CN107707003B - PWM pulse width type constant-current charging type capacitor energy storage welding charging control system - Google Patents
PWM pulse width type constant-current charging type capacitor energy storage welding charging control system Download PDFInfo
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- CN107707003B CN107707003B CN201710803369.XA CN201710803369A CN107707003B CN 107707003 B CN107707003 B CN 107707003B CN 201710803369 A CN201710803369 A CN 201710803369A CN 107707003 B CN107707003 B CN 107707003B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 157
- 238000007600 charging Methods 0.000 title claims abstract description 105
- 238000003466 welding Methods 0.000 title claims abstract description 33
- 238000010277 constant-current charging Methods 0.000 title claims abstract description 12
- 238000004146 energy storage Methods 0.000 title claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 48
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000001914 filtration Methods 0.000 claims abstract description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 52
- 229910052710 silicon Inorganic materials 0.000 claims description 51
- 239000010703 silicon Substances 0.000 claims description 51
- 239000000523 sample Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 2
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 description 9
- 101150105073 SCR1 gene Proteins 0.000 description 9
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 description 9
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 description 4
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 description 4
- 101000668170 Homo sapiens RNA-binding motif, single-stranded-interacting protein 2 Proteins 0.000 description 3
- 102100039690 RNA-binding motif, single-stranded-interacting protein 2 Human genes 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007620 mathematical function Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
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- H02J7/022—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H02J7/027—
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- H02J7/045—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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- H02J2007/10—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
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Abstract
The invention relates to the technical field of welding machines, in particular to a PWM pulse width type constant-current charging type capacitor energy storage welding charging control system which comprises a three-phase charging transformer, a single-phase charging transformer, a rectifying loop, a DC _ LINK filtering loop, a PWM charging control part, a charging current detection part, a welding transformer, a discharging loop, a discharging turn-off circuit, a discharging current detection part, a discharging control part and a capacitor bank, wherein the three-phase charging transformer is connected with the rectifying loop; no matter the input power supply is single-phase or three-phase, the input power supply can be controlled by the same controller, the precision is improved by more than 10 times (in 1000 HZ) compared with the precision of an SCR (selective catalytic reduction) regulation mode by adopting a PWM (pulse width modulation) mode, the charging current is sampled in real time by adopting a Hall current sensor, and the PWM pulse width is adjusted by utilizing the Hall current sensor, so that the constant current control is realized; the charging and discharging utilizes a welding transformer, and the direction of the charging current is opposite to that of the discharging current, so that the transformer can be effectively prevented from being magnetized.
Description
Technical Field
The invention relates to the technical field of welding machines, in particular to a PWM pulse width type constant current charging type capacitor energy storage welding charging control system.
Background
The existing capacitive energy storage type welding machine system adopts a single-phase 220V (or 380V) power supply or a three-phase 380V power supply to charge a capacitor bank, and a current-limiting resistor is generally added to a charging loop. And the single-phase or three-phase charging circuit can only adopt respective control circuit to charge the energy storage capacitor.
The defects are as follows: the current limiting resistor can not be added to a single-phase (220V or 380V) or three-phase (3 phi 380V) capacitive energy storage welding machine, and the purpose of constant current charging of a capacitor bank is achieved by utilizing a loop resistor and an inductor of the current limiting resistor.
Disclosure of Invention
The invention aims to realize current limiting resistance adding and constant current charging of a capacitor bank by using a self loop resistance and an inductance for a single-phase (220V or 380V) or three-phase (3 phi 380V) capacitive energy storage welding machine.
The technical scheme of the invention is as follows:
PWM pulse width formula constant current charging formula electric capacity energy storage welds control system that charges, its characterized in that: the device comprises a three-phase charging transformer, a single-phase charging transformer, a rectifying circuit, a DC _ LINK filtering circuit, a PWM charging control part, a charging current detection part, a welding transformer, a discharging circuit, a discharging turn-off circuit, a discharging current detection part, a discharging control part and a capacitor bank.
The W end, the U end and the V end of a primary coil of the three-phase charging transformer are respectively connected with a first phase, a second phase and a third phase of three-phase power, and two ends of the primary coil of the single-phase charging transformer are respectively connected with a zero line and a live line of single-phase alternating current.
