Overcharge-free output line compensation circuit
A compensation circuit and output line technology, applied in the output power conversion device, the conversion of DC power input to DC power output, electrical components, etc. Effect of output compensation function
Active Publication Date: 2021-05-07
SUZHOU LII SEMICON CO LTD
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Problems solved by technology
Since the output voltage of the power supply is low during the start-up process, the power supply chip will misjudge the output overload at this time, and the existence of output line compensation will make the output voltage rise rapidly until the output voltage is greater than the designed output voltage value, resulting in the output of the power supply being overcharged. The situation is also not conducive to the stable operation of the load
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[0025] 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.
[0026] See figure 1 , the output line compensation circuit without overcharge in Embodiment 1 of the present invention can be applied to switching power supply circuits, such as voltage drop power supply circuits and flyback switching power supplies. In this embodiment, the output without overcharge The line compensation circuit is applied to a voltage-drop power supply circuit, which includes a first capacitor C1, a control chip, a second capacitor C2 connected to the control chip, a third capacitor C3, a first inductor L1, a first two Diode D1, second diode D2, and load. Among them, the control chip includes an output line compensation circuit without overcharge, a hi...
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The invention relates to an overcharge-free output line compensation circuit, which is used for accessing an initialization signal and outputting a first voltage feedback signal, and the first voltage feedback signal is input to other modules in a power supply control chip so as to adjust the power supply to output an output voltage conforming to a load. The overcharge-free output line compensation circuit comprises a line compensation control module, a first operational amplifier module, a voltage division module and a second operational amplifier module which are connected in sequence, wherein the line compensation control module controls the pull-down current of the first operational amplifier module, the voltage division module is used for dividing the output feedback voltage of the power supply control chip and then sending the divided output feedback voltage to the second operational amplifier module, the second operational amplifier module is further connected with a reference voltage signal at the same time, and the second operational amplifier module outputs a first voltage feedback signal according to a voltage division signal and the reference voltage signal.
Description
technical field [0001] The invention relates to an output line compensation circuit without overcharging. Background technique [0002] The widespread use and increasing development of portable electronic products has made the power supply industry market flourish. At the same time, the market has increasingly stringent requirements for power supply products. The feedback circuit in the switching power supply generally only performs voltage sampling on the output terminal of the power supply itself, and feeds back to the control circuit to adjust relevant control parameters in real time to keep the output terminal voltage stable. However, when the distance between the power supply and the load is long, the length, thickness, and material of the output line will cause differences in the resistance of the output line, resulting in different voltage drops on the output line under different loads, and ultimately affect the output. The accuracy of the voltage makes it unable to...
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IPC IPC(8): H02M3/157
CPCH02M3/157
Inventor 林新春张杰朱敏
Owner SUZHOU LII SEMICON CO LTD