JP6584860B2 - Synthesizer and transmitter for digital amplitude modulation for transmitter - Google Patents

Description

  Embodiments described herein relate generally to a combining unit and a digital amplitude modulation apparatus for a transmitter.

For example, a digital amplitude modulation device is used for a transmitter for medium wave broadcasting. The digital amplitude modulation device includes a combining unit that combines outputs of a plurality of power amplifiers arranged in parallel. The digital amplitude modulation device generates an AM wave (Amplitude Modulation Wave) by combining the outputs of the plurality of power amplifiers in the combining unit, and transmits the AM wave to the broadcast service area.
By the way, the above composition part has the transformer containing the primary side coil wound around the toroidal type core, and the secondary side coil which passes through the inside of the toroidal type core. The synthesizer changes the output power of the power amplifier by changing the turns ratio of the transformer. For this reason, it is desirable that the combining unit can easily change the number of windings of the transformer. However, in the conventional synthesis unit, it may be difficult to change the number of windings of the transformer.

JP 2014-216848 A

Medium-wave digital modulation transmitter and its operation, broadcasting technology, April 1991 issue (PP.348, Fig. 8 etc.)

  The problem to be solved by the present invention is to provide a transmitter synthesizing unit and a digital amplitude modulation device capable of easily changing the number of windings of a transformer.

The combining unit for the transmitter according to the embodiment includes a plurality of toroidal cores, a first support member, a second support member, and a third support member. The plurality of toroidal cores are wound with a primary winding of a transformer, and a secondary winding of the transformer passes through the inside, and is arranged in the axial direction of the central axis. The first support member is located on one side of the plurality of toroidal cores in the axial direction. The second support member is located on the opposite side of the plurality of toroidal cores from the first support member, and presses the plurality of toroidal cores toward the first support member. The plurality of third support members are arranged separately in a circumferential direction of the plurality of toroidal cores, and support the plurality of toroidal cores from outside in the radial direction of the plurality of toroidal cores. At least one of the plurality of third support members is movable along the radial direction with respect to the first support member. The first support member and the second support member are connected by the plurality of third support members. The first support member has a first hole extending along the radial direction. At least one of the plurality of third support members is inserted into the first hole, and is movable along the radial direction inside the first hole.

1 is a block diagram showing a configuration of a digital amplitude modulation apparatus according to a first embodiment. The block diagram which shows the structure of the synthetic | combination part of 1st Embodiment. The top view which shows the synthetic | combination part of 1st Embodiment. Sectional drawing which follows the F4-F4 line | wire of the synthetic | combination part shown in FIG. The figure which shows the synthetic | combination part of 1st Embodiment. The figure which shows the synthetic | combination part of the 1st modification of 1st Embodiment. The figure which shows the synthetic | combination part of the 2nd modification of 1st Embodiment. The figure which shows the synthetic | combination part of the 3rd modification of 1st Embodiment. The top view which shows the synthetic | combination part of 2nd Embodiment. Sectional drawing which follows the F10-F10 line | wire of the synthetic | combination part shown in FIG.

  Hereinafter, a transmitter synthesizing unit and a digital amplitude modulation apparatus according to an embodiment will be described with reference to the drawings. In the following description, the same reference numerals are given to configurations having the same or similar functions. And the description which overlaps those structures may be abbreviate | omitted.

(First embodiment)
With reference to FIGS. 1 to 5, the transmitter synthesizing unit 15 and the digital amplitude modulation apparatus 1 according to the first embodiment will be described.
First, the digital amplitude modulation device 1 will be described. The digital amplitude modulation apparatus 1 according to the present embodiment is used, for example, in a transmission apparatus for medium wave broadcasting.

FIG. 1 is a block diagram showing the configuration of the digital amplitude modulation apparatus 1.
As shown in FIG. 1, the digital amplitude modulation apparatus 1 includes a carrier signal input terminal 11, an audio signal input terminal 12, a control unit (control circuit) 13, a power amplification unit 14, a synthesis unit 15, a filter unit 16, and a signal output. It has an end 17.

A carrier signal as a transmission signal is input to the carrier signal input terminal 11. The carrier signal input to the carrier signal input terminal 11 is supplied to a power amplifier (PA) 14 via the controller 13.
The power amplifying unit 14 includes, for example, n (n is an arbitrary natural number) power amplifiers 141 to 14n. The power amplifiers 141 to 14n are arranged in parallel. The carrier signal supplied to the power amplifier 14 is distributed and supplied to the plurality of power amplifiers 141 to 14n. Each of the power amplifiers 141 to 14n is turned on = driving state or turned off = stopped state according to the control of the control unit 13. Each of the power amplifiers 141 to 14n outputs an amplified carrier signal in an on state.

  The combining unit 15 combines the carrier signals amplified by the power amplifiers 141 to 14n. That is, the synthesizer 15 amplifies the carrier signal to a preset desired level while changing the number of the power amplifiers 141 to 14n. The filter unit 16 suppresses unnecessary components included in the combined signal by filtering the combined signal combined by the combining unit 15. The carrier signal synthesized by the synthesizing unit 15 is filtered by the filter unit 16 and then output from the output signal terminal 17 via a measuring unit (not shown) as an amplitude-modulated RF band broadcast wave (AM wave). . A transmission antenna (not shown) is connected to the end of the output signal terminal 17. In addition, a matching circuit, a filter, a rejector, a trap circuit, and the like are inserted between the signal output terminal 17 and the transmission antenna.

  On the other hand, an audio signal (modulated signal) is input to the audio signal input terminal 12. The audio signal input to the audio signal input terminal 12 is input to the control unit 13. The control unit 13 controls the on / off state of each of the power amplifiers 141 to 14n based on the on / off control signal and the phase difference of the carrier signal according to the voltage amplitude of the input audio signal.

