A Digital Control Method for Realizing Multi-step Frequency Modulation of llc Resonant Converter
A resonant converter, digital control technology, used in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problems of not being able to meet the circuit structure at the same time, accurate and effective fast response, and high integration. Achieve the effect of improving energy transmission efficiency, low cost and strong adaptive ability
Active Publication Date: 2020-08-04
SOUTHEAST UNIV
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Problems solved by technology
[0008] The purpose of the present invention is to address the shortcomings of the above-mentioned background technology, provide a digital control method for realizing multi-step frequency modulation of an LLC resonant converter, improve the dynamic response speed of the LLC converter with a relatively simple circuit structure, and solve the problem of existing LLC resonant The digital control scheme of the converter cannot meet the technical problems of various application requirements such as simple circuit structure, high integration, and accurate, effective and fast response at high frequencies.
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[0038] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.
[0039] Such as figure 1 As shown in the prior art, a digital control method to improve the dynamic response speed of the half-bridge LLC resonant converter is proposed. On the basis of the PFC algorithm, a compensation link is added to construct a PFC controller based on the average current control mode. The digital control part includes voltage Although the two links of the loop and the current loop can improve the dynamic response speed, they increase the complexity of the algorithm and cannot meet the fast response requirements of demanding applications.
[0040] When the LLC converter is in a steady state, changes in the input voltage or output load will cause the output voltage V O fluctuations, this application proposes a step-by-step frequency regulation method that controls the difference between the output voltage and the set value within ...
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The invention discloses a digital control method for realizing multi-step frequency modulation of an LLC resonant converter, and belongs to the technical field of power generation, power transformation or power distribution. The method is implemented by a system including a voltage sampling circuit, a control circuit with a microcontroller as the core, and an isolated drive circuit. The output voltage value is sampled in each cycle. The sampling circuit collects the voltage value on the voltage dividing resistor, and the control circuit with a microcontroller as the core compares the output voltage sampling value with the set value, calculates the frequency corresponding to the maximum gain or minimum gain value point, and switches to this frequency point, After eliminating the output voltage fluctuations caused by input voltage or output load changes, make the LLC converter work at the required switching frequency and perform PI adjustment on the output voltage according to the difference between the output voltage and the set value, and finally stabilize the output voltage. Improved dynamic response speed.
Description
technical field [0001] The invention discloses a digital control method for realizing multi-step frequency modulation of an LLC resonant converter, relates to the control technology of the LLC resonant converter, and belongs to the technical fields of power generation, transformation and distribution. Background technique [0002] The improvement of the computing speed of the microprocessor requires the power supply to have the characteristics of high output current change rate and extremely small voltage fluctuation range. The dynamic response has become an important parameter of the LLC resonant converter. This parameter requires the LLC resonant half-bridge converter to be able to reach a steady state in a short time when the input voltage or output load jumps. [0003] There are many ways to improve the dynamic response speed. At present, there are two main ones. One of them is to integrate the MOS tube and the internal compensation circuit, and select a better filter de...
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Login to View More IPC IPC(8): H02M3/335
CPCH02M3/33592H02M1/0012Y02B70/10
Inventor 钱钦松秦阳胡瑞成孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV