Dimming circuit of self-adaptive silkworm breeding system

Abstract

The utility model discloses a dimming circuit of a self-adaptive silkworm breeding system. The dimming circuit comprises a photoresistor, a double-voltage comparator, a bidirectional analog switch, an optical coupler and a constant-current light-emitting circuit, wherein the input end of the double-voltage comparator is coupled with the photoresistor; the control end of the bidirectional analog switch is coupled with the output end of the double-voltage comparator, the output end of the bidirectional analog switch is coupled with a light-emitting source of the optical coupler, and a light receiver of the optical coupler is coupled with the constant-current light-emitting circuit. According to the dimming circuit of the self-adaptive silkworm breeding system, an original photoresistor and a double-voltage comparator are reserved, and a bidirectional analog switch, an optical coupler and a constant-current light-emitting circuit are added. The double-voltage comparator compares and guides the bidirectional analog switch and then switches on the constant-current light-emitting circuit through the optical coupler, and the constant-current light-emitting circuit carries out constant-current adjustment on the input current, so that accurate adjustment of the light brightness is realized.

Description

Technical Field

[0001] The embodiment of the utility model relates to a circuit structure, in particular to a dimming circuit of an adaptive silkworm breeding system. Background Art

[0002] In sericulture, light is a crucial factor influencing silkworm growth and development. Traditional manual lighting control methods are inefficient and difficult to precisely control, including intensity and duration, making it difficult to meet the specific lighting needs of silkworms at different stages of their growth. With the advancement of intelligent agriculture, intelligent sericulture systems have emerged. Dimming circuits, as a key component, are crucial for achieving precise light control.

[0003] The utility model patent with the authorization announcement number CN205320334U discloses a voice-recognizable LED energy-saving lamp dimming circuit. In its specification, paragraph

[0023] discloses: a central control module includes an ATMEGA328P single-chip microcomputer (4), an LED energy-saving lamp (5), a photoresistor (7), a key switch (8), a field-effect transistor control circuit (9), an LM393 voltage comparator (17), a status indicator light (18), and a host computer communication interface (19). The photoresistor (7) converts the light intensity into a voltage signal and transmits it to the INA+ pin of the LM393 voltage comparator (17). The voltage signal is then processed by the LM393 voltage comparator (17) and output from the OUTA pin. Finally, the voltage signal is transmitted to the A0 analog pin of the ATMEGA328P single-chip microcomputer (4). One end of the key switch (8) is connected to the D2 digital pin of the ATMEGA328P single-chip microcomputer (4). When the key is pressed, the D2 pin can obtain a low-level signal. The field effect tube control circuit (9) is composed of a PC817 four-pin optocoupler and an IRF9630PBF field effect tube. The D3 digital PWM pin of the ATMEGA328P single chip computer (4) is connected to the signal input end of the optocoupler, and the PWM wave control signal is transmitted through the pin. The signal output end of the optocoupler is connected to the gate of the field effect tube, and the current flowing through the field effect tube is dynamically controlled, thereby controlling the luminous brightness of the LED energy-saving lamp.

[0004] An analysis of the aforementioned prior art reveals that adding a photosensor unit to the circuit can detect ambient light intensity and adaptively adjust the brightness of the LED energy-saving lamp, making it suitable for light regulation in sericulture. However, since LED lamps are primarily current-sensitive components, their forward voltage drop has significant variability. To ensure uniform brightness across the digital tube, a constant operating current is required. However, the aforementioned prior art LED energy-saving lamps lack constant current control. Utility Model Content

[0005] The purpose of this utility model is to address the above-mentioned defects in the prior art and provide a dimming circuit with constant current control for an adaptive silkworm breeding system.

[0006] To achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical solution: a dimming circuit of an adaptive silkworm breeding system, including a photoresistor, a dual voltage comparator whose input end is coupled to the photoresistor, a bidirectional analog switch, an optocoupler and a constant current light-emitting circuit; the control end of the bidirectional analog switch is coupled to the output end of the dual voltage comparator, the output end of the bidirectional analog switch is coupled to the light source of the optocoupler, and the light receiver of the optocoupler is coupled to the constant current light-emitting circuit.

[0007] In addition, the present invention also provides the following auxiliary technical solutions:

[0008] The photoresistor is a 5528 type photoresistor, one end of which is coupled to a power supply, and the other end of which is coupled to a non-inverting input of a dual voltage comparator.

[0009] The dual voltage comparator is LM393, whose inverting input is coupled to a photoresistor, its non-inverting input is coupled to a power supply via a current-limiting resistor, and its output is coupled to the control terminal of a bidirectional analog switch and is also coupled to the power supply via a pull-up resistor.

