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7615984 |
DC-DC converter and method of controlling thereof
A DC-DC converter can prevent intermittent failure of a PWM or driving signal (V M ) when a load becomes light and prevent generation of unusual noise from a transformer. The converter includes a...
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7613018 |
Apparatus and method for supplying DC power source
An apparatus and method for supplying a direct current power source which is capable of compensating a power factor of an input power source by detecting an input current amount according to load...
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7605570 |
Bridgeless PFC converter with low common-mode noise and high power density
A bridgeless power factor correction converter that can reduce common-mode noise and enhance power density is made up of a boost inductor coupled to an input end, a bidirectional switch connected...
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7596009 |
Double-ended isolated DC-DC converter
In a double-ended isolated DC-DC converter, by using a main transformer and first and second pulse transformers, a first power switch of a primary side circuit and a first synchronous rectifier of...
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7596003 |
Electric power converter
A control circuit for controlling a subsidiary (high-side) switching device in an insulating electric power converter having a half-bridge structure includes a first series circuit of a resistor...
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7589982 |
Synchronous rectifier forward converter with reverse current suppressor
Disclosed is a synchronous forward converter having a reverse current suppressor connected to the gate of a freewheel switch. The reverse current suppressor is configured to receive a control input...
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7586769 |
Power converters having balanced power rail currents
A power factor correction (PFC) circuit includes a coupled split boost choke having at least two windings, at least two boost diodes and at least two power rails. Each power rail includes one of...
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7586764 |
Synchronized rectifier filter control device for protecting a power supply from reverse current
A rectifier filter control device for a power supply that includes: A saturable inductor (swing choke), capacitors; and rectifiers connected to a rectifier filter circuit. The rectifier filter...
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7580272 |
Power source apparatus
A boost chopper circuit converts AC power to DC voltage and supplies the DC voltage to a load. The boost chopper circuit includes a switching element and a reactor. A controller ON/OFF controls the...
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7564705 |
Synchronous rectification circuit for power converters
A synchronous rectification circuit for power converters operable under fixed and/or variable frequencies where no current sense circuit or phase-lock circuit are needed is provided. It has a power...
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7561451 |
Power converter apparatus and methods using a phase reference derived from a DC bus voltage
In a power converter apparatus, such as an uninterruptible power supply, a phase reference signal is generated responsive to a DC voltage on a DC bus. A magnitude reference signal may be generated...
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7551463 |
AC/DC converter with low harmonic currents
This AC/DC converter is an isolated converter with switch-mode current regulation by means of a controlled switch ( 5 ). The controlled switch ( 5 ) is protected by a current limiting device ( 9, 7...
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7551462 |
Soft switching DC-DC converter including a buck converter and a boost converter sharing a common transformer
A soft switching DC-DC converter is provided which includes circuitry for both a buck converter and a boost converter. The buck converter circuitry and the boost converter circuitry share a common...
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7542315 |
Active rectifier
A voltage signal rectifier produces a rectified voltage signal from an input offset voltage signal. The voltage signal rectifier includes input offset, output, and reference nodes, two actively...
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7541791 |
Switch mode power converter having multiple inductor windings equipped with snubber circuits
The present switch mode power converter having multiple inductor windings equipped with snubber circuits uses a small value inductor that has at least one properly oriented secondary winding, and...
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7538525 |
Power factor correction circuit
The present invention relates to a power factor correction circuit for compensating distortion of an input current. According to the exemplary embodiment of the present invention, a turn-on...
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7535739 |
Semiconductor switch
A semiconductor switch interrupts output when a microcomputer or an external IC operates abnormally is connected to a control device such, and is turned on or off depending upon a control signal...
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7535734 |
High power-factor AC/DC converter with parallel power processing
The present invention is an AC/DC (alternating current to direct current) converter. The converter contains two semi-stages. One is the boost-flyback semi-stage that has excellent self-PFC property...
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7535124 |
Voltage stabilizer
The voltage stabilizer for stabilizing a voltage of a circuit includes a first resistor, a second resistor, a voltage controller, and a current supply unit. The voltage controller keeps a voltage...
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7532494 |
Power supply unit
Embodiments of the invention provide a power supply unit that operates in a standby mode and in a normal mode. The power supply unit comprises a first power supply providing output voltages during...
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7532491 |
Apparatus and method for supplying DC power source
An apparatus and method for supplying a direct current power source capable of compensating a power factor of an input power source by increasing and decreasing energy required by load changes, the...
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7529107 |
Power supply and electronic ballast with voltage clamping circuit
A circuit ( 20 ) for powering a load ( 50 ) includes a rectifier circuit ( 200 ), a voltage clamping circuit ( 300 ), and a DC-to-DC converter ( 400 ) such as a buck-boost converter. Voltage...
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7525472 |
Integration type and converter and device including same
An integration type A/D converter in which a dynamic range is enlarged while keeping a simple circuit configuration is provided. Offset potential of an integrator is to be variable. Specifically,...
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7518896 |
Phase control system for switching power supply pre-regulator allows increased power transformer leakage inductance
A switching pre-regulator for a bulk capacitor filter followed by a series pass regulator has a switching element controller that relies upon a large desirable leakage inductance in a main...
