Fujitsu Technology Solutions Intellectual Property Gmbh

Siemens Nixdorf Informationssysteme Aktiengesellschaft

Fujitsu Siemens Computers Gmbh

Pcs Pc-systeme Entwicklungs-und Produktionsgesellschaft Mbh & Co. Kg

Fujitsu Corporation

Peter Busch

Willi Sterzik

Helmut Rettenmaier

Peter Kastl

Robert Ruef

Jurgen Adam

Corinna Kammerer

J&uuml;rgen Adam

Werner Sausenthaler

Hans-Juergen Pelz

Hans-Jürgen Pelz

Erwin Huber

A power supply unit arrangement for an electronic device includes a first switching converter with a first control loop that provides a controlled output voltage (DC-out) at a node; a second switching converter with a second control loop that alternatively provides the controlled output voltage (DC-out) at the node; and an open-loop control circuit connected to the first control loop and the second control loop, wherein the open-loop control circuit, upon a changeover of the current supply from the first switching converter to the second switching converter, sets a predetermined control state of the first control loop and deactivates the first switching converter and, upon a changeover of the current supply from the second switching converter to the first switching converter, reactivates the first switching converter using the predetermined control state.

Power supply unit arrangement for an electronic device, power supply for an electronic device having at least a high-load state and a low-load state and computer system having a normal operating state and at least one energy saving state

A power supply unit for a computer system including a first converter circuit with a first control circuit that converts an input-side electrical supply voltage into at least one first output voltage, a second converter circuit with a second control circuit that converts the input-side supply voltage into at least one second output voltage, wherein an output of the first converter circuit directly electrically connects to an output of the second converter circuit, a nominal level of the at least one first output voltage is higher by a predetermined voltage difference than a corresponding nominal level of the at least one second output voltage, the power supply unit includes an additional circuit on the input side of the second converter circuit, which additional circuit controls the second control circuit such that the second converter circuit operates with a minimum output power when the first converter circuit provides the at least one first output voltage.

Power supply unit for a computer system and arrangement having a corresponding power supply unit and a computer system

A closed-loop control circuit for an auxiliary power supply unit includes a control loop for the closed-loop control of a voltage transformer of the auxiliary power supply unit via a controlled variable to produce a setpoint voltage, wherein the control loop includes an additional circuit that limits a change in the controlled variable in the event of provision of an external voltage of a main power supply unit at a first output for emitting voltage generated by the auxiliary power supply unit when the external voltage exceeds a setpoint voltage of the auxiliary power supply unit.

Closed-loop control circuit for an auxiliary power supply unit and power supply unit arrangement

A regulating circuit that regulates rotary speed of a pulse-width modulated fan includes a measuring device that determines a period duration (T) of a tacho signal (TACH) of the fan, a digital regulating register that acquires a regulation value to drive the fan on the basis of a determined period duration (T) and a desired value (T), a digital control register that adjusts a duty ratio to drive the fan, the digital control register has a smaller register width than the digital regulating register, and a controller that updates the digital control register by evaluating a predetermined number of more significant bits of the digital regulating register.

Regulating circuit and method for regulating rotary speed, data processing device, and program code

A switched-mode power supply unit for a computer includes at least one switching element that switches a charging current to charge a storage element, at least one secondary output circuit that provides an output voltage (Vout+), at least one controllable oscillator circuit that provides a switching clock, and at least one control circuit that determines a switch-off time for the at least one switching element, wherein, in operation of the switched-mode power supply unit, a mean oscillator clock of the oscillator circuit is controlled in dependence on a controlled variable (Vcontrol) specifying the output voltage or power of the secondary output circuit such that the mean oscillator clock rises monotonously with the output power and a switch-on time for the at least one switching element is determined in dependence on the mean oscillator clock and a random deviation.

Switched-mode power supply unit, method of operation and use of a switched-mode power supply unit in a computer

A switched-mode power supply unit includes a mains input connecting the power supply to a primary supply voltage; an input circuit including a shared electrical path connected to the mains input and including a first mains filter, a first electrical path, connected in series with the shared electrical path, including a second mains filter, a second electrical path connected in series with the shared electrical path and connected in parallel with the first electrical path, and a first switching element that opens the first electrical path; a supply output that provides a filtered primary supply voltage; a switched-mode converter coupled to the supply output that converts the filtered primary supply voltage to a secondary supply voltage; and a control circuit that selectively switches the power supply unit to a first mode of operation with a high power output or a second mode of operation with a reduced power output.

