In most wire communication systems, communication lines are also utilized as dc power lines. So far, we proposed a new wire communication system. Main part of this system consists of lowpower switched-mode dc-dc converters. These converters construct a parallel connected power supply. Reliability and availability of the proposed wire communication system is higher than the conventional wire communication system. In this system, we considered two types of terminals, i.e., "Powering terminal" and "Powered terminal." Powering terminal is powered by commercial ac and supplies dc power to the communication lines. Powered terminal is powered from the communication lines.Powering terminal should prevent signal inflow from the communication lines. Powered terminal in most wire communication systems needs to separate ac signals and dc supply power in its input part connected to the communication lines. Therefore, the high input impedance circuit is needed in the input part of each terminal. The power loss of a conventional electronic choke circuit with high input impedance is high, and the direction of dc supply power is unidirectional. In our system, the direction of dc power is opposite in powering terminal at reception and powered terminal. Therefore, to use the same electronic choke for powering terminal and powered terminal, it is preferable that the electronic choke be bidirectional. So, we have proposed new electronic choke by the use of small inductors and an amplifier. The electronic choke has high impedance and an ability of good attenuation against signals. In addition, it has extremely low generation of own noise.For example, we consider about two buck-type dc-dc converters connected in parallel as a simple model. And, electronic chokes are connected as shown in Fig. 1(a). Here, switching frequencies of the converters were 200 kHz and 210 kHz. Drive signals for switching devices were not synchronized and their duty ratios were set to 0.5. The observation waveform of the output ripple voltage across the load resistor is shown in Fig. 1(b). This observation waveform is near the noise of our measurement system. We consider about two converters without electronic chokes connected in parallel for the comparison. Fig. 2 is observation waveform of the output ripple voltage of two converters connected in parallel. We can observe periodic beat with the frequency of 10 kHz.The electronic choke is a circuit of high performance in the attenuation against signal. The electronic choke can almost remove voltage ripple from the converter. This electronic choke can be also used in conventional wire communication system.
Non-memberMasaichi Fukunaga * *
Non-memberPowering terminal should prevent signal inflow from the communication lines. Powered terminal in most wire communication systems needs to separate ac signals and dc supply power in its input part connected to the communication lines. Our original communication system consists of low-power dc-dc converters. In our system, the direction of dc power is opposite in poweri...
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