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Method and apparatus for heater current control for automatic vending machine

  • US 4,915,162 A
  • Filed: 08/03/1989
  • Issued: 04/10/1990
  • Est. Priority Date: 09/10/1985
  • Status: Expired due to Fees
First Claim
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1. A method for controlling a heater current in an automatic vending machine including a heater, and a motor-driven compressor for refrigeration, characterized by:

  • detecting an amount of current flowing in said compressor;

    determining when said compressor is being started, based on the amount of detected current flowing in said compressor;

    terminating a flow of current to said heater when an effective value of the detected current flowing in said compressor exceeds a predetermined value; and

    phase controlling the current flowing in said heater when said compressor is being operated stably, such that the sum of an effective current flowing in said compressor and an effective current flowing in said heater does not exceed a predetermined value.

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