Multi-light-control closed-loop acquisition control circuit

Abstract

The utility model belongs to the field of light-operated signal control, and particularly relates to a multi-light-operated closed-loop acquisition control circuit. Comprising an operational amplifier circuit, a first multi-way switch and a transmitting tube circuit which are connected in sequence, and further comprises a receiving tube circuit and a second multi-way switch which are connected in sequence, and the input end of the operational amplifier circuit and the output end of the second multi-way switch are connected with the output end and the input end of a single chip microcomputer respectively. The utility model aims to provide a multi-light-control closed-loop acquisition control circuit, which is used for feeding back system output, adjusting and controlling a system, acquiring multi-light-control signals, comparing state quantities, controlling errors and correcting the errors by introducing a feedback mechanism, and improving the accuracy and the stability of system operation. The method is mainly used for optimal control of multiple light control signals of each module of financial system banknote detection equipment.

Description

Technical Field

[0001] The utility model belongs to the field of light-controlled signal control, in particular to a multi-light-controlled closed-loop acquisition control circuit. Background Art

[0002] At present, many automated equipment have a large number of optical control signals, especially the various functional modules of banknote detection in the financial system. The different positions of the optical control, the interference of factors such as dust accumulation during the use of the equipment, and the attenuation of the optical control components over time will complicate data control in all aspects of design and use, making it more likely to deviate from the preset ideal state of the optical control signal and cause failures, reducing the accuracy and stability of the system. Utility Model Content

[0003] The purpose of the utility model is to provide a multi-light control closed-loop acquisition control circuit, which introduces a feedback mechanism to feed back the system output, adjust and control the system, collect the multi-light control signals and compare the state quantity, control the error and make corrections, and improve the accuracy and stability of the system operation. It is mainly used for the optimization control of the multi-light control signals of each module of the banknote detection equipment of the financial system.

[0004] The technical solution adopted by the utility model to achieve the above-mentioned purpose is:

[0005] A multi-light-controlled closed-loop acquisition control circuit includes: an operational amplifier circuit, a first multi-way switch, and a transmitting tube circuit connected in sequence, and also includes a receiving tube circuit and a second multi-way switch connected in sequence. The input end of the operational amplifier circuit and the output end of the second multi-way switch are respectively connected to the output end and input end of a single-chip microcomputer.

[0006] The operational amplifier circuit includes an operational amplifier U1A, resistors R7, R9, R10 and a capacitor C1, wherein:

[0007] The input end of the operational amplifier circuit is connected to the non-inverting input end of the operational amplifier U1A through a resistor R7, the inverting input end of the operational amplifier U1A is grounded through a resistor R9, the inverting input end of the operational amplifier U1A is also connected to the output end of the operational amplifier U1A through a resistor R10, the positive power supply of the operational amplifier U1A is grounded through a capacitor C1, and the output end of the operational amplifier U1A serves as the output end of the operational amplifier circuit.

[0008] The first multi-way switch is a single-ended 8-channel multi-way switch.

[0009] The second multi-way switch is a single-ended 8-channel multi-way switch.

[0010] The transmitting tube circuit includes an operational amplifier U7A, a current limiting resistor R11, capacitors C2, C4, a transistor T1 and a transmitting tube GK_F1, wherein:

[0011] The non-inverting input terminal of the operational amplifier U7A serves as the input terminal of the transmitting tube circuit and is grounded through the capacitor C4. The inverting input terminal of the operational amplifier U7A is grounded through the current limiting resistor R11. The output terminal of the operational amplifier U7A is connected to the base of the transistor T1. The positive pole of the power supply of the operational amplifier U7A is grounded through the capacitor C2. The emitter of the transistor T1 is grounded through the current limiting resistor R11. The power supply VCC is connected to the collector of the transistor T1 through the transmitting tube GK_F1. The transmitting tube GK_F1 serves as the output terminal of the transmitting tube circuit.

[0012] The receiving tube circuit includes a receiving tube GK_S1 and a current limiting resistor R24, wherein:

[0013] The base of the receiving tube GK_S1 serves as the input end of the receiving tube circuit to receive the light emitted by the transmitting tube. The emitter of the receiving tube GK_S1 is grounded, and the collector of the receiving tube GK_S1 is connected to the 3.3V power supply through the current limiting resistor R24. The node between the collector of the receiving tube GK_S1 and the current limiting resistor R24 ​​is the output end of the receiving tube circuit.

[0014] A resistor R37 is also connected between the second multi-way switch and the single motor.

