JP2018182109A - Ultraviolet led driving device - Google Patents

Ultraviolet led driving device Download PDF

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JP2018182109A
JP2018182109A JP2017080962A JP2017080962A JP2018182109A JP 2018182109 A JP2018182109 A JP 2018182109A JP 2017080962 A JP2017080962 A JP 2017080962A JP 2017080962 A JP2017080962 A JP 2017080962A JP 2018182109 A JP2018182109 A JP 2018182109A
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ultraviolet
ultraviolet led
light source
led light
reference voltage
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中山　猛
Takeshi Nakayama
猛 中山
敏夫 山口
Toshio Yamaguchi
敏夫 山口
晃史 所
Akinori Tokoro
晃史 所
博司 小泉
Hiroshi Koizumi
博司 小泉
恵美子 尾上
Emiko Onoe
恵美子 尾上
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Un Deccant Co Ltd
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Un Deccant Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an ultraviolet LED driving device capable of obtaining an ultraviolet of a stable intensity.SOLUTION: An ultraviolet LED driving device comprises: an ultraviolet LED light source 11; an ultraviolet photodiode 12; a differential amplification device 15; and a reference voltage source 14. The ultraviolet photodiode 12 converts a light output from the ultraviolet LED light source 11 into an electric signal, and supplies to the differential amplification device 15. The differential amplification device 15 compares the electric signal converted with a reference voltage from the reference voltage source 14, and supplies a driving current to the ultraviolet LED light source 11 so that the light output from the ultraviolet LED light source 11 becomes constant.SELECTED DRAWING: Figure 1

Description

本発明は、紫外線ＬＥＤ駆動装置に関する。   The present invention relates to an ultraviolet LED driver.

近時、紫外線の光源として紫外線ＬＥＤが提示されている。従来から紫外線の光源として用いられていた水銀ランプとの対比で、紫外線ＬＥＤは種々の利点を有する。具体的には、紫外線ＬＥＤはスペクトルの比較的狭い波長の発光が可能であり、光学フィルターを要さずとも、特定波長に限定した出射パワーを一定に制御しやすい。紫外線ＬＥＤでは、水銀ランプにとって必要な大掛かりな制御装置は不要であり、低エネルギーで駆動可能である。実使用域において、紫外線ＬＥＤでは、出力する紫外線の強度について温度依存性が小さく、強度の制御が容易である。紫外線ＬＥＤでは入力する電流と出力する紫外線の強度とが概ね比例関係にあり、所望の強度の紫外線を得ることが容易である。   Recently, ultraviolet LEDs have been proposed as a light source of ultraviolet light. In contrast to mercury lamps, which are conventionally used as UV light sources, UV LEDs have various advantages. Specifically, the ultraviolet LED can emit light having a relatively narrow wavelength of the spectrum, and it is easy to control the output power limited to a specific wavelength at a constant level without the need for an optical filter. The ultraviolet LED does not require a large-scale control device required for the mercury lamp, and can be driven with low energy. In the practical use area, in the ultraviolet LED, the temperature dependence of the intensity of the outputted ultraviolet is small, and the control of the intensity is easy. In the ultraviolet LED, the current to be input and the intensity of the ultraviolet ray to be output are in a substantially proportional relationship, and it is easy to obtain the ultraviolet ray having a desired intensity.

紫外線ＬＥＤは上述のような優れた特性を有するが、その応用範囲を広げるためには、出力される紫外線の強度を精密に制御することが好ましい。例えば、殺菌用途に紫外線ＬＥＤを用いる場合に、紫外線の強度が安定していれば、殺菌の程度は紫外線の照射時間をコントロールすればよいことになる。そのためには、紫外線ＬＥＤへ入力する電流値を安定化させることが重要である。本発明は、安定した強度の紫外線を得るこことができる紫外線ＬＥＤ駆動装置の提供を目的とする。   Although the ultraviolet LED has the excellent characteristics as described above, in order to widen the application range, it is preferable to precisely control the intensity of the outputted ultraviolet. For example, in the case of using an ultraviolet LED for sterilization, if the intensity of the ultraviolet light is stable, the degree of sterilization may be controlled by controlling the irradiation time of the ultraviolet light. For that purpose, it is important to stabilize the current value input to the ultraviolet LED. An object of the present invention is to provide an ultraviolet LED drive device capable of obtaining ultraviolet light of stable intensity.

