CN113751832B - Current direction switching circuit, welding machine driving circuit and welding machine equipment - Google Patents
Current direction switching circuit, welding machine driving circuit and welding machine equipment Download PDFInfo
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- CN113751832B CN113751832B CN202110959169.XA CN202110959169A CN113751832B CN 113751832 B CN113751832 B CN 113751832B CN 202110959169 A CN202110959169 A CN 202110959169A CN 113751832 B CN113751832 B CN 113751832B
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- 238000003466 welding Methods 0.000 title claims abstract description 34
- 238000004804 winding Methods 0.000 claims abstract description 57
- 238000010521 absorption reaction Methods 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000004146 energy storage Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 13
- 230000002457 bidirectional effect Effects 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
Abstract
The invention provides a current direction switching circuit, a welding machine driving circuit and welding machine equipment, wherein the current direction switching circuit comprises a full-bridge rectifying circuit, a switching circuit, a control circuit and an absorption circuit, when the current of an output inductor is smaller than a preset current value, the control circuit controls the on or off of each switch of the switching circuit correspondingly, so that a current loop in a first direction formed by a first secondary winding, the first switch and an output end of the current direction switching circuit is switched to a current loop in a second direction formed by a second secondary winding, an output end of the current direction switching circuit and the second switch, bidirectional voltage is provided for a welding machine body, the current loop in each direction only passes through one switch, the power consumption is reduced, and meanwhile, the absorption circuit is used for absorbing energy repeatedly, the energy waste is reduced, and the efficiency of the whole machine is improved.
Description
Technical Field
The invention belongs to the technical field of power supplies, and particularly relates to a current direction switching circuit, a welding machine driving circuit and welding machine equipment.
Background
At present, in the use of a welding machine, bidirectional voltage is needed to be used for some welding, namely, the direction of current output is changed, and because electric equipment in a welding machine body is of resistance characteristics, the output voltage is positive and negative bidirectional voltage, so that the influence of a metal oxide layer on the welding effect in the welding process is reduced.
The traditional switching circuit is to add a secondary inverter circuit consisting of VT 1-VT 4 to perform direction conversion after the primary inverter rectifier bridge, and realize the change of positive and negative polarities according to different opening combinations of VT 1-VT 4. As shown in fig. 1, VT 1-VT 4 operate at low frequency, controlling the polarity of the output; the full bridge of the one-time inversion works at high frequency and controls the output voltage and current.
The working voltage of the secondary inverter circuit is low, the selected switching devices are generally MOS transistors, and the working current is generally larger, so that a plurality of MOS transistors are required to be connected in parallel for use.
When the switching circuit works, the current loop passes through two diagonal semiconductor devices, such as VT1 and VT4, or VT2 or VT3, and the number of the semiconductor devices participating in current transmission is large, so that the power consumption is increased.
Disclosure of Invention
The invention aims to provide a current direction switching circuit, which aims to reduce power consumption generated by the switching circuit.
A first aspect of an embodiment of the present invention provides a current direction switching circuit, where the current direction switching circuit is correspondingly connected to a transformer and an output inductor, the transformer is connected to a full-bridge inverter circuit, and the current direction switching circuit includes:
the input end of the full-bridge rectifier circuit is correspondingly connected with the first end of the first secondary winding of the transformer and the second end of the second secondary winding, wherein the second end of the first secondary winding of the transformer, the first end of the second secondary winding and the first end of the output inductor are commonly connected, and the second end of the output inductor forms the first output end of the current direction switching circuit;
the switching circuit comprises a first switch and a second switch, wherein a first end of the first switch is connected with a first power output end of the full-bridge rectifying circuit, a second end of the first switch and a second end of the second switch are connected together to form a second output end of the current direction switching circuit, and a first end of the second switch is connected with a second power output end of the full-bridge rectifying circuit;
the control circuit is correspondingly connected with the full-bridge inverter circuit and the switching circuit respectively, and triggers and controls each switch in the switching circuit to be correspondingly turned on and off when the current of the output inductor is smaller than a preset current value so as to switch the current direction of the output inductor, wherein the first switch and the second switch are in a mutually turned-on state and a mutually turned-off state before switching;
and the absorption circuit is respectively connected with the first end of the output inductor and the second end of the first switch, and is used for absorbing the energy of the output inductor in the current switching process.
