CN113453398A

CN113453398A - Control method of LED emergency lamp

Info

Publication number: CN113453398A
Application number: CN202010231615.0A
Authority: CN
Inventors: 周军; 蒲纪忠; 甘彩英
Original assignee: CH Lighting Technology Co Ltd
Current assignee: CH Lighting Technology Co Ltd
Priority date: 2020-03-27
Filing date: 2020-03-27
Publication date: 2021-09-28

Abstract

The application provides a control method of an LED emergency lamp, wherein the LED emergency lamp comprises an LED and a driving circuit, the driving circuit comprises an emergency branch circuit, a commercial power branch circuit and a control module, the commercial power branch circuit comprises a charging circuit and an energy storage module, the energy storage module is provided with a signal input end coupled with the charging circuit to detect a charging signal, an external power supply supplies power to the LED through the commercial power branch circuit and charges the energy storage module through the charging circuit during power-on, the energy storage supplies power to the LED during power-off, the control module is provided with a signal input end used for detecting the commercial power signal, and the control method comprises the following steps: when the power is cut off, the control module firstly cuts off the commercial power branch and then cuts off the charging circuit; when the LED is powered on, the control module firstly switches on the charging circuit to enable the energy storage module to stop supplying power to the LED, and then the control module releases the switching-off control of the commercial power branch. The control method of the LED emergency lamp can effectively avoid the situation that two paths supply power to the LED at the same time, and prolongs the service life of the lamp.

Description

Control method of LED emergency lamp

Technical Field

The application relates to the technical field of lighting, in particular to a control method of an LED emergency lamp.

Background

The traditional LED emergency lamp lights the LED through the emergency branch when power is off, so as to provide emergency lighting; when the call comes, the emergency branch is disconnected, and the LED is turned off. Through increasing the commercial power branch road in the drive circuit of LED emergency light, when the incoming telegram, the commercial power can light LED emergency light via the commercial power branch road to make traditional LED emergency light possess daily illumination function.

However, for the LED emergency lamp with the daily lighting function, at the moment of the incoming call, the situation that the emergency branch and the commercial power branch supply power to the LED at the same time may occur, and the two paths supply power to the LED at the same time is not favorable for maintaining the service life of the lamp, or even has the risk of burning out the lamp.

Disclosure of Invention

The application provides a LED emergency light, can effectively avoid appearing the condition that the double-circuit supplied power to LED simultaneously, extension lamps and lanterns life.

Control method of LED emergency light, LED emergency light includes LED and drive circuit, drive circuit includes emergent branch road, commercial power branch road and control module, the commercial power branch road includes charging circuit and energy storage module, and energy storage module has the signal input part who couples charging circuit detection charge signal, and external power supplies via the commercial power branch road to LED power supply and via charging circuit to energy storage module charging energy storage during the circular telegram, and the energy storage supplies power to LED during the outage, control module has the signal input part who detects commercial power signal, its characterized in that, control method includes following step:

when the power is cut off, the control module firstly cuts off the commercial power branch and then cuts off the charging circuit;

when the power supply is powered on, the control module firstly conducts the charging circuit to enable the energy storage module to stop supplying power to the LED, and then the control on the disconnection of the commercial power branch is released.

Optionally, the utility power branch road includes second rectification filter module, constant voltage module that couple in proper order and is controlled by control module's fourth switch, energy storage module's signal input part is coupled the output of fourth switch, during the outage control module cuts off the fourth switch, during the circular telegram control module switches on the fourth switch.

Optionally, the utility power branch includes a second rectification filter module and a constant current module that are coupled in sequence, and shares the second rectification filter module with the emergency branch.

Optionally, a signal input end of the control module is coupled to an output end of the constant voltage module.

Optionally, the driving circuit includes a third switch coupled to the control module, if the third switch is closed, the control module sequentially disconnects the commercial power branch and the charging circuit, and if the third switch is disconnected, the control module firstly turns on the charging circuit and then releases the turn-off control of the commercial power branch.

Optionally, the energy storage module has a fifth switch for controlling charging and discharging of the energy storage module, if the fifth switch is turned off, the control module sequentially turns off the commercial power branch and closes the charging circuit, and if the fifth switch is turned on, the control module firstly turns on the charging circuit and then releases the turn-off control of the commercial power branch.

Optionally, the LED has two power connection ends for emergency and is the first end and the second end respectively, the driving circuit further includes a signal branch, the signal branch is coupled with the first end, the commercial power branch and the emergency branch are coupled with the second end, if the commercial power branch does not receive the external driving signal through the signal branch, the commercial power branch is disconnected, and if the commercial power branch receives the external driving signal through the signal branch, the turn-off control on the commercial power branch is released.

Optionally, the energy storage module includes an energy storage element, and if the control module detects that the output voltage of the energy storage element is lower than a set value, the energy storage module enters a sleep state.

Optionally, if the control module detects a mains signal, the sleep state is released.

Optionally, the control module periodically turns off the mains supply branch and the charging circuit in sequence, so that the energy storage module supplies power to the LEDs.

The application provides an LED emergency light can effectively avoid appearing the condition that the double-circuit supplied power to the LED simultaneously, extension lamps and lanterns life.

Drawings

FIG. 1a is a schematic diagram of a prior art LED emergency light;

FIG. 1b is a schematic diagram of an embodiment of an emergency branch according to the present application;

FIG. 2a is a schematic diagram of an embodiment of an LED emergency light according to the present application;

FIG. 2b is a schematic diagram of an embodiment of an LED lamp according to the present application;

FIG. 3 is a schematic diagram of an embodiment of an illumination system of the present application;

FIG. 4 is a schematic diagram of an embodiment of an illumination system of the present application;

FIG. 5 is a schematic diagram of an embodiment of an LED emergency light of the present application;

FIG. 6a is a schematic diagram of an embodiment of an LED emergency light of the present application;

FIG. 6b is a schematic diagram of an embodiment of an LED emergency light of the present application;

FIG. 7 is a schematic diagram of an embodiment of an LED emergency light of the present application;

FIG. 8 is a schematic diagram of an embodiment of an LED emergency light of the present application;

FIG. 9 is a schematic diagram of an embodiment of an LED emergency light of the present application;

FIG. 10 is a schematic diagram of an embodiment of an illumination system of the present application;

FIG. 11 is a circuit diagram of a second rectifying and filtering module in the LED emergency lamp of the present application;

fig. 12 is a circuit diagram from the first switch to the constant current module in the LED emergency lamp of the present application;

fig. 13 is a circuit diagram from the control module to the constant current module in the LED emergency lamp of the present application;

FIG. 14 is a circuit diagram of a constant voltage module in the LED emergency lamp of the present application;

FIG. 15 is a circuit diagram of a constant current module in the LED emergency lamp of the present application;

FIG. 16 is a circuit diagram of an energy storage module in the LED emergency light of the present application;

FIG. 17 is a circuit diagram of a boost module in the LED emergency light of the present application;

FIG. 18 is a circuit diagram of a control module in the LED emergency light of the present application;

FIG. 19 is a schematic perspective view of an LED emergency light of the present application;

FIG. 20 is a partial exploded view of the LED emergency light of the present application;

FIG. 21 is a schematic view of the internal structure of the LED emergency light of the present application;

FIG. 22 is a partial exploded view of the LED emergency light of the present application;

FIG. 23 is a flow chart of a method for controlling an LED emergency light according to the present application;

fig. 24 is a circuit diagram of a constant current module according to an embodiment of the LED emergency lamp of the present application.

