Patent application number | Description | Published |
20080266908 | Control of a Resonant Converter - The invention deals with the control of a resonant LLC converter by use of control parameters. The primary current flowing in the resonant tank and a voltage at a predetermined point in the resonant tank are monitored and control parameters are set for a high side conduction interval and control parameters are set for a low side conduction interval, the control parameters for the two conduction intervals being: a peak current of the interval and a predetermined voltage of the interval. The resonant converter comprises series-arranged controllable switches to be connected to the supply source. The resonant converter is operated by setting up criteria for turning off a switch in accordance with criteria including the four control parameters. | 10-30-2008 |
20100033998 | CONTROL OF A RESONANT CONVERTER - The invention deals with the control of a resonant LLC converter by setting up criteria for state parameters of the resonant converter, so that the converter may be operated in a near capacitive mode. The current flowing in the resonant tank and optionally the voltage at the a predetermined point in the resonant tank are monitored, and wherein a switch (a high side switch or a low side switch) is turned off when a first criterion is fulfilled together with a second criterion or optionally a third criterion, the first criterion ensuring a minimum time has lapsed after the switch is turned on, the second criterion being that the absolute value of the current is reaching a predetermined current level, the third criterion being that the voltage at the predetermined point reaches a predetermined voltage level. | 02-11-2010 |
20100085782 | LOAD CURRENT DETECTION IN ELECTRICAL POWER CONVERTERS - A resonant converter comprises switching circuitry ( | 04-08-2010 |
20100208499 | STANDBY OPERATION OF A RESONANT POWER CONVERTER - A method of operating a resonant power supply in standby mode is disclosed, in which the switching period of the power supply is longer than the resonance period. The power converter is operated in normal mode for a significant fraction of one resonance period. Efficient operation is maintained, despite the switching period being extended beyond the resonance period, by using resonance current to enable soft switching, where this is beneficial, and dumping the resonance current into the load where this is more beneficial. Control methodologies to regulate the output power are also disclosed. | 08-19-2010 |
20110001362 | METHOD OF CONTROLLING A POWER FACTOR CORRECTION STAGE, A POWER FACTOR CORRECTION STAGE AND A CONTROLLER THEREFOR - In order to improve the efficiency of a Power Factor Convertor (PFC) first stage to a AC-DC converter the switching cell is split into two smaller ones (each comprising a switched inductor with an output diode). Below a certain load only one cell is active. The second cell only becomes active, out of phase with the first, but not generally in antiphase, after a predefined load level is surpassed in such a way that above that level the first cell has a fixed on time and the second cell a variable one. | 01-06-2011 |
20110002145 | METHOD OF OPERATING A RESONANT POWER CONVERTER AND A CONTROLLER THEREFOR - A method of operating a resonant power converter( | 01-06-2011 |
20110133722 | LOAD CURRENT DETECTION IN ELECTRICAL POWER CONVERTERS - An electrical power converter has a transformer ( | 06-09-2011 |
20110149608 | ELECTRICAL POWER CONVERTERS AND METHODS OF OPERATION - An electrical power converter includes a transformer ( | 06-23-2011 |
20110193612 | METHODS OF CONTROLLING A SYNCHRONOUS RECTIFIER - Consistent with an example embodiment, there is a method of controlling a synchronous rectifier having an input signal having oscillations therein and a switch which is switchable between an open state and a closed state. The method comprises filtering the input signal to produce a filtered signal, comparing the filtered signal with a reference value, and opening the switch in response to the comparison, in which the filtering is active filtering. | 08-11-2011 |
20110242856 | RESONANT CONVERTER - A resonant converter ( | 10-06-2011 |
20110255314 | SWITCHED POWER CONVERTER WITH EXTENDED HOLD-UP TIME - A power supply module having a PFC stage has a hold-up capacitor ( | 10-20-2011 |
20110261599 | CONTROLLER FOR A POWER CONVERSION CIRCUIT - A power conversion controller for controlling the operation of a switch in a power conversion circuit, wherein the power conversion controller is configured to operate the switch according to: a variable frequency mode of operation for switching frequencies greater than a minimum threshold value; and a fixed frequency mode of operation at a switching frequency equal to the minimum threshold value. | 10-27-2011 |
