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8184455 |
Power adapter having power factor correction circuit, switch voltage regulation circuit and voltage stabilization circuit controlled by feedback signal
A power adapter to receive at least one AC input power and transform to DC primary output power includes a power factor correction circuit to receive the AC input power and modulate to become a...
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8184421 |
Power converter
The objective of the present invention is to provide a power converter capable of not only boosting the voltage but also shutting-off the flowing current, by switching only the switch element. The...
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8174849 |
Electric power converter with soft switching for two way power conversion
An electric power converter facilitates performing soft switching in the two-way electric-power-conversion operation thereof, and reducing the manufacturing costs thereof and the losses caused...
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8159845 |
Current-sharing power supply apparatus
A current-sharing power supply apparatus is applied to regulate voltage level of an input DC voltage, and the regulated DC voltage is stabilized in a predetermined voltage to be used on rear-end...
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8148934 |
Voltage step-up/down converter
A motor control apparatus includes a step-up/down converter and an inverter. The converter includes a coil, MOSFETs, capacitors and a control circuit. The control circuit turns on the MOSFET in the...
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8143954 |
Oscillation device with auxiliary oscillating means
A device can be coupled to an electrical load for supplying electrical power to the electrical load. The device contains an oscillator unit and an auxiliary oscillator unit. The oscillator unit is...
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8143797 |
DC/AC inverter
A direct current to alternating current (DC/AC) inverter is for driving a fluorescent lamp through quasi sine wave generation. The DC/AC inverter includes a frequency generator for generating a...
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8138700 |
Synchronous rectification device and synchronous electric machine implementing the device
The invention pertains to a synchronous rectification device (10) of the H-bridge type supplying a coil (5) of a phase of a synchronous machine, comprising four switches (21, 31, 22, 32) disposed...
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8125304 |
Power electronic module with an improved choke and methods of making same
An improved choke assembly for a power electronics device is provided. More specifically, a choke assembly with improved protection from environmental conditions such as dirt and water is provided....
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8125208 |
Transformer device utilizing an air gap for non-contact energy transmission from the primary side to the secondary side
A device and method for non-contact transmission of electrical energy by means of a transformer (1) comprising at least a primary side (2) and at least a secondary side (8), and where resonance is...
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8116683 |
Adaptive inductive power supply with communication
An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating...
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8107262 |
Variable switching frequency type power supply
There is provided a variable switching frequency type power supply that can achieve high efficiency by fixing a switching duty cycle to 50% and varying switching frequency. A variable switching...
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8094466 |
Resonant converter
The invention relates to a resonant converter (1) which has multiple outputs (7a, 7b) and contains a transformer (4) with a primary winding (5) and at least two secondary windings (6a, 6b) having...
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8089785 |
Power conditioning unit
A photovoltaic power conditioning unit for delivering power from a dc photovoltaic power source to an ac mains power supply is disclosed. The photovoltaic power conditioning unit may include a...
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8081492 |
Switching power supply with smoothing circuitry for more stable output
The first choke coil and the third choke coil are not magnetically coupled to the second choke coil and the fourth choke coil. Therefore, even in a case where a structure for increasing the heat...
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8077482 |
DC-DC converter
Provided is a DC-DC converter that can reduce losses. Ein and C1 are serially connected. Q1 and Q2 are serially connected so that antiparallel diodes thereof face the same direction. A terminal of...
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8068355 |
Apparatus for isolated switching power supply with coupled output inductors
A multiphase DC-to-DC power converter has two or more sets of input switches, each set of input switches driving primary windings of at least one associated transformer. Each transformer has one or...
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8064226 |
Control circuit with frequency compensation
The present invention discloses a control circuit with frequency compensation, which can be applied to an open-loop control system. The control circuit includes an oscillator which is additionally...
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8054650 |
Switching power supply circuit and driving method thereof
A switching power supply circuit includes a direct current (DC) power supply input, a first transistor, a capacitor, a first resistor, a second resistor, a switching circuit including a second...
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8050059 |
Charging probe circuit
Various example embodiments are disclosed. According to one example embodiment, a charging probe may include an alternating current (AC) input configured to receive current from an AC source, a...
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8040706 |
Sine wave lamp controller with active switch commutation and anti-flicker correction
A pulse width modulated half bridge dimming controller for dimming a lighting ballast is described. The top half of the bridge is comprised of two switches, the top switch set, and the bottom half...
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8035367 |
Electronic device, detection circuit and voltage control method
A voltage control method includes producing an error signal based on a difference between a reference signal and an adaptor voltage and an adaptor current corresponding to the adaptor voltage,...
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8027175 |
Power supply adjusting apparatus
A power supply adjusting apparatus includes a primary isolation converting unit, adapted to convert voltage or current of an input power supply signal and output a power supply signal that meets an...
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8027174 |
Adapter power supply
An advantage of the present invention is to provide an adapter power supply which varies a link voltage of DC power serving an input power of a DC/DC converter according to variation of a load...
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8018740 |
LLC soft start by operation mode switching
An embodiment of the invention provides a method of reducing surge current in an LLC converter. The LLC converter comprises a switching circuit having a first switch and a second switch, a resonant...
