Light control circuit

Abstract

The invention discloses a light control circuit comprising a brightness acquisition module which is used for acquiring environment brightness according to a photosensitive unit configured by the brightness acquisition module and outputting an environment brightness value; the control signal output module is used for comparing the environment brightness signal value input by the brightness acquisition module with a brightness threshold value input by a user, and outputting a corresponding control signal to control a light-emitting device according to a comparison result; and the threshold acquisition module is used for acquiring a signal value input by the user through a configured signal input unit and outputting the acquired signal value as the brightness threshold. A user can quickly input or adjust the brightness threshold value in real time through the threshold value acquisition module so as to correspondingly control the light-emitting device, and the energy consumption management and the display effect can be balanced.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic products, and in particular to a lighting control circuit. Background Art

[0002] Various products used in daily life and commercial scenarios usually require lighting for illumination or product display.

[0003] To achieve intelligent control of lighting, existing lighting control systems can be linked with product status. For example, when the product recognizes that the user is around the product, or when the user opens the product door, the light is turned on; when the user leaves or the door is closed, the product light is turned on. This control method only turns on the light when the product is in use. Although it can save energy, it is not ideal for product display. For example, for the refrigerator in a convenience store, when the user is not close to the refrigerator, the light cabinet will not turn on, and the product cannot be actively displayed. The user cannot view the products in the refrigerator, and the display effect is not ideal. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a lighting control circuit that can save energy consumption while taking into account the lighting display effect.

[0005] An embodiment of the present invention provides a lighting control circuit, the circuit comprising:

[0006] A brightness acquisition module, the brightness acquisition module is used to collect the ambient brightness according to the photosensitive unit configured therein and output the ambient brightness value;

[0007] A control signal output module, the control signal output module is used to compare the ambient brightness signal value input by the brightness acquisition module with the brightness threshold input by the user, and output a corresponding control signal to control the light-emitting device according to the comparison result;

[0008] A threshold acquisition module is used to acquire the signal value input by the user through the signal input unit configured by the module, and output the acquired signal value as the brightness threshold.

[0009] As a preferred solution, the signal input unit includes a variable resistance potentiometer;

[0010] The first conventional pin of the variable resistance potentiometer is used as the input end of the threshold acquisition module and is used to connect to the power supply;

[0011] The second conventional pin of the variable resistance potentiometer is grounded;

[0012] The middle pin of the variable resistance potentiometer serves as the output end of the threshold acquisition module and is connected to the control signal output module.

[0013] As an improvement of the above solution, the threshold acquisition module further includes a first impedance unit, a second impedance unit, a third impedance unit, a first capacitor unit and a second capacitor unit;

[0014] The first regular pin of the variable resistance potentiometer is connected to the power supply through the first impedance unit;

[0015] The first regular pin of the variable resistance potentiometer is also connected to the first end of the second impedance unit, and the second end of the second impedance unit serves as the reference value output end of the threshold value acquisition module and is connected to the control signal output module;

[0016] The middle pin of the variable resistance potentiometer is used as the output end of the threshold acquisition module, specifically:

[0017] The middle pin of the variable resistance potentiometer is connected to the first end of the third impedance unit, and the second end of the third impedance unit serves as the output end of the threshold acquisition module;

[0018] The output end of the threshold acquisition module is also grounded through the first capacitor unit;

[0019] The reference value output end of the threshold acquisition module is also grounded through the second capacitor unit;

[0020] The resistance value of the second impedance unit is the same as the resistance value of the third impedance unit, and the capacitance value of the first capacitor unit is the same as the capacitance value of the second capacitor unit.

[0021] Preferably, the photosensitive unit comprises a photoresistor;

[0022] The brightness acquisition module also includes a fourth impedance unit;

[0023] The first end of the photoresistor is used to connect to the power supply, and the second end of the photoresistor is grounded through the fourth impedance unit;

[0024] The second end of the photoresistor serves as the output end of the brightness collection module.

[0025] Furthermore, the brightness acquisition module also includes a fifth impedance unit and a third capacitor unit;

[0026] The second end of the photoresistor is used as the output end of the brightness acquisition module, specifically:

[0027] The second end of the photoresistor is connected to the first end of the fifth impedance unit, and the second end of the fifth impedance unit serves as the output end of the brightness collection module;

[0028] The output end of the brightness collection module is also grounded through a third capacitor unit.

[0029] As a preferred solution, the circuit further includes a lighting driving module;

[0030] The driving module is turned on / off under the control of the control signal, and outputs a high / low level driving signal to the light emitting device corresponding to the power supply input to its input terminal.

[0031] Further, the light driving module includes a first switch unit, a second switch unit, a fifth impedance unit, a sixth impedance unit, a seventh impedance unit, an eighth impedance unit and a ninth impedance unit;

[0032] The input end of the first switch unit is used as the input end of the light driving module and is used to connect to a power supply;

[0033] The output end of the first switch unit is grounded through the fifth impedance unit, and the output end of the first switch unit serves as the output end of the light driving module, for outputting a driving voltage;

[0034] The input end of the first switch unit is connected to the control end of the first switch unit through the sixth impedance unit, and the control end of the first switch unit is connected to the input end of the second switch unit through the seventh impedance unit; the output end of the second switch unit is grounded, and the control end of the second switch unit is connected to the output end of the second switch unit through the eighth impedance unit; the control end of the second switch unit is also connected to the first end of the ninth impedance unit, and the second end of the ninth impedance unit serves as the control end of the light driving module and is connected to the control signal output module.

