CN109217241A - A kind of device and method for preventing reverse current from leading to overshoot voltage - Google Patents
A kind of device and method for preventing reverse current from leading to overshoot voltage Download PDFInfo
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- CN109217241A CN109217241A CN201811207542.0A CN201811207542A CN109217241A CN 109217241 A CN109217241 A CN 109217241A CN 201811207542 A CN201811207542 A CN 201811207542A CN 109217241 A CN109217241 A CN 109217241A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/18—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to reversal of direct current
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Abstract
The invention discloses a kind of device and methods for preventing reverse current from leading to overshoot voltage, are related to electronic technology field.Device includes current-sensing circuit, current comparison circuit and overvoltage crowbar；The input terminal of current-sensing circuit is connect with voltage follower circuit, for circuit for detecting electric current, determines current direction；The input terminal of current comparison circuit and the both ends of current-sensing circuit connect, and for being compared by the voltage value to current-sensing circuit both ends, determine to overvoltage crowbar and export high level or low level；The input terminal of overvoltage crowbar and the output end of current comparison circuit connect, and output end is connect with voltage follower circuit, realize overvoltage protection for the input voltage by dragging down voltage follower circuit.The present invention is compared by using voltage of the comparator to resistance both ends, and is acted according to current status, it is ensured that is protected before reverse current reaches input terminal, realizes detecting, threshold value stabilization, high reliablity, willing effect in advance.
Description
Technical field
The present embodiments relate to electronic technology fields, and in particular to a kind of dress for preventing reverse current from leading to overshoot voltage
It sets and method.
Background technique
Electronic equipment will guarantee the stabilization of its supply voltage in use, the case where if there is over-voltage, it is likely that
The electronic component that will lead in circuit is breakdown, to cause the damage of electronic equipment, therefore, the overvoltage protection of circuit is especially closed
Key.
In the relevant electronic equipment of existing server, overvoltage circuit protective module is all to utilize the anti-of Schottky diode
It is realized to breakdown function, over-voltage is only just able to achieve when voltage is more than the breakdown reverse voltage of Schottky diode and is protected
Shield.It has the disadvantage that the reverse breakdown characteristics of Schottky diode are not sufficiently stable, and floating range is big, the reaction time
It is long and expensive.Especially when abnormity of power supply turns off, since input voltage declines rapidly, and output voltage is acted in capacitor
Under remain unchanged, to generate reverse current, the shutdown for controlling integrated circuit at this time can allow reverse current to generate overvoltage impact.
In addition, existing server chips, which uniquely rely on Schottky diode, carries out overvoltage protection, not targeted function setting.
Based on above-mentioned the shortcomings of the prior art, the present invention proposes a kind of dress for preventing reverse current from leading to overshoot voltage
It sets and method, avoids generating impact to circuit since reverse current generates overshoot voltage, it is ensured that circuit reliability of operation.
Summary of the invention
The embodiment of the present invention provides a kind of device and method for preventing reverse current from leading to overshoot voltage, solves existing over-voltage
Protect the problem that over-voltage existing for circuit is unstable and the reaction time is long.
In order to solve the above technical problems, the invention discloses following technical solutions:
First aspect present invention provides a kind of device for preventing reverse current from leading to overshoot voltage, and described device includes packet
Include current-sensing circuit, current comparison circuit and overvoltage crowbar；
The input terminal of the current-sensing circuit is connect with voltage follower circuit, and output end is connect with current comparison circuit,
For circuit for detecting electric current, determine sense of current；
The input terminal of the current comparison circuit and the both ends of current-sensing circuit connect, output end and overvoltage crowbar
Connection, it is determining to overvoltage crowbar output high level or low for being compared by the voltage value to current-sensing circuit both ends
Level；
The input terminal of the overvoltage crowbar is connect with current comparison circuit, and output end is connect with voltage follower circuit,
For the input voltage by dragging down voltage follower circuit, overvoltage protection is realized.
Based on above scheme, the present apparatus does following optimization:
Preferably, the current-sensing circuit includes resistance R1, defeated using resistance R1 after current-sensing circuit accesses circuit
Voltage difference between outlet and input terminal determines sense of current.
