CN102395235A - Energy saving lamp box control circuit and energy saving lamp box - Google Patents
Energy saving lamp box control circuit and energy saving lamp box Download PDFInfo
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- CN102395235A CN102395235A CN2011103448567A CN201110344856A CN102395235A CN 102395235 A CN102395235 A CN 102395235A CN 2011103448567 A CN2011103448567 A CN 2011103448567A CN 201110344856 A CN201110344856 A CN 201110344856A CN 102395235 A CN102395235 A CN 102395235A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention relates to an energy saving lamp box control circuit which comprises a PWM pulse formation module used for generating a PWM pulse signal and an LED constant current driving module which is controlled by the PWM pulse signal and drives LED operation. The control circuit also comprises an adaptive light modulation module which comprises a first light-sensitive device. The adaptive light modulation module is connected with the PWM pulse formation module and is used for sensing environment light intensity, and generating a light modulation voltage signal to control a duty ratio of the PWM pulse signal generated by the PWM pulse formation module so as to carry out light modulation. In the invention, through additionally adding the adaptive light modulation module, a lamp box has an adaptive light modulation function, the darker an environment, the brighter the lamp box, and vice versa, thus an effect of an advertisement is optimized. The control circuit also has a light control function (when ambient brightness reaches a set value, a lamp box is closed automatically), a sound control function (when ambient sound reaches a set value, the lamp box is lighted) and an LED light decay compensation function.
Description
Technical field
The present invention relates to electric field, more particularly, relate to a kind of energy-saving lamp box control circuit and energy-saving lamp box.
Background technology
Lamp box is a kind of form of media advertisement, though it is concerned by people not as the dynamic advertising that kind, because low preparation cost, area is changeable, and is safe and convenient to use etc., and characteristics make it still obtain using widely.
Lamp box is according to the difference of light source type, can be divided into more early stage fluorescent tube and the EEFL (external electrode fluorescence lamp pipe) that used afterwards and the lamp box of LED (light-emitting diode) light source that progressively rises in recent years.Because LED has the luminous efficiency height, the life-span is long, and energy-conserving and environment-protective and be convenient to realize characteristics such as brilliance control can be caught up from behind it, have much the growth momentum that replaces conventional light source.
Yet conventional lightbank backlight do not possess brightness self adaptation adjustment function.When environment was very bright, the function of also not shutting down automatically was so can consume many electric energy in vain.When light source produces serious light decay because of with the passing of time using, can not carry out luminance compensation to it, to lamp box life-span and effect are had a greatly reduced quality.
Summary of the invention
The technical problem that the present invention will solve is that the defective that does not possess brightness self adaptation adjustment function and waste electric energy backlight to existing lamp box provides a kind of energy-saving lamp box.
The technical solution adopted for the present invention to solve the technical problems is: structure energy-saving lamp box control circuit, comprise the pwm pulse formation module that is used to produce pwm pulse signal, and by the LED constant-current driven module of said pwm pulse signal control with driving LED work; Also comprise:
The self adaptation light-adjusting module; Comprise first light-sensitive device; Said self adaptation light-adjusting module forms module with said pwm pulse and links to each other, and is used for the induced environment light intensity and generates the duty ratio that the dimmer voltage signal is controlled the pwm pulse signal of said pwm pulse formation module generation, and is with an automatic light meter to realize.
In according to energy-saving lamp box control circuit of the present invention; Said energy-saving lamp box control circuit also comprises: the light-operated switch module; Comprise second light-sensitive device; Said light-operated switch module forms module with said pwm pulse and links to each other, is used for producing when environmental light intensity in induction is higher than preset light intensity value the output that light-operated voltage signal turn-offs said pwm pulse formation module.
In according to energy-saving lamp box control circuit of the present invention; Said energy-saving lamp box control circuit also comprises: the audio-switch module; Comprise the sound collection device; Said audio-switch module links to each other with said pwm pulse formation module, is used for when the environment sound intensity of induction is higher than acoustic control startup preset value, producing the acoustic control voltage signal and controls the duty ratio that said pwm pulse forms the pwm pulse signal of module generation.
In according to energy-saving lamp box control circuit of the present invention; Said energy-saving lamp box control circuit also comprises: the light decay compensating module; Comprise slide resistor R6; Said light decay compensating module is used for regulating the dimmer voltage signal magnitude that said self adaptation light-adjusting module produces according to the change in resistance of said slide resistor R6, and then controls duty ratio that said pwm pulse forms the pwm pulse signal that module produces to realize the compensation of LED light decay.
In according to energy-saving lamp box control circuit of the present invention; Said energy-saving lamp box control circuit also comprises: switch power module; The input of said switch power module is connected with electric main, and output produces direct-current working volts and forms module, LED constant-current driven module, self adaptation light-adjusting module, light-operated switch module and acoustic control switch module for said pwm pulse.
