CN212484124U - Variable resistance simulation device - Google Patents
Variable resistance simulation device Download PDFInfo
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- CN212484124U CN212484124U CN202021492458.0U CN202021492458U CN212484124U CN 212484124 U CN212484124 U CN 212484124U CN 202021492458 U CN202021492458 U CN 202021492458U CN 212484124 U CN212484124 U CN 212484124U
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Abstract
The utility model relates to the technical field of electric control test equipment, in particular to a variable resistance simulation device, which comprises a microcontroller, a control circuit, a switch device, a resistance channel, an interface circuit and a measured and controlled circuit; the microcontroller provides a control instruction of the control circuit and reads back feedback information of the control circuit; the control circuit is used for controlling the switching device to act; the switch devices are provided with a plurality of switches and used for receiving the control instruction sent by the control circuit and executing the switching action; the resistance channel is a matrix consisting of a plurality of resistors with different resistance values, and a switch is connected in series on each resistor; the interface circuit is connected with each resistance channel and used for introducing the resistance simulated by the resistance channels into the tested and controlled circuit.
Description
Technical Field
The utility model relates to an automatically controlled test equipment technical field specifically is a variable resistance analogue means.
Background
Along with the higher performance requirements of people on electric control products, the safety, reliability and economy of the products are more and more emphasized, and the requirements on testing means of the products are continuously improved. The digital signals, analog signals, sensor-like signals, loads, and various typical faults required by the periphery of a typical controller all require more realistic simulation. The resistance-type channel can simulate the signals of a temperature-type sensor at the periphery of the controller, and the controller is excited to operate the algorithm under the simulated temperature input. Most of the temperature signals are resistors which change along with the temperature, so that most of the current products provide a variable resistance output externally, the controller outputs an excitation signal, the current resistance value is detected, and an algorithm in the controller is introduced to participate in operation. The current variable resistor is mostly realized by switching a high-precision resistor matrix, and the requirement of the temperature sensor simulation with low precision requirement is basically met.
Because the types of the temperature sensors adopted by different controllers are different, the effective resistance ranges and the precision of the temperature sensors are different, and the existing solutions often have contradictions among the resistance ranges, the precision and the cost. Higher resistance accuracy requirements can lead to surge in product cost; and the solution with higher simulation precision has smaller simulatable resistance range and can not effectively cover the test range of users. High precision, large resistance range solutions, and unacceptable system costs. In view of this, we propose a variable resistance simulation device.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a variable resistance analogue means to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a variable resistance simulation device comprises a microcontroller, a control circuit, a switch device, a resistance channel, an interface circuit and a measured and controlled circuit;
the microcontroller is connected with the control circuit, provides a CAN channel for communication and control for the outside, provides a control instruction of the control circuit for the inside and reads back feedback information of the control circuit;
the control circuit is used for receiving a control instruction sent by the microcontroller, controlling the action of the switching device and simultaneously returning subsequent circuit information to the microcontroller;
the switch devices are connected to the control circuit and used for receiving the control instruction sent by the control circuit and executing the switching action;
each switch device is connected with the resistor channel, the resistor channel is a matrix formed by a plurality of resistors with different resistance values, and each resistor is connected with a switch in series;
the interface circuit is connected with each resistance channel and used for introducing the resistance simulated by the resistance channels into the measured and controlled circuit.
Preferably, the resistor channel is composed of a matrix of 24 resistors with different resistance values.
Preferably, the interface circuit comprises an electrostatic impeder and an over-current protector.
Compared with the prior art, the beneficial effects of the utility model are that: the variable resistance simulation device equivalently simulates different resistance values by using a parallel resistance matrix and matching with current-limiting and other protection devices and a switch switching mode under the condition of lower cost. Meanwhile, the resistors with different resistance values are selected, and channels with different resistance value ranges can be connected in parallel; the requirements on resistance precision and switch devices are effectively reduced, the scheme cost is greatly reduced, the circuit is simple and easy to realize, the topological structure is compact, the simulation of different types of temperature sensors can be realized, and the system testing efficiency is improved.
Drawings
FIG. 1 is a block diagram of the overall structure of the present invention;
fig. 2 is a schematic diagram of a connection structure of a control circuit in the present invention;
FIG. 3 is a schematic view of the connection structure of the middle resistor channel of the present invention;
fig. 4 is a schematic diagram of a connection structure of the interface circuit of the present invention.
In the figure: 1. a microcontroller; 2. a control circuit; 3. a switching device; 4. a resistive channel; 5. an interface circuit; 6. and a measured and controlled circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
A variable resistance simulation device is shown in figure 1 and comprises a microcontroller 1, a control circuit 2, a switching device 3, a resistance channel 4, an interface circuit 5 and a measured and controlled circuit 6;
the microcontroller 1 is connected with the control circuit 2, the microcontroller 1 is realized based on a single chip microcomputer, operates a control code of the device, provides a CAN channel for communication and control for the outside, and provides a control instruction of the control circuit 2 and feedback information of the control circuit 2 for readback;
as shown in fig. 2, the control circuit 2 is configured to receive a control instruction sent by the microcontroller 1, control the switching device 3 to operate, and simultaneously return subsequent circuit information to the microcontroller 1;
the switch devices 3 are connected to the control circuit 2, and configured to receive a control instruction sent by the control circuit 2 and execute a switching operation, in this embodiment, the number of the switch devices 3 is 4, which are SW1, SW2, SW3 and SW4, and the control signals Ctrl _1, Ctrl _2, Ctrl _3 and Ctrl _4 sent by the control circuit 2 control the on and off of the 4 switch devices 3 respectively;
as shown in fig. 3, each switching device 3 is connected with electricityThe resistance channel 4 is a matrix formed by a plurality of resistors with different resistance values, and each resistor is connected in series with a switch, in this embodiment, the resistance channel 4 is a matrix formed by 24 resistors with different resistance values, which are R0-R23, and the switches on each resistor are SW0-SW23 in turn, wherein the resistors are not connected in series on SW0, and it can be considered that the resistors R0 is 0 Ω, and the resistors R1-R23 are 2 Ω in turnn-1Ω ( n 1, 2 · 23), so that by different SWn ( n 1, 2 · 23) closing or opening controls, each resistive channel 4 can simulate a resistance value in the range 0-222Omega, the resolution is 1 omega;
as shown in fig. 4, the interface circuit 5 is connected to each resistance channel 4, and is configured to introduce the resistance simulated by the resistance channel 4 into the measured and controlled circuit 6, and the interface circuit 5 includes an electrostatic impeder and an overcurrent protector.
When the variable resistance simulation device of the embodiment is used, the microcontroller 1 receives an instruction sent by an upstream control system through the CAN, translates the instruction into an instruction of the back-end control circuit 2, and transmits the instruction to the control circuit 2;
the control circuit 2 further analyzes the command into an opening and closing command of the switching device according to the command, and drives the subsequent switching device 3 to act by combining a power supply system of the device;
the switch device 3 receives control signals Ctrl _1, Ctrl _2, Ctrl _3, Ctrl _4, etc. sent by the control circuit, and closes or opens the switches SW1, SW2, SW3, SW 4;
each resistance channel 4 comprises 24 switches, and each resistance channel 4 can simulate the resistance value range of 0-2 through the on-off control of different SWn22Omega, the resolution is 1 omega;
each resistance channel is finally connected with the measured controller 6 after the ESD protection and the overcurrent protection of the interface circuit, so that different resistance values can be equivalently simulated by a parallel resistance matrix in a manner of matching with current-limiting and other protection devices and switching. Meanwhile, the resistors with different resistance values are selected, and channels with different resistance value ranges can be connected in parallel; the requirements on resistance precision and switch devices are effectively reduced, the scheme cost is greatly reduced, the circuit is simple and easy to realize, the topological structure is compact, the simulation of different types of temperature sensors can be realized, and the system testing efficiency is improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A variable resistance simulation device is characterized by comprising a microcontroller (1), a control circuit (2), a switch device (3), a resistance channel (4), an interface circuit (5) and a measured and controlled circuit (6);
the microcontroller (1) is connected with the control circuit (2), provides a CAN channel for communication and control for the outside, provides a control instruction of the control circuit (2) for the inside, and reads back feedback information of the control circuit (2);
the control circuit (2) is used for receiving a control instruction sent by the microcontroller (1), controlling the switching device (3) to act, and simultaneously returning subsequent circuit information to the microcontroller (1);
the plurality of switch devices (3) are connected to the control circuit (2) and used for receiving a control instruction sent by the control circuit (2) and executing a switching action;
each switch device (3) is connected with the resistor channel (4), the resistor channel (4) is a matrix formed by a plurality of resistors with different resistance values, and each resistor is connected with a switch in series;
the interface circuit (5) is connected with each resistance channel (4) and used for introducing the resistance simulated by the resistance channels (4) into the measured and controlled circuit (6).
2. The variable resistance simulation device according to claim 1, wherein: the resistance channel (4) is composed of a matrix of 24 resistors with different resistance values.
3. The variable resistance simulation device according to claim 1, wherein: the interface circuit (5) comprises an electrostatic impeder and an overcurrent protector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021492458.0U CN212484124U (en) | 2020-07-24 | 2020-07-24 | Variable resistance simulation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021492458.0U CN212484124U (en) | 2020-07-24 | 2020-07-24 | Variable resistance simulation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030617A (en) * | 2021-03-10 | 2021-06-25 | 联合汽车电子（重庆）有限公司 | Intelligent multi-path inductive load card |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030617A (en) * | 2021-03-10 | 2021-06-25 | 联合汽车电子（重庆）有限公司 | Intelligent multi-path inductive load card |
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