High-resolution current-frequency conversion device and method

Abstract

The present invention provides a high-resolution current-frequency conversion device, which comprises a preprocessing module, a comparison module and an analysis module; the preprocessing module is used to integrate the received current signal to generate an integral voltage; the comparison module is connected to the preprocessing module, and is used to collect the integral voltage, compare the integral voltage with a plurality of preset threshold voltages, and generate a pulse signal according to the comparison result; the analysis module is connected to the comparison module, and is used to output a corresponding number of the pulse signals according to the difference between the current sampling result of the comparison module and the previous sampling result.

Description

Technical Field

[0001] The present invention relates to the field of inertial navigation, and in particular to a high-resolution current-frequency conversion device and method for current / frequency conversion. Background Art

[0002] Current / frequency conversion circuits have been increasingly widely used in the field of inertial navigation. Their main function is to convert current signals into corresponding frequency signals to achieve pulse output. The scale factor of the current / frequency conversion circuit is denoted by K, which is defined as the number of pulse signals output by the current / frequency conversion circuit within 1 second when the input current is 1 mA.

[0003] With the further development of aerospace technology and the further improvement of accelerometer accuracy, higher requirements are put forward for the performance indicators of current / frequency conversion circuits, requiring both a large range and high resolution. However, the traditional conversion circuit itself has a contradictory relationship between resolution and measurement range, and cannot meet the demand for high resolution while maintaining a large measurement range. When the operating frequency of the circuit is increased in order to increase the scale factor and obtain high resolution, the switching characteristics of the discrete device will deteriorate, resulting in poor linearity. Summary of the invention

[0004] The present invention aims to provide a current frequency conversion circuit and method capable of achieving high resolution, thereby improving the resolution of the conversion circuit while ensuring the measurement range.

[0005] To achieve the above-mentioned purpose, the high-resolution current-frequency conversion device provided by the present invention specifically includes: a preprocessing module, a comparison module and an analysis module; the preprocessing module is used to integrate the received current signal to generate an integral voltage; the comparison module is connected to the preprocessing module, and is used to collect the integral voltage, compare the integral voltage with a plurality of preset threshold voltages, and generate a pulse signal according to the comparison result; the analysis module is connected to the comparison module, and is used to output a corresponding number of the pulse signals according to the difference between the current sampling result of the comparison module and the previous sampling result.

[0006] In the above-mentioned high-resolution current-frequency conversion device, preferably, the device also includes a feedback module, the input end of the feedback module is connected to the analysis module, and the output end of the feedback module is connected to the preprocessing module, for performing circuit feedback processing according to the control signal output by the analysis module.

[0007] In the above-mentioned high-resolution current-frequency conversion device, preferably, the feedback module includes a switching circuit and a constant current source circuit, the input end of the switching circuit is connected to the analysis module, the output end of the switching circuit is connected to the input end of the constant current source circuit, and the output end of the constant current source circuit is connected to the input end of the preprocessing module.

[0008] In the above-mentioned high-resolution current-frequency conversion device, preferably, the comparison module also includes the analysis module generating a control signal to control the switching circuit and the constant current source circuit to perform circuit feedback processing when the integrated voltage is higher than the maximum threshold voltage. In the feedback processing stage, the number of pulse signal outputs is the difference between the number of threshold voltages and the previous sampling result.

[0009] In the above-mentioned high-resolution current-frequency conversion device, preferably, the analysis module includes a logic data processing unit, and the logic data processing unit is used to output a corresponding number of the pulse signals according to the difference between the current sampling result of the comparison module and the previous sampling result; and / or, in the feedback stage, output a corresponding number of the pulse signals according to the difference between the number of threshold voltages and the previous sampling result.

[0010] In the above-mentioned high-resolution current-frequency conversion device, preferably, the analysis module also includes a signal control unit, and the signal control unit is used to generate a control signal according to the zero-value pulse signal to control the switching circuit and the constant current source circuit to execute the circuit feedback stage.

[0011] In the above-mentioned high-resolution current-frequency conversion device, preferably, it is characterized in that the comparison module is an AD sampling circuit.

[0012] In the above-mentioned high-resolution current-frequency conversion device, preferably, the analysis module is a FPGA module.

[0013] The present invention also provides a high-resolution current-frequency conversion method, which includes: integrating the received current signal to generate an integrated voltage; comparing the integrated voltage with a plurality of preset threshold voltages, and generating a pulse signal according to the comparison result; and outputting a corresponding number of the pulse signals according to the difference between the current sampling result and the previous sampling result.

[0014] In the above-mentioned high-resolution current-frequency conversion method, preferably, the method further includes: when the integrated voltage is higher than the maximum threshold voltage, the analysis module generates a control signal to control the switching circuit and the constant current source circuit to perform circuit feedback processing, and in the feedback processing stage, the number of pulse signal outputs is the difference between the number of threshold voltages and the previous sampling result.

[0015] The beneficial technical effect of the present invention is that: the present invention replaces the original threshold circuit for threshold judgment by using a comparison module to perform threshold judgment, thereby achieving the purpose of realizing multiple pulse outputs within a complete integration-feedback cycle without increasing the operating frequency of the circuit, thereby achieving the purpose of improving the resolution of the current / frequency conversion circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and are used to illustrate the embodiments of the present invention and, together with the text description, to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work; therefore, these drawings do not constitute a limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of a high-resolution current-to-frequency conversion device provided by an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of the application structure of a high-resolution current-frequency conversion device provided by an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the structure of an analysis module provided by an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of a pulse output waveform of a high-resolution current-frequency conversion device provided by an embodiment of the present invention during a circuit operation process;

[0021] Figure 5 A schematic flow chart of a high-resolution current-frequency conversion method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that as long as there is no conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other, and the technical solutions formed are all within the protection scope of the present invention.

[0023] In addition, the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be performed in an order different from that shown here.

[0024] Please refer to Figure 1As shown, the high-resolution current-frequency conversion device provided by the present invention specifically includes: a preprocessing module, a comparison module and an analysis module; the preprocessing module is used to integrate the received current signal to generate an integral voltage; the comparison module is connected to the preprocessing module, used to collect the integral voltage, compare the integral voltage with a plurality of preset threshold voltages, and generate a pulse signal according to the comparison result; the analysis module is connected to the comparison module, used to output a corresponding number of pulse signals according to the difference between the current sampling result of the comparison module and the previous sampling result. In this embodiment, the preprocessing module can be an existing integration circuit or other module, and its function is to preprocess the input current signal to generate an integral voltage; the comparison module can be an AD sampling circuit; and the analysis module can be an FPGA module. In this way, by using the AD sampling circuit to perform threshold judgment to replace the original threshold circuit for threshold judgment, the purpose of realizing multiple pulse outputs within a complete integration-feedback cycle is achieved without increasing the operating frequency of the circuit, thereby achieving the purpose of improving the resolution of the current / frequency conversion circuit.

[0025] In the above embodiment, the device further includes a feedback module, the input end of the feedback module is connected to the analysis module, and the output end of the feedback module is connected to the pre-processing module, which is used to perform circuit feedback processing according to the control signal output by the analysis module; for details, please refer to Figure 2 As shown, the feedback module may include a switch circuit and a constant current source circuit, the input end of the switch circuit is connected to the analysis module, the output end of the switch circuit is connected to the input end of the constant current source circuit, and the output end of the constant current source circuit is connected to the input end of the preprocessing module. In actual work, the principle of using a switch circuit and a constant current source circuit to realize feedback is relatively common, so the present invention will not be described in detail its specific operating principle and logic.

[0026] In actual work, the integrated voltage may be higher than the maximum value of the threshold voltage or lower than the minimum value of the threshold voltage. For this reason, in one embodiment of the present invention, the comparison module further includes when the integrated voltage is higher than the maximum threshold voltage, the analysis module generates a control signal to control the switch circuit and the constant current source circuit to perform circuit feedback processing. In the feedback processing stage, the number of pulse signal outputs is the difference between the number of threshold voltages and the previous sampling result.

[0027] Please refer to Figure 3As shown, in one embodiment of the present invention, the analysis module may include a logic data processing unit and a signal control unit, the logic data processing unit is used to output a corresponding number of the pulse signals according to the difference between the current sampling result of the comparison module and the previous sampling result; and / or, in the feedback stage, output a corresponding number of the pulse signals according to the difference between the number of threshold voltages and the previous sampling result; the signal control unit is used to generate a control signal according to the zero-value pulse signal to control the switch circuit and the constant current source circuit to execute the circuit feedback stage.

[0028] Please refer to Figures 2 to 4 As shown, during the actual operation of the high-resolution current-frequency conversion device provided by the present invention, when current is input to the integration circuit, the integration circuit integrates to generate an integration voltage, and the AD sampling circuit collects the output voltage Uth of the integration circuit in a periodic manner, and compares the voltage value with the preset threshold voltages Vth1, Vth2, Vth3, and Vth4 (here, four threshold voltages are taken as an example). When the integration voltage is lower than the currently compared threshold voltage, the output is 0, and when it is higher than the currently compared threshold voltage, the output is AD (n). At this time, the number of output pulses is the difference between the current sampling result and the previous sampling result. When the integration voltage is higher than the threshold voltage Vth4, the circuit enters the feedback stage, and the value of AD (n) is kept at 0 until the feedback stage ends. The number of output pulses is the output difference between the preset threshold voltage threshold number 4 and the previous AD sampling result. The above process is repeated in the next cycle. Figure 4 It can be seen that since multiple threshold voltage thresholds are set to judge the AD sampling voltage, the traditional current-frequency conversion circuit will output a pulse only after reaching the threshold voltage Vth4 and entering the feedback stage. Now, each AD sampling voltage will generate a pulse output after comparison, thereby achieving an improvement in the current resolution.

[0029] Please refer to Figure 5 As shown, the present invention also provides a high-resolution current frequency conversion method, the method comprising: S501 integrating the received current signal to generate an integral voltage; S502 comparing the integral voltage with a plurality of preset threshold voltages, and generating a pulse signal according to the comparison result; S503 outputting a corresponding number of the pulse signals according to the difference between the current sampling result and the previous sampling result. The specific application method in this example has been described in the above-mentioned embodiment, and will not be described in detail here.

[0030] In the above embodiment, comparing the integrated voltage with a plurality of preset threshold voltages respectively includes: when the integrated voltage is higher than the maximum threshold voltage, the analysis module generates a control signal to control the switch circuit and the constant current source circuit to perform circuit feedback processing, and in the feedback processing stage, the number of pulse signal outputs is the difference between the number of threshold voltages and the previous sampling result.

[0031] The beneficial technical effect of the present invention is that: the present invention replaces the original threshold circuit for threshold judgment by using a comparison module to perform threshold judgment, thereby achieving the purpose of realizing multiple pulse outputs within a complete integration-feedback cycle without increasing the operating frequency of the circuit, thereby achieving the purpose of improving the resolution of the current / frequency conversion circuit.

[0032] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0033] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0034] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0035] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0036] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-resolution current-frequency conversion device, characterized in that: The device comprises a pre-processing module, a comparison module and an analysis module; The pre-processing module is used to perform integration processing on the received current signal to generate an integrated voltage; The comparison module is connected to the pre-processing module, and is used to collect the integrated voltage, compare the integrated voltage with a plurality of preset threshold voltages, and generate a pulse signal according to the comparison result; The analysis module is connected to the comparison module, and is used to output a corresponding number of pulse signals according to the difference between the current sampling result of the comparison module and the previous sampling result; The device further comprises a feedback module, the input end of the feedback module is connected to the analysis module, the output end of the feedback module is connected to the pre-processing module, and is used to perform circuit feedback processing according to the control signal output by the analysis module; The feedback module comprises a switch circuit and a constant current source circuit, the input end of the switch circuit is connected to the analysis module, the output end of the switch circuit is connected to the input end of the constant current source circuit, and the output end of the constant current source circuit is connected to the input end of the preprocessing module; The comparison module also includes the analysis module generating a control signal to control the switch circuit and the constant current source circuit to perform circuit feedback processing when the integrated voltage is higher than the maximum threshold voltage. In the feedback processing stage, the number of pulse signal outputs is the difference between the number of threshold voltages and the previous sampling result.

2. The high-resolution current-to-frequency conversion device according to claim 1, characterized in that: The comparison module is an AD sampling circuit.

3. The high-resolution current-to-frequency conversion device according to claim 1, characterized in that: The analysis module is an FPGA module.

4. A high-resolution current-frequency conversion method, characterized in that: The method comprises: Integrating the received current signal to generate an integrated voltage; Comparing the integrated voltage with a plurality of preset threshold voltages respectively, and generating a pulse signal according to the comparison results; Outputting a corresponding number of the pulse signals according to the difference between the current sampling result and the previous sampling result; The method further comprises: When the integrated voltage is higher than the maximum threshold voltage, the analysis module generates a control signal to control the switch circuit and the constant current source circuit to perform circuit feedback processing. In the feedback processing stage, the number of pulse signal outputs is the difference between the number of threshold voltages and the previous sampling result.

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