Plant light supplementing circuit based on current mirror

Abstract

The utility model relates to the technical field of plant light supplement, and discloses a plant light supplement circuit based on a current mirror, which comprises a power supply unit, an illumination intensity detection unit, a control unit, a digital-to-analog conversion unit, an operational amplifier, an MOS (Metal Oxide Semiconductor) transistor N1 and a resistor, the current mirror comprises a main branch and at least two slave branches, and each slave branch is used for proportionally copying current flowing through the main branch; in actual use, after the light intensity is detected by the light intensity detection unit, the current input to the luminescent lamp can be controlled by controlling the analog voltage output by the digital-to-analog conversion unit and controlling the on-off number of the control switches, so that the luminescent current of the luminescent lamp can be adjusted, and the service life of the luminescent lamp is prolonged. And the applicability of the utility model is better.

Description

Technical Field

[0001] The utility model relates to the technical field of plant supplementary lighting, and particularly relates to a plant supplementary lighting circuit based on a current mirror. Background Art

[0002] Light has a close relationship with the growth of crops. Maximally capturing light energy and giving full play to the potential of plant photosynthesis will directly relate to the efficiency of agricultural production. However, due to the short sunshine time in winter and spring, the growth of crops is slow and the yield is low, so supplementary lighting is urgently needed.

[0003] When the existing plant supplementary lighting circuits are in use, they directly drive the light-emitting lamps to emit light, and cannot adjust the light-emitting intensity of the light-emitting lamps, so the applicability is poor. Summary of the Utility Model

[0004] In view of the deficiencies of the background art, the utility model provides a plant supplementary lighting circuit based on a current mirror, and the technical problem to be solved is that the existing plant supplementary lighting circuit cannot adjust the intensity of the light-emitting lamp during supplementary lighting, and the applicability is poor.

[0005] To solve the above technical problems, the utility model provides the following technical solutions: A plant supplementary lighting circuit based on a current mirror, comprising a power supply unit, a light intensity detection unit, a control unit, a digital-to-analog conversion unit, an operational amplifier, an MOS transistor N1 and a resistor;

[0006] The current mirror includes a main branch and at least two slave branches, and each slave branch is used for proportionally replicating the current flowing through the main branch;

[0007] The power supply unit is electrically connected to the control unit and the digital-to-analog conversion unit respectively, and provides a working voltage for the control unit and the digital-to-analog conversion unit;

[0008] The control unit is electrically connected to the light intensity detection unit and the digital-to-analog conversion unit respectively, detects the light intensity through the light intensity detection unit, and outputs an analog voltage with adjustable voltage through the digital-to-analog conversion unit;

[0009] The analog voltage is input to the positive input terminal of the operational amplifier, the negative input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier and the gate of the MOS transistor N1 respectively, the drain of the MOS transistor N1 is electrically connected to the main branch, and the source of the MOS transistor N1 is grounded through a resistor R1;

[0010] The current output terminal of each slave branch is electrically connected with a control switch respectively, the input terminal of the control switch is electrically connected with the current output terminal of the slave branch, the control unit is electrically connected with the control terminals of all the control switches, the output terminals of all the control switches are electrically connected with each other, and are electrically connected with a light-emitting lamp.

[0011] In some embodiments, the power supply unit includes a lithium battery and a voltage stabilizing unit. The voltage stabilizing unit stabilizes the output voltage of the lithium battery and provides operating voltage to the control unit and the digital-to-analog conversion unit.

[0012] In some embodiments, the voltage stabilizing unit includes a voltage stabilizing chip with the model number 78L05.

[0013] In some embodiments, the present utility model further includes a solar charging unit. The solar charging unit is electrically connected to the lithium battery and is used to charge the lithium battery.

[0014] In some embodiments, the control switch is an NMOS transistor. The drain of the NMOS transistor is the input end of the control switch, the gate of the NMOS transistor is the control end of the control switch, and the source of the NMOS transistor is the output end of the control switch.

[0015] In some embodiments, the main branch includes a MOS transistor P1 and four sub-branches. Each of the four sub-branches includes a MOS transistor. The MOS transistors included in the four sub-branches are respectively denoted as MOS transistor P2, MOS transistor P3, MOS transistor P4, and MOS transistor P5. The source of the MOS transistor P1 is electrically connected to the sources of the MOS transistor P2, the MOS transistor P3, the MOS transistor P4, and the MOS transistor P5 respectively for connecting to the power supply VCC. The gate of the MOS transistor P1 is electrically connected to the gates of the MOS transistor P2, the MOS transistor P3, the MOS transistor P4, the MOS transistor P5, the drain of the MOS transistor P1, and the drain of the MOS transistor N1 respectively. The drains of the MOS transistor P2, the MOS transistor P3, the MOS transistor P4, and the MOS transistor P5 are the current output ends of the sub-branches.

[0016] In some embodiments, the proportion of the current flowing through each sub-branch that replicates the current flowing through the main branch is the same or different.

[0017] In some embodiments, the light intensity detection unit is a light sensor.

[0018] In some embodiments, one end of the light-emitting lamp is electrically connected to the output end of the control switch, and the other end of the light-emitting lamp is electrically connected to the control unit, or the other end of the light-emitting lamp is grounded through a second resistor.

[0019] The beneficial effects of the present utility model compared with the prior art are as follows: In actual use, after the light intensity detection unit of the present utility model detects the light intensity, on the one hand, by controlling the magnitude of the analog voltage output by the digital-to-analog conversion unit, and on the other hand, by controlling the on / off quantity of the control switch, the magnitude of the current input to the light-emitting lamp can be controlled, so that the adjustment of the light-emitting current of the light-emitting lamp can be realized, making the applicability of the present utility model better. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the present utility model in the embodiment. Detailed Description of the Preferred Embodiment

[0021] The present utility model will be further described in detail below with reference to the drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present utility model in a schematic way, so they only show the components related to the present utility model.

[0022] As Figure 1 shown, a plant supplementary lighting circuit based on a current mirror includes a power supply unit 1, a light intensity detection unit 3, a control unit 2, a digital-to-analog conversion unit 4, an operational amplifier CMP, a MOS transistor N1, and a resistor R1;

[0023] The current mirror includes a main branch and at least two slave branches, and each slave branch is used to proportionally copy the current flowing through the main branch;

[0024] The power supply unit 1 is electrically connected to the control unit 2 and the digital-to-analog conversion unit 4 respectively, and provides working voltage for the control unit 1 and the digital-to-analog conversion unit 4;

[0025] The control unit 2 is electrically connected to the light intensity detection unit 3 and the digital-to-analog conversion unit 4 respectively, detects the light intensity through the light intensity detection unit 3, and outputs an analog voltage with adjustable voltage through the digital-to-analog conversion unit 4;

[0026] The analog voltage is input to the positive input terminal of the operational amplifier CMP. The negative input terminal of the operational amplifier CMP is electrically connected to the output terminal of the operational amplifier CMP and the gate of the MOS transistor N1 respectively. The drain of the MOS transistor N1 is electrically connected to the main branch, and the source of the MOS transistor N1 is grounded through the resistor R1;

[0027] The current output terminal of each slave branch is electrically connected to a control switch respectively. The input terminal of the control switch is electrically connected to the current output terminal of the slave branch. The control unit is electrically connected to the control terminals of all the control switches. The output terminals of all the control switches are electrically connected to each other and are electrically connected to a light-emitting lamp.

[0028] In actual use, after the present utility model detects the light intensity through the light intensity detection unit 3, on the one hand, by controlling the magnitude of the analog voltage output by the digital-to-analog conversion unit 4, and on the other hand, by controlling the on-off number of the control switches, the magnitude of the current input to the light-emitting lamp can be controlled, so that the adjustment of the light-emitting current of the light-emitting lamp can be realized, making the applicability of the present utility model better.

[0029] Specifically, assuming that the analog voltage is U1, the current I flowing through the main branch is I = U1 / R1, and the current I is copied by the slave branch and then input to the light-emitting lamp.

[0030] Specifically, in this embodiment, the power supply unit 1 includes a lithium battery and a voltage stabilizing unit. The voltage stabilizing unit stabilizes the output voltage of the lithium battery and provides the working voltage to the control unit 2 and the digital-to-analog conversion unit 4. The voltage stabilizing unit includes a voltage stabilizing chip with the model number 78L05.

[0031] In this embodiment, in order to ensure the battery life of the lithium battery and not introduce the charging voltage from the power grid for the lithium battery, the present utility model further includes a solar charging unit 5. The solar charging unit 5 is electrically connected to the lithium battery and is used to charge the lithium battery, realizing the clean supplementary lighting for plants.

[0032] Specifically, in this embodiment, the control switch is an NMOS transistor. The drain of the NMOS transistor is the input end of the control switch, the gate of the NMOS transistor is the control end of the control switch, and the source of the NMOS transistor is the output end of the control switch.

[0033] Specifically, in this embodiment, the main branch includes a MOS transistor P1 and four sub-branches. Each of the four sub-branches includes a MOS transistor. The MOS transistors included in the four sub-branches are respectively denoted as MOS transistor P2, MOS transistor P3, MOS transistor P4, and MOS transistor P5. The source of the MOS transistor P1 is electrically connected to the sources of the MOS transistor P2, the MOS transistor P3, the MOS transistor P4, and the MOS transistor P5 respectively for accessing the power supply VCC. The gate of the MOS transistor P1 is electrically connected to the gates of the MOS transistor P2, the MOS transistor P3, the MOS transistor P4, the MOS transistor P5, the drain of the MOS transistor P1, and the drain of the MOS transistor N1. The drains of the MOS transistor P2, the MOS transistor P3, the MOS transistor P4, and the MOS transistor P5 are the current output ends of the sub-branches.

[0034] In addition, since there are four sub-branches in total, there are four control switches in total. One sub-branch is electrically connected to one control switch.