本発明者らが鋭意検討した結果、以下のような本発明を完成した。
（１）紫外線ＬＥＤ光源と、紫外線ホトダイオードと、差動増幅デバイスと、基準電圧源と、を備え、紫外線ホトダイオードが紫外線ＬＥＤ光源からの光出力を電気信号に変換してモニタ光出力電圧として差動増幅デバイスへ供給し、差動増幅デバイスが、モニタ光出力電圧と基準電圧源からの基準電圧とを比較して、紫外線ＬＥＤ光源からの光出力が一定になるように紫外線ＬＥＤ光源に駆動電流を供給するよう構成されている、紫外線ＬＥＤ駆動装置。
（２）紫外線ＬＥＤ光源に対するサージ保護回路をさらに有する（１）の紫外線ＬＥＤ駆動装置。
（３）紫外線ＬＥＤ光源が波長２５０〜３１０ｎｍの紫外線を出力する（１）又は（２）の紫外線ＬＥＤ駆動装置。
（４）紫外線ＬＥＤ光源からの光出力が殺菌目的で使用される（１）〜（３）の紫外線ＬＥＤ駆動装置。 As a result of intensive studies by the present inventors, the present invention as described below has been completed.
(1) An ultraviolet LED light source, an ultraviolet photodiode, a differential amplification device, and a reference voltage source are provided, and the ultraviolet photodiode converts the light output from the ultraviolet LED light source into an electrical signal to be differential as a monitor light output voltage The amplification device is supplied, and the differential amplification device compares the monitor light output voltage with the reference voltage from the reference voltage source to drive the UV LED light source so that the light output from the ultraviolet LED light source becomes constant. An ultraviolet LED driver, which is configured to supply.
(2) The ultraviolet LED drive device according to (1), further including a surge protection circuit for the ultraviolet LED light source.
(3) The ultraviolet LED drive device according to (1) or (2), wherein the ultraviolet LED light source outputs ultraviolet light having a wavelength of 250 to 310 nm.
(4) The ultraviolet LED drive device of (1) to (3) in which the light output from the ultraviolet LED light source is used for sterilization purpose.

本発明によれば、ＡＰＣ回路の利用により、紫外線ＬＥＤ光源から出力される紫外線の強度を安定させることができる。   According to the present invention, it is possible to stabilize the intensity of the ultraviolet light output from the ultraviolet LED light source by using the APC circuit.

本発明の紫外線ＬＥＤ駆動装置の一例の動作原理を表すブロック図である。It is a block diagram showing the operation principle of an example of the ultraviolet LED drive of the present invention. 本発明の紫外線ＬＥＤ駆動装置の回路例である。It is a circuit example of the ultraviolet-ray LED drive device of this invention. 本発明の紫外線ＬＥＤ駆動装置の他の回路例である。It is another circuit example of the ultraviolet LED drive device of this invention.

以下、図面を適宜参照しながら本発明を説明する。本発明は、図示された態様に限定されるわけではない。   Hereinafter, the present invention will be described with reference to the drawings as appropriate. The invention is not limited to the illustrated embodiment.

