Controlling method of switching power supply and product using it

A technology of switching power supply and control method, which is applied in the direction of control/regulation system, collector, electric vehicle, etc., and can solve the problems of small induced current amplitude and small conduction loss

Active Publication Date: 2006-11-01
MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As mentioned above, under light load conditions, the pulse is narrow, so the amplitude of the induced current is small, and the conduction loss is not large. However, the pulse frequency is exactly the same as that under heavy load conditions, so the switching loss is also the same as under heavy load conditions. Equal, this is the deficiency of PWM switching power supply

Method used

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  • Controlling method of switching power supply and product using it
  • Controlling method of switching power supply and product using it
  • Controlling method of switching power supply and product using it

Examples

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Embodiment Construction

[0043] In the following, seven embodiments are used to describe the specific content of the present invention. The embodiments all adopt the BUCK circuit topology, but are applicable to all other topologies.

[0044] Figure 4A Showing the circuit structure of the first embodiment adopting the first control method, Figure 4BThen it is the main working waveform under the light load condition of this embodiment. It can be seen from the figure that the switching power supply is composed of a power switching circuit 10 and a control circuit 20 . In the power switch circuit, the power switch tube S drain and V IN Electrically coupled, the source is electrically coupled to the cathode of the diode D and one end of the inductor L, and the capacitor C OUT electrically coupled with the inductor L and diode D cathode, V OUT That is the output voltage; the control electrode of the S tube is electrically coupled to the output terminal of the gate valve driver in the control circuit; ...

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PUM

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Abstract

The invention is designed for use in controlling switching power supply in mobile phone and PDA. Wherein, to reach the aim of reducing pulse switch times, lowering switching loss and improving electrical efficiency at a condition of light loading, a pulses skipping method and a pulses frequency modulation (PFW) method are provided. In the pulses skipping method, at light loading, intermittently stops the switch action of switch circuit to reduce the switch times. In the pulses frequency method, a pulses frequency modulator is used to lower an oscillation frequency at light loading condition to reduce the pulse switch times.

Description

technical field [0001] The invention relates to a control method suitable for controlling battery-powered switching power supplies in mobile electronic devices such as mobile phones and personal digital assistants (PDAs), and products manufactured using the control method. Background technique [0002] With the rapid popularization of mobile phones and personal digital assistants (PDAs), prolonging the service life of batteries in similar mobile electronic devices as much as possible has become an urgent need for consumers. There are two points of view to prolong the service life of the battery. One is to increase the storage capacity of the battery, and the other is to save electricity and improve the efficiency of the use of electric energy. Here, we only discuss the second point of view. [0003] Regardless of whether it is a mobile phone or a personal digital assistant (PDA), there are two different power consumption states except that it is turned off and stopped: one i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02J7/00H02M3/156
Inventor 徐鹏
Owner MONOLITHIC POWER SYST
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