CN210090613U

CN210090613U - Integrated circuit multi-gear current detection device

Info

Publication number: CN210090613U
Application number: CN201920404496.7U
Authority: CN
Inventors: 高源�; 刘一清; 毛雨阳; 周家辉
Original assignee: East China Normal University
Current assignee: East China Normal University
Priority date: 2019-03-28
Filing date: 2019-03-28
Publication date: 2020-02-18
Anticipated expiration: 2029-03-28

Abstract

The utility model discloses an integrated circuit multi-gear current detection device, which is characterized in that the device consists of a singlechip, a current detection module, a relay module and an LCD touch display module, two ends of the integrated circuit to be detected are connected with two pins of the current detection module, the integrated circuit is detected by different currents, and the relay module and the LCD touch display module are respectively connected with stm32 of the singlechip; and the current detection module is respectively connected with the relay module and one path of ADC of stm32 of the single chip microcomputer. Compared with the prior art, the utility model have and carry out different mode selections according to the demand, both can fix the range measurement, also can open the real-time adjustment range of automatic mode and carry out the measurement that precision is highest, especially to the unable circumstances that satisfies of two ranges, only need increase relay and resistance, can realize the multi-gear and adjust, have stronger practical value in integrated circuit's current detection.

Description

Integrated circuit multi-gear current detection device

Technical Field

The utility model belongs to the technical field of integrated circuit and current detection examination technique and specifically relates to a switch over many gears current detection device through control relay break-make.

Background

In the design and maintenance of integrated circuits, current measurement is often required, and the current measurement methods are commonly used, namely direct measurement and indirect measurement. The direct measurement is to connect a sampling resistor in the current detection system to the integrated circuit to be detected in series to directly obtain the current amount; indirect measurement is to detect the magnetic field around the ic to be tested using the zero flux principle and convert it into a current magnitude.

At present, the series-connected precision resistor is in direct proportion to the detectable current range and in inverse proportion to the current detection precision during direct measurement, and the detection current range and the current detection precision can not be changed generally on the premise of not replacing the series-connected resistor and the current detection chip.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the not enough and a many gears of integrated circuit current detection device that provide to prior art, the break-make that adopts the relay carries out many gears and switches, not changing current detection chip and string resistance, can change current detection scope and current detection precision, realize measuring current and the full-automatic of many gears adjustable, it is quick to measure, accurate, effectively reduce cost of labor and testing error, accessible button realization system resets, and convenient operation, safety have stronger practical value in integrated circuit's current detection.

The purpose of the utility model is realized like this: the integrated circuit multi-gear current detection device is characterized by comprising a single chip microcomputer, a current detection module, a relay module and an LCD touch display module, wherein two ends of an integrated circuit to be detected are connected with two pins of the current detection module, the integrated circuit to be detected is detected under different current gears, and the relay module and the LCD touch display module are respectively connected with stm32 of the single chip microcomputer; and the current detection module is respectively connected with the relay module and one path of ADC of stm32 of the single chip microcomputer.

The detection under different current gears is two working modes of selecting a current gear or not selecting the current gear, and the working mode of selecting the current gear is current measurement with a fixed range; the working mode of the non-selection current gear is automatic gear shifting measurement of which the range is adjusted in real time according to the measurement result, namely, the current measurement is automatically switched to a small range when the current is too small, and the current measurement is automatically switched to a large range when the current is too large.

The single chip microcomputer is an STM32f767 type single chip microcomputer.

Compared with the prior art, the utility model when having change current detection scope and current detection precision, need not to change and bunch into resistance or increase the current detection chip, and can carry out different mode selection according to the actual demand, both can fix the range measurement, also can open automatic mode and adjust the range in real time and carry out the measurement that precision is highest, especially to the unable circumstances that satisfies of two ranges, only need increase relay and resistance, can realize many gears and adjust, it is quick to measure, it is accurate, effectively reduce cost of labor and test error, accessible button realization system resets, it is convenient, safety, have stronger practical value in integrated circuit's current detection.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the present invention;

FIG. 3 is an equivalent circuit diagram of a small-range current detection chip;

FIG. 4 is an equivalent circuit diagram of a wide-range current detection chip;

fig. 5 is a relay circuit diagram.

Detailed Description

Referring to the attached drawing 1, the utility model is composed of a single chip microcomputer 1, a current detection module 2, a relay module 3 and an LCD touch display module 4, wherein the current detection module 2 is respectively connected with the relay module 3 and one way ADC of stm32 of the single chip microcomputer 1; the relay module 3 and the LCD touch display module 4 are respectively connected with stm32 of the singlechip 1; the single chip microcomputer 1 adopts an STM32f767 type single chip microcomputer.

