Emergency lighting driver and operating method thereof

Abstract

An emergency driver (100) of the present disclosure for driving an emergency lighting device comprises: a battery (101) operably coupled to the emergency lighting device; a preferably resistive temperature sensor (104) configured for generating a temperature signal (TS) corresponding to a temperature of the battery (101); at least a resistive heating element (102) configured for raising the temperature of the battery (101) by a heating operation; and a controller (106) configured to perform reading of the temperature sensor (104) and operation of the resistive heating element (102) in a time division multiplexed manner.

Description

[0001] manual:

[0002] The present invention relates to an emergency driver for driving an emergency lighting device, and more particularly to an emergency driver for driving an emergency lighting device capable of performing both temperature sensing and heating of a battery provided therein in a time-division multiplexing manner.

[0003] Typically, charging lithium batteries at sub-zero temperatures should be avoided due to a chemical phenomenon known as "lithiation," which can be caused by the charging current forcing lithium ions to move at a faster-than-usual reaction rate and accumulate on the anode surface. Emergency drive applications used for powering, especially outdoor emergency lights or in other demanding industrial applications, can be affected by this phenomenon when attempting to charge batteries therein at sub-zero temperatures or at low temperatures.

[0004] One possible solution for charging the battery at sub-zero temperatures is to embed a heating element around the battery to raise the battery's temperature to an acceptable temperature when charging should begin. However, the additional circuitry (particularly the additional terminals that may be required to power the heating element) may increase the overall size of the circuit and may increase the complexity of packaging and production of the emergency driver, particularly due to the increased number of wire connections or power supply terminals.

[0005] In view of the above, embodiments of the present disclosure are intended to provide an emergency driver for driving an emergency lighting device such as an LED lighting device, an emergency lighting system, and an operating method. One object is to provide an emergency lighting device driving solution that can perform both temperature sensing and heating of a battery disposed therein, especially in a compact (i.e., size or area constraints) and simplified (i.e., connection, packaging, or production complexity) manner.

[0006] These and other objects are achieved by the embodiments of the present disclosure as described in the attached independent claims. Advantageous specific implementations of the embodiments are further defined in the dependent claims.

[0007] According to a first aspect of the present invention, an emergency driver for driving an emergency lighting device is provided. The emergency driver comprises a battery operably connected to the emergency lighting device, a preferably resistive temperature sensor configured to generate a temperature signal corresponding to the temperature of the battery, at least a resistive heating element configured to increase the temperature of the battery by a heating operation, and a controller configured to perform the reading of the temperature sensor and the operation of the resistive heating element in a time-division multiplexed manner. Advantageously, the heating operation for increasing the battery temperature and the reading of the temperature sensor can be performed in a multitasking manner to detect the battery temperature and provide power to the battery heating element.

[0008] In a specific implementation form of the first aspect, the controller is configured to read the temperature signal generated by the temperature sensor to measure the temperature of the battery in a first cycle or temperature sensing phase, and also to provide a controlled voltage to the resistive heating element for the heating operation based on the measured temperature of the battery in a subsequent second cycle or battery heating phase.

[0009] In this regard, the temperature sensing phase and the battery heating phase may be performed in any order required by the application. For example, the controller may first initiate the temperature sensing phase to measure the battery temperature, and in the subsequent battery heating phase, the controller may accordingly supply controlled power to the battery heating element for the heating operation. Alternatively, the controller may first initiate the battery heating phase to supply the controlled power to the battery heating element for the heating operation, and in the subsequent temperature sensing phase, the controller may measure the battery temperature.

[0010] In a specific implementation form of the first aspect, the temperature sensor and the resistive heating element are operably coupled to a common terminal, whereby the controller is configured to read the temperature signal from the common terminal in the first cycle and also to provide the controlled voltage to the common terminal in the second cycle. Advantageously, particularly for heating the battery in addition to the temperature sensing, the number of terminals or wire connections required can be limited to a single common terminal for both operations.

[0011] In a specific implementation form of the first aspect, the temperature sensor and the resistive heating element are coupled along a single electrical path relative to the common terminal. Advantageously, reading the temperature signal from the temperature sensor (particularly at the common terminal) and supplying power to the battery heating element can be performed in a simplified manner via the single electrical path.

