Signal generator testing device

Abstract

The utility model relates to the technical field of OLED (Organic Light Emitting Diode) panels, in particular to a signal generator testing device, which comprises a power supply module, a microcontroller, a signal measuring module and a multi-path signal module, the power supply module is respectively connected with the microcontroller, the signal measurement module and the multi-path signal module; the microcontroller is respectively connected with the signal measurement module and the multi-path signal module; and the signal measurement module is connected with the multi-path signal module. According to the utility model, the number of devices such as the relays, the multi-path analog switch chips and the AD chips can be selected according to the number of measurement signal channels, so that the measurement cost can be controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of OLED panel, specifically relates to a signal generator testing arrangement. BACKGROUND

[0002] In the OLED panel industry, it is usually required to detect whether the multi-channel Signal and Data signals of a signal generator (EEC-302T) are short-circuited or open-circuited. The existing methods are to directly use ready-made measuring tools for measurement, such as using a multimeter to measure between points, or to use a general module group to measure single-channel signal short circuits. However, using ready-made instruments on the market for measurement will increase production costs, and conventional open-short circuit detection instruments generally measure the open-short circuit conditions between adjacent lines of PINs of different PIN bit numbers at the same time. Such a measuring instrument can only be used for single-purpose measurement, and must be operated according to the original manufacturer's setting method, and cannot perform adaptive signal checking of multi-channel signals, and the measurement accuracy is not high, and other measuring instruments are similar. SUMMARY

[0003] In view of the above deficiencies in the prior art, the utility model provides a signal generator testing arrangement.

[0004] In order to achieve the above-mentioned utility model purposes, the utility model adopts the technical scheme that:

[0005] A signal generator testing arrangement, comprising a power supply module, a microcontroller, a signal measurement module and a multi-channel signal module; the power supply module is connected with the microcontroller, the signal measurement module and the multi-channel signal module respectively; the microcontroller is connected with the signal measurement module and the multi-channel signal module respectively; and the signal measurement module is connected with the multi-channel signal module.

[0006] Further, the power supply module comprises an AC-DC conversion chip, a 5V voltage stabilizing chip and a 3.3V voltage stabilizing chip; the input end of the AC-DC conversion chip is connected with an external power supply, the output end of the AC-DC conversion chip is connected with the input end of the 5V voltage stabilizing chip; the output end of the 5V voltage stabilizing chip is connected with a 5V power supply end and the input end of the 3.3V voltage stabilizing chip; and the output end of the 3.3V voltage stabilizing chip is connected with a 3.3V power supply end.

[0007] Further, the AC-DC conversion chip adopts an EH05-S12 power supply chip, the 5V voltage stabilizing chip adopts an LM7805 three-terminal voltage stabilizing chip, and the 3.3V voltage stabilizing chip adopts an 1117-3.3 three-terminal voltage stabilizing chip.

[0008] Further, the microcontroller adopts an STM32F103C8T6 chip.

[0009] Further, the signal measurement module adopts an AD5520JSTZ chip.

[0010] Further, the multi-channel signal module comprises a first analog switch chip, a second analog switch chip and a multiplexing chip; control ends of the first analog switch chip and the second analog switch chip are connected with a microcontroller; input signal ends of the first analog switch chip and the second analog switch chip are connected with external input signals; setting signal ends of the first analog switch chip and the second analog switch chip are connected with input ends of the multiplexing chip; and an output end of the multiplexing chip is connected with the microcontroller.

[0011] Further, the first analog switch chip adopts an ADG1636BRUZ chip, the second analog switch chip adopts an ADG1636BRUZ chip, and the multiplexing chip adopts a CD74HC238M chip.

[0012] The utility model has the following beneficial effects:

[0013] (1) the utility model discloses a design for EEC_302T signal inspection machine, can be very good into the EEC_302T signal inspection machine inside, as one of O / S check module use.

[0014] (2) the utility model discloses according to the extension of the existing EEC_302T signal inspection machine, similarly can use and similar structure's EEC_302B signal inspection machine, has higher applicability and expansibility.

