Voltage-ammeter module

Abstract

The utility model relates to a volt-ammeter module, comprising a first voltage measuring part used for measuring the voltage value of a first voltage channel; the second voltage measuring part is used for measuring the voltage value of the second voltage channel; the current measuring part is used for measuring an accessed current value, and the output of the current measuring part is connected with the input of the second voltage measuring part; and the output of the first voltage measuring part and the output of the second voltage measuring part are respectively connected with the input of the analog-to-digital conversion part. And the volt-ammeter module is a 24-bit and 250kSPS highly integrated universal meter module. The device can measure double-channel + / -5V voltage and single-channel + / -2mA and + / -100uA current. The volt-ammeter module is a powerful tool for electronic component design, inspection, quality control and production test, has the advantages of small size and high integration level, and is very suitable for being applied to production lines and automatic tests.

Description

Technical Field

[0001] The present disclosure belongs to the field of electronic testing instruments, and in particular relates to a voltage and current meter module. Background Art

[0002] In the production line and automated testing process, it is often necessary to test two-way positive and negative 5V voltage and 2mA current and 100uA adjustable current. Directly using an ordinary multimeter often requires changing gears and test points, and changing test points is cumbersome. At the same time, ordinary multimeters cannot meet the required accuracy and high integration requirements, making it inconvenient for batch quality inspection. Utility Model Content

[0003] The utility model provides a voltage and current meter module, aiming to at least solve one of the technical problems existing in the prior art.

[0004] The technical solution of the utility model is a voltage and current meter module, comprising:

[0005] a first voltage measuring unit, configured to measure a voltage value of a first voltage channel;

[0006] a second voltage measuring unit, configured to measure a voltage value of a second voltage channel;

[0007] a current measuring unit, the current measuring unit being configured to measure an input current value, wherein an output of the current measuring unit is connected to an input of the second voltage measuring unit;

[0008] The analog-to-digital conversion unit has outputs of the first voltage measuring unit and the second voltage measuring unit connected to inputs of the analog-to-digital conversion unit, respectively.

[0009] Further, the first voltage measuring unit includes an 800th amplifier, an 800th resistor, an 810th resistor, an 801st resistor, an 803rd resistor, an 800th capacitor, an 801st capacitor, an 802nd capacitor, an 803rd capacitor, an 802nd resistor, an 804th resistor, and an 801A amplifier;

[0010] The first end of the first measured voltage is connected to the first end of the eighth zero resistor and the first end of the eighth zero resistor respectively, the second end of the eighth zero resistor is connected to the first end of the eighth zero resistor, and the second end of the eighth zero resistor and the first end of the eighth zero resistor are connected to the second end of the first measured voltage respectively.

[0011] The second end of the 800 resistor, the first end of the 800 capacitor, and the first end of the 801 capacitor are respectively connected to the non-inverting input terminal of the 800 amplifier, the second end of the 800 capacitor is connected to the first end of the 802 capacitor, and the second end of the 802 capacitor, the second end of the 803 resistor, and the second end of the 801 capacitor are respectively connected to the inverting input terminal of the 800 amplifier.

[0012] The output end of the 800 amplifier and the first end of the 802 resistor are respectively connected to the input of the analog-to-digital conversion unit, the second end of the 802 resistor, the first end of the 803 capacitor and the first end of the 804 resistor are respectively connected to the inverting input end of the 801A amplifier, the reference voltage end of the 800 amplifier, the second end of the 803 capacitor, the second end of the 804 resistor and the output end of the 801A amplifier are respectively connected to the input end of the analog-to-digital conversion unit, and the non-inverting input end of the 801A amplifier is connected to the reference voltage.

[0013] Further, the second voltage measuring unit includes an 802nd amplifier, an 805th resistor, an 811th resistor, an 806th resistor, an 808th resistor, an 804th capacitor, an 805th capacitor, an 806th capacitor, an 807th capacitor, an 807th resistor, an 809th resistor, and an 801B amplifier;

[0014] The first end of the second measured voltage is connected to the first end of the 805 resistor and the first end of the 811 resistor respectively, the second end of the 811 resistor is connected to the first end of the 806 resistor, and the second end of the 806 resistor and the first end of the 808 resistor are connected to the second end of the second measured voltage respectively.

[0015] The second end of the 805th resistor, the first end of the 804th capacitor, and the first end of the 805th capacitor are respectively connected to the non-inverting input terminal of the 802nd amplifier, the second end of the 804th capacitor is connected to the first end of the 806th capacitor, and the second end of the 806th capacitor, the second end of the 808th resistor, and the second end of the 805th capacitor are respectively connected to the inverting input terminal of the 802nd amplifier.

[0016] The output end of the 802 amplifier and the first end of the 807 resistor are respectively connected to the input of the analog-to-digital conversion unit, the second end of the 807 resistor, the first end of the 807 capacitor and the first end of the 809 resistor are respectively connected to the inverting input end of the 801B amplifier, the reference voltage end of the 802 amplifier, the second end of the 807 capacitor, the second end of the 809 resistor and the output end of the 801B amplifier are respectively connected to the input end of the analog-to-digital conversion unit, and the non-inverting input end of the 801B amplifier is connected to the reference voltage.

[0017] Furthermore, the current measuring unit includes a range selection module and an amplification module connected in sequence.

[0018] Furthermore, the range selection module includes a first,001st relay, a first,001st resistor, a first,003rd resistor, a first,004th resistor and a first,000th switching diode.

[0019] The first end of the first 001 resistor and the third end of the first 000 switching diode are respectively connected to the input end of the measured current, the second end of the first 001 resistor, the first 003 resistor, the first 004 resistor and the first end and second end of the first 000 switching diode are connected in sequence, the third input end and the fifth input end of the first 001 relay are respectively connected to the first end and second end of the first 000 switching diode, the second input end and the seventh input end of the first 001 relay are connected to the first end of the first 003 resistor, the eighth input end of the first 001 relay is the control end, and the third end and the sixth end of the first 001 relay are the selected current output ends.

[0020] Further, the amplification module includes a first amplifier, a first resistor, a first resistor, a first resistor, a first resistor, a first capacitor, a first capacitor, a first capacitor, a first capacitor, a first resistor, a first resistor, and a first resistor.

[0021] The first end of the first 005 resistor and the first end of the first 006 resistor are respectively connected to the third end of the first 001 relay, the second end of the first 006 resistor and the first end of the first 009 resistor are respectively connected to the third end of the first 000 switching diode, the second end of the first 004 capacitor is connected to the first end of the first 006 capacitor, the second end of the first 005 resistor, the first end of the first 004 capacitor and the first end of the first 005 capacitor are respectively connected to the non-inverting input terminal of the first 000 amplifier, the second end of the first 009 resistor, the second end of the first 006 capacitor and the second end of the first 005 capacitor are respectively connected to the inverting input terminal of the first 000 amplifier, and the two ends of the first 007 resistor and the first 008 resistor connected in parallel are respectively connected to the two input terminals of the reference voltage of the first 000 amplifier.

[0022] Furthermore, the analog-to-digital conversion unit includes a seventh analog-to-digital converter, a first voltage input module, a second voltage input module, a bias voltage input module, an output module, a power input module, and a crystal oscillator module, wherein the first voltage input module, the second voltage input module, the bias voltage input module, and the output module are respectively connected to the seventh analog-to-digital converter;

[0023] The first voltage input module includes a 700th diode, a 701st diode, a 701st capacitor, a 700th capacitor, a 702nd capacitor, a 701st resistor, a 702nd resistor, a 700th resistor and a 703rd resistor.

[0024] The third end of the 700th diode, the first end of the 701st capacitor, the first end of the 700th capacitor, the first end of the 701st resistor, and the first end of the 700th resistor are respectively connected to the AIN0 terminal of the 700th analog-to-digital converter; the third end of the 701st diode, the second end of the 701st capacitor, the second end of the 702nd capacitor, the second end of the 702nd resistor, and the first end of the 703rd resistor are respectively connected to the AIN1 terminal of the 700th analog-to-digital converter; the second end of the 700th resistor and the second end of the 703rd resistor are respectively connected to the output of the first voltage measuring unit;

[0025] The second voltage input module includes a 702nd diode, a 703rd diode, a 709th capacitor, a 704th capacitor, a 710th capacitor, a 705th resistor, a 706th resistor, a 704th resistor and a 707th resistor.

[0026] The third end of the 702 diode, the first end of the 709 capacitor, the first end of the 704 capacitor, the first end of the 705 resistor and the first end of the 704 resistor are respectively connected to the AIN2 terminal of the 700 analog-to-digital converter, the third end of the 703 diode, the second end of the 709 capacitor, the second end of the 710 capacitor, the second end of the 706 resistor and the first end of the 707 resistor are respectively connected to the AIN3 terminal of the 700 analog-to-digital converter, and the second end of the 704 resistor and the second end of the 707 resistor are respectively connected to the output of the second voltage measuring unit.

[0027] Furthermore, the bias voltage input module includes a 701st voltage reference chip, a 717th capacitor, a 718th capacitor, a 719th capacitor, a 720th capacitor, a 708th resistor, a 709th resistor, a 710th resistor, and a 716th capacitor.

