CN104244519A - LED sound-control and light-control switching circuit - Google Patents
LED sound-control and light-control switching circuit Download PDFInfo
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Abstract
The invention relates to an LED sound-control and light-control switching circuit. The switching circuit comprises a sound-control circuit, a light-control circuit, a delay control circuit, a rectifier BR and a voltage-stabilizing filter circuit. The sound-control circuit comprises a microphone B and a positive feedback type audio amplifier. By additionally arranging the positive feedback type audio amplifier, the discrimination degree of sound is substantially increased, and control accuracy is substantially improved. The output end of the sound-control circuit is connected into the light-control circuit; in strong light, a photoresistor RG and a crystal triode in the light-control circuit block an audio signal input from the sound-control circuit, in this way, the rectifier BR and an LED drive circuit RL will not be connected no matter how loud the sound is, and an LED lamp will not light up; in weak light, the rectifier BR will be connected as long as the sound of footsteps or the sound of conversation or the like exists, the LED drive circuit RL enters a normal working state, and the LED lamp lights up. Sound control and light control are quite stable, and the combined application of the sound control and the light control is really achieved.
Description
Technical field
The present invention relates to a kind of LED switch circuit, particularly relate to a kind of LED voice control light-controlled switching circuit.
Background technology
Along with the development of modern science and technology, the articles for daily use of people all constantly move towards automation, the stair light that such as people often see, stair light is, by acoustic control microphone, induction sound is sent to amplifying circuit, make electronic circuit produce pulse current, make stair light luminous, after sound disappears, the pulse current that electronic circuit produces disappears, and stair light is with regard to automatic distinguishing.This acoustic control stair light can only be in two states, extinguish, luminous, using function is single, street lamp, forever light modulation and color lamp etc. can not be applied in, street lamp needs a kind of acousto-optic inductor can responded to dark and then make LED shinny, and color lamp needs the controller adopting the lamp of different colours and control different colours etc. luminous.
In order to address the aforementioned drawbacks, be in the Chinese invention patent application of 201310029237.8 at application number, disclose a kind of sound light control circuit, comprise power supply, sound-optical controller, some LED and switch control panel, described power supply is electrically connected with described sound-optical controller, the output circuit of described sound-optical controller is electrically connected with described LED, the shell of described sound-optical controller is provided with switch control panel, the surface of described switch control panel is provided with photodiode and acoustic control microphone, described photodiode and described acoustic control microphone are all electrically connected with described sound-optical controller.In this application, further disclose sound-optical controller and comprise intelligent-induction circuit, function conversion circuit, control circuit and amplifying circuit, described intelligent-induction circuit and described control circuit are electrically connected with described function conversion circuit by described amplifying circuit.Wherein, intelligent-induction circuit comprises triode Q1, triode Q2, electric capacity C1, electric capacity C2, electric capacity C4, resistance R1, resistance R2, resistance R3, resistance R6 and resistance R7, described resistance R1, resistance R2, resistance R3, resistance R6 and resistance R7 is connected in parallel on power circuit, described photodiode is connected with described resistance R1, described acoustic control microphone is connected with described resistance R2, a pin of described electric capacity C1 is connected with one end of described photodiode, another pin of described electric capacity C1 is connected with one end of described acoustic control microphone, the collector electrode of described triode Q1 is connected with a pin of described electric capacity C1, the collector electrode of described triode Q1 is connected with one end of described electric capacity C1, the base stage of described triode Q1 is connected with described resistance R3, the grounded emitter of described triode Q1.Wherein, function conversion circuit comprises a chip IC 1, triode Q3, triode Q4, triode Q5, electric capacity C3, resistance R4 and resistance R5, one end of described resistance R5 is connected with the first pin U1 of described chip IC 1, the other end is connected with the base stage of described triode Q5, one end of described resistance R4 is connected with the second pin U2 of described chip IC 1, and the other end is connected with the base stage of described triode Q4.
Above-mentioned application number is in the patent application of 201310029237.8, by photodiode and acoustic control microphone, the sound wave of external environment condition and light intensity information are sent in sound-optical controller, chip in sound-optical controller is owing to have input set point, when the brightness of the external environment that photodiode is propagated is lower than set point, chip in sound-optical controller just produces pulse current, makes the dual-colored LED lamp being connected on control section shinny by amplifying circuit; When the sound wave that acoustic control microphone is propagated is greater than the set point of sound-optical controller chips, the chip of control acousto-optic device can produce pulse current equally, so, sound light control circuit is just communicated with and works, achieve LED from luminous, glisten to the process extinguished all without the need to human users.
Be in another Chinese invention patent application of 201310469082.X at application number, disclose a kind of LED illumination sound light control circuit, comprise sound control circuit, light-operated circuit, MCU, LED constant-current control circuit; Described sound control circuit, comprises MIC, audio signal processing circuit; Described MIC is transferred to audio signal processing circuit process after obtaining voice signal, and then output sound detects high level point signal to the I/O port of MCU; Described light-operated circuit, comprises photodiode, optical signal processing circuit; Described photodiode is transferred to optical signal processing circuit process after obtaining light signal, and the signal of the reflection intensity of illumination then exported gathers port to the AD of MCU; Described LED constant-current control circuit is connected with MCU, adopts PWM light modulation constant current to drive the control signal of MCU to export control LED, realizes controlling the Intelligent acousto-optic of LED illumination.Its advantage is that structure is simple, volume is little, can realizes Based Intelligent Control and tunable optical.
Above-mentioned two parts of applications for a patent for invention, all adopt light-operated circuit and sound control circuit to be input in chip or microprocessor side by side, after chip or microprocessor processes, export control signal to delay control circuit, control the break-make of delay control circuit, thus control the break-make of rear rectifier, reach the object that control LED lights or extinguishes.Owing to being be input in chip or microprocessor side by side by light-operated circuit and sound control circuit, therefore there is following defect: (1) adds chip or microprocessor, need programming, both added cost, and also reduced reliability; (2) after microphone receives voice signal, just through process such as simple audio frequency amplifications, then the optically-controlled signal inputted with light-operated circuit in chip or microprocessor compares, so often cause larger error, there is more Wrong control, discrimination degree for sound is also poor, is difficult to really realize acoustic control, light-operated merging application.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of LED voice control light-controlled switching circuit, this LED voice control light-controlled switching circuit.The technical scheme adopted is as follows:
A kind of LED voice control light-controlled switching circuit, comprise sound control circuit, light-operated circuit, delay control circuit, rectifier BR and filter circuit of pressure-stabilizing, sound control circuit comprises microphone B, the output of light-operated circuit is connected with the input of delay control circuit, two power inputs of delay control circuit are connected with the positive pole of rectifier BR, negative pole respectively, positive pole, the negative pole of filter circuit of pressure-stabilizing and rectifier BR are connected, and it is characterized in that: described sound control circuit also comprises positive feedback formula audio frequency amplifier; Described light-operated circuit comprises photo resistance RG, resistance R5, resistance R6, resistance R7, transistor VT3 and transistor VT4; Photo resistance RG, resistance R5, resistance R6 are sequentially connected in series, and the other end of photo resistance RG is connected with the positive output end of filter circuit of pressure-stabilizing, and the other end of resistance R6 is connected with the negative output terminal of filter circuit of pressure-stabilizing; The base stage of transistor VT3 is connected between resistance R5 and resistance R6, and the collector electrode of transistor VT3 is connected with the positive output end of filter circuit of pressure-stabilizing by resistance R7, and the emitter of transistor VT3 is connected with the negative output terminal of filter circuit of pressure-stabilizing; The base stage of transistor VT4 is connected with the collector electrode of transistor VT3, and the collector electrode of transistor VT4 is connected with the positive output end of filter circuit of pressure-stabilizing, and the emitter of transistor VT4 is connected with the input of delay control circuit; One end of microphone B is connected with the input of positive feedback formula audio frequency amplifier, and the other end of microphone B is connected with the negative output terminal of filter circuit of pressure-stabilizing; Two power inputs of positive feedback formula audio frequency amplifier are connected with the positive output end of filter circuit of pressure-stabilizing, negative output terminal respectively; The output of positive feedback formula audio frequency amplifier is connected with the base stage of transistor VT3.
