TAILIEUCHUNG - Diode application
Zener diode and applications, Voltage multiplication. | Diode application Rectifier circuit Half-wave Full-wave Full-wave bridge With capacitor Clipper Clamper Zener diode and applications Voltage multiplication Half-wave rectifier Vi(t)>0 => D on Vi(t) D off Full-wave rectifier Vi>0 => D1 on, D2 off Vi D1 off, D2 on Full-wave bridge rectifier Vi>0 => D2, D4 on; D1, D3 off Vi D2, D4 off; D1, D3 on Full-wave rectifier with capacitor Vi>0 => D1 on, D2 off Vi D1 off, D2 on Clipper Parallel or serial Serial: Vi>V => Vi – V > 0 => D on => Vo=Vi-V Vi Vi – V D off => Vo=0 Clipper Parallel with additional source Vi>4V => D off => Vo = Vi Vi D on => Vo = 4V Clamper Shift the level of DC Must have a capacitor and a diode in the circuit Zener diode 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 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 Positive phase: D1 on, D2 off, VC1=Vm Nagative phase: D1 off, D2 on, VC2=Vm+VC1=2Vm Multiple voltage Positive phase: D1 on, D2 off, VC1=Vm Negative phase: D1 off, D2 on, VC2=Vm+VC1=2Vm Diode – effect of temperature Homework Chapter 2: 1, 5, 6, 10, 11, 15, 21, 23, 24, 27, 30, 34, 37, 42, 47, 49, .
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