[0035] Specifically, in this embodiment, the ratio of the current flowing through each sub-branch to the current flowing through the main branch can be the same or different. When the ratio of the current flowing through each sub-branch to the current flowing through the main branch is the same, the ratio can be 1.

[0036] In a certain implementation manner, the number of sub-branches can be increased according to actual needs.

[0037] Specifically, in this embodiment, the light intensity detection unit 3 is a light sensor. The light intensity can be detected by setting four light sensors. In addition, when it is necessary to detect the intensity of light of a specific color, a corresponding filter can be set in front of the light sensor. Exemplary filters can be red, green, or blue.

[0038] Specifically, in this embodiment, there are three light-emitting lamps in total, namely light-emitting lamp LED1, light-emitting lamp LED2, and light-emitting lamp LED3, and the light-emitting lamps are light-emitting diodes; one end of the three light-emitting lamps is electrically connected to the output end of the control switch, and the other end of the light-emitting lamp can be electrically connected to the control unit 2. At this time, on the basis of adjusting the current flowing through the light-emitting lamp, the supplementary light intensity can also be adjusted by controlling whether the light-emitting lamp emits light, or the other end of the light-emitting lamp is grounded through a second resistor.

[0039] Specifically, in this embodiment, the control unit 2 can be a single-chip microcomputer, and the single-chip microcomputer can be selected according to actual needs. Among them, it can be a single-chip microcomputer of the STM32 series or a single-chip microcomputer of the STC series.

[0040] Inspired by the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A plant light supplement circuit based on current mirror, characterized in that: It includes a power supply unit, a light intensity detection unit, a control unit, a digital-to-analog conversion unit, an operational amplifier, a MOS tube N1 and a resistor; The current mirror comprises a main branch and at least two slave branches, each of which is used to proportionally replicate the current flowing through the main branch; The power supply unit is electrically connected to the control unit and the digital-to-analog conversion unit, respectively, to provide working voltage for the control unit and the digital-to-analog conversion unit; The control unit is electrically connected to the light intensity detection unit and the digital-to-analog conversion unit respectively, detects light intensity through the light intensity detection unit, and outputs an analog voltage with adjustable voltage through the digital-to-analog conversion unit; The analog voltage is input to the positive input terminal of the operational amplifier, the negative input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier and the gate of the MOS tube N1 respectively, the drain of the MOS tube N1 is electrically connected to the main branch, and the source of the MOS tube N1 is grounded through the resistor R1; The current output end of each slave branch is electrically connected to a control switch, the input end of the control switch is electrically connected to the current output end of the slave branch, the control unit is electrically connected to the control ends of all the control switches, the output ends of all the control switches are electrically connected to each other, and are electrically connected to a light-emitting lamp.

2. According to the plant light supplement circuit based on current mirror according to claim 1, it is characterized in that: The power supply unit includes a lithium battery and a voltage stabilizing unit. The voltage stabilizing unit stabilizes the output voltage of the lithium battery and provides an operating voltage to the control unit and the digital-to-analog conversion unit.

3. A plant light supplement circuit based on current mirror according to claim 2, characterized in that: The voltage stabilizing unit includes a voltage stabilizing chip of model 78L05.

4. The plant light supplement circuit based on current mirror according to claim 3, characterized in that: It also includes a solar charging unit, which is electrically connected to the lithium battery and is used to charge the lithium battery.

5. The plant light supplement circuit based on current mirror according to claim 1, characterized in that: The control switch is an NMOS tube, the drain of the NMOS tube is the input end of the control switch, the gate of the NMOS tube is the control end of the control switch, and the source of the NMOS tube is the output end of the control switch.

6. The plant light supplement circuit based on current mirror according to claim 1, characterized in that: The main branch includes a MOS transistor P1 and four slave branches. The four slave branches include MOS transistors respectively. The MOS transistors included in the four slave branches are respectively recorded as MOS transistor P2, MOS transistor P3, MOS transistor P4 and MOS transistor P. The source of the MOS transistor P1 is respectively electrically connected to the source of the MOS transistor P2, the source of the MOS transistor P3, the source of the MOS transistor P4 and the source of the MOS transistor P5 for accessing the power supply VCC. The gate of the MOS transistor P1 is respectively electrically connected to the gate of the MOS transistor P2, the gate of the MOS transistor P3, the gate of the MOS transistor P4, the gate of the MOS transistor P5, the drain of the MOS transistor P1 and the drain of the MOS transistor N1. The drain of the MOS transistor P2, the drain of the MOS transistor P3, the drain of the MOS transistor P4 and the drain of the MOS transistor P5 are current output ends of the slave branches.

7. The plant light supplement circuit based on current mirror according to claim 1, characterized in that: Each slave branch copies the current flowing through the main branch in the same or different proportions.

8. The plant light supplement circuit based on current mirror according to claim 1, characterized in that: The light intensity detection unit is a light sensor.

9. The plant light supplement circuit based on current mirror according to claim 1, characterized in that: One end of the light emitting lamp is electrically connected to the output end of the control switch, and the other end of the light emitting lamp is electrically connected to the control unit, or the other end of the light emitting lamp is grounded through a second resistor.

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