CN110165881A - Vehicle power supply detection and rear dress equipment protection circuit - Google Patents
Vehicle power supply detection and rear dress equipment protection circuit Download PDFInfo
- Publication number
- CN110165881A CN110165881A CN201910520978.3A CN201910520978A CN110165881A CN 110165881 A CN110165881 A CN 110165881A CN 201910520978 A CN201910520978 A CN 201910520978A CN 110165881 A CN110165881 A CN 110165881A
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- Prior art keywords
- circuit
- power supply
- vehicle power
- supply detection
- voltage
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 claims abstract description 12
- 230000005611 electricity Effects 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 5
- 238000004146 energy storage Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000006837 decompression Effects 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of vehicle power supply detection and rear dress equipment protection circuit; including sequentially connected surging protection circuit, two parallel voltage collection circuits, output control circuit, the fixed 12V output circuit of DCDC, described two parallel voltage collection circuits are 12V voltage collection circuit and 24V voltage collection circuit.Voltage collection circuit samples battery power system, protects storage battery, protects rear end power supply circuit by decompression and carrying out surge protection.The present invention can adapt to 12V and 24V power supply automatically, improve switching efficiency, reduce conversion cost.
Description
Technical field
The present invention relates to one kind to be suitable under engineering mechanical device battery voltage system, accomplishes that 12V and 24V voltage is adaptive
It answers, and the power protecting circuit of power supply and the protection to other 12V equipment of rear dress, is detected more particularly, to a kind of vehicle power supply
And rear dress equipment protection circuit.
Background technique
Auxiliary level on engineering mechanical device be powered with 12V and 24V, but it is some after fill ancillary equipment, have
May because engineering machine vehicle work when output heavy current when or higher transient voltage.If being followed by electrical equipment without protecting
If shield and be possible to because electric current cross or voltage greatly caused by equipment damage.Installing after most engineering machine vehicles standby is all 12V power supply
, therefore need on 24V engineering machine vehicle the power supply of a 12V voltage.
Summary of the invention
The present invention provides a kind of detection of vehicle power supply and rear dress equipment protection circuits, and it is adaptive to solve 12V and 24V power supply
The problem of answering, it is described that its technical solution is as follows:
A kind of detection of vehicle power supply and rear dress equipment protection circuit, including sequentially connected surging protection circuit, two simultaneously
The fixed 12V output circuit of capable voltage collection circuit, output control circuit, DCDC, described two parallel voltage collection circuits
For 12V voltage collection circuit and 24V voltage collection circuit.
Surging protection circuit includes that the self- recoverage insurance F1 of front end and TVS the protection diode D2, TVS of rear end protect two poles
After pipe D2 is in parallel with two capacitors, then F1 is insured with self- recoverage and is connected.
F1 is wink thunder k60-500,60v-5A self-recovery fuse.
Voltage collection circuit uses chip MC3316DR2.
The fixed 12V output circuit of DCDC uses TPS54340DDA chip.
4 foot RT/CLK foot control Frequency Design feet of chip, external 200K Ω resistance, so that DC-DC chip operation
In fixed frequency 500kHz.
The rear end of the fixed 12V output circuit of DCDC is connected with inductance L1 and diode D1, respectively as energy storage inductor and continues
Diode is flowed, provides follow current in mos pipe closure.
The vehicle power supply detection and rear dress equipment protection circuit can adapt to 12V and 24V power supply automatically, improve switching effect
Rate reduces conversion cost.
Detailed description of the invention
Fig. 1 is the circuit model schematic of the vehicle power supply detection and rear dress equipment protection circuit；
Fig. 2 is the logic control chart for inhibiting surge；
Fig. 3 is circuit diagram of the invention；
Fig. 4 is 12V voltage sample and control circuit schematic diagram；
Fig. 5 is the circuit diagram of self- recoverage insurance.
Specific embodiment
The vehicle power supply detection and rear dress equipment protection circuit can protect the vehicle power supply of engineering machine vehicle, Yi Jiqi
It relies on the mobile unit of vehicle power supply power supply.The storage battery over-discharge of vehicle power supply can be protected, protection mobile unit prevents moment electric
It is impacted caused by the surge of the excessive generation of road electric current, also there is DCDC buck functionality.
