Jeffrey L. Sterrett

US Patent 7362600 Method and apparatus for cycle error correction for a power converter device, such as an electronic power inverter

US Patent 7378826 Methods and circuits for output over-voltage reduction in switching regulators

US Patent 7378828 DC-DC converter having magnetic feedback

US Patent 7379310 Over-voltage protection circuit for a switched mode power supply

US Patent 7382116 Semiconductor device configured to control a gate voltage between a threshold voltage and ground

US Patent 7388356 System and method for providing voltage regulation in a multi-voltage power system

US Patent 7388358 Method and apparatus for a pulse width modulated DC-DC converter

US Patent 7388763 Switching power supply

US Patent 7391187 Regulator with load tracking bias

US Patent 7391190 Apparatus and method for three-phase buck-boost regulation

US Patent 7391197 Apparatus for regulating output voltages with a current conversion module and analog to digital converter

US Patent 7391629 Switching mode power supply with controller for handling overcurrents

US Patent 7391630 Method and system for power factor correction using constant pulse proportional current

US Patent 7394231 Current-mode control for switched step up-step down regulators

US Patent 7394236 Digital double-loop output voltage regulation

US Patent 7394669 Switching mode power supplies

US Patent 7397226 Low noise, low power, fast startup, and low drop-out voltage regulator

US Patent 7397227 Fast-disabled voltage regulator circuit with low-noise feedback loop and operating method thereof

US Patent 7397678 Method for driving a switch that controls current drawn in a power factor correction circuit and a drive circuit therefor

US Patent 7400120 Constant voltage control device

US Patent 7400126 DC regulated power supply having voltage correction

US Patent 7402988 Switching regulator

US Patent 7403402 Method and apparatus for extending the operating range of a flyforward converter

US Patent 7403404 Power inverter system and method of correcting supply voltage of the same

US Patent 7405547 Stabilized DC power supply circuit having a current limiting circuit and a correction circuit

US Patent 7405551 Method and an apparatus to adjust duty cycle for voltage supply regulation

US Patent 7405951 Switching power supply device

US Patent 7405952 Power supply device

US Patent 7408334 DC converter with halt mode setting means

US Patent 7411375 Apparatus for issuing an electrical output signal

US Patent 7411378 Power factor controller that computes currents without measuring them

US Patent 7411380 Non-linearity compensation circuit and bandgap reference circuit using the same

US Patent 7411381 Circuit calibration using a time constant

US Patent 7411799 Apparatus and method for regulating a switching device

US Patent 7414383 Multi-phase voltage regulator with phases ordered by lowest phase current

US Patent 7414864 Switching power supply apparatus

US Patent 7414865 Controller having output current control for a power converter

US Patent 7417414 Semiconductor device provided with feedback circuit including resistive element and capacitive element

US Patent 7417875 Power converter employing integrated magnetics with a current multiplier rectifier and method of operating the same

US Patent 7417877 Digital power supply with programmable soft start

US Patent 7420355 DC-DC converter with over-voltage protection

US Patent 7423893 Power supply having two switch-mode power supply units

US Patent 7425819 Slope compensation circuit

US Patent 7426122 Power-converter control apparatus employing pulse width modulation and adjusting duration of a zero-voltage vector

US Patent 7426123 Finite state machine digital pulse width modulator for a digitally controlled power supply

US Patent 7429852 Constant voltage circuit capable of quickly responding to a sudden change of load current

US Patent 7432689 Buck-boost control logic for PWM regulator

US Patent 7432697 Universal input device for a tap changer

US Patent 7433209 Soft-switching DC/DC converter having relatively better effectiveness

US Patent 7433212 System linking apparatus for generated electric power

US Patent 7436156 Voltage converter circuit providing an usable output voltage from a very low input voltage

US Patent 7436160 Half bridge adaptive dead time circuit and method

US Patent 7436684 DC/DC-rectifier with reduced losses

US Patent 7439718 Apparatus and method for high speed voltage regulation

US Patent 7439719 Switching control circuit with off period adjustment

US Patent 7440296 Switched mode power supply having a control circuit for setting the switching frequency of the primary side switch in a linear relationship to a measurement voltage produced from the auxiliary voltage

US Patent 7440297 Fault detection for loss of feeback in forced switching power supplies with power factor correction

