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7643320 |
Isolated resistive signature detection for powered devices
In one embodiment, a load connected to power sourcing equipment (PSE) compatible with a Power over Ethernet (PoE) standard is characterized to determine whether the load corresponds to a valid...
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7643322 |
Dual loop constant on time regulator
A circuit for improving the regulation of a current or voltage output using a constant-on-time regulator. The circuit uses a dual sense loop design. One sense loop is used to adjust a reference...
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7643315 |
Programmable feedback voltage pulse sampling for switched power supplies
Disclosed is a method and apparatus that includes a power supply having a primary coil and a secondary coil. The secondary coil generates an output voltage and a feedback voltage related to the...
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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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7638991 |
System and method for providing switch size management in a DC-DC converter circuit for a RF power amplifier using an output voltage reference signal
A system and method are disclosed for providing switch size management in a direct current to direct current (DC-DC) converter circuit for a radio frequency (RF) power amplifier. An output voltage...
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7639514 |
Adaptive inductive power supply
A contactless power supply has a dynamically configurable tank circuit powered by an inverter. The contactless power supply is inductively coupled to one or more loads. The inverter is connected to...
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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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7630219 |
DC to DC converter for decreasing switching loss according to the turn-on/turn-off state of a switch
A direct current (DC) to DC converter is provided. The DC to DC converter includes: a transformer which comprises a primary winding which is connected in series with an input voltage and a...
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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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7616455 |
Power factor correction using current sensing on an output
A method and apparatus for circuit conditioning, such as for providing power factor correction, is provided, using existing or minimal additional circuitry, at minimal or no additional cost to the...
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7609533 |
Light-load efficiency improving method and apparatus for a flyback converter
A flyback converter has a controller to switch a power switch so as to convert an input voltage to an output voltage for a load by monitoring an output voltage dependent signal and a current...
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7602627 |
Electrical power source, operational method of the same, inverter and operational method of the same
The present invention is an electric power source in which a plurality of inverters operate on the same frequency and the plurality of inverters are connected in parallel so that a resistance value...
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7599202 |
DC-AC converter with feedback signal control circuit utilizing power supply voltage, controller IC therefor, and electronic apparatus utilizing the DC-AC converter
An inverter controls the power supplied to a load such as a CCFL connected to a secondary winding of a transformer by means of pulse width modulation (PWM) control of the switches of a...
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7590087 |
Methods for wireless data transmission between a base station and one or more transponders
A method and device for wireless data transmission between a base station and one or more transponders, in which electromagnetic carrier waves are emitted by the base station and symbols are...
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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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7586770 |
Interconnection inverter device
An interconnection inverter device includes a pair of capacitors connected in series to a pair of direct-current buses each connecting a direct-current power supply and the inverter; an...
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7564704 |
Method of forming a power supply controller and structure therefor
In one embodiment, a power supply controller is configured to switch a power switch of a power supply when a voltage across the switch is at a minimum value.
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7561452 |
Transformer-isolated flyback converters and methods for regulating output current thereof
A system and method for delivering regulated power and current to an output load has a flyback transformer having a primary winding and a secondary winding. The secondary winding delivers stored...
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7558093 |
Power converter with emulated peak current mode control
A power converter includes a switch controller generating a pulse signal controlling a switch to emulate peak current mode control. The switch controller generates a control voltage from a...
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7558084 |
Switching mode power supply with compensated propagation delay
A switching mode power supply includes a power supply, a feedback circuit, and a switching controller. The power supply includes a main switch coupled to a primary coil of a transformer and...
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7551464 |
Current overloading proof switch power supply and its IC
The present invention provides a method for preventing current overloading and saturation of a switch power supply, including one of the steps of checking whether a primary current of an...
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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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7551459 |
Zero voltage switching coupled inductor boost power converters
The subject invention reveals a new coupled inductor boost converter which achieves zero voltage turn on switching for all four circuit switches. The coupled inductor of the circuit is fully...
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7541695 |
Uninterruptible power supply with low power loss
Disclosed is an uninterruptible power supply including a controller; a first switch circuit; a second switch circuit; a transformer having a first winding connected to a load and the first switch...
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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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7542313 |
Induction heating apparatus capable of stably operating at least one switching element contained therein
An induction heating apparatus capable of stably operating at least one switching element contained therein is provided with a control circuit 5 which comprises a resonance waveform detector 6 ...
