Control circuit of plasma cutting machine

Abstract

The utility model discloses a plasma cutting machine's control circuit, including rectifier filter module and 110V / 220V judgment switching module, rectifier filter module includes connecting network pin CON1 and the bridge rectifier BD1 of the second leg of 220V power supply, 110V / 220V judgment switching module includes connecting bridge rectifier BD1, network pin CON2 and the relay J1 of the pin 4 of the first leg of 220V power supply, the relay J1 is connected with the bridge rectifier BD1, network pin CON2 and the relay J1 of the pin 4 of the first leg of 220V power supply. The relay J2 is connected with a pin 4 of the relay J1, a capacitor C1 is connected in series between the pin 4 of the relay J2 and a pin 3 of the bridge rectifier BD1, and a diode D4 is connected in series between a pin 1 of the relay J2 and a pin 2 of the relay J2. Compared with the prior art, the utility model has the advantages that: through the arrangement of the two relays, the power supply state can be monitored and protected in real time in the power supply switching process, the safety threat of circuit faults to a power system is effectively prevented, and more stable and safer power supply switching is provided; and the device is suitable for occasions with relatively high requirements on power supply switching.

Description

Technical Field

[0001] This utility model relates to the field of cutting machine technology, to plasma cutting machines, and particularly to the control circuit of plasma cutting machines. Background Technology

[0002] To adapt to power standards in different countries and regions, meet the needs of different users, and improve the applicability and safety of the equipment, plasma cutting machines are equipped with a 110V and 220V switching function in the circuit.

[0003] For example, the patent with authorization announcement number CN201717797U provides an automatic switching circuit for the input voltage of plasma cutting in an inverter multi-purpose arc welding machine, which only uses a relay to automatically control the voltage switching between 100V and 220V.

[0004] However, in this configuration, the relay coil can be connected to a 220V power supply, while the contacts control the switching between 110V and 220V power supplies. Since there is only one relay, the switching action is synchronous, that is, when the relay coil is energized or de-energized, both sets of contacts operate simultaneously. This may cause a brief power interruption, which may not be suitable for some sensitive loads and is not suitable for applications with high requirements for power continuity. Utility Model Content

[0005] This invention addresses the problem that existing plasma cutting machines with only one relay in their 110V and 220V automatic switching circuits are unsuitable for applications requiring high power continuity. The technical problem this invention aims to solve is to provide a control circuit for plasma cutting machines that uses two relays to achieve a design suitable for applications with high power switching requirements.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a control circuit for a plasma cutting machine, including a rectifier and filter module and a 110V / 220V judgment and switching module;

[0007] The rectifier and filter module includes a rectifier bridge BD1. Pin 2 of the rectifier bridge BD1 is connected to the network pin CON1 and the second pin of the 220V power supply. Pin 3 of the rectifier bridge BD1 is connected to the 310V power supply pin, and pin 1 of the rectifier bridge BD1 is connected to the internal ground OV.

[0008] The 110V / 220V judgment and switching module includes a relay J1. Pin 4 of the rectifier bridge BD1 is connected to pin 4 of the relay J1, and pin 3 of the relay J1 is connected to the network pin CON2 and the first pin of the 220V power supply.

[0009] The pin 3 of the relay J1 is connected with the pin 4 in series with a thermistor RT1, the pin 2 of the relay J1 is connected with a 24V power supply, the pin 1 of the relay J1 is connected with the pin 2 in series with a diode D3, and the pin 1 of the relay J1 is connected with the pin 2 of a transistor Q2, the pin 3 of the transistor Q2 is connected with a ground GND, and the pin 1 of the transistor Q2 is connected with a diode D1, a capacitor C14, a resistor R23 and a resistor R24, wherein the capacitor C14 and the resistor R24 are each connected with the ground GND, the diode D1 and the resistor R23 are each connected with the 24V power supply;

[0010] The 110V / 220V judgment switching module further comprises a relay J2, the pin 3 of the relay J2 is connected with the pin 4 of the relay J1, and the pin 4 of the relay J2 is connected with the pin 3 of the rectifier bridge stack BD1 in series with a capacitor C1.