[0015] (3) the utility model discloses according to the number of relay, multipath analog switch chip, AD chip and other devices of the measurement signal channel, realizes the controllable measurement cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a kind of signal generator test device structural schematic diagram;

[0017] Figure 2 It is power module principle schematic diagram;

[0018] Figure 3 It is microcontroller principle schematic diagram;

[0019] Figure 4 It is signal measurement module principle schematic diagram;

[0020] Figure 5 It is first analog switch chip principle schematic diagram;

[0021] Figure 6 It is second analog switch chip principle schematic diagram;

[0022] Figure 7 The schematic diagram of the multiplexing chip principle. DETAILED DESCRIPTION

[0023] The specific embodiments of the utility model are described below, so that the person skilled in the art can understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific embodiments, and for the person skilled in the ordinary skill in the art, as long as various changes are within the spirit and scope of the utility model defined and determined by the appended claims, these changes are obvious, and all the utility model creations using the concept of the utility model are within the scope of protection.

[0024] As Figure 1 The utility model discloses a signal generator testing arrangement, including power module, microcontroller, signal measurement module and multichannel signal module, power module is connected with microcontroller, signal measurement module and multichannel signal module respectively, microcontroller is connected with signal measurement module and multichannel signal module respectively, signal measurement module is connected with multichannel signal module.

[0025] In the embodiment, the power module includes an AC-DC conversion chip, a 5V voltage stabilizing chip and a 3.3V voltage stabilizing chip; an input end of the AC-DC conversion chip is connected with an external power supply, and an output end of the AC-DC conversion chip is connected with an input end of the 5V voltage stabilizing chip; an output end of the 5V voltage stabilizing chip is connected with a 5V power supply end and an input end of the 3.3V voltage stabilizing chip; and an output end of the 3.3V voltage stabilizing chip is connected with a 3.3V power supply end.

[0026] The AC-DC conversion chip is an EH05-S12 power supply chip, the 5V voltage stabilizing chip is an LM7805 three-terminal voltage stabilizing chip, and the 3.3V voltage stabilizing chip is an 1117-3.3 three-terminal voltage stabilizing chip.

[0027] As Figure 2 The power module is connected with AC220V, and the AC220V is converted into DC by the EH05-S12 power supply chip U11, then supplied to the LM7805 three-terminal voltage stabilizing chip U5, and finally the enable voltage 3.3V of the microcontroller is obtained through the 1117-3.3 three-terminal voltage stabilizing chip U18, the output voltage VO+ is filtered by the electrolytic capacitor C19 and the non-polarity tantalum capacitor C13, and the noise of the output voltage is fully filtered, and C14 and C20 are the same. The switch S1 is a switch for outputting 3.3V, and the LED1 is a 3.3V indicator lamp.

[0028] Characteristics of the EH05-S12:

[0029] Wide voltage input: 85-265VAC, with output short circuit and over-temperature protection functions.

[0030] Temperature characteristics: operating temperature, power derating, storage temperature, case temperature are -40℃ to +70℃, 3.75% / ℃, -40℃ to +105℃, +90℃ max respectively.

[0031] Power down time: 40ms / at V-in: 320Vdc.

[0032] Switching frequency: 60kHz.

[0033] Mean time between failures: (MTBF) >200,000h @25℃.

[0034] In this embodiment, the microcontroller uses an STM32F103C8T6 chip, as shown in Figure 3 The STM32F103C8T6 chip is a microcontroller chip launched by STMicroelectronics, which uses an ARM Cortex-M3 core architecture. It has rich peripheral resources, including multiple general-purpose I / O pins, serial communication interfaces, timers, analog-to-digital converters (ADC), SPI, I2C, etc., which can meet various application requirements. The chip also integrates flash memory and RAM for storing program code and data. It supports multiple communication protocols and buses such as CAN, USB, Ethernet, etc., which can easily communicate with other devices. The parameter specification is a 32-bit ARM Cortex-M3 core with a main frequency of up to 72MHz. The flash memory capacity is 64KB or 128KB. The RAM capacity is 20KB. It supports multiple peripheral interfaces such as GPIO, USART, SPI, I2C, ADC, etc. It supports multiple communication protocols and buses such as CAN, USB, Ethernet, etc. The operating voltage range is 2.0V to 3.6V.

[0035] The microcontroller sends control signals to the signal measurement module, which applies different levels of current to the specified PIN according to the control signals while measuring the voltage change after applying the current, and returns the measurement results to the microcontroller; and selects the signal channel to be tested through the control of the multi-channel signal module; finally, according to the measurement results of the signal measurement module and the AD data collected by the multi-channel signal module, the signal state is determined, i.e. whether the signal generator has short circuit and open circuit.