[0028] The VIN terminal of the 701 voltage reference chip is connected to the power supply, the VIN terminal of the 701 voltage reference chip is connected in parallel through the 717th capacitor and the 718th capacitor respectively, and then connected to the GND terminal of the 701 voltage reference chip, the VOUT terminal of the 701 voltage reference chip is connected in parallel through the 719th capacitor and the 720th capacitor respectively, and then connected to the analog ground, the VOUT terminal of the 701 voltage reference chip is connected to the REF+ terminal of the 700th analog-to-digital converter, and also includes the REF+ terminal of the 700th analog-to-digital converter, the 708th resistor, the 709th resistor and the 710th resistor connected in sequence, the first end of the 716th capacitor is connected to the first end of the 709th resistor, and the second end of the 716th capacitor is connected to the second end of the 710th resistor.

[0029] Further, the output module includes an SPI_DIN output terminal connected to the DIN terminal of the 700th analog-to-digital converter, an SPI_DOUT output terminal connected to the DOUT terminal of the 700th analog-to-digital converter, an SPI_CLK output terminal connected to the SCLK terminal of the 700th analog-to-digital converter, and an SPI_CS output terminal connected to the CS terminal of the 700th analog-to-digital converter.

[0030] Furthermore, it also includes a signal isolation unit, which includes an SPI signal isolation module for SPI signal isolation and an IIC isolation module for IIC isolation.

[0031] The SPI signal isolation module includes a 401 signal isolator, and the IIC isolation module includes a 400 signal isolator.

[0032] The beneficial effects of the present utility model are as follows:

[0033] This application proposes a 24-bit, 250kSPS, highly integrated multimeter module. It can conveniently measure dual-channel ±5V voltage and single-channel currents of ±2mA and ±100uA simultaneously. This module is a powerful tool for electronic component design, inspection, quality control, and production testing. Its compact size and high integration make it ideal for production line applications and automated testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is an overall circuit diagram of the voltage and current meter module of the present utility model.

[0035] Figure 2 This is a circuit diagram of the first voltage measuring unit of the voltage and current meter module of the present invention.

[0036] Figure 3 This is a circuit diagram of the second voltage measuring part of the voltage and current meter module of the present invention.

[0037] Figure 4 The utility model is a circuit diagram of a range selection module of a current measurement section of a voltage and current meter module.

[0038] Figure 5 This is a circuit diagram of an amplifier module of the current measurement section of the voltage and current meter module of the present invention.

[0039] Figure 6 The utility model is a circuit diagram of the analog-to-digital conversion part of the voltage and current meter module.

[0040] Figure 7 This is a circuit diagram of the SPI signal isolation module of the voltage and current meter module of the utility model.

[0041] Figure 8 It is a circuit diagram of the IIC isolation module of the voltage and current meter module of the utility model. DETAILED DESCRIPTION

[0042] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict.

[0043] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. In addition, the terms "upper," "lower," "left," "right," "top," and "bottom" used in this utility model are merely relative to the relative positions of the components of the utility model in the accompanying drawings.

[0044] In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used in this specification are only for describing specific embodiments and are not intended to limit the present invention. The term "and / or" as used herein includes any combination of one or more of the related listed items.

[0045] It should be understood that although the terms first, second, third, etc. may be used to describe various elements in the present disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, a first element may also be referred to as a second element, and similarly, a second element may also be referred to as a first element without departing from the scope of the present disclosure.

[0046] Reference Figures 1 to 8 In this application, a voltage and current meter module is proposed, comprising:

[0047] a first voltage measuring unit, configured to measure a voltage value of a first voltage channel;

[0048] a second voltage measuring unit, configured to measure a voltage value of a second voltage channel;

[0049] a current measuring unit, the current measuring unit being configured to measure an input current value, wherein an output of the current measuring unit is connected to an input of the second voltage measuring unit;

[0050] The analog-to-digital conversion unit has outputs of the first voltage measuring unit and the second voltage measuring unit connected to inputs of the analog-to-digital conversion unit, respectively.

[0051] The beneficial effects of the present utility model are as follows:

[0052] This application proposes a 24-bit, 250kSPS, highly integrated multimeter module. It can conveniently measure dual-channel ±5V voltage and single-channel currents of ±2mA and ±100uA simultaneously. This module is a powerful tool for electronic component design, inspection, quality control, and production testing. Its compact size and high integration make it ideal for production line applications and automated testing.

[0053] Further, refer to Figure 2 The first voltage measuring unit includes an 800-th amplifier U800, an 800-th resistor R800, an 810-th resistor R801, an 801-th resistor R810, an 803-th resistor R803, an 800-th capacitor C800, an 801-th capacitor C801, an 802-th capacitor C802, an 803-th capacitor C803, an 802-th resistor R802, an 804-th resistor R804, and an 801-A amplifier U801-A;

[0054] The first end of the first measured voltage is connected to the first end of the eighth zero resistor R800 and the first end of the eighth zero resistor R801 respectively, the second end of the eighth zero resistor R801 is connected to the first end of the eighth zero resistor R810, and the second end of the eighth zero resistor R810 and the first end of the eighth zero resistor R803 are connected to the second end of the first measured voltage respectively.

