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Frequency jitter device and method and power management device

A power management device, frequency jitter technology, applied in the direction of output power conversion device, automatic power control, electrical components, etc.

Active Publication Date: 2014-01-01
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods in the prior art require considerable chip area when implemented in an integrated circuit

Method used

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  • Frequency jitter device and method and power management device
  • Frequency jitter device and method and power management device
  • Frequency jitter device and method and power management device

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Embodiment Construction

[0054] In order to make the above and other objects, features, and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0055] For the convenience of description, equivalent or similar functions will be denoted by the same symbol. Therefore, elements with the same symbol in different embodiments do not mean that the two elements are necessarily the same. The scope of the present invention should be determined based on the claims.

[0056] figure 1 A power management device 60 implemented according to the present invention is a flyback (flyback) power converter (converter), which will be powered by the AC power V AC The input energy is converted into an output power V that meets a specification requirement OUT . The bridge rectifier (bridge rectifier) ​​62 roughly converts the AC power V AC rectification. The power switch 72 controls the primary winding (pri...

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Abstract

The invention relates to a frequency jitter device and a frequency jitter method and a power management device. The frequency jitter device comprises an oscillator and a frequency control circuit, wherein the oscillator is used for generating a signal; when the intensity of the signal is greater than that of a reference signal, the oscillator is operated in the first state approximately; when the intensity of the signal is smaller than that of the reference signal, the oscillator is operated in the second state approximately; and the frequency control circuit is used for changing the reference signal to change the frequency of the signal.

Description

technical field [0001] The present invention relates to a method and device for controlling the frequency of an oscillator in an electronic device, especially a method and device for reducing electromagnetic interference (EMI) by jittering the frequency. Background technique [0002] Switching power supply (switching power supply) is already a power supply used in most consumer electronic devices. It controls the energy storage and release in the inductor through the switching of a power switch to provide power that meets the specification requirements. power supply. If the switching of the power switch is always maintained at a specific frequency, the electromagnetic wave can easily pass through the connection in the electronic device and emit the electromagnetic wave of the specific frequency, which may cause electromagnetic interference. [0003] One method to solve the electromagnetic interference is to jitter the switching frequency of the power switch around a specifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/00H02M1/44H02M3/335
Inventor 叶文中沈逸伦
Owner LEADTREND TECH