CN110932251A - Dual protection system for realizing double-voltage rectification dual-power control of welding machine power supply - Google Patents
Dual protection system for realizing double-voltage rectification dual-power control of welding machine power supply Download PDFInfo
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- CN110932251A CN110932251A CN201911160618.3A CN201911160618A CN110932251A CN 110932251 A CN110932251 A CN 110932251A CN 201911160618 A CN201911160618 A CN 201911160618A CN 110932251 A CN110932251 A CN 110932251A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/006—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too high or too low voltage
Abstract
The invention relates to a double-protection system for realizing double-voltage rectification double-power control of a welding machine power supply, which comprises a double-power input end, a main loop switch unit, a rectifier bridge, a power output end, a double-voltage switch unit, a double-voltage unit, a voltage detection unit, a hard protection control unit, a double-voltage switch control unit and a single chip microcomputer control unit. The invention judges whether to carry out double voltage on the input power supply of the double power supply input end by acquiring the voltage signal of the double power supply input end, and detects whether the double voltage switch unit acts correctly, if not, the main loop switch unit is not closed; a voltage detection unit is added to detect the input end of the double power supplies, and when the input voltage is larger than a certain value, the voltage doubling switch unit is closed through the hard protection control unit to close the voltage doubling.
Description
Technical Field
The invention relates to the technical field of welding machine power supplies, in particular to a dual-protection system for realizing dual-voltage rectification dual-power control of a welding machine power supply.
Background
Chinese patent with publication number CN202940766U discloses a single-phase permanent magnet synchronous motor driving circuit, which comprises a double-voltage rectification dual-power-supply circuit, wherein the output ends of the double-voltage rectification dual-power-supply circuit are respectively a direct current output DC +, a direct current output DC-, and a power source neutral point DCO as a reference; the anode of the diode D1 is communicated to the anode of the capacitor E1; the cathode of the capacitor E1 is communicated to the anode of the capacitor E2; the cathode of the capacitor E2 is communicated to the cathode of the diode D2; the anode of the diode D2 is communicated to the cathode of the diode D1; the alternating current input end AC1 is communicated to the cathode of the diode D1; the alternating current input end AC2 is communicated to the negative electrode of the capacitor E1; the positive electrode of the capacitor E1 is DC output; the negative electrode of the capacitor E1 is a power supply central point DC 0; the negative pole of the capacitor E2 is the DC output DC-.
The working principle of the double-voltage rectification double-power circuit is as follows: the diode D1 and the capacitor E1 rectify, store and filter the positive half cycle of the alternating current power supply; the diode D2 and the capacitor E2 rectify, store and filter the negative half cycle of the alternating current power supply. The capacitor E1 and the capacitor E2 absorb the induced current from the motor and are matched with the freewheeling diodes in the power switch tube K1 and the power switch tube K2.
The above prior art solutions have the following drawbacks: the voltage doubling rectifying circuit cannot be detected and controlled, and when the input voltage is too high, the voltage doubling is continued, so that the voltage of the output end of the power supply is possibly too high, and risks of damaging loads and the like exist.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a dual protection system for realizing dual voltage rectification dual power control of a welding machine power supply.
The above object of the present invention is achieved by the following technical solutions:
a double protection system for realizing double-voltage rectification double-power control of a welding machine power supply comprises a double-power input end, a main loop switch unit, a rectifier bridge, a power output end, a double-voltage switch unit, a double-voltage unit, a voltage detection unit, a hard protection control unit, a double-voltage switch control unit and a single chip microcomputer control unit; the dual-power input end is connected with the input end of the main loop switch unit and the input end of the voltage detection unit, the output end of the voltage detection unit is connected with the input end of the hard protection control unit, the output end of the hard protection control unit is connected with the input end of the voltage doubling switch control unit, the output end of the double-voltage switch control unit is connected with the detection end of the single chip microcomputer control unit and the control end of the double-voltage switch unit, the output end of the main loop switch unit is connected with the input end of the rectifier bridge power supply and the input end of the voltage doubling switch unit, the direct current output end of the rectifier bridge is connected with the power supply output end and the input end of the voltage doubling unit, the output end of the voltage doubling switch unit is connected with the control end of the voltage doubling unit, the first control end of the single chip microcomputer control unit is connected with the control end of the main loop switch unit, and the second control end of the single chip microcomputer control unit is connected with the input end of the double voltage switch control unit.