In one embodiment, the control circuit is specifically configured to:
when the voltage between the first output end and the second output end of the current direction switching circuit is negative and the current of the output inductor is smaller than a preset current value, controlling the second switch to be turned on and controlling the first switch to be turned off; or alternatively
And when the voltage between the first output end and the second output end of the current direction switching circuit is positive and the current of the output inductor is smaller than a preset current value, controlling the first switch to be turned on and controlling the second switch to be turned off.
In one embodiment, the control circuit triggers the current direction switching operation when the current of the output inductor is smaller than a preset current value and the full-bridge inverter circuit is operated in a freewheel state.
In one embodiment, the absorption circuit includes:
the input end of the unidirectional conduction circuit is respectively connected with the first end of the output inductor and the second end of the first switch, and is used for unidirectional access of the current of the output inductor in the current direction switching process;
and the energy storage circuit is connected with the output end of the unidirectional conduction circuit and is used for storing the current of the output inductor in the current direction switching process.
In one embodiment, the unidirectional conduction circuit includes a rectifier bridge.
In one embodiment, the tank circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a first electronic switching tube and a zener diode;
the first end of the first capacitor, the first end of the second resistor and the positive power supply output end of the rectifier bridge are connected, the second end of the first capacitor, the first end of the first resistor, the first end of the first electronic switching tube and the first end of the third resistor are connected in a sharing mode, the second end of the second resistor, the second end of the third resistor, the first end of the second capacitor, the cathode of the zener diode and the controlled end of the first electronic switching tube are connected in a sharing mode, and the second end of the first resistor, the second end of the second capacitor, the anode of the zener diode, the negative power supply output end of the rectifier bridge and the second end of the first electronic switching tube are connected in a sharing mode.
In one embodiment, the current direction switching circuit further includes:
and the energy transfer circuit is connected with the energy storage circuit, the control circuit and the electric equipment in the welding machine body and is used for being controlled to be conducted and releasing the energy of the energy storage circuit to the electric equipment in the welding machine body when the voltage of the energy storage circuit is larger than a preset value.
In one embodiment, the energy transfer circuit includes a fourth resistor, a fifth resistor, and a second electronic switching tube;
the first end of the fourth resistor, the first end of the second electronic switch tube and the positive power supply output end of the rectifier bridge are connected, the second end of the fourth resistor, the first end of the fifth resistor and the signal end of the control circuit are connected, the signal end of the control circuit is connected with the controlled end of the second electronic switch tube, the second end of the second electronic switch tube is connected with the power supply end of the electric equipment in the welding machine body, and the second end of the fifth resistor is grounded.
The second aspect of the embodiment of the invention provides a welding machine driving circuit, which comprises a full-bridge inverter circuit, a transformer, an output inductor and the current direction switching circuit, wherein the full-bridge inverter circuit, the transformer and the output inductor are sequentially connected, and the current direction switching circuit is correspondingly connected with the transformer.
A third aspect of an embodiment of the present invention provides a welder apparatus comprising a welder body and a welder driving circuit as described above.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: the full-bridge rectifier circuit, the switching circuit, the control circuit and the absorption circuit are adopted to form a current direction switching circuit, when the current of the output inductor is smaller than a preset current value, the control circuit controls the switches of the switching circuit to be correspondingly turned on or turned off, so that a current loop in a first direction formed by the first secondary winding, the first switch and the output end of the current direction switching circuit is switched to a current loop in a second direction formed by the second secondary winding, the output end of the current direction switching circuit and the second switch, bidirectional voltage is provided for the welding machine body, the current loop in each direction only passes through one switch, the power consumption is reduced, and meanwhile, the absorption circuit is used for absorbing energy, the energy can be repeatedly utilized, the energy waste is reduced, and the efficiency of the whole welding machine is improved.
Drawings
FIG. 1 is a schematic diagram of a conventional switching circuit;
fig. 2 is a schematic diagram of a first circuit structure of a current direction switching circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a second circuit structure of the current direction switching circuit according to the embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
A first aspect of an embodiment of the present invention provides a current direction switching circuit.
As shown in fig. 2, the current direction switching circuit is correspondingly connected with a transformer T1 and an output inductor L1, the transformer T1 is connected with a full-bridge inverter circuit 200, the full-bridge inverter circuit 200 includes four electronic switching transistors for inverting and converting an input dc power supply into a high-voltage ac power supply, the transformer T1 includes a primary winding, a first secondary winding and a second secondary winding, the transformer T1 is used for down-converting the high-voltage ac power supply into a low-voltage ac power supply, wherein a second end of the first secondary winding, a first end of the second secondary winding and a first end of the output inductor L1 of the transformer T1 are commonly connected, a second end of the output inductor L1 forms a first output end of the current direction switching circuit, and the current direction switching circuit and the output inductor L1 are used for connecting a welder body to realize bidirectional current output.
