CN115870590A - Output control circuit of inverter welding machine - Google Patents
Output control circuit of inverter welding machine Download PDFInfo
- Publication number
- CN115870590A CN115870590A CN202211720170.8A CN202211720170A CN115870590A CN 115870590 A CN115870590 A CN 115870590A CN 202211720170 A CN202211720170 A CN 202211720170A CN 115870590 A CN115870590 A CN 115870590A
- Authority
- CN
- China
- Prior art keywords
- voltage
- resistor
- output
- circuit
- 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.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Inverter Devices (AREA)
Abstract
The invention discloses an output control circuit of an inverter welding machine, wherein a voltage control mode module and a current control mode module of the inverter welding machine adopt the same clock, an error amplifier amplifies an error generated by a reference voltage and a welding power supply output feedback signal and outputs an error amplified voltage to the voltage control mode module, and the voltage control mode module compares the error amplified voltage with a sawtooth wave to form a voltage control voltage output pulse; the current calculation module calculates to obtain a calculated voltage according to the reference voltage and the turn ratio of the transformer, and the current control mode module compares the calculated voltage with a feedback signal of the current output by the driving inverter circuit to form a current control voltage output pulse; the AND circuit outputs a PWM signal to a control end of a switching tube of the driving inverter circuit by performing AND operation on the voltage control voltage output pulse and the current control voltage output pulse. The invention has low noise sensitivity in the power stage and can quickly respond to the current flowing through the switching tube of the driving inverter circuit when the load is changed suddenly and even is short-circuited.
Description
Technical Field
The invention belongs to the circuit technology, and particularly relates to an output control circuit of an inverter welding machine.
Background
At present, the power output of an inverter welding machine has two different control modes, namely a current control mode and a voltage control mode.
The principle of the voltage control mode is shown in fig. 1, the output voltage Vout of the inverter welder power supply is a constant voltage output, and the output voltage Vout of the inverter welder power supply is taken as a feedback voltage and is sent to an input end of an error amplifier.
In the voltage control mode, the error amplification voltage Ve is compared with the sawtooth wave Vr to form output pulses, the switching-on and switching-off of the switching tube are controlled, and the output voltage Vout of the inverter welding machine power supply is adjusted.
The main advantages of the voltage control mode are: the control is simple, a single feedback loop is generally adopted, and the design is easy; and secondly, the sensitivity to noise is low, and the influence of other parameters of the circuit is avoided due to the adoption of stable sawtooth waves.
The main disadvantages of the voltage control mode: when the load changes rapidly and even short circuits occur, the current pulse width does not react immediately due to the system response time, and the current passing through the switching tube is increased instantaneously and even damaged.
As shown in fig. 2, the principle of the current control mode is that an output pulse is formed by comparing an error amplification voltage Ve with a voltage drop Vs of a current sampling resistor Rs (which is equivalent to a current flowing through a switching tube), so as to control the switching tube to be turned on and off and adjust the output magnitude.
The current control mode has the main advantages that: the current flowing through the switching tube can be controlled by quickly responding to the current flowing through the switching tube, so that the problem of overcurrent of the switching tube is avoided.
Disadvantages of the current control scheme: when the duty ratio is more than 50%, subharmonic oscillation is generated, and slope compensation is needed; and secondly, because the voltage drop Vs signal is obtained from the power stage, noise in the power stage can affect the system.
When the power supply of the inverter welding machine is used for welding, the load is often short-circuited, such as knocking arcing of manual welding, intermediate droplet transition, short-circuit transition of gas shielded welding and the like. In this case, if the voltage control mode is adopted, the switching device is easily damaged due to overcurrent, so that the inverter welding machine mostly adopts the current control mode to ensure the stability of the switching device at present.
With the development of switching device technology, third generation semiconductor materials represented by silicon carbide and gallium nitride are being applied in the design of inverter welding machines by virtue of their superior properties such as high frequency, high efficiency, high power, high voltage resistance, high temperature resistance, and strong radiation resistance.
Compared with power devices such as a second-generation semiconductor material IGBT and the like, the power device of a third-generation semiconductor material is high in switching speed, so that noise generated in the switching process is larger, the defect that the noise in a power stage is sensitive in a current control mode is particularly obvious, and the noise of the whole system can be caused, and the system is unstable.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an output control circuit of an inverter welding machine, which has low noise sensitivity in a power stage, can make quick response to current flowing through a switching tube of a driving inverter circuit when a load is changed suddenly and even is in a short circuit, controls the current flowing through the switching tube, and ensures that the switching tube cannot generate an overcurrent problem.
