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:
May. 08, 2018
Filed:
Jul. 07, 2017
Vpt, Inc., Blacksburg, VA (US);
Kevin L. Seaton, Blacksburg, VA (US);
VPT, INC., Blacksburg, VA (US);
Abstract
A switched mode power supply is provided comprising a pulse-width-modulator (PWM), a power section, and a drive section for the power switch. The drive section consists of a new method of driving the power switch where it is desired that the switch terminals be isolated from the PWM ground. The new driver design, which incorporates a small isolation transformer along with unique modifications to the traditional DC restore circuit, is directed to solving problems when PWM type switching power supplies encounter fault conditions such as a short circuit across their output as well as protecting the switch and the load when an ordinary shutdown or disable command is received. One problem that arises with switch drivers that utilize isolation transformers during an overload event or even an ordinary shutdown event is that the driver does not turn off and hold off the power switch when it is commanded to do so. This invention solves these problems by insuring that the appropriate components are de-energized in the classical dc-restore circuit which will prevent the PWM from losing control of the power switch.