JPH08240619A - Electric variable-quantity sensor and conduction detector using the sensor - Google Patents

Abstract

PURPOSE: To provide an electric variable-quantity sensor, which can readily be constituted compact and at reduced cost, and further provide a conduction detector using this sensor in a fale-safe constitution. CONSTITUTION: A hole 5 is provided in an insulating plate 2, and a saturable amorphous core 4 is embedded. A part 6 of the insulating plate 6 is filled back. One-surface printed boards 1 and 3 are bonded to both surfaces of the insulating plate 2 machined in this way. Printed patterns constituting an input coil 7 and an output coil 8 are formed on the upper surface of the board 1 and the lower surface of the board 3. The printed patterns are connected with through holes 10, and a coil 7 and a coil 8 are constituted. A conductor 9, which is penetrated through the inner side of the core 4, is provided and made to be the detecting coil of one pattern. A load is connected to the conductor 9 in series. When the load is conducted, the core 4 is saturated with the current, and the voltage is not generated in the coil 7. Thus, the current conduction is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric variable sensor having a flat plate-like saturable core and a current detection device for a lamp or the like using the same.

[0002]

2. Description of the Related Art Conventionally, in a traffic signal, there is a device shown in FIG. 6 as an energization detecting device for detecting whether or not each lamp is energized. In FIG. 6, reference numeral 60 is a lamp for which energization is detected, and 61 is a transformer as a voltage sensor. The primary coil 62 of the transformer 61 is connected in parallel with the lamp 60, and a detection signal is obtained from the secondary coil 63. That is, when the lamp 60 is energized, a voltage is generated at the input end of the lamp 60, is applied to the primary coil 62, and a voltage of the lamp 60 voltage × turn ratio is generated in the secondary coil 63. It is supplied to the output terminal 64. If the lamp 60 is not energized, there is no voltage at the input end of the lamp 60, no voltage is generated in the secondary coil 63, and no voltage is supplied to the output terminal 64. Therefore, the energization can be detected by the voltage generation of the secondary coil 63 and the presence or absence of the voltage of the output terminal 64.

In addition, there is a current sensor type energization detecting device for detecting a magnetic flux generated by a lamp current with a hall element.

[0004]

However, in the device shown in FIG. 6, when a disconnection occurs at either the primary side or the secondary side of the transformer 61, the output terminal 64 is supplied even if the lamp 60 is energized. No voltage is supplied to the lamp 6
It is determined that 0 is not energized or the lamp 60 is not lit. If this lamp 60 is G
In the case of a light (green traffic light), even if the G light is erroneously turned on, if there is a disconnection failure in the transformer 61, GG detection (simultaneous lighting detection of G lights in intersecting passages) cannot be performed, and a failure occurs Cannot be a safe configuration.

In the above-mentioned current sensor type energization detecting device, if the circuit of the Hall element is broken, it is determined that the lamp is energized but not energized, and the GG detection fails. Cannot be a safe configuration.

Further, in the apparatus shown in FIG. 6, since a transformer is used as a sensor, it is difficult to reduce the size, and winding work is required, so that cost reduction is also difficult.

The present invention has been made under such circumstances, and an electric variable sensor which can be easily downsized and reduced in cost, and an electrification detection using the electric variable sensor, which can realize a fail-safe configuration. The purpose is to provide a device.

[0008]

In order to achieve the above object, the present invention comprises a saturable core in the form of a plate and a coil composed of a printed pattern of a printed circuit board to constitute a sensor. The static variable sensor is configured as in the following (1) to (4), and the energization detecting device is configured as in the following (5) and (6).

(1) A plate-like saturable core forming a magnetic closed circuit and the saturable core sandwiched from both sides,
Input coil with printed pattern and through hole
An electrical variable sensor comprising two single-sided printed circuit boards constituting an output coil and a detection coil made of a conductor penetrating the inside of the saturable core.

(2) A plate-like saturable core forming a magnetic closed circuit, and the saturable core sandwiched from both sides,
Input coil with printed pattern and through hole
An electrical variable sensor including an output coil and two single-sided printed circuit boards that constitute a detection coil.

(3) A single-sided printed circuit board that constitutes a part of each of the input coil and the output coil by the printed pattern and the through hole, and is arranged on the surface of the single-sided printed circuit board on which the printed pattern is not formed. A flat plate-like saturable core that constitutes a magnetic closed circuit and a DIP package type that is mounted in a through hole of the single-sided printed circuit board across a part of the saturable core and constitutes the other part of the input coil. A first coil member, and a second coil member of a DIP package type that is mounted in a through hole of the single-sided printed circuit board across another part of the saturable core and constitutes another part of the output coil; An electrical variable sensor, comprising a detection coil made of a conductor that penetrates the inside of the saturable core.

