A Method of Improving Load Transient Response of Single Inductor Multiple Output Power Converter

A single-inductance multi-output, power converter technology, applied in the field of microelectronics, can solve problems such as complex bandwidth, achieve fast response, accurate steady-state adjustment, and avoid instability

Active Publication Date: 2018-03-20
SOUTHEAST UNIV
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Problems solved by technology

In theory, increasing the switching frequency can increase the bandwidth of power converters with traditional voltage mode control, but parasitic effects and robustness make it very complicated to obtain bandwidths above 1MHz

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  • A Method of Improving Load Transient Response of Single Inductor Multiple Output Power Converter
  • A Method of Improving Load Transient Response of Single Inductor Multiple Output Power Converter
  • A Method of Improving Load Transient Response of Single Inductor Multiple Output Power Converter

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Embodiment Construction

[0013] Such as figure 1 It shows that when the load current suddenly increases, the load current I o , Inductor current I L and the output voltage V out waveform. It can be seen from the figure that without affecting the characteristics of the DC-DC converter itself, the best way to improve the transient response is to minimize t 1 to t 2 The overshoot delay time Δt {1,2} . Since the moment when the load mutation occurs is uncertain, Δt {1,2} The value of is not fixed, it is mainly composed of two parts: one is the switch off time t of the normal switching cycle off , the second is the delay time Δt of the control circuit d , that is, the time required from when the load change feedback enters the control circuit to when the duty ratio signal is generated. t off Ideally, it can be reduced to zero. By directly detecting the load current, the present invention promptly reflects the change of any load current to the control circuit of each branch of the secondary loop a...

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Abstract

The invention discloses a method for improving the load transient response of a single-inductor multi-output power converter. On the basis of a traditional single-inductance multi-output power converter, a load current sampling network is additionally arranged between the source electrode and the drain electrode of a secondary power switch tube in each output branch, the change of current on each output branch switch tube can be directly detected to embody the change of load current, and the current change on the output branch switch tube is taken as feedforward current to timely reflect the change of any path of load current to a control circuit of each branch of a secondary ring. A duty cycle is quickly regulated, quick response is realized, the ripple wave of output voltage is reduced, and the instability of the system is avoided.

Description

technical field [0001] The invention relates to a single-inductance multi-output switching power converter, in particular to a method for improving the load transient response of the single-inductance multi-output power converter, which belongs to the field of microelectronics. Background technique [0002] Single-Inductor Multiple-output (SIMO) switching power supply converter is a new type of multi-output switching converter structure. Using the time-sharing working principle of each output branch, only one inductor can independently control multiple power supplies. The output is suitable for the power supply of multi-value voltage system. Each output branch shares an inductance and works in time-sharing, which greatly reduces the number of inductances required by the circuit. Therefore, while realizing independent and precise control of each output branch, the size of the converter system is greatly reduced. However, as the operating frequency and integration of micropro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02M1/14
CPCH02M1/143H02M3/1584
Inventor 孙伟锋薛尚嵘张玉浩宋慧滨李杰祝靖陆生礼时龙兴
Owner SOUTHEAST UNIV
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