Signal processing circuit of intelligent vegetation growth monitoring system

Abstract

The utility model discloses a signal processing circuit of an intelligent vegetation growth monitoring system. The signal processing circuit comprises a first amplification module, an adjustable gain module, a comparison voltage providing module, a comparison module and a second amplification module, an input end of the first amplification module is connected to a to-be-processed illumination intensity electric signal, a first gain end of the first amplification module is connected to a first end of the adjustable gain module, and a second end of the adjustable gain module is connected to a second gain end of the first amplification module; an in-phase input end of the comparison module is connected with a to-be-processed illumination intensity electric signal, and an inverted input end of the comparison module is connected with an output end of the comparison voltage providing module; the adjustable gain module comprises a gain resistor unit, a first controllable switch unit, a second controllable switch unit and a switch power supply unit. The signal processing circuit of the intelligent vegetation growth monitoring system solves the problem that a monitoring controller is easily damaged due to an overlarge light intensity amplification signal caused by a certain amplification proportion of a signal processing circuit in the prior art.

Description

Technical Field

[0001] The utility model relates to a signal processing circuit, in particular to a signal processing circuit of a vegetation growth intelligent monitoring system. Background Art

[0002] The intelligent vegetation growth monitoring system includes: a light intensity sensor, a signal processing circuit and a monitoring controller. The light intensity sensor is used to monitor the light intensity of the vegetation growth environment. The greater the light intensity, the greater the voltage value output by the light intensity sensor. The output end of the light intensity sensor is connected to the signal processing circuit. The signal processing circuit is used to amplify the light intensity electrical signal output by the light intensity sensor to obtain an amplified light intensity amplified signal. The output end of the signal processing circuit is connected to the input end of the monitoring controller.

[0003] Although the above-mentioned signal processing circuit can amplify the light intensity signal, the signal processing circuit still has the following disadvantages: due to seasonal changes, the light intensity varies greatly, the light intensity electrical signal varies in a large range, and the amplification ratio of the signal processing circuit is certain, which leads to the light intensity amplification signal being too large when the light intensity is extremely high. The voltage input range of the monitoring controller is limited, and the excessive light intensity amplification signal can easily damage the monitoring controller. Utility Model Content

[0004] The utility model provides a signal processing circuit for a vegetation growth intelligent monitoring system, which solves the problem in the prior art that a certain amplification ratio of the signal processing circuit leads to excessive light intensity amplification signal which easily damages the monitoring controller.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a signal processing circuit of a vegetation growth intelligent monitoring system, comprising: a first amplifying module, an adjustable gain module, a comparison voltage providing module, a comparison module and a second amplifying module; the input end of the first amplifying module is connected to a light intensity electrical signal to be processed, the first gain end of the first amplifying module is connected to the first end of the adjustable gain module, and the second end of the adjustable gain module is connected to the second gain end of the first amplifying module; the non-inverting input end of the comparison module is connected to the light intensity electrical signal to be processed, the inverting input end of the comparison module is connected to the output end of the comparison voltage providing module, and the output end of the comparison module is connected to the input end of the second amplifying module; the adjustable gain module comprises: a gain resistor unit, a first controllable switch unit, a second controllable switch unit and a switch power supply unit, the first controllable switch unit comprises: a switch execution part and a coil part, the switch execution part is arranged in the gain resistor unit, the gain resistor unit is provided with a first end and a second end, the switch execution part is used to adjust the resistance value between the first end and the second end of the gain resistor unit according to whether the coil part is energized, the switch power supply part is used to power the coil part through the second controllable switch unit, and the control end of the second controllable switch unit is connected to the output end of the second amplifying module.

[0007] Preferably, the switch execution part is a single-pole double-throw switch, and the gain resistor unit includes: a resistor R1 and a resistor R2, the fixed end of the single-pole double-throw switch is the first end of the gain resistor unit, the first active end of the single-pole double-throw switch is connected to the first end of the resistor R1, the second active end of the single-pole double-throw switch is connected to the first end of the resistor R2, and the second end of the resistor R1 and the second end of the resistor R2 are connected to form the second end of the gain resistor unit.

