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

Abstract

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.

Description

technical field [0001] The invention relates to a resonant frequency device, in particular to a CPT resonant frequency device based on DSP phase-locking technology. Background technique [0002] The non-contact power transmission technology based on magnetic field coupling is to wind the primary and secondary windings of the coupler on different iron cores respectively, and realize the electromagnetic energy transmission without mechanical connection between the power supply and the load, but one of the shortcomings of this technology The reason is that the stability of displacement and frequency is poor. Once a detuning state occurs, the efficiency will drop sharply. For the realization of resonance state in the field of non-contact power transmission, analog phase-locking is mostly used to realize frequency tracking. This patent uses a digital signal processor (DSP) to achieve frequency tracking through software phase-locking technology to achieve resonance. Contents of ...

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Problems solved by technology

[0002] The non-contact power transmission technology based on magnetic field coupling is to wind the primary and secondary windings of the coupler on different iron cores respectively, and realize the electromagnetic energy transmission without mechanical connection between the power supply and the load, but one of the shortcomings of this technology Due to the poor stability of displacement and frequency, once a detuning state occurs, the efficiency will drop sharply

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