Patent
1974-10-21
1976-05-11
Goldberg, Gerald
317 33SC, 321 14, 321 18, 321 45S, H02M 7515
Patent
active
039566846
ABSTRACT:
An AC electrical output is produced in the secondary windings of a transformer by alternately switching DC current in a primary winding with active element switches whose alternate switching action is controlled by the stored energy variations in a tertiary winding included with the output transformer and by a high efficiency switching control circuit which facilitates the switching transition of the active elements. This control is achieved in part, by providing a current sensitive latch which is triggered to its conductive state when a predetermined level of primary winding current is detected to thereby initiate a switching transition. This latch circuit is connected to conduct stored electrical charge with respect to the active element switch during the switching transition thus facilitating and promoting the efficiency of the switching operation. In addition, this same current sensitive latch is utilized to terminate normal inverter operations during excessive inverter load conditions and/or in response to detected excessive operation temperatures. In this latter regard, a special thermal protection circuit is employed for triggering the current sensitive latch. The special form of thermal protection circuit is especially adapted to protect integrally formed integrated circuits and is itself integrally formed therewith in a preferred embodiment. The thermal protection circuit includes a temperature sensitive element having a predetermined voltage versus temperature variation at a given current level in combination with a current regulation circuit for supplying and substantially maintaining a predetermined current level through the temperature sensitive element. A special form of periodic restarting circuit is also disclosed wherein another current sensitive latch is utilized to provide periodic starting pulses in the absence of normal inverter operation and to supplement control circuit and switching circuit supply currents during normal inverter operations.
REFERENCES:
patent: 3781638 (1973-12-01), Anderson et al.
patent: 3789289 (1974-01-01), Bell et al.
patent: 3816809 (1974-06-01), Kuster
Cohen Joseph T.
General Electric Company
Goldberg Gerald
Squillaro Jerome C.
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