CN114296382A - Photosensitive control circuit and electric appliance - Google Patents
Photosensitive control circuit and electric appliance Download PDFInfo
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- CN114296382A CN114296382A CN202210022886.4A CN202210022886A CN114296382A CN 114296382 A CN114296382 A CN 114296382A CN 202210022886 A CN202210022886 A CN 202210022886A CN 114296382 A CN114296382 A CN 114296382A
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Abstract
The embodiment of the invention provides a photosensitive control circuit and an electric appliance, which comprise a photosensitive detection unit, a first switch unit, a first energy storage unit and a second switch unit; the photosensitive detection unit is used for generating a first signal to the second switch unit according to the intensity of ambient light, and when the first signal is lower than the conduction threshold value of the second switch unit, the second switch unit conducts the connection between the second end of the second switch unit and the third end of the second switch unit, so that the first power supply enables the first energy storage unit to work in a charging state through the second switch unit; then, the first energy storage unit outputs a second signal to the first switch unit, and then the first switch unit switches on the connection between the second end of the first switch unit and the third end of the first switch unit, so that the first power supply is connected with the output end through the first switch unit, and the output end obtains a voltage signal of the first power supply. The circuit adopts a pure hardware circuit to realize photosensitive control, and can reduce the circuit cost and power consumption.
Description
Technical Field
The embodiment of the invention relates to the technical field of hardware circuits, in particular to a photosensitive control circuit and an electric appliance.
Background
In the existing photosensitive sensing scheme, a photosensitive integrated sensor and an integrated sensing chip are generally utilized to carry out circuit design, the integrated sensing chip detects the intensity of ambient light, the photosensitive integrated sensor outputs signals and judges and controls alarm through software setting, the scheme comprises complex algorithm programming, a comparator and a signal amplifier of the integrated chip need to realize photosensitive sensing and judgment control through software programming, in the scheme, the singlechip, the sensing chip and the sensor are often used for controlling and identifying sensing of natural light and outputting signals together, the mode needs software programming control, the design cost is high, and the design requirements of low-cost and low-power-consumption products cannot be met.
Disclosure of Invention
The embodiment of the invention mainly provides a photosensitive control circuit and an electric appliance, which can reduce the cost and the power consumption of the circuit.
In a first aspect, one technical solution adopted in the embodiments of the present invention is: there is provided a photosensitive control circuit comprising: the device comprises a photosensitive detection unit, a first switch unit, a first energy storage unit and a second switch unit; the first end of the photosensitive detection unit is used for being connected with a first power supply, the second end of the photosensitive detection unit is connected with the first end of the second switch unit, and the photosensitive detection unit is used for generating a first signal to the second switch unit according to the intensity of ambient light; the second end of the second switch unit is used for being connected with a first power supply, the third end of the second switch unit is connected with the first end of the first energy storage unit, and the second switch unit is used for conducting connection between the second end of the second switch unit and the third end of the second switch unit according to the first signal so as to enable the first energy storage unit to work in a charging state; the second end of the first energy storage unit is connected with the first end of the first switch unit, and the first energy storage unit is used for outputting a second signal to the first switch unit when working in a charging state; the second end of the first switch unit is used for connecting a first power supply, the third end of the first switch unit is used for connecting an output end, and the first switch unit is used for conducting the connection between the second end of the first switch unit and the third end of the first switch unit when the second signal meets the preset conducting condition of the first switch unit, so that the first power supply is connected with the output end.
In some embodiments, the photosensitive control circuit further comprises a second energy storage unit; the first end of the second energy storage unit is connected with the third end of the first switch unit, and the second end of the second energy storage unit is connected with the first end of the first switch unit.
In some embodiments, the photosensitive control circuit further comprises a key; the first end of the key is used for being connected with the first power supply, and the second end of the key is connected with the first end of the first switch unit.
In some embodiments, the photosensitive control circuit further comprises a first diode; the anode of the first diode is connected with the second end of the second energy storage unit, and the cathode of the first diode is connected with the first end of the first switch unit.
In some embodiments, the photosensitive control circuit further comprises a second diode; the cathode of the second diode is connected with the second end of the second energy storage unit, and the anode of the second diode is grounded.
In some embodiments, the photosensitive detection unit includes a photodiode and a voltage division module; the cathode of the photosensitive diode is used for being connected with the first power supply, the anode of the photosensitive diode is connected with the first end of the voltage division module, the second end of the voltage division module is connected with the first end of the second switch unit, and the third end of the voltage division module is grounded.
In some embodiments, the first switching unit comprises a first switching tube and a second switching tube; the first end of the first switch tube is used for being connected with a first power supply, the second end of the first switch tube is connected with the first end of the second switch tube, the third end of the first switch tube is used for being connected with the output end, the second end of the second switch tube is connected with the second end of the first energy storage unit, and the third end of the second switch tube is grounded.
