Isolated remote control circuit and host

Abstract

The utility model relates to the technical field of welding gun switch control, and discloses an isolation type remote control circuit and a host, the isolation type remote control circuit comprises a button switch circuit, an isolation circuit and a voltage sampling circuit, the button switch circuit is internally provided with a plurality of function buttons, and when any one function button is pressed down, the isolation circuit is connected with the voltage sampling circuit. The key switch circuit outputs a voltage with a corresponding amplitude to the isolation circuit; the isolating circuit realizes electrical isolation between the key switch circuit and the host; after the host controls the voltage sampling circuit to be conducted, the voltage sampling circuit collects the fourth end voltage of the isolation circuit and outputs the fourth end voltage to the host, the host recognizes the amplitude of the output voltage of the voltage sampling circuit and executes the corresponding function, and therefore on the basis that a GPIO port of the host is not occupied, the number of the keys is expanded.

Description

Technical Field

[0001] This utility model relates to the field of welding torch switch control technology, specifically to an isolated remote control circuit and host. Background Technology

[0002] Argon arc welding (ATW) is a welding technique that uses argon gas as a shielding gas. It is also known as argon gas shielded welding. It involves circulating argon gas around the arc welding area to isolate the weld zone from air and prevent oxidation.

[0003] Argon arc welding is a welding technique based on the principle of ordinary electric arc welding. It uses argon gas to protect the metal welding material and a high current to melt the welding material into a liquid state on the substrate to form a molten pool, so that the metal to be welded and the welding material achieve metallurgical bonding. Because argon gas is continuously supplied during high-temperature molten welding, the welding material cannot come into contact with oxygen in the air, thus preventing oxidation of the welding material. Therefore, it can weld stainless steel and ferrous metals.

[0004] The welding torch needs to be controlled by a switch control circuit during operation. However, the existing welding torch switch control circuit has poor anti-interference ability and poor control accuracy. It is not convenient for operators to perform multi-function selection, parameter adjustment and other operations. It also does not support multi-button combination operation and cannot expand the number of buttons, making it very inconvenient to use. Utility Model Content

[0005] In view of this, the present invention provides an isolated remote control circuit and host to solve the problem that the switch control technology of argon arc welding cannot expand the number of buttons.

[0006] In a first aspect, this utility model provides an isolated remote control circuit, comprising: a push-button switch circuit, an isolation circuit, and a voltage sampling circuit. The first terminal of the push-button switch circuit is connected to the first terminal of the isolation circuit, and the second terminal of the push-button switch circuit is connected to the second terminal of the isolation circuit. The push-button switch circuit has multiple built-in function buttons. When any function button is pressed, the push-button switch circuit outputs a voltage of corresponding amplitude to the isolation circuit. The third terminal of the isolation circuit receives the power supply voltage, and the fourth terminal of the isolation circuit is connected to the first terminal of the voltage sampling circuit. The isolation circuit is used to achieve electrical isolation between the push-button switch circuit and the host computer. The second terminal of the voltage sampling circuit is grounded, and both the third and fourth terminals of the voltage sampling circuit are connected to the host computer. After the host computer controls the voltage sampling circuit to turn on, the voltage sampling circuit collects the voltage at the fourth terminal of the isolation circuit and outputs it to the host computer. The host computer recognizes the amplitude of the output voltage of the voltage sampling circuit and executes the corresponding function.

[0007] The utility model discloses a plurality of function keys are built-in in the key switch circuit, and when a certain function key is pressed, the key switch circuit outputs the voltage of corresponding amplitude to the isolation circuit, and the host computer determines the function key pressed by identifying the amplitude of the voltage to execute the corresponding function, so as to realize the expansion of the number of keys without occupying the host computer GPIO port.

[0008] In an alternative embodiment, the function keys include a first function key, a second function key, a third function key and a fourth function key, and the key switch circuit further includes a voltage dividing circuit, which includes a first resistor, a second resistor, a third resistor and a fourth resistor. The first end of the first function key is connected to the first end of the first resistor, and the second end of the first function key is connected to the first end of the isolation circuit. The first end of the second function key is connected to the second end of the first resistor and the first end of the second resistor, and the second end of the second function key is connected to the first end of the isolation circuit. The first end of the third function key is connected to the second end of the second resistor and the first end of the third resistor, and the second end of the third function key is connected to the first end of the isolation circuit. The first end of the fourth function key is connected to the second end of the third resistor and the first end of the fourth resistor, and the second end of the fourth function key is connected to the first end of the isolation circuit. The second end of the fourth resistor is connected to the second end of the isolation circuit.

