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5189602 |
High-voltage generator with selective half-bridge and full-bridge operation
An assembly is made enabling an inverter of a high-voltage generator to pass from a full-bridge use to a half-bridge use, in replacing a connection circuit of a mid-point of a first rectifier of...
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5182701 |
Three-phase PWM inverter providing an improved output sinusoidal waveform
In an inverter in which six switching elements of an inverter main circuit is controlled to be turned on and off under a switching pattern in which a voltage space vector composed of adjacent two...
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5182463 |
3-Phase converter apparatus
A 3-phase converter apparatus, in which a 3-phase A.C. power supply and a 3-phase converter operate in parallel on a common load BUS so as to share the load power, has an output voltage command...
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5177678 |
Inverter apparatus for preventing an overincrease of output frequency
An inverter apparatus using a microcomputer control system suitable for use in driving an ac rotary electric machine is concerned. The inverter apparatus includes a device for detecting an output...
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5168439 |
Inverter control method and apparatus
A method and apparatus for controlling an inverter circuit to convert dc voltage to variable amplitude and frequency ac voltage use firing pattern tables which are stored and selected in accordance...
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5168435 |
Converter
According to this invention, a converter includes a voltage transformer, a switching transistor, a resistor, a control transistor, and a control circuit. The voltage transformer has a primary...
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5159542 |
Selectable hysteresis controller for pulse width modulated inverter
A current mode hysteresis controller for an inverter circuit provides selectable hysteresis bands based on the level of current to be provided. In the preferred embodiment of the controller,...
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5157594 |
Temperature-based inverter control system
A control system for controlling an inverter having a connector for connecting the output of the inverter to a load wherein a temperature sensing arrangement senses the temperature of the connector...
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5148361 |
Method and device for balancing the circuits of a three-phase system
A method and a device balance a three-phase system (18) that is produced by means of an invertor (12) from a d.c. voltage source (10), such that the output (R',S',T') of this invertor (12) is...
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5148362 |
Method and device for balancing a three-phase system
A method and a device balance a three-phase system (18) formed by means of an invertor (12) from a dc voltage source (10), the output (R', S', T') of said invertor (12) being provided with a filter...
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5138247 |
Reactive power compensating apparatus with higher harmonic suppressing function
Higher harmonic power components and fundamental wave reactive power components are derived from a load voltage and current, using theory (instantaneous p-q theory) regarding instantaneous real...
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5128853 |
Damping resonant oscillations in a parallel resonant inverter
A control process and trigger equipment damps resonant oscillations of a parallel-resonant circuit for a pulse-controlled inverter of a current-source inverter. The pulse-controlled inverter...
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5111376 |
Voltage balancing circuit
Prior voltage balancers for three-phase inverters are useful only with inverters which are not in wide use today. In order to overcome this problem, a voltage balancing circuit for a commonly used...
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5111014 |
Electromagnetic cooker including load control
In an electromagnetic cooking apparatus, low heating power control is carried out by turning ON/OFF a DC power supply circuit, or rectifier circuit, at a commercial frequency lower than an...
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5111377 |
Interconnection for electric power system
In a power interconnection system between an electric power system and a power converter which makes AC power from a DC power source, a positive feed-back loop is constituted so as to include a...
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5088016 |
Voltage-compliant DC-DC converter module
A voltage-compliant power converter module which converts power from an input source for delivery to a load, the load being external to the voltage-compliant converter module and including an...
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5079686 |
Enhancement-mode zero-current switching converter
An enhancement-mode converter module, which converts power from an input source for delivery to a load in a series of quantized energy transfer cycles, includes a zero-current switching converter,...
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5068775 |
High dynamic performance DC-DC converter system with time share control
A high dynamic performance, DC-DC converter system with time sharing cont is described, comprising at least one main control circuit loop for a direct output voltage and at least one further...
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5065304 |
Controller for AC power converter
A controller for AC power converter having an LC filter connected to a load, can suppress fluctuation of the output bus voltage against disturbance, particularly against fluctuation of load current...
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5057989 |
PWM controlled DC/AC power converter
In an apparatus for controlling a power converter, which is adapted to control, in accordance with a PWM system, a voltage-type inverter for system interconnection interposed between a d.c. power...
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5053939 |
Control of PWM inverters by pattern development from stored constants relating D.C. link harmonics to output distortion
A pulse-width-modulated inverter in which equations relating switching angles, d.c. link distortion and a.c. inverter output distortion are determined empirically or by computer modeling. The...
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5047913 |
Method for controlling a power converter using an auxiliary resonant commutation circuit
A method for controlling a power converter and an associated auxiliary commutation circuit ensures soft-switching of all switching devices employed therein. Such a power converter includes an...
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5032974 |
Three-phase alternating current circuit configuration, for using a power supply for the synchronized timing for an electrical apparatus
A three-phase circuit configuration for the synchronized timing of an electrical apparatus with the three phase power supply where the timing clock pulses are formed from a control voltage. In a...
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5029064 |
Phase-controlled reversible power conversion with equal duty cycle substantially constant amplitude square wave excitation of the power transformer
A universal phase-controlled reversible power converter having one transformer with multiple windings couples a d.c. voltage to an associated transformer winding through a fixed port having...
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5029061 |
Emergency lighting system
A circuit 10 for supply a fluorescent tube 12 comprises a power supply 14 which modulates the mains supply at 24 to produce a DC supply at 16. A relay J and a switch S2 apply the DC supply to a...
