和600伏特设计比较,800伏特准谐振反激变换器的电压频谱在1兆赫兹以下更高一点,在1兆赫兹以上开始变小。
As it can be seen the voltage spectrum of the 800v quasi resonant flyback is higher at frequencies below 1 MHz, and is getting lower above 1 MHz compared to both 600v designs.
除了几个谐振频率,在1兆赫兹以下的频带,干扰信号在不同峰值电流下测试出来的结果仅有微小的差别(图14和图15)。
Only little differences in the frequency range under 1 MHz at different current peak values (Fig. 14 and Fig. 15) can be noticed except from some resonance frequencies.
这种铃声的频率在8000赫兹以上,据说只有25岁以下的人能听到,因为青少年的高频听力还没受损伤。
It is said the magic cellphone ringtone, with a frequency of above 8000hz, can only be heard by people under the age of 25, whose hearing of high frequency sounds have remained unimpaired.
如电网需求开始超过供应负荷,电网将降到正常操作频率以下——英制50赫兹或美制60赫兹。
When demand on the grid begins to exceed supply, the grid drops below its normal operating frequency – 50 Hz in the UK, 60 Hz in the US.
如电网需求开始超过供应负荷,电网将降到正常操作频率以下——英制50赫兹或美制60赫兹。
When demand on the grid begins to exceed supply, the grid drops below its normal operating frequency – 50 Hz in the UK, 60 Hz in the US.
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