LLC conversion efficiency optimization method
An optimization method and technology of conversion efficiency, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, high-efficiency power electronic conversion, etc., can solve the problems of falling resonance frequency, low efficiency, and high resonance frequency, and reduce switching losses. , high efficiency
Inactive Publication Date: 2020-04-14
厦门市爱维达电子有限公司
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However, as the power increases, for example, the maximum output current of a 3kw machine can reach 220A. As the load continues to increase, the LLC output voltage VLLC=Vo+IR also increases, causing the resonance frequency to decrease. If a constant bus voltage is used, the vehicle-mounted DCDC When working at light load, the resonant frequency is very high and the efficiency is low. How to provide a technical solution for LLC efficiency optimization in the full load range is a problem to be solved by those skilled in the art. Therefore, the present invention proposes an LLC conversion efficiency optimization method to address the deficiencies in the prior art
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[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0017] according to figure 1 As shown, this embodiment proposes a method for optimizing LLC conversion efficiency, including the following steps:
[0018] Step 1: Construct a two-stage conversion topology of BOOST circuit + LLC resonant converter, and set a separate PI controller in the BOOST circuit. The duty cycle D of the PI controller satisfies the description of formula (1), and the BOOST circuit adopts A closed-loop control method, the LLC resonant conv...
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The invention discloses an LLC conversion efficiency optimization method, which comprises the following steps of: constructing a two-stage conversion topological structure of a BOOST circuit and an LLC resonant converter, and arranging an independent PI controller in the BOOST circuit; detecting a load current signal in the LLC resonant converter, and transmitting the load current signal to a PI controller; correspondingly adjusting the bus voltage of the LLC resonant converter according to different loads in the boost process of the BOOST circuit, and enabling the boost output value of the BOOST circuit to serve as the bus voltage value of the LLC resonant converter. According to the invention, the bus voltage of the LLC resonant converter is correspondingly adjusted according to different loads in the boost process of the BOOST circuit; the boost output value of the BOOST circuit serves as the bus voltage value of the LLC resonant converter, the LLC resonant converter is controlled to work at the resonant frequency, high efficiency can be achieved within the full-load range, and switching loss can be reduced.
Description
technical field [0001] The invention relates to the technical field of LLC efficiency optimization, in particular to an LLC conversion efficiency optimization method. Background technique [0002] Since its birth, LLC resonant converter has received more and more attention because of its outstanding advantages. The LLC resonant converter can realize the soft turn-on of the primary side switching tube in the whole working range, even if the switching frequency is high, it can still achieve high efficiency. The increase of switching frequency is beneficial to reduce the volume of transformer and filter, and the resonant inductance and excitation inductance can be integrated into the transformer, so high power density can be achieved; [0003] At present, BOOST+LLC two-stage conversion is a commonly used DCDC conversion topology. For example, a 400V battery is converted into a 14V low-voltage power supply. BOOST obtains a stable bus voltage, and LLC adjusts the frequency to ob...
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Login to View More IPC IPC(8): H02M3/335
CPCH02M3/33507H02M1/0054H02M1/007Y02B70/10
Inventor 苏坚坚陈一逢
Owner 厦门市爱维达电子有限公司