[0008] Preferably, the first amplifier module includes: resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, sliding resistor RV1, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5 and amplifier chip U1, the DC power supply VCC is connected to the first end of resistor R3 through resistor R6, the first end of resistor R3 is the input end of the first amplifier module, resistor R3 is connected to the non-inverting input end of the amplifier chip U1, the DC power supply VCC is connected to the first fixed end of the sliding resistor RV1 and the sliding end of the sliding resistor RV1 through resistor R5, the second fixed end of the sliding resistor RV1 is grounded, and the sliding end of the sliding resistor RV1 is connected to the inverting input end of the amplifier chip U1 through resistor R4. The DC power supply VCC supplies power to the power supply end of the amplifier chip U1, the positive pole of the capacitor C1 is connected to the power supply end of the amplifier chip U1, the negative pole of the capacitor C1, the negative pole of the capacitor C2, the negative pole of the capacitor C4 and the negative pole of the capacitor C5 are all grounded, the positive pole of the capacitor C2 and the positive pole of the capacitor C3 are both connected to the non-inverting input end of the amplifier chip U1, the inverting input end of the amplifier chip U1 is connected to the negative pole of the capacitor C3 and the positive pole of the capacitor C4, the eighth pin of the amplifier chip U1 is the first gain end of the first amplifier module, the first pin of the amplifier chip U1 is the second gain end of the first amplifier module, the output end of the amplifier chip U1 is connected to the first end of the resistor R7, the second end of the resistor R7 is the output end of the first amplifier module, and the second end of the resistor R7 is connected to the positive pole of the capacitor C5.

[0009] Preferably, the comparison voltage providing module includes: resistors R8 and R10, the DC power supply VCC is connected to the first end of the resistor R8, the second end of the resistor R8 is grounded through the resistor R9, and the second end of the resistor R8 is the output end of the comparison voltage providing module.

[0010] Preferably, the comparison module includes: a comparator U2, a resistor R9 and a resistor R11, the first end of the resistor R9 is the non-inverting input end of the comparison module, the resistor R9 is connected to the non-inverting input end of the comparator U2, the inverting input end of the comparator U2 is the inverting input end of the comparison module, the inverting input end of the comparator U2 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to the output end of the comparator U2, and the output end of the comparator U2 is the output end of the comparison module.

[0011] Preferably, the second amplifying module includes: an amplifier U3, a resistor R12 and a resistor R13, the input end of the amplifier U3 is the input end of the second amplifying module, the output end of the amplifier U3 is connected to the first end of the resistor R12 and the first end of the resistor R13, the second end of the resistor R12 is the output end of the second amplifying module, and the second end of the resistor R13 is grounded.

[0012] Preferably, the second controllable switch unit includes: a switching transistor Q1, the switching power supply unit includes: a resistor R14, the first end of the resistor R14 is connected to the DC power supply power, the second end of the resistor R14 is connected to one end of the coil part, the other end of the coil part is connected to the collector of the switching transistor Q1, the base of the switching transistor Q1 is the control end of the second controllable switch unit, and the emitter of the second controllable switch unit is grounded.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In the present application, by setting an adjustable gain module between the first gain end and the second gain end of the first amplifying module, it is possible to adjust the gain of the first amplifying module, that is, the amplification ratio of the first amplifying module can be adjusted as needed, and the amplification ratio of the first amplifying module is adjusted according to the output of the comparison module. When the light intensity electrical signal input1 is greater than the set value, the voltage at the comparison module's non-inverting input is higher than the voltage at the comparison module's inverting input. The comparison module outputs a high level, and the second amplifier module amplifies this high level to drive the second controllable switch unit to close. At this time, the coil portion of the first controllable switch unit is energized, and the switch execution unit in the first controllable switch unit switches to resistor R2, thereby reducing the gain to prevent excessive gain from causing the monitoring controller to be unable to access. When the light intensity electrical signal input1 is less than or equal to the set value, the voltage at the comparison module's non-inverting input is less than or equal to the voltage at the comparison module's inverting input. The comparison module outputs a low level, and the second amplifier module amplifies this low level and cannot drive the second controllable switch unit to close. At this time, the coil portion of the first controllable switch unit is not energized, and the switch execution unit in the first controllable switch unit remains connected to resistor R1, thereby increasing the gain. This ensures a high gain, allowing the amplified light intensity electrical signal input1 to be recognized by the monitoring controller. The control terminal of the first controllable switch unit is connected to the monitoring controller to determine whether it has switched to resistor R2.