[0015] The utility model has the following beneficial effects and advantages:

[0016] 1. The utility model adopts the above technical solution to provide a multi-light-controlled closed-loop acquisition control circuit. During the operation of the circuit structure, the light-controlled tubes (pairs of tubes) are controlled through closed-loop acquisition, which greatly improves the control accuracy of the light-controlled tubes.

[0017] 2. The utility model can achieve the goal of multiple groups of light control feedback control, which not only solves the problem of accurate light control, but also solves the problem of simultaneous adjustment of multiple light controls.

[0018] 3. Due to its simple structure and low cost, it is suitable for production and wide promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Multi-way switch gating circuit diagram;

[0020] Figure 2 Single group of light control tube (transmitter + receiver) closed loop acquisition control circuit diagram;

[0021] Figure 3 The closed-loop acquisition control circuit diagram of 8 groups of photoelectric control tubes selected by a multi-way switch. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] The utility model is a multi-light-controlled closed-loop acquisition control circuit, which uses two multi-way switches to respectively select the signals of a corresponding group of transmitting tubes and receiving tubes. When each group of transmitting tubes and receiving tubes is selected, the receiving signal is fed back and input to the single-chip microcomputer, and then the intensity of the transmitting tube is adjusted through the output of the single-chip microcomputer to realize the closed-loop control of multiple light-controlled tubes. The designed circuit can adjust multiple groups of light-controlled tubes on the equipment, and each group of light-controlled tubes can realize closed-loop acquisition control. This circuit includes an analog signal output terminal DS0A of the single-chip microcomputer connected to the input end of the operational amplifier U1A through a resistor R7, the output end of the operational amplifier U1A is connected to the input end of the multi-way switch U2, and is connected to the input end of each transmitting tube operational amplifier circuit through the selection of the multi-way switch; the receiving signal end of each receiving tube is connected to the power supply through a resistor, and the receiving signal is connected to the input end of the multi-way switch U11. Through the selection of the multi-way switch U11, the receiving signal of the receiving tube is input into the analog signal input terminal AIN0A of the single-chip microcomputer. Taking the transmitting tube GK_F1 and the receiving tube GK_S1 as an example, the multiplexer U2 selects the signal 1DA000, and the multiplexer U11 selects the signal PHOS0S1. At this time, the corresponding closed-loop acquisition control circuit corresponds to the light control combination, namely the transmitting tube GK_F1 and the receiving tube GK_S1, that is, the selection of the closed-loop acquisition control of multiple light control tubes is performed through the multiplexer. The signal PHOS0S1 of the receiving tube is collected and connected to the analog signal input terminal AIN0A of the single-chip microcomputer through the multiplexer U11 to collect the signal to the single-chip microcomputer; the analog signal output terminal DS0A of the single-chip microcomputer is connected to the input terminal of the operational amplifier U1A through the resistor R7, and the output terminal of the operational amplifier U1A is connected to the input terminal of the transmitting tube operational amplifier circuit through the multiplexer U2. The PHOS0F1 signal is controlled by adjusting the amplification, and then the intensity of the transmitting tube is adjusted; the single-chip microcomputer adjusts DS0A according to the feedback of the received signal to realize the function of the light control closed-loop acquisition control, and the use of the multiplexer realizes the function of the multi-light control closed-loop acquisition control circuit.

[0024] This design circuit (see Figure 3 ) , DS0A is the analog signal output of the microcontroller (used to adjust the transmission), and AIN0A is the analog signal input of the microcontroller (used to collect the receiving tube signal). The circuit uses a single-ended 8-channel multiplexer 74HC4051 and a single-power dual-channel operational amplifier AD8532ARZ. This circuit structure includes but is not limited to the selection of Figure 3 The multi-way switch and operational amplifier in the embodiment may also use other chips according to actual usage. Figure 3 The 8 groups of light control tubes are transmitting tubes LN502 and receiving tubes 3DU21. Different current limiting resistors are matched according to the actual use environment to achieve the best design. The selection of transmitting tubes and receiving tubes includes but is not limited to this. Other light control tubes can also be used according to the actual use.

