JP2013089788A5 - - Google Patents

Description

Then, the control circuit 15 is instructed to control means in the claims, the selection circuit 18 and the LUT 17 are instructed to generate pulse frequency modulation control information in the claims, and the LUT 17 is instructed to memory means in the claims. The pulse generation circuit 19 corresponds to the command pulse generation means in the claims, and the gate pulse generation circuit 20 and the gate drive circuits 16a and 16b correspond to the inverter drive means in the claims.

Claims (6)

An inverter for power conversion that outputs a high-frequency voltage pulse for laser oscillation to the laser oscillator, and a control means for controlling the operation of the inverter;
The control means includes pulse frequency modulation control information generating means for generating information for performing pulse frequency modulation control of the carrier frequency of the voltage pulse according to the processing conditions of the workpiece;
Command pulse generating means for generating pulse frequency modulated command pulses reflecting the pulse frequency modulation control information generated by the pulse frequency modulation control information generating means;
Inverter driving means for controlling on / off of the switching element of the inverter based on the command pulse generated by the command pulse generating means, and outputting the voltage pulse whose pulse frequency is modulated from the inverter by driving the inverter driving means. Power supply device for laser processing machines. The pulse frequency modulation control information generating means is a memory means in which information for setting the relationship between the time and the carrier frequency for pulse frequency modulation control of the carrier frequency of the voltage pulse in accordance with the processing conditions of the workpiece is registered in advance. The power supply device for a laser beam machine according to claim 1, comprising: The pulse frequency modulation control information generating means generates information for pulse frequency modulation control every time a series of voltage pulses corresponding to one laser pulse is output from the inverter in accordance with the workpiece material of the workpiece. The power supply device for a laser beam machine according to claim 1 or 2, wherein: When the carrier frequency of the voltage pulse output by the pulse frequency modulation from the inverter based on the pulse frequency modulation control information from the pulse frequency modulation control information generating means is higher than a predetermined frequency, the command 4. The laser processing machine according to claim 1, wherein the pulse generating means lengthens the pulse width of only the initial rising pulse in the series of command pulses corresponding to one pulse of the laser pulse. 5. Power supply. 2. The pulse frequency modulation control information generating means generates pulse frequency modulation control information such that a carrier frequency of the voltage pulse gradually decreases from a frequency higher than a resonance frequency of the laser oscillator. The power supply device for laser processing machines of any one of Claim 4. 2. The pulse frequency modulation control information generating means generates pulse frequency modulation control information such that a carrier frequency of the voltage pulse gradually increases from a frequency lower than a resonance frequency of the laser oscillator. The power supply device for laser processing machines of any one of Claim 4.