High-power alternating-current emergency lighting control device, lamp and control method

Abstract

The invention discloses a high-power alternating-current emergency lighting control device, a lamp and a control method, and relates to the technical field of emergency lighting, a series battery pack comprises a plurality of batteries connected in series, an emergency light source comprises a plurality of LED lamp sets connected in series, and each LED lamp set comprises a plurality of 3V LED lamp beads connected in parallel. Therefore, the voltage of the emergency light source can be remarkably increased, the requirement for current is low, the output power of the emergency light source can be remarkably improved, the main light source is lightened and the series battery pack is charged when the power grid state is normal power supply and the switch state is closed, and the main light source is turned on and the series battery pack is charged when the power grid state is stopped power supply and the switch state is closed. The series battery pack is discharged, the emergency light source is lightened, and the large output power is provided.

Description

Technical Field

[0001] The present application relates to the technical field of emergency lighting, and in particular to a high-power AC emergency lighting control device, a lamp and a control method using a light emitting diode as a load. Background Art

[0002] At present, there is a special kind of lamp on the market - AC emergency lighting lamp. After the mains power grid stops supplying power, this kind of AC emergency lighting lamp can still provide emergency lighting for a period of time, which has certain practical value for the vast underdeveloped areas of the world. In the era of energy-saving fluorescent lighting, this kind of AC emergency lighting lamp has already existed. When the mains power grid is supplying power normally, it provides normal lighting and charges the energy storage battery in the lamp at the same time; when the mains power grid stops supplying power, the energy storage battery is discharged to provide emergency lighting for a limited time.

[0003] As a new generation of lighting source, light emitting diode (LED) has been widely used. After entering the era of LED lighting, AC emergency lighting fixtures with LED as load also appeared. However, the output power of emergency light source in AC emergency lighting fixtures is small, generally only 2 to 5 watts, and the maximum is no more than about 10 watts.

[0004] Based on this, a high-power AC emergency lighting technology is urgently needed. Summary of the invention

[0005] The purpose of the present application is to provide a high-power AC emergency lighting control device, a lamp and a control method, which can provide high output power.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In a first aspect, the present application provides a high-power AC emergency lighting control device, the high-power AC emergency lighting control device comprising: a rectifier bridge, a switch constant current control circuit, a transformer, a main light source, an emergency lighting controller, a series battery pack and an emergency light source;

[0008] The rectifier bridge is connected to the power grid; the rectifier bridge is used to convert the AC power output from the power grid into DC power;

[0009] The switch constant current control circuit is connected to the rectifier bridge, and the primary coil of the transformer and the main light source are both connected to the switch constant current control circuit; the switch constant current control circuit is used to convert the direct current into converted direct current that can power the main light source;

[0010] The emergency lighting controller is connected to the secondary coil of the transformer, the series battery group and the emergency light source respectively; the emergency lighting controller is used to monitor the state of the power grid and the switch state of the switch set on the connection line between the rectifier bridge and the power grid, and when the power grid state is normal power supply and the switch state is closed, the series battery group is charged, and when the power grid state is stopped and the switch state is closed, the series battery group is discharged to light up the emergency light source;

[0011] The series battery pack includes a plurality of batteries connected in series; the emergency light source includes a plurality of LED light groups connected in series, and each LED light group includes a plurality of LED lamp beads connected in parallel.

[0012] Optionally, the first input end of the rectifier bridge is connected to the first output end of the power grid, and the second input end of the rectifier bridge is connected to the second output end of the power grid;

[0013] The first input end of the switch constant current control circuit is connected to the first output end of the rectifier bridge, and the second input end of the switch constant current control circuit is connected to the second output end of the rectifier bridge;

[0014] The first end of the primary coil of the transformer is connected to the output end of the switch constant current control circuit;

[0015] The first end of the main light source is connected to the second end of the primary coil of the transformer, and the second end of the main light source is connected to the first output end of the rectifier bridge;

[0016] A first end of the secondary coil of the transformer is connected to a first end of the main light source;

[0017] The first input terminal of the emergency lighting controller is connected to the second end of the secondary coil of the transformer, and the second input terminal of the emergency lighting controller is connected to the first end of the main light source;

[0018] The first end of the series-connected battery group is connected to the first output end of the emergency lighting controller, and the second end of the series-connected battery group is connected to the first end of the main light source;

[0019] The first end of the emergency light source is connected to the second output end of the emergency lighting controller, and the second end of the emergency light source is connected to the first end of the main light source.