[0011] The pin 1 of the relay J2 is connected with the pin 2 of the relay J2 in series with a diode D4, the pin 1 of the relay J2 is connected with a 24V power supply, the diode D4 is guided to the pin 2 of the relay J2 to flow to the pin 1 of the relay J2 and the 24V power supply, the pin 2 of the relay J2 is connected with the pin 2 of a transistor Q3, a resistor R28 and a diode D6, the resistor R28 and the diode D6 are connected in parallel, the resistor R28 and the diode D6 connected in parallel are connected with a resistor R29, a capacitor C17 and a diode Z2, the resistor R29 and the capacitor C17 are each connected with the ground GND, the diode Z2 is connected with the pin 2 of a transistor Q1, the pin 1 of the transistor Q1 is connected with the ground GND, a resistor R43 is connected with the pin 5 of a connector P5, the pin 3 of the transistor Q3 is connected with the ground GND, the pin 1 of the transistor Q3 is connected with a capacitor C16, a diode D5, a resistor R26, a resistor R27, the pin 3 of the transistor Q1 and the pin 4 of an optoelectronic coupler U1, the capacitor C16 and the resistor R27 are each connected with the ground GND, the diode D5 and the resistor R26 are each connected with the 24V power supply, the pin 1 of the optoelectronic coupler U1 and the pin 2 of the optoelectronic coupler U1 are connected in series with a capacitor C15, the pin 2 of the optoelectronic coupler U1 is connected with a first branch of a 220V power supply, the pin 1 of the optoelectronic coupler U1 is connected with a diode Z1, the diode Z1 is connected with a pressure-sensitive resistor RV3, the pressure-sensitive resistor RV3 is connected with a resistor R25, the resistor R25 is connected with a diode D2, and the diode D2 is connected with a second branch of the 220V power supply.

[0012] A further preferred embodiment of the utility model discloses: the diode D3 restricts the current from the pin 1 of the relay J1 to the pin 2 of the relay J1.

[0013] A further preferred embodiment of the utility model discloses: the diode D1 restricts the current from the pin 1 of the transistor Q2 to the 24V power supply.

[0014] The further preferred scheme of the utility model is that the diode D4 limits the current flowing from the pin 2 of the relay J2 to the pin 1 of the relay J2.

[0015] The further preferred scheme of the utility model is that the diode D5 limits the current flowing from the pin 1 of the transistor Q3 to the 24V power supply.

[0016] The further preferred scheme of the utility model is that the diode D6 and the diode Z2 limit the current flowing in the same direction, from the pin 2 of the transistor Q1 to the pin 2 of the relay J2.

[0017] The further preferred scheme of the utility model is that the diode Z1 limits the current flowing from the pin 1 and the pin 2 of the photoelectric coupler U1 to the piezoresistor RV3.

[0018] The further preferred scheme of the utility model is that the diode D2 limits the current flowing from the second branch of the 220V power supply to the resistor R25.

[0019] The further preferred scheme of the utility model is that the rectification filter module comprises the resistor R1 and the capacitor C1' connected in parallel with the capacitor C1, the capacitor C2 is connected in series between the capacitor C1 and the pin 1 of the rectifier bridge stack BD1, the resistor R2 and the capacitor C2' are connected in parallel on the capacitor C2, the resistor R1 is connected in series with the resistor R2, and the capacitor C1' is connected in series with the capacitor C2'.

[0020] The further preferred scheme of the utility model is that the rectification filter module further comprises the resistor R3 and the capacitor C3 connected in parallel, and the resistor R4 and the capacitor C4 connected in parallel, the resistor R3 is connected in series with the resistor R4, the capacitor C3 is connected in series with the capacitor C4, the resistor R3, the capacitor C3, the resistor R4 and the capacitor C4 are connected with the pin QB, the capacitor C9 is connected in parallel on the series-connected capacitor C1' and the capacitor C2', and the capacitor C9 is connected in parallel with the series-connected resistor R3 and the resistor R4.

[0021] Compared with the prior art, the utility model has the advantages that in the plasma cutting machine, the relay J1 and the relay J2 are arranged, during the switching process of the 110V and 220V power supply, the two relays can monitor and protect the power supply state in real time, effectively prevent the circuit failure from threatening the safety of the power system, provide more stable and safer power supply switching, and are suitable for occasions with high requirements for power supply switching. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model will be further described in detail below in combination with the drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the utility model, in addition, unless specifically indicated, the drawings only schematically show the composition or structure of the described object conceptually and can contain exaggerated display, and the drawings are not necessarily drawn to scale.

[0023] Figure 1 The circuit diagram of the control circuit of the preferred embodiment of the utility model;

[0024] Figure 2 The circuit diagram of the rectification filtering module and 110V / 220V judging switching module of the preferred embodiment of the utility model;

[0025] Figure 3 The circuit diagram of the inverter module and buzzer MK1 connection of the preferred embodiment of the utility model;

[0026] Figure 4 The circuit diagram of the step-down module and buzzer MK1 connection of the preferred embodiment of the utility model

[0027] Figure 5 The circuit diagram of the step-down module connecting secondary rectification module and high-frequency module of the preferred embodiment of the utility model;

[0028] Figure 6 The circuit diagram of the buzzer MK1 and connector P5 of the preferred embodiment of the utility model;

[0029] Figure 7 The circuit diagram of the gun switch module of the preferred embodiment of the utility model;

[0030] Figure 8 The circuit diagram of the switch power supply module of the preferred embodiment of the utility model.

[0031] In the drawings: 1, rectification filtering module; 2, 110V / 220V judging switching module; 3, inverter module; 4, step-down module; 5, secondary rectification module; 6, high-frequency module; 7, gun switch module; 8, switch power supply pin module. DETAILED DESCRIPTION

[0032] The preferred embodiments of the utility model will be described in detail below with reference to the drawings, and those skilled in the art will appreciate that these descriptions are only descriptive, exemplary and should not be interpreted as limiting the protection scope of the utility model.

[0033] It should be noted that: similar reference numerals represent similar items in the following drawings, therefore, once an item is defined in one drawing, it can not be further defined and explained in the subsequent drawings.

[0034] The embodiment mainly illustrates the control circuit of the plasma cutting machine which is suitable for the occasions with high requirements for power switching by setting two relays, and specifically as follows:

[0035] As shown in the figure, the automatic switching circuit of the plasma cutting machine 100V and 220V includes a rectifier filter module 1 and a 110V / 220V judgment switching module 2 connected with the rectifier filter module 1. Figures 1-2 The rectifier filter module 1 includes a first leg of the 220V power pin, a second leg of the 220V power pin and a rectifier bridge stack BD1, the second leg of the 220V power pin is connected with a network pin CON1 and a pin 2 of the rectifier bridge stack BD1, the first leg of the 220V power pin is connected with a network pin CON2 and a thermistor RT1, the thermistor RT1 is connected in series between the network pin CON2 / the first leg of the 220V power pin and a pin 4 of the rectifier bridge stack BD1, a pin 3 of the rectifier bridge stack BD1 is connected with a 310V power pin, and a pin 1 of the rectifier bridge stack BD1 is connected with an internal ground OV.

[0036] The pin 1 of the rectifier bridge stack BD1 and the pin 3 of the rectifier bridge stack BD1 are connected with a series connection of a capacitor C1 and a capacitor C2, a series connection of a resistor R1 and a resistor R2, a series connection of a capacitor C1' and a capacitor C2', a capacitor C9, a series connection of a resistor R3 and a resistor R4, and a series connection of a capacitor C3 and a capacitor C4, wherein the resistor R1, the capacitor C1' and the capacitor C1 are connected in parallel, the capacitor C2, the resistor R2 and the capacitor C2' are connected in parallel, the resistor R3 and the capacitor C3 are connected in parallel, the resistor R4 and the capacitor C4 are connected in parallel, the series connection of the capacitor C1' and the capacitor C2' is connected in parallel with the capacitor C9, the capacitor C9 is connected in parallel with the resistor R3 and the resistor R4, and the resistor R3, the capacitor C3, the resistor R4 and the capacitor C4 are connected with a pin QB.

[0037] The 110V / 220V judgment switching module 2 includes a relay J1 and a relay J2, the thermistor RT1 is connected in series between a pin 3 and a pin 4 of the relay J1, a pin 4 of the rectifier bridge stack BD1 is connected with a pin 4 of the relay J1 and a pin 3 of the relay J2, the capacitor C1 is connected in series between a pin 3 of the rectifier bridge stack BD1 and a pin 4 of the relay J2, and the capacitor C2 is connected in series between a pin 1 of the rectifier bridge stack BD1 and a pin 4 of the relay J2.

[0038]

[0039] ​The pin 2 of the relay J1 is connected to the 24V power supply pin, the pin 1 of the relay J1 is connected in series with the pin 2 of the relay J1 with the diode D3, and the pin 1 of the relay J1 is connected to the pin 2 of the transistor Q2, the pin 3 of the transistor Q2 is connected to the ground GND, and the pin 1 of the transistor Q2 is connected to the diode D1, the capacitor C14, the resistor R23 and the resistor R24, wherein the capacitor C14 and the resistor R24 are each connected to the ground GND, the diode D1 and the resistor R23 are each connected to the 24V power supply pin, the diode D1 limits the current flowing from the pin 1 of the transistor Q2 to the 24V power supply pin, and the diode D3 limits the current flowing from the pin 1 of the relay J1 to the pin 2 of the relay J1.

