Management control circuit for prolonging lithium battery emergency lighting discharge time
By adopting the electrical connection design of components such as lithium battery BAT, battery over-discharge protection unit, PWM duty cycle comparator, etc. in the emergency lighting management and control circuit, the discharge output is automatically adjusted, which solves the problem that the emergency lighting duration depends on the battery capacity, and realizes the extension of lighting time and cost savings.
Patent Information
- Application Number
- CN202422642194.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-10-30
AI Technical Summary
In existing emergency lighting management and control circuits, the emergency lighting duration depends on the battery capacity, which increases battery costs.
The electrical connection design adopts the lithium battery BAT, battery over-discharge protection unit, PWM duty cycle comparator, battery discharge power tube control module, PWM duty cycle controller and emergency output control switch tube Q2. By adjusting the PWM duty cycle to extend the lighting time, and combining with the AC detection module, over-temperature protection module, etc., it can realize automatic adjustment of discharge output.
Under the same battery capacity and initial luminous flux requirements, the lighting time is extended by 20%-40%, while the battery capacity requirement is reduced by 60%-80%, effectively saving costs.
Smart Images
Figure CN223414618U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of emergency lighting, in particular to a management control circuit for extending the discharge time of lithium-ion emergency lighting. Background Art
[0002] Currently, emergency lighting management and control circuits on the market primarily utilize integrated circuits for single-cell or multi-cell lithium battery charge and discharge management. Discharge management primarily employs three methods: 1. Using an internal MOSFET for direct-switch control; 2. Using three-level PWM duty cycle dimming control (100%, 50%, and 20%); and 3. Using three-level linear constant current control (100%, 50%, and 20%).
[0003] With the first solution, the emergency lighting duration depends entirely on the battery capacity and the operating current set to achieve the initial luminous flux requirement. A larger battery capacity results in a longer duration, while a lower current results in a longer duration. The second and third solutions both build on the first solution by manually adjusting the emergency lighting luminous flux through the power switch, reducing the current and extending the emergency lighting duration.
[0004] However, assuming the same initial luminous flux requirements, the emergency lighting duration of the three solutions mentioned above all depends on the battery capacity, which significantly increases the proportion of battery costs in emergency lighting solutions. Utility Model Content
[0005] In view of this, the purpose of the present invention is to provide a management and control circuit for extending the discharge time of lithium-ion emergency lighting, so as to solve the above technical problems.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0007] A management and control circuit for extending the discharge time of lithium-ion emergency lighting, including a lithium battery BAT, a battery over-discharge protection unit, a PWM duty cycle comparator, a battery discharge power tube control module, a PWM duty cycle controller, and an emergency output control switch tube Q2;
[0008] The lithium battery BAT is electrically connected to the input end of the battery over-discharge protection unit, the positive input end of the PWM duty cycle comparator, and the power supply end of the emergency output control switch tube Q2, respectively. The output end of the battery over-discharge protection unit is electrically connected to the battery discharge power tube control module. The output ends of the battery discharge power tube control module and the PWM duty cycle comparator are electrically connected to the input end of the PWM duty cycle controller, respectively. The output end of the PWM duty cycle controller is electrically connected to the input end of the emergency output control switch tube Q2, and the output end of the emergency output control switch tube Q2 is electrically connected to an external emergency lighting lamp.
[0009] Furthermore, the inverting input terminal of the PWM duty cycle comparator is connected to the triangular wave signal output by the triangular wave generator, and the positive input terminal of the PWM duty cycle comparator is connected to the positive electrode of the lithium battery BAT.
[0010] Furthermore, it also includes an AC detection module, the input end of the AC detection module is electrically connected to the live wire and the neutral wire respectively, and the output end of the AC detection module is electrically connected to the battery discharge power tube control module.
[0011] Furthermore, it also includes a battery charging power tube control module, an input undervoltage shutdown control module, a charging current sampling module, a battery overcharge protection unit and a charging control switch tube Q1;
[0012] The input end of the input undervoltage shutdown control module and the power supply end of the charging control switch tube Q1 are respectively electrically connected to the power supply VCC; the output end of the input undervoltage shutdown control module, the input end of the charging control switch tube Q1, the output end of the charging current sampling module and the output end of the battery overcharge protection unit are respectively electrically connected to the battery charging power tube control module; the output end of the charging control switch tube Q1 is respectively electrically connected to the input end of the charging current sampling module and the input end of the battery overcharge protection unit.