[0020] Optionally, the high-power AC emergency lighting control device further includes: a first filter capacitor, and the first filter capacitor is connected in parallel with the main light source.

[0021] Optionally, the high-power AC emergency lighting control device also includes: a rectifier diode and a second filter capacitor, the rectifier diode is located between the secondary coil of the transformer and the emergency lighting controller, the first end of the rectifier diode is connected to the second end of the secondary coil of the transformer, and the first input end of the emergency lighting controller is connected to the second end of the rectifier diode; the first end of the second filter capacitor is connected to the second end of the rectifier diode, and the second end of the second filter capacitor is connected to the first end of the main light source.

[0022] Optionally, the high-power AC emergency lighting control device also includes: a current limiting resistor, which is located between the emergency lighting controller and the emergency light source, and the first end of the current limiting resistor is connected to the second output end of the emergency lighting controller, and the first end of the emergency light source is connected to the second end of the current limiting resistor.

[0023] Optionally, the emergency lighting controller includes a power grid and switch monitoring circuit, a charge and discharge management circuit, and a charge equalization circuit;

[0024] The grid and switch monitoring circuit is used to monitor the grid status and switch status;

[0025] The charge and discharge management circuit is connected to the power grid and the switch monitoring circuit and the charge equalization circuit respectively; the charge and discharge management circuit is used to charge the series battery group through the charge equalization circuit when the power grid state is normal power supply and the switch state is closed, and to discharge the series battery group when the power grid state is stopped power supply and the switch state is closed.

[0026] Optionally, the charging equalization circuit adopts a passive charging equalization circuit.

[0027] Optionally, the number of batteries connected in series is 4, and the number of LED light groups connected in series is 5.

[0028] In a second aspect, the present application provides a high-power AC emergency lighting fixture, which includes: a shell and a high-power AC emergency lighting control device located inside the shell, and the high-power AC emergency lighting control device adopts any of the high-power AC emergency lighting control devices described above.

[0029] In a third aspect, the present application provides a control method for a high-power AC emergency lighting control device as described above, the control method for a high-power AC emergency lighting control device comprising:

[0030] Monitor the grid status and switch status;

[0031] When the power grid is in a normal power supply state and the switch state is closed, charging the series-connected battery pack;

[0032] When the power grid is in the state of power failure and the switch is in the state of closing, the series-connected battery pack is discharged to light the emergency light source.

[0033] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0034] The present application provides a high-power AC emergency lighting control device, lamp and control method. The series battery pack is designed to include multiple batteries connected in series, and the emergency light source includes multiple LED lamp groups connected in series. Each LED lamp group includes multiple LED lamp beads connected in parallel, so that the voltage of the emergency light source can be significantly increased. The current requirement is low, and the output power of the emergency light source can be significantly improved. When the power grid state is normal power supply and the switch state is closed, the main light source is lit and the series battery pack is charged. When the power grid state is stopped and the switch state is closed, the series battery pack is discharged and the emergency light source is lit. The present application has the advantage of providing high output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the circuit structure of a traditional AC emergency lighting control device provided in Example 1 of the present application.

[0037] Figure 2 A schematic diagram of the circuit structure of a high-power AC emergency lighting control device provided in Example 1 of the present application.

[0038] Figure 3 This is a schematic diagram of the circuit structure of the emergency light source provided in Example 1 of the present application.

[0039] Figure 4 This is a schematic diagram of the circuit structure of the charging equalization circuit provided in Example 1 of the present application.