In order to achieve current direction switching, a current direction switching circuit includes:
the input end of the full-bridge rectifier circuit 10 is correspondingly connected with the first end of the first secondary winding and the second end of the second secondary winding of the transformer T1, wherein the second end of the first secondary winding of the transformer T1, the first end of the second secondary winding and the first end of the output inductor L1 are commonly connected, and the second end of the output inductor L1 forms a first output end of the current direction switching circuit;
the switching circuit comprises a first switch S1 and a second switch S2, wherein a first end of the first switch S1 is connected with a first power supply output end of the full-bridge rectifying circuit 10, a second end of the first switch S1 and a second end of the second switch S2 are connected together to form a second output end of the current direction switching circuit, and a first end of the second switch S2 is connected with a second power supply output end of the full-bridge rectifying circuit 10;
the control circuit is correspondingly connected with the full-bridge inverter circuit and the switch circuit respectively, and triggers and controls the corresponding on and off of each switch in the switch circuit when the current of the inductor is smaller than a preset current value so as to switch the current direction of the inductor, wherein the first switch S1 and the second switch S2 are in an on state and an off state before switching;
and the absorption circuit 20 is respectively connected with the first end of the output inductor L1 and the second end of the first switch S1, and the absorption circuit 20 is used for absorbing the energy of the inductor in the current switching process.
In this embodiment, the first switch S1 and the second switch S2 are commonly connected and cooperate with the output inductor L1 to form a power output end of the current direction switching circuit 100, where the first switch S1 and the second switch S2 are used to implement a current direction of the output inductor L1, so as to change a polarity of an operating voltage of the welder body, and in a normal operating state, the first switch S1 and the second switch S2 are in an on-off state, i.e. when the first open tube is turned on, the second switch S2 is turned off.
When the first switch S1 is turned on, the first secondary winding, the upper bridge arm of the full-bridge rectifier circuit 10, the first switch S1, the power output terminal of the current direction switching circuit 100, and the output inductor L1 form a current loop in a first direction, the voltage difference between the first power output terminal and the second power output terminal of the current direction switching circuit 100 is negative, and when the second switch S2 is turned on, the second secondary winding, the output inductor L1, the power output terminal of the current direction switching circuit 100, and the second switch S2 form a current loop in a second direction, and the voltage difference between the first power output terminal and the second power output terminal of the current direction switching circuit 100 is positive.
The polarity change depends on the switching state switching of the first switch S1 and the second switch S2, and is triggered when the current of the output inductor L1, namely the output current of the current direction switching circuit 100, is smaller than a preset current value, so that the current direction switching is completed in one period, the control circuit monitors the current of the output inductor L1 in real time, and controls the corresponding on and off of each switch under a set condition, so that the current loop in the first direction is switched to the current loop in the second direction, bidirectional voltage is provided for the welding machine body, and meanwhile, the absorption circuit 20 absorbs energy in the current switching process, so that energy is prevented from accumulating in the output inductor L1, and by arranging the absorption circuit 20, the power resistance for consuming capacitor voltage is omitted, the conversion efficiency is improved, the repeated utilization of energy can be realized, the energy waste is reduced, and the efficiency of the whole machine is improved.
The current loop in each direction only passes through one switch, so that the power consumption is reduced, meanwhile, different switch structures, such as a plurality of MOS (metal oxide semiconductor) tubes connected in parallel, can be adopted by each switch according to the working current, and the specific structure is not limited.
In one embodiment, the control circuit is specifically configured to:
when the voltage between the first output end and the second output end of the current direction switching circuit is negative and the current of the inductor is smaller than a preset current value, controlling the second switch S2 to be turned on and controlling the first switch S1 to be turned off; or alternatively
When the voltage between the first output end and the second output end of the current direction switching circuit is positive and the current of the output inductor L1 is smaller than a preset current value, the first switch S1 is controlled to be turned on and the second switch S2 is controlled to be turned off.
