CN101598287B - Fire-fighting emergency light - Google Patents
Fire-fighting emergency light Download PDFInfo
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- CN101598287B CN101598287B CN2009101467833A CN200910146783A CN101598287B CN 101598287 B CN101598287 B CN 101598287B CN 2009101467833 A CN2009101467833 A CN 2009101467833A CN 200910146783 A CN200910146783 A CN 200910146783A CN 101598287 B CN101598287 B CN 101598287B
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Abstract
The invention provides a fire-fighting emergency light, which comprises a lithium battery, one or more LEDs and control circuits, wherein the control circuits comprise a main controller, a power supply control circuit, a charge-discharge circuit, a signal detection and switch control circuit and a working status indicating and outputting circuit. The lithium battery of the fire-fighting emergency light has the charge-discharge function and can automatically switch the status; the phenomenon of uneven brightness caused by the voltage change of the lithium battery can be changed by regulating discharge current, so the service life of the LED is prolonged; and the entire control circuits of the emergency light adopt fewer components, have more reliable overall performance, conform to national standards, and meet the fire-fighting and family demand on the fire-fighting emergency light.
Description
Technical field
The present invention relates to a kind of emergency luminaire, more specifically, the present invention relates to a kind of fire emergency lamp.
Background technology
Fire emergency lamp is the emergent a kind of guarantee of public place safety, is the compulsive measures of public fire protection, and its scope of application is wide, arranges the environment more complicated.Usually, fire emergency lamp has the two function of fire-fighting emergency headlamp and fire-fighting emergent sign for safe evacuation lamp, and wherein, fire-fighting emergency headlamp is installed on fire-fighting life-saving passage place usually, when having a power failure, during situation such as fire alarm, can turning on light automatically and realize function of emergency illumination; Fire-fighting emergent sign for safe evacuation lamp is used to indicate the position and the direction of fire-fighting life-saving passage.
Common fire emergency lamp generally adopts battery as supplying cell on the market, the voltage condition that detects supplying cell by battery voltage detection circuit provides charging and discharging of accumulator control, and the fluctuation of accuracy in detection causes supplying cell is discharged and recharged the inaccurate of control.In addition, because the difference of factors such as the manufacturer of supplying cell, specifications and models, newness degree, environment for use, existing charge mode or charging circuit are difficult to satisfy the needs that universality is used, and cell voltage is once there being reduction to charge, owing to the frequent shortening in service life that causes supplying cell that discharges and recharges.
Existing fire emergency lamp adopts common bulb as light source mostly, because the filament cold-state resistance of common bulb is very little, the phenomenon that the lamp tungsten filament blows appears in instant igniting bulb easily.And also have part to use LED as light source, because the control circuit of current LED is compared with the control circuit of common bulb and is changed, exist supplying cell to discharge and recharge frequent equally and cause the LED supply voltage frequently to change, make that the brightness of LED is often inhomogeneous because its supply voltage frequently changes when emergent the use, thus the service life of having reduced LED.
Summary of the invention
Supplying cell discharges and recharges frequent and inaccurate supplying cell and the short defective of light source life of causing in the existing fire emergency lamp in order to overcome, and the present invention proposes a kind of fire emergency lamp.
According to an aspect of the present invention, proposed a kind of fire emergency lamp, comprised one or more LED and control circuit, it is characterized in that:
Described fire emergency lamp also comprises the lithium battery as supplying cell;
Described control circuit comprises master controller and the charge-discharge circuit, signal detection and the ON-OFF control circuit that link to each other with described master controller respectively, duty indication and output circuit;
Described signal detection and ON-OFF control circuit are used for decay and detect line voltage and lithium battery voltage, and detection signal is sent to described master controller;
Described charge-discharge control circuit comprises the charging circuit of the pulse-width modulation circuit with the ripple that is used to adjust the lithium cell charging electric current and reduces lithium cell charging, and is used for by adjusting being connected and the discharge circuit that disconnects to the lithium battery discharge of load;
Described duty indication and output circuit are used to control the duty of described LED and buzzer;
Described master controller is used for judging by the magnitude of voltage of signal detection and ON-OFF control circuit collection civil power and lithium battery and load the state of current civil power, lithium battery and load, come charging and discharging lithium battery by charge-discharge control circuit, and control LED indication, fault alarm by duty indication and output circuit.
Described fire emergency lamp also comprises power control circuit, and described power control circuit is used to control the electric current one-way transmission of power supply to lithium battery, and is used to described master controller stable power-supplying.
Described fire emergency lamp also comprises:
Lamp socket is used for described fire emergency lamp is fixed in illumination or indicating positions;
Lampshade.
Described fire emergency lamp also comprises circuit board, and described one or more LED is arranged in the one side of described circuit board, arranges described lithium battery and described control circuit on the another side of described circuit board.
Described signal detection and ON-OFF control circuit also are used to detect button and obtain the manually-operated indication, to open and close described control circuit.
Described master controller starts discharge circuit according to the situation that current line voltage is lower than normal value, and starts charging circuit according to the situation of the normal and current lithium battery needs charging of current line voltage.
Described master controller detects described lithium battery open circuit or short circuit, starts failure alarm circuit.
Described master controller detects lithium battery and forces down when preset value, starts charging circuit and carries out low current charge, and wherein, described preset value is 4.05 volts, and described little electric current is 0.1 times of peak point current.
When described master controller detects lithium battery voltage greater than 2.9V, described charging circuit is worked as constant-current charge to described lithium battery constant-current charge, when lithium battery voltage equals 4.2V, adjust charging current by described pulse-width modulation circuit, keep lithium battery voltage and be stabilized in 4.2V.
In discharge process, the size of described pulse-width modulation circuit control discharge current when lithium battery voltage is higher than 3.2V, reduces discharge current; When lithium battery forces down in 2.9V, improve discharge current, discharge current is consistent.
The present invention has highly effective and safe charging and discharging lithium battery function, and the supplying cell state is automaticallyed switch; Regulate charging current by pwm circuit and change supplying cell owing to voltage changes the phenomenon that brightness irregularities occurs, the service life of having improved LED; Whole emergency light control circuit adopts components and parts still less, and overall performance is more reliable, meets national standard, satisfies fire-fighting and the family demand to fire emergency lamp.
Description of drawings
Fig. 1 is the block diagram of the control circuit of fire emergency lamp according to an embodiment of the invention;
Fig. 2 is the control circuit schematic diagram of fire emergency lamp according to an embodiment of the invention;
Fig. 3 is the control flow chart of fire emergency lamp according to an embodiment of the invention;
Fig. 4 is the lithium cell charging curve map of fire emergency lamp according to an embodiment of the invention;
Fig. 5 is the lithium cell charging flow chart of fire emergency lamp according to an embodiment of the invention; With
Fig. 6 is the encapsulation schematic diagram of the master controller of fire emergency lamp according to an embodiment of the invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments a kind of fire emergency lamp provided by the invention is described in detail.
Fig. 1 illustrates the block diagram of the control circuit of fire emergency lamp according to an embodiment of the invention.As shown in Figure 1, the control circuit of fire emergency lamp comprises master controller, power control circuit, charge-discharge circuit, signal detection and ON-OFF control circuit, duty indication and output circuit.
Signal detection links to each other with master controller with ON-OFF control circuit, comprises signal deteching circuit and ON-OFF control circuit.Signal deteching circuit is used for as bleeder circuit the line voltage, the supplying cell voltage that insert being decayed and filtering, and is used for as bleeder circuit by master controller LED signal attenuation.ON-OFF control circuit is used to detect button and obtains artificial operation indication, to realize the open and close of The whole control circuit.And signal detection and ON-OFF control circuit are transferred to master controller with line voltage signal, supplying cell voltage signal, button index signal.
Power control circuit links to each other with master controller, is used for the power supply filtering to the The whole control circuit, and is used to control the electric current one-way transmission of power supply to supplying cell, also is used to constitute a filter regulator circuit and comes to the master controller stable power-supplying.
