Method and system for optimizing efficiency of LLC ((Logical Link Control) topology and LLC topology system
A technology of efficiency optimization and topology change, which is applied in the direction of conversion equipment with intermediate conversion to AC, can solve the problems of increased switching loss, large resonant cavity loss, and far away operating frequency, and achieves expanded working range, low loss, and high efficiency. high effect
Active Publication Date: 2013-04-17
VERTIV CORP
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[0022] 3. Working frequency fFigure 5 As shown, the lower the operating frequency under the same load, the greater the loss caused by the circulating current of the resonant cavity
This causes the operating frequency of the system to be far away from the resonant frequency point, increasing the switching loss and the loss caused by the circulating current of the resonant cavity, which becomes the bottleneck of improving the system efficiency
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[0057] Please refer to Figure 6 , the LLC topology efficiency optimization method of an embodiment of the present invention comprises the following steps:
[0058] Step 1: Detect the voltage of the battery at the input end of the LLC topology;
[0059] Step 2: Calculate the given output voltage as follows: Vbus=n*Vin, wherein Vbus is the output voltage, Vin is the input voltage, and n is the transformation ratio of the secondary side of the transformer to the primary side, preferably further calculating the given output voltage is K*n*Vin, where K is the adjustment coefficient determined according to the influence of parasitic parameters on the system gain;
[0060] Step 3: Adjust the bus voltage at the output end of the LLC topology to a given output voltage.
[0061] Preferably, step 1' is further included before step 3: detecting the output voltage of the LLC topology; said step 3) includes adjusting according to the detection result of the output voltage. This enables ...
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The invention discloses a method for optimizing the efficiency of an LLC (Logical Link Control) topology, comprising the following steps of: (1) detecting the input voltage of the LLC topology; (2) calculating the given output bus voltage according to the detected input voltage as follows: Vbus=n*Vin, wherein Vbus is the output bus voltage of the LLC topology, Vin is the input voltage, and n is the no-load voltage ratio of the auxiliary side to the primary side of a transformer; and (3) adjusting the output voltage of the LLC topology to the given output bus voltage. The invention also discloses a relevant system for optimizing the efficiency of the LLC topology and an LLC topology system. In the method, the working frequency of the LLC topology is maintained nearby a resonant frequency point so that the working range of the system at the resonant frequency point is expanded, and the integral working efficiency of the system is improved.
Description
technical field [0001] The invention relates to a switching power supply, in particular to an LLC topology efficiency optimization method and system. Background technique [0002] At present, the LLC topology in the industry is mainly used in the occasions where the post-stage of the PFC (power factor correction) circuit is added to the LLC step-down. For the industrial application of battery boosting, there are almost no products formed in the industry. The main reason is that the low-voltage and high-current environment causes the high-frequency and high-efficiency characteristics of the LLC topology to perform poorly. However, due to the controllable turn-off loss of the LLC topology, and the low-voltage low-impedance MOSFET (Metal Oxide Semiconductor Field Effect Transistor) can be used as the switch tube, the optimized control can make the system efficiency much better than the traditional PWM (Pulse Width Modulation) ) converter. The LLC topology applied to battery b...
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IPC IPC(8): H02M3/28
Inventor 卫中俊刘芳
Owner VERTIV CORP