US Patent 7440298 Synchronous rectification circuit for power converters

US Patent 7440300 Transformerless power conversion circuit for grid-connected power generation systems

US Patent 7443147 DC-DC converter with step-up and step-down control capable of varying the offset voltage of the PWM triangle

US Patent 7443148 Constant on-time regulator with increased maximum duty cycle

US Patent 7443150 Switching power supply control with phase shift

US Patent 7443705 Apparatus and method for power conversion having diode in charging and discharging circuit

US Patent 7449866 Booster that utilizes energy output from a power supply

US Patent 7449871 System for setting an electrical circuit parameter at a predetermined value

US Patent 7450405 DC/AC converter with dampened LCL filter distortions

US Patent 7450407 Control method of AC/DC power converter for input current harmonic suppression

US Patent 7453234 Battery pack—cordless power device interface system

US Patent 7453243 Switching power supply with multiple output voltages and an intermittent oscillation pulse in standby

US Patent 7453246 Adaptive PWM pulse positioning for fast transient response

US Patent 7453251 Voltage tracking reference for a power regulator

US Patent 7453252 Circuit and method for reducing reference voltage drift in bandgap circuits

US Patent 7456617 System for controlling and monitoring an array of point-of-load regulators by a host

US Patent 7457137 Output sensor circuit for power supply regulation with main and switched outputs

US Patent 7460380 Highly efficient switching power converter using a charge pump to power the drive circuit

US Patent 7463014 High impedance current mirror with feedback

US Patent 7466571 Method and apparatus for adjusting wakeup time in electrical power converter systems and transformer isolation

US Patent 7468895 Method and system for providing a bias voltage for a power input sub-circuit of a switched mode power supply

US Patent 7471070 Switching power supply unit for generating an output voltage stepped up from an input voltage

US Patent 7471527 Green switch power supply with standby function and its IC

US Patent 7471530 Method and apparatus to reduce audio frequencies in a switching power supply

US Patent 7471531 Programmable feedback voltage pulse sampling for switched power supplies

US Patent 7474082 Voltage converting apparatus with auto-adjusting boost multiple

US Patent 7477046 Voltage regulator output stage with low voltage MOS devices

US Patent 7477531 Compensation circuit for use with a three-phase drive powering a single-phase load

US Patent 7482712 DC power supply with input voltage polarity indication

US Patent 7482791 Constant on-time regulator with internal ripple generation and improved output voltage accuracy

US Patent 7482793 Ripple generation in buck regulator using fixed on-time control to enable the use of output capacitor having any ESR

US Patent 7482796 Switching regulator, power supply circuit and secondary cell charging circuit including the same

US Patent 7483281 Multi-channel power converter with switching frequency modulation circuit for power saving

US Patent 7486062 Method and apparatus for trimming current limit and frequency to maintain a constant maximum power

US Patent 7492142 DC chopper and method for operating a DC chopper

US Patent 7495424 Overload compensation circuit with improved recovery response for a power supply

US Patent 7495939 Ripple filter circuit

US Patent 7498789 Switching regulator with over-current protection

US Patent RE40656 Primary-side controlled flyback power converter

US Patent 7501805 Circuit and method for soft start from a residual voltage

US Patent 7504806 Apparatus and methods for controlling operation of a single-phase voltage regulator in a three-phase power system

US Patent 7504814 Current generating apparatus and feedback-controlled system utilizing the current generating apparatus

US Patent 7505288 DC converter with independently controlled outputs

US Patent 7508687 Power supply that reads power requirement information across a DC power cord from a load

US Patent 7508688 Method and arrangement for measuring output phase currents of a voltage source inverter under a load

US Patent 7515444 Converter with selective current mode and voltage mode controlled switching

US Patent 7518345 Device for converting a continuous supply voltage into a continuous output voltage and corresponding electronic circuit

US Patent 7518890 AC/DC/AC converter with reduced inductance in the DC filter capacitors

US Patent 7518894 Distributed power supply system having reassignable master

US Patent 7518896 Phase control system for switching power supply pre-regulator allows increased power transformer leakage inductance

US Patent 7535734 High power-factor AC/DC converter with parallel power processing

US Patent 7535735 Compensation for parameter variations in a feedback circuit

US Patent 7535737 AC/AC multiple-phase power converter configured to be mounted on a substrate

US Patent 7535740 Electronic apparatus and power circuit having reduced switching loss

