Single-inductor multi-output DC-DC converter and control method thereof

A single-inductor multi-output, DC converter technology, applied in the field of electronics, can solve the problems that the duty cycles are not independent of each other, affect the normal operation of the system, and increase the voltage ripple, so as to reduce mutual influence and reduce the cross-regulation rate. , the effect of loop response speed change

Active Publication Date: 2016-07-20
拓尔微电子股份有限公司
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Problems solved by technology

However, this control method also has disadvantages. Since each channel shares the same inductor, and the duty cycle of each channel is not independent of each other, when the output load current of one of the channels changes, the average value of the inductor current and the The duty cycle of the channel will also change accordingly, and th

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Embodiment Construction

[0049] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0050] A single inductor multiple output DC-DC converter, including:

[0051] Single inductor multiple output DC-DC converter power stage for providing multiple outputs;

[0052] by figure 1 As an example, the figure includes a single-inductance four-output DC-DC converter power stage, the main components and functions are as follows: input voltage V in Provide energy to the entire system; power transistor G 1 ~G 7In the on or off state, it acts as a switch; the inductor L plays the role of energy storage and filtering; the output capacitor C 1 ~C 4 Used for filtering and energy storage; R o1 ~R o4 is the load resistance, and the output voltages are V o1 ~V o4 . in addition, figure 1 The current sampling circuit in the circuit samples the inductor current to realize the current mode control method, and the sampling current value is i s...

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Abstract

The invention discloses a single-inductor multi-output DC-DC converter and a control method thereof. The converter comprises a single-inductor multi-output DC-DC converter power stage, a current/voltage sampling circuit, a voltage analog-to-digital converter (ADC) module, an error signal generation module, a multi-path circuit proportional integral (PI) module, a duty ratio re-allocation module, a multi-path digital pulse width modulation module, a summator/subtracter, a current PI module, a digital pulse width modulation module, a new duty ratio total sum generation module, a switch logic and a dead zone control and driving circuit. By stretching and contracting an old duty ratio signal according to proportion to further control, and the cross regulation rate of the converter is reduced; meanwhile, the signal bit width is reduced by Sigma-Delta truncation during telescopic conversion, meanwhile, the precision is ensured, hardware calculation resources are saved, the calculation speed is increased, and the cost is reduced. The single-inductor multi-output DC-DC converter and the control method thereof can be widely applied to the technical field of electronics.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a single-inductance multi-output DC-DC converter and a control method thereof. Background technique [0002] Single-Inductor Multiple-output (Single-InductorMultiple-output, SIMO) DC-DC converter is a new topology of switching power supply. In this type of converter, each output channel shares the same inductance, thereby achieving the purpose of saving inductance, reducing the size of the converter, and saving costs. [0003] At present, there are mainly two charging and discharging schemes for single-inductor multi-output DC-DC converters: one is Time Multiplexing (TM) control method, that is, in one cycle, for each channel, the first Charge the inductor, and then the inductor discharges the channel. For an n-channel converter, the number of times the inductor is charged is n, and the number of times it is discharged is also n. The characteristic of this control method i...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1584H02M1/009
Inventor 郭建平陈彪郑彦祺祝磊陈弟虎
Owner 拓尔微电子股份有限公司
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