no slide title · rangkaian dioda penyearah setengah gelombang (half wave rectifier) transformer...
TRANSCRIPT
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Elektronika(TKE 4012)
Eka Maulana
maulana.lecture.ub.ac.id
Rangkaian Dioda
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Pokok Bahasan
• Penyearah Setengah Gelombang
• Penyearah Gelombang Penuh
• Penyearah Jembatan
• Choke & Capacitor-input Filter
• Rangkaian Clipper
• Rangkaian Clamper
• Pengganda Tegangan
Rangkaian Dioda
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Pre: Power Supply
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Vin Vout
Ideal: VP(in) = VP(out)
Penyearah Setengah Gelombang
Vout
VP
Vin
VP
Rangkaian Dioda
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• Output nilai DC adalah nilai rata-rata (average).
Vdc = VP/p
fout = fin
• Menggunakan pendekatan kedua:
VP(out) = VP(in) - 0.7 V
Rangkaian Dioda
Penyearah Setengah Gelombang(Half Wave Rectifier)
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Transformer review
• When the turns ratio (N1/N2) is greater than 1, the primary voltage is stepped down.
• When the turns ratio is less than 1, the primary voltage is stepped up.
• Dotted ends have the same instantaneous phase.
• Full-wave rectifiers require a winding with a center tap.
Rangkaian Dioda
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Penyearah GelombangPenuh Vin
Vout
Vout
C.T.
Rangkaian Dioda
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Penyearah Gelombang Penuh(Full Wave Rectifier)
• Output nilai DC adalah nilai rata-rata (average).
Vdc = 2VP/p
fout = 2fin
• Input pada masing-masing dioda adalah setengah dari tegangan sekunder.
• Menggunakan pendekatan kedua:
VP(out) = VP(in) - 0.7 V
Rangkaian Dioda
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Penyearah Jembatan
(Bridge)Vin
Vout
Vout
Rangkaian Dioda
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Bridge rectifier
• Output nilai DC adalah nilai rata-rata (average).
Vdc = 2VP/p
fout = 2fin
• Menggunakan pendekatan kedua:
VP(out) = VP(in) - 1.4 V
Rangkaian Dioda
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Ringkasan – Dioda Penyearah
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The choke-input filter
Vin
L
C RL Vout
When XL >> XC:
XCVout @
XL
Vin
Rangkaian Dioda
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+
-
0
Charge
Discharge
VP
VR =I
fC
peak-to-peak ripple voltage
The capacitor-input filter
Rangkaian Dioda
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Dc output voltage drops when load current increases
• Ac line regulation can have an effect
• Bulk resistance of rectifiers causes a voltage drop
• Resistance of transformer windings causes a voltage drop
• Ac ripple increases and average dc decreases
Rangkaian Dioda
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Diode ratings
• Half-wave rectifier with capacitor-input filter:PIV = 2VP Idiode = Idc
• Full-wave rectifier with capacitor-input filter:PIV = VP Idiode = Idc
• Bridge rectifier with capacitor-input filter:
PIV = VP Idiode = 0.5Idc
Rangkaian Dioda
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Bridge supply troubleshooting
• No output - - blown fuse, two or more
diodes open, load shorted
• Low output/extra ripple - - bad filter,
open diode, shorted winding, overload
• Full-wave signal at output - - open filter
capacitor
• Half-wave ripple frequency - - open diode
Rangkaian Dioda
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Vin Vout
RS
RL
Positive clipper
0.7 V
Rangkaian Dioda
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Vin Vout
RS
RL
Negative clipper
-0.7 V
Rangkaian Dioda
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C
RL
Positive clamper
Vout
-0.7 V
Stiff clamper: RLC > 100T
Rangkaian Dioda
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C
RL
Negative clamper
Vout
0.7 V
Stiff clamper: RLC > 100T
Rangkaian Dioda
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Half-wave voltage doubler
C2
D2
2VP
C1
D1
VP
Rangkaian Dioda
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Multiplier tegangan output (beban Floating)
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Full-wave voltage doubler
VP
VP
2VP
Rangkaian Dioda
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Persoalan: Hitung Vdc danVR pada beban RL masing-masing rangkaian