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This paper presents a single-phase grid connected inverter with a power decoupling circuit. In the single-phase grid connected inverter, it is well known that a power pulsation with twice the grid frequency is contained in the input power. In a conventional inverter, electrolytic capacitors with large capacitance have been used in order to smooth the DC voltage. However, lifetime of those capacitors...
In a vehicle, radiational noise generated by the common-mode current in an inverter system is the cause of electromagnetic problems of in-vehicle radio antennas. This paper proposes a new method ”Z-matched ACC” for suppressing the common-mode current at AM band. With this method, the freewheel current, which reduces the common-mode current suppression effect at AM band in conventional voltage-cancellation...
This paper presents a novel motor surge voltage suppression system which utilizes a newly developed surge suppression cable. The feature of the system is that the surge suppression cable is connected in parallel with the motor terminal those independent from the main cable, and there is no need to connect any passive filter component for suppressing the motor surge voltage. The advantage of this method...
Iron loss of an AC filter inductor used in a PWM inverter is discussed based on a dynamic minor loop method developed by the authors. A distinctive feature of the dynamic minor loop method is that the instantaneous iron loss of the AC filter inductor can be measured during every switching period of the inverter, and the instantaneous iron loss distribution during one cycle of the output frequency...
A method for the control of a single phase voltage type (PWM) inverter that can generate arbitrary waveforms in a wide frequency region is presented. The feature of this method is that single-phase rotation coordinate transformation is applied. A 90 degrees phase shifter is required, although there is no ideal phase shifter. The operational characteristics are experimentally compared using two kinds...
High frequency plasma processing techniques are utilized in the field of industrial manufacturing. High frequency plasma generators are traditionally composed of analog amplifiers, although their conversion efficiencies are limited up to 50 %. A current-output-type inverter, composed of an immittance conversion element, that enables constant current injections to the loads and megahertz plasma discharging...
A photovoltaic AC module system has been expected to be installed on the private residences. The AC module inverter needs an active power decoupling circuit in order to enlarge the lifetime and to decrease the volume of the inverter by eliminating a large electrolytic capacitor on the input DC-bus. This paper proposes novel flyback-type single-phase grid interactive inverters with two modulation methods,...
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