CN105939103A - Fractional order chaotic circuit applicable to PWM generator - Google Patents

Abstract

The invention relates to a fractional-order chaotic circuit that can be used in a PWM generator. The circuit is composed of three channel circuits: the first channel circuit is composed of a multiplier A1, a multiplier A2, an inverting integrator U1A, and resistors R13 and R14 , the second channel circuit is composed of multiplier A3, inverter U2A, inverter U3A, inverting integrator U4A and resistors R23, R24, R25, R26, R27 and R28; the third channel circuit is composed of multiplier A4, Phase device U5A, inverting integrator U6A, and resistors R33, R34, R35, and R36; the output signal of the first channel circuit is fed back to the input terminal, and the resistor R14 is connected as an input signal, and the output signal is also used as an input signal in the second channel circuit. One input signal of the multiplier A3, and the output signal is also connected to the multiplier A4 to act on the third channel circuit.

Description

A Fractional Order Chaotic Circuit Used in PWM Generator

technical field

The invention relates to a fractional order chaotic circuit which can be used in a PWM generator.

Background technique

With the practicality and large-capacity of power electronic power switching devices, it has become an inevitable trend to use high-frequency switching modes to solve power conversion and transmission, but at the same time it inevitably brings electromagnetic interference problems derived from the switching commutation process. In power electronic equipment such as switching converters, the main switch and the freewheeling diode are switching elements, and the energy is concentrated on the switching frequency and its harmonics, so that high-frequency pulses will be generated during the commutation process, and the circuit The stray parameters form high-frequency oscillations, resulting in serious electromagnetic interference problems.

Traditionally, the commonly used methods to solve the electromagnetic interference problem of switching converters mainly include filtering, coupling grounding, shielding, bypass and decoupling. The purpose of these methods is to cut off the transmission path of electromagnetic interference through peripheral circuits and measures, and limit the interference to the smallest possible area to reduce electromagnetic interference, but these methods cannot reduce the electromagnetic interference level of switching converters from the source. The study of electromagnetic interference characteristics shows that if the electromagnetic interference energy can be distributed as evenly as possible in the frequency domain, and then the peak value of the electromagnetic interference spectrum can be reduced, the electromagnetic interference level of the switching converter can be reduced. In view of the above-mentioned defects, the designer actively researches and innovates, in order to create a fractional-order chaotic circuit that can be used in PWM generators, so that it has more industrial application value.

Contents of the invention

In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a fractional-order chaotic circuit that can be used in PWM generators, so as to solve the problem that traditional measures such as filtering, coupling to ground, shielding, bypass and decoupling cannot reduce the switching conversion from the source. The problem of anti-electromagnetic interference of the device.

The fractional order chaotic circuit that can be used for PWM generator of the present invention, this circuit is made up of three channel circuits: the first channel circuit is made up of multiplier A1, multiplier A2, inverting integrator U1A, and resistance R13 and R14, and the second The two-channel circuit is composed of multiplier A3, inverter U2A, inverter U3A, inverting integrator U4A, and resistors R23, R24, R25, R26, R27 and R28, and the third-channel circuit is composed of multiplier A4, inverter Composed of U5A, inverting integrator U6A, and resistors R33, R34, R35, and R36; the output signal of the first channel circuit is fed back to the input terminal, and the resistor R14 is connected as an input signal, and the output signal is also used as a multiplier in the second channel circuit One input signal of A3, the output signal is also connected to the multiplier A4 to act on the third channel circuit; the output signal of the second channel circuit is fed back to the input terminal, connected to the resistor R23 as an input signal, and the output signal is also used as the first channel circuit One input signal of the middle multiplier A1, the output signal is also connected to the multiplier A4 to act on the third channel circuit; the output signal of the third channel circuit is connected to the resistor R36 to act on the third channel circuit, and the output signal is also used as the multiplier A1 and An input signal of the multiplier A2, and the output signal is also connected to the multiplier A3 to act on the second channel circuit.