By adopting the technical scheme, whether the input power supply of the dual-power input end is subjected to voltage doubling is judged by collecting the voltage signal of the dual-power input end, whether the voltage doubling switch unit acts correctly is detected, and if the voltage doubling switch unit does not act correctly, the main loop switch unit is not closed; a voltage detection unit is added to detect the input end of the double power supplies, and when the input voltage is larger than a certain value, the voltage doubling switch unit is closed through the hard protection control unit to close the voltage doubling.
The invention is further configured to: the voltage detection unit comprises a resistor R3, a voltage dependent resistor VR1, a capacitor C5 and a diode D6 which are sequentially connected in series, two ends of the capacitor C5 serve as output ends of the voltage detection unit, and the other end of the resistor R3 and a cathode of the diode D6 are respectively connected with positive and negative ends of the input end of the double power supply.
By adopting the technical scheme, when the input voltage is higher than the preset value, the resistance value of the voltage dependent resistor VR1 is changed from infinity to 0, so that a control signal is sent to the hard protection control unit.
The invention is further configured to: hard protection the control unit and include opto-coupler U1, electric capacity C6, electric capacity C7 and resistance R4, opto-coupler U1 input conduct protection the control unit's input hard, opto-coupler U1 output is connected electric capacity C6 one end, electric capacity C7 one end and resistance R4 one end and conduct protection the control unit's output hard, electric capacity C6 other end and electric capacity C7 other end ground connection, direct current power supply VCC is connected to the resistance R4 other end.
By adopting the technical scheme, when the input voltage is higher than the preset value, according to the control signal sent by the voltage detection unit, the input end of the optical coupler U1 is switched on, so that the output end of the optical coupler U1 is controlled to be switched on, and the control signal is sent by the voltage doubling switch control unit.
The invention is further configured to: the voltage-doubling switch control unit comprises a triode Q1, the control end of the triode Q1 is used as the input end of the voltage-doubling switch control unit, one end of the triode Q1 is used as the output end of the voltage-doubling switch control unit, and the other end of the triode Q1 is grounded.
By adopting the technical scheme, when the input voltage is higher than the preset value, the triode Q1 is controlled to be switched off from on according to the control signal sent by the hard protection control unit.
The invention is further configured to: the voltage-doubling switch unit comprises a relay CR2 and a diode D5, one end of an output loop of the relay CR2 serves as an input end of the voltage-doubling switch unit, the other end of the output loop of the relay CR2 serves as an output end of the voltage-doubling switch unit, one end of an input loop of the relay CR2 is connected with a cathode of the diode D5 and a direct-current power supply VCC, and the other end of the input loop of the relay CR2 is connected with an anode of the diode D5 and serves as a control end of the voltage-doubling switch unit.
By adopting the technical scheme, when the input voltage is higher than the preset value, the input loop of the relay CR2 is switched from on to off, and the voltage doubling is turned off.
The invention is further configured to: the main loop switch unit comprises a relay and a peripheral circuit thereof, an input loop of the relay is controlled by the single-chip microcomputer control unit, and two ends of an output loop of the relay are respectively used as an input end and an output end of the main loop switch unit.
By adopting the technical scheme, the singlechip control unit judges whether the singlechip signal is correctly executed or not by detecting the working state of the output end of the voltage doubling switch control unit, if so, the main loop switch unit is closed, and the system enters the working state; otherwise, the main loop switch unit is disconnected, and the system cannot work normally.
The invention is further configured to: the rectifier bridge comprises a diode D1, a diode D2, a diode D3 and a diode D4, the cathode of the diode D1 is connected with the anode of the diode D4 and serves as the rectifier bridge power input end L, the cathode of the diode D2 is connected with the anode of the diode D3 and serves as the rectifier bridge power input end N, the cathode of the diode D4 is connected with the cathode of the diode D3 and serves as the rectifier bridge direct current output end + V, and the anode of the diode D1 is connected with the anode of the diode D2 and serves as the rectifier bridge direct current output end-V.
