Optimal control method for cascaded full-bridge multi-level power amplifier device loss equalization

A power amplifier and loss-leveling technology, which is applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc. Design problems and other problems to achieve the effect of ensuring a balanced effect

Active Publication Date: 2020-08-14
GUANGDONG ZHICHENG CHAMPION GROUP
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  • Application Information

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Problems solved by technology

However, when the cascaded full-bridge power amplifier system based on an independent DC power supply adopts model predictive control, if the output level distribution is not reasonable, it will easily cause uneven distribution of losses among the full-bridge sub-modules, resulting in uneven heat dissipation of the system. System design creates difficulties, and on the other hand, it also brings uncertainty to the stable and reliable operation of the power amplifier system

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  • Optimal control method for cascaded full-bridge multi-level power amplifier device loss equalization
  • Optimal control method for cascaded full-bridge multi-level power amplifier device loss equalization
  • Optimal control method for cascaded full-bridge multi-level power amplifier device loss equalization

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Embodiment Construction

[0022] The present invention comprises the following steps:

[0023] 1) The power amplifier is composed of N full-bridge sub-modules cascaded, and the DC side of each sub-module is connected in parallel with a constant DC voltage source U dc , the AC output is connected to the load resistor R and the filter inductor L;

[0024] 2) Establish a continuous mathematical model between the power amplifier output level state H and the output current i,

[0025]

[0026] And the prediction model of the output current of the power amplifier is deduced by Euler's formula,

[0027]

[0028] where T s Indicates the sampling period of the system, i(k) indicates the sampling value of the output current at the current moment, and i(k+1) indicates the predicted value of the output current at the next moment.

[0029] 3) The power amplifier samples the output current i and the reference output current i ref At the same time, it is brought into the prediction model to calculate the re...

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Abstract

The invention discloses a cascaded full-bridge type multi-level power amplifier device loss balance optimization control method, aiming at the cascaded full-bridge type multi-level power amplifier adopting independent DC power supply, establishing a cascaded full-bridge multi-level power amplifier Output the continuous mathematical equation to obtain the output discrete mathematical equation of the cascaded full-bridge multi-level power amplifier; compare the current sampling output current i with the reference output current i ref Substituting the output discrete mathematical equation to obtain the optimal output level N of the cascaded full-bridge multi-level power amplifier at the next moment opt ; Define the reliable input coefficient λ of the full-bridge sub-module, and calculate the corresponding λ of each full-bridge sub-module in real time according to whether each full-bridge sub-module operates and the output current of the power amplifier; sort the λ of all modules, and sort them from large to large Small sequential selection|N opt |The sub-modules jointly output the optimal level N opt . The invention can not only ensure the fast tracking of the output current, but also realize the balance control of the switching loss of each full-bridge sub-module.

Description

technical field [0001] The invention relates to the balanced optimization control of sub-module loss of a cascaded full-bridge multi-level power amplifier device powered by an independent direct current, in particular to a loss balanced optimization control method of a cascaded full-bridge multi-level power amplifier device. Background technique [0002] With the rapid development of power electronics, power amplifiers have been more and more widely used in various occasions such as industrial production, scientific research and teaching. In terms of topology, traditional analog power amplifiers are often used in low-power audio sounding equipment due to their high-fidelity characteristics. With the improvement of power level requirements for power amplifiers in applications, the defects of low operating efficiency of traditional analog power amplifiers gradually emerged, and switching digital power amplifiers emerged as the times require. Switching digital power amplifiers...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/53871H02M1/0048Y02B70/10
Inventor 罗安郭鹏徐千鸣岳雨霏何志兴陈燕东肖牧轩欧阳红林章兢李民英
Owner GUANGDONG ZHICHENG CHAMPION GROUP
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