[0055] The second end of the eighth zero-zero resistor R800, the first end of the eighth zero-zero capacitor C800, and the first end of the eighth zero-one capacitor C801 are respectively connected to the non-inverting input terminal of the eighth zero-zero amplifier U800, the second end of the eighth zero-zero capacitor C800 is connected to the first end of the eighth zero-two capacitor C802, the second end of the eighth zero-two capacitor C802, the second end of the eighth zero-three resistor R803, and the second end of the eighth zero-one capacitor C801 are respectively connected to the inverting input terminal of the eighth zero-zero amplifier U800.

[0056] The output end of the 800 amplifier U800 and the first end of the 802 resistor R802 are respectively connected to the input of the analog-to-digital conversion unit, the second end of the 802 resistor R802, the first end of the 803 capacitor C803 and the first end of the 804 resistor R804 are respectively connected to the inverting input end of the 801A amplifier U801-A, the reference voltage end of the 800 amplifier U800, the second end of the 803 capacitor C803, the second end of the 804 resistor R804 and the output end of the 801A amplifier U801-A are respectively connected to the input end of the analog-to-digital conversion unit, and the non-inverting input end of the 801A amplifier U801-A is connected to the reference voltage.

[0057] Further, refer to Figure 3 The second voltage measuring unit includes an 802nd amplifier U802, an 805th resistor R805, an 811th resistor R811, an 806th resistor R806, an 808th resistor R808, an 804th capacitor C804, an 805th capacitor C805, an 806th capacitor C806, an 807th capacitor C807, an 807th resistor R807, an 809th resistor R809, and an 801st-B amplifier U801-B;

[0058] The first end of the second measured voltage is connected to the first end of the eighth resistor R805 and the first end of the eighth resistor R811, respectively. The second end of the eighth resistor R811 is connected to the first end of the eighth resistor R806. The second end of the eighth resistor R806 and the first end of the eighth resistor R808 are connected to the second end of the second measured voltage, respectively.

[0059] The second end of the eighth resistor R805, the first end of the eighth capacitor C804, and the first end of the eighth capacitor C805 are respectively connected to the non-inverting input terminal of the eighth amplifier U802, the second end of the eighth capacitor C804 is connected to the first end of the eighth capacitor C806, the second end of the eighth capacitor C806, the second end of the eighth resistor R808, and the second end of the eighth capacitor C805 are respectively connected to the inverting input terminal of the eighth amplifier U802.

[0060] The output end of the 802 amplifier U802 and the first end of the 807 resistor R807 are respectively connected to the input of the analog-to-digital conversion unit, the second end of the 807 resistor R807, the first end of the 807 capacitor C807 and the first end of the 809 resistor R809 are respectively connected to the inverting input end of the 801-B amplifier U801-B, the reference voltage end of the 802 amplifier U802, the second end of the 807 capacitor C807, the second end of the 809 resistor R809 and the output end of the 801-B amplifier U801-B are respectively connected to the input end of the analog-to-digital conversion unit, and the non-inverting input end of the 801-B amplifier U801-B is connected to the reference voltage.

[0061] Further, refer to Figure 4 and Figure 5 The current measuring unit includes a range selection module and an amplification module connected in sequence.

[0062] Further, refer to Figure 4 The range selection module includes a first relay K1001, a first resistor R1001, a first resistor R1003, a first resistor R1004 and a first switching diode D1000.

[0063] The first end of the first 0001 resistor R1001 and the third end of the first 0000 switching diode D1000 are respectively connected to the input end of the measured current, the second end of the first 0001 resistor R1001, the first 003 resistor R1003, the first 004 resistor R1004 and the first end and second end of the first 0000 switching diode D1000 are connected in sequence, the third input end and the fifth input end of the first 0001 relay K1001 are respectively connected to the first end and second end of the first 0000 switching diode D1000, the second input end and the seventh input end of the first 001 relay K1001 are connected to the first end of the first 003 resistor R1003, the eighth input end of the first 001 relay K1001 is the control end, and the third end and the sixth end of the first 001 relay K1001 are the selected current output ends.

[0064] Further, refer to Figure 5 The amplification module includes a first amplifier U1000, a first resistor R1005, a first resistor R1006, a first resistor R1009, a first capacitor C1004, a first capacitor C1006, a first capacitor C1005, a first resistor R1007, and a first resistor R1008.

