Emergency lighting system

Abstract

The utility model relates to the field of emergency lighting, and discloses an emergency lighting system which comprises a battery pack, a lighting load, an emergency drive and a plug-in assembly used for connecting the battery pack and the emergency drive, and the emergency drive comprises an AC-DC converter, a battery discharging circuit and a battery charging management module. The device is characterized in that the plug-in assembly comprises a first plug-in piece on the battery pack side and a second plug-in piece on the emergency driving side, a first contact of the first plug-in piece is connected with the positive electrode of the battery pack, a second contact of the first plug-in piece is connected with the negative electrode of the battery pack, and a third contact of the first plug-in piece is connected with the first contact or the second contact through a temperature sensor; when the plugging assembly is connected, the voltage of the third contact on the second plugging piece changes along with the change of the temperature of the battery pack; and when the plugging assembly is disconnected, the voltage of the third contact on the second plugging piece is the disconnection voltage beyond the temperature control voltage range. The emergency lighting device has a temperature monitoring function and can provide a prompt basis for whether the battery pack is successfully connected or not.

Description

Technical Field

[0001] The utility model relates to the field of emergency lighting, in particular to an emergency lighting system. Background Art

[0002] Currently, most of the batteries used in the market are lithium batteries. Lithium batteries have relatively high requirements for environmental temperature. Coupled with the fact that lithium batteries are relatively active themselves, there are relatively large potential safety hazards.

[0003] Conventionally, a temperature sensor is arranged outside the battery pack to detect the temperature change of the battery during operation. However, it cannot represent the actual ambient temperature of the battery cells inside the battery pack.

[0004] Moreover, in the prior art, the conventional function of the temperature sensor is to detect temperature signals, and its function is single.

[0005] The disclosure of the above background art content is only used to assist in understanding the concept and technical solution of the present application. It does not necessarily belong to the prior art of the present application, nor will it necessarily give technical guidance; in the case where there is no clear evidence indicating that the above content was publicly available before the filing date of the present application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an improved emergency lighting system that can monitor the temperature of the battery pack and at the same time feedback the status information of whether the battery pack is successfully connected.

[0007] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] An emergency lighting system includes a battery pack, a lighting load, an emergency driver, and a plug-in component for connecting the battery pack and the emergency driver. The emergency driver includes an AC-DC converter, a battery discharge circuit, and a battery charging management module; the plug-in component includes a first plug on the battery pack side and a second plug on the emergency driver side, both of which are provided with at least three electrical connection contacts. Among them, the first contact of the first plug is connected to the positive pole of the battery pack, the second contact is connected to the negative pole of the battery pack, and the third contact is connected to the first contact or the second contact through a temperature sensor or an equivalent temperature sensing circuit;

[0009] When the plug-in component is connected, the voltage of the contact on the second plug corresponding to the third contact changes with the change of the battery pack temperature; when the plug-in component is disconnected, the voltage of the contact on the second plug corresponding to the third contact is an open circuit voltage outside the temperature control voltage range.

[0010] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the second plug-in member is connected to the battery charging management module, and the emergency lighting system further includes an indicator light electrically connected to the battery charging management module;

[0011] When the plug-in assembly is disconnected, the battery charging management module controls the indicator light to give a prompt operation indicating that the battery pack is not connected.

[0012] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the battery charging management module includes a temperature control module, and the temperature control module is connected to the contact on the second plug-in member corresponding to the third contact.

[0013] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the temperature control module is a microprocessor, which is configured with a first IO port. The first IO port is connected to the contact on the second plug-in member corresponding to the third contact, and the voltage of the contact is detected through the first IO port.

[0014] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the battery charging management module further includes a BMS module, which is respectively connected to the contacts on the second plug-in member corresponding to the first contact and the second contact through controllable switches;

[0015] The microprocessor is further configured with a second IO port, which is connected to the control end of the BMS module.

[0016] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the microprocessor is further configured with a third IO port, which is connected to the indicator light.

[0017] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the temperature control module is a logic gate circuit containing a comparator.

[0018] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the temperature sensor or an equivalent temperature sensing circuit is an NTC temperature sensor, which is arranged inside the battery compartment of the battery pack or in a neighboring area outside the battery compartment.

[0019] Further, based on any one of the foregoing technical solutions or a combination of multiple technical solutions, the battery pack is further provided with a battery protection circuit, which is connected in parallel across the positive and negative electrodes of the battery cells of the battery pack.

