Abstract: A frequency converter includes an intermediate circuit without any capacitors and an electronics which is supplied with power from a power supply device. The power supply device has a buffer capacitor which is disposed on an input side of the power supply device and connected electrically in parallel with the intermediate circuit. Connected to the buffer capacitor is a supply line in which a decoupling diode is disposed. A semiconductor adapted to be switched off is connected electrically back-to-back in parallel with the decoupling diode and has a control output which is connected to an output of an identification device for recognizing a power-line failure.

Abstract: A frequency converter includes an intermediate circuit without any capacitors and an electronics which is supplied with power from a power supply device. The power supply device has a buffer capacitor which is disposed on an input side of the power supply device and connected electrically in parallel with the intermediate circuit. Connected to the buffer capacitor is a supply line in which a decoupling diode is disposed. A semiconductor adapted to be switched off is connected electrically back-to-back in parallel with the decoupling diode and has a control output which is connected to an output of an identification device for recognizing a power-line failure.

Abstract: A method and a device for bridging temporary power outages in a matrix converter are disclosed. In the event of a detected power failure, the matrix converter is disconnected from the power line and changes into a buffer mode in which a determined actual capacitor voltage space vector is regulated to a predetermined space vector. When the power line is reestablished, the actual capacitor space vector is synchronized and the matrix converter is reconnected to the power line during the synchronization. This allows a conventional matrix converter to take advantage of kinetic load buffering.

Abstract: A method and a device for bridging temporary power outages in a matrix converter are disclosed. In the event of a detected power failure, the matrix converter is disconnected from the power line and changes into a buffer mode in which a determined actual capacitor voltage space vector is regulated to a predetermined space vector. When the power line is reestablished, the actual capacitor space vector is synchronized and the matrix converter is reconnected to the power line during the synchronization. This allows a conventional matrix converter to take advantage of kinetic load buffering.

Abstract: A controlled drive circuit for an analog controlled power semiconductor includes a digitally operating logic module, which has a control input receiving control signals from an A/D converter and a control output supplying processed control signals to a D/A module that converts the processed digital control signals signal to an analog or quasi-analog control variable that controls the power semiconductor.

Abstract: A method for controlling a matrix converter with nine bidirectional power switches arranged in a 3×3 switch matrix is described. Switching states of a modulation period are each calculated with associated time intervals by using a space vector modulation method. According to the invention, these calculated switching states are each divided into switching states of an output phase of the matrix converter, with time intervals assigned to the switching states, wherein the time intervals and the output-phase-related switching states are placed into one-to-one correspondence. Depending on the measured input voltages, the output-phase-related switching states with associated time intervals are combined into a pulse train of a modulation period, so that a sequential commutation always occurs to a nearest input voltage. This significantly reduces the switching losses of a matrix converter.

Abstract: A method and a device for protecting a matrix converter is disclosed. The matrix converter has nine bi-directional circuit-breakers which are arranged in a 3×3 switch matrix. A highest potential is detected from all input and/or output potentials or from all input potentials and at least one output potential. Bi-directional circuit-breakers of the matrix converter are controlled when a predetermined threshold value is exceeded. This arrangement protects the entire matrix converter from overvoltages. The converter can be produced easily and cost-effectively.

Abstract: A low-inductivity busbar system for a matrix converter which includes a plurality of switch elements, in particular semiconductor switches, disposed in a 3×3 matrix. The matrix converter is connected on the network side by the busbar system to a plurality of capacitor elements for supply of three input voltage potentials to the matrix converter. The busbar system includes of a plurality of busbar sections disposed in two levels and isolated from one another.

Abstract: A method for controlling a matrix converter with nine bidirectional power switches arranged in a 3×3 switch matrix is described. Switching states of a modulation period are each calculated with associated time intervals by using a space vector modulation method. According to the invention, these calculated switching states are each divided into switching states of an output phase of the matrix converter, with time intervals assigned to the switching states, wherein the time intervals and the output-phase-related switching states are placed into one-to-one correspondence. Depending on the measured input voltages, the output-phase-related switching states with associated time intervals are combined into a pulse train of a modulation period, so that a sequential commutation always occurs to a nearest input voltage. This significantly reduces the switching losses of a matrix converter.

Abstract: A hybrid power MOSFET, comprising a MOSFET and a junction FET, the MOSFET and the junction FET being electrically connected in series is disclosed. In accordance with the present invention, the hybrid power MOSFET is provided with a device for reducing the change in the gate voltage of the junction FET. Thus, a hybrid power MOSFET is obtained in which high over-voltages no longer arise and whose EMC response is much improved.