[0015] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the circuit diagram of the first amplification module in the signal processing circuit of the vegetation growth intelligent monitoring system.

[0017] Figure 2 This is a circuit diagram of the comparison voltage providing module, the comparison module, and the second amplification module in the signal processing circuit of the vegetation growth intelligent monitoring system. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and functions of the present invention clearer and easier to understand, the present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0019] like Figure 1 as well as Figure 2 As shown, the utility model discloses a signal processing circuit of a vegetation growth intelligent monitoring system, comprising: a first amplifying module, an adjustable gain module, a comparison voltage providing module, a comparison module, and a second amplifying module; the input end of the first amplifying module is connected to the light intensity electrical signal input1 to be processed, the first gain end of the first amplifying module is connected to the first end of the adjustable gain module, and the second end of the adjustable gain module is connected to the second gain end of the first amplifying module; the non-inverting input end of the comparison module is connected to the light intensity electrical signal input1 to be processed, the inverting input end of the comparison module is connected to the output end of the comparison voltage providing module, and the output end of the comparison module is connected to the input end of the second amplifying module; the adjustable gain module comprises: a gain resistor unit, a first controllable switch unit, a second controllable switch unit, and a switch power supply unit. The first controllable switch unit comprises: a switch execution unit and a coil unit. The switch execution unit is provided in the gain resistor unit. The gain resistor unit is provided with a first end and a second end. The switch execution unit is used to adjust the resistance value between the first end and the second end of the gain resistor unit according to whether the coil unit is energized. The switch power supply unit is used to power the coil unit through the second controllable switch unit. The control end of the second controllable switch unit is connected to the output end of the second amplifying module. The first controllable switch unit is a relay RL1 .

[0020] The switch actuator is a single-pole double-throw switch. The gain resistor unit includes resistors R1 and R2. The fixed end of the SPDT switch serves as the first end of the gain resistor unit. The first movable end of the SPDT switch is connected to the first end of resistor R1. The second movable end of the SPDT switch is connected to the first end of resistor R2. The second end of resistor R1 and the second end of resistor R2 are connected to form the second end of the gain resistor unit. The SPDT switch in the first controllable switch unit can switch between connecting to resistor R1 and connecting to resistor R2.

[0021] The first amplifier module includes: resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, sliding resistor RV1, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5 and amplifier chip U1, the DC power supply VCC is connected to the first end of resistor R3 through resistor R6, the first end of resistor R3 is the input end of the first amplifier module, resistor R3 is connected to the non-inverting input end of the amplifier chip U1, the DC power supply VCC is connected to the first fixed end of the sliding resistor RV1 and the sliding end of the sliding resistor RV1 through resistor R5, the second fixed end of the sliding resistor RV1 is grounded, the sliding end of the sliding resistor RV1 is connected to the inverting input end of the amplifier chip U1 through resistor R4, and the DC power supply VCC is connected to the first fixed end of the sliding resistor RV1 and the sliding end of the sliding resistor RV1 through resistor R5. Source VCC powers the power supply terminal of amplifier chip U1. The positive terminal of capacitor C1 is connected to the power supply terminal of amplifier chip U1. The negative terminals of capacitors C1, C2, C4, and C5 are all grounded. The positive terminals of capacitors C2 and C3 are connected to the non-inverting input terminal of amplifier chip U1. The inverting input terminal of amplifier chip U1 is connected to the negative terminal of capacitor C3 and the positive terminal of capacitor C4. The eighth pin of amplifier chip U1 is the first gain terminal of the first amplifier module, and the first pin of amplifier chip U1 is the second gain terminal of the first amplifier module. The output terminal of amplifier chip U1 is connected to the first terminal of resistor R7. The second terminal of resistor R7 is the output terminal of the first amplifier module, and the second terminal of resistor R7 is connected to the positive terminal of capacitor C5. The first amplifier module amplifies the light intensity electrical signal input1.

