CN107277971B - Light-operated switch circuit of LED lamp - Google Patents
Light-operated switch circuit of LED lamp Download PDFInfo
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- CN107277971B CN107277971B CN201710457916.3A CN201710457916A CN107277971B CN 107277971 B CN107277971 B CN 107277971B CN 201710457916 A CN201710457916 A CN 201710457916A CN 107277971 B CN107277971 B CN 107277971B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a light-operated switch circuit of an LED lamp, which comprises a power supply circuit, a light-operated main circuit, a light-operated loop and a light-operated output circuit, wherein the input end of the power supply circuit is connected with a power supply voltage, the output end of the power supply circuit provides working voltages for the light-operated main circuit and the light-operated loop, the light-operated main circuit is connected with the light-operated loop, the output end of the light-operated main circuit is connected with the input end of the light-operated output circuit, and the output end of the light-operated output circuit is connected with a driving main circuit in a driving circuit of the LED lamp; the light control circuit has the advantages that the light control circuit feeds back signals of the light control main circuit, so that when the illumination intensity of external light is larger than or equal to the set first illumination intensity threshold value and smaller than or equal to the set second illumination intensity threshold value, the LED light source of the LED lamp cannot be extinguished, stray light of the external light or abrupt change of the external light is prevented from extinguishing the LED light source of the LED lamp, multiple on-off phenomena are avoided, and accordingly the service lives of the electronic device and the LED light source are prolonged.
Description
Technical Field
The invention relates to an illumination switch of an LED lamp, in particular to a light-operated switch circuit of the LED lamp.
Background
With the rapid development of lighting technology, lighting switches have undergone a development history from pull-switch to push-button switches to intelligent control switches. At present, the intelligent control switch technology mainly comprises light control, sound control, infrared induction, microwave induction, wireless remote control and the like.
Existing photoswitch technologies are controlled by using photoresistors and thyristors, such as: the invention patent 'light-operated switch circuit' of Chinese bulletin (patent number: ZL 201010244383.9), it discloses a light-operated switch circuit, it is formed by photoresistor, silicon controlled rectifier drive circuit, first silicon controlled rectifier and filter circuit, photoresistor links to each other with silicon controlled rectifier drive circuit, accept the light intensity, control the silicon controlled rectifier drive circuit according to the illumination condition whether to output the drive signal; the signal output end of the silicon controlled drive circuit is connected with the control electrode of the first silicon controlled; one end of the first controllable silicon is connected with a live wire of an alternating current power supply, the other end of the first controllable silicon is connected with one power input end of a controlled electric appliance through a filter circuit, and the other power input end of the controlled electric appliance is connected with a zero line of the alternating current power supply. The light intensity is received by the photoresistor, the resistance value is changed along with the change of illumination through the photoresistor, and the switch of the first controllable silicon is controlled by generating voltage change through the change of the resistance value, so that the switch of the controlled electric appliance is controlled; when the black light is generated, the resistance value of the photoresistor is infinite, the silicon controlled drive circuit works, and the output signal triggers the first silicon controlled rectifier to conduct, so that the controlled electric appliance works.
Existing photoswitch techniques also use photoresistors, transistors and relays, such as: the invention patent application 'discrete part dim light control switch' (application number: 201410802567.0) published in China discloses a discrete part dim light control switch, which comprises a 12V direct current power supply, a photosensitive circuit, an optical signal amplifying circuit, an optical signal power amplifying circuit and a direct current relay control and protection circuit, and is characterized in that: the photosensitive circuit consists of a photosensitive resistor RG, a potentiometer RP and a resistor R1, one end of the photosensitive resistor RG, one end of a linear potentiometer RP and one end of the resistor R1 are connected with the base electrode of an NPN transistor VT1, the other end of the linear potentiometer RP and the movable end thereof are connected with a circuit positive pole VCC, and the other end of the photosensitive resistor RG and the other end of the resistor R1 are connected with a circuit ground GND; the optical signal amplifying circuit consists of an NPN transistor VT1 and a resistor R2, wherein the collector electrode of the NPN transistor VT1 is connected with the positive electrode VCC of the circuit, the emitter electrode of the NPN transistor VT1 is connected with one end of the resistor R2, and the other end of the resistor R2 is connected with the circuit ground GND; the optical signal power amplifying circuit consists of an NPN transistor VT2 and a resistor R3, wherein the base electrode of the NPN transistor VT2 is connected with the emitter electrode of the NPN transistor VT1 through the resistor R3, the emitter electrode of the NPN transistor VT2 is connected with the circuit ground GND, and the collector electrode of the NPN transistor VT2 is connected with the direct current relay control and protection circuit; the direct current relay control and protection circuit consists of a direct current relay J and a silicon rectifier diode D1, wherein a collector electrode of an NPN transistor VT2 is connected with one end of a coil of the direct current relay J and the positive electrode of the silicon rectifier diode D1, and the other end of the coil of the relay J and the negative electrode of the silicon rectifier diode D1 are connected with a circuit positive electrode VCC; the positive pole of the 12V direct current power supply is connected with the positive pole VCC of the circuit, and the negative pole of the 12V direct current power supply is connected with the ground GND of the circuit. The change of the photoresistor controls the on and off of the NPN transistor to control the switch of the relay by setting the threshold value of illumination to the NPN transistor, thereby controlling the switch of the light source.
