CN103576058A - Insulation detection device and insulation detection method of PCB - Google Patents
Insulation detection device and insulation detection method of PCB Download PDFInfo
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- CN103576058A CN103576058A CN201310321437.0A CN201310321437A CN103576058A CN 103576058 A CN103576058 A CN 103576058A CN 201310321437 A CN201310321437 A CN 201310321437A CN 103576058 A CN103576058 A CN 103576058A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
- G01R31/2808—Holding, conveying or contacting devices, e.g. test adapters, edge connectors, extender boards
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/12—Measuring rate of change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0266—Marks, test patterns or identification means
- H05K1/0268—Marks, test patterns or identification means for electrical inspection or testing
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
An insulation detection device of a PCB. A DC voltage is applied among circuit patterns (C1-C4) of the PCB (1), the conditions of insulation states among the patterns of the PCB are determined based on insulation resistance values calculated by the applied voltage value and values of currents flowing among the circuit patterns. The insulation detection device comprises: a current detection unit (7) for detecting the current flowing among the circuit patterns through application of the voltage; a current increase detection unit (9) for detecting whether a current value detected by the current detection unit (7) resulting from discharge occurring among the circuit patterns has increased by more than a specified value during the period of discharge detection time which starts from the voltage application to the time starting from completion of voltage rise until set time has passed; a discharge determining unit (25) for determining that the PCB is a unqualified product in the case that current increase is detected by the current increase detection unit; and discharge detection time setting unit (10) capable of changing the set time.
Description
Technical field
The present invention relates to check device and the insulation inspecting method thereof of the state of insulation between the circuit pattern of printed-wiring board (PWB).
Background technology
In the situation that the state of insulation between the circuit pattern of inspection printed-wiring board (PWB), between the circuit pattern of printed-wiring board (PWB), by inspection probe, apply inspection voltage, from this inspection voltage, ask insulating resistance value with checking the current value flowing through probe, based on this insulating resistance value, check that whether state of insulation is good.In this case, sometimes because voltage applies between circuit pattern, discharge (spark), in the situation that having there is this electric discharge, this wiring board is judged as unacceptable product.
In patent documentation 1, disclose circuit pattern has been applied to voltage, detection applies the voltage starting between circuit pattern during till the timing (timing) of regulation from voltage, detection, in the voltage drop having or not during this period between the circuit pattern occurring because of electric discharge, is judged to be unacceptable product by wiring board if voltage drop detected.
More particularly, in Fig. 2 of patent documentation 1, shown following methods: the elapsed time being applied to from trial voltage the moment between circuit pattern is carried out to timing, at the voltage of circuit pattern, become the moment calculating insulating resistance value of the regulation of steady state (SS), and detect, till this moment, whether electric discharge has occurred between circuit pattern, in the situation that being judged to be not generation electric discharge, the resistance value going out by comparative measurements and the size of threshold value, carry out the quality of the state of insulation between circuit pattern and judge.In addition, in Fig. 3 of patent documentation 1, shown following methods: first judge whether electric discharge has occurred after voltage applies, when there is electric discharge, being judged to be this wiring board is unacceptable product, on the other hand, in the situation that not there is not electric discharge, after the stipulated time, measure magnitude of voltage and electric current and carry out calculated resistance value, and according to this resistance value, carry out quality and judge.
[prior art document]
[patent documentation]
No. 3546046 communique of [patent documentation 1] Jap.P.
Summary of the invention
The problem that invention will solve
But, setting for detection of the timing difficulty that has discharge off to occur, also to calculate insulating resistance value, and detect in the former method have that discharge off occurs, sometimes after becoming steady state (SS), voltage also discharges, so there is the problem that can not carry out unacceptable product judgement there is electric discharge in the situation that calculating after insulating resistance value.Even in first detecting the latter's who calculates again insulating resistance value after having discharge off to occur method, produce during till calculating to insulating resistance value from judging of having that discharge off occurs
blank time, have the defect can't detect in the electric discharge occurring during this period.
The present invention completes in view of such situation, and object is to detect reliably electric discharge and occurs, thereby improves the precision of the insulation inspection of printed-wiring board (PWB).
The scheme of dealing with problems
The insulation inspecting device of printed-wiring board (PWB) of the present invention, between the circuit pattern of printed-wiring board (PWB), apply DC voltage, the insulating resistance value that the current value flowing through between the magnitude of voltage based on applying and described circuit pattern is calculated is judged the quality of the state of insulation between described circuit pattern, it is characterized in that, comprise: apply voltage control unit, its control applies voltage; Electric current increases detecting unit, its the current detecting zero hour from voltage applies beginning to using voltage while having risen as starting point through the discharge examination till the moment of stipulated time in the time, detect and result from the electric discharge that occurs between described circuit pattern and more than whether having increased at the current value flowing through between described circuit pattern the threshold value of stipulating; Electric discharge identifying unit, it increases that to be judged to be described printed-wiring board (PWB) be unacceptable product in the situation that increase more than the threshold value that detecting unit detects described regulation electric current by described electric current; And discharge examination time setting unit, it can set the described stipulated time.