Next, the synthesis unit 15 will be described.
FIG. 2 is a block diagram illustrating a configuration of the synthesis unit 15.
As shown in FIG. 2, the combining unit 15 includes n transformers 201 to 20n corresponding to the number of power amplifiers. Hereinafter, the plurality of transformers 201 to 20n are simply referred to as “transformer 200” unless it is particularly necessary to distinguish between them. Each transformer 200 includes a primary side winding 21 and a secondary side winding 22. In the figure, power amplifiers 141, 142, 143, and 14n and transformers 201, 202, 203, and 20n are shown as representatives.

  Primary windings 21 of transformers 201 to 20n are connected to output terminals of power amplifiers 141 to 14n. The secondary windings 22 of the transformers 201 to 20n are connected in series with each other to form one secondary winding 22. One end of the secondary winding 22 is directly grounded or grounded through a coil, a capacitor, a resistor, or a combination thereof. On the other hand, the other end of the secondary winding 22 forms a combined output end. This combined output terminal is electrically connected to the filter unit 16.

  With the configuration as described above, when the carrier signal amplified by any of the power amplifiers 141 to 14n is added to the primary side winding 21 in the synthesizer 15, the carrier signal is sent to the secondary side winding 22. Output and synthesize. This combined output is output to the filter unit 16.

FIG. 3 is a plan view illustrating an example of a specific configuration of the synthesis unit 15 of the present embodiment.
As shown in FIG. 3, the combining unit 15 includes a first combining unit (lower combining unit in FIG. 3) 15a and a second combining unit (upper combining unit in FIG. 3) 15b. The configuration of the first synthesis unit 15a and the configuration of the second synthesis unit 15b are substantially the same. Therefore, in the following, the configuration of the first synthesis unit 15a will be described in detail.

  The first synthesis unit 15 a includes a plurality of toroidal cores 31 and a support mechanism 32 that supports the plurality of toroidal cores 31.

  As shown in FIG. 3, the plurality of toroidal cores 31 are arranged in a line along the axial direction of the central axis C of the toroidal core 31. Each toroidal core 31 is, for example, a Mn—Zn ferrite core.

FIG. 4 is a cross-sectional view taken along line F4-F4 of the synthesis unit 15 shown in FIG.
As shown in FIG. 4, a through hole 31 h is provided in the center of the toroidal core 31. The through hole 31 h penetrates the toroidal core 31 along the axial direction of the central axis C of the toroidal core 31. Thereby, the toroidal core 31 is formed in a ring shape. In addition, the "ring shape" as used in this application widely means the shape by which the through-hole was provided in the center part.

  A primary winding 21 of the transformer 200 is wound around each toroidal core 31. More specifically, one primary winding 21 is provided corresponding to one toroidal core 31. The primary winding 21 is wound around the toroidal core 31 to which the primary winding 21 corresponds a plurality of times. Note that the number of turns of the primary winding 21 with respect to the toroidal core 31 may be different for each of the plurality of toroidal cores 31. For this reason, the outer shape of the toroidal core 31 including the primary winding 21 may differ depending on each toroidal core 31.

  On the other hand, as shown in FIG. 3, the secondary winding 22 continuously passes through the inside of the plurality of toroidal cores 31 (that is, the through holes 31 h). Thus, in the present embodiment, a serial addition type combining unit 15 is formed. For example, the secondary winding 22 passes through the inside and outside of the plurality of toroidal cores 31 a plurality of times. In the present embodiment, the secondary winding 22 alternately passes through the inside of the toroidal core 31 of the first synthesis unit 15a and the inside of the toroidal core 31 of the second synthesis unit 15b. Thus, one serial addition type combining unit 15 is formed by the first combining unit 15a and the second combining unit 15b.

  Here, the + Z direction, the −Z direction, the R direction, and the θ direction are defined. The + Z direction and the −Z direction are directions along the axial direction of the central axis C of the toroidal core 31 (that is, the through direction of the through hole 31h). The −Z direction is the opposite direction to the + Z direction. The R direction is a radial direction of the toroidal core 31 and is a direction away from the central axis C. The R direction is a direction that intersects (for example, substantially orthogonal) to the + Z direction. The θ direction (see FIG. 4) is a circumferential direction of the toroidal core 31 and is a direction rotating around the central axis C. The θ direction is a direction that intersects (for example, substantially orthogonal to) the + Z direction and the R direction.

  As shown in FIG. 3, in the present embodiment, the plurality of toroidal cores 31 are arranged in the −Z direction. As used herein, “packed arrangement” means that there is a substantial gap between a plurality of toroidal cores 31 (strictly speaking, between primary windings 21 wound around the toroidal cores 31). This means that the position of each toroidal core 31 is defined by the toroidal core 31 located next to it. For example, the primary side winding 21 of each toroidal core 31 is in contact with the primary side winding 21 of the toroidal core 31 located adjacent thereto. An insulating sheet that electrically isolates the primary windings 21 may be sandwiched between the primary windings 21 of each toroidal core 31.

Next, the support mechanism 32 that supports the plurality of toroidal cores 31 will be described.
The support mechanism 32 includes a first presser plate 41, a second presser plate 42, and a plurality of support bars 43. For example, the first presser plate 41, the second presser plate 42, and the plurality of support bars 43 are formed of a material having an insulating property (electrical insulating property).

  The first pressing plate 41 is an example of each of “first member”, “first support plate”, and “first support member”. As shown in FIG. 3, the first pressing plate 41 is located on one side (−Z direction side) of the plurality of toroidal cores 31 in the axial direction of the toroidal core 31. In other words, the first pressing plate 41 is aligned with the plurality of toroidal cores 31 in the −Z direction. The first pressing plate 41 faces the plurality of toroidal cores 31 in the + Z direction. The first pressing plate 41 is a rectangular plate material having a surface substantially parallel to the R direction. The first pressing plate 41 has a larger outer shape than the toroidal core 31 in the R direction. The first presser plate 41 contacts the toroidal core 31 located at the end among the plurality of toroidal cores 31 from the + Z direction. In addition, the phrase “in contact with the toroidal core 31” in the present application includes a case in which the primary side winding 21 wound around the toroidal core 31 is in contact.