Charge-discharge control circuit links to each other with master controller, comprises charging circuit and discharge circuit.Charging circuit comprises pulsewidth modulation (PWM) circuit, the ripple that is used to adjust the size of supplying cell charging current and reduces the supplying cell charging.Discharge circuit is used for supplying cell being discharged with disconnection by the connection of adjusting load.
The duty indication links to each other with master controller with output circuit, comprises LED, the buzzer of different indications, be used to indicate the duty of whole fire emergency lamp, and output current is controlled the work of LED and buzzer.
Master controller is used for judging by the magnitude of voltage of signal detection and ON-OFF control circuit collection civil power, supplying cell and load the state of current civil power, supplying cell and load, the control that realization discharges and recharges supplying cell by charge-discharge control circuit, realize by duty indication and output circuit to LED indicate, the control of fault alarm.
Fig. 2 illustrates the detailed schematic diagram of the control circuit of fire emergency lamp shown in Figure 1 according to an embodiment of the invention.Referring to illustrated in figures 1 and 2, wherein, charging circuit is formed pwm circuit by diode D5, triode Q2 and Q4, capacitor C 2, resistance R 15, conducting by control triode Q4 and end the control that realizes supplying cell charging current size, the control of concrete size of current is following to be described in detail in conjunction with Fig. 4 and Fig. 5.Capacitor C 2, resistance R 15 constitute the RC filter circuit, reduce the ripple of supplying cell charging, make system's charging more stable.
Discharge circuit is made up of triode Q6 and Q7, resistance R 22 and R2, load U1 and U2, and master controller is realized controlling the conducting of triode Q6, Q7 and ending by the high-low level of controlling its 3rd pin, thus the discharge circuit of control load.
Duty indication and output circuit are made up of light emitting diode L2 (redness), light emitting diode L1 (yellow), light emitting diode L3 (green), resistance R 8, R17, R29, R30, triode Q8 and Q9 and buzzer.Light emitting diode L2, L1 come step-down and connect master controller by resistance R 8, and light emitting diode L3 is by the R37 step-down and connect master controller, and resistance R 29 and R30, triode Q8 and Q9, buzzer are formed the audible alarm circuit.
Power control circuit comprises Bridge BR1, resistance R 1, R2, R13, R31, RNC, diode D5, D6, D7, capacitor C 1, C6, CNC, voltage-stablizer TL431 (Q3).Resistance R 1 and capacitor C 1 are formed the RC filter circuit, and system power supply is carried out filtering.Diode D5 realizes the unidirectional conducting of electric current, makes electric current to charge to supplying cell from power supply, and can not oppositely flow into power supply from supplying cell.Diode D6 and D7 are used to prevent that the electric current of power supply charges to supplying cell.Insert voltage-stablizer TL431 after the power supply process RC filtering, the filter circuit of forming by resistance R NC, capacitor C NC and C6 makes voltage be stabilized in 2.5V and powers to master controller again.
Signal deteching circuit comprises resistance R 14, R18, R25, R49, R21, R20, R23, R24, capacitor C 5, and resistance R 14, R18 are formed bleeder circuit and be used to the line voltage of decaying, and by 5 pairs of signal filterings of capacitor C and insert master controller.Resistance R 25, R49 form bleeder circuit and are used for decay of supplying cell voltage signal and access controller, resistance R 2R20 forms bleeder circuit and is used for load U1 signal attenuation and access controller, and resistance R 23, R24 form bleeder circuit and be used for load U2 signal attenuation and access controller.
ON-OFF control circuit is made up of triode Q2 and Q5, resistance R 3, R4, R7, button K1, and master controller is realized man-machine mutual by the state that detects button K1.Current when detecting for the city is electrically connected, then start discharge circuit; When detecting the current shutdown that is, then the high level of the 14th pin by the control master controller comes conducting Q1, and Q5 is ended, and with the The whole control down circuitry, realizes the shutdown function.
