Self-adaptive analog quantity acquisition circuit

Abstract

The invention relates to an analog quantity acquisition circuit design technology, and discloses a self-adaptive analog quantity acquisition circuit, which comprises a positive and negative voltage judgment and conversion assembly, an amplifier assembly, an AD module, a DSP module and a logic control assembly, and is characterized in that the positive and negative voltage judgment and conversion assembly detects the positive and negative of an analog quantity signal output by an analog quantity acquisition interface; an analog quantity signal is output according to a detection result or the analog quantity signal is output after being subjected to positive and negative overturning; the logic control assembly controls the amplifier assembly to convert and output an amplified analog quantity signal to the AD module according to a set voltage range, and the AD module converts the amplified analog quantity signal into a digital signal and outputs the digital signal to the DSP module. According to the circuit designed by the invention, adaptive selection of the analog quantity acquisition range can be realized, a common customized analog acquisition technology and a prior configuration type analog quantity acquisition technology based on a configuration table are improved, and the flexibility and effective utilization rate of analog quantity acquisition are greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of electronic circuits, relates to analog quantity acquisition circuit design technology, and specifically relates to an adaptive analog quantity acquisition circuit. Background Art

[0002] The analog quantity acquisition interface is a common interface type in engineering practice. According to engineering experience, for an analog input, the acquisition accuracy is highest when its value falls between 1 / 3 and 2 / 3 of the full range. In traditional technology, the analog quantity acquisition range is only configured as a fixed acquisition range based on the input voltage range. Some sudden voltages that exceed the range cannot be acquired. At the same time, when the input voltage is at the boundary of the acquisition range for a long time, the acquisition accuracy is low and the hardware resource utilization is poor.

[0003] Therefore, how to adaptively change the analog quantity acquisition range according to the environment so that the input voltage is as close as possible to the highest area of ​​the acquisition range is particularly important for analog quantity acquisition technology. Summary of the invention

[0004] In order to solve the technical problems in the prior art that the analog quantity acquisition range is configured as a fixed range, so that the voltage out of the range cannot be acquired and the voltage acquisition accuracy of the voltage at the boundary of the acquisition range for a long time is low, and to achieve the purpose of adaptively changing the acquisition range according to the actual application situation to maximize the environmental adaptability of the analog quantity acquisition circuit and improve the acquisition accuracy, the present invention discloses an adaptive analog quantity acquisition circuit, the circuit includes a positive and negative voltage judgment and conversion component, an amplifier component, an AD module, a DSP module and a logic control component, the input end of the positive and negative voltage judgment and conversion component is connected to the analog quantity acquisition interface, the output end is connected to the input end of the amplifier component, the output end of the amplifier component is connected to the input end of the AD module, the output end of the AD module is connected to the DSP module, the input end of the logic control component is connected to the signal output end of the amplifier component, and the output end is connected to the input end of the DSP module and the enable end of the amplifier component.

[0005] Among them, the positive and negative voltage judgment and conversion component detects the positive and negative of the analog signal output by the analog acquisition interface, and outputs the analog signal according to the detection result or outputs it after flipping the positive and negative of the analog signal; the logic control component controls the amplifier component to convert and output the amplified analog signal to the AD module according to the set voltage range, and the AD module converts the amplified analog signal into a digital signal and outputs it to the DSP module.

[0006] In an optional embodiment of the above-mentioned positive and negative voltage judgment and conversion component, the positive and negative voltage judgment and conversion component includes a positive and negative gate and a positive and negative voltage detection unit, the positive and negative gate includes a positive path and a negative path, the negative path performs positive and negative flipping on the analog signal output by the analog acquisition interface, and the positive and negative pressure detection unit includes a positive path comparator and a negative path comparator.

[0007] The positive path, the negative path, the input ends of the positive path comparator and the negative path comparator are all connected to the analog quantity acquisition interface, the output ends of the positive path and the negative path are all connected to the amplifier component, the output end of the positive path comparator is respectively connected to the control end of the positive path and the input end of the DSP module, and the output end of the negative path comparator is respectively connected to the control end of the negative path and the input end of the DSP module.

[0008] The positive and negative pressure detection unit detects the positive and negative poles of the analog signal output by the analog acquisition interface, and outputs an on-off control signal to the positive path and the negative path according to the detection result.

