CN202837425U - Low-power consumption direct-current electronic load - Google Patents
Low-power consumption direct-current electronic load Download PDFInfo
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- CN202837425U CN202837425U CN 201220420234 CN201220420234U CN202837425U CN 202837425 U CN202837425 U CN 202837425U CN 201220420234 CN201220420234 CN 201220420234 CN 201220420234 U CN201220420234 U CN 201220420234U CN 202837425 U CN202837425 U CN 202837425U
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Abstract
The utility model discloses a low-power consumption direct-current electronic load. The low-power consumption direct-current electronic load comprises a power drive circuit, a single-chip microcomputer with a built-in 12-bit A/D converter and a built-in D/A converter, a voltage sampling circuit and a current sampling circuit. Input ends of the voltage sampling circuit and the current sampling circuit are respectively connected with the power drive circuit; output ends of the voltage sampling circuit and the current sampling circuit are respectively connected into a channel of the built-in A/D converter of the single-chip microcomputer; the single-chip microcomputer presets voltage, current and resistance through software programming; a channel of the built-in D/A converter of the single-chip microcomputer is connected with signal input ends of a constant voltage circuit, a constant current circuit and a constant resistance circuit respectively; and signal output ends of the constant voltage circuit, the constant current circuit and the constant resistance circuit are respectively in control connection with the power drive circuit; the single-chip microcomputer is externally connected with an alarm circuit and a display circuit; and the single-chip microcomputer is in communication connection with an upper computer through a communication interface. The low-power consumption direct-current electronic load of the utility model has the advantages of low power consumption, good stability and high precision.
Description
Technical field
The utility model technology relates to a kind of resistive load, but relates in particular to the low power consumption DC electric load of constant current, constant-resistance, three kinds of mode operations of constant voltage.
Background technology
DC Electronic Loads is mainly simulated load or the electrical appliance that uses in the actual environment, be widely used in the quick test of communication DC power supply, Switching Power Supply, accumulator etc. charge and discharge process parameter, and the test of motor constant power type device load stability characteristic (quality) and transient response parameter.The electronic load of selecting to be fit to is important step during the research and development of power supply class are produced to power supply test.
Compare with traditional resistive load, it is little that DC Electronic Loads has its volume, and efficient is high, dependable performance, the advantage of energy-conserving and environment-protective.
The most DC Electronic Loads adopts three end adjustable reference voltage sources of accurate parallel connection type to replace stabilivolt, to satisfy in the test process strict demand to DC Electronic Loads constant voltage, constant current index, but its constant current value of DC load that this method consists of is non-adjustable, output current is narrower very among a small circle, and voltage is not wide.In addition, at present DC Electronic Loads still exists: the electronic load response speed is slow, and precision is not high, dynamic load power of test imperfection, the shortcoming such as stability and robustness are good not.
Summary of the invention
The utility model is larger for its power consumption of DC load of present existence, because adopting core control piece radiating effect undesirable, and less stable during the system long-time running, provide a kind of low in energy consumption, precision is high, and stability is strong, the low power consumption DC electric load of complete function.
The technical solution adopted in the utility model is:
The low power consumption DC electric load, include power driving circuit, it is characterized in that: the single-chip microcomputer that also includes built-in 12 A/D converters and D/A converter, voltage sampling circuit, current sampling circuit, voltage sampling circuit, the input end of current sampling circuit is connected with power driving circuit respectively, voltage sampling circuit, the output terminal of current sampling circuit accesses respectively the passage of the built-in A/D converter of single-chip microcomputer, single-chip microcomputer by software programming to voltage, electric current and resistance pre-set, the passage of the built-in D/A converter of single-chip microcomputer is connected with respectively constant voltage circuit, constant-current circuit, the signal input part of constant-resistance circuit, constant voltage circuit, constant-current circuit, the signal output part of constant-resistance circuit respectively with the power driving circuit control linkage, the external warning circuit of single-chip microcomputer, display circuit, single-chip microcomputer is connected with upper machine communication by communication interface.
The model of described single-chip microcomputer is C8051F120.
Described display circuit adopts 12864 liquid crystal display.
Described current sampling circuit adopts the CS005XL Hall element to detect electric current.
Also include power supply, power supply provides 12V voltage for voltage sampling circuit, current sampling circuit, for single-chip microcomputer provides 5V voltage.
The utility model adopts the high-performance of built-in 12 A/D, D/A, low-power scm C8051F120 to form system's control core, adopt 12864 liquid crystal display as mode of operation and the service data display screen of system, realize that by Software for Design system works is in deciding voltage, decide electric current, deciding three kinds of patterns of resistance.Adopt the CS005XL Hall element to detect electric current, feed back to single-chip microcomputer with the form of voltage, and then control D/A output, the current measurement precision improved.In addition, the utility function circuit design such as audible alarm circuit, display circuit have been added.
The utility model has the advantages that:
The utlity model has low-power consumption, good stability, the advantage that precision is high; Have high pressure (more than the 20V) and large electric current (more than the 3A) duty voice prompt function and Power Limitation (peak power 60W) mode of operation.
Description of drawings:
Fig. 1 is principle assumption diagram of the present utility model.