Fig. 3 illustrates the control flow of fire emergency lamp according to an embodiment of the invention.Master controller starts, to the initialization of The whole control circuit, comprise: (for example master controller, the MCU that adopts in the present embodiment) internal RAM zero clearing, the input/output state of I/O mouth is set, and it is input pattern (high resistant pattern) that 4 I/O mouths that signalization detects, button detect the I/O mouth, various status indicator lamp LED (red lights, amber light, green light), discharge and recharge the pwm circuit control pin, the power supply control pin is arranged to output mode.
The magnitude of voltage that master controller is gathered civil power, supplying cell and load by signal deteching circuit is judged the state of current civil power, supplying cell, load.If current line voltage is lower than normal value, then open discharge circuit, and change the PWM control of discharge current according to the magnitude of voltage of supplying cell, realize control to the load discharge electric current; If current line voltage is normal, judge then whether supplying cell voltage needs charging, needs charging as current supplying cell, then opens charging circuit, charges.
Master controller is judged the state of current supplying cell by the supplying cell magnitude of voltage, changes the PWM control of charging current, thereby changes the supplying cell size of current, realizes discharging and recharging supplying cell.As supplying cell voltage undesired (supplying cell open circuit or supplying cell short circuit), then start-up system failure alarm circuit.
Judge the present load state by detecting the load voltage value, as load voltage undesired (load open circuit or load short circuits), duty indication and output circuit indication comprise: if current civil power is normal, then green light is opened; If current supplying cell charges, then red light is bright; If current supplying cell is in discharge or stops, the red light that then charges is closed; If current control circuit breaks down (supplying cell short circuit open circuit or load short circuits open circuit), then amber light is opened, and buzzer rings; If current control circuit trouble shooting, then amber light is closed, and buzzer stops.
Master controller by the sense switch control circuit key to run or stop control circuit.If detect button is that current civil power is normal, is the connection civil power, then opens discharge circuit; If current civil power is in power down mode, then closing control circuit.
Fig. 4 illustrates the lithium cell charging curve map of fire emergency lamp according to an embodiment of the invention.Can see that from diagramatic curve the high charge final voltage of lithium battery is 4.2V, can not overcharge that if continue charging, lithium battery voltage can not continue to improve yet, and also can destroy the internal structure of lithium battery; Phenomenon can not appear putting in same lithium battery in discharge process, if lithium battery voltage is lower than 3V, will destroy the internal structure of lithium battery.Master controller is judged the state of current lithium battery by the voltage of real-time collection lithium battery, revises the PWM control of charging and discharging currents, realizes the control to lithium battery voltage.
It can also be seen that from the curve map of Fig. 4 lithium battery is pressed in the process of 3V-4V voltage and promotes very soon, obviously slow down and arrived the amplitude that voltage rises after the 4V, then can be according to the control of this characteristic respective design charge-discharge circuit of lithium battery.
Fig. 5 illustrates the lithium cell charging flow chart of fire emergency lamp according to an embodiment of the invention.As shown in Figure 5, charging process is divided into 5 kinds of mode phases: shutdown mode, and the preliminary filling pattern, constant current charging mode, constant-voltage charge pattern and charging finish.
The shutdown mode stage is meant after lithium battery is full of electricity, control circuit stops to lithium cell charging, because long-time not charging, the electric weight of lithium battery reduces, when lithium battery forces down in the value of defining (among the figure for 4.05V), control circuit starts charging procedure once more.
When lithium battery enters charged state, according to the characteristic of lithium battery, because the lithium battery state is not very stable, the electric current that begins to charge is all very little, i.e. the preliminary filling mode phases.As shown in Figure 5, electric current is 0.1 times of peak point current, and when detecting current lithium battery voltage＞2.9V, the preliminary filling mode phases finishes.
Charge characteristic according to lithium battery, voltage the voltage of 3V-4V rise very fast, enter constant current charging mode, charging current is also mentioned maximum, master controller is by detecting the PWM control that the current magnitude of voltage of lithium battery changes current charging current, realize constant-current charge, when voltage=4.2V, the constant current charging mode stage finishes.
