Non isolated power supply helps in stepping up or down the voltage by a small ratio. These simple and low cost supplies are used in low noise margins and high peak current demands, with the personel regulators placed close to the point of use. They are also simple and low in cost.
5 Types of Non Isolated Power Supply
Regulated High Voltage Power Supply Schematic
The five basic types of point of load converters are:
1. Buck: Used for voltage reduction, the buck converter has four main components: switching power, flywheel diode, inductor, and yield filter capacitor. The control circuit regulates yield voltage by switching the power on and off at a fixed frequency, but at varying duty cycles. The supervene is a Dc yield voltage that is a fraction of the input voltage.
2. Boost: Used for voltage step-up, the boost converter has components arranged differently from the buck converter. Here, the yield voltage is regulated by the varying switching duty cycle. The ratio of step up can be represented as 2:1, when the duty cycle is 50%.
3. Buck-boost: This non isolated power supply can be used for voltage step-up or step-down. They have the same components as buck and boost converters; they are albeit arranged in a distinct way. This converter increases or decreases voltage based on the duty cycle. Step up happens when the duty cycle is below 50%; step down happens with a duty cycle of above 50%; and the voltage remains the same when the duty cycle is exactly 50%. This converter produces yield voltage that is reverse in polarity to the input.
4. Cuk: Used for voltage growth and reduction, Cuk converter has an additional capacitor and inductor. Like buck-boost, it produces an yield of inverted polarity. It also has series inductors at the input and output, which leads to lower current ripple in both circuits.
5. Charge-pump: These are used for voltage growth or inversion in low power applications. Compared to other converters, this shop power as electric charge in the capacitor (others store power in the inductor's magnetic field). A microscopic unlikeness in the circuit can make them function as either a voltage step up or inversion device.
What Are the 5 Types of Non Isolated Power Supply?