Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1998-09-15
1999-12-14
Paschall, Mark
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219496, 219483, 219506, 392441, 392454, H05B 102
Patent
active
060021144
ABSTRACT:
A control device installed in an electric water heater to control its operation, the control device including a water temperature control circuit and a power control circuit, the water temperature control circuit being formed of a water temperature detection circuit, which detects water temperature at the water inlet and the water outlet of the electric water heater, a water flow rate detection circuit, which detects the flow rate of water passing through the water inlet, a CPU, an indicator circuit controlled by the CPU to indicate the working conditions of the electric water heater, and a digital display controlled by the CPU to show the value of water temperature at the water outlet, the power control circuit being formed of a power supply circuit, a TRAIC triggering control circuit, which turns on the heating elements of the electric water heater alternatively subject AC phase change, a TRAIC power circuit, which provides the TRAIC triggering control circuit with the base power, an AC phase detection input circuit, a relay circuit controlled by the CPU to cut off power supply from the electric water heater when an abnormal condition occurs, a failure detection circuit, which outputs a signal to the CPU when an abnormal condition of the electric water heater is detected, causing the CPU to cut off power supply from the electric water heater, and an overheat protection circuit for overheat protection.
REFERENCES:
patent: 5504306 (1996-04-01), Russell et al.
patent: 5784531 (1998-07-01), Mann et al.
patent: 5866880 (1999-02-01), Seitz et al.
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