CN209345012U - A kind of Width funtion protection circuit applied to automobile instrument - Google Patents
A kind of Width funtion protection circuit applied to automobile instrument Download PDFInfo
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- CN209345012U CN209345012U CN201920061060.2U CN201920061060U CN209345012U CN 209345012 U CN209345012 U CN 209345012U CN 201920061060 U CN201920061060 U CN 201920061060U CN 209345012 U CN209345012 U CN 209345012U
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Abstract
The utility model relates to a kind of Width funtions applied to automobile instrument to protect circuit, and constituting including DC-DC voltage conversion main control chip U1, input terminal and output end filter capacitor C1/C2/C5, the main loop circuit being made of R3/Q1/L1/D1, sampling resistor R1/R2/R4/R5/R7/R8 voltage sampling circuit, the capacitor C6 and R6 constituted is that U1 does the compensation circuit compensated.The utility model is applied in automobile instrument mould group, it is powered with on-vehicle battery, two kinds of standard power supplys of compatible vehicle-mounted DC12V and 24V convert the load that can be required into different voltages by DC-DC and provide reliable and stable power supply, and output voltage precision is high, stand-by power consumption is small.
Description
Technical field
The utility model relates to automobile instrument field, specially a kind of Width funtion applied to automobile instrument protects circuit.
Background technique
With the improvement of people's living standard in our country, automobile has become the necessity of each family.With playing industry
Development, people the comfort and entertainment of automobile are required it is higher and higher,
Vehicle-mounted electrical equipment is more and more and power is increasing.For automobile, all equipment power supplies are relied on
Vehicular accumulator cell will lead to on-vehicle battery voltage since equipment is more and have biggish fluctuation, will lead to the power supply of mobile unit
It exports unstable or does not work, seriously affect driving reliability and experience by bus, so how to design a kind of wide input voltage, height
The DC-DC circuit of precision output voltage is particularly important.At present in the industry often for one of electricity of DC12V or DC24V
Pressing type is designed DC-DC circuit, and output voltage precision is not high, requires when application to cell voltage, no
DC12V battery and the unified compatibility of DC24V battery can be come in, not only circuit is complicated, but also universal not strong.How one kind is passed through
Simple and reliable, high performance-price ratio circuit comes in DC12V battery and the unified compatibility of DC24V battery, and output voltage precision is high, at
For a hot spot of people's research.
Utility model content
To solve above-mentioned the technical problems existing in the prior art, the utility model provides a kind of applied to automobile instrument
Width funtion protect circuit.
To achieve the above object, the utility model provides the following technical solutions:
A kind of Width funtion protection circuit applied to automobile instrument, including DC-DC voltage convert main control chip U1, input terminal
With output end filter capacitor C1/C2/C5, capacitor C3/C4/C6, MOSFET pipe Q1, diode D1, inductance L1, resistance R1/R2/
R3/R4/R5/R6/R7/R8.It is characterized in that, 1 foot of the voltage conversion main control chip U1 is separately connected resistance R7, R8, electricity
The resistance R8 other end is connected to GND, and the resistance R7 other end is connected respectively to resistance R1/R3, capacitor C1/C2/C4, main control chip U1
13 feet, input power anode BAT+ (anode), 2 feet of main control chip U1 are connected respectively to resistance R4, R5, and resistance R5 is another
End is connected to GND, and 3 feet of main control chip U1 are being connected respectively to the other end of resistance R4, capacitor C5, inductance L1, out-put supply just
Pole Vout+, the capacitor C5 other end are connected to GND, and the inductance L1 other end is connected respectively to diode D1 cathode, the source MOSFET pipe Q1
Pole, diode D1 anode are connected with GND, and 4 feet of main control chip U1 are connected respectively to 5 feet, the GND of main control chip U1, master control core
6 feet of piece U1 are connected to resistance R2, and 7 feet of main control chip U1 are connected respectively to the other end of the other end of resistance R2, resistance R1,
8 feet of main control chip U1 are connected to capacitor C6, and the other end of capacitor C6 is connected to resistance R6, and the other end of resistance R6 is connected to
9 feet and 10 feet of GND, main control chip U1 do not define herein, and 11 feet of main control chip U1 are connected to the capacitor C4 other end, master control
12 feet of chip U1 are connected to MOSFET pipe Q1 grid, and 13 feet of main control chip U1 are connected to capacitor C3, the capacitor C3 other end and
GND connection, 14 feet of main control chip U1 respectively with MOSFET pipe Q1 drain electrode, the resistance R3 other end connect, the one end capacitor C1/C2 with
Input power anode BAT+ (anode) connection, the capacitor C1/C2 other end and input power cathode BAT- (battery cathode) are even
It connects, input power cathode BAT- and out-put supply cathode Vout- are connected respectively to GND.
