CN217721154U - Control circuit for automatically adjusting infrared emission power - Google Patents
Control circuit for automatically adjusting infrared emission power Download PDFInfo
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Abstract
The utility model discloses a control circuit of infrared emission power automatic adjustment, wherein infrared gesture control circuit includes: an infrared device adapted to emit infrared rays and receive reflected infrared rays; the infrared detection module is suitable for acquiring infrared signals in an external environment so as to acquire the intensity of infrared rays in the current environment; and the control module is respectively electrically connected with the infrared detection module and the infrared device, and controls the infrared device to adjust the power of transmitting infrared rays according to the intensity of the current environment infrared rays. The infrared signal interference prevention device is simple in structure, and can improve the signal-to-noise ratio of the infrared signal by automatically adjusting the infrared emission power, so that the infrared signal is effectively prevented from being interfered.
Description
Technical Field
The utility model relates to an infrared ray sensor technical field especially relates to a control circuit of infrared emission power automatic adjustment.
Background
In the related art, most of gesture recognition functions applied to the range hoods are realized based on infrared ray transceiving, the kitchen lighting system adopts an LED lamp, a three-primary-color incandescent lamp and a traditional bulb, the LED lamp, the three-primary-color incandescent lamp and the traditional bulb can emit certain infrared radiation when the kitchen lighting system is lightened except infrared rays in natural light, and the three-primary-color incandescent lamp is particularly obvious. According to the gesture function cigarette machine based on the infrared transceiving principle, when the infrared transmitting power is unchanged, under sunlight or high light of a tricolor incandescent lamp, signals of a gesture infrared device are interfered, the signal to noise ratio is reduced, the sensing distance is shortened and even fails, and the gesture recognition experience and the scene application are directly influenced.
Disclosure of Invention
The utility model discloses aim at solving one of the problems that exist among the prior art to a certain extent at least, for this reason, the utility model provides a control circuit of infrared emission power automatic adjustment, its simple structure through automatic adjustment infrared emission power in order to promote infrared signal SNR to effectively avoid infrared signal to receive the interference.
The above purpose is realized by the following technical scheme:
a control circuit for automatic adjustment of infrared emission power, comprising:
an infrared device adapted to emit infrared rays and receive reflected infrared rays;
the infrared detection module is suitable for acquiring infrared signals in an external environment so as to acquire the intensity of infrared rays in the current environment;
and the control module is respectively electrically connected with the infrared detection module and the infrared device, and controls the infrared device to adjust the power of transmitting infrared rays according to the intensity of the current environment infrared rays.
In some embodiments, the infrared device includes two sets of infrared transmitters and infrared receivers arranged in a one-to-one correspondence, where the infrared transmitter includes a first infrared transmitting module and a second infrared transmitting module respectively located at two opposite positions, the infrared receiver includes a first infrared receiving module and a second infrared receiving module respectively located at two opposite positions, and the first infrared transmitting module, the second infrared transmitting module, the first infrared receiving module, and the second infrared receiving module are electrically connected to the control module respectively.
In some embodiments, the first infrared emission module and the second infrared emission module have the same structure, wherein the first infrared emission module includes an emission tube, and a switch unit and a power adjustment unit that are electrically connected to the emission tube and the control module, respectively, the power adjustment unit is configured to adjust an infrared emission power of the emission tube, and the switch unit controls the emission tube to operate according to the adjusted infrared emission power.
In some embodiments, the switching unit includes a first transistor and a first resistor, wherein a base of the first transistor is connected to the control module through the first resistor, an emitter of the first transistor is grounded, and a collector of the first transistor is connected to a cathode of the emitter.
In some embodiments, the power adjustment unit includes a power sub-unit and two structurally identical power adjustment sub-units, wherein,
the power subunit comprises a tenth resistor, one end of the tenth resistor is connected with the anode of the transmitting tube, and the other end of the tenth resistor is connected with an external power supply;
the power adjusting subunit comprises a second triode, a second resistor, a third resistor and a fourth resistor, wherein a collector of the second triode is connected with the anode of the emission tube through the second resistor, a base of the second triode is connected with the control module through the third resistor, an emitter of the second triode is connected with an external power supply, and the fourth resistor is bridged between the base and the emitter of the second triode.
