Resonant power converter and frequency tracking method thereof
A technology of power converter and frequency tracking, which is applied in the direction of converting AC power input to DC power output, DC power input to DC power output, irreversible DC power input to AC power output, etc., which can solve the problem of inability to judge resonance Problems such as the resonance state of the power converter and the inability to obtain the primary current of the resonance network
Active Publication Date: 2017-11-10
HUAWEI TECH CO LTD
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Problems solved by technology
However, the resonant power converter based on secondary current sampling cannot obtain the primary current of the resonant network, so the resonant state of the resonant power converter cannot be judged by the existing method
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[0076] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them.
[0077] The technology described in the embodiment of the present invention is mainly used in the LLC resonant power converter, and the LLC resonant power converter provided in the embodiment of the present invention is a control circuit with an open-loop structure, wherein the open-loop structure refers to the control circuit that does not control The results are fed back to affect the structure of the current control.
[0078] In order to judge whether the LLC resonant power converter is working in figure 1 The resonant frequency point, the first region, the second region or the third region, in the prior art, it is used to detect the phase difference between the pri...
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The embodiment of the invention provides a resonant power converter and a frequency tracking method thereof, and relates to the field of communication. Secondary side current is sampled; the resonant state of the resonant power converter is judged, so that the frequency of a driving signal is controlled; and thus, the purpose of tracking the resonant frequency of the resonant power converter through the frequency of the driving signal is achieved. The resonant power converter comprises an inverter branch, a resonant branch, a transformer, a rectifier filter branch, a detection branch, a judgment branch and a control branch; the resonant branch is connected with the inverter branch; the transformer is connected with the resonant branch; the rectifier filter branch is connected with the transformer, wherein the original end of the transformer is connected with the resonant branch; the auxiliary end of the transformer is connected with the rectifier filter branch; the detection branch is connected with both the auxiliary end of the transformer and the rectifier filter branch; the judgement branch is connected with the detection branch; and the control branch is connected with both the judgement branch and the inverter branch.
Description
technical field [0001] The invention relates to the communication field, in particular to a resonant power converter and a frequency tracking method thereof. Background technique [0002] The resonant power converter is a power electronic conversion device based on soft switching technology. With the birth of high-frequency switching devices, the resonant power converter is developing in the direction of high frequency, integration and modularization. Among them, soft switching is a switching process using soft switching technology. The ideal soft switching process is that the current or voltage drops to zero first, and then the current or voltage gradually rises to the rated value, so the switching loss is approximately zero, so that the power converter can be realized of high frequency. Commonly used soft switches include: ZVS (Zero Voltage Switching, zero voltage switching), ZCS (Zero Current Switching, zero current switching), ZCT (Zero Current Transition, zero current ...
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IPC IPC(8): H02M3/335H02M7/48
CPCH02M3/335H02M7/48H02M7/4815H02M3/01H02M3/33573H02M3/33571Y02B70/10H02M3/158H02M1/007H02M7/487H02M1/0095H02M1/0025H02M1/0009H02M1/08
Inventor 刘策武志贤
Owner HUAWEI TECH CO LTD