CN204807679U - Portable battery performance measurement appearance - Google Patents
Portable battery performance measurement appearance Download PDFInfo
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- CN204807679U CN204807679U CN201520250980.0U CN201520250980U CN204807679U CN 204807679 U CN204807679 U CN 204807679U CN 201520250980 U CN201520250980 U CN 201520250980U CN 204807679 U CN204807679 U CN 204807679U
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Abstract
The utility model discloses a portable battery performance measurement appearance mainly includes voltage, current detection part and single chip microcomputer system, output display and warning part, and it is based on the STC12C5A60S2 singlechip, through the singlechip from taking AD to detect and gather voltage to ACS712ELC -20A detects battery capacity for the electric current collector. Its working process is operating current and operating voltage and the open circuit voltage that the singlechip detected the battery, obtains residual capacity according to certain algorithm to send LCD to show that screen display shows. When the measurement finishes, singlechip signals drives the buzzer, the buzzer pipes. This system, the design is simple, and is with low costs, is applicable to to measure the detection to the most frequently used and the most audio -visual open circuit voltage, internal resistance, capacity parameter.
Description
Technical field:
The utility model belongs to cell measurement circuit design field, a kind of battery performance measuring instrument controlled based on STC12C5A60S2 Single Chip Microcomputer (SCM) program of specific design.
Background technology:
Along with the development in epoch, battery has become consumables important in daily life.The develop rapidly of the relevant industries such as China's communication, power electronics, makes people improve constantly the utilization factor of the batteries such as lithium ion battery and the attention degree of maintenance work, and the market demand that battery performance detects is thereupon increasing.At present, the demand of each electronic product to battery constantly increases, higher to the quality requirements of battery.Battery detecting with safeguard to personal safety and actual user demand significant.The portable battery performance detecting system designed herein measures battery actual capacity by the integration of Current versus time, and gathers measuring voltage by the AD of single-chip microcomputer self.Directly observed the important parameter of the voltage of battery, capacity and internal resistance by display screen, can effectively identify battery inferior, thus reduce the potential threat to electronic equipment and the person.Native system, simplicity of design, cost is low, is applicable to industry and individual's use.
Summary of the invention:
The purpose of this utility model is the bulky shortcoming of high cost overcoming existing battery measurement instrument, provides a kind of SCM Based Novel portable battery measurement instrument, and circuit production is convenient, reliable, and good stability, control accuracy is high, practical.
For realizing above technical purpose, the scheme that the utility model adopts is:
A kind of portable cell performance measurement instrument, described single-chip microcomputer adopts the STC12C5A60S2/AD/PWM series monolithic of STC series; Described current detection module adopts ACS712ELC-20A to be current collector; Described battery gear automatic switch-over circuit is divided into lithium battery and dry cell 2 gears, and electric resistance partial pressure value, is switched by relay; Described constant current circuit is made up of triode 2SC2500 and 3 resistance, and discharge current is determined by the ratio of resistance and resistance.
It is integrally-built is characterised in that it selects module, battery rapid discharge gear and the steady current gear that discharges to form by current detection module, voltage detection module, battery gear automatically.Carrying AD by single-chip microcomputer to detect voltage and gather, is that current collector detects battery capacity with ACS712ELC-20A.STC12C5A60S2/AD/PWM series monolithic is the single-chip microcomputer of single clock/machine cycle (1T) that STC Corporation produces, high speed, low-power consumption, superpower jamproof 8051 single-chip microcomputers of new generation, the completely compatible tradition 8051 of instruction code, but the fast 8-12 of speed is doubly.Inner integrated MAX810 Special reset circuit, 2 road PWM, 8 road 10-bit high speed A/D change (250K/S), for Electric Machine Control, strong jamming occasion.Voltage measurement module uses single-chip microcomputer to carry the collection of high-speed AD acquisition mouth; Battery gear selects module automatically, by 4 electric resistance partial pressures, forms lithium battery and dry cell two gears, is gathered judge and a relay automatic switchover lithium battery gear and dry cell gear by AD.Rapid discharge gear and steady current gear carry out circuit switching by a relay, and steady current forms constant cell stream discharge circuit by triode 2SC2500 and 3 resistance, and discharge current is determined by the ratio of resistance and resistance.
The beneficial effects of the utility model are:
(1) the 8 road 10-bit high speed A/D utilizing STC12C5A60S2 single-chip microcomputer to carry change (250K/S) and carry out voltage acquisition, and speed is fast, precision is high, precision can reach 1 μ V.
(2) utilize ACS712ELC-20A to survey electric current for current collector, the response time between constrained input is 5 μ s, can measure positive and negative 20A electric current, corresponding analog output 100mV/A, measures electric current more accurately at a high speed.
(3) this single-chip microcomputer is high speed, low-power consumption, superpower antijamming capability, and cost is low, and circuit production is convenient, reliable, and measuring accuracy is high, practical, can be applicable in experimental teaching, engineering practice and daily life.
Accompanying drawing explanation
Fig. 1 is hardware principle block diagram of the present utility model
Fig. 2 is ACS712 typical apply of the present utility model
Fig. 3 is each module metering circuit of the present utility model
Fig. 4 is main program flow sketch of the present utility model
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
System hardware block diagram as shown in Figure 1, mainly comprises voltage, current detecting part and Single Chip Microcomputer (SCM) system, output display and alarm portion.Main working process is the working current of microprocessor detect battery and operating voltage and open-circuit voltage, obtains residual capacity, and send LCD display to show by certain algorithm.When measure complete time, single-chip microcomputer send signal drive hummer, buzzer call.
