CN109039103B - Welding waveform control method for transistor resistance welding power supply - Google Patents
Welding waveform control method for transistor resistance welding power supply Download PDFInfo
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Abstract
The invention discloses a welding waveform control method of a transistor resistance welding power supply, wherein the topological structure of the transistor resistance welding power supply comprises the following steps: the main control module sends out a waveform control signal; a transistor group receiving the waveform control signal; the welding energy pool is connected with the transistor group, and electric energy is stored in the welding energy pool; the transistor group transmits the electric energy from the welding energy pool to the micro-spot welding head, and the micro-spot welding head receives the electric energy and generates welding energy to heat and weld a workpiece to be welded. The transistor resistance welding power supply can receive a waveform control signal sent by a main control module through a transistor group, the transistor group transmits electric energy to a micro-spot welding head from a welding energy pool, and low-voltage high-current discharge electric energy with hundred microsecond response is generated at the milliohm-level impedance tip of the micro-spot welding head.
Description
Technical Field
The invention relates to a transistor resistance welding power supply and a welding waveform control method thereof.
Background
The working principle of the resistance welding power supply comprises a capacitance energy storage type, an inversion type, a transistor type and the like, wherein the transistor type resistance welding power supply is synchronously turned on and off by a plurality of NMOS transistors connected in parallel to achieve welding energy output, the NMOS transistors have the advantages of small on-state internal resistance, high response speed and the like, but great challenges are provided for discharge waveform control strategies and methods, and the control strategies and methods aiming at the capacitance energy storage type, the inversion type and the like resistance welding power supply are directly applied to the transistor type resistance welding power supply, so that the unique performance of the transistor type resistance welding power supply cannot be highlighted.
The single discharge of the resistance welding power source comprises three stages of discharge starting, discharge sustaining and discharge ending, typical values of the discharge sustaining stage are in a range of sub-milliseconds to dozens of milliseconds, the ideal requirement of the discharge is that the micro-spot welding head obtains expected discharge voltage at the moment of discharge starting, the discharge voltage of the micro-spot welding head is kept unchanged within the discharge sustaining time, and the micro-spot welding head has no discharge voltage at the moment of discharge ending. The conventional resistance welding power source adopts a waveform control method which comprises the following steps: and in the set welding duration time T, the main control module acquires the real-time voltage of the micro-spot welding head, the real-time voltage is used as a feedback signal, and the main control module controls the transistor group to realize the welding energy output of the set voltage. The above method has the following defects: when the discharge is started, the time required for the micro-spot welding head to reach the set welding voltage is millisecond grade; within the discharge duration, the welding voltage of the micro-spot welding head is greatly fluctuated, and the service life of the micro-spot welding head is seriously reduced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, the invention provides a transistor resistance welding power supply, which can receive a waveform control signal sent by a main control module through a transistor group, the transistor group transmits electric energy from a welding energy pool to a micro-spot welding head, and low-voltage high-current discharge energy is generated at a milliohm-level impedance tip of the micro-spot welding head.
The invention also provides a welding waveform control method of the transistor resistance welding power supply, and the welding waveform control method can realize accurate control of welding energy of the micro-spot welding head.
The topological structure of the transistor resistance welding power supply according to the embodiment of the first aspect of the invention comprises: the main control module sends out a waveform control signal; a transistor group receiving the waveform control signal; the welding energy pool is connected with the transistor group, and electric energy is stored in the welding energy pool; the micro spot welding head is connected with the transistor group, the transistor group transmits the electric energy from the welding energy pool to the micro spot welding head, and the micro spot welding head receives the electric energy and generates welding energy to heat and weld a workpiece to be welded.
According to the topological structure of the transistor resistance welding power supply, the device combining the main control module, the transistor group, the welding energy pool and the micro-spot welding head is adopted, the transistor group can receive a waveform control signal sent by the main control module, the transistor group transmits electric energy from the welding energy pool to the micro-spot welding head, low-voltage high-current discharge electric energy is generated at the milliohm-level impedance tip of the micro-spot welding head, the micro-spot welding head is electrified with large current, welding is achieved through electrothermal conversion, welding energy can be increased, welding effect is improved, welding voltage of the micro-spot welding head can be stabilized, and service life of the micro-spot welding head is prolonged.
