CN109807435B - Inverter welding machine and protection control circuit thereof - Google Patents
Inverter welding machine and protection control circuit thereof Download PDFInfo
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- CN109807435B CN109807435B CN201811627989.3A CN201811627989A CN109807435B CN 109807435 B CN109807435 B CN 109807435B CN 201811627989 A CN201811627989 A CN 201811627989A CN 109807435 B CN109807435 B CN 109807435B
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Abstract
The invention provides an inverter welding machine and a protection control circuit thereof, wherein the protection control circuit comprises: the protection control module is coupled with the time sequence control circuit of the inverter welding machine, and when the protection control module is conducted with the time sequence control circuit, the time sequence control circuit outputs a low level; the power-on protection module is coupled with the power supply end and the protection control module, controls the protection control module to be conducted with the time sequence control circuit when the inverter welding machine is connected with the power supply, and controls the protection control module to be disconnected with the time sequence control circuit after the inverter welding machine is connected with the power supply for a preset time period; the power failure protection module is coupled with the power supply end and the protection control module, and controls the protection control module to be conducted with the time sequence control circuit when the power supply voltage connected to the inverter welding machine is lower than a preset voltage value; and the manual protection module is coupled with the power supply end and the protection control module and responds to the user operation to control the conduction of the protection control module and the sequential control circuit. The invention improves the reliability of the inverter welding machine.
Description
Technical Field
The invention relates to an electrical element, in particular to an inverter welding machine and a protection control circuit thereof.
Background
With the development of the inverter welding technology, the electric arc welding machine is more and more widely used in household and industry, and the power supply is not stable when the electric arc welding machine is just connected in use; the power failure or other abnormal conditions of the power supply affect electronic devices in the inverter welding machine, so that the probability of damage of the inverter welding machine is increased, and meanwhile, the reliability of the inverter welding machine is reduced.
Disclosure of Invention
An object of the present invention is to provide an inverter welder and a protection control circuit thereof, which overcome the above technical problems due to the limitations and disadvantages of the related art, at least to a certain extent.
Additional features and advantages of the invention will be set forth in the detailed description which follows, or may be learned by practice of the invention.
According to a first aspect of the present invention, there is provided a protection control circuit for an inverter welding machine, comprising:
the protection control module is coupled with a time sequence control circuit of the inverter welding machine, and when the protection control module is conducted with the time sequence control circuit, the time sequence control circuit outputs a low level;
the starting protection module is coupled with a power supply end of the inverter welding machine and the protection control module, controls the protection control module to be conducted with the time sequence control circuit when the inverter welding machine is connected with a power supply, and controls the protection control module to be disconnected with the time sequence control circuit after the inverter welding machine is connected with the power supply for a preset time period;
the power-down protection module is coupled with a power supply end of the inverter welding machine and the protection control module, and controls the protection control module to be conducted with the sequential control circuit when the power supply voltage accessed by the inverter welding machine is lower than a preset voltage value; and
and the manual protection module is coupled with a power supply end of the inverter welding machine and the protection control module, and the manual protection module responds to user operation to control the protection control module to be conducted with the sequential control circuit.
Optionally, the protection control module includes:
the first end is coupled with a time sequence control circuit of the inverter welding machine;
a second terminal grounded;
a third end;
a fourth end;
a first switch transistor, a control electrode of which is coupled to the third terminal, a first electrode of which is coupled to the first terminal, a second electrode of which is coupled to the second terminal, and a control electrode of which controls the conduction of the first electrode and the second electrode, when the first electrode and the second electrode are conducted, the timing control circuit is enabled to output a low level;
one end of the first resistor is coupled with the second end, and the other end of the first resistor is coupled with the third end;
and one end of the second resistor is coupled with the other end of the first resistor, and the other end of the second resistor is coupled with the fourth end.
Optionally, the first switch transistor is a triode, a control electrode of the first switch transistor is a base electrode of the triode, a first electrode of the first switch transistor is an emitter electrode of the triode, and a second electrode of the first switch transistor is a collector electrode of the triode.
Optionally, the boot protection module includes:
the fifth end is coupled with a power supply end of the inverter welding machine;
a sixth terminal coupled to the third terminal of the protection control module;
a first capacitor coupled between the fifth terminal and a sixth terminal;
a third resistor coupled between the first capacitor and the sixth terminal.
