CN110474298B - Simple vehicle-mounted storage battery detection and protection circuit - Google Patents
Simple vehicle-mounted storage battery detection and protection circuit Download PDFInfo
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- CN110474298B CN110474298B CN201910637133.2A CN201910637133A CN110474298B CN 110474298 B CN110474298 B CN 110474298B CN 201910637133 A CN201910637133 A CN 201910637133A CN 110474298 B CN110474298 B CN 110474298B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/006—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too high or too low voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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- Protection Of Static Devices (AREA)
Abstract
The invention discloses a simple vehicle-mounted battery detection and protection circuit, which comprises a battery input end, a protection circuit, a high-voltage low dropout regulator (LDO) circuit, a first comparator, a second comparator and a switch circuit, wherein the battery input end is connected with the anode of a vehicle-mounted battery, the output end is connected with the input end of the high-voltage LDO circuit through the protection circuit, and the high-voltage LDO circuit outputs 5V voltage to the first comparator and the second comparator; the first comparator sets a threshold voltage, identifies the voltage of the vehicle-mounted storage battery and outputs a corresponding high/low level to the negative electrode input end of the second comparator, and the output end of the second comparator is connected with the switch circuit; if the voltage value of the vehicle-mounted storage battery is lower than the preset voltage value, the second comparator outputs a high level, the enabling end of the switching circuit is pulled down by the triode, and the power supply is turned off. The invention realizes the monitoring and protection of the vehicle-mounted storage battery through hardware on the basis of not increasing a single chip microcomputer chip, can realize the effective protection of the vehicle-mounted storage batteries with different voltages, has low power consumption and effectively prevents the problem of storage battery feed.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a simple vehicle-mounted storage battery detection and protection circuit.
Background
Along with the release of the repurchase and purchase-increasing demand and the improvement of the residential consumption capacity caused by the rapid increase of the annual output and sales volume and the holdup volume of domestic automobiles, the trend of upgrading automobile consumption is expected to be continuous in the future, and consumers further expand the requirements of vehicle safety control and interactive experience. It is expected that the cost of the electronics on the automobile will account for more than 30% of the total automobile cost in the next 10 years. The vehicle-mounted equipment is more and more in type, vehicle event data recorder, GPS navigation, vehicle radar, WIFI, bluetooth, 4G and so on, and vehicle-mounted electronic equipment generally can not have independent battery power supply, but directly uses the car storage battery as power supply.
When the automobile engine is started, the storage battery is charged, and when the engine is stopped, the storage battery is not charged and the power supply to the vehicle-mounted electronic equipment is kept. At this time, if the supply current of the vehicle-mounted equipment is still large or the stop time of the engine is long, the automobile battery is continuously discharged, the discharge is not cut off, the power feed is caused, and the ACC ignition failure is caused.
At present, common intelligent vehicle-mounted electronic equipment only adopts ACC OFF dormancy low-power-consumption design aiming at a vehicle battery, does not carry out low-voltage protection or prevent staying, and prevents battery feeding caused by abnormal dormancy of the vehicle-mounted electronic equipment. The equipment for low-voltage protection is expensive or cannot be compatible with different battery voltage (12V &24V) vehicles.
In the prior art, an additional singlechip is required to be added for control, so that the use space and hardware cost of a product PCB are increased, and the workload of burning software is increased; moreover, for different vehicle types, the low-voltage protection requirements of different customers are different, and different burning programs need to be additionally added to the single chip microcomputer; and the current consumption of the single chip microcomputer is higher, and the risk of consuming the electric quantity of the storage battery exists. In addition, most of the existing designs only can be carried by vehicles with one voltage, and the vehicles of 12V and 24V cannot be compatible at the same time.
Disclosure of Invention
The invention provides a simple vehicle-mounted storage battery detection and protection circuit which can monitor the voltage of a vehicle storage battery in real time and completely cut off an input power supply of equipment at a preset low voltage, thereby preventing the storage battery from feeding and starting a protection function.
The technical scheme of the invention is realized as follows:
a simple vehicle-mounted storage battery detection and protection circuit comprises a storage battery input end, a protection circuit, a high-voltage low dropout regulator (LDO) circuit, a first comparator, a second comparator and a switch circuit, wherein the storage battery input end is connected with the anode of a vehicle-mounted storage battery, the output end of the storage battery is connected with the input end of the high-voltage LDO circuit through the protection circuit, and the high-voltage LDO circuit outputs 5V voltage to the first comparator and the second comparator; the first comparator sets threshold voltage, the output end of the first comparator is connected with a 12V path and a 24V path, the 12V path and the 24V path respectively comprise a switch tube and a ground resistance connected with the switch tube, and the resistance value of the ground resistance of the 12V path is higher than that of the ground resistance of the 24V path; the output ends of the 12V path and the 24V path are connected with the negative electrode input end of the second comparator, and the output end of the second comparator is connected with the switch circuit; if the voltage of the positive electrode of the vehicle-mounted storage battery is lower than the threshold voltage, the first comparator outputs a high level, the 12V channel is switched on, and the 24V channel is switched off, and if the voltage of the positive electrode of the vehicle-mounted storage battery is higher than the threshold voltage, the first comparator outputs a low level, the 12V channel is switched off, and the 24V channel is switched on; if the voltage value of the vehicle-mounted storage battery is lower than the preset voltage value, the second comparator outputs a high level, the enabling end of the switching circuit is pulled down by the triode, and the power supply is turned off.
In a preferred embodiment of the present invention, the second comparator is added with a hysteresis circuit, the hysteresis circuit includes resistors R14, R15, and R16, one end of the resistor R14 is connected to the output terminal of the second comparator, the other end of the resistor R14 is connected to the resistor R15, the other end of the resistor R15 is connected to the positive input terminal of the second comparator, and the resistor R16 is connected to the positive input terminal of the second comparator and the reference pin.
As a preferred embodiment of the present invention, the output terminal of the second comparator is provided with an RC delay circuit, the RC delay circuit includes a resistor R13, a capacitor C11 and a capacitor C12, the resistor R13 is connected to the output terminal of the second comparator, the other terminal is connected to the capacitors C11 and C12 which are connected in parallel, and the other terminals of the capacitors C11 and C12 are grounded.
As a preferred embodiment of the present invention, the voltage at the negative input terminal of the first comparator is obtained by dividing the vehicle battery voltage through resistors, and includes resistors R2, R3, and R4 connected in sequence, the input terminal of the resistor R2 is the vehicle battery voltage, the resistor R4 is grounded, and the common terminal of the resistors R2 and R3 is connected to the negative input terminal of the first comparator.
As a preferred embodiment of the present invention, the 12V path includes a MOS transistor Q1, a gate of the MOS transistor Q1 is connected to the output terminal of the first comparator through a resistor R23, and a drain is connected to a ground resistor R25; the 24V path comprises a MOS transistor Q2, the grid of the MOS transistor Q2 is connected with the output end resistor R23 of the first comparator through an amplifying transistor and a voltage division circuit, and the drain is connected with a ground resistor R26.
The invention further comprises a BUCK circuit, wherein the BUCK circuit is connected with the output end of the protection circuit, and the output end of the protection circuit is connected with the negative electrode input end of the second comparator through a resistor R1.
In a preferred embodiment of the present invention, the switching circuit includes a transistor Q4, a base set of the transistor Q4 is connected to the output terminal of the second comparator, an emitter is grounded, a collector is connected to the enable terminal of the BUCK circuit, and the output terminal of the high-voltage LDO circuit is connected via a resistor R10.
As a preferred embodiment of the present invention, the preset voltage value is set by resistors R1 and R25, the voltage at the negative input terminal of the second comparator is obtained by dividing the voltage by the vehicle battery resistor, and the preset low voltage protection threshold is reached by modifying the values of R1, R25 and R26.
The invention has the beneficial effects that: on the basis of not increasing a single chip microcomputer chip, monitoring and protection of the vehicle-mounted storage battery are realized through hardware, and the voltages of the storage batteries of different vehicle types are compatible without burning different software; effective protection of different-voltage vehicle-mounted storage batteries can be realized only by changing the resistance, the current consumption of the scheme is much lower than that of a single chip microcomputer scheme, and the problem of battery feed caused by current consumption of the height of the circuit can be effectively prevented when the storage battery is low in electric quantity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an embodiment of a simple on-board battery detection and protection circuit according to the present invention.