[0010] The model of the bidirectional analog switch is 74HC4066.

[0011] The constant current lighting circuit includes an LED driver chip, a potentiometer, an inductor, an output diode and at least one LED lamp; wherein the LED driver chip is an LM3410 chip, its first pin is grounded, its second pin is coupled to the power supply, its third pin is coupled to the light receiver of the optocoupler, its fourth pin is coupled to the potentiometer, its fifth pin is grounded, and its sixth pin is coupled to one end of the inductor and the anode of the output diode; the other end of the inductor is coupled to the power supply for ballast; the cathode of the output diode is coupled to at least one LED lamp for freewheeling.

[0012] The constant current lighting circuit further includes an input capacitor coupled between the power supply and the ground.

[0013] The constant current lighting circuit further includes an output capacitor, which is connected in parallel with at least one LED lamp.

[0014] Compared to existing technologies, the dimming circuit of the adaptive silkworm rearing system in this utility model has the following advantages: it retains the original photoresistor and dual voltage comparator, while adding a bidirectional analog switch, an optocoupler, and a constant current lighting circuit. The dual voltage comparator compares the bidirectional analog switch, which then switches on the constant current lighting circuit via the optocoupler. The constant current lighting circuit regulates the input current, thereby achieving precise adjustment of the light brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below only relate to some embodiments of the present invention and are not limitations of the present invention.

[0016] Figure 1 4 is a circuit diagram of a dimming circuit of the adaptive silkworm breeding system of this embodiment. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the technical solution of the present invention is further described in non-limiting detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] The dimming circuit of the adaptive silkworm rearing system of this embodiment is mainly used to adjust the light in the silkworm room, increase the lighting time, and improve silkworm rearing efficiency. The dimming circuit mainly includes: photoresistor RG1, dual voltage comparator U1, bidirectional analog switch U2, optocoupler U3 and constant current light-emitting circuit.

[0019] Photoresistor RG1 is a 5528 type photoresistor, one end of which is coupled to the power supply (VCC) and the other end is coupled to the inverting input of dual voltage comparator U1. Dual voltage comparator U1 is an LM393 model. Its inverting input is coupled to photoresistor RG1, and its non-inverting input is coupled to the power supply (VCC) through a current-limiting resistor R1.

[0020] A photoresistor is a special resistor made of semiconductor materials such as sulfide or selenide. Its operating principle is based on the internal photoelectric effect, and its resistance changes with changes in light intensity. The photosensitivity characteristic of the 5528-type photoresistor in this embodiment is: the stronger the light intensity, the smaller the resistance, and the smaller the light intensity, the larger the resistance. During operation, as the light intensity decreases, the resistance of photoresistor RG1 increases. Because photoresistor RG1 is coupled to the inverting input of dual voltage comparator U1, the voltage at the non-inverting input of dual voltage comparator U1 is higher than the voltage at the inverting input, resulting in a high-level signal at the output of dual voltage comparator U1. Conversely, as the light intensity increases, the output of dual voltage comparator U1 generates a low-level signal.

[0021] The output terminal of the dual voltage comparator U1 is coupled to the control terminal of the bidirectional analog switch and is also coupled to the power supply (VCC) through a pull-up resistor R2. The main function of the pull-up resistor R2 is to ensure that the dual voltage comparator U1 can output a high level.

[0022] The bidirectional analog switch U2 is a 74HC4066 four-way switch analog circuit chip that uses CMOS technology and consists of four independent double-pole four-way switches. Each switch has an input terminal (nY), an output terminal (nZ) and a control terminal (nE). The output of the dual voltage comparator U1 is coupled to the control terminal (nE).

[0023] Since the model of the bidirectional analog switch U2 in this embodiment is a 74HC4066 four-way switch analog circuit chip, one bidirectional analog switch U2 can be connected to a series circuit of four photoresistors RG1 and a dual voltage comparator U1. However, for the sake of simplicity, the accompanying drawings of this embodiment only show a series circuit of one photoresistor RG1 and a dual voltage comparator U1.

[0024] When the control terminal (nE) input is high, the corresponding switch opens, and the input signal is transmitted through the input terminal (nY) to the corresponding output terminal (nZ). When the control terminal input is low, the corresponding switch closes, and the input signal cannot pass through. Therefore, combined with the above, when the light intensity decreases, the resistance of photoresistor RG1 increases, the output of dual voltage comparator U1 outputs a high-level signal, the control terminal input of bidirectional analog switch U2 is high, and the corresponding switch opens.