[0012] In a specific implementation form of the first aspect, the emergency drive further comprises means for bypassing the temperature sensor, whereby the controller is configured to bypass the temperature sensor in the second cycle. Advantageously, the temperature sensor can be selectively bypassed, particularly during the battery heating phase, thereby facilitating an efficient heating operation by means of the single common terminal.

[0013] In a specific implementation form of the first aspect, the emergency drive also includes a first switching element and a second switching element, whereby the controller is configured to operate the first switching element and the second switching element in a complementary manner, wherein a conduction period of the first switching element corresponds to the first cycle, and a conduction period of the second switching element corresponds to the second cycle.

[0014] In other words, the first switch element may be switched on and the second switch element may be switched off to start the temperature sensing phase to configure the temperature sensor to generate the temperature signal corresponding to the temperature of the battery. Thereafter, the first switch element may be switched off and the second switch element may be switched on to start the battery heating phase, in particular for powering the battery heating element and bypassing the temperature sensor.

[0015] In a specific implementation form of the first aspect, the controller is configured to operate the first switching element and the second switching element in the complementary manner at a fixed frequency. For example, the controller can operate the first switching element and the second switching element in a complementary manner, in particular in a pulse width modulation (PWM) mode with a fixed frequency of 500 Hz.

[0016] In a specific implementation form of the first aspect, the controller is configured to control the conduction period or duty cycle of the second switch element based on a predetermined temperature of the battery. In other words, the controller can timely control the duration of the battery heating phase based on the measured temperature of the battery, or in order to adjust the heating power, or based on the temperature of the battery suitable for starting the charging operation of the battery, or a combination thereof.

[0017] In a specific implementation form of the first aspect, the first switch element and the second switch element are active switch elements, preferably transistors. More preferably, the first switch element and the second switch element are field effect transistors (FETs). Advantageously, for example, pulse-based complementary operation of the switch elements can be effectively performed.

[0018] In a specific implementation form of the first aspect, the controller is configured to read the temperature signal generated by the temperature sensor during the first cycle with a predetermined time delay after the start of the first cycle. Advantageously, the delay or dead time between the battery heating phase and the temperature sensing phase can avoid any overlap of these phases, in particular allowing the temperature signal to be effectively read from the temperature sensor after a preceding battery heating operation.

[0019] In a specific implementation form of the first aspect, the controller is configured to average the measured temperature of the battery based on the temperature signal generated by the temperature sensor over a predetermined number of cycles. This can advantageously facilitate a stable reading of the temperature sensor.

[0020] In a specific implementation form of the first aspect, the battery is a lithium-ion battery. Alternatively, the battery can be a nickel-metal hydride (NiMH) type battery.

[0021] In a specific implementation form of the first aspect, the temperature sensor is a thermistor. Preferably, the temperature sensor is a negative temperature coefficient (NTC) thermistor.

[0022] According to a second aspect of the present disclosure, an emergency lighting system is provided, comprising the emergency driver according to the first aspect of the present disclosure, an emergency lighting device operably connected to the emergency driver, and a housing containing the emergency driver and the emergency lighting device, wherein the housing can be mounted relative to a wall or a surface.

[0023] According to a third aspect of the present disclosure, a method for time-division multiplexed resistive heating and preferably resistive temperature sensing of the battery of the emergency drive of the first aspect is provided. The method comprises the following steps: generating a temperature signal corresponding to the temperature of the battery in a first cycle and measuring the temperature of the battery based on the temperature signal; and providing a controlled voltage based on the measured temperature of the battery in a subsequent second cycle to increase the temperature of the battery through a heating operation.

[0024] In a specific implementation form of the third aspect, the method further includes the steps of reading the temperature signal from a common terminal of the emergency driver and providing a controlled voltage to the common terminal.

[0025] It should be noted that the emergency lighting system according to the second aspect and the method according to the third aspect correspond to the emergency driver according to the first aspect and its specific implementation forms. Therefore, the emergency lighting system of the second aspect and the method of the third aspect may have corresponding specific implementation forms. In addition, the emergency lighting device of the second aspect and the method of the third aspect achieve the same advantages and effects as the emergency driver of the first aspect and its corresponding specific implementation forms.

[0026] The above aspects and specific implementation forms will be explained in the following description of specific embodiments in conjunction with the accompanying drawings, in which:

[0027] Figure 1 shows an exemplary block diagram representation of an emergency driver according to an embodiment of the present disclosure;

[0028] Figure 2 shows an exemplary circuit representation of an emergency driver according to an embodiment of the present disclosure;

[0029] Figure 3 illustrates exemplary timing operations for time-division multiplexed heating and temperature sensing according to embodiments of the present disclosure;

[0030] Figure 4 shows an exemplary block diagram representation of an emergency lighting system according to an embodiment of the present disclosure; and

[0031] Figure 5 An exemplary flow chart illustrating a method according to an embodiment of the present disclosure is shown.

[0032] Reference will now be made in detail to embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. However, the following embodiments of the present disclosure may be modified differently, and the scope of the present disclosure is not limited by the following embodiments. Reference numerals used for similar entities in different embodiments are partially omitted.

[0033] exist Figure 1 , an exemplary block diagram representation of an emergency driver 100 according to an embodiment of the present disclosure is illustrated. The emergency driver 100 may include a battery or battery system or unit 101 for supplying power to an emergency lighting device (not shown). Terminals B+ and B- may represent battery terminals, and terminals P+ and P- may represent rear protection battery terminals. The emergency driver 100 may also include a heating element or battery heating element 102, preferably a resistive heating element, which is positioned at or around the battery 101 to heat the battery 101 when supplied with voltage, i.e., to increase the temperature of the battery 101, for example via thermal conduction. The heating element 102 may have a predetermined or fixed voltage and / or current rating.

[0034] The emergency driver 100 may optionally include a protection circuit 103 operatively coupled to the battery 101 and may be configured to protect the battery in the event of a short circuit, overcharge, over discharge, etc. However, if the battery is a NiMH type battery, the protection circuit 103 may be omitted. The emergency driver 100 may also include a temperature sensor 104, preferably a resistive temperature sensor, particularly positioned at or near the battery 101, sufficient for sensing the battery temperature. In this way, the temperature sensor 104 may generate a temperature signal T corresponding to the battery temperature at a given moment. S , such as sensing current.

[0035] In this regard, the battery 101 , the heating element 102 , the optional protection circuit 103 , and the temperature sensor 104 may be collectively referred to as a protection section 110 of the emergency driver 100 , which is often referred to as a protection control module (PCM) for a lithium battery.

[0036] The emergency driver 100 may further include a driver circuit 105 for driving an emergency lighting device, such as an LED driver, and also for operating and / or controlling the heating element 102 and the temperature sensor 104. The driver circuit 105 may include a controller 106 configured to perform reading of the temperature sensor 104 and operation of the heating element 102 in a time-division multiplexed manner.

[0037] The controller 106 may include or may be one or more application specific integrated circuits (ASICs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), microcontrollers, etc. The drive circuit 105 and the controller 106 may be collectively referred to as a driver section 120 of the emergency driver 100 .

[0038] In this regard, the controller 106 may read the temperature signal T generated by the temperature sensor 104 in a first cycle or in a temperature sensing phase of operation. S The temperature of the battery 101 is measured and a controlled voltage is provided to the resistive heating element 102 for heating operation also in a subsequent second cycle or in a battery heating phase of operation, in particular based on the measured temperature of the battery 101 .

[0039] It is noted that the temperature sensor 104 and the resistive heating element 102 are preferably coupled to a common terminal T, wherein the controller 106 may be configured to read a temperature signal T from the common terminal T during a temperature sensing phase. S And also provides a controlled voltage to the common terminal T during the battery heating phase.

[0040] exist Figure 2 , an exemplary circuit representation of the emergency driver 100 according to an embodiment of the present disclosure is illustrated. In particular, the exemplary circuit representation may correspond to an equivalent circuit representation of the emergency driver 100. The left side of the exemplary representation may correspond to an equivalent circuit representation implemented within the protection segment of the PCM 110 of the emergency driver 100, and the right side of the exemplary representation may correspond to an equivalent circuit representation implemented within the driver segment 120 of the emergency driver 100.

[0041] For example, the battery 101 may be coupled to the rear protection battery terminals P+, P-, and the heating element 102 may be arranged around the battery 101. The equivalent resistance of the heating element 102 is represented by R h , and the equivalent resistance of the temperature sensor is expressed as R NTC . Resistor R h and R NTC The resistors may be connected in series to the common terminal T. A bypass circuit 202 may also be provided between the resistor and the common terminal T, in particular for bypassing the resistor during a battery heating phase. NTC The bypass circuit 202 may include a transistor Q1 , which may be driven by a Zener diode Z1 having a predetermined or fixed reverse voltage rating or threshold, particularly in reverse mode to act as a voltage controller.

