CN1464607A - Auto-power-off electrical source protecting equipment - Google Patents
Auto-power-off electrical source protecting equipment Download PDFInfo
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- CN1464607A CN1464607A CN 02124301 CN02124301A CN1464607A CN 1464607 A CN1464607 A CN 1464607A CN 02124301 CN02124301 CN 02124301 CN 02124301 A CN02124301 A CN 02124301A CN 1464607 A CN1464607 A CN 1464607A
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Abstract
The invention discloses an automatic lock power-off protecting equipment that can be disposed in electronic devices. The electronic device includes a power supplying device and a primary functional circuit, the power supplying device is coupled to the primary functional circuit through an electronic switch, to make the primary functional circuit access the power needed for the operation through the power end of the electronic switch. The automatic lock protecting equipment includes a low-voltage starting cut-off device and a low-voltage reactor, wherein the low-voltage starting cut-off device is coupled to the electronic switch for controlling the conducting or cut-off of the electronic switch, and the low-voltage reactor is coupled to the power supply end and the low-voltage starting cut-off device. When short-circuit occurs on the power supply end, the low-voltage reactor will make the low-voltage starting cut-off device to shut the electronic switch, to cut off the power supply of the primary functional circuit.
Description
(1) technical field
The relevant a kind of circuit protection device of the present invention, particularly relevant a kind of overcurrent protective device.
(2) background technology
Scientific and technological industry is flourish in recent years, and all kinds of electronic devices is accurate complicated, so the stable power supply is also more and more paid attention to.Power supply with notebook is arranged to example, it is except the rechargeable battery of inside, and other disposes the power supply unit of circumscribed, can allow the notebook be power supply with the civil power, and when using, synchronously rechargeable battery is charged the electric power during with the motor-driven use of deposit notebook.
Please refer to Fig. 1, the supply power mode of traditional electronic devices shown in the figure.With the notebook is example, and power supply unit 11 promptly is the circumscribed power supply unit (non-finger rechargeable battery) of notebook, and primary function circuit 12 then is in order to realize the circuit general name of notebook function.Power supply unit 11 couples by electronic switch and primary function circuit 12, to provide primary function circuit 12 runnings required power supply; Wherein electronic switch can utilize transistor to realize, this transistor can be two junction transistors (BJT) or mos field effect transistor (MOSFET), N type metal oxide semiconductor field-effect transistor (hereinafter to be referred as NMOS Q) or P-type mos field-effect transistor (being called for short PMOS, not shown) as icon all can.With regard to NMOS Q, its source electrode (source) can be used as power end Vin, when power supply unit 11 connects notebook, the gate of NMOS Q (gate) just can be coupled to a high potential VH who comes from power supply unit 11 by resistance R and make NMOS Q conducting, and primary function circuit 12 just can obtain the power supply supply by power end Vin like this; Certainly, this power supply is to come from power supply unit 11.
When the short circuit phenomenon of computer-internal generation unknown cause, according to general power supply unit design, power supply unit 11 can be replied action because of external short circuit makes its out-put supply carry out automatic switch.Even so, the effective value of short circuit current is still not little, so computer-internal tends to cause part damage even monoblock machine plate to be committed to the flames because short circuit current is excessive or short circuit produces high temperature too for a long time.
Although the research staff has recognized the seriousness of this problem; but suffer from computer-internal when being short-circuited phenomenon; all power supplys all can be pulled to the utmost point low-voltage of practically negligible volt, at this moment will not have any power available in the system and start circuit overcurrent protection (over current protection circuit).For now, the short circuit current that notebook is produced when being short-circuited fault has 2～4 amperes at least, especially for cooperating its power of the employed power supply unit of present P4 CPU can reach more than the 80W, thus its short-circuit current value also up to 5 amperes about, quite surprising to the destructive power of system.
The general method that solves short trouble is nothing more than two kinds, the effective value electric current that the first is produced when reducing power supply unit because of external short circuit, and it two is to increase power and the current value that electronic switch can bear.About first point, along with the CPU speed that notebook adopted is more and more faster, the power that computer system consumes is also big more, so the power of power supply unit also will promote just foot and apply and use, and is not easy to realize so reduce the target of short circuit current.About second point, exempt from the high temperature damage though adopt anti-big electric current and high-power electronic switch can temporarily save it from damage, but because short trouble is not got rid of, so short circuit current still continues to exist, of long duration still can cause part or machine plate to burn, the time that this measure just damages parts at most prolongs some backward, and can't avoid the generation of disaster.In addition, big electric current of ability and high-power electronic switch are with high costs, also can therefore reduce competitiveness of product.
