CN208539566U - Terminal protecting circuit is grounded when a kind of reverse power connection of high-power drive circuit - Google Patents
Terminal protecting circuit is grounded when a kind of reverse power connection of high-power drive circuit Download PDFInfo
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- CN208539566U CN208539566U CN201821230878.4U CN201821230878U CN208539566U CN 208539566 U CN208539566 U CN 208539566U CN 201821230878 U CN201821230878 U CN 201821230878U CN 208539566 U CN208539566 U CN 208539566U
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- 239000004065 semiconductor Substances 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The utility model is grounded terminal protecting circuit when providing a kind of reverse power connection of high-power drive circuit；Including power device U1, ground connection terminal protecting circuit, output terminal protecting circuit; the VBB pin of power device U1 is connect with+24V power supply; the IN pin of power device U1 is connect by diode with port P1; the ST pin of power device U1 is connect with by resistance R5 with port P2; the GND pin of power device U1 is connect with ground terminal GNDB; the OUT pin of power device U1 is connect with the port D01; the ground terminal protection is electrically connected on+24V power supply, and the output terminal protecting circuit is connect with the port DO1.The utility model passes through the N-type metal-oxide-semiconductor of conducting resistance very little, cooperates corresponding protection circuit, realizes ground terminal protection when reverse power connection, avoids causing circuit to damage when reverse power connection.
Description
Technical field
The utility model relates to be grounded terminal protecting circuit when a kind of reverse power connection of high-power drive circuit.
Background technique
In high-power driving, if using metal-oxide-semiconductor as output stage, due to having body diode, when power supply is anti-
Will cause the damage of circuit when connecing, common method is series diode or fuse, series diode can be used only in electric current compared with
Small occasion, concatenation insurance is erroneous for installation, needs replacing.
Utility model content
In order to solve the above technical problems, ground connection when the utility model provides a kind of reverse power connection of high-power drive circuit
Terminal protecting circuit.
The utility model is achieved by the following technical programs.
Terminal protecting circuit is grounded when a kind of reverse power connection of high-power drive circuit provided by the utility model；Including power
Device U1, ground connection terminal protecting circuit, output terminal protecting circuit, the VBB pin of power device U1 are connect with+24V power supply, power device
The IN pin of part U1 is connect by diode with port P1, and the ST pin of power device U1 connects with by resistance R5 and port P2
It connects, the GND pin of power device U1 is connect with ground terminal GNDB, and the OUT pin of power device U1 is connect with the port D01, described
Ground terminal protection is electrically connected on+24V power supply, and the output terminal protecting circuit is connect with the port DO1.
The ground connection terminal protecting circuit includes metal-oxide-semiconductor T1, the grid and resistance R1 and zener diode Z1 of the metal-oxide-semiconductor T1
Cathode connect jointly, the other end of resistance R1 is connect with+24V power supply, and the anode and the source electrode of metal-oxide-semiconductor of zener diode Z1 is total
With access ground terminal GNDB, the drain electrode of metal-oxide-semiconductor is connect with ground terminal GND.
The OUT pin of the power device U1 is also connect with the cathode of diode D3, the anode and ground terminal of diode D3
GNDB connection.
The output terminal protecting circuit includes resistance R3, and the both ends of resistance R3 are connect with the port DO1 and the port AD1 respectively,
The port AD1 is connect after also passing through resistance R4, zener diode Z2, capacitor C1 parallel connection with ground terminal GNDB.
The port P2 is also connect by diode D2 and resistance R2 with+3V3 power supply respectively.
Described P1, P2 are respectively the status port of the I/O mouth and CPU of CPU.
The DO1 and AD1 is respectively the end and state-detection end of the output of circuit.
The utility model has the beneficial effects that: passing through the N-type metal-oxide-semiconductor of conducting resistance very little, cooperate corresponding protection circuit,
It realizes ground terminal protection when reverse power connection, avoids causing circuit to damage when reverse power connection.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Specific embodiment
Be described further below the technical solution of the utility model, but claimed range be not limited to it is described.
Terminal protecting circuit is grounded when a kind of reverse power connection of high-power drive circuit；It is protected including power device U1, ground terminal
The VBB pin of protection circuit, output terminal protecting circuit, power device U1 is connect with+24V power supply, and the IN pin of power device U1 is logical
It crosses diode to connect with port P1, the ST pin of power device U1 is connect with by resistance R5 with port P2, power device U1's
GND pin is connect with ground terminal GNDB, and the OUT pin of power device U1 is connect with the port D01, and the ground connection terminal protecting circuit connects
It connects on+24V power supply, the output terminal protecting circuit is connect with the port DO1.
The ground connection terminal protecting circuit includes metal-oxide-semiconductor T1, the grid and resistance R1 and zener diode Z1 of the metal-oxide-semiconductor T1
Cathode connect jointly, the other end of resistance R1 is connect with+24V power supply, and the anode and the source electrode of metal-oxide-semiconductor of zener diode Z1 is total
With access ground terminal GNDB, the drain electrode of metal-oxide-semiconductor is connect with ground terminal GND.
The OUT pin of the power device U1 is also connect with the cathode of diode D3, the anode and ground terminal of diode D3
GNDB connection.
The output terminal protecting circuit includes resistance R3, and the both ends of resistance R3 are connect with the port DO1 and the port AD1 respectively,
The port AD1 is connect after also passing through resistance R4, zener diode Z2, capacitor C1 parallel connection with ground terminal GNDB.
The port P2 is also connect by diode D2 and resistance R2 with+3V3 power supply respectively.
Described P1, P2 are respectively the status port of the I/O mouth and CPU of CPU.
The DO1 and AD1 is respectively the end and state-detection end of the output of circuit.
Circuit composition and working principle: ground terminal is protected when metal-oxide-semiconductor T1, zener diode Z1, resistance R1 composition reverse power connection
Circuit, zener diode Z1 and resistance R1 guarantee that the voltage between the grid and source electrode of metal-oxide-semiconductor in 10V or so, protects metal-oxide-semiconductor
T1。
P1 is the I/O port of cpu, when P1 output is high level, drives smart power device U1 by diode D1, from
The resistive or inductive load of port DO1 output driving 10A or so, such as headlight, solenoid valve.By to state end P2 and output end
Detection, open circuit, short circuit, the superheat state of circuit can be obtained, can be sent these states by bus, as therefore
Barrier alarm, while output can be controlled by P1, protect periphery circuit not to be burned out.Resistance R5, R2 and diode D1
It forms state-detection and protects circuit；D3 is the freewheeling circuit of inductive load；Resistance R3, resistance R4, zener diode Z1, capacitor C1
Form state output terminal detection and protection circuit.
Claims (7)
1. being grounded terminal protecting circuit when a kind of reverse power connection of high-power drive circuit, it is characterised in that: including power device U1,
It is grounded terminal protecting circuit, output terminal protecting circuit, the VBB pin of power device U1 is connect with+24V power supply, power device U1's
IN pin is connect by diode with port P1, and the ST pin of power device U1 is connect with by resistance R5 with port P2, power
The GND pin of device U1 is connect with ground terminal GNDB, and the OUT pin of power device U1 is connect with the port D01, and the ground terminal is protected
Protection circuit is connected on+24V power supply, and the output terminal protecting circuit is connect with the port DO1.
2. being grounded terminal protecting circuit when the reverse power connection of high-power drive circuit as described in claim 1, it is characterised in that: institute
Stating ground connection terminal protecting circuit includes metal-oxide-semiconductor T1, and the cathode of the grid and resistance R1 and zener diode Z1 of the metal-oxide-semiconductor T1 is common
Connection, the other end of resistance R1 are connect with+24V power supply, and the source electrode of the anode and metal-oxide-semiconductor of zener diode Z1 accesses ground connection jointly
GNDB is held, the drain electrode of metal-oxide-semiconductor is connect with ground terminal GND.
3. being grounded terminal protecting circuit when the reverse power connection of high-power drive circuit as described in claim 1, it is characterised in that: institute
The OUT pin for stating power device U1 is also connect with the cathode of diode D3, and the anode of diode D3 is connect with ground terminal GNDB.
4. being grounded terminal protecting circuit when the reverse power connection of high-power drive circuit as described in claim 1, it is characterised in that: institute
Stating output terminal protecting circuit includes resistance R3, and the both ends of resistance R3 are connect with the port DO1 and the port AD1 respectively, and the port AD1 is also logical
It is connect after crossing resistance R4, zener diode Z2, capacitor C1 parallel connection with ground terminal GNDB.
5. being grounded terminal protecting circuit when the reverse power connection of high-power drive circuit as described in claim 1, it is characterised in that: institute
Port P2 is stated also to connect by diode D2 and resistance R2 with+3V3 power supply respectively.
6. being grounded terminal protecting circuit when the reverse power connection of high-power drive circuit as described in claim 1, it is characterised in that: institute
State the status port that P1, P2 are respectively the I/O mouth and CPU of CPU.
7. being grounded terminal protecting circuit when the reverse power connection of high-power drive circuit as described in claim 1, it is characterised in that: institute
State DO1 and AD1 be respectively circuit output end and state-detection end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821230878.4U CN208539566U (en) | 2018-08-01 | 2018-08-01 | Terminal protecting circuit is grounded when a kind of reverse power connection of high-power drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821230878.4U CN208539566U (en) | 2018-08-01 | 2018-08-01 | Terminal protecting circuit is grounded when a kind of reverse power connection of high-power drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208539566U true CN208539566U (en) | 2019-02-22 |
Family
ID=65385093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821230878.4U Active CN208539566U (en) | 2018-08-01 | 2018-08-01 | Terminal protecting circuit is grounded when a kind of reverse power connection of high-power drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208539566U (en) |
-
2018
- 2018-08-01 CN CN201821230878.4U patent/CN208539566U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 249, Baiyun North Road, Baiyun District, Guiyang City, Guizhou Province Patentee after: Guiyang Yongqing Intelligent Control Technology Co.,Ltd. Address before: No. 249, Baiyun North Road, Baiyun District, Guiyang City, Guizhou Province Patentee before: GUIYANG YONGQING INSTRUMENTS & ELECTRONIC SCIENCEAND TECHNOLOGY Co.,Ltd. |