JPS6069919A - Block filter of power line carrier controller - Google Patents

Abstract

PURPOSE:To obtain a small size and multi-functional block filter by incorporating a current detecting function utilizing a magnetic sensor in the block filter. CONSTITUTION:An L1 and a C1 in a high impedance circuit form a parallel resonance circuit resonated at a carrier frequency f0. The L1 is an inductance having a large current capacity to which a current of commercial power supply flows. A magnetic core of the coil 11, a ferrite core 12 and a core gap 13 preventing magnetic saturation by a large current I are formed. Moreover, a low impedance circuit is an LC series resonance circuit and its resonance frequency is coincident with the f0. A large block level is obtained to a carrier signal by both resonance circuits. Then a Hall element is sticked to a core end face of the core gap 13 as a magnetic sensor and the magnetic flux generated by a current I flowing to the coil 11 exists in the core 12 of a high permeability, and a magnetic field vertical to the Hall element 14 is activated and highly sensitive current detection is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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 Structure J=Problems The structure of a power line transfer control device is shown in FIG. 1, taking the case of a single-phase three-wire power line as an example. The main controller (sharp device) 2, slave devices 3 to 7, and negative power devices are installed on each of the single-phase three-wire power lines u, o, and v, 1ooV (u-o and v-o) and 200V power line (U-V). Connect 7!1 to 715,
Connect the power line between the sharp device 2 and the child device 3 to γ by 1n,
It performs bidirectional data linkage and controls the load devices 7!1 to β5. In this power line carrier control device, a block filter 1 has high impedance circuits 21 and 22 and a low impedance circuit z for the carrier input frequency fo.
3, and Z4 to prevent the carrier signal from leaking from the load side to the outside of the block filter (power supply side).

z5 and z6 are circuits that transmit carrier signals to other phases, and in FIG. It made communication possible. In this power line carrier control device, the purpose of current detection is to always use the load devices e1 to e15 at a current below the specified current associated with the customer's contract power.
If the current exceeds a certain level, an excessive current alarm is generated or the load devices 711 to 15 with set priorities are turned ON10F in sequence.
F, so-called peak cut and simple current monitoring become possible. Conventional current value detection II uses a current transformer (CT) 8 attached to the power line, and a communication module 6 that takes in this detected current and communicates it to the main controller 2.
- had a rule of 9. For rjl phase three wire power line,
CT8 and CTlo are used, and the sum of these is required.

In this way, the conventional block filter 1 and CTs.

10 and the communication module 9 exist separately, and the CTs 8 and 10 in particular are large in size, requiring a large amount of space.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and aims to provide a small and multifunctional block filter by incorporating a current detection function using a magnetic sensor in the block filter. That is.

Structure of the Invention In order to achieve this objective, the present invention connects a high impedance circuit in series to the power line with respect to the power line carrier frequency, connects a low impedance circuit between the power lines, and connects the high impedance knob to the power line. A magnetic sensor is arranged, a sensor drive circuit is provided to amplify the output voltage of the magnetic sensor, and a power line current detection function is provided.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 5 of the drawings. Note that the power line transfer control device is the same as that shown in FIG. 1 except for the current detection circuit. FIG. 2(a) shows a high impedance circuit of a block filter, where Ll and C1 form a parallel resonant circuit that resonates at the carrier frequency fo. The above is an inductor with a large current capacity through which a commercial power supply current flows, and this configuration is shown in FIG. The magnetic core of the coil 11 is a ferrite core 12, and a core gap 13 is formed in order to prevent magnetic saturation by high current machining. A low impedance circuit is shown in Figure 2 (b
) is an LC series resonant circuit shown in FIG.
. matches. This series and parallel resonant circuit presents a large block level to the carrier signal. Then, a Hall element 14 as a magnetic sensor is pasted on the core end face of the core gear knob 13 with adhesive. The magnetic flux generated by the electric current flowing through the coil 11 is transferred to the ferrite core 12 with high magnetic permeability, except for some leakage magnetic flux.
A magnetic field acts perpendicularly on the Hall element 14 in the core gear knob 13 of the core 12, allowing highly sensitive light detection.The output voltage of the Hall element 14 is as shown in Fig. 4. As shown in the block diagram, this analog signal is output to the sensor drive circuit 15, and this analog signal is sent to the A/D conversion circuit 1.
6, it is converted to a digital signal, and the micro
In the MPU) 17, the voltage value is converted to a current value, which is converted into communication data for communication with the main controller 2, etc., and then modulated by the power line carrier frequency in the modulation/amplification FT] circuit 18, and then converted into a type rl and sent to the coupling circuit 19. is injected into the power line 20 via. Each of these circuits 15 to 19,
Large current capacity inductor L forming block filter 1
l All other circuit parts 21 except f are attached to the printed circuit board 2.
2-1-, with the circuit component 21 facing downward, install it on the base 23 of the large current capacity inductor L1, connect the terminal 24 to the power line 20, and conduct the wiring to form the block 1 to detect the current. Moreover, it is possible to realize a block filter 1 that can communicate the current information to the main controller 2 via power line transmission.