In according to energy-saving lamp box control circuit of the present invention; Said self adaptation light-adjusting module comprises first light-sensitive device, resistance R 4, resistance R 3 and slide resistor R6 at least; Said resistance R 4 and slide resistor R6 are connected between direct-current working volts and the ground; Be connected in parallel on slide resistor R6 two ends after said first light-sensitive device and resistance R 3 series connection, the node that is pressed between resistance R 4 and the slide resistor R6 through common branch produces the output of dimmer voltage signal.
In according to energy-saving lamp box control circuit of the present invention; Said pwm pulse forms module and comprises switching tube Q2 and double operational IC2 at least; The base stage of said switching tube Q2 is connected to the output of self adaptation light-adjusting module; And the collector electrode of said switching tube Q2 connects direct-current working volts, and emitter is through resistance R 5 ground connection; Resistance R 7 and resistance R 8 are connected on carries out dividing potential drop between direct-current working volts and the ground; And the first amplifier positive input (the 3rd pin) of said double operational IC2 is connected to the node between said resistance R 7 and the resistance R 8; The said first amplifier reverse input end (the 2nd pin) is connected to the first amplifier output (the 1st pin) through resistance R 10; The said first amplifier output (the 1st pin) is connected to the said first amplifier positive input (the 3rd pin) through resistance R 9; The said first amplifier reverse input end (the 2nd pin) is also through capacitor C 4 ground connection; The said first amplifier reverse input end (the 2nd pin) is connected to the second amplifier positive input (the 5th pin) of said double operational IC2; The second amplifier reverse input end (the 6th pin) of said double operational IC2 is connected to the emitter of said switching tube Q2, and the second amplifier output (the 7th pin) forms module output output pwm pulse signal as said pwm pulse.
In according to energy-saving lamp box control circuit of the present invention; Said light-controlled switching circuit comprises second light-sensitive device, Schmidt trigger IC1 and switching tube Q1 at least; And said second light-sensitive device, slide resistor R2 and resistance R 1 are connected on carries out dividing potential drop between direct-current working volts and the ground; And export trigger end (the 2nd pin) and the thresholding end (the 6th pin) of said Schmidt trigger IC1 to through the node between slide resistor R2 and the resistance R 1; And the output of said Schmidt trigger IC1 (the 3rd pin) exports said switching tube Q1 base stage to; Said switching tube Q1 grounded emitter, collector electrode are connected to the second amplifier positive input (the 5th pin) that said pwm pulse forms double operational IC2 described in the module.
In according to energy-saving lamp box control circuit of the present invention, said audio-switch module comprises:
The double note amplifier unit is connected with said sound collection device, is used for the audio signal of gathering is amplified;
The voltage multiplying rectifier unit is connected with said double note amplifier unit, is used for the audio signal after amplifying is become direct current signal;
The direct current amplifying unit is connected with said voltage multiplying rectifier unit, is used for direct current signal is amplified;
Monostable trigger element is connected with said direct current amplifying unit, is used for when reaching preset value, exporting triggering signal according to the direct current signal after amplifying;
Partial pressure unit is connected with said monostable trigger element, is used for carrying out dividing potential drop output acoustic control voltage signal according to said triggering signal, and the output of said partial pressure unit is connected to the base stage that said pwm pulse forms the switching tube Q2 of module through the diode D3 of reversal connection.
In according to energy-saving lamp box control circuit of the present invention; Said light decay compensating module; Comprise said slide resistor R6 and said switching tube Q2; Said slide resistor R6 is connected between the base stage and ground of said switching tube Q2, and the resistance of slide resistor R6 is turned down to reduce said dimmer voltage signal magnitude, makes the emitter of switching tube Q2 export the voltage reduction of the second amplifier reverse input end (the 6th pin) of said double operational IC2 to; Thereby make the accounting for of pwm pulse of the second amplifier output (the 7th pin) output of double operational IC2 control than increase, reach the purpose that promotes brightness.
The present invention also provides a kind of energy-saving lamp box control circuit, comprises the pwm pulse formation module that is used to produce pwm pulse signal, and by the LED constant-current driven module of said pwm pulse signal control with driving LED work; Also comprise:
The self adaptation light-adjusting module; Comprise first light-sensitive device; Said self adaptation light-adjusting module forms module with said pwm pulse and links to each other, and is used for the induced environment light intensity and generates the duty ratio that the dimmer voltage signal is controlled the pwm pulse signal of said pwm pulse formation module generation, and is with an automatic light meter to realize;
The light-operated switch module comprises second light-sensitive device, and said light-operated switch module forms module with said pwm pulse and links to each other, is used for producing when environmental light intensity in induction is higher than preset light intensity value the output that light-operated voltage signal turn-offs said pwm pulse formation module;
The audio-switch module; Comprise the sound collection device; Said audio-switch module links to each other with said pwm pulse formation module, is used for when the environment sound intensity of induction is higher than acoustic control startup preset value, producing the acoustic control voltage signal and controls the duty ratio that said pwm pulse forms the pwm pulse signal of module generation;
The light decay compensating module; Comprise slide resistor R6; Said light decay compensating module is used for regulating the dimmer voltage signal magnitude that said self adaptation light-adjusting module produces according to the change in resistance of said slide resistor R6, and then controls duty ratio that said pwm pulse forms the pwm pulse signal that module produces to realize the compensation of LED light decay.
