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Isolated switching circuit and noise control circuit thereof

A switching circuit and noise control technology, applied in control/regulating systems, electrical components, regulating electrical variables, etc., can solve problems such as power supply noise interference, achieve simple circuit components, improve characteristics, and reduce switching noise.

Pending Publication Date: 2022-03-18
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, switching power supply will inevitably generate switching noise during operation
This switching noise exists in the form of ripple voltage or ripple current at the switching end of the switching power supply, and is transmitted to the power supply end through some loops, causing noise interference to the power supply

Method used

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  • Isolated switching circuit and noise control circuit thereof
  • Isolated switching circuit and noise control circuit thereof
  • Isolated switching circuit and noise control circuit thereof

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Embodiment Construction

[0020] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0021] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The invention discloses a noise control circuit of an isolated switching circuit. The noise control circuit generates a reverse noise signal through the adjustment of an off-chip component or a feedback signal of a circuit noise point, and couples the reverse noise signal to a proper end point of the circuit, thereby counteracting the noise of the circuit noise point, and preventing the noise from being transmitted to the power supply end of the isolated switching circuit to cause noise pollution. According to the noise control circuit provided by the invention, the influence of the switching noise of the isolated switching circuit caused by the circuit switching action on the power supply end is reduced, and the EMI (Electro-Magnetic Interference) characteristic of the circuit is improved.

Description

technical field [0001] Embodiments of the present invention relate to a switching power supply, and more specifically, to a noise control circuit for an isolated switching circuit. Background technique [0002] The switching power supply converts the input power into output power with specific voltage and current, which is provided to the load. The switching power supply controls the power switch with a certain frequency or duty cycle, so as to control its output power. Therefore, switching power supply will inevitably generate switching noise during operation. This switching noise exists in the form of ripple voltage or ripple current at the switching end of the switching power supply, and is transmitted to the power supply end through some loops, causing noise interference to the power supply. Elimination of these ripple voltages and ripple currents is a must in order for switching power supplies to comply with the necessary international standards. Contents of the inv...

Claims

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Application Information

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IPC IPC(8): H02M1/44H02M1/14H02M3/335
CPCH02M1/44H02M1/14H02M3/33523H02M1/143H02M3/33515
Inventor 王帅李晖
Owner CHENGDU MONOLITHIC POWER SYST
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