To enable an apparatus in an electronic control system to perform two or three wire operations.
A power supply (150) can supply power to the enclosed circuitry in both two and three wire installations. Two separate zero cross detectors are used such that timing information can be collected in both two and three wire installations. Both zero cross detectors (110) are monitored and are used to automatically configure electronic control. Over voltage circuitry senses an over voltage condition across a MOSFET which is in the off state and turns the MOSFET on. The over current circuitry senses when the current through the MOSFETs has exceeded a predetermined current threshold and then turns the MOSFETs off so they do not exceed the MOSFETs' safe operating area. Latching circuitry (120) is employed to keep the protection circuitry in effect even after a fault condition has cleared. Lockout circuitry (130) is used to prevent one protection circuit from tripping after the other circuit has already tripped from a fault condition.
CHRISTENSEN GRAHAM
JOHNSON BENJAMIN AARON
LEICHLITER SHAWN L
NEWMAN ROBERT C JR
THOMPSON STEPHEN SPENCER
WU CHENMING
| JP4303106B2 | 2009-07-29 |
| US6010310A | 2000-01-04 | |||
| US5804991A | 1998-09-08 |
Jun Tsuruta
Tomohiro Minamiyama
Kenichi Nakamura