In addition, the insulation inspecting method of printed-wiring board (PWB) of the present invention, it applies DC voltage between the circuit pattern of printed-wiring board (PWB), the insulating resistance value that the current value flowing through between the magnitude of voltage based on applying and described circuit pattern is calculated is judged the quality of the state of insulation between described circuit pattern, it is characterized in that, comprise: preset current detecting zero hour from voltage applies beginning and as starting point, pass through the discharge examination time till the moment of stipulated time to usining voltage while having risen, in described discharge examination in the time, detect the current value flowing through between described circuit pattern and increased in the above situation of threshold value of regulation and be judged to be the step that described printed-wiring board (PWB) is unacceptable product.
By the end time of discharge examination time being located at when voltage has risen after the stipulated time, not only when voltage rises, but also the electric discharge that can detect reliably when voltage stabilization thereafter occurs.And, the stipulated time can setting when voltage has risen for this discharge examination time, thus according to the manufacture of printed-wiring board (PWB), carry out in batches time setting, thus can suitably detect electric discharge generation.
In the insulation inspecting device of printed-wiring board (PWB) of the present invention, the described voltage control unit that applies can be also for asking the insulation resistance of described insulating resistance value to detect voltage or being greater than one of them voltage that described insulation resistance detects the discharge examination voltage of voltage by the described Control of Voltage that applies, the fine or not state of insulation identifying unit of judging described state of insulation also can be according to detecting through after-applied described insulation resistance of described discharge examination time the quality that voltage calculates the described insulating resistance value between described circuit pattern and judges state of insulation, described electric current increase detecting unit also can detect the electric current being caused by the described discharge examination unit applying in the time in described discharge examination to be increased.
In insulation inspecting method of the present invention, also can by the described Control of Voltage that applies for for asking the insulation resistance of described insulating resistance value to detect voltage or being greater than one of them voltage that described insulation resistance detects the discharge examination voltage of voltage, and increased that more than the threshold value of described regulation to be judged to be described printed-wiring board (PWB) be unacceptable product in the situation that described discharge examination detects current value that described discharge examination voltage causes in the time.
According to present embodiment, by separately controlling by the voltage for discharge examination with for the voltage of insulation resistance calculating, can set best voltage according to inspection separately, in addition, by discharge examination voltage is set as to high voltage, can detect reliably electric discharge and occur.
In the insulation inspecting device of printed-wiring board (PWB) of the present invention, described in apply voltage control unit and also can also comprise: voltage rising time setup unit, it is set from voltage and applies the time till starting when described voltage has risen.
According to this embodiment, there is moment and add that while applying voltage, electric discharge occurs and the situation of detection difficult instantaneously, but in such situation, also can be by changing voltage rising time, detect reliably the generation of electric discharge, can correctly carry out the judgement of the unacceptable product of wiring board.
In the insulation inspecting device of printed-wiring board (PWB) of the present invention, the electric current that described electric current increases more than the threshold value that detecting unit also can also detect described regulation increases the required time, described electric discharge identifying unit also can, in the situation that the electric current being increased more than the threshold value that detecting unit detects described regulation by described electric current increases, increase the required time when predetermined electric current increases in the scope of judgement time, to be judged to be printed-wiring board (PWB) be unacceptable product detecting described electric current.
In insulation inspecting method of the present invention, also can be in the situation that more than detecting the current value that flows through between described circuit pattern and having increased the threshold value of regulation, also detect this current value increase the threshold value of described regulation above till the required time, detecting this time, when predetermined electric current increases in the scope of judgement time, to be judged to be printed-wiring board (PWB) be unacceptable product.
In this case, described electric discharge identifying unit also can also have the electric current increase time setting unit that can change the described electric current increase judgement time.
In insulation inspecting method of the present invention, also can preset from voltage and apply the time till starting when described voltage has risen.
In the present embodiment, except detecting electric current increase, by to be judged to be printed-wiring board (PWB) when electric current increases in scope at the appointed time of required time be not certified products detecting, can prevent the misinterpretation that noise causes, can correctly carry out the judgement of the unacceptable product of wiring board.
In addition, in the insulation inspecting method of printed-wiring board (PWB) of the present invention, also can be from the detection of the electric current that starts to start after the stipulated time voltage applies to flow through between described circuit pattern.
That is,, due to the unsure state and then starting to represent after voltage applies electric signal, so in the present embodiment, in order to prevent misinterpretation, avoid starting current detecting after this time.
The effect of invention
According to the present invention, not only can be when voltage rise, but also can detect reliably the electric discharge occurring when voltage stabilization thereafter, and according to the manufacture of printed-wiring board (PWB), set in batches etc. its discharge examination time, can detect reliably electric discharge and occur, improve accuracy of detection.
