Control device for an electric water heater
US6002114A · kind A · utility
Inventor
Key dates
| Filing date | Sep 15, 1998 |
| Grant date | Dec 14, 1999 |
| Priority date | — |
| Expiry date | Sep 15, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24H15/414
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
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 ou…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.