[0013] Furthermore, it also includes an over-temperature protection module; the over-temperature protection module is electrically connected to the battery charging power tube control module, and the over-temperature protection module is used to detect the ambient temperature of the lithium battery and feed back to the battery charging power tube control module when the temperature is over.
[0014] A management and control circuit for extending the discharge time of lithium-ion emergency lighting, including a lithium battery BAT, a battery over-discharge protection unit, a battery discharge power tube control module, a timer, a PWM duty cycle controller, and an emergency output control switch tube Q2;
[0015] The lithium battery BAT is electrically connected to the input end of the battery over-discharge protection unit, the positive input end of the PWM duty cycle comparator, and the power supply end of the emergency output control switch tube Q2, respectively. The output end of the battery over-discharge protection unit is electrically connected to the battery discharge power tube control module, and the battery discharge power tube control module is electrically connected to the input end of the PWM duty cycle controller through a timer; the output end of the PWM duty cycle controller is electrically connected to the input end of the emergency output control switch tube Q2, and the output end of the emergency output control switch tube Q2 is electrically connected to an external emergency lighting lamp.
[0016] Furthermore, an AC detection module is included, wherein the input end of the AC detection module is electrically connected to the live wire and the neutral wire respectively, and the output end of the AC detection module is electrically connected to the battery discharge power tube control module.
[0017] Furthermore, it also includes a battery charging power tube control module, an input undervoltage shutdown control module, a charging current sampling module, a battery overcharge protection unit and a charging control switch tube Q1;
[0018] The input end of the input undervoltage shutdown control module and the power supply end of the charging control switch tube Q1 are respectively electrically connected to the power supply VCC; the output end of the input undervoltage shutdown control module, the input end of the charging control switch tube Q1, the output end of the charging current sampling module and the output end of the battery overcharge protection unit are respectively electrically connected to the battery charging power tube control module; the output end of the charging control switch tube Q1 is respectively electrically connected to the input end of the charging current sampling module and the input end of the battery overcharge protection unit.
[0019] Furthermore, it also includes an over-temperature protection module; the over-temperature protection module is electrically connected to the battery charging power tube control module, and the over-temperature protection module is used to detect the ambient temperature of the lithium battery and feed back to the battery charging power tube control module when the temperature is over.
[0020] The beneficial effects of the utility model are:
[0021] The utility model provides a management and control circuit for extending the discharge time of lithium-ion battery emergency lighting. The circuit includes a lithium battery (BAT), a battery over-discharge protection unit, a PWM duty cycle comparator, a battery discharge power control module, a PWM duty cycle controller, and an emergency output control switch Q2. The circuit is electrically connected to the following: the lithium battery (BAT) is electrically connected to the input of the battery over-discharge protection unit, the positive input of the PWM duty cycle comparator, and the power supply of the emergency output control switch Q2; the output of the battery over-discharge protection unit is electrically connected to the battery discharge power control module; the outputs of the battery discharge power control module and the PWM duty cycle comparator are electrically connected to the input of the PWM duty cycle controller; the output of the PWM duty cycle controller is electrically connected to the input of the emergency output control switch Q2; and the output of the emergency output control switch Q2 is electrically connected to an external emergency lighting fixture. Through this circuit design, 1. Under the same battery capacity and initial luminous flux requirements, the lighting time can be extended by 20%-40%, effectively extending the lighting time. 2. Under the same lighting time requirements and initial luminous flux requirements, only batteries with 60%-80% capacity specifications need to be used, which effectively saves costs.