Accompanying drawing explanation
Fig. 1 means the block scheme of insulation inspecting device of the printed-wiring board (PWB) of the 1st embodiment of the present invention.
Fig. 2 (a)～(b) mean in embodiments of the present invention, the electric characteristic figure that the time between the electric current flowing through between the voltage in the situation that of there is electric discharge in executing alive rising and circuit pattern changes.
Fig. 3 (a)～(b) mean in embodiments of the present invention, the electric characteristic figure that the time between the electric current flowing through between the voltage in the situation that of there is electric discharge after executing alive rising and completing and circuit pattern changes.
Fig. 4 means the process flow diagram of insulation inspecting method of the printed-wiring board (PWB) of the 1st embodiment of the present invention.
Fig. 5 means the block scheme of insulation inspecting device of the printed-wiring board (PWB) of the 2nd embodiment of the present invention.
Fig. 6 means the process flow diagram of insulation inspecting method of the printed-wiring board (PWB) of the 2nd embodiment of the present invention.
Fig. 7 means the block scheme of insulation inspecting device of the printed-wiring board (PWB) of the 3rd embodiment of the present invention.
Fig. 8 means the process flow diagram of insulation inspecting method of the printed-wiring board (PWB) of the 3rd embodiment of the present invention.
Fig. 9 means the process flow diagram of insulation inspecting method of the printed-wiring board (PWB) of the 4th embodiment of the present invention.
Label declaration
1... printed-wiring board (PWB), 2... on-off circuit, 3... Switch Control unit, 4... variable voltage source, 5... apply voltage control unit, 6... voltage detection unit, 7... current detecting unit, 8... the voltage detecting unit that risen, 9... electric current increases detecting unit, 10... discharge examination time setting unit, 11... control device, 12... display device, 13... voltmeter, 14... galvanometer, 21...CPU, 22... storer, 23... data communication units, 24... discharge examination time setting unit, 25... identifying unit discharges, 26... state of insulation identifying unit, 31... voltage rising time setup unit, 32... electric current increases judgement time setting unit, the main change-over switch of A0...+ side, A1～A4...+ side change-over switch, the main change-over switch of B0...-side, B1～B4...-side change-over switch, C1～C4... circuit pattern
Embodiment
Below, with reference to the accompanying drawings of embodiments of the present invention.
With reference to Fig. 1, the insulation inspecting device of the printed-wiring board (PWB) in the 1st embodiment is to the inspection of insulating of the combination between a plurality of circuit pattern C1～C4 on printed-wiring board (PWB) 1.This insulation inspecting device has: on-off circuit 2, has a plurality of change-over switch A0～A4, the B0～B4 that are connected to each circuit pattern C1～C4; Switch Control unit 3, controls each change-over switch A0～A4 of this on-off circuit 2, the break-make of B0～B4; Variable voltage source 4, by on-off circuit, 2 couples of circuit pattern C1～C4 apply voltage; Apply voltage control unit 5; Voltage detection unit 6 and current detecting unit 7, detect by on-off circuit 2 and become voltage and electric current between the circuit pattern of the connection status that is connected to variable voltage source 4; The voltage detecting unit 8 that risen detects voltage and has risen after voltage applies; Electric current increases detecting unit 9, more than whether detection current value increases the threshold value of regulation; Discharge examination time setting unit 10, sets the discharge examination time as described later; Main control unit 11 and display device 12.
On-off circuit 2 have be connected to variable voltage source 4+side+the main change-over switch A0 of side and be connected to-side-the main change-over switch B0 of side.The main change-over switch A0 of+side is upper, be connected to each circuit pattern C1～C4+side change-over switch A1～A4 is connected in parallel.On-main change-over switch the B0 of side, be connected to each circuit pattern C1～C4-side change-over switch B1～B4 is connected in parallel.
And by Switch Control unit 3, in the situation of four circuit pattern C1～C4 shown in Fig. 1, as shown in table 1, the break-make of each change-over switch A0～A4, B0～B4 (ON/OFF (ON/OFF)) is controlled.On table 1 hollow hurdle, represent the state turn-offing.
Table 1
| ? | A1 | B1 | A2 | B2 | A3 | B3 | A4 | B4 |
| Check the 1st time | Conducting | ? | Conducting | ? | ? | Conducting | ? | Conducting |
| Check the 2nd time | Conducting | ? | ? | Conducting | ? | ? | ? | ? |
| Check the 3rd time | ? | ? | ? | ? | Conducting | ? | ? | Conducting |
As shown in table 1, first, in checking the 1st time, by circuit pattern C1 and circuit pattern C2 separately+side change-over switch A1, A2 be made as connection status (conducting), and by circuit pattern C3 and circuit pattern C4-side change-over switch B3, B4 be made as connection status (conducting).Now, main change-over switch A0, B0 are made as open-circuit condition (shutoff).And, by the order with from-main change-over switch the B0 of side to+side change-over switch A0, be made as connection status (conducting), to each circuit pattern, C1～C4 applies voltage.At this, check in the 1st time the state of insulation respectively between check circuit pattern C1 and circuit pattern C3, between circuit pattern C1 and circuit pattern C4, between circuit pattern C2 and circuit pattern C3, between circuit pattern C2 and circuit pattern C4.
