EMC cooling device

Abstract

The present disclosure relates to a cooling apparatus (1) comprising a metal and/or electrically conductive EMC enclosure (2) and a converter (E.sub.1) and also a plurality of electrically operated units (E.sub.2, . . . , E.sub.n) within the EMC enclosure (2) which are designed to influence a local temperature in at least one region (30, 31) inside or outside the EMC enclosure (2), wherein the converter (E.sub.1) directly supplies at least one or more of the units (E.sub.2, . . . , E.sub.n) with a respective supply voltage, and wherein the converter (E.sub.1) and the units (E.sub.2, . . . , E.sub.n) are each designed such that the line-bound and/or field-bound interference (S.sub.xy) which is specifically generated by this unit during operation of the cooling apparatus (1) is compensated for by a line-bound and/or field-bound interference (S.sub.xy) of at least one of the respectively other units (E.sub.1, . . . , E.sub.n) partially or completely in terms of its respective interference level (P.sub.n).

Claims

1. A cooling apparatus comprising a metallic and/or electrically conductive EMC enclosure and a converter (E.sub.1) and also a plurality of electrically operated units (E.sub.2, . . . , E.sub.n) within the EMC enclosure, which is designed to influence a local temperature in at least one region inside or outside the EMC enclosure, wherein the converter (E.sub.1) directly supplies one or more of the plurality of electrically operated units (E.sub.2, . . . , E.sub.n) with a respective supply voltage, and wherein the converter (E.sub.1) and the plurality of electrically operated units (E.sub.2, . . . , E.sub.n) are each designed such that the line-bound and/or field-bound interference (S.sub.xy) which is specifically generated by at least one of the plurality of electrically operated units during operation of the cooling apparatus is compensated for by a line-bound and/or field-bound interference (S.sub.xy) of at least one of the respective other plurality of electrically operated units (E.sub.1, . . . , E.sub.n) partially or completely in terms of its respective interference level (P.sub.n), characterized in that the cooling apparatus is designed so that the at least one of the plurality of electrically operated units (E.sub.2, . . . , E.sub.n) is mounted reversibly interchangeably with another of the plurality of electrically operated units (E.sub.2, . . . , E.sub.n) in the cooling apparatus and the respective at least one of the plurality of electrically operated units (E.sub.2, . . . , E.sub.n) is supplied directly with a supply voltage from a DC intermediate circuit (GZ) of the converter (E.sub.1).

2. The cooling apparatus according to claim 1, wherein at least one or more of the plurality of electrically operated units (E.sub.2, . . . , E.sub.n) are fans.

3. The cooling apparatus according to claim 2, wherein the fans are internal and external fans.

4. The cooling apparatus according to claim 1, wherein at least one of the plurality of electrically operated units (E.sub.2, . . . , E.sub.n) is a refrigerating compressor.

5. The cooling apparatus according to claim 4, wherein the at least one refrigerating compressor is supplied by a supply voltage of an inverter (W) of the converter (E.sub.1).

6. The cooling apparatus according to claim 1, wherein at least the line-bound and/or field-bound interference (S.sub.xy) with the highest interference level (Pn) is compensated by at least one line-bound and/or field-bound interference (S.sub.xy) of one of the plurality of electrically operated units (E.sub.2, . . . , E.sub.n) or the converter (E.sub.1) such that the resulting interference level (P.sub.n′) is below a specific interference immunity level (P.sub.max) of the one or the respective other plurality of electrically operated units (E.sub.2, . . . , E.sub.n).

7. The cooling apparatus according to claim 1, wherein the converter (E.sub.1) and the units (E.sub.2, . . . , E.sub.n) are chosen such that one or more of the respective interference levels (Pn) of the line-bound and/or or field-bound interferences (S.sub.xy) which are generated by the converter (E.sub.1) or the plurality of electrically operated units (E.sub.2, . . . , E.sub.n) in an isolated single operation, are compensated in the configuration implemented in the cooling apparatus below the interference immunity level (P.sub.max, n) of that unit which has the lowest interference immunity level (P.sub.max, n) compared to the other units.

8. The cooling apparatus according to claim 1, wherein the compensation of the line-bound and/or field-bound interferences (S.sub.xy) takes place by means of a destructive interference or superposition.

