JP2007112172A - Power generating lamp for bicycle - Google Patents

Power generating lamp for bicycle Download PDF

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JP2007112172A
JP2007112172A JP2005302543A JP2005302543A JP2007112172A JP 2007112172 A JP2007112172 A JP 2007112172A JP 2005302543 A JP2005302543 A JP 2005302543A JP 2005302543 A JP2005302543 A JP 2005302543A JP 2007112172 A JP2007112172 A JP 2007112172A
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led
transistor
bicycle
power
resistor
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JP4613789B2 (en
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Jiyunya Kusumoto
殉也 楠本
Masuo Ota
益夫 大田
Hiroshi Kurihara
博志 栗原
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a power generating lamp for a bicycle capable of preventing an excess electric current of LED in increasing power generating quantity of a power generating part and free to miniaturize at low cost. <P>SOLUTION: This power generating lamp for a bicycle to light the LED by generated electric power by loading a generator to generate the electric power by travelling of the bicycle is furnished with a rectification part to rectify voltage from the generator, a control part to control lighting of the LED, a luminosity detection part to output a signal to the control part in accordance with luminosity in the circumference, a resistor serially connected to the LED, a transistor A to drive the LED by the signal from the control part a transistor B connected to a base between the LED and the resistor and a resistor which is a by-pass means serially connected to the transistor B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は自転車用発電ランプ、特にLEDへの過電流を防止する過電流防止回路に関するものである。   The present invention relates to a power generation lamp for bicycles, and more particularly to an overcurrent prevention circuit for preventing overcurrent to LEDs.

従来の自転車用発電ランプには、発電機として定格6V、2.4W〜3Wのハブダイナモが一般的に使用されており、走行速度が上昇するにつれ発電量も増加する。   In a conventional bicycle power generation lamp, a hub dynamo with a rating of 6 V, 2.4 W to 3 W is generally used as a generator, and the power generation amount increases as the traveling speed increases.

また、ランプ部への過電圧や過電流を防止するために、定電圧回路や定電流回路の保護回路が搭載されている。ランプ部に使用するLEDと並列にツェナーダイオードを接続することにより、高速走行時に電圧が上昇した場合も、ツェナーダイオードを負荷であるLEDの定格電圧に設定することにより、LEDに印加される電圧が一定電圧に制限され、さらに、定電流ダイオードあるいは電界トランジスタをLEDに直列に接続することにより定電流回路を構成し、LEDへの過電流を防止する(例えば特許文献1参照)。   In addition, in order to prevent overvoltage and overcurrent to the lamp unit, a constant voltage circuit and a protection circuit for the constant current circuit are mounted. By connecting a Zener diode in parallel with the LED used in the lamp section, even when the voltage rises during high-speed running, the voltage applied to the LED can be reduced by setting the Zener diode to the rated voltage of the LED as a load. A constant current circuit is configured by connecting a constant current diode or an electric field transistor in series with the LED in order to prevent overcurrent to the LED (see, for example, Patent Document 1).

また、ライト部と並列に電力用トランジスタ回路とスイッチング素子により、電圧クランプ回路を構成し、所定電圧以上の場合はスイッチング素子によりトランジスタをONし、ランプ部への印加電圧を制限する。あるいは発電機の交流出力部にフォトトライアックを配置し、LEDに流れる電流が所定値を超えた場合フォトトライアックを導通させ印加電圧を制限し、LEDへの過電流を防止する(例えば特許文献2、3参照)。   In addition, a voltage clamp circuit is configured by a power transistor circuit and a switching element in parallel with the light section. When the voltage is equal to or higher than a predetermined voltage, the transistor is turned on by the switching element to limit the voltage applied to the lamp section. Alternatively, a phototriac is arranged in the AC output section of the generator, and when the current flowing through the LED exceeds a predetermined value, the phototriac is turned on to limit the applied voltage and prevent overcurrent to the LED (for example, Patent Document 2, 3).