図１は、本発明の紫外線ＬＥＤ駆動装置の一例の動作原理を表すブロック図である。本発明ではＡＰＣ（Ａｕｔｏｍａｔｉｃ Ｐｏｗｅｒ Ｃｏｎｔｒｏｌ）回路とよばれる回路を用いる。紫外線ＬＥＤ光源１１から紫外線が出力される。本発明では、出力された紫外線を「光」とも記載する。紫外線の出力を図１では矢印１１１及び矢印１１２で描写している。主として、矢印１１１で表される紫外線は紫外線照射の本来の目的のために用いられる。例えば、矢印１１１で表される紫外線を殺菌対象物に照射することにより、当該対象物を殺菌することができる。本発明では、紫外線照射の目的は特に限定されない。   FIG. 1 is a block diagram showing the operation principle of an example of the ultraviolet LED drive device of the present invention. In the present invention, a circuit called an APC (Automatic Power Control) circuit is used. Ultraviolet light is output from the ultraviolet LED light source 11. In the present invention, the output ultraviolet light is also referred to as "light". The output of ultraviolet light is depicted in FIG. 1 by arrows 111 and 112. Primarily, the UV radiation represented by arrows 111 is used for the original purpose of UV radiation. For example, the object can be sterilized by irradiating the sterilization object with the ultraviolet light represented by the arrow 111. In the present invention, the purpose of the ultraviolet irradiation is not particularly limited.

紫外線ＬＥＤ光源から出力される紫外線の一部は矢印１１２で示されるように、紫外線ホトダイオード１２へと向けられる。紫外線ホトダイオード１２は、紫外線ＬＥＤ光源１１から出力された紫外線（矢印１１２）をモニターして、その強度に応じた電気信号を得ることができる。そのようにして得られた電気信号をモニタ光出力電圧１３として用いる。   A portion of the ultraviolet light output from the ultraviolet LED light source is directed to the ultraviolet photodiode 12 as indicated by arrow 112. The ultraviolet photodiode 12 can monitor the ultraviolet light (arrow 112) output from the ultraviolet LED light source 11 to obtain an electrical signal according to the intensity. The electrical signal thus obtained is used as the monitor light output voltage 13.

モニタ光出力電圧１３は、差動増幅デバイス１５に送られる。差動増幅デバイス１５には基準電圧源からの基準電圧１４が送られる。差動増幅デバイス１５ではモニタ光出力電圧１３と基準電圧１５とが比較され、所定の電流を出力して、必要に応じて増幅器１６を経て、紫外線ＬＥＤ光源１１の駆動電流として供給される。このとき、差動増幅デバイス１５は、紫外線ＬＥＤ光源からの紫外線の照射が一定になるように調整される。例えば、何らかの原因により光出力が上がった場合には、上昇した光出力を紫外線ホトダイオード１２が検知して、紫外線ＬＥＤ光源１１への駆動電流を少なくなるように構成されている。また、何らかの原因により光出力が下がった場合には、下落した光出力を紫外線ホトダイオード１２が検知して、紫外線ＬＥＤ光源１１への駆動電流を多くするように構成されている。光出力の増減は、紫外線ホトダイオード１２による光電変換を介して、モニタ光出力電圧１３の増減として表現される。差動増幅デバイス１５では、増減するモニタ光出力電圧１３と、基準となる基準電圧１４との電圧差が一定となるように動作するため、結果的に、紫外線ＬＥＤ光源１１からの光出力の変動が回路によってフィードバックされて、その変動が小さくなるように制御される。このようなフィードバックが作動することを、本発明では、「紫外線ＬＥＤ光源からの光出力が一定になるように紫外線ＬＥＤ光源に駆動電流を供給するよう構成されている」と表現している。したがって、何らかの理由で光出力が厳密な意味で一定化していないとしても、差動増幅デバイス１５によるフィードバックが作動していれ、本発明の実施がなされていると解することができる。   The monitor light output voltage 13 is sent to the differential amplification device 15. The reference voltage 14 from the reference voltage source is sent to the differential amplification device 15. In the differential amplification device 15, the monitor light output voltage 13 and the reference voltage 15 are compared, and a predetermined current is output and supplied as a drive current of the ultraviolet LED light source 11 through the amplifier 16 as necessary. At this time, the differential amplification device 15 is adjusted so that the irradiation of the ultraviolet light from the ultraviolet LED light source becomes constant. For example, when the light output is increased for some reason, the ultraviolet photodiode 12 detects the increased light output, and the drive current to the ultraviolet LED light source 11 is reduced. Further, when the light output is lowered for some reason, the ultraviolet photodiode 12 detects the lowered light output, and the drive current to the ultraviolet LED light source 11 is increased. The increase or decrease of the light output is expressed as the increase or decrease of the monitor light output voltage 13 through photoelectric conversion by the ultraviolet photodiode 12. The differential amplification device 15 operates so that the voltage difference between the monitor light output voltage 13 that increases and decreases and the reference voltage 14 serving as the reference becomes constant, and as a result, the fluctuation of the light output from the ultraviolet LED light source 11 Are fed back by the circuit and controlled to reduce their fluctuations. The operation of such feedback is expressed in the present invention as "being configured to supply drive current to the ultraviolet LED light source so that the light output from the ultraviolet LED light source becomes constant." Therefore, even if the light output is not constant in a strict sense for some reason, it can be understood that the feedback by the differential amplification device 15 is activated, and the present invention is implemented.

