Control circuit, switch mode power supply circuit and standby control method

A technology of power supply circuit and control circuit, applied in the electronic field, can solve problems such as uncontrollable hiccup frequency, noise generation, large output voltage Vout output ripple, etc.

Active Publication Date: 2020-07-03
杭州必易微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this hiccup mode has the defect that the hiccup frequency cannot be controlled. When the frequency is relatively

Method used

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  • Control circuit, switch mode power supply circuit and standby control method
  • Control circuit, switch mode power supply circuit and standby control method
  • Control circuit, switch mode power supply circuit and standby control method

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Embodiment Construction

[0030] In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0031] The description in this part is only for several typical embodiments, and the present invention is not limited to the scope of the description of the embodiments. Combinations of different embodiments, mutual replacement of some technical features in different embodiments, mutual replacement of the same or similar prior art means and some technical features in the embodiments are also within the scope of description and protection of the present invention.

[0032] "Coupling" or "connection" in the specification includes both direct connection and indirect connection. An indirect connection is a connection through an ...

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PUM

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Abstract

The invention provides a control circuit, a switch mode power supply circuit and a standby control method. The control circuit comprises a comparison circuit, a period detection circuit and a parameter adjustment circuit, wherein the comparison circuit is used for comparing a feedback signal with at least one threshold signal, and the control circuit provides a hiccup control signal at least basedon the comparison of the comparison circuit; the period detection circuit is used for acquiring the period duration of the hiccup control signal; and the parameter adjusting circuit adjusts the threshold signal according to the period duration. The control circuit, the switch mode power supply circuit and the standby control method provided by the invention can be used for eliminating or reducingnoise in hiccup mode control and controlling output ripples.

Description

technical field [0001] The present invention relates to the field of electronics, specifically but not limited to a control circuit, a switch mode power supply circuit and a standby control method. Background technique [0002] In the switch mode power supply circuit, in order to reduce the standby power consumption, the hiccup mode control is performed by detecting the load state in the standby state. When the load is very small, the system enters the hiccup mode control, and the switching action is intermittently turned on and off. figure 1 A schematic diagram of the hiccup mode control waveform is shown. When the feedback signal VFB is smaller than the threshold signal Vskip, at time t1-t2, the system stops the switching action. When the switching operation stops, the output voltage Vout of the switch mode power supply circuit starts to decrease, and then the feedback signal VFB starts to rise. At time t2, when the feedback signal VFB is greater than the voltage thresho...

Claims

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Application Information

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IPC IPC(8): H02H7/12H02H1/00
CPCH02H1/0007H02H7/12H02H7/1213H02M1/0048Y02B70/10
Inventor 俞秀峰金伟祥程杰
Owner 杭州必易微电子有限公司
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