CN100346549C - Detecting and protective device for preventing device frmo forming short circuit on circuit board - Google Patents
Detecting and protective device for preventing device frmo forming short circuit on circuit board Download PDFInfo
- Publication number
- CN100346549C CN100346549C CNB021594635A CN02159463A CN100346549C CN 100346549 C CN100346549 C CN 100346549C CN B021594635 A CNB021594635 A CN B021594635A CN 02159463 A CN02159463 A CN 02159463A CN 100346549 C CN100346549 C CN 100346549C
- Authority
- CN
- China
- Prior art keywords
- circuit
- power supply
- voltage
- impedance
- wiring board
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000001681 protective effect Effects 0.000 title claims description 34
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000012360 testing method Methods 0.000 claims description 41
- 230000015654 memory Effects 0.000 description 8
- 230000006870 function Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a detection and protection device for preventing components on a circuit board from generating power source short circuit. A special detection circuit arranged on an electronic device circuit board and a standard ATX power source with the Standby power supply are used, and the standard ATX power source with the Standby power supply are needed by the electronic device circuit board self. The detection, the alarm and the protection are realized to accidental short circuit before powerup and starting-up are realized. The special detection circuit is composed of a contact switch, an impedance voltage converter, a voltage comparator, an alarm control circuit, an alarm display circuit and a protection circuit which are connected successively. When necessary, the contact switch is used for causing a measured power source and the detection circuit to be switched on; after the earth impedance value of the measured power source is converted to a voltage value, the voltage value is compared with a predetermined reference voltage value which represents normal impedance and generates a normal signal or an alarm signal. After the contact switch is disconnected, the detection circuit and the measured power source are disconnected so that a user can normally start up or eliminate failure; after short closed-circuit failure occurs, the protection circuit in the special detection circuit prevents the ATX power source to be powered on.
Description
Technical field
The present invention relates to a kind of short-circuit detecting and protective device of wiring board, particularly a kind ofly prevent that the components and parts on the computer main frame panel from causing the detection and the protective device of short circuit.
Background technology
Along with fast development of computer technology, the performance and the integrated level of computer are more and more higher, and the number of pins of critical components such as central processing unit (CPU), internal memory is crypto set more also, and be corresponding, and it is quite accurate that the socket on the motherboard also becomes.In system assembles or transportation, because the arrangement of jack is very tight on the motherboard, be easy to operate lack of standardization or the pin that makes CPU and internal memory that collides with misplaces, tilts, be short-circuited after causing CPU and internal memory to be installed, can burn CPU and internal memory and motherboard once start because of the user.For preventing that short circuit from taking place; at present a lot of producers are integrated overcurrent protection function on CPU power supply circuits control chip all; when having short circuit to take place in the course of work; output current moment of power supply circuits increases considerably; as surpassing the chip preset threshold; then the power supply circuits control chip can cut off power supply output automatically, thereby plays a protective role.
Yet above-mentioned short-circuit protection method still has following deficiency:
1. said method mainly avoids short circuit to consider from the product design angle, but can not effectively control and protect for the link that needs user's (comprising assembling production and end user) operation in the practical application.
2. said method only just can play when protective circuit is in normal operating conditions and detect and protective effect, and finishes from system's power supply circuits control chip reset initialization that powers on usually, enters normal operating conditions, wants up to a hundred milliseconds of times at least.If be short-circuited before powering on, come into force during this period of time from system's protective current function that powers on so, the powerful electric current that produces because of short circuit is enough to make operating voltage to have only 1 several volts precise parts such as CPU to burn.
3. said method belongs to the additional function of power supply circuits control chip usually, and its concrete function, implementation method, reliability etc. all there are differences because of the different designs of different manufacturers, can not be transplanted to multiple different electronic equipment.
Summary of the invention
For overcoming the deficiency of existing short-circuit protection method; the object of the present invention is to provide and a kind ofly new prevent that the components and parts on the wiring board from causing the detection and the protective device of short circuit; to having the computer that relies on the complicated components and parts (as CPU and internal memory) that connector is connected with wiring board; accidental short circuit before the start that powers on detects, thereby plays the effect of expensive connector blocks such as protection CPU, internal memory.
