Dynamic transient control in resonant converters
A converter and resonant stage technology, applied in the field of dynamic transient control, can solve problems such as poor response, inability to completely suppress voltage transients, and poor converter transient response.
Pending Publication Date: 2021-04-16
MURATA MFG CO LTD
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Problems solved by technology
Converters with limited regulation capabilities may not be able to fully suppress voltage transients if the load on the converter is reduced at the moment when the input voltage supplied by the PFC stage is at its peak
[0004] If the converter uses a known proportional-integral (PI) controller, the transient response of the converter may be poor, resulting in an output voltage overshoot of up to 1V during the heavy-to-light load transient response
Because this response can be poor, known converters may require droop sharing instead of active sharing to meet load transients for 100% to 60% and for 60% to 10% load transient requirement
[0005] This issue is specific to frequency-controlled topologies, which have difficulty meeting transient response requirements due to limitations on the maximum switching frequency at which the converter can safely operate
Method used
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Embodiment Construction
[0021] figure 1 A half-bridge LLC converter with a single resonant capacitor C is shown. The converter includes a primary side and a secondary side. The primary side is the side of the converter between the terminals PFC V+, PFC V- and the transformer T. The secondary side is the converter located at the transformer T and the output terminal V out One side between + and -. A PFC stage (not shown) provides a DC input to the converter at terminals PFC V+, PFC V-.
[0022] The primary circuit consists of: primary switch Q 1 , Q 2 ; Resonant inductor L r ; resonant capacitor C; and inductor L m . Primary switch Q 1 , Q 2 Defines the switching stage and is connected to terminals PFC V+, PFC V-. Resonant inductor L r , resonant capacitor C and inductor L m Define the resonance level. Resonant inductor L r and resonant capacitor C are connected in series with each other and between the primary winding of transformer T and the primary switch Q 1 , Q 2 between the nod...
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A converter includes a switching stage including first and second primary transistors; a resonant stage connected to the switching stage; a transformer including a primary winding connected to the resonant stage; a rectifying stage connected to a secondary winding of the transformer and including first and second synchronous rectifiers; and a controller. The controller is configured and / or programmed to operate in a steady-state mode in which an output voltage of the converter is regulated by varying a switching frequency of the first and second primary transistors and of the first and second synchronous rectifiers; and a synchronous-rectification control mode in which the output voltage is regulated when an output-voltage overshoot is detected by switching the first and second primary transistors and the first and second synchronous rectifiers at a fixed switching frequency and by varying a duty cycle of the first and second synchronous rectifiers.
Description
technical field [0001] The present invention relates to DC / DC converters. More specifically, the present invention relates to dynamic transient control in resonant converters. Background technique [0002] Figure 1 to Figure 3 An LLC converter is shown. Figure 1 to Figure 3 The circuit shown in can be used with known converters as well as with converters according to preferred embodiments of the invention. such as Figure 1 to Figure 3 The dynamic performance of known LLC converters, such as that shown in , may be unsatisfactory due to power train limitations. For example, a full-bridge LLC converter may be limited in its switching frequency range with a maximum switching frequency of 200 kHz to maintain full zero voltage switching (ZVS) operation under all conditions. However, the converter's transient response capability weakens during heavy-to-light-load transients, when significant output voltage overshoot can be noticed. That is, when the converter goes from heavy ...
Claims
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IPC IPC(8): H02M3/335H02M1/08
CPCY02B70/10H02M3/33592H02M3/33573H02M3/01H02M1/0058H02M1/08
Inventor 鲁宾尼奇·姚克绍
Owner MURATA MFG CO LTD