An optimal control method for a bidirectional full-bridge unilateral three-level dc-dc converter
A DC-DC, optimized control technology, applied in the direction of adjusting electrical variables, control/regulation systems, DC power input to DC power output, etc., can solve the problem of reducing converter efficiency, increasing the current stress of power devices, and increasing the switch Problems such as device and magnetic component loss, to achieve the effect of reducing switching loss, reducing current stress, and reducing on-state loss
Active Publication Date: 2020-08-14
成都拓及兴通科技有限公司
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Problems solved by technology
If there is power backflow during system operation, in order to make up for the backflow power and achieve the specified transmission power, the output current must be increased, thereby increasing the current stress of the power device, thereby increasing the loss of the switching device and magnetic components, and reducing Converter Efficiency
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[0025] The structure of the bidirectional full bridge unilateral three-level DC-DC converter is as figure 1 Shown, where S 11 ~S 18 , S 21 ~S 24 Is the switch tube, C 1 ~C 3 DC stabilized capacitor, D 1 ~D 4 Is the clamp diode, L is the sum of the external inductance and the leakage inductance of the transformer, MFT is the intermediate frequency transformer, V 1 Is the input DC voltage, V 2 Is the output DC voltage. The bidirectional full-bridge unilateral three-level DC-DC converter is composed of two full-bridge circuits, an intermediate frequency transformer and three DC stabilized capacitors. Among them, the high-voltage side (primary side) full bridge has a three-level structure, and the voltage stress of each switch tube is only half of the high-voltage side DC voltage; the low-voltage side (secondary side) full bridge has a two-level structure. This kind of converter is especially suitable for occasions where the voltage amplitude difference between the two sides is lar...
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The invention discloses a control method for the minimum return power of a bidirectional full-bridge unilateral three-level DC-DC converter. There are two control quantities in the topology structure of the bidirectional full-bridge unilateral three-level DC-DC converter that can be controlled , which are the midpoint voltage duty cycle D of the high-voltage side (primary side) bridge arm 1 The phase shift angle between the primary and secondary bridge arm midpoint voltages realizes the control of the minimum return power of the converter under the premise of meeting the power required by the transmission load. The invention control method can be realized: coordinated control D 1 , Realize the purpose of bidirectional transmission of power between the primary side and the secondary side, and in the case of meeting the power required by the load, minimize the return power of the converter, thereby reducing the current stress of the power device, thereby reducing the on-state of the switching device and magnetic components loss. At the same time, within the entire transmission power range, all the switching tubes in the circuit can realize zero-voltage conduction, which effectively reduces the switching loss of the power device.
Description
Technical field [0001] The invention relates to the technical field of control of power electronic devices. Background technique [0002] The isolated bidirectional DC-DC converter is a DC-DC converter that can operate in two quadrants and can achieve electrical isolation on the input and output sides. It is widely used in electric vehicles, new energy power generation and smart grids. [0003] The more commonly used isolated bidirectional DC-DC converter is a bidirectional full-bridge two-level circuit structure, which is composed of two symmetrical H-bridges, an intermediate frequency transformer and two DC stabilized capacitors. This kind of converter has simple structure, high power density, large voltage transformation ratio, electrical isolation and bidirectional energy flow. But in this converter topology, the voltage that each switch tube bears is the input voltage or the output voltage, so this structure is not suitable for energy storage systems with high voltage on one ...
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IPC IPC(8): H02M3/335
Inventor 韩鹏程何晓琼赵智钦陈阳陈晨舒泽亮
Owner 成都拓及兴通科技有限公司