The reference numerals are explained below:

1. a pipe body; 11. a bottom case; 111. a first card slot; 112. a second card slot; 113. an installation chamber; 114. heat dissipation ribs; 12. a light-transmitting cover 121 and a clamping tongue; 13. an installation section; 131. positioning a groove; 132. a latch; 2. an end cap; 21. a pin; 3. an end cap; 31. a pin; 4. an LED light bar; 5. a circuit board; 51. a fifth switch; 52. an indicator light; 53. and a third switch.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1a, in a conventional LED emergency lamp, a driving circuit includes a mains branch and an emergency branch having an energy storage module, an external power supply supplies power to an LED via the mains branch when the emergency branch is powered on, and the energy storage module supplies power to the LED when the emergency branch is powered off.

Referring to fig. 1b, most emergency branches further include a charging circuit, and when the emergency branch is powered on, the external power source charges and stores energy for the energy storage module through the charging circuit. The power-on or power-off means whether the LED emergency lamp is connected with an external power supply, and the external power supply can be a direct current power supply or an alternating current power supply.

Some LED emergency lamps (such as straight tube lamps) have two electrical terminals, and the commercial power branch is coupled with two electrical terminals simultaneously, when one of them electrical terminal access power, if operating personnel touches another electrical terminal, there is the risk of electrocution.

In order to solve the above problem, referring to fig. 2a, an embodiment of the present application provides an LED emergency lamp, which includes an LED and a driving circuit, where the driving circuit includes a signal branch, a mains branch and an emergency branch having an energy storage module, an external power supply supplies power to the LED via the mains branch when the driving circuit is powered on, and the energy storage module supplies power to the LED when the driving circuit is powered off, the LED emergency lamp has two connection terminals which are a first terminal and a second terminal respectively, and the signal branch is coupled to the first terminal and is used for externally transmitting a driving signal to control the connection and disconnection of the mains branch; the utility model discloses a LED power supply, including LED, commercial power branch road, first end, second end, and the commercial power branch road is coupled with the second end for transmission electric power supplies power to the LED, and when only two connect the equal circular telegram of end, the commercial power branch road just can lead to the LED power supply, avoids the risk of electrocution.

In this embodiment, the power for operating the LED lamp is from the second end, and the first end can be regarded as a control end, and whether the mains branch leads to the LED power supply is controlled by transmitting the driving signal.

Some LED lamps with two ends powered do not need to have an emergency function, and in order to simplify the circuit, referring to fig. 2b, an embodiment of the present application further provides an LED lamp, which includes an LED and a driving circuit, where the LED lamp has two power connection ends, which are a first end and a second end, respectively, and the driving circuit includes a mains supply branch and a signal branch, where the signal branch is coupled with the first end and is used to transmit a driving signal to control the on/off of the mains supply branch; the mains supply branch is coupled with the second end and used for transmitting power to supply power to the LED, and the mains supply branch can be conducted to the LED for supplying power only when the two power connection ends are electrified.

In one embodiment, referring to fig. 5, the utility power branch includes a second rectification filter module and a constant current module which are coupled in sequence, and the second end is connected with the alternating current, rectified and filtered by the second rectification filter module, converted into the direct current, and then supplies power to the LED by the constant current module. The power supply to the LED by the constant current module accords with the characteristic that the brightness of the LED is influenced by current. Conventional techniques may be employed for the constant current module itself, and this application also provides an improved approach in some embodiments below.

In one embodiment, referring to fig. 6a, the constant current module includes a freewheeling unit coupled between the second rectifying and smoothing module and the LED, a switching element, and a first controller for controlling the switching element to be turned on or off, and a first control element is coupled between the second rectifying and smoothing module and a power supply terminal of the first controller. When the first control element is disconnected without receiving an external driving signal, the second rectifying and filtering module cannot supply power to the first controller, so that the switching element is disconnected, the constant current module cannot normally work, namely cannot supply power to the LED, and otherwise, when the first control element is switched on after receiving the external driving signal, the constant current module can normally work and can supply power to the LED.

The constant current module further comprises a sampling unit, the sampling unit collects current signals from the output end of the switch element and feeds the current signals back to the first controller, and then the switch element is controlled to be switched on or switched off, and the switch element is generally an MOS (metal oxide semiconductor) tube.

In one embodiment, referring to fig. 6b, the signal branch includes a first rectifying and filtering unit and a first optocoupler which are coupled in sequence, the first end is connected with an ac power, and the ac power can be converted into a dc power by the first rectifying and filtering module, and then the commercial power branch is controlled. The first optical coupler is utilized to realize the isolation effect, the grounding resistance at two ends of the lamp tube is increased, and electric leakage is avoided.

In one embodiment, the first terminal is connected to the dc power and coupled to the main power branch, which eliminates the aforementioned first rectifying and filtering module.

In one embodiment, referring to fig. 5, the emergency branch includes a second rectifying and filtering module, a constant voltage module and an energy storage module, which are coupled in sequence. The second rectification filter module and the constant voltage module form a charging circuit, and an external power supply supplies power and stores energy to the energy storage module sequentially through the second rectification filter module and the constant voltage module. If the external power supply is direct current, the energy storage module can be directly charged without arranging a second rectifying and filtering module. The energy storage module generally comprises energy storage elements such as a battery pack and the like, and the constant voltage module is more favorable for charge and discharge management.

Referring to fig. 5, in order to simplify the circuit, in one embodiment, the utility power branch and the emergency branch share the second rectifying and filtering module, that is, the output end of the second rectifying and filtering module supplies power to the constant voltage module and the constant current module at the same time.

In one embodiment, the energy storage module has a signal input end for detecting a mains supply signal, and supplies power to the LED when the power supply is off, and stops supplying power to the LED when the power supply is on. In one embodiment, the signal input terminal of the energy storage module is coupled to the charging circuit, and obviously, may also be coupled to the mains branch.

