Braking unit and IGBT module protection method thereof
A technology of braking unit and control board, applied in electric motor/converter plug, deceleration device of AC motor, etc., can solve the problems of long deceleration time, failure to protect the braking unit, etc., to prevent the temperature from rising too fast. High, the effect of protecting the IGBT module
Active Publication Date: 2010-05-12
ZHEJIANG JAROL SCI INSTR CO LTD
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The prior art patent No. CN200320107860.2 discloses a brake unit with a module fault detection circuit. However, when the IGBT module is short-circuited, the IGBT drive signal is not necessarily low level, such as centrifugal drying Due to its very large inertia, the deceleration time is relatively long. Once the IGBT module is short-circuited during the braking process, the motor is still rotating at high speed and is always regenerating electric energy. The bus voltage of the inverter is discharged through the braking resistor and the IGBT module. When the voltage drops below the braking voltage, the driving signal of the braking unit control circuit is still at a high level, which does not protect the braking unit
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[0015] Hereinafter, the present invention will be further described in detail in conjunction with the description of the drawings and specific embodiments.
[0016] An embodiment of the present invention adopts the following method to protect the IGBT module of the inverter braking unit: when the inverter starts to brake, the IGBT drive circuit on the brake unit control board drives the IGBT module, and the IGBT module is driven by the IGBT drive circuit When the overcurrent detection circuit on the control board detects the VCE voltage of the IGBT module, if it detects that the VCE voltage of the IGBT module exceeds the maximum value, the IGBT drive circuit immediately blocks the output to protect the IGBT module. The overcurrent detection circuit obtains the VCE voltage of the IGBT module by detecting the voltage between the DEAT pin and the VE pin of the optocoupler in the IGBT drive circuit.
[0017] In this embodiment, the VCE voltage of the IGBT module can be detected in...
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The invention provides a braking unit and an IGBT module protection method thereof. As an overcurrent detection circuit for detecting the VCE voltage of an IGBT module is arranged between an IGBT drive circuit and the IGBT module of the braking unit, when the overcurrent detection circuit detects that the VCE voltage of the IGBT module exceeds a maximum value, the IGBT drive circuit blocks output, so that the IGBT module can be protected from damage even if overcurrent occurs on large-inertia occasions.
Description
【Technical field】 [0001] The invention relates to the technical field of frequency converter braking, in particular to a frequency converter braking unit with an overcurrent detection function. 【Background technique】 [0002] The braking unit is an indispensable device in the frequency converter, so the protection measures during the working process of the braking unit are very important. The prior art patent No. CN200320107860.2 discloses a brake unit with a module fault detection circuit. However, when the IGBT module is short-circuited, the IGBT drive signal is not necessarily low level, such as centrifugal drying Due to its very large inertia, the deceleration time is relatively long. Once the IGBT module is short-circuited during the braking process, the motor is still rotating at high speed and is always regenerating electric energy. The bus voltage of the inverter is discharged through the braking resistor and the IGBT module. When the voltage drops below the braking...
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IPC IPC(8): H02P3/06H02P3/22
Inventor 肖海乐
Owner ZHEJIANG JAROL SCI INSTR CO LTD