Overvoltage recovery circuit and a controller and HVAC system including the same
AssigneeLennox Industries Inc.
InventorJimmie Curry
Life of this patent
Estimating the term…
Abstract
An overvoltage recovery circuit (ORC), a controller for an HVAC system and an HVAC system are disclosed herein. In one embodiment, the ORC includes: (1) a first supply voltage terminal connected to a first voltage supply, (2) a second supply voltage terminal connected to a second voltage supply, (3) interruption circuitry including a switch and a trip terminal connected to the second supply voltage terminal and (4) detection circuitry connected to the first supply voltage terminal and the switch of the interruption circuitry, the detection circuitry configured to operate the switch in response to an overvoltage condition at the first supply voltage terminal.
Claims20
A heating, ventilating and air conditioning (HVAC) system, comprising:
- a heating source or a cooling source;
- and
- an HVAC controller configured to direct operation of said heating source or said cooling source, said HVAC controller including:
- a processor configured to provide control signals for components of said HVAC system;
- a hardware watchdog configured to receive an interrupt signal from said processor and interrupt power to said processor in response thereof;
- and
- an overvoltage recovery circuit (ORC) including:
- a first supply voltage terminal connected to a first voltage supply;
- a second supply voltage terminal connected to a second voltage supply;
- interruption circuitry including a switch and a trip terminal connected to said second supply voltage terminal;
- and
- detection circuitry connected to said first supply voltage terminal and said switch of said interruption circuitry, said detection circuitry configured to operate said switch in response to an overvoltage condition at said first supply voltage terminal.
A heating, ventilating and air conditioning (HVAC) system, comprising:
- a heating source or a cooling source;
- and
- an HVAC controller configured to direct operation of said heating source or said cooling source, said HVAC controller including:
- a processor configured to provide control signals for components of said HVAC system;
- a hardware watchdog configured to receive an interrupt signal from said processor and interrupt power to said processor in response thereof;
- and
- an overvoltage recovery circuit (ORC) including:
- a first supply voltage terminal connected to a first voltage supply;
- a second supply voltage terminal connected to a second voltage supply;
- interruption circuitry comprising a switch and a trip terminal;
- detection circuitry connected to the first supply voltage terminal and the switch of the interruption circuitry, the detection circuitry configured to operate the switch in response to an overvoltage condition at the first supply voltage terminal;
- and
- wherein the detection circuitry comprises an overvoltage protection device connected in series with a unidirectional transient-voltage-suppression diode and in parallel with an undervoltage protection device.
A controller for a heating, ventilating and air conditioning (HVAC) system, the controller comprising:
- a power supply;
- a hardware watchdog coupled to the power supply;
- an overvoltage recovery circuit (ORC) connected to the power supply;
- and
- a user interface coupled to the ORC and the power supply, the ORC comprising:
- a first supply voltage terminal connected to a first voltage supply;
- a second supply voltage terminal connected to a second voltage supply;
- interruption circuitry including a switch and a trip terminal;
- detection circuitry connected to the first supply voltage terminal and the switch of the interruption circuitry, the detection circuitry configured to operate the switch in response to an overvoltage condition at the first supply voltage terminal;
- wherein the interruption circuitry is configured to provide a trip signal at the trip terminal in response to operation of the switch.
Dependencies are inferred from the claim text.