CN1614851A - Protecting circuit and peripheral apparatus with protecting circuit and application - Google Patents
Protecting circuit and peripheral apparatus with protecting circuit and application Download PDFInfo
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- CN1614851A CN1614851A CN 200310118159 CN200310118159A CN1614851A CN 1614851 A CN1614851 A CN 1614851A CN 200310118159 CN200310118159 CN 200310118159 CN 200310118159 A CN200310118159 A CN 200310118159A CN 1614851 A CN1614851 A CN 1614851A
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Abstract
The peripheral unit consists of an electric energy storing unit. The protective circuit consists of first and second charging path, a voltage detector. When the voltage value of electric energy storing unit is lower than a threshold voltage the voltage detector switches into first charging path to charge the electric energy storing unit through first charging path by using power through first charging path. The first charging path has the function of limiting the amount of the current. When the voltage value of electric energy storing unit is not lower than the threshold voltage the voltage detector switches into second charging path to charge the electric energy storing unit by using second charging path through the second charging path.
Description
Technical field
The present invention is relevant for a kind of protective circuit, and particularly the electric current that offers a peripheral unit relevant for a kind of power supply that makes an electronic installation is limited to the protective circuit in the preset range.
Background technology
A common electronic installation powers up or can produce very great start-up current and voltage fluctuation during hot plug one peripheral element at circuit, and these phenomenons will influence the operate as normal of equipment, even cause the infringement of whole system.Tradition adopts the protective circuit of resolution element to have shortcomings such as reliability is low, maintenance cost height; in order to satisfy the requirement of special applications; many system configuration protective circuit such as ESO protection and Antisurge current, overcurrent, under-voltage, overvoltage and electric current inhibition; some protective circuit is relevant with special industry or industry standard; some then meets certain criteria, as: UL, USB, IEEE, CSA or IEC.Protective circuit is mainly used in protection equipment or operating personnel, and some power supply inside have adjustable current-limiting function, is powering up or damage equipment during the hot plug peripheral element avoiding.The minimum requirements of current suppressing circuit provides inrush current limitation, prevents that when big capacitive load powers up whole system damages, and current-limiting function also helps to reduce the size of power supply, and prevents generation electric arc when connector contact.
The employed peripheral unit of general communication, as: global mobile system (global system formobile, GSM) card or general packet radio service (general packet radio service, GPRS) card, the usefulness of wireless transmission is provided because of the bigger power of needs, the capital adds many big electric capacity supply power amplifier (power amplifier, PA) use, and such peripheral unit is if insert the system of being carried, as: personal digital assistant (per sonal digital assistant), notebook computer (notebook) or personal computer (personal computer), moment, these big electric capacity can cause big electric current to be installed to the periphery by system flow, and caused system's instability or deadlock phenomenon.
Therefore for avoiding above-mentioned shortcoming to take place in these similar applicable cases; reaction is fast, volume is little and low-cost protective circuit solves such puzzlement so the invention provides one, and prevents from simultaneously to take place because of peripheral unit can cause the danger of big electric current under the situation of short circuit.
Summary of the invention
In view of this; the invention provides a kind of protective circuit; the electric current that makes the power supply of an electronic installation offer a peripheral unit is limited in the preset range; when preventing that peripheral unit is connected with electronic installation; moment, the power storaging unit of peripheral unit can cause big electric current, and prevented from simultaneously to damage electronic installation because of peripheral unit causes big electric current under the situation of short circuit.
For achieving the above object; the present invention propose a kind of make power supply that an electronic installation provided to the electric current of a peripheral unit in a preset range; its peripheral unit has a power storaging unit, and protective circuit comprises one first and second charge path and a voltage detector.
First and second charge paths are to be arranged between power storaging unit and the power supply, in order to the path of power supply to the different chargings of power storaging unit to be provided, wherein; First charge path has more the function of current limit size.Voltage detector is the magnitude of voltage in order to the detection power storaging unit, and optionally switches first and second charge paths, and power supply is charged to power storaging unit.