In the figure, 1-the input end of the battery jar; 2-a protection circuit; 3-a high voltage LDO circuit; 4-a first comparator; 5-a second comparator; 6-a switching circuit; 7-BUCK circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the invention provides a simple vehicle-mounted battery detection and protection circuit 2, which comprises a battery input end 1, a protection circuit 2, a high-voltage LDO circuit 3, a first comparator 4, a second comparator 5 and a switch circuit 6, wherein the battery input end 1 is connected with the anode of a vehicle-mounted battery, the output end is connected with the input end of the high-voltage LDO circuit 3 through the protection circuit 2, and the high-voltage LDO circuit 3 outputs 5V voltage to the first comparator 4 and the second comparator 5; the first comparator 4 sets a threshold voltage, the output end of the first comparator is connected with a 12V path and a 24V path, the 12V path and the 24V path respectively comprise a switch tube and a ground resistance connected with the switch tube, and the resistance value of the ground resistance of the 12V path is higher than that of the ground resistance of the 24V path; the output ends of the 12V path and the 24V path are connected with the negative input end of the second comparator 5, and the output end of the second comparator 5 is connected with the switch circuit 6; if the voltage of the positive electrode of the vehicle-mounted storage battery is lower than the threshold voltage (18V), the voltage of the negative end of the first comparator 4 is lower than the voltage of the positive end, the first comparator 4 outputs high level, the 12V channel is connected, the 24V channel is disconnected, if the voltage of the negative end of the first comparator 4 is higher than the threshold voltage, the voltage of the negative end of the first comparator 4 is greater than the voltage of the positive end, the first comparator 4 outputs low level, the 12V channel is disconnected, and the 24V channel is connected; if the voltage value of the vehicle-mounted storage battery is lower than the preset voltage value, the second comparator 5 outputs high level, the enabling end of the switch circuit 6 is pulled down by the triode, and the power supply is turned off.
The protection circuit 2 includes a surge protection and reverse connection prevention circuit, and is mainly used for protecting the circuit.
The second comparator 5 is additionally provided with a hysteresis circuit, the hysteresis circuit comprises resistors R14, R15 and R16, one end of the resistor R14 is connected with the output end of the second comparator 5, the other end of the resistor R14 is connected with the resistor R15, the other end of the resistor R15 is connected with the positive input end of the second comparator 5, and the resistor R16 is connected with the positive input end of the second comparator 5 and a reference pin. The problem that the output of the comparator is unstable (the problem of back-and-forth switching) when the voltage of the storage battery is at a low-voltage protection critical point is effectively solved, and the circuit immunity is increased, so that a power supply path is effectively protected from being damaged.
The output end of the second comparator 5 is provided with an RC delay circuit, the RC delay circuit comprises a resistor R13, a capacitor C11 and a capacitor C12, the resistor R13 is connected with the output end of the second comparator 5, the other end of the resistor R13 is connected with the capacitors C11 and C12 which are connected in parallel, and the other ends of the capacitors C11 and C12 are grounded. The RC delay circuit is added at the output end of the second comparator 5, when the operation such as automobile ignition or brake starting possibly causes the instantaneous large jitter of the automobile storage battery, the RC delay circuit filters the abnormity such as unstable comparator output level caused by the voltage jitter of the storage battery, and therefore the stable work of the rear-end power module is achieved.
The voltage of the negative input end of the first comparator 4 is obtained by vehicle-mounted storage battery voltage through resistance voltage division, and comprises resistors R2, R3 and R4 which are connected in sequence, the input end of the resistor R2 is the vehicle-mounted storage battery voltage, the resistor R4 is grounded, and the public end of the resistors R2 and R3 is connected with the negative input end of the first comparator 4.
The 12V path comprises a MOS transistor Q1, the grid electrode of the MOS transistor Q1 is connected with the output end of the first comparator 4 through a resistor R23, and the drain electrode is connected with a ground resistor R25; the 24V path comprises a MOS transistor Q2, the grid of the MOS transistor Q2 is connected with the output end resistor R23 of the first comparator 4 through an amplifying transistor and a voltage division circuit, and the drain is connected with a ground resistor R26.
The invention also comprises a BUCK circuit 7, wherein the BUCK circuit 7 is connected with the output end of the protection circuit 2, and the output end of the protection circuit 2 is connected with the negative electrode input end of the second comparator 5 through a resistor R1.
The switch circuit 6 comprises a triode Q4, the base set of the triode Q4 is connected with the output end of the second comparator 5, the emitting electrode is grounded, the collecting electrode is connected with the enable end of the BUCK circuit 7, and the collector is also connected with the output end of the high-voltage LDO circuit 3 through a resistor R10.
The voltage preset value is set by resistors R1 and R25, the voltage of the negative electrode input end of the second comparator 5 is obtained after voltage division by a vehicle-mounted storage battery resistor, and the preset low-voltage protection threshold value is reached by modifying the values of R1, R25 and R26.
