases, it is necessary to adjust the constant of the current limiting resistor R3. And the spire value of the output current and the input current is increased, and the waveform distortion is further increased.

The invention's effect

  The greatest effect of the present invention is that a transformer and a transformer in the conventional superposition circuit are not required, and the power generation capacity of the power generation coil can be greatly reduced. The former will immediately lead to cost reduction and downsizing.

  The latter reduction in power generation capacity is mainly due to a reduction in drive voltage required by the lighting circuit. Compared with the conventional full-wave rectifier circuit, the circuit example of FIG. 5 can reduce the generated voltage by 40% to 50%. This facilitates winding processing of the power generation coil, leading to downsizing and cost reduction. The additional generator coil for generating DC voltage only needs to be subjected to high-voltage, low-current winding processing, and high-precision winding work is not required, and cost increase can be minimized.

In the lighting circuit according to the present invention, since the LED can emit light from the low output of the generator, it is possible to provide a light emission intensity substantially proportional to the traveling speed from the low speed traveling to the predetermined speed. Efficient power generation and lighting can be performed. In particular, excessive current that has been bothered by heat generation in the past is not unnecessarily generated, so that a current limiting device is not required. Accordingly, R3 in the circuit of the present invention has a characteristic for fine adjustment of variation due to differences in LED types and manufacturing lots.

  Since the wheel contact drive type power generation lamp can set the rotational speed of the generator high, the power generation efficiency can be increased and the parts can be miniaturized. By reducing the size of the components, components such as a rectifier circuit can be stored in the power generation lamp body. The housing of the circuit makes it easy to equip a plurality of power generation coils, and multiphase power generation can be easily performed in combination with a multipolar permanent magnet.

  The realization of the high-speed rotating multiphase generator can make the driving torque of the generator uniform and greatly reduce it. This reduction in driving torque makes it possible to weaken the contact pressure on the wheels, and can greatly reduce the load during power generation travel. Furthermore, it is possible to drive a windmill by running wind.

  Reduction and equalization of the pulsation width of the drive torque by performing multiphase power generation is extremely important and effective when a generator is built in a portable device or the like. Stable drive torque and smooth rotation according to the power generation load are indispensable in the case where the start and stop are frequently repeated in order to keep the power generation voltage constant and the low speed rotation is maintained. Thereby, it becomes possible to effectively utilize the repelling power to the limit.

  Since the LED lighting circuit according to the present invention can emit an LED according to a mechanical input even in a weak power generation region of a power generation coil, various power generation modes are configured in combination with a permanent magnet. be able to. For example, it is possible to realize power generation and lighting with minute energy, which has been difficult in the past, such as power generation lighting due to fine vibrations and power generation lighting due to large vertical movements during walking. In addition, since lighting at that time can be performed simultaneously with power generation, a secondary battery, a charge control circuit, and the like are not required, and can be provided at low cost.

  By incorporating a power generator that uses an elastic body such as a mainspring as a power source, it can be applied to a portable lighting device, and an LED lighting apparatus using a mainspring power generator can also be realized. By applying it to LED lamp type flashlights that conventionally used dry batteries, there is no need to worry about running out of batteries, leading to environmental protection through resource saving.

  In the present invention, the superimposing function that the secondary winding of the transformer or transformer was assigned in the conventional circuit is replaced with the power generation winding of the generator. From this, the best mode of the present invention is best for portable devices with built-in generators and bicycle power generation lamps having a structure in which a generator and a lighting circuit board are integrated to light an LED light emitting unit as a light source. The form is as follows.

  The LED light-emitting unit that is the load can be connected to the (+) and (-) two lead wire lighting circuits, so it is not necessary to be integrated with the generator or lighting circuit board, but multi-phase power generation using multiple generator coils Since the wiring is complicated to perform the above, the effect of the present invention can be maximized by integrating the power generating coil and the lighting circuit board.

  In the present embodiment, a wheel contact drive type bicycle power generation lamp using eight white LEDs as a light source will be described. The reference power of eight general white LEDs is about 0.6 W, which is about 1/4 of the conventional incandescent bulb 2.4 W. Along with this reduction in load power, the rotation speed of the generator can be set high in this embodiment, so that it is possible to generate power at a frequency of several tens Hz to several hundred Hz by combining with a multipolar permanent magnet, and driving torque Can be greatly reduced.

  Furthermore, since high-frequency power generation is possible, three or more miniaturized power generation coils can be installed. The three power generation coils enable three-phase power generation with a phase angle of 120 degrees, the voltage after rectification can be maintained uniformly high, and flicker can be greatly reduced. Further, the permanent magnet can be greatly reduced in size, and the circuit board assembly can be accommodated in the main body.

  Specific structural examples are shown in FIGS. FIG. 8 is a perspective view seen from obliquely above in a state in which the main body is cross-sectioned in order to explain the schematic structure inside the generator main body. FIG. 9 is a perspective view of the same state as viewed obliquely from below. Hereinafter, a description will be given with reference to the drawings.