Then, in checking the 2nd time, by circuit pattern C1+side change-over switch A1 is set as connection status (conducting), and circuit pattern C2-side change-over switch B2 is set as connection status (conducting), if two main change-over switch A0, B0 are sequentially set as to connection status (conducting) from-side, the state of insulation between check circuit pattern C1 and circuit pattern C2.
In checking the 3rd time, by circuit pattern C3+side change-over switch A3 is set as connection status (conducting), and circuit pattern C4-side change-over switch B4 is set as connection status (conducting), if similarly two main change-over switch A0, B0 are sequentially set as to connection status (conducting) from-side, the state of insulation between check circuit pattern C3 and circuit pattern C4.
By the operation of above each change-over switch, check the state of insulation of whole combinations of four circuit pattern C1～C4.
Apply voltage control unit 5 and control the voltage that applies of variable voltage source 4 generations, so comprise that can change this by operator executes alive function.
Voltage risen detecting unit 8 with specified period sampling the voltage signal from voltage detection unit 6 outputs, in the situation that the voltage signal of this sampling has reached the assigned voltage of setting by applying voltage control unit 5, detect and execute alive rising and complete, and export rising settling signal.
Electric current increase detecting unit 9 with specified period sampling the current signal from current detecting unit 7 outputs, relatively last time current signal and this current signal, in the situation that current value increased the threshold value of regulation more than output current increase signal.
In main control unit 11, be provided with for and CPU21, storer 22, each unit between the data communication units 23 etc. of data communication, possess the function of judging the state of insulation identifying unit 26 of state of insulation in the discharge examination of being set by discharge examination time setting unit 10 determines whether in the time that the electric discharge identifying unit 25 of electric discharge, the insulation inspection carried out after discharge examination have occurred.
Discharge examination time setting unit 10 is set from voltage and has been risen the stipulated time of detecting unit 8 after when voltage being detected and having risen, and has and can be changed by operator the function of stipulated time.The discharge examination time is from starting after the stipulated time voltage applies beginning, until when voltage has risen to the time finishing after the stipulated time, at the electric current being increased by electric current during this period more than the threshold value that detecting unit 9 detects regulation, increasing.
By Fig. 2 and Fig. 3, illustrate that this discharge examination is during the time, the electric discharge between circuit pattern has situation about occurring in executing alive rising as shown in Figure 2, and situation about occurring after executing alive rising and completing as shown in Figure 3.
In Fig. 2 and Fig. 3, constantly t0 is that voltage applies the start time, beginning current detecting the moment t1 of the regulation from this moment t0 the elapsed time.From this moment t0 till during the time of moment t1 is the and then electric signal of voltage applying unsettled, so that prevent misinterpretation, Cai sensed current after waiting for this elapsed time.And voltage discharges in rising in Fig. 2, thereby increase producing current value moment voltage drop while.
In Fig. 2 and Fig. 3, when t2 represents that voltage has risen constantly.In Fig. 3, after this moment t2, discharge, produce the increase of the moment of voltage drop and current value.In addition, when constantly t3 represents that electric current increases the end detecting, the moment t2 when voltage of usining has risen as starting point till the time of moment t3 be the afore mentioned rules time.And, from moment t1 till moment t3 during be to detect the time that electric current increases, be the discharge examination time.Above-mentioned discharge examination time setting unit 10 is set the stipulated time of having risen till moment t3 from voltage, this is t3 locked (lock) constantly, to can set after the moment t2 only when voltage has risen, can not set t2 constantly and reach the front moment.
Have again, as shown in Figures 2 and 3, above-mentioned electric current increases detecting unit 9 relatively with the current signal I1 and this current signal I2 last time of specified period sampling, in the situation that their poor (I2-I1) increased the threshold value of regulation more than output current increase signal.
Electric discharge identifying unit 25 is judged to be electric discharge in discharge examination in the time and occurs in the situation that electric current increase detecting unit 9 has been exported electric current increase signal.
State of insulation identifying unit 26 calculates insulating resistance value according to the detection signal from voltage detection unit 6 and current detecting unit 7, in the situation that this insulating resistance value is to be judged to be defective insulation below predetermined judgement resistance value.
Below, according to the flowchart text of Fig. 4, by the insulation inspecting device forming like that above, carry out the 1st embodiment of the method that the insulation of printed-wiring board (PWB) 1 checks.
First, by applying voltage control unit 5, set the voltage that will apply, and set the discharge examination time (be actually from voltage and risen moment t2 till the stipulated time of moment t3) (step S1) by discharge examination time setting unit 10.