The rectifying loop comprises six diodes, wherein the output ends of a fourth diode, a fifth diode and a sixth diode are respectively connected with the input ends of a first diode, a second diode and a third diode.
The W end, the U end and the V end of a secondary coil of the three-phase charging transformer are respectively connected with the input ends of a first diode, a second diode and a third diode, the zero line end of the secondary coil of the single-phase charging transformer is connected with the input end of the first diode, and the live wire end of the secondary coil of the single-phase charging transformer is connected with the input end of the third diode.
The rectifier circuit is connected with a first capacitor in parallel, the output ends of the first diode, the second diode and the third diode are connected to the first end of the first capacitor, and the input ends of the fourth diode, the fifth diode and the sixth diode are connected to the second end of the first capacitor.
The output of the first diode of rectification return circuit, second diode and third diode all connects the input of DC _ LINK filtering circuit, DC _ LINK filtering circuit includes first resistance and contactor, first resistance and contactor are parallelly connected, DC _ LINK filtering circuit still includes second electric capacity, third electric capacity, second resistance and third resistance, the input of fourth diode, fifth diode and sixth diode is connected to the negative pole of third electric capacity, the negative pole of second electric capacity is connected to the positive pole of third electric capacity, the parallelly connected third resistance of third electric capacity, the parallelly connected second resistance of second electric capacity, the second end of first resistance is connected to the positive pole of second electric capacity.
The second end of the first resistor of the DC _ LINK filtering loop is connected with the PWM charging control part through a first fuse, the PWM charging control part comprises a fourth resistor, a fourth capacitor and a first insulated gate bipolar transistor, the first fuse is connected with the first end of the fourth resistor, the first end of the fourth capacitor is connected with the second end of the fourth resistor, the first end of the fourth resistor is further connected with the C pole of the first insulated gate bipolar transistor, and the E pole of the first insulated gate bipolar transistor is connected with the second end of the fourth capacitor.
The PWM charging control part is connected with a charging current detection part, the charging current detection part is an inductor, a first end of the inductor is connected with a second end of a fourth capacitor, and a second end of the inductor is connected with a first end of a primary coil of the welding transformer.
The second end of the inductor is connected with a discharging loop, the discharging loop comprises a first controlled silicon and a seventh capacitor, the anode of the first controlled silicon is connected with the second end of the inductor, the gate of the first controlled silicon is connected with the first end of the seventh capacitor, the cathode of the first controlled silicon is connected with the second end of the seventh capacitor, the first end and the second end of the seventh capacitor are connected with a plug, and the cathode of the first controlled silicon is connected with the second end of the first capacitor.
The single-phase alternating current is also connected with a discharge turn-off circuit, the discharge turn-off circuit comprises a third transformer, an eighth resistor, a second controlled silicon, an eighth capacitor, a sixth resistor, a tenth capacitor, a second fuse, a third controlled silicon and a ninth capacitor, a live wire and a zero line of the single-phase alternating current are respectively connected with two ends of a primary coil of the third transformer, a live wire end of a secondary coil of the third transformer is connected with a first end of the eighth resistor, a second end of the eighth resistor is connected with an anode of the second controlled silicon, a cathode of the second controlled silicon is respectively connected with a first end of the sixth resistor, an anode of the tenth capacitor, an anode of the third controlled silicon and a second end of the eighth capacitor, a gate of the second controlled silicon is connected with a first end of the eighth capacitor, a second end of the sixth resistor is connected with a zero line end of a secondary coil of the third transformer, a cathode of the tenth capacitor and a first end of the second, the cathode and the gate of the third controllable silicon are respectively connected with the first end and the second end of the ninth capacitor, the second end of the second fuse is connected with the anode of the first controllable silicon of the discharging loop, and the cathode of the third controllable silicon is also connected with the cathode of the first controllable silicon of the discharging loop.
The cathode of the first controlled silicon of the discharge loop is connected with a discharge current detection part, the discharge current detection part is a current probe, the first end of the current probe is connected with the cathode of the first controlled silicon, the second end of the current probe is connected with the capacitor bank and the discharge control part, the capacitor bank comprises a sixth capacitor, a seventh resistor and a seventh diode, the discharge control part comprises a voltage-regulating control circuit board and a ninth resistor, the second end of the current probe is connected with the first end of a seventh resistor, the negative electrode of a sixth capacitor and the first end of the voltage regulation control circuit board respectively, the second end of the seventh resistor is connected with the input end of a seventh diode, the output end of the seventh diode and the second end of the sixth capacitor are connected with the second end of a primary coil of the welding transformer, a ninth resistor is connected between the second end and the third end of the voltage regulation control circuit board, and the third end of the voltage regulation control circuit board is connected with the second end of the sixth capacitor.
The control system further comprises a fourth transformer and a control panel, wherein the zero line end and the fire line end of the single-phase alternating current are respectively connected with the primary coil of the fourth transformer, the secondary coil of the fourth transformer is connected with the control panel, the two ends of the eighth capacitor are connected with the control panel, the two ends of the ninth capacitor are connected with the control panel, the C electrode of the first insulated gate bipolar transistor is connected with the control panel, the G electrode and the E electrode of the first insulated gate bipolar transistor are connected with the control panel by twisted pairs, the current probe is connected with the control panel by a data line, the voltage regulation control circuit board is connected with the control panel by a data line, and the positive electrode and the negative electrode of the sixth capacitor are respectively; and the conducting wires of the eighth capacitor and the ninth capacitor connected with the control board are grounded by adopting shielding wires.
The control system further comprises a second insulated gate bipolar transistor, a fifth resistor and a fifth capacitor, wherein the C electrode of the second insulated gate bipolar transistor is connected with the E electrode of the first insulated gate bipolar transistor, the G electrode and the E electrode of the second insulated gate bipolar transistor are both connected with the second end of the first capacitor, the first end of the fifth resistor is connected with the first end of the inductor, the second end of the fifth resistor is connected with the first end of the fifth capacitor, and the second end of the fifth capacitor is connected with the second end of the first capacitor.
Specifically, the diode in the rectifying circuit is a rectifying diode.
In some embodiments, the rectifying circuit is provided with four rectifying diodes.
In some embodiments, the inductor is a hall current transformer.
The control method of the control system comprises the following steps:
1, increasing the voltage to the voltage required by charging through a three-phase charging transformer or a single-phase charging transformer;
2, forming a rectifying loop by using six (or four) rectifying diodes, converting alternating current into direct current and charging a DC _ LINK filter; during initial charging, because the capacitor bank of the DC _ LINK is in a virtual short circuit state, the seventh resistor is used for current-limiting charging for protecting the capacitor bank, the charging transformer and the rectifying loop;
3, switching on the contactor when the capacitor voltage in the DC _ LINK loop reaches a certain voltage;
4, detecting the closing of the contactor, and starting the charging of a PWM charging control part in the circuit;
5, the PWM charging control part monitors the charging current in real time by using a Hall current transformer in the PWM pulse width modulation process, and adjusts the pulse width of the IGBT by a monitoring value, thereby achieving the purpose of constant current charging;
6, when the capacitor bank reaches a certain range of a preset voltage value, switching the constant-current mode to the constant-voltage mode, and performing charging control in a trickle mode;
7, after the charging voltage reaches a set value, if the welding is in a discharging time sequence, a discharging loop is switched on, and the capacitor bank is discharged through the welding transformer;
8, completing a discharging time sequence, detecting the voltage of the capacitor bank, and utilizing a turn-off loop to turn off the discharging loop;
9, after the above steps are completed, the 4 th step is executed in a circulating way.
The invention has the beneficial effects that: in the prior art, the charging current can be controlled only by half-wave (10ms) control, and the control precision of the invention can reach 0.5ms at least, which is 20 times of that of the prior art; the existing constant current control is related to the power factor of a charging transformer, if the power factor changes, the phase shift angle of a rectifier Silicon Controlled Rectifier (SCR) must be adjusted, and the existing constant current control is related to a plurality of mathematical function relations, so that the work load of a single chip microcomputer is increased, and the current constant current control cannot be finished within a control period, and the real-time control cannot be realized. The invention can realize the constant current effect only by relating to the detected feedback current and utilizing the conversion relation between the feedback current and the PWM duty ratio. The structure form of the main charging transformer is irrelevant; in the energy storage welding in the prior art, the charging capacitor combined transformer is in a parallel connection relationship, the transformer does not participate in charging control, and discharging can be carried out only in a single direction. In this way, the transformer is magnetized. The longer the service life is, the more serious the magnetization of the welding transformer is, and the welding effect is seriously influenced. The invention can effectively eliminate the magnetization of the transformer and can ensure the stability of the welding quality for a long time. In the prior art, the discharge Silicon Controlled Rectifier (SCR) is turned off through a resistance-capacitance oscillating circuit, if the parameters are improperly selected or a device is aged, the discharge Silicon Controlled Rectifier (SCR) is likely to fail to be turned off, a charging loop is caused to be short-circuited, and a charging transformer or a rectifying loop is burnt. The invention adopts an active mode, and adds another group of auxiliary power supplies to apply reverse voltage to the discharge Silicon Controlled Rectifier (SCR), so as to reliably turn off the discharge Silicon Controlled Rectifier (SCR).
The input power supply can be controlled by the same controller no matter whether the input power supply is single-phase or three-phase; the precision is improved by more than 10 times (in 1000 HZ) by adopting a PWM (pulse width modulation) mode compared with an SCR (selective catalytic reduction) regulation mode, and if the modulation frequency is improved, the control precision can be higher; a Hall current sensor is adopted to sample the charging current in real time, and the PWM pulse width is adjusted by using the Hall current sensor, so that constant current control is realized; the charging and discharging are carried out by using a welding transformer, and the directions of the charging current and the discharging current are opposite, so that the transformer can be effectively prevented from being magnetized; the turn-off loop is controlled in an active intervention mode, so that Silicon Controlled Rectifiers (SCR) of the discharge loop are effectively turned off, the main circuit is more effectively protected, and accidents caused by short circuit of the main circuit are prevented.
Drawings
FIG. 1 is a circuit diagram of the present invention;
FIG. 2 is an enlarged view of the left half of the drawing sheet of FIG. 1 in accordance with the present invention;
FIG. 3 is an enlarged view of the right half of the drawing sheet of FIG. 1 according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
example 1
As shown in fig. 1-3, the PWM pulse width type constant current charging control system for capacitor energy storage welding includes a three-phase charging transformer TR1, a single-phase charging transformer TR2, a rectifying circuit, a DC _ LINK filtering circuit, a PWM charging control section, a charging current detection section, a welding transformer w.tr, a discharging circuit, a discharging shutdown circuit, a discharging current detection section, a discharging control section, and a capacitor bank.
The W end, the U end and the V end of a primary coil of the three-phase charging transformer TR1 are respectively connected with a first phase, a second phase and a third phase of three-phase power, and two ends of the primary coil of the single-phase charging transformer TR2 are respectively connected with a zero line and a live line of single-phase alternating current.
The rectifying circuit comprises six diodes, wherein the output ends of a fourth diode D4, a fifth diode D5 and a sixth diode D6 are respectively connected with the input ends of a first diode D1, a second diode D2 and a third diode D3.
The W end, the U end and the V end of a secondary coil of the three-phase charging transformer TR1 are respectively connected with the input ends of a first diode D1, a second diode D2 and a third diode D3, the zero line end of the secondary coil of the single-phase charging transformer TR2 is connected with the input end of a first diode D1, and the live wire end of the secondary coil of the single-phase charging transformer TR2 is connected with the input end of a third diode D3.
The rectifying circuit is connected with a first capacitor C1 in parallel, the output ends of the first diode D1, the second diode D2 and the third diode D3 are all connected to the first end of the first capacitor C1, and the input ends of the fourth diode D4, the fifth diode D5 and the sixth diode D6 are all connected to the second end of the first capacitor C1.
The output end of the rectifying circuit first diode D1, the output end of the second diode D2 and the output end of the third diode D3 are connected with the input end of a DC _ LINK filtering circuit, the DC _ LINK filtering circuit comprises a first resistor R1 and a contactor RYL, the first resistor R1 and the contactor RYL are connected in parallel, the DC _ LINK filtering circuit further comprises a second capacitor C2, a third capacitor C3, a second resistor R2 and a third resistor R3, the negative electrode of the third capacitor C3 is connected with the input ends of a fourth diode D4, a fifth diode D5 and a sixth diode D6, the positive electrode of the third capacitor C3 is connected with the negative electrode of the second capacitor C2, the third capacitor C3 is connected with the third resistor R3 in parallel, the second capacitor C2 is connected with the second resistor R2 in parallel, and the positive electrode of the second capacitor C2 is connected with the second end of the first resistor R1.
The second end of the first resistor R1 of the DC _ LINK filter loop is connected with the PWM charging control part through a first fuse F1, the PWM charging control part comprises a fourth resistor R4, a fourth capacitor C4 and a first insulated gate bipolar transistor IGBT1, the first end of the fourth resistor R4 is connected with the first fuse F1, the second end of the fourth resistor R4 is connected with the first end of the fourth capacitor C4, the first end of the fourth resistor R4 is also connected with the C pole of the first insulated gate bipolar transistor IGBT1, and the E pole of the first insulated gate bipolar transistor IGBT1 is connected with the second end of the fourth capacitor C4.
The PWM charging control part is connected with a charging current detection part, the charging current detection part is an inductor L1, a first end of an inductor L1 is connected with a second end of a fourth capacitor C4, and a second end of an inductor L1 is connected with a first end of a primary coil of a welding transformer W.TR.
The second end of the inductor L1 is connected to a discharge loop, the discharge loop includes a first SCR1 and a seventh capacitor C7, the anode of the first SCR1 is connected to the second end of the inductor L1, the gate of the first SCR1 is connected to the first end of the seventh capacitor C7, the cathode of the first SCR1 is connected to the second end of the seventh capacitor C7, the first and second ends of the seventh capacitor C7 are connected to a plug, and the cathode of the first SCR1 is connected to the second end of the first capacitor C1.
The single-phase alternating current is also connected with a discharge turn-off circuit, the discharge turn-off circuit comprises a third transformer TR3, an eighth resistor R8, a second silicon controlled SCR2, an eighth capacitor C8, a sixth resistor R6, a tenth capacitor C10, a second fuse F2, a third silicon controlled SCR3 and a ninth capacitor C9, the live wire and the zero line of the single-phase alternating current are respectively connected with two ends of the primary coil of the third transformer TR3, the live wire end of the secondary coil of the third transformer TR3 is connected with the first end of the eighth resistor R8, the second end of the eighth resistor R8 is connected with the anode of the second silicon controlled SCR2, the cathode of the second silicon controlled SCR2 is respectively connected with the first end of the sixth resistor R6, the anode of the tenth capacitor C5, the anode of the third silicon controlled SCR 10 823 and the second end of the eighth capacitor C8, the gate of the second silicon controlled SCR2 is connected with the first end of the eighth capacitor C8, and the second end of the sixth resistor R3 is connected with the second end of the zero line of the transformer TR 9, The negative electrode of the tenth capacitor C10 and the first end of the second fuse F2, the cathode and the gate of the third silicon controlled rectifier SCR3 are respectively connected with the first and the second ends of the ninth capacitor C9, the second end of the second fuse F2 is connected with the anode of the first silicon controlled rectifier SCR1 of the discharging loop, and the cathode of the third silicon controlled rectifier SCR3 is also connected with the cathode of the first silicon controlled rectifier SCR1 of the discharging loop.
The cathode of a first silicon controlled rectifier SCR1 of the discharge loop is connected with a discharge current detection part, the discharge current detection part is a current probe CT1, the first end of the current probe CT1 is connected with the cathode of the first silicon controlled rectifier SCR1, the second end of the current probe CT1 is connected with a capacitor bank and a discharge control part, the capacitor bank comprises a sixth capacitor C6, a seventh resistor R7 and a seventh diode D7, the discharge control part comprises a voltage regulation control circuit board and a ninth resistor R9, the second end of the current probe CT1 is respectively connected with the first end of the seventh resistor R7, the cathode of the sixth capacitor C6 and the first end of the voltage regulation control circuit board, the second end of the seventh resistor R7 is connected with the input end of a seventh diode D7, the output end of the seventh diode D7 and the second end of the sixth capacitor C6 are connected with the second end of a primary coil of a welding transformer W.TR, and a ninth resistor R9 is connected between the second end and the third end of the voltage regulation control circuit board, and the third end of the voltage regulating control circuit board is connected with the second end of the sixth capacitor C6.
