CN108258885B - Inverter welding power supply drive control device - Google Patents
Inverter welding power supply drive control device Download PDFInfo
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- CN108258885B CN108258885B CN201611239450.1A CN201611239450A CN108258885B CN 108258885 B CN108258885 B CN 108258885B CN 201611239450 A CN201611239450 A CN 201611239450A CN 108258885 B CN108258885 B CN 108258885B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
The invention relates to an inverter welding power supply driving control device which comprises a PWM waveform controller, a first waveform separation circuit, a first driving signal processing circuit, a second waveform separation circuit and a second driving signal processing circuit, wherein a first output end and a second output end of the PWM waveform controller are respectively connected with the first waveform separation circuit and the second waveform separation circuit, the first driving signal processing circuit is connected with the first waveform separation circuit and the second waveform separation circuit and is also used for being connected with corresponding parallel switch tube assemblies in a frequency converter of an inverter welding power supply, and the second driving signal processing circuit is connected with the first waveform separation circuit and the second waveform separation circuit and is also used for being connected with corresponding parallel switch tube assemblies in the frequency converter. When a single switching tube in the frequency converter works at low frequency through wave isolation separation, the main transformer of the inverter welding power supply can be ensured to have higher working frequency, the dynamic response speed of the whole machine is improved, the electric energy loss can be reduced, and the welding performance and the reliability are improved.
Description
Technical Field
The invention relates to the technical field of inverter welding machine power supplies, in particular to an inverter welding power supply drive control device.
Background
With the rapid development and the increasing popularization of welding power supplies, the demands of users on power supplies are increasing, and welding power supply manufacturers are required to produce more efficient and better green power supplies so as to reduce the electric energy loss and reduce the burden and the pollution of a power grid. The most effective method for reducing the electric energy loss is to improve the working frequency of the machine, namely, the inverter welding power supply is required to have higher working frequency, so that the size of the main transformer is reduced, the number of turns of the primary and secondary windings is reduced, the cross section of a magnetic core of the transformer is reduced, and the purpose of reducing copper loss and iron loss is achieved.
The traditional inverter welding power supply adopts a direct drive mode, the working frequency of the welding power supply is limited by the performance of a switching tube (IGBT), the conventional switching tube (IGBT) generally works within 25KHZ and is safe and reliable, the frequency is difficult to be increased to more than 40KHZ, and the switching tube (IGBT) is easy to lose efficacy. Therefore, the inverter welding power supply has the defect of low reliability by directly increasing the working frequency to reduce the electric energy loss.
Disclosure of Invention
In view of the above, it is desirable to provide a highly reliable inverter welding power supply drive control device that can increase the frequency and reduce the power consumption.
A driving control device of an inverter welding power supply comprises a PWM waveform controller, a first waveform separation circuit, a first driving signal processing circuit, a second waveform separation circuit and a second driving signal processing circuit, wherein a first output end and a second output end of the PWM waveform controller are connected with the first waveform separation circuit and the second waveform separation circuit, the first driving signal processing circuit is connected with the first waveform separation circuit and the second waveform separation circuit and is also used for being connected with corresponding parallel switch tube assemblies in a frequency converter of the inverter welding power supply, the second driving signal processing circuit is connected with the first waveform separation circuit and the second waveform separation circuit and is also used for being connected with corresponding parallel switch tube assemblies in the frequency converter,
a first output end of the PWM waveform controller outputs a first pulse waveform to the first waveform separation circuit and the second waveform separation circuit, a second output end of the PWM waveform controller outputs a second pulse waveform to the first waveform separation circuit and the second waveform separation circuit, and the first pulse waveform and the second pulse waveform have the same frequency and 180-degree phase difference;
the first waveform separation circuit takes the second pulse waveform as a reference signal, filters odd-numbered pulses in the first pulse waveform to obtain a first pulse signal and outputs the first pulse signal to the first driving signal processing circuit, and filters odd-numbered pulses in the second pulse waveform to obtain a second pulse signal and outputs the second pulse signal to the second driving signal processing circuit;
the second waveform separation circuit takes the first pulse waveform as a reference signal, filters out pulses of even times in the first pulse waveform to obtain a third pulse signal and outputs the third pulse signal to the first driving signal processing circuit, and filters out pulses of even times in the second pulse waveform to obtain a fourth pulse signal and outputs the fourth pulse signal to the second driving signal processing circuit;
and the first driving signal processing circuit and the second driving signal processing circuit control the switching tubes in the corresponding parallel switching tube assemblies in the frequency converter to be alternately conducted according to the received pulse signals.
According to the inverter welding power supply drive control device, the first pulse waveform is subjected to wave isolation separation by the first waveform separation circuit and the second waveform separation circuit, the frequency of the obtained first pulse signal and the third pulse signal is halved, the pulse width is unchanged, the wave isolation separation is performed on the second pulse waveform, and the frequency of the obtained second pulse signal and the fourth pulse signal is halved, and the single pulse width is unchanged. The first driving signal processing circuit controls the switch tubes in the corresponding parallel switch tube assemblies in the frequency converter of the inverter welding power supply to be alternately switched on by utilizing the first pulse signal and the third pulse signal, and the second driving signal processing circuit controls the switch tubes in the corresponding parallel switch tube assemblies in the frequency converter of the inverter welding power supply to be alternately switched on by utilizing the second pulse signal and the fourth pulse signal. The work frequency of the main transformer of the inverter welding power supply is twice of the work frequency of a single switch tube in the frequency converter through wave isolation separation, and even if the single switch tube in the frequency converter works at low frequency, the main transformer of the inverter welding power supply can be ensured to have higher work frequency, the dynamic response speed of the whole machine is improved, the electric energy loss can be reduced, and the welding performance and the reliability are improved.
