Ams Ag

Karl Georg Waser

Peter Trattler

Herbert Lenhard

Mario Teufel

A circuit arrangement for an optical monitoring system comprises a driver circuit which is configured to generate at least one driving signal for driving the light source. A detector terminal is arranged for receiving a detector current from an optical detector. A gain stage is connected at its input side to the driver circuit for receiving the driving signal and generates a noise signal depending on the driving signal. A processing unit is configured to generate an output signal depending on the detector current and the noise signal.

Circuit arrangement for an optical monitoring system and method for optical monitoring

A circuit arrangement () for driving light-emitting diodes comprises a number N of current regulators (), which each comprise a control input () and a load terminal () for providing a load current (IL, IL) to an electrical load () which can be coupled, in each case having a light-emitting diode ('). Furthermore, the circuit arrangement () comprises a compensation circuit (), which is coupled to the control inputs () of the number N of current regulators () and is designed to adjust the respective load current (IL, IL) in a load-dependent manner.

Circuit arrangement and method for operating light-emitting diodes

A driver arrangement comprises a current regulator (), to which at least one light-emitting diode () can be connected, and a driver circuit () that is coupled to the current regulator () and features a measurement input () for receiving a measurement signal (SM) that is dependent on the operation of the at least one light-emitting diode (). The driver circuit () is designed for adjusting the current level of the current regulator current (IS) of the current regulator () in dependence on the measurement signal (SM) such that a light quantity (SL) emitted by the at least one light emitting diode () has a constant brightness value.

Driver arrangement and method for driving at least one light-emitting diode

A flash driver to limit a load current for a flash comprises a dc/dc converter (DCDC) having a first input (IN) to receive an input voltage (Vin) and an output (OUT) to supply an output voltage (Vout). The dc/dc converter is designed to convert the input voltage (Vin) to the output voltage (Vout). Furthermore the flash driver has an adjustable current source (Iadj) connected between the output (OUT) and a load terminal (LT). A first control unit (CTRL) is connected to the first input (IN) and coupled to the adjustable current source (Iadj), and is designed to compare the input voltage (Vin) to a threshold (Vth) and, if the comparison indicates the input voltage (Vin) being smaller than the threshold value (Vth), adjust the adjustable current source (Iadj) such that the input voltage (Vin) is equal or greater than the threshold value (Vth). A second control unit (CTRL) is coupled to the adjustable current source (Iadj) and the dc/dc converter (DCDC) and is designed to detect a voltage drop over the adjustable current source (Iadj) and to set the dc/dc converter (DCDC) to control the conversion of input voltage (Vin) to the output voltage (Vout) depending on the detected voltage drop.

Flash driver to limit a load current of a flash and method to limit a load current of a flash driver

A voltage-converter arrangement comprises an arrangement input () for the supply of an input voltage (VIN), an arrangement output () for the provision of an output voltage (VOUT), a voltage converter () that is coupled on the input side to the arrangement input () and on the output side to the arrangement output (), and a control device () with a control output (). The control output () is coupled to the voltage converter (). A control signal (SW) can be picked up at the control output (). The control device () is designed to switch the frequency (f) of the control signal (SW) between values from a number N of predetermined, discrete frequency values. The voltage converter () is designed to convert the input voltage (VIN) into the output voltage (VOUT) as a function of the control signal (SW).

Voltage-converter arrangement and method for voltage conversion

A circuit arrangement for driving an electrical load comprises a connection node (LED) for connecting the electrical load and a control device (Ctrl) that is coupled to the connection node (LED) to drive the electrical load. A detection circuit (Det) is coupled to the connection node (LED) for detecting a trigger signal (trig) at the connection node (LED) and coupled to the control device (Ctrl) via a measurement channel (Mes).

Circuit arrangement and method for driving an electrical load

A circuit arrangement () for testing a reset circuit () comprises the reset circuit () and a changeover switch (). The reset circuit comprises a voltage input () for feeding an input voltage (VDD) and an output () for providing a reset signal (POR) as a function of the input voltage (VDD). The changeover switch () comprises a first input () for feeding a test voltage (VTM), a second input () for feeding a supply voltage (VBAT), a control input () for changing over between the first and the second input () as a function of the test signal (TM), and an output () that is coupled to the voltage input () of the reset circuit ().

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Graz, Austria

Karl Georg Waser