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5018058 |
High frequency AC voltage control
This voltage control apparatus produces distortionless, stabilized alternating output voltage subject to distortion. The apparatus comprises a wave form reshaping circuit connected to the voltage...
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5012400 |
DC/AC power converting apparatus including DC component remover
In a DC/AC power converting apparatus, a DC component is removed from an AC output. The DC/AC power converting apparatus includes: a DC source for supplying DC power; a DC/AC inverter circuit for...
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5010291 |
Single quadrant chopper timing control circuit for discontinuous current
A single quadrant chopper timing control circuit is used with unidirectional power flow chopper arrangements in a power inverter to maintain current oscillation between positive and negative...
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5006973 |
Autotuned resonant power source
A resonant, quasi-square wave, pulse width modulated (PWM) power source (33) for a connectorless power system is disclosed. The power source (33) supplies constant amplitude, fixed-frequency...
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5005114 |
Circuitry for generating phase-shifted sinusoidal voltages
An arrangement for generating phase-shifted sinusoidal voltages, in which a plurality of resistors are connected in series in a closed circular network to provide the sinusoidal voltages....
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5001622 |
Enhanced real-time control of PWM inverter
In a pulse width modulated inverter, the fit of a selected switching angle is monitored by counting zero crossings in a neighborhood of the function ##EQU1## for each harmonic of interest. If the...
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4994955 |
Half-bridge driver which is insensitive to common mode currents
A half-bridge is made insensitive to transient induced common mode currents in a pair of control lines between a level shifter and a floating driver for a power transistor of the half-bridge by the...
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4991075 |
Low-switching loss DC-DC converter
A DC-DC converter comprises a switching element having a rise time t on and a fall time t off ; a control device for controlling the switching operation of the switching element; a transformer...
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4985821 |
Indirect current sensing of DC to DC converters
Disclosed are circuits for indirectly sensing and controlling the output current of switching type DC to DC converters utilizing capacitance which follows the output voltage by being responsive to...
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4984148 |
Two-phase bang-bang current control synchronizer
A two-phase bang-bang current control synchronizer for synchronizing two current streams which pass within a hysteresis controller. Synchronization occurs by summing a fixed hysteresis threshold...
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4963795 |
Step-controllable electronic ballast
An inverter-type fluorescent lamp ballast is powered from the power line by way of a common and either of two (or more) different power leads. When powering the ballast by way of the common and the...
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4964027 |
High efficiency power generating system
A power generating system (10) in accordance with the present invention includes a converter (14) for producing an AC output (16) including a fundamental and at least one harmonic of the...
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4941079 |
Pulse width modulation power transmission system
A converter for interconnecting two electric networks to transmit electric power from one network to the other, each network being coupled to a respective power generator station. The converter,...
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4939427 |
Ground-fault-protected series-resonant ballast
A self-oscillating half-bridge inverter is powered from a power-line-operated DC voltage source and has a series-tuned high-Q LC circuit connected across its output. A pair of fluorescent lamps is...
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4937721 |
Cancellation of regulator output filter poles by second derivative feedback
Instability resulting from the presence of reactive components in the output filter of regulated power supplies of the general type in which regulation is obtained by feeding back the output...
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4937462 |
No break power transfer control for a VSCF power generating system
In aircraft applications, it may be necessary or desirable to transfer one or more loads between a variable speed, constant frequency (VSCF) power generating system and a further source of AC...
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4933829 |
Free running flyback DC power supply with current limit circuit
The present invention relates to a DC power supply of the free-running flyback type and a current limit circuit incorporated therein. The current limit is changed as a function of AC line voltage...
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4928220 |
Switching mode DC-to-DC power supply with improved current sensing
A switching rectifier power supply circuit has a power MOS transistor connected in series with half of the primary of a center-tapped transformer, and has rectifiers in series with an inductive...
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4924373 |
Apparatus and method for controlling switching elements in a PWN-controlled voltage source inverter
Disclosed is an apparatus and method for controlling switching elements (51-56) of a PWM-controlled value type inverter by a software program using a microcomputer (10). The control apparatus of...
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4916382 |
System for maximizing efficiency of power transfer
A system for maximizing the efficiency of power transfer from a photovoltaic source to a load element, such as a fluid pump to circulate fluid in a swimming pool system. The system is operative to...
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4905136 |
Power supplying apparatus
The output of an AC power source is converted into DC power through a rectifying stack and an electrolytic capacitor and this DC power is input to a chopper circuit, which includes a first...
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4903187 |
Control for variable frequency drive
A star-connected sensing resistor at the A.C. output side of a PWM inverter detects an output voltage across the resistor, a PWM control according to the invention then amplifies the detected...
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4903183 |
Power supply for a magnetron
In a magnetron power supply for obtaining a high voltage for an anode by an inverter circuit, there is disclosed the improvement including a detector for detecting an AC output current of a...
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4891742 |
Procedure and device for eliminating interference generated by power switches
Device for eliminating interference in a given electrical signal generated by one or several power switches. The device includes an electronic switch interposed on the line of propagation of the...
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4823251 |
Controller for instantaneous output current and/or voltage of 3-phase converter
A control circuit for a 3-phase converter which is provided to control the 3-phase converter having an output filter provided with a current minor loop which controls an instantaneous value of the...
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