A Proposal of a New Gradient Driver with a Gradational Voltage Inverter for Low Power Loss

• Published in: IEEJ JOURNAL OF INDUSTRY APPLICATIONS Vol. 141; no. 12; p. 942
• Main Authors: Oishi, Masayuki, Kobayashi, Ryosuke, Sakashita, Tomokazu, 将幸, 大石, 亮祐, 小林, 友一, 坂下
• Format: Journal Article
• Language: Japanese
• Published: Tokyo Japan Science and Technology Agency 01.01.2021
• Subjects: Amplitudes; Control methods; Direct current; Electric potential; Electric power loss; Image quality; Inverters; MOSFETs; Ripples; Voltage
• DOI: 10.1541/ieejias.141.942
• ISSN: 2187-1094

This paper proposes a new gradient driver with a gradational voltage inverter for low power loss and downsized filter circuits. Gradient drivers produce direct current with low ripple amplitudes to achieve high image quality and high slew rates to obtain images rapidly. The proposed gradient driver is characterized by low ripple amplitude of the output current from the inverter composed of SiC-MOSFETs and high output voltage from another inverter composed of IGBTs. This paper discusses both the principle of operation and control method of the new gradient driver. Experimental verification is performed on a full-scale system. The results show the advantages of the proposed gradient driver based on loss analysis by calculations.