Systems and methods for enhanced efficiency auxiliary power supply module
A power supply for use in a solar electric production system, including: a first stage having an input connected to a voltage from a photovoltaic panel and an output providing a first voltage different from the voltage from the photovoltaic panel; and a second stage connected to the output of the first stage, the second stage supplying power at a second voltage to a micro-controller, where the output of the first stage is turned on and stable for a period of time before the second stage is turned on to supply the power at the second voltage to the micro-controller.
1. An apparatus, comprising:
a micro-controller;
a first stage power converter to generate a first output from a direct current input;
a switchable load powered by the first output;
a control circuit powered by the first output; and
a second stage power converter connected to the first stage power converter and configured to convert the first output to a second output;
wherein the control circuit is configured to block the second stage power converter from powering the micro-controller using the second output in a time period that is after the control circuit is powered by the first output and before a predefined condition is met in the control circuit; and
wherein the control circuit is configured to signal the switchable load to be in a first state of consuming the first output during the time period and to be in a second state of not consuming the first output after the time period.
2. The apparatus of claim 1 ,
wherein the predefined condition includes a voltage of the first output reaching a threshold.
3. The apparatus of claim 1 , wherein, when the switchable load is in the second state, the voltage above the threshold is sufficient to power the second stage power converter to operate the micro-controller for at least a predetermined period of time during which the direct current input to the first stage power converter has diminishing power.
4. The apparatus of claim 1 , wherein the switchable load comprises:
a resistive device; and
a switching device connected to the resistive device, wherein the switching device is turned on in the first state to connect the resistive device to the first output and turned off in the second state to disconnect the resistive device from the first output.
5. The apparatus of claim 1 , wherein the control circuit delays a first signal instructing the switching device to change from the first state to the second state to generate a second delayed signal that instructs the second stage power converter to change from not powering the micro-controller to powering the micro-controller.
6. The apparatus of claim 5 , wherein the control circuit comprises:
a hysteresis amplifier coupled to the first output to generate the first signal; and
a delay circuit coupled to the first signal to generate the second delayed signal.
7. A method to supply power, the method comprising:
generating, by a first stage power converter, a first output from a direct current input;
powering a control circuit using the first output;
generating, by a second stage power converter connected to the first stage power converter, a second output from the first output from the first stage power converter;
blocking, by the control circuit during a time period that is after the control circuit is powered by the first output and before a predefined condition is met in the control circuit, the second output from the second stage power converter from powering a micro-controller;
consuming, by a switchable load in a power absorption circuit, a portion of the first output from the first stage power converter during the time period;
powering the micro-controller using the second output from the second stage power converter after the time period; and
stopping, by the control circuit and after the time period, the switchable load from consuming the first output from the first stage power converter.
8. The method of claim 7 , wherein the predefined condition includes a voltage of the first output reaching a threshold.
9. The method of claim 7 , further comprising:
signaling, by the control circuit, the switchable load to be in a first state of consuming the portion of the first output during the time period; and
signaling, by the control circuit, the switchable load to be in a second state of not consuming the first output from the first stage power converter after the time period.
10. The method of claim 9 , wherein, when the switchable load is in the second state, the voltage above the threshold is sufficient to power the second stage power converter to operate the micro-controller for at least a predetermined period of time during which the direct current input to the first stage power converter has diminishing power.
11. The method of claim 9 , wherein the switchable load includes a resistive device, and a switching device connected to the resistive device; wherein the method further includes:
turning on the switching device to place the switchable load in the first state in which the resistive device is connected to the first output; and
turned off the switching device to place the switchable load in the second state in which the resistive device is disconnected from the first output.
12. The method of claim 9 , further comprising:
delaying, by the control circuit, a first signal instructing the switching device to change from the first state to the second state; and
generating, via the delaying, a second delayed signal that instructs the second stage power converter to change from not powering the micro-controller to powering the micro-controller.
13. The method of claim 12 , further comprising:
generating the first signal using a hysteresis amplifier coupled to the first output.