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Driving apparatus of a linear compressor

  • US 6,832,898 B2
  • Filed: 12/09/2002
  • Issued: 12/21/2004
  • Est. Priority Date: 12/10/2001
  • Status: Expired due to Term
First Claim
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1. A driving apparatus of a linear compressor for driving a piston in a cylinder by a linear motor to generate compressed gas, comprisingan inverter for outputting alternating current which is supplied to said linear motor, a direct current power source for supplying direct current voltage to said inverter, current value commanding means for determining and commanding magnitude of said alternating current, electric power detecting means for detecting input electric power which is supplied to said linear compressor, driving frequency determining means for varying driving frequency of said inverter such that the electric power detected by said electric power detecting means becomes maximum, current waveform commanding means for generating command current waveform from a command current value from said current value commanding means and from a driving frequency determined by said driving frequency determining means, inverter control means for sending a control signal to said inverter based on the command current waveform from said current waveform commanding means, current detecting means for detecting a smoothened value of saw tooth-like inverter input current as input current or detecting a peak value as output current, and voltage detecting means for detecting input voltage of said inverter, wherein said electric power detecting means calculates input electric power which is supplied to said linear compressor from current detected by said current detecting means and voltage detected by said voltage detecting means, said inverter control means sends a control signal to said inverter such that a deviation between a command current value from said current value commanding means and a detection current value from said current detecting means is reduced.

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