US Patent 7538528 Constant power foldback mechanism programmable to approximate safe operating area of pass device for providing connection to load

US Patent 7541787 Transistor drive circuit, constant voltage circuit, and method thereof using a plurality of error amplifying circuits to effectively drive a power transistor

US Patent 7545126 Controller for sensing a heavy load and a short circuit of low dropout regulators

US Patent 7545130 Non-linear controller for switching power supply

US Patent 7551459 Zero voltage switching coupled inductor boost power converters

US Patent 7551464 Current overloading proof switch power supply and its IC

US Patent 7554314 Current mirror circuit for reducing chip size

US Patent 7557547 Self exited oscillation converter providing a stable output voltage from a wide range of input voltages

US Patent 7557548 Safety barrier device employing an overload protection circuit for limiting current or voltage or current and voltage

US Patent 7557549 Automatic output mode select for an actuator controller

US Patent 7557552 Adaptive DC to DC converter system using a combination of duty cycle and slew rate modulations

US Patent 7560913 Input-tracking, automatic output-margining method and system

US Patent 7561452 Transformer-isolated flyback converters and methods for regulating output current thereof

US Patent 7564704 Method of forming a power supply controller and structure therefor

US Patent 7564705 Synchronous rectification circuit for power converters

US Patent 7570498 Switching power supply apparatus for correcting overcurrent detection point based on gradient of switching current

US Patent 7576522 Circuit and method for soft start of a switching regulator from a residual voltage

US Patent 7576524 Constant voltage generating apparatus with simple overcurrent/short-circuit protection circuit

US Patent 7577009 PWM cycloconverter and control method for PWM cycloconverter

US Patent 7579813 Power regulator having a voltage regulator module and having a voltage buffer module to provide a constant voltage output

US Patent 7583523 Three phase inverter control circuit detecting two phase currents and deducting or adding identical ON periods

US Patent 7586764 Synchronized rectifier filter control device for protecting a power supply from reverse current

US Patent 7586768 Electric power conversion apparatus for plural DC voltage sources and an AC electrical load

US Patent 7589510 Voltage regulator having variable threshold voltage switch

US Patent 7589982 Synchronous rectifier forward converter with reverse current suppressor

US Patent 7589984 Method for starting pulse width modulation

US Patent 7592787 Adaptive firing order control for dynamic current balance of multiphase voltage regulators

US Patent 7595624 Slope compensation for switching regulator

US Patent 7598715 Apparatus and method for reverse current correction for a switching regulator

US Patent 7599196 Universal power converter

US Patent 7599204 Control scheme providing a freewheeling period in a cyclo-converter and a high frequency inverter

US Patent 7602156 Boost converter

US Patent 7602625 Systems and methods for separation of a front end rectifier power system

US Patent 7612543 Current mode PWM boost circuit and feedback signal sensing method thereof

US Patent 7612547 Series voltage regulator with low dropout voltage and limited gain transconductance amplifier

US Patent 7615979 Flexible power converter and simplified process controller

US Patent 7616461 Control method and circuit with indirect input voltage detection by switching current slope detection

US Patent 7623361 Power supply soft start controller with no output voltage undershoot when transitioning from skip cycle mode to normal mode

US Patent 7626838 Inverter circuit with switching deadtime synchronized sample and hold current detection

US Patent 7630219 DC to DC converter for decreasing switching loss according to the turn-on/turn-off state of a switch

US Patent 7633274 Step-up switching power supply with open-circuit malfunction response

US Patent 7633277 System and method for testing worst case transients in a switching-mode power supply

US Patent 7633770 Collection and transmission system

US Patent 7633780 Switching power supply apparatus with low loss synchronous rectification

US Patent 7635968 Techniques for handling low line voltage Conditions in power supply units

US Patent 7635971 DC-DC converter and power supply device capable of synchronizing frequencies of a plurality of DC-DC converters

US Patent 7636247 Electronic circuit control element with tap element

US Patent RE41061 High efficiency linear regulator

US Patent 7638994 Switching power supply circuit

US Patent 7639517 Adaptive output current control for switching circuits

US Patent 7642787 Automotive vehicle electrical system diagnostic device

US Patent 7643314 Resonant switching power source having first and second switching elements connected in series to a DC power source

US Patent 7643315 Programmable feedback voltage pulse sampling for switched power supplies