(4) A single-sided printed circuit board that constitutes a part of each of the input coil, the output coil, and the detection coil by the printed pattern and the through hole, and on the surface of the printed circuit board on which the printed pattern is not formed. A saturable core in the form of a plate, which is arranged and constitutes a magnetic closed circuit,
A DIP package type first coil member which is mounted in a through hole of the single-sided printed circuit board and extends over a part of the saturable core to constitute the other part of the input coil, and a first coil member similar to the first coil member. A second coil member that configures the other part of the output coil, and the first coil
An electrical variable sensor having a third coil member, which has the same configuration as that of the coil member, and which constitutes the other part of the detection coil.

(5) An energization detecting device in which the detecting coil of the electrical variable sensor according to (1) or (3) is connected in series to a load.

(6) A plurality of electric variable sensors according to (1) or (3) above, and a logic circuit for performing a logical operation based on signals from the output coils of the plurality of electric variable sensors. An energization detection device equipped with.

[0015]

With the configurations (1) to (4), when a current flows through the detection coil, the saturable core is saturated, the electromagnetic coupling between the input coil and the output coil is lost, and the voltage is output to the output coil. It will not occur, and the sensor can be downsized and the cost can be reduced.

In the configurations (5) and (6), energization can be detected in a fail-safe manner, and in the configuration (6), a required logic output can be obtained.

[0017]

EXAMPLES The present invention will be described in detail below with reference to examples.

(Embodiment 1) FIG. 1 is a diagram showing a structure of an "electrical variable sensor" which is Embodiment 1, in which (a) shows each element separately, and (b) shows a connection. ing. FIG.
In (a), 1 and 3 are single-sided printed circuit boards, 2 is an insulating plate, and 4 is a plate-like saturable amorphous core forming a magnetic closed circuit. In FIG. 1B, 7 is an input coil, 8 is an output coil, and 9 is a conductor penetrating the inside of the saturable amorphous core 4, and this conductor 9 constitutes a one-turn detection coil. Reference numeral 10 is a through hole provided in the single-sided printed circuit boards 1 and 3 and the insulating plate 2.

The sensor 100 of this embodiment has holes 5 in the insulating plate 2.
, The saturable amorphous core 4 is embedded in the hole 5, a part 6 of the insulating plate 2 is backfilled inside the saturable amorphous core 4, and the single-sided printed circuit board is formed on both sides of the insulating plate 2 thus processed. 1 and 3 are bonded with their copper-clad surfaces to the outside, printer patterns for forming the input coil 7 and the output coil 8 are formed on the single-sided printed boards 1 and 3, and the single-sided printed board 1, the insulating plate 2, A through hole is provided which penetrates the laminated body of the single-sided printed circuit board 3 so that the print pattern of the single-sided printed circuit board 1 and the print pattern of the single-sided printed circuit board 3 are connected to form the input coil 7 and the output coil 8. It's done.

Single-sided printed circuit board 1 in the laminated body
On the side, the input coil 7 and the output coil 8 of FIG.
Solid line portions are formed by a printed pattern, and broken line portions of the input coil 7 and the output coil 8 shown in FIG. 1B are formed on the single-sided printed circuit board 3 side. It is connected through the hole 10.

The saturable amorphous core 4 is manufactured by a known method such as sputtering, vacuum deposition, plating or the like. The print pattern and through holes are also formed by a known method used for processing a printed circuit board.

FIG. 2 shows the structure and characteristics of the saturable reactor 20 in which the coil 22 is wound around the saturable amorphous core 21 and the conductor 23 is penetrated through the core 21. Zo is the impedance of the coil 22 when the current i flowing through the conductor 23 is zero, and Zi is the current i flowing through the conductor 23 is 0.1 A,
Impedance at 0.2A and 0.5A.

As shown in FIG. 2 (b), at i = 0.1 A or higher, the impedance of the coil 22 drops to 1/10 over a wide frequency range. That is, it can be seen that the saturable amorphous core 21 is saturated by the current i flowing through the conductor 23, and the relative magnetic permeability of the core 21 decreases to nearly 1.

In the sensor 100 of the present embodiment shown in FIG. 1 as well, like the saturable reactor 20 of FIG. 2, when a certain amount of current flows through the conductor 9, the saturable amorphous core 4 is saturated and the relative permeability of the core 4 is increased. Becomes close to 1, and the electromagnetic coupling between the input coil 7 and the output coil 8 weakens. Therefore,
When an AC signal is applied to the input coil 7 and a voltage is generated in the output coil 8 due to electromagnetic coupling, when a current flows through the conductor 9, the electromagnetic coupling is weakened and the voltage of the output coil 8 approaches zero. descend. That is, this embodiment operates as a current sensor.

As described above, in this embodiment, since the flat plate-shaped core and the printed circuit board are used, miniaturization is easy and the winding work is not required, and a known printed circuit board is processed. Since it can be manufactured by technology, cost reduction is easy.