As shown in Figure 1, vehicle power supply detection and rear dress equipment protection circuit include:
Circuit surge protection circuit, voltage collection circuit, output control, the fixed 12V output circuit of DCDC, can know automatically
Other input voltage: 12V and 24V.Voltage collection circuit includes voltage collection circuit 1 and voltage collection circuit 2, by defeated after acquisition
It controls again through 12V output circuit, is exported out.
In this way, being first connected to " carrying out surge protection " after plant-grid connection, at progress " voltage acquisition ", the purpose of acquisition has 2: one
Purpose is identification power-supply system, is 12v system or 24v system.
The present invention can also judge input voltage value what range (range include: 12v system include < 11.5V or
Between 11.5V-14.9V or between 15V-23.5V or between 23.5v-42V, or it is greater than 42V).By where judging voltage
Range, Lai Shixian " output control ", controls the output of DCDC.Specific output control be detection voltage 11.5V-14.9V it
Between between 23.5V-42V, just give rear end DCDC circuit enable signal, rear end 12v output.After being controlled under other range of voltages
End DCDC is not exported.
As shown in Fig. 2, using voltage sampling circuit: installing available electricity convenient for identification 12V power supply and 24V power supply, after accomplishing
Adaptively.Decompression processing is carried out to 24V voltage using DC-DC circuit, can be realized output voltage 12V, the electricity of electric current maximum 3A
Available electricity is installed in source after giving.Using the cooperation of self- recoverage insurance F1 and TVS protection diode D2, for using the wave of middle generation
Capable processing of releasing is poured into, to protect back-end circuit not to be damaged.The wherein F1 and D2 cooperation, can effectively inhibit surge.
The present invention can be realized carrying out surge protection: insure F1 and TVS protection diode D2's by self- recoverage shown in Fig. 3
It is excessive or can be realized and reach P5A waveform under ISO7637-2 standard (pressure of maximum 24V base, arteries and veins to can be realized electric current for cooperation
Rush voltage 174V, pulse width 350ms, 4 ohm of internal resistance) 10 impacts and protection.It also can be to by back-end circuit or front end
Power supply damages the influence for being unlikely to cause between front and back suddenly.
Using the cooperation of self- recoverage insurance F1 and TVS protection diode D2, for using the surge of middle generation to release
Processing, to protect back-end circuit not to be damaged.F1 is wink thunder k60-500,60v-5A self-recovery fuse, in circuit because of wave
It gushes, when the factors such as short circuit cause electric current moment excessive, self-recovery fuse is because overheat can interrupt, after electric current recovery, fuse
Restoring circuit works normally.
TVS uses wink thunder LCT40B Transient Suppression Diode, plays elimination surge by the two cooperation, protects the work of circuit
With.
Logic control chart of the present invention is as shown in Figure 3:
Voltage collection circuit: 12V voltage is acquired by the bleeder circuit that U2 and R8, R9, R10 are formed；By U3,
24V voltage is acquired with R12, R13, R14 bleeder circuit formed.
Input voltage U2 in 11.4V-14.9V collects voltage, exports high level, control U1 is worked normally, lower than electricity
When the 11.4V of source, U2 collects voltage, exports low level, and DC-DC stops working, plays and protect 12V storage battery not over-discharge.
By the way that based on U1, the DC-DC reduction voltage circuit that surrounding other devices are combined into guarantees input voltage in 11.5V-
11V-12V is exported when 14.9V (to depend on the circumstances, output 12V input voltage is defeated in 11.5V-12.5V when voltage is greater than 12.5V
Out less than the voltage of 12V), when being 24V, 12V can be stabilized the output voltage, electric current maximum 3A's stablizes output.
12V voltage sample and control circuit: including U2 and the bleeder circuit formed by R7, R12, R10, for 12V system
Voltage is acquired, controls whether rear end DC-DC circuit exports.MC33161DR2 (U2, U3) chip is mainly used using circuit
It carries out, 2 feet of U2,3 feet are the input pins of voltage acquisition, and 5 feet, 6 feet are the output pins of collection voltages.
