Automatic power adjusting system of power adapter

Abstract

The invention discloses an automatic power adjusting system of a power adapter. The automatic power adjusting system comprises a bus voltage acquisition module, a secondary line voltage acquisition module, a comparison trigger module, an oscillation control module and an operational amplifier filtering module, wherein the bus voltage acquisition module acquires a voltage value input by the power adapter, the secondary line voltage acquisition module acquires a voltage value output by the power adapter, the comparison trigger module compares output signals of the bus voltage acquisition module and the secondary line voltage acquisition module, when a difference value of output voltages of the bus voltage acquisition module and the secondary line voltage acquisition module is too large, an emitter voltage of a triode Q3 is at a low level relative to a static voltage, the emitter voltage is divided by a resistor R17 and then is directly input into a power controller at the low level, the power controller directly pulls up an output voltage of the power adapter, and meanwhile, a collector electrode of the triode Q3 is directly input into an operational amplifier filtering module after in-phase amplification by an operational amplifier AR6 and is directly input into a power compensation port of the power adapter. The micro-compensation effect on the output voltage of the power adapter is achieved.

Description

technical field [0001] The invention relates to the technical field of power adapters, in particular to an automatic power adjustment system for power adapters. Background technique [0002] The power adapter is a power supply conversion device for small portable electronic devices and electronic appliances. The output power of the power adapter is determined by the output voltage and output current, but in fact, once the voltage is determined during the adjustment process of the power adapter, the output The current will also be determined accordingly and controlled by the main circuit board in the power adapter. However, during the power adjustment process of the power adapter, since the bus voltage is a standard voltage, and the bus voltage is charged for the device to be charged after the power is converted by the power adapter, the power adapter It will consume part of the voltage itself, especially the power adapter that has been used for a long time, which will cause ...

AI Technical Summary

Problems solved by technology

[0002] The power adapter is a power supply conversion device for small portable electronic devices and electronic appliances. The output power of the power adapter is determined by the output voltage and output current, but in fact, once the voltage is determined during the adjustment process of the power adapter, the output The current will also be determined accordingly and controlled by the main circuit board in the power adapter. However, during the power adjustment process of the power adapter, since the bus voltage is a standard voltage, and the bus voltage is charged for the device to be charged after the power is converted by the power adapter, the power adapter It will consume part of the voltage itself, especially the power adapter that has been used for a long time, which will cause the voltage to drop when the power adapter passes through the auxiliary line to the device to be charged. Reduced, long-term low-voltage charging causes the virtual power state of the energy storage power supply of the equipment to be charged

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