According to one embodiment of the invention, the welding energy cell is a capacitor bank, and the micro-spot welding head has a milliohm-level impedance tip which converts low-voltage high-current electric energy into heat energy to weld a workpiece to be welded by a contact heating mode.
According to an embodiment of the present invention, the transistor resistance welding power supply incorporates: the voltage transformation rectifying module is connected with a power supply grid, can reduce the electric energy of the grid to required direct current voltage, and is interactive with the main control module; the charging circuit module is respectively connected with the main control module and the transformation rectifying module to continuously charge the capacitor bank to a set direct-current voltage; a rogowski coil that induces a change in discharge current from a discharge link and transmits an output signal when performing discharge; the device comprises a discharge voltage and current detection module, a control module and a power supply module, wherein the discharge voltage and current detection module receives and preprocesses a discharge voltage signal of the micro-spot welding head when performing discharge, receives an output signal of the Rogowski coil and preprocesses the output signal, interacts with the main control module, and can transmit the preprocessed signal to the main control module; the human-computer interaction module interacts with the main control module and can input parameters and instructions to the main control module and display the working state and parameters of the main control module.
According to one embodiment of the present invention, the transistor resistance welding power supply is externally connected with: one ends of the two flexible copper cables are respectively connected with copper connecting terminals of the anode and the cathode of the transistor resistance welding power supply; the device comprises a welding head clamp, wherein one ends of two electrode ends of the welding head clamp are respectively connected with the other ends of two flexible copper cables, the other ends of the two electrode ends of the welding head clamp are connected with a discharge voltage feedback cable to a discharge voltage current detection module, and the welding head clamp is provided with the micro spot welding head.
According to an embodiment of the present invention, the negative copper connection terminal in the transistor resistance welding power supply passes through the rogowski coil, and an induced voltage signal in accordance with a variation trend of a discharge current is induced by the rogowski coil from the discharge current flowing through the negative copper connection terminal, and is transmitted to the discharge voltage current detection module.
According to the welding waveform control method of the transistor resistance welding power supply in the embodiment of the second aspect of the invention, in a single discharge time, the main control module comprises the following links for controlling the discharge waveform: a discharge waveform control link I is used for increasing the time required by the micro-spot welding head to reach a set welding voltage to a hundred microsecond level, so that the discharge voltage can quickly climb; and in the discharge waveform control link III, the self-adaptive PID algorithm is started within the discharge duration time to accurately control the welding energy of the micro-spot welding head, so that the stable control of the discharge voltage or the discharge current can be realized.
According to an embodiment of the present invention, the method for controlling the welding waveform of the transistor resistance welding power supply further includes: and the discharge waveform control link II can realize the self-adaptive connection of the discharge waveform control link I and the discharge waveform control link III, realize the quick start of a self-adaptive PID algorithm in the discharge waveform control link III, and realize the quick setting when climbing to a target voltage.
According to an embodiment of the present invention, the discharge waveform control section I includes: a1, the main control module outputs a waveform control signal from T0 moment to control the transistor group to realize discharge energy output in a full power output mode, meanwhile, detection signals are continuously collected and preprocessed from the discharge voltage and current detection module, real-time discharge current and discharge voltage are extracted by the main control module, and the resistance value and the discharge voltage climbing rate of the micro-spot welding head are calculated; a2, the main control module performs matching operation on the resistance value and the climbing rate of the discharge voltage of the micro-spot welding head and a discharge waveform database, calculates a specific value of a proper target voltage Vmax, outputs full power until the discharge voltage of the micro-spot welding head reaches Vmax, and the duration of the link is (Ta-T0).
