Siemens Aktiengesellschaft

Daniel Portisch

Christian Augesky

Michael Bauhofer

Hans Drescher

Circuit arrangement via which a voltage type and value of an input voltage of a power supply or a switching-mode power supply is ascertained is configured such that the input voltage of the power supply decreases at the input side and includes a differential amplifier for converting the input voltage into a signal rectified by a first rectifier such that a forward voltage of the first rectifier is compensated, includes an inverter which generates an inverted signal rectified by a second rectifier such that a forward voltage of the second rectifier is compensated, includes a mixer via which a first output signal is generated from the useful signals, from which first output signal a second output signal is derived via a filter such that the voltage type is determinable from the first output signal, and a voltage value of the input voltage can be determined from the second output signal.

Method and circuit arrangement for ascertaining a type and value of an input voltage

Uninterruptible power supply system and method for reconditioning an exhausted battery module, wherein a terminal voltage of the battery module is determined and compared with a predefinable threshold value after starting a network-side supply, where after a waiting time has elapsed, when the threshold value is fallen below, an inverse polarity protection unit is activated for a time pulse, such that when communication between the base unit and the battery module occurs, the inverse polarity protection unit is permanently switched on and a voltage drop is determined and compared within the battery module with a predefined minimum voltage, and if at least one determined voltage drop falls below the predefined minimum voltage, then a predefined charging voltage is applied to the battery module until either a predefinable period of time is exceeded or a predefinable current value is surpassed by a charging current determined in the base unit.

Uninterruptible power supply system and method for reconditioning an exhausted battery module

A switch mode power supply and method for operating the power supply and to the use of the same, wherein the switch mode power supply comprises a control for controlling a control element and is connected to a DC link of the converter, the switch mode power supply comprises a startup-delay such that control of the switch element is blocked until a predetermined start delay duration (T) has lapsed, where the start delay duration (T) is longer than the time span between DC link charging.

Switch mode power supply and method for operating the switch mode power supply

A bidirectional flyback converter circuit includes a transformer with inductively coupled primary and secondary windings, primary-side and secondary-side switching elements, wherein the primary winding and secondary windings are respectively connected to a voltage input and output, where the primary-side and secondary-side switching elements are respectively arranged in series with the primary and secondary windings, where a charge capacitor is connected via a first terminal to a common potential of the primary and secondary sides, where with a second terminal, the charge capacitor is connected via a first diode to a common potential of the primary-side switching element and primary winding and via a second diode to a common potential of the secondary-side switching element and secondary winding, and where a buck converter is arranged on the input or output side, through which a voltage present at the charge capacitor can be regulated to a predeterminable value.

Bidirectional flyback converter circuit

A power supply has a switch converter, a circuit breaker, a storage inductor and a peak current controller, wherein a first shunt resistor is arranged in a positive cable, a first operational amplifier is connected the first shunt resistor to detect a voltage drop across the first shunt resistor, an auxiliary measuring signal at the output of the first operational amplifier is reflected via a current mirror to ground, a second operational amplifier is connected to the second shunt resistor for impedance amplification such that a DC measuring signal is present at the output of the second operational amplifier, an RC element having a resistor and capacitor is connected to an inductor, the RC element being configured such that an AC measuring signal at the output of the RC element reproduces a current through the storage inductor, and where the AC measuring signal is added to the DC measuring signal.

Power supply with a switch converter

A switching converter and method for controlling a switching converter in a quasi resonant mode of operation, wherein a sense voltage is predefined for a PWM controller to determine a switch off time of a switching element, a switch-on time of the switching element also falls in a valley of an oscillating voltage that is being applied to the switched-off switching element, and where the sense voltage is reduced in each valley occurring after a switch-off operation such that a stable operating point is thus reached under any load.

Switching converter and method for controlling the switching converter

A method of operating a DC-DC converter according to the current mode control is provided. A current measuring signal for determining a turn-off time of a converter switching element is supplied to a PWM controller and a voltage that is proportional to the current measuring signal is compared by a comparator to a reference voltage. When the reference voltage is exceeded, the converter switching element is turned off.

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Kleinhadersdorf, Austria

Daniel Portisch