Emergency equipment power supply management control circuit based on two lithium batteries connected in series

Abstract

The utility model relates to the technical field of emergency equipment, in particular to an emergency equipment power supply management control circuit based on two lithium batteries connected in series, which comprises a charging circuit and a discharging circuit. The charging circuit comprises an input under-voltage turn-off control module, an over-temperature protection module, a charging current sampling module, a switching tube Q1, a current constant current control module, a battery over-charging protection module and a battery charging power tube control module. The discharge circuit comprises an AC detection module, a zero and live wire detection module, a battery over-discharge protection module, a battery discharge power tube control module, a discharge driving module and a switch tube Q2. Through the mutual electrical connection relation, power supply management control of the emergency equipment is realized under the condition of two lithium batteries connected in series, so that the lithium batteries are prevented from being damaged or the service life of the power supply system is prevented from being shortened due to overcharge, overdischarge and overcurrent. And through the over-temperature protection module, the influence on the performance and the safety of the lithium battery due to over-high temperature of the lithium battery is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of emergency equipment, in particular to a power supply management control circuit for emergency equipment based on two series-connected lithium batteries. Background Art

[0002] At present, the commonly used single lithium battery emergency management integrated circuit on the market has a small emergency lighting power, generally less than 4W, and a low illuminance, generally lower than 600lm. The voltage of a single lithium battery is low. When high-power and high-brightness emergency lighting or emergency fan air supply is required, the use of a single lithium battery emergency management circuit cannot meet the requirements, and multiple lithium batteries need to be added to meet the needs.

[0003] However, the multi-lithium battery system faces the problem of low reliability in practical applications. Specifically, in the actual application process, the lithium battery system may have various abnormal working states such as overcurrent, overvoltage, and over-discharge, and corresponding management and control of the lithium battery are required. At the same time, heat is generated during the charging and discharging process of multiple lithium batteries. If the heat distribution is uneven or the heat dissipation is poor, the battery temperature will be too high, affecting the performance and safety of the lithium battery. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a power supply management control circuit for emergency equipment based on two series-connected lithium batteries.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] A power supply management control circuit for emergency equipment based on two series-connected lithium batteries includes a charging circuit and a discharging circuit; the charging circuit includes an input undervoltage shutdown control module, an overtemperature protection module, a charging current sampling module, a switching transistor Q1, a current constant current control module, a battery overcharge protection module, and a battery charging power transistor control module; the discharging circuit includes an AC detection module, a live-neutral detection module, a battery over-discharge protection module, a battery discharging power transistor control module, a discharging drive module, and a switching transistor Q2;

[0007] The input end of the input undervoltage shutdown control module and the input end of the switching transistor Q1 are both connected to the VCC power supply; the output end of the switching transistor Q1 is respectively connected to the input end of the charging current sampling module, the input end of the battery overcharge protection module, the input end of the battery over-discharge protection module, the input end of the switching transistor Q2, and one of the two series-connected lithium batteries, namely BAT1; the other lithium battery BAT2 of the two series-connected lithium batteries is respectively connected to the input end of the battery overcharge protection module and the input end of the battery over-discharge protection module;

[0008] The output end of the charging current sampling module is electrically connected to the battery charging power transistor control module through a current constant current control module. The output end of the input undervoltage shutdown control module, the controlled end of the switching transistor Q1, and the output end of the battery overcharge protection module are respectively electrically connected to the battery charging power transistor control module. The overtemperature protection module is electrically connected to the battery charging power transistor control module, and the overtemperature protection module is used to detect the ambient temperature of the two series-connected lithium batteries and feedback to the battery charging power transistor control module when overheating.

[0009] The input end of the AC detection module is electrically connected to the live wire and neutral wire. The output end of the AC detection module is respectively electrically connected to the live wire and neutral wire detection module and the battery discharge power transistor control module. The output end of the battery over-discharge protection module and the battery charging power transistor control module are respectively electrically connected to the battery discharge power transistor control module. The battery discharge power transistor control module is electrically connected to the controlled end of the switching transistor Q2 through a discharge drive module. The output end of the switching transistor Q2 is electrically connected to the emergency device output end.

[0010] The emergency device output end is used to be electrically connected to an emergency device.

[0011] Further, the AC detection module includes an AC level detection unit and an AC resistance detection unit. The input ends of the AC level detection unit and the AC resistance detection unit are respectively electrically connected to the live wire and neutral wire. The output ends of the AC level detection unit and the AC resistance detection unit are respectively electrically connected to the battery discharge power transistor control module.

