Spark-proof device for undirectional frequency generator

Application Number: 00109075
Application Date: 2000.06.05
Publication Number: 1289172
Publication Date: 2001.03.28
Priority Information: 1999/9/21 KR 99-40529
International: H02M7/60
Applicant(s) Name: Samsung Electronics Co., Ltd.
Inventor(s) Name: Han Lyong-Un;Chang Sool-Dok;Gang Gwang-Sok
Patent Agency Code: 11021
Patent Agent: liu xiaofeng
Abstract A non-directional frequency generator spark prevention apparatus including a plurality of electric connections connected with a direct current power source, i.e., brushes, and a commutator for converting direct current waveform inputted through the brushes into alternating current waveform by rotational movement thereof, and for outputting the alternating current waveform. A voltage pulse controlling part is connected between the brushes of the non-directional frequency generator, while having a resistor and a transistor which are connected in series with each other, and the transistor is operated synchronously with the rotation of the commutator of the non-directional frequency generator. By controlling the electric current to flow through the transistor during the brush-off period, a spark production during the brush-off period can be prevented. The transistors are turned off during a period between a predetermined point in each brush-off period and a predetermined point in the following brush-on period so as to prevent sparking.