CN105589364A - Controllable power supply circuit for automobile instruments - Google Patents
Controllable power supply circuit for automobile instruments Download PDFInfo
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- CN105589364A CN105589364A CN201410564857.6A CN201410564857A CN105589364A CN 105589364 A CN105589364 A CN 105589364A CN 201410564857 A CN201410564857 A CN 201410564857A CN 105589364 A CN105589364 A CN 105589364A
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Abstract
The invention provides a controllable power supply circuit for automobile instruments, comprising a sampling voltage dividing circuit, a single-chip microcomputer, a digital voltage dividing circuit, and a voltage stabilizing circuit. The input end of the sampling voltage dividing circuit is used for being connected with the power end of an input power supply, and the voltage dividing output end of the sampling voltage dividing circuit is connected with an A/D sampling pin of the single-chip microcomputer. The digital voltage dividing circuit comprises a voltage dividing resistor R3 and a digital potentiometer, wherein one end of the voltage dividing resistor is used for being connected with the power end of the input power supply, the other end of the voltage dividing resistor is connected with the sliding end pin of the digital potentiometer, the low-voltage end pin of the digital potentiometer is connected with ground, and the control end of the digital potentiometer is connected with an I/O pin of the single-chip microcomputer. The input end of the voltage stabilizing circuit is connected to the joint of the voltage dividing resistor and the sliding end pin of the digital potentiometer. The voltage stabilizing output end of the voltage stabilizing circuit is used for being connected with the power input end of an instrument circuit. According to the controllable power supply circuit for automobile instruments, the input voltage of the voltage stabilizing circuit can be changed in real time, and the instrument circuit is protected effectively.
Description
Technical field
The present invention relates to a kind of power supply protection circuit, 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 the controlled power supply circuits of a kind of automobile instrument, comprise sampling bleeder circuit, single-chip microcomputer, digital bleeder circuit and mu balanced circuit; The input of sampling bleeder circuit is for being connected with the power end of input power, and the sampling dividing potential drop output of bleeder circuit and the A/D of single-chip microcomputer sampling pin are connected; Numeral bleeder circuit comprises divider resistance R3 and digital regulation resistance, one end of divider resistance is for being connected with the power end of input power, the other end of divider resistance is connected with the sliding end pin of digital regulation resistance, the low-pressure end pin ground connection of digital regulation resistance, the control end of digital regulation resistance is connected with the I/O pin of single-chip microcomputer; The input of mu balanced circuit is connected to the junction of the sliding end pin of divider resistance and digital regulation resistance; The output end of pressure-stabilizing of mu balanced circuit is for being connected with the power input of appliance circuit.
Adopt divider resistance and digital regulation resistance to form bleeder circuit, can change in real time according to the control of single-chip microcomputer the pressure-dividing output voltage of bleeder circuit, thereby mu balanced circuit and appliance circuit are effectively protected; Adopt mu balanced circuit can further improve the power supply effect to appliance circuit.
As further restriction scheme of the present invention, mu balanced circuit comprises filter capacitor C1, protective resistance R4 and voltage-stabiliser tube D1; One end of protective resistance R4 is connected to the junction of the sliding end pin of divider resistance and digital regulation resistance, the other end ground connection of filter capacitor C1 after being connected with one end of filter capacitor C1; The other end of protective resistance R4 is used further to after being connected with the negative pole of voltage-stabiliser tube D1 be connected with the power input of appliance circuit, the plus earth of voltage-stabiliser tube D1. Adopt filter capacitor C1 can further improve the power supply quality of mu balanced circuit; Adopt protective resistance R4 to carry out effective high voltage protective to voltage-stabiliser tube.
Beneficial effect of the present invention is: (1) adopts divider resistance and digital regulation resistance to form bleeder circuit, can change in real time according to the control of single-chip microcomputer the pressure-dividing output voltage of bleeder circuit, thereby mu balanced circuit and appliance circuit are effectively 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 sampling bleeder circuit of the present invention;
Fig. 3 is digital bleeder circuit of the present invention and mu balanced circuit.
Detailed description of the invention
As Figure 1-3, the controlled power supply circuits of automobile instrument of the present invention, comprise sampling bleeder circuit, single-chip microcomputer, digital bleeder circuit and mu balanced circuit; The input of sampling bleeder circuit is for being connected with the power end of input power, and the sampling dividing potential drop output of bleeder circuit and the A/D of single-chip microcomputer sampling pin are connected; Numeral bleeder circuit comprises divider resistance R3 and digital regulation resistance, one end of divider resistance R3 is for being connected with the power end of input power, the other end of divider resistance R3 is connected with the sliding end pin of digital regulation resistance, the low-pressure end pin ground connection of digital regulation resistance, the control end of digital regulation resistance is connected with the I/O pin of single-chip microcomputer; The input of mu balanced circuit is connected to the junction of the sliding end pin of divider resistance R3 and digital regulation resistance; The output end of pressure-stabilizing of mu balanced circuit is for being connected with the power input of appliance circuit.