In some embodiments, the first infrared receiving module and the second infrared receiving module have the same structure, wherein the first infrared receiving module includes a receiving device, a fifth resistor, a sixth resistor, a first capacitor and a seventh resistor, wherein a signal output terminal of the receiving device is connected to the control module through the fifth resistor, one end of the sixth resistor is connected to the signal output terminal of the receiving device, the other end of the sixth resistor is connected to an external power source, the first capacitor is connected to the fifth resistor in parallel, a power negative terminal of the receiving device is grounded, and a power positive terminal of the receiving device is connected to the external power source through the seventh resistor.
In some embodiments, the infrared detection module includes an eighth resistor, an infrared receiving tube, a ninth resistor, and a second capacitor, where one end of the eighth resistor is connected to an external power source, the other end of the eighth resistor is grounded through the infrared receiving tube, one end of the ninth resistor is connected to the anode of the infrared receiving tube, the other end of the ninth resistor is connected to the control module, one end of the second capacitor is connected to the cathode of the infrared receiving tube, and the other end of the second capacitor is connected to the control module.
Compared with the prior art, the utility model discloses an at least including following beneficial effect:
1. the utility model discloses infrared emission power automatic adjustment's control circuit, its simple structure is through automatic adjustment infrared emission power in order to promote the infrared signal SNR to effectively avoid infrared signal to receive the interference.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following descriptions are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of a first infrared emission module in an embodiment of the present invention;
FIG. 2 is a circuit diagram of a second IR emitting module according to an embodiment of the present invention
Fig. 3 is a circuit diagram of a first infrared receiving module in an embodiment of the present invention
Fig. 4 is a circuit diagram of a first infrared receiving module in an embodiment of the present invention;
fig. 5 is a circuit diagram of an infrared detection module according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of the control method of the infrared gesture control circuit in the embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the scope of the claimed technical solution of the present invention.
To make the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in detail below, clearly and completely, and obviously, the described embodiments are part of, but not all embodiments of the present invention. The components of embodiments of the present invention may be arranged and designed in a variety of different configurations.
The present invention is illustrated by the following examples, but the present invention is not limited to these examples. To the embodiment of the present invention, the technical features can be modified or replaced by other parts without departing from the spirit of the present invention, which is covered by the scope of the technical solution of the present invention.
The first embodiment is as follows:
as shown in fig. 1 to 5, the present embodiment provides a control circuit for automatically adjusting infrared emission power, including:
an infrared device adapted to emit infrared rays and receive reflected infrared rays;
the infrared detection module is suitable for collecting infrared signals in an external environment so as to acquire the intensity of infrared rays in the current environment;
and the control module is electrically connected with the infrared detection module and the infrared device respectively, and controls the infrared device to adjust the power of transmitting infrared rays according to the intensity of the current environment infrared rays.
In this embodiment, through the strong and weak of infrared ray signal in detecting external environment in order to acquire infrared intensity, adjust with the infrared emission power of automatic adaptation according to infrared intensity to gesture infrared emission signal power to solve infrared gesture range hood and lead to the shortcoming that infrared induction distance shortens under natural light or tricolor lamp illumination, its simple structure through the infrared emission power of automatic adjustment in order to promote infrared signal SNR, thereby effectively avoid infrared signal to receive the interference.
In this embodiment, the infrared gesture control circuit is preferably applied to a range hood or other devices equipped with an infrared sensor, and the infrared gesture control circuit is described in this embodiment by way of example as being applied to a range hood, and further description is omitted.
Further, the infrared device comprises two sets of infrared transmitters and two sets of infrared receivers which are arranged in a one-to-one correspondence manner, wherein each infrared transmitter comprises a first infrared transmitting module and a second infrared transmitting module which are respectively located at two opposite positions, each infrared receiver comprises a first infrared receiving module and a second infrared receiving module which are respectively located at two opposite positions, and the first infrared transmitting module, the second infrared transmitting module, the first infrared receiving module and the second infrared receiving module are respectively electrically connected with the control module.
