JPS60238892A - Level meter circuit - Google Patents

Level meter circuit

Info

Publication number
JPS60238892A
JPS60238892A JP9501284A JP9501284A JPS60238892A JP S60238892 A JPS60238892 A JP S60238892A JP 9501284 A JP9501284 A JP 9501284A JP 9501284 A JP9501284 A JP 9501284A JP S60238892 A JPS60238892 A JP S60238892A
Authority
JP
Japan
Prior art keywords
level meter
zener diode
output terminal
series
leds
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9501284A
Other languages
Japanese (ja)
Other versions
JPH0685106B2 (en
Inventor
田中　吉一
堀　文夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59095012A priority Critical patent/JPH0685106B2/en
Publication of JPS60238892A publication Critical patent/JPS60238892A/en
Publication of JPH0685106B2 publication Critical patent/JPH0685106B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は並列点灯方式のレベルメータＩＣで、発光ダイ
オード（以下ＬＥＤと略記する）を直列点灯させること
ができる低消費電流のレベルメータ回路に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a parallel lighting type level meter IC, and relates to a low current consumption level meter circuit that is capable of lighting light emitting diodes (hereinafter abbreviated as LED) in series. be.

従来例の構成とその問題点 従来並列点灯方式のレベルメータＩＣを用いた場合は当
然のことながら、Ｎ個のＬＥＤを点灯させる時にはＬＥ
Ｄ１個当りに流す電流のＮ倍の電流を必要としていた。Conventional configuration and its problems When using a conventional parallel lighting type level meter IC, it goes without saying that when lighting N LEDs, the LE
A current N times the current flowing per D was required.

第１図は並列点灯方式のレベルメータ回路の一例である
。１６は６点並列点灯方式のレベルメータＸＧであり、
１１はカップリングコンデンサ、１２はバッファ抵抗、
１３と１４はバイアスを決めている抵抗器とコンデンサ
である。１５は入力端子であり入力信号が小から大にな
るにしたがって、６のＬＥＤから７，８゜９．１０の各
ＬＩＣＤが順に点灯する。１．２，３゜４．６は抵抗器
であり、ＬＥＤ６．ＬＥＤ７゜ＬＩＣＤｓ　、ＬＩＣＤ
９　、ＬＩＥＤｌ　０と直列につながれていて流れる電
流を決めている。このような回路においては各々のＬＥ
Ｄと各々の抵抗器の抵抗値が若干違うとしても１個当り
のおよそ６倍の電流が必要となる。これでは電源側に負
担がかかり結局電源側が高価になるという問題点があっ
た。FIG. 1 shows an example of a parallel lighting type level meter circuit. 16 is a 6-point parallel lighting system level meter XG,
11 is a coupling capacitor, 12 is a buffer resistor,
13 and 14 are resistors and capacitors that determine bias. Reference numeral 15 denotes an input terminal, and as the input signal increases from small to large, the LEDs 6 to 7, 8, 9, and 10 light up in sequence. 1.2, 3° 4.6 are resistors, LED 6. LED7゜LICDs, LICD
9, LIEDl is connected in series with 0 and determines the current flowing. In such a circuit, each LE
Even if the resistance values of D and each resistor are slightly different, approximately six times the current is required for each resistor. This poses a problem in that it places a burden on the power supply and ends up making the power supply expensive.

発明の目的 本発明は並列点灯用のレベルメータｒｅを使用しＬＥＤ
を直列点灯させ、低消費電流とし電源部を安価に構成す
ることを目的とする。Purpose of the Invention The present invention uses a level meter re for parallel lighting and
The purpose is to light up the LEDs in series to achieve low current consumption and to configure the power supply unit at low cost.

発明の構成 本発明はツェナーダイオードとＬＥＤとの電圧降下差を
利用し、Ｎ個のＬＥＤを直列に接続し、その接続点と並
列点灯用レベルメータＩＣの出力端子をツェナーダイオ
ードで接続することによって、ＬＫＤｉ直列点灯するこ
とができるようにしたものである。Structure of the Invention The present invention utilizes the voltage drop difference between a Zener diode and an LED, connects N LEDs in series, and connects the connection point of the LEDs to the output terminal of a level meter IC for parallel lighting using a Zener diode. , LKDi can be lit in series.