このようなＡＰＣ回路の利用により、紫外線ＬＥＤ光源１１から出力される紫外線の強度を安定させることができる。   By using such an APC circuit, the intensity of the ultraviolet light output from the ultraviolet LED light source 11 can be stabilized.

紫外線ＬＥＤ光源は、好ましくは、波長２５０〜３１０ｎｍの紫外線を照射し得るものが選択される。そのような紫外線を照射し得る紫外線ＬＥＤ光源として、各種窒化物半導体などが挙げられるほか、ＬＥＤ製造技術を適宜参照することができ、さらには、市販品（例えば、日機装株式会社製、日亜化学株式会社製）などを用いることができる。   The ultraviolet LED light source is preferably selected to be capable of irradiating ultraviolet light having a wavelength of 250 to 310 nm. As an ultraviolet LED light source capable of irradiating such ultraviolet rays, various nitride semiconductors and the like can be mentioned, and LED manufacturing technology can be appropriately referred to, and further, commercially available products (for example, Nichia Chemical Co., Ltd., manufactured by Nikkiso Co., Ltd.) And the like.

水銀ランプとは異なり、紫外線ＬＥＤは、ウォーミングアップの時間を要さずに低い動作電圧で作動し、点灯と消灯との切替えを瞬時に行うことができ、長寿命である。紫外線ＬＥＤ光源は、水銀ランプとは異なり、実使用温度域、例えば、マイナス１０℃から６０℃程度の温度域において、照射される紫外線強度の温度依存性が小さいので、照射の総量を見積もることが容易である。具体的には、照射時間を設定することにより、照射される紫外線の総量が精度よく算出されるので、例えば、殺菌用途に用いる場合には照射時間を管理すればよいことになる。その際に、本発明の技術を適用して、出射光量を一定に保つことが重要となる。   Unlike a mercury lamp, an ultraviolet LED operates at a low operating voltage without requiring a warm-up time, can be switched on and off instantaneously, and has a long life. Unlike the mercury lamp, the ultraviolet LED light source has a small temperature dependency of the intensity of the irradiated ultraviolet light in the actual use temperature range, for example, a temperature range of about -10 ° C to about 60 ° C, so the total amount of irradiation can be estimated. It is easy. Specifically, by setting the irradiation time, the total amount of the ultraviolet rays to be irradiated can be accurately calculated. Therefore, for example, when used for sterilization, the irradiation time may be managed. At that time, it is important to keep the emitted light quantity constant by applying the technology of the present invention.

紫外線ホトダイオードは、紫外線ＬＥＤ光源から得ようとする波長の紫外線を受光して光電変換し得るデバイスである。典型的には、各種窒化物半導体などが挙げられるほか、ホトダイオード製造技術を適宜参照することができ、さらには、市販品（例えば、日機装株式会社製、日亜化学株式会社製）などを用いることができる。   The ultraviolet photodiode is a device capable of receiving and photoelectrically converting ultraviolet light of a wavelength to be obtained from the ultraviolet LED light source. Typically, various nitride semiconductors and the like can be mentioned, and photodiode manufacturing technology can be referred to appropriately, and further, commercially available products (for example, Nikkiso Co., Ltd., Nichia Chemical Co., Ltd.) and the like can be used. Can.