By adopting the technical scheme, the rectifier bridge adopts full-bridge rectification, and when the input voltage is higher than the preset value and the double voltage is closed, normal input voltage supply is provided.
The invention is further configured to: the voltage doubling unit comprises a capacitor C1, a capacitor C2, a resistor R1 and a resistor R2; one end of the capacitor C1 is connected with one end of the capacitor C2, one end of the resistor R1 and one end of the resistor R2 and serves as a control end of the voltage doubling unit, the other end of the capacitor C1 is connected with the other end of the resistor R1 and serves as an input end of the voltage doubling unit, and the other end of the capacitor C2 is connected with the other end of the resistor R2 and serves as an input end of the voltage doubling unit.
By adopting the technical scheme, the voltage doubling circuit is adopted, and when the input voltage is lower than the preset value, the voltage of double voltage is provided as the output power supply.
The invention is further configured to: the voltage doubling unit further comprises a capacitor C3 and a capacitor C4, one end of the capacitor C3 is connected with one end of the capacitor C4 and serves as a control end of the voltage doubling unit, the other end of the capacitor C3 serves as an input end of the voltage doubling unit, and the other end of the capacitor C4 serves as an input end of the voltage doubling unit.
By adopting the technical scheme, the capacitor C3 and the capacitor C4 are respectively connected with the capacitor C1 and the capacitor C2 in parallel, so that the system reliability of the voltage doubling circuit is improved.
In conclusion, the beneficial technical effects of the invention are as follows:
1. by collecting voltage signals of the dual-power input end, judging whether to carry out voltage doubling on an input power supply of the dual-power input end, detecting whether a voltage doubling switch acts correctly, and if not, not closing a main loop switch;
2. a voltage detection unit is added to detect the input end of the double power supplies, and when the input voltage is larger than a certain value, the voltage doubling switch unit is closed through the hard protection control unit to close the voltage doubling.
Drawings
FIG. 1 is a functional block diagram of the system of the present invention;
fig. 2 is a circuit schematic of the system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the dual protection system for realizing dual voltage rectification dual power control for a welding machine power supply disclosed by the invention comprises a dual power input end, a main loop switch unit, a rectifier bridge, a power output end, a dual voltage switch unit, a dual voltage unit, a voltage detection unit, a hard protection control unit, a dual voltage switch control unit and a single chip microcomputer control unit; the double-power-supply input end is connected with the input end of the main loop switch unit and the input end of the voltage detection unit, the output end of the voltage detection unit is connected with the input end of the hard protection control unit, the output end of the hard protection control unit is connected with the input end of the double-voltage switch control unit, the output end of the double-voltage switch control unit is connected with the detection end of the single chip microcomputer control unit and the control end of the double-voltage switch unit, the output end of the main loop switch unit is connected with the input end of the rectifier bridge power supply (the input end of the power supply L and the input end of the power supply N) and the input end of the double-voltage switch unit, the direct current output end of the rectifier bridge (the direct current output end + V and the direct current output end-V) is connected with the input end of the double-voltage switch unit, the output end of the double-voltage switch unit is connected with the control, and the second control end of the singlechip control unit is connected with the input end of the double-voltage switch control unit.
Referring to fig. 2, the voltage detection unit includes a resistor R3, a voltage dependent resistor VR1, a capacitor C5 and a diode D6, which are connected in series in sequence, two ends of the capacitor C5 are used as output ends of the voltage detection unit, and the other end of the resistor R3 and a cathode of the diode D6 are respectively connected to positive and negative ends of the dual power input end.
Continuing to refer to fig. 2, hard protection the control unit includes opto-coupler U1, electric capacity C6, electric capacity C7 and resistance R4, opto-coupler U1 input is regarded as hard protection the control unit's input, opto-coupler U1 output is connected electric capacity C6 one end, electric capacity C7 one end and resistance R4 one end and regard as hard protection the control unit's output, electric capacity C6 other end and electric capacity C7 other end ground connection, direct current power supply VCC is connected to the resistance R4 other end.
With continued reference to fig. 2, the voltage-doubling switch control unit includes a transistor Q1, a control terminal of the transistor Q1 is used as an input terminal of the voltage-doubling switch control unit, one end of the transistor Q1 is used as an output terminal of the voltage-doubling switch control unit, and the other end of the transistor Q1 is grounded.
