Importance

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Abstract

A data protection and recovery system for an energy controller for a water heater is disclosed. The energy controller is a microprocessor based system which includes a central processing unit, volatile and non-volatile memories, and a clock. It functions to energize the water heater only during a certain period of the day. During normal operation of the system, the system uses the volatile memory as a workspace, and normally copies data in the volatile memory to the non-volatile memory. The system senses electrical disturbances, such as power surges, and prevents the writing of any data to the non-volatile memory components during the electrical disturbance. After the electrical disturbance subsides, the system checks the integrity of the data written to the volatile memory, and if it was not corrupted by the electrical disturbance, the data is then written to the non-volatile memory. If the data in the volatile memory was corrupted by the electrical disturbance, the system copies the data from the non-volatile memory to the volatile memory, and the system is restarted.

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First Claim