Power supply and power supplying method with power backup and power sharing
A power supply covering both power sharing and power backup functions run in a more efficient and flexible way. The power supply adopts a power sharing converter coupled between a first bus terminal and a second bus terminal, so that if one of the bus terminals provides insufficient power, the other bus terminal kicks in by way of the power sharing converter to provide power support. In addition, a storage capacitor may also kick in to provide power support if one of the bus terminals provide insufficient power via or not via the power sharing converter.
1. A power supply, comprising:
a first eFuse, configured to deliver a first input power source to a first bus terminal, to provide a first bus voltage;
a second eFuse, configured to deliver a second input power source to a second bus terminal, to provide a second bus voltage;
a power sharing converter, coupled between the first bus terminal and the second bus terminal, to provide an electrical path between the first bus terminal and the second bus terminal;
a power backup converter, coupled to either the first bus terminal or the second bus terminal; and
a controller, configured to control the first eFuse, the second eFuse, the power sharing converter and the power backup converter in response to a first sense signal indicative of the first input power source and a second sense signal indicative of the second input power source.
2. The power supply of claim 1 , wherein:
the first sense signal indicates an input current of the first input power source; and
the second sense signal indicates an input current of the second input power source.
3. The power supply of claim 2 , wherein:
if one of the input currents hits a current limit threshold, the other input power source kicks in via the power sharing converter to provide power support.
4. The power supply of claim 1 , wherein:
if one of the input power sources outage happens, the other input power source kicks in via the power sharing converter to provide power support.
5. The power supply of claim 1 , wherein:
either if both of the two input power sources outage happens, or one of the input power sources outage happens, the power backup converter is active, to supply additional power from a storage capacitor.
6. The power supply of claim 1 , wherein:
if a power supplied by the first input power source and/or the second input power source is not enough for a load, the power backup converter is active, to supply additional power to the load from a storage capacitor.
7. The power supply of claim 1 , wherein:
the first eFuse and the second eFuse each comprises a back to back switch.
8. The power supply of claim 1 , wherein:
the power sharing converter comprises a bidirectional buck-boost converter.
9. The power supply of claim 1 , wherein the controller comprises:
a first comparator, configured to compare the first sense signal with a first current limit threshold; and
a first control unit, configured to control the power sharing converter in response to the comparison result of the first comparator.
10. The power supply of claim 1 , wherein the controller comprises:
a first comparator, configured to compare the first sense signal with a first current limit threshold;
a second comparator, configured to compare the second sense signal with a second current limit threshold;
a logical AND unit, configured to execute a logical AND operation on the comparison results of the first and second comparators;
a first control unit, configured to control the power sharing converter in response to the comparison result of the first comparator; and
a second control unit, configured to control the power backup converter in response to the logical AND result of the logical AND unit.
11. A power supply, comprising:
a first eFuse, configured to deliver a first input power source to a first bus terminal, to provide a first bus voltage;
a second eFuse, configured to deliver a second input power source to a second bus terminal, to provide a second bus voltage;
a power sharing converter, coupled between the first bus terminal and the second bus terminal, to provide an electrical path between the first bus terminal and the second bus terminal;
a power backup converter, coupled to the first bus terminal; and
a controller, configured to control the first eFuse, the second eFuse, the power sharing converter and the power backup converter in response to a current sense signal indicative of a current flowing through the first eFuse and a voltage feedback signal indicative of the first bus voltage.
12. The power supply of claim 11 , wherein:
if one of the input currents hits a current limit threshold, the other input power source kicks in via the power sharing converter to provide power support.
13. The power supply of claim 11 , wherein:
If the voltage feedback signal indicates the first bus voltage drops, a storage capacitor kicks in by way of the power backup converter to provide power support.
14. The power supply of claim 11 , wherein the controller comprises:
a first comparator, configured to compare the current sense signal with a current limit threshold;
a first control unit, configured to control the power sharing converter in response to the comparison between the current sense signal and the current limit threshold;
a second comparator, configured to compare a voltage feedback signal indicative of the first bus voltage with a release threshold, to detect the voltage condition of the first bus voltage; and
a second control unit, configured to control the power backup converter in response to the comparison between the voltage feedback signal and the release threshold.
15. A power supplying method, comprising:
delivering a first input voltage to a first bus terminal to create a first electrical path;
delivering a second input voltage to a second bus terminal to create a second electrical path;
coupling a power sharing converter between the first bus terminal and the second bus terminal, the first electrical path and the second electrical path configured to provide power support between each other by way of the power sharing converter if power outage or current limit happens at one of the electrical paths; and
coupling a power backup converter either to the first bus terminal or to the second bus terminal, the first electrical path or the second electrical path being configured to charge a storage capacitor by way of the power backup converter, and either the first bus terminal or the second bus terminal being configured to derive power from the storage capacitor by way of the power backup converter.
16. The power supplying method of claim 15 , wherein:
either if a current flowing through one of the electrical paths hits a current limit threshold, or if one of the input voltages outage happens, the other input voltage kicks in via the power sharing converter to provide power support.
17. The power supplying method of claim 15 , wherein:
if both of the input voltages outage happens, the storage capacitor kicks in via the power backup converter to provide power support.
18. The power supplying method of claim 15 , wherein:
if power supplied by either one of the input voltages or both of the input voltages is not sufficient, the storage capacitor kicks in via the power backup converter to provide power support.
19. The power supplying method of claim 15 , wherein:
the first electrical path and the second electrical path are both created by an eFuse.
20. The power supplying method of claim 15 , wherein:
the power sharing converter and the power backup converter each comprises a bidirectional buck-boost converter.