[0065] The first end of the first zero-zero five resistor R1005 and the first end of the first zero-zero six resistor R1006 are respectively connected to the third end of the first zero-zero one relay K1001, the second end of the first zero-zero six resistor R1006 and the first end of the first zero-zero nine resistor R1009 are respectively connected to the third end of the first zero-zero zero switch diode D1000, the second end of the first zero-zero four capacitor C1004 is connected to the first end of the first zero-zero six capacitor C1006, the second end of the first zero-zero five resistor R1005 and the first zero-zero four capacitor C1004 are respectively connected to the third end of the first zero-zero zero switch diode D1000, The first end and the first end of the first 005 capacitor C1005 are respectively connected to the non-inverting input terminal of the first 0000 amplifier U1000, the second end of the first 009 resistor R1009, the second end of the first 006 capacitor C1006 and the second end of the first 005 capacitor C1005 are respectively connected to the inverting input terminal of the first 0000 amplifier U1000, and the two ends of the first 007 resistor R1007 and the first 008 resistor R1008 connected in parallel are respectively connected to the two input terminals of the reference voltage of the first 0000 amplifier U1000.

[0066] Further, refer to Figure 6The analog-to-digital conversion unit includes a seventh analog-to-digital converter U700, a first voltage input module, a second voltage input module, a bias voltage input module, an output module, a power input module, and a crystal oscillator module, wherein the first voltage input module, the second voltage input module, the bias voltage input module, and the output module are respectively connected to the seventh analog-to-digital converter U700;

[0067] The first voltage input module includes a seventh zero-th diode D700, a seventh zero-th diode D701, a seventh zero-th capacitor C701, a seventh zero-th capacitor C700, a seventh zero-th capacitor C702, a seventh zero-th resistor R701, a seventh zero-th resistor R702, a seventh zero-th resistor R700, and a seventh zero-th resistor R703.

[0068] The third end of the seven-zeroth diode D700, the first end of the seven-zeroth capacitor C701, the first end of the seven-zeroth capacitor C700, the first end of the seven-zeroth resistor R701, and the first end of the seven-zeroth resistor R700 are respectively connected to the AIN0 terminal of the seven-zeroth analog-to-digital converter U700; the third end of the seven-zeroth diode D701, the second end of the seven-zeroth capacitor C701, the second end of the seven-zeroth capacitor C702, the second end of the seven-zeroth resistor R702, and the first end of the seven-zeroth resistor R703 are respectively connected to the AIN1 terminal of the seven-zeroth analog-to-digital converter U700; the second end of the seven-zeroth resistor R700 and the second end of the seven-zeroth resistor R703 are respectively connected to the output of the first voltage measuring unit;

[0069] The second voltage input module includes a seventy-second diode D702, a seventy-third diode D703, a seventy-ninth capacitor C709, a seventy-fourth capacitor C704, a seventy-first capacitor C710, a seventy-fifth resistor R705, a seventy-sixth resistor R706, a seventy-fourth resistor R704, and a seventy-seventh resistor R707.

[0070] The third end of the seventy-second diode D702, the first end of the seventy-ninth capacitor C709, the first end of the seventy-fourth capacitor C704, the first end of the seventy-fifth resistor R705 and the first end of the seventy-fourth resistor R704 are respectively connected to the AIN2 end of the seventy-zero analog-to-digital converter U700, the third end of the seventy-third diode D703, the second end of the seventy-ninth capacitor C709, the second end of the seventy-first capacitor C710, the second end of the seventy-sixth resistor R706 and the first end of the seventy-seventh resistor R707 are respectively connected to the AIN3 end of the seventy-zero analog-to-digital converter U700, and the second end of the seventy-fourth resistor R704 and the second end of the seventy-seventh resistor R707 are respectively connected to the output of the second voltage measuring unit.

[0071] Further, refer to Figure 6 The bias voltage input module includes a seventy-first voltage reference chip U701, a seventy-seventh capacitor C717, a seventy-eighth capacitor C718, a seventy-nineth capacitor C719, a seventy-twentieth capacitor C720, a seventy-eighth resistor R708, a seventy-ninth resistor R709, a seventy-zeroth resistor R710, and a seventy-sixth capacitor C716.

