High-precision analog-to-digital converter apparatus for detecting gases from thermal degradation of cable

Abstract

The present invention relates to the field of analog-to-digital converters. Disclosed is a high-precision analog-to-digital converter apparatus for detecting gases from the thermal degradation of a cable. The apparatus comprises: an input module, which is used for receiving an external analog signal; a timing control module, which is used for providing a system clock signal to control an analog-to-digital conversion process; a comparison and conversion module, which is used for implementing a successive approximation algorithm to approximate the numerical value of an input signal by means of comparison and conversion; a sampling and holding module, which is used for sampling and holding the input signal; a reference and output module, which is used for providing a stable reference voltage, and outputting a final digital conversion result; and a register module, which is used for storing and configuring parameters of each module. The high-precision analog-to-digital converter apparatus provided in the present invention has the advantages of high precision, high efficiency, good real-time performance, high flexibility, etc., thereby effectively improving the detection precision and detection efficiency for gases from the thermal degradation of a cable.

Description

High-precision analog-to-digital converter device for cable thermal degradation gas detection TECHNICAL FIELD

[0001] The present application relates to the technical field of analog-to-digital converters, in particular to a high-precision analog-to-digital converter device for cable thermal degradation gas detection. BACKGROUND

[0002] Cables may release harmful gases due to thermal degradation during long-term operation or under specific environmental conditions. The types and concentrations of these gases can reflect the degree of thermal degradation of the cable, which is of great significance for predicting the service life of the cable and preventing potential safety hazards. Therefore, cable thermal degradation gas detection devices have emerged, which assess the state of the cable by detecting the gases released by the cable.

[0003] However, the gases released during cable thermal degradation often have low concentrations and complex compositions, which requires the detection device to have extremely high sensitivity and accuracy. High-precision analog-to-digital converters (ADCs), as key devices for converting analog signals to digital signals, directly determine the accuracy and reliability of the detection device. Therefore, high-precision ADCs play an irreplaceable role in the field of cable thermal degradation detection. SUMMARY

[0004] In view of the problems existing in the prior art, the present application is proposed.

[0005] Therefore, the problem to be solved by the present application is how to improve the sensitivity and accuracy of cable thermal degradation gas detection through a high-precision analog-to-digital converter.

[0006] To solve the above technical problems, the present application provides the following technical solution: a high-precision analog-to-digital converter device for cable thermal degradation gas detection, comprising an input module for receiving external analog signals; a timing control module for providing a system clock signal and controlling the analog-to-digital conversion process; a comparison and conversion module for implementing a successive approximation algorithm and approximating the value of the input signal through comparison and conversion; a sampling and holding module for sampling and holding the input signal; a reference and output module for providing a stable reference voltage and outputting the final digital conversion result; and a register module for storing and configuring the parameters of each module.

[0007] As a preferred embodiment of the high-precision analog-to-digital converter device for cable thermal degradation gas detection according to the present application, the comparison and conversion module comprises a comparator and an analog-to-digital conversion module, the sampling and holding module comprises a sampling module and a holding module, and the reference and output module comprises a reference module and an output module.

[0008] As a preferred scheme of the high-precision analog-to-digital converter device for cable thermal degradation gas detection, the output end of the input module is connected with the positive end of the comparator, the negative end of the comparator is connected with the output end to form a negative feedback, the output end of the comparator is connected with the input end of the sampling module, the output end of the sampling module is connected with the input end of the holding module, the output end of the holding module is connected with the input end of the analog-to-digital conversion module, the output ends of the timing control module and the reference module are respectively connected with the input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module is connected with the input end of the output module.

[0009] As a preferred scheme of the high-precision analog-to-digital converter device for cable thermal degradation gas detection, the input module includes pins AIN0-AIN16, a DAC pin, an AVCC / 3 pin, a temperature sensor pin, and a 1.2V reference voltage pin, which are used to receive different external sampling signal voltages.

[0010] As a preferred scheme of the high-precision analog-to-digital converter device for cable thermal degradation gas detection, the timing control module includes PCLK pins, PCLK / 2 pins, PCLK / 4 pins, and PCLK / 8 pins, which are used to select different pin positions to provide different frequency clock signals for the chip.