When the magnitude of voltage of power storaging unit was lower than a threshold voltage, voltage detector switched first charge path, makes power supply pass through first charge path power storaging unit is charged; When the magnitude of voltage of power storaging unit was not less than this threshold voltage, voltage detector then switched second charge path, makes power supply pass through second charge path power storaging unit is charged.
Prevent that whereby peripheral unit and electronic installation are when being connected, because of contact produces electric arc, cause power storaging unit moment to cause big electric current to flow to peripheral unit by electronic installation, and prevent that simultaneously peripheral unit from can cause the danger of big electric current to take place under the situation of short circuit, and cause the unstable or deadlock of electronic installation.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, some preferred embodiments cited below particularly, and conjunction with figs. are described in detail as follows.
Fig. 1 represents first embodiment of the invention protective circuit and peripheral calcspar.
Fig. 2 represents second embodiment of the invention protective circuit and peripheral circuit diagram.
Fig. 3 represents that third embodiment of the invention has the calcspar of the peripheral unit of protective circuit.
Fig. 4 represents that fourth embodiment of the invention has the calcspar of the electronic installation of protective circuit.
Symbol description
10～electronic installation, 102～power supply, 20～protective circuit; 202～the first charge paths, 204～the second charge paths, 206～voltage detector; 208～the first switches; 210～current-limiting apparatus, 212～second switch, 214～biasing resistor; 30～power storaging unit; 40～peripheral unit, the magnitude of voltage of VDD～power storaging unit, V
OutThe output voltage of～voltage detector.
Embodiment
Embodiment one
Fig. 1 represents first embodiment of the present invention protective circuit and peripheral calcspar.As shown in Figure 1, an electronic installation 10 has a power supply 102, and a peripheral unit 40 has a power storaging unit 30, and a protective circuit 20 is coupled between electronic installation 10 and the peripheral unit 40.Protective circuit 20 comprises that one first charge path 202 is coupled between power supply 102 and the power storaging unit 30, one second charge path 204 is coupled between power supply 102 and the power storaging unit 30 and a voltage detector 206 couples power storaging unit 30, first charge path 202, first charge path 204 and be coupled to power supply 102 via a biasing resistor 214; wherein: first charge path 202 comprises one first switch 208 and a current-limiting apparatus 210, and second charge path 204 comprises a second switch 212.
The operation principle of protective circuit of the present invention is as follows.First charge path 202 and second charge path 204 are arranged at respectively between power supply 102 and the power storaging unit 30, and voltage detector 206 is in order to detect the magnitude of voltage VDD of power storaging unit 30, and the magnitude of voltage VDD of power storaging unit 30 and a threshold voltage (indicating) made comparisons, when the magnitude of voltage VDD of power storaging unit 30 is lower than threshold voltage, voltage detector 206 promptly switches first charge path 202 makes 208 conductings of first switch, power supply 102 charges to power storaging unit 30 via first switch 208, wherein; Current-limiting apparatus 210 makes the electric current that flows in first charge path 202 less than preset range.When the magnitude of voltage VDD of power storaging unit 30 was not less than threshold voltage, voltage detector 206 promptly switches second charge path 204 made second switch 212 conductings, and power supply 102 charges to power storaging unit 30 via second charge path 204.
Using global mobile system (globalsystem for mobile as personal digital assistant (personal digital assistant), notebook computer (notebook) or personal computer (personal computer), GSM) card or general packet radio service (general packet radioservice, when GPRS) blocking, may cause producing electric arc during insertion system, make the electric capacity moment in the card cause big electric current to hold to card by system flow when card; So detect the magnitude of voltage of energy-storage travelling wave tube by the present invention, and selectivity is switched different charge paths according to the magnitude of voltage size, with protection and systems stabilisation, in addition; Can prevent that more peripheral unit from can cause big electric current under the situation of short circuit, and cause the unstable or deadlock of system.