Optionally, the predetermined time period is determined according to a capacitance of the first capacitor and a resistance value of the third resistor.
Optionally, the power down protection module includes:
the seventh end is coupled with a power supply end of the inverter welding machine;
an eighth terminal coupled to the fourth terminal of the protection control module;
a ninth terminal grounded;
a fourth resistor, one end of the fourth resistor being coupled to the seventh end;
a first diode, wherein the anode of the first diode is coupled to the other end of the fourth resistor, and the cathode of the first diode is coupled to the eighth end;
a fifth resistor, one end of the fifth resistor being coupled to the seventh end;
the negative electrode of the voltage stabilizing tube is coupled with the other end of the fifth resistor;
a control electrode of the second switch transistor is coupled with the anode of the voltage regulator tube, a first electrode of the second switch transistor is coupled with the anode of the first diode, and a second electrode of the second switch transistor is coupled with the ninth end;
and the second capacitor is coupled between the negative electrode of the voltage regulator tube and the ninth end.
Optionally, the predetermined voltage value is determined according to a regulated voltage value of the voltage regulator tube.
Optionally, the second switch transistor is a triode, a control electrode of the second switch transistor is a base electrode of the triode, a first electrode of the second switch transistor is an emitter electrode of the triode, and a second electrode of the second switch transistor is a collector electrode of the triode.
Optionally, the manual protection module comprises:
the tenth end is coupled with a power supply end of the inverter welding machine;
an eleventh terminal coupled to the fourth terminal of the protection control module;
a first switch coupled between the tenth terminal and the eleventh terminal;
a second diode coupled between the first switch and the eleventh terminal.
According to still another aspect of the present invention, there is also provided an inverter welder including:
a main loop circuit;
a timing control circuit for providing pulse width modulation control to the main loop circuit;
the protection control circuit as described above.
Compared with the prior art, the inverter welding machine and the protection control circuit thereof provided by the invention have the following advantages:
through the design of the protection control circuit, the protection control circuit can play a role in quick protection when the inverter welding machine is switched on and is started and an input power supply is powered off or is shut down; the inverter welding machine can work only after the power supply is switched on and the power supply is controlled to be stable, and can be quickly turned off when the input power supply is powered off or the power supply is controlled to be low. Therefore, through the design of the protection control circuit, the quick protection response of the inverter welding machine when the power supply is switched on and the input power supply is powered off or is shut down is improved, the inverter welding machine is stable in working operation, the inverter welding machine is not damaged, the product quality is improved, the reliability is improved, the service life is prolonged, and the product market competitiveness is improved.
For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the present invention and accompanying drawings, which are included to illustrate and not limit the scope of the present invention.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 is a schematic view of an inverter welder according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a protection control circuit according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a protection control circuit according to an embodiment of the invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the inventive aspects may be practiced without one or more of the specific details, or with other structures, components, steps, methods, and so forth. In other instances, well-known structures, components, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
Referring first to fig. 1, fig. 1 is a schematic diagram of an inverter welding machine according to an embodiment of the present invention. The inverter welder 100 includes a main loop circuit 110, a timing control circuit 130, and a protection control circuit 140.
The inverter welding machine 100 is connected with a network voltage input, is connected with the main loop circuit 110, and performs PWM (pulse width modulation) control on the main loop circuit 110 through the time sequence control circuit 130 to adjust output power. The protection control circuit 140 plays a role in protecting the welder when the welder is powered on and the input power supply is powered off or shut down. The main loop circuit 110 provides the power supply 120 to the timing control circuit 130. The main loop circuit 110 may include a rectifying and filtering circuit 111, an inverter circuit 112, and an output rectifying circuit 113.