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7518895 |
High-efficiency power converter system
In one embodiment, a power converter system includes a first input terminal and a second input terminal operable to connect to an alternating current (AC) power source, and an output terminal at...
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7518888 |
Control circuit and method for a fly-back voltage converter
In a fly-back voltage converter that includes a transformer to transform a primary current to a secondary current and a switch serially coupled to the primary winding to switch the primary current...
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7508687 |
Power supply that reads power requirement information across a DC power cord from a load
A power supply device that is capable of outputting multiple different output voltages is coupled by a DC power supply cord to an electrical device. An unpowered memory in the electrical device...
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7505291 |
AC/DC converter capable of actively restraining an inrush current
An AC/DC converter includes a rectifier circuit, at least one restraining unit, and a power interruption detection circuit. The rectifier circuit is used for converting an AC (alternating current)...
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7501800 |
Power factor correction circuit and output voltage control method thereof
Disclosed is a power factor correction circuit for varying an output voltage according to an input voltage, and an output voltage control method thereof. A reference voltage is generated...
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7499299 |
Method and apparatus for reducing body diode conduction of synchronous rectifiers
A circuit for controlling the operation of synchronous rectifiers. The circuit delays the turn-off of the synchronous rectifiers in accordance with the load current. The magnitude of the load...
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7495940 |
Method and device for producing rectifier gating signals using a peak detector
A device that includes an active rectifier ( 14 ) having control gates controllable to produce an output voltage on a DC bus ( 20 ), a gate control circuit ( 16 ) for producing gate control signals...
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7495410 |
Systems and methods for improved motor drive power factor control
Systems and methods are described for controlling power factor in motor drives having a switching rectifier providing a DC link current to an inverter in which the rectifier gain is increased to...
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7489532 |
Apparatus and method for a power converter with feed-forward voltage compensation to enable a PFC circuit
Apparatus and method for a power converter with feed-forward voltage compensation to enable a PFC circuit are proposed. A voltage divider and a feedback unit output a compensation voltage and a...
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7482794 |
System, method and apparatus for controlling converters using input-output linearization
The present invention provides a system, method and apparatus for controlling any type of converter using input-output linearization and leading-edge modulation. The controller includes a summing...
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7457137 |
Output sensor circuit for power supply regulation with main and switched outputs
A sense circuit is provided connected to a control loop of a circuit having an output. The sense circuit receives a signal derived from the output of the circuit and provides a controlling signal...
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7450407 |
Control method of AC/DC power converter for input current harmonic suppression
A harmonic-suppressing AC/DC power converter employs a control method for permitting the AC/DC power converter only to detect an input AC current and an output DC voltage. The control method can...
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7447051 |
Synchronous multi-phase AC-to-DC converter
Disclosed herein are various embodiments of power conversion systems and methods employing synchronous multi-phase AC-to-DC conversion. In one embodiment, a power converter comprises a transistor...
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7440299 |
Control of a MOS transistor as rectifying element
A circuit for controlling a switch to be controlled in unidirectional fashion while the voltage present thereacross is an A.C. Voltage, including circuitry for delaying the switch turning-on with...
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7432690 |
Dual circuit wall switch occupancy sensor and method of operating same
A method and apparatus are provided for detecting occupancy in an area using multiple detection technologies (e.g., ultrasound and infrared sensing) to intelligently control switching of plural...
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7428159 |
Digital PWM controller
A digital controller for controlling the operation of a DC-DC switching converter is disclosed. A digital feedback control system is provided for receiving an analog input voltage representing the...
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7423893 |
Power supply having two switch-mode power supply units
A power supply has first and a second switch-mode power supply (SMPS) units, which both contain a transformer having a primary winding and at least one secondary winding, and a driver stage. The...
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7420351 |
Power-factor correction device for variable speed drive
A variable speed drive for a three-phase electric motor, including a rectifier module supplying a rectified voltage from a single-phase alternating current network, a voltage step-up module...
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7417879 |
PFM and current controlled switching regulator
A circuit and method for controlling a switching regulator utilize a combination of variable off-time control (or frequency control) and variable peak current control to achieve high efficiency at...
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7397678 |
Method for driving a switch that controls current drawn in a power factor correction circuit and a drive circuit therefor
The invention relates to a method for provision of a drive signal for a switch which controls the current drawn by an inductive energy storage element in a power factor correction circuit, in which...
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7391631 |
Switching power source device
A switching power source device is provided which comprises a drive controller 40 connected between an error amplifier 26 and changeover circuit 37 . A second comparator 52 of drive...
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7391630 |
Method and system for power factor correction using constant pulse proportional current
A Power Factor Correction (PFC) system providing near unity power factor for an AC power source (VAC) connected to a complex load. The system includes a bridge rectifier, boost or buck-boost...
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7388761 |
High efficiency parallel post regulator for wide range input DC/DC converter
Apparatus, methods, system and devices for providing a high efficiency parallel post regulator for a wide range input DC/DC converter. The wide input range DC/DC converter achieves...
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7388361 |
Mainboard and power control device thereof
A power control device includes a comparison unit, a control unit and a switch unit. The comparison unit electrically connects to a first power rail and a second power rail, respectively, and...
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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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7379311 |
Inrush current control circuit
An inrush current control circuit includes a first and second control units connected in series, wherein the first and second control units all have a current limiting resistor and switch connected...
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