TAILIEUCHUNG - Power Electronic Handbook P4

Uncontrolled Single-Phase Rectifiers Sam Guccione Single-Phase Half-Wave Rectifiers Operation A single-phase half-wave rectifier consists of a single diode connected as shown in Fig. . This is the simplest of the rectifier circuits. It produces an output waveform that is half of the incoming AC voltage waveform. The positive pulse output waveform shown in Fig. occurs because of the forward-bias condition of the diode. A diode | 4 Rectifiers Sam Guccione Eastern Illinois University Mahesh M. Swamy Yaskawa Electric America Ana Stankovic Cleveland State University Uncontrolled Single-Phase Rectifiers Single-Phase Half-Wave Rectifiers Single-Phase Full-Wave Rectifiers Uncontrolled and Controlled Rectifiers Uncontrolled Rectifiers Controlled Rectifiers Conclusion Three-Phase Pulse-Width-Modulated Boost-Type Rectifiers Introduction Indirect Current Control of a Unity Power Factor Sinusoidal Current Boost-Type Rectifier Appendix Uncontrolled Single-Phase Rectifiers Sam Guccione Single-Phase Half-Wave Rectifiers Operation A single-phase half-wave rectifier consists of a single diode connected as shown in Fig. . This is the simplest of the rectifier circuits. It produces an output waveform that is half of the incoming AC voltage waveform. The positive pulse output waveform shown in Fig. occurs because of the forward-bias condition of the diode. A diode experiences a forward-bias condition when its anode is at a higher potential than its cathode. Reverse bias occurs when its anode is lower than its cathode. During the positive portion of the input waveform the diode becomes forward biased which allows current to pass through the diode from anode to cathode such that it flows through the load to produce a positive output pulse waveform. Over the negative portion of the input waveform the diode is reverse-biased ideally so no current flows. Thus the output waveform is zero or nearly zero during this portion of the input waveform. Because real diodes have real internal electrical characteristics the peak output voltage in volts of a real diode operating in a half-wave rectifier circuit is VP out VP in - Vf where VP in is the peak value of the input voltage waveform and VF is the forward-bias voltage drop across the diode. This output voltage is used to determine one of the specification values in the selection of a diode for use in a half-wave rectifier. Other voltage and .

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