Method and device for stably controlling pressing force of mainboard test CPU (Central Processing Unit)

Abstract

The invention relates to the field of automatic jigs, in particular to a stability control method and device for the pressing force of a mainboard test CPU, and the method comprises the steps: calculating a k value of a first pressure sensor through the combination of a pressure value detected by a second pressure sensor and the voltage output of the first pressure sensor, and calibrating the first pressure sensor; then the duty ratio of the pressing pulse section is calculated according to the pressure value detected by the first pressure sensor, and the duty ratio of the pressing pulse section is adjusted in real time; pI adjustment is carried out on the target travel in the test process; the stability control device comprises a jig supporting plate on which a mainboard to be tested is arranged; a water-cooling heat dissipation block is arranged at the lower end of the push rod, a CPU is arranged below the water-cooling heat dissipation block, and a first pressure sensor is arranged between the push rod and the water-cooling heat dissipation block. According to the invention, the pressing force of the CPU can be stably controlled, the test time is reduced, the cost is saved, the model selection requirement on the push rod is reduced, and the installation precision requirement of the push rod is reduced.

Description

technical field [0001] The invention relates to the field of automated fixtures, in particular to a method and a device for stabilizing the downforce pressure of a motherboard testing CPU. Background technique [0002] The CPU is one of the core components of the motherboard, which is particularly important for the performance of the motherboard. The motherboard has a card slot for installing the CPU. After the motherboard is fabricated, before mounting the CPU, it is necessary to perform performance testing on the motherboard card slot to avoid the motherboard after mounting the CPU. Poor performance leads to rework. The usual practice is to set a base on the automation fixture, place the motherboard in the base, the motherboard has a CPU card slot, and the CPU card slot has a probe that contacts the solder joints at the bottom of the CPU; a push rod is set above the base, and placed below the push rod CPU, use the push rod to press down the CPU with a certain force to pre...

AI Technical Summary

Problems solved by technology

The CPU plug-in mechanism uses a pressure sensor to measure the pressure of the CPU, and uses a displacement sensor to measure the pressing stroke. However, due to the influence of factors such as the measurement error of the displacement sensor and the response delay, as well as the measurement error of the pressure sensor, the downward force on the CPU is easily exceeded. The CPU is damaged due to the range of the CPU

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