The first pressing plate 41 supports the plurality of toroidal cores 31 in the + Z direction. The term “support” as used in the present application also includes indirectly supporting another member in contact with one member by contacting the member. In the present embodiment, the first pressing plate 41 is arranged so as to be packed with respect to the toroidal core 31 by supporting one toroidal core 31 positioned at the end among the plurality of toroidal cores 31. A plurality of toroidal cores 31 are supported.
Further, the first pressing plate 41 is provided with a through hole 41h through which the secondary winding 22 passes along the + Z direction (see FIG. 5).

The second presser plate 42 is an example of each of “second member”, “second support plate”, and “second support member”. As shown in FIG. 3, the second presser plate 42 is located on the opposite side of the first presser plate 41 with respect to the plurality of toroidal cores 31. That is, the second pressing plate 42 faces the plurality of toroidal cores 31 in the −Z direction. For example, the second presser plate 42 has substantially the same outer shape as the first presser plate 41. The second presser plate 42 contacts the toroidal core 31 positioned at the end among the plurality of toroidal cores 31 from the −Z direction. The second presser plate 42 presses the plurality of toroidal cores 31 toward the first presser plate 41. Thereby, the second pressing plate 42 supports the plurality of toroidal cores 31 in the −Z direction. In other words, the plurality of toroidal cores 31 are sandwiched and held between the first presser plate 41 and the second presser plate 42. As a result, the positions of the plurality of toroidal cores 31 in the Z direction and the −Z direction are fixed.
Further, the second presser plate 42 is provided with a through hole 42h through which the secondary winding 22 passes along the + Z direction (see FIG. 5).

  Each of the plurality of support bars 43 is an example of a “third member” and a “third support member”. As shown in FIG. 3, each of the plurality of support bars 43 extends in the + Z direction and connects the first presser plate 41 and the second presser plate 42. More specifically, each support bar 43 passes through the first presser plate 41 and extends to the −Z direction side from the first presser plate 41. Each support rod 43 extends through the second presser plate 42 in the + Z direction from the second presser plate 42. The connection structure between each support bar 43 and the first presser plate 41 and the second presser plate 42 will be described in detail later.

  As shown in FIG. 4, in the present embodiment, three support bars 43 are provided as the plurality of support bars 43. The number of support bars 43 is not limited to the above, and the number of support bars 43 may be four or more, for example. The plurality of support bars 43 are disposed on the outer peripheral side of the toroidal core 31. The plurality of support bars 43 are arranged separately around the toroidal core 31 in the θ direction. The plurality of support bars 43 are arranged, for example, at equal intervals in the θ direction. The intervals between the support rods 43 may not be equal.

  The plurality of support bars 43 support the plurality of toroidal cores 31 from the outside of the toroidal core 31 in the R direction. More specifically, each support bar 43 supports the outer peripheral surfaces 31a of the plurality of toroidal cores 31 from the outside in the R direction. The plurality of support bars 43 support the toroidal core 31 from a plurality of different directions. Thereby, the position of the R direction of the some toroidal core 31 is fixed. That is, the plurality of toroidal cores 31 are fixed so as to be sandwiched between the plurality of support bars 43. As used herein, “supporting the outer peripheral surface 31 a of the toroidal core 31” means supporting the outer peripheral surface 31 a of the toroidal core 31 by contacting the primary winding 21 wound around the toroidal core 31. Including cases.

  Each support bar 43 does not need to directly support the outer peripheral surface 31a of all the toroidal cores 31, and may support the outer peripheral surface 31a of at least one toroidal core 31. That is, the outer diameter of the toroidal core 31 differs depending on the number of turns of the primary side winding 21. For this reason, each support rod 43 supports the outer peripheral surface 31a of the toroidal core 31 having the largest number of turns of the primary winding 21, for example. In this case, the remaining toroidal core 31 is supported by a frictional force generated between the toroidal core 31 supported by the support rod 43. For example, when the synthetic | combination part 15 is arrange | positioned sideways, the toroidal type core 31 may just get on the support rod 43 located below. That is, the toroidal core 31 may not be in contact with the support rod 43 positioned above.

  As shown in FIG. 4, the cross section (cross section along the R direction) of the support rod 43 is, for example, circular. The cross-sectional shape of the support bar 43 is not limited to the above example. The cross section of the support bar 43 may be polygonal or other shapes.

  In the present embodiment, each support bar 43 is in the direction approaching the toroidal core 31 and the direction away from the toroidal core 31 along the R direction with respect to the first presser plate 41 and the second presser plate 42. It is provided so as to be movable. Therefore, the movable mechanism of the support bar 43 that enables the above movement will be described below.

FIG. 5 shows a cross section of the first presser plate 41 and a cross section of the second presser plate 42.
As shown in FIG. 5, the first presser plate 41 has a plurality of first holes 41 a at positions corresponding to the support rods 43. The first hole 41a is a through hole that penetrates the first pressing plate 41 in the + Z direction. The first hole 41a is a long hole extending along the R direction. Each support bar 43 is inserted into the first hole 41a. Each support bar 43 is movable along the R direction inside the first hole 41a (see arrow A in FIG. 5). Each support rod 43 is movable along the R direction, for example, guided by the inner peripheral surface of the first hole 41a extending in the R direction.

  Similarly, the second presser plate 42 has a plurality of second holes 42 a at positions corresponding to the support rods 43. The second hole 42a is a through hole that penetrates the second pressing plate 42 in the -Z direction. The second hole 42a is a long hole extending along the R direction. Each support bar 43 is inserted into the second hole 42a. Each support bar 43 is movable along the R direction inside the second hole 42a (see arrow B in FIG. 5). Each support rod 43 is movable along the R direction, for example, guided by the inner peripheral surface of the second hole 42a extending in the R direction.

  Further, as shown in FIG. 5, the second presser plate 42 is movable along a plurality of support bars 43 in a direction approaching the first presser plate 41 and a direction away from the first presser plate 41 ( (See arrow C in FIG. 5). That is, the second presser plate 42 can move along the support bar 43 by passing the support bar 43 through the second hole 42a. In the present embodiment, the second presser plate 42 is detachably attached to the plurality of support bars 43. That is, the second presser plate 42 can be removed from the end portion of the support bar 43 in the −Z direction by moving in a direction away from the first presser plate 41, and in a direction approaching the first presser plate 41. By being moved, the support rod 43 can be attached to the support rod 43 from the end in the −Z direction. The second presser plate 42 is fixed to the plurality of support bars 43 at positions where the plurality of toroidal cores 31 are pressed toward the first presser plate 41. That is, the second presser plate 42 is moved to the vicinity of the first presser plate 41 until there is no gap between the second presser plate 42, the plurality of toroidal cores 31, and the first presser plate 41. Thus, it is fixed to the support rod 43.

Next, the fixing structure of the first presser plate 41 and the second presser plate 42 will be described.
As shown in FIG. 5, screws (threads) 45 are formed on the outer peripheral surface of each support bar 43. For example, the screw 45 is provided over the entire length of each support bar 43. The screws 45 may be provided only at both ends of each support rod 43 with which a first fixing member 51 and a second fixing member 52 described later are engaged.

  The support mechanism 32 of this embodiment includes a first fixing member 51 that is screwed to the screw 45 of the support bar 43 to fix the first presser plate 41, and a second presser plate that is screwed to the screw 45 of the support bar 43. And a second fixing member 52 for fixing 42.

  As shown in FIG. 5, the first fixing member 51 is, for example, a nut. The first fixing member 51 is located on the opposite side to the plurality of toroidal cores 31 with respect to the first pressing plate 41. The first fixing member 51 is screwed into the screw 45 of the support bar 43 and is in contact with the first presser plate 41. When the first fixing member 51 is attached to the support bar 43, the first presser plate 41 cannot be detached from the support bar 43 in the −Z direction. The first fixing member 51 is fastened toward the + Z direction with respect to the first pressing plate 41. Thereby, the first fixing member 51 applies a force toward the plurality of toroidal cores 31 to the first presser plate 41. Thereby, the first fixing member 51 fixes the support rod 43 and the first presser plate 41.

  Similarly, the second fixing member 52 is, for example, a nut. The second fixing member 52 is located on the opposite side to the plurality of toroidal cores 31 with respect to the second pressing plate 42. The second fixing member 52 is screwed into the screw 45 of the support bar 43 and is in contact with the second presser plate 42. When the second fixing member 52 is attached to the support bar 43, the second presser plate 42 cannot be detached from the support bar 43 in the + Z direction. The second fixing member 52 is tightened toward the −Z direction with respect to the second pressing plate 42. Thereby, the second fixing member 52 applies a force toward the plurality of toroidal cores 31 to the second presser plate 42. Thereby, the second fixing member 52 fixes the support bar 43 and the second presser plate 42.

  According to the above configuration, the first fixing member 51 receives a reaction force from the first pressing plate 41. The second fixing member 52 receives a reaction force from the second presser plate 42. When the first fixing member 51 and the second fixing member 52 receive a reaction force from the first pressing plate 41 and the second pressing plate 42, the frictional force between the first fixing member 51 and the first pressing plate 41, and the first 2 The frictional force between the fixing member 52 and the second pressing plate 42 is increased. As a result, the support bar 43 does not move along the R direction. That is, the first fixing member 51 and the second fixing member 52 fix the position of the support bar 43 in the R direction by the reaction force received from the first pressing plate 41 and the second pressing plate 42.

Next, an example of a method for assembling the synthesis unit 15 according to the present embodiment will be described.
First, each support bar 43 is inserted into the first hole 41 a of the first presser plate 41. The first fixing member 51 is attached to the support bar 43. As a result, the position of the first presser plate 41 is determined.

  On the other hand, the toroidal core 31 is prepared in a state in which the primary winding 21 is wound. After the first presser plate 41 and the support bar 43 are connected, the plurality of toroidal cores 31 are accommodated between the plurality of support bars 43. That is, a plurality of toroidal cores 31 are arranged in a row with respect to the first presser plate 41. For example, the synthesis unit 15 is assembled with the + Z direction facing upward. In this case, the first presser plate 41 is positioned below the combining unit 15. The plurality of toroidal cores 31 are accommodated between the plurality of support bars 43 by being stacked on the first pressing plate 41. At this time, the plurality of support bars 43 are escaped to positions outside the outer diameter of the toroidal core 31 in the R direction. For this reason, the toroidal core 31 is smoothly accommodated between the plurality of support bars 43.

  After the plurality of toroidal cores 31 are packed and arranged with respect to the first presser plate 41, the second presser plate 42 is attached to the support bar 43. Specifically, the second presser plate 42 is attached to the support bar 43 by passing the support bar 43 through the second hole 42 a of the second presser plate 42. At this time, the second presser plate 42 is movable along the support bar 43. For example, the second pressing plate 42 is placed on a plurality of toroidal cores 31 stacked in the vertical direction. As a result, the second presser plate 42 is packed and arranged with respect to the plurality of toroidal cores 31.