US Patent 7649346 Switching regulator having a normal operational mode and a light-load operational mode

US Patent 7649404 Independent thresholds for power supply control circuitry

US Patent 7652899 Switching sequence control method for a PS-ZVT bridge converter

US Patent 7656685 Control method and circuit with indirect input voltage detection by switching current slope detection

US Patent 7656689 Power converter and control method for a power converter using serially-connected DC power sources

US Patent 7659702 Buck topology allowing step-up and polarity change

US Patent 7660138 Method for operating an inverter including boos, buck, and CUK converter topologies and arrangement for executing the method

US Patent 7667449 Constant current supply circuit capable of being trimmed

US Patent 7668607 Accurately setting parameters inside integrated circuits using inaccurate external components

US Patent 7672148 Controller and method for frequency-varying control of power converter

US Patent 7675279 Switching regulator soft start circuitry using a D/A converter

US Patent 7675282 Dual mode chip card voltage regulation circuit and method

US Patent 7679348 Switching regulator

US Patent 7679944 Motor drive

US Patent 7688043 Reactive-power control apparatus and reactive-power compensator using the same

US Patent 7688052 Charge pump circuit and method therefor

US Patent 7692418 Band gap reference circuit and temperature information output apparatus using the same

US Patent 7696739 Electronic switch circuit, converter and method of operation

US Patent 7701187 DC converter with halt mode setting means

US Patent RE41270 Semiconductor integrated circuit with selectable power supply according to different operation modes

US Patent 7710082 Controller for the three-phase cascade multilevel converter used as shunt active filter in unbalanced operation with guaranteed capacitors voltages balance

US Patent 7710088 Switching regulator with an adjustable output regulator circuit and a constant output regulator circuit

US Patent 7710089 Automatic configuration for linear mode of switching power supply

US Patent 7714562 Hysteretic switching regulator

US Patent 7719251 Enhancement of power conversion efficiency using dynamic load detecting and tracking

US Patent 7719865 Power conversion apparatus

US Patent 7728567 Current mode pulse frequency modulation switching regulator

US Patent 7728568 Power supply circuit and switch drivers

US Patent 7728571 Load-dependent frequency jittering circuit and load-dependent frequency jittering method

US Patent 7733072 Step-down/step-up DC/DC converter apparatus and method with inductor current threshold value adjusting

US Patent 7733073 Current regulator with current threshold dependent duty cycle

US Patent 7733670 Bidirectional active power conditioner with DC/AC inverter in low-frequency switching

US Patent 7733673 Method and apparatus to reduce audio frequencies in a switching power supply

US Patent 7733674 Power conversion apparatus for converting direct current to polyphase alternating current

US Patent 7733678 Power factor correction boost converter with continuous, discontinuous, or critical mode selection

US Patent 7737669 Hierarchical control for an integrated voltage regulator

US Patent 7741820 Switching voltage regulator pulse width modulation controller and method

US Patent 7741823 Linear voltage regulator with improved large transient response

US Patent 7742321 Measurement of the current of a frequency converter

US Patent 7755337 Current sensing circuit and voltage regulator using the same

US Patent 7755338 Voltage regulator pole shifting method and apparatus

US Patent 7755342 Multi-mode switching control circuit and method for improving light load efficiency in switching power supplies

US Patent 7759911 Switching regulator with reverse current detecting transistor

US Patent 7759914 Method and apparatus for power conversion and regulation of two output voltages

US Patent 7760520 Current controlled switching mode power supply

US Patent 7760524 Method and apparatus to reduce the volume required for bulk capacitance in a power supply

US Patent 7764520 Method and apparatus for on/off control of a power converter

US Patent 7764521 Apparatus and method for providing multiple functions and protections for a power converter

US Patent 7764522 Circuit and method for controlling the start-up cycle of a power supply

US Patent 7764524 Inverter for driving a load including a capacitive element in an input stage

US Patent 7772820 Feedback and comparison apparatus and DC-DC voltage converter

US Patent 7772825 Current source providing large supply current

US Patent 7773392 Isolated switching power supply apparatus

US Patent 7777465 Output transient responsive voltage regulator controlling apparatus and method

US Patent 7778045 Universal power conversion methods

US Patent 7782027 High-efficiency DC/DC voltage converter including down inductive switching pre-regulator and capacitive switching post-converter

