A kind of igbt drive and wave-by-wave current limiting circuit control method
A wave-by-wave current limiting and circuit control technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as main power tube damage and switching device damage, and achieve the effect of improving system stability
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Embodiment 1
[0055] Embodiment 1: An IGBT driving and wave-by-wave current limiting circuit control method, such as figure 1 and figure 2 shown, the specific steps are as follows:
[0056] S1. Connect the current transformer to the IGBT transistor, the current transformer detects the current value of the transformer when the IGBT transistor is turned on, and transmits the collected current value to the wave-by-wave current limiting circuit.
[0057] S2, combined image 3 , the wave-by-wave current limiting circuit will amplify the current value obtained by the amplifying circuit to a small amplitude ratio and then output it. The wave-by-wave current-limiting circuit rectifies the current value with a small amplitude ratio and rectifies it through a diode half-bridge to form a steamed bun wave. The wave-by-wave current limiting circuit inputs the steamed bread wave into the comparison circuit. When the peak value of the steamed bread wave exceeds the reference voltage of the inverse input...
Embodiment 2
[0062] Embodiment 2, an IGBT driving and wave-by-wave current limiting circuit control method, the difference between this embodiment and Embodiment 1 is that it further includes the following steps:
[0063] S6. The memory of the microprocessor receives the steamed bread wave generated by the wave-by-wave current limiting circuit in real time, and the memory stores the peak value of the steamed bread wave.
[0064] S7 , the microprocessor regularly calls the peak value of the steamed bun wave stored by the microprocessor, and the microprocessor selects the peak value of the steamed bun wave as the y-axis and the time as the x-axis to create a waveform diagram. The microprocessor sends the waveform back to the memory for storage, and at the same time deletes the peak value of the steamed bread wave stored in the memory corresponding to the waveform.
[0065] S8. After the microprocessor receives the self-checking instruction, it calls the waveform diagram stored in the memory,...
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