公开(公告)号：US5022268A

公开(公告)日：1991-06-11

申请号：US355540

申请日：1989-05-22

申请人： H. Alan Wolf ,  David L. Chu

发明人： H. Alan Wolf ,  David L. Chu

IPC分类号： G01H17/00 ,  B01J8/24

CPC分类号： B01J8/1809 ,  B01J2208/00079

摘要： Vibrational Analysis technology translates acoustic/vibratory energy created by industrial processes into useful, process-related information. This invention enables a non-acoustical expert to easily collect and interpret the data.

公开(公告)号：US4523269A

公开(公告)日：1985-06-11

申请号：US552335

申请日：1983-11-16

申请人： Richard H. Baker ,  David L. Chu ,  Derek Chambers

发明人： Richard H. Baker ,  David L. Chu ,  Derek Chambers

IPC分类号： H02M5/14 ,  H02M5/257 ,  H02M7/48 ,  H02M7/515

CPC分类号： H02M7/4826 ,  H02M5/14 ,  H02M5/2576

摘要： A DC to N phase AC converter, where N is an integer greater than 2, includes a DC source having first and second terminals for deriving equal amplitude opposite polarity DC voltages, a series resonant circuit, and N output terminals, one for each phase of the converter. The series resonant circuit is selectively connected in series with the first and second terminals and the N output terminals for an interval equal to one half cycle of the resonant circuit resonant frequency, so that current flows between a selected one of the first and second terminals and the resonant circuit and a selected one of the N output terminals during the interval. The resonant circuit current is zero at the beginning and end of the interval. A capacitor shunting each of the output terminals has a value relative to the capacitance of the series resonant circuit such that the voltage across each output terminal remains approximately constant between adjacent exchanges of energy between the resonant circuit and the output terminal. The selective connection is in response to a comparison of the actual voltage across each of the N output terminals and a reference voltage for each of the N output terminals. The comparison controls when the flow of current between the selected first and second terminals and the selected output terminal via the resonant circuit begins. The frequency of the AC voltage developed across the N output terminals is much less than the resonant frequency of the circuit.

摘要翻译： 一个直流到N相交流转换器，其中N是大于2的整数，它包括一个直流电源，它具有第一和第二端子，用于导出相等极性的极性直流电压，串联谐振电路和N个输出端子， 转换器。 串联谐振电路选择性地与第一和第二端子和N个输出端子串联，间隔等于谐振电路谐振频率的一个半周期，使得电流在第一和第二端子中选定的一个和 所述谐振电路和所述N个输出端子中的所选择的一个在所述间隔期间。 在间隔的开始和结束时，谐振电路电流为零。 分流每个输出端子的电容器具有相对于串联谐振电路的电容的值，使得每个输出端子之间的电压在谐振电路和输出端子之间的相邻的能量交换之间保持近似恒定。 选择性连接是响应于N个输出端子中的每一个上的实际电压和N个输出端子中的每一个的参考电压的比较。 比较控制当所选择的第一和第二端子与所选择的输出端子之间的电流通过谐振电路开始时。 在N个输出端子上产生的交流电压的频率远低于电路的谐振频率。