Arrangement for providing triggering pulses to a phase-gating-controlled rectifier

摘要

The invention relates to an arrangement for providing triggering pulses for a phase-gating-controlled rectifier for voltage regulation in the case of undervoltage and maximum conducting period, in the case of which a signal for time-related production of triggering pulses for the rectifier is obtained by analog comparison of a control variable (which is derived from the difference between a regulating variable and a reference variable) with a ramp function, and in the case of which means are provided for reliable triggering of the rectifier even in the event of undervoltage and the control variable falling below a defined limiting value in the control range. In order to achieve better utilisation of the maximum possible control range (conducting period) without limiting the operating reliability, it is proposed according to the invention that digital triggering-angle limiting be carried out for maximum current flow, in the case of which a defined digital signal (g) is obtained from the synchronising clock (e) for the ramp generator (108), which digital signal (g) directly initiates the triggering pulses (h) of a triggering-pulse forming stage (104) from the analog comparison, in the event of the signal (d) failing. <IMAGE>