CN2907021Y - Over-voltage protection circuit - Google Patents
Over-voltage protection circuit Download PDFInfo
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- CN2907021Y CN2907021Y CN 200620056481 CN200620056481U CN2907021Y CN 2907021 Y CN2907021 Y CN 2907021Y CN 200620056481 CN200620056481 CN 200620056481 CN 200620056481 U CN200620056481 U CN 200620056481U CN 2907021 Y CN2907021 Y CN 2907021Y
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Abstract
The utility model discloses a voltage protective circuit, which comprises a power switching module, a detecting module, a protective module and a power supply device. Wherein, the power switching module comprises an input end and an output end; the input end is connected with the power supply device, while the output end is connected with the load end and the detecting module end. The other end of the detecting module is connected with the end of the protective module; the other end of the protective module is connected with the power supply device. The detecting module is activated when the output voltage of the power switching module excesses the maximum voltage, and an over voltage signal is output to the protective module, the output current protection circuit in the power supply device is triggered by the protective module, enabling the power supply device to cut off the voltage output to realize the over voltage protection. The circuit of the utility model is simple in structure with a fast over voltage protection as well as a good use value.
Description
Technical field
The utility model is a kind of protective circuit, is in particular a kind of excess voltage protection of protecting at overvoltage.
Background technology
Along with the continuous progress of science and technology, computer technology also obtains constantly perfect thereupon.
In the prior art; the general server system is at the OVP of CPU and Memory (Over VoltageProtection; be called for short: when overvoltage protection) designing; what adopt usually all is to utilize CROW BAR (SCR or MOSFET) circuit, promptly adopts a protection module that output voltage or the direct ground connection of input voltage are protected.
Be illustrated in figure 1 as existing a kind of excess voltage protection.Power supply unit 100 connects a power transfer module 101, and the output 106 of this power transfer module 101 is connected with detection module 102; This overvoltage crowbar is to carry out overvoltage protection in the output of power transfer module 101, and promptly the output 106 in power transfer module 101 also connects a protection module 103, and this protection module 103 also also is connected with detection module 102.When the detection module 102 that links to each other with power transfer module 101 detects power transfer module 101 output voltages above load 104 maximum stop voltages; just go to trigger protection module 103 actions that are attached thereto; protection module 103 just can be with the output voltage ground connection of power transfer module 101, and reach the function of overvoltage protection.
As shown in Figure 2, another existing excess voltage protection.With respect to overvoltage crowbar shown in Figure 1; it connects a fuse 107 between power supply unit 100 and power transfer module 101; and the protection module 103 that is connected with power transfer module 101 outputs 106 among Fig. 1; be connected to the input 105 of power transfer module 101; and the output 106 of above-mentioned power transfer module 101 and an end of detection module 102, and the other end of this detection module 102 is connected with protection module 103.This kind mode is that main input 105 to power transfer module 101 carries out overvoltage protection, and fuse 107 obtains one deck protection, and promptly excessive when the output end current of power supply unit 100, then this fuse 107 just fuses power output end is cut off.Perhaps output 106 voltages that detect power transfer module 101 when detection module 102 are higher than the maximum stop voltage of load 104, and then the trigger protection module 103, and protection module 103 is with the input 105 voltage ground connection of power transfer module 101.
In addition, as shown in Figure 3, also has a kind of existing excess voltage protection.It also connects a protection module 103 in addition at the output 106 of power transfer module 101 for overvoltage crowbar shown in Figure 2, this protection module 103 also is connected in detection module 102.Played duplicate protection under this kind mode, promptly input 105 and the output 106 in power transfer module 101 carries out overvoltage protection.
Above-mentioned three various ways, though played the overvoltage protection effect to a certain extent, relative components and parts, its cost can increase, and aforesaid way to superpotential moment reagency not strong; And electric current is excessive and be easy to cause ground connection incomplete under above-mentioned three kinds of circuit protections, allows main damage parts, promptly when causing circuit unusual, may cause the safety problem that expensive CPU and Memory damage or electric capacity is got angry.
Summary of the invention
In view of the above problems, the main purpose of the utility model is to provide a kind of excess voltage protection, and it can realize superpotential moment reaction is made overvoltage protection timely to circuit.
