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Temperature controller having phase control and zero-cross cycle control functionality

  • US 8,645,000 B2
  • Filed: 09/08/2009
  • Issued: 02/04/2014
  • Est. Priority Date: 09/27/2008
  • Status: Active Grant
First Claim
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1. A temperature controller having phase control and zero-cross cycle control function that controls a load at a preset target temperature by performing phase control or zero-cross control on power supplied to a load after sensing and analyzing temperature of the load with a temperature sensor, the temperature controller comprising:

  • a power supply synchronization circuit part that extracts a synchronization signal from an AC power;

    a power circuit part in which an AC power supply is connected to a first coil of a transformer, and a drive power generation part and a triac trigger power generation part are respectively furnished on a second coil;

    a microcomputer that generates a phase control signal to supply power to the load only for time that is proportioned to a control output value in half-cycle of a power frequency, by using the half-cycle of the power frequency as a control cycle or a zero-cross cycle control signal to supply power to the load only for time that is proportioned to a control output value in a control cycle by using a predetermined cycle of power frequency as the control cycle, to analyze temperature of the load sensed by a temperature sensor and control the temperature to target temperature; and

    a triac drive part that applies power generated from the trigger power supply generation part as a trigger signal to a gate of a triac connected to the load in accordance with a phase control signal or a zero-cross cycle control signal of the microcomputer.

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