22C-B024N103

22C-B024N103

22C-B024N103

PWM信號(hào)的周期是固定的，由載波信號(hào)的頻率決定; 而占空比則是可變的，表示調(diào)制信號(hào)在一個(gè)周期內(nèi)處于高電平的時(shí)間與整個(gè)周期時(shí)間的比例。 占空比越大，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(gè)周期內(nèi)電信號(hào)的脈沖寬度和頻率，來控制輸出電壓或電流的大小。 通常，一個(gè)周期內(nèi)的脈沖寬度和頻率是可以調(diào)節(jié)的，從而可以控制輸出信號(hào)的平均值和波形。

1.載波頻率：也稱為PWM信號(hào)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(diào)制精度和低的失真。

2.調(diào)制波形：這是用于控制PWM信號(hào)占空比的調(diào)制信號(hào)，可以是模擬信號(hào)或數(shù)字信號(hào)。 在數(shù)字控制系統(tǒng)中，調(diào)制波形通常是一個(gè)由微處理器或FPGA生成的數(shù)字信號(hào)。

3.占空比：占空比是指PWM信號(hào)中高電平時(shí)間與一個(gè)周期時(shí)間之比。 在實(shí)際應(yīng)用中，占空比通常是由調(diào)制波形的幅值來控制的。 例如，當(dāng)調(diào)制波形的幅值為0時(shí)，PWM信號(hào)輸出為低電平; 當(dāng)調(diào)制波形的幅值為大值時(shí)，PWM信號(hào)輸出為大的高電平。

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