With reference to fig. 2, the voltage-doubling switch unit includes a relay CR2 and a diode D5, one end of an output loop of the relay CR2 is used as an input end of the voltage-doubling switch unit, the other end of the output loop of the relay CR2 is used as an output end of the voltage-doubling switch unit, one end of an input loop of the relay CR2 is connected to a cathode of the diode D5 and a dc power VCC, and the other end of the input loop of the relay CR2 is connected to an anode of the diode D5 and is used as a control end of the voltage-doubling switch unit.
With continued reference to fig. 2, the main circuit switch unit SW1 includes a relay and its peripheral circuits (not shown), and the input circuit of the relay is controlled by the single-chip microcomputer control unit, and two ends of the output circuit of the relay are respectively used as the input end and the output end of the main circuit switch unit.
With continued reference to fig. 2, the rectifier bridge includes a diode D1, a diode D2, a diode D3, and a diode D4, the cathode of the diode D1 is connected to the anode of the diode D4 and serves as the rectifier bridge power input terminal L, the cathode of the diode D2 is connected to the anode of the diode D3 and serves as the rectifier bridge power input terminal N, the cathode of the diode D4 is connected to the cathode of the diode D3 and serves as the rectifier bridge dc output terminal + V, and the anode of the diode D1 is connected to the anode of the diode D2 and serves as the rectifier bridge dc output terminal-V.
With continued reference to fig. 2, the voltage doubling unit includes a capacitor C1, a capacitor C2, a resistor R1, and a resistor R2; one end of the capacitor C1 is connected to one end of the capacitor C2, one end of the resistor R1 and one end of the resistor R2 and serves as a control end of the voltage doubling unit, the other end of the capacitor C1 is connected to the other end of the resistor R1 and serves as an input end of the voltage doubling unit (connected to the rectifier bridge dc output end + V), and the other end of the capacitor C2 is connected to the other end of the resistor R2 and serves as an input end of the voltage doubling unit (connected to the rectifier bridge dc output end-V).
With reference to fig. 2, the voltage doubling unit further includes a capacitor C3 and a capacitor C4, one end of the capacitor C3 is connected to one end of the capacitor C4 and serves as a control end of the voltage doubling unit, the other end of the capacitor C3 serves as an input end of the voltage doubling unit (connected to the rectifier bridge dc output end + V), and the other end of the capacitor C4 serves as an input end of the voltage doubling unit (connected to the rectifier bridge dc output end-V).
With continued reference to fig. 2, the present embodiment provides a dual protection system for realizing dual voltage rectification dual power control of a welder power supply, wherein a dual power input terminal L (identified as an L input terminal P1 of a first power supply and an L input terminal P2 of a second power supply in the figure) connects a cathode of a diode D6, a cathode of a diode D1, an anode of a diode D4 and one end of an output loop of a relay CR2, a dual power input terminal N (identified as an N input terminal P3 of the first power supply and an N input terminal P4 of the second power supply in the figure) connects one end of a main loop switch unit SW1 and one end of a resistor R3, the other end of the main loop switch unit SW1 connects a cathode of a diode D2 and an anode of a diode D3, the other end of the resistor R3 connects one end of a varistor VR1, the other end of the varistor VR1 connects one end of a capacitor C5 and an input end (pin 1) of an optocoupler U37, an output end (4 feet) of an optocoupler U1 is connected with one end of a capacitor C6, one end of a capacitor C7, one end of a resistor R4, a control end of a triode Q1 and a second control end (5 feet) of a singlechip CN1, an output end (3 feet) of an optocoupler U1, the other end of a capacitor C6, the other end of a capacitor C7 and the other end of a triode Q1 are grounded, the other end of a resistor R4 is connected with a direct-current power supply VCC, one end of a triode Q1 is connected with a detection end (2 feet) of a singlechip CN1, an LED cathode, an anode of a diode D5 and one end of an input loop of a relay CR2, the other end of the input loop of the relay CR2 is connected with a cathode of a diode D2 and the direct-current power supply VCC, an anode of the LED is connected with a resistor R2 in series and then connected with the direct-current power supply VCC, the other end of an output loop of the relay CR2 is connected with one end of a capacitor, The cathode of the diode D4, the cathode of the diode D3 and the DC output end + V of the power output end CN0, the other end of the capacitor C2 is connected with the other end of the capacitor C4, the other end of the resistor R2, the anode of the diode D1, the anode of the diode D2 and the DC output end-V of the power output end CN 0. The main circuit switch unit SW1 includes a relay and its peripheral circuits (not shown), and the input circuit of the relay is controlled by the single chip microcomputer control unit, and the output circuit of the relay is the main circuit switch unit SW 1.