Preferably, the current comparison circuit includes comparator M1, the output of the positive input terminal and resistance R1 of comparator M1
The input terminal of end connection, negative input end and resistance R1 connects, and the output end of comparator M1 and the input terminal of overvoltage crowbar connect
It connects, if the input terminal voltage of resistance R1 is higher than output end voltage, M1 exports low level to overvoltage crowbar；Conversely, M1 to
Overvoltage crowbar exports high level.
Further, preferably, the overvoltage crowbar includes N-type metal-oxide-semiconductor field effect transistor Q1 and diode D1, two poles
Pipe D1 is connect with the drain electrode of field-effect tube Q1, and when comparator M1 exports low level, field-effect tube Q1 cut-off, diode D1 is not connect
Enter circuit；When comparator M1 exports high level, field-effect tube Q1 conducting, diode D1 access circuit simultaneously drags down voltage output electricity
The input voltage on road.
Second aspect of the present invention provides a kind of method for preventing reverse current from leading to overshoot voltage, the method includes with
Lower step:
The current sense that circuit is carried out by current-sensing circuit, determines current direction；
The both ends of current-sensing circuit are connect with current comparison circuit, by current comparison circuit to current-sensing circuit
The voltage value at both ends compares, and determines and exports high and low level；
The output end of current comparison circuit is connect with overvoltage crowbar, voltage output is dragged down by overvoltage crowbar
The input voltage of circuit realizes overvoltage protection.
Further, the input terminal of the current-sensing circuit is connect with voltage follower circuit, including resistance R1, electric current are detectd
Slowdown monitoring circuit determines sense of current by the voltage difference between resistance R1 output end and input terminal.
Further, the both ends of the input terminal of the current comparison circuit and current-sensing circuit connect, including comparator
The positive input terminal of M1, comparator M1 connect with the output end of resistance R1, the input terminal of negative input end and resistance R1 connect, comparator
The output end of M1 and the input terminal of overvoltage crowbar connect, if the input terminal voltage of resistance R1 is higher than output end voltage, M1
Low level is exported to overvoltage crowbar；Conversely, M1 exports high level to overvoltage crowbar.
A kind of method for preventing reverse current from leading to overshoot voltage as described above, the output end of the overvoltage crowbar
It is connect with voltage follower circuit, including N-type metal-oxide-semiconductor field effect transistor Q1 and diode D1, the drain electrode of diode D1 and field-effect tube Q1
Connection, when comparator M1 exports low level, field-effect tube Q1 cut-off, diode D1 does not access circuit；When comparator M1 is exported
When high level, field-effect tube Q1 conducting, diode D1 accesses circuit and drags down the input voltage of voltage follower circuit, realizes over-voltage
Protection.
Embodiments herein provide technical solution include it is following the utility model has the advantages that
A kind of device for preventing reverse current from leading to overshoot voltage provided by the embodiments of the present application, including current sense electricity
Road, current comparison circuit and overvoltage crowbar；The input terminal of current-sensing circuit is connect with voltage follower circuit, for detecting
Circuital current determines sense of current；The input terminal of current comparison circuit and the both ends of current-sensing circuit connect, for passing through
The voltage value at current-sensing circuit both ends is compared, determines to overvoltage crowbar and exports high level or low level；Overvoltage protection
The input terminal of circuit and the output end of current comparison circuit connect, and output end is connect with voltage follower circuit, for by dragging down
The input voltage of voltage follower circuit realizes overvoltage protection.The embodiment of the present application prevents reverse current from leading to overshoot voltage
Device is compared by using voltage of the comparator to resistance both ends and is acted according to current status, it is ensured that reversed
Electric current is protected before really reaching input terminal, when solving unstable over-voltage existing for existing overvoltage crowbar and reaction
Between long problem, realize detecting, threshold value stabilization, high reliablity, willing effect in advance.
What first aspect present invention provided prevents reverse current from leading to the device of overshoot voltage, can be realized second aspect
It prevents reverse current from leading to the method for overshoot voltage, and obtains identical effect.