Abstract: The invention relates to a device for effecting the basic interference suppression of a matrix converter (2) comprising an input filter (10) provided with capacitors (14). According to the invention, a suppression capacitor (CY1,CY2,CY3) is provided for each input phase (U, V, W) of the matrix converter (2). Said suppression capacitors are electrically connected in star, and the star point (16) thereof is connected in an electrically conductive manner to the ground potential. These suppression capacitors (CY1,CY2,CY3), which are electrically connected in star, are electrically connected in parallel to the capacitors (14) of the input filter (10). By using few capacitors and an input filter (10) of a matrix converter (2), a device is thus obtained for effecting the basic interference suppression of the matrix converter (2). This device can also be considered, analogous to a frequency converter, as a network filter.

Abstract: A controlled drive circuit for an analog controlled power semiconductor includes a digitally operating logic module, which has a control input receiving control signals from an A/D converter and a control output supplying processed control signals to a D/A module that converts the processed digital control signals signal to an analog or quasi-analog control variable that controls the power semiconductor.

Abstract: A low-inductivity busbar system for a matrix converter which includes a plurality of switch elements, in particular semiconductor switches, disposed in a 3×3 matrix. The matrix converter is connected on the network side by the busbar system to a plurality of capacitor elements for supply of three input voltage potentials to the matrix converter. The busbar system includes of a plurality of busbar sections disposed in two levels and isolated from one another.

Abstract: A method and an apparatus for turning off a cascode circuit comprising a series circuit formed by a low-blocking-capability and high-blocking-capability semiconductor switch, are described. When a turn-off command arrives, the gate voltage of the low-blocking-capability semiconductor switch is controlled in such a way that its drain voltage is held constant in the active range of the low-blocking-capability semiconductor switch. Consequently, an impermissible overvoltage at high potential of the cascode circuit at low potential is detected and actively limited.

Abstract: A method for controlling positive or negative freewheeling paths of the phases of a matrix converter with nine bidirectional power switches arranged in a 3×3 switch matrix is described. Each power switch has two back-to-back series-connected semiconductor switches. Those semiconductor switches are actuated that have the most positive/negative line voltage to provide a negative/positive freewheeling path capable of carrying a negative/positive load current. The matrix converter can be immediately disconnected if an error is detected or if the matrix converter is inadvertently switched off, without damaging the matrix converter.

Abstract: A method for producing a microelectronic component of sandwich construction, which includes the steps of providing a first substrate which has a first conductor track plane, providing a plurality of semiconductor chips which have first contact faces electrically connected to the first conductor track plane, and second contact faces opposite the first sides. The method furthermore includes providing a second substrate which has a second conductor track plane with contact points, securing electrically conductive balls to the contact points of the second conductor track plane using an electrically conductive, flexible adhesive, applying an electrically conductive, flexible adhesive to the second contact faces of the plurality of semiconductor chips, and joining the first substrate and the second substrate together.

Abstract: A method for controlling positive or negative freewheeling paths of the phases of a matrix converter with nine bidirectional power switches arranged in a 3×3 switch matrix is described. Each power switch has two back-to-back series-connected semiconductor switches. Those semiconductor switches are actuated that have the most positive/negative line voltage to provide a negative/positive freewheeling path capable of carrying a negative/positive load current. The matrix converter can be immediately disconnected if an error is detected or if the matrix converter is inadvertently switched off, without damaging the matrix converter.

Abstract: A method and a device for protecting a matrix converter is disclosed. The matrix converter has nine bi-directional circuit-breakers which are arranged in a 3×3 switch matrix. A highest potential is detected from all input and/or output potentials or from all input potentials and at least one output potential. Bi-directional circuit-breakers of the matrix converter are controlled when a predetermined threshold value is exceeded. This arrangement protects the entire matrix converter from overvoltages. The converter can be produced easily and cost-effectively.

Abstract: Method and apparatus for controlling a turn-off power converter valve having at least two series connections. Each non-latching power semiconductor switch of this power converter valve has an active collector-emitter limiting circuit. When a rising edge of a drive signal that is provided arrives, a predetermined value of the reference limited voltage of the active collector-emitter limiting circuit is decreased to a low value and is increased to the predetermined value again during a turn-off operation. Using a switch-on command, it is possible to balance the voltage sharing on the non-latching power semiconductor switches of a turn-off power converter valve having at least two series connections.

Abstract: A power converter device includes a power part accommodated in a first casing, and an electronic part accommodated in a separate second casing. The power part and the electronic part are connected to one another through a signal transmission arrangement, e.g. a cable or a radio communication. The power converter device thus has spatially separated power and electronic parts to realize a thermal separation as well and to enable a more compact overall configuration.