CN113751832A - 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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- CN113751832A CN113751832A CN202110959169.XA CN202110959169A CN113751832A CN 113751832 A CN113751832 A CN 113751832A CN 202110959169 A CN202110959169 A CN 202110959169A CN 113751832 A CN113751832 A CN 113751832A
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- 238000003466 welding Methods 0.000 title claims abstract description 31
- 238000004804 winding Methods 0.000 claims abstract description 54
- 238000010521 absorption reaction Methods 0.000 claims abstract description 28
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000004146 energy storage Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 13
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000002457 bidirectional effect Effects 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 5
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- 239000004065 semiconductor Substances 0.000 description 3
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- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
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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
- B23K9/1006—Power supply
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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
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
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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 rectification circuit, a switch circuit, a control circuit and an absorption circuit, the control circuit controls each switch of the switch circuit to be correspondingly switched on or off when the current of an output inductor is smaller than a preset current value, a first-direction current loop formed by a first secondary winding, the first switch and the output end of the current direction switching circuit is switched to a second-direction current loop formed by a second secondary winding, the output end of the current direction switching circuit and the second switch, thereby providing bidirectional voltage for the welding machine body, the current loop in each direction only passes through one switch, reducing the power consumption, meanwhile, energy is absorbed through the absorption circuit, so that energy can be recycled, 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, when a welding machine is used, bidirectional voltage is needed for some welding, namely, the direction of current output is changed, and because electric equipment in the welding machine body has 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 adds a secondary inverter circuit consisting of VT 1-VT 4 after a primary inverter rectifier bridge to carry out direction conversion, and realizes the change of the positive and negative output polarities according to different opening combinations of VT 1-VT 4. As shown in fig. 1, VT 1-VT 4 work at low frequency to control the polarity of output; the primary inverted full bridge works at high frequency to control the output voltage and current.
The working voltage of the secondary inverter circuit is low, the selected switching devices are generally MOS tubes, and the working current is generally larger, so that a plurality of MOS tubes are required to be connected in parallel for use.
When the switching circuit works, a 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 larger, so that the power consumption is increased.
Disclosure of Invention
The invention aims to provide a current direction switching circuit, aiming at reducing the 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 rectifying circuit is correspondingly connected with the first end of the first secondary winding and the second end of the second secondary winding of the transformer, 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 of the transformer are connected in common, and the second end of the output inductor forms the first output end of the current direction switching circuit;
the switch circuit comprises a first switch and a second switch, wherein the first end of the first switch is connected with the first power supply output end of the full-bridge rectification circuit, the second end of the first switch and the second end of the second switch are connected together to form the second output end of the current direction switching circuit, and the first end of the second switch is connected with the second power supply output end of the full-bridge rectification circuit;
the control circuit is correspondingly connected with the full-bridge inverter circuit and the switch circuit respectively, and triggers and controls the corresponding connection and disconnection of each switch in the switch circuit 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 mutual connection state and a disconnection 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 switched on and controlling the first switch to be switched off; or
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 switched on and controlling the second switch to be switched 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 operates in a follow current 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 unidirectionally accessing 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 conducting circuit comprises a rectifier bridge.
In one embodiment, the energy storage circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a first electronic switching tube and a voltage stabilizing diode;
the first end of the first capacitor, the first end of the second resistor and the positive power 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 common, 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 voltage stabilizing diode and the controlled end of the first electronic switching tube are connected in common, and the second end of the first resistor, the second end of the second capacitor, the anode of the voltage stabilizing diode, the negative power output end of the rectifier bridge and the second end of the first electronic switching tube are connected in common.
In one embodiment, 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 when the voltage of the energy storage circuit is greater than a preset value and releasing the energy of the energy storage circuit to the electric equipment in the welding machine body.
In one embodiment, the energy transfer circuit comprises a fourth resistor, a fifth resistor and a second electronic switch tube;
the first end of the fourth resistor and the first end of the second electronic switching tube are connected with the positive power output end of the rectifier bridge, the second end of the fourth resistor and the first end of the fifth resistor 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 switching tube, the second end of the second electronic switching 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 embodiments of the present invention provides welder apparatus comprising a welder body and a welder drive circuit as described above.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: by adopting the full-bridge rectification circuit, the switch circuit, the current direction switching circuit is formed by the control circuit and the absorption circuit, when the current of the output inductor is smaller than a preset current value, the control circuit controls the corresponding connection or disconnection of each switch of the switch circuit, the current loop in the first direction formed by the output end of the first secondary winding, the first switch and the current direction switching circuit is switched to the current loop in the second direction formed by the output end of the second secondary winding, the output end of the current direction switching circuit and the second switch, thereby providing bidirectional voltage for the welding machine body, the current loop in each direction only passes through one switch, the power consumption is reduced, meanwhile, the energy absorption is carried out through the absorption circuit, the energy recycling can be realized, the energy waste is reduced, and the overall efficiency is improved.
Drawings
FIG. 1 is a schematic circuit diagram of a conventional switching circuit;
fig. 2 is a schematic circuit 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 circuit diagram of a second circuit structure of the current direction switching circuit according to the embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present 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 merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically 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 to a transformer T1 and an output inductor L1, a transformer T1 is connected to a full bridge inverter circuit 200, the full bridge inverter circuit 200 includes four electronic switching tubes for inverting and converting an input dc power into a high-voltage ac power, a transformer T1 includes a primary winding, a first secondary winding and a second secondary winding, and a transformer T1 is configured to step down and convert the high-voltage ac power into a low-voltage ac power, wherein a second end of the first secondary winding, a first end of the second secondary winding, and a first end of an output inductor L1 of the transformer T1 are connected in common, 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 configured to connect to a welding machine body to implement bidirectional current output.
In order to realize current direction switching, the 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 and the first end of the second secondary winding of the transformer T1 are connected with the first end of the output inductor L1 in a common mode, and the second end of the output inductor L1 forms the first output end of the current direction switching circuit;
the switch 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 rectification 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 the second power supply output end of the full-bridge rectification 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 connection and disconnection 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 a connection state and a disconnection state before switching;
the absorption circuit 20, the absorption circuit 20 is respectively connected to the first end of the output inductor L1 and the second end of the first switch S1, and the absorption circuit 20 is configured to absorb energy of the inductor during the current switching process.
In this embodiment, the first switch S1 and the second switch S2 are connected in common and cooperate with the output inductor L1 to form a power output end of the current direction switching circuit 100, wherein the first switch S1 and the second switch S2 are used for realizing the current direction of the output inductor L1, so as to change the polarity of the working voltage of the welder body, and in a normal working state, the first switch S1 and the second switch S2 are in an on-off state, that is, when the first switch is turned on, the second switch S2 is turned off.
When the first switch S1 is turned on, the first secondary winding, the upper 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 the first direction, a voltage difference between the first power output terminal and the second power output terminal of the current direction switching circuit 100 is negative, 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 the second direction, and a 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 is triggered by the switching states of the first switch S1 and the second switch S2 when the current of the output inductor L1, i.e. the output current of the current direction switching circuit 100, is smaller than a preset current value, so as to realize 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 the set condition, thereby realizing the switching of the current loop in the first direction to the current loop in the second direction and providing bidirectional voltage for the welding machine body, meanwhile, the absorption circuit 20 absorbs energy during the current switching process, so as to avoid energy accumulation in the output inductor L1, and through setting up absorption circuit 20, saved the power resistance who is used for consuming capacitance voltage, improved conversion efficiency to can realize the reuse of energy, reduce energy waste, improve complete machine efficiency.
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 for each switch according to the magnitude of 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 switched on and controlling the first switch S1 to be switched off; or
When the voltage between the first output terminal and the second output terminal of the current direction switching circuit is positive and the current of the output inductor L1 is smaller than the 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
When the voltage between the first output terminal and the second output terminal of the current direction switching circuit is positive and the current of the output inductor L1 is smaller than the 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 rectification circuit 10 is in a working 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, 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 current affects the working states of the switches of the full-bridge inverter circuit 200 and reduce power consumption during the switching process, 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.
At the beginning of the switching, 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 equally divide the current of the output inductor L1, because the lower bridge arm connected to the second secondary winding exists, and 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 rectification circuit 10 is reversely cut off, the current of the output inductor L1 all 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 large, the current cannot 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 cannot be turned on, at this time, the transformer is in an equivalent open-circuit state, and the voltage of the primary winding charges the transformer excitation output inductor L1.