[0011] As a preferred scheme of the high-precision analog-to-digital converter device for cable thermal degradation gas detection, the reference module includes 1.5V pins, 2.5V pins, ExRef pins, and AVCC pins, which are used to receive external reference voltage signals.

[0012] As a preferred scheme of the high-precision analog-to-digital converter device for cable thermal degradation gas detection, the output module includes SqrResult0-15 modules, JqrResult0-3 modules, and ADC_ResultAcc modules, which are used to obtain different analog-to-digital conversion output results.

[0013] As a preferred scheme of the high-precision analog-to-digital converter device for cable thermal degradation gas detection, the analog-to-digital conversion module performs analog-to-digital conversion through a successive approximation method, wherein 4-12 clock signals are required for the conversion process, and 16 clock signals are required for the successive comparison process.

[0014] As a preferred scheme of the high-precision analog-to-digital converter device for cable thermal degradation gas detection, the analog-to-digital conversion module can be configured with an external trigger source through the register module to start the analog-to-digital conversion module for single conversion or sequential scanning conversion.

[0015] As a preferred scheme of the high-precision analog-to-digital converter device for cable thermal degradation gas detection, the analog-to-digital conversion module has upper threshold comparison, lower threshold comparison and interval value comparison functions, and triggers corresponding interrupts when the conversion result reaches the set threshold.

[0016] The high-precision analog-to-digital converter device has the advantages of high precision, high efficiency, strong real-time performance, flexibility and the like, and effectively improves the detection precision and monitoring efficiency of cable thermal degradation gas. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Fig. 1 is a schematic diagram of the analog-to-digital converter device design.

[0019] Fig. 2 is a conversion timing diagram of the analog-to-digital conversion module.

[0020] Fig. 3 is a schematic diagram of the external trigger source for single conversion or sequential scanning conversion.

[0021] Fig. 4 is a schematic diagram of the analog-to-digital conversion using sequential scanning mode conversion process.

[0022] Fig. 5 is an example of the analog-to-digital continuous conversion accumulation process.

[0023] Fig. 6 is a schematic diagram of the analog-to-digital conversion result comparison. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0025] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the scope of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0026] Second, the "one embodiment" or "an embodiment" referred to herein can include a particular feature, structure, or characteristic. The various embodiments appearing at different places in this specification can not all refer to the same embodiment, nor are separate embodiments mutually exclusive of one another.

[0027] Embodiment 1

[0028] Referring to FIG. 1-6, a first embodiment of the present application provides a high-precision analog-to-digital converter device for cable thermal degradation gas detection, which includes an input module 100, a timing control module 200, a comparison and conversion module 300, a sampling and holding module 400, a reference and output module 500, and a register module.

[0029] Specifically, the comparison and conversion module 300 includes a comparator 301 and an analog-to-digital conversion module 302, the sampling and holding module 400 includes a sampling module 401 and a holding module 402, and the reference and output module 500 includes a reference module 501 and an output module 502.

[0030] The output end of the input module 100 is connected to the positive end of the comparator 301, the negative end of the comparator 301 is connected to its output end to form a negative feedback, the output end of the comparator 301 is connected to the input end of the sampling module 401, the output end of the sampling module 401 is connected to the input end of the holding module 402, the output end of the holding module 402 is connected to the input end of the analog-to-digital conversion module 302, the output ends of the timing control module 200 and the reference module 501 are respectively connected to the input end of the analog-to-digital conversion module 302, and the output end of the analog-to-digital conversion module 302 is connected to the input end of the output module 502, as shown in FIG. 1.

[0031] Preferably, the input module 100 includes pins AIN0-AIN16, a pin DAC, a pin AVCC / 3, a temperature sensor pin, and a 1.2V reference voltage pin, wherein the pins AIN0-AIN16 are responsible for receiving external sampling signal voltages, the pin DAC and the pin AVCC / 3 are connected to an external AVCC divided voltage, the temperature sensor pin is connected to an external temperature sensor output end, and the 1.2V reference voltage pin is connected to an external 1.2V reference voltage signal.

[0032] Preferably, the timing control module 200 includes PCLK pins, PCLK / 2 pins, PCLK / 4 pins, and PCLK / 8 pins, which can select different pin positions to provide different frequency clock signals inside the chip.