Specifically, in one embodiment, the control circuit is specifically configured to:
when the voltage between the first output end and the second output end of the current direction switching circuit is negative and the current of the output inductor L1 is smaller than a preset current value, controlling the second switch S2 to be turned on and controlling the first switch S1 to be turned off; or alternatively
When the voltage between the first output end and the second output end of the current direction switching circuit is positive and the current of the output inductor L1 is smaller than a preset current value, the first switch S1 is controlled to be turned on and the second switch S2 is controlled to be turned off.
Assuming that the first switch S1 is turned on and the second switch S2 is turned off before the current direction is switched, the upper bridge arm of the full-bridge rectifier circuit 10 is in an operating state, the voltage difference between the first power output end and the second power output end of the current direction switching circuit 100 is negative, and when the current of the output inductor L1 is detected to be smaller than the preset current value, the control circuit triggers the current switching operation, and meanwhile, in order to avoid that the secondary side current affects the operating states of the switches of the full-bridge inverter circuit 200 in the switching process and reduce the power consumption, the switching operation occurs in the freewheeling state of the full-bridge inverter circuit 200, that is, when the electronic switching tubes of the full-bridge inverter circuit 200 are in the off state.
When the switching starts, the second switch S2 is turned on, because the current of the primary winding is zero, the first secondary winding and the second secondary winding divide equally the current of the output inductor L1, and because the lower bridge arm connected with the second secondary winding exists, no current passes through the second switch S2.
After the second switch S2 is turned on, the first switch S1 is controlled to be turned off, because the lower bridge arm of the full-bridge rectifier circuit 10 is blocked in the opposite direction, the current of the output inductor L1 flows into the absorption circuit 20, the current of the output inductor L1 is rapidly reduced under the voltage of the absorption circuit 20, because the output inductor L1 is larger, the current does not suddenly drop to zero, and because the voltage of the absorption circuit 20 is greater than the voltage of the second secondary winding, the lower bridge arm connected with the second secondary winding is not turned on, at this time, the transformer is in an equivalent open circuit state, and the voltage of the primary winding charges the excitation output inductor L1 of the transformer.
When the current of the output inductor L1 decreases to a level where the arc cannot be maintained, the arc is extinguished, the output inductor L1 releases energy and starts an arc due to the open circuit, the energy of the output inductor L1 is released, the current of the output inductor L1 is further reduced to zero, the absorption circuit 20 does not absorb energy any more, the secondary winding of the transformer starts to act on the output inductor L1, the current of the output inductor L1 becomes negative and continuously decreases, i.e. the current of the output inductor L1 is reversed and continuously increases, and the current commutation is completed.
Or, before the current direction is switched, the second switch S2 is turned on, the first switch S1 is turned off, the lower bridge arm of the full-bridge rectifier circuit 10 is in an operating state, the voltage difference between the first power output end and the second power output end of the current direction switching circuit 100 is positive, when the current of the output inductor L1 is detected to be smaller than the preset current value, the control circuit triggers the current switching operation, and meanwhile, in order to avoid that the secondary side current affects the operating states of the switches of the full-bridge inverter circuit 200 in the switching process, and reduce the power consumption, the switching operation occurs in the freewheeling state of the full-bridge inverter circuit 200, that is, when the electronic switching tubes of the full-bridge inverter circuit 200 are in the off state.
When the switching starts, the first switch S1 is turned on, because the current of the primary winding is zero, the first secondary winding and the second secondary winding divide the current of the output inductor L1 equally, and because the upper bridge arm connected with the first secondary winding exists, no current passes through the first switch S1.
After the first switch S1 is turned on, the second switch S2 is controlled to be turned off, because the upper bridge arm of the full-bridge rectifier circuit 10 is blocked in the opposite direction, the current of the output inductor L1 flows into the absorption circuit 20, the current of the output inductor L1 is rapidly reduced under the voltage of the absorption circuit 20, because the output inductor L1 is larger, the current does not suddenly drop to zero, and because the voltage of the absorption circuit 20 is greater than the voltage of the second secondary winding, the upper bridge arm connected with the first secondary winding is not turned on, at this time, the transformer is in an equivalent open circuit state, and the voltage of the primary winding charges the excitation output inductor L1 of the transformer.
When the current of the output inductor L1 decreases to a level where the arc cannot be maintained, the arc is extinguished, the output inductor L1 releases energy and starts an arc due to the open circuit, the energy of the output inductor L1 is released, the current of the output inductor L1 is further reduced to zero, the absorption circuit 20 does not absorb energy any more, the secondary winding of the transformer starts to act on the output inductor L1, the current of the output inductor L1 becomes positive and continuously increases, namely, the current of the output inductor L1 is reversed and continuously increases, and the current commutation is completed.
