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:
Aug. 15, 2000
Filed:
Oct. 21, 1999
Allen F Rozman, Richardson, TX (US);
Lucent Technologies, Inc., Holmdel, NJ (US);
Abstract
A DC--DC converter includes a transformer having at least a primary winding, a secondary winding and a drive winding. An input circuit is coupled to the transformer primary winding for coupling an input DC voltage to the transformer primary winding. A first output channel couples the transformer secondary winding to a first output. The first output channel includes a self-driven synchronous rectifier circuit, a first inductor, and a first capacitor. A first pulse width modulator is coupled between the first output channel and the input circuit to drive the input circuit, thereby regulating the first output channel. A second output channel couples the transformer secondary winding to a second output. The second output channel includes a control switch, a freewheeling rectifier, a second inductor, and a second capacitor. A second pulse width modulator is coupled between the second output channel and the control switch for controlling a conduction interval of the control switch, to thereby regulate the second output channel independent of the first output channel. An enabling switch, controlled by the second pulse width modulator, is coupled between the transformer drive winding and a control terminal of the control switch, such that the enabling switch modifies a voltage of the transformer drive winding to control the conductivity state of the control switch. A drive rectifier is coupled between the transformer drive winding and a control terminal of the freewheeling rectifier. A discharge switch is coupled to the control terminal of the freewheeling rectifier, wherein the discharge switch is controlled by the second pulse width modulator to control the conductivity state of the freewheeling rectifier.