[0012] Further, the battery overcharge protection module includes a first battery overcharge protection unit and a second battery overcharge protection unit. The battery over-discharge protection module includes a first battery over-discharge protection unit and a second battery over-discharge protection unit.

[0013] The output end of the switching transistor Q1 is respectively electrically connected to the input ends of the first battery overcharge protection unit and the first battery over-discharge protection unit.

[0014] The input ends of the second battery overcharge protection unit and the second battery over-discharge protection unit are respectively electrically connected to the other lithium battery BAT2 in the two series-connected lithium batteries.

[0015] Further, the emergency device includes one or more of an emergency lighting lamp and an emergency fan.

[0016] Further, both the switching transistor Q1 and the switching transistor Q2 are MOS transistors.

[0017] The beneficial effects of the present utility model are:

[0018] The emergency equipment power supply management and control circuit based on two series-connected lithium batteries provided by the present utility model includes a charging circuit and a discharging circuit; the charging circuit includes an input undervoltage shutdown control module, an over-temperature protection module, a charging current sampling module, a switching transistor Q1, a current constant-current control module, a battery overcharge protection module, and a battery charging power transistor control module; the discharging circuit includes an AC detection module, a live-neutral detection module, a battery over-discharge protection module, a battery discharging power transistor control module, a discharging drive module, and a switching transistor Q2; and through the electrical connection relationships among them, the power supply management and control of the emergency equipment are realized under the condition of two series-connected lithium batteries. Specifically, a separate power supply method is adopted to charge the two series-connected lithium batteries simultaneously, and the voltages of the two lithium batteries are sampled simultaneously to prevent overcharging and over-discharging of the lithium batteries, thereby protecting the lithium batteries from damage or reduced lifespan caused by overcharging, over-discharging, and overcurrent in the power supply system. And by judging the AC power supply state, the switching state of the internal switching transistor Q2 is controlled to drive the emergency equipment. And through the over-temperature protection module, the ambient temperature of the two series-connected lithium batteries is detected and fed back to the battery charging power transistor control module when the temperature is too high, thereby effectively avoiding the influence of too high temperature of the lithium batteries on the performance and safety of the lithium batteries. Description of the Drawings

[0019] Figure 1 The figure shows a schematic diagram of the circuit modules of the emergency equipment power supply management and control circuit based on two series-connected lithium batteries;

[0020] Description of the Reference Numerals in the Drawings:

[0021] 1. Input undervoltage shutdown control module; 2. Battery charging power transistor control module; 3. Over-temperature protection module; 4. Charging current sampling module; 5. Current constant-current control module; 6. Switching transistor Q1; 7. First battery overcharge protection unit; 8. Second battery overcharge protection unit; 9. Lithium battery BAT1; 10. Live-neutral detection module; 11. AC detection module; 12. Battery discharging power transistor control module; 13. First battery over-discharge protection unit; 14. Second battery over-discharge protection unit; 15. Lithium battery BAT2; 16. Discharging drive module; 17. Switching transistor Q2; 18. Emergency equipment output terminal. Detailed Embodiments

[0022] The following further describes the present utility model in conjunction with the drawings and specific embodiments as follows:

[0023] As Figure 1As shown, the emergency device power supply management and control circuit based on two series-connected lithium batteries provided by the present utility model includes a charging circuit and a discharging circuit; the charging circuit includes an input undervoltage shutdown control module 1, a charging current sampling module 4, a switching transistor Q1 6, a current constant current control module 5, a battery overcharge protection module, a battery charging power transistor control module 2, and an over-temperature protection module 3; the discharging circuit includes an AC detection module 11, a live-neutral detection module 10, a battery over-discharge protection module, a battery discharging power transistor control module 12, a discharging drive module 16, and a switching transistor Q2 17; the switching transistor Q1 and the switching transistor Q2 are both MOS transistors. It should be noted that: the above-mentioned input undervoltage shutdown control module 1, charging current sampling module 4, switching transistor Q1 6, current constant current control module 5, battery overcharge protection module, battery charging power transistor control module 2, over-temperature protection module 3, AC detection module 11, live-neutral detection module 10, battery over-discharge protection module, battery discharging power transistor control module 12, discharging drive module 16, and switching transistor Q2 17 can all adopt existing modules.