In order to prevent the primary winding from directly transmitting energy to the snubber circuit 20, the set voltage value of the snubber circuit 20 is greater than the voltages of the first and second secondary windings.
Meanwhile, each switch in the switching circuit can be correspondingly provided with different types of switching devices, such as a triode, a relay and the like, according to the power consumption requirement, and the switching circuit is not particularly limited.
Wherein the snubber circuit 20 may employ a lossless circuit such as a capacitor, an inductor, etc., as shown in fig. 3, in one embodiment, the snubber circuit 20 includes:
the unidirectional conduction circuit 21, the input end of the unidirectional conduction circuit 21 is connected with the first end of the output inductor L1 and the second end of the first switch S1 respectively, and is used for unidirectional access of the current of the output inductor L1 in the current direction switching process;
the energy storage circuit 22 is connected with the output end of the unidirectional conduction circuit 21 and is used for storing the current of the output inductor L1 in the current direction switching process.
The unidirectional conduction circuit 21 is used for realizing unidirectional current output of the output inductor L1, preventing current of the absorption circuit 20 from flowing backward, and the energy storage circuit 22 is used for storing energy.
The specific structures of the unidirectional conducting circuit 21 and the tank circuit 22 may be correspondingly set according to requirements, and in one embodiment, the unidirectional conducting circuit 21 includes a rectifier bridge, and the rectifier bridge includes a first upper bridge arm D5, a second upper bridge arm D6, a first lower bridge arm D7, and a second lower bridge arm D8.
The energy storage circuit 22 includes a first capacitor C2, a second capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, a first electronic switching tube S3, and a zener diode D9;
the first end of the first capacitor C2, the first end of the second resistor R2 and the positive power supply output end of the rectifier bridge are connected, the second end of the first capacitor C2, the first end of the first resistor R1, the first end of the first electronic switching tube S3 and the first end of the third resistor R3 are connected together, the second end of the second resistor R2, the second end of the third resistor R3, the first end of the second capacitor C3, the cathode of the zener diode D9 and the controlled end of the first electronic switching tube S3 are connected together, and the second end of the first resistor R1, the second end of the second capacitor C3, the anode of the zener diode D9, the negative power supply output end of the rectifier bridge and the second end of the first electronic switching tube S3 are connected together.
The first capacitor C2 is used for storing energy, the first resistor R1 and the first electronic switching tube S3 are used for realizing slow start, avoiding voltage spikes caused to the primary winding and the secondary winding of the transformer, when the voltage of the first capacitor C2 rises to a preset value, the first electronic switching tube S3 is turned on and short-circuits the first resistor R1, so that the energy storage speed of the first capacitor C2 is increased, meanwhile, the zener diode D9 is used for preventing the gate voltage of the first electronic switching tube S3 from being too large, and meanwhile, the function that the terminal voltage of the first capacitor C2 is larger than the voltages of the first secondary winding and the second secondary winding is realized, and the primary winding is prevented from directly transmitting energy to the absorption circuit 20, wherein the first electronic switching tube S3 can adopt an NMOS tube or an NPN triode, and in one embodiment, the first electronic switching tube S3 is an NMOS tube.
Further, to avoid the occurrence of a fault caused by the excessive energy of the tank circuit 22 and to ensure the full utilization of the energy, please continue to refer to fig. 3, in one embodiment, the current direction switching circuit further includes:
the energy transfer circuit 23 is connected with the energy storage circuit 22, the control circuit and the electric equipment in the welder body and is used for being controlled to be conducted and releasing the energy of the energy storage circuit 22 to the electric equipment in the welder body when the voltage of the energy storage circuit 22 is larger than a preset value, so that energy waste is reduced, and the efficiency of the whole welder is improved.
In one embodiment, as shown in fig. 3, the energy transfer circuit 23 includes an energy transfer circuit 23 including a fourth resistor R4, a fifth resistor R5, and a second electronic switching tube S4;
the first end of the fourth resistor R4 and the first end of the second electronic switch tube S4 are connected with the positive power supply output end of the rectifier bridge, the second end of the fourth resistor R4 and the first end of the fifth resistor R5 are connected with the signal end of the control circuit, the signal end of the control circuit is connected with the controlled end of the second electronic switch tube S4, the second end of the second electronic switch tube S4 is connected with the power supply end of the electric equipment in the welding machine body, and the second end of the fifth resistor R5 is grounded.