[0036] In this embodiment, the signal measurement module uses an AD5520JSTZ chip, as shown in Figure 4The AD5520JSTZ chip is a single-channel per pin parametric measurement unit (PPMU) for semiconductor automatic test equipment. The AD5520JSTZ chip is controlled by multiple digital inputs, including CS (chip select), STB (enable), FSEL (select voltage or current drive), and MSEL (select measurement parameter). Current range setting: The full-scale current range is set through the AM0, AM1, and AM2 pins, supporting different current ranges from ±4 µA to ±4 mA.

[0037] In the embodiment, the multi-channel signal module includes a first analog switch chip, a second analog switch chip, and a multiplexing chip; control ends of the first analog switch chip and the second analog switch chip are connected with a microcontroller; input signal ends of the first analog switch chip and the second analog switch chip are connected with external input signals; setting signal ends of the first analog switch chip and the second analog switch chip are connected with input ends of the multiplexing chip; and an output end of the multiplexing chip is connected with the microcontroller.

[0038] The first analog switch chip is an ADG1636BRUZ chip, as shown in Figure 5 The second analog switch chip is an ADG1636BRUZ chip, as shown in Figure 6 The multiplexing chip is a CD74HC238M chip, as shown in Figure 7 .

[0039] The multi-channel signal module selects a measurement signal in cooperation with the microcontroller. O_EN01 is used to select tests REN_01 and REN_02. This signal channel is sent by the microcontroller and then drives the NPN transistor Q6. When the emitter and collector of the NPN transistor Q6 are turned on, the relay K1 coil is powered, the input signal IN_01 and the setting signal SET_01 are turned on, and the data pin of the ADG1636BRUZ chip U23 is then powered. Then the microcontroller collects the AD data of the ADG1636BRUZ chip U23 through the multiplexing switch of the CD74HC238M chip U24, and then determines the output. Similarly, O_EN02 is used to select tests REN_03 and REN_04, and the signal measurement is extended in this way.

[0040] The utility model discloses a design for EEC_302T signal inspection machine, can be well integrated into the EEC_302T signal inspection machine inside, as one of O / S inspection module uses. The utility model discloses according to the extension of current EEC_302T signal inspection machine, similarly can use and similar structure's EEC_302B signal inspection machine, with higher applicability and expansibility;The utility model discloses according to the selection of the number of devices such as relay, multipath analog switch chip, AD chip etc. according to the number of measurement signal channels, realizes the controllable measurement cost.

[0041] The principle and implementation mode of the utility model are described in the specific embodiments, and the above embodiment is only used to help understand the method and core idea of the utility model; meanwhile, for the ordinary skilled in the art, according to the idea of the utility model, the specific implementation mode and application range will have changes, and the above, the content of the specification should not be understood as the limitation of the utility model.

[0042] The ordinary skilled in the art will realize that the embodiments described herein are to help the reader understand the principle of the utility model, and should be understood as the protection scope of the utility model is not limited to such special statements and embodiments. The ordinary skilled in the art can make various other specific modifications and combinations according to the technical inspiration of the utility model without departing from the essence of the utility model, and these modifications and combinations are still within the protection scope of the utility model.

Claims

1. A signal generator test apparatus, characterized by, The power supply module, the microcontroller, the signal measurement module and the multi-channel signal module are connected with each other.

2. A signal generator testing apparatus as claimed in claim 1, wherein, The power supply module comprises an AC-DC conversion chip, a 5V voltage stabilizing chip and a 3.3V voltage stabilizing chip.

3. A signal generator testing apparatus as claimed in claim 2, wherein, The AC-DC conversion chip is an EH05-S12 power supply chip, the 5V voltage stabilizing chip is an LM7805 three-terminal voltage stabilizing chip, and the 3.3V voltage stabilizing chip is an 1117-3.3 three-terminal voltage stabilizing chip.

4. The signal generator testing apparatus of claim 1, wherein, The microcontroller is an STM32F103C8T6 chip.

5. The signal generator testing apparatus of claim 1, wherein, The signal measurement module is an AD5520JSTZ chip.

6. The signal generator testing apparatus of claim 1, wherein, The multi-channel signal module comprises a first analog switch chip, a second analog switch chip and a multiplexing chip.

7. A signal generator testing apparatus as claimed in claim 6, wherein, The first analog switch chip is an ADG1636BRUZ chip, the second analog switch chip is also an ADG1636BRUZ chip, and the multiplexing chip is a CD74HC238M chip.

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