Contactless power transmission (CPT) resonance frequency device based on digital signal processor (DSP) phase lock technique

The invention discloses a CPT resonance frequency device based on a DSP phase lock technique. The CPT resonance frequency device based on the DSP phase lock technique mainly comprises a power supply unit, an LC resonance coupler and a frequency tracking unit, wherein the frequency tracking unit comprises a digital signal processor (DSP), the pulse width modulation (PWM) input end of the DSP is connected with a power amplifier connected with the LC resonance coupler, inductors and capacitors of a primary coil and a secondary coil of the LC resonance coupler are arranged symmetrically, PWM waves produced by the DSP are converted to sinusoidal waves through second order filtering, input into the power amplifier, and outputs sinusoidal signals with certain power to the LC resonance coupler. According to the CPT resonance frequency device based on the DSP phase lock technique, signal output power of the power amplifier is controlled by PWM waves produced by the DSP, phase lock is achieved by utilizing the DSP, not only hardware circuits are simplified and cost is reduced, but also problems of burn-in, temperature drift and the like of devices in analog circuits are solved, and accuracy and speed of the phase lock are improved.