また、ランプ部に1W以上の高出力LEDを搭載することにより、整流回路と高出力LEDによる消費電力と発電電力を平衡させるものがある(例えば特許文献4参照)。
特開2003−212171号公報 特開2003−230300号公報 特開2003−276666号公報 特開2005−125993号公報
Some lamps have a high-power LED of 1 W or more to balance power consumption and generated power by the rectifier circuit and the high-power LED (see, for example, Patent Document 4).
JP 2003-212171 A JP 2003-230300 A JP 2003-276666 A JP 2005-125993 A

しかしながら、前記従来の自転車用発電ランプでは、ツェナーダイオードを使用したものは、発電部の電力増加に応じてツェナーダイオードの消費電力が増加するため発熱が発生する。このため電力用部品の使用と放熱板等の部品を必要とする。また、定電流ダイオードや電解トランジスタを使用したものも、前記ツェナーダイオードと同様に発電部の電力増加に応じて部品が発熱するため電力用部品と放熱板等の部品を必要とする。また電力用トランジスタとスイッチング素子を使用したものも、トランジスタには電力用部品を使用し、さらには放熱板などを使用して部品の発熱を抑制する必要があり回路が大型化し、電力用部品や放熱板の使用するためコスト高になる。フォトトライアックを使用したものはコスト高になる。また、高出力LEDを使用したものは、保護回路を必要としないが、高出力LEDがコスト高であると共に、高出力LED自身が発熱するため放熱構造を必要とするという課題を有していた。   However, in the conventional bicycle power generation lamp, a Zener diode that uses a Zener diode generates heat because the power consumption of the Zener diode increases as the power generation unit increases. For this reason, use of electric power parts and parts such as a heat sink are required. Also, a device using a constant current diode or an electrolytic transistor requires components such as a power component and a heat radiating plate because the component generates heat in response to an increase in power of the power generation unit, as in the case of the Zener diode. In addition, transistors that use power transistors and switching elements also use power components for the transistors, and heat sinks must be used to suppress heat generation of the components. Use of a heat sink increases costs. Using a photo triac is expensive. Moreover, although the thing using high output LED does not require a protection circuit, while high output LED was expensive, it had the subject that high output LED itself generate | occur | produces heat, and requires the heat dissipation structure. .

自転車の走行により発電する発電機を搭載し、発電した電力でLEDを点灯させる自転車用発電ランプであて、前記発電機からの電圧を整流する整流部と、前記LEDの点灯を制御する制御部と、周囲の明るさに応じて前記制御部に信号を出力する明るさ検出部と、前記LEDに直列に接続した抵抗と、前期制御部からの信号により前記LEDをドライブ
するトランジスタAと、前記LEDと前記抵抗間にベースを接続したトランジスタBと、前記トランジスタBに直列に接続したバイパス手段である抵抗とを備え、前記発電部の電力増加時に前記LEDの電流を検出し規定値以上になると、前記トランジスタBをオンしてバイパス電流を増加させることにより、前記発電部の出力電圧を抑制し、前記LEDへの過電流を防止するように構成するというものである。
A power generation lamp for a bicycle, which is equipped with a generator that generates electricity by running a bicycle and lights an LED with the generated power, a rectifying unit that rectifies the voltage from the generator, and a control unit that controls lighting of the LED; A brightness detection unit that outputs a signal to the control unit according to ambient brightness, a resistor connected in series with the LED, a transistor A that drives the LED by a signal from the previous control unit, and the LED And a transistor B having a base connected between the resistors, and a resistor that is a bypass means connected in series to the transistor B, and when the power of the power generation unit detects the current of the LED and exceeds a specified value, The transistor B is turned on to increase the bypass current, thereby suppressing the output voltage of the power generation unit and preventing overcurrent to the LED. Is that that.

本発明のバイパス手段を用いることによって、前記発電部の電力増加時に前記LEDの電流増加を検出し規定値以上になるとバイパス手段により電流を消費するため、出力電圧の上昇を抑制し、前記LEDへの過電流防止を小型で安価なコストで構成することができる。   By using the bypass means of the present invention, an increase in the output voltage is suppressed because the current consumed by the bypass means is detected when an increase in the current of the LED is detected when the power of the power generation unit is increased, and the current is consumed by the bypass means. The overcurrent prevention can be made small and inexpensive.

本発明によると、バイパス手段の電流消費により、発電部の出力電圧上昇を抑制し、LEDへの過電流を防止することがでるため、電力増加時にLEDを破壊することがない。またツェナーダイオード、トランジスタ等の電力用部品を使用せずに回路が構成でき、放熱板も必要ないため、小型化できると共に安価なコストで自転車用発電ランプを得ることができる。   According to the present invention, the current consumption of the bypass means can suppress an increase in output voltage of the power generation unit and prevent an overcurrent to the LED, so that the LED is not destroyed when the power increases. In addition, since a circuit can be configured without using power components such as a Zener diode and a transistor, and a heat sink is not required, it is possible to reduce the size and obtain a bicycle power generation lamp at a low cost.

以下本発明を実施するための最良の形態について、図面を参照しながら説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

図1は本発明の実施の形態における自転車用発電ランプの回路ブロック図である。図1において、自転車の走行により発電させる発電部1と、ブリッジダイオードと平滑用コンデンサである整流部2と、ランプである白色LED3と、前記白色LED3に直列に接続し電流を制限する抵抗4と、前記白色LED3をドライブするトランジスタAであるNPNトランジスタ5と、周囲の明るさを検出し明暗検出信号を出力する明るさ検出部6と、前記明るさ検出部6の明暗信号を入力し、前記NPNトランジスタ5をON/OFFして前記白色LED3の点灯を制御する制御部7と、前記抵抗4の電圧によりON/OFFするトランジスタBであるPNPトランジスタ8と、前記PNPトランジスタ8のON/OFFにより電流がバイパスされる抵抗を用いたバイパス手段9とを備えて構成されている。   FIG. 1 is a circuit block diagram of a bicycle power generation lamp according to an embodiment of the present invention. In FIG. 1, a power generation unit 1 that generates power by running a bicycle, a rectification unit 2 that is a bridge diode and a smoothing capacitor, a white LED 3 that is a lamp, and a resistor 4 that is connected in series to the white LED 3 and limits current. The NPN transistor 5 that is the transistor A that drives the white LED 3, the brightness detection unit 6 that detects ambient brightness and outputs a brightness detection signal, and the brightness signal of the brightness detection unit 6 are input. By controlling the lighting of the white LED 3 by turning the NPN transistor 5 ON / OFF, the PNP transistor 8 which is the transistor B which is turned ON / OFF by the voltage of the resistor 4, and the ON / OFF of the PNP transistor 8 And a bypass means 9 using a resistor that bypasses the current.

周囲が暗い状態で自転車の走行により、発電部1から電力が供給されていると、明るさ検出部6により暗検出し、制御部7に暗検出信号を出力する。前記信号を入力した制御部7はNPNトランジスタ5をONし、白色LED3を点灯させる。白色LEDに直列に接続された抵抗4の電圧は、PNPトランジスタ8のVBEの電圧となるため、VBEがONする電圧(例えば0.6V以上)となる電流が抵抗4すなわち白色LED3に流れると、PNPトランジスタ8がONしバイパス手段に電流を流す。抵抗4の値を0.6V時に白色LED3の定格電流となるように設定することより、白色LED3の電流が定格以上になるとバイパス手段9により余分な電力を消費させることで、過電流を防止することができる。   When power is supplied from the power generation unit 1 by running a bicycle in a dark environment, the brightness detection unit 6 detects darkness and outputs a dark detection signal to the control unit 7. The control unit 7 to which the signal is input turns on the NPN transistor 5 and turns on the white LED 3. Since the voltage of the resistor 4 connected in series to the white LED becomes the voltage of VBE of the PNP transistor 8, when a current that becomes a voltage at which VBE turns ON (for example, 0.6 V or more) flows to the resistor 4, that is, the white LED 3, The PNP transistor 8 is turned on to pass a current through the bypass means. By setting the value of the resistor 4 to be the rated current of the white LED 3 at 0.6 V, when the current of the white LED 3 exceeds the rating, excess power is consumed by the bypass means 9 to prevent overcurrent. be able to.

