Temperature controller having phase control and zero-cross cycle control functionality
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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Abstract
The present invention relates to a temperature controller having phase control and zero-cross cycle control function that can be achieved at a low cost by controlling power that is supplied to a load, by generating a phase control signal or a zero-cross control signal according to control target temperature of a load, using a microcomputer.
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5 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification