A Safe Dynamic Switching Method of High-Frequency Soft Switching Three-phase Inverter
A three-phase inverter and soft switching technology, which is applied in the direction of high-efficiency power electronic conversion, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problem of incomplete and easily damaged auxiliary equipment in the first resonance stage. Insufficient current energy of switching tube and resonant inductor, etc., to achieve the effect of no effect on adjustment speed, no effect on work efficiency, and reduced voltage stress
Active Publication Date: 2021-06-01
ZHEJIANG UNIV
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[0002] In the traditional zero-voltage switching three-phase inverter, the output current adjustment is realized through the change of the voltage reference vector when the load is switched. On the one hand, a sudden increase in load requires a corresponding increase in the turn-off duty cycle of the auxiliary switch. The increase in the turn-off duty cycle of the auxiliary switch causes the current waveform of the resonant inductor to move upward, so that the current energy of the resonant inductor is insufficient at the first resonance, resulting in zero Voltage turn-on failure
Under the high-frequency working conditions of the device, the influence of parasitic inductance is prominent, and zero-voltage turn-on cannot be realized, so that the residual voltage on the main switch generates high voltage stress on the auxiliary switch tube through the parasitic inductance, which is easy to damage the auxiliary switch tube
The general solution, such as reducing the increase in the turn-off duty cycle of the auxiliary switch in each cycle, means that the output current adjustment amount in each cycle needs to be reduced, which will slow down the dynamic response speed of the system
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[0035] The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings. The following examples will help those skilled in the art to further understand the invention, but do not limit the invention in any form. It should be noted that on the premise of not departing from the concept of the present invention, any changes or improvements made are within the protection scope of the present invention.
[0036] Such as figure 1 As shown, it is an existing zero-voltage switch three-phase inverter circuit topology. For the control of the traditional zero-voltage switch three-phase inverter, the present invention improves on the basis of the original control method, mainly adding the limiter function (limiting module), and turn off the traditional auxiliary switch duty cycle d 0 With the output current d-axis component i d Changes are adjusted in stages (switching frequency calculation module), refer to figure 2 , the hig...
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The invention discloses a safe and dynamic switching method for a high-frequency soft-switching three-phase inverter. When the load of the soft-switching three-phase inverter changes from light to heavy, the control method of the present invention can, on the one hand, limit the magnitude of the voltage reference vector; High switching frequency to rated switching frequency can ensure safe switching of soft-switching three-phase inverters under high frequency conditions. The invention solves the problem that the voltage on the main switching tube generates high voltage stress on the auxiliary switching tube through the parasitic inductance due to the zero-voltage turn-on cannot be realized during the load switching of the soft-switching three-phase inverter. The method does not need to add additional The circuit is beneficial to broaden the application range of the soft-switching three-phase inverter under high-frequency conditions and ensure safe and stable dynamic switching.
Description
technical field [0001] The invention relates to the field of inverter control, in particular to a method for safe and dynamic switching of a high-frequency soft-switching three-phase inverter. Background technique [0002] In the traditional zero-voltage switching three-phase inverter, the output current adjustment is realized through the change of the voltage reference vector when the load is switched. On the one hand, a sudden increase in load requires a corresponding increase in the turn-off duty cycle of the auxiliary switch. The increase in the turn-off duty cycle of the auxiliary switch causes the current waveform of the resonant inductor to move upward, so that the current energy of the resonant inductor is insufficient at the first resonance, resulting in zero The voltage switch-on fails. Under the high-frequency working conditions of the device, the influence of parasitic inductance is prominent, and zero-voltage turn-on cannot be realized, so that the residual vol...
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IPC IPC(8): H02M1/088H02M7/5387
CPCH02M1/083H02M1/088H02M7/5387H02M1/0058Y02B70/10
Inventor 陈敏蔡浩清徐德鸿
Owner ZHEJIANG UNIV