The LED lamp comprises both a mechanical construction part and an electrical circuit part, and the mechanical construction itself does not affect the implementation of the technical solution of the present application, although the present application also provides an improved way hereinafter.

Based on the above-mentioned driving circuit and LED emergency light, an embodiment of the present application further provides a power supply system with an LED emergency light, and in this application, whether the drawings refer to any one of the driving circuit, the LED emergency light, or the power supply system, the contents shown in the drawings and the corresponding text descriptions can be regarded as including the disclosures of the corresponding parts of the other two.

The power supply system with the LED emergency lamp in the embodiment comprises the LED emergency lamp and an alternating current line which is coupled with each electric connection end of the LED emergency lamp.

Referring to fig. 3, in one embodiment, a first switch is mounted on the ac line coupled to the first terminal for generating the driving signal. The first switch adopts a mode of field triggering or remote control combination, and the first switch can be arranged on an indoor wall body, a lamp holder or a related electric system.

The on-off state of first switch has also decided whether drive signal has or not, and for example first switch sets up to normally open the mode, when needing to use LED emergency light, sends a drive signal to the commercial power branch road through triggering first switch for the commercial power branch road switches on, because the second end is through the commercial power branch road power supply to LED all the time, in case it switches on, can light LED.

Referring to fig. 12, the first switch is coupled to one of the connection pins at the first end, the connection pin may also be connected in series to fuse a fuse F3, a voltage dependent resistor RV2 may also be connected between the two connection pins at the first end, the first rectifying and filtering module employs a bridge rectifier BD2, filtering employs a capacitor C26 and a resistor R36, the rectified current is connected to the primary side of the first optocoupler U4, the primary side of the first optocoupler is also connected to a resistor R35, a resistor R35', a capacitor C28, and the secondary side of the first optocoupler U4 is connected to the constant current module.

Because the first end is only used for control, the filter capacitor in the first rectifying and filtering module can be realized by a conventional capacitor C26 instead of an electrolytic capacitor, so that the cost is saved, the service life is prolonged, and the potential safety hazard is reduced.

Referring to fig. 4, in an embodiment, a first switch is mounted on the ac line coupled to the first terminal for generating a driving signal; and a second switch is arranged on the alternating current circuit coupled with the second end and used for cutting off the commercial power to switch the driving circuit to supply power to the LED by the energy storage module.

The break-make of second switch can directly influence the power supply of commercial power branch road, if need real-time power supply, can be the normally closed state with the second switch, utilizes the emergent branch road of second switch still initiative test, and the second end of breaking off is equivalent to and passes through the commercial power branch road power supply to switch energy storage module and directly supply power to LED, whether can normal use with the emergent branch road of preliminary detection.

In one embodiment, the second switch is a normally closed switch. Can be installed in indoor wall, lamp holder or relative electric system.

Referring to fig. 11, the second switch is coupled to one of the connection pins of the second end, each connection pin may further be connected in series with a fuse F1 and a fuse F2, a voltage dependent resistor RV1 may also be connected between the two connection pins of the second end, and then the second switch enters the first EMI filter circuit, specifically related components include an inductor LM1, an inductor LM2, a capacitor CX1, a capacitor CX2, a resistor R1, a resistor R2, a resistor R2', and then enters the bridge stack BD1 for rectification, and then enters the second EMI filter circuit, specifically related components include an inductor L1, a resistor R3, a capacitor C1, a capacitor C2, and power is supplied to the constant current module and the constant voltage module after filtering.

In one embodiment, the constant current module includes a first transformer coupled to the first controller, a first side of the first transformer is coupled to the second rectifier and filter module, and a first side of the first transformer is controlled by the first controller. In one embodiment, the first controller is powered by the second rectifying and filtering module. In one embodiment, the first controller is further fed by the secondary side of the first transformer. In one embodiment, a first control element is coupled between the second rectifying and filtering module and the power supply terminal of the first controller, and the first control element is controlled by a driving signal from the first terminal.

Referring to fig. 15, the constant current module includes a first transformer T2, a MOS transistor Q2 is connected in series to the primary side of the first transformer T2, and the gate of the MOS transistor Q2 is connected to and controlled by a first controller U2. For example, the first controller U2 may employ an MT7933 chip.

The power supply end of the first controller U2 is a pin 5, and the second rectification filter module sequentially passes through a resistor R34, a resistor R33, a resistor R33' and a triode Q3 to supply power to the pin 5. The secondary side of the first transformer T2 feeds back to pin 5 via diode D7, resistor 30 and transistor Q3.

The first controller U2 directly supplies power through the second rectifying and filtering module at the initial stage of power-on, and when the first transformer T2 stably works, the feedback power supply of the secondary side is utilized, so that the stability of operation and energy supply can be further ensured.

The transistor Q3 can be regarded as a first control element, and whether it is conducting or not is also related to the driving signal from the first terminal, i.e. the signal of the first optocoupler.

After power-on, due to the energy storage absorbed by the electrolytic capacitor CD3, the voltage rise on the left side (according to the position in the figure) of the resistor R31 is slightly delayed, and the conduction of the MOS transistor Q4 is equivalent to grounding of the base of the transistor Q3, that is, the transistor Q3 cannot supply power to the first controller U2, and is equivalent to the turn-off of the constant current module, and cannot work.

If the first switch is triggered, the first optical coupler inputs a low level to the gate of the MOS transistor Q4, so that the MOS transistor Q4 is turned off, which means that the base voltage of the transistor Q3 rises to turn on the power supply to the first controller U2, so that the constant current module operates normally to supply power to the LED.

In one embodiment, the constant voltage module includes a second transformer, a primary side of the second transformer is coupled to the second rectifying and filtering module, and a primary side of the second transformer is controlled by a second controller. In one embodiment, the second controller is powered by the second rectifying and filtering module. In one embodiment, the second controller is also fed by the secondary side feedback of the second transformer.

Referring to fig. 14, the constant voltage module includes a second transformer T1, a MOS transistor Q1 is connected in series to the primary side of the second transformer, and the gate of the MOS transistor Q1 is connected to and controlled by a second controller U1. For example, the second controller U1 may employ an MT7990 chip.

The power supply end of the second controller U1 is a pin 3, and the second rectification filter module supplies power to the pin 3 through a resistor R4, a resistor R5 and a resistor R5' in sequence. The secondary side of the second transformer T1 feeds back to the pin 3 via the diode D2 and the resistor 12.

The second controller U1 directly supplies power through the second rectifying and filtering module at the initial stage of power-on, and when the second transformer T1 stably works, the secondary side feedback is used for supplying power, so that the stability of operation and energy supply can be further ensured.

Referring to fig. 6a, in an embodiment, the driving circuit further includes a control module coupled to the mains branch for obtaining or releasing the control for turning off the mains branch. In one embodiment, the control module is coupled to the constant current module in the utility power branch for obtaining or releasing the turn-off control of the constant current module.

The control module controls the commercial power branch circuit through the constant current module, the control is mainly to control the constant current module in priority to the driving signal or release the priority, when the turn-off control is obtained, the driving signal can be shielded, namely the first switch does not work any more, the turn-off control is released, and the first switch can normally work to perform the on and off operation.

In one embodiment, referring to fig. 6b, the control module is coupled to the constant current module through a second optocoupler. In one embodiment, the turn-off control is prior to the control of the constant current module by the driving signal, namely prior to the on-off control of the constant current module by the first switch.

Referring to fig. 13, the control module is connected to the primary side of the second optocoupler U3 through a resistor R37, the secondary side of the second optocoupler U3 is connected to the constant current module, and when the second optocoupler U3 is triggered by the control module, a low level signal can be input to the constant current module, and in combination with the above, the low level signal is connected to the base of the triode Q3, that is, the triode Q3 cannot supply power to the first controller U2, which is equivalent to that the control module obtains the turn-off control of the constant current module, that is, the constant current module is turned off, and no matter whether the first optocoupler has a signal or not.

When the second optocoupler U3 does not have a low level signal input, i.e. the off control is released, the conduction of the transistor Q3 is still related to the conduction of the MOS transistor Q4 and the first optocoupler signal as described above.

Referring to fig. 24, the second optocoupler U3 is coupled to the power supply terminal of the first controller U2 through a MOS transistor Q8. The gate of the MOS transistor Q8 is coupled to the secondary side of the second optocoupler U3, the drain of the MOS transistor Q8 is grounded, and the source of the MOS transistor Q8 is coupled to the base of the transistor Q3.

When the control module sends low level to the primary side of second opto-coupler U3, the secondary side of second opto-coupler U3 is cut off, then MOS pipe Q8's grid voltage changes, then be equivalent to second opto-coupler U3 send high level to MOS pipe Q8 grid, then MOS pipe Q8 switches on and makes triode Q3's base ground connection, triode Q3 can't supply power for first controller U2 promptly, be equivalent to the turn-off control that control module obtained constant current module has shut off constant current module promptly, and no matter whether first opto-coupler has the no signal or not.

Thus, weak leakage current is avoided when the control module is in dormancy. The leakage current may be mistaken for a high level output to trigger the second optocoupler U3, which may turn off the constant current module. After an MOS (metal oxide semiconductor) tube is connected between the second optocoupler U3 and the base electrode of the triode Q3, the control module is enabled to output a low level and to consider the low level to send a signal, and thus even if the control module has leakage current, the output high level cannot influence the normal work of the constant current module.

In one embodiment, referring to fig. 6b, the control module is further coupled with a third switch, and is configured to instruct the control module to turn off the power supply from the utility power branch to the LED and turn on the emergency branch to supply power to the LED.

The third switch can also be used as a test switch for detecting whether the emergency branch can normally respond, the control module switches off the commercial power branch in a mode of switching off the constant current module through the second optical coupler, and the control module can also send a signal to the emergency branch to supply power to the LED due to the fact that commercial power is not powered off actually.

In one embodiment, the emergency branch is provided with a control element (such as a switch) for controlling the charging circuit to charge the energy storage module, the control element is controlled by the control module, when the control module disconnects the emergency branch through the control element, the charging circuit cannot charge the energy storage module, and the energy storage module supplies power to the LED.

In one embodiment, the third switch is a normally open switch, so that the normal operation of the LED emergency lamp is not affected. In one embodiment, the third switch is mounted on the lamp tube for easy control and field operation.

Referring to fig. 18, the control module may be a single chip microcomputer U6, the third switch is connected to a pin 4 of the single chip microcomputer U6, and after the third switch is triggered, the single chip microcomputer U6 sends a signal to the second optical coupler through a pin 3 to turn off the constant current module.

In order to avoid the phenomenon that the emergency branch and the mains supply branch supply power to the LED at the same time (namely, the common phenomenon), the on-off of the constant current module and the on-off of the emergency branch supply power to the LED can be arranged in sequence, namely, the output time in working is different. The commercial power branch and the emergency branch share the second rectifying and filtering module in the foregoing embodiment, which can ensure the consistency of the time difference.

In one embodiment, when the mains supply branch is required to be used for supplying power, the control module firstly closes the emergency branch to supply power to the LED, and then releases the turn-off control of the constant current module; when the emergency branch is needed to supply power, the control module firstly turns off the constant current module to supply power to the LED and obtains turn-off control of the constant current module, and then turns on the emergency branch to supply power to the LED.

The switching-off control of the constant current module is released, which means that the first switch can be normally switched in to control the switching-on of the constant current module, and if the first switch is not in a time sequence control state, once the first switch is in a trigger state, the emergency branch and the commercial power branch can supply power to the LED at the same time, so that the emergency branch needs to be switched off to supply power to the LED. And similarly, the constant current module is switched off first when the emergency branch is switched to supply power.

Referring to fig. 7, in one embodiment, the energy storage module includes:

the energy storage element is coupled with the constant voltage module to supply power and store energy through the constant voltage module;

the boosting module is coupled to the energy storage element and used for boosting the output of the energy storage element and supplying power to the LED;

and the switching module detects the output voltage of the constant voltage module to control the boosting module to work.

In one embodiment, a fourth switch is coupled between the constant voltage module and the energy storage module, and the control module actively controls the on/off of the charging circuit in the emergency branch circuit by controlling the on/off of the fourth switch. In one embodiment, the fourth switch is normally closed. The fourth switch can adopt an MOS tube or other circuit devices capable of realizing on-off control. In one embodiment, the energy storage element may be a capacitor, a battery pack, or other circuit devices capable of storing energy. For example, the battery pack mode is adopted, and the charging and discharging management module and the temperature monitoring management module of the battery pack can also be configured by using the conventional technology.

Referring to fig. 16 and 18, a pin 2 of a single chip microcomputer U6 in the control module is a signal output end, and the on/off of a triode Q5 can be controlled by a resistor R49, the fourth switch adopts a MOS transistor Q6, a gate of the MOS transistor Q6 is connected to a collector of a triode Q5, the single chip microcomputer U6 controls the on/off of a MOS transistor Q6 by whether the triode Q5 is turned on or not, the triode Q5 is turned on in a normal state, the gate of the MOS transistor Q6 is at a low potential, that is, the MOS transistor Q6 is also turned on, and when the MOS transistor Q6 needs to be turned off, the single chip microcomputer U6 turns off the triode Q5, so that the gate potential of the MOS transistor Q6 rises, that the MOS transistor Q6 is turned off.

