Integrated multi-sensor detection circuit

Abstract

The utility model provides an integrated multi-sensor detection circuit, which comprises a sensor interface, a power supply interface, a step-down circuit, an MCU circuit, an LED drive circuit and an operational amplifier circuit, the sensor interface is connected with the LED drive circuit and the operational amplifier circuit, the LED drive circuit and the operational amplifier circuit are connected with the MCU circuit, and a USART screen interface is connected with the MCU circuit. The USART screen interface is connected with an external feedback screen, the LED drive circuit is adopted to output 49mA in a constant current mode, PWM dimming is conducted at the same time, the operational amplifier circuit is used for amplifying output signals of the sensor interface through an operational amplifier, the output signals are sent to the MCU circuit to be processed and controlled, low distortion is achieved through a resistor R2 and a capacitor C8, the ADC noise amount is reduced, and the signal collection precision is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electricity, and more specifically, to an integrated multi-sensor detection circuit. Background Art

[0002] As a monitoring device, sensors are widely used in machinery, ships, rail transportation and other fields. A circuit board is installed inside the sensor housing. The sensitive elements on the circuit board detect physical quantities such as vibration, impact and temperature signals at the measured position and convert them into electrical signals.

[0003] Most existing sensor detection circuits directly connect the sensor interface to the microcontroller, which is unable to detect tiny signals and poses a risk of missed detection.

[0004] In view of this, the utility model proposes an integrated multi-sensor detection circuit with simple structure and high-precision acquisition and detection. Utility Model Content

[0005] The utility model provides an integrated multi-sensor detection circuit with simple structure and high-precision collection and detection.

[0006] An integrated multi-sensor detection circuit includes a sensor interface, a power supply interface, a step-down circuit, an MCU circuit, an LED driver circuit, an operational amplifier circuit, and a USART screen interface. The circuit is characterized in that: the power supply interface is used to provide a 5V power supply for the step-down circuit, the MCU circuit, the LED driver circuit, and the operational amplifier circuit; the step-down circuit is used to convert the 5V power supply into a 3V3 power supply; the sensor interface is connected to the LED driver circuit and the operational amplifier circuit; the LED driver circuit and the operational amplifier circuit are connected to the MCU circuit; the USART screen interface is connected to the MCU circuit; the USART screen interface is connected to the peripheral feedback screen; the LED driver circuit is used to output a constant current of 49mA and simultaneously perform PWM dimming; the operational amplifier circuit is used to amplify the output signal of the sensor interface using an operational amplifier; and the output signal is sent to the MCU circuit for processing and control.

[0007] Furthermore, the operational amplifier circuit includes an operational amplifier U5, a resistor R7, a capacitor C1, a resistor R2, a resistor R10, a resistor U6, and a capacitor C8. The OUTPUT5 pin of the sensor interface is connected to the 1st pin of the operational amplifier U5 through the resistor U4. A resistor R7 is provided between the resistor U4 and the 1st pin of the operational amplifier U5. The 5th pin of the operational amplifier U5 is grounded through the capacitor C1. The 4th pin of the operational amplifier U5 is connected to the 15th pin of the MCU chip U18 through the resistor R2. Resistors R10 and U6 are provided between the 4th pin of the operational amplifier U5 and the 3rd pin of the operational amplifier U5. A capacitor C8 is provided between the resistor R2 and the 15th pin of the MCU chip U18. The resistor R7 is used to provide current shunt, which plays a role. It has the function of biasing or limiting current. Capacitor C1 is used for power decoupling, reducing the influence of power noise on the op amp and ensuring stable power supply. Resistor R2 is the output resistor, which plays the role of limiting the output current protection circuit. Capacitor C8 smoothes the output signal and reduces high-frequency noise or ripple interference. When the input signal is amplified by the operational amplifier U5, the following situations may exist: noise, high-frequency signal or distortion. Low noise is guaranteed within the broadband bandwidth, so that the SNR value is better. Resistor R2 and capacitor C8 limit the input signal bandwidth, reduce the ADC noise amount, and improve the acquisition accuracy. Resistor R10 and resistor U6 form a negative feedback network, which determines the gain of the op amp and plays the role of adjusting the gain of the op amp.

[0008] In some embodiments, the LED driving circuit includes an LED driver U7 and a resistor R11. Pin 5 of the LED driver U7 is connected to the LED5-pin of the sensor interface. A resistor R11 is connected between pin 5 of the LED driver U7 and the LED5-pin of the sensor interface. Pin 2 of pin 5 of the LED driver U7 is connected to pin 46 of the MCU chip U18. A resistor R12 is provided between pin 2 of pin 5 of the LED driver U7 and pin 46 of the MCU chip U18. When pin 46 of the MCU chip U18 is at a high level, the circuit is turned on, and pin 3 of the LED driver U7 is grounded through the inductor L4. The resistor R11 configures the resistance value and provides a constant current, and the resistor R12 acts as a pull-down.

