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Switch power supply and control method thereof

A technology of switching power supply and control method, which is applied in the direction of control/adjustment system, electrical components, and adjustment of electrical variables, etc., which can solve problems such as noise and uncertain modulation signal frequency, and achieve the effects of simple circuit structure, noise reduction, and low cost

Active Publication Date: 2010-03-10
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that when the switching power supply is in the light load or standby state, the frequency of the modulation signal in the prior art exists in the intermittent mode because the frequency of the modulation signal is automatically adjusted according to the power demand of the load, resulting in an uncertain frequency of the modulation signal, which may cause noise The problem

Method used

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  • Switch power supply and control method thereof
  • Switch power supply and control method thereof
  • Switch power supply and control method thereof

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Embodiment Construction

[0030] figure 1 It is a specific embodiment according to the idea of ​​the present invention, which is based on the flyback topology. The invention can also be applied to other switching power supply topologies, and this embodiment uses the flyback topology as an illustration for the convenience of illustration.

[0031] In this embodiment, the voltage input signal Vin is adjusted to provide energy to the load. Such as figure 1 As shown, first, the voltage input signal Vin is coupled to the energy transmission unit transformer T1, and the switch S1 is periodically turned on and off under the action of the control signal 101, so that the energy of the primary side of the transformer T1 is coupled to the secondary side, and then After being rectified by the diode D1 and filtered by the capacitor C1, a constant value signal Uo is finally obtained. The constant value signal can be a voltage signal Vo or a current signal Io. In a specific embodiment of the present invention, the...

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Abstract

The invention discloses a control method and a device of a switch power supply. When the switch power supply works in light load condition, a high-frequency impulse signal is modulated by a low-frequency modulating signal to generate a switch driving signal, therefore, in the period of the modulating signal, a switch is driven by a group of continuous high-frequency impulse signals, or keeps at closed state, thus realizing closed loop adjustment to the output of the switch power supply.

Description

technical field [0001] The invention relates to a switching power supply capable of entering burst-mode (intermittent mode) in a light-load state, in particular to a burst-mode control circuit of the switching power supply. Background technique [0002] Today, more and more electronic products are powered by switching power supply, which is due to the good characteristics of switching power supply itself. The operating frequency of the switching power supply is generally above tens of kilohertz, and the energy is transferred by turning on and off the semiconductor device, so it has the advantages of small size, light weight, and high conversion efficiency. [0003] To achieve energy conversion, switching power supplies can use a variety of topologies. Take the widely used flyback (flyback) topology as an example to describe the principle of switching power supply. Generally, it can be divided into the following functional modules: energy input unit, energy coupling unit, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/00
CPCY02B70/16H02M3/33507H02M2001/0032H02M3/156H02M1/0032Y02B70/10
Inventor 石洋张军明任远程
Owner CHENGDU MONOLITHIC POWER SYST
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