Equipped with the most advanced industry technology which allows the unit to reach significant levels of efficiency, Liebert PDX guarantees an efficient thermal management of data centers and server rooms. Liebert PDX is available both in air cooled and water cooled versions to suit various site installation requirements. It also allows multiple freecooling modes of operation (Direct Air, Indirect Water, Chilled Water on Freecooling Chiller and Liebert® EconoPhase™ pumped refrigerant economizer) increasing its ability to adapt to diverse application demands. Liebert® EconoPhase™ pumped refrigerant economizer is compatible with Liebert PDX and Liebert MC to improve thermal management and control, while drastically cutting energy costs and lowering pPUE. The unit’s Digital Scroll configuration, instead, is responsible for modulating cooling capacity while the fresh air economizer function, operated by the iCOMTM control, is adopted when outside air temperature is colder than the return temperature.

In addition, the combination of R410A refrigerant, Electronic Expansion Valve (EEV) and new generation Liebert® EC Fans 2.0 all allow the unit to reach significant levels of efficiency. Liebert PDX is designed to provide efficient small and large room cooling for data centers, where efficiency, flexibility and simplicity of installation are key factors. Learn more about Liebert PDX from the news release: Emerson Network Power Redefines Environmental Control Standards with Liebert PDX Freecooling Solution and New Thermal Management Business.This short online course is open to all staff at UCL. The course is designed to support and complement your UCL Arena Fellowship Application and CMALT, UCL's portfolio in e-learning. The course aims to: course has three units, each lasting two weeks. Each of the three units will focus on a separate topic that surveys have shown UCL colleagues are especially interested in: week of each Unit will introduce ideas and technologies, and

involve activities such as forum discussions, wikis orThe second week is for you to try out the techniques yourself in our practice course and at the end of the second week we will bring everyone together in a live webinar where you can exchange ideas andYou'll receive an email at the start of each week  to inform you that the week's course content is available. The activities for each unit will be spread over a two week period and should take no more than 2-3 hours a week. For more information, please visit the UCL Arena Digital Moodle pages.The challenges AC/DC power supply developers face today are achieving high power factor, low THD, and high efficiency across line and load conditions, high power density or reduced size, high reliability, and low system cost. Advanced power topologies such as interleaved PFC, bridgeless PFC, phase-shifted full-bridge DC/DC, LLC resonant DC/DC, and ZVS PWM DC/DC are commonly employed in today's designs addressing these needs.

In addition, OEMs are demanding additional features such as more sophisticated fault diagnosis, power measurement, and more extensive status reporting over I2C or CAN interface. Digital controllers offer the obvious advantages of combing PWM control and additional features, reducing part count and BOM. They can implement different compensation schemes under different conditions, making it possible to achieve high PF, low THD, and high efficiency across line and load ranges. how window ac unit worksThis can be as simple as using different parameters and as elaborative as shedding phases, throttling back on PWM frequency or switching to a different compensation such as feed forward on sudden line or load change. how much power does an ac unit useTechniques such as over sampling or biasing of sensed current can be implemented for example to improve PF and THD at high line and light load. do i need a large ac unit

Another advantage of digital controllers is the possibility of different versions of firmware for different product offerings based on the same h/w reducing the time and investment associated with making h/w changes. Most AC/DC power supplies use dual PWM controllers, a PFC controller and a DC/DC controller. This is also true for applications using TI digital controllers. However, TI's digital controllers can combine both PFC and DC/DC control without compromising either PFC or DC/DC performance. Challenge with using a single controller is output voltage sensing and load sharing control across isolation boundary. Its main advantage is integration and not having to deal with two separate controllers. Digital controllers rely on fast on-chip ADC to sample and convert the currents and voltages, fast CPU to execute the compensation and update the control or PWM duty, and on flexible PWM module to generate the PWM patterns for different power topologies. They also rely on extra CPU bandwidth and additional peripherals for system supervisory and communication tasks.

On-chip analog comparators closely coupled into the PWM generation are also commonly seen peripherals to help save CPU bandwidth and increase loop bandwidth. High PWM resolution is required for high PWM switching frequency which is critically important in today's designs. Digital controllers rely on executing software code to perform control and system supervisory functions. So, robust code development and debugging tools are critical. The High performance FET Drivers-UCD7XXX family features high speed, high current, and FAST over-current protection. It is designed to directly interface with digital controllers. TI's UCC27xxx drivers are also used with digital controllers. TI's Integrated Hot Swap Power Controllers are optimized for nominal -48V systems. The devices provide load current slew rate control and peak magnitude limiting. Most of the Hot Swap Controllers have digital interface for precise programming and monitoring and also have Power good and fault outputs.