![]() ![]() Generally, the ADP1051 is used more often as secondary side control, as it is easy to have it communicate with the system. 2 The ADP1051 is based on flexible state machine architecture and provides many attractive features such as reverse current protection, prebias startup, constant current mode, adjustable output voltage slew rate, adaptive dead time control, and volt-second balance inside the chip, which reduces lots of external components compared with analog solution. The ADP1051 is an Analog Devices’ advanced digital power controller with a PMBus ™ interface, which targets high power density and high efficiency applications like intermediate bus converters. Isolated control loop is required to regulate the output voltage Function Comparison Between the Primary Side Control and Secondary Side Control Functionĭirect or simple dc regulated power supply is required to power the controllerĪuxiliary isolated power is required to power the controllerĪ primary side switches’ gate drivers do not need isolation synchronous rectifier gate drivers need isolationĪ synchronous rectifier’s gate driver does not need isolation primaryside switches’ gate drivers need isolation UVP and OVP stand for undervoltage protection and overvoltage protection, respectively, in the below table. Table 1 shows the function comparison between the primary side control and secondary side control. Primary Side Control and Secondary Side Control ComparisonĪccording to the position of the controller, the isolated power control methods divide into two types: primary side control and secondary side control. Reinforced Insulation: A single insulation system that provides a degree of protection against electric shock and is equivalent to double insulation under the conditions specified in this standard.Double Insulation: Insulation that comprises both basic insulation and supplementary insulation.Supplementary Insulation: Independent insulation applied in addition to basic insulation, in order to reduce the risk of electric shock in the event of a failure of the basic insulation.Basic Insulation: Insulation to provide basic protection against electric shock.Functional Insulation: Insulation that is only necessary for the correct functioning of the equipment.For instance, there are five categories of insulation introduced in UL60950: The isolation requirement specifies different levels of input and output voltage-both steady state and transient state-by many agencies throughout the world like VDE and IEC in Europe and UL in the United States. Isolation is an important method to meet safety standards. When designing a power supply, complying with safety standards is essential to protect operators and other personnel from electric shock and hazardous energy. ![]() This article discusses the digital isolation techniques to address these issues with Analog Devices’ iCoupler ® products in digital power supply design. These issues limit optocoupler or transformer use in some high reliability, compact size, and long life applications. The transformer solution also has bulk size, magnetic saturation problems, etc. 1 However, the traditional optocoupler solution has low bandwidth and current transfer ratio (CTR), which causes wide variation with temperature and degradation with time problems. ![]() The challenge of isolation in a digital power supply is in sending digital or analog signals across the isolation barrier with fast speed, accuracy, and compact size. For these applications, isolation is often required. Digital power supplies are widely employed in high end server, storage, telecom brick module, etc. With the aggressive growth of the internet and communication infrastructure, digital control techniques are becoming more and more popular in the power systems of telecom, networking, and computers because they can offer attractive advantages, including flexibility, component count reduction, advanced, control algorithm, system communication, low sensitivity to external noises, and parameter variation. Isolation in Digital Power Supply-Why and How ![]()
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