CN204046162U - A kind of anti-back flow circuit of large power supply - Google Patents
A kind of anti-back flow circuit of large power supply Download PDFInfo
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- CN204046162U CN204046162U CN201420422818.8U CN201420422818U CN204046162U CN 204046162 U CN204046162 U CN 204046162U CN 201420422818 U CN201420422818 U CN 201420422818U CN 204046162 U CN204046162 U CN 204046162U
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- power supply
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- 239000004065 semiconductor Substances 0.000 claims abstract description 7
- 238000003032 molecular docking Methods 0.000 claims abstract description 6
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000012163 sequencing technique Methods 0.000 abstract 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of anti-back flow circuit of large power supply, described anti-back flow circuit comprises power MOS pipe 1, power MOS pipe 2, control circuit, sequential control circuit, under-voltage over-voltage locking circuit and RC delay circuit, wherein, source electrode " back-to-back " docking of power MOS pipe 1 and power MOS pipe 2, sequential control circuit, under-voltage over-voltage locking circuit are all connected to the control chip of control circuit, the output of control chip connects the source node of two power MOS pipes, and RC delay circuit connects two power MOS pipes respectively.This anti-back flow circuit drives two power MOS pipes by control circuit, two metal-oxide-semiconductor source electrode docking, effectively prevent electric current from pouring in down a chimney, when ensureing that short circuit appears in power output end by the control of control circuit, power MOS pipe can not burn, also there is power source internal sequencing control, over-voltage locking and undervoltage lookout function simultaneously, effectively ensure that the reliability and stability of large power supply.
Description
Technical field
The utility model relates to a kind of circuit, specifically a kind of anti-back flow circuit of large power supply.
Background technology
The power-supply system with redundancy feature is generally adopted in high-end server product, and require that electric power outputting current is larger, during normal work, all power supply plates are system power supply jointly, and when wherein one or a few power supply plate breaks down, remaining power supply plate will bear all loads, and realize these and need the output of each power module to be provided with anti-back flow circuit.
No matter the high-performance redundant power supply being applied to the occasions such as high-end server is in normal or abnormality, and anti-back flow circuit is all absolutely necessary.The easy anti-back flow circuit of tradition is made up of one or several diode, is not suitable for using in the power supply of High-current output; Along with the development of integrated circuit technology, can by larger electric current when power MOS pipe normally works, for its use in large power supply is had laid a good foundation, the control class IC technology device that Linear, Maxim company produces simultaneously reaches its maturity, and these facilitate the development of the anti-back flow circuit in large power supply all greatly.
Use the anti-back flow circuit of power MOS pipe composition, can control by convenient and simple carrying out, and the requirement of High-current output can be met, but very easily burnt when abnormal conditions such as power supply use side are short-circuited, and lack some under-voltage and over-voltage locking functions, greatly reduce reliability and the stability of power source integral.
Utility model content
The utility model proposes a kind of anti-back flow circuit of large power supply, can be applied in large power supply, prevent power output end electric current from pouring in down a chimney.
The anti-back flow circuit of large power supply described in the utility model, its technical scheme is as follows: described anti-back flow circuit comprises power MOS pipe 1, power MOS pipe 2, control circuit and RC delay circuit, wherein, one end of power MOS pipe 1 is connected to power source internal output, one end of power MOS pipe 2 is connected to power output end, source electrode " back-to-back " docking of power MOS pipe 1 and power MOS pipe 2, drives two power MOS pipes by control circuit; Control circuit comprises a control chip, the input of control chip connects power source internal output, the output of control chip connects the source node place of power MOS pipe 1 and power MOS pipe 2, and the output of RC delay circuit connects power MOS pipe 1 and power MOS pipe 2 respectively; When control chip detects that the drain voltage of power MOS pipe 1 is greater than its source voltage, control chip can open power MOS pipe 1 and power MOS pipe 2 simultaneously, and power supply can normally externally export; RC delay circuit parameter need Reasonable adjustment, when short circuit appears in power output end, slow down the decrease speed of the gate-source voltage of power MOS pipe, guaranteed output metal-oxide-semiconductor is not burnt.
The beneficial effect that the anti-back flow circuit of a kind of large power supply described in the utility model has: the anti-back flow circuit of this large power supply, can be used in high-power redundant power, two power MOS pipes are driven by control circuit, the requirement of High-current output can be met, the docking form of two metal-oxide-semiconductor source electrodes " back-to-back ", prevent electric current from being poured in down a chimney by the body diode of power MOS pipe, can when there is short-circuit conditions in power output end by the control of control circuit, diode can be turned off rapidly, simultaneously guaranteed output metal-oxide-semiconductor can not because of moment larger electric current and burning, the control of power source internal sequential can also be realized simply and easily by control circuit, also there is over-voltage locking and undervoltage lookout function simultaneously, therefore, by anti-back flow circuit described in the utility model, can prevent power supply inside and outside differential pressure from causing electric current to pour in down a chimney and damaging power supply, effectively ensure that the reliability and stability of large power supply.
Accompanying drawing explanation
Accompanying drawing 1 is the structured flowchart of the anti-back flow circuit of described large power supply.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, hereinafter will by reference to the accompanying drawings, the anti-back flow circuit of a kind of large power supply of the present utility model is described in detail.
Embodiment:
Below by an embodiment, excellent to the anti-back flow circuit of a kind of large power supply of the present invention
Point and design content, be described in detail.
The anti-back flow circuit of large power supply described in the present embodiment, has short-circuit protection function, can be used in high-power redundant power, prevents power supply inside and outside differential pressure from causing electric current pour in down a chimney and damage power supply.As shown in Figure 1, described anti-back flow circuit comprises power MOS pipe 1, power MOS pipe 2, control circuit and RC delay circuit, wherein, one end of power MOS pipe 1 is connected to power source internal output, one end of power MOS pipe 2 is connected to power output end, source electrode " back-to-back " docking of power MOS pipe 1 and power MOS pipe 2, drives two power MOS pipes by control circuit; Control circuit comprises a control chip, the input of control chip connects power source internal output, the output of control chip connects the source node place of power MOS pipe 1 and power MOS pipe 2, and the output of RC delay circuit connects power MOS pipe 1 and power MOS pipe 2 respectively.
In the present embodiment, described control chip adopts the LTC4352 of Linear company, when control chip detects that the drain voltage of power MOS pipe 1 is greater than its source voltage, control chip can open power MOS pipe 1 and power MOS pipe 2 simultaneously, now power supply can normally externally export, power MOS pipe 1 docks with power MOS pipe 2 " back-to-back ", solves the problem that single power MOS pipe body diode leaks.RC delay circuit parameter can Reasonable adjustment, when can ensure that short-circuit conditions appears in power output end, slow down the decrease speed of the gate-source voltage of power MOS pipe, guaranteed output metal-oxide-semiconductor is not burnt, simultaneously again can the opening speed of guaranteed output metal-oxide-semiconductor can not be excessively slow.
In addition, in the anti-back flow circuit of the large power supply of the present embodiment, described anti-back flow circuit also includes sequential control circuit, the output of sequential control circuit connects described control chip, and connect power MOS pipe 2 by the voltage output end of control chip, and power MOS pipe 2 is connected to power output end.Like this, when externally the sequential control circuit that outside is built can control power supply output voltage easily by the voltage output end of control chip.
Meanwhile, be also provided with undervoltage lockout circuit and over-voltage locking circuit in the anti-back flow circuit of described large power supply, undervoltage lockout circuit and over-voltage locking circuit are all connected to described control chip.Whether undervoltage lockout circuit and over-voltage locking circuit are used for monitoring power supply builtin voltage and export normal, if there is abnormal external output of cutting off the electricity supply voluntarily, further increase the reliability and stability of power supply.
Above-mentioned embodiment is only concrete case of the present invention; scope of patent protection of the present utility model includes but not limited to above-mentioned embodiment; any meet claims of the present utility model and any person of an ordinary skill in the technical field to its suitable change done or replacement, all should fall into scope of patent protection of the present invention.
Claims (3)
1. the anti-back flow circuit of a large power supply, it is characterized in that, described anti-back flow circuit comprises power MOS pipe 1, power MOS pipe 2, control circuit and RC delay circuit, wherein, one end of power MOS pipe 1 is connected to power source internal output, one end of power MOS pipe 2 is connected to power output end, and the source electrode docking of power MOS pipe 1 and power MOS pipe 2, drives two power MOS pipes by control circuit; Control circuit comprises a control chip, the input of control chip connects power source internal output, the output of control chip connects the source node place of power MOS pipe 1 and power MOS pipe 2, and the output of RC delay circuit connects power MOS pipe 1 and power MOS pipe 2 respectively; When control chip detects that the drain voltage of power MOS pipe 1 is greater than its source voltage, control chip can open power MOS pipe 1 and power MOS pipe 2 simultaneously, and power supply normally externally exports; RC delay circuit parameter need Reasonable adjustment, when short circuit appears in power output end, slow down the decrease speed of the gate-source voltage of power MOS pipe, guaranteed output metal-oxide-semiconductor is not burnt.
2. the anti-back flow circuit of a kind of large power supply according to claim 1, it is characterized in that, also sequential control circuit is comprised in the anti-back flow circuit of described large power supply, the output of sequential control circuit connects described control chip, and connect power MOS pipe 2 by the voltage output end of control chip, and power MOS pipe 2 is connected to power output end; Namely when externally sequential control circuit controls power supply output voltage by the voltage output end of control chip.
3. the anti-back flow circuit of a kind of large power supply according to claim 2, it is characterized in that, also be provided with undervoltage lockout circuit and over-voltage locking circuit in the anti-back flow circuit of described large power supply, undervoltage lockout circuit and over-voltage locking circuit are all connected to described control chip; Whether undervoltage lockout circuit and over-voltage locking circuit are used for monitoring power supply builtin voltage and export normal, if there is abnormal external output of cutting off the electricity supply voluntarily.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420422818.8U CN204046162U (en) | 2014-07-30 | 2014-07-30 | A kind of anti-back flow circuit of large power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420422818.8U CN204046162U (en) | 2014-07-30 | 2014-07-30 | A kind of anti-back flow circuit of large power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204046162U true CN204046162U (en) | 2014-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420422818.8U Expired - Fee Related CN204046162U (en) | 2014-07-30 | 2014-07-30 | A kind of anti-back flow circuit of large power supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN204046162U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703615A (en) * | 2016-04-13 | 2016-06-22 | 浪潮集团有限公司 | Anti-flow-backward design method for DC power supply redundant circuit |
| CN109613968A (en) * | 2018-12-06 | 2019-04-12 | 华东计算技术研究所（中国电子科技集团公司第三十二研究所） | Power supply redundant output circuit with short-circuit protection |
-
2014
- 2014-07-30 CN CN201420422818.8U patent/CN204046162U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703615A (en) * | 2016-04-13 | 2016-06-22 | 浪潮集团有限公司 | Anti-flow-backward design method for DC power supply redundant circuit |
| CN109613968A (en) * | 2018-12-06 | 2019-04-12 | 华东计算技术研究所（中国电子科技集团公司第三十二研究所） | Power supply redundant output circuit with short-circuit protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141224 Termination date: 20160730 |