Diode application

Chia sẻ: Do Phuc Thinh | Ngày: | Loại File: PPT | Số trang:14

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Zener diode and applications, Voltage multiplication...

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Nội dung Text: Diode application

Diode application Diode • Rectifier circuit – Half-wave – Full-wave – Full-wave bridge – With capacitor • Clipper • Clamper • Zener diode and applications • Voltage multiplication
Half-wave rectifier Half-wave • Vi(t)>0 => D on • Vi(t) D off
Full-wave rectifier Full-wave • Vi>0 => D1 on, D2 off • Vi D1 off, D2 on
Full-wave bridge rectifier Full-wave • Vi>0 => D2, D4 on; D1, D3 off • Vi D2, D4 off; D1, D3 on
Full-wave rectifier with capacitor Full-wave • Vi>0 => D1 on, D2 off • Vi D1 off, D2 on
Clipper Clipper • Parallel or serial • Serial: – Vi>V => Vi – V > 0 => D on => Vo=Vi-V – Vi Vi – V < 0 => D off => Vo=0
Clipper Clipper • Parallel with additional source – Vi>4V => D off => Vo = Vi – Vi D on => Vo = 4V
Clamper Clamper • Shift the level of DC • Must have a capacitor and a diode in the circuit
Zener diode Zener • Forward bias: like normal diode • Reverse bias: – Work at the breakdown zone – Voltage = const (see the plot) • Application: always reverse bias – Reference voltage
Zener diode simple application Zener • IR=(Vin-Vz)/R; IL=Vz/RL; Pz=Iz*Vz RL >RLmin RLmax=Vz/(IR-Izmax) RLmin=RVz/ (Vi-Vz) • Vin varies, RL = const: Vimax > Vi > Vmin Vimax=RIRmax+Vz Vimin = Vz(R+RL)/RL
Double voltage Double • Positive phase: D1 on, D2 off, VC1=Vm • Nagative phase: D1 off, D2 on, VC2=Vm+VC1=2Vm
Multiple voltage Multiple • Positive phase: D1 on, D2 off, VC1=Vm • Negative phase: D1 off, D2 on, VC2=Vm+VC1=2Vm
Diode – effect of temperature Diode
Homework Homework • Chapter 2: 1, 5, 6, 10, 11, 15, 21, 23, 24, 27, 30, 34, 37, 42, 47, 49, 52