China
Africa
Explore chapters and articles related to this topic
Direct Current Power Systems
Published in Stephen W. Fardo, Dale R. Patrick, Electrical Power Systems Technology, 2020
Stephen W. Fardo, Dale R. Patrick
During the negative alternation of the AC input, diodes D2 and D4 are forward biased, while diodes 01 and 03 are reverse biased. Conduction occurs, as shown in Figure 7-22B, from the instantaneous negative side of the source, through diode D2, through the load device, through diode 04, and back to the instantaneous positive side of the AC source. Since a voltage is developed across the load device during both half-cycles of the AC input, a full-wave output is produced, as shown in Figure 7-22, that is similar to that of the full-wave rectifier discussed previously. For high values of DC output voltage, the use of a bridge rectifier is desirable, since the diode piv rating is one-half that of other single-phase rectification methods. A typical design of a bridge rectifier unit is shown in Figure 7-22.
Basic Diode Circuits
Published in Nassir H. Sabah, Electronics, 2017
An important parameter of a rectifier circuit is the peak inverse voltage (PIV) to which the diodes are subjected. This is because a practical diode has a maximum reverse voltage rating, beyond which breakdown occurs and the reverse current rapidly increases. It was mentioned earlier that when a diode does not conduct, the reverse voltage is v1 + v2 = 2Vm|sinωt| > 0, neglecting VD0. Hence, the PIV is 2Vm. If VD0 is taken into account, the peak load voltage is Vm − VD0, whereas the PIV is this voltage plus Vm, which is 2Vm − VD0.
Power sources and power supplies
Published in Stephen Sangwine, Electronic Components and Technology, 2018
Rectifier or power diodes have separate ratings for average forward current and surge current. As will be seen in the next section, the inclusion of reservoir capacitors in power-supply circuits can cause large surge currents to flow when the diodes start to conduct in each cycle. Power diodes also have greater forward-voltage drop than small-signal diodes so that power dissipation in a rectifier diode can be significant. Lastly, the maximum reverse voltage or peak inverse voltage (PIV) rating of rectifiers must be adequate both for the normal reverse voltages present in the circuit and for any abnormal transient voltages on the supply.
An Improved Z-Source Derived converter for Efficient PV Integration
Published in International Journal of Electronics, 2023
Yugal Kishor, Ramnarayan Patel, Lalit Kumar Sahu
The Peak Inverse Voltage (PIV) rating is a critical factor that impacts the dimensions, expenses, and power dissipation of semiconductor devices. The PIV is directly proportional to the voltage gain of the converter. This is due to the fact that PIV is a function of V0 and D. The voltage stresses on semiconductors can be represented by the following formulas, based on the description of switching modes in CCM. The According Fig. 1(d), it can be found that the voltage stress across switches VdsQ1 and VdsQ2 is expressed by (6):