The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 2020
Filed:
Jan. 16, 2019
Takumi Hyugaji, Isehara, JP;
Minoru Kado, Hachioji, JP;
Takumi Hyugaji, Isehara, JP;
Minoru Kado, Hachioji, JP;
MITSUMI ELECTRIC CO., LTD., Tokyo, JP;
Abstract
A switching power source apparatus includes: a synchronous rectifier switching element for synchronous rectification constituted of an insulated-gate field-effect transistor; and a secondary-side control circuit including a detector circuit and a timer circuit. The secondary-side control circuit performs ON/OFF control of the synchronous rectifier switching element. The detector circuit monitors a voltage of a drain terminal of the synchronous rectifier switching element, and detects an abnormal state in which the voltage of the drain terminal is undetectable. The timer circuit starts up and measures a predetermined time in response to the detector circuit detecting the abnormal state. When the detector circuit detects the abnormal state, and the predetermined time elapses according to the timer circuit, the secondary-side control circuit outputs a detection signal indicating an abnormality to outside.