Classifications

• • 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
  • B23K9/1056—Power supply characterised by the electric circuit by using digital means
• • 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
  • B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
  • B23K9/073—Stabilising the arc

Definitions

• the present invention relates to an apparatus for generating an arc, and more particularly to a welding machine equipped with an inverter circuit.
• PWM pulse width modulation
• a first switching circuit 131 and a second switching circuit 132 are connected in parallel between the output terminals of a first rectifier 101 for rectifying three-phase or single-phase AC input.
• the first switching circuit 131 is configured by connecting the first switching element 102 and the second switching element 104 in series.
• the connection point between the first switching element 102 and the second switching element 104 is a circuit output terminal 133 of the first switching circuit 131.
• First reverse diode 103 and second reverse diode 105 are connected in parallel to first switching element 102 and second switching element 104, respectively.
• the second switching circuit 132 is configured by connecting in series a third switching element 106 and a fourth switching element 108.
• a welding machine having an output detector for detecting the output of the second rectifier, and an error amplifier for amplifying an error between an output signal from the output detector and the output setting signal;
• a drive circuit that varies a timing of outputting a control signal according to a power error amplification signal; and a first one that receives a control signal and outputs a switching signal that drives a first switching element and a second switching element With the drive of And a second drive unit for inputting a control signal and outputting a switching signal for driving the third switching element and the fourth switching element.
• the second drive unit is configured to turn on the first switching element.
• the second switching element is configured to output a switching signal that switches the fourth switching element to the on state power off state at a timing different from the timing at which the first drive unit outputs the switching signal to switch the state to the off state.
• a first switching element connected in parallel between a first rectifier for rectifying an AC power input and a first reverse diode connected between the output of the first rectifier.
• a third switching circuit connected between the output of the first rectifier and a first switching circuit formed by series connection of a second switching element in which a second reverse diode is connected in parallel with a second switching element, and A second switching circuit configured by series connection of a third switching element in which a reverse diode is connected in parallel and a fourth switching element in which a fourth reverse diode is connected in parallel; and one of the primary side coils Is connected to the connection between the first switching element and the second switching element, and the other end of the primary coil is connected to the connection between the third switching element and the fourth switching element.
• a first switching element in which a first reverse diode connected in parallel between a first rectifier for rectifying an AC power input and an output of the first rectifier. And a third reverse diode connected between the output of the first rectifier and a first switching circuit configured by series connection of a second switching element and a second switching element in parallel with the second reverse diode.
• FIG. 2 is a block diagram showing a circuit configuration of a welding machine according to a second embodiment of the present invention.
• FIG. 8 is a block diagram showing a circuit configuration of a welding machine of an eighth embodiment of the present invention.
• FIG. 10 is a block diagram showing a circuit configuration of a conventional welding machine.
• FIG. 11 is a timing chart showing inverter operation by partial resonance control of a conventional welding machine.
• the second reverse diode 5 Since the current flowing in the circuit has a minute value, the heat generation of the power semiconductor (including the second switching element 4 and the second reverse diode 5) is suppressed.
• the timing relationship between the first switching element and the fourth switching element with respect to the timing at which each switching element is switched to the on state / off state may be used. In that case, the same effect can be obtained for the switching element having a different timing relationship.
• the second switching element 4 and the third switching element 6 are input.
• the first drive unit 17 is the first switching element 2
• the second drive unit 18 is the fourth switching element 8
• the third drive unit 21 is the second switching element 4.
• the fourth drive unit 22 controls the third switching element 6.
• the drive circuit 316 to the first drive unit 17 and the second drive unit 18 have the same timing for turning on the first and fourth switching elements at the same timing.
• the drive circuit 316 sends a control signal S3 for turning off the first switching element 2 to the first drive unit 17.
• the fourth switching element 8 is turned off with respect to the second drive unit 18.
• Send control signal S4. Similarly, the control signals S5 and S6 for turning on the second and third switching elements at the same timing from the drive circuit 316 to the third drive unit 21 and the fourth drive unit 22 respectively. send.
• the current to the reverse diode is suppressed. It is possible to realize a highly reliable welder by suppressing the heat generation of the power semiconductor and generating the back electromotive force generated by the transformer 10 to suppress the surge voltage applied to the switching element. Can.
• the timing relationship between the first switching element and the fourth switching element or the second one regarding the timing at which each switching element is switched to the on state force off state Only one of the differences in the timing relationship between the switching element and the third switching element may be used. In that case, the same effect can be obtained for the switching element having a different timing relationship.
• the control signal S3 from the drive circuit 316 to the first drive unit 17 and the control signal S4 to the second drive unit 218 are output at the same timing, Also, the control signal S5 to the third drive unit 21 and the control signal S6 to the fourth drive unit 222 are output at the same timing.
• the timing at which the first switching circuit 19 and the second delay circuit 23 output a switching signal to switch the fourth switching element 8 to the on state force is referred to as the first switching element. Delay until the switching surge current generated in 2 disappears.
• the timing at which the switching signal for switching the third switching element 6 to the on-state power state is also output is delayed until the predetermined time for the switching surge current generated in the second switching element 4 to disappear.
• the delay circuits 19 and 23 use timers configured with an integrated circuit to change the delay time, or by changing their constants using a time constant circuit consisting of a resistor and a capacitor. There is a means for changing the charge / discharge time to change the delay time.
• the current to the reverse diode can be suppressed, the heat generation of the power semiconductor can be suppressed, and the back electromotive voltage generated in transformer 10 can be reduced.
• the surge voltage applied to the switching element By suppressing the surge voltage applied to the switching element, a highly reliable welding machine can be realized.
• FIG. 8 is a block diagram showing a circuit configuration of a welding machine according to an eighth embodiment of the present invention.
• the same components as those in Embodiment 7 are assigned the same reference numerals and detailed explanations thereof will be omitted.
• the difference from the seventh embodiment is that the first delay circuit 19 is formed inside the fifth drive section 224.
• the second delay circuit 23 is formed inside the sixth driver 225.
• the control signal S1 output from the drive circuit 16 is input to the fifth drive unit 224.
• the timing to output a switching signal to switch the fourth switching element 8 to the off state is the first switching element. It can be delayed by the first delay circuit 19 until a predetermined time for the switching surge current generated in the slave 2 to disappear.
• the control signal S 2 from the drive circuit 16 is input to the sixth drive unit 225. Then, after the sixth driver 225 outputs the switching signal for switching the second switching element 4 to the off state, the timing at which the switching signal for switching the third switching element 6 to the off state is output is the second switching. It can be delayed by the second delay circuit 23 until the predetermined time for the switching surge current generated in the element 4 to disappear.
• the current to the reverse diode can be suppressed, the heat generation of the power semiconductor can be suppressed, and the counter electromotive voltage generated in transformer 10 can be generated.
• the surge voltage applied to the switching element By suppressing the surge voltage applied to the switching element, a highly reliable welding machine can be realized.
• the heat generation of the power semiconductor is suppressed by suppressing the current to the reverse diode, and the surge voltage applied to the switching element is suppressed by regenerating the counter electromotive voltage generated at transformer 10.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Plasma & Fusion (AREA)
• Mechanical Engineering (AREA)
• Arc Welding Control (AREA)
• Electronic Switches (AREA)
• Generation Of Surge Voltage And Current (AREA)

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• 2006
  • 2006-04-10 CN CN 200680000193 patent/CN100496848C/zh active Active
  • 2006-04-10 WO PCT/JP2006/307530 patent/WO2006115020A1/ja active Application Filing
  • 2006-04-10 JP JP2006527192A patent/JP4492613B2/ja active Active

Patent Citations (3)

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