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Inventor:
Jacobs; Mark E.
Address:
Dallas, TX
No. of patents:
50
Patents:












Patent Number Title Of Patent Date Issued
7821799 Ripple reduction for switch-mode power conversion October 26, 2010
A power converter includes an isolated or a nonisolated current-doubler rectification circuit including two magnetic circuit elements, each magnetic circuit element formed with a primary winding and a voltage-sensing winding. The primary windings are coupled in series. The voltage-se
7459893 Optimal feedback control of switch-mode power converters December 2, 2008
A power converter including a power switch, an output filter, and a controller. The output filter receives a switched input voltage and produces a filtered power converter output characteristic represented by a state vector. A controller coupled to the power switch and the output fil
7092259 Active clamp DC/DC converter with resonant transition system August 15, 2006
A dc-dc converter is disclosed comprising an active clamp topology, including an active clamp resonant transition system to provide substantially zero or reduced voltage for turn-on of the primary switch. The resonant transition system includes an inductor in series with the primary
6903944 Active clamp DC/DC converter with resonant transition system June 7, 2005
A DC--DC converter is disclosed comprising an active clamp topology, including an active clamp resonant transition system to provide substantially zero or reduced voltage for turn-on of the primary switch. The resonant transition system includes an inductor in series with the primary
6882548 Auxiliary active clamp circuit, a method of clamping a voltage of a rectifier switch and a power April 19, 2005
The present invention is directed to an auxiliary active clamp circuit and a method of clamping a voltage of a rectifier switch associated with a power converter. The power converter includes a main active clamp circuit associated with a main power switch coupled to a primary winding of
6822882 Gate driver with a DC offset bias circuit and a power converter employing the same November 23, 2004
A gate driver and a method of driving a switch for use with a power converter having a main active clamp circuit associated with a main power switch coupled to a primary winding of a transformer and a rectifier switch coupled to a secondary winding of the transformer. The main power
6646895 Bias supply circuit and a switching power supply employing the same November 11, 2003
A bias supply circuit and a method of operating a bias supply circuit for use with a switching power supply employing a main switch and an auxiliary switch and having an input voltage and a voltage across a clamp capacitor coupled to a transformer. In one embodiment, the bias supply circ
6606258 Voltage reference translation system and an electronic circuit employing the same August 12, 2003
For use with an electronic circuit having first and second reference nodes, a voltage reference translation system and a method of converting signals between the first and second reference nodes are provided. In one embodiment, the voltage reference translation system includes first and
6445597 Local loop control system for a multiple output power converter September 3, 2002
A local loop control system and method of operating the same for use with a power converter. The power converter includes a first output coupled to a first synchronous rectifier circuit and a second output coupled to a second synchronous rectifier circuit. The power converter employs a m
6400580 System and method for reducing a DC magnetic flux bias in a transformer and power converter empl June 4, 2002
A system and method for reducing a DC magnetic flux bias in a transformer and a power converter employing the system or the method. The power converter has a full bridge switching circuit coupled across a primary winding of a transformer and a hybridge rectifier circuit coupled across a
6396725 System and method for improving control loop response of a power supply May 28, 2002
A system and method for improving response of a control loop of a power supply. The power supply is configured to drive a load having at least one characteristic associated therewith. In one embodiment, the system includes: (1) a sensing circuit, associated with the power supply, con
6356461 Transformer flux observer for a full bridge power converter and method of operation thereof March 12, 2002
A system and method for estimating magnetic flux in an isolation transformer and a power converter employing the system or the method. The power converter has a full bridge switching circuit coupled across a primary winding of an isolation transformer. In one embodiment, the system i
6288920 Drive compensation circuit for synchronous rectifier and method of operating the same September 11, 2001
For use with a synchronous rectifier coupled to a secondary winding of a transformer and having a rectifier switch, a circuit for, and method of driving the rectifier switch and a power converter employing the circuit or the method. In one aspect of the present invention wherein the
6249447 System and method for determining output current and converter employing the same June 19, 2001
A system and method for determining an output current of a power converter having an output capacitor and a component coupled thereto. In one embodiment, the system includes (1) an observer circuit, parallel-coupled to the output capacitor, that senses a voltage across the output capacit
6243278 Drive circuit for synchronous rectifier and method of operating the same June 5, 2001
A drive circuit for driving a rectifier switch, a method of driving the rectifier switch and a power converter employing the drive circuit or the method. In one embodiment, the drive circuit includes (1) a blocking diode couplable to a bias energy source and configured to block reverse c
6201719 Controller for power supply and method of operation thereof March 13, 2001
A controller for a full bridge power converter having controllable switches, a method of operating the controller and a power supply employing the controller or the method. In one embodiment, the controller includes (1) a signal generator circuit designed to drive the controllable sw
6188586 Asymmetrical half-bridge power converter having reduced input ripple and method of manufacturing February 13, 2001