20110267024 | BURST MODE CONTROLLER AND METHOD - A method for controlling burst mode operation of a switched mode power supply (SMPS) is disclosed. The method comprises:
| 11-03-2011 |
20110280050 | POWER CONVERTER - The invention refers to a power converter and to a method for power conversion. The power converter includes a primary winding adapted to receive a primary alternating voltage. The converter further includes a first secondary circuit magnetically coupled to the primary winding, the first secondary circuit generating a first secondary output signal, the power converter further includes a second secondary circuit magnetically coupled to the primary winding. The power converter includes a post regulator adapted to be coupled to the second secondary circuit, the post regulator having a switch which is opened at every zero-crossing of the first output signal. | 11-17-2011 |
20110280051 | CONTROLLER FOR A SWITCHED MODE POWER SUPPLY (SMPS), A SMPS, AND A METHOD OF CONTROLLING A SMPS - According to an example embodiment, a controller for a Switched Mode Power Supply having opto-coupler-based feedback from secondary to primary side, is disclosed, in which the optocoupler current varies inversely with the output voltage over a voltage control range. The converter is thereby enabled to consume less power than do conventional converters, when in lower-power standby mode. Also disclosed are low-voltage startup and over-voltage protection arrangements combined with such a controller. Corresponding methods are also disclosed. | 11-17-2011 |
20110280053 | SMPS HAVING A SAFETY ARRANGEMENT, A METHOD OF OPERATING A SMPS, AND A CONTROLLER THEREFOR - A switched mode power supply (SMPS) is disclosed. The SMPS includes a mechanism for discharging charge stored in an input capacitor, upon the SMPS becoming disconnection from the mains, for instance by being unplugged. The SMPS includes a detector for detecting the disconnection of the mains, and a discharge circuit. The discharge circuit comprises a discharge element. The discharge element may be a part of the SMPS which is used otherwise, for instance, a high-voltage current source, or a bus capacitor or it may be an additional element, for instance a resistance load. The discharge circuit is adapted for, in response to the detector detecting a disconnection of the mains, discharging the input capacitor along a path. The detector controls a switch which engages the discharge circuit upon the detection. The switch forms a part of the discharge path. | 11-17-2011 |
20110317459 | CONTROLLER FOR A POWER CONVERSION CIRCUIT - A power conversion controller for controlling the operation of a switch in a power conversion circuit. The switch having a “time-on” property and a “clamping frequency” property, in use. The power conversion controller comprises a detector configured to detect one or more operational parameter values of the power conversion circuit, and a clamping frequency adjuster configured to adjust the clamping frequency of the switch in accordance with the one or more detected parameter values in order to maintain the “time-on” property of the switch above a minimum threshold value. | 12-29-2011 |
20120008350 | METHOD OF CONTROLLING A PFC STAGE OPERATING IN BOUNDARY CONDUCTION MODE, A PFC STAGE, AND AN SMPS - For many applications an SMPS is designed to operate in boundary conduction mode. As the load decreases the switching frequency increases, and so the concept of valley skipping may be used in which the switching frequency is clamped, by delaying to turn on the time of the active switch, for an integral number of cycles of a resonant circuit in the SMPS. With further reduction of the load, additional valleys may be skipped. However, each change in the number of valleys skipped results in a step in the input current that is drawn, distorting the ideal mains sine wave, thereby increasing unwanted harmonics. | 01-12-2012 |
20120105135 | INTEGRATED CIRCUIT CAPACITOR - An electrical circuit for emulating a capacitance, comprises a physical capacitor which is charged by charge flow from the input of the electrical circuit. An amplifier amplifies the voltage at the input of the electrical circuit such that the physical capacitor is charged with a larger change in voltage than the change in voltage at the input. This implements an effective multiplication of capacitance. A reset system resets the physical capacitor without drawing charge from the input of the electrical circuit. This extends the voltages which can be provided to the input. | 05-03-2012 |
20120127761 | CIRCUIT FOR A RESONANT CONVERTER - A circuit ( | 05-24-2012 |