The inverter welder is connected with a network voltage input and is connected with an inverter circuit 112 through a rectifying and filtering circuit 111, the inverter circuit 112 is connected with a transformer, the secondary side of the transformer is connected with an output rectifying circuit 113, meanwhile, the rectifying and filtering circuit 111 is connected with a power supply 120, and the power supply 120 provides a working power supply for a time sequence control circuit 130 and a protection control circuit 140. The timing control circuit 130 is connected to the inverter circuit 112 and the protection control circuit 140, the inverter circuit 112 is controlled by the timing control circuit 130 through PWM pulse width modulation, the output power is adjusted, and the protection control circuit 140 plays a role in protection when the welder is powered on and the input power is powered off or shut down. The rectifying and filtering circuit 111 is used for converting the power frequency alternating current input by the network voltage into direct current, and filtering and storing energy by a capacitor to provide stable direct current for the subsequent inverter circuit 112 and the power supply 120. The inverter circuit 112 is used to convert the dc power into ac power with higher frequency, so as to implement frequency conversion and inversion. The transformer is used for changing alternating current voltage into alternating current voltage required by the product during working, and meanwhile, the effect of isolating the input end and the output end loop is achieved. The output rectifying circuit 113 is used to rectify the high-frequency ac input from the transformer into dc power for output. The power supply 120 is used to provide auxiliary power for the control circuit during operation. The timing control circuit 130 is used for performing PWM pulse width modulation control on the inverter circuit 112, adjusting the output power, and controlling the inverter circuit 112.
Fig. 1 is merely a schematic illustration of the modular circuit of the inverter welder 100, and the present invention is not limited thereto.
Referring to fig. 2, fig. 2 is a schematic diagram of a protection control circuit according to an embodiment of the present invention. The protection control circuit 140 is applied to the inverter welder 100 shown in fig. 1. The protection control circuit 140 includes a protection control module 141, a power-on protection module 142, a power-down protection module 143, and a manual protection module 144. The protection control module 141 is coupled to the timing control circuit of the inverter welder (the timing control circuit 130 in fig. 1 is connected by the pin 131). When the protection control module 141 and the timing control circuit are turned on, the timing control circuit outputs a low level to the main loop circuit (fig. 1, numeral 110). The power-on protection module 142 is coupled to the power supply terminal of the inverter welding machine and the protection control module 141. When the inverter welder is connected to the power supply, the start-up protection module 142 controls the protection control module 141 to be connected to the timing control circuit, and after a predetermined time period when the inverter welder is connected to the power supply, the start-up protection module 142 controls the protection control module 141 to be disconnected from the timing control circuit. The power down protection module 143 is coupled to the power supply terminal of the inverter welder and the protection control module 141. When the power supply voltage accessed by the inverter welding machine is lower than a preset voltage value, the power-down protection module 143 controls the protection control module 141 to be conducted with the sequential control circuit. The manual protection module 144 is coupled to the power supply terminal of the inverter welder and the protection control module 141. The manual protection module 144 controls the protection control module 141 to be conducted with the timing control circuit in response to a user operation.
Therefore, through the design of the protection control circuit, the protection control circuit can play a role in quick protection when the inverter welding machine is powered on and the input power supply is powered off or shut down; the inverter welding machine can work only after the power supply is switched on and the power supply is controlled to be stable, and can be quickly turned off when the input power supply is powered off or the power supply is controlled to be low. Therefore, through the design of the protection control circuit, the quick protection response of the inverter welding machine when the power supply is switched on and the input power supply is powered off or is shut down is improved, the inverter welding machine is stable in working operation, the inverter welding machine is not damaged, the product quality is improved, the reliability is improved, the service life is prolonged, and the product market competitiveness is improved.
An embodiment of the protection control circuit 140 provided by the present invention is described below with reference to fig. 3.
The protection control module 141 of the protection control circuit 140 includes a first terminal coupled to the timing control circuit of the inverter welder, a second terminal grounded, a third terminal, and a fourth terminal. The protection control circuit 140 further includes a first switching transistor Q1, a first resistor R1, and a second resistor R2.
The control electrode of the first switch transistor Q1 is coupled to the third terminal, the first electrode of the first switch transistor Q1 is coupled to the first terminal, the second electrode of the first switch transistor Q1 is coupled to the second terminal, the control electrode of the first switch transistor Q1 controls the conduction of the first and second electrodes, and when the first and second electrodes are conducted, the timing control circuit is enabled to output a low level to the main circuit (fig. 1, 110). One end of a first resistor R1 is coupled to the second end, and the other end of the first resistor R1 is coupled to the third end. One end of a second resistor R2 is coupled to the other end of the first resistor R1, and the other end of the second resistor R2 is coupled to the fourth end.