Furthermore, if a converter circuit is provided in place of the digital converter circuit 16 provided at the subsequent stage of the sensor drive circuit 15, an alarm signal can be generated when the current value exceeds the set value, and the alarm signal can be communicated to the main controller 2. If the panel 26 of the short block filter 1 is provided with a DIGITUFF 1 display section or an alarm generating section, it is possible to generate a current monitor or OAT < 1 code alarm at the block level 1.

As the magnetic sensor 14, a magnetoresistive element can also be used in addition to a Hall element.

Effects of the Invention According to the present invention, it is possible to perform not only current detection but also communication with a communication module in a power line carrier control device, with the same dimensions as conventional block level sensors, and space-saving, inexpensive, and highly accurate current detection. It has excellent effects that can be realized.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a conventional power line carrier control device, and Figure 2 (
&) is a configuration diagram of a high impedance circuit, Figure 2(b)
is a configuration diagram of a low impedance circuit, FIG. 3 is an explanatory diagram of a large current capacity inductor in an embodiment of the present invention, FIG. 4 is a block diagram of a current detection circuit of the same embodiment, and FIG. 5 is a diagram of a current detection circuit of the same embodiment. FIG. 2 is an explanatory diagram of a block filter. 1...Block filter, Zl, Z2...High impedance circuit, Z3-Z5...Low impedance circuit, Ll...Large current capacity inductor,
12. Core, 13. Core gap, 14.
...Hall element (magnetic sensor), 15...Sensor drive circuit. Name of agent: Patent attorney Toshio Nakao and one other person B'
;: @c1 Cζshi) (Toninuma 31'17I 4 Library 5 Figure 5 Procedural amendment 1 Display of case 1988 Patent application No. 177304 2 Name of invention Block filter 3 of power line carrier control device Correction Relationship with the patent case Patent application Person name 1006 Kadoma, Kadoma City, Osaka Prefecture Name (
582) Matsushita Electric Industrial Co., Ltd. Representative Toshihiko Yamashita 4 Agent 571 Address 1006 Oaza Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 5 Subject of amendment 6 Contents of amendment (1) Patent for specification The entire scope of claims column will be amended as shown in the attached sheet. (2) 1-Power line on page 3 for specifications, line 17 to line 40, line 4. ” 1) A high impedance circuit with respect to the power line carrier frequency is connected in series with all power lines, and a low impedance circuit is connected between all power lines,
A magnetic sensor for current detection is disposed within a core gap of a large current capacity inductor constituting the high impedance circuit, a sensor drive circuit is provided to amplify the output voltage of the magnetic sensor, and the detected current value is displayed. The display section and the communication circuit section for communicating the detected current value were completely destroyed. ” and add +E to it. 2. Scope of claims

Claims (1)

[Claims] High impedance circuits are connected in series to the power line with respect to the power line carrier frequency, and low impedance circuits are connected between the power lines, and a magnetic sensor is placed in the gap between the cores of the large current capacity inductors that constitute the high impedance circuit. and a block filter for a power line transfer control device, comprising a sensor drive circuit for amplifying the output voltage of the magnetic sensor.