An asymmetrical half-bridge power converter and a method of manufacturing the same. In one embodiment, the asymmetrical half-bridge power converter includes: (1) first and second power switches configured to be controlled by complementary drive signals having nominal first and second dut
6178098 Phase-shifted post-regulator, method of operation thereof and power converter employing the same January 23, 2001
For use in a power converter having an inverter coupled to an output rectifier, a post-regulator, a method of operating the same and a power converter incorporating the post-regulator or the method. In one embodiment: (1) a switching circuit, having at least one controllable switch a
6122183 Two-stage, three-phase boost converter with reduced total harmonic distortion September 19, 2000
For use with a three-phase boost converter having a primary stage with a primary rectifier and a primary boost switch coupled between an input and output of the three-phase boost converter, an auxiliary stage, a method of reducing input current total harmonic distortion (THD) at the inpu
6094087 Gate drive circuit for isolated gate devices and method of operation thereof July 25, 2000
A gate drive circuit for an isolated gate device, a method of driving the same and a switch-mode power supply employing the circuit or the method. In one embodiment, the circuit includes: (1) a capacitor, having a first terminal coupled to a source of drive voltage and a second terminal
6091616 Drive compensation circuit for synchronous rectifier and method of operating the same July 18, 2000
For use with a synchronous rectifier coupled to a secondary winding of a transformer and having a rectifier switch, a circuit for, and method of driving the rectifier switch and a power converter employing the circuit or the method. In one aspect of the present invention wherein the
6078509 Multiple output flyback converter having improved cross-regulation and method of operation there June 20, 2000
For use with a flyback converter having a modulator for providing a main switch control signal thereto and main and cross-regulated output circuits, the cross-regulated output circuit subject to ringing and resulting voltage excursion, a voltage excursion controller and a method of o
6075716 Two-stage, three phase boost converter with reduced total harmonic distortion June 13, 2000
For use with a three-phase split boost converter having a primary stage with a primary rectifier and first and second primary boost switches coupled between an input and first and second outputs of the three-phase split boost converter, an auxiliary stage interposed between the input and
6069807 Compensation circuit method of operations thereof and converter employing the same May 30, 2000
For use with a switched-mode power converter having a modulator that develops a drive signal for a power switch, a compensation circuit, a method of compensating for a change in an output characteristic of the converter and a converter employing the circuit or the method. In one embo
6055166 Low trickle current startup bias circuit and method of operation thereof April 25, 2000
For use with a power converter having a power supply control circuit, a current startup bias circuit and a method of operating the same. In one embodiment, the circuit includes: (1) a charge reservoir that receives and stores a trickle current during a startup period of the power convert
6052294 Power supply snubber reset circuit April 18, 2000
For use in a power supply having a rectifying diode and a snubber circuit that includes a snubber inductor for absorbing a portion of a reverse recovery current associated with the rectifying diode, a circuit and method for resetting the snubber inductor and a power supply employing the
6046915 Phase selection circuit for three phase power converter and method of operation thereof April 4, 2000
An active circuit for delivering three phase AC input power received from a three phase rectifier to a boost converter and a method of operating the same. In one embodiment, the active circuit includes a phase selection switching circuit, coupled to the rectifier, that selects an inner p
6043997 Two stage, three-phase boost converter with reduced total harmonic distortion March 28, 2000
For use with a three-phase boost converter having a primary stage with a primary rectifier and a primary boost switch coupled between an input and output of the three-phase boost converter, an auxiliary stage, method of reducing input current total harmonic distortion (THD) at the input
6038147 Power supply employing circulating capacitor and method of operation thereof March 14, 2000
A power supply and method of operation thereof. In one embodiment, the power supply includes: (1) a primary side power switch, (2) an isolation transformer having a primary winding coupled to the primary side power switch, the primary side power switch conducting intermittently to tr
6038145 Controller for a power switch and method of operation thereof March 14, 2000
A controller for a power switch having an isolated control terminal and coupled to a secondary winding of a drive transformer and a method of preventing spurious turn-on of the power switch. The controller includes: (1) a controllable switch, coupled between the secondary winding and the
6031739 Two-stage, three-phase split boost converter with reduced total harmonic distortion February 29, 2000
For use with a three-phase split boost converter having a primary stage with a primary rectifier and first and second primary boost switches coupled between an input and first and second outputs of the three-phase split boost converter, an auxiliary stage, method of reducing input cu
6025999 Dual output power supply and method of operation thereof February 15, 2000
A power supply and a method of operating the same. In one embodiment, the power supply includes: (1) a DC-DC converter having an isolation transformer that conveys an alternating voltage of about a first frequency between a primary winding and at least one secondary winding thereof and
6002241 Dual mode split-boost converter and method of operation thereof December 14, 1999
A split-boost converter having a main inductor, first and second main switches and floating and fixed outputs and a method of operating the same. In one embodiment, the converter includes an auxiliary diode coupled between the main inductor and a first rail of the floating output, and an
5936857 Power converter having multiple output voltage capability August 10, 1999