Drawings
FIG. 1 is a schematic diagram of an inverter welding power supply driving control apparatus according to an embodiment;
FIG. 2 is a schematic diagram of an inverter welding power supply driving control apparatus according to an embodiment;
fig. 3 is a schematic waveform diagram illustrating the first waveform separation circuit and the second waveform separation circuit performing wave-isolating separation in an embodiment.
Detailed Description
In one embodiment, the inverter welding power supply driving control device is suitable for isolated wave separation of driving of a high-power inverter welding machine above 40 KHZ. As shown in fig. 1, the apparatus includes a PWM waveform controller 110, a first waveform separation circuit 120, a first driving signal processing circuit 130, a second waveform separation circuit 140, and a second driving signal processing circuit 150, wherein a first output terminal and a second output terminal of the PWM waveform controller 110 are connected to the first waveform separation circuit 120 and the second waveform separation circuit 130, the first driving signal processing circuit 140 is connected to the first waveform separation circuit 120 and the second waveform separation circuit 130, and is further configured to be connected to corresponding parallel switch tube assemblies in a converter of an inverter welding power source, and the second driving signal processing circuit 150 is connected to the first waveform separation circuit 120 and the second waveform separation circuit 130, and is further configured to be connected to corresponding parallel switch tube assemblies in the converter.
A first output terminal of the PWM waveform controller 110 outputs a first pulse waveform to the first waveform separator circuit 120 and the second waveform separator circuit 130, and a second output terminal of the PWM waveform controller 110 outputs a second pulse waveform to the first waveform separator circuit 120 and the second waveform separator circuit 130, where the first pulse waveform and the second pulse waveform have the same frequency and 180 degrees phase difference. The frequencies of the first pulse waveform and the second pulse waveform are not exclusive and may be greater than or equal to 40 KHZ.
The first waveform separating circuit 120 filters the odd-numbered pulses in the first pulse waveform with the second pulse waveform as a reference signal to obtain a first pulse signal and outputs the first pulse signal to the first driving signal processing circuit 140, and filters the odd-numbered pulses in the second pulse waveform to obtain a second pulse signal and outputs the second pulse signal to the second driving signal processing circuit 150.
The second waveform separating circuit 130 filters even-numbered pulses in the first pulse waveform with the first pulse waveform as a reference signal to obtain a third pulse signal and outputs the third pulse signal to the first driving signal processing circuit 140, and filters even-numbered pulses in the second pulse waveform to obtain a fourth pulse signal and outputs the fourth pulse signal to the second driving signal processing circuit 150.
The first driving signal processing circuit 140 and the second driving signal processing circuit 150 control the switching tubes of the corresponding parallel switching tube assemblies in the frequency converter to be alternately conducted according to the received pulse signals.
Specifically, the PWM waveform controller 110 may be connected to a main control board of a main circuit of the inverter welding power supply, and a frequency converter in the main circuit receives a direct current and outputs an alternating current to a main transformer. The main control board collects the output voltage and the output current of the main transformer, and controls the PWM waveform controller 110 to output two pulse waveforms having the same pulse width and frequency and a phase difference of 180 degrees according to the collection result. The first waveform separation circuit 120 uses the rising edge of the first pulse waveform as a trigger condition, allows even-numbered pulses of the first pulse waveform and the second pulse waveform to pass through, and prevents odd-numbered pulses of the first pulse waveform and the second pulse waveform from passing through, thereby obtaining a first pulse signal and a second pulse signal respectively. The second waveform separation circuit 130 uses the rising edge of the first pulse waveform as a trigger condition, allows the odd-numbered pulses of the first pulse waveform and the second pulse waveform to pass through, and prevents the even-numbered pulses of the first pulse waveform and the second pulse waveform from passing through, so as to obtain a third pulse signal and a fourth pulse signal respectively.
The frequency converter specifically includes four parallel switch tube assemblies, and the manner of controlling the switch tubes in the corresponding parallel switch tube assemblies to be alternately turned on by the first driving signal processing circuit 140 and the second driving signal processing circuit 150 according to the received pulse signal is not unique. In this embodiment, the first driving signal processing circuit 140 generates two paths of signals with the same frequency, pulse width and phase as the first pulse signal and two paths of signals with the same frequency, pulse width and phase as the third pulse signal, and sends the generated four paths of signals to two corresponding parallel switch tube assemblies in the frequency converter to control the switch tubes therein to be alternately turned on. The second driving signal processing circuit 150 generates two paths of signals with the same frequency, pulse width and phase as the second pulse signal and two paths of signals with the same frequency, pulse width and phase as the fourth pulse signal, and sends the generated four paths of signals to the other two parallel switch tube assemblies in the frequency converter to control the switch tubes in the frequency converter to be alternately conducted.
