Electronic control systems and methods

电子控制系统中的一设备允许两线或三线操作。电源(150)将电源提供给其内设置有两线和三线的闭合电路。使用两个独立的过零检测器以便在两线和三线配置中可汇集定时信息。两个过零检测器(110)被监控并用于自动配置电子控制。过压电路检测其处于断开状态的MOSFET的一过压条件并且导通MOSFET，以便希望其不会到达雪崩区。过流电路检测流过MOSFET的电流何时超过预定电流门限值并且断开MOSFET以便其不过超过MOSFET的安全操作区(SOA)曲线。采用锁存电路(120)以使即使在清除了故障条件之后保持保护电路一直有效。采用了锁定电路(130)以防止一个保护电路在由于故障条件而断开了其他电路之后也被断开。希望将保护电路输出配置成可绕过并不考虑正常导通和断开电阻且几乎直接作用于MOSFET的栅极。最好是，该系统具有与低频可控传导设备并联的高效开关型电源。 An apparatus in an electronic control system allows 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 the electronic control. Over voltage circuitry senses an over voltage condition across a MOSFET which is in the off state and turns the MOSFET on so that it desirably will not reach the avalanche region. 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 (SOA) curve. 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. The protection circuitry output is desirably configured such that it can bypass and override the normal turn on and turn off impedance and act virtually directly on the gates of the MOSFETs. Preferably, the system has a high efficiency switching type power supply in parallel with a low frequency controllably conductive device.