Method and apparatus for randomly delaying a restart of electrical equipment

• US 4,749,881 A
• Filed: 05/21/1987
• Issued: 06/07/1988
• Est. Priority Date: 05/21/1987
• Status: Expired due to Term

• Current Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: Uhrich, Daniel T.
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): IP, SHIK LUEN PAUL
• Application Number:
  US07/052,804
• Time in Patent Office: 383 Days
• Field of Search: 307/34, 307/35, 307/37, 307/38, 307/39, 307/40, 307/41, 307/115, 307/116, 307/117, 307/132 R, 307/132 E, 307/141, 307/141.4, 361/28, 236/46 R, 236/46 F, 236/46 A, 236/46 E, 236/46 C, 236/74 A, 236/78 B, 236/78 C, 236/78 D, 62/155-158, 62/168, 62/182, 62/231, 62/227, 62/228.1
• US Class Current: 307/41
• CPC Class Codes: G05D 23/1912 whose output amplitude can take more than two discrete values

Abstract

A method for randomly delaying a restart of electrical equipment following an availability of power for energizing the equipment includes the steps of measuring an environmental temperature, e.g., the room where the electrical equipment is located, converting a predetermined fractional portion of the value of the sensed temperature to a number and using the number following an availability of power for energizing the equipment after a time period having a duration restarting the equipment. An apparatus employing this method includes a restart control, a temperature sensor and an equipment start programmer responsive to the temperature sensor and connected to the restart control for producing a restart control energizing signal dependent on a predetermined fractional portion of the value of the sensed temperature.

Claims

1. A method of randomly controlling a restart of electrical equipment following an availability of power for energizing the equipment including the steps of measuring the temperature of a preselected environment, converting a predetermined fractional portion of the value of the measured temperature to a integer, utilizing the integer to set a timer to operate during a time period having a duration corresponding to the integer, and generating an energizing signal for the electrical equipment upon the expiration of an operation of the timer from the set condtion at the end of the time period.

2. A method as set forth in claim 1 wherein the preselected environment is an interior of an enclosure containing the electrical equipment.

3. A method set forth in claim 1 wherein converting of a predetermined portion includes an analog-to-digital conversion of the measured temperature to a corresponding digital word and utilizing the integer includes selecting the least significant bits of the digital word from the conversion to set a count in the timer and allowing the timer to count clock signals to countdown from the count to a zero count to define the timer period representing an expiration of the operation of the timer from the set count condition.

4. An apparatus for randomly restarting electrical equipment following an availability of electrical power for energizing the equipment comprising

a restart control for the equipment,

a temperature sensor and

an equipment start programmer means responsive to said temperature sensor and connected to said restart control for producing a restart control energizing signal after a time period having a duration dependent on a predetermined fractional portion of the value of the sensed temperature.

5. An apparatus as set forth in claim 4 wherein said equipment start programmer includes an analog-to-digital converter means for converting a temperature representative signal from said sensor to a digital word, a clock signal source, a timer counter arranged to count clock signals from said source and to produce the energizing signal upon the expiration of a count operation from a preset count state and means for presetting a count in said counter representative of the least significant bits in said digital word.

6. An apparatus as set forth in claim 5 wherein said sensor is arranged to measure an environmental temperature of the electrical equipment.

7. An apparatus for randomly restarting each of a plurality of electrical equipment supplied with power from a common power input comprising

a separate restart control for each of the plurality of electrical equipment,

a plurality of temperature sensors with each of said sensors measuring a temperature of a preselected environment and

a plurality of equipment start programmer means with each of said programmer means being responsive to a respective one of said sensors and connected to a respective one of said restart controls for producing a restart control energizing signal dependent on a predetermined portion of the value of the temperature sensed by a respective one of said sensors.

8. An apparatus as set forth in claim 7 wherein each of said programmer means includes an analog-to-digital converter means for converting a temperature representative signal from the respective one of said sensors to a digital word, a clock signal source, a timer counter arranged to count clock signals from said source and to produce the energizing signal upon the expiration of a count operation from a preset count state and means for presetting a count in said counter representative of the least significant bits in said digital word.

9. An apparatus as set forth in claim 7 wherein each of said sensors is arranged to measure an environmental temperature of a corresponding one of the plurality of electrical equipment.