In this embodiment, the first switch transistor Q1 is a triode, the control electrode of the first switch transistor Q1 is the base electrode of the triode, the first electrode of the first switch transistor Q1 is the emitter electrode of the triode, and the second electrode of the first switch transistor Q1 is the collector electrode of the triode. The first switching transistor may also be another transistor with a switching function, which is not described herein.
The power-on protection module 142 of the protection control circuit 140 includes a fifth terminal coupled to the power supply terminal of the inverter welder and a sixth terminal coupled to the third terminal of the protection control module. The power-on protection module 142 further includes a first capacitor C1 and a third resistor R3. A first capacitance C1 is coupled between the fifth and sixth terminals. A third resistor R3 is coupled between the first capacitor C1 and the sixth terminal.
Specifically, when the inverter welder is started, the power supply (VCC) of the inverter welder charges the first capacitor C1 and the third resistor R3, the charging time is determined by the capacitance value of the first capacitor C1 and the resistance value of the third resistor R3, during the charging process, the third resistor R3 is provided for the control electrode of the first switching transistor Q1, the first electrode and the second electrode of the first switching transistor Q1 are conducted, and the first end of the protection control module 141 is connected to the timing control circuit, so that the timing control circuit outputs a low level. When a capacitor C1 is fully charged and no current flows between the two terminals, the first switch transistor Q1 is not turned on, and does not affect the timing control circuit. Therefore, the inverter welding machine can work after the power is switched on stably, and the fact that the inverter welding machine cannot output work at the moment of starting is ensured.
The power down protection module 143 of the protection control circuit 140 includes a seventh terminal coupled to a power supply terminal of the inverter welder, an eighth terminal coupled to a fourth terminal of the protection control module, and a ninth terminal connected to ground. The power down protection module 143 further includes a fourth resistor R4, a first diode D1, a fifth resistor R5, a voltage regulator tube Z1, a second switching transistor Q2, and a second capacitor C2.
One end of the fourth resistor R4 is coupled to the seventh end. The anode of the first diode D1 is coupled to the other end of the fourth resistor R4, and the cathode of the first diode D1 is coupled to the eighth end. One end of the fifth resistor R5 is coupled to the seventh end. The cathode of the voltage regulator tube Z1 is coupled with the other end of the fifth resistor R5. A control electrode of a second switching transistor Q2 is coupled to the anode of the zener diode Z1, a first electrode of the second switching transistor Q2 is coupled to the anode of the first diode D1, and a second electrode of the second switching transistor Q2 is coupled to the ninth terminal. A second capacitor C2 is coupled between the negative terminal of the zener Z1 and the ninth terminal.
In this embodiment, the second switching transistor Q2 is a triode, the control electrode of the second switching transistor Q2 is the base electrode of the triode, the first electrode of the second switching transistor Q2 is the emitter electrode of the triode, and the second electrode of the second switching transistor Q2 is the collector electrode of the triode. The second switching transistor may also be another transistor with a switching function, which is not described herein.
Specifically, the power-down protection module 143 sets a voltage regulation value of the regulator Z1 to protect when a power supply (VCC) of the inverter welder is lower than the voltage regulation value of the regulator Z1, when the VCC power supply is higher than the voltage regulation value of the regulator Z1, the regulator Z1 is turned on to operate the second switching transistor Q2, and when the second switching transistor Q2 operates, the positive electrode terminal of the first diode D1 is pulled low, the first electrode and the second electrode of the first switching transistor Q1 are not turned on, and the timing control circuit is not affected. When the input power supply is powered off or shut down in the operation of the inverter welding machine, the VCC power supply suddenly becomes low, when the VCC power supply is lower than the voltage stabilizing value of the stabilivolt Z1, the stabilivolt Z1 is not conducted, so that the second switching transistor Q2 does not work, when the second switching transistor Q2 does not work, the control electrode of the first switching transistor Q1 is supplied with power through the VCC power supply, the fourth resistor R4, the first diode D1 and the second resistor R2, so that the first switching transistor Q1 is quickly conducted and works, and the first end of the protection control module 141 is connected with the timing control circuit, so that the timing control circuit outputs a low level.
By adjusting the threshold value of the voltage stabilizing tube Z1, the voltage stabilizing tube can change the voltage of the VCC power supply to play a role in protection when the VCC power supply is lower than a certain voltage. For example, the regulated value of the regulator tube Z1 is 13V, and the fast protection effect is achieved when the VCC power supply is lower than 13V. The protective power supply threshold value can be adjusted correspondingly according to different safety circuit requirements.