[0040] The pin 1 of the relay J2 is connected in series with the pin 2 of the relay J2 with the diode D4, the pin 1 of the relay J2 is connected to the 24V power supply pin, the diode D4 directs the current flowing from the pin 2 of the relay J2 to the pin 1 of the relay J2 and the 24V power supply pin, the pin 2 of the relay J2 is connected to the pin 2 of the transistor Q3, the resistor R28 and the diode D6 in parallel, the resistor R28 and the diode D6 are connected to the resistor R29, the capacitor C17 and the diode Z2, the resistor R29 and the capacitor C17 are each connected to the ground GND, the diode Z2 is connected to the pin 2 of the transistor Q1, the pin 1 of the transistor Q1 is connected to the ground GND, the resistor R43 is connected to the pin 5 of the connector P5, the pin 3 of the transistor Q3 is connected to the ground GND, the pin 1 of the transistor Q3 is connected to the capacitor C16, the diode D5, the resistor R26, the resistor R27, the pin 3 of the transistor Q1 and the pin 4 of the optocoupler U1, the capacitor C16 and the resistor R27 are each connected to the ground GND, the diode D5 and the resistor R26 are each connected to the 24V power supply pin, the pin 1 of the optocoupler U1 is connected in series with the pin 2 of the optocoupler U1 with the capacitor C15, the pin 2 of the optocoupler U1 is connected to the first branch of the 220V power supply pin, the pin 1 of the optocoupler U1 is connected to the diode Z1, the diode Z1 is connected to the voltage-dependent resistor RV3, the voltage-dependent resistor RV3 is connected to the resistor R25, the resistor R25 is connected to the diode D2, and the diode D2 is connected to the second branch of the 220V power supply pin.

[0041] Among them, the diode D4 limits the current flowing from the pin 2 of the relay J2 to the pin 1 of the relay J2, the diode D5 limits the current flowing from the pin 1 of the transistor Q3 to the 24V power supply pin, the diodes D6 and Z2 limit the current flowing in the same direction, from the pin 2 of the transistor Q1 to the pin 2 of the relay J2, the diode Z1 limits the current flowing from the pin 1 and the pin 2 of the optocoupler U1 to the voltage-dependent resistor RV3, and the diode D2 limits the current flowing from the second branch of the 220V power supply pin to the resistor R25.

[0042] The application discloses a plasma cutting machine, which is characterized by the following technical scheme.

[0043] As shown in Figures 1-3 The rectification filter module 1 is connected with the inversion module 3, the inversion module 3 comprises the transistor Q4 and the transistor Q6 connected in series between the pin 1 of the rectification bridge stack BD1 and the pin 3 of the rectification bridge stack BD1, and the transistor Q5 and the transistor Q7 connected in series between the pin 1 of the rectification bridge stack BD1 and the pin 3 of the transistor Q6, the pin 3 of the transistor Q6 is connected with the pin 3 of the transistor Q7 and the pin 1 of the rectification bridge stack BD1, the pin 3 of the transistor Q6, the pin 2 of the transistor Q4 and the pin 2 of the transistor Q5 are connected, and the pin 3 of the transistor Q4, the pin 3 of the transistor Q5, the pin 2 of the transistor Q6 and the pin 2 of the transistor Q7 are connected.

[0044] The pin 1 of the transistor Q4 is connected with the resistor R19, the pin 1 of the transistor Q5 is connected with the resistor R20, the resistor R20 and the resistor R19 are connected in series, and the resistor R20 and the resistor R19 are connected with the resistor R21, the capacitor C8, the resistor R18 and the resistor R22, the resistor R21 is connected with the capacitor C8 in parallel, the resistor R18 is connected with the diode D8 in series, the resistor R22 is connected with the diode D8 in parallel with respect to the resistor R18, the parallel resistor R21 and the capacitor C8 are connected with the pin 3 of the transistor Q4, the pin 3 of the transistor Q5, the pin 2 of the transistor Q6, the pin 2 of the transistor Q7 and the pin S2, and the diode D8 and the resistor R22 are connected with the pin G2, and the diode D8 limits the current flowing from the resistor R18 to the pin G2.

[0045] The pin 1 of the transistor Q6 is connected with the resistor R14, the pin 1 of the transistor Q7 is connected with the resistor R13, the resistor R14 and the resistor R13 are connected in series, and the resistor R14 and the resistor R13 are connected with the resistor R15, the capacitor C7, the resistor R17 and the resistor R16, the capacitor C7 and the resistor R17 are connected in parallel, the resistor R15 is connected with the diode D7 in series, the resistor R16 is connected with the diode D7 in parallel with respect to the resistor R15, the parallel capacitor C7 and the resistor R17 are connected with the pin 3 of the transistor Q6, the pin 3 of the transistor Q7, the pin 1 of the rectification bridge stack BD1 and the pin S1, the diode D7 and the resistor R16 are connected with the pin G1, and the diode D7 limits the current flowing from the resistor R15 to the pin G1.

[0046] The transistor Q5 is connected in series with a resistor R5, a resistor R6 and a capacitor C5, wherein the resistor R6 is connected in series between the resistor R5 and the capacitor C5, the resistor R5 is connected to the pin 2 of the transistor Q5, and the capacitor C5 is connected to the pin 3 of the transistor Q5; the transistor Q7 is connected in series with a resistor R7, a resistor R8 and a capacitor C6, wherein the resistor R8 is connected in series between the resistor R7 and the capacitor C6, the resistor R7 is connected to the pin 2 of the transistor Q7, and the capacitor C6 is connected to the pin 3 of the transistor Q7.