In this embodiment, the absorption circuit 20 guides the current of the output inductor L1 into the energy storage circuit 22 through the rectifier bridge, and the control circuit correspondingly controls the second electronic switching tube S4 to be turned on or off according to the voltage division value and the preset voltage value of the fourth resistor R4 and the fifth resistor R5, so that energy is released when the terminal voltage of the energy storage circuit 22 reaches a certain value and is transmitted to the electric equipment in the welder body, energy waste is reduced, and overall efficiency is improved.
In one embodiment, the full bridge rectifier circuit 10 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4;
the first end of the first diode D1, the first end of the third diode D3 and the first end of the first secondary winding are commonly connected, the first end of the second diode D2, the first end of the fourth diode D4 and the second end of the second secondary winding are commonly connected, the second end of the first diode D1, the second end of the second diode D2 and the first end of the first switch S1 are commonly connected, and the second end of the third diode D3, the second end of the fourth diode D4 and the first end of the second switch S2 are commonly connected.
The full-bridge inverter circuit 200 includes electronic switching tubes Q1, Q2, Q3, and Q4 that constitute symmetrical bridge arms.
According to the illustration in fig. 3, the current direction switching circuit has few high-power devices, and a radiator with smaller size can be used, so that the whole size and cost of the welding machine are reduced.
The invention also provides a welder driving circuit, which comprises a full-bridge inverter circuit 200, a transformer T1, an output inductor L1 and a current direction switching circuit, wherein the specific structure of the current direction switching circuit refers to the embodiment, and the welder driving circuit adopts all the technical schemes of all the embodiments, so that the welder driving circuit at least has all the beneficial effects brought by the technical schemes of the embodiments, and is not repeated herein. The full-bridge inverter circuit 200, the transformer T1, and the output inductor L1 are sequentially connected, and the current direction switching circuit is correspondingly connected to the transformer T1.
In this embodiment, the current direction switching circuit is correspondingly connected with the transformer T1 and the output inductor L1, the transformer T1 is connected with the full-bridge inverter circuit 200, the full-bridge inverter circuit 200 includes four electronic switching transistors for inverting the input dc power to the high-voltage ac power, the transformer T1 includes a primary winding, a first secondary winding and a second secondary winding, the transformer T1 is used for down-converting the high-voltage ac power to the low-voltage ac power, wherein the second end of the first secondary winding, the first end of the second secondary winding and the first end of the output inductor L1 of the transformer T1 are commonly connected, the second end of the output inductor L1 forms a first output end of the current direction switching circuit, and the current direction switching circuit and the output inductor L1 are used for connecting the welder body to realize bidirectional current output.
The invention also provides a welding machine device, which comprises a welding machine body and a welding machine driving circuit, wherein the specific structure of the welding machine driving circuit refers to the embodiment, and as the welding machine device adopts all the technical schemes of all the embodiments, the welding machine device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a current direction switching circuit, current direction switching circuit corresponds with transformer and output inductance and is connected, the transformer is connected with full-bridge inverter circuit, its characterized in that, current direction switching circuit with output inductance is used for connecting the welding machine body and realizes two-way current output, the transformer is used for converting high voltage ac power supply down into low voltage ac power supply, current direction switching circuit includes:
the input end of the full-bridge rectifier circuit is correspondingly connected with the first end of the first secondary winding of the transformer and the second end of the second secondary winding, wherein the second end of the first secondary winding of the transformer, the first end of the second secondary winding and the first end of the output inductor are commonly connected, and the second end of the output inductor forms the first output end of the current direction switching circuit;
the switching circuit comprises a first switch and a second switch, wherein a first end of the first switch is connected with a first power output end of the full-bridge rectifying circuit, a second end of the first switch and a second end of the second switch are connected together to form a second output end of the current direction switching circuit, a first end of the second switch is connected with a second power output end of the full-bridge rectifying circuit, and the full-bridge rectifying circuit comprises a first diode, a second diode, a third diode and a fourth diode;
the first end of the first diode, the first end of the third diode and the first end of the first secondary winding are commonly connected, the first end of the second diode, the first end of the fourth diode and the second end of the second secondary winding are commonly connected, the second end of the first diode, the second end of the second diode and the first end of the first switch are commonly connected, and the second end of the third diode, the second end of the fourth diode and the first end of the second switch are commonly connected;
the control circuit is correspondingly connected with the full-bridge inverter circuit and the switching circuit respectively, and triggers and controls each switch in the switching circuit to be correspondingly turned on and off when the current of the output inductor is smaller than a preset current value so as to switch the current direction of the output inductor, wherein the first switch and the second switch are in a mutually turned-on state and a mutually turned-off state before switching;
the absorption circuit is respectively connected with the first end of the output inductor and the second end of the first switch and is used for absorbing energy of the output inductor in the current switching process;
when the first switch is turned on, the first secondary winding, an upper bridge arm of the full-bridge rectifying circuit, the first switch, a power output end of the current direction switching circuit and the output inductor form a current loop in a first direction;
when the second switch is turned on, the second secondary winding, the output inductor, the power output end of the current direction switching circuit and the second switch form a current loop in a second direction.
