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leading current 【電學】超前電流。

leading edge

The product adapts to single - phase asynchronous motor and three - phase asynchronous motor , which is supplies with single - phase power and the frequecy is blew 100hz . it is specially used for supplying leading current for elecrtomtor , and then the electromotor is actuated with the adeqate moment consequently . and when the electromotor runs smoothly , the capacitor will disconnect from the circuit . the product possesses stable capacity and long relative runtime 1 .用途及特點適用于100hz以下單相異步電動機和單相電源供電的三相異步電動機,專門用于向電動機提供超前電流,使電動機獲得足夠的力矩而起動。

The 1mhz fixed frequency switching allows for tiny external components and the regulation scheme is optimized to ensure low emi and low input ripple . an external resistor sets the full - scale led current , while two digital inputs control on / off and select amongst three levels of brightness . the circuit operates in 1x mode until just above dropout 工作在1mhz固定頻率,采用線性調制模式使輸入紋波大大減小;利用一個外部電阻可以設置滿量程led電流;外接兩個數字信號控制芯片開關并選擇led三級亮度中的一級;具有過溫、過壓/欠壓等保護功能,工作溫度范圍為- 40 + 85 。

The outside of this chip adopts boost structure to drive up to seven white leds with the input voltage ranging from 3v to 5v . series connection of the leds provides identical led current resulting in uniform brightness 電路的電源輸入在3v 5v變化,采用boost電路結構升壓,在極限情況下最多可驅動七個白光led ,由于led串聯,因此各led電流完全匹配,亮度一至。

There are two relatively independent sub - blocks in the system : self - adjusting charge pump and parallel led current control driver 整個電路包括兩個相對獨立的模塊:具有自適應調整功能的電荷泵電路和并聯led電流控制電路。

A leading current interpretation holds that they are blocks of ice floating on a recently frozen sea covered by dust 目前最有代表性的解釋是它們是一塊塊浮在一片被沙塵掩蓋,最近凍結的海洋上的冰塊。