CN1512641A - 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
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- CN1512641A CN1512641A CNA021594635A CN02159463A CN1512641A CN 1512641 A CN1512641 A CN 1512641A CN A021594635 A CNA021594635 A CN A021594635A CN 02159463 A CN02159463 A CN 02159463A CN 1512641 A CN1512641 A CN 1512641A
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Abstract
A detection and protection device against supply short circuit is to utilize a special detecting circuit on the CB and standard ATX power with a standby supply to realize detection, alarm and protection for fortuitous short circuit before switching. The special detection circuit is composed of a trigger switch, an impedance-voltage converter, a voltage comparer, an alarm control circuit, an alarm display circuit and a protection circuit connected sequently. when necessary, the trigger switch cuts-in the tested supply and detection circuit, after converting the earth impedance value of the tested supply to voltage value, it is compared with the preset reference voltage to generate a normal or an alarm signal, the detection and the tested power are cut after the trigger cuts off to operate or remove faults, when short circuit happens, the protection circuits stops ATX power 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 power supply to be measured, the dedicated test circuit is by the needed standard A TX power supply power supply with Standby power supply of electronic equipment wiring board itself; The preset parameter testing circuit converts the earth impedance value of tested power supply to magnitude of voltage 1, compares the normal value of the reference voltage level 2 representatives power supply earth impedance to be measured of this undetermined parameter testing circuit output with the reference voltage level of being exported by the undetermined parameter testing circuit 2; When magnitude of voltage 1 during greater than reference voltage level 2, the power supply normal signal of dedicated test circuit export target components and parts; When magnitude of voltage 1 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 2.
Described preset parameter testing circuit is linked in sequence with protective circuit by touch switch, impedance-to-voltage converter, voltage comparator, display control circuit, warning circuit and forms: the output of impedance-to-voltage converter is connected an input of voltage comparator; another input of voltage comparator connects the undetermined parameter circuit; one end of touch switch connects impedance-to-voltage converter, and its other end is connected with power supply to be measured.
Described impedance-to-voltage converter 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 magnitude of voltage 1.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-to-voltage converter.The V_STB power supply power supply that this resistance pressure-dividing network is transformed by the 5V Standby of ATX power supply.
Described undetermined parameter testing circuit is a reference voltage potential-divider network, its output reference voltage value 2.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.
The input port of 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-to-voltage converter
3---voltage comparator 4---display control circuit
5---warning circuit 6,7---reference voltage potential-divider network
8,9---power supply 10---to be measured 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 power supply to be measured, 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-to-voltage converter (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 V_STB that is transformed by the 5V Standby from the ATX power supply powers.One 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 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 V_STB.
Voltage comparator (3) adopts the low two voltage comparators (as LM393) that depart from input voltage.
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) output, 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 level, 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.
Warning circuit (5) adopts LED to show, also can select for use other modes to show.
It is the control core circuit with the trigger that protective circuit (10) is one, with the d type flip flop is example, referring to Fig. 4, the input signal of protective circuit is that the output of display control section (directly or through logical operation after) is testing result, it is via the clock signal terminal of resistance R 8 connection d type flip flops, and its rising edge make the trigger upset with triggering can for d type flip flop; The removing end of d type flip flop connects V_STB through resistance R 9; Power pin and the V_STB that is connected to d type flip flop through the delay network of being made up of capacitor C E1 and resistance R 10 held in presetting of d type flip flop; The data terminal of d type flip flop is through a current-limiting resistance ground connection; The earth terminal ground connection of d type flip flop; The negative output terminal of d type flip flop is vacant; The positive output end of d type flip flop is connected to board chip set and issues the power management control signal of Super I/O or ATX power supply (issuing the SLPS4# of Super I/O or PWRCTRL# etc. as board chip set), thus the switch of control ATX power supply.
