Storage battery management unit device for A-type fire emergency lighting centralized power supply

Abstract

The utility model discloses a storage battery management unit device for an A-type fire-fighting emergency lighting centralized power supply, which belongs to the field of fire-fighting emergency lighting and has the advantages that a charging circuit power device and a discharging circuit power device are shared, a power device of a charging loop does not need to be additionally arranged, and the hardware cost is reduced. The circuit mainly comprises a storage battery, the storage battery is connected with a DC36V output end through a storage battery management unit, the storage battery management unit comprises a digital power supply control IC, an MOS tube Q1 and an MOS tube Q2, the DC36V output end is connected with a D pole of the MOS tube Q1, a G pole of the MOS tube Q1 is connected with an HO end of the digital power supply control IC, and a G pole of the MOS tube Q2 is connected with an LO end of the digital power supply control IC. The storage battery management device is mainly used for storage battery management of the A-type fire-fighting emergency lighting centralized power supply.

Description

Technical Field

[0001] This utility model relates to the field of fire emergency lighting, and more specifically, to a battery management unit device for a centralized power supply for Type A fire emergency lighting. Background Technology

[0002] Existing centralized power supplies for Type A fire emergency lighting with battery boost functionality typically employ a separate design for charging and discharging. The charging section uses an independent, fixed-power charger connected to the battery via a charging switch control circuit. The discharging section uses an independent boost circuit to boost the battery's DC12V or DC24V voltage to output DC36V. Power devices for the charging and discharging circuits cannot be shared, increasing hardware costs. Because national standards impose strict limits on charging time, ensuring the battery is fully charged within 24 hours, the charger circuit's output power is usually less than 1 / 20C (where C is the total battery capacity) to maintain cost-effectiveness. In applications requiring longer emergency battery life, the battery capacity needs to be increased exponentially. In this case, to ensure the battery is fully charged within the fixed 24-hour timeframe, the charger's power also needs to be increased exponentially, requiring product design changes and charger replacements.

[0003] In typical applications, batteries don't require significantly larger capacities. Designing a high-power charger from the outset results in excessive hardware redundancy and wasted costs. Therefore, this traditional approach of separating charging and discharging components presents a trade-off between the flexibility of the device's application scenarios and cost. Utility Model Content

[0004] The purpose of this utility model is to provide a battery management unit device for a centralized power supply for Type A fire emergency lighting, in which the power devices for charging and discharging circuits are shared, eliminating the need for additional power devices for the charging circuit and reducing hardware costs.

[0005] This utility model is achieved through the following technical solution:

[0006] A battery management unit device for a centralized power supply for Type A fire emergency lighting includes a battery connected to a DC 36V output terminal via the battery management unit. The battery management unit includes a digital power control IC, MOSFETs Q1 and Q2. The DC 36V output terminal is connected to the drain (D) terminal of MOSFET Q1. The gate (G) terminal of MOSFET Q1 is connected to the HO terminal of the digital power control IC. The gate (G) terminal of MOSFET Q2 is connected to the LO terminal of the digital power control IC. The drain (D) terminal of MOSFET Q2, the source (S) terminal of MOSFET Q1, and the HS terminal of the digital power control IC are all connected to an inductor L1. The inductor L1 is also connected to the battery. An output filter capacitor C2 is connected in parallel across the battery. A current sensing resistor R2 is connected to the I-sense terminal of the digital power control IC.

[0007] Furthermore, the DC36V output terminal is also connected in parallel with an input filter capacitor C1. The I-sense terminal of the digital power control IC and the current sensing resistor R2 are respectively connected to the negative terminal of the input filter capacitor C1, and the positive terminal of the input filter capacitor C1 is connected to the drain terminal of the MOSFET Q1.

[0008] Furthermore, it also includes an AC / DC power module, which is connected to the DC36V output terminal. The AC / DC power module is also connected to the battery management unit, and the AC / DC power module is connected to the AC220V power supply. The DC36V output terminal is connected to the external load.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] 1. The charging and discharging circuits share the same power devices, eliminating the need for additional power devices in the charging circuit: This reduces hardware costs; the charging power can be flexibly adjusted by the digital power control IC, theoretically reaching the same maximum as the discharging power; the charging current can be flexibly adjusted between 0C and 1 / 2C (C being the battery capacity before capacity expansion); when expanding the battery capacity, the battery capacity increases to 4 times the original capacity, and theoretically, it can be fully charged in as little as 8 hours, without incurring costs for additional power devices in the charging circuit.

