CN204068688U - A kind of power supply automatic shutdown circuitry of commercial vehicle instrument - Google Patents
A kind of power supply automatic shutdown circuitry of commercial vehicle instrument Download PDFInfo
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- CN204068688U CN204068688U CN201420227505.7U CN201420227505U CN204068688U CN 204068688 U CN204068688 U CN 204068688U CN 201420227505 U CN201420227505 U CN 201420227505U CN 204068688 U CN204068688 U CN 204068688U
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- electric current
- current output
- switching mode
- voltage circuit
- stable voltage
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Abstract
The utility model relates to a kind of power supply automatic shutdown circuitry of commercial vehicle instrument, comprise electric current output buck switching mode integrated stable voltage circuit, 1 pin access point ignition source and anode of electric current output buck switching mode integrated stable voltage circuit, 3 pin ground connection of electric current output buck switching mode integrated stable voltage circuit, the first polarity free capacitor and the first polar capacitor is connected with successively between 1 pin of electric current output buck switching mode integrated stable voltage circuit and the lead-in wire of 3 pins, after adopting above technical scheme: the utility model proposes a kind of commercial vehicle instrument power automatic shutdown circuitry, its turn-off function is on the basis of the internal electric source conversion chip LM2576 of existing instrument, a small amount of control element is adopted to realize, which overcome the cost increase problem adopting power source special managing chip to bring in existing commercial vehicle instrument, reduce the product cost realizing power supply automatic cut-off function, improve the price competitiveness of the type commercial vehicle instrument.
Description
Technical field
The utility model belongs to automobile instrument, is specifically related to a kind of power supply automatic shutdown circuitry of commercial vehicle instrument.
Background technology
Automobile instrument carry power supply often use igniting after priming supply, and battery feed is used when not lighting a fire, when closing for avoiding priming supply, automobile instrument is to the lasting consumption of battery feed, generally should arrange automobile instrument power source automatic shutdown circuit in automobile instrument.In existing commercial vehicle instrument, this power cutting circuit often adopts additional power management chip, and this type of chip price general charged is higher, causes automobile instrument cost increase.
Summary of the invention
The object of the utility model is the power supply automatic shutdown circuitry providing a kind of commercial vehicle instrument.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of power supply automatic shutdown circuitry of commercial vehicle instrument, comprise electric current output buck switching mode integrated stable voltage circuit, 1 pin access point ignition source and anode of electric current output buck switching mode integrated stable voltage circuit, 3 pin ground connection of electric current output buck switching mode integrated stable voltage circuit, the first polarity free capacitor and the first polar capacitor is connected with successively between 1 pin of electric current output buck switching mode integrated stable voltage circuit and the lead-in wire of 3 pins, 2 pins of electric current output buck switching mode integrated stable voltage circuit export and connect to a parallel branch, parallel branch is voltage stabilizing didoe, second polar capacitor and the second polarity free capacitor, 5 pins of electric current output buck switching mode integrated stable voltage circuit connect to control circuit.
Control circuit comprises the triode of input, the collector electrode of triode is connected with 5 pins of electric current output buck switching mode integrated stable voltage circuit, the base stage of triode is connected with power supply output control terminal by the first resistance, the grounded emitter of triode, base stage second resistance in parallel with between emitter of triode, the collector electrode of triode is also connected to anode by the 3rd resistance.
Connected by inductance between voltage stabilizing didoe, the second polar capacitor.
4 pins of electric current output buck switching mode integrated stable voltage circuit connect between voltage stabilizing didoe, the second polar capacitor.
The resistance of the first resistance is 10K Ω, and the resistance of the second resistance is 10K Ω, and the resistance of the 3rd resistance is 100K Ω.
The model of electric current output buck switching mode integrated stable voltage circuit is LM2576.
After adopting above technical scheme: the utility model proposes a kind of commercial vehicle instrument power automatic shutdown circuitry, its turn-off function, on the basis of the internal electric source conversion chip LM2576 of existing instrument, adopts a small amount of control element to realize.Which overcome the cost increase problem adopting power source special managing chip to bring in existing commercial vehicle instrument, reduce the product cost realizing power supply automatic cut-off function, improve the price competitiveness of the type commercial vehicle instrument.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
See Fig. 1, a kind of power supply automatic shutdown circuitry of commercial vehicle instrument, comprise electric current output buck switching mode integrated stable voltage circuit 1, 1 pin two access point ignition source 3 and anode 4 of electric current output buck switching mode integrated stable voltage circuit 1, 3 pin 5 ground connection of electric current output buck switching mode integrated stable voltage circuit 1, the first polarity free capacitor 6 and the first polar capacitor 7 is connected with successively between 1 pin two of electric current output buck switching mode integrated stable voltage circuit 1 and the lead-in wire of 3 pins 5, 2 pins 8 of electric current output buck switching mode integrated stable voltage circuit 1 export and connect to a parallel branch, parallel branch is voltage stabilizing didoe 9, second polar capacitor 10 and the second polarity free capacitor 11, 5 pin ones 2 of electric current output buck switching mode integrated stable voltage circuit 1 connect to control circuit.
All parts of the present utility model is explained:
1) control circuit comprises the triode 13 of input, the collector electrode 14 of triode 13 is connected with 5 pin ones 2 of electric current output buck switching mode integrated stable voltage circuit 1, the base stage 15 of triode 13 is connected with power supply output control terminal 17 by the first resistance 16, emitter 18 ground connection of triode 13, base stage 15 second resistance 19 in parallel with between emitter 18 of triode 13, the collector electrode 14 of triode 13 is also connected to anode 4 by the 3rd resistance 20.
2) connected by inductance 21 between voltage stabilizing didoe 9, second polar capacitor 10.
3) 4 pin twos 2 of electric current output buck switching mode integrated stable voltage circuit 1 connect between voltage stabilizing didoe 9, second polar capacitor 10.
4) resistance of the first resistance 16 is 10K Ω, and the resistance of the second resistance 19 is 10K Ω, and the resistance of the 3rd resistance 20 is 100K Ω.
5) model of electric current output buck switching mode integrated stable voltage circuit 1 is LM2576.
Operation principle of the present utility model:
1) when automobile starting, the power supply input of whole system can be provided by priming supply, be generally+24V voltage, input via 1 pin adopting fixed value+5V to export from LM2576 after C9 and C11 power filter, and the 2 pin output fixed values at LM2576 after C12 and C13 filtering are+5V voltage, can be system power supply.PWM_CTL is connected on internal controller pin, when PWM_CTL is high level, and triode T4 saturation conduction, then its current collection very low level, thus 5 pin keeping LM2576 are low level, make LM2576 be in normal operating conditions.
2) when automotive ignition power-off, priming supply disappears, and now system is powered by internal battery (BATT+), and internal control can be made to carry out the work such as the preservation of data.After waiting task terminates, internal controller closes T4 triode to PWM_CTL output low level, its collector voltage is made to become high level, thus make 5 pin of LM2576 become high level, then LM2576 closes, system+5V power supply disappears, and instrument quits work, thus completes the automatic cut-out of instrument power.
After adopting above technical scheme: the utility model proposes a kind of commercial vehicle instrument power automatic shutdown circuitry, its turn-off function, on the basis of the internal electric source conversion chip LM2576 of existing instrument, adopts a small amount of control element to realize.Which overcome the cost increase problem adopting power source special managing chip to bring in existing commercial vehicle instrument, reduce the product cost realizing power supply automatic cut-off function, improve the price competitiveness of the type commercial vehicle instrument.
Claims (6)
1. the power supply automatic shutdown circuitry of a commercial vehicle instrument, comprise electric current output buck switching mode integrated stable voltage circuit (1), it is characterized in that: 1 pin (2) the access point ignition source (3) of described electric current output buck switching mode integrated stable voltage circuit (1) and anode (4), 3 pins (5) ground connection of described electric current output buck switching mode integrated stable voltage circuit (1), the first polarity free capacitor (6) and the first polar capacitor (7) is connected with successively between 1 pin (2) of described electric current output buck switching mode integrated stable voltage circuit (1) and the lead-in wire of 3 pins (5), 2 pins (8) of described electric current output buck switching mode integrated stable voltage circuit (1) export and connect to a parallel branch, described parallel branch is voltage stabilizing didoe (9), second polar capacitor (10) and the second polarity free capacitor (11), 5 pins (12) of described electric current output buck switching mode integrated stable voltage circuit (1) connect to control circuit.
2. the power supply automatic shutdown circuitry of a kind of commercial vehicle instrument according to claim 1, it is characterized in that: described control circuit comprises the triode (13) of input, the collector electrode (14) of described triode (13) is connected with 5 pins (12) of electric current output buck switching mode integrated stable voltage circuit (1), the base stage (15) of described triode (13) is connected with power supply output control terminal (17) by the first resistance (16), emitter (18) ground connection of described triode (13), base stage (15) second resistance (19) in parallel with between emitter (18) of described triode (13), the collector electrode (14) of described triode (13) is also connected to anode (4) by the 3rd resistance (20).
3. the power supply automatic shutdown circuitry of a kind of commercial vehicle instrument according to claim 1 and 2, is characterized in that: connected by inductance (21) between described voltage stabilizing didoe (9), the second polar capacitor (10).
4. the power supply automatic shutdown circuitry of a kind of commercial vehicle instrument according to claim 1 and 2, is characterized in that: 4 pins (22) of described electric current output buck switching mode integrated stable voltage circuit (1) connect between voltage stabilizing didoe (9), the second polar capacitor (10).
5. the power supply automatic shutdown circuitry of a kind of commercial vehicle instrument according to claim 2, it is characterized in that: the resistance of described first resistance (16) is 10K Ω, the resistance of described second resistance (19) is 10K Ω, and the resistance of described 3rd resistance (20) is 100K Ω.
6. the power supply automatic shutdown circuitry of a kind of commercial vehicle instrument according to claim 1 and 2, is characterized in that: the model of described electric current output buck switching mode integrated stable voltage circuit (1) is LM2576.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420227505.7U CN204068688U (en) | 2014-04-25 | 2014-04-25 | A kind of power supply automatic shutdown circuitry of commercial vehicle instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420227505.7U CN204068688U (en) | 2014-04-25 | 2014-04-25 | A kind of power supply automatic shutdown circuitry of commercial vehicle instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204068688U true CN204068688U (en) | 2014-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420227505.7U Expired - Fee Related CN204068688U (en) | 2014-04-25 | 2014-04-25 | A kind of power supply automatic shutdown circuitry of commercial vehicle instrument |
Country Status (1)
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| CN (1) | CN204068688U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108556632A (en) * | 2018-06-10 | 2018-09-21 | 重庆三三电器股份有限公司 | A kind of intelligence TFT instrument screen intensity wake-up circuits and its control method |
-
2014
- 2014-04-25 CN CN201420227505.7U patent/CN204068688U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108556632A (en) * | 2018-06-10 | 2018-09-21 | 重庆三三电器股份有限公司 | A kind of intelligence TFT instrument screen intensity wake-up circuits and its control method |
| CN108556632B (en) * | 2018-06-10 | 2023-08-25 | 重庆三三电器股份有限公司 | Intelligent TFT instrument screen brightness wake-up circuit and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 Termination date: 20160425 |