  For example, after the second presser plate 42 is attached to the support bar 43, the plurality of support bars 43 are moved inward in the R direction. Each support bar 43 is moved to a position in contact with at least one toroidal core 31. As each support bar 43 moves inward in the R direction, the position of each toroidal core 31 is fixed by being sandwiched between the plurality of support bars 43. The support bar 43 may be moved before the second presser plate 42 is attached to the support bar 43.

  Next, the second fixing member 52 is attached to the support rod 43. Then, by rotating at least one of the first fixing member 51 and the second fixing member 52 in the tightening direction, the first pressing plate 41 and the second pressing plate 42 are fixed. Moreover, the position of each support rod 43 in the R direction is fixed by rotating in a direction in which at least one of the first fixing member 51 and the second fixing member 52 is tightened. For example, after the positions of the plurality of toroidal cores 31 are fixed, the secondary winding 22 is continuously passed through the inside of the plurality of toroidal cores 31. Thereby, the synthetic | combination part 15 is formed.

  In addition, the assembly method of the synthetic | combination part 15 is not restricted to the said example. For example, the first presser plate 41 and the second presser plate 42 may be attached to the support bar 43 first, and then the toroidal core 31 may be inserted between the support bars 43. In this case, when the toroidal core 31 is inserted, the support bar 43 is escaped to a position outside the outer diameter of the toroidal core 31 in the R direction. Then, after the toroidal core 31 is inserted between the plurality of support bars 43, the support bar 43 is moved inward in the R direction, whereby the toroidal core 31 is fixed.

Next, the attachment structure of the synthetic | combination part 15 with respect to the housing | casing 60 which accommodates the synthetic | combination part 15 is demonstrated.
As shown in FIG. 3, the digital amplitude modulation device 1 includes a housing 60 that houses the synthesis unit 15. The combining unit 15 is fixed to the inner surface of the housing 60. More specifically, the synthesis unit 15 is attached to the housing 60 by a pair of first attachment members 61A and 61B and a pair of second attachment members 62A and 62B.

  One end of the first mounting member 61A is fixed to the first pressing plate 41 of the first synthesis unit 15a on the outer side of the plurality of support bars 43 when viewed from the central axis C of the toroidal core 31 in the R direction. The The other end of the first attachment member 61 </ b> A is fixed to the inner surface of the housing 60. Similarly, one end portion of the other first mounting member 61B is outside the plurality of support bars 43 as viewed from the central axis C of the toroidal core 31 in the R direction, and the second presser plate 42 of the first synthesis unit 15a. Fixed to. The other end of the first attachment member 61B is fixed to the inner surface of the housing 60. For example, the first attachment members 61A and 61B are fixed to the housing 60, the first presser plate 41, and the second presser plate 42 by fastening members such as screws.

In addition, one end of one second mounting member 62A is located on the first presser plate 41 of the second synthesis unit 15b on the outer side of the plurality of support bars 43 when viewed from the central axis C of the toroidal core 31 in the R direction. Fixed. The other end of the second attachment member 62A is fixed to the inner surface of the housing 60. Similarly, one end portion of the other second mounting member 62B is outside the plurality of support bars 43 when viewed from the central axis C of the toroidal core 31 in the R direction, and the second presser plate 42 of the second synthesis unit 15b. Fixed to. The other end of the second attachment member 62B is fixed to the inner surface of the housing 60. For example, the second attachment members 62A and 62B are fixed to the housing 60, the first presser plate 41, and the second presser plate 42 by fastening members such as screws.
Thereby, the 1st synthetic | combination unit 15a and the 2nd synthetic | combination unit 15b are fixed to the housing | casing 60. FIG.

  According to such a configuration, the number of windings of the transformer 200 can be easily changed, and the synthesis unit 15 capable of improving workability can be provided. That is, the turns ratio of the transformer 200 may be changed according to the desired secondary voltage. Note that the turn ratio of the transformer 200 is changed by changing the number of turns of the primary winding 21 wound around the toroidal core 31, for example. Further, the number of toroidal cores 31 may be changed in order to obtain a desired secondary voltage.

  Here, as one comparative example, consider a support member that supports a plurality of toroidal cores spaced apart from each other and is provided with a groove to which each toroidal core is attached. Here, for example, when the number of turns of the primary winding is changed, the thickness of the toroidal core including the primary winding changes, and the toroidal core may not fit in the groove of the support member. . That is, when the number of turns of the primary winding is changed in the support member as described above, the groove shape may need to be changed according to the number of turns of the primary winding. The number of toroidal cores that can be supported by the support member as described above is limited by the number of grooves provided in advance.

  As another comparative example, consider a support mechanism in which a support plate for holding a toroidal core is provided, and a groove to which the support plate is attached is provided in the support member. According to such a support mechanism, if the change in the number of turns of the primary winding is not more than a certain amount, the change in the number of turns can be performed smoothly. However, when the change in the number of turns of the primary side winding is a certain amount or more, that is, when the thickness of the toroidal core including the primary side winding becomes larger than a predetermined value, the groove provided in advance can be used. It may be difficult to do. Further, the number of toroidal cores that can be supported by the support mechanism as described above is limited by the number of grooves provided in advance.

  On the other hand, the synthesis unit 15 of the present embodiment includes a plurality of toroidal cores 31, a first presser plate 41, a second presser plate 42, and a plurality of support bars 43. In the plurality of toroidal cores 31, the primary side winding 21 of the transformer 200 is wound, and the secondary side winding of the transformer 200 passes inside. The plurality of toroidal cores 31 are arranged in the axial direction of the toroidal core 31. The first pressing plate 41 is located on one side of the plurality of toroidal cores 31 in the axial direction. The second pressing plate 42 is located on the opposite side of the first pressing plate 41 with respect to the plurality of toroidal cores 31, and presses the plurality of toroidal cores 31 toward the first pressing plate 41. The plurality of support bars 43 are arranged separately in the θ direction, and support the plurality of toroidal cores 31 from the outside in the R direction. At least one of the plurality of support bars 43 is movable along the R direction with respect to the first presser plate 41.

