摘要:
The invention relates to a method and a device for switching on a power switch (S1, S2) arranged between capacitive elements (C1, DLC, B36) a choke (L) being connected in parallel to the switching contacts of the still open power switch (S1, S2). Said choke enables compensating currents to flow between the elements (C1, B36, DLC) to be interconnected and to decay before the power switch (S1, S2) is then closed in a de-energized manner.
摘要:
A device and a method trigger a piezo actuator by use of a DC/DC converter supplying a supply voltage at the output end, the supply voltage is applied to a series connection encompassing a high-side switching transistor and a low-side switching transistor. A series connection containing a high inductance coil and the piezo actuator that is to be triggered is disposed between the junction of the two switching transistors and a reference potential. An excitation signal having a predefined pulse duty factor (effective voltage) and a predefined switching frequency is applied to the junction in order to charge or discharge the piezo actuator.
摘要:
A control device includes a control unit and an evaluation unit that is configured to generate a control signal by which the control unit is impinged upon. The control unit is provided with a voltage source and a reference resistor that can be connected in series to a sensor resistor whose value depends on the temperature thereof. An output voltage of the voltage source drops on the sensor resistor and the reference resistor in the connected state. The reference resistor is dimensioned in such a way that the maximum power loss of the sensor resistor lies in the specified value range of the sensor resistor.
摘要:
The invention relates to a method for switching a semi-conductor circuit breaker by means of which the resistance of the breaker gap of the semi-conductor circuit breaker is controlled by a control voltage (Vst), such that the power loss (Pist) from the circuit breaker does not exceed a predetermined setpoint (Psoll). The invention also relates to a device for carrying out said method wherein a transfer gate, which is controlled by a charge pump, is used as a semi-conductor circuit breaker.
摘要:
A circuit arrangement and also a method for controlling a bistable magnetic valve in which a magnetic valve is to be supplied with a pulse of electrical current in order to switch over the magnetic valve from a first stable state into a second stable state, comprises a power supply source to provide a supply voltage, a power supply device fed by the power supply source and able to be activated for the duration of the current pulse by an entered control signal (Enable) to create a coil current (I) flowing through the magnetic coil, with the coil current (I) being set to a setpoint, where changeover means are provided in order to reduce the setpoint of the coil current during the current pulse. This advantageously allows the power dissipation of the activation of bistable magnetic valves to be reduced.
摘要:
A device for power reduction during an operation of an inductive load, which is operated in a turn-on phase with an increased supply voltage and in a holding phase statically or in PWM operation with the on-board voltage, has a transistor disposed between the on-board voltage source and the inductive load as a switch. A further transistor is connected in series with this transistor and both the source terminals and also the gate terminals of both transistors are connected to one another. With this circuit configuration unwanted current flows are prevented through the substrate diodes of both transistors.
摘要:
A device is embodied for detecting a first variable that is representative of an induced voltage induced by a movement of a valve piston in the coil of a valve. The device is further embodied for determining a second variable representative of a first derivation of a first variable according to time. Furthermore the device is embodied for detecting the end of the movement of the valve piston in the valve if the first variable is greater than a predetermined first threshold value and the second variable drops be low a predetermined second threshold value.
摘要:
A compensation circuit (KS) is provided between the output of a differential amplifier (Diff_Amp) and the input of a controller (R). The compensation circuit generates a compensation signal, whose characteristic curve approximates to that of the parasitic signal, with the same amplitude and frequency (Phi1) as the parasitic signal, but by 180 DEG out of phase. The compensation signal is subtracted from the differential signal (DELTA Vs) and allows the parasitic signal to be eliminated to a great extent.
摘要:
The invention relates to an operating method for an electrical circuit with an energy store (5), made from several storage elements (C2-C5) and a charge-equalisation circuit (6), for charge equalisation between the individual storage elements (C2-C5) of the energy store (5), comprising the following steps: charging the energy store (5) and charge equalisation between the individual storage elements (C2-C5) of the energy store (5) by means of the charge equalisation circuit (6). The invention further relates to a corresponding electrical circuit for carrying out said operating method.
摘要:
The invention relates to a protective circuit for a CAN-bus transceiver that is designed voltagewise for a first vehicle electric system, said transceiver being operated in a second vehicle electric system with a voltage that is several times higher than the voltage of the first vehicle electric system, comprising two diodes arranged between the bus terminal leads of the transceivers whose cathodes are connected to one another and to which a predetermined potential is applied, in addition to a limiting resistor mounted between each of the bus terminal leads of the transceiver and the bus line assigned thereto and two current mirror circuits for maintaining the require voltage level in the bus lines.