|
Match
|
Document |
Document Title |
|
|
7187569 |
Signal generation apparatus and method for seafloor electromagnetic exploration
An apparatus for generating electronic signals for application in subsea electromagnetic exploration. A surface generated high-voltage low-current source signal stabilized at a first frequency is...
|
|
|
7050313 |
Aircraft AC-DC converter
An AC-DC converter includes a DC reference voltage generation unit that creates a DC reference voltage waveform based in part on a feedback signal. The AC-DC converter also includes an SCR firing...
|
|
|
6867570 |
Circuit arrangement for the static generation of a variable electric output
The novel circuit arrangement is used for the static generation of a variable electric output, as is common in static reactive-power compensation systems. According to the invention, a voltage is...
|
|
|
6587362 |
AC-DC converters with bi-directional thyristor valves
An ac-dc converter using bi-directional thyristor valves made up of back-to-back connected thyristors as converter valves. The bi-directional thyristor valves permit operation of the converter as a...
|
|
|
6552598 |
Semiconductor high voltage electrical energy transmission switching system and method
A method for controlling fault interruption in a high voltage electrical energy transmission system semiconductor high voltage electrical energy transmission switching system which includes a...
|
|
|
6388906 |
Backslope regulator system
A regulator system includes a circuit regulating the output of a power supply such as a capacitive input filter power supply and preferably also a transformer and full-wave diode bridge. Included...
|
|
|
6385066 |
Method and system for detecting a zero current level in a line commutated converter
A method and system for determining zero current level occurrences in a reversible power converter without requiring additional component complexity and costs. A digital controller selectively...
|
|
|
6377482 |
Device and method for line-voltage dependent thyristor controlled pre-charging of output capacitors in a three-level pulse rectifier system
The invention relates to an apparatus for initial charging of the output capacitors of a three-phase three-point pulsed rectifier system. According to the invention, a thyristor is arranged in each...
|
|
|
6362604 |
Electrostatic precipitator slow pulse generating circuit
An apparatus and method for generating slow rise-time, high voltage electrical pulses to a load, preferably using an existing transformer/rectifier set or power supply to charge an inversion or...
|
|
|
6108224 |
Phase shift triggering circuit for thyristor and an integrated module of the triggering circuit and the thyristor
A phase-shift thyristor trigger circuit, including a synchronous signal sampling circuit, a waveform shaping, integrating and comparator circuit, a high-frequency modulating pulse distributor...
|
|
|
6075717 |
PWM rectifier control with switching losses equally distributed among multiple switching devices
Switching losses are distributed equally between multiple switching devices in a rectifier bridge (50) in which the rectifier bridge comprises at least a first pair of serially connected switching...
|
|
|
6018473 |
Power supply and printing machine containing same
A power supply includes a diode bridge rectifier. The diode bridge rectifier output provides direct current to a primary capacitor. A current-limiting resistor is connected in series with the...
|
|
|
5995395 |
Control of a composite bridge at zero voltage
The present invention relates to a device for controlling a composite bridge including two anode-gate thyristors, the cathodes of which are connected together to a positive output terminal, the...
|
|
|
5986903 |
Control apparatus for a converter for transmitting electric power between an alternating voltage network and a direct voltage network
A plant for transmitting electric power between a direct voltage network and an alternating voltage network through a power station. A converter of a station has two current valves connected in...
|
|
|
5982646 |
Voltage clamp snubbers for three level converter
A three-level NPC converter includes at least one phase leg including four series coupled electrical switches having a first pair junction between the first two switches and a second pair junction...
|
|
|
5981925 |
Power supply for a continuous wave microwave magnetron
A power supply for a CW magnetron, devoted for use in microwave heating equipment. A power supply according to the present invention (FIG. 1) has a high-voltage line transformer (1) with secondary...