[0009] In some embodiments, the step-down circuit includes a capacitor C11, a capacitor C12, and a step-down chip U3. The step-down chip U3 is used to step down 7-15V DC to 3.3V DC. One end of the capacitor C11 is connected to pin 1 of the interface H1, and the other end of the capacitor C11 is connected to the input end of the step-down chip U3. The capacitor C11 acts as a filter. The capacitor C12 is connected to the output end of the step-down chip, and the capacitor C12 acts as a filter.

[0010] In some embodiments, the MCU circuit is further connected with a first crystal oscillator circuit, which provides a high-frequency crystal oscillator, processes tasks and peripheral clock, the 5th pin of the MCU chip U18 is connected with one end of the first crystal oscillator circuit, and the 6th pin of the MCU chip U18 is connected with the other end of the first crystal oscillator circuit.

[0011] In some embodiments, the MCU circuit is further connected with a second crystal oscillator circuit, which provides a low-frequency crystal oscillator, maintains a real-time clock function in low-power consumption, the 3rd pin of the MCU chip U18 is connected with one end of the first crystal oscillator circuit, and the 4th pin of the MCU chip U18 is connected with the other end of the first crystal oscillator circuit.

[0012] In some embodiments, the MCU circuit is further connected with a reset circuit, which is composed of a resistor R21 and a capacitor C17.

[0013] In some embodiments, the step-down circuit is further connected with a power filter circuit, which includes a first power filter circuit and a second power filter circuit, the 5V end of the step-down circuit is connected with the first power filter circuit, and the 3V3 end of the step-down circuit is further connected with the second power filter circuit, the first power filter circuit and the second power filter circuit both filter high-frequency noise and reduce external interference.

[0014] In some embodiments, the MCU circuit is further connected with a serial communication interface, which is used for serial communication, download function and can replace the power supply interface to supply power, the 7th pin of the serial communication interface U19 is connected with the 30th pin of the MCU chip U18, and the 6th pin of the serial communication interface U19 is connected with the 31st pin of the MCU chip U18.

[0015] In some embodiments, the operational amplifier U5 is of the specification LM321G-AE5-R, the LED driver U7 is of the specification PAM2804AAB010, and the MCU chip U18 is of the specification STM32F103C8T6.

[0016] Beneficial effects of the present invention: The present invention proposes an integrated multi-sensor detection circuit, including a sensor interface, a power supply interface, a step-down circuit, an MCU circuit, an LED drive circuit, and an operational amplifier circuit. The power supply interface is used to provide a 5V power supply for the step-down circuit, the MCU circuit, the LED drive circuit, and the operational amplifier circuit. The step-down circuit is used to convert the 5V power supply into a 3V3 power supply. The sensor interface is connected to the LED drive circuit and the operational amplifier circuit. The LED drive circuit and the operational amplifier circuit are connected to the MCU circuit. The USART screen interface is connected to the MCU circuit. The USART screen interface is connected to the peripheral feedback screen. The LED drive circuit uses a constant current output of 49mA and PWM dimming at the same time. The operational amplifier circuit is used to use an operational amplifier to amplify the output signal of the sensor interface. The output signal is sent to the MCU circuit for processing and control. Low distortion is achieved through the resistor R2 and the capacitor C8, reducing the ADC noise and greatly improving the signal acquisition accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a circuit diagram of an operational amplifier circuit of an integrated multi-sensor detection circuit of the present application.

[0018] Figure 2 This is a circuit diagram of a step-down circuit of an integrated multi-sensor detection circuit of the present application.

[0019] Figure 3 This is a circuit diagram of a sensor interface and LED drive circuit of an integrated multi-sensor detection circuit of the present application.

[0020] Figure 4 This is a circuit diagram of an MCU circuit of an integrated multi-sensor detection circuit of the present application.

[0021] Figure 5 This is a circuit diagram of a first crystal oscillator circuit and a second crystal oscillator circuit of an integrated multi-sensor detection circuit of the present application.

[0022] Figure 6 This is a circuit diagram of a power supply filter circuit of an integrated multi-sensor detection circuit of the present application.

[0023] Figure 7 This is a circuit diagram of a reset circuit of an integrated multi-sensor detection circuit of the present application.

[0024] Figure 8 This is a circuit diagram of the serial communication interface and USART screen interface of an integrated multi-sensor detection circuit of the present application.