Wherein, mu balanced circuit comprises filter capacitor C1, protective resistance R4 and voltage-stabiliser tube D1; One end of protective resistance R4 is connected to the junction of the sliding end pin of divider resistance R3 and digital regulation resistance, the other end ground connection of filter capacitor C1 after being connected with one end of filter capacitor C1; The other end of protective resistance R4 is used further to after being connected with the negative pole of voltage-stabiliser tube D1 be connected with the power input of appliance circuit, the plus earth of voltage-stabiliser tube D1.
Wherein, sampling bleeder circuit can be in series by two sampling divider resistance R1 and R2, and digital regulation resistance can adopt the digital potentiometer of X9313 model.
The controlled power supply circuits of automobile instrument of the present invention are in the time of work; first by sampling bleeder circuit, input power is carried out to dividing potential drop; carry out real-time sampling by single-chip microcomputer again; obtain the real-time voltage of input power; send corresponding control command by single-chip microcomputer to digital regulation resistance again; in the time that the output voltage of input power is higher; reduce the access resistance value of digital regulation resistance; in the time that the output voltage of input power is lower; increase the access value of digital regulation resistance; thereby meet all the time the input voltage range requirement of mu balanced circuit, appliance circuit is effectively protected.
Claims (2)
1. the controlled power supply circuits of automobile instrument, is characterized in that: comprise sampling bleeder circuit, single-chip microcomputer, digital bleeder circuit and mu balanced circuit; The input of described sampling bleeder circuit is for being connected with the power end of input power, and the dividing potential drop output of described sampling bleeder circuit is connected with the A/D of single-chip microcomputer sampling pin; Described digital bleeder circuit comprises divider resistance R3 and digital regulation resistance, one end of described divider resistance is for being connected with the power end of input power, the other end of described divider resistance is connected with the sliding end pin of digital regulation resistance, the low-pressure end pin ground connection of described digital regulation resistance, the control end of described digital regulation resistance is connected with the I/O pin of single-chip microcomputer; The input of described mu balanced circuit is connected to the junction of the sliding end pin of divider resistance and digital regulation resistance; The output end of pressure-stabilizing of described mu balanced circuit is for being connected with the power input of appliance circuit.
2. the controlled power supply circuits of automobile instrument according to claim 1, is characterized in that: described mu balanced circuit comprises filter capacitor C1, protective resistance R4 and voltage-stabiliser tube D1; One end of described protective resistance R4 is connected to the junction of the sliding end pin of divider resistance and digital regulation resistance, the other end ground connection of described filter capacitor C1 after being connected with one end of filter capacitor C1; The other end of described protective resistance R4 is used further to after being connected with the negative pole of voltage-stabiliser tube D1 be connected with the power input of appliance circuit, the plus earth of described voltage-stabiliser tube D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410564857.6A CN105589364A (en) | 2014-10-22 | 2014-10-22 | Controllable power supply circuit for automobile instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410564857.6A CN105589364A (en) | 2014-10-22 | 2014-10-22 | Controllable power supply circuit for automobile instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105589364A true CN105589364A (en) | 2016-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410564857.6A Pending CN105589364A (en) | 2014-10-22 | 2014-10-22 | Controllable power supply circuit for automobile instruments |
Country Status (1)
| Country | Link |
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| CN (1) | CN105589364A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106685234A (en) * | 2017-02-09 | 2017-05-17 | 百色学院 | Step-down direct current switch voltage-stabilized source and voltage stability control method |
| CN114115416A (en) * | 2021-11-10 | 2022-03-01 | 吕梁学院 | Reference source for precisely adjusting voltage |
-
2014
- 2014-10-22 CN CN201410564857.6A patent/CN105589364A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106685234A (en) * | 2017-02-09 | 2017-05-17 | 百色学院 | Step-down direct current switch voltage-stabilized source and voltage stability control method |
| CN106685234B (en) * | 2017-02-09 | 2023-10-17 | 百色学院 | Voltage-reducing type direct-current switch voltage-stabilizing power supply and voltage-stabilizing control method |
| CN114115416A (en) * | 2021-11-10 | 2022-03-01 | 吕梁学院 | Reference source for precisely adjusting voltage |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160518 |
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| WD01 | Invention patent application deemed withdrawn after publication |