Phase detection device and method

Abstract

The invention relates to a phase detection device and method, which are characterized in that the dead time of a drive circuit is detected by using a dead time detection unit, the phase information of a loaded current zero-crossing point is detected by using a loaded current detection unit, and the phase relationship between the loaded voltage and the loaded current is judged according to the detection results of the dead time detection unit and the loaded current detection unit. The phase detection device and method provided by the invention are accurate in detection, strong in anti-jamming capability, and low in cost.

Description

Technical field [0001] The present invention relates to the field of digital circuits, in particular to a phase detection device and method. Background technique [0002] In many circuits, especially electromagnetic heating circuits, reasonable control of the load voltage and current phase can achieve power regulation, reduce losses, and avoid damage to high-power components. Therefore, it is of great significance to detect the load voltage and current phase. The common detection method is to use phase-locked loop integrated circuit or through high-performance microprocessor detection. The phase-locked loop integrated circuit compares the frequency-divided output signal with the phase reference signal extracted from the signal, and uses the phase difference value. Change to determine the phase relationship between the load voltage and the load circuit, so as to achieve the purpose of frequency locking. Its disadvantage is that the circuit is complicated and easy to be interfered ...

AI Technical Summary

Problems solved by technology

A common detection method is to use a phase-locked loop integrated circuit or a high-performance microprocessor to detect. The phase-locked loop integrated circuit compares the frequency-divided output signal with the phase reference signal extracted from the signal, and uses the phase difference Change to judge the phase relationship between the load voltage and the load circuit, so as to achieve the purpose of frequency locking. The disadvantage is that the circuit is complex, and it is easy to be interfered, so that the phase cannot be locked. The use of high-performance microprocessors also has high requirements for software reliability and high cost. high disadvantage

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