五、發明説明（1 ) 本發明係關於一種發光二極體（L E D)驅動系統。 攸美國專利5471052得知一種LED驅動系統。在已知之驅 動系統中，有兩個光學接收器，每一個形成LED光線信號 ，此等信號互相隔開，所形成的部分用作控制微處理器的 輸入L號其中祕處理益控制驅動系統的功率轉換器與兩 個光學接收器。對於每一個光學接收器，系統結舍反饋電 路，以修正周圍光線的光學接收器信號。如此一來，便為 led之光線輸出變化與周圍光線，補償驅動LED產生的光線 。已知驅動電路的缺點是其複雜的結構。 本發明之目的在提供一種LED驅動裝置，其中抑制了該 缺點。根據本發明，具有附控制器之功率轉換器之LED驅 動系統，具有 •形成LED光線信號SL之裝置，此一LED光線信號认係由 至少一驅動LED所放射光線所產生； •補償周圍光線之LED光線信號Sl的裝置，其週期地對 周圍光線取樣，並產生將從信號SL扣除之周圍光線信 號S A 〇 本發明之驅動系統的優點，是以比較簡單的電路配置， 用改良的信號對雜訊比，提供周圍光線的修正。由於從信 號SL中扣除了信號SA，周圍光線修正形成一個前饋迴圈。 在根據於本發明之LED驅動系統中，週期地對周圍光線取 樣的裝置’宜具有控制周圍光線信號SA的裝置，其中該周 圍光線信號SA係於對應到最後週期取樣之值上產生。這進 一步導致驅動系統的簡化。這也應用到驅動系統的一具體 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 1288910 五、發明説明（3 ) 在圖1中，A、B是LED驅動系統的輸入端，其中具有附控 制器III之功率轉換器I的LED驅動系統，具有 •形成LED光線信號SL之裝置IV，此一 LED免線信號係由 至少一驅動LED II所放射光線所產生； •補償周圍光線之LED光線信號SL的裝置V，其週期地對 周圍光線取樣，並產生將從信號SL扣除之周圍光線信 號SA。 由led驅動系統所驅動之LED，被連接到系統之輸出端ε 、D。在實用的具體實施例中，通常有一 LEDs陣列，其連 接到輸出端，並由驅動系統操作。 用來週期地對周圍光線取樣的裝置v，具有L樣品與控制 電路SH，此一控制電路形成控制周圍光線的裝置，其中 «亥周圍光線信號S A係於對應到最後週期取樣之值上產生。 裝置V進一步具有控制計時gTR之脈衝產生器pG，此一計 時器控制配置於功率轉換器丨與所連接之LED π之間的開關 SW。 用來形成信號SL與用來產生信號5八的裝置，具有共用的 光敏器件ΡΤ。 在減法電路SUB中，從信號SL扣除所產生的信號SA。所 得之信號V0ut饋送到上例中附有控制器(：(：之抓1^的轉換器 舉例來說’控制轉換器操作的p wM電路。 圖2中，所顯示之曲線圖，呈現由脈衝產生器pG所產生 之信號1〇〇與由計時器TR所產生的信號ι〇ι。縱軸方面，信 張尺度適用中國國家規格(2ι〇χ297 公董） -6 - 1288910V. DESCRIPTION OF THE INVENTION (1) The present invention relates to a light emitting diode (L E D) driving system. U.S. Patent 5,471,052 teaches an LED drive system. In the known drive system, there are two optical receivers, each forming an LED light signal, which are separated from each other, and the formed portion is used as an input L number for controlling the microprocessor. Power converter with two optical receivers. For each optical receiver, the system correlates the feedback circuit to correct the optical receiver signal of the ambient light. In this way, the light output of the led light changes and the surrounding light compensates for the light generated by the driving LED. A disadvantage of the known drive circuit is its complex structure. SUMMARY OF THE INVENTION An object of the present invention is to provide an LED driving device in which this disadvantage is suppressed. According to the present invention, an LED driving system having a power converter with a controller has means for forming an LED light signal SL, which is generated by at least one of the LEDs that emit light; The device of the LED light signal S1 periodically samples the ambient light and generates an ambient light signal SA deducted from the signal SL. The advantage of the drive system of the present invention is that it is a relatively simple circuit configuration, with improved signal matching The ratio provides a correction for ambient light. Since the signal SA is subtracted from the signal SL, the ambient light correction forms a feedforward loop. In the LED driving system according to the present invention, the means for periodically sampling the ambient light preferably has means for controlling the ambient light signal SA, wherein the ambient light signal SA is generated at a value corresponding to the last period of sampling. This further leads to a simplification of the drive system. This also applies to a specific paper size of the drive system for the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 1288910 V. Invention Description (3) In Figure 1, A, B are the input of the LED drive system End, wherein the LED drive system with the power converter I of the controller III has a device IV for forming an LED light signal SL, the LED free line signal is generated by at least one light emitted by the LED II; The device V of the ambient light LED light signal SL periodically samples the ambient light and produces a ambient light signal SA that is subtracted from the signal SL. The LEDs driven by the led drive