[0033] Preferably, the reference module 501 comprises a 1.5V pin, a 2.5V pin, an ExRef pin and an AVCC pin, the 1.5V pin is connected with an external input 1.5V voltage signal, the 2.5V pin is connected with an external input 2.5V voltage signal, and the ExRef pin and the AVCC pin are reference voltage pins.

[0034] The output module 502 comprises SqrResult0-15 modules, JqrResult0-3 modules and ADC_ResultAcc modules, and different ADC output results can be obtained according to the output requirements.

[0035] Further, as shown in FIG. 2, one complete ADC conversion is composed of a conversion process and a successive comparison process. The conversion process needs 4-12 ADCCLKs, which are configured by ADC_CR0.SAM; the successive comparison process needs 16 ADCCLKs.

[0036] Therefore, one ADC conversion needs 20-28 ADCCLKs in total. The unit of the ADC conversion speed is SPS, i.e. how many times of ADC conversion per second. The calculation method of the ADC conversion speed is: the frequency of ADCCLK / the number of ADCCLKs needed for one ADC conversion.

[0037] As shown in Table 1, it is a conversion speed table of the analog-digital converter device of the present application. The ADC conversion speed is related to the ADC reference voltage and the AVCC voltage, and the highest conversion speed can reach 1MSPS.

[0038] Table 1 Conversion speed table of the analog-digital converter device of the present application

[0039] Further, as shown in FIG. 3, it is an external trigger source diagram for single conversion or sequential scanning conversion in the analog-digital conversion module 302. The ADC_ExtTrigger0 register can be configured to set the external trigger source for single conversion or sequential scanning conversion of the ADC. Among them, the PC15 interrupt signal and the ADC_ExtTrigger0

[0031] signal get output 1 through an AND gate, the PB15 interrupt and the ADC_ExtTrigger0

[0030] get output 2 through an AND gate, and so on, finally the GTIM2_TRARADC signal and the ADC_ExtTrigger0[1] signal get output 31 through an OR gate, and the GTIM1_TRADC signal and the ADC_ExtTrigger0[0] get output 32 through an AND gate. Among them, the output 1 to the output 32 are input as OR gates, and the output is connected with the external trigger source.

[0040] Further, as shown in Fig. 4, a schematic diagram of the sequential scan conversion mode of the present application is shown. The sequential scan conversion mode can perform 16 continuous conversions at most, and the total number of conversions is configured by ADC_SQR2.CNT; all 22 channels can be configured to perform conversion, and the channels to be converted are configured by ADC_SQRx.CHxMux. This mode can be started by setting the ADC_SqrStart.Start bit or by setting the external trigger of ADC_ExtTrigger0.

[0041] After starting the conversion, the ADC module converts the channels configured in CHxMux~CH0Mux in sequence until the total number of conversions is completed. After the ADC module completes the total number of conversions, the ADC_IFR.SQRIF bit is automatically set to 1, and the conversion results are saved in the ADC_SqrResultx~ADC_SqrResult0 registers corresponding to the conversion channels. Fig. 4 demonstrates the sequential scan conversion process of 8 conversions on AIN0, AIN1, and AIN5. Among them, the sequential scan conversion channels 7, 4, and 1 are configured as AIN1, the conversion channels 6, 3, and 0 are configured as AIN0, and the conversion channels 5 and 2 are configured as AIN5. After setting the ADC_SqrStart.Start bit to 1, the ADC module will sequentially convert the sequential scan conversion channels 7~0.

[0042] The ADC sequential scan conversion operation process started by the ADC_SqrStart.Start bit is as follows:

[0043] Step 1: Configure the corresponding bits of PAADS~PEADS to configure the ADC channels to be converted as analog ports.

[0044] Step 2: Set PBADS.bit1 to 1 to configure the ADC external reference voltage pin as an analog port.

[0045] Note: If the ADC reference voltage does not select the external reference voltage pin, this step can be skipped.

[0046] Step 3: Set BGR_CR.BGR_EN to 1 to enable the BGR module.

[0047] Step 4: Set ADC_CR0.En to 1 to enable the ADC module.

[0048] Step 5: Delay for 20us to wait for the completion of the start of the ADC and BGR modules.

[0049] Step 6: Set ADC_CR1.Mode to 1 to select the scan conversion mode.