[0040] Reference numerals:

[0041] 015-current limiting resistor; 110-switch; 120-rectifier bridge; 130-battery pack; 131-first battery; 132-second battery; 133-third battery; 134-fourth battery; 140-second filter capacitor; 150-rectifier diode; 160-transformer; 170-first filter capacitor; 180-main light source; 190-emergency light source; 200-switch constant current control circuit; 210-freewheeling diode; 300-emergency lighting controller; 310-grid and switch monitoring circuit; 320-charge and discharge management circuit; 330-charge balancing circuit; 331-first error amplifier; 332-first PMOS tube; 333-second error amplifier; 334-second PMOS tube; 335-third error amplifier; 336-third PMOS tube; 337-fourth error amplifier; 338-fourth PMOS tube. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] Example 1

[0044] like Figure 1As shown in FIG. 1 , it is a circuit structure diagram of the second-generation LED AC emergency lighting device, which is characterized by high integration, the use of a dedicated AC emergency lighting control chip, lower solution cost, perfect protection measures, a significant reduction in the number of components, and a significant increase in production yield, which has been widely recognized by the market. Among them, the battery pack 130 is an energy storage component, generally a lithium battery or multiple lithium batteries in parallel, and the lithium battery can be a 3.7V or 3.2V lithium battery. The main light source 180 is the main light source when the power grid is normally powered. Generally, the load voltage is high, and the characteristics are high voltage and low current. The emergency light source 190 is an emergency light source after the power grid stops supplying power. Generally, multiple 3V LED lamp beads are connected in parallel, and the characteristics are low voltage and high current. When the power grid is supplying power normally, the switch 110 controls the on and off of the main light source 180. After the switch 110 is closed, the switch constant current control circuit 200 provides a constant operating current for the main light source 180, and the main light source 180 is lit. At the same time, the power grid and switch monitoring circuit 310 recognizes that the power grid state is a normal power supply state, the switch state is a closed state, the output ACON signal is high, and the charge and discharge management circuit 320 is in a charging state, providing a charging current for the battery pack 130, charging the battery pack 130, and monitoring the voltage of the battery pack 130 to prevent overcharging and avoid damaging the battery. The emergency light source 190 has no light output. After the power grid stops supplying power, the main light source 180 has no light output, and the switch 110 also controls the on and off of the emergency light source 190. After the switch 110 is closed, the power grid and switch monitoring circuit 310 recognizes that the power grid state is in the power-off state, the switch state is in the closed state, the output EON signal is high, the charge-discharge management circuit 320 is in the discharge state, and the battery pack 130 supplies power to the emergency light source 190 through the current-limiting resistor 015. The emergency light source 190 is lit to provide emergency lighting. When the switch 110 is disconnected, regardless of whether the power grid state is in the normal power supply state or the power-off state, the switch constant current control circuit 200 stops working, the main light source 180 has no light output, the power grid and switch monitoring circuit 310 will recognize that the switch state is in the disconnected state, the output ACON signal and EON signal are both low, the charge-discharge management circuit 320 is in the closed state, neither charging nor discharging, and the emergency light source 190 has no light output.

[0045] but, Figure 1 The AC emergency lighting device shown has a disadvantage: the output power of the emergency light source 190 cannot be made large, generally only 2 to 5 watts, and the maximum is no more than about 10 watts. Basically, there is only one type of AC emergency lighting fixture, which is a bulb. The fundamental reason is that the emergency light source 190 is a plurality of 3V LED lamp beads connected in parallel, and the working characteristics are low voltage and high current. Generally, 10 to 40 3V LED lamp beads are connected in parallel. The working voltage at 3A is about 3.3V, and the working current is determined by the following formula: Working current I LED =(Battery voltage V BAT - Operating voltage V LED) / Resistance value of current limiting resistor 015 015 , the maximum voltage of the lithium battery is 4V, so the resistance value of the current limiting resistor 015 corresponding to the 3A working current is R 015 The value of 0.23Ω is 0.23Ω. In fact, this 0.23Ω includes multiple parasitic resistances: lithium battery internal resistance (about 25mΩ) + battery protection board internal resistance (about 25mΩ) + lithium battery silicone external lead internal resistance (about 50mΩ) + PCB wiring internal resistance (about 25mΩ) + ohmic contact internal resistance between lithium battery connection plug and PCB socket (about 10 to 100mΩ) + discharge power tube internal resistance (about 25mΩ). The total of these internal resistances is basically 0.2Ω. In other words, even if R 015 If the value is zero, the maximum operating current of the emergency light source 190 is only about 3A, and the maximum power is about 10W. For general lamps, in order to control costs, the operating current above 3A is too large, which is not good for safety. In addition, the power difference between the main light source 180 and the emergency light source 190 cannot be too large. The power ratio between the two is generally not more than 3. If the power of the emergency light source 190 is not large, then the power of the main light source 180 cannot be too large. This is also the fundamental reason why the current AC emergency lighting fixtures are limited to a single form such as bulbs.

