A multi-parameter integrated converter

Abstract

The utility model discloses a multi-parameter integrated converter, belonging to the technical field related to signal conversion, comprising a conversion module, an analog-to-digital conversion module, and an impedance matching filter circuit located between the conversion module and the analog-to-digital conversion module, wherein the impedance matching filter circuit comprises a signal input end connected to the conversion module, a resistor R1, a resistor R2 and a capacitor C1 connected to the signal input end, an operational amplifier U1, a resistor R3 and a signal output end connected to the operational amplifier U1, the resistor R3 is connected to the output pin of the operational amplifier U1, the resistor R1 and the resistor R2 are connected in parallel and then connected to the positive pin of the operational amplifier U1, and an impedance matching filter circuit is added between the conversion module and the analog-to-digital conversion module, thereby improving the load carrying capacity of the circuit and reducing mutual influence between circuits, avoiding voltage division attenuation and interference problems in the converted voltage signal, making the voltage signal collected by the analog-to-digital conversion circuit almost non-attenuated, and improving the signal-to-noise ratio of the analog voltage.

Description

Technical Field

[0001] The utility model relates to the technical field related to signal conversion, in particular to a multi-parameter integrated converter. Background Art

[0002] With the development of aerospace technology, the thrust requirements for rocket engines are increasing day by day. It is particularly important to ensure that they can run smoothly in a healthy and safe state. Especially in the new generation of liquid engines, there are many key measurement points involved in engine control, such as temperature, pressure, vibration, speed, liquid level, etc., and the accuracy requirements of the measured values ​​must also be guaranteed. The currently commonly used solution is a single measurement point and a single conditioning output. However, for the needs of multiple measurement points, the collection and processing of single object information is no longer suitable for the current situation, but requires the integrated capabilities of real-time collection and measurement of multi-parameter information and overall coordinated analysis and processing. Moreover, the single conditioning output method not only leads to a large number of conditioning boards (single machines) required, but also requires a large space requirement and requirement for the installation of conditioning boards (single machines) in the entire machine.

[0003] The multi-parameter integrated converter adopts an integrated and modular design concept to centrally collect and condition multiple channels of measured data, and finally accurately output the measured parameters to the monitoring system, thus achieving high-precision measurement parameter acquisition and sampling tracking. Figure 1 As shown, the multi-parameter integrated converter in the prior art includes a power module, a signal conversion module, an analog-to-digital conversion module, a central control module and a digital communication module. The power module mainly adopts technologies such as step-down, voltage stabilization and filtering to realize the conversion of the input voltage into the power supply voltage signal required by other modules, and supplies power to each module circuit; the signal conversion module converts the measured signal into a standard voltage signal, and performs preliminary amplification, filtering and impedance matching processing to facilitate the voltage signal collected by the analog-to-digital conversion module; the analog-to-digital conversion module performs analog-to-digital signal conversion to ensure the response time and accuracy of the collection; the central control module controls the analog-to-digital conversion module to collect the signal after preliminary conditioning, and processes the collected data, while saving the compensation information data and connecting to the serial communication interface; the digital communication module transmits the analyzed and processed data to the monitoring and evaluation system. The voltage signal collected by the multi-parameter integrated converter in the prior art often attenuates, and then the collected signal fluctuates, affecting the collection accuracy. Utility Model Content

[0004] The utility model provides a multi-parameter integrated converter, aiming to solve the above technical defects.

[0005] The specific technical solutions provided by the utility model are as follows:

[0006] A multi-parameter integrated converter provided by the utility model comprises a conversion module, an analog-to-digital conversion module, and an impedance matching filter circuit located between the conversion module and the analog-to-digital conversion module, wherein the impedance matching filter circuit comprises a signal input end connected to the conversion module, a resistor R1, a resistor R2 and a capacitor C1 connected to the signal input end, an operational amplifier U1, a resistor R3 and a signal output end connected to the operational amplifier U1, the resistor R3 is connected to the output pin of the operational amplifier U1, and the resistor R1 and the resistor R2 are connected in parallel to the positive pin of the operational amplifier U1.

