Circuit for paralleled power supply module to implement automatic current-sharing in proportion

Patent metadata

Field	Value
Publication number	US-9570984-B2
Application number	US-201314413517-A
Country	US
Kind code	B2
Filing date	Jul 8, 2013
Priority date	Jul 20, 2012
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A circuit for a paralleled power supply module to implement automatic current-sharing in proportion comprises: at least two power supply modules, and an output current feedback loop and an output voltage adjusting loop corresponding to each power supply module. Wherein, the output current feedback loop comprises an output current sample amplifying unit, configured to collect output current of a power supply module and amplify the collected output current into a voltage signal according to an inverse proportion of the output proportion set for each power supply module, and a current-sharing controller unit configured to adjust an output voltage of each power supply module; and the output voltage adjusting loop is configured to compare the output voltage of the current-sharing controller unit with a reference voltage, and control the output voltage of the power supply module to adjust the output current.

First claim

The invention claimed is:

1. A circuit for a paralleled power supply module to implement automatic current-sharing in proportion, comprising:
at least two power supply modules, and an output current feedback loop and an output voltage adjusting loop corresponding to each power supply module, wherein,
the output current feedback loop comprises: an output current sample amplifying unit and a current-sharing controller unit;
the output current feedback loop is configured to: feed back an output current of the power supply module to the output voltage adjusting loop corresponding to each power supply module;
the output current sample amplifying unit is configured to: collect the output current of the power supply module, and amplify the collected output current into a voltage signal wherein a proportion of each amplified voltage signal is inversed to a preset output proportion of each power supply module;
the current-sharing controller unit is configured to: adjust an output voltage of each power supply module; wherein, an inverted input end of the current-sharing controller unit is connected to an output signal of the output current sample amplifying unit; a non-inverted input end is connected to a current-sharing bus through a resistance; and an output end is connected to the output voltage adjusting loop; and
the output voltage adjusting loop is configured to compare the output voltage of the current-sharing controller unit with a reference voltage, and control the output voltage of the power supply module to adjust the output current.

2. The circuit according to claim 1 , wherein: the preset output proportion of each power supply module is a proportion of a maximum output power of each power supply module, a proportion of a rated power of each power supply module or a proportion of a maximum output current of each power supply module.

3. The circuit according to claim 1 , wherein: the output voltage adjusting loop comprises a voltage error amplifier unit, a signal generation and driver unit and a main power conversion unit; wherein,
the voltage error amplifier unit is configured in that: the non-inverted input end of the voltage error amplifier unit is connected to an output voltage reference signal generated after comparing an output voltage of the current-sharing controller and the reference voltage; the inverted input end is connected to a real output voltage feedback signal of the power supply module; and an output end is connected to an input end of the signal generation and driver unit;
the signal generation and driver unit is configured to: according to an output signal of the voltage error amplifier unit, send a driving signal to control the output voltage of the power supply module to the main power conversion unit; wherein, an input end of the signal generation and driver unit is connected to the output signal of the voltage error amplifier unit, and an output end is connected to an input end of the main power conversion unit; and
the main power conversion unit is configured to: control the output voltage of the power supply module to adjust the output current.

4. The circuit according to claim 1 , wherein: the current-sharing controller unit is a current-sharing controller chip or an operational amplifier.

5. The circuit according to claim 2 , wherein: the output voltage adjusting loop comprises a voltage error amplifier unit, a signal generation and driver unit and a main power conversion unit; wherein,
the voltage error amplifier unit is configured in that: the non-inverted input end of the voltage error amplifier unit is connected to an output voltage reference signal generated after comparing an output voltage of the current-sharing controller and the reference voltage; the inverted input end is connected to a real output voltage feedback signal of the power supply module; and an output end is connected to an input end of the signal generation and driver unit;
the signal generation and driver unit is configured to: according to an output signal of the voltage error amplifier unit, send a driving signal to control the output voltage of the power supply module to the main power conversion unit; wherein, an input end of the signal generation and driver unit is connected to the output signal of the voltage error amplifier unit, and an output end is connected to an input end of the main power conversion unit; and
the main power conversion unit is configured to: control the output voltage of the power supply module to adjust the output current.

6. The circuit according to claim 3 , wherein: the output current sample amplifying unit comprises an output current sampling unit and a current sample amplifying unit, and an input end of the current sample amplifying unit is connected to an output end of the output current sampling unit.

7. The circuit according to claim 3 , wherein: the output voltage adjusting loop further comprises an output voltage feedback unit, configured to: feed a real output voltage of the power supply module back to the inverted input end of the voltage error amplifier unit.

8. The circuit according to claim 5 , wherein: the output current sample amplifying unit comprises an output current sampling unit and a current sample amplifying unit, and an input end of the current sample amplifying unit is connected to an output end of the output current sampling unit.

9. The circuit according to claim 5 , wherein: the output voltage adjusting loop further comprises an output voltage feedback unit, configured to: feed a real output voltage of the power supply module back to the inverted input end of the voltage error amplifier unit.

10. The circuit according to claim 6 , wherein: the output current sampling unit is configured to: be connected to a positive end or a negative end of an output loop of the power supply module.

11. The circuit according to claim 6 , wherein: the output current sample unit is a two-terminal shunt, a four-terminal shunt, a current transformer or a current sensor.

12. The circuit according to claim 8 , wherein: the output current sampling unit is configured to: be connected to a positive end or a negative end of an output loop of the power supply module.

13. The circuit according to claim 10 , wherein: the output current sample unit is a two-terminal shunt, a four-terminal shunt, a current transformer or a current sensor.

Assignees

• Zte Corp

Inventors

• Yang Yundong
• Zheng Dacheng
• Wang Fangchun
• Gao Yanghuai
• Zhou He
• Li Bei

Classifications

• H02J1/106

  for load balancing, symmetrisation, or sharing · CPC title

• H02J1/102

  being switching converters (H02J1/108, H02J1/12 take precedence) · CPC title

• H02M3/1584 Primary

  with a plurality of power processing stages connected in parallel · CPC title

• H02M3/158

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

• H02J7/16

  Regulation of the charging current or voltage by variation of field · CPC title