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High voltage starting circuit applied to AC/DC converter

A technology of DC converter and high-voltage start-up, which is applied in the electronic field, can solve the problems of reducing start-up time, inability to ensure, and reduce standby loss, so as to achieve the effects of improving efficiency, accelerating start-up speed, and reducing standby power consumption

Inactive Publication Date: 2011-06-15
深圳市展芯微电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the AC / DC converter in the existing flyback power supply cannot ensure that the startup time can be reduced and the standby loss can be reduced.

Method used

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  • High voltage starting circuit applied to AC/DC converter
  • High voltage starting circuit applied to AC/DC converter

Examples

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Embodiment Construction

[0030] At first, the technical term involved in the present invention is explained:

[0031] UVLO: Under Voltage Lockout, undervoltage lockout;

[0032] NJFET: N-channel Junction Field Effect Transistor, N-channel junction field effect transistor;

[0033] PMOS: P-channel metal oxide semiconductor FET, P-channel metal oxide semiconductor field effect transistor;

[0034] NMOS: N-channel metal oxide semiconductor FET, N-channel metal oxide semiconductor field effect transistor.

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0036] see figure 2 , is a schematic diagram of a high-voltage start...

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PUM

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Abstract

The invention provides a high voltage starting circuit applied to an AC / DC converter, which comprises a constant current circuit and a constant current switching-off circuit, wherein the constant current circuit is used for setting a constant current in a negative feedback control way, and charging an external capacitor (Cext) of a power voltage (VCC) of the AC / DC converter by utilizing the constant current; and the constant current switching-off circuit is used for switching the constant current circuit off and stopping charging the external capacitor (Cext) when the power voltage (VCC) rises to a starting threshold UVLO_OFF, and switching the constant current circuit on and starting charging the external capacitor (Cext) when the power voltage (VCC) drops to a switching-off threshold UVLO_ON. The high voltage starting circuit can effectively reduce the standby loss of the AC / DC converter at the same time of accelerating the starting of the AC / DC converter.

Description

technical field [0001] The invention belongs to the field of electronic technology, in particular to a high-voltage starting circuit applied to an AC / DC converter. Background technique [0002] With the continuous progress and development of human society, the consumption of energy is increasing, and the pollution caused is also becoming more and more serious. Today, when energy is increasingly tight and environmental protection requirements are constantly improving, all walks of life have put forward stricter requirements on the energy consumption of their products. In the fiercely competitive power supply field, power supply designers are constantly updating their designs to enable their designs to achieve lower energy consumption requirements, in order to occupy a place in the fierce market competition. [0003] like figure 1 Shown is a schematic circuit diagram of a typical application of an existing flyback power supply. The resistor R in the figure S It is connecte...

Claims

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Application Information

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IPC IPC(8): H02M1/36
CPCY02B70/16Y02B70/10
Inventor 夏云凯雷晗
Owner 深圳市展芯微电子技术有限公司
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