Adapter for converting various sensor signals into universal signals

Abstract

An adapter for converting various sensor signals into general signals is characterized in that a power conversion module converts voltage provided by acquisition equipment into input voltage of a sensor and then is connected to a point A of the sensor through a first output line; the general conversion module is connected with a second output line, a first acquisition line and a second grounding line, the general conversion module outputs a converted current signal to acquisition equipment, and the first acquisition line is connected to a point C of the sensor; the first grounding wire and the second grounding wire are connected to the grounding bus, the matched resistor switching module is connected between the grounding bus and the first acquisition wire, and the matched resistor switching module comprises a matched resistor R and a switching structure; when the adapter is connected to the two-wire system sensor, the matching resistor R is switched in between the C point of the two-wire system sensor and the grounding bus through the switching structure, and when the adapter is connected to the three-wire system sensor, the matching resistor R is switched out of the acquisition access through the switching structure, so that the B point of the three-wire system sensor is directly connected to the grounding bus.

Description

Technical Field

[0001] The present application belongs to the technical field of electrical measurement and control systems, and in particular relates to an adapter for converting multiple sensor signals into universal signals. Background Art

[0002] Data such as pressure or temperature at various parts of a launch vehicle need to be collected through sensors. Traditional launch vehicle designs generally adopt a customized development model for different signal launch vehicles. There are large differences in the application of sensors in various types of launch vehicles in service. There are different types of sensors between different models, between different devices of the same model, and even within the same device. For example, temperature sensors include two-wire sensors and three-wire sensors. Different conversion circuits and different acquisition circuits are used for sensors of different standards. This not only results in a large and complex collection device composition, a wide variety of interfaces, but also the lack of essential reliability caused by the non-universality of products.

[0003] The traditional sensor signal conversion method is customized. For example, for a two-wire temperature sensor, an RI signal isolator is usually used for the sensor signal transfer function. The 24V voltage received from the analog acquisition device is used to power the RI signal isolator. The RI signal isolator converts the change in the resistance of the temperature sensor at different temperatures into a 4-20mA analog signal, which is output to the analog acquisition device for collection, completing the transfer function of the two-wire temperature sensor. For a three-wire temperature sensor, a VI signal is usually used for the sensor signal transfer function. The 24V received from the analog acquisition device is used to power the VI signal isolator. At the same time, a power module is used to convert the 24V voltage into 5V, and 5V is used to power the three-wire temperature sensor. The three-wire sensor outputs a voltage in the range of 0-5V according to different temperatures. The VI signal isolator converts the 0-5V voltage into a 4-20mA analog signal, which is output to the analog acquisition device for collection, completing the transfer function of the three-wire temperature sensor. From the above two traditional methods, the inconsistent acquisition methods will lead to the disadvantages of large and complex components, a wide variety of interfaces, and non-universal products. Summary of the invention

[0004] The technical problem solved by the present application is: to overcome the shortcomings of the prior art and provide a method for designing an adapter for converting multiple sensor signals into universal signals. In view of the problems that the two-wire sensors and three-wire sensors used in current models need to be converted and collected by different devices, the types of devices are wide and the scale of devices is large, an adapter that can convert the two-wire sensor into a three-wire sensor is designed. At the same time, the adapter uses a universal conversion module to convert the sensor signal into a universal 4-20mA signal, which is output to the collection device for collection, thereby achieving the purpose of converting different types of sensor signals into universal signals.

[0005] The technical solutions provided by this application are as follows:

[0006] An adapter for converting multiple sensor signals into universal signals, used for converting the output signal of a two-wire sensor or a three-wire sensor into a current signal, wherein the two-wire sensor has two contacts, namely, point A and point C, and the three-wire sensor has contacts A, point B and point C, wherein point A is a +5V voltage signal, point C is a sensor output point, and point B of the three-wire sensor is a sensor output ground;

[0007] The adapter includes a power conversion module, a universal conversion module and a matching resistance switching module. The power conversion module is connected to a first power line, a first output line and a first ground line. The other end of the first power line is used to connect the acquisition device so that the acquisition device supplies power to the power conversion module. The power conversion module converts the voltage provided by the acquisition device into an input voltage of a two-wire sensor or a three-wire sensor, and then connects to point A of the two-wire sensor or the three-wire sensor through the first output line. The universal conversion module is connected to a second output line, a first acquisition line and a second ground line. The second output line is used to connect the acquisition device so that the acquisition device acquires the voltage through The current signal converted by the conversion module, the first acquisition line is connected to the C point of the two-wire sensor or the three-wire sensor; the first grounding line and the second grounding line are both connected to the grounding bus; the matching resistor switching module is connected between the grounding bus and the first acquisition line, and the matching resistor switching module includes a matching resistor R and a switching structure; when the adapter is connected to the two-wire sensor, the matching resistor R is cut into between the C point of the two-wire sensor and the grounding bus through the switching structure, and when the adapter is connected to the three-wire sensor, the matching resistor R is cut out of the acquisition path through the switching structure, so that the B point of the three-wire sensor is directly connected to the grounding bus;

[0008] The universal conversion module is used to convert the voltage signal from the two-wire sensor or the three-wire sensor into a current signal and output it to the acquisition device; the matching resistor switching module is used to adapt the signal acquisition of the two-wire and three-wire sensors to the universal conversion module.

[0009] The matching resistor switching module has matching resistor access point 1, matching resistor access point 2 and matching resistor access point 3, matching resistor access point 1 is connected to the ground bus, matching resistor access point 2 is connected to point C of a two-wire sensor or a three-wire sensor, and matching resistor access point 3 is used to connect to point B of a three-wire sensor;

[0010] The switching structure includes a single-pole double-throw switch, and the two ends of the matching resistor R are respectively connected to the matching resistor access point 1 and the matching resistor access point 3; the single-pole double-throw switch contains an input point, an output point 1 and an output point 2, the input point is connected to the matching resistor access point 3, the output point 1 is connected to the matching resistor access point 1, and the output point 2 is connected to the matching resistor access point 2; by switching the single-pole double-throw switch, the input point is connected to the output point 1, or the input point is connected to the output point 2.

[0011] When the adapter is connected to the two-wire sensor, the first output line is connected to point A of the two-wire sensor, the first acquisition line and the matching resistor access point 2 are both connected to point C of the two-wire sensor, and the ground bus is connected to the matching resistor access point 1. At this time, the single-pole double-throw switch of the matching resistor switching module is switched to connect the input point with the output point 2, so that the matching resistor R is cut in between point C of the two-wire sensor and the ground bus.

[0012] When the adapter is connected to the three-wire sensor, the first output line is connected to point A of the three-wire sensor, the ground bus is connected to the matching resistor access point 1, the matching resistor access point 3 is connected to point B of the three-wire sensor, and the first acquisition line and the matching resistor access point 2 are both connected to point C of the three-wire sensor. At this time, the single-pole double-throw switch of the matching resistor switching module is switched to connect the input point with the output point 1, so that point B of the three-wire sensor is directly connected to the ground bus.

[0013] The ground bus is connected to the matching resistor access point 1 of the matching resistor switching module, and is switched to the output point 2 through the single-pole double-throw switch, so that the ground bus is connected to the point C of the two-wire sensor through the matching resistor R.

[0014] The two-wire sensor comprises a first detection line, the first detection line is connected with a sensor thermistor R0, the sensor thermistor R0 changes resistance according to different temperatures, and the two ends of the first detection line are point A and point C respectively.

[0015] The three-wire sensor includes a second detection line, to which a sensor thermistor R0 and a resistor R1 are connected in sequence, and a third detection line is connected between the sensor thermistor R0 and the resistor R1, the other end of the third detection line is point C, and the two ends of the second detection line are points A and B respectively.

[0016] In summary, this application at least includes the following beneficial technical effects:

[0017] Aiming at the customized design of traditional sensor signal conversion methods, the present invention proposes an adapter design method for converting multiple sensor signals into universal signals. The two-wire sensor is converted into a three-wire sensor through simple circuit processing, so that it can use the same universal conversion module as the conventional three-wire sensor to convert the sensor signal into a 4-20mA signal. Converting different sensors into the same sensor and converting special sensors into universal ones simplifies the composition of the adapter and reduces the scale of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a two-wire temperature sensor acquisition method;

[0019] Figure 2 It is a three-wire temperature sensor acquisition method. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] In this embodiment, the two-wire sensor includes a first detection line, the first detection line is connected to a sensor thermistor R0, the sensor thermistor R0 can change its resistance according to different temperatures, and the two ends of the first detection line are points A and C respectively. The three-wire sensor includes a second detection line, the second detection line is connected to the sensor thermistor R0 and the resistor R1 in sequence, the second detection line is connected to a third detection line at a position between the sensor thermistor R0 and the resistor R1, the other end of the third detection line is point C, and the two ends of the second detection line are points A and B respectively.

[0022] The embodiment of the present application discloses an adapter for converting multiple sensor signals into universal signals, which is applicable to the design of a wired measurement and control system for a launch vehicle. The specific technical solution is as follows:

[0023] The adapter is composed of a power conversion module, a universal conversion module, and a matching resistance switching module; the power conversion module is connected to a first power line, a first output line, and a first ground line, the first power line is used to connect to a collection device so that the collection device supplies power to the power conversion module, and the power conversion module converts the 24V voltage provided by the collection device into a 5V voltage, and then connects to point A of a two-wire sensor or a three-wire sensor through the first output line. The universal conversion module is connected to a second output line, a first collection line, and a second ground line, the second output line is used to connect to the collection device so that the collection device collects the current signal converted by the universal conversion module, and the first collection line is connected to point C of a two-wire sensor or a three-wire sensor; the first ground line and the second ground line are both connected to a ground bus. The matching resistor switching module is connected between the ground bus and the first acquisition line, and the matching resistor switching module includes a matching resistor R and a switching structure; when the adapter is connected to a two-wire sensor, the matching resistor R is cut into the space between point C of the two-wire sensor and the ground bus through the switching structure; when the adapter is connected to a three-wire sensor, the matching resistor R is cut out of the acquisition path through the switching structure, so that point B of the three-wire sensor is directly connected to the ground bus; the matching resistor switching module is used to adapt the signal acquisition of two-wire and three-wire sensors to the universal conversion module. The universal conversion module is used to convert the voltage in the range of 0-5V from the two-wire sensor or the three-wire sensor into a 4-20mA current signal, and output it to the acquisition device.

[0024] The matching resistor switching module has matching resistor access point 1, matching resistor access point 2 and matching resistor access point 3, matching resistor access point 1 is connected to the ground bus, matching resistor access point 2 is connected to point C of a two-wire sensor or a three-wire sensor, and matching resistor access point 3 is used to connect point B of a three-wire sensor; the switching structure includes a single-pole double-throw switch, and both ends of the matching resistor R are respectively connected to matching resistor access point 1 and matching resistor access point 3; the single-pole double-throw switch contains an input point, an output point 1 and an output point 2, the input point is connected to matching resistor access point 3, the output point 1 is connected to matching resistor access point 1, and the output point 2 is connected to matching resistor access point 2; by switching the single-pole double-throw switch, the input point is connected to output point 1, or the input point is connected to output point 2.

[0025] When the adapter is connected to the two-wire sensor, the first output line is connected to point A of the two-wire sensor, the first acquisition line and the matching resistor access point 2 are both connected to point C of the two-wire sensor, and the ground bus is connected to the matching resistor access point 1. At this time, the single-pole double-throw switch of the matching resistor switching module is switched to connect the input point with the output point 2, so that the matching resistor R is cut in between point C of the two-wire sensor and the ground bus.

[0026] When the adapter is connected to the three-wire sensor, the first output line is connected to point A of the three-wire sensor, the ground bus is connected to the matching resistor access point 1, the matching resistor access point 3 is connected to point B of the three-wire sensor, and the first acquisition line and the matching resistor access point 2 are both connected to point C of the three-wire sensor. At this time, the single-pole double-throw switch of the matching resistor switching module is switched to connect the input point with the output point 1, so that point B of the three-wire sensor is directly connected to the ground bus.

[0027] The matching resistor R can convert the two-wire sensor into a three-wire sensor mode. The specific principle is as follows: Figure 1 As shown. The right part of the figure is the original two-wire temperature sensor, where R0 is the sensor thermistor, which can change resistance according to different temperatures. The two-wire sensor has two contacts, point A and point C. After connecting the adapter of this patent, it is equivalent to connecting a matching resistor R in series outside point C of the two-wire sensor, and the other side of the matching resistor R is the grounding point B', which is equivalent to converting the two-wire sensor into a three-wire sensor through the matching resistor switching module, which has three contacts, namely point A, point B', and point C.

[0028] The power conversion module converts the 24V voltage provided by the acquisition device into a 5V voltage, and uses the 5V voltage to power a three-wire sensor or a two-wire sensor after conversion using a matching resistor.

[0029] The 5V voltage can power points A and C of the converted two-wire sensor, such as Figure 1 As shown, point A is 5V, point B' is ground, and point C will output a voltage in the range of 0-5V, which will change with temperature.

[0030] 5V voltage can power three-wire sensors, such as Figure 2 As shown in the figure, when the three-wire sensor is supplied with 5V, the sensor will output a voltage in the range of 0-5V, which will change according to the change of temperature.

[0031] The universal conversion module is powered by the 24V voltage provided by the acquisition device; the universal conversion module can convert the voltage in the range of 0-5V into a 4-20mA current signal and output it to the acquisition device.

[0032] Both two-wire sensors and three-wire sensors can use the same adapter, achieving modularization and universalization.

[0033] The power conversion module, universal conversion module and two-wire sensor matching resistance circuit that constitute the device are simple and can be miniaturized and integrated.

[0034] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

[0035] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. An adapter for converting multiple sensor signals into a universal signal, characterized in that: It is used to convert the output signal of a two-wire sensor or a three-wire sensor into a current signal. The two-wire sensor has two contacts, namely point A and point C. The three-wire sensor has contacts A, B and C. Point A is a +5V voltage signal, point C is a sensor output point, and point B of the three-wire sensor is the sensor output ground. The adapter includes a power conversion module, a universal conversion module and a matching resistance switching module; A power conversion module is connected with a first power line, a first output line and a first ground line. The other end of the first power line is used to connect the acquisition device so that the acquisition device supplies power to the power conversion module. The power conversion module is used to convert the voltage provided by the acquisition device into an input voltage of a two-wire sensor or a three-wire sensor, and is connected to point A of the two-wire sensor or the three-wire sensor through the first output line. The first ground line is connected to the ground bus. The universal conversion module is connected with a second output line, a first acquisition line and a second ground line. The second output line is used to connect to an acquisition device so that the acquisition device acquires the current signal converted by the universal conversion module. The first acquisition line is connected to point C of a two-wire sensor or a three-wire sensor. The second ground line is connected to a ground bus. A matching resistor switching module is connected between the ground bus and the first acquisition line. The matching resistor switching module includes a matching resistor R and a switching structure. When the adapter is connected to a two-wire sensor, the matching resistor R is cut into between point C of the two-wire sensor and the ground bus through the switching structure. When the adapter is connected to a three-wire sensor, the matching resistor R is cut out of the acquisition path through the switching structure, so that point B of the three-wire sensor is directly connected to the ground bus.

2. The adapter for converting multiple sensor signals into a universal signal according to claim 1, characterized in that: The matching resistor switching module has matching resistor access point 1, matching resistor access point 2 and matching resistor access point 3, matching resistor access point 1 is connected to the ground bus, matching resistor access point 2 is connected to point C of a two-wire sensor or a three-wire sensor, and matching resistor access point 3 is used to connect to point B of a three-wire sensor; The switching structure includes a single-pole double-throw switch, and the two ends of the matching resistor R are respectively connected to the matching resistor access point 1 and the matching resistor access point 3; the single-pole double-throw switch contains an input point, an output point 1 and an output point 2, the input point is connected to the matching resistor access point 3, the output point 1 is connected to the matching resistor access point 1, and the output point 2 is connected to the matching resistor access point 2; by switching the single-pole double-throw switch, the input point is connected to the output point 1, or the input point is connected to the output point 2.

3. The adapter for converting multiple sensor signals into a universal signal according to claim 2, characterized in that: When the adapter is connected to the two-wire sensor, the first output line is connected to point A of the two-wire sensor, the first acquisition line and the matching resistor access point 2 are both connected to point C of the two-wire sensor, and the ground bus is connected to the matching resistor access point 1. At this time, the single-pole double-throw switch of the matching resistor switching module is switched to connect the input point with the output point 2, so that the matching resistor R is cut in between point C of the two-wire sensor and the ground bus.

4. The adapter for converting multiple sensor signals into a universal signal according to claim 2, characterized in that: When the adapter is connected to the three-wire sensor, the first output line is connected to point A of the three-wire sensor, the ground bus is connected to the matching resistor access point 1, the matching resistor access point 3 is connected to point B of the three-wire sensor, and the first acquisition line and the matching resistor access point 2 are both connected to point C of the three-wire sensor. At this time, the single-pole double-throw switch of the matching resistor switching module is switched to connect the input point with the output point 1, so that point B of the three-wire sensor is directly connected to the ground bus.

5. The adapter for converting multiple sensor signals into a universal signal according to claim 1, characterized in that: The two-wire sensor comprises a first detection line, the first detection line is connected with a sensor thermistor R0, the sensor thermistor R0 changes resistance according to different temperatures, and the two ends of the first detection line are point A and point C respectively.

6. The adapter for converting multiple sensor signals into a universal signal according to claim 1, characterized in that: The three-wire sensor includes a second detection line, to which a sensor thermistor R0 and a resistor R1 are connected in sequence, and a third detection line is connected between the sensor thermistor R0 and the resistor R1, the other end of the third detection line is point C, and the two ends of the second detection line are points A and B respectively.

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