In this embodiment, the conductor 9 constitutes the detection coil, but as a modification, the detection coil also includes
Like the input coil 7 and the output coil 8, the printed patterns of the printed boards 1 and 3 and the through holes can be formed. The electrical variable sensor thus obtained can be used as a current sensor or a voltage sensor for a small current because the number of turns of the detection coil can be increased.

(Embodiment 2) FIG. 3 is a diagram showing the construction of an "electrical variable sensor" according to a third embodiment. As shown in FIG. 3A, the electric variable sensor 300 of this embodiment includes a single-sided printed circuit board 30, a saturable amorphous core 31 arranged on the single-sided printed circuit board 30, and the saturable amorphous core 31. The coil members 32 and 33 are mounted on the one-sided printed circuit board 30 over a portion of the above, and the conductor 34 penetrates the saturable amorphous core 31 and the one-sided printed circuit board 30. Conductor 3
Reference numeral 4 constitutes a one-turn detection coil.

FIG. 3B is a plan view of the coil members 32 and 33, and FIG. 3C is a diagram showing the positional relationship between the single-sided printed circuit board 30, the coil members 32 and 33, and the saturable amorphous core 31. FIG. 3D is a diagram showing the print pattern and the through holes formed on the lower surface of the single-sided printed circuit board 30 as seen through from the upper surface.

The input coil is composed of the coil member 32 and the print pattern of the single-sided printed circuit board 30 connected thereto, and the output coil is composed of the coil member 33 and the print pattern of the single-sided printed circuit board 30 connected thereto. ing.

Each of the coil members 32 and 33 is a DIP package type of an IC in which a conductor group arranged in two layers of five pieces is hardened with a synthetic resin. As shown in FIG. 3C, the DIP package type coil members 32 and 33 are placed on the saturable amorphous core 31 and connected (mounted) to the through holes 40 to 59 of the single-sided printed circuit board.
An input coil and an output coil are configured.

Also in this embodiment, similarly to the first embodiment, the conductor 34
The strength of the electromagnetic coupling between the input coil and the output coil changes depending on the presence / absence of the current flowing through the device, and the device operates as a current sensor.

As described above, in this embodiment, since the flat core, the printed board, and the coil member of the DIP package type are used, it is easy to miniaturize, and
A well-known printed circuit board processing technology that does not require winding work,
Since it can be manufactured by the C mounting technology, the cost can be easily reduced.

In this embodiment, the conductor 34 constitutes the detection coil, but as a modification, the detection coil is
Similar to the input coil and the output coil, the print pattern of the single-sided printed circuit board 30, the through hole, and the DIP.
It can be composed of a package type coil member.
The electrical variable sensor thus obtained can be used as a current sensor or a voltage sensor for a small current because the number of turns of the detection coil can be increased.

(Embodiment 3) FIG. 4 is a diagram showing the construction of an "energization detecting device" according to Embodiment 3. In FIG. In FIG. 4, 4
0 is a signal source of 10 to 100 KHz, 41 is this signal source 4
0 is an input coil connected to 0, 42 is a saturable amorphous core, 43 is a conductor serially connected to the G lamp 45, 44 is an output coil, and 46 is an output terminal. The conductor 43 constitutes a one-turn detection coil.

The electrical variation sensor (current sensor) of the first or second embodiment can be used for the energization detecting device 400 of the present embodiment. To the G light 45, through the conductor 43,
Direct current or commercial frequency alternating current is supplied.

When the G lamp 45 is not turned on, that is, when the G lamp 45 is not energized, the saturable amorphous core 42 does not saturate, and the input coil 41, the saturable amorphous core 42, and the output coil 44 are used. Functions as a transformer, so that the output voltage is supplied to the output terminal 46.
When the G lamp 45 is turned on and a current flows through the conductor 43, the saturable amorphous core 42 is saturated, the electromagnetic coupling between the input yl 41 and the output coil 44 is weakened, and the output voltage to the output terminal 46 disappears.

If there is a break in the input coil 41 or the output coil 44, a break in the connection line between the signal source 40 and the input coil 41, or a break in the connection line between the output coil 44 and the output terminal 46. The output voltage is not supplied to the output terminal 46 regardless of whether or not the current flows through the conductor 43. This output state is the same as the output state when the G lamp 45 is on. This causes G due to the disconnection failure.
The GG detection can be performed fail-safe without missing the lighting of the lamp.

The disconnection of the G lamp can be detected by checking the lighting command and the sensor output.

(Embodiment 4) FIG. 5 is a diagram showing the construction of an "energization detecting device" according to Embodiment 4. In FIG. In this embodiment, a plurality of electric variable sensors of the first and second embodiments are concentrated, and the signals of the output coils of each sensor are logically calculated and output.

