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Double-loop voltage type PFM (Pulse Frequency Modulation) control method for single-inductor double-output switch transformer and device for double-loop voltage type PFM control method

A single-inductance dual-output, switching converter technology, applied in the direction of conversion equipment without intermediate conversion to AC, can solve the problems of easy instability of the converter, cross-effect of converter output branches, and failure to work normally, and achieve instantaneous The effect of high dynamic response performance, small cross influence and short adjustment time

Active Publication Date: 2015-05-20
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the traditional PFM technology is directly applied to a single-inductor dual-output switching converter, due to the existence of two output branches and multiple switching tubes in the converter, the cross-effect between the output branches of the converter is serious, and the switching power is changed when the load jumps. The device is prone to instability and cannot work normally

Method used

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  • Double-loop voltage type PFM (Pulse Frequency Modulation) control method for single-inductor double-output switch transformer and device for double-loop voltage type PFM control method
  • Double-loop voltage type PFM (Pulse Frequency Modulation) control method for single-inductor double-output switch transformer and device for double-loop voltage type PFM control method
  • Double-loop voltage type PFM (Pulse Frequency Modulation) control method for single-inductor double-output switch transformer and device for double-loop voltage type PFM control method

Examples

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Embodiment 1

[0030] figure 1 It is shown that a specific embodiment of the present invention is: single-inductance double-output switching converter double-loop voltage-type PFM control method and its device, the device is mainly composed of the first voltage detection circuit VS1, the second voltage detection circuit VS2, the first The voltage controller VCM1, the second voltage controller VCM2, the first comparator CMP1, the second comparator CMP2, the subtractor SUB, the flip-flop RS, the conduction timer CT, the inverter NOR and the first driving circuit DR1, the second It is composed of the second drive circuit DR2 and the third drive circuit DR3. The first voltage detection circuit VS1 is used to detect the output voltage V oa The value of the second voltage detection circuit VS2 is used to detect the output voltage V ob The value; the first voltage controller VCM1 is used to obtain the voltage control signal Vc1 , the second voltage controller VCM2 is used to obtain the voltage co...

Embodiment 2

[0042] The present invention adopts the signal flowchart of embodiment two method also as figure 1 As shown, the implementation mode is basically the same as the first embodiment, the difference is that the voltage controller VCM in this embodiment does not have the error amplifier EA, and the voltage controller VCM only generates the reference voltage signal V ref device, the reference voltage signal V ref That is, the voltage control signal V c .

[0043] Figure 8 Shown: the first voltage controller VCM1 of this example is: the reference voltage V ref1 That is, the voltage control signal V c1 ; The second voltage controller VCM2 of this example is: reference voltage V ref2 That is, the voltage control signal V c2 . Embodiment Three

Embodiment 3

[0044] like Figure 9 As shown, the third 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 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 double-loop voltage type PFM (Pulse Frequency Modulation) control method for a single-inductor double-output switch transformer and a device for the double-loop voltage type PFM control method. A voltage type frequency conversion control technology is adopted for controlling a main switching tube by an external loop; a fixed-on or off time voltage type frequency conversion control technology is adopted for controlling output branch circuit switching tubes by an internal loop, thereby independently regulating each output branch circuit. The method and the device can be used for controlling various transformers of a single-inductor double-output topological structure, such as a Buck transformer, a Boost transformer, a Buck-boost transformer and a Bipolar transformer, and compared with a conventional voltage type PWM control method and device for the single-inductor double-output switch transformer, the method and the device have the advantages of low output voltage ripple, high steady-state performance, quick input transient response and load transient response, little cross influence among the output branch circuits of the transformer, 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] With the widespread popularity of electronic products such as smart phones and tablet computers, users have higher and higher requirements for the size, load range and efficiency of power supplies for electronic products. Studies have shown that single-inductor dual-output switching converters can provide two independent power supplies for smart phones, tablet computers and other electronic products, reduce the number of inductors and control chips, effectively reduce the size of the power supply, reduce power supply costs, and improve conversion efficiency , thus attracting more and more attention from academia and industry. For the same single-inductor dual-output switching converter, different control methods make the converter have different transient and steady-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10
CPCH02M3/10
Inventor 周国华周述晗王瑶陈兴
Owner SOUTHWEST JIAOTONG UNIV
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