Noise cancellation method and noise cancellation circuit

A technology of noise elimination and power stage circuit, which is applied in the field of electronics and can solve problems such as increased circuit loss
CN103401404BActive Publication Date: 2015-10-14SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
SILERGY SEMICON TECH (HANGZHOU) CO LTD
Publication Date
2015-10-14

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Abstract

The invention relates to the field of electronics and discloses a noise eliminating method and a noise eliminating circuit. The noise eliminating method comprises the following steps of sampling output voltage signals of a power-level circuit, and obtaining a current output feedback signal; and determining whether the frequency of a first driving signal currently input to the power-level circuit is in an audio range according to a current output feedback signal, if yes, disconnecting the power-level circuit and a circuit of the first driving signal, outputting a first low-frequency driving signal and a first high-frequency driving signal to the power-level circuit, wherein the frequency of the first low-frequency driving signal is lower than the lower limit of the audio, and the frequency of the first high-frequency driving signal is higher than the upper limit of the audio. The application of the technical scheme of the invention facilitates the reduction of the circuit noise and avoidance of the circuit loss.
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Description

technical field

[0001] The invention relates to the field of electronics, in particular to a noise elimination method and a noise elimination circuit. Background technique

[0002] The power supply is generally composed of a power stage circuit and a control circuit. When the power stage circuit is in a light-load working state, the output feedback signal detected by the control circuit representing the output voltage will decrease. In the control circuit, a threshold is generally set to represent the light-load state of the load. When the output feedback signal is lower than the threshold, the power stage circuit enters the light-load working state, that is, the burst mode. At this time, the control circuit will work intermittently, that is, the frequency of the driving signal input to the power stage circuit will decrease, and as the load becomes lighter, the frequency of the driving signal will also decrease.

[0003] In the circuit, when the frequency of the driving sig...

Claims

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