[0042] For example, if the voltage at the common terminal T is higher than the threshold voltage of the Zener diode Z1, the transistor Q1 receives the maximum amount of base current to operate in the saturation region, i.e., the switching transistor Q1 is fully turned on, thereby effectively bypassing the temperature sensor R NTC However, if the voltage at the common terminal T is lower than the threshold voltage of the Zener diode Z1 , the transistor Q1 receives 0 base current to operate in the cutoff region, ie, the switching transistor Q1 is completely turned off, and the resistor remains connected in series with respect to the common terminal T.

[0043] In addition, the resistor R h and R NTC The time division multiplexing operation of can be realized by means of two transistors M1 and M2, which can be operated in a PWM mode in a complementary manner by the controller 106 by means of a transistor driver TD. For example, the controller 106 can provide a gate voltage V gate To control the on-time or duty cycle of transistors M1 and M2.

[0044] For example, transistors M1 and M2 are P-channel enhancement MOSFETs, and a transistor driver is directly connected to the gate of M2 to drive transistor M2, while the driver is connected to the gate of M1 via a third transistor M3, in particular an N-channel enhancement MOSFET, to drive transistor M1 in a complementary manner.

[0045] For example, a negative (i.e., less than 0V) gate signal provided by transistor driver TD may be applied at the gates of M2 and M3, wherein M2 is turned on and M3 remains off. Alternatively, a positive (i.e., greater than 0V) gate signal provided by transistor driver TD may be applied at the gates of M2 and M3, wherein M3 is turned on and M2 remains off, thereby turning on M1 via M3. In this way, transistors M1 and M2 may be operated in a cyclic or switching manner, providing a supply voltage for heating operation and a sensing voltage for temperature sensing at a common terminal T in a cyclic or switching manner.

[0046] In the following, an exemplary operation of the emergency driver 100 is described to achieve time-division multiplexing operation of the heating element 102 and the temperature sensor 104. The transistor M2 can be coupled to a 13.5V flyback rail voltage 204, and the transistor M1 can be coupled to a low voltage power supply or a 3.3V reference voltage 203. A freewheeling or flyback diode D can be provided at the common terminal T to avoid the possibility of a short circuit with the heating element R. h The voltage spike across transistors M1 and M2 is caused by the stray inductance present in series.

[0047] To start the temperature sensing phase, the controller 106 switches on transistor M1 and switches off transistor M2 via transistor driver TD and transistor M3. The reference voltage 203 is thus applied at the common terminal T via the pull-up resistor R5. The Zener diode Z1 has a threshold of 5.6V, and since the reference voltage 203 at the terminal T is lower than the threshold of the Zener diode Z1, the transistor Q1 is turned off. Therefore, the voltage across the heating element R h and temperature sensor R NTC The combined resistance of the resistor R applies the reference voltage 203. In this case, the voltage generated at the common terminal T is NTCand is therefore read by controller 106 via a resistor divider formed by resistors R6 and R7 (V T_measured ), in particular for determining the current battery temperature.

[0048] To start the battery heating phase, the controller 106 turns on transistor M2 and turns off transistor M1 via transistor driver TD and transistor M3, and thus the flyback rail voltage 204 is applied at the common terminal T. Since the flyback rail voltage 204 at terminal T is higher than the threshold of the Zener diode Z1, the transistor Q1 remains turned on and the resistor R NTC is bypassed by transistor Q1. In this case, the flyback rail voltage 204 is applied directly to the heating element R h For heating operation.

[0049] Figure 3 Graph 301 shows the voltage V at the common terminal T over time t during an exemplary battery heating phase 311 and an exemplary temperature sensing phase 312. T It can be seen that during the battery heating phase, transistor M1 is turned off and transistor M2 is turned on, while during the temperature sensing phase, transistor M1 is turned on and transistor M2 is turned off. During the battery heating phase, the voltage V at the common terminal T is T represents the flyback rail voltage of 13.5V, and during the temperature sensing phase, the voltage V at the common terminal T T Represents a temperature sensor R used for temperature sensing NTC The voltage across the terminals is a function of the voltage across the terminals.

[0050] The on-time or duty cycle DT of transistor M2 is controlled by controller 106 based on the amount of battery heating required, preferably in a closed-loop manner by comparing the desired or predetermined temperature with the actual or current battery temperature. Generally speaking, in one exemplary operation, controller 106 may control the on-time of transistor M2 at a maximum duty cycle of 80%, so that transistor M1 may also be enabled.