[0035] As an improvement of the above solution, the light driving module further includes a first diode, a second diode and a fourth capacitor unit;

[0036] The anode of the first diode is connected to the output end of the first switch unit, and the cathode of the first diode is used to connect to the power supply;

[0037] The cathode of the second diode is connected to the output end of the first switch unit, and the anode of the second diode is grounded;

[0038] The output end of the first switch unit is also grounded through the fourth capacitor unit.

[0039] Preferably, the control signal output module includes a controller;

[0040] The controller is configured to:

[0041] Receiving the ambient brightness signal value and the brightness threshold;

[0042] Calculate an environment ratio value obtained by dividing the environment brightness signal value by the maximum environment brightness signal value pre-measured by the brightness acquisition module;

[0043] Calculate a threshold ratio value obtained by dividing the brightness threshold by a reference signal value at a reference value output end of the threshold acquisition module;

[0044] When the environment ratio value is not less than the threshold ratio value and the duration is not less than the preset duration, a high level control signal is output;

[0045] When the environment ratio value is less than the threshold ratio value and the duration is not less than the preset duration, a low level control signal is output.

[0046] As a preferred solution, the control signal output module includes a comparator;

[0047] The positive input terminal of the comparator is used as the first input terminal of the control signal output module and is connected to the output terminal of the brightness acquisition module;

[0048] The negative input terminal of the comparator is used as the second input terminal of the control signal output module and is connected to the output terminal of the threshold acquisition module;

[0049] The output end of the comparator serves as the output end of the control signal output module, and is used to output the control signal.

[0050] Compared with the prior art, the present invention discloses a lighting control circuit, including a brightness acquisition module, the brightness acquisition module is used to collect the ambient brightness according to the photosensitive unit configured therein, and output the ambient brightness value; a control signal output module, the control signal output module is used to compare the ambient brightness signal value input by the brightness acquisition module and the brightness threshold input by the user, and output the corresponding control signal to control the light-emitting device according to the comparison result; a threshold acquisition module, the threshold acquisition module is used to collect the signal value input by the user through the signal input unit configured therein, and output the collected signal value as the brightness threshold. The user can quickly input or adjust the brightness threshold in real time through the threshold acquisition module, and then control the light-emitting device accordingly, which can balance the energy consumption management and the display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is a structural schematic diagram of a lighting control circuit provided by an embodiment of the present invention;

[0052] Figure 2 is a circuit schematic diagram of a threshold acquisition module provided in an embodiment of the present invention;

[0053] Figure 3is a circuit schematic diagram of a threshold acquisition module provided by another embodiment of the present invention;

[0054] Figure 4 is a circuit schematic diagram of a brightness acquisition module provided in an embodiment of the present invention;

[0055] Figure 5 is a circuit schematic diagram of a brightness acquisition module provided by another embodiment of the present invention;

[0056] Figure 6 is a structural schematic diagram of a lighting control circuit provided by another embodiment of the present invention;

[0057] Figure 7 is a circuit schematic diagram of a light driving module provided by an embodiment of the present invention;

[0058] Figure 8 is a schematic diagram of the structure of a control signal output module provided in an embodiment of the present invention;

[0059] Fig. 9 is a flowchart of specific execution steps of the controller provided in an embodiment of the present invention;

[0060] Fig.10 It is a structural diagram of a control signal output module provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0063] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0064] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] See also Figure 1 , is a schematic diagram of the structure of a lighting control circuit provided by an embodiment of the present invention, the circuit comprising:

[0066] A brightness acquisition module, the brightness acquisition module is used to collect the ambient brightness according to the photosensitive unit configured therein and output the ambient brightness value;

[0067] A control signal output module, the control signal output module is used to compare the ambient brightness signal value input by the brightness acquisition module with the brightness threshold input by the user, and output a corresponding control signal to control the light-emitting device according to the comparison result;

[0068] A threshold acquisition module is used to acquire the signal value input by the user through the signal input unit configured by the module, and output the acquired signal value as the brightness threshold.

[0069] When this embodiment is implemented, the lighting control circuit can be applied to household appliances or commercial products and equipment; for example, display lights for household wine cabinets and refrigerators used in convenience stores. In the scenarios of household wine cabinets and commercial refrigerators, the wine cabinets and refrigerators not only need to have corresponding storage functions to store corresponding items, but also need to have certain display functions. The household wine cabinet needs to be equipped with corresponding lamps to realize the lighting of the wine cabinet and the display of the wine, and play a corresponding decorative role. For the refrigerators used in corresponding convenience stores, when the store is open, it is necessary to keep the lights in the refrigerators sufficient to ensure that users can intuitively see the goods on sale. The lighting control method of this product, which adopts the method of manual control by the user to open or close, is obviously unscientific. Not only is the process of opening or closing each time very cumbersome, but the user is likely to miss it, resulting in the lamps being in a normally open or normally closed state for a long time, which is easy to cause energy waste and poor lighting display effect. Conventional intelligent lighting control methods may configure corresponding sensors on the cabinet doors. When the user opens the cabinet door or approaches the cabinet, the light is turned on after the user is recognized. Although this method can intelligently control the light and save energy, the light cannot be turned on when the user is not close to the cabinet, and the display effect of the cabinet cannot be balanced. Especially in commercial scenarios such as convenience stores, poor display effects will seriously affect the sales of goods in the refrigerator.

[0070] In view of the above defects, the lighting control circuit proposed in this application includes a brightness acquisition module, a control signal output module and a threshold acquisition module;

[0071] The brightness acquisition module is configured with a photosensitive unit, which is used to convert the external environment brightness into a corresponding light signal value in the circuit. The brightness acquisition module is used to read the light signal value converted by the photosensitive unit and convert it into an environment brightness value for output.

[0072] It should be noted that the ambient brightness value output may specifically be a physical quantity output such as a corresponding current value or voltage value, and its output value has a certain correlation with the ambient brightness and can be recognized by the control signal output module.