Usually, in side circuit application, one end of LED drive circuit RL is connected with one end of AC power, and the other end of LED drive circuit RL is connected with an input of rectifier BR, and another input of rectifier BR is connected with the other end of AC power.
AC power, LED drive circuit RL, rectifier BR form the drive circuit of LED group, and export direct current after filter circuit of pressure-stabilizing step-down current limliting, voltage stabilizing, filtering from the positive pole of rectifier BR, negative pole, the work electricity consumptions such as supply sound control circuit, transistor VT3 and transistor VT4.The resistance of photo resistance RG reduced and diminished, and make transistor VT3 conducting, and transistor VT4 ends under the condition of light intensity daytime.Now delay control circuit disconnects, and rectifier BR does not also export, and LED drive circuit RL turns off simultaneously.Under the condition that illumination is low or evening, the resistance of photo resistance RG uprises increase, now, the bias reinstating positive feedback formula audio frequency amplifier makes transistor VT1 conducting, the electric current of the emitter of transistor VT1 flows into the base stage of transistor VT3, makes transistor VT3 still be in conducting state, therefore, in peace and quiet or when not having sound status, rectifier BR and LED drive circuit RL is still in the state of quitting work.
Talk when there being people or pedestrian brings step sound time, after microphone B pickoff signals, be input to positive feedback formula audio frequency amplifier, positive feedback formula audio frequency amplifier outputs to the base stage of transistor VT3 again, the base stage of transistor VT3 has very strong audio signal input, audio signal negative half-cycle makes transistor VT3 exit conducting state, enters magnifying state or cut-off state.The current potential of the collector electrode of transistor VT3 rises, transistor VT4 conducting, direct voltage exports delay control circuit to through the emitter of transistor VT4, and delay control circuit is connected, at this moment rectifier BR connects, and LED drive circuit RL enters normal operating state.During LED work, brightness meeting grow, although the resistance step-down of photo resistance RG can be made, transistor VT3 conducting is blocked, but because delay control circuit has delay function, so LED can continue just to work, until the time delay of delay control circuit terminates, rectifier BR, LED drive circuit RL, LED turn off, and stop normally working; If again have the sound, LED can light normal work again.
The present invention is not as prior art, carry out amplification process simply to the process of voice signal, but by setting up positive feedback formula audio frequency amplifier, resolution process is carried out to the intensity of sound, increases substantially the discrimination degree of sound, increased substantially control accuracy, the present invention casts off prior art once and for all by sound control circuit, mentality of designing in light-operated circuit access chip arranged side by side or microprocessor, but the output of sound control circuit is linked in light-operated circuit, under high light, photo resistance RG in light-operated circuit and transistor block the audio signal inputted from sound control circuit, therefore, no matter sound large more also can not make rectifier BR, LED drive circuit RL connects, LED can not light, and in dark conditions, as long as have footsteps or Conversation Voice etc., rectifier BR connects, LED drive circuit RL enters normal operating state, LED lights, acoustic control, light-operated quite stable, really realize acoustic control, light-operated merging application.
