22C-B024N103
22C-B024N103
22C-B024N103
PWM信號的周期是固定的，由載波信號的頻率決定; 而佔空比則是可變的，表示調制信號在一個周期內處於高電平的時間與整個周期時間的比例。 佔空比越大，輸出電壓或電流的平均值越高，反之亦然。 也就是說控制一個周期內電信號的脈衝寬度和頻率，來控制輸出電壓或電流的大小。 通常，一個周期內的脈衝寬度和頻率是可以調節的，從而可以控制輸出信號的平均值和波形。
1.載波頻率：也稱為PWM信號的工作頻率，通常是固定的，一般選擇幾千赫茲至幾十千赫茲的頻率，以保證足夠高的調制精度和低的失真。
2.調制波形：這是用於控制PWM信號佔空比的調制信號，可以是模擬信號或數字信號。 在數字控制係統中，調制波形通常是一個由微處理器或FPGA生成的數字信號。
3.佔空比：佔空比是指PWM信號中高電平時間與一個周期時間之比。 在實際應用中，佔空比通常是由調制波形的幅值來控制的。 例如，當調制波形的幅值為0時，PWM信號輸出為低電平; 當調制波形的幅值為大值時，PWM信號輸出為大的高電平。
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