Patent application number | Description | Published |
20080224641 | Driver for a Brushless Motor and Data Reading/Writing Device Comprising a Brushless Motor Controlled by Such a Driver - A driver for a brushless motor ( | 09-18-2008 |
20090045764 | Driver For an Inductive Load | 02-19-2009 |
20090284193 | Method for Controlling a Deceleration Process of a DC Motor and Controller - The invention is directed to a method for controlling a deceleration process of a DC motor ( | 11-19-2009 |
20090310269 | ARRANGEMENT AND METHOD FOR DEACTIVATING ELECTRICAL ELEMENTS WHEN MALFUNCTIONING - Arrangements ( | 12-17-2009 |
20090315490 | METHOD FOR CONTROLLING A DECELERATION PROCESS OF A DC MOTOR AND CONTROLLER - The invention is directed to a method for controlling a deceleration process of a DC motor ( | 12-24-2009 |
20100019681 | ELECTRONIC DEVICE FOR DRIVING LED STRINGS - The present invention relates to an electronic device for driving at least a first channel (CHA) and a second channel (CHB) of light emitting diodes (LED). The electronic device includes driving means having a first and a second driving portion for driving the first and the second channel (CHA, CHB) of light emitting diodes separately, and configuration | 01-28-2010 |
20100019693 | CONTROLLED VOLTAGE SOURCE FOR LED DRIVERS - The present invention relates to an electronic device for driving a light emitting semiconductor device, which includes controlling means (CNTL) being adapted for controlling a switch mode power supply for supplying the light emitting semiconductor device in response to a sensing value received by the controlling means which is indicative of a voltage across a current source for determining a current through the light emitting semiconductor device, wherein the switch-mode power supply is controlled such that the voltage across the current source is minimum. | 01-28-2010 |
20100052569 | ELECTRONIC DEVICE FOR DRIVING LIGHT EMITTING DIODES - The present invention relates to an electronic device for driving a light emitting diode, which includes a switch (Ts) being adapted to switch a switch-mode power converter, and controlling means (CNTL) being adapted for controlling the switch (Ts) in response to a sensing value (Vs) indicative of a current of the switch-mode power converter and for controlling by the switch (Ts) the output voltage of the switched power converter and a current (Iout) through the light emitting diode. | 03-04-2010 |
20100181923 | SELF-POWERED LED BYPASS-SWITCH CONFIGURATION - A LED string is divided into segments that each have a bypass-switch and a driver for the bypass-switch. The driver is powered by a supply voltage locally generated from the forward-voltages of the LEDs of the segment. | 07-22-2010 |
20100181947 | DRIVER FOR A BRUSHLESS MOTOR, SYSTEM COMPRISING A DRIVER AND A BRUSHLESS MOTOR AND A METHOD FOR DRIVING A MOTOR - A driver (DR) for a brushless motor comprises at least three outputs (O | 07-22-2010 |
20100194274 | LIGHT EMITTING DIODE (LED) ARRANGEMENT WITH BYPASS DRIVING - The invention provides a LED arrangement including a LED string of a series arrangement of LED segments. A LED segment includes a single LED or a series arrangement of LEDs. A switching element ( | 08-05-2010 |
20100315016 | METHOD AND CIRCUIT ARRANGEMENT FOR REGULATING A LED CURRENT FLOWING THROUGH A LED CIRCUIT ARRANGEMENT, AND ASSOCIATED CIRCUIT COMPOSITION AND LIGHTING SYSTEM - The invention provides a method for regulating a LED current (ILED) flowing through a LED circuit arrangement at a mean LED current level. The method includes establishing an oscillating converter current(IL), establishing a first and a second current control indicator representative of a flow of a converter current (IL); regulating a peak and valley current level of the converter current in dependence on the first current control indicator; controlling a converter current period (T) of an oscillation of the converter current in dependence on the second current control indicator to be within a period control range (Tref) and feeding at least part of the converter current to the LED circuit arrangement. The invention also provides a circuit arrangement for regulating a LED current using the method, a LED driver IC using the circuit arrangement, a circuit composition with at least one LED and the circuit arrangement, and a lighting system with the circuit composition. | 12-16-2010 |
20100315019 | LED DRIVER CIRCUIT AND METHOD, AND SYSTEM AND METHOD FOR ESTIMATING THE JUNCTION TEMPERATURE OF A LIGHT EMITTING DIODE - A driver circuit ( | 12-16-2010 |
20110031816 | PHOTOVOLTAIC UNIT, A DC-DC CONVERTER THEREFOR, AND A METHOD OF OPERATING THE SAME - A photovoltaic unit is disclosed comprising a plurality of sub-units connected in series, each sub-unit having a main input and a main output, which main output is connected to the respective main input of a neighbouring sub-unit, each sub-unit further comprising a segment comprising one or more series-connected solar cells, and a supplementary power unit, wherein the supplementary power unit is configured to at least one of receive power from or supply power to the neighbouring sub-unit. The supplementary power unit is preferably a DC-DC converter, and arranged to exchange energy between neighbouring segments, without requiring a high-voltage connection across the complete string (of more than 2 segments). The converter may be inductive or capacitive. | 02-10-2011 |