The influence of ambient stray light on the photoresistor after the light source is lighted is not considered in the existing photoswitch technology, for example, far light, suddenly changed light and the like can lead to the reduction of the resistance value of the photoresistor, if the illuminance of the light is higher than a set threshold value, the light source can be extinguished, and the light source is lighted again after being extinguished, so that the phenomenon of multiple times of lighting and extinguishing is caused, and the service life of an electronic device and the light source can be influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a light-operated switch circuit of an LED lamp, which considers the influence of stray light of external light or sudden change of external light, controls an LED light source not to be extinguished within the set two illumination intensity threshold ranges, and avoids the phenomenon of repeated on-off caused by the stray light of external light or the sudden change of external light.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a light-operated switch circuit of LED lamp which characterized in that: the LED lamp comprises a power supply circuit, a light-operated main circuit, a light-operated loop and a light-operated output circuit, wherein the input end of the power supply circuit is connected with a power supply voltage, the output end of the power supply circuit provides working voltages for the light-operated main circuit and the light-operated loop, the light-operated main circuit is connected with the light-operated loop, the output end of the light-operated main circuit is connected with the input end of the light-operated output circuit, the output end of the light-operated output circuit is connected with a driving main circuit in a driving circuit of an LED lamp, and when the illumination intensity of external light is smaller than a set first illumination intensity threshold value, the output end of the light-operated main circuit outputs a low level to control the light-operated output circuit, so that the output end of the driving main circuit in the driving circuit of the LED lamp outputs a high level, and the LED light source of the LED lamp is lightened; when the illumination intensity of the external light is greater than a set second illumination intensity threshold value, the output end of the light-control main circuit outputs a high level to control the light-control output circuit, so that the output end of the driving main circuit in the driving circuit of the LED lamp outputs a low level, and the LED light source of the LED lamp is turned off; the light control loop feeds back the signal of the light control main circuit, so that when the illumination intensity of the external light is larger than or equal to the set first illumination intensity threshold value and smaller than or equal to the set second illumination intensity threshold value, the LED light source of the LED lamp is not extinguished, and the parasitic light of the external light or the sudden change of the external light is prevented from extinguishing the LED light source of the LED lamp.
The input end of the power supply circuit is connected with 12V power supply voltage, the output end of the power supply circuit provides 5V working voltage for the light-operated main circuit and the light-operated loop, the power supply circuit is composed of a first resistor, a second triode, a fifth resistor, a first capacitor, a second capacitor and a voltage stabilizing diode, one end of the first resistor is the input end of the power supply circuit, the other end of the first resistor is connected with a collector electrode of the second triode and one end of the fifth resistor respectively, a base electrode of the second triode is connected with the other end of the fifth resistor and a cathode electrode of the voltage stabilizing diode respectively, an emitter electrode of the second triode is connected with one end of the first capacitor and one end of the second capacitor respectively, and a public connection end of the second triode is the output end of the power supply circuit, and the other end of the voltage stabilizing diode, the other end of the first capacitor and the other end of the second capacitor are grounded. The power supply circuit can supply power for the light-control main circuit and the light-control loop after reducing the voltage of the 12V power supply to 5V.