ＡＰＣ回路の具体的構成は従来技術を適宜参照することができる。図２は、本発明の紫外線ＬＥＤ駆動装置の回路例である。紫外線ＬＥＤ光源２１からの出力光の一部が紫外線ホトダイオード２２で光電変換され、モニタ光出力電圧として差動増幅デバイス２５へ送られる。符号２３は紫外線ホトダイオード２２における光電変換及びモニタ光出力電圧を生成する回路である。差動増幅デバイス２５へは、符号２４の回路で生成された基準電圧も送られる。差動増幅デバイス２５では、モニタ光出力電圧と基準電圧とが比較され、紫外線ＬＥＤ光源２１からの紫外線の照射が一定になるように、紫外線ＬＥＤ光源２１へと駆動電流が出力される。   The specific configuration of the APC circuit can be appropriately referred to the prior art. FIG. 2 is a circuit example of the ultraviolet LED drive device of the present invention. A part of the output light from the ultraviolet LED light source 21 is photoelectrically converted by the ultraviolet photodiode 22 and sent to the differential amplification device 25 as a monitor light output voltage. Reference numeral 23 is a circuit for generating a photoelectric conversion and monitor light output voltage in the ultraviolet photodiode 22. The reference voltage generated by the circuit of reference numeral 24 is also sent to the differential amplification device 25. In the differential amplification device 25, the monitor light output voltage and the reference voltage are compared, and a drive current is output to the ultraviolet LED light source 21 so that the irradiation of the ultraviolet light from the ultraviolet LED light source 21 becomes constant.

図２の形態では、差動増幅デバイス２５はトランジスタを用いて構成されている。差動増幅デバイスはオペアンプ等を用いたＩＣ化によって実現してもよい。差動増幅デバイスの具体的な構成については、電気回路の制御技術を適宜参照することができる。   In the embodiment of FIG. 2, the differential amplification device 25 is configured using a transistor. The differential amplification device may be realized by IC implementation using an operational amplifier or the like. For a specific configuration of the differential amplification device, reference can be made to control technology of an electric circuit as appropriate.

符号２６は紫外線ＬＥＤ光源への駆動電流を供給する回路である。符号２６の回路には、コンデンサとコイルを利用するサージ保護回路も含まれている。紫外線ＬＥＤ光源は静電気に対して非常に敏感であり、また、１ＧＨｚ以上の高速応答性をもつ。紫外線ＬＥＤ光源の動作電圧は低く、６〜７Ｖ程度である。これらのことから、紫外線ＬＥＤ光源はサージ電流に対して弱いので、符号２６の回路のように、サージ電流防止のためのサージ保護回路が含まれることが好ましい。当該サージ保護回路はＥＳＤ（静電）対策としても役立つ。   Reference numeral 26 is a circuit for supplying a drive current to the ultraviolet LED light source. The circuit 26 also includes a surge protection circuit that utilizes a capacitor and a coil. Ultraviolet LED light sources are very sensitive to static electricity and have high speed response above 1 GHz. The operating voltage of the ultraviolet LED light source is low, about 6 to 7V. From these facts, it is preferable to include a surge protection circuit for preventing a surge current as in the circuit 26 since the ultraviolet LED light source is weak against the surge current. The surge protection circuit also serves as ESD (electrostatic) protection.

図３は、本発明の紫外線ＬＥＤ駆動装置の他の回路例である。図２の回路と対比すると、図３の回路ではサージ保護回路が省略されている。このような回路の使用もまた本発明の実施の一形態である。   FIG. 3 is another circuit example of the ultraviolet LED drive device of the present invention. In contrast to the circuit of FIG. 2, the surge protection circuit is omitted in the circuit of FIG. The use of such circuits is also an embodiment of the present invention.

