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5841645 Multi-level inverter with low loss snubbing circuits  
A multi-level inverter, including an AC output terminal, at least four DC input terminals with different potentials having a first DC input terminal with a maximum potential and a second DC input...
5835371 Bridge type power converter  
A bridge-type power converter has, in each phase, a inductor (L1) connected between a connection point of said two switching elements (Q1, Q2) and an output terminal; capacitors (C1, C2) connected...
5828559 Soft switching active snubber  
A soft switching device for electric power switching applications includes a switching element and a soft switching active snubber. The soft switching active snubber includes a capacitor, a...
5818180 Voice coil motor feedback control circuit  
A circuit for driving a voice coil motor used to position the heads of a disk drive is disclosed. The circuit consists of a an H-bridge circuit, a controller, and a feedback loop. The feedback loop...
5815391 Current sensing circuit for pulse width modulated motor drive  
Inverter-switch currents are sensed using a conventional a-c current transformer whose primary winding is connected to the inverter-switch and whose secondary winding is connected to a...
5815381 Single-barrier closed loop DC-to-DC converter and method  
A DC to DC converter repeatedly divides a first digital signal (26) into 8 time frames, and repeatedly generates a second digital signal (VS) during one of the 8 time frames. A DC input signal...
5808884 Circuit and method for conserving energy in a boost regulator circuit  
A boost regulator circuit includes a rechargeable power supply Vcc, an energy storage component 22 coupled to the rechargeable power supply, a load CL, and a bi-directional drive means (S1-S6, 20...
5805438 Current controlled PWM inverter for driving a motor without gain adjustment  
A low-cost, completely adjustment-free current-controlled PWM inverter substantially solving the conventional problems associated with the gain adjustment of a current error amplifier is provided....
5801936 Semiconductor module for a power conversion device  
An inverter device includes plural modules, each module being formed by a series circuit having a parallel circuit of a first switching device and a first diode, and a parallel circuit of a second...
5793621 Switching power supply for computer-driven displays or the like  
A power supply system has a switching element to be turned on and off for d.c. to d.c. conversion of a unidirectional supply voltage in synchronism with horizontal synchronizing pulses used for...
5784270 Method of controlling an H-bridge  
Controlling an H-bridge of switches, characterized in that during a cycle, the current takes a peak value of constant sign during a continuous portion corresponding to a cycle fraction equal to...
5780975 Low cost inverter with both discrete and integrated power switches  
An inverter for powering an electroluminescent lamp includes a supply terminal, a ground terminal, a first switching transistor, an inductor, and a second switcing transistor connected in series...
5781419 Soft switching DC-to-DC converter with coupled inductors  
A DC-to-DC converter topology is provided having switching devices that are switched under zero voltage switching conditions to minimize switching losses. The converter of the present invention...
5781418 Switching scheme for power supply having a voltage-fed inverter  
A power supply is disclosed which includes a resonant circuit, and a voltage-fed inverter producing an applied voltage at an output coupled to the resonant circuit, the inverter responsive to a...
5777864 Resonant converter control system having resonant current phase detection  
A resonant convertor control system regulates a resonant AC current based on the amount of input power consumed by the system. The switching frequency and resonant AC current are limited by a phase...
5773799 High-frequency induction heating power supply  
A high-frequency power supply which is primarily intended for use with an inductive heating apparatus. The high-frequency power supply has a pre-regulator for emitting a constant output voltage, an...
5774351 Series resonant DC-to-AC inverter system  
A series resonant DC-to-AC inverter. This inverter comprises a series-resonant circuit including a resonant capacitor and a resonant inductor, a diode parallel with the series resonant circuit, a...
5774346 Family of zero voltage switching DC to DC converters with coupled output inductor  
A family of power converter is invented. Each of these converter accomplishes zero voltage switching to minimize switching losses. Also by the application of coupled inductor, conduction losses can...
5774345 Switching power supply with surge current and surge voltage prevention  
A direct current output voltage is switched by two switching units and a current alternately changing directions is supplied to a primary winding of a transformer. An alternating voltage induced in...
5771166 Asymmetrical bridge inverter circuit for driving a switched reluctance motor  
An inverter circuit for a switched reluctance motor (SRM) includes a lower switching transistor connected to a corresponding lower negative pole of a filter condenser and switched in accordance...
5767653 Variable speed AC induction motor controller  
A circuit for powering a two-phase AC induction motor. The circuit generates a first signal of the form Vdc+A sin(2πft-0°) and a second signal of the form Vdc+A sin(2πft-90°). The first signal is ...
5768112 Sub-resonant series resonant converter having improved form factor and reduced EMI  
An improved sub-resonant converter which retains the advantages generally associated with simple series resonant converters while additionally providing improved form factor and efficiency, and...
5768113 High power and high voltage power supply including a non-resonant step-up circuit  
A high power and high voltage power supply is capable of charging one or more capacitors to high voltage. The power supply includes a current rectifier circuit for connecting to an AC source, a...
5764500 Switching power supply  
A switching power supply (30) uses a transformer 37 having a first primary winding (38A) and a second primary winding (38B) wrapped around the same core (52, 53) but wrapped around opposite sides...
5764494 Saturable reactor and converter for use thereof  
A switching converter achieves improved regulation range by the use of a saturable reactor in series with a transformer primary. The saturable reactor uses a conventional magnetic pot core...
