Power circuit with compensation function

Abstract

The invention relates to the technical field of power circuits, in particular to a power circuit with a compensation function. The power circuit comprises a power supply, a power supply controlling chip, a peripheral circuit for the power supply controlling chip and an internal resistance compensation circuit. The output current of the power circuit with the compensation function are introduced into the peripheral circuit of the power supply controlling chip by the internal resistance compensation circuit, and the output voltage of the power circuit with the compensation function remains the same due to the internal compensation circuit regardless of the change of loads. According to the power circuit with the compensation function, by adding the simple internal resistance compensation circuit additionally on the basis of the original power circuit, the power circuit with the compensation function outputs a constant voltage, the theory, achieving way, and integrated circuit structure are simple, and not only is the cost low but also the reliability is high.

Description

technical field [0001] The invention relates to the technical field of power supply circuits, in particular to a power supply circuit with a compensation function. Background technique [0002] All electronic products are inseparable from power supply circuits. Some products are power supply products themselves, such as adapters and chargers, but not all power supplies are ideal power supplies. [0003] Such as figure 1 As shown, a common power supply circuit includes an ideal power supply V1 and an internal resistance R1, I is the total output current, the output voltage is the voltage on the load R2 Vout=V1-R1*I, or Vout=V1-R1*V1 / (R1 +R2), it can be seen that when the output current increases, the voltage drop across R1 will increase, and the output voltage Vout will decrease. This phenomenon is especially true in transformer-isolated open-loop control power supplies without output voltage feedback Obviously, since there is no feedback loop, the output performance is com...

AI Technical Summary

Problems solved by technology

[0005] There are many ways to keep the output voltage constant in the current power supply circuit, such as adding a voltage regulator circuit or adding a negative resistance power control circuit, but these circuits generally have a complicated structure, and a lot of additional power control circuits are added, which not only makes the product stable. The cost is greatly increased, and the reliability of the product is reduced

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