The energy storage element adopts a battery pack BAT1, and after the MOS tube Q6 is conducted, the battery pack BAT1 can be charged. When the battery pack BAT1 discharges, the battery pack BAT1 is input into the boost module, and supplies power to the LED after being boosted.

Referring to fig. 8, in an embodiment, a protection module is further coupled between the output end of the fourth switch and the energy storage element, and an indication module for displaying information during charging is further coupled to the output end of the fourth switch.

In one embodiment, the display information may be at least one of an acoustic signal and an optical signal. In one embodiment, the indication module comprises a light emitting diode. The indicating module is not directly connected with the energy storage element in parallel, so that extra consumption of the energy storage element during discharging can be avoided. In one embodiment, the protection module includes at least one shunt resistor, a series diode for preventing reverse current, and a series fuse. In one embodiment, the indication module is coupled to an anode of the diode, and a cathode of the diode is coupled to the energy storage element.

Referring to fig. 9, in an embodiment, the protection module and the boost module are coupled to the energy storage element via a fifth switch.

In one embodiment, the fifth switch is installed on the lamp tube and serves as a charging on-off switch of the energy storage element.

The fifth switch can directly control charging and discharging of the energy storage element, for example, in the transportation and storage processes before installation and use, the fifth switch can be turned off, the fifth switch is turned on in normal use, and the battery pack BAT1 is connected to the boosting module through the fifth switch to supply power for emergency.

Referring to fig. 16, the fourth switch adopts a MOS transistor Q6, and the output terminal is connected to the indication module, i.e. the LED1, through a resistor R47 in the protection module. The resistor R47 is also connected in parallel with a capacitor C24.

The output terminal of the fourth switch charges the battery pack BAT1 through the resistor R44 (parallel resistor R45 and resistor R46), the diode D12, the fuse F4 and the fifth switch of the protection module.

A diode D12 is arranged between the indicating module and the energy storage element, so that the power supply to the indicating module can be avoided when the energy storage element discharges, the energy consumption is reduced, and the charging indicating function is not influenced.

In an embodiment, the switching module includes a second control element, a control end of the second control element is coupled to the output end of the fourth switch for detecting the voltage, and an output end of the second control element is coupled to the boosting module. In one embodiment, the input terminal of the boost module is coupled to the energy storage element and adopts an inductor for boosting. In one embodiment, the boost module includes a third controller, the inductor is coupled to the third controller to provide boost energy, and the output terminal of the second control element is coupled to the third controller to instruct the third controller to operate.

Referring to fig. 16 and 17, the second control element employs a transistor Q7, when there is a mains supply signal, that is, the output terminal of the fourth switch, that is, the MOS transistor Q6, is connected to the base of the transistor Q7 via the diode D13, the transistor Q7 is turned off, and cannot send a control signal to the boost module, and when the mains supply is powered off, the transistor Q7 is turned on, that is, sends a control signal for boosting and supplying power to the boost module.

The third controller U5, for example, an MT7282 chip is used, the energy storage element is connected to a pin 5 of the third controller U5 through an inductor L2, a transistor Q7 is connected to a pin 2 of the third controller U5 through a resistor R40, when the transistor Q7 is turned on, the third controller U5 receives a signal, outputs an oscillation signal through the pin 5 to boost the voltage of the inductor L2, and supplies power to the LED through a diode D11, a resistor R42 (a parallel resistor R43) and a diode D10 in sequence.

The switching module circuit of the application is simple, no capacitor is provided, and the switching time of emergency and normal lighting is shortened.

Referring to fig. 10 and 18, in an embodiment, the control module includes a single chip, and a power supply terminal of the single chip is coupled to the output terminal of the constant voltage module and the energy storage element.

In one embodiment, the control module further includes a voltage stabilizing unit, the output end of the constant voltage module and the energy storage element are both coupled to the input end of the voltage stabilizing unit, and the output end of the voltage stabilizing unit is coupled to the power supply end of the single chip.

The constant voltage module and the energy storage element can supply power to the control module at the same time, the power supply end of the single chip microcomputer U6 is pin 1, and the output end of the voltage stabilizing unit U7 is pin 1.

The output end of the constant voltage module is sequentially connected with the input end of a voltage stabilizing unit U7 through a diode D15 and a resistor R54; the energy storage element passes through diode D14 in proper order, and resistance R54 connects the input of voltage stabilizing unit U7, can realize two power supplies, can normally work under the various required states of guarantee singlechip.

The energy storage element and the commercial power supply are powered simultaneously when the energy storage element is powered on, and the commercial power supply is powered on when the energy storage element is powered off, so that the singlechip can work normally when the commercial power is recovered after the electric quantity of the energy storage element is discharged in an emergency state.

The output end of the voltage stabilizing unit U7 is also grounded through a capacitor C21, and the input end of the voltage stabilizing unit U7 is also grounded through a capacitor C20.

In order to collect the corresponding signal, in one embodiment, the output terminal of the constant voltage module is further coupled to the first signal input terminal of the single chip for the control module to detect the commercial power signal.

The first signal input end is a pin 6 of the single-chip microcomputer U6, the output end of the constant voltage module is connected with the pin 6 through a resistor R56, the pin 6 detects a mains supply signal, and the single-chip microcomputer U6 sends a corresponding signal to the fourth switch when the power is off. Pin 6 is also connected to ground through resistor R55 and capacitor C25, respectively.

In one embodiment, the single chip is coupled to the control terminal of the fourth switch through the first signal output terminal. The first signal output end is the pin 2 of the singlechip U6. In one embodiment, the energy storage element is further coupled to a second signal input end of the single chip microcomputer, and the control module detects the voltage of the energy storage element. The second signal input end is a pin 7 of the singlechip U6, which can reflect the voltage of the energy storage element and can correspondingly implement charge and discharge management when the voltage is too high or too low.

In one embodiment, two sides of the fifth switch are respectively coupled to the second signal input terminal and the third signal input terminal of the single chip, so that the control module can detect and compare voltages at two sides of the fifth switch. One end of the fifth switch connected with the energy storage element is connected to a pin 7 of the single chip microcomputer U6 through a resistor R57, and the pin 7 is grounded through a resistor R58 and a capacitor C23 respectively. The other end of the fifth switch is connected to a third signal input end, namely a pin 5 of the single chip microcomputer U6 through a resistor R52, and the pin 5 is grounded through a resistor R53 and a capacitor C22 respectively. If the input signals of the second signal input end and the third signal input end are the same, the fifth switch can be regarded as being on, and if the voltages of the second signal input end and the third signal input end are different, the fifth switch is turned off. In order to control the second optical coupler, in one embodiment, the single chip is coupled to the second optical coupler through a second signal output terminal. The second signal output end is a pin 3 of the singlechip U6.

