Charging control circuit and system for bootstrap capacitor
A bootstrap capacitor and charging control technology, applied in battery circuit devices, circuit devices, collectors, etc., can solve problems such as energy loss, reduced power conversion efficiency, and low capacitor voltage, so as to reduce energy loss and improve power conversion efficiency , Reduce the effect of conduction times
Inactive Publication Date: 2019-05-10
INSPUR BUSINESS MACHINE CO LTD
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Problems solved by technology
[0003] However, due to the insufficient charge storage of the bootstrap capacitor or the low voltage of the long-term power-off charge loss capacitor, it cannot provide an effective boost for the gate set. Therefore, when the load is in the COT (constant on-time) light load mode, the existing The technology will turn on the lower MOS tube to charge the bootstrap capacitor in each cycle to ensure that the bootstrap capacitor has enough charge storage, but because the lower MOS tube will generate heat, frequent turning on the lower MOS tube will cause energy loss, reducing power conversion efficiency
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Embodiment Construction
[0022] The embodiment of the present invention provides a charging control circuit and system for a bootstrap capacitor, which can reduce the conduction times of the second MOS transistor during use, thereby reducing energy loss and improving power conversion efficiency.
[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.
[0024] Please refer to figure 1 , figure 1 A structural block diagra...
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The invention provides a charging control circuit and system for a bootstrap capacitor. The circuit comprises a logic control unit, a first MOS transistor, a second MOS transistor, a bootstrap capacitor, a voltage detecting circuit, and a load circuit, wherein the voltage detecting circuit is configured to detect voltages across the bootstrap capacitor and output a control signal when the voltagesdecrease to a preset threshold; and the logic control unit is configured to control the second MOS transistor to be turned on according to the control signal. The voltage detecting circuit is used todetect the voltages across the bootstrap capacitor in real time, and only when the voltages across the bootstrap capacitor drop to a preset threshold, the voltage detecting circuit outputs a controlsignal to the logic control unit, and the logic control unit controls the second MOS transistor to be turned on according to the control signal, thereby charging the bootstrap capacitor to make the voltages across the bootstrap capacitor increase. In the use of the application, the number of times of conduction of the second MOS tube can be reduced, thereby reducing energy loss and improving powerconversion efficiency.
Description
technical field [0001] Embodiments of the present invention and the technical field of server equipment, in particular, relate to a charging control circuit and system for a bootstrap capacitor. Background technique [0002] At present, the voltage adjustment scheme applied to the server is mainly based on the Buck circuit. However, the Buck circuit can maintain normal operation because the upper and lower MOS transistors can be turned on alternately. When the upper MOS transistor is turned on normally, certain conditions must be met (i.e. >Vgs(th)), where Vgs is the voltage applied across the gate and source, and Vgs(th) is the critical turn-on voltage of the gate and source voltage. Limited to the voltage limit in the circuit, in actual application, the voltage that can be connected to the gate is 5V, the input voltage of the drain is 12V, and the source voltage is 0 when the upper MOS transistor is not turned on. Considering the conduction of the upper MOS transistor ...
Claims
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Inventor蔡文波康磊
OwnerINSPUR BUSINESS MACHINE CO LTD