To achieve the above object, the utility model has adopted following technical proposals: in this excess voltage protection system architecture, protection module is directly connected in power supply unit, and is connected with the overcurrent protection control module of Voltage Supply Device; Utilize the overcurrent protection of this power supply unit, thereby go to control the voltage output of power supply unit.
This excess voltage protection system mainly comprises a power transfer module, a detection module and a protection module, in addition, also comprises a power supply unit, comprises an overcurrent protection module in this power supply unit.Described power transfer module comprises an input and output, and its input is connected with power supply unit; Its output then is to be connected in load, and also is connected with an end of described detection module.The other end of described detection module then is to link to each other with protection module, and this protection module system is connected in the overcurrent protection module in the power supply unit.
By technique scheme, excess voltage protection described in the utility model, fast at the reaction of overvoltage transient protection, and ground connection is complete, is difficult for causing main damage parts.
Description of drawings
Fig. 1 is one of existing excess voltage protection system architecture diagram;
Fig. 2 is two of an existing excess voltage protection system architecture diagram;
Fig. 3 is three of an existing excess voltage protection system architecture diagram;
Fig. 4 is the utility model excess voltage protection system architecture diagram;
Fig. 5 is the local physical circuit figure of the utility model overvoltage protection.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
As shown in Figure 4, be the system architecture diagram of excess voltage protection described in the utility model.Power supply unit 100 is connected with the input 105 of power transfer module 101 and an end of protection module 103 respectively among the figure; The output 106 of described power transfer module 101 is connected in an end of load 104 and detection module 102; The other end of described protection module 103 then is the other end that is connected in detection module 102.
Consult shown in Figure 5ly, be excess voltage protection part physical circuit figure.Described power supply unit 100 includes a voltage transformation module 200, a voltage output module 201 and an overcurrent protection control module 203, and described voltage transformation module 200 1 ends can change with extraneous AC power and be connected, and an end links to each other with voltage output module 201; And voltage output module 201 also is connected with overcurrent protection control module 203.When the output end current of power supply unit 100 exceeds its maximum current limit, described overcurrent protection control module 203 will be triggered, thereby reduce or close the voltage output of voltage output module 201, thereby reach certain circuit protection effect.
Described power supply unit 100 links to each other with power transfer module 101 by a power connector 204, and the pin of this power connector 204 is corresponding with the voltage output pin of power supply unit 100.
In the present embodiment, described power connector 204 is connected with described power supply unit 100.Wherein, by first pin, 300 outputs, one positive 12 volts of voltages of described power connector 204, and be connected in the input 105 that power supply changes modular converter 101; Second pin 301 is exported positive 5 volts of voltages, and is connected with an end of first resistance 400, second resistance 401, the 3rd resistance 402 and the 4th resistance 403.Its second pin 301 also is connected with the negative input 701 of first comparator 500, second comparator 501, the 3rd comparator 502 and the 4th comparator 503 respectively in addition, and a reference voltage is provided; And its 3rd pin 302 outputs one negative 12 volts of voltages, the 3rd pin 302 is connected with protection module 103, it is its drain electrode that is connected in transistor 208, and the grid of this transistor 208 is connected with the negative electrode of described first diode 600, second diode 601, the 3rd diode 602 and the 4th diode 603 respectively, and also links to each other with the anode of described the 5th diode 604; And the anode of above-mentioned first diode 600, second diode 601, the 3rd diode 602 and the 4th diode 603 also links to each other with the 4th resistance 403 with first resistance 400, second resistance 401, the 3rd resistance 402 respectively, and the output 702 of first comparator 500, second comparator 501, the 3rd comparator 502 and the 4th comparator 503 connects.In addition, the negative electrode of described the 5th diode 604 is connected to the positive input 700 of first comparator 500, second comparator 501, the 3rd comparator 502 and the 4th comparator 503.And the setting of comparator, resistance and diode in above-mentioned detection module 102 can be set according to concrete load is needed.
In addition, described power transfer module 101 is connected with described detection module 102, and promptly the positive input 700 with first comparator 500, second comparator 501, the 3rd comparator 502 and the 4th comparator 503 links to each other; And also connecting load 104, output services voltage is in load 104 usefulness.
Described first resistance 400, second resistance 401, the 3rd resistance 402 and the 4th resistance 403 are when overvoltage; on draw and keep the output current potential of above-mentioned comparator; make described first diode 600, second diode 601, the 3rd diode 602 and the 4th diode 603 keep conducting within a certain period of time; and be unlikely to only just start a little of overvoltage protection, promptly do not reach essence overvoltage protection to circuit.
