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Wiring PLCs and I/O devices
Published in Raymond F. Gardner, Introduction to Plant Automation and Controls, 2020
Power-supply types can be unregulated, linear, or switching. Unregulated power supplies lack the feedback circuitry that controls the output voltage, which decreases as the amperage draw increases. If the unregulated power supply meets the load current while maintaining the minimum voltage requirement of the load, then the unregulated supply is a cheaper alternative. However, it is important to size the power supply adequately, as the power supply naturally increases the output current as the voltage drops to meet the power required by the load, which can cause overheating of the supply or load. The unregulated supply should have built-in capacitors to stiffen the dc voltage during transients. The regulated power supply includes feedback circuitry to fix the output voltage.
Introduction to Mechatronic Systems
Published in Bogdan M. Wilamowski, J. David Irwin, Control and Mechatronics, 2018
Considering the issues of commonly affected power supplies, how much power they can supply, how long they can supply without recharging, how stable their output voltage or current under varying load conditions, whether they provide continuous power or pulses, a regulated power supply can tightly control the output voltage and/or current to a specific value. A power management module is capable of power saving function during system idle to improve the power efficieny.
Design and Analysis of Hysteresis Feedback Controlled dc Power Supply for Solid State Power Amplifier
Published in IETE Journal of Research, 2022
Rohit Agarwal, Rajesh Kumar, Gajendra Suthar, Hrushikesh Dalicha
In a regulated power supply, the controller regulates the dc output voltage. The conventional controller is based on Pulse Width Modulation (PWM) where the switching frequency is fixed and duty cycle is varied to regulate the output voltage [5]. This scheme works in a continuous conduction mode [6]. There will be a possibility for power supply during low duty cycle and low load condition to enter in a discontinuous conduction mode. It is undesirable since it makes the controller to behave unexpectedly. To avoid this, a large inductor is required which makes the system bulky and less efficient. To allow the operation independent of the continuous or discontinuous mode, hysteresis feedback control is explored. Desired voltage ripple with good load regulation and good line regulation can be obtained in the entire load matrix. It can be achieved without compromising the dynamic response of the power supply. This control scheme has general implication and can be used with different voltage/power ratings.