CN215431967U - Control circuit of direct current motor drive type welding gun - Google Patents
Control circuit of direct current motor drive type welding gun Download PDFInfo
- Publication number
- CN215431967U CN215431967U CN202121726137.7U CN202121726137U CN215431967U CN 215431967 U CN215431967 U CN 215431967U CN 202121726137 U CN202121726137 U CN 202121726137U CN 215431967 U CN215431967 U CN 215431967U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistor
- welding gun
- electrically connected
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Arc Welding Control (AREA)
Abstract
The utility model discloses a control circuit of a direct current motor-driven welding gun, which comprises a main circuit, a main circuit driving circuit and a current regulating circuit, wherein the main circuit is a loop formed by connecting a power supply and a welding gun control line in series, the main circuit driving circuit comprises resistors R1 and R2 and a switching tube Q2, and the current regulating circuit comprises a current sampling circuit a, a comparator U1, a large current circuit, a small current circuit and a time delay circuit. The control circuit provided by the utility model can realize the driving work of the welding gun under the direct-current power supply, is suitable for a wide working voltage range, especially can realize the large-current promotion and small-current maintenance, can effectively avoid the heating problem of the welding gun during working, can effectively solve the voltage drop problem caused by overlong welding gun line, and avoids the defects of weak signal and insensitive control; the key point is that the control circuit can be realized by only common simple components and parts, and has the advantages of low cost, easy realization, reliable working performance and the like.
Description
Technical Field
The utility model relates to a control circuit of a direct current motor-driven welding gun, belonging to the technical field of welding gun circuits.
Background
Arc stud welding is a high-efficiency and high-quality stud welding method. The welding gun is a direct execution mechanism for realizing stud welding, and the quality of the welding gun has great influence on the stud welding quality.
A traditional welding gun for arc stud welding is mainly an electromagnetic type welding gun, a main shaft body driving mechanism of the welding gun is of an electromagnet-spring structure, a movable iron core, an electromagnetic coil and a static iron core are arranged in a cavity of a welding gun shell, and attraction and separation between the movable iron core and the static iron core are realized through current change of the electromagnetic coil, so that the lifting motion of the main shaft body of the welding gun is driven, and lifting and releasing operations of a welding nail are realized. Because make the electro-magnet produce the actuation in-process, solenoid will produce the heat, consequently, this type of welder after using for a certain time in succession, its surface can have the too high phenomenon of temperature rise to can arouse following problem: 1) the risk of scalding the operator is easily caused; 2) the electromagnetic coil is easy to deform or burn, so that a main shaft body of the welding gun is clamped and cannot move, and the welding gun is damaged; 3) the resistance of the electromagnetic coil is increased due to overhigh temperature rise, the current of the electromagnetic coil is reduced, the lifting force of the welding gun is greatly reduced, and the welding nail cannot be lifted, so that the welding nail is particularly obvious when a large-diameter or overlong welding nail is welded; 4) when the welding nail is downward, the suction force between the movable iron core and the static iron core is too large, so that when the welding gun returns, the safety risk that molten iron splashes when the welding nail is downward can be avoided only by using the hydraulic buffer to buffer the main shaft.
In order to overcome the above-mentioned drawbacks of electromagnetic welding guns, there is an arc stud welding gun in the prior art that uses a dc motor to drive a main shaft to move up and down, wherein a driving mechanism includes a motor and a driving circuit, and usually further includes a voltage regulating circuit, and the voltage regulating circuit is connected to the driving circuit. Although the stud welding gun driven by the direct current motor can effectively avoid the defects of short service life, low welding quality and low efficiency of the existing electromagnetic driving mechanism, the voltage signal of the voltage regulating circuit can be influenced by the length of the power line of the welding gun, and the problem of obvious voltage drop can be caused by the overlong power line of the welding gun, so that the control signal is weak, and sensitive control cannot be realized.
