Detection device of large-power induction cooker shifted full bridge hard switch and detection method thereof

Abstract

The invention discloses a detection device of a induction cooker shifted full bridge hard switch, comprising a shifted full bridge circuit, a logic driving circuit, a microcontroller, a first temperature sampling circuit, a second temperature sampling circuit, a first temperature sensing probe, a second temperature sensing probe and a power circuit, wherein the shifted full bridge circuit is installed on the surface of a induction cooker movement radiator. The detection device is characterized in that the first temperature sensing probe and the second temperature sensing probe are installed in the installation area of the shifted full bridge circuit on the surface of the movement radiator. The invention also discloses a detection method which comprises the following steps: 1. setting a reference value Test; 2. reading the temperature sampling value AD 1 of a lagging leg in the shifted full bridge circuit by the first temperature sampling circuit, and reading the temperature sampling value AD 0 of a lead leg in the shifted full bridge circuit by the second temperature sampling circuit; and 3. judging whether the difference of the temperature sampling value AD 1 of the lagging leg and the AD 0 of the lead leg is more than the reference value Test by the microcontroller; if no, returning to a main program; and if yes, cutting off the lagging leg and the lead leg by the logic driving circuit. The invention can effectively protect the lagging leg.

Description

technical field [0001] The invention relates to a detection device and a detection method of a phase-shifted full-bridge hard switch, in particular to a detection device and a detection method of the phase-shifted full-bridge hard switch of a high-power induction cooker. Background technique [0002] The phase-shifted full-bridge switching circuit of the induction cooker includes a lagging bridge arm and a leading bridge arm composed of switching devices IGBT. Under normal working conditions of loads such as coil disks and resonant capacitors, the waveforms are as follows: figure 1 As shown, the voltage phase II leads the current phase I, the leading bridge arm IGBT is turned on at zero voltage, and the lagging bridge arm IGBT is turned on at zero current. The switching losses of the leading bridge arm IGBT and the lagging bridge arm IGBT are basically the same, and the temperature difference is small. [0003] When the load is abnormal, such as water entering the coil disk...

AI Technical Summary

Problems solved by technology

If it is not protected, it will cause damage to the lagging bridge arm IGBT

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