A dc-dc switching power supply with improved control mode
A technology of switching power supply and control mode, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc., which can solve the problems of reduced efficiency, increased duty cycle, high frequency, etc., to solve limitations, improve flexibility, and improve The effect of stability
Active Publication Date: 2020-06-26
上海芯导电子科技股份有限公司
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Problems solved by technology
[0003] The response speed of COT mode is very fast, but the maximum duty cycle is limited due to the fixed on-time. If the main switch on-time (TON) is set too large, it will easily cause large ripples in light-load mode; FOT The on-time of the mode will be lengthened as the load increases to increase the duty cycle. The disadvantage is that the fixed off-time cannot be set too low. high, less efficient
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[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0046] It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.
[0047] The following further describes the present invention in combination with the drawings and specific embodiments, but it is not a limitation of the present invention.
[0048] Refer to figure 1 , A DC-DC switching power supply with improved control mode, including,
[00...
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The present invention relates to the technical field of switching power supplies, in particular to a DC-DC switching power supply with an improved control mode, comprising: an input voltage terminal; an output voltage terminal; through the input voltage terminal and a first reference node; the second switch branch is controllably connected to the first reference node and the ground terminal under the action of a second driving signal; the PWM signal generating unit is used for the output pulse of a comparator Under the action of the signal, a PWM signal with adaptive adjustment of on-time and off-time is generated; the signal driving unit is used to process the signal output by the PWM signal generating unit to generate the first driving signal and the second driving signal. The invention allows the switch on time and off time to be adaptively changed, can improve the efficiency and stability of the switch circuit, can flexibly set the maximum duty cycle, and solve the problem of constant on time mode and fixed off in the prior art Time mode limitations.
Description
Technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a DC-DC switching power supply. Background technique [0002] The DC-DC switching power supply has a variety of control modes. According to the sampling signal, it can generally be divided into voltage mode and current mode. Voltage mode performs negative feedback by sampling output voltage, current mode performs negative feedback by sampling input current and output voltage; common current mode architectures include: Peak-Current Mode, Average-Current Mode and Hysteresis Current mode (Hysteretic-Current Mode); According to the duty cycle modulation method, it includes pulse width modulation (Pulse Width Modulation, PWM), pulse frequency modulation (Pulse Frequency Modulation, PFM), and constant on time mode (Constant OnTime, COT) , Fixed off time mode (Fixed OffTime, FOT), hysteresis control (Bang-Bang) and other modes. [0003] The COT mode has a fast response speed...
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IPC IPC(8): H02M3/156H02M1/14
CPCH02M1/14H02M3/156H02M3/1566
Inventor 符志岗肖晗朱同祥尹辉欧新华袁琼陈敏刘宗金郑朝晖
Owner 上海芯导电子科技股份有限公司