Power supply and load allocation method thereof

Patent metadata

Field	Value
Publication number	US-2025112460-A1
Application number	US-202418891654-A
Country	US
Kind code	A1
Filing date	Sep 20, 2024
Priority date	Sep 28, 2023
Publication date	Apr 3, 2025
Grant date	—

Abstract

A power supply includes a conversion circuit, an auxiliary power circuit, and an output control circuit. The conversion circuit converts a DC power into a first output power, and the auxiliary power circuit converts the DC power into a first auxiliary power. The output control circuit is used to selectively connect a first output terminal and a second output terminal so that when the output control circuit disconnects the first output terminal and the second output terminal, the first output power supplies power to a critical load through the first output terminal, and when the output control circuit connects the first output terminal and the second output terminal, the first output power supplies power to the critical load and a non-critical load through the first output terminal and the second output terminal respectively.

First claim

What is claimed is:

1 . A power supply, comprising:
a conversion circuit, configured to convert a DC power into a first output power, and the conversion circuit coupled to a critical load through a first output terminal so as to provide the first output power to the critical load through the first output terminal, an auxiliary power circuit, configured to convert the DC power into a first auxiliary power, and an output control circuit, coupled to the first output terminal and a second output terminal, and the second output terminal coupled to a non-critical load, wherein the output control circuit is configured to electrically connect the first output terminal and the second output terminal in a selective manner so that when the output control circuit disconnects the first output terminal and the second output terminal, the first output power is configured to supply power to the critical load through the first output terminal, and when the output control circuit connects the first output terminal and the second output terminal, the first output power is configured to supply power to the critical load and the non-critical load through the first output terminal and the second output terminal respectively.

2 . The power supply as claimed in claim 1 , wherein when the conversion circuit normally operates and the first output power still has a margin, the output control circuit connects the first output terminal and the second output terminal so that the conversion circuit provides a second auxiliary power to the second output terminal through the output control circuit; when the conversion circuit normally operates and the first output power has no margin, the output control circuit connects the second output terminal and the auxiliary power circuit so that the auxiliary power circuit provides the first auxiliary power to the second output terminal through the output control circuit.

3 . The power supply as claimed in claim 1 , wherein when the first output power is not within a predetermined range, the output control circuit connects the first output terminal and the second output terminal so that the auxiliary power circuit provides a second output power to the first output terminal through the output control circuit to extend a hold-up time of the conversion circuit.

4 . The power supply as claimed in claim 1 , wherein when the first output power fails to respond to a power demand of the critical load, the output control circuit connects the first output terminal and the second output terminal so that the auxiliary power circuit provides a second output power to the first output terminal through the output control circuit.

5 . The power supply as claimed in claim 1 , wherein the output control circuit comprises:
a DC conversion circuit, coupled to the first output terminal, and configured to convert the first output power into a second auxiliary power, and a switch circuit, coupled to the DC conversion circuit, the auxiliary power circuit, and the second output terminal, wherein when the conversion circuit normally operates and the first output power still has a margin, the switch circuit connects the DC conversion circuit and the second output terminal, and the DC conversion circuit converts the first output power into the second auxiliary power; when the conversion circuit normally operates and the first output power has no margin, the switch circuit connects the second output terminal and the auxiliary power circuit so that the auxiliary power circuit provides the first auxiliary power to the second output terminal through the output control circuit.

6 . The power supply as claimed in claim 5 , wherein the output control circuit further comprises:
a bypass switch, connected to the DC conversion circuit in parallel, wherein when an output voltage provided from the conversion circuit does not match an auxiliary voltage provided from the auxiliary power circuit, the bypass switch is turned off, and the DC conversion circuit converts the first output power into the second auxiliary power; when the output voltage is equal to the auxiliary voltage, the bypass switch is turned on, and the first output power is used as the second auxiliary power and is provided to the second output terminal through the bypass switch.

7 . The power supply as claimed in claim 6 , wherein the DC conversion circuit is a bidirectional DC converter, and when the auxiliary voltage is greater than or less than the output voltage, the bypass switch is turned off, and the DC conversion circuit converts the first auxiliary power into a second output power; when the auxiliary voltage is equal to the output voltage, the bypass switch is turned on, and the first auxiliary power is used as the second output power and is provided to the first output terminal through the bypass switch.

8 . The power supply as claimed in claim 5 , wherein the DC conversion circuit is a bidirectional DC converter, and when the first output power is not within a predetermined range or the first output power fails to respond to a power demand of the critical load, the switch circuit connects the DC conversion circuit and the second output terminal, and the DC conversion circuit converts the first auxiliary power into a second output power to provide the second output power to the first output terminal.

9 . The power supply as claimed in claim 5 , wherein the switch circuit comprises:
a switch, one terminal of the switch coupled to the first output terminal, and the other terminal of the switch coupled to the second output terminal, and a unidirectional conduction component, one terminal of the unidirectional conduction component coupled to the auxiliary power circuit, and the other terminal of the unidirectional conduction component coupled to the second output terminal, wherein a forward bias direction of the unidirectional conduction component is from the auxiliary power circuit to the second output terminal.

10 . The power supply as claimed in claim 9 , wherein the switch is integrated into the DC conversion circuit, and is used as an output protection switch of the DC conversion circuit.

11 . The power supply as claimed in claim 10 , wherein the switch circuit further comprises:
a control circuit, coupled to a control terminal of the switch and an output terminal of the conversion circuit, wherein when the control circuit determines that an output voltage of the conversion circuit is greater than an undervoltage lockout value, the control circuit turns on the switch, and when the control circuit determines that the output voltage is less than the undervoltage lockout value, the control circuit turns off the switch.

12 . The power supply as claimed in claim 5 , further comprising:
a main circuit board, configured to configure the conversion circuit and the auxiliary power circuit, and the main circuit board placed on an inner surface of a housing, wherein a side of the main circuit board adjacent to the inner surface is a backside, and the backside comprises:
a specific block, comprising a plurality of fixed contacts, and the plurality of fixed contacts comprising the first output terminal, the second output terminal, and a third output terminal coupled to the auxiliary power circuit, and
a circuit board, configured to configure the output control circuit, and the circuit board comprising:
a plurality of soldering pads, formed on a side, which attached to the specific block, of the circuit board, and the plurality of soldering pads correspondingly welded to the plurality of fixed contacts, and
a control chip, and used as the switch circuit, and disposed on the circuit board,
wherein the circuit b

Assignees

• Delta Electronics Inc

Inventors

• Hsu Cheng-Chan
• Lai Chien-An
• Chen Guo-Ning
• Hsiao Yung-Yuan
• Chang kai-lin

Classifications

• H02J4/25

  for transfer of electric power between AC and DC networks, e.g. for supplying the DC section within a load from an AC mains system · CPC title

• G06F1/305

  in the event of power-supply fluctuations · CPC title

• H02M3/158

  including plural semiconductor devices as final control devices for a single load · CPC title

• H02M1/0032

  Control circuits allowing low power mode operation, e.g. in standby mode · CPC title

• H02M1/42

  Circuits or arrangements for compensating for or adjusting power factor in converters or inverters · CPC title