[0025] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0026] The following examples are described to assist in understanding the present application, and the examples are not and should not be interpreted in any way as limiting the scope of protection of the present application.

[0027] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as separate functional units (which may include sub-units), but those skilled in the art will recognize that various components or portions thereof may be divided into separate components or may be integrated together (including within a single system or component).

[0028] At the same time, the connections between components or systems are not intended to be limited to direct connections. Instead, data between these components may be modified, reformatted, or otherwise changed by intermediate components. In addition, additional or fewer connections may be used. It should also be noted that the terms "coupled," "connected," or "input" should be understood to include direct connections, indirect connections through one or more intermediate devices, and wireless connections.

[0029] Example 1:

[0030] like Figure 4 As shown, it is a circuit diagram of the MCU circuit. The specification of the MCU chip U18 is STM32F103C8T6, the specification of the operational amplifier U5 is LM321G-AE5-R, and the specification of the LED driver U7 is PAM2804AAB010. An integrated multi-sensor detection circuit includes a sensor interface, a power supply interface, a step-down circuit, an MCU circuit, an LED drive circuit, an operational amplifier circuit, and a USART screen interface. It is characterized in that: the power supply interface is used to provide a 5V power supply for the step-down circuit, the MCU circuit, the LED drive circuit, and the operational amplifier circuit; the step-down circuit is used to convert the 5V power supply into a 3V3 power supply; the sensor interface is connected to the LED drive circuit and the operational amplifier circuit; the LED drive circuit and the operational amplifier circuit are connected to the MCU circuit. Figure 8 As shown in the figure, it is the circuit diagram of the USART screen interface. The USART screen interface is connected to the MCU circuit, and the USART screen interface is connected to the peripheral feedback screen. The LED drive circuit is used to output a constant current of 49mA and perform PWM dimming at the same time. The operational amplifier circuit is used to amplify the output signal of the sensor interface using an operational amplifier, and the output signal is sent to the MCU circuit for processing and control.

[0031] like Figure 1The circuit diagram of the operational amplifier circuit shown in the figure includes an operational amplifier U5, a resistor R7, a capacitor C1, a resistor R2, a resistor R10, a resistor U6, and a capacitor C8. The OUTPUT5 pin of the sensor interface is connected to the 1st pin of the operational amplifier U5 through the resistor U4. A resistor R7 is provided between the resistor U4 and the 1st pin of the operational amplifier U5. The 5th pin of the operational amplifier U5 is grounded through the capacitor C1. The 4th pin of the operational amplifier U5 is connected to the 15th pin of the MCU chip U18 through the resistor R2. Resistors R10 and U6 are provided in sequence between the 4th pin of the operational amplifier U5 and the 3rd pin of the operational amplifier U5. A capacitor C8 is provided between the resistor R2 and the 15th pin of the MCU chip U18. The resistor R7 is used to provide current Shunt, play the role of bias or limiting current, capacitor C1 is used for power supply decoupling, reduce the impact of power supply noise on the op amp, and ensure stable power supply, resistor R2 is the output resistor, play the role of limiting the output current protection circuit, capacitor C8 plays the role of smoothing the output signal, reducing high-frequency noise or ripple interference, when the input signal is amplified by the operational amplifier U5, there will be the following situations: noise, high-frequency signal or distortion, low noise is guaranteed within the broadband bandwidth, so that the SNR value is better, resistor R2 and capacitor C8 limit the input signal bandwidth, reduce the ADC noise amount, and improve the acquisition accuracy, resistor R10 and resistor U6 form a negative feedback network, which determines the gain of the op amp and plays the role of adjusting the gain of the op amp.

[0032] like Figure 3 As shown in the figure, it is a circuit diagram of the sensor interface and LED driving circuit. The LED driving circuit includes an LED driver U7 and a resistor R11. Pin 5 of the LED driver U7 is connected to the LED5-pin of the sensor interface. Resistor R11 is connected between pin 5 of the LED driver U7 and the LED5-pin of the sensor interface. Pin 2 of pin 5 of the LED driver U7 is connected to pin 46 of the MCU chip U18. Resistor R12 is provided between pin 2 of pin 5 of the LED driver U7 and pin 46 of the MCU chip U18. When pin 46 of the MCU chip U18 is at a high level, the circuit is turned on, and pin 3 of the LED driver U7 is grounded through the inductor L4. Resistor R11 configures the resistance value and provides a constant current, and resistor R12 acts as a pull-down.

[0033] like Figure 2 The circuit diagram of the step-down circuit shown in the figure includes a capacitor C11, a capacitor C12, and a step-down chip U3. The step-down chip U3 is used to step down 7-15V DC to 3.3V DC. One end of the capacitor C11 is connected to pin 1 of the interface H1, and the other end of the capacitor C11 is connected to the input end of the step-down chip U3. The capacitor C11 plays a filtering role. The capacitor C12 is connected to the output end of the step-down chip and plays a filtering role.

[0034] like Figure 5 As shown, it is a circuit diagram of the first crystal oscillator circuit and the second crystal oscillator circuit. The MCU circuit is also connected to the first crystal oscillator circuit. The first crystal oscillator circuit provides a high-frequency crystal oscillator to process tasks and peripheral clocks. Pin 5 of the MCU chip U18 is connected to one end of the first crystal oscillator circuit, and pin 6 of the MCU chip U18 is connected to the other end of the first crystal oscillator circuit.

[0035] The MCU circuit is also connected to a second crystal oscillator circuit, which provides a low-frequency crystal oscillator to maintain the real-time clock function at low power consumption. Pin 3 of the MCU chip U18 is connected to one end of the first crystal oscillator circuit, and pin 4 of the MCU chip U18 is connected to the other end of the first crystal oscillator circuit.

[0036] like Figure 7 , which is a circuit diagram of a reset circuit. The MCU circuit is further connected to a reset circuit, which is composed of a resistor R21 and a capacitor C17.

[0037] like Figure 6 As shown in the figure, it is a circuit diagram of the power supply filter circuit. The step-down circuit is also connected to the power supply filter circuit. The power supply filter circuit includes a first power supply filter circuit and a second power supply filter circuit. The 5V end of the step-down circuit is connected to the first power supply filter circuit, and the 3V3 end of the step-down circuit is also connected to the second power supply filter circuit. The first power supply filter circuit and the second power supply filter circuit both play the role of filtering out high-frequency noise and reducing external interference.

[0038] like Figure 8 As shown, it is a serial communication interface and US. The MCU circuit is also connected to a serial communication interface. The serial communication interface is used for serial communication and download functions and can replace the power supply interface for power supply. Pin 7 of the serial communication interface U19 is connected to pin 30 of the MCU chip U18, and pin 6 of the serial communication interface U19 is connected to pin 31 of the MCU chip U18.

[0039] The utility model discloses an integrated multi-sensor detection circuit, including sensor interface, power supply interface, voltage reducing circuit, MCU circuit, LED drive circuit, operational amplifier circuit, power supply interface is used to provide 5V power supply for voltage reducing circuit, MCU circuit, LED drive circuit, operational amplifier circuit, voltage reducing circuit is used to convert 5V power supply into 3V3 power supply, sensor interface is connected with LED drive circuit, operational amplifier circuit, LED drive circuit, operational amplifier circuit connection is connected with MCU circuit, USART screen interface is connected with MCU circuit, USART screen interface is connected with peripheral feedback screen, adopts LED drive circuit constant -current output 49mA while PWM light modulation, operational amplifier circuit is used for using operational amplifier to amplify sensor interface output signal, and output signal is sent to MCU circuit and is handled control, and realizes low distortion through resistance R2 and capacitor C8, reduces ADC noise amount, and greatly improves signal acquisition accuracy.

[0040] Although several aspects and embodiments have been disclosed, other aspects and embodiments will be apparent to those skilled in the art in view of this disclosure, and can be made without departing from the spirit of the application.

Claims

1. An integrated multi-sensor detection circuit, including a sensor interface, a power supply interface, a step-down circuit, an MCU circuit, an LED drive circuit, an operational amplifier circuit, and a USART screen interface, characterized in that: The power supply interface is used to provide 5V power supply for the step-down circuit, MCU circuit, LED drive circuit, and operational amplifier circuit. The step-down circuit is used to convert the 5V power supply into a 3V3 power supply. The sensor interface is connected to the LED drive circuit and the operational amplifier circuit. The LED drive circuit and the operational amplifier circuit are connected to the MCU circuit. The USART screen interface is connected to the MCU circuit. The USART screen interface is connected to the peripheral feedback screen. The LED drive circuit is used to output a constant current of 49mA and perform PWM dimming at the same time. The operational amplifier circuit is used to use an operational amplifier to amplify the output signal of the sensor interface, and the output signal is sent to the MCU circuit for processing and control.

