CN202916322U - Electric quantity display circuit of mobile power supply - Google Patents
Electric quantity display circuit of mobile power supply Download PDFInfo
- Publication number
- CN202916322U CN202916322U CN 201220570159 CN201220570159U CN202916322U CN 202916322 U CN202916322 U CN 202916322U CN 201220570159 CN201220570159 CN 201220570159 CN 201220570159 U CN201220570159 U CN 201220570159U CN 202916322 U CN202916322 U CN 202916322U
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- resistance
- microprocessor
- resistor
- electric quantity
- quantity display
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- Expired - Fee Related
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Abstract
The present utility model discloses an electric quantity display circuit of a mobile power supply. The circuit comprises a microprocessor, a nixie tube, a shunting reference device and a voltage dividing circuit; the nixie tube is connected with the microprocessor; the voltage-dividing circuit is composed of a first resistor, a second resistor and a third resistor; one end of the first resistor is connected with an anode of the mobile power supply; the other end of the first resistor is connected with the ground through the second resistor; and a connecting point of the first resistor and the second resistor is connected with a first input port of the microprocessor through the third resistor. The electric quantity display circuit of the mobile power supply can be used for accurately detecting residual electricity value of the mobile power supply, the circuit is simple and easy to implement.
Description
Technical field
The utility model relates to a kind of electric quantity display circuit of portable power source.
Background technology
Portable power source can cause automatic shield if electric weight is crossed to hang down in use, not only affects the normal of other consumers, and portable power source itself is brought infringement, therefore is necessary to design a kind of electric quantity display circuit of portable power source.
The utility model content
Technical problem to be solved in the utility model provides a kind of electric quantity display circuit of portable power source, and the electric quantity display circuit of this portable power source can accurately detect the residual electric quantity of portable power source, and circuit is simple, and is easy to implement.
The technical solution of utility model is as follows:
A kind of electric quantity display circuit of portable power source comprises microprocessor, charactron, shunting benchmark device, bleeder circuit; Charactron is connected with microprocessor;
Bleeder circuit is comprised of the first resistance, the second resistance and the 3rd resistance; The positive pole of one termination portable power source of the first resistance; The other end of the first resistance is by the second resistance eutral grounding; The tie point of the first resistance and the second resistance connects the first input end mouth of microprocessor by the 3rd resistance;
The plus earth of shunting benchmark device, the negative pole of shunting benchmark device connects the first output port of microprocessor through the 4th resistance, the negative pole of shunting benchmark device extremely all is connected with the second input port of microprocessor with being connected, and is connected to electric capacity between the second input port of microprocessor and the ground; Described microprocessor is the SN8P2722 chip.
Beneficial effect:
The electric quantity display circuit of portable power source of the present utility model, detect the voltage of portable power source by bleeder circuit, adopt again based on the reference voltage of shunting benchmark device TL431 as reference voltage, can accurately detect the magnitude of voltage of current portable power source, and show in real time electric weight according to this magnitude of voltage by charactron; The convenient operation person in time understands current electric weight situation, in order in time charge when electric weight is low.
Description of drawings
Fig. 1 is the circuit diagram of the electric quantity display circuit of portable power source of the present utility model.
Embodiment
Below with reference to the drawings and specific embodiments the utility model is described in further details:
Embodiment 1:
As shown in Figure 1, a kind of electric quantity display circuit of portable power source comprises microprocessor, charactron, shunting benchmark device TL431, bleeder circuit; Charactron is connected with microprocessor;
Bleeder circuit is comprised of the first resistance R 5, the second resistance R 6 and the 3rd resistance R 7; The positive pole of one termination portable power source of the first resistance R 5; The other end of the first resistance R 5 is by the second resistance R 6 ground connection; The tie point of the first resistance R 5 and the second resistance R 6 meets the first input end mouth P4.4 of microprocessor by the 3rd resistance R 7.
The plus earth of shunting benchmark device TL431, the negative pole of shunting benchmark device TL431 meets the first output port P4.1 of microprocessor through the 4th resistance R 8, the negative pole of shunting benchmark device TL431 extremely all is connected with the second input port P4.0 of microprocessor with being connected, and is connected to capacitor C between the second input port P4.0 of microprocessor and the ground; Described microprocessor is the SN8P2722 chip.
The explanation of circuit working principle:
Microprocessor detects the current voltage of portable power source by bleeder circuit, in fact this electric circuit inspection is the voltage of exporting at the P4.4 terminal by behind R5 and two electric resistance partial pressures of R6, AD converter integrated in the microprocessor is digital quantity with this voltage transitions, and namely there is proportionate relationship in this digital quantity with the current dump energy of portable power source.Be 50% such as the current residual electric weight, then show numeral " 50 " at charactron.
In order to gather accurate data, microprocessor utilizes TL431 as reference source (reference voltage is 2.5V).
Claims (2)
1. the electric quantity display circuit of a portable power source is characterized in that, comprises microprocessor, charactron, shunting benchmark device TL431, bleeder circuit; Charactron is connected with microprocessor; Bleeder circuit is comprised of the first resistance R 5, the second resistance R 6 and the 3rd resistance R 7; The positive pole of one termination portable power source of the first resistance R 5; The other end of the first resistance R 5 is by the second resistance R 6 ground connection; The tie point of the first resistance R 5 and the second resistance R 6 meets the first input end mouth P4.4 of microprocessor by the 3rd resistance R 7; The plus earth of shunting benchmark device TL431, the negative pole of shunting benchmark device TL431 meets the first output port P4.1 of microprocessor through the 4th resistance R 8, the negative pole of shunting benchmark device TL431 extremely all is connected with the second input port P4.0 of microprocessor with being connected, and is connected to capacitor C between the second input port P4.0 of microprocessor and the ground.
2. the electric quantity display circuit of described portable power source according to claim 1 is characterized in that described microprocessor is the SN8P2722 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220570159 CN202916322U (en) | 2012-11-01 | 2012-11-01 | Electric quantity display circuit of mobile power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220570159 CN202916322U (en) | 2012-11-01 | 2012-11-01 | Electric quantity display circuit of mobile power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202916322U true CN202916322U (en) | 2013-05-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220570159 Expired - Fee Related CN202916322U (en) | 2012-11-01 | 2012-11-01 | Electric quantity display circuit of mobile power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202916322U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104714191A (en) * | 2013-12-14 | 2015-06-17 | 中国航空工业集团公司第六三一研究所 | Multi-stage numerical control constant current source output and detection circuit |
-
2012
- 2012-11-01 CN CN 201220570159 patent/CN202916322U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104714191A (en) * | 2013-12-14 | 2015-06-17 | 中国航空工业集团公司第六三一研究所 | Multi-stage numerical control constant current source output and detection 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 |
Granted publication date: 20130501 Termination date: 20151101 |
|
| EXPY | Termination of patent right or utility model |