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Single inductor dual output switch converter frequency conversion control method and device

A single-inductance dual-output switching converter technology, which is applied to output power conversion devices, conversion equipment with intermediate conversion to AC, and conversion equipment without intermediate conversion to AC, can solve the characteristics of PCCM switching converters. Low converter efficiency and other problems, to achieve the effect of improving light load efficiency, short adjustment time, and small cross-effect

Active Publication Date: 2016-12-21
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the control of the freewheeling switch also has a great influence on the characteristics of the PCCM switching converter
The freewheeling control of the traditional PCCM switching converter adopts the constant-reference-current control (constant-reference-current, CRC) method, which has low converter efficiency under light load conditions

Method used

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  • Single inductor dual output switch converter frequency conversion control method and device
  • Single inductor dual output switch converter frequency conversion control method and device
  • Single inductor dual output switch converter frequency conversion control method and device

Examples

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Embodiment 1

[0031] figure 1 As shown, a specific embodiment of the present invention is: a mixed conduction mode single-inductance dual-output switching converter frequency conversion control device, mainly composed of the first voltage detection circuit VS1, the second voltage detection circuit VS2, the current detection circuit IS, the first Error amplifier EA1, second error amplifier EA2, first pulse signal generator PGS, second pulse signal generator PGR, first flip-flop RS1, second flip-flop RS2, first OR gate OR1, second OR gate OR2, The first conduction timer TON1, the second conduction timer TON2, the NOT gate, the AND gate AND, the first drive circuit DR1, the second drive circuit DR2, the third drive circuit DR3 and the fourth drive circuit DR4; In each switching cycle, the inductor current is detected to obtain the signal I L , detect the output voltage of the two output branches to get the signal V oa and V ob ; set V oa and voltage reference V ref1 sent to the first erro...

Embodiment 2

[0048] like Figure 11 As shown, this example is basically the same as the first example, except that the converter TD controlled in this example is a mixed conduction mode single-inductance dual-output single-ended forward converter.

[0049] In addition to the single-inductance dual-output switching converters in the above embodiments, the present invention can also be used for multiple multi-output converters such as mixed conduction mode single-inductance dual-output half-bridge converters, mixed conduction mode single-inductance dual-output full-bridge converters, etc. in the circuit topology.

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PUM

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Abstract

The invention discloses a single inductor dual output switch converter frequency conversion control method and device. Based on output voltage and inductive current information, a frequency conversion method is adopted for controlling a main switching tube of a switch converter, the inductive current information is used for slope compensation, work stability can be ensured when equivalent series resistance of an output capacitor is low, turn-on and turn-off of a freewheeling switch tube can be indirectly controlled based on turn-off time of the fixed main switching tube in each switching period, dynamic freewheeling of induct currents can be realized, and independent adjustment of each output branch can be realized. A single inductor dual output switch converter of a mixed electric conduction mode is advantaged by good stability, small cross impact among output branches, high output and load transient responding speed, high efficiency and the like.

Description

technical field [0001] The invention relates to a control method and a device for a multi-channel output switch converter, belonging to the field of power electronic equipment, and in particular to a frequency conversion control method and a control device for a single-inductance double-output switch converter. Background technique [0002] The development of portable electronic products has put forward higher and higher requirements for multi-voltage output switching power supplies, making multi-output switching converters a focus of attention. Traditional multi-output switching converters have many magnetic components and are bulky, while single-inductor multi-output switching converters have the advantages of small system size, low cost, and independent adjustment of output branches. They are widely used in tablet computers, portable Information equipment, LED driver and other fields. [0003] Similar to the single-output switching converter, the single-inductor dual-out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/10H02M3/28
CPCH02M3/10H02M3/28H02M1/0003H02M1/009
Inventor 周国华冷敏瑞刘啸天周述晗
Owner SOUTHWEST JIAOTONG UNIV
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