Digital firing control for thyristor current regulator - uses processor to feed reference value representing firing interval to pulse counter for initiating firing

摘要

The regulator for an electrical machine has a digital firing control using a processor (1), a pulse source (2) with a preset HF clock frequency and a resettable pulse counter (3). The latter has a read input for entering reference count value (SO) and an output (7) providing an interrupt signal when the count reaches this value (SO). The latter is supplied by the Processor (1), which also receives the interrupt signal. The processor calculates the reference count value (SO), fed to the pulse Counter (3) and representing the interval between the firing commands, in deoendance on supplied control parameters . It responds to each received interrupt signal to provide a firing command and to supply the updated reference count value (30) to the counter (3), which is reset as each interrupt signal is suPPlied.