What is the "Kang copper wire" on the circuit board of the induction cooker?
1. Detect the change of the main circuit current through the current transformer, obtain the change voltage signal from the secondary of the current transformer, obtain the pulsating voltage signal through the rectifier and filter, and send it to the single chip microcomputer for testing.2, with sampling resistance of a series resistance of minimal resistance in 1GBT of the triode (here will change the constantan wire) potential of the operational amplifier into the microcontroller. This method has the advantages of low cost, is the main day after.
In the design of regulated power supply function: over-current protection, test load current.
Features: low temperature coefficient of resistance, wide range of temperature (480 degrees Celsius), good processability, good welding performance. Mainly used in the manufacture of instruments, meters, electronic and industrial equipment in electronic components.