5761056 Circuit for protecting fluorescent lamp from overload  
A circuit for protecting a fluorescent lamp from overload is disclosed, including a pulse voltage generator for generating a pulse voltage from a smoothed DC; a driver for accepting the pulse...
5760495 Inverter/charger circuit for uninterruptible power supplies  
A power supply for generating an uninterruptible AC power signal. The power supply utilizes leakage inductance in its transformer to eliminate the need for an output inductor. In standby mode, the...
5757626 Single-stage, single-switch, islolated power-supply technique with input-current shaping and fast output-voltage regulation  
A new single-stage, single-switch, input-current-shaping technique which combines the boost-like input-current shaper with a continuous-conduction-mode dc/dc output stage is described. Due to the...
5757636 Multi-phase inverters utilizing discontinuous PWM with dead bands  
A drive circuit for a three-plane load (7) includes an inverter bridge consisting of six bridge switches (T1 to T6), a modulation generator (6) which controls switching of the inverter bridge (4)...
5748456 Power semiconductor module system  
A power semiconductor module system includes a plurality of types of power semiconductor modules (310), which each contain one or more controllable power semiconductors (36, 37) and are each...
5748458 AC/DC converter power supply circuit having multiple rectifiers  
An AC/DC converter power supply circuit includes an AC power supply source, a first rectifier for full-wave rectifying the AC power supply source voltage, a second rectifier for further rectifying...
5748459 Electric leakage current prevention using an equivalent impedance  
An electric leakage preventive apparatus comprises an equivalent impedance which is equivalent to a load leakage impedance of a load in a main body; a switching unit for applying voltage to the...
5737207 Power supply  
A power supply apparatus has a rectifier for outputting a non-smoothed DC. A switching circuit alternately shut off output of the rectifier at a high frequency, which includes first and second...
5737200 Semiconductor device protection method  
Semiconductor devices operating as switching elements for a power converter are protected in the invention. Each pair has upper and lower arms and is connected in series between electrodes of a DC...
5737205 Semiconductor static electric power converter optimized for operation in zero-voltage mode  
The invention relates to static electric power conversion using semiconductors using soft switching in zero-voltage mode and controlled to perform pulse width modulation, having a first interface...
5734565 Reducing switching losses in series connected bridge inverters and amplifiers  
A staggered-frequency AC inverter includes at least first and second pulse width modulated bridge circuits connected in series. The first bridge circuit receives a DC voltage and operates at a...
5731689 Control system for A.C. generator  
An exciting current controlling transistor or a high-side switch or low-side switch of a three-phase full-wave rectifier for an on-vehicle a.c. generator is formed of a MOS power transistor made of...
5731970 Power conversion device and semiconductor module suitable for use in the device  
An inverter device includes plural modules, each module being formed by a series circuit having a parallel circuit of a first switching device and a first diode, and a parallel circuit of a second...
5729450 Power converter with ripple current and bulk filtering supplied by high-current, high-microfarad film capacitor arrangement  
In a power inverter, ripple current and bulk filtering are provided by a high-current, high-microfarad film capacitor arrangement; there is no separate snubber capacitor section. In an alternative...
5723913 High-voltage electronic switching circuit  
A high-voltage switching circuit is formed of a series combination of switches, each of which is rated for use at a voltage lower than that of the power supply. The switches are connected in series...
5719759 DC/AC converter with equally loaded switches  
A circuit arrangement comprises an inverter with two parallel switching branches which are connected to a DC voltage source and each of which comprises two series-connected switching members, each...
5719758 Inverter control method and inverter apparatus using the method  
A pulse width of a pulse train signal used for PWM (pulse width modulation) control is monitored. When a variation of the pulse width substantially disappears within a specified time, it is...
5717585 Power inverter with reduced switching frequency  
An inverter system (10) in accordance with the invention includes an electrical load (R,L) having a direct current source (E) for providing direct current to at least one pair of inverter switches...
5717584 Quasi-resonant pole inverter  
A quasi-resonant pole inverter provides soft-switching of the main inverter switch devices only when such opportunities are required by the pulse width modulation control. The inverter includes a...
5715150 Inverter output circuit  
In an inverter power supply with an output transformer including a core of magnetically permeable material with an effective area, a primary winding on the core and a secondary output winding on...
5715155 Resonant switching power supply circuit  
The resonant switching power supply circuit comprises positive and negative DC input terminals. First and second switching elements are connected in series between the DC input terminals. Each...
5712536 Reduced bus voltage integrated boost high power factor circuit  
A condensed power supply circuit for powering a gas discharge lamp with bi-directional current reduces duty cycle by increasing dead time. The circuit comprises an arrangement for supplying d.c....
5710696 Controllable converter power supply  
In accordance with the present invention a power supply for providing an ac/dc output to a load is disclosed. The power supply includes a first source of dc power and an inverter that provides an...
5710698 Delta connected resonant snubber circuit  
A delta connected, resonant snubber-based, soft switching, inverter circuit achieves lossless switching during dc-to-ac power conversion and power conditioning with minimum component count and...
5710699 Power electronic interface circuits for batteries and ultracapacitors in electric vehicles and battery storage systems  
A method and apparatus for load leveling of a battery in an electrical power system includes a power regulator coupled to transfer power between a load and a DC link, a battery coupled to the DC...