[0046] The purpose of this embodiment is to make high-power AC emergency lighting fixtures. The output power of the emergency light source 190 is much greater than 10 watts, and the upper limit can be more than 100 watts. The types of AC emergency lighting fixtures are expanded from the current only bulb form to various forms, such as 1200mm high-power flat panel lights or 600mm×600mm flat panel lights, various ceiling lamps, various chandeliers, etc., and the AC emergency lighting fixtures are expanded from the current ordinary low-end household AC emergency lighting field to the mid-to-high-end high-power commercial AC emergency lighting field.

[0047] Figure 1 The emergency light source 190 in the embodiment uses multiple 3V LED lamp beads in parallel, with low voltage (3V) and high current (less than 3A). This embodiment adopts a different strategy: multiple 3V LED lamp beads are connected in series, and multiple lithium batteries are connected in series. For example, 5 3V LED lamp beads are connected in series, so that the operating voltage of the emergency light source 190 can be as high as 15V, and the current is high (still less than 3A). With this strategy, it is not difficult to achieve a power of 50 watts for the emergency light source 190.

[0048] Based on this, Figure 2 As shown, this embodiment provides a high-power AC emergency lighting control device, which includes: a rectifier bridge 120, a switch constant current control circuit 200, a transformer 160, a main light source 180, an emergency lighting controller 300, a series battery pack and an emergency light source 190.

[0049] The rectifier bridge 120 is connected to the power grid, and is used to convert the alternating current output from the power grid into direct current.

[0050] The switch constant current control circuit 200 is connected to the rectifier bridge 120 , and the primary coil of the transformer 160 and the main light source 180 are both connected to the switch constant current control circuit 200 . The switch constant current control circuit 200 is used to convert direct current into converted direct current that can power the main light source 180 .

[0051] The emergency lighting controller 300 is respectively connected to the secondary coil of the transformer 160, the series battery group and the emergency light source 190. The emergency lighting controller 300 is used to monitor the power grid state and the switch state of the switch 110 set on the connection line between the rectifier bridge 120 and the power grid, and charges the series battery group when the power grid state is normal power supply and the switch state is closed. When the power grid state is stopped and the switch state is closed, the series battery group is discharged to light up the emergency light source 190.

[0052] The series battery pack includes a plurality of batteries connected in series, the emergency light source 190 includes a plurality of LED lamp groups connected in series, each LED lamp group includes a plurality of LED lamp beads connected in parallel, and the LED lamp beads may be 3V LED lamp beads.

[0053] Specifically, Figure 2 As shown, the first input end of the rectifier bridge 120 is connected to the first output end of the power grid, and the second input end of the rectifier bridge 120 is connected to the second output end of the power grid. A switch 110 is provided on the connection line between the first input end of the rectifier bridge 120 and the first output end of the power grid.

[0054] A first input terminal of the switch constant current control circuit 200 is connected to a first output terminal of the rectifier bridge 120 , and a second input terminal of the switch constant current control circuit 200 is connected to a second output terminal of the rectifier bridge 120 .

[0055] A first end of the primary coil of the transformer 160 is connected to an output end of the switching constant current control circuit 200 .

[0056] A first end of the main light source 180 is connected to a second end of the primary coil of the transformer 160 , and a second end of the main light source 180 is connected to a first output end of the rectifier bridge 120 .

[0057] A first end of the secondary coil of the transformer 160 is connected to a first end of the main light source 180 .

[0058] A first input terminal of the emergency lighting controller 300 is connected to a second end of the secondary coil of the transformer 160 , and a second input terminal of the emergency lighting controller 300 is connected to a first end of the main light source 180 .

[0059] The first end of the series-connected battery group is connected to the first output end of the emergency lighting controller 300 , and the second end of the series-connected battery group is connected to the first end of the main light source 180 .

