CN202057776U - Passive liquid crystal display (LCD) constant-current electronic load - Google Patents
Passive liquid crystal display (LCD) constant-current electronic load Download PDFInfo
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- CN202057776U CN202057776U CN 201120121214 CN201120121214U CN202057776U CN 202057776 U CN202057776 U CN 202057776U CN 201120121214 CN201120121214 CN 201120121214 CN 201120121214 U CN201120121214 U CN 201120121214U CN 202057776 U CN202057776 U CN 202057776U
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- chip microcomputer
- electronic load
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Abstract
The utility model discloses a passive liquid crystal display (LCD) constant-current electronic load, which comprises a single-chip microcomputer, a direct-current voltage stabilizing circuit, a digital-to-analog (D/A) conversion circuit, a constant-current discharging circuit, a battery management chip, an LCD module and a resistor, wherein the single-chip microcomputer is connected with the anode of a testing power supply through a direct-current voltage-stabilized power supply, the constant-current discharging circuit and the resistor are serially connected between the anode and the cathode of the testing power supply, and the constant-current discharging circuit is controlled by the single-chip microcomputer through the D/A conversion circuit which transmits signals; the battery management chip detects the voltage of the two ends of the resistor, is controlled by the single-chip microcomputer and transmits signals to the single-chip microcomputer; and the single-chip microcomputer controls the LCD module to display. The passive LCD constant-current electronic load has the advantages of ingenious design, convenience in use, comprehensive testing function, high adaptability and protected testing power supply.
Description
Technical field
The utility model relates to the power supply test circuit field, and especially a kind of Passive LC D shows the constant current electronic load.
Background technology
Power supply is the functional part of various consumers, and the energy source of each parts in the consumer all is to rely on power supply, and it is to guarantee the most basic prerequisite of consumer normal operation.Therefore can the quality of power supply directly affect consumer and normally move, and all needs every running parameter of power supply is tested in processes such as the research and development of consumer, production, detection; And existing power supply testing device test function is comparatively single, and the then complex structure of complete function, cost are higher.
Summary of the invention
In order to overcome above-mentioned defective, the utility model provides a kind of Passive LC D to show the constant current electronic load, and is simple in structure, cost is low, test function is many.
The utility model for the technical scheme that solves its technical matters and adopt is: a kind of Passive LC D shows the constant current electronic load, comprises single-chip microcomputer, direct current regulation circuit, D/A change-over circuit, constant-current discharge circuit, battery management chip, LCD display module and resistance; Single-chip microcomputer connects the positive pole of testing power supply by D.C. regulated power supply, constant-current discharge circuit and resistance string are associated between the positive and negative electrode of testing power supply, this constant-current discharge circuit by single-chip microcomputer by the control of delivering a letter of D/A change-over circuit, described battery management chip detecting resistance both end voltage, this battery management chip is subjected to Single-chip Controlling and is messaging in single-chip microcomputer, described Single-chip Controlling LCD display module demonstration work.
As further improvement of the utility model, described electronic load also includes the temperature detecting module, and this temperature detecting module is detected power supply temperature to be measured and is messaging in single-chip microcomputer.
As further improvement of the utility model, described temperature detecting module is for adopting the temperature sensor of NTC thermistor.
As further improvement of the utility model, described electronic load also includes storage chip, data communication between this storage chip and the single-chip microcomputer.
As further improvement of the utility model, described electronic load also includes the control button, this control button connection single-chip microcomputer of delivering a letter.
As further improvement of the utility model, described electronic load also includes the LED light group, and this LED light group is worked by Single-chip Controlling.
As further improvement of the utility model, described LED light group is by the discharge pilot lamp and stop pilot lamp and form, described discharge pilot lamp with stop pilot lamp and worked by Single-chip Controlling, this discharge pilot lamp with stop the pilot lamp that pilot lamp is a different colours.
As further improvement of the utility model, described discharge pilot lamp is some green LED lamp; The described pilot lamp that stops is a red LED lamp.