According to an embodiment of the present invention, the discharge waveform control section II includes: b1, the main control module stops waveform control signals from the moment Ta, and simultaneously continuously extracts real-time discharge current and discharge voltage from the discharge voltage and current detection module to calculate the discharge voltage and current reduction rate of the micro-spot welding head; b2, the main control module matches the discharge voltage and the current reduction rate of the micro-spot welding head with a discharge waveform database to calculate the proper no-power output duration (Tb-Ta).
According to an embodiment of the present invention, the discharge waveform control section III includes: and starting a self-adaptive PID control algorithm by the main control module to realize self-adaptive control of the discharge voltage of the micro-spot welding head, wherein the duration time of the self-adaptive PID control algorithm is (T1-Tb).
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a topology of a transistor resistance welding power supply according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a transistor resistance welding power supply according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a welding waveform control method of a transistor resistance welding power supply according to an embodiment of the invention.
Reference numerals:
a transistor resistance welding power supply 100;
a main control module 1; a transistor group 2; a welding energy pool 3; a micro spot welding head 4; a voltage transformation rectifying module 5; a charging circuit module 6; a Rogowski coil 7; a discharge voltage current detection module 8; a human-computer interaction module 9; a flexible copper cable 10; a weld head holder 11;
welding waveform control method 200.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The transistor resistance welding power supply 100 according to the embodiment of the present invention is described in detail below with reference to the drawings.
As shown in fig. 1 and 2, the topology of a transistor resistance welding power supply 100 according to an embodiment of the present invention includes a master control module 1, a transistor group 2, a welding energy cell 3, and a micro spot welding head 4.
Specifically, the main control module 1 sends out a waveform control signal, the transistor group 2 receives the waveform control signal, the welding energy pool 3 is connected with the transistor group 2, electric energy is stored in the welding energy pool 3, the micro-spot welding head 4 is connected with the transistor group 2, the transistor group 2 transmits the electric energy from the welding energy pool 3 to the micro-spot welding head 4, and the micro-spot welding head 4 receives the electric energy and generates welding energy to heat and weld a workpiece to be welded.
In other words, the topology structure of the transistor resistance welding power supply 100 according to the embodiment of the present invention mainly includes the main control module 1, the transistor group 2, the welding energy cell 3, and the micro-spot welding head 4, where the main control module 1 is connected to the transistor group 2, the main control module 1 sends out the waveform control signal, the transistor group 2 receives the waveform control signal, the welding energy cell 3 is connected to the transistor group 2, the micro-spot welding head 4 is connected to the transistor group 2, the welding energy cell 3 stores electric energy, the welding energy cell 3 continuously stores energy required for welding, the transistor group 2 can transmit the energy in the welding energy cell 3 to the micro-spot welding head 4, and the micro-spot welding head 4 receives the electric energy, and can generate welding energy at the tip of the micro-spot welding head 4, thereby achieving heating welding of a workpiece to be welded.
As shown in fig. 1, it should be noted that, after the transformer with a winding ratio of N1: N2 steps down the electric energy (AC) to several tens of volts, the required dc voltage is rectified by full bridge, and during welding, the transistor group 2(Q) can be controlled by the pulse width modulation signal (PWM signal) to transmit energy from the welding energy pool 3 to the micro-spot welding head 4, the micro-spot welding head 4 can be supplied with a large current, and welding is realized by electrothermal conversion, and the waveform characteristics of the PWM signal affects or even determines the welding energy and the final welding effect of the micro-spot welding head 4.
Therefore, according to the topological structure of the transistor resistance welding power supply 100 provided by the embodiment of the invention, the device combining the main control module 1, the transistor group 2, the welding energy pool 3 and the micro-spot welding head 4 is adopted, the transistor group 2 can receive the waveform control signal sent by the main control module 1, the transistor group 2 transmits electric energy from the welding energy pool 3 to the micro-spot welding head 4, low-voltage high-current discharge electric energy with hundred-microsecond response is generated at the milliohm-level impedance tip of the micro-spot welding head 4, welding is realized by passing large current through the micro-spot welding head 4 and by electrothermal conversion, the quick response characteristic of the transistor group is exerted to the maximum extent by quick climbing, setting and stable control of welding voltage, and the welding effect is improved.