Preferably, the first infrared emission module and the second infrared emission module have the same structure, wherein:
the first infrared emission module comprises a first emission tube LED1, a first switch unit and a first power adjustment unit, wherein the first switch unit and the first power adjustment unit are respectively and electrically connected with the first emission tube LED1 and the control module, the first power adjustment unit is connected with the anode of the first emission tube LED1 so as to adjust the infrared emission power of the first emission tube LED1, and the first switch unit controls the first emission tube LED1 to work according to the adjusted infrared emission power;
the second infrared emission module comprises a second emission tube LED2, a second switch unit and a second power adjusting unit, wherein the second switch unit and the second power adjusting unit are respectively electrically connected with the second emission tube LED2 and the control module, the second power adjusting unit is connected with the anode of the second emission tube LED2 to adjust the infrared emission power of the second emission tube LED2, and the second switch unit controls the second emission tube LED2 to work according to the adjusted infrared emission power.
Specifically, the first switch unit and the second switch unit have the same structure, wherein:
the first switch unit comprises a first triode Q1 and a first fifth resistor R13, wherein the base electrode of the first triode Q1 is connected with the control module through the first fifth resistor R13, the emitting electrode of the first triode Q1 is grounded, and the collecting electrode of the first triode Q1 is connected with the negative electrode of the first emitting tube LED 1;
the second switch unit comprises a triode Q4 and a fifth resistor R11, wherein the base of the triode Q4 is connected with the control module through the fifth resistor R11, the emitting electrode of the triode Q4 is grounded, and the collecting electrode of the triode Q4 is connected with the negative electrode of the second emitting tube LED 2.
Preferably, the first power adjusting unit includes a power sub-unit and two power adjusting sub-units with the same structure, wherein:
the first power subunit comprises a tenth fifth resistor R14, one end of the tenth fifth resistor R14 is connected with the first emitting tube LED1, and the other end of the tenth fifth resistor R14 is connected with an external power supply;
the power supply circuit comprises a first power adjustment subunit, a second power adjustment subunit and a third power adjustment subunit, wherein the first power adjustment subunit comprises a second triode Q2, a second fifth resistor R19, a third fifth resistor R18 and a fourth fifth resistor R15, a collector of the second triode Q2 is connected with the anode of the first emission tube LED1 through the second fifth resistor R19, a base of the second triode Q2 is connected with the control module through the third fifth resistor R18, an emitter of the triode Q2 is connected with an external power supply, and the fourth fifth resistor R15 is bridged between the base and the emitter of the second triode Q2;
the second power adjustment subunit comprises a triode Q3, a sixth resistor R20, a fifth resistor R17 and a fifth resistor R16, a collector of the triode Q3 is connected with the anode of the first emitting tube LED1 through the sixth resistor R20, a base of the triode Q3 is connected with the control module through the fifth resistor R17, an emitting electrode of the triode Q3 is connected with an external power supply, and the fifth resistor R16 is bridged between the base and the emitting electrode of the triode Q3.
Further, the second power adjusting unit includes a power sub-unit and two power adjusting sub-units with the same structure, wherein:
the second power subunit comprises a fifth resistor R12, one end of the fifth resistor R12 is connected with the anode of the second emission tube LED2, and the other end of the fifth resistor R12 is connected with an external power supply;
the third power adjustment subunit comprises a triode Q5, a sixth resistor R21, a sixth resistor R24 and a sixth resistor R23, wherein a collector of the triode Q5 is connected with the anode of the second emission tube LED2 through the sixth resistor R21, a base of the triode Q5 is connected with the control module through the sixth resistor R24, an emitter of the triode Q5 is connected with an external power supply, and the sixth resistor R23 is bridged between the base and the emitter of the triode Q5;
and the fourth power adjustment subunit comprises a triode Q6, a sixth resistor R22, a sixth resistor R26 and a sixth resistor R25, a collector of the triode Q6 is connected with the anode of the second emission tube LED2 through the sixth resistor R22, a base of the triode Q6 is connected with the control module through the sixth resistor R26, an emitter of the triode Q6 is connected with an external power supply, and the sixth resistor R25 is bridged between the base and the emitter of the triode Q6.