[0011] 2. Replacing traditional analog power management ICs with digital power ICs combines power control and system control into a single device: This eliminates the need for an additional MCU, enabling rational allocation of charging and discharging logic and simplifying control logic. Switching from analog to digital power ICs allows for flexible control of charging current and voltage, optimizing battery charging and discharging modes and extending battery life. Furthermore, digital power ICs, primarily based on software control logic, allow for flexible selection from multiple manufacturers and models, unlike analog ICs which have a more limited selection. Attached Figure Description

[0012] Figure 1This is the logical architecture diagram of this utility model;

[0013] Figure 2 This is a circuit diagram of the battery management unit of this utility model;

[0014] Figure 3 This is a schematic diagram of the current in the power circuit of the Buck step-down charging process of the battery according to this utility model;

[0015] Figure 4 This is a schematic diagram of the current in the power circuit of the battery Boost discharge process of this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Example 1

[0018] like Figure 2 As shown, a battery management unit device for a centralized power supply for Type A fire emergency lighting includes a battery. The battery is connected to a DC 36V output terminal through the battery management unit. The battery management unit includes a digital power control IC, MOSFETs Q1 and Q2. The DC 36V output terminal is connected to the drain (D) terminal of MOSFET Q1. The gate (G) terminal of MOSFET Q1 is connected to the HO terminal (upper MOSFET drive output) of the digital power control IC. The gate (G) terminal of MOSFET Q2 is connected to the LO terminal (lower MOSFET drive output) of the digital power control IC. The drain (D) terminal of MOSFET Q2, the source (S) terminal of MOSFET Q1, and the HS terminal (upper MOSFET drive reference) of the digital power control IC are all connected to an inductor L1. The inductor L1 is also connected to the battery. An output filter capacitor C2 is connected in parallel across the battery. The I-sense terminal (current sampling) of the digital power control IC is connected to a current sensing resistor R2. The digital power control IC samples the voltage of the current sensing resistor R2 and controls the duty cycle of the complementary output PWM waveforms of the driving MOSFETs Q1 and Q2 to achieve charging and discharging current control.

[0019] Example 2

[0020] like Figure 1 – Figure 2As shown, a battery management unit device for a centralized power supply for type A fire emergency lighting is provided. The DC 36V output terminal is further connected in parallel with an input filter capacitor C1. The I-sense terminal (current sampling) of the digital power control IC and the current sensing resistor R2 are respectively connected to the negative terminal of the input filter capacitor C1. The positive terminal of the input filter capacitor C1 is connected to the drain terminal of the MOSFET Q1. It also includes an AC / DC power module (existing technology), which is connected to the DC 36V output terminal. The AC / DC power module is also connected to the battery management unit and to an AC 220V power supply. The DC 36V output terminal is connected to an external load. Other aspects are the same as in Embodiment 1.

[0021] The current diagram of the power circuit during the Buck charging process of the battery is shown below. Figure 3 As shown. Stage 1: MOSFET Q1 is on, MOSFET Q2 is off, and the current flow is as follows. Figure 3 As shown by the solid line; Stage Two: MOSFET Q1 is off, MOSFET Q2 is on, and the current flow is as follows. Figure 3 As shown by the dashed line, the 36V input power source on the left is the battery on the right, which is the output load. This achieves step-down charging, reducing the voltage from 36V to 12V to charge the battery.

[0022] The current diagram of the power circuit during the battery Boost discharge process is shown below. Figure 4 As shown. Stage 1: MOSFET Q1 is off, MOSFET Q2 is on, and the current flow is as follows. Figure 4 As shown by the solid line; Stage Two: MOSFET Q1 is on, MOSFET Q2 is off, and the current flow is as follows. Figure 4 As shown by the dashed line, the battery on the right is the input power supply, and the 36V on the left is the output load. This implements a boost converter, increasing the voltage from 12V to 36V before outputting it to the subsequent switching circuit.

Claims

1. A battery management unit device for a centralized power supply for Type A fire emergency lighting, comprising a battery connected to a DC 36V output terminal via a battery management unit, characterized in that: The battery management unit includes a digital power control IC, MOSFETs Q1 and Q2. The DC 36V output terminal is connected to the drain (D) of MOSFET Q1. The gate (G) of MOSFET Q1 is connected to the HO terminal of the digital power control IC. The gate (G) of MOSFET Q2 is connected to the LO terminal of the digital power control IC. The drain (D) of MOSFET Q2, the source (S) of MOSFET Q1, and the HS terminal of the digital power control IC are all connected to inductor L1. Inductor L1 is also connected to a battery. An output filter capacitor C2 is connected in parallel across the battery. The I-sense terminal of the digital power control IC is connected to a current sensing resistor R2.

2. The battery management unit device for a centralized power supply for type A fire emergency lighting according to claim 1, characterized in that: The DC36V output terminal is also connected in parallel with an input filter capacitor C1. The I-sense terminal of the digital power control IC and the current sensing resistor R2 are respectively connected to the negative terminal of the input filter capacitor C1, and the positive terminal of the input filter capacitor C1 is connected to the drain terminal of the MOSFET Q1.

3. The battery management unit device for a centralized power supply for type A fire emergency lighting according to claim 1, characterized in that: It also includes an AC / DC power module, which is connected to the DC36V output terminal. The AC / DC power module is also connected to the battery management unit. The AC / DC power module is connected to the AC220V power supply, and the DC36V output terminal is connected to the external load.

Images