When the current of the output inductor L1 is reduced to a value that the arc cannot be maintained, the arc is extinguished, the output inductor L1 releases energy due to the open circuit and starts to strike an arc, the energy of the output inductor L1 is released, which causes the current of the output inductor L1 to be further reduced to zero, the absorption circuit 20 no longer absorbs energy, 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, that is, the current of the output inductor L1 reverses 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 rectification 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 a preset current value, the control circuit triggers the current switching operation, meanwhile, in order to avoid that the secondary current affects the operating states of the switches of the full-bridge inverter circuit 200 and reduce power consumption during the switching process, the switching operation occurs in the follow current 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.
At the beginning of the switching, 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 equally divide the current of the output inductor L1, and because the upper bridge arm connected to the first secondary winding exists, the first switch S1 does not pass current.
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 rectification circuit 10 is reversely cut off, the current of the output inductor L1 all 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 large, the current cannot 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 cannot be turned on, at this time, the transformer is in an equivalent open-circuit state, and the voltage of the primary winding charges the transformer excitation output inductor L1.
When the current of the output inductor L1 is reduced to a value that the arc cannot be maintained, the arc is extinguished, the output inductor L1 releases energy due to the open circuit and starts to strike an arc, the energy of the output inductor L1 is released, which causes the current of the output inductor L1 to be further reduced to zero, the absorption circuit 20 no longer absorbs energy, 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, that is, the current of the output inductor L1 reverses and continuously increases, and the current commutation is completed.
In order to prevent the primary winding from directly transmitting energy to the absorption circuit 20, the set voltage value of the absorption circuit 20 is greater than the voltages of the first secondary winding and the second secondary winding.
Meanwhile, each switch in the switch circuit can be correspondingly provided with different types of switch devices such as a triode, a relay and the like according to the power consumption requirement, and the switch circuit is not limited specifically.
Wherein, the absorption circuit 20 can adopt lossless circuits such as capacitance, inductance, etc., as shown in fig. 3, in one embodiment, the absorption circuit 20 includes:
the input end of the unidirectional conduction circuit 21 is respectively connected with the first end of the output inductor L1 and the second end of the first switch S1, and the unidirectional conduction circuit 21 is used for unidirectionally accessing the current of the output inductor L1 in the current direction switching process;
and the energy storage circuit 22 is connected with the output end of the unidirectional conducting circuit 21 and is used for storing the current of the output inductor L1 in the current direction switching process.
The unidirectional conducting circuit 21 is used for realizing unidirectional current output of the output inductor L1, and preventing the current of the absorption circuit 20 from flowing backwards, and the energy storage circuit 22 is used for storing energy.
The specific structures of the unidirectional circuit 21 and the tank circuit 22 may be set correspondingly according to requirements, and in one embodiment, the unidirectional circuit 21 includes a rectifier bridge, and the rectifier bridge includes a first upper arm D5, a second upper arm D6, a first lower arm D7, and a second lower arm D8.
The energy storage circuit 22 comprises a first capacitor C2, a second capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, a first electronic switch tube S3 and a voltage stabilizing diode D9;
the first end of the first capacitor C2, the first end of the second resistor R2 and the positive power 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 in common, 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 in common, 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 output end of the rectifier bridge and the second end of the first electronic switching tube S3 are connected in common.
The first capacitor C2 is configured to store energy, the first resistor R1 and the first electronic switching tube S3 are configured to implement slow start, and avoid causing voltage spikes to a primary winding and a 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 as to increase the energy storage speed of the first capacitor C2, and the zener diode D9 is configured to prevent the gate voltage of the first electronic switching tube S3 from being too large, and at the same time, the voltage of the first capacitor C2 is greater than the voltages of the first secondary winding and the second secondary winding, so as to prevent the primary winding from directly transmitting energy to the absorption circuit 20, where the first electronic switching tube S3 may employ an NMOS tube or an NPN triode, and in one embodiment, the first electronic switching tube S3 is an NMOS tube.
Further, in order to avoid the fault caused by the energy of the energy storage circuit 22 being too high and to ensure the energy to be fully utilized, please continue to refer to fig. 3, in an embodiment, the current direction switching circuit further includes:
and the energy transfer circuit 23 is connected with the energy storage circuit 22, the control circuit and the electric equipment in the welding machine body, and is used for controlled conduction when the voltage of the energy storage circuit 22 is greater than a preset value and releasing the energy of the energy storage circuit 22 to the electric equipment in the welding machine body, so that the energy waste is reduced, and the overall efficiency is improved.