In this embodiment, the first power adjustment unit is adapted to adjust the infrared emission power, and the first power adjustment unit is composed of a first power subunit, a first power adjustment subunit, and a second power adjustment subunit, so that different emission powers are output by the cooperative action of the first power subunit, the first power adjustment subunit, and the second power adjustment subunit, and the control module performs 38KHZ frequency modulation on the infrared emission signal through PWM to convert the infrared emission signal into a carrier signal. Similarly, the second power adjustment unit is suitable for adjusting the infrared emission power, and the second power adjustment unit is composed of a second power subunit, a third power adjustment subunit and a fourth power adjustment subunit, so that different emission powers are output through the cooperative action of the second power subunit, the third power adjustment subunit and the fourth power adjustment subunit, and the control module performs 38KHZ frequency modulation on the infrared emission signal through PWM to convert the infrared emission signal into a carrier signal.
In this embodiment, the first power subunit and the second power subunit are both default power units, the default power unit is an initial power unit, and when the transmission power does not need to be adjusted, the first power subunit and/or the second power subunit are selected by default to control the infrared transmission power to be output according to the default power. Because the singlechip of the control module is provided with an IO1 port and an IO2 port, when the IO1 port and the IO2 port output high levels at the same time, the second triode Q2 and the triode Q3 are in a disconnected state, and the triode Q5 and the triode Q6 are also in a disconnected state, so that the first transmitting tube LED1 and the second transmitting tube LED2 can work according to default transmitting power; further, when the IO1 port outputs a low level and the IO2 port simultaneously outputs a high level, the second triode Q2 and the triode Q5 are in a conducting state, the second fifth resistor R19 is connected in parallel with the tenth fifth resistor R14, and the fifth resistor R12 is connected in parallel with the sixth resistor R21, so that the current limiting resistors of the first emitting tube LED1 and the second emitting tube LED2 become small, the emitting current becomes large, and the emitting power is improved; further, when the IO1 port outputs a high level and the IO2 port outputs a low level simultaneously, the triode Q3 and the triode Q6 are in a conducting state, the sixth resistor R20 is connected in parallel with the tenth fifth resistor R14, and the fifth resistor R12 is connected in parallel with the sixth resistor R22, so that the current-limiting resistors of the first emitting tube LED1 and the second emitting tube LED2 become small, the emitting current becomes large, and the emitting power is improved; further, when a larger transmitting power is required, the IO1 port and the IO2 port output a low level at the same time, the second triode Q2 and the triode Q3 are in a conducting state, the triode Q5 and the triode Q6 are also in a conducting state, the second fifth resistor R19 and the sixth resistor R20 are connected in parallel with the tenth fifth resistor R14, and the sixth resistor R22 and the sixth resistor R21 are connected in parallel with the fifth resistor R12, so that the current-limiting resistances of the first transmitting tube LED1 and the second transmitting tube LED2 become smaller, and the transmitting power becomes larger.
Furthermore, the infrared receiver comprises a first infrared receiving module and a second infrared receiving module, wherein the first infrared receiving module is arranged corresponding to the first infrared transmitting module, the second infrared receiving module is arranged corresponding to the second infrared transmitting module, and the first infrared receiving module and the second infrared receiving module are respectively and electrically connected with the control module.
Preferably, the first infrared receiving module and the second infrared receiving module have the same structure, wherein:
the first infrared receiving module comprises a receiving device IR, a fifth resistor R1, a sixth resistor R2, a first capacitor C1 and a seventh resistor R3, wherein the signal output end of the receiving device IR is connected with the control module through the fifth resistor R1, one end of the sixth resistor R2 is connected with the signal output end of the receiving device IR, the other end of the sixth resistor R2 is connected with an external power supply, the negative power supply end of the receiving device IR is grounded, the positive power supply end of the receiving device IR is connected with the external power supply through the seventh resistor R3, one end of the first capacitor C1 is connected with the negative power supply end of the receiving device IR, and the other end of the first capacitor C1 is connected with the fifth resistor R1.
The second infrared receiving module comprises a receiving device IR1, a resistor R6, a resistor R8, a capacitor C3 and a resistor R7, wherein a signal output end of the receiving device IR1 is connected with the control module through the resistor R6, one end of the resistor R8 is connected with a signal output end of the receiving device IR1, the other end of the resistor R8 is connected with an external power supply, a power supply negative end of the receiving device IR1 is grounded, a power supply positive end of the receiving device IR1 is connected with the external power supply through the resistor R7, one end of the capacitor C3 is connected with the power supply negative end of the receiving device IR1, and the other end of the capacitor C3 is connected with the resistor R6.
