Electronic correction chip for circuit parameters of circuit board

Abstract

The invention provides an electronic correction chip for circuit parameters of a circuit board. Parameters of a main circuit are adjusted through the correction chip, thereby achieving the correctioneffect on the performance index; pre-connected or pre-disconnected components and other components of the main circuit are welded to the printed circuit board together, and no extra welding or dismounting work is needed, and the correction work can be achieved only by applying voltage excitation in the testing process, thereby achieving the full automation easily, improving the production efficiency, and reducing the cost.

Description

technical field [0001] The invention belongs to the technical field of printed circuit board maintenance, in particular to an electronic correction chip for circuit parameters of a circuit board. Background technique [0002] In the design of electronic circuits, due to the processing principle of electronic devices or the physical mechanism of the device itself, the parameter accuracy of electronic devices is limited and cannot be fixed. For circuit designers, it is often required that the device The more accurate the parameters, the better. In this way, the performance of the designed circuit is more in line with the preset goals, and it can ensure good consistency and high yield in the production process. [0003] For example, some switching power supplies that use inductance and capacitor resonance to realize zero-voltage switching. If the power tube is turned on or off when the resonance is just at a low voltage, the efficiency is the highest at this time. Due to the sm...

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Problems solved by technology

Unfortunately, due to the deviation of capacitance and inductance, the resonance period is caused, which leads to the out-of-synchronization of the lowest point of the resonance voltage with the power tube, and a phase shift occurs, which not only does not increase the efficiency of the switching power supply, but may even cause the efficiency to deteriorate. The original work The principle fails due to the parameter deviation of the original device

For another example, the purpose of the regulated switching power supply is to obtain a more accurate output voltage. However, due to the deviation of the reference voltage and the deviation of the sampling resistor, especially the popular primary-side feedback flyback power supply in recent years is also affected by the transformer turns ratio and The influence of the output diode parameters makes the output voltage accuracy of the power supply out of the specification range.

[0004] Like this kind of circuit products manufactured on printed circuit boards, due to component deviations, the products do not meet the specifications everywhere. The traditional method to solve such problems: one is to relax the product index requirements, such as the above-mentioned principle The side feedback flyback switching power supply generally achieves ±5% accuracy, so the precision power supply can only meet part of the application requirements; the other is to repair the products that do not meet the indicators, replace or increase or decrease the device to correct the device parameters. To meet the indicators, this method requires a lot of man-hours and costs, because after the printed circuit board is pasted with the device, it is difficult to remove or increase or decrease the device in the densely packed devices, and only It can be operated manually, and the repair yield rate is also low

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