[0073] It should be noted that the photosensitive unit can be specifically a circuit characteristic that has a certain correlation with the intensity of the ambient light irradiated thereon, thereby converting the characteristics of the ambient light intensity into a physical quantity in the circuit, which is then recognized by the control signal output module. The photosensitive unit specifically includes: a photoresistor, a light sensor or a photovoltaic device.

[0074] The threshold acquisition module is equipped with a signal input unit, which is used to collect the signal value input by the user. The user can manually adjust the circuit characteristics of the signal input unit to correspond to the input signal value into the circuit. The threshold acquisition unit is used to collect the signal value manually input by the user and represent it as the corresponding brightness threshold output.

[0075] It should be noted that the working principle of the signal input unit is specifically a device that can manually adjust the circuit characteristics, and its adjustment follows a certain correlation. For example, the user changes the position of the middle node by sliding the rheostat to determine the sliding resistance, and the threshold acquisition module identifies the sliding resistance to determine the brightness threshold.

[0076] The output end of the brightness acquisition module and the output end of the threshold acquisition module are both connected to the input end of the control signal output module.

[0077] The control signal output module obtains the ambient brightness signal value input by the brightness acquisition module and the brightness threshold value input by the user through the threshold acquisition module, compares the ambient brightness signal value with the brightness threshold value, and outputs a corresponding control signal to control the light-emitting device according to the comparison result.

[0078] That is, the control signal output module controls the light-emitting device by comparing the ambient brightness signal value with the brightness threshold. By setting the brightness threshold, when the store is open, the ambient brightness value collected by the light sensor is higher than the brightness threshold set by the user, and the lights inside the display cabinet are on. When the store is not open, when the ambient brightness value collected by the light sensor is lower than the brightness threshold set by the user, the lights inside the display cabinet are off.

[0079] Through the threshold acquisition module, users can quickly input or adjust the brightness threshold in real time, and then control the light-emitting devices accordingly, which can balance energy consumption management and display effects.

[0080] In another embodiment provided by the present invention, the signal input unit includes a variable resistance potentiometer;

[0081] The first conventional pin of the variable resistance potentiometer is used as the input end of the threshold acquisition module and is used to connect to the power supply;

[0082] The second conventional pin of the variable resistance potentiometer is grounded;

[0083] The middle pin of the variable resistance potentiometer serves as the output end of the threshold acquisition module and is connected to the control signal output module.

[0084] When this embodiment is implemented, see Figure 2 , is a circuit schematic diagram of a threshold acquisition module provided in an embodiment of the present invention;

[0085] The threshold acquisition module specifically includes a signal input unit, and the signal input unit specifically is a variable resistance potentiometer P;

[0086] The first regular pin J1 of the variable resistance potentiometer P serves as the input terminal IN1 of the threshold value acquisition module. The input terminal IN1 of the threshold value acquisition module is used to connect to the first power supply VCC1.

[0087] A second common pin J2 of the variable resistance potentiometer P is grounded.

[0088] The middle pin J3 of the variable resistance potentiometer P serves as the output terminal OUT1 of the threshold value acquisition module, and the output terminal OUT1 of the threshold value acquisition module is connected to the control signal output module.

[0089] The voltage value input by the first power supply is grounded through the variable resistance potentiometer P, and is determined by the current I of the variable resistance potentiometer P, the voltage value V1 of the first power supply VCC1, and the resistance R between the first normal pin J1 and the second normal pin J2 of the variable resistance potentiometer P, that is, I=V1 / R.

[0090] The user adjusts the position of the middle pin to change the resistance between the middle pin J3 and the second normal pin J2 of the variable resistance potentiometer P, thereby changing the voltage division value at the middle pin.

[0091] The control signal output module detects the voltage on the middle pin J3 of the variable resistance potentiometer P, thereby being able to read the brightness threshold value input by the user by adjusting the position of the middle pin.

[0092] It should be noted that the position of the middle pin of the variable resistance potentiometer can be controlled by a sliding condition, or it can be made into a knob structure, and the position of the middle pin can be adjusted by rotating the knob, thereby adjusting the brightness threshold.

[0093] Through the variable resistance potentiometer, users can quickly and easily adjust the brightness threshold, thereby achieving lighting control.

[0094] In another embodiment provided by the present invention, the threshold acquisition module further includes a first impedance unit, a second impedance unit, a third impedance unit, a first capacitor unit and a second capacitor unit;

[0095] The first regular pin of the variable resistance potentiometer is connected to the power supply through the first impedance unit;

[0096] The first regular pin of the variable resistance potentiometer is also connected to the first end of the second impedance unit, and the second end of the second impedance unit serves as the reference value output end of the threshold value acquisition module and is connected to the control signal output module;

[0097] The middle pin of the variable resistance potentiometer is used as the output end of the threshold acquisition module, specifically:

[0098] The middle pin of the variable resistance potentiometer is connected to the first end of the third impedance unit, and the second end of the third impedance unit serves as the output end of the threshold acquisition module;

[0099] The output end of the threshold acquisition module is also grounded through the first capacitor unit;

[0100] The reference value output end of the threshold acquisition module is also grounded through the second capacitor unit;

[0101] The resistance value of the second impedance unit is the same as the resistance value of the third impedance unit, and the capacitance value of the first capacitor unit is the same as the capacitance value of the second capacitor unit.

[0102] When this embodiment is implemented, see Figure 3 , is a circuit schematic diagram of a threshold acquisition module provided in another embodiment of the present invention.

[0103] The threshold acquisition module specifically includes a first impedance unit R1, a second impedance unit R2, a third impedance unit R3, a first capacitor unit C1 and a second capacitor unit C2.