In order to solve the technical problem, the output control circuit of the inverter welding machine provided by the invention comprises an error amplifier 10, a current calculation module 11, a synchronous clock module 12, a voltage control mode module 13, a current control mode module 14, an and circuit 15, a driving inverter circuit 16, a transformer 17 and a rectification output circuit 18;
the synchronous Clock module 12 is configured to provide the same Clock signal Clock for the voltage control mode module 13 and the current control mode module 14;
the positive and negative input ends of the error amplifier 10 are respectively connected with a reference voltage Vg and a welding power supply output feedback signal Vout, and output an error amplification voltage Ve to a voltage control mode module 13;
the voltage control mode module 13 compares the error amplification voltage Ve with the sawtooth wave Vr to form a voltage control voltage output pulse Vpwmv, and outputs the voltage control voltage output pulse Vpwmv to an input end of the and circuit 15;
the current calculation module 11 is configured to calculate a calculated voltage Vi according to the reference voltage Vg and the turn ratio n of the transformer, where Vi = Vg/n;
the current control mode module 14 compares the calculated voltage Vi with the current feedback signal Vpre output by the driving inverter circuit 16 to form a current control voltage output pulse Vpwmi, and outputs the current control voltage output pulse Vpwmi to the other input terminal of the and circuit 15;
the and circuit 15 performs an and operation on the input voltage control voltage output pulse Vpwmv and the current control voltage output pulse Vpwmi, and outputs a PWM signal to a control terminal of a switching tube of the driving inverter circuit 16;
the output end of the driving inverter circuit 16 is connected with one end of the primary winding of the transformer 17;
the secondary winding of the transformer 17 is connected with a rectification output circuit 18;
the rectification output circuit 18 rectifies and outputs the output of the secondary winding of the transformer 17.
Preferably, the voltage control mode module 13 includes a first PWM comparator and a first latch;
the positive input end and the negative input end of the first PWM comparator are respectively connected with the error amplification voltage Ve and the sawtooth wave Vr, and the output end of the first PWM comparator is connected with the R end of the first latch;
the first latch, whose S terminal is connected to the Clock signal Clock, and whose Q terminal outputs a voltage control voltage output pulse Vpwmv to one input terminal of the and circuit 15.
Preferably, the current control mode module 14 includes a second PWM comparator and a second latch;
the positive input end and the negative input end of the second PWM comparator are respectively connected to the calculated voltage Vi and the current feedback signal Vpre output by the driving inverter circuit 16, and the output end of the second PWM comparator is connected to the R end of the second latch;
the second latch, whose S terminal is connected to the Clock signal Clock, outputs a current control voltage output pulse Vpwmi to the other input terminal of the and circuit 15 at its Q terminal.
Preferably, the driving inverter circuit 16 adopts a single switching tube or an H-bridge PWM driving circuit.
Preferably, the current calculating module 11 is implemented by software or by hardware circuit.
Preferably, the current calculating module 11 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first operational amplifier OPAl;
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of the first operational amplifier OPAl;
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier OPAl, and the other end of the third resistor R3 is grounded;
the output of the first operational amplifier OPAl outputs the calculated voltage Vi.
Preferably, the current calculating module 11 is configured to calculate a calculated voltage Vi according to the reference voltage Vg, the offset voltage δ v, and the transformer turn ratio n, where Vi = Vg/n + δ v.
Preferably, the current calculating module 11 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first operational amplifier OPAl, and an offset voltage generating circuit 19;
the offset voltage generating circuit 19 is configured to output an offset voltage δ v, which is a negative voltage;
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of the first operational amplifier OPAl;
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier OPAl, and the other end of the third resistor R3 is grounded;
one end of the fourth resistor R4 and one end of the fifth resistor R5 are connected with the negative input end of the first operational amplifier OPAl;
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier OPAl.
The other end of the fifth resistor R5 is connected with the offset voltage deltav;
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier OPAl;
the output of the first operational amplifier OPAl outputs the calculated voltage Vi.
Preferably, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 all have a withstand power of 1/4W.
Preferably, R4>10R5, R4= R3.
