A feedback circuit and feedback method for compensating line loss voltage

A feedback circuit and compensation line technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as insufficient power supply voltage and abnormal use of electrical load equipment, and achieve accurate voltage values, increased output voltage, The effect of low implementation cost

Active Publication Date: 2021-01-26
NINGBO POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the switching power supply is in use, it is necessary to connect the output positive and negative poles of the switching power supply to the electrical load equipment through external wires and connectors. Since the external wires have internal resistance and the connectors have contact resistance, when the current flows through them The loss voltage is the line loss voltage. The line loss voltage causes the voltage at both ends of the electrical load equipment to be lower than the output voltage of the switching power supply. The voltage at the terminal will be much lower than the output voltage of the switching power supply, so that the actual power supply voltage supplied to the electrical load equipment is insufficient, and it is easy to cause the electrical load equipment to not work normally.

Method used

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  • A feedback circuit and feedback method for compensating line loss voltage
  • A feedback circuit and feedback method for compensating line loss voltage
  • A feedback circuit and feedback method for compensating line loss voltage

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Embodiment 1

[0044] This embodiment provides a feedback circuit for compensating line loss voltage, such as Figure 1 to Figure 2 As shown, the circuit includes:

[0045] The current detection module is used to detect the output current Io of the feedback circuit in real time through the sampling resistor Rc;

[0046] The voltage outer loop feedback module is used to introduce the line loss voltage Us calculated according to the preset line loss resistance Rs and the output current Io, combine the line loss voltage Us, the reference voltage VREF and the voltage feedback value Uop on the load, and output the external Loop feedback voltage deviation Uob;

[0047] The output current inner loop feedback module is used to combine the received outer loop feedback voltage deviation Uob with the output voltage UIo corresponding to the output current, and output the inner loop feedback circuit voltage EAP signal to the power chip.

[0048] Further, the current detection module includes: a resisto...

Embodiment 2

[0078] This embodiment provides a switching power supply for new energy vehicles. The input voltage is DC230-370V, and the output is DC14.2V / 70A. It is a typical switching power supply with high voltage and high current output. The topology adopts phase-shifting full-bridge current doubling synchronous rectification. circuits, such as image 3 As shown, the detailed feedback circuit is as Figure 4 As shown, the power chip adopts UCC28950PW, and its minimum system is as follows Figure 5 shown.

[0079] Such as image 3 In the topological structure, phase-shifted full-bridge current doubling synchronous rectification topology is used as the power stage circuit, and clamping diodes are used in the primary stage. The four MOSFET models of the primary stage are STP25NM60N, and the models of clamping diodes D1 and D2 are STTH8R06D. Synchronous rectification 2 MOSFET models use IRFP4368, transformer T1 uses PQ40 magnetic core, inductor L2 uses EI40 magnetic core, inductors L1 an...

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Abstract

The invention discloses a feedback circuit for compensating the line loss voltage, which is used to compensate the line loss voltage caused by the line loss resistance in the output circuit of the power supply. The output current Io; the voltage outer loop feedback module is used to introduce the line loss voltage Us calculated according to the preset line loss resistance Rs and the output current Io, and the line loss voltage Us, the reference voltage VREF and the voltage feedback value Uop on the load Combining to output the outer loop feedback voltage deviation Uob; output current inner loop feedback module, used to combine the received outer loop feedback voltage deviation Uob with the output voltage UIo corresponding to the output current, and output the inner loop feedback circuit voltage EAP signal to the power chip. By increasing the expected value of the output voltage, the line loss voltage is compensated, so that the output voltage of the switching power supply connected to the load terminal is more accurate, and at the same time, the maximum value of the output current can be limited for short-circuit protection.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a feedback circuit and a feedback method for compensating line loss voltage. Background technique [0002] Switching power supply is an important power conversion device, which is indispensable in all walks of life. [0003] When the switching power supply is in use, it is necessary to connect the output positive and negative poles of the switching power supply to the electrical load equipment through external wires and connectors. Since the external wires have internal resistance and the connectors have contact resistance, when the current flows through them The loss voltage is the line loss voltage. The line loss voltage causes the voltage at both ends of the electrical load equipment to be lower than the output voltage of the switching power supply. The voltage at the terminal will be much lower than the output voltage of the switching power supply, so that the actual ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 刘珺
Owner NINGBO POLYTECHNIC
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