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Push-pull converter, and switch frequency control device and method

A technology of switching frequency and frequency controller, which is applied in the direction of output power conversion device, conversion of DC power input to DC power output, control/regulation system, etc. It can solve problems such as unproposed solutions and high EMI, and achieve reduction of EMI, Improve the effect of customer experience

Pending Publication Date: 2017-08-18
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problem of high EMI caused by the push-pull converter operating at the same switching frequency in the above-mentioned related technologies, no effective solution has been proposed so far

Method used

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  • Push-pull converter, and switch frequency control device and method
  • Push-pull converter, and switch frequency control device and method
  • Push-pull converter, and switch frequency control device and method

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Embodiment Construction

[0030] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate ...

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Abstract

The present invention discloses a push-pull converter, and a switch frequency control device and method. The push-pull converter comprises transistors and a frequency controller configured to control switch frequencies of two transistors; the frequency controller is configured to control the two transistors to perform duty-cycle operation with different switch frequencies in the jittering period comprising one or more than one alternate periods; and the two transistors performs alternation operation with the same switch frequency in one alternate periods. The technical problem is solved that a push-pull converter generates high EMI (Electro Magnetic Interference) in the same switch frequency in the prior art.

Description

technical field [0001] The invention relates to the field of switches, in particular to a push-pull converter, a switching frequency control device and a method. Background technique [0002] In the related art, the push-pull converter uses a high-frequency transformer to achieve isolation and voltage conversion, figure 1 is a schematic diagram of a push-pull converter according to the prior art, such as figure 1 As shown, this method is safer than non-isolated converters, and at the same time, it has higher efficiency, lower cost, and smaller volume than power frequency isolated converters. In addition, the output power of push-pull converters is larger than that of flyback converters, so in For inverter applications that require isolation, push-pull converters are widely used. [0003] Now when all converter systems are used in equipment, they must pass the safety regulations and standards that meet the certification, among which EMI (Electro Magnetic Interference, that ...

Claims

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Application Information

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IPC IPC(8): H02M3/337H02M1/44
CPCH02M1/44H02M3/337
Inventor 刘龙
Owner GREE ELECTRIC APPLIANCES INC
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