US Patent 7782029 Method and system for controlling and monitoring an array of point-of-load regulators

US Patent 7782635 DC converter with independently controlled outputs

US Patent 7782636 RV converter with current mode and voltage mode switching

US Patent 7786712 High-efficiency DC/DC voltage converter including up inductive switching pre-regulator and capacitive switching post-converter

US Patent 7787270 DC-DC and DC-AC power conversion system

US Patent 7791320 Voltage regulator for use in nonvolatile semiconductor memory

US Patent 7791322 Economical high voltage DC to low voltage DC converter

US Patent 7791323 DC-DC converter utilizing respectively separate low-pass filters in feedback control and output voltage smoothing and method of designing the DC-DC converter

US Patent 7791904 Inductance-voltage clamping full-bridge soft-switch circuit

US Patent 7791910 Flyback converter with synchronous rectifier capable of reducing power loss

US Patent 7795849 Synchronous rectification switching regulator, control circuit for synchronous rectification switching regulator, and control method for synchronous rectification switching regulator

US Patent 7795850 Analog current command and settable slopes in voltage regulator

US Patent 7795852 Apparatus and method for adjusting working frequency of voltage regulator down circuit (VRD) by detecting current

US Patent 7800348 Motor drive with VAR compensation

US Patent 7800921 DC/DC converter

US Patent 7800924 Power converter apparatus and methods using neutral coupling circuits with interleaved operation

US Patent 7804284 PSRR regulator with output powered reference

US Patent 7804287 Low heat dissipation I/O module using direct drive buck converter

US Patent 7808802 Isolated switched-mode power supply with output regulation from primary side

US Patent 7808803 Inverter circuit with transformer having balanceable input currents

US Patent 7812579 High-efficiency DC/DC voltage converter including capacitive switching pre-converter and up inductive switching post-regulator

US Patent 7812580 Power supply apparatus having switchable switching regulator and linear regulator

US Patent 7812581 Pulse adding scheme for smooth phase dropping at light load conditions for multiphase voltage regulators

US Patent 7813148 Power converter having flux bias regulation method

US Patent 7817449 Power supply apparatus for attenuating noise

US Patent 7817451 Switch gear cell and converter circuit for switching a multiplicity of voltage levels with a switchgear cell such as this

US Patent 7821243 DC/DC converter

US Patent 7821800 Power adapter for providing output power limiting and load-dependent voltage regulation

US Patent 7821802 Control method for direct power converter

US Patent 7830687 Adaptive power electronics interface for hybrid energy systems

US Patent 7834602 Feedback power control system for an electrical component

US Patent 7839125 Apparatus and method for optimization of power flow control between different paths of a high voltage network in dependence of a disturbance in the network

US Patent 7843176 Apparatus and method for improved power flow control in a high voltage network

US Patent 7843179 Control circuit for synchronous rectifier-type DC-DC converter, synchronous rectifier-type DC-DC converter and control method thereof

US Patent 7843186 Switching regulator having high speed response

US Patent 7843707 Non-contact power supply having built-in coupling detection device and coupling detection method thereof

US Patent 7843711 Switching transistor driver circuit controlling power supply to the load

US Patent 7847527 Apparatus and method for improved power flow control in a high voltage network

US Patent 7847531 DC/DC converter with adaptive drive voltage supply

US Patent 7852050 Apparatus and method for simultaneous provision of power flow control in a three-phase AC transmission line

US Patent 7852061 Band gap generator with temperature invariant current correction circuit

US Patent 7852645 Circuit and associated method for reducing power consumption in a power transformer

US Patent 7852646 Instantaneous load current control scheme for voltage fed DC to AC inverter supplying resistive-inductive load

US Patent 7852647 Switching power supply digital control circuit protecting from magnetic saturation effects

US Patent 7852649 Power supply with a feedback circuit relieving spikes

US Patent 7852650 Selectable line voltage inverters and associated methods

US Patent 7859232 Apparatus and method for improved power flow control in a high voltage network

US Patent 7859868 Synchronous rectifier control circuit with deadtime adjustment to prevent crossover conduction

US Patent 7863876 Built-in self-calibration (BISC) technique for regulation circuits used in non-volatile memory

US Patent 7863882 Bandgap voltage reference circuits and methods for producing bandgap voltages

