Millivolt-level conversion regulation and output circuit for alternating current and direct current signals

Abstract

The utility model belongs to the technical field of AC / DC voltage signal conditioning, and provides an AC / DC signal millivolt level conversion regulation and output circuit, which comprises a digital circuit, an isolation module and an analog circuit, the digital circuit comprises a communication module, a main processing MCU module and a digital circuit power supply module, the communication module is connected with the main processing MCU module, and the MCU and the digital circuit power supply module are connected with the isolation module; according to the utility model, an alternating current signal is connected to the input end, a voltage signal is converted into voltage signals with different amplitudes and with the same frequency and phase through two-stage conditioning and conversion, the magnitude of the voltage amplitude can be controlled through the main processing MCU module, and the voltage amplitude can be regulated and output in a step-by-step manner at the minimum millivolt level.

Description

Technical Field

[0001] This utility model belongs to the field of AC / DC voltage signal conditioning technology, and in particular relates to an AC / DC signal millivolt-level conversion, regulation and output circuit. Background Technology

[0002] With the rapid development of science and technology, AC / DC voltage signal conditioning technology and signal sensor detection technology have occupied an important position in the process of scientific and technological development. However, AC / DC voltage signal conditioning technology is basically limited to the voltage (V) level, and it is rare to achieve the millivolt level signal conditioning, which to some extent restricts the development of this technology.

[0003] In the field of signal sensor detection technology, many new sensors generate voltages at the millivolt level during their development. To detect the stability and coverage of the sensor's output voltage, a millivolt-level detection device is required, as well as a device to simulate the sensor for comprehensive testing of the interface equipment. Solving the technical challenges of millivolt-level step conditioning and signal output has greatly limited the technological development in related fields. Therefore, a millivolt-level conversion, regulation, and output circuit for AC / DC signals is needed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a millivolt-level conversion, regulation, and output circuit for AC / DC signals to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a millivolt-level conversion, adjustment, and output circuit for AC / DC signals, comprising a digital circuit, an isolation module, and an analog circuit. The digital circuit and the analog circuit are both connected to the isolation circuit. The digital circuit includes a communication module, a main processing MCU module, and a digital circuit power supply module. The communication module is connected to the main processing MCU module, and the MCU and the digital circuit power supply module are connected to the isolation module.

[0006] The analog circuit includes a current regulation and compression module, a current-to-voltage conversion module, a millivolt-level regulation module, a millivolt-level regulated output module, and an analog circuit power supply module. The current regulation and compression module is connected to the current-to-voltage conversion module, the current-to-voltage conversion module is connected to the millivolt-level regulation module, the millivolt-level regulation module is connected to the volt-level regulated output module, the millivolt-level regulation module is connected to an isolation module, and the analog circuit power supply module is connected to the isolation module.

[0007] After signal conditioning, the AC and DC current signals in this circuit can be simultaneously output from multiple channels as AC voltage signals of the same frequency and phase but different amplitudes. Furthermore, the amplitude of each channel can be individually output and adjusted at the millivolt level. This circuit is used for signal conditioning, analog sensor output, and sensor detection equipment.

[0008] In a further technical solution, the communication module is connected to the control computer.

[0009] In a further technical solution, the MCU inputs control data to the isolation module, and the digital circuit power supply module provides digital power to the isolation module.

[0010] In a further technical solution, the current regulation and compression module and the current-to-voltage conversion module are respectively connected to the AC current input signal and the AC voltage input signal.

[0011] In a further technical solution, the millivolt-level regulated output module is used for millivolt-level AC / DC signal output, and the millivolt-level adjustment module receives a DC voltage input signal.

[0012] In a further technical solution, the current-to-voltage conversion module, the millivolt-level adjustment module, and the millivolt-level regulated output module constitute a variable channel zone.

[0013] In a further technical solution, the isolation module inputs control data to the millivolt-level adjustment module, and the analog circuit power supply module provides analog power to the isolation module.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention involves inputting an AC current signal at the input terminal and converting it into a voltage signal with different amplitudes at the same frequency and phase through two stages of conditioning and conversion. The voltage amplitude can be controlled by the main processing MCU module, and the voltage amplitude can be adjusted and output in millivolt steps as low as the millivolt level.

[0016] This invention disassembles and reassembles the overall analog circuit, enabling the conversion of AC voltage into voltage signals of different amplitudes with the same frequency and phase. The voltage amplitude can be controlled by the main processing MCU module, with the voltage amplitude adjustable and output in millivolt steps. It can also achieve step adjustment and output of DC voltage in millivolt steps.

