Dimming bias circuit for LV halogen lamp - uses magnetic actuator providing DC magnetic field for controlling operating frequency of control transformer in bias circuit
Номер патента: DE4318996A1
Опубликовано: 24-02-1994
Автор(ы): Des Erfinders Auf Nennung Verzicht
Принадлежит: Medium Tech I G
Опубликовано: 24-02-1994
Автор(ы): Des Erfinders Auf Nennung Verzicht
Принадлежит: Medium Tech I G
Реферат: The circuit uses a self-oscillating half-bridge circuit using a pair of power transistors (9,10) with parallel diodes (28,29) and series capacitors (18,19), with a switch element (4) on its input side and control transformer (17) on its output side. The dimming is effected via an external DC magnetic field provided by an actuator (20) having a magnetic field strength of at least 0.3 mT. Pref. the actuator is mounted on the outside of the housing enclosing the transformer at a variable distance from the latter, used to determine the strength of the DC magnetic field and hence the transformer operating frequency. ADVANTAGE- Simplified design.
Control method and apparatus for controlling motors of air conditioner
Номер патента: US5712540A. Автор: Yoshio Ogawa,Koichi Toda. Владелец: Fujitsu General Ltd. Дата публикации: 1998-01-27.