SUMMERY OF THE UTILITY MODEL
In view of the above problems in the prior art, an object of the present invention is to provide a control circuit for a dc motor-driven welding gun, which is not affected by the length of a power line of the welding gun and is suitable for a wide range of operating voltages.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a control circuit of a direct current motor-driven welding gun comprises a main circuit, a main circuit driving circuit and a current regulating circuit, wherein the main circuit is a loop formed by serially connecting a power supply and a welding gun control line, a switch tube Q1 and a sampling resistor R are sequentially connected in series on the circuit between the output end of the welding gun control line and the negative electrode of the power supply, the main circuit driving circuit comprises resistors R1 and R2 and a switch tube Q2, and the current regulating circuit comprises a current sampling circuit a, a comparator U1, a large current circuit, a small current circuit and a delay circuit; wherein: the current sampling circuit a is connected with two ends of the sampling resistor R in parallel, the current sampling circuit a is electrically connected with a V + pin of the comparator U1, the resistor R1 and a collector of the switch tube Q2 are connected with a base electrode of the switch tube Q1 in parallel, the resistor R2 and a base electrode of the switch tube Q2 are connected with a Vout pin of the comparator U1 in parallel, and an emitter electrode of the switch tube Q2 is connected with a negative electrode; the high-current circuit comprises resistors R3 and R4 and a switching tube Q3, the low-current circuit comprises resistors R5 and R6 and a switching tube Q4, one end of a resistor R3 is electrically connected with a welding signal input end, the other end of the resistor R3 is electrically connected with a base electrode of a switching tube Q3, one end of a resistor R4 is electrically connected with a V-pin of a comparator U1, the other end of the resistor R5 is electrically connected with a collector electrode of a switching tube Q3, one end of a resistor R6 is electrically connected with a V-pin of a comparator U1, the other end of the resistor R5 is electrically connected with a base electrode of a switching tube Q4, one end of the resistor R6 is electrically connected with a V-pin of the comparator U1, the other end of the resistor R5 is electrically connected with a collector electrode of the switching tube Q4, and emitting electrodes of the switching tubes Q3 and Q4 are connected with negative electrodes; one end of the delay circuit is electrically connected to a circuit between the resistor R3 and the base electrode of the switch tube Q3, and the other end of the delay circuit is electrically connected to a circuit between the resistor R5 and the base electrode of the switch tube Q4; and the resistance of the resistor R4 is greater than the resistance of the resistor R6.
According to a preferable scheme, the power supply further comprises a stabilized voltage power supply, wherein the stabilized voltage power supply is connected with a power supply source in series and is electrically connected with a main circuit driving circuit and a power supply input end of the comparator U1.
Further preferably, the input voltage of the stabilized voltage power supply is 20-190V, and the output voltage of the stabilized voltage power supply is 10-40V.
According to a preferable scheme, a one-way diode, a capacitor filter circuit and a freewheeling diode are arranged on the main circuit.
In one embodiment, the current sampling circuit a is composed of resistors R7 and R8 and a filter capacitor C1, wherein the resistors R7 and R8 are connected in series and then connected in parallel with two ends of the sampling resistor R, the filter capacitor C1 is connected in parallel with two ends of the resistor R8, and the input end of the filter capacitor C1 is electrically connected to the V + pin of the comparator U1.
In a preferable scheme, a luminous indicating circuit is connected in parallel with two ends of the resistor R1.
In a preferable scheme, a light-emitting indicating circuit is connected in series with a circuit between the resistor R5 and the base electrode of the switching tube Q4.
In one embodiment, the delay circuit is any one of a capacitor charging delay circuit, a single-chip microcomputer delay circuit or a digital circuit delay circuit.
In one embodiment, the delay circuit is a capacitor charging delay circuit, which includes charging capacitors CA and CB and a switch Q5, wherein: the input ends of the charging capacitors CA and CB and the base electrode of the switch tube Q5 are connected in parallel with the output end of the resistor R5, the output ends of the charging capacitors CA and CB and the emitter electrode of the switch tube Q5 are connected with the negative electrode, and the collector electrode of the switch tube Q5 is electrically connected to a circuit between the resistor R3 and the base electrode of the switch tube Q3.
