JPH0441529B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a block filter for a power line carrier control device that superimposes a carrier signal on a power line to control load equipment.

Conventional configuration and its problems The configuration of a power line transfer control device is shown in FIG. 1 using a single-phase three-wire system as an example. In other words, controller (master device) 2, load devices 1 ₁ to 1 ₅ and slave device 3 are connected to the single-phase three-wire u, o, and v 100V (u-o and v-o) and 200V power lines (u-v). ~7
A carrier signal is superimposed on the power line between the master unit 2 and slave units 3 to 7, and bidirectional communication is performed between the load devices 1 _{to 1} .
₁₅ was controlled. In this power line carrier control device, the block filter 1 has a carrier signal frequency f ₀
On the other hand, it has high impedance circuits Z ₁ and Z ₂ and low impedance circuits Z ₃ and Z ₄ to prevent the carrier signal from leaking from the load side to the outside of the block filter 1 (power supply side). Z ₅ and Z ₆ are circuits that transmit carrier signals to other phases. It also enables communication between

A conventional block filter 1 is shown in FIGS. 2a and 2b. 8 is a terminal fitting. The large current capacity inductors connected in series to each live wire u and v are coil 9 and core 1.
0, 10' and a gap 11, and the cores 10, 10' are fixed to a block filter base 13 with fasteners 12. All other circuit components 14 were mounted on a printed circuit board 15, and this printed circuit board 15 was fixed near the large current capacity inductor. The large current capacity inductor requires two U-shaped cores (10, 10') and a gap of 1.
1, the shape is large and at the same time a stopper 12 is required, and assembly including adjustment of the gap 11 is complicated. Also core 10,1
Since 0' forms a closed magnetic path through the gap 11, there is a problem in that magnetic saturation occurs due to the flow of a large commercial frequency current, resulting in a decrease in the block level.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional problems, and has no magnetic saturation, is easy to assemble, is small,
The object of the present invention is to provide a lightweight and inexpensive block filter for a power line transport control device.

Structure of the Invention In order to achieve this object, the present invention connects a circuit with high impedance to the power line carrier signal frequency in series to the power line, and connects a circuit with low impedance to the power line carrier signal frequency between the power lines. The cores of the large current capacity inductors constituting the high impedance circuit are U-shaped so as not to form a closed magnetic path, and the cores are arranged in block filter cases with their openings facing toward the outer walls. , a printed circuit board on which all other circuit components are mounted is installed below the large current capacity inductor.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 3 to 8. FIG. 3 shows the circuit configuration of a block filter in the case of a single-phase three-wire system. Reference numerals 1 and 2 are block filters and master devices similar to the conventional example, 3 to 7 are slave devices similar to the conventional example, and 1 ₁ to 1 ₅ are load devices similar to the conventional example. And L ₁ , C ₁ and L ₂ , C ₂ are parallel resonant circuits, and L ₃ , C ₃ and L ₄ , C ₄ are series resonant circuits, with high impedance and low impedance, respectively, for the signal frequency f ₀ . , L ₅ ,
C ₅ , L ₆ , and C ₆ are components that constitute a signal transmission circuit to other phases. Large current capacity inductor connected in series to each live wire u, v of single-phase three-wire power line u, o, v
L ₁ and L ₂ are coils wound around both legs of the U-shaped core 16, and fourth coils are placed in recesses 19 and 20 that fit into the lower half of the U-shaped core 16 in the thickness direction formed in the block filter case 18. As shown in Figure a, the U-shaped openings are fitted into each other facing the outer wall. Then, as shown in FIG. 6, the core 16 is pressed by fixing the lid 21 to the tip of the projection 22 of the lid 21 via an elastic body (rubber) 23 with a screw (not shown). The core 16 is fixed together with the recesses 19 and 20.