In some embodiments, the first switching unit further comprises a first resistor and a second resistor; the first resistor is connected between the first end of the first switch tube and the second end of the first switch tube, and the second resistor is connected between the second end of the first switch tube and the first end of the second switch tube.
In some embodiments, the second switching unit includes a third switching tube; the first end of the third switching tube is used for being connected with the first power supply, the second end of the third switching tube is connected with the second end of the photosensitive detection unit, and the third end of the third switching tube is connected with the first end of the first energy storage unit.
In some embodiments, the second switching unit further comprises a third resistor; the third resistor is connected between the third end of the third switching tube and the ground.
In some embodiments, the first energy storage unit comprises a first capacitor and a fourth resistor; the first end of the first capacitor is connected with the third end of the second switch unit, the second end of the first capacitor is respectively connected with the first end of the first switch unit and the first end of the fourth resistor, and the second end of the fourth resistor is grounded.
In some embodiments, the second energy storage unit comprises a second capacitor; and the first end of the second capacitor is connected with the third end of the first switch unit, and the first end of the second capacitor is connected with the first end of the first switch unit.
In some embodiments, the photosensitive control circuit further comprises an input port and an output port; the first end of the input port is respectively connected with the first end of the photosensitive detection unit, the second end of the first switch unit and the second end of the second switch unit, the second end of the input port is grounded, and the input port is used for being connected with the first power supply; the first end of the output port is connected with the third end of the first switch unit, the second end of the output port is grounded, and the output port is used for being connected with the output end.
In some embodiments, the photosensitive control circuit further includes a light emitting unit, a first terminal of the light emitting unit is connected to the third terminal of the first switching unit, and a second terminal of the light emitting unit is grounded.
In a second aspect, an embodiment of the present invention further provides an electrical appliance, including the photosensitive control circuit according to any one of the first aspect.
The beneficial effects of the embodiment of the invention are as follows: different from the prior art, the embodiment of the invention provides a photosensitive control circuit and an electric appliance, which comprise a photosensitive detection unit, a first switch unit, a first energy storage unit and a second switch unit; the photosensitive detection unit is used for generating a first signal to the second switch unit according to the intensity of ambient light, and when the first signal is lower than the conduction threshold value of the second switch unit, the second switch unit conducts the connection between the second end of the second switch unit and the third end of the second switch unit, so that the first power supply enables the first energy storage unit to work in a charging state through the second switch unit; then, the first energy storage unit outputs a second signal to the first switch unit, and then the first switch unit switches on the connection between the second end of the first switch unit and the third end of the first switch unit, so that the first power supply is connected with the output end through the first switch unit, and the output end obtains a voltage signal of the first power supply. The circuit adopts a pure hardware circuit to realize photosensitive control, and can reduce the circuit cost and power consumption.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic structural block diagram of a photosensitive control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a photosensitive control circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
Referring to fig. 1, a photosensitive control circuit 100 according to an embodiment of the present invention includes: photosensitive detection unit 10, first switching unit 20, first energy storage unit 30, second switching unit 40.
The first end of the photosensitive detection unit 10 is used for connecting the first power supply 200, the second end of the photosensitive detection unit 10 is connected with the first end of the second switch unit 40, and the photosensitive detection unit 10 is used for generating a first signal to the second switch unit 40 according to the intensity of ambient light; the second terminal of the second switching unit 40 is configured to be connected to the first power supply 200, the third terminal of the second switching unit 40 is connected to the first terminal of the first energy storage unit 30, and the second switching unit 40 is configured to conduct, according to the first signal, a connection between the second terminal of the second switching unit 40 and the third terminal of the second switching unit 40, so that the first energy storage unit 30 operates in a charging state; the second end of the first energy storage unit 30 is connected to the first end of the first switch unit 20, and the first energy storage unit 30 is configured to output a second signal to the first switch unit 20 when operating in a charging state; the second terminal of the first switch unit 20 is configured to be connected to the first power supply 200, the third terminal of the first switch unit 20 is configured to be connected to the output terminal 300, and the first switch unit 20 is configured to conduct the connection between the second terminal of the first switch unit 20 and the third terminal of the first switch unit 20 when the second signal satisfies a preset conduction condition of the first switch unit 20, so that the first power supply 200 is connected to the output terminal 300.
Specifically, the first power source 200 may be a dc power source or an ac power source, and when the first power source 200 is an ac power source, the first power source may be connected to the photosensitive control circuit through a rectifying unit. In practice, the first power supply and the voltage level thereof can be selected according to the requirements of the photosensitive control circuit, so that a wide voltage input range can be adapted. In the following description, the first power supply is a dc power supply, and is not limited in practical application. The output 300 may be used to connect external circuits, such as loads, etc. The preset turn-on condition of the second switching unit 20 is a magnitude of the second signal that enables the second switching unit 20 to turn on.
