JP2014157784A5

JP2014157784A5 -

Info

Publication number: JP2014157784A5
Application number: JP2013029258A
Authority: JP
Filing date: 2013-02-18
Publication date: 2016-03-10
Anticipated expiration: 2033-02-18

Description

本発明は、ＬＥＤ（発光ダイオード）または有機ＥＬ（Ｅｌｅｃｔｒｏ−ｌｕｍｉｎｅｓｃｅｎｃｅ）を調光点灯する光源点灯装置および照明装置に関するものである。 The present invention relates to a light source lighting device and a lighting device for dimming and lighting an LED (light emitting diode) or an organic EL (Electro - Luminescence).

従来提案されている点灯装置は、例えば特許文献１に記載されているように、発光デバイスに対する輝度調整用のＰＷＭ（ＰｕｌｓｅＷｉｄｔｈＭｏｄｕｌａｔｉｏｎ：パルス幅変調）信号を外部から入力する。このＰＷＭ信号をマイコン等の制御回路で所定時間測定することにより、ＰＷＭ信号のデューティ比を算出する。そのデューティ比を変えることなく、ＰＷＭ信号のキャリア周波数を発光デバイスの動作に最適なキャリア周波数に合わせた新たなＰＷＭ信号を、再生成するようにしている。 A conventionally proposed lighting device is, for example, as described in Patent Document 1, a PWM (Pulse) for brightness adjustment for a light emitting device. Width Modulation (pulse width modulation) signal is input from the outside. The PWM signal is measured for a predetermined time by a control circuit such as a microcomputer to calculate the duty ratio of the PWM signal. Without changing the duty ratio, a new PWM signal in which the carrier frequency of the PWM signal is adjusted to the optimum carrier frequency for the operation of the light emitting device is regenerated.

本発明にかかる光源点灯装置は、
光源が接続される出力端を有する点灯回路と、
前記光源の光量を調整するための第１ＰＷＭ信号が入力され、前記第１ＰＷＭ信号に従って第２ＰＷＭ信号を生成する調光回路と、
前記第２ＰＷＭ信号の入力を受けるとともに、前記点灯回路に対して調光点灯制御のための信号を出力する制御回路と、
を備え、
前記制御回路は、前記第２ＰＷＭ信号のオン期間とオフ期間の少なくとも一方を計測し、前記第２ＰＷＭ信号のデューティ比を前記第１ＰＷＭ信号のデューティ比に近づけるように前記第２ＰＷＭ信号のオン期間およびオフ期間に補正値を加算または減算した第３ＰＷＭ信号に基づいて前記点灯回路に信号を出力することを特徴とする。 The light source lighting device according to the present invention is
A lighting circuit having an output end to which a light source is connected;
The PW M No. signal for adjusting the light quantity of the light source is inputted, a dimming circuit for generating a first 2PWM signal according to the first 1PWM signal,
A control circuit that receives the input of the second PWM signal and outputs a signal for dimming lighting control to the lighting circuit;
With
The control circuit measures at least one of an ON period and an OFF period of the second PWM signal, and an ON period and an OFF period of the second PWM signal so that the duty ratio of the second PWM signal approaches the duty ratio of the first PWM signal. A signal is output to the lighting circuit based on a third PWM signal obtained by adding or subtracting a correction value to the period.

図２（Ｂ）は、制御回路４に入力される第２ＰＷＭ信号の波形である。制御回路４では、調光回路３のフォトカプラＰＣやＭＯＳ−ＦＥＴＱ１のターンオン時間とターンオフ時間が異なる場合などは、調光回路３に入力される第１ＰＷＭ信号のオンデューティ比と、制御回路４に入力される第２ＰＷＭ信号のオンデューティ比が異なってしまう。その結果、図２（Ｂ）に示す制御回路４に入力される第２ＰＷＭ信号が、オン期間ａ´が０．４ｍｓ、オフ期間ｂ´が０．６ｍｓとなっている。 FIG. 2B shows the waveform of the second PWM signal input to the control circuit 4. In the control circuit 4, when the turn-on time and the turn-off time of the photocoupler PC or the MOS-FET Q1 of the dimming circuit 3 are different, the on-duty ratio of the first PWM signal input to the dimming circuit 3 and the control circuit 4 The on-duty ratio of the second PWM signal input to the signal is different. As a result, the second PWM signal input to the control circuit 4 shown in FIG. 2B has an on period a ′ of 0.4 ms and an off period b ′ of 0.6 ms.