2. The current direction switching circuit according to claim 1, wherein the control circuit is specifically configured to:
when the voltage between the first output end and the second output end of the current direction switching circuit is negative and the current of the output inductor is smaller than a preset current value, controlling the second switch to be turned on and controlling the first switch to be turned off; or alternatively
And when the voltage between the first output end and the second output end of the current direction switching circuit is positive and the current of the output inductor is smaller than a preset current value, controlling the first switch to be turned on and controlling the second switch to be turned off.
3. The current direction switching circuit according to claim 2, wherein the control circuit triggers the current direction switching operation when the current of the output inductor is smaller than a preset current value and the full-bridge inverter circuit operates in a freewheel state.
4. A current direction switching circuit according to any one of claims 1 to 3, wherein said snubber circuit includes:
the input end of the unidirectional conduction circuit is respectively connected with the first end of the output inductor and the second end of the first switch, and is used for unidirectional access of the current of the output inductor in the current direction switching process;
and the energy storage circuit is connected with the output end of the unidirectional conduction circuit and is used for storing the current of the output inductor in the current direction switching process.
5. The current-direction switching circuit of claim 4 wherein said unidirectional-conduction circuit comprises a rectifier bridge.
6. The current direction switching circuit of claim 5 wherein the tank circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a first electronic switching tube, and a zener diode;
the first end of the first capacitor, the first end of the second resistor and the positive power supply output end of the rectifier bridge are connected, the second end of the first capacitor, the first end of the first resistor, the first end of the first electronic switching tube and the first end of the third resistor are connected in a sharing mode, the second end of the second resistor, the second end of the third resistor, the first end of the second capacitor, the cathode of the zener diode and the controlled end of the first electronic switching tube are connected in a sharing mode, and the second end of the first resistor, the second end of the second capacitor, the anode of the zener diode, the negative power supply output end of the rectifier bridge and the second end of the first electronic switching tube are connected in a sharing mode.
7. The current direction switching circuit of claim 5, wherein the current direction switching circuit further comprises:
and the energy transfer circuit is connected with the energy storage circuit, the control circuit and the electric equipment in the welding machine body and is used for being controlled to be conducted and releasing the energy of the energy storage circuit to the electric equipment in the welding machine body when the voltage of the energy storage circuit is larger than a preset value.
8. The current direction switching circuit of claim 7 wherein said energy transfer circuit comprises a fourth resistor, a fifth resistor, and a second electronic switching tube;
the first end of the fourth resistor, the first end of the second electronic switch tube and the positive power supply output end of the rectifier bridge are connected, the second end of the fourth resistor, the first end of the fifth resistor and the signal end of the control circuit are connected, the signal end of the control circuit is connected with the controlled end of the second electronic switch tube, the second end of the second electronic switch tube is connected with the power supply end of the electric equipment in the welding machine body, and the second end of the fifth resistor is grounded.
9. A welding machine driving circuit, which is characterized by comprising a full-bridge inverter circuit, a transformer, an output inductor and the current direction switching circuit according to any one of claims 1-8, wherein the full-bridge inverter circuit, the transformer and the output inductor are sequentially connected, and the current direction switching circuit is correspondingly connected with the transformer.
10. A welder apparatus comprising a welder body and the welder driving circuit of claim 9.
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| CN202110959169.XA CN113751832B (en) | 2021-08-20 | 2021-08-20 | Current direction switching circuit, welding machine driving circuit and welding machine equipment |
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