CN210669504U - Protection circuit based on system on chip - Google Patents
Protection circuit based on system on chip Download PDFInfo
- Publication number
- CN210669504U CN210669504U CN201921561363.7U CN201921561363U CN210669504U CN 210669504 U CN210669504 U CN 210669504U CN 201921561363 U CN201921561363 U CN 201921561363U CN 210669504 U CN210669504 U CN 210669504U
- Authority
- CN
- China
- Prior art keywords
- triode
- diode
- resistor
- protection circuit
- chip
- 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.)
- Active
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a protection circuit based on system on chip; when short circuit occurs, the collector of the second triode is pulled down, the base of the first triode receives low level and starts to be conducted, and then the base voltage of the second triode is pulled up by the cooperation of the first triode and the second capacitor, so that the collector of the second triode is cut off, no electric energy is output, and self-locking is formed at the same time; then, even if the external load is disconnected with the collector of the second triode, no electric energy is output, and the normal working state can be recovered only by disconnecting the power supply from the protection circuit based on the system on chip; the circuit is simple, low in cost, small in size, capable of being restored after short circuit occurs, and wide in applicability.
Description
Technical Field
The utility model relates to a short-circuit protection technical field, more specifically say, relate to a protection circuit based on system on chip.
Background
The protection circuit of the existing system on chip mostly uses a fuse to perform overcurrent and short-circuit protection, once overcurrent or short-circuit conditions occur, the fuse is blown and cannot be recovered, needs to be manually replaced and then used, and cannot meet the use requirements of people.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a circuit simple, with low costs, small, recoverable protection circuit based on system on chip after the short circuit takes place.
The utility model provides a technical scheme that its technical problem adopted is:
constructing a protection circuit based on a system on chip, which comprises a first triode and a second triode; the transmitters of the first triode and the second triode are both connected with the positive electrode of a power supply, the base electrode of the first triode and the transmitter are connected in parallel to form a first capacitor, and the base electrode of the second triode and the transmitter are connected in parallel to form a second capacitor; the collector of the first triode is connected with the base of the second triode and is also connected with a first resistor, and the other end of the first resistor is grounded; the base electrode of the first triode is connected with a second resistor, the other end of the second resistor is connected with the collector electrode of the second triode and is also connected with a third resistor, and the other end of the third resistor is grounded; and the collector of the second triode is the output end of the system-on-chip protection circuit.
The utility model discloses a protection circuit based on system on chip, wherein, the positive pole of power still is connected with first diode and third triode; the negative electrode of the first diode is connected with the positive electrode of the power supply, and the transmitter of the third triode is connected with the positive electrode of the power supply; a base electrode of the third triode is connected with a fourth resistor in parallel with the transmitter, the base electrode is also connected with a fifth resistor, and the other end of the fifth resistor is connected with the anode of the first diode; the anode of the first diode is also connected with a third capacitor, and the other end of the third capacitor is grounded.
The utility model discloses a protection circuit based on system on chip, wherein, the output of protection circuit based on system on chip still is connected with the second diode, the positive pole of second diode with the output of protection circuit based on system on chip is connected, the negative pole of second diode is connected with external load equipment; the cathode of the second diode is also connected with a third diode, and the cathode of the third diode is connected with the cathode of the second diode; and the anode and the cathode of the third diode are connected with a sixth resistor in parallel.
Protection circuit based on system on chip, wherein, the collecting electrode and the transmitter of second triode are parallelly connected to have the seventh resistance.