Fig. 2 is the software flow pattern of utility model.
Embodiment
Such as Fig. 1, shown in 2, the low power consumption DC electric load, include power driving circuit 2, also include the single-chip microcomputer 1 of built-in 12 A/D converters 3 and D/A converter 4, voltage sampling circuit 5, current sampling circuit 6, voltage sampling circuit 5, the input end of current sampling circuit 6 is connected with power driving circuit 2 respectively, voltage sampling circuit 5, the output terminal of current sampling circuit 6 accesses respectively the passage of single-chip microcomputer 1 built-in A/D converter 3, single-chip microcomputer 1 by software programming to voltage, electric current and resistance pre-set, the passage of single-chip microcomputer 1 built-in D/A converter 4 is connected with respectively constant voltage circuit 7, constant-current circuit 8, the signal input part of constant-resistance circuit 9, constant voltage circuit 7, constant-current circuit 8, the signal output part of transverse arrest circuit 9 respectively with power driving circuit 2 control linkages, single-chip microcomputer 1 external warning circuit 10, display circuit 11, single-chip microcomputer 1 is connected with host computer 13 communications by communication interface 12.
The model of single-chip microcomputer 1 is C8051F120.
Also include power supply 14, power supply 14 provides 12V voltage for voltage sampling circuit 5, current sampling circuit 6, for single-chip microcomputer 1 provides 5V voltage.
The core mainly adopts low-power scm C8051F120 as key control unit, and its inside comprises 12 A/D, D/A translation function, and degree of accuracy is high.Realize voltage, electric current and resistance are pre-seted by software programming, A/D samples relatively, D/A output, and LCD shows, crosses pressure-controlled, crosses the several functions such as current control and overpower control.
Power control is by the automatic gating constant voltage of core controller pilot relay C8051F120, constant current, three kinds of mode circuits of constant-resistance.Three kinds of mode circuit discrete design, constant voltage circuit adopts in-phase proportion amplifying circuit of TL082 operational amplifier design, exports by voltage sampling circuit again; Constant-current circuit adopts an in-phase proportion amplifying circuit access of TL082 operational amplifier design current detection circuit; Constant-resistance circuit adopts the operating circuit identical with constant-current circuit, the Ratio invariableness of Single-chip Controlling voltage and electric current.Simultaneously overvoltage, overcurrent, overpower protection circuit have been designed for three kinds of mode circuits.Wherein power tube adopts N channel enhancement metal-oxide-semiconductor IRF640 as power tube.Power MOS pipe has positive temperature coefficient (PTC), and on state resistance increases when junction temperature raises, and the self-limiting effect is arranged, and therefore adopts the native system thermal stability of power MOSFET design high.
Current sample is by the CS005XL Hall element current signal to be converted to voltage signal to feed back to the Single-chip Controlling element circuit; Voltage sample is to voltage input end, by proofreading and correct the voltage value of sampling at the adjustable semifixed resistor of output termination with the Voltage Feedback on the sampling resistor.
Show and adopt 12864 LCD to show, on same interface, show simultaneously the many kinds of parameters such as voltage, electric current, power, connect the control buzzer by the single-chip processor i/o mouth and finish warning function.
Through the WD10-220D12 switch power module, output ± 12V DC voltage is supplied with amplifier to system power supply after filtering and current sensor uses by alternating current 220V.+ 12V voltage is powered to single-chip microcomputer through three terminal regulator 7805 output+5V voltages.
Serial communication interface COM1 on the main control chip C8051F120 is connected with the COM1 on the PC, finish with host computer between communicate by letter, test data is written into host computer, realize monitoring function.
The system software Functional Design:
Low-power consumption Strong MCU C8051F120 is used in this design, and the circuit of composition can be realized following three functions, software flow as shown in Figure 2:
1. sampling output current, voltage and show at LCD.Single-chip microcomputer is sampled to the voltage and current of equivalent load by 12 A/D that inside carries, and send liquid crystal display to carry out the demonstration of voltage, electric current, real power after process single-chip microcomputer inside with gathering the numerical value of returning.
2. set constant voltage, constant current and constant-resistance operational mode and parameter.Give single-chip microcomputer by the keyboard to set up preset value, single-chip microcomputer carries D/A by inside and converts digital quantity to corresponding analog output, when electric current greater than 3A or voltage during greater than 20V, single-chip microcomputer will start overcurrent (overvoltage) prompting, hummer sends alerting signal.If power surpasses the peak power of setting, under constant voltage mode, just reduce so voltage, under constant current mode, just reduce electric current, simultaneously buzzer warning.
3. report to the police (greater than 20V, electric current is greater than 3A such as voltage, and power is greater than 50W) during greater than a certain numerical value when voltage, electric current or power, and chimes of doom becomes rapid along with the increase of numerical value.
Ipc monitor and Data Acquisition Design
The Serial Communication Program that adopted Matlab software and C language co-design, and monitoring interface are finished the functions such as setting parameter, data demonstration, data real time record.Data can be directly inputted among the Matlab, are convenient to the specificity analysis of further data and test component.
