CN103019137A - Extendable measurement channel switching circuit - Google Patents
Extendable measurement channel switching circuit Download PDFInfo
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- CN103019137A CN103019137A CN2012105215354A CN201210521535A CN103019137A CN 103019137 A CN103019137 A CN 103019137A CN 2012105215354 A CN2012105215354 A CN 2012105215354A CN 201210521535 A CN201210521535 A CN 201210521535A CN 103019137 A CN103019137 A CN 103019137A
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Abstract
The invention discloses an extendable measurement channel switching circuit. In a production test of various products with circuit boards, a central processing unit/microprogrammed control unit (CPU/MCU) is in parallel connection with a plurality of serial-in parallel-out transition chips D2-Dn, each chip of each of transition chips D2-Dn is respectively connected with a chip of one Darlington tube, the chip of each Darlington tube is repsectivley connected with one of relay K1-Kn, the CPU/MCU is further respectively connected with a chip D0 and a chip D1 of a transistor-transistor logic (TTL)-232 level, and the chip D0 is connected with an upper machine through a serial port connector X0. The extendable measurement channel switching circuit is simple in interface, low in cost and strong in universality, is not limited by instruments and meters, and can be matched with any instrument and any meter in use and perform any number of channel extension.
Description
Technical field
The present invention relates to a kind of commutation circuit, be used for the production test to various products with circuit board, such as various controls, power supply, communication, computer, automobile waits in the production test of various products with circuit board.
Background technology
The production test is the important guarantee that improves the quality of products, and for the various products with circuit board, testing requirement in process of production is more and more.At present, a large amount of uses is the instrument of each producer in the production test, as shown in Figure 1, such as multimeter, oscillograph, waveform generator etc., various instruments adopt respectively the hyperchannel integrated circuit board of the special use of corresponding manufacturer production to measure, therefore, for the circuit-under-test panel products, need much to measure passage in test process, need a large amount of relay switchs, its extensibility is bad, when maybe needing for other instrument and meters, a lot of passages of needs just are difficult to realize, and price is high, and the interface more complicated generally need to be inserted on the computer motherboard slot and could use.Some instruments can install the multi-way switch circuit plate additional, and such as 34901 of Agilent, but number of channels is limited and cost is very high, and what have does not have a multichannel switch boards, such as various oscillographs, only has at most limited several passages.Yet when having quantity of parameters to measure, testing cost just sharply increases, and in order to reduce cost, can take minimizing to need to survey the methods such as parameter to some product, causes product quality hidden danger.
Summary of the invention
The defective that the objective of the invention is in production test, to need to use in a large number for overcoming existing various products with circuit board the special multichannel integrated circuit board of each producer to test, propose a kind of measurement channel switching circuit of expanding, can not be subjected to the restriction of any instrument and meter and arbitrary extension.
The technical solution used in the present invention is: comprise a central processing unit CPU/MCU, central processing unit CPU/MCU several conversion chip D2-Dn that seal in and go out in parallel, each chip among the conversion chip D2-Dn respectively connects the chip of a Darlington transistor, the chip of each Darlington transistor connects respectively among the relay K 1-Kn, central processing unit CPU/MCU also connects respectively chip D0, the D1 that TTL turns 232 level, and chip D0 is connected with host computer by serial port connector X0.
Chip D0 is connected with host computer through serial port connector X0, and serial port connector X1 connects the serial port connector X0 of next piece commutation circuit, and the serial port connector X1 of next piece commutation circuit meets the serial port connector X0 of next piece commutation circuit again.
Interface of the present invention is simple, and cost compare is low, and is of many uses, and universal strong is not subjected to the restriction of instrument and meter, can be used in conjunction with any instrument and meter, carries out many arbitrarily passage expansions.
Description of drawings
Among Fig. 1 in the background technology with the various production test philosophy figure of circuit board;
Fig. 2 is circuit structure diagram of the present invention.
Embodiment
The present invention includes a central processing unit CPU/MCU, central processing unit CPU/MCU can use various CPU, such as the single-chip microcomputer of MCS-51 kernel, controller and the DSP of ARM kernel, CPLD, FPGA and Infineon etc., at present commonly used have 8051 or ARM.Central processing unit CPU/MCU has 6-8 interface, and wherein the 7th and the 8th is used for expansion.Central processing unit CPU/MCU several chips D2-Dn in parallel, several chips D2-Dn is the conversion chip that seals in and go out, and such as 74HC595 or 74LS164 etc., is used for the serial data of central processing unit CPU/MCU is become parallel data.
Each chip among the chip D2-Dn respectively connects the chip ULN2003A of a Darlington transistor, and namely chip Dn+1 is to Dn+n, and chip Dn+1 also can replace with two triodes to Dn+n.
Each chip ULN2003A connects respectively a relay among the relay K 1-Kn, can also with any other relays that meet test request, can select different withstand voltage Darlington transistors according to different Control voltage.
Central processing unit CPU/MCU also connects respectively chip D0 and chip D1, with the TTL(logic gates) turn 232 level, so that central processing unit CPU/MCU and computer or other circuit communicate, in the situation that do not need to expand, the circuit that only needs a TTL to turn 232 level is just passable, telecommunication circuit also can realize by other means, such as USB etc.