The control module is composed of a single chip microcomputer and peripheral circuits connected with pins of the single chip microcomputer, the peripheral circuits are mainly used for processing signals and energy to meet the requirements of the single chip microcomputer, and therefore the power supply end, the signal input end and the signal output end of the control module are equivalent to those of the single chip microcomputer.

Referring to fig. 19 to 22, in an embodiment of the present application, an LED straight tube lamp is provided, which includes a lamp tube, an LED light bar 4 and a driving circuit are installed in the lamp tube, the lamp tube includes a tube body 1, and

end caps

2 and 3 fixed at two ends of the tube body 1, and two pins are fixed on each end cap respectively; for example, two pins 21 on the end cap 2 and two pins 31 in the end cap 3 constitute two electrical terminals, respectively.

In combination with the above embodiments, the driving circuit includes a signal branch, a utility power branch and an emergency branch having an energy storage module, the energy storage module supplies power to the LED when the power is off, and an external power supply supplies power to the LED through the utility power branch when the power is on; the signal branch is coupled with the lamp base at one end of the lamp tube and used for transmitting a driving signal to control the on-off of the commercial power branch, and the commercial power branch is coupled with the lamp base at the other end of the lamp tube and used for transmitting electric power to supply power to the LED lamp strip.

In one embodiment, the control module is further coupled with a third switch 53 for instructing the control module to turn off the commercial power branch to supply power to the LED light bar 4 and turn on the emergency branch to supply power to the LED light bar 4, a first circuit board is disposed in the lamp tube, the third switch 53 is fixed on the first circuit board, the lamp tube is provided with an avoidance opening, and a control button of the third switch 53 is exposed to the avoidance opening.

In one embodiment, the emergency branch includes an energy storage element coupled to a fifth switch 51 for controlling on/off of charging and discharging, a second circuit board is disposed in the lamp tube, the fifth switch 51 is fixed on the second circuit board, the lamp tube is provided with an avoiding opening, and a control button of the fifth switch 51 is exposed to the avoiding opening.

In one embodiment, an indicator 52 coupled to the energy storage element and displaying information during charging is disposed in the emergency branch, a third circuit board is disposed in the lamp tube, the indicator 52 is fixed on the third circuit board, the lamp tube is provided with an avoiding opening or a transparent area, and the indicator 52 is exposed at the avoiding opening or corresponds to the transparent area.

In one embodiment, the avoidance ports are integrally communicated or arranged at intervals.

In one embodiment, the circuit board 5 is formed by integrating all the circuit boards into a whole.

Referring to fig. 19 to fig. 22, an embodiment of the present application further provides an LED lamp, which includes a lamp tube, and an LED light bar 4 and a driving circuit are mounted in the lamp tube, and the driving circuit may use conventional technologies, and more preferably uses the driving circuits of the foregoing embodiments.

The lamp tube comprises a tube body 1, end covers 2 and end covers 3 which are fixed at two ends of the tube body, and two pins are respectively fixed on each end cover; for example two pins 21 on the end cap 2 and two pins 31 in the end cap 3.

In one embodiment, the tube body 1 includes a bottom shell 11 and a light-transmitting cover 12 which are fastened to each other in a radial direction, the outer wall of the bottom shell 11 on two opposite sides in the radial direction is provided with a first clamping groove 111, the inner wall of the two opposite sides in the radial direction is provided with a second clamping groove 112, the inner wall of the light-transmitting cover 12 is provided with a clamping tongue 132 which is matched with the first clamping groove 111, the LED light bar 4 includes a substrate and an LED fixed on the substrate, and the substrate is clamped and fixed on the second clamping groove 112; be provided with the switch and/or the pilot lamp that are coupled with drive circuit in the fluorescent tube 1, the inner wall of printing opacity cover 12 is equipped with constant head tank 131, and constant head tank 131 internal fixation has circuit board 5, and switch and/or pilot lamp are all fixed on circuit board 5, and printing opacity cover 12 has still been seted up and has been dodged the mouth, and switch and/or pilot lamp expose and dodge the mouth.

For example, the switch and indicator lamp in the foregoing embodiments specifically include the third switch 53, the fifth switch 51, and the indicator lamp 52. Three avoidance ports are arranged at intervals, and the three avoidance ports respectively correspond to and expose the third switch 53, the fifth switch 51 and the indicator lamp 52.

In one embodiment, a mounting chamber 113 is disposed between the substrate and the bottom case 11, and the driving circuit is fixed in the mounting chamber 113 by a circuit board. In one embodiment, the bottom housing 11 and the transparent cover 12 are respectively semi-cylindrical. In one embodiment, bottom shell 11 is made of a section bar. The exterior of the bottom case 11 may be provided with heat dissipation ribs 114. In one embodiment, two circumferential edges of the bottom case 11 are turned inward to form a bent portion, the first engaging groove 111 is disposed on an outer side of the bent portion, and the second engaging groove 112 is disposed on an inner side of the bent portion. In one embodiment, the light-transmitting cover 12 has a multi-section structure spliced with each other along the length direction, a section at the end is used as the installation section 13, and the positioning groove 131 is formed in the inner wall of the installation section. In one embodiment, the positioning slots 131 are two oppositely disposed, and two opposite sides of the circuit board 5 are inserted into the corresponding positioning slots 131. In one embodiment, the inner wall of the mounting section 13 is provided with a pair of protruding strips, and the gap between the pair of protruding strips is used as a positioning slot 131. In one embodiment, the

end caps

2 and 3 are respectively fixed to two ends of the tube 1.

The working process of the LED emergency lamp according to the present application is specifically described with reference to the foregoing embodiments and the accompanying drawings, and after the LED emergency lamp is installed, the fifth switch is turned on.

In the initial state, the first switch coupled to the first terminal is open, i.e. the first terminal has no mains input (120V-277V), and the second switch is a normally closed switch, so that the second terminal has a mains input (120V-277V).

The first optical coupler switch is switched off, the working precondition of the constant current module (MT7933) is not satisfied, namely the MOS transistor Q4 is switched on to ground the base of the triode Q3, so that the triode Q3 is switched off, the power supply terminal pin 5 of the first controller U2 is not powered on, the first controller U2 does not work, an external power supply cannot supply power to the LED through a mains supply branch, and the LED cannot be normally lightened.

Because the second end has commercial power input, the singlechip of constant voltage module (MT7990) and control module all works. After the single chip microcomputer works, the MOS transistor Q6 serving as the fourth switch is firstly conducted, so that the base of the triode Q7 is high in potential and is not conducted, then the third controller U5(MT7282) of the boosting module does not work, the inductor L2 cannot boost the voltage to supply power to the LED, and an emergency branch cannot supply power to the LED.

