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RE40907 |
Ripple cancellation circuit for ultra-low-noise power supplies
A low-ripple power supply includes a storage capacitor coupled across load terminals, and an inductor connected to a source of voltage including a varying or pulsatory component and a direct...
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7529106 |
Voltage monitoring device and inverter device
A voltage monitoring device 30 includes an AC input portion 31 , a rectifier circuit 32 , and a detection circuit 33 . The AC input portion 31 receives alternating current output from a...
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7511973 |
Constant current mode ripple attenuation method in flyback power supply
A modification of a control loop of a primary side sensing power control system that uses a different and unique relationship to accomplish the constant current control while attenuating the...
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7495939 |
Ripple filter circuit
A ripple filter circuit for ensuring the driving of a driving subject while efficiently eliminating ripple even when the operational voltage margin is small. A first transistor, which is connected...
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7483280 |
Capacitive power supply circuit and method
A capacitive power supply circuit, comprising a power storage element between two output terminals for providing a rectified output voltage; in series between a first input terminal for applying an...
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7382112 |
Methods and devices for input waveform control in switching power supplies
The invention recognizes that filter size can be reduced substantially as power factor is permitted to deviate below unity in systematic ways. Preferred methods of the invention provide specific,...
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7365998 |
Unregulated isolated DC/DC converter with ripple control
An unregulated isolated DC/DC converter is configured to receive an input signal and to provide an output signal. A ripple control circuit is coupled to the unregulated isolated DC/DC converter,...
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7355865 |
Method and apparatus for rejecting the second harmonic current in an active converter with an unbalanced AC line voltage source
A method and apparatus for altering converter control as a function of the degree of unbalance in supply line voltages to substantially eliminate second harmonics on the supply lines caused by...
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7289341 |
Power supply adaptive feedforward control circuit
A power supply system is disclosed. In one embodiment the power supply system includes a source of DC power that provides a DC bus voltage between a pair of DC bus terminals, and a power supply...
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7193397 |
Voltage converter
A voltage converter includes a transformer circuit, a filter, and a controller. The transformer circuit is coupled to the filter, and the controller is coupled to the transformer circuit and the...
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7142440 |
Ripple-current reduction for transformers
A ripple current reduction circuit is provided that reduces the ripple current of a transformer by providing a substantially opposite or inverse ripple of an auxiliary current that can be combined...
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7123491 |
AC-DC converting device, and electrical apparatus provided with AC-DC converting function
An AC adaptor has a switching regulator for converting alternate current to direct current. Filters are provided to filter conducted noise, and a filter switcher switches to the filter to be used...
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7075274 |
Reactive power compensator
A reactive power compensator continues operation even when a higher harmonic wave component of an alternating-current power system increases. For an alternating current electric amount indicating...
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7038438 |
Controller for a power converter and a method of controlling a switch thereof
A controller for, related method of controlling a switch of, a power converter and a power converter employing the same. The controller is employable with a power converter including a switch of a...
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6980445 |
Power factor improving converter and control method thereof
A boost quantity detecting section ( 103 ) detects a boost quantity of an inductor (L 11 ). An operational amplifier ( 113 ) of a control section ( 106 ) compares the boost quantity detected by the...
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6693805 |
Ripple cancellation circuit for ultra-low-noise power supplies
A low-ripple power supply includes a storage capacitor coupled across load terminals, and an inductor connected to a source of voltage including a varying or pulsatory component and a direct...
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6650554 |
Power factor corrector with efficient ripple attenuator
Power supply apparatus includes a power factor corrector (PFC) unit, which is adapted to receive an AC voltage from an AC source, and to smooth the AC voltage while adjusting a waveform of an AC...
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6556460 |
Method for controlling a vehicle provided with an electric power converter
The voltage applied to a power converter is detected by a voltage detector, a function generator produces a voltage proportional to this detected voltage, and a high-pass filter detects an AC...
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6489755 |
Active ripple and noise filter for telecommunication equipment powering
An active tracking filter reduces low frequency noise (such as a 20 Hz ringing signal) riding on a DC voltage (e.g., on the order of (−40 VDC) applied to a load such as a subscriber line...
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6465992 |
Preconditioner generating feedback signal having reduced ripple
A preconditioner comprises a rectifier, a switch mode power supply, and a feedback path for feedback of a preconditioner output voltage to a control block. The rectifier is arranged to receive an...
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6437997 |
Control device for electric power translating device
An electric power translating device employs a converter for converting an AC source voltage into a DC voltage, a smoothing capacitor connected at the DC side of the converter, an inverter for...
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6300740 |
Circuit for driving inductive loads
A circuit comprises at least one electronic switch which is operatively connected to an inductive load, is intended to be driven by means of an on-off signal and, in an enabled condition, can...
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6278623 |
System and method for compensating for voltage notches in two-phase phase locked loops
A method and system for compensating for voltage notches in phase locked loop (PLL) control devices. A bridge firing controller receives signals representative of two of the line to line voltages...
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6239992 |
Electric power unit with early auxiliary capacitor charging
The present invention relates to an electric power unit with a condenser input type rectification circuit which converts an alternating current power source to a direct current voltage, and more...