[0060] A first end of the emergency light source 190 is connected to a second output end of the emergency lighting controller 300 , and a second end of the emergency light source 190 is connected to a first end of the main light source 180 .

[0061] In this embodiment, the high-power AC emergency lighting control device further includes: a first filter capacitor 170 , and the first filter capacitor 170 is connected in parallel with the main light source 180 .

[0062] In this embodiment, the high-power AC emergency lighting control device also includes: a rectifier diode 150 and a second filter capacitor 140, the rectifier diode 150 is located between the secondary coil of the transformer 160 and the emergency lighting controller 300, the first end of the rectifier diode 150 is connected to the second end of the secondary coil of the transformer 160, the first input end of the emergency lighting controller 300 is connected to the second end of the rectifier diode 150, the first end of the second filter capacitor 140 is connected to the second end of the rectifier diode 150, and the second end of the second filter capacitor 140 is connected to the first end of the main light source 180.

[0063] In this embodiment, the high-power AC emergency lighting control device also includes: a current limiting resistor 015, which is located between the emergency lighting controller 300 and the emergency light source 190, and the first end of the current limiting resistor 015 is connected to the second output end of the emergency lighting controller 300, and the first end of the emergency light source 190 is connected to the second end of the current limiting resistor 015.

[0064] In this embodiment, the emergency lighting controller 300 includes a power grid and switch monitoring circuit 310 , a charge and discharge management circuit 320 , and a charge equalization circuit 330 .

[0065] The grid and switch monitoring circuit 310 is used to monitor the grid status and the switch status.

[0066] The charge and discharge management circuit 320 is respectively connected to the power grid and switch monitoring circuit 310 and the charge equalization circuit 330. The charge and discharge management circuit 320 is used to charge the series battery group through the charge equalization circuit 330 when the power grid state is normal power supply and the switch state is closed, and discharge the series battery group when the power grid state is stopped and the switch state is closed.

[0067] Among them, the first input end, the second input end, the first output end and the second output end of the emergency lighting controller 300 are the first input end, the second input end, the first output end and the second output end of the charge and discharge management circuit 320 .

[0068] The charge and discharge management circuit 320 has a built-in charging power tube and a discharging power tube, both of which are generally PMOS type. When the ACON signal from the power grid and switch monitoring circuit 310 is high, it means that the power grid is currently supplying power normally, and the switch 110 is also in a closed state. At this time, the charge and discharge management circuit 320 is in a charging state, the discharging power tube is turned off, and the charging power tube is turned on at the same time to charge the series battery group. When the EON signal from the power grid and switch monitoring circuit 310 is high, it means that the power grid is currently stopping supplying power, and the switch 110 is also in a closed state. At this time, the charge and discharge management circuit 320 is in a discharging state, the charging power tube is turned off, and the discharging power tube is turned on at the same time to discharge the series battery group and light up the emergency light source 190. When the ACON signal and the EON signal from the power grid and switch monitoring circuit 310 are both low, it means that the switch 110 is currently in a disconnected state. At this time, the charge and discharge management circuit 320 should turn off the charging power tube and the discharging power tube at the same time, and neither charge nor discharge.

[0069] The charge equalization circuit 330 is a passive charge equalization circuit.

[0070] from Figure 2 and Figure 1 It can be seen from the comparison that this embodiment maintains Figure 1 All the advantages of AC emergency lighting devices with parallel application of lithium batteries: high integration, low cost, complete protection measures, high reliability, high production yield, and fast charging.

[0071] Compared to Figure 1 The switch constant current control circuit 200 is placed on the top side. Figure 2 The middle switch constant current control circuit 200 is placed on the bottom side. The working principles of the top side architecture and the bottom side architecture are the same, but the bottom side architecture has a greater cost advantage.

