CN213482327U

CN213482327U - Current test circuit

Info

Publication number: CN213482327U
Application number: CN202022634994.6U
Authority: CN
Inventors: 冯俊杰
Original assignee: Hangzhou Aixin Intelligent Technology Co ltd
Current assignee: Hangzhou Aixin Intelligent Technology Co ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-06-18
Anticipated expiration: 2030-11-13

Abstract

The application relates to a current test circuit, including: the current acquisition module is coupled with a tested product and used for acquiring a working current signal or a standby current signal of the tested product; the data conversion module is used for carrying out data calculation and conversion on the collected working current signal and the collected standby current signal; the conference conversion module is used for converting the converted data into a communication protocol; and the communication module is used for carrying out data interaction on the data after the communication protocol conversion and the upper computer. The current testing circuit is a multipurpose simple current testing tool which combines a communication module and a data conversion module, can control a tested product, can detect current and returns information to an upper computer for recording in real time.

Description

Current test circuit

Technical Field

The application relates to the technical field of testing, in particular to a current testing circuit.

Background

At present, most current test boards are used in the use scenes of alternating current or large voltage and current, and the principle basically adopts a current induction mutual inductance type Hall current sensor as a main part. For consumer-grade electronic products with low power consumption, the use scene of such large voltage and large current can not appear under the normal working condition.

For the above electronic products, the current detection is not well applicable, and in the process of product development, power consumption is also one of the most important parameters, which determines the product use period and the stability of product functions. Although there is corresponding detection instrument to small-power consumption product in the market, the precision is far away not enough to show the current value basically, can not be fine carry out storage analysis and calculation with data.

Therefore, a current detection tool which has high precision, can be operated, is brief and convenient to use in the test and can communicate or calculate data with an upper computer is needed. The development and the test of the product by the tool can simplify the process and realize intelligent information, thereby improving the production efficiency.

Disclosure of Invention

In view of the above, it is necessary to provide a current test circuit for solving the above technical problems.

A current test circuit comprising:

the current acquisition module is coupled with a tested product and used for acquiring a working current signal or a standby current signal of the tested product;

the data conversion module is used for carrying out data calculation and conversion on the collected working current signal and the collected standby current signal;

the protocol conversion module is used for converting the converted data into a communication protocol;

and the communication module is used for carrying out data interaction on the data after the communication protocol conversion and the upper computer.

As an embodiment, the current collection module includes:

the working current acquisition unit is used for acquiring a working current signal;

the standby current acquisition unit is used for acquiring standby current signals;

and the control unit is used for controlling the on and off of the working current acquisition unit and the standby current acquisition unit.

As an implementation manner, the current collection module further includes a voltage division unit, and the voltage division unit is configured to control a sampling voltage value of the current collection module within a range of 0V to 2.5V.

As an implementation manner, the test device further includes a data interface module, where the data interface module is coupled to the current collection module and the tested product, and is used for supplying power to the current test circuit and communicating the current test circuit and the tested product.

In one embodiment, the data interface module is a 3pin interface.

As an implementation manner, the testing device further includes a communication interface module, coupled to the protocol conversion module and the tested product, for communication interaction between the current testing circuit and the tested product.

In one embodiment, the communication interface module is configured as one or more of an MPSS interface, a UART interface, and an SPI interface.

The current testing circuit is a multipurpose simple current testing tool which combines a communication module and a data conversion module, can control a tested product, can detect current and returns information to an upper computer for recording in real time;

sampling a working current signal and a standby current signal in a low-end detection mode, and ensuring the current sampling precision through a control unit and a voltage division unit;

the system has the advantages that configurable ports such as MPSS (Multi-purpose system) interfaces, UART (universal asynchronous receiver/transmitter) interfaces and SPI (Serial peripheral interface) interfaces are provided, so that debugging control and information transmission can be carried out on a tested product in real time through an upper computer, and in order to fully utilize the characteristics, a test tool can be manufactured and connected for use.

Drawings

FIG. 1 is a block diagram of a current test circuit according to one embodiment;

fig. 2 is a circuit diagram of a current collection module in one embodiment.

Reference numerals: 100. a current collection module; 101. a working current collecting unit; 102. a standby current collection unit; 103. a control unit; 104. a voltage dividing unit; 200. a data conversion module; 300. a protocol conversion module; 400. a communication module; 500. a data interface module; 600. and a communication interface module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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 present application and are not intended to limit the present application.

In one embodiment, as shown in fig. 1, a current testing circuit is provided, which includes a current collecting module 100, a data converting module 200, a protocol converting module 300, and a communication module 400; the current acquisition module 100 is coupled to a product to be tested and is configured to acquire a working current signal or a standby current signal of the product to be tested; the data conversion module 200 is used for performing data calculation and conversion on the acquired working current signal and standby current signal; the protocol conversion module 300 is configured to convert the converted data into a communication protocol; and the communication module 400 is used for performing data interaction on the data after the communication protocol conversion and the upper computer.