[0047] As shown in Figures 1-4 The inverter module 3 is connected to the voltage reduction module 4, and the voltage reduction module 4 comprises a transformer T1, the pin 1 of the transformer T1 is connected to the pin 1 of the transformer T1, the pin 1 of the transformer T1 is connected to the capacitor C5, the resistor R7, the pin 3 of the transistor Q4, the pin 3 of the transistor Q5, the pin 2 of the transistor Q6 and the pin 2 of the transistor Q7.

[0048] The pin 2 of the transformer T1 is connected to the pin 2 of the transformer T1, the pin 1 of the transformer T2 is connected to the pin 2 of the transformer T2, the pin 4 of the transformer T2 is connected to the diode D27 and the diode D28, the diode D28 is connected to the ground GND, the pin 3 of the transformer T2 is connected to the diode D26 and the diode D25, the diode D25 is connected to the ground GND, the diode D26 is connected to the resistor R59, the resistor R60, the resistor R61 and the resistor R62, the resistor R59, the resistor R60 and the resistor R61 are each connected to the ground GND, and the resistor R62 is connected to the capacitor C33 and the pin 12 of the buzzer MK1, and the capacitor C33 is connected to the ground GND.

[0049] Preferably, the diode D25 is directed to the ground GND to the pin 3 of the transformer T2 and the diode D26, the diode D26 is directed to the pin 3 of the transformer T2 to the resistor R59, the resistor R60, the resistor R61 and the resistor R62, the diode D28 is directed to the ground GND to the pin 4 of the transformer T2 and the diode D27, and the diode D27 is consistent with the diode D26.

[0050] The pin 15 of the buzzer MK1 is connected to the pin 5 of the transformer T3, and the pin 18 of the buzzer MK1 is connected to the resistor R64, the capacitor C34 and the capacitor C35, the resistor R64, the capacitor C34 and the capacitor C35 are connected in parallel, and the parallel resistor R64, the capacitor C34 and the capacitor C35 are connected to the pin 6 of the transformer T3,

[0051] The pin 1 of the transformer T3 is connected to the pin S2, the pin 2 of the transformer T3 is connected to the pin G2, the pin 9 of the transformer T3 is connected to the pin G1, and the pin 10 of the transformer T3 is connected to the pin S1.

[0052] As shown in Figures 1-5As shown, the step-down module 4 is connected to the secondary rectifier module 5. Pin 3 of transformer T1 is connected to resistor R9, pin 3 of diode D13, pin 1 of diode D13, resistor R9', pin 2 of diode D14. Resistor R9 is connected to capacitor C11. Capacitor C11 is connected to capacitor C10, pin 2 of diode D13, the positive terminal of the output voltage, capacitors C43, C41, C42, resistors R63, R65, R66, R67, R68, and varistor RV1. Capacitor C43 is connected to pin WH. Capacitor C42, resistor... Resistors R63, R65, R66, R67, and R68 are connected in parallel with varistor RV1. The parallel capacitor C42, resistors R63, R65, R66, R67, and R68, along with varistor RV1, are connected to pin 2 of shunt resistor FLQ, inductor L1, and ground GND. Resistor R9' is connected to capacitor C11', which is connected to pin 3 of diode D14, pin 1 of diode D14, pin 3 of diode D15, pin 1 of diode D15, capacitor C12', and pin 2 of inductor L3.

[0053] Pin 6 of transformer T1 is connected to pin 2 of diode D15, resistor R10', pin 3 of diode D16, pin 1 of diode D16, and resistor R10. Resistor R10' is connected to capacitor C12'. Capacitor C12 is connected in series between pin 2 of diode D16 and resistor R10. Capacitor C12', pin 3 of diode D15, and pin 1 of diode D15 are connected to pin 2 of inductor L3. Pin 1 of inductor L3 is connected to pin 4 of inductor L3. Pin 3 of inductor L3 is connected to pin FLQ and pin 1 of shunt resistor FLQ. Pin 2 of shunt resistor FLQ is connected to inductor L1 and ground GND. Inductor L1 is connected to the negative terminal VOUT- of the output voltage.

[0054] like Figures 1-6 As shown, the step-down module 4 is also connected to the high-frequency module 6. The pin 8 of the transformer T1 is connected to the capacitor C32 and the resistor R58. The capacitor C32 and the resistor R58 are connected in parallel. The parallel capacitor C32 and the resistor R58 are connected to the pin 2 of the transformer T5. The pin 3 of the transformer T5 is connected to the resistor R57. The resistor R57 is connected to the circuit breaker FDZ and the capacitor C31. The capacitor C31 is connected to the pin 1 of the connector P7. The pin 4 of the transformer T5 and the pin 3 of the connector P7 are connected to the circuit breaker FDZ.

[0055] Pin 1 of transformer T5 is connected to pin 4 of relay K3, pin 7 of transformer T1 is connected to pin 3 of relay K3, pin 1 of relay K3 is connected to diode D20 and 24V power supply pin, pin 2 of relay K3 is connected to diode D20 and pin 9 of buzzer MK1, diode D20 is directed to pin 2 of relay K3 to pin 1 of relay K3.

[0056] Pin 5 of buzzer MK1 is connected in series with pin 2 of relay J2 through diode D17 and resistor R43, diode D17 is directed to pin 2 of relay J2 through resistor R43.

[0057] Pin 1 of buzzer MK1 is connected to ground GND, pin 7 of buzzer MK1 is connected to capacitor C30, resistor R54, resistor R55 and pin 1 of connector P6, pin 2 of connector P6 is connected to 15V power supply pin, capacitor C30, resistor R54 and resistor R55 are each connected to ground GND,

[0058] Pin 2 of buzzer MK1 is connected to FLQ pin, pin 3 of buzzer MK1 is connected in series with pin 8 of connector P5 through resistor R53 and potentiometer RP3,

[0059] Pin 5 of buzzer MK1 is connected in series with pin 3 of connector P5 through resistor R70, optocoupler U3 and capacitor C44, wherein resistor R70 is connected to pin 5 of buzzer MK1 and pin 4 of optocoupler U3, pin 3 of optocoupler U3 is connected to ground GND, capacitor C44 is connected in series between pin 1 of optocoupler U3 and pin 2 of optocoupler U3, pin 1 of optocoupler U3 is connected to resistor R69, resistor R69 is connected to 15V power supply pin, capacitor C44 is connected to pin 2 of optocoupler U3 and pin 3 of connector P5,

[0060] Pin 6 of buzzer MK1 is connected to capacitor C29 and pin 2 of transistor Q10, capacitor C29 and pin 1 of transistor Q10 are each connected to ground GND, pin 3 of transistor Q10 is connected to resistor R52, and resistor R52 is connected to pin 7 of connector P5,

[0061] Pin 10 of buzzer MK1 is connected in series with pin 6 of connector P5 through diode D21 and resistor R51,

[0062] Pin 1 of connector P5 is connected to resistor R50, resistor R50 is connected to resistor R49 and pin 1 of transistor Q9, resistor R49 and pin 3 of transistor Q9 are each connected to ground GND, pin 2 of transistor Q9 is connected to diode D24 and pin 2 of connector P2, diode D24 and pin 1 of connector P2 are each connected to 24V power supply pin,

[0063] AsFigure 1 and Figure 7 As shown in the figure, the connector P5 is connected with the gun switch module 7, the pin 4 of the connector P5 is connected with the resistor R48, the resistor R48 is connected with the diode D23, the diode D24 is connected with the resistor R47 and the pin 3 of the transistor Q8, the pin 1 of the transistor Q8 is connected with the ground GND, the pin 2 of the transistor Q8 is connected with the resistor R45 and the resistor R46, the resistor R46 is connected with the ground GND, the resistor R45 is connected with the diode D22, the capacitor C36, the capacitor C37, the resistor R44, the capacitor C38 and the potentiometer RP2, the resistor R44 and the capacitor C36 are each connected with the ground GND, the diode D22 is connected with the 24V power supply pin, the capacitor C37 and the capacitor C38 are connected in parallel,

[0064] The capacitor C38 is connected with the potentiometer RP1 and the 24V power supply pin, the potentiometer RP1 is connected with the pin 2 of the inductor L2, the potentiometer RP2 is connected with the pin 3 of the inductor L2, the pin 1 of the inductor L2 is connected with the capacitor C39 and the pin 3 of the connector P1, the capacitor C39 is connected with the ground SGND, the pin 4 of the inductor L2 is connected with the capacitor C40 and the pin 1 of the connector P1, the capacitor C40 is connected with the ground SGND.

[0065] As shown in the figure, Figure 1 and Figure 8 The above-mentioned circuits can be integrated on the circuit board, and the circuit board is also provided with the switching power supply module 8.

[0066] The pin 1 of the connector P3 is connected with the ground GND1, the pin 2 is connected with the first branch of the 15V power supply pin, the pin 3 is connected with the ground GND, and the pin 4 is connected with the 15V power supply pin.

