Method and device for controlling half-hysteresis ring pulse sequences of switching power supply in continuous working mode

A switching power supply, working mode technology, applied in output power conversion devices, control/regulation systems, electrical components, etc. large and other problems, to achieve the effect of suppressing low-frequency fluctuations, broadening the scope of application, and overcoming the complexity of detection and processing feedback

Inactive Publication Date: 2013-08-07
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the pulse sequence control switching converter works in the inductor current continuous mode (CCM), because the pulse sequence controller indirectly adjusts the output voltage by adjusting the inductor current, the controller has a hysteresis in the adjustment of the output voltage, resulting in the switching converter. Low-frequency fluctuation phenomenon, steady-state and transient performance deterioration
The current research shows that by increasing the equivalent series resistance (ESR) of the output filter capacitor, the low-frequency fluctuation phenomenon of the pulse sequence control continuous operation mode switching converter can be suppressed, but increasing the equivalent series resistance of the output filter capacitor will make the output voltage Ripple increases

Method used

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  • Method and device for controlling half-hysteresis ring pulse sequences of switching power supply in continuous working mode
  • Method and device for controlling half-hysteresis ring pulse sequences of switching power supply in continuous working mode
  • Method and device for controlling half-hysteresis ring pulse sequences of switching power supply in continuous working mode

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Embodiment 1

[0042] figure 1 It is shown that a specific embodiment of the present invention is a control method of a switching power supply, and its specific method is:

[0043] At the beginning of each switching cycle, the controller according to the output voltage V of the switching converter TD o with reference voltage V ref The relationship between selects the effective control pulse in the switching period, so as to realize the control of the switching converter TD. Its control pulse selection rule is: if V o below V ref , using the control pulse P H Control the switching tube S in the switching converter; on the contrary, if V o higher than V ref , using the control pulse P L Control switch tube S.

[0044] The controller generates a control pulse P H The method is: at the beginning of a certain switching cycle t 0 time, the one-shot timer starts counting, and the control pulse P H From low level to high level, the switch tube S in the converter TD is turned on, and the i...

Embodiment 2

[0061] Figure 8 It is shown that this example is basically the same as the first example, except that the converter TD of the switching power supply controlled by this example is a Boost converter.

Embodiment 3

[0063] Figure 9 It is shown that this example is basically the same as the first example, except that the converter TD of the switching power supply controlled by this example is a Buck-Boost converter.

[0064] The method of the present invention can be realized with analog device or digital device conveniently; Except the switching power supply that can be used for the converter in the above embodiment to form, also can be used for Cuk converter, BIFRED converter, flyback converter, half-bridge converter , full-bridge converter and other power circuits to form a switching power supply.

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Abstract

The invention discloses a method and a device for controlling half-hysteresis ring pulse sequences of a switching power supply in a continuous working mode. The method includes that in each starting moment of a switching period, effective control pulses within the switching period are selected according to relationship between switching converter Vo (voltage output) and Vref (voltage reference). Selection rules include that a control pulse PH is adopted to control a switching tube S of a switching converter if the Vo is lower than the Vref; and if not, a control pulse PL is adopted to control the switching tube S. High-electrical level lasting time of each control pulse is a preset fixed value, and low-electrical level lasting time of each control pulse is acquired by comparison of inductive current IL and preset estimated current IV. The method for controlling the half-hysteresis ring sequences can be used for controlling a high-power switching converter in the continuous working mode; a control technology in the method is simple and practical; and the switching converter has strong stability and capacity of resisting disturbances and good dynamic performance, and is applicable to the switching converters with various topological structures.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a control method and device for a switching converter. Background technique [0002] A switching power supply is a power supply that maintains a stable output voltage by controlling the turn-on and turn-off time of the main power switch. It has the advantages of low power consumption, high power conversion efficiency, small size, wide voltage regulation range, etc., and is widely used in various electronic products. With the development of power electronics technology and the popularization of battery-powered portable electronic devices, the performance requirements of switching power supplies are getting higher and higher. In order to improve the shortcomings of traditional pulse width modulation (PWM) technology, such as slow transient response speed and difficult compensation network design, some new control methods have been proposed in recent years to improve the performance of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/157
Inventor 许建平沙金王金平刘姝晗
Owner SOUTHWEST JIAOTONG UNIV
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