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7635956 |
Primary side constant output voltage controller
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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7630215 |
Power apparatus and method to provide high voltage
A power apparatus and method thereof include first and second signal processing units. The first signal processing unit filters and adjusts a first inputted PWM signal in a predetermined bandwidth...
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7624289 |
Power network reconfiguration using MEM switches
A structure and method for power distribution to a network for an integrated circuit chip complex are provided. The chip complex has at least two sectors, each having at least one power providing...
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7619904 |
Pulse signal drive circuit
A pulse signal drive circuit includes an energy storage device. A source of energy supplies a substantially constant flow of energy to the energy storage device. A switch circuit draws repetitive...
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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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7616461 |
Control method and circuit with indirect input voltage detection by switching current slope detection
The present invention provides a method and a control circuit to detect an input voltage for the control and protections of a power converter. It includes a current sense circuit for generating a...
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7613017 |
Gated pulse power converter systems and methods
The present invention is generally directed to power converter systems and methods that regulate an output voltage by gating a fixed energy pulse. For example, a comparator may be used to gate a...
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7605573 |
Switching regulator providing slope compensation and voltage control method thereof
A CMC-type switching regulator is disclosed that includes: a switching element switching to control outputting of input voltage; a smoothing circuit outputting the smoothed output voltage of the...
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7598680 |
Electronic power protection circuit and applications thereof
An electric power protection circuit connected in series to a secondary side circuit of a transformer in a switch mode power supply includes a voltage/current limiting device to get an electric...
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7589301 |
Induction heating device having plural resonant circuits
A heating circuit includes a first heating coil provided adjacent to an object to be heated. A first capacitor is provided in parallel to the first heating coil, the first capacitor being a...
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7586761 |
Converter having a plurality of channels
A converter having a plurality of channels includes a transformer having a primary winding and at least one secondary winding. A first switch connected to the primary winding chops a substantially...
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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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7567066 |
Integrated switch with internally adjusted conduction time
An apparatus and method of providing a pulse width modulated signal that is responsive to a current are disclosed. An integrated circuit according to aspects of the present invention regulates an...
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7568117 |
Adaptive thresholding technique for power supplies during margining events
Adaptive thresholding technique for power supplies during margining events. A power supply may include a fault detection mechanism for monitoring an output voltage of the power supply to determine...
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7567444 |
Multi-output DC-DC converter with improved cross-regulation performance
A multi-output DC-DC converter that can optimize its cross-regulation performance is proposed, in which a nonlinear inductive element functioning as a leakage inductance of an output coupled...
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7567447 |
Electrical switching device having current balanced transistors
An electrical switching device having a plurality of parallel coupled IGBTs is provided. The electrical switching device balances electrical currents in each of the IGBTs that are supplied to a load.
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7564903 |
Method and apparatus for measuring reflected voltage of transformer
A method and apparatus of sampling reflected voltage signal of a transformer is proposed. Sampling signals are used for generating hold voltages by sequentially sampling the reflected voltage from...
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7542308 |
DC-DC converter
A DC-DC converter is provided with a control circuit 6 which comprises a drive signal generator 11 for producing on-off signals to a control terminal of a MOS-FET 3 in synchronization with...
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7535734 |
High power-factor AC/DC converter with parallel power processing
The present invention is an AC/DC (alternating current to direct current) converter. The converter contains two semi-stages. One is the boost-flyback semi-stage that has excellent self-PFC property...
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7515441 |
Switching power supply
A switching power supply, in which a switching element turns on and off electric current flowing on the primary side of an output transformer so as to rectify and output a pulsating flow generated...
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7511974 |
High voltage charging circuit
A high voltage charging circuit is provided with the ability of rapid charging. The circuit is composed of a turn-on control circuit, a turn-off control circuit and a transistor. The turn-on...
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7511973 |
Constant current mode ripple attenuation method in flyback power supply
A modification of a control loop of a primary side sensing power control system that uses a different and unique relationship to accomplish the constant current control while attenuating the...
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7504868 |
High-side switch with a zero-crossing detector
A circuit arrangement comprising a high-side semiconductor switch with a first load terminal connected to a first supply terminal receiving an input voltage, a second load terminal connected to an...
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7505287 |
On-time control for constant current mode in a flyback power supply
The present invention is a system and a method that controls the current limit such that it is maintained within a small range for any acceptable input voltages, e.g., 90 to 264 Volts RMS, causes...