Input circuit for an electrical device, use of an input circuit and electrical device

A circuit arrangement with a power input and at least one power supply unit that generates a DC voltage for operating an electronic device including a power input circuit inserted between the power input and the at least one power supply unit that selectively disconnects or rectifies an AC voltage provided via the power input for the at least one power supply unit, wherein the power input circuit has at least one first semiconductor switching element that switches a first electrical load path with a current limiting element from the power input to the at least one power supply unit, and at least one second semiconductor switching element that switches a second electrical load path from the power input to the at least one power supply unit, and a power input filter, wherein the power input filter includes a first filter circuit arranged between the power input and the power input circuit and a second filter circuit arranged between the power input circuit and the at least one power supply unit.

Circuit arrangement with a power input and an operating method for controlling a power input circuit

A circuit arrangement includes a switching element that switches a load current, a current-limiting element connected in series to the switching element, a bistable first relay connected in parallel to the switching element and the current-limiting element, and a control circuit that switches the power-supply unit from a first operating state to a second operating state in which a load current for generating a DC voltage flows from the power grid to the power-supply unit, such that the control circuit turns on the switching element for a first time period during switching of the power-supply unit from the first to the second operating state, to turn the bistable relay on during the first time period, and to turn the switching element off at the end of the first time period.

Circuit arrangement and control circuit for a power-supply unit, computer power-supply unit and method for switching a power-supply unit

A line filter includes at least one X capacitor located between two supply lines and at least one discharge resistor that discharges the X capacitor, wherein the discharge resistor is arranged in series with at least one switching element, and at least one detector circuit that detects a network disconnection and closes the switching element to discharge the X capacitor via the discharge resistor when a network disconnection is recognized.

Line filter and use of a line filter

The invention relates to a circuit unit for driving an electronically commutated fan motor with a power stage for driving windings of the fan motor and with a control stage for driving the power stage. The circuit unit is distinguished in that an operating voltage of the control stage is separated from an operating voltage of the power stage by a diode and in that an arrangement is provided for smoothing the operating voltage of the control stage.

Circuit unit for driving an electronically commutated fan motor

A computer system has at least one supply device, at least one system component with a data-processing device and at least one communications device. The supply device has at least one programmable control module that is supplied with an operating energy by a voltage source coupled to the at least one supply device and operated independently thereof.

Computer system and method for energy-saving operation of a computer system

A control unit for driving a regulating transistor () of a fan arrangement, in which the regulating transistor () is connected in series with an electronically commutated fan (), having control means (, R, R) for the analog driving of the regulating transistor () with a control signal (U) in a manner dependent on a control input voltage (U). The control unit comprises compensation means (R, R) for influencing the control signal (U) in a manner dependent on an AC voltage component (U) of an operating voltage (U) of the fan arrangement, so that the AC voltage component (U) of the operating voltage (U) is completely or partially compensated for in a voltage across the fan ().

Control unit for driving a regulating transistor of a fan arrangement

A method for detecting commutation pulses of a fan motor with continuous measurement and storage of voltage values that are proportional to the fan current within predetermined time intervals. The measured voltage values are continuously evaluated by comparing two measured values that were obtained at different times. A result signal is outputted if the deviation between the compared measured values fulfills a predetermined constraint.

Method for detecting communication impulses of a fan motor and circuit arrangement for carrying out said method

A fan regulation circuit configuration includes an input receiving an input voltage (proportional to fan current and forms a first comparison voltage), a low-pass filter (filters input voltage and a filter output voltage is tapped off as second comparison voltage), a first comparison device for commutation identification (outputs signal indicating a commutation if value of one of the comparison voltages multiplied by first factor is greater than the other comparison voltage), and a regulator (outputs a control voltage dependent upon identified commutation pulses). The circuit has self-adjusting sensitivity adaptation and a second comparison device outputting a signal if the value of one of the comparison voltages multiplied by a second factor is greater than the other comparison voltage, the second factor being less than the first factor. A control device decreases the first and second factors in the event of an output signal of the second comparison device being received to reduce the sensitivity of the commutation identification.

Circuit configuration for fan regulation

The invention relates to a circuit arrangement for measuring the current consumption of a transistor-controlled load, in particular of an electromotor, whereby a load current (I) is detected by measuring the controlling current (I) of an output bipolar transistor (T). The controlling current (I) is detected using the voltage drop across an internal measuring shunt (R). As the controlling current (I) is substantially smaller than the load current, the power losses are negligible in comparison with a measuring shunt that is connected in series to the load. In addition, there is no need for a controlling unit input, to which an external measuring-circuit voltage is applied.

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Augsburg, Germany

Peter Busch