Dialog Semiconductor (uk) Limited

Apple Inc.

Dialog Semiconductor Gmbh

Andrea Acquas

Michael Couleur

Alessandro Angeli

Jiri Ledr

Fulvio Schiappelli

Nicola Rasera

Kemal Ozanoglu

Pier Cavallini

Nikola Jovanovic

Christian Wolf

Selcuk Talay

Stanly Jacob

Dieter Graefje

Marcelo DePaula Campos

Marcelo De Paula Campos

A power converter circuit included in a computer system may charge and discharge a switch node coupled to a regulated power supply node via an inductor. The power converter circuit may generate a reference clock signal using a system clock signal and a voltage level of the switch node. The reference clock signal may be used to initiate a charge cycle, whose duration may be based on generated ramp signals.

Power converter with phase error correction

A power converter circuit included in a computer system may charge and discharge a switch node coupled to a regulated power supply node via an inductor. During a charge cycle, the power converter circuit may generate a reference ramp signal that has an initial voltage level greater than that of the switch node. The power converter may also generate a sense ramp signal using the voltage level of the switch node, and halt the charge cycle using results of a comparison of the respective voltage levels of the reference ramp signal and the sense ramp signal.

Power converter with on-resistance compensation

This application relates to a lighting system comprising a plurality of light emitting diode, LED, circuits, and a power source for providing a drive voltage to the plurality of LED circuits. For each LED circuit, the lighting system comprises a first variable resistance element connected between the respective LED circuit and ground, and a first feedback circuit configured to control a voltage at a first node between the respective LED circuit and the respective first variable resistance element to a first voltage. The lighting system further comprises a current source and a second variable resistance element connected between the current source and ground, wherein each first variable resistance element is configured to attain a resistance value depending on a resistance value attained by the second variable resistance element.

Low-overhead current generator for lighting circuits

A current mode control buck-boost converter with improved performance utilizes separate buck and boost pulses. The buck-boost converter utilizes a buck/boost decision method with continuous control voltage for buck and boost mode, therefore eliminating transients in the control loop between operation modes and preventing voltage overshoots. If switching in Boost mode and the buck duty cycle is smaller than a set duty cycle, then in the next cycle Buck mode switching will occur. It is possible to track a Buck comparator output and the related duty cycle during Boost mode operation. Thus a mode change decision will only be dependent on a single input. A control loop will incorporate a single loop filter and error amplifier, wherein control voltages for Buck comparator and Boost comparator will be related.

Method for a current mode buck-boost converter

This invention relates to control circuits for LED systems with a feedback loop to regulate a drive voltage. A controller for the system is proposed comprising a plurality of LED circuits and a controllable power source. The controller comprises a control unit configured to cause regulation of the drive voltage based on a determination of a plurality of feedback voltages and a fault condition detecting means. At least one of the LED circuits is determined as having a fault condition if the respective feedback voltage is below a fault threshold. In response to a detected fault condition, a test voltage is applied to a cathode of the fault circuit to confirm the presence of a fault condition.

Short circuit detection for lighting circuits

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Munich, Germany

Andrea Acquas