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7633779 |
Method and apparatus for operating a light emitting diode with a dimmer
A circuit includes an input and an output, and an electronic light generator drive portion that is coupled to the input and drives the output. In one configuration, the circuit includes a further...
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7630689 |
Electronic device
An electronic device that can receive an AM radio broadcast signal and has a switching power supply circuit, wherein a switching frequency of the switching power supply circuit is detected and a...
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7605546 |
Discharge lamp lighting apparatus and semiconductor integrated circuit
A discharge lamp lighting apparatus includes a triangular signal oscillator, a first control part to compare the triangular signal with an error voltage between a reference voltage and a voltage...
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7573729 |
Resonant power LED control circuit with brightness and color control
The invention relates to a resonant power LED control circuit for the independent, simultaneous brightness and color or color temperature control of two LEDs ( 41, 42 ) or two groups of LEDs,...
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7573730 |
Charging device with boundary mode control
A charging device with boundary mode control is disclosed. The charging device includes a transformer, a power switch, a detection circuit and a pulse-width modulation (PWM) controller. The power...
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7554820 |
Series resonant DC-DC converter
A series resonant Dc-DC converter powers an audio amplifier as a load. The series resonant DC-DC converter may include a power input stage, a switching stage, a series resonant stage, a transformer...
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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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7522430 |
Switching power supply apparatus
A switching power supply that can accurately detect a period during energy is supplied from a primary side to a secondary side of a transformer with a simple circuit configuration is provided. A...
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7522878 |
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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7518887 |
Apparatus and method for generating high voltage based on digital control
A digital high voltage generating apparatus and a method thereof are provided where a switching block controls voltage generated in a second side coil of a power transformer, a digital interface...
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7486066 |
Transformer, multi-output switching power supply, liquid crystal television
The present invention aims to obtain a stable output voltage without requiring an extra circuit by suppressing influence of noise of the primary winding and voltage induction by leakage inductance....
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7446512 |
Resonant switching power supply device
For the purpose of providing a resonant switching power supply device having a wide output voltage variable range by changing its switching frequency, the resonance circuit thereof comprises a...
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7433209 |
Soft-switching DC/DC converter having relatively better effectiveness
The proposed soft-switching DC/DC converter includes a converter circuit including a main switch having a first, a second and a control terminals for converting an input DC voltage to an output DC...
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7382636 |
System and method for powering a load
A power supply for inductively powering a remote device has an inverter operating at an operating frequency and a primary coil. A phase comparator compares the phase of the voltage or current...
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7375987 |
Resonant switching power source apparatus
A resonant switching power source apparatus has a first switching element and second switching element being connected in series between output terminals of a DC power source and are alternately...
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7339800 |
Switching power source device of resonance type capable of controlling switching loss and noise
A switching power source device of resonance type is provided which comprises an output voltage detector 18 for detecting output voltage on a load 13 to produce a detection signal; and a...
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7336057 |
DC/DC converter
A DC/DC converter includes: a boost converter that boosts an input voltage in accordance with a first control signal; an insulated converter that converts an output of the boost converter in...
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7330359 |
Power supply unit
The present invention is directed to a power supply unit that provides large power supply to the load. The voltage detector 51 generates a voltage detection signal by detecting the voltage...
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7321498 |
DC-DC converter having synchronous rectification without cross conduction
An apparatus ( 54 ) is provided for preventing cross conduction in a synchronous rectifier of a DC-DC converter ( 10 ). The DC-DC converter has an input MOSFET switch ( 26 ) coupled to primary...
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7319600 |
Apparatus for supplying power and liquid crystal display having the same
Disclosed are a power supplying apparatus and a LCD having the same that reduces manufacturing cost of a large-scale LCD module and enhances powpower efficiency by integrating an external dc power...
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7313004 |
Switching controller for resonant power converter
An integrated control circuit for a resonant power converter includes a minimum-frequency programming circuit connected a first resistor to program a minimum switching frequency of the power...
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7310245 |
Electric power transmission device and electric power transmission method
In an electric power transmission device in which a primary side power transmission coil (L 1 ) and a secondary side power receiving coil (L 2 ) are magnetically coupled, and electric power is...
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7291993 |
Method for driving a fluorescent lamp and an inverter circuit for performing such a method
A method for driving a fluorescent lamp and an inverter circuit for performing the same are used to reduce an amount of electromagnetic interference (EMI) generated by a transformer and an...
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7286373 |
Full-resonant power circuit device for receiving a variable input voltage
The present invention provides a full-resonant power circuit device for receiving a variable input voltage that a power factor correcting circuit for separating a variable input voltage AC into a...
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7239531 |
Resonant lossless circuit for providing a low operating voltage in power converter
A converter-controller includes a power device, coupled to the primary coil of a transformer, a resonant circuit, coupled to the primary coil and the power device, a voltage regulator, coupled to...
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7218536 |
Voltage regulator converter without switching losses
The invention concerns a converter which includes two input terminals and two output terminals, a main transformer presenting primary and secondary windings connected between the input terminals...
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7218533 |
Resonance converter with voltage regulation and method of driving variable loads
In a resonance converter for driving variable loads at first an input signal provided by a switch controlled by control means is converted to an output signal by a transformer. The transformer is...
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7212415 |
Resonance type switching power source
A control circuit 6 of a resonance type switching power source comprises a drive circuit 21 for supplying drive pulses to each gate terminal of first and second MOS-FETs 2,3 ; a PWM circuit 9...
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7196912 |
Lighting apparatus for discharge lamp
In a lighting apparatus for a discharge lamp, a mask signal against a re-arc voltage is correctly generated to detect a lamp voltage accurately in view of a support to high frequency lighting such...
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7184280 |
LLC series resonant converter and the driving method for the synchronous rectification power switches thereof
An LLC series resonant converter and a driving method for the synchronous rectification power switches thereof are provided. The LLC series resonant converter includes a bridge circuit, a resonant...
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7184279 |
Solid state switching circuit
A solid state switching circuit utilizes a transformer in series with the circuit's switching device by which energy initially stored in the primary of the transformer is recovered in resonant...
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7173831 |
Power converter having a primary side switching circuit
In one embodiment, an apparatus includes a transformer having a primary winding and a secondary winding and a switching circuit to facilitate a periodic application of an input voltage to the...
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7167384 |
Switching power circuit
A switching power circuit in which a synchronous rectification circuit of the winding voltage detection system by use of a resistance device is provided on the secondary side of a compound...
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7116561 |
Resonant power source apparatus
A resonant power source apparatus has a series circuit of switching elements QL and QH connected to ends of a DC power source, a series circuit of a current-resonant capacitor, a resonant reactor,...
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7110267 |
Circuit and method of igniting a high-pressure lamp
The invention relates to an electronic circuit for igniting a high-pressure lamp. A resonant circuit 13 of the circuit is used to supply the ignition voltage for the high-pressure lamp. To enable...
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7110269 |
Soft-switching techniques for power inverter legs
This invention relates to new soft-switching techniques for minimizing switching losses and stress in power electronic circuits using inverter legs. By choosing the switching frequency with...
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7072189 |
Power supply
A power supply is provided, by which power consumption of an electrical apparatus having a normal mode and a standby mode is reduced by including a dedicated power converter for the standby mode,...
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7042739 |
Switching electric source device
A switching electric source device includes a first synchronous rectifier control circuit, which detects the resonance state developed based on the exciting energy of the primary winding after the...
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7023183 |
Power supply with capacitive mains isolation
A power supply with capacitive mains isolation, comprises a source of an input supply voltage developed between a first terminal and a second terminal. A first supply inductance is coupled to the...
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7012381 |
DC—DC converter and device for operation of a high pressure discharge lamp using the converter
A low cost DC-DC converter facilitates a reduction of the switching loss in the wide, variable range of the continuity ratio for a main switching device. The DC-DC converter includes a direct...
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7002304 |
Multi-lamp drive device
A multi-lamp drive device comprises a transformer, a drive circuit and at least a balanced inductor. The magnetic core of the transformer has a first side column, a second side column and at least...
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6924991 |
Energy transfer multiplexer
An energy transfer multiplexer to control the flow of power or energy between an energy source and an energy load comprising a bi-directional inverter including a first bank or plurality of...
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6917531 |
Power supply system
Two proposals are made for power supply systems comprising at least one resonant inverter and one control unit. According to the first proposal the power supply system comprises two inverters and...
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6898091 |
Circuit configuration comprising a control loop
A circuit arrangement is disclosed with a regulating circuit which is particularly used for regulating a resonant converter having a plurality of outputs. The arrangement includes a protective...
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6831846 |
Switching power source circuit with drive frequency variably controlled by switching element
A complex resonance type switching converter provided with a self-excited voltage resonance type converter has a conduction controlling device Q 2 connected in series with a control winding Nc of...
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6822881 |
Control device for a resonant converter
A resonant converter and a control method for a resonant converter are proposed. The resonant converter comprises a resonant circuit with a transformer, which circuit is supplied with power by an...
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6816395 |
Switching power source device
The present invention provides a switching power supply which includes a main rectifying and smoothing circuit ( 40 ) and a secondary rectifying and smoothing circuit ( 50 ) for rectifying and...
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6788556 |
Switching power source device
A switching power source device includes a peak current limiting circuit in which peak current flowing through a first switching element is detected, and when the current reaches a predetermined...
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6687137 |
Resonant switching power supply circuit with voltage doubler output
A switching power supply circuit includes an insulating converter transformer where the insulating converter transformer has a gap formed therein so that a coupling which is efficient for a loose...
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6654258 |
Resonant power supply circuit
A resonant power supply circuit includes a flyback transformer. A first FET and a power supply are connected to a primary winding of the flyback transformer. A resonant capacitor and a damper diode...
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