The manual protection module 144 of the protection control circuit 140 includes a tenth terminal coupled to the power supply terminal of the inverter welder and a tenth terminal coupled to the fourth terminal of the protection control module. The manual protection module 144 further includes a first switch SW1 and a second diode D2. A first switch SW1 is coupled between the tenth terminal and the eleventh terminal. A second diode D2 is coupled between the first switch SW1 and the eleventh terminal.
Specifically, the protection is performed by manually controlling the opening of the first switch SW1 of the manual protection module 144. When the first switch SW1 is turned off, the positive terminal of the second diode D2 is turned off, and the protection is not performed at this time, and when the first switch SW1 is turned on, the control electrode of the first switching transistor Q1 is supplied with power through the VCC power supply, the first switch SW1, the second diode D2, and the second resistor R2, so that the first switching transistor Q1 is turned on to operate, and the first terminal of the protection control module 141 is connected to the timing control circuit, so that the timing control circuit outputs a low level.
Therefore, through the design of the protection control circuit, the protection control circuit can play a role in quick protection when the inverter welding machine is powered on and the input power supply is powered off or shut down; the inverter welding machine can work only after the power supply is switched on and the power supply is controlled to be stable, and can be quickly turned off when the input power supply is powered off or the power supply is controlled to be low. Therefore, through the design of the protection control circuit, the quick protection response of the inverter welding machine when the power supply is switched on and the input power supply is powered off or is shut down is improved, the inverter welding machine is stable in working operation, the inverter welding machine is not damaged, the product quality is improved, the reliability is improved, the service life is prolonged, and the product market competitiveness is improved.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (10)
1. A protection control circuit is characterized by being applied to an inverter welding machine and comprising:
the protection control module is coupled with a time sequence control circuit of the inverter welding machine, and when the protection control module is conducted with the time sequence control circuit, the time sequence control circuit outputs a low level;
the starting protection module is coupled with a power supply end of the inverter welding machine and the protection control module, controls the protection control module to be conducted with the time sequence control circuit when the inverter welding machine is connected with a power supply, and controls the protection control module to be disconnected with the time sequence control circuit after the inverter welding machine is connected with the power supply for a preset time period;
the power-down protection module is coupled with a power supply end of the inverter welding machine and the protection control module, and controls the protection control module to be conducted with the sequential control circuit when the power supply voltage accessed by the inverter welding machine is lower than a preset voltage value; and
and the manual protection module is coupled with a power supply end of the inverter welding machine and the protection control module, and the manual protection module responds to user operation to control the protection control module to be conducted with the sequential control circuit.
2. The protection control circuit of claim 1, wherein the protection control module comprises:
the first end is coupled with a time sequence control circuit of the inverter welding machine;
a second terminal grounded;
a third end;
a fourth end;
a first switch transistor, a control electrode of which is coupled to the third terminal, a first electrode of which is coupled to the first terminal, a second electrode of which is coupled to the second terminal, and a control electrode of which controls the conduction of the first electrode and the second electrode, when the first electrode and the second electrode are conducted, the timing control circuit is enabled to output a low level;
one end of the first resistor is coupled with the second end, and the other end of the first resistor is coupled with the third end;
and one end of the second resistor is coupled with the other end of the first resistor, and the other end of the second resistor is coupled with the fourth end.
3. The protection control circuit of claim 2, wherein the first switching transistor is a transistor, the control electrode of the first switching transistor is a base electrode of the transistor, the first electrode of the first switching transistor is an emitter electrode of the transistor, and the second electrode of the first switching transistor is a collector electrode of the transistor.
4. The protection control circuit of claim 2, wherein the power-on protection module comprises:
the fifth end is coupled with a power supply end of the inverter welding machine;
a sixth terminal coupled to the third terminal of the protection control module;
a first capacitor coupled between the fifth terminal and a sixth terminal;
a third resistor coupled between the first capacitor and the sixth terminal.
5. The protection control circuit according to claim 4, wherein the predetermined period of time is determined based on a capacitance of the first capacitor and a resistance value of the third resistor.
6. The protection control circuit of claim 2, wherein the power down protection module comprises:
the seventh end is coupled with a power supply end of the inverter welding machine;
an eighth terminal coupled to the fourth terminal of the protection control module;
a ninth terminal grounded;
a fourth resistor, one end of the fourth resistor being coupled to the seventh end;
a first diode, wherein the anode of the first diode is coupled to the other end of the fourth resistor, and the cathode of the first diode is coupled to the eighth end;
a fifth resistor, one end of the fifth resistor being coupled to the seventh end;
the negative electrode of the voltage stabilizing tube is coupled with the other end of the fifth resistor;
a control electrode of the second switch transistor is coupled with the anode of the voltage regulator tube, a first electrode of the second switch transistor is coupled with the anode of the first diode, and a second electrode of the second switch transistor is coupled with the ninth end;
and the second capacitor is coupled between the negative electrode of the voltage regulator tube and the ninth end.
7. The protection control circuit according to claim 6, wherein the predetermined voltage value is determined according to a regulated voltage value of the regulator tube.
8. The protection control circuit of claim 6, wherein the second switching transistor is a transistor, the control electrode of the second switching transistor is a base electrode of the transistor, the first electrode of the second switching transistor is an emitter electrode of the transistor, and the second electrode of the second switching transistor is a collector electrode of the transistor.
9. The protection control circuit of claim 2, wherein the manual protection module comprises:
the tenth end is coupled with a power supply end of the inverter welding machine;
an eleventh terminal coupled to the fourth terminal of the protection control module;
a first switch coupled between the tenth terminal and the eleventh terminal;
a second diode coupled between the first switch and the eleventh terminal.
10. An inverter welder, comprising:
a main loop circuit;
a timing control circuit for providing pulse width modulation control to the main loop circuit;
a protection control circuit as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811627989.3A CN109807435B (en) | 2018-12-28 | 2018-12-28 | Inverter welding machine and protection control circuit thereof |
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| CN201811627989.3A CN109807435B (en) | 2018-12-28 | 2018-12-28 | Inverter welding machine and protection control circuit thereof |
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| CN110625221B (en) * | 2019-09-23 | 2022-04-29 | 佛山耀立电气有限公司 | Method and device for storing abnormal power failure parameters during welding parameter adjustment and welding machine |
| CN112783031B (en) * | 2020-12-30 | 2021-12-17 | 中国科学院长春光学精密机械与物理研究所 | Soft instruction starting control and level signal isolation circuit system |
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| JPS5970468A (en) * | 1982-10-12 | 1984-04-20 | Ishikawajima Harima Heavy Ind Co Ltd | Illuminating device for welding work |
| CN1124185A (en) * | 1995-10-06 | 1996-06-12 | 钟洪声 | Protective method and circuit for power supply switch tube of high frequency inversion electric welder |
| CN1654151A (en) * | 2005-02-28 | 2005-08-17 | 张鑫 | Automatic power on/off controlling device of electric welding machine |
| CN201291341Y (en) * | 2008-10-17 | 2009-08-19 | 唐山松下产业机器有限公司 | Controllable silicon welding machine and protective circuit |
| CN205629628U (en) * | 2016-02-01 | 2016-10-12 | 上海美佳尼克焊接技术有限公司 | Be applied to current foldback circuit and IGBT contravariant welding machine of IGBT contravariant welding machine |
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2018
- 2018-12-28 CN CN201811627989.3A patent/CN109807435B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5970468A (en) * | 1982-10-12 | 1984-04-20 | Ishikawajima Harima Heavy Ind Co Ltd | Illuminating device for welding work |
| CN1124185A (en) * | 1995-10-06 | 1996-06-12 | 钟洪声 | Protective method and circuit for power supply switch tube of high frequency inversion electric welder |
| CN1654151A (en) * | 2005-02-28 | 2005-08-17 | 张鑫 | Automatic power on/off controlling device of electric welding machine |
| CN201291341Y (en) * | 2008-10-17 | 2009-08-19 | 唐山松下产业机器有限公司 | Controllable silicon welding machine and protective circuit |
| CN205629628U (en) * | 2016-02-01 | 2016-10-12 | 上海美佳尼克焊接技术有限公司 | Be applied to current foldback circuit and IGBT contravariant welding machine of IGBT contravariant welding machine |
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| CN109807435A (en) | 2019-05-28 |
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