実施の形態２では、外部端子２１を介して入力端子２０へと外部からＨｉｇｈ信号が入力されると、計測部９が、調光回路３から出力された第２ＰＷＭ信号のオン期間とオフ期間を計測する。演算部１０は、前記計測したオン期間とオフ期間に対して、記憶部８に予め格納した補正値を加減して、オン・デューティを算出する。制御回路４は、この算出したオン・デューティ比に応じて点灯回路２の点灯制御部５へ信号を出力する。 In the second embodiment, when a high signal is input from the outside to the input terminal 20 via the external terminal 21, the measuring unit 9 causes the on period and the off period of the second PWM signal output from the dimming circuit 3. Measure. The calculation unit 10 calculates an on-duty by adding or subtracting a correction value stored in advance in the storage unit 8 to the measured on period and off period. The control circuit 4 outputs a signal to the lighting control unit 5 of the lighting circuit 2 according to the calculated on-duty ratio.

計測部９は、入力端子２０にＬｏｗ信号が入力されたことを検知した際は、制御回路４に入力される第２ＰＷＭ信号のオン期間を計測する。演算部１０は、計測したオン期間ａ´＝０．４ｍｓから予め指定されたオン期間ａ＝０．３ｍｓの差分である０．１ｍｓを補正値として算出し、これを記憶部８に格納する。 When the measurement unit 9 detects that the Low signal is input to the input terminal 20, the measurement unit 9 measures the ON period of the second PWM signal input to the control circuit 4. The calculation unit 10 calculates 0.1 ms, which is a difference between the measured on-period a ′ = 0.4 ms and a predetermined on-period a = 0.3 ms, as a correction value, and stores the correction value in the storage unit 8.

しかしながら、調光回路３のフォトカプラＰＣやＭＯＳ−ＦＥＴＱ１のターンオン時間とターンオフ時間などは、部品のばらつきにより異なるため、補正値についても部品毎に異なる値に設定する必要がある。
また、制御回路４でサンプリングする分解能などにより、調光回路３に入力される第１ＰＷＭ信号のオンデューティが一定であっても、制御回路４で計測した第２ＰＷＭ信号のオンデューティは一定とならない場合がある。 However, since the turn-on time and turn-off time of the photocoupler PC and the MOS-FET Q1 of the dimming circuit 3 differ depending on component variations, it is necessary to set different correction values for each component.
In addition, the on-duty of the second PWM signal measured by the control circuit 4 does not become constant even if the on-duty of the first PWM signal input to the dimming circuit 3 is constant due to the resolution sampled by the control circuit 4 or the like. There is.

図５（Ｄ）は、制御回路４で第２ＰＷＭ信号を補正することで生成した第３ＰＷＭ信号の波形である。
計測部９は、入力端子２０にＨｉｇｈ信号が入力されているとき（期間Ｔ_Ｈｉｇｈ）は、制御回路４に入力される第２ＰＷＭ信号のオン期間およびオフ期間を計測する。演算部１０は、計測部９で計測したオン期間ａ´である０．４ｍｓに対しては、記憶部８に格納した補正値０．１ｍｓを減算する。演算部１０は、計測部９で計測したオフ期間ｂ´である０．６ｍｓに対しては、記憶部８に格納した補正値０．１ｍｓを加算する。これにより、第２ＰＷＭ信号を補正し生成した第３ＰＷＭ信号のオン期間ａ´´は０．３ｍｓ、オフ期間ｂ´´は０．７ｍｓとなる。

FIG. 5D shows the waveform of the third PWM signal generated by correcting the second PWM signal by the control circuit 4.
When the High signal is input to the input terminal 20 (period T _High ), the measurement unit 9 measures the ON period and the OFF period of the second PWM signal input to the control circuit 4. The calculation unit 10 subtracts the correction value 0.1 ms stored in the storage unit 8 from 0.4 ms that is the on period a ′ measured by the measurement unit 9. The calculation unit 10 adds the correction value 0.1 ms stored in the storage unit 8 to 0.6 ms that is the off period b ′ measured by the measurement unit 9. As a result, the ON period a ″ of the third PWM signal generated by correcting the second PWM signal is 0.3 ms, and the OFF period b ″ is 0.7 ms.