[0050] Step 7: Configure ADC_CR0.Ref, select the reference voltage of ADC.

[0051] Step 8: Set ADC_CR0.InRefEn to 1, enable the internal reference voltage of ADC.

[0052] Note: If the reference voltage of ADC is not selected as the internal reference voltage, this step can be skipped.

[0053] Step 9: Configure ADC_CR0.SAM and ADC_CR0.CkDiv, set the conversion speed of ADC.

[0054] Step 10: Configure ADC_SQRx.CHxMux, select the conversion channel of sequential scan.

[0055] Step 11: Configure ADC_SQR2.CNT, select the total number of conversions of sequential scan.

[0056] Note: The total number of conversions should be consistent with the number of conversion channels configured in Step 10.

[0057] Step 12: Set ADC_ICR.SQRIC to 0, clear the ADC_IFR.SQRIF flag.

[0058] Step 13: Set ADC_SqrStart.Start to 1, start the ADC sequential scan conversion.

[0059] Step 14: Wait for ADC_IFR.SQRIF to become 1, read the ADC_SqrResultx-ADC_SqrResult0 registers to obtain the conversion results of the corresponding channels.

[0060] Step 15: If you need to convert other channels, repeat Steps 10-14.

[0061] Step 16: Set ADC_CR0.En and BGR_CR.BGR_EN to 0, turn off the ADC module and BGR module.

[0062] Further, as shown in Figure 5, a schematic diagram of the continuous conversion accumulation mode of the analog-to-digital conversion of the application is shown. In the continuous conversion accumulation mode, a single start of the ADC can perform multiple conversions on multiple channels and accumulate the results of each conversion; all 22 channels can be configured to perform conversions. The total number of conversions is configured by ADC_SQR2.CNT; the channels to be converted are configured by ADC_SQRx.CHxMux. This mode can be started by setting the ADC_SqrStart.Start bit or by setting the external trigger of ADC_ExtTrigger0.

[0063] After starting the continuous conversion, the ADC module sequentially converts the channels configured in CHxMux~CH0Mux until the total number of conversions is completed. After the ADC module completes the total number of conversions, the ADC_IFR.SQRIF bit is automatically set to 1, and the accumulated value of the conversion results is saved in the ADC_ResultAcc register. Referring to Figure 5, a process of 10 continuous conversions and accumulations of AIN0, AIN1, and AIN5 is demonstrated. The conversion channels 9, 6, 3, 0 are configured as AIN0, the conversion channels 8, 5, 2 are configured as AIN1, and the conversion channels 7, 4, 1 are configured as AIN5. After the ADC_SqrStart.Start bit is set to 1, the ADC module sequentially converts the channels according to the configuration of the sequential scan conversion channels, until the count value of SQR_CNT becomes 0. The ADC_ResultAcc register is automatically accumulated each time the conversion is completed. The conversion results of AIN0, AIN1, and AIN5 given in the figure are 0x010, 0x020, and 0x040, respectively.

[0064] The ADC continuous conversion accumulation operation process is started by setting the ADC_SqrStart.Start bit.

[0065] Step 1: Configure the corresponding bits of PAADS~PEADS to configure the ADC channels to be converted as analog ports.

[0066] Step 2: Set PBADS.bit1 to 1 to configure the ADC external reference voltage pin as an analog port.

[0067] Note: If the ADC reference voltage is not selected as the external reference voltage pin, this step can be skipped.

[0068] Step 3: Set BGR_CR.BGR_EN to 1 to enable the BGR module.

[0069] Step 4: Set ADC_CR0.En to 1 to enable the ADC module.

[0070] Step 5: Delay for 20us to wait for the completion of the start of the ADC and BGR modules.

[0071] Step6: Set ADC_CR1.Mode to 1 to select scan mode.

[0072] Step7: Set ADC_CR1.RAccEn to 1 to enable ADC conversion auto accumulation function.

[0073] Step8: Configure ADC_CR0.Ref to select ADC reference voltage.

[0074] Step9: Set ADC_CR0.InRefEn to 1 to enable ADC internal reference voltage.

[0075] Note: If ADC reference voltage is not selected as internal reference voltage, this step can be skipped.

[0076] Step10: Configure ADC_CR0.SAM and ADC_CR0.CkDiv to set ADC conversion speed.

