Method and circuit for confirming correctness of signal and charging system using same

Abstract

The invention provides a method and circuit for confirming correctness of a signal and a charging system using same. A method for confirming correctness of a signal includes: providing a current to flow through a time-dependent impedance circuit, wherein the time-dependent impedance circuit provides at least two resistances at two different time points, the current flowing through the time-dependent impedance circuit to generate a first voltage at a first time point, and the current flowing through the time-dependent impedance circuit to generate a second voltage at a second time point, the first voltage and the second voltage being different from each other. When a predetermined relationship exists between the first voltage and the second voltage, it is confirmed that a signal provided from a node coupled to the time-dependent impedance circuit is correct.

Description

technical field [0001] The present invention relates to a method and circuit for confirming the correctness of signals and a charging system using the circuit, in particular to a method and circuit for confirming the correctness of signals through the voltage variation relationship, and a charging system using the circuit. Background technique [0002] Please refer to figure 1 , which shows a schematic block diagram of a prior art charging system. like figure 1 As shown, the prior art charging system 100 includes a power supply 10 , a cable 70 and an electronic device 20 . The power supply 10 and the electronic device 20 are coupled to each other via a cable 70 . The power supply 10 includes a power converter 11 and a control circuit 12 , wherein the control circuit 12 controls the operation of the power converter 11 . The electronic device 20 includes a load 21 . The cable 70 includes a positive power transmission line 71 , a negative power transmission line 73 and a s...

AI Technical Summary

Problems solved by technology

[0003] Under normal conditions, the voltage of node CC2 is equal to VA*R12 / (R11+R12); however, under abnormal conditions, when there is dust or dirt on the port connecting the electronic device 20 and the cable 70, it may cause a negative power supply Another conduction path between the transmission line 73 and the signal transmission line 72 is represented by a dashed resistor R13

As a result, the voltage of the node CC2 will be out of alignment, causing the signal provided from the electronic device 20 via the node CC2 to be incorrect.

The defect of this prior art is that the charging system 100 cannot know whether the signal provided by the electronic device 20 (power receiving end) via the node CC2 is correct or not.

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