[0072] The primary coil of the transformer 160 serves as the power inductor of the switch constant current control circuit 200, and the freewheeling diode 210 is the freewheeling diode of the power inductor. The secondary coil of the transformer 160 serves as a step-down coil. After passing through the rectifier diode 150 and the second filter capacitor 140, it provides a charging voltage for the four lithium batteries. In this embodiment, the series battery pack includes four lithium batteries, which are respectively recorded as the first battery 131, the second battery 132, the third battery 133 and the fourth battery 134. The sum of the voltages of the four fully charged lithium batteries is 16.8V, so the charging voltage provided by the secondary coil of the transformer 160 needs to be around 18V. It cannot be too low, otherwise it may not be fully charged, and it cannot be too high, otherwise the charging efficiency will be low. The turns ratio of the primary coil and the secondary coil of the transformer 160 is the ratio of the operating voltage of the main light source 180 to 18V, and the calculation formula is as follows: turns ratio N = (V HV -V OUT ) / 18V,V HV for Figure 2 The potential of the HV line, V OUT for Figure 2 The potential of the OUT line in the middle. Figure 1 , Figure 2 Although the charging voltage is higher, the charging current does not need to be increased (generally less than 1A). Figure 2 The total capacity of the 4 lithium batteries is Figure 1 The capacity of a single-cell lithium battery is 4 times that of a single-cell lithium battery. The charging current of the two is basically the same, but the time required to fully charge the two is also the same, which is one of the advantages of this embodiment.

[0073] The charging voltage (about 17.5V, minus the voltage drop of the rectifier diode 150) on the second filter capacitor 140 is sent to the charge and discharge management circuit 320 inside the emergency lighting controller 300, and then the charging current is controlled and output to the top node BAT of the four series-connected lithium batteries to charge the four lithium batteries. The charge and discharge management circuit 320 provides the most basic charging and discharging functions: including battery low-voltage and low-current charging function, constant current charging function, constant voltage charging function, overcharge protection function, charging over-temperature protection function, discharge over-current protection function, low-voltage protection function, etc.

[0074] How many 3V LED lamp beads are most suitable for series connection? How many lithium batteries are most suitable for series connection? Generally speaking, X 3V LED lamp beads are connected in series, corresponding to X lithium batteries. For example, 3 3V LED lamp beads are connected in series, the working voltage is 9V, corresponding to 3 lithium batteries in series, so the discharge efficiency corresponding to the maximum discharge power of the X / X configuration is (X*3) / (X*4)=75%, which is not very high. 3 represents the voltage of the LED, and 4 represents the voltage of the lithium battery.

[0075] This embodiment further improves the discharge efficiency. If 2 lithium batteries are used in series, the best configuration is 2 3V LED lamp beads in series. The discharge efficiency corresponding to the maximum discharge power of this 2 / 2 configuration is (2*3) / (2*4)=75%. If 3 lithium batteries are used in series, the best configuration is 3 3V LED lamp beads in series. The discharge efficiency corresponding to the maximum discharge power of this 3 / 3 configuration is (3*3) / (3*4)=75%. If 4 lithium batteries are used in series, the best configuration is 5 3V LED lamp beads in series. The discharge efficiency corresponding to the maximum discharge power of this 4 / 5 configuration is (5*3) / (4*4)=94%. If 5 lithium batteries are used in series, the best configuration is 6 3V LED lamp beads in series. The discharge efficiency corresponding to the maximum discharge power of this 5 / 6 configuration is (6*3) / (5*4)=90%. If 6 lithium batteries are used in series, the best configuration is 7 3V LED lamp beads in series. The discharge efficiency corresponding to the maximum discharge power of this 6 / 7 configuration is (7*3) / (6*4)=87.5%. If 7 lithium batteries are connected in series, the best configuration is 9 3V LED lamp beads in series. The discharge efficiency corresponding to the maximum discharge power of this 7 / 9 configuration is (9*3) / (7*4)=96%. If 8 lithium batteries are connected in series, the best configuration is 10 3V LED lamp beads in series. The discharge efficiency corresponding to the maximum discharge power of this 8 / 10 configuration is (10*3) / (8*4)=94%.

[0076] It can be seen that the 7 / 9 configuration has the highest discharge efficiency, up to 96%, followed by the 4 / 5 configuration and the 8 / 10 configuration, with efficiencies also as high as 94%. The 7 / 9 configuration is suitable for discharge powers above 40 watts. For example, if the discharge current is 2A, the corresponding emergency light source 190 power is as high as about 60 watts. For emergency light sources 190 discharge powers between 15 watts and 40 watts, the 4 / 5 configuration is a better choice. After all, the cost of 4 lithium batteries is much lower than that of 7 lithium batteries. Therefore, it is preferred that the number of batteries in series is 4 and the number of LED light groups in series is 5.

