CN204154860U - A kind of circuit board detection device - Google Patents
A kind of circuit board detection device Download PDFInfo
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- CN204154860U CN204154860U CN201420598705.3U CN201420598705U CN204154860U CN 204154860 U CN204154860 U CN 204154860U CN 201420598705 U CN201420598705 U CN 201420598705U CN 204154860 U CN204154860 U CN 204154860U
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Abstract
The utility model relates to a kind of circuit board detection device, comprises power supply stabilization circuit and connected detection chip, RS232 circuit, I0 Port detecting circuit, serial communication circuit; Detection chip is connected with RS232, I0 Port detecting circuit, serial communication circuit.The utility model is simple to operate, repetitive operation is farthest utilized circuit board function detection equipment to complete, and reduces the workload of testing staff, improves detection efficiency, saves cost of labor.
Description
Technical field
The utility model relates to the device that a kind of circuit board detecting uses, a kind of circuit board function detection device specifically, and the field mainly depended on comprises Based Intelligent Control and electric detection field.
Background technology
The electric peripheral hardware integrity detection of any circuit board and fault diagnosis are not man-to-man relation, may have same trouble spot and have different phenomena of the failure in testing process.Such as " short-circuit condition " trouble spot, adjacent at two signal paths T1, T2, and under the state of short circuit each other, just there will be different phenomena of the failure: when T1 state for high, T2 state are low, owing to being short-circuited, T1, T2 state is low (fault); When T1 state be high, T2 state for high, owing to being short-circuited, T1, T2 state is height (normally); When T1 state be low, T2 state for high, owing to being short-circuited, T1, T2 state is low (fault); Be low when T1 state is low, T2 state, owing to being short-circuited, T1, T2 state is low (normally); Now will there is different phenomena of the failure in these four kinds of states owing to being short-circuited.Also may have same phenomenon of the failure and there is different trouble spots, so for equipment failure homogeneity and diversity, bring complicacy just to comparatively speaking the fault detect of equipment.And in the process of producing product of reality, each equipment all needs repeatedly to check work, may need every day to repeat a detection.
But the circuit board peripheral functionality pick-up unit just at present existed, function is perfect not, and cost performance height is their common ground.Each pick-up unit can only detect partial function characteristic, if think the more equipment of performance need of complete analysis circuit plate, and most of checkout equipment is merely able to analyze phenomenon of the failure, trouble spot can not be listed, and such pick-up unit is due to existing market scarcity, and relative price is expensive.
Utility model content
For the deficiencies in the prior art, the utility model provide a kind of core circuit plate electrically detect with maintenance job in reduce to a certain extent work complicacy, increase and detect and the pick-up unit of maintenance core circuit plate efficiency.
The technical scheme that the utility model is adopted for achieving the above object is: a kind of circuit board detection device, comprising: power supply stabilization circuit and connected detection chip, RS232 circuit, I0 Port detecting circuit, serial communication circuit; Detection chip is connected with RS232, I0 Port detecting circuit, serial communication circuit.
Described I0 Port detecting circuit comprises latch and 8 triodes; 8 input ends of latch are connected with the drive interface of circuit-under-test plate respectively by resistance, and 8 output terminals are connected with the base stage of 8 triodes respectively; The collector of 8 triodes detects interface with the IO of circuit-under-test plate and is connected, grounded emitter; The control end of latch is connected with the IO port of detection chip.
Described I0 Port detecting circuit is multiple.
Described power supply stabilization circuit adopts power conversion chip, the electric capacity that the power input of power conversion chip is in parallel with being connected with 3 between earth terminal, and two are connected with 4 electric capacity in parallel between power output end with earth terminal; Two power output ends and earth terminal are also connected with 9 electric capacity in parallel.
Described detection chip adopts model to be the MCU of STC89C52.
The utility model has following beneficial effect and advantage:
1, the utility model is simple to operate: utilize the stationary installations such as probe to be fixed in a device by test board, only need to complete placement according to the position of pilot hole, be then fixed when testing circuit board to be detected.Only need during detection to treat the download that check-out console carries out test procedure, all information detected all can be uploaded to PC by circuit board function detection device, is understood the functional characteristic of circuit board to be detected by Detection Information.
2, the utility model reduces a large amount of work repeated: by the program design of solidification, repetitive operation farthest utilized circuit board function detection equipment to complete, and reduces the workload of testing staff, improves detection efficiency, saves cost of labor.
3, the convenient debugging of the utility model: utilize serial ports that information is uploaded to PC in the utility model device, utilize switch triode Q to realize the automatic control of program, just need not can detect all logic states by human intervention.
