Nxp B.v.

Juergen Stahl

Hans Halberstadt

Thomas Duerbaum

Frans Pansier

Alexander Pawellek

Jens Goettle

Anton Cornelis Blom

Markus Schmid

Johann Kuebrich

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.

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 ().

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Herrieden, Germany

Juergen Stahl