CN103954812B - Multichannel precise direct-current voltage source - Google Patents
Multichannel precise direct-current voltage source Download PDFInfo
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- CN103954812B CN103954812B CN201410166925.3A CN201410166925A CN103954812B CN 103954812 B CN103954812 B CN 103954812B CN 201410166925 A CN201410166925 A CN 201410166925A CN 103954812 B CN103954812 B CN 103954812B
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Abstract
The invention discloses a multichannel precise direct-current voltage source. A master controller is connected with a keyboard, a liquid crystal display screen, a communication interface and an expansion interface A. The expansion interface A is connected with an expansion interface B. A switching power supply is connected with the master controller, the liquid crystal display screen, the expansion interface A, a sub-controller and the input end of a mutual inductance choking coil. The sub-controller is connected with the input end of the mutual inductance choking coil, an output synchronous interface and the expansion interface B. The output end of the mutual inductance choking coil is connected with the digital end of a multichannel precise digital-to-analogue conversion circuit and a linear power supply A. The linear power supply A is connected with the digital end of the multichannel precise digital-to-analogue conversion circuit. A linear power supply B is connected with the analog end of the multichannel precise digital-to-analogue conversion circuit and a reference voltage circuit. The reference voltage circuit is connected with the analog end of the multichannel precise digital-to-analogue conversion circuit. An input voltage control module is connected with the switching power supply, the linear power supply A and the linear power supply B. The multichannel precise direct-current voltage source is suitable for the scientific research field or industrial production tests with high requirements for the number of channels and precision.
Description
Technical field
The invention belongs to voltage-stabilized power supply technical field, particularly to a kind of multichannel precision direct voltage source.
Background technology
Precision voltage source is a kind of equipment providing precise and stable DC voltage, is widely used in laboratory and work
In industry.Its modal purposes is Measurement of Semiconductors and provides grid voltage to metal-oxide-semiconductor.Measurement of Semiconductors needs to obtain accurately
U-I curve, and common dc source meets requirement because resolution ratio is too low and very difficult.It is frequently necessary to MOS in commercial Application
Pipe provides different grid voltages to change its conducting resistance, in order to realize the continuous adjustability of conducting resistance it is necessary to one group
Continuously adjustable voltage, precision voltage source fine can must meet requirement due to the characteristic of its high-resolution and PLC technology.
With deepening continuously of industrial production and scientific research, the resolution ratio of high precision electro potential source and stability also face more
Carry out higher requirement, such as, within some advanced semiconductor performance tests require that resolution ratio reaches 100 μ V, require shake simultaneously
Less than 40 μ V, and wish that port number is as many as possible；With scientific and technological progress, this trend is gradually aggravated.Due to existing
Precision voltage source resolution ratio is too low, or port number is less, and current solution is using the combination of multiple stage voltage source mostly
Mode, to process, necessarily improves cost and reduces testing efficiency.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of multichannel precision direct voltage source.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is：Multichannel precision direct voltage source, including
Main control module, modular converter and input power control module；Main control module includes Switching Power Supply, master controller, keyboard, liquid crystal
Screen, communication interface and expansion interface A；Modular converter includes linear power supply A, linear power supply B, sub-controller, unichoke, many
Road precision D/A converting circuit, reference voltage circuit, accurate voltage output interface, output sync cap and expansion interface B；
Master controller is connected with keyboard, liquid crystal display, communication interface, expansion interface A；
Expansion interface A is connected with expansion interface B, and master controller carries out SPI communication with sub-controller；
Switching Power Supply is connected with the input of master controller, liquid crystal display, expansion interface A, sub-controller, unichoke；
The input of sub-controller and unichoke, output sync cap, expansion interface B are connected；
The output end of unichoke is connected with the digital end of multichannel precision D/A converting circuit, linear power supply A；
Linear power supply A is connected with the digital end of multichannel precision D/A converting circuit respectively；
Linear power supply B is connected with the analog end of multichannel precision D/A converting circuit, reference voltage circuit respectively；
Reference voltage circuit is connected with the analog end of multichannel precision D/A converting circuit respectively；
Input power control module is connected with Switching Power Supply, linear power supply A, linear power supply B；
The input voltage of input power control module is AC 85V～264V/47～63Hz, input power control module
Output includes two groups of mutually isolated direct voltage outputs, and its output order is controllable.
Preferably, communication interface is GPIB, Ethernet interface, one or more of USB2.0, RS232.
Preferably, modular converter is cascaded with expansion interface A by expansion interface B, thus extended channel number.
Preferably, multichannel precision D/A converting circuit includes high precision digital-to-analog converter and buffer circuit, reference voltage
Circuit output is connected using Kelvin four line with high precision digital-to-analog converter, through one after high precision digital-to-analog converter simulation output
Level operational amplifier buffers obtain accurate voltage output.
