Power management in single circuit HVAC systems and in multiple circuit HVAC systems
First Claim
1. A thermostat for use in connection with a HVAC (heating, ventilation, and air conditioning) system, the HVAC system having a single circuit system, a multiple circuit system, or a common wire system, the thermostat comprising:
- insertion sensing circuitry operative to provide insertion sensing signals indicative of a wiring scheme associated with the HVAC system being connected to the thermostat; and
control circuitry operative to;
receive the insertion sensing signals;
determine the wiring scheme based on the received insertion sensing signals; and
engage in single circuit power stealing, multi-circuit power stealing, or common wire power utilization for obtaining power from the HVAC system based on the determined wiring scheme, wherein;
the single circuit power stealing is characterized by using both active and inactive power stealing from a single HVAC control wire;
the multi-circuit power stealing is characterized by only using inactive power stealing on a non-enabled circuit within the multiple circuit system;
orthe common wire system is characterized by using neither active power stealing nor inactive power stealing,wherein active power stealing is characterized by momentarily opening a closed contact during an enabled phase of the single circuit system.
1 Assignment
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Accused Products
Abstract
A thermostat includes a plurality of HVAC (heating, ventilation, and air conditioning) wire connectors for receiving a plurality of HVAC control wires corresponding to an HVAC system. The thermostat also includes a thermostat processing and control circuit operative to at least partially control the operation of the HVAC system and a powering circuit coupled to the HVAC wire connectors and configured to provide an electrical load power to the thermostat processing and control circuit. The thermostat includes circuitry and methods for maximizing efficiency of energy harvested from the HVAC system connected to the thermostat, and depending on which system is connected to the thermostat, different power schemes can be implemented in order to obtain power from the HVAC system.
504 Citations
25 Claims
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1. A thermostat for use in connection with a HVAC (heating, ventilation, and air conditioning) system, the HVAC system having a single circuit system, a multiple circuit system, or a common wire system, the thermostat comprising:
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insertion sensing circuitry operative to provide insertion sensing signals indicative of a wiring scheme associated with the HVAC system being connected to the thermostat; and control circuitry operative to; receive the insertion sensing signals; determine the wiring scheme based on the received insertion sensing signals; and engage in single circuit power stealing, multi-circuit power stealing, or common wire power utilization for obtaining power from the HVAC system based on the determined wiring scheme, wherein; the single circuit power stealing is characterized by using both active and inactive power stealing from a single HVAC control wire; the multi-circuit power stealing is characterized by only using inactive power stealing on a non-enabled circuit within the multiple circuit system;
orthe common wire system is characterized by using neither active power stealing nor inactive power stealing, wherein active power stealing is characterized by momentarily opening a closed contact during an enabled phase of the single circuit system. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A thermostat for use in connection with a HVAC (heating, ventilation, and air conditioning) system, the HVAC system having a single circuit system, a multiple circuit system, or a common wire system, the thermostat comprising:
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insertion sensing circuitry operative to provide insertion sensing signals indicative of a wiring scheme associated with the HVAC system being connected to the thermostat; and control circuitry operative to; receive the insertion sensing signals; determine the wiring scheme based on the received insertion sensing signals; and engage in single circuit power stealing, multi-circuit power stealing, or common wire power utilization for obtaining power from the HVAC system based on the determined wiring scheme, wherein; the single circuit power stealing is characterized by using both active and inactive power stealing from a single HVAC control wire; the multi-circuit power stealing is characterized by only using inactive power stealing on a non-enabled circuit within the multiple circuit system;
orthe common wire system is characterized by using neither active power stealing nor inactive power stealing, wherein active power stealing is characterized by receiving power from an enabled HVAC relay circuit in a manner that does not untrip the enabled HVAC relay circuit. - View Dependent Claims (9, 10, 11)
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12. A thermostat for use in connection with a HVAC (heating, ventilation, and air conditioning) system, the HVAC system having a single circuit system, a multiple circuit system, or a common wire system, the thermostat comprising:
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insertion sensing circuitry operative to provide insertion sensing signals indicative of a wiring scheme associated with the HVAC system being connected to the thermostat; and control circuitry operative to; receive the insertion sensing signals; determine the wiring scheme based on the received insertion sensing signals; and engage in single circuit power stealing, multi-circuit power stealing, or common wire power utilization for obtaining power from the HVAC system based on the determined wiring scheme, wherein; the single circuit power stealing is characterized by using both active and inactive power stealing from a single HVAC control wire; the multi-circuit power stealing is characterized by only using inactive power stealing on a non-enabled circuit within the multiple circuit system;
orthe common wire system is characterized by using neither active power stealing nor inactive power stealing, wherein inactive power stealing is characterized by receiving power from a non-enabled HVAC relay circuit in a manner that does not trip the non-enabled HVAC relay circuit. - View Dependent Claims (13, 14, 15)
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16. A thermostat for use in connection with a HVAC (heating, ventilation, and air conditioning) system, the HVAC system having a single circuit system, a multiple circuit system, or a common wire system, the thermostat comprising:
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insertion sensing circuitry operative to provide insertion sensing signals indicative of a wiring scheme associated with the HVAC system being connected to the thermostat; and control circuitry operative to; receive the insertion sensing signals; determine the wiring scheme based on the received insertion sensing signals; and engage in single circuit power stealing, multi-circuit power stealing, or common wire power utilization for obtaining power from the HVAC system based on the determined wiring scheme, wherein; the single circuit power stealing is characterized by using both active and inactive power stealing from a single HVAC control wire, wherein active power stealing is characterized in harvesting power from the HVAC system by fast switching a transistor; the multi-circuit power stealing is characterized by only using inactive power stealing on a non-enabled circuit within the multiple circuit system, wherein inactive power stealing is characterized in harvesting power from the HVAC system by not fast switching the transistor;
orthe common wire system is characterized by using neither active power stealing nor inactive power stealing. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A thermostat for use in connection with a HVAC (heating, ventilation, and air conditioning) system, the HVAC system having a single circuit system, a multiple circuit system, or a common wire system, the thermostat comprising:
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insertion sensing circuitry operative to provide insertion sensing signals indicative of a wiring scheme associated with the HVAC system being connected to the thermostat; and control circuitry operative to; receive the insertion sensing signals; determine the wiring scheme based on the received insertion sensing signals; and engage in single circuit power stealing, multi-circuit power stealing, or common wire power utilization for obtaining power from the HVAC system based on the determined wiring scheme, wherein; the single circuit power stealing is characterized by using both active and inactive power stealing from a single HVAC control wire, wherein active power stealing is characterized in harvesting power from the HVAC system by duty cycling a field effect transistor; the multi-circuit power stealing scheme is characterized by only using inactive power stealing on a non-enabled circuit within the multiple circuit system, wherein inactive power stealing is characterized in harvesting power from the HVAC system by not duty cycling switching the field effect transistor;
orthe common wire system is characterized by using neither active power stealing nor inactive power stealing. - View Dependent Claims (23, 24, 25)
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Specification