Then, according to table 1, by one among+side change-over switch A1～A4 above conducting (step S2), by an above conducting (step S3) among-side change-over switch B1～B4.
Then, in-main change-over switch B0 the conducting of side after (step S4), the main change-over switch A0 conducting of general+side (step S5).Then, from waiting for process stipulated time (t1-t0) (step S6), by current detecting unit 7, start current detecting (step S7).
From the current signal of current detecting unit 7 outputs, with specified period, be sampled, at electric current, increase comparison current signal last time and this current signal in detecting unit 9, its result, determines whether and detects the threshold value above (step S8) that current value has increased regulation.In the situation that can not be judged to be more than the threshold value that detects regulation electric current in step S8, increase (situation of "No"), determine whether when voltage has risen through stipulated time (whether having passed through the discharge examination time) (step S9).When this voltage has risen, whether passed through the stipulated time, according to exporting after rising settling signal in the detecting unit 8 that risen at voltage, whether passed through the stipulated time of being set by discharge examination time setting unit 10 and judged.And, can not judge passed through the stipulated time in the situation that situation of "No" (in the step S9 as), turn back to step S8, until all continued whether to increase the detection of the above electric current of threshold value of regulation through the stipulated time.In step S8, according to the electric current that increases detecting unit 9 from electric current, increase signal, in the situation that the electric current being judged to be more than the threshold value that detects regulation increases (situation of "Yes"), as the situation that detects electric discharge generation, being judged to be this printed-wiring board (PWB) is unacceptable product (step S10).
If being judged to be when voltage has risen in step S9 through stipulated time (situation of "Yes"), by voltage detection unit 6 and current detecting unit 7, the current i (step S11) that detects voltage V and flow through between circuit pattern.And, according to these voltage V and current i, by the resistance value R (step S12) between state of insulation identifying unit 26 counting circuit patterns, the resistance value R calculating and predefined judgement resistance value Rj are compared, judge whether the resistance value R calculating is judging more than resistance value Rj (step S13).In the situation that can not being judged to be the resistance value R calculating and judging that resistance value Rj is above the situation of "No" (in the step S13 as), the storage (step S14) using the combination of this circuit pattern as defective insulation position, and whole change-over switch A0～A4, B0～B4 is turn-offed to (step S15).In step S13, be judged to be resistance value R in the situation that judging that resistance value Rj is above (situation of "Yes"), because the state of insulation between this circuit pattern is good, so proceed to step S15.
In step S15, whole change-over switch A0～A4, B0～B4 is closed and had no progeny, whether judgement finishes (step S16) to the inspection of the combination of whole circuit patterns, in the situation that can not being judged to be end (situation of "No"), proceed to step S2, according to table 1, for the combination of next circuit pattern, implement and so far same inspection.
In the situation that be judged to be in step S16, the inspection of the combination of whole circuit patterns is finished to (situation of "Yes"), determine whether the defective insulation position (step S17) that will store.In the situation that being judged to be defective insulation position (situation of "Yes"), being judged to be this wiring board is unacceptable product (step S18), in the situation that can not being judged to be defective insulation position (situation of "No"), being judged to be wiring board is certified products (step S19).
Finally, whole change-over switch A0～A4, B0～B4 are made as to the state (step S20) of shutoff, finish check processing.
In above a series of insulation inspecting method, discharge examination time of step S1 (being actually the t2 constantly of having risen from voltage to the stipulated time till t3 constantly), according to check object be printed-wiring board (PWB) a kind, manufacture in batches etc. and to be set suitable value.In this case, as above-mentioned, the stipulated time when voltage has risen can only be set in through t3 constantly the time period that voltage has risen after moment t2, can not be set in to the time period before moment t2.Therefore, as the discharge examination time, also comprise to the time period before moment t2, the electric discharge in the time of certainly can detecting the voltage shown in Fig. 2 and rise occurs, and the electric discharge in the time of can also detecting reliably the voltage stabilization shown in Fig. 3 occurs.
In addition, as the invention that patent documentation 1 is recorded, the electric current that does not detect voltage drop and detect more than the threshold value of regulation increases, and has discharge off to occur, and will after change-over switch conducting, after the stipulated time (t1-t0), start current detecting thereby detect during till step S7.Therefore, the impact that the electric current after not applied by voltage is and then unsure state, detects electric discharge and occurs.
As the invention that patent documentation 1 is recorded, detect electric discharge generation by voltage drop in the situation that, the power source performance of the voltage applying according to supply, such as in the situations such as constant pressure source, the value of the voltage drop between the circuit pattern occurring because of electric discharge is little, therefore, cannot detect voltage drop, likely cannot detect reliably electric discharge and occur.In addition, from voltage, applying detect voltage starting in the situation that, and if then voltage electric signal just occurs after applying is unsure state, as voltage drop, detect mistakenly, have the danger that becomes misinterpretation.
