Conference
Advanced Concepts for Power Quality
Schedule
Description
| Chairman: Yongdong Li, Tsinghua University, China | ||
| 13:00 | Two Phases Interleave Flyback Single Stage PFC AC/DC Conversion for LED Lighting A high-power-factor single stage two phase interleave flyback conversion for high efficiency LED lighting is presented herein, which is realized using UCC28060 two phase interleave PFC IC. By doing so, not only the power factor (PF) is improved but also the efficiency and the output power is upgraded. Some experimental results about a 150W single stage LED lighting power are provided to demonstrate the proposed control scheme. | |
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| 13:30 |
| High performance CRM PFC circuit with novel functions This paper is aimed for improvement of the efficiency and prevention of audible sound from inductor about a single-phase PFC circuit of critical conduction mode (CRM). As for the improvement of efficiency, the efficiency in a light to a middle load can be improved 6.5% by maximum frequency restriction. As for the prevention of audible sound at startup, it is achieved by the novel OVP (Over Voltage Protection) function. The characteristic analysis and application effect to improve two above-mentioned matters are described in this paper. |
14:00 |
| Hardware validation of battery state-of-health monitoring via Battery impedance Non intrusive continuous standby lead-acid battery monitoring devices are today available on the mar-ket, measuring the impedance on every bloc of a battery string, devices to be used as an indicator for the blocs state of health for standby applications such as UPS systems. The suggested paper will present the results of an extensive validation tests campaign, comparing the results provided in one hand by these simple monitoring devices, on the other hand by a full scale accurate laboratory equipment. These vali-dation tests have been performed by ageing many different types of battery blocs, blocs different in term of size (Ah), voltage, battery brands and technologies. Results show a clear relation between battery impedance changes and the loss of capacity of the battery bloc under scrutiny, and also validate the measurement made by the simple monitoring devices (single frequency impedance) when compared to a sophisticated laboratory equipments |