Sampling and control working principle:
When power supply Vin is less than 11.4V, 2 feet and 3 feet of U2 will collect a voltage less than 1.27V, by U2
Under portion's logic control, 5,6 feet of U2 will export a low level, and therefore, 3 feet according to U1 are that the output control of DC-DC makes
Energy foot, when being ground connection always, U1 does not work, and Vout is not exported.
When supply voltage Vin is in 11.5V-14.9V, 2 feet of U2 export one small 1.27V voltage, and 3 feet will collect
A voltage greater than 1.27V, according under the control of U2 internal logic, 5,6 feet of U2 will export the height electricity of 2.5V or so
It is flat, therefore 3 feet (enabled foot) of U1 will receive the high storage battery of high pressure 1.3V, control U1 is worked normally.Vout exports 12V
(when Vin > 12.5V, Vout exports 12V；It when 11.5V < Vin < 12.5V, exports and is worth between 11V~12V).
As 14.9V < Vin < 23.5V, 2 feet and 3 feet of U2 will collect a voltage greater than 1.27V, by U2
Under portion's logic control, 5,6 feet of U2 will export a low level, and therefore, 3 feet according to U1 are that the output control of DC-DC makes
Energy foot, when being grounded always, U1 does not work, and Vout is not exported.
24V voltage sample and control circuit: 24V voltage is adopted including U3 and R9, R11, R13 bleeder circuit formed
Whether collection, control rear end DC-DC circuit export.
Sampling and control working principle:
As VIN < 23.5V, 2 feet of U3 and 3 feet will collect a voltage less than 1.27V, by U3 internal logic control
Under system, 5,6 feet of U3 will export a low level, and therefore, 3 feet according to U1 are that the output of DC-DC controls enabled foot, always
When being ground connection, U1 does not work, and Vout is not exported.
As 23.5V < Vin < 42V, 2 feet of U3 export one lower than 1.27V voltage, and 3 feet will be collected greater than 1.27V
A voltage, by U3 internal logic control under, 5,6 feet of U3 will export a high level and enable foot to U1, defeated according to U1
Enabled 3 feet are controlled out and receive high level, and U1 exports 12V.
Vin > 42V is more than U1 maximum input voltage, DC-DC cisco unity malfunction.Vout is not exported.
DC-DC circuit: decompression is realized using TPS54340DDA chip, it is defeated that 2 foot input voltage vins can be realized maximum 42V
Enter, the output electric current of maximum 3.5A, 3 feet may be implemented in 8 foot sw, and EN is enabled switch, and being in level high-voltage 1.2v can be normal
It opens, DC-DC is worked normally.
4 foot RT/CLK foot control Frequency Design feet, connect a 200K Ω resistance, so that DC-DC chip operation is in fixed frequency
Rate 500kHz, 8 foot SW are DC-DC output pins, and 5 foot FB are feedback feet, adjust output voltage by the partial pressure of R1 and R5.
L1 and D1 is energy storage inductor and freewheeling diode respectively, is to provide follow current in mos pipe closure.
The circuit of composition is formed by main devices such as U1 and D1, L1, Vin also can be provided normally under 24V condition of power supply
12V output.
Such as Fig. 4: the core chips MC3316DR2 internal logic figure of sample circuit, including 12V and 24V, testing principle are phases
With.
It is shown according to sampling A/D chip work-based logic drawing: main by judging whether 2,3 foot voltages are greater than 1.27V, and its
There is the comparator of 2 2.8v and 0.6v in inside respectively, to judge the level value of 5 feet, the output of 6 feet.Control the enabled switch of DC-DC.
The vehicle power supply detection and rear dress equipment protection circuit can adapt to 12V and 24V power supply automatically, improve switching effect
Rate reduces conversion cost.
Claims (7)
1. a kind of vehicle power supply detection and rear dress equipment protection circuit, it is characterised in that: including sequentially connected carrying out surge protection electricity
Road, two parallel voltage collection circuits, output control circuit, the fixed 12V output circuit of DCDC, described two parallel voltages
Acquisition Circuit is 12V voltage collection circuit and 24V voltage collection circuit.
2. vehicle power supply detection according to claim 1 and rear dress equipment protection circuit, it is characterised in that: carrying out surge protection electricity
Road include front end self- recoverage insurance F1 and rear end TVS protection diode D2, TVS protection diode D2 it is in parallel with two capacitors
Afterwards, then with self- recoverage insurance F1 it connects.
