Electromagnetic switch feedforward feedback control module with ultra-wide working voltage

A technology of feedforward feedback and electromagnetic switch, which is applied in the direction of circuits, relays, electrical components, etc., can solve problems such as power systems that are difficult to cover, and achieve the effects of reducing specification types, suppressing coil current harmonics, and reducing high-frequency noise

Active Publication Date: 2019-01-15
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electromagnetic switches need to adapt to different power types, voltage levels, voltage ranges, etc. If only relying on the body design, even if a variety of electromagnetic mechanism specifications are used to match it, it is still difficult to cover power systems above 500V

Method used

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  • Electromagnetic switch feedforward feedback control module with ultra-wide working voltage
  • Electromagnetic switch feedforward feedback control module with ultra-wide working voltage

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Embodiment Construction

[0022] In order to make the features and advantages of this patent more obvious and easy to understand, the following special examples are described in detail as follows:

[0023] Such as figure 1 As shown, in the feedforward feedback excitation adjustment module: the first power supply (which can be DC or 50 / 60Hz AC) is filtered by the first EMI and rectified to obtain the DC bus voltage. The DC bus voltage is regulated by the first switching tube, thereby changing the average voltage applied to both ends of the coil: when the first switching tube and the second switching tube are turned on at the same time, the two ends of the coil are positive voltage, and the coil is positively excited; When the first switching tube is turned off, the second switching tube is turned on, and the coil current is freewheeling through the second switching tube, the first current sampling circuit, and the first freewheeling diode. At this time, the voltage at both ends of the coil is almost zer...

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Abstract

The invention provides an electromagnetic switch feedforward feedback control module with ultra-wide working voltage. After EMI filtering and rectifying filtering, the power supply is connected with afirst switching transistor. The first switch tube is connected to one end of the coil of the electromagnetic switch; The other end of the coil is connected with a second switch tube; The second switch tube is connected to the main control processor through the first current sampling circuit as a feedback variable; The first current sampling circuit is respectively connected with both ends of thecoil through a first freewheeling diode and a fast demagnetization circuit. After EMI filtering, rectifying and filtering, the power supply is connected to the main control processor through the second voltage sampling circuit as a feedforward variable. Feed forward variable and feedback variable form weak power PWM signal in the main control processor. The weak power PWM signal of the main control processor is transmitted to the first switch transistor through the first high voltage side floating drive circuit. As that direct current bus voltage feedforward and the coil current feedback are introduce in the invention, the power disturbance can be effectively respond to, the harmonics of the coil current can be restrained, the ripple pollution can be prevented, and the high-frequency noiseof the coil can be reduced.

Description

technical field [0001] The invention belongs to the field of electromagnetic switches, in particular to an electromagnetic switch feedforward and feedback control module with ultra-wide working voltage. Background technique [0002] Electromagnetic switches are the most widely used electrical products and are widely used in automatic control and power systems. Its structure can be attributed to two subsystems, namely the contact system and the electromagnetic system. The electromagnetic system drives the contact system to realize the on-off control of the circuit, and undertakes the tasks of distributing and transmitting electric energy, controlling or protecting loads, and directly affects The safety and stability of the power system and control system. [0003] At present, a new round of energy transformation is booming around the world. my country is developing rapidly in new energy grid connection, intelligent power distribution, electric vehicles, etc., and the demand ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44H02M1/14H02M7/217H01H47/00
CPCH01H47/00H02M1/14H02M1/44H02M7/217
Inventor 许志红庄杰榕
Owner FUZHOU UNIV
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