Detailed description of the invention
The drawings herein are incorporated into the specification and constitutes part of specification, shows the implementation for meeting the application
Example, and together with specification it is used to explain the principle of the application.
Fig. 1 is a kind of apparatus structure schematic diagram for preventing reverse current from leading to overshoot voltage provided by the embodiments of the present application；
Fig. 2 is the device circuit figure for preventing reverse current from leading to overshoot voltage in Fig. 1；
Fig. 3 is a kind of method flow schematic diagram for preventing reverse current from leading to overshoot voltage provided by the embodiments of the present application；
Appended drawing reference:
1- current-sensing circuit, 2- current comparison circuit, 3- overvoltage crowbar.
Specific embodiment
To make those skilled in the art more fully understand the technical solution in the present invention, implement below in conjunction with the present invention
Attached drawing in example, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work all should belong to what the present invention protected
Range.
Fig. 1, Fig. 2 are respectively a kind of apparatus structure for preventing reverse current from leading to overshoot voltage provided by the embodiments of the present application
Schematic diagram and circuit diagram.As shown in Figure 1, the present embodiment prevents the reverse current from the device of overshoot voltage being caused to include current sense
Circuit 1, current comparison circuit 2 and overvoltage crowbar 3；The input terminal of current-sensing circuit 1 is connect with voltage follower circuit, is used
In circuit for detecting electric current, determine sense of current；The input terminal of current comparison circuit 2 and the both ends of current-sensing circuit connect,
For being compared by the voltage value to current-sensing circuit both ends, determines to overvoltage crowbar and export high level or low level；
The input terminal of overvoltage crowbar 3 and the output end of current comparison circuit connect, and output end connect with voltage follower circuit, is used for
By dragging down the input voltage of voltage follower circuit, overvoltage protection is realized.
Specifically, as shown in Fig. 2, current-sensing circuit 1 is made of resistance R1, after current-sensing circuit 1 accesses circuit, benefit
Sense of current is determined with the voltage difference between resistance R1 output end and input terminal.Current comparison circuit 2 is made of comparator M1,
The positive input terminal of comparator M1 is connect with the output end of resistance R1, and the negative input end of comparator M1 and the input terminal of resistance R1 connect
It connects, the output end of comparator M1 and the input terminal of overvoltage crowbar connect.Comparator M1 compares the voltage at resistance both ends
Compared with if the input terminal voltage of resistance R1 is higher than output end voltage, M1 exports low level to overvoltage crowbar；If resistance R1's
Input terminal voltage is lower than output end voltage, and M1 exports high level to overvoltage crowbar.
Further, overvoltage crowbar 3 is by N-type metal-oxide-semiconductor field effect transistor Q1 and diode D1, diode D1 and field-effect tube
The drain electrode of Q1 connects, and when comparator M1 exports low level, field-effect tube Q1 cut-off, diode D1 does not access circuit；When comparing
When device M1 exports high level, field-effect tube Q1 conducting, diode D1 accesses circuit and drags down the input voltage of voltage follower circuit.
The present embodiment prevents reverse current from leading to the device of overshoot voltage, carries out by using voltage of the comparator M1 to resistance both ends
Compare and acted according to current status, it is ensured that protected before reverse current really reaches input terminal, avoid because
Overshoot voltage damages electronic equipment.
Fig. 3 is a kind of method flow schematic diagram for preventing reverse current from leading to overshoot voltage provided by the embodiments of the present application,
From the figure 3, it may be seen that the present embodiment prevent reverse current cause overshoot voltage method the following steps are included:
S1, the current sense that circuit is carried out by current-sensing circuit, determine current direction；
S2, the both ends of current-sensing circuit are connect with current comparison circuit, by current comparison circuit to current sense
The voltage value at circuit both ends compares, and determines and exports high and low level；
S3, the output end of current comparison circuit is connect with overvoltage crowbar, voltage is dragged down by overvoltage crowbar
The input voltage of output circuit realizes overvoltage protection.
Specifically, the input terminal of current-sensing circuit is connect with voltage follower circuit, including electricity in the step S1
R1 is hindered, current-sensing circuit determines sense of current by the voltage difference between resistance R1 output end and input terminal.The step
In rapid S2, the input terminal of current comparison circuit and the both ends of current-sensing circuit are connected, including comparator M1, and comparator M1 is just
Input terminal connect with the output end of resistance R1, the input terminal of negative input end and resistance R1 connect, the output end and mistake of comparator M1
The input terminal of voltage protection circuit connects, if the input terminal voltage of resistance R1 is higher than output end voltage, M1 is to overvoltage crowbar
Export low level；Conversely, M1 exports high level to overvoltage crowbar.In the step S3, the output of overvoltage crowbar
End is connect with voltage follower circuit, including N-type metal-oxide-semiconductor field effect transistor Q1 and diode D1, the leakage of diode D1 and field-effect tube Q1
Pole connection, when comparator M1 exports low level, field-effect tube Q1 cut-off, diode D1 does not access circuit；When comparator M1 is defeated
Out when high level, field-effect tube Q1 conducting, diode D1 accesses circuit and drags down the input voltage of voltage follower circuit, realizes
Pressure protection.
The above is only a specific embodiment of the invention, is made skilled artisans appreciate that or realizing this hair
It is bright.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. a kind of device for preventing reverse current from leading to overshoot voltage, which is characterized in that compare including current-sensing circuit, electric current
Circuit and overvoltage crowbar；
The input terminal of the current-sensing circuit is connect with voltage follower circuit, for circuit for detecting electric current, determines the side of electric current
To；
The input terminal of the current comparison circuit and the both ends of current-sensing circuit connect, for by current-sensing circuit two
The voltage value at end compares, and determines to overvoltage crowbar and exports high level or low level；
The input terminal of the overvoltage crowbar and the output end of current comparison circuit connect, and output end and voltage follower circuit connect
It connects, for the input voltage by dragging down voltage follower circuit, realizes overvoltage protection.
2. a kind of device for preventing reverse current from leading to overshoot voltage according to claim 1, which is characterized in that the electricity
Stream circuit for detecting includes that resistance R1 utilizes the electricity between resistance R1 output end and input terminal after current-sensing circuit accesses circuit
Pressure difference determines sense of current.
3. a kind of device for preventing reverse current from leading to overshoot voltage according to claim 2, which is characterized in that the electricity
Stream comparison circuit includes comparator M1, and the positive input terminal of comparator M1 connect with the output end of resistance R1, negative input end and resistance
The input terminal of R1 connects, and the output end of comparator M1 and the input terminal of overvoltage crowbar connect, if the input terminal electricity of resistance R1
Pressure is higher than output end voltage, then M1 exports low level to overvoltage crowbar；Conversely, M1 exports high electricity to overvoltage crowbar
It is flat.
4. a kind of device for preventing reverse current from leading to overshoot voltage according to claim 3, which is characterized in that the mistake
Voltage protection circuit includes N-type metal-oxide-semiconductor field effect transistor Q1 and diode D1, and diode D1 is connect with the drain electrode of field-effect tube Q1, when than
When exporting low level compared with device M1, field-effect tube Q1 cut-off, diode D1 does not access circuit；When comparator M1 exports high level,
Field-effect tube Q1 conducting, diode D1 access circuit and the input voltage for dragging down voltage follower circuit.
5. a kind of method for preventing reverse current from leading to overshoot voltage, which comprises the following steps:
The current sense that circuit is carried out by current-sensing circuit, determines current direction；
The both ends of current-sensing circuit are connect with current comparison circuit, by current comparison circuit to current-sensing circuit both ends
Voltage value compare, determine and export high and low level；
The output end of current comparison circuit is connect with overvoltage crowbar, voltage follower circuit is dragged down by overvoltage crowbar
Input voltage, realize overvoltage protection.
6. a kind of method for preventing reverse current from leading to overshoot voltage according to claim 5, which is characterized in that the electricity
The input terminal of stream circuit for detecting is connect with voltage follower circuit, including resistance R1, and current-sensing circuit passes through resistance R1 output end
Voltage difference between input terminal determines sense of current.
