Patent ID: 8890492

Claim:
An automatic start/stop device for an engine-driven power generator which includes an alternator driven by an engine, a rectifier for rectifying an output of the alternator, a DC/DC converter for converting a DC voltage output from the rectifier, and an inverter for converting an output of the DC/DC converter into an AC output to be a generator output, the engine-driven power generator further including an output terminal to connect a load, the inverter including an output line connected to the output terminal, the automatic start/stop device comprising: a load detection circuit connected to the output line of the inverter in parallel, and configured to detect connection and disconnection of the load to the output terminal of the generator, wherein the load detection circuit includes a load detection line connected to the output line of the inverter in parallel via a resistor, a power supply circuit for applying a voltage to only the load detection line, and a decision circuit for, when a current having a preset value or more flows through the load detection line due to occurrence of a closed circuit by the connection of the load to the output terminal, outputting a load detection signal, the resistor is set at a high resistance value which does not influence the load to which the generator output is supplied, and the power supply circuit forms a power supply from a battery in an independent system from a power generator system by the alternator such that the power supply circuit applies the voltage to the load detection line while the engine is stopped.