[0022] The comparison voltage supply module includes resistors R8 and R10. A DC power source VCC is connected to the first terminal of resistor R8. The second terminal of resistor R8 is grounded via resistor R9. The second terminal of resistor R8 serves as the output terminal of the comparison voltage supply module. The DC power source VCC is 5V, and the second terminal of resistor R8 provides the comparison voltage for comparator U2.

[0023] The comparison module includes: comparator U2, resistor R9, and resistor R11. The first end of resistor R9 is the non-inverting input of the comparison module, which is connected to the non-inverting input of comparator U2. The inverting input of comparator U2 is the inverting input of the comparison module. The inverting input of comparator U2 is connected to one end of resistor R11. The other end of resistor R11 is connected to the output of comparator U2, which is the output of the comparison module. Resistor R11 has a voltage stabilization function.

[0024] The second amplification module includes: an amplifier U3, a resistor R12, and a resistor R13. The input of amplifier U3 serves as the input of the second amplification module. The output of amplifier U3 is connected to the first end of resistor R12 and the first end of resistor R13. The second end of resistor R12 serves as the output of the second amplification module, and the second end of resistor R13 is grounded. Because the output voltage of comparator U2 is relatively low, it is very easy for the second controllable switch unit to have difficulty closing. Therefore, amplifier U3 is used to ensure that when the comparator U2 outputs a high level, it is sufficient to drive the second controllable switch unit to close.

[0025] The second controllable switch unit includes a switching transistor Q1, and a switching power supply unit includes a resistor R14. The first end of resistor R14 is connected to the DC power supply "power," the second end of resistor R14 is connected to one end of the coil, and the other end of the coil is connected to the collector of switching transistor Q1. The base of switching transistor Q1 serves as the control terminal of the second controllable switch unit, and the emitter of the second controllable switch unit is grounded. The DC power supply "power" is 12V. Switching transistor Q1 controls whether the coil is energized, thereby controlling whether resistor R2 is switched on when the switch actuator is relay RL1. The voltage value of resistor R1 is different from the voltage value of resistor R2.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. The signal processing circuit of the vegetation growth intelligent monitoring system is characterized by: include: a first amplifying module, an adjustable gain module, a comparison voltage providing module, a comparison module, and a second amplifying module; The input end of the first amplifying module is connected to the light intensity electrical signal to be processed, the first gain end of the first amplifying module is connected to the first end of the adjustable gain module, and the second end of the adjustable gain module is connected to the second gain end of the first amplifying module; The non-inverting input terminal of the comparison module is connected to the light intensity electrical signal to be processed, the inverting input terminal of the comparison module is connected to the output terminal of the comparison voltage providing module, and the output terminal of the comparison module is connected to the input terminal of the second amplification module; The adjustable gain module includes: a gain resistor unit, a first controllable switch unit, a second controllable switch unit and a switch power supply unit. The first controllable switch unit includes: a switch execution unit and a coil unit. The switch execution unit is arranged in the gain resistor unit. The gain resistor unit is provided with a first end and a second end. The switch execution unit is used to adjust the resistance value between the first end and the second end of the gain resistor unit according to whether the coil unit is energized. The switch power supply unit is used to power the coil unit through the second controllable switch unit. The control end of the second controllable switch unit is connected to the output end of the second amplification module.