Claims (5)
1. low power consumption DC electric load, include power driving circuit, it is characterized in that: the single-chip microcomputer that also includes built-in 12 A/D converters and D/A converter, voltage sampling circuit, current sampling circuit, voltage sampling circuit, the input end of current sampling circuit is connected with power driving circuit respectively, voltage sampling circuit, the output terminal of current sampling circuit accesses respectively the passage of the built-in A/D converter of single-chip microcomputer, single-chip microcomputer by software programming to voltage, electric current and resistance pre-set, the passage of the built-in D/A converter of single-chip microcomputer is connected with respectively constant voltage circuit, constant-current circuit, the signal input part of transverse arrest circuit, constant voltage circuit, constant-current circuit, the signal output part of transverse arrest circuit respectively with the power driving circuit control linkage, the external warning circuit of single-chip microcomputer, display circuit, single-chip microcomputer is connected with upper machine communication by communication interface.
2. low power consumption DC electric load according to claim 1 is characterized in that: the model of described single-chip microcomputer is C8051F120.
3. according to low power consumption DC electric load claimed in claim 1, it is characterized in that: described display circuit adopts 12864 liquid crystal display.
4. according to low power consumption DC electric load claimed in claim 1, it is characterized in that: described current sampling circuit adopts the CS005XL Hall element to detect electric current.
5. according to low power consumption DC electric load claimed in claim 1, it is characterized in that: also include power supply, power supply provides 12V voltage for voltage sampling circuit, current sampling circuit, for single-chip microcomputer provides 5V voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220420234 CN202837425U (en) | 2012-08-23 | 2012-08-23 | Low-power consumption direct-current electronic load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220420234 CN202837425U (en) | 2012-08-23 | 2012-08-23 | Low-power consumption direct-current electronic load |
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| Publication Number | Publication Date |
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| CN202837425U true CN202837425U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220420234 Expired - Fee Related CN202837425U (en) | 2012-08-23 | 2012-08-23 | Low-power consumption direct-current electronic load |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344904A (en) * | 2013-06-13 | 2013-10-09 | 福建联迪商用设备有限公司 | Simulation lithium battery testing method and circuit for checking product charging circuit |
| CN103677048A (en) * | 2013-12-03 | 2014-03-26 | 京东方科技集团股份有限公司 | Drive circuit and electronic device |
| CN103792446A (en) * | 2014-01-17 | 2014-05-14 | 宁波大学 | Method for simulating discharge performance of battery and battery simulator applying same |
| CN104569855A (en) * | 2015-01-08 | 2015-04-29 | 珠海许继电气有限公司 | Automatic testing system for power supply |
| CN105425170A (en) * | 2015-12-09 | 2016-03-23 | 浙江榆阳电子有限公司 | Intelligent aged load |
| CN108762158A (en) * | 2018-06-11 | 2018-11-06 | 山东理工大学 | Efficient numerically controlled DC power supply and its test method based on the design of MSP430 microcontrollers |
| CN110007249A (en) * | 2019-03-19 | 2019-07-12 | 江苏理工学院 | A kind of LED light driving power test method, apparatus and system |
| CN110967548A (en) * | 2018-09-29 | 2020-04-07 | 株洲中车时代电气股份有限公司 | Program-controlled variable resistor device with current detection function and working method |
-
2012
- 2012-08-23 CN CN 201220420234 patent/CN202837425U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344904A (en) * | 2013-06-13 | 2013-10-09 | 福建联迪商用设备有限公司 | Simulation lithium battery testing method and circuit for checking product charging circuit |
| CN103344904B (en) * | 2013-06-13 | 2015-11-18 | 福建联迪商用设备有限公司 | A kind of for checking simulation lithium battery method of testing and the circuit of product charging circuit |
| CN103677048A (en) * | 2013-12-03 | 2014-03-26 | 京东方科技集团股份有限公司 | Drive circuit and electronic device |
| CN103677048B (en) * | 2013-12-03 | 2015-11-11 | 京东方科技集团股份有限公司 | A kind of driving circuit and electronic installation |
| CN103792446A (en) * | 2014-01-17 | 2014-05-14 | 宁波大学 | Method for simulating discharge performance of battery and battery simulator applying same |
| CN103792446B (en) * | 2014-01-17 | 2016-04-27 | 宁波大学 | A kind of method of simulated battery discharge performance and realize the battery simulator of the method |
| CN104569855A (en) * | 2015-01-08 | 2015-04-29 | 珠海许继电气有限公司 | Automatic testing system for power supply |
| CN105425170A (en) * | 2015-12-09 | 2016-03-23 | 浙江榆阳电子有限公司 | Intelligent aged load |
| CN108762158A (en) * | 2018-06-11 | 2018-11-06 | 山东理工大学 | Efficient numerically controlled DC power supply and its test method based on the design of MSP430 microcontrollers |
| CN110967548A (en) * | 2018-09-29 | 2020-04-07 | 株洲中车时代电气股份有限公司 | Program-controlled variable resistor device with current detection function and working method |
| CN110007249A (en) * | 2019-03-19 | 2019-07-12 | 江苏理工学院 | A kind of LED light driving power test method, apparatus and system |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20130823 |