CN103337323A - Simple and efficient programmable resistance board - Google Patents
Simple and efficient programmable resistance board Download PDFInfo
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- CN103337323A CN103337323A CN 201310307226 CN201310307226A CN103337323A CN 103337323 A CN103337323 A CN 103337323A CN 201310307226 CN201310307226 CN 201310307226 CN 201310307226 A CN201310307226 A CN 201310307226A CN 103337323 A CN103337323 A CN 103337323A
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Abstract
The invention discloses a simple and efficient programmable resistance board, which relates to the technical field of an electronic product. A USB (Universal Serial Bus) interface circuit (2) and a serial interface circuit (3) of the simple and efficient programmable resistance board are both connected with an MCU (Micro Controller Unit) circuit (4), the MCU circuit (4) is connected with a driving circuit (5) through an SPI (Serial Peripheral Interface) IN interface, the driving circuit (5) is respectively connected with an SPI OUT interface and a relay array (6), the relay array (6) is connected with a resistance array (7), and a power supply circuit (1) is connected with the USB interface circuit (2), the serial interface circuit (3), the MCU circuit (4), the driving circuit (5), the relay array (6) and the resistance array (7). Compared with a traditional PCI (Peripheral Component Interconnect) or PXI (PCI Extensions for Instrumentation) bus, the simple and efficient programmable resistance board disclosed by the invention has the advantages that the structure is simple, the weight is light, the size is small, independent use or cascade extension can be carried out, and the like.
Description
Technical field:
The present invention relates to technical field of electronic products, be specifically related to a kind of based on serial ports and USB mouth programmable resistance plate.
Background technology:
Existing programmable resistance plate majority is based on pci bus or PXI bus, and resistance is customization, and instructions for use is higher, and particularly for automotive electronics, its analog input amount is a lot, mostly is the adjustable resistance input, and the input excursion is very wide.Existing integrated circuit board mostly is the two-way adjustable resistance, for satisfying the testing requirement needs polylith adjustable electric baffle-wall is installed, this not only increases expense, and requires computer or PXI trough that enough slots must be arranged, increase redundancy overhead for building a complete test macro, very inconvenient.
In addition existing integrated circuit board resistance is customization, the resistance specification does not satisfy standard resistance table E-96 requirement, in case occur damaging, the device that can't buy same specification is from the market changed, integrated circuit board must be returned former manufacturer, not only maintenance cost height, and time is longer, be unfavorable for producing research and development response requirement fast.
Summary of the invention:
The purpose of this invention is to provide a kind of simple efficient programmable resistance plate, it is compared with traditional PCI or PXI bus, has simple in structurely, in light weight, and volume is little, can use separately or advantage such as cascade expansion.
In order to solve the existing problem of background technology, the present invention is by the following technical solutions: it comprises power circuit 1, usb circuit 2, serial port circuit 3, MCU circuit 4, drive circuit 5, relay array 6 and electric resistance array 7, usb circuit 2, serial port circuit 3 all is connected with MCU circuit 4, MCU circuit 4 is connected with drive circuit 5 by SPI IN interface, drive circuit 5 respectively with SPI OUT interface, relay array 6 connects, relay array 6 is connected with electric resistance array 7, power circuit 1 and usb circuit 2, serial port circuit 3, MCU circuit 4, drive circuit 5, relay array 6 and electric resistance array 7 are connected to its power supply.
Described drive circuit 5 adopts Darlington transistor ULN2803 to improve the promotion ability, plays the circuit buffer action simultaneously, and the inverse electromotive force that TVS pipe elimination relay produced in the moment of outage is influential to other elements.Under the condition that does not increase any I/O mouth, by the mode of cascade, way is controlled in expansion by 74HC595.At present at most can eight same integrated circuit boards of cascade, realize that 16 road programmable resistances export simultaneously.
Described electric resistance array 7 adopts the precision resistance of 1% precision, by rational coupling, has both satisfied standard resistance table E-96 requirement, avoids customizing separately special requirement resistance, increases cost, satisfies the resistance calculations formula simultaneously.
Whole system of the present invention is by Single-chip Controlling, and realization is mutual with host computer, controls drive circuit works simultaneously.By the spi bus expansion, generate the spi bus control command by resolving simultaneously, drive relay work, insert or skip each resistance, combination obtains set point, supports the cascade of multichannel integrated circuit board.By computer programming, can control any paths fast, response is rapidly.
The present invention has following beneficial effect:
1, can use separately, not need to increase PCI or PXI slot expense.
2, excursion is wide, satisfies the requirement of most occasions.
3, can cascade use, support eight integrated circuit board cascades at most, provide up to 16 tunnel outputs.
4, selected device is commonly used, need not customization, and low cost is easy to maintenance, dependable performance.
Description of drawings:
Fig. 1 is structural representation of the present invention,
Fig. 2 is workflow diagram of the present invention.
Embodiment:
With reference to Fig. 1-Fig. 2, this embodiment is by the following technical solutions: it comprises power circuit l, usb circuit 2, serial port circuit 3, MCU circuit 4, drive circuit team relay array 6 and electric resistance array 7, usb circuit 2, serial port circuit 3 all is connected with MCU circuit 4, MCU circuit 4 is connected with drive circuit 5 by the SPIIN interface, drive circuit 5 respectively with the SPIOUT interface, relay array 6 connects, relay array 6 is connected with electric resistance array 7, on the power circuit with usb circuit 2, serial port circuit 3, MCU circuit 4, drive circuit team relay array 6 and electric resistance array 7 are connected to its power supply.
Described drive circuit 5 adopts Darlington transistor ULN2803 to improve the promotion ability, plays the circuit buffer action simultaneously, and the inverse electromotive force that TVS pipe elimination relay produced in the moment of outage is influential to other elements.Not increasing under any 1/0 mouthful condition, by the mode of cascade, way is controlled in expansion by 74HC595.At present at most can eight same integrated circuit boards of cascade, realize that 16 road programmable resistances export simultaneously.
Described electric resistance array 7 adopts the precision resistance of M precision, by rational coupling, has both satisfied mark Huaihe River resistance table E-96 requirement, avoids customizing separately special requirement resistance, increases cost, satisfies the resistance calculations formula simultaneously:
The requirement of R=x1*1+x2*2+x3*4+x4*8+x5*16+x6*32+x7*64+x8*128+X9*256+x1 0*512+x11*1024+x12*2000+x13*4000+x14*8000+x15*16000+x16* 32000.Its resistance value is as follows: R1=0.5ohm, R2=0.5ohm, R5=lohm, R6=1ohm, R9=2ohm, R10=2ohm, R13=3.01ohm, R14=4.9gohm, R17=14ohm, R18=2ohm, R21=15.8ohm, R22=16.2ohm, R25=31.6ohm, R26=32.4ohm, R29=63.4ohm, R30=64.9ohm, R33=113ohm, R34=143ohm, R37=232ohm, R38=280ohm, R41=475ohm, R42=549ohm, R45=lKohm, R46=1Kohm, R49=2Kohm, R50=2Kohm, R53=3.0lohm, R54=4.9gohm, R57=7.32kohm, R58=8.68kohm, R61=15.8Kohm, R62=16.2Kohm, R65=31.6ohm, R66=32.4ohm.
This embodiment whole system is by Single-chip Controlling, and realization is mutual with host computer, controls drive circuit works simultaneously.By the spi bus expansion, generate the spi bus control command by resolving simultaneously, drive relay work, insert or skip each resistance, combination obtains set point, supports the cascade of multichannel integrated circuit board.By computer programming, can control any paths fast, response is rapidly.
This embodiment is compared with traditional PCI or PXI bus, has simple in structurely, in light weight, and volume is little, can use separately or advantage such as cascade expansion.
More than disclosed be specific embodiments of the invention only, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop in protection scope of the present invention.
Claims (2)
1. simple efficient programmable resistance plate, it is characterized in that it comprises power circuit (1), usb circuit (2), serial port circuit (3), MCU circuit (4), drive circuit (5), relay array (6) and electric resistance array (7), usb circuit (2), serial port circuit (3) all is connected with MCU circuit (4), MCU circuit (4) is connected with drive circuit (5) by SPI IN interface, drive circuit (5) respectively with SPI OUT interface, relay array (6) connects, relay array (6) is connected with electric resistance array (7), power circuit (1) and usb circuit (2), serial port circuit (3), MCU circuit (4), drive circuit (5), relay array (6) is connected with electric resistance array (7).
2. a kind of simple efficient programmable resistance plate according to claim 1 is characterized in that described electric resistance array (7) adopts the precision resistance of 1% precision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310307226 CN103337323A (en) | 2013-07-19 | 2013-07-19 | Simple and efficient programmable resistance board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310307226 CN103337323A (en) | 2013-07-19 | 2013-07-19 | Simple and efficient programmable resistance board |
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| CN103337323A true CN103337323A (en) | 2013-10-02 |
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| CN 201310307226 Pending CN103337323A (en) | 2013-07-19 | 2013-07-19 | Simple and efficient programmable resistance board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926853A (en) * | 2014-04-21 | 2014-07-16 | 株洲南车时代电气股份有限公司 | Programmable resistance output device and method |
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2013
- 2013-07-19 CN CN 201310307226 patent/CN103337323A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926853A (en) * | 2014-04-21 | 2014-07-16 | 株洲南车时代电气股份有限公司 | Programmable resistance output device and method |
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Application publication date: 20131002 |