Danfoss Compressors Gmbh

Mads Andersen

Rune Thomsen

Claus Schmidt

Ole Schebel Bachmann

Henrik Joergensen

Niels Pedersen

A method and a control unit () for controlling a supply of power to an electrical circuit comprising a switch (). An output voltage of a first power source (), which is connected to the circuit, is measured and compared to a predefined threshold voltage. If the measured voltage is smaller than the threshold value it is determined that the switch () is in a closed state, and if the voltage is larger than the threshold value it is determined that the switch () is in an open state. The supply of power is controlled in accordance with the open/closed state of the switch (). Preferably, the electrical circuit is connected to a second power source () when the switch () is in a closed state. Power is conserved while it is ensured that sufficient power is available when needed. The invention is very suitable for supplying power to a lamp () positioned inside a refrigeration compartment (), especially when the system is battery powered.

Intelligent lighting supply

A method for starting a battery driven motor, wherein an input voltage is measured continuously. In case the input voltage becomes smaller than a predefined minimum voltage the attempt to start the motor is stopped and the maximum permitted current level to be supplied from the battery to an electronic unit of the motor is lowered before the next attempt. This is repeated until the input voltage is larger than the minimum voltage and the motor is no longer in start-up mode. The method protects the battery from collapsing. The method is suitable for starting battery driven motors for driving compressors. The number of attempted start-up sequences may be counted and on the basis of this it may be determined that the battery is weak or that the wiring is misdimensioned. Furthermore, a control system for controlling starting of a motor.

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Odense Sv, Denmark

Mads Andersen