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Solenoid valve direct current power supply switching system and method of digital electro-hydraulic control device

A technology of control devices and DC power supplies, applied in general control systems, control/regulation systems, instruments, etc., can solve problems such as high cost and complexity, and achieve the effects of stable performance, low cost, and simple structure

Inactive Publication Date: 2019-11-01
DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the publication number is CN101846998A, and the publication time is September 29, 2010. The Chinese invention patent document named "Steam Turbine Redundant Digital Electro-hydraulic Control System" discloses a steam turbine redundant digital electro-hydraulic control system, the system includes a dual power switching device, a control unit and a man-machine interface, the control unit includes A control machine, B control machine, A group signal acquisition module, B group signal acquisition module, dual-machine switching module and multiple communication module, wherein the A control machine performs signal interaction with the steam turbine unit and the servo system through the A group signal acquisition module, and the B control machine performs signal interaction with the steam turbine unit and the servo system through the B group signal acquisition module. The A control machine and the B control machine are connected and Information interaction can be carried out with the man-machine interface through the communication module respectively. The signals of the A control machine and the B control machine are also connected to the dual-machine switching module and the information exchange is carried out with the man-machine interface through the communication module. However, this technical solution adopts a dual Control machine, circuit design based on servo control technology is also relatively complex and costly

Method used

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  • Solenoid valve direct current power supply switching system and method of digital electro-hydraulic control device

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Embodiment 1

[0030] As the most basic embodiment of the present invention, with reference to the description attached figure 1 , this embodiment discloses a digital electro-hydraulic control device solenoid valve DC power switching system, including two power inputs, and the two power inputs are connected to one or several parallel relays; and the two power inputs are both It is connected to the normally open contact of the relay connected to each other, and connected to the normally closed contact of the relay connected to the other power input; the relays at the two inputs can be connected to the two circuits through the distribution of normally closed and normally open points. Input power selection (that is, switching), and reverse connection so that the power supply circuits of the two inputs will not be powered off at the same time, ensuring the effect of switching.

Embodiment 2

[0032] As a preferred embodiment of the present invention, with reference to the attached figure 1, this embodiment discloses a digital electro-hydraulic control device solenoid valve DC power switching system, including two power inputs, and the two power inputs are connected to one or several parallel relays; and the two power inputs are both Connect with the normally open contacts of the relays connected to each other, and connect with the normally closed contacts of the relays connected to the other power input; set the two power inputs as the first power input and the second power input, and the second power input Three parallel four-contact relays are connected to one power input, and one four-contact relay is connected to the second power input; the three parallel four-contact relays connected to the first power input are defined as DR1 and DR2 and DR4, a parallel four-contact relay connected to the second power supply input is DR3, and the coils of the four four-contac...

Embodiment 3

[0034] As yet another embodiment of the present invention, refer to the attached figure 1 , this embodiment discloses the switching method of the solenoid valve DC power switching system of the digital electro-hydraulic control device:

[0035] Set the two power inputs as the first power input and the second power input;

[0036] The first power input is energized, the relay coil connected to the first power input is charged, the normally open contact is closed and the normally closed contact is disconnected, so that the normally open contact circuit of the relay connected to the first power input Use the first power supply input as the power supply to form a power supply path;

[0037] The first power supply input is powered off, the relay coil connected to the first power input is de-energized, the normally open contact is opened and the normally closed contact is closed, so that the normally closed contact of the relay connected to the first power input The point line is ...

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Abstract

The invention relates to a solenoid valve direct current power supply switching system and method of a digital electro-hydraulic control device, and relates to the field of power supply switching control technology. The system comprises two paths of power supply input; each power supply input is connected with one or a number of parallel relays; each power supply input is connected with the normally open contact of the respective connected relay; and the other one power supply input is connected with the normally closed contact of the connected relay. The system satisfies the requirement of the direct current power supply switching device of the digital electro-hydraulic control device by using low cost.

Description

technical field [0001] The invention relates to the technical field of power switching control, and more specifically relates to a digital electro-hydraulic control device solenoid valve DC power switching system and its method. Background technique [0002] With the development of microprocessor-based distributed control system (DCS) technology, using the design idea of ​​decentralized control and centralized management, not only the reliability of automatic control has been greatly improved, but also the operation and maintenance personnel can be greatly reduced labor intensity. [0003] In the prior art, the publication number is CN101846998A, and the publication time is September 29, 2010. The Chinese invention patent document named "Steam Turbine Redundant Digital Electro-hydraulic Control System" discloses a steam turbine redundant digital electro-hydraulic control system, the system includes a dual power switching device, a control unit and a man-machine interface, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B9/03
CPCG05B9/03
Inventor 张耀
Owner DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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