CN1366186A - Open circuit/short circuit detector and its detection method - Google Patents
Open circuit/short circuit detector and its detection method Download PDFInfo
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- CN1366186A CN1366186A CN 01145365 CN01145365A CN1366186A CN 1366186 A CN1366186 A CN 1366186A CN 01145365 CN01145365 CN 01145365 CN 01145365 A CN01145365 A CN 01145365A CN 1366186 A CN1366186 A CN 1366186A
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Abstract
The ivnention relates to a device and method for detecting open circuit/short circuit of circuit board. The circuit board contains a pin seat that connects to a chip and a multi-terminal resistance electrically. The circuit includes a power supply, a detector, a changeover circuit, a controlling circuit and an alarm. The detector is used to detect first pin on the seat to obtain first current. The changeover circuit converts first current value of first voltage value. The controlling circuit is controlled by the first control signal to drive the alarming signal so as to tell you whether the circuit is in open circuit or short circuit.
Description
Technical field
The present invention relates to a kind of open circuit/short circuit detector and detection method thereof, whether circuit has the pick-up unit and the detection method thereof of open circuit/short circuit situation between particularly a kind of pin runners that is applicable to detecting computer chip and central processing unit or internal memory.
Background technology
Progress along with the science and technology epoch, computing machine is used in different field widely, it requires can realize between chipset on the motherboard and central processing unit (CPU) that the normal transmission signal could normal operation, therefore when the circuit between chipset and central processing unit has open circuit (promptly disconnecting) or short circuit condition to take place, will cause computer system to start shooting, and then the consequence that computer system can not be operated.
See also Fig. 1 (a) and 1 (b), chipset 10 on the early stage motherboard on 14 is to be connected by circuit with 11 of the connecting seats of central processing unit, therefore when whether 11 of connecting seats desiring detection chip group 10 and central processing unit have open circuit or short circuit condition to take place, it all is the diode (flow through this chipset 10 and cause damage) [shown in Fig. 1 (b)] at pin (pin) two ends that utilize chipset 10 in order to prevent moment excessive electrostatic potential, and cooperate avometer to measure the whether conducting of circuit 12 of 11 of the connecting seats of 14 ground wires of diode and chipset 10 and central processing unit, judge 11 of the connecting seats of chipset 10 and central processing unit where branch connecting pins have and open a way or the situation of short circuit.
See also Fig. 1 (c),, and all terminal resistances are connected in parallel because 15 designs of existing motherboard all are connected to a terminal resistance R (in order to will provide logic of central processing unit signal pin accurate position) with the pin of the connecting seat 11 of central processing unit.When whether 11 of connecting seats desiring detection chip group 10 and central processing unit have open circuit or short circuit condition to take place, because all terminal resistances are connected in parallel, can cause the current value of pin to circulate mutually, even if therefore 11 of the connecting seats of chipset 10 and central processing unit have open circuit or short circuit condition to take place also can't judge, so the mode that can't use the described avometer of Fig. 1 (a) to measure can only utilize the real output signal of the every branch connecting pin of oscilloscope measurement to judge whether open circuit or situation of short circuit by the slip-stick artist.
Use this kind mode to measure whether to have open circuit or situation of short circuit has following shortcoming:
(1) loses time and manpower
Because therefore nearly three, 400 of the pins of central processing unit will be measured all to finish and need expend long time and waste of manpower.
(2) degree of difficulty height
Because the correct output signal of every branch connecting pin is all inequality,, could judge whether correctly that open circuit or situation of short circuit take place so the slip-stick artist that will measure must understand the state of every branch connecting pin.
Summary of the invention:
Fundamental purpose of the present invention be to provide a kind of can be simple and easy and fast detecting chip and pin runners between whether the open circuit/short circuit detector and the detection method thereof of the situation of open circuit/short circuit are arranged.
The present invention realizes like this, the invention provides a circuit board, comprise a pin runners on the said circuit board, and said pin runners can be electrically connected with a chip and a plurality of terminal resistance is connected, said circuit comprises: a power supply, the one end is connected in said chip, and the other end is electrically connected on a ground wire; One detector is electrically connected on first pin of said pin runners, in order to detecting first pin of said pin runners, and obtains one first current value; One change-over circuit is electrically connected on said detector, in order to convert said first current value to one first magnitude of voltage; One control circuit is electrically connected on said change-over circuit, in order to produce one first control signal according to said first magnitude of voltage; An and attention device, be electrically connected on said control circuit, driven by said first control signal, in order to export an alerting, to reach whether the circuit of judging between said pin runners first pin and said chipset first pin is the purpose of open circuit/short circuit because of the control of said first control signal.