When the photosensitive control circuit 100 is connected to the first power supply 200 and the output terminal 300, respectively, the photosensitive detection unit 10 can be used for detecting the intensity of the ambient light and generating a first signal to the second switch unit 40 according to the intensity of the ambient light.
When the first signal is lower than the turn-on threshold of the second switching unit 40, the second switching unit 40 turns on the connection between the second terminal of the second switching unit 40 and the third terminal of the second switching unit 40, so that the first power supply 200 operates the first energy storage unit 30 in a charging state through the second switching unit 40; then, the first energy storage unit 30 outputs a second signal to the first switch unit 20, and then, when the second signal satisfies a preset conduction condition of the first switch unit 20, the first switch unit 20 conducts the connection between the second terminal of the first switch unit 20 and the third terminal of the first switch unit 20, so that the first power supply 200 is connected to the output terminal 300 through the first switch unit 20, and the output terminal 300 obtains a voltage signal of the first power supply 200.
When the first signal is greater than or equal to the turn-on threshold of the second switch unit 40, the second switch unit 40 will disconnect the connection between the second terminal of the second switch unit 40 and the third terminal of the second switch unit 40, so that the first power supply 200 cannot charge the first energy storage unit 30, the first energy storage unit 30 cannot output the second signal to the first switch unit 20, and then the first power supply 200 cannot connect the output terminal 300 through the first switch unit 20.
Therefore, in the photosensitive control circuit, photosensitive control can be realized by adopting a pure hardware circuit, and compared with the photosensitive control by adopting a singlechip and an integrated chip, the photosensitive control circuit can reduce the detection cost, the design cost and the power consumption, and can meet the design requirements of low-cost products and low-power-consumption products.
In some embodiments, referring to fig. 2, the photosensitive detection unit 10 includes a photodiode D4 and a voltage dividing module 11; the cathode of the photodiode D4 is connected to the first power source, the anode of the photodiode D4 is connected to the first terminal of the voltage dividing module 11, the second terminal of the voltage dividing module 11 is connected to the first terminal of the second switch unit 40, and the third terminal of the voltage dividing module 11 is grounded.
Among them, the photodiode D4 is a semiconductor device capable of converting an optical signal into an electrical signal, and operates under the reverse voltage. When no light is applied, the reverse current of the photodiode D4 is small, generally lower than 0.1uA, which is also called dark current, and when light is applied, the reverse current of the photodiode D4 is large, which is also called photocurrent. Then, for the photosensitive detection unit 10, when the ambient light is strong, for example, when there is a light in the daytime or at night, the photodiode D4 receives a large intensity of light and presents a low-resistance state, and the current of the photodiode D4 is large, then the first power supply outputs a voltage signal higher than the conduction threshold of the second switch unit 40 to the second switch unit 40 through the voltage division module 11, so as to turn off the second switch unit 40. When there is no light or the ambient light is weak, the light intensity received by the photodiode D4 is small, and is in a high-impedance state, and the current of the photodiode D4 is small, then the first power supply outputs a voltage signal lower than the conduction threshold of the second switch unit 40 to the second switch unit 40 through the voltage dividing module 11, or the voltage dividing module 11 directly grounds the first end of the second switch unit 40, so that the second switch unit 40 is turned on.
In some embodiments, with reference to fig. 2, the voltage dividing module 11 includes a first voltage dividing resistor Rf1 and a second voltage dividing resistor Rf2, wherein a first terminal of the first voltage dividing resistor Rf1 is connected to an anode of the photodiode D4, a second terminal of the first voltage dividing resistor Rf1 is connected to a first terminal of the first switch unit 20 and a first terminal of the second voltage dividing resistor Rf2, and a second terminal of the second voltage dividing resistor Rf2 is grounded. In this way, by setting the resistance values of the first dividing resistor Rf1 and the second dividing resistor Rf2 according to the on threshold of the second switch unit 40, the first dividing resistor Rf1 and the second dividing resistor Rf2 can divide the voltage of the first power source according to the current magnitude of the photodiode D4, and output a suitable voltage signal to the second switch unit 40 when the second switch unit 40 needs to be turned on or off. In practical applications, the number and the resistance of the voltage dividing resistors in the voltage dividing module 11 may be set according to actual needs, and are not limited herein.
In some embodiments, the first switch unit comprises a first switch tube and a second switch tube; the first end of the first switch tube is used for being connected with a first power supply, the second end of the first switch tube is connected with the first end of the second switch tube, the third end of the first switch tube is used for being connected with an output end, the second end of the second switch tube is connected with the second end of the first energy storage unit, and the third end of the second switch tube is grounded.