2. The signal processing circuit of the vegetation growth intelligent monitoring system according to claim 1, characterized in that: The switch execution part is a single-pole double-throw switch, and the gain resistor unit includes: a resistor R1 and a resistor R2. The fixed end of the single-pole double-throw switch is the first end of the gain resistor unit, the first active end of the single-pole double-throw switch is connected to the first end of the resistor R1, the second active end of the single-pole double-throw switch is connected to the first end of the resistor R2, and the second end of the resistor R1 and the second end of the resistor R2 are connected to form the second end of the gain resistor unit.

3. The signal processing circuit of the vegetation growth intelligent monitoring system according to claim 2, characterized in that: The first amplifier module includes: resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, sliding resistor RV1, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5 and amplifier chip U1, the DC power supply VCC is connected to the first end of resistor R3 through resistor R6, the first end of resistor R3 is the input end of the first amplifier module, resistor R3 is connected to the non-inverting input end of the amplifier chip U1, the DC power supply VCC is connected to the first fixed end of the sliding resistor RV1 and the sliding end of the sliding resistor RV1 through resistor R5, the second fixed end of the sliding resistor RV1 is grounded, the sliding end of the sliding resistor RV1 is connected to the inverting input end of the amplifier chip U1 through resistor R4, and the DC power supply VCC is connected to the first fixed end of the sliding resistor RV1 and the sliding end of the sliding resistor RV1 through resistor R5. The source VCC supplies power to the power supply end of the amplifier chip U1, the positive pole of the capacitor C1 is connected to the power supply end of the amplifier chip U1, the negative pole of the capacitor C1, the negative pole of the capacitor C2, the negative pole of the capacitor C4 and the negative pole of the capacitor C5 are all grounded, the positive pole of the capacitor C2 and the positive pole of the capacitor C3 are both connected to the non-inverting input end of the amplifier chip U1, the inverting input end of the amplifier chip U1 is connected to the negative pole of the capacitor C3 and the positive pole of the capacitor C4, the eighth pin of the amplifier chip U1 is the first gain end of the first amplifier module, the first pin of the amplifier chip U1 is the second gain end of the first amplifier module, the output end of the amplifier chip U1 is connected to the first end of the resistor R7, the second end of the resistor R7 is the output end of the first amplifier module, and the second end of the resistor R7 is connected to the positive pole of the capacitor C5.

4. The signal processing circuit of the vegetation growth intelligent monitoring system according to any one of claims 1 to 3, characterized in that: The comparison voltage providing module includes: resistors R8 and R10. The DC power supply VCC is connected to the first end of the resistor R8. The second end of the resistor R8 is grounded through the resistor R9. The second end of the resistor R8 is the output end of the comparison voltage providing module.

5. The signal processing circuit of the vegetation growth intelligent monitoring system according to claim 4, characterized in that: The comparison module includes: a comparator U2, a resistor R9 and a resistor R11. The first end of the resistor R9 is the non-inverting input end of the comparison module, the resistor R9 is connected to the non-inverting input end of the comparator U2, the inverting input end of the comparator U2 is the inverting input end of the comparison module, the inverting input end of the comparator U2 is connected to one end of the resistor R11, the other end of the resistor R11 is connected to the output end of the comparator U2, and the output end of the comparator U2 is the output end of the comparison module.

6. The signal processing circuit of the vegetation growth intelligent monitoring system according to claim 5, characterized in that: The second amplifying module includes: an amplifier U3, a resistor R12 and a resistor R13. The input end of the amplifier U3 is the input end of the second amplifying module. The output end of the amplifier U3 is connected to the first end of the resistor R12 and the first end of the resistor R13. The second end of the resistor R12 is the output end of the second amplifying module. The second end of the resistor R13 is grounded.

7. The signal processing circuit of the vegetation growth intelligent monitoring system according to claim 6, characterized in that: The second controllable switch unit includes: a switching transistor Q1, and the switching power supply unit includes: a resistor R14, a first end of the resistor R14 is connected to a DC power supply power, a second end of the resistor R14 is connected to one end of the coil part, and the other end of the coil part is connected to the collector of the switching transistor Q1, the base of the switching transistor Q1 is the control end of the second controllable switch unit, and the emitter of the second controllable switch unit is grounded.

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