The present invention also provides a kind of energy-saving lamp box, comprises aforesaid energy-saving lamp box control circuit.
The energy-saving lamp box control circuit and the energy-saving lamp box of embodiment of the present invention; Have following beneficial effect: the present invention is through setting up the self adaptation light-adjusting module; But the induced environment light intensity generates the luminous intensity that the dimmer voltage signal is controlled LED, makes lamp box have the self adaptation dimming function, and lamp box is also bright more when environment is bright more; Otherwise dark more, make advertising effect reach best.
In addition, the present invention also can further set up light-operated switch module, audio-switch module and/or light decay compensating module, makes that lamp box can be when environmental light intensity reaches the highest light intensity preset value of setting, and backlight will closing automatically realized energy-conservation; When the environment sound intensity reaches preset value, lamp box is brightened automatically; After the long-time use of LED, through the operating state of adjusting LED lamp box brightness is compensated, therefore can prolong the useful life of lamp box greatly, reach the purpose of reducing investment outlay.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the module diagram according to energy-saving lamp box control circuit in the preferred embodiment of the present invention;
Fig. 2 is the circuit theory diagrams that pwm pulse forms module among Fig. 1;
Fig. 3 forms the input and output oscillogram of double operational IC2 in the module for pwm pulse;
Fig. 4 is the circuit theory diagrams of LED constant-current driven module among Fig. 1;
Fig. 5 is the circuit theory diagrams of self adaptation light-adjusting module and light-operated switch module among Fig. 1;
Fig. 6 is the circuit theory diagrams of audio-switch module among Fig. 1.
Embodiment
For make the object of the invention, technical scheme and advantage clear more bright from, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.
In view of the problem that conventional lightbank exists, the present invention's design and realized a kind of brand-new be multifunction energy-saving lamp box and its control circuit of light source with LED.This energy-saving lamp box also has the characteristics of ambient light adaptive light modulation except adopting LED self than the superior performance of fluorescent tube on application function.Further, this energy-saving lamp box can also have light-operated switch function, audio-switch function and light decay compensate function etc.
See also Fig. 1, be module diagram according to energy-saving lamp box control circuit in the preferred embodiment of the present invention.As shown in Figure 1, the energy-saving lamp box control circuit that this embodiment provides comprises at least: pwm pulse forms module 20 and LED constant-current driven module 30.
Wherein, pwm pulse forms module 20 and is used to produce pwm pulse signal, and LED constant-current driven module 30 is attached thereto, and is worked to drive load LED by said pwm pulse signal control.In some other embodiment of the present invention, pwm pulse forms module 20 and can directly be supplied power by D.C. regulated power supply with LED constant-current driven module 30.And at present embodiment; This energy-saving lamp box control circuit also further comprises switch power module 10; The input of this switch power module 10 is connected with electric main, and output produces direct-current working volts and gives other module for power supply, forms module 20 and LED constant-current driven module 30 like pwm pulse.
Energy-saving lamp box control circuit of the present invention also further comprises self adaptation light-adjusting module 40; This self adaptation light-adjusting module 40 has first light-sensitive device; And form module 20 with pwm pulse and link to each other; Be used for generating the dimmer voltage signal, and control the duty ratio that pwm pulse forms the pwm pulse signal of module 20 generations through this dimmer voltage signal through the first light-sensitive device induced environment light intensity, thus the luminosity of regulating load LED.
Energy-saving lamp box control circuit of the present invention can also further optionally comprise light-operated switch module 50; This light-operated switch module 50 has second light-sensitive device; And forming module 20 with pwm pulse links to each other; Be used for producing light-operated voltage signal when environmental light intensity in induction is higher than preset light intensity value, and turn-off the output that pwm pulse forms the pwm pulse signal of module 20 through this light-operated voltage signal.
Energy-saving lamp box control circuit of the present invention can further include audio-switch module 60, and this audio-switch module 60 comprises the sound collection device, the for example external polar body microphone that gathers.This audio-switch module 60 forms module 20 with pwm pulse and links to each other; Be used for when the environment sound intensity of sound collection device induction is higher than acoustic control startup preset value, producing the acoustic control voltage signal; And export this acoustic control voltage signal and control the duty ratio that pwm pulse forms the pwm pulse signal of module 20 generations, thereby regulate the luminosity of LED.
Energy-saving lamp box control circuit of the present invention can also further optionally comprise light decay compensating module 70; It comprises slide resistor; This light decay compensating module 70 is used for regulating the dimmer voltage signal magnitude that self adaptation light-adjusting module 40 produces according to the change in resistance of slide resistor; And then the duty ratio of the pwm pulse signal of control pwm pulse formation module generation, to realize the compensation of LED light decay.Above-mentioned each module equally can be by switch power module 10 power supplies.