The technical problem underlying that the present invention solves realizes by the following technical solutions: a kind ofly prevent that the components and parts on the wiring board from causing the protective device of short circuit, the dedicated test circuit that comprises preset parameter testing circuit and undetermined parameter testing circuit is installed on the electronic equipment wiring board, and be connected with tested power supply, the dedicated test circuit is by the needed standard A TX power supply power supply with stand-by power supply power supply of electronic equipment wiring board itself; The preset parameter testing circuit converts the earth impedance value of tested power supply to first magnitude of voltage, compare with the reference voltage level by the output of undetermined parameter testing circuit, the reference voltage level of this undetermined parameter testing circuit output is represented the normal value of tested power supply earth impedance; When first magnitude of voltage during greater than reference voltage level, the power supply normal signal of dedicated test circuit export target components and parts; When first magnitude of voltage during, dedicated test circuit output alarm signal, and produce the power management control signal, stop described ATX power supply electrifying by protective circuit less than reference voltage level.
Described preset parameter testing circuit is linked in sequence with protective circuit by touch switch, impedance voltage transducer, voltage comparator, display control circuit, warning circuit and forms: the output of impedance voltage transducer is connected an input of voltage comparator; another input of voltage comparator connects the undetermined parameter circuit; one end of touch switch connects the impedance voltage transducer, and its other end is connected with tested power supply.
Described impedance voltage transducer is by the dc impedance over the ground of tested power supply is in parallel with a resistance pressure-dividing network, converts the value of dc impedance over the ground of tested power supply to first magnitude of voltage.Resistance pressure-dividing network is composed in series by two resistance, and its resistance determines that according to the loadtype of tested power supply the tie point of two resistance promptly is the tie point of touch switch and impedance voltage transducer.The power supply V_STB power supply that this resistance pressure-dividing network is transformed by the 5V stand-by power supply of ATX power supply.
Described undetermined parameter testing circuit is a reference voltage potential-divider network, its output reference voltage value.The reference voltage potential-divider network, is composed in series with second resistance with after filter capacitor is in parallel by first resistance again.Wherein filter capacitor can increase and decrease according to actual conditions.The parameter value of each dividing potential drop components and parts, only selected according to the loadtype on the tested power supply.
Described display control circuit is made of TTL circuit and/or logic " door " circuit, can allow to be connected with the output of the voltage comparator of several testing circuit.
It is the control core circuit with the D flip-flop that described protective circuit is one, and the output of testing circuit display control section is via the clock signal terminal of a resistance connection d type flip flop, and its rising edge can make the d type flip flop upset; The positive output end of d type flip flop is connected to the power management control signal on the wiring board, with the switch of control circuit board power supply.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, the present invention can detect the circuit board component short circuit that device assembles and carrying etc. causes, and when being short-circuited, can in time cut off the electricity supply, and burns expensive connector blocks such as CPU, internal memory when avoiding powering on start.After circuit duplicates expansion by actual needs, can realize the more multiple power supplies of electronic equipment is detected protection.When the present invention is applied to motherboard manufacturing or system's production test, can replace partial test equipment, thereby save cost.
The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is a motherboard testing circuit block diagram of the present invention.
Fig. 2 is resistance pressure-dividing network figure
Fig. 3 is reference voltage potential-divider network figure
Fig. 4 is protective circuit figure
Among the figure:
1---touch switch 2---impedance voltage transducer
3---voltage comparator 4---display control circuit
5--- warning circuit 6,7---reference voltage potential-divider network
8, the tested power supply 10---of 9---protective circuit
Embodiment
The present invention is specially adapted to the short-circuit detecting and the protection of the complicated components and parts that are connected with electronic circuit board by connector, will be example with components and parts such as the CPU on the computer main frame panel, internal memories below, and short-circuit detecting of the present invention and protective device are elaborated.
See also Fig. 1, the present invention prevents that components and parts on the wiring board from causing the detection and the protective device of short circuit, the dedicated test circuit that comprises that preset parameter testing circuit and undetermined parameter testing circuit constitute is installed on motherboard, and wherein the preset parameter testing circuit comprises: touch switch 1, impedance voltage change-over circuit 2, voltage comparator 3, control circuit 4, warning circuit 5 and protective circuit 10; Undetermined parameter testing circuit wherein is exactly the reference voltage potential-divider network 6 shown in the figure.The preset parameter testing circuit mainly consists of: an end of touch switch 1 connects tested power supply, and the other end connects impedance voltage change-over circuit 2; The output of impedance voltage change-over circuit 2 connects "+" input of voltage comparator 3, "-" input of voltage comparator 3 connects reference voltage potential-divider network 6; The output of voltage comparator 3 connects the input of display control circuit 4; The output of control circuit 4 connects warning circuit 5; The output of warning circuit 5 connects protective circuit 10.
Please in conjunction with Fig. 2, impedance voltage transducer 2 by with tested power supply over the ground dc impedance be parallel in the resistance pressure-dividing network and constitute.Resistance pressure-dividing network is composed in series by resistance R 3, R4, and the power supply V_STB that is transformed by the 5V stand-by power supply from the ATX power supply powers.The end of touch switch SW1 connects the tie point of R3, R4, and the other end connects tested power supply VCC_CPU.When SW1 connects, the tested power supply and the resistance pressure-dividing network that connect load are connected, its dc impedance is parallel to the lower end resistance R 4 of potential-divider network, the voltage ratio of resistance pressure-dividing network is changed, and this voltage ratio can be along with the variation that is connected on the dc impedance of load on the tested power supply difference, thereby will connect the dc impedance of the tested power supply of load, show with the variation of resistance pressure-dividing network output voltage values.The partial pressure device value of this resistance pressure-dividing network is determined according to loadtype on the tested power supply, consider certainty of measurement, the partial pressure device resistance should be tried one's best greatly, and as far as possible near normal dc impedance on the tested power supply that is added with load, also will consider the influence of the error profile parameter of partial pressure device.The power supply V_STB supply power voltage value of this resistance pressure-dividing network is determined according to tested power supply nominal voltage and potential-divider network resistance value.
As shown in Figure 3, reference voltage potential-divider network 6 by capacitor C 1 and resistance R 2 in parallel after, the formation of connecting with resistance R 1 again.Choosing of each partial pressure device value is very crucial, need determine according to the cpu type of the motherboard support just of loadtype on the tested power supply, the reference voltage level that potential-divider network provided, need big as far as possible, but must all can support the magnitude of voltage that the lower limit of the normal dc impedance over the ground of power pins of CPU is exported by aforementioned resistance pressure-dividing network less than this equipment (as motherboard), and will consider the precision influence of partial pressure device.The selected back of components and parts value is fixed when motherboard designs.This reference voltage potential-divider network 6 is powered by power supply V_STB.
Represent the magnitude of voltage of the resistance pressure-dividing network output of tested power supply dc impedance to compare by voltage comparator 3 with the reference voltage level of reference voltage potential-divider network 6 outputs, when "+" input terminal voltage value of the tested source impedance of representative is higher than reference voltage level, voltage comparator 3 output high level, the tested power supply that expression connects load dc impedance does not over the ground have short circuit to take place greater than default normal impedance; And when "+" input terminal voltage value of the tested source impedance of representative when being lower than reference voltage level, voltage comparator 3 output low levels, the tested power supply that expression connects load dc impedance is over the ground thought to be short-circuited less than default normal impedance.
Display control circuit 4 is made up of TTL circuit and/or logic " door " circuit.When needs detect multiple power supplies simultaneously, each road testing result can be exported respectively, the warning circuit of drive back also can carry out logical operation with testing result so that realize fault location as early as possible, drives a warning circuit jointly.
When voltage comparator 3 output high level, it is bright then to drive green indicating lamp, represents that all are normal, does not have short circuit to take place, and can unclamp touch switch, tested power supply and testing circuit disconnection, and detection is finished, can normal boot-strap; If voltage comparator 3 output low levels; the red led that then drives current tested this road power supply is reported to the police; remind the current tested power supply of user to be short-circuited; simultaneously the result is exported to protective circuit 10, make the D flip-flop of protective circuit 10 overturn, the out-put supply supervisory control signals; and keep always; the user need unclamp touch switch and made the disconnection of tested power supply and testing circuit this moment, pulled out the ATX attaching plug thoroughly to cut off the electricity supply, and further checked the short circuit cause.Even the user does not see or the LED display alarm of ignoring warning circuit 5 by force by the start button because protective circuit control power managing signal is arranged, also can't start the ATX power supply, fundamentally protected mainboard and CPU, avoided loss.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, current at the integrated circuit industry high speed development particularly, the circuit of several functions is integrated in the integrated circuit has become very usual thing, can realize multiple model also being arranged with a kind of integrated circuit of function, in every case be to any simple modification that above embodiment did (for example use major function identical and integrated circuit that model is different) according to technical spirit of the present invention, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (8)
1, a kind ofly prevents that the components and parts on the wiring board from causing the detection and the protective device of short circuit, it is characterized in that: the dedicated test circuit that comprises preset parameter testing circuit and undetermined parameter testing circuit is installed on the electronic equipment wiring board, and be connected with tested power supply, the dedicated test circuit is by the needed standard A TX power supply power supply with stand-by power supply power supply of electronic equipment wiring board itself; Impedance voltage transducer in the preset parameter testing circuit converts the earth impedance value of tested power supply to first magnitude of voltage, voltage comparator compares the reference voltage level of first magnitude of voltage and the output of undetermined parameter testing circuit, and the reference voltage level of this undetermined parameter testing circuit output is represented the lower limit of the normal value of tested power supply earth impedance; When first magnitude of voltage during greater than reference voltage level; the power supply normal signal of dedicated test circuit export target components and parts; when first magnitude of voltage during less than reference voltage level; dedicated test circuit output alarm signal; and, stop described ATX power supply electrifying by protective circuit generation power management control signal.
2; according to claim 1ly prevent that the components and parts on the wiring board from causing the detection and the protective device of short circuit; it is characterized in that: described preset parameter testing circuit is by touch switch; the impedance voltage transducer; voltage comparator; display control circuit; warning circuit and the above-mentioned protective circuit composition that is linked in sequence: the output of impedance voltage transducer is connected an input of voltage comparator; another input of voltage comparator connects the undetermined parameter testing circuit; one end of touch switch connects the impedance voltage transducer; its other end is connected with tested power supply, and described display control circuit is made of TTL circuit or logic " door " circuit.
3, according to claim 2ly prevent that the components and parts on the wiring board from causing the detection and the protective device of short circuit; it is characterized in that: described impedance voltage transducer is by the dc impedance over the ground of tested power supply is in parallel with a resistance pressure-dividing network, converts the value of dc impedance over the ground of tested power supply to first magnitude of voltage.
4, according to claim 1ly prevent that the components and parts on the wiring board from causing the detection and the protective device of short circuit, is characterized in that: described undetermined parameter testing circuit is a reference voltage potential-divider network, its output reference voltage value.
5, according to claim 3ly prevent that the components and parts on the wiring board from causing the detection and the protective device of short circuit; it is characterized in that: described resistance pressure-dividing network is composed in series by two resistance; the tie point of two resistance promptly is the tie point of touch switch and impedance voltage transducer, power supply (V_STB) power supply that this resistance pressure-dividing network is transformed by the 5V stand-by power supply of ATX power supply.
6, according to claim 4ly prevent that the components and parts on the wiring board from causing the detection and the protective device of short circuit, is characterized in that: described reference voltage potential-divider network, is composed in series with second resistance with after electric capacity is in parallel by first resistance again.
7, according to claim 2ly prevent that the components and parts on the wiring board from causing the detection and the protective device of short circuit, is characterized in that: described display control circuit is connected with the output of the voltage comparator of multichannel preset parameter testing circuit.