Particularly, the infrared detection module comprises an eighth resistor R5, an infrared receiving tube RD, a ninth resistor R4 and a second capacitor C2, wherein one end of the eighth resistor R5 is connected with an external power supply, the other end of the eighth resistor R5 is grounded through the infrared receiving tube RD, one end of the ninth resistor R4 is connected with the anode of the infrared receiving tube RD, the other end of the ninth resistor R4 is connected with the control module, one end of the second capacitor C2 is connected with the cathode of the infrared receiving tube RD, and the other end of the second capacitor C2 is connected with the control module.
In this embodiment, the number of the infrared receiving tubes RD is preferably set to two, that is, the infrared receiving tubes RD include a first infrared receiving tube RD and a second infrared receiving tube RD, the first infrared emitting module, the first infrared receiving tube RD and the first infrared receiving module are combined to form a group of sensing units, similarly, the second infrared emitting module, the second infrared receiving tube RD and the second infrared receiving module are combined to form another group of sensing units, then the two groups of sensing units are respectively arranged on the range hood at intervals, and when the hands of the operator pass over the two groups of sensing units successively, the emitted infrared rays are received by the infrared receiving end through diffuse reflection of the hands. Further, when the sensing intensity meets the preset intensity value and the decoding is correct, the sensing is defined as successful, if the hand of the operator waves from left to right, the sensing is successful within a certain time, the hand waves from left to right, otherwise, the hand waves from right to left are determined, namely, the hand waves from right to left are determined if the sensing is not successful within a certain time, and thus, the judging method of the left-right wave motion gesture is formed. Preferably, when the infrared receiving intensity of one pair of sensing units is from weak to strong within a certain time and exceeds a preset intensity value, and if the decoding result is correct, a gesture action of moving from front to back on the position of the sensing unit is determined, otherwise, when the infrared receiving intensity of one pair of sensing units is from strong to weak within a certain time and exceeds a preset intensity value, and if the decoding result is correct, a gesture action of moving from back to front on the position of the sensing unit is determined.
In this embodiment, infrared receiver tube RD receives the infrared signal in the external environment in the infrared detection module, infrared signal intensity is direct proportional relation with the infrared intensity received, through sampling the voltage of infrared receiver tube RD in order to obtain the intensity of infrared ray in the external environment, according to the intensity of infrared ray in the environment, cooperation through first power adjustment unit and second power adjustment unit adjusts infrared emission power, in this embodiment, the voltage of infrared receiver tube RD is less, it indicates that the intensity of infrared ray is stronger in the external environment, namely the infrared emission power of infrared emission module will adjust and uprise, just can guarantee that infrared gesture signal reception signal-to-noise ratio does not descend, thereby automatic adaptation infrared emission power is in order to promote infrared signal-to-noise ratio.
Example two:
as shown in fig. 6, this embodiment provides a control method for automatically adjusting infrared emission power, which is applied to an infrared gesture control circuit according to any one of the embodiments, the infrared intensity is obtained by detecting the intensity of an infrared signal in an external environment, and the infrared emission power is adjusted according to the infrared intensity, so that the first infrared emission module and the second infrared emission module automatically adapt to the infrared emission power, thereby solving the disadvantage that the infrared sensing distance of the infrared gesture range hood is shortened under the illumination of natural light or tricolor light.
Specifically, the control method of the infrared gesture control circuit comprises the following steps:
step S101, after being electrified, infrared signals in an external environment are collected, and the obtained infrared signals are converted into voltage signal values.
Preferably, after the preset time interval, acquiring the infrared signals in the external environment again to obtain a plurality of voltage signal values;
and performing difference calculation on any two voltage signal values in the plurality of voltage signal values to obtain a voltage signal difference.
In this embodiment, after the range hood is powered on, that is, after the infrared gesture control circuit is powered on, the infrared signals in the external environment are collected, the obtained infrared signals are converted into voltage signal values, then, after a preset time period T1 is set at each interval, the voltage V _ RD value of the infrared receiving tube RD is sampled again, a plurality of working voltage values are obtained within a continuous sampling frequency CNT1 preset by a program, and a difference value is calculated between any two working voltage values of the plurality of working voltage values to obtain a voltage signal difference value Δ V _ RD, so that voltage data of the infrared receiving tube RD are obtained.
