CN102142681A - Method and device for preventing input reverse-connection damage - Google Patents
Method and device for preventing input reverse-connection damage Download PDFInfo
- Publication number
- CN102142681A CN102142681A CN 201010612461 CN201010612461A CN102142681A CN 102142681 A CN102142681 A CN 102142681A CN 201010612461 CN201010612461 CN 201010612461 CN 201010612461 A CN201010612461 A CN 201010612461A CN 102142681 A CN102142681 A CN 102142681A
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- current
- sense
- protected device
- controlled switch
- normal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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- Protection Of Static Devices (AREA)
Abstract
The invention discloses a device protection circuit comprising a protected device, a control circuit and a controlled switch, wherein the controlled switch is connected in series between the protected device and a power supply; the control circuit is connected with a controlled switch and used for interpreting whether the present current direction is the current direction of the protected device at normal work, if so, the control circuit enables the controlled switch to be on, and if not, the control circuit enables the controlled switch to be off. In the invention, the control circuit is used for interpreting whether the present current direction is the current direction of the protected device at normal work, if so, the control circuit enables the controlled switch to be on, and if not, the control circuit enables the controlled switch to be off, and thus, device damages caused by input reversal are avoided and user experience is enhanced.
Description
Technical field
The present invention relates to prevent that input from damaging technical field, particularly a kind of method and apparatus that prevents to import the reversal connection damage.
Background technology
Along with the continuous growth of communication service demand, the range of application of electronic devices and components also constantly enlarges.For making block terminal satisfy specific demand in the communication service, adopting usually increases jumbo electric capacity and realizes in block terminal.But because some electronic devices in the block terminal, as electric capacity, triode, IC (Integratedcircuit, surface-mounted integrated circuit) etc. the requirement that inserts direction is arranged, if reversal connection, then will cause components from being damaged, therefore, how reducing the components from being damaged that is caused by the input reversal connection progressively comes into one's own.
In the prior art, prevent to cause that by the electric capacity reversal connection it is example that electric capacity punctures with realization, as shown in Figure 1, in the electric capacity place in circuit, add diode, utilize the unidirectional on state characteristic of diode, when forward voltage is imported, electric current passes through the diode powering load, when reversal connection is imported, and not conducting of diode, this moment, electric capacity did not have electric current to flow through, and therefore can not cause the damage of electric capacity.
But, electric current can produce pressure drop about 0.6V because flowing through diode, and electric current is often very big in the practical application, all be that electric currents tens of, hundreds of peaces flow through, this moment, diode will produce very big pressure drop loss, thereby produce a large amount of heats, make in actual applications application equipment be difficult to the heat radiation.
Summary of the invention
The embodiment of the invention provides a kind of device protective circuit, to reduce the pressure drop loss that brings by adopting diode to prevent to import reversal connection to damage.Described technical scheme is as follows:
Described circuit comprises: protected device, control circuit, and controlled switch;
Described controlled switch is serially connected with between described protected device and the power supply;
Described control circuit links to each other with described controlled switch, whether be used for the current sense of current of interpretation is the sense of current of described protected device operate as normal, if the sense of current of described protected device operate as normal, then described control circuit makes described controlled switch conducting; If not the sense of current of described protected device operate as normal, then described control circuit makes the not conducting of described controlled switch.
Described controlled switch comprises any in relay, metal-oxide-semiconductor, silicon controlled rectifier, the contactor.
When described controlled switch was relay, described circuit also comprised the slow control device that opens;
Describedly slow open control device and be serially connected with between described control circuit and the described relay; be used for when described control circuit is discerned the current sense of current and is the sense of current of described protected device operate as normal; delay and open described relay, avoid the contact of described relay to kill by a pinch.
The embodiment of the invention also provides a kind of preventing to import the method that reversal connection damages, and described method comprises:
Obtain the current sense of current;
Judge whether the described current sense of current is the sense of current that makes the protected device operate as normal;
If the sense of current of described protected device operate as normal is then controlled the controlled switch conducting, make current electric current pass through protected device;
If not the sense of current of described protected device operate as normal, then control the not conducting of described controlled switch.
When described controlled switch is relay, describedly judge whether the described current sense of current is the sense of current that makes the protected device operate as normal; If the sense of current of described protected device operate as normal is then controlled the controlled switch conducting, current electric current is specifically comprised by protected device:
Judge whether the described current sense of current is the sense of current that makes the protected device operate as normal, if the sense of current of described protected device operate as normal, then described relay is slow to be opened, and makes current electric current pass through protected device.
