Ams Ag

Austriamicrosystems Ag

Dialog Semiconductor (uk) Limited

Dialog Semiconductor Gmbh

Manfred Pauritsch

Peter Trattler

Stefan Wiegele

Werner Schögler

Herbert Lenhard

Werner Schoegler

David Gamperl

Herbert Truppe

A circuit arrangement for an optical monitoring system comprises a driver circuit configured to generate at least one driving signal for driving a light source and a detector terminal for receiving a detector current. The circuit arrangement further comprises a current source configured and arranged to generate at the detector terminal a reduction current. The reduction current has an amplitude which is given by a base value whenever none of the least one driving signal assumes a value suitable for activating the light source and by a sum of the base value and a reduction value otherwise. The circuit arrangement also comprises a processing unit configured to generate an output signal depending on a combination of the detector current and the reduction current.

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

A lighting control system (LCS) for generating supply currents for at least two LED channels (CH, CH, CHn) comprises at least two controlled current sources for generating a supply current for a corresponding LED channel based on a corresponding control signal. The system further comprises at least two signal combiners for generating the corresponding control signals based on a synchronization signal (VSYNC) that comprises periodic starting pulses and on a combination of a magnitude dimming signal and a pulse dimming signal corresponding to one of the LED channels. The signal combiners are designed such that changes of the respective control signals come into effect only with a respective time offset with respect to one of the starting pulses of the synchronization signal.

Lighting control system and method for generating supply currents for LED channels

A driver assembly () for a lighting unit () comprises a control unit (). The lighting unit () comprises a plurality of strands (), wherein each strand comprises a series circuit () of light-emitting diodes and a current source () with a first and a second terminal (), and wherein the series circuit () of diodes is connected between a supply voltage input () of the lighting unit () and the first terminal of the current source () and the second terminal () of the current source is connected to a reference potential terminal via a resistor (). The control unit () is designed for generating a corresponding control signal for a voltage converter () from a respectively adjusted control value, wherein said voltage converter is designed for making available an output voltage at the supply voltage input () of the lighting unit () based on the control signal, for acquiring a measured value at each of the second terminals () of the current sources (), for storing an adjusted control value for each strand () based on the acquired measured values and for detecting whether an error condition exists in one of the strands () based on the stored control values.

Driver assembly and method for detecting an error condition of a lighting unit

A circuit arrangement for controlling a segmented LED backlight in particular, comprises a generator () with a first input () to be supplied with a synchronizing signal (SYNC) that comprises image frequency information and/or line frequency information of a display unit, a second input () to be supplied with a data signal (DATA) that comprises image information of the display unit, and with an output () for providing a modulated signal (MOD).

Circuit configuration and method for controlling particularly segmented LED background illumination

An electronic circuit () to monitor a temperature of a light emitting diode () comprises a current generating circuit () to generate a current flow of at least a first and second current (IC, IC) through the light emitting diode () and a voltage monitoring circuit () to monitor a voltage of the light emitting diode (). The voltage monitoring circuit () is further arranged to determine a difference of a respective value of a first and second voltage (Vf, Vf) of the light emitting diode () to monitor the temperature of the light emitting diode (), wherein the first voltage (Vf) and second voltage (Vf) of the light emitting diode () is determined while driving the first and second current (IC) through the light emitting diode ().

Electronic circuit to monitor a temperature of a light emitting diode

In one embodiment, a charging circuit for a charge accumulator comprises a first terminal (A) for supplying a charging voltage (UC) and for connecting the charge accumulator (SC) connected to a reference potential terminal (), a second terminal (A) for providing a load voltage (UD) and for connecting an electrical load (D), a control assembly (ST) which is coupled to the first and the second terminals (A, A) and has a signal output (A) for providing a first charge state signal (S) and a test output (TA) for providing at test signal (on), and a current source (I) that is coupled to the second terminal (A), wherein the first charge state signal (S) is provided depending on a value of an additional voltage (U) between the first and the second terminals (A, A) and depending on the test signal (on), and wherein the charging voltage (UC) is supplied depending on the first charge state signal (S). The invention also relates to a method for charging a charge accumulator.