8, according to claim 2ly prevent that the components and parts on the wiring board from causing the detection and the protective device of short circuit, it is characterized in that: described protective circuit is the control circuit with trigger, the output of the display control circuit in the preset parameter testing circuit connects the signal end of trigger through a resistance, when the voltage comparator output low level, make the trigger upset; The output of trigger is connected to the power management control signal on the wiring board, with the switch of control circuit board power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021594635A CN100346549C (en) | 2002-12-31 | 2002-12-31 | Detecting and protective device for preventing device frmo forming short circuit on circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021594635A CN100346549C (en) | 2002-12-31 | 2002-12-31 | Detecting and protective device for preventing device frmo forming short circuit on circuit board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1512641A CN1512641A (en) | 2004-07-14 |
| CN100346549C true CN100346549C (en) | 2007-10-31 |
Family
ID=34237480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021594635A Expired - Fee Related CN100346549C (en) | 2002-12-31 | 2002-12-31 | Detecting and protective device for preventing device frmo forming short circuit on circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100346549C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1936773A1 (en) * | 2006-12-22 | 2008-06-25 | Abb Research Ltd. | System and method to detect a forgotten safety ground of an electrical facility |
| CN102064517B (en) * | 2010-08-24 | 2013-08-28 | 深圳市九洲电器有限公司 | Set top box and antenna short circuit protection module thereof |
| KR20150019224A (en) * | 2013-08-13 | 2015-02-25 | 현대모비스 주식회사 | Apparatus and Method for detecting short circuit of inverter system |
| CN105824731A (en) * | 2016-04-05 | 2016-08-03 | 浪潮电子信息产业股份有限公司 | Connector abnormal-contact detection circuit, method and server |
| CN107643468A (en) * | 2017-09-29 | 2018-01-30 | 惠州华阳通用电子有限公司 | A kind of alarm validation checking circuit and method |
| CN110031742B (en) * | 2018-01-12 | 2022-07-15 | 神讯电脑(昆山)有限公司 | Circuit board connection tin detection circuit |
| TWI749339B (en) * | 2019-07-04 | 2021-12-11 | 力林科技股份有限公司 | Light emitting diode backlight system and light emitting diode control circuit |
| CN113376544B (en) * | 2020-03-10 | 2024-10-25 | 安徽精卓光显技术有限责任公司 | Method and device for detecting line abnormality in film material, storage medium and terminal |
| CN112462241A (en) * | 2020-12-07 | 2021-03-09 | 福建实达电脑设备有限公司 | Short circuit detection circuit and short circuit detection method for detecting mainboard |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86209954U (en) * | 1986-12-01 | 1988-04-20 | 王剑锋 | Automatic repositioner of electric shock protective device |
| US5467240A (en) * | 1993-09-30 | 1995-11-14 | Caterpillar Inc. | Driver circuit with diagnostics and over voltage protection |
| CN1344052A (en) * | 2000-09-19 | 2002-04-10 | 钟汝祥 | Switch with electric damage protection before starting |
-
2002
- 2002-12-31 CN CNB021594635A patent/CN100346549C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86209954U (en) * | 1986-12-01 | 1988-04-20 | 王剑锋 | Automatic repositioner of electric shock protective device |
| US5467240A (en) * | 1993-09-30 | 1995-11-14 | Caterpillar Inc. | Driver circuit with diagnostics and over voltage protection |
| CN1344052A (en) * | 2000-09-19 | 2002-04-10 | 钟汝祥 | Switch with electric damage protection before starting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1512641A (en) | 2004-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8067944B2 (en) | USB component tester | |
| EP2669693B1 (en) | Parallel operation wire fault detection device and system | |
| CN102981093B (en) | Test system for central processing unit (CPU) module | |
| CN100346549C (en) | Detecting and protective device for preventing device frmo forming short circuit on circuit board | |
| US20140009179A1 (en) | Testing device | |
| CN115808640A (en) | Power failure detection circuit, method, system, electronic device and storage medium | |
| US7216241B2 (en) | Self-testing power supply which indicates when an output voltage is within tolerance while not coupled to an external load | |
| KR100851147B1 (en) | a dual power system using smart junction box and a line short detection method of the system | |
| CN106300642A (en) | A kind of dual power supply redundancy cold standby circuit with power supply status output | |
| CN100414796C (en) | Voltage undervoltage isolation monitoring circuit | |
| CN211653795U (en) | Tamper pin extension circuit and POS machine | |
| CN2898939Y (en) | Automatic counter for testing power-supply switch state circulation | |
| CN115728665A (en) | A power failure detection circuit, method and system | |
| CN114734941A (en) | Vehicle body control system and method matched with different wire diameters | |
| CN111506474B (en) | A circuit board reliability monitoring device and a server | |
| CN220340680U (en) | Server fan monitoring system | |
| CN111736088A (en) | Power state indicating circuit | |
| CN221804199U (en) | A test board for testing vulnerable drive chips of new energy | |
| CN1761167A (en) | Equiment for realizing high usability of system | |
| US20250208945A1 (en) | Fault detection system, storage device and server | |
| TWI874142B (en) | Transmission interface circuit and method for performing over-voltage protection in transmission interface circuit | |
| CN223022324U (en) | A circuit, system and computer for chip debugging | |
| CN220913297U (en) | Blade board installation detection circuit, blade server and detection equipment | |
| CN218771258U (en) | Electric leakage locking protection circuit | |
| CN214151684U (en) | Mainboard assembly with monitoring function and system thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071031 Termination date: 20201231 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |