Delta-Sigma ADC data reading device

Abstract

The utility model relates to the technical field of digital-to-analog conversion, and discloses a Delta-Sigma ADC data reading device, which comprises a power supply circuit, a photoelectric conversion circuit and a minimum system unit, one end of the power supply circuit is connected with an external direct-current power supply, and the other end of the power supply circuit is connected with the power supply end of the photoelectric conversion circuit and the power supply end of the minimum system unit; one end of the photoelectric conversion circuit is connected with an optical signal input end, and the other end of the photoelectric conversion circuit is connected with a signal end of the minimum system unit. According to the utility model, the minimum system unit with the built-in digital filter is adopted to replace a bit stream data conversion chip in the traditional scheme, so that the cost is reduced, and the area of a printed circuit board is saved; and the data interaction process between the active filter chip and the MCU is omitted, and the information transmission efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of digital-analog conversion, in particular to a Delta-Sigma ADC data reading device. Background Art

[0002] Sigma-Delta ADC is the most commonly used high-precision ADC structure. It is a must-have structure when the accuracy reaches more than 20 bits. By adopting oversampling, noise shaping and digital filtering technology, the design requirements for analog circuits are reduced, achieving high precision and low power consumption that other types of ADCs cannot achieve.

[0003] However, the bit stream data of the existing Delta-Sigma ADC is usually read by the active filter chip first, and then forwarded to the back-end MCU chip through serial communication such as SPI, which results in low information transmission efficiency and relatively high cost. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a Delta-Sigma ADC data reading device.

[0005] In order to achieve the above utility model purpose, the technical solution adopted by the utility model is:

[0006] A Delta-Sigma ADC data reading device comprises a power supply circuit, a photoelectric conversion circuit and a minimum system unit; one end of the power supply circuit is connected to an external direct current power supply, and one end of the power supply circuit is respectively connected to a power supply end of the photoelectric conversion circuit and a power supply end of the minimum system unit; one end of the photoelectric conversion circuit is connected to an optical signal input end, and the other end of the photoelectric conversion circuit is connected to a signal end of the minimum system unit.

[0007] Preferably, the power supply circuit includes a 5V voltage conversion circuit and a 3.3V voltage conversion circuit;

[0008] The 5V voltage conversion circuit includes a URB2405S power module, wherein pin 1 of the URB2405S power module is connected to the negative electrode of the external DC power supply, pin 2 of the URB2405S power module is connected to the positive electrode of the external DC power supply via a third diode, and a second diode and a tenth capacitor are respectively connected in parallel between pin 1 and pin 2 of the URB2405S power module; pin 6 of the URB2405S power module is connected to the 5V voltage terminal, pin 7 of the URB2405S power module is grounded, and pin 6 and pin 7 of the URB2405S power module are respectively connected in parallel with an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor and a fourth diode;

[0009] The 3.3V voltage conversion circuit includes an LM1085ISX voltage regulator, wherein pin 4 of the LM1085ISX voltage regulator is connected to pin 2, pin 3 of the LM1085ISX voltage regulator is connected to a 5V voltage terminal and is grounded via a sixteenth capacitor and a seventeenth capacitor connected in parallel, pin 2 of the LM1085ISX voltage regulator is connected to a 3.3V voltage terminal and is grounded via an eighteenth capacitor and a nineteenth capacitor connected in parallel, and pin 1 of the LM1085ISX voltage regulator is grounded.

[0010] Preferably, the power supply circuit further includes an external power supply circuit;

[0011] The external power supply circuit includes a URA2424YMD power module, pin 2 of the URA2424YMD power module is connected to the positive electrode of the external DC power supply through a first diode and a first fuse, pin 1 of the URA2424YMD power module is connected to the negative electrode of the external DC power supply, and the sixth capacitor and the seventh capacitor are respectively connected in parallel between pin 1 and pin 2 of the URA2424YMD power module, pin 3 of the URA2424YMD power module is connected to the positive electrode of the 24V voltage terminal, pin 4 of the URA2424YMD power module is grounded, and the third capacitor and the fifth capacitor are respectively connected in parallel between pin 3 and pin 4 of the URA2424YMD power module, pin 5 of the URA2424YMD power module is connected to the negative electrode of the 24V voltage terminal, and the eighth capacitor and the ninth capacitor are respectively connected in parallel between pin 4 and pin 5 of the URA2424YMD power module.

[0012] Preferably, the power supply circuit further includes a resistance voltage divider circuit;

[0013] The resistor voltage divider circuit includes a DB-15 connector, and pins 3 and 13 of the DB-15 connector are connected to a 3.3V voltage terminal via a seventh resistor and are grounded via an eighth resistor.

[0014] Preferably, the minimum system unit includes a STM32F767IGT6 microcontroller.

[0015] Preferably, the photoelectric conversion circuit comprises a FR50MHIR optical fiber receiver;

[0016] Pin 1 of the FR50MHIR fiber optic receiver is connected to pin 116 of the STM32F767IGT6 microcontroller, pin 2 of the FR50MHIR fiber optic receiver is grounded, pin 3 of the FR50MHIR fiber optic receiver is connected to the 3.3V voltage terminal and is grounded through the first capacitor, the second capacitor and the fourth capacitor connected in parallel, and pins 5 and 8 of the FR50MHIR fiber optic receiver are grounded.

[0017] Preferably, it further comprises a serial port circuit; one end of the serial port circuit is connected to the minimum system unit, and the other end of the serial port circuit is connected to the display screen;

[0018] The serial port circuit includes a first interface, pin 1 of the first interface is connected to a 5V voltage terminal, pin 2 and pin 3 of the first interface are respectively connected to pin 93 and pin 94 of the STM32F767IGT6 microcontroller, and pin 4 of the first interface is grounded.

[0019] As preferably, it also includes a key circuit;

[0020] The key circuit includes a key, a pin 1 of the key is connected to a 3.3V voltage terminal, a pin 2 of the key is grounded via a twenty-fifth resistor, and a pin 3 of the key is grounded.

[0021] Preferably, it also includes an LED circuit;

[0022] The LED circuit comprises a light emitting diode, the positive electrode of the light emitting diode is connected to the 3.3V voltage terminal via a fifteenth resistor, and the negative electrode of the light emitting diode is grounded.

[0023] As preferably, it also includes a bus circuit;

[0024] The bus circuit includes a bus interface, wherein pin 1 of the bus interface is connected to a 5V voltage terminal, pin 2 of the bus interface is grounded, and pins 3 and 4 of the bus interface are respectively connected to pins 164 and 165 of the STM32F767IGT6 microcontroller.

[0025] The utility model has the following beneficial effects:

[0026] The utility model adopts a minimum system unit with a built-in digital filter to replace the bit stream data conversion chip of the traditional solution, thereby reducing the cost and saving the area of ​​the printed circuit board; and omitting the data interaction process between the active filter chip and the MCU, thereby improving the efficiency of information transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a Delta-Sigma ADC data reading device;

[0028] Figure 2 This is a schematic diagram of the principle of a 5V voltage conversion circuit;

[0029] Figure 3 It is the principle diagram of 3.3V voltage conversion circuit;

[0030] Figure 4 This is a schematic diagram of the principle of the external power supply circuit;

[0031] Figure 5 It is the principle diagram of the resistor voltage divider circuit;

[0032] Figure 6 It is the principle diagram of the minimum system unit;

[0033] Figure 7 It is the principle schematic diagram of the photoelectric conversion circuit;

[0034] Figure 8 This is a schematic diagram of the serial port circuit;

[0035] Fig. 9 It is the principle diagram of the key circuit;

[0036] Fig.10 This is a schematic diagram of the LED circuit;

[0037] Fig.11 This is a schematic diagram of the bus circuit. DETAILED DESCRIPTION

[0038] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0039] like Figure 1As shown, an embodiment of the utility model provides a Delta-Sigma ADC data reading device, including a power supply circuit, a photoelectric conversion circuit and a minimum system unit; one end of the power supply circuit is connected to an external DC power supply, and one end of the power supply circuit is respectively connected to the power supply end of the photoelectric conversion circuit and the power supply end of the minimum system unit; one end of the photoelectric conversion circuit is connected to an optical signal input end, and the other end of the photoelectric conversion circuit is connected to a signal end of the minimum system unit.

[0040] This embodiment adopts the minimum system unit STM32F767 of STMicroelectronics, and its built-in digital filter DFSDM replaces the bit stream data conversion chip of the traditional solution, thereby reducing the cost and saving the area of ​​the printed circuit board; and omitting the data interaction process between the active filter chip and the MCU, thereby improving the efficiency of information transmission.

[0041] In an optional embodiment of the present utility model, the power supply circuit includes a 5V voltage conversion circuit and a 3.3V voltage conversion circuit;

[0042] like Figure 2 As shown, the 5V voltage conversion circuit includes a URB2405S power module U3, wherein the pin 1 of the URB2405S power module U3 is connected to the negative electrode Power- of the external DC power supply, the pin 2 of the URB2405S power module U3 is connected to the positive electrode Power+ of the external DC power supply through the third diode V3, and the second diode V2 and the tenth capacitor C10 are respectively connected in parallel between the pin 1 and the pin 2 of the URB2405S power module U3; the pin 6 of the URB2405S power module U3 is connected to the 5V voltage terminal, the pin 7 of the URB2405S power module U3 is grounded, and the pin 6 and the pin 7 of the URB2405S power module U3 are respectively connected in parallel with the eleventh capacitor C11, the twelfth capacitor C12, the thirteenth capacitor C13, the fourteenth capacitor C14, the fifteenth capacitor C15 and the fourth diode V4;

[0043] like Figure 3 As shown, the 3.3V voltage conversion circuit includes a LM1085ISX voltage regulator U4, wherein pin 4 of the LM1085ISX voltage regulator U4 is connected to pin 2, pin 3 of the LM1085ISX voltage regulator U4 is connected to a 5V voltage terminal and is grounded via a sixteenth capacitor C16 and a seventeenth capacitor C17 connected in parallel, pin 2 of the LM1085ISX voltage regulator U4 is connected to a 3.3V voltage terminal and is grounded via an eighteenth capacitor C18 and a nineteenth capacitor C19 connected in parallel, and pin 1 of the LM1085ISX voltage regulator U4 is grounded.

[0044] In an optional embodiment of the present utility model, the power supply circuit further includes an external power supply circuit;

[0045] like Figure 4 As shown, the external power supply circuit includes a URA2424YMD power module DC1, a pin 2 of the URA2424YMD power module DC1 is connected to the positive electrode Power+ of the external DC power supply through a first diode V1 and a first fuse F1, a pin 1 of the URA2424YMD power module DC1 is connected to the negative electrode Power- of the external DC power supply, and a sixth capacitor C6 and a seventh capacitor C7 are connected in parallel between pin 1 and pin 2 of the URA2424YMD power module DC1, respectively. Pin 3 of the RA2424YMD power module DC1 is connected to the positive pole of the 24V voltage terminal, pin 4 of the URA2424YMD power module DC1 is grounded, and the third capacitor C3 and the fifth capacitor C5 are respectively connected in parallel between pin 3 and pin 4 of the URA2424YMD power module DC1, pin 5 of the URA2424YMD power module is connected to the negative pole of the 24V voltage terminal, and the eighth capacitor C8 and the ninth capacitor C9 are respectively connected in parallel between pin 4 and pin 5 of the URA2424YMD power module.

[0046] In an optional embodiment of the present utility model, the power supply circuit further includes a resistance voltage divider circuit;

[0047] like Figure 5 As shown, the resistor voltage divider circuit includes a DB-15 connector X4, and pins 3 and 13 of the DB-15 connector X4 are connected to the 3.3V voltage terminal through a seventh resistor R7, and are grounded through an eighth resistor R8.

[0048] The utility model uses URA2424YMD-6WR3 to convert 9-36V DC input into ±24V DC output, which is supplied to an analog quantity acquisition board; uses URB2405S-6WR3 to convert 9-36V DC input into 5V DC output, which is supplied to a serial port screen; and uses LM1085ISX-3.3 / NOPB to convert 5V DC into 3.3V DC to supply an MCU and a photoelectric conversion circuit.

[0049] In an optional embodiment of the present invention, the minimum system unit includes a STM32F767IGT6 microcontroller, such as Figure 6 shown.

[0050] In an optional embodiment of the present utility model, the photoelectric conversion circuit includes a FR50MHIR optical fiber receiver U1;

[0051] like Figure 7As shown, pin 1 of the FR50MHIR fiber optic receiver U1 is connected to pin 116 of the STM32F767IGT6 microcontroller, pin 2 of the FR50MHIR fiber optic receiver U1 is grounded, pin 3 of the FR50MHIR fiber optic receiver U1 is connected to the 3.3V voltage terminal and is grounded through the first capacitor C1, the second capacitor C2 and the fourth capacitor C4 connected in parallel, and pins 5 and 8 of the FR50MHIR fiber optic receiver U1 are grounded.

[0052] In the utility model, the optical signal is connected to the circuit board through the optical fiber, and the optical signal is converted into an electrical signal through the optical fiber receiver FR50MHIR. The utility model utilizes optical fiber communication to avoid the influence of electromagnetic interference, reduces the bit error rate of data, and improves the reliability of communication.

[0053] In an optional embodiment of the present invention, a serial port circuit is further included; one end of the serial port circuit is connected to the minimum system unit, and the other end of the serial port circuit is connected to the display screen;

[0054] like Figure 8 As shown, the serial port circuit includes a first interface J1, pin 1 of the first interface J1 is connected to a 5V voltage terminal, pin 2 and pin 3 of the first interface J1 are respectively connected to pin 93 and pin 94 of the STM32F767IGT6 microcontroller, and pin 4 of the first interface J1 is grounded.

[0055] In an optional embodiment of the utility model, it also includes a key circuit;

[0056] like Fig. 9 As shown, the key circuit includes at least one key. Taking key X7 as an example, pin 1 of key X7 is connected to a 3.3V voltage terminal, pin 2 of key X7 is grounded via a twenty-fifth resistor R25, and pin 3 of key X7 is grounded.

[0057] In an optional embodiment of the utility model, it also includes an LED circuit;

[0058] like Fig.10 As shown, the LED circuit includes at least one light emitting diode. Taking the light emitting diode H2 as an example, the positive electrode of the light emitting diode H2 is connected to the 3.3V voltage terminal through the fifteenth resistor R15, and the negative electrode of the light emitting diode H2 is grounded.

[0059] In this embodiment, the LED circuit is driven by 3.3V, and the current flows into the IO pin of the MCU after passing through a 500-ohm current-limiting resistor. The on and off of the LED light is controlled by the MCU.

[0060] In an optional embodiment of the utility model, it also includes a bus circuit;

[0061] like Fig.11 As shown, the bus circuit includes a bus interface X3, pin 1 of the bus interface X3 is connected to a 5V voltage terminal, pin 2 of the bus interface X3 is grounded, and pin 3 and pin 4 of the bus interface X3 are respectively connected to pin 164 and pin 165 of the STM32F767IGT6 microcontroller.

[0062] The present invention uses specific embodiments to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

[0063] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations based on the technical inspirations disclosed in the present invention without departing from the essence of the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A Delta-Sigma ADC data reading device, characterized in that: It includes a power supply circuit, a photoelectric conversion circuit and a minimum system unit; one end of the power supply circuit is connected to an external DC power supply, and one end of the power supply circuit is respectively connected to the power supply end of the photoelectric conversion circuit and the power supply end of the minimum system unit; one end of the photoelectric conversion circuit is connected to an optical signal input end, and the other end of the photoelectric conversion circuit is connected to a signal end of the minimum system unit.

2. A Delta-Sigma ADC data reading device according to claim 1, characterized in that, The power supply circuit includes a 5V voltage conversion circuit and a 3.3V voltage conversion circuit; The 5V voltage conversion circuit includes a URB2405S power module, wherein pin 1 of the URB2405S power module is connected to the negative electrode of the external DC power supply, pin 2 of the URB2405S power module is connected to the positive electrode of the external DC power supply via a third diode, and a second diode and a tenth capacitor are respectively connected in parallel between pin 1 and pin 2 of the URB2405S power module; pin 6 of the URB2405S power module is connected to the 5V voltage terminal, pin 7 of the URB2405S power module is grounded, and pin 6 and pin 7 of the URB2405S power module are respectively connected in parallel with an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor and a fourth diode; The 3.3V voltage conversion circuit includes an LM1085ISX voltage regulator, wherein pin 4 of the LM1085ISX voltage regulator is connected to pin 2, pin 3 of the LM1085ISX voltage regulator is connected to a 5V voltage terminal and is grounded via a sixteenth capacitor and a seventeenth capacitor connected in parallel, pin 2 of the LM1085ISX voltage regulator is connected to a 3.3V voltage terminal and is grounded via an eighteenth capacitor and a nineteenth capacitor connected in parallel, and pin 1 of the LM1085ISX voltage regulator is grounded.

