owersupply功率補(bǔ)償-資料下載頁
2025-05-11 21:25本頁面
【正文】 this circuit does. 單擊此處編輯母版標(biāo)題樣式 Passage 7 Diode and power supply ? Transformers provide voltage/current ratio transformation, and also electrical isolation between the AC line circuit and the DC circuit. The issue of isolation is a safety concern, as neither of the output conductors in a nonisolated (direct) rectifier circuit is at the same potential as either of the line conductors. 單擊此處編輯母版標(biāo)題樣式 Passage 7 Diode and power supply 15 Observe the following two waveforms, as represented on an oscilloscope display measuring output voltage of a filtered power supply: If both of these waveforms were measured on the same power supply circuit, at different times, determine which waveform was measured during a period of heavier loading (a heavier load being defined as a load drawing greater current). 單擊此處編輯母版標(biāo)題樣式 Passage 7 Diode and power supply ? The lefthand waveform was measured during a period of heavier loading. If it is necessary for us to maintain a low amount of ripple under this heavy loading, what must we change in the power supply circuit? 單擊此處編輯母版標(biāo)題樣式 Passage 7 Diode and power supply 16 What is ripple? ?The capacitor does a good job of smoothing the pulses from the rectifier into a more constant DC. ?A small variation occurs in the DC because the capacitor discharges a small amount between the positive and negative pulses. Then it recharges. This variation is called ripple. ?The ripple can be reduced further by making the capacitor larger. ?The ripple appears to be a sawtooth shaped AC variation riding on the DC output. 單擊此處編輯母版標(biāo)題樣式 Passage 7 Diode and power supply 17 What does it mean if a power supply has a DC output with 5% ripple? ?This means the peaktopeak ripple voltage is equal to 5% of the DC (average) voltage. 單擊此處編輯母版標(biāo)題樣式 Passage 7 Diode and power supply 18 What does it mean if a power supply exhibits 2% voltage regulation? ?This means the difference between noload output voltage and fullload output voltage is 2% of the fullload output voltage. 單擊此處編輯母版標(biāo)題樣式 Passage 7 Diode and power supply 19 What will be the consequence of one diode failing open in the bridge rectifier of a singlephase power supply? ?The (unfiltered) output voltage will be halfwave, not fullwave.
畢業(yè)設(shè)計相關(guān)推薦
鄂ICP備17016276號-1