Claims

A lighting circuit having an output end to which a light source is connected;
The PW M No. signal for adjusting the light quantity of the light source is inputted, a dimming circuit for generating a first 2PWM signal according to the first 1PWM signal,
A control circuit that receives the input of the second PWM signal and outputs a signal for dimming lighting control to the lighting circuit;
With
The control circuit measures at least one of an ON period and an OFF period of the second PWM signal, and an ON period and an OFF period of the second PWM signal so that the duty ratio of the second PWM signal approaches the duty ratio of the first PWM signal. A light source lighting device that outputs a signal to the lighting circuit based on a third PWM signal obtained by adding or subtracting a correction value to a period.

The control circuit includes a storage unit,
2. The light source lighting device according to claim 1, wherein the correction value is obtained by previously storing a difference between an ON period of the first PWM signal and an ON period of the second PWM signal in the storage unit. .

The control circuit includes a storage unit,
2. The light source lighting device according to claim 1, wherein the correction value is obtained by previously storing a difference between an off period of the first PWM signal and an off period of the second PWM signal in the storage unit. .

The control circuit includes:
A storage unit;
An input terminal;
With
The control circuit includes:
When the first signal is inputted to the input terminal, the first PWM signal which is set to a predetermined ON period and inputted to the light control circuit, measures the ON period of the first 2PWM signal, the predetermined A difference between an on period and the measured on period is calculated, and the calculated value is stored in the storage unit as the correction value;
When a second signal is input to the input terminal, at least one of an on period and an off period of the second PWM signal is measured, and the duty ratio of the second PWM signal is brought close to the duty ratio of the first PWM signal. 2. The light source lighting device according to claim 1, wherein the third PWM signal is generated by adding or subtracting the correction value to an on period and an off period of the second PWM signal.

The control circuit includes:
A storage unit;
An input terminal;
With
The control circuit includes:
When the first signal is inputted to the input terminal, the first PWM signal which is set to a predetermined OFF period entered in the light control circuit, measures the off-period of the first 2PWM signal, the predetermined Calculating a difference between an off period and the measured off period, and storing the calculated value as the correction value in the storage unit;
When a second signal is input to the input terminal, at least one of an on period and an off period of the second PWM signal is measured, and the duty ratio of the second PWM signal is brought close to the duty ratio of the first PWM signal. 2. The light source lighting device according to claim 1, wherein the third PWM signal is generated by adding or subtracting the correction value to an on period and an off period of the second PWM signal.

The control circuit includes:
A storage unit;
An input terminal;
With
The control circuit includes:
In case the first signal is inputted to the input terminal, the first PWM signal which is set to a predetermined ON period and inputted to the dimming circuit, the ON period of the first 2PWM signal is measured a plurality of times, Calculating a difference between the predetermined on-period and the average value of the measured on-period, and storing the calculated value as the correction value in the storage unit;
When a second signal is input to the input terminal, at least one of an on period and an off period of the second PWM signal is measured, and the duty ratio of the second PWM signal is brought close to the duty ratio of the first PWM signal. 2. The light source lighting device according to claim 1, wherein the third PWM signal is generated by adding or subtracting the correction value to an on period and an off period of the second PWM signal.

The control circuit includes:
A storage unit;
An input terminal;
With
The control circuit includes:
In case the first signal is inputted to the input terminal, the first PWM signal which is set to a predetermined OFF period entered in the light control circuit, the off period of the first 2PWM signal is measured a plurality of times, Calculating a difference between the predetermined off period and the average value of the measured off period, and storing the calculated value in the storage unit as the correction value;
When a second signal is input to the input terminal, at least one of an on period and an off period of the second PWM signal is measured, and the duty ratio of the second PWM signal is brought close to the duty ratio of the first PWM signal. 2. The light source lighting device according to claim 1, wherein the third PWM signal is generated by adding or subtracting the correction value to an on period and an off period of the second PWM signal.

A light source lighting device according to any one of claims 1 to 7,
A light source to which power is supplied from the light source lighting device;
With
An illumination device using an LED or an organic EL as the light source.