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Document Title |
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8089791 |
Compensation circuit and compensation method for current mode power converters
A compensation circuit and a compensation method for providing compensation of a power converter are proposed. A current sense circuit is coupled to receive a switching current for generating a...
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8077487 |
Using output drop detection pulses to achieve fast transient response from a low-power mode
In a first aspect, in a Primary Side Regulation (PSR) power supply, some primary current pulses are used to forward bias an output diode such that an auxiliary winding voltage can be properly...
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8068354 |
Current-level controlling device for a power supply device and related power supply device
A current-level controlling device for a power supply includes a reception end for receiving a current sense signal, a reference voltage generator for generating a reference voltage, an adaptive...
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8064230 |
System and method for power conversion
A system and method for operating power supplies. A method comprises altering a current sense (CS) signal, turning off a switch of the converter in response to a determining that the CS signal is...
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8059431 |
Switching power supply
An object of the present invention is to provide a switching power supply which can stably determine whether an overcurrent occurs or not on the secondary side. A sample voltage corresponding to a...
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8014175 |
Switching power conversion circuit
A switching power conversion circuit includes a power circuit, a feedback circuit and a control circuit. The power circuit includes a switching circuit and a first magnetic element. The first...
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8008870 |
Constant-current drive circuit
A voltage supplied from a power supply is boosted by a boosting circuit unit to generate a direct-current voltage, and the pulse-shape direct-current voltage is applied to LED while a...
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8009448 |
Forward-flyback converter with active-clamp circuit
The present invention discloses a forward-flyback converter with active-clamp circuit. The secondary side of the proposed converter is of center-tapped configuration to integrate a forward circuit...
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7990739 |
Asymmetrical resonant power converters
A resonant power converter is provided and includes a capacitor, an inductive device, a first transistor, a second transistor, and a control circuit. The capacitor and the inductive device develop...
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7902767 |
AC inverter capable of driving multiple lamps for LCD panel backlight
An AC inverter circuit supplies power to multiple lamps in an LCD backlight. Conventional AC power is used as direct input into a full wave rectifier that converts the input from AC to a DC...
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7893630 |
Royer oscillator with discharge electronics
The field of the invention is mainly that of light boxes used for the illumination of display screens using optical valves, notably for liquid crystal matrix displays also known as LCD screens. The...
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7821800 |
Power adapter for providing output power limiting and load-dependent voltage regulation
Disclosed is a power adapter having a voltage limiting circuit for limiting an output voltage of the power adapter at a predetermined voltage level when an output current of the power adapter is...
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7733672 |
Programmable conduction mode control for switching circuits
A control system that controls a switching circuit having a switching element and an inductive element coupled to an output of the switching element. The control system includes a switching control...
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7696737 |
Method and apparatus to control a power supply for high efficiency
A power supply control circuit is disclosed. In one aspect, a power supply control circuit includes a controller to be coupled to a switch to regulate an output of a power supply in response to a...
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7649280 |
Method and circuit for cross regulation in a power converter
A power equalization circuit in a transformer-based device having a plurality of isolated voltage outputs is provided. The circuit comprises: a threshold detection circuit configured to receive an...
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7639517 |
Adaptive output current control for switching circuits
System and methodology for controlling output current of switching circuitry having an input circuit and an output circuit electrically isolated from each other. A value of the output current may...
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7636246 |
Start-up time reduction in switching regulators
A start-up time accelerator is described for a switch controller that controls turning on or off a switch in a switching regulator. The start-up time accelerator uses the switch as a current...
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7589985 |
Switching Regulator
A switching regulator is configured as a fixed-voltage regulator and contains a voltage divider. The voltage divider is supplied with a voltage signal available from a regulator output via a first...
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7570498 |
Switching power supply apparatus for correcting overcurrent detection point based on gradient of switching current
A switching power supply apparatus has a switching device control circuit for performing overcurrent protection by controlling switching-on/off of a switching device, connected serially to a...
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7570497 |
Discontinuous quasi-resonant forward converter
A discontinuous resonant forward power converter including a controller having an output coupled to a controllable switch and which is configured to control the switch such that a voltage waveform...
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7548437 |
Switching mode power supply
A switching mode power supply (SMPS) is presented to compensate for variations of maximum output power caused by variations of input power. The output power varies according to variations of input...
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7535121 |
High voltage power supply apparatus and method of correcting current output from the apparatus
A high voltage power supply apparatus and a method of correcting current output from the high voltage power supply apparatus. The high voltage power supply apparatus includes a switching unit; a...
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7531970 |
Power source driving circuits and controllers thereof
A controller for a driving circuit of power source comprises a frequency generator, a pulse width modulator, and a driving device. The frequency generator comprises a latch circuit. The frequency...
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7440295 |
Switching mode power supply with active load detection function, and switching method thereof
A switching mode power supply (SMPS) with an active load detection function which supplies AC power input to a primary coil of a transforming element, then to a secondary coil of the transforming...
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7394668 |
Switching power supply circuit and frequency converter
An object of the present invention is to lower the voltage applied to the starting resistor of the starting circuit in a switching power supply circuit to reduce the power loss especially when the...
