Nxp B.v.

Frans Pansier

Thomas Duerbaum

Hans Halberstadt

Gian Hoogzaad

Markus Schmid

Johann Baptist Daniel Kuebrich

Jens Goettle

Alexander Pawellek

Juergen Stahl

Anton Cornelis Blom

Cheng Zhang

Peter Laro

Peter Theodorus Johannes Degen

Wilhelmus H M Langeslag

Klaus Mühlbauer

Alfred Grakist

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 power factor controller is disclosed, in which error feedback is provided my means of a parallel combination of at least two error feedback channels. By providing at least two error feedback channels, the stability associated with, for instance, a continuously integrated feedback loop with relatively long time constant, may be combined with a fast transient response associated with, for instance, a sample-and-hold error feedback. A method of operating such a power factor controller is also disclosed.

Power factor controller with error feedback, and a method of operating such a power factor controller

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 disclosure relates to a voltage generator for providing an output voltage in accordance with a received target signal, the voltage generator comprising: a resonant converter configured to receive an input voltage, the resonant converter comprising: a first switch; a second switch connected in series with the first switch between the input voltage and ground (GND); a resonant tank associated with the second switch; an output capacitor coupled to the resonant tank and configured to provide an output voltage; and a rectifier configured to allow charge to flow in a single direction between the resonant tank and the output capacitor; and a controller configured to receive the target signal and to set an operating parameter of the resonant converter in accordance with a difference between an output value which is related to the output voltage and the target signal.

Voltage generator

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 provides a cascode transistor circuit with a main power transistor and a cascode MOSFET formed as an integrated circuit, packaged to form the cascode transistor circuit. A control and protection circuit is integrated into the integrated circuit together and a storage capacitor provides an energy source to drive the control and protection circuit. A charging circuit is also integrated into the integrated circuit for charging the storage capacitor.

Cascoded semiconductor devices

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.

Electronic device for driving light emitting diodes

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

This invention relates to improved methods of preventing MOSFET damage in a resonant switched mode power converter () by preventing or limiting capacitive mode operation. A combination of response actions (respectively delaying MOSFET switch-on, adjusting switching phase, forcing a switch-on, and increasing frequency) is utilized. In the preferred embodiment, the voltage slope at the half-bridge node () is monitored, and in alternative embodiments the same or similar set of response actions is triggered by monitoring different signals, including: the resonant current polarity at switch-off or after the non-overlap time; the voltage of the to-be-switched-on' switch; and the voltage of the 'just-switched-off' switch.

Control of a half resonant converter for avoiding capacitive mode

A method and controller for power dependant mains under-voltage ('brown-out') protection is disclosed. Brown-out protection is meant for protection against overheating due to low mains voltage and associated high mains current. The disclosed method and controller allow for lower mains voltages at low load by comparing the mains voltage with a signal indicating the actual power level of the power supply. In converters such as flyback converters, this brown-out protection can be implemented by comparing the actual peak voltage of the mains voltage with a control signal that indicates the power level. In other embodiments, the mains voltage is compared to a preset level by means of a comparator. Provided the voltage passes the preset level prior to opening the control window, the SMPS functions normally. Conversely, brown-out protection is initiated if the voltage does not pass the preset level before the control window opens.

Power-dependent mains under-voltage protection

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 circuit () for a resonant converter (), the resonant converter configured to operate in a burst mode of operation, the circuit configured to:

Growing community of inventors

Nuenen, Netherlands

Frans Pansier