For use in a power converter having first and second output diodes coupled to a secondary winding of an isolation transformer and first and second output inductors, coupled to the first and second output diodes, respectively, and an output derived from the first and second output ind
5912810 Controller for a power switch and method of operation thereof June 15, 1999
A controller for a power switch having an isolated control terminal and coupled to a secondary winding of a drive transformer and a method of preventing spurious turn-on of the power switch. The controller includes: (1) a controllable switch, coupled between the secondary winding and the
5912549 Current mode controller for continuous conduction mode power factor correction circuit and metho June 15, 1999
For use with a power factor correction circuit, a current mode controller, a method of operating current mode control to achieve power factor correction thereof and a power supply incorporating the controller or the method. In one embodiment, the controller includes: (1) a modulator,
5909108 Current-sharing circuit for parallel-coupled switches and switch-mode power converter employing June 1, 1999
For use in a switch-mode power converter including parallel-coupled first and second switches, the first switch having a temperature-dependent resistance, a circuit for, and method of, distributing current between the first and second switches. In one embodiment, the circuit includes a
5870291 Asymmetrical half-bridge converter having adjustable parasitic resistances to offset output volt February 9, 1999
An asymmetrical half-bridge converter, a method of operating the same and a power supply that incorporates either the converter or the method. In one embodiment, the converter includes: (1) a power transformer that receives asymmetrical AC input power into a primary winding thereof via a
5847548 Current-sharing passive snubber for parallel-connected switches and high power boost converter e December 8, 1998
For use in a boost converter having first and second boost switches coupled in parallel, a snubber for, and method of, improving current sharing between the first and second boost switches. In one embodiment, the snubber includes: (1) first and second snubber inductors, series-coupled
5844790 Split-boost converter having damped EMI isolation filter and method of operation thereof December 1, 1998
For use in a split-boost converter having a DC input, first and second outputs, a power train interposed between the DC input and the first and second outputs, a damped electromagnetic interference (EMI) filter circuit and method of reducing the EMI. In one embodiment, the EMI filter cir
5822199 Controller for a power switch and method of operation thereof October 13, 1998
A controller for a power switch having an isolated control terminal and coupled to a secondary winding of a drive transformer and a method of preventing spurious turn-on of the power switch. The controller includes: (1) a controllable switch, coupled between the secondary winding and the
5784269 Three phase high power factor converter using phase selection circuit July 21, 1998
For use in a DC/DC converter fed by a three phase rectifier, an active circuit and method for delivering an inner phase of three phase AC input power provided to the rectifier and a power converter employing the active circuit or the method. The active circuit includes: (1) a phase selec
5627455 Boost topology with two outputs for power factor correction application May 6, 1997
A split boost converter is disclosed herein, suitable for both single phase and three phase AC input applications. It provides two equal but unparallelable output voltages stored on two separate independent output capacitors. The implementation supports two modes of operation in which
5572416 Isolated input current sense means for high power factor rectifier November 5, 1996
A converter for enhancing power factor utilizes a line sense winding magnetically coupled to sense a voltage across a line inductor in the input of a high power factor power converter. This winding in the illustrative embodiment is typically a single turn. This winding provides a mea
5481219 Apparatus and method for generting negative bias for isolated MOSFET gate-drive circuits January 2, 1996
An isolated MOSFET gate drive includes circuitry to provide a negative gate bias during the off time of the MOSFET to enhance its immunity to inadvertent turn-on. The bias is generated by a self contained two terminal passive network which may be "floated" at any potential with respe
5457379 High efficiency switch mode regulator October 10, 1995
A switching boost regulator, including auxiliary circuitry having an auxiliary switch and inductor connected to operate the regulator in a zero-voltage transition mode, achieves substantial efficiency improvement by limiting losses in the auxiliary circuitry dedicated to achieving ze
5450029 Circuit for estimating a peak or RMS value of a sinusoidal voltage waveform September 12, 1995
An estimating circuit for application in estimating or deriving the value V.sub.rms.sup.2 or V.sub.peak.sup.2, of a line voltage V.sub.AC provides fast response time and a substantially ripple free value for these signals by the utilization of a controlled harmonic oscillator whose outpu
5391976 Power factor control arrangement for an OLS based on quarter cycle averaged power flow February 21, 1995
A power factor control system for a rectifier is operative through the generation of estimators of control input parameters (a peak squared input AC voltage E.sub.m.sup.2 and load power) and by the use of these substantially ripple free signals controls a boost, buck, buck-boost, SEP
5363289 Control apparatus for limiting voltage on a core reset capacitor November 8, 1994
A power converter circuit requiting the periodic reset of a core of the power transformer includes a control circuit operative to alter a response of the converters voltage regulation feedback control to limit and/or control the power switch duty cycle to regulate a voltage of the reset
5327333 Push push DC-DC reduced/zero voltage switching converter with off-set tapped secondary winding July 5, 1994
A DC-DC converter utilizes a tapped transformer secondary winding as a means of achieving output voltage ripple cancellation. This ripple cancellation occurs at a specified input voltage. It operates by fixing the location of a tap on the secondary winding of the power transformer so










 
 
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