  According to such a configuration, the plurality of toroidal cores 31 are supported by the first presser plate 41, the second presser plate 42, and the plurality of support bars 43, and their positions are fixed. That is, according to the above configuration, it is not necessary to provide the support mechanism with a groove to which the toroidal core 31 is attached or a groove to which a support plate that holds the toroidal core 31 is attached. When it is not necessary to provide the groove as described above, the shapes of the first presser plate 41, the second presser plate 42, and the plurality of support rods 43 can be changed even when the number of turns of the primary winding 21 is greatly increased or decreased. Each toroidal core 31 can be supported without change. That is, according to the support mechanism 32 of the present embodiment, the degree of freedom in changing the number of turns of the primary side winding 21 is large and the change can be easily handled.

  Moreover, according to the said structure, since it becomes unnecessary to provide a groove | channel in a support mechanism, the number of the toroidal type cores 31 is not restrict | limited by the number of the grooves provided previously. The plurality of toroidal cores 31 are arranged in a packed manner, for example. For this reason, the freedom degree of the change of the number of toroidal type cores 31 becomes large. That is, according to the above configuration, it is possible to flexibly cope with an increase or decrease in the number of toroidal cores 31. Moreover, according to the said structure, since the restriction | limiting regarding the thickness of toroidal core 31 itself is also lose | eliminated, it becomes possible to employ | adopt the toroidal core 31 of various shapes.

  Moreover, according to the said structure, it becomes unnecessary to perform the operation | work which inserts a toroidal type core and the support plate holding a toroidal type core one by one in the groove | channel of a support mechanism. For this reason, according to the said structure, the assembly property of the synthetic | combination part 15 can be improved.

  Moreover, according to the said structure, attachment and removal of each toroidal type core 31 can be performed separately by changing the position of the 2nd presser plate 42 and the support bar 43. FIG. That is, when changing the turns ratio of the transformer 200, it is not necessary to remove all the toroidal cores 31, and each toroidal core 31 can be removed alone. For this reason, for example, only the toroidal core 31 that requires changing the number of turns of the primary winding 21 can be removed and the number of turns of the primary winding 21 can be changed. For this reason, the disassembly operation | work and assembly operation | work of the synthetic | combination part 15 can be performed efficiently and wiring workability | operativity is also favorable.

  Furthermore, according to the above configuration, the plurality of toroidal cores 31 can be arranged to be packed together. Therefore, for example, the size of the combining unit 15 can be reduced as compared with a support member provided with a groove at a predetermined distance in advance.

  In the present embodiment, the first presser plate 41 and the second presser plate 42 are connected by a plurality of support bars 43. According to such a configuration, it is not necessary to provide a separate member for connecting the first presser plate 41 and the second presser plate 42, so that the configuration of the support mechanism 32 can be simplified. Thereby, size reduction and cost reduction of the synthetic | combination part 15 can be achieved.

  In the present embodiment, the first presser plate 41 has a first hole 41a extending along the R direction. At least one of the plurality of support bars 43 is inserted into the first hole 41a, and is movable along the R direction inside the first hole 41a. According to such a configuration, the support bar 43 can be provided to be movable with respect to the first presser plate 41 with a relatively simple configuration in the first presser plate 41 and the support bar 43 connected to each other.

In the present embodiment, the second presser plate 42 is movable along the plurality of support bars 43 in a direction approaching the first presser plate 41 and a direction moving away from the first presser plate 41. The second pressing plate 42 is fixed to at least one of the plurality of support bars 43 at a position where the plurality of toroidal cores 31 are pressed toward the first pressing plate 41.
According to such a configuration, even when the number of turns of the primary side winding 21 is changed and the thickness of the toroidal core 31 including the primary side winding 21 changes, the position of the second presser plate 42 is changed. By changing flexibly, a change in the thickness of the toroidal core 31 can be easily handled. Thereby, it is possible to more easily cope with a change in the number of windings of the transformer 200.

  In the present embodiment, the second presser plate 42 is detachably attached to the plurality of support bars 43. According to such a configuration, the plurality of toroidal cores 31 can be inserted between the plurality of support bars 43 with the second pressing plate 42 removed from the support bar 43. For this reason, the assembling work and the disassembling work of the synthesis unit 15 can be performed more efficiently.

  In the present embodiment, the second pressing plate 42 has a second hole 42a extending along the R direction. At least one of the plurality of support bars 43 is inserted into the second hole 42a and is movable along the R direction inside the second hole 42a. According to such a configuration, in the second presser plate 42 and the support bar 43 connected to each other, the support bar 43 can be provided movably with respect to the second presser plate 42 by a relatively simple configuration.

In the present embodiment, a screw 45 is formed on at least one outer peripheral surface 31 a of the plurality of support bars 43. At least one of the plurality of support bars 43 is attached with a first fixing member 51 that is screwed into the screw 45 and applies a force toward the plurality of toroidal cores 31 to the first presser plate 41.
According to such a configuration, the plurality of toroidal cores 31 can be supported more stably by the first pressing plate 41.

In the present embodiment, at least one of the plurality of support bars 43 is attached with a second fixing member 52 that engages with the screw 45 and applies a force toward the plurality of toroidal cores 31 to the second presser plate 42. ing. The first fixing member 51 and the second fixing member 52 move the position of the support bar 43 to which the first fixing member 51 and the second fixing member 52 are attached in the R direction from the first pressing plate 41 and the second pressing plate 42. It is fixed by the reaction force.
According to such a configuration, the plurality of toroidal cores 31 can be more stably supported by the second pressing plate 42. Further, the position of the support bar 43 in the R direction can be fixed with a relatively simple configuration. Thereby, workability | operativity of the operation | work regarding the movement of the support bar 43 can further be improved.

