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Circuit for preventing converter from restarting after shutdown and corresponding converter

A DC converter and circuit technology, applied in the field of converters, can solve problems such as output voltage rebound and failure to meet timing requirements, and achieve the effect of improving reliability

Active Publication Date: 2018-08-10
SHENZHEN SAMSUNG COMM TECH RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, the output voltage rebounds during the decline process after shutdown, which cannot meet the timing requirements

Method used

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  • Circuit for preventing converter from restarting after shutdown and corresponding converter
  • Circuit for preventing converter from restarting after shutdown and corresponding converter
  • Circuit for preventing converter from restarting after shutdown and corresponding converter

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Such as figure 2 As shown, it shows the application circuit diagram of the first embodiment of a circuit that prevents the DC / DC converter from restarting after shutting down provided by the present invention; in this embodiment, the circuit is used for self-driven synchronous rectification DC / DC conversion device, which includes:

[0045] The shutdown signal processing circuit is used to connect the self-driven synchronous rectification DC / DC converter and receive the shutdown signal, which includes a first shutdown signal processing circuit and a second shutdown signal processing circuit, and the shutdown signal is passed through the first shutdown signal. The processing circuit obtains a first judgment signal, and the shutdown signal obtains a second judgment signal through the second shutdown signal processing circuit;

[0046] Judgment circuit, which has a first judgment input end, a second judgment input end and a judgment output end, when a shutdown signal occu...

Embodiment 2

[0058] Such as image 3 As shown, it shows the application circuit diagram of the second embodiment of the circuit that prevents the DC / DC converter from restarting after shutting down provided by the present invention; figure 2 The main difference of the illustrated first embodiment is that the shutdown signal comes from the soft start SS pin of the PWM main control circuit, but the judgment output terminal of the judgment circuit is connected to other pins. Its specific working principle and figure 2 The working principle of the circuit shown in is basically the same, and the foregoing description can be referred to together.

Embodiment 3

[0060] Such as Figure 4 Shown is an application circuit diagram of the third embodiment of a circuit for preventing a DC / DC converter from restarting after shutdown provided by the present invention. In this embodiment three, it is with image 3 The main difference of the second embodiment shown is that the shutdown signal is obtained from the undervoltage protection circuit in the DC / DC converter. Its specific working principle and image 3 The working principle of the circuit shown in is basically the same, and the foregoing description can be referred to together.

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PUM

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Abstract

The embodiment of the invention provides a circuit for preventing restarting of a converter after shutdown. After shutdown of a self-driven synchronous rectification direct-current / direct-current converter, a PWM main control circuit is locked immediately and time delay is kept for a period of time; within the time delay keeping time, even though a flowing backward phenomenon occurs at the direct-current / direct-current converter and thus an input voltage Vin boosts and is larger than that of an under-voltage protection releasing point, restarting of the direct-current / direct-current converter can be prevented. Meanwhile, the embodiment of the invention also provides a corresponding self-driven synchronous rectification direct-current / direct-current converter. Therefore, restarting caused by the flowing backward phenomenon of the direct-current / direct-current converter after shutdown can be avoided; and after shutdown, the output voltage can be reduced monotonically and no rebounding occurs, thereby improving reliability of the power supply.

Description

technical field [0001] The invention relates to a DC / DC converter, in particular to a circuit for preventing the converter from being restarted after shutdown and a corresponding converter. Background technique [0002] Synchronous rectification technology is widely used in low-voltage and high-current DC / DC converters. In this converter, MOSFETs are used instead of diodes for rectification, which can effectively reduce the on-state loss and improve the efficiency of the converter. In the self-driven synchronous rectification DC / DC converter, the voltage signal of the power winding or the auxiliary winding can be used as the corresponding excitation to drive the rectifier SR1 and the freewheeling tube SR2. Self-driven synchronous rectification has been widely used in low-voltage high-current DC / DC converters due to its simplicity and ease of use. [0003] Figure 1a It is a structural schematic diagram of a self-driven synchronous rectification DC / DC converter commonly used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M1/08H02H7/12
Inventor 唐志姚杰管成亮林勇健
Owner SHENZHEN SAMSUNG COMM TECH RES