CN2575932Y - Cyclone powder machine - Google Patents
Cyclone powder machine Download PDFInfo
- Publication number
- CN2575932Y CN2575932Y CN 02248286 CN02248286U CN2575932Y CN 2575932 Y CN2575932 Y CN 2575932Y CN 02248286 CN02248286 CN 02248286 CN 02248286 U CN02248286 U CN 02248286U CN 2575932 Y CN2575932 Y CN 2575932Y
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- CN
- China
- Prior art keywords
- circuit
- voltage
- voltage comparator
- input
- control circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model relates to a monitoring device for welding conditions of a circuit board. The utility model comprises a voltage comparator, a reference voltage generating circuit, a testing circuit, a control circuit and a scanner, wherein, the reference voltage generating circuit is connected with the reverse input end of the voltage comparator; the testing circuit is connected with the forward input end of the voltage comparator, the control circuit is connected with the output end of the voltage comparator, and the other end of the control circuit is connected with a scanner. When the utility model conducts monitoring by means of the connection of the circuits, the voltage comparator conducts comparison between a reference voltage and the voltage of the testing circuit, if the circuit board which is to be tested is poorly welded, the voltage of the testing circuit is higher than the reference voltage, a current flows out of the output end of the voltage comparator so as to drive the control circuit to act, and information is transferred to the scanner and recorded so that an operator can further process the information.
Description
Technical field
The utility model relates to a kind of monitoring device, especially a kind of monitoring device of real dress wiring board welding situation.
Background technology
In industrial production, want testing PC board (PCBA) assembly welding reliability usually, during especially to the printed substrate performance of having relatively high expectations, more to see the requirement that whether can reach application to its detection of carrying out various strictnesses.Solder joint bad point occurs and generally includes following situation:
1. printed substrate circuit breakaway;
2. solder joint ftractures;
3. assembly fracture.
Bad naming a person for a particular job occur and cause the paralysis of whole circuit.For guaranteeing that printed substrate is performance and quality; it detects usually and can carry out under thermal shock and humidity impact; thermal shock is provided with a maximum temperature and a minimum temperature; the variation of in this temperature, constantly rising and descending; the laboratory utilizes this kind emulation to quicken the aging of wiring board and assembly, bad point occurs.And humidity is impacted and to be meant to increase or reduce humidity in 0-100 scope, simulate actual effect and quicken the aging of wiring board, to detect solder joint at last and bad some situation in which time cycle, occur, this kind detection is manually to carry out at first, do on-the-spot the detection in the temperature environment that humidity environment and people's physical efficiency are born, judge bad some situation, this kind detection makes test environment limited, because under excessive temperature and the too high moisture, manually can not carry out, this kind testing environment is very abominable in addition, and the testing staff can't bear mostly.Improvement along with technology, someone proposes with circuit as the monitoring clue, judge the bad some situation of printed substrate (PCBA) as signal with its break-make, but this kind detection can not receive information in real time, and with its record, thereby be badly in need of a kind of real-time monitoring circuit at present and monitor the state of solder joint under the whole process that thermal shock and humidity are impacted, and make mark.
And the functional requirement of this observation circuit is: 1. when the resistance value of printed substrate (PCBA) during greater than setting for bad point occurring, a bad dot information appears in circuit.When printed substrate (PCBA) resistance value when the regulation resistance value fluctuates up and down, circuit will in time be caught each fault message.The information that 3 circuit are sent must be a high level pulse.
Summary of the invention
The utility model is that purpose provides a kind of monitoring device, and it can monitor the bad some situation of solder joint under thermal shock and humidity impact in real time; This device comprises a voltage comparator, a generating circuit from reference voltage, a test circuit, a control circuit and one scan instrument, this generating circuit from reference voltage is connected to the reverse input end of voltage comparator, this test circuit is connected to the positive input of voltage comparator, and this control circuit is connected to the output of voltage comparator; Described control circuit connects an electromagnetic relay by a triode and forms, after opening this observation circuit, by this voltage comparator the voltage in reference voltage and the test circuit is compared, if bad point appears in real dress wiring board, when the voltage in its test circuit can be higher than reference voltage, send a high level pulse in the circuit, the voltage comparator output has electric current to flow out and drives control circuit makes action, information is delivered to scanner, is for further processing.The highly sensitive basic demand that meets monitoring of above-mentioned observation circuit, and the simplicity of design of circuit, cost is low.
