Hybrid conduction mode inverter power supply device and its direct charge control method
A technology of inverter power supply and charge quantity, which is applied in the direction of output power conversion device, high-efficiency power electronic conversion, irreversible DC power input conversion into AC power output, etc. It can solve the problems of complex controller design and achieve magnetic elimination. Effects of core loss, reduced switching loss, and high power density
Active Publication Date: 2018-02-23
HUAZHONG UNIV OF SCI & TECH
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[0007] Aiming at the defect of complex design of the controller in the hybrid conduction mode in the prior art, the purpose of the present invention is to solve the above technical problems
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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0039] The present invention establishes a unified mathematical model in continuous mode and discontinuous mode for the inverter power supply in the mixed conduction mode, and adopts the same control algorithm, so that the inverter power supply in the mixed conduction mode can obtain excellent control performance.
[0040] Figure 3a and Figure 3b They are schematic diagrams of the waveforms of the filter inductor current in one switching cycle in the discontinuous conduction mode and the continuous conduction mode, respectively. Among them, the shaded area represents the amount of charge Q flo...
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The invention discloses a mixed conduction mode inverter power supply device and a direct charge amount control method thereof, which are suitable for high power density and high performance single-phase and three-phase inverter power supplies. The inverter power supply is composed of an inverter bridge, a filter inductor, a filter capacitor and a direct charge controller. The device adopts a filter inductance with small inductance to reduce its volume, and reduces the switching loss while reducing the magnetic core loss, and reduces the volume of the radiator, thereby increasing the power density. However, the small filter inductance allows its current to work in either continuous conduction mode or discontinuous conduction mode in each switching cycle in each power frequency cycle. Therefore, in each switching cycle, the present invention uses a direct charge controller to calculate the total charge flowing through the filter inductor in the next cycle by sampling the output voltage and load current, and realizes it by controlling the on-off time of the power switching device This amount of charge enables the device to provide a standard sinusoidal supply voltage to any load.
Description
technical field [0001] The invention belongs to the field of inverter control, and more specifically relates to a hybrid conduction mode inverter power supply device and a direct charge amount control method thereof. Background technique [0002] High power density is an inevitable trend in the development of inverter power supplies, but it is extremely difficult to increase power density. In inverter power supplies, magnetic components and heat sinks are the bottlenecks that limit the increase in power density. To achieve high power density must effectively reduce the volume while increasing the efficiency. Improving the efficiency of the inverter power supply must reduce its own losses, and these losses are mainly concentrated on the magnetic components and switching devices. Among them, the loss and volume of magnetic components are closely related to the working mode of the inverter power supply, while the volume of the radiator mainly depends on the loss of switching ...
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IPC IPC(8): H02M7/48
CPCH02M7/48H02M1/0058Y02B70/10
Inventor 张宇关清心康勇
Owner HUAZHONG UNIV OF SCI & TECH