[0017] This utility model uses an MCU as the main control unit for data transmission and control, but other microcontrollers can also be used for control. At the same time, the number of channels can be increased, decreased, or freely combined according to different needs, which greatly enriches the scalability and application scope of the technology. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the principle of this utility model;

[0019] Figure 2 This is the circuit diagram of the MCU of this utility model;

[0020] Figure 3 This is a circuit diagram of the communication module of this utility model;

[0021] Figure 4 This is a circuit diagram of the digital circuit power supply module of this utility model;

[0022] Figure 5 This is a circuit diagram of the isolation module of this utility model;

[0023] Figure 6 This is a circuit diagram of the analog circuit power supply module of this utility model;

[0024] Figure 7 This is a circuit diagram of the current regulation compression module, current-voltage conversion module, millivolt-level regulation module, and millivolt-level regulated output module of this utility model. Detailed Implementation

[0025] The present invention will be further described below with reference to the embodiments.

[0026] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0027] Please see Figure 1-7 This utility model provides a millivolt-level conversion, adjustment, and output circuit for AC / DC signals, including a digital circuit, an isolation module, and an analog circuit. The digital circuit and the analog circuit are both connected to the isolation circuit. The digital circuit includes a communication module, a main processing MCU module, and a digital circuit power supply module. The communication module is connected to a control computer and the main processing MCU module. The MCU and the digital circuit power supply module are connected to the isolation module. The MCU inputs control data to the isolation module, and the digital circuit power supply module provides digital power to the isolation module.

[0028] The analog circuit includes a current regulation and compression module, a current-to-voltage conversion module, a millivolt-level regulation module, a millivolt-level regulated output module, and an analog circuit power supply module. The current regulation and compression module and the current-to-voltage conversion module are respectively connected to AC current input signal and AC voltage input signal. The millivolt-level regulated output module is used for millivolt-level AC / DC signal output. The millivolt-level regulation module receives a DC voltage input signal. The current regulation and compression module is connected to the current-to-voltage conversion module, the current-to-voltage conversion module is connected to the millivolt-level regulation module, the millivolt-level regulation module is connected to the millivolt-level regulated output module, the millivolt-level regulation module is connected to an isolation module, and the analog circuit power supply module is connected to the isolation module. The current-to-voltage conversion module, the millivolt-level regulation module, and the millivolt-level regulated output module constitute a variable channel area. The isolation module inputs control data to the millivolt-level regulation module, and the analog circuit power supply module provides analog power to the isolation module.

[0029] In this embodiment, after signal conditioning, the AC and DC current signals can be simultaneously output from multiple channels with the same frequency and phase but different amplitudes, and the amplitude of each channel can be individually output and adjusted at the millivolt level, for signal conditioning, analog sensor output, and sensor detection equipment.

[0030] like Figure 2As shown, this utility model provides a millivolt-level conversion, adjustment, and output circuit for AC / DC signals. The MCU uses a U1 chip, specifically a GD32F103VCT6 chip. Pins 1, 2, and 3 of the GD32F103VCT6 chip are connected to SYN-1, SCK-1, and SDI-1, respectively. Pins 4, 5, 7, 8, 9, 15, 16, 17, 18, 23, 24, 31, 32, 33, 34, 35, 36, 38, 39, 46, 47, 48, and 49 of the GD32F103VCT6 chip are also connected to the MCU. Pins 55, 56, 57, 58, 62, 63, 64, 65, 80, 81, 82, 83, 84, 85, 86, 87, 88, and 93 are all connected to placeholders. Pins 6, 37, and 94 of the GD32F103VCT6 chip are connected to R1, R3, and R4 respectively. R1 is connected to VCC 3.3V, and R3 and R4 are both grounded. The values ​​of R1, R3, and R4 are all set to 10K. Pins 10, 19, 20, 27, 49, 74, and 99 of the GD32F103VCT6 chip are all grounded. Pins 11, 21, 22, 28, 50, 75, and 100 of the 2F103VCT6 chip are all connected to VCC 3.3V. Pins 25, 26, 29, 30, 40, 41, 42, 43, 44, 45, 51, 52, 53, 54, 59, 60, 61, 68, 69, 70, 71, 72, 76, 77, 78, 79, 89, 90, 91, 92, 95, 96, 97, and 98 of the GD32F103VCT6 chip are also connected to VCC 3.3V. Connect to USART1-TX, USART1-RX, RE, DE, KEY-6, KEY-5, KEY-4, KEY-3, KEY-2, KEY-1, SPI1-NSS, SPI1-SCK, SPI1-MISO, SPI1-MOSI, SYN-2, SCK-2, SDI-2, PC9, USART0-TX, USART0-RX, CH395Q-INT#, CH-RSTI, SWDIO, SWCLK, CH-SEL, CH-RST, CH-RDY#, CTL-K3, CTL-K4, CTL-K1, CTL-K2, PB8, PB9, PE0, and PE1 respectively;

[0031] like Figure 3 As shown, this utility model provides a millivolt-level conversion, adjustment, and output circuit for AC / DC signals. The communication module uses a U3 chip, specifically a CH396Q chip. Pins 1, 4, 5, 7, 8, 10, 11, 25, 26, 27, 36, 49, 57, 59, 60, 61, and 62 of the CH396Q chip are respectively connected to R24, CH-RXP, CH-RXN, and CH-T. XP, CH-TXN, XI, XO, RSTCH-RDY#, SELCH, 8V, CH-RXT1, CH395Q-INT#, NC, SPI1-NSS, SPI1-SCK, SPI1-MOSI, and SPI1-MISO are connected. R24 is grounded, and the value of R24 is set to 18K. Pins 2, 6, 12, 17, 19, 21, 28, 29, 40, and 42 of the CH396Q chip are connected. Pins 43, 45, 54, 63, and 64 are respectively connected to VCC-3.3V, VCC-1.8V, VCC-3.3V, VCC-3.3V, VCC-1.8V, VCC-3.3V, VCC-1.8V, VCC-3.3V, VCC-3.3V, VCC-3.3V, VCC-1.8V, VCC-3.3V, VCC-1.8V, VCC-3.3V, and VCC-1.8V. Pins 9 and 64 of the CH396Q chip are also connected to VCC-3.3V, VCC-1.8V, VCC-1.8V, VCC-3.3V, and VCC-1.8V. 13. Pins 18, 20, 37, 41, 44, and 48 are all grounded. Pin 52 of the CH396Q chip is connected to R19 and R20 respectively. R19 and R20 are connected to LEDA and LEDB respectively. Pin 57 of the CH396Q chip is connected to NC. NC is connected to USART0-TX through R21. Pin 58 of the CH396Q chip is connected to R22 and R23 through NC respectively. R22 is connected to USART0-RX.

[0032] like Figure 4As shown, this utility model provides a millivolt-level conversion, adjustment, and output circuit for AC / DC signals. The digital circuit power supply module includes U4, U5, U15, U6, and U7. U4, U5, U15, U6, and U7 are respectively configured as a 5N10-MS chip, an LM2596S-12 / TR chip, an LM2596S-5.0 chip, an SK1117-3.3 chip, and an SK1117-108 chip. The 5N10-MS chip is connected to IN-GND and V... Connect CC-2.4V, R30, C28, and C29. R30, C28, and C29 are all grounded. Pin 1 of the LM2596S-12 / TR chip is connected to VCC-2.4V. Pin 2 of the LM2596S-12 / TR chip is connected to L1 and D5. L1 and pin 4 of the LM2596S-12 / TR chip are connected to VCC-12V and C32, respectively. Pins 3, 5, and 6 of the LM2596S-12 / TR chip... Both D5 and C32 are grounded; pin 1 of the LM2596S-5.0 chip is connected to VCC-2.4V, pin 2 of the LM2596S-5.0 chip is connected to L3 and D12, L3 and pin 4 of the LM2596S-5.0 chip are connected to VCC-5V and C36 respectively, and pins 3, 5, 6, D5, and C36 of the LM2596S-5.0 chip are all grounded; the SK1117-3.3 chip and SK1117-108... Pin 1 of the chip is grounded. Pins 2 and 4 of the SK1117-3.3 chip are connected to C30, VCC-3.3V and C31, and C30 and C31 are grounded. Pins 3 of the SK1117-3.3 chip and the SK1117-108 chip are connected to VCC-5V and VCC-3.3V respectively. Pins 2 and 4 of the SK1117-108 chip are connected to C34, VCC-1.8V and C35, and C34 and C35 are grounded.

