Resistance simulation module with temperature compensation function based on PXI bus

Abstract

The utility model discloses a PXI bus-based resistance simulation module with a temperature compensation function. The PXI bus-based resistance simulation module comprises a switching circuit, a resistance network, a temperature compensation circuit and a master control circuit. According to the utility model, the PXI bus interface is in communication connection with an electronic test system based on a PXI bus, the switching circuit is controlled to work according to a received resistance control signal, and switching of different resistance values is controlled; meanwhile, the temperature compensation circuit monitors the environment temperature, performs resistance value compensation and outputs a corresponding temperature compensation signal, and the main control circuit controls the switching circuit to work according to the temperature compensation signal and a resistance control signal so as to automatically adjust the resistance value in the resistance simulation module, so that the resistance simulation precision can reach 0.125 ohm; the accuracy of a resistance simulation result is ensured, the flexibility and accuracy of an electronic test system are improved, and then the test efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic testing technical field especially, it relates to a resistance simulation module with temperature compensation function based on PXI bus. BACKGROUND

[0002] In the electronic testing field, the resistance needs to be simulated accurately, the traditional resistance simulation module has the problems of lacking temperature compensation function, compatibility with PXI bus and low integration, that is, the resistance value changes with temperature in different temperature environments, resulting in inaccurate resistance simulation results, reducing the flexibility and accuracy of the electronic testing system. UTILITY MODEL CONTENTS

[0003] The utility model discloses a resistance simulation module with temperature compensation function based on PXI bus, aiming at solving the problems of inaccurate resistance simulation results, low flexibility and accuracy of the electronic testing system caused by lacking temperature compensation, compatibility with PXI bus and low integration.

[0004] In order to realize the above-mentioned purpose, the utility model provides a resistance simulation module with temperature compensation function based on PXI bus, the resistance simulation module with temperature compensation function based on PXI bus includes:

[0005] Switching circuit and resistance network, the switching circuit is connected with the resistance network;

[0006] Temperature compensation circuit, the temperature compensation circuit is used for monitoring ambient temperature and outputting corresponding temperature compensation signal;

[0007] Master control circuit, the master control circuit is connected with the electronic testing system based on PXI bus through PXI bus interface, the control end of the master control circuit is connected with the switching circuit, and the master control circuit is also connected with the temperature compensation circuit, the master control circuit is used for receiving the resistance control signal sent by the electronic testing system based on PXI bus, and the switching circuit is controlled to work according to the temperature compensation signal and the resistance control signal, and the switching of different resistance values is controlled.

[0008] In an embodiment, the temperature compensation circuit includes:

[0009] Temperature sensor, the temperature sensor is used for detecting ambient temperature and outputting corresponding temperature detection signal;

[0010] Signal processor, the input end of the signal processor is connected with the temperature sensor, the output end of the signal processor is connected with the master control circuit, and the signal processor is used for signal processing to the temperature detection signal and outputs corresponding temperature compensation signal to the master control circuit.

[0011] In an embodiment, the temperature sensor is a thermistor.

[0012] In an embodiment, the resistance network comprises a plurality of high-precision resistors.

[0013] In an embodiment, the main control circuit is an FPGA.

[0014] The utility model discloses a PXI bus interface and the electronic test system based on the PXI bus establish communication connection, according to the resistance control signal received control switching circuit work, control the switching of different resistance value, simultaneously, through temperature compensation circuit monitoring ambient temperature and carry out resistance value compensation, output corresponding temperature compensation signal, and the main control circuit controls switching circuit work according to temperature compensation signal and resistance control signal, to automatically adjust the resistance value in resistance simulation module, makes resistance simulation precision can be as high as 0.125 ohm, to guarantee the accuracy of resistance simulation result, improve the flexibility and accuracy of electronic test system, and then improve test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is the whole block diagram of the utility model based on PXI bus's resistance simulation module with temperature compensation function;

[0016] Fig. 2 It is the two-wire system measurement method wiring terminal schematic drawing of the utility model based on PXI bus's resistance simulation module with temperature compensation function;

