Back to results
US 5,852,377 AGranted
Reset circuit for ensuring proper reset when used with decaying power supplies
AssigneeThomson Consumer Electronics, Inc.
InventorRobert Alan Pitsch
Life of this patent
Estimating the term…
Abstract
An eletronic system includes a power supply providing an operating voltage, and a reset circuit. The reset circuit includes a voltage sensing circuit, coupled to the power supply, for generating a control signal when the operating voltage drops below a predetermined voltage. A control circuit generates a rest signal in response to the control signal. Further circuitry provides power to the control circuit, independently of the power supply, when the operating voltage drops below the predetermined voltage.
Claims18
A reset circuit, comprising:
- a power supply for providing a main power supply voltage and for providing an operating voltage;
- voltage sensing circuitry, coupled to the power supply, for generating a control signal in response to the main power supply voltage dropping below a predetermined voltage;
- a control circuit for generating a reset signal in response to the control signal;
- and
- circuitry for providing power to the control circuit in response to the operating voltage dropping below a further predetermined voltage.
2 more elements
In a system including:
- electronic equipment;
- a main power supply providing a main voltage;
- and a source of an operational voltage derived from the main power supply for the electronic equipment, the operational voltage remaining relatively constant while the main voltage remains above a predetermined minimum voltage;
- a reset circuit comprising:
- voltage sensing circuitry for generating a control signal in response to the main voltage dropping below a predetermined trigger voltage which is above the predetermined minimum voltage;
- a control circuit, for generating a reset signal in response to the control signal;
- and
- circuitry, coupled to the operational voltage source, for providing power to the control circuit independently of the main power supply in response to the operational voltage dropping below the predetermined minimum voltage;
- the control circuit being responsive to the power from the power providing circuitry for continuing to generate the reset signal until the operational voltage drops to substantially zero volts during a power interruption.
6 more elements
Dependencies are inferred from the claim text.