Said circuit board can be a computer main frame panel in the above-mentioned open circuit/short circuit detector of the present invention.
Said pin runners can be the pin runners of a central processing unit in the above-mentioned open circuit/short circuit detector of the present invention.
Said pin runners is connected with a plurality of terminal resistances in the above-mentioned open circuit/short circuit detector of the present invention, in order to provide logic of central processing unit signal pin accurate position.
Said pin runners can be the pin runners of an internal memory in the above-mentioned open circuit/short circuit detector of the present invention.
Said a plurality of terminal resistances connect in the above-mentioned open circuit/short circuit detector of the present invention, in order to provide logic of internal memory signal pin accurate position.
Said power supply can be a dry cell in the above-mentioned open circuit/short circuit detector of the present invention, and its positive pole is connected in the ground wire of said chip, and negative electricity is connected in the common ground line of said change-over circuit and said control circuit.
The ground wire of said chip can be the ground wire of said circuit board in the above-mentioned open circuit/short circuit detector of the present invention.
Said detector can be a metal probe in the above-mentioned open circuit/short circuit detector of the present invention.
Said change-over circuit can be a current-voltage conversion circuit in the above-mentioned open circuit/short circuit detector of the present invention.
Said attention device can be a LCD (LCD) in the above-mentioned open circuit/short circuit detector of the present invention.
Said attention device can be a seven-segment display in the above-mentioned open circuit/short circuit detector of the present invention.
Said attention device can be a hummer in the above-mentioned open circuit/short circuit detector of the present invention.
Said attention device can be a light emitting diode (LED) in the above-mentioned open circuit/short circuit detector of the present invention.
Said pin runners can be connected with the pin of said chip in the above-mentioned open circuit/short circuit detector of the present invention, and each tool one diode of the pin two ends of said chip is flowed through said chip and caused damage in order to prevent moment excessive electrostatic potential.
A kind of open circuit/short circuit detector of the present invention, also can realize by following proposal, one circuit board, comprise a pin runners on the circuit board, said pin runners is electrically connected with a chip and a plurality of terminal resistance is connected, said circuit comprises: a power supply, and the one end is connected in said chip, and the other end is electrically connected on a ground wire; One detector is electrically connected on first pin of said pin runners, in order to detecting first pin of said pin runners, and obtains one first current value; One change-over circuit is electrically connected on said detector, in order to convert said first current value to one first magnitude of voltage; Whether one output circuit is electrically connected on said change-over circuit, in order to according to said first magnitude of voltage and then produce an output signal, be open circuit/short circuit with circuit between first pin of first pin of judging said pin runners and said chipset.
Said pin runners can be the pin runners of a central processing unit in the above-mentioned open circuit/short circuit detector of the present invention.
Said pin runners can be the pin runners of an internal memory in the above-mentioned open circuit/short circuit detector of the present invention.
Said power supply can be a dry cell in the above-mentioned open circuit/short circuit detector of the present invention, and its positive pole is connected in the ground wire of said chip, and negative electricity is connected in the common ground line of said change-over circuit and said control circuit.
The ground wire of said chip can be the ground wire of this circuit board in the above-mentioned open circuit/short circuit detector of the present invention.
Said detector can be a metal probe in the above-mentioned open circuit/short circuit detector of the present invention.
Said change-over circuit can be a current-voltage conversion circuit in the above-mentioned open circuit/short circuit detector of the present invention.
Said output circuit can comprise in the above-mentioned open circuit/short circuit detector of the present invention: a control circuit is electrically connected on said change-over circuit, in order to produce one first control signal according to said first magnitude of voltage; An and attention device, be electrically connected on said control circuit, driven by said first control signal, in order to exporting an alerting, whether be the purpose of open circuit/short circuit with circuit between first pin that reaches first pin of judging said pin runners and said chipset in response to the control of said first control signal.
Said attention device can be a LCD (LCD) in the above-mentioned open circuit/short circuit detector of the present invention.
Said attention device can be a seven-segment display in the above-mentioned open circuit/short circuit detector of the present invention.
Said attention device can be a hummer in the above-mentioned open circuit/short circuit detector of the present invention.
Said attention device can be a light emitting diode (LED) in the above-mentioned open circuit/short circuit detector of the present invention.
Said pin runners is connected with the pin of said chip in the above-mentioned open circuit/short circuit detector of the present invention, and each tool one diode of the pin two ends of said chip is flowed through chip and caused damage in order to prevent moment excessive electrostatic potential.