図2は定格6V、2.4Wの発電機の走行速度と出力電力の関係図である。例えば白色LED3に定格0.6W(VF=4.0V、IF=150mA)を使用すると速度5km/h以下では発電部の電力が0.6W以下となる。よって白色LED3の電流値が定格以下となり、トランジスタ8のVBEの電圧は0.6Vに達しないため、PNPトランジスタ8はONせず、バイパス電流は流れない。30km/hの高速走行時には3.5Wの電力が発生する。定格電力0.6W以上となるため、白色LED3には150mA以上電流が流れようとする。この時PNPトランジスタ8のVBEの電圧が0.6Vを超えるため、PNPトランジスタ8がONしバイパス電流を流す。このバイパス電流により電圧が抑
制されるため、白色LED3への過電流が防止される。その際、整流部と制御部で約1.1Wの電力が消費されるため、バイパス手段9では白色LED3のVF4.0VにPNPトランジスタ8のVBE0.6Vを加えた4.6Vで1.8Wの電力を消費するように抵抗(例えば12Ω、2W)を設定すると良い。よって、整流部の定格1.1Wと白色LEDの定格0.6Wの1.7W以上の発電があった場合は、白色LEDへの過電流を防止するため、発電量増加時にも白色LEDの破壊は生じない。
FIG. 2 is a diagram showing the relationship between the running speed and output power of a generator with a rating of 6V and 2.4W. For example, when a rating of 0.6 W (VF = 4.0 V, IF = 150 mA) is used for the white LED 3, the power of the power generation unit is 0.6 W or less at a speed of 5 km / h or less. Therefore, the current value of the white LED 3 becomes less than the rated value, and the voltage of VBE of the transistor 8 does not reach 0.6V. Therefore, the PNP transistor 8 is not turned on and no bypass current flows. When traveling at a high speed of 30 km / h, 3.5 W of power is generated. Since the rated power is 0.6 W or more, a current of 150 mA or more tends to flow through the white LED 3. At this time, since the voltage of VBE of the PNP transistor 8 exceeds 0.6 V, the PNP transistor 8 is turned on and a bypass current flows. Since the voltage is suppressed by this bypass current, overcurrent to the white LED 3 is prevented. At that time, about 1.1 W of power is consumed by the rectifying unit and the control unit. Therefore, the bypass means 9 adds 4.6 V of VBE of PNP transistor 8 to VF 4.0 V of white LED 3 and 1.8 W of 1.8 W. A resistor (for example, 12Ω, 2W) may be set so that power is consumed. Therefore, when there is power generation of 1.7W or more with the rating of 1.1W for the rectifier and the rating of 0.6W for the white LED, the white LED is destroyed even when the power generation amount is increased to prevent overcurrent to the white LED. Does not occur.

また、白色LEDに定格0.6Wを使用したが、定格0.5W〜1W未満のLEDでJIS C9502にある光度400cdを確保することができるため、1W以上の高出力LEDを使用せず且つ放熱構造を必要としないため、安価な白色LEDと過電流防止回路の付加により構成でき、コストを低減することが可能となる。   Moreover, although the rating of 0.6W was used for the white LED, it is possible to secure the luminous intensity of 400 cd in JIS C9502 with the LED having a rating of less than 0.5W to less than 1W. Since a structure is not required, it can be configured by adding an inexpensive white LED and an overcurrent prevention circuit, and the cost can be reduced.

また、発電機に定格6V、2.4Wを使用したが、バイパス手段である抵抗の設定を変えるだけで、一般的に使用されている定格6V、2.4W〜3Wの発電機に対応することが可能である。   Moreover, although rated 6V, 2.4W was used for the generator, it corresponds to the generator of the rated 6V, 2.4W-3W generally used only by changing the setting of resistance which is a bypass means. Is possible.

また、本発明で使用するNPNトランジスタおよびPNPトランジスタは、小信号トランジスタ(定格0.5W以下)を用いることができる。   Further, as the NPN transistor and the PNP transistor used in the present invention, a small signal transistor (rated value of 0.5 W or less) can be used.

また、白色LEDのドライブ用にNPNトランジスタを使用し、バイパス手段用にPNPトランジスタを使用したが、白色LEDのドライブ用にPNPトランジスタを使用し、バイパス手段用にNPNトランジスタを使用して構成することも可能である。   In addition, an NPN transistor is used for driving the white LED and a PNP transistor is used for the bypass means. However, a PNP transistor is used for driving the white LED, and an NPN transistor is used for the bypass means. Is also possible.

また、バイパス手段に定格2Wの電力型抵抗を用いたが、小電力抵抗(例えば定格電力0.5W程度)を数個接続して用いても良い。   In addition, although a power type resistor having a rating of 2 W is used for the bypass means, several small power resistors (for example, rated power of about 0.5 W) may be connected and used.

