CN213632485U

CN213632485U - Acquisition system of capacitive torque sensor

Info

Publication number: CN213632485U
Application number: CN202022626639.4U
Authority: CN
Inventors: 许纪湖; 陆祖嘉; 卢美铭; 曾垂喜; 张琦伟; 潘海鸿
Original assignee: Guangxi Anbote Intelligent Technology Co ltd
Current assignee: Guangxi Anbote Intelligent Technology Co ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-07-06
Anticipated expiration: 2030-11-13

Abstract

The utility model discloses a capacitanc torque sensor's collection system, its include received signal's electric capacity collection module, with the optoelectronic isolation module that electric capacity collection module links to each other, with the host system that the optoelectronic isolation module links to each other, with host system links to each other and the communication module of output signal and be used for respectively for the power module of electric capacity collection module, host system and communication module power supply, the utility model discloses have electrical isolation and anti-interference function, guaranteed electric capacity collection signal's accuracy and reliability.

Description

Acquisition system of capacitive torque sensor

Technical Field

The utility model relates to a signal acquisition field, concretely relates to a system for be used for gathering electric capacity signal.

Background

The capacitive torque sensor is designed based on the principle of a capacitor, when the sensor is stressed and deformed, the distance between a moving electrode and a static electrode changes, the capacitance formed by the moving electrode and the static electrode also changes correspondingly, and the change of the torque is calculated by measuring the capacitance.

However, the existing signal acquisition is easily subjected to conducted interference, and the conducted interference shows that after the sensor is arranged on the shell, if a hand or other objects contact the shell of the sensor, the acquired signal of the sensor can jump, and the interference brings about measurement errors, so that the stability of the system is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electric capacity collection system with jam-proof effect.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the acquisition system of the capacitive torque sensor comprises a capacitance acquisition module for receiving signals, a photoelectric isolation module connected with the capacitance acquisition module, a main control module connected with the photoelectric isolation module, a communication module connected with the main control module and outputting signals, and a power supply module respectively used for supplying power to the capacitance acquisition module, the main control module and the communication module.

The power isolation module is connected with a power module for supplying power to the capacitance acquisition module.

The capacitance acquisition module comprises a capacitance digital converter chip of AD7147 model.

The optoelectronic isolation module comprises a TLP2362 optocoupler and a triode.

The main control module comprises a single chip microcomputer of STM32F103C8T6 model.

After the technical scheme is adopted, compared with the background art, the utility model, have following advantage:

the utility model discloses an electrical isolation has solved conducted interference's problem well, and the singlechip passes through the opto-coupler with the control signal who gathers the chip promptly and keeps apart, and the power passes through DC-DC module and keeps apart, makes the front end of gathering keep apart and independent, has electrical isolation and interference killing feature, has guaranteed the accuracy and the reliability of gathering the signal.

Drawings

Fig. 1 is a schematic diagram of the overall module of the present invention;

fig. 2 is a circuit diagram of the capacitor collection module of the present invention;

fig. 3 is a circuit diagram of the optoelectronic isolation module of the present invention;

fig. 4 is a circuit diagram of the main control module of the present invention;

fig. 5 is a circuit diagram of the communication module of the present invention;

fig. 6 is a circuit diagram of the power module and the power isolation module of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Examples

Please refer to fig. 1, the utility model discloses a capacitanc torque sensor's collection system, it is including the electric capacity collection module who connects electric capacity sensor, the optoelectronic isolation module who links to each other with electric capacity collection module, the host system who links to each other with optoelectronic isolation module, communication module and the power module who links to each other with host system, power module is including being used for the power module 2 of electric capacity collection module power supply and being used for communication module, the power module 1 of host system power supply, power module 2 connects the power isolation module.

As shown in fig. 2, the capacitance collection module includes a capacitance-to-digital converter (CDC) chip U6 with a model number AD7147,

pins

1, 2, 5, and 6 of the chip U6 are respectively connected to the output terminal of the capacitance sensor to receive a capacitance signal output by the capacitance sensor, and

pins

13, 14, 15, and 16 of the chip U6 are respectively connected to the output terminal of the photoelectric isolation module in the 12-pin power module 2 of the chip U6.

As shown in fig. 3, the optoelectronic isolation module includes an optocoupler U5 of TLP2362 type, an optocoupler U7, an optocoupler U9, an optocoupler U10 and a triode Q1; a 1 st pin of the optocoupler U5 is connected with a power supply module 1 through a resistor R24, a 3 rd pin is connected with the main control module, a 4 th pin is grounded, and a 5 th pin is connected with the capacitance acquisition module through a resistor R23; the 6 th pin is grounded through electric capacity C13 on the one hand, and on the other hand connects electric capacity collection module, and optocoupler U7, U9's connected mode are on the same side, and the 5 th pin of optocoupler U10 is connected the main control module, and the 1 st pin passes through resistance R30 and connects triode Q1's collecting electrode, and electric capacity collection module is connected to triode Q1's projecting pole.

As shown in fig. 4, the main control module adopts an STM32F103C8T6 model single chip microcomputer U1, the STM32F103C8T6 is a 32-bit microcontroller based on ARM Cortex-M core STM32 series, the capacity of a program memory is 64KB, the capacity of a RAM is 20KB, and the required voltage is 2V-3.6V. Has 3-way UASRT and 1-way CAN interfaces. The photoelectric isolation module is connected to singlechip U1's 14 ~ 17 pin, gathers the chip through the SPI communication protocol control chip U6 electric capacity, reads the capacitance value that electric capacity gathered chip AD7147 gathered, and through the operation processing turn into digital signal, singlechip U1's 1 st, 24, 36, 48, 9 pin connect power module 1, singlechip U1's 22, 18, 21 pin connect communication module.

As shown in FIG. 5, the communication module comprises an SP3485 chip U2, the 8 th pin of the chip U2 is connected with the power module 1, the 1 st to 4 th pins of the chip U2 are connected with the single chip microcomputer U1 of the main control module, the 6 th and 7 th pins of the communication chip are connected with an interface CN2, and the sensor data are transmitted outwards through an MODBUS communication protocol.

As shown in fig. 6, the power module 1 adopts a HT7333-7 voltage-stabilized power chip U4, the output end of the power module is connected to the main control module and the communication module, the input voltage of the power module 1 is 5V, the voltage is linearly reduced to 3V3 by the HT7333-7 voltage-stabilized power chip to supply power to the main control module and the communication module, the power module 2 adopts a HT7333-7 power chip U8, the output end of the power module is connected to the photoelectric isolation module and the capacitance collection module, the input end of the power module is connected to the 5V power output by the power isolation module, the voltage is linearly reduced to 3V3 by the HT7333-7 voltage-stabilized power chip to supply power to the photoelectric isolation module and the CDC chip, the power isolation module includes a dc converter, the current power is converted from 5V of the sensor communication line to 3.3V power by the LDO, the control interface and the power interface of the capacitance collection, the collection of the capacitance signal is influenced, therefore, an isolation mode is adopted, the power supply 5VDC is isolated to 5VDC, and the SPI control interface is isolated by optical coupling.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. Capacitanc torque sensor's collection system, its characterized in that: the device comprises a capacitance acquisition module for receiving signals, a photoelectric isolation module connected with the capacitance acquisition module, a main control module connected with the photoelectric isolation module, a communication module connected with the main control module and outputting signals, and a power supply module respectively used for supplying power to the capacitance acquisition module, the main control module and the communication module.

2. The acquisition system of a capacitive torque sensor according to claim 1, wherein: the power isolation module is connected with a power module for supplying power to the capacitance acquisition module.

3. The acquisition system of a capacitive torque sensor according to claim 2, wherein: the capacitance acquisition module comprises a capacitance digital converter chip of AD7147 model.

4. The acquisition system of a capacitive torque sensor according to claim 3, wherein: the optoelectronic isolation module comprises a TLP2362 optocoupler and a triode.

5. The acquisition system of a capacitive torque sensor according to claim 4, wherein: the main control module comprises a single chip microcomputer of STM32F103C8T6 model.