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7502235 |
Output power limit for a switching mode power converter by a current limit signal having a multi-slope waveform
A current limit signal having a multi-slope waveform is provided for a power converter that has a power switch switched to convert an input voltage to an output voltage, for output power control...
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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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7492611 |
Intelligent power-supplying device
An intelligent power-supplying device includes an alternating current (AC) input port, a direct current (DC) input port, a displayer, a reset key and a DC output port. The AC input port receives an...
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7492613 |
Control circuit of power converter having adaptive bias for detecting reflected voltage of transformer
A control circuit for detecting the reflected voltage of a transformer is provided. A detection circuit is developed for sampling the reflected voltage. Because the pulse width of the reflected...
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7492614 |
Switching power supply apparatus
There are included an actuation unit supplying an actuation power to a control unit to start a switching operation of a switching element when an alternating-current power sources turned on, and...
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7492619 |
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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7489528 |
Power supply control method, current-to-voltage conversion circuit and electronic apparatus
A power supply control method is adapted to a current-to-voltage conversion circuit which has a transformer for converting and outputting an input power. The power supply control method stops a...
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7489532 |
Apparatus and method for a power converter with feed-forward voltage compensation to enable a PFC circuit
Apparatus and method for a power converter with feed-forward voltage compensation to enable a PFC circuit are proposed. A voltage divider and a feedback unit output a compensation voltage and a...
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7486030 |
Universal input voltage device
A universal input voltage device is presented which may receive a wide range of regulated and unregulated input voltages, both DC and a wide range of variable frequency AC, and output a desired...
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7480157 |
Power architecture for providing voltage modulation power
A power architecture for providing voltage modulation power is applied to a power supply including a PFC (Power Factor Correction) unit and a transformer, and the power supply further includes a...
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7477096 |
Radiation tolerant DC/DC converter with non-radiation hardened parts
A radiation tolerant high-power DC/DC converter is disclosed. The converter does not incorporate radiation-hardened parts, but instead uses p-channel FET switches that have a negative gate...
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7459659 |
Induction heating circuit and winding method for heating coils
A heating circuit for heating a conductive bowl includes a voltage source; a first heating coil provided between first and second nodes and being configured to heat the conductive bowl; a second...
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7450403 |
Switching power supply utilizing switch-selectable resistors to determine output voltage
A switching power supply includes a source of DC voltage and a transformer having primary and secondary windings. A switching circuit is coupled between the DC voltage and the primary winding to...
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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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7447047 |
Post regulation control circuit of power supply
In a post regulation control circuit mainly used in a switching power supply with several sets of outputs, the circuit adopts leading edge synchronization and conduction time regulation for the...
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7443700 |
On-time control for constant current mode in a flyback power supply
A primary side sensing power control system and method for constant current control that utilizes a relationship that involves the measured reset-time from the previous cycle to determine the...
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7440294 |
Power adapter and power supply system using the same
The present invention is associated with a power adapter capable of simultaneously providing a low-level DC voltage and a high-level DC voltage. The power adapter includes a transformer having a...
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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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7430130 |
D-optimized switching converter
A switching converter produces an output signal transmitted to a variable load impedance to produce a load voltage V DD across the load impedance and holds V DD close to a set point voltage V SP ...
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7403402 |
Method and apparatus for extending the operating range of a flyforward converter
A technique for extending the operating range of a flyforward converter to low input voltages. In one aspect, power converter includes a positive input supply rail and a negative input supply rail....
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7369420 |
Control circuit for isolated forward DC-to DC converters
An isolated DC-to-DC converter comprises a converter section configured to receive an input voltage and produce an isolated output voltage and a controller section configured to control the...
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7365996 |
Switched-mode power supply
A switched-mode power supply for converting a DC input voltage (Uzk) into an output voltage (Ua). The switched-mode power supply comprises a circuit (AST) for triggering at least one controlled...
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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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7355864 |
Switching regulator and its control method
A switching regulator has an input voltage detection circuit which inputs a voltage applied to a rectifier diode 7 connected in series with the secondary side of a transformer and generates a...
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7339805 |
Power supply having voltage blocking clamp
A power supply comprises a rectifier, a transformer, a switching member, a controller and a voltage blocking clamp. A power supply can receive an alternating current (AC) input voltage having any...
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7332900 |
Method and apparatus to reduce maximum power from a power supply with transition region regulation
Techniques are disclosed to regulate the output power of a power supply. An example regulator circuit includes a feedback circuit coupled to generate a feedback signal in response to an output of a...
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