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A digital loop compensator for flyback switching power supply

A switching power supply, loop compensation technology, applied in the direction of instruments, electrical components, adjusting electrical variables, etc., can solve the problems of complex circuit design, difficult to modify, large number of components, etc., to improve response time, reduce overshoot, The effect of reducing errors

Inactive Publication Date: 2019-01-08
HARBIN UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

The controller has disadvantages such as complex circuit design, large number of components, control performance is easily affected by the environment, and it is difficult to modify the control circuit after it is formed, which brings obstacles to the integration and modularization of switching power supplies.

Method used

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  • A digital loop compensator for flyback switching power supply
  • A digital loop compensator for flyback switching power supply
  • A digital loop compensator for flyback switching power supply

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Embodiment Construction

[0036] Such as figure 1 , figure 2 As shown, after establishing the mathematical model of the Flyback circuit, the transfer function G of the AC small signal system is obtained vd (s), and then the transfer function of the system is obtained through S-domain transformation. According to the different states of the diode D and the switch tube Q1, the working process of the flyback converter is divided into two stages in each switching cycle. We choose inductor current and capacitor voltage as state variables.

[0037] Using the average state space method, we can get the small-signal mathematical model of the flyback switching power supply. Due to the switching device states, the average state space method can obtain the state equations of different circuits. The establishment of the average state-space model includes four steps: (1) static operating point calculation; (2) disturbance superposition; (3) disturbance separation and linearization; (4) frequency characteristic ...

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Abstract

The invention discloses a digital loop compensator of a flyback switching power supply. With the rapid development of electronic technology, the integration of switching power supply is getting higherand higher. The compensator design of digital switching power supply is a key technology in the design of switching power supply controller. The realization method and algorithm optimization of digital compensator have a direct impact on the control accuracy and ripple coefficient of switching power supply. The invention mainly relates to an S-domain small signal model of a digitally controlled flyback circuit closed-loop system, wherein the closed-loop loop in the model is divided into several main parts: a power conversion stage Gs (s), a sampling Gad (s), a digital compensator Gc (s), anda DPWM generator Gdpwm (s). As that digital loop compensator of the invention can overcome the defect that the transient control characteristics are relatively poor in the prior art and the like, theintegral separation PID algorithm is adopt, not only the response time of the system is improved, but also the overshoot of the system is reduced.

Description

technical field [0001] The invention relates to the technical field of switching power supply control, in particular to a control device and method for a digital loop compensator. Background technique [0002] Linear power supplies have the disadvantages of large volume, low efficiency, and low power density, and the emergence of switching power supplies overcomes these shortcomings of linear power supplies, and has been developed rapidly in recent years. As far as the technical difficulty of development is concerned, the technical difficulty of switching power supply is greater than that of linear power supply, which also limits the rapid popularization and promotion of switching power supply. The switching power supply control circuit on the market is implemented by using error amplifiers, power management chips, comparators, etc. The controller has disadvantages such as complex circuit design, large number of components, control performance is easily affected by the envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33515H02M3/33523H02M1/0016
Inventor 陈宝远李博健刘洋
Owner HARBIN UNIV OF SCI & TECH
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