CN106787684A - A kind of automobile instrument power source circuit - Google Patents
A kind of automobile instrument power source circuit Download PDFInfo
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- CN106787684A CN106787684A CN201710041544.6A CN201710041544A CN106787684A CN 106787684 A CN106787684 A CN 106787684A CN 201710041544 A CN201710041544 A CN 201710041544A CN 106787684 A CN106787684 A CN 106787684A
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- 238000001914 filtration Methods 0.000 claims abstract description 12
- 230000009467 reduction Effects 0.000 claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 29
- 230000001052 transient effect Effects 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 10
- 230000001629 suppression Effects 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
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Abstract
The present invention relates to a kind of automobile instrument power source circuit, it includes：For being filtered to the 12V power supplys that power supply is exported by high current common mode inductance, and the reduction electromagnetic interference filter circuit that filtered 12V power supplys are exported；For carrying out initial filter to the 12V power supplys for exporting, 12V voltage-stabilized power supplies and the preceding filter circuit for exporting are obtained；In the low pressure difference linearity voltage-stabilized power supply circuit that the 12V voltage-stabilized power supplies exported after the initial filter are converted into 5V power supplys and output；And for being filtered again to the 5V power supplys for exporting, obtain 5V stabilized power sources and the post filtering circuit for exporting, it can be reduced because of the Conduction Interference that power supply noise is produced during battery 12V power supplys are directly changed into 5V power supplys, meet requirement of the electromagnetic compatibility test for liquid crystal instrument for automobile, increase the percent of pass of EMC tests, it is cost-effective.
Description
Technical field
The present invention relates to a kind of power circuit field, more particularly to a kind of liquid crystal instrument for automobile power circuit.
Background technology
As shown in figure 1, existing automobile combination meter power supply is 12V battery feeds, and the MCU of inside and other parts
Component operating voltage is 5V, and power circuit is by preceding filter circuit, low pressure difference linearity voltage-stabilized power supply circuit, post filtering circuit will
The 12V power conversions of battery are the power supply of 5V, so that MCU and other components are used.
But the 12V power supplys of battery are connected into automobile instrument circuit directly carries out 12V electricity by low pressure difference linearity voltage stabilizing
During power circuit turns 5V power supplys, transient noise interference can be produced because of power supply noise during Switching Power Supply, its rate of climb is fast,
Duration is short, voltage amplitude panel height, and randomness is strong, and severe jamming is produced to circuit, causes the EMC of automobile instrument to test percent of pass
Low, further the quality to automobile instrument has a negative impact.
Therefore, it is necessary to provide a kind of new power circuit, battery 12V power supplys can directly changed into 5V power supplys by it
During reduce because power supply noise produce Conduction Interference, meet requirement of the electromagnetic compatibility test for liquid crystal instrument for automobile,
Increase the percent of pass of EMC tests, it is cost-effective.
The content of the invention
For above-mentioned problems of the prior art, the invention provides a kind of automobile instrument power source circuit, it can be with
Reduced during battery 12V power supplys are directly changed into 5V power supplys because of the Conduction Interference that power supply noise is produced, meet electromagnetism
Compatibility test increases the percent of pass of EMC tests for the requirement of liquid crystal instrument for automobile, cost-effective.
The technical scheme that the present invention is proposed with regard to above-mentioned technical problem is as follows：
A kind of automobile instrument power source circuit is provided, it includes：
Reduce electromagnetic interference filter circuit, its one end connection 12V power output ends, for by high current common mode inductance pair
The 12V power supplys of power supply output are filtered, and filtered 12V power supplys are exported；
Preceding filter circuit, its described reduction electromagnetic interference filter circuit of connection, for being carried out initially to the 12V power supplys for exporting
Filtering, obtains 12V voltage-stabilized power supplies and exports；
Low pressure difference linearity voltage-stabilized power supply circuit, its described preceding filter circuit of connection, for will be defeated after the initial filter
The 12V voltage-stabilized power supplies for going out are converted into 5V power supplys and export；
And post filtering circuit, its described low pressure difference linearity voltage-stabilized power supply circuit of connection, for entering to the 5V power supplys for exporting
Row is filtered again, is obtained 5V stabilized power sources and is exported.