For example, four parallel switch tube assemblies in the frequency converter are respectively an assembly a, an assembly B, an assembly C and an assembly D, the assembly a is connected in series with the assembly B, the assembly C is connected in series with the assembly D, the other ends of the assembly a and the assembly C are connected in parallel and serve as an input positive electrode of the frequency converter, the other ends of the assembly B and the assembly D are connected in parallel and serve as an input negative electrode of the frequency converter, a common end of the assembly a and the assembly B serves as a first output end of the frequency converter, and a common end of the assembly C and the assembly D serves as a second output end of the frequency converter. The component A is formed by connecting a switch tube A 'and a switch tube A' in parallel, the component B is formed by connecting a switch tube B 'and a switch tube B' in parallel, the component C is formed by connecting a switch tube C 'and a switch tube C' in parallel, and the component D is formed by connecting a switch tube D 'and a switch tube D' in parallel. Two paths of signals with the same frequency, pulse width and phase as the first pulse signal respectively control the on-off of the switch tube A 'and the switch tube D', and two paths of signals with the same frequency, pulse width and phase as the third pulse signal respectively control the on-off of the switch tube A 'and the switch tube D'. Two paths of signals with the same frequency, pulse width and phase as the second pulse signal respectively control the on-off of the switch tube B 'and the switch tube C', and two paths of signals with the same frequency, pulse width and phase as the fourth pulse signal respectively control the on-off of the switch tube B 'and the switch tube C'. Because the phase difference between the first pulse signal and the third pulse signal is 180 degrees, and the phase difference between the second pulse signal and the fourth pulse signal is 180 degrees, two switching tubes in the component A, the component B, the component C and the component D can be controlled to be alternately conducted, and therefore the working frequency of the main transformer is twice of the working frequency of a single switching tube in the frequency converter. For example, when the frequency of the first pulse waveform and the second pulse waveform is 40KHZ, the frequency of the four paths of pulse signals obtained by wave isolation separation is 20KHZ, eight paths of signals are generated according to the four paths of pulse signals to control a single switching tube in the frequency converter to work at 20KHZ, and the working frequency of the main transformer is 40KHZ, so that the cross section of an iron core of the main transformer and the number of primary turns can be reduced, and cost control is facilitated.
It is understood that in other embodiments, the first driving signal processing circuit 140 and the second driving signal processing circuit 150 may also directly send the received pulse signals to the corresponding parallel switch tube assemblies for on-off control.
In the inverter welding power supply drive control device, the first pulse waveform is subjected to wave isolation separation by using the first waveform separation circuit 120 and the second waveform separation circuit 130, the frequency of the obtained first pulse signal and the third pulse signal is halved, and the pulse width is unchanged, and the frequency of the obtained second pulse signal and the fourth pulse signal is halved, and the single pulse width is unchanged. The first driving signal processing circuit 140 controls the switching tubes in the corresponding parallel switching tube assemblies in the frequency converter of the inverter welding power supply to be alternately turned on by using the first pulse signal and the third pulse signal, and the second driving signal processing circuit 150 controls the switching tubes in the corresponding parallel switching tube assemblies in the frequency converter of the inverter welding power supply to be alternately turned on by using the second pulse signal and the fourth pulse signal. The work frequency of the main transformer of the inverter welding power supply is twice of the work frequency of a single switch tube in the frequency converter through wave isolation separation, and even if the single switch tube in the frequency converter works at low frequency, the main transformer of the inverter welding power supply can be ensured to have higher work frequency, the dynamic response speed of the whole machine is improved, the electric energy loss can be reduced, and the welding performance and the reliability are improved.
In one embodiment, as shown in fig. 2, the first waveform splitter circuit 120 includes a first D flip-flop U5, a first switch tube K5, a second switch tube K6, a first diode D1, and a second diode D2. In this embodiment, the first D flip-flop U5 is a CD4013D flip-flop, and the first switch transistor K5 and the second switch transistor K6 are MOS transistors.
The first D trigger U5 is connected with the second output end of the PWM waveform controller 110, the control end of the first switch tube K5 is connected with the anode of the first diode D1 and the first output end of the PWM waveform controller 110, the cathode of the first diode D1 is connected with the first D trigger U5, the input end of the first switch tube K5 is connected with the first output end of the PWM waveform controller 110, and the output end of the first switch tube K5 is connected with the first drive signal processing circuit 140; a control end of the second switching tube K6 is connected to an anode of the second diode D2 and a second output end of the PWM waveform controller 110, a cathode of the second diode D2 is connected to the first D flip-flop U5, an input end of the second switching tube K6 is connected to the second output end of the PWM waveform controller 110, and an output end of the second switching tube K6 is connected to the second driving signal processing circuit 150.
