PID control circuit of DC-DC switching power supply

Abstract

The invention discloses a PID control circuit of a DC-DC switching power supply, which belongs to the technical field of switching power supplies. The control circuit comprises a time delay link, an error pulse generation link, an integral differential pulse generation link, a phase shift carrier generation link and a proportional integral differential pulse combination link. The output voltage ofthe power circuit is compared with a carrier wave to generate a pulse width signal, a control strategy is realized by a logical operation method, so that the signal in the control circuit is basically transmitted in a pulse form, and in comparison with analog control, the circuit is not easily influenced by device parameter drift, and the control effect is similar to digital control; and meanwhile, logic operation of pulse width in the circuit is simple and can be directly achieved through a logic gate, a digital processor does not need to be adopted, and in comparison with digital control, the cost is low.

Description

technical field [0001] The invention belongs to the field of switching power supplies, and more specifically relates to a PID control circuit of a DC-DC switching power supply. Background technique [0002] With the development of science and technology and the improvement of consumption level, more and more mobile devices are used in daily life, such as smart phones, laptops, tablets, mobile wearable devices, etc. Most of these mobile devices require DC power supply, so there is a great demand for DC power converters. Compared with linear power supplies, DC-DC switching power supplies have low loss, small size and high efficiency, and have been widely used. Controller design has a great relationship with the performance of DC-DC switching power supply, and also affects the design and manufacturing cost of DC-DC switching power supply to a certain extent, so it has important research value. [0003] The control of DC-DC switching power supply can be divided into analog con...

AI Technical Summary

Problems solved by technology

The disadvantage of analog control is that the device is greatly affected by the environment, and the parameter drift of the device will cause a large error in the circuit, and the control effect is relatively poor

Digital control is not affected by device parameter drift; while the price of digital processing chips is relatively high, especially the price of digital processing chips with high computing and storage requirements is very high compared to analog devices, so the cost of digital control is relatively high

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