実施例の説明 第２図は本発明の一実施例の構成図であり、１６は並列
点灯方式のレベルメータＩＣである。１１゜はカップリ
ングのコンデンサ、１２はバッファ抵抗器、１３と１４
はバイアス用の抵抗器とコンデンサである。１５は入力
端子、１７は定電流回路である。２１．２２，２３，２
４，２５はＬＥＤであり直列に接続されており、その各
々の接続点からレベルメータＩＣ１６の出力端子Ａ、出
力端子Ｂ、出力端子Ｃ１出力端子りに対してツェナダイ
オード２６、ツェナーダイオード２７、ツェナーダイオ
ード２８、ツェナーダ・イオード２９で各々接続されて
いる。ＬＥＤ２５の他端は出力端子Ｅに直接接続される
。２６．２７．２８．２９のツェナーダイオードはツェ
ナー電圧が各々違う。DESCRIPTION OF THE EMBODIMENT FIG. 2 is a block diagram of an embodiment of the present invention, and 16 is a parallel lighting type level meter IC. 11° is a coupling capacitor, 12 is a buffer resistor, 13 and 14
are the bias resistor and capacitor. 15 is an input terminal, and 17 is a constant current circuit. 21.22,23,2
4 and 25 are LEDs connected in series, and from their respective connection points to the output terminal A, output terminal B, and output terminal C1 of the level meter IC 16, a Zener diode 26, a Zener diode 27, and a Zener diode are connected. They are connected through a diode 28 and a Zener diode 29, respectively. The other end of the LED 25 is directly connected to the output terminal E. The Zener diodes 26, 27, 28, and 29 have different Zener voltages.

ＬＥＤＯ順方向電圧降下を２．３〜２．６ｖとすると３
Ｖ＜らいの違いに設定する。第２図の実施例においては
、ツェナーダイオード２９はツェナー電圧を３Ｖ、ツェ
ナダイオード２８［６Ｖ、ツェナーダイオード２γは９
Ｖ、ツェナーダイオード２６は１２Ｖに設定する。If the LEDO forward voltage drop is 2.3 to 2.6v, then 3
Set to a difference of V< leprosy. In the embodiment of FIG. 2, the Zener diode 29 has a Zener voltage of 3V, the Zener diode 28 has a Zener voltage of 6V, and the Zener diode 2γ has a voltage of 9V.
V, and the Zener diode 26 is set to 12V.

今入力端子１５に入力信号が入ってきて、出力端子Ａ、
出力端子Ｂ、出力端子Ｃ１出カ端子りの順に各出力端子
がオンになるとする。出力端子ＡがオンするとＬＥＤ２
１Ｑツェナーダイオード２６を介して電流が流れ点灯す
る。次に出力端子Ｂもオンするとツェナーダイオード２
７のツェナー電圧とＬＥＤ２２の順方向電圧の和がツェ
ナーダイオード２６のツェナー電圧よりも低くなってし
まう為、出力端子Ａには電流が流れず出力端子Ｂにだけ
電流が流れＬＩＣＤ２１とＬＩＣＤ２２が点灯すること
になる。順次これをくり返して、６個のＬＥＤが全て点
灯している時は出力端子Ｅにだけ電流は流れている。こ
のように並列点灯用のレベルメータＩＣｉ使用していな
がら、使用する電流ＱＬＫＤ１個分でよいことになる。Now, an input signal is input to input terminal 15, output terminal A,
It is assumed that each output terminal is turned on in the order of output terminal B and output terminal C1. When output terminal A is turned on, LED2
Current flows through the 1Q Zener diode 26 and lights up. Next, when output terminal B is also turned on, Zener diode 2
Since the sum of the Zener voltage of 7 and the forward voltage of LED 22 is lower than the Zener voltage of Zener diode 26, current does not flow to output terminal A but only to output terminal B, causing LICD 21 and LICD 22 to light up. It turns out. This is repeated one after another, and when all six LEDs are lit, current is flowing only to the output terminal E. In this way, even though the level meter ICi for parallel lighting is used, only one current QLKD is required.

