JP2000021661A - Ct type current sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small and thin current sensor by assembling a thin coil having a pattern coil formed or mounted on a substrate into a magnetic core as a secondary winding and detecting a current flowing through the primary conductor by the secondary winding. SOLUTION: The CT type current sensor comprises a thin coil 1 assembled into a magnetic core 5 as a secondary winding and a current flowing through a primary conductor pattern 4 is detected by the secondary winding. The thin film coil 1 has an insulating polymer film having a pair of openings 1a, 1b passing the frame end of each core part and bonded spirally around the openings 1a, 1b while matching the winding direction of a conductive wire. A laminate substrate 2 having a pair of pattern coil 3 serving as a secondary winding is formed by laminating the thin coils 1 and then a conductor pattern 4 is formed thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CT type current sensor applied to current detection of a device to be controlled in a control system using, for example, a power regulator, an SSR, and the like. The present invention relates to a CT type current sensor which can be easily incorporated in the power regulator, SSR, and the like.

[0002]

2. Description of the Related Art For example, a power regulator capable of detecting a plurality of heater disconnections by phase control is provided by a CT type current sensor which is attached to the outside of the power regulator and arranged for each heater in a heater device to be subjected to disconnection detection. Each of the heaters detects current, and based on each detected current value, the presence or absence of disconnection of each heater is detected.

[0003]

However, when a CT type current sensor is arranged outside the power regulator as in the prior art, it is troublesome to wire between the power regulator and the CT type current sensor. It takes.

On the other hand, in the conventional CT type current sensor, a secondary winding is formed by winding a conductive wire around a magnetic core, so that the secondary winding cannot be further reduced in size. ,
It has been difficult to reduce the size of the entire sensor.

[0005] For this reason, in the conventional case, if a configuration in which the CT type current sensor is incorporated in the power regulator is adopted, the space occupied by the CT type current sensor in the power regulator becomes large. Further, there has been a problem that it is not possible to cope with a request to reduce the size or to avoid a request to increase the size.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the size and thickness of the device.
For example, an object of the present invention is to provide a CT-type current sensor that can be easily incorporated in a power regulator, an SSR, or the like.

[0007]

According to a first aspect of the present invention, a thin coil having a structure in which a pattern coil is formed or mounted on a substrate is incorporated in a magnetic core as a secondary winding. And a CT-type current sensor characterized in that a current flowing through the primary conductor is detected by the secondary winding.

According to the first aspect of the present invention, the configuration of the CT-type current sensor for detecting the current flowing through the primary-side conductor with the secondary-side winding is ensured, and the secondary-side current winding is detected. In order to compose a wire, a thin coil having a structure in which a pattern coil is formed or mounted on a substrate is incorporated in a magnetic core. An easy CT type current sensor could be provided.

According to a second aspect of the present invention, in the CT type current sensor, a conductor pattern for primary side output is formed or mounted on a substrate surface on which the pattern coil is formed or mounted. 2. The magnetic core according to claim 1, wherein a thin coil having a substrate-integrated structure in which a pattern coil serving as a secondary winding and a primary conductor pattern are present on the same surface is incorporated in the magnetic core. In the CT-type current sensor described above.

According to the invention described in claim 2 of the present application, a pattern coil serving as a secondary winding and a primary-side conductor pattern can be formed or mounted on a common substrate. As a result, the CT type current sensor can be further reduced in size and thickness.

According to a third aspect of the present invention, in the CT type current sensor, the thin coil and a thin component on which a primary conductor pattern is formed or mounted are mounted on the magnetic core. The C coil according to claim 1, wherein the pattern coil to be incorporated and a secondary winding and the conductor pattern on the primary side have a component type configuration that exists independently of each other.
In a T-type current sensor.

According to the invention as set forth in claim 3 of the present application, the CT-type current sensor has a thin coil and a thin component incorporated in a magnetic core, and has a pattern coil serving as a secondary winding. , And the primary-side conductor pattern are configured as component types that exist independently of each other.
Type current sensor can be easily manufactured.

According to a fourth aspect of the present invention, in the CT-type current sensor, the thin coil and a circuit board of a device on which the sensor is mounted are incorporated in the magnetic core. The CT-type current sensor according to any one of claims 1 to 3, wherein the sensor is mounted on a circuit board of a device to be mounted.