Another object of the present invention is for providing a kind of open circuit/short circuit detection method, realize in the following manner, the invention provides a circuit board, said circuit board comprises a pin runners, and said pin runners is electrically connected with a chip and a plurality of terminal resistance is connected, and the steps include: to provide a power supply to be electrically connected on a said chip and a ground wire; Detect first pin of said pin runners, and obtain one first current value; Convert this first current value to one first magnitude of voltage; Produce one first control signal according to said first magnitude of voltage; And export an alerting in response to the control of said first control signal; Whether with circuit between first pin that reaches first pin of judging said pin runners and said chipset is the purpose of open circuit/short circuit.
Said circuit board can be a motherboard in the above-mentioned open circuit/short circuit detection method of the present invention.
Said pin runners can be the pin runners of a central processing unit in the above-mentioned open circuit/short circuit detection method of the present invention.
Said pin runners can be the pin runners of an internal memory in the above-mentioned open circuit/short circuit detection method of the present invention.
Said power supply can be a dry cell in the above-mentioned open circuit/short circuit detection method of the present invention.
In the above-mentioned open circuit/short circuit detection method of the present invention said first current value by a detector contact with first pin of said pin runners obtain.
Said first magnitude of voltage can be by a change-over circuit according to said first current value conversion gained in the above-mentioned open circuit/short circuit detection method of the present invention.
Said first control signal can be produced by a control circuit in the above-mentioned open circuit/short circuit detection method of the present invention.
Said alerting is produced by an attention device in the above-mentioned open circuit/short circuit detection method of the present invention.
Another purpose of the present invention is for providing a kind of open circuit/short circuit detection method, can also realize in the following manner, adopt a motherboard, comprise a pin runners on the said motherboard, and said pin runners is electrically connected with a chip, said internal memory is connected with a plurality of terminal resistances, the steps include: to provide a power supply to be electrically connected on a said chip and a ground wire; Detect first pin of said pin runners, and obtain one first current value; Convert said first current value to one first magnitude of voltage; According to said first magnitude of voltage and then produce an output signal, whether be the purpose of open circuit/short circuit with circuit between first pin that reaches first pin of judging said pin runners and said chipset.
The drawing explanation
Fig. 1 (a) is (c) (b): be the prior art constructions synoptic diagram.
Fig. 2 (a) is the electrical block diagram of the open circuit/short circuit detector of embodiments of the invention 1.
Fig. 2 (b) is the electrical block diagram of the open circuit/short circuit detector of embodiments of the invention 2.
Fig. 3 is the circuit diagram of open circuit/short circuit detector of the present invention.
Fig. 4 is the flow chart of steps of open circuit/short circuit detection method of the present invention.
The figure number explanation
10-chipset 11-connecting seat
The pin of the circuit 13-chipset of 12-chipset and connecting seat
14-diode 15-motherboard
20-motherboard 201-chip
2011-chip pin 2012-diode
First pin of 202-pin runners 2021-pin runners
203-terminal resistance 21-open circuit/short circuit detector
211-power supply 212-detector
213-current-voltage conversion circuit 214-output circuit
215-control circuit 216-attention device
2131-operational amplifier 2132-variable resistor
22-arranges pin
Embodiment
Consulting Fig. 2 (a) reaches (b), it is the electrical block diagram of the open circuit/short circuit detector of the embodiment of the invention 1 and embodiment 2, this open circuit/short circuit detector 21 mainly is applicable to a motherboard 20, comprise a pin runners 202 that is connected with central processing unit or internal memory on the motherboard 20, and pin runners 202 can be electrically connected with a chip 201 and a plurality of terminal resistance 203 is connected, and this circuit can comprise: a power supply 211, a detector 212, a current-voltage conversion circuit 213 and an output circuit 214.This power supply 211 can be a dry cell, its positive pole is connected in the ground wire (being the ground wire of motherboard) of chip 201 and contacts with the diode 2012 (in order to provide logic of central processing unit signal pin accurate position) of pin 2011 belows of chip 201, and negative pole then is electrically connected on the common ground line of current-voltage conversion circuit 213 and output circuit 214.
Detector 212 can be a metal probe, by row's pin 22 that contact is come out by 2021 backguys of first pin of this pin runners, detects first pin 2021 of this pin runners, and obtains one first current value I in.