For a 12V system, if an automobile storage battery falls to a threshold value of 10.5V (which can be set by resistors R1 and R25), the output of U2 is high level, C11 and C12 are charged by R13, when the base level of a triode Q4 reaches above 0.6V after 3S, Q4 is saturated, a DC/DC enable pin is pulled down, the output of a switch circuit 6 is turned off, and therefore the effect of protecting the automobile storage battery is achieved.
For a 24V system, if an automobile storage battery falls to a threshold value of 22V (the storage battery can be set through resistors R1 and R25), the output of U2 is high level, C11 and C12 are charged through R13, when the base level of a triode Q4 reaches above 0.6V after 3S, Q4 is saturated, a DC/DC enable pin is pulled down, the output of a switch circuit 6 is turned off, and therefore the automobile storage battery is protected.
When the automobile battery is below the low-voltage protection threshold, the normal U2 output is high and RC (R13C 11)
C12) After charging for 3S, the triode Q4 is saturated, and the output of the switch circuit 6 is turned off. If before the saturation of Q4,
the voltage returns to the value above the threshold value, the output of the U2 is instantly changed to be low, the Q4 cannot be saturated, the normal working output of the switch circuit 6 is not turned off, and a good anti-shaking effect can be achieved.
And (3) BUCK chip: MPS9457, the main effect is for turning into stable 5V with storage battery voltage, for external equipment power supply.
High-voltage LDO chip: WL2851E50-5/TR, which is mainly used for converting the voltage of the battery into stable 5V to supply power to the comparator.
First/second comparator: SGM8706YN6G/TR, main function 1. select on-resistance. The low-voltage protection function of the 12&24V storage battery system is realized by detecting whether the input voltage judging circuit works in the 12V storage battery system or the 24V system and selecting the corresponding on-resistance. 2. And low-voltage detection, wherein when the input voltage is detected to be lower than a preset threshold value, a high level is output to drive the triode, so that the DC/DC enabling pin is pulled down, and the low-voltage protection function is realized.
MOSFET (N-channel): the corresponding resistor is turned on.
Triode (NPN): the DC/DC enable pin is turned on or off.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a simple and easy on-vehicle storage battery detects and protection circuit which characterized in that: the high-voltage low-dropout regulator comprises a storage battery input end, a protection circuit, a high-voltage low-dropout regulator (LDO) circuit, a first comparator, a second comparator and a switch circuit, wherein the storage battery input end is connected with the anode of a vehicle-mounted storage battery, the output end is connected with the input end of the high-voltage LDO circuit through the protection circuit, and the high-voltage LDO circuit outputs 5V voltage to the first comparator and the second comparator; the first comparator sets threshold voltage, the output end of the first comparator is connected with a 12V path and a 24V path, the 12V path and the 24V path respectively comprise a switch tube and a ground resistance connected with the switch tube, and the resistance value of the ground resistance of the 12V path is higher than that of the ground resistance of the 24V path; the output ends of the 12V path and the 24V path are connected with the negative electrode input end of the second comparator, and the output end of the second comparator is connected with the switch circuit; if the voltage of the positive electrode of the vehicle-mounted storage battery is lower than the threshold voltage, the first comparator outputs a high level, the 12V channel is switched on, and the 24V channel is switched off, and if the voltage of the positive electrode of the vehicle-mounted storage battery is higher than the threshold voltage, the first comparator outputs a low level, the 12V channel is switched off, and the 24V channel is switched on; if the voltage value of the vehicle-mounted storage battery is lower than the preset voltage value, the second comparator outputs a high level, the enabling end of the switching circuit is pulled down by the triode, and the power supply is turned off.
2. The simple vehicle-mounted battery detection and protection circuit according to claim 1, characterized in that: the second comparator is added with a hysteresis circuit, the hysteresis circuit comprises resistors R14, R15 and R16, one end of the resistor R14 is connected with the output end of the second comparator, the other end of the resistor R14 is connected with the resistor R15, the other end of the resistor R15 is connected with the positive input end of the second comparator, and the resistor R16 is connected with the positive input end of the second comparator and a reference pin.
3. The simple vehicle-mounted battery detection and protection circuit according to claim 1, characterized in that: the output end of the second comparator is provided with an RC delay circuit, the RC delay circuit comprises a resistor R13, a capacitor C11 and a capacitor C12, the resistor R13 is connected with the output end of the second comparator, the other end of the resistor R13 is connected with the capacitors C11 and C12 which are connected in parallel, and the other ends of the capacitors C11 and C12 are grounded.