[0104] The first regular pin J1 of the variable resistance potentiometer P is connected to the first end of the first impedance unit R1, and the second end of the first impedance unit R1 is used as the input end IN1 of the threshold acquisition module and is connected to the first power supply VCC1;

[0105] It should be noted that in Figure 3 In the embodiment, the first impedance unit is specifically a resistor device. In other embodiments, the first impedance unit is composed of a resistor module composed of at least one resistor device connected in series and in parallel.

[0106] The first regular pin J1 of the variable resistance potentiometer P is also connected to the first end of the second impedance unit R2, and the second end of the second impedance unit R2 serves as the reference value output end OUT2 of the threshold value acquisition module and is connected to the control signal output module;

[0107] It should be noted that in Figure 3 In the embodiment, the second impedance unit is specifically a resistor device. In other embodiments, the second impedance unit is composed of a resistor module composed of at least one resistor device connected in series and in parallel.

[0108] The middle pin J3 of the variable resistance potentiometer P is connected to the first end of the third impedance unit R3, and the second end of the third impedance unit R3 serves as the output end OUT1 of the threshold acquisition module, connected to the control signal output module, and is used to output a voltage signal value corresponding to the brightness threshold.

[0109] It should be noted that in Figure 3 In the embodiment, the third impedance unit is specifically a resistor device. In other embodiments, the third impedance unit is composed of a resistor module composed of at least one resistor device connected in series and in parallel.

[0110] The output terminal OUT1 of the threshold acquisition module is also grounded through the first capacitor unit C1;

[0111] It should be noted that in Figure 3 In the embodiment, the first capacitor unit is specifically a capacitor device. In other embodiments, the first capacitor unit is composed of a capacitor module composed of at least one capacitor device connected in series and in parallel.

[0112] The reference value output terminal OUT2 of the threshold value acquisition module is also grounded through the second capacitor unit C2.

[0113] It should be noted that in Figure 3 In the embodiment, the second capacitor unit is specifically a capacitor device. In other embodiments, the second capacitor unit is composed of a capacitor module composed of at least one capacitor device connected in series and in parallel.

[0114] The output signal of the output end of the threshold acquisition module is current-limited by the first impedance unit to avoid excessive current flowing through the variable resistance potentiometer at the intermediate node, thereby preventing the variable resistance potentiometer from being damaged and improving circuit safety.

[0115] The output signal at the output end of the threshold acquisition module is current limited by the third impedance unit to avoid the power supply being directly added to the output end of the threshold acquisition module when the middle pin is at the position of the first conventional pin J1, resulting in excessive current and damage to the control signal output module, thereby improving circuit stability.

[0116] The first capacitor unit is used to filter the output end of the threshold acquisition module, so as to maintain the stability of the output current of the output end of the threshold acquisition module, avoid damaging the control signal output module, and improve the circuit stability.

[0117] The second capacitor unit is used to filter the reference value output end of the threshold acquisition module to maintain the stability of the output current of the reference value output end of the threshold acquisition module, avoid damaging the control signal output module, and improve circuit stability.

[0118] By making the parameters of the second impedance unit correspond to those of the third impedance unit, the resistance value of the second impedance unit is the same as the resistance value of the third impedance unit; by making the parameters of the first capacitor unit correspond to those of the second capacitor unit, the capacitance value of the first capacitor unit is the same as the capacitance value of the second capacitor unit, so that the reference value output end of the threshold acquisition module and the output end of the threshold acquisition module are in the same current limiting and filtering circuit, so that the voltage signal value outputted from the reference value output end of the threshold acquisition module is the maximum value outputted from the output end of the threshold acquisition module, thereby serving as a reference value for setting the brightness threshold, facilitating percentage calculation and accurate setting of the brightness threshold.

[0119] In another embodiment provided by the present invention, the photosensitive unit includes a photoresistor;

[0120] The brightness acquisition module also includes a fourth impedance unit;

[0121] The first end of the photoresistor is used to connect to the power supply, and the second end of the photoresistor is grounded through the fourth impedance unit;

[0122] The second end of the photoresistor serves as the output end of the brightness collection module.

[0123] When this embodiment is implemented, see Figure 4 , is a circuit schematic diagram of a brightness acquisition module provided in an embodiment of the present invention.

[0124] The photosensitive unit includes a photoresistor Rp, and the brightness collection module also includes a fourth impedance unit R4.

[0125] The first end of the photoresistor Rp is used as the input end IN3 of the brightness collection module for connecting to the second power supply VCC2, and the second end of the photoresistor Rp is grounded through the fourth impedance unit R4.

[0126] It should be noted that in Figure 4 In the embodiment, the fourth capacitor unit is specifically a capacitor device. In other embodiments, the fourth capacitor unit is composed of a capacitor module composed of at least one capacitor device connected in series and in parallel.

[0127] The second end of the photoresistor Rp serves as the output end OUT3 of the brightness acquisition module.

[0128] During specific operation, the second power supply VCC2 is grounded through the photoresistor Rp and the fourth impedance unit R4. When the intensity of external light changes, the resistance value of the photoresistor Rp changes, thereby changing the current flowing through the fourth impedance unit R4, thereby changing the voltage on the fourth impedance unit R4.

[0129] The photoresistor converts the external light intensity value into the resistance physical quantity change value of the circuit. By detecting the voltage value of the intermediate node between the photoresistor Rp and the fourth impedance unit R4 and detecting the voltage division value on the fourth impedance unit R4, the external light intensity is collected.

