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The ultrasonic spindle is well-known as one of the processing equipment and has high-machining performances. An ultrasonic transducer used for the ultrasonic spindle drive is usually driven by high-frequency sinusoidal voltage. To supply this sinusoidal voltage to the ultrasonic transducer attached to the rotary axis, a rotary transformer, instead of the voltage transfer method using a brush and a...
In order to develop a new style drill for the factories, the ultrasonic spindle was designed. Rotary transformer was introduced to solve the design problems existing in the specification and structure. However, rotary transformer's voltage conversion ratio is markedly lower than the inductance ratio, it cannot transmit sufficient electric power to the ultrasonic element. Then, this problem is being...
Since the loss of input rectifying diode bridge in the conventional PFC converter reduces the efficiency, the bridgeless PFC converter has been proposed. The totem-pole bridgeless PFC converter is the most representative one. However the common mode noise current occurring around the input voltage zero-crossing brings severe EMI problem restricts its practical application. In order to improve noise...
Optimal techniques for power supply with transient current circuit are introduced in this paper. The circuit reduces switching loss of buck converter's main switch effectively. However, in our previous researches, it could be operated with high efficiency only at heavy loading. The techniques to get rid of this disadvantage are proposed and the validity of it is verified through experiments.
This paper discusses the operating characteristics of push-pull type series resonant converter. The AC equivalent model and AC analysis of push-pull type series resonant converter are confirmed by analytically and experimentally. Moreover, the operating characteristics of push-pull type series resonant converter including SR are also investigated.
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