Specifically, the port CLK of the first D flip-flop U5 is connected to the second output terminal of the PWM waveform controller 110, and receives the second pulse waveform OUT-B as a reference signal. The port Q of the first D flip-flop U5 is connected to the cathode of the first diode D1, the port D and the port of the first D flip-flop U5
The cathode of the second diode D2 is connected and the port S of the first D flip-flop U5 is grounded. The mutexistence of the waveform is controlled by a first D trigger U5, a first switch tube K5 and a second switch tube K6, a first pulse signal A-1 is obtained by separating a first pulse waveform OUT-A, a second pulse signal B-1 is obtained by separating a second pulse waveform OUT-B, the purpose of wave isolation and separation is achieved, the frequency of the separated waveform is half of the original frequency, and a single working pulse width is not equalAnd (6) changing.
In one embodiment, the first waveform splitter circuit 120 further includes a first power amplifier U3, a second power amplifier U1, a third power amplifier U4, and a fourth power amplifier U2, all of which are CD4050 power amplifiers in this embodiment.
The input end of the first power amplifier U3 is connected with the first output end of the PWM waveform controller 110, the output end of the first power amplifier U3 is connected with the input end of the second power amplifier U1 and the anode of the first diode D1, and the output end of the second power amplifier U1 is connected with the control end of the first switch tube K5; an input end of the third power amplifier U4 is connected to the second output end of the PWM waveform controller 110, an output end of the third power amplifier U4 is connected to an input end of the fourth power amplifier U2 and an anode of the second diode D2, and an output end of the fourth power amplifier U2 is connected to a control end of the second switching tube K6.
The power amplifier amplifies the passed signals to perform auxiliary control, and control reliability is improved. In addition, the first waveform separation circuit 120 may further include a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, and a resistor R14. The first power amplifier U3 is connected to the PWM waveform controller 110 through a resistor R11, the second power amplifier U1 and the first diode D1 through a resistor R9, and the second power amplifier U1 is connected to the first switching tube K5 through a resistor R7. The third power amplifier U4 is connected with the PWM waveform controller 110 through a resistor R12, the fourth power amplifier U2 and the second diode D2 through a resistor R10, the fourth power amplifier U2 is connected with the second switch tube K6 through a resistor R8, and the CLK of the port of the first D flip-flop U5 is connected with the PWM waveform controller 110 through a resistor R14.
In one embodiment, with continued reference to fig. 2, the second waveform separation circuit 130 includes a second D flip-flop U10, a third switching tube K12, a fourth switching tube K13, a third diode D3, and a fourth diode D4. In this embodiment, the second D flip-flop U10 is a CD4013D flip-flop, and the third switch transistor K12 and the fourth switch transistor K13 are MOS transistors.
The second D flip-flop U10 is connected to the first output terminal of the PWM waveform controller 110, the control terminal of the third switching tube K12 is connected to the anode of the third diode D3 and the second output terminal of the PWM waveform controller 110, the cathode of the third diode D3 is connected to the second D flip-flop U10, the input terminal of the third switching tube K12 is connected to the second output terminal of the PWM waveform controller 110, and the output terminal of the third switching tube K12 is connected to the second driving signal processing circuit 150; a control end of the fourth switching tube K13 is connected to an anode of the fourth diode D4 and a first output end of the PWM waveform controller 110, a cathode of the fourth diode D4 is connected to the second D flip-flop U10, an input end of the fourth switching tube K13 is connected to the first output end of the PWM waveform controller 110, and an output end of the fourth switching tube K13 is connected to the first driving signal processing circuit 150.
Specifically, the port CLK of the second D flip-flop U10 is connected to the first output terminal of the PWM waveform controller 110, and receives the first pulse waveform OUT-a as a reference signal. The port Q of the second D flip-flop U10 is connected with the cathode of the third diode D3 and the cathode of the fourth diode D4, and the port D of the second D flip-flop U10 is connected with the port
Port S of the second D flip-flop U10 is grounded. The mutexistence of the waveform is controlled by a second D trigger U10, a third switching tube K12 and a fourth switching tube K13, a third pulse signal A-2 is obtained by separating a first pulse waveform OUT-A, a fourth pulse signal B-2 is obtained by separating a second pulse waveform OUT-B, the purpose of wave isolation separation is achieved, the frequency of the separated waveforms is half of the original frequency, and the width of a single working pulse is unchanged.
In one embodiment, the second waveform splitter circuit 130 further includes a fifth power amplifier U8, a sixth power amplifier U6, a seventh power amplifier U9, and an eighth power amplifier U7, all of which are CD4050 power amplifiers in this embodiment.
The input end of the fifth power amplifier U8 is connected to the second output end of the PWM waveform controller 110, the output end of the fifth power amplifier U8 is connected to the input end of the sixth power amplifier U6 and the anode of the third diode D3, and the output end of the sixth power amplifier U6 is connected to the control end of the third switching tube K12; an input end of the seventh power amplifier U9 is connected to the first output end of the PWM waveform controller 110, an output end of the seventh power amplifier U9 is connected to an input end of the eighth power amplifier U7 and an anode of the fourth diode D4, and an output end of the eighth power amplifier U7 is connected to a control end of the fourth switching tube K13.
