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Control circuit of buck converter and server

A control circuit and converter technology, applied in the control/regulation system, DC power input conversion to DC power output, instruments, etc., can solve the problem that the BUCK converter cannot accurately close the lower MOS, etc., to reduce voltage loss and improve efficiency effect

Active Publication Date: 2021-06-04
INSPUR SUZHOU INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above method can only turn off the lower MOS at a specific output voltage, and cannot accurately turn off the lower MOS in a buck converter with a wide output voltage range.

Method used

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  • Control circuit of buck converter and server
  • Control circuit of buck converter and server
  • Control circuit of buck converter and server

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Embodiment Construction

[0046] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0047] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

[0048] According to one aspect of the present invention, an embodiment of the present invention proposes a control circuit for a buck converter, such as figure 1 shown, which can include:

[0049] The first triode Q1, the base stage of the first t...

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PUM

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Abstract

The invention discloses a control circuit of a buck converter. The control circuit comprises three triodes, seven resistors and a comparator. The invention further discloses a server. According to the scheme provided by the invention, the controller in the buck converter can be controlled to output the signal for turning off the lower MOS tube under the condition that the phase voltage of the buck converter is changed, so that the signal can control the turn-off of the lower MOS tube just when the current is reverse after being transmitted through a line; the accurate reflux detection function can reduce the voltage loss of the buck converter, thereby improving the standby or light load efficiency of the system.

Description

technical field [0001] The invention relates to the field of step-down converters, in particular to a control circuit and a server of the step-down converter. Background technique [0002] In the DCM mode (Discontinuous Current Mode, discontinuous current mode), the inductor current of the synchronous BUCK converter will be less than zero. The function of the reverse current detection circuit is to detect the real-time magnitude of the inductor current, and when the inductor current is equal to zero, output a detection signal to turn off the lower MOS, so as to ensure that the inductor current will not flow backward. [0003] If the MOS is turned off early ( figure 2 Q in 下 ), the current continues to flow through the body diode of the lower MOS during the rest of the time, resulting in increased losses. The delayed turn-off of the MOS will cause the reverse flow of the inductor current, which will reduce the efficiency of the BUCK converter. Therefore, the accuracy of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M3/158
CPCH02M1/08H02M3/158Y02B70/10H02M1/0048
Inventor 冯子秋
Owner INSPUR SUZHOU INTELLIGENT TECH CO LTD