The constant current charging mode stage promptly enters the constant-voltage charge pattern after finishing, and by detecting the voltage of lithium battery, adjusts the PWM control of electric current, keeps lithium battery voltage and is stabilized in 4.2V.Detect the lithium cell charging electric current, if during the peak point current of charging current＜0.1 times, lithium battery has been full of electricity, then the charge closing program.
Lithium battery discharge control: according to the characteristic of lithium battery, the lithium battery discharge must be within a safe range, and this is worth between 2.9V-3.2V, in the present embodiment, selects 3.1V.If lithium battery forces down in 3.1V, closing control circuit, better protection lithium battery.
In addition, the service life of LED lamp and brightness evenly have very big relation, and the fire-fighting lamp also needs to keep the brightness of LED lamp even in the process of discharge.When the lithium battery electric weight was sufficient, discharge current was bigger; And when lithium battery voltage was very low, discharge current was but very little, guarantee that brightness is even, then need to guarantee lithium battery discharge current unanimity, so in discharge process, use pwm circuit to control the discharge current size, make the discharge current unanimity, promptly make the brightness unanimity of LED.Can change the control of discharge current PWM according to the size of lithium battery voltage, when lithium battery voltage is very high, reduce discharge current; And when the lithium battery pressure ratio is low, improve discharge current, and realize that pwm circuit changes because voltage changes the phenomenon that brightness irregularities occurs by regulating, thereby realize that LED brightness is even, improve the service life of LED.
Fig. 6 illustrates the encapsulation schematic diagram of the master controller of fire emergency lamp according to an embodiment of the invention.In the present embodiment, master controller shown in Figure 2 adopts microcontroller (MCU).Below describe pinout and annexation when using MCU to control in detail.
As shown in Figure 6, common I/O mouth: P1.2 (1 pin), P1.1 (2 pin), P1.0 (3 pin), P0.3 (4 pin), P0.2 (5 pin), P0.1 (6 pin), P0.0 (7 pin), P2.0 (9 pin), P3.2 (10 pin), P3.1 (12 pin), P3.2 (13 pin), P1.5 (14 pin), P1.4 (15 pin), P1.3 (16 pin).
Specific function I/O mouth: COMP1+ (2 pin), COMP1-(3 pin), COMP0+ (6 pin), COMP0-(7 pin).
AD translation function I/O mouth: AN3 (4 pin), AN2 (5 pin), AN1 (6 pin), AN0 (7 pin).
Crystal oscillator I/O mouth: OSC OUT (13 pin), OSC IN (12 pin).
I/O mouth: RES (10 pin) resets.
Timer I/O mouth: RTCC (5 pin).
Power supply and ground wire: VDD (11 pin), GND (8 pin).
Wherein:
P1.2 (1 pin), common I/O mouth can be arranged to input pattern (internal driving is very high, also is the high resistant pattern), can only can not be used as output as input under the input pattern, and pin status is determined by the outside; Can be arranged to output mode (push-pull mode), can only be as output, pin status is determined by inside.
P1.1 (2 pin) can do common I/O mouth, and input/output function is arranged; Also can be arranged to comparison pattern, under comparison pattern, can and P1.0 (3 pin) form a comparator.
P1.0 (3 pin) can do common I/O mouth, and input/output function is arranged; Also can be arranged to comparison pattern, under comparison pattern, can and P1.1 (2 pin) form a comparator.
P0.3 (4 pin) can be arranged to common input and output mode, also can be arranged to the AD pattern, and as AD converter, precision is 8 AD.
P0.2 (5 pin) can be arranged to common input and output mode, also can be arranged to the AD pattern, and as AD converter, precision is 8 AD, can also be arranged to timer I/O mouth
P0.1 (6 pin) can be arranged to common input and output mode, also can be arranged to the AD pattern, and as AD converter, precision is 8 AD; Also can be arranged to comparison pattern, under comparison pattern, can and P0.0 (7 pin) form a comparator.
P0.0 (7 pin) can be arranged to common input and output mode, also can be arranged to the AD pattern, and as AD converter, precision is 8 AD; Also can be arranged to comparison pattern, under comparison pattern, can and P0.1 (6 pin) form a comparator.
