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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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8164928 |
Method and apparatus of operating a primary-side-regulation power converter at both continuous current mode and discontinuous current mode
A method and an apparatus of operating a primary-side-regulation power converter at both continuous current mode and discontinuous current mode are provided. The apparatus includes a switching...
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8125798 |
Constant current and voltage controller in a three-pin package operating in critical conduction mode
A self-oscillating flyback converter includes a controller integrated circuit housed in a 3-pin package. A switch control terminal is coupled to the base of an inductor switch that controls the...
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8098502 |
System and method for emissions suppression in a switched-mode power supply
In one embodiment, a method of operating a switched-mode power supply that has a switch coupled to a drive signal is disclosed. The method includes deactivating the drive signal at a first instance...
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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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8089783 |
Constant current and voltage controller in a three-pin package with dual-use switch pin
A flyback converter includes a controller integrated circuit (IC) housed in an IC package with only three terminals. The controller IC is grounded through a ground terminal. A feedback signal is...
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8085560 |
Power supply apparatus
A power supply apparatus includes: a transformer which converts input power supplied to a primary winding to be induced to a secondary winding; a current detector which detects an output current of...
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8086355 |
Method, a system, a computer-readable medium, and a power controlling apparatus for applying and distributing power
Embodiments of the invention relate generally to power management and the like, and more particularly, to an apparatus, a system, a method, and a computer-readable medium for providing power...
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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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8064231 |
Short circuit protection circuit for a pulse width modulation (PWM) unit
A short circuit protection circuit for a pulse width modulation (PWM) unit which includes a PWM logic control circuit, an under voltage lookout (UVLO) circuit and an internal clock circuit; wherein...
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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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8045344 |
Regulating output current from a primary side power converter by clamping an error signal
An inductor current flows through an inductor of a flyback converter. In a constant voltage mode, the pulse width of an inductor switch control signal is adjusted to maintain a constant output...
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8031492 |
PWM controller for compensating a maximum output power of a power converter
A PWM controller having an oscillator, a control circuit and a two-level limiter is provided. The oscillator generates a pulse signal. The control circuit couples to the oscillator for generating a...
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8031493 |
Method and apparatus for improving the light load efficiency of a switching mode converter
A method and apparatus are provided for a switching mode converter to improve the light load efficiency thereof. The converter is thus operated with three modes by monitoring a feedback signal and...
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8023292 |
Switching control device
The present invention reduces switching noise generated in a switching control device having a switching element such as a switching power supply in linear linkage with the state of a load of the...
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8018742 |
Full-range-duty PWM signal generation method, apparatus, and system using same
The present invention discloses a full-range-duty PWM signal generation method for an AC-to-DC power conversion, comprising the steps of: generating a saw-tooth signal with a predetermined valley...
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8018741 |
Adjusting for conductor loss to regulate constant output voltage in a primary feedback converter
A lower-cost and more precise control methodology of regulating the output voltage of a flyback converter from the primary side is provided, which works accurately in either continuous voltage mode...
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8018743 |
Adaptive control for transition between multiple modulation modes in a switching power converter
In a switching power converter, PWM mode and PFM mode are separated into two independent control sections with the control voltage range in each control section determined independently. Each of...
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7983061 |
Switching controller capable of reducing acoustic noise for power converters
The present invention provides a switching controller capable of reducing acoustic noise of a transformer for a power converter. The switching controller includes a switching circuit, a comparison...
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7978484 |
Flyback constant voltage converter having both a PWFM mode and a PWM mode
A flyback AC/DC switching converter has a constant voltage (CV) mode. The CV mode has sub-modes. In one sub-mode (“mid output power sub-mode”), the output voltage (VOUT) of the converter is reg...
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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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7969753 |
Maintaining a constant output voltage by sampling and holding a voltage across an auxiliary winding
A lower-cost and more precise control methodology of regulating the output voltage of a flyback converter from the primary side is provided, which works accurately in either continuous voltage mode...
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7965524 |
Method and apparatus to reduce audio frequencies in a switching power supply
A controller for use in a power supply regulator is disclosed. One controller includes a feedback circuit coupled to generate a feedback current signal that corresponds to a peak switching current...
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7960952 |
Switching mode power supply and switch thereof
A switching mode power supply and a switch thereof are provided. The switch includes a plurality of first transistors, and a second transistor that is turned on/off by a control signal that is...
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7957162 |
Switch mode power supply and driving method thereof
The present invention relates to a switch mode power supply and a driving method for reducing switching loss and audible noise in the burst mode. The switch mode power supply includes a main...
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7911814 |
Constant current and voltage controller in a three-pin package with dual-use power pin
A flyback converter includes a controller integrated circuit (IC) housed in an IC package with only three terminals. An inexpensive TO-92 transistor package can be used. A switch terminal is...
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7903435 |
Switching controller having switching frequency hopping for power converter
A switching controller having switching frequency hopping for a power converter includes a first oscillator generating a pulse signal and a maximum duty-cycle signal for determining a switching...
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7898823 |
Quasi-resonant fly-back converter without auxiliary winding
Disclosed is a switching converter without an auxiliary winding. The switching converter has a transformer, a switching transistor, a coupling circuit and a regulating circuit. The transformer has...
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7869231 |
System and method for synchronous rectifier drive that enables converters to operate in transition and discontinuous mode
A synchronous rectifier is switched in accordance with a primary switch transition and a reference signal representing current in a current storage device to which the synchronous rectifier is...
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7869771 |
Multi-band transformer for wireless transmitter
Various embodiments are disclosed relating to wireless transmitters, and also relating to multi-band transformers. According to an example embodiment, an apparatus may include a multi-band...
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7869235 |
Flyback converter having an active snubber
A flyback converter having an active snubber includes a transformer to receive input power. The transformer has a primary winding at a first side. The active snubber is coupled in parallel with two...
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7859864 |
Switching power supply device
A switching power supply device has lower correction circuit losses, and enables adjustments without affecting overcurrent limiting or other characteristics. An integrated circuit IC for power...
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7852640 |
System and method for providing control for switch-mode power supply
System and method for providing control for switch-mode power supply. According to an embodiment, the present invention provides a system for regulating a power converter. The system comprises a...
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7839662 |
Power supply having a flyback topology and current sense transformer
A power supply having a flyback topology includes a flyback transformer and a current sense circuit that outputs a current signal indicative of a current output by the power supply. The current...
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7817447 |
Accurate voltage regulation of a primary-side regulation power supply in continuous conduction mode operation
A power converter operates in continuous conduction mode and outputs a regulated output voltage. A feedback-derived signal is used to regulate the output voltage. The feedback-derived signal is...
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7808802 |
Isolated switched-mode power supply with output regulation from primary side
Embodiments disclosed herein describe an isolated switched-mode power supply with its output regulated from the primary side, by generating a sensing current using a sensing element coupled to the...
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7787263 |
Methods and apparatus to control a digital power supply
Methods and apparatus to control a digital power supply are disclosed. An example method includes controlling a power factor controller by: receiving a first current signal flowing in a first stage...
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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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7778051 |
Output current control circuit for power converter with a changeable switching frequency
A control circuit controls the output current of the power converter at the primary side of the transformer. The control circuit includes a current-detection circuit for generating a...
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7778049 |
Switching power supply
A switching power supply is provided which keeps constant, even when the oscillation frequency of a switching element increases, the on duty of secondary current passing through a secondary...
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7778050 |
Energy transfer device and energy transfer control semiconductor device
The present invention includes a turn-off signal modulating circuit that periodically varies a turn-off timing of a switching element 2 at a preset modulation time after a current detection by a...
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7764519 |
Control circuit and method for controlling switching power supply
Control circuit and method for controlling a switching power supply, which regulates its output voltage using pulse-width modulation (PWM) that switches on and off a main switch with a PWM signal...
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7760520 |
Current controlled switching mode power supply
A current controlled switching mode power supply is provided. A turn on/off time of a switching device is adjusted by controlling a leading edge blanking (LEB) time and an external drive current of...
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7760519 |
Primary only control quasi resonant convertor
A power supply apparatus and method of regulating is provided. A converter circuit includes a primary switching element and an auxiliary switching element. The auxiliary switching element is for...
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7755915 |
Power supply circuit with at least one feedback circuit feeding operating state of transformer back to pulse width modulation circuit thereof
An exemplary power supply circuit (20) includes a first commutating and filter circuit (21), a transformer (24), a second commutating and filter circuit (25), a transistor (27), a pulse width...
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7746673 |
Flyback constant voltage converter having both a PWFM mode and a PWM mode
A flyback AC/DC switching converter has a constant voltage (CV) mode. The CV mode has sub-modes. In one sub-mode (“mid output power sub-mode”), the output voltage (VOUT) of the converter is reg...
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7733673 |
Method and apparatus to reduce audio frequencies in a switching power supply
A controller for use in a power supply regulator is disclosed. One controller includes a feedback circuit coupled to generate an equivalent switching frequency signal in response to a sense signal...
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7729137 |
Switching power supply and regulation circuit
The present invention provides a switching power supply that enables a reduction in noise without the need for an anti-noise component such as a filter circuit. A secondary current on period...
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7729136 |
Isolated DC-DC converter
In an isolated DC-DC converter, an on-period control circuit generates an off-timing signal when the output voltage of an isolated DC-DC converter exceeds a reference voltage. A signal...
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7719860 |
Power supply and its controlling method
When an AC power supply (9) is powered up, a constant current supply section (14) supplies a constant current to a capacitor (C3) to charge the capacitor (C3). When a voltage across the capacitor...
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