This current-voltage conversion circuit 213 is electrically connected on this detector 212, can be in order to convert this first current value I in to one first magnitude of voltage V.This output circuit 214 can comprise a control circuit 215 and an attention device 216.This control circuit 215 is electrically connected on this current-voltage conversion circuit 213, in order to receive this first magnitude of voltage and to produce one first control signal according to the size of this first magnitude of voltage.
Attention device 216 is electrically connected on this control circuit 215, driven by this first control signal, in order to exporting an alerting, whether be the purpose of open circuit/short circuit with circuit between first pin that reaches first pin of judging this pin runners and this chipset in response to the control of first control signal.In like manner, adopt said apparatus that other pin of this pin runners is detected.
Consult Fig. 2 (a), when originally just having a plurality of terminal resistances 203 (in order to the accurate position of logic of signal pin that this central processing unit or internal memory are provided) that are connected with pin runners 202 on the motherboard 20, the present invention can directly utilize this a plurality of terminal resistances 203, when on this motherboard 20 not pin runners 202 connect a plurality of terminal resistance 203 time, then need to connect a terminal resistance 203 voluntarily in the signal pin of this pin runners, and all resistance is connected in parallel, make open circuit/short circuit detector of the present invention advance to detect.By the above embodiments as can be known, open circuit/short circuit detector of the present invention can be applicable to the tool terminal resistance simultaneously and not have the motherboard of terminal resistance.
Attention device 216 one of can be in a LCD (LCD), seven-segment display, hummer or the light emitting diode (LED).
Consulting Fig. 3, is the detailed circuit diagram of open circuit/short circuit detector of the present invention.Wherein this current-voltage conversion circuit 213 can comprise an operational amplification circuit 2131 (Operational
Amplifier) and a variable resistor 2132.The magnitude of voltage that operational amplification circuit 2131 can be used to be obtained via first current value conversion back is amplified and then is obtained this first magnitude of voltage, makes this follow-up control circuit 215 can know identification, and produces different control signals.
See also Fig. 3 and Fig. 4, Fig. 4 is the flow chart of steps of open circuit/short circuit detection method.It is attention device that present embodiment adopts light emitting diode (LED), and wherein a pin that the representative of bright green light emitting diode detects is a normal condition.The pin that the representative of shiny red light emitting diode detects is short circuit, represents this pin runners to have pin short circuit more than 2 at least.The pin that detects when both all not luminous representatives is open circuit, has the situation of the empty weldering of broken string or chip.The main step of this open circuit/short circuit detection method can comprise: at first, the positive pole of 1.5 volts dry cells is connected with the ground wire of chip, negative pole is connected with the common ground line of this current-voltage conversion circuit and this control circuit.Secondly, the pin of metal probe with a normal condition contacted, and adjustment is arranged at this current-voltage and passs on the variable resistor that changes circuit, (LED) lights up to green LED, promptly finishes corrective action.Then, row's pin that the contact of this metal probe is come out by first pin institute backguy of this pin runners, and detecting obtains one first current value.Then, convert this first current value to one first magnitude of voltage by a current-voltage conversion circuit.Then, this first magnitude of voltage is sent to a control circuit, makes this control circuit produce one first control signal in response to this first magnitude of voltage.At last, drive this light emitting diode, allow the user judge that according to the situation of lumination of light emitting diode circuit is open circuit/short circuit or normal condition between first pin of first pin of this pin runners and this chip by this first control signal.In like manner, adopt said method that other pin of this pin runners is detected.
See also following table, for the power supply of this open circuit/short circuit detector is 1.5 volts and connects central processing unit or the terminal resistance of the signal pin of internal memory is when being 56 ohm, the testing result that is obtained according to the current detected value.
| The current value (mA) of detecting gained | Magnitude of voltage after the conversion (V) | The light emitting diode that is driven | Testing result |
| ????20 | About 3V | All do not work | Open circuit |
| ????40 | About 4V | Green | Normally |
| ????60 | More than the 5V | Red | Short circuit |
When being attention device as for the employing hummer, it mainly is the control of the different control signals that produce in response to this control circuit, send different types of sound or same sound by hummer but be the tone of different frequency, whether the situation of open circuit/short circuit is arranged to reach the circuit of informing this pin runners of user and chip chamber.
Open circuit/short circuit detector of the present invention and detection method thereof, can effectively improve prior art need use oscillograph to check pin, both lost time and manpower and the very high shortcoming of degree of difficulty, the row's pin that uses device and method of the present invention only need use the probe contact to come out by this pin institute backguy, again according to the situation of lumination of light emitting diode, just can be simple and easy and fast detecting chip and pin runners between whether the open circuit/short circuit situation is arranged, and can be applicable to the tool terminal resistance simultaneously and not have on the motherboard of terminal resistance, so the present invention has industrial value.
