![]() The output voltage will be a pulsating DC when both voltage and current at the load side are of one polarity. Thus, the diode will be in reverse bias and no current will flow to the load. However, during the negative half cycle of the input sinusoidal wave, the anode turns negative with respect to the cathode. The diode will be in forward bias which then results to flowing of current to the load. One of its main application is the rectification of AC power to DC power.ĭuring the positive half cycle of the input supply, the anode turns positive with respect to cathode. Converting AC to DCĭiodes are usually used to construct different types of rectifier circuits such as half-wave, full-wave, center-tapped and full bridge rectifiers. Usually, a resistor is connected to make sure that the maximum allowable dissipation power is not exceeded. ![]() Therefore, the voltage at the Zener diode is almost the same. The current increases while the diode’s resistance decreases. Looking at the current-voltage curve for Zener diodes, you’ll notice a sharp increase above the breakdown voltage which proves that it is best in stabilizing small direct voltages. The amount of current flowing in it is important because it is the key to stabilization. The current flowing through the Zener diode is reduced in favour of the load current when the load resistor is connected in parallel to the Zener diode. Given the input voltage and the required output voltage, we can use the Zener diode with voltage approximately equal to the load voltage. ![]() The Zener diode current will always be at minimum if the minimum input voltage and the maximum load current is applied. High power rating diode is usually used because it can handle reverse bias above its breakdown voltage. Since the diode is connected to the positive terminal of the supply, it works as a reverse bias that can also work in breakdown condition. ![]() In the figure above, the current in the diode is limited by the series resistor connected to the circuit. ![]()
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