CN209545969U - A kind of light-operated switch control circuit - Google Patents
A kind of light-operated switch control circuit Download PDFInfo
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- CN209545969U CN209545969U CN201822276075.9U CN201822276075U CN209545969U CN 209545969 U CN209545969 U CN 209545969U CN 201822276075 U CN201822276075 U CN 201822276075U CN 209545969 U CN209545969 U CN 209545969U
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Abstract
The utility model provides a kind of light-operated switch control circuit, including light-sensitive element PT1, resistance R1, the first transistor Q1, capacitor C1 and lighting control module, the one end the resistance R1 connects DC power supply VCC, one end of other end connection light-sensitive element PT1, the other end of the light-sensitive element PT1 is grounded, it is grounded after the contact of the base stage connection resistance R1 and light-sensitive element PT1 of the first transistor Q1 through capacitor C1, emitter is directly grounded, collector connects lighting control module, the lighting control module connects DC power supply VCC, it is characterized by also including resistance R2, resistance R3 and second transistor Q2, the second transistor Q2 emitter is through resistance R2 connection DC power supply VCC, the base stage of collector connection the first transistor Q1, base stage is through resistance R3 Connect the collector of the first transistor Q1.During lighting device starts herein, the remaining light (the non-strong light of direct projection) issued in spite of itself is irradiated on light-sensitive element PT1, and the phenomenon that light flashes repeatedly will not occur in lighting device.
Description
Technical field
The utility model relates to controlling light illuminating apparatus field, in particular to a kind of light-operated switch control circuit.
Background technique
Relevant parameter (the electricity flowed through when the intensity of illumination being irradiated on light-sensitive element changes, on light-sensitive element
Stream, resistance value etc.) it can follow and change, it detects this variation of light-sensitive element and for controlling other systems, is exactly light-operated.
Currently used light-operated switch control circuit is as shown in Figure 1, when light-sensitive element PT1 detects subtracting for intensity of illumination
Small, resistance value increases, and under certain intensity of illumination, the coil of transistor Q1 conducting, relay RY1 is powered, and contact switch is inhaled
It closes, the light of lighting device lights (intensity of illumination at this time is known as starting intensity of illumination threshold value).By the route of Fig. 1 it is found that opening
Dynamic intensity of illumination threshold value is only determined by resistance R1.
When light-sensitive element PT1 detects the increase of intensity of illumination, resistance value reduces, under certain intensity of illumination, crystal
Pipe Q1 cut-off, the coil no power of relay RY1, contact switch disconnect, the lights (intensity of illumination at this time of lighting device
Referred to as close intensity of illumination threshold value).It is only determined by resistance R1 by the route of Fig. 1 it is found that closing intensity of illumination threshold value.
By upper analysis it is found that as shown in Fig. 2, the starting intensity of illumination threshold value (A of currently used light-operated switch control circuit
Point) it is equal with intensity of illumination threshold value (B point) is closed.
Due to starting intensity of illumination threshold value (A point) and closing intensity of illumination threshold value (B point) equal, transistor in light-operated circuit
Q1 works in critical state.When light-sensitive element PT1 perception exterior light is according to starting intensity of illumination threshold value is reached, relay RY1
Contact switch be attracted, the light of lighting device lights.After lighting device lights light, some light can be irradiated or is reflected into
On light-sensitive element PT1, light-sensitive element PT1 will cause relay RY1 disconnection, the lamp of lighting device again after receiving these light
Light extinguishes.Later, because exterior light according to again meet starting intensity of illumination threshold condition, lamp can restart again it is light, in this way week
And the starting and closing renewed, it will cause the continuous light on and off of lighting device, light flashes repeatedly.
To prevent the problem of above-mentioned light flashes repeatedly, when installing lighting device, light-sensitive element PT1 will be kept away completely
The position installation for opening the light of lighting device sending, is otherwise easy to that there is a phenomenon where above-mentioned light to flash repeatedly, in this way to photograph
The design of bright device installation site, mounting means or even lamps and lanterns all brings certain limitation.
