On the Output side, we will include short circuit protection and over-voltage protection circuit. Also, to deal with EMI issues, a common mode filter will be used for blanking out the generated EMI. Input surge protection will be used with a maximum operating input voltage of 275VAC. The output protection circuit protects the load device from getting damaged. The input protection circuit protects the SMPS from the transient and high input voltage. There are various types of protection circuits available that can be employed for the safe and reliable operation of the SMPS, but the protection system can be divided into two categories: input protection and output protection. ![]() We are going to order the transformer from a professional manufacturer and for the capacitor, we are going to use a low ESR value capacitor. The output ripple voltage depends upon two major factors which are the Transformer construction and the output filter, so we need to consider the two factors in our design. But if you are using this power supply to power highly sensitive electronics, then you need to consider that a good power supply will have a maximum output ripple voltage of 30mV pk-pk. As discussed earlier, the SMPS will work in both Constant Current and Constant voltage mode, which means the current will be limited to 1.3A considering how big of a load is attached.Īs the purpose of designing a constant current supply is to use it as a LED Driver or a battery charger, the output ripple specification will not matter that much. The output voltage of the power supply will be 12.6V with 1.3A Constant Current. This is also the rated input voltage for EU. The SMPS circuit we are building will have an AC input voltage rating of 220V-240V as it's the standard Indian specification. We also need to consider if the SMPS is inside an adapter or if it's in an open environment. Viper22A Based SMPS Circuit Design Specificationīefore we start our SMPS design, we need to shortlist the specifications because different types of SMPS work in different environments and they have input and output specifications. ![]() So, in this project, we will be adding in constant current capabilities to our Viper22A-based power supply and will document the entire construction process. It can also be used as a constant current LED driver to keep your LEDs from burning out. Constant current circuits are extremely helpful as they can be used to safeguard your circuit from overcurrent, as well as charge lithium batteries according to manufacturer requirements. CC and CV configuration is needed to build Lithium Battery Chargers, in this article we will design and build a 12.6V Li-ion battery charger to charge our 12V battery pack which we built in our previous tutorial. However, we did not discuss a Constant Current (CC) with a Constant Voltage (CV) power supply in any of those projects. We've already developed a few SMPS circuits, such as this 5V 2A SMPS circuit, a 12V 1A TNY268 SMPS circuit, and a 12V 1A Viper-based CV Circuit. These are omnipresent, from smartphone chargers to lab bench power supplies to medical tools. ![]() Switch Mode Power Supplies (SMPS) are one of the most generally used AC-DC Converters on the market as they accept 110V/230V AC as input and convert it to a desirable DC voltage level, making them useful for a wide range of applications.
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