The present invention will be further described in detail below by taking the two-stage switching mode test LMP860X type current detection chip as an example.

Example 1

Referring to fig. 2, two ends of the integrated circuit 5 to be detected are connected to pins 1 and 8 of the current detection module 2, and current detection is performed in two working modes respectively.

The first working mode is as follows: the current is measured after the gear is selected, the gear of the measured current is selected through the LCD touch display module 4, the on-off of the relay module 3 is controlled after the gear is processed by the single chip microcomputer 1, therefore, the gear selection of the current detection chip measurement range is achieved, and meanwhile, the measurement result is displayed through a screen of the LCD touch display module 4.

And a second working mode: the current is directly measured without selecting gears, and self-adjusting measurement current is selected through the LCD touch display module 4, namely, the current is automatically switched to a small range when the current is too small, and the current is automatically switched to a large range when the current is too large. The current detection module 2 firstly adopts wide-range measurement, the test result is processed in real time by the singlechip 1, and when the small-range test can be met, the singlechip 1 controls the relay module 3 to be communicated and switches to a small-range mode; when the current is increased to a value which does not meet the small-range test, the single chip microcomputer 1 controls the relay module 3 to be switched off and switched to a large-range mode, and meanwhile, the measurement result is displayed through a screen of the LCD touch display module 4.

Referring to fig. 3, when measuring current, two ends A, B of the current to be detected in the integrated circuit 5 to be detected are connected to the circuit, and a small range is selected to start measurement through the LCD touch display module 4, and at this time, the current detection module (2) selects the current detection chip LMP860X, and capacitors are formed between three and four pins of the current detection chip and the ground, so that the current can be amplified by 20 times inside the LMP8601 current detection chip; LMP8602 can be magnified by a factor of 50; LMP8603 may be magnified 100 times. The resistance value of a precision resistor connected in series with an LMP8603 chip is 1 omega, the measurable current range is 0-16.5 mA, and the precision is 0.129mA due to the fact that an ADC of the STM32 is 0-127.

Referring to fig. 4, when measuring current, the two ends A, B of the current to be detected in the integrated circuit 5 to be detected are connected to a circuit, and the LCD touch display module 4 selects a large range to start measurement, at this time, the relay is turned on, the three and four pins of the current detection chip LMP860X are capacitors connected in parallel with the ground, and the gain is reduced by the following formulas (a) to (c):

when one end of the relay is connected with a resistor R₂When the voltage is 10k, the LMP8601 current detection chip can amplify the current by 1.82 times; LMP8602 can be amplified by 4.55 times; LMP8603 is magnified 9.09 times. The resistance value of a precision resistor connected in series with an LMP8603 chip is 1 omega, the resistance value of R2 is 10k, the current measurement range is 0-165 mA, and the precision is 1.29mA due to the fact that the STM32ADC is 0-127.

Referring to fig. 5, the utility model discloses a relay rather than analog switch control break-make aims at adopting pure mechanical system to carry out the disconnection of circuit, effectively prevents signal crosstalk. The utility model discloses integrated circuit based on STM32f767 realizes measuring current and the adjustable current detection of many gears, selects through LCD touch-sensitive screen control, has realized the current detection and has measured the regulation of gear to the current detection chip, passes through LCD screen display with the testing result simultaneously, not only realizes measuring the function of integrated circuit different scope electric currents to can set up the self-propelled switching gear according to the electric current size, make the measuring result more accurate, and can realize full automatic operation.

The present invention is further described above, but not limited to this patent, and all equivalent implementations of the present invention are intended to be encompassed by the scope of the claims of this patent.

Claims

1. The integrated circuit multi-gear current detection device is characterized by comprising a single chip microcomputer, a current detection module, a relay module and an LCD touch display module, wherein two ends of an integrated circuit to be detected are connected with two pins of the current detection module to detect under different current gears, and the relay module and the LCD touch display module are respectively connected with the single chip microcomputer; and the current detection module is respectively connected with the relay module and the ADC in one path of the singlechip.

2. The integrated circuit multi-gear current detection device according to claim 1, wherein the detection in different current gears is two operation modes of selecting a current gear or not selecting a current gear, and the operation mode of selecting a current gear is a fixed-range current measurement; the working mode of the non-selection current gear is automatic gear shifting measurement of which the range is adjusted in real time according to the measurement result, namely, the current measurement is automatically switched to a small range when the current is too small, and the current measurement is automatically switched to a large range when the current is too large.

3. The integrated circuit multi-gear current detection device according to claim 1, wherein the single chip microcomputer is an STM32f767 type single chip microcomputer.