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Carrier-based D-class amplifier double-integral sliding mode controller design method and circuit

A class D amplifier and design method technology, applied in CAD circuit design, instrument, calculation, etc.

Active Publication Date: 2019-03-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, implementations in applications where the reference signal is time-varying have never been reported

Method used

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  • Carrier-based D-class amplifier double-integral sliding mode controller design method and circuit
  • Carrier-based D-class amplifier double-integral sliding mode controller design method and circuit
  • Carrier-based D-class amplifier double-integral sliding mode controller design method and circuit

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Embodiment Construction

[0089] Such as figure 2 Shown, carrier-based class D amplifier double integral sliding mode controller design method of the present invention comprises the following steps:

[0090] Step 1, using the output voltage of the class D amplifier and the inductor current as state variables, establishing a state space model of the class D amplifier;

[0091] In this embodiment, the state space model of the established class D amplifier is as follows, with the output voltage and the inductor current of the class D amplifier as the state variables described in step 1:

[0092]

[0093] where x is the state vector and x=[i L v o ] T , f(x,t) is a function of the state vector x and g(x,u,t) is a function of the state vector x and Such as image 3 Shown, L is the inductance, v o is the output voltage, R is the resistance, C is the capacitance, i L is the inductor current, V IN is the power supply voltage, m is the modulation depth and the value range of m is -1~1. The circ...

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Abstract

The invention discloses a carrier-based D-class amplifier double-integral sliding mode controller design method and circuit, and the method comprises the steps: 1, building a state space model of a D-class amplifier by taking the output voltage and inductive current of the D-class amplifier as state variables; 2, designing the sliding surface equation as a function state variable for determining the dynamic characteristics of the system; 3, deducing an equivalent control equation serving as a state variable function; and 4, obtaining the controller gain by utilizing the existence condition ofthe system kept on the sliding surface and the stable condition of the system dynamically approaching the balance point on the sliding surface. The circuit comprises a first differential amplifier circuit, a reference voltage bias circuit, a proportional integral controller circuit, a second differential amplifier circuit and a comparator circuit. According to the invention, the Q factor is compensated, the flat frequency response is ensured, the switching frequency is ensured to be fixed, the influence of power level nonlinearity is reduced, the total harmonic distortion and noise are improved, and the cost and the overall efficiency are not influenced.

Description

technical field [0001] The invention belongs to the technical field of class D amplifier control, and in particular relates to a design method and circuit of a carrier-based double-integral sliding mode controller for class D amplifiers. Background technique [0002] In the past two decades, Class D amplifiers have gained widespread attention due to their high efficiency, ease of implementation, and low cost. In particular, recent advances in wide-bandgap (WBG) devices such as SiC MOSFETs, which offer higher switching frequencies, enable Class D amplifiers to maintain high efficiency while increasing THD. However, they often cannot be used due to their irregular frequency response compared to linear Class D amplifiers. We wanted to improve the frequency response of the Class D amplifier while maintaining high efficiency. [0003] Due to the high Q-factor filter, the response peaks at the resonant frequency. In an open-loop configuration, the Q factor is strongly dependent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/36G06F30/398
Inventor 郑先成罗美君
Owner NORTHWESTERN POLYTECHNICAL UNIV
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