阅读说明：本技术 一种逆变焊机自适应控制系统及方法 (Adaptive control system and method for inverter welding machine ) 是由 不公告发明人 于 2020-03-31 设计创作，主要内容包括：本发明涉及一种逆变焊机自适应控制系统及方法,该系统包括依次串联的输入整流滤波电路、逆变电路、高频变压器和输出整流滤波电路,还包括：输入电压检测电路：用于检测所述输入整流滤波电路的电压信号并获得检测结果；及时序控制单元：用于根据所述检测结果输出用于控制所述逆变电路的参数。本发明只需要一个通用系统就可以覆盖多款电源机型,便于公司标准化管理,降低生产加工管理成本,提高产品通用性和竞争力。(The invention relates to an inversion welder self-adaptive control system and a method, wherein the system comprises an input rectification filter circuit, an inversion circuit, a high-frequency transformer and an output rectification filter circuit which are sequentially connected in series, and the system also comprises: input voltage detection circuit: the voltage signal is used for detecting the voltage signal of the input rectifying and filtering circuit and obtaining a detection result; and a timing control unit: and the parameter control circuit is used for outputting parameters for controlling the inverter circuit according to the detection result. The invention can cover a plurality of power supply models by only one universal system, thereby facilitating the standardized management of companies, reducing the production, processing and management cost and improving the universality and competitiveness of products.)

1. The utility model provides an contravariant welding machine self-adaptation control system, includes input rectifier filter circuit, inverter circuit, high frequency transformer and the output rectifier filter circuit who establishes ties in proper order, its characterized in that still includes:

input voltage detection circuit: the voltage signal is used for detecting the voltage signal of the input rectifying and filtering circuit and obtaining a detection result; and

a timing control unit: and the parameter control circuit is used for outputting parameters for controlling the inverter circuit according to the detection result.

2. The adaptive control system for an inverter welder according to claim 1, characterized in that: the input voltage detection circuit comprises a voltage division circuit, a first operational amplifier circuit, an optical coupler and a second operational amplifier circuit which are sequentially connected in series.

3. The adaptive control system for an inverter welder according to claim 2, characterized in that: the voltage division circuit comprises a resistor R1, a resistor R2 and a resistor R3, one end of the resistor R1 is used as the input end of the voltage division circuit, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with one end of the resistor R3 and is used as the output end of the voltage division circuit, and the other end of the resistor R5 is grounded.

4. The adaptive control system for an inverter welder according to claim 3, characterized in that: the circuit also comprises a capacitor C3 and a capacitor C4, wherein the capacitor C3 and the capacitor C4 are connected in parallel to two ends of the resistor R3.

5. The adaptive control system for an inverter welder according to claim 2, characterized in that: the first operational amplifier circuit comprises a first operational amplifier unit U1, a resistor R4, a resistor R5, a resistor R6 and a capacitor C6; one end of the resistor R4 is used as the input end of the first operational amplifier circuit, and the other end of the resistor R4 is connected with the non-inverting input end of the first operational amplifier unit U1; the inverting input end of the first operational amplifier unit U1 is connected to one end of the resistor R5 and one end of the capacitor C6 and serves as a second output end of the first operational amplifier circuit, and the output end of the first operational amplifier unit U1 is connected to the other end of the capacitor C6 and one end of the resistor R6; the other end of the resistor R6 is used as a first output end of the first operational amplifier circuit, and the other end of the resistor R5 is grounded.

6. The adaptive control system for an inverter welder according to claim 2, characterized in that: the second operational amplifier circuit comprises a second operational amplifier unit U2, a resistor R7, a resistor R8 and a capacitor C7; one end of the resistor R8 is connected with one end of the resistor R7 and one end of the capacitor C7 and serves as the input end of the second operational amplifier circuit, the other end of the resistor R8 is connected with the non-inverting input end of the second operational amplifier unit U2, and the inverting input end of the second operational amplifier unit U2 is connected with the output end of the second operational amplifier circuit and serves as the output end of the second operational amplifier circuit.

7. The adaptive control system for an inverter welder according to claim 2, characterized in that: the input voltage detection circuit further comprises a voltage division filter circuit, the voltage division filter circuit comprises a resistor R9, a resistor R10 and a capacitor C8, one end of the resistor R9 serves as the input end of the voltage division filter circuit, and the other end of the resistor R9 is connected with one end of a resistor R10 and one end of a capacitor C8 and serves as the output end of the voltage division filter circuit.

8. An adaptive control method of an inverter welding machine is characterized in that: and detecting a voltage signal input into the rectifying and filtering circuit, obtaining a detection result, and outputting parameters for controlling the inverter circuit according to the detection result.