3. vehicle power supply detection according to claim 2 and rear dress equipment protection circuit, it is characterised in that: F1 is wink thunder
K60-500,60v-5A self-recovery fuse.
4. vehicle power supply detection according to claim 1 and rear dress equipment protection circuit, it is characterised in that: voltage acquisition electricity
Road uses chip MC3316DR2.
5. vehicle power supply detection according to claim 1 and rear dress equipment protection circuit, it is characterised in that: DCDC is fixed
12V output circuit uses TPS54340DDA chip.
6. vehicle power supply detection according to claim 5 and rear dress equipment protection circuit, it is characterised in that: 4 feet of chip
RT/CLK foot control Frequency Design foot, external 200K Ω resistance, so that DC-DC chip operation is in fixed frequency 500kHz.
7. vehicle power supply detection according to claim 5 and rear dress equipment protection circuit, it is characterised in that: DCDC is fixed
The rear end of 12V output circuit is connected with inductance L1 and diode D1, respectively as energy storage inductor and freewheeling diode, manages in mos
Follow current is provided when closure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910520978.3A CN110165881A (en) | 2019-06-17 | 2019-06-17 | Vehicle power supply detection and rear dress equipment protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910520978.3A CN110165881A (en) | 2019-06-17 | 2019-06-17 | Vehicle power supply detection and rear dress equipment protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110165881A true CN110165881A (en) | 2019-08-23 |
Family
ID=67625191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910520978.3A Pending CN110165881A (en) | 2019-06-17 | 2019-06-17 | Vehicle power supply detection and rear dress equipment protection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN110165881A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687472A (en) * | 2019-11-08 | 2020-01-14 | 腾讯科技（深圳）有限公司 | Power supply monitoring device, electronic equipment, power supply monitoring method and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202340120U (en) * | 2011-12-08 | 2012-07-18 | 深圳市伊爱高新技术开发有限公司 | Automatic identification and protection circuit of vehicle power supply |
| CN203522267U (en) * | 2013-10-21 | 2014-04-02 | 常州市巨泰电子有限公司 | Vehicle charging power source having input under-voltage protection function |
| CN208423817U (en) * | 2018-01-25 | 2019-01-22 | 深圳市朗仁科技有限公司 | Voltage adaptive power circuit |
| CN210246598U (en) * | 2019-06-17 | 2020-04-03 | 北京信达众联科技有限公司 | Vehicle-mounted power supply detection and rear-mounted equipment protection circuit |
-
2019
- 2019-06-17 CN CN201910520978.3A patent/CN110165881A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202340120U (en) * | 2011-12-08 | 2012-07-18 | 深圳市伊爱高新技术开发有限公司 | Automatic identification and protection circuit of vehicle power supply |
| CN203522267U (en) * | 2013-10-21 | 2014-04-02 | 常州市巨泰电子有限公司 | Vehicle charging power source having input under-voltage protection function |
| CN208423817U (en) * | 2018-01-25 | 2019-01-22 | 深圳市朗仁科技有限公司 | Voltage adaptive power circuit |
| CN210246598U (en) * | 2019-06-17 | 2020-04-03 | 北京信达众联科技有限公司 | Vehicle-mounted power supply detection and rear-mounted equipment protection circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687472A (en) * | 2019-11-08 | 2020-01-14 | 腾讯科技（深圳）有限公司 | Power supply monitoring device, electronic equipment, power supply monitoring method and storage medium |
| CN110687472B (en) * | 2019-11-08 | 2022-03-11 | 腾讯科技（深圳）有限公司 | Power supply monitoring device, electronic equipment, power supply monitoring method and storage medium |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20220114 Address after: 300350 Haitang space-s-308-09, Zone D, Haitang Zhongchuang street, xianshuigu Town, Jinnan District, Tianjin Applicant after: Yunzhi Technology (Tianjin) Co.,Ltd. Address before: Room 402, south of the fourth floor, building 16, Zhixin village, Haidian District, Beijing 100083 Applicant before: BEIJING XINDA ZHONGLIAN TECHNOLOGY Co.,Ltd. |
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