Embodiment two
Fig. 2 represents second embodiment of the present invention protective circuit and peripheral circuit diagram.The operation principle of present embodiment is with shown in above-mentioned first embodiment, in addition; Difference be in use an analog switch as first switch 208, a current-limiting resistance as current-limiting apparatus 210, a P-type mos transistor (PMOS) as second switch 212 and a capacitor as power storaging unit 30.
Wherein, when the magnitude of voltage VDD of power storaging unit 30 is lower than threshold voltage, the output voltage V of voltage detector 206
OutBe high level, at this moment; Analog switch first switch 208 is subjected to the output voltage V of voltage detector 206
OutControl and conducting, and electric current can be charged to capacitor electric energy storage element 30 through current-limiting resistance current-limiting apparatus 210 by analog switch first switch 208, and current limited leakage resistance current-limiting apparatus 210 suppresses.
When the magnitude of voltage VDD of power storaging unit 30 is not less than threshold voltage, the output voltage V of voltage detector 206
OutBe low level, at this moment; P-type mos transistor second switch 212 is subjected to the output voltage V of voltage detector 206
OutControl and conducting, and electric current can be via P-type mos transistor second switch 212 to 30 chargings of capacitor electric energy storage element.
Embodiment three
Fig. 3 represents that the third embodiment of the present invention has the calcspar of the peripheral unit of protective circuit.The operation principle of present embodiment is with shown in above-mentioned first embodiment, in addition; Difference is in protective circuit 20 is arranged in the peripheral unit 40.
Embodiment four
Fig. 4 represents that the fourth embodiment of the present invention has the calcspar of the electronic installation of protective circuit.The operation principle of present embodiment is with shown in above-mentioned first embodiment, in addition; Difference is in protective circuit 20 is arranged in the electronic installation 10.
Though the present invention with two preferred embodiments openly as above, right its is not in order to limit the present invention, any those skilled in the art, under the situation that does not break away from the spirit and scope of the present invention, can change and modification, therefore scope of the present invention is as the criterion with the claim restricted portion that is proposed.
Claims (21)
1. protective circuit, the electric current that is used to make a power supply of an electronic installation to offer a peripheral unit is limited in the preset range, and this peripheral unit has a power storaging unit, and this protective circuit comprises:
One first charge path is arranged between this power supply and the power storaging unit, and this path has the function of current limit size;
One second charge path is arranged between this power supply and the power storaging unit;
One voltage detector detects the magnitude of voltage of this power storaging unit, optionally switches this first path and this second path and makes this power supply to this power storaging unit charging;
Wherein, when the magnitude of voltage of this power storaging unit was lower than a threshold voltage, this voltage detector switched this first charge path, and this power supply is charged to this power storaging unit by this first charge path;
When the magnitude of voltage of this power storaging unit is not less than this threshold voltage, this voltage detector will switch this second charge path, and this power supply is charged to this power storaging unit by this second charge path.
2. protective circuit as claimed in claim 1, wherein this first path comprises:
One first switch;
One current-limiting apparatus;
When this voltage detector switches this first charge path, this first switch conduction, this first current-limiting apparatus make the electric current that flows in this first charge path less than this preset range, and when this voltage detector switches this second charge path, this first switch opens circuit.
3. protective circuit as claimed in claim 2, this current-limiting apparatus are a resistance.
4. protective circuit as claimed in claim 1, wherein this second charge path comprises:
One second switch, when this voltage detector switches this first charge path, this second switch opens circuit, when this voltage detector switches this first charge path, this first switch conduction.
5. protective circuit as claimed in claim 2, wherein, this first switch is to be an analog switch.
6. protective circuit as claimed in claim 4, wherein, this second switch is to be a metal oxide semiconductor transistor (MOSFET).
7. protective circuit as claimed in claim 6, wherein, this metal oxide semiconductor transistor is to be a P-type mos transistor (PMOS).
