阅读说明：本技术 一种远程遥控与面板控制自动切换的焊接电源 (Welding power supply capable of achieving automatic switching between remote control and panel control ) 是由 舒振宇 朱耀敏 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种远程遥控与面板控制自动切换的焊接电源,涉及焊接电源技术领域,面板控制设置在控制器上,远程遥控通过长距离连接线连接到控制器上,在控制器端,设置相互连接的滤波电路与信号处理电路,滤波电路的输入连接远程遥控的输出,信号处理电路的输出连接模数转换电路,模数转换电路连接控制器主电路。本申请通过提高远程遥控端的电源电压,确保信号传输,减少外界信号对给定信号的干扰；且较高电压输入控制器内部时,能够避免控制器内高频磁场信号干扰。(The invention discloses a welding power supply capable of automatically switching between remote control and panel control, and relates to the technical field of welding power supplies. The method and the device ensure signal transmission by improving the power supply voltage of the remote control end and reduce the interference of external signals on given signals; and when higher voltage is input into the controller, the interference of high-frequency magnetic field signals in the controller can be avoided.)

1. The utility model provides a welding power supply of remote control and panel control automatic switch-over, panel control sets up on the controller, and remote control is connected to the controller through long distance connecting wire on its characterized in that: the controller end is provided with a filter circuit and a signal processing circuit which are mutually connected, the input of the filter circuit is connected with the output of the remote control, the output of the signal processing circuit is connected with an analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is connected with the controller main circuit.

2. The remote controlled and panel controlled automatic switching welding power supply of claim 1, further comprising: the remote control adopts a high-voltage power supply, and the power supply voltage is more than or equal to 2 times of the power supply voltage of the chip.

3. The remote controlled and panel controlled automatic switching welding power supply of claim 1, further comprising: the filter circuit adopts an EMI filter circuit.

4. The remote controlled and panel controlled automatic switching welding power supply of claim 1, further comprising: the signal processing circuit comprises a voltage division circuit used for carrying out voltage reduction processing on the output of the filter circuit.

5. The remote controlled and panel controlled automatic switching welding power supply of claim 4, wherein: the output of the voltage division circuit is connected with the input of the analog-to-digital conversion circuit, and the output of the voltage division circuit is smaller than the power supply voltage of the controller main circuit.

6. The remote controlled and panel controlled automatic switching welding power supply of claim 5, wherein: the voltage divider comprises three resistors connected in series, the output of the filter circuit is connected with a first connecting point of a first resistor and a second resistor, and the other end of the first resistor is connected with the anode of the remote control power supply; a second connection point of the second resistor and the fourth resistor is simultaneously connected with the anode of the first diode and one end of the third resistor, and the other end of the third resistor is used as an output end; the cathode of the first diode is connected with a chip power supply.

7. The remote controlled and panel controlled automatic switching welding power supply of claim 6, further comprising: the first connection point connects the first capacitor to power ground and the second connection point connects the second capacitor to power ground for filtering.

8. The remote controlled and panel controlled automatic switching welding power supply of claim 1, further comprising: the controller main circuit comprises a sampling circuit, wherein the sampling end of the sampling circuit is connected with the input end of the analog-to-digital conversion circuit and is used for collecting the input voltage of the analog-to-digital conversion circuit, and the controller main circuit switches between remote control and panel control according to the magnitude of the sampling voltage.

9. The remote controlled and panel controlled automatic switching welding power supply of claim 8, wherein: when the sampling voltage is greater than or equal to a set value, the main circuit of the controller is switched to panel control; and when the sampling voltage is smaller than the set value, switching to remote control.

Technical Field

The invention relates to the technical field of welding power supplies, in particular to a welding power supply capable of automatically switching between remote control and panel control.

Background

At present, because a distance exists between a working place and a control place, the control on a power supply control panel sometimes cannot be directly used, and thus, a remote control is added in a remote place so as to be convenient for directly controlling the welding power supply in the working place. However, such remote control and power panel control need to be switched, and generally, a manual mode is adopted to switch between panel control and remote control, and the manual switching control is installed on the panel, and sometimes a person needs to switch before returning to the panel control in a remote place. The remote control needs to pass through a relatively long power transmission line, for example, the length of the power transmission line sometimes needs to reach 50 meters and 100 meters, and the length of the power transmission line also needs to reach 10 meters, so that on one hand, attenuation is brought to signal transmission, and on the other hand, the remote control is not convenient to walk back and forth.

Therefore, it is an urgent problem to switch between remote control and panel control automatically.

Disclosure of Invention

The invention aims to provide a welding power supply capable of automatically switching between remote control and panel control, which reduces the voltage of interference voltage after the power supply voltage at a remote control end is increased and processed by a filter circuit and a voltage division circuit, eliminates the external interference signal by the voltage set value, ensures that remote control parameters are not interfered by the outside, improves the precision and the stability of the remote control, and realizes the automatic switching between the remote control and the panel control according to the magnitude of the voltage set value.

The above object of the present invention is achieved by the following technical solutions:

a welding power supply capable of automatically switching between remote control and panel control is characterized in that the panel control is arranged on a controller, the remote control is connected to the controller through a long-distance connecting wire, a filter circuit and a signal processing circuit which are connected with each other are arranged at the end of the controller, the input of the filter circuit is connected with the output of the remote control, the output of the signal processing circuit is connected with an analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is connected with a main circuit of the controller.

The invention is further configured to: the remote control adopts a high-voltage power supply, and the power supply voltage is more than or equal to 2 times of the power supply voltage of the chip.

The invention is further configured to: the filter circuit adopts an EMI filter circuit.

The invention is further configured to: the signal processing circuit comprises a voltage division circuit used for carrying out voltage reduction processing on the output of the filter circuit.

The invention is further configured to: the output of the voltage division circuit is connected with the input of the analog-to-digital conversion circuit, and the output of the voltage division circuit is smaller than the power supply voltage of the controller main circuit.

The invention is further configured to: the voltage divider comprises three resistors connected in series, the output of the filter circuit is connected with a first connecting point of a first resistor and a second resistor, and the other end of the first resistor is connected with the anode of the remote control power supply; a second connection point of the second resistor and the fourth resistor is simultaneously connected with the anode of the first diode and one end of the third resistor, and the other end of the third resistor is used as an output end; the cathode of the first diode is connected with a chip power supply.

The invention is further configured to: the first connection point connects the first capacitor to power ground and the second connection point connects the second capacitor to power ground for filtering.

The invention is further configured to: the controller main circuit comprises a sampling circuit, wherein the sampling end of the sampling circuit is connected with the input end of the analog-to-digital conversion circuit and is used for collecting the input voltage of the analog-to-digital conversion circuit, and the controller main circuit switches between remote control and panel control according to the magnitude of the sampling voltage.

The invention is further configured to: when the sampling voltage is greater than or equal to a set value, the main circuit of the controller is switched to panel control; and when the sampling voltage is smaller than the set value, switching to remote control.

Compared with the prior art, the beneficial technical effects of this application do:

1. the method and the device ensure signal transmission by improving the power supply voltage of the remote control end and reduce the interference of external signals on given signals; when higher voltage is input into the controller, the interference of high-frequency magnetic field signals in the controller can be avoided;

2. furthermore, the filter circuit and the voltage division circuit are arranged to process the given signal of the increased voltage, so that the given voltage waveform is stable and free of interference, and the remote control given precision is guaranteed, so that the output work of the controller is stable, and the welding quality is reliable;

3. further, according to the remote control switching method and device, remote control or control panel control is judged through a voltage set value, and remote control automatic identification switching is achieved.

Drawings

FIG. 1 is a schematic diagram of a control principle architecture of a specific embodiment of the present application;

fig. 2 is a schematic diagram of a control circuit according to an embodiment of the present application.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The utility model provides a welding power supply of remote control and panel control automatic switch-over, welding power supply include the controller, and panel control part sets up on the controller, and remote control is connected to the one end of long distance connecting wire, and the other end of long distance connecting wire is connected to on the controller, and remote control is wired promptly.

At one end of the controller connected to the remote control, as shown in fig. 1, a filter circuit and a signal processing circuit are provided, the input of the filter circuit is connected with the output of the remote control, the output of the filter circuit is connected with the input of the signal processing circuit, the output of the signal processing circuit is connected with an analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is connected with the controller main circuit. The controller main circuit comprises an MCU chip.

The filter circuit adopts an EMI filter circuit and is used for filtering a given signal of the remote control.

The signal processing circuit comprises a voltage division circuit which is used for reducing the voltage of a given signal of the remote control so as to meet the voltage requirement of the analog-digital conversion circuit.

