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8184459 |
Switching power supply apparatus
A switching power supply apparatus employing a voltage obtained by rectifying an output from an AC power supply, as an input thereof includes a switching control circuit. The switching control...
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8184456 |
Adaptive power converter and related circuitry
A resonant power converter circuit stage can be configured to: i) receive a rectified voltage derived from an AC input voltage; ii) convert the rectified voltage to an internal voltage based on the...
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8144484 |
Electronic circuit control element with tap element
A technique for controlling a power supply with power supply control element with a tap element. An example power supply control element includes a power transistor that has first and second main...
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8120097 |
Method and apparatus for controlling a circuit with a high voltage sense device
A control circuit with a high voltage sense device. In one embodiment, a circuit includes a first transistor disposed in a first substrate having first, second and third terminals. A first terminal...
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8094468 |
Control circuit having off-time modulation to operate power converter at quasi-resonance and in continuous current mode
A control circuit is developed to adaptively operate a power converter at quasi-resonance (QR) and in a continuous current mode (CCM) to achieve high efficiency. The control circuit includes a PWM...
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8081041 |
Glue-logic based method and system for minimizing losses in oversampled digitally controlled DC-DC converters
A practical method and system for oversampled digitally controlled DC-DC converters is presented. To minimize the switching losses while maintaining all advantages of the oversampling, “glue l...
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8051317 |
Power supply with remotely adjustable output
A power supply system allowing remote adjustments of the power output of the power supply unit without having to physically access the power supply unit itself is disclosed. A power supply system...
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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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7974110 |
Switching power supply unit and method for setting switching frequency
A switching power supply unit is provided which provides improved response for frequency switching with a smooth rise in voltage. The switching power supply unit includes: a rectifier circuit for...
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7965522 |
Low-loss noise-resistant high-temperature gate driver circuits
High temperature gate driving circuits with improved noise resistance and minimized loss are implemented with high temperature components with a reduced size magnetic isolation transformer. Input...
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7944085 |
Multiple output switching power source apparatus including multiple series resonant circuits
A multiple output switching power source apparatus includes first and second switching elements Q1 and Q2, a first series resonant circuit connected in parallel with Q1 or Q2 and having a first...
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7916506 |
Control device for use in a resonant direct current/direct current converter
A control device for controlling a switch unit of a resonant direct current/direct current converter includes a frequency modulation controller and a pulse selector. The frequency modulation...
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7915938 |
Multi-channel digital pulse width modulator (DPWM)
A multiple channel Digital Pulse Width Modulator (DPWM) can include a single delay locked loop with a delay line, the delay line producing a number of outputs. Circuitry can use a delay line mask...
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7911812 |
Control arrangement for a PFC power converter
In a PFC (Power Factor Correction) converter control unit, a PWM (pulse width modulated) signal is produced by comparing a PFC converter output voltage error signal, produced by a transconductance...
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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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7876067 |
High frequency connector-less charging scheme
A connector-less charging circuit includes a transformer having a primary side associated with a secondary side. A primary switch is responsive to a control signal for connecting the transformer to...
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7872304 |
Method and apparatus for controlling a circuit with a high voltage sense device
A control circuit with a high voltage sense device. In one embodiment, a circuit includes a first transistor disposed in a first substrate having first, second and third terminals. A first terminal...
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7852648 |
Power supply control apparatus and method of using the same
A power supply control apparatus and method are provided. The apparatus includes a controller outputting a first pulse width modulation (PWM) signal for supplying an electric power and a second PWM...
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7834592 |
Circuit for generating triangular waveform having relatively short linear rise time and substantially long linear fall time
A circuit includes a pulse transformer having primary and secondary windings. An oscillating waveform is applied to the primary winding to induce an oscillating waveform at the secondary winding. A...
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7825622 |
Load driving method and device
A load driving device controls two motors by PWM signals. When a standard duty ratio of the PWM signals is 50% and a level of a drive instruction is the standard duty ratio, the standard duty ratio...
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7796408 |
Half-bridge LLC resonant converter with self-driven synchronous rectifiers
The present invention discloses a half-bridge LLC resonant converter with self-driven synchronous rectifiers, which utilizes a primary IC controller and a gate driver to drive the secondary...
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7782635 |
DC converter with independently controlled outputs
A DC converter comprises a single primary circuit which is coupled to each of a plurality of output circuits in respective time periods, the coupling being provided by switching in the output...
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7697307 |
Power supply circuit for outputting steady voltage
An exemplary power supply circuit includes a transformer (21) having a primary coil (211) and a secondary coil (212); a rectification circuit and a transistor (26) respectively coupled to two...
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7696566 |
Method and apparatus for controlling a circuit with a high voltage sense device
A control circuit with a high voltage sense device. In one embodiment, a circuit includes a first transistor disposed in a first substrate having first, second and third terminals. A first terminal...
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7636247 |
Electronic circuit control element with tap element
A technique for controlling a power supply with power supply control element with a tap element. An example power supply control element includes a power transistor that has first and second main...
