igbt protection control method
A technology of protection control and threshold, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of complex accurate calculation, time-consuming and labor-intensive problems
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Embodiment 1
[0046] Embodiment 1 provides a protection and control method for IGBTs, which performs overcurrent, overvoltage and overtemperature on the IGBT (600V, 50A) used in the internal DC-DC boost circuit of a certain single-phase off-grid 3KW photovoltaic inverter product. Monitoring, the main control chip uses a 32bit microcontroller of a certain brand, which specifically includes the following steps:
[0047] Step 1: Set the bus voltage threshold V bth Set to 450V, the IGBT gate drive voltage threshold V gth Set to 5.25V, the collector operating current first threshold I cth_1 Set it to 18.00A, which is about 1.5 times the rated current value, and set the collector operating current to the second threshold I cth_2 set to 30.00A, about 2 times the rated current value, the T igbt_th Set to 120°C;
[0048] Step 2: Collect the working parameters of the IGBT in the current IGBT application system through the voltage, current, and temperature acquisition unit, and obtain the current ...
Embodiment 2
[0056] Embodiment 2 provides a kind of protection control method of IGBT, and the IGBT (600V, 50A) used in the upper bridge of the DC-AC inverter full bridge circuit in the inverter is monitored for overcurrent, overvoltage, overtemperature and power consumption, The specific methods and steps are as follows:
[0057] Step 1: Set the bus voltage threshold V bth Set to 450V, the IGBT gate drive voltage threshold V gth Set to 5.25V, the collector operating current first threshold I cth_1 Set it to 18.00A, which is about 1.5 times the rated current value, and set the collector operating current to the second threshold I cth_2 set to 30.00A, about 2 times the rated current value, the T igbt_th Set to 120°C, switching energy consumption E ts is 2.6mJ, the current switching frequency is 22Khz, and the conduction nominal current I n is 15A, the power consumption estimation coefficient K is 1.385, and the power consumption threshold P th It is 310W, n and m are set to 10;
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