In a preferred scheme, a light-emitting indicating circuit is connected in series with a circuit between the input ends of the charging capacitors CA and CB and the base electrode of the switching tube Q5.
The short-circuit protection circuit comprises a current sampling circuit b, a photoelectric switch U2, resistors R9 and R10 and a unidirectional silicon controlled rectifier Q, wherein the current sampling circuit b comprises resistors R11, R12 and a filter capacitor C2, a resistor R11 and a resistor R12 are connected in series and then connected with two ends of a sampling resistor R in parallel, the filter capacitor C2 is connected with two ends of a resistor R12 in parallel, the input end of the filter capacitor C2 is electrically connected with a V + pin of the photoelectric switch U2, the resistors R9 and R10 are sequentially connected with the output end of the photoelectric switch U2 in series, the control electrode of the unidirectional silicon controlled rectifier Q is electrically connected with a circuit between the resistors R9 and R10, the anode of the unidirectional silicon controlled rectifier Q is electrically connected with the base electrode of a switch tube Q1, and the cathode of the unidirectional silicon controlled rectifier Q and the other end of the resistor R10 are connected with the negative electrode.
Compared with the prior art, the utility model has the following beneficial technical effects:
by adopting the control circuit provided by the utility model, the welding gun can be driven to work under a direct-current power supply, the control circuit can be suitable for a wide-range working voltage of 20-190V, particularly, the large-current lifting and small-current maintaining can be realized, and the problem of heating of the welding gun during working can be effectively avoided; the control circuit of the utility model adopts current regulation control to replace the existing voltage regulation control, thus effectively solving the problem of voltage drop caused by overlong welding gun line and avoiding the defects of weak signal and insensitive control; in addition, the control circuit has a simple and ingenious structure, can be realized by only common simple components, is low in cost and easy to realize, and ensures reliable working performance; therefore, compared with the prior art, the utility model has significant progress and practical value.
Drawings
Fig. 1 is a schematic structural diagram of a control circuit of a dc motor-driven welding gun according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a short-circuit protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a control circuit according to an embodiment of the present invention for implementing on/off of a main circuit;
fig. 4 is a schematic circuit diagram of a control circuit according to an embodiment of the present invention when a large current is boosted;
fig. 5 is a schematic circuit diagram of a control circuit according to an embodiment of the present invention when the control circuit implements a low current sustain operation;
fig. 6 is a schematic circuit diagram of a short-circuit protection circuit according to an embodiment of the present invention.
The numbers in the figures are as follows: 1. a main circuit; 1-1, a power supply; 1-11, and a power supply anode; 1-12, a power supply cathode; 1-2, controlling a welding gun; 1-21, input end of welding gun control line; 1-22, and a welding gun control line output end; 1-3, a unidirectional diode; 1-4, a capacitive filter circuit; 1-5, a freewheeling diode; 2. a main circuit drive circuit; 2-1, a light emitting indicating circuit; 3. a current regulating circuit; 3-1, a current sampling circuit a; 3-2, comparator U1; 3-3, a high current circuit; 3-4, a low current circuit; 3-41, a light-emitting indicating circuit; 3-5, a delay circuit; 3-51, a light emitting indicating circuit; 4. a regulated power supply; 5. a short-circuit protection circuit; 5-1, a current sampling circuit b; 5-2 and an optoelectronic switch U2.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and examples.
Examples
Please refer to fig. 1:
the control circuit of the direct current motor-driven welding gun provided by the embodiment comprises a main circuit 1, a main circuit driving circuit 2, a current regulating circuit 3 and a stabilized voltage power supply 4;
the main circuit 1 is a loop formed by connecting a power supply 1-1 and a welding gun control line 1-2 in series, a one-way diode 1-3, a capacitance filter circuit 1-4 and a fly-wheel diode 1-5 are arranged on the main circuit 1, and the one-way diode 1-3 is connected in series on a circuit between the anode 1-11 of the power supply and the input end 1-21 of the welding gun control line; the capacitor filter circuit 1-4 and the freewheeling diode 1-5 are connected in parallel with the circuit between the anode 1-11 of the power supply and the cathode 1-12 of the power supply; a switching tube Q1 and a sampling resistor R are sequentially connected in series on a circuit between the output ends 1-22 of the welding gun control line and the cathodes 1-12 of the power supply; the switching tube Q1 can be selected from a semiconductor capable of switching current, such as an IGBT (insulated gate bipolar transistor), a field effect transistor, a common triode, a silicon carbide tube, etc., and the present embodiment takes a common triode as an example, but is not limited to this example;
the main circuit driving circuit 2 comprises resistors R1 and R2 and a switching tube Q2, the switching tube Q2 can be selected from an IGBT (insulated gate bipolar transistor), a field effect transistor, a common triode, a silicon carbide transistor and other semiconductors capable of switching current, and the present embodiment also takes the common triode as an example, but is not limited to the example;
the current regulating circuit 3 comprises a current sampling circuit a 3-1, a comparator U13-2, a large current circuit 3-3, a small current circuit 3-4 and a delay circuit 3-5; wherein:
the current sampling circuit a 3-1 is composed of resistors R7 and R8 and a filter capacitor C1, wherein the resistors R7 and R8 are connected in series and then connected in parallel with two ends of a sampling resistor R, the filter capacitor C1 is connected in parallel with two ends of a resistor R8, the input end of the filter capacitor C1 is electrically connected with a V + pin (namely: a pin 5 of U1 in the figure) of a comparator U13-2, the collector of the resistor R1 and a collector of a switch tube Q2 are connected in parallel with the base of the switch tube Q1, the bases of the resistor R2 and the switch tube Q2 are connected in parallel with a Vout pin (namely: a pin 7 of U1 in the figure) of the comparator U13-2, and the emitter of the switch tube Q2 is connected with the negative electrode;
the large current circuit 3-3 comprises resistors R3 and R4 and a switching tube Q3, the small current circuit 3-4 comprises resistors R5 and R6 and a switching tube Q4, one end of the resistor R3 is electrically connected with the welding signal input end, the other end is electrically connected with the base electrode of the switch tube Q3, one end of the resistor R4 is electrically connected with the V-pin of the comparator U13-2 (i.e. pin 6 of U1 in the figure), the other end is electrically connected with the collector of the switch tube Q3, one end of the resistor R5 is electrically connected with the welding signal input end, the other end is electrically connected with the base electrode of the switch tube Q4, one end of the resistor R6 is electrically connected with a V-pin (namely a pin 6 of U1 in the figure) of the comparator U13-2, the other end of the resistor R6 is electrically connected with a collector of a switch tube Q4, emitters of the switch tubes Q3 and Q4 are both connected with negative poles, and the resistance value of the resistor R4 is greater than that of the resistor R6;
one end of the delay circuit 3-5 is electrically connected with the circuit between the resistor R3 and the base electrode of the switch tube Q3, and the other end is electrically connected with the circuit between the resistor R5 and the base electrode of the switch tube Q4; the delay circuit 3-5 may adopt any one of a capacitor charging delay circuit, a single-chip microcomputer delay circuit or a digital circuit delay circuit, the embodiment takes a capacitor charging delay circuit as an example, the delay circuit 3-5 includes charging capacitors CA and CB and a switch tube Q5, wherein: the input ends of the charging capacitors CA and CB and the base electrode of the switching tube Q5 are connected in parallel with the output end of the resistor R5, the output ends of the charging capacitors CA and CB and the emitter electrode of the switching tube Q5 are connected with the negative electrode, and the collector electrode of the switching tube Q5 is electrically connected to a circuit between the resistor R3 and the base electrode of the switching tube Q3;
the stabilized voltage supply 4 is connected with the power supply 1-1 in series and is electrically connected with the main circuit driving circuit 2 and the power supply input end of the comparator U1; the input voltage of the stabilized voltage power supply is 20-190V, the output voltage of the stabilized voltage power supply is 10-40V, and the stabilized voltage power supply can be obtained by adopting a switching power supply or a transformer from mains supply.
In addition, please refer to fig. 2:
preferably, the control circuit of the dc motor driven welding gun according to the embodiment further includes a short-circuit protection circuit 5, the short-circuit protection circuit 5 includes a current sampling circuit b 5-1, a photo switch U25-2, resistors R9 and R10, and a unidirectional silicon controlled rectifier Q, the current sampling circuit b 5-1 is composed of resistors R11 and R12, and a filter capacitor C2, wherein the resistor R11 is connected in series with the resistor R12 and then connected in parallel with two ends of the sampling resistor R, the filter capacitor C2 is connected in parallel with two ends of the resistor R12, an input end of the filter capacitor C2 is electrically connected with a V + pin of the photo switch U2 (i.e., pin 1 of U2 in the figure), the resistors R9 and R10 are sequentially connected in series with an output end of the photo switch U2 (i.e., pin 4 of U2 in the figure), a control electrode of the unidirectional silicon controlled rectifier Q (i.e., stage g. in the figure) is electrically connected with a circuit between the resistor R9 and the resistor R10, the anode (i.e. A grade in the figure) of the unidirectional silicon controlled rectifier Q is electrically connected with the base electrode of the switching tube Q1, and the cathode (i.e. K grade in the figure) of the unidirectional silicon controlled rectifier Q and the other end of the resistor R10 are both connected with the negative electrode; the photoelectric switch U2 can be an optical coupler or a triode.
As a preferable scheme:
the two ends of the resistor R1 are connected in parallel with a light-emitting indicating circuit 2-1, and the light-emitting indicating circuit 2-1 is formed by connecting a resistor R13 and a light-emitting diode D1 in series and is used for displaying the on-off state of a switch tube Q1;
a circuit between the resistor R5 and the base electrode of the switch tube Q4 is connected in series with a luminous indicating circuit 3-41, and the luminous indicating circuit 3-41 is formed by connecting a resistor R14 and a light-emitting diode D2 in series and is used for displaying the on-off state of the switch tube Q4;
a circuit between the input ends of the charging capacitors CA and CB and the base electrode of the switch tube Q5 is connected in series with a luminous indicating circuit 3-51, and the luminous indicating circuit 3-51 is formed by connecting a resistor R15 and a light emitting diode D3 in series and is used for displaying the on-off state of the switch tube Q5.
Fig. 3 is a schematic circuit diagram of a control circuit according to an embodiment of the present invention for implementing on/off of a main circuit, which is shown in fig. 3:
when the voltage of the V + pin (i.e., pin 5 of U1 in the figure) of U1 is lower than the voltage of the V-pin (i.e., pin 6 of U1 in the figure) of U1, the output of the Vout pin (i.e., pin 7 of U1 in the figure) of U1 is low, so that the resistor R2 cannot trigger Q2 to be turned on, and the resistor R1 triggers Q1 to be turned on;
when the voltage of the V + pin (i.e., pin 5 of U1 in the figure) of U1 is higher than the voltage of the V-pin (i.e., pin 6 of U1 in the figure) of U1, the output of the Vout pin (i.e., pin 7 of U1 in the figure) of U1 is high level, so that the resistor R2 triggers Q2 to be turned on, thereby enabling Q1 to be turned off;
the on and off of the Q1 determines the presence or absence of current in the main circuit and implements a chopper circuit in the main circuit, thereby enabling the main circuit to form accurate current control consistent with dc motor drive, namely: at the beginning of welding, the high current realizes quick lifting, and after the lifting is realized, the low current can be immediately changed into the low current for maintaining.