3. A Delta-Sigma ADC data reading device according to claim 2, characterized in that, The power supply circuit also includes an external power supply circuit; The external power supply circuit includes a URA2424YMD power module, pin 2 of the URA2424YMD power module is connected to the positive electrode of the external DC power supply through a first diode and a first fuse, pin 1 of the URA2424YMD power module is connected to the negative electrode of the external DC power supply, and the sixth capacitor and the seventh capacitor are respectively connected in parallel between pin 1 and pin 2 of the URA2424YMD power module, pin 3 of the URA2424YMD power module is connected to the positive electrode of the 24V voltage terminal, pin 4 of the URA2424YMD power module is grounded, and the third capacitor and the fifth capacitor are respectively connected in parallel between pin 3 and pin 4 of the URA2424YMD power module, pin 5 of the URA2424YMD power module is connected to the negative electrode of the 24V voltage terminal, and the eighth capacitor and the ninth capacitor are respectively connected in parallel between pin 4 and pin 5 of the URA2424YMD power module.

4. A Delta-Sigma ADC data reading device according to claim 3, characterized in that, The power supply circuit also includes a resistor voltage divider circuit; The resistor voltage divider circuit includes a DB-15 connector, and pins 3 and 13 of the DB-15 connector are connected to a 3.3V voltage terminal via a seventh resistor and are grounded via an eighth resistor.

5. A Delta-Sigma ADC data reading device according to claim 4, characterized in that, The minimum system unit includes a STM32F767IGT6 microcontroller.

6. A Delta-Sigma ADC data reading device according to claim 5, characterized in that, The photoelectric conversion circuit includes a FR50MHIR optical fiber receiver; Pin 1 of the FR50MHIR fiber optic receiver is connected to pin 116 of the STM32F767IGT6 microcontroller, pin 2 of the FR50MHIR fiber optic receiver is grounded, pin 3 of the FR50MHIR fiber optic receiver is connected to the 3.3V voltage terminal and is grounded through the first capacitor, the second capacitor and the fourth capacitor connected in parallel, and pins 5 and 8 of the FR50MHIR fiber optic receiver are grounded.

7. A Delta-Sigma ADC data reading device according to claim 6, characterized in that: It also includes a serial port circuit; one end of the serial port circuit is connected to the minimum system unit, and the other end of the serial port circuit is connected to the display screen; The serial port circuit includes a first interface, pin 1 of the first interface is connected to a 5V voltage terminal, pin 2 and pin 3 of the first interface are respectively connected to pin 93 and pin 94 of the STM32F767IGT6 microcontroller, and pin 4 of the first interface is grounded.

8. A Delta-Sigma ADC data reading device according to claim 7, characterized in that: Also includes a key circuit; The key circuit includes a key, a pin 1 of the key is connected to a 3.3V voltage terminal, a pin 2 of the key is grounded via a twenty-fifth resistor, and a pin 3 of the key is grounded.

9. A Delta-Sigma ADC data reading device according to claim 8, characterized in that: It also includes LED circuits; The LED circuit comprises a light emitting diode, the positive electrode of the light emitting diode is connected to the 3.3V voltage terminal via a fifteenth resistor, and the negative electrode of the light emitting diode is grounded.

10. A Delta-Sigma ADC data reading device according to claim 9, characterized in that: Also included is a bus circuit; The bus circuit includes a bus interface, wherein pin 1 of the bus interface is connected to a 5V voltage terminal, pin 2 of the bus interface is grounded, and pins 3 and 4 of the bus interface are respectively connected to pins 164 and 165 of the STM32F767IGT6 microcontroller.

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