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Switching control method of Boost converter based on output feedback

A technology of output feedback and control method, which is applied in the field of DC-DCBoost converter control, can solve the problems of increasing system control cost and increasing control system information redundancy, and achieve the effects of reducing control cost, improving dynamic characteristics, and flexible control objectives

Pending Publication Date: 2022-07-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these control methods based on large signal models need to collect information about the entire state of the system, including current and voltage values ​​in the system, which increases the control cost of the system and increases the information redundancy of the control system.

Method used

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  • Switching control method of Boost converter based on output feedback
  • Switching control method of Boost converter based on output feedback
  • Switching control method of Boost converter based on output feedback

Examples

Experimental program
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Embodiment 1

[0047] This embodiment provides a switching control system based on output feedback, see figure 1 , the switching control system is used to realize the control of the Boost converter, and the switching control system includes: an output voltage acquisition device, a Luenberger observer, a desired output voltage setting terminal, a switching controller and a drive circuit; the output voltage The acquisition device, the Luenberger observer, the switching judger and the drive circuit are connected in sequence; the output voltage acquisition device is used to acquire the output voltage v of the Boost converter C , the Luenberger observer is used to observe the state of the Boost converter according to the system output voltage value The switching controller is used to set the desired output voltage v according to ref and Boost converter state observations The state of the switching signal is determined; the driving circuit is used to control the on or off of the MOSFET in the ...

Embodiment 2

[0051] This embodiment provides a switching control method for a Boost converter based on output feedback. The method is implemented based on the switching control system described in Embodiment 1, and the method includes:

[0052] The state space model of the switching control system is established according to the equivalent circuit of the boost converter; the switching on and off of the MOSFET in the equivalent circuit of the boost converter correspond to the state of the switching signal σ in the switching control system.

[0053] Let the system state x = [i L v C ] · , i L is the inductor current, v C is the capacitor voltage, such as figure 1 As shown, the capacitor C is in parallel with the load resistance R, so the capacitor voltage v C That is, the output voltage.

[0054] Then the system state space switching model is expressed as:

[0055]

[0056] In the formula,

[0057] C 1 =C 2 =[0 1].

[0058] where A 1 , B 1 and C 1 is the system matrix whe...

Embodiment 3

[0071] This embodiment provides a switching control method for a Boost converter based on output feedback. The method is implemented based on the switching control system described in Embodiment 1, and the method includes:

[0072] Step 1, establish the state space switching model of the switching control system, and calculate the system parameter matrix of the state space switching model of the switching control system system according to the Boost converter input voltage and component parameters;

[0073] Step 2: Calculate the desired state of the switching control system according to the desired output voltage;

[0074] Step 3: Calculate the observer gain and the switching controller gain of the switching control system according to the system parameter matrix determined in step 1 and the desired state calculated in step 2;

[0075] Step 4: Substitute the observer gain into the Luenberger observer to observe the system state. Substitute the switching controller gain into t...

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Abstract

The invention discloses a switching control method of a Boost converter based on output feedback, and belongs to the technical field of DC-DC Boost converter control. The output feedback switching control method of the Boost converter is realized by establishing a state space switching model of a switching control system, introducing a switching Luenberger observer, observing the state of the system through the output voltage of a sampling system, designing a switching judgment function by utilizing the observed state, and acting a switching signal on an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) through a driving circuit. The method can improve the dynamic characteristics of the system, achieves a more flexible control target, reduces the control cost of the system through the introduction of output feedback, and can achieve the control target of the system only through the sampling of the output voltage.

Description

technical field [0001] The invention relates to a switching control method of a boost converter based on output feedback, belonging to the technical field of DC-DC boost converter control. Background technique [0002] Boost converter is a typical type of DC-DC converter, which is used to convert the input voltage and effectively output a fixed voltage. As a variable DC power supply, there are many applications in industrial sites. The traditional DC-DC converter control strategy is based on the pulse width modulation (PWM) method of the small-signal model, which realizes the steady-state control of the output voltage through a fixed switching frequency, but the small-signal model is an approximate linear model of the system at the operating point, so The control method based on the small signal model can only guarantee the steady-state output of the system at the operating point, but cannot guarantee the dynamic characteristics of the system from the initial point to the op...

Claims

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Application Information

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IPC IPC(8): H02M3/156H02M1/08
CPCH02M3/156H02M1/08
Inventor 张凌宇林豪杰楼旭阳
Owner JIANGNAN UNIV
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