And step S102, when the voltage signal value meets a preset threshold value, setting the preset threshold value as the current infrared ray intensity value.
Preferably, whether the obtained working voltage value is smaller than a preset voltage value is judged;
if so, setting the preset voltage value as the intensity value of the current infrared ray;
if not, returning to continue the current working voltage value of the infrared detection module.
In this embodiment, it is determined whether the calculated voltage signal difference Δ V _ RD is smaller than a preset threshold Δ V _ RD1, so as to set the preset threshold Δ V _ RD1 as the current infrared intensity value V _ RD1, that is, the infrared intensity is obtained according to the intensity of the infrared signal in the external environment.
And S103, adjusting the infrared emission power of the infrared device according to the current infrared intensity value, and enabling the infrared device to work according to the adjusted infrared emission power.
Preferably, the intensity value of the current infrared ray is compared with a preset intensity value;
if the intensity value of the current infrared ray is greater than the first preset intensity value, the control module adjusts the infrared emission power of the infrared device according to the initial power;
if the intensity value of the current infrared ray is greater than the second preset intensity value and less than or equal to the first preset intensity value, the control module adjusts the infrared emission power of the infrared device according to the first power, and the first power is greater than the initial power;
if the intensity value of the current infrared ray is greater than the third preset intensity value and less than or equal to the second preset intensity value, the control module adjusts the infrared emission power of the infrared device according to the second power, and the second power is greater than the first power;
if the intensity value of the current infrared ray is greater than the fourth preset intensity value and less than or equal to the third preset intensity value, the control module adjusts the infrared emission power of the infrared device according to the third power, and the third power is greater than the first power and the second power.
In this embodiment, after obtaining the infrared intensity according to the intensity of the infrared signal in the external environment, first, it is determined whether the intensity value V _ RD1 of the current infrared meets a first preset condition, where the first preset condition is V _ RD1> V _ RD _ DEF1, where V _ RD1 is the intensity value of the infrared, and V _ RD _ DEF1 is a first preset intensity value, that is, it is determined whether the intensity of the current infrared is greater than the first preset intensity value; if so, enabling the IO1 interface and the IO2 interface of the control module to simultaneously output high level to adjust the infrared emission power of the infrared device, namely outputting the infrared emission power of the infrared device according to the default power; if not, whether the intensity value V _ RD1 of the infrared ray meets a second preset condition is judged.
Then, whether the intensity value V _ RD1 of the current infrared ray meets a second preset condition, where V _ RD1 is the intensity value of the infrared ray, V _ RD _ DEF1 is the first preset intensity value, and V _ RD _ DEF2 is < V _ RD _ DEF1, and V _ RD _ DEF2 is the second preset intensity value, is judged, that is, whether the intensity value V _ RD1 of the current infrared ray is greater than the second preset intensity value and less than or equal to the first preset intensity value is judged; if so, enabling the IO1 interface of the control module to output a low level and the IO2 interface to output a high level at the same time, so as to adjust the infrared emission power of the infrared device from default filtering to a higher infrared emission power, namely adjusting the infrared emission power of the infrared device according to a first power, wherein the first power is greater than the initial power; if not, whether the intensity value V _ RD1 of the infrared ray meets a third preset condition is judged.
Secondly, whether the intensity value V _ RD1 of the current infrared ray meets a third preset condition is judged, the third preset condition is V _ RD1> V _ RD _ DEF3, V _ RD _ DEF3< V _ RD _ DEF2< V _ RD _ DEF1, wherein V _ RD1 is the intensity value of the infrared ray, V _ RD _ DEF1 is a first preset intensity value, V _ RD _ DEF2 is a second preset intensity value, and V _ RD _ DEF3 is a third preset intensity value, namely whether the intensity of the current infrared ray is larger than the third preset intensity value and smaller than or equal to the second preset intensity value is judged; if so, enabling the IO1 interface of the control module to output a high level and the IO2 interface to output a low level simultaneously, so as to adjust the infrared emission power of the infrared device to a higher infrared emission power again, namely adjusting the infrared emission power of the infrared device according to a second power, wherein the second power is greater than the first power; if not, whether the intensity value V _ RD1 of the infrared ray meets a fourth preset condition or not is judged.