In the output control circuit of the inverter welding machine, a voltage control mode module 13 and a current control mode module 14 adopt the same clock, an error amplifier 10 amplifies an error generated by a reference voltage Vg and a welding power supply output feedback signal (a welding power supply output voltage or a feedback signal of output current) Vout, outputs an error amplification voltage Ve to the voltage control mode module 13, and the voltage control mode module 13 compares the error amplification voltage Ve with a sawtooth wave Vr and synchronizes with a synchronous clock to form a voltage control voltage output pulse Vpwmv which is output to an input end of a circuit 15; the current calculation module 11 calculates a calculated voltage Vi according to a reference voltage Vg and a transformer turn ratio n, and the current control mode module 14 compares the calculated voltage Vi with a current feedback signal Vpre output by the driving inverter circuit 16 and synchronizes with a synchronous clock to form a current control voltage output pulse Vpwmi and outputs the current control voltage output pulse Vpwmi to the other input end of the and circuit 15; the and circuit 15 and-inputs the voltage control voltage output pulse Vpwmv and the current control voltage output pulse Vpwmi, and outputs a PWM signal to the control terminal of the switching tube of the driving inverter circuit 16. The voltage control mode module 13 is used for controlling the normal output current of the inverter welder, the current control mode module 14 is used for controlling the output current of the inverter welder during the instant load change (or short circuit), that is, when the load of the inverter welder changes normally, the voltage control mode module 13 functions, and when the load of the inverter welder changes instantly, such as a short circuit, the voltage control mode module 13 is closed in advance to make the pulse width shrink as soon as possible to limit the current output. The output control circuit of the inverter welding machine is low in noise sensitivity in a power level, is not influenced by other parameters of a circuit, can make quick response to current flowing through a switching tube of the driving inverter circuit 16 when a load changes rapidly or even is short-circuited, controls the current flowing through the switching tube, and ensures that the switching tube cannot have overcurrent.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the present invention are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art voltage control scheme for the power output of an inverter welder;
FIG. 2 is a schematic diagram of a prior art current control mode for the power output of an inverter welder;
FIG. 3 is a functional block diagram of one embodiment of an inverter welder output control circuit of the present invention;
FIG. 4 is a circuit diagram of a current calculating module of an embodiment of the inverter welder output control circuit of the present invention.
Description of reference numerals in the figures
10 an error amplifier; 11 a current calculation module; 12 synchronizing the clock modules; 13 a voltage control mode module; 14 current control mode module; 15 and a circuit; 16 driving an inverter circuit; 17 a transformer; 18 a rectified output circuit; 19 offset voltage generating circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of protection of the present invention.
As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Example one
As shown in fig. 3, the output control circuit of the inverter welding machine includes an error amplifier 10, a current calculating module 11, a synchronous clock module 12, a voltage control mode module 13, a current control mode module 14, an and circuit 15, a driving inverter circuit 16, a transformer 17 and a rectification output circuit 18;
the synchronous Clock module 12 is configured to provide the same Clock signal Clock for the voltage control mode module 13 and the current control mode module 14;
the positive and negative input ends of the error amplifier 10 are respectively connected with a reference voltage Vg and a welding power supply output feedback signal (feedback voltage) Vout, and output an error amplification voltage Ve to a voltage control mode module 13;
the voltage control mode module 13 compares the error amplification voltage Ve with the sawtooth wave Vr to form a voltage control voltage output pulse Vpwmv, and outputs the voltage control voltage output pulse Vpwmv to an input end of the and circuit 15;
the current calculation module 11 is configured to calculate a calculated voltage Vi according to the reference voltage Vg and the turn ratio n of the transformer, where Vi = Vg/n;
the current control mode module 14 compares the calculated voltage Vi with the current feedback signal Vpre output by the driving inverter circuit 16 to form a current control voltage output pulse Vpwmi, and outputs the current control voltage output pulse Vpwmi to the other input terminal of the and circuit 15;
the and circuit 15 performs an and operation on the input voltage control voltage output pulse Vpwmv and the current control voltage output pulse Vpwmi, and outputs a PWM signal to a control terminal of a switching tube of the driving inverter circuit 16;
the output end of the driving inverter circuit 16 is connected with one end of the primary winding of the transformer 17;
the secondary winding of the transformer 17 is connected with a rectification output circuit 18;
the rectification output circuit 18 rectifies and outputs the output of the secondary winding of the transformer 17.