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6166931 |
Filter for a D. C. converter
A filter for a direct current voltage converter includes chokes L1, L2 and capacitors C1, C21. The filter is connected between the feeding source and the direct voltage converter, and an auxiliary...
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6157554 |
Power unit
The present invention relates to an electric power unit with a condenser input type rectification circuit which converts an alternating current power source to a direct current voltage, and more...
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6154090 |
Method of and an active filter for reducing a residual ripple of a current drawn by a load from a network
A method of reducing feedback action on a timely flow of current, which is drawn by a load from a network via rectifier, by active filtering of upper harmonics, which are superimposed on a network...
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6026126 |
Method and apparatus for reducing a ripple signal in an output of a direct current power supply
A method and apparatus reduces an output ripple signal of a power supply (200) for supplying a DC voltage and current to a load. One of the output ripple signal and an intermediate ripple signal is...
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6026006 |
Integrated three-phase power converter and method of operation thereof
An integrated three-phase power converter and method of operation thereof is provided. The integrated three-phase power converter includes: (1) first and second power switches coupled between...
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5963439 |
Device for limiting transient variations of a supply voltage
The present invention relates to a device for limiting transient variations of a voltage for supplying a load from a dc/dc converter, including an input terminal, that receives the voltage provided...
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5936855 |
Harmonic correction of 3-phase rectifiers and converters
An AC-DC converter for connecting an AC supply and a DC has a rectifier, and a harmonic correction circuit formed of (a) thyristor inverter legs connected at a common output point to form a Y...
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5874829 |
Supply voltage processing circuit and a data carrier with a supply voltage processing unit
Two parallel regulator stages, each comprising a transistor (T1, T2, respectively), are provided. The transistor (T2) forms part of the indirect parallel regulator stage and acts directly on the...
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5808882 |
Three-phase bridge rectifier
A three-phase bridge rectifier includes three bidirectional switching circuits each including a single-phase rectifier circuit having four single-phase bridge-connected diodes and a semiconductor...
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5729652 |
System for controlling the speed of a motor driven by an unregulated voltage
A method for controlling the speed of a motor driven by an unregulated voltage supply is disclosed. The disclosed method comprises obtaining a ripple signal (V R ) representative of the ripple...
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5712774 |
Device for suppressing higher harmonic current of power source
A device for suppressing higher harmonic current of a power source and applicable to a switching power source, air conditioner with an inverter, lamp regulator or the like. The device suppresses...
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5668708 |
DC power supply with reduced ripple
A switching power supply for providing a dc voltage with substantially no ripple includes a rectifier for rectifying an ac supply, a filter for filtering the rectifier output and an inductor for...
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5668464 |
Feedforward active filter for output ripple cancellation in switching power converters
An active filter provides ripple cancellation in a DC-DC converter. The feedforward filter applies to any converter with an output filter inductor. The filter is inherently stable, performs in both...
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5663876 |
Circuit and method for achieving zero ripple current in the output of a converter
A power converter and a method of operating a power converter. The power converter includes: (1) a transformer for receiving bipolar electrical input power from a power source, the power...
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5600549 |
Power factor corrected electrical power converter
An electrical power converter system having a power factor correction circuit and a switching power converter. The power factor correction circuit converts the AC line voltage into an unregulated...
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5555182 |
Source quality monitoring system
A digital signal processor implemented monitoring circuit for detecting phase and magnitude disruptions in multi-phase alternating current input signals. A phase lock loop receives multi-phase...
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5532528 |
Converter including direct current detection
A circuit arrangement which is provided with an up-converter (3) which comprises at least an inductive device (31), a switch (32), and a capacitive device (34) which in the operational state is...
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5528123 |
Power circuit
This invention measures the total line current in a power cord which is used to energize both a power factor corrected system and non-power factor corrected AC loads. The power factor control loop...
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5515261 |
Power factor correction circuitry
A power factor correction circuit for use with a power supply. The power supply has an input for receiving an AC input signal, a rectifier for producing a rectified AC signal and an output stage...
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5471378 |
AC to DC converter system with ripple feedback circuit
A nonlinear ripple feedback circuit for use with a current-sourced rectifier system with an inductor input filter. The nonlinear ripple feedback circuit eliminates the oscillation of the rectifiers...
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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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5406470 |
AC/DC converter
An AC/DC converter is provided for connecting to conductors of a multi-phased alternating current generator or network, which is built redundantly for protection against a total loss and which...
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5353212 |
Zero-voltage switching power converter with ripple current cancellation
A half bridge power converter utilizes two oppositely phased power switches operated with unequal duty cycles. A magnetic arrangement with two inductance values having a ratio equal to the ratio of...
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5349517 |
Active power line conditioner utilizing harmonic frequency injection for improved peak voltage regulation
The present invention provides an active power line conditioner (APLC) which has improved peak voltage regulation capability when compared with similarly-sized devices constructed according to...
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5343380 |
Method and apparatus for suppressing time-varying signals in batteries undergoing charging or discharging
An electronic device for effectively preventing time-varying current from passing through an electro-chemical cell or battery is disclosed. Time-varying current flowing in a circuit which includes...
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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...
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