LLC resonant converter and method for suppressing ripple in output voltage thereof
A technology of resonant converter and main converter, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., which can solve problems such as unsatisfactory and difficult stability, and achieve the effect of ripple suppression
Active Publication Date: 2017-01-11
ASTEC INT LTD
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Benefits of technology
This technology helps prevent damage caused from fluctuations or disturbances that may occur during power supply systems used with electronic devices such as computers. It involves adjustments made based upon feedback signals obtained through an amplifier connected between two inductors placed close together at different points along their length. These modifications help reduce variations in current flow when there are changes in load impedance (L). By controlling this modification, it becomes possible to improve efficiency and performance without causing any problems like excessive heat generation due to increased resistance values near certain parts of the system's components.
Problems solved by technology
The technical problem addressed in this patents relates to improving the quality (effectiveness) of low voltage power supply systems that use lanthanum oxide ceramic capacitors called LC filters for energy storage purposes. Specifically, there can be two types of input signals: one being AC voltages and another varying over time due to load changes such as fluctuations caused by different loads connected across them. These variations affect how much current they produce when supplied at their usual level. This results in unwanted electrical pulses that interfere with proper functioning of electronic devices like computers and servers. To address these concerns, various techniques have been developed including feed forward controllers, negative feedback loops, and closed loop controls.
Method used
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[0018] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the following description is exemplary only and is not intended to limit the present invention. Also, in the following description, the same reference numerals will be used to designate the same or similar components in different drawings. Different features in different embodiments described below can be combined with each other to form other embodiments within the scope of the present invention.
[0019] figure 1 A schematic circuit diagram of an LLC resonant converter according to an embodiment of the present invention is shown. Such as figure 1 As shown, the LLC resonant converter 100 includes a main converter 110 and a controller 120 . The main converter 110 includes a half-bridge or full-bridge chopper having a drive circuit 112 , an inductor-capacitor series resonant network, an isolation transformer, and a rectification an...
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The invention discloses an LLC resonant converter and a method for suppressing a ripple in an output voltage thereof. The converter comprises a main converter, a feedforward controller and a controlled oscillator, wherein the main converter comprises a half-bridge or full-bridge chopper, an inductor-capacitor series resonant network, an isolation transformer and a rectification filtering circuit which are sequentially connected, the half-bridge or full-bridge chopper is provided with a driving circuit, the feedforward controller is used for generating a feedforward signal by using an input voltage, the controlled oscillator is used for receiving the feedforward signal from the feedward controller and controlling the working frequency of the chopper by the driving circuit according to the feedforward signal. Therefore, feedfoward correction is provided for the LLC resonant converter so as to reduce the ripple in the DC output voltage of the LLC resonant converter.
Description
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