[0130] In another embodiment provided by the present invention, the brightness acquisition module further includes a fifth impedance unit and a third capacitor unit;

[0131] The second end of the photoresistor is used as the output end of the brightness acquisition module, specifically:

[0132] The second end of the photoresistor is connected to the first end of the fifth impedance unit, and the second end of the fifth impedance unit serves as the output end of the brightness collection module;

[0133] The output end of the brightness collection module is also grounded through a third capacitor unit.

[0134] When this embodiment is implemented, see Figure 5 , is a circuit schematic diagram of a brightness acquisition module provided in another embodiment of the present invention.

[0135] The photosensitive unit includes a photoresistor Rp, and the brightness collection module also includes a fourth impedance unit R4, a fifth impedance unit R5 and a third capacitor unit C3.

[0136] The first end of the photoresistor Rp is used as the input end IN3 of the brightness collection module for connecting to the second power supply VCC2, and the second end of the photoresistor Rp is grounded through the fourth impedance unit R4.

[0137] It should be noted that in Figure 4 In the embodiment, the fourth capacitor unit is specifically a capacitor device. In other embodiments, the fourth capacitor unit is composed of a capacitor module composed of at least one capacitor device connected in series and in parallel.

[0138] The second end of the photoresistor Rp is connected to the first end of the fifth impedance unit R5, and the second end of the fifth impedance unit R5 serves as the output end OUT3 of the brightness acquisition module, which is used to connect to the control signal output module.

[0139] It should be noted that in Figure 5 In the embodiment, the fourth capacitor unit and the fifth capacitor unit are both capacitor devices. In other embodiments, the fourth capacitor unit and the fifth capacitor unit are composed of a capacitor module composed of at least one capacitor device connected in series and in parallel.

[0140] During specific operation, the second power supply VCC2 is grounded through the photoresistor Rp and the fourth impedance unit R4. When the intensity of external light changes, the resistance value of the photoresistor Rp changes, thereby changing the current flowing through the fourth impedance unit R4, thereby changing the voltage on the fourth impedance unit R4.

[0141] The photoresistor converts the external light intensity value into the resistance physical quantity change value of the circuit. By detecting the voltage value of the intermediate node between the photoresistor Rp and the fourth impedance unit R4 and detecting the voltage division value on the fourth impedance unit R4, the external light intensity is collected.

[0142] The fifth impedance unit is connected to the output end of the brightness collection module to limit the current, so as to avoid excessive current at the output end of the brightness collection module when the voltage of the power supply is applied to the output end of the brightness collection module when the resistance of the photoresistor Rp is too low.

[0143] Through the filtering effect of the third capacitor unit, current fluctuations caused by unstable power supply or changes in the resistance value of the photoresistor are avoided, thereby improving circuit stability.

[0144] In another embodiment provided by the present invention, the circuit further includes a light driving module;

[0145] The driving module is turned on / off under the control of the control signal, and outputs a high / low level driving signal to the light emitting device corresponding to the power supply input to its input terminal.

[0146] When this embodiment is implemented, see Figure 6 , is a structural diagram of a lighting control circuit provided by another embodiment of the present invention.

[0147] The light control circuit also includes a light driving module, the input end of the light driving module is used to connect to the third power supply, the output end of the light driving module is used to connect to the first end of the light emitting device lamp, and the second end of the light emitting device lamp is grounded. The control end of the light emitting device lamp is connected to the output end of the control signal output module, and is used to receive the control signal output by the control signal output module.

[0148] The control signal controls the on or off of the light driving module. When the light driving module is on, the light driving module converts the power supply inputted at its input end into a corresponding high-level driving voltage to supply power to the light-emitting device lamp, thereby driving the light-emitting device lamp to emit light. When the light driving module is off, the light driving module cannot output the corresponding driving voltage to supply power to the light-emitting device lamp, and the light-emitting device lamp does not emit light.

[0149] It should be noted that the light driving module includes a device with a switch function, which can be controlled by the control signal output by the control signal output module to output a corresponding driving signal.

[0150] The light driving module can output a corresponding driving signal according to the control signal to drive the light emitting device to emit light.

[0151] In another embodiment of the present invention, the light driving module includes a first switch unit, a second switch unit, a fifth impedance unit, a sixth impedance unit, a seventh impedance unit, an eighth impedance unit and a ninth impedance unit;

[0152] The input end of the first switch unit is used as the input end of the light driving module and is used to connect to a power supply;

[0153] The output end of the first switch unit is grounded through the fifth impedance unit, and the output end of the first switch unit serves as the output end of the light driving module, for outputting a driving voltage;

[0154] The input end of the first switch unit is connected to the control end of the first switch unit through the sixth impedance unit, and the control end of the first switch unit is connected to the input end of the second switch unit through the seventh impedance unit; the output end of the second switch unit is grounded, and the control end of the second switch unit is connected to the output end of the second switch unit through the eighth impedance unit; the control end of the second switch unit is also connected to the first end of the ninth impedance unit, and the second end of the ninth impedance unit serves as the control end of the light driving module and is connected to the control signal output module.

[0155] When this embodiment is implemented, see Figure 7 , is a circuit schematic diagram of a light driving module provided in an embodiment of the present invention.

[0156] The light driving module includes a first switch unit Q1, a second switch unit Q2, a fifth impedance unit R5, a sixth impedance unit R6, a seventh impedance unit R7, an eighth impedance unit R8 and a ninth impedance unit R9;

[0157] The input end of the first switch unit Q1 is used as the input end IN4 of the light driving module, and is used to connect to the fourth power supply VCC4;

[0158] The output end of the first switch unit Q1 is grounded through the fifth impedance unit R5, and the output end of the first switch unit Q1 serves as the output end OUT4 of the light driving module, which is used to output a driving voltage to drive the light-emitting device lamp, that is, the output end OUT4 of the light driving module is connected to the input end of the light-emitting device lamp, and the output end of the light-emitting device lamp is grounded.