以上のように、本発明によれば小信号トランジスタと抵抗によりLEDへの過電流防止が可能になるので、安価な部品で小型化可能できる自転車用発電ランプとして有用である。   As described above, according to the present invention, it is possible to prevent an overcurrent to the LED by a small signal transistor and a resistor, so that it is useful as a bicycle power generation lamp that can be miniaturized with inexpensive parts.

本発明の実施の形態1に示す自転車用発電ランプの回路ブロック図Circuit block diagram of the bicycle power generation lamp shown in the first embodiment of the present invention 本発明の実施の形態1に示す自転車用発電ランプの発電機であるハブダイナモの走行速度と出力電力の関係図Relationship diagram between the running speed and output power of the hub dynamo, which is the generator of the bicycle power generation lamp shown in the first embodiment of the present invention.

符号の説明Explanation of symbols

1 発電部
2 整流部
3 白色LED
4 抵抗
5 NPNトランジスタ
6 明るさ検出部
7 制御部
8 PNPトランジスタ
9 バイパス手段
1 Power generation unit 2 Rectification unit 3 White LED
4 Resistance 5 NPN transistor 6 Brightness detection unit 7 Control unit 8 PNP transistor 9 Bypass means

Claims (1)

自転車の走行により発電する発電機を搭載し、発電した電力でLEDを点灯させる自転車用発電ランプであって、前記発電機からの電圧を整流する整流部と、前記LEDの点灯を制御する制御部と、周囲の明るさに応じて前記制御部に信号を出力する明るさ検出部と、前記LEDに直列に接続した抵抗と、前期制御部からの信号により前記LEDをドライブするトランジスタAと、前記LEDと前記抵抗間にベースを接続したトランジスタBと、前記トランジスタBに直列に接続したバイパス手段である抵抗とを備え、前記発電部の電力増加時に前記LEDの電流を検出し規定値以上になると、前記トランジスタBをオンしてバイパス電流を増加させることにより、前記発電部の出力電圧を抑制し、前記LEDへの過電流を防止するように構成された自転車用発電ランプ。 A bicycle power generation lamp that is equipped with a generator that generates electricity by running a bicycle and lights an LED with the generated power, a rectifying unit that rectifies the voltage from the generator, and a control unit that controls lighting of the LED A brightness detection unit that outputs a signal to the control unit according to ambient brightness, a resistor connected in series to the LED, a transistor A that drives the LED by a signal from the previous control unit, A transistor B having a base connected between the LED and the resistor, and a resistor which is a bypass means connected in series to the transistor B, and when the power of the power generation unit is increased, the current of the LED is detected and becomes a specified value or more. The transistor B is turned on to increase the bypass current, thereby suppressing the output voltage of the power generation unit and preventing overcurrent to the LED. It has been bicycle generator lamp.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0752854A (en) * 1993-08-11 1995-02-28 Bridgestone Cycle Co Lighting device for bicycle
JPH07329852A (en) * 1994-06-02 1995-12-19 Mitsuoka Denki Seisakusho:Kk Automatic lighting and illuminating device for bicycle
JP2003212171A (en) * 2002-01-24 2003-07-30 Tsugunori Toyoda Lighting device for bicycle
JP2003230300A (en) * 2002-01-30 2003-08-15 Shimano Inc Voltage clamping circuit of bicycle dynamo
JP2003276666A (en) * 2002-03-27 2003-10-02 Tsugunori Toyoda Lighting device for bicycle
JP2005199906A (en) * 2004-01-16 2005-07-28 Shimano Inc Lighting device for bicycle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0752854A (en) * 1993-08-11 1995-02-28 Bridgestone Cycle Co Lighting device for bicycle
JPH07329852A (en) * 1994-06-02 1995-12-19 Mitsuoka Denki Seisakusho:Kk Automatic lighting and illuminating device for bicycle
JP2003212171A (en) * 2002-01-24 2003-07-30 Tsugunori Toyoda Lighting device for bicycle
JP2003230300A (en) * 2002-01-30 2003-08-15 Shimano Inc Voltage clamping circuit of bicycle dynamo
JP2003276666A (en) * 2002-03-27 2003-10-02 Tsugunori Toyoda Lighting device for bicycle
JP2005199906A (en) * 2004-01-16 2005-07-28 Shimano Inc Lighting device for bicycle

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