|
|
|
5969959 |
Converter circuit arrangement with protection circuit
A converter circuit arrangement is specified having a rectifier, an intermediate circuit and an invertor connected thereto. In order to protect the circuit against failures and overvoltage, a...
|
|
|
5963441 |
Alternating current rectifier bridge and system for measuring average current per bridge segment
A three-phase controlled rectifier bridge for converting alternating current to direct current includes six segments for each of the positive and negative polarities of each of three AC phases....
|
|
|
5852556 |
Power converter
A power converter comprises a pulse generator capable of outputting two different levels of gate power. A thyristor (LTT) is turned on by the first gate power output from the pulse generator, and...
|
|
|
5838555 |
Two-wire power supply electronic switch
A two-wire power supply switch connected in series with a load between two poles of an alternating current mains electrical power supply conventionally includes a main triac between two terminals...
|
|
|
5757169 |
Electric circuit for pulse energized electrostatic precipitator and pulse energized electrostatic precipitator using this circuit
An electrostatic precipitator circuit has an input terminal supplied DC voltage, an output terminal connected to a precipitating capacitor, a storage capacitor connected between ground potential...
|
|
|
5532562 |
Apparatus for controlling DC motor with H-bridge switching circuit
A control circuit for an H-bridge circuit comprises a single capacitor, a charge/discharge circuit for charging/discharging the capacitor in response to a control command signal, a voltage detector...
|
|
|
5521810 |
Rectifying saturable reactor
A rectifying saturable reactor generates a magnetic force in a magnetic iron core in response to a current that flows through an electronic circuit. The saturable reactor makes use of saturable...
|
|
|
5451846 |
Low current compensation control for thyristor armature power supply
A control system for energizing a direct current (DC) motor with alternating current (AC) power includes a first voltage sensor for a peak voltage of AC power; a second voltage sensor for a counter...
|
|
|
5347441 |
Thyristor converter system with higher harmonics suppression
A semi-conductor bridge thyrister converter circuit for converting AC power into DC power with suppression of the higher harmonics generated by the circuit including a semi-conductor converter...
|
|
|
5337228 |
Differential charging circuit
A differential charging circuit comprising an active switch device controlled by a differential trigger circuit and a current impedance device to charge a storage battery through an intermediate...
|
|
|
5321343 |
Digital motor control system
A control system for one or more dc motors in which thyristor power modules selectively gate portions of half cycles of ac voltage to the motor field and armature windings, has digitally...
|
|
|
5155673 |
Thyristor converter protection method and apparatus
A method and apparatus for protecting thyristors in a power converter from overvoltages. Voltage detectors determine if the forward voltage of each thyristor has increased in the converter. If such...
|
|
|
4811189 |
AC rectifier circuit with means for limiting the rectified voltage
The invention relates to an AC voltage supplied rectifier circuit with a downstream smoothing capacitor. A prior art problem with this type of circuit was that the inductive impedance of the supply...
|
|
|
4785388 |
Gate pulse generator for thyristor converter
In a gate pulse generator for a thyristor converter of the type in which in order to fire thyristors of the thyristor converter in which each arm is comprised of a plurality of series-connected...
|
|
|
4780804 |
Method and an arrangement for enabling the magnetizing current passing through a transformer to be minimized when an asymmetric load is applied to the secondary side of the transformer
The invention relates to a method and to an arrangement for controlling the respective conduction times of two directionally opposed electrical devices (9,10) which are mutually connected in...
|
|
|
4772998 |
Electrostatic precipitator voltage controller having improved electrical characteristics
A control system for controlling high power from an AC source for electrostatic precipitators. The AC power is gated both on and off during the same half-cycle of the AC sources. The gating off of...
|
|
|
4744017 |
High tension power supply with means for preventing transformer saturation
A high tension power supply for use in an x-ray tube drive circuit which uses a step-up transformer to raise an input line signal to the desired voltage level. A partially open bridge or other...
