CN204867869U - Turn over and swash small -size electric welding of formula based on UC3842 - Google Patents

Abstract

Translated fromChinese

本实用新型提供了一种基于UC3842的反激式小型电焊机，属于焊机领域，包括主电路和控制两部分，主电路包括整流模块、滤波模块、高频变压器模块；整流模块把交流电转换成脉动直流电；滤波模块是滤除脉动直流电压中交流；控制部分包括主控制器、PWM模块、电流反馈模块、电压反馈模块、执行模块；主控制器用UC3842对整个电路进行系统分析、逻辑判断和实时控制；PWM模块通过改变占空比对开关管控制；电流反馈模块通过对电流变化采样进而控制PWM的占空比；电压反馈模块通过对电压变化的采样进而控制PWM的占空比；执行模块通过改变开关器件开、关时间比，控制变压器的状态；本实用新型可以使电焊机在输出时无论过压、欠压，还是过流、欠流，都能自动的控制和调节使焊机恢复正常工作状态。

The utility model provides a flyback small-sized electric welding machine based on UC3842, which belongs to the field of welding machines and includes two parts: a main circuit and a control part. The main circuit includes a rectification module, a filter module and a high-frequency transformer module; Pulsating direct current; the filter module is to filter out the alternating current in the pulsating direct current voltage; the control part includes the main controller, PWM module, current feedback module, voltage feedback module, and execution module; the main controller uses UC3842 to conduct system analysis, logic judgment and real-time Control; the PWM module controls the switching tube by changing the duty ratio; the current feedback module controls the duty ratio of the PWM by sampling the current change; the voltage feedback module controls the duty ratio of the PWM by sampling the voltage change; the execution module passes Change the on-off time ratio of the switch device to control the state of the transformer; the utility model can automatically control and adjust the welding machine to return to normal regardless of over-voltage, under-voltage, or over-current or under-current during output. working status.

Description

Translated fromChinese

一种基于UC3842的反激式小型电焊机A Flyback Small Electric Welder Based on UC3842

技术领域technical field

本实用新型属于电焊机领域，具体涉及一种基于UC3842的反激式小型电焊机。The utility model belongs to the field of electric welding machines, in particular to a flyback small electric welding machine based on UC3842.

背景技术Background technique

在现代工业中，电焊机是不可或缺的工艺设备。电焊机在机械生产及工业领域中拥有重要的地位，具有工业缝纫机的美称。在工业生产中，电焊机输出的稳定性是必要的，因为焊接技术是一种精确、可靠、永久性的金属加工方法，电焊机的核心部分是电源，它的质量好坏会直接影响到焊接的质量、可靠性和工作效率，有时甚至关系工程安全问题。市场上的电焊机输出是不稳定的，在需要的电流大小情况下，不能稳定下来，往往会出现过流、欠流和过压、欠压的情况，导致焊接口出现质量问题。In modern industry, welding machine is an indispensable process equipment. Welding machines play an important role in mechanical production and industrial fields, and are known as industrial sewing machines. In industrial production, the stability of the output of the electric welding machine is necessary, because the welding technology is a precise, reliable and permanent metal processing method. The core part of the electric welding machine is the power supply, and its quality will directly affect the welding Quality, reliability and work efficiency, and sometimes even related to engineering safety issues. The output of the electric welding machine on the market is unstable. Under the condition of the required current, it cannot be stabilized. Over-current, under-current and over-voltage and under-voltage often occur, resulting in quality problems at the welding joint.

针对以上所述情况，本文设计了一种自动调节输出的电焊机系统，当输出出现偏差或异常时，自动调节输出使其在稳定状态中。In view of the above situation, this paper designs a welding machine system that automatically adjusts the output. When the output deviates or is abnormal, the output is automatically adjusted to make it in a stable state.

发明内容Contents of the invention

本实用新型的目的是提供一种基于UC3842的反激式小型电焊机，使输出稳定化，从而提高焊接的质量。The purpose of this utility model is to provide a small flyback electric welding machine based on UC3842, which can stabilize the output and improve the quality of welding.

为了达到上述目的，本实用新型所采用的技术方案为：In order to achieve the above object, the technical solution adopted in the utility model is:

一种基于UC3842的反激式小型电焊机，包括主电路和控制两部分，主电路部分包括整流模块、滤波模块、高频变压器模块、整流模块、滤波模块。控制部分包括UC3842主控制器,所述UC3842主控制器上连接模块包括PWM模块、电流反馈模块、电压反馈模块、执行模块，所述PWM模块与UC3842主控制器和执行模块连接；所述电流反馈模块与UC3842主控制器和变压器初级侧连接；所述电压反馈模块与线性耦合和电焊机输出端连接；所述执行模块与PWM模块和变压器初级侧连接。A small flyback electric welding machine based on UC3842, including a main circuit and a control part. The main circuit part includes a rectifier module, a filter module, a high-frequency transformer module, a rectifier module, and a filter module. The control part includes a UC3842 main controller, and the connection module on the UC3842 main controller includes a PWM module, a current feedback module, a voltage feedback module, and an execution module, and the PWM module is connected with the UC3842 main controller and the execution module; the current feedback The module is connected with the UC3842 main controller and the primary side of the transformer; the voltage feedback module is connected with the linear coupling and the output end of the welding machine; the execution module is connected with the PWM module and the primary side of the transformer.

本实用新型与现有技术相比的有益效果体现在：The beneficial effects of the utility model compared with the prior art are reflected in:

本实用新型采用UC3842控制芯片的高控制性能，保证了整个装置的稳定运行。采用的电流反馈模块、电压反馈模块和PWM模块，在电焊机的工作过程中能发挥良好的作用，使其输出的电能比较稳定，若出现异常时，系统会自动调节，使输出的大小的趋向稳定，The utility model adopts the high control performance of the UC3842 control chip to ensure the stable operation of the whole device. The current feedback module, voltage feedback module and PWM module used can play a good role in the working process of the electric welding machine, so that the output power is relatively stable. If there is an abnormality, the system will automatically adjust to make the output trend. Stablize,

并保持在一定的范围内，从而确保焊接的质量。And keep it within a certain range, so as to ensure the quality of welding.

附图说明Description of drawings

图1为本实用新型的反激式电焊机系统结构图。Fig. 1 is the structural diagram of the flyback electric welding machine system of the present invention.

图2为本实用新型电路原理简图。Fig. 2 is a schematic diagram of the circuit principle of the utility model.

具体实施方式Detailed ways

下面结合附图对本实用新型做详细的说明：Below in conjunction with accompanying drawing, the utility model is described in detail:

如图1所示，本实用新型的一种基于UC3842的反激式小型电焊机包括主电路和控制两部分，主电路部分包括整流模块、滤波模块、高频变压器模块、整流模块、滤波模块。控制部分包括UC3842主控制器,所述UC3842主控制器上连接模块包括PWM模块、电流反馈模块、电压反馈模块、执行模块，所述PWM模块与UC3842主控制器和执行模块连接；所述电流反馈模块与UC3842主控制器和变压器初级侧连接；所述电压反馈模块与线性耦合和电焊机输出端连接；所述执行模块与PWM模块和变压器初级侧连接。As shown in Figure 1, a UC3842-based flyback small electric welding machine of the present invention includes two parts, the main circuit and the control part. The main circuit part includes a rectifier module, a filter module, a high-frequency transformer module, a rectifier module, and a filter module. The control part includes a UC3842 main controller, and the connection module on the UC3842 main controller includes a PWM module, a current feedback module, a voltage feedback module, and an execution module, and the PWM module is connected with the UC3842 main controller and the execution module; the current feedback The module is connected with the UC3842 main controller and the primary side of the transformer; the voltage feedback module is connected with the linear coupling and the output end of the welding machine; the execution module is connected with the PWM module and the primary side of the transformer.