The light-operated main circuit consists of a photosensitive diode, a second resistor, a third resistor, a fourth resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a third capacitor and a first voltage comparator, wherein the negative electrode of the photosensitive diode is respectively connected with the output end of the power supply circuit and one end of the second resistor, the positive electrode of the photosensitive diode is respectively connected with one end of the third resistor, the other end of the third resistor is respectively connected with one end of the third resistor, one end of the ninth resistor and one end of the fourth resistor, a common connection end is used as a first loop external contact and is connected with the light-operated loop, the other end of the third resistor and the other end of the ninth resistor are grounded, the other end of the second resistor is respectively connected with one end of the eighth resistor and one end of the first voltage comparator, the other end of the eighth resistor is respectively connected with the opposite input end of the tenth resistor, the other end of the eighth resistor is respectively connected with the other end of the tenth resistor, the common connection end of the fourth resistor is used as a light-operated loop, the common connection end of the fourth resistor is connected with the other end of the fourth resistor, the common connection end of the fourth resistor is used as a light-operated loop, the common connection end of the fourth resistor is connected with the output end of the fourth resistor, the common connection end of the fourth resistor is connected with the light-operated loop, the power end of the first voltage comparator is connected with the output end of the power supply circuit, and the grounding end of the first voltage comparator is grounded. The third resistor and the ninth resistor form a first group of resistors, the voltage of the first group of resistors (namely, the voltage between the third resistor and the ninth resistor) is input to the positive input end of the first voltage comparator, the second resistor, the eighth resistor and the tenth resistor form a second group of resistors, the voltage of the second group of resistors (namely, the voltage between the second resistor and the eighth resistor) is input to the inverting input end of the first voltage comparator, the voltage is used as the reference voltage of the inverting input end of the first voltage comparator, and when the voltage of the positive input end of the first voltage comparator is larger than the voltage of the inverting input end of the first voltage comparator, namely, the reference voltage, the output end of the first voltage comparator outputs a high level (5V); when the voltage of the non-inverting input terminal of the first voltage comparator is less than or equal to the voltage of the inverting input terminal of the first voltage comparator, namely, the reference voltage, the output terminal of the first voltage comparator outputs a low level (0V).
The light-operated loop consists of a diode and a second voltage comparator, the positive electrode of the diode is connected with a second loop external connection point of the light-operated main circuit, the negative electrode of the diode is connected with the output end of the second voltage comparator, the reverse phase input end of the second voltage comparator is connected with a third loop external connection point of the light-operated main circuit, the positive phase input end of the second voltage comparator is connected with a first loop external connection point of the light-operated main circuit, the power end of the second voltage comparator is connected with the output end of the power supply circuit, and the grounding end of the second voltage comparator is grounded. When the output end of the light-operated main circuit, namely the output end of the first voltage comparator, outputs a high level (5V) to the inverting input end of the second voltage comparator, the output end of the second voltage comparator outputs a low level (0V) because the voltage of the non-inverting input end of the second voltage comparator is smaller than 5V, at the moment, the diode is conducted, the voltage of the eleventh resistor in the light-operated main circuit is input to the inverting input end of the first voltage comparator, so that the reference voltage of the first voltage comparator is changed (reduced), the changed reference voltage is lower than the reference voltage before being changed, the reference voltage before being changed is taken as an initial threshold value, the changed reference voltage is taken as a second threshold value, and the change of the illumination intensity of external light does not influence the LED light source within the range from the second threshold value to the initial threshold value; when the output end of the light-operated main circuit, namely the output end of the first voltage comparator, outputs low level (0V) to the inverting input end of the second voltage comparator, the voltage of the non-inverting input end of the second voltage comparator is larger than 0V, so that the output end of the second voltage comparator outputs high level (5V), the diode is cut off, and the reference voltage of the first voltage comparator returns to the initial threshold value.