OSC IN (13 pin) can be arranged to the crystal oscillator input pin, also can be arranged to common I/O mouth.
OSC OUT (14 pin) can be arranged to the crystal oscillator output pin, also can be arranged to common I/O mouth.
The present invention adopts LED as light source, uses lithium battery to replace battery, adopts microcontroller (MCU) to replace analog circuit, like this can science give lithium cell charging, efficiently control LED, make the LED longer service life, maintenance cost reduces.
For the embodiment that describes before, fire emergency lamp comprises supplying cell, light source and is arranged in control circuit on the circuit board.Fire emergency lamp can also comprise the lamp socket that is used to be fixed in illumination or indicating positions.In another embodiment, this fire emergency lamp can also comprise lampshade, to prevent the infringement of surrounding environment to it.In yet another embodiment, this fire emergency lamp can also comprise the power line that links to each other with civil power.In one embodiment, this supplying cell is a lithium battery, also can select the battery with the function of discharging and recharging commonly used on the market but those skilled in the art are appreciated that this supplying cell.
In one embodiment, light source is one or more LED, and this one or more LED is arranged on the one side of circuit board, arranges supplying cell on the another side of circuit board, and in the present embodiment, this supplying cell is a lithium battery.On circuit board, arrange the control circuit of the one side layout fire emergency lamp of supplying cell, be appreciated that this control circuit also can be arranged in LED place one side, still, avoid the interacting of heating of LED and control circuit, preferably this control circuit is arranged in supplying cell place one side.In another embodiment, one or more of supplying cell, light source and control circuit can be arranged in the same one side of circuit board or coplanar not.
It should be noted that at last, above embodiment is only in order to describe technical scheme of the present invention rather than the present technique method is limited, the present invention can extend to other modification, variation, application and embodiment on using, and therefore thinks that all such modifications, variation, application, embodiment are in spirit of the present invention and teachings.
Claims (10)
1. a fire emergency lamp comprises one or more LED and control circuit, it is characterized in that:
Described fire emergency lamp also comprises the lithium battery as supplying cell;
Described control circuit comprises master controller and the charge-discharge circuit, signal detection and the ON-OFF control circuit that link to each other with described master controller respectively, duty indication and output circuit;
Described signal detection and ON-OFF control circuit are used for decay and detect line voltage and lithium battery voltage, judge whether load is in normally, short circuit or open-circuit condition, and detection signal is sent to described master controller; Wherein, described signal detection and ON-OFF control circuit comprise by first resistance and the second resistance (R14, R18) series connection constitutes be used to decay first bleeder circuit of line voltage, by the 3rd resistance and the 4th resistance (R25, R49) series connection constitutes be used for to the decay of supplying cell voltage signal and insert master controller second bleeder circuit, by the 5th resistance and the 6th resistance (R2, R20) series connection constitutes is used for the load signal decay and inserts the 3rd bleeder circuit of master controller; Described line voltage inserts master controller, described three bleeder circuit parallel connections after by capacitor filtering;
Described charge-discharge control circuit comprises the charging circuit of the pulse-width modulation circuit with the ripple that is used to adjust the lithium cell charging electric current and reduces lithium cell charging, and is used for by adjusting being connected and the discharge circuit that disconnects to the lithium battery discharge of load;
Described duty indication and output circuit are used to control the duty of described LED;
Described master controller is used for judging by the magnitude of voltage of signal detection and ON-OFF control circuit collection civil power and lithium battery and load the state of current civil power, lithium battery and load, come charging and discharging lithium battery by charge-discharge control circuit, and control LED indication, fault alarm by duty indication and output circuit.
2. fire emergency lamp according to claim 1, it is characterized in that, described fire emergency lamp also comprises power control circuit, and described power control circuit is used to control the electric current one-way transmission of power supply to lithium battery, and is used to described master controller stable power-supplying.