20120163039 | CONTROLLER FOR A RESONANT CONVERTER - A controller for a resonant converter, wherein the controller is configured to operate the resonant converter in a high power mode of operation by adjusting a first control parameter to vary the output power and a low power mode of operation by adjusting a second control parameter to vary the output power. The controller is configured to set the value of the first control parameter when changing between the high power mode of operation and the low power mode of operation such that the output power is substantially consistent during the changeover. | 06-28-2012 |
20120300517 | POWER FACTOR CORRECTOR WITH HIGH POWER FACTOR AT LOW LOAD OR HIGH MAINS VOLTAGE CONDITIONS - A power factor corrector raises power factor at low loads or high mains voltages by modifying the switch timing or the current received by the power converter. It achieves this by increasing the switch-on time of a control switch during the falling time so that the majority of the switch-on time during a mains period occurs during the falling time, to thereby control the current received by the converter to compensate for current received by the intermediate filter. Some embodiments may employ a feedback system to produce one or more error signals that modify the control signal used to control the operation of the converter. Various embodiments may also include additional stages that limit the compensation range of the error signal. | 11-29-2012 |
20130016533 | RESONANT CONVERTER CONTROLAANM Halberstadt; HansAACI GroesbeekAACO NLAAGP Halberstadt; Hans Groesbeek NL - Consistent with an example embodiment there is a method of controlling a resonant power converter; the power converter includes first and second series connected switches connected between a supply voltage line and a ground line and a resonance circuit, having a capacitor and an inductor. The resonance circuit is connected to a node connecting the first and second switches. The method comprises repeated sequential steps of closing the first switch to start a conduction interval; sampling a voltage across the capacitor to obtain a sampled voltage level; and opening the first switch to end the conduction interval when a voltage across the capacitor crosses a voltage level determined by addition of the sampled voltage level with a predetermined voltage difference; wherein controlling the predetermined voltage difference determines a power output of the resonant power converter. | 01-17-2013 |
20130077354 | Controller for a Switched Mode Power Supply - A controller ( | 03-28-2013 |
20130100711 | Switching Circuit - A switching circuit ( | 04-25-2013 |
20130300464 | METHOD OF CONTROLLING A SWITCHED MODE POWER SUPPLY AND CONTROLLER THEREFOR - A controller for an SMPS is disclosed. The controller applies a frequency jitter to the SMPS to reduce Electromagnetic Interference (EMI) and/or audible noise. A second input variable is multiplied by a correlated jitter signal, in order to compensate the output power for the frequency jitter. A corresponding method is also disclosed. Since the jitter compensation occurs within the controller, the method is particularly suitable for controllers operating under different control modes for different output powers (or other output criteria). The multiplicative compensation is applicable across a wide range of converter types. | 11-14-2013 |
20140016373 | CONTROL CIRCUIT FOR A SWITCHED-MODE POWER SUPPLY - A control circuit for a switched-mode power supply having an input side ( | 01-16-2014 |
20140071719 | NOISE FILTERING - A noise filter circuit uses open loop signal processing to process the signal that causes the noise and generate a signal to be fed back into the system to cancel noise currents. | 03-13-2014 |
20140098578 | SWITCHED MODE POWER SUPPLIES - An example embodiment relates to a switched-mode power supply comprising a transformer with a first winding and a second winding. There is a transmitter configured to: detect a detectable variable (Vout) at the first winding, generate a transformer relayed signal in accordance with the detectable variable (Vout), and provide the transformer relayed signal to the first winding. A receiver is configured to: receive the transformer relayed signal from the second winding, and control a controllable variable at the second winding in response to the transformer relayed signal, wherein the transformer relayed signal is a symbol stream comprising a plurality of symbols. | 04-10-2014 |
20140210370 | RESONANT CONVERTER CONTROL - The invention relates to methods of controlling operation of a resonant power converter and to controllers configured to operate according to such methods. Embodiments disclosed include a method of controlling a power output of a resonant power converter comprising first and second switches (S | 07-31-2014 |