system are connected to the output terminals ε, D of the system. In a practical embodiment, there is typically an array of LEDs connected to the output and operated by the drive system. The means v for periodically sampling the ambient light has an L sample and control circuit SH which forms means for controlling ambient light, wherein the ambient light signal S A is generated at a value corresponding to the last cycle of sampling. The device V further has a pulse generator pG for controlling the timing gTR, the timer controlling a switch SW disposed between the power converter 丨 and the connected LED π. The means for forming the signal SL and for generating the signal VIII have a common photosensor ΡΤ. In the subtraction circuit SUB, the generated signal SA is subtracted from the signal SL. The resulting signal V0ut is fed to the controller attached in the above example (: (: the converter of the grab 1^, for example, the p wM circuit that controls the operation of the converter. In Figure 2, the graph shown is presented by the pulse The signal generated by the generator pG is 1 〇〇 with the signal ι〇ι generated by the timer TR. In terms of the vertical axis, the letter scale applies to the Chinese national standard (2ι〇χ297 DON) -6 - 1288910
號的振幅以任意的單位繪製，而橫轴則形成時間軸。 在本發明之驅動器配置的實用具體實施例中，功率轉換 窃係由WO 01/05193中所揭示的轉換器形成，其可適當地用 來才呆作LED陣列，舉例來說，GR〇9〇〇53224型，製成照明光 線，而為交通號誌系統的零件。轉換器係由12〇伏特（v)， 60赫茲（Hz)的電源來驅動。 如同形成產生信號SL之裝置Iv與產生信號SA之裝置v之 零件的光敏器件，使用印菲尼翁（Infine〇n)所製造之光二極 體型SHF2400。在74HCt221型之積體電路（k)中，結合脈衝 產生為’與計時器。脈衝產生器在介於丨與2千赫茲重複 頻率上，產生具有50微秒Us)持續時間的負方塊脈衝。如 此一來，其藉由25微秒（# s)脈衝之計時器，在每一個負脈 衝產生脈衝的起始處，控制產生。重複的頻率以不形成多 重電源供應頻率較佳。在此一具體實施例中，樣品與控制 電路係由飛利浦（Philips)所製造之NE5537型積體電路（丨〇提 供。 在上述具體實施例中，smps具有主要的開關，其於驅動 電路之操作期間，在50千赫茲（kHz)與130千赫茲（kHz)之間 ，即脈衝產生器之重複頻率上面幾個十之變化的重複頻率 上，疋轉換的。因此這大的差異，在該兩個重複頻率之間 沒有同步。 本文中所揭示之驅動系統，能夠監視，並視需要修正驅 動LEDs所產生的光線強度，同時實現了周圍光線影響的修 本纸張尺度適用中國國家標準(CNS) A4規格(21〇χ297公釐)The amplitude of the number is plotted in arbitrary units, while the horizontal axis forms the time axis. In a practical embodiment of the driver arrangement of the present invention, the power conversion system is formed by the converter disclosed in WO 01/05193, which can be suitably used to stay as an LED array, for example, GR〇9〇 Model 2453224, made into lighting light, and is part of the traffic sign system. The converter is powered by a 12 volt (v), 60 Hz (Hz) power supply. As the photosensor forming the part of the device Iv which generates the signal SL and the device v which produces the signal SA, the photodiode type SHF2400 manufactured by Infineon is used. In the 74HCt221 type integrated circuit (k), the combined pulse is generated as 'with a timer. The pulse generator produces a negative square pulse with a duration of 50 microseconds (Sus) at a repetition rate of 丨 and 2 kHz. As such, it is controlled by the 25 microsecond (# s) pulse timer at the beginning of each negative pulse generation pulse. The frequency of repetition is preferably such that no multiple power supply frequencies are formed. In this embodiment, the sample and control circuit is a NE5537 type integrated circuit manufactured by Philips (in the above embodiment, the smps have a main switch, which operates on the drive circuit). During the period, between 50 kilohertz (kHz) and 130 kilohertz (kHz), that is, the repetition frequency of the pulse generator's repetition frequency, the 疋 is converted. Therefore, the big difference is in the two There is no synchronization between the repetition frequencies. The drive system disclosed in this paper is capable of monitoring and, if necessary, correcting the intensity of the light generated by the LEDs, while at the same time achieving the effect of ambient light, the size of the paper is applicable to the Chinese National Standard (CNS). A4 size (21〇χ297 mm)