[0007] Optionally, the resistor R1 and the resistor R2 are connected in parallel, and then connected in parallel with the capacitor C1 , and then connected to the positive pin of the operational amplifier U1 .

[0008] Optionally, the other end of the resistor R2 and the capacitor C1 are connected in parallel and then grounded.

[0009] Optionally, the input voltage of the operational amplifier U1 is VSS, and the comparison voltage of the operational amplifier U1 is VCC.

[0010] Optionally, one end of the resistor R3 is connected to the output pin of the operational amplifier U1, and the other end of the resistor R3 is connected to the negative pin of the operational amplifier U1 and then connected to the signal output end.

[0011] The utility model has the following beneficial technical effects:

[0012] The embodiment of the utility model provides a multi-parameter integrated converter including a conversion module, an analog-to-digital conversion module, and an impedance matching filter circuit located between the conversion module and the analog-to-digital conversion module, wherein the impedance matching filter circuit includes a signal input end connected to the conversion module, a resistor R1, a resistor R2 and a capacitor C1 connected to the signal input end, an operational amplifier U1, a resistor R3 and a signal output end connected to the operational amplifier U1, the resistor R3 is connected to the output pin of the operational amplifier U1, the resistor R1 and the resistor R2 are connected in parallel and connected to the positive pin of the operational amplifier U1, and an impedance matching filter circuit is added between the conversion module and the analog-to-digital conversion module, thereby improving the load capacity of the circuit and reducing the mutual influence between circuits, avoiding the voltage signal after conversion from voltage division attenuation and interference problems, making the voltage signal collected by the analog-to-digital conversion circuit almost without attenuation, and improving the signal-to-noise ratio of the analog voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. 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.

[0014] Figure 1 It is a schematic diagram of the framework structure of a multi-parameter integrated converter in the prior art;

[0015] Figure 2 The present invention is a schematic diagram of an impedance matching filter circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] The following will be combined Figure 1 and Figure 2 A multi-parameter integrated converter according to an embodiment of the utility model is described in detail.

[0018] refer to Figure 1 and Figure 2 As shown, the multi-parameter integrated converter provided by the embodiment of the utility model is different from the multi-parameter integrated converter in the prior art. Figure 1 On the basis of the structure shown, an impedance matching filter circuit is added between the conversion module and the analog-to-digital conversion module. The addition of the impedance matching filter circuit improves the load capacity of the circuit and reduces the mutual influence between circuits, avoids voltage division attenuation and interference problems in the converted voltage signal, and makes the voltage signal collected by the analog-to-digital conversion circuit almost without attenuation, thereby improving the signal-to-noise ratio of the analog voltage.

[0019] refer to Figure 2As shown, a multi-parameter integrated converter provided by an embodiment of the utility model includes a conversion module, an analog-to-digital conversion module, and an impedance matching filter circuit located between the conversion module and the analog-to-digital conversion module, wherein the impedance matching filter circuit includes a signal input terminal INO connected to the conversion module, a resistor R1 connected to the signal input terminal INO, a resistor R2 and a capacitor C1, an operational amplifier U1, a resistor R3 connected to the operational amplifier U1, and a signal output terminal AINO, wherein the resistor R3 is connected to the output pin of the operational amplifier U1, and the resistor R1 and the resistor R2 are connected in parallel to the positive pin of the operational amplifier U1. After the resistor R1 and the resistor R2 are connected in parallel, they are connected to the positive pin of the operational amplifier U1 in parallel with the capacitor C1. The other end of the resistor R2 and the capacitor C1 are connected in parallel and then grounded. The input voltage of the operational amplifier U1 is VSS, and the comparison voltage of the operational amplifier U1 is VCC. One end of the resistor R3 is connected to the output pin of the operational amplifier U1, and the other end of the resistor R3 is connected to the negative pin of the operational amplifier U1 and then connected to the signal output terminal AINO.