Specifically, referring to fig. 2, the first switch tube includes a PMOS tube Q1, the second switch tube includes an NPN transistor Q2, a drain of the PMOS tube Q1 is configured to be connected to the first power supply, a source of the PMOS tube Q1 is configured to be connected to the output terminal, a gate of the PMOS tube Q1 is connected to a collector of the NPN transistor Q2, a base of the NPN transistor Q2 is connected to the second end of the first energy storage unit 30, and an emitter of the NPN transistor Q2 is grounded. In the first switch unit 20, when the first energy storage unit 30 is charged, since the voltages at the two ends of the first energy storage unit 30 cannot suddenly change, the voltage at the second end of the first energy storage unit 30 cannot be instantly reduced to be below the conduction threshold of the NPN transistor Q2, that is, during the charging process of the first energy storage unit 30, the second end of the first energy storage unit 30 generates a voltage higher than the conduction threshold of the NPN transistor Q2, for example, higher than 0.7V, at this time, the NPN transistor Q2 is turned on, the gate of the PMOS transistor Q1 is grounded, the PMOS transistor Q1 is also turned on, and the first power supply can be connected to the output terminal through the PMOS transistor Q1. In practical applications, the number of the switching tubes, the types of the switching tubes, and the conduction thresholds of the switching tubes included in the first switching unit 20 can be set according to actual needs, and the limitations in this embodiment are not limited herein.
In order to improve the stability of the circuit operation, in some embodiments, referring to fig. 2, the first switch unit further includes a first resistor R1; the first resistor R1 is connected between the first terminal of the first switch tube and the second terminal of the first switch tube. Specifically, referring to fig. 2, the first resistor R1 is connected between the drain of the PMOS transistor Q1 and the gate of the PMOS transistor Q1, so that when the voltage of the gate of the PMOS transistor Q1 is unstable, the first power source can pull up the gate voltage of the PMOS transistor Q1 through the first resistor R1, and thus, the PMOS transistor Q1 is disconnected, thereby ensuring that the PMOS transistor Q1 is reliably turned off, and improving the stability of the circuit operation.
In order to improve the safety of the circuit operation, in some embodiments, referring to fig. 2, the first switch unit 20 further includes a second resistor R2; the second resistor R2 is connected between the second terminal of the first switch tube and the first terminal of the second switch tube. Specifically, referring to fig. 2, the second resistor R2 is connected between the gate of the PMOS transistor Q1 and the collector of the NPN transistor Q2, so that when the first power supply suddenly changes, the second resistor R2 can perform an isolation function and limit the current flowing through the collector of the NPN transistor Q2, thereby protecting the NPN transistor Q2 from being damaged by the sudden change voltage and improving the safety and reliability of the circuit operation.
In some of these embodiments, the second switching unit includes a third switching tube; the first end of the third switching tube is used for being connected with a first power supply, the second end of the third switching tube is connected with the second end of the photosensitive detection unit, and the third end of the third switching tube is connected with the first end of the first energy storage unit.
Specifically, referring to fig. 2, the third switching tube includes a PNP transistor Q3, an emitter of the PNP transistor Q3 is used for connecting the first power supply, a base of the PNP transistor Q3 is connected to the second end of the first voltage-dividing resistor Rf1, and a collector of the PNP transistor Q3 is connected to the first end of the first energy storage unit 30. Thus, when the photosensitive detection unit 10 outputs a voltage signal higher than 0.7V, the PNP transistor Q3 is turned on, and the first power supply charges the first energy storage unit 30 through the PNP transistor Q3; when the photosensitive detection unit 10 outputs a voltage signal lower than 0.7V, the PNP transistor Q3 is turned off, and the first power supply cannot charge the first energy storage unit 30. In practical applications, the number, type and conduction threshold of the switching tubes of the second switching unit 40 can be set according to actual needs, and the limitation in this embodiment is not required here.
In some of these embodiments, the second switching unit 40 further comprises a third resistor R3; the third resistor R3 is connected between the third terminal of the third switching tube and ground. Specifically, referring to fig. 2, the third resistor R3 is disposed between the collector of the PNP transistor Q3 and ground, and the third resistor R3 is disposed to limit the current flowing through the PNP transistor Q3, thereby protecting the PNP transistor Q3 and improving the safety and reliability of the circuit operation. Usually, the third resistor R3 has a large resistance value, for example, a 2M resistor can be selected, and when the PNP transistor Q3 is turned on, the isolation function can be performed, and the circuit is not shorted, thereby improving the circuit safety.
In some embodiments, referring to fig. 2, the first energy storage unit 30 includes a first capacitor C1 and a fourth resistor R4; a first terminal of the first capacitor C1 is connected to the third terminal of the second switch unit 40, a second terminal of the first capacitor C1 is connected to the first terminal of the first switch unit 20 and the first terminal of the fourth resistor R4, and a second terminal of the fourth resistor R4 is grounded.