The technical scheme that the embodiment of the invention provides, whether by the current sense of current of described control circuit interpretation is the sense of current of described protected device operate as normal, if the sense of current of described protected device operate as normal, then described control circuit makes described controlled switch conducting; If not the sense of current of described protected device operate as normal, then described control circuit makes the not conducting of described controlled switch, has avoided the components from being damaged that causes by the input reversal connection, has increased user experience.
Description of drawings
Fig. 1 is that the employing diode that provides in the background technology of the present invention prevents to import the circuit diagram that reversal connection damages;
Fig. 2 is a kind of device protective circuit that provides in the embodiment of the invention 1;
Fig. 3 is a kind of device protective circuit that provides in the embodiment of the invention 2;
Fig. 4 is a kind of method flow diagram that prevents to import the reversal connection damage that provides in the embodiment of the invention 3;
Fig. 5 is a kind of method flow diagram that prevents to import the reversal connection damage that provides in the embodiment of the invention 4.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment 1
As shown in Figure 2, the embodiment of the invention provides a kind of device protective circuit, and described circuit comprises: protected device 1, control circuit 2, and controlled switch 3;
Described controlled switch 3 is serially connected with between described protected device 1 and the power supply;
Described control circuit 2 links to each other with described controlled switch 3, whether be used for the current sense of current of interpretation is the sense of current of described protected device 1 operate as normal, if the sense of current of described protected device operate as normal, then described control circuit 2 makes described controlled switch conducting; If not the sense of current of described protected device operate as normal, then described control circuit 2 makes described controlled switch 3 not conductings.
Wherein, described controlled switch comprises any in relay, metal-oxide-semiconductor, silicon controlled rectifier, the contactor.
Whether the embodiment of the invention is the sense of current of described protected device 1 operate as normal by the current sense of current of described control circuit interpretation, if the sense of current of described protected device operate as normal, then described control circuit 2 makes described controlled switch conducting; If not the sense of current of described protected device operate as normal, then described control circuit 2 makes described controlled switch 3 not conductings, has avoided the components from being damaged that causes by the input reversal connection, has increased user experience.
Embodiment 2
As shown in Figure 3, the embodiment of the invention is that electric capacity 4, controlled switch are that relay 5 is an example with the protected device, and a kind of device protective circuit is provided, and described circuit comprises: electric capacity 4, and control circuit 2, relay 5, the slow control device 6 that opens:
Relay 5 is serially connected with between electric capacity 4 and the power supply; Describedly slow open control device 6 and be serially connected with between control circuit 2 and the described relay 5.
Described control circuit 2, whether be used for the current sense of current of interpretation is the sense of current of electric capacity 4 operate as normal, if the sense of current of electric capacity 4 operate as normal, then by the slow control device 6 slow relays 5 that open that open, make relay 5 conductings, current electric current passes through protected device; If not the sense of current of electric capacity 4 operate as normal, then described control circuit 2 does not open by slow that control device 6 is slow to open relay 5, makes relay 5 not conductings, makes described controlled switch 103 not conductings, and current electric current does not pass through protected device.
Wherein, the slow control device that opens can be used to realize making the slow any device that opens of relay for later in the prior art.
Whether the embodiment of the invention is the sense of current of described protected device 1 operate as normal by the current sense of current of described control circuit interpretation, if the sense of current of described protected device operate as normal, then described control circuit 2 makes described controlled switch conducting; If not the sense of current of described protected device operate as normal, then described control circuit 2 makes described controlled switch 3 not conductings, has avoided the components from being damaged that causes by the input reversal connection, has increased user experience.In addition, when described controlled switch was relay, the embodiment of the invention opened by slow that control device is slow to open described relay, avoids the contact of described relay to kill by a pinch.
Embodiment 3
As shown in Figure 4, the embodiment of the invention provides a kind of preventing to import the method that reversal connection damages, and this method comprises:
S301: obtain the current sense of current;
S302: judge whether the described current sense of current is the sense of current that makes the protected device operate as normal, if the sense of current of described protected device operate as normal is then carried out S303; If not the sense of current of described protected device operate as normal, then carry out S304;
S303: the conducting of control controlled switch makes current electric current pass through protected device;
S304: not conducting of control controlled switch.
Optionally, controlled switch can be relay, metal-oxide-semiconductor, silicon controlled rectifier, contactor.
