Base station power supply external working condition detection circuit and base station power supply

Abstract

The utility model discloses a kind of base station power supply external working condition detection circuit and base station power supply, by battery cluster, detection circuit, switching circuit and external working condition module composition;External working condition module is simplified into parallel load and power supply based on Thevenin equivalent theorem, and its negative pole is connected with the negative pole of battery cluster through switching circuit;Detection circuit is composed of series resistance branch and bias resistance branch.Based on the external working condition detection circuit of this base station power supply, the state of external working condition module can be detected by voltage value sampling of specified point, realize such as detecting charger voltage, charger / load access and removal, pre-charge and discharge state etc., compared with the way of designing a detection circuit for each detection requirement in prior art, the low-side low-voltage battery management architecture of the application based on base station power supply, using very little peripheral device can realize the detection of multiple external working conditions, with the advantages of simple circuit, less resource usage, multiple working condition types can be detected.

Description

Technical Field

[0001] This utility model belongs to the field of battery management technology, specifically, it relates to an external operating condition detection circuit for base station power supply and a base station power supply. Background Technology

[0002] As a core energy guarantee device for communication network infrastructure, base station power supplies must be designed and their performance adapted to the scenario requirements of all-weather, high-reliability operation of base stations, while also taking into account practical application challenges such as deployment in remote areas and energy conservation and emission reduction.

[0003] Base station power supplies need to perform functions such as detecting charger voltage, detecting charger / load connection and removal, and detecting pre-charge and discharge status. These functions determine power supply stability, equipment lifespan, and emergency response capabilities.

[0004] In the existing technology, multiple detection circuits need to be configured for various detection functions, and each detection circuit can only perform one or two of the above functions. Summary of the Invention

[0005] This utility model provides a base station power supply external condition detection circuit and base station power supply. Based on the base station power supply's battery management system (BMS) architecture, it uses a simple voltage sampling circuit and bias resistor, combined with charge / discharge and pre-charge / discharge functions, to realize functions such as detecting charger voltage, charger / load connection and removal, and pre-charge / discharge status. It uses fewer external components and has simpler logic.

[0006] This utility model is achieved using the following technical solution: A base station power supply external operating condition detection circuit is proposed, comprising: The battery cluster, composed of multiple cells connected in series, supplies power to the base station and its external systems. The external operating condition module, based on Thevenin's equivalent theorem, is simplified to a parallel load RL and a power supply Vo; the positive terminal of the external operating condition module is connected to the positive terminal of the battery cluster, and its negative terminal is connected to the negative terminal of the battery cluster through a switching circuit. The detection circuit consists of a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first resistor R1, the third resistor R3, and the fourth resistor R4 are connected in series, with the first resistor R1 connected to the positive terminal of the battery cluster and the fourth resistor R4 connected to the negative terminal of the battery cluster. One end of the second resistor R2 is connected between the first resistor R1 and the third resistor R3, and the other end is connected to the negative terminal of the external operating condition module. The switching circuit consists of two parallel branches: one branch is composed of a charge / discharge switch K1, and the other branch is composed of a pre-charge / discharge switch K2 and a pre-charge / discharge resistor R5 connected in series.

[0007] In some embodiments of this application, the precharge / discharge switch K2 is one or more relays controlled by the MCU or AFE chip of the base station power supply.

[0008] In some embodiments of the application, the external operating condition module is a resistive load, a resistive-capacitive load, a ballast, an inverter, or a BMS system charger for the base station power supply.

[0009] A base station power supply is proposed, characterized in that it includes an external operating condition detection circuit for the base station power supply; the external operating condition detection circuit for the base station power supply includes: The battery cluster, composed of multiple cells connected in series, supplies power to the base station and its external systems. The external operating condition module, based on Thevenin's equivalent theorem, is simplified to a parallel load RL and a power supply Vo; the positive terminal of the external operating condition module is connected to the positive terminal of the battery cluster, and its negative terminal is connected to the negative terminal of the battery cluster through a switching circuit. The detection circuit consists of a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first resistor R1, the third resistor R3, and the fourth resistor R4 are connected in series, with the first resistor R1 connected to the positive terminal of the battery cluster and the fourth resistor R4 connected to the negative terminal of the battery cluster. One end of the second resistor R2 is connected between the first resistor R1 and the third resistor R3, and the other end is connected to the negative terminal of the external operating condition module. The switching circuit consists of two parallel branches: one branch is composed of a charge / discharge switch K1, and the other branch is composed of a pre-charge / discharge switch K2 and a pre-charge / discharge resistor R5 connected in series.

[0010] Compared with the prior art, the advantages and positive effects of this utility model are as follows: The base station power supply external condition detection circuit and base station power supply proposed in this utility model consist of a battery cluster, a detection circuit, a switching circuit, and an external condition module. The external condition module is simplified to a parallel load and power supply based on Thevenin's equivalent theorem, and its negative terminal is connected to the negative terminal of the battery cluster through the switching circuit. The detection circuit consists of a series resistor branch and a bias resistor branch. Based on this base station power supply external condition detection circuit, the status of the external condition module can be detected by sampling the voltage value at a specified point, realizing functions such as detecting charger voltage, charger / load connection and removal, and pre-charge / discharge status. Compared with the prior art's approach of designing a detection circuit for each detection requirement, this application, based on the low-side low-voltage battery management architecture of the base station power supply, can realize the detection of multiple external conditions with very few external components, and has the advantages of simple circuit, low resource usage, and many detectable condition types.

