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8094468 |
Control circuit having off-time modulation to operate power converter at quasi-resonance and in continuous current mode
A control circuit is developed to adaptively operate a power converter at quasi-resonance (QR) and in a continuous current mode (CCM) to achieve high efficiency. The control circuit includes a PWM...
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8022672 |
Charger control circuit and charger control method
The present invention discloses a charger control circuit and a charger control method for controlling a charger having a transformer, the transformer including a primary winding and a secondary...
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7940537 |
Partial regeneration in a multi-level power inverter
In one embodiment, the present invention includes a medium voltage drive system having multiple power cells each to couple between a transformer and a load. A first subset of the power cells are...
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7848126 |
Integrating current regulator and method for regulating current
Current regulators and related method for regulating a current through a load. The current regulator may include, for example, a first circuit configured to determine an amount of current that...
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7728538 |
Method and related device for estimating the currents flowing in windings of a poly-phase electrical load at a certain instant
There is a method of estimating values of winding currents, at an instant of a period, in a winding of a load, controlled in space vector modulation mode through symmetrical control phases. The...
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7710213 |
Method for voltage limitation in a transponder
A circuit for voltage limitation is provided in a transponder with a resonant circuit, which comprises at least one inductor, a capacitor, a depletion layer component with an input, output, and a...
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7688603 |
Arrangement for monitoring a frequency converter
An arrangement and method for monitoring a frequency converter, the frequency converter being a voltage-controlled PWM frequency converter provided with a control unit and having an uncontrolled or...
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7564194 |
Method for detecting lamp current and lamp driving circuit using the method for detecting the lamp current
A lamp driving circuit includes: a voltage supply part including a first voltage supply part and a second voltage supply part; a first circuit part including a first terminal, a second terminal and...
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7550951 |
Two-step battery charger
A two-step charger includes an AC/DC power supply, a transformer, a compensator, a controller, a comparator and an isolating controller. The comparator detects whether a battery is connected to the...
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7526366 |
Electrical power control system, and method for setting electric state variables and/or parameters in a current conductor
The invention is directed toward an electrical power control system (1) in an electrical power system, having: a power control unit (2) for setting electric state variables and/or parameters in a...
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7522435 |
Power supply converter/s with controller/s responsive to voltage, current, and power
Each of power supply units in a power supply system according to the present invention includes a power supply module, a voltage increase/decrease circuit for increasing the voltage across the...
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7518416 |
Method and apparatus for detecting switching current of magnetic device operated in continuous current mode
The present invention provides a method and apparatus for detecting a continuous current of a switching current. A current signal is produced in response to a switching current of the magnetic...
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7514956 |
Semiconductor device
A first and a second charging circuit each having a diode and a capacitor are connected to a buffer. In the first charging circuit, an overshoot based on a reflected signal generated by an output...
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7432473 |
Electrofusion machine with improved functions
A portable electrofusion machine includes: a power supply circuit having a triac configured to have a proper regulation for dropping a commercial voltage to a voltage adapted for a fitting; and a...
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7358712 |
Power supply control circuit and control method thereof
A power supply control circuit includes: a conducting part configured to be controllable in its a conducting amount for conducting a power supply current to a load circuit; a current change ratio...
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7271646 |
Loop powered process control instrument power supply
A loop powered process instrument comprises a control circuit measuring a process variable and developing a control signal representing the process variable. An output circuit for connection to a...
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7259542 |
System and method for controlling bidirectional three-phase DC/DC converter
Disclosed are an apparatus and method for controlling a Direct Current (DC)/DC converter which controls energy flow between a first DC source and a second DC source to eliminate a high-frequency...
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7176424 |
Induction heating cooking apparatus and method for operating the same
An induction-heating cooking apparatus and a method for operating the same are disclosed. Upon receiving a low-voltage signal in a high-output level state, the apparatus controls an output signal...
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6747882 |
Power conversion device
A power conversion device including, a power converter controlling a motor in variable speed control, first to second control circuits outputting first to second control signals, first to second...
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6700807 |
Flexible converter
The present invention is directed to a flexible converter. A flexible converter of the present invention may provide a desired output utilizing a variety of methods, systems and apparatus without...
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6580623 |
Flexible converter routing apparatus, system and method
The present invention is directed to a flexible converter suitable for providing a routing function. A flexible converter of the present invention may provide a desired output utilizing a variety...
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6515881 |
Inverter operably controlled to reduce electromagnetic interference
A lamp load control system that includes a lamp controller comprising an inverter generating an AC signal from a DC signal, a load coupled to the inverter, and a feedback circuit coupled to the...
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6504734 |
Switched power converter utilizing a piezoelectric transformer
The switched power converter comprises a first rectifier module (11-1) connected to a first capacitor (11-2) that, in turn, is connected to an excitation module (11-3) that applies a voltage to...
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6426887 |
Power control device, remote control receiving device and optical communication device with zero power consumption during standby
A remote control receiving device mounted on an apparatus has a switch circuit and an LED. The switch circuit is connected between a power supplied circuit of the apparatus and a power source. The...
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6424548 |
Power converter
The present invention relates to a bi-directional AC/DC converter having (i) a power stage, (ii) a sourcing control circuit and (iii) a recuperation control circuit. The converter operates with a...