Concrete composition and circuit theory in the face of each functional module of the present invention describes down.
1, switch power module 10
This switch power module 10 can adopt those skilled in the art to know and applicable any Switching Power Supply realizes; It can convert the electric main of 220V into galvanic current and press output, for example provides the 5V direct-current working volts to form module 20, self adaptation light-adjusting module 40, light-operated switch module 50, audio-switch module 60 and light decay compensating module 70 to pwm pulse.In addition, can also further provide the 12V direct-current working volts to use to LED constant-current driven module 30.
2, pwm pulse forms module 20
See also Fig. 2, form the circuit theory diagrams of module 20 for pwm pulse among Fig. 1.As shown in Figure 2, pwm pulse forms module 20 and comprises switching tube Q2 and double operational IC2 at least, and the device of periphery, like resistance R 5, R7, R8, R9, R10, and capacitor C 3 and C4.In the present embodiment, can to adopt model be that the chip of TLC2272CD is realized to double operational IC2.
The base stage B of switching tube Q2 is connected to the output of self adaptation light-adjusting module 40, to receive the dimmer voltage signal.The collector electrode of switching tube Q2 meets direct-current working volts 5V, and emitter is through resistance R 5 ground connection, and emitter is also through capacitor C 3 ground connection.
First amplifier of double operational IC2 constitutes the oscillator that frequency of oscillation is about 100Hz.Resistance R 7 and resistance R 8 are connected on carries out dividing potential drop between direct-current working volts and the ground; Node between resistance R 7 and the resistance R 8 is connected to the first amplifier positive input (the 3rd pin) of double operational IC2; Be connected with resistance R 10 between first amplifier reverse input end (the 2nd pin) and the first amplifier output (the 1st pin); Be connected with resistance R 9, the first amplifier reverse input ends (the 2nd pin) between first amplifier output (the 1st pin) and the first amplifier positive input (the 3rd pin) also through capacitor C 4 ground connection.The first amplifier reverse input end (the 2nd pin) is connected to the second amplifier positive input (the 5th pin) of double operational IC2.Therefore, the frequency of oscillation that produces of first amplifier is about the integrating circuit that the pulse of 100Hz forms through resistance R 10 and capacitor C 4 and forms sawtooth waveforms and be added to the second amplifier positive input (the 5th pin).
The second amplifier reverse input end (the 6th pin) of double operational IC2 is connected to the emitter of said switching tube Q2, and the second amplifier output (the 7th pin) forms module 20 outputs as pwm pulse.The direct voltage that is made up of switching tube Q2 and peripheral resistance forms the direct voltage that circuit produces and then is added to this second amplifier reverse input end (the 6th pin); So, will produce and the corresponding pwm pulse signal of input terminal voltage difference at this second amplifier output (the 7th pin).When the dc voltage change of switching tube Q2 output; Because the relative difference of it and sawtooth waveforms also can change; The duty ratio of this just feasible output pwm pulse signal is also followed and is changed, thereby has changed the ON time of load LED, and lamp box brightness backlight will produce corresponding variation.The variation of being controlled the pwm pulse signal duty ratio of exporting by direct voltage is as shown in Figure 3; Wherein sawtooth waveforms is the waveform of the second amplifier positive input (the 5th pin) of double operational IC2 among the 3-A, and V1 or V2 are respectively the second amplifier reverse input end (the 6th pin) that is applied to of switching tube Q2 and the generation of peripheral resistance.3-B is corresponding to the second amplifier reverse input end (the 6th pin) when output voltage is V2, the oscillogram of the pwm pulse signal of the second amplifier output (the 7th pin) output.3-C is corresponding to the second amplifier reverse input end (the 6th pin) when output voltage is V1, the oscillogram of the pwm pulse signal of the second amplifier output (the 7th pin) output.
Can know that by Fig. 3 when V1 voltage ratio V2 was high, the pulse duration of corresponding pwm pulse signal from the second amplifier output (the 7th pin) output was just narrow.Therefore the present invention only need change the direct voltage on the second amplifier reverse input end (the 6th pin) of double operational IC2 in the foregoing circuit, just can reach the purpose that the pwm pulse duty ratio that makes output is followed variation.
In addition, the 12V that also shows among Fig. 2 by switch power module 10 outputs is added to voltage stabilizing chip IC 3 through the 1st pin and the 2nd pin of connector J1, is used for the 5V voltage that output after the input voltage step-down of 12V is stable, as the supply voltage in the control circuit.The required power supply of LED is then directly provided by the 12V of switch power module 10 outputs.In the present embodiment, these voltage stabilizing chip IC 3 employing models are the chip realization of 78M05.
3, the LED constant-current driven module 30
See also Fig. 4, be the circuit theory diagrams of LED constant-current driven module 30 among Fig. 1.As shown in Figure 4, the present invention adopts conventional constant-current drive circuit, for example adopts constant-current driven chip to realize, can adopt model in the present embodiment is that the chip of DW8502 is that LED drives.Wherein, the positive supply input VDD (the 1st pin) of constant-current driven chip IC7 is connected to the direct-current working volts positive pole, like 12V.The electric current of constant-current driven chip IC7 is provided with end ISET (the 2nd pin) through resistance R e ground connection, should be to earth resistance Re in order to regulate the maximum output current value of this constant-current driven chip IC7.When regulating, should also can realize that current stabilization is a principle to guarantee the load current value that is no more than this device.The output OUT of constant-current driven chip IC7 (the 5th pin) connects the negative electrode of load LED, and the anode of LED connects direct-current working volts.The output enable end OE (the 4th pin) of constant-current driven chip IC7 is used to receive pwm pulse and forms the pwm pulse signal that module 20 generates, and for example is connected to the 4th pin of connector J1 among Fig. 2, and then is connected with the second amplifier output (the 7th pin) of double operational IC2.
During operate as normal, the size of current of the output OUT of constant-current driven chip IC7 (the 5th pin) output is to be decided by the duty ratio that is added in the pwm pulse signal on the output enable end OE (the 4th pin).
4, the self adaptation light-adjusting module 40
See also Fig. 5, be the circuit theory diagrams of self adaptation light-adjusting module among Fig. 1 40 and light-operated switch module 50.As shown in Figure 5, self adaptation light-adjusting module 40 comprises first light-sensitive device and resistance R 4 at least.Wherein first light-sensitive device for example photo resistance through connector J4 place in circuit.Be attempted by on the contact of the bleeder circuit of being formed by resistance R 4 and slide resistor R6 after first light-sensitive device and resistance R 3 series connection, determine the bias voltage of Q2 jointly.Node between resistance R 4 and the resistance R 6 is connected to the base stage B that pwm pulse forms the switching tube Q2 of module 20 as the output of self adaptation light-adjusting module 40.
The resistance that first light-sensitive device is appeared changes with environmental light intensity.Because the resistance variations of different caused first light-sensitive devices of illumination will make the resistance value of the output of self adaptation light-adjusting module 40 change; And then make the bias voltage of base stage of switching tube Q2 that corresponding the variation taken place; Just can control double operational IC2 output duty of ratio from the emitter output back of switching tube Q2, thereby reach the purpose of control lamp box backlight illumination.
When environment was bright more, the resistance value that first light-sensitive device is appeared was more little.The resistance of the output of self adaptation light-adjusting module 40 is low more; The bias voltage of the base stage B of switching tube Q2 is also low more; The direct voltage that the emitter of switching tube Q2 is applied to the second amplifier reverse input end (the 6th pin) is also low more, and is as shown in Figure 3, just wide more from the pulse duration of the pwm pulse signal of the second amplifier output (the 7th pin) output; The electric current of constant-current driven chip IC7 output is big more, and LED is bright more.When environment is darker, The above results in contrast, LED is dark more, makes the advertising results of lamp box reach best.
5, light-controlled switching circuit 50
In Fig. 5, light-controlled switching circuit 50 comprises second light-sensitive device, Schmidt trigger IC1 and switching tube Q1 at least.Wherein, second light-sensitive device is through connector J3 place in circuit, and second light-sensitive device and slide resistor R2 series connection back constitute bleeder circuit with R1.
Schmidt trigger IC1 preferably adopts 555 integrated circuits to realize, utilizes resetting and the set characteristic of its inner two comparators, just can constitute Schmidt trigger.The trigger end of Schmidt trigger IC1 (the 2nd pin) and thresholding end (the 6th pin) all are connected in the bleeder circuit that resistance R 1 and slide resistor R2 and second light-sensitive device constituted.And the output of Schmidt trigger IC1 (the 3rd pin) exports said switching tube Q1 base stage to.Switching tube Q1 grounded emitter, collector electrode are connected to the second amplifier positive input (the 5th pin) that said pwm pulse forms double operational IC2 in the module.
When surround lighting is dark; Second light-sensitive device presents higher resistance; When the level of the trigger end (the 2nd pin) of Schmidt trigger IC1 and thresholding end (the 6th pin) was higher than the 2/3VCC threshold level, Schmidt trigger IC1 was in reset mode, and output (the 3rd pin) is output as low level; This moment, switching tube Q1 was an off-state, did not influence original operating state of double operational IC2.
Otherwise when environmental light intensity is high during to preset light intensity value, the resistance of second light-sensitive device descends, and can make the level decline of trigger end (the 2nd pin) and thresholding end (the 6th pin) of Schmidt trigger IC1.When the triggering level that drops to less than 1/3VCC; Schmidt trigger IC1 just is set, output (the 3rd pin) output high level, switching tube Q1 saturation conduction; The voltage of the second amplifier positive input (the 5th pin) of double operational IC2 is reduced near 0V; From the output of the second amplifier output (the 7th pin) is 0V also, thereby has turn-offed the output of pwm pulse signal, and LED-backlit turn-offs.