Chip D0 is connected with host computer (industrial computer) with the serial port connector X0 (D-SUB9) of standard, the circuit order that some passage or certain several passages connection are sent out by computing machine by elder generation when work is passed through chip D0 to central processing unit CPU/MCU, after CPU (central processing unit) CPU/MCU receives order, order is resolved, can control this hyperchannel commutation circuit by industrial computer like this, the chip D0 that wherein connects serial port connector X0 and central processing unit CPU/MCU is that Transistor-Transistor Logic level transfers the chip of RS232 level to (such as MAX232, D1 also is the chip that Transistor-Transistor Logic level transfers the RS232 level to), the serial port connector X0 (D-SUB9) that can connect next piece hyperchannel commutation circuit with serial port connector X1 (D-SUB9), and then meet down the serial port connector X0 (D-SUB9) of next piece hyperchannel commutation circuit with the serial port connector X1 (D-SUB9) of next piece hyperchannel commutation circuit, so just can be always subsequent, until reach the passage number of handovers that needs, so can connect numerous relay switch passage.
If need to connect certain passage, central processing unit CPU/MCU will order that to be dealt into the chip Dn+1 of Darlington transistor or Dn+n by chip D2-Dn upper and drive relay, if next passage, that just continues order to be dealt on the plank that needs control by corresponding chip D2-Dn.
Claims (2)
1. can expand the measurement channel switching circuit for one kind, comprise a central processing unit CPU/MCU, it is characterized in that: central processing unit CPU/MCU several conversion chip D2-Dn that seal in and go out in parallel, each chip among the conversion chip D2-Dn respectively connects the chip of a Darlington transistor, the chip of each Darlington transistor connects respectively among the relay K 1-Kn, central processing unit CPU/MCU also connects respectively chip D0, the D1 that TTL turns 232 level, and chip D0 is connected with host computer by serial port connector X0.
2. a kind of measurement channel switching circuit of expanding according to claim 1, it is characterized in that: chip D0 is connected with host computer through serial port connector X0, serial port connector X1 connects the serial port connector X0 of next piece commutation circuit, and the serial port connector X1 of next piece commutation circuit meets the serial port connector X0 of next piece commutation circuit again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105215354A CN103019137A (en) | 2012-12-07 | 2012-12-07 | Extendable measurement channel switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105215354A CN103019137A (en) | 2012-12-07 | 2012-12-07 | Extendable measurement channel switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103019137A true CN103019137A (en) | 2013-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105215354A Pending CN103019137A (en) | 2012-12-07 | 2012-12-07 | Extendable measurement channel switching circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031999A (en) * | 2018-05-30 | 2018-12-18 | 浙江巨磁智能技术有限公司 | It can cascade channel switching system and its switching method |
| CN114676087A (en) * | 2022-05-30 | 2022-06-28 | 南京宏泰半导体科技有限公司 | Extended TTL communication device based on parallel port controller |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485363A (en) * | 1981-12-28 | 1984-11-27 | Gould, Inc. | Signal processor using surface acoustic waves |
| CN2667778Y (en) * | 2003-12-25 | 2004-12-29 | 刘海波 | Intelligent electric comprehensive monitoring device |
| CN1967279A (en) * | 2005-11-18 | 2007-05-23 | 北华大学 | Circuit for measuring synchronized sampler of flying capacitance |
| CN201335959Y (en) * | 2009-01-16 | 2009-10-28 | 武汉电信器件有限公司 | Multi-channel digital switch signal controller |
| CN102495554A (en) * | 2011-11-22 | 2012-06-13 | 苏州凌创电子科技有限公司 | Program controlled matrix switch and manufacturing method thereof |
| CN203149322U (en) * | 2012-12-07 | 2013-08-21 | 江苏嘉钰新能源技术有限公司 | Extendable measurement channel switching circuit |
-
2012
- 2012-12-07 CN CN2012105215354A patent/CN103019137A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485363A (en) * | 1981-12-28 | 1984-11-27 | Gould, Inc. | Signal processor using surface acoustic waves |
| CN2667778Y (en) * | 2003-12-25 | 2004-12-29 | 刘海波 | Intelligent electric comprehensive monitoring device |
| CN1967279A (en) * | 2005-11-18 | 2007-05-23 | 北华大学 | Circuit for measuring synchronized sampler of flying capacitance |
| CN201335959Y (en) * | 2009-01-16 | 2009-10-28 | 武汉电信器件有限公司 | Multi-channel digital switch signal controller |
| CN102495554A (en) * | 2011-11-22 | 2012-06-13 | 苏州凌创电子科技有限公司 | Program controlled matrix switch and manufacturing method thereof |
| CN203149322U (en) * | 2012-12-07 | 2013-08-21 | 江苏嘉钰新能源技术有限公司 | Extendable measurement channel switching circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031999A (en) * | 2018-05-30 | 2018-12-18 | 浙江巨磁智能技术有限公司 | It can cascade channel switching system and its switching method |
| CN114676087A (en) * | 2022-05-30 | 2022-06-28 | 南京宏泰半导体科技有限公司 | Extended TTL communication device based on parallel port controller |
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Application publication date: 20130403 |