介紹了采用ATmega48單片機(jī)實(shí)現(xiàn)三相無刷直流電機(jī)控制器的方法。利用Atmega48獲得帶死區(qū)的脈寬調(diào)制（PWM）、霍爾傳感器的換相處理、正弦驅(qū)動信號的產(chǎn)生和電機(jī)轉(zhuǎn)速的控制等功能。采用該方法的優(yōu)點(diǎn)是所需的外圍器件少，成本低。
Abstract:
The method of 3-phase brushless DC motor control based on ATmega48 is presented in this paper.The system uses ATmega48 to generate PWM signals with dead-time, hall sensors signals commutation，sine driving signal and rotational speed of motor.Using this method，the needed external devices are few, the cost is low.
將現(xiàn)行的供暖計費(fèi)方式由按建筑面積計費(fèi)變?yōu)榘聪牡臒崮苡嬞M(fèi)是供暖計費(fèi)方式發(fā)展趨勢，為了滿足這一計費(fèi)方式變化的需要，設(shè)計了基于IC卡的預(yù)付費(fèi)式新型供暖計費(fèi)系統(tǒng)，通過測量用戶采暖系統(tǒng)進(jìn)出口的溫度和流量，計算用戶消耗的熱能，利用IC卡記錄用戶預(yù)付費(fèi)的金額和當(dāng)年熱能的單價，根據(jù)熱能消耗和當(dāng)年熱能的單價計算用戶采暖費(fèi)，根據(jù)實(shí)際發(fā)生的供暖費(fèi)用和預(yù)付費(fèi)金額控制供暖的開停，這一計費(fèi)方式的變化使供暖計費(fèi)更趨合理。
Abstract:
It is trend that the mode of heat charging is changed from billing by building area to by thermal energy. In order to meet the needs of heat charging mode changing， a new system of heat charging based on IC card is proposed. The user?蒺s energy consumption is calculated by measuring the user inlet and outlet temperature and flow，using the IC card to record the prepaid amount and the current price of heat. The user?蒺s heating costs is calculated according to energy consumption and current price， according to actual heating costs and prepaid amount，the system controls the heating opening or stopping. It is more reasonable that calculated heating costs by user heat consumption