4, this utility model reduces the complexity of testing, some theoretical foundations of intelligent control system are established, present typical circuit application form in checkout equipment, fault detection and diagnosis work efficiently comprehensively can be carried out to the hardware platform electrically detected, reduce to a certain extent and simplified the quantity of maintainer.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is the schematic diagram detecting circuit to be detected;
Fig. 3 a is the logic control circuit figure of IO Port detecting circuit;
Fig. 3 b is the current-limiting circuit figure of IO Port detecting circuit;
Fig. 4 is the on-off circuit figure of IO Port detecting circuit;
Fig. 5 a is power supply stabilization circuit figure mono-;
Fig. 5 b is power supply stabilization circuit figure bis-;
Fig. 6 is RS232 circuit.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
The utility model is a kind of circuit board carrying out designing with C8051F120 single-chip microcomputer for hardware platform carries out a kind of electrical detection facility of detecting, by circuit board to be detected, utilize STC89C52 to carry out the control of logic state, all Peripheral Interfaces treating check-out console carry out electrical integrity detection.
As shown in Figure 1, a kind of circuit board function detection device, has:
IO Port detecting circuit, the emission port treated on testing circuit plate carries out being connected and detecting with receiving port.Described IO Port detecting circuit has signal isolation and the controlling functions of latch, is affected the different on off states of input port, utilize the functional completeness of the different path of same electric circuit inspection by NPN triode control output end mouth level.
Power supply stabilization circuit, provides power filter and the voltage stabilizing function of circuit board to be detected, can continue and stable provide+3.3V and+5V voltage, exporting the RS232 circuit in circuit to be detected and the utility model, MCU, IO Port detecting circuit respectively to.As shown in Figure 5 a, power supply stabilization circuit has the function of operating voltage voltage stabilizing, the DC voltage of three terminal regulator AS1117 to input is utilized to carry out step-down, be stabilized in device can magnitude of voltage, carried out the filtering of power supply ripple by polarity free capacitor C10, tantalum electric capacity E1, stablizing of assurance device operating voltage environment simultaneously.Wherein, C10, C35, C12 are polarity free capacitor, and E10, E1, E2, E4 are tantalum electric capacity.The problem that the MCU duty avoiding the change due to operating voltage to cause changes.As shown in Figure 5 b, C37, C38, C39, C40, C42 are polarity free capacitor, and E9, E11, E15, E16 are tantalum electric capacity.This part in parallel electric capacity major function is exactly the stray capacitance that reduction PCB cabling produces.
Pick-up unit utilizes Switching Power Supply to provide 5V DC voltage, circuit to be detected needs 3.3V direct current, therefore the DC/DC change function of power supply is carried out by AS1117/3.3V, wherein polarity free capacitor C12 and tantalum electric capacity E2, E4 mainly carry out filtering to 5V voltage, ensure that the fluctuation range of voltage stabilizing chip input voltage meets ripple requirement, the electric capacity (as shown in Figure 5 b) that output terminal connects mainly to needing the 3.3V voltage of power supply to carry out impedance matching, reduces stray capacitance to the impact on circuit performance.
Serial communication circuit connects the UART1 of circuit board to be detected by UART of the present utility model, controls input and the output state of circuit board to be detected.Two kinds of different controller C8051F120 (U1) and STC89C52 (U2) communicate to connect by described serial communication circuit.
RS232 circuit, is sent to PC by the state real-time of circuit board detection device.RS232 circuit can communication between finishing device information and PC, convenient to the understanding of device detected state and the fault diagnosis of circuit board to be detected, utilizes SP3223 by the seamless conversion between Transistor-Transistor Logic level and RS232 level, as shown in Figure 6.
The circuit board detection device designed is carried out with STC89C52 controller, need the connection of drafting board corresponding ports to be checked, in order to the Different Logic state of same port can be detected, in test board, the switching function of connecting link by triode is control effectively, the specific implementation of test board hardware capability circuit as shown in Figure 2, first input end YCF, ZCJS_F, JCKC_F, JCDWF, BY1F, BY2F, FCF, KCF of 74HC573 are for connecting the drive interface of circuit board to be detected, as shown in Fig. 3 a, 3b, level perseverance is high; And the chip selection signal of latch is connected with the P0.0 of pick-up unit controller STC89C52, for control inputs and output state; As shown in Figure 4, when the output terminal of latch is high, triode Q41 ~ Q48 base voltage is high, collector and emitter level almost equal, detect with circuit board IO to be detected YC, ZCJS, JCKC, JCDW, BY1, BY2, FC, KC pin level that interface is connected and set low.Due to the input pin that YC, ZCJS, JCKC, JCDW, BY1, BY2, FC, KC pin is in circuit board to be detected, and by hardware configuration pull-up resistor, so state be height usually.
Due to the restriction of drafting board I/O interface circuit to be checked, the input/output function of Digital I/O is fixed, and needs to be divided into three kinds of forms in testing process.By judging the level of input port under original state during detection, verify the functional completeness of input port in circuit board to be detected, if under original state, incoming level be height, then can judge that the input circuit YCS of circuit board to be detected etc. normally; Then P0.0 sets low, triode ON, and incoming level is low, then can judge that the drive interface circuit of circuit board to be detected is complete; If drafting board to be checked organizes input, output interface more, IO Port detecting circuit can be multiple; When drafting board to be checked has two interfaces, adjacent legs adopts different control latch 1,2, if latch 1 conducting, then latch 2 ends, and now judge the state of the IO detection interface that latch 2 connects, high level state then illustrates that this branch road and other branch roads are without short circuit phenomenon, if do not meet the high level logic state of corresponding ports, then can judge that this branch road has problems at present, and by trouble spot by serial ports UART, utilize SP3223 to be transferred to PC as serial port level chance-over circuit.
