Thermal protection apparatus for a secure electronic appliance, in particular a postage meter
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United States of America Patent
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-
Aug 19, 1997
Grant Date -
N/A
app pub date -
Nov 30, 1994
filing date -
Dec 1, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The apparatus detects the fact that a predetermined temperature threshold, in particular a low temperature threshold, has been crossed, and prevents any subsequent use of the appliance. The apparatus includes a reversible thermostatic switch capable of changing from a first stable state to a second stable state, and of delivering an alarm signal when it finds itself in the second state; and control means co-operating with the switch to respond to the alarm signal by delivering a disable signal for disabling the electronic appliance. According to the invention, the apparatus further includes a DC voltage source (15), an electrical or electronic component (17) capable of taking two states corresponding to said first and second stable states connected in a loop with the voltage source and the switch so that a current passing through the thermostatic switch causes a change from the first state to the second state.
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