(3) summary of the invention
In view of this, the purpose of this invention is to provide a kind of auto-power-off (auto latch-off) apparatus for protecting power supply, the supply of can in time cutting off the electricity supply when system is short-circuited fault suffers damage to avoid parts with the short circuit current of preventing.
For achieving the above object; auto-power-off electrical source protecting equipment of the present invention; it is configurable in an electronic installation; this electronic installation comprises power supply unit and primary function circuit; power supply unit couples by electronic switch and primary function circuit, makes primary function circuit obtain the required power supply of running by the power end of electronic switch.Auto-power-off electrical source protecting equipment comprises that low voltage starting ends device and low-pressure reactor, and low voltage starting is coupled to electronic switch by device, in order to control the electronic switch conducting or to end.Low-pressure reactor then couples by device with power end and low voltage starting, and when the power end short circuit, low-pressure reactor can make low voltage starting end device and close electronic switch, to cut off the power supply supply of primary function circuit.
Low-pressure reactor can comprise biasing device and transistor switch, and low voltage starting can comprise by device and electrical storage device by device, wherein opens (open) or closes (close) by device may command electronic switch.After the current potential dividing potential drop of biasing device with power end, can make its conducting, allow transistor switch close, be in conducting state to keep electronic switch by device in order to the bias transistor switch.On the other hand, electrical storage device can operate just often redundant electrical power in advance in primary function circuit, when being short-circuited fault, transistor switch can't be obtained enough bias voltages and be closed, the power initiation that can utilize this moment electrical storage device to lay in ends device, makes by device electronic switch cuts out with the short circuit current of preventing.
In actual applications, also can utilize transistor switch to be achieved by device.Electrical storage device can be the RC circuit, in order to electric capacity deposit required power supply when device starts.
For further specifying purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 is the circuit diagram that shows the supply power mode of traditional electronic devices.
Fig. 2 is the auto-power-off electrical source protecting equipment allocation plan according to a preferred embodiment of the present invention.
Fig. 3 is that displayed map 2 mesolows start by device and the circuit framework of low-pressure reactor and the circuit structure diagram of configuration scenario.
(5) embodiment
The most flat-footed way of short circuit current of desiring to prevent is to cut off the power supply supply of primary function circuit 12, allows short circuit current have no way of producing.Therefore, as long as the bridge-electronic switch (for example NMOS Q of Fig. 1) of 12 of power supply unit 11 and primary function circuit can be cut off the short circuit current of just can preventing during short circuit.Please refer to Fig. 2, it is the auto-power-off electrical source protecting equipment allocation plan according to a preferred embodiment of the present invention.Auto-power-off electrical source protecting equipment comprises that low voltage starting ends device 22 and low-pressure reactor 27, and low voltage starting is coupled to NMOS Q as electronic switch by device 22, in order to control NMOS Q conducting or end; 27 of low-pressure reactors end device 22 with power end Vin and low voltage starting and couple.During power end Vin short circuit, low-pressure reactor 27 can start low voltage starting by device 22, makes low voltage starting end device 22 and closes (turn off) NMOS Q.After NMOS Q closed, 12 of power supply unit 11 and primary function circuit promptly were (close) state that opens circuit, and primary function circuit 12 has been lost the power supply supply, and natural short circuit current is prevented immediately, had safeguarded that parts avoid suffering high temperature and damage.
Then please refer to Fig. 3, show circuit framework and the configuration scenario of low voltage starting among the figure by device 22 and low-pressure reactor 27.Primary function circuit 12 is not short-circuited before the fault, if power supply unit 11 is connected notebook, the gate of NMOS Q can be coupled to high potential VH by resistance R and make NMOS Q conducting, allows primary function circuit 12 obtain required power supply supply from power end Vin.On the other hand, after the current potential dividing potential drop of biasing device 275 with power end Vin, can make its conducting in order to bias transistor switch Q1, this moment, the collection electrode potential of transistor switch Q1 was about 0.2 volt utmost point low-voltage (this is the collection utmost point-emitter voltage VCE (saturation) of transistor switch Q1 when saturated, yet this magnitude of voltage should be decided on the specification of transistor switch Q1).In practical application, the engineering staff can go out suitable biasing device 275 according to the practice Demand Design, for example can be composed in series by Zener diode (Zener diode) Dz and resistance R 1.
Low voltage starting can comprise for example being the transistor switch Q2 that is coupled to NMOS Q by device 221 and electrical storage device 223 by device 221 by device 22, is used for closing when primary function circuit 12 short circuits NMOS Q.Above mention, traditionally during primary function circuit 12 short circuits because power end is pulled to extremely low current potential, will not have available power initiation protective circuit when being.For addressing this problem, electrical storage device 223 provided by the present invention can operate just often redundant electrical power in advance in primary function circuit 12, can utilize this power initiation by device 221 when being short-circuited fault, makes by device 221 NMOS Q is closed.
When short trouble took place, power end Vin can be pulled to Very Low Potential, causes transistor switch Q2 to be closed because of obtaining enough bias voltages.On the other hand, though high potential VH also can disappear when power end Vin was short-circuited thereupon, but because the resistance value of resistance R 3 is much larger than resistance R 2, therefore the current potential of being accumulated on the capacitor C is very slow through the speed of resistance R 3 discharges, the current potential of capacitor C will be enough to impel transistor switch Q2 conducting this moment, and electronic switch Q is closed because of gate ground connection.
Electronic switch Q closes between back power supply unit 11 and the primary function circuit 12 and is off state, so high potential VH is subjected to power supply unit 11 power supplies immediately and recovers primary voltage position standard, and then continue capacitor C is charged, form bolt-lock and live the conducting state of transistor switch Q2, therefore electronic switch Q also continues to close.
Briefly, inoperative under the state of normal power supply in order to allow low voltage starting end device 22, so need to add low-pressure reactor 27.Power end Vin has voltage when normal power supply, this will make transistor switch Q1 conducting to close transistor switch Q2, allows electronic switch Q continue conducting.When power end Vin is short-circuited or will causes transistor switch Q1 to close during brownout, the power supply that this moment, electrical storage device 223 was accumulated will make transistor switch Q2 conducting to close electronic switch Q.Electronic switch Q closes back high potential VH and soon recovers, and makes electrical storage device 223 continue to be recharged and bolt-lock is lived the conducting state of transistor switch Q2, allows electronic switch Q continue to close, with the short circuit current of preventing.
Though it should be noted that the transistor switch in this preferred embodiment is example and explanation with two junction transistors, the transistor of other kind-also can be used as transistor switch as field-effect transistor (FET) or MOSFET etc. to use.
Auto-power-off electrical source protecting equipment of the present invention has the following advantages at least:
One, can cut off the electricity supply at once when short trouble takes place online between supply and primary function circuit is with the short circuit current of preventing.
Two, must not change the specification of power supply unit and the withstand voltage design of electronic switch.
Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (20)
1. auto-power-off electrical source protecting equipment; in order to be disposed in the electronic installation; this electronic installation comprises a power supply unit and one and the electronic switch that couples of this power supply unit; wherein this electronic switch has a power end; this electronic installation is to obtain power supply from this power end; it is characterized in that this auto-power-off electrical source protecting equipment comprises:
One low voltage starting is by device, and it is coupled to this electronic switch, closes this electronic switch when being used for this power end short circuit; And
One low-pressure reactor, it is coupled to this power end and this low voltage starting ends device, and during this power end short circuit, this low-pressure reactor can make this low voltage starting close this electronic switch by device.
2. auto-power-off electrical source protecting equipment as claimed in claim 1 is characterized in that, this electronic switch is a transistor.
3. auto-power-off electrical source protecting equipment as claimed in claim 2 is characterized in that, this transistor is a mos field effect transistor (MOSFET).
4. auto-power-off electrical source protecting equipment as claimed in claim 3 is characterized in that, this mos field effect transistor is the N type.
5. auto-power-off electrical source protecting equipment as claimed in claim 3 is characterized in that, this mos field effect transistor is the P type.
6. auto-power-off electrical source protecting equipment as claimed in claim 1 is characterized in that, this low-pressure reactor comprises:
One transistor switch is coupled to this low voltage starting by device; And
One biasing device is coupled to this transistor switch and this power end, in order to this transistor switch of bias voltage.
7. auto-power-off electrical source protecting equipment as claimed in claim 6 is characterized in that, this biasing device is to be in series by a Zener diode and a resistance.
8. auto-power-off electrical source protecting equipment as claimed in claim 6 is characterized in that, this transistor switch is two junction transistors.