[0020] refer to Figure 1 and Figure 2 As shown, the signal conversion module of the embodiment of the utility model mainly amplifies and filters each measuring point of the engine, removes the electrical noise signal, and converts it into a standard voltage signal to ensure that the data collected by the analog-to-digital conversion module is effective and reliable; at the same time, an impedance matching circuit is added between the conversion module and the analog-to-digital conversion module to filter the analog voltage and collect a stable voltage signal. The power module adopts an isolated power module, which has a wide input voltage range, input undervoltage protection, and output with overcurrent and overvoltage protection functions. Among them, the overcurrent protection is self-recovering, and the working state is automatically restored without restarting, which improves the safety of the back-end circuit; and through the combination of EMI filter, common mode inductor, Π-type filtering, etc., the electromagnetic compatibility of the product is improved. The integrated analog-to-digital conversion module, the central control module and the digital communication module control the analog-to-digital conversion module through the SPI bus to obtain the standard voltage signal after preliminary processing, collect multiple parameters at the same time, and process the acquired signal as a whole, linear correction, precision compensation and temperature compensation, and finally use the digital communication module to transmit the measured value to the monitoring system in real time through the serial port, which is convenient for effective evaluation and management of the engine status.

[0021] The embodiment of the utility model provides a multi-parameter integrated converter including a conversion module, an analog-to-digital conversion module, and an impedance matching filter circuit located between the conversion module and the analog-to-digital conversion module, wherein the impedance matching filter circuit includes a signal input end connected to the conversion module, a resistor R1, a resistor R2 and a capacitor C1 connected to the signal input end, an operational amplifier U1, a resistor R3 and a signal output end connected to the operational amplifier U1, the resistor R3 is connected to the output pin of the operational amplifier U1, the resistor R1 and the resistor R2 are connected in parallel and connected to the positive pin of the operational amplifier U1, and an impedance matching filter circuit is added between the conversion module and the analog-to-digital conversion module, thereby improving the load capacity of the circuit and reducing the mutual influence between circuits, avoiding the voltage signal after conversion from voltage division attenuation and interference problems, making the voltage signal collected by the analog-to-digital conversion circuit almost without attenuation, and improving the signal-to-noise ratio of the analog voltage.

[0022] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A multi-parameter integrated converter, characterized in that: The multi-parameter integrated converter includes a conversion module, an analog-to-digital conversion module, and an impedance matching filter circuit located between the conversion module and the analog-to-digital conversion module, wherein the impedance matching filter circuit includes a signal input end connected to the conversion module, a resistor R1, a resistor R2 and a capacitor C1 connected to the signal input end, an operational amplifier U1, a resistor R3 connected to the operational amplifier U1, and a signal output end, the resistor R3 is connected to the output pin of the operational amplifier U1, and the resistor R1 and the resistor R2 are connected in parallel and connected to the positive pin of the operational amplifier U1.

2. The multi-parameter integrated converter according to claim 1, characterized in that: The resistor R1 and the resistor R2 are connected in parallel, and then connected in parallel with the capacitor C1 , and then connected to the positive pin of the operational amplifier U1 .

3. The multi-parameter integrated converter according to claim 2, characterized in that: The other end of the resistor R2 and the capacitor C1 are connected in parallel and then grounded.

4. The multi-parameter integrated converter according to claim 2, characterized in that: The input voltage of the operational amplifier U1 is VSS, and the comparison voltage of the operational amplifier U1 is VCC.

5. The multi-parameter integrated converter according to claim 2, characterized in that: One end of the resistor R3 is connected to the output pin of the operational amplifier U1 , and the other end of the resistor R3 is connected to the negative pin of the operational amplifier U1 and then connected to the signal output end.

Images