As shown in fig. 1, according to an embodiment of the present invention, the welding energy pool 3 may be a capacitor bank, the capacitor bank may be a large-capacity capacitor bank (C), the capacitor bank stores electric energy, the micro-spot welding head 4 may have a milliohm impedance tip, the milliohm impedance tip performs electric-thermal conversion of low-voltage high-current electric energy from milliohm impedance thereof, and the welding energy pool directly generates heat to weld the workpiece to be welded in a contact heating manner.
As shown in fig. 2, optionally, the transistor resistance welding power supply 100 is provided with a transformer rectifier module 5, a charging circuit module 6, a rogowski coil 7, a discharge voltage and current detection module 8 and a human-computer interaction module 9.
Specifically, the transformation rectifying module 5 is connected with a power supply grid, the transformation rectifying module 5 can step down the electric energy of the grid to a required direct current voltage, the transformation rectifying module 5 interacts with the main control module 1, the charging circuit module 6 is respectively connected with the main control module 1 and the transformation rectifying module 5 to continuously charge the capacitor bank to a set direct current voltage, the rogowski coil 7 induces the change of discharge current from a discharge link and transmits an output signal when discharging is performed, the discharge voltage and current detection module 8 receives and preprocesses a discharge voltage signal of the micro-spot welding head 4 when discharging is performed, receives and preprocesses an output signal of the rogowski coil 7, the discharge voltage and current detection module 8 interacts with the main control module 1, the discharge voltage and current detection module 8 can transmit the preprocessed signal to the main control module 1, the human-computer interaction module 9 interacts with the main control module 1, the man-machine interaction module 9 can input parameters and instructions to the main control module 1 and display the working state and parameters of the main control module 1.
That is, the transformer rectifier module 5 may be connected to a power supply grid, the transformer rectifier module 5 may be a toroidal transformer having a winding ratio of N1: N2, the transformer rectifier module 5 may step down a grid power to several tens of volts and then perform full-bridge rectification to obtain a dc voltage required by the main control module 1, the charging circuit module 6, and the discharge voltage and current detection module 8, the charging circuit module 6 may be controlled by the main control module 1, the charging circuit module 6 may continuously charge the capacitor bank to a set dc voltage, the transistor bank 2 may be controlled by the main control module 1, during discharge, the capacitor bank transfers the power to the discharge link, the rogowski coil 7 may be used as a large current induction element, during discharge, a change of discharge current is induced from the discharge link and an induction signal thereof is transmitted to the discharge voltage and current detection module 8, during discharge, the discharge voltage and current detection module 8 may receive a discharge voltage signal of the micro head 4 and perform pre-processing such as filtering And receiving the output signal of the Rogowski coil 7, performing preprocessing such as integration and the like, transmitting the preprocessed signal to the main control module 1, wherein the human-computer interaction module 9 can comprise keys, an indicator light, a display screen and the like, inputting parameters and instructions to the main control module 1 without entering through the human-computer interaction module 9, and displaying the working state and related parameters of the main control module 1.
It should be noted that the main control module 1 may interact with each sub-module, and implement waveform control.
Further, two flexible copper cables 10 and a bonding head holder 11 are externally connected to the transistor resistance welding power supply 100.
Specifically, one end of each of two flexible copper cables 10 is connected with a copper connecting terminal of a positive electrode and a copper connecting terminal of a negative electrode of a transistor resistance welding power supply, one end of each of two electrode ends of a welding head clamp 11 is connected with the other end of each of the two flexible copper cables 10, the other end of each of the two electrode ends of the welding head clamp 11 is connected with a discharge voltage feedback cable to a discharge voltage and current detection module 8, real-time detection of discharge voltage is achieved, a micro spot welding head 4 is installed on the welding head clamp 11, and the tip of the micro spot welding head 4 can close the whole welding loop.
In some embodiments of the present invention, the negative copper connection terminal in the transistor resistance welding power supply passes through the rogowski coil 7, a voltage signal is induced from the change of the discharge current by the rogowski coil 7, that is, an induced voltage signal in accordance with the change trend of the discharge current is induced from the discharge current flowing through the negative copper connection terminal by the rogowski coil 7, and the voltage signal is transmitted to the discharge voltage and current detection module 8, so as to realize the real-time detection of the discharge current.
As shown in fig. 3, according to the welding waveform control method 200 of the transistor resistance welding power supply of the embodiment of the present invention, in a single discharge time, the main control module 1 includes a discharge waveform control link i and a discharge waveform control link iii for discharge waveform control.
Specifically, in the discharge waveform control link i, the time required for the micro-spot welding head 4 to reach the set welding voltage is increased to hundred microseconds, so that the rapid climbing of the discharge voltage can be realized, and in the discharge waveform control link iii, the adaptive PID algorithm is started within the discharge duration time to accurately control the welding energy of the micro-spot welding head 4, so that the stable control of the discharge voltage or the discharge current can be realized.
According to an embodiment of the invention, the main control module 1 further comprises a discharge waveform control link II, the discharge waveform control link II can realize the self-adaptive connection of the discharge waveform control link I and the discharge waveform control link III, realize the quick start of a self-adaptive PID algorithm in the discharge waveform control link III, and realize the quick setting when climbing to a target voltage.
That is to say, in a single welding process, the main control module 1 can carry out discharge waveform control in three links, and the defects of conventional waveform control can be overcome.
Further, the discharge waveform control section I includes:
a1, the main control module 1 outputs waveform control signals from T0 time, the transistor group 2 is controlled to realize discharge energy output in a full power output mode, meanwhile, detection signals are continuously collected and preprocessed from the discharge voltage and current detection module 8, real-time discharge current and discharge voltage are extracted from the main control module 1, and the resistance value and the discharge voltage climbing rate of the micro-spot welding head 4 are calculated.
A2, the main control module 1 matches the resistance value and the climbing rate of the discharge voltage of the micro-spot welding head 4 with the discharge waveform database, calculates the specific value of the proper target voltage Vmax, outputs full power until the discharge voltage of the micro-spot welding head 4 reaches Vmax, and the duration of the link is (Ta-T0).
That is, setting the discharge parameters of single discharge, including discharge voltage Vset, discharge duration (T1-T0), etc., in the discharge waveform control link I, the instantaneous voltage on the micro-spot welding head 4 is increased to exceed Vset and finally reaches the target voltage Vmax, the main control module 1 outputs the waveform control signal from T0 moment, the transistor group 2 is controlled to realize discharge energy output in a full power output mode, meanwhile, the detection signal is continuously collected and preprocessed from the discharge voltage and current detection module 8, the real-time discharge current and discharge voltage are extracted by the main control module, the resistance value of the currently used micro-spot welding head 4 and the discharge voltage climbing rate of the micro-spot welding head 4 are calculated, the main control module 1 matches the resistance value of the micro-spot welding head 4 and the discharge voltage climbing rate of the micro-spot welding head 4 with the discharge waveform database for operation, and calculates the specific value of the proper target voltage Vmax, full power is output until the discharge voltage of the micro-spot welding head 4 reaches Vmax, and the duration of the link is (Ta-T0).
In some embodiments of the present invention, the discharge waveform control section II includes:
b1, the main control module 1 stops the waveform control signal from Ta, and simultaneously continuously extracts the real-time discharge current and discharge voltage from the discharge voltage and current detection module 8, and calculates the discharge voltage and current reduction rate of the micro-spot welding head 4.
B2, the main control module 1 matches the discharge voltage and the current drop rate of the micro-spot welding head 4 with the discharge waveform database to calculate the proper no-power output duration (Tb-Ta).
According to one embodiment of the invention, the discharge waveform control link III comprises that the main control module 1 starts an adaptive PID control algorithm to realize adaptive control of the discharge voltage of the micro-spot welding head 4, and the duration of the adaptive control is (T1-Tb).
