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罗克韦尔1746-IO12
是驱动阶段的时间,这里需要注意起始有个tBLANK消隐时间(一般几个us以内),主要是为了避开(不检测)MOS管打开时刻的电流噪音毛刺,防止误触发过流保护。
可以理解的是tBLANK太小起不了作用,太大则可能导致后续的tDRIVE不足,特别是在一个电流正弦周期内所需tBLANK不同,若简单一个固定值,则电流波形过零点失真明显。
tOFF则是整个电流续流时段。tOFF时间到期后,H桥重新启用,开始另一个PWM循环。
电流续流的衰减模式
电流续流的三种控制模式
1► 慢衰减 Slow Decay
2► 快衰减 Fast Decay
3► 混合衰减 Mixed Decay
注:这里的所谓“快”“慢”是指续流期间电流衰减到零的相对速度。
1746-IO12
1746-IO12
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