[0072] The VIN terminal of the seventy-first voltage reference chip U701 is connected to the power supply, the VIN terminal of the seventy-first voltage reference chip U701 is connected to the GND terminal of the seventy-first voltage reference chip U701 through the seventy-seventh capacitor C717 and the seventy-eighth capacitor C718 connected in parallel, and the VOUT terminal of the seventy-first voltage reference chip U701 is connected to the analog ground through the seventy-nineth capacitor C719 and the seventy-twentieth capacitor C720 connected in parallel. The VOUT terminal of the reference chip U701 is connected to the REF+ terminal of the seventy-zero analog-to-digital converter U700, and also includes the REF+ terminal of the seventy-zero analog-to-digital converter U700, the seventy-eighth resistor R708, the seventy-ninth resistor R709 and the seventy-first resistor R710 connected in sequence, the first end of the seventy-sixth capacitor C716 is connected to the first end of the seventy-ninth resistor R709, and the second end of the seventy-sixth capacitor C716 is connected to the second end of the seventy-first resistor R710.

[0073] Further, refer to Figure 6 The output module includes an SPI_DIN output terminal connected to the DIN terminal of the seventh zeroth analog-to-digital converter U700, an SPI_DOUT output terminal connected to the DOUT terminal of the seventh zeroth analog-to-digital converter U700, an SPI_CLK output terminal connected to the SCLK terminal of the seventh zeroth analog-to-digital converter U700, and an SPI_CS output terminal connected to the CS terminal of the seventh zeroth analog-to-digital converter U700.

[0074] Further, refer to Figure 7 and Figure 8 , further comprising a signal isolation unit, wherein the signal isolation unit comprises an SPI signal isolation module for SPI signal isolation and an IIC isolation module for IIC isolation,

[0075] The SPI signal isolation module includes a 401 signal isolator U401, and the IIC isolation module includes a 400 signal isolator U400.

[0076] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the aforementioned embodiments. As long as the technical effects of the present invention are achieved by the same means, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure. Within the scope of protection of the present invention, its technical solutions and / or implementation methods may be modified and varied in various ways.

Claims

1. A voltage and current meter module, characterized in that: include: a first voltage measuring unit, configured to measure a voltage value of a first voltage channel; a second voltage measuring unit, configured to measure a voltage value of a second voltage channel; a current measuring unit, the current measuring unit being configured to measure an input current value, wherein an output of the current measuring unit is connected to an input of the second voltage measuring unit; The analog-to-digital conversion unit has outputs of the first voltage measuring unit and the second voltage measuring unit connected to inputs of the analog-to-digital conversion unit, respectively.

2. The voltage and current meter module according to claim 1, characterized in that: The first voltage measuring unit includes an 800th amplifier (U800), an 800th resistor (R800), an 810th resistor (R801), an 801st resistor (R810), an 803rd resistor (R803), an 800th capacitor (C800), an 801st capacitor (C801), an 802nd capacitor (C802), an 803rd capacitor (C803), an 802nd resistor (R802), an 804th resistor (R804) and an 801A amplifier (U801-A); The first end of the first measured voltage is connected to the first end of the eighth zero resistor (R800) and the first end of the eighth zero resistor (R801), the second end of the eighth zero resistor (R801) is connected to the first end of the eighth zero resistor (R810), the second end of the eighth zero resistor (R810) and the first end of the eighth zero resistor (R803) are connected to the second end of the first measured voltage, The second end of the eighth zero-zero resistor (R800), the first end of the eighth zero-zero capacitor (C800) and the first end of the eighth zero-one capacitor (C801) are respectively connected to the non-inverting input end of the eighth zero-zero amplifier (U800), the second end of the eighth zero-zero capacitor (C800) is connected to the first end of the eighth zero-two capacitor (C802), the second end of the eighth zero-two capacitor (C802), the second end of the eighth zero-three resistor (R803) and the second end of the eighth zero-one capacitor (C801) are respectively connected to the inverting input end of the eighth zero-zero amplifier (U800), The output end of the eighth zero amplifier (U800) and the first end of the eighth zero resistor (R802) are respectively connected to the input of the analog-to-digital conversion unit, the second end of the eighth zero resistor (R802), the first end of the eighth zero capacitor (C803) and the first end of the eighth zero resistor (R804) are respectively connected to the inverting input end of the eighth zero amplifier (U801-A), the reference voltage end of the eighth zero amplifier (U800), the second end of the eighth zero capacitor (C803), the second end of the eighth zero resistor (R804) and the output end of the eighth zero amplifier (U801-A) are respectively connected to the input end of the analog-to-digital conversion unit, and the non-inverting input end of the eighth zero amplifier (U801-A) is connected to the reference voltage.

3. The voltage and current meter module according to claim 1, characterized in that: The second voltage measuring unit includes an 802nd amplifier (U802), an 805th resistor (R805), an 811th resistor (R811), an 806th resistor (R806), an 808th resistor (R808), an 804th capacitor (C804), an 805th capacitor (C805), an 806th capacitor (C806), an 807th capacitor (C807), an 807th resistor (R807), an 809th resistor (R809) and an 801-B amplifier (U801-B); The first end of the second measured voltage is connected to the first end of the eighth resistor (R805) and the first end of the eighth resistor (R811), respectively; the second end of the eighth resistor (R811) is connected to the first end of the eighth resistor (R806), and the second end of the eighth resistor (R806) and the first end of the eighth resistor (R808) are connected to the second end of the second measured voltage, respectively. The second end of the eighth resistor (R805), the first end of the eighth capacitor (C804) and the first end of the eighth capacitor (C805) are respectively connected to the non-inverting input terminal of the eighth amplifier (U802), the second end of the eighth capacitor (C804) is connected to the first end of the eighth capacitor (C806), the second end of the eighth capacitor (C806), the second end of the eighth resistor (R808) and the second end of the eighth capacitor (C805) are respectively connected to the inverting input terminal of the eighth amplifier (U802). The output end of the 802 amplifier (U802) and the first end of the 807 resistor (R807) are respectively connected to the input of the analog-to-digital conversion unit, the second end of the 807 resistor (R807), the first end of the 807 capacitor (C807) and the first end of the 809 resistor (R809) are respectively connected to the inverting input end of the 801B amplifier (U801-B), the reference voltage end of the 802 amplifier (U802), the second end of the 807 capacitor (C807), the second end of the 809 resistor (R809) and the output end of the 801B amplifier (U801-B) are respectively connected to the input end of the analog-to-digital conversion unit, and the non-inverting input end of the 801B amplifier (U801-B) is connected to the reference voltage.

4. The voltage and current meter module according to claim 1, characterized in that: The current measuring unit includes a range selection module and an amplification module which are connected in sequence.

5. The voltage and current meter module according to claim 4, characterized in that: The range selection module includes a first-million-first relay (K1001), a first-million-first resistor (R1001), a first-million-third resistor (R1003), a first-million-fourth resistor (R1004) and a first-million-second switching diode (D1000). The first end of the first zero-zero-one resistor (R1001) and the third end of the first zero-zero-zero switching diode (D1000) are respectively connected to the input end of the measured current; the second end of the first zero-zero-one resistor (R1001), the first zero-zero-three resistor (R1003), the first zero-zero-four resistor (R1004) and the first end and the second end of the first zero-zero-zero switching diode (D1000) are connected in sequence; the third input end and the fifth input end of the first zero-zero-one relay (K1001) are respectively connected to the first end and the second end of the first zero-zero-zero switching diode (D1000); the second input end and the seventh input end of the first zero-zero-one relay (K1001) are connected to the first end of the first zero-zero-three resistor (R1003); the eighth input end of the first zero-zero-one relay (K1001) is a control end; and the third end and the sixth end of the first zero-zero-one relay (K1001) are selected current output ends.

6. The voltage and current meter module according to claim 4, characterized in that: The amplification module includes a first-zero-zero amplifier (U1000), a first-zero-fifth resistor (R1005), a first-zero-sixth resistor (R1006), a first-zero-ninth resistor (R1009), a first-zero-fourth capacitor (C1004), a first-zero-sixth capacitor (C1006), a first-zero-fifth capacitor (C1005), a first-zero-seventh resistor (R1007) and a first-zero-eighth resistor (R1008). The first end of the first zero-zero fifth resistor (R1005) and the first end of the first zero-zero sixth resistor (R1006) are respectively connected to the third end of the first zero-zero first relay (K1001), the second end of the first zero-zero sixth resistor (R1006) and the first end of the first zero-zero ninth resistor (R1009) are respectively connected to the third end of the first zero-zero switching diode (D1000), the second end of the first zero-zero fourth capacitor (C1004) is connected to the first end of the first zero-zero sixth capacitor (C1006), the second end of the first zero-zero fifth resistor (R1005) and the first end of the first zero-zero fourth capacitor (C1004) are respectively connected to the third end of the first zero-zero sixth capacitor (C1006). One end and the first end of the first 005 capacitor (C1005) are respectively connected to the non-inverting input end of the first 0000 amplifier (U1000), the second end of the first 009 resistor (R1009), the second end of the first 006 capacitor (C1006) and the second end of the first 005 capacitor (C1005) are respectively connected to the inverting input end of the first 0000 amplifier (U1000), and the two ends of the first 007 resistor (R1007) and the first 008 resistor (R1008) connected in parallel are respectively connected to the two input ends of the reference voltage of the first 0000 amplifier (U1000).

7. The voltage and current meter module according to claim 1, characterized in that: The analog-to-digital conversion unit comprises a seventh analog-to-digital converter (U700), a first voltage input module, a second voltage input module, a bias voltage input module, an output module, a power input module and a crystal oscillator module, wherein the first voltage input module, the second voltage input module, the bias voltage input module and the output module are respectively connected to the seventh analog-to-digital converter (U700); The first voltage input module includes a seventh zero-th diode (D700), a seventh zero-th diode (D701), a seventh zero-th capacitor (C701), a seventh zero-th capacitor (C700), a seventh zero-th capacitor (C702), a seventh zero-th resistor (R701), a seventh zero-th resistor (R702), a seventh zero-th resistor (R700), and a seventh zero-th resistor (R703). The third end of the seventy-zero diode (D700), the first end of the seventy-first capacitor (C701), the first end of the seventy-zero capacitor (C700), the first end of the seventy-first resistor (R701) and the first end of the seventy-zero resistor (R700) are respectively connected to the AIN0 end of the seventy-zero analog-to-digital converter (U700); the third end of the seventy-first diode (D701), the second end of the seventy-first capacitor (C701), the second end of the seventy-second capacitor (C702), the second end of the seventy-second resistor (R702) and the first end of the seventy-third resistor (R703) are respectively connected to the AIN1 end of the seventy-zero analog-to-digital converter (U700); the second end of the seventy-zero resistor (R700) and the second end of the seventy-third resistor (R703) are respectively connected to the output of the first voltage measuring unit; The second voltage input module includes a seventy-second diode (D702), a seventy-third diode (D703), a seventy-ninth capacitor (C709), a seventy-fourth capacitor (C704), a seventy-first capacitor (C710), a seventy-fifth resistor (R705), a seventy-sixth resistor (R706), a seventy-fourth resistor (R704), and a seventy-seventh resistor (R707). The third end of the seventy-second diode (D702), the first end of the seventy-ninth capacitor (C709), the first end of the seventy-fourth capacitor (C704), the first end of the seventy-fifth resistor (R705) and the first end of the seventy-fourth resistor (R704) are respectively connected to the AIN2 end of the seventy-zero analog-to-digital converter (U700), the third end of the seventy-third diode (D703), the second end of the seventy-ninth capacitor (C709), the second end of the seventy-first capacitor (C710), the second end of the seventy-sixth resistor (R706) and the first end of the seventy-seventh resistor (R707) are respectively connected to the AIN3 end of the seventy-zero analog-to-digital converter (U700), and the second end of the seventy-fourth resistor (R704) and the second end of the seventy-seventh resistor (R707) are respectively connected to the output of the second voltage measuring unit.

8. The voltage and current meter module according to claim 7, characterized in that: The bias voltage input module includes a seventy-first voltage reference chip (U701), a seventy-seventh capacitor (C717), a seventy-eighth capacitor (C718), a seventy-nineth capacitor (C719), a seventy-twentieth capacitor (C720), a seventy-eighth resistor (R708), a seventy-ninth resistor (R709), a seventy-first resistor (R710) and a seventy-sixth capacitor (C716). The VIN terminal of the seventy-first voltage reference chip (U701) is connected to the power supply, the VIN terminal of the seventy-first voltage reference chip (U701) is connected in parallel through the seventy-seventh capacitor (C717) and the seventy-eighth capacitor (C718) and then connected to the GND terminal of the seventy-first voltage reference chip (U701), the VOUT terminal of the seventy-first voltage reference chip (U701) is connected in parallel through the seventy-nineth capacitor (C719) and the seventy-twentieth capacitor (C720) and then connected to the analog ground, and the seventy-first voltage reference The VOUT terminal of the chip (U701) is connected to the REF+ terminal of the seventh-zeroth analog-to-digital converter (U700), and also includes the REF+ terminal of the seventh-zeroth analog-to-digital converter (U700), the seventh-zeroth resistor (R708), the seventh-zeroth resistor (R709) and the seventh-zeroth resistor (R710) connected in sequence, the first end of the seventh-zeroth capacitor (C716) is connected to the first end of the seventh-zeroth resistor (R709), and the second end of the seventh-zeroth capacitor (C716) is connected to the second end of the seventh-zeroth resistor (R710).

9. The voltage and current meter module according to claim 7, characterized in that: The output module comprises an SPI_DIN output terminal connected to the DIN terminal of the seventh zeroth analog-to-digital converter (U700), an SPI_DOUT output terminal connected to the DOUT terminal of the seventh zeroth analog-to-digital converter (U700), an SPI_CLK output terminal connected to the SCLK terminal of the seventh zeroth analog-to-digital converter (U700), and an SPI_CS output terminal connected to the CS terminal of the seventh zeroth analog-to-digital converter (U700).

10. The voltage and current meter module according to claim 1, characterized in that: It also includes a signal isolation unit, which includes an SPI signal isolation module for SPI signal isolation and an IIC isolation module for IIC isolation. The SPI signal isolation module includes a 401 signal isolator (U401), and the IIC isolation module includes a 400 signal isolator (U400).

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