The calculated current Ie is determined according to the reference current Ig and the transformer turn ratio n, and the specific formula is Ie = Ig/n. According to the inverse ratio of the turn ratio of the primary and secondary currents of the transformer, ipre (peak value) is approximately equal to Iout/n, the Ipre is the primary current of the transformer, the Iout is the output current (feedback current) of the welding power supply, and the expected output current (feedback current) Iout of the welding power supply is equal to the reference current Ig, so the calculated current Ie for controlling the peak value of the primary current Ipre of the transformer is approximately equal to Ig/n; by replacing the current correspondence with a voltage, vi = Vg/n.
In the output control circuit of the inverter welding machine according to the first embodiment, the voltage control mode module 13 and the current control mode module 14 use the same clock, the error amplifier 10 amplifies an error generated by the reference voltage Vg and a welding power output feedback signal (a feedback signal of the welding power output voltage or the output current) Vout, outputs an error amplified voltage Ve to the voltage control mode module 13, and the voltage control mode module 13 compares the error amplified voltage Ve with the sawtooth wave Vr and synchronizes with the synchronous clock to form a voltage control voltage output pulse Vpwmv which is output to an input end of the and circuit 15; the current calculation module 11 calculates a calculated voltage Vi according to a reference voltage Vg and a transformer turn ratio n, and the current control mode module 14 compares the calculated voltage Vi with a current feedback signal Vpre output by the driving inverter circuit 16 and synchronizes with a synchronous clock to form a current control voltage output pulse Vpwmi and outputs the current control voltage output pulse Vpwmi to the other input end of the and circuit 15; the and circuit 15 and-inputs the voltage control voltage output pulse Vpwmv and the current control voltage output pulse Vpwmi, and outputs a PWM signal to the control terminal of the switching tube of the driving inverter circuit 16. The voltage control mode module 13 is used for controlling the normal output current of the inverter welder, and the current control mode module 14 is used for controlling the output current of the inverter welder during the transient load change (or short circuit), that is, when the inverter welder load normally changes, the voltage control mode module 13 is used, and when the inverter welder load instantaneously changes, such as short circuit, the voltage control mode module 13 is closed in advance to enable the pulse width to shrink as soon as possible to limit the current output.
The output control circuit of the inverter welding machine in the first embodiment has low sensitivity to noise in a power stage, is not influenced by other parameters of a circuit, and can make quick response to current flowing through a switching tube of the driving inverter circuit 16 when a load is changed suddenly or even short-circuited, control the current flowing through the switching tube, and ensure that the switching tube cannot have an overcurrent problem.
Example two
Based on the inverter welder output control circuit of the first embodiment, the voltage control mode module 13 includes a first PWM comparator and a first latch;
the positive input end and the negative input end of the first PWM comparator are respectively connected with the error amplification voltage Ve and the sawtooth wave Vr, and the output end of the first PWM comparator is connected with the R end of the first latch;
the first latch, whose S terminal is the Clock signal Clock, and whose Q terminal outputs a voltage control voltage output pulse Vpwmv to one input terminal of the and circuit 15.
Preferably, the current control mode module 14 includes a second PWM comparator and a second latch;
the positive input end and the negative input end of the second PWM comparator are respectively connected to the calculated voltage Vi and the current feedback signal Vpre output by the driving inverter circuit 16, and the output end of the second PWM comparator is connected to the R end of the second latch;
the second latch, whose S terminal is connected to the Clock signal Clock, outputs a current control voltage output pulse Vpwmi to the other input terminal of the and circuit 15 at its Q terminal.
Preferably, the driving inverter circuit 16 uses a single switch tube or an H-bridge PWM driving circuit.
Preferably, the current calculating module 11 is implemented by software or by a hardware circuit.
EXAMPLE III
Based on the inverter welding machine output control circuit of the first embodiment, as shown in fig. 4, the current calculating module 11 includes a first resistor R1, a second resistor R2, a third resistor R3, and a first operational amplifier OPAl;
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of the first operational amplifier OPAl;
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier OPAl, and the other end of the third resistor R3 is grounded;
the output of the first operational amplifier OPAl outputs the calculated voltage Vi.
Example four
Based on the output control circuit of the inverter welding machine in the first embodiment, the current calculation module 11 is configured to calculate a calculated voltage Vi according to a reference voltage Vg, an offset voltage δ v, and a transformer turn ratio n, where Vi = Vg/n + δ v.
