Secondary startup control circuit and switching power supply

A secondary start-up and switching power supply technology, applied in the field of circuits, can solve problems such as shortened start-up time

Inactive Publication Date: 2009-10-21
西安民展通讯科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The start-up time is another indicator of the switching power supply, which is the time required from the connection of the AC power supply and the AC input terminal of the switching power supply to the stabilization of the DC output. In order to ensure that the start-up time is within the specified range, the designer will The start-up time is designed with the lowest input voltage, so that the start-up time will be greatly shortened under high AC input voltage; while the "hiccup" type short-circuit protection will start repeatedly when it is working, which will cause a large AC input power

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  • Secondary startup control circuit and switching power supply
  • Secondary startup control circuit and switching power supply
  • Secondary startup control circuit and switching power supply

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Embodiment Construction

[0066] According to the requirements of safety, reliability and energy saving of switching power supply, the present invention introduces a secondary start control circuit into the commonly used AC-DC switching power supply controller. The secondary startup here is defined as: when the AC (AC) input terminal of the switching power supply is always connected to the AC line voltage port, that is, the voltage of the power supply pin VCC of the switching power supply controller is kept between VCCON and VCCOFF (wherein, When the power supply pin voltage is higher than the VCCON voltage, the switching power supply controller starts to work; on the contrary, when the power supply pin VCC voltage is lower than the VCCOFF voltage, the switching power supply controller stops working), and the switching power supply controller restarts due to abnormal output. Start-up, that is, the switching power supply controller usually works in the so-called "hiccup" mode, and the start-up in this ca...

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Abstract

The invention discloses a secondary startup control circuit and a switching power supply. The secondary startup control circuit comprises an under-voltage lock, a startup state register, an electrified restorer, an oscillator, a delay counter and a logic and gate. The circuit can reduce AC input power when secondary output of the switching power supply is in short circuit, enhance safety and reliability of the switching power supply, and save energy.

Description

technical field [0001] The invention mainly relates to the field of circuits, in particular to a secondary start control circuit of an analog switching power supply controller and a switching power supply. Background technique [0002] Today, switching power supplies are widely used because of their high power conversion efficiency. Safety and reliability are an important indicator of switching power supplies; one of them is output short-circuit protection. All AC-DC (AC to DC) switching power supply controllers All must have the function of output short-circuit protection; the output short-circuit protection of switching power supply controllers on the market can be divided into two types: latch mode and non-latch mode. , turn off the drive output, the switching power supply controller itself will not restart, it is necessary to disconnect the AC (alternating current) input power supply and the AC input terminal of the converter for a period of time, and then restore the co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M1/36H02H7/12
Inventor 朱樟明任智谋
Owner 西安民展通讯科技有限公司
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