A charging and discharging control device for the backup power supply of a base station energy storage system

Abstract

The present invention discloses a charging and discharging control device for a backup power supply of a base station energy storage system, specifically relating to the technical field of DC power supplies for the power systems of communication base stations. The technical solution is as follows: It includes a charging and discharging control device, which comprises a charging and discharging logic control M1, a relay driving device, a voltage acquisition A1, and a voltage acquisition A2. The charging and discharging logic control M1 is electrically connected to the voltage acquisition A1, the voltage acquisition A1 is electrically connected to a charger, the charger is electrically connected to a load, the voltage acquisition A2 is electrically connected to a battery, the battery is electrically connected to a relay K1, the relay driving device is electrically connected to the relay K1, and the charger is electrically connected to the mains power. The beneficial effect of the present invention is that by using a single relay K1 to control the battery charging and discharging process, the system connection is simplified, the cost is reduced, and the reliability is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of DC power supplies for communication base station power systems, and particularly to a charge and discharge control device for a backup power supply of a base station energy storage system. Background Art

[0002] Currently (the charge and discharge control system of the cascade lithium battery in the CN108110862A communication base station) usually uses the unidirectional conduction characteristic of a diode in cooperation with a charging relay and a discharging relay to independently control the charging circuit and the discharging circuit.

[0003] The prior art has the following deficiencies: When using a diode to control the charge and discharge circuit for a long time, the diode often decays in lifespan due to aging and poor heat dissipation, and is easily damaged during use, resulting in the entire system being unable to operate normally. Currently, the battery charge and discharge circuits are separated, and using multiple relays to control the charge and discharge system has a high cost.

[0004] Therefore, it is very necessary to invent a charge and discharge control device for a backup power supply of a base station energy storage system. Summary of the Invention

[0005] To this end, the present invention provides a charge and discharge control device for a backup power supply of a base station energy storage system. By setting a relay K1 to control the battery charge and discharge process, adopting a scheme where the same branch is used for charging and discharging, and judging by collecting the load terminal voltage and the battery terminal voltage, the system connection is simplified, the cost is reduced, and the reliability is increased to solve the problems in the background art.

[0006] To achieve the above object, the present invention provides the following technical solution: A charge and discharge control device for a backup power supply of a base station energy storage system, including a charge and discharge control device. The charge and discharge control device includes a charge and discharge logic control M1, a relay driving device, a voltage acquisition A1, and a voltage acquisition A2. The charge and discharge logic control M1 is electrically connected to the voltage acquisition A1. The voltage acquisition A1 is electrically connected to a charger. The charger is electrically connected to a load. The voltage acquisition A2 is electrically connected to a battery. The battery is electrically connected to a relay K1. The relay driving device is electrically connected to the relay K1. The charger is electrically connected to the commercial power.

[0007] Preferably, when the commercial power exists, the charger provides electrical energy to drive the load.

[0008] Preferably, the voltage acquisition A1 in the charge and discharge control device is used to detect whether the charger voltage exists.

[0009] Preferably, the voltage acquisition device A2 is used to detect that the battery voltage is lower than the set threshold.

[0010] Preferably, the charge and discharge logic control M1 is used to control the relay driving device to drive the relay K1 to close.

[0011] Preferably, after the voltage acquisition A2 detects that the battery voltage is full, the charge and discharge logic control M1 controls the relay driving device to drive the relay K1 to open.

[0012] Preferably, under the state of power failure of the commercial power, the voltage of the charger disappears, and the voltage acquisition A1 in the charge and discharge control device acquires that the voltage of the charger decreases. When the battery voltage acquired by the voltage acquisition A2 is within the normal range, the charge and discharge logic control M1 controls the relay driving device to drive the relay K1 to close.

[0013] Preferably, when the battery is emptied, the voltage acquisition A2 detects that the battery voltage is lower than the normal threshold, and the charge and discharge control device controls the relay K1 to open, and the battery discharge ends. When the commercial power is restored, the charger and the load are directly connected, and the charger continues to supply power to the load.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. Usually, the charging circuit and the discharging circuit of the base station energy storage system use the one-way conduction characteristic of the sampling diode to independently control the charging circuit and the discharging circuit. The charging circuit and the discharging circuit are independent, and two-way relays are required, resulting in a high cost. The diode works in a large current state for a long time, reducing its lifespan and being prone to damage. This device adopts a scheme of using the same branch for charging and discharging, and judges by collecting the load terminal voltage and the battery terminal voltage;

[0016] 2. When the commercial power exists, the load is powered by the charger. When the commercial power fails, the relay K1 closes, and the load is powered by the lithium battery. When the commercial power exists and the battery voltage is insufficient, the relay K1 closes and the lithium battery is charged. After the charging is completed, the relay K1 opens to prevent overcharging of the battery. When the commercial power fails and the battery voltage is normal, the relay K1 closes and the battery discharges. When the battery discharges to the minimum threshold voltage, the relay K1 opens to stop discharging, preventing over-discharging of the battery. This device only uses one relay K1 to control the battery charging and discharging process, simplifies the system connection, reduces the cost, and increases the reliability. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the system structure of the present invention provided by the present invention;

[0018] Figure 2 It is an example schematic diagram of the system structure of the present invention provided by the present invention.

[0019] In the figure: 1. Charge and discharge control device; 2. Charge and discharge logic control M1; 3. Relay driving device; 4. Voltage acquisition A1; 5. Charger; 6. Commercial power; 7. Load; 8. Voltage acquisition A2; 9. Battery; 10. Relay K1. Detailed implementation manners

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for illustrating and explaining the present invention, and are not used to limit the present invention.

[0021] Referring to the attached Figure 1 - Figure 2 , a charging and discharging control device for a backup power supply of a base station energy storage system in this embodiment includes a charging and discharging control device 1. The charging and discharging control device 1 includes a charging and discharging logic control M12, a relay driving device 3, a voltage acquisition A14, and a voltage acquisition A28. The charging and discharging logic control M12 is electrically connected to the voltage acquisition A14. The voltage acquisition A14 is electrically connected to a charger 5. The charger 5 is electrically connected to a load 7. The voltage acquisition A28 is electrically connected to a 48V lithium battery 9. The 48V lithium battery 9 is electrically connected to a relay K110. The relay driving device 3 is electrically connected to the relay K110. The charger 5 is electrically connected to the commercial power 6.

[0022] Further, in the presence of the commercial power 6, the charger 5 provides electric energy to drive the load 7. The commercial power 6 is the conventional 220V civilian power on the market and provides electric energy to the charger 5.

[0023] Further, the voltage acquisition A14 in the charging and discharging control device 1 is used to detect whether the voltage of the charger 5 exists. When the voltage acquisition A14 in the charging and discharging control device 1 detects the existence of the voltage of the charger 5, and the voltage acquisition device A28 detects that the voltage of the battery 9 is lower than the set threshold, the charging and discharging logic control M12 controls the relay driving device 3 to drive the relay K110 to close, and the charger 5 charges the battery 9.

[0024] Further, the voltage acquisition device A28 is used to detect that the voltage of the battery 9 is lower than the set threshold. When the voltage acquisition A14 in the charging and discharging control device 1 detects the existence of the voltage of the charger 5, and the voltage acquisition device A28 detects that the voltage of the battery 9 is lower than the set threshold, the charging and discharging logic control M12 controls the relay driving device 3 to drive the relay K110 to close, and the charger 5 charges the battery 9.

[0025] Further, the charging and discharging logic control M12 is used to control the relay driving device 3 to drive the relay K110 to close, and the charger 5 charges the battery 9.

[0026] Further, after the voltage acquisition A28 detects that the battery 9 is fully charged, the charging and discharging logic control M12 controls the relay driving device 3 to drive the relay K110 to disconnect, and the charger 5 no longer charges the battery 9 to prevent overcharging of the battery 9.

[0027] Further, when the mains power supply 6 loses power, the voltage of the charger 5 disappears. The voltage acquisition A14 in the charge and discharge control device 1 acquires that the voltage of the charger 5 decreases. When the voltage acquisition A28 acquires that the voltage of the battery 9 is within the normal range, the charge and discharge logic control M12 controls the relay driving device 3 to drive the relay K110 to close, and the battery 9 is in the discharge mode.

[0028] Further, when the battery 9 is emptied, the voltage acquisition A28 detects that the battery voltage is lower than the normal threshold. When the battery 9 discharges to the minimum voltage threshold, the relay K110 disconnects to stop discharging, preventing the battery 9 from over-discharging. The charge and discharge control device 1 controls the relay K110 to disconnect, and the battery discharge ends. When the mains power supply 6 is restored, the charger 5 is directly connected to the load 7, and the charger 5 continues to supply power to the load 7.

[0029] The usage process of the present invention is as follows: The system consists of a charge and discharge control device 1, a charger 5, a battery 9, a relay 10, and a load 7. When the mains power supply 6 exists, the charger 5 provides electrical energy to drive the load 7. When the voltage acquisition A14 in the charge and discharge control device 1 detects that the voltage of the charger 5 exists, and the voltage acquisition device A28 detects that the voltage of the battery 9 is lower than the set threshold, the charge and discharge logic control M12 controls the relay driving device 3 to drive the relay K110 to close, and the charger 5 charges the battery 9. After the voltage acquisition A28 detects that the battery 9 is fully charged, the charge and discharge logic control M12 controls the relay driving device 3 to drive the relay K110 to disconnect, and the battery 9 is fully charged. When the mains power supply 6 loses power, the voltage of the charger 5 disappears. The voltage acquisition A14 in the charge and discharge control device 1 acquires that the voltage of the charger 5 decreases. When the voltage acquisition A28 acquires that the voltage of the battery 9 is within the normal range, the charge and discharge logic control M12 controls the relay driving device 3 to drive the relay K110 to close, and the battery 9 is in the discharge mode. When the battery 9 is emptied, the voltage acquisition A28 detects that the voltage of the battery 9 is lower than the normal threshold, and the charge and discharge control device 1 controls the relay K110 to disconnect, and the battery 9 discharge ends. When the mains power supply 6 is restored, the charger 5 is directly connected to the load 7, and the charger 5 continues to supply power to the load 7. The model of the battery 9 is set as a 48V lithium battery. When the mains power supply 6 exists, the load 7 is powered by the charger 5. When the mains power supply 6 loses power, the relay K110 closes, and the load 7 is powered by the lithium battery. When the mains power supply 6 exists and the voltage of the battery 9 is insufficient, the relay K110 closes to charge the lithium battery. After charging is completed, the relay K110 disconnects to prevent the battery 9 from overcharging; when the mains power supply 6 loses power and the voltage of the battery 9 is normal, the relay K110 closes and the battery 9 discharges. When the battery 9 discharges to the minimum voltage threshold, the relay K110 disconnects to stop discharging, preventing the battery 9 from over-discharging. This device only uses one relay K110 to control the charge and discharge process of the battery 9, simplifies the system connection, reduces costs, and increases reliability.

[0030] The above are only the preferred embodiments of the present invention. Any person skilled in the art may modify the present invention by using the technical solutions described above or modify them into equivalent technical solutions. Therefore, any simple modification or equivalent replacement made according to the technical solutions of the present invention falls within the scope of protection required by the present invention.

Claims

1. A charging and discharging control device for a backup power supply of a base station energy storage system, comprising a charging and discharging control device (1), characterized in that: The charge and discharge control device (1) includes a charge and discharge logic control M1 (2), a relay driving device (3), a voltage acquisition A1 (4), and a voltage acquisition A2 (8). The charge and discharge logic control M1 (2) is electrically connected to the voltage acquisition A1 (4), the voltage acquisition A1 (4) is electrically connected to a charger (5), the charger (5) is electrically connected to a load (7), the voltage acquisition A2 (8) is electrically connected to a battery (9), the battery (9) is electrically connected to a relay K1 (10), the relay driving device (3) is electrically connected to the relay K1 (10), the charger (5) is electrically connected to the mains power supply (6). When the mains power supply (6) is in an existing state, the charger (5) provides electrical energy to drive the load (7). The voltage acquisition A1 (4) in the charge and discharge control device (1) is used to detect whether the voltage of the charger (5) exists. The voltage acquisition A2 (8) is used to detect whether the voltage of the battery (9) is lower than a set threshold. The charge and discharge logic control M1 (2) is used to control the relay driving device (3) to drive the relay K1 (10) to close. After the voltage acquisition A2 (8) detects that the battery (9) is fully charged, the charge and discharge logic control M1 (2) controls the relay driving device (3) to drive the relay K1 (10) to open. When the mains power supply (6) is in a power failure state, the voltage of the charger (5) disappears. When the voltage acquisition A1 (4) in the charge and discharge control device (1) acquires that the voltage of the charger (5) decreases, and when the voltage of the battery (9) acquired by the voltage acquisition A2 (8) is within the normal range, the charge and discharge logic control M1 (2) controls the relay driving device (3) to drive the relay K1 (10) to close. When the battery (9) is discharged, the voltage acquisition A2 (8) detects that the battery voltage is lower than the normal threshold, and the charge and discharge control device (1) controls the relay K1 (10) to open, and the battery discharge ends. When the mains power supply (6) is restored, the charger (5) and the load (7) are directly connected, and the charger (5) continues to supply power to the load (7).

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