A method for detecting the state of a load device which can be connected to a switching connection, wherein the switching connection can be coupled to, and decoupled from, a predefined switching potential. A voltage drop across the switching connection is used as a basis for detecting whether the load device is connected to the switching connection, the load device is not connected to the switching connection or there is a short circuit between the switching connection and a first or a second switching potential. An additional current source is connected to the switching connection at the same time as the switching connection is decoupled from the predefined switching potential.

Method and circuit arrangement for detecting the state of a load device which can be connected to a switching connection

A method for measuring the insulation resistance in an information technology (IT) network. The IT network has a DC voltage intermediate circuit and at least one self-commutated converter having at least one first and one second power switch. The IT network also includes a measuring arrangement for measuring the intermediate circuit voltage relative to ground potential comprising a voltage divider and two assigned potential measuring devices. The method has an offline and an online measurement, wherein, during the offline measurement, all of one of the first and second power switches are closed and the potentials Up and Um, respectively, and also the intermediate circuit voltage are measured and the insulation resistance Rf is determined therefrom. During the online measurement, the two potentials Up and Um are measured and the temporal profile of the measurements is compared with the offline measurement.

Method for measuring the insulation resistance in an IT network

A method for monitoring a power output stage including at least one half bridge with upper and lower semiconductor switches connected in series, wherein the semiconductor switches are controllable alternately to a switched-on state and a switched-off state by pulse-width modulated pulses, includes measuring a first voltage across the lower semiconductor switch when the upper semiconductor switch is switched on and measuring a second voltage across the lower semiconductor switch when the lower semiconductor switch is switched on, comparing a difference between the operating voltage and the first voltage to a predetermined voltage and comparing the second voltage with the predetermined voltage, which is the maximum permissible voltage across a semiconductor switch when it is switched on, and determining that the power output stage or the output of the at least one half bridge is faulty when at least one of the difference and the second voltage is greater than the predetermined voltage.

Method for monitoring a power output stage

In a control drive circuit for an electric power tool, a bridge-structured motor, which has a bridge structure and includes switching elements and a motor body, is connected to a power supply unit without any mechanical contacts, and an electric power is supplied to a control circuit for controlling the switching elements by turning on a trigger switch. Further, a circuit switch is provided at power supply sides of drive circuits for driving the switching elements, the circuit switch being controlled by the control circuit to interrupt supply of the electric power to the drive circuits.

Control drive circuit for electric power tool

The invention concerns a device for controlling a final power-output stage, the latter comprising three half-bridges consisting respectively of a series circuit including an upper semiconductor switch and a lower semiconductor switch and subjected to a service voltage, the connection points of the semiconductor switches of the half-bridges forming outputs which are connected to the windings of a motor having at least three phases. The invention is characterized in that there is provided a control device for shifting on-state respectively one semiconductor switch or simultaneously several semiconductor switches according to a predetermined programme and for determining whether the respective voltages at the outputs are respectively within a predetermined tolerance range for the corresponding switching state.

Arrangement for testing a power output stage

A testing arrangement for a switching circuit, especially for a high current electric motor (1), comprises at least one buffer capacitor (3) and power end step (2) joined through a controllable switch to an operating voltage. A limiting current source is connected around the switch and an error signal given if the capacitor potential (7) lies outside a given region.

Apparatus for checking a circuit

In a method and an arrangement for testing a power output stage, the power output stage having at least one consisting of a series circuit of an upper and a lower semiconductor switch and is acted upon with operating voltage half-bridge, and wherein the connection point of the semiconductor switches of at least one half-bridge forming an output, it is provided that be carried out by a control device the steps of: checking whether the voltage is not controlled in the conductive state semiconductor switches at the output in a predefined average tolerance range, checking whether in the conductive state switched upper semiconductor switches, the voltage at the output in a predetermined upper tolerance range, checking whether the output voltage is switched into the conductive state lower semiconductor switches in a predetermined lower tolerance range, and that the power output stage detected as error-free is when all the output voltages are within the respective tolerance range.

Method and device to monitor a power output stage

An arrangement for testing a power output stage, with the power output stage includes at least one half bridge with an upper semiconductor switch and a lower semiconductor switch connected in series and to which an operating voltage is applied. A junction point between the semiconductor switches of the at least one half bridge forms an output. A control device performs a test to determine whether the voltage at the output is within a predetermined central tolerance band when the semiconductor switches are not switched on, a test to determine whether the voltage at the output is within a predetermined upper tolerance band when the upper semiconductor switch is switched on, and a test to determine whether the voltage at the output is within a predetermined lower tolerance band when the lower semiconductor switch is switched on. The power output stage is identified as being sound when all of the output voltages are within the respective tolerance bands.

Method and arrangement for testing a power output stage

Bei einer Anordnung zur Prufung einer Schaltungsanordnung mit einer Leistungsendstufe, insbesondere fur Elektromotoren mit hoher Stromaufnahme, wobei die Leistungsendstufe und mindestens ein Puffer-Kondensator uber einen steuerbaren Schalter mit einer Betriebsspannungsquelle verbunden sind, wobei eine einen begrenzten Strom liefernde Stromquelle unter Umgehung des steuerbaren Schalters an dem mindestens einen Kondensator angeschlossen ist und wobei eine Verzogerungseinrichtung vorgesehen ist, die den steuerbaren Schalter erst einschaltet, wenn der mindestens eine Kondensator mit Hilfe der Stromquelle etwa auf die Betriebsspannung aufgeladen ist, sind Mittel zur Messung des Spannungsverlaufs am Kondensator und zur Erzeugung einer Fehlermeldung, wenn der Spannungsverlauf auserhalb eines vorgegebenen Bereichs liegt.

Anordnung zur Prüfung einer Schaltungsanordnung

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Apparatus for checking a circuit

Method and device to monitor a power output stage

Method and arrangement for testing a power output stage

Anordnung zur Prüfung einer Schaltungsanordnung