DE3932559A1 - RF noise mains filter unit for AC inverter system - has compact housing for RC elements with locators for connectors - Google Patents

Abstract

The a.c. inverter system has the mains supply filtered and converter to d.c. before being regenerated atsansa.c.ssupplys as an a.c. supply using an a.c. inverter stage. The output is processed through a filter circuit to remove high order harmonics. The filter has a module holder (8) with recesses (15) that provide locations for the filter capacitors (C1,C1') and resistors (R1). Connections are made using conductor strips (14) of copper. The holder has a form that is suited to various interconnection configurations. ADVANTAGE - Provides flexibility in connection.

Description

Technical field

The invention is based on a line filter the preamble of claim 1. The invention relates also use the line filter.

State of the art

With the preamble, the invention takes on a state of the Technology of line filters, as described in US Pat. No. 3,395,327 is known. In a HVDC system there are network-side self-tuning filters with suction circuits for several harmonies provided the grid frequency. For these filters there is one relatively complex control required.

Presentation of the invention

The invention as defined in claim 1 solves the task of specifying a line filter in which the Arrange filter components compactly and with little induction.

An advantage of the invention is the lower cost effort and space requirement of the line filter.  

According to an advantageous embodiment of the invention the conductor rails in a simple way for any type Mount the locking variants on the rail holder. Laterally and in connecting rails offset in depth enable their effort loose connection.

The filter components are protected in the module housing or housed in the rail holder. Is particularly effective the arrangement of the line filter or radio interference protection un indirectly at the entrance and / or exit of the device or the Investment.

Brief description of the drawings

The invention is based on an embodiment exemplified. It shows

Fig. 1 a filter circuit of a converter with DC clamping voltage intermediate circuit and AC-side network,

Fig. 2 is a front view of an assembly with line filters according to Fig. 1,

Fig. 3 is a sectional drawing of Fig. 2 and

Fig. 4 is a rear view of the assembly of FIG. 2.

Ways of Carrying Out the Invention

In Fig. 1 with (L 1 -L 3 ) 3 line-side input phase conductor of a rectifier ( 2 ) is referred to, which is connected via a DC link to an inverter ( 3 ). (L 1 ' -L 3' ) denote phase-side output phase conductors and (L 4 ' ) a neutral conductor of the inverter ( 3 ). ( 1 ) denotes a line or input filter of the converter ( 2 ) and ( 4 ) a line or output filter of the inverter ( 3 ). The DC voltage intermediate circuit with an intermediate circuit capacitor and a parallel resistor is protected by a battery ( 5 ) so that the converter can be used for an uninterruptible power supply. Current transformers are identified by ( 7 ).

The input filter ( 1 ) has, per input phase conductor (L 1 ) or (L 2 ) or (L 3 ), a parallel connection of a filter capacitor (C 1 ) or (C 2 ) or (C 3 ) and a filter wi the level (R 1 ) or (R 2 ) or (R 3 ), which are electrically connected in a common neutral conductor ( 9 ). This neutral point conductor ( 9 ) is connected to an earth rail or earth line (E) via a filter capacitor (C 4 ).

The output filter ( 4 ) is constructed in the same way as the input filter ( 1 ), with the conductors or the output phase conductors (L 1 ′ -L 3 ′ ) and the neutral conductor (L 4 ′ ) filter capacitors (C 1 ′ -C 4 ′ ) and filter resistors connected in parallel (R 1 ' -R 4' ) are assigned. The filter capacitors and resistors have a common Sternpunktlei ter ( 10 ), which is in operative connection with the earth line (E) via a filter capacitor (C 5 ' ).

The front view shown in Fig. 2 of the line filter (1) and (4) assembly containing shows in 3 superposed floors below an input part to the input filter (1), in the middle of an unspecified interest here bypass and above an output part with the Output filter ( 4 ). (S 1 ) and (S 1 ' ) denote flat, cross-sectionally rectangular conductor rails of the conductors (L 1 ) and (L 1' ) according to FIG. 1. With + screw connections on the current transformers ( 7 ) are designated.

Fig. 3 shows a sectional view of the assembly of Fig. 2 along a section line (AA). With ( 6 ) there is an Arre animal plate, which is connected to an assembly housing or a rail holder ( 8 ). The rail holder ( 8 ) has webs ( 11, 12 ) which delimit recesses ( 15 ) inside the rail holder. In the recesses ( 15 ), the filter capacitors (C 1 ) and (C 1 ' ) and cylindrical filter resistors (R 1 ) and (R 1' ) are housed or arranged with a cylinder half Zy, of which only the filter resistor (R 1 ) is indicated by dashed lines, which lies behind the filter capacitor (C 1 ). Half of the cylindri's filter resistor (R 1 ) protrudes from the recess ( 15 ) to the left. The reference number ( 14 ) denotes a stes conductor strip made of copper for electrical connection of the filter capacitors (C 1 , C 1 ' ) and the filter resistors (R 1 , R 1' ); it is angled at 90 ° with respect to the conductor rails (S 1 , S 1 ' ).