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6333864 |
Power supply adjusting circuit and a semiconductor device using the same
A power supply adjusting circuit includes a reference voltage supplying part generating a reference voltage based on an external voltage, a plurality of internal voltage generating parts generating...
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6147885 |
Method and apparatus for controlling providing of conditioned AC power
A method and apparatus for controlling the providing of conditioned AC power, with the conditioned AC power being capable of being provided on a continuous basis. Unconditioned AC voltage is...
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6125048 |
Method and apparatus for adjusting power delivered from a central power unit to a remote unit via a supply cable
A power delivery apparatus and method which calibrates a voltage delivered from a central unit to a remote unit to compensate for losses in the supply lines between the central unit and remote unit...
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6108223 |
IGBT-controlled thyristor AC/DC converter
A hybrid diode/thyristor AC/DC converter includes a thyristor bridge (21) poled oppositely to a diode bridge (13), current through the thyristor bridge being controlled by IGBTs (30, 31). A...
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6094367 |
Voltage regulating device for dynamically regulating voltage in a computer system
The invention provides a voltage regulating device for regulating the operating voltage of a CPU in a computer system. The voltage regulating device includes a voltage identification signal...
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6021057 |
Inverter system
A converter system, in particular for supplying electrical drives with direct current or DC voltage, or with alternating current or AC voltage, at a specifically matched frequency or for dynamic...
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6005303 |
Linear voltage regulator compatible with bipolar and MOSFET pass devices and associated methods
A linear voltage regulator includes a pass device for supplying current to a load, and an error amplifier for generating a control signal for controlling the pass device for regulating an output...
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5956242 |
Switched-mode power supply having a sample-and-hold circuit with improved sampling control
A switched-mode power supply includes a transformer having a primary winding, a secondary winding and an auxiliary winding. A switching device is included in series with the primary winding for...
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5943227 |
Programmable synchronous step down DC-DC converter controller
An monolithic programmable dc--dc converter controller integrated circuit with a high speed synchronous controller and a 4-bit programmable DAC to provide an operating voltage to an external device...
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5886514 |
Piezoelectric transformer driving curcuit and method capable of stabilizing load current
In a piezoelectric transformer driving circuit which comprises a boosting circuit (2) for boosting an input direct current voltage, a piezoelectric transformer (3), a current voltage converting...
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5847950 |
Control system for a power supply
A power supply having a control system for permitting intelligent operation. The power supply: (i) is convenient, safe, and easy to program; (ii) is provided with a graceful shutdown in which...
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5790392 |
Intelligent power supply with staged loading capability
A power supply system includes a power distribution circuit (21) and a power converter circuit (22), an input power control circuit (24), a power utilization circuit (26) and a utilization control...
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5768117 |
Power supply system for supplying electric power to a load through plural converters
The invention relates to a power supply system having plural converters connected in parallel. The current of each of the plural converters is detected and each of the converters is controlled so...
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5764503 |
Method and apparatus for providing conditioned AC voltage using current and voltage sensing
A method and apparatus for controlling the providing of conditioned AC power, with the conditioned AC power being capable of being provided on a continuous basis. Unconditioned AC voltage is...
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5751118 |
Universal input dimmer interface
A universal input dimming circuit for coupling an isolated external control signal into a variable output power supply, particularly those used for driving fluorescent lamps. Circuitry is...
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5699236 |
High-voltage stabilization circuit of a monitor
A high-voltage stabilization circuit of a monitor can detect accurately a change of a high voltage of a secondary winding of a high-voltage transformer. The high-voltage stabilization circuit of a...
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5690849 |
Current control circuit for improved power application and control of thermoelectric devices
A current control circuit for improved power application and control of thermoelectric devices to maintain the temperature of thermoelectric devices at a set point. The circuit includes at least...
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5627740 |
Low dissipation current sensing system for a switched DC power supply
A system and method for measuring the load current in a power supply driven by switched transformer or the like. Rectified rectangular waveform input voltage pulses are interrupted to exhibit a...
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5508907 |
Chopper control apparatus
A chopper control apparatus including a measurement device which measures the mean value of an output magnitude of the chopper, and a regulator which controls the supply of control square-waves for...
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5452198 |
Apparatus and method for A/C voltage sensing
An apparatus and method for generating a sensing signal from a generally periodic AC signal. The apparatus includes a first integrating circuit (125) for generating a first integrated signal by...
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5450307 |
Switching power source apparatus
A switching power source apparatus for producing power signals. The apparatus includes a rectification circuit for rectifying received alternating voltage signals, a smoothing circuit for smoothing...
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5309349 |
Current detection method for DC to three-phase converters using a single DC sensor
A current detection method for a direct-current (DC) to three-phase alternating-current (AC) converter can utilize only a single DC sensor to detect and calculate the three-phase alternating...
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5285367 |
Linear load circuit to control switching power supplies under minimum load conditions
An embodiment of the present invention is a switching power supply comprising a transformer with a primary and two secondaries, a switching transistor in series with the primary, a rectifier and...
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4974140 |
Voltage stability discrimination system for power systems
A voltage stability discriminating system for a power system is disclosed for calculating a multiple load flow solution relating to a voltage stability discrimination for a power system in which...
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4935858 |
Auxiliary output regulation technique for power supplies
A regulation technique for regulating at least one auxiliary output of a power supply having a regulated main output. When the auxiliary output reaches a first or a second predetermined value, the...
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