The embodiment of the invention is by judging whether the described current sense of current is the sense of current that makes the protected device operate as normal; If the sense of current of described protected device operate as normal is then controlled the controlled switch conducting, make current electric current pass through protected device; If not the sense of current of described protected device operate as normal, the components from being damaged that causes by the input reversal connection has been avoided in then not conducting of described controlled switch, has increased user experience.
Embodiment 4
As shown in Figure 5, embodiment of the invention protected device is imported method that reversal connection damage for relay for example provides a kind of preventing for electric capacity, controlled switch, and this method comprises:
S401: obtain the current sense of current;
S402: judge whether the described current sense of current is the sense of current that makes the electric capacity operate as normal, if, then carry out S403, if not, S404 then carried out.
S403: described relay is slow to be opened, and makes current electric current pass through protected device;
S404: not conducting of control controlled switch.
The embodiment of the invention is by judging whether the described current sense of current is the sense of current that makes the protected device operate as normal; If the sense of current of described protected device operate as normal is then controlled the controlled switch conducting, make current electric current pass through protected device; If not the sense of current of described protected device operate as normal, the components from being damaged that causes by the input reversal connection has been avoided in then not conducting of described controlled switch, has increased user experience.In addition, when described controlled switch is relay, described relay is delayed open, avoid the contact of described relay to kill by a pinch.
All or part of content in the technical scheme that above embodiment provides can realize that its software program is stored in the storage medium that can read by software programming, storage medium for example: the hard disk in the computer, CD or floppy disk.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a device protective circuit is characterized in that, described circuit comprises: protected device, control circuit, and controlled switch;
Described controlled switch is serially connected with between described protected device and the power supply;
Described control circuit links to each other with described controlled switch, whether be used for the current sense of current of interpretation is the sense of current of described protected device operate as normal, if the sense of current of described protected device operate as normal, then described control circuit makes described controlled switch conducting; If not the sense of current of described protected device operate as normal, then described control circuit makes the not conducting of described controlled switch.
2. according to the described circuit of claim 1, it is characterized in that described controlled switch comprises any in relay, metal-oxide-semiconductor, silicon controlled rectifier, the contactor.
3. according to the described circuit of claim 1, it is characterized in that when described controlled switch was relay, described circuit also comprised the slow control device that opens;
Describedly slow open control device and be serially connected with between described control circuit and the described relay; be used for when described control circuit is discerned the current sense of current and is the sense of current of described protected device operate as normal; delay and open described relay, avoid the contact of described relay to kill by a pinch.
4. one kind prevents to import the method that reversal connection damages, and it is characterized in that described method comprises:
Obtain the current sense of current;
Judge whether the described current sense of current is the sense of current that makes the protected device operate as normal;
If the sense of current of described protected device operate as normal is then controlled the controlled switch conducting, make current electric current pass through protected device;
If not the sense of current of described protected device operate as normal, then control the not conducting of described controlled switch.
5. method according to claim 4 is characterized in that, when described controlled switch is relay, describedly judges whether the described current sense of current is the sense of current that makes the protected device operate as normal; If the sense of current of described protected device operate as normal is then controlled the controlled switch conducting, current electric current is specifically comprised by protected device:
Judge whether the described current sense of current is the sense of current that makes the protected device operate as normal, if the sense of current of described protected device operate as normal, then described relay is slow to be opened, and makes current electric current pass through protected device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010612461 CN102142681A (en) | 2010-12-23 | 2010-12-23 | Method and device for preventing input reverse-connection damage |
| PCT/CN2011/079819 WO2012083738A1 (en) | 2010-12-23 | 2011-09-19 | Method and device for preventing input reverse-connection damage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010612461 CN102142681A (en) | 2010-12-23 | 2010-12-23 | Method and device for preventing input reverse-connection damage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102142681A true CN102142681A (en) | 2011-08-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010612461 Pending CN102142681A (en) | 2010-12-23 | 2010-12-23 | Method and device for preventing input reverse-connection damage |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102142681A (en) |
| WO (1) | WO2012083738A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012083738A1 (en) * | 2010-12-23 | 2012-06-28 | 华为技术有限公司 | Method and device for preventing input reverse-connection damage |
| CN105245104A (en) * | 2015-10-30 | 2016-01-13 | 江阴万事兴技术有限公司 | Intelligent photovoltaic power adjustor and adjusting method |
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| US5410441A (en) * | 1993-02-01 | 1995-04-25 | Motorola, Inc. | Circuit for protecting DC powered devices from improper supply voltages |
| US5517379A (en) * | 1993-05-26 | 1996-05-14 | Siliconix Incorporated | Reverse battery protection device containing power MOSFET |
| US5519557A (en) * | 1993-11-19 | 1996-05-21 | Chrysler Corporation | Power supply polarity reversal protection circuit |
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| DE19733707A1 (en) * | 1997-08-04 | 1999-02-11 | Siemens Ag | Protection circuit e.g. for polarity reversal in motor vehicle low voltage applications |
| US6304422B1 (en) * | 1998-04-21 | 2001-10-16 | Infineon Technologies Ag | Polarity reversal protection circuit |
| CN1832285A (en) * | 2005-03-10 | 2006-09-13 | 通用汽车环球科技运作公司 | Nmos reverse battery protection |
| CN101174770A (en) * | 2007-11-21 | 2008-05-07 | 中兴通讯股份有限公司 | Charging protection method and device |
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| CN101872971A (en) * | 2010-07-02 | 2010-10-27 | 北京星网锐捷网络技术有限公司 | Reverse-connection preventing circuit, reverse-connection preventing processing method and communication equipment |
| CN201639290U (en) * | 2010-02-27 | 2010-11-17 | 比亚迪股份有限公司 | Device for preventing main loop of backup battery from being inversely connected |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201632290U (en) * | 2009-12-29 | 2010-11-17 | 三一重型装备有限公司 | Locking device of crusher hammer |
| CN102142681A (en) * | 2010-12-23 | 2011-08-03 | 聚信科技有限公司 | Method and device for preventing input reverse-connection damage |
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2010
- 2010-12-23 CN CN 201010612461 patent/CN102142681A/en active Pending
-
2011
- 2011-09-19 WO PCT/CN2011/079819 patent/WO2012083738A1/en active Application Filing
Patent Citations (13)
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| JPH02179223A (en) * | 1988-10-20 | 1990-07-12 | Daimler Benz Ag | Energizing device for induced load of automobile |
| US5410441A (en) * | 1993-02-01 | 1995-04-25 | Motorola, Inc. | Circuit for protecting DC powered devices from improper supply voltages |
| US5517379A (en) * | 1993-05-26 | 1996-05-14 | Siliconix Incorporated | Reverse battery protection device containing power MOSFET |
| US5519557A (en) * | 1993-11-19 | 1996-05-21 | Chrysler Corporation | Power supply polarity reversal protection circuit |
| US5519559A (en) * | 1994-07-11 | 1996-05-21 | Aerospatiale Societe Nationale Industrielle | Electronic connection device with reverse polarity protection |
| DE19733707A1 (en) * | 1997-08-04 | 1999-02-11 | Siemens Ag | Protection circuit e.g. for polarity reversal in motor vehicle low voltage applications |
| US6304422B1 (en) * | 1998-04-21 | 2001-10-16 | Infineon Technologies Ag | Polarity reversal protection circuit |
| CN1832285A (en) * | 2005-03-10 | 2006-09-13 | 通用汽车环球科技运作公司 | Nmos reverse battery protection |
| CN101174770A (en) * | 2007-11-21 | 2008-05-07 | 中兴通讯股份有限公司 | Charging protection method and device |
| CN201312124Y (en) * | 2008-12-09 | 2009-09-16 | 黄敬党 | Protection circuit for preventing accumulator charging and reversal connection |
| CN201639290U (en) * | 2010-02-27 | 2010-11-17 | 比亚迪股份有限公司 | Device for preventing main loop of backup battery from being inversely connected |
| CN201674224U (en) * | 2010-04-02 | 2010-12-15 | 石家庄国耀电子科技有限公司 | Reverse connection proof buffer protection device for direct current power supply input |
| CN101872971A (en) * | 2010-07-02 | 2010-10-27 | 北京星网锐捷网络技术有限公司 | Reverse-connection preventing circuit, reverse-connection preventing processing method and communication equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012083738A1 (en) * | 2010-12-23 | 2012-06-28 | 华为技术有限公司 | Method and device for preventing input reverse-connection damage |
| CN105245104A (en) * | 2015-10-30 | 2016-01-13 | 江阴万事兴技术有限公司 | Intelligent photovoltaic power adjustor and adjusting method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012083738A1 (en) | 2012-06-28 |
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Application publication date: 20110803 |