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Switching power supply device

A technology of switching power supply and switching element, which is applied in the direction of output power conversion devices, electrical components, and adjusting electrical variables, which can solve the problems of insufficient phase margin and unstable operation.

Pending Publication Date: 2021-09-21
SANKEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not only impossible to suppress the output voltage fluctuation when the load suddenly changes as expected, but worst of all, there is a problem that the operation becomes unstable due to insufficient phase margin.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] figure 1 It is a circuit configuration diagram of the switching power supply device of the first embodiment. figure 1 The switching power supply device of Embodiment 1 shown has a voltage detection unit 1, a target value generation unit 2, a subtractor 3, a digital filter 4, a drive unit 5, a current detection unit 6, a filter characteristic analysis unit 7, and a constant storage unit. 8. High-side MOSFET 101 , low-side MOSFET 102 , inductor 103 , output capacitor 104 and output load 105 . The high-side MOSFET 101 and the low-side MOSFET 102 correspond to switching elements of the present invention.

[0035] The switching power supply device converts the first DC voltage supplied from the power supply Vi into the second DC voltage via the inductor 103 and the output capacitor 104 by turning on and off the high-side MOSFET 101 and the low-side MOSFET 102 alternately, and supplies the output voltage to the output voltage. The load 105 supplies the output voltage Vo.

...

Embodiment 2

[0081] Figure 9 It is a configuration diagram of the switching power supply device of the second embodiment. Compared with the first embodiment, the second embodiment has a constant calculation unit 9 instead of the constant storage unit 8 . The other configurations of the second embodiment are the same as those of the first embodiment, so only the constant calculation unit 9 will be described.

[0082] The constant calculation unit 9 is based on the filter characteristic analysis result (LC resonance frequency f 0 value), the target crossover frequency fca, the target phase margin PMa and other information required for setting, calculate the filter constant satisfying the condition, and apply the calculated filter constant to the digital filter 4 . An example of the calculation method in the constant calculation unit 9 will be described.

[0083] When it is assumed that the optimized filter characteristics satisfy fz 1 0 2 2 .

[0084] fz 2 ≒-fca·tan(PMa+90deg)-fz 1 ....

Embodiment 3

[0095] Figure 10 It is a configuration diagram of the switching power supply device of the third embodiment. In the switching power supply device of the third embodiment, an input voltage detection unit 10 is added to the switching power supply device of the second embodiment. In addition, the digital filter 4 is changed to a digital filter 4b. Figure 10 The other structures shown are the same as figure 1 The structures shown are the same, so only the different structures are described.

[0096] The input voltage detection unit 10 detects the input voltage Vi, and outputs the detected input voltage Vi as a digital value to the digital filter 4b. The digital filter 4 b outputs to the drive unit 5 an analysis signal that changes in accordance with the value of the input voltage Vi detected by the input voltage detection unit 10 during the filter characteristic analysis period Tr. The drive unit 5 controls the high-side MOSFET 101 and the low-side MOSFET 102 at a duty ratio...

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Abstract

The present invention is provided with: a voltage detection unit (1) for detecting an output voltage and converting the detected output voltage to a digital value having a predetermined number of bits; a digital filter (4) for performing a predetermined calculation on the basis of the error between a target value and the output of the voltage detection unit; a drive unit (5) for driving switching elements with a predetermined duty in a filter characteristic analysis period and controlling a main switching element with a duty based on the calculation result of the digital filter after the completion of the filter characteristic analysis period; a current detection unit 6 for detecting a current flowing through an inductor and outputting the detected current as a current detection signal; a filter characteristic analysis unit (7) for analyzing, on the basis of the current detection signal from the current detection unit, the characteristics of a filter constituted by the inductor and an output capacitor from the period of occurrence of a rush current flowing through the inductor in the filter analysis period; and a constant storage unit (8) having a plurality of digital filter constant tables in which a plurality of filter constants corresponding to a plurality of filter characteristics are stored, selecting a proper filter constant from among the plurality of digital filter constant tables in accordance with the filter characteristics after the completion of the filter characteristic analysis period, and supplying the selected filter constant to the digital filter.

Description

technical field [0001] The invention relates to a switching power supply device applied to a non-insulated step-down chopper circuit and the like. Background technique [0002] As a method of generating a stable voltage lower than an input voltage, a non-isolated step-down chopper circuit is widely used. In particular, POL (Point of Load: point of load) module power supplies are frequently used in communication infrastructure and the like. [0003] This module power supply has a control circuit, power MOSFET (Power MOSFET) and an inductor mounted on a single board. The user adds an output capacitor between the output terminal of the module and GND, and adjusts the value of the output capacitor. Thereby, the output ripple voltage accompanying the switching operation can be suppressed, and the fluctuation of the output voltage when the output load current fluctuates sharply can be adjusted to fall within the standard range. [0004] Generally speaking, the more you adjust t...

Claims

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Application Information

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IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 中村胜
Owner SANKEN ELECTRIC CO LTD
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