[0020] Further, based on any one of the above-described technical solutions or a combination of multiple technical solutions, the battery discharge circuit includes an emergency conversion module and a DC-DC converter. The emergency conversion module includes a first sampling circuit and a conversion switch. The first sampling circuit is configured to sample the output signal of the AC-DC converter, and the emergency conversion module controls the opening and closing actions of the conversion switch according to the sampling result.

[0021] The beneficial effects brought by the technical solutions provided by the present utility model are as follows:

[0022] a. The temperature sensor is arranged inside or on the outer wall of the battery pack, and the signal of the temperature sensor is led out through the third signal line to realize the monitoring of the ambient temperature inside the battery pack;

[0023] b. In addition to the function of temperature monitoring, the third signal line can also be used to judge whether the battery pack is electrically connected successfully. When the battery pack is not plugged into the BMS module successfully, the indicator light connected to the MCU is used to indicate the current unconnected state of the battery pack. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Schematic diagram of the circuit structure of the emergency lighting drive provided for an exemplary embodiment of the present utility model;

[0026] Figure 2 Schematic diagram of the structure of the battery pack having three output lines provided for an exemplary embodiment of the present utility model. Detailed Embodiments

[0027] In order to enable those skilled in the art to better understand the solutions of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] It should be noted that in the description and claims of the present utility model and the above-mentioned drawings, the terms "first", "second", etc. are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product or equipment comprising a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or equipment.

[0029] In an embodiment of the present utility model, an emergency lighting system is provided, as Figure 1 shown, which includes a battery pack, a lighting load, an emergency driver, and a plug-in component for connecting the battery pack and the emergency driver. The emergency driver includes an AC-DC converter, a battery discharge circuit, and a battery charging management module. It is characterized in that the plug-in component includes a first plug on the battery pack side and a second plug on the emergency driver side, both of which are provided with at least three electrical connection contacts. Among them, the first contact of the first plug is connected to the positive electrode of the battery pack, the second contact is connected to the negative electrode of the battery pack, and the third contact is connected to the second contact through a temperature sensor or an equivalent temperature sensing circuit. In another embodiment, the third contact of the first plug is connected to the first contact through the temperature sensor or the equivalent temperature sensing circuit (not shown).

[0030] There are also three electrical connection contact points on the second plug. Specifically, when the first plug and the second plug are plugged in, the first contact of the second plug is connected to the first contact of the first plug, the second contact of the second plug is connected to the second contact of the first plug, and the third contact of the second plug is connected to the third contact of the first plug.

[0031] When the plug-in component is connected, the voltage of the third contact on the second plug changes with the change of the battery pack temperature; when the plug-in component is disconnected, the voltage of the third contact on the second plug is an open-circuit voltage outside the temperature control voltage range.

[0032] The second plug is connected to the battery charging management module, and the emergency lighting system further includes an indicator light 300 electrically connected to the battery charging management module;

[0033] The battery charging management module is configured to detect the voltage of the contact corresponding to the third contact on the second plug-in member. If an open circuit voltage is detected, the battery charging management module controls the indicator light to perform a prompt operation indicating that the battery pack is not connected.

[0034] The battery discharge circuit includes an emergency conversion module and a DC-DC converter. The DC-DC converter is configured to be connected to a lighting load; the AC-DC converter is configured to be connected to an external AC power supply;

[0035] The emergency conversion module includes a first sampling circuit and a conversion switch. The first sampling circuit is configured to sample the output signal of the AC-DC converter, and the emergency conversion module controls the opening and closing actions of the conversion switch according to the sampling result.

[0036] The temperature sensor or an equivalent temperature sensing circuit can be the NTC temperature sensor 120. It can be arranged in a single chamber with the battery cells of the battery pack, or can be arranged outside the chamber near the battery pack, such as on the outer wall of the battery pack chamber.

[0037] The battery charging management module for emergency driving includes a BMS module and a microprocessor (MCU). The pull-up resistor of the microprocessor and the NTC temperature sensor 120 form a voltage dividing network. As Figure 1 shown, the indicator light 300 is electrically connected to the microprocessor. The microprocessor controls the indicator light 300 to light up, go out or blink according to the detection result of the voltage detection circuit. Specifically, the pull-up power supply connected to the pull-up resistor of the microprocessor is 3.3V, and the voltage detected by the voltage detection circuit of the microprocessor is the voltage divided by the voltage dividing network, that is, the voltage at the connection point of the pull-up resistor and the NTC temperature sensor.

[0038] Therefore, when the plugging assembly is not plugged in properly, the voltage dividing network composed of the pull-up resistor and the NTC temperature sensor is disconnected. At this time, the voltage detected by the voltage detection circuit is the open circuit voltage (the value is close to 3.3V); in other words, if the voltage value detected by the voltage detection circuit is in the range of about 3.3V, the microprocessor controls the indicator light 300 to go out, indicating that the battery pack 100 is not successfully connected at this time; if the voltage detected by the voltage detection circuit is not the open circuit voltage, the indicator light lights up in the first state.

[0039] As Figure 2 shown, the NTC temperature sensor 120 and the battery cells 110 of the battery pack are arranged in the same battery chamber; the battery pack 100 is also provided with a battery protection circuit 130, which is connected in parallel across the positive and negative terminals of the battery cells 110 of the battery pack.

[0040] As a conventional means, when the external AC power supply is normally powered, it is driven by normal lighting to light up the lighting load;

[0041] When a fault occurs in the external AC power supply, the output signal of the AC-DC converter is 0, and the first sampling circuit will collect the signal that the external AC power supply is not connected. In this case, the emergency conversion module will control the conversion switch to open, so that the emergency lighting branch is connected, that is, it will immediately switch to supply power to the lighting load by the battery pack 100.

[0042] In one embodiment, the BMS module is connected to the battery pack 100 through the plug-in component 200. Specifically, the output end of the BMS module is connected to the first contact and the second contact on the second plug-in through a controllable switch; and the microprocessor is connected to the third contact of the second plug-in.

[0043] The microprocessor is configured with a first IO port, a second IO port, and a third IO port. The first IO port is connected to the contact on the second plug-in corresponding to the third contact, and the voltage of the contact is detected through the first IO port; the second IO port is connected to the control end of the BMS module, that is, when the second IO port sends an enable signal to the control end, the controllable switch between the BMS module and the second plug-in is closed; the third IO port is connected to the indicator light.

[0044] The microprocessor detects the voltage of the contact through the first IO port. If the detected voltage is within the preset temperature control voltage range, the microprocessor conducts or adjusts the charging current of the battery pack by the BMS module through the second IO port; if the detected voltage exceeds the preset temperature control voltage range, the microprocessor turns off the charging current of the battery pack by the BMS module through the second IO port; if the detected voltage is the open circuit voltage, the microprocessor turns off, lights up, or flashes the indicator light through the third IO port to prompt the user that the battery pack is not connected, and at this time, it must be beyond the preset temperature control voltage range, and the second IO port will not send an enable signal to the control end of the BMS module.

[0045] In a special embodiment, the charging of the battery pack 100 by the external AC power supply can also be controlled according to the detection result of the voltage detection circuit:

[0046] The NTC temperature sensor will exhibit different resistance values at different temperatures, which will affect the voltage divided by the voltage dividing network: the lower the temperature, the greater the resistance value of the NTC temperature sensor, and the smaller the voltage value detected by the voltage detection circuit; the higher the temperature, the smaller the resistance value of the NTC temperature sensor, and the greater the voltage value detected by the voltage detection circuit.

[0047] When the ambient temperature of the battery pack 100, such as 0°C (low temperature), is measured through pre-tests, the voltage value detected by the voltage detection circuit is 0.25V. When the ambient temperature of the battery pack 100 is 65°C (high temperature), the voltage value detected by the voltage detection circuit is 1.75V. The microprocessor compares the detection result of the voltage detection circuit with a preset value to control the on / off of the charging circuit: It can be achieved through a program. If the detected value is less than 0.25V or greater than 1.75V, the MCU sends an instruction to the BMS module through the communication unit, so that the BMS module controls the charging circuit of the battery pack 100 to be disconnected;

[0048] In another embodiment, the emergency-driven battery charging management module includes a logic gate circuit containing a comparator to replace the microprocessor. The logic gate circuit includes a first comparator (which can be an operational amplifier device), a second comparator, and a logic AND gate. The voltages detected by the voltage detection circuit are respectively connected to the non-inverting input terminal of the first comparator and the inverting input terminal of the second comparator. The inverting input terminal of the first comparator is connected to 0.25V, and the non-inverting input terminal of the second comparator is connected to 1.75V. Only when the voltage value detected by the voltage detection circuit is between 0.25V and 1.75V, both comparators output 1. The two input terminals of the logic AND gate are connected to the output terminals of the two comparators. At this time, the logic AND gate outputs a high level to the BMS module, which is equivalent to the BMS module receiving a charging instruction. Therefore, the charging circuit of the battery pack 100 is controlled to be turned on; if the AND gate outputs a low level, the BMS module controls the charging circuit to be disconnected.

[0049] Specifically, the AC-DC converter includes an input filter, a rectifier filter, and a high-frequency converter. Among them, the input terminal of the input filter is connected to an external AC power supply, and the rectifier filter is connected to the output terminal of the input filter and the input terminal of the high-frequency converter;

[0050] The high-frequency converter is configured to output a constant-voltage direct current. The high-frequency converter is connected to the BMS module through a power switch. The duty cycle of the power switch is controlled by the BMS module. That is, when the logic AND gate outputs a low level, the BMS module controls the power switch to turn off. When the voltage detection value is closer to the reference voltage corresponding to 25°C to 40°C, the BMS module controls the duty cycle of the power switch to be larger.

[0051] In one embodiment, the switching switch is a MOS transistor or a thyristor. The emergency conversion module can control the duty cycle of the switching switch in real time to achieve constant power output through the following method:

[0052] The second sampling circuit samples the current signal and voltage signal of the lighting load, and the output terminal of the second sampling circuit is connected to the emergency conversion module;

[0053] The emergency conversion module controls the duty cycle of the conversion switch according to the sampling result of the second sampling circuit: according to the sampled current flowing through the lighting load and its terminal voltage, calculate the output power. If it is less than a preset constant power threshold, control the duty cycle of the conversion switch to increase; if the calculated output power is greater than the preset constant power threshold, control the duty cycle of the conversion switch to decrease.

[0054] In an embodiment of the present invention, an emergency lighting device is provided, including a lighting load, a normal lighting driver, and the emergency lighting driver as described above.

[0055] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0056] The above are only specific embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An emergency lighting system, comprising a battery pack, a lighting load, an emergency driver, and a plugging component for connecting the battery pack to the emergency driver, wherein the emergency driver includes an AC-DC converter, a battery discharge circuit, and a battery charging management module; characterized in that, The plug-in component includes a first plug-in part on the battery pack side and a second plug-in part on the emergency drive side, both of which are provided with at least three electrical connection contacts. Among them, the first contact of the first plug-in part is connected to the positive electrode of the battery pack, the second contact is connected to the negative electrode of the battery pack, and the third contact is connected to the first contact or the second contact through a temperature sensor or an equivalent temperature sensing circuit; When the plug-in component is connected, the voltage of the contact on the second plug-in part corresponding to the third contact changes with the change of the battery pack temperature; when the plug-in component is disconnected, the voltage of the contact on the second plug-in part corresponding to the third contact is an open circuit voltage outside the temperature control voltage range.

2. The emergency lighting system according to claim 1, wherein the second plug-in part is connected to the battery charging management module, and the emergency lighting system further includes an indicator light electrically connected to the battery charging management module; When the plug-in component is disconnected, the battery charging management module controls the indicator light to give a prompt operation indicating that the battery pack is not connected.

3. The emergency lighting system according to claim 2, characterized in that, The battery charging management module includes a temperature control module, and the temperature control module is connected to the contact on the second plug-in part corresponding to the third contact.

4. The emergency lighting system according to claim 3, characterized in that, The temperature control module is a microprocessor, which is configured with a first IO port. The first IO port is connected to the contact on the second plug-in part corresponding to the third contact, and the voltage of the contact is detected through the first IO port.

5. The emergency lighting system according to claim 4, wherein The battery charging management module further includes a BMS module, which is respectively connected to the contacts on the second plug-in part corresponding to the first contact and the second contact through controllable switches; The microprocessor is further configured with a second IO port, which is connected to the control end of the BMS module.

6. The emergency lighting system according to claim 5, wherein, The microprocessor is further configured with a third IO port, which is connected to the indicator light.

7. The emergency lighting system according to claim 3, wherein, The temperature control module is a logic gate circuit containing a comparator.

8. The emergency lighting system according to claim 1, characterized in that, The temperature sensor or the equivalent temperature sensing circuit is an NTC temperature sensor, which is arranged inside the battery compartment of the battery pack or in the adjacent area outside the battery compartment.

9. The emergency lighting system according to claim 1, characterized in that, The battery pack is further provided with a battery protection circuit, which is connected in parallel at both ends of the positive and negative electrodes of the battery cells of the battery pack.

10. The emergency lighting system according to claim 1, wherein, The battery discharge circuit includes an emergency conversion module and a DC-DC converter. The emergency conversion module includes a first sampling circuit and a conversion switch. The first sampling circuit is configured to sample the output signal of the AC-DC converter, and the emergency conversion module controls the opening and closing actions of the conversion switch according to the sampling result.

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