Frequency jittering circuit

A technology of frequency jitter and circuit, applied in the direction of electric pulse generator circuit, electrical components, output power conversion device, etc., can solve the problems of system stability influence, low switching power supply, etc., achieve high frequency jitter accuracy and improve consistency , the effect of saving chip layout area

Active Publication Date: 2011-04-20
灿芯创智微电子技术(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of light load, the frequency of the switching power supply is low. At this time, the ratio of the frequency jitter range to the frequency of the switching power supply is large, and the system stability is affected.

Method used

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Embodiment Construction

[0049] based on the following Figure 6 ~ Figure 20 , specify the preferred embodiment of the present invention:

[0050] Such as Image 6 Shown is a schematic structural diagram of the frequency dithering circuit of the present invention. The frequency dithering circuit includes a circuit-connected feedback voltage processing circuit 401 , a differential triangular wave generating circuit 402 , a differential-to-single-ended circuit 403 , and a voltage-controlled oscillator 404 .

[0051] The input terminal of the feedback voltage processing circuit 401 is connected to the feedback voltage, and the output terminal is connected to the differential triangular wave generating circuit 402, the differential to single-ended circuit 403, and the voltage controlled oscillator 404; the output end of the differential triangular wave generating circuit 402 is connected to the differential to single-ended circuit. terminal circuit 403; the output terminal of the differential to single-e...

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Abstract

The invention provides a frequency jittering circuit, which comprises a feedback voltage processing circuit, a differential triangular wave generating circuit, a differential converting single-end circuit and a voltage-controlled oscillator which are in circuit connection, wherein the input end of the feedback voltage processing circuit is connected with feedback voltage, and the output end of the feedback voltage processing circuit is connected with the differential triangular wave generating circuit, the differential converting single-end circuit and the voltage-controlled oscillator; the output end of the differential triangular wave generating circuit is connected with the differential converting single-end circuit the output end of which is connected with the voltage-controlled oscillator; and the output end of the voltage-controlled oscillator is connected with the differential triangular wave generating circuit, and is used for outputting a clock signal. The frequency jitteringcircuit has the advantages of good system stability and high frequency jittering accuracy.

Description

[0001] technical field [0002] The invention relates to a frequency dithering circuit. Background technique [0003] With the increasing tension of energy, how to make reasonable use of energy has been put on the agenda more and more. Switching power supply has been widely used for its advantages of high efficiency and low heat consumption. Most electrical equipment such as home appliances, handheld electronic equipment, and industrial control equipment use switching power converters as their power solutions. As a switching power supply system, an inescapable problem is that it uses clocks as a means of energy transfer, so electromagnetic interference is a problem that needs to be paid attention to in switching power supply systems. Usually, most of the energy of the switching power converter is concentrated at the fundamental frequency and low harmonic frequency of the switching frequency, and forms radiation peaks at these frequencies. In order to reduce the design dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44H03K3/023
Inventor 职春星吴启明徐滔李应天惠国瑜韩春峰
Owner 灿芯创智微电子技术(北京)有限公司
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