As preferred version of the present invention, described positive feedback formula audio frequency amplifier comprises resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2, transistor VT1 and transistor VT2; Described microphone B and resistance R1 is connected in series, and resistance R1 is connected with the positive output end of filter circuit of pressure-stabilizing, and microphone B is connected with the negative output terminal of filter circuit of pressure-stabilizing; The base stage of transistor VT1 is connected between microphone B and resistance R1 by electric capacity C1, the collector electrode of transistor VT1 is connected with the positive output end of filter circuit of pressure-stabilizing by resistance R4, and the emitter of transistor VT1 is connected with the base stage of described transistor VT3; The base stage of transistor VT2 is connected with the negative output terminal of filter circuit of pressure-stabilizing respectively by resistance R3, is connected with the collector electrode of transistor VT1 by electric capacity C2, the collector electrode of transistor VT2 is connected with the base stage of transistor VT1 and passes through resistance R2 and is connected with the collector electrode of transistor VT1, and the emitter of transistor VT2 is connected with the negative output terminal of filter circuit of pressure-stabilizing.Illumination is in low or evening, the resistance of photosensitive RG uprises increase, the bias being used from resistance R2 makes transistor VT1 conducting, the electric current of the emitter of transistor VT1 flows into the base stage of transistor VT3, transistor VT3 is made still to be in conducting state, so in peace and quiet or when not having sound status, rectifier BR and LED drive circuit RL is still in the state of quitting work.Talk when there being people or pedestrian brings step sound time, after microphone B pickoff signals, deliver to transistor VT1 with regard to output respective audio signal through electric capacity C1 to amplify, audio signal after amplification is injected the base stage of transistor VT3 on the one hand by the emitter of transistor VT1, exported by the collector electrode of transistor VT1 on the other hand, the base stage of transistor VT2 is coupled to through electric capacity C2, this signal is after transistor VT2 amplifies, the base stage being again sent to transistor VT1 is exported by the collector electrode of transistor VT2, such transistor VT1, transistor VT2 forms positive feedback formula audio frequency amplifier, improve circuit gain, improve the sensitivity of sound control circuit.
As preferred version of the present invention, described filter circuit of pressure-stabilizing comprises diode VD1, resistance R8, diode VS and electric capacity C3; The anode of diode VD1 is connected with the positive pole of described rectifier BR, and the negative terminal of diode VD1 is connected with one end of resistance R8, and the other end of resistance R8 is as the positive output end of filter circuit of pressure-stabilizing; Between the negative pole being connected to described rectifier BR after diode VS and electric capacity C3 parallel connection and the other end of resistance R8.The electric current that rectifier BR exports carries out rectification through diode VD1, and resistance R8 carries out step-down current limliting, and diode VS carries out voltage stabilizing, and electric capacity C3 carries out filtering, then supplies the work electricity consumptions such as sound control circuit, transistor VT3 and transistor VT4.
As preferred version of the present invention, described delay control circuit comprises diode VD2, electric capacity C4, resistance R9, resistance R10, resistance R11, electric capacity C5, transistor VT5, transistor VT6 and controllable silicon VTH; The negative terminal of diode VD2 is connected with one end of resistance R9, and the anode of diode VD2 is connected with the emitter of described transistor VT4, and one end of electric capacity C4 is connected between diode VD2 and resistance R9, and the other end of electric capacity C4 is connected with the negative pole of rectifier BR; The base stage of transistor VT5 is connected with the other end of resistance R9, and the collector electrode of transistor VT5 is connected with the positive pole of described rectifier BR by resistance R10, and the emitter of transistor VT5 is connected with the negative pole of rectifier BR; The base stage of transistor VT6 is connected with the collector electrode of transistor VT5, and the collector electrode of transistor VT6 is connected with the positive pole of rectifier BR by resistance R11, and the emitter of transistor VT6 is connected with the negative pole of rectifier BR; One end of electric capacity C5 is connected with the base stage of transistor VT6, and the other end of electric capacity C5 is connected with the negative pole of rectifier BR; The negative terminal of controllable silicon VTH is connected with the collector electrode of transistor VT6 and is connected with the negative pole of rectifier BR, and the anode of controllable silicon VTH is connected with the positive pole of rectifier BR, and controllable silicon VTH is as the output of delay control circuit.When transistor VT4 ends, on electric capacity C4, no-voltage exists, transistor VT5 is ended, transistor VT6 conducting, the gate pole of such controllable silicon VTH and negative electrode are by transistor VT6 short circuit, turned off by controllable silicon VTH, rectifier BR does not also export, and LED drive circuit RL turns off simultaneously.When transistor VT4 conducting, direct voltage charges rapidly to electric capacity C4 through the emitter of transistor VT4, diode VD2, and makes transistor VT5 conducting through resistance R9, and transistor VT6 ends, and relieves the blockade to controllable silicon VTH gate pole.Controllable silicon VTH gate pole obtains forward trigger current by resistance R11, and controllable silicon VTH is open-minded, and at this moment rectifier BR, LED drive circuit RL will enter normal operating state.After LED work, brightness grow, the resistance step-down of photosensitive RG can be made, transistor VT3 conducting is blocked, but because electric capacity C4 is filled with electric charge, electric capacity C4 is discharged to the emitter of transistor VT5 by resistance R9, make transistor VT5 still can keep conducting state, so LED can continue just to work enable, time delay continues to electric capacity C4 discharge off, and transistor VT5 ends, transistor VT6 conducting, controllable silicon VTH turns off, and rectifier BR, LED drive circuit RL turn off simultaneously, and LED is extinguished.
