Frequency conversion control method of independent charging and discharging timing sequence single-inductance double-output switching converter and frequency conversion control device

A single-inductance dual-output switching converter technology, which is applied to output power conversion devices, conversion equipment without intermediate conversion to AC, electrical components, etc., can solve the problems affecting the improvement of converter efficiency, low converter conversion efficiency, The converter loses stability and other problems, and achieves the effect of wide load range, high transient response performance, and short adjustment time

Active Publication Date: 2017-01-04
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Independent charging and discharging sequence single-inductance dual-output switching converter works in DCM, which eliminates the cross influence of the output branch, but the conversion efficiency of the converter is low, the inductor current ripple is large, and the load capacity is poor; when it works in PCCM, it overcomes the The disadvantage of large inductor current ripple is eliminated, but additional switching loss and conduction loss are introduced during the freewheeling switch working stage, which affects the improvement of converter efficiency; when working in CCM, the inductor current and output voltage ripple are small , The converter has high efficiency and strong load capacity, but the cross influence between the output branches is serious
Constant-frequency control technology based on pulse width modulation (PWM) is the most common control method for single-inductance dual-output switching converters. In CCM, if the branch load is unbalanced, the converter will lose stability and cannot work normally

Method used

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  • Frequency conversion control method of independent charging and discharging timing sequence single-inductance double-output switching converter and frequency conversion control device
  • Frequency conversion control method of independent charging and discharging timing sequence single-inductance double-output switching converter and frequency conversion control device
  • Frequency conversion control method of independent charging and discharging timing sequence single-inductance double-output switching converter and frequency conversion control device

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Embodiment 1

[0027] figure 1 It is shown that a specific embodiment of the present invention is: independent charging and discharging sequential single-inductance dual-output switching converter frequency conversion control method and its device, the device is mainly composed of the first current detection circuit IS1, the second current detection circuit IS2, the second A voltage detection circuit VS1, a second voltage detection circuit VS2, an adder ADD, a first error amplifier EA1, a second error amplifier EA2, a first pulse generator PGR, a second pulse generator PGS, a first flip-flop RS, a second Two flip-flops D, the first drive circuit DR1, the second drive circuit DR2 and the third drive circuit DR3 are composed; in each switching cycle, the capacitive currents of the two branches are detected to obtain the signal i c1 and i c2 , detect the output voltage of the two branches, and get the signal V oa and V ob ; will i C1 and i C2 Send to the adder ADD to generate signal i C ;...

Embodiment 2

[0044] Such as Figure 9 As shown, the second embodiment of the present invention is basically the same as the first embodiment, except that the converter TD controlled in this example is a single-inductance dual-output Boost converter.

[0045] In addition to the switching converters in the above embodiments, the present invention can also be used in various multi-output circuit topologies such as single-inductor dual-output Buck-Boost converters and single-inductor dual-output Bioplor converters.

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Abstract

The invention discloses a frequency conversion control method of an independent charging and discharging timing sequence single-inductance double-output switching converter and a frequency conversion control device. Control on a main switch tube and a branch switch tube of the converter is finished through limiting the amplitudes of a capacitive current peak and a capacitive current valley, and independent adjustment on various output branches is achieved. Compared with a traditional independent charging and discharging timing sequence single-inductance double-output switching converter, the independent charging and discharging timing sequence single-inductance double-output switching converter disclosed by the invention has the advantages of being good in stability, high in reliability, wide in load range, high in anti-jamming capability, high in input and load transient response speeds, small in cross influence among the output branches and the like, and can be used for controlling various converters, such as a Buck converter, a Boost converter, a Buck-boost converter, a Bipolar converter and the like, with a single-inductance double-output topological structure.

Description

technical field [0001] The invention relates to power electronic equipment, in particular to a control method and device for a single-inductance double-output switching converter. Background technique [0002] With the popularity of smart mobile devices, switching power supplies are developing towards high reliability, small size, low cost, and multiple outputs. Single-inductor multiple-output switching converters have attracted much attention from academia and industry because they only need one inductor, which greatly reduces the number of magnetic cores required for multiple output systems and lowers the cost. However, since each output branch of the single-inductor multi-output switching converter shares an inductor, the output branches are coupled together through the inductor. When the load of one output branch changes, the inductor current will affect the output of other output branches. output, thus causing cross effects. When the crossover effect is light, it will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10H02M1/14
CPCH02M1/14H02M3/10H02M1/0003H02M1/009
Inventor 周国华周述晗刘啸天冷敏瑞
Owner SOUTHWEST JIAOTONG UNIV
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