Systems, methods, apparatuses, and integrated circuits for power conversion with improved regulator control
The present disclosure relates to power conversion, and more particularly, to systems, methods, apparatuses, and integrated circuits for power conversion with improved regulator control. In one embodiment, a power converter system is disclosed, comprising: a power conversion circuit; a linear regulator; a first switching device electrically coupled between an output of the power conversion circuit and an output of the linear regulator; and a control circuitry electrically coupled to the first switching device. In this power conversion circuit, after a voltage at the output of the power conversion circuit exceeds a reference voltage, the control circuitry is configured to discharge an output capacitance of the linear regulator until a voltage at the output of the linear regulator is substantially the same as the voltage at the output of the power conversion circuit.
1. A power converter system, comprising:
a power conversion circuit;
a linear regulator;
a first switching device electrically coupled between an output of the power conversion circuit and an output of the linear regulator;
a control circuitry electrically coupled to the first switching device; and
a second switching device electrically coupled across an output capacitance of the linear regulator;
wherein:
the control circuitry is electrically coupled to the second switching device;
after a voltage at the output of the power conversion circuit exceeds a reference voltage, the control circuitry is configured to discharge the output capacitance of the linear regulator until a voltage at the output of the linear regulator is substantially the same as the voltage at the output of the power conversion circuit; and
the control circuitry is configured to close the second switching device at a time when a voltage at the output of the linear regulator exceeds the voltage at the output of the power conversion circuit.
2. The system of claim 1 , wherein the control circuitry is configured to close the first switching device after a voltage at the output of the linear regulator matches the voltage at the output of the power conversion circuit.
3. The system of claim 1 , the control circuitry further comprising a latch that is configured to open the first switching device and close the second switching device if the voltage at the output of the power conversion circuit exceeds the reference voltage, and the voltage at the output of the linear regulator exceeds the voltage at the output of the power conversion circuit.
4. The system of claim 3 , wherein the latch is further configured to hold existing positions for the first switching device and the second switching device while the voltage at the output of the power conversion circuit exceeds the reference voltage, and the voltage at the output of the linear regulator exceeds the voltage at the output of the power conversion circuit.
5. The system of claim 3 , wherein the latch is further configured to close the first switching device after the voltage at the output of the power conversion circuit exceeds the voltage at the output of the linear regulator.
6. The system of claim 1 , where the power conversion circuit is a step-down converter.
7. The system of claim 6 , wherein the step-down converter is a charge pump.
8. The system of claim 1 , wherein the linear regulator is a low drop-out regulator.
9. The system of claim 8 , wherein the control circuitry is configured to turn on or off the low drop-out regulator.
10. The system of claim 1 , wherein the control circuitry is configured to reduce a voltage at the output of the linear regulator in a substantially linear manner after the control circuitry closes the second switching device.
11. The system of claim 1 , wherein the voltage at the output of the linear regulator is substantially the same as the voltage at the output of the power conversion circuit when the voltage at the output of the linear regulator is within 10% of the voltage at the output of the power conversion circuit.
12. The system of claim 11 , wherein the voltage at the output of the linear regulator is substantially the same as the voltage at the output of the power conversion circuit when the voltage at the output of the linear regulator is within 5% of the voltage at the output of the power conversion circuit.
13. The system of claim 12 , wherein the voltage at the output of the linear regulator is substantially the same as the voltage at the output of the power conversion circuit when the voltage at the output of the linear regulator is within 1% of the voltage at the output of the power conversion circuit.
14. A power conversion method, comprising:
comparing, via a control circuitry, a voltage at an output of a power conversion circuit to a reference voltage;
wherein a first switching device is electrically coupled between the output of the power conversion circuit and an output of a linear regulator;
wherein the control circuitry is electrically coupled to the first switching device;
discharging an output capacitance of the linear regulator after the voltage at the output of the power conversion circuit exceeds the reference voltage, until a voltage at the output of the linear regulator is substantially the same as the voltage at the output of the power conversion circuit;
wherein a second switching device is electrically coupled across the output capacitance of the linear regulator, the control circuitry electrically coupled to the second switching device; and
closing, via the control circuitry, the second switching device;
wherein, when the second switching device is closed via the control circuitry, a voltage at the output of the linear regulator exceeds the voltage at the output of the power conversion circuit.
15. The method of claim 14 , further comprising:
closing, via the control circuitry, the first switching device after a voltage at the output of the linear regulator matches the voltage at the output of the power conversion circuit.
16. The method of claim 14 , further comprising:
providing, via a latch included in the control circuitry, a signal to open the first switching device and close the second switching device if the voltage at the output of the power conversion circuit exceeds the reference voltage, and the voltage at the output of the linear regulator exceeds the voltage at the output of the power conversion circuit.
17. The method of claim 16 , further comprising:
holding, via the latch included in the control circuitry, existing positions for the first switching device and the second switching device while the voltage at the output of the power conversion circuit exceeds the reference voltage, and the voltage at the output of the linear regulator exceeds the voltage at the output of the power conversion circuit.
18. The method of claim 16 , further comprising:
closing, via the latch included in the control circuitry, the first switching device after the voltage at the output of the power conversion circuit exceeds the voltage at the output of the linear regulator.
19. The method of claim 14 , wherein the power conversion circuit is a step-down converter.
20. The method of claim 19 , wherein the step-down converter is a charge pump.
21. The method of claim 14 , wherein the linear regulator is a low drop-out regulator.
22. The method of claim 21 , wherein the control circuitry is configured to turn on or off the low drop-out regulator.
23. The method of claim 14 , further comprising:
reducing, via the control circuitry, a voltage at the output of the linear regulator in a substantially linear manner after the control circuitry closes the second switching device.
24. The method of claim 14 , wherein the voltage at the output of the linear regulator is substantially the same as the voltage at the output of the power conversion circuit when the voltage at the output of the linear regulator is within 10% of the voltage at the output of the power conversion circuit.
25. The method of claim 24 , wherein the voltage at the output of the linear regulator is substantially the same as the voltage at the output of the power conversion circuit when the voltage at the output of the linear regulator is within 5% of the voltage at the output of the power conversion circuit.
26. The method of claim 25 , wherein the voltage at the output of the linear regulator is substantially the same as the voltage at the output of the power conversion circuit when the voltage at the output of the linear regulator is within 1% of the voltage at the output of the power conversion circuit.