[0017] Fig. 3 It is the four-wire system measurement method wiring terminal schematic drawing of the utility model based on PXI bus's resistance simulation module with temperature compensation function. DETAILED DESCRIPTION

[0018] To make the purpose, technical scheme and advantage of the utility model embodiment clearer, below, the technical scheme in the utility model embodiment will be clearly and completely described with the drawings in the utility model embodiment. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. The components of the utility model embodiment described and shown in the drawing here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiment of the utility model provided in the drawing is not intended to limit the scope of the claimed utility model, but only represents the selected embodiment of the utility model. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of the protection of the utility model.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In the field of electronic testing, accurate simulation of resistance is required. Traditional resistance simulation modules have problems such as lack of temperature compensation function, low compatibility with PXI bus and low integration. That is, the resistance value changes with temperature under different temperature environments, resulting in inaccurate resistance simulation results, which reduces the flexibility and accuracy of electronic testing systems.

[0025] To address the aforementioned problems, this invention proposes a resistor simulation module with temperature compensation function based on the PXI bus. The specific embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0026] like Figs. 1-3 As shown, the resistance simulation module based on the PXI bus with temperature compensation function includes:

[0027] A switching circuit and a resistor network, wherein the switching circuit is connected to the resistor network;

[0028] A temperature compensation circuit is used to monitor the ambient temperature and output a corresponding temperature compensation signal.

[0029] A main control circuit is connected with the PXI bus-based electronic test system through a PXI bus interface, a control end of the main control circuit is connected with the switch circuit, and the main control circuit is also connected with the temperature compensation circuit.

[0030] In an embodiment, the temperature compensation circuit comprises:

[0031] A temperature sensor is configured to detect an ambient temperature and output a corresponding temperature detection signal.

[0032] A signal processor is connected with the temperature sensor at an input end and connected with the main control circuit at an output end, and is configured to perform signal processing on the temperature detection signal and output a corresponding temperature compensation signal to the main control circuit.

[0033] In an embodiment, the temperature sensor is a thermistor.

[0034] In an embodiment, the resistance network comprises a plurality of high-precision resistors.

[0035] In an embodiment, the main control circuit is an FPGA.

[0036] In the embodiment, the PXI bus is a high-performance instrument bus standard and is widely used in various test and measurement systems; the main control circuit can be implemented by using an MCU, a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), an SOC (System On Chip), etc., and the main control circuit in the embodiment is preferably implemented by using an FPGA to control and manage the resistance simulation module. In the embodiment, the main control circuit is connected with the PXI bus-based electronic test system through a PXI (PCI extensions for Instrumentation) bus interface, so that the resistance simulation module can be quickly integrated into the PXI bus-based electronic test system, the compatibility and integration between the resistance simulation module and the electronic test system are improved, and the overall performance and expansibility of the electronic test system are improved.

[0037] In the embodiment, the resistance network can be implemented by multiple high-precision resistors to accurately simulate resistors with various different resistance values; the switching circuit can be implemented by a triode or a MOS transistor; and the temperature compensation circuit can be any temperature compensation circuit that can monitor the ambient temperature and compensate the resistance of the resistance simulation module accordingly, such as a temperature sensor and a signal processing circuit. The temperature sensor in the embodiment is implemented by a thermistor to collect the ambient temperature. The thermistor generates a corresponding temperature detection signal according to the change of the temperature, which is used for subsequent temperature compensation. The signal processing circuit can be implemented by a DSP to access the temperature detection signal and perform corresponding signal processing. The least square method is used to fit a polynomial function between the coefficients and the temperature, and a temperature-resistance value mapping table is generated and pre-stored. It can be understood that the main control circuit accesses the resistance control signal sent by the PXI bus-based electronic test system through the PXI bus interface, controls the switching circuit to work according to the resistance control signal, controls the switching to the preset resistance value, and simulates the corresponding resistance characteristics. The temperature compensation circuit continuously monitors the ambient temperature. When the temperature changes, the signal processing circuit compensates the resistance value of the resistance simulation module according to the preset temperature-resistance value mapping table, to ensure the accuracy of the resistance simulation under different temperature conditions. Specifically, in a high-temperature environment, the temperature compensation circuit will correspondingly reduce the resistance value of the resistance simulation circuit to offset the resistance change caused by the temperature rise. In a low-temperature environment, the temperature compensation circuit will correspondingly increase the resistance value of the resistance simulation circuit. In this way, the PXI bus-based resistance simulation module with temperature compensation function can provide accurate and stable resistance simulation function, and the resistance simulation accuracy can reach 0.125 ohm.