The power amplifier amplifies the passed signals to perform auxiliary control, and control reliability is improved. In addition, the second waveform separation circuit 130 may further include a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, and a resistor R28. The fifth power amplifier U8 is connected to the PWM waveform controller 110 through a resistor R25, the sixth power amplifier U6 and the third diode D3 through a resistor R23, and the sixth power amplifier U6 is connected to the third switching tube K12 through a resistor R21. The seventh power amplifier U9 is connected with the PWM waveform controller 110 through a resistor R26, the eighth power amplifier U7 and the fourth switching tube D4 through a resistor R24, the eighth power amplifier U7 is connected with the fourth switching tube K13 through a resistor R22, and the CLK of the port of the second D flip-flop U10 is connected with the PWM waveform controller 110 through a resistor R28.
The above is a specific structural diagram of the first waveform separation circuit 120 and the second waveform separation circuit 130, and the second waveform separation circuit 130 is taken as an example for detailed explanation.
As shown in fig. 2, when the second D flip-flop U10 detects the first rising edge of the first pulse waveform OUT-a with the first pulse waveform OUT-a as a reference, the "Q terminal" output of the second D flip-flop U10 is at a high level and locked, and the third switching tube K12 and the fourth switching tube K13 are turned on, and the first rising edge of the first pulse waveform OUT-a and the first rising edge of the second pulse waveform OUT-B are allowed to pass through; when the second D flip-flop U10 detects the second rising edge of the first pulse waveform OUT-a, the output of the "Q terminal" of the second D flip-flop U10 is low and locked, the third switch tube K12 and the fourth switch tube K13 are turned off, i.e., the second cycle is output without pulses, when the second D flip-flop U10 detects the third rising edge of the first pulse waveform OUT-a, the output of the "Q terminal" of the second D flip-flop U10 is high and locked, and at this time, the third switch tube K12 and the fourth switch tube K13 are turned on, the third rising edges of the first pulse waveform OUT-a and the second pulse waveform OUT-B are allowed to pass, when the second D-flip-flop U10 detects the fourth rising edge of the first pulse waveform OUT-a, the "Q-side" output of the second D-flip-flop U10 is low and locked, and the like to obtain the required third pulse signal A-2 and fourth pulse signal B-2. And the first pulse signal A-1 and the second pulse signal B-1 can be obtained by taking the second pulse waveform OUT-B as a reference.
As shown in fig. 3, the frequency of the first pulse signal a-1 and the third pulse signal a-2 is half of the frequency of the first pulse waveform OUT-a, the width of a single pulse is not changed, the phase of the first pulse signal a-1 and the third pulse signal a-2 is different by 180 °, (a-1) + (a-2) is equal to the frequency of the first pulse waveform OUT-a; the frequency of the second pulse signal B-1 and the fourth pulse signal B-2 is half of the frequency of the second pulse waveform OUT-B, the single pulse width is unchanged, the phase of the second pulse signal B-1 and the phase of the fourth pulse signal B-2 are different by 180 degrees, and (B-1) + (B-2) is equal to the frequency of the OUT-B waveform.
In one embodiment, with continued reference to fig. 2, the first driving signal processing circuit 140 includes a fifth switching tube K1, a sixth switching tube K2, a seventh switching tube K3, an eighth switching tube K4, a first transformer T1 and a first driving signal processing unit, the first transformer T1 includes a primary winding and four secondary windings, and the number of the first driving signal processing units is the same as the number of the secondary windings of the first transformer, which are respectively the unit 141, the unit 142, the unit 143 and the unit 144. In this embodiment, the fifth switching tube K1, the sixth switching tube K2, the seventh switching tube K3 and the eighth switching tube K4 are MOS tubes.
The input end of the fifth switching tube K1 is connected to the power supply access end, specifically connected to 15 v dc, the output end of the fifth switching tube K1 is connected to the input end of the sixth switching tube K2, the output end of the sixth switching tube K2 is grounded, the control end of the fifth switching tube K1 and the control end of the sixth switching tube K2 are connected to the first waveform separation circuit 120, specifically connected to the output end of the first switching tube K5 in the first waveform separation circuit 120.
The input end of a seventh switching tube K3 is connected to the power supply access end, specifically connected to 15 v dc, the output end of the seventh switching tube K3 is connected to the input end of an eighth switching tube K4, the output end of the eighth switching tube K4 is grounded, the control end of the seventh switching tube K3 and the control end of the eighth switching tube K4 are connected to the second waveform separation circuit 130, specifically connected to the output end of a fourth switching tube K13 in the second waveform separation circuit 130.
The common end of the fifth switching tube K1 and the sixth switching tube K2 is connected with one end of the primary winding of the first transformer T1, and the common end of the seventh switching tube K3 and the eighth switching tube K4 is connected with the other end of the primary winding of the first transformer T1; each secondary winding of the first transformer T1 is connected to a first driving signal processing unit, and each first driving signal processing unit is used for connecting to a corresponding parallel switch tube assembly in the frequency converter. Specifically, the unit 141 and the unit 142 respectively connect the control ends of the two switch tubes in the assembly a, and the unit 143 and the unit 144 respectively connect the control ends of the two switch tubes in the assembly D. The four paths of signals output by the first driving signal processing circuit 140 control the switching tubes in the two corresponding parallel switching tube assemblies to be alternately switched on and off.