As the utility model, further scheme, the main control chip U1 are turned using the dedicated DC-DC voltage of Infineon
Chip, such as, but not limited to model TLE6389-2GV are changed, MOSFET pipe Q1 selects P-channel model.
Compared with prior art, the utility model has the beneficial effects that the utility model is applied to the power supply of automobile instrument
Circuit, by the voltage of the 2 foot sampling feedback resistance R4/R5 of main control chip U1, the 12 feet output PWM for adjusting main control chip U1 is accounted for
Empty ratio realizes decompression principle by inductance L1 energy storage and diode D1 rectification, is subsequent to control MOSFET pipe Q1 switch
Load provides stable, high-precision voltage, and since the duty ratio adjustable extent that main control chip U1 is integrated is wide, can be wider
Input voltage (7-60VDC) work, and guarantee that output voltage stabilization is reliable, circuit structure is simple, technology maturation is reliable.
Detailed description of the invention
Fig. 1 is the circuit structure schematic diagram of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, a kind of Width funtion applied to automobile instrument of the utility model protects circuit.The voltage conversion
1 foot of main control chip U1 is separately connected resistance R7, R8, and the resistance R8 other end is connected to GND, and the resistance R7 other end is connected respectively to
Resistance R1/R3, capacitor C1/C2/C4,13 feet of main control chip U1, input power anode BAT+ (anode), main control chip U1
2 feet be connected respectively to resistance R4, R5, the resistance R5 other end is connected to GND, and 3 feet of main control chip U1 are connected respectively to resistance
The other end, capacitor C5, inductance L1, the out-put supply anode Vout+ of R4, the capacitor C5 other end are connected to GND, the inductance L1 other end
It is connected respectively to diode D1 cathode, MOSFET pipe Q1 source electrode, diode D1 anode is connected with GND, 4 feet point of main control chip U1
It is not connected to 5 feet, the GND of main control chip U1,6 feet of main control chip U1 are connected to resistance R2, and 7 feet of main control chip U1 connect respectively
It is connected to the other end of resistance R2, the other end of resistance R1,8 feet of main control chip U1 are connected to capacitor C6, the other end of capacitor C6
It is connected to resistance R6, the other end of resistance R6 is connected to GND, and 9 feet and 10 feet of main control chip U1 do not define herein, master control core
11 feet of piece U1 are connected to the capacitor C4 other end, and 12 feet of main control chip U1 are connected to MOSFET pipe Q1 grid, main control chip U1
13 feet be connected to capacitor C3, the capacitor C3 other end is connected with GND, 14 feet of main control chip U1 respectively with MOSFET pipe Q1 leak
Pole, the connection of the resistance R3 other end, the one end capacitor C1/C2 and input power anode BAT+ (anode) connection, capacitor C1/C2 is another
One end and input power cathode BAT- (battery cathode) connection, input power cathode BAT- and out-put supply cathode Vout- difference
It is connected to GND.
The main control chip U1 uses the dedicated DC-DC voltage conversion chip of Infineon, such as, but not limited to model
TLE6389-2GV, MOSFET pipe Q1 select P-channel model.
The main control chip U1 is the main logic unit of this circuit, circuit topology DC-DC BUCK circuit, the C1 of front end
High band filtering, C2 offer low-frequency range filtering are provided, the other equipment of power end is filtered out and is coupled into the high and low band interference come, be
The power supply of back-end circuit offer high quality.