In one embodiment, as shown in fig. 3, the energy transfer circuit 23 includes the energy transfer circuit 23 including a fourth resistor R4, a fifth resistor R5, and a second electronic switch 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 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 to 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 divided voltage values of the fourth resistor R4 and the fifth resistor R5 and the preset voltage value, 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 welding machine body, thereby reducing energy waste and improving overall efficiency.
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;
a first end of the first diode D1, a first end of the third diode D3 and a first end of the first secondary winding are commonly connected, a first end of the second diode D2, a first end of the fourth diode D4 and a second end of the second secondary winding are commonly connected, a second end of the first diode D1, a second end of the second diode D2 and a first end of the first switch S1 are commonly connected, and a second end of the third diode D3, a second end of the fourth diode D4 and a first end of the second switch S2 are commonly connected.
The full-bridge inverter circuit 200 comprises electronic switching tubes Q1, Q2, Q3 and Q4 which form symmetrical bridge arms.
According to the circuit shown in fig. 3, the current direction switching circuit has few high-power devices, and a radiator with smaller volume can be used, so that the overall volume and the cost of the welding machine are reduced.
The invention further 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 above embodiments. The full-bridge inverter circuit 200, the transformer T1 and the output inductor L1 are connected in sequence, and the current direction switching circuit is correspondingly connected with the transformer T1.
In this embodiment, the current direction switching circuit is correspondingly connected to the transformer T1 and the output inductor L1, the transformer T1 is connected to the full-bridge inverter circuit 200, the full-bridge inverter circuit 200 includes four electronic switching tubes for inverting and converting an input dc power into a high-voltage ac power, the transformer T1 includes a primary winding, a first secondary winding and a second secondary winding, the transformer T1 is configured to step-down and convert the high-voltage ac power into a low-voltage ac power, wherein a second end of the first secondary winding of the transformer T1, a first end of the second secondary winding and a first end of the output inductor L1 are connected in common, 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 configured to connect to a welding machine body to implement bidirectional current output.
The present invention further provides a welder device, which includes a welder body and a welder driving circuit, and the specific structure of the welder driving circuit refers to the above embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within 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 includes:
the input end of the full-bridge rectifying circuit is correspondingly connected with the first end of the first secondary winding and the second end of the second secondary winding of the transformer, 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 of the transformer are connected in common, and the second end of the output inductor forms the first output end of the current direction switching circuit;
the switch circuit comprises a first switch and a second switch, wherein the first end of the first switch is connected with the first power supply output end of the full-bridge rectification circuit, the second end of the first switch and the second end of the second switch are connected together to form the second output end of the current direction switching circuit, and the first end of the second switch is connected with the second power supply output end of the full-bridge rectification circuit;
the control circuit is correspondingly connected with the full-bridge inverter circuit and the switch circuit respectively, and triggers and controls the corresponding connection and disconnection of each switch in the switch circuit 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 mutual connection state and a disconnection 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.
2. The current direction switching circuit of 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 switched on and controlling the first switch to be switched off; or
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 switched on and controlling the second switch to be switched 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 freewheeling state.
4. The current direction switching circuit according to any one of claims 1 to 3, wherein the sink circuit comprises:
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 unidirectionally accessing 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 the unidirectional conducting circuit comprises a rectifier bridge.
6. The current direction switching circuit according to 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 switch tube and a zener diode;
the first end of the first capacitor, the first end of the second resistor and the positive power 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 common, 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 voltage stabilizing diode and the controlled end of the first electronic switching tube are connected in common, and the second end of the first resistor, the second end of the second capacitor, the anode of the voltage stabilizing diode, the negative power output end of the rectifier bridge and the second end of the first electronic switching tube are connected in common.
7. The current direction switching circuit of claim 5, further comprising:
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 when the voltage of the energy storage circuit is greater than a preset value and releasing the energy of the energy storage circuit to the electric equipment in the welding machine body.
8. The current direction switching circuit according to claim 7, wherein the energy transfer circuit comprises a fourth resistor, a fifth resistor and a second electronic switching tube;
the first end of the fourth resistor and the first end of the second electronic switching tube are connected with the positive power output end of the rectifier bridge, the second end of the fourth resistor and the first end of the fifth resistor 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 switching tube, the second end of the second electronic switching 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 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, characterized by comprising a welder body and a welder drive circuit as in 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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| 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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| CN113751832B (en) | 2024-03-22 |
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