[0025] Figure 1The circuit shown is a multi-way switch gating circuit. DS0A is the analog signal output terminal of the single-chip microcomputer, and AIN0A is the analog signal input terminal of the single-chip microcomputer. Two single-ended 8-channel multi-way switches 74HC4051 are used in the circuit, of which U2 is responsible for gating the signal of the transmitting tube, and U11 is responsible for gating the signal of the receiving tube. The gating state of the two multi-way switches is controlled by the single-chip microcomputer, so that the multi-way switches gating the same group of light-controlled tubes in the same period of time, that is, the multi-way switches gating X0 or others (X1, X2, X3, X4, X5, X6, X7) at the same time, at this time, the selected group of light-controlled tubes can be feedback-regulated. The single-chip microcomputer cyclically selects the multi-way switch, and feedback-regulated all light-controlled tubes in the circuit.

[0026] Figure 2 The circuit shown is a closed-loop acquisition control circuit for a single group of light control. The light control pair of tubes is the transmitting tube GK_F1 and the receiving tube GK_S1, the transmitting tube current limiting resistor R11, and the receiving tube current limiting resistor R24. The receiving tube signal PHOS0S1 is sent to the analog signal input terminal AIN0A of the microcontroller through the multi-way switch to complete the acquisition of the receiving tube signal to the microcontroller. The microcontroller receives the feedback of the received signal through Figure 1 The analog signal output terminal DS0A is output and connected to the input terminal of the operational amplifier U1A through the resistor R7. The output terminal of the operational amplifier U1A is connected to the input terminal of the operational amplifier U1A through the multi-way switch U2. Figure 2 The input end 1DA000 of the transmitting tube operational amplifier circuit controls the PHOS0F1 signal through the operational amplifier adjustment and amplification, thereby adjusting the intensity of the transmitting tube, and finally realizing the function of light-controlled closed-loop acquisition control.

Claims

1. A multi-light-controlled closed-loop acquisition control circuit, characterized in that: include: An operational amplifier circuit, a first multi-way switch, and a transmitting tube circuit connected in sequence, and also includes a receiving tube circuit and a second multi-way switch connected in sequence, wherein the input end of the operational amplifier circuit and the output end of the second multi-way switch are respectively connected to the output end and the input end of the single-chip microcomputer; The transmitting tube circuit includes an operational amplifier U7A, a current limiting resistor R11, capacitors C2, C4, a transistor T1 and a transmitting tube GK_F1, wherein: The non-inverting input terminal of the operational amplifier U7A serves as the input terminal of the transmitting tube circuit and is grounded through the capacitor C4. The inverting input terminal of the operational amplifier U7A is grounded through the current limiting resistor R11. The output terminal of the operational amplifier U7A is connected to the base of the transistor T1. The positive pole of the power supply of the operational amplifier U7A is grounded through the capacitor C2. The emitter of the transistor T1 is grounded through the current limiting resistor R11. The power supply VCC is connected to the collector of the transistor T1 through the transmitting tube GK_F1. The transmitting tube GK_F1 serves as the output terminal of the transmitting tube circuit.

2. The multi-light-controlled closed-loop acquisition control circuit according to claim 1, characterized in that: The operational amplifier circuit includes an operational amplifier U1A, resistors R7, R9, R10 and a capacitor C1, wherein: The input end of the operational amplifier circuit is connected to the non-inverting input end of the operational amplifier U1A through a resistor R7, the inverting input end of the operational amplifier U1A is grounded through a resistor R9, the inverting input end of the operational amplifier U1A is also connected to the output end of the operational amplifier U1A through a resistor R10, the positive power supply of the operational amplifier U1A is grounded through a capacitor C1, and the output end of the operational amplifier U1A serves as the output end of the operational amplifier circuit.

3. The multi-light-controlled closed-loop acquisition control circuit according to claim 1, characterized in that: The first multi-way switch is a single-ended 8-channel multi-way switch.

4. The multi-light-controlled closed-loop acquisition control circuit according to claim 1, characterized in that: The second multi-way switch is a single-ended 8-channel multi-way switch.

5. The multi-light-controlled closed-loop acquisition control circuit according to claim 1, characterized in that: The receiving tube circuit includes a receiving tube GK_S1 and a current limiting resistor R24, wherein: The base of the receiving tube GK_S1 serves as the input end of the receiving tube circuit to receive the light emitted by the transmitting tube. The emitter of the receiving tube GK_S1 is grounded, and the collector of the receiving tube GK_S1 is connected to the 3.3V power supply through the current limiting resistor R24. The node between the collector of the receiving tube GK_S1 and the current limiting resistor R24 ​​is the output end of the receiving tube circuit.

6. The multi-light-controlled closed-loop acquisition control circuit according to claim 1, characterized in that: A resistor R37 is also connected between the second multi-way switch and the single motor.

Images