As further improvement of the utility model, described constant-current discharge circuit is mainly connected to form by operational amplifier, discharge resistance and pliotron, described pliotron connects the positive pole and the discharge resistance of described power supply to be measured, discharge resistance connects described resistance, this pliotron is by the output terminal output control of operational amplifier, the in-phase input end of described operational amplifier connects described D/A change-over circuit, and the reverse input end of this operational amplifier is connected between pliotron and the discharge resistance and constitutes negative feedback.
As further improvement of the utility model, the collector of described pliotron connects the positive pole of power supply to be measured, and its emitter connects discharge resistance, and the output terminal of its base stage concatenation operation amplifier.
The beneficial effects of the utility model are: provide the electricity consumption of electronic load by testing power supply by direct current regulation circuit, need not other distribution source, design is light and handy, the convenient use; Realize voltage, capacity detecting by battery management chip, determine discharge current by the constant-current discharge circuit, realize temperature detecting by the temperature detecting module, handled by Single-chip Controlling, test function is comprehensive; Show test data by the LCD display module, and can derive test data by storage chip; Cooperate the LCD display module to carry out parameter setting to single-chip microcomputer by the control key groups, easy to operate, adaptability is strong; The constant-current discharge circuit is by Single-chip Controlling work, and single-chip microcomputer was put dot circuit control discharge by constant current and stopped the protection testing power supply when temperature was too high.
Description of drawings
Fig. 1 is the utility model circuit theory synoptic diagram;
Fig. 2 is the simple diagram of the utility model constant-current discharge circuit.
Embodiment
Below with reference to Fig. 1 embodiment of the present utility model is elaborated.
Fig. 1 is the utility model circuit theory synoptic diagram, Passive LC D of the present utility model shows the constant current electronic load, comprises single-chip microcomputer 1, direct current regulation circuit 2, D/A change-over circuit 3, constant-current discharge circuit 4, battery management chip 5, LCD display module 6 and resistance R S; Single-chip microcomputer 1 connects the positive pole of testing power supply by D.C. regulated power supply 2, constant-current discharge circuit 4 and resistance R S are connected between the positive and negative electrode of testing power supply, this constant-current discharge circuit 4 by single-chip microcomputer 1 by D/A change-over circuit 3 control of delivering a letter, described battery management chip 5 detecting resistance R S both end voltage, this battery management chip 5 is subjected to single-chip microcomputer 1 control and is messaging in single-chip microcomputer 1, the 6 demonstration work of described single-chip microcomputer 1 control LCD display module.
In the present embodiment, Passive LC D shows that the constant current electronic load also includes temperature detecting module 7, and these temperature detecting module 7 detecting power supply temperature to be measured also are messaging in single-chip microcomputer 1.
Described temperature detecting module 7 is for adopting the temperature sensor of NTC thermistor.
In the present embodiment, described electronic load also includes storage chip 8, data communication between this storage chip 8 and the single-chip microcomputer 1.Described electronic load also includes control button 9, and this control button 9 is delivered a letter and connected single-chip microcomputer 1.Described electronic load also includes LED light group 10, this LED light group 10 is subjected to single-chip microcomputer 1 Control work, by the discharge pilot lamp with stop pilot lamp and form, described discharge pilot lamp with stop pilot lamp and worked by Single-chip Controlling, this discharge pilot lamp and stop the pilot lamp that pilot lamp is a different colours, the discharge pilot lamp is some green LED lamp, and stopping pilot lamp is a red LED lamp.
In the present embodiment, described constant-current discharge circuit 4 is mainly connected to form by operational amplifier U1B, discharge resistance and pliotron Q1, described pliotron Q1 connects the positive pole and the discharge resistance of described power supply to be measured, discharge resistance connects described resistance R S, this pliotron Q1 is by the output terminal output control of operational amplifier U1B, the in-phase input end of described operational amplifier U1B connects described D/A change-over circuit 3, and the reverse input end of this operational amplifier U1B is connected between pliotron Q1 and the discharge resistance and constitutes negative feedback.
The collector of described pliotron Q1 connects the positive pole of power supply to be measured, and its emitter connects discharge resistance, and the output terminal of its base stage concatenation operation amplifier U1B.