[0022] The utility model provides a management and control circuit for extending the discharge time of lithium-ion emergency lighting, which uses a timer to replace the above-mentioned PWM duty cycle comparator and can also achieve the above-mentioned technical effects. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1Shown is a circuit schematic diagram of a management control circuit for extending the discharge time of lithium battery emergency lighting according to the present invention;
[0024] Figure 2 Shown is a circuit schematic diagram of a management control circuit for extending the discharge time of lithium battery emergency lighting according to the present invention;
[0025] Description of Figure Numbers:
[0026] BAT-lithium battery; VCC-power supply;
[0027] A1-overtemperature protection module; A2-input undervoltage shutdown control module; A3-charging current sampling module; A4-battery overcharge protection unit; A5-battery overdischarge protection unit; A6-PWM duty cycle comparator;
[0028] B1-battery charging power tube control module; B2-AC detection module; B3-battery discharging power tube control module; B4-PWM duty cycle controller; B5-timer;
[0029] Q1-charging control switch tube; Q2-emergency output control switch tube. DETAILED DESCRIPTION
[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0031] like Figure 1-Figure 2 As shown, the present invention provides a management and control circuit for extending the discharge time of lithium battery emergency lighting, including a lithium battery BAT, a battery over-discharge protection unit, a PWM duty cycle comparator, a battery discharge power tube control module, a PWM duty cycle controller and an emergency output control switch tube Q2;
[0032] The lithium battery BAT is electrically connected to the input end of the battery over-discharge protection unit, the positive input end of the PWM duty cycle comparator, and the power supply end of the emergency output control switch tube Q2, respectively. The output end of the battery over-discharge protection unit is electrically connected to the battery discharge power tube control module. The output ends of the battery discharge power tube control module and the PWM duty cycle comparator are electrically connected to the input end of the PWM duty cycle controller, respectively. The output end of the PWM duty cycle controller is electrically connected to the input end of the emergency output control switch tube Q2, and the output end of the emergency output control switch tube Q2 is electrically connected to an external emergency lighting lamp.
[0033] From the above description, it can be seen that the beneficial effects of the present invention are:
[0034] The utility model provides a management and control circuit for extending the discharge time of lithium-ion battery emergency lighting. The circuit includes a lithium battery (BAT), a battery over-discharge protection unit, a PWM duty cycle comparator, a battery discharge power control module, a PWM duty cycle controller, and an emergency output control switch Q2. The circuit is electrically connected to the following: the lithium battery (BAT) is electrically connected to the input of the battery over-discharge protection unit, the positive input of the PWM duty cycle comparator, and the power supply of the emergency output control switch Q2; the output of the battery over-discharge protection unit is electrically connected to the battery discharge power control module; the outputs of the battery discharge power control module and the PWM duty cycle comparator are electrically connected to the input of the PWM duty cycle controller; the output of the PWM duty cycle controller is electrically connected to the input of the emergency output control switch Q2; and the output of the emergency output control switch Q2 is electrically connected to an external emergency lighting fixture. This circuit design effectively extends the lighting time by 20%-40% under the same battery capacity and initial luminous flux requirements. Under the same lighting time requirements and initial luminous flux requirements, only batteries with 60%-80% capacity specifications need to be used, effectively saving costs.
[0035] Furthermore, the inverting input terminal of the PWM duty cycle comparator is connected to the triangular wave signal output by the triangular wave generator, and the positive input terminal of the PWM duty cycle comparator is connected to the positive electrode of the lithium battery BAT.
[0036] From the above description, it can be seen that through the above connection method, a variable duty cycle PWM control signal can be generated. This control signal drives the emergency output control switch tube Q2, so that the discharge output automatically changes the duty cycle of the PWM output according to the battery voltage condition, thereby extending the lighting time under the same battery capacity and initial luminous flux requirements.
[0037] Furthermore, an AC detection module is included, wherein the input end of the AC detection module is electrically connected to the live wire and the neutral wire respectively, and the output end of the AC detection module is electrically connected to the battery discharge power tube control module.
[0038] From the above description, it can be seen that the emergency equipment is driven by judging the state of the AC power supply and controlling the switching state of the internal switch tube Q2.
