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US 5,499,201 AGranted
Method for reducing the electricity consumption of microprocessor-based apparatuses, in particular those for public telephone stations
OwnerJoel Wenger, Philippe Broccardinventors
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Abstract
The electricity consumption of a telephone kiosk is reduced when quiescent by a clock handler which varies the frequency of the pulses sent to the microprocessor for operating it.
Claims12
Process for reducing the average electrical energy consumption of a public telephone station subject to real-time constraints and equipped with a power reduction device comprising:
- a microprocessor, which microprocessor passes temporarily into an energy-saving inactive state;
- a system of oscillators providing clock pulses to the microprocessor,
- means for varying the clock frequency arriving at the microprocessor between a high frequency and a lower frequency, these means including:
- a fixed timebase providing the microprocessor with fixed timebase signals via a first line,
- a second line for transmitting the clock pulses to the microprocessor,
- means for interpreting a command from the microprocessor to a handler for making the system pass from the active state to the inactive state and vice versa,
- comprising the steps of:
- recognizing a need of the microprocessor to work at said high frequency;
- commuting to the high frequency;
- and
- applying the frequency to the microprocessor
8 more elements
Device for reducing the average electrical energy consumption of a public telephone station subject to real-time constraints comprising:
- a microprocessor, which microprocessor passes temporarily into an energy-saving inactive state;
- a system of oscillators providing clock pulses to the microprocessor,
- means for varying the clock frequency arriving at the microprocessor between a high frequency and a lower frequency, these means including:
- a fixed timebase providing the microprocessor with fixed timebase signals via a first line,
- a second line for transmitting the clock pulses to the microprocessor,
- means for interpreting a command from the microprocessor to a handler for making the system pass from the active state to the inactive state and vice versa, wherein the handler commutes to the high frequency after recognizing a need of the microprocessor to work at said high frequency, the frequency being applied to the microprocessor corresponding to its activity state.
3 more elements
Dependencies are inferred from the claim text.