A power supply for a generator control circuit comprising: a generator that includes a permanent magnet generator and a main generator; a low-power bias supply comprising a first input and a first output, the first input coupled to an output of the permanent magnet generator and the first output coupled to a valve circuit, wherein the valve circuit controls a speed of the generator; a generator control unit, GCU, main internal power supply comprising a second input and a second output, the second input coupled to the output of the permanent magnet generator and the second output coupled to the valve circuit; and a controller configured to: monitor a characteristic associated with the generator, wherein the characteristic associated with the generator comprises an output voltage, or wherein the characteristic associated with the generator comprises a generator shaft speed, or wherein the characteristic associated with the generator comprises a frequency of the generator; cause the low-power bias supply to provide power to the valve circuit during a boot up period of the generator when the characteristic of the generator is within a first range of characteristic values until the GCU main internal power supply has sufficient voltage to operate after the boot up period; and cause the GCU main internal power supply to provide power to the valve circuit after the boot up period when the characteristic of the generator is within a second range of characteristic values. a generator that includes a permanent magnet generator and a main generator; a low-power bias supply comprising a first input and a first output, the first input coupled to an output of the permanent magnet generator and the first output coupled to a valve circuit, wherein the valve circuit controls a speed of the generator; a generator control unit, GCU, main internal power supply comprising a second input and a second output, the second input coupled to the output of the permanent magnet generator and the second output coupled to the valve circuit; and a controller configured to: monitor a characteristic associated with the generator, wherein the characteristic associated with the generator comprises an output voltage, or wherein the characteristic associated with the generator comprises a generator shaft speed, or wherein the characteristic associated with the generator comprises a frequency of the generator; cause the low-power bias supply to provide power to the valve circuit during a boot up period of the generator when the characteristic of the generator is within a first range of characteristic values until the GCU main internal power supply has sufficient voltage to operate after the boot up period; and cause the GCU main internal power supply to provide power to the valve circuit after the boot up period when the characteristic of the generator is within a second range of characteristic values. monitor a characteristic associated with the generator, wherein the characteristic associated with the generator comprises an output voltage, or wherein the characteristic associated with the generator comprises a generator shaft speed, or wherein the characteristic associated with the generator comprises a frequency of the generator; cause the low-power bias supply to provide power to the valve circuit during a boot up period of the generator when the characteristic of the generator is within a first range of characteristic values until the GCU main internal power supply has sufficient voltage to operate after the boot up period; and cause the GCU main internal power supply to provide power to the valve circuit after the boot up period when the characteristic of the generator is within a second range of characteristic values.