Fig. 4 is a schematic circuit diagram of a control circuit according to an embodiment of the present invention when a large current is boosted, as shown in fig. 4:
when a welding start signal comes, Q3 is switched on by R3, a resistor R4 works, the resistance value of the resistor R4 is large, so that the voltage of the 6 pin of U1 is high, the main circuit has large current, the voltage of the two ends of a sampling resistor R is high, the voltage of the two ends of the sampling resistor R is further divided by a current sampling circuit a to the 5 pin of U1, once the voltage of the 5 pin of U1 is higher than the voltage of the 6 pin of U1, Q1 is switched off, when the voltage of the 5 pin of U1 is lower than the voltage of the 6 pin of U1, Q1 is repeatedly switched on, and therefore a chopper circuit of the main circuit under the large current is realized until the time delay circuit 3-5 starts to work and is converted into the small current work; the required boost current can be obtained by adjusting the resistance value of the resistor R4.
Fig. 5 is a schematic circuit diagram of a control circuit according to an embodiment of the present invention when the control circuit implements a low current sustain operation, and it can be seen from fig. 5 that:
when the Q5 in the delay circuit is turned on, the Q3 is turned off, so that the large current in the main circuit disappears; at this time, the resistor R5 turns on the Q4, the resistor R6 works, and since the resistance value of the resistor R6 is small, the voltage of the 6 pin of the U1 is low, and the main circuit has a small current (the required small current can be obtained by adjusting the resistance value of the resistor R6); when the voltage of the pin 5 of the U1 is higher than the voltage of the pin 6 of the U1, the Q1 is turned off, and when the voltage of the pin 5 of the U1 is lower than the voltage of the pin 6 of the U1, the Q1 is turned on repeatedly, so that a chopper circuit of the main circuit under low current is realized until the welding control signal is turned off.
Fig. 6 is a schematic circuit diagram of a short-circuit protection circuit according to an embodiment of the present invention, and it can be seen from fig. 6 that:
when a welding gun control line is in short circuit, the voltage at two ends of a sampling resistor R rises rapidly due to no load motor in a main circuit, so that a current sampling circuit b 5-1 triggers a photoelectric switch U25-2 to be conducted, the photoelectric switch U25-2 triggers a one-way thyristor Q to be conducted through a resistor R9, the Q1 is triggered without current to be turned off, the main circuit is turned off, the risk of burning out of the main circuit caused by short circuit of a welding gun is avoided, and the safety of operators and welding equipment is ensured.
From the above, it can be seen that: by adopting the control circuit provided by the utility model, the welding gun can be driven to work under a direct-current power supply, the applicable working voltage range is wide (the control circuit can be suitable for the wide-range working voltage of 20-190V), the large-current lifting and the small-current maintaining can be realized, and the heating problem of the welding gun during working can be effectively avoided; the control circuit of the utility model adopts current regulation control to replace the existing voltage regulation control, thus effectively solving the problem of voltage drop caused by overlong welding gun line and avoiding the defects of weak signal and insensitive control; in addition, the control circuit has a simple and ingenious structure, can be realized by only common simple components, is low in cost and easy to realize, and ensures reliable working performance; therefore, compared with the prior art, the utility model has significant progress and practical value.