Claims (40)
1, a kind of open circuit/short circuit detector is applicable to a circuit board, comprises a pin runners on the said circuit board, and said pin runners is electrically connected with a chip and a plurality of terminal resistance is connected, and it is characterized in that this circuit comprises:
One power supply, the one end is connected in said chip, and the other end is electrically connected on a ground wire;
One detector is electrically connected on first pin of said pin runners, in order to detecting first pin of said pin runners, and obtains one first current value;
One change-over circuit is electrically connected on said detector, in order to convert said first current value to one first magnitude of voltage;
One control circuit is electrically connected on said change-over circuit, in order to produce one first control signal according to said first magnitude of voltage; An and attention device, be electrically connected on said control circuit, driven by said first control signal, in order to exporting an alerting, whether be open circuit/short circuit with circuit between first pin of first pin of judging said pin runners and said chip in response to the control of said first control signal.
2, open circuit/short circuit detector according to claim 1 is characterized in that wherein said circuit board is a motherboard.
3, open circuit/short circuit detector according to claim 1 is characterized in that the pin runners that wherein said pin runners is a central processing unit.
4,, it is characterized in that a signal pin logic accurate position of wherein said a plurality of terminals in order to said central processing unit to be provided according to claim 1 or 3 described open circuit/short circuit detectors.
5, open circuit/short circuit detector according to claim 1 is characterized in that the pin runners that wherein said pin runners is an internal memory.
6, open circuit/short circuit detector according to claim 1 or 5 is characterized in that a signal pin logic accurate position of wherein said a plurality of terminal resistances in order to said internal memory to be provided.
7, open circuit/short circuit detector according to claim 1, it is characterized in that wherein said power supply is a dry cell, its positive pole is connected in the ground wire of said chip, and negative electricity is connected in the common ground line of said change-over circuit and said control circuit.
8, open circuit/short circuit detector according to claim 7 is characterized in that wherein the ground wire of said chip is the ground wire of said circuit board.
9, open circuit/short circuit detector according to claim 1 is characterized in that wherein said detector is a metal probe.
10, open circuit/short circuit detector according to claim 1 is characterized in that wherein said change-over circuit is a current-voltage conversion circuit.
11, open circuit/short circuit detector according to claim 10 is characterized in that wherein said current-voltage conversion circuit comprises a variable resistor, before first pin to said pin runners detects, carries out a corrective action.
12, open circuit/short circuit detector according to claim 1 is characterized in that wherein said attention device is a LCD.
13, open circuit/short circuit detector according to claim 1 is characterized in that wherein said attention device is a seven-segment display.
14, open circuit/short circuit detector according to claim 1 is characterized in that wherein said attention device is a hummer.
15, open circuit/short circuit detector according to claim 1 is characterized in that wherein said attention device is a light emitting diode.
16, open circuit/short circuit detector according to claim 1, it is characterized in that wherein said pin runners is connected with the pin of said chip, the pin two ends of said chip respectively have a diode, flow through chip and cause damage in order to prevent moment excessive electrostatic potential.
17, a kind of open circuit/short circuit detector is applicable to a circuit board, comprises a pin runners on the said circuit board, and said pin runners is electrically connected with a chip and a plurality of terminal resistance is connected, and it is characterized in that this circuit comprises:
One power supply, the one end is connected in said chip, and the other end is electrically connected on a ground wire;
One detector is electrically connected on first pin of said pin runners, in order to detecting first pin of this pin runners, and obtains one first current value;
One change-over circuit is electrically connected on said detector, in order to first current value is converted to one first magnitude of voltage;
Whether one output circuit is electrically connected on said change-over circuit, in order to according to first magnitude of voltage and then produce an output signal, be open circuit/short circuit with circuit between first pin of first pin of judging said pin runners and said chip.
18, open circuit/short circuit detector according to claim 17 is characterized in that the pin runners that wherein said pin runners is a central processing unit.
19, open circuit/short circuit detector according to claim 17 is characterized in that the pin runners that wherein said pin runners is an internal memory.
20, open circuit/short circuit detector according to claim 17, it is characterized in that wherein said power supply is a dry cell, its positive pole is connected in the ground wire of said chip, and negative electricity is connected in the common ground line of said change-over circuit and said control circuit.