The light-operated output circuit consists of a sixth resistor, a seventh resistor and a first triode, wherein one end of the sixth resistor is the input end of the light-operated output circuit and is connected with the output end of the light-operated main circuit, the other end of the sixth resistor is respectively connected with one end of the seventh resistor and the base electrode of the first triode, the other end of the seventh resistor and the emitter electrode of the first triode are grounded, and the collector electrode of the first triode is connected with the output end of the light-operated output circuit and the driving main circuit in the driving circuit of the LED lamp. When the output end of the light-operated main circuit, namely the output end of the first voltage comparator, outputs high level (5V), the first triode is conducted, the driving main circuit in the driving circuit does not output, and the LED light source is not lightened; when the output end of the light-operated main circuit, namely the output end of the first voltage comparator, outputs low level (0V), the first triode is cut off, the driving main circuit in the driving circuit outputs high level, and the LED light source is lighted.
The set first illumination intensity threshold value is 10lux, and the set second illumination intensity threshold value is 60lux.
Compared with the prior art, the invention has the advantages that:
when the illumination intensity of external light is smaller than a set first illumination intensity threshold value, the output end of the light-control main circuit outputs a low level to control the light-control output circuit, so that the output end of the driving main circuit in the driving circuit of the LED lamp outputs a high level, and the LED light source of the LED lamp is lightened; when the illumination intensity of the external light is larger than the set second illumination intensity threshold value, the output end of the light-control main circuit outputs a high level to control the light-control output circuit, so that the output end of the driving main circuit in the driving circuit of the LED lamp outputs a low level, and the LED light source of the LED lamp is turned off; the light control loop feeds back signals of the light control main circuit, so that when the illumination intensity of external light is greater than or equal to a set first illumination intensity threshold value and less than or equal to a set second illumination intensity threshold value, the LED light source of the LED lamp cannot be extinguished, stray light of the external light or sudden change of the external light is effectively prevented from extinguishing the LED light source of the LED lamp, multiple on-off phenomena are avoided, and the service lives of the electronic device and the LED light source are prolonged.
Drawings
FIG. 1 is a circuit diagram of a photoswitch circuit of the present invention;
FIG. 2 is a schematic diagram of the connection of a driving circuit of an LED lamp using the photoswitch circuit of the present invention and the photoswitch circuit of the present invention;
fig. 3 is a graph showing the intensity of external light corresponding to the change of voltage at the external junction of the first loop in the photo-control main circuit in the photo-control switch circuit of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 2, the LED lamp comprises a driving circuit, an LED light source 4 and a light-operated switch circuit 5, wherein the driving circuit is composed of a rectifying and filtering circuit 1, a driving main circuit 2 and a rectifying and outputting circuit 3, the input end of the rectifying and filtering circuit 1 is connected with commercial alternating current (100-277V), the output end of the rectifying and filtering circuit 1 is connected with the input end of the driving main circuit 2, the output end of the driving main circuit 2 is connected with the input end of the rectifying and outputting circuit 3, the output end of the rectifying and outputting circuit 3 is connected with the LED light source 4, and the light-operated switch circuit 5 is connected with the driving main circuit 2; the commercial alternating current (100-277V) is converted into direct current through the rectifying and filtering circuit 1, proper voltage and current are obtained through driving the main circuit 2, power is transmitted to the LED light source 4 through the rectifying and outputting circuit 3, and the light-operated switch circuit 5 sends out a signal to control and drive the main circuit 2, so that the rectifying and outputting circuit 3 is controlled to control the on and off of the LED light source 4.
The invention provides a photoswitch circuit of an LED lamp, as shown in figure 1, which comprises a power supply circuit 51, a photosystem 52, a photosircuit loop 53 and a photoswitch output circuit 54, wherein the input end of the power supply circuit 51 is connected with a power supply voltage, the output end of the power supply circuit 51 provides working voltages for the photosystem 52 and the photosircuit loop 53, the photosystem 52 is connected with the photosystem 53, the output end of the photosystem 52 is connected with the input end of the photosystem 54, the output end of the photosystem 54 is connected with a driving main circuit 2 in a driving circuit of the LED lamp, when the illumination intensity of external light is smaller than a set first illumination intensity threshold value, the output end of the photosystem 52 outputs a low level to control the photoswitch 54, and the output end of the driving main circuit 2 in the driving circuit of the LED lamp outputs a high level, so that an LED light source 4 of the LED lamp is lightened; when the illumination intensity of the external light is greater than the set second illumination intensity threshold, the output end of the light-control main circuit 52 outputs a high level to control the light-control output circuit 54, so that the output end of the driving main circuit 2 in the driving circuit of the LED lamp outputs a low level, and the LED light source 4 of the LED lamp is turned off; the light control loop 53 feeds back the signal of the light control main circuit 52, so that the LED light source 4 of the LED lamp will not be extinguished when the illumination intensity of the external light is greater than or equal to the set first illumination intensity threshold value and less than or equal to the set second illumination intensity threshold value, so as to prevent the parasitic light of the external light or the abrupt change of the external light from extinguishing the LED light source 4 of the LED lamp. Here, the first illumination intensity threshold value is set to 10lux, and the second illumination intensity threshold value is set to 60lux.