As shown in fig. 2, the current collecting module 100 includes a working current collecting unit 101, a standby current collecting unit 102, and a control unit 103, where the control unit 103 is configured to control the on and off of the working current collecting unit 101 and the standby current collecting unit 102 to collect a working current signal and a standby current signal. The working current collection unit 101 is a resistor R202 of 0.2 Ω, and the standby current collection unit 102 is a resistor R200 of 200k Ω. The control unit 103 is composed of a triode Q201 and a MOS transistor Q200.

The current collection module 100 further includes a voltage division unit 104, in addition to the above units, the voltage division unit 104 is used for controlling the sampling voltage value of the current collection module 100 within the range of 0V-2.5V, and the voltage division unit 104 includes a resistor R231, a resistor R205, a resistor R230, and a resistor R1.

When the working current starts to be detected, the upper computer sends a control command, the control unit 103 of the detected product is started after receiving the command, and after the control unit 103 in the current acquisition module 100 receives the sent control command, the transmitter of the triode Q201 is enabled to be biased in the forward direction, the collector of the triode Q201 is enabled to be biased in the reverse direction, and the triode Q201 enters a saturated conduction state. Meanwhile, the grid electrode of the MOS tube Q200 is connected with the collector electrode of the triode Q201, and the grid electrode potential Vg of the MOS tube Q200 at the moment is smaller than the source electrode potential Vs, namely Vgs < 0. The MOS transistor Q200 is turned on. The input voltage passes through a product power interface and a high-precision sampling resistor R202, and is differentially input to the data conversion module 200 and the protocol conversion module 300 after sampling. After calculation such as conversion, filtering and the like of the data conversion module 200 and the protocol conversion module 300, the result is transmitted to the upper computer through the communication unit, so that the value of the working current is known.

When a quiescent operating current is detected. The upper computer sends a shutdown control command, and the tested product control unit 103 closes after receiving the command. After the control unit 103 in the current collection module 100 receives the sent control command, no current passes through the base of the triode Q201, the emitter is reversely biased, the collector is reversely biased, the triode Q201 is cut off and turned off, the Vgs voltage of the MOS transistor Q200 is not less than 0, and the MOS transistor Q200 is turned off. The input power passes through the high-precision sampling resistor R200, and the voltage of the 2 end of the sampling resistor R200 is subjected to voltage division and sampling, so that the voltage value input to the data conversion module 200 is in the working range. After the calculation such as filtering and conversion of the data conversion module 200 and the protocol conversion module 300, the result is transmitted to the upper computer through the communication unit, so that the current value of the tested product in a static state can be obtained.

The current testing circuit further includes a data interface module 500, wherein the data interface module 500 is coupled to the current collecting module 100 and the tested product, and is used for supplying power to the current testing circuit and communicating the current testing circuit with the tested product. In this embodiment, the data interface module 500 is a 3pin interface, which is an enable interface, a ground interface, and a power interface. In addition, the data interface module 500 reserves test points, and when different products are tested, the test points can be led out and then directly connected with the product to be tested, so that different products with different interfaces of the product to be tested can be tested, and the test interfaces do not need to be replaced.

In addition to the above modules, the current testing circuit further includes a communication interface module 600, wherein the communication interface module 600 is coupled to the protocol conversion module 300 and the tested product, and is used for communication interaction between the current testing circuit and the tested product. The communication interface module 600 is configured as one or more of an MPSS interface, a UART interface, and an SPI interface.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The utility model discloses a current test circuit adopts communication module 400 and data conversion module 200 to combine, and is controllable to the product of being surveyed promptly, can carry out current detection again, and the information returns the simple and easy current testing tool of multipurpose of host computer record in real time;

sampling a working current signal and a standby current signal in a low-end detection mode, and ensuring the current sampling precision through a control unit 103 and a voltage division unit 104;

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A current test circuit, comprising:

2. The current test circuit of claim 1, wherein the current collection module comprises:

3. The current testing circuit of claim 2, wherein the current collection module further comprises a voltage division unit, and the voltage division unit is configured to control the sampling voltage value of the current collection module to be within a range of 0V to 2.5V.

4. The current testing circuit of claim 1, further comprising a data interface module, coupled to the current collection module and the product under test, for powering the current testing circuit and communicating the current testing circuit with the product under test.

5. The current test circuit of claim 4, wherein the data interface module is a 3pin interface.

6. The circuit for testing current of claim 1, further comprising a communication interface module coupled to the protocol conversion module and the product under test for communication interaction between the circuit for testing current and the product under test.

7. The current test circuit of claim 6, wherein the communication interface module is configured as one or more of an MPSS interface, a UART interface, and an SPI interface.