21, open circuit/short circuit detector according to claim 20 is characterized in that wherein the ground wire of said chip is the ground wire of said circuit board.
22, open circuit/short circuit detector according to claim 17 is characterized in that wherein said detector is a metal probe.
23, open circuit/short circuit detector according to claim 17 is characterized in that wherein said change-over circuit is a current-voltage conversion circuit.
24, open circuit/short circuit detector according to claim 17 is characterized in that wherein said output circuit comprises:
One control circuit is electrically connected on said change-over circuit, in order to produce one first control signal according to said first magnitude of voltage; An and attention device, be electrically connected on said control circuit, whether driven by said first control signal, in order to exporting an alerting in response to the control of first control signal, be open circuit/short circuit with circuit between first pin of first pin of judging said pin runners and said chipset.
25, open circuit/short circuit detector according to claim 24 is characterized in that wherein said attention device is a LCD.
26, open circuit/short circuit detector according to claim 24 is characterized in that wherein said attention device is a seven-segment display.
27, open circuit/short circuit detector according to claim 24 is characterized in that wherein said attention device is a hummer.
28, open circuit/short circuit detector according to claim 24 is characterized in that wherein said attention device is a light emitting diode.
29, open circuit/short circuit detector according to claim 17, it is characterized in that wherein said pin runners is connected with the pin of said chip, each tool one diode of the pin two ends of said chip is flowed through this chip and is caused damage in order to prevent moment excessive electrostatic potential.
30, a kind of open circuit/short circuit detection method is applicable to a circuit board, comprises a pin runners on the circuit board, and said pin runners is electrically connected with a chip and a plurality of terminal resistance is connected, and the steps include:
Provide a power supply to be electrically connected on a said chip and a ground wire;
Detect first pin of said pin runners, and obtain one first current value;
Convert first current value to one first magnitude of voltage;
Produce one first control signal according to first magnitude of voltage; Whether and to export an alerting in response to the control of first control signal be open circuit/short circuit with circuit between first pin of first pin of judging said pin runners and said chip.
31, open circuit/short circuit detection method according to claim 30 is characterized in that first pin of wherein detecting said pin runners still comprises the following step before:
Adjust a variable resistor to carry out a corrective action.
32, open circuit/short circuit detection method according to claim 30 is characterized in that wherein said circuit board is a motherboard.
33, open circuit/short circuit detection method according to claim 30 is characterized in that the pin runners that wherein said pin runners is a central processing unit, and said pin runners is connected with a plurality of terminal resistances.
34, open circuit/short circuit detection method according to claim 30 is characterized in that the pin runners that wherein said pin runners is an internal memory, and said pin runners is connected with a plurality of terminal resistances.
35, open circuit/short circuit detection method according to claim 30 is characterized in that wherein said power supply is a dry cell.
36, open circuit/short circuit detection method according to claim 30, it is characterized in that wherein said first current value by a detector contact with first pin of said pin runners obtain.
37, open circuit/short circuit detection method according to claim 30, it is characterized in that wherein said first magnitude of voltage by a change-over circuit according to first current value conversion gained.
38, open circuit/short circuit detection method according to claim 30 is characterized in that wherein said first control signal is produced by a control circuit.
39, open circuit/short circuit detection method according to claim 30 is characterized in that wherein said alerting is produced by an attention device.
40, a kind of open circuit/short circuit detection method is applicable to a motherboard, comprises a pin runners on the motherboard, and said pin runners is electrically connected with a chip and a plurality of terminal resistance is connected, and the steps include:
Provide a power supply to be electrically connected on a said chip and a ground wire;
Detect first pin of said pin runners, and obtain one first current value;
Convert first current value to one first magnitude of voltage;
According to first magnitude of voltage and then produce an output signal, whether be open circuit/short circuit with circuit between first pin of first pin of judging said pin runners and said chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011453656A CN100335910C (en) | 2001-12-31 | 2001-12-31 | Open circuit/short circuit detector and its detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011453656A CN100335910C (en) | 2001-12-31 | 2001-12-31 | Open circuit/short circuit detector and its detection method |
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| Publication Number | Publication Date |
|---|---|
| CN1366186A true CN1366186A (en) | 2002-08-28 |
| CN100335910C CN100335910C (en) | 2007-09-05 |
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| CNB011453656A Expired - Fee Related CN100335910C (en) | 2001-12-31 | 2001-12-31 | Open circuit/short circuit detector and its detection method |
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| CN2105731U (en) * | 1991-05-14 | 1992-05-27 | 任永滨 | Multi-function alarm |
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