Nxp B.v.

Koninklijke Philips Corporation N.v.

U.S. Philips Corporation

Koninklijke Phillips Electronics N.v.

Thomas Duerbaum

Frans Pansier

Hans Halberstadt

Markus Schmid

Johann Baptist Daniel Kuebrich

Reinhold Elferich

Gian Hoogzaad

Georg Sauerlaender

Juergen Stahl

Jens Goettle

Alexander Pawellek

Anton Cornelis Blom

Tobias Georg Tolle

Peter Luerkens

Pieter Jan Mark Smidt

Peter Laro

Matthias Wendt

Hubert C Raets

Carsten Deppe

Christoph Loef

Heinz Willi Van Der Broeck

Klaus Mühlbauer

Hendrikus Johannes Jacobus Domensino

Johann Kuebrich

Juergen Halfmann

A noise detection circuitfor a power supply, the noise detection circuitcomprising: an impedance elementconnected to a linefor carrying a power supply current having a noise signal component, the noise signal comprising a common mode noise signal and a differential mode noise signal; a filter elementcoupled to the impedance elementand configured to suppress the differential mode noise signal in the noise detection circuit; and an evaluation circuitcoupled to the impedance elementor the filter elementand arranged to sense the common mode noise signal and provide an output representative of the common mode noise signal.

Noise detection circuit

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.

Noise filtering

A common mode noise sensor with a single amplification path is disclosed. The common mode noise sensor includes first and second terminals for receiving respective first and second signals from a power supply, an amplifier stage connected to the first and second terminals and having an output and a resistor network connected to the amplifier stage. The resistor network is arranged such that the output of the amplifier stage is configured to provide an output signal in which a differential mode noise in the first and second signals is suppressed in preference to a common mode noise in the first and second signals.

Noise sensor

The present invention relates to a noise sensor for an alternating or direct current power supply. The sensor comprises a noise sensing unit and a noise separator. The noise separator is configured to receive first, second and third input signals and provide a first output signal representative of the common mode noise and a second output signal representative of the differential mode noise. The noise sensing unit comprises a first capacitive element, a second capacitive element, a first resistive element and a second resistive element.

A method is disclosed of controlling a switched mode converter comprising a switch and for providing power to device having a load, comprising: in response to the load exceeding a first threshold, operating in a first mode, being a CCM; in response to the load exceeding a second threshold and not exceeding the first threshold, operating in second mode, being a BCM without valley skipping wherein the switching frequency increases with decreasing load; in response to the load exceeding a third threshold and not exceeding the second threshold, operating in a third mode, being a BCM with valley skipping, wherein the switching frequency depends on the load and the number of valleys skipped and is between a fixed upper and a lower switching frequency limit; and in response to the load not exceeding the third threshold, operating in a fourth mode, being a BCM with valley skipping, wherein the switching frequency depends on at least the load, and is between an upper and a lower switching frequency limit wherein the upper switching frequency limit decreases with decreasing load. A switched mode converter controlled by such a method is also disclosed.

Switched mode converter and methods of controlling switched mode converters

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, S) connected in series between a pair of supply voltage lines, a resonant circuit connected to a node between the first and second switches and to an output connectable to an output electrical load, the resonant circuit comprising an inductor and a capacitor, the method comprising: closing the first switch (S) to start a first conduction interval; setting a first voltage level (); setting a first time period; and opening the first switch (S) to end the first conduction interval when a voltage () across the capacitor crosses the first voltage level () and when a time period from closing the first switch exceeds the first time period ().

Resonant converter control

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.

Surge protection 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.

Boundary conduction mode controller for a power conversion circuit

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.

Power supply unit and method for controlling a power supply unit

A power factor correction stage comprising: an input terminal configured to receive an input signal; an output terminal configured to provide an output signal; a first converter stage and one or more further converter stages, wherein each of the converter stages is connected to the input terminal and the output terminal, and each converter stage comprises a switch; and a controller configured to operate the switches of the converter stages. The controller is configured to operate the switch of the one or more further converter stages at a period of time after operation of the switch of the first converter stage for a current switching cycle, wherein the period of time corresponds to a proportion of the switching frequency for an earlier switching cycle that does not correspond to substantially the period of the earlier switching cycle divided by the number of converter stages.

Power factor correction stage with an adjustable delay time

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. The active filtering may be based on determination of the peaks (positive and/or negative) of the signal, either directly, including a quarter period offset, or including decay&#x2014;or a combination of the above; alternatively, the active filtering may be based on the a smoothing functions such as a switched low-pass filter or a short time integrator.

Methods of controlling a synchronous rectifier

Consistent with an example embodiment, there is a control method which reduces the steps: instead of a constant on-time for the switch, the duration of the on-time is increased each time an additional valley to be skipped. The predetermined increase may be either a fixed fractional increase or a further additional increment; it may be determined by a small regulation loop that multiplies the on-time from the main loop with a factor equal to the ratio between measured period time and the sum of primary and secondary stroke times.

Method of controlling a PFC stage operating in boundary conduction mode, a PFC stage, and an SMPS

Consistent with an example embodiment, a circuit comprises a power factor correction stage having a DC input, a ground input, a DC output and a ground output. The circuit further includes a capacitor; a diode; and a discharge circuit. 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 circuit 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.

Power factor correction (PFC) circuit and method therefor

The invention relates to a resonant converter () which has multiple outputs () and contains a transformer () with a primary winding () and at least two secondary windings () having different winding directions. In this way it is possible to design as cost-effectively as possible a resonant converter with multiple outputs, two of which can be controlled separately from each other.

Resonant converter

A power supply module arrangement with an integrated circuit mounted on a bearing unit and a power supply includes an integrated circuit mounted on a bearing unit and a power supply module arrangement that is placed on the combination of bearing unit and integrated circuit. The power supply module arrangement includes a base extending at least partially over the base of the integrated circuit and/or all around the base of the integrated circuit. The power supply module arrangement allows for greater permissible load jumps, greater permissible current change rates and ever tighter tolerances regarding the constancy of the supply voltage.

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Baiersdorf, Germany

Thomas Duerbaum