Number | Name | Date | Kind |
---|---|---|---|
4465943 | Risberg | Aug 1984 | |
5001620 | Smith | Mar 1991 | |
5111058 | Martin | May 1992 | |
5138184 | Keefe | Aug 1992 |
Entry |
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Joos, et al., An On-Line Ups With Improved Input-Output Characteristics, IEEE (1992) pp. 598-605. |
Campos et al., Ups System Employing High Frequency PWM Techniques, IEEE (1990) pp. 414-421. |