In this circuit, change the highest light intensity preset value of light-operated switch through the big I of adjustment resistance R 2.
6, the audio-switch module 60
See also Fig. 6, be the circuit theory diagrams of audio-switch module 60 among Fig. 1.As shown in Figure 6, this audio-switch module 60 comprises successively and to connect: sound collection device, double note amplifier unit, voltage multiplying rectifier unit, direct current amplifying unit, monostable trigger element and partial pressure unit.
Wherein, the sound collection device can adopt the external polar body microphone that gathers, and J5 is connected into circuit through connector, and double operational IC4 and peripheral devices are formed double note amplifier, are connected with the sound collection device, is used for the audio signal of gathering is amplified.Diode D1 and diode D2 constitute voltage doubling rectifing circuit, are used for the audio signal after amplifying is become direct current.The plus earth of diode D1, negative electrode are connected to the second amplifier output (the 7th pin) of double operational IC4 through capacitor C 11.The anode of diode D2 also is connected to the second amplifier output (the 7th pin) of double operational IC4, and the negative electrode of diode D2 exports the direct current amplifying unit to.The direct current amplifying unit is made up of switching tube Q3 and resistance R 21, and the base stage of switching tube Q3 is connected to the negative electrode of diode D2, and the collector electrode of switching tube Q3 connects the 5V direct-current working volts through resistance R 21.The grounded emitter of switching tube Q3.The collector electrode of switching tube Q3 is exported the direct current signal after amplifying, and delivers to the trigger end (the 2nd pin) of monostable flip chip IC5.Monostable flip chip IC5 adopts 555 integrated circuits to realize in the present embodiment, is connected into single-shot trigger trigger, is used for when reaching preset value, exporting triggering signal according to the direct current audio signal after amplifying.The threshold voltage end of monostable flip chip IC5 (the 6th pin) and discharge end (the 7th pin) link to each other and with resistance R 26, resistance R 24 and capacitor C 13 are formed delay circuits.Adjust their numerical value, can change the time of monostable time-delay, thereby the may command lamp box adds the bright time.Can adopt model with non-chip IC 6 is the chip realization of 74LS00.The output of monostable flip chip IC5 (the 3rd pin) is connected to the input (the 1st pin) with non-chip IC 6; The resistance R 27 and resistance R 28 ground connection of NAND gate output (the 3rd pin) with non-chip IC 6 through connecting; Resistance R 27 is formed partial pressure unit with resistance R 28, the acoustic control voltage signal after the dividing potential drop is connected to the base stage of the switching tube Q2 of pwm pulse formation module through the diode D3 of reversal connection.
When in the environment sound being arranged, switching tube Q3 is by saturation conduction, and monostable flip chip IC5 is set, and the output of monostable flip chip IC5 (the 3rd pin) is output as high level, through with non-chip IC 6 paraphase after become electronegative potential.This low level makes the second amplifier reverse input end (the 6th pin) of double operational IC2 also become low level through the base stage that isolating diode D3 is added to switching tube Q2.As can beappreciated from fig. 3, behind the 6th pin current potential step-down, will increase from the duty ratio of the pwm pulse signal of double operational IC2 output, thereby can make lamp box light.For the brightness after lamp box is lighted meets design requirement, the bleeder circuit that constitutes through resistance R 27 and resistance R 28 with the NAND gate output (the 3rd pin) of non-chip IC 6 is in order to set the brightness behind the bright lamp.
When in the environment when noiseless, be output as high potential with non-chip IC 6, because the buffer action of diode D3, this high potential can not have influence on the normal dimming function of double operational IC2.
7, the light decay compensating module 70
Please consult Fig. 5 again, light decay compensating module 70 comprises slide resistor R6 and said switching tube Q2 at least.Slide resistor R6 is connected between the base stage and ground of switching tube Q2; When needs improve brightness; As long as the resistance of this slide resistor R6 is reduced; The bias voltage that is applied to the base stage B of switching tube Q2 diminishes, and makes the emitter of switching tube Q2 export the voltage reduction of the second amplifier reverse input end (the 6th pin) of said double operational IC2 to.As shown in Figure 3, when voltage decreases, the duty ratio of the pwm pulse signal of output increases, and therefore can make the brightness of LED be returned to previous level.
In existing lamp box is backlight, no matter be lamp tube light source or led light source, all it is applied in the full power state.Such design can make the life-span of light source have a greatly reduced quality, and uses less than will change backlight one or two years comprehensively.In the present invention, in order to prolong the life-span backlight, the power of LED and corresponding component when dispatching from the factory (LED constant-current driving IC, Switching Power Supply) all is set in the 50-60% of these devices or parts rated power.The design of this big amount of redundancy can prolong the useful life of LED effectively.Even like this, LED still can produce light decay after having used several years.But, can realize compensation easily to the LED light decay so circuit parameter can be changed through method as above because corresponding each device and parts all have very big amount of redundancy.