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8018186 |
Method and apparatus of fan motor brake
An electronic system for controlling a fan motor includes a microcontroller and a drive circuit. The microcontroller draws power from a first voltage source and generates control signals for...
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8014174 |
Image forming apparatus
The present invention can include an image forming apparatus having an electrical load, a supplying circuit configured to supply an electrical power to the electrical load, and an output circuit...
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8014172 |
Control arrangement for a resonant mode power converter
A resonant mode power converter is controlled with a control unit including a feedback circuit coupled to generate a first current representative of an output of the power converter. A current...
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8004253 |
Duty cycle dependent non-linear slope compensation for improved dynamic response
A two-stage converter including a buck converter and a DC-DC converter that receives power from the buck converter. The DC-DC converter generates an output voltage of the two-stage converter. A...
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7986534 |
Apparatus to generate high voltage by digital control and method thereof
An apparatus to generate a high voltage includes a switching part to control a voltage induced in a secondary coil of a power transforming part, by interrupting a current in a primary coil of the...
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7979223 |
Systems and methods for power hardware in the loop testing
A system for power hardware in the loop testing is described. The system includes a power system and a control system, the power system connected to a power converter of a device under test, the...
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7977819 |
Power converter and controller using such power converter for electric rolling stock
Provided is a power converter having an inverter (13) wherein capacitors (12) are connected in parallel on a direct current side, and a power supply circuit configured to supply the inverter with a...
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7965523 |
Switching power supply device
In a switching power supply device, a first switch element, which defines a main switch element of a DC-DC converter, and a third switch element, which defines a switch element of a power-factor...
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7957160 |
Current waveform construction to generate AC power with low harmonic distortion from localized energy sources
Methods and apparatus to provide low harmonic distortion AC power for distribution by converting energy from natural or renewable sources into electrical form, and constructing a current waveform...
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7952296 |
Feedback circuit for DC/AC inverter
A feedback circuit is utilized in a DC/AC inverter having a first power switch and a second power switch for driving a fluorescent lamp. The feedback circuit includes a protection circuit for...
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7952301 |
Auto-dimming apparatus for controlling power delivered to a load
A circuit with a magnetically variable inductor that is placed in close proximity to an independently wound control coil and connected in parallel to a current transformer having primary and...
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7953369 |
System and method for inductive power supply control using remote device power requirements
An adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast. To improve the operation of the ballast, the ballast changes its operating...
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7952892 |
DC converters with constant and variable duty ratio switching
A DC converter comprises a half bridge supply circuit and one or more flyback or forward converter output circuits, and optionally also an LLC converter whose control can determine a common...
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7948194 |
Waveform current monitor using RDSon of low-side bridge FET
An apparatus for monitoring current for a motor drive including at least high-side and low-side switching transistors includes a driver circuit for driving a gate of the low-side switching...
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7944713 |
Electric power conversion circuit having transfer gain variable by pulse-width modulation
The present invention discloses a single stage DC to DC electric power conversation circuit which has a transfer gain variable by pulse-width modulation over a continuum from zero to beyond unity....
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7940533 |
Step-down voltage converter
A step-down voltage converter (100) for generating an output voltage (VOUT) from an input voltage (VIN) is provided. The converter (100) includes a switch (111) having a first terminal (112) and a...
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7936573 |
Bi-directional DC-DC converter and control method
A bi-directional DC-DC converter uses a transformer for both step-down and step-up operations. A switching frequency for operating a switching device is set separately for the step-down and step-up...
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7932800 |
Method and apparatus for three-dimensional integration of embedded power module
A modified planar Low Temperature Co-Fired Ceramic (LTCC) high conductance inductor, embedding a large cross section conductor, supports a stacked arrangement of heat spreader, inductor and active...
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7916503 |
DC-DC converter, power supply voltage supplying method, and power supply voltage supplying system
According to one aspect of the invention, a DC-DC converter including a soft-start function of a soft start in response to a soft-start signal, comprises: a detection circuit that detects whether...
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7911808 |
Primary side constant output current controller with highly improved accuracy
A comparing circuit and a control loop are used to maintain the peak level of current flowing through an inductor of a flyback converter. An inductor switch control signal controls an inductor...
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7912430 |
Circuit arrangement for wirelessly exchanging data and RFID chip card device
A circuit arrangement for wirelessly exchanging data with a reader device, including an antenna for converting electromagnetic radiation into an antenna voltage, an analogue circuit for...
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7911809 |
Switching power supply circuit
A switching power supply circuit includes a direct current (DC) power supply input terminal, a first transformer including a first primary winding, a second transformer, and a pulse generating...
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7903433 |
Current balancing for multi-phase converters
A converter for a multi-phase current network can include a plurality of current sensors, each of the plurality of current sensors being configured to detect current for a respective phase of the...
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7894224 |
Voltage drive system with hysteretic current control and method of operating the same
A voltage drive system is provided having a plurality of modulators and a plurality of cascaded switching circuits which collectively generate a single-phase output signal to a load. Each modulator...
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7894212 |
Switching power supply device
A switching power supply device includes a first series circuit of first and second switching elements connected in parallel with a DC power supply. An isolation transformer has primary and...
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