[0039] Furthermore, it also includes a battery charging power tube control module, an input undervoltage shutdown control module, a charging current sampling module, a battery overcharge protection unit and a charging control switch tube Q1;
[0040] The input end of the input undervoltage shutdown control module and the power supply end of the charging control switch tube Q1 are respectively electrically connected to the power supply VCC; the output end of the input undervoltage shutdown control module, the input end of the charging control switch tube Q1, the output end of the charging current sampling module and the output end of the battery overcharge protection unit are respectively electrically connected to the battery charging power tube control module; the output end of the charging control switch tube Q1 is respectively electrically connected to the input end of the charging current sampling module and the input end of the battery overcharge protection unit.
[0041] As can be seen from the above description, overcharging of the lithium battery is prevented, thereby protecting the lithium battery from damage or shortening of the life of the power supply system caused by overcharging.
[0042] Furthermore, it also includes an over-temperature protection module; the over-temperature protection module is electrically connected to the battery charging power tube control module, and the over-temperature protection module is used to detect the ambient temperature of the lithium battery and feed back to the battery charging power tube control module when the temperature is over.
[0043] From the above description, it can be seen that the over-temperature protection module is used to detect the ambient temperature of the lithium battery and feed back to the battery charging power tube control module when the temperature is over, thereby effectively preventing the performance and safety of the lithium battery from being affected by the high temperature of the lithium battery.
[0044] A management and control circuit for extending the discharge time of lithium-ion emergency lighting, including a lithium battery BAT, a battery over-discharge protection unit, a battery discharge power tube control module, a timer, a PWM duty cycle controller, and an emergency output control switch tube Q2;
[0045] The lithium battery BAT is electrically connected to the input end of the battery over-discharge protection unit, the positive input end of the PWM duty cycle comparator, and the power supply end of the emergency output control switch tube Q2, respectively. The output end of the battery over-discharge protection unit is electrically connected to the battery discharge power tube control module, and the battery discharge power tube control module is electrically connected to the input end of the PWM duty cycle controller through a timer; the output end of the PWM duty cycle controller is electrically connected to the input end of the emergency output control switch tube Q2, and the output end of the emergency output control switch tube Q2 is electrically connected to an external emergency lighting lamp.
[0046] As can be seen from the above description, the beneficial effect of the present invention is that a timer is used instead of the above-mentioned PWM duty cycle comparator to achieve the above-mentioned technical effect. Specifically, by adding a timer, when a power grid power outage emergency state is detected, the discharge enable is turned on (entering the emergency state), the timer starts operating, and the PWM duty cycle control sets the PWM signal duty cycle according to the timer register state, driving the emergency output control switch Q2, so that the discharge output automatically adjusts the PWM output duty cycle according to the discharge operating time, thereby extending the lighting time under the same battery capacity and initial luminous flux requirements.
[0047] Furthermore, an AC detection module is included, wherein the input end of the AC detection module is electrically connected to the live wire and the neutral wire respectively, and the output end of the AC detection module is electrically connected to the battery discharge power tube control module.
[0048] From the above description, it can be seen that the emergency equipment is driven by judging the state of the AC power supply and controlling the switching state of the internal switch tube Q2.
[0049] Furthermore, it also includes a battery charging power tube control module, an input undervoltage shutdown control module, a charging current sampling module, a battery overcharge protection unit and a charging control switch tube Q1;
[0050] The input end of the input undervoltage shutdown control module and the power supply end of the charging control switch tube Q1 are respectively electrically connected to the power supply VCC; the output end of the input undervoltage shutdown control module, the input end of the charging control switch tube Q1, the output end of the charging current sampling module and the output end of the battery overcharge protection unit are respectively electrically connected to the battery charging power tube control module; the output end of the charging control switch tube Q1 is respectively electrically connected to the input end of the charging current sampling module and the input end of the battery overcharge protection unit.
[0051] As can be seen from the above description, overcharging of the lithium battery is prevented, thereby protecting the lithium battery from damage or shortening of the life of the power supply system caused by overcharging.
[0052] Furthermore, it also includes an over-temperature protection module; the over-temperature protection module is electrically connected to the battery charging power tube control module, and the over-temperature protection module is used to detect the ambient temperature of the lithium battery and feed back to the battery charging power tube control module when the temperature is over.
[0053] From the above description, it can be seen that the over-temperature protection module is used to detect the ambient temperature of the lithium battery and feed back to the battery charging power tube control module when the temperature is over, thereby effectively preventing the performance and safety of the lithium battery from being affected by the high temperature of the lithium battery.
[0054] Several preferred embodiments or application examples are listed below to help those skilled in the art better understand the technical content of the present invention and the technical contribution made by the present invention relative to the prior art:
[0055] Preferred embodiment one:
[0056] like Figure 1 As shown, the present invention provides a management and control circuit for extending the discharge time of lithium-ion emergency lighting, including a lithium battery BAT, a battery over-discharge protection unit A5, a PWM duty cycle comparator A6, a battery discharge power tube control module B3, a PWM duty cycle controller B4, an emergency output control switch tube Q2, an AC detection module B2, a battery charging power tube control module B1, an input undervoltage shutdown control module A2, a charging current sampling module A3, a battery overcharge protection unit A4, a charging control switch tube Q1, and an over-temperature protection module A1;
[0057] The lithium battery BAT is respectively electrically connected to the input end of the battery over-discharge protection unit A5, the positive input end of the PWM duty cycle comparator A6, and the power supply end of the emergency output control switch tube Q2. The output end of the battery over-discharge protection unit A5 is electrically connected to the battery discharge power tube control module B3. The output ends of the battery discharge power tube control module B3 and the PWM duty cycle comparator A6 are respectively electrically connected to the input end of the PWM duty cycle controller B4. The output end of the PWM duty cycle controller B4 is electrically connected to the input end of the emergency output control switch tube Q2. The output end of the emergency output control switch tube Q2 is electrically connected to an external emergency lighting lamp.
[0058] The inverting input terminal of the PWM duty cycle comparator A6 is connected to the triangular wave signal output by the triangular wave generator, and the positive input terminal of the PWM duty cycle comparator A6 is connected to the positive electrode of the lithium battery BAT, generating a variable duty cycle PWM control signal that changes with the battery voltage. This control signal drives the emergency output control switch tube Q2, so that the discharge output automatically changes the duty cycle of the PWM output according to the battery voltage condition, thereby extending the lighting time under the conditions of the same battery capacity and initial luminous flux requirements.
[0059] The PWM output control method automatically adjusts the PWM duty cycle based on the battery voltage. High battery voltage increases the PWM duty cycle, while low battery voltage decreases the PWM duty cycle. Setting upper and lower battery voltage reference limits corresponds to the maximum and minimum PWM output duty cycle values. When the battery voltage falls below the upper reference limit, the duty cycle begins to decrease. When the battery voltage falls below the lower reference limit, the duty cycle stops decreasing.
[0060] The input end of the AC detection module B2 is electrically connected to the live wire and neutral wire respectively, and the output end of the AC detection module B2 is electrically connected to the battery discharge power tube control module B3. By determining the AC power supply status, the on / off state of the internal switch tube Q2 is controlled to drive the emergency device.
[0061] The input end of the input undervoltage shutdown control module A2 and the power supply end of the charging control switch tube Q1 are respectively electrically connected to the power supply VCC; the output end of the input undervoltage shutdown control module A2, the input end of the charging control switch tube Q1, the output end of the charging current sampling module A3, and the output end of the battery overcharge protection unit A4 are respectively electrically connected to the battery charging power tube control module B1; and the output end of the charging control switch tube Q1 is respectively electrically connected to the input end of the charging current sampling module A3 and the input end of the battery overcharge protection unit A4. This method can prevent overcharging of the lithium battery, thereby protecting the lithium battery from damage to the power supply system or shortening of its life due to overcharging.
[0062] The over-temperature protection module A1 is electrically connected to the battery charging power tube control module B1, and the over-temperature protection module A1 is used to detect the ambient temperature of the lithium battery and feedback to the battery charging power tube control module when the temperature is over, thereby effectively avoiding the performance and safety of the lithium battery being affected by the high temperature of the lithium battery.
