IGBT gate driver of double-slope peak suppression analog circuit
A gate driver, analog circuit technology, applied in electric pulse generator circuits, active components to generate pulses, etc., can solve problems such as high false alarm rate, IGBT damage, and reduced system reliability.
Active Publication Date: 2020-04-14
NANJING RAIL TRANSIT SYST
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Problems solved by technology
[0003] In related technologies, single-slope control is mostly used to control the turn-on and turn-off of IGBTs. This control method will generate peak voltages on the IGBT gates. Cause IGBT damage, reducing the reliability of the system
In addition, over-current protection is mostly used for IGBT fault protection, and the false alarm rate of this protection method is high.
Method used
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[0124] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.
[0125] refer to figure 1 , figure 2 As shown, an IGBT gate driver of a double-slope peak suppression analog circuit of the present invention includes: a power supply and protection circuit, an isolation drive circuit, an IGBT overvoltage clamp circuit and an interference filter circuit;
[0126] Wherein, the power supply and protection circuit includes: a power supply circuit and a power protection circuit, the power supply circuit converts the input high-frequency alternating current into direct current, and outputs DC+25V, DC+20V, DC+12.4V and DC-25V power supplies ;The power supply protection circuit monitors the above-mentioned power supply in real time. When the power supply is abnorm...
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The invention discloses an IGBT gate driver of a double-slope peak suppression analog circuit. The IGBT gate driver comprises a power supply and protection circuit, an isolation drive circuit, an IGBTovervoltage clamping circuit and an interference filter circuit. The power supply and protection circuit converts input a high-frequency alternating current into a direct current, monitors a power supply in real time, and locks an IGBT driving signal when detecting that the power supply is abnormal; the isolation drive circuit receives a light drive signal emitted by an upper computer, converts the light drive signal into a +IGBT gate drive signal, controls the slope of an IGBT gate voltage change curve, and achieves the purpose of inhibiting a gate voltage peak through reducing the rising orfalling slope at the tail end of the curve. The overvoltage clamping circuit monitors and compares the driving signal and the voltages at the two ends of the IGBT in real time; the interference filter circuit can filter high-frequency electromagnetic interference and prevent the IGBT from being turned on by mistake. The IGBT control and protection functions are realized through the analog circuit, the output waveform is controlled through the push-pull circuit, and the IGBT drive circuit has the characteristics of high action speed and continuous and adjustable waveform.
Description
technical field [0001] The invention belongs to the technical field of control of power electronics and power automation equipment, and in particular relates to an IGBT gate driver of a dual-slope peak suppression analog circuit. Background technique [0002] At present, the application of IGBT driver technology in the field of small and medium power at home and abroad is relatively mature, mainly using digital control to realize the drive, and the function is relatively simple; IGBT combines the advantages of MOSFET and GTR, with high input impedance, fast switching speed, and good thermal stability. , On-state voltage drop, high withstand voltage, large current and other characteristics, in recent years, it has been widely used in various fields. Using a set of driving circuits with good performance can shorten the switching time, reduce switching losses, and make the IGBT work in an ideal switching state. At the same time, it is of great significance to the operating effi...
Claims
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IPC IPC(8): H03K3/021
CPCH03K3/021Y02B70/10
Inventor 李宝军马剑陈鹏花清源田立岭徐宏武
Owner NANJING RAIL TRANSIT SYST