Energy management circuit

Patent · Tue Oct 15 04:00:00 EDT 1985

OSTI ID:5745990

Corless, R W

An energy management circuit for use in a telephone or other device which includes an electronic memory is disclosed. The invention provides a capacitive keep alive power supply to maintain said memory in an active condition during extended periods when the device is disconnected from a line power source, as in a telephone on-hook condition. A large capacitor charge is maintained within a predetermined voltage range during such disconnect conditions by a resistively coupled trickle charge power source. A comparator is operated to monitor capacitor charge and to produce a control signal when the voltage at the capacitor falls below a selected memory keep alive level. The control signal operates a switch to bypass the trickle charge circuit. The switch couples line power directly to the capacitor to charge the capacitor to a voltage sufficient to maintain memory contents intact. A switch inhibit circuit is provided to prevent trickle charge bypass during an inadequate or excessive line voltage condition. A sleep timer circuit is also provided to conserve energy required to operate the present invention by allowing the invention to operate periodically and only for short intervals.

• Assignee: Comdial Technology Corp.
• Patent Number(s): US 4547629
• OSTI ID: 5745990
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
CAPACITORS
COMMUNICATIONS
COMPARATOR CIRCUITS
CONTROL EQUIPMENT
DESIGN
EFFICIENCY
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ENERGY EFFICIENCY
ENERGY MANAGEMENT SYSTEMS
ENERGY SYSTEMS
EQUIPMENT
MEMORY DEVICES
OPERATION
POWER SUPPLIES
TELEPHONES
TIMING CIRCUITS