CN201523209U - Load over-current protection circuit for automobile electrical appliance - Google Patents
Load over-current protection circuit for automobile electrical appliance Download PDFInfo
- Publication number
- CN201523209U CN201523209U CN200920180224XU CN200920180224U CN201523209U CN 201523209 U CN201523209 U CN 201523209U CN 200920180224X U CN200920180224X U CN 200920180224XU CN 200920180224 U CN200920180224 U CN 200920180224U CN 201523209 U CN201523209 U CN 201523209U
- Authority
- CN
- China
- Prior art keywords
- pin
- field effect
- resistor
- effect transistor
- field
- Prior art date
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
Disclosed is a load over-current protection circuit for an automobile electrical appliance, which comprises a field-effect tube, a microcontroller, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5, wherein the model of the field-effect tube is BTS426; the model of the microcontroller is LPC2119; a lead foot 2 of the field-effect tube is connected to an I/O pin of the microcontroller through the resistor R1; a lead foot 4 of the field-effect tube is connected to the other I/O pin of the microcontroller through the resistor R2 and also connected to a power supply VCC through the resistor R3; a lead foot 1 of the field-effect tube is connected to ground through the resistor R5; a lead foot 3 of the field-effect tube is directly connected to a +24 V power supply; a lead foot 5 of the field-effect tube is connected to load; and the lead foot 3 of the field-effect tube is connected with the lead foot 5 of the field-effect tube via the resistor R4. The load over-current protection circuit has the advantages of adopting intelligent power element with extremely small conduction resistance, having improved protection functions, omitting a relay, a fuse wire and a plurality of discrete elements and reducing the volume of a controller. Simultaneously, the load over-current protection circuit is more favorable for maintenance, and enhances system reliability.
Description
[technical field]
The utility model is about a kind of automobile protective circuit, is meant electric appliance load current foldback circuit in the automobile especially.
[background technology]
In traditional automobile is used, because to circuit higher safety performance requirement in the car, the electronic mechanical switch that has the fuse protection is widely adopted in high capacity is used always.Yet this system scheme also has certain limitation.Mechanical relay weares and teares easily when long-time running and comes in contact mistake.Simultaneously, this system schema does not possess pulse-width modulation (PWM) function yet, and requires extra diagnosis and protection device.In case the generation fault just needs to change fuse, and the temperature characterisitic of fuse to the requirement of load often than distribution height.At low temperature with in the short time, the powerful electric current that instantaneous short-circuit produced still has very big harm to system.Therefore, no matter be based on cost, still technical consideration, traditional relay and fuse scheme are not best choice.
To sum up, existing car electrics adopt relay to add fuse and control, and reliability is low, the failure rate height, and the wire structures complexity of whole system, cost increases, and also causes serious electromagnetic interference.
[utility model content]
Technical problem to be solved in the utility model is to provide a kind of have perfect defencive function, cost is low and reliability is high car electrics load current foldback circuit.
The utility model solves the problems of the technologies described above by the following technical programs: a kind of car electrics load current foldback circuit, comprise field effect transistor, microcontroller, resistance R 1, R2, R3, R4, R5, wherein field effect transistor IC1 model is BTS426, microcontroller IC2 model is LPC2119, and the pin 2 of field effect transistor is connected to one of them I/O pin of microcontroller by resistance R 1; The pin 4 of field effect transistor is connected to another I/O pin of microcontroller by resistance R 2, and the pin 4 of field effect transistor is connected to power supply VCC by resistance R 3; The pin 1 of field effect transistor is by resistance R 5 ground connection; The pin 3 of field effect transistor directly connects+the 24V power supply; The pin 5 of field effect transistor connects load, is connected resistance R 4 between the pin 3 of field effect transistor and the pin 5.
The advantage of the utility model car electrics load current foldback circuit is: adopted the very little smart power device of conducting resistance; (overvoltage protection, overcurrent protection, overload protection, short-circuit protection, excess temperature turn-off, open circuit detects to have perfect defencive function; power supply reverse connecting protection etc.); save relay, fuse and some discrete components, reduced the volume of controller.Simultaneously, also can utilize the automatic diagnosis of the diagnostic function realization fault of smart power device, can know that not only fault has appearred in which device, and can know that what reason has caused such mistake, help maintenance more, in time notify the car owner by single-chip microcomputer with fault message, be convenient to the car owner and in time find and handle, greatly strengthened traveling security.In addition, compare with the discrete component that uses relay and fuse, system has reduced power consumption, has strengthened the reliability of system.
[description of drawings]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the schematic diagram of the utility model car electrics load current foldback circuit.
[embodiment]
See also shown in Figure 1ly, the utility model car electrics load current foldback circuit comprises field effect transistor IC1, microcontroller (MCU) IC2, resistance R 1, R2, R3, R4, R5.
Wherein field effect transistor IC1 model is BTS426, and microcontroller IC2 model is LPC2119.The pin 2 (IN) of field effect transistor IC1 is the input control pin of field effect transistor IC1, is connected to one of them I/O pin of microcontroller IC2 by resistance R 1; The pin 4 (ST) of field effect transistor IC1 is the state feedback pin of field effect transistor IC1, be connected to another I/O pin of microcontroller IC2 by resistance R 2, and the pin 4 of field effect transistor IC1 is connected to power supply VCC by resistance R 3; The pin 1 of field effect transistor IC1 is a grounding pin, by resistance R 5 ground connection; The pin 3 of field effect transistor IC1 is a power pins, directly connects+the 24V power supply; The pin 5 of field effect transistor IC1 is output pin (OUT), connects load, is connected resistance R 4 between the pin 3 of field effect transistor IC1 and the pin 5 of field effect transistor IC1.
Wherein microcontroller IC2 is used for controlling and detecting; field effect transistor IC1 is used for driving load as smart power device, and resistance R 1, R2, R5 are current-limiting resistance, the port of protection microcontroller IC2; resistance R 3 is a pull-up resistor, and R resistance 4 detects pull-up resistor for open circuit.
When the pin 2 of field effect pipe IC1 was input as high level, pin 5 outputs of field effect transistor IC1 were opened.When the pin 2 of field effect pipe IC1 was input as low level, pin 5 outputs of field effect transistor IC1 were closed.
The pin 4 indication load conditions of field effect transistor IC1, specific as follows:
1, load is just often:
When the pin 2 of field effect pipe IC1 was input as low level, pin 5 outputs of field effect transistor IC1 were turn-offed, and pin 4 level of field effect transistor IC1 are high level.
When the pin 2 of field effect pipe IC1 was input as high level, pin 5 outputs of field effect transistor IC1 were opened, and pin 4 level of field effect transistor IC1 are low level.
Shown in following table one.
Table one
| Incoming level (IN) | State level (ST) | Output level (OUT) |
| H | H | H |
| L | H | L |
2, during load open circuit
When the pin 2 of field effect pipe IC1 was input as low level, pin 5 outputs of field effect transistor IC1 were turn-offed, and pin 4 level of field effect transistor IC1 are low level.
When the pin 2 of field effect pipe IC1 was input as high level, pin 5 outputs of field effect transistor IC1 were opened, and pin 4 level of field effect transistor IC1 are low level.
Shown in following table two.
Table two
| Incoming level (IN) | State level (ST) | Output level (OUT) |
| H | L | L |
| L | L | L |
3, when load short circuits or overcurrent
When the pin 2 of field effect pipe IC1 was input as low level, pin 5 outputs of field effect transistor IC1 were turn-offed, and pin 4 level of field effect transistor IC1 are high level.
When the pin 2 of field effect pipe IC1 was input as high level, pin 5 outputs of field effect transistor IC1 were opened, and pin 4 level of field effect transistor IC1 are low level.
Shown in following table three.
Table three
| Incoming level (IN) | State level (ST) | Output level (OUT) |
| H | L | L |
| L | H | L |
Other comprise, cell voltage too high (＞34V) or cross when low (＜5v) time, field effect transistor IC1 automatically shuts down output, the protection load appliance.