[0009] Furthermore, both the positive path and the negative path include a controlled switch and a resistor, the negative path also includes an inverter, the negative input end of the positive path comparator is connected to a threshold value Vref+, the positive input end is connected to the analog quantity acquisition interface, and the output end is connected to the controlled switch of the positive path; the positive input end of the negative path comparator is connected to a threshold value Vref-, the input end is connected to the analog quantity acquisition interface, and the output end is connected to the controlled switch of the negative path.

[0010] Furthermore, the analog quantity acquisition interface outputs an analog quantity signal. When the analog quantity signal is greater than a threshold value Vref-, the analog quantity signal is judged to be a positive voltage, the controlled switch of the positive path is closed, and the controlled switch of the negative path is disconnected; when the analog quantity signal is less than a threshold value Vref+, the analog quantity signal is judged to be a negative voltage, the controlled switch of the negative path is closed, and the controlled switch of the positive path is disconnected; when the analog quantity signal is less than the threshold value Vref+ and greater than the threshold value Vref-, the analog quantity signal is judged to be zero voltage, and the controlled switches of the path and the positive path are both closed.

[0011] In an optional embodiment of the above-mentioned logic control component, the logic control component includes an output full-width indication unit and a logic control unit, the output end of the output full-width indication unit is connected to the input end of the logic control unit, and the input end is connected to the output end of the amplifier component.

[0012] The signal output terminal of the logic control unit is connected to the selection control terminal of the amplifier component, and the logic control unit controls the amplifier component to output the amplified analog signal according to the full-bias indication signal output by the output full-bias indication unit.

[0013] Furthermore, the output full-bias indication unit includes multiple comparators, each comparator receives an amplified analog signal output by an amplification channel in the amplifier component, compares the received amplified analog signal with the flip level, and outputs a full-bias indication signal. The logic control unit performs a logic operation on all the received full-bias indication signals according to a preset logic, and outputs the logic operation result to the DSP module. The DSP module outputs an on-off control signal to the amplifier component based on the logic operation result.

[0014] In an optional embodiment of the above-mentioned amplifier component, the amplifier component includes an amplifier array and an amplifier selector, the output end of the amplifier array is connected to the output end of the positive and negative voltage judgment and conversion component, the signal input end of the amplifier selector is connected to the output end of the amplifier array, the signal output end is connected to the AD module, and the selection control end is connected to the logic control component.

[0015] In an improved embodiment of the above-mentioned adaptive analog quantity acquisition circuit, the circuit also includes an acquisition multiplexer, the signal input end of the acquisition multiplexer is connected to the analog quantity acquisition interface, the output end is connected to the positive and negative voltage judgment and conversion component, and the enable end is connected to the DSP module.

[0016] In an improved embodiment of the above-mentioned adaptive analog quantity acquisition circuit, the circuit also includes an input preprocessing unit, the input end of the input preprocessing unit is connected to the analog quantity acquisition interface, and the output end is connected to the input end of the positive and negative voltage judgment and conversion component, and the input preprocessing unit filters and performs overvoltage clamping processing on the analog quantity signal output by the analog quantity acquisition interface.

[0017] Furthermore, the input preprocessing unit includes multiple preprocessing circuits, each of which is connected to one of the analog quantity acquisition interfaces respectively, and the preprocessing circuit includes a first-order RC filter circuit and an overvoltage clamping diode. The input end of the first-order RC filter circuit is connected to the analog quantity acquisition interface, and the output end is connected to the overvoltage clamping diode and the positive and negative voltage selection component.

[0018] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least the following: the adaptive analog quantity acquisition circuit of the present invention can realize the adaptive selection of the analog quantity acquisition range according to the amplification channel selection end of the amplifier component according to the logic control component, thereby improving the common customized analog quantity acquisition technology and the analog quantity acquisition technology based on the prior configuration of the configuration table, and greatly improving the flexibility and effective utilization rate of analog quantity acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The present invention is a schematic diagram of an adaptive analog quantity acquisition circuit disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0022] The following describes the implementation methods of the present application through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and the features of the embodiments can be combined with each other in the absence of conflict. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0023] This embodiment discloses an adaptive analog quantity acquisition circuit. Figure 1 As shown, the circuit includes a positive and negative voltage judgment and conversion component, an amplifier component, an AD module, a DSP module and a logic control component. The input end of the positive and negative voltage judgment and conversion component is connected to the analog quantity acquisition interface, and the output end is connected to the input end of the amplifier component. The output end of the amplifier component is connected to the input end of the AD module, and the output end of the AD module is connected to the DSP module. The input end of the logic control component is connected to the signal output end of the amplifier component, and the output end is connected to the input end of the DSP module and the enable end of the amplifier component.