The calculation current Ie is determined according to three parameters of the reference current Ig, the transformer turn ratio n and the offset current δ i, and the specific formula is Ie = Ig/n + δ i. According to the inverse ratio of the turn ratio of the primary and secondary currents of the transformer, ipre (peak value) is approximately equal to Iout/n, the Ipre is the primary current of the transformer, the Iout is the output current (feedback current) of the welding power supply, and the expected output current (feedback current) Iout of the welding power supply is equal to the reference current Ig, so the calculated current Ie for controlling the peak value of the primary current Ipre of the transformer is approximately equal to Ig/n; by replacing the current correspondences with voltages, vi = Vg/n + δ v.
The offset voltage deltav (offset current deltai) is determined according to the primary inductance of the transformer 16 and the noise of a power level, and the function is to reserve a certain space for the calculation of a current loop so as to prevent the noise from influencing the inverter welding machine during normal work.
EXAMPLE five
Based on the output control circuit of the inverter welding machine in the fourth embodiment, as shown in fig. 4, the current calculating module 11 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first operational amplifier OPAl, and an offset voltage generating circuit 19;
the offset voltage generating circuit 19 is configured to output an offset voltage δ v, which is a negative voltage;
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of the first operational amplifier OPAl;
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier OPAl, and the other end of the third resistor R3 is grounded;
one end of the fourth resistor R4 and one end of the fifth resistor R5 are connected with the negative input end of the first operational amplifier OPAl;
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier OPAl.
The other end of the fifth resistor R5 is connected with the offset voltage deltav;
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier OPAl;
the output of the first operational amplifier OPAl outputs the calculated voltage Vi.
Preferably, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 all have a withstand power of 1/4W.
Preferably, R4>10R5, R4= R3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An output control circuit of an inverter welding machine is characterized by comprising an error amplifier (10), a current calculation module (11), a synchronous clock module (12), a voltage control mode module (13), a current control mode module (14), an AND circuit (15), a driving inverter circuit (16), a transformer (17) and a rectification output circuit (18);
the synchronous Clock module (12) is used for providing the same Clock signal (Clock) for the voltage control mode module (13) and the current control mode module (14);
the positive input end and the negative input end of the error amplifier (10) are respectively connected with a reference voltage Vg and a welding power supply output feedback signal (Vout), and an error amplification voltage (Ve) is output to a voltage control mode module (13);
the voltage control mode module (13) compares the error amplification voltage (Ve) with the sawtooth wave (Vr) to form a voltage control voltage output pulse (Vpwmv) and outputs the voltage control voltage output pulse (Vpwmv) to one input end of the AND circuit (15);
the current calculation module (11) is used for calculating a calculation voltage Vi according to a reference voltage Vg and a transformer turn ratio n, wherein Vi = Vg/n;
the current control mode module (14) compares the calculated voltage Vi with a current feedback signal (Vpre) output by the driving inverter circuit (16) to form a current control voltage output pulse (Vpwmi) and outputs the current control voltage output pulse (Vpwmi) to the other input end of the AND circuit (15);
the AND circuit (15) is used for performing AND operation on an input voltage control voltage output pulse (Vpwmv) and a current control voltage output pulse (Vpwmi) and outputting a PWM signal to a control end of a switching tube of the driving inverter circuit (16);
the output end of the driving inverter circuit (16) is connected with one end of a primary winding of a transformer (17);
a secondary winding of the transformer (17) is connected with a rectification output circuit (18);
and the rectification output circuit (18) rectifies and outputs the output of the secondary winding of the transformer (17).
2. The inverter welder output control circuit of claim 1,
the voltage control mode module (13) comprises a first PWM comparator and a first latch;
the positive input end and the negative input end of the first PWM comparator are respectively connected with an error amplification voltage (Ve) and a sawtooth wave (Vr), and the output end of the first PWM comparator is connected with the R end of the first latch;
the first latch, its S terminal is clocked by a Clock signal (Clock), and its Q terminal outputs a voltage control voltage output pulse (Vpwmv) to one input terminal of the and circuit (15).
3. The inverter welder output control circuit of claim 1,
the current control mode module (14) comprises a second PWM comparator and a second latch;
the positive input end and the negative input end of the second PWM comparator are respectively connected with the calculated voltage Vi and the output current feedback signal (Vpre) of the driving inverter circuit (16), and the output end of the second PWM comparator is connected with the R end of the second latch;
the second latch, whose S terminal is connected to a Clock signal (Clock), and whose Q terminal outputs a current control voltage output pulse (Vpwmi) to the other input terminal of the and circuit (15).
4. The inverter welder output control circuit according to claim 1,
the driving inverter circuit (16) adopts a single switching tube or an H-bridge PWM driving circuit.