すなわちＮ個のＬＥＤを並列点灯させた時の１／Ｎの消
費電流となる。尚、第２図にはＬＥＤが１列だけの実施
例を示したが、ステレオなどのようにＬＥＤが２列に配
設される場合にはさらに有効な低消費電流のレベルメー
タ回路が実現できる。In other words, the current consumption is 1/N when N LEDs are lit in parallel. Although Fig. 2 shows an example in which there is only one row of LEDs, if the LEDs are arranged in two rows, such as in a stereo, an even more effective level meter circuit with low current consumption can be realized. .

発明の効果 本発明によれば、並列点灯用のレベルメータエＣを用い
てＬＥＤ列を直列点灯させることができ、消費電流を数
分の１に減らすことが可能で、電源部を安価に構成でき
るようになり、その工業的な価値の犬なるものである。Effects of the Invention According to the present invention, LED strings can be lit in series using the level meter E C for parallel lighting, the current consumption can be reduced to a fraction, and the power supply section can be configured at low cost. It has become a dog of industrial value.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の並列点灯方式によるレベルメータ回路の
構成図、第２図は本考案の一実施例の構成図である。 １６・・・・・並列点灯用レベルメータＩＣ，１７・・
・・・・定電流回路、２１．２２，２３，２４．２５・
・・・・・ＬＥＤ、２６．２７．２８．２９・・・・・
ツェナーダイオード。FIG. 1 is a block diagram of a level meter circuit using a conventional parallel lighting system, and FIG. 2 is a block diagram of an embodiment of the present invention. 16... Level meter IC for parallel lighting, 17...
... Constant current circuit, 21.22, 23, 24.25.
...LED, 26.27.28.29...
zener diode.

Claims (1)

【特許請求の範囲】[Claims] Ｎ個の発光ダイオードを駆動できる並列点灯用レベルメ
ータＩＣと直列に接続したＮ個の発光ダイオードとを備
え、発光ダイオードの（Ｎ−ｍ）イ固目と（Ｎ−ｍ−１
）個目Ｃ（ｍは０からＮ−２まで）〕との接続点と、前
記レベルメータ用ＩＣの第ｍ＋１番目の出力端子をツェ
ナーダイオードで接続し、ツェナーダイオードと発光ダ
イオードの電圧降下差を利用して発光ダイオードを直列
点灯するように構成したことを特徴とするレベルメータ
回路。Equipped with a level meter IC for parallel lighting that can drive N light emitting diodes and N light emitting diodes connected in series,
) C (m is from 0 to N-2)] and the m+1st output terminal of the level meter IC are connected with a Zener diode, and the voltage drop difference between the Zener diode and the light emitting diode is calculated. 1. A level meter circuit characterized in that the level meter circuit is configured so that light emitting diodes are lit in series.
JP59095012A 1984-05-11 1984-05-11 Level meter circuit Expired - Lifetime JPH0685106B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59095012A JPH0685106B2 (en) 1984-05-11 1984-05-11 Level meter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59095012A JPH0685106B2 (en) 1984-05-11 1984-05-11 Level meter circuit

Publications (2)

Publication Number Publication Date
JPS60238892A true JPS60238892A (en) 1985-11-27
JPH0685106B2 JPH0685106B2 (en) 1994-10-26

Family

ID=14126050

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59095012A Expired - Lifetime JPH0685106B2 (en) 1984-05-11 1984-05-11 Level meter circuit

Country Status (1)

Country Link
JP (1) JPH0685106B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003109157A (en) * 2001-09-27 2003-04-11 Aiphone Co Ltd House monitoring system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54134596A (en) * 1978-04-11 1979-10-19 Mitsubishi Electric Corp Display circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54134596A (en) * 1978-04-11 1979-10-19 Mitsubishi Electric Corp Display circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003109157A (en) * 2001-09-27 2003-04-11 Aiphone Co Ltd House monitoring system

Also Published As

Publication number Publication date
JPH0685106B2 (en) 1994-10-26

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