8. the peripheral unit with protective circuit is coupled to the power supply in the electronic installation, is used to make the electric current that this power supply flows out to be limited in the preset range, and this peripheral unit comprises:
One power storaging unit;
One protective circuit comprises:
One first charge path is arranged between this power supply and the power storaging unit, and this path has the function of current limit size;
One second charge path is arranged between this power supply and the power storaging unit;
One voltage detector detects the magnitude of voltage of this power storaging unit, optionally switches this first charge path and this second charge path and makes this power supply to this power storaging unit charging;
Wherein, when the magnitude of voltage of this power storaging unit was lower than a threshold voltage, this voltage detector switched this first charge path, and this power supply is charged to this power storaging unit by this first charge path;
When the magnitude of voltage of this power storaging unit is not less than this threshold voltage, this voltage detector will switch this second charge path, and this power supply is charged to this power storaging unit by this second charge path.
9. the peripheral unit with protective circuit as claimed in claim 8, wherein this first charge path also comprises:
One first switch;
One current-limiting apparatus;
When this voltage detector switches this first charge path, this first switch conduction, this first current-limiting apparatus make the electric current that flows in this first charge path less than this preset range, and when this voltage detector switches this second charge path, this first switch opens circuit.
10. the peripheral unit with protective circuit as claimed in claim 9, this current-limiting apparatus are a resistance.
11. the peripheral unit with protective circuit as claimed in claim 8, wherein this second charge path comprises:
One second switch, when this voltage detector switches this first charge path, this second switch opens circuit, when this voltage detector switches this first charge path, this first switch conduction.
12. the peripheral unit with protective circuit as claimed in claim 9, wherein, this first switch is to be an analog switch.
13. the peripheral unit with protective circuit as claimed in claim 11, wherein, this second switch is to be a metal oxide semiconductor transistor (MOSFET).
14. the peripheral unit with protective circuit as claimed in claim 13, wherein, this metal oxide semiconductor transistor is to be a P-type mos transistor (PMOS).
15. the electronic installation with protective circuit couples a peripheral unit, is used to make the electric current that flow to peripheral unit to be limited in the preset range, this peripheral unit has a power storaging unit, and this electronic installation comprises:
One power supply;
One protective circuit comprises:
One first charge path is arranged between this power supply and the power storaging unit, and this path has the function of current limit size;
One second charge path is arranged between this power supply and the power storaging unit;
One voltage detector detects the magnitude of voltage of this power storaging unit, optionally switches this first charge path and this second charge path and makes this power supply to this power storaging unit charging;
Wherein, when the magnitude of voltage of this power storaging unit was lower than a threshold voltage, this voltage detector switched this first charge path, and this power supply is charged to this power storaging unit by this first charge path;
When the magnitude of voltage of this power storaging unit is not less than this threshold voltage, this voltage detector will switch this second charge path, and this power supply is charged to this power storaging unit by this second charge path.
16. the electronic installation with protective circuit as claimed in claim 15, wherein this first charge path also comprises:
One first switch;
One current-limiting apparatus;
When this voltage detector switches this first path, this first switch conduction, this first current-limiting apparatus make the electric current that flows in this first charge path less than this preset range, and when this voltage detector switches this second charge path, this first switch opens circuit.
17. the electronic installation with protective circuit as claimed in claim 16, this current-limiting apparatus are a resistance.
18. the electronic installation with protective circuit as claimed in claim 15, wherein this second charge path comprises:
One second switch, when this voltage detector switches this first charge path, this second switch opens circuit, when this voltage detector switches this first charge path, this first switch conduction.
19. the electronic installation with protective circuit as claimed in claim 16, wherein, this first switch is to be an analog switch.
20. the electronic installation with protective circuit as claimed in claim 18, wherein, this second switch is to be a metal oxide semiconductor transistor (MOSFET).