Since the MOS transistor Q6 is turned on, the battery pack BAT1 can be charged normally, and the LED1 indicator is turned on.

When the user need turn on the lamp and use the illumination function, trigger first switch closure, first end was gone up the electricity this moment, and first opto-coupler switch switches on, and corresponding constant current module work prerequisite is established, MOS pipe Q4's grid low potential and turn off promptly, and triode Q3 switches on and supplies power for first controller U2's power foot 5, and the commercial power branch circuit switches on and lights LED this moment.

Similarly, the emergency branch circuit cannot supply power to the LED, the battery pack BAT1 can be charged normally, and the light-emitting diode LED1 indicator light is turned on.

If the second switch (detectable emergency branch circuit) is switched off, the second end loses power, the second rectifying and filtering unit cannot output electric energy, the constant voltage module and the constant current module do not work, certainly, the battery pack BAT1 is not charged, and the light emitting diode LED1 is not lighted.

Because the singlechip U6 of control module is supplied power by group BAT1, still normally works, and singlechip U6 can't detect the commercial power signal at the output of constant voltage module, consequently turn off MOS pipe Q6, and triode Q7 as second control element switches on, and the third controller U5 of the module that steps up works then, and inductance L2 steps up and supplies power for the LED, and emergent branch road supplies power for the LED promptly.

In the state, the second switch is disconnected, which is similar to the power failure of the mains supply, because the constant current module does not work, the first optical coupler is disconnected or closed meaninglessly, and the corresponding first switch does not work.

If the third switch is switched on (the emergency branch can be detected), the singlechip U6 obtains an instruction and enables the second optocoupler to be switched on, the triode Q3 is switched off, power cannot be supplied to the power pin 5 of the first controller U2, the constant current module does not work, the commercial power branch cannot supply power to the LED, and the LED cannot be normally lightened.

Meanwhile, the single chip microcomputer U6 also enables the MOS tube Q6 to be disconnected, the battery pack BAT1 is not charged, and the light emitting diode LED1 is not lighted. The MOS tube Q6 is disconnected to enable the triode Q7 of the switching module to be conducted, then the third controller U5 of the boosting module works, the inductor L2 boosts the voltage to supply power to the LED, and an emergency branch supplies power to the LED.

In this state, since the constant current module does not work, it is meaningless that the first optical coupler is opened or closed, and the corresponding first switch does not work.

The second switch is arranged in an alternating current circuit outside the lamp tube, the third switch is directly arranged on the lamp tube, the double-emergency detection function is realized, the third switch can facilitate detection during installation, and the second switch can facilitate detection after installation.

When the mains supply is powered off, the first end and the second end are not provided with the mains supply, the constant voltage module and the constant current module do not work, the mains supply branch cannot supply power to the LED, and the LED cannot be normally lightened. Meanwhile, the MOS transistor Q6 is turned off, the battery pack BAT1 is not charged, and the light emitting diode LED1 is not lit. The triode Q7 is conducted, then the third controller U5 of the boosting module works, the inductor L2 boosts the voltage to supply power to the LED, and the emergency branch supplies power to the LED.

In order to protect the battery pack from over-discharge, the singlechip U6 detects the power supply time of the emergency branch, when the time is more than 90 minutes (related to the capacity of the battery pack BAT1 and can be adjusted as required actually), the voltage of the battery pack BAT1 is reduced to an early warning value, the power supply is stopped through a charge and discharge management module of the singlechip U6 or the battery pack BAT1, the LED is turned off, and the singlechip U6 can be communicated with the charge and discharge management module.

Because battery BAT1 voltage is lower, consequently the singlechip also stops work, gets into sleep energy-conserving state.

When the commercial power is recovered, the first end and the second end are provided with the commercial power, and the constant voltage module, the constant current module (according to the first switch state) and the single chip microcomputer can work normally.

In one embodiment, the single chip microcomputer charges and discharges energy storage elements in the energy storage module at regular time. The performance of the energy storage element is convenient to maintain.

In one embodiment, the single chip microcomputer sleeps when not receiving the commercial power signal. Failure to receive the mains signal may be a power outage or the second switch being open, i.e. the constant voltage module has no output. The fifth switch is opened, which is generally a transportation or storage process, and the energy storage element is not yet in an operating state. The single chip microcomputer is in a low power consumption state after entering the sleep mode. And the singlechip is awakened until the sleep condition is relieved, for example, the second end is electrified.

In one embodiment, the singlechip turns off the constant current module and turns on the fourth switch when the fifth switch is turned off.

In one embodiment, the single chip microcomputer charges and discharges energy storage elements in the energy storage module at fixed time after the LED emergency lamp is used for a preset time (for example, 30 days), and the timing is interrupted during the sleep period. The single chip microcomputer starts to time after being electrified for the first time, but the time is interrupted during the sleep period, the single chip microcomputer continuously enters a timing state after being awakened, and the timing time is accumulated.

An embodiment of the present application further provides a control method of an LED emergency lamp, where the LED emergency lamp is the LED emergency lamp according to the foregoing related embodiment, and the control method includes that the control module charges and discharges the energy storage element in the energy storage module at regular time.

In one embodiment, during discharging, the commercial power branch is turned off first, and then the emergency branch is driven to supply power to the LED.

In one embodiment, the mode of turning off the commercial power branch is to send a signal to the constant current module through the second optical coupler, and turn off the constant current module. After the control module enables the second optocoupler to be conducted, the base electrode of the triode Q3 is grounded and is turned off, the first controller U2 stops working, and the mains supply branch does not supply power to the LED any more.

In one embodiment, the manner of driving the emergency branch to supply power to the LED is to turn off the fourth switch, and the switching module enables the boosting module to supply power to the LED.

The discharge level can be controlled as a function of time and/or energy storage element voltage, for example: in one embodiment, after the predetermined time of discharging, the driving emergency branch is turned off to supply power to the LED. In one embodiment, when the voltage of the energy storage element is discharged to be lower than the threshold value, the driving emergency branch is turned off to supply power to the LED. In one embodiment, the manner of turning off the driving emergency branch to supply power to the LED is to turn on the fourth switch. In one embodiment, during charging, the driving emergency branch is first turned off to supply power to the LED, and then the utility power branch is turned on. In one embodiment, the manner of turning on the utility power branch is to turn off the second optocoupler. After the control module turns off the second optocoupler, the turn-off control right is released, and then, whether the triode Q3 is conducted or not and the first switch state are used for controlling whether the mains supply branch supplies power to the LED or not.

The control sequence of the discharging and charging is also to be avoided in common.

