Driving circuit and inverter power supply

Abstract

The invention discloses a driving circuit and an inverter power supply. The driving circuit comprises a pulse width control module and a main driving module; a pulse width signal input end of the pulse width control module and a first pulse signal input end of the main driving module are electrically connected and are both used for receiving a first pulse signal; a pulse width signal output end ofthe pulse width control module is electrically connected with a second pulse width signal input end of the main driving module, and the pulse width control module converts the first pulse signal intoa second pulse signal and outputs the second pulse signal to the main driving module; the main driving module is used for generating a third pulse signal according to the first pulse signal and the second pulse signal, and the third pulse signal is output by the output end of the main driving module; the pulse width of the third pulse signal is determined by the first pulse signal and the secondpulse signal. According to the technical scheme provided by the embodiment of the invention, a driving signal (namely the third pulse signal) provided by the driving circuit for a BOOST main loop canbe matched with a working frequency of the BOOST main loop.

Description

Technical field [0001] The embodiment of the present invention relates to the technical field of inverter welding and cutting power supply control, in particular to a drive circuit and an inverter power supply. Background technique [0002] With the wide application of inverter welding and cutting power supplies, the current distortion problem caused by the inverter power supply to the power grid becomes more prominent. Active Power Factor Correction (PFC) technology is one of the most effective solutions. [0003] Generally, under the condition of high input grid voltage (such as 575Vac single-phase or three-phase grid voltage), the standard BOOST main loop output voltage can be designed to be as high as 950V or more +BUS voltage output. At this time, the power tube in the BOOST main loop needs to withstand voltage above 1200V; or use a complex topology to reduce the withstand voltage requirement of the power tube, so as to select a MOSFET or high-speed IGBT tube with a withstand ...

AI Technical Summary

Problems solved by technology

However, the high-voltage high-power IGBT has a long turn-off time and low operating frequency; when the active PFC technology is integrated into the inverter power supply, the operating frequency of the standard BOOST main circuit (also called a boost chopper) and The high pulse duty cycle of standard active PFC chips is difficult to match

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