In FIG. 6, (a) is a diagram showing the arrangement and connection of the detection terminals of each sensor, and (b) and (c) are diagrams showing the arrangement relationship between each sensor and the detection terminals on the printed circuit board. Is. As shown in (a), the detection terminal 5
The conductor 53 connecting 1, 52 is a saturable amorphous core 54.
And the conductor 53 constitutes a one-turn detection coil. The input coil and the output coil wound around the core 54 are not shown. Ten sensors of this configuration are centrally arranged as shown. This one
The 0 sensors are arranged on the printed circuit board as shown in (c), and are connected to the terminal board or the detection terminals.
The correspondence is shown by the arrow in (b).

Each load to be energized is connected in series to the detection terminal 52 of (a) and each detection terminal on this side,
A driving power supply to each of the loads is connected to the detection terminal 51 and each detection terminal on this side.

The signal from the output coil of each sensor is input to a logic circuit (not shown), and the output of this logic circuit is output to output terminals 55 and 56.

The logic circuit is an OR circuit when detecting the energization of any load, and is an AND circuit when detecting the simultaneous energization of a plurality of loads. To do.

In the present embodiment, since the sensors of the first and second embodiments are used, it is easy to reduce the size and cost and to provide a fail-safe structure, although a plurality of sensors are centrally arranged. Further, the desired energization condition can be detected by an appropriate logic circuit.

(Modification) In each of the above embodiments, a normal printed circuit board is used, but the present invention is not limited to this, and a flexible printed circuit board can be used. Further, although the saturable amorphous core is used in each of the embodiments, the present invention is not limited to this, and the saturable core of an appropriate material may be used.

In the case of the voltage sensor, the current limiting element connected in series to the detection coil is not limited to a resistor, but an appropriate element such as an inductance, a capacitor or a transistor constant current circuit can be used.

[0047]

As described above, according to the present invention,
It is possible to provide an electrical variable sensor that is easy to reduce in size and cost, and an energization detection device that uses this electrical variable sensor and that has a Feehler safe configuration.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment.

FIG. 2 is a diagram showing the structure and characteristics of a saturable reactor using a saturable amorphous material.

FIG. 3 is a diagram showing a configuration of a second embodiment.

FIG. 4 is a diagram showing a configuration of a third embodiment.

FIG. 5 is a diagram showing a configuration of a fourth embodiment.

FIG. 6 is a diagram showing a configuration of a conventional example.

[Explanation of symbols]

 1,3 Single-sided printed circuit board 4 Saturable amorphous core 9 Conductor 10 Through hole

Claims (6)

[Claims] 1. A plate-shaped saturable core forming a magnetically closed circuit, and two sheets forming the input coil and the output coil by sandwiching the saturable core from both sides and forming a print pattern and a through hole. 2. An electric variable sensor, comprising: the single-sided printed circuit board and a detection coil made of a conductor that penetrates the inside of the saturable core. 2. A plate-shaped saturable core forming a magnetically closed circuit, and the saturable core sandwiched from both sides thereof to form an input coil, an output coil, and a detection coil by a printed pattern and through holes. An electrical variable sensor, comprising: two single-sided printed circuit boards constituting the electrical variable sensor. 3. A single-sided printed circuit board that constitutes a part of each of an input coil and an output coil by a print pattern and a through hole, and is arranged on a surface of the single-sided printed circuit board on which the print pattern is not formed. A plate-like saturable core forming a magnetically closed circuit and a saturable core that is mounted in a through hole of the single-sided printed circuit board across a part of the saturable core and constitutes the other part of the input coil.
A first coil member of the IP package type and a second coil of the DIP package type, which is mounted in a through hole of the single-sided printed circuit board across another part of the saturable core and constitutes the other part of the output coil. An electrical variable sensor, comprising: a coil member; and a detection coil formed of a conductor that penetrates the inside of the saturable core. 4. A single-sided printed circuit board that constitutes a part of each of an input coil, an output coil, and a detection coil by a printed pattern and a through hole, and is arranged on a surface of the printed circuit board on which the printed pattern is not formed. A plate-shaped saturable core forming a magnetically closed circuit, and a DIP package that is mounted in a through hole of the single-sided printed circuit board across a part of the saturable core and forms the other part of the input coil. A first coil member having a shape;
A second coil member having the same configuration as the first coil member and configuring the other part of the output coil, and another component of the detection coil having the same structure as the first coil member. An electrical variable sensor, comprising: 5. An energization detection device, wherein the detection coil of the electrical variable sensor according to claim 1 or 3 is connected in series to a load. 6. A plurality of electrical variable sensors according to claim 1 or 3, and a logic circuit for performing a logical operation according to signals from respective output coils of the plurality of electrical variable sensors. An energization detection device characterized by the above.