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Solenoid drive

A driving device and electromagnet technology, applied in the direction of electromagnets, electromagnets, circuits, etc. with armatures, can solve the problem of high sampling frequency, and achieve the effects of low sampling frequency, clear effect and power loss suppression

Active Publication Date: 2018-12-14
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if this method is used, there is a problem that, when the pulse width of the applied voltage pulse to the electromagnet is narrow or the pulse period is short, the sampler has to be used for detection by a microcomputer. High-performance and expensive microcomputer with high frequency

Method used

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  • Solenoid drive
  • Solenoid drive
  • Solenoid drive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0029] figure 1 It is a circuit diagram showing the configuration of the electromagnet drive device according to Embodiment 1 of the present invention.

[0030] exist figure 1 , the electromagnet 1 is connected to the switching element 2. When the switching element 2 is in the conductive state, a DC power supply voltage is applied to the electromagnet 1 from the winding power supply circuit 3 . When the switching element 2 is in the ON state, the excitation current flows through the excitation current detection resistor 4 , and a voltage drop proportional to the magnitude of the excitation current occurs across the excitation current detection resistor 4 . The freewheel diode 5 is connected in parallel to the electromagnet 1 in order to make an exciting current flow through the electromagnet 1 by utilizing the electromotive force generated in the electromagnet 1 when the switching element 2 is non-conductive. That is, a loop is formed by the electromagnet 1 and the freewhee...

Embodiment approach 2

[0051] Next, an electromagnet driving device according to Embodiment 2 of the present invention will be described.

[0052] Figure 7 It is a circuit diagram showing the configuration of the electromagnet driving device according to the second embodiment. Embodiment 2 shows another embodiment of the field current control unit 6a in Embodiment 1, and has various effects similar to Embodiment 1.

[0053] exist Figure 7 Among them, the excitation current control part 6b has: a control microcomputer 13b, which utilizes the pulse control of the switching element 2 to implement the energization of the iron core of the electromagnet 1 to maintain the required excitation current; the control power supply 14 of the control microcomputer 13b; the power supply voltage measurement circuit 10, It measures the DC power supply voltage of the winding power supply circuit 3; the pulse driving circuit 12b, which performs pulse control on the switching element 2; The switching element 2 is p...

Embodiment approach 3

[0066] Next, an electromagnet driving device according to Embodiment 3 of the present invention will be described.

[0067] Figure 11 It is a circuit diagram showing the configuration of the electromagnet driving device according to the third embodiment. Embodiment 3 is a different embodiment of the field current control unit 6a in Embodiment 1, and has various effects similar to those in Embodiment 1. As shown in FIG.

[0068] exist Figure 11 Among them, the excitation current control part 6c is made up of the following components: the control microcomputer 13b, which implements the energization of the iron core of the electromagnet 1 through the pulse control of the switching element 2 to maintain the required excitation current; the control power supply 14 of the control microcomputer 13b; the power supply voltage Measuring circuit 10, which measures the DC power supply voltage of winding power supply circuit 3; pulse drive circuit 12a, which performs pulse control on s...

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Abstract

The present invention relates to an electromagnet driving device, which has a control microcomputer (13a, 13b) that controls the excitation current of an electromagnet (1) via a switching element (2). The control microcomputer (13a, 13b) when the iron core of the electromagnet (1) attracts the initial stage and the iron core attracts again, according to the voltage drop proportional to the magnitude of the excitation current of the electromagnet (1) and the voltage applied to the electromagnet (1) The DC power supply voltage is calculated for the winding resistance value of the electromagnet (1), and the pulse control of the DC power supply voltage is performed based on the calculated winding resistance value. The power supply voltage is converted into a pulse voltage and applied to the electromagnet (1).

Description

technical field [0001] The present invention relates to an electromagnet driving device for driving an electromagnet built in a circuit breaker or the like. Background technique [0002] The electromagnet driving device that attracts the electromagnet built in the circuit breaker, etc. is controlled as follows. In the initial stage of attraction, a large excitation current is energized to the winding due to the relationship between the magnetic circuit gap, and after the core is attracted, the magnetic circuit gap becomes smaller. Therefore, the excitation current is lowered and energized to maintain the attraction state. [0003] In the above-mentioned electromagnet driving device, as the means for reducing the excitation current after the iron core is attracted, a pulse-shaped voltage is applied to the electromagnet, and the excitation current generated by the counter electromotive force of the electromagnet is passed through the electromagnet during the period when no vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F7/18H01H71/24
CPCH01H33/59H01H47/325H01H47/04
Inventor 松田和久林明宏
Owner MITSUBISHI ELECTRIC CORP