Specifically, a first end of the first capacitor C1 is connected to the collector of the PNP transistor Q3 and the third resistor R3, respectively, and a second end of the second capacitor C2 is connected to the base of the NPN transistor Q2 and the first end of the fourth resistor R4, respectively. Generally, the resistance of the fourth resistor R4 is large, so that when the PNP transistor Q3 is turned on, the third resistor R3 divides the voltage of the first power source, and the first power source charges the first capacitor C1 through the PNP transistor Q3, because the first capacitor C1 has the function of isolating the dc power source, the second end of the first capacitor C1 charges when the first capacitor C1 charges, and when the resistance of the fourth resistor R4 is large, the voltage of the second end of the first capacitor C1 cannot be instantaneously reduced to below 0.7V, so that a voltage higher than 0.7V is generated at the second end of the first capacitor C1. Thus, the second terminal of the first capacitor C1 outputs a voltage higher than 0.7V to the base of the NPN transistor Q2, and the NPN transistor Q2 is turned on, thereby turning on the PMOS transistor Q1. Generally, the first capacitor C1 may be a thin film capacitor having a positive terminal and a negative terminal.
It can be understood that, because the strong and weak influence of light, photosensitive detecting element 10's detected signal can change, leads to photosensitive control circuit's operating condition to change, if do not have light trigger circuit at night and switch on the back, photosensitive detecting element if when suddenly by the highlight illumination, the circuit will be triggered and turn off, then when the highlight elimination, the circuit is triggered again and switches on, under this condition, the circuit is in unstable conducting state, has reduced user's experience and has felt. In order to improve the user experience, in some embodiments, please refer to fig. 2, the photosensitive control circuit further includes a second energy storage unit 50; a first end of the second energy storage unit 50 is connected to the third end of the first switching unit 20, and a second end of the second energy storage unit 50 is connected to the first end of the first switching unit 20.
Like this, after first switch unit 20 switches on, first power accessible first switch unit 20 charges for second energy storage unit 50, like this, when second switch unit 40 is in unstable conducting state, first energy storage unit 30 has the unable situation of charging, the energy of saving on second energy storage unit 50 this moment will release, and output a voltage signal to the third terminal of first switch unit 20, thereby let first switch unit 20 continue to maintain the conducting state, thereby can the conducting state of stabilizing circuit, and the operating time of extension back stage circuit, improve user's experience and feel.
In some embodiments, with continued reference to fig. 2, the second energy storage unit 50 includes a second capacitor C2; a first terminal of the second capacitor C2 is connected to the third terminal of the first switch unit 20, and a second terminal of the second capacitor C2 is connected to the first terminal of the first switch unit 20. Specifically, referring to fig. 2, a first end of a second capacitor C2 is connected to a source of a PMOS transistor Q1, a second end of a second capacitor C2 is connected to a base of an NPN transistor Q2, a second end of the first capacitor C1, and a first end of a fourth resistor R4, respectively, when the PMOS transistor Q1 is turned on, the first power source charges the second capacitor C2, and when the first capacitor C1 cannot output a voltage signal to turn on the NPN transistor Q2, that is, after the PMOS transistor Q1 is turned off, the second capacitor C2 discharges, so that the second capacitor C2 outputs a voltage signal higher than that of the NPN transistor Q2 to the base of the NPN transistor Q2, and the NPN transistor Q2 is turned on continuously, so that the PMOS transistor Q1 is turned on continuously, thereby stabilizing the on state of the circuit, and further prolonging the on time of the PMOS transistor Q1.
In some embodiments, referring to fig. 2, the photosensitive control circuit further includes a first diode D1; an anode of the first diode D1 is connected to the second terminal of the second energy storage unit 50, and a cathode of the first diode D1 is connected to the first terminal of the first switching unit 20. Specifically, the anode of the first diode D1 is connected to the second end of the second capacitor C2, and the cathode of the first diode D1 is connected to the second end of the first capacitor C1, the base of the NPN triode Q2, and the first end of the fourth resistor R4, respectively, so that the voltages of the first capacitor C1 and the second capacitor C2 are prevented from being connected in series by the unidirectional conduction function of the first diode D1, and finally the voltages of the first capacitor C1 and the second capacitor C2 are discharged through the fourth resistor R4, thereby ensuring the stability and safety of the circuit operation.
