阅读说明：本技术 一种基于ssc的闭环负反馈控制系统 (Closed-loop negative feedback control system based on SSC ) 是由 党杰 于 2019-11-09 设计创作，主要内容包括：本发明提供一种基于SSC的闭环负反馈控制系统,包括：预制信号模块、比较电路、SSC执行电路、输出模块和扫描仪；所述预制信号模块输出端连接比较电路输入端；比较电路输出端连接SSC执行电路输入端；SSC执行电路输出端连接输出模块的输入端；输出模块的输出端连接扫描仪输入端；扫描仪输出端连接所述比较电路输入端。本发明通过将控制原理的知识引入电磁兼容设计之中,创新了基于SSC原理的辐射控制技术,同时通过反馈控制技术保障了控制系统的稳定,降低了对信号传输质量的影响。本发明能够提高电磁兼容的设计品质,保证产品顺利销售,获得大量的经济效益。(The invention provides a closed-loop negative feedback control system based on SSC, which comprises: the system comprises a signal prefabricating module, a comparison circuit, an SSC execution circuit, an output module and a scanner; the output end of the prefabricated signal module is connected with the input end of the comparison circuit; the output end of the comparison circuit is connected with the input end of the SSC execution circuit; the output end of the SSC execution circuit is connected with the input end of the output module; the output end of the output module is connected with the input end of the scanner; the output end of the scanner is connected with the input end of the comparison circuit. The invention introduces the knowledge of the control principle into the electromagnetic compatibility design, innovating the radiation control technology based on the SSC principle, simultaneously ensuring the stability of the control system through the feedback control technology and reducing the influence on the signal transmission quality. The invention can improve the design quality of electromagnetic compatibility, ensure the smooth sale of products and obtain a great amount of economic benefits.)

1. An SSC-based closed loop negative feedback control system, said system comprising:

the system comprises a signal prefabricating module, a comparison circuit, an SSC execution circuit, an output module and a scanner;

the output end of the prefabricated signal module is connected with the input end of the comparison circuit; the output end of the comparison circuit is connected with the input end of the SSC execution circuit; the output end of the SSC execution circuit is connected with the input end of the output module; the output end of the output module is connected with the input end of the scanner; the output end of the scanner is connected with the input end of the comparison circuit.

2. An SSC based closed loop negative feedback control system according to claim 1, characterized in that the system further comprises an amplifying circuit, the amplifying circuit input terminal is connected to the comparing circuit output terminal; and the output end of the amplifying circuit is connected with the input end of the SSC executing circuit.

3. The SSC-based closed loop negative feedback control system of claim 1, wherein said SSC execution circuitry includes a control chip that adjusts PCIE and memory DDR signals.

4. An SSC based closed loop negative feedback control system as claimed in claim 1 wherein the system adjusts the radiation intensity of the output signal to 6dB below the radiation standard limit.

5. An SSC based closed loop negative feedback control system according to claim 1 wherein the output module includes an external interface and a structural member.

6. An SSC based closed loop negative feedback control system according to claim 1 wherein the scanner scans the radiated voltage data output by the output module and outputs the radiated voltage data to the comparison circuit.

7. An SSC-based closed loop negative feedback control system as claimed in claim 1 wherein said pre-formed signal module stores commonly used radiation standard data, said radiation standard data being near field data converted from far field data; the far field data is radiation data obtained at 10 meters and 3 meters of the far field.

8. An SSC-based closed loop negative feedback control system according to claim 1 wherein the comparison circuit performs a difference operation on the output signal of the output module and the pre-stored signal output by the pre-signal module.

Technical Field

The invention relates to the technical field of closed-loop control, in particular to a closed-loop negative feedback control system based on SSC.