Light-operated switch product currently on the market, although above-mentioned lighting device light can be solved with MCU controller repeatedly
The problem of flashing.But using MCU controller there are costs relatively high, complex circuit, the component used is more the disadvantages of.
Utility model content
It is avoided that lighting device light flashes light-operated repeatedly the technical problem to be solved by the present invention is to provide a kind of
ON-OFF control circuit.
In order to solve the above technical problems, the utility model provides a kind of light-operated switch control circuit, including light-sensitive element
PT1, resistance R1, the first transistor Q1, capacitor C1 and lighting control module, the one end the resistance R1 connect DC power supply VCC, separately
One end connects one end of light-sensitive element PT1, the other end ground connection of the light-sensitive element PT1, the base stage of the first transistor Q1
It is grounded after connecting the contact of resistance R1 and light-sensitive element PT1 through capacitor C1, emitter is directly grounded, and collector connects signal light control
Module, the lighting control module connect DC power supply VCC, it is characterised in that: further include resistance R2, resistance R3 and the second crystal
Pipe Q2, the second transistor Q2 emitter connect the base of the first transistor Q1 through resistance R2 connection DC power supply VCC, collector
Pole, collector of the base stage through resistance R3 connection the first transistor Q1.
Preferably, the lighting control module includes relay RY1, and coil one end of the relay RY1 connects direct current
Power supply VCC, the other end connect the collector of the first transistor Q1, and the contact switch of the relay RY1 is serially connected in lighting device
Major loop on.
Preferably, the lighting control module includes diode D1, and the diode D1 cathode connects DC power supply VCC,
The collector of anode connection the first transistor Q1, D1 cathode are connected to the base stage that R3 is connected to Q2.
Preferably, the contact switch of the relay RY1 is normally opened.
Preferably, the lighting control module includes third transistor Q3, and the third transistor Q3 collector connection is shone
The supply pin of the chip of bright device or enabled foot, emitter ground connection, collector of the base stage through resistance R5 connection the first transistor Q1,
The collector of the first transistor Q1 is through resistance R4 connection DC power supply VCC.
The utility model has the following beneficial effects: light-sensitive element PT1 detects that the illumination of surrounding is strong when dimming
Degree weakens, then the internal resistance of light-sensitive element PT1 increases, and increases so as to cause the base voltage of the first transistor Q1, works as intensity of illumination
Weaken to when starting intensity of illumination threshold value, the base stage of the first transistor Q1 becomes high level, then the first transistor Q1 is connected, at this time
Lighting control module control lighting device lights light.While above-mentioned transistor Q1 conducting, Q1 collector becomes low level,
Then the base stage of second transistor Q2 also becomes low level, therefore transistor Q2 can also be connected.After transistor Q2 conducting, direct current
The output voltage of source VCC is added in the base stage of the first transistor Q1 through resistance R2, second transistor Q2, so that the first transistor Q1
Rapidly enter saturation conduction.If the first transistor Q1 will be exited if saturation conduction becomes off state at this time, light-sensitive element
PT1 will detect that the intensity of illumination much larger than starting intensity of illumination threshold value is just able to achieve, so the mistake that lighting device starts herein
Cheng Zhong, the remaining light (the non-strong light of direct projection) issued in spite of itself are irradiated on light-sensitive element PT1, and lamp will not occur in lighting device
The phenomenon that light flashes repeatedly.
Detailed description of the invention
Fig. 1 is the circuit diagram of common light-operated switch control circuit；
Fig. 2 is the starting intensity of illumination threshold value of common light-operated switch control circuit and the relationship for closing intensity of illumination threshold value
Figure；
Fig. 3 is the circuit diagram of the light-operated switch control circuit of embodiment one；
Fig. 4 is the circuit diagram of the light-operated switch control circuit of embodiment two.
Fig. 5 is the starting intensity of illumination threshold value and closing intensity of illumination threshold of the light-operated switch control circuit of embodiment one, two
The relational graph of value.
Specific embodiment
Embodiment one
As shown in figure 3, the light-operated switch control circuit of the present embodiment includes light-sensitive element PT1, the first transistor Q1, second
Transistor Q2, resistance R1, resistance R2, resistance R3, diode D1, capacitor C1 and relay RY1, wherein the first transistor Q1 is
NPN transistor, second transistor Q2 are PNP transistors.
The one end resistance R1, the one end resistance R2, diode D1 cathode and relay RY1 coil one end be commonly connected to direct current
On power supply VCC；The resistance R1 other end connects one end of light-sensitive element PT1, and the other end of light-sensitive element PT1 connects reference ground
GND；The resistance R2 other end connects the emitter of second transistor Q2, and the base stage of second transistor Q2 connects one end of resistance R3,
The other end of resistance R3, the anode of diode D1, the coil other end of relay RY1 and the first transistor Q1 collector this four
Person connects；The base stage of the collector of contact, second transistor Q2 between resistance R1 and light-sensitive element PT1, the first transistor Q1
This three connect after through capacitor C1 connection reference ground GND, the emitter of the first transistor Q1 is directly connected to reference ground GND；
The contact switch of relay RY1 is serially connected on the major loop of lighting device.
The working principle of light-operated switch control circuit is as follows:
1., since illumination is stronger, the internal resistance very little of light-sensitive element PT1, then the base stage of the first transistor Q1 is low on daytime
Level, the first transistor Q1 cut-off.After the first transistor Q1 cut-off, current collection extremely high level, then the base of second transistor Q2
Pole is also high level, and second transistor Q2 is also switched off.The coil no power of relay RY1 at this time, the contact switch of relay RY1
It disconnects, then lighting device cannot light light.
2. dimming, light-sensitive element PT1 detects that the intensity of illumination of surrounding weakens, then light-sensitive element when the evening draws on
The internal resistance of PT1 increases, and increases so as to cause the base voltage of the first transistor Q1.When intensity of illumination weakens to starting intensity of illumination
When threshold value, the base stage of the first transistor Q1 becomes high level, then the first transistor Q1 is connected, and the coil of relay RY1 is logical at this time
The contact switch of electricity, relay RY1 is attracted, then lighting device lights light.While above-mentioned transistor Q1 conducting, Q1 current collection
Pole becomes low level, then the base stage of second transistor Q2 also becomes low level, therefore transistor Q2 can also be connected.As transistor Q2
After conducting, the output voltage of DC power supply VCC is added in the base stage of the first transistor Q1 through resistance R2, second transistor Q2, is made
It obtains the first transistor Q1 and rapidly enters saturation conduction.If the first transistor Q1, which will exit saturation conduction, at this time becomes off state
Words, then light-sensitive element PT1 will detect that the intensity of illumination for being greater than starting intensity of illumination threshold value is just able to achieve, so lighting device exists
During this starting, the remaining light (the non-strong light of direct projection) issued in spite of itself is irradiated on light-sensitive element PT1, lighting device
It is not in the phenomenon that light flashes repeatedly.
3. light gradually brightens when dawn, light-sensitive element PT1 detects the intensity of illumination enhancing of surrounding, then photosensitive
The internal resistance of element PT1 reduces, and reduces so as to cause the base voltage of the first transistor Q1.When intensity of illumination is enhanced to closing illumination
When intensity threshold, the first transistor Q1, which exits saturation conduction, becomes off state.After the first transistor Q1 cut-off, first crystal
The collector of pipe Q1 becomes high level, then the base stage of second transistor Q2 also becomes high level, therefore second transistor Q2 also can
Cut-off.The contact switch of the coil no power of relay RY1 at this time, relay RY1 disconnects, then the lights of lighting device.
Diode D1 is used as freewheeling diode at this time, and in coil blackout, forming circuit is to protect the component in circuit not broken
It is bad.
