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Engine generator

  • US 9,837,941 B2
  • Filed: 05/30/2014
  • Issued: 12/05/2017
  • Est. Priority Date: 08/30/2013
  • Status: Active Grant
First Claim
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1. An engine generator comprising:

  • an engine;

    a generator configured to be driven by the engine;

    a rectifier configured to rectify an output from the generator;

    an inverter configured to convert a DC power from the rectifier into an AC power; and

    a power storage device provided in parallel with the generator in a path from the rectifier to the inverter, the power storage device including a charging conductor and a discharging conductor,wherein the engine generator controls conduction of the charging conductor and the discharging conductor so as to control charge/discharge of the power storage device,wherein a DC voltage in the path from the rectifier to the inverter is detected in controlling the charge/discharge,wherein a duty ratio in switching control of the charging conductor of the power storage device is set higher than a duty ratio in the switching control of the discharging conductor of the power storage device when the DC voltage is higher than a value obtained by adding a dead zone range to a target voltage of the DC voltage,wherein the duty ratio in the switching control of the discharging conductor of the power storage device is set higher than the duty ratio in the switching control of the charging conductor of the power storage device when the DC voltage is lower than a value obtained by subtracting the dead zone range from the target voltage, andwherein a load power is detected so as to change the dead zone to a value relative to the load power with a delay corresponding to a time constant not less than a predetermined value.

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