The control system further comprises a fourth transformer TR4 and a control board, wherein the zero line end and the fire line end of the single-phase alternating current are respectively connected with the primary coil of a fourth transformer TR4, the secondary coil of the fourth transformer TR4 is connected with the control board, the two ends of an eighth capacitor C8 are connected with the control board, the two ends of a ninth capacitor C9 are connected with the control board, the C pole of a first insulated gate bipolar transistor IGBT1 is connected with the control board, the G pole and the E pole of the first insulated gate bipolar transistor IGBT1 are connected with the control board by twisted pairs, the current probe CT1 is connected with the control board by a data line, the voltage regulating control circuit board is connected with the control board by a data line, and the positive pole and the negative pole of a sixth capacitor C6 are respectively; and the conducting wires of the eighth capacitor C8 and the ninth capacitor C9, which are connected with the control board, are grounded by adopting a shielding wire.
The control system further comprises a second insulated gate bipolar transistor IGBT2, a fifth resistor R5 and a fifth capacitor C5, wherein the C electrode of the second insulated gate bipolar transistor IGBT2 is connected with the E electrode of the first insulated gate bipolar transistor IGBT1, the G electrode and the E electrode of the second insulated gate bipolar transistor IGBT2 are both connected with the second end of the first capacitor C1, the first end of the fifth resistor R5 is connected with the first end of the inductor L1, the second end of the fifth resistor R5 is connected with the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is connected with the second end of the first capacitor C1.
And the diode in the rectifying loop is a rectifying diode. The inductor L1 is a hall current transformer.
Example 2
The rectifying loop is provided with four rectifying diodes.
Example 3
The control method of the control system comprises the following steps:
1, increasing the voltage to the voltage required by charging through a three-phase charging transformer or a single-phase charging transformer;
2, forming a rectifying loop by using six (or four) rectifying diodes, converting alternating current into direct current and charging a DC _ LINK filter; during initial charging, because the capacitor bank of the DC _ LINK is in a virtual short circuit state, the seventh resistor is used for current-limiting charging for protecting the capacitor bank, the charging transformer and the rectifying loop;
3, switching on the contactor when the capacitor voltage in the DC _ LINK loop reaches a certain voltage;
4, detecting the closing of the contactor, and starting the charging of a PWM charging control part in the circuit;
5, the PWM charging control part monitors the charging current in real time by using a Hall current transformer in the PWM pulse width modulation process, and adjusts the pulse width of the IGBT by a monitoring value, thereby achieving the purpose of constant current charging;
6, when the capacitor bank reaches a certain range of a preset voltage value, switching the constant-current mode to the constant-voltage mode, and performing charging control in a trickle mode;
7, after the charging voltage reaches a set value, if the welding is in a discharging time sequence, a discharging loop is switched on, and the capacitor bank is discharged through the welding transformer;
8, completing a discharging time sequence, detecting the voltage of the capacitor bank, and utilizing a turn-off loop to turn off the discharging loop;
9, after the above steps are completed, the 4 th step is executed in a circulating way.
The foregoing embodiments and description have been presented only to illustrate the principles and preferred embodiments of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as hereinafter claimed.
Claims (1)
- PWM pulse width type constant current charging type capacitor energy storage welding charging control system is characterized in that: the device comprises a three-phase charging transformer (TR1), a single-phase charging transformer (TR2), a rectifying circuit, a DC _ LINK filtering circuit, a PWM charging control part, a charging current detection part, a welding transformer (W.TR), a discharging circuit, a discharging turn-off circuit, a discharging current detection part, a discharging control part and a capacitor bank; the W end, the U end and the V end of a primary coil of the three-phase charging transformer (TR1) are respectively connected with a first phase, a second phase and a third phase of three-phase power, and two ends of the primary coil of the single-phase charging transformer (TR2) are respectively connected with a zero line and a live line of single-phase alternating current;the rectifying loop comprises six diodes, wherein output ends of a fourth diode (D4), a fifth diode (D5) and a sixth diode (D6) are respectively connected with input ends of a first diode (D1), a second diode (D2) and a third diode (D3);the W end, the U end and the V end of a secondary coil of the three-phase charging transformer (TR1) are respectively connected with the input ends of a first diode (D1), a second diode (D2) and a third diode (D3), the zero line end of the