By upper analysis it is found that as shown in figure 5, the closing intensity of illumination threshold value (B point) of light-operated switch control circuit > starting light
According to intensity threshold (A point).That is light-sensitive element PT1 detect starting intensity of illumination threshold value and close intensity of illumination threshold value it
Between pull open gap, i.e., increase buffer area.In this way, lighting device is during starting, even if itself there is (the non-direct projection of sending remaining light
Qiang Guang) be irradiated on light-sensitive element PT1, light-operated switch control circuit will not due to being influenced light-sensitive element PT1 by the remaining light mistake
There is the problem of " light flash " in movement, to guarantee lighting device light perfection starting and close, and the light of the present embodiment
It is simple, low in cost to control ON-OFF control circuit.
Embodiment two
As shown in figure 4, the light-operated switch control circuit of the present embodiment includes light-sensitive element PT1, the first transistor Q1, second
Transistor Q2, third transistor Q3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and capacitor C1, wherein first is brilliant
Body pipe Q1 and third transistor Q3 is NPN transistor, and second transistor Q2 is PNP transistor.
The one end resistance R1, the one end resistance R2 and the one end resistance R4 are commonly connected on DC power supply VCC；The resistance R1 other end
One end of light-sensitive element PT1 is connected, the other end of light-sensitive element PT1 connects reference ground GND；Resistance R2 other end connection the
The emitter of two-transistor Q2, one end of the base stage connection resistance R3 of second transistor Q2, the other end of resistance R3, resistance R4
The collector of the other end, one end of resistance R5 and the first transistor Q1 this connect；Between resistance R1 and light-sensitive element PT1
Contact, the collector of second transistor Q2, the base stage of the first transistor Q1 this three connect after through capacitor C1 connection reference ground
GND, the emitter of the first transistor Q1 are directly connected to reference ground GND；The other end connection third transistor Q3's of resistance R5
Base stage, third transistor Q3 emitter are directly connected to reference ground GND, collector connect the chip of lighting device supply pin or
Enabled foot.
The working principle of the light-operated switch control circuit of the present embodiment is as follows:
1., since illumination is stronger, the internal resistance very little of photo resistance PT1, then the base stage of the first transistor Q1 is low on daytime
Level, the first transistor Q1 cut-off.After the first transistor Q1 cut-off, current collection extremely high level, then the base of second transistor Q2
Pole is also high level, and second transistor Q2 is also switched off；The base stage of third transistor Q3 is high level, and third transistor Q3 is connected,
After third transistor Q3 conducting, current collection extremely low level, the i.e. supply pin of connection chip or enabled foot are low level, so
Lighting device cannot light light.
2. dimming, photo resistance PT1 detects that the intensity of illumination of surrounding weakens, then light-sensitive element when the evening draws on
The internal resistance of PT1 increases, and increases so as to cause the base voltage of the first transistor Q1.When intensity of illumination is attenuated to starting intensity of illumination
When threshold value, the base stage of the first transistor Q1 becomes high level, then the first transistor Q1 is connected, at this time the current collection of the first transistor Q1
Pole becomes low level, therefore the base stage of second transistor Q2 becomes low level, then second transistor Q2 is connected；Third transistor Q3
Base stage also become low level, then third transistor Q3 end, third transistor Q3 cut-off after its collector become high level, i.e.,
The normal high supply pin or enabled foot for connecting chip are high level, so the light of lighting device is lighted.In the mistake that light is lighted
Cheng Zhong, after second transistor Q2 conducting, the output voltage of power supply VCC can be added to the first crystalline substance through resistance R2, second transistor Q2
In the base stage of body pipe Q1, so that the first transistor Q1 rapidly enters saturation conduction.If the first transistor Q1 will exit saturation at this time
If conducting becomes off state, then light-sensitive element PT1 will detect the intensity of illumination ability for being greater than starting intensity of illumination threshold value
It realizes, so being irradiated in spite of the remaining light (the non-strong light of direct projection) itself issued photosensitive during lighting device starts herein
On element PT1, the phenomenon that light flashes repeatedly will not occur in lighting device.
That is the supply pin or enabled foot for connecting chip are low level, so the lighting device light controlled " it puts out
Go out ".
When dawn, light gradually brightens, and light-sensitive element PT1 detects the intensity of illumination enhancing of surrounding, then photosensitive member
The internal resistance of part PT1 reduces, and reduces so as to cause the base voltage of the first transistor Q1.When intensity of illumination be enhanced to close illumination it is strong
When spending threshold value, the first transistor Q1, which exits saturation conduction, becomes off state.After the first transistor Q1 cut-off, the first transistor
The collector of Q1 becomes high level, then the base stage of second transistor Q2 also becomes high level, therefore second transistor Q2 can also be cut
Only.The base stage of third transistor Q3 is also high level at this time, then third transistor Q3 is connected, it collects after third transistor Q3 conducting
Electrode is low level, i.e., the supply pin of connection chip or enabled foot are low level, so the lights of lighting device.
By upper analysis it is found that the present embodiment is the same as example 1 (same to Fig. 5), the closing illumination of light-operated switch control circuit
Intensity threshold (B point) > starting intensity of illumination threshold value (A point).That is photo resistance PT1 detects starting intensity of illumination threshold value
Gap is pulled open with closing between intensity of illumination threshold value, i.e. increase buffer area.In this way, lighting device is during starting, even if
Itself there is sending remaining light (the non-strong light of direct projection) to be irradiated on light-sensitive element PT1, light-operated switch control circuit will not be because remaining by this
Shadow ring light-sensitive element PT1 and the problem of malfunction appearances " light flash ", thus guarantee lighting device light perfection starting with
It closes, and the light-operated switch control circuit of the present embodiment is simple, low in cost.
Claims (5)
1. a kind of light-operated switch control circuit, including light-sensitive element PT1, resistance R1, the first transistor Q1, capacitor C1 and light control
Molding block, the one end the resistance R1 connect DC power supply VCC, and the other end connects one end of light-sensitive element PT1, the light-sensitive element
The other end of PT1 is grounded, through capacitor C1 after the contact of the base stage connection resistance R1 and light-sensitive element PT1 of the first transistor Q1
Ground connection, emitter are directly grounded, and collector connects lighting control module, and the lighting control module connects DC power supply VCC,
It is characterized in that: further including resistance R2, resistance R3 and second transistor Q2, the second transistor Q2 emitter is connected through resistance R2
DC power supply VCC, collector connect the base stage of the first transistor Q1, current collection of the base stage through resistance R3 connection the first transistor Q1
Pole.
2. light-operated switch control circuit according to claim 1, it is characterised in that: the lighting control module includes relay
Coil one end of device RY1, the relay RY1 connect DC power supply VCC, and the other end connects the collector of the first transistor Q1,
The contact switch of the relay RY1 is serially connected on the major loop of lighting device.
3. light-operated switch control circuit according to claim 2, it is characterised in that: the lighting control module includes two poles
Pipe D1, the diode D1 cathode connect DC power supply VCC, the collector of anode connection the first transistor Q1, the connection of D1 cathode
The base stage of Q2 is connected to R3.
4. light-operated switch control circuit according to claim 2, it is characterised in that: the contact switch of the relay RY1
It is normally opened.
5. light-operated switch control circuit according to claim 1, it is characterised in that: the lighting control module includes third
Transistor Q3, the supply pin or enabled foot of the chip of the third transistor Q3 collector connection lighting device, emitter ground connection,
Collector of the base stage through resistance R5 connection the first transistor Q1, the collector of the first transistor Q1 is through resistance R4 connection direct current
Power supply VCC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822276075.9U CN209545969U (en) | 2018-12-29 | 2018-12-29 | A kind of light-operated switch control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822276075.9U CN209545969U (en) | 2018-12-29 | 2018-12-29 | A kind of light-operated switch control circuit |
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| CN209545969U true CN209545969U (en) | 2019-10-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114220325A (en) * | 2021-12-20 | 2022-03-22 | 长沙铭兴教学仪器有限公司 | Automobile flash circuit for teaching |
-
2018
- 2018-12-29 CN CN201822276075.9U patent/CN209545969U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114220325A (en) * | 2021-12-20 | 2022-03-22 | 长沙铭兴教学仪器有限公司 | Automobile flash circuit for teaching |
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