Native system adopts current time integral method to measure battery capacity, then carries out data processing, is finally real-time transmitted to LED1602, to be selected and the display of test result by 1602LCD display screen to function.
Native system measuring voltage is that 8 road 10-bit high speed A/D conversion (250K/S) utilizing STC12C5A60S2 single-chip microcomputer to carry carry out voltage acquisition, and its detection speed is fast, and precision can reach 1 μ V.
Native system utilizes Allegro Hall current sensor to carry out current measurement, and its model is ACS712ELC-20A.The precision of typical apply as the total temperature scope of Fig. 2, ACS712ELC-20A is ± 1.5%, 25 ~ 85 DEG C time, precision characteristic is better, response time between constrained input is 5 μ s, can measure ± 20A within the scope of electric current, its corresponding analog output 100mV/A.
Each module metering circuit is as Fig. 3, VT
1, R
1, R
4, R
5in composition battery constant-current discharge circuit, discharge current is by R
5, R
4ratio and R
1resistance determine, discharge current is decided to be 200mA.A wherein road P1.0 in selection STC12C5A60S2 single-chip microcomputer 8 road AD is as the voltage acquisition mouth of battery.By P2.1 pilot relay K
1, carry out electric discharge and switch, when P2.1 output low level, the actuating of relay, enter rapid discharge state, when P2.1 exports high level, relay resets, when now P2.3 is low level, triode not conducting is in high-impedance state state, and battery is approximate is in open-circuit condition, when P2.3 is high level, triode ON, battery is in steady current state.
The switching of automatic gear, the open-circuit voltage that this module is measured by the first step, judges that institute surveys the kind of battery, then passes through P2.2 pilot relay, carry out gear switch, thus cut-off voltage is set, when sparking voltage is lower than the voltage specified, comparer LM358 output low level gives P2.4, after single-chip microcomputer identification, report to the police, and then measuring process terminates, and result is real-time transmitted in LCD screen.
The measurement of internal resistance, the response time between the constrained input of ACS712ELC-20A chip is 5 μ s.By pilot relay K
1, select rapid discharge gear, carry out 5ms point position and gather, gather electric current this moment and magnitude of voltage.Computing formula by internal resistance: R
in=(V
0-V)/I, calculate.Every 200ms gathers once, gathers and averages for 4 times.Finally draw the internal resistance value of battery, and deliver to display on LCD.
Program uses C language to write, and program is made up of the part such as master routine and Interruption service subprogram, time delay subroutine.Main program flow sketch is as Fig. 4.
VCC in the present embodiment all adopts 5V to power, within precision controlling can reach 1 μ V, can measure ± 20A within the scope of electric current.Native system, simplicity of design, cost is low, can application and electric circuit design, in practical teaching and daily life.
Claims (5)
1. a portable battery performance measurement instrument, integrally-built being characterised in that comprises: current detection module, voltage detection module, battery gear select module automatically, battery rapid discharge gear and steady current electric discharge gear; Wherein said current detection module take ACS712ELC-20A as current collector, assisted and realize by program; Voltage measurement module uses single-chip microcomputer to carry the collection of high-speed AD acquisition mouth; Battery gear selects module automatically, by 4 electric resistance partial pressures, forms lithium battery and dry cell two gears, is gathered judge and a relay automatic switchover lithium battery gear and dry cell gear by AD; Rapid discharge gear and steady current gear carry out circuit switching by a relay, and steady current forms constant cell stream discharge circuit by triode 2SC2500 and 3 resistance, and discharge current is determined by the ratio of resistance and resistance.
2. a kind of portable battery performance measurement instrument according to claim 1, is characterized in that: described single-chip microcomputer adopts the STC12C5A60S2/AD/PWM series monolithic of STC series.
3. a kind of portable battery performance measurement instrument according to claim 1, is characterized in that: described current detection module adopts ACS712ELC-20A to be current collector.
4. a kind of portable battery performance measurement instrument according to claim 1, is characterized in that: described battery gear automatic switch-over circuit is divided into lithium battery and dry cell 2 gears, and electric resistance partial pressure value, is switched by relay.
5. a kind of portable battery performance measurement instrument according to claim 1, is characterized in that: described constant current circuit is made up of triode 2SC2500 and 3 resistance, and discharge current is determined by the ratio of resistance and resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520250980.0U CN204807679U (en) | 2015-04-20 | 2015-04-20 | Portable battery performance measurement appearance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520250980.0U CN204807679U (en) | 2015-04-20 | 2015-04-20 | Portable battery performance measurement appearance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204807679U true CN204807679U (en) | 2015-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520250980.0U Expired - Fee Related CN204807679U (en) | 2015-04-20 | 2015-04-20 | Portable battery performance measurement appearance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271919A (en) * | 2017-07-24 | 2017-10-20 | 姜舒宁 | Retaining capacity of storage battery quick determination method and device |
| CN107612095A (en) * | 2017-10-26 | 2018-01-19 | 汤萍萍 | Battery detecting protection circuit |
-
2015
- 2015-04-20 CN CN201520250980.0U patent/CN204807679U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271919A (en) * | 2017-07-24 | 2017-10-20 | 姜舒宁 | Retaining capacity of storage battery quick determination method and device |
| CN107612095A (en) * | 2017-10-26 | 2018-01-19 | 汤萍萍 | Battery detecting protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151125 Termination date: 20160420 |