[0077] Step11: Configure ADC_SQRx.CHxMux to select sequence scan conversion channel.

[0078] Step12: Configure ADC_SQR2.CNT to select total conversion times of sequence scan conversion.

[0079] Note: Total conversion times should be consistent with the number of conversion channels configured in Step11.

[0080] Step13: Set ADC_ICR.SQRIC to 0 to clear ADC_IFR.SQRIF flag.

[0081] Step14: Set ADC_CR1.RAccClr to 0 to clear ADC_ResultAcc register.

[0082] Step15: Set ADC_SqrStart.Start to 1 to start ADC sequence scan conversion.

[0083] Step16: Wait for ADC_IFR.SQRIF to become 1, read ADC_ResultAcc register to obtain conversion result accumulation value.

[0084] Step17: If conversion of other channels is required, repeat Step11-Step16.

[0085] Step18: Set ADC_CR0.En and BGR_CR.BGR_EN to 0 to close ADC module and BGR module.

[0086] Further, as shown in FIG. 6, a schematic diagram of the ADC conversion result is shown. When the ADC conversion is completed, the ADC conversion result can be compared with the threshold value set by the user, supporting upper threshold comparison, lower threshold comparison, and interval value comparison. The function needs to set the corresponding control bits HtCmp, LtCmp, and RegCmp to 1. This function can realize automatic monitoring of the analog quantity, and an interrupt is generated only when the ADC conversion result meets the user's expectation, so that the user program is involved. The monitoring channel selection is configured through ADC_CR1.ThCh.

[0087] Upper threshold comparison: when the ADC conversion result is located in the interval [ADC_HT, 4095], ADC_IFR.HTIF is set to 1; writing 0 to ADC_ICR.HTIC clears ADC_IFR.HTIF.

[0088] Lower threshold comparison: when the ADC conversion result is located in the interval [0, ADC_LT), ADC_IFR.LTIF is set to 1; writing 0 to ADC_ICR.LTIC clears ADC_IFR.LTIF.

[0089] Interval value comparison: when the ADC conversion result is located in the interval [ADC_LT, ADC_HT), ADC_IFR.REGIF is set to 1; writing 0 to ADC_ICR.REGIC clears ADC_IFR.REGIF.

[0090] In summary, when the cable is operated for a long time in a high-temperature environment, thermal degradation will occur, and harmful gases will be released. In order to monitor the health status of the cable, it is necessary to detect the concentration change of these gases. The gas sensor detects the concentration change of the gas in the cable environment and converts it into an analog voltage signal. This is input to the analog-to-digital conversion module 302 through the AIN pin (e.g., AIN0) of the input module 100. The timing control module 200 selects an appropriate clock frequency, such as 1 MHz, through the PCLK pin to ensure that the sampling frequency of the analog-to-digital conversion module 302 is high enough to detect the gas concentration change in time. The reference module 501 provides a stable 2.5V reference voltage, which is input to the analog-to-digital conversion module 302 through the ExRef pin as the reference voltage of the comparator 301. The holding module 402 samples the output voltage of the gas sensor at a certain time and holds the voltage value to ensure signal stability during the entire analog-to-digital conversion process.

[0091] In addition, the analog-to-digital conversion module 302 uses the successive approximation method for analog-to-digital conversion: the comparator 301 first compares the voltage held by the holding module 402 with the reference voltage. The successive approximation register (SAR) controls the comparator 301 to compare the input voltage with the successive approximation digital value bit by bit, from the highest bit to the lowest bit, and finally generates a digital value corresponding to the input voltage. It takes 4-12 ADCCLK to complete a sampling during the conversion process, and 16 ADCCLK for the successive comparison process. The conversion result is output in the form of a digital signal through the output module 502. The SqrResult0-15 module outputs the results of the sequential scanning conversion, and the values of multiple sensors can be read sequentially. If it is necessary to accumulate the gas concentration change in a certain period of time, the ADC_ResultAcc module can be used to accumulate the conversion results. The external trigger module configures the external trigger signal through the ADC_ExtTrigger0, for example, triggering sampling once every minute. In this way, the harmful gas concentration can be monitored at regular intervals, and the harmful gas concentration change every minute can be recorded.