In some embodiments, referring to fig. 2, the photosensitive control circuit further includes a second diode D2; the cathode of the second diode D2 is connected to the second terminal of the second energy storage unit 50, and the anode of the second diode D2 is grounded. Specifically, the cathode of the second diode D2 is connected to the second end of the second capacitor C2 and the anode of the first diode D1, respectively, and the anode of the second diode D2 is grounded. Since the voltage of the ground is a small floating voltage, generally the voltage of the ground is lower than 0.7V, during the discharging of the second capacitor C2, there may be a case that the second terminal voltage of the second capacitor C2 is lower than the voltage of the ground, at this time, the second diode D2 is turned on, the second terminal of the second capacitor C2 is stably grounded, and the voltage of the second capacitor C2 is discharged to the ground voltage, thereby ensuring the safety of the circuit.
In order to ensure the safety of the circuit operation during the process of discharging the second capacitor C2 by the second diode D2, in some embodiments, please refer to fig. 2 again, the photosensitive control circuit further includes a fifth resistor R5, the fifth resistor R5 is connected between the anode of the second diode D2 and the ground, and by providing the fifth resistor R5, the current magnitude of the second capacitor C2 when discharging through the second diode D2 can be limited, so as to ensure the safety of the circuit.
To enhance the user experience, in some embodiments, referring to fig. 2, the photosensitive control circuit further includes a key SW 1; the first terminal of the button SW1 is connected to the first power source, and the second terminal of the button SW1 is connected to the first terminal of the first switch unit 20. Specifically, the second terminal of the key SW1 is connected to the base of the NPN transistor Q2, wherein the key SW1 is a physical key SW1, and when pressed, the connection between the first terminal of the key SW1 and the second terminal of the key SW1 is turned on. Therefore, when emergency power supply is needed, the key SW1 can be pressed, when the key SW1 is pressed, the first power supply is connected with the base electrode of the NPN triode Q2 through the key SW1, the base electrode of the NPN triode Q2 reaches a high level, the NPN triode Q2 is conducted, the PMOS tube Q1 is conducted, the first power supply can supply power to a rear electrode circuit, the effect of emergency power supply is achieved, and user experience is improved.
In some embodiments, the photosensitive control circuit further includes an input port U1, a first end of the input port U1 is connected to the first end of the photosensitive detection unit 10, the second end of the first switch unit 20, and the second end of the second switch unit 40, respectively, and a second end of the input port U1 is grounded; the input port U1 is for connection to a first power source.
In some embodiments, the photosensitive control circuit further includes an output U2, a first terminal of the output U2 is connected to the third terminal of the first switch unit 20, a second terminal of the output U2 is grounded, and the output U2 is used for connecting to an output terminal.
In some embodiments, the photosensitive control circuit further includes a light emitting unit 60, a first terminal of the light emitting unit 60 is connected to the third terminal of the first switch unit 20, and a second terminal of the light emitting unit 60 is grounded. Specifically, the light emitting unit 60 includes a light emitting diode D3, an anode of the light emitting diode D3 is connected to a source of the PMOS transistor Q1, and a cathode of the light emitting diode D3 is grounded, so that when the first switching unit 20 is triggered and turned on, the first power source can form a loop through the PMOS transistor Q1, the light emitting diode D3 and the ground, and the light emitting diode D3 is powered and emits light.
In order to limit the current flowing through the led D3, in some embodiments, the light emitting unit 60 further includes a sixth resistor R6, and the sixth resistor R6 is connected between the source of the PMOS transistor Q1 and the anode of the led D3, so that when the PMOS transistor Q1 is triggered to conduct, the sixth resistor R6 can limit the current flowing through the led D3 from the first power source, thereby protecting the led D3 and improving the safety and reliability of the circuit operation.
In some embodiments, a high level signal may be further output from the anode of the led D3 to other circuit modules, for example, the anode of the led D3 may be further connected to the control unit, so that after the PMOS transistor is turned on, the photosensitive control circuit may output a high level signal to the control unit through the anode of the led D3, and the control unit operates according to the high level signal. In practical application, the third end of the first switch unit can be connected with the voltage division module, the voltage division module is connected with other circuit modules, and after the first switch unit is conducted again, the voltage division module outputs a proper signal to other circuit modules to meet other functional requirements.
The following describes the specific operation process of the photosensitive control circuit provided by the embodiment of the present invention in detail with reference to the embodiment shown in fig. 2.
When the input port U1 is connected to the first power supply, the photodiode D4 starts to operate, when ambient light is strong, for example, in the daytime or at night, the photodiode D4 receives a large intensity of light and presents a low-resistance state, and the current of the photodiode D4 is large, then, the first power supply divides the voltage through the photodiode D4, the first voltage-dividing resistor Rf1 and the second voltage-dividing resistor Rf2, the second end of the first voltage-dividing resistor Rf1 outputs a voltage signal higher than 0.7V to the base of the PNP triode Q3, the PNP triode Q3 is stably disconnected, and the rear-stage circuit does not operate.