secondary coil of the single-phase charging transformer (TR2) is connected with the input end of a first diode (D1), and the live line end of the secondary coil of the single-phase charging transformer (TR2) is connected with the input end of a third diode (D3);the rectifying circuit is connected with a first capacitor (C1) in parallel, the output ends of the first diode (D1), the second diode (D2) and the third diode (D3) are all connected to the first end of the first capacitor (C1), and the input ends of the fourth diode (D4), the fifth diode (D5) and the sixth diode (D6) are all connected to the second end of the first capacitor (C1);the output ends of the first diode (D1), the second diode (D2) and the third diode (D3) of the rectifying loop are connected with the input end of the DC _ LINK filtering loop, the DC _ LINK filtering loop comprises a first resistor (R1) and a contactor (RYL), the first resistor (R1) is connected with a contactor (RYL) in parallel, the DC _ LINK filtering loop further comprises a second capacitor (C2), a third capacitor (C3), a second resistor (R2) and a third resistor (R3), the cathode of the third capacitor (C3) is connected with the input ends of a fourth diode (D4), a fifth diode (D5) and a sixth diode (D6), the anode of the third capacitor (C3) is connected with the cathode of the second capacitor (C2), the third capacitor (C3) is connected with the third resistor (R3) in parallel, the second capacitor (C2) is connected with the second resistor (R2) in parallel, the anode of the second capacitor (C2) is connected with the second end of the first resistor (R1);a second end of the first resistor (R1) of the DC _ LINK filtering loop is connected with a PWM charging control part through a first fuse (F1), the PWM charging control part comprises a fourth resistor (R4), a fourth capacitor (C4) and a first insulated gate bipolar transistor (IGBT1), a first end of the fourth resistor (R4) is connected with the first fuse (F1), a second end of the fourth resistor (R4) is connected with a first end of the fourth capacitor (C4), a first end of the fourth resistor (R4) is further connected with a C pole of the first insulated gate bipolar transistor (IGBT1), and an E pole of the first insulated gate bipolar transistor (IGBT1) is connected with a second end of the fourth capacitor (C4);the PWM charging control part is connected with a charging current detection part, the charging current detection part is an inductor (L1), a first end of the inductor (L1) is connected with a second end of a fourth capacitor (C4), and a second end of the inductor (L1) is connected with a first end of a primary coil of a welding transformer (W.TR);the second end of the inductor (L1) is connected with a discharging loop, the discharging loop comprises a first silicon controlled rectifier (SCR1) and a seventh capacitor (C7), the anode of the first silicon controlled rectifier (SCR1) is connected with the second end of the inductor (L1), the gate of the first silicon controlled rectifier (SCR1) is connected with the first end of the seventh capacitor (C7), the cathode of the first silicon controlled rectifier (SCR1) is connected with the second end of the seventh capacitor (C7), the first end and the second end of the seventh capacitor (C7) are connected with a plug, and the cathode of the first silicon controlled rectifier (SCR1) is connected with the second end of the first capacitor (C1);the single-phase alternating current is also connected with a discharge turn-off circuit, the discharge turn-off circuit comprises a third transformer (TR3), an eighth resistor (R8), a second controllable silicon (SCR2), an eighth capacitor (C8), a sixth resistor (R6), a tenth capacitor (C10), a second fuse (F2), a third controllable silicon (SCR3) and a ninth capacitor (C9), the live wire and the zero wire of the single-phase alternating current are respectively connected with two ends of the primary coil of the third transformer (TR3), the live wire end of the secondary coil of the third transformer (TR3) is connected with the first end of the eighth resistor (R8), the second end of the eighth resistor (R8) is connected with the anode of the second SCR2), the cathode of the second controllable silicon (SCR2) is respectively connected with the first end of the sixth resistor (R6), the anode of the tenth capacitor (C10), the anode of the third controllable silicon (3) and the second end of the eighth capacitor (C8), the gate of the second silicon controlled rectifier (SCR2) is connected with the first end of the eighth capacitor (C8), the second end of the sixth resistor (R6) is connected with the zero line end of the secondary coil of the third transformer (TR3), the negative electrode of the tenth capacitor (C10) and the first end of the second fuse (F2), the cathode and the gate of the third silicon controlled rectifier (SCR3) are respectively connected with the first and the second ends of the ninth capacitor (C9), the second end of the second fuse (F2) is connected with the anode of the first silicon controlled rectifier (SCR1) of the discharging loop, and the cathode of the third silicon controlled rectifier (SCR3) is also connected with the cathode of the first silicon controlled rectifier (SCR1) of the discharging loop;the cathode of a first silicon controlled rectifier (SCR1) of the discharging loop is connected