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:
Nov. 13, 2007
Filed:
Sep. 01, 2006
Satoshi Yokoo, Ota, JP;
Satoshi Yokoo, Ota, JP;
Sanyo Electric Co., Ltd., Moriguchi-shi, JP;
Abstract
Two systems consisting of an on-off control section corresponding to the saturation drive system and a constant voltage control section corresponding to the constant voltage drive system are provided as a circuit for controlling the conduction state of a transistor QPprovided at the output section. The constant voltage unit comprises an operational amplifier A, which monitors the output voltage Vout and feedback-controls the gate voltage of QP. On the other hand, the on-off control section delivers a control signal for turning on and off QPcorresponding to an input signal input to IN-U through invertersand. Switchesandfor selectively applying the output from the control unit of either one of these two systems are provided to select the switch to be turned on based on a mode signal input to SW. This configuration enables the realization of different drive systems and restricts increase in circuit size while commonly using the output unit configured with comparatively large transistors. In addition, since the saturation drive system can be realized without depending on feedback control, high control responsiveness is secured to appropriately perform operation at high frequencies such as switching operations by PWM control.