本発明の紫外線ＬＥＤ駆動装置の用途は特に限定は無く、紫外線を適用する各種分野への応用が可能である。例えば、紫外線を殺菌のために用いる際に、本発明の紫外線ＬＥＤ駆動装置を用いてもよい。具体的には、例えば、本発明の紫外線ＬＥＤ駆動装置を箱等に格納し、当該箱にて殺菌対象物に紫外線を照射することが提案される。本発明では、細菌等の微生物を死滅させる意味で「殺菌」の語を用いるが、対象とする微生物の種類や死滅の程度は特に限定しない。殺菌対象物は特に限定は無く、具体例としては、例えば、医療や介護の現場で用いる各種器具、例えば、医療器具や介護用品などが挙げられる。   The application of the ultraviolet LED drive device of the present invention is not particularly limited, and application to various fields to which ultraviolet light is applied is possible. For example, when using ultraviolet light for sterilization, the ultraviolet LED driving device of the present invention may be used. Specifically, for example, it is proposed that the ultraviolet LED drive device of the present invention be stored in a box or the like, and the sterilization target be irradiated with ultraviolet light in the box. In the present invention, the term "killing" is used in the sense of killing microorganisms such as bacteria, but the type of the target microorganism and the degree of killing are not particularly limited. There are no particular limitations on the sterilization target, and specific examples include various instruments used in medical and nursing care, such as medical instruments and care products.

１１・２１・３１ 紫外線ＬＥＤ光源、
１２・２２・３２ 紫外線ホトダイオード、
１３ モニタ光出力電圧、１４ 基準電圧、１５・２５ 差動増幅デバイス 11, 21, 31 UV LED light source,
12 · 22 · 32 UV photodiode,
13 monitor optical output voltage, 14 reference voltage, 15 25 differential amplification device

Claims (4)

紫外線ＬＥＤ光源と、紫外線ホトダイオードと、差動増幅デバイスと、基準電圧源と、を備え、
紫外線ホトダイオードが紫外線ＬＥＤ光源からの光出力を電気信号に変換して差動増幅デバイスへ供給し、
差動増幅デバイスが、上記変換された電気信号と基準電圧源からの基準電圧とを比較して、紫外線ＬＥＤ光源からの光出力が一定になるように紫外線ＬＥＤ光源に駆動電流を供給するよう構成されている、
紫外線ＬＥＤ駆動装置。 UV LED light source, UV photodiode, differential amplification device, and reference voltage source,
An ultraviolet photodiode converts the light output from the ultraviolet LED light source into an electrical signal and supplies it to the differential amplifier device,
A differential amplification device is configured to provide a drive current to the ultraviolet LED light source such that the light output from the ultraviolet LED light source becomes constant by comparing the converted electrical signal with the reference voltage from the reference voltage source. Being
Ultraviolet LED drive device. 紫外線ＬＥＤ光源に対するサージ保護回路をさらに有する請求項１記載の紫外線ＬＥＤ駆動装置。   The ultraviolet LED drive device according to claim 1, further comprising a surge protection circuit for the ultraviolet LED light source. 紫外線ＬＥＤ光源が波長２５０〜３１０ｎｍの紫外線を出力する請求項１又は２記載の紫外線ＬＥＤ駆動装置。   The ultraviolet LED drive device according to claim 1 or 2, wherein the ultraviolet LED light source outputs ultraviolet light having a wavelength of 250 to 310 nm. 紫外線ＬＥＤ光源からの光出力が殺菌目的で使用される請求項１〜３のいずれか１項記載の紫外線ＬＥＤ駆動装置。   4. A UV LED drive as claimed in any one of the preceding claims, wherein the light output from the UV LED light source is used for sterilization purposes.
JP2017080962A 2017-04-14 2017-04-14 Ultraviolet led driving device Pending JP2018182109A (en)

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