As shown in Figure 2, in circuit board to be detected, MCU (C8051F120) and IO drive that interface, IO detect interface, UART0, UART1 are connected; UART0 is connected with PC by RS232 circuit, and UART1 is connected by UART and STC89C52MCU of the present utility model.IO detects the IO input port that interface is C8051F120MCU, the logic state of interface is driven for detecting IO, in order to detect accurately, IO detects interface and adopts reverse Schmidt trigger, it is utilized to carry out the transmission of signal level, the collector of triode in the input end connection layout 4 of reverse Schmidt trigger, output terminal connects the IO port that C8051F120 has input function.IO driving interface is the IO output port of C8051F120MCU, and the IO port being directly connected to STC89C52 carries out state-detection.Drive interface is as the input of IO Port detecting circuit, be connected with latch inputs after current-limiting resistance, wherein 74HC573 latch cicuit control signal wire is connected to the IO port P00 etc. of STC89C52, and in Fig. 4, the base stage of triode is connected with the output of latch in IO Port detecting circuit of the present utility model.
Circuit board to be detected is also provided with drive interface, and it is for constant output high level; This interface has 8 output terminals, is connected with 8 input ends of the utility model IO Port detecting Circuit lock storage.IO drives interface to belong to common Digital I/O port, the controller STC89C52 utilizing pick-up unit is needed to carry out IO detection, the intrinsic peripheral hardware UART1 of microcontroller on circuit board to be detected is connected by UART after detection completes, data after test are sent to this MCU, this microcontroller utilizes the data that obtain and gross data to contrast, finally judge trouble spot, by trouble spot by serial ports UART0, utilize SP3223 to be transferred to PC as serial port level chance-over circuit.
Claims (5)
1. a circuit board detection device, is characterized in that comprising: power supply stabilization circuit and connected detection chip, RS232 circuit, I0 Port detecting circuit, serial communication circuit; Detection chip is connected with RS232, I0 Port detecting circuit, serial communication circuit.
2. a kind of circuit board detection device according to claim 1, is characterized in that described I0 Port detecting circuit comprises latch and 8 triodes; 8 input ends of latch are connected with the drive interface of circuit-under-test plate respectively by resistance, and 8 output terminals are connected with the base stage of 8 triodes respectively; The collector of 8 triodes detects interface with the IO of circuit-under-test plate and is connected, grounded emitter; The control end of latch is connected with the IO port of detection chip.
3. a kind of circuit board detection device according to claim 1, is characterized in that described I0 Port detecting circuit is multiple.
4. a kind of circuit board detection device according to claim 1, it is characterized in that described power supply stabilization circuit adopts power conversion chip, the electric capacity that the power input of power conversion chip is in parallel with being connected with 3 between earth terminal, two are connected with 4 electric capacity in parallel between power output end with earth terminal; Two power output ends and earth terminal are also connected with 9 electric capacity in parallel.
5. a kind of circuit board detection device according to claim 1, is characterized in that described detection chip adopts model to be the MCU of STC89C52.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420598705.3U CN204154860U (en) | 2014-10-15 | 2014-10-15 | A kind of circuit board detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420598705.3U CN204154860U (en) | 2014-10-15 | 2014-10-15 | A kind of circuit board detection device |
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| CN204154860U true CN204154860U (en) | 2015-02-11 |
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| CN201420598705.3U Active CN204154860U (en) | 2014-10-15 | 2014-10-15 | A kind of circuit board detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842613A (en) * | 2016-05-26 | 2016-08-10 | 中山市天键电声有限公司 | Bluetooth circuit testing jig |
| CN107290647A (en) * | 2017-06-29 | 2017-10-24 | 四平市吉华高新技术有限公司 | A kind of logical out of circuit test instrument |
| CN111323693A (en) * | 2020-03-18 | 2020-06-23 | Oppo广东移动通信有限公司 | Test circuit, mainboard and terminal equipment |
-
2014
- 2014-10-15 CN CN201420598705.3U patent/CN204154860U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842613A (en) * | 2016-05-26 | 2016-08-10 | 中山市天键电声有限公司 | Bluetooth circuit testing jig |
| CN107290647A (en) * | 2017-06-29 | 2017-10-24 | 四平市吉华高新技术有限公司 | A kind of logical out of circuit test instrument |
| CN107290647B (en) * | 2017-06-29 | 2024-03-22 | 四平市吉华高新技术有限公司 | On-off circuit tester |
| CN111323693A (en) * | 2020-03-18 | 2020-06-23 | Oppo广东移动通信有限公司 | Test circuit, mainboard and terminal equipment |
| CN111323693B (en) * | 2020-03-18 | 2022-01-07 | Oppo广东移动通信有限公司 | Test circuit, mainboard and terminal equipment |
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