Compared with prior art, tool has the following advantages in the present invention:
The present invention, by setting up positive feedback formula audio frequency amplifier, carries out resolution process to the intensity of sound, increases substantially the discrimination degree of sound, increased substantially control accuracy; The output of sound control circuit is linked in light-operated circuit, under high light, photo resistance RG in light-operated circuit and transistor block the audio signal inputted from sound control circuit, therefore, no matter sound large more also can not make rectifier BR, LED drive circuit RL connect, LED can not light, and in dark conditions, as long as have footsteps or Conversation Voice etc., rectifier BR connects, and LED drive circuit RL enters normal operating state, and LED lights, acoustic control, light-operated quite stable, really realize acoustic control, light-operated merging application.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Be described further below in conjunction with accompanying drawing and the preferred embodiment of the present invention.
As shown in Figure 1, this LED voice control light-controlled switching circuit, comprises sound control circuit 1, light-operated circuit 2, delay control circuit 3, rectifier BR and filter circuit of pressure-stabilizing 4; The output of light-operated circuit 2 is connected with the input of delay control circuit 3, and two power inputs of delay control circuit 3 are connected with the positive pole of rectifier BR, negative pole respectively, and positive pole, the negative pole of filter circuit of pressure-stabilizing 4 and rectifier BR are connected; Sound control circuit 1 comprises microphone B and positive feedback formula audio frequency amplifier 101; Light-operated circuit 2 comprises photo resistance RG, resistance R5, resistance R6, resistance R7, transistor VT3 and transistor VT4; Photo resistance RG, resistance R5, resistance R6 are sequentially connected in series, and the other end of photo resistance RG is connected with the positive output end of filter circuit of pressure-stabilizing 4, and the other end of resistance R6 is connected with the negative output terminal of filter circuit of pressure-stabilizing 4; The base stage of transistor VT3 is connected between resistance R5 and resistance R6, and the collector electrode of transistor VT3 is connected with the positive output end of filter circuit of pressure-stabilizing 4 by resistance R7, and the emitter of transistor VT3 is connected with the negative output terminal of filter circuit of pressure-stabilizing 4; The base stage of transistor VT4 is connected with the collector electrode of transistor VT3, and the collector electrode of transistor VT4 is connected with the positive output end of filter circuit of pressure-stabilizing 4, and the emitter of transistor VT4 is connected with the input of delay control circuit 3; One end of microphone B is connected with the input of positive feedback formula audio frequency amplifier 101, and the other end of microphone B is connected with the negative output terminal of filter circuit of pressure-stabilizing 4; Two power inputs of positive feedback formula audio frequency amplifier 101 are connected with the positive output end of filter circuit of pressure-stabilizing 4, negative output terminal respectively; The output of positive feedback formula audio frequency amplifier 101 is connected with the base stage of transistor VT3.
Positive feedback formula audio frequency amplifier 101 comprises resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2, transistor VT1 and transistor VT2; Microphone B and resistance R1 is connected in series, and resistance R1 is connected with the positive output end of filter circuit of pressure-stabilizing 4, and microphone B is connected with the negative output terminal of filter circuit of pressure-stabilizing 4; The base stage of transistor VT1 is connected between microphone B and resistance R1 by electric capacity C1, the collector electrode of transistor VT1 is connected with the positive output end of filter circuit of pressure-stabilizing 4 by resistance R4, and the emitter of transistor VT1 is connected with the base stage of transistor VT3; The base stage of transistor VT2 is connected with the negative output terminal of filter circuit of pressure-stabilizing 4 respectively by resistance R3, is connected with the collector electrode of transistor VT1 by electric capacity C2, the collector electrode of transistor VT2 is connected with the base stage of transistor VT1 and passes through resistance R2 and is connected with the collector electrode of transistor VT1, and the emitter of transistor VT2 is connected with the negative output terminal of filter circuit of pressure-stabilizing 4.
Filter circuit of pressure-stabilizing 4 comprises diode VD1, resistance R8, diode VS and electric capacity C3; The anode of diode VD1 is connected with the positive pole of rectifier BR, and the negative terminal of diode VD1 is connected with one end of resistance R8, and the other end of resistance R8 is as the positive output end of filter circuit of pressure-stabilizing 4; Be connected between the negative pole of rectifier BR and the other end of resistance R8 after diode VS and electric capacity C3 parallel connection.
Delay control circuit 3 comprises diode VD2, electric capacity C4, resistance R9, resistance R10, resistance R11, electric capacity C5, transistor VT5, transistor VT6 and controllable silicon VTH; The negative terminal of diode VD2 is connected with one end of resistance R9, and the anode of diode VD2 is connected with the emitter of described transistor VT4, and one end of electric capacity C4 is connected between diode VD2 and resistance R9, and the other end of electric capacity C4 is connected with the negative pole of rectifier BR; The base stage of transistor VT5 is connected with the other end of resistance R9, and the collector electrode of transistor VT5 is connected with the positive pole of rectifier BR by resistance R10, and the emitter of transistor VT5 is connected with the negative pole of rectifier BR; The base stage of transistor VT6 is connected with the collector electrode of transistor VT5, and the collector electrode of transistor VT6 is connected with the positive pole of rectifier BR by resistance R11, and the emitter of transistor VT6 is connected with the negative pole of rectifier BR; One end of electric capacity C5 is connected with the base stage of transistor VT6, and the other end of electric capacity C5 is connected with the negative pole of rectifier BR; The negative terminal of controllable silicon VTH is connected with the collector electrode of transistor VT6 and is connected with the negative pole of rectifier BR, and the anode of controllable silicon VTH is connected with the positive pole of rectifier BR, and controllable silicon VTH is as the output of delay control circuit.
AC power AC, LED drive circuit RL, rectifier BR form the drive circuit of LED group, and export direct current and carry out rectification from the positive pole of rectifier BR, negative pole through diode VD1, resistance R8 carries out step-down current limliting, diode VS carries out voltage stabilizing, electric capacity C3 carries out filtering, then supplies the work electricity consumptions such as sound control circuit 1, transistor VT3 and transistor VT4.
The resistance of photo resistance RG reduced and diminished, and make transistor VT3 conducting, and transistor VT4 ends under the condition of light intensity daytime.Now delay control circuit 3 disconnects, and rectifier BR does not also export, and LED drive circuit RL turns off simultaneously.Under the condition that illumination is low or evening, the resistance of photo resistance RG uprises increase, now, the bias reinstating the resistance R2 in positive feedback formula audio frequency amplifier 101 makes transistor VT1 conducting, the electric current of the emitter of transistor VT1 flows into the base stage of transistor VT3, makes transistor VT3 still be in conducting state, therefore, in peace and quiet or when not having sound status, rectifier BR and LED drive circuit RL is still in the state of quitting work.
Talk when there being people or pedestrian brings step sound time, after microphone B pickoff signals, deliver to transistor VT1 with regard to output respective audio signal through electric capacity C1 to amplify, audio signal after amplification is injected the base stage of transistor VT3 on the one hand by the emitter of transistor VT1, exported by the collector electrode of transistor VT1 on the other hand, the base stage of transistor VT2 is coupled to through electric capacity C2, this signal is after transistor VT2 amplifies, the base stage being again sent to transistor VT1 is exported by the collector electrode of transistor VT2, such transistor VT1, transistor VT2 forms positive feedback formula audio frequency amplifier 101, improve circuit gain, improve the sensitivity of sound control circuit 1, the emitter of transistor VT1 outputs to the base stage of transistor VT3 again, the base stage of transistor VT3 has very strong audio signal input, audio signal negative half-cycle makes transistor VT3 exit conducting state, enter magnifying state or cut-off state.The current potential of the collector electrode of transistor VT3 rises, transistor VT4 conducting, direct voltage charges rapidly to electric capacity C4 through the emitter of transistor VT4, diode VD2, and make transistor VT5 conducting through resistance R9, transistor VT6 ends, and relieves the blockade to controllable silicon VTH gate pole.Controllable silicon VTH gate pole obtains forward trigger current by resistance R11, and controllable silicon VTH is open-minded, and at this moment rectifier BR, LED drive circuit RL will enter normal operating state.After LED work, brightness grow, the resistance step-down of photosensitive RG can be made, transistor VT3 conducting is blocked, but because electric capacity C4 is filled with electric charge, electric capacity C4 is discharged to the emitter of transistor VT5 by resistance R9, make transistor VT5 still can keep conducting state, so LED can continue just to work enable, time delay continues to electric capacity C4 discharge off, and transistor VT5 ends, transistor VT6 conducting, controllable silicon VTH turns off, and rectifier BR, LED drive circuit RL turn off simultaneously, and LED is extinguished.
The present invention is not as prior art, carry out amplification process simply to the process of voice signal, but by setting up positive feedback formula audio frequency amplifier 101, resolution process is carried out to the intensity of sound, increases substantially the discrimination degree of sound, increased substantially control accuracy, the present invention casts off prior art once and for all by sound control circuit 1, the mentality of designing of light-operated circuit 2 side by side in access chip or microprocessor, but the output of sound control circuit 1 is linked in light-operated circuit 2, under high light, photo resistance RG in light-operated circuit 2 and transistor block the audio signal inputted from sound control circuit 1, therefore, no matter sound large more also can not make rectifier BR, LED drive circuit RL connects, LED can not light, and in dark conditions, as long as have footsteps or Conversation Voice etc., rectifier BR connects, LED drive circuit RL enters normal operating state, LED lights, acoustic control, light-operated quite stable, really realize acoustic control, light-operated merging application, transistor VT1, transistor VT2 form positive feedback formula audio frequency amplifier 101 in addition, improve circuit gain, improve the sensitivity of sound control circuit 1.
In addition; it should be noted that, the specific embodiment described in this specification, its each several part title etc. can be different; all equivalences of doing according to structure, feature and the principle described in inventional idea of the present invention or simple change, be included in the protection range of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (4)
1. a LED voice control light-controlled switching circuit, comprise sound control circuit, light-operated circuit, delay control circuit, rectifier BR and filter circuit of pressure-stabilizing, sound control circuit comprises microphone B, the output of light-operated circuit is connected with the input of delay control circuit, two power inputs of delay control circuit are connected with the positive pole of rectifier BR, negative pole respectively, positive pole, the negative pole of filter circuit of pressure-stabilizing and rectifier BR are connected, and it is characterized in that: described sound control circuit also comprises positive feedback formula audio frequency amplifier; Described light-operated circuit comprises photo resistance RG, resistance R5, resistance R6, resistance R7, transistor VT3 and transistor VT4; Photo resistance RG, resistance R5, resistance R6 are sequentially connected in series, and the other end of photo resistance RG is connected with the positive output end of filter circuit of pressure-stabilizing, and the other end of resistance R6 is connected with the negative output terminal of filter circuit of pressure-stabilizing; The base stage of transistor VT3 is connected between resistance R5 and resistance R6, and the collector electrode of transistor VT3 is connected with the positive output end of filter circuit of pressure-stabilizing by resistance R7, and the emitter of transistor VT3 is connected with the negative output terminal of filter circuit of pressure-stabilizing; The base stage of transistor VT4 is connected with the collector electrode of transistor VT3, and the collector electrode of transistor VT4 is connected with the positive output end of filter circuit of pressure-stabilizing, and the emitter of transistor VT4 is connected with the input of delay control circuit; One end of microphone B is connected with the input of positive feedback formula audio frequency amplifier, and the other end of microphone B is connected with the negative output terminal of filter circuit of pressure-stabilizing; Two power inputs of positive feedback formula audio frequency amplifier are connected with the positive output end of filter circuit of pressure-stabilizing, negative output terminal respectively; The output of positive feedback formula audio frequency amplifier is connected with the base stage of transistor VT3.