  The LEDs 1a are arranged in two rows of four in series connection on a light source unit substrate 1b whose surface is printed in white, and are connected to a current adjusting resistor or the like on the back surface. The substrate 1b is fixed to the light source unit main body 1c and is coupled to the generator main body 3 by the arm 2. Although not shown, the lead wire is also wired along the arm 2. A transparent cover 1d is press-fitted into the light source unit main body 1c so as to cover the tip of the light source unit main body 1c and the LED 1a. Since replacement of the LED 1a is not necessary, airtightness is achieved by press-fitting and waterproofing and dustproofing are achieved. The vertical light distribution adjustment can be performed by rotating the entire light source unit 1. If more precise light distribution control is to be performed, the transparent cover may be replaced with a prism lens or the like.

  By the rotor 4 rotating in contact with the wheel, the rotating shaft 6 fastened by the nut 5 and the permanent magnet 7 fixed to the rotating shaft 6 rotate together. The permanent magnet 7 is made thin in accordance with a decrease in power generation load, and has a 4-pole multi-pole magnetization on the lower surface so that the magnetic poles are opposed to each other at the center and the outside, thereby preventing performance degradation and gaining space. . The rotary shaft 6 is positioned by bearings 8 disposed at two positions above the lower end and the permanent magnet 7. The generator body 3 and the rotary shaft 6 are waterproofed and dustproofed by a sealing material 9 or the like at the upper end.

  On the lower surface of the rotating permanent magnet 7, a power generating coil 10 wound around a bobbin having a square hole in the center is disposed. Three for lighting power generation and one for securing DC voltage, a total of four are arranged. The power generation coil 10 is attached to the outer peripheral portion of the lighting circuit board 11 that is substantially inscribed in the generator body 3 to constitute a lighting circuit. The power generation coil 10a for lighting power generation attached to the outer peripheral portion is installed at intervals of 60 degrees, and performs three-phase power generation with a phase angle of 120 degrees. The generator coil 10b for securing the DC voltage is installed at an arbitrary angle on the outer periphery.

  The lighting circuit board 11 is provided with a hole or a notch to facilitate the incorporation of the iron core 12 into the power generation coil 10. The iron core 12 is formed in a U-shape, and is fixedly attached to the lighting circuit board 11 or the main body bottom cover 13 with the opening portion facing upward. Then, one leg penetrates the center of the power generation coil 10 to efficiently guide the magnetic flux from the magnetic poles provided at the center and the outer periphery of the permanent magnet 7 to the inside of the power generation coil 10 to improve power generation efficiency. Yes. The iron core 12 is preferably laminated by punching a thin sheet of electromagnetic steel sheet into a U shape, but when the absolute power generation amount is small as in this example, a thickness of 1.0 to 1 is punched into a rectangle. A 6 mm magnetic steel plate may be bent into a U shape.

  Electronic components other than the power generating coil 10 are also mounted on the lighting circuit board 11 to form a lighting circuit. In mounting electronic components, surface mounting components are used to mount on both sides of the board. By mounting the capacitor 14 having a particularly large shape on the lower surface of the outer peripheral portion of the lighting circuit board 11 that avoids contact with the iron core 12, high-density mounting can be performed.

  10 and 11 show an embodiment in which the light source unit 1 is separated so that the mounting position can be set in a wide range. FIG. 10 is an external perspective view with the fixing clip 15 attached. FIG. 11 is an external perspective view when attached to the pipe 16 of the bicycle handle.

  The light source unit 1 portion is based on the same structure as that of the light source unit portion of the first embodiment, and a coupling sphere 1e is added to the bottom portion. And although illustration is abbreviate | omitted from the bottom part, a lead wire is pulled out.

  The fixing clip 15 is formed of polycarbonate resin or the like having high mechanical strength and toughness, and includes a small U-shaped spherical clip 15a and a large U-shaped pipe clip 15b. At the center of the tip of the sphere clip, there is a round hole 15c for holding and holding the coupling sphere 1e. Both clips are joined together sharing a U-shaped bottom. The connecting portion 15d is formed to be thinner than both clip portions, and acts as a pseudo hinge by bending.

  Based on the principle of the lever using the coupling portion 15d and the coupling portion as a fulcrum, the coupling sphere 1e can be loosened when being assembled, and can be firmly held when attached to the handle pipe 16 or the like. Since the coupling sphere 1e is freely movable, the irradiation direction can be freely set. These effects can be achieved by using a small, light and low heat-generating LED as a light source.

  In the first and second embodiments, application implementation to a bicycle power generation lamp has been mainly described. However, these embodiments can also be applied to the implementation of a portable generator that uses a manual winding as a power source. It is.

  Recent portable devices have been rapidly reduced in power consumption, and have an operating voltage ranging from about 2V to 5V, but operate with a power consumption of about several tens of mW. On the other hand, the use time of batteries has become longer, but when this level is reached, the possibility of power supply by a generator emerges as a substitute for a dry battery or an AC adapter.