Background

In order to realize various complex control tasks, firstly, a controlled object and a control device are connected in a certain mode to form an organic whole, which is called an automatic control system. In an automatic control system, an output quantity (controlled quantity) of a controlled object is a physical quantity which is required to be strictly controlled, and can be kept at a certain constant value or operated according to a certain given rule, and a control device is a whole of a mechanism which exerts a control action on the controlled object, and can control the controlled object by adopting different principles and modes, but the most basic one is a feedback control system which is formed based on a feedback control principle.

In a feedback control system, a control action exerted on a controlled object by a control device is feedback information obtained from a controlled quantity, and is used for constantly correcting a deviation between the controlled quantity and an input quantity, thereby realizing a task of controlling the controlled object, which is a principle of feedback control. The process of sending the extracted output back to the input and comparing it with the input signal to produce a deviation signal is generally referred to as feedback. If the difference between the feedback signal and the input signal is smaller and smaller, the deviation is called negative feedback; otherwise, it is called positive feedback. The feedback control is a process of performing control by using a deviation and using negative feedback, and the whole control process becomes a closed process due to the introduction of feedback information of a controlled quantity, so the feedback control is also called as closed-loop control. In engineering practice, in order to realize feedback control of a controlled object, a system must have a measuring element, a comparing element and an executing element, which are collectively called a control device.

Ssc (spread spectrum clock) clock spreading technology, itself, is a technology used in the field of communications to process digital periodic signals. In recent years, the technology is applied to the field of EMC, and becomes a new method for dealing with EMC problems, and the spread spectrum adjustment technology is also called frequency jitter technology. All the existing methods for reducing electromagnetic radiation by using spread spectrum technology are based on a principle: a modulated signal of a certain waveform (such as a sine wave, a triangular wave or an optimized wave with a specific shape) is superimposed on a system clock in a frequency modulation (phase) mode, so that the frequency spectrum of the modulated frequency is not concentrated near a frequency point but distributed in a wider frequency band determined by the modulated wave.

Electromagnetic disturbance (EMI) is a serious and growing form of environmental pollution, the effect of which is as little as annoying crackling sounds produced upon broadcast reception, and as much as a safety critical control system crashes, possibly leading to fatal accidents. The radiation disturbance is the most important disturbance form in electromagnetic disturbance, and electromagnetic energy is directly radiated outwards in the form of electromagnetic waves, so that injury and disturbance are caused to human bodies and other equipment. The national standard GB9254 and European Union EN55022 of China stipulate the energy limit value of radiation interference, and the license of mandatory certification of CCC and CE can be obtained only through the tests of the standards.

The control of the radiation intensity by the SSC technique is a relatively simple method. However, there is a big disadvantage that the SSC is a frequency jitter technique, which is harmful to the stable transmission of signals, and the SSC adjusting circuit must be strictly controlled to fully exert the control effect of the SSC on the radiation intensity.

Disclosure of Invention

In view of the above-mentioned deficiencies of the prior art, the present invention provides an SSC-based closed-loop negative feedback control system to solve the above-mentioned technical problems.

In a first aspect, the present invention provides an SSC-based closed-loop negative feedback control system, comprising:

the system comprises a signal prefabricating module, a comparison circuit, an SSC execution circuit, an output module and a scanner;

the output end of the prefabricated signal module is connected with the input end of the comparison circuit; the output end of the comparison circuit is connected with the input end of the SSC execution circuit; the output end of the SSC execution circuit is connected with the input end of the output module; the output end of the output module is connected with the input end of the scanner; the output end of the scanner is connected with the input end of the comparison circuit.

Furthermore, the system also comprises an amplifying circuit, wherein the input end of the amplifying circuit is connected with the output end of the comparing circuit; and the output end of the amplifying circuit is connected with the input end of the SSC executing circuit.

Further, the SSC execution circuit includes a control chip, and the control chip adjusts PCIE and memory DDR signals.

Further, the system adjusts the radiation intensity of the output signal to 6dB below the radiation standard limit.

Further, the output module comprises an external interface and a structural member.

Further, the scanner scans and obtains radiation voltage data output by the output module, and outputs the radiation voltage data to the comparison circuit.

Further, the pre-signal module stores common radiation standard data, wherein the radiation standard data is near-field data converted from far-field data; the far field data is radiation data obtained at 10 meters and 3 meters of the far field.

Furthermore, the comparison circuit performs difference operation on the output signal of the output module and the pre-stored signal output by the pre-signal module.

The beneficial effect of the invention is that,

the closed-loop negative feedback control system based on the SSC provided by the invention is used for adjusting the EMI performance of the whole machine by establishing the closed-loop negative feedback control system and utilizing the SSC principle, and simultaneously ensuring the convergence and stability of the control system. The knowledge of the control principle is introduced into the electromagnetic compatibility design, so that the radiation control technology based on the SSC principle is innovated, meanwhile, the stability of a control system is ensured through the feedback control technology, and the influence on the signal transmission quality is reduced. The invention can improve the design quality of electromagnetic compatibility, ensure the smooth sale of products and obtain a great amount of economic benefits.

In addition, the invention has reliable design principle, simple structure and very wide application prospect.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic architecture diagram of a system of one embodiment of the present invention.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The following explains key terms appearing in the present invention.

In the SSC (spread Spectrum clock) clock spread Spectrum technology, the energy concentrated in a narrow frequency band range is dispersed to a set wide frequency band range by a clock spread Spectrum through a frequency modulation method, and the aim of reducing the electromagnetic radiation peak value of a system is fulfilled by reducing the amplitude (energy) of a clock at fundamental frequency and odd harmonic frequency.

FIG. 1 is a schematic architecture diagram of a system of one embodiment of the present invention.

As shown in fig. 1, the system includes:

the system comprises a signal prefabricating module, a comparison circuit, an SSC execution circuit, an output module and a scanner;

the output end of the prefabricated signal module is connected with the input end of the comparison circuit; the output end of the comparison circuit is connected with the input end of the SSC execution circuit; the output end of the SSC execution circuit is connected with the input end of the output module; the output end of the output module is connected with the input end of the scanner; the output end of the scanner is connected with the input end of the comparison circuit.

Optionally, as an embodiment of the present invention, the system further includes an amplifying circuit, an input end of the amplifying circuit is connected to an output end of the comparing circuit; and the output end of the amplifying circuit is connected with the input end of the SSC executing circuit. The amplifying circuit is used for amplifying the output of the comparison circuit and driving the executing component, namely the SSC adjusting circuit to control the radiation intensity of the output signal of the controlled object, namely the external interface and the structural component of the host.

Optionally, as an embodiment of the present invention, the SSC adjusting circuit is embedded in a control chip, and is mainly used for adjusting PCIE and memory DDR signals. To realize external interface and radiation control of high-speed signals. And the output radiation intensity is always 6dB below the limit of the radiation standard. Therefore, the requirement on the allowance of the test result in the radiation test is met, and meanwhile, the adjusting amplitude of the SSC adjusting circuit is not influenced by the signal transmission quality. The whole control system is ensured to reach a stable and convergent state.

Alternatively, as an embodiment of the present invention, the scanner may scan radiation voltage data of the external interface and structure of the host and transmit the radiation voltage data to the comparison circuit.

Optionally, as an embodiment of the present invention, common radiation standard data is stored in the pre-signal module. The radiation data in the standard is obtained at 10 meters and 3 meters far field, and all the prefabricated signals are converted into near field data through a certain rule.

Optionally, as an embodiment of the present invention, external interference acts on an external interface and a structural component of the host, which affects a radiation intensity value of the controlled object, and the radiation intensity of the interference coupling is an output of the entire control system. Therefore, the comparison circuit performs difference operation on the output signal of the output module and the pre-stored signal output by the pre-signal module.

In order to facilitate understanding of the present invention, the principle of the SSC-based closed-loop negative feedback control system of the present invention is further described below in conjunction with the embodiments of the present invention.