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7616458 |
PWM current controlling apparatuses capable of optimally correcting load current
In a current controlling apparatus for controlling a load current flowing through a load, a reference level generating circuit generates a reference level signal, and a reference signal generating...
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7616257 |
Apparatus for controlling power source in mobile electronic unit
An apparatus for controlling a power source in a mobile electronic unit using a variety of types of batteries that have different nominal voltages is provided. The apparatus includes a battery...
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7599201 |
Method of controlling the duty of a PWM signal, PWM signal generating circuit, and image forming apparatus using same
A PWM signal generating circuit that generates a PWM signal having a period controlling portion for slightly fluctuating a period of the PWM signal; and a duty controlling portion for changing a...
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7515393 |
Voltage regulator
According to one embodiment, a voltage regulator includes a switch configured to selectively conduct electrical energy according to a signal, and circuitry configured to provide the signal to...
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7505288 |
DC converter with independently controlled outputs
A DC converter comprises a single primary circuit which is coupled to each of a plurality of output circuits in respective time periods, the coupling being provided by switching in the output...
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7502233 |
DC power supply using either AC or DC input for both
There is provided a power supply for AC/DC and DC/DC conversion which receives the DC power supplied from airplanes, vehicles and vessels as well as normal AC power, and converts the power to DC...
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7499293 |
High voltage pulse power circuit
A pulse power source comprises a first circuit, a second circuit, a transformer for coupling the first circuit and the second circuit, and a switching controller. The second circuit comprises a...
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7480159 |
Switching-mode power converter and pulse-width-modulation control circuit with primary-side feedback control
A pulse-width-modulation control circuit of a switching-mode power converter with a primary-side feedback control is disclosed. The switching-mode power converter includes a transformer, a power...
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7436685 |
Piecewise on-time modulation apparatus and method for a power factor corrector
In a power factor corrector including a PWM switch to switch a line current generated from a line voltage to charge a boost capacitor to thereby generate an output voltage, a piecewise on-time...
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7400517 |
Power factor correction circuit and method therefor
In one embodiment, a power factor correction circuit is configured to use a stored value of a feedback signal to assist in regulating the value of an output voltage and to bypass the sample and...
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7365997 |
Synchronous switching control circuit for power converters
The present invention provides a synchronous switching control circuit for variable switching frequency power converters. It comprises a first circuit to generate a first signal in response to an...
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7362591 |
Power supply device and image forming apparatus
When a detected current value deviates from a range between an upper limit value and a lower limit value, a pulse width adjustment operation for increasing or decreasing a currently set counter...
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7333142 |
Power supply apparatus and actuator control apparatus
In accordance with the switching operation of a switching section, current is made to flow from a battery to an inductor repeatedly. A voltage generated at the inductor is smoothed by a condenser...
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7327178 |
Timing control circuit for lossless switching converter
A timing control circuit (70) generates staggered signals from a pulse width modulated signal (68) providing lossless switching in a DC to DC power converter (10). The DC to DC power converter (10)...
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7327113 |
Electric starter generator system employing bidirectional buck-boost power converters, and methods therefor
A bidirectional buck-boost power converter 13 including a pair of inverter modules 14, 15 disposed at an output of a machine, and an inductor Lo connected between the pair of inverter modules 14,...
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7321499 |
Method of forming a power supply controller and device therefor
In one embodiment, a power supply controller uses a ramp signal to form current sense ramp compensation.
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7313005 |
PWM circuit control method
In the PWM circuit of the present invention, a PWM counter counts clock signals. A reference value setting register sets a comparative reference value for determining a duty ratio of a PWM signal....
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7312783 |
Light emitting element drive device and display apparatus
A light emitting element drive circuit and a display system able to simultaneously perform constant current control and PWM control and able to perform a stable adjustment of luminance over a wide...
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7280375 |
Circuit arrangement for operating at least one light-emitting diode
A circuit arrangement is for operating at least one light-emitting diode LED in an electrical circuit at a service voltage greater than the forward voltage of the at least one light-emitting diode....
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7274575 |
AC coupled bias circuit for power converters
A switching power system for converting an input voltage to an output voltage across a transformer is disclosed. The system includes a control circuit. The control circuit has a control input...
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7265506 |
Noise improved linear DC motor control systems and methods
A linear power controller and related circuitry may be implemented to provide linear control of a variable DC electric motor. The controller and motor are coupled to form a closed loop for...
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7254045 |
Power supply circuit and electronic equipment
A power factor is improved using a simplified structure without particularly providing a power factor improving circuit, and high efficiency is obtained. For this purpose, one terminal of a...
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7236376 |
Controller for regulating output current at the primary side of a power supply
A controller controlling the output current at the primary side of a power supply is provided. A waveform detector generates a current-waveform signal. A second control circuit generates an...
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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 for...
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7199643 |
Hot swappable pulse width modulation power supply circuits
Hot swappable pulse width modulation power supply circuits preferably realized in integrated circuit form. The hot swap circuits provide for de-bouncing, controlled charging of the input capacitor...
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