The main electrical parameter of present embodiment is as follows:
| Project | Code name | Specification |
| 1. maximum discharge current | I D | 20A |
| 2. peak power | P M | 300W |
| 3. voltage range | V C | 5～30V |
| 4. the work power consumption is flowed | I C | Less than 10mA |
| 5. working environment | T E | Temperature :-20～+ 80 ℃ of humidity: be lower than 85%RH |
Major function of the present utility model and principle are as follows
1. power supply supply: this product dispense with outer connecting power, directly to power by testing power supply, testing power supply is directly given single-chip microcomputer, D/A converter, LCD display module, power supplies such as storage chip by direct current regulation circuit.
2. constant-current discharge circuit: by operational amplifier, the negative feedback circuit, discharge resistance, pliotron are formed the constant-current discharge circuit, by adjusting the operational amplifier voltage of input end in the same way, are made as Vin, determine discharge current.Electric current computing formula: I=Vin/R; Vin voltage converts simulating signal control by the digital signal of single-chip microcomputer to by the D/A change-over circuit.
3. detecting voltage: single-chip microcomputer sends instruction to battery management chip, and battery management chip is gathered voltage signal and A/D and is converted to digital signal and is stored in the corresponding registers, and single-chip microcomputer passes through I
2The C communications protocol reads battery management chip associated voltage data, by calculating conversion, sends data to the LCD display module again, shows actual voltage value.
4. temperature detecting: the temperature detecting module adopts NTC thermistor detecting temperature, and the resistance of NTC thermistor is proportional increase along with the rising of temperature; Temperature detecting module transmission temperature data is in single-chip microcomputer, and single-chip microcomputer sends data to the LCD display module by calculating conversion, shows actual temperature value.
5. temperature protection: because it is too high to put the point source temperature, surpass the temperature protection setting value, single-chip microcomputer stops by constant-current discharge circuit control discharge, the protection testing power supply.
6. capacity detecting: during discharge, battery management chip is according to discharge current and calculate discharge capacity discharge time, and capacity formula: C=I*t regularly upgrades the discharge capacity data, and single-chip microcomputer passes through I
2The C communications protocol reads battery management chip associated capacity data, by calculating conversion, sends data to the LCD display module again, shows the actual discharge capacity.
7.LCD show: single-chip microcomputer transmission data are given LCD display module, LCD display module display voltage, electric current, discharge capacity, temperature, data such as discharge time.
8. parameter setting: press key and the LCD display module cooperates by control, set discharge current, discharge time, discharge and end parameters such as pressure, supplemental characteristic deposits in the single-chip microcomputer related memory cell, is controlled by the single-chip microcomputer robotization.
9. data storage: single-chip microcomputer was sent to voltage, temperature, electric current, discharge capacity data in the storage chip at interval in 10 seconds, and after discharge finished, available relevant tool software read these data, does discharge curve or tables of data etc.
10.LED indication: by Single-chip Controlling, the green LED lamp circulation is lighted during discharge, and when discharge stopped, red light LED lamp was lighted.
The major advantage of present embodiment is: need not power supply, design is light and handy, the convenient use; Belt current, voltage, temperature and capacity show; Can derive sparking voltage, capacity, electric current and temperature data; Can set discharge current, discharge time and discharge cut-off voltage; The band temperature protection function.
Claims (10)
1. a Passive LC D shows the constant current electronic load, it is characterized in that: comprise single-chip microcomputer (1), direct current regulation circuit (2), D/A change-over circuit (3), constant-current discharge circuit (4), battery management chip (5), LCD display module (6) and resistance (RS); Single-chip microcomputer (1) connects the positive pole of testing power supply by D.C. regulated power supply (2), constant-current discharge circuit (4) and resistance (RS) are connected between the positive and negative electrode of testing power supply, described constant-current discharge circuit (4) by single-chip microcomputer (1) by D/A change-over circuit (3) control of delivering a letter, described battery management chip (5) detecting resistance (RS) both end voltage, this battery management chip (5) is subjected to single-chip microcomputer (1) to control and be messaging in single-chip microcomputer (1), the demonstration work of described single-chip microcomputer (1) control LCD display module (6).
