Abstract: An inverter for an electric machine as well as a method for operating an inverter for an electric machine. In this context, the inverter has at least one output stage unit for producing a connection between the electric machine and a power supply network, a control unit for controlling the at least one output stage unit, a supply unit independent of the power supply network for the power supply of the output stage unit(s), at least one emergency operation control assigned to the output stage unit(s) for controlling the output stage unit(s) in the fault case, as well as at least one emergency operation supply assigned to the output stage unit(s) for generating a power supply for the output stage unit(s) from the power supply network in the fault case.

Abstract: The invention relates to a method for operating a power output stage (2), in particular an electrical machine, which comprises a bridge circuit (3) with at least one half-bridge (1), wherein the half-bridge (1) has two power semiconductor switches (4, 5) which are connected in series and which are each supplied with an operating control voltage during normal operation in order to set a power voltage, and wherein the power voltage (u4, u5) of the respective power semiconductor switch (4, 5) is detected for the purpose of short-circuit monitoring. In this case, provision is made, in order to check the functioning of the short-circuit monitoring means in a check mode for the power semiconductor switches (4, 5), for a test control voltage which is below the operating control voltage to be set at least temporarily at the same time.

Abstract: An inverter system for operating an electric motor includes an input port for providing an electrical voltage, a bridge inverter circuit connected downstream from the input port for generating an electrical alternating voltage for the electric motor based on the electrical voltage. The bridge inverter circuit has at least one half-bridge branch including switching elements configured to be open for transferring the electric motor into a freewheeling state, and a decoupling switching element designed for decoupling the at least one half-bridge branch in the freewheeling state of the electric motor from the input port, in order to suppress a reaction of the freewheeling electric motor on the input port.

Abstract: The invention relates to a method for operating a power output stage (2), in particular an electrical machine, which comprises a bridge circuit (3) with at least one half-bridge (1), wherein the half-bridge (1) has two power semiconductor switches (4, 5) which are connected in series and which are each supplied with an operating control voltage during normal operation in order to set a power voltage, and wherein the power voltage (u4, u5) of the respective power semiconductor switch (4, 5) is detected for the purpose of short-circuit monitoring. In this case, provision is made, in order to check the functioning of the short-circuit monitoring means in a check mode for the power semiconductor switches (4, 5), for a test control voltage which is below the operating control voltage to be set at least temporarily at the same time.

Abstract: An overvoltage protection circuit is provided for at least one branch of a half-bridge which includes a controllable semiconductor switch element and a free-wheeling diode connected in series and situated on a common circuit substrate. The protection circuit includes a commutation branch connected in parallel with the half-bridge branch, the commutation branch including at least one commutation capacitor also situated on the circuit substrate.

Abstract: An inverter for an electric machine as well as a method for operating an inverter for an electric machine. In this context, the inverter has at least one output stage unit for producing a connection between the electric machine and a power supply network, a control unit for controlling the at least one output stage unit, a supply unit independent of the power supply network for the power supply of the output stage unit(s), at least one emergency operation control assigned to the output stage unit(s) for controlling the output stage unit(s) in the fault case, as well as at least one emergency operation supply assigned to the output stage unit(s) for generating a power supply for the output stage unit(s) from the power supply network in the fault case.

Abstract: An inverter system for operating an electric motor includes an input port for providing an electrical voltage, a bridge inverter circuit connected downstream from the input port for generating an electrical alternating voltage for the electric motor based on the electrical voltage. The bridge inverter circuit has at least one half-bridge branch including switching elements configured to be open for transferring the electric motor into a freewheeling state, and a decoupling switching element designed for decoupling the at least one half-bridge branch in the freewheeling state of the electric motor from the input port, in order to suppress a reaction of the freewheeling electric motor on the input port.

Abstract: A power output stage for a pulse-controlled inverter includes a half-bridge. The half-bridge has a control terminal and power terminals. The power terminals include a terminal for a positive supply voltage, a terminal for a negative supply voltage and a phase voltage terminal. In particular, the power output stage has two half-controlled half-bridges, whose power terminals are connected in parallel, and whose control terminals are not connected to one another.

Abstract: An arrangement comprising a torsionally stressed machine part including two operatively connected torsional spring elements spaced from each other, extending parallel to each other, each spring element being subjected to a separate input torque and having a different spring constant, and a sensor located at a comparision point of the two spring elements for detecting a differential of two input angles of rotation of the two spring elements whereby a differential of the two input torques is determined.

Abstract: The power supply converts alternating current voltage to a direct current voltage which is in turn converted to a pulse width modulated voltage. A circuit arrangement is provided responsive to the pulse width modulated voltage to produce N output direct current voltages each having a different predetermined value, where N is an integer greater than one. A feedback circuit is provided between the circuit arrangement and the circuit providing the pulse width modulated voltage to provide a substantially constant value for the N output voltages when a varying load is presented to the power supply. A current transformer arrangement is coupled in series in the feedback circuit to provide wide bandwidth and low droop without oscillation for the power supply when the power supply is subjected to a step load (a step from no-load up to full-load).

Abstract: A multiwinding inductor is disclosed which inductor is employed in a power control circuit. The power control circuit is of the type having a transformer which has a center tapped primary winding coupled to and associated with a plurality of secondary windings. The primary winding of the transformer is switched by means of switching devices during a power control operation. The inductor has a first winding in the primary which winding has one terminal coupled to the center tap and a second terminal coupled to a generator and a filter arrangement. Another winding of the inductor designated as a free wheeling winding is in series with an auxiliary impedance and has one terminal coupled to the common terminal of the switching devices and a second terminal coupled through a rectifier to the generator. At least two additional windings of the inductor are coupled to suitable rectifier circuits associated with the secondary windings of the transformer.

Abstract: To provide for high efficiency of recuperation of energy stored in the rotating and electromagnetic system of a dynamo electric machine, upon dynamic braking thereof, in which the dynamo electric machine is connected in a chopper-controlled series circuit, a field diode (10) is connected across the field winding (11); a controlled switch (18), for example a transistor or a thyristor, is connected to the junction between the field winding (11) and the aramature (12, 13) and a return line (N) to a storage battery, the controlled switch being controlled to close by a control circuit (19) which opens a brake switch (16) connected between the battery and the dynamo electric machine series circuit under motor operating conditions, to provide for continued current flow through the field, which then is reversely connected by a field reversal switch (8, 9), with continued current flow being maintained by a free-wheeling diode (10) connected across the field.

Abstract: A multiple output power converter utilizing a circuit on the primary side of a power transformer so as to convert a direct current input into an alternating current output. Said circuit utilizing transistor switching and free wheeling diodes so as to provide continuous current to the primary winding of the power transformer and further utilizing a two winding choke filter in said circuit so as to eliminate the need for choke filtering of the direct current output of a secondary.

Abstract: To reliably turn OFF a pulse-controlled thyristor in series with a battery supplied motor circuit, in case of malfunction of the control circuit, or even of the supervisory circuit itself, the voltage across the thyristor is sensed and, if an ON condition of the thyristor, as represented by sensed voltage, is determined while the pulse source does not provide an ON command, a disabling control signal is applied to the pulse source to provide an OFF command; in case of failure of the sensing element, an additional voltage is supplied, through a time delay circuit to the disabling input. Time delay circuits are interposed between the respective sensed signal and command signal and applied through a logic circuit to prevent spurious operation of the monitoring and safety circuit.