Fig. 4 shows a rear view of the assembly of Fig. 2, from the position of the filter capacitors (C 1 -C 4 , C 1 ' -C 5' ) and the filter resistors (R 1 -R 3 , R 1 ' -R 4 ' ) Can be seen. With ( 9 ) and ( 10 ) 2. conductor strips made of copper are designated, which serve as neutral point conductors and are attached to the webs ( 11 ) and ( 12 ) of the rail holder ( 8 ). The second conductor strips ( 9, 10 ) are spaced from the conductor rails (S 1 , S 1 ' ...) By the length of the cup-shaped filter capacitors (C 1 -C 3 , C 1' -C 4 ' ); they are perpendicular to these. With ( 13 ) angled electrical connecting links or coupling members for attaching the conductor rails (S 1 , S 1 ' ....) And the first conductor strips ( 14 ) are characterized by screws. The two conductor rails at the bottom left are intended for connecting the battery ( 5 ).

The rail holder ( 8 ) is constructed in such a way that the conductor or connecting rails can be easily connected for different connection variants. It is important that the line filters are arranged directly at the input and / or output of the respective device or converter, so that no radio interference is transmitted from this to the respective AC network (L 1 -L 3 , L 1 ' -L 3' ) .

Claims (9)

1. line filter, in particular for radio interference suppression, for at least one conductor to be suppressed (L 1 -L 3 , L 1 ' - L 4' ), which is held electrically insulated by a rail holder ( 8 ),

• a) with at least one filter component (C 1 -C 3 , R 1 -R 3 ; C 1 ′ -C 4 ′ , R 1 -R 4 ′ ) per conductor, which is operatively connected to this conductor, characterized in that
• b) that the rail holder ( 8 ) has a recess ( 15 ) at least in the region of the holder of the conductor,
• c) in which the at least one filter component is at least partially accommodated.

2. Line filter according to claim 1, characterized in

• a) that the conductor to be suppressed (L 1 -L 3 , L 1 ' -L 4' ) is designed at least in the connection area as a flat conductor rail (S 1 , S 1 ' ),
• b) which is connected via a first conductor strip ( 14 ) to the at least one filter component (C 1 -C 3 , R 1 -R 3 ; C 1 ' -C 4' , R 1 ' - R 4' ).

3. Line filter according to claim 2, characterized in

• a) that the first conductor strip ( 14 ) is angled by 90 ° with respect to the conductor rail (S 1 , S 1 ' ),
• b) that at least a second conduction band or a star point conductor ( 9, 10 ) is provided, which is spaced from the conductor rail and runs perpendicular to it at least in the connection area, and
• c) that the at least one filter component (C 1 -C 3 , R 1 - R 3 ; C 1 ' -C 4' , R 1 ' -R 4' ) directly between this 1. Lei terband ( 14 ) and the neutral conductor ( 9, 10 ) is connected.

4. Line filter according to one of claims 1 to 3, characterized in that the rail holder ( 8 ) consists of an electrically insulating plastic and at least one web ( 11, 12 ) which delimits the recess ( 15 ). 5. Line filter according to claim 4, characterized in that the web ( 11, 12 ) is a star point conductor ( 9, 10 ). 6. Line filter according to one of claims 1 to 5, characterized in

• a) that per conductor (L 1 -L 3 , L 1 ' -L 4' ) at least one condenser (C 1 -C 3 , C 1 ' -C 4' ) and
• b) in parallel with the at least one capacitor at least one resistor (R 1 -R 3 , R 1 ' -R 4' ) are provided as Fil terbauelemente.

7. Line filter according to claim 6, with at least 2 Entstö-resisting conductors (L 1 -L 3 , L 1 ' -L 4' ), characterized in that

• a) that these conductors each have the parallel connection of at least one capacitor (C 1 -C 3 , C 1 ' -C 4' ) and at least one resistor (R 1 -R 3 , R 1 ' -R 4' ) with a common Neutral point conductors ( 9, 10 ) are connected,
• b) which is operatively connected to at least one capacitor (C 4 , C 5 ' ) with an earth line (E).

8. Line filter according to claim 7, characterized in that the conductor rails (S 1 , S 1 ' ) different conductors (L 1 -L 3 , L 1' -L 4 ' ) are offset laterally and in depth against each other. 9. Use of a line filter according to one of claims 1 to 7 directly at the AC input and / or output of a device to be suppressed, esp a converter for uninterruptible power care.