In the present embodiment, due between the amphibolia after avoiding voltage and then and applying, from the moment t1 shown in Fig. 2 and Fig. 3, detecting electric current increases, so can not produce misinterpretation, and detect reliably electric discharge, occurs.
Fig. 5 and Fig. 6 represent block scheme and the process flow diagram of the 2nd embodiment of the present invention, are for applying voltage, and the time till when this voltage can have been risen is set as the figure of time arbitrarily.In applying voltage control unit 5, setting can be set the voltage rising time setup unit 31 that applies the time till starting when voltage has risen from voltage.The embodiment of other textural element and Fig. 1 is same, so add the label identical with Fig. 1 in Fig. 5, description thereof is omitted.In addition, in Fig. 6, also to the process flow diagram with Fig. 4, common processing adds identical label and simplified illustration (for Fig. 7 too later).
First, first will apply voltage and be set as 0V, set the discharge examination time, and set the voltage rising time (step S25) as target.Then, carried out with the same step S2～step S5 of the 1st embodiment shown in Fig. 4 till processing after, voltage rising value (step S26) according to magnitude of voltage and voltage rising time calculating time per unit, starts the voltage rising (step S27) by the voltage rising value generation of this time per unit.Then, carried out with the same step S6～step S8 of the 1st embodiment till processing after, according to the rising settling signal of the detecting unit 8 that risen from voltage, determine whether through the voltage rising time (step S28) of setting.Being judged to be through voltage rising time in the situation that (situation of "Yes"), stop voltage and rise (step S29), the processing of execution step S9.In step S28, cannot be judged to be through voltage rising time in the situation that (situation of "No"), proceed to the processing of step S9, after, carry out the processing same with the 1st embodiment.
In the 2nd embodiment, by can at random setting from the time applying till voltage starts when above-mentioned voltage has risen, even thereby moment add that apply voltage time electric discharge occurs instantaneously and be difficult to detect in the situation that, also can pass through the suitably setting voltage rise time, detect reliably the generation of electric discharge, can correctly carry out the judgement of the unacceptable product of wiring board.
Fig. 7 and Fig. 8 represent the process flow diagram of the 3rd embodiment of the present invention, electric discharge occur to be detected to the electric current of not only usining more than the threshold value of regulation increase as necessary condition, and using this electric current increase the required time in predetermined electric current increases the scope of judgement time also as the embodiment of necessary condition.At electric current, increase detecting unit 9 and comprise that this electric current increases the measuring ability of required time.At electric discharge identifying unit 25, comprise that the setting of the judgement time that relevant electric current increases and this judgement time and actual electric current increase the function such as relatively of required time.In electric discharge identifying unit 25, setting can will judge that according to the batch of printed-wiring board (PWB) etc. the electric current that time change is reasonable time increases judgement time setting unit 32.And, at electric current, increase in detecting unit 9, except output current increases signal, also exporting relevant electric current increases the signal of required time, at this electric current, increase the time in the situation that electric current increases in the scope of judgement time, in electric discharge identifying unit 25, be judged to be electric discharge has occurred.The embodiment of other textural element and Fig. 1 is same.
In the 3rd embodiment, first set and apply voltage, set the discharge examination time, and set the judgement time (step S31) that relevant electric current increases.Then, carried out with the same step S2～step S5 of the 1st embodiment shown in Fig. 4 till processing after, in step S8 with specified period sampling the current signal from current detecting unit 7 outputs, more than judging whether current value has increased the threshold value of regulation.Be judged to be (situation of "Yes") detect electric current and increase in the situation that, and then judging that this electric current increases the required time whether in electric current increases the scope of judgement time (step S32).Being judged to be, electric current increases the required time in the situation that in the scope of the time of judgement (situation of "Yes"), as the situation that detects electric discharge generation, being judged to be this printed-wiring board (PWB) is unacceptable product (step S10).
In step S32, cannot be judged to be that electric current increases the required time in the situation that in the scope of the time of judgement (situation of "No"), proceed to step S9, after, carry out the processing same with the 1st embodiment of Fig. 4.
So, by the detection increasing except electric current, increase the required time to be judged to be printed-wiring board (PWB) in the scope of judgement time of regulation time be unacceptable product detecting electric current, can prevent the misinterpretation that noise causes, can correctly carry out the judgement of the unacceptable product of wiring board.
Fig. 9 represents the process flow diagram of the 4th embodiment of the present invention, be with different value set for discharge examination apply voltage and for insulation resistance, calculate execute alive embodiment.
In the present embodiment, applying voltage control unit 5 is set as the voltage applying between circuit pattern the discharge examination voltage that occurs for detection of electric discharge and detects one of them of voltage for calculating the insulation resistance of insulation resistance.Discharge examination voltage is set to such an extent that be greater than insulation resistance detection voltage, and for example, discharge examination voltage is set to 200V, and insulation resistance detects voltage and is set to 100V.