Description of drawings
Below in conjunction with accompanying drawing this utility model is described further:
Fig. 1 is the circuit block diagram of the utility model;
Fig. 2 is the circuit structure diagram of the utility model.
Embodiment
See also Fig. 1, the utility model is a kind of circuit board welding condition monitoring device, this device comprises a voltage comparator 38, a generating circuit from reference voltage 3, a test circuit 4, a control circuit 45 and one scan instrument 51, these circuit also are connected to each other together by circuit, wherein, the positive and negative input of voltage comparator 38 is connected with test circuit 4 and generating circuit from reference voltage 3 respectively, this control circuit 45 is connected to the output of voltage comparator 38, and its other end is connected to scanner 51; During operation, the two point of appointing on the circuit board to be detected is connected respectively on two open contact 35 (see figure 2)s in the test circuit 4, when making the operator see through monitoring by foregoing circuit, can compare by reference voltage in 38 pairs of generating circuit from reference voltage 3 of this voltage comparator and the voltage in the test circuit 4, if during this circuit board under test contact failure welding, the voltage of generation can be higher than the reference voltage that generating circuit from reference voltage 3 is produced in the test circuit 4, make voltage comparator 38 output output currents, this output current can flow to control circuit 45, and Drive and Control Circuit 45 starts, this message is delivered to scanner 51, make the operator note, be for further processing.
See also Fig. 2, described generating circuit from reference voltage 3 includes first resistance 31 and second resistance 32 of mutual series connection, and this first resistance 31 and second resistance 32 also are connected to the reverse input end of voltage comparator 38 by circuit; In addition, 4 of this test circuits include and are used for two open contacts 35 of appointing two point to be connected with circuit board under test (PCBA), and the 3rd resistance 43 that is cascaded and the 4th resistance 44, and this test circuit 4 and be connected to the positive input of voltage comparator 38 by circuit.
Again, control circuit 45 includes capacitor 39, diode 36, triode 47 and electromagnetic relay device 10, this capacitor 39 and the output that is connected to voltage comparator 38 after triode 47 base stages are connected, described diode 36 negative electrodes are connected with triode 47 base stages with capacitor 39, and the plus earth of this diode 36.Moreover this electromagnetic relay device 10 is made up of inductance coil 40 and contact 7,8,9, inductance coil 40 and be connected wherein with the collector electrode of triode 47, and in addition, 8 of contacts are received scanner 51.These circuit and mat circuit are connected with a power supply, so that by the required power supply of this power supply (Vcc) supply.Certainly, some assembly can replace with other equivalent elements in this circuit, and for example: this voltage comparator 38 can be an operational amplifier.
During use, connect with the mains earlier, again with circuit board under test with after two open contacts 35 of this test circuit 4 are connected, compare by reference voltage in 38 pairs of generating circuit from reference voltage 3 of this voltage comparator and the voltage on the test circuit 4, and real bad dot information of dress wiring board is reflected by actual act.
Be convenient and describe that below abbreviate first resistance 31 as R1, second resistance 32 abbreviates R2 as, the 3rd resistance 43 abbreviates R3 as, and the 4th resistance 44 abbreviates R4 as, and real dress wiring board PCBA resistance abbreviates Rpcb as, and power supply 37 abbreviates Vcc as, and its magnitude of voltage is Ucc.
Supply voltage Ucc is a fixed value in this observation circuit, above-mentioned resistor satisfied following relation: R1=R2=R3 so voltage comparator 38 reverse input end voltages can be used as reference voltage, its value is U-=R2/ (R2+R1) * Ucc, if establish R4+Rpcb=Rx, voltage comparator 38 positive input magnitude of voltage U+=Rx/ (Rx+R3) * Ucc then, the resistance of Rpcb directly determines voltage comparator 38 positive input magnitudes of voltage as from the foregoing, and promptly voltage comparator 38 positive input magnitudes of voltage change with Rpcb.
