Hewlett-packard Development Company, L.p.

Silanna Asia Pte Ltd

Kais Badami

Rawinder Dharmalinggam

Kok Soon Yeo

James Kristian Koch

During a first mode of operation, a zero current detect (ZCD) signal is asserted in response to detecting a zero current condition at a switch node of a power converter. The power converter enters a light load mode of operation when the ZCD signal is asserted between a beginning point and a trigger point of a period of a PWM signal. A compensator voltage is generated based on a feedback voltage indicative of an output voltage. The compensator voltage is compared to a threshold voltage that represents a limit for the compensator voltage during the light load mode of operation determined over a range of the output voltage. The power converter exits the light load mode back to the first mode of operation in response to the compensator voltage being beyond the threshold voltage.

Light load mode entry or exit for power converter

A sensing device is provided. The sensing device includes two or more sensors for sensing one or more physical properties. A first sensor draws a first electrical signal, and similarly, a second sensor draws a second electrical signal. The first and second electrical signals correspond to values of the physical properties sensed by the respective first and second sensors. The sensing device further includes an electrical circuit connected to the first and second sensors. The electrical circuit draws a third electrical signal. The electrical circuit is configured such that the total electrical signal drawn by the sensing device is proportional to either the first or the second electrical signal, whichever has a higher value.

Sensing device

In an embodiment of the present invention there is provided a device for providing a control voltage that is substantially equivalent to a reference voltage used by a power supply. The device includes a first electronic circuit that is arranged to be connected to a ground via a resistor and to produce a supplementary voltage that is dependant on a resistance of the resistor. The device also includes a second electronic circuit that is arranged to present a resistance to a current in order to provide the control voltage and to receive an output voltage of the power supply and the supplementary voltage to effect the current.

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Singapore, Singapore

Kais Badami