JPH0247556A - Dc detecting apparatus and dc-detection controlling apparatus - Google Patents

Abstract

PURPOSE:To detect a DC effectively and to perform various controls by winding a lead wire around an iron core, detecting magnetic flux generated in response to the current with a magnetism detecting part, and supplying an operating signal into a part to be controlled with an operating part which is connected to said detecting part. CONSTITUTION:A lead wire is wound around an iron core, and a current- magnetism transducer part 10 is formed. Magnetic flux which is generated when a current flows through the current-magnetism transducer part 10 is detected with a magnetism detecting part 20 which is arranged in the vicinity of the iron core. One terminal thereof is connected to a control current 40. ON/OFF control or proportional control is performed for the current from the control current 40. The other terminal of the part 20 is connected to an operation control part 30 which is operated in response to the operation of said detecting part 20 and generates an operating signal. In this way, a high- performance DC detecting apparatus which effectively utilizes the magnetic field caused by the DC with a simple constitution and to perform various controls based on the magnetic field can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a current detector, and particularly to a DC current detector that detects a DC current using a DC magnetic field based on a DC current, and a method using this DC current detector. The present invention relates to a DC current detection control device that enables control.

[Background Art] Generally, various types of detectors have been proposed for detecting alternating current using the magnetic effect of alternating current. However, it is difficult to efficiently detect direct current using its magnetic effect.

As means for detecting direct current, a current detection resistor is connected in the direct current circuit and a voltage drop based on the current flowing through this resistor is detected.

[Issue g to be solved by the invention] With the means of inserting and connecting a current detection resistor into a current loop and detecting direct current based on the voltage drop, power loss occurs and heat is generated. This is contrary to interest, especially as other electrical components are becoming increasingly low-power. Also,
In precision electrical equipment, the performance of the equipment deteriorates due to heat generation.

The present invention has been made in view of the above-mentioned problems, and its purpose is to effectively utilize the magnetic field generated by direct current,
It is an object of the present invention to provide a DC current detector that can effectively detect DC current, and to provide a DC current detection I control device that enables various controls based on the detection signal of this DC current detector.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a current-magnetism system in which a lead wire for passing a direct current is wound around an iron core, and generates magnetism in response to the direct current. A DC current detection device is constituted by a magnetic detection section including a conversion section and a magnetic detection element that is arranged near the iron core of the current-magnetic conversion section and detects magnetism generated by the current-magnetic conversion section.

In addition, there is a current-magnetic conversion section which is made by winding a lead wire for passing a direct current around an iron core and generates magnetism in response to the direct current, and a current-magnetic conversion section which is arranged near the iron core of this current-magnetic conversion section. A magnetic detection unit consisting of a magnetic detection element that detects the magnetism generated by the magnetic conversion unit, and an operation 41711 that operates in response to the operation of the magnetic detection unit and generates an activation signal.
One part constitutes a direct current detection control device.

[Function] When direct current flows through the lead wire, magnetic flux is generated through the iron core in response to this current. The magnetic detection unit detects this magnetism and operates, and you receive $! Supplies control current to the operation control section. As a result, the operation control section operates and supplies an operation signal to the controlled section.

[Example] Examples of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, 10 is a current-magnetic converter that converts direct current into a magnetic signal, 20 is a magnetic detector that detects the magnetism generated from the current-magnetic converter 10, and turns on the current from the control current 40. Off control or proportional control. Reference numeral 30 denotes an operation control section that operates in response to a controlled current that operates in response to the IIJ controlled current that responds to the detection operation of the magnetic detection section 20, and generates an operating signal.

FIG. 2 shows an embodiment of the DC current detection and control device of the present invention, in which a predetermined number of lead wires 12 for flowing DC current are wound around a cylindrical core 11 made of pure iron.
A magnetic transducer 10 is formed. A reed switch 21 is provided near the end of the iron core 11 as a magnetic detection section 20 . The movable contact 22 of the reed switch 21 is connected to one power terminal of the control power source 40. Further, the fixed contact 23 of the reed switch 21 is connected to the other power terminal of the control power source 40. A control relay 31 is connected between the fixed contact 23 of the reed switch 21 and the 'I11# power supply 40.
A coil 32 is connected to the coil 32 and a $ control power source 40.
A contact 33 of a control relay 31 is connected to the connection point with the control relay 31. I! consisting of these coils 32 and contacts 33! The control relay 31 forms an operation control section 30, and this operation control section 30 generates an operation signal for other circuits to be connected.

According to the DC current detection Il#lI device having the above configuration, when the DC current Id, which is the current to be detected, flows, the iron core 11 is magnetized in the current-magnetic conversion section 10, and in response, the lead of the magnetic detection section 20 is magnetized. Switch 21 is turned on. When the reed switch 21 is turned on, a current loop consisting of the control power source 40, the reed switch 21, and the operation control section 30 is formed, and a current 1a flows through the loop. As a result, the 11 control relay 31 is energized and the contact 33 is turned on, and the operation control section 30 generates the operation signal Sa to control the operation of the i-controlled target (not shown).

Regarding the current-magnetic converter 10, the voltage of the DC power supply is 1
When the voltage is 2V and the current is 2OA or 24V and 30A, corresponding magnetism is generated.

This magnetism acts on the reed switch 21 to turn it on. Therefore, unlike a current detection resistor, the voltage does not drop and power loss does not occur. Furthermore, there is no heat generation, and there is no adverse effect on the performance of other electrical components. In the above embodiment, a reed switch was used as the magnetic detection element of the magnetic detection section, but in the present invention, various magnetoelectric conversion elements such as Hall elements, magnetoresistive elements, magnetic diodes, and magnetic transistors are used as the magnetic detection element. You can.

[Effects of the Invention] The present invention is as described above, and includes a current-magnetic converter that is formed by winding a lead wire for passing a direct current around an iron core and generates magnetism in response to the direct current, and a current-magnetic converter that generates magnetism in response to the direct current. Since the direct current detection device is constituted by a magnetic detection section consisting of a magnetic detection element that is placed near the iron core of the magnetic conversion section and detects the magnetism generated by the current-magnetic conversion section,
The magnetic effect of direct current can be effectively utilized, and a high-performance direct current detection device can be obtained with a simple configuration, small size, and low cost. In addition, there is a current-magnetic conversion section which is made by winding a lead wire for passing a direct current around an iron core and generates magnetism in response to the direct current, and a current-magnetic conversion section which is arranged near the iron core of this current-magnetic conversion section. Direct current detection I! is performed by a magnetic detection section consisting of a magnetic detection element that detects the magnetism generated by the magnetic conversion section, and an operation fA control section that operates in response to the operation of the magnetic detection section and generates an operation signal. Since it constitutes a control device, it is possible to obtain a direct current detection device that can effectively control not only high-power electrical devices but also small-power electrical devices, and its technical effects are great. be.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram of a DC current detection device and a DC current detection Il'IIl device of the present invention, and FIG. 2 is a block diagram of a DC current detection control device according to an embodiment of the present invention.
10 is a DC current detection unit, 11 is an iron core, 12 is a lead wire,
20 is a magnetic detection section, 21 is a reed switch, 30 is an operation control section, 31 is an operation relay, 32 is a coil of the operation relay, and 33 is a contact point of the operation relay.

Claims (2)

[Claims] (1) A current-to-magnetic converter that is made by winding a lead wire around an iron core for passing a direct current and generates magnetism in response to the direct current; - A direct current detection device characterized by comprising a magnetic detection section comprising a magnetic detection element that detects magnetism generated by a magnetic conversion section. (2) A current-to-magnetic converter that is made by winding a lead wire for passing a direct current around an iron core and generates magnetism in response to the direct current; - It is characterized by being constituted by a magnetic detection section consisting of a magnetic detection element that detects the magnetism generated by the magnetic conversion section, and an operation control section that operates in response to the operation of the magnetic detection section and generates an operation signal. DC current detection control device.