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7539028 |
Method and apparatus for fault detection in a switching power supply
Techniques are disclosed to detect a fault in the feedback circuit of a switching power supply while the power supply operates in a mode where the output is below its regulated value. The power...
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7532001 |
Q-boosting circuit
Provided is a Q-boosting circuit for improving a Q factor in a radio frequency (RF) integrated circuit of a semiconductor device using a transformer instead of an inductor. The Q-boosting circuit...
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7532488 |
DC converter
A primary winding 5 a of a transformer T and a switch Q 1 are connected in series with a DC power source Vdc 1 . A series circuit composed of a switch Q 2 and a snubber capacitor C 3 is...
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7528588 |
Method and circuit for limiting output voltage in a switched-mode power supply and a switched-mode power supply
A switched-mode power supply ( 200, 300, 400 ) comprises a primary side, a secondary side and a transformer ( 103, 303, 403 ) therebetween. An output on the secondary side delivers an output...
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7529105 |
Configuring a power converter to operate with or without burst mode functionality
In one embodiment, a method is provided for a power converter system. The method includes: automatically configuring the power converter system to operate with burst mode functionality if a control...
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7525824 |
Method to control a frequency converter
A method for the control of a static frequency converter, in which an alternating voltage provided by a generator with a first frequency is first rectified in a switched rectifier, and in which the...
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7515442 |
Secondary side controller and method therefor
In one embodiment, a secondary side power supply controller is configured to enable a secondary side power switch independently of a state of a drive signal used to control a primary side of the...
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7515444 |
Converter with selective current mode and voltage mode controlled switching
A switched mode converter is disclosed that includes both voltage mode and current mode control. The switched mode converter also includes mode logic for switching between a voltage mode and a...
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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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7511978 |
System and method for providing switching to power regulators
System and method for providing switching to power regulators. According to an embodiment, the present invention provides system for providing switching. The system includes a first voltage supply...
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7511472 |
Power measuring apparatus
A power measuring apparatus including a voltage transformer, a voltage-current measuring circuit, and an operation unit is provided. The voltage transformer converts an input voltage signal into an...
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7498790 |
Switching regulator frequency control
A system may include a voltage controller to provide a control signal, a voltage converter to receive the control signal and to change a value of an output voltage in response to the control...
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7499295 |
Switch mode power supply controllers
This invention generally relates to discontinuous conduction mode switch mode power supply (SMPS) controllers employing primary side sensing. We describe an SMPS controller which integrates a...
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7495938 |
DC voltage balance control for three-level NPC power converters with even-order harmonic elimination scheme
Three-level inverter and rectifier power conversion systems and space vector modulation (SVM) controls having even-order harmonic elimination for neutral voltage balancing with a predefined vector...
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7495410 |
Systems and methods for improved motor drive power factor control
Systems and methods are described for controlling power factor in motor drives having a switching rectifier providing a DC link current to an inverter in which the rectifier gain is increased to...
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7492615 |
Switching power supply
A feedback circuit ( 3 ) generates an error amplification signal VEAO for stabilizing an output voltage Vo at the reference voltage. The reference voltage is set beforehand in the feedback circuit...
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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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7486528 |
Linear-predict sampling for measuring demagnetized voltage of transformer
A linear-predict sampling circuit is developed to generate a feedback signal by detecting a demagnetized voltage of the transformer. A switching signal is generated in response to the feedback...
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7483281 |
Multi-channel power converter with switching frequency modulation circuit for power saving
The present invention provides a control circuit for a multi-channel power converter to save power at light load. The control circuit comprises a modulation circuit and an oscillation circuit to...
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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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7477534 |
Off-line converter with digital control
A DC to DC converter comprising an energy storage element comprising an energy storage element input and an energy storage element output, the energy storage element input coupled to receive a...
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7471531 |
Programmable feedback voltage pulse sampling for switched power supplies
Disclosed is a method and apparatus that includes a power supply having a primary coil and a secondary coil. The secondary coil generates an output voltage and a feedback voltage related to the...
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7471530 |
Method and apparatus to reduce audio frequencies in a switching power supply
An apparatus and method of switching a switch of a power supply are disclosed. According to aspects of the present invention, a method includes controlling a switch of a switching power supply to...
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7471523 |
Method and apparatus for detecting demagnetizing time of magnetic device
A detection circuit for detecting the demagnetizing time of a magnetic device is provided. An input circuit is coupled to the magnetic device for detecting a magnetizing voltage and a demagnetizing...
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