The beneficial effects of the utility model reside in that: after the power is on, the first capacitor is quickly fully charged, then the base voltage of the second triode is reduced to a low level from a high level emitted by the first capacitor, the whole process needs 0.12ms, and after 0.12ms, the base of the first triode is pulled down, so that the first triode is in a conducting state; after the first triode is conducted, the collector outputs a high level to the base electrode of the second triode, and meanwhile, due to the existence of the second capacitor, the high level output by the collector of the first triode is absorbed by the second capacitor, namely, the second capacitor is charged, and the process of fully charging the second capacitor needs 0.17 ms; the base electrode of the second triode can receive a high level 0.17ms after power-on, meanwhile, due to the existence of the first resistor, the base electrode voltage of the second triode is pulled down, the second triode starts to conduct the collector electrode of the second triode to output electric energy, namely the output voltage of the collector electrode of the second triode reaches about 13.3V, power supply is started to be provided for an external load, the first triode is forced to be cut off, namely the base electrode of the first triode receives the high level;
when short circuit occurs, the collector of the second triode is pulled down, the base of the first triode receives low level and starts to be conducted, and then the base voltage of the second triode is pulled up by the cooperation of the first triode and the second capacitor, so that the collector of the second triode is cut off, no electric energy is output, and self-locking is formed at the same time; then, even if the external load is disconnected with the collector of the second triode, no electric energy is output, and the normal working state can be recovered only by disconnecting the power supply from the protection circuit based on the system on chip; the circuit is simple, low in cost, small in size, capable of being restored after short circuit occurs, and wide in applicability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments, wherein 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 without inventive work according to the drawings:
fig. 1 is a schematic circuit diagram of a protection circuit based on a system on a chip according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The protection circuit based on the system on chip of the preferred embodiment of the present invention is shown in fig. 1; the protection circuit based on the system on chip comprises a first triode Q2 and a second triode Q3; the emitters of the first triode Q2 and the second triode Q3 are both connected with the positive electrode of the power supply, the base electrode of the first triode Q2 is connected with the emitter in parallel to form a first capacitor C2, and the base electrode of the second triode Q3 is connected with the emitter in parallel to form a second capacitor C3; the collector of the first triode Q2 is connected with the base of the second triode Q3 and is also connected with a first resistor R3, and the other end of the first resistor R3 is grounded; the base electrode of the first triode Q2 is connected with a second resistor R4, the other end of the second resistor R4 is connected with the collector electrode of the second triode Q3 and is also connected with a third resistor R5, and the other end of the third resistor R5 is grounded; the collector of the second triode Q3 is the output end of the protection circuit based on the system on chip;
after the power is on, the first capacitor C2 is rapidly fully charged, then the base voltage of the second triode Q3 is reduced to a low level from a high level discharged by the first capacitor C2, the whole process needs 0.12ms, and after 0.12ms, the base of the first triode Q2 is pulled down, so that the first triode Q2 is in a conducting state; after the first triode Q2 is turned on, the collector outputs a high level to the base of the second triode Q3, and meanwhile, due to the existence of the second capacitor C3, the high level output by the collector of the first triode Q2 is absorbed by the second capacitor C3, that is, the second capacitor C3 is charged, and the process of fully charging the second capacitor C3 needs 0.17 ms; the base of the second triode Q3 can receive high level only 0.17ms after power up, meanwhile, due to the existence of the first resistor R3, the base voltage of the second triode Q3 is pulled low, the second triode Q3 starts to conduct the collector thereof to output electric energy, namely the output voltage of the collector of the second triode Q3 reaches about 13.3V, power supply is started to be provided for external loads, the first triode Q2 is forced to be cut off, namely the base of the first triode Q2 receives high level;
when short circuit occurs, the collector of the second triode Q3 is pulled down, the base of the first triode Q2 receives low level and starts to be conducted, and then the base voltage of the second triode Q3 is pulled up by the cooperation of the first triode Q2 and the second capacitor C3, so that the collector of the second triode Q3 is cut off, no electric energy is output, and self-locking is formed at the same time; then, even if the external load is disconnected with the collector of the second triode Q3, no power can be output, and the normal working state can be recovered only by disconnecting the power supply from the protection circuit based on the system on chip; the circuit is simple, low in cost, small in size, capable of being restored after short circuit occurs, and wide in applicability.
As shown in fig. 1, the positive electrode of the power supply is further connected with a first diode D1 and a third transistor D3; the cathode of the first diode D1 is connected with the anode of the power supply, and the transmitter of the third triode D3 is connected with the anode of the power supply; the base of the third triode D3 is connected in parallel with the emitter through a fourth resistor R1, the base is also connected with a fifth resistor R2, and the other end of the fifth resistor R2 is connected with the positive electrode of the first diode D1; the anode of the first diode D1 is also connected with a third capacitor C1, and the other end of the third capacitor C1 is grounded; the third transistor D3 prevents the first transistor Q2 from being turned on, i.e., the third transistor D3 is turned off after 5.84ms after power-up due to the presence of the third capacitor C1, i.e., the first transistor Q2 is further turned off by the third transistor D3 5.84ms after power-up, so as to ensure that the second transistor Q3 is continuously turned on during normal operation.
As shown in fig. 1, the output terminal of the protection circuit based on the system on chip is further connected to a second diode D2, the anode of the second diode D2 is connected to the output terminal of the protection circuit based on the system on chip, and the cathode of the second diode D2 is connected to the external load device; the cathode of the second diode D2 is also connected with a third diode D3, and the cathode of the third diode D3 is connected with the cathode of the second diode D2; the anode and the cathode of the third diode D3 are connected with a sixth resistor R6; the sixth resistor R6 divides the voltage of the third triode D3, and the second diode D2 protects the protection circuit based on the system on chip against reverse connection; the circuit is simple, low in cost and small in size.
