An adapter that converts signals from multiple sensors into a universal signal.

Abstract

An adapter converts signals from multiple sensors into a universal signal. A power conversion module converts the voltage provided by the acquisition device into the sensor's input voltage, which is then connected to point A of the sensor via a first output line. A universal conversion module connects to a second output line, a first acquisition line, and a second grounding line, outputting the converted current signal to the acquisition device. The first acquisition line is connected to point C of the sensor. The first and second grounding lines are 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 switching structure switches the matching resistor R between point C of the two-wire sensor and the ground bus. When the adapter is connected to a three-wire sensor, the switching structure switches the matching resistor R out of the acquisition path, allowing point B of the three-wire sensor to be directly connected to the ground bus.

Description

Technical Field

[0001] This application belongs to the field of electrical measurement and control system technology, and specifically relates to an adapter that converts multiple sensor signals into a general signal. Background Technology

[0002] Data such as pressure and temperature in various parts of a launch vehicle need to be collected by sensors. Traditional launch vehicle design generally adopts a customized development model driven by different signal launch vehicles. There are significant differences in the application of sensors among different models of launch vehicles in service. Different models, different devices within the same model, and even within the same device, use different types of sensors. For example, temperature sensors include two-wire and three-wire sensors. Different conversion circuits and different acquisition circuits are used for different types of sensors. This not only results in a large and complex collection of data acquisition equipment with a wide variety of interfaces, but also causes inherent reliability problems due to the lack of product interoperability.

[0003] Traditional sensor signal conversion methods are customized. For example, for two-wire temperature sensors, an RI signal isolator is typically used for signal conversion. The RI isolator is powered by the 24V voltage received from the analog acquisition device. The RI isolator converts the resistance change of the temperature sensor at different temperatures into a 4-20mA analog signal, which is then output to the analog acquisition device for acquisition, thus completing the conversion function for two-wire temperature sensors. For three-wire temperature sensors, a VI signal isolator is typically used. The VI isolator is powered by the 24V voltage received from the analog acquisition device. Simultaneously, a power module converts the 24V voltage to 5V, which powers the three-wire temperature sensor. The three-wire sensor outputs a voltage within the 0-5V range depending on the temperature. The VI isolator converts this 0-5V voltage into a 4-20mA analog signal, which is then output to the analog acquisition device for acquisition, completing the conversion function for three-wire temperature sensors. These two traditional methods, with their inconsistent acquisition methods, result in large and complex components, numerous interface types, and a lack of product universality. Summary of the Invention

[0004] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide an adapter design method for converting multiple sensor signals into general signals. Addressing the issues of the current models using two-wire and three-wire sensors requiring signal conversion and acquisition through different devices, the large variety of devices, and the large scale of the equipment, this application designs an adapter that can convert two-wire sensors into three-wire sensors. Simultaneously, the adapter uses a general conversion module to convert the sensor signals into a general 4-20mA signal, which is then output to the acquisition device for acquisition, thus achieving the purpose of converting different types of sensor signals into general signals.

[0005] The technical solution provided in this application is as follows:

[0006] An adapter for converting signals from multiple sensors into a universal signal is provided. 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, A and C, and the three-wire sensor has contacts A, B, and C. Point A is a +5V voltage signal, point C is the sensor output point, and point B of the three-wire sensor is the sensor output ground.

[0007] The adapter includes a power conversion module, a universal conversion module, and a matching resistor 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 to the data acquisition device so that the data acquisition device can supply power to the power conversion module. The power conversion module converts the voltage provided by the data acquisition device into the input voltage of a two-wire or three-wire sensor, and then connects to point A of the two-wire or 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 to the data acquisition device so that the data acquisition device can acquire data. The current signal converted by the conversion module is connected to point C of a two-wire or three-wire sensor via a first acquisition line. Both the first and second grounding lines are connected to the 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 switched between point C of the two-wire sensor and the ground bus via the switching structure. When the adapter is connected to a three-wire sensor, the matching resistor R is switched out of the acquisition path via the switching structure, so that point B of the three-wire sensor is directly connected to the ground bus.

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

[0009] The matching resistor switching module has a matching resistor access point 1, a matching resistor access point 2, and a matching resistor access point 3. The matching resistor access point 1 is connected to the ground bus, the matching resistor access point 2 is connected to point C of a two-wire sensor or a three-wire sensor, and the 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 (SPDT) switch, with the two ends of the matching resistor R connected to matching resistor access point 1 and matching resistor access point 3 respectively. The SPDT switch has an input point, an output point 1, and an output point 2. The input point is connected to matching resistor access point 3, output point 1 is connected to matching resistor access point 1, and output point 2 is connected to matching resistor access point 2. By switching the SPDT switch, the input point is connected to output point 1, or the input point is connected to 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 and the output point 2, so that the matching resistor R is switched 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 and the output point 1, so that point B of the three-wire sensor is directly connected to the ground bus.

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

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

[0015] The three-wire sensor includes a second detection line, on which a sensor thermistor R0 and a resistor R1 are connected in sequence. 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 includes at least the following beneficial technical effects:

[0017] This invention addresses the customized design of traditional sensor signal conversion methods by proposing an adapter design method for converting multiple sensor signals into a universal signal. It transforms a two-wire sensor into a three-wire sensor through simple circuit processing, enabling it to use the same universal conversion module as conventional three-wire sensors to convert sensor signals into 4-20mA signals. By converting different sensors into a single sensor and transforming specialized into general-purpose signals, this invention simplifies the adapter's structure and reduces the scale of the equipment. Attached Figure Description

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

[0019] Figure 2 It uses a three-wire temperature sensor for data acquisition. Detailed Implementation

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

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

[0022] This application discloses an adapter that converts signals from multiple sensors into a universal signal, suitable for the design of wired telemetry and control systems for launch vehicles. The specific technical solution is as follows:

[0023] The adapter consists of a power conversion module, a universal conversion module, and a matching resistor 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 the data acquisition device, enabling the device to power the power conversion module. The power conversion module converts the 24V voltage provided by the data acquisition device to 5V, which is then connected to point A of a two-wire or three-wire sensor via 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 to the data acquisition device, enabling the device to acquire the current signal converted by the universal conversion module. The first acquisition line is connected to point C of the two-wire or three-wire sensor. Both the first and second ground lines are connected to the ground bus. The matching resistor switching module is connected between the ground bus and the first acquisition line. The module includes a matching resistor R and a switching structure. When the adapter is connected to a two-wire sensor, the switching structure switches the matching resistor R between point C of the two-wire sensor and the ground bus. When the adapter is connected to a three-wire sensor, the switching structure switches the matching resistor R out of the acquisition path, allowing point B of the three-wire sensor to be directly connected to the ground bus. The matching resistor switching module is used to adapt the signal acquisition from two-wire and three-wire sensors to the universal conversion module. The universal conversion module converts the 0-5V voltage from the two-wire or three-wire sensor into a 4-20mA current signal, which is then output to the acquisition device.

[0024] The matching resistor switching module has matching resistor access points 1, 2, and 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 or 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, with the two ends of the matching resistor R connected to matching resistor access points 1 and 3 respectively. The single-pole double-throw switch has an input point, an output point 1, and an output point 2. The input point is connected to matching resistor access point 3, output point 1 is connected to matching resistor access point 1, and 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 and the output point 2, so that the matching resistor R is switched 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 and 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 a two-wire sensor into a three-wire sensor mode. The specific principle is as follows: Figure 1 As shown in the diagram, the right side represents the original two-wire temperature sensor, where R0 is the thermistor, whose resistance changes with temperature. The two-wire sensor has two contacts, A and C. Connecting the adapter of this patent is equivalent to connecting a matching resistor R in series outside point C of the two-wire sensor. The other side of the matching resistor R is the ground point B'. This effectively transforms the two-wire sensor into a three-wire sensor via the matching resistor switching module, giving it three contacts: A, B', and C.

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

[0029] A 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 according to the temperature.

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

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

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

[0033] The power conversion module, general conversion module, and two-wire sensor matching resistor circuit that make up this device are simple and can be miniaturized and integrated.

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

[0035] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

Claims

1. An adapter for converting signals from multiple sensors into a universal signal, characterized in that: Used to convert the output signal of a two-wire or 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 the 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 resistor 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 to the acquisition device so that the acquisition device can supply power to the power conversion module. The power conversion module is used to convert the voltage provided by the acquisition device into the 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 to 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 can acquire 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 the ground bus. The 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 switched 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 switched 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 a matching resistor access point 1, a matching resistor access point 2, and a matching resistor access point 3. The matching resistor access point 1 is connected to the ground bus, the matching resistor access point 2 is connected to point C of a two-wire sensor or a three-wire sensor, and the 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 (SPDT) switch, with the two ends of the matching resistor R connected to matching resistor access point 1 and matching resistor access point 3 respectively. The SPDT switch has an input point, an output point 1, and an output point 2. The input point is connected to matching resistor access point 3, output point 1 is connected to matching resistor access point 1, and output point 2 is connected to matching resistor access point 2. By switching the SPDT switch, the input point is connected to output point 1, or the input point is connected to output point 2.

3. An 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 and the output point 2, so that the matching resistor R is switched between point C of the two-wire sensor and the ground bus.

4. An 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 and the output point 1, so that point B of the three-wire sensor is directly connected to the ground bus.

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

6. An 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, on which a sensor thermistor R0 and a resistor R1 are connected in sequence. 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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