[0077] Figure 2 This is a schematic diagram of the 4 / 5 configuration. Figure 2 The 4 lithium batteries are connected in series, and the emergency light source 190 is first connected in parallel by N (N>5) 3V LED lamp beads, and then connected in series 5 times. The total number of LED lamp beads is 5*N. Figure 3 It should be noted that the application of 2 lithium batteries in series, 3 lithium batteries in series, or 4 or more lithium batteries in series can also be easily expanded, which will not be described in detail here.

[0078] When multiple lithium batteries are connected in series, a balancing circuit is indispensable. Generally speaking, the balancing circuit includes a charging balancing circuit and a discharging balancing circuit. At present, the industry has reached a consensus on the charging balancing circuit, but has not yet reached a complete consensus on the discharging balancing circuit. The charging balancing circuit is divided into passive charging balancing (or passive charging balancing) and active charging balancing (or active charging balancing). The former has a simple structure, low cost, and good reliability, but lower efficiency and a small balancing current; the latter has a complex structure, high cost, and the reliability is not as good as the former, but the efficiency is higher than the former, and the balancing current can be made relatively large. Generally speaking, the discharging balancing circuit only has an active discharging balancing circuit, which has a complex structure, high cost, and a relatively large balancing current. It is usually used in high-performance application scenarios.

[0079] This embodiment is for ordinary consumer scenarios and is cost-sensitive. Therefore, only a low-cost and highly reliable passive charging equalization circuit is used, and there is no discharge equalization circuit. Figure 4 3 is a circuit diagram of a charge balancing circuit 330, including a first error amplifier 331, a first PMOS tube 332, a second error amplifier 333, a second PMOS tube 334, a third error amplifier 335, a third PMOS tube 336, a fourth error amplifier 337 and a fourth PMOS tube 338. During the charging process, when the voltage of any lithium battery reaches 4.2V, its corresponding error amplifier (331, 333, 335, 337) will turn on the corresponding PMOS tube (332, 334, 336, 338) to bypass the charging current to the negative electrode of the lithium battery to prevent the lithium battery from being overcharged. This charging current bypass is called passive charge balancing. After any lithium battery is fully charged, it does not affect the continued charging of other lithium batteries that are not fully charged. The PMOS tube bears the corresponding passive balancing power consumption. This charge balancing circuit 330 plays two roles: one is charge balancing, and the other is to prevent the lithium battery from being overcharged.

[0080] Example 2

[0081] This embodiment provides a high-power AC emergency lighting fixture, which includes: a shell and a high-power AC emergency lighting control device located inside the shell. The high-power AC emergency lighting control device adopts the high-power AC emergency lighting control device described in Example 1.

[0082] Example 3

[0083] This embodiment provides a control method for the high-power AC emergency lighting control device described in Embodiment 1, and the control method for the high-power AC emergency lighting control device includes:

[0084] (1) Monitor the grid status and switch status.

[0085] (2) When the grid is in normal power supply state and the switch state is closed, the series-connected battery pack is charged.

[0086] (3) When the power grid stops supplying power and the switch is closed, the series-connected battery pack is discharged to light up the emergency light source.

[0087] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A high-power AC emergency lighting control device, characterized in that: The high-power AC emergency lighting control device comprises: a rectifier bridge, a switch constant current control circuit, a transformer, a main light source, an emergency lighting controller, a series battery pack and an emergency light source; The rectifier bridge is connected to the power grid; the rectifier bridge is used to convert the AC power output from the power grid into DC power; The switch constant current control circuit is connected to the rectifier bridge, and the primary coil of the transformer and the main light source are both connected to the switch constant current control circuit; the switch constant current control circuit is used to convert the direct current into converted direct current that can power the main light source; The emergency lighting controller is connected to the secondary coil of the transformer, the series battery group and the emergency light source respectively; the emergency lighting controller is used to monitor the state of the power grid and the switch state of the switch set on the connection line between the rectifier bridge and the power grid, and when the power grid state is normal power supply and the switch state is closed, the series battery group is charged, and when the power grid state is stopped and the switch state is closed, the series battery group is discharged to light up the emergency light source; The series battery pack includes a plurality of batteries connected in series; the emergency light source includes a plurality of LED light groups connected in series, and each LED light group includes a plurality of LED lamp beads connected in parallel.

2. The high-power AC emergency lighting control device according to claim 1, characterized in that: The first input end of the rectifier bridge is connected to the first output end of the power grid, and the second input end of the rectifier bridge is connected to the second output end of the power grid; The first input end of the switch constant current control circuit is connected to the first output end of the rectifier bridge, and the second input end of the switch constant current control circuit is connected to the second output end of the rectifier bridge; The first end of the primary coil of the transformer is connected to the output end of the switch constant current control circuit; The first end of the main light source is connected to the second end of the primary coil of the transformer, and the second end of the main light source is connected to the first output end of the rectifier bridge; A first end of the secondary coil of the transformer is connected to a first end of the main light source; The first input terminal of the emergency lighting controller is connected to the second end of the secondary coil of the transformer, and the second input terminal of the emergency lighting controller is connected to the first end of the main light source; The first end of the series-connected battery group is connected to the first output end of the emergency lighting controller, and the second end of the series-connected battery group is connected to the first end of the main light source; The first end of the emergency light source is connected to the second output end of the emergency lighting controller, and the second end of the emergency light source is connected to the first end of the main light source.

3. The high-power AC emergency lighting control device according to claim 1, characterized in that: The high-power AC emergency lighting control device also includes: a first filter capacitor, which is connected in parallel with the main light source.

4. The high-power AC emergency lighting control device according to claim 2, characterized in that: The high-power AC emergency lighting control device also includes: a rectifier diode and a second filter capacitor, the rectifier diode is located between the secondary coil of the transformer and the emergency lighting controller, the first end of the rectifier diode is connected to the second end of the secondary coil of the transformer, and the first input end of the emergency lighting controller is connected to the second end of the rectifier diode; the first end of the second filter capacitor is connected to the second end of the rectifier diode, and the second end of the second filter capacitor is connected to the first end of the main light source.

5. The high-power AC emergency lighting control device according to claim 2, characterized in that: The high-power AC emergency lighting control device also includes: a current limiting resistor, which is located between the emergency lighting controller and the emergency light source, wherein the first end of the current limiting resistor is connected to the second output end of the emergency lighting controller, and the first end of the emergency light source is connected to the second end of the current limiting resistor.

6. The high-power AC emergency lighting control device according to claim 1, characterized in that: The emergency lighting controller includes a power grid and switch monitoring circuit, a charge and discharge management circuit, and a charge equalization circuit; The grid and switch monitoring circuit is used to monitor the grid status and switch status; The charge and discharge management circuit is connected to the power grid and the switch monitoring circuit and the charge equalization circuit respectively; the charge and discharge management circuit is used to charge the series battery group through the charge equalization circuit when the power grid state is normal power supply and the switch state is closed, and to discharge the series battery group when the power grid state is stopped power supply and the switch state is closed.

7. The high-power AC emergency lighting control device according to claim 6, characterized in that: The charging equalization circuit adopts a passive charging equalization circuit.

8. The high-power AC emergency lighting control device according to claim 1, characterized in that: The number of batteries connected in series is 4, and the number of LED light groups connected in series is 5.

9. A high-power AC emergency lighting fixture, characterized in that: The high-power AC emergency lighting fixture comprises: a shell and a high-power AC emergency lighting control device located inside the shell. The high-power AC emergency lighting control device adopts the high-power AC emergency lighting control device according to any one of claims 1-8.

10. A control method for the high-power AC emergency lighting control device according to any one of claims 1 to 8, characterized in that: The control method of the high-power AC emergency lighting control device comprises: Monitor the grid status and switch status; When the power grid is in a normal power supply state and the switch state is closed, charging the series-connected battery pack; When the power grid is in the state of power failure and the switch is in the state of closing, the series-connected battery pack is discharged to light the emergency light source.

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