Voltage converter with line loss compensation

Abstract

The invention discloses a voltage converter with line loss compensation, which comprises a control circuit and a line loss compensation module. Input voltage Vin is input into the control circuit; the control circuit performs voltage conversion; after the output circuit of the control circuit passes through a filtering circuit, the control circuit outputs a converted voltage VOUT; after the converted voltage VOUT passes through a conducting wire, the voltage becomes an after wire output voltage Vo; the after wire output voltage Vo is supplied to load; voltage drop is produced between the converted voltage VOUT and the after wire output voltage Vo because of the parasitic resistance Rline of the conducting wire; the line loss compensation module samples the voltage drop produced between the converted voltage VOUT and the after wire output voltage Vo and feeds back the voltage drop to the control circuit, therefore, the after wire output voltage Vo reaches the set value. The voltage converter has the advantages that the line is simple to be realized, when the voltage converter is applied to a vehicle charger, constant voltage / constant current control can be realized, and input and output ports of circuits and external components are not required to be added.

Description

technical field [0001] The invention relates to the line loss compensation technology of the output voltage in voltage conversion, in particular to the line loss compensation technology of the output voltage of the vehicle charger. Background technique [0002] Such as figure 1 The voltage converter (1) shown needs to output a constant voltage. After the output voltage is divided by the first voltage dividing resistor R1 and the second voltage dividing resistor R2, the voltage converter (1) controls the voltage value of the FB port to be equal to the voltage converter ( 1) It is realized by the internal reference voltage value. However, when the voltage converter (1) supplies power to the load, the wire connecting the voltage converter (1) and the load is often too long, the parasitic resistance of the wire is Rline, and the load current flows through the parasitic resistance Rline of the wire to generate a voltage drop. As a result, the voltage provided by the voltage con...

AI Technical Summary

Problems solved by technology

[0014] It can be seen from the voltage formula behind the line that the current voltage behind the line of the vehicle charger system changes with the load current value. Since the output of the CS+ port and the CS- port of the voltage converter is connected to a charging power line, the charging power line has a certain resistance. The output current flows through the charging power line, which will produce a corresponding voltage drop, causing the output voltage of the car charger to be lower than the set value, and there is an error, and the greater the output current, the greater the resistance of the charging line, and the error of the output voltage The bigger it is, the normal work of the post-stage load will be affected

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