发明名称 |
Control of AC power to inductive loads |
摘要 |
A control system is provided for controlling the average power from an alternating voltage source (AC) to a load having inductive properties. The system uses a synchronous switch shunted by a capacitor connected between the source (generator) and sink (load) to pulse duration modulate the AC voltage carrier wave. A control signal generator circuit drives the synchronous switch such that the switch is closed at a variable time early in each half-wave of the AC voltage source carrier wave and such that the switch is opened at a subsequent later, variable time during that half-wave. This is accomplished by sensing the voltage across the synchronous switch in order to inhibit closing of the switch early in the half-wave until the synchronous switch voltage (and thus the voltage on the capacitor) is substantially zero and then opening the synchronous switch at a point in time to give the desired volt-second area between closure and opening within each half-wave.
|
申请公布号 |
US5519311(A) |
申请公布日期 |
1996.05.21 |
申请号 |
US19840571830D |
申请日期 |
1984.01.19 |
申请人 |
DON WIDMAYER & ASSOCIATES, INC. |
发明人 |
WIDMAYER, DON F. |
分类号 |
H02M5/293;(IPC1-7):G05F1/445 |
主分类号 |
H02M5/293 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|