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 level; 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 (10)
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 power supply to be measured, the dedicated test circuit is by the needed standard A TX power supply power supply with Standby power supply of electronic equipment wiring board itself; The preset parameter testing circuit converts the earth impedance value of tested power supply to magnitude of voltage 1, compare the lower limit of the normal value of the reference voltage level 2 representatives power supply earth impedance to be measured of this undetermined parameter testing circuit output with reference voltage level 2 by the output of undetermined parameter testing circuit; When magnitude of voltage 1 during greater than reference voltage level 2; the power supply normal signal of dedicated test circuit export target components and parts; when magnitude of voltage 1 during less than reference voltage level 2; 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 linked in sequence with protective circuit by touch switch, impedance-to-voltage converter, voltage comparator, display control circuit, warning circuit and forms: the output of impedance-to-voltage converter is connected an input of voltage comparator; another input of voltage comparator connects the undetermined parameter circuit; one end of touch switch connects impedance-to-voltage converter, and its other end is connected with power supply to be measured.
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-to-voltage converter 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 magnitude of voltage 1.
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 2.
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; 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-to-voltage converter.The V_STB power supply power supply that this resistance pressure-dividing network is transformed by the 5V Standby 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 6ly 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: the electric capacity in the described reference voltage potential-divider network is used to eliminate noise, can increase and decrease according to actual conditions.
8, describedly 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 according to claim 4 or 6: the parameter value of dividing potential drop components and parts in the described reference voltage potential-divider network, only selected according to the loadtype on the tested power supply.
9, 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: the input port of described display control circuit is made of TTL circuit or logic " door " circuit; can allow to be connected, control alarm indication with the result of the integrated logic computing of carrying out the several testing result with the output of the voltage comparator of several testing circuit.
10, 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 to be the control core circuit with the trigger, the output of testing circuit display control section can make the trigger upset via the signal end of resistance connection trigger; 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 |
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| Publication Number | Publication Date |
|---|---|
| CN1512641A true CN1512641A (en) | 2004-07-14 |
| CN100346549C CN100346549C (en) | 2007-10-31 |
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| 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 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064517A (en) * | 2010-08-24 | 2011-05-18 | 深圳市九洲电器有限公司 | Set top box and antenna short circuit protection module thereof |
| CN101563824B (en) * | 2006-12-22 | 2012-04-04 | Abb研究有限公司 | System and method to determine the impedance of a disconnected electrical facility |
| CN104375048A (en) * | 2013-08-13 | 2015-02-25 | 现代摩比斯株式会社 | 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 |
| CN110031742A (en) * | 2018-01-12 | 2019-07-19 | 神讯电脑(昆山)有限公司 | Wiring board connects tin detection circuit |
| CN112188669A (en) * | 2019-07-04 | 2021-01-05 | 力林科技股份有限公司 | LED backlight system and LED control circuit |
| CN113376544A (en) * | 2020-03-10 | 2021-09-10 | 安徽精卓光显技术有限责任公司 | Method and device for detecting circuit abnormality in film material, storage medium and terminal |
Family Cites Families (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 |
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2002
- 2002-12-31 CN CNB021594635A patent/CN100346549C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101563824B (en) * | 2006-12-22 | 2012-04-04 | Abb研究有限公司 | System and method to determine the impedance of a disconnected electrical facility |
| CN102064517A (en) * | 2010-08-24 | 2011-05-18 | 深圳市九洲电器有限公司 | Set top box and antenna short circuit protection module thereof |
| CN104375048A (en) * | 2013-08-13 | 2015-02-25 | 现代摩比斯株式会社 | Apparatus and method for detecting short circuit of inverter system |
| CN104375048B (en) * | 2013-08-13 | 2018-09-25 | 现代摩比斯株式会社 | The short-circuit detecting device and its method 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 |
| CN110031742A (en) * | 2018-01-12 | 2019-07-19 | 神讯电脑(昆山)有限公司 | Wiring board connects tin detection circuit |
| CN110031742B (en) * | 2018-01-12 | 2022-07-15 | 神讯电脑(昆山)有限公司 | Circuit board tin connection detection circuit |
| CN112188669A (en) * | 2019-07-04 | 2021-01-05 | 力林科技股份有限公司 | LED backlight system and LED control circuit |
| CN113376544A (en) * | 2020-03-10 | 2021-09-10 | 安徽精卓光显技术有限责任公司 | Method and device for detecting circuit abnormality in film material, storage medium and terminal |
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| Publication number | Publication date |
|---|---|
| CN100346549C (en) | 2007-10-31 |
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