Method for controlling or regulating using the multi-cycle control principle and a device for carrying out the method

摘要

A method for controlling or regulating using the multi-cycle control principle, by means of one (a plurality of) AC actuator(s), which is (are) individually located in the load circuit with a common power source, having a device in which a comparator (K) is allocated to each AC actuator (St), the first input (k1) of which comparator (K) is supplied with a control variable or a level variable and whose comparator input (k2) is supplied with rectangular or triangular-waveform signals having the same frequency for each AC actuator, but a different phase relationship, furthermore having a control-pulse transmitter (IG) to which the output signals of the comparator are supplied via switching logic (L) which is synchronised to the power source. The sinusoidal beats of the load current(s) (i) is (are) raised to the full value of the current half-cycles in steps in each case when the phase-gating control is switched on, and is (are) reduced in steps to zero on switching off, two half cycles of one period (TN) of the AC voltage (uN) of the power source being gated at identical control angles ( alpha ) in each step, with the aid of a signal delay stage (SV) consisting of a phase-gating control section (Ph) and a timer (Z) using which the rate of change of the gating angle ( alpha ) can be set during the raising and lowering control, which signal delay stage (SV) is arranged in the signal paths between the switching logic (L) and the control pulse transmitter (Fig. 1). <IMAGE>