dc‑dc device welding detection device
A welding detection and device technology, which is applied in the field of DC-DC device welding detection devices, can solve the problem that the welding state of the DC-DC device auxiliary circuit cannot be really detected, the DC-DC device and the auxiliary circuit are soldered, and the artificial electrical property cannot be performed. inspection, etc.
Active Publication Date: 2017-05-31
BOE TECH GRP CO LTD +1
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Problems solved by technology
[0003] However, due to the large number of auxiliary circuits of the DC-DC drive circuit and the dense distribution, the limitation of the wiring space on the FPC makes it difficult to reserve measurement points on the FPC, and the QFN device Pitch (pitch) is small, and the domestic FPC SMT (Surface Mounted Technology, surface Mounting technology) manufacturing process and process constraints and other factors, resulting in defects such as virtual welding and short circuit of DC-DC devices and auxiliary circuits
The traditional detection method is only through visual inspection or AOI (Automatic Optic Inspection, automatic optical inspection) and detection of the impedance state of FPC input and output to determine the welding state to detect poor welding
However, the traditional electrical detection method only checks the input and output impedance status of the entire FPC when it is not powered on. In fact, it cannot really detect the welding status of the auxiliary circuit of the DC-DC device, especially for QFN devices, which have no leakage pins. Manual electrical inspection is also not possible
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[0033] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0034] figure 1 It is a schematic diagram of a DC-DC device welding detection device provided in an embodiment of the present invention, including:
[0035] The power module 100 is used to input a preset voltage to the DC-DC device 410 on the circuit board 400;
[0036] A frequency generating module 200, configured to input a preset clock frequency signal to the DC-DC device 410;
[0037] The voltage detection and judgment module 300 is configured to detect the welding quality of the DC-DC device 410 on the circuit board 400 according to the output voltage of the DC-DC device 410 .
[0038] Specifically, the voltage detection and judgment module can compare the output v...
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The present invention provides a DC-DC device welding detection device, the DC-DC device welding detection device includes: a power module, used to input a preset voltage to the DC-DC device on the circuit board; The DC-DC device inputs a preset clock frequency signal; the voltage detection and judgment module is used to detect the welding quality of the DC-DC device on the circuit board according to the output voltage of the DC-DC device. The DC-DC device welding detection device provided by the present invention uses a DC-DC device as a booster device. When a preset voltage and clock frequency signal are input to it, the DC-DC device can output a corresponding voltage. By comparing its output The size of the voltage and the reference voltage, so that it can be judged whether it is working normally, that is, the welding quality of the DC‑DC device can be detected when the circuit board is powered on, and then the defect can be detected.
Description
technical field [0001] The invention relates to the display field, in particular to a DC-DC device welding detection device. Background technique [0002] With the continuous improvement of display technology, the driving capability of the LCD (Liquid Crystal Display, liquid crystal display device) module drive circuit is increasingly required, and more and more FPC (Flexible Printed Circuit, flexible circuit board) will appear QFN (Quad Flat No-leadPackage, square flat no-lead package) DC-DC (direct current-direct current) device. [0003] However, due to the large number of auxiliary circuits of the DC-DC drive circuit and the dense distribution, the limitation of the wiring space on the FPC makes it difficult to reserve measurement points on the FPC, and the QFN device Pitch (pitch) is small, and the domestic FPC SMT (Surface Mounted Technology, surface Mounting technology) manufacturing process and process constraints and other factors, resulting in defects such as virt...
Claims
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IPC IPC(8): G01R31/02
CPCG01R31/40G01R31/71G01R31/2812G01R19/16571G01R31/10G01R31/08G01R31/00G01R31/11
Inventor 翟文凯范利涛赵天笑杨瑞峰
Owner BOE TECH GRP CO LTD