2. LED voice control light-controlled switching circuit as claimed in claim 1, is characterized in that: described positive feedback formula audio frequency amplifier comprises resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2, transistor VT1 and transistor VT2; Described microphone B and resistance R1 is connected in series, and resistance R1 is connected with the positive output end of filter circuit of pressure-stabilizing, and microphone B is connected with the negative output terminal of filter circuit of pressure-stabilizing; The base stage of transistor VT1 is connected between microphone B and resistance R1 by electric capacity C1, the collector electrode of transistor VT1 is connected with the positive output end of filter circuit of pressure-stabilizing by resistance R4, and the emitter of transistor VT1 is connected with the base stage of described transistor VT3; The base stage of transistor VT2 is connected with the negative output terminal of filter circuit of pressure-stabilizing respectively by resistance R3, is connected with the collector electrode of transistor VT1 by electric capacity C2, the collector electrode of transistor VT2 is connected with the base stage of transistor VT1 and passes through resistance R2 and is connected with the collector electrode of transistor VT1, and the emitter of transistor VT2 is connected with the negative output terminal of filter circuit of pressure-stabilizing.
3. LED voice control light-controlled switching circuit as claimed in claim 1, is characterized in that: described filter circuit of pressure-stabilizing comprises diode VD1, resistance R8, diode VS and electric capacity C3; The anode of diode VD1 is connected with the positive pole of described rectifier BR, and the negative terminal of diode VD1 is connected with one end of resistance R8, and the other end of resistance R8 is as the positive output end of filter circuit of pressure-stabilizing; Between the negative pole being connected to described rectifier BR after diode VS and electric capacity C3 parallel connection and the other end of resistance R8.
4. LED voice control light-controlled switching circuit as claimed in claim 1, is characterized in that: described delay control circuit comprises diode VD2, electric capacity C4, resistance R9, resistance R10, resistance R11, electric capacity C5, transistor VT5, transistor VT6 and controllable silicon VTH; The negative terminal of diode VD2 is connected with one end of resistance R9, and the anode of diode VD2 is connected with the emitter of described transistor VT4, and one end of electric capacity C4 is connected between diode VD2 and resistance R9, and the other end of electric capacity C4 is connected with the negative pole of rectifier BR; The base stage of transistor VT5 is connected with the other end of resistance R9, and the collector electrode of transistor VT5 is connected with the positive pole of described rectifier BR by resistance R10, and the emitter of transistor VT5 is connected with the negative pole of rectifier BR; The base stage of transistor VT6 is connected with the collector electrode of transistor VT5, and the collector electrode of transistor VT6 is connected with the positive pole of rectifier BR by resistance R11, and the emitter of transistor VT6 is connected with the negative pole of rectifier BR; One end of electric capacity C5 is connected with the base stage of transistor VT6, and the other end of electric capacity C5 is connected with the negative pole of rectifier BR; The negative terminal of controllable silicon VTH is connected with the collector electrode of transistor VT6 and is connected with the negative pole of rectifier BR, and the anode of controllable silicon VTH is connected with the positive pole of rectifier BR, and controllable silicon VTH is as the output of delay control circuit.
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