with a discharging current detection part, the discharging current detection part is a current probe (CT1), the first end of the current probe (CT1) is connected with the cathode of the first silicon controlled rectifier (SCR1), the second end of the current probe (CT1) is connected with a capacitor bank and a discharging control part, the capacitor bank comprises a sixth capacitor (C6), a seventh resistor (R7) and a seventh diode (D7), the discharging control part comprises a voltage regulating control circuit board and a ninth resistor (R9), the second end of the current probe (CT1) is respectively connected with the first end of the seventh resistor (R7), the cathode of the sixth capacitor (C6) and the first end of the voltage regulating control circuit board, the second end of the seventh resistor (R7) is connected with the input end of a seventh diode (D7), the output end of the seventh diode (D7) and the second end of the sixth capacitor (C6) are connected with the second end of a primary coil of a welding transformer (W.TR), a ninth resistor (R9) is connected between the second end and the third end of the voltage-regulating control circuit board, and the third end of the voltage-regulating control circuit board is connected with the second end of a sixth capacitor (C6); the control system further comprises a fourth transformer (TR4) and a control board, wherein the zero line end and the fire line end of the single-phase alternating current are respectively connected with the primary coil of the fourth transformer (TR4), the secondary coil of the fourth transformer (TR4) is connected with the control board, the two ends of the eighth capacitor (C8) are connected with the control board, the two ends of the ninth capacitor (C9) are connected with the control board, the C pole of the first insulated gate bipolar transistor (IGBT1) is connected with the control board, the G pole and the E pole of the first insulated gate bipolar transistor (IGBT1) are connected with the control board by twisted pairs, the current probe (CT1) is connected with the control board by a data line, the voltage regulating control board is connected with the control board by a data line, and the positive pole and the negative pole of the sixth capacitor (C6) are respectively connected with; the conducting wires of the eighth capacitor (C8) and the ninth capacitor (C9) which are connected with the control board are grounded by adopting a shielding wire; the control system further comprises a second insulated gate bipolar transistor (IGBT2), a fifth resistor (R5) and a fifth capacitor (C5), wherein the C pole of the second insulated gate bipolar transistor (IGBT2) is connected with the E pole of the first insulated gate bipolar transistor (IGBT1), the G pole and the E pole of the second insulated gate bipolar transistor (IGBT2) are both connected with the second end of the first capacitor (C1), the first end of the fifth resistor (R5) is connected with the first end of the inductor (L1), the second end of the fifth resistor (R5) is connected with the first end of the fifth capacitor (C5), and the second end of the fifth capacitor (C5) is connected with the second end of the first capacitor (C1); the diode in the rectifying loop is a rectifying diode;the control method of the control system comprises the following steps:1) the voltage is increased to the voltage required by charging through a three-phase charging transformer or a single-phase charging transformer;2) six or four rectifier diodes are used for forming a rectifier circuit, alternating current is converted into direct current, and the direct current is used for charging a DC _ LINK filter; during initial charging, because the capacitor bank of the DC _ LINK is in a virtual short circuit state, the seventh resistor is used for current-limiting charging for protecting the capacitor bank, the charging transformer and the rectifying loop;3) when the capacitor voltage in the DC _ LINK loop reaches a certain voltage, switching on the contactor;4) when the contactor is detected to be switched on, a PWM charging control part in the circuit starts to work after being charged;5) the PWM charging control part monitors the charging current in real time by using a Hall current transformer in the PWM pulse width modulation process, and adjusts the pulse width of the IGBT by a monitoring value, thereby achieving the purpose of constant current charging;6) when the capacitor bank reaches a certain range of a preset voltage value, switching the constant-current mode to the constant-voltage mode, and performing charging control in a trickle mode;7) when the charging voltage reaches a set value, if the welding is in a discharging time sequence, a discharging loop is switched on, and the capacitor bank is discharged through the welding transformer;8) after the discharging time sequence is finished, detecting the voltage of the capacitor bank, and utilizing a turn-off loop to turn off the discharging loop;9) after the above steps are completed, the step 4) is executed in a circulating mode.
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| CN114448036B (en) * | 2022-01-17 | 2022-08-23 | 贵州大学 | resistance-MOSFET (metal oxide semiconductor field effect transistor) regulated and controlled welding power supply capacitor rapid charging method |
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