In summary, according to the welding waveform control method 200 of the transistor resistance welding power supply of the embodiment of the present invention, in a single discharge duration, a waveform control method is adopted, the transistor resistance welding power supply realizes rapid climbing of a discharge voltage, rapid setting when climbing to a target voltage and smooth control of the discharge voltage thereafter, the discharge voltage and the discharge current are collected in real time from a discharge link, the variation characteristics are analyzed, the discharge waveform control is divided into three links, the waveform control parameters of the transistor group 2 of each link are adaptively calculated according to the above information, and accurate control of welding energy of the micro-spot welding head 4 is realized, the welding waveform control method 200 of the embodiment of the present invention can not only divide the waveform into three links, perform accurate waveform control for each link, but also can increase the time required by the micro-spot welding head 4 to reach a set welding voltage to hundreds of microseconds, and a non-power output link is arranged at the moment of starting discharging, so that the rapid starting of the adaptive PID algorithm is ensured, and the welding energy of the micro-spot welding head 4 can be accurately controlled by starting the adaptive PID algorithm within the discharging duration.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. A welding waveform control method of a transistor resistance welding power supply is characterized in that the topological structure of the transistor resistance welding power supply comprises the following steps:
the main control module sends out a waveform control signal;
a transistor group receiving the waveform control signal;
the welding energy pool is connected with the transistor group, and electric energy is stored in the welding energy pool;
a micro spot welding head connected to the transistor group, the transistor group transmitting the electric energy from the welding energy pool to the micro spot welding head, the micro spot welding head receiving the electric energy and generating welding energy to heat and weld a workpiece to be welded;
in the welding waveform control method, within a single discharge time, the main control module performs discharge waveform control by the following links:
a discharge waveform control link I is provided,
the time required by the micro-spot welding head to reach the set welding voltage is increased to hundred microseconds, so that the rapid climbing of the discharge voltage can be realized;
a discharge waveform control link III is connected with the discharge circuit,
the welding energy of the micro-spot welding head is accurately controlled by starting the self-adaptive PID algorithm within the discharge duration time, and the stable control of discharge voltage or discharge current can be realized;
a discharge waveform control link II is provided,
the discharge waveform control link II can realize the self-adaptive connection of the discharge waveform control link I and the discharge waveform control link III, realize the quick start of the self-adaptive PID algorithm in the discharge waveform control link III, and realize the quick setting when climbing to the target voltage.
2. The welding waveform control method of the transistor resistance welding power supply according to claim 1, wherein the discharge waveform control section I comprises:
a1, the main control module outputs a waveform control signal from T0 moment to control the transistor group to realize discharge energy output in a full power output mode, meanwhile, detection signals are continuously collected and preprocessed from the discharge voltage and current detection module, real-time discharge current and discharge voltage are extracted by the main control module, and the resistance value and the discharge voltage climbing rate of the micro-spot welding head are calculated;
a2, the main control module performs matching operation on the resistance value and the climbing rate of the discharge voltage of the micro-spot welding head and a discharge waveform database, calculates a specific value of a proper target voltage Vmax, outputs full power until the discharge voltage of the micro-spot welding head reaches Vmax, and the duration of the link is Ta-T0.
3. The welding waveform control method of the transistor resistance welding power supply according to claim 2, wherein the discharge waveform control section II comprises:
b1, the main control module stops waveform control signals from the moment Ta, and simultaneously continuously extracts real-time discharge current and discharge voltage from the discharge voltage and current detection module to calculate the discharge voltage and current reduction rate of the micro-spot welding head;
b2, the main control module carries out matching operation on the discharge voltage and the current reduction rate of the micro-spot welding head and a discharge waveform database, and calculates the proper no-power output duration Tb-Ta.
4. The welding waveform control method of the transistor resistance welding power supply according to claim 3, wherein the discharge waveform control section III comprises:
and starting a self-adaptive PID control algorithm by the main control module to realize self-adaptive control of the discharge voltage of the micro-spot welding head, wherein the duration time is T1-Tb.
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