Signify Holding B.v.

Koninklijke Philips Corporation N.v.

Zadok Vitalis Socrates Kroeze

Tijmen Cornelis Van Bodegraven

Roelf Van Der Wal

Adam Kurasz

The invention relates to a circuit for providing isolated data transfer. The circuit comprises a sensor adapted to be coupled to a conversion circuit, the conversion circuit, which is adapted to use a signal generated by the sensor and an offset voltage to generate in a time sequential manner, a first voltage level and a second voltage level, wherein the second voltage level is larger than the first voltage level. The circuit comprises a voltage to current transformer circuit adapted to convert the first voltage level into a first current level within a current range and the second voltage level into a second current level within the current range, wherein the first current level and the second current level are time sequentially provided to an optocoupler. The optocoupler is adapted to receive time sequentially the first current level and the second current level and to provide an isolated output voltage having a first voltage when the first current level is provided to the optocoupler and a second voltage when the second current level is provided to the optocoupler, an analog to digital converter adapted to receive the isolated output voltage and adapted to provide a digital output voltage and a controller coupled to the analog to digital converter, wherein the controller is adapted to derive the signal generated by the sensor from the digital output voltage corresponding to the isolated output voltage received in the time sequential manner.

Overvoltage protection integrated in the module temperature protection

An isolated driver generates a PWM load drive level signal at the primary side and provides this to the secondary side via an optocoupler. Power consumption of the load is also sensed at the primary side. A drive level is sensed at the secondary side and compared at the secondary side with the load drive level to provide an error signal for the primary side controller. A frequency of the PWM load drive level signal is adjusted and the power consumption of the load is monitored in response to the frequency adjustment. The duty cycle of the PWM load drive level signal can then be adapted to compensate for errors introduced by the optocoupler.

Driver circuit and a method of controlling a driver

A drive circuit () for driving a load () comprises: a power supply () for supplying an output current (I); a controller () for controlling the power supply; a current sensor () for generating a current sense signal (V); a controllable switch () in series with the output (), the switch being controlled by a mode controller (); wherein the mode controller in a reduced brightness mode generates its switch control signal (S) for the switch for alternatively opening and closing the switch. At the end of a current pulse, an average current value averaged over the pulse duration is calculated, compared with a reference value (V), and, if said average value is larger than the reference value, a duration for the next pulse pause is calculated such that an average value averaged over the entire pulse period is equal to the reference value.

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Oss, Netherlands

Zadok Vitalis Socrates Kroeze