It is finally necessary to point out here: the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The utility model provides a control circuit of direct current motor drive formula welder which characterized in that: the welding gun control circuit comprises a main circuit, a main circuit driving circuit and a current regulating circuit, wherein the main circuit is a loop formed by serially connecting a power supply and a welding gun control line, a switch tube Q1 and a sampling resistor R are sequentially connected in series on a circuit between the output end of the welding gun control line and the negative electrode of the power supply, the main circuit driving circuit comprises resistors R1 and R2 and a switch tube Q2, and the current regulating circuit comprises a current sampling circuit a, a comparator U1, a large current circuit, a small current circuit and a time delay circuit; wherein: the current sampling circuit a is connected with two ends of the sampling resistor R in parallel, the current sampling circuit a is electrically connected with a V + pin of the comparator U1, the resistor R1 and a collector of the switch tube Q2 are connected with a base electrode of the switch tube Q1 in parallel, the resistor R2 and a base electrode of the switch tube Q2 are connected with a Vout pin of the comparator U1 in parallel, and an emitter electrode of the switch tube Q2 is connected with a negative electrode; the high-current circuit comprises resistors R3 and R4 and a switching tube Q3, the low-current circuit comprises resistors R5 and R6 and a switching tube Q4, one end of a resistor R3 is electrically connected with a welding signal input end, the other end of the resistor R3 is electrically connected with a base electrode of a switching tube Q3, one end of a resistor R4 is electrically connected with a V-pin of a comparator U1, the other end of the resistor R5 is electrically connected with a collector electrode of a switching tube Q3, one end of a resistor R6 is electrically connected with a V-pin of a comparator U1, the other end of the resistor R5 is electrically connected with a base electrode of a switching tube Q4, one end of the resistor R6 is electrically connected with a V-pin of the comparator U1, the other end of the resistor R5 is electrically connected with a collector electrode of the switching tube Q4, and emitting electrodes of the switching tubes Q3 and Q4 are connected with negative electrodes; one end of the delay circuit is electrically connected to a circuit between the resistor R3 and the base electrode of the switch tube Q3, and the other end of the delay circuit is electrically connected to a circuit between the resistor R5 and the base electrode of the switch tube Q4; and the resistance of the resistor R4 is greater than the resistance of the resistor R6.
2. The control circuit of the direct current motor-driven welding gun according to claim 1, characterized in that: the power supply further comprises a stabilized voltage power supply which is connected with a power supply source in series and is electrically connected with the main circuit driving circuit and the power supply input end of the comparator U1.
3. The control circuit of the direct current motor-driven welding gun according to claim 2, characterized in that: the input voltage of the stabilized voltage power supply is 20-190V, and the output voltage of the stabilized voltage power supply is 10-40V.
4. The control circuit of the direct current motor-driven welding gun according to claim 1, characterized in that: the main circuit is provided with a one-way diode, a capacitance filter circuit and a freewheeling diode.
5. The control circuit of the direct current motor-driven welding gun according to claim 1, characterized in that: the current sampling circuit a is composed of resistors R7 and R8 and a filter capacitor C1, wherein the resistor R7 and the resistor R8 are connected in series and then connected in parallel with two ends of a sampling resistor R, the filter capacitor C1 is connected in parallel with two ends of a resistor R8, and the input end of the filter capacitor C1 is electrically connected with a V + pin of a comparator U1.
6. The control circuit of the direct current motor-driven welding gun according to claim 1, characterized in that: a light-emitting indicating circuit is connected in parallel at two ends of the resistor R1; a light-emitting indicating circuit is connected in series with a circuit between the resistor R5 and the base of the switching tube Q4.
7. The control circuit of the direct current motor-driven welding gun according to claim 1, characterized in that: the delay circuit adopts any one of a capacitor charging delay circuit, a singlechip delay circuit or a digital circuit delay circuit.
8. The control circuit of the direct current motor-driven welding gun according to claim 1, characterized in that: delay circuit is electric capacity charging delay circuit, including charging capacitor CA and CB and switch tube Q5, wherein: the input ends of the charging capacitors CA and CB and the base electrode of the switch tube Q5 are connected in parallel with the output end of the resistor R5, the output ends of the charging capacitors CA and CB and the emitter electrode of the switch tube Q5 are connected with the negative electrode, and the collector electrode of the switch tube Q5 is electrically connected to a circuit between the resistor R3 and the base electrode of the switch tube Q3.
9. The control circuit of the direct current motor-driven welding gun according to claim 8, characterized in that: and a light-emitting indicating circuit is connected in series with a circuit between the input ends of the charging capacitors CA and CB and the base electrode of the switching tube Q5.
