Controlling method for isolated converter, control circuit and switching mode power supply

A control method and technology of control circuits, which are applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as dynamic responsiveness and stability conflicts, achieve faster dynamic response speed, and reduce standby time. The effect of loss

Active Publication Date: 2015-08-12
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
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Problems solved by technology

[0004] In view of this, the present invention provides a control method, control circuit and switching power supply of an isolated converter to solve the problem of conflicting dynamic response and stability in the prior art, and at the same time reduce the problem of standby loss

Method used

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  • Controlling method for isolated converter, control circuit and switching mode power supply
  • Controlling method for isolated converter, control circuit and switching mode power supply
  • Controlling method for isolated converter, control circuit and switching mode power supply

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Embodiment Construction

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0045] refer to figure 2 , shows a circuit diagram of an embodiment of a control circuit of an isolated converter according to the present invention. In this embodiment, the isolated converter takes a flyback converter as an example, but it is not limited thereto. The isolated converter receives the input voltage signal V IN , to provide a stable output voltage Vo for the load. Specifically, the flyback converter includes a transformer composed of a primary...

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Abstract

The invention provides a controlling method for an isolated converter, a control circuit and a switching mode power supply. In the control circuit and the controlling method, a wake-up signal is generated through setting different thresholds in different operation mode processes of the isolated converter, thereby realizing relatively small drop value of the output voltage of the isolated converter in a dynamic loading period for increasing the dynamic response speed of a system, and furthermore operation of the isolated converter in a very low operation frequency in a stable load period of a standby operation manner can be realized, thereby effectively reducing a standby loss.

Description

technical field [0001] The invention relates to the field of switching power supplies, more specifically, to a control method, a control circuit and a switching power supply of an isolated converter. Background technique [0002] The switching power supply controlled by the primary side is widely used in the field of power supply such as LED drive power supply, charger and adapter due to the advantages of less system components, simple structure and low cost. [0003] In the primary side control system realized by the existing technology, such as figure 1 As shown, the detection of the output voltage is realized indirectly through the detection of the secondary winding voltage of the transformer. This primary side control system does not detect the output voltage in real time, but only samples the voltage on the auxiliary winding of the transformer in each switching cycle to realize the detection of the output voltage, so that when the output load changes from light load or...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/335H02M1/0032H02M1/0048H02M1/08H02M3/33507Y02B70/10
Inventor 张少斌白永江胡志亮李乐董晋平
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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