In this embodiment, the input end of the power supply circuit 51 is connected to a 12V power supply voltage, the output end of the power supply circuit 51 provides 5V working voltage for the light-operated main circuit 52 and the light-operated loop 53, the power supply circuit 51 is composed of a first resistor R1, a second triode Q2, a fifth resistor R5, a first capacitor C1, a second capacitor C2 and a zener diode Z1, one end of the first resistor R1 is the input end of the power supply circuit 51, the other end of the first resistor R1 is connected to the collector of the second triode Q2 and one end of the fifth resistor R5 respectively, the base of the second triode Q2 is connected to the other end of the fifth resistor R5 and one end of the zener diode Z1 respectively, the emitter of the second triode Q2 is connected to one end of the first capacitor C1 and one end of the second capacitor C2 respectively, and the common connection end is the output end of the power supply circuit 51, and the other ends of the zener diode Z1, the other end of the first capacitor C1 and the second capacitor C2 are all grounded to GND. The power supply circuit 51 may supply power to the photocontrol main circuit 52 and the photocontrol loop 53 after the 12V supply voltage is reduced to 5V.
In this embodiment, the photo-control main circuit 52 is composed of a photo diode DL1, a second resistor R2, a third resistor R3, a fourth resistor R4, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a third capacitor C3 and a first voltage comparator U1, the cathode of the photo diode DL1 is connected to the output end of the power supply circuit 51 and one end of the second resistor R2, the anode of the photo diode DL1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to one end of the third capacitor C3, one end of the ninth resistor R9 and one end of the fourth resistor R4, the common connection end is connected to the photo-control loop 53 as a first loop external contact, the other end of the third capacitor C3 and the other end of the ninth resistor R9 are all grounded GND, the other end of the second resistor R2 is connected to one end of the eighth resistor R8 and the inverting input end of the first voltage comparator U1, the other end of the eighth resistor R8 is respectively connected with one end of the tenth resistor R10 and one end of the eleventh resistor R11, the other end of the tenth resistor R10 is grounded GND, the other end of the eleventh resistor R11 is used as a second loop external contact and connected with the light-operated loop 53, the other end of the fourth resistor R4 is connected with the positive input end of the first voltage comparator U1, one end of the twelfth resistor R12 is connected with the output end of the power supply circuit 51, the other end of the twelfth resistor R12 is connected with the output end of the first voltage comparator U1, the common connection end is the output end of the light-operated main circuit 52 and the input end of the light-operated output circuit 54, the other end of the tenth resistor R11 is used as a third loop external contact and connected with the light-operated loop 53, the power end of the first voltage comparator U1 is connected with the output end of the power supply circuit 51, the ground of the first voltage comparator U1 is grounded GND, the third resistor R3 and the ninth resistor R9 form a first group of resistors, the voltage of the first group of resistors (i.e., the voltage between the third resistor R3 and the ninth resistor R9) is input to the positive input end of the first voltage comparator U1, the second resistor R2, the eighth resistor R8 and the tenth resistor R10 form a second group of resistors, the voltage of the second group of resistors (i.e., the voltage between the second resistor R2 and the eighth resistor R8) is input to the negative input end of the first voltage comparator U1, the voltage is used as the reference voltage of the negative input end of the first voltage comparator U1, and when the voltage of the positive input end of the first voltage comparator U1 is greater than the voltage of the negative input end of the first voltage comparator U1, i.e., the reference voltage, the output end of the first voltage comparator U1 outputs a high level (5V); when the voltage of the non-inverting input terminal of the first voltage comparator U1 is less than or equal to the voltage of the inverting input terminal of the first voltage comparator U1, that is, the reference voltage, the output terminal of the first voltage comparator U1 outputs a low level (0V).
