SCR Voltage Regulators for Mobile Power Generation

Some SCR voltage regulator circuits for 28-volt dc mobile power generating systems are described. With special generator-regulator combinations the problems of self-buildup and radio-frequency interference are solved. To avoid radio noise, synchronous switching is used. Self-buildup is achieved with extra generator windings, generating the excitation power at a higher voltage, and with a SCR cascade, reducing the power level for the firing circuit. For higher residual voltage a circuit without extra windings is given.