Claims (1)
1. car electrics load current foldback circuit, it is characterized in that: comprise field effect transistor, microcontroller, resistance R 1, R2, R3, R4, R5, wherein the field effect transistor model is BTS426, the microcontroller model is LPC2119, and the pin 2 of field effect transistor is connected to one of them I/O pin of microcontroller by resistance R 1; The pin 4 of field effect transistor is connected to another I/O pin of microcontroller by resistance R 2, and the pin 4 of field effect transistor is connected to power supply VCC by resistance R 3; The pin 1 of field effect transistor is by resistance R 5 ground connection; The pin 3 of field effect transistor directly connects+the 24V power supply; The pin 5 of field effect transistor connects load, is connected resistance R 4 between the pin 3 of field effect transistor and the pin 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920180224XU CN201523209U (en) | 2009-10-30 | 2009-10-30 | Load over-current protection circuit for automobile electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920180224XU CN201523209U (en) | 2009-10-30 | 2009-10-30 | Load over-current protection circuit for automobile electrical appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201523209U true CN201523209U (en) | 2010-07-07 |
Family
ID=42509385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920180224XU Expired - Fee Related CN201523209U (en) | 2009-10-30 | 2009-10-30 | Load over-current protection circuit for automobile electrical appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201523209U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320247A (en) * | 2011-07-07 | 2012-01-18 | 丽水职业技术学院 | Automobile short-circuit protection, indication and alarm device |
| CN107993891A (en) * | 2017-12-31 | 2018-05-04 | 昌辉汽车电气***（安徽）有限公司 | The protection circuit and method of a kind of relay contact in electric machine control system |
| CN109067305A (en) * | 2018-08-15 | 2018-12-21 | 石阡县龙塘镇大山村鑫源茶叶专业合作社 | A kind of tea stir-frying machine motor-drive circuit |
-
2009
- 2009-10-30 CN CN200920180224XU patent/CN201523209U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320247A (en) * | 2011-07-07 | 2012-01-18 | 丽水职业技术学院 | Automobile short-circuit protection, indication and alarm device |
| CN107993891A (en) * | 2017-12-31 | 2018-05-04 | 昌辉汽车电气***（安徽）有限公司 | The protection circuit and method of a kind of relay contact in electric machine control system |
| CN107993891B (en) * | 2017-12-31 | 2024-01-16 | 昌辉汽车电气***（安徽）有限公司 | Protection circuit and method for relay contact in motor control system |
| CN109067305A (en) * | 2018-08-15 | 2018-12-21 | 石阡县龙塘镇大山村鑫源茶叶专业合作社 | A kind of tea stir-frying machine motor-drive circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203056953U (en) | Driver and bus capacitor discharge circuit thereof | |
| CN201523211U (en) | Power circuit of finished electric automobile controller | |
| CN101335493B (en) | H bridge driving device of automobile electric boosting steering motor | |
| CN203674082U (en) | Relay control circuit | |
| CN202975135U (en) | Zero-cross detection circuit with low standby power consumption | |
| CN201523209U (en) | Load over-current protection circuit for automobile electrical appliance | |
| CN201726176U (en) | Charge control circuit with bidirectional reverse connection protection for storage batteries | |
| CN203368316U (en) | PWM dead-time protective circuit and air conditioner | |
| CN205540038U (en) | General type automobile body control module based on CAN bus | |
| CN100585658C (en) | CAN bus data collector | |
| CN204316082U (en) | A kind of overvoltage surge suppresses circuit | |
| CN205231727U (en) | Switching power supply output connects battery to join conversely protection automatic control circuit | |
| CN203709802U (en) | Load drive protection circuit of electric pressure cooker | |
| CN203027136U (en) | Direct current socket | |
| CN103956946B (en) | A kind of low-pressure high-power DC motor control circuit of band overcurrent protection | |
| CN203326565U (en) | Direct current motor control circuit with heat protection function | |
| CN202231609U (en) | Current-limiting device and electric system | |
| CN203086399U (en) | Direct-current motor controller of electric fork truck lifting hydraulic pump | |
| CN203617889U (en) | Silicon controlled rectifier drive circuit and electric heating equipment | |
| CN107086540A (en) | Electromagnetic oven with hardware protection function | |
| CN202818267U (en) | PTC heater driving module for air conditioner of electric automobile | |
| CN208896885U (en) | Power battery enhancing continues a journey and prolongs insurance system | |
| CN209787147U (en) | direct current intelligent solid-state relay | |
| CN205210621U (en) | Control system with total line type intelligence switch | |
| CN208675582U (en) | A kind of Novel blood pressure-reducing type LED power circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100707 Termination date: 20121030 |