CN205355781U - Area is to ground short -circuit protection's high limit drive circuit - Google Patents
Area is to ground short -circuit protection's high limit drive circuit Download PDFInfo
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- CN205355781U CN205355781U CN201620149245.5U CN201620149245U CN205355781U CN 205355781 U CN205355781 U CN 205355781U CN 201620149245 U CN201620149245 U CN 201620149245U CN 205355781 U CN205355781 U CN 205355781U
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Abstract
The utility model discloses an area is to ground short -circuit protection's high limit drive circuit, including power supply, drive circuit, control switch and to ground short -circuit protection circuit, drive circuit is including connecting first switch tube and messenger's ability between power supply and the external load the second switch pipe that first switch tube switched on, control switch makes the ability the second switch piping leads to, include to ground short -circuit protection circuit that yin, yang the two poles of the earth connect respectively external load with the second switch pipe makes the diode that can hold. The utility model discloses an area is to ground short -circuit protection's high limit drive circuit builds high limit drive circuit through the discrete component, increases ground short -circuit protection circuit at the delivery outlet simultaneously, through the automatic real -time supervision delivery outlet shorted to earth condition of hardware circuit to when monitoring the delivery outlet shorted to earth, turn -off drive circuit automatically, adaptable long -time short circuit, and do not damage drive circuit. Treat the short circuit and dismantle back, drive circuit automatic recovery normal condition.
Description
Technical field
This utility model relates to vehicle-mounted for electrical domain, particularly to a kind of flash drive circuit with shorted to earth protection.
Background technology
At present flash on the market drives (HighSideDriver) to adopt integrated driving chip more, and this kind of flash drives, and its driving force is strong, and carries defencive function, but price relatively want expensive a lot.Currently also there is the flash drive circuit that the discrete component of some low costs is built; but it is when shorted to earth is protected, and drive circuit is still in duty, there is the risk damaging circuit in long-time short circuit; and energy consumption and temperature rise would generally be improved during short circuit, whole control system is had undesirable effect.
Summary of the invention
The purpose of this utility model is the defect in order to overcome above-mentioned background technology, it is provided that a kind of flash drive circuit with shorted to earth protection.
A kind of flash drive circuit with shorted to earth protection; circuit is protected including power supply, drive circuit, control switch and shorted to earth; described drive circuit includes the first switching tube being connected between described power supply and external loading and the second switch pipe enabling described first switching tube conducting; the described switch that controls enables the conducting of described second switch pipe, and described shorted to earth protection circuit includes yin, yang the two poles of the earth and connects described external loading and the diode of described second switch pipe Enable Pin respectively.
Further, described first switching tube, second switch pipe respectively PNP triode, NPN audion, described first switching tube emitter and collector connects described power supply and external loading respectively, base stage is connected with the colelctor electrode of described second switch pipe, and the base stage of described second switch pipe and emitter stage connect described control respectively and switch and ground connection.
Further, it is connected to the first resistance between described first switching tube base stage and second switch pipe collector.
Further, it is connected to the second resistance between base stage and the emitter stage of described second switch pipe.
Further, it is connected to the 3rd resistance between base stage and the described diode anode of described second switch pipe.
Further, described control is connected to the 4th resistance between switch and described diode anode.
Further, it is connected to filter circuit between described external loading and described diode cathode.
Further, described filter circuit includes the first electric capacity and the 5th resistance, described first electric capacity one end ground connection, and the other end connects the node between described external loading and described diode cathode, and described 5th resistance two ends are connected with described first electric capacity two ends respectively.
Flash drive circuit with shorted to earth protection of the present utility model; flash drive circuit is built by discrete component; increase shorted to earth protection circuit at delivery outlet simultaneously; by hardware circuit auto-real-time monitoring delivery outlet shorted to earth situation, and when monitoring delivery outlet shorted to earth, automatically shut down drive circuit; pipe is now driven to be off state; reduce energy consumption and temperature rise, be suitable for long-time short circuit, and do not damage drive circuit.After short circuit is removed, drive circuit recovers normal condition automatically.
Accompanying drawing explanation
Fig. 1 is the module principle figure in an embodiment of the present utility model.
Fig. 2 is the circuit theory diagrams in an embodiment of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, a kind of flash drive circuit with shorted to earth protection of the present utility model is further described.
A kind of flash drive circuit with shorted to earth protection, as shown in Figure 1, including power supply POWER, drive circuit 1, control switch CTRL and shorted to earth protection circuit 2, wherein, drive circuit 1 utilizes power supply POWER that external loading 3 is powered under the high level controlling switch CTRL enables, shorted to earth protection circuit 2 is then arranged between drive circuit 1 and load, it is operated also according to the control signal controlling switch CTRL, when external loading 3 shorted to earth, shorted to earth protection circuit 2 is then that drive circuit 1 temporarily ceases supplying power for outside, enter short-circuit protection state, supplying power for outside is recovered when short-circuit conditions automatically controls drive circuit 1 after getting rid of.
Concrete; as shown in Figure 2; drive circuit 1 includes the first switching tube Q1 being connected between power supply POWER and the external loading 3 and second switch pipe Q2 enabling the first switching tube Q1 conducting; controlling switch CTRL and enable second switch pipe Q2 conducting, shorted to earth protection circuit 2 includes yin, yang the two poles of the earth and connects external loading 3 and the diode of second switch pipe Q2 Enable Pin respectively.
In the present embodiment, first switching tube Q1, second switch pipe Q2 respectively PNP triode, NPN audion, first switching tube Q1 emitter and collector connects power supply POWER and external loading 3 respectively, base stage is connected with the colelctor electrode of second switch pipe Q2, and the base stage of second switch pipe Q2 and emitter stage connect control switch CTRL and ground connection respectively.
Under preferable case, between base stage and the colelctor electrode of second switch pipe Q2 of the first switching tube Q1, it is connected to the first resistance R1 for current limliting.
Under preferable case, more stable in order to be the second switch pipe Q2 enable signal received, it is connected to the second resistance R2 between base stage and the emitter stage of second switch pipe Q2.It addition, be connected to the 3rd resistance R3 for dividing potential drop between base stage and the diode anode of second switch pipe Q2.
Under preferable case, for protection control switch CTRL, improve the antistatic jamming performance of circuit, control to be connected to the 4th resistance R4 between switch CTRL and diode anode.
In preferred embodiment, more stable in order to ensure the output to external loading 3, it is connected to filter circuit between external loading 3 and diode cathode.In the present embodiment, filter circuit is made up of the first electric capacity and the 5th resistance, first electric capacity one end ground connection, and the other end connects the node between described external loading and described diode cathode, and described 5th resistance two ends are connected with the first electric capacity two ends respectively.5th resistance provides current drain path for the first electric capacity C1, and at the first switching tube Q1 shutdown moment, the voltage in the first electric capacity can be released by the 5th resistance R5.
In preferred embodiment, controlling switch CTRL can be processor, can send low and high level by its I/O pin and realize the enable to drive circuit 1.In principle, as long as the electronic device that can realize low and high level output all can be used as control switch CTRL use.
Operation principle of the present utility model is as follows:
Time normally-open:
Control switch CTRL and export high level, and through the 4th resistance R4, the 3rd resistance R3, second resistance R2, the 5th resistance R5, after diode D1 dividing potential drop so that the base voltage of second switch pipe Q2 is more than 0.7V, and second switch pipe Q2 opens and enter saturation conduction state.After second switch pipe Q2 conducting, power supply POWER is through the emitter stage of the first switching tube Q1, first resistance R1 and second switch pipe Q2 forms path, the first switching tube Q1 is made to enter saturation conduction state, the now emitter and collector voltage approximately equal of the first switching tube Q1, OUTPUT foot output high level drives loaded work piece.After normal operation, owing to the cathode voltage of diode D1 is higher than the anode voltage of diode D1, so now diode D1 is in cut-off state.
During normal switching-off:
Control switch CTRL and export low-voltage, and through the 4th resistance R4,3rd resistance R3, after second resistance R2 dividing potential drop so that the base voltage of second switch pipe Q2 ends less than 0.7V, second switch pipe Q2, after second switch pipe Q2 cut-off, first switching tube Q1 base current loop disappears, and the first switching tube Q1 cut-off, circuit is closed.
During shorted to earth:
When whole circuit is in Normal on state, if external loading 3 shorted to earth, the cathode voltage of diode D1 is clamped as 0V, controlling the high level voltage of switch CTRL output after the 4th resistance R4, diode D1 dividing potential drop, the anode voltage of diode D1 is clamped as 0.7V, the anode of diode D1 is through the 3rd resistance R3, after second resistance R2 dividing potential drop so that the base voltage of second switch pipe Q2 ends less than 0.7V, second switch pipe Q2.After second switch pipe Q2 cut-off, the first switching tube Q1 base current loop disappears, the first switching tube Q1 cut-off, thus promoting drive circuit 1 to quit work, and then protection drive circuit 1 is not damaged by when shorted to earth.
After shorted to earth is cancelled:
The negative electrode of diode D1 no longer by embedding for 0V, control the high level of switch CTRL output, through resistance the 4th resistance R4,3rd resistance R3, second resistance R2, the 5th resistance R5, after diode D1 dividing potential drop, the base voltage making second switch pipe Q2 recovers open and enter saturation conduction state more than 0.7V, second switch pipe Q2.After second switch pipe Q2 conducting, power supply POWER is through the emitter stage of the first switching tube Q1, first resistance R1 and second switch pipe Q2 forms path, the first switching tube Q1 is made to enter saturation conduction state, the now emitter and collector voltage approximately equal of the first switching tube Q1, external loading is exported by drive circuit 1, recovers normal operation.
Above in conjunction with accompanying drawing, embodiment of the present utility model is explained in detail, but this utility model is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, it is also possible to make various change under the premise without departing from this utility model objective.
Claims (8)
1. the flash drive circuit with shorted to earth protection; it is characterized in that: include power supply, drive circuit, control switch and shorted to earth protection circuit; described drive circuit includes the first switching tube being connected between described power supply and external loading and the second switch pipe enabling described first switching tube conducting; the described switch that controls enables the conducting of described second switch pipe, and described shorted to earth protection circuit includes yin, yang the two poles of the earth and connects described external loading and the diode of described second switch pipe Enable Pin respectively.
2. the flash drive circuit with shorted to earth protection as claimed in claim 1; it is characterized in that; described first switching tube, second switch pipe respectively PNP triode, NPN audion; described first switching tube emitter and collector connects described power supply and external loading respectively; base stage is connected with the colelctor electrode of described second switch pipe, and the base stage of described second switch pipe and emitter stage connect described control respectively and switch and ground connection.
3. the flash drive circuit with shorted to earth protection as claimed in claim 2, it is characterised in that be connected to the first resistance between described first switching tube base stage and second switch pipe collector.
4. the flash drive circuit with shorted to earth protection as claimed in claim 2, it is characterised in that be connected to the second resistance between base stage and the emitter stage of described second switch pipe.
5. the flash drive circuit with shorted to earth protection as claimed in claim 2, it is characterised in that be connected to the 3rd resistance between base stage and the described diode anode of described second switch pipe.
6. the flash drive circuit with shorted to earth protection as claimed in claim 2, it is characterised in that be connected to the 4th resistance between described control switch and described diode anode.
7. the flash drive circuit with shorted to earth protection as claimed in claim 2, it is characterised in that be connected to filter circuit between described external loading and described diode cathode.
8. the flash drive circuit with shorted to earth protection as claimed in claim 7; it is characterized in that; described filter circuit includes the first electric capacity and the 5th resistance; described first electric capacity one end ground connection; the other end connects the node between described external loading and described diode cathode, and described 5th resistance two ends are connected with described first electric capacity two ends respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620149245.5U CN205355781U (en) | 2016-02-29 | 2016-02-29 | Area is to ground short -circuit protection's high limit drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620149245.5U CN205355781U (en) | 2016-02-29 | 2016-02-29 | Area is to ground short -circuit protection's high limit drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205355781U true CN205355781U (en) | 2016-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620149245.5U Active CN205355781U (en) | 2016-02-29 | 2016-02-29 | Area is to ground short -circuit protection's high limit drive circuit |
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| Country | Link |
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| CN (1) | CN205355781U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111146761A (en) * | 2020-02-27 | 2020-05-12 | 科博达技术股份有限公司 | High-side switch circuit with grounding loss protection function |
-
2016
- 2016-02-29 CN CN201620149245.5U patent/CN205355781U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111146761A (en) * | 2020-02-27 | 2020-05-12 | 科博达技术股份有限公司 | High-side switch circuit with grounding loss protection function |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |