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This paper presents a core loss evaluation of AC filter inductor used on PWM converters. In order to increase the power density of the converters, high-frequency switching techniques have been applied. However, because of the limitation of cooling capability, reduction of volume of the passive components, especially the magnetic components, are limited. In order to overcome the problems, it is necessary...
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 novel iron loss calculation method is proposed based on an iron loss map for an AC filter inductor used in a pulsewidth-modulation (PWM) inverter. The iron loss map, previously reported by the authors, is created by measuring the dynamic minor loop on the B-H plane, and this is used for the calculation of inductor iron loss in the dc chopper circuit. However, in the case of an AC filter inductor...
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...
An iron loss measurement method for ac filter inductors used on PWM inverters is proposed in this paper. A distinctive feature of this method is that the iron loss of the ac filter inductor can be individually measured in each switching period, thereby allowing the loss distribution during one cycle of output frequency to be observed easily. The measurement system is composed of a PWM generator, an...
This paper discusses noise currents in a control or gate-drive circuit of a 200-kHz PWM inverter. When the MOSFETs of the inverter are turned-on or -off, the noise current flows into the control and drive circuits. As a result, a malfunction in the controller of the inverter may occur. The equivalent circuit for the noise current is estimated from the experimental waveforms. This paper discusses three...
The authors have reported a novel iron loss calculation method based on a loss-map of the magnetic materials. A distinctive feature of this method is that the iron loss on the inductors can easily be calculated in many kinds of converters dynamically. The dynamic measuring method of the dynamic minor-magnetic loop by using the buck-chopper circuit is presented. Next, some typical characteristics of...
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