CN105591457A - Power supply circuit for automobile instruments - Google Patents
Power supply circuit for automobile instruments Download PDFInfo
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- CN105591457A CN105591457A CN201410565324.XA CN201410565324A CN105591457A CN 105591457 A CN105591457 A CN 105591457A CN 201410565324 A CN201410565324 A CN 201410565324A CN 105591457 A CN105591457 A CN 105591457A
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- circuit
- divider resistance
- electronic switching
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- bleeder circuit
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Abstract
The invention provides a power supply circuit for automobile instruments. According to the power supply circuit, the power input ends of a first voltage division circuit, a second voltage division circuit and a sampling voltage division circuit are connected with the output end of an input power supply; the partial voltage output end of the first voltage division circuit is connected with the input end of a first electronic switch circuit; the partial voltage output end of the sampling voltage division circuit is connected with an A/D sampling pin of a single-chip microcomputer; the partial voltage output end of the second voltage division circuit is connected with the input end of a second electronic switch circuit; two I/O pins of the single-chip microcomputer are respectively connected with the control ends of the first electronic switch circuit and the second electronic switch circuit; the output ends of the first electronic switch circuit and the second electronic switch circuit are connected with the input end of a voltage stabilization circuit; the voltage stabilization output end of the voltage stabilization circuit is connected with an instrument circuit; and the partial voltage output value of the first voltage division circuit is greater than that of the second voltage division circuit. The output voltage of the power supply circuit for automobile instruments can be controlled, and power supply is stable and reliable.
Description
Technical field
The present invention relates to a kind of power supply circuits, especially a kind of power supply circuits for automobile instrument, belong to vehicle electric field.
Background technology
In the time that automobile instrument circuit is powered; because storage battery power supply termination contact is bad and produce high high voltage when the work of powerful inductive load; when solving the high voltage interference of power end; the circuit module that connects power supply is caused to damage problem; need to adopt holding circuit at power input, the amplitude of power supply output is controlled in certain scope.
At present; existing technical scheme is to increase TVS device at power input; to absorb higher than TVS limit value voltage; protection rear end power circuit; but the shortcoming of this technical scheme is in the time that high pressure amplitude is too high and width is longer; TVS protects inefficacy, causes interior power supply circuit to damage, system failure. The power of at present domestic TVS is less, can not meet design requirement, and import TVS price is more expensive, requiring the occasion that voltage disturbance amplitude is higher, can not meet design requirement.
And the power supply circuits of existing automobile instrument can not obtain applicable supply voltage according to actual needs, cause occurring that appliance circuit damages in the time that supply voltage is too high, can not effectively protect automobile instrument.
Summary of the invention
The technical problem to be solved in the present invention is that existing automobile instrument power supply circuits can cause automobile instrument to damage in the time of superpressure, can not effectively regulate according to actual needs supply voltage size.
In order to solve the problems of the technologies described above, the invention provides a kind of automobile instrument power supply circuits, comprise sampling bleeder circuit, single-chip microcomputer, the first bleeder circuit, the first electronic switching circuit, the second bleeder circuit, the second electronic switching circuit and mu balanced circuit; The power input of the first bleeder circuit, the second bleeder circuit and sampling bleeder circuit is all for being connected with the output of input power; The dividing potential drop output of the first bleeder circuit is connected with the input of the first electronic switching circuit; The sampling dividing potential drop output of bleeder circuit and the A/D of single-chip microcomputer sampling pin are connected; The dividing potential drop output of the second bleeder circuit is connected with the input of the second electronic switching circuit; Two I/O pins of single-chip microcomputer are connected with the control end of the second electronic switching circuit with the first electronic switching circuit respectively; The output of the first electronic switching circuit and the second electronic switching circuit is all connected with the input of mu balanced circuit; The output end of pressure-stabilizing of mu balanced circuit is for being connected with appliance circuit; The dividing potential drop output valve of the first bleeder circuit is greater than the dividing potential drop output valve of the second bleeder circuit.
Adopting the bleeder circuit of different dividing potential drop output valves can meet under different power voltage protects mu balanced circuit and appliance circuit; Adopt mu balanced circuit can further improve the power supply effect to appliance circuit.
As further restriction scheme of the present invention, the first electronic switching circuit comprises a NPN type triode Q1 and the first diode D1; The second electronic switching circuit comprises the 2nd NPN type triode Q2 and the second diode D2; The colelctor electrode of the one NPN type triode Q1 is connected with the dividing potential drop output of the first bleeder circuit, the base stage of the one NPN type triode Q1 is connected with the I/O pin of single-chip microcomputer, the emitter stage of the one NPN type triode Q1 is connected with the positive pole of the first diode D1, and the first negative pole of diode D1 and the input of mu balanced circuit are connected; The colelctor electrode of the 2nd NPN type triode Q2 is connected with the dividing potential drop output of the second bleeder circuit, the base stage of the 2nd NPN type triode Q2 is connected with the I/O pin of single-chip microcomputer, the emitter stage of the 2nd NPN type triode Q2 is connected with the positive pole of the second diode D2, and the second negative pole of diode D2 and the input of mu balanced circuit are connected. Adopt the first diode D1 and the second diode D2 can effectively prevent that voltage from pouring in down a chimney, a NPN type triode Q1 and the 2nd NPN type triode Q2 are protected.
As further restriction scheme of the present invention, the first bleeder circuit comprises the first divider resistance R1 and the second divider resistance R2, ground connection after the first divider resistance R1 and the second divider resistance R2 connect successively, the input of the first electronic switching circuit is connected to the junction of the first divider resistance R1 and the second divider resistance R2; The second bleeder circuit comprises the 3rd divider resistance R3 and the 4th divider resistance R4, ground connection after the 3rd divider resistance R3 and the 4th divider resistance R4 connect successively, the input of the second electronic switching circuit is connected to the junction of the 3rd divider resistance R3 and the 4th divider resistance R4; The ratio of the first divider resistance R1 and the second divider resistance R2 is less than the ratio of the 3rd divider resistance R3 and the 4th divider resistance R4.
Beneficial effect of the present invention is: (1) adopts the bleeder circuit of different dividing potential drop output valves can meet under different power voltage mu balanced circuit and appliance circuit are protected; (2) adopt mu balanced circuit can further improve the power supply effect to appliance circuit.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is partial circuit figure of the present invention.
Detailed description of the invention
As illustrated in fig. 1 and 2, automobile instrument power supply circuits of the present invention comprise: sampling bleeder circuit, single-chip microcomputer, the first bleeder circuit, the first electronic switching circuit, the second bleeder circuit, the second electronic switching circuit and mu balanced circuit; The power input of the first bleeder circuit, the second bleeder circuit and sampling bleeder circuit is all for being connected with the output of input power; The dividing potential drop output of the first bleeder circuit is connected with the input of the first electronic switching circuit; The sampling dividing potential drop output of bleeder circuit and the A/D of single-chip microcomputer sampling pin are connected; The dividing potential drop output of the second bleeder circuit is connected with the input of the second electronic switching circuit; Two I/O pins of single-chip microcomputer are connected with the control end of the second electronic switching circuit with the first electronic switching circuit respectively; The output of the first electronic switching circuit and the second electronic switching circuit is all connected with the input of mu balanced circuit; The output end of pressure-stabilizing of mu balanced circuit is for being connected with appliance circuit; The dividing potential drop output valve of the first bleeder circuit is greater than the dividing potential drop output valve of the second bleeder circuit.
Wherein, sampling bleeder circuit is general conventional bleeder circuit, as long as partial pressure value can meet the mouth of pipe voltage request of single-chip microcomputer, the first electronic switching circuit comprises a NPN type triode Q1 and the first diode D1; The second electronic switching circuit comprises the 2nd NPN type triode Q2 and the second diode D2; The colelctor electrode of the one NPN type triode Q1 is connected with the dividing potential drop output of the first bleeder circuit, the base stage of the one NPN type triode Q1 is connected with the I/O pin of single-chip microcomputer, the emitter stage of the one NPN type triode Q1 is connected with the positive pole of the first diode D1, and the first negative pole of diode D1 and the input of mu balanced circuit are connected; The colelctor electrode of the 2nd NPN type triode Q2 is connected with the dividing potential drop output of the second bleeder circuit, the base stage of the 2nd NPN type triode Q2 is connected with the I/O pin of single-chip microcomputer, the emitter stage of the 2nd NPN type triode Q2 is connected with the positive pole of the second diode D2, and the second negative pole of diode D2 and the input of mu balanced circuit are connected.
The first bleeder circuit comprises the first divider resistance R1 and the second divider resistance R2, ground connection after the first divider resistance R1 and the second divider resistance R2 connect successively, the input of the first electronic switching circuit is connected to the junction of the first divider resistance R1 and the second divider resistance R2; The second bleeder circuit comprises the 3rd divider resistance R3 and the 4th divider resistance R4, ground connection after the 3rd divider resistance R3 and the 4th divider resistance R4 connect successively, the input of the second electronic switching circuit is connected to the junction of the 3rd divider resistance R3 and the 4th divider resistance R4; The ratio of the first divider resistance R1 and the second divider resistance R2 is less than the ratio of the 3rd divider resistance R3 and the 4th divider resistance R4.