  Since the digital amplitude modulation apparatus 1 of the present embodiment includes the synthesis unit 15 described above, the number of windings of the transformer 200 can be easily changed, and workability can be improved.

  Next, some modified examples of the first embodiment will be described. The configurations other than those described below are the same as the configurations of the first embodiment described above. Moreover, all the modifications shown below are applicable also in 2nd Embodiment mentioned later.

(First modification)
FIG. 6 shows the synthesis unit 15 of the first modification.
As shown in FIG. 6, in the present modification, at least one first hole 41 a is a round hole corresponding to the outer diameter of the support rod 43. The at least one second hole 42 a is a round hole corresponding to the outer diameter of the support rod 43. For this reason, the position of the support rod 43 inserted into the first hole 41a and the second hole 42a, which are round holes, is fixed in the R direction.
According to such a configuration, the position of the at least one support rod 43 in the R direction is stably determined, so that the assembling property of the combining unit 15 may be improved. The number of support bars 43 whose positions in the R direction are fixed with respect to the first presser plate 41 and the second presser plate 42 are not limited to one, and may be two or more.

(Second modification)
FIG. 7 shows the synthesis unit 15 of the second modification.
As shown in FIG. 7, in the present modification, the first presser plate 41 of the first synthesis unit 15a and the first presser plate 41 of the second synthesis unit 15b are integrally formed by one first presser plate 41. Has been. Similarly, the second pressing plate 42 of the first combining unit 15a and the second pressing plate 42 of the second combining unit 15b are integrally formed by one second pressing plate 42.
According to such a configuration, since the number of parts is reduced, it is possible to reduce the cost of the synthesis unit 15 and improve the assemblability.

(Third Modification)
FIG. 8 shows the synthesis unit 15 of the third modification. For convenience of explanation, only one synthesis unit (first synthesis unit 15a) is shown here.
As shown in FIG. 8, in this modification, an insulating spacer 81 is provided between the plurality of toroidal cores 31. That is, in the present modification, the plurality of toroidal cores 31 and the spacers 81 are alternately arranged. The plurality of toroidal cores 31 and the plurality of spacers 81 are arranged in the −Z direction. The spacer 81 electrically isolates the primary side windings 21 of the plurality of toroidal cores 31.

  The spacer 81 is formed, for example, in a cylindrical shape having substantially the same outer diameter as the toroidal core 31. That is, a through hole 81h through which the secondary winding 22 passes along the −Z direction is provided at the center of the spacer 81.

  The plurality of support bars 43 support the outer peripheral surfaces 81a of the plurality of spacers 81 in contact with the outer peripheral surfaces 81a of the plurality of spacers 81 from the outer peripheral side in the R direction. Accordingly, the plurality of support bars 43 fix the positions of the plurality of spacers 81 in the R direction.

  According to such a configuration, the insulation between the primary windings 21 of the plurality of toroidal cores 31 can be more reliably ensured. The spacer 81 may have flexibility (elasticity), for example. If the spacer 81 has flexibility, even when the winding of the primary side winding 21 of each toroidal core 31 is biased, distortion caused by the winding can be absorbed by the spacer 81. Thereby, it becomes easy to arrange a plurality of toroidal cores 31 along the axial direction.

(Second Embodiment)
Next, referring to FIG. 9 and FIG. 10, the transmitter synthesizing unit 15 and the digital amplitude modulation apparatus 1 according to the second embodiment will be described. This embodiment is different from the first embodiment in that it relates to the wiring path of the secondary winding 22. The remaining configuration of the present embodiment is the same as that of the first embodiment.

FIG. 9 is a plan view showing the synthesis unit 15 of the present embodiment.
In the present embodiment, the secondary windings 22 are connected in parallel so as to face the primary windings 21 of the transformers 201 to 20n. That is, each of the plurality of secondary windings 22 extends from one grounded end, passes through only one toroidal core 31 (through hole 31 h), and is electrically connected to the filter unit 16. . Thus, a parallel addition type combining unit 15 is formed.
A spacer 81 is provided between the plurality of toroidal cores 31. Thereby, a gap is formed between the plurality of toroidal cores 31 through which the secondary winding 22 passes.

10 is a cross-sectional view taken along line F10-F10 of the spacer 81 shown in FIG.
As shown in FIG. 10, the spacer 81 is formed in a cylindrical shape having substantially the same outer diameter as the toroidal core 31, for example. The spacer 81 is accommodated between the plurality of support bars 43 and supported by the plurality of support bars 43 from the outside in the R direction. Thereby, the position of the spacer 81 in the R direction is fixed.
The spacer 81 has a notch 81b through which the secondary winding 22 passes in the R direction. That is, the secondary winding 22 extends from the inside of the spacer 81 to the outside of the spacer 81 by passing through the notch 81 b.

  According to such a configuration, as in the first embodiment, the number of windings of the transformer 200 can be easily changed, and the synthesizer 15 and the digital amplitude modulation device that can improve workability. 1 can be provided.

Heretofore, some embodiments and modifications have been described. The embodiments and the modifications are not limited to those described above. For example, in some of the above-described embodiments and modifications thereof, an Mn—Zn ferrite core is shown as an example of the toroidal core 31. However, the toroidal core 31 may be a Ni-Zn ferrite core, a toroidal core formed of a soft magnetic material such as pure iron, electromagnetic steel, amorphous metal (Fe), or nanomaterial.
In the above-described several embodiments and modifications thereof, a medium wave broadcasting device is taken as an example, and a synthesizing unit that synthesizes a single sine wave signal or rectangular wave signal to generate an AM wave has been described. The above embodiment is not limited to the above example, and a synthesis unit that generates an FM wave (Frequency Modulation Wave), an OFDM wave (Orthogonal Frequency Division Multiplexing Wave), and the like by changing the amplitude, frequency, and phase. It can also be applied to a digital amplitude modulation device.
Moreover, the synthetic | combination part 15 may be used as a vertical installation type along a vertical direction, for example, and may be used as a horizontal installation type along a horizontal direction.

  According to at least one embodiment described above, the transmitter combining unit includes a plurality of toroidal cores, a first presser plate, a second presser plate, and a plurality of support bars. The first pressing plate is located on one side of the plurality of toroidal cores in the axial direction of the toroidal core. The second pressing plate is located on the opposite side of the plurality of toroidal cores from the first pressing plate, and presses the plurality of toroidal cores toward the first pressing plate. The plurality of support bars are arranged separately in the circumferential direction of the plurality of toroidal cores, and support the plurality of toroidal cores from the outside in the radial direction of the plurality of toroidal cores. At least one of the plurality of support bars is movable along the radial direction with respect to the first pressing plate. According to such a configuration, the number of windings of the transformer can be easily changed.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Digital amplitude modulation device, 15 ... Synthesis | combination part, 20 ... Transformer, 21 ... Primary side winding, 22 ... Secondary side winding, 31 ... Toroidal core, 41 ... 1st presser plate (1st support member) , 41a ... first hole, 42 ... second presser plate (second support member), 42a ... second hole, 43 ... support bar (third support member), 45 ... screw, 51 ... first fixing member, 52 ... Second fixing member, C ... central axis.

Claims (7)

A plurality of toroidal cores wound around the primary winding of the transformer and arranged in the axial direction of the central axis while the secondary winding of the transformer passes through the inside;
A first support member positioned on one side of the plurality of toroidal cores in the axial direction;
A second support member that is positioned opposite to the first support member with respect to the plurality of toroidal cores, and that holds the plurality of toroidal cores toward the first support member;
A plurality of third support members arranged separately in the circumferential direction of the plurality of toroidal cores and supporting the plurality of toroidal cores from the outside in the radial direction of the plurality of toroidal cores;
With
At least one of the plurality of third support member, Ri movable der along the radial direction with respect to the first support member,
The first support member and the second support member are connected by the plurality of third support members,
The first support member has a first hole extending along the radial direction,
At least one of the plurality of third support members is inserted into the first hole, and is a transmitter combining unit that is movable along the radial direction inside the first hole . A plurality of toroidal cores wound around the primary winding of the transformer and arranged in the axial direction of the central axis while the secondary winding of the transformer passes through the inside;
A first support member positioned on one side of the plurality of toroidal cores in the axial direction;
A second support member that is positioned opposite to the first support member with respect to the plurality of toroidal cores, and that holds the plurality of toroidal cores toward the first support member;
A plurality of third support members arranged separately in the circumferential direction of the plurality of toroidal cores and supporting the plurality of toroidal cores from the outside in the radial direction of the plurality of toroidal cores;
With
At least one of the plurality of third support member, Ri movable der along the radial direction with respect to the first support member,
The first support member and the second support member are connected by the plurality of third support members,
The second support member is movable along the axial direction in a direction approaching the first support member and in a direction away from the first support member, and the plurality of toroidal cores are moved to the first support member. A transmitter synthesizing unit fixed to at least one of the plurality of third support members at a position pressed toward the support member . A plurality of toroidal cores wound around the primary winding of the transformer and arranged in the axial direction of the central axis while the secondary winding of the transformer passes through the inside;
A first support member positioned on one side of the plurality of toroidal cores in the axial direction;
A second support member that is positioned opposite to the first support member with respect to the plurality of toroidal cores, and that holds the plurality of toroidal cores toward the first support member;
A plurality of third support members arranged separately in the circumferential direction of the plurality of toroidal cores and supporting the plurality of toroidal cores from the outside in the radial direction of the plurality of toroidal cores;
With
At least one of the plurality of third support member, Ri movable der along the radial direction with respect to the first support member,
The first support member and the second support member are connected by the plurality of third support members,
The second support member is a combining unit for a transmitter that is detachably attached to the plurality of third support members . A plurality of toroidal cores wound around the primary winding of the transformer and arranged in the axial direction of the central axis while the secondary winding of the transformer passes through the inside;
A first support member positioned on one side of the plurality of toroidal cores in the axial direction;
A second support member that is positioned opposite to the first support member with respect to the plurality of toroidal cores, and that holds the plurality of toroidal cores toward the first support member;
A plurality of third support members arranged separately in the circumferential direction of the plurality of toroidal cores and supporting the plurality of toroidal cores from the outside in the radial direction of the plurality of toroidal cores;
With
At least one of the plurality of third support member, Ri movable der along the radial direction with respect to the first support member,
The first support member and the second support member are connected by the plurality of third support members,
The second support member has a second hole extending along the radial direction,
At least one of the plurality of third support members is inserted into the second hole, and is a transmitter combining portion that is movable along the radial direction inside the second hole . A screw is formed on at least one outer peripheral surface of the plurality of third support members,
At least in part of the plurality of third support members, claim the first fixing member to apply a force toward the plurality of toroidal core to said first support member threaded into said screw is attached 1 The combining unit for the transmitter according to any one of claims 1 to 4 . At least one of the plurality of third support members is attached with a second fixing member that is screwed into the screw and applies a force toward the plurality of toroidal cores to the second support member,
The first fixing member and the second fixing member are arranged such that the radial positions of the third supporting member to which the first fixing member and the second fixing member are attached are the first supporting member and the second fixing member. The combining unit for a transmitter according to claim 5 , wherein the transmitter is fixed by a reaction force received from the support member. A combining unit for the transmitter according to any one of claims 1 to 6,
A plurality of amplifiers to which the transformer of the combining unit is connected;
A digital amplitude modulation apparatus comprising:

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