[0159] It should be noted that, in the embodiment provided Figure 7 In the embodiment, the first switch unit is specifically a PNP type transistor, the emitter of the PNP type transistor serves as the input end of the first switch unit, the collector of the PNP type transistor serves as the output end of the first switch unit, and the base of the PNP type transistor serves as the control end of the first switch unit. In other embodiments, the first switch unit is specifically a device with switching characteristics, such as other types of transistors and field effect transistors.

[0160] The input end of the first switch unit Q1 is connected to the control end of the first switch unit Q1 through the sixth impedance unit R6, and the control end of the first switch unit Q1 is connected to the input end of the second switch unit Q2 through the seventh impedance unit R7; the output end of the second switch unit Q2 is grounded, and the control end of the second switch unit Q2 is connected to the output end of the second switch unit Q2 through the eighth impedance unit R8; the control end of the second switch unit Q2 is also connected to the first end of the ninth impedance unit R9, and the second end of the ninth impedance unit R9 serves as the control end CON of the light driving module, and is connected to the output end of the control signal output module.

[0161] It should be noted that, in the embodiment provided Figure 7 In the embodiment, the fifth impedance unit R5, the sixth impedance unit R6, the eighth impedance unit R8 and the ninth impedance unit R9 are all specifically a resistor device. In other embodiments, the fifth impedance unit R5, the sixth impedance unit R6, the eighth impedance unit R8 and the ninth impedance unit R9 are composed of a resistor module composed of at least one resistor device connected in series and parallel.

[0162] It should be noted that, in the embodiment provided Figure 7 In the embodiment, the seventh impedance unit R7 is specifically composed of two resistor devices connected in parallel. In other embodiments, the seventh impedance unit R7 is composed of a resistor module composed of at least one resistor device connected in series and in parallel.

[0163] It should be noted that, in the embodiment provided Figure 7 In the embodiment, the second switch unit Q2 is specifically an NPN transistor, the collector of the PNP transistor serves as the input end of the second switch unit, the emitter of the NPN transistor serves as the output end of the second switch unit, and the base of the NPN transistor serves as the control end of the second switch unit. In other embodiments, the second switch unit is specifically a device with switching characteristics, such as other types of transistors and field effect transistors.

[0164] The second switch unit is turned on or off by the control signal output from the control end. When a high-level control signal is input to the control end, the second switch unit is turned on. At this time, the voltage drop between the input end and the control end of the first switch unit meets the conduction condition. At this time, the first switch unit is also turned on. At this time, the voltage of the fourth power supply is transmitted to the output end of the light driving module through the first switch unit to drive the light-emitting device to emit light. When a low-level control signal is input to the control end, the second switch unit is turned off. At this time, the voltage between the input end and the control end of the first switch unit is the same and does not meet the conduction condition. At this time, the second switch unit is also turned off. At this time, the voltage of the fourth power supply cannot be transmitted to the output end of the light driving module through the first switch unit, and the light-emitting device does not emit light.

[0165] It should be noted that in this embodiment, two switch units are cascaded to perform switch control and drive voltage output. In other embodiments, a single switch unit can be used to perform switch control and drive voltage output. When a single switch unit is set, the potentials of the drive voltage and the control signal need to be specially set to meet the corresponding conduction conditions. Compared with a single switch unit, this solution uses two switch units to isolate the drive voltage of the power supply required by the light-emitting device from the potential of the control signal. In this way, the voltage setting of the fourth power supply and the potential of the control signal at the control end do not affect each other. Both do not need to meet the conduction conditions of a single switch device. Through the voltage division effect of the sixth impedance unit and the seventh impedance unit, the fourth power supply voltage can be divided to a suitable voltage strength to meet the conduction condition of the second switch unit when the control signal is at a high potential, and the fourth power supply voltage just meets the drive voltage of the light-emitting device. This setting method is simpler and safer.

[0166] In another embodiment provided by the present invention, the light driving module further includes a first diode, a second diode and a fourth capacitor unit;

[0167] The anode of the first diode is connected to the output end of the first switch unit, and the cathode of the first diode is used to connect to the power supply;

[0168] The cathode of the second diode is connected to the output end of the first switch unit, and the anode of the second diode is grounded;

[0169] The output end of the first switch unit is also grounded through the fourth capacitor unit.

[0170] When this embodiment is implemented, see Figure 7 , the light driving module also includes a first diode D1, a second diode D2 and a fourth capacitor unit C4;

[0171] An anode of the first diode D1 is connected to the output end of the first switch unit Q1, and a cathode of the first diode D1 is used to connect to a fourth power supply VCC4;

[0172] The cathode of the second diode D2 is connected to the output end of the first switch unit Q1, and the anode of the second diode D2 is grounded;

[0173] The connection method of the first diode D1 and the second diode D2 constitutes a BAV99 device. The BAV99 device is connected to the output end of the light driving module to prevent the output end from being interfered by electrostatic discharge or the discharge from damaging the circuit, for fear that the signal received by the output end has large static electricity.

[0174] When KV-level static electricity is input from the input terminal, the second diode D2 is reversely broken down, and the charge is quickly discharged to the ground or power supply. Positive static electricity is discharged to the power supply through the first diode D1, and negative static electricity is mostly discharged to the ground through the second diode D2.

[0175] In addition, the BAV99 device can also limit the voltage amplitude at the output end to avoid excessive limiting. It protects the lighting driver module. Since the rear stage is the output end, if the rear stage terminal is mistakenly inserted into a power supply device from the outside, it plays a protective role.