The implementation principle of the embodiment is as follows: when the voltage is higher than a preset value, the resistance value of the voltage dependent resistor VR1 is changed from infinity to 0, at the moment, the optocoupler U1 is switched on, the triode Q1 is switched off, the output loop of the relay CR2 is switched off, and the voltage doubling is switched off; on the contrary, the voltage dependent resistor VR1 is in an open circuit state, the optocoupler U1 is disconnected, the state of the triode Q1 is determined by the single chip microcomputer, the single chip microcomputer detects the working state of the triode Q1 (a 2-pin signal of CN 1), judges whether the relay CR2 correctly executes a signal of the single chip microcomputer, and controls the main loop switch unit SW1 to be closed to enter the working state if the signal is correctly executed; on the contrary, the main circuit switch unit SW1 is turned off, and the system cannot operate normally.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. The utility model provides a dual protection system that welding machine power realized two times of voltage rectification dual supply control which characterized in that: the double-voltage protection circuit comprises a double-power-supply input end, a main loop switch unit, a rectifier bridge, a power supply output end, a double-voltage switch unit, a double-voltage unit, a voltage detection unit, a hard protection control unit, a double-voltage switch control unit and a single chip microcomputer control unit; the dual-power input end is connected with the input end of the main loop switch unit and the input end of the voltage detection unit, the output end of the voltage detection unit is connected with the input end of the hard protection control unit, the output end of the hard protection control unit is connected with the input end of the voltage doubling switch control unit, the output end of the double-voltage switch control unit is connected with the detection end of the single chip microcomputer control unit and the control end of the double-voltage switch unit, the output end of the main loop switch unit is connected with the input end of the rectifier bridge power supply and the input end of the voltage doubling switch unit, the direct current output end of the rectifier bridge is connected with the power supply output end and the input end of the voltage doubling unit, the output end of the voltage doubling switch unit is connected with the control end of the voltage doubling unit, the first control end of the single chip microcomputer control unit is connected with the control end of the main loop switch unit, and the second control end of the single chip microcomputer control unit is connected with the input end of the double voltage switch control unit.
2. The dual protection system for realizing the dual voltage rectification dual power supply control of the welder power supply according to claim 1, is characterized in that: the voltage detection unit comprises a resistor R3, a voltage dependent resistor VR1, a capacitor C5 and a diode D6 which are sequentially connected in series, two ends of the capacitor C5 serve as output ends of the voltage detection unit, and the other end of the resistor R3 and a cathode of the diode D6 are respectively connected with positive and negative ends of the input end of the double power supply.
3. The dual protection system for realizing the dual voltage rectification dual power supply control of the welder power supply according to claim 1, is characterized in that: hard protection the control unit and include opto-coupler U1, electric capacity C6, electric capacity C7 and resistance R4, opto-coupler U1 input conduct protection the control unit's input hard, opto-coupler U1 output is connected electric capacity C6 one end, electric capacity C7 one end and resistance R4 one end and conduct protection the control unit's output hard, electric capacity C6 other end and electric capacity C7 other end ground connection, direct current power supply VCC is connected to the resistance R4 other end.
4. The dual protection system for realizing the dual voltage rectification dual power supply control of the welder power supply according to claim 1, is characterized in that: the voltage-doubling switch control unit comprises a triode Q1, the control end of the triode Q1 is used as the input end of the voltage-doubling switch control unit, one end of the triode Q1 is used as the output end of the voltage-doubling switch control unit, and the other end of the triode Q1 is grounded.
5. The dual protection system for realizing the dual voltage rectification dual power supply control of the welder power supply according to claim 1, is characterized in that: the voltage-doubling switch unit comprises a relay CR2 and a diode D5, one end of an output loop of the relay CR2 serves as an input end of the voltage-doubling switch unit, the other end of the output loop of the relay CR2 serves as an output end of the voltage-doubling switch unit, one end of an input loop of the relay CR2 is connected with a cathode of the diode D5 and a direct-current power supply VCC, and the other end of the input loop of the relay CR2 is connected with an anode of the diode D5 and serves as a control end of the voltage-doubling switch unit.
6. The dual protection system for realizing the dual voltage rectification dual power supply control of the welder power supply according to claim 1, is characterized in that: the main loop switch unit comprises a relay and a peripheral circuit thereof, an input loop of the relay is controlled by the single-chip microcomputer control unit, and two ends of an output loop of the relay are respectively used as an input end and an output end of the main loop switch unit.
7. The dual protection system for realizing the dual voltage rectification dual power supply control of the welder power supply according to claim 1, is characterized in that: the rectifier bridge comprises a diode D1, a diode D2, a diode D3 and a diode D4, the cathode of the diode D1 is connected with the anode of the diode D4 and serves as the rectifier bridge power input end L, the cathode of the diode D2 is connected with the anode of the diode D3 and serves as the rectifier bridge power input end N, the cathode of the diode D4 is connected with the cathode of the diode D3 and serves as the rectifier bridge direct current output end + V, and the anode of the diode D1 is connected with the anode of the diode D2 and serves as the rectifier bridge direct current output end-V.
8. The dual protection system for realizing the dual voltage rectification dual power supply control of the welder power supply according to claim 1, is characterized in that: the voltage doubling unit comprises a capacitor C1, a capacitor C2, a resistor R1 and a resistor R2; one end of the capacitor C1 is connected with one end of the capacitor C2, one end of the resistor R1 and one end of the resistor R2 and serves as a control end of the voltage doubling unit, the other end of the capacitor C1 is connected with the other end of the resistor R1 and serves as an input end of the voltage doubling unit, and the other end of the capacitor C2 is connected with the other end of the resistor R2 and serves as an input end of the voltage doubling unit.
9. The dual protection system for realizing the dual voltage rectification dual power supply control of the welder power supply according to claim 8, is characterized in that: the voltage doubling unit further comprises a capacitor C3 and a capacitor C4, one end of the capacitor C3 is connected with one end of the capacitor C4 and serves as a control end of the voltage doubling unit, the other end of the capacitor C3 serves as an input end of the voltage doubling unit, and the other end of the capacitor C4 serves as an input end of the voltage doubling unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911160618.3A CN110932251A (en) | 2019-11-23 | 2019-11-23 | Dual protection system for realizing double-voltage rectification dual-power control of welding machine power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911160618.3A CN110932251A (en) | 2019-11-23 | 2019-11-23 | Dual protection system for realizing double-voltage rectification dual-power control of welding machine power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111790962A (en) * | 2020-06-28 | 2020-10-20 | 上海气焊机厂有限公司 | Dual-power-supply starting control method and device and welding machine |
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| CN103780105A (en) * | 2014-01-23 | 2014-05-07 | 上海沪工焊接集团股份有限公司 | Method and system for double-voltage automatic switching control |
| CN204391735U (en) * | 2014-12-30 | 2015-06-10 | 上海沪工焊接集团股份有限公司 | Welding machine electric power overvoltage crowbar |
| CN208767223U (en) * | 2018-06-05 | 2019-04-19 | 江苏恒信和安电子科技有限公司 | A kind of on-off control system |
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2019
- 2019-11-23 CN CN201911160618.3A patent/CN110932251A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103780105A (en) * | 2014-01-23 | 2014-05-07 | 上海沪工焊接集团股份有限公司 | Method and system for double-voltage automatic switching control |
| CN204391735U (en) * | 2014-12-30 | 2015-06-10 | 上海沪工焊接集团股份有限公司 | Welding machine electric power overvoltage crowbar |
| CN208767223U (en) * | 2018-06-05 | 2019-04-19 | 江苏恒信和安电子科技有限公司 | A kind of on-off control system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111790962A (en) * | 2020-06-28 | 2020-10-20 | 上海气焊机厂有限公司 | Dual-power-supply starting control method and device and welding machine |
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Application publication date: 20200327 |