Preferably, reference voltage circuit is +/- 10V reference voltage source.
The invention has the beneficial effects as follows：
Using multi-disc high precision digital-to-analog converter realize multichannel output, and D/A converting circuit be directly realized-
Accurate voltage output, conditioning that need not be loaded down with trivial details and the filter circuit of 10V-10V；Using unichoke fully achieve digital-to-analogue every
From effectively solving the contradiction of digital circuit high-speed transfer and analog circuit low noise requirement；Duplex high precision digital-to-analogue conversion
Circuit digital part and analog portion one point earth, it is to avoid from analog portion backflow, effectively solve big digital current to mould
Intend the interference of circuit；Main control module and modular converter with expansion interface, be conducive to user's extended channel number；User interface with
Communication interface is varied, except locally adjustable, can also realize computer long-distance control and automatic test.The therefore present invention
Can be applied in the field of scientific study higher to port number and precise requirements or industrial production test.
Brief description
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is the schematic block circuit diagram of multichannel precision direct voltage source embodiment of the present invention.
Fig. 2 is the accurate D/A converting circuit schematic diagram of multichannel precision direct voltage source embodiment of the present invention.
Fig. 3 is the software flow pattern of multichannel precision direct voltage source embodiment of the present invention.
Specific embodiment
Fig. 1 is a kind of 8 passage precision DC voltage sources, by main control module, modular converter and input power control module group
Become.
Main control module is made up of Switching Power Supply, master controller, keyboard, liquid crystal display, communication interface and expansion interface A.
Modular converter is by linear power supply A, linear power supply B, sub-controller, unichoke, 8 tunnel precision digital-to-analogue conversion electricity
Road, reference voltage circuit, accurate voltage output interface, output sync cap and expansion interface B composition.
Master controller is connected with keyboard, liquid crystal display, communication interface, expansion interface A.
Switching Power Supply is connected with the input of master controller, liquid crystal display, expansion interface A, sub-controller, unichoke.
The input of sub-controller and unichoke, output sync cap, expansion interface B are connected.
Expansion interface A is connected with expansion interface B.
Unichoke output end is connected with the digital end of 8 tunnel precision D/A converting circuits, linear power supply A respectively.
Linear power supply A is connected with the digital end of 8 tunnel precision D/A converting circuits respectively.
Linear power supply B is connected with the analog end of 8 tunnel precision D/A converting circuits, reference voltage circuit respectively.
Reference voltage circuit is connected with the analog end of accurate D/A converting circuit.
Input power control module is connected with Switching Power Supply, linear power supply A, linear power supply B.
In foregoing circuit, master controller and sub-controller are all using STM32 processor.
Expansion interface A and expansion interface B can be commonly to arrange seat, is connected by single line.
Linear power supply adopts low signal-to-noise ratio ADM7150 power supply chip.
Switching Power Supply adopts AMS1117 power supply chip.
In the present embodiment, the input voltage of input power control module is AC 85～264V, output include two groups stablize straight
Stream output, and control electric sequence.Input power control module two-way output analog power +/- 18V and digital power 5V, adopt
With completely isolated connected mode, analog power+18V is divided into A+15V, AD+3.3V on voltage plate after DC-DC circuit；-
18V is changed into -15V after DC-DC circuit.Wherein ,+15V, -15V supply analog device；AD+3.3V supplies the digital section of DAC
Point and the side that is connected with DAC of unichoke.Digital power 5V is divided into+3.3V on circuit boards after power supply circuits,
Supply digital circuits section.
Communication interface in main control module, can be GPIB, Ethernet interface, one or more of USB2.0, RS232.
Liquid crystal display can select any one in LCD screen, touch screens, capacitance plate.
The present embodiment using 8 tunnels precision digital-to-analogue conversions and has the accurate voltage output interface of 8 passages, by expansion interface
A can cascade 2 pieces and above modular converter, has 16 passages or 24 passages or 32 passage accurate voltage output interfaces.
Specifically accurate D/A converting circuit is as shown in Fig. 2 accurate digital to analog converter adopts the integrated electricity of 20bits DAC1220
Road.Digital to analog converter reference voltage adopts Kelvin four line connection, and digital to analog converter output is delayed through low noise operational amplifier
Punching obtains accurate voltage output, and high precision digital-to-analog converter conversion accuracy is up to 1ppm.
Unichoke is used for electric isolation to main controller and D/A converting circuit, including but not limited to signal every
From with the isolation to earth terminal.
Communication interface due to the present embodiment main control module enriches, and is capable of the communication with computer and automatically controls.
In the present embodiment, master controller can accept the instruction and data of host computer, and then modular converter completes to operate accordingly, energy
Enough realize the communication and computer between and automatically control.