After power supply unit 100 connected AC power, its builtin voltage conversion module 200 conversion of process were after by its voltage output module 201 outputs, export power transfer module 101 to via power connector 204.Circuit begins to realize its protective effect; when if the output voltage after power transfer module 101 conversion surpasses the maximum voltage value that the load 104 of default limited; detection module 102 is triggered; first comparator 500; second comparator 501; the voltage of the positive input 700 of the 3rd comparator 502 and the 4th comparator 503 can be higher than from the voltage by 301 outputs of power connector 204 second pins; thereby from first comparator 500; second comparator 501; the output 702 of the 3rd comparator 502 and the 4th comparator 503 just can be exported a high potential, and makes the diode 600 of winning; second diode 601; the 3rd diode 602 and 603 conductings of the 4th diode.Simultaneously, export the grid of a high potential to transistor 208, transistor 208 is able to conducting.At this moment; power supply unit 100; promptly pass through negative 12 volts of voltage ground connection of power connector 204 the 3rd pin 302 outputs; behind its instant earthing, its current change quantity is very big, will surpass its rated current; the overcurrent protection control module 203 of power supply unit 100 is triggered; thereby remove to control the voltage output module 201 in the power supply unit 100, reduce or close its voltage output, promptly overvoltage protection has been made in load.
Negative 12 volts voltages to above-mentioned power supply unit 100 carry out ground connection, thereby trigger in the power supply unit 100 overcurrent protection control module 203, go to reduce or the voltage of powered-down supply 100 is exported.Existing power supply unit 100, its voltage that provides all is not quite similar, this aforesaid way, it all can select the minimum output voltage of power supply unit 100 outputs.
Claims (4)
1. excess voltage protection, it is characterized in that: this circuit comprises a power supply unit; One power transfer module, it is connected with above-mentioned power supply unit, and comprises an input and an output, its input and above-mentioned power supply unit; One detection module, the one end is connected with the output of above-mentioned power transfer module; And a protection module, the one end is connected with above-mentioned detection module, and the other end is connected to above-mentioned power supply unit.
2. according to the described excess voltage protection of claim 1, it is characterized in that: described protection module can be an insulation lock field effect transistor.
3. according to the described excess voltage protection of claim 1, it is characterized in that: described power supply unit comprises an overcurrent protection control module.
4. according to the described excess voltage protection of claim 1, it is characterized in that: described protection module is to be connected with described overcurrent protection control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620056481 CN2907021Y (en) | 2006-03-20 | 2006-03-20 | Over-voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620056481 CN2907021Y (en) | 2006-03-20 | 2006-03-20 | Over-voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2907021Y true CN2907021Y (en) | 2007-05-30 |
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ID=38115666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620056481 Expired - Lifetime CN2907021Y (en) | 2006-03-20 | 2006-03-20 | Over-voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2907021Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546962B (en) * | 2008-03-26 | 2011-08-24 | 鸿富锦精密工业（深圳）有限公司 | Power supply device |
| CN102856880A (en) * | 2011-06-28 | 2013-01-02 | 鸿富锦精密工业（深圳）有限公司 | Power supply overvoltage protecting circuit |
| TWI699948B (en) * | 2019-12-04 | 2020-07-21 | 上銀科技股份有限公司 | Fan protection device |
| CN113013842A (en) * | 2019-12-19 | 2021-06-22 | 上银科技股份有限公司 | Fan protection device |
-
2006
- 2006-03-20 CN CN 200620056481 patent/CN2907021Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546962B (en) * | 2008-03-26 | 2011-08-24 | 鸿富锦精密工业（深圳）有限公司 | Power supply device |
| CN102856880A (en) * | 2011-06-28 | 2013-01-02 | 鸿富锦精密工业（深圳）有限公司 | Power supply overvoltage protecting circuit |
| TWI699948B (en) * | 2019-12-04 | 2020-07-21 | 上銀科技股份有限公司 | Fan protection device |
| CN113013842A (en) * | 2019-12-19 | 2021-06-22 | 上银科技股份有限公司 | Fan protection device |
| CN113013842B (en) * | 2019-12-19 | 2024-05-03 | 上银科技股份有限公司 | Fan protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070530 |
|
| EXPY | Termination of patent right or utility model |