Charging circuit for a charge accumulator and method for charging the same

In one embodiment, an electronic lighting system comprises a first light source (L) adapted to emit light with a first brightness as a function of a first driving signal (PWM) having a first frequency (f), at least one second light source (L) having a main light sensor (Als) for providing an brightness of light surrounding the second light source (L), wherein the first light source (L) is arranged in visual connection with the at least one second light source (L). Thereby, the second light source (L) is prepared to emit light with a second brightness as a function of a second driving signal (PWM) with a second frequency (f), the second frequency (f) of the second driving signal (PWM) being adjusted to a light frequency (fL) of the light emitted by the first light source (L), the light frequency (fL) being detected by means of the main light sensor (Als). Furthermore, a method for lighting synchronization is described.

Electronic lighting system and method for lighting synchronization

Circuit arrangement and method for driving segmented LED backlights in particular

A power supply arrangement is specified in which a capacitor with a low internal resistance, in particular a supercap (), is connected via a means for charging () to an input () and via a load current regulator () to a connecting means () for an electrical load (). Together with a feedback path, a control loop is formed for the load current through the electrical load (). It is therefore possible to allow flash operation in applications such as mobile telephones with rechargeable batteries with a high internal resistance, with provision for high energy utilization from the capacitor, with controlled discharging with a regulated current.

Electrical power supply arrangement and use thereof

The invention relates to a circuit arrangement () for a piezo transformer () comprising a driver circuit (), to which the piezo transformer () can be connected, and a current sensor () for the determining an incoming power signal (IM), which is subject to an incoming current (IE) flowing through the piezo transformer (). The invention further relates to the circuit arrangement () of a control unit () for providing a control signal (ST), which is subject the incoming power signal (IM); and an oscillator () having an oscillator output () for emitting an oscillator signal (SO) to a driver signal input () of the driver circuit () subject to the control signal (ST).

Circuit arrangement for a piezo transformer, and method therefor

A current source (), comprising a bipolar transistor () including a control terminal and a controlled path, a first terminal on the controlled path, to which first terminal an electrical load (D, D) may be connected, a second terminal on the controlled path, which second terminal may be connected to a reference potential via a resistor (), a measuring device () coupled to the control terminal for measuring a control current on the control terminal, a compensation device () coupled to the measuring device () and the bipolar transistor () in such a manner that the control current of the bipolar transistor () is compensated for at the first terminal of the controlled path.

Current source, current source arrangement and their use

A circuit arrangement for controlling at least one light source comprises a photodetector (), a sampling circuit () for selectively sampling a photodetector signal (lin) generated by the photodetector () as a function of a first and a second light source (), and a control unit (), which is coupled on the input side to the sampling circuit (). The circuit arrangement further comprises a first power-supply source (), which is coupled to the control unit () and is designed for controlling at least one parameter of a first light source (), and at least one second power-supply source (), which is coupled to the control unit () and is designed for controlling at least one parameter of a second light source (). The circuit arrangement is suitable, for example, for RGB lighting.

Circuit arrangement and method for controlling at least one light source

A voltage converter comprises a first, a second and a third capacitor () which are switched in series in at least one operating state, an input () for supplying an input voltage (VIN), an output () for providing an output voltage (VOUT), and a compensation circuit (). The input () of the voltage converter is coupled to a capacitor from a group comprising the first, the second and the third capacitor (). The output () of the voltage converter is coupled to a capacitor from the group comprising the first, the second and the third capacitor (). The compensation circuit () is coupled to the first, the second and the third capacitor () and adapts a first voltage (V) of the first capacitor (), a second voltage (V) of the second capacitor () and a third voltage (V) of the third capacitor () to one another.

Voltage converter and method for voltage conversion

A circuit arrangement () for driving an electrical load () comprises an input () for feeding a power-supply voltage (Vs) with an AC component and an output () for providing an output signal (Sout) for driving a connectable electrical load (). The circuit arrangement () further comprises a frequency processing circuit () for proving a reference frequency (f) as a function of the AC component, and a demodulator () with a first input () for feeding the reference frequency (f), with a second input () that is coupled to the input () of the circuit arrangement (), and with an output () that is coupled to the output () of the circuit arrangement ().

Circuit arrangement and method for controlling an electrical load

A control circuit for controlling light emitting diodes comprises a switch for turning on or off a string of light emitting diodes. A combiner generates a control signal from a data signal and a noise signal. A sigma delta modulator receives the control signal and a clock signal with a clock period and generates a switching signal for controlling the switch.

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Graz, Austria

Manfred Pauritsch