  By grasping both sides of the generator with one hand, the spring is wound up and power is generated for several minutes. The target is an operation of 30 minutes to 1 hour with several winding operations. If winding is possible even during the power generation operation, the devices will not stop halfway. Since there are various methods for switching and stabilizing the output voltage according to the load, the description is omitted.

  An LED lamp or a radio receiver can be incorporated into the generator, which is effective as an emergency disaster prevention device. A generator that employs a medium-size strut and a handle-type deceleration winding mechanism can be used as an LED table lamp, and can contribute to lighting in a later country that does not benefit from commercial power supply.

      It is an example of the conventional full wave rectifier capacitor smoothing type LED lighting circuit.       It is a characteristic view which shows a typical example of the forward voltage VF versus forward current IF characteristic of white LED.       It is an example of a basic circuit which superimposes alternating current on direct current using the conventional transformer secondary winding.       This is an example of a circuit improved to a full-wave rectified waveform by using two conventional secondary windings.       It is a basic circuit diagram of the example of the present invention.       It is a schematic diagram which shows the output voltage waveform of the power generation coil after superimposition by the Example of this invention.       It is a schematic diagram which shows the voltage waveform applied to LED after the rectification | combination synthesis | combination by the Example of this invention.       It is the perspective view which carried out the partial cross section which shows schematic structure of the electric power generation lamp by one Example of this invention.       It is the perspective view from the lower part which carried out the partial cross section which shows the same structure by one Example of this invention.       In one Example of this invention, it is a perspective view which shows the light source unit structure in the case of carrying out separation mounting.       FIG. 3 is an external perspective view showing a separated mounting state of the light source unit in one embodiment of the present invention.

Explanation of symbols

VGin AC input from small AC generator Batt DC power supply (battery)
T1 small transformer T3 small two-output winding transformer L1 to L3 AC lighting generator coil L4 DC voltage generator coil C1 DC blocking capacitor C2 LED forward voltage smoothing capacitor C3 smoothing capacitor C4 voltage doubler rectifying capacitor C5 voltage smoothing capacitor CRD constant current diode ZD1 constant voltage diode D1 reverse current diode D2 forward diode D3 current reverse current prevention diode D4 double voltage rectifier diode DB diode bridge R1 LED forward current limiting resistor R2 current limiting resistor R3 LED current limiting resistor in series connection LED Light emitting diode Lu1 Parallel connected light emitting unit Lu2 Series connected light emitting unit Vb Bias voltage generation circuit F Current limiting fuse Cn1 Input connector and wiring Cn2 Output connector and wiring VFo Forward current MG permanent magnet forward voltage IF LED of weak light emission starting voltage VF LED

1 Light source unit 1a LED
DESCRIPTION OF SYMBOLS 1b Light source unit board | substrate 1c Light source unit main body 1d Transparent cover 1e Coupling sphere 2 Arm 3 Generator main body 4 Rotor 5 Nut 6 Rotating shaft 7 Permanent magnet 8 Bearing 9 Sealing material 10 Power generation coil 10a AC power generation coil 10b For DC voltage generation Generator coil 11 Lighting circuit board 12 Iron core 13 Main body bottom cover 14 Capacitor 15 Clip 15a Sphere clip 15b Pipe clip 15c Round hole 15d Joint 16 Handle pipe

Claims (4)

  A small generator using a light emitting diode (LED) that emits white light as a light source load and its lighting control circuit are configured by combining an LED and a current limiting resistor in series and parallel. A DC voltage is applied to both ends of the input terminal of the LED light emitting unit via a high resistor adjusted so that the current is less than the weak light emission region, and the light emission start voltage in the forward voltage direction is maintained to stand by. An alternating current generator LED lighting device characterized by superimposing an alternating current power component from a generator on a light emission start voltage and applying a forward voltage boosted by the superposition to increase the forward current and causing the LED to emit light practically .   With the cathode side of the LED light emitting unit as the ground reference electrode, at least the power source for generating the light emission starting voltage, the current limiting high resistor for setting the light emission starting voltage, the current backflow prevention diode, the generator winding and the LED light emitting unit The anode side (including the current limiting resistor) is connected in series to form a DC closed circuit, and at least the DC cutoff capacitor, the generator winding and the anode side of the LED light emitting unit are connected in series. 2. The LED lighting device for an alternator according to claim 1, wherein an alternating current closed circuit is constructed, and the light emission start voltage and the alternating voltage due to the power generation are superimposed by the overlapping power generator windings.   2. A reverse-flow diode is inserted in the reverse direction between the cathode-side ground reference electrode and the anode-side electrode of the LED light-emitting unit, and charge transfer between both electrodes of the DC blocking capacitor is enabled and facilitated. LED lighting device for AC generators according to claim 2 and claim 2   Three or more sets of power generation windings are mounted, superposition operation is performed in each of the three sets of power generation windings, and a three-phase rectified waveform is simulated by combining them with diodes installed in the forward voltage direction. 3. The LED lighting device for an AC generator according to claim 1, wherein the LED lighting device is supplied to a light emitting unit to suppress pulsation of light emission intensity.

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