[0011] Other features and advantages of this utility model will become clearer after reading the detailed description of the embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a circuit structure diagram of the base station power supply external operating condition detection circuit proposed in this application; Figure 2 This is a schematic diagram of the voltage sampling points of the base station power supply external operating condition detection circuit in this application. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0017] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] The low-side low-voltage battery BMS solution for base station power supply is a battery management solution designed for the 48V low-voltage backup power system of base stations (usually composed of multiple batteries connected in series). Its core feature is that the charge and discharge control switch is deployed at the negative terminal of the battery pack, and the safe and stable operation of the base station backup battery is ensured through detection, control and protection mechanisms.

[0019] The base station power supply external operating condition detection circuit proposed in this application is designed based on the low-side low-voltage battery BMS architecture. With simple detection logic, it can realize the detection of charger voltage, charger / load access and removal, and pre-charge and discharge status of the base station power supply, without the need to design multiple detection circuits for each detection requirement.

[0020] Specifically, the base station power supply external operating condition detection circuit proposed in this application is as follows: Figure 1 As shown, it consists of a battery cluster, a detection circuit, a switching circuit, and an external operating condition module. Among them, The battery cluster consists of multiple cells connected in series, providing power to the base station and its external systems.

[0021] External operating condition modules include resistive loads, resistive-capacitive loads, ballasts, inverters, etc., outside the base station power supply. Figure 1 As shown, according to Thevenin's equivalent theorem, the load RL and power supply Vo are simplified to a parallel connection. The positive terminal of the external operating condition module is connected to the positive terminal of the battery cluster, and the negative terminal of the external operating condition module is connected to the negative terminal of the battery cluster through a switching circuit.

[0022] The switching circuit consists of two parallel branches: one branch is formed by the charge / discharge switch K1, and the other branch is formed by the pre-charge / discharge switch K2 and the pre-charge / discharge resistor R5 connected in series. This switching circuit is connected between the negative terminal of the battery pack and the negative terminal of the external operating module. The system controls the on / off state of the battery pack and the external operating module through this switching circuit. When the charge / discharge switch K1 is closed, the battery pack charges and discharges for the external operating module; when the pre-charge / discharge switch K2 is closed, the battery pack pre-charges and discharges for the external operating module.

[0023] The detection circuit consists of a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first resistor R1, the third resistor R3, and the fourth resistor R4 are connected in series, with the first resistor R1 connected to the positive terminal of the battery cluster and the fourth resistor R4 connected to the negative terminal of the battery cluster. One end of the second resistor R2 is connected between the first resistor R1 and the third resistor R2, and the other end is connected to the negative terminal of the external operating condition module.

[0024] Based on the above circuit, this application combines bias voltage sampling method to detect the external operating conditions of the base station power supply.

[0025] refer to Figure 2 As shown, sampling points Ua, U1, and U2 are set. According to Kirchhoff's current law: (U2-Ua) / R1+(U3-Ua) / R2 = Ua / (R3+R4) (1), U1 / R4 = Ua / (R3+R4) (2); Combining (1) and (2) and simplifying, we get: U3=((R2 / R1+1)*(R3+R4)*U1) / R4+(R2*U1) / R4-(R2*U2) / R1 (3); The external operating condition, i.e. the negative voltage U3 of the load under test, can be calculated from formula (3). Among them, U2 is the battery cluster voltage, which can be obtained by collecting the sum of individual cells by an AFE chip (Analog Front-End Chip) or by building a separate voltage sampling circuit. U1 is obtained by sampling through an AD chip or MCU.

[0026] The following describes the process of using the above detection circuit to detect the external operating condition module of the base station power supply, taking a battery cluster voltage of 50V as an example, through several embodiments.

[0027] Example 1: Ballast testing.

[0028] In a base station power supply system, the ballast is a driving component designed for the base station's light source. In practical applications, the ballast's operating status needs to be monitored. When the equivalent power supply Vo of the external operating condition module is 60±2V, it indicates that the ballast is in power supply mode.

[0029] The testing steps include: 1. Disconnect the charge / discharge switch K1 and the pre-charge / discharge switch K2.

[0030] 2. Acquire the voltage of U1 through the AD sampling circuit.

[0031] 3. Calculate the negative voltage U3 of the equivalent power supply Vo of the external operating condition module according to formula (3).

[0032] 4. Calculate the equivalent power supply voltage Vo = U2 - U3 of the external operating condition module.

[0033] If U1∈[2.2353, 2.4706] V, and the equivalent power supply voltage Vo of the external operating condition module is within the range of 58V-62V, it can be determined that the external operating condition is in ballast-powered condition. If U1∉[2.2353V, 2.4706V], and the voltage of the equivalent power supply Vo of the external operating condition module does not meet 60±2V, it indicates that the ballast is not in power supply condition.