First, will apply voltage and be set as discharge examination voltage Vs, and set the discharge examination time (step S35).Then, by carrying out the step S2 same with the 1st embodiment of Fig. 4 to the processing of step S9, based on from voltage, has risen till passing through the stipulated time during electric current increase signal determining whether there is electric discharge (step S8 and step S9).Then, whole change-over switches are turn-offed to (step S36), judge the combination of all circuit patterns discharge examination inspection (step S37) that whether is through with.In the situation that cannot be judged to be all inspections that is through with (situation of "No"), the processing with the reiteration of table 1 from step S2.
And, in the situation that be judged to be all inspections that is through with (discharge examination inspection) (situation of "Yes") in step S37, to apply voltage and be set as insulation resistance detection voltage Vi (step S38), check the state of insulation between each circuit pattern.
; the main change-over switch B0 conducting of general-side (step S39); and the main change-over switch A0 conducting of general+side (step S40); according to table 1; by one among+side change-over switch A1～A4 above conducting (step S41), by an above conducting (step S42) among-side change-over switch B1～B4.Then,, from carrying out calculated resistance value R with later voltage V and the current i of the same step S11 of the 1st embodiment of Fig. 4, thereby carry out, carry out the processing that the quality of state of insulation is judged.
In this 4th embodiment, owing to being divided into discharge examination voltage and insulation resistance, detect voltage, so can set best voltage according to inspection separately.In addition, discharge examination voltage is set as being greater than the high pressure that insulation resistance detects voltage, can detects more reliably electric discharge and occur.
Above, the embodiments of the present invention are illustrated, but the present invention is not limited to these embodiments, in the scope that does not depart from aim of the present invention, can adds various changes.
For example, in each embodiment, comparison resistance value R and judgement resistance value Rj in step S13, in the situation that be judged to be the resistance value R calculating, judge more than resistance value Rj (situation of "No"), in step S14, store defective insulation position, after all inspections finish, if there is the defective insulation position of storage, be judged to be unacceptable product.But, in the situation that the result of determination of step S13 is "No", also can carry out the processing till finishing to all inspections, and be judged to be unacceptable product.
In addition, at electric current, increase in detecting unit 9, also can change sampling from the interval of the current signal of current detecting unit 7.Thus, by coupling noise states, set assay intervals, can detect reliably the generation of electric discharge, can more correctly carry out the judgement of unacceptable product.
In addition, also can suitably change from voltage and apply zero hour t0 to the time till the current detecting t1 zero hour.Thus, even if the crank-up time that and then voltage applies the electric signal after beginning changes, also can detect reliably the generation of electric discharge, can correctly carry out the judgement of the unacceptable product of wiring board.
The application requires based on the right of priority of on July 31st, 2012 No. 2012-170642, the Patent of Japanese publication, by its content quotation in this.
Claims (10)
1. the insulation inspecting device of a printed-wiring board (PWB), between the circuit pattern of printed-wiring board (PWB), apply DC voltage, the insulating resistance value that the current value flowing through between the magnitude of voltage based on applying and described circuit pattern is calculated is judged the quality of the state of insulation between described circuit pattern, it is characterized in that, comprising:
Apply voltage control unit, its control applies voltage;
Electric current increases detecting unit, its the current detecting zero hour from voltage applies beginning to using voltage while having risen as starting point through the discharge examination till the moment of stipulated time in the time, detect and result from the electric discharge that occurs between described circuit pattern and more than whether having increased at the current value flowing through between described circuit pattern the threshold value of stipulating;
Electric discharge identifying unit, it increases that to be judged to be described printed-wiring board (PWB) be unacceptable product in the situation that increase more than the threshold value that detecting unit detects described regulation electric current by described electric current; And
Discharge examination time setting unit, it can set the described stipulated time.
2. the insulation inspecting device of printed-wiring board (PWB) as claimed in claim 1, is characterized in that,
The described voltage control unit that applies is for asking the insulation resistance of described insulating resistance value to detect voltage or being greater than one of them voltage that described insulation resistance detects the discharge examination voltage of voltage by the described Control of Voltage that applies, judge that the fine or not state of insulation identifying unit of described state of insulation is according to detecting through after-applied described insulation resistance of described discharge examination time the quality that voltage calculates the described insulating resistance value between described circuit pattern and judges state of insulation, described electric current increase detecting unit detects the electric current being caused by the described discharge examination unit applying in the time in described discharge examination to be increased.
3. the insulation inspecting device of printed-wiring board (PWB) as claimed in claim 1 or 2, is characterized in that,
The described voltage control unit that applies also comprises: voltage rising time setup unit, it is set from described voltage and applies the time till starting when described voltage has risen.