[0176] If it is placed in the interface circuit part, it is to suppress the conducted interference. After the common-mode interference of the interface circuit is coupled in, a bidirectional high voltage will be generated on the signal line. When BAV99 is used, the voltage amplitude will be clamped at the interface. However, with external interference, a large noise will be generated on the power supply used for positive voltage clamping. Similarly, negative voltage clamping will also generate a large noise on the ground. Therefore, the use of BAV99 and the fourth capacitor unit that acts as a filter in this application can improve the circuit safety.

[0177] In yet another embodiment provided by the present invention, the control signal output module includes a controller;

[0178] The controller is configured to:

[0179] Receiving the ambient brightness signal value and the brightness threshold;

[0180] Calculate an environment ratio value obtained by dividing the environment brightness signal value by the maximum environment brightness signal value pre-measured by the brightness acquisition module;

[0181] Calculate a threshold ratio value obtained by dividing the brightness threshold by a reference signal value at a reference value output end of the threshold acquisition module;

[0182] When the environment ratio value is not less than the threshold ratio value and the duration is not less than the preset duration, a high level control signal is output;

[0183] When the environment ratio value is less than the threshold ratio value and the duration is not less than the preset duration, a low level control signal is output.

[0184] When this embodiment is implemented, see Figure 8 , is a schematic diagram of the structure of a control signal output module provided in an embodiment of the present invention.

[0185] The control signal output module specifically includes a controller.

[0186] The controller includes three input terminals, namely, a first input terminal I1, a second input terminal I2 and a third input terminal I3, and the controller includes an output terminal O. The first input terminal I1 is connected to the output terminal OUT1 of the threshold acquisition module, the second input terminal I2 is connected to the reference value output terminal OUT2 of the threshold acquisition module, the third input terminal I3 is connected to the output terminal OUT3 of the brightness acquisition module, and the output terminal O of the controller is used as the output terminal of the control signal output module to output the control signal.

[0187] The controller receives the ambient brightness signal value collected by the brightness collection module and the brightness threshold and reference signal value collected by the threshold collection module.

[0188] See also Fig. 9 , is a flowchart of specific execution steps of the controller provided in an embodiment of the present invention. The control specifically executes the following steps:

[0189] Step S901, obtaining an ambient brightness signal value L and a brightness threshold T;

[0190] Step S902, calculate the environmental ratio value δ L , that is, the ambient brightness signal value L and the maximum ambient brightness signal value L max Divide to get the environmental ratio value δ L , δ L =L / L max .

[0191] Among them, the maximum ambient brightness signal value L max It is the signal value output by the output end of the brightness acquisition module under the strongest brightness provided by the laboratory, that is, it represents the brightness value that the brightness acquisition module can collect.

[0192] Step S903, calculating the threshold ratio value δ T , that is, divide the brightness threshold T by the reference signal value T0 to obtain the threshold ratio value δ T , δ T =T / T0.

[0193] The reference signal value T0 is the signal value of the reference value output terminal of the threshold value acquisition module, indicating the maximum reference value that can be acquired by the threshold value acquisition module when the brightness threshold set by the user is the maximum value.

[0194] Step S904, determine δ L ≥δ T Whether it is established. That is, whether the environment ratio value is not less than the threshold ratio value.

[0195] If yes, execute step S905;

[0196] If not, execute step S907;

[0197] Step S905, determine δ L ≥δ T Whether the duration is not less than 2 minutes;

[0198] If yes, execute step S906;

[0199] If not, return to step S901;

[0200] Step S906, outputting a high level control signal.

[0201] Step S907, determine δ L <δ T Whether the duration is not less than 2 minutes;

[0202] If yes, execute step S908;

[0203] If not, return to step S901;

[0204] Step S908: output a low level control signal.

[0205] It should be noted that in this embodiment, the threshold ratio value and the brightness ratio value are normalized by using the reference value obtained by the circuit parameters to normalize the collected ambient brightness and the brightness threshold value to ensure the accuracy of the determination process. In addition, when the brightness threshold and the ambient brightness meet certain conditions, the duration is monitored to avoid frequent starting and stopping of the light due to the influence of other light sources, thereby ensuring the stability of the control process.

[0206] In yet another embodiment provided by the present invention, the control signal output module includes a comparator;

[0207] The positive input terminal of the comparator is used as the first input terminal of the control signal output module and is connected to the output terminal of the brightness acquisition module;

[0208] The negative input terminal of the comparator is used as the second input terminal of the control signal output module and is connected to the output terminal of the threshold acquisition module;

[0209] The output end of the comparator serves as the output end of the control signal output module, and is used to output the control signal.

[0210] When this embodiment is implemented, see Fig.10 , is a structural diagram of a control signal output module provided by another embodiment of the present invention.

[0211] The control signal output module specifically includes a comparator U.

[0212] The comparator U has two input terminals, namely a positive input terminal V1 and a negative input terminal V2 , and the comparator U includes an output terminal V3 .

[0213] The positive input terminal V1 of the comparator U is used as the first input terminal of the control signal output module and is connected to the output terminal OUT3 of the brightness acquisition module;

[0214] The negative input terminal V2 of the comparator U serves as the second input terminal of the control signal output module and is connected to the output terminal OUT1 of the threshold acquisition module;

[0215] The output terminal V3 of the comparator U serves as the output terminal of the control signal output module, and is used to output the control signal.

[0216] The input signal of the negative input terminal V2 of the comparator is used as the reference signal. When the value of the ambient brightness signal input at the positive input terminal V1 is greater than the brightness threshold input at the negative input terminal V2, the output terminal V3 outputs a high-level control signal. When the value of the ambient brightness signal input at the positive input terminal V1 is not greater than the brightness threshold input at the negative input terminal V2, the output terminal V3 outputs a low-level control signal.