The present invention has at least the following advantages: the fractional-order chaotic circuit of the present invention outputs a chaotic signal, and the chaotic signal can change the operating frequency of the PWM generator, thereby changing the frequency of the PWM signal output by the PWM generator and making the frequency spectrum of the PWM signal It has continuity. In this way, the energy of the PWM signal is no longer concentrated at the switching frequency of the switching converter and its multiplier, so the electromagnetic interference level of the switching converter can be suppressed.

The above description is only an overview of the technical solutions of the present invention. In order to understand the technical means of the present invention more clearly and implement them according to the contents of the description, the preferred embodiments of the present invention will be described in detail below.

Description of drawings

Fig. 1 is a schematic circuit diagram of a fractional order chaotic circuit that can be used in a PWM generator according to the present invention.

detailed description

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Referring to Fig. 1, a kind of fractional-order chaotic circuit that can be used for PWM generator described in a preferred embodiment of the present invention, this circuit is made up of three channel circuits: the first channel circuit is composed of multiplier A1, multiplier A2, inverter Phase integrator U1A, and resistors R13 and R14 are composed, and the second channel circuit is composed of multiplier A3, inverter U2A, inverter U3A, inverting integrator U4A and resistors R23, R24, R25, R26, R27 and R28 , the third channel circuit is composed of a multiplier A4, an inverter U5A, an inverting integrator U6A, and resistors R33, R34, R35 and R36; the output signal of the first channel circuit is fed back to the input terminal, and the resistor R14 is connected as an input signal , the output signal is also used as an input signal of the multiplier A3 in the second channel circuit, and the output signal is also connected to the multiplier A4 to act on the third channel circuit; the output signal of the second channel circuit is fed back to the input terminal, connected to the resistor R23 as One input signal, the output signal is also used as an input signal of the multiplier A1 in the first channel circuit, and the output signal is also connected to the multiplier A4 to act on the third channel circuit; the output signal of the third channel circuit is connected to the resistor R36 to act on the third channel circuit In the three-channel circuit, the output signal is also used as an input signal of the multiplier A1 and the multiplier A2, and the output signal is also connected to the multiplier A3 to act on the second channel circuit.

Due to the adoption of the above scheme, the fractional order chaotic circuit of the present invention outputs a chaotic signal, which can make the operating frequency of the PWM generator change, and then make the frequency of the PWM signal output by the PWM generator change, so that the frequency spectrum of the PWM signal has In this way, the energy of the PWM signal is no longer concentrated at the switching frequency of the switching converter and its multiplier, so the electromagnetic interference level of the switching converter can be suppressed.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. It should be pointed out that for those of ordinary skill in the art, some improvements can also be made without departing from the technical principle of the present invention. and modifications, these improvements and modifications should also be considered as the protection scope of the present invention.

Claims (1)

1. A kind of fractional order chaotic circuit that can be used for PWM generator, it is characterized in that: this circuit is made up of three channel circuits: the first channel circuit is made up of multiplier A1, multiplier A2, inverting integrator U1A and resistance R13 and R14, the second channel circuit is composed of multiplier A3, inverter U2A, inverter U3A, inverting integrator U4A and resistors R23, R24, R25, R26, R27 and R28, and the third channel circuit is composed of multiplier A4, inverter U5A, inverting integrator U6A, and resistors R33, R34, R35, and R36; the output signal of the first channel circuit is fed back to the input terminal, and the resistor R14 is connected as an input signal, and the output signal is also used as the second An input signal of the multiplier A3 in the channel circuit, the output signal is also connected to the multiplier A4 to act on the third channel circuit; the output signal of the second channel circuit is fed back to the input terminal, connected to the resistor R23 as an input signal, the output signal is also As an input signal of the multiplier A1 in the first channel circuit, the output signal is also connected to the multiplier A4 to act on the third channel circuit; the output signal of the third channel circuit is connected to the resistor R36 to act on the third channel circuit, and the output signal is also connected to the third channel circuit. As an input signal of the multiplier A1 and the multiplier A2, the output signal is also connected to the multiplier A3 to act on the second channel circuit.