如图2所示，本实用新型电路原理简图，所述电流反馈就是使输出的电流在设定的范围内，输出电流突然发生变化时且偏离设定值时，电路中高频变压器的初级侧中的电流也会发生相应的变化，就会导致流经R19的有相应的变化，从而C14上的电压就会变化，这时UC3842引脚3上的电压会发生变化，使引脚6输出的占空比发生变化，让输出的电流和电压趋向稳定，其中电流突然变化比较大时，引脚3上的电压大于一定电压时UC3842停止工作，保护电焊机和人身安全；所述电压反馈就是通过电压监视器使电焊机输出的电压在一定的范围内，当输出过压或者欠压时，也就是不在电压监视器的范围时，PC817线性光耦就停止工作，确保焊机和人身安全，其中电压监视器是由两个TL431组成的，电压范围是：As shown in Figure 2, the schematic diagram of the circuit principle of the utility model, the current feedback is to make the output current within the set range, when the output current changes suddenly and deviates from the set value, the primary side of the high frequency transformer in the circuit The current in the UC3842 will also change accordingly, which will cause a corresponding change in the flow through R19, so that the voltage on C14 will change. At this time, the voltage on pin 3 of UC3842 will change, so that the output of pin 6 The duty cycle changes to make the output current and voltage tend to be stable. When the current changes suddenly and the voltage on pin 3 is greater than a certain voltage, the UC3842 stops working to protect the welding machine and personal safety; the voltage feedback is through The voltage monitor keeps the output voltage of the welding machine within a certain range. When the output is overvoltage or undervoltage, that is, when it is not within the range of the voltage monitor, the PC817 linear optocoupler will stop working to ensure the safety of the welder and personal safety. The voltage monitor is composed of two TL431, the voltage range is:

下限＝(1+R7/R10)VrefLower limit = (1+R7/R10) Vref

上限＝(1+R8/R11)VrefUpper limit = (1+R8/R11) Vref

当电压小于电压监视器下限设置值就不启动，超过电压监视器上限设置值就不会工作，从而保证了电焊机无论是焊接启动、工作、还是空载时，电焊机输出的电压值就会控制在一定的范围内；其中PC817线性光耦，电气隔离作用，也就是增加安全性，减小电路干扰，减化电路设计。电压反馈中，由于电压监视器和PC817线性光耦的作用，确保了电焊机输出的相对稳定和电焊机的自身保护。When the voltage is lower than the lower limit setting value of the voltage monitor, it will not start, and if it exceeds the upper limit setting value of the voltage monitor, it will not work, thus ensuring that the output voltage value of the welding machine will be the same whether it is welding start, work, or no-load. Control within a certain range; Among them, PC817 linear optocoupler has the function of electrical isolation, that is, to increase safety, reduce circuit interference, and simplify circuit design. In the voltage feedback, due to the function of the voltage monitor and the PC817 linear optocoupler, the relatively stable output of the welding machine and the self-protection of the welding machine are ensured.

Claims (4)

1. the inverse-excitation type miniature welding machine based on UC3842, comprise main circuit and control two parts, main circuit part comprises rectification module, filtration module, high frequency transformer module, rectification module, filtration module, control section comprises UC3842 master controller, on described UC3842 master controller, link block comprises PWM module, current feedback module, voltage feedback module, Executive Module, and described PWM module is connected with UC3842 master controller and Executive Module; Described current feedback module is connected with UC3842 master controller and transformer primary; Described voltage feedback module is connected with linear coupling and electric welding machine output; Described Executive Module is connected with PWM module and transformer primary.

2. a kind of inverse-excitation type miniature welding machine based on UC3842 according to claim 1, is characterized in that: described Executive Module is MOSFET pipe; Described transformer module is intermediate frequency or high frequency R type transformer.

3. a kind of inverse-excitation type miniature welding machine based on UC3842 according to claim 1, is characterized in that: described linear coupling is PC817 linear coupling, has electrical isolation effect.

4. a kind of inverse-excitation type miniature welding machine based on UC3842 according to claim 1, is characterized in that: described voltage feedback module adopts the voltage monitor of two TL431 compositions.