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Method for effectively solving in-phase interference of contactor and microcontroller

A microcontroller and contactor technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of unclear interference types in circuits, differential mode noise oscilloscope observation, and unsatisfactory processing effects, etc., to achieve wide application, Improved reliability and low cost

Inactive Publication Date: 2013-11-20
XUCHANG UNIV
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AI Technical Summary

Problems solved by technology

Due to the complex types of noise sources, common mode noise, differential mode noise, surge noise and environmental noise often work together, and differential mode noise cannot be observed with an oscilloscope. Engineers often cannot figure out the type of interference when designing circuits, and the noise cannot be handled. When, taking care of one thing and losing another, the treatment effect is very unsatisfactory

Method used

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  • Method for effectively solving in-phase interference of contactor and microcontroller
  • Method for effectively solving in-phase interference of contactor and microcontroller
  • Method for effectively solving in-phase interference of contactor and microcontroller

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Embodiment Construction

[0035] Such as figure 1 , figure 2 , image 3 As shown, an effective method to solve the in-phase interference between the contactor and the microcontroller, the solution to the in-phase interference between the contactor and the microcontroller is realized by designing a noise processing circuit and performing noise processing;

[0036] Designing noise processing circuits includes the following procedures:

[0037] First of all, the power supply system contains high-frequency noise generated when the contactor is working. After being filtered by the first capacitor network, it is sent to the choke coil. After the differential mode noise is suppressed by the choke coil, it passes through the second capacitor network again. The high-frequency noise is filtered again, and the alternating current after two times of capacitor network filtering and choke coil processing is rectified by a set of diodes to become direct current, and then stabilized by a large-capacity polar capaci...

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Abstract

The invention relates to a method for effectively solving in-phase interference of a contactor and a microcontroller and solves the in-phase interference of the contactor and the microcontroller through designing a noise processing circuit. Before an alternating current power supply passes through a bridge rectifier circuit, high-frequency noise and differential mode noise in the alternating current are removed through a capacitance network and a choking coil; after the voltage subjected to high-frequency noise and differential mode noise filtering passes through inductance and capacitance networks, rest high-frequency interference signals and common-mode noise in the current are removed, and the voltage supplies electricity to an MCU (micro control unit); and a TVS (transient voltage suppressor) diode is switched into the power supply end of the MCU, and the impact of surge current such as lightning and charges on a machine case is effectively inhibited. The method has the advantages that the cost is low, the application is wide, and the work is reliable.

Description

technical field [0001] The invention relates to a method for effectively solving the in-phase interference between a contactor and a microcontroller. Background technique [0002] Where large motors need to be controlled, the contactor and the controller are usually powered in the same phase and installed in the same box. The action of the contactor generates strong electromagnetic interference and noise. Coupled with the frequent start and stop of heavy machinery on the job site, a large amount of harmonics are injected into the power grid. Waves will cause problems such as microcontroller (MCU) reset, crash and display garbled characters. Through scientific circuit design and ingenious circuit arrangement, the invention well solves the problem that the contactor and microcontroller (MCU) cannot work due to the interference caused by the same phase power supply. [0003] Heavy machinery such as construction sites, ports, and docks start and stop frequently. The start and s...

Claims

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Application Information

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IPC IPC(8): H02M1/44
Inventor 张广韬张元敏赵忠彪罗书克
Owner XUCHANG UNIV
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