[0092] In actual application, the system can trigger ADC sampling once every minute, detect the harmful gas concentration in the cable environment through the gas sensor, and convert it into a digital signal. According to these data, the thermal degradation state of the cable can be analyzed, for example:

[0093] Normal state: the harmful gas concentration is below the preset threshold, indicating that the cable has no significant thermal degradation.

[0094] Abnormal state: the harmful gas concentration exceeds the preset threshold, which may indicate that the cable is undergoing thermal degradation and needs further detection and maintenance.

[0095] In addition, through the sequential scanning conversion function provided by the output module 502, the signals of multiple gas sensors can be detected simultaneously, and different types of degradation gases can be monitored, providing more comprehensive data support for cable state evaluation.

[0096] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit it. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A high precision analog-to-digital converter device for cable thermal degradation gas detection, characterized by: The application relates to a successive approximation analog-digital conversion chip. An input module (100) is used for receiving external analog signals; A timing control module (200) is used for providing system clock signals and controlling the analog-digital conversion process; A comparison and conversion module (300) is used for realizing a successive approximation algorithm and approximating the numerical value of the input signal through comparison and conversion; A sampling and holding module (400) is used for sampling and holding the input signal; A reference and output module (500) is used for providing a stable reference voltage and outputting the final digital conversion result. A register module is used for storing and configuring the parameters of the modules.

2. The high precision analog-to-digital converter device for cable thermal degradation gas detection of claim 1, wherein: The comparison and conversion module (300) comprises a comparator (301) and an analog-digital conversion module (302), the sampling and holding module (400) comprises a sampling module (401) and a holding module (402), and the reference and output module (500) comprises a reference module (501) and an output module (502).

3. The high precision analog to digital converter device for cable thermal degradation gas detection of claim 2, wherein: The output end of the input module (100) is connected with the positive end of the comparator (301), the negative end of the comparator (301) is connected with the output end to form negative feedback, the output end of the comparator (301) is connected with the input end of the sampling module (401), the output end of the sampling module (401) is connected with the input end of the holding module (402), the output end of the holding module (402) is connected with the input end of the analog-digital conversion module (302), the output ends of the timing control module (200) and the reference module (501) are respectively connected with the input end of the analog-digital conversion module (302), and the output end of the analog-digital conversion module (302) is connected with the input end of the output module (502).

4. The high precision analog-to-digital converter device for cable thermal degradation gas detection of claim 1 or 3, wherein: The input module (100) comprises pins AIN0-AIN16, a pin DAC, a pin AVCC / 3, a temperature sensor pin and a 1.2V reference voltage pin, and is used for receiving different external sampling signal voltages.

5. The high precision analog to digital converter device for cable thermal degradation gas detection of claim 4, wherein: The timing control module (200) comprises a PCLK pin, a PCLK / 2 pin, a PCLK / 4 pin and a PCLK / 8 pin, and different pin positions can be selected to provide clock signals with different frequencies for the chip.

6. The high precision analog-to-digital converter device for cable thermal degradation gas detection of claim 5, wherein: The reference module (501) comprises a 1.5V pin, a 2.5V pin, an ExRef pin and an AVCC pin, and is used for receiving external reference voltage signals.

7. The high precision analog to digital converter device for cable thermal degradation gas detection of claim 6, wherein: The output module (502) comprises SqrResult0-15 modules, JqrResult0-3 modules and an ADC_ResultAcc module, and is used for obtaining different analog-digital conversion output results.

8. The high precision analog to digital converter device for cable thermal degradation gas detection of claim 7, wherein: The analog-digital conversion module (302) carries out analog-digital conversion through the successive approximation method, wherein 4-12 clock signals are needed in the conversion process, and 16 clock signals are needed in the successive comparison process.

9. The high precision analog to digital converter device for cable thermal degradation gas detection of claim 8, wherein: The analog-digital conversion module (302) can be configured with an external trigger source through the register module, and the analog-digital conversion module (302) is started to carry out single conversion or sequential scanning conversion.

10. The high precision analog-to-digital converter device for cable thermal degradation gas detection of claim 9, wherein: The analog-digital conversion module (302) has upper threshold comparison, lower threshold comparison and interval value comparison functions, and triggers corresponding interrupts when the conversion result reaches the set threshold.

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