Until the intensity value V _ RD1 of the current infrared ray satisfies a fourth preset condition, the fourth preset condition is V _ RD1> V _ RD _ DEF4, and V _ RD _ DEF4< V _ RD _ DEF3< V _ RD _ DEF2< V _ RD _ DEF1, where V _ RD1 is the intensity value of the infrared ray, V _ RD _ DEF1 is the first preset intensity value, V _ RD _ DEF2 is the second preset intensity value, V _ RD _ DEF3 is the third preset intensity value, and V _ RD _ DEF4 is the fourth preset intensity value, so that the IO1 interface and the IO2 interface of the control module output low levels at the same time, thereby adjusting the infrared emission power of the infrared device to a higher infrared emission power again, i.e., adjusting the infrared emission power of the infrared device according to the third power, and the third power is greater than the second power.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (7)
1. A control circuit for automatically adjusting infrared emission power, comprising:
an infrared device adapted to emit infrared rays and receive reflected infrared rays;
the infrared detection module is suitable for acquiring infrared signals in an external environment so as to acquire the intensity of infrared rays in the current environment;
the control module is respectively electrically connected with the infrared detection module and the infrared device, and controls the infrared device to adjust the power of emitting infrared rays according to the intensity of the infrared rays in the current environment.
2. The control circuit of claim 1, wherein the infrared device comprises two sets of infrared transmitters and infrared receivers, wherein the two sets of infrared transmitters and infrared receivers are disposed in a one-to-one correspondence, the infrared transmitters comprise first infrared transmitting modules and second infrared transmitting modules respectively disposed at two opposite positions, the infrared receivers comprise first infrared receiving modules and second infrared receiving modules respectively disposed at two opposite positions, and the first infrared transmitting modules, the second infrared transmitting modules, the first infrared receiving modules, and the second infrared receiving modules are electrically connected to the control module respectively.
3. The control circuit of claim 2, wherein the first infrared emission module and the second infrared emission module have the same structure, wherein the first infrared emission module comprises an emission tube, and a switch unit and a power adjustment unit that are electrically connected to the emission tube and the control module, respectively, the power adjustment unit is configured to adjust the infrared emission power of the emission tube, and the switch unit controls the emission tube to operate according to the adjusted infrared emission power.
4. The control circuit of claim 3, wherein the switching unit comprises a first transistor and a first resistor, wherein a base of the first transistor is connected to the control module through the first resistor, an emitter of the first transistor is grounded, and a collector of the first transistor is connected to a cathode of the emitter.
5. The control circuit for automatically adjusting infrared emission power of claim 3, wherein the power adjustment unit comprises a power sub-unit and two power adjustment sub-units with the same structure, wherein,
the power subunit comprises a tenth resistor, one end of the tenth resistor is connected with the anode of the transmitting tube, and the other end of the tenth resistor is connected with an external power supply;
the power adjusting subunit comprises a second triode, a second resistor, a third resistor and a fourth resistor, wherein a collector of the second triode is connected with the anode of the emission tube through the second resistor, a base of the second triode is connected with the control module through the third resistor, an emitter of the second triode is connected with an external power supply, and the fourth resistor is bridged between the base and the emitter of the second triode.
6. The control circuit of claim 2, wherein the first infrared receiving module and the second infrared receiving module have the same structure, and wherein the first infrared receiving module comprises a receiving device, a fifth resistor, a sixth resistor, a first capacitor and a seventh resistor, wherein a signal output end of the receiving device is connected to the control module through the fifth resistor, one end of the sixth resistor is connected to a signal output end of the receiving device, the other end of the sixth resistor is connected to an external power supply, the first capacitor is connected in parallel to the fifth resistor, a power negative end of the receiving device is grounded, and a power positive end of the receiving device is connected to the external power supply through the seventh resistor.
7. The control circuit according to claim 1, wherein the infrared detection module comprises an eighth resistor, an infrared receiving tube, a ninth resistor and a second capacitor, wherein one end of the eighth resistor is connected to an external power supply, the other end of the eighth resistor is grounded via the infrared receiving tube, one end of the ninth resistor is connected to the anode of the infrared receiving tube, the other end of the ninth resistor is connected to the control module, one end of the second capacitor is connected to the cathode of the infrared receiving tube, and the other end of the second capacitor is connected to the control module.
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