As shown in fig. 1, the collector of the second transistor Q3 is connected in parallel with the transmitter by a seventh resistor (not shown); when a short circuit occurs, the output of the electric energy can be continuously kept after the short circuit condition disappears, and the power supply of the protection circuit based on the system on chip does not need to be disconnected.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (4)
1. A protection circuit based on a system on a chip comprises a first triode and a second triode; the power supply is characterized in that the transmitters of the first triode and the second triode are both connected with the positive electrode of the power supply, the base electrode of the first triode is connected with the transmitter in parallel to form a first capacitor, and the base electrode of the second triode is connected with the transmitter in parallel to form a second capacitor; the collector of the first triode is connected with the base of the second triode and is also connected with a first resistor, and the other end of the first resistor is grounded; the base electrode of the first triode is connected with a second resistor, the other end of the second resistor is connected with the collector electrode of the second triode and is also connected with a third resistor, and the other end of the third resistor is grounded; and the collector of the second triode is the output end of the system-on-chip protection circuit.
2. The system-on-chip based protection circuit according to claim 1, wherein a first diode and a third transistor are further connected to the positive electrode of the power supply; the negative electrode of the first diode is connected with the positive electrode of the power supply, and the transmitter of the third triode is connected with the positive electrode of the power supply; a base electrode of the third triode is connected with a fourth resistor in parallel with the transmitter, the base electrode is also connected with a fifth resistor, and the other end of the fifth resistor is connected with the anode of the first diode; the anode of the first diode is also connected with a third capacitor, and the other end of the third capacitor is grounded.
3. The system-on-chip based protection circuit according to claim 1, wherein a second diode is further connected to the output terminal of the system-on-chip based protection circuit, an anode of the second diode is connected to the output terminal of the system-on-chip based protection circuit, and a cathode of the second diode is connected to an external load device; the cathode of the second diode is also connected with a third diode, and the cathode of the third diode is connected with the cathode of the second diode; and the anode and the cathode of the third diode are connected with a sixth resistor in parallel.
4. The system-on-chip based protection circuit according to claim 1, wherein a seventh resistor is connected in parallel with the emitter and the collector of the second transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921561363.7U CN210669504U (en) | 2019-09-19 | 2019-09-19 | Protection circuit based on system on chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921561363.7U CN210669504U (en) | 2019-09-19 | 2019-09-19 | Protection circuit based on system on chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210669504U true CN210669504U (en) | 2020-06-02 |
Family
ID=70819493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921561363.7U Active CN210669504U (en) | 2019-09-19 | 2019-09-19 | Protection circuit based on system on chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210669504U (en) |
-
2019
- 2019-09-19 CN CN201921561363.7U patent/CN210669504U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101174770B (en) | Charging protection device | |
| CN105119365A (en) | Dual-channel DC power supply automatic switching device | |
| CN104682341A (en) | Over-voltage/low-voltage protective circuit | |
| CN218386788U (en) | Power-off circuit of low-voltage direct-current power supply | |
| CN103050932A (en) | Electronic switch circuit for power over Ethernet | |
| CN101783503B (en) | Overvoltage protection circuit | |
| CN208352960U (en) | A kind of power supply circuit with multiple protection functions | |
| CN208257490U (en) | A kind of photovoltaic energy storage device | |
| CN210669504U (en) | Protection circuit based on system on chip | |
| CN206135384U (en) | Short-circuit protector for DC power supply | |
| CN205039527U (en) | AC motor starting up overcurrent protector | |
| CN218335753U (en) | A ACU power strip for machine leads to equipment | |
| CN213027525U (en) | Power supply switching circuit | |
| CN215378425U (en) | Intelligent direct current power supply system | |
| CN202771295U (en) | Voltage stabilizing circuit | |
| CN204567528U (en) | North America version parking heating device power supply | |
| CN103683215A (en) | Short-circuit protection circuit of electronic switch | |
| CN104426143A (en) | Battery overvoltage absorbing circuit | |
| CN106532838A (en) | Internal circuit of charger of using USB interface of computer | |
| CN103401215A (en) | Over-voltage and under-voltage protection circuit, protection socket and terminal | |
| CN104065043A (en) | Battery under-voltage protection and display circuit | |
| CN206313426U (en) | A kind of short-circuit protector with warning function | |
| CN206640308U (en) | A kind of Vehicular power protective circuit | |
| CN217789651U (en) | Charging reset circuit with discrete element combination | |
| CN206041479U (en) | Short -circuit protective device(SCPD) based on photounit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518000 Guangdong city of Shenzhen province Futian District Che Kung Temple Tairan nine road Haisong building B-1303 Patentee after: Shenzhen smart Micro Intelligent Technology Co., Ltd Address before: 518000 Guangdong city of Shenzhen province Futian District Che Kung Temple Tairan nine road Haisong building B-1303 Patentee before: JWIPC TECHNOLOGY DEVELOPMENT Ltd. |
|
| CP01 | Change in the name or title of a patent holder |