In this embodiment, the light-operated loop 53 is composed of a diode D1 and a second voltage comparator U2, the anode of the diode D1 is connected to the second loop external connection point of the light-operated main circuit 52, the cathode of the diode D1 is connected to the output end of the second voltage comparator U2, the inverting input end of the second voltage comparator U2 is connected to the third loop external connection point of the light-operated main circuit 52, the non-inverting input end of the second voltage comparator U2 is connected to the first loop external connection point of the light-operated main circuit 52, the power end of the second voltage comparator U2 is connected to the output end of the power supply circuit 51, and the ground of the second voltage comparator U2 is grounded to GND. Here, when the output terminal of the photo-control main circuit 52, i.e., the output terminal of the first voltage comparator U1, outputs a high level (5V) to the inverting input terminal of the second voltage comparator U2, since the voltage at the non-inverting input terminal of the second voltage comparator U2 is less than 5V, the output terminal of the second voltage comparator U2 outputs a low level (0V), at this time, the diode D1 is turned on, and the voltage of the eleventh resistor R11 in the photo-control main circuit 52 is input to the inverting input terminal of the first voltage comparator U1, thereby changing (reducing) the reference voltage of the first voltage comparator U1, the changed reference voltage is lower than the reference voltage before the change, the reference voltage before the change is taken as the initial threshold, and the changed reference voltage is taken as the second threshold, within the range from the second threshold to the initial threshold, the change of the illumination intensity of the external light does not affect the LED light source 4; when the output terminal of the photo-control main circuit 52, i.e. the output terminal of the first voltage comparator U1, outputs a low level (0V) to the inverting input terminal of the second voltage comparator U2, the output terminal of the second voltage comparator U2 outputs a high level (5V) because the voltage of the non-inverting input terminal of the second voltage comparator U2 is greater than 0V, at this time, the diode D1 is turned off, and the reference voltage of the first voltage comparator U1 returns to the initial threshold.
In this embodiment, the photo-controlled output circuit 54 is composed of a sixth resistor R6, a seventh resistor R7 and a first triode Q1, wherein one end of the sixth resistor R6 is an input end of the photo-controlled output circuit 54 and is connected with an output end of the photo-controlled main circuit 52, the other end of the sixth resistor R6 is respectively connected with one end of the seventh resistor R7 and a base electrode of the first triode Q1, the other end of the seventh resistor R7 and an emitter electrode of the first triode Q1 are both grounded GND, and a collector electrode of the first triode Q1 is connected with a driving main circuit 2 in a driving circuit of the LED lamp. Here, when the output end of the light-operated main circuit 52, that is, the output end of the first voltage comparator U1 outputs a high level (5V), the first triode Q1 is turned on, the driving main circuit 2 in the driving circuit does not output, and the LED light source 4 is not lighted; when the output end of the light control main circuit 52, i.e., the output end of the first voltage comparator U1 outputs a low level (0V), the first triode Q1 is turned off, the driving main circuit 2 in the driving circuit outputs a high level, and the LED light source 4 is turned on.
In this embodiment, the first triode Q1 and the second triode Q2 are NPN type triodes, and the model is 2N5551 type; the model of the light sensitive diode DL1 is SY 3103-D3; the first voltage comparator U1 and the second voltage comparator U2 are both voltage comparators of model LM393, and their power supply terminals are connected to the output terminal of the power supply circuit 51, and their ground terminals are grounded to GND.
Table 1 shows a table of the change correspondence of the illumination intensity of the external light to the voltage at the external junction of the first loop in the photoswitch circuit; fig. 3 shows a graph of the intensity of the external light versus the voltage at the external junction of the first loop in the photocontrol main circuit in the photocontrol switch circuit. As can be seen from table 1 and fig. 3, the voltage at the external junction of the first loop in the photo-control main circuit 52 varies to decrease with decreasing illumination intensity of the external light. The light-operated switch circuit 5 can set an initial threshold value of the first voltage comparator U1 according to the illumination intensity of the external light, if the illumination intensity of the external light is set to be larger than 60lux, the light is turned off, when the illumination intensity of the external light is smaller than 10lux, the initial threshold value is set to be 2.8V, the second threshold value is set to be 1.2V, the light is turned off from daytime to evening (when the illumination intensity is smaller than 10 lux), the light is turned on, the light cannot be turned off after the illumination intensity is changed from 10lux to 60lux, and the light is turned off until the illumination intensity is larger than 60lux, so that the parasitic light of the external light or abrupt change of the light can be prevented from extinguishing the LED light source 4.
TABLE 1 variation correspondence table of illumination intensity of external light and voltage at external junction of first loop in light-controlled main circuit in light-controlled switch circuit
| Intensity of external light (lux) | Voltage (V) at external junction of first loop |
| 70 | 3.1 |
| 65 | 2.9 |
| 60 | 2.8 |
| 55 | 2.6 |
| 50 | 2.4 |
| 45 | 2.2 |
| 40 | 2.0 |
| 35 | 1.8 |
| 30 | 1.7 |
| 25 | 1.6 |
| 20 | 1.5 |
| 15 | 1.4 |
| 10 | 1.2 |
| 5 | 1.0 |
| 3 | 0.9 |
| 2 | 0.8 |
| 1 | 0.75 |
The working principle of the light-operated switch circuit 5 is as follows: the voltage 2.8V between the second resistor R2 and the eighth resistor R8 is used as the reference voltage of the inverting input end of the first voltage comparator U1, the reference voltage is set to be an initial threshold value, when the illumination intensity of external light is larger than 60lux, the voltage between the third resistor R3 and the ninth resistor R9 is larger than 2.8V, at the moment, the voltage input by the non-inverting input end of the first voltage comparator U1 is larger than the voltage input by the inverting input end (initial threshold value), the output end of the first voltage comparator U1 outputs high level (5V), the first triode Q1 in the light control output circuit 54 is conducted, the driving main circuit 2 in the driving circuit is grounded, the driving main circuit 2 is not output, and the LED light source 4 is not lightened; meanwhile, the voltage input by the inverting input end of the second voltage comparator U2 is at a high level (5V), the voltage input by the non-inverting input end of the second voltage comparator U2 is greater than 2.8V but less than 5V between the third resistor R3 and the ninth resistor R9, the output end of the second voltage comparator U2 outputs a low level, the diode D1 is turned on, at this time, the voltage input by the inverting input end of the first voltage comparator U1 changes from an initial threshold value to a voltage 1.2V between the second resistor R2 and the eighth resistor R8 (corresponding to the voltage between the third resistor R3 and the ninth resistor R9 as a second threshold value when the illumination intensity of external light is 10 lux), and therefore, the reference voltage of the first voltage comparator U1 changes from 2.8V to 1.2V, and the LED light source 4 is not on all the time in this interval; only when the illumination intensity of the external light is lower than 10lux, the voltage input by the non-inverting input end of the first voltage comparator U1 is smaller than 1.2V, the output end of the first voltage comparator U1 outputs low level (0V), the first triode Q1 in the light-operated output circuit 54 is cut off, the driving main circuit 2 in the driving circuit outputs high level, the LED light source 4 is lightened, at the moment, the output end of the second voltage comparator U2 outputs high level (5V), the diode D1 is cut off, the reference voltage of the first voltage comparator U1 is restored to the initial threshold value 2.8V, the change of the illumination intensity of the external light from 10lux to 60lux does not lead to the extinction of the LED light source 4, and the extinction of the LED light source 4 can be prevented only when the illumination intensity of the external light is higher than 60lux.