When access power supply, power supply is given to the enabled foot 1 of main control chip U1 after divider resistance R7/R8, makes main control chip
U1 starts to work, and 7 feet of main control chip U1 detect supply voltage by divider resistance R1/R2, see whether need under-voltage protection from
And battery is protected, avoid over-discharge.The output voltage that 2 heels of main control chip U1 are sampled according to divider resistance R4/R5, according to
Computing circuit inside main control chip U1 calculates, and the PWM duty cycle of adjustment main control chip U112 foot output adjusts MOSFET pipe Q1
The turn-on and turn-off time provides load reliable and stable voltage through realizing to inductance L1 energy storage and rectifier diode.The circuit
It can work at wider input voltage (7-60VDC), cover automobile-used DC12V and DC24V size battery.It can also be according to each
Kind output voltage requirement, adjusts divider resistance R4/R5 resistance value to realize different voltage outputs.C5 is as storage capacitor, when having
Afterflow can be provided for load when heavy duty start and stop, power supply is avoided to have biggish fluctuation, to avoid the EMI of low frequency dry
It disturbs.
For the ordinary skill in the art, it is clear that the utility model is not limited to the thin of above-mentioned exemplary embodiment
Section, and without departing substantially from the spirit or essential attributes of the utility model, this can be realized in other specific forms
Utility model.Therefore, no matter from the point of view of that point, embodiment should all be encouraged and regard exemplary as, and be non-limiting, this
The range of utility model is indicated by the appended claims rather than the foregoing description, it is intended that wanting on an equal basis for claim will be fallen in
All changes in the meaning and scope of part are embraced therein.It should not be by any appended drawing reference in claim
It is construed as limiting the claims involved.
Furthermore it should be appreciated that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (1)
1. a kind of Width funtion applied to automobile instrument protects circuit, including DC-DC voltage conversion main control chip U1, input terminal and
Output end filter capacitor C1/C2/C5, capacitor C3/C4/C6, MOSFET pipe Q1, diode D1, inductance L1, resistance R1/R2/R3/
R4/R5/R6/R7/R8；It is characterized in that, 1 foot of the voltage conversion main control chip U1 is separately connected resistance R7, R8, resistance R8
The other end is connected to GND, the resistance R7 other end be connected respectively to resistance R1/R3, capacitor C1/C2/C4, main control chip U1 13
Foot, input power anode BAT+ (anode), 2 feet of main control chip U1 are connected respectively to resistance R4, R5, the resistance R5 other end
It is connected to GND, 3 feet of main control chip U1 are connected respectively to the other end of resistance R4, capacitor C5, inductance L1, out-put supply anode
Vout+, the capacitor C5 other end are connected to GND, and the inductance L1 other end is connected respectively to diode D1 cathode, the source MOSFET pipe Q1
Pole, diode D1 anode are connected with GND, and 4 feet of main control chip U1 are connected respectively to 5 feet, the GND of main control chip U1, master control core
6 feet of piece U1 are connected to resistance R2, and 7 feet of main control chip U1 are connected respectively to the other end of the other end of resistance R2, resistance R1,
8 feet of main control chip U1 are connected to capacitor C6, and the other end of capacitor C6 is connected to resistance R6, and the other end of resistance R6 is connected to
11 feet of GND, main control chip U1 are connected to the capacitor C4 other end, and 12 feet of main control chip U1 are connected to MOSFET tube grid, main
13 feet of control chip U1 are connected to capacitor C3, and the capacitor C3 other end is connected with GND, and 14 feet of main control chip U1 are respectively and MOSFET
Pipe Q1 drain electrode, the connection of the resistance R3 other end, the one end capacitor C1/C2 are connected with input power anode BAT+, the capacitor C1/C2 other end
It is connected with input power cathode BAT-, input power cathode BAT- and out-put supply cathode Vout- are connected respectively to GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920061060.2U CN209345012U (en) | 2019-01-15 | 2019-01-15 | A kind of Width funtion protection circuit applied to automobile instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920061060.2U CN209345012U (en) | 2019-01-15 | 2019-01-15 | A kind of Width funtion protection circuit applied to automobile instrument |
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| Publication Number | Publication Date |
|---|---|
| CN209345012U true CN209345012U (en) | 2019-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920061060.2U Active CN209345012U (en) | 2019-01-15 | 2019-01-15 | A kind of Width funtion protection circuit applied to automobile instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078818A (en) * | 2021-04-29 | 2021-07-06 | 宁波三星医疗电气股份有限公司 | Isolated double-output DC-DC power supply and industrial control equipment |
-
2019
- 2019-01-15 CN CN201920061060.2U patent/CN209345012U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078818A (en) * | 2021-04-29 | 2021-07-06 | 宁波三星医疗电气股份有限公司 | Isolated double-output DC-DC power supply and industrial control equipment |
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