Preferably, the reduction electromagnetic interference filter circuit includes：
Counnter attack circuit unit, its input connects the power output end, for anti-reverse；
Transient state suppresses unit, and its input connects the output end of the counnter attack circuit unit, its output head grounding, for preventing
Reversal connection；
High current common mode inductance, it is used to be filtered the 12V power supply noises of power supply output；The high current is total to
The output end and the transient state that mould inductance first input end and the second input connect the counnter attack circuit unit respectively suppress
The output end of unit；12V power supplys after the first output end output of the high current common mode inductance is filtered, the second output termination
Ground.
Preferably, the output end of the counnter attack circuit unit also connects the input of a NC resistance, and NC electricity
First output end of the output termination high current common mode inductance of resistance；The output end that the transient state suppresses unit also meets the 2nd NC
Resistance, and the output termination high current common mode inductance of the 2nd NC resistance the second output end.
Preferably, the counnter attack circuit unit is S3D diodes；It is TVS diode that the transient state suppresses unit；It is described big
Electric current common mode inductance is TLDCM7978-2-501TF common mode inductances；
The positive pole of the S3D diodes connects the power output end, negative pole connect respectively the negative pole end of the TVS diode with
And the first input end of TLDCM7978-2-501TF common mode inductances；
The positive terminal of the TVS diode is grounded and connects the second of the TLDCM7978-2-501TF common mode inductances respectively
Input.
Preferably, the low pressure difference linearity voltage-stabilized power supply circuit includes MPQ4423H voltage stabilizing chips；
The preceding filter circuit includes：
First polar capacitor, the second electric capacity, the 3rd electric capacity, the 4th electric capacity in parallel, and first polar capacitor, second
Electric capacity, the 3rd electric capacity, the input of the 4th electric capacity reduce the filtered 12V power supplys phase of electromagnetic interference filter circuit with through described
Even, for carrying out initial filter through the reduction filtered 12V power supplys of electromagnetic interference filter circuit；The first polarity electricity
Hold, the IN pins of the second electric capacity, the 3rd electric capacity, the output end of the 4th electric capacity with the MPQ4423H voltage stabilizing chips are connected, use
The MPQ4423H voltage stabilizing chips are input into the 12V voltage-stabilized power supplies that will be obtained after initial filter；
The input of the second resistance after first resistor and the second resistance connected with the first resistor, and series connection
Connect the EN/SYNC pins of the MPQ4423H voltage stabilizing chips, the output termination ground connection of the first resistor；The first resistor and
Second resistance is used to carry out current limliting to the output of the EN/SYNC；
3rd resistor, its input connects the VCC pin of the MPQ4423H voltage stabilizing chips；
5th electric capacity, its input connects the output end and the MPQ4423H voltage stabilizing chips of the 3rd resistor respectively
PG pins, its output head grounding；The 3rd resistor and the 5th electric capacity are used to filter the VCC pin and PG pins
Ripple and open-drain output.
Preferably, the post filtering circuit includes：
4th resistance, its input is connected with the BST pins of the MPQ4423H voltage stabilizing chips；
6th electric capacity, its input and the 4th resistant series；
First inductance, its input connects the SW pins and the 6th electric capacity of the MPQ4423H voltage stabilizing chips respectively
Output end；
4th resistance and the 6th electric capacity are used to reduce the peak voltage of the BST outputs；First inductance is used
It is filtered in the voltage to being exported through the 4th resistance and the 6th electric capacity；
5th resistance, the 6th resistance and the 7th resistance, the input of the 5th resistance connect the MPQ4423H voltage stabilizings
The FB pins of chip, its output end connects the input of the 6th resistance and the 7th resistance, the output of the 6th resistance respectively
End connects the output end of first inductance；The output head grounding of the 7th resistance；
And the 7th electric capacity of parallel connection, the 8th electric capacity, the 9th electric capacity and electrochemical capacitor, the 7th electric capacity, the 8th electric capacity,
The input of the 9th electric capacity and electrochemical capacitor is all connected with the output end of first inductance, for being exported through first inductance
5V power supplys filter again, obtain the 5V stabilized power sources and export.
Preferably, first inductance is SLF7045T inductance.
Preferably, also including voltage verification circuit, it includes：
Light emitting diode, its input connection the 7th electric capacity in parallel, the 8th electric capacity, the 9th electric capacity and electrochemical capacitor
Output end, for verify output 5V stabilized power sources it is whether normal；
And the 8th resistance, its input connects the output end of the light emitting diode, for current limliting.
Technical scheme has the following technical effect that：
The present invention can be reduced because of power supply noise generation during battery 12V power supplys are directly changed into 5V power supplys
Conduction Interference, meets requirement of the electromagnetic compatibility test for liquid crystal instrument for automobile, increases the percent of pass of EMC tests, cost-effective.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for embodiment description
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the circuit diagram of existing automobile instrument power source circuit of the invention；
Fig. 2 is the circuit diagram of reduction electromagnetic interference filter circuit in the embodiment of the present invention one；
Fig. 3 is the electricity of automobile instrument power source circuit (not comprising electromagnetic interference filter circuit is reduced) in the embodiment of the present invention one
Lu Tu.
Specific embodiment
The present invention for existing automobile instrument power source circuit by the 12V Power converts of battery into 5V power supplys process
In, because power supply noise produces transient noise interference during Switching Power Supply, cause to circuit serious interference, and cause automobile instrument
The low defect of EMC test percent of pass, there is provided a kind of new automobile instrument power source circuit, it can be straight by battery 12V power supplys
Reduced during switching through into 5V power supplys because of the Conduction Interference that power supply noise is produced, meet electromagnetic compatibility test for liquid crystal automobile
The requirement of instrument, increases the percent of pass of EMC tests, cost-effective.
Embodiment one：
As Figure 2-3, automobile instrument power source circuit of the invention includes：
Reduce electromagnetic interference filter circuit, its one end connection 12V power output end EXT BAT, for common by high current
Mould inductance is filtered to the 12V power supplys that power supply is exported, and filtered 12V power supplys DVDD_12VP is exported；
Preceding filter circuit, its described reduction electromagnetic interference filter circuit of connection, for being carried out initially to the 12V power supplys for exporting
Filtering, obtains 12V voltage-stabilized power supplies and exports；
Low pressure difference linearity voltage-stabilized power supply circuit, its described preceding filter circuit of connection, for will be defeated after the initial filter
The 12V voltage-stabilized power supplies for going out are converted into 5V power supplys DVDD_5V and export；
And post filtering circuit, its described low pressure difference linearity voltage-stabilized power supply circuit of connection, for entering to the 5V power supplys for exporting
Row is filtered again, is obtained 5V stabilized power sources and is exported.
Wherein, the reduction electromagnetic interference filter circuit includes：
Counnter attack circuit unit D2, its input connects the power output end EXT_BAT, for anti-reverse；Preferably, institute
Counnter attack circuit unit D2 is stated for S3D diodes, its maximum is 3A by electric current, and voltage is 1.2V, and backward voltage is 100V；
Transient state suppresses cells D 3, and its input connects the output end of the counnter attack circuit unit D2, its output end EXT_GND
Ground connection, for anti-reverse；It is TVS diode that the transient state suppresses cells D 3.TVS(Transient Voltage
Suppressor) diode, is also called Transient Suppression Diode, is a kind of new and effective circuit brake for commonly using,
It has the response time (subnanosecond level) and at a relatively high surge absoption ability being exceedingly fast.When the high energy of moment is undergone at its two ends
During stroke, the impedance value between two ends can be changed into Low ESR by TVS with high speed from high impedance, big to absorb a moment
Electric current, so as to its both end voltage strangulation one it is predetermined numerically, so as to protect circuit element below not receive transient state
The impact of high voltage spikes.Particularly preferred in the present embodiment, the TVS diode is 8KP36A diodes, and it is maximum steady
Pressure value is 36V, and power is 8000W.
High current common mode inductance L2, it is used to be filtered the 12V power supply noises of power supply output；The high current
Common mode inductance L2 first input ends 1 and the second input 2 connect the output end of the counnter attack circuit unit D2 and described respectively
Transient state suppresses the output end of cells D 3；First output end 4 of the high current common mode inductance L2 export it is filtered after 12V electricity
Source, the second output end 3 is grounded.
Preferably, the output end of the counnter attack circuit unit D2 also connects the input of a NC (no connect) resistance R9
End, and the output termination high current common mode inductance L2 of the NC resistance R9 the first output end 4；The transient state suppresses
The output end of cells D 3 also meets the 2nd NC (no connect) resistance R10, and the output termination of the 2nd NC resistance R10 is described
Second output end 3 of high current common mode inductance L2.By setting a NC resistance R9 and the 2nd NC resistance R10 come for follow-up
Modification leaves leeway.
