Electricity: electrical systems and devices – Electric charge generating or conducting means – With specific power supply
Patent
1989-12-08
1991-10-01
Pellinen, A. D.
Electricity: electrical systems and devices
Electric charge generating or conducting means
With specific power supply
55105, 55DIG30, 60275, B03C 372, B03C 368, F01N 302, H02H 1100
Patent
active
050539140
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a safety circuit arrangement for the high-voltage supply of an electrostatic filter, in particular of an electrostatic soot trap for diesel internal-combustion engines.
Electrostatic soot traps for diesel vehicles, also called soot filters, agglomerators or coagulators, are described, for example, in DE-A1-3 500 373 or DE-A1-3 424 196. In these prior art soot traps control devices with an output of up to 20 kV, 150 W and 10 mA are used for generating the high voltage required for creating the electrostatic field. A control device of this type for generating a high voltage is described, for example, in DE-A1-3 531 025. Owing to these control devices, there is a considerable risk potential for people in the case of improper use, or also with servicing and repair work on the vehicle, or in the case of an accident, so that preventative measures are necessary to avoid endangering people.
SUMMARY OF THE INVENTION
The object of the invention is a circuit arrangement for the high-voltage supply of an electrostatic filter in which the advantage that the high-voltage generation is switched off in the case of interruption of the ground connection between the control device and filter housing or filter housing and vehicle ground, with the resulting elimination of the risk of injury to people due to exposed components carrying high voltage.
In a first exemplary embodiment of the invention, the high-voltage generation is switched off by connecting the end of the shield of the high-voltage cable remote from the filter housing, or of the connecting line parallel thereto, via a resistor or a current source to a direct current potential, preferably ground, and by evaluating the voltage drop at the resistor or the current source as a switch-off criterion, for example for the active switching off of the power supply by a switching relay.
In a further embodiment of the invention, the end of the shield remote from the filter housing, or of the connecting line parallel thereto, serves as ground connection for the primary side of the high-voltage generator. If the ground connection of the primary side is interrupted, then the power supply to the primary side and hence the high-voltage generation is automatically stopped.
Since a shielded high-voltage cable is necessary anyway for carrying high voltage between high-voltage generator and filter for reasons of radio interference suppression, it is advantageous if the shield of the high-voltage cable is used as ground connection between high-voltage generator and filter. However, it is also possible to use a connecting line run parallel on the high-voltage cable, which connecting line is advantageously integrated in the high-voltage cable itself and runs, for example, in the outer sleeve thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is explained in the description below in greater detail with reference to the exemplary embodiments illustrated in the drawings, in which, in diagrammatic representation:
FIGS. 1 and 2 show, respectively, a first and a second embodiment of a circuit arrangement for the high-voltage supply of an electrostatic soot trap for a diesel vehicle,
FIG. 3 shows a cross-section of a high-voltage cable in the circuit arrangement according to FIGS. 1 or 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The electrostatic soot trap 10, also called a coagulator, or agglomerator or soot filter for a diesel vehicle illustrated diagrammatically in FIG. 1 is known from prior art as an example of an electrostatic filter. It consists of a preferably cylindrical housing 11, which has a connecting piece 12 for intake and a connecting piece 13 for discharging exhaust gas. An electrode 14 is built in isolated fashion in the interior of the housing 11. A high voltage is supplied to the electrode 14, while the housing 11 serves as a counter-electrode and is connected to vehicle ground 27. As a consequence, there is formed between the electrode 14 and the housing 11 an electrostatic field in which the particles cont
REFERENCES:
patent: 4011483 (1977-03-01), Meadows
patent: 4023073 (1977-05-01), Georgi
patent: 4075675 (1978-02-01), Burkett et al.
patent: 4338784 (1982-07-01), Liu et al.
patent: 4447844 (1984-05-01), Schossow et al.
patent: 4506260 (1985-03-01), Woodruff et al.
patent: 4860149 (1989-08-01), Johnston
Fischer Werner
Leonhard Rolf
Lucas Bernhard
Polach Wilhelm
Stahl Wilhelm
Osborn David
Pellinen A. D.
Robert & Bosch GmbH
Striker Michael J.
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