Temperature abnormality detector for electronic apparatus
First Claim
1. A temperature abnormality detector for an electronic apparatus, comprising:
- a plurality of temperature sensors arranged near a heat-generating electronic part mounted on an electronic apparatus;
first discriminating means for determining a sensor failure when a temperature value measured by one selected temperature sensor from said plurality of temperature sensors is not set within a predetermined range;
second discriminating means for determining whether the measured temperature value reaches a first level set within the predetermined range and a second level set as a value larger than that of the first level;
third discriminating means for determining a sensor failure when the measured value reaches the second level without passing through the first level on the basis of an output from said second discriminating means;
switching means for switching said selected temperature sensor from said temperature sensors to another temperature sensor of said plurality of temperature sensors in response to sensor-failure outputs from said first and third discriminating means; and
halt means for interrupting power supply to said electronic part and halting said electronic apparatus when the measured temperature value reaches the first level and then the second level on the basis of an output from said second discriminating means.
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Accused Products
Abstract
According to this invention, in a temperature abnormality detector, an electronic apparatus can be continuously operated without halt, a failure of a sensor can be reliably detected, and power supply is interrupted to protect the electronic apparatus when the temperature of the electronic apparatus really reaches a high temperature. In addition, a highly reliable electronic apparatus which is not halted by erroneous detection can be provided, and repairing of the apparatus can be completed within a short time. Even when the apparatus fails, it can be easily restored.
The detector includes a plurality of temperature sensors arranged on an electronic part, a switching circuit for receiving output signals from the temperature sensors, a converting circuit for converting the output signals from the temperature sensors into temperature values, a microprocessor, output circuits of the microprocessor, and a ROM for storing a program for operating the microprocessor.
50 Citations
10 Claims
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1. A temperature abnormality detector for an electronic apparatus, comprising:
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a plurality of temperature sensors arranged near a heat-generating electronic part mounted on an electronic apparatus; first discriminating means for determining a sensor failure when a temperature value measured by one selected temperature sensor from said plurality of temperature sensors is not set within a predetermined range; second discriminating means for determining whether the measured temperature value reaches a first level set within the predetermined range and a second level set as a value larger than that of the first level; third discriminating means for determining a sensor failure when the measured value reaches the second level without passing through the first level on the basis of an output from said second discriminating means; switching means for switching said selected temperature sensor from said temperature sensors to another temperature sensor of said plurality of temperature sensors in response to sensor-failure outputs from said first and third discriminating means; and halt means for interrupting power supply to said electronic part and halting said electronic apparatus when the measured temperature value reaches the first level and then the second level on the basis of an output from said second discriminating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A temperature abnormality detector for an electronic apparatus, comprising:
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a temperature sensor arranged near a heat-generating electronic part mounted on an electronic apparatus; first discriminating means for determining a sensor failure when a temperature value measured by said temperature sensor does not fall within a predetermined range; second discriminating means for determining whether the measured temperature value reaches first level set within the predetermined range and second level set as a value larger than that of the first level; third discriminating means for determining a sensor failure when the measured value reaches the second level without passing through the first level on the basis of an output from said second discriminating means; and halt means for interrupting power supply to said electronic part and halting said electronic apparatus when the measured temperature value reaches the first level and then the second level on the basis of the output from said second discriminating means.
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Specification