Fullwave rectifier is a kind of circuit for AC rectifier. In the rectifier circuit, within half a cycle, current flows through a rectifying device (such as a crystal diode), and in another half of the week, current flows through two rectifier device ,and the connection can passing through their current in the same direction through the load.The waveform of the fullwave rectifier is different from that of the half wave rectifier, which makes use of the 2.5 wave in the fullwave rectifier, which improves the efficiency of the rectifier, and makes the whole current smooth. So the fullwave rectifier is widely used in the rectifier. When applying the fullwave rectifier,the power transformer must have a center tap. The current direction of the load resistance R is always the same, regardless of the positive half cycle or the negative half cycle.
Fullwave rectifier so that the two halves of the cycle of alternating current are used. The rectification factor is different from half wave rectifier.Full wave rectifier circuit as shown in figure. It is composed of a power transformer with a center tap with a center tap, two rectifier diodes D1, D2 and load resistance RL. The transformer secondary voltage U21 and u22 are of equal size and opposite phase.
U21 = - u22 =The working process of the full wave rectifier circuit is: in U2 the positive half cycle (omega t = (PI) D1 is partial conduction, D2 anti bias cut-off, RL top-down current flow, the voltage on RL and U21 same.
In the negative half cycle U2 (t = Omega Pi Pi ~2), D1 D2 is reverse voltage, partial conduction, RL also has a current flowing from top to bottom,
The voltage on RL is the same as u22.The fullwave rectifier can draw a rectifier waveform as shown in figure Z0704.
Visible,the load on the RL is also a one-way pulsating current and pulse voltage. The mean values were: GS0705
The average current flowing through the load is GS0706
When choosing a rectifier diode, the two parameters should be used as the limit parameters.
The working process of the fullwave rectifier circuit is: in U2 the positive half cycle (omega t=0~ PI) D1 positively skewed conduction, D2 anti bias cut-off, RL top-down current flow,the voltage on RL and U21 same.
Fullwave rectifier output voltage of DC component (a half wave) is increasing,and it makes trouble, rectifier diode required to withstand a high reverse voltage, therefore,the fullwave rectifier is generally applicable occasions in the output voltage.