[0024] The input terminals of the input undervoltage shutdown control module 1 and the switching transistor Q1 6 are both connected to the VCC power supply; the output terminal of the switching transistor Q1 6 is electrically connected to the input terminal of the charging current sampling module 4, the input terminal of the battery overcharge protection module, the input terminal of the battery over-discharge protection module, the input terminal of the switching transistor Q2 17, and one of the two series-connected lithium batteries, BAT1 9; the other lithium battery, BAT2 15, of the two series-connected lithium batteries is electrically connected to the input terminal of the battery overcharge protection module, the input terminal of the battery over-discharge protection module, and the output terminal 18 of the emergency device respectively;

[0025] The output terminal of the charging current sampling module 4 is electrically connected to the battery charging power transistor control module 2 through the current constant current control module 5, and the output terminal of the input undervoltage shutdown control module 1, the controlled terminal of the switching transistor Q1 6, and the output terminal of the battery overcharge protection module are respectively electrically connected to the battery charging power transistor control module 2; the over-temperature protection module 3 is electrically connected to the battery charging power transistor control module 2 and is used to detect the ambient temperature of the two series-connected lithium batteries and feedback it to the battery charging power transistor control module when the temperature is too high;

[0026] The input end of the AC detection module 11 is electrically connected to the live wire and neutral wire. The output end of the AC detection module 11 is electrically connected to the battery discharge power transistor control module 12. Specifically, the AC detection module 11 includes an AC level detection unit and an AC resistance detection unit. The input ends of the AC level detection unit and the AC resistance detection unit are respectively electrically connected to the live wire and neutral wire. The output ends of the AC level detection unit and the AC resistance detection unit are respectively electrically connected to the battery discharge power transistor control module. The live wire and neutral wire detection module 10 is electrically connected to the AC detection module 11. The output end of the battery over-discharge protection module and the battery charging power transistor control module are respectively electrically connected to the battery discharge power transistor control module.

[0027] In this embodiment, the battery over-charge protection module includes a first battery over-charge protection unit 7 and a second battery over-charge protection unit 8; the battery over-discharge protection module includes a first battery over-discharge protection unit 13 and a second battery over-discharge protection unit 14; the output end of the switching transistor Q1 6 is respectively electrically connected to the input ends of the first battery over-charge protection unit 7 and the first battery over-discharge protection unit 13; the input ends of the second battery over-charge protection unit 8 and the second battery over-discharge protection unit 14 are respectively electrically connected to the other lithium battery BAT2 15 in the two series-connected lithium batteries.

[0028] The battery discharge power transistor control module 12 is electrically connected to the controlled end of the switching transistor Q2 17 through the discharge drive module 16. The output end of the switching transistor Q2 17 is electrically connected to the emergency device output end 18; the emergency device output end 18 is used to be electrically connected to an emergency device. The emergency device includes one or more of an emergency lighting lamp and an emergency fan. Such as an emergency lighting lamp installed in a parking lot, tunnel, factory building, corridor, office area or public area, a household emergency fan or an emergency air supply system in a corridor public area.

[0029] Specifically, the working principle of the present invention is as follows:

[0030] The entire circuit consists of a charging circuit and a discharging circuit. The charging circuit includes an input under-voltage shutdown control module, a charging current sampling module, a switching transistor Q1, a current constant-current control module, a battery over-charge protection module, a battery charging power transistor control module and an over-temperature protection module; the discharging circuit includes an AC detection module, a live wire and neutral wire detection module, a battery over-discharge protection module, a battery discharge power transistor control module, a discharge drive module and a switching transistor Q2;

[0031] When the VCC power supply is connected, the input undervoltage shutdown control module starts to judge the power supply voltage. When the power supply voltage is higher than the preset threshold voltage, the charging circuit starts to work. At this time, the charging current is sampled, and the sampled battery voltage is compared with the internal reference voltage, and the two lithium batteries are charged simultaneously in a progressive manner through three processes: trickle, constant current, and constant voltage.

[0032] In the discharge circuit, the impedance network of the L and N pins is detected by the AC level detection unit and the AC resistance detection unit in the AC detection module, and then the working state (on or off) of the switching transistor Q2 between the VCC power supply and the output terminal of the emergency device is controlled according to different states of the AC power supply terminal.