[0051] Graph 302 shows the heating element R h The voltage V Rh , especially the voltage over time t during the battery heating phase 311 and the temperature sensing phase 312, especially during an exemplary operation. It can be seen that during the battery heating phase 311, the heating element R h The voltage V Rh represents a 13.5V flyback rail voltage, and during the temperature sensing phase 312, the heating element R h The voltage V RhThis is because the resistor R h and R NTC The series connection with respect to the common terminal T, wherein the reference voltage 203 is applied to the series connection R h and R NTC Generally speaking, R h The ohmic value of R NTC The ohmic value is very small compared to the h The 20Ω to R NTC 2KΩ-30KΩ), and therefore the most significant voltage drop appears at the resistor R NTC Both ends.

[0052] Graph 303 shows the temperature sensing signal V sensed or sampled by the controller 106. T_measuerd , in particular, through the voltage divider network of resistors R6 and R7 as described above. Point 331 corresponds to a sampling instant at which the controller 106 can obtain one or more samples of the temperature sensing signal. This or these sampling instants can be timed relative to the trailing edge of the PWM on-time when transistor M1 is turned off, and have a fixed delay or dead time d thereafter (e.g., a 200 microsecond delay). The controller 106 can average the sensed values ​​over several cycles to obtain a stable reading. For example, for a heating power on the order of 2W, when powered from a 13.5V flyback rail, the duty cycle of transistor M2 will be approximately 22%. The sampling voltage used for temperature sensing depends on the voltage across R NTC The voltage can vary from 109mV to 483mV for 75°C to 0°C respectively.

[0053] For example, if the battery temperature is measured to be below 5° C., the controller 106 may initiate the battery heating phase 311 , in particular by applying heat to the heating element R h Controlled power is supplied to start up to raise the battery temperature to 5°C, and after that the battery charging can be started to avoid the cold charging phenomenon. After the battery temperature is measured to be about 10°C after the battery charging process is started, the controller 106 can turn off the transistor M2 and turn on the transistor M1 for a longer duration or permanently (i.e., M2 with 0 duty cycle) to cut off the heating element R h The power supply at the position where the temperature sensing operation continues. In this case, the controller 106 can continue to sample the temperature sensing signal in an asynchronous manner and at regular predetermined intervals.

[0054] exist Figure 4, an exemplary block diagram representation of an emergency lighting system 400 according to an embodiment of the present disclosure is illustrated. The emergency lighting system 400 may include an emergency driver 100, an emergency lighting device 401, and a housing 402. The housing 402 may completely surround the emergency driver 100 and the emergency lighting device 401. The housing 402 may be mountable relative to a wall or surface (not shown). The housing 402 may be constructed of galvanized metal, polycarbonate, or glass fiber reinforced plastic, or a combination thereof.

[0055] The emergency lighting device 401 may correspond to or be an LED-based lighting body. The emergency lighting device 401 may be connected to the emergency driver 100 via the rear protection battery terminals P+, P− of the emergency driver 100 , and in particular, may be powered by the battery 101 of the emergency driver 100 .

[0056] The emergency lighting system 400 may correspond to an emergency exit route lighting system that may assist evacuees in leaving a residence or industrial structure in an emergency such as a fire, earthquake, etc. by providing emergency lighting around an exit door and / or alternative emergency exits and / or escape routes.

[0057] exist Figure 5 , an exemplary embodiment of a method 500 according to an embodiment of the present disclosure is illustrated. In a first step 501, in particular in a first cycle, a temperature signal corresponding to the temperature of a battery is generated, and the temperature of the battery is measured based on the temperature signal. In a second step 502, a controlled voltage is provided in a second cycle to increase the temperature of the battery through a heating operation based on the measured temperature of the battery.

[0058] Thus, the embodiments of the present disclosure effectively reduce the conventional number of terminals required between the driver electronics and the battery PCM. The solution proposed by the embodiments of the present disclosure foresees the need for a total of only three terminals or connectors for transmitting the supply voltage from the battery to the emergency lighting device (via terminals P+, P-), for sensing the battery temperature (via time-division multiplexing terminal T), and for actively or electrically heating the battery (via time-division multiplexing terminal T).