On the other hand, the other circuit components C ₁ to _{C 6} and L ₃ to L ₆ of the resonant circuit are mounted on the printed circuit board 24 as shown in FIG. 4b, and the circuit components C ₁ to C ₆ and
_L3 to _L6 are oriented downward and installed below the large current capacity inductors _L1 and _L2 , and wiring is provided to satisfy the circuit diagram of the block filter 1 shown in FIG.

In the conventional closed magnetic circuit core using two cores with a gap, as mentioned above, unless the gap is made considerably large, magnetic saturation will occur due to the large current of the commercial power supply, resulting in a decrease in the block level. In this example, as shown in Fig. 7, the magnetic fluxes φ _u and φ _v have a lot of leakage, and even when a large current is passed, magnetic saturation does not occur and the characteristics do not deteriorate, and the openings of the cores 17 are made to face outward from each other. Therefore, there is no effect on other phases due to leakage magnetic flux. As shown in FIG. 8, when a rod-shaped core 25 is used, leakage magnetic flux affects other phases, resulting in deterioration of the block filter. As described above, using the U-shaped core 16,
A great effect can be achieved by arranging the openings facing outward from each other. Further, since there is no need for metal fittings to fix the core 16, and there is no need for conventional gap adjustment which greatly affects the inductance value, there is an advantage that the number of assembly steps can be greatly reduced. Also, as shown in Figure 4, place the core 16 horizontally,
Since the printed circuit board 24 with circuit components mounted thereon is installed underneath, space can be used efficiently, the space factor can be greatly improved, and the device can be significantly reduced in size and weight. Specifically, the assembly man-hours were reduced by 60% and the dimensions were significantly improved by 45% in terms of volume compared to the conventional model.

Note that in the present invention, a high impedance circuit connected in series with a power line has high impedance with respect to the carrier signal frequency, but
Low impedance for 50Hz (or 60Hz). i.e. power frequency 50Hz (or 60Hz)
The current flows through the inductor when the inductor and capacitor are connected in parallel. The value of the inductor is 10mH, so there is no voltage drop at commercial frequencies. Therefore, efficiency does not decrease.

Effects of the Invention According to the present invention, it is possible to obtain stable performance without lowering the block level due to magnetic saturation, reduce assembly man-hours, and provide an excellent effect of providing a small, lightweight, and low-cost block filter. It is something to play.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a power line transfer control device, Fig. 2a and b are a plan view and a front view of a conventional block filter, and Fig. 3 shows a block filter of a power line transfer control device according to an embodiment of the present invention. The circuit diagram, Figures 4a and 4b are the plan view of the same block filter and A-
5 is a partial perspective view of the block filter case, FIG. 6 is a partial sectional view of the block filter, FIG. 7 is an explanatory diagram showing the magnetic flux of the same embodiment, and FIG. 8 is a partial perspective view of the block filter case. FIG. 3 is an explanatory diagram of the influence of magnetic flux between other phases. 1...Block filter, _L1 , _L2 ...Large current capacity inductor, 16...U-shaped core, 17
...Coil, 18...Block filter case,
19, 20... recess, 21... lid, 22... protrusion, 23... elastic body, 24... printed circuit board,
_C1 to _C6 , _L3 to _L6 ...Circuit components.

Claims (1)

[Claims] 1. A circuit with high impedance relative to the power line carrier signal frequency is connected in series with the power line, and a circuit with low impedance relative to the power line carrier signal frequency is connected between the power lines, and the high impedance circuit is connected in series with the power line. The cores of the high current capacity inductors are U-shaped without forming a closed magnetic path, and the cores are arranged in block filter cases with their openings facing the outer walls of each other, and the cores are arranged in block filter cases with their openings facing the outer walls. A block filter of a power line transfer control device is equipped with a printed circuit board on which all other circuit components are attached. 2. The block filter case comprises a recess into which about the lower half of the U-shaped core fits, and a lid that presses from above the core through an elastic body to fix the core. block filter for power line carrier control equipment.