CN219609194U - Multichannel wireless test calibrating device - Google Patents

Abstract

The utility model aims to provide a multichannel wireless test calibration device which is small in size and free from small limit of space of a connecting wire harness. The intelligent power supply comprises a power supply module, an MCU module, an acquisition module, a measurement interface unit and a wireless communication module, wherein the acquisition module and the wireless communication module are both connected with an MCU module through electric signals, the power supply module supplies power, the wireless communication module is communicated with an external upper computer, the measurement interface unit comprises a current transformer matched with a public node of a product to be detected and a multichannel conduction selection module, the input end of the multichannel conduction selection module is correspondingly connected with a plurality of products to be detected, and the output ends of the current transformer and the multichannel conduction selection module are connected with the input end of the acquisition module through a switch. The utility model is applied to the technical field of power supply cabinets and battery test calibration.

Description

Multichannel wireless test calibrating device

Technical Field

The utility model is applied to the technical field of power supply cabinets and battery test calibration, and particularly relates to a multichannel wireless test calibration device.

Background

In the electronic equipment testing industry and new energy battery testing, the power cabinet and the battery (the tested product) often need to measure up to tens of paths of voltage and current even more so as to judge the charge and discharge state of the current battery and whether the current battery meets the related parameter requirements, thereby further judging the quality of the battery. In order to ensure that the accuracy of the detection results, i.e. the voltage and current data, is required to meet the requirements within a specific range, the power cabinet needs to be subjected to system calibration, and then a multi-channel test calibration device is necessary.

In most of the current calibration schemes and calibration tools, the standard source is basically a desk-top multimeter, and when the cost of the instrument is high, the following situations are encountered: 1. the size of the calibration tool is strictly limited, and is not enough to put down a common standard desk-type universal meter; 2. the calibration fixture cannot be externally provided with a cable due to actual production requirements. Therefore, even with the availability of a table multimeter, powering and cruising the instrument is a problem.

What is needed is a calibration device that can replace a standard bench-top multimeter to achieve multichannel calibration and that is compact enough to meet installation space requirements without requiring the connection of too many external cables.

Disclosure of Invention

The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing a multi-channel wireless test calibration device which is small in size and free from the small limitation of the space of a connecting wire harness.

The technical scheme adopted by the utility model is as follows: the intelligent power supply comprises a power supply module, an MCU module, an acquisition module, a measurement interface unit and a wireless communication module, wherein the acquisition module and the wireless communication module are both connected with an MCU module through electric signals, the power supply module supplies power, the wireless communication module is communicated with an external upper computer, the measurement interface unit comprises a current transformer matched with a public node of a product to be detected and a multichannel conduction selection module, the input end of the multichannel conduction selection module is correspondingly connected with a plurality of products to be detected, and the output ends of the current transformer and the multichannel conduction selection module are connected with the input end of the acquisition module through a switch.

According to the scheme, the test calibration module in the form of the board card is connected with the product to be tested to collect voltage and current data, so that the standard desk-top multimeter substitution equipment which meets the accuracy requirement and is easy to realize self calibration is provided. The power module is used for providing electric energy for each module so that each module can work normally. The MCU module is used for coordinating the work of each module and communicating with an external upper computer. The MCU module is used for switching the battery unit to be tested which is conducted with the acquisition module through the measurement interface unit and the change-over switch, the acquisition module is used for acquiring current and voltage parameters of the current conducting channel, an operator is used for carrying out system calibration of the power cabinet by acquiring calibration parameters through the upper computer, and then normal operation of battery products in the power cabinet is guaranteed. And switching between the current transformer and the multichannel conduction selection module is performed through the change-over switch, so that measurement and calibration of current or voltage are respectively performed.

The MCU module is connected with the plurality of selection relays and the control end of the change-over switch through the IO expander, and the selection relays are switched to enable the product to be detected, which is connected with the corresponding input end, to be conducted with a group of input ends of the change-over switch.

In one preferred scheme, attenuation modules are arranged between the current transformer and the corresponding input ends of the multichannel conduction selection module and between the multichannel conduction selection module and the corresponding input ends of the change-over switch.

Preferably, the power module includes a charging power supply.

The utility model also comprises a self-calibration module, wherein the self-calibration module comprises an external interface and a DAC module connected with the MCU module, the output end of the DAC module is connected with the input end of the acquisition module through a calibration switch, and the external interface is connected to the output ends of the change-over switch and the calibration switch through a detection switch.

In a preferred embodiment, the wireless communication module includes a wireless transceiver unit having a model number YL-500 IL.

In a preferred embodiment, the present utility model further includes a memory communicatively coupled to the MCU module, the memory storing calibration parameters of the self-calibration module.