3. fire emergency lamp according to claim 1 is characterized in that, described fire emergency lamp also comprises:
Lamp socket is used for described fire emergency lamp is fixed in illumination or indicating positions;
Lampshade.
4. fire emergency lamp according to claim 1, it is characterized in that, described fire emergency lamp also comprises circuit board, and described one or more LED is arranged in the one side of described circuit board, arranges described lithium battery and described control circuit on the another side of described circuit board.
5. fire emergency lamp according to claim 1 is characterized in that, described signal detection and ON-OFF control circuit also are used to detect button and obtain the manually-operated indication, to open and close described control circuit.
6. fire emergency lamp according to claim 1, it is characterized in that, described master controller starts discharge circuit according to the situation that current line voltage is lower than normal value, and starts charging circuit according to the situation of the normal and current lithium battery needs charging of current line voltage.
7. fire emergency lamp according to claim 1 is characterized in that, described master controller detects described lithium battery open circuit or short circuit, starts failure alarm circuit.
8. fire emergency lamp according to claim 1 is characterized in that, described master controller detects lithium battery and forces down when preset value, start charging circuit and carry out low current charge, wherein, described preset value is 4.05 volts, and described little electric current is 0.1 times of peak point current.
9. fire emergency lamp according to claim 1, it is characterized in that, when described master controller detects lithium battery voltage greater than 2.9V, described charging circuit is to described lithium battery constant-current charge, work as constant-current charge, when lithium battery voltage equals 4.2V, adjust charging current, keep lithium battery voltage and be stabilized in 4.2V by described pulse-width modulation circuit.
10. fire emergency lamp according to claim 1 is characterized in that, in discharge process, the size of described pulse-width modulation circuit control discharge current when lithium battery voltage is higher than 3.2V, reduces discharge current; When lithium battery forces down in 2.9V, improve discharge current, discharge current is consistent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101467833A CN101598287B (en) | 2009-07-03 | 2009-07-03 | Fire-fighting emergency light |
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| CN2009101467833A CN101598287B (en) | 2009-07-03 | 2009-07-03 | Fire-fighting emergency light |
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| CN101598287B true CN101598287B (en) | 2011-02-09 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102761150A (en) * | 2011-04-28 | 2012-10-31 | 刘凤娥 | Improved device of emergency escape indicator light |
| CN102281675B (en) * | 2011-06-02 | 2014-11-26 | 胡兴 | LED patrol lamp control circuit |
| CN102278691A (en) * | 2011-07-29 | 2011-12-14 | 深圳市聚作实业有限公司 | LED (light emitting diode) lamp with storage battery |
| CN103945609B (en) * | 2014-04-21 | 2015-04-15 | 深圳市康铭盛实业有限公司 | Self-starting LED emergency lighting circuit system |
| CN104507196A (en) * | 2014-10-23 | 2015-04-08 | 天津光电华典科技有限公司 | LED fire-fighting emergency lamp control circuit |
| CN106247273B (en) * | 2016-10-21 | 2019-05-28 | 河海大学 | A kind of corridor emergency lighting facility of pressure intelligent power supply |
| CN108633135B (en) * | 2018-04-12 | 2023-12-26 | 常州星宇车灯股份有限公司 | Portable LED tent lamp control circuit |
| CN108834289A (en) * | 2018-08-13 | 2018-11-16 | 东莞启益电器机械有限公司 | A kind of control circuit of Low Power Consumption Portable head lamp with an automatic light meter |
| CN111009946A (en) * | 2019-12-25 | 2020-04-14 | 广东金莱特电器股份有限公司 | Lamp and battery over-discharge control circuit and method |
| CN113301687A (en) * | 2021-06-11 | 2021-08-24 | 乐清市银月光电科技有限公司 | Intelligent fire-fighting emergency controller |
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| CN2686187Y (en) * | 2003-12-17 | 2005-03-16 | 汪宗纯 | Emergency lamp control circuit |
| CN2750551Y (en) * | 2004-07-28 | 2006-01-04 | 深圳市山海太阳能科技有限公司 | Solar accumulator controller |
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| CN101598287A (en) | 2009-12-09 |
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