Thermostat operable from various power sources
First Claim
1. A thermostat comprising:
- a heating transformer power terminal;
a heating load terminal;
a common terminal; and
a power source selector configurable to operate the thermostat from alternating-current voltage provided between the common terminal and the heating load terminal when the power source selector is in a first position, and to operate the thermostat from alternating-current voltage provided between the heating transformer power terminal and the heating load terminal when the power source selector is in a second position.
1 Assignment
0 Petitions
Accused Products
Abstract
A thermostat is operable from battery, common-wire (“C-wire”), or furnace relay power. The thermostat includes a power source selector, such as a jumper wire, that is set when the thermostat is installed in a heating system. In a gas millivolt heating system, the thermostat operates off of battery power. In heating systems having a C-wire, a diode bridge converter converts alternating-current voltage to direct-current voltage to provide operating power to the thermostat. In heating systems without a C-wire and having sufficient furnace relay current, a triac converter in series with the furnace relay provides voltage spikes to the diode bridge converter to provide operating power to the thermostat when the furnace is on, and the diode bridge converts AC to DC voltage when the furnace is not on. The thermostat can also be used in cooling systems and heating, ventilation, and air-conditioning systems. Thus, the thermostat can be used in a wide variety of applications.
-
Citations
15 Claims
-
1. A thermostat comprising:
-
a heating transformer power terminal;
a heating load terminal;
a common terminal; and
a power source selector configurable to operate the thermostat from alternating-current voltage provided between the common terminal and the heating load terminal when the power source selector is in a first position, and to operate the thermostat from alternating-current voltage provided between the heating transformer power terminal and the heating load terminal when the power source selector is in a second position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A thermostat comprising:
-
a heating transformer power terminal;
a heating load terminal;
a common terminal;
a diode bridge converter;
a triac converter; and
a power source selector configurable to operate the thermostat from alternating-current voltage provided between the common terminal and the heating load terminal when the power source selector is in a first position, and to operate the thermostat from alternating-current voltage provided between the heating transformer power terminal and the heating load terminal when the power source selector is in a second position, the triac converter providing voltage spikes to the diode bridge converter when the heating transformer power terminal is coupled to the heating load terminal through the triac converter when the power source selector is in the second position, and the diode bridge converter converting alternating-current voltage between the heating transformer power terminal and the heating load terminal when the power source selector is in the second position and the heating load terminal is not coupled to the heating load terminal through the triac converter, the heating transformer power terminal being coupled to the heating load terminal bypassing the triac converter when the power source selector is in the first position. - View Dependent Claims (11, 12)
-
-
13. A thermostat comprising:
-
a heating transformer power terminal;
a heating load terminal;
a common terminal;
a thermostat controller;
a power supply providing a regulated direct-current voltage to the thermostat controller;
a battery providing a battery voltage to the thermostat controller, the battery voltage being less than the regulated direct-current voltage;
a power source selector having a first position and a second position;
a diode bridge converter providing direct-current voltage to the power supply, wherein the diode bridge converter converts alternating-current voltage provided between the heating load terminal and the common terminal when the power source selector is in the first position, and converts alternating-current voltage provided between the heating load terminal and the heating transformer power terminal when the power source selector is in the second position. - View Dependent Claims (14, 15)
-
Specification