In a preferred embodiment of the invention; Energy-saving lamp box control circuit provided by the invention and lamp box can comprise above-mentioned all functions simultaneously, and promptly the energy-saving lamp box control circuit comprises as implied above at least: pwm pulse forms module 20, LED constant-current driven module 30, self adaptation light-adjusting module 40, light-operated switch module 50, audio-switch module 60 and light decay compensating module 70.This energy-saving lamp box becomes the abundant and good multi-functional lamp box of performance of a kind of product function.
The corresponding energy-saving lamp box that adopts above-mentioned energy-saving lamp box control circuit that provides of the present invention.This lamp box adopts above-mentioned energy-saving lamp box control circuit control load LED luminous.This lamp box except LED self than the superior performance of fluorescent tube, on application function, can also have following characteristics:
1, self adaptation dimming function: when environmental light intensity is in normal range (NR), entering brightness adaptive model backlight.Environment is bright more, and lamp box is also bright more; Otherwise environment is dark more, and lamp box is also dark more.Make the advertising results of lamp box reach best.
2, light-operated switch function: when environmental light intensity reached the highest light intensity preset value of setting, backlight will closing automatically realized energy-conservation.
3, the acoustic control function of opening the light: when environmental light intensity is dark, after lamp box brightness reduces automatically, if people or vehicle are arranged near lamp box, lamp box will collect the variation of the environment sound intensity, and lamp box can brighten automatically; Otherwise be returned to low bright state again.This function is specially adapted to the application of lamp box in the occasions such as garage.
4, light decay compensate function: when LED after long-time the use because the LED light decay is when reducing lamp box brightness, can be easily operating state through adjustment LED lamp box brightness is compensated.Therefore can prolong the useful life of lamp box greatly, reach the purpose of reducing investment outlay.
The present invention describes according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the scope of the invention, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion or the material of the present invention's technology, can carry out many modifications and not break away from its protection range the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.
Claims (12)
1. an energy-saving lamp box control circuit comprises the pwm pulse formation module that is used to produce pwm pulse signal, and by the LED constant-current driven module of said pwm pulse signal control with driving LED work; It is characterized in that, also comprise:
The self adaptation light-adjusting module; Comprise first light-sensitive device; Said self adaptation light-adjusting module forms module with said pwm pulse and links to each other, and is used for the induced environment light intensity and generates the duty ratio that the dimmer voltage signal is controlled the pwm pulse signal of said pwm pulse formation module generation, and is with an automatic light meter to realize.
2. energy-saving lamp box control circuit according to claim 1 is characterized in that, said energy-saving lamp box control circuit also comprises:
The light-operated switch module comprises second light-sensitive device, and said light-operated switch module forms module with said pwm pulse and links to each other, is used for producing when environmental light intensity in induction is higher than preset light intensity value the output that light-operated voltage signal turn-offs said pwm pulse formation module.
3. energy-saving lamp box control circuit according to claim 1 and 2 is characterized in that, said energy-saving lamp box control circuit also comprises:
The audio-switch module; Comprise the sound collection device; Said audio-switch module links to each other with said pwm pulse formation module, is used for when the environment sound intensity of induction is higher than acoustic control startup preset value, producing the acoustic control voltage signal and controls the duty ratio that said pwm pulse forms the pwm pulse signal of module generation.
4. energy-saving lamp box control circuit according to claim 1 and 2 is characterized in that, said energy-saving lamp box control circuit also comprises:
The light decay compensating module; Comprise slide resistor R6; Said light decay compensating module is used for regulating the dimmer voltage signal magnitude that said self adaptation light-adjusting module produces according to the change in resistance of said slide resistor R6, and then controls duty ratio that said pwm pulse forms the pwm pulse signal that module produces to realize the compensation of LED light decay.
5. energy-saving lamp box control circuit according to claim 3 is characterized in that, said energy-saving lamp box control circuit also comprises:
Switch power module, the input of said switch power module is connected with electric main, and output produces direct-current working volts and forms module, LED constant-current driven module, self adaptation light-adjusting module, light-operated switch module and acoustic control switch module for said pwm pulse.
6. energy-saving lamp box control circuit according to claim 4; It is characterized in that; Said self adaptation light-adjusting module comprises first light-sensitive device, resistance R 4, resistance R 3 and slide resistor R6 at least; Said resistance R 4 and slide resistor R6 are connected between direct-current working volts and the ground, are connected in parallel on slide resistor R6 two ends after said first light-sensitive device and resistance R 3 series connection, and the node that is pressed between resistance R 4 and the slide resistor R6 through common branch produces the output of dimmer voltage signal.