Drawings

FIG. 1 is a system block diagram of the present utility model;

FIG. 2 is a schematic circuit diagram of the power module;

FIG. 3 is a schematic circuit diagram of a first connector portion of the MCU module;

FIG. 4 is a schematic circuit diagram of the measurement interface unit;

FIG. 5 is a schematic circuit diagram of a second connector portion of the MCU module;

FIG. 6 is a schematic circuit diagram of the self-calibration module;

FIG. 7 is a schematic circuit diagram of a third connector portion of the MCU module;

FIG. 8 is a schematic circuit diagram of the memory;

fig. 9 is a schematic circuit diagram of the portal unit.

Detailed Description

As shown in fig. 1 to 9, in this embodiment, the present utility model includes a power module 1, an MCU module 2, an acquisition module 3, a measurement interface unit 4, and a wireless communication module 5, where the acquisition module 3 and the wireless communication module 5 are both electrically connected to the MCU module 2, the power module 1 supplies power, the wireless communication module 5 communicates with an external host computer, the measurement interface unit 4 includes a current transformer 41 matched with a common node of a product to be measured, and a multi-channel conduction selection module 42, an input end of the multi-channel conduction selection module 42 is correspondingly connected to a plurality of products to be measured, and output ends of the current transformer 41 and the multi-channel conduction selection module 42 are connected to an input end of the acquisition module 3 through a switch. The MCU module comprises a processing chip with the model of STM32F103RCT6, and the acquisition module 3 comprises an analog-to-digital converter with the model of AD 7175.

The multi-channel conduction selection module 42 comprises three groups of selection relays, the MCU module 2 is connected with three groups of selection relays and the control end of the change-over switch through the IO expander 6, the IO expander 6 is an IO expansion chip with the model of CAT9555YI-T2, and the selection relays are switched to be connected to enable products to be detected, which are connected with corresponding input ends, to be conducted with one group of input ends of the change-over switch.

An attenuation module 7 is arranged between the current transformer 41 and the corresponding input ends of the multichannel conduction selection module 42 and the change-over switch, the attenuation module 7 comprises an operational amplifier with the model of OPA188AIDBVR, attenuation of an input voltage signal is achieved through the attenuation module 7, and in the embodiment, the attenuation multiplying power of the attenuation module 7 is 2/3 times.

The power module 1 comprises a charging power supply, the charging power supply is a 12V/95AH lithium battery integrated machine, the whole size is 31x21x6cm, the lithium battery integrated machine is used for supplying power to the whole device, the equipment can continuously work for a period of time under the condition that a power supply circuit is not required to be connected, and the battery can provide continuous voyage for about 7-10 days after being fully charged under the condition of the function of the lithium battery integrated machine of the model, so that the equipment space requirement under the specific condition is met. Meanwhile, the wireless communication module 5 is adopted to carry out data communication and communicate with a wireless module at the upper computer end of the computer, so that the wireless communication device can be flexibly used in an automatic test factory building, does not have an external cable, and can not cause the problems of wire harness winding, wire tripping and the like in the carrying and moving processes.

The utility model further comprises a self-calibration module, the self-calibration module comprises an external interface 8 and a DAC module 9 connected with the MCU module 2, the DAC module 9 comprises a digital-to-analog conversion chip with the model of AD5663BRMZ, the output end of the DAC module 9 is connected with the input end of the acquisition module 3 through a calibration switch, the MCU module 2 is set to switch the DAC module 9 on and off through the calibration switch, the DAC module is prevented from interfering with a measurement result, the external interface 8 is connected to the switch and the output end of the calibration switch through a detection switch, and is matched with an external desk-type multimeter through the external interface 8, so that parameter correction is carried out in a self-calibration process, data collection is carried out through the external desk-type multimeter in a debugging process, and the like.

The wireless communication module 5 comprises a wireless receiving and transmitting unit with the model number of YL-500IL, the wireless receiving and transmitting unit 5 is connected with the MCU module 2 through a serial port line, and the wireless receiving and transmitting unit 5 performs wireless interaction with a computer to realize data and instruction transmission. The utility model also comprises a network port unit which is in communication connection with the MCU module 2, and the network port unit provides wired connection communication, so that a user can conveniently use the network port unit when meeting space requirements or debugging.

The utility model further comprises a memory 10 which is in communication connection with the MCU module 2, wherein the memory is an electrified erasable programmable read-only memory with the model of CAT24C32YI-GT3 and is used for storing the calibration coefficient of the self-calibration module, so that the data can be prevented from being lost after power failure.

The change-over switch, the selection relay, the calibration switch and the detection switch are all relays with the model of AGQ200A4H, and the change-over switch, the selection relay, the calibration switch and the coil control end of the detection switch are all connected with an expansion IO port of the IO expander 6.

The working principle of the utility model is as follows:

when the 96 power supply channels are taken as an example for multi-channel current calibration, the 96 power supply channels are firstly divided into an odd group and an even group according to the sequence, the odd group and the even group respectively select a common node, and a cable with the cross section area of 4 square millimeters is used between the two nodes to pass through the current transformer 41. After the two short-circuited channels are set in a corresponding mode, such as the constant voltage mode set by the channel a, and the constant current mode set by the channel B, when current flows through the transformer, the current can be sensed by the current transformer 41 and a corresponding voltage signal can be generated. The voltage signal is sent to the attenuation module 7, after 2/3 attenuation is carried out by the attenuation module 7 by about 0.6667 times, the voltage data is read by the acquisition module 3 through the switching selection circuit, and finally the induced current is obtained through conversion, so that the test data is obtained.

Also taking 96 power channels as an example, the multi-channel voltage calibration is performed. According to the actual condition of 96-way power supply, two 12KW AC-DC power supplies are adopted for supplying power, and the 96-way power supplies are divided into three groups based on grouping management and in order to avoid the abnormality caused by different reference grounds. The three groups of voltages are respectively connected to the two groups of primary selection relays through wiring and a network, the output ends of the two groups of primary selection relays are connected to the two input ends of the secondary selection relay, the secondary selection relay is connected with the attenuation module 7, and one group of voltages is selected to be conducted and then attenuated through the attenuation module 7. And finally, the acquisition module 3 reads the voltage data, and the final voltage data is obtained through conversion.

During the conventional measurement, the data is fed back to the upper computer through the wireless communication module 5.

In order to ensure the measurement accuracy of the multi-channel wireless test calibration device, the multi-channel wireless test calibration device needs to be self-calibrated after being used for a certain time, and the multi-channel wireless test calibration device is connected to a voltage gear interface of a desk-top multimeter 34461A through an external interface 8 cable, and the calibrated calibration coefficients are stored in the memory 10 after being calibrated. The DAC module 9 receives the instruction of the MCU module 2, outputs a specific voltage to an external desk-top multimeter and the acquisition module 3, the external desk-top multimeter communicates with an upper computer through a data line to feed back a detection result, the upper computer communicates with the wireless communication module 5 through a wireless network, and further feeds back a calibration parameter value to the MCU module 2, and the MCU module 2 transfers the calibration coefficient to the memory 10, and retrieves the calibration coefficient to perform result correction when performing measurement.

While the embodiments of this utility model have been described in terms of practical aspects, they are not to be construed as limiting the meaning of this utility model, and modifications to the embodiments and combinations with other aspects thereof will be apparent to those skilled in the art from this description.

Claims (7)

1. The utility model provides a multichannel wireless test calibrating device, it includes power module (1), MCU module (2) and collection module (3), its characterized in that: it still includes measurement interface unit (4) and wireless communication module (5), collection module (3) with wireless communication module (5) all with MCU module (2) electrical signal connection, power module (1) power supply, wireless communication module (5) communicate with outside host computer, measurement interface unit (4) including with the public node complex current transformer (41) of product under test and multichannel switch on select module (42), multichannel switch on select module (42) with the input correspond and be connected with a plurality of products under test, current transformer (41) with the output of multichannel switch on select module (42) pass through change over switch with the input of collection module (3) is connected.

2. A multi-channel wireless test calibration device according to claim 1, wherein: the multichannel conduction selection module (42) comprises a plurality of selection relays, the MCU module (2) is connected with the plurality of selection relays and the control end of the change-over switch through the IO expander (6), and the selection relays are switched to enable a product to be detected, which is connected with the corresponding input end, to be conducted with a group of input ends of the change-over switch.

3. A multi-channel wireless test calibration device according to claim 1, wherein: and attenuation modules (7) are arranged between the current transformer (41) and the multichannel conduction selection module (42) and the corresponding input ends of the change-over switch.

4. A multi-channel wireless test calibration device according to claim 1, wherein: the power supply module (1) comprises a charging power supply.

5. A multi-channel wireless test calibration device according to claim 1, wherein: the self-calibration device comprises a self-calibration module, wherein the self-calibration module comprises an external interface (8) and a DAC module (9) connected with the MCU module (2), the output end of the DAC module (9) is connected with the input end of the acquisition module (3) through a calibration switch, and the external interface (8) is connected to the change-over switch and the output end of the calibration switch through a detection switch.

6. A multi-channel wireless test calibration device according to claim 1, wherein: the wireless communication module (5) comprises a wireless transceiver unit with the model number of YL-500 IL.

7. The multi-channel wireless test calibration device of claim 5, wherein: the device also comprises a memory (10) which is in communication connection with the MCU module (2), wherein the memory (10) stores calibration parameters of the self-calibration module.