9. The cooling apparatus according to claim 1, wherein at least one control apparatus (S) is provided and configured to change the line-bound and/or field-bound interferences (S.sub.xy) in the operation of the plurality of electrically operated units of the cooling apparatus in terms of their interference characteristics so that an interference compensation below a defined interference level takes place by the superposition of two or more of the changed line-bound and/or field-bound interferences (S.sub.xy).

10. The cooling apparatus according to claim 1, wherein a plurality of all the plurality of electrically operated units (E.sub.2, . . . , E.sub.n) are designed without power supply and are connected only to the converter (E1) for voltage supply.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Other advantageous developments of the present disclosure are characterized in the dependent claims or are shown in more detail below together with the description of the preferred embodiment of the present disclosure with reference to the figures:

(2) FIG. 1 shows a schematic view of a cooling apparatus according to the present disclosure and

(3) FIG. 2 shows a schematic representation of an interference field compensation.

DETAILED DESCRIPTION

(4) In the following, the present disclosure will be explained in more detail with reference to an embodiment with reference to FIGS. 1 and 2, wherein like reference numerals refer to the same functional and/or structural features.

(5) FIG. 1 shows an exemplary embodiment of a cooling apparatus 1 comprising a metallic and therefore conductive EMC enclosure 2. Enclosure 2 accommodates a frequency converter E.sub.1 and several electrically operated units E.sub.2, E.sub.3, E.sub.4, E.sub.5, which will be described in more detail below. In operation of cooling apparatus 1, for example, the frequency converter E.sub.1 generates a specific field-bound interference S.sub.xy, wherein xy here represents a pairing each of the interference source and the interference sink.

(6) This means at xy=12 that, e. g., an interference S.sub.12 is such an EMC interference that acts on the unit E.sub.2 from the frequency converter E.sub.1.

(7) In the present example, the frequency converter E.sub.1 comprises a rectifier G, a DC intermediate circuit GZ and an inverter W. The DC intermediate circuit GZ is equipped with a power factor correction filter PFC.

(8) The units E.sub.3, E.sub.4, represent fans, namely an internal fan E.sub.3 and an external fan E.sub.4. The unit E.sub.5 is representative of an example of another electrically operated component such as a heater, a condensate evaporation or the like.

(9) Unit E.sub.2 represents a compressor which is supplied by a supply voltage of the inverter W of the frequency converter E.sub.1.

(10) The DC intermediate circuit GZ has a voltage tap 4 for each of the units E.sub.3, E.sub.4, E.sub.5. Cooling apparatus 1 is designed so that the fans E.sub.3, E.sub.4 are mounted in the cooling apparatus reversibly exchangeably by another mounting compatible fan.

(11) The frequency converter E.sub.1 and the units E.sub.2, E.sub.3, E.sub.4, E.sub.5 are in each case designed so that the line-bound and/or field-bound interference S.sub.xy which is specifically generated by the respective component during operation of cooling apparatus 1 is compensated for by a line-bound and/or field-bound interference S.sub.xy of at least one of the respectively other components partially or completely in terms of their respective interference level P.sub.n, as shown schematically in FIG. 2.

(12) FIG. 2 shows an exemplary interference S13 (shown for reasons of simplification illustrated as a square wave signal) of frequency converter E.sub.1 with a first interference level P1 and an interference S31 of the internal fan E.sub.3 with an interference level P3 which compensates for this interference (for reasons of simplification illustrated as a square wave signal). By destructive interference of the interference signals S13 and S31, as shown in the lower view of FIG. 2, the interference is compensated for except for the difference in the magnitudes of the interference level maxima P1, P3, wherein the interference immunity level P.sub.max, 3 of the internal fan E.sub.3 has the lowest interference immunity level compared to the other units. Accordingly, the interference level after the compensation is lower than the interference immunity level P.sub.max, 3 of the internal fan E.sub.3.

(13) Optionally, furthermore, a control device S can be provided in order to change the line-bound and/or field-bound interferences S.sub.xy during operation of cooling apparatus 1 in terms of its interference characteristics so that an interference compensation below a defined interference level takes place by the superposition of two or more of the changed line-bound and/or field-bound interferences S.sub.xy.

(14) The present disclosure is not limited in its embodiments to the above-mentioned preferred exemplary embodiments. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different embodiments.