Inductive current estimation method for DC-DC switching power supply

Abstract

The invention discloses an inductive current estimation method for a DC-DC switching power supply. A voltage sampling module, a data conversion module, a switching signal counting module, an inductive voltage calculation module and a digital filter module are included. The input voltage and the output voltage pass through the voltage sampling module and the data conversion module to obtain converted input voltage and converted output voltage with the same digit; the node voltage is compared with the reference voltage, and then the duty ratio is obtained through the switching signal counting module; the inductance voltage calculation module outputs the average value of the voltages at the two ends of the inductance and the parasitic resistor, and the estimated inductance current is finally obtained through the digital filter module; the real-time inductive current can be accurately estimated under the condition that only input and output voltages are sampled, additional analog sampling circuits such as resistors, capacitors and operational amplifiers do not need to be added, a high-speed ADC far higher than the switching frequency is not needed, the cost can be reduced, the circuit size is reduced, and high universality is achieved.

Description

technical field [0001] The invention belongs to the field of switching power supplies, in particular to a method for estimating the inductance current of a DC-DC switching power supply. [0002] technical background [0003] With the continuous development of science and technology, a variety of electronic devices appear in people's lives, ranging from various portable and wearable electronic devices, such as mobile phones, smart watches, tablet computers, to automotive electronics, medical equipment, etc. improving people's lives. Consumer electronics are constantly iteratively updated, and their functions are becoming more and more powerful, which also requires electronic products to have a stable power supply system to maintain their normal work. At the same time, the size of electronic products is getting smaller and smaller. Before there is a breakthrough in battery technology, the power supply efficiency can only be improved through high-performance power management ch...

AI Technical Summary

Problems solved by technology

This is an obvious disadvantage for DC-DC switching power supplies with high switching frequency since the ADC requirements are very expensive

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