[0009] In an alternative embodiment, the isolation circuit includes a first inductor and a second inductor. The first end of the first inductor is connected to the first end of the key switch circuit, and the second end of the first inductor is connected to the second end of the key switch circuit. The first end of the second inductor is connected to the supply voltage, and the second end of the second inductor is connected to the first end of the voltage sampling circuit. The first inductor and the second inductor constitute an isolation transformer.

[0010] In an alternative embodiment, the voltage sampling circuit includes a control switch circuit and a filter circuit. The first end of the control switch circuit is connected to the fourth end of the isolation circuit, the second end of the control switch circuit is connected to the first end of the filter circuit, and the control end of the control switch circuit is connected to the host computer. The second end of the filter circuit is grounded, and the third end of the filter circuit is connected to the host computer.

[0011] In an alternative embodiment, the filter circuit is a second-order filter circuit.

[0012] In an alternative embodiment, the second-order filter circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor and a second capacitor, wherein a first end of the fifth resistor is connected with a second end of the sixth resistor and a second end of the control switch circuit, and a second end of the fifth resistor is grounded; a second end of the sixth resistor is connected with a first end of the seventh resistor and a first end of the first capacitor; a second end of the seventh resistor is connected with a first end of the second capacitor and the host; a second end of the first capacitor is grounded; and a second end of the second capacitor is grounded.

[0013] In an alternative embodiment, the control switch circuit comprises a triode and an eighth resistor, wherein a first end of the triode is connected with the fourth end of the isolation circuit, a second end of the triode is connected with the first end of the filter circuit, and a control end of the triode is connected with a first end of the eighth resistor; and a second end of the eighth resistor is connected with the host.

[0014] In an alternative embodiment, the isolated remote control circuit further comprises a device interface and a host interface, wherein the device interface is connected with the first end and the second end of the key switch circuit, the host interface is connected with the first end and the second end of the isolation circuit, and the device interface is connected with the host interface through a double-core wire.

[0015] In a second aspect, the utility model provides a host, its characterized in be isolated remote control circuit and singlechip of first aspect and any alternative embodiment thereof, wherein the first end of key switch circuit is connected with the first end of isolation circuit, the second end of key switch circuit is connected with the second end of isolation circuit, a plurality of function keys are built-in in key switch circuit, when any one function key is pressed, key switch circuit exports the voltage of corresponding amplitude to isolation circuit, the third end of isolation circuit inputs supply voltage, the fourth end of isolation circuit is connected with the first end of voltage sampling circuit, and isolation circuit is used to realize the electrical isolation between key switch circuit and singlechip, the second end of voltage sampling circuit is grounded, and the third end and the fourth end of voltage sampling circuit are all connected with host, after singlechip control voltage sampling circuit conduction, voltage sampling circuit gathers the fourth end voltage of isolation circuit and exports to singlechip, and singlechip identifies the amplitude of output voltage of voltage sampling circuit and executes corresponding function. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0017] Figure 1This is a composition diagram of an isolated remote control circuit according to an embodiment of the present utility model;

[0018] Figure 2 This is a detailed circuit structure diagram of the isolated remote control circuit according to an embodiment of the present utility model;

[0019] Figure 3 This is a diagram illustrating the composition of another isolated remote control circuit according to an embodiment of the present utility model;

[0020] Figure 4 This is a composition diagram of the host according to an embodiment of the present utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] This embodiment provides an isolated remote control circuit, such as Figure 1 As shown, it includes: a push-button switch circuit 1, an isolation circuit 2, and a voltage sampling circuit 3.

[0023] like Figure 1 As shown, the first terminal of the push-button switch circuit 1 is connected to the first terminal of the isolation circuit 2, and the second terminal of the push-button switch circuit 1 is connected to the second terminal of the isolation circuit 2. The push-button switch circuit 1 has multiple built-in function buttons. When any function button is pressed, the push-button switch circuit 1 outputs a voltage of corresponding amplitude to the isolation circuit 2. The third terminal of the isolation circuit 2 receives the power supply voltage, and the fourth terminal of the isolation circuit 2 is connected to the first terminal of the voltage sampling circuit 3. The isolation circuit 2 is used to achieve electrical isolation between the push-button switch circuit 1 and the host. The second terminal of the voltage sampling circuit 3 is grounded, and both the third and fourth terminals of the voltage sampling circuit 3 are connected to the host.

[0024] After the host controls the voltage sampling circuit 3 to be turned on, the voltage sampling circuit 3 collects the voltage at the fourth terminal of the isolation circuit 2 and outputs it to the host. The host recognizes the amplitude of the output voltage of the voltage sampling circuit 3 and executes the corresponding function.

[0025] Specifically, the key switch circuit 1 is built-in multiple function keys, each function key is pressed, the key switch circuit 1 outputs a corresponding amplitude voltage to the isolation circuit 2. For example: the key switch circuit 1 includes four function keys, respectively, the first function key, the second function key, the third function key, the fourth function key, the host computer takes a single-chip microcomputer as an example. When the first function key is pressed, the voltage output by the key switch circuit 1 is recognized by the single-chip microcomputer, and the single-chip microcomputer starts to start the setting function, which can be configured with argon arc welding motor parameters; When the second function key is pressed, the voltage output by the key switch circuit 1 is recognized by the single-chip microcomputer, and the single-chip microcomputer starts to start the function switching; When the third function key is pressed, the voltage output by the key switch circuit 1 is recognized by the single-chip microcomputer, and the single-chip microcomputer starts to control the argon arc welding motor to accelerate; When the fourth function key is pressed, the voltage output by the key switch circuit 1 is recognized by the single-chip microcomputer, and the single-chip microcomputer starts to control the argon arc welding motor to decelerate.

[0026] Specifically, the ADC port of the single-chip microcomputer is connected with the fourth end of the voltage sampling circuit 3. In order to realize that each function key corresponds to a voltage with different amplitude and the single-chip microcomputer can recognize it, the binary number of the amplitude of the voltage corresponding to the first function key can be set as 128, the binary number of the amplitude of the voltage corresponding to the second function key can be set as 256, the binary number of the amplitude of the voltage corresponding to the third function key can be set as 512, and the binary number of the amplitude of the voltage corresponding to the fourth function key can be set as 1024.

[0027] In some optional embodiments, as shown in Figure 2 The key switch circuit 1 further includes a voltage dividing circuit, and the voltage dividing circuit includes a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4.

[0028] As shown in Figure 2 The first end of the first function key K1 is connected with the first end of the first resistor R1, and the second end of the first function key K1 is connected with the first end of the isolation circuit 2; the first end of the second function key K2 is connected with the second end of the first resistor R1 and the first end of the second resistor R2, and the second end of the second function key K2 is connected with the first end of the isolation circuit 2; the first end of the third function key K3 is connected with the second end of the second resistor R2 and the first end of the third resistor R3, and the second end of the third function key K3 is connected with the first end of the isolation circuit 2; the first end of the fourth function key K4 is connected with the second end of the third resistor R3 and the first end of the fourth resistor R4, and the second end of the fourth function key K4 is connected with the first end of the isolation circuit 2; the second end of the fourth resistor R4 is connected with the second end of the isolation circuit 2.

[0029] Specifically, when the first function button K1 is pressed, the first function button K1 is connected in series with the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 to form a loop with the isolation circuit 2; when the second function button K2 is pressed, the second function button K2 is connected in series with the second resistor R2, the third resistor R3 and the fourth resistor R4 to form a loop with the isolation circuit 2; when the third function button K3 is pressed, the third function button K3 is connected in series with the third resistor R3 and the fourth resistor R4 to form a loop with the isolation circuit 2; when the fourth function button K4 is pressed, the fourth function button K4 is connected in series with the fourth resistor R4 to form a loop with the isolation circuit 2. Since the total resistance value of the resistor connected in series with the function button is different when the function button is pressed, the voltage received by the isolation circuit 2 is different, thereby identifying the pressed function button.

[0030] Optionally, the function button is not limited to Figure 2 four, and the specific number is set according to the requirement. Similarly, the resistors of the voltage dividing circuit are not limited to four, and the total resistance value of the resistor connected in series with the function button is different when the function button is pressed, which is not limited herein.

[0031] In some optional embodiments, as shown in Figure 2 the isolation circuit 2 comprises a first inductor L1 and a second inductor L2, wherein the first end of the first inductor L1 is connected with the first end of the button switch circuit 1, the second end of the first inductor L1 is connected with the second end of the button switch circuit 1; the first end of the second inductor L2 is connected with the supply voltage, and the second end of the second inductor L2 is connected with the first end of the voltage sampling circuit 3; the first inductor L1 and the second inductor L2 constitute an isolation transformer.

