A kind of inverter pulse width modulation method
A pulse width modulation, inverter technology, applied in the irreversible DC power input into AC power output, AC power input into DC power output, output power conversion devices and other directions, can solve the problem of high temperature of IGBT and diode. , affecting the reliability of the inverter, etc.
Active Publication Date: 2017-10-17
HUNAN CSR TIMES ELECTRIC VEHICLE
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[0006] The existing inverter pulse width modulation method only directly calculates the output pulse width of each phase of the inverter according to the required AC output voltage value, which makes the IGBT and diode have the risk of overheating and affects the reliability of the inverter. sex
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[0061] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature of each embodiment in the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
[0062] Existing inverters generally use IGBTs or MOSFETs as switching devices. In this embodiment, IGBTs are selected as the switching unit of the three-phase inverter to further illustrate the inverter pulse width modulation method provided by the present invention, but this The invention is not limited thereto.
[0063] When the inverter is working, both the IGBT and the diode will generate losses. IGBT l...
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The invention discloses a pulse width modulation method of an inverter. The method comprises that according to the required voltage of each phase of a load, the initial conduction time of each phase of switch unit of the inverter is calculated; currents of load phases are collected, absolute values of the currents are calculated, the phase of the maximal absolute value serves as adjusting phase, and expected conduction time of the switch unit and a diode in the adjusting phase is calculated; the adjusting amount of the conduction time of the switch unit is calculated according to the initial conduction time of each phase of switch unit as well as the expected conduction time of the switch unit and the diode; the adjusting time is added to the initial conduction time of each phase of switch unit; according to the added conduction time of each phase of switch unit, the adjusted conduction time of each phase of switch unit is calculated; and corresponding pulse modulation signals are generated according to the adjusted conduction time. Temperature rise of the switch units and diode can be effectively balanced, and the method is conducive to improving the output capability of the inverter.
Description
technical field [0001] The invention relates to the technical field of automatic control, in particular to an inverter pulse width modulation method. Background technique [0002] Current inverters generally use Insulated Gate Bipolar Transistor (IGBT for short) or Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET for short) as switching devices. Due to the material characteristics of semiconductors, the safe operating junction temperature of IGBT and MOSFET chips is usually below 150°C, and the temperature of the chip may cause permanent damage to the chip after exceeding the safe limit of the junction temperature. In order to reduce the temperature rise of the chip during operation, two measures are usually taken: one is to minimize the heat dissipation thermal resistance from the chip to the cooling medium; the other is to minimize the loss of the chip during operation. [0003] When the inverter works at zero load frequency or low load frequency (such as a three...
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IPC IPC(8): H02M7/48H02M7/5387
Inventor 蒋时军杨洪波王征宇陈建明刘毅梁松凌岳伦石高峰易慧斌
Owner HUNAN CSR TIMES ELECTRIC VEHICLE