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Buck type dc/dc converter circuit with anti-ringing block circuit

An anti-ringing and circuit technology, applied in the direction of output power conversion devices, instruments, electrical components, etc., can solve problems such as affecting the work of the chip, and achieve the effects of reducing chip area, reducing cost, and novel design

Active Publication Date: 2020-04-03
昌芯(西安)集成电路科技有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, the ringing formed at the SW end of DCM mode in light-load applications generally lasts for a long time, so that it is possible to transmit high-frequency signals to the The whole system affects the normal operation of the chip

Method used

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  • Buck type dc/dc converter circuit with anti-ringing block circuit
  • Buck type dc/dc converter circuit with anti-ringing block circuit
  • Buck type dc/dc converter circuit with anti-ringing block circuit

Examples

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Embodiment Construction

[0026] Such as figure 2 As shown, the Buck DC / DC converter circuit with anti-ringing module circuit includes at least: anti-ringing module circuit 101, logic drive circuit 102, power MOS tube 103, LC filter circuit and load 104, LC filter circuit and The load 104 is electrically connected to the output end of the power MOS tube 103, and the anti-ringing module circuit 101 is electrically connected to the power MOS tube 103 through the logic driving circuit 102.

[0027] The anti-ringing module circuit 101 and the logic drive circuit 102 at least include a zero-crossing comparison signal ZCD detection terminal and a mode selection signal Mode terminal that are electrically connected.

[0028] The anti-ringing module circuit 101 includes an oscillator clock module 101_1, a charge pump module 101_2, a high voltage level shift module 101_3, and a high voltage NMOS tube M SW The oscillator clock module 101_1, the charge pump module 101_2, the high voltage level shift module 101_3 and t...

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Abstract

The present invention discloses a buck type DC / DC convertor circuit with an anti-ringing modular circuit. The anti-ringing modular circuit is integrated into a chip, and comprises an oscillator clockmodule, a charge pump module, a high-voltage level shift module and a high-voltage NMOS tube MSW. The operating principle of the system comprises that: under a light-load application, when an induction current when a DC / DC convertor works is smaller than 0, the system enters a DCM working mode, at the moment, upper and lower power tubes MTOP and MBOT are disconnected, internal logic signals ZCD and Mode enables the anti-ringing modular circuit, the high-voltage NMOS tube MSW is controlled to perform short circuit of an inductor so as to switch off an LC oscillation circuit so as to avoid generation of a ringing phenomenon when the DCM works in light-load and allow the system to be stable in a full load application. The NMOS tube is commonly used as a switching device and has advantages atthe aspects of the on resistance, the response time and the manufacturing process. The concept is novel, the application range is wide, and the practicability is high.

Description

Technical field [0001] The invention belongs to the field of switching power supplies, and particularly relates to a Buck type DC / DC converter circuit with an anti-ringing module circuit. Background technique [0002] DC / DC converters have the advantages of high integration, high efficiency, and wide voltage regulation range, so they are widely used in various electronic communications and other technical fields. The Buck DC / DC converter is a DC voltage converter whose output voltage is less than the input voltage. [0003] Nowadays, most electronic devices are in idle standby state for most of the time. For Buck DC / DC converters, it is necessary to ensure high stability and high efficiency under no-load and light-load conditions. In practice, although the DCM mode is used to improve the no-load and light-load efficiency, the LC resonance is inevitably triggered, and a ringing phenomenon occurs, which may cause the circuit to work abnormally. Current anti-ringing circuits mostly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02M1/088H02M1/32
CPCH02M1/088H02M1/32H02M3/158
Inventor 符皓吴雷唐文海王夏莲于长存代国定
Owner 昌芯(西安)集成电路科技有限责任公司
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