SE20PJ-M3/85A

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Diodes are an essential component in most electrical systems, acting as a gatekeeper between two circuits, allowing/restricting the flow of electric charge. Rectifiers, specifically, are diodes designed for use with alternating current, allowing only DC (direct current) current to pass. Single rectifiers, such as the SE20PJ-M3/85A, are a versatile, compact and inexpensive type of rectifier that can be used in a number of different applications and scenarios. This article looks at the application fields and working principle of the SE20PJ-M3/85A single rectifier.

Application Fields

The SE20PJ-M3/85A rectifier can be used in a variety of circuits. In particular, these rectifiers are often used in power supplies and audio equipment, where they are responsible for converting AC into DC. This allows the device to take in an alternating current input of AC voltage, sometimes ranging from a few volts up to 480V, and provide a DC output.

Other applications for single rectifiers are in motors and transformers, where they serve to rectify the AC input so that it can be used to operate the motor or transformer. This type of rectifier is also perfect for applications requiring both a DC and AC output, as it can provide both from one device.

Finally, these single rectifiers can be useful for battery charging systems because they can convert the AC power of the mains into a DC power that can be used to charge a battery.

Working Principle

The SE20PJ-M3/85A operates on the principle of rectifying AC current. In other words, it takes an alternating current containing positive and negative voltages and converts it into a direct current that contains only positive voltages. This is achieved by using a PN junction diode which functions as a unidirectional valve, allowing current to flow in one direction, while blocking it in the other.

When current is applied, electrons flow in the forward direction and the diode is said to be in its “forward biased” state. Here, current can flow through the diode in the form of a single direction, thereby allowing only the positive parts of the current waveform to pass. In other words, the current is "rectified" by removing the negative voltages.

On the other hand, when the voltage is reversed, the diode is in its “reverse biased” state. Here, no current can flow through the diode, thus blocking the flow of electrons. This ensures that the AC current is rectified and converted into a DC current with only a single direction.

In order to ensure optimal performance, the SE20PJ-M3/85A is equipped with a bypass diode that acts as a safety feature to protect the device from excessive reverse voltage. The bypass diode is placed in parallel with the main diode, it is reverse biased when the main diode is in its forward biased state and is used to provide an alternate path for the reverse voltage which would otherwise damage the main diode.

Conclusion

The SE20PJ-M3/85A single rectifier is a versatile and cost-effective device that can be used in various applications such as power supplies, audio equipment, motors and transformers, and battery charging systems. It works by rectifying the AC current input and converting it into single-direction DC current, via the use of a PN junction diode. Additionally, the bypass diode provides a back-up safety feature, protecting the device from excessive reverse voltage.

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