20110062889 | SOLID STATE LIGHTING SYSTEM AND A DRIVER INTEGRATED CIRCUIT FOR DRIVING LIGHT EMITTING SEMICONDUCTOR DEVICES - The present invention relates to a solid state lighting system comprising at least one light emitting semiconductor device (LEDstr), at least one driving means (LEDdr) for driving a predetermined current through the at least one light emitting semiconductor device (LEDstr). The lighting system furthermore comprises a first voltage supplying unit (PS | 03-17-2011 |
20110068713 | METHOD AND CIRCUIT ARRANGEMENT FOR CYCLE-BY-CYCLE CONTROL OF A LED CURRENT FLOWING THROUGH A LED CIRCUIT ARRANGEMENT, AND ASSOCIATED CIRCUIT COMPOSITION AND LIGHTING SYSTEM - The invention provides a method for cycle-by-cycle control of a LED current (ILED) flowing through a LED circuit arrangement (LEDCIRC) at a mean LED current level. The method comprises a) establishing a converter current (IL), b) establishing an oscillation of the converter current (IL) between substantially a valley current level and substantially a peak current level, c) feeding the LED circuit arrangement (LEDCIRC) with the converter current (IL) as the LED current during a part of an oscillation cycle of the oscillation of the converter current, d) determining a current level correction for compensating a current level error between an integral over an oscillation cycle of the LED current and a reference, the reference being representative of the mean LED current level, and e) adjusting at least one of the valley current level and the peak current level with the current level correction for use in a successive cycle of the oscillation of the converter current. The invention also provides a circuit arrangement operable for using the method, a LED driver IC using the circuit arrangement, a circuit composition with at least one LED and the circuit arrangement, and a lighting system with the circuit composition. | 03-24-2011 |
20110109247 | SWITCHED MODE POWER CONVERTER AND METHOD OF OPERATING THE SAME - A switched mode power converter is disclosed, together with a method for operating the same. The power converter is adapted to be operable in the boundary conduction mode, and operation is interruptible in the absence of any load requirement. | 05-12-2011 |
20110163695 | POWER SUPPLY UNIT AND METHOD FOR CONTROLLING A POWER SUPPLY UNIT - A power supply unit is provided which comprises an AC/DC conversion unit with an input to which an input voltage is coupled and an output to which a DC bus voltage is coupled. The power supply unit furthermore comprises a DC bus capacitor which is coupled to the output of the AC/DC conversion unit. The power supply unit furthermore comprises at least one sub-power supply unit receiving the DC bus voltage as input for providing at least one power supply. The power supply of the at least one sub-power supply unit or part of the load is at least reduced or switched off if the input voltage falls below a predetermined threshold value. | 07-07-2011 |
20110164339 | SURGE PROTECTION CIRCUIT - A surge protection circuit for a circuit having a rectification module. The surge protection circuit includes a first diode, a second diode, a capacitor and a discharge device. The anode of the first diode is connected to a first input of the rectification module, and the anode of the second diode is connected to a second input of the rectification module. The cathodes of the first and second diodes are both connected to the first plate of the capacitor. The second plate of the capacitor is connected to the negative output of the rectification module. The capacitor is configured such that it is consistently charged to substantially the peak value of a supply voltage during normal operation between surge events. The discharge device is connected to the first plate of the capacitor and is configured to discharge the capacitor when the voltage across the capacitor is in excess of the peak of the maximum value of the normal supply voltage and not discharge the capacitor when the voltage across the capacitor is not in excess of the peak of the maximum value of the normal supply voltage. | 07-07-2011 |
20110188270 | CIRCUIT - A circuit comprising a power factor correction stage having a DC input, a ground input, a DC output and a ground output; a capacitor; a diode; and discharge means. A first terminal of the diode is connected to an input of the power factor correction stage, a second terminal of the diode is connected to the first plate of the capacitor; and the second plate of the capacitor is connected to the other input of the PFC stage. The discharge means is connected to the capacitor and is configured to discharge the capacitor such that it contributes to the output of the PFC stage when the level of a signal at the input of the PFC stage falls below a threshold value. | 08-04-2011 |
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 |
20110215784 | CONTROLLER FOR, AND METHOD OF CONTROLLING, A SWITCHED MODE POWER CONVERTER - A method is disclosed for controlling a DC-DC switched-mode power converter comprising a switch, the method comprising, whilst controlling the switch by a main control loop: detecting a step in a load on the switched-mode power converter; generating a signal in response to the detector detecting a step in the load, and switching the switch in response to the signal. Advantageously, the method may avoid a delay (such as waiting for a subsequent oscillator pulse) which might otherwise occur before switching the switch, to react to the transient. The faster response may result in a reduction of the transient current from the converter, which may facilitate the use of smaller and cheaper components. | 09-08-2011 |
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 |
20120001570 | METHOD OF CONTROLLING AN LED, AND AN LED CONTROLLER - A method is disclosed of controlling a LED, comprising driving the LED with a DC current for a first time, interrupting the DC current for a second time such that the first time and the second time sum to a period, determining at least one characteristic of the LED whilst the DC current is interrupted, and controlling the DC current during a subsequent period in dependence on the at least one characteristic. The invention thus benefits from the simplicity of DC operation. By operating at the LED in a DC mode, rather than say in a PWM mode, the requirement to be able to adjust the duty cycle is avoided. By including interruptions to the DC current, it is possible to utilise the LED itself to act as a sensor in order to determine a characteristic of the LED. The need for additional sensors is thereby avoided. | 01-05-2012 |
20120098344 | PHOTOVOLTAIC UNITS, METHODS OF OPERATING PHOTOVOLTAIC UNITS AND CONTROLLERS THEREFOR - The present invention relates to the field of photovoltaic systems with solar cell (s) or modules having insolation differences or mismatch. Each solar module is formed by placing a large number of solar cells in series. The PV system is then formed by placing a number of solar modules in series in a string and sometimes by placing multiple strings of series-connected solar modules in parallel, depending on the desired output voltage and power range of the PV system. In practical cases, differences will exist between output powers of the solar cells in the various modules, e.g. due to (part of) the modules being temporarily shaded, pollution on one or more solar cells, or even spread in solar-cell behaviour that may become worse during aging. Due to the current-source-type behaviour of solar cells and their series connection these differences will lead to a relatively large drop in output power coming from the PV system. This invention addresses this problem by adding DC-DC converters ( | 04-26-2012 |
20120206205 | VARIABLE GAIN AMPLIFIER - The invention relates to a variable gain amplifier comprising a first attenuator ( | 08-16-2012 |
20120262235 | DIFFERENTIAL OUTPUT STAGE - A differential output stage configured for receiving differential input signal comprising first and second signals, comprising a first output for providing a first output signal, and a second output providing a second output signal, the first and second output signals together forming a differential output signal, a first voltage buffer and first controlled current source each connected to the first output, the first voltage buffer being driven by a signal in-phase with the first input signal, the first controlled current source being driven by a signal in-phase with the second input signal, and a second voltage buffer and second controlled current source each connected to the second output, the second voltage buffer being driven by a signal in-phase with the second input signal, the second controlled current source being driven a signal in-phase with by the first input signal. | 10-18-2012 |
20130154494 | ELECTRONIC DEVICE FOR DRIVING LIGHT EMITTING DIODES - The present invention relates to an electronic device for driving a light emitting diode, which includes a switch (Ts) being adapted to switch a switch-mode power converter, and controlling means (CNTL) being adapted for controlling the switch (Ts) in response to a sensing value (Vs) indicative of a current of the switch-mode power converter and for controlling by the switch (Ts) the output voltage of the switched power converter and a current (Tout) through the light emitting diode. | 06-20-2013 |
20130175929 | METHOD AND CIRCUIT ARRANGEMENT FOR REGULATING A LED CURRENT FLOWING THROUGH A LED CIRCUIT ARRANGEMENT, AND ASSOCIATED CIRCUIT COMPOSITION AND LIGHTING SYSTEM - Consistent with an example embodiment there is a method for regulating a LED current (ILED) flowing through a LED circuit arrangement at a mean LED current level. The method includes establishing an oscillating converter current (IL), establishing a first and a second current control indicator representative of a flow of a converter current (IL); regulating a peak and valley current level of the converter current in dependence on the first current control indicator; controlling a converter current period (T) of an oscillation of the converter current in dependence on the second current control indicator to be within a period control range (Tref) and feeding at least part of the converter current to the LED circuit arrangement. | 07-11-2013 |
20130334977 | SWITCHED MODE POWER CONVERTER AND METHOD OF OPERATING THE SAME - A switched mode power converter is disclosed, together with a method for operating the same. The power converter is adapted to be operable in the boundary conduction mode, and operation is interruptible in the absence of any load requirement. | 12-19-2013 |
20140333224 | SWITCHED MODE POWER CONVERTER AND METHOD OF OPERATING THE SAME - A switched mode power converter is disclosed, together with a method for operating the same. The power converter is adapted to be operable in the boundary conduction mode, and operation is interruptible in the absence of any load requirement. | 11-13-2014 |
20150015155 | ELECTRONIC DEVICE FOR DRIVING LIGHT EMITTING DIODES - The present invention relates to an electronic device for driving a light emitting diode, which includes a switch (Ts) being adapted to switch a switch-mode power converter, and controlling means (CNTL) being adapted for controlling the switch (Ts) in response to a sensing value (Vs) indicative of a current of the switch-mode power converter and for controlling by the switch (Ts) the output voltage of the switched power converter and a current (Tout) through the light emitting diode. | 01-15-2015 |