Robert Boschgmbh

Josef Plager

Thomas Stein

Fabian Hoffmeister

Patrick Engl

Gregor Sauer

Josef Taffner

Martin Maier

Markus Mandl

Christian Glueck

Peter Hallstein

The invention relates to a method for protecting a component () within an audio device () from the exceedance of a maximum internal temperature (TI), wherein a power loss (V) of the component () is determined, a measurement temperature (TM) is measured on the component (), a temperature difference (DT) for the component () between the measurement temperature (TM) on the component and the internal temperature (TI) is determined from the power loss (V) by means of a thermal model () of the component (), the internal temperature (TI) is determined as the sum of the measurement temperature (TM) and the temperature difference (DT), a permissible maximum value (VM) for the power loss (V) is determined on the basis of the internal temperature (TM) and known component data () of the component (), and the component () is operated in a normal operating mode (N) if the power loss (V) does not exceed the maximum value (VM) or the component () is otherwise operated in reduced-power economy operating mode (S) such that the power loss (V) is limited to the maximum value (VM). An audio apparatus (), having an audio device () that internally contains a component () that should be protected from the exceedance of a maximum internal temperature (TI), contains a protection module () for carrying out the method according to the invention.

Method for overtemperature protection and audio apparatus

The invention relates to a method for operating a class-D amplifier () for an audio signal (), which class-D amplifier contains an output stage () and a signal-processing unit () in a signal path (), wherein a voltage (U) of at least two magnitudes (U, U) is provided for the output stage (), a voltage requirement (B) of the output stage () for the audio signal () is predictively determined from the audio signal () at a measurement location () before the signal-processing unit (), a magnitude (U, U) that is minimally sufficient for the voltage requirement (B) is selected on the basis of the voltage requirement (B) and said magnitude is applied to the output stage () before the amplification. A class-D amplifier () for an audio signal (), having a signal path (), which has an output stage () and a signal-processing unit (), contains a voltage source () for the output stage () having a voltage (U) of at least two magnitudes (U, U), a measurement location () before the signal-processing unit (), and a control and evaluation unit () for predictively determining a voltage requirement (B) for the output stage () for the proper amplification of the audio signal () from the audio signal () at the measurement location (), wherein the control and evaluation unit () selects a magnitude (U, U) that is minimally sufficient for the voltage requirement (B) on the basis of the voltage requirement (B) and applies said magnitude to the output stage () before the amplification.

Class-D amplifier and operating method

Converter for the converting a DC input voltage into a DC output voltage, having at least one inductance and capacitance, which are interconnected in a power-conducting path, wherein a current inductance value of the inductance depends on a current value of a current flowing through the coil, having a regulator for regulating the DC output voltage to a setpoint, wherein the regulator comprises a parameter set that determines its regulation behavior, having a measurement module for determining at least one characteristic value of at least one characteristic parameter of the converter, and the converter contains a plurality of interchangeable parameter sets for the regulator, wherein each one of the parameter sets in the regulator can be activated, and having a control module for exchanging and activating each of the parameter sets in the regulator as a function of at least one of the characteristic values.

DC-DC converter with regulator having a plurality of parameter sets

A converter is provided for converting a DC input voltage (UE) into a DC output voltage (UA). The converter includes a regulator for regulating the DC output voltage (UA) to a target value (UAS), wherein the regulator comprises a parameter set that determines the regulation behavior thereof. The converter includes a measurement module for determining at least one characteristic value (K) of at least one characteristic parameter of the converter, and at least two interchangeable parameter sets for the regulator Each one of the parameter sets can be activated in the regulator, wherein a first one of the parameter sets has a slower regulation behavior with regard to the DC output voltage (UA) than a second of the parameter sets. The converter includes a control module for the exchange and activation of each of the parameter sets in the regulator depending on at least one of the characteristic parameters.

An interference suppression stage for a power supply. The interference suppression stage has an input connected to an input module of the power supply, the input module connected to an electrical supply system, an output connected to an output module of the power supply, the output module connected to an electrical load, at least two power paths connected in parallel between input and output, wherein each of the power paths are configured to be switched between an active state and an inactive state, and a control unit configured to switch at least one of the power paths to the inactive state in a saving mode. The control unit switches different power paths alternately in time to inactive in saving mode.

Interference suppression stage and power supply

An amplifier arrangement for amplifying at least one first and one second audio input signal. In one embodiment, the arrangement includes a master amplifier designed as a class D amplifier. The first audio input signal is applied to the master audio input and a master audio output signal is applied to the master audio output. The arrangement also includes a master feedback loop; thus enabling the master amplifier to be designed as a self-oscillating class D amplifier having a master oscillation frequency, at least one slave amplifier, a slave feedback loop, wherein a slave audio output signal or signal portions thereof are fed back into a slave audio input, and a master-slave coupling loop, wherein the master audio output signal or signal portions thereof is coupled into the slave audio input, so that the slave amplifier has the master oscillation frequency as its oscillation frequency.

Amplifier arrangement comprising a master amplifier and at least one slave amplifier

An amplifier arrangement for amplifying an audio input signal AES into an audio output signal AAS, having a conditioning apparatus for converting the audio input signal AES into a conditioned intermediate signal ZS. The conditioning apparatus includes an audio input interface for accepting the audio input signal and a digital data processing device. The amplifier arrangement also includes an amplifier apparatus for amplifying the intermediate signal ZS into the audio output signal AAS and the amplifier apparatus has at least one operating voltage BS. The amplifier arrangement also includes a limiting module for limiting the audio output signal AAS by changing a gain parameter VK.

Amplifier arrangement with limiting module

An amplifier arrangement with a Class D design is proposed which has a low-pass filter device comprising a first inductor and a second inductor The first inductor is arranged between a first load output and a load and the second inductor is arranged between a second load output and the load. The first and second inductors are coupled to one another so that the total inductance of the two inductors is greater than the sum of the individual inductances of the two inductors and also less than or equal to 1.95 times the sum of the individual inductances of the two inductors.

Amplifier arrangement comprising a low-pass filter device

The invention relates to an audio amplifier () for amplifying an input signal into an output signal, comprising an output amplification stage (), wherein the output amplification stage () for the amplification of an intermediate signal into the output signal is designed as an amplifier operating in switching operation, and further comprising a limiter device (), which from a programming and/or a circuit design point of view is designed to generate the intermediate signal on the basis of the input signal, wherein the level of the intermediate signal is always limited by a maximum load as a function of a settable maximum output and a load impedance which is coupled and/or can be coupled the audio amplifier or equivalent parameter thresholds such that the output signal does not exceed the maximum load at the load impedance, or the equivalent parameter thresholds, independently of the input signal.

Audio amplifier having load adjustment and method for the load adjustment of the audio amplifier

Audio amplifiers are used in many known forms in music systems, for example for domestic use or for playing music in cinemas, discos etc., but also in public address systems, as are known, for example, in public buildings, schools, universities etc. for making announcements. The invention proposes an audio amplifier () for amplifying an input signal into an output signal using an output amplifier stage (), wherein the output amplifier stage () is designed to amplify an intermediate signal into the output signal, and wherein the output amplifier stage () is in the form of an amplifier which operates in switching mode, and having a limiter device () which is designed, from a program and/or circuit point of view, to generate the intermediate signal on the basis of the input signal, wherein the level of the intermediate signal is always limited as a function of an adjustable maximum level in such a way that the output signal does not exceed the maximum level independently of the input signal.

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Bogen, Germany

Josef Plager