4. The simple vehicle-mounted battery detection and protection circuit according to claim 1, characterized in that: the voltage of the negative input end of the first comparator is obtained by vehicle-mounted battery voltage through resistance voltage division, and comprises resistors R2, R3 and R4 which are connected in sequence, the input end of the resistor R2 is the vehicle-mounted battery voltage, the resistor R4 is grounded, and the common end of the resistors R2 and R3 is connected with the negative input end of the first comparator.
5. The simple vehicle-mounted battery detection and protection circuit as claimed in claim 1 or 4, wherein: the 12V path comprises an MOS transistor Q1, the grid electrode of the MOS transistor Q1 is connected with the output end of the first comparator through a resistor R23, and the drain electrode is connected with a ground resistor R25; the 24V path comprises a MOS transistor Q2, the grid of the MOS transistor Q2 is connected with the output end resistor R23 of the first comparator through an amplifying transistor and a voltage division circuit, and the drain is connected with a ground resistor R26.
6. The simple vehicle-mounted battery detection and protection circuit according to claim 5, characterized in that: the BUCK circuit is connected with the output end of the protection circuit, and the output end of the protection circuit is connected with the negative electrode input end of the second comparator through a resistor R1.
7. The simple vehicle-mounted battery detection and protection circuit according to claim 6, characterized in that: the switch circuit comprises a triode Q4, the base electrode of the triode Q4 is connected with the output end of the second comparator, the emitting electrode is grounded, the collecting electrode is connected with the enable end of the BUCK circuit, and the collector electrode is also connected with the output end of the high-voltage LDO circuit through a resistor R10.
8. The simple vehicle-mounted battery detection and protection circuit according to claim 7, characterized in that: the preset voltage value is set by resistors R1 and R25, the voltage of the negative electrode input end of the second comparator is obtained after voltage division by a vehicle-mounted battery resistor, and the preset voltage value is achieved by modifying the values of R1, R25 and R26.
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| CN201910637133.2A CN110474298B (en) | 2019-07-15 | 2019-07-15 | Simple vehicle-mounted storage battery detection and protection circuit |
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| CN201910637133.2A CN110474298B (en) | 2019-07-15 | 2019-07-15 | Simple vehicle-mounted storage battery detection and protection circuit |
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| CN110474298B true CN110474298B (en) | 2021-09-28 |
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| CN112688276A (en) * | 2020-12-28 | 2021-04-20 | 深圳市安帕尔科技有限公司 | Air station alarm host circuit and air station equipment |
| CN114362096B (en) * | 2021-11-30 | 2023-10-17 | 江铃汽车股份有限公司 | Power management circuit of vehicle-mounted entertainment system |
| CN114094809A (en) * | 2022-01-18 | 2022-02-25 | 深圳佑驾创新科技有限公司 | On-vehicle 12V 24V input low-voltage threshold switching circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437554A (en) * | 2011-12-29 | 2012-05-02 | 厦门雅迅网络股份有限公司 | Battery protection method and circuit of vehicle-mounted equipment |
| 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 |
| JP2015136200A (en) * | 2014-01-16 | 2015-07-27 | 矢崎総業株式会社 | Power supply shut-off device |
| CN204578058U (en) * | 2015-03-23 | 2015-08-19 | 石家庄开发区天远科技有限公司 | A kind of vehicle-mounted high-voltage turn-off circuit |
| CN107776515A (en) * | 2016-08-26 | 2018-03-09 | 厦门雅迅网络股份有限公司 | A kind of the storage battery protection circuit and method of adaptive car-mounted terminal |
-
2019
- 2019-07-15 CN CN201910637133.2A patent/CN110474298B/en active Active
Patent Citations (5)
| 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 |
| CN102437554A (en) * | 2011-12-29 | 2012-05-02 | 厦门雅迅网络股份有限公司 | Battery protection method and circuit of vehicle-mounted equipment |
| JP2015136200A (en) * | 2014-01-16 | 2015-07-27 | 矢崎総業株式会社 | Power supply shut-off device |
| CN204578058U (en) * | 2015-03-23 | 2015-08-19 | 石家庄开发区天远科技有限公司 | A kind of vehicle-mounted high-voltage turn-off circuit |
| CN107776515A (en) * | 2016-08-26 | 2018-03-09 | 厦门雅迅网络股份有限公司 | A kind of the storage battery protection circuit and method of adaptive car-mounted terminal |
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