21. the electronic installation with protective circuit as claimed in claim 20, wherein, this metal oxide semiconductor transistor is to be a P-type mos transistor (PMOS).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310118159 CN1614851A (en) | 2003-11-06 | 2003-11-06 | Protecting circuit and peripheral apparatus with protecting circuit and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310118159 CN1614851A (en) | 2003-11-06 | 2003-11-06 | Protecting circuit and peripheral apparatus with protecting circuit and application |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1614851A true CN1614851A (en) | 2005-05-11 |
Family
ID=34761079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310118159 Pending CN1614851A (en) | 2003-11-06 | 2003-11-06 | Protecting circuit and peripheral apparatus with protecting circuit and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1614851A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354689B (en) * | 2007-07-24 | 2010-09-01 | 明基电通股份有限公司 | System and method for transmitting signal |
| CN101969192A (en) * | 2010-09-09 | 2011-02-09 | 惠州Tcl移动通信有限公司 | Communication terminal for protecting universal serial bus (USB) power supply equipment |
| CN101626299B (en) * | 2009-08-04 | 2012-03-07 | 北京星网锐捷网络技术有限公司 | Stackable switch, switch stacking system and cable hot plugging method |
| CN104333094A (en) * | 2014-11-21 | 2015-02-04 | 惠州Tcl移动通信有限公司 | Charging current control method and system based on mobile terminal |
| CN104345857A (en) * | 2013-08-01 | 2015-02-11 | 鸿富锦精密电子(天津)有限公司 | Short-circuit protection circuit |
| CN105308821A (en) * | 2013-06-04 | 2016-02-03 | 三星电子株式会社 | Electronic device and method for applying power depending on whether accessory is charged |
| CN105846409A (en) * | 2015-01-29 | 2016-08-10 | 美国莱迪思半导体公司 | Hotswap operations for programmable logic devices |
| CN104054234B (en) * | 2012-01-27 | 2017-07-04 | 索尼公司 | Electronic equipment and feed system |
-
2003
- 2003-11-06 CN CN 200310118159 patent/CN1614851A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354689B (en) * | 2007-07-24 | 2010-09-01 | 明基电通股份有限公司 | System and method for transmitting signal |
| CN101626299B (en) * | 2009-08-04 | 2012-03-07 | 北京星网锐捷网络技术有限公司 | Stackable switch, switch stacking system and cable hot plugging method |
| CN101969192A (en) * | 2010-09-09 | 2011-02-09 | 惠州Tcl移动通信有限公司 | Communication terminal for protecting universal serial bus (USB) power supply equipment |
| CN104054234B (en) * | 2012-01-27 | 2017-07-04 | 索尼公司 | Electronic equipment and feed system |
| CN105308821A (en) * | 2013-06-04 | 2016-02-03 | 三星电子株式会社 | Electronic device and method for applying power depending on whether accessory is charged |
| US10003201B2 (en) | 2013-06-04 | 2018-06-19 | Samsung Electronics Co., Ltd. | Electronic device and method for applying power depending on whether accessory is charged |
| CN105308821B (en) * | 2013-06-04 | 2018-04-10 | 三星电子株式会社 | For applying the electronic equipment of electric power and method according to whether annex is electrically charged |
| CN104345857B (en) * | 2013-08-01 | 2018-03-06 | 鸿富锦精密电子(天津)有限公司 | Short-circuit protection circuit |
| CN104345857A (en) * | 2013-08-01 | 2015-02-11 | 鸿富锦精密电子(天津)有限公司 | Short-circuit protection circuit |
| CN104333094A (en) * | 2014-11-21 | 2015-02-04 | 惠州Tcl移动通信有限公司 | Charging current control method and system based on mobile terminal |
| CN104333094B (en) * | 2014-11-21 | 2017-03-15 | 捷开通讯(深圳)有限公司 | A kind of charging current control method and system based on mobile terminal |
| CN105846409A (en) * | 2015-01-29 | 2016-08-10 | 美国莱迪思半导体公司 | Hotswap operations for programmable logic devices |
| CN105846409B (en) * | 2015-01-29 | 2019-06-14 | 美国莱迪思半导体公司 | Hot plug operations for programmable logic device |
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