9. auto-power-off electrical source protecting equipment; in order to be disposed in the electronic installation; this electronic installation comprises a power supply unit and one and the electronic switch that couples of this power supply unit; wherein; this electronic switch has a power end; this electronic installation is to obtain power supply from this power end, it is characterized in that, this auto-power-off electrical source protecting equipment comprises:
One by device, and it is coupled to this electronic switch, in order to close this electronic switch;
One electrical storage device, it is coupled to this by device and this power supply unit, and accumulates a startup power supply by this power supply unit, should be by device in order to start; And
One low-pressure reactor is coupled to this power end and this electrical storage device, and when this power end short circuit, this low-pressure reactor can make this startup power supply feed-in should end device to close this electronic switch.
10. auto-power-off electrical source protecting equipment as claimed in claim 9 is characterized in that, should be a transistor switch by device.
11. auto-power-off electrical source protecting equipment as claimed in claim 10 is characterized in that, this transistor switch is two junction transistors.
12. auto-power-off electrical source protecting equipment as claimed in claim 9 is characterized in that, this electrical storage device is a RC circuit.
13. auto-power-off electrical source protecting equipment as claimed in claim 9 is characterized in that, this electronic switch is a transistor.
14. auto-power-off electrical source protecting equipment as claimed in claim 13 is characterized in that, this transistor is a mos field effect transistor.
15. auto-power-off electrical source protecting equipment as claimed in claim 14 is characterized in that, this mos field effect transistor is the N type.
16. auto-power-off electrical source protecting equipment as claimed in claim 14 is characterized in that, this mos field effect transistor is the P type.
17. auto-power-off electrical source protecting equipment as claimed in claim 9 is characterized in that, this low-pressure reactor comprises:
One transistor switch, it is coupled to this low voltage starting by device; And
One biasing device, it is coupled to this transistor switch and this power end, in order to this transistor switch of bias voltage.
18. auto-power-off electrical source protecting equipment as claimed in claim 17 is characterized in that, this biasing device is to be in series by a Zener diode and a resistance.
19. auto-power-off electrical source protecting equipment as claimed in claim 17 is characterized in that, this transistor switch is two junction transistors.
20. auto-power-off electrical source protecting equipment as claimed in claim 9 is characterized in that, this electronic installation is a notebook.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021243018A CN100349346C (en) | 2002-06-10 | 2002-06-10 | Auto-power-off electrical source protecting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021243018A CN100349346C (en) | 2002-06-10 | 2002-06-10 | Auto-power-off electrical source protecting equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1464607A true CN1464607A (en) | 2003-12-31 |
| CN100349346C CN100349346C (en) | 2007-11-14 |
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ID=29743792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021243018A Expired - Fee Related CN100349346C (en) | 2002-06-10 | 2002-06-10 | Auto-power-off electrical source protecting equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100349346C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986492A (en) * | 2010-11-08 | 2011-03-16 | 中兴通讯股份有限公司 | Short-circuit protection circuit and short-circuit protection method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3505986A1 (en) * | 1985-02-21 | 1986-08-21 | Deutsche Thomson-Brandt Gmbh, 7730 Villingen-Schwenningen | SHORT-CIRCUIT-RESISTANT POWER SUPPLY, IN PARTICULAR FOR A TELEVISION RECEIVER |
| US4771357A (en) * | 1986-07-23 | 1988-09-13 | Motorola, Inc. | Power driver having short circuit protection |
| JP3561064B2 (en) * | 1995-12-21 | 2004-09-02 | 富士通株式会社 | Switching regulator |
| JPH10322882A (en) * | 1997-05-20 | 1998-12-04 | Matsushita Electric Ind Co Ltd | Electronic switch load short circuit protection device |
| CN2333112Y (en) * | 1998-03-27 | 1999-08-11 | 智翎股份有限公司 | Overcurrent protector of power supplying unit |
-
2002
- 2002-06-10 CN CNB021243018A patent/CN100349346C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986492A (en) * | 2010-11-08 | 2011-03-16 | 中兴通讯股份有限公司 | Short-circuit protection circuit and short-circuit protection method |
| CN101986492B (en) * | 2010-11-08 | 2015-01-28 | 中兴通讯股份有限公司 | Short-circuit protection circuit and short-circuit protection method |
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| Publication number | Publication date |
|---|---|
| CN100349346C (en) | 2007-11-14 |
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