CN205059481U - Motormeter power supply circuit - Google Patents
Motormeter power supply circuit Download PDFInfo
- Publication number
- CN205059481U CN205059481U CN201520869085.7U CN201520869085U CN205059481U CN 205059481 U CN205059481 U CN 205059481U CN 201520869085 U CN201520869085 U CN 201520869085U CN 205059481 U CN205059481 U CN 205059481U
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- electric capacity
- power
- filter circuit
- dropout regulator
- instrument
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- 238000001914 filtration Methods 0.000 claims description 28
- 230000000087 stabilizing effect Effects 0.000 description 8
- 239000003381 stabilizer Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
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Abstract
The utility model relates to a motormeter power supply circuit, including low -dropout regulator, preceding filter circuit, back filter circuit, preceding filter circuit connect respectively the battery with low -dropout regulator's input, back filter circuit connects low -dropout regulator's output, preceding filter circuit is including first electric capacity and high -power TVS pipe, first electric capacity with the battery is connected, high -power TVS pipe set up in first electric capacity with between the low -dropout regulator. The utility model discloses can make the stable 5V power of car combination meter output of the power supply circuit supply power for the MCU of instrument, guarantee that the operation of instrument MCU is stable, and can provide electrostatic protection to combination meter's power pin foot, and can guarantee that the instrument power can stand the voltage pulse's in the power impact and the unstable condition of instrument function can not appear, has guaranteed the reliability of instrument work.
Description
Technical field
The utility model belongs to power circuit technical field, refers to a kind of automobile instrument power source circuit especially.
Background technology
Automobile combination meter power supply is the battery feed of 12V, and inner MCU operating voltage is 5V direct current (DC), power circuit be by storage battery 12V electricity be converted to instrument MCU can 5V power supply, because car load current consumer is more, fluctuation is there is in storage battery to instrument power supply, and MCU is responsive for voltage compare, power supply must be taken measures, ensure the reliable and stable of the 5V power supply that power circuit exports.
Existing technology automobile instrument power circuit as shown in Figure 1, use 10 μ F/50V electric capacity to carry out first time filtering to storage battery, use 470 μ F electric capacity to carry out voltage stabilizing and filtering to input voltage, re-use after 12V electricity being converted to 5V by chip after 100nF electric capacity carries out filtering and obtain stable 5V power supply through voltage stabilizing and filtering.
And 10 μ F/50V electric capacity voltage withstands are for being only 50V, the electrostatic requirement of instrument cannot be met; Use 470 μ F electric capacity to carry out voltage stabilizing, because car load current consumer is more, and the finite capacity of 470 μ F electric capacity, car load exists large pulse voltage cannot filtering and cause MCU voltage fluctuation to make instrument function unstable.
Utility model content
The purpose of this utility model proposes improvement opportunity scheme to the automobile instrument power source circuit of existing technology, can in guarantee to the electrostatic requirement that the basis of MCU stable power-supplying can meet instrument by the technical program.
The utility model is achieved through the following technical solutions:
A kind of automobile instrument power source circuit, includes low-dropout regulator, front filter circuit, post filtering circuit;
Described front filter circuit connects the input end of storage battery and described low-dropout regulator respectively; Described post filtering circuit connects the mouth of described low-dropout regulator;
Described front filter circuit includes the first electric capacity and high-power TVS pipe; Described first electric capacity is connected with described storage battery; Described high-power TVS pipe is arranged between described first electric capacity and described low-dropout regulator.
Further, described first electric capacity is 10 μ F/6kV electric capacity, carries out initial filter to described battery feed.
Further, described front filter circuit includes the second electric capacity, the 3rd electric capacity and the 4th electric capacity; Described second electric capacity, described 3rd electric capacity and described 4th electric capacity are set in turn between described first electric capacity and described low-dropout regulator; Described high-power TVS pipe is arranged between described first electric capacity and described second electric capacity; Described first electric capacity, described high-power TVS pipe, described second electric capacity, described 3rd electric capacity and described 4th Capacitance parallel connection are arranged.
Further, described post filtering circuit includes the 5th electric capacity, the 6th electric capacity and the 7th electric capacity; Described 5th electric capacity, described 6th electric capacity and described 7th Capacitance parallel connection are arranged.
Further, described front filter circuit includes the first rectifier diode.
Further, described post filtering circuit includes the second rectifier diode.
The beneficial effects of the utility model are:
The utility model carries out filtering by use 10 μ F/6kV electric capacity to storage battery initial voltage, then by high-power TVS pipe, the pulse voltage that power supply exists is carried out to the power circuit of filtering voltage stabilizing, re-use after 12V electricity being converted to 5V by chip after 470 μ F electric capacity and 100nF electric capacity carry out filtering and obtain stable 5V power supply through voltage stabilizing and filtering.
Accompanying drawing explanation
Fig. 1 is existing technology automobile instrument power circuit diagram;
Fig. 2 is the utility model automobile instrument power source circuit diagram.
Description of reference numerals
01 low voltage difference stabiliser, C1 first electric capacity, the high-power TVS pipe of D3, C2 second electric capacity, C3 the 3rd electric capacity, C4 the 4th electric capacity, D1 first rectifier diode, C5 the 5th electric capacity, C6 the 6th electric capacity, C7 the 7th electric capacity, D2 second rectifier diode.
Detailed description of the invention
Describe the technical solution of the utility model in detail by the following examples, following embodiment is only exemplary, only can be used for explaining and the technical solution of the utility model being described, and can not be interpreted as being the restriction to technical solutions of the utility model.
The utility model provides a kind of automobile instrument power source circuit, as shown in Figure 2, includes low-dropout regulator 01, front filter circuit, post filtering circuit; Described front filter circuit connects the input end of storage battery and described low-dropout regulator respectively; Described post filtering circuit connects the mouth of described low-dropout regulator; The application's instrument power circuit by 12V power supply after filtering, rectification, voltage stabilizing, filtering, voltage stabilizing and filtering finally obtains stable 5V power supply.
Described front filter circuit includes the first electric capacity C1 and high-power TVS pipe D3; Described first electric capacity is connected with described storage battery and carries out initial filter to described battery feed; Described high-power TVS pipe is arranged between described first electric capacity and described low-dropout regulator.Described first electric capacity is 10 μ F/6kV electric capacity, and its Main Function is filtering and electrostatic prevention, and its voltage withstand is 6kV, and the maximum voltage withstand value of usual electric capacity is 1.5 times of rated value, therefore the actual voltage withstand value of 0.1 μ F/6kV electric capacity is 6x1.5=9kV.And actual when carrying out electrostatic test, be that 8kV can normally work for the maximum sparking voltage General Requirements of pin pin contact discharge, 0.1 μ F/6kV electric capacity completely can when carrying out electrostatic test protection power source circuit and not breakdown.
The Main Function of high-power TVS pipe is voltage stabilizing, and in power circuit, B+ power supply can not be desirable 12V power supply, opens and closes all can produce fluctuation instantaneously at other electrical equipment of automobile, and the particularly unlatching of high-power electric appliance, the voltage fluctuation of turn-off transient are understood very large.According to voltage impulse listed in ISO7637-2, maximum magnitude of a voltage fluctuation can reach more than 75V, and the effect of high-power TVS pipe is exactly by the voltage impulse of these transient states of filtering, and B+ power supply can be tended towards stability.
Described front filter circuit includes the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4; Described second electric capacity, described 3rd electric capacity and described 4th electric capacity are set in turn between described first electric capacity and described low-dropout regulator; Described high-power TVS pipe is arranged between described first electric capacity and described second electric capacity; Described first electric capacity, described high-power TVS pipe, described second electric capacity, described 3rd electric capacity and described 4th Capacitance parallel connection are arranged.
In the present embodiment, the second electric capacity is 470 μ F, and the 3rd electric capacity and the 4th electric capacity are 100nF; Through the filtering of front filter circuit, obtain being supplied to low voltage difference stabiliser close to the ideal source of 12V, in the present embodiment, low voltage difference stabiliser is NCV4275 chip, then be converted to 5V DC power supply by low voltage difference stabiliser through DC/DC, then obtain stable 5V power supply through post filtering circuit and power to instrument MCU.
Described post filtering circuit includes the 5th electric capacity C5, the 6th electric capacity C6 and the 7th electric capacity C7; Described 5th electric capacity, described 6th electric capacity and described 7th Capacitance parallel connection are arranged.In the present embodiment, the 5th electric capacity is 470 μ F, and the 6th electric capacity and the 7th electric capacity are 100nF.
Described front filter circuit includes the first rectifier diode D1.Described post filtering circuit includes the second rectifier diode D2.
The utility model can make the 5V power supply of automobile combination meter power circuit stable output power to the MCU of instrument; ensure that instrument MCU is stable; and electrostatic protection can be provided to the power supply pin pin of combination instrument; and can ensure that instrument power can stand the impact of the voltage impulse in power supply and there will not be the situation of instrument function instability, ensure that the reliability of instrumentation.
The above is only the description of the preferred implementation of utility model; should be understood that; due to the finiteness of literal expression; and objectively there is unlimited concrete structure; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (6)
1. an automobile instrument power source circuit, is characterized in that: include low-dropout regulator, front filter circuit, post filtering circuit;
Described front filter circuit connects the input end of storage battery and described low-dropout regulator respectively; Described post filtering circuit connects the mouth of described low-dropout regulator;
Described front filter circuit includes the first electric capacity and high-power TVS pipe; Described first electric capacity is connected with described storage battery; Described high-power TVS pipe is arranged between described first electric capacity and described low-dropout regulator.
2. automobile instrument power source circuit according to claim 1, is characterized in that: described first electric capacity is 10 μ F/6kV electric capacity, carries out initial filter to described battery feed.
3. automobile instrument power source circuit according to claim 1, is characterized in that: described front filter circuit includes the second electric capacity, the 3rd electric capacity and the 4th electric capacity; Described second electric capacity, described 3rd electric capacity and described 4th electric capacity are set in turn between described first electric capacity and described low-dropout regulator; Described high-power TVS pipe is arranged between described first electric capacity and described second electric capacity; Described first electric capacity, described high-power TVS pipe, described second electric capacity, described 3rd electric capacity and described 4th Capacitance parallel connection are arranged.
4. automobile instrument power source circuit according to claim 1, is characterized in that: described post filtering circuit includes the 5th electric capacity, the 6th electric capacity and the 7th electric capacity; Described 5th electric capacity, described 6th electric capacity and described 7th Capacitance parallel connection are arranged.
5. automobile instrument power source circuit according to claim 3, is characterized in that: described front filter circuit includes the first rectifier diode.
6. automobile instrument power source circuit according to claim 4, is characterized in that: described post filtering circuit includes the second rectifier diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520869085.7U CN205059481U (en) | 2015-10-29 | 2015-10-29 | Motormeter power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520869085.7U CN205059481U (en) | 2015-10-29 | 2015-10-29 | Motormeter power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205059481U true CN205059481U (en) | 2016-03-02 |
Family
ID=55386074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520869085.7U Expired - Fee Related CN205059481U (en) | 2015-10-29 | 2015-10-29 | Motormeter power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205059481U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016110202A1 (en) * | 2016-06-02 | 2017-12-07 | Borgward Trademark Holdings Gmbh | Suppression device for a printed circuit board |
-
2015
- 2015-10-29 CN CN201520869085.7U patent/CN205059481U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016110202A1 (en) * | 2016-06-02 | 2017-12-07 | Borgward Trademark Holdings Gmbh | Suppression device for a printed circuit board |
| DE102016110202B4 (en) * | 2016-06-02 | 2020-02-13 | Borgward Trademark Holdings Gmbh | Interference suppressor for a printed circuit board |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Patentee after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Patentee before: Anhui Jianghuai Automobile Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160302 Termination date: 20191029 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |