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Control method and compensation circuit of switch mode power supply

A technology of switching mode power supply and compensation circuit, which is applied in the direction of conversion equipment with intermediate conversion to AC, irreversible conversion of AC power input into DC power output, etc., and can solve problems such as discomfort

Active Publication Date: 2016-08-24
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, skip mode and burst mode are prone to unpleasant audio noise if there is no proper control of the energy transfer during the effective switching cycle

Method used

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  • Control method and compensation circuit of switch mode power supply
  • Control method and compensation circuit of switch mode power supply
  • Control method and compensation circuit of switch mode power supply

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Embodiment Construction

[0071] The present invention will be described below with a flyback switching mode power supply (converter) as an embodiment, but the present invention is not limited to the flyback type, and can also be applied to boost (boost), step-down Compression (buck), or other forms of architecture.

[0072] figure 1 In order to implement a power management device 60 according to the present invention, the AC power supply V AC The input energy is converted into an output power V that meets a specification requirement OUT . The bridge rectifier (bridgerectifier) ​​62 roughly converts the AC power V AC rectification. Gate signal S G Controlled, the power switch 72 controls the primary winding (primarycoil) L in the transformer (transformer) 64 p The current in the control transformer 64 stores or releases energy. The electric energy released by the transformer 64 will pass through the rectifier 66 and be stored in the output capacitor 69 to generate the output power V OUT . Feed...

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Abstract

The control method and compensation circuit of a switch mode power supply are suitable for a switch mode power supply to provide an output power. The compensation circuit includes a resistor, a switch, and a compensation capacitor. The resistor and the switch are connected in series between a power supply terminal and a compensation terminal. The compensation capacitor is connected to the compensation terminal. The compensation voltage of the compensation terminal roughly reflects the output power. When the compensation voltage is less than a preset value for at least a preset time, the switch is in an open state, and current cannot flow from the power supply terminal through the resistor to the compensation terminal.

Description

technical field [0001] The invention relates to a power supply. Background technique [0002] The power supply is used to convert power to provide power that meets the specifications for electronic devices or components. In consideration of conversion efficiency, the energy consumed by the power supply itself should be as small as possible. Especially at light load or no load, a little energy consumption of the power supply will greatly reduce the conversion efficiency. Therefore, how to reduce the energy loss of the power supply under light load or no load is the goal pursued by designers. [0003] At light load or no load, switched mode power supplies are designed to operate in skip mode or burst mode. Conceptually, the jump mode and the cluster mode both stop several consecutive switching cycles that are roughly ineffective, and concentrate energy conversion on several consecutive switching cycles that are relatively effective. However, skip mode and burst mode are pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12H02M3/28
Inventor 魏大钧叶文中
Owner LEADTREND TECH
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