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7385831 |
Power supply device and vehicle lamp
A power supply device includes: a regulator transformer; a primary switch for selectively supplying a current to the regulator transformer; a control circuit for reducing to 0, following each...
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7382062 |
Wide voltage range stabilized switching power supply for valve actuators
The invention finds application in the field of power supplies for valve actuators, and particularly relates to a wide voltage range stabilized switching power supply for valve actuators, of the...
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7345431 |
Circuit structure for driving a plurality of cold cathode flourescent lamps
A DC/AC converter circuit structure for driving a plurality of cold cathode fluorescent lamps is described. A common-mode choke is used between the cold cathode fluorescent lamps. The common-mode...
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7327586 |
Power supply unit and lighting device for vehicle
A power supply unit comprises: a voltage output section for supplying a voltage to a plurality of loads connected in parallel with each other; and a plurality of output side coils provided...
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7298632 |
Secondary current compensation method
Techniques for correcting for internal resistance losses in the secondary windings of a transformer to reduce errors in output voltage from a high voltage power supply.
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7274574 |
Magnetically controlled transformer apparatus for controlling power delivered to a load with current transformer feedback
A circuit with a magnetically variable transformer having primary and secondary windings wound on a magnetic core wherein the transformer core with associated windings is placed in close proximity...
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7259525 |
High efficiency switching LED driver
The present invention provides a LED driver for control the brightness of the LED. An inductor and a switch are connected in serial with the LED for control the current of the LED. A control...
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7248486 |
Energy efficient switching converter
A switching converter in which an input voltage can be switched by means of at least one controlled switch to at least one primary winding of a transformer, with a control circuit for controlling...
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7239533 |
DC power supply apparatus
A DC power source device comprises a MOS-FET 5 which performs the intermittent switching operation for converting DC input from a DC power supply 1 into high frequency electric power; a control...
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7233117 |
Inverter controller with feed-forward compensation
The present invention is an inverter controller with feed-forward compensation. The inverter controller includes an error amplifier, a high frequency oscillator (HFOSC) with feed-forward...
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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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7136292 |
Power supply and method for regulating supply voltage
In a preferred embodiment, there is provided a switched mode power supply operable in start-up mode, normal mode and standby mode. The power supply may comprise a transformer having a primary...
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7116087 |
Current sharing method and apparatus for alternately controlling parallel connected boost PFC circuits
The provided method and control circuit are employed to alternately control the dual boost PFC circuits. The control circuit for alternately controlling parallel-connected first and second boost...
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7116563 |
Dual mode over-current protection for switching mode power converter
A control circuit for a switched mode power converter is adapted to receive a current sense signal reflecting the output current of the power converter and a feedback signal reflecting the output...
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7054169 |
Switched-mode power supply supporting burst-mode operation
A switched-mode power supply (SMPS) that operates in a burst mode when an electronic device that receives power from the SMPS demands a low level of power as when in a stand-by mode or cut-off...
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7046524 |
Power supply device comprising several switched-mode power supply units that are connected in parallel
The invention relates to a power supply device having several switch-mode power supplies connected in parallel to supply at least one consuming unit, each switch-mode power supply generating an...
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7038432 |
Linear predictive controller
A linear predictive system for a DC—DC converter including a linear predictive controller, first and second adders and a multiplier. The DC—DC converter generates an output signal and includes a d...
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7009854 |
Inverter transformer and inverter circuit
In the present invention, the safeguarding of the circuit and the step-up transformer can be devised without using the special high-cost components. Voltage supplied by the primary coil (21) of a...
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6665197 |
Circuit configuration for producing a switching signal for a current-controlled switch-mode power supply
A circuit configuration for generating a switching signal for a current controlled switched mode power supply includes a transformer with windings, a controlled power breaker, in series with a...
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6646897 |
Method and system of slow output voltage ramp control for a power supply
A pulse width modulation controller is coupled to a feedback voltage that is proportional to the power supply output voltage. The controller adjusts a current sense threshold in the controller in...
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6639812 |
Power supply control circuit that adjusts output power based on variable input power
A power supply control circuit connectable with an input power monitor that monitors an input power value to the power supply, an output power monitor that monitors an output power value from the...
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6621235 |
Integrated LED driving device with current sharing for multiple LED strings
An integrated LED driving device for multiple LED strings which employs a single linear regulator or other controller and a multiple-output current mirror which is almost independent of the DC...
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6549429 |
Switching-power supply unit for reducing power consumption in a stand-by-mode
In a normal operation mode, a mode changeover controller 8 continuously operates a PWM control circuit 6 so as to operate a switching element 5 at the basic oscillation frequency. In a standby...
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6381152 |
Method of driving semiconductor switching device in non-saturated state and power supply apparatus containing such a switching device
A power supply apparatus includes a semiconductor switching device for outputting power and a control circuit for controlling the on/off operation of the semiconductor switching device. The control...
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6320766 |
Power-saving circuit for an AC/DC adaptor for a portable computer
A power saving circuit of an AC/DC adaptor for a portable computer including an input until converting an AC voltage into a DC voltage; a power transistor; a transformer inputting the DC voltage...
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