[0033] like Figure 5As shown, this utility model provides a millivolt-level conversion, adjustment, and output circuit for AC / DC signals. The isolation module uses U29 and U32 chips, both of which are ADUM1401ARWZ-RL chips. Pin 1 of both the U29 and U32 chips is connected to VCC-3.3V. Pins 2 and 8 of both the U29 and U32 chips are grounded. Pins 6, 7, and 11 of both the U29 and U32 chips are connected to placeholders. Pins 9 and 15 of both the U29 and U32 chips are connected to AGND. Pins 10 and 16 of both the U29 and U32 chips are connected to +5V. Pins 3, 4, 5, 12, 13, and 14 of the U29 chip are grounded. Pin 14 is connected to SDI-1, SCK-1, SYN-1, SYNC-1, SCLK-1, and SDIN-1 respectively. Pins 3, 4, 5, 12, 13, and 14 of the U29 chip are connected to R125, R126, R127, R130, R129, and R128 respectively. Pins 3, 4, 5, 12, 13, and 14 of the U32 chip are connected to SDI-2, SCK-2, SYN-2, SYNC-2, SCLK-2, and SDIN-2 respectively. Pins 3, 4, 5, 12, 13, and 14 of the U29 chip are connected to R132, R133, R134, R137, R136, and R135 respectively.

[0034] like Figure 6As shown, this utility model provides a millivolt-level conversion, adjustment, and output circuit for AC / DC signals. The analog circuit power supply module uses chips U12 and U20, which are respectively configured as CD12-24D12-J and AMS1117-5.0 chips. Pin 1 of the U12 chip is connected to a 4.7uF capacitor and L2, and L2 is connected to C59 and VCC-2.4V. Pin 2 of the U12 chip is connected to a 4.7uF capacitor and C59, and both the 4.7uF capacitor and C59 are grounded. Pin 3 of the U12 chip is connected to one end of C62, C64, and C67, and C62, C64, and C67 are all grounded. V connection, pin 4 of the U12 chip is connected to the other end of C62, C64 and C67, pin 4 of the U12 chip is connected to AGND, pin 4 of the U12 chip is connected to one end of C61, C63 and C66, pin 5 of the U12 chip is connected to the other end of C61, C63 and C66, C61, C63 and C66 are connected to +12V, pin 1 of the U20 chip is connected to AGND, pins 2 and 3 of the U20 chip are connected to +5V and +12V respectively, pin 4 of the U20 chip is connected to C70, C71 and C72, and the two ends of C70, C71 and C72 are connected to +5V and AGND respectively;

[0035] like Figure 7As shown, this utility model provides a millivolt-level conversion, regulation, and output circuit for AC / DC signals. The current regulation and compression module uses a U10 chip, and the current-to-voltage conversion module uses U9.1, U9.2, U39.1, and U39.2 chips. The U10 chip is configured as an HCTL201 chip. Pin 1 of the U10 chip and pin 2 of the U9.1 chip are both connected to one end of D6 and D7. Pin 1 of the U10 chip is connected to pin 2 of the U9.1 chip. Pin 2 of the U10 chip and pin 3 of the U9.1 chip are both connected to the other end of D6 and D7. Pins 2, 5, and 6 of the U10 chip are connected to AGND, AOUT1+, and AH1, respectively. Pins 3 and 4 of the U10 chip are both connected to placeholders. Pins 2 and 3 of the U9.1 chip are both connected to one end of R88 and C58. Pins 4 and 8 of chip 9.1 are both connected to -12V. Pins 1 of chip U9.1, pin 5 of chip U9.2, pin 3 of chip U39.1, and pin 5 of chip U39.2 are all connected to the other end of R88 and C58. Pin 1 of chip U9.1 is connected to pin 5 of chip U9.2 and pin 3 of chip U39.1. Pins 6 and 7 of chip U9.2 are connected to R106 and R104 respectively. Pins 4 and 8 of chip U39.1 are connected to -12V and +12V respectively. Pin 1 of chip U39.1 is connected to R10. Pin 5 of chip U39.2 is connected to pins 1 of chip U9.1, pin 5 of chip U9.2, and pin 3 of chip U39.1. Pins 1 of chip U39.1 and pins 6 and 7 of chip U39.2 are connected to R110 and R116 respectively.