[0217] Using a comparator as a control signal output module can simplify circuit design. Without the involvement of chips or microcontrollers, intelligent control of lighting can be achieved only through hardware circuits, which can save costs.

[0218] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A lighting control circuit, characterized in that: The circuit comprises: A brightness acquisition module, the brightness acquisition module is used to collect the ambient brightness according to the photosensitive unit configured therein and output the ambient brightness value; A control signal output module, the control signal output module is used to compare the ambient brightness signal value input by the brightness acquisition module with the brightness threshold input by the user, and output a corresponding control signal to control the light-emitting device according to the comparison result; A threshold acquisition module is used to acquire the signal value input by the user through the signal input unit configured by the module, and output the acquired signal value as the brightness threshold.

2. The lighting control circuit according to claim 1, characterized in that: The signal input unit includes a variable resistance potentiometer; The first conventional pin of the variable resistance potentiometer is used as the input end of the threshold acquisition module and is used to connect to the power supply; The second conventional pin of the variable resistance potentiometer is grounded; The middle pin of the variable resistance potentiometer serves as the output end of the threshold acquisition module and is connected to the control signal output module.

3. The lighting control circuit according to claim 2, characterized in that: The threshold acquisition module further includes a first impedance unit, a second impedance unit, a third impedance unit, a first capacitor unit and a second capacitor unit; The first regular pin of the variable resistance potentiometer is connected to the power supply through the first impedance unit; The first regular pin of the variable resistance potentiometer is also connected to the first end of the second impedance unit, and the second end of the second impedance unit serves as the reference value output end of the threshold value acquisition module and is connected to the control signal output module; The middle pin of the variable resistance potentiometer is used as the output end of the threshold acquisition module, specifically: The middle pin of the variable resistance potentiometer is connected to the first end of the third impedance unit, and the second end of the third impedance unit serves as the output end of the threshold acquisition module; The output end of the threshold acquisition module is also grounded through the first capacitor unit; The reference value output end of the threshold acquisition module is also grounded through the second capacitor unit; The resistance value of the second impedance unit is the same as the resistance value of the third impedance unit, and the capacitance value of the first capacitor unit is the same as the capacitance value of the second capacitor unit.

4. The lighting control circuit according to claim 1, characterized in that: The photosensitive unit includes a photoresistor; The brightness acquisition module also includes a fourth impedance unit; The first end of the photoresistor is used to connect to the power supply, and the second end of the photoresistor is grounded through the fourth impedance unit; The second end of the photoresistor serves as the output end of the brightness collection module.

5. The lighting control circuit as claimed in claim 4, characterized in that: The brightness acquisition module also includes a fifth impedance unit and a third capacitor unit; The second end of the photoresistor is used as the output end of the brightness acquisition module, specifically: The second end of the photoresistor is connected to the first end of the fifth impedance unit, and the second end of the fifth impedance unit serves as the output end of the brightness collection module; The output end of the brightness collection module is also grounded through a third capacitor unit.

6. The lighting control circuit according to claim 1, characterized in that: The circuit also includes a lighting driving module; The driving module is turned on / off under the control of the control signal, and outputs a high / low level driving signal to the light emitting device corresponding to the power supply input to its input terminal.

7. The lighting control circuit according to claim 6, characterized in that: The light driving module includes a first switch unit, a second switch unit, a fifth impedance unit, a sixth impedance unit, a seventh impedance unit, an eighth impedance unit and a ninth impedance unit; The input end of the first switch unit is used as the input end of the light driving module and is used to connect to a power supply; The output end of the first switch unit is grounded through the fifth impedance unit, and the output end of the first switch unit serves as the output end of the light driving module, for outputting a driving voltage; The input end of the first switch unit is connected to the control end of the first switch unit through the sixth impedance unit, and the control end of the first switch unit is connected to the input end of the second switch unit through the seventh impedance unit; the output end of the second switch unit is grounded, and the control end of the second switch unit is connected to the output end of the second switch unit through the eighth impedance unit; the control end of the second switch unit is also connected to the first end of the ninth impedance unit, and the second end of the ninth impedance unit serves as the control end of the light driving module and is connected to the control signal output module.

8. The lighting control circuit as claimed in claim 7, characterized in that: The light driving module also includes a first diode, a second diode and a fourth capacitor unit; The anode of the first diode is connected to the output end of the first switch unit, and the cathode of the first diode is used to connect to the power supply; The cathode of the second diode is connected to the output end of the first switch unit, and the anode of the second diode is grounded; The output end of the first switch unit is also grounded through the fourth capacitor unit.

9. The lighting control circuit according to claim 1, characterized in that: The control signal output module includes a controller; The controller is configured to: Receiving the ambient brightness signal value and the brightness threshold; Calculate an environment ratio value obtained by dividing the environment brightness signal value by the maximum environment brightness signal value pre-measured by the brightness acquisition module; Calculate a threshold ratio value obtained by dividing the brightness threshold by a reference signal value at a reference value output end of the threshold acquisition module; When the environment ratio value is not less than the threshold ratio value and the duration is not less than the preset duration, a high level control signal is output; When the environment ratio value is less than the threshold ratio value and the duration is not less than the preset duration, a low level control signal is output.

10. The lighting control circuit according to claim 1, characterized in that: The control signal output module includes a comparator; The positive input terminal of the comparator is used as the first input terminal of the control signal output module and is connected to the output terminal of the brightness acquisition module; The negative input terminal of the comparator is used as the second input terminal of the control signal output module and is connected to the output terminal of the threshold acquisition module; The output end of the comparator serves as the output end of the control signal output module, and is used to output the control signal.

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