The reporter learned from Xi'an Jiaotong University that the team of professor Geng Li from the School of Microelectronics at the school used a new type of active rectifier structure based on an adaptive delay controller to remove the continuous time comparator with large power consumption in the original structure, and proposed The adaptive delay control method reduces the power consumption of the active rectifier. It has the advantages of low power consumption, high accuracy, and good process robustness. It can be widely used in wireless energy transmission systems in consumer electronics, biomedicine, and the Internet of Things. In recent years, its related research results were published online in the top journal of the field of integrated circuits, "Journal of Solid State Circuits".
In the field of wireless energy transmission, the power chip at the energy receiving end usually includes a three-level structure of a rectifier, a DC-DC converter and an LDO. Improving the efficiency of all levels of structure is conducive to improving the overall efficiency of the wireless energy transmission power system. Compared with the traditional diode rectifier, the active rectifier has higher efficiency at low voltage, especially its light load efficiency has been subject to the greater power consumption of the continuous time comparator in the structure. In addition, the conventional active rectifier adopts a delay compensation structure, causing problems such as multiple pulses of the active rectifier, which affects the stability and reliability of the rectifier.
The new structure of the active rectifier chip proposed by the team of Professor Geng Li of Xi'an Jiaotong University applied to the wireless energy transmission system has improved the accuracy of time adjustment. The current control delay and latch logic are used to generate the control signal of the power MOS tube. The structure avoids the multiple pulse phenomenon existing in the traditional active rectifier, and improves the stability and reliability of the rectifier. The adaptive delay control makes the rectifier have higher resistance to process, voltage and temperature fluctuations through the negative feedback loop, which improves the robustness of the circuit. The active rectifier is tape-out verified using a 0.18μm CMOS process and has a static power consumption of less than 230μW. When the output power of the rectifier is 10.63mW, the peak efficiency of 94.1% is reached.
In recent years, Professor Geng Li has made some research achievements on the design of low-power power management chips, and has published high-level papers in internationally renowned journals such as IEEE JSSC, IEEE TPE, IEEE TCAS-I, etc. These research results are low power consumption The design of the power management chip provides new methods and new ideas. (Reporter Shi Junbin Xie Nanping)
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