Patents for H02M 5 - Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases (13,094)
08/1991
08/06/1991US5038244 Device for overvoltage protection of a rectifier bridge feeding a d.c. motor and for control of the d.c. motor during emergency braking
08/06/1991US5038081 Reverse phase-controlled dimmer
07/1991
07/30/1991US5036448 DC to AC inverter and method for producing three phases from two input phases
07/30/1991US5036234 Control circuit for triacs
07/24/1991CN2081623U Improved touching stepless adjusting table lamp
07/24/1991CN2081586U Multi-functional light-adjusting speed-regulating electronic socket
07/24/1991CN1013332B Controller of pulsewidth modulation inverter by using micro processor
07/23/1991US5034669 Regenerative circuit for motor drive system having leakage current compensation
07/23/1991CA1286716C Reactive power processing circuit for a current source gto inverter
07/17/1991EP0436665A1 Variable speed, constant frequency generating system with input transformer
07/09/1991US5030890 Two terminal incandescent lamp controller
07/03/1991EP0434889A2 Inverter and power supply systems including same
07/03/1991CN2080284U Touch type light-adjusting switch with display
07/02/1991US5029062 Electrical regulation and energy transfer circuit
06/1991
06/27/1991WO1991009411A1 Variable power drive circuit
06/27/1991DE4037390C1 Voltage supply for inverter controller - has intermediate circuit connected via power Zener diodes and isolation diodes
06/26/1991EP0433966A1 Method and circuiting for driving a plurality of triacs
06/26/1991CN2079815U Controllable voltage regulating socket board for power supply
06/26/1991CN2079770U Clock controlled multifunctional socket
06/23/1991CA2032917A1 Method and circuit for gating plural triacs
06/19/1991CN2079365U Multi-purpose silicon-adjustable voltage-adjusting energy-saving socket box
06/19/1991CN2079363U Power adjustable inseting connector
06/18/1991US5025134 Means for refreshing a triac control circuit power supply
06/18/1991CA1285047C Apparatus for stabilizing turbine-generator shaft torsional oscillations
06/12/1991EP0431063A1 Notch cutting circuit with minimal power dissipation
06/12/1991CN1052227A Voltage regulator with ordinary switch for regulation and method thereof
05/1991
05/28/1991US5019766 Method and apparatus for improving performance of AC machines
05/23/1991DE4032410A1 Electrical light supply - has voltage reduced by diode, inductance or thyristor circuit to improve operational life
05/22/1991EP0428035A2 Three-phase cycloconverter
05/21/1991WO1991007807A1 Dc/dc power transformer
05/21/1991US5018058 High frequency AC voltage control
05/21/1991US5017857 Circuit and method for voltage regulation of electric power sources
05/21/1991US5017800 AC to DC to AC power conversion apparatus with few active switches and input and output control
05/15/1991EP0427709A2 Power control circuit
05/14/1991US5016157 VSCF system with DC link harmonics control
05/14/1991CA1284178C Switching ac voltage regulators
05/02/1991WO1991006047A1 Reverse phase control switching circuit and method without zero crossing detection
04/1991
04/23/1991US5010471 Three-phase AC-to-AC series resonant power converter with reduced number of switches
04/18/1991DE3934400A1 AC-DC-AC inverter operation for three=phase motor supply - involves two thyristor inverters switched from sinusoidal phase current mode to indirect mode at transitional speed
04/11/1991DE3933525A1 Inverter-fed motor excitation with isolated stator windings - involves switching between direct and indirect operations at different phases of sinusoidal cycle for separate inverters
04/11/1991DE3933524A1 Inverter-fed motor operation with isolated stator windings - allows direct inverter operation at low speeds with quadrature sinusoidal currents from independent-fired thyristor bridges
04/11/1991DE3933522A1 Frequency-dependent operation of parallel three=phase inverters - involves switching to indirect inverter operation at higher machine frequencies when one bridge current is zero
04/11/1991DE3933520A1 Frequency-dependent operation of parallel three=phase inverters - involves switching to indirect inverter operation at higher machine frequencies by change of thyristor firing pattern
04/10/1991EP0421534A1 Circuit arrangement for power supply to a load
04/10/1991EP0420901A1 Procedure and apparatus for the control of electric power.