10. The control circuit of the direct current motor-driven welding gun according to any one of claims 1 to 9, characterized in that: the short-circuit protection circuit comprises a current sampling circuit b, a photoelectric switch U2, resistors R9 and R10 and a one-way thyristor Q, wherein the current sampling circuit b is composed of resistors R11 and R12 and a filter capacitor C2, a resistor R11 is connected with a resistor R12 in series and then connected with two ends of the sampling resistor R in parallel, the filter capacitor C2 is connected with two ends of a resistor R12 in parallel, the input end of the filter capacitor C2 is electrically connected with a V + pin of the photoelectric switch U2, the resistors R9 and R10 are sequentially connected with the output end of the photoelectric switch U2 in series, the control electrode of the one-way thyristor Q is electrically connected with the circuit between the resistors R9 and R10, the anode of the one-way thyristor Q is electrically connected with the base electrode of a switch tube Q1, and the cathode of the one-way thyristor Q and the other end of the resistor R10 are both connected with the cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121726137.7U CN215431967U (en) | 2021-07-27 | 2021-07-27 | Control circuit of direct current motor drive type welding gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121726137.7U CN215431967U (en) | 2021-07-27 | 2021-07-27 | Control circuit of direct current motor drive type welding gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215431967U true CN215431967U (en) | 2022-01-07 |
Family
ID=79684851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121726137.7U Active CN215431967U (en) | 2021-07-27 | 2021-07-27 | Control circuit of direct current motor drive type welding gun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215431967U (en) |
-
2021
- 2021-07-27 CN CN202121726137.7U patent/CN215431967U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101877532B (en) | Bipolar transistor auto-excitation type Buck convertor | |
| CN107659160B (en) | A kind of DC-DC constant-current circuit | |
| CN109322067A (en) | A kind of presser foot lifter magnet control system of multi-mode output driving | |
| CN101877535B (en) | Bipolar transistor self-exciting Buck-Boost converter | |
| CN102403895B (en) | Self-excitation Sepic converter based on MOSFET | |
| CN204031553U (en) | A kind of LED drive circuit and soft starting circuit thereof | |
| CN215431967U (en) | Control circuit of direct current motor drive type welding gun | |
| CN115673482A (en) | Control circuit of direct current motor drive type welding gun | |
| CN102226957A (en) | Circuit for realizing power-on voltage-multiplying accelerated suction and low power consumption maintenance of electromagnetic brake | |
| CN203775499U (en) | LED (light-emitting diode) pulse drive circuit | |
| CN101877533B (en) | Bipolar transistor self-exciting Zeta converter | |
| CN102794546B (en) | Control circuit for gas-shielded welding machine | |
| CN205249075U (en) | Resistant electromagnetic radiation's transistor self excited inverter | |
| CN201733223U (en) | Bipolar transistor self-excitation type Buck converter | |
| CN214256123U (en) | Surge current suppression circuit | |
| CN204303686U (en) | Wide region A.C. contactor control device | |
| CN103441672A (en) | Self-excitation BUCK circuit based on auxiliary winding sampling circuit | |
| CN108856979B (en) | Semi-automatic wire feeding welding machine of battery type self-protection | |
| CN102710132B (en) | Feedback type bipolar junction transistor (BJT) self-exciting Boost converter | |
| CN102522892B (en) | Auto-excitation-type Buck converter based on metal oxide semiconductor field effect transistor (MOSFET) | |
| CN218920401U (en) | Kitchen range plug valve driving circuit | |
| CN202726271U (en) | Motor drive circuit of wire feeder for control circuit of gas shielded welder | |
| CN214799330U (en) | Electronic contactless energy-saving motor power regulating circuit | |
| CN220671531U (en) | High-precision zero-crossing detection circuit | |
| CN219247685U (en) | Heavy load compensation and short-circuit protection circuit for switching power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |