Power stealing for a wireless-enabled thermostat
First Claim
1. A wireless-enabled thermostat for use in a climate control system, the thermostat comprising:
- a control having a wireless network interface configured to intermittently connect the thermostat in a wireless network in accordance with a duty cycle, the duty cycle having a connect time in which the thermostat is connected in the wireless network and a sleep time in which the thermostat is not connected in the wireless network; and
a power stealing circuit configured to steal power through an “
on-mode”
load of the climate control system and to charge a capacitor to provide the power for the wireless network interface, the power stealing circuit having a current transformer in series with a relay operable to switch the load between “
on” and
“
off”
modes, the current transformer configured to obtain current from the “
on-mode”
load for charging the capacitor;
the control configured to adjust at least the sleep time in accordance with a time for charging the capacitor to a threshold voltage.
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0 Petitions
Accused Products
Abstract
Disclosed are exemplary embodiments of apparatus, systems and methods for power stealing for a wireless-enabled thermostat. In an exemplary embodiment, a wireless-enabled thermostat generally includes a control having a wireless network interface that intermittently connects the thermostat in a wireless network in accordance with a duty cycle, the duty cycle having a connect time in which the thermostat is connected in the wireless network and a sleep time in which the thermostat is not connected in the wireless network. A power stealing circuit of the thermostat steals power through an “on-mode” load of a climate control system to charge a capacitor or other energy storage device to provide the power for the wireless network interface. The control adjusts at least the sleep time in accordance with a time for charging the capacitor or other energy storage device to a threshold voltage.
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Citations
20 Claims
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1. A wireless-enabled thermostat for use in a climate control system, the thermostat comprising:
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a control having a wireless network interface configured to intermittently connect the thermostat in a wireless network in accordance with a duty cycle, the duty cycle having a connect time in which the thermostat is connected in the wireless network and a sleep time in which the thermostat is not connected in the wireless network; and a power stealing circuit configured to steal power through an “
on-mode”
load of the climate control system and to charge a capacitor to provide the power for the wireless network interface, the power stealing circuit having a current transformer in series with a relay operable to switch the load between “
on” and
“
off”
modes, the current transformer configured to obtain current from the “
on-mode”
load for charging the capacitor;the control configured to adjust at least the sleep time in accordance with a time for charging the capacitor to a threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless-enabled thermostat for use in a climate control system, the thermostat comprising:
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a control having a wireless network interface configured to intermittently connect the thermostat in a wireless network in accordance with a duty cycle, the duty cycle having a connect time in which the thermostat is connected in the wireless network and a sleep time in which the thermostat is not connected in the wireless network; and a power stealing circuit configured to steal power through at least an “
on-mode”
load of the climate control system and to charge an energy storage device over a time period varying with current through the “
on-mode”
load, to provide the power for the wireless network interface, the power stealing circuit having a current transformer in series with a relay operable to switch the load between “
on” and
“
off”
modes, the current transformer configured to obtain current from the “
on-mode”
load for charging the energy storage device;the control configured to adjust at least the sleep time in accordance with the varying time period. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of communicating in a wireless network, the method performed by a wireless thermostat of a climate control system, the method comprising:
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controlling a wireless network interface of the thermostat to intermittently connect the thermostat in a wireless network in accordance with a duty cycle, the duty cycle having a connect time in which the thermostat is connected in the wireless network and a sleep time in which the thermostat is not connected in the wireless network; stealing power through at least an “
on-mode”
load of the climate control system, the stealing performed at least in part by receiving current from the “
on-mode”
load from a current transformer in series with a relay operable to switch the load between “
on” and
“
off”
modes and using the received current for charging an energy storage device to provide the power for the wireless network interface, where the current being received from the current transformer for the charging increases as current increases through the “
on-mode”
load; andadjusting at least the sleep time in accordance with a time for charging the energy storage device to a threshold voltage. - View Dependent Claims (19, 20)
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Specification