According to the invention described in claim 4 of the present application, for example, a configuration in which the CT type current sensor of the present invention is mounted on a circuit board of a device to be mounted such as a power regulator and an SSR. Therefore, the CT type current sensor of the present invention can be easily built in the device to be mounted.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view schematically showing a completed CT type current sensor according to an embodiment of the present invention, and FIG. 2 is a schematic view showing a state in which the CT type current sensor shown in FIG. 1 is being assembled. FIG. 3 shows details of the laminated structure of the thin coil. In the figure, 1 is a thin coil, 2 is a laminated substrate, 3
Denotes a pattern coil, 4 denotes a conductor pattern, and 5 denotes a magnetic core.

This CT type current sensor has a thin coil 1
Is incorporated in the magnetic core 5 as a secondary winding, and the current flowing through the primary-side conductor pattern 4 is detected by the secondary winding.

The magnetic core 5 has a structure in which a rectangular frame made of a magnetic material is divided into a core part 5A and a core part 5B as shown in FIG. , 5B are joined by abutting the frame ends 5a and 5b, and the periphery of the joint is fixed with an adhesive to form a magnetic closed loop.

As shown in FIG. 3A, the thin coil 1 is made of an insulating polymer film having a pair of openings 1a and 1b through which the frame ends 5a and 5b of the core parts 5A and 5B can be inserted. Unit films 2a to 2n formed by forming a conductive wire spirally around openings 1a and 1b as a base material
Are bonded with a conductive adhesive so that the winding direction of the spiral conductive wire is the same, and laminated while being folded,
As shown in FIG. 1B, after forming a laminated substrate 2 having a pair of pattern coils 3 serving as secondary windings, FIG.
As shown in FIG. 2, a conductor pattern 4 is formed on a laminated substrate 2.

As described above, the thin coil 1 has the conductor pattern 4 for primary output formed on the substrate surface on which the pair of pattern coils 3 serving as secondary windings are formed. The pattern coil 3 and the conductor pattern 4 serving as a primary output line have a substrate-integrated configuration on the same surface.

For this reason, as in this embodiment, a pair of openings 1a, 1b through which the frame ends 5a, 5b of the respective core components 5A, 5B can be formed are formed in the thin coil 1, and the magnetic core 1 By making 5 a two-part structure,
For example, the frame ends 5a, 5b of the core component 5A are inserted into the openings 1a, 1b.
Is inserted and joined to the corresponding frame end of the other core component 5B by abutting, and the periphery of the joined portion is fixed with an adhesive. The CT type current sensor to be detected can be constructed small and thin.

FIG. 4 shows a simplified circuit diagram of an equivalent circuit configuration of the CT type current sensor. FIG.
, 6 is a secondary winding composed of the pattern coil 3;
Reference numeral 7 denotes a primary-side conductor made of the conductor pattern 4, reference numeral 8 denotes a shunt resistor, and a combination of the secondary winding 6 and the primary-side conductor 7 corresponds to the configuration in FIG.

FIG. 5 is a perspective view showing a schematic configuration of a CT type current sensor according to another embodiment of the present invention, and FIG. 6 shows a process of assembling the CT type current sensor of FIG.

This CT type current sensor has a thin component 9 forming a separately prepared conductor pattern 4 and a thin coil 1A having a configuration in which the conductor pattern 4 is omitted from the thin coils shown in FIGS. And the core components 5C and 5D constituting the magnetic core 5 forming a rectangular frame are assembled as follows.

The core component 5C is a straight quadrangular prism, and the core component 5D is a quadrangular prism with raised protrusions at both ends. The magnetic core 5 which forms a rectangular frame can be formed by combining the core components 5C and 5D. In this example, as shown in FIG. 6A, the frame ends 5a and 5b of the core component 5D are inserted into the pair of openings 1a and 1b of the thin coil 1A, and the core component 5D is inserted into the core component 5C without any gap. It is joined, and the periphery of this joint is fixed with an adhesive.

Next, the assembly of the thin coil 1A and the core parts 5C and 5D as shown in FIG. 2B is transferred to a mounting step for assembling the thin parts. A thin component 9 as shown in FIG. 9C is fitted into the component 5D from the side and fixed by soldering. In this example, grooves 9a and 9b for insertion slightly larger than the frame width of the core component 5D are formed in the thin component 9, and the core component 5D is fitted into the grooves 9a and 9b.

As described above, the CT-type current sensor incorporates the thin coil 1a on which the pattern coil 2 is formed and the thin component 9 on which the conductor pattern 4 is formed into the magnetic core 5, and forms the primary conductor pattern 4 on the primary side. And the pattern coil 2 on the secondary side are independent parts.

