Power stealing circuitry for a control device
First Claim
Patent Images
1. An HVAC control device for controlling an HVAC component, the HVAC control device comprising:
- a controller;
a charge storage device for storing a charge, wherein the charge storage device powers the controller at times;
an input for receiving an AC signal from an AC power source;
a switch having an “
on”
state and an “
off”
state, wherein the switch is configured to switch power from the AC power source “
on” and
“
off”
to the HVAC component; and
the controller is configured to control the switch so as to activate and deactivate the HVAC component, the controller is further configured to control the switch when the HVAC component is activated for power stealing, wherein for power stealing, the controller is configured to set the switch to an “
on”
state when the AC signal is above a first threshold, and to temporarily set the switch to an “
off”
state when the AC signal is below a second threshold, wherein power from the AC signal is made available for charging the charge storage device when the switch is in the “
off”
state and is not made available for charging the charge storage device when the switch is in the “
on”
state.
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Abstract
A power stealing circuit for stealing power to operate a control device is disclosed. In one illustrative embodiment, power may be periodically or intermittently diverted from a power source to a power stealing block. When power is diverted to the power stealing block, the power stealing block may steal power from the power source and store the stolen power on a storage device. The storage device may then provide operating power to a control device. In some embodiments, the power stealing block may include a first path for charging the storage device when a switch is ON, and a second path for charging the storage device when the switch is off. The switch may be switched OFF when, for example, when the voltage provided by the rectifier is greater than a threshold voltage, the voltage detected on the storage device is greater than a threshold value, and/or when a control signal from a controller disables the switch.
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Citations
20 Claims
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1. An HVAC control device for controlling an HVAC component, the HVAC control device comprising:
-
a controller; a charge storage device for storing a charge, wherein the charge storage device powers the controller at times; an input for receiving an AC signal from an AC power source; a switch having an “
on”
state and an “
off”
state, wherein the switch is configured to switch power from the AC power source “
on” and
“
off”
to the HVAC component; andthe controller is configured to control the switch so as to activate and deactivate the HVAC component, the controller is further configured to control the switch when the HVAC component is activated for power stealing, wherein for power stealing, the controller is configured to set the switch to an “
on”
state when the AC signal is above a first threshold, and to temporarily set the switch to an “
off”
state when the AC signal is below a second threshold, wherein power from the AC signal is made available for charging the charge storage device when the switch is in the “
off”
state and is not made available for charging the charge storage device when the switch is in the “
on”
state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An HVAC control device for controlling an HVAC component, the HVAC control device comprising:
-
a controller; a charge storage device for storing a charge, wherein the charge storage device powers the controller at times; an input for receiving an AC signal from an AC power source; a rectifier for rectifying the AC signal, resulting in a rectified AC signal; a switch having an “
on”
state and an “
off”
state, wherein the switch is configured to switch power from the AC power source “
on” and
“
off”
to the HVAC component that is to be controlled by the HVAC control device; andthe controller is configured to control the switch so as to activate and deactivate the HVAC component, the controller is further configured to control the switch when the HVAC component is activated for power stealing, wherein for power stealing, the controller is configured to set the switch to an “
on”
state when the AC signal is above a first threshold voltage, and to temporarily set the switch to an “
off”
state when the AC signal is below a second threshold voltage, wherein when the switch to an “
off”
state power from the rectified AC signal is made available for charging the charge storage device. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for power stealing in an HVAC controller, wherein the HVAC controller is configured to control an HVAC component, the method comprising:
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receiving an AC signal from an AC power source; directing the AC signal to an output terminal of the HVAC controller to activate an HVAC component that is coupled to the output terminal, and not directing the AC signal at the output terminal of the HVAC controller to deactivate the HVAC component; while keeping the HVAC component activated, temporarily not directing the AC signal at the output terminal of the HVAC controller during each of a plurality of power stealing intervals, wherein each of the plurality of power stealing intervals correspond to a different AC cycle of the AC signal and where the amplitude of the AC signal is below a threshold voltage; stealing power from the AC signal to charge a charge storage device during at least some of the plurality of power stealing intervals; and powering at least part of the HVAC controller using the charge storage device at times.
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Specification
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Current AssigneeAdemco Inc. (Resideo Technologies, Inc.)
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Original AssigneeHoneywell International Inc.
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InventorsSimard, Pierre, Meilleur, Benoit, Tousignant, Daniel
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Primary Examiner(s)Fureman, Jared
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Assistant Examiner(s)Pham, Duc M
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Application NumberUS14/740,927Publication NumberTime in Patent Office665 DaysField of Search307102US Class CurrentCPC Class CodesH02J 9/06 with automatic change-over ...H02M 1/0006 Arrangements for supplying ...H02M 5/2573 with control circuitH02M 7/04 by static convertersH02M 7/2176 comprising a passive stage ...