And a high-voltage power supply is adopted at the remote control end, and the power supply voltage of the high-voltage power supply is more than or equal to 2 times of the power supply voltage of the main circuit MCU. Therefore, a given signal sent to the controller by the remote control end has a higher voltage, if the remote control end has an interference signal with a certain amplitude, the amplitude of the interference signal is far smaller than that of the given signal, the amplitude of the interference signal is reduced according to comparison through filtering and signal processing, the interference signal becomes smaller, and the anti-interference capability is improved.

The high-frequency magnetic field interference signal in the controller can also influence the given signal, so that the precision of the remote control end is influenced, the high-voltage power supply is arranged at the remote control end, the given signal amplitude value sent to the controller by the remote control end is increased, the signal amplitude value is transmitted to the main circuit of the controller after being processed, the high-frequency magnetic field interference is reduced, the precision of remote control is improved, and the output of the welding power supply is stable.

The output of the voltage division circuit is connected with the input of the analog-to-digital conversion circuit and used for carrying out voltage reduction processing on the given signal, and the voltage amplitude of the given signal after voltage reduction is smaller than the power supply voltage of the controller main circuit so as to meet the voltage requirement.

As shown in fig. 2, the EMI filter circuit includes a differential mode inductor L1, a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor CY1, and a fourth filter capacitor CY 2.

The first capacitor C1 is connected in parallel between two input terminals of the differential-mode inductor L1, and the second capacitor is connected in parallel between two output terminals of the differential-mode inductor L1.

Two input ends of the differential mode inductor L1 are respectively connected with two output ends of a remote control, one output end of the differential mode inductor L1 is connected with the input end of the signal processing circuit, and the other output end of the differential mode inductor L1 is connected with a direct current power ground.

One end of the third filter capacitor CY1 is connected to one end of the first capacitor C1 and one input end of the differential-mode inductor L1, and the other end is connected to an ac ground.

One end of the fourth filter capacitor CY2 is connected to the other end of the first capacitor C1 and the other input end of the differential-mode inductor L1, and the other end is connected to an ac ground.

The signal processing circuit comprises a voltage division circuit, the voltage division circuit comprises three resistors R1/R2/R4 which are connected in series, the output of the filter circuit is connected with a first connecting point of a first resistor R1 and a second resistor R2, and the other end of the first resistor R1 is connected with the anode of the remote control power supply; a second connection point of the second resistor R2 and the fourth resistor R4 is connected to the anode of the first diode D1 and one end of the third resistor R3, and the other end of the third resistor R3 is used as an output end; the cathode of the first diode D1 is connected to the chip power supply 3.3V.

The first connection connects the third capacitor C3 to power ground and the second connection connects the fourth capacitor C4 to power ground. The third capacitor C3 and the fourth capacitor C4 are also used for filtering.

The controller main circuit comprises a sampling circuit, wherein the sampling end of the sampling circuit is connected with the input end of the analog-to-digital conversion circuit and is used for collecting the input voltage of the analog-to-digital conversion circuit, and the controller main circuit switches between remote control and panel control according to the magnitude of the sampling voltage.

When the sampling voltage is greater than or equal to a set value, the main circuit of the controller is switched to panel control; and when the sampling voltage is smaller than the set value, switching to remote control.

In a specific embodiment of the application, a power supply voltage of a remote control end is 15VDC, a power supply range of an MCU chip of a main control circuit is 1.5-5V, the amplitude of an interference signal is assumed to be 1-2V, a voltage division ratio is set to be 10:1, the amplitude of the interference signal after voltage division is reduced to be 0.1-0.2V, a voltage set value is set to be 0.3V, sampling of the main circuit is controlled, voltage below 0.3V is not taken as a given parameter, sampling is started when the voltage is larger than 0.3V, an ADC is input to an input signal pin of the MCU chip, the input safe voltage range of the MCU chip is met, and by adopting the control method, the external interference signal can be offset, the remote control parameter is guaranteed not to be interfered by the outside, and the remote control precision and stability are improved.

When the remote control is not connected into the power circuit, the potential of 3-3.3V is applied to the input end of the ADC of the analog-to-digital conversion circuit, and when the voltage detected by the input end of the MCU is greater than 3V, the panel control is defaulted; when a remote control interface is accessed, the input end of the ADC has an adjustable potential of 0-2.5V, when the input end of the MCU detects a voltage smaller than 3V, the default is remote control adjustment control, and remote control and panel control automatic switching are realized through program parameter setting.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.