2. Passive LC D according to claim 1 shows the constant current electronic load, and it is characterized in that: described electronic load also includes temperature detecting module (7), and this temperature detecting module (7) detecting power supply temperature to be measured also is messaging in single-chip microcomputer (1).
3. Passive LC D according to claim 2 shows the constant current electronic load, it is characterized in that: described temperature detecting module (7) is for adopting the temperature sensor of NTC thermistor.
4. Passive LC D according to claim 1 shows the constant current electronic load, and it is characterized in that: described electronic load also includes storage chip (8), data communication between this storage chip (8) and the single-chip microcomputer (1).
5. Passive LC D according to claim 1 shows the constant current electronic load, it is characterized in that: described electronic load also includes control button (9), and this control button (9) is delivered a letter and connected single-chip microcomputer (1).
6. Passive LC D according to claim 1 shows the constant current electronic load, and it is characterized in that: described electronic load also includes LED light group (10), and this LED light group (10) is subjected to single-chip microcomputer (1) Control work.
7. Passive LC D according to claim 6 shows the constant current electronic load, it is characterized in that: described LED light group (10) is by the discharge pilot lamp and stop pilot lamp and form, described discharge pilot lamp with stop pilot lamp and worked by Single-chip Controlling, this discharge pilot lamp with stop the pilot lamp that pilot lamp is a different colours.
8. Passive LC D according to claim 7 shows the constant current electronic load, and it is characterized in that: described discharge pilot lamp is some green LED lamp; The described pilot lamp that stops is a red LED lamp.
9. Passive LC D according to claim 1 shows the constant current electronic load, it is characterized in that: described constant-current discharge circuit (4) is mainly by operational amplifier (U1B), discharge resistance and pliotron (Q1) connect to form, described pliotron (Q1) connects the positive pole and the discharge resistance of described power supply to be measured, discharge resistance connects described resistance (RS), this pliotron (Q1) is by the output terminal output control of operational amplifier (U1B), the in-phase input end of described operational amplifier (U1B) connects described D/A change-over circuit (3), and the reverse input end of this operational amplifier (U1B) is connected between pliotron (Q1) and the discharge resistance and constitutes negative feedback.
10. Passive LC D according to claim 9 shows the constant current electronic load, it is characterized in that: the collector of described pliotron (Q1) connects the positive pole of power supply to be measured, its emitter connects discharge resistance, and the output terminal of its base stage concatenation operation amplifier (U1B).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120121214 CN202057776U (en) | 2011-04-22 | 2011-04-22 | Passive liquid crystal display (LCD) constant-current electronic load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120121214 CN202057776U (en) | 2011-04-22 | 2011-04-22 | Passive liquid crystal display (LCD) constant-current electronic load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202057776U true CN202057776U (en) | 2011-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120121214 Expired - Fee Related CN202057776U (en) | 2011-04-22 | 2011-04-22 | Passive liquid crystal display (LCD) constant-current electronic load |
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| Country | Link |
|---|---|
| CN (1) | CN202057776U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749591A (en) * | 2011-04-22 | 2012-10-24 | 昆山金鑫新能源科技有限公司 | Passive LCD (liquid crystal display) display type constant-current electronic load |
| CN114625198A (en) * | 2020-12-10 | 2022-06-14 | 圣邦微电子（北京）股份有限公司 | Over-temperature protection threshold value measuring device and measuring method thereof |
-
2011
- 2011-04-22 CN CN 201120121214 patent/CN202057776U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102749591A (en) * | 2011-04-22 | 2012-10-24 | 昆山金鑫新能源科技有限公司 | Passive LCD (liquid crystal display) display type constant-current electronic load |
| CN114625198A (en) * | 2020-12-10 | 2022-06-14 | 圣邦微电子（北京）股份有限公司 | Over-temperature protection threshold value measuring device and measuring method thereof |
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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: 20111130 Termination date: 20140422 |