[0063] Preferred embodiment 2:
[0064] like Figure 2 As shown, based on the above-mentioned embodiment 1, this embodiment 2 adopts a timer, and the battery discharge power tube control module is electrically connected to the input end of the PWM duty cycle controller through the timer to replace the technical feature of the embodiment 1 in which the triangular wave signal is connected to the reverse input end of the PWM duty cycle comparator.
[0065] By adding a timer, when a power outage emergency state is detected, the discharge enable is turned on (entering the emergency state), the timer starts working, and the PWM duty cycle control sets the PWM signal duty cycle according to the timer register state, driving the emergency output control switch tube Q2, so that the discharge output automatically adjusts the PWM output duty cycle according to the discharge working time, thereby extending the lighting time under the same battery capacity and initial luminous flux requirements.
[0066] The PWM output control method is used to automatically adjust the PWM duty cycle according to the emergency lighting startup time. Every once in a while (for example, 30 minutes), the PWM duty cycle is automatically adjusted and reduced.
[0067] Specifically, the working principle of the present utility model is as follows:
[0068] The entire circuit includes a lithium battery BAT, a battery over-discharge protection unit A5, a battery discharge power tube control module B3, a PWM duty cycle controller B4, an emergency output control switch tube Q2, an AC detection module B2, a battery charging power tube control module B1, an input undervoltage shutdown control module A2, a charging current sampling module A3, a battery overcharge protection unit A4, a charging control switch tube Q1, an over-temperature protection module A1 and a timer B5; the specific connection method is as follows Figure 2 shown.
[0069] When the power supply VCC 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. The lithium battery is charged progressively in three processes: trickle current, constant current, and constant voltage.
[0070] During discharge, the AC level detection unit and AC resistance detection unit in the AC detection module are used to detect the L and N pin impedance networks, and then the working state (open or closed) of the emergency output control switch tube Q2 between the power supply VCC and the output end of the emergency device is controlled according to the different states of the AC power end.
[0071] When the AC power is normally input, the AC detection module detects high impedance and turns off the emergency output control switch Q2, causing the emergency device output to output at a low level. When the AC power is disconnected, the AC detection module detects that the impedance network between the L and N pins is less than the trigger impedance and turns on the emergency output control switch Q2, causing the emergency device output to output at a high level, activating the emergency LED connected to the emergency device output. When the lithium battery voltage falls below the over-discharge detection voltage, over-discharge protection is triggered, turning off the emergency LED.
[0072] In summary, by connecting a triangular wave signal to the inverting input of the PWM duty cycle comparator and comparing it with the positive voltage of the lithium battery BAT, a variable duty cycle PWM control signal is generated. This control signal drives the emergency output control switch tube Q2, so that the discharge output automatically adjusts the duty cycle of the PWM output according to the battery voltage condition, thereby extending the lighting time under the same battery capacity and initial luminous flux requirements. Alternatively, by adding a timer, when a grid power outage emergency state is detected, the discharge enable is turned on (entering the emergency state), the timer starts working, and the PWM duty cycle control sets the PWM signal duty cycle according to the timer register state, driving the emergency output control switch tube Q2, so that the discharge output automatically adjusts the PWM output duty cycle according to the discharge working time, thereby extending the lighting time under the same battery capacity and initial luminous flux requirements.
[0073] The present invention has been described with reference to the above embodiments and accompanying drawings. However, the above embodiments are merely exemplary embodiments of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and equivalents falling within the spirit and scope of the claims are intended to be within the scope of the present invention.
Claims
1. A management and control circuit for extending the discharge time of lithium battery emergency lighting, characterized in that: Including lithium battery BAT, battery over-discharge protection unit, PWM duty cycle comparator, battery discharge power tube control module, PWM duty cycle controller and emergency output control switch tube Q2; The lithium battery BAT is electrically connected to the input end of the battery over-discharge protection unit, the positive input end of the PWM duty cycle comparator, and the power supply end of the emergency output control switch tube Q2, respectively. The output end of the battery over-discharge protection unit is electrically connected to the battery discharge power tube control module. The output ends of the battery discharge power tube control module and the PWM duty cycle comparator are electrically connected to the input end of the PWM duty cycle controller, respectively. The output end of the PWM duty cycle controller is electrically connected to the input end of the emergency output control switch tube Q2, and the output end of the emergency output control switch tube Q2 is electrically connected to an external emergency lighting lamp.