Claims (4)
1. The utility model provides a light-operated switch circuit of LED lamp which characterized in that: the LED lamp comprises a power supply circuit, a light-operated main circuit, a light-operated loop and a light-operated output circuit, wherein the input end of the power supply circuit is connected with a power supply voltage, the output end of the power supply circuit provides working voltages for the light-operated main circuit and the light-operated loop, the light-operated main circuit is connected with the light-operated loop, the output end of the light-operated main circuit is connected with the input end of the light-operated output circuit, the output end of the light-operated output circuit is connected with a driving main circuit in a driving circuit of an LED lamp, and when the illumination intensity of external light is smaller than a set first illumination intensity threshold value, the output end of the light-operated main circuit outputs a low level to control the light-operated output circuit, so that the output end of the driving main circuit in the driving circuit of the LED lamp outputs a high level, and the LED light source of the LED lamp is lightened; when the illumination intensity of the external light is greater than a set second illumination intensity threshold value, the output end of the light-control main circuit outputs a high level to control the light-control output circuit, so that the output end of the driving main circuit in the driving circuit of the LED lamp outputs a low level, and the LED light source of the LED lamp is turned off; the light control loop feeds back the signal of the light control main circuit, so that when the illumination intensity of the external light is greater than or equal to a set first illumination intensity threshold value and less than or equal to a set second illumination intensity threshold value, the LED light source of the LED lamp is not extinguished, and the parasitic light of the external light or the sudden change of the external light is prevented from extinguishing the LED light source of the LED lamp;
the light-operated main circuit consists of a photosensitive diode, a second resistor, a third resistor, a fourth resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a third capacitor and a first voltage comparator, wherein the negative electrode of the photosensitive diode is respectively connected with the output end of the power supply circuit and one end of the second resistor, the positive electrode of the photosensitive diode is respectively connected with one end of the third resistor, the other end of the third resistor is respectively connected with one end of the third resistor, one end of the ninth resistor and one end of the fourth resistor, a common connection end is used as a first loop external contact and is connected with the light-operated loop, the other end of the third resistor and the other end of the ninth resistor are grounded, the other end of the second resistor is respectively connected with one end of the eighth resistor and one end of the first voltage comparator, the other end of the eighth resistor is respectively connected with the opposite input end of the tenth resistor, the other end of the eighth resistor is respectively connected with the other end of the tenth resistor, the common connection end of the fourth resistor is used as a light-operated loop, the common connection end of the fourth resistor is connected with the other end of the fourth resistor, the common connection end of the fourth resistor is used as a light-operated loop, the common connection end of the fourth resistor is connected with the output end of the fourth resistor, the common connection end of the fourth resistor is connected with the light-operated loop, the power end of the first voltage comparator is connected with the output end of the power supply circuit, and the grounding end of the first voltage comparator is grounded;
the light-operated loop consists of a diode and a second voltage comparator, the positive electrode of the diode is connected with a second loop external connection point of the light-operated main circuit, the negative electrode of the diode is connected with the output end of the second voltage comparator, the reverse phase input end of the second voltage comparator is connected with a third loop external connection point of the light-operated main circuit, the positive phase input end of the second voltage comparator is connected with a first loop external connection point of the light-operated main circuit, the power end of the second voltage comparator is connected with the output end of the power supply circuit, and the grounding end of the second voltage comparator is grounded.
2. The light-operated switch circuit of an LED lamp of claim 1, wherein: the input end of the power supply circuit is connected with 12V power supply voltage, the output end of the power supply circuit provides 5V working voltage for the light-operated main circuit and the light-operated loop, the power supply circuit is composed of a first resistor, a second triode, a fifth resistor, a first capacitor, a second capacitor and a voltage stabilizing diode, one end of the first resistor is the input end of the power supply circuit, the other end of the first resistor is connected with a collector electrode of the second triode and one end of the fifth resistor respectively, a base electrode of the second triode is connected with the other end of the fifth resistor and a cathode electrode of the voltage stabilizing diode respectively, an emitter electrode of the second triode is connected with one end of the first capacitor and one end of the second capacitor respectively, and a public connection end of the second triode is the output end of the power supply circuit, and the other end of the voltage stabilizing diode, the other end of the first capacitor and the other end of the second capacitor are grounded.
3. The light-operated switch circuit of an LED lamp of claim 1, wherein: the light-operated output circuit consists of a sixth resistor, a seventh resistor and a first triode, wherein one end of the sixth resistor is the input end of the light-operated output circuit and is connected with the output end of the light-operated main circuit, the other end of the sixth resistor is respectively connected with one end of the seventh resistor and the base electrode of the first triode, the other end of the seventh resistor and the emitter electrode of the first triode are grounded, and the collector electrode of the first triode is connected with the output end of the light-operated output circuit and the driving main circuit in the driving circuit of the LED lamp.
4. The light-operated switch circuit of an LED lamp of claim 1, wherein: the set first illumination intensity threshold value is 10lux, and the set second illumination intensity threshold value is 60lux.
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| CN107277971A (en) | 2017-10-20 |
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