2. The integrated multi-sensor detection circuit according to claim 1, wherein: The operational amplifier circuit includes an operational amplifier U5, a resistor R7, a capacitor C1, a resistor R2, a resistor R10, a resistor U6, and a capacitor C8. The OUTPUT5 pin of the sensor interface is connected to the 1st pin of the operational amplifier U5 through the resistor U4. A resistor R7 is provided between the resistor U4 and the 1st pin of the operational amplifier U5. The 5th pin of the operational amplifier U5 is grounded through the capacitor C1. The 4th pin of the operational amplifier U5 is connected to the 15th pin of the MCU chip U18 through the resistor R2. The resistor R10 and the resistor U6 are provided in sequence between the 4th pin of the operational amplifier U5 and the 3rd pin of the operational amplifier U5. The resistor R2 is connected to the MCU chip U18. A capacitor C8 is provided between pin 15 of chip U18. Resistor R7 is used to provide current shunt, which plays a role of biasing or limiting current. Capacitor C1 is used for power supply decoupling to reduce the impact of power supply noise on the op amp and ensure stable power supply. Resistor R2 is the output resistor, which plays a role of limiting the output current protection circuit. Capacitor C8 plays a role of smoothing the output signal and reducing high-frequency noise or ripple interference. Resistor R2 and capacitor C8 limit the input signal bandwidth, reduce the ADC noise amount, and improve the acquisition accuracy. Resistor R10 and resistor U6 constitute a negative feedback network, which determines the gain of the op amp and plays a role of adjusting the gain of the op amp.

3. The integrated multi-sensor detection circuit according to claim 2, wherein: The LED driving circuit includes an LED driver U7 and a resistor R11. Pin 5 of the LED driver U7 is connected to the LED5-pin of the sensor interface. A resistor R11 is connected between pin 5 of the LED driver U7 and the LED5-pin of the sensor interface. Pin 2 of pin 5 of the LED driver U7 is connected to pin 46 of the MCU chip U18. A resistor R12 is provided between pin 2 of pin 5 of the LED driver U7 and pin 46 of the MCU chip U18. When pin 46 of the MCU chip U18 is at a high level, the circuit is turned on, and pin 3 of the LED driver U7 is grounded through the inductor L4. The resistor R11 configures the resistance value and provides a constant current, and the resistor R12 acts as a pull-down.

4. The integrated multi-sensor detection circuit according to claim 1, wherein: The step-down circuit includes a capacitor C11, a capacitor C12, and a step-down chip U3. The step-down chip U3 is used to step down 7-15V DC to 3.3V DC. One end of the capacitor C11 is connected to pin 1 of the interface H1, and the other end of the capacitor C11 is connected to the input end of the step-down chip U3. The capacitor C11 plays a filtering role. The capacitor C12 is connected to the output end of the step-down chip and plays a filtering role.

5. The integrated multi-sensor detection circuit according to claim 2, wherein: The MCU circuit is also connected to a first crystal oscillator circuit, which provides a high-frequency crystal oscillator to process tasks and peripheral clocks. Pin 5 of the MCU chip U18 is connected to one end of the first crystal oscillator circuit, and pin 6 of the MCU chip U18 is connected to the other end of the first crystal oscillator circuit.

6. The integrated multi-sensor detection circuit according to claim 2, wherein: The MCU circuit is also connected to a second crystal oscillator circuit, which provides a low-frequency crystal oscillator to maintain the real-time clock function at low power consumption. Pin 3 of the MCU chip U18 is connected to one end of the first crystal oscillator circuit, and pin 4 of the MCU chip U18 is connected to the other end of the first crystal oscillator circuit.

7. The integrated multi-sensor detection circuit according to claim 1, wherein: The MCU circuit is also connected to a reset circuit, which is composed of a resistor R21 and a capacitor C17.

8. The integrated multi-sensor detection circuit according to claim 1, wherein: The step-down circuit is also connected to a power supply filter circuit, which includes a first power supply filter circuit and a second power supply filter circuit. The 5V end of the step-down circuit is connected to the first power supply filter circuit, and the 3V3 end of the step-down circuit is also connected to the second power supply filter circuit. The first power supply filter circuit and the second power supply filter circuit both play a role in filtering out high-frequency noise and reducing external interference.

9. The integrated multi-sensor detection circuit according to claim 1, wherein: The MCU circuit is also connected to a serial communication interface, which is used for serial communication and download functions and can replace the power supply interface for power supply. Pin 7 of the serial communication interface U19 is connected to pin 30 of the MCU chip U18, and pin 6 of the serial communication interface U19 is connected to pin 31 of the MCU chip U18.

10. The integrated multi-sensor detection circuit according to claim 3, wherein: The specifications of the operational amplifier U5 are LM321G-AE5-R, the specifications of the LED driver U7 are PAM2804AAB010, and the specifications of the MCU chip U18 are STM32F103C8T6.

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