Abstract: A switching power supply (switched-mode power device) includes a rectifier for a mains connection and for rectifying a three-phase AC voltage, a first converter and a second converter, the input voltage of which forms an intermediate circuit voltage, where the first converter regulates the intermediate circuit voltage such that the voltage substantially corresponds to a predefinable output voltage of the second converter multiplied by a load-independent transformation ratio on operation of the second converter with a resonant frequency, where upon forced reduction of the output voltage from the second converter, the first converter can set an, on average, sufficiently low intermediate circuit voltage such that the second converter can be operated substantially with the resonant frequency for a load-independent transformation ratio, where a signal for closed-loop control of the first converter stage can be derived from voltage and/or current information from the second converter.

Abstract: An auxiliary supply for a current supply with at least one transformer with a primary side and a secondary side, wherein the auxiliary supply includes at least one frequency generator arranged on the primary side for generating an alternating voltage with predetermined frequency, a rectifier unit arranged on the secondary side for a secondary-side supply voltage and first and second potential separation units arranged between the primary side and the secondary side, where the first potential separation unit is connected on the primary side via, for example, a high-value impedance to the frequency generator, where on the primary side, the second potential separation unit has a high-frequency coupling to a reference potential assigned to the frequency generator and provides a low-ohmic capacitive connection between a secondary-side reference potential and the primary side, where it is possible to use a voltage drop at the impedance to evaluate the secondary-side supply voltage.

Abstract: An auxiliary supply for a current supply with at least one transformer with a primary side and a secondary side, wherein the auxiliary supply includes at least one frequency generator arranged on the primary side for generating an alternating voltage with predetermined frequency, a rectifier unit arranged on the secondary side for a secondary-side supply voltage and first and second potential separation units arranged between the primary side and the secondary side, where the first potential separation unit is connected on the primary side via, for example, a high-value impedance to the frequency generator, where on the primary side, the second potential separation unit has a high-frequency coupling to a reference potential assigned to the frequency generator and provides a low-ohmic capacitive connection between a secondary-side reference potential and the primary side, where it is possible to use a voltage drop at the impedance to evaluate the secondary-side supply voltage.

Abstract: A switching power supply (switched-mode power device) includes a rectifier for a mains connection and for rectifying a three-phase AC voltage, a first converter and a second converter, the input voltage of which forms an intermediate circuit voltage, where the first converter regulates the intermediate circuit voltage such that the voltage substantially corresponds to a predefinable output voltage of the second converter multiplied by a load-independent transformation ratio on operation of the second converter with a resonant frequency, where upon forced reduction of the output voltage from the second converter, the first converter can set an, on average, sufficiently low intermediate circuit voltage such that the second converter can be operated substantially with the resonant frequency for a load-independent transformation ratio, where a signal for closed-loop control of the first converter stage can be derived from voltage and/or current information from the second converter.

Abstract: An auxiliary supply for a switched mode power supply, which includes at least a transformer with a primary side and a secondary side, wherein the auxiliary supply provides a power supply to units arranged on the secondary side of the switched mode power supply independently of an operating state of the switched mode power supply, where the auxiliary supply in this case, on the primary side, which corresponds to the primary side of the switched mode power supply, has a frequency generator for generating an ac voltage with a predetermined frequency, where on the secondary side, which corresponds to the secondary side of the switched mode power supply, the auxiliary supply has a rectifier unit for a secondary side supply current and/or a secondary side supply voltage, and where a galvanic separation unit, which is particularly formed by two capacitors, is provided between the primary side and the secondary side.

Abstract: A switched-mode power supply unit includes at least two LLC resonant converters connected in parallel and which each include a test circuit that generates a respective test signal that is proportionate to the transmitted current of the associated LLC resonant converter, wherein each respective test signal is supplied to a load controller that modifies at least one switching frequency of an LLC resonant converter such that the test signals converge so as to allow the current or load to be accurately split when a plurality of LLC resonant converters is connected in parallel.

Abstract: An activation circuit for activating a power bridge circuit of a resonance converter, including an inductive activation transformer that transfers a pulsed control signal generated via a CMOS driver to the power bridge circuit, wherein a clamping circuit is arranged at the output of each CMOS driver, where the clamping circuit clamps a primary winding of the activation transformer to a ground potential during the dead time between two pulses of the pulsed control signal such that overvoltages, which otherwise arise when switching the activation transformer inductance, are thus clamped during a dead time and a circuit breaker switches off securely.

Abstract: An activation circuit for activating a power bridge circuit of a resonance converter, including an inductive activation transformer that transfers a pulsed control signal generated via a CMOS driver to the power bridge circuit, wherein a clamping circuit is arranged at the output of each CMOS driver, where the clamping circuit clamps a primary winding of the activation transformer to a ground potential during the dead time between two pulses of the pulsed control signal such that overvoltages, which otherwise arise when switching the activation transformer inductance, are thus clamped during a dead time and a circuit breaker switches off securely.

Abstract: A current inverter including a bridge circuit with four switch elements is provided. Two opposite connector clamps of the bridge circuit are connected to a direct current part of the current inverter, and further two connector clamps of the bridge circuit are connected to an alternating current part of the current inverter. Direct current and alternating current are converted into each other when the switch elements are controlled appropriately. In the direct current part, a first direct current-sided switch element is coupled to a positive direct current clamp, an inductive resistance mounted in series between the first switch element and a first connector clamp and a diode are arranged downstream from the first switch element. A second direct current-sided switch element is mounted in series between the inductive resistance and the diode. A second connector clamp is mounted such that the inductive resistance connects to the second connector clamp.