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Line loss compensation circuit

A line loss compensation and circuit technology, applied in the direction of electrical components, adjusting electrical variables, instruments, etc., can solve the problems of complex wiring, high cost, narrow application range, etc., to reduce complexity, reduce development costs, and solve output voltage accuracy Larger offset effects

Pending Publication Date: 2021-10-22
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used line loss compensation circuit widely adopts the circuit scheme of connecting two lines to the output terminal of the switching power supply to sample the voltage of the equipment. On the one hand, this scheme requires external wiring materials, which makes the cost high; and waste of cost
[0004] In addition, there is also a delay protection circuit built with analog devices, but it cannot be actively adjusted due to different line losses, and its use range is narrow

Method used

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Examples

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no. 1 example

[0030] figure 1 The line loss compensation circuit structure shown in the first embodiment of the present invention includes a line loss compensation circuit of the present embodiment comprises a sample amplifying circuit, a voltage dividing circuit, and an addition circuit.

[0031] The sampling amplifying circuit includes an op amp U1B, the resistor R1, and the adjustable resistor RP1, and the same phase input of the op amp U1B is used to input the sampling voltage V1, one end of the resistor R1, and the other end of the resistor R2 simultaneously connects the inversion of the U1B. One end of the end and resistor RP1, the output of the output terminal of the op amp U1B and the other end of the resistor RP1 are connected together, and the relationship between the voltage V2 and the sampling voltage V1 is as follows:

[0032]

[0033] Where R1 is the resistance value of the resistor R1, RP1 is the resistance of the resistor RP1.

[0034] The voltage dividing circuit includes a ...

no. 2 example

[0059] like figure 2 The application schematic diagram of the line loss compensation circuit of the second embodiment of the present invention is shown in the switching power source, and the present embodiment and the first embodiment differ in that the voltage division circuit is removed, and the compensation range can be further enlarged, for the power source The output end to the device-side impedance, the amount of compensation is required, and the voltage V1 outputted by the sample amplification circuit can be directly used as the compensation voltage.

no. 3 example

[0061] like image 3 The application schematic diagram of the line loss compensation circuit of the third embodiment of the present invention is shown in the switching power supply, and the present embodiment differs from the first embodiment to replace the adjustable resistor RP1 to a resistor R2 of the fixed resistance. This embodiment is suitable for the case where the line impedance is fixed, and the adjustable resistance is changed to a fixed resistance, and the mechanical external force can be reduced, resulting in a change in adjustable resistance resistance, increase the consistency of the switching power supply, and improve the compensation accuracy and stability of the switching power supply. sex.

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Abstract

The invention discloses a line loss compensation circuit, which is applied to a switching power supply, and is characterized in that the line loss compensation circuit comprises a sampling amplification circuit, a voltage division circuit and a summing circuit, wherein the sampling amplification circuit is used for inputting a sampling voltage V1 reflecting the output condition of the switching power supply and outputting a voltage V2 after amplifying the sampling voltage V1; the voltage division circuit is used for carrying out voltage division on the voltage V2 and outputting a divided voltage V3; the summing circuit is used for summing the divided voltage V3 and a reference voltage VREF and then outputting a voltage Vf, and the voltage Vf is used as the reference voltage of the switching power supply voltage loop. According to the method and the circuit, the problem that the output line loss of the switching power supply is too long, and the output line is too long, so that the output voltage drops or changes too much, and the like can be solved. The circuit has the characteristics of simple circuit structure, active adjustment, suitability for different line loss environments and low cost.

Description

Technical field [0001] The present invention belongs to the field of switching power supply, and in particular, the wire loss compensation of the switching power supply output voltage. Background technique [0002] It can be seen from the relationship V = R * I of the voltage V, resistance R, and current I. The output current of the impedance and switching power supply on the connection line of the switching power supply output to the device causes the output voltage to change the voltage on the device. The power supply voltage deviation tends to cause the device to instability, so the output voltage accuracy is an important indicator in the performance of the switching power supply. Most high power or output lines have a line loss compensation function. However, there is no advantage in the control method of existing line loss compensation, device composition, cost, structure and performance. Prior art has the following features: [0003] At present, the common line loss compens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M1/32
CPCH02M3/156H02M1/32
Inventor 不公告发明人
Owner MORNSUN GUANGZHOU SCI & TECH
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