| 摘要 |
A fluorescent lamp starter unit determines whether the lighting fixture into which it has been plugged is in a first state (for example, the lamp is off) or is in a second state (for example, the lamp is on). If the fixture is in the first state then the starter unit uses a first method to detect ballast type, whereas if the fixture is in the second state then the starter unit uses a second method to detect ballast type. In one example, the first method involves turning on the power switch of the starter unit at a time after a zero-crossing and then using the periodicity of a transient switch current signal to determine ballast type, whereas the second method involves turning on the power switch at the time of the zero-crossing and then using peak amplitude information of the transient switch current to determine ballast type.
|
