Pulse generator for providing a plurality of pulses in determined phase positions

Claim 2

A pulse generator controlled by a signal derived from an AC control voltage and providing a plurality of pulses of determined phase position relative to said AC control voltage within a time interval determined by the cycle of the AC control voltage, said pulse generator comprising a bistable multivibrator having a set input, a reset input and a set output; an AND gate having a pair of inputs and an output connected to the reset input c of said bistable multivibrator; input means connected to the set input of said bistable multivibrator and one of the inputs of said AND gate for supplying to said set input a start signal derived from an AC control voltage and for supplying to said AND gate an auxiliary signal derived from said AC control voltage; a pulse generator having an output for producing a plurality of pulses; a switch having control means connected to the set output of said bistable multivibrator and selectively switched to conductive condition and nonconductive condition under the control of said bistable multivibrator; and a counter having an output connected to the other of the inputs of said AND gate and an input connected to the output of said pulse generator via said switch in a manner whereby when said switch is switched to its conductive condition by the output of said bistable multivibrator said pulse generator supplies pulses to said counter and said counter counts said pulses and supplies an output signal indicating the end of a counting cycle to said AND gate and when said auxiliary signal is supplied to said AND gate the output signal of said counter resets said bistable multivibrator and said switch is switched to its nonconductive condition and prevents the supply of pulses from said pulse generator to said counter.

Claim 3

A phase-shifting generator as claimed in claim 1, wherein said input means comprises fiRst and second pulse shapers, phase-shifting means for shifting a voltage, a source of AC control voltage coupled to said first pulse shaper via said phase means and coupled directly to said pulse shaper and applying said AC control voltage thereto, a first monostable multivibrator connected between said first pulse shaper and the set input of said bistable multivibrator and a second monostable multivibrator connected between said second pulse shaper and the one input of said AND gate, the operating times of said monostable multivibrators being shorter than the counting cycle of said counter.

Claim 4

A pulse generator as claimed in claim 1, wherein said counter comprises a binary counter having output means and an encoder connected to the output means of said counter for providing adjustable coding.

Claim 5

A pulse generator as claimed in claim 1, wherein said pulse generator, said bistable multivibrator, said AND gate and said counter comprise integrated circuits.

Claim 6

A pulse generator as claimed in claim 2, wherein said phase-shifting means comprises a phase shifter for shifting a voltage 180* in phase.

Claim 7

A pulse generator as claimed in claim 3, wherein said pulse generator, said bistable multivibrator, said AND gate, said counter and said encoder comprise integrated circuits.

Claim 8

In a welding controller, a pulse generator controlled by a signal derived from an AC control voltage and providing a plurality of pulses of determined phase position relative to said AC control voltage within a time interval determined by the cycle of the AC control voltage, said pulse generator comprising a bistable multivibrator having a set input, a reset input and a set output; an AND gate having a pair of inputs and an output connected to the reset input of said bistable multivibrator; input means connected to the set input of said bistable multivibrator and one of the inputs of said AND gate for supplying to said set input a start signal derived from an AC control voltage and for supplying to said AND gate an auxiliary signal derived from said AC control voltage; a pulse generator having an output for producing a plurality of pulses; a switch having control means connected to the set output of said bistable multivibrator and selectively switched to conductive condition and nonconductive condition under the control of said bistable multivibrator; and a counter having an output connected to the other of the inputs of said AND gate and an input connected to the output of said pulse generator via said switch in a manner whereby when said switch is switched to its conductive condition by the output of said bistable multivibrator said pulse generator supplies pulses to said counter and said counter counts said pulses and supplies an output signal indicating the end of a counting cycle to said AND gate and when said auxiliary signal is supplied to said AND gate the output signal of said counter resets said bistable multivibrator and said switch is switched to its nonconductive condition and prevents the supply of pulses from said pulse generator to said counter.

Claim 9

In a welding controller, a pulse generator controlled by a signal derived from an AC control voltage and providing a plurality of pulses of determined phase position relative to said AC control voltage within a time interval determined by the cycle of the AC control voltage, said pulse generator comprising a bistable multivibrator having a set input, a reset input and a set output; an AND gate having a pair of inputs and an output connected to the reset input of said bistable multivibrator; input means connected to the set input of said bistable multivibrator and one of the inputs of said AND gate for supplying to said set input a start signal derived from an AC control voltage and for supplying to said AND gate an auxiliary signal derived from said AC control voltage; a pulse generator having an output for producing a plurality of pulses; a switch having control means connected to the set output of said bistable multivibrator and selectively switched to conductive condition and nonconductive condition under the control of said bistable multivibrator; and a counter having an output connected to the other of the inputs of said AND gate and an input connected to the output of said pulse generator via said switch in a manner whereby when said switch is switched to its conductive condition by the output of said bistable multivibrator said pulse generator supplies pulses to said counter and said counter counts said pulses and supplies an output signal indicating the end of a counting cycle to said AND gate and when said auxiliary signal is supplied to said AND gate the output signal of said counter resets said bistable multivibrator and said switch is switched to its nonconductive condition and prevents the supply of pulses from said pulse generator to said counter.