For this reason, as in this embodiment, the magnetic core 5 has a two-part structure composed of core parts 5C and 5D.
The frame ends 5a, 5b of the core components 5C, 5D are provided in the thin coil 1.
A pair of openings 1a and 1b through which the core components 5C and 5D can be fitted are formed in the thin component 9, and a core such as a core is formed in the openings 1a and 1b. The frame ends 5a and 5b of the component 5D are inserted, butted against the corresponding portion of the other core component 5C and joined without gaps,
A CT-type current sensor that detects the current flowing through the primary-side conductor pattern 4 with the pattern coil 2 that is the secondary winding by a simple operation of simply fixing the periphery of this joint portion with an adhesive is small and thin. Can be easily constructed.

In addition, since the CT type current sensor can be constructed small and thin, it is mounted on the circuit board 10 of a device to be mounted such as a power regulator and an SSR as shown in FIG. The CT type current sensor 11 having the configuration described above can be constructed. This CT type current sensor 11 has a configuration of a modified example of the embodiment shown in FIG. 5, and the thin coil 1 </ b> A and the circuit board 10 of the device to be mounted are formed of a magnetic core in the relationship described with reference to FIG. 6. 5, the control output electric circuit (conductor pattern) 4A of the circuit board 10 of the device to be mounted is a primary conductor, and the pattern coil 2 of the thin coil 1A is a secondary winding. . In FIG. 7, reference numeral 12 denotes a control signal output line connected to a device to be controlled (not shown), and reference numeral 13 denotes a sensor detection signal output line.

Since such a CT-type current sensor is mounted on a board, it can be easily incorporated in a power regulator or the like, and the space occupied by the power regulator or the like can be reduced.

In each of the above embodiments, a pattern coil or a conductor pattern is formed on a substrate by a printing method or the like to form a thin coil or a thin component. May be implemented to form a thin coil or the like.

[0032]

As is apparent from the above description, according to the present invention, a small and thin type power regulator, SSR
Thus, it is possible to provide a CT-type current sensor that can be easily incorporated in a device.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a completed state of a CT type current sensor according to an embodiment of the present invention.

FIG. 2 is a perspective view schematically showing a state in which the CT type current sensor of FIG. 1 is being assembled.

FIG. 3 is a diagram showing details of a laminated structure of a thin coil.

FIG. 4 is a simplified circuit diagram showing an equivalent circuit configuration of a CT type current sensor.

FIG. 5 is a perspective view showing a schematic configuration of a CT-type current sensor according to another embodiment of the present invention.

FIG. 6 is an explanatory view showing a process of assembling the CT-type current sensor of FIG. 5;

FIG. 7 is a perspective view showing a schematic configuration of a modified example of the CT-type current sensor according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Thin coil 1a, 1b Opening 2 Laminated substrate 3 Pattern coil 4 Conductor pattern 4A Control output circuit (conductor pattern) 5 Magnetic core 5A to 5D Core parts 5a, 5b Frame end 6 Primary winding 7 Secondary side 8 Shunt resistor 9 Thin parts 9a, 9b Groove for fitting 10 Circuit board 11 CT current sensor of the present invention 12 Control signal output line 13 Sensor detection signal output line

Claims (4)

[Claims] 1. A thin coil having a structure in which a pattern coil is formed or mounted on a substrate is incorporated in a magnetic core as a secondary winding, and a current flowing through the primary conductor is detected by the secondary winding. A CT-type current sensor, characterized in that: 2. A pattern coil which forms or mounts a conductor pattern for primary output on a substrate surface on which the pattern coil is formed or mounted, and a pattern coil which becomes a secondary winding, 2. The magnetic core according to claim 1, wherein a thin coil having a substrate integral structure in which a conductor pattern on the primary side is present on the same substrate is incorporated in the magnetic core.
4. The CT type current sensor according to claim 1. 3. The CT-type current sensor is characterized in that the thin coil and a thin component on which a primary conductor pattern is formed or mounted are mounted on the magnetic core to form a secondary winding. 2. The CT-type current sensor according to claim 1, wherein the coil and the conductor pattern on the primary side have a component type configuration that exists independently of each other. 4. The CT-type current sensor incorporates the thin coil and a circuit board of a device on which the sensor is to be mounted into the magnetic core, and forms the thin coil on a circuit board of the device to be mounted. The CT-type current sensor according to any one of claims 1 to 3, wherein the CT-type current sensor is configured to include a sensor.