4. the insulation inspecting device of printed-wiring board (PWB) as claimed in claim 1 or 2, is characterized in that,
The electric current that described electric current increases more than the threshold value that detecting unit also detects described regulation increases the required time, the electric current that described electric discharge identifying unit is being increased more than the threshold value that detecting unit detects described regulation by described electric current increases, and increases the required time when predetermined electric current increases in the scope of judgement time, to be judged to be printed-wiring board (PWB) be unacceptable product detecting described electric current.
5. the insulation inspecting device of printed-wiring board (PWB) as claimed in claim 4, is characterized in that,
Described electric discharge identifying unit also comprises: electric current increases judges time setting unit, and it changes described electric current increases the judgement time.
6. the insulation inspecting method of a printed-wiring board (PWB), it applies DC voltage between the circuit pattern of printed-wiring board (PWB), the insulating resistance value that the current value flowing through between the magnitude of voltage based on applying and described circuit pattern is calculated is judged the quality of the state of insulation between described circuit pattern, it is characterized in that, comprising:
Preset current detecting zero hour from voltage applies beginning and as starting point, pass through the step of the discharge examination time till the moment of stipulated time while having risen to usining voltage;
In described discharge examination, in the time, detecting the current value flowing through between described circuit pattern has increased the step more than threshold value of stipulating; And
In the situation that be judged to be the step that described printed-wiring board (PWB) is unacceptable product more than detecting the current value flowing through between described circuit pattern and increased the threshold value of described regulation.
7. the insulation inspecting method of printed-wiring board (PWB) as claimed in claim 6, is characterized in that,
By the described Control of Voltage that applies for for asking the insulation resistance of described insulating resistance value to detect voltage or being greater than one of them voltage that described insulation resistance detects the discharge examination voltage of voltage, and increased that more than the threshold value of described regulation to be judged to be described printed-wiring board (PWB) be unacceptable product in the situation that described discharge examination detects current value that described discharge examination voltage causes in the time.
8. the insulation inspecting method of the printed-wiring board (PWB) as described in claim 6 or 7, is characterized in that,
Preset from described voltage and apply the time till starting when described voltage has risen.
9. the insulation inspecting method of the printed-wiring board (PWB) as described in claim 6 or 7, is characterized in that, also comprises:
In the situation that more than detecting the current value flowing through between described circuit pattern and having increased the threshold value of described regulation, also detect the step of the current value flowing through between described circuit pattern required time that increases the threshold value of described regulation till above,
Detecting this time, when predetermined electric current increases in the scope of judgement time, to be judged to be printed-wiring board (PWB) be unacceptable product.
10. the insulation inspecting method of printed-wiring board (PWB) as claimed in claim 9, is characterized in that, also comprises:
Changing described electric current increases the step of judgement time.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPJP2012-170642 | 2012-07-31 | ||
| JP2012-170642 | 2012-07-31 | ||
| JP2012170642A JP5727976B2 (en) | 2012-07-31 | 2012-07-31 | Printed circuit board insulation inspection apparatus and insulation inspection method |
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| Publication Number | Publication Date |
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| CN103576058A true CN103576058A (en) | 2014-02-12 |
| CN103576058B CN103576058B (en) | 2017-11-21 |
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| CN201310321437.0A Active CN103576058B (en) | 2012-07-31 | 2013-07-29 | The insulation inspecting device and insulation inspecting method of printed substrate |
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| Country | Link |
|---|---|
| JP (1) | JP5727976B2 (en) |
| KR (1) | KR102004842B1 (en) |
| CN (1) | CN103576058B (en) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898464A (en) * | 2014-03-06 | 2015-09-09 | 大族激光科技产业集团股份有限公司 | Insulation test control module |
| CN113533909A (en) * | 2020-04-15 | 2021-10-22 | 雅马哈精密科技株式会社 | Inspection apparatus and inspection method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102132860B1 (en) | 2020-03-17 | 2020-07-10 | 주식회사 나노시스 | Printed circuit board test system |
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| JP2003172757A (en) * | 2001-09-26 | 2003-06-20 | Nidec-Read Corp | Insulation inspection device and insulation inspection method of circuit board |
| CN101292166A (en) * | 2005-10-18 | 2008-10-22 | 日本电产理德株式会社 | Insulation inspecting device and insulation inspecting method |
| CN101907669A (en) * | 2009-06-04 | 2010-12-08 | 迈克珂来富株式会社 | Printed circuit board testing device and testing method |
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| CN113533909A (en) * | 2020-04-15 | 2021-10-22 | 雅马哈精密科技株式会社 | Inspection apparatus and inspection method |
Also Published As
| Publication number | Publication date |
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| TWI577997B (en) | 2017-04-11 |
| CN103576058B (en) | 2017-11-21 |
| JP2014029311A (en) | 2014-02-13 |
| KR20140016828A (en) | 2014-02-10 |
| JP5727976B2 (en) | 2015-06-03 |
| KR102004842B1 (en) | 2019-07-29 |
| TW201405148A (en) | 2014-02-01 |
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