The half-wave rectifier is an electrical circuit that converts an AC voltage to DC voltage. It achieves this function using one diode. Most of our electronic projects use a half-wave rectifier using a diode in the conversion of their power. We can achieve the construction of the circuit in so many ways.
Principles of operation of a half-wave rectifier.
As we all know. A diode is an electronic component that only allows the flow of an electrical current in one direction. In any circuit or any place you see a diode-connected. It must be performing these functions.
In a half-wave rectifier, a diode connects in series with the load. So when an alternating current is applied to it, the diode will conduct only in forward bias. Forward bias in the sense that during positive oscillation, the diode will conduct. And during the negative oscillation, the diode revises bias and the electrical current won’t flow through it.
Materials needed when designing a half-wave rectifier circuit.
Step down transformer.
An electronic diode.
A capacitors or an inductor.
AC voltage source.
Having provided yourself with these materials, you are now set for the construction of a half-wave rectifier.
Is always advisable you carry out your design, using electronic software. After the design on software, you connect your circuits on a breadboard before connecting to a vero board for soldering.
Designing of a half-wave rectifier circuit.
When constructing a half-wave rectifier, the following steps should help you do your connections perfectly.
- Step 1.
Having drawn the diagram above, or from the diagrams. Sketch the diagram above on electronic software using your PC. But don’t bother yourself if you don’t have a PC system as you can easily sketch the circuit diagram using pencils.
- step 2.
The connection should be made exactly as it is on the diagrams above.
So get your step-down transformer, and study the thermals. On studying the transformer, detect your input and output. You should understand that the transformer is a bi-directional device. This means that the output can serve as your inputs why your input can also serve as output. The transformer in this project is to help us step down an AC voltage to a lower AC voltage which won’t be high for our components on the circuit.
To connect the primary coil of the step-down transformer to the cable plug. The primary is the terminal to be connected to the AC voltage source. While secondary side, which is the step-down side are to be be use for our circuit work.
- Step 3.
The connection of a diode to the circuit. As we know before, the diode is a two-terminal device. The anode (+) and the cathode(-). We should be able to determine the anode and cathode of the diode. This to help us safely connect the diode to our circuit works.
How to determine the polarity of a diode.
The electronic diode is one of the electronic devices that we can easily determine their polarity. without testing with a meter or any device.
When we get diode components. By main looking at the components is observed that on one side the components are having a ring of paint around the component.
so the side painted white is the cathode(-) while the other side is the anode(+).
- Step 4.
Make a connection of load resistor between the diode to the neutral side of the circuit. Make the connection exactly as it is on the circuit diagram above.
At this stage, the circuit is correct but the output of the circuit won’t give out a pure half DC volts. And for us to achieve that, we need to filter out the AC component on the output.
Filtering out AC components on the output waveform of half-wave circuit.
These are the ways we can make the output wave to be pure DC voltages by removing the ripples on the output waveform. There are two ways you can be able to achieve this aim. Is either by connecting a capacitor or inductor on the circuit. This will filter out unwanted ripples on the output side and makes the output to be a pure DC.
The capacitor should connect in parallel to the output side of the circuit or the inductor connected in series with the circuit.