The present embodiment operation principle：
As shown in figure 3, the system adopts master-slave controller to cooperate, sub-controller controls duplex high precision to the present embodiment flow process
The mode of digital to analog converter completes a kind of design of multichannel precision voltage source.Voltage signal be by user pass through computer or
Input through keyboard read-write voltage commands pass to master controller, and master controller decodes through one-level after receiving user profile and updates LCD
Display, and it is transferred to sub-controller, sub-controller carries out two grades of corresponding passages decoding and mating to the order sent, and will solve
Data after code and synchronizing signal are input simultaneously in modular converter, after digital to analog converter directly exports, delay through one-level amplifier
Punching obtains final output.
Invention described above embodiment, does not constitute limiting the scope of the present invention.Any in the present invention
Spirit and principle within modification, equivalent and improvement of being made etc., should be included in the claim protection model of the present invention
Within enclosing.
Claims (5)
1. multichannel precision direct voltage source it is characterised in that：Control mould including main control module, modular converter and input power
Block；Described main control module includes Switching Power Supply, master controller, keyboard, liquid crystal display, communication interface and expansion interface A；Described conversion
Module includes linear power supply A, linear power supply B, sub-controller, unichoke, multichannel precision D/A converting circuit, reference voltage
Circuit, accurate voltage output interface, output sync cap and expansion interface B；
Described master controller is connected with keyboard, liquid crystal display, communication interface, expansion interface A；
Described expansion interface A is connected with expansion interface B, and master controller carries out SPI communication with sub-controller；
Described Switching Power Supply is connected with the input of master controller, liquid crystal display, expansion interface A, sub-controller, unichoke；
The input of described sub-controller and unichoke, output sync cap, expansion interface B are connected；
The output end of described unichoke is connected with the digital end of multichannel precision D/A converting circuit, linear power supply A；
Described linear power supply A is connected with the digital end of multichannel precision D/A converting circuit respectively；
Described linear power supply B is connected with the analog end of multichannel precision D/A converting circuit, reference voltage circuit respectively；
Described reference voltage circuit is connected with the analog end of multichannel precision D/A converting circuit respectively；
Described input power control module is connected with Switching Power Supply, linear power supply A, linear power supply B；
The input voltage of described input power control module is AC 85V～264V/47～63Hz, input power control module
Output includes two groups of mutually isolated direct voltage outputs, and its output order is controllable.
2. multichannel precision direct voltage source according to claim 1 it is characterised in that：Described communication interface be GPIB,
Ethernet interface, one or more of USB2.0, RS232.
3. multichannel precision direct voltage source according to claim 1 it is characterised in that：Described modular converter passes through extension
Interface B is cascaded with expansion interface A, thus extended channel number.
4. multichannel precision direct voltage source according to claim 1 it is characterised in that：Described multichannel precision digital-to-analogue conversion
Circuit includes high precision digital-to-analog converter and buffer circuit, and described reference voltage circuit output is adopted with high precision digital-to-analog converter
Kelvin four line connects, and obtains accurate voltage through one-level operational amplifier buffers defeated after high precision digital-to-analog converter simulation output
Go out.
5. multichannel precision direct voltage source according to claim 1 it is characterised in that：Described reference voltage circuit is
+/- 10V reference voltage source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410166925.3A CN103954812B (en) | 2014-04-23 | 2014-04-23 | Multichannel precise direct-current voltage source |
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| CN201410166925.3A CN103954812B (en) | 2014-04-23 | 2014-04-23 | Multichannel precise direct-current voltage source |
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| CN103954812A CN103954812A (en) | 2014-07-30 |
| CN103954812B true CN103954812B (en) | 2017-02-15 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203949947U (en) * | 2014-04-23 | 2014-11-19 | 合肥埃科光电科技有限公司 | Multichannel precision direct voltage source |
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| DE20008414U1 (en) * | 2000-05-11 | 2001-09-13 | Cameron Gmbh | Actuator |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203949947U (en) * | 2014-04-23 | 2014-11-19 | 合肥埃科光电科技有限公司 | Multichannel precision direct voltage source |
Non-Patent Citations (3)
| Title |
|---|
| 一种多输出直流稳压电源的设计;殷红彩 等;《传感器世界》;20060930;第22-25页 * |
| 基于ARM和CPLD的直流稳压电源设计;赵晓;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20130215;C042-138页 * |
| 多输出直流稳压电源设计;李宁 等;《平顶山学院学报》;20131031;第28卷(第5期);第51-53、60页 * |
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Address after: 230088 Building 1, yizhi science and Technology Industrial Park, No. 388, Yanzihe Road, Hefei, Anhui Patentee after: Hefei Eko Photoelectric Technology Co.,Ltd. Address before: 230000 room c513, University Science Park, 602 Huangshan Road, high tech Zone, Hefei, Anhui Patentee before: HEFEI ITEK PHOTOELECTRICS TECHNOLOGY CO.,LTD. |