Preferably, the high current common mode inductance L2 is entered using TLDCM7978-2-501TF common mode inductances to power supply noise
Row filtering, enables conduction test to pass through.
When the counnter attack circuit unit is S3D diodes；It is TVS diode that the transient state suppresses unit；The high current
When common mode inductance is TLDCM7978-2-501TF common mode inductances, the positive pole of the S3D diodes connects the power output end, bears
Pole connects the negative pole end of the TVS diode and the first input end of TLDCM7978-2-501TF common mode inductances respectively；It is described
The positive terminal of TVS diode is grounded and connects the second input of the TLDCM7978-2-501TF common mode inductances respectively.
Further, the low pressure difference linearity voltage-stabilized power supply circuit includes MPQ4423H voltage stabilizing chips；The MPQ4423H
Voltage stabilizing chip includes eight pins of IN, FB, EN/SYNC, VCC, PG, BST, SW and GND, and it can play high-frequency synchronous rectification
The effect of step-down switching conversion；The function of above-mentioned each pin is same as the prior art, will not be repeated here；
The preceding filter circuit includes：
First polar capacitor C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 in parallel, and first polarity
Electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 input with through the reduction electromagnetic interference filter circuit
Filtered 12V power supplys DVDD_12VP is connected, for through the reduction filtered 12V power supplys of electromagnetic interference filter circuit
DVDD_12VP carries out initial filter；The first polar capacitor C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 it is defeated
Go out IN pin of the end with the MPQ4423H voltage stabilizing chips to be connected, for the 12V voltage-stabilized power supplies that will be obtained after initial filter
It is input into the MPQ4423H voltage stabilizing chips；In the present embodiment, the first polar capacitor C1 values are 220 μ F/35V, the second electric capacity C2
Value is 2.2 μ F/50V, and the 3rd electric capacity C3 values are 2.2 μ F/50V, and the 4th electric capacity C4 values are 0.1nF.
The second resistance R2 after the first resistor R1 and second resistance R2 connected with the first resistor R1, and series connection
The input termination MPQ4423H voltage stabilizing chips EN/SYNC pins, the output termination ground connection of the first resistor R1；It is described
The resistance of first resistor R1 and second resistance R1 is respectively 8-12k and 1.5-3k, particularly preferred, the first resistor R1 and
The resistance of two resistance R1 is respectively 10k and 2k；The first resistor R1 and second resistance R1 is used for the EN/SYNC's
Output carries out current limliting；
3rd resistor R3, its input connects the VCC pin of the MPQ4423H voltage stabilizing chips；The 3rd resistor R3's
Resistance is 80-120k, particularly preferably 100k；
5th electric capacity C5, its input connects the output end of the 3rd resistor R3 and the MPQ4423H voltage stabilizings respectively
The PG pins of chip, its output head grounding, the value of the 5th electric capacity C5 is 0.1 μ F；The 3rd resistor R3 and the 5th
Electric capacity C5 is used to be filtered and open-drain output the VCC pin and PG pins.
Further, the post filtering circuit includes：
4th resistance R4, its input is connected with the BST pins of the MPQ4423H voltage stabilizing chips；The 4th resistance R4
Resistance be 18-24k, preferably 22k；
6th electric capacity C6, its input and the 4th resistant series；The value of the 6th electric capacity C6 is 0.1 μ F；
First inductance L1, its input connects the SW pins and the 6th electricity of the MPQ4423H voltage stabilizing chips respectively
Hold the output end of C6；The first inductance L1 is preferably SLF7045T inductance；
The 4th resistance R4 and the 6th electric capacity C6 is used to reduce the peak voltage of the BST outputs；First electricity
Sense L1 is used to be filtered the voltage exported through the 4th resistance R4 and the 6th electric capacity C6；
5th resistance R5, the 6th resistance R6 and the 7th resistance R7, the input connection of the 5th resistance R5 are described
The FB pins of MPQ4423H voltage stabilizing chips, its output end connects the input of the 6th resistance R6 and the 7th resistance R7, institute respectively
The output end for stating the 6th resistance R6 connects the output end of the first inductance L1；The output head grounding of the 7th resistance R7；
And the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 and electrochemical capacitor EC1 of parallel connection, the 7th electric capacity
C7, the 8th electric capacity C8, the input of the 9th electric capacity C9 and electrochemical capacitor EC1 are all connected with the output end of the first inductance L1, use
Filtered again in the 5V power supplys exported through the first inductance L1, obtain the 5V stabilized power sources DVDD_5V and export.
Preferably, the 7th electric capacity C7, the 8th electric capacity C8, the value of the 9th electric capacity C9 and electrochemical capacitor EC1 are respectively
It is 100 μ F/16V, 10 μ F/16V, 0.1 μ F and 100 μ F/16V.
Further, the automobile instrument power source circuit also includes voltage verification circuit, and it includes：
LED _ 5V, the connection of its input the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity in parallel
Whether the output end of C9 and electrochemical capacitor EC1, the 5V stabilized power sources DVDD_5V for verifying output is normal；
And the 8th resistance R8, its input connects the output end of the LED _ 5V, for current limliting, its resistance
It is 1.5-2.5k to be worth, preferably 2k.
In sum, technical scheme can the present invention battery 12V power supplys can directly changed into 5V power supplys
During reduce because power supply noise produce Conduction Interference, meet requirement of the electromagnetic compatibility test for liquid crystal instrument for automobile,
Increase the percent of pass of EMC tests, it is cost-effective.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (8)
1. a kind of automobile instrument power source circuit, it is characterised in that including：
Reduce electromagnetic interference filter circuit, its one end connection 12V power output ends, for by high current common mode inductance to power supply
The 12V power supplys of output are filtered, and filtered 12V power supplys are exported；
Preceding filter circuit, its described reduction electromagnetic interference filter circuit of connection, for initially being filtered to the 12V power supplys for exporting
Ripple, obtains 12V voltage-stabilized power supplies and exports；
Low pressure difference linearity voltage-stabilized power supply circuit, its described preceding filter circuit of connection, for will be exported after the initial filter
12V voltage-stabilized power supplies are converted into 5V power supplys and export；
And post filtering circuit, its described low pressure difference linearity voltage-stabilized power supply circuit of connection, for being carried out again to the 5V power supplys for exporting
Secondary filtering, obtains 5V stabilized power sources and exports.
2. circuit as claimed in claim 1, it is characterised in that the reduction electromagnetic interference filter circuit includes：
Counnter attack circuit unit, its input connects the power output end, for anti-reverse；
Transient state suppresses unit, and its input connects the output end of the counnter attack circuit unit, its output head grounding, for counnter attack
Connect；
High current common mode inductance, it is used to be filtered the 12V power supply noises of power supply output；The high current common mode electricity
The output end and the transient state that sense first input end and the second input connect the counnter attack circuit unit respectively suppress unit
Output end；12V power supplys after the first output end output of the high current common mode inductance is filtered, the second output head grounding.
3. circuit as claimed in claim 2, it is characterised in that the output end of the counnter attack circuit unit also connects a NC resistance
Input, and the output termination high current common mode inductance of a NC resistance the first output end；The transient state suppression
The output end of unit processed also connects the 2nd NC resistance, and the output termination high current common mode inductance of the 2nd NC resistance the
Two output ends.
4. circuit as claimed in claim 2, it is characterised in that the counnter attack circuit unit is S3D diodes；The transient state suppression
Unit processed is TVS diode；The high current common mode inductance is TLDCM7978-2-501TF common mode inductances；
The positive pole of the S3D diodes connects the power output end, negative pole connect respectively the TVS diode negative pole end and
The first input end of TLDCM7978-2-501TF common mode inductances；
The positive terminal of the TVS diode is grounded and connects the second input of the TLDCM7978-2-501TF common mode inductances respectively
End.
5. circuit as claimed in claim 1, it is characterised in that the low pressure difference linearity voltage-stabilized power supply circuit includes MPQ4423H
Voltage stabilizing chip；
The preceding filter circuit includes：
First polar capacitor, the second electric capacity, the 3rd electric capacity, the 4th electric capacity in parallel, and first polar capacitor, the second electricity
Appearance, the input of the 3rd electric capacity, the 4th electric capacity reduce the filtered 12V power supplys phase of electromagnetic interference filter circuit with through described
Even, for carrying out initial filter through the reduction filtered 12V power supplys of electromagnetic interference filter circuit；The first polarity electricity
Hold, the IN pins of the second electric capacity, the 3rd electric capacity, the output end of the 4th electric capacity with the MPQ4423H voltage stabilizing chips are connected, use
The MPQ4423H voltage stabilizing chips are input into the 12V voltage-stabilized power supplies that will be obtained after initial filter；
The input termination institute of the second resistance after first resistor and the second resistance connected with the first resistor, and series connection
State the EN/SYNC pins of MPQ4423H voltage stabilizing chips, the output termination ground connection of the first resistor；The first resistor and second
Resistance is used to carry out current limliting to the output of the EN/SYNC；
3rd resistor, its input connects the VCC pin of the MPQ4423H voltage stabilizing chips；
5th electric capacity, its input connects the output end of the 3rd resistor and the PG of the MPQ4423H voltage stabilizing chips respectively
Pin, its output head grounding；The 3rd resistor and the 5th electric capacity be used to being filtered the VCC pin and PG pins and
Open-drain output.
6. circuit as claimed in claim 5, it is characterised in that the post filtering circuit includes：
4th resistance, its input is connected with the BST pins of the MPQ4423H voltage stabilizing chips；
6th electric capacity, its input and the 4th resistant series；
First inductance, its input connect respectively the MPQ4423H voltage stabilizing chips SW pins and the 6th electric capacity it is defeated
Go out end；
4th resistance and the 6th electric capacity are used to reduce the peak voltage of the BST outputs；It is right that first inductance is used for
The voltage exported through the 4th resistance and the 6th electric capacity is filtered；
5th resistance, the 6th resistance and the 7th resistance, the input of the 5th resistance connect the MPQ4423H voltage stabilizing chips
FB pins, its output end connects the input of the 6th resistance and the 7th resistance respectively, and the output end of the 6th resistance connects
The output end of first inductance；The output head grounding of the 7th resistance；
And the 7th electric capacity of parallel connection, the 8th electric capacity, the 9th electric capacity and electrochemical capacitor, the 7th electric capacity, the 8th electric capacity, the 9th
The input of electric capacity and electrochemical capacitor is all connected with the output end of first inductance, for the 5V to being exported through first inductance
Power supply is filtered again, is obtained the 5V stabilized power sources and is exported.
7. circuit as claimed in claim 6, it is characterised in that first inductance is SLF7045T inductance.
8. circuit as claimed in claim 6, it is characterised in that also including voltage verification circuit, it includes：
Light emitting diode, its input connects the defeated of the 7th electric capacity in parallel, the 8th electric capacity, the 9th electric capacity and electrochemical capacitor
Go out end, whether the 5V stabilized power sources for verifying output are normal；
And the 8th resistance, its input connects the output end of the light emitting diode, for current limliting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710041544.6A CN106787684A (en) | 2017-01-20 | 2017-01-20 | A kind of automobile instrument power source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710041544.6A CN106787684A (en) | 2017-01-20 | 2017-01-20 | A kind of automobile instrument power source circuit |
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| Publication Number | Publication Date |
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| CN106787684A true CN106787684A (en) | 2017-05-31 |
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| CN201710041544.6A Pending CN106787684A (en) | 2017-01-20 | 2017-01-20 | A kind of automobile instrument power source circuit |
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| CN (1) | CN106787684A (en) |
Cited By (4)
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| CN107742981A (en) * | 2017-08-02 | 2018-02-27 | 宁德时代新能源科技股份有限公司 | Low-voltage power supply circuit, battery sampling unit and vehicle power supply battery |
| CN107968562A (en) * | 2017-12-25 | 2018-04-27 | 广州市熙泰自控设备有限公司 | A kind of intrinsic safety isolated form transmitter |
| CN111030445A (en) * | 2018-10-09 | 2020-04-17 | 西安智盛锐芯半导体科技有限公司 | Voltage conversion circuit with multiple power supply interfaces adapted |
| CN112578210A (en) * | 2020-12-11 | 2021-03-30 | 上海伟世通汽车电子系统有限公司 | Method for manufacturing instrument panel power interface circuit |
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Cited By (4)
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| CN107742981A (en) * | 2017-08-02 | 2018-02-27 | 宁德时代新能源科技股份有限公司 | Low-voltage power supply circuit, battery sampling unit and vehicle power supply battery |
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| CN111030445A (en) * | 2018-10-09 | 2020-04-17 | 西安智盛锐芯半导体科技有限公司 | Voltage conversion circuit with multiple power supply interfaces adapted |
| CN112578210A (en) * | 2020-12-11 | 2021-03-30 | 上海伟世通汽车电子系统有限公司 | Method for manufacturing instrument panel power interface circuit |
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Application publication date: 20170531 |