[0033] When the AC power supply is normally input, the AC detection module detects a high impedance, then turns off the switching transistor Q2, and the output terminal of the emergency device outputs a low level. When the AC power supply is disconnected, the AC detection module detects that the impedance network of the L and N pins is less than the trigger impedance, turns on the switching transistor Q2, and the output terminal of the emergency device outputs a high level, and the emergency LED lamp beads or the emergency fan connected to the output terminal of the emergency device are driven. When the voltage of the lithium battery is lower than the over-discharge detection voltage, over-discharge protection is triggered, and the emergency LED lamp beads or the emergency fan are turned off.

[0034] The present utility model has been described by the above related embodiments and the accompanying drawings. However, the above embodiments are only examples for implementing the present utility model. It must be pointed out that the disclosed embodiments do not limit the scope of the present utility model. On the contrary, modifications and equivalent arrangements included in the spirit and scope of the claims are included in the scope of the present utility model.

Claims

1. An emergency equipment power supply management and control circuit based on two series-connected lithium batteries, characterized in that, It includes a charging circuit and a discharging circuit; The charging circuit includes an input undervoltage shutdown control module, an overtemperature protection module, a charging current sampling module, a switching transistor Q1, a current constant current control module, a battery overcharge protection module, and a battery charging power transistor control module; the discharging circuit includes an AC detection module, a live-neutral detection module, a battery over-discharge protection module, a battery discharging power transistor control module, a discharging drive module, and a switching transistor Q2; The input terminals of the input undervoltage shutdown control module and the switching transistor Q1 are both connected to the VCC power supply; the output terminal of the switching transistor Q1 is electrically connected to the input terminal of the charging current sampling module, the input terminal of the battery overcharge protection module, the input terminal of the battery over-discharge protection module, the input terminal of the switching transistor Q2, and one of the two series-connected lithium batteries, BAT1; the other lithium battery, BAT2, of the two series-connected lithium batteries is electrically connected to the input terminals of the battery overcharge protection module and the battery over-discharge protection module respectively; The output terminal of the charging current sampling module is electrically connected to the battery charging power transistor control module through the current constant current control module, and the output terminals of the input undervoltage shutdown control module, the controlled terminal of the switching transistor Q1, and the battery overcharge protection module are respectively electrically connected to the battery charging power transistor control module; the overtemperature protection module is electrically connected to the battery charging power transistor control module and is used to detect the ambient temperature of the two series-connected lithium batteries and feedback to the battery charging power transistor control module when the temperature is too high; The input terminal of the AC detection module is connected to the live and neutral wires, the output terminal of the AC detection module is respectively electrically connected to the live-neutral detection module and the battery discharging power transistor control module, the output terminals of the battery over-discharge protection module and the battery charging power transistor control module are respectively electrically connected to the battery discharging power transistor control module, the battery discharging power transistor control module is electrically connected to the controlled terminal of the switching transistor Q2 through the discharging drive module, and the output terminal of the switching transistor Q2 is connected to the emergency device output terminal; The emergency device output terminal is used to be connected to an emergency device.

2. The emergency device power supply management and control circuit based on two series-connected lithium batteries according to claim 1, wherein The AC detection module includes an AC level detection unit and an AC resistance detection unit. The input terminals of the AC level detection unit and the AC resistance detection unit are respectively connected to the live and neutral wires, and the output terminals of the AC level detection unit and the AC resistance detection unit are respectively electrically connected to the battery discharging power transistor control module.

3. The emergency equipment power supply management and control circuit based on two series-connected lithium batteries according to claim 1, characterized in that, The battery overcharge protection module includes a first battery overcharge protection unit and a second battery overcharge protection unit; the battery over-discharge protection module includes a first battery over-discharge protection unit and a second battery over-discharge protection unit; The output terminal of the switching transistor Q1 is electrically connected to the input terminals of the first battery overcharge protection unit and the first battery over-discharge protection unit respectively; The input terminals of the second battery overcharge protection unit and the second battery over-discharge protection unit are respectively electrically connected to the other lithium battery, BAT2, of the two series-connected lithium batteries.

4. The emergency equipment power supply management and control circuit based on two series-connected lithium batteries according to claim 1, characterized in that, The emergency device includes one or more of an emergency lighting lamp and an emergency fan.

5. The emergency device power supply management and control circuit based on two series-connected lithium batteries according to claim 1, wherein Both the switching transistor Q1 and the switching transistor Q2 are MOS transistors.

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