Dead zone compensation method and device for three-phase inverter
A three-phase inverter, dead zone compensation technology, applied in output power conversion devices, AC power input into DC power output, electrical components and other directions, can solve the output current distortion, zero current clamping, current ambiguity and other problems to achieve the effect of reducing design cost, avoiding false compensation, and improving accuracy
Inactive Publication Date: 2015-09-16
SHANGHAI ZHONGKE SHENJIANG ELECTRIC VEHICLE
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Problems solved by technology
Among them, the offline dead zone compensation strategy is simple and easy to implement, but it needs to detect the polarity of the inductor current. If the judgment of the current zero-crossing point is not accurate enough, it will lead to false compensation.
The online dead zone compensation method does not need to detect the polarity of the inductor current, but it needs to monitor the data in real time and return it to the processor for calculation, which increases the burden on the processor and increases the complexity of the system, making it difficult to implement
[0004] At present, off-line dead zone compensation is generally used. Although many compensation methods can achieve good compensation effects, in low-speed and light-load situations, zero-current clamping often occurs, causing distortion of the output current, and at the same time, the current is fuzzy near the zero point. accuracy, accurate zero point detection is difficult, resulting in reduced accuracy of dead zone compensation
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[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0019] In the embodiment of the present invention, the effect of adding the dead time on the output waveform of the inverter can be analyzed first through the dead time effect. figure 1 It is the main circuit diagram of the three-phase inverter in the embodiment of the present invention. In an ideal situation, the upper and lower switching devices of each bridge arm are strictly turned on and off in turn, but in reality, it takes a certain amount of time for e...
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The invention provides a dead zone compensation method and device for three-phase inverter. Through detecting phase voltage state corresponding to a middle point of a twin bridge arm of the inverter and judging the corresponding inductive current polarity according to the phase voltage state, dead zone compensation to the phase is realized according to the inductive current polarity of the phase. Inductive current polarity judgment accuracy can be improved effectively, so that error compensation caused by inaccurate inductive current polarity judgment can be avoided effectively and dead zone compensation accuracy can be improved. At the same time, the method does not need to detect inductive current directly, so that influence caused by zero current clamping is avoided. A need for a current sensor with comparatively high precision is removed, so that design cost is reduced.
Description
technical field [0001] The invention relates to power control technology, in particular to a dead zone compensation method and device for a three-phase inverter, and belongs to the technical field of power electronics. Background technique [0002] Space vector pulse width modulation technology is widely used in the field of permanent magnet synchronous motor control, in which the inverter is the key component of pulse width modulation, and the output waveform of the inverter directly affects the performance of the permanent magnet synchronous motor. In industrial applications, due to the signal storage effect of the inverter switching tube, there is a certain turn-off delay. In order to prevent the short circuit of the same bridge arm of the inverter from burning out the electronic device, one electronic device in the same bridge arm must be completely turned off. After the switch is off, another electronic device can be turned on. For this reason, a certain dead time must ...
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IPC IPC(8): H02M7/5387
Inventor 谢启河高翔林利吕川威赵艳刘竹
Owner SHANGHAI ZHONGKE SHENJIANG ELECTRIC VEHICLE