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Alternating current system resistance welding control unit and alternating current system resistance welding measurement equipment
Alternating current system resistance welding control unit and alternating current system resistance welding measurement equipment
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机译：交流系统电阻焊接控制单元和交流系统电阻焊接测量设备
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摘要
PURPOSE: To ensure reliability of welding control or welding measurement by generating a stable clock to maintain specified frequency and phase even if the AC voltage on a power source line is changed and a voltage waveform is disturbed at a factory, etc. ;CONSTITUTION: A clock generation part is constituted of a control transformer 42 where a primary coil is connected to the power source line 10, a synchronizing pulse generation circuit 44 which forms a waveform of the AC voltage obtained on a secondary coil of this control transformer 42 and outputs a synchronizing pulse SP corresponding to the waveform of the power source line voltage and a PLL circuit 50 which makes the synchronizing pulse into an input signal. This PLL circuit 50 is different from a general PLL circuit, the speed of response of a phase comparator 52 and a low-pass filter 54 is made low, further, 8, loop gain amplifier circuit, etc., are not used and followability of an output signal for the input signal is made low. Clocks CK outputted from the PLL circuit 54 are supplied to an electric current effective value arithmetic circuit 30, a welding current control part 34, a sequence control part 38, a power factor angle and energizing angle measuring part 40, etc.;COPYRIGHT: (C)1993,JPO&Japio
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