Ads
related to: controlled rectifier half wave
Search results
Results From The WOW.Com Content Network
Half-wave rectification requires a single diode in a single-phase supply, or three in a three-phase supply. Rectifiers yield a unidirectional but pulsating direct current; half-wave rectifiers produce far more ripple than full-wave rectifiers, and much more filtering is needed to eliminate harmonics of the AC frequency from the output.
A silicon controlled rectifier or semiconductor controlled rectifier is a four-layer solid-state current-controlling device. The name "silicon controlled rectifier" is General Electric 's trade name for a type of thyristor .
The controlled rectifier input allows power factor correction to take place. The second half of the digital phase converter consists of IGBTs that draw on the power previously stored in the DC bus to create an AC voltage that is not sinusoidal. It is a pulse-width modulated (PWM) waveform very high in harmonic distortion.
The characteristics and components of ripple depend on its source: there is single-phase half- and full-wave rectification, and three-phase half- and full-wave rectification. Rectification can be controlled (uses Silicon Controlled Rectifiers (SCRs)) or uncontrolled (uses diodes). There is in addition, active rectification which uses transistors.
Active full-wave rectification with two MOSFETs and a center tap transformer. Replacing a diode with an actively controlled switching element such as a MOSFET is the heart of active rectification. MOSFETs have a constant very low resistance when conducting, known as on-resistance (R DS(on)). They can be made with an on-resistance as low as 10 ...
A half-wave rectifier may be considered a wye connection (star connection), because it returns the current through the center (neutral) wire. A full-wave rectifier is more like a delta connection, although it can be connected to the three-phase source of either wye or delta and it does not use the center (neutral) wire. [citation needed]
Ad
related to: controlled rectifier half wave