[0067] The pin 1 of the transformer T4 is connected with the capacitor C25, the resistor R30, the resistor R33 and the triode P8 with four pins,

[0068] The capacitor C25 and the resistor R30 are connected in parallel, the parallel capacitor C25 and the resistor R30 are connected with the same diode D12, the diode D12 is connected with the pin 4 of the transformer T4, and the diode D12 conducts the pin 4 of the transformer T4 to the pin 1 of the chip U4,

[0069] The pin 1 of the transformer T4 is connected with the pin 2 of the triode P8, the pin 1 of the triode P8 is connected with the 310V power supply pin, and the pin 4 of the triode P8 is connected with the internal ground OV,

[0070] The resistor R33 is connected with the resistor R34, the resistor R34 is connected with the resistor R35, the resistor R35 is connected with the resistor R36 and the polar capacitor C18, the resistor R36 and the polar capacitor C18 are each connected with the internal ground OV,

[0071] Pin 4 of transformer T4 is connected to pin 5, pin 6, pin 7 and pin 8 of chip U4, pin 5, pin 6, pin 7 and pin 8 of chip U4 are connected in parallel,

[0072] Pin 1 of chip U4 is connected to internal ground OV, pin 2 of chip U4 is connected to resistor R37, resistor R38 and resistor R39, resistor R37, resistor R38 and resistor R39 are connected in parallel, and resistor R37, resistor R38 and resistor R39 are connected to the same internal ground OV,

[0073] Pin 3 of chip U4 is connected to capacitor C19, resistor R36, polarized capacitor C18 and pin 6 of transformer T4, capacitor C19 is connected to internal ground OV, resistor R31 and diode D11 are connected in series between pin 6 of transformer T4 and pin 3 of chip U4, diode D11 conducts current from pin 6 of transformer T4 to pin 3 of chip U4,

[0074] Pin 4 of chip U4 is connected to pin 4 of optocoupler U2 and capacitor C26, pin 3 of optocoupler U2 and capacitor C26 are connected to the same internal ground OV,

[0075] Pin 1 of optocoupler U2 is connected to resistor R40 and capacitor C20, capacitor C20 is connected to ground GND, resistor R40 is connected to zener diode Z3, zener diode Z3 is connected to 15V power supply pin, zener diode Z3 conducts current from resistor R40 to 15V power supply pin,

[0076] Pin 2 of optocoupler U2 is connected to ground GND,

[0077] Pin 7 of transformer T4 is connected to internal ground OV, pin 8 of transformer T4 is connected to ground GND,

[0078] Pin 10 of transformer T4 is connected to diode D10 and diode D29, diode D10 and diode D29 are connected in parallel, diode D10 and diode D29 connected in parallel are connected to resistor R41, capacitor C21, polarized capacitor C24 and 15V power supply pin, resistor R41, capacitor C21 and polarized capacitor C24 are each connected to ground GND,

[0079] Pin 11 of transformer T4 is connected to diode D9 and diode D19, diode D9 and diode D19 are connected in parallel, diode D9 and diode D19 connected in parallel are connected to resistor R42, capacitor C22, polarized capacitor C23 and 24V power supply pin, resistor R42, capacitor C22 and polarized capacitor C23 are each connected to ground GND,

[0080] Pin 13 of transformer T4 is connected to ground GND,

[0081] Pin 14 of transformer T4 is connected with diode D18, and diode D18 is connected with resistor R56, capacitor C27, polarized capacitor C28 and 15V power supply pin, diode D18 is connected with resistor R56 and capacitor C27 respectively with polarized capacitor C283 connected with ground GND1.

[0082] 15V power supply pin is connected with resistor R32, and resistor R32 is connected with light emitting diode VD1, diode VD1 is connected with ground GND, and light emitting diode VD1 is guided to resistor R32 to flow to ground GND.

[0083] Pin 1 of connector P4 is connected with ground GND, and pin of connector P4 is connected with 24V power supply pin.

[0084] In the description of the utility model, it is explained that the terms "upper", "lower", "front", "rear", "inner", "outer" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly used when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation of the utility model.

[0085] The control circuit of the plasma cutting machine provided by the utility model is described in detail above, the principle and implementation mode of the utility model are described in this paper by applying specific examples, the above embodiment is only used to help understand the utility model and core idea, it should be pointed out that for ordinary skilled personnel in the technical field, the utility model can be improved and modified on the premise of not departing from the principle of the utility model, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. Control circuit of plasma cutting machine, comprising rectification filter module and 110V / 220V judgment switching module; characterized in that The rectification filter module comprises rectifier bridge stack BD1, pin 2 of rectifier bridge stack BD1 is connected with network pin CON1 and the second pin of 220V power supply, pin 3 of rectifier bridge stack BD1 is connected with 310V power supply pin, and pin 1 of rectifier bridge stack BD1 is connected with internal ground OV; The 110V / 220V judgment switching module comprises relay J1, pin 4 of rectifier bridge stack BD1 is connected with pin 4 of relay J1, and pin 3 of relay J1 is connected with network pin CON2 and the first pin of 220V power supply; Pin 3 and pin 4 of relay J1 are connected in series with thermistor RT1, pin 2 of relay J1 is connected with 24V power supply, diode D3 is connected in series with pin 1 and pin 2 of relay J1, pin 1 of relay J1 is connected with pin 2 of transistor Q2, pin 3 of transistor Q2 is connected with ground GND, pin 1 of transistor Q2 is connected with diode D1, capacitor C14, resistor R23 and resistor R24, wherein capacitor C14 and resistor R24 are each connected with ground GND, diode D1 and resistor R23 are each connected with 24V power supply; The 110V / 220V judgment switching module further comprises relay J2, pin 3 of relay J2 is connected with pin 4 of the relay J1, and capacitor C1 is connected in series between pin 4 of relay J2 and pin 3 of rectifier bridge stack BD1; Diode D4 is connected in series between pin 1 of relay J2 and pin 2 of relay J2, pin 1 of relay J2 is connected with 24V power supply, diode D4 directs the flow from pin 2 of relay J2 to pin 1 of relay J2 and 24V power supply, pin 2 of relay J2 is connected with pin 2 of transistor Q3, resistor R28 and diode D6, resistor R28 and diode D6 are connected in parallel, the parallel resistor R28 and diode D6 are connected with resistor R29, capacitor C17 and diode Z2, resistor R29 and capacitor C17 are each connected with ground GND, diode Z2 is connected with pin 2 of transistor Q1, pin 1 of transistor Q1 is connected with ground GND, resistor R43 is connected with pin 5 of connector P5, pin 3 of transistor Q3 is connected with ground GND, pin 1 of transistor Q3 is connected with capacitor C16, diode D5, resistor R26, resistor R27, pin 3 of transistor Q1 and pin 4 of photoelectric coupler U1, capacitor C16 and resistor R27 are each connected with ground GND, diode D5 and resistor R26 are each connected with 24V power supply, capacitor C15 is connected in series between pin 1 of photoelectric coupler U1 and pin 2 of photoelectric coupler U1, pin 2 of photoelectric coupler U1 is connected with the first branch of 220V power supply, pin 1 of photoelectric coupler U1 is connected with diode Z1, diode Z1 is connected with pressure sensitive resistor RV3, pressure sensitive resistor RV3 is connected with resistor R25, resistor R25 is connected with diode D2, diode D2 is connected with the second branch of 220V power supply.

2. The control circuit for a plasma torch as defined in claim 1 wherein, The diode D3 limits the current flowing from the pin 1 of the relay J1 to the pin 2 of the relay J1.

3. The control circuit for a plasma torch as defined in claim 1 wherein, The diode D1 limits the current flowing from the pin 1 of the transistor Q2 to the 24V power supply.

4. The control circuit for a plasma torch as defined in claim 1 wherein, The diode D4 limits the current flowing from the pin 2 of the relay J2 to the pin 1 of the relay J2.

5. The control circuit for a plasma torch as defined in claim 1 wherein, The diode D5 limits the current flowing from the pin 1 of the transistor Q3 to the 24V power supply.

6. The control circuit for a plasma torch as defined in claim 1 wherein, The diode D6 and the diode Z2 limit the current flowing from the pin 2 of the transistor Q1 to the pin 2 of the relay J2.

7. The control circuit for a plasma torch as defined in claim 1 wherein, The diode Z1 limits the current flowing from the pin 1 and the pin 2 of the photoelectric coupler U1 to the piezoresistor RV3.

8. The control circuit for a plasma torch as defined in claim 1 wherein, The diode D2 limits the current flowing from the second branch of the 220V power supply to the resistor R25.

9. The control circuit for a plasma torch as defined in claim 1 wherein, The rectification and filtering module comprises the resistor R1 and the capacitor C1' connected in parallel, the capacitor C1 is connected in series with the pin 1 of the rectification bridge stack BD1, and the capacitor C2 is connected in series with the capacitor C1, the resistor R2 and the capacitor C2' are connected in parallel on the capacitor C2, the resistor R1 is connected in series with the resistor R2, the capacitor C1' is connected in series with the capacitor C2', and the capacitor C9 is connected in parallel on the series-connected capacitor C1' and the capacitor C2' relative to the series-connected resistor R3 and the resistor R4.

10. The control circuit for a plasma torch as defined in claim 9 wherein, The rectification and filtering module further comprises the resistor R3 and the capacitor C3 connected in parallel, and the resistor R4 and the capacitor C4 connected in parallel, the resistor R3 is connected in series with the resistor R4, the capacitor C3 is connected in series with the capacitor C4, the resistor R3, the capacitor C3, the resistor R4 and the capacitor C4 are connected to the pin QB, and the capacitor C9 is connected in parallel on the series-connected capacitor C1' and the capacitor C2' relative to the series-connected resistor R3 and the resistor R4.

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