Driver device and driving method for driving a load, in particular a light unit

摘要

The present invention relates to a driver device (10) for driving a load (14), in particular a light unit (14) having one or more light emitters, comprising input terminals for receiving an input voltage (V10) from an external power source (12), output terminals for providing electrical power to the load for powering the load (14), a driver stage (16) connected to the input terminals and to the output terminals, wherein the driver stage (16) is adapted to control an input current (I1) drawn from the external power supply (12) and to control the electrical power provided to the output terminal shaving a predefined level, a detection device (24) for measuring at least one electrical parameter (V10, V12, I2, V20) of the driver stage (16) and for determining an input voltage deviation from predefined supply conditions on the basis of the electrical parameter (V10, V12, I2, V20), wherein the driver stage (16) is adapted to control the input current (I1) according to predefined conditions if the input voltage deviation is lower than a threshold level (63) and to allow a deviation of the input current (I1) from the predefined conditions if the input voltage deviation exceeds the threshold level (63).

主权项

1. Driver device for driving a load comprising a light unit having one or more light emitters, comprising:
input terminals for receiving an input voltage from an external power source, output terminals for providing electrical power to the load for powering the load, a driver stage connected to the input terminals and to the output terminals, wherein the driver stage is configured to control an input current drawn from the external power supply and to control the electrical power provided to the output terminals having a predefined level, a control stage connected to the driver stage for controlling the driver stage, a normal control loop electrically coupled to the external power source, the load, and the driver stage for receiving the input voltage and providing a first control command to the control stage, a backup control loop electrically coupled to the external power source, the load, and the driver stage for receiving the input voltage and providing a second control command to the control stage, a detection device configured to measure at least one electrical signal parameter of the driver stage and to determine an input voltage deviation from predefined supply conditions on the basis of the electrical signal parameter, wherein the control stage is configured to control the driver stage on the basis of the first control command, if the input voltage deviation is lower than the threshold level and on the basis of the second control command or both the first and the second control commands, if the input voltage deviation exceeds the threshold level, and wherein the driver stage is configured to control the input current according to predefined conditions if the input voltage deviation is lower than a threshold level and to allow a deviation of the input current from the predefined conditions if the input voltage deviation exceeds the threshold level.