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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

Active Publication Date: 2008-06-25
FREMONT MICRO DEVICES SHENZHEN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this switching power supply does not introduce noise in standby mode, it increases the cost of switching power supply

Method used

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  • Switch power supply and control method with awaiting orders mode thereof
  • Switch power supply and control method with awaiting orders mode thereof
  • Switch power supply and control method with awaiting orders mode thereof

Examples

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Embodiment Construction

[0018] The present invention will be further elaborated below according to the drawings and specific embodiments.

[0019] Such as figure 1 As shown, the switching power supply of the present invention is an isolated switching power supply, which may include a transformer 110, a switching tube 116, a feedback circuit 114, a PWM control circuit 115 and a starting circuit. Wherein, the terminal 101 connected to the terminal with the same name on the primary side of the transformer 110 is the DC power after the AC power is rectified by bridge. In other embodiments, the terminal 101 may also be connected to a DC voltage source. The drain of the switch tube 116 is connected to the opposite terminal of the primary winding of the transformer 110 , its source is grounded through a resistor, and its gate is connected to the output terminal of the PWM control circuit 115 . The input terminal of the feedback circuit 114 is connected to the output terminal 111 of the secondary circuit o...

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PUM

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335
CPCY02B70/16Y02B70/10
Inventor 谷文浩郑曰
Owner FREMONT MICRO DEVICES SHENZHEN LTD
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