dc مقطعات التيار المستمر.pdf
TRANSCRIPT
אאא ٢٦١ א א
אאDC א
- ٩٦ -
אאW אאאאאאאW
• א • אאא • אאאאא • אאאאK
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אאאאאאאאאאאאאאאא
אאאאאאאאאאאא
אאאאאאאאאKאאאאא
אאאאאאאאאאאאא(duty cycle)
אאאאאאKאאW
J step-down (buck) choppersאאאאאאאK
J א step-up (boost) chopperאאאאK
אאא ٢٦١ א א
אאDC א
- ٩٧ -
٤ J١אאאA Basic DC ChopperW אF٤ J١Eאאאא
אSאא’Vs‘RKאא’Thyristor‘אא’Power
Transistor‘'MOSFET'אאאא'Insulated Gate Bipolar
Transistor'אK אאאא’switches‘
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א’turn-on‘K J אאאאא
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אאאאא’power loss‘א
אאאא’Input dc power‘אא’output dc
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אF٤ J١WERK
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אאאאאאאאאאא
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אאאאאאאאאאא
אאאאאאאאאא(Auxiliary Circuit)FEאאא’Commutation
circuit‘Kאאאאאאאאאאאאא
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٤ J٣אאאאR The Principle of Operation of a Basic DC Chopper Connected with a Resistive Load:
אא’vo‘אאאF٤ J١E
אאא’Vs‘(0 ≤ vo ≤ Vs)אאאא’S‘אאא
אKא’vo‘אא'S'אא'OFF'א
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VV so
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א’Vs‘0 ≤ V0 ≤ VsK אאאאא’Io‘אאאאF٤ J٣E
אאא’Io‘אאאאאאאאW
VVI so
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אאא ٢٦١ א א
אאDC א
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J אPulse-Width Modulation (PWM)K J אPulse-Frequency Modulation (PFM)K א‘TON’א‘PWM’א
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אאאאאאאא[PWM‘א’PFM‘K
אאאאא’PFM‘אא’S‘אאא
אאאא’high current ripples‘אאאאא
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٤ J٤אאאStep-Down (Buck) DC ChoppersW
٤ J٤ J١אאCase of An Inductive LoadW אאאאאא
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- ١٠٦ -
אאאאאאאK
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אאאאאאאF٤ J٧FEEאאא ’TON ≤ t ≤ T‘אאאא
אאאאאאאאאאKאאאאF٤ J٧FEE
אאאאאאאF٤ J٧FEEאאאאאא
א’TON ≤ t ≤ T‘אאאאאK אאאאא
אאאאאK אאאאאאאא
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OFFo T
LVII =− minmax F٤ J١٦E
א F٤ J١٦EF٤ J١١EminI،maxI
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אאאOPP iI ∆=−W minmax III PP −=− F٤ J١٩E
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- ١١١ -
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אאDC א
- ١١٢ -
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- ١١٣ -
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- ١١٤ -
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J אאאא'TOFF'W 5.05.01 =−=−= TT ONOFF T ms
J אאאאאF٤ J٦EW 7.705.0100
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J IP-PW 5.075.425.5minmax =−=−=
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٤ J٥W אF٤ J٧E
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