In one embodiment, the first driving signal processing circuit 140 further includes a first peak absorbing circuit 145, and a common terminal of the fifth switching tube K1 and the sixth switching tube K2 is connected to the primary winding of the first transformer T1 through the peak absorbing circuit 145. The stability of the inverter welding power supply drive control device is improved by performing peak absorption through the peak absorption circuit 145. Further, the first peak absorption circuit 145 includes a first absorption resistor R2 and a first absorption capacitor C1, after the first absorption resistor R2 and the first absorption capacitor C1 are connected in parallel, one end of the first absorption resistor R1 is connected to a common end of the fifth switching tube K1 and the sixth switching tube K2, and the other end of the first absorption resistor R1 is connected to the primary winding of the first transformer T1.
In addition, the first driving signal processing circuit 140 may further include a resistor R1, a resistor R3, a resistor R4, a resistor R5, and a resistor R6. The input end of the fifth switching tube K1 and the input end of the seventh switching tube K3 are connected to the power supply access end through a resistor R1, the control end of the fifth switching tube K1 is connected to the first waveform separation circuit 120 through a resistor R3, and the control end of the sixth switching tube K2 is connected to the first waveform separation circuit 120 through a resistor R4. The control end of the seventh switch tube K3 is connected to the second waveform separation circuit 130 through a resistor R5, and the control end of the eighth switch tube K4 is connected to the second waveform separation circuit 130 through a resistor R6.
In one embodiment, the second driving signal processing circuit 150 includes a ninth switching tube K8, a tenth switching tube K9, an eleventh switching tube K10, a twelfth switching tube K11, a second transformer T2 and a second driving signal processing unit, the second transformer T2 includes a primary winding and four secondary windings, and the number of the second driving signal processing units is the same as the number of the secondary windings of the second transformer T2, which are the unit 151, the unit 152, the unit 153 and the unit 154, respectively. In this embodiment, the ninth switching tube K8, the tenth switching tube K9, the eleventh switching tube K10 and the twelfth switching tube K11 are MOS tubes.
The input end of the ninth switching tube K8 is connected to the power supply access end, specifically connected to 15 v dc, the output end of the ninth switching tube K8 is connected to the input end of the tenth switching tube K9, the output end of the tenth switching tube K9 is grounded, the control end of the ninth switching tube K8 and the control end of the tenth switching tube K9 are connected to the first waveform separation circuit 120, specifically connected to the output end of the second switching tube K6 in the first waveform separation circuit 120.
An input end of the eleventh switch tube K10 is connected to the power supply access end, specifically, 15 v dc power is accessed, an output end of the eleventh switch tube K10 is connected to an input end of the twelfth switch tube K11, an output end of the twelfth switch tube K11 is grounded, a control end of the eleventh switch tube K10 and a control end of the twelfth switch tube K11 are connected to the second waveform separation circuit 130, and specifically, connected to an output end of the third switch tube K12 in the second waveform separation circuit 130.
The common end of the ninth switching tube K8 and the tenth switching tube K9 is connected with one end of the primary winding of the second transformer T2, and the common end of the eleventh switching tube K10 and the twelfth switching tube K11 is connected with the other end of the primary winding of the second transformer T2; each secondary winding of the second transformer T2 is connected to a second driving signal processing unit, and each second driving signal processing unit is used for connecting to a corresponding parallel switch tube assembly in the frequency converter. Specifically, the unit 151 and the unit 152 are respectively connected to the control ends of two switch tubes in the assembly B, and the unit 153 and the unit 154 are respectively connected to the control ends of two switch tubes in the assembly C. The four paths of signals output by the second driving signal processing circuit 150 control the switching tubes in the two corresponding parallel switching tube assemblies to be alternately switched on and off.
In one embodiment, the second driving signal processing circuit 150 further includes a second peak absorbing circuit 155, and a common terminal of the ninth switching tube K8 and the tenth switching tube K9 is connected to the primary winding of the second transformer T2 through the second peak absorbing circuit 155. The stability of the inverter welding power supply driving control device is improved by performing peak absorption through the peak absorption circuit 155. Further, the second peak absorption circuit 155 includes a second absorption resistor R16 and a second absorption capacitor C2, after the second absorption resistor R16 and the second absorption capacitor C2 are connected in parallel, one end of the second absorption resistor R16 is connected to the common end of the ninth switching tube K8 and the tenth switching tube K9, and the other end of the second absorption resistor R2 is connected to the primary winding of the second transformer T2.
In addition, the second driving signal processing circuit 150 may further include a resistor R15, a resistor R17, a resistor R18, a resistor R19, and a resistor R20. An input end of the ninth switching tube K8 and an input end of the eleventh switching tube K10 are connected to the power supply input end through a resistor R15, a control end of the ninth switching tube K8 is connected to the first waveform separation circuit 120 through a resistor R17, and a control end of the tenth switching tube K9 is connected to the first waveform separation circuit 120 through a resistor R18. The control end of the eleventh switch tube K10 is connected to the second waveform separation circuit 130 through a resistor R19, and the control end of the twelfth switch tube K11 is connected to the second waveform separation circuit 130 through a resistor R20.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A driving control device of an inverter welding power supply is characterized by comprising a PWM waveform controller, a first waveform separation circuit, a first driving signal processing circuit, a second waveform separation circuit and a second driving signal processing circuit, wherein a first output end and a second output end of the PWM waveform controller are respectively connected with the first waveform separation circuit and the second waveform separation circuit, the first driving signal processing circuit is connected with the first waveform separation circuit and the second waveform separation circuit and is also used for being connected with corresponding parallel switch tube assemblies in a frequency converter of the inverter welding power supply, the second driving signal processing circuit is connected with the first waveform separation circuit and the second waveform separation circuit and is also used for being connected with corresponding parallel switch tube assemblies in the frequency converter,
a first output end of the PWM waveform controller outputs a first pulse waveform to the first waveform separation circuit and the second waveform separation circuit, a second output end of the PWM waveform controller outputs a second pulse waveform to the first waveform separation circuit and the second waveform separation circuit, and the first pulse waveform and the second pulse waveform have the same frequency and 180-degree phase difference;
the first waveform separation circuit takes the second pulse waveform as a reference signal, filters odd-numbered pulses in the first pulse waveform to obtain a first pulse signal and outputs the first pulse signal to the first driving signal processing circuit, and filters odd-numbered pulses in the second pulse waveform to obtain a second pulse signal and outputs the second pulse signal to the second driving signal processing circuit;
the second waveform separation circuit takes the first pulse waveform as a reference signal, filters out pulses of even times in the first pulse waveform to obtain a third pulse signal and outputs the third pulse signal to the first driving signal processing circuit, and filters out pulses of even times in the second pulse waveform to obtain a fourth pulse signal and outputs the fourth pulse signal to the second driving signal processing circuit;
the first driving signal processing circuit and the second driving signal processing circuit control the switching tubes in the corresponding parallel switching tube assemblies in the frequency converter to be alternately conducted according to the received pulse signals;
the first waveform separation circuit comprises a first D trigger, a first switch tube, a second switch tube, a first diode and a second diode,
the port CLK of the first D trigger is connected with the second output end of the PWM waveform controller, the control end of the first switch tube is connected with the anode of the first diode and the first output end of the PWM waveform controller, the cathode of the first diode is connected with the port Q of the first D trigger, the input end of the first switch tube is connected with the first output end of the PWM waveform controller, and the output end of the first switch tube is connected with the first drive signal processing circuit; the control end of the second switch tube is connected with the anode of the second diode and the second output end of the PWM waveform controller, and the cathode of the second diode is connected with the port D and the port of the first D trigger
The input end of the second switch tube is connected with the second output end of the PWM waveform controller, and the output end of the second switch tube is connected with the second driving signal processing circuit.
2. The inverter welding power supply drive control device of claim 1 wherein the first waveform splitter circuit further comprises a first power amplifier, a second power amplifier, a third power amplifier, and a fourth power amplifier,
the input end of the first power amplifier is connected with the first output end of the PWM waveform controller, the output end of the first power amplifier is connected with the input end of the second power amplifier and the anode of the first diode, and the output end of the second power amplifier is connected with the control end of the first switch tube;
the input end of the third power amplifier is connected with the second output end of the PWM waveform controller, the output end of the third power amplifier is connected with the input end of the fourth power amplifier and the anode of the second diode, and the output end of the fourth power amplifier is connected with the control end of the second switch tube.
3. The inverter welding power supply drive control of claim 1, wherein the second waveform splitter circuit comprises a second D flip-flop, a third switch, a fourth switch, a third diode, and a fourth diode,
the port CLK of the second D trigger is connected with the first output end of the PWM waveform controller, the control end of a third switching tube is connected with the anode of a third diode and the second output end of the PWM waveform controller, the cathode of the third diode is connected with the port Q of the second D trigger, the input end of the third switching tube is connected with the second output end of the PWM waveform controller, and the output end of the third switching tube is connected with the second driving signal processing circuit; the control end of the fourth switch tube is connected with the anode of the fourth diode and the first output end of the PWM waveform controller, the cathode of the fourth diode is connected with the port Q of the second D trigger, the input end of the fourth switch tube is connected with the first output end of the PWM waveform controller, and the output end of the fourth switch tube is connected with the first driving signal processing circuit.
4. The inverter welding power supply drive control device of claim 3, wherein the second waveform splitter circuit further comprises a fifth power amplifier, a sixth power amplifier, a seventh power amplifier, and an eighth power amplifier,
the input end of the fifth power amplifier is connected with the second output end of the PWM waveform controller, the output end of the fifth power amplifier is connected with the input end of the sixth power amplifier and the anode of the third diode, and the output end of the sixth power amplifier is connected with the control end of the third switching tube;
the input end of the seventh power amplifier is connected with the first output end of the PWM waveform controller, the output end of the seventh power amplifier is connected with the input end of the eighth power amplifier and the anode of the fourth diode, and the output end of the eighth power amplifier is connected with the control end of the fourth switching tube.
5. The inverter welding power supply driving control device according to claim 1, wherein the first driving signal processing circuit comprises a fifth switching tube, a sixth switching tube, a seventh switching tube, an eighth switching tube, a first transformer and a first driving signal processing unit, the first transformer comprises a primary winding and four secondary windings, the number of the first driving signal processing units is the same as the number of the secondary windings of the first transformer,
the input end of the fifth switching tube is connected with the power supply access end, the output end of the fifth switching tube is connected with the input end of the sixth switching tube, the output end of the sixth switching tube is grounded, and the control end of the fifth switching tube and the control end of the sixth switching tube are connected with the first waveform separation circuit;
the input end of the seventh switching tube is connected with the power supply access end, the output end of the seventh switching tube is connected with the input end of the eighth switching tube, the output end of the eighth switching tube is grounded, and the control end of the seventh switching tube and the control end of the eighth switching tube are connected with the second waveform separation circuit;
the common end of the fifth switching tube and the sixth switching tube is connected with one end of the primary winding of the first transformer, and the common end of the seventh switching tube and the eighth switching tube is connected with the other end of the primary winding of the first transformer; and each secondary winding of the first transformer is respectively connected with one first driving signal processing unit, and each first driving signal processing unit is used for connecting corresponding parallel switch tube assemblies in the frequency converter.
6. The inverter welding power supply driving control device according to claim 5, wherein the first driving signal processing circuit further comprises a first peak absorption circuit, and a common terminal of the fifth switching tube and the sixth switching tube is connected to the primary winding of the first transformer through the peak absorption circuit.
7. The inverter welding power supply drive control device according to claim 6, wherein the first peak absorption circuit comprises a first absorption resistor and a first absorption capacitor, and after the first absorption resistor and the first absorption capacitor are connected in parallel, one end of the first absorption resistor is connected to a common end of the fifth switching tube and the sixth switching tube, and the other end of the first absorption resistor is connected to the primary winding of the first transformer.
8. The inverter welding power supply driving control device according to claim 1, wherein the second driving signal processing circuit includes a ninth switching tube, a tenth switching tube, an eleventh switching tube, a twelfth switching tube, a second transformer and a second driving signal processing unit, the second transformer includes a primary winding and four secondary windings, the number of the second driving signal processing units is the same as the number of the secondary windings of the second transformer,
the input end of the ninth switching tube is connected with the power supply access end, the output end of the ninth switching tube is connected with the input end of the tenth switching tube, the output end of the tenth switching tube is grounded, and the control end of the ninth switching tube and the control end of the tenth switching tube are connected with the first waveform separation circuit;
the input end of the eleventh switch tube is connected with the power supply access end, the output end of the eleventh switch tube is connected with the input end of the twelfth switch tube, the output end of the twelfth switch tube is grounded, and the control end of the eleventh switch tube and the control end of the twelfth switch tube are connected with the second waveform separation circuit;
the common end of the ninth switching tube and the tenth switching tube is connected with one end of the primary winding of the second transformer, and the common end of the eleventh switching tube and the twelfth switching tube is connected with the other end of the primary winding of the second transformer; and each secondary winding of the second transformer is respectively connected with one second driving signal processing unit, and each second driving signal processing unit is used for connecting corresponding parallel switch tube assemblies in the frequency converter.
9. The inverter welding power supply driving control device according to claim 8, wherein the second driving signal processing circuit further comprises a second peak absorption circuit, and a common terminal of the ninth switching tube and the tenth switching tube is connected to the primary winding of the second transformer through the second peak absorption circuit.
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| CN201611239450.1A CN108258885B (en) | 2016-12-28 | 2016-12-28 | Inverter welding power supply drive control device |
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| CN201611239450.1A CN108258885B (en) | 2016-12-28 | 2016-12-28 | Inverter welding power supply drive control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08266052A (en) * | 1995-03-22 | 1996-10-11 | Shiyoutoku Seisakusho:Kk | Voltage converter |
| CN1241327C (en) * | 2001-04-26 | 2006-02-08 | 中兴通讯股份有限公司 | Circuit for improving reliability of primary power switch device in step-up circuit |
| CN2919680Y (en) * | 2006-04-12 | 2007-07-04 | 瑞谷科技(深圳)有限公司 | Secondary contravariance power tube drive circuit of ringer oscillator |
| EP2460262A1 (en) * | 2009-07-28 | 2012-06-06 | THX Ltd | Power supply |
| JP2015111963A (en) * | 2012-03-30 | 2015-06-18 | 富士電機株式会社 | Power conversion device |
| CN103499732B (en) * | 2013-09-29 | 2016-09-14 | 湘潭大学 | A kind of two-way zero-crossing testing circuit |
| CN203636175U (en) * | 2013-11-26 | 2014-06-11 | 华南理工大学 | STM32 based integral twin-wire pulse MIG welding power supply system |
| CN103817407B (en) * | 2014-03-14 | 2015-07-01 | 上海沪工焊接集团股份有限公司 | Driving circuit |
| CN105099251B (en) * | 2014-05-21 | 2018-11-30 | 济南芯驰能源科技有限公司 | A kind of SPWM two divided-frequency interlocks the medium frequency inverter circuit of drive control |
| CN104052326B (en) * | 2014-06-24 | 2016-08-24 | 胡长建 | A kind of high-power single inversion stud welding machine |
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