7. a kind of method for preventing reverse current from leading to overshoot voltage according to claim 6, which is characterized in that the electricity
The both ends of the input terminal and current-sensing circuit that flow comparison circuit connect, including comparator M1, the positive input terminal of comparator M1 with
The output end connection of resistance R1, the input terminal of negative input end and resistance R1 connect, output end and the overvoltage protection electricity of comparator M1
The input terminal on road connects, if the input terminal voltage of resistance R1 is higher than output end voltage, M1 exports low electricity to overvoltage crowbar
It is flat；Conversely, M1 exports high level to overvoltage crowbar.
8. a kind of method for preventing reverse current from leading to overshoot voltage according to claim 7, which is characterized in that the mistake
The output end of voltage protection circuit is connect with voltage follower circuit, including N-type metal-oxide-semiconductor field effect transistor Q1 and diode D1, diode D1
It is connect with the drain electrode of field-effect tube Q1, when comparator M1 exports low level, field-effect tube Q1 cut-off, diode D1 does not access electricity
Road；When comparator M1 exports high level, field-effect tube Q1 conducting, diode D1 access circuit simultaneously drags down voltage follower circuit
Input voltage realizes overvoltage protection.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811207542.0A CN109217241A (en) | 2018-10-17 | 2018-10-17 | A kind of device and method for preventing reverse current from leading to overshoot voltage |
| PCT/CN2019/089284 WO2020078006A1 (en) | 2018-10-17 | 2019-05-30 | Device and method for preventing overshoot voltage caused by reverse current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811207542.0A CN109217241A (en) | 2018-10-17 | 2018-10-17 | A kind of device and method for preventing reverse current from leading to overshoot voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109217241A true CN109217241A (en) | 2019-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811207542.0A Pending CN109217241A (en) | 2018-10-17 | 2018-10-17 | A kind of device and method for preventing reverse current from leading to overshoot voltage |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109217241A (en) |
| WO (1) | WO2020078006A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020078006A1 (en) * | 2018-10-17 | 2020-04-23 | 郑州云海信息技术有限公司 | Device and method for preventing overshoot voltage caused by reverse current |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887973A (en) * | 2012-12-24 | 2014-06-25 | 中兴通讯股份有限公司 | Method and system controlling reverse current to generate power tube voltage stress |
| CN104092388A (en) * | 2014-06-17 | 2014-10-08 | 昆山弗尔赛能源有限公司 | Synchronous rectifying BOOST circuit with reverse current prevention |
| CN206834717U (en) * | 2017-06-19 | 2018-01-02 | 深圳市证通电子股份有限公司 | A kind of direct current current foldback circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204156500U (en) * | 2014-10-10 | 2015-02-11 | 深圳市英威腾电气股份有限公司 | Overcurrent-overvoltage protecting circuit |
| US9853467B2 (en) * | 2015-01-13 | 2017-12-26 | Intersil Americas LLC | Overcurrent protection in a battery charger |
| CN109217241A (en) * | 2018-10-17 | 2019-01-15 | 郑州云海信息技术有限公司 | A kind of device and method for preventing reverse current from leading to overshoot voltage |
-
2018
- 2018-10-17 CN CN201811207542.0A patent/CN109217241A/en active Pending
-
2019
- 2019-05-30 WO PCT/CN2019/089284 patent/WO2020078006A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887973A (en) * | 2012-12-24 | 2014-06-25 | 中兴通讯股份有限公司 | Method and system controlling reverse current to generate power tube voltage stress |
| CN104092388A (en) * | 2014-06-17 | 2014-10-08 | 昆山弗尔赛能源有限公司 | Synchronous rectifying BOOST circuit with reverse current prevention |
| CN206834717U (en) * | 2017-06-19 | 2018-01-02 | 深圳市证通电子股份有限公司 | A kind of direct current current foldback circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020078006A1 (en) * | 2018-10-17 | 2020-04-23 | 郑州云海信息技术有限公司 | Device and method for preventing overshoot voltage caused by reverse current |
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| Publication number | Publication date |
|---|---|
| WO2020078006A1 (en) | 2020-04-23 |
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Application publication date: 20190115 |