Referring to fig. 23, the control logic of the control module in the LED of the present application is shown in the figure.

In the figure, a general single chip microcomputer of a control module is taken as an action main body, wherein the switching on and off of the constant current module refers to sending a signal to the constant current module through a second optical coupler so as to release or obtain the switching off control right of the constant current module. When the constant current module is switched on, the single chip pin 3 is set to be at a low level, and when the constant current module is switched off, the single chip pin 3 is set to be at a high level.

Turning the fourth switch on and off means charging or not charging the battery pack and also means that the battery pack does not supply power or supplies power to the LEDs through the emergency branch. When the fourth switch is turned on, the single chip pin 2 is set to be at a high level, and when the fourth switch is turned off, the single chip pin 2 is set to be at a low level.

The detection of the commercial power signal is judged by judging whether a pin 6 of the single chip microcomputer is in a high level, whether the third switch is closed or not is judged by judging a pin 4, whether the fifth switch is closed or not is judged by comparing the voltages of a pin 5 and a pin 7, and whether the voltage of the battery pack is higher than a threshold value or not is judged by judging the voltage of the pin 7. The battery pack discharges, namely in the process of supplying power to the LED through the emergency branch, the single chip microcomputer is in a low-power detection state, the voltage of the battery pack is detected at any time, and over-discharge is avoided, so that the battery is protected.

In combination with the related embodiments, an embodiment of the present application provides a method for controlling an LED emergency light, including: s100, detecting a mains supply signal after starting up; s200, if the commercial power signal is detected, whether a fifth switch is closed is detected; s300, if the fifth switch is detected to be closed, detecting whether the third switch is closed; s400, if the third switch is not closed (meaning that the LED can work normally), sending a conducting signal to the fourth switch; and S500, sending a signal for releasing the control right to the constant current module after time delay (for example, 50 ms). The LED emergency lamp can be switched on and off by utilizing the first switch.

And sending a signal for releasing the turn-off control right to the constant current module, namely closing the second optocoupler.

In one embodiment, in step S200, when detecting whether the fifth switch is closed, if the fifth switch is closed, the constant current module is turned off, and the fourth switch is turned off after a delay. In one embodiment, in step S300, when detecting whether the third switch is closed, if the third switch is closed (meaning that the emergency branch test needs to be performed), the constant current module delays and turns off the fourth switch. In one embodiment, the low power detection state is entered when the third switch closure time exceeds a threshold (e.g., five seconds).

In the embodiment, an active discharge detection function is configured, when the single chip microcomputer detects that the closing time of the third switch exceeds a threshold value (for example, five seconds), the energy storage element discharges, the constant current module is turned off first when the discharge is performed, and the fourth switch is turned off after the time delay; namely, the LED is powered through the emergency branch circuit to discharge the energy storage element, and meanwhile, the service time is reset.

In one embodiment, the control method of the LED emergency lamp further includes recording a normal use time of the LED emergency lamp, and discharging the energy storage element in the energy storage module when the use time reaches a threshold (for example, 30 days). When discharging, the constant current module is turned off first, and the fourth switch is turned off after time delay; namely, the LED is powered through the emergency branch circuit to realize the discharge of the energy storage element; in the discharging process, the voltage of the energy storage element is detected in real time, and when the voltage of the energy storage element is low to an expected value, the fourth switch is conducted (namely, the energy storage element is charged and no emergency branch is used for supplying power to the LED); and after time delay, a signal for releasing the turn-off control right is sent to the constant current module (namely, the second optical coupler is closed).

This application LED emergency light both can normally switch, has conventional illumination fluorescent tube function, can also regard as emergency light when not having the commercial power, and commercial lighting and emergency are general promptly. When removed from the lampholder, the lamp can also be used for mobile emergency lighting.

Claims

The control method of the LED emergency lamp comprises an LED and a driving circuit, the driving circuit comprises an emergency branch circuit, a mains supply branch circuit and a control module, the mains supply branch circuit comprises a charging circuit and an energy storage module, the energy storage module is provided with a signal input end coupled with the charging circuit to detect a charging signal, an external power supply supplies power to the LED through the mains supply branch circuit and charges the energy storage module through the charging circuit during power-on, the energy storage supplies power to the LED during power-off, the control module is provided with a signal input end used for detecting the mains supply signal, and the control method is characterized by comprising the following steps of:

when the power is cut off, the control module firstly cuts off the commercial power branch and then cuts off the charging circuit;

when the power supply is powered on, the control module firstly conducts the charging circuit to enable the energy storage module to stop supplying power to the LED, and then the control on the disconnection of the commercial power branch is released.
2. The control method according to claim 1, wherein the utility power branch comprises a second rectifying and filtering module, a constant voltage module and a fourth switch controlled by the control module, which are coupled in sequence, a signal input terminal of the energy storage module is coupled to an output terminal of the fourth switch, the control module turns off the fourth switch when the power is off, and the control module turns on the fourth switch when the power is on.
3. The control method according to claim 2, wherein the utility power branch comprises a second rectifying and filtering module and a constant current module which are coupled in sequence, and the second rectifying and filtering module is shared with the emergency branch.
4. The control method of claim 2, wherein the signal input terminal of the control module is coupled to the output terminal of the constant voltage module.
5. The control method according to any one of claims 1 to 4, wherein the driving circuit includes a third switch coupled to the control module, and if the third switch is closed, the control module sequentially turns off the commercial power branch and the charging circuit, and if the third switch is opened, the control module turns on the charging circuit first and then releases the control of turning off the commercial power branch.
6. The control method according to any one of claims 1 to 3, wherein the energy storage module has a fifth switch for controlling charging and discharging thereof, and if the fifth switch is turned off, the control module sequentially turns off the commercial power branch and closes the charging circuit, and if the fifth switch is turned on, the control module firstly turns on the charging circuit and then releases the turn-off control of the commercial power branch.
7. The control method according to claim 1, wherein the LED emergency has two power connection terminals, a first terminal and a second terminal, the driving circuit further includes a signal branch, the signal branch is coupled to the first terminal, the utility power branch and the emergency branch are coupled to the second terminal, if the external driving signal is not received by the utility power branch through the signal branch, the utility power branch is disconnected, and if the external driving signal is received by the utility power branch through the signal branch, the control of disconnecting the utility power branch is released.
8. The control method according to claim 1, wherein the energy storage module comprises an energy storage element, and if the control module detects that the output voltage of the energy storage element is lower than a set value, the control module enters a sleep state.
9. The control method according to claim 8, wherein the sleep state is released if the control module detects a commercial power signal.
10. The control method according to claim 1, wherein the control module periodically turns off the mains branch and the charging circuit in sequence, so that the energy storage module supplies power to the LED.