04/09/1991US5006973 Autotuned resonant power source
04/05/1991WO1991005401A1 Process and device for adjusting and controlling a.c. voltages from the public mains
04/05/1991CA2042589A1 Process and device for adjusting and controlling a.c. voltages from the public mains
04/04/1991DE4007579C1 Low current control circuitry for thyristor setter - discharges capacitor to trigger dials via current regulating stages working practically independent of supply voltage
04/03/1991EP0420628A2 AC to DC to AC power conversion apparatus with few active switches and input and output control
04/03/1991EP0419656A1 Speed controller
04/02/1991US5005115 Forced-commutated current-source converter and AC motor drive using the same
04/02/1991US5005113 Hybrid circuit module having bridge circuit and rectifying circuit disposed on a same substrate
04/02/1991US5004969 Phase control switching circuit without zero crossing detection
03/1991
03/30/1991CA2025847A1 Ac to dc to ac power conversion apparatus with few active switches and input and output control
03/27/1991EP0418832A2 Control method and apparatus
03/27/1991EP0418332A1 Low distortion control for a vscf generating system
03/27/1991CN1012245B Industrial-frequency phase transformer
03/21/1991WO1991003869A1 Variable speed ac drive control
03/20/1991EP0417805A1 Control method and device for AC motor
03/20/1991CN2073629U Three phases capacity type of constant current rectificating device
03/14/1991WO1991004606A1 Regulated ac power system energized by variable speed prime mover
03/13/1991EP0416050A1 A device with a multi-phase load, a static converter and choke coils.
03/13/1991CN2073191U A.c. silicon-controlled voltage regulator
03/12/1991CA1281370C Wall box dimmer switch with plural remote control switches
03/06/1991CN2072745U Voltage regulator
03/06/1991CN2072744U Alternating-current voltage regulator
03/06/1991CN1049759A Technology for increasing electric power of electric appliance
02/1991
02/19/1991CA1280463C Apparatus for controlling power transducers of the pulse width modulation (pwm) control type
02/13/1991CN2071393U Voltage adjusting socket for electric heater
02/13/1991CN1049253A Voltage-type pwm converter/inverter system and process for controlling the same
02/13/1991CN1049252A Frequency-independent single-phase to three-phase ac power conversion
02/13/1991CN1011580B Controlling apparatus for alternating current elevator
02/12/1991US4992925 Converter with intermediate d.c. circuit
02/12/1991US4992920 Regulated AC power system energized by variable speed prime mover
02/12/1991US4992721 Inverter for starting/generating system
02/12/1991US4992718 Electric floor cleaner with a soft start function
02/06/1991CN2070967U Inphase vector voltage and current regulator
01/1991
01/30/1991EP0410866A1 Multioutput power converter
01/30/1991EP0410574A2 Adjustable AC power supply equipment for air-conditioner system
01/30/1991EP0410463A2 Voltage-type PWM converter/inverter system and method of controlling the same
01/23/1991CN2070058U Series-type intermediate frequency power supply made of thyristor
01/23/1991CN2070051U Energy-saving capacitance-type automatic charger
01/23/1991CN1011373B Arangement for high frequency link power conversion
01/16/1991EP0408534A2 Phase switched power controller
01/15/1991US4985819 AC-DC-AC apparatus having battery charging and discharging feature
01/09/1991CN1011172B Microcomputer system for controlling thyristor mid-frequency power source
01/08/1991US4983856 Method and system for interconnecting in quadrature two synchronous or asynchronous three-phase networks
01/03/1991DE3920812A1 Self-commutating thyristor regulator for rotary electrical machine - uses pairs of thyristors coupled in antiparallel to each network and each motor phase
01/02/1991EP0405653A2 Electric energy power converter of which commutation is aided by an active control of the supplying voltage of the voltage inverter circuit
01/02/1991EP0404926A1 Paralleling method and control for a vscf system
01/02/1991EP0404907A1 Three phase inverter power supply with balancing transformer
12/1990
12/25/1990USRE33504 Wall box dimer switch with plural remote control switches
12/20/1990DE3918809A1 Master-slave dimmer with opto-couplers and triacs - has series connection of controlling inputs overridden by fast-switching short-circuit protective thyristors gating arrangement
12/19/1990CN2067884U Remote-control stepless light regulating lamp
12/19/1990CN1010913B Ac frequency converter speed governing equipment and inverter circuit
12/18/1990US4979087 Inductive coupler
12/18/1990US4978894 Single phase to three phase rectifier/inverter with DC ripple compensation
12/12/1990EP0401339A1 Phase separation control
12/06/1990WO1990015471A1 Phase converter