Switch power supply and control method with awaiting orders mode thereof

A switching power supply, mode control technology, applied in control/regulating systems, electrical components, regulating electrical variables, etc., can solve problems such as increasing the cost of switching power supplies, and achieve the effect of reducing power loss
CN101207333AActive Publication Date: 2008-06-25FREMONT MICRO DEVICES SHENZHEN LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FREMONT MICRO DEVICES SHENZHEN LTD
Publication Date
2008-06-25

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Abstract

The invention discloses a standby-mode controlling method of a switching power source; when the outputted voltage Vct1 of a feedback circuit is detected to be decreased from more than V3 to be less than V1, a pulse controlling signal is stopped outputting; when Vct1 is detected to be increased from less than V1 to be more than V2, a signal PG1 is outputted and the time-counting function is started; when Vct1 is detected to be increased again from less than V2 to be V2, the time-counting function is stopped; if the counted time is less than T1, a signal PG2 is outputted and the time-counting function is again started; the duty ratio of the signal PG2 is more than that of the PG1; if the counted time is more than T1, a signal PG3 is outputted and the time-counting function is again started; the duty ratio of the signal PG3 is less than that of the PG1; the voltage V3 is more than V2 that is more than V1. The invention also discloses the switching power source. The invention can reduce the power loss of the switching power source under the condition of the light load, and can control the noise under the standby mode within a given range.
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Description

technical field

[0001] The invention relates to switching power supply technology, in particular to a switching power supply and a standby mode control method thereof. Background technique

[0002] A switching power supply can efficiently convert a power supply into one or more DC outputs, and the voltage of these output power supplies can be greater or less than the original power supply voltage. Switching power supplies are generally used in the power supply of electronic equipment, especially battery-powered equipment, such as mobile phones, notebook computers and so on. These devices have a normal working mode and a standby working mode. These devices need more energy to work in the normal working mode, and relatively less energy is required in the standby working mode.

[0003] In the standby mode, although some electronic devices do not require a lot of energy from the power supply, the noise of the power supply voltage needs to be controlled within a known small rang...

Claims

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