[0034] Example 2: Inverter charging handshake detection.

[0035] When the equivalent power supply voltage Vo of the external operating condition module is 15V for 1 second and 10V for 2 seconds, the external operating condition is determined to be an inverter.

[0036] The testing steps include: 1. Close the charge / discharge switch K1 and open the pre-charge / discharge switch K2.

[0037] 2. Acquire the voltage of U1 through the AD sampling circuit.

[0038] 3. Calculate the negative voltage U3 of the equivalent power supply Vo of the external operating condition module according to formula (3).

[0039] 4. Calculate the equivalent power supply Vo of the external operating condition module: Vo = U2 - U3.

[0040] If the following requirements are met: when U1=5V, Vo is 15V; when U1=5.294V, Vo is 10V, then the external operating condition is determined to be an inverter. The duration can be determined by the MCU timer.

[0041] Example 3: Load removal detection.

[0042] When the system enters the protection state after an overcurrent / short circuit fault, the equivalent resistance RL of the external operating condition module is greater than 0, and the charge / discharge switch K1 and the pre-charge / discharge switch K2 are disconnected. At this time, it is necessary to check whether the load has been removed.

[0043] The testing steps include: 1. Acquire the voltage of U1 through the AD sampling circuit.

[0044] 2. Calculate the negative voltage U3 of the equivalent power supply Vo of the external operating condition module according to formula (3).

[0045] 3. Calculate the equivalent power supply Vo = U2 - U3 for the load under test.

[0046] When U1 = 5.882V, Vo = 0V, indicating the load has not been removed. When U1 ∈ [4.545, 5.882], the load changes due to power failure but is not removed. When U1 = 4.545V, Vo is in a floating state, indicating the load has been removed.

[0047] Example 4: Charger testing.

[0048] When a charging overcurrent / voltage fault occurs in the system, it is necessary to check whether the charger has been removed.

[0049] The testing steps include: 1. Acquire the voltage of U1 through the AD sampling circuit.

[0050] 2. Calculate the negative voltage U3 of the equivalent power supply Vo of the load under test according to formula (3).

[0051] 3. Calculate the equivalent power supply Vo of the external operating condition module: Vo = U2 - U3.

[0052] When U1 > 2.9411V and Vo is less than 50V, it is determined that the charger has been removed.

[0053] Example 5: Pre-charge status determination.

[0054] When the system is powered on, to prevent arcing, the pre-charge and discharge switch K2 needs to be closed first. When the voltage difference between the external operating module voltage and the battery cluster voltage is less than 5V, the pre-charge is considered successful and the charge and discharge switch K1 can be closed. Otherwise, the charge and discharge switch K1 is not allowed to be closed.

[0055] The testing steps include: 1. Disconnect the charge / discharge switch K1 and close the pre-charge / discharge switch K2.

[0056] 2. Acquire the voltage of U1 through the AD sampling circuit.

[0057] 3. Calculate the negative voltage U3 of the equivalent power supply Vo of the external operating condition module according to formula (3).

[0058] 4. Calculate the equivalent power supply Vo of the external operating condition module: Vo = U2 - U3.

[0059] When U1 = 2.647V is detected, the equivalent power supply Vo voltage of the external operating condition module is 55V; when U1 = 3.2353V is detected, the equivalent power supply Vo voltage of the external operating condition module is 45V. That is, when U1 ∈ [2.647, 3.2353]V, the pre-charging is considered successful, and the charging and discharging switch K1 is allowed to be closed; otherwise, the charging and discharging switch K1 is not allowed to be closed.

[0060] It should be noted that the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A base station power supply external operating condition detection circuit, characterized in that, include: The battery cluster, composed of multiple cells connected in series, supplies power to the base station and its external systems. The external operating condition module, based on Thevenin's equivalent theorem, is simplified to a parallel load RL and a power supply Vo; the positive terminal of the external operating condition module is connected to the positive terminal of the battery cluster, and its negative terminal is connected to the negative terminal of the battery cluster through a switching circuit. The detection circuit consists of a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The first resistor R1, the third resistor R3, and the fourth resistor R4 are connected in series, with the first resistor R1 connected to the positive terminal of the battery cluster and the fourth resistor R4 connected to the negative terminal of the battery cluster. One end of the second resistor R2 is connected between the first resistor R1 and the third resistor R3, and the other end is connected to the negative terminal of the external operating condition module. The switching circuit consists of two parallel branches: one branch is composed of a charge / discharge switch K1, and the other branch is composed of a pre-charge / discharge switch K2 and a pre-charge / discharge resistor R5 connected in series.

2. The base station power supply external operating condition detection circuit according to claim 1, characterized in that, The pre-charge / discharge switch K2 is one or more relays, controlled by the MCU or AFE chip of the base station power supply.

3. The base station power supply external operating condition detection circuit according to claim 1, characterized in that, The external operating condition module is a resistive load, a resistive-capacitive load, a ballast, an inverter, or a BMS system charger for the base station power supply.

4. A base station power supply, characterized in that, Includes the base station power supply external operating condition detection circuit as described in any one of claims 1-3.

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