7. energy-saving lamp box control circuit according to claim 4; It is characterized in that; Said pwm pulse forms module and comprises switching tube Q2 and double operational IC2 at least; The base stage of said switching tube Q2 is connected to the output of self adaptation light-adjusting module, and the collector electrode of said switching tube Q2 connects direct-current working volts, and emitter is through resistance R 5 ground connection;
Resistance R 7 and resistance R 8 are connected on carries out dividing potential drop between direct-current working volts and the ground; And the first amplifier positive input (the 3rd pin) of said double operational IC2 is connected to the node between said resistance R 7 and the resistance R 8; The said first amplifier reverse input end (the 2nd pin) is connected to the first amplifier output (the 1st pin) through resistance R 10; The said first amplifier output (the 1st pin) is connected to the said first amplifier positive input (the 3rd pin) through resistance R 9; The said first amplifier reverse input end (the 2nd pin) is also through capacitor C 4 ground connection; The said first amplifier reverse input end (the 2nd pin) is connected to the second amplifier positive input (the 5th pin) of said double operational IC2; The second amplifier reverse input end (the 6th pin) of said double operational IC2 is connected to the emitter of said switching tube Q2, and the second amplifier output (the 7th pin) forms module output output pwm pulse signal as said pwm pulse.
8. energy-saving lamp box control circuit according to claim 7; It is characterized in that; Said light-controlled switching circuit comprises second light-sensitive device, Schmidt trigger IC1 and switching tube Q1 at least; And said second light-sensitive device, slide resistor R2 and resistance R 1 are connected on carries out dividing potential drop between direct-current working volts and the ground; And export trigger end (the 2nd pin) and the thresholding end (the 6th pin) of said Schmidt trigger IC1 to through the node between slide resistor R2 and the resistance R 1; And the output of said Schmidt trigger IC1 (the 3rd pin) exports said switching tube Q1 base stage to, said switching tube Q1 grounded emitter, and collector electrode is connected to the second amplifier positive input (the 5th pin) that said pwm pulse forms double operational IC2 described in the module.
9. energy-saving lamp box control circuit according to claim 8 is characterized in that, said audio-switch module comprises:
The double note amplifier unit is connected with said sound collection device, is used for the audio signal of gathering is amplified;
The voltage multiplying rectifier unit is connected with said double note amplifier unit, is used for the audio signal after amplifying is become direct current signal;
The direct current amplifying unit is connected with said voltage multiplying rectifier unit, is used for direct current signal is amplified;
Monostable trigger element is connected with said direct current amplifying unit, is used for when reaching preset value, exporting triggering signal according to the direct current signal after amplifying;
Partial pressure unit is connected with said monostable trigger element, is used for carrying out dividing potential drop output acoustic control voltage signal according to said triggering signal, and the output of said partial pressure unit is connected to the base stage that said pwm pulse forms the switching tube Q2 of module through the diode D3 of reversal connection.
10. energy-saving lamp box control circuit according to claim 8; It is characterized in that; Said light decay compensating module comprises said slide resistor R6 and said switching tube Q2, and said slide resistor R6 is connected between the base stage and ground of said switching tube Q2; The resistance of slide resistor R6 is turned down to reduce said dimmer voltage signal magnitude; Make the emitter of switching tube Q2 export the voltage reduction of the second amplifier reverse input end (the 6th pin) of said double operational IC2 to, make the accounting for of pwm pulse of the second amplifier output (the 7th pin) output of double operational IC2 control than increase then, reach the purpose of lifting brightness.
11. an energy-saving lamp box control circuit comprises the pwm pulse formation module that is used to produce pwm pulse signal, and by the LED constant-current driven module of said pwm pulse signal control with driving LED work; It is characterized in that, also comprise:
The self adaptation light-adjusting module; Comprise first light-sensitive device; Said self adaptation light-adjusting module forms module with said pwm pulse and links to each other, and is used for the induced environment light intensity and generates the duty ratio that the dimmer voltage signal is controlled the pwm pulse signal of said pwm pulse formation module generation, and is with an automatic light meter to realize;
The light-operated switch module comprises second light-sensitive device, and said light-operated switch module forms module with said pwm pulse and links to each other, is used for producing when environmental light intensity in induction is higher than preset light intensity value the output that light-operated voltage signal turn-offs said pwm pulse formation module;
The audio-switch module; Comprise the sound collection device; Said audio-switch module links to each other with said pwm pulse formation module, is used for when the environment sound intensity of induction is higher than acoustic control startup preset value, producing the acoustic control voltage signal and controls the duty ratio that said pwm pulse forms the pwm pulse signal of module generation;
The light decay compensating module; Comprise slide resistor R6; Said light decay compensating module is used for regulating the dimmer voltage signal magnitude that said self adaptation light-adjusting module produces according to the change in resistance of said slide resistor R6, and then controls duty ratio that said pwm pulse forms the pwm pulse signal that module produces to realize the compensation of LED light decay.
12. an energy-saving lamp box is characterized in that, comprises any described energy-saving lamp box control circuit among the claim 1-10.
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| CN2011103448567A CN102395235A (en) | 2011-11-04 | 2011-11-04 | Energy saving lamp box control circuit and energy saving lamp box |
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Application publication date: 20120328 |