Frequency conversion control method and device for single-inductor dual-output switch converter in continuous conduction mode

A single-inductor dual-output, switching converter technology, applied in the output power conversion device, the conversion equipment without intermediate conversion to AC, the conversion of DC power input to DC power output and other directions, can solve the problem of small load capacity current ripple. , The converter loses stability and cannot work normally, etc., to achieve the effect of small cross influence, high transient response performance and high reliability

Active Publication Date: 2015-05-27
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Single-inductor dual-output switching converters with independent charging and discharging usually work in the inductor current discontinuous conduction mode (DCM), which has the advantages of simple control and small cross-effects between output branches, but when the converter works in DCM mode The conversion efficiency is low, the current ripple is large, and the load capacity is poor
When the independent charge-discharge single-inductor dual-output switching converter works in the continuous conduction mode (CCM) of the inductor current, it has strong load capacity and small current ripple, but there is a certain cross-effect in the output branch
The control technology based on pulse width modulation (PWM) is the most common constant-frequency control method for single-inductance dual-output switching converters. However, independent charge-discharge single-inductance dual-output switching converters using constant frequency In CCM, if the branch load or input voltage jumps, the converter will lose stability and cannot work normally

Method used

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  • Frequency conversion control method and device for single-inductor dual-output switch converter in continuous conduction mode
  • Frequency conversion control method and device for single-inductor dual-output switch converter in continuous conduction mode
  • Frequency conversion control method and device for single-inductor dual-output switch converter in continuous conduction mode

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Embodiment 1

[0029] figure 1 It is shown that a specific embodiment of the present invention is: a continuous conduction mode single-inductance dual-output switching converter frequency conversion control method and its device, the device is mainly composed of the first voltage detection circuit VS1, the second voltage detection circuit VS2, the current detection Circuit IS, first error amplifier EA1, second error amplifier EA2, first pulse generator PGR, second pulse generator PGS, first flip-flop RS, second flip-flop D, first drive circuit DR1, second drive The circuit DR2 and the third drive circuit DR3 are composed; in each switching cycle, the inductor current is detected to obtain the signal i L , detect the output voltage of the two branches, and get the signal V oa and V ob ; set V oa and voltage reference V ref1 sent to the first error amplifier EA1 to generate signal i p1 ; set V ob and voltage reference V ref2 sent to the second error amplifier EA2 to generate signal i p...

Embodiment 2

[0043] 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.

[0044] In addition to the switching converters in the above embodiments, the method of 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 and device for a single-inductor dual-output switch converter in a continuous conduction mode. By limiting inductive current peak and valley, the control on a main switch tube and branch switch tubes in the converter is finished and independent adjustment of each output branch is realized. Compared with a conventional single-inductor dual-output switch converter working in a continuous conduction mode, the frequency conversion control method and device have the advantages of good stability, high reliability, strong anti-jamming capability, high input or load transient response speed, little cross influence of the output branches and the like, and can be used for controlling various converters with single-inductor dual-output topological structures, such as a Buck converter, a Boost converter, a Buck-boost converter, a Bipolar converter and the like.

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] Single-inductor dual-output switching converters can provide two independent power supplies for battery-powered portable electronic products, and have the advantages of low power consumption, high efficiency, small size, and low cost, and have been used more and more in the industry . As users have higher and higher performance requirements for single-inductance dual-output switching converters, in recent years, according to different operating modes, some new single-inductance dual-output switching converter control methods have been proposed to solve the transient problems of traditional control technologies. There are many problems such as slow state response and serious cross influence between output branches. [0003] The working sequence of single-inductor dual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/06H02M3/08
CPCH02M3/1584H02M1/0067H02M1/009
Inventor 周国华周述晗张凯暾李振华
Owner SOUTHWEST JIAOTONG UNIV
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