Power supply method, power supply device, and base station

• US 9,601,937 B2
• Filed: 12/03/2013
• Issued: 03/21/2017
• Est. Priority Date: 02/29/2012
• Status: Active Grant

• Current Assignee: Huawei Digital Power Technologies Company Limited (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Dong, Guangyu
• Primary Examiner(s): DIAO, M BAYE
• Application Number:
  US14/095,739
• Publication Number:
  US 20140084692A1
• Time in Patent Office: 1,204 Days
• Field of Search: 307/66, 320/101, 320/117
• US Class Current: 1/1
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H02J 7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging with circuits for polarity protection H02J7/0034
• CPC Class Codes: H02J 9/06 with automatic change-over , e.g. UPS systems
• CPC Class Codes: Y02B 10/70 Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies

Abstract

A method includes receiving currents supplied by a power generation apparatus, distributing the currents supplied by the power generation apparatus to a load and a lithium ion battery to ensure normal running of the load and enable the lithium ion battery to be charged. After the lithium ion battery is fully charge, the currents supplied by the power generation apparatus are distributed to the lead acid battery so that the lead acid battery is charged.

Claims

1. A base station, comprising:

a power supply device, configured to supply currents to a load of the base station to ensure normal running of the base station, the load of the base station comprising a transceiver device, configured to receive or transmit a signal; and

a control device, configured to control the transceiver device to receive or transmit the signal;

wherein the power supply device comprises;

a lead acid battery;

a lithium ion battery; and

an electrical energy control unit, configured to receive currents supplied by a power generation apparatus, distribute the currents supplied by the power generation apparatus to the load and the lithium ion battery to ensure normal running of the load and to enable the lithium ion battery to be charged, and when the lithium ion battery is fully charged, to distribute the currents supplied by the power generation apparatus to the load and the lead acid battery so that the lead acid battery is charged;

wherein when the electrical energy control unit detects that the currents supplied by the power generation apparatus are interrupted, the electrical energy control unit is further configured to first transfer a current provided by the lithium ion battery to the load, and then transfer a current provided by the lead acid battery to the load when the lithium ion battery is exhausted.

2. The base station according to claim 1, wherein the electrical energy control unit comprises:

an electrical energy controller, configured to receive the currents supplied by the power generation apparatus, to transfer currents required by the load among the currents to the load, and to transfer remaining currents except the currents required by the load among the currents to the lithium ion battery so that the lithium ion battery is charged;

a monitoring unit, configured to monitor a voltage of the lithium ion battery, and when the voltage of the lithium ion battery increases to a first preset voltage, to send a switching signal to a zero-time switching unit connected to the lithium ion battery and the lead acid battery to enable the zero-time switching unit to non-intermittently switch an energy storage unit connected to the electrical energy controller from the lithium ion battery to the lead acid battery, and to enable the electrical energy controller to transfer remaining currents to the lead acid battery so that the lead acid battery is charged, wherein the first preset voltage is the voltage of the lithium ion battery corresponding to 95% to 100% of a capacity of the lithium ion battery;

wherein the monitoring unit is further configured to monitor the currents supplied by the power generation apparatus, and when the currents supplied by the power generation apparatus are zero, to send a switching signal to the zero-time switching unit to enable a zero-switching unit to non-intermittently switch the energy storage unit connected to the electrical energy controller from the lead acid battery to the lithium ion battery, so that the current provided by the lithium ion battery is transferred to the load; and

the monitoring unit is further configured to monitor the voltage of the lithium ion battery, and when the voltage of the lithium ion battery decreases to a second preset voltage, to send a switching signal to the zero-time switching unit to enable the zero-time switching unit to non-intermittently switch the energy storage unit connected to the electrical energy controller from the lithium ion battery to the lead acid battery, so that the current provided by the lead acid battery is transferred to the load, wherein the second preset voltage is the voltage of the lithium ion battery corresponding to 0% to 20% of the capacity of the lithium ion battery; and

the zero-time switching unit, configured to non-intermittently switch the energy storage unit connected to the electrical energy controller between the lithium ion battery and the lead acid battery.

3. The base station according to claim 2, wherein the electrical energy controller is connected to the load of the base station, the monitoring unit, and the zero-time switching unit;

wherein the monitoring unit is connected to the zero-time switching unit and the lithium ion battery; and

wherein the zero-time switching unit is connected to the lithium ion battery and the lead acid battery.

4. The base station according to claim 1, wherein the power supply device further comprises a battery management system, configured to protect the lithium ion battery, to enable charge equalization of the lithium ion battery, and to prevent the lithium ion battery from over-charge, over-discharge and over-temperature.

5. The base station according to claim 1, wherein the power supply device further comprises the power generation apparatus, configured to supply currents to the load.

6. The base station according to claim 5, wherein the power generation apparatus comprises a solar photovoltaic module, wherein the solar photovoltaic module is configured to generate the currents using solar energy.

7. The base station according to claim 5, wherein the power generation apparatus comprises a wind power generation module, wherein the wind power generation module is configured to generate the currents using wind energy.

8. The base station according to claim 5, wherein the power generation apparatus comprises a fossil fuel machine power generation module, wherein the fossil fuel machine power generation module is configured to generate the currents using thermal energy from combustion of fuel.

9. The base station according to claim 5, wherein the power generation apparatus comprises a mains power supply module, wherein the mains power supply module is configured to receive currents supplied by the mains.