Power transformation self characterization mode
A system and approach for a self-calculating test of a heating, ventilation and air conditioning load. The test may be run upon meeting predetermined conditions. Thermostatic control of the load may be disabled when the load test starts. If a call for heat or cool is made at the thermostat, response to the call may be delayed until the load test is completed, and if AC power is lost during the test, the test may finish and allow detection of the phantom AC detection device with a loss of AC power. If a voltage of a storage capacitor falls below a battery boost threshold, the test may be cancelled to allow the phantom circuit charge the storage capacitor. The system and approach may incorporate load test states that include an initialize state, start test state, get baseline state, test measure state, stabilize measurement state, calculation state, and finalize results state.
1. A method comprising:
obtaining a baseline of a reference voltage;
determining whether the baseline obtained is equal to or greater than a predetermined or needed baseline;
repeating obtaining the baseline until the baseline obtained is equal to or greater than the predetermined or needed baseline;
after determining the baseline obtained is equal to or greater than the predetermined or needed baseline, taking a measurement of a charge rate of a charge current source or a measurement of a voltage across an HVAC load;
determining whether the charge rate is equal to or greater than a predetermined charging threshold or determining the voltage across the HVAC load is equal to or greater than a predetermined voltage threshold;
determining whether the charge rate is zero, if neither the charge rate is equal to or greater than the predetermined charging threshold, nor the voltage across the HVAC load is equal to or greater than the pre-determined voltage threshold;
stabilizing the measurements, if the charge rate is equal to or greater than the predetermined charging threshold, or if the voltage across the HVAC load is equal to or greater than the predetermined voltage threshold;
returning to taking a measurement of the charge rate if the charge rate is not zero; and
testing a calculation, the calculation including calculations of one or more loads, if the charge rate is zero or upon stabilizing the measurement.
2. The method of claim 1 , wherein:
the load, selected from a group of one or more loads, has a first terminal connectable to a first terminal of a power supply;
a rectifier module has a first terminal connectable to a second terminal of the power supply;
a first switch has a first terminal connected to a second terminal of the load, and has a second terminal connected to a second terminal of the rectifier module;
a second switch has a first terminal connected to the second terminal of the load, and has a second terminal connected to the first terminal of the rectifier module;
a charge transfer block has a first terminal connected to a third terminal of the rectifier module, and has a second terminal connected to a fourth terminal of the rectifier module; and
a capacitor has a first terminal connected to a third terminal of the charge transfer block, and has a second terminal connected to the second terminal of the charge transfer block.
3. The method of claim 2 , wherein the charge transfer block comprises a voltage indicator having a first terminal connected to the first terminal of the charge transfer block, and having a second terminal connected to the second terminal of the charge transfer block.
4. The method of claim 3 , wherein the charge transfer block further comprises:
a first current source having a first terminal connected to the first terminal of the charge transfer block; and
a resistor having a first terminal connected to a second terminal of the first current source, and having a second terminal connected to the second terminal of the charge transfer block.
5. The method of claim 4 , wherein current through the first current source is controlled by a pulse width modulation signal.
6. The method of claim 1 , wherein obtaining the baseline of the reference voltage comprises:
increasing a pulse width modulation signal to the charge current source of a phantom circuit to achieve a predetermined charge rate of a storage capacitor; and
taking baseline voltage readings of the storage capacitor.
7. The method of claim 1 , wherein stabilizing the measurements comprises:
determining the charge rate of the charge current source of a phantom circuit without changing a pulse width modulation signal charge percent input to the charge current source; and
determining a voltage across the HVAC load; and
determining the impedance across the HVAC load.