When no light is irradiated or the ambient light is weak, the light intensity received by the photodiode D4 is small, and the photodiode D4 is in a high-impedance state, and the current of the photodiode D4 is small, then, the first power supply divides the voltage through the photodiode D4, the first voltage dividing resistor Rf1 and the second voltage dividing resistor Rf2, the second end of the first voltage dividing resistor Rf1 outputs a voltage signal lower than 0.7V to the base of the PNP triode Q3, the PNP triode Q3 is conducted, or the base of the PNP triode Q3 is grounded through the second voltage dividing resistor Rf2, and the PNP triode Q3 is conducted.
Then, when the PNP transistor Q3 is turned on, on one hand, the first power supply divides voltage through the PNP transistor Q3 and the third resistor R3, and on the other hand, the first power supply also forms a loop through the PNP transistor Q3, the first capacitor C1, the fourth resistor R4, and the ground, so that the first power supply charges the first capacitor C1, since the voltage across the first capacitor C1 cannot suddenly change, the voltage across the second capacitor C1 cannot be instantaneously reduced to below 0.7V at the second end, therefore, a voltage higher than 0.7V is generated at the second end of the first capacitor C1, after the base of the NPN transistor Q2 receives the voltage signal, the NPN transistor Q2 is turned on, the gate of the PMOS transistor Q1 is grounded through the second resistor R2 and the NPN transistor Q2, and the PMOS transistor Q1 is turned on.
When the PMOS transistor Q1 is turned on, first, when the output port U2 is connected to the output port, the first power supply outputs a voltage signal to the output port through the PMOS transistor Q1, for example, the first power supply can supply power to the output port.
Next, when the light emitting unit 60 is provided, the first power source forms a loop through the PMOS transistor Q1, the sixth resistor R6, the light emitting diode D3, and the ground, and the light emitting diode D3 emits light. In addition, if the anode of the light emitting diode D3 is connected to another circuit module, a voltage signal may be output to the other circuit module through the anode of the light emitting diode D3, and in practical applications, another voltage dividing module 11 may be further configured to output a suitable voltage signal to the other circuit module, which is not limited herein.
Finally, the first power supply also charges the second capacitor C2 through the PMOS transistor Q1, and when the temperature detection unit is unstable in operation and the conduction state of the PNP triode Q3 is unstable, that is, the conduction state of the NPN triode Q2 is unstable, the electric energy stored in the second capacitor C2 can provide a stable voltage for the NPN triode Q2, so that the NPN triode Q2 is stably conducted, the PMOS transistor Q1 is stably conducted, and the stability of the circuit operation and the duration of the circuit operation are ensured.
Therefore, the photosensitive control circuit can respond to the illumination intensity of natural light, realizes the function of controlling the circuit switch through the illumination intensity, owing to adopt pure hardware circuit can realize photosensitive control, compare in adopting singlechip cooperation integrated chip to carry out photosensitive control, and this embodiment can reduce detection cost, design cost and consumption, can satisfy the design demand of low-cost product and low-power consumption product.
In a second aspect, an embodiment of the present invention further provides an electrical appliance, where the electrical appliance includes the photosensitive control circuit according to any one of the first aspect. In particular, the electrical appliance may be a light-operated lamp, a light-operated switch, a light-operated display, or any other suitable light-operated device. The electrical appliance adopts a pure hardware circuit to realize photosensitive control, and reduces the circuit cost and the power consumption.
The embodiment of the invention provides a photosensitive control circuit and an electric appliance, which comprise a photosensitive detection unit, a first switch unit, a first energy storage unit and a second switch unit; the photosensitive detection unit is used for generating a first signal to the second switch unit according to the intensity of ambient light, and when the first signal is lower than the conduction threshold value of the second switch unit, the second switch unit conducts the connection between the second end of the second switch unit and the third end of the second switch unit, so that the first power supply enables the first energy storage unit to work in a charging state through the second switch unit; then, the first energy storage unit outputs a second signal to the first switch unit, and then the first switch unit switches on the connection between the second end of the first switch unit and the third end of the first switch unit, so that the first power supply is connected with the output end through the first switch unit, and the output end obtains a voltage signal of the first power supply. The circuit adopts a pure hardware circuit to realize photosensitive control, and can reduce the circuit cost and power consumption.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (15)
1. A photosensitive control circuit, comprising: the device comprises a photosensitive detection unit, a first switch unit, a first energy storage unit and a second switch unit;
the first end of the photosensitive detection unit is used for being connected with a first power supply, the second end of the photosensitive detection unit is connected with the first end of the second switch unit, and the photosensitive detection unit is used for generating a first signal to the second switch unit according to the intensity of ambient light;
the second end of the second switch unit is used for being connected with a first power supply, the third end of the second switch unit is connected with the first end of the first energy storage unit, and the second switch unit is used for conducting connection between the second end of the second switch unit and the third end of the second switch unit according to the first signal so as to enable the first energy storage unit to work in a charging state;
the second end of the first energy storage unit is connected with the first end of the first switch unit, and the first energy storage unit is used for outputting a second signal to the first switch unit when working in a charging state;
the second end of the first switch unit is used for connecting a first power supply, the third end of the first switch unit is used for connecting an output end, and the first switch unit is used for conducting the connection between the second end of the first switch unit and the third end of the first switch unit when the second signal meets the preset conducting condition of the first switch unit, so that the first power supply is connected with the output end.