[0059] It is important to note that in the specification and in the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. A single element or other unit may fulfil the functions of several entities or items recited in the claims. Furthermore, the word "coupled" means that elements may be directly connected together or may be coupled via one or more intermediate elements. Furthermore, the disclosure regarding any aspect is also relevant to other aspects regarding the present disclosure.

[0060] Although the present disclosure has been shown and described with respect to one or more specific embodiments, equivalent alternatives and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. In addition, although specific features of the present disclosure may have been disclosed with respect to only one of several specific implementations, such features may be combined with one or more other features of other specific implementations according to the expectations and advantages of any given or particular application.

Claims

1. An emergency driver (100) for driving an emergency lighting device, comprising: a battery (101) operably connected to the emergency lighting device, is configured to generate a temperature signal (T) corresponding to the temperature of the battery (101) S ), preferably a resistive temperature sensor (104), at least a resistive heating element (102) configured to increase the temperature of the battery (101) by a heating operation, and A controller (106) is configured to perform reading of the temperature sensor (104) and operation of the resistive heating element (102) in a time-division multiplexed manner.

2. The emergency actuator according to claim 1, wherein: The controller (106) is configured to read the temperature signal (T) generated by the temperature sensor (104) in a first cycle. S ) to measure the temperature of the battery (101), and also in a subsequent second cycle, provide a controlled voltage (V) to the resistive heating element (102) based on the measured temperature of the battery (101). T ) for the heating operation.

3. The emergency actuator according to claim 2, wherein: The temperature sensor (104) and the resistive heating element (102) are operably coupled to a common terminal (T), whereby the controller (106) is configured to read the temperature signal (T) from the common terminal (T) during the first cycle. S ), and also provides the controlled voltage (V T ).

4. The emergency actuator according to claim 3, wherein: The temperature sensor (104) and the resistive heating element (102) are coupled along a single electrical path (201) relative to the common terminal (T).

5. The emergency drive according to any one of claims 1 to 4, further comprising means (202) for bypassing the temperature sensor (104), whereby the controller (106) is configured to bypass the temperature sensor (104) in the second cycle.

6. The emergency drive according to any one of claims 1 to 5, further comprising a first switching element (M1) and a second switching element (M2), whereby the controller (106) is configured to operate the first switching element (M1) and the second switching element (M2) in a complementary manner, wherein a conduction period of the first switching element (M1) corresponds to the first cycle, and a conduction period of the second switching element (M2) corresponds to the second cycle.

7. The emergency actuator according to claim 6, wherein: The controller is configured to operate the first switching element (M1) and the second switching element (M2) in the complementary manner at a fixed frequency.

8. The emergency drive according to claim 6 or 7, wherein: The controller is configured to control the on-period of the second switching element (M2) based on a predetermined temperature of the battery (101).

9. The emergency drive according to any one of claims 6 to 8, wherein: The first switching element (M1) and the second switching element (M2) are active switching elements, preferably transistors.

10. The emergency drive according to any one of claims 1 to 9, wherein: The controller (106) is configured to read the temperature signal (T) generated by the temperature sensor (104) during the first cycle with a predetermined time delay (d) after the first cycle begins. S ).

11. The emergency drive according to any one of claims 1 to 10, wherein: The controller (106) is configured to, over a predetermined number of cycles, determine the temperature signal (T S ) averages the measured temperatures of the battery (101).

12. The emergency drive according to any one of claims 1 to 11, wherein: The battery (101) is a lithium-ion battery.

13. The emergency drive according to any one of claims 1 to 12, wherein: The temperature sensor (104) is a thermistor.

14. An emergency lighting system (400), comprising: The emergency drive (100) according to claims 1 to 13, an emergency lighting device (401) operably coupled to the emergency driver (100), and A housing (402) surrounds the emergency drive (100) and the emergency lighting device, and the housing can be mounted relative to a wall or a surface.

15. A method (500) for time-multiplexed resistive heating and preferably resistive temperature sensing of a battery for an emergency driver, comprising: generating (501) a temperature signal corresponding to the temperature of the battery in a first cycle and measuring the temperature of the battery based on the temperature signal, and A controlled voltage is provided (502) in a subsequent second cycle to increase the temperature of the battery through a heating operation based on the measured temperature of the battery.

16. The method according to claim 15, wherein: The method further comprises: The temperature signal is read from a common terminal of the emergency driver and the controlled voltage is provided to the common terminal.

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