9. The adaptive control method of the inverter welding machine according to claim 8, wherein the parameters for controlling the inverter circuit output according to the detection result are specifically: and outputting a first parameter when the detection result is 0V or in a first preset interval, outputting a second parameter when the detection result is in a second preset interval, and not outputting the parameters when the detection result is in other intervals.

10. The adaptive control method of the inverter welding machine according to claim 9, characterized in that: and when the detection result is in other intervals, outputting no parameter but outputting a protection instruction for prompting a user to check and confirm related problems.

Technical Field

The invention relates to the technical field of control of inverter welding machines, in particular to an adaptive control system and method of an inverter welding machine.

Background

The traditional manual arc welding machine generally adopts a knob on a control panel of the welding machine or a remote controller to adjust welding parameters, and a welder can freely adjust the parameters at any time. In practical engineering application, welding parameters are determined by welding process rules, and if a welder can freely adjust the welding parameters, the parameters do not meet the process rules due to operation of the welder and the like, so that a welded workpiece is damaged, and economic loss is caused. Thus, in mature product welding, the welding parameters are already established and generally do not require the welder to freely adjust. In a digital welding machine, a common control principle method comprises the following steps: according to different input power supplies, different time sequence control is carried out, the setting of welding parameters is realized through software, once the setting is carried out on an operation interface, welders without authority cannot change the welding parameters, the stability of the welding parameters can be ensured, the universality is not strong, and the production, processing and management cost is high.

Chinese patent application publication No. CN110328431A discloses an automatic parameter issuing system suitable for a manual arc welding machine, which comprises an upper computer, a lower computer, a motor drive plate, a stepping motor, a coupler and a duplex potentiometer. The automatic issuing process of the welding machine parameters comprises the following steps: firstly, calling welding parameters in a welding process database by an upper computer through man-machine interaction system software, and transmitting the welding parameters to a lower computer through a communication interface; the lower computer collects welding parameters fed back by the duplex potentiometer through the A/D module, and then carries out PID operation on the given welding parameters and the feedback welding parameters through control software to control the output level of the I/O module and the output frequency of the PWM module. The system is put with the welding machine physics to the parameter, can avoid the high frequency induction during the welding machine striking to cause electromagnetic interference to the system of giving, and can realize welding parameter's remote control.

The above prior art solutions have the following drawbacks: the automatic issuing process of the parameters of the welding machine in the scheme needs the participation of an upper computer and human-computer interaction system software, and the application scenes are greatly limited, for example: when the welder is in a use environment with poor network signals, the condition that the parameters of the welder are not issued timely or errors are issued due to the fact that the information is asynchronous exists, and the reliability is not high.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an adaptive control system and an adaptive control method for an inverter welding machine.

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

the utility model provides an contravariant welding machine self-adaptation control system, includes input rectifier filter circuit, inverter circuit, high frequency transformer and the output rectifier filter circuit who establishes ties in proper order, still includes:

input voltage detection circuit: the voltage signal is used for detecting the voltage signal of the input rectifying and filtering circuit and obtaining a detection result; and

a timing control unit: and the parameter control circuit is used for outputting parameters for controlling the inverter circuit according to the detection result.

By adopting the technical scheme, a plurality of power supply models can be covered by only one universal system, so that the standardized management of companies is facilitated, the production and processing management cost is reduced, and the product universality and the competitiveness are improved.

The present invention in a preferred example may be further configured to: the input voltage detection circuit comprises a voltage division circuit, a first operational amplifier circuit, an optical coupler and a second operational amplifier circuit which are sequentially connected in series.

By adopting the technical scheme, the optical coupler plays the roles of isolating the input voltage from the output voltage and transmitting signals, so that the isolation of an input high-voltage part and an output low-voltage control signal is ensured, the safety of the output signal is ensured, and meanwhile, an equal proportion signal of the input voltage is transmitted.

The present invention in a preferred example may be further configured to: the voltage division circuit comprises a resistor R1, a resistor R2 and a resistor R3, one end of the resistor R1 is used as the input end of the voltage division circuit, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with one end of the resistor R3 and is used as the output end of the voltage division circuit, and the other end of the resistor R5 is grounded.

By adopting the technical scheme, the resistors R1, R2 and R3 form a voltage dividing circuit, and high voltage which is input into the rectifying and filtering circuit is subjected to voltage dividing processing through the resistors to obtain proper proportional voltage.

The present invention in a preferred example may be further configured to: the circuit also comprises a capacitor C3 and a capacitor C4, wherein the capacitor C3 and the capacitor C4 are connected in parallel to two ends of the resistor R3.

By adopting the technical scheme, the capacitors C3 and C4 are connected in parallel at two ends of the resistor R3 to play a filtering role, and because the capacitor C1 with smaller capacity is selected from the input rectifying and filtering circuit to meet the requirement of small volume, but voltage fluctuation still exists at two ends of the capacitor C1, and secondary filtering is carried out through the capacitors C3 and C4, so that high-frequency interference signals can be removed, stable voltage is obtained, and the detection precision is improved.

The present invention in a preferred example may be further configured to: the first operational amplifier circuit comprises a first operational amplifier unit U1, a resistor R4, a resistor R5, a resistor R6 and a capacitor C6; one end of the resistor R4 is used as the input end of the first operational amplifier circuit, and the other end of the resistor R4 is connected with the non-inverting input end of the first operational amplifier unit U1; the inverting input end of the first operational amplifier unit U1 is connected to one end of the resistor R5 and one end of the capacitor C6 and serves as a second output end of the first operational amplifier circuit, and the output end of the first operational amplifier unit U1 is connected to the other end of the capacitor C6 and one end of the resistor R6; the other end of the resistor R6 is used as a first output end of the first operational amplifier circuit, and the other end of the resistor R5 is grounded.

Through adopting above-mentioned technical scheme, electric capacity C6 connects in parallel between first operational unit U1 output and inverting input, plays the integral effect, and first operational unit U1 inverting input and the first output of optical coupler U3 are connected to resistance R5 one end, and the other end ground connection, when optical coupler U3 first output current, gather voltage signal, feed back to first operational unit U1 inverting input.

The present invention in a preferred example may be further configured to: the second operational amplifier circuit comprises a second operational amplifier unit U2, a resistor R7, a resistor R8 and a capacitor C7; one end of the resistor R8 is connected with one end of the resistor R7 and one end of the capacitor C7 and serves as the input end of the second operational amplifier circuit, the other end of the resistor R8 is connected with the non-inverting input end of the second operational amplifier unit U2, and the inverting input end of the second operational amplifier unit U2 is connected with the output end of the second operational amplifier circuit and serves as the output end of the second operational amplifier circuit.

By adopting the technical scheme, one end of the resistor R7 and one end of the capacitor C7 are connected with the second output end of the optical coupler U3, the other end of the resistor R7 and the other end of the capacitor C7 are grounded, when the second output end of the optical coupler outputs current, voltage signals are collected and are connected with the non-inverting input end of the second operational amplifier unit U2 through the resistor R8, the output end and the inverting input end of the second operational amplifier unit U2 are connected, and the second operational amplifier unit U2 plays a following role.

The present invention in a preferred example may be further configured to: the input voltage detection circuit further comprises a voltage division filter circuit, the voltage division filter circuit comprises a resistor R9, a resistor R10 and a capacitor C8, one end of the resistor R9 serves as the input end of the voltage division filter circuit, and the other end of the resistor R9 is connected with one end of a resistor R10 and one end of a capacitor C8 and serves as the output end of the voltage division filter circuit.

By adopting the technical scheme, the resistors R9 and R10 and the capacitor C8 form a voltage division filter circuit, and an obtained proper voltage signal is fed back to the time sequence control unit.

The second aim of the invention is realized by the following technical scheme:

a self-adaptive control method for an inverter welding machine is characterized in that a voltage signal input into a rectification filter circuit is detected, a detection result is obtained, and parameters for controlling the inverter circuit are output according to the detection result.

By adopting the technical scheme, a plurality of power supply models can be covered by only one universal system, so that the standardized management of companies is facilitated, the production and processing management cost is reduced, and the product universality and the competitiveness are improved.

The present invention in a preferred example may be further configured to: the parameters for controlling the inverter circuit output according to the detection result are specifically as follows: and outputting a first parameter when the detection result is 0V or in a first preset interval, outputting a second parameter when the detection result is in a second preset interval, and not outputting the parameters when the detection result is in other intervals.

By adopting the technical scheme, a plurality of power supply models can be covered by only one universal system, so that the standardized management of companies is facilitated, the production and processing management cost is reduced, and the product universality and the competitiveness are improved.

The present invention in a preferred example may be further configured to: and when the detection result is in other intervals, outputting no parameter but outputting a protection instruction for prompting a user to check and confirm related problems.

By adopting the technical scheme, when the detection result is not in the set parameter range, the product is output and protected, a client is prompted to investigate and confirm the related power supply, the product can be effectively protected to stably work under the normal power supply, and the product stability is improved.

In summary, the invention includes at least one of the following beneficial technical effects:

1. a plurality of power supply machine types can be covered by only one universal system, so that the standardized management of a company is facilitated, the production, processing and management cost is reduced, and the product universality and competitiveness are improved;

2. when the power supply is detected not to be in the set parameter range, the product is output and protected, a customer is prompted to investigate and confirm the related power supply, the product can be effectively protected to stably work under the normal power supply, and the product stability is improved.

Drawings

FIG. 1 is a schematic block diagram of the system of the present invention;

fig. 2 is a schematic diagram of an input voltage detection circuit according to an embodiment of the invention.

Detailed Description

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

Referring to fig. 1, the adaptive control system for an inverter welding machine disclosed by the present invention includes an input rectification filter circuit, an inverter circuit, a high frequency transformer and an output rectification filter circuit, which are connected in series in sequence, and further includes:

input voltage detection circuit: the voltage signal is used for detecting the voltage signal of the input rectifying and filtering circuit and obtaining a detection result; and

a timing control unit: and the parameter control circuit is used for outputting parameters for controlling the inverter circuit according to the detection result.

Referring to fig. 2, the input voltage detection circuit includes a voltage divider circuit, a first operational amplifier circuit, an optical coupler, and a second operational amplifier circuit, which are sequentially connected in series. The optical coupler plays the roles of isolating input voltage from output voltage and transmitting signals, ensures the isolation of an input high-voltage part and an output low-voltage control signal, ensures the safety of output signals and simultaneously transmits equal-proportion signals of the input voltage.

With reference to fig. 2, the voltage divider circuit includes a resistor R1, a resistor R2, and a resistor R3, one end of the resistor R1 is connected to the output end of the input rectifying and filtering circuit as the input end of the voltage divider circuit, the other end of the resistor R1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to one end of the resistor R3 and is connected to the input end of the first operational amplifier circuit as the output end of the voltage divider circuit, and the other end of the resistor R5 is grounded. The resistors R1, R2 and R3 form a voltage dividing circuit, and high voltage input into the rectifying and filtering circuit is subjected to voltage dividing treatment through the resistors to obtain proper proportional voltage.

With continued reference to fig. 2, a capacitor C3 and a capacitor C4 are further included, and the capacitor C3 and the capacitor C4 are both connected in parallel across the resistor R3. The capacitors C3 and C4 are connected in parallel at two ends of the resistor R3 to play a filtering role, because the capacitor C1 with smaller capacity is selected in the input rectifying and filtering circuit to meet the requirement of small volume, but voltage fluctuation still exists at two ends of the capacitor C1, and secondary filtering is carried out through the capacitors C3 and C4, so that high-frequency interference signals can be removed, stable voltage is obtained, and the detection accuracy is improved.

With continued reference to fig. 2, the first operational amplifier circuit includes a first operational amplifier unit U1, a resistor R4, a resistor R5, a resistor R6, a capacitor C2, and a capacitor C6; one end of the resistor R4 is used as the input end of the first operational amplifier circuit and is connected with the output end of the voltage division circuit, and the other end of the resistor R4 is connected with the non-inverting input end of the first operational amplifier unit U1; the inverting input end of the first operational amplifier unit U1 is connected to one end of the resistor R5 and one end of the capacitor C6, and serves as the second output end of the first operational amplifier circuit to be connected to the second input end of the optical coupler, and the output end of the first operational amplifier unit U1 is connected to the other end of the capacitor C6 and one end of the resistor R6; the other end of the resistor R6 is used as a first output end of the first operational amplifier circuit to be connected with a first input end of the optical coupler, the other end of the resistor R5 is grounded, a power supply end of the first operational amplifier unit U1 is connected with one end of the capacitor C2 and the first power supply VCC1, and the other end of the capacitor C2 is grounded.

The capacitor C6 is connected in parallel between the output end and the inverting input end of the first operational amplifier unit U1 to play an integrating role, one end of the resistor R5 is connected with the inverting input end of the first operational amplifier unit U1 and the first output end of the optical coupler U3, the other end of the resistor R5 is grounded, and when the first output end of the optical coupler U3 outputs current, voltage signals are collected and fed back to the inverting input end of the first operational amplifier unit U1.

With continued reference to fig. 2, the second operational amplifier circuit includes a second operational amplifier unit U2, a resistor R7, a resistor R8, a capacitor C5, and a capacitor C7; resistance R8 one end is connected resistance R7 one end and electric capacity C7 one end and conduct the second fortune is put the circuit input end and is connected the optical coupler output, the resistance R8 other end is connected second fortune is put unit U2 in-phase input end, second fortune is put unit U2 inverting input end and is connected it second fortune is put unit U2 output end and is regarded as second fortune is put the circuit output end, second fortune is put unit U2 power end and is connected electric capacity C5 one end and second power VCC2, electric capacity C5 other end ground connection.

One end of the resistor R7 and one end of the capacitor C7 are connected with the second output end of the optocoupler U3, the other end of the resistor R7 and one end of the capacitor C7 are grounded, when the second output end of the optocoupler outputs current, voltage signals are collected and are connected with the non-inverting input end of the second operational amplifier unit U2 through the resistor R8, the output end of the second operational amplifier unit U2 is connected with the inverting input end, and the second operational amplifier unit U2 plays a following role. The ground connection of 1 foot of optical coupler U3, 2 feet conduct the input of optical coupler, first power VCC1 is connected to 3 feet, and 4 feet conduct the first output of optical coupler, 5 feet conduct the second output of optical coupler, second power VCC2 is connected to 6 feet, and 7 feet and 8 feet are unsettled.

Continuing to refer to fig. 2, the input voltage detection circuit further includes a voltage-dividing filter circuit connected to the output terminal of the second operational amplifier circuit, the voltage-dividing filter circuit includes a resistor R9, a resistor R10 and a capacitor C8, one end of the resistor R9 is used as the input terminal of the voltage-dividing filter circuit and connected to the output terminal of the second operational amplifier circuit, the other end of the resistor R9 is connected to one end of the resistor R10 and one end of the capacitor C8, and is used as the output terminal of the voltage-dividing filter circuit and connected to the timing control unit. The resistors R9 and R10 and the capacitor C8 form a voltage division filter circuit, and an obtained proper voltage signal is fed back to the time sequence control unit.

The invention also provides an adaptive control method of the inverter welding machine, which comprises the steps of detecting the voltage signal input into the rectifying and filtering circuit by using the input voltage detection circuit and obtaining a detection result, and outputting parameters for controlling the inverter circuit by the time sequence control unit according to the detection result.

The parameter output by the time sequence control unit according to the detection result and used for controlling the inverter circuit is specifically as follows: when the detection result is 0V or in a first preset interval, the time sequence control unit outputs a first parameter, when the detection result is in a second preset interval, the time sequence control unit outputs a second parameter, and when the detection result is in other intervals, the time sequence control unit does not output the parameter.

And when the detection result is in other intervals, outputting no parameter but outputting a protection instruction for prompting a user to check and confirm related problems. When the power supply is detected not to be in the set parameter range, the product is output and protected, a customer is prompted to investigate and confirm the related power supply, the product can be effectively protected to stably work under the normal power supply, and the product stability is improved.

Specifically, an embodiment of the present invention provides an adaptive control method for an inverter welding machine, where an input voltage detection circuit is used to detect a voltage signal input to a rectifying and filtering circuit and obtain a detection result, and when the detection result is 0V or is in a first preset interval (in this embodiment, 1.00 to 1.80V), a timing control unit outputs a first parameter, where when the detection result is 1.00 to 1.80V, the corresponding voltage signal input to the rectifying and filtering circuit is 80 to 145Vac, and a corresponding relationship between the detection result and the voltage signal input to the rectifying and filtering circuit is determined by each parameter in the input voltage detection circuit, and in this embodiment, only one corresponding relationship is provided, where the first parameter is a parameter under a 110V power supply, and an output parameter range is 30 to 140A; when the detection result is in a second preset interval (2.24-3.30V in the embodiment), the timing control unit outputs a second parameter, wherein when the detection result is 2.24-3.30V, the corresponding voltage signal input into the rectifying and filtering circuit is 180-265 Vac, the second parameter is a parameter under a 220V power supply, and the output parameter range is 30-200A; when the detection result is in other intervals (0.62-0.87V or 1.87-2.11V or more than 3.3V in the embodiment), the timing control unit does not output parameters, but outputs a protection instruction for prompting a user to perform troubleshooting and confirmation related problems, wherein when the detection result is 0.62-0.87V, the corresponding voltage signal input to the rectifying and filtering circuit is 50-70 Vac, when the detection result is 1.87-2.11V, the corresponding voltage signal input to the rectifying and filtering circuit is 150-170 Vac, and when the detection result is more than 3.3V, the corresponding voltage signal input to the rectifying and filtering circuit is more than 265 Vac.

When the power supply is applied to various power supply products (such as 110V, 220V and 110V/220V double power supplies, namely 3 input power supply products), multiple power supply types can be covered by only one universal system, so that the standardization management of companies is facilitated, the production and processing management cost is reduced, and the universality and the competitiveness of the products are improved.

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.