Method for operating capacitive adjustment means
A technology for adjusting components and capacitors, applied to electrical components, parts of piezoelectric devices or electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve problems such as not being able to see the full bridge
Active Publication Date: 2018-02-23
VTESCO TECH GMBH
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Problems solved by technology
The converter circuit there is formed with power elements connected into a half-bridge, but it should also be possible to operate with a full-bridge, but there is no way to see how this full-bridge should be connected
Method used
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[0016] FIG. 1 shows a device for charging and discharging a capacitance-adjusting member configured as a piezoelectric injector PI, in which a first capacitor C1 arranged between an input terminal E and a reference potential GND is connected to a direct voltage converter DCDC and can be charged to the input voltage by the DC voltage converter. The direct voltage converter DCDC generates on its side the corresponding required input voltage of the device from, for example, the battery voltage of the motor vehicle.
[0017] In parallel with the first capacitor C1 is connected a series circuit consisting of a first power switching element configured as an n-channel MOS power transistor T1, a second power switching element configured as an n-channel MOS transistor T2, and a first power switching element configured as an n-channel MOS transistor T2, and The first current measurement circuit R1, which is composed of a shunt resistor, is formed by wiring. The first terminal of the fi...
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The invention relates to a method for operating a capacitance adjusting means (PI) connected to an output terminal (A) of a device formed by means of: a first capacitor ( C1), which is arranged between the input terminal (E) of the device and the reference potential (GND); consists of four power switching elements (T1, T2, T3, T3) in parallel with the first capacitor (C1) The full bridge; the first coil (L1), which is wired between the bridge branches. In order to charge the capacitance adjustment component (PI), the first and third power switch elements (T1, T3) are firstly controlled to be turned on by the control circuit (Control), so that the current can flow from the first capacitor (C1) through the second A coil (L1) flows whereby energy is stored in the coil (L1). When the predetermined maximum current value is reached, the previously switched on first and third power switching elements (T1, T3) are turned off again, so that the magnetic energy stored in the first coil (L1) flows through the second The currents of the diode (D2) of the power switching element (T2) and of the diode (D4) of the fourth power switching element (T4) are curtailed, whereby the capacitive adjustment member (PI) is charged to the corresponding voltage and repeated if necessary The ground switches the first and the third power switching element ( T1 , T3 ) on and off to charge the capacitance adjustment component (PI) to a predetermined voltage.
Description
technical field [0001] The invention relates to a method for operating a capacitance adjustment component. Background technique [0002] In the case of modern internal combustion engines with fuel injection, the fuel injectors used should be able to respond with as little delay as possible. This requirement is met by capacitive adjustment components and here in particular capacitively acting piezoelectric elements. Such capacitive adjustment components represent a high capacitive load for the corresponding power supply circuit, which must be charged to a predetermined voltage within a very short period of time and then discharged again very quickly. Furthermore, the actuation and thus the charging must take place very precisely and reproducibly, so that defined injections can be achieved even with the smallest fuel quantities. To open the respective fuel injector, the capacitance adjustment component is charged to a certain charge and to close it is discharged again. [0...
Claims
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IPC IPC(8): H02N2/06H01L41/04H10N30/80
CPCF02D41/2096F02D2041/2058F02D2041/2072H02N2/067H02N2/06H10N30/80H02N2/062H10N30/802
Inventor D.埃茨勒W.施罗德
Owner VTESCO TECH GMBH