[0038] In the embodiment, the PXI bus-based resistance simulation module with temperature compensation function has 9 channels of analog resistance output, and each resistance output channel supports two-wire and four-wire measurement method analog output. Fig. 2 For two-wire measurement method analog output, Rin and Rout are two-wire measurement connection terminals, and the structure is simpler. Fig. 3 For four-wire measurement method analog output, Rin, Rin_S, Rout and Rout_S are four-wire measurement connection terminals, which can effectively reduce the interference of power fluctuation on the signal, so that the signal transmission is more stable.

[0039] The resistance simulation module with temperature compensation function based on the PXI bus is connected with the electronic test system based on the PXI bus through the PXI bus interface, and the switching circuit is controlled to work according to the received resistance control signal, and the switching of different resistance values is controlled; meanwhile, the temperature compensation circuit monitors the ambient temperature and compensates the resistance value, and outputs the corresponding temperature compensation signal, and the main control circuit controls the switching circuit to work according to the temperature compensation signal and the resistance control signal, so that the resistance value in the resistance simulation module is automatically adjusted, the resistance simulation precision can be as high as 0.125 ohm, the accuracy of the resistance simulation result is ensured, the flexibility and accuracy of the electronic test system are improved, and the test efficiency is improved.

[0040] In summary, the resistance simulation module with temperature compensation function based on the PXI bus is connected with the electronic test system based on the PXI bus through the PXI bus interface, and the switching circuit is controlled to work according to the received resistance control signal, and the switching of different resistance values is controlled; meanwhile, the temperature compensation circuit monitors the ambient temperature and compensates the resistance value, and outputs the corresponding temperature compensation signal, and the main control circuit controls the switching circuit to work according to the temperature compensation signal and the resistance control signal, so that the resistance value in the resistance simulation module is automatically adjusted, the resistance simulation precision can be as high as 0.125 ohm, the accuracy of the resistance simulation result is ensured, the flexibility and accuracy of the electronic test system are improved, and the test efficiency is improved.

[0041] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled person in the art, without departing from the technical principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements should be regarded as the protection scope of the utility model.

Claims

1. A PXI bus-based resistance simulation module with temperature compensation function, characterized in that, The PXI bus-based resistance simulation module with temperature compensation function comprises: a switching circuit and a resistance network, the switching circuit being connected with the resistance network; a temperature compensation circuit for monitoring ambient temperature and outputting a corresponding temperature compensation signal; a main control circuit in communication connection with a PXI bus-based electronic test system through a PXI bus interface, a control end of the main control circuit being connected with the switching circuit, the main control circuit also being connected with the temperature compensation circuit, the main control circuit being used for receiving a resistance control signal sent by the PXI bus-based electronic test system and controlling the switching circuit to work according to the temperature compensation signal and the resistance control signal to control switching of different resistance values.

2. The PXI bus-based resistance simulation module with temperature compensation function according to claim 1, characterized in that, The temperature compensation circuit comprises: a temperature sensor for detecting ambient temperature and outputting a corresponding temperature detection signal; a signal processor, an input end of the signal processor being connected with the temperature sensor, an output end of the signal processor being connected with the main control circuit, the signal processor being used for signal processing of the temperature detection signal and outputting a corresponding temperature compensation signal to the main control circuit.

3. The PXI bus-based resistance simulation module with temperature compensation function according to claim 2, characterized in that, The temperature sensor is a thermistor.

4. The PXI bus-based resistance simulation module with temperature compensation function according to claim 1, characterized in that, The resistance network comprises a plurality of high-precision resistors.

5. The PXI bus-based resistance simulation module with temperature compensation function according to claim 1, characterized in that, The main control circuit is an FPGA.

Images