|
|
|
4731723 |
Power supply installation for DC electric railroad
The power supply installation for a direct current railroad comprises two diode bridge-connected circuits, only two thyristor breakers each connected in parallel to each of the two diode...
|
|
|
4731722 |
Low AC harmonic DC power supply
A DC power supply which generates little or no harmonics on the supply line includes a bridge circuit having high frequency controlled unilateral switching devices in the four legs thereof and a...
|
|
|
4730245 |
Power cut detection apparatus for power converter
A power converter having an ac side connected through a reactor to an ac power source and a dc side connected to a smoothing capacitor and a load, the converter being capable of converting and...
|
|
|
4719551 |
Optically controlled power converting apparatus
The present invention provides an optically controlled power converting apparatus using light trigger/light quench electrostatic induction thyristors, as switching elements, which can execute the...
|
|
|
4709322 |
High efficiency transformerless AC/DC converter
An electronic power supply that converts alternating current to a regulated DC voltage with high efficiency is accomplished by a switch that connects the input AC power source directly to the DC...
|
|
|
4665476 |
High-voltage pulse power source and pulse-charging type electric dust collecting apparatus equipped therewith
A novel high-voltage pulse power source comprising an ON-OFF type high-voltage switch element, as high-voltage switch element, which can be reset in OFF state immediately after an ON action, and a...
|
|
|
4618921 |
Power supply system and a starting method thereof
A power supply system for supplying a load current to a load including a serially connected circuit of a controlled rectifier, a switch and a capacitor. A diode is connected in parallel with the...
|
|
|
4607324 |
Reduced harmonic current rectifier including sequentially switched secondary windings
A rectifier circuit for receiving an A.C. electrical power signal at a pair of circuit input terminals and for providing a rectified, D.C. electrical power signal at a pair of circuit output...
|
|
|
4600982 |
Low power consuming AC to DC converter
A circuit for converting an AC potential to a regulated DC potential which circuit consumes a minimum of power and is relatively inexpensive to build is described. A capacitor is used to couple the...
|
|
|
4564819 |
Phase detecting apparatus
A phase detecting apparatus comprises a first PLL and a second PLL having a response time shorter than the response time of the first PLL. An AC voltage signal produced by the first PLL which is in...
|
|
|
4535400 |
Means and method for simultaneously triggering series SCR's
A method for simultaneously triggering a plurality of serially connected SCR's transfers energy from a relatively low voltage energy source to each of a plurality of energy storage devices which...
|
|
|
4517635 |
Line-commutated converter circuit
This line-commutated converter, in one form, has a pair of D.C. terminals for connection to a D.C. system and a pair of A.C. terminals for connection to an A.C. system. The converter comprises...
|
|
|
4480298 |
Multiple output DC-to-DC voltage converter apparatus
A voltage converter apparatus is provided to energize a first load and a second load from a power supply connected through an inverter and a coupling transformer, with the transformer having a...
|
|
|
4468724 |
Method and apparatus for controlling load current
A load DC motor is supplied with a DC current through a converter principally consisting of thyristors controlled by an ON-state control signal. The load current is detected both as to the mean...
|
|
|
4467408 |
Means for controlling a forced commutated ac-to-dc electric rectifying circuit to avoid commutation failure
A phase-controlled ac-to-dc rectifying circuit includes a pair of alternately conducting main controllable electric valves and cyclically operative forced commutation means for turning off the main...
|
|
|
4449054 |
Electronic circuit for controlling the supply voltage of electromagnets, electric motors, resistors, in single- and three-phase systems
The control circuit comprises a solid state controlled switch coupled to a terminal of the mains and a terminal of the load the supply voltage whereof has to be controlled, and a non controlled...
|
|
|
4432034 |
Bridge rectifier for selectively providing a full-wave or a half-wave rectified voltage
An automatic power reduction circuit having a single silicon controlled rectifier in one leg of a bridge rectifier which is gated off when a capacitor reaches a predetermined voltage level so as to...
|