Industrial frequency-harmonic interference resistant signal sampling method and system
A signal sampling and harmonic interference technology, applied in the field of signal sampling methods and systems against power frequency and its harmonic interference, can solve the problem of not being able to take into account the performance of signal fidelity, cost, resource occupation, calculation time, real-time tracking, etc. and other problems, to achieve the effect of eliminating power frequency interference and achieving simple
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Embodiment 1
[0048] Figure 4 It is an embodiment applied to the touch detection system of an induction cooker, which uses the built-in hysteresis comparator function of the single-chip microcomputer to receive the synchronous signal, and the detection sampling is obtained through data acquisition through an AD converter with a multi-way switch.
[0049] Figure 5 A schematic diagram of a preferred 100Hz power frequency synchronous circuit in this application example, which uses the ground wire of the rectifier bridge of the induction cooker to form a loop. The 50Hz AC signal of the mains is rectified by D1 and D2 to obtain a 100Hz full-wave signal. R1 plays the role of shunting and freewheeling. C1 blocks DC and communicates with AC. R2 and C1 form a partial voltage. C1, R1 and R2 cooperate to form a high-pass filter circuit, output C1 is the charging and discharging voltage waveform on C1, C2, R2 and C3 are RC-π filter circuits, which are used to filter out high-frequency clutter, and D...
Embodiment 2
[0053] Figure 8 It is an embodiment applied to the touch detection system of an electric water heater. In this application, the power frequency synchronous signal circuit is directly output to the external interrupt port of the single-chip microcomputer, and the data sampling is controlled through its interrupt function, and the detection sampling is through a multi-channel AD converter (can be simultaneously Convert multiple channels) for data acquisition.
[0054] Figure 9 A schematic diagram of a preferred 50Hz power frequency synchronous circuit in this application example, the ground wire of the circuit is connected to the ground wire of the electric water heater to form a loop. The other end is connected to the L line or N line end of the mains, and a stable digital square wave synchronization signal is obtained after successively passing through the resistance-capacitance step-down module, RC-π filter module, and voltage stabilization protection module.
[0055] F...
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