[0036] The millivolt-level adjustment module uses chips U14, U19.1, U21, U24.1, U25, and Y28.1. Pin 1 of chip U14 and pin 2 of chip U19.1 are both connected to one end of C73. Pin 2 of chip U14 and pin 3 of chip U19.1 are both connected to AGND. Pins 3, 4, 5, 6, 7, 8, 9, and 10 of chip U14 are respectively connected to AGND, SCLK-1, SDO1-2, SYNC-1, and SDO1-3. +5V, R104, and R107 are connected. Pins 4 and 8 of the U19.1 chip are connected to -12V and +12V respectively. Pin 1 of the U19.1 chip is connected to R105, C73, and R107. Pins 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 of the U21 chip are connected to C75, AGND, AGND, SCLK-1, SDO1-1, SYNC-1, SDO1-2, +5V, R110, and R113 respectively. Pin 1 of the U21 chip and pin 2 of the U24.1 chip are both connected to one end of C75. The other end of C75 is connected to R113, pin 1 of the U24.1 chip, and R112. Pin 1 of the U24.1 chip is connected to R112. Pins 4 and 8 of the U24.1 chip are connected to -12V and +12V, respectively. Pin 6 of the U39.2 chip is connected to R117. Pins 1, 2, 3, 4, 5, 6, 7, 8, and 9 of the U25 chip are connected to... Pin 10 is connected to C757, AGND, AGND, SCLK-1, SDIN-1, SYNC-1, SDO1-1, +5V, R116, and R119 respectively. Pin 1 of the U25 chip and pin 2 of the U28.1 chip are both connected to one end of C77. The other end of C77 is connected to R119, pin 1 of the U28.1 chip, and R118. Pin 1 of the U28.1 chip is connected to R118. Pins 4 and 8 of the U28.1 chip are connected to -12V and +12V respectively.

[0037] The millivolt-level regulated output module uses chips U19.2, U24.2, and U28.2 respectively. Pin 6 of U19.2 is connected to R105, R106, and R108; pin 5 of U19.2 is connected to AGND and pin 3 of U19.1; pin 7 of U19.2 is connected to C98, R108, and V-MV1; and pin 6 of the U24.2 chip is connected to R112, R111, and R114. The connections are as follows: pin 5 of U24.2 is connected to AGND and pin 3 of U24.1; pin 7 of U24.2 is connected to C99, R114, and V-MV2; pin 6 of chip U28.2 is connected to R118, R117, and R120; pin 5 of U28.2 is connected to AGND and pin 3 of U28.1; and pin 7 of U28.2 is connected to C100, R120, and V-MV3.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A millivolt-level conversion, regulation, and output circuit for AC / DC signals, comprising digital circuitry, an isolation module, and analog circuitry, characterized in that: Both the digital circuit and the analog circuit are connected to the isolation circuit. The digital circuit includes a communication module, a main processing MCU module, and a digital circuit power supply module. The communication module is connected to the main processing MCU module, and the MCU and the digital circuit power supply module are connected to the isolation module. The analog circuit includes a current regulation and compression module, a current-to-voltage conversion module, a millivolt-level regulation module, a millivolt-level regulated output module, and an analog circuit power supply module. The current regulation and compression module is connected to the current-to-voltage conversion module, the current-to-voltage conversion module is connected to the millivolt-level regulation module, the millivolt-level regulation module is connected to the volt-level regulated output module, the millivolt-level regulation module is connected to an isolation module, and the analog circuit power supply module is connected to the isolation module.

2. The AC / DC signal millivolt-level conversion, adjustment, and output circuit according to claim 1, characterized in that: The communication module is connected to the control computer.

3. The AC / DC signal millivolt-level conversion, adjustment, and output circuit according to claim 1, characterized in that: The MCU inputs control data to the isolation module, and the digital circuit power supply module provides digital power to the isolation module.

4. The AC / DC signal millivolt-level conversion, adjustment, and output circuit according to claim 1, characterized in that: The current regulation and compression module and the current-to-voltage conversion module are respectively connected to the AC current input signal and the AC voltage input signal.

5. The AC / DC signal millivolt-level conversion, adjustment, and output circuit according to claim 1, characterized in that: The millivolt-level regulated output module is used for millivolt-level AC / DC signal output, and the millivolt-level adjustment module is used to input DC voltage input signal.

6. The AC / DC signal millivolt-level conversion, adjustment, and output circuit according to claim 1, characterized in that: The current-to-voltage conversion module, the millivolt-level adjustment module, and the millivolt-level regulated output module constitute the variable channel area.

7. The AC / DC signal millivolt-level conversion, adjustment, and output circuit according to claim 1, characterized in that: The isolation module inputs control data to the millivolt-level adjustment module, and the analog circuit power supply module provides analog power to the isolation module.

Images