Abstract: A control system is provided for the accurately timed control of switching inverter circuitry; for example, an inverter that produces a 115VAC/60HZ output from a 12 V DC source such as a vehicle battery. The control system utilizes an internal reference source and supervisory control circuitry to determine accurate and orderly start up, shut down, control of the inverter switching elements and automatic shut down upon the occurrence of predetermined sensed conditions including low input voltage from the source and excessive output current through the load. The switching elements of the inverter are each controlled to produce respective outputs of predetermined active/inactive duty cycles each switching cycle with an accurate inactive period being established between the active periods of each switching element.