2. The photosensitive control circuit according to claim 1, further comprising a second energy storage unit;
the first end of the second energy storage unit is connected with the third end of the first switch unit, and the second end of the second energy storage unit is connected with the first end of the first switch unit.
3. The photosensitive control circuit of claim 2, wherein the photosensitive control circuit further comprises a key;
the first end of the key is used for being connected with the first power supply, and the second end of the key is connected with the first end of the first switch unit.
4. The photosensitive control circuit of claim 3, further comprising a first diode;
the anode of the first diode is connected with the second end of the second energy storage unit, and the cathode of the first diode is connected with the first end of the first switch unit.
5. The photosensitive control circuit of claim 4, further comprising a second diode;
the cathode of the second diode is connected with the second end of the second energy storage unit, and the anode of the second diode is grounded.
6. The photosensitive control circuit according to any one of claims 1 to 5, wherein the photosensitive detection unit comprises a photodiode and a voltage division module;
the cathode of the photosensitive diode is used for being connected with the first power supply, the anode of the photosensitive diode is connected with the first end of the voltage division module, the second end of the voltage division module is connected with the first end of the second switch unit, and the third end of the voltage division module is grounded.
7. The photosensitive control circuit according to any one of claims 1 to 5, wherein the first switching unit comprises a first switching tube and a second switching tube;
the first end of the first switch tube is used for being connected with a first power supply, the second end of the first switch tube is connected with the first end of the second switch tube, the third end of the first switch tube is used for being connected with the output end, the second end of the second switch tube is connected with the second end of the first energy storage unit, and the third end of the second switch tube is grounded.
8. The photosensitive control circuit according to claim 7, wherein the first switching unit further comprises a first resistor and a second resistor;
the first resistor is connected between the first end of the first switch tube and the second end of the first switch tube, and the second resistor is connected between the second end of the first switch tube and the first end of the second switch tube.
9. The photosensitive control circuit according to any one of claims 1 to 5, wherein the second switching unit comprises a third switching tube;
the first end of the third switching tube is used for being connected with the first power supply, the second end of the third switching tube is connected with the second end of the photosensitive detection unit, and the third end of the third switching tube is connected with the first end of the first energy storage unit.
10. The photosensitive control circuit of claim 9, wherein the second switch unit further comprises a third resistor;
the third resistor is connected between the third end of the third switching tube and the ground.
11. The photosensitive control circuit according to any one of claims 1 to 5, wherein the first energy storage unit comprises a first capacitor and a fourth resistor;
the first end of the first capacitor is connected with the third end of the second switch unit, the second end of the first capacitor is respectively connected with the first end of the first switch unit and the first end of the fourth resistor, and the second end of the fourth resistor is grounded.
12. The photosensitive control circuit according to any one of claims 2 to 5, wherein the second energy storage unit comprises a second capacitor;
and the first end of the second capacitor is connected with the third end of the first switch unit, and the first end of the second capacitor is connected with the first end of the first switch unit.
13. A photosensitive control circuit according to any one of claims 1 to 5, further comprising an input port and an output port;
the first end of the input port is respectively connected with the first end of the photosensitive detection unit, the second end of the first switch unit and the second end of the second switch unit, the second end of the input port is grounded, and the input port is used for being connected with the first power supply;
the first end of the output port is connected with the third end of the first switch unit, the second end of the output port is grounded, and the output port is used for being connected with the output end.
14. The photosensitive control circuit according to any one of claims 1 to 5, further comprising a light emitting unit, wherein a first terminal of the light emitting unit is connected to the third terminal of the first switching unit, and a second terminal of the light emitting unit is grounded.
15. An electrical appliance comprising a light sensitive control circuit as claimed in any one of claims 1 to 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210022886.4A CN114296382A (en) | 2022-01-10 | 2022-01-10 | Photosensitive control circuit and electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210022886.4A CN114296382A (en) | 2022-01-10 | 2022-01-10 | Photosensitive control circuit and electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114296382A true CN114296382A (en) | 2022-04-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210022886.4A Pending CN114296382A (en) | 2022-01-10 | 2022-01-10 | Photosensitive control circuit and electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114296382A (en) |
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2022
- 2022-01-10 CN CN202210022886.4A patent/CN114296382A/en active Pending
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