Abstract: A bridge leg switching a DC voltage to produce an AC voltage at its output terminal for supply to an inductive load. The bridge leg has first, second, third, and fourth switch assemblies, and at least a first inductive element. The first and second switch assemblies are serially connected between the bridge leg input terminals, the bridge leg output being formed at a point of interconnection of the first and second switch assemblies. The third and fourth switch assemblies are serially connected between the bridge leg input terminals, the inductive element being connected between a point of interconnection of the third and fourth switch assemblies and the bridge leg output. The third and fourth switch assemblies are controlled such that reverse current through either of the first or second switch assembly is reduced compared to bridge leg output current prior to the moment the bridge leg output is switched.

Abstract: A bridge leg switching a DC voltage to produce an AC voltage at its output terminal for supply to an inductive load. The bridge leg has first, second, third, and fourth switch assemblies, and at least a first inductive element. The first and second switch assemblies are serially connected between the bridge leg input terminals, the bridge leg output being formed at a point of interconnection of the first and second switch assemblies. The third and fourth switch assemblies are serially connected between the bridge leg input terminals, the inductive element being connected between a point of interconnection of the third and fourth switch assemblies and the bridge leg output. The third and fourth switch assemblies are controlled such that reverse current through either of the first or second switch assembly is reduced compared to bridge leg output current prior to the moment the bridge leg output is switched.

Abstract: The present invention relates to a switched power converter including a base plate on which at least one heat sink is arranged. The converter further includes at least one power transistor arranged on a side of the at least one heat sink. Further, at least one spring element is arranged to press against the power transistor arranged on a side of the at least one heat sink and an oppositely facing side of either an adjacent heat sink or a base plate end face parallel to the at least one heat sink.

Abstract: The present invention relates to a switched power converter comprising a base plate on which at least one heat sink is arranged. The converter further comprises at least one power transistor arranged on a side of the at least one heat sink. Further, at least one spring element is arranged to press against the power transistor arranged on a side of the at least one heat sink and an oppositely facing side of either an adjacent heat sink or a base plate end face parallel to the at least one heat sink. This is highly advantageous in that a force is applied to the power transistor by the spring element. This will press the power transistor against the heat sink on whose side the transistor is arranged. Thermal contact is thus established between the power transistor and the heat sink, and heat dissipation from the transistor via the heat sink is greatly facilitated. Further, the spring elements are a cost-effective way of attaining a high compressive force on the power transistors.

Abstract: It is presented a gate driver circuit for driving an electric switch, the switch being arranged to control a main current using a gate signal. The gate driver circuit comprises: a non-linear capacitor means having a lower capacitance when an applied voltage is under a threshold voltage and a higher capacitance when an applied voltage is over the threshold voltage, wherein the non-linear capacitor is arranged to be connected between a high voltage connection point of the switch and a connection point for the gate signal; a current change rate sensor, the current change rate sensor being configured to detect changes in a main current of the electric switch and to control a gate signal of the electric switch depending on the current change; a gate buffer; and at least one current source, arranged to drive the gate buffer. The current change rate sensor is connected to control the current source to thereby control the gate signal of the electric switch.

Abstract: It is presented a gate driver circuit for driving an electric switch, the switch being arranged to control a main current using a gate signal. The gate driver circuit comprises: a non-linear capacitor means having a lower capacitance when an applied voltage is under a threshold voltage and a higher capacitance when an applied voltage is over the threshold voltage, wherein the non-linear capacitor is arranged to be connected between a high voltage connection point of the switch and a connection point for the gate signal; a current change rate sensor, the current change rate sensor being configured to detect changes in a main current of the electric switch and to control a gate signal of the electric switch depending on the current change; a gate buffer; and at least one current source, arranged to drive the gate buffer. The current change rate sensor is connected to control the current source to thereby control the gate signal of the electric switch.

Abstract: The present invention relates to an electrical drive unit comprising a circuit board, a plurality of components, attached to a first side of the circuit board, a heat sink, arranged on the first side of the circuit board, a positioning assembly, arranged on a second side of the circuit board opposite the first side of the circuit board. The circuit board comprises a plurality of holes between the first and second sides, where through the positioning assembly has a plurality of protrusions arranged against the plurality of components, such that each component of the plurality of components individually is pressed against the heat sink by the positioning assembly.

Abstract: This invention propose a way of controlling the flux density in a current transformer to keep the transformer core saturated between two consecutive measurements in a sampling measurement system. Saturation disables transformation of primary to secondary current, and thereby disables losses in the secondary circuit during this time. Both AC and DC currents are possible to measure. The use of saturation of the transformer core also permits the core to be designed physically very small. In order to get effective and accurate low power consuming measurements, both the magnetic fields originating from primary current flowing in the primary winding and external magnetic fields must be symmetrically physically spread in the transformer core. This greatly limits the possible physical arrangement of the primary winding.

Abstract: A power terminal for electrical connection of an electric cable to a circuit board comprises a main body (8a) having a central longitudinal axis and means (12, 12a) for attaching a cable to the main body. An eccentric body (8b) integral with the main body (8a) and having a through hole (13) is arranged to receive a screw. A space (20) is provided at the bottom of the power terminal adjacent to the eccentric body. This configuration provides a means for securing the terminal in an easy and efficient way while also providing for mounting of a current measuring device, for example.

Abstract: A control circuit arrangement for an electric motor drive unit includes a circuit board (10), a heat conductive substrate (12) carrying power semiconductors (13), a heat absorbing mounting structure (14) disposed in heat transferring contact with the heat conductive substrate (12), and a clamping structure (20) for clamping the circuit board (10) and the heat conductive substrate (12) to the mounting structure (14). A number of electrically conductive distance or spacer tube elements (22) are disposed between the circuit board (10) and the heat conductive substrate (12) for distributing the clamping force of the clamping structure (20) from the circuit board (10) to the heat conductive substrate (12) while forming electrically conductive leads between the circuit board (10) and the heat conductive substrate (12).