Abstract: In order to solve the problem that the charging electric appliance safety testing, A test normal ac power detection circuit introduced in this paper, Analyzed the principle of the circuit and the circuit simulation test. And then to the test circuit hardware physical structures, and the test results are recorded. Analysis and data processing through the control chip of A/ D module, and then to determine whether a rechargeable electric complete charging process and the judgment result feedback to the user, To achieve the charging electric safety control. The main characteristics of this circuit is of simple structure design, debug, in the actual test has very high reliability and stability.

Key words: NuMicro M0516 chip, charging protection, AC power