[0032] In some optional embodiments, as shown in Figure 3 the voltage sampling circuit 3 comprises a control switch circuit 31 and a filter circuit 32, wherein the first end of the control switch circuit 31 is connected with the fourth end of the isolation circuit 2, the second end of the control switch circuit is connected with the first end of the filter circuit 32, and the control end of the control switch circuit is connected with the host; the second end of the filter circuit 32 is grounded, and the third end of the filter circuit 32 is connected with the host.

[0033] Specifically, when the host controls the control switch circuit 31 to be turned on, the fourth end voltage of the isolation circuit 2 is transmitted to the host, that is, the voltage sampling circuit 3 starts sampling; when the host controls the control switch circuit 31 to be turned off, the fourth end of the isolation circuit 2 is disconnected with the host, and the voltage sampling circuit 3 stops sampling.

[0034] Specifically, since the button switch circuit 1 is built-in with multiple function buttons, a current spike will be generated when the function button is pressed. In order to enable the host to accurately identify the voltage amplitude, the filter circuit 32 is arranged to filter out the spike and remove the jitter.

[0035] In some optional embodiments, the filter circuit 32 is a second-order filter circuit. Optionally, as shown in FIG. 4, the second-order filter circuit comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1 and a second capacitor C2, wherein a first end of the fifth resistor R5 is connected with a first end of the sixth resistor R6 and a second end of the control switch circuit 31, a second end of the fifth resistor R5 is grounded; a second end of the sixth resistor R6 is connected with a first end of the seventh resistor R7 and a first end of the first capacitor C1; a second end of the seventh resistor R7 is connected with a first end of the second capacitor C2 and the host; a second end of the first capacitor C1 is grounded; and a second end of the second capacitor C2 is grounded. Figure 2

[0036] Specifically, when a function button is pressed, a voltage with a large peak is generated on the fifth resistor R5, and then the voltage is filtered by the filter circuit 32 composed of the sixth resistor R6, the seventh resistor R7, the first capacitor C1 and the second capacitor C2, and then enters the host.

[0037] In some optional embodiments, as shown in FIG. 3, the control switch circuit 31 comprises a triode Q1 and an eighth resistor R8, wherein a first end of the triode Q1 is connected with a fourth end of the isolation circuit 2, a second end of the triode Q1 is connected with a first end of the filter circuit 32, a control end of the triode Q1 is connected with a first end of the eighth resistor R8; and a second end of the eighth resistor R8 is connected with the host. Figure 2 Optionally, the triode Q1 can be an IGBT, but this is only an example and is not limited thereto.

[0038] In some optional embodiments, as shown in FIG. 1, the isolation type remote control circuit further comprises a device interface and a host interface, wherein the device interface is connected with the first end and the second end of the key switch circuit 1, the host interface is connected with the first end and the second end of the isolation circuit 2, and the device interface is connected with the host interface through a double-core wire.

[0039] Figure 2 In some optional embodiments, as shown in FIG. 1, the isolation type remote control circuit further comprises a device interface and a host interface, wherein the device interface is connected with the first end and the second end of the key switch circuit 1, the host interface is connected with the first end and the second end of the isolation circuit 2, and the device interface is connected with the host interface through a double-core wire.

[0040] In the present embodiment, a host is provided, as shown in FIG. 2, comprising the isolation type remote control circuit and the single-chip microcomputer 4 of the above embodiments and any optional embodiments thereof, wherein, Figure 4 a first end of the key switch circuit 1 is connected with a first end of the isolation circuit 2, a second end of the key switch circuit 1 is connected with a second end of the isolation circuit 2, the key switch circuit 1 is built-in with a plurality of function buttons, when any one of the function buttons is pressed, the key switch circuit 1 outputs a voltage with a corresponding amplitude to the isolation circuit 2;

[0041]

[0042] ​​​The third end of the isolation circuit 2 inputs a power supply voltage, the fourth end of the isolation circuit 2 is connected with the first end of the voltage sampling circuit 3, and the isolation circuit 2 is used for realizing electrical isolation between the key switch circuit 1 and the single-chip microcomputer;

[0043] The second end of the voltage sampling circuit 3 is grounded, and the third end and the fourth end of the voltage sampling circuit 3 are connected with the host computer;

[0044] After the single-chip microcomputer controls the voltage sampling circuit 3 to be turned on, the voltage sampling circuit 3 collects the voltage of the fourth end of the isolation circuit 2 and outputs to the single-chip microcomputer, and the single-chip microcomputer identifies the amplitude of the output voltage of the voltage sampling circuit 3 and executes corresponding functions.

[0045] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. An isolated remote control circuit, characterized by The application relates to a key switch circuit, an isolation circuit and a voltage sampling circuit. The first end of the key switch circuit is connected with the first end of the isolation circuit, the second end of the key switch circuit is connected with the second end of the isolation circuit, and the key switch circuit is internally provided with multiple function keys. The third end of the isolation circuit inputs a power supply voltage, the fourth end of the isolation circuit is connected with the first end of the voltage sampling circuit, and the isolation circuit is used for realizing electrical isolation between the key switch circuit and a host. The second end of the voltage sampling circuit is grounded, and the third end and the fourth end of the voltage sampling circuit are connected with the host. After the host controls the voltage sampling circuit to be turned on, the voltage sampling circuit collects the fourth end voltage of the isolation circuit and outputs the fourth end voltage to the host. The function keys include a first function key, a second function key, a third function key and a fourth function key. The first end of the first function key is connected with the first end of the first resistor, and the second end of the first function key is connected with the first end of the isolation circuit. The first end of the second function key is connected with the second end of the first resistor and the first end of the second resistor, and the second end of the second function key is connected with the first end of the isolation circuit.

2. The isolated remote control circuit of claim 1, wherein, The first end of the third function key is connected with the second end of the second resistor and the first end of the third resistor, and the second end of the third function key is connected with the first end of the isolation circuit. The first end of the fourth function key is connected with the second end of the third resistor and the first end of the fourth resistor, and the second end of the fourth function key is connected with the first end of the isolation circuit. The second end of the fourth resistor is connected with the second end of the isolation circuit. The first end of the first inductor is connected with the first end of the key switch circuit, and the second end of the first inductor is connected with the second end of the key switch circuit.

3. The isolated remote control circuit of claim 1, wherein, The first end of the second inductor is connected with the power supply voltage, and the second end of the second inductor is connected with the first end of the voltage sampling circuit. The first inductor and the second inductor constitute an isolation transformer. The voltage sampling circuit comprises a control switch circuit and a filter circuit. The first end of the control switch circuit is connected with the fourth end of the isolation circuit, the second end of the control switch circuit is connected with the first end of the filter circuit, and the control end of the control switch circuit is connected with the host. The second end of the filter circuit is grounded, and the third end of the filter circuit is connected with the host.

4. The isolated remote control circuit of claim 3, wherein, The filter circuit is a second-order filter circuit.

5. The isolated remote control circuit of claim 4, wherein, The second-order filter circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a first capacitor and a second capacitor, wherein, The first end of the fifth resistor is connected with the first end of the sixth resistor and the second end of the control switch circuit, and the second end of the fifth resistor is grounded. The second end of the sixth resistor is connected with the first end of the seventh resistor and the first end of the first capacitor. The second end of the seventh resistor is connected with the first end of the second capacitor and the host. The second end of the first capacitor is grounded. The second end of the second capacitor is grounded.

6. The isolated remote control circuit of claim 3, wherein, The control switch circuit comprises a triode and an eighth resistor, wherein, The first end of the triode is connected with the fourth end of the isolation circuit, the second end of the triode is connected with the first end of the filter circuit, and the control end of the triode is connected with the first end of the eighth resistor. The second end of the eighth resistor is connected with the host.

7. The isolated remote control circuit of claim 1, wherein, Further comprising: a device interface and a host interface, wherein, the device interface is connected with the first end and the second end of the key switch circuit, the host interface is connected with the first end and the second end of the isolation circuit, and the device interface is connected with the host interface through a double-core wire.

8. A host, characterized by comprising the isolation type remote control circuit according to any one of claims 1-7 and a single-chip microcomputer, wherein, the first end of the key switch circuit is connected with the first end of the isolation circuit, the second end of the key switch circuit is connected with the second end of the isolation circuit, the key switch circuit is internally provided with a plurality of function keys, when any one of the function keys is pressed, the key switch circuit outputs a voltage with a corresponding amplitude to the isolation circuit; the third end of the isolation circuit inputs a supply voltage, the fourth end of the isolation circuit is connected with the first end of the voltage sampling circuit, and the isolation circuit is used for realizing electrical isolation between the key switch circuit and the single-chip microcomputer; the second end of the voltage sampling circuit is grounded, and the third end and the fourth end of the voltage sampling circuit are both connected with the host; after the single-chip microcomputer controls the voltage sampling circuit to be turned on, the voltage sampling circuit collects the voltage at the fourth end of the isolation circuit and outputs the voltage to the single-chip microcomputer, the single-chip microcomputer identifies the amplitude of the output voltage of the voltage sampling circuit and executes a corresponding function.

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