Automobile instrument power supply circuits of the present invention are in the time of work, first by sampling bleeder circuit, the voltage of input power is carried out to dividing potential drop, and by the A/D sampling pin of single-chip microcomputer, the dividing potential drop output valve of sampling bleeder circuit is sampled, obtain the voltage of input power when larger when gathering to calculate, close the first electronic switching circuit by Single-chip Controlling, open the second electronic switching circuit simultaneously, when the input supply voltage collecting hour, control and close the second electronic switching circuit, open the first electronic switching circuit simultaneously, thereby for mu balanced circuit provides the input voltage of suitable size, can effectively prevent that mu balanced circuit and appliance circuit from damaging, improve the reliability of power supply circuits and controlled.
Claims (3)
1. automobile instrument power supply circuits, is characterized in that: comprise sampling bleeder circuit, single-chip microcomputer, the first bleeder circuit, the first electronic switching circuit, the second bleeder circuit, the second electronic switching circuit and mu balanced circuit; The power input of described the first bleeder circuit, the second bleeder circuit and sampling bleeder circuit is all for being connected with the output of input power; The dividing potential drop output of described the first bleeder circuit is connected with the input of the first electronic switching circuit; The dividing potential drop output of described sampling bleeder circuit is connected with the A/D of single-chip microcomputer sampling pin; The dividing potential drop output of described the second bleeder circuit is connected with the input of the second electronic switching circuit; Two I/O pins of described single-chip microcomputer are connected with the control end of the second electronic switching circuit with the first electronic switching circuit respectively; The output of described the first electronic switching circuit and the second electronic switching circuit is all connected with the input of mu balanced circuit; The output end of pressure-stabilizing of described mu balanced circuit is for being connected with appliance circuit; The dividing potential drop output valve of described the first bleeder circuit is greater than the dividing potential drop output valve of the second bleeder circuit.
2. automobile instrument power supply circuits according to claim 1, is characterized in that: described the first electronic switching circuit comprises a NPN type triode Q1 and the first diode D1; Described the second electronic switching circuit comprises the 2nd NPN type triode Q2 and the second diode D2; The colelctor electrode of a described NPN type triode Q1 is connected with the dividing potential drop output of the first bleeder circuit, the base stage of a described NPN type triode Q1 is connected with the I/O pin of single-chip microcomputer, the emitter stage of a described NPN type triode Q1 is connected with the positive pole of the first diode D1, and described the first negative pole of diode D1 and the input of mu balanced circuit are connected; The colelctor electrode of described the 2nd NPN type triode Q2 is connected with the dividing potential drop output of the second bleeder circuit, the base stage of described the 2nd NPN type triode Q2 is connected with the I/O pin of single-chip microcomputer, the emitter stage of described the 2nd NPN type triode Q2 is connected with the positive pole of the second diode D2, and described the second negative pole of diode D2 and the input of mu balanced circuit are connected.
3. automobile instrument power supply circuits according to claim 1, it is characterized in that: described the first bleeder circuit comprises the first divider resistance R1 and the second divider resistance R2, ground connection after described the first divider resistance R1 and the second divider resistance R2 connect successively, the input of described the first electronic switching circuit is connected to the junction of the first divider resistance R1 and the second divider resistance R2; Described the second bleeder circuit comprises the 3rd divider resistance R3 and the 4th divider resistance R4, ground connection after described the 3rd divider resistance R3 and the 4th divider resistance R4 connect successively, the input of described the second electronic switching circuit is connected to the junction of the 3rd divider resistance R3 and the 4th divider resistance R4; The ratio of described the first divider resistance R1 and the second divider resistance R2 is less than the ratio of the 3rd divider resistance R3 and the 4th divider resistance R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410565324.XA CN105591457A (en) | 2014-10-22 | 2014-10-22 | Power supply circuit for automobile instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410565324.XA CN105591457A (en) | 2014-10-22 | 2014-10-22 | Power supply circuit for automobile instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105591457A true CN105591457A (en) | 2016-05-18 |
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ID=55930788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410565324.XA Pending CN105591457A (en) | 2014-10-22 | 2014-10-22 | Power supply circuit for automobile instruments |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105591457A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110435565A (en) * | 2019-07-02 | 2019-11-12 | 未来汽车科技（深圳）有限公司 | A kind of power-supplying circuit and method, automobile instrument and automobile of automobile instrument |
-
2014
- 2014-10-22 CN CN201410565324.XA patent/CN105591457A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110435565A (en) * | 2019-07-02 | 2019-11-12 | 未来汽车科技（深圳）有限公司 | A kind of power-supplying circuit and method, automobile instrument and automobile of automobile instrument |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160518 |