2. The management and control circuit for extending the discharge time of lithium battery emergency lighting according to claim 1 is characterized in that: The inverting input terminal of the PWM duty cycle comparator is connected to the triangular wave signal output by the triangular wave generator, and the positive input terminal of the PWM duty cycle comparator is connected to the positive electrode of the lithium battery BAT.
3. The management and control circuit for extending the discharge time of lithium battery emergency lighting according to claim 1 is characterized in that: It also includes an AC detection module, the input end of the AC detection module is electrically connected to the live wire and the neutral wire respectively, and the output end of the AC detection module is electrically connected to the battery discharge power tube control module.
4. The management and control circuit for extending the discharge time of lithium battery emergency lighting according to claim 1 is characterized in that: It also includes a battery charging power tube control module, an input undervoltage shutdown control module, a charging current sampling module, a battery overcharge protection unit and a charging control switch tube Q1; The input end of the input undervoltage shutdown control module and the power supply end of the charging control switch tube Q1 are respectively electrically connected to the power supply VCC; the output end of the input undervoltage shutdown control module, the input end of the charging control switch tube Q1, the output end of the charging current sampling module and the output end of the battery overcharge protection unit are respectively electrically connected to the battery charging power tube control module; the output end of the charging control switch tube Q1 is respectively electrically connected to the input end of the charging current sampling module and the input end of the battery overcharge protection unit.
5. The management and control circuit for extending the discharge time of lithium battery emergency lighting according to claim 4 is characterized in that: It also includes an over-temperature protection module; the over-temperature protection module is electrically connected to the battery charging power tube control module, and the over-temperature protection module is used to detect the ambient temperature of the lithium battery and feedback to the battery charging power tube control module when the temperature is over.
6. A management and control circuit for extending the discharge time of lithium battery emergency lighting, characterized in that: Including lithium battery BAT, battery over-discharge protection unit, battery discharge power tube control module, timer, PWM duty cycle controller and emergency output control switch tube Q2; The lithium battery BAT is electrically connected to the input end of the battery over-discharge protection unit, the positive input end of the PWM duty cycle comparator, and the power supply end of the emergency output control switch tube Q2, respectively. The output end of the battery over-discharge protection unit is electrically connected to the battery discharge power tube control module, and the battery discharge power tube control module is electrically connected to the input end of the PWM duty cycle controller through a timer; the output end of the PWM duty cycle controller is electrically connected to the input end of the emergency output control switch tube Q2, and the output end of the emergency output control switch tube Q2 is electrically connected to an external emergency lighting lamp.
7. The management and control circuit for extending the discharge time of lithium battery emergency lighting according to claim 6, characterized in that: It also includes an AC detection module, the input end of the AC detection module is electrically connected to the live wire and the neutral wire respectively, and the output end of the AC detection module is electrically connected to the battery discharge power tube control module.
8. The management and control circuit for extending the discharge time of lithium battery emergency lighting according to claim 6, characterized in that: It also includes a battery charging power tube control module, an input undervoltage shutdown control module, a charging current sampling module, a battery overcharge protection unit and a charging control switch tube Q1; The input end of the input undervoltage shutdown control module and the power supply end of the charging control switch tube Q1 are respectively electrically connected to the power supply VCC; the output end of the input undervoltage shutdown control module, the input end of the charging control switch tube Q1, the output end of the charging current sampling module and the output end of the battery overcharge protection unit are respectively electrically connected to the battery charging power tube control module; the output end of the charging control switch tube Q1 is respectively electrically connected to the input end of the charging current sampling module and the input end of the battery overcharge protection unit.
9. The management and control circuit for extending the discharge time of lithium battery emergency lighting according to claim 8, characterized in that: It also includes an over-temperature protection module; the over-temperature protection module is electrically connected to the battery charging power tube control module, and the over-temperature protection module is used to detect the ambient temperature of the lithium battery and feedback to the battery charging power tube control module when the temperature is over.