During test, wiring board to be measured (PCBA) is connected on the two open contacts 35, when normal condition was promptly gone bad point, voltage comparator 38 was in low level.If bad point appears in this wiring board to be measured (PCBA), it is R4+Rpcb＞R2 that U+＞U-can appear in this moment, voltage comparator 38 jumps to high level by low level, these voltage comparator 38 outputs have electric current output, capacitor 39 positive plates and negative plate conducting (because the characteristic of capacitor, its positive plate of capacitor and negative plate conducting when its both end voltage increases suddenly, formation one is path in short-term), this electric current flows into triode 47 base stages, flows to inductance coil 40 after it amplifies, and makes electromagnetic relay device 10 produce action, electromagnetic force is drawn to contact 8 with contact 7, information is delivered to scanner 51, and goes on record, and is for further processing.
In the course of action of the bad point of above appearance, capacitor 39 is in charged state always, after capacitor 39 chargings are saturated, no current passes through on the triode 47, and electromagnetic relay device 10 stops action, and contact 9 places are got back to down in contact 7, capacitor 39 discharge immediately then, this moment, diode 36 forward conductions formed a discharge path, and electric charge on the capacitor 39 is bled off.Whole monitoring device reenters monitoring state.
Claims (5)
1, a kind of circuit board welding condition monitoring device is characterized in that:
One voltage comparator has two inputs at least;
One generating circuit from reference voltage, its output is connected to the first input end of voltage comparator;
One test circuit, its output are connected to second input of voltage comparator;
One control circuit, the input of this control circuit is connected to the output of voltage comparator;
The one scan instrument, the input of this scanner is connected to the output of control circuit;
The input voltage of more described first, second input of described voltage comparator, when the input voltage of second input was higher than the voltage of first input end, described control circuit was made action, and information is delivered to scanner.
2, circuit board welding condition monitoring device according to claim 1, it is characterized in that: described control circuit includes an electric capacity and a diode, a triode and an electromagnetic relay device, wherein, electric capacity links to each other with transistor base, and in addition, the negative electrode of diode is connected to electric capacity and transistor base, its anode is ground connection then, moreover the collector electrode of this triode is received the solenoid of electromagnetic relay device, and its emitter is ground connection then;
3, circuit board welding condition monitoring device according to claim 1, it is characterized in that: described voltage comparator can be an operational amplifier, and its first input end is a reverse input end, and its second input is a positive input;
4, circuit board welding condition monitoring device according to claim 1, it is characterized in that: this test circuit is formed by two resistor in series, and wherein a resistor is connected with two contacts such as grade on the circuit, and these contacts keep a determining deviation.
5, circuit board welding condition monitoring device according to claim 1, it is characterized in that: described generating circuit from reference voltage comprises the series resistance of two equivalences.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02248286 CN2575932Y (en) | 2002-09-27 | 2002-09-27 | Cyclone powder machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02248286 CN2575932Y (en) | 2002-09-27 | 2002-09-27 | Cyclone powder machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2575932Y true CN2575932Y (en) | 2003-09-24 |
Family
ID=33718949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02248286 Expired - Lifetime CN2575932Y (en) | 2002-09-27 | 2002-09-27 | Cyclone powder machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2575932Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108615718A (en) * | 2018-05-11 | 2018-10-02 | 上海华力集成电路制造有限公司 | Electric fuse circuit and fuse cell architecture |
| CN112345982A (en) * | 2020-09-29 | 2021-02-09 | 歌尔科技有限公司 | Method and device for detecting welding condition of circuit element |
| CN112444656A (en) * | 2019-09-03 | 2021-03-05 | 英飞凌科技股份有限公司 | Device and method for inspecting at least one soldered connection between a circuit board and a current sensor |
-
2002
- 2002-09-27 CN CN 02248286 patent/CN2575932Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108615718A (en) * | 2018-05-11 | 2018-10-02 | 上海华力集成电路制造有限公司 | Electric fuse circuit and fuse cell architecture |
| CN112444656A (en) * | 2019-09-03 | 2021-03-05 | 英飞凌科技股份有限公司 | Device and method for inspecting at least one soldered connection between a circuit board and a current sensor |
| CN112345982A (en) * | 2020-09-29 | 2021-02-09 | 歌尔科技有限公司 | Method and device for detecting welding condition of circuit element |
| CN112345982B (en) * | 2020-09-29 | 2023-05-26 | 歌尔科技有限公司 | Circuit element welding condition detection method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20120927 Granted publication date: 20030924 |