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Soft switch welding inverter, phase-shifting control method and soft switching method

An inverter power supply, phase-shift control technology, applied in welding equipment, irreversible DC power input conversion to AC power output, electrical components, etc. The effect of reliable operation

Inactive Publication Date: 2009-07-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Many existing improved full-bridge soft-switching circuit topologies broaden the zero-voltage soft-switching load range of the two arms or adopt zero-current soft switching for the lagging arm, but few of them can realize the full-load range of the two arms including the no-load state. Soft Switching of Power Switching Devices

Method used

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  • Soft switch welding inverter, phase-shifting control method and soft switching method
  • Soft switch welding inverter, phase-shifting control method and soft switching method
  • Soft switch welding inverter, phase-shifting control method and soft switching method

Examples

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Effect test

Embodiment 1

[0055] This embodiment provides a soft switching welding inverter power supply, such as figure 2 As shown, it includes a full bridge converter 201 and a control module 202 .

[0056] A full-bridge converter 201, configured to work according to the driving signal generated by the control module 202;

[0057] The control module 202 is used to receive the current signal of the full-bridge converter 201, and adjust the dead time of the phase-shift signal according to the current signal. The adjusted phase-shift signal is a control signal, and the control signal is isolated and amplified to form a drive signal Drive the full bridge converter 201 to work.

[0058] The circuit topology of the full bridge converter 201 is as follows image 3 Shown:

[0059] The first absorbing capacitor C1 and the third absorbing capacitor C3, C1 is connected in parallel to the first switching device Q1 of the super forearm, and C3 is connected in parallel to the third switching device Q3 of the s...

Embodiment 2

[0073] This embodiment provides a soft switching welding inverter power supply, such as figure 2 As shown, it includes a full bridge converter 201 and a control module 202 . The circuit topology of the full bridge converter 201 is as follows Figure 7 Shown:

[0074] The first absorbing capacitor C1 and the third absorbing capacitor C3, C1 is connected in parallel to the first switching device Q1 of the super forearm, and C3 is connected in parallel to the third switching device Q3 of the super forearm, and C1 and C3 are used to jointly realize full switching of Q1 and Q3 Approximate zero-voltage shutdown of the load range;

[0075] The super-forearm auxiliary resonant network includes two series-connected auxiliary resonant capacitors Ca1 and Ca3 connected in parallel on the super-forearm, an auxiliary resonant inductor La1 connected to the midpoint of the super-forearm Q1 and Q3 and two series-connected auxiliary resonant capacitors Ca1 and Ca3 The middle point is used t...

Embodiment 3

[0082] This embodiment provides a phase-shift control method, which is applied to the soft-switching welding inverter power described in Embodiment 1 and Embodiment 2. Here, the soft-switching welding inverter power supply in Embodiment 1 is taken as an example.

[0083] In the full-bridge converter with phase-shift control, the realization of soft switching requires that the dead time of switching devices of the leading arm and the lagging arm be coordinated with the energy in the circuit, and the phase-shift control method of adaptive adjustment of the dead time is It means that the switching dead time of the power switching device of the advanced forearm and the lagging arm decreases with the increase of the transformer current (such as the primary current of the transformer or the output current of the power supply), and the dead time of the advanced forearm has a large adjustment range, while The adjustment range of the dead time of the lagging arm is small, and the laggi...

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Abstract

The invention discloses a soft-switching welding inverter power supply, a phase-shifting control method and a soft-switching method which belong to the electronic circuit field. The soft-switching welding inverter power supply comprises a full-bridge converter and a control module; the phase-shifting control method is applied to the power supply, and comprises the steps as follows: the control module receives current signals of the full-bridge converter, and adjusts dead-zone time of phase-shifting signals based upon the current signals; the soft-switching method is applied to the power supply, and comprises the steps as follows: an auxiliary resonant network is connected with a bridge leg of the power supply in parallel so as to provide subsidiary energy to the zero voltage turning-on of a switching element; before the switching element of a lagging leg on the full-bridge converter is turned off, main power loop current flowing through the switching element is weakened, and the reversion of the main power loop current is restrained; and an absorption capacitor is connected with the switching element in parallel, and the borne rate of voltage rise is slows down when the switching element is turned off. The soft-switching welding inverter power supply, the phase-shifting control method and the soft-switching method realize the zero-voltage zero-current soft-switching in full range of loads including idle load and short circuit.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a soft-switch welding inverter power supply, a phase-shift control method and a soft-switch method. Background technique [0002] Ordinary bipolar control full-bridge power converter, regardless of whether the transformer secondary adopts full-wave rectification, bridge rectification, or current doubler rectification, such as figure 1 As shown, it uses the traditional PWM (Pulse Width Modulation, pulse width modulation) control technology to realize the output characteristic control of the power supply. The switching loss not only reduces the efficiency of the power supply, but also generates large EMI (ElectroMagnetic Interference, electromagnetic interference), which affects the reliability of the power supply. [0003] Combining soft switching technology with inverter technology is one of the important development directions of welding power supply. Realizing the soft swit...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M1/36B23K9/10
CPCY02B70/1491Y02B70/10Y02P70/10
Inventor 朱志明赵港
Owner TSINGHUA UNIV
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