[0024] Among them, the positive and negative voltage judgment and conversion component detects the positive and negative of the analog signal output by the analog acquisition interface, and outputs the analog signal according to the detection result or outputs it after flipping the positive and negative of the analog signal; the logic control component controls the amplifier component to convert and output the amplified analog signal to the AD module according to the set voltage range, and the AD module converts the amplified analog signal into a digital signal and outputs it to the DSP module.

[0025] Specifically, the above AD module converts the received analog signal into a digital signal and outputs it to the DSP module. The output mode of the AD acquisition module can be configured as parallel output or serial output by controlling the input signal. The control input signal includes a conversion start signal, an SPI serial communication bus signal, a conversion end indication signal, and an input chip select enable signal. The AD is powered by a ±10V voltage.

[0026] The DSP module is used to receive the collected data from the AD module, and at the same time receive the fault output indication signal of the logic control component, control the input multiplexing selection logic and input enable. The DSP module should meet the following control logic: when the fault indication signal is not triggered, the analog input enable is turned on; when the fault indication signal is triggered, the analog input enable is turned off.

[0027] In an optional embodiment of the above-mentioned positive and negative voltage judgment and conversion component, the positive and negative voltage judgment and conversion component is used to judge the positive and negative nature of the analog signal output by the analog acquisition interface according to the set positive and negative judgment threshold. When the path comparator judges that it is a positive voltage, the analog signal can be directly output. When it is judged to be a negative voltage, the analog signal needs to be flipped to convert the negative voltage into a positive voltage and then output. At the same time, the detection result is output to the DSP module. When the DSP module receives the digital signal output by the AD module, the positive and negative signs are added to the received signal.

[0028] Specifically, see Figure 1 As shown, the positive and negative voltage judgment and conversion component includes a positive and negative selector and a positive and negative voltage detection unit, the positive and negative selector includes a positive path and a negative path, the negative path performs positive and negative flipping on the analog signal output by the analog acquisition interface, and the positive and negative voltage detection unit includes a positive path comparator and a negative path comparator.

[0029] The positive path, the negative path, the input ends of the positive path comparator and the negative path comparator are all connected to the analog quantity acquisition interface, the output ends of the positive path and the negative path are all connected to the amplifier component, the output end of the positive path comparator is respectively connected to the control end of the positive path and the input end of the DSP module, and the output end of the negative path comparator is respectively connected to the control end of the negative path and the input end of the DSP module.

[0030] The positive and negative pressure detection unit detects the positive and negative poles of the analog signal output by the analog acquisition interface, and outputs an on-off control signal to the positive path and the negative path according to the detection result.

[0031] Further, see Figure 1 As shown, the positive path and the negative path both include controlled switches and resistors, and the negative path also includes an inverter. The negative input end of the positive path comparator is connected to the threshold value Vref+, the positive input end is connected to the analog quantity acquisition interface, and the output end is connected to the controlled switch of the positive path; the positive input end of the negative path comparator is connected to the threshold value Vref-, the input end is connected to the analog quantity acquisition interface, and the output end is connected to the controlled switch of the negative path. The resistance values ​​of the resistors R1 and R2 of the positive path and the negative path are the same.

[0032] Furthermore, the analog quantity acquisition interface outputs an analog quantity signal. When the analog quantity signal is greater than the threshold value Vref-, the analog quantity signal is judged to be a positive voltage, the controlled switch of the positive path is closed, and the controlled switch of the negative path is disconnected; when the analog quantity signal is less than the threshold value Vref+, the analog quantity signal is judged to be a negative voltage, the controlled switch of the negative path is closed, and the controlled switch of the positive path is disconnected; when the analog quantity signal is less than the threshold value Vref+ and greater than the threshold value Vref-, the analog quantity signal is judged to be zero voltage, and the controlled switches of the path and the positive path are both closed. Specifically, the positive and negative threshold values ​​Vref- and Vref+ should satisfy the following size relationship: Vref+<0<Vref-, and the positive and negative pressure detection unit and the positive and negative pressure gate control logic should satisfy the following Table 1:

[0033] Table 1 Positive and negative voltage gating control logic

[0034]

[0035]

[0036] In an optional embodiment of the above logic control component, see Figure 1 As shown, the logic control component includes an output full-bias indication unit and a logic control unit, the output end of the output full-bias indication unit is connected to the input end of the logic control unit, and the input end is connected to the output end of the amplifier component.

[0037] The signal output terminal of the logic control unit is connected to the selection control terminal of the amplifier component, and the logic control unit controls the amplifier component to output the amplified analog signal according to the full-bias indication signal output by the output full-bias indication unit.

[0038] Further, see Figure 1 As shown, the output full-bias indication unit includes a plurality of comparators, each of which receives the amplified analog signal output by an amplification channel in the amplifier component, compares the received amplified analog signal with the flip level and outputs a full-bias indication signal, and the logic control unit performs a logic operation on all the received full-bias indication signals according to the preset logic, and outputs the logic operation result to the DSP module, and the DSP module outputs an on-off control signal to the amplifier component according to the logic operation result. Specifically, the on-off control signal: fault indication signal Vover1~Vovern, should meet the following control rules in Table 2 below:

[0039] Table 2: Amplifier component on / off control logic

[0040] Input voltage Vop_out value Logic output result Voverx Vop_out ≥ Vrefx 0 Vop_out<Vrefx 1

[0041] Among them, Vop_out is the analog output signal of the amplifier selector, vrefx is the reverse input terminal signal (flip level) of the xth comparator in the fault indication unit, and Voverx is the output terminal signal of the xth comparator in the fault indication unit. When the logic output result is 1, it means that after the amplifier component amplifies the analog quantity by different multiples, all values ​​exceed the acquisition range of the AD module. At this time, the output on-off control signal is a disconnection signal, prohibiting the amplifier component from outputting analog signals; when the logic output result is 0, it means that after the amplifier component amplifies the analog quantity by different multiples, some values ​​do not exceed the acquisition range of the AD module. At this time, the output on-off control signal is a connection signal, and the amplifier component can output analog signals.

[0042] More specifically, the flip level of the comparator in the output full-bias indication unit and each amplification channel (i.e., amplification range) of the amplifier array in the amplifier component satisfy the following relationship:

[0043] Verf k=2 / 3max k, k(1,2,3,4,5,6,...,n).

[0044] The logic output result and input signal of the output full-bias indication unit should satisfy the following logic truth values ​​as shown in Table 3:

[0045] Table 3: Operational logic of the output full-bias indication unit

[0046] Comparator number Logic Input Logic output CS Logic output Er 1 000000……00 0 0 2 100000……00 1 0 3 110000……00 2 0 4 111000……00 3 0 5 111100……00 4 0 6 111110……00 5 0 7 111111……00 6 0 … … … … n-1 111111……10 n-2 0 n 111111……11 n-1 1

[0047] In an alternative embodiment of the above amplifier assembly, see Figure 1 As shown, the amplifier component includes an amplifier array and an amplifier selector, the output end of the amplifier array is connected to the output end of the positive and negative voltage judgment and conversion component, the signal input end of the amplifier selector is connected to the output end of the amplifier array, the signal output end is connected to the AD module, and the selection control end is connected to the logic control component.

[0048] In specific implementation, the amplifier array is composed of several operational amplifiers. The number of operational amplifiers should be set with a reasonable amplification factor according to the actual analog voltage range for gating in different environments. The amplification factor must include 0.8x amplification and 1x amplification circuits, and the nonlinear calibration function of the circuit should be used. All optional ranges of the amplifier array should meet the following relationship:

[0049] Among them, max k is the maximum range corresponding to the kth amplifier.

[0050] The amplifier selector can output the voltage processed by the corresponding amplifier circuit to the AD module through the selection control signal output by the logic control component. The selection control signal includes a channel selection signal and an enable signal. Among them, the channel selection signal is output by the logic control unit of the logic control component, and the enable signal comes from the logical operation result of all output end results of the output full-bias indication unit of the logic control component and the fault indication signal of the logic operation unit. The logical operation should satisfy the following relationship:

[0051]

[0052] Among them, MUXop_EN is the enable signal of the amplifier selector, Vout_Er is the fault indication signal of the logic control unit, and Vover1~Vovern are the output signals of n comparators in the output full-bias unit. A pull-to-ground resistor is set at the output end of the amplifier selector to ensure the state stability during power-on initialization.

[0053] In the improved embodiment of the above adaptive analog quantity acquisition circuit, when there are multiple analog quantity acquisition interfaces, see Figure 1As shown, the circuit also includes a collection multiplexer, the signal input end of the collection multiplexer is connected to the analog quantity collection interface, the output end is connected to the positive and negative voltage judgment and conversion component, and the enable end is connected to the DSP module. When the collection multiplexer is selected, there are at least 3 redundant analog quantity input ends on the collection multiplexer, which are used to connect the ±10Vref reference source pair and the GND signal, and the nonlinear data calibration function of the analog quantity collection, and the output end is provided with a pull-to-ground resistor to ensure the state stability during power-on initialization.

[0054] In the improved embodiment of the above adaptive analog quantity acquisition circuit, see Figure 1 As shown, the circuit also includes an input preprocessing unit, the input end of the input preprocessing unit is connected to the analog quantity acquisition interface, and the output end is connected to the input end of the positive and negative voltage judgment and conversion component. The input preprocessing unit filters and performs overvoltage clamping processing on the analog quantity signal output by the analog quantity acquisition interface.

[0055] Further, see Figure 1 As shown, the input preprocessing unit includes a plurality of preprocessing circuits, each of which is connected to one of the analog quantity acquisition interfaces, and the preprocessing circuit includes a first-order RC filter circuit and an overvoltage clamping diode. The input end of the first-order RC filter circuit is connected to the analog quantity acquisition interface, and the output end is connected to the overvoltage clamping diode and the positive and negative voltage gating component. The clamping voltage of the overvoltage clamping diode is set to ±15V, and the design of the RC filter should comply with the following principle: f = 1 / (2πRC), where f is the cutoff frequency.

[0056] In the present invention, the process of collecting analog signals by the above-mentioned adaptive analog acquisition circuit is as follows:

[0057] Step 1: Enable all to be closed, initialize the positive and negative gates to be fully opened, and the gate signals of the amplification multiplexer and the acquisition multiplexer are both in the first channel;

[0058] Step 2: Enable all functions;

[0059] Step 3: The analog input signal enters the acquisition multiplexer through the input preprocessing unit;

[0060] Step 4: The multiplexer selects one input signal to output after being selected by the DSP;

[0061] Step 5: The positive and negative detection unit receives the output signal of the acquisition multiplexer, controls the positive and negative selection terminals according to the judgment logic result, and sends the selection control signal to the DSP;

[0062] Step 6: The analog input signal is output after being rectified by the amplifier and selected by the amplification selection circuit;

[0063] Step 7: The output full-bias indication signal and logic control unit outputs an amplified multi-way gating control signal according to the control logic, switches the amplified multi-way gating circuit according to the input voltage, and sends the gating chip select control terminal to the DSP;

[0064] Step 8: The AD acquisition module receives the analog input signal and sends the conversion result to the DSP module;

[0065] Step 9: The DSP settles the digital input quantity according to the digital input quantity of the AD simulation, the positive and negative selection control signals and the multi-channel selection control signals to obtain the final analog acquisition result.

[0066] The adaptive analog quantity acquisition circuit of the present invention can realize adaptive selection of analog quantity acquisition range according to the amplification channel selection end of the amplifier component by the logic control component, thereby improving the common customized analog quantity acquisition technology and the analog quantity acquisition technology of a priori configuration based on the configuration table, and greatly improving the flexibility and effective utilization rate of analog quantity acquisition.

[0067] Obviously, those skilled in the art should understand that the modules or steps of the above-mentioned embodiments of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. In this way, the embodiments of the present invention are not limited to any specific combination of hardware and software.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adaptive analog quantity acquisition circuit, characterized in that: The circuit includes a positive and negative voltage judgment and conversion component, an amplifier component, an AD module, a DSP module and a logic control component. The input end of the positive and negative voltage judgment and conversion component is connected to the analog quantity acquisition interface, and the output end is connected to the input end of the amplifier component. The output end of the amplifier component is connected to the input end of the AD module, and the output end of the AD module is connected to the DSP module. The input end of the logic control component is connected to the signal output end of the amplifier component, and the output end is connected to the input end of the DSP module and the enable end of the amplifier component. The positive and negative voltage judgment and conversion component detects the positive and negative of the analog signal output by the analog acquisition interface, and outputs the analog signal according to the detection result or outputs the analog signal after flipping the positive and negative sides; The logic control component controls the amplifier component to convert and output the amplified analog signal to the AD module according to the set voltage range, and the AD module converts the amplified analog signal into a digital signal and outputs it to the DSP module.

2. The adaptive analog quantity acquisition circuit according to claim 1, characterized in that: The positive and negative voltage judgment and conversion component includes a positive and negative gate and a positive and negative voltage detection unit, the positive and negative gate includes a positive path and a negative path, the negative path performs positive and negative flipping on the analog signal output by the analog acquisition interface, and the positive and negative voltage detection unit includes a positive path comparator and a negative path comparator; The positive path, the negative path, the positive path comparator and the input end of the negative path comparator are all connected to the analog quantity acquisition interface, the output ends of the positive path and the negative path are all connected to the amplifier component, the output end of the positive path comparator is respectively connected to the control end of the positive path and the input end of the DSP module, and the output end of the negative path comparator is respectively connected to the control end of the negative path and the input end of the DSP module; The positive and negative pressure detection unit detects the positive and negative poles of the analog signal output by the analog acquisition interface, and outputs an on-off control signal to the positive path and the negative path according to the detection result.

3. The adaptive analog quantity acquisition circuit according to claim 2, characterized in that: The positive path and the negative path both include a controlled switch and a resistor, the negative path also includes an inverter, the negative input end of the positive path comparator is connected to the threshold Vref+, the positive input end is connected to the analog quantity acquisition interface, and the output end is connected to the controlled switch of the positive path; The positive input terminal of the negative path comparator is connected to the threshold Vref-, the input terminal is connected to the analog quantity acquisition interface, and the output terminal is connected to the controlled switch of the negative path.

4. The adaptive analog quantity acquisition circuit according to claim 3, characterized in that: The analog quantity acquisition interface outputs an analog quantity signal. When the analog quantity signal is greater than a threshold value Vref-, the analog quantity signal is judged to be a positive voltage, the controlled switch of the positive path is closed, and the controlled switch of the negative path is disconnected; when the analog quantity signal is less than a threshold value Vref+, the analog quantity signal is judged to be a negative voltage, the controlled switch of the negative path is closed, and the controlled switch of the positive path is disconnected; when the analog quantity signal is less than a threshold value Vref+ and greater than a threshold value Vref-, the analog quantity signal is judged to be zero voltage, and the controlled switches of the path and the positive path are both closed.

5. The adaptive analog quantity acquisition circuit according to claim 1, characterized in that: The logic control component comprises an output full-bias indication unit and a logic control unit, wherein the output end of the output full-bias indication unit is connected to the input end of the logic control unit, and the input end is connected to the output end of the amplifier component; The signal output terminal of the logic control unit is connected to the selection control terminal of the amplifier component, and the logic control unit controls the amplifier component to output the amplified analog signal according to the full-bias indication signal output by the output full-bias indication unit.

6. The adaptive analog quantity acquisition circuit according to claim 5, characterized in that: The output full-bias indication unit includes multiple comparators, each comparator receives an amplified analog signal output by an amplification channel in the amplifier component, compares the received amplified analog signal with the flip level, and outputs a full-bias indication signal. The logic control unit performs a logic operation on all the received full-bias indication signals according to a preset logic, and outputs the logic operation result to the DSP module. The DSP module outputs an on-off control signal to the amplifier component based on the logic operation result.

7. The adaptive analog quantity acquisition circuit according to claim 1, characterized in that: The amplifier component includes an amplifier array and an amplifier selector, the output end of the amplifier array is connected to the output end of the positive and negative voltage judgment and conversion component, the signal input end of the amplifier selector is connected to the output end of the amplifier array, the signal output end is connected to the AD module, and the selection control end is connected to the logic control component.

8. The adaptive analog quantity acquisition circuit according to any one of claims 1 to 7, characterized in that: The circuit also includes a collection multiplexer, a signal input end of the collection multiplexer is connected to the analog quantity collection interface, an output end is connected to the positive and negative voltage judgment and conversion component, and an enable end is connected to the DSP module.

9. The adaptive analog quantity acquisition circuit according to any one of claims 1 to 7, characterized in that: The circuit also includes an input preprocessing unit, the input end of the input preprocessing unit is connected to the analog quantity acquisition interface, and the output end is connected to the input end of the positive and negative voltage judgment and conversion component. The input preprocessing unit filters and performs overvoltage clamping processing on the analog quantity signal output by the analog quantity acquisition interface.

10. The adaptive analog quantity acquisition circuit according to claim 9, characterized in that: The input preprocessing unit includes multiple preprocessing circuits, each of which is connected to one of the analog quantity acquisition interfaces respectively. The preprocessing circuit includes a first-order RC filter circuit and an overvoltage clamping diode. The input end of the first-order RC filter circuit is connected to the analog quantity acquisition interface, and the output end is connected to the overvoltage clamping diode and the positive and negative voltage selection components.

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