5. The inverter welder output control circuit according to claim 1,
the current calculation module (11) is realized by software or by a hardware circuit.
6. The inverter welder output control circuit of claim 1,
the current calculation module (11) comprises a first resistor R1, a second resistor R2, a third resistor R3 and a first operational amplifier (OPAl);
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of a first operational amplifier (OPAl);
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier (OPAl), and the other end is grounded;
the output of the first operational amplifier (OPAl) outputs the calculated voltage Vi.
7. The inverter welder output control circuit according to claim 1,
the current calculation module (11) is used for calculating and obtaining a calculation voltage Vi according to a reference voltage Vg, an offset voltage delta v and a transformer turn ratio n, wherein Vi = Vg/n + delta v.
8. The inverter welder output control circuit according to claim 7,
the current calculation module (11) comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first operational amplifier (OPAl) and an offset voltage generation circuit 19;
the offset voltage generation circuit 19 is configured to output an offset voltage δ v, where the offset voltage δ v is a negative voltage;
the resistance value of the first resistor R1 is (n-1) times that of the second resistor R2;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the positive input end of a first operational amplifier (OPAl);
the other end of the first resistor R1 is connected with a reference voltage Vg;
the other end of the second resistor R2 is grounded;
one end of the third resistor R3 is connected with the negative input end of the first operational amplifier (OPAl), and the other end is grounded;
one end of the fourth resistor R4 and one end of the fifth resistor R5 are connected with the negative input end of the first operational amplifier (OPAl);
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier (OPAl).
The other end of the fifth resistor R5 is connected with the offset voltage deltav;
the other end of the fourth resistor R4 is connected with the output end of the first operational amplifier (OPAl);
the output of the first operational amplifier (OPAl) outputs the calculated voltage Vi.
9. The inverter welder output control circuit according to claim 8,
the enduring power of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 is 1/4W.
10. The inverter welder output control circuit according to claim 8,
R4>10R5，R4＝R3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211720170.8A CN115870590A (en) | 2022-12-30 | 2022-12-30 | Output control circuit of inverter welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211720170.8A CN115870590A (en) | 2022-12-30 | 2022-12-30 | Output control circuit of inverter welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115870590A true CN115870590A (en) | 2023-03-31 |
Family
ID=85757436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211720170.8A Pending CN115870590A (en) | 2022-12-30 | 2022-12-30 | Output control circuit of inverter welding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115870590A (en) |
-
2022
- 2022-12-30 CN CN202211720170.8A patent/CN115870590A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2500999B2 (en) | Switch mode converter | |
| CN102257714B (en) | Resonant converter | |
| JP6024188B2 (en) | Power supply control circuit | |
| EP1138110A1 (en) | Llc converter, and method for controlling an llc converter | |
| KR102560435B1 (en) | Switching regulator | |
| CN112054658A (en) | Control method and control circuit of switching power supply circuit and switching power supply | |
| JP2000166223A (en) | Step-up/down dc/dc converter | |
| CN110492741B (en) | Voltage clamp circuit and buck converter | |
| US5901052A (en) | Switched-mode power supply having a delay-insensitive timing in the control loop | |
| CN115870590A (en) | Output control circuit of inverter welding machine | |
| Rabello et al. | An isolated DC-DC boost converter using two cascade control loops | |
| CN219093931U (en) | Output control circuit of inverter welding machine | |
| US11923771B2 (en) | Control circuit and power source circuit | |
| KR101022613B1 (en) | Alternating current power supply device and integrated circuit for alternating current power supply device | |
| CN211506286U (en) | Auxiliary power supply circuit with wide input voltage range | |
| JP5130664B2 (en) | Switching power supply | |
| CN107276570A (en) | A kind of slope is superimposed PWM comparison circuits | |
| JP2515650B2 (en) | Power factor correction circuit and switching power supply circuit using the power factor correction circuit | |
| CN110207836B (en) | Single photon detector and high-voltage fast regulating circuit thereof | |
| Lai et al. | A current-mode DC–DC buck converter with accurate current limit using multiplex PWM comparator | |
| CN116722720B (en) | Auxiliary circuit, power supply system and electronic device | |
| JP2002051549A (en) | Semiconductor device for switching power supply | |
| JP2003339160A (en) | Switching power supply | |
| CN113433996A (en) | Auxiliary power supply circuit with wide input voltage range | |
| CN117614392A (en) | Oscillator and switching converter thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |