Modulation system and method of cycle conversion type high-frequency link inverter

A cycle-to-wave converter and the technology of cycle-to-wave transformation are applied in the direction of conversion devices that convert irreversible DC power input into AC power output, and AC power input into DC power output and output power, etc. Converter inductor current hard turn-off and other issues, to reduce conduction loss, improve efficiency, and optimize the soft switching range.

Pending Publication Date: 2022-05-13
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the dead zone overlap time is added during the commutation of the secondary side under the two modulation strategies, so that the secondary side switches are all turned on for soft commutation, the leakage inductance current still exists during commutation
When the switching tube is turned off, the current in the commutation switching tube has no flow path and is forced to drop to zero, which will generate a large voltage spike at both ends of the secondary side switching tube, and there is a problem that the inductor current of the cycloconverter is hard turned off

Method used

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  • Modulation system and method of cycle conversion type high-frequency link inverter
  • Modulation system and method of cycle conversion type high-frequency link inverter
  • Modulation system and method of cycle conversion type high-frequency link inverter

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Embodiment

[0072] figure 1 is the overall control block diagram of the cycle conversion type high-frequency link inverter, figure 2 It is a flow chart of the modulation method of the cycle conversion type high-frequency chain inverter. The output voltage and current are sampled and enter the closed-loop controller. The controller outputs a sinusoidal reference voltage, which is compared with the carrier wave and transformed by the logic module to realize the generation of the switch tube drive signal. The simplified logic sequence of the converter is as follows image 3 As shown, the diagonal switch tubes of the primary side switching tubes are both on and off at the same time, the upper and lower switches of the same bridge arm are complementary to conduct 180°, and the switching tubes of the secondary side cycle converter pass the phase shift angle m(t)T s / 2 to transmit energy, and the phase shift angle varies with sine.

[0073] According to the equivalent model of the converter, ...

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Abstract

The invention discloses a modulation system and method for a cycle conversion type high-frequency link inverter. The system comprises a main circuit topology, a double-closed-loop controller and a switch modulation strategy module. The method comprises the following steps of: analyzing a relationship between voltage stress and a switching time sequence by taking the voltage stress of a switching tube as a starting point, obtaining switching combinations under different modulation strategies through states of leakage inductance current of a transformer under different modulation strategies, and realizing energy transmission between the primary side and the secondary side of the converter; establishing a converter dynamic mathematical model to obtain a transfer function of the system; and designing a discrete controller to obtain a reference modulation wave, and finally, designing a logic relationship between corresponding switching tubes to realize the safe soft commutation of the cycloconverter and the converter function. According to the invention, an effective modulation strategy is provided for the high-frequency link inverter, the leakage inductance current of the transformer is naturally reduced to zero, the voltage stress generated by the interruption of the inductive current during the commutation of the switching tube can be reduced, the soft switching of the converter can be realized, and the method has very high practicability.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a modulation system and method for a cycle conversion type high-frequency link inverter. Background technique [0002] Common inverters can be divided into power frequency isolation type and high frequency isolation type according to transformer isolation. Compared with traditional industrial frequency transformers, the use of high frequency transformers will reduce the size of the system and increase the power density of the converter. Compared with non-isolated inverters, high-frequency link inverters can achieve electrical isolation on the input and output sides, and at the same time can achieve voltage matching, which is of great significance for some applications with relatively low input voltage. The high-frequency link inverter can also be applied in the rectification link, which can realize the bidirectional flow of energy, and can use special modulation strate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/5387H02M1/088
CPCH02M7/4807H02M7/53871H02M1/088
Inventor 江驰孙志超嵇保健
Owner NANJING UNIV OF SCI & TECH
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