US Patent 7864549 Zero voltage switching coupled inductor boost power converters

US Patent 7868600 Adaptive PWM pulse positioning for fast transient response

US Patent 7869232 Electric power converter suppressing output voltage variation due to input voltage fluctuation

US Patent 7869235 Flyback converter having an active snubber

US Patent 7872879 Switched mode power converter and method of operation thereof

US Patent 7876073 Switching regulator with slope compensation and control method therefor

US Patent 7876076 Circuit for preventing through current in DC-DC converter

US Patent 7876080 Power converter with monotonic turn-on for pre-charged output capacitor

US Patent 7876081 DC-DC converter with substantially constant on-time and constant switching frequency

US Patent 7876586 Multi-pulse rectifier for AC drive systems having separate DC bus per output phase and multiple isolation transformers

US Patent 7880458 Method and device for driving power converters

US Patent 7881082 Power conversion apparatus and method of controlling the same

US Patent 7884588 Control method and device for a system of interleaved converters using a designated master converter

US Patent 7884589 Controllable power supply device with step-up function

US Patent 7885084 Control circuit for synchronous rectifying and soft switching of power converters

US Patent 7888917 Systems and methods for producing a substantially constant output voltage in a power source boost system

US Patent 7893667 PWM power supply apparatus having a controlled duty ratio without causing overall system oscillation

US Patent 7894218 Switch-mode converter

US Patent 7898780 Electronic differential switch

US Patent 7898832 RV converter with current mode and voltage mode switching

US Patent 7902809 DC/DC converter including a depletion mode power switch

US Patent 7903436 Smart blanking circuit for synchronous rectification in a switched mode power supply

US Patent 7903438 DC-AC converter with fast response speed

US Patent 7903439 Methods and apparatus to control a digital power supply

US Patent 7903440 Synchronous regulation circuit and method for providing synchronous regulation for power converters

US Patent 7903442 Apparatus and methods for power conversion

US Patent 7906941 System and method for estimating input power for a power processing circuit

US Patent 7911189 Input regulated DC to DC converter for power scavenging

US Patent 7916507 High voltage electron tube inverter with individual output phase current control

US Patent 7919953 Solar power capacitor alternative switch circuitry system for enhanced capacitor life

US Patent 7920393 Four pole neutral-point clamped three phase converter with low common mode voltage output

US Patent 7928704 Droop circuits and multi-phase DC-DC converters

US Patent 7928705 Switched mode voltage converter with low-current mode and methods of performing voltage conversion with low-current mode

US Patent 7928706 Low dropout voltage regulator using multi-gate transistors

US Patent 7928712 Low noise fast dithering switching power supply

US Patent 7932705 Variable input voltage regulator

US Patent 7932707 Voltage regulator with improved transient response

US Patent 7936575 Synchronous rectifier control using load condition determination

US Patent 7940537 Partial regeneration in a multi-level power inverter

US Patent 7944715 Controller for use in a resonant direct current/direct current converter

US Patent 7944722 Switch mode power supply controller with feedback signal decay sensing

US Patent 7956597 Reference buffer circuits for providing reference voltages

US Patent 7965065 Trimming circuit

US Patent 7965523 Switching power supply device

US Patent 7965524 Method and apparatus to reduce audio frequencies in a switching power supply

US Patent 7969127 Start-up circuit for a shunt regulator

US Patent 7969752 Switching power supply device using current sharing transformer

US Patent 7973518 Low noise voltage regulator

US Patent 7977927 Step-up DC/DC voltage converter with improved transient current capability

US Patent 7978485 Thyristor power control circuit with damping circuit maintaining thyristor holding current

US Patent 7982443 DC to DC voltage converter with stacked synchronous buck converters

US Patent 7982446 Power supply circuit with dynamic control of a driver circuit voltage rail

US Patent 7986535 Methods and apparatus for a cascade converter using series resonant cells with zero voltage switching

US Patent 7990118 Switching regulator with high efficiency in light load mode

US Patent 7994768 Control apparatus and method of senseless MPPT control for photovoltaic power generation system

US Patent 7995359 Method and apparatus for implementing an unregulated dormant mode with an event counter in a power converter

US Patent 8009450 Method and apparatus for phase current balance in active converter with unbalanced AC line voltage source

US Patent RE42674 Control method and circuit with indirect input voltage detection by switching current slope detection