[0025] The input terminal of bidirectional analog switch U2 is coupled to the power supply, and the output terminal is coupled to the positive electrode of the light source of optocoupler U3. The negative electrode of the light source of optocoupler U3 is grounded. The collector of optocoupler U3's light receiver is coupled to the power supply, and the emitter of optocoupler U3's light receiver is coupled to the constant current light circuit. The main function of optocoupler U3 is to trigger the constant current light circuit and to electrically isolate the front and back stages because the voltage of the LED lamp in the back stage is higher.

[0026] The constant current lighting circuit mainly includes LED driver chip U4, potentiometer RT1, inductor L1, output diode D1, input capacitor C1, output capacitor C2 and at least one LED lamp D2. If there are multiple LED lamps, they are connected in series.

[0027] LED driver chip U4 uses the LM3410 type LED driver chip. Its first pin is grounded (not shown), its second pin (VIN terminal) is coupled to the power supply, its third pin (DIM terminal) is coupled to the emitter of the light receiver of the optocoupler U3 through a resistor R6, its fourth pin (FB terminal) is coupled to the potentiometer RT1, its fifth pin (GND terminal) is grounded, and its sixth pin (SW terminal) is coupled to one end of the inductor L1 and the anode of the output diode D1. The other end of the inductor L1 is coupled to the power supply for ballast. The cathode of the output diode D1 is coupled to the LED lamp D2 for freewheeling. The input capacitor C1 is coupled between the power supply and ground for input filtering. The output capacitor C2 is connected in parallel with the LED lamp for output filtering. The potentiometer RT1 can be used to adjust the voltage divider of the LED lamp, thereby adjusting the brightness of the LED lamp.

[0028] The dimming circuit of the adaptive silkworm breeding system of this embodiment first receives different light intensities through a photoresistor, changes the resistance value of the resistor according to the different light intensities to obtain different voltage divider ratios, and then compares the voltages through a dual voltage comparator and directs them to a bidirectional analog switch. The bidirectional analog switch is turned on and isolates and amplifies the signal to the LED driver chip through an optical coupling tube. The LED driver chip controls the constant current output of the LED lamp power supply, thereby achieving precise adjustment of the light brightness.

[0029] It should be noted that the above preferred embodiments are merely illustrative of the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to fall within the scope of protection of the present invention.

Claims

1. A dimming circuit for an adaptive silkworm breeding system, comprising a photoresistor and a dual voltage comparator having an input terminal coupled to the photoresistor, characterized in that: It also includes a bidirectional analog switch, an optocoupler and a constant current light-emitting circuit; the control end of the bidirectional analog switch is coupled to the output end of the dual voltage comparator, the output end of the bidirectional analog switch is coupled to the light source of the optocoupler, and the light receiver of the optocoupler is coupled to the constant current light-emitting circuit.

2. The dimming circuit of the adaptive silkworm breeding system according to claim 1, characterized in that: The photoresistor is a 5528 type, one end of which is coupled to a power supply, and the other end of which is coupled to a non-inverting input end of a dual voltage comparator.

3. The dimming circuit of the adaptive silkworm breeding system according to claim 1, characterized in that: The dual voltage comparator is of LM393 type, whose inverting input is coupled to a photoresistor, whose non-inverting input is coupled to a power supply via a current-limiting resistor, whose output is coupled to a control terminal of a bidirectional analog switch, and is also coupled to a power supply via a pull-up resistor.

4. The dimming circuit of the adaptive silkworm breeding system according to claim 1, characterized in that: The model of the bidirectional analog switch is 74HC4066.

5. The dimming circuit of the adaptive silkworm breeding system according to claim 1, characterized in that: The constant current light-emitting circuit includes an LED driver chip, a potentiometer, an inductor, an output diode and at least one LED lamp; wherein the LED driver chip is an LM3410 chip, its first pin is grounded, its second pin is coupled to a power supply, its third pin is coupled to a light receiver of an optocoupler, its fourth pin is coupled to a potentiometer, its fifth pin is grounded, and its sixth pin is coupled to one end of the inductor and the anode of the output diode; the other end of the inductor is coupled to a power supply for ballast; the cathode of the output diode is coupled to at least one LED lamp for freewheeling.

6. The dimming circuit of the adaptive silkworm breeding system according to claim 5, characterized in that: The constant current light emitting circuit further includes an input capacitor coupled between a power supply and a ground.

7. The dimming circuit of the adaptive silkworm breeding system according to claim 5, characterized in that: The constant current lighting circuit further includes an output capacitor, which is connected in parallel with at least one LED lamp.

Images