CN208461440U - A kind of overcurrent protective switch circuit - Google Patents
A kind of overcurrent protective switch circuit Download PDFInfo
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- CN208461440U CN208461440U CN201821197523.XU CN201821197523U CN208461440U CN 208461440 U CN208461440 U CN 208461440U CN 201821197523 U CN201821197523 U CN 201821197523U CN 208461440 U CN208461440 U CN 208461440U
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Abstract
A kind of overcurrent protective switch circuit belongs to electronic engineering field, more particularly to a kind of overcurrent protective switch circuit realized based on high-voltage switch gear control chip in aviation airborne equipment field.The utility model takes scheme are as follows: controls chip using high-voltage switch gear, controls the grid voltage of high-power FET, so that the drain-source electrode current of high-power FET is flowed through in control.Overcurrent protective switch circuit realizes overcurrent protection function by setting overcurrent sampling resistor value, the current value of high-power FET is flowed through by the sampling resistor monitoring in circuit, the setting of current limliting time is realized by external capacitor, high-power FET is turned off when overcurrent condition occurs and is more than the current limliting time, realize the protection to late-class circuit, the utility model has the following beneficial effects: controlling chip by high-voltage switch gear, control the grid voltage of high-power FET, real-time current detection is carried out using current-limiting resistance, high-power FET is turned off when overcurrent condition occurs and is more than the current limliting time, the size and the length of current limliting time of current-limiting points can be changed by adjusting current-limiting resistance.
Description
Technical field
A kind of overcurrent protective switch circuit of the utility model belongs to electronic engineering field, more particularly to sets in airborne
A kind of overcurrent protective switch circuit realized based on high-voltage switch gear control chip in standby field.
Background technique
In aviation airborne equipment, current protection technology is widely used in the conversion of single channel power supply, multiple power supplies output etc.
Multiple fields.Usually used overcurrent protective switch generally uses fuse or breaker form in airborne equipment, these realizations
The characteristics of form is: when overcurrent condition occurs, fuse or breaker fuse automatically, irrecoverable after fusing；Circuit structure
Volume is big.However at this stage in aviation field, airborne equipment for the control of multichannel High-current output and testing requirements increasingly
The overcurrent protective switch circuit of height, big voltage range, high current passability is rare, and in this context, this patent proposes one kind
Based on the overcurrent protective switch circuit structure that high-voltage switch gear control chip is realized, wide-voltage range, High-current output are realized with this
The overcurrent protective switch circuit of ability.
Utility model content
The purpose of this utility model: when proposing a kind of generation overcurrent condition, chip controls power is controlled by high-voltage switch gear
The conducting and shutdown of field-effect tube, and the solution party of the current limliting time before current limit point and high-power FET shutdown is set
Method.The adjustability of structure is strong, and voltage input output is detectable, small in size, saves area.More compared to conventional circuit structure
Succinctly, reliably, flexibly, it is economical.
The technical solution of the utility model includes: a kind of overcurrent protective switch circuit, the circuit includes high-voltage switch gear control core
Piece, current-limiting resistance R1, control two C of capacitor of current limliting time2, high-power FET VT1, two R of resistance2, three R of resistance3, resistance four
R4, five R of resistance5, one C of capacitor1, Zener diode D1；The first pin, the second pin of high-voltage switch gear control chip are separately connected
Current-limiting resistance R1Both ends, high-voltage switch gear control chip third pin connect two C of capacitor2, two C of capacitor2The other end ground connection,
Two R of the 4th pin series resistance of high-voltage switch gear control chip2After be connected to high-power FET VT1Grid, high-power field
Effect pipe VT1Source electrode and drain electrode be separately connected current-limiting resistance R1With the output end V of circuitOUT, four R of resistance4One end connects circuit
Output end VOUT, four R of resistance4The other end connect five R of resistance simultaneously5With the 5th pin of high-voltage switch gear control chip, resistance
Five R5Other end ground connection, one C of capacitor1One end connect three R of resistance3, one C of capacitor1The other end ground connection, three R of resistance3One end connect
Meet one C of capacitor1, three R of resistance3The other end connection high-voltage switch gear control chip the 4th pin, Zener diode D1Anode connect
Meet high-power FET VT1Source electrode, Zener diode D1Cathode be connected to high-voltage switch gear control chip the 4th pin；
High-voltage switch gear control chip controls high-power FET VT during the work time1Grid level, complete to main current path
Open and turn off, when over-current phenomenon avoidance occurs, high-voltage switch gear control chip to capacitor C2It charges, when charging to certain door
The chip of high-voltage switch gear control in limited time turns off VT1。
The high-voltage switch gear control chip uses the LT1641-2IS8 model chip of Linear company.
The high-power FET VT1Select the N-channel field-effect tube of the IRF540n of IR company.
The Zener diode D1Using southern exposure radio component Co., Ltd 1N6004B model diode.
Detailed description of the invention
Fig. 1 is the circuit structure of the utility model circuit.
Wherein, R1It is current-limiting resistance, C2It is the capacitor two for controlling the current limliting time, VT1It is high-power FET, R2It is electricity
Hinder two, R3It is resistance three, R4It is resistance four, R5It is resistance five, C1It is capacitor one, D1It is Zener diode；
Specific embodiment
It elaborates with reference to the accompanying drawings of the specification to the utility model.
A kind of overcurrent protective switch circuit, the circuit include high-voltage switch gear control chip, current-limiting resistance R1, control current limliting
Two C of capacitor of time2, high-power FET VT1, two R of resistance2, three R of resistance3, four R of resistance4, five R of resistance5, one C of capacitor1、
Zener diode D1；The first pin, the second pin of high-voltage switch gear control chip are separately connected current-limiting resistance R1Both ends, high pressure
The third pin of switch control chip connects two C of capacitor2, two C of capacitor2The other end ground connection, high-voltage switch gear control chip the 4th
Two R of pin series resistance2After be connected to high-power FET VT1Grid, high-power FET VT1Source electrode and drain electrode
It is separately connected current-limiting resistance R1With the output end V of circuitOUT, four R of resistance4The output end V of one end connection circuitOUT, four R of resistance4's
The other end connects five R of resistance simultaneously5With the 5th pin of high-voltage switch gear control chip, five R of resistance5Other end ground connection, one C of capacitor1
One end connect three R of resistance3, one C of capacitor1The other end ground connection, three R of resistance3One end connect one C of capacitor1, three R of resistance3It is another
One end connects the 4th pin of high-voltage switch gear control chip, Zener diode D1Anode connect high-power FET VT1Source
Pole, Zener diode D1Cathode be connected to high-voltage switch gear control chip the 4th pin；High-voltage switch gear control chip is working
High-power FET VT is controlled in the process1Grid level, complete opening and turning off to main current path, when occur overcurrent
When phenomenon, high-voltage switch gear controls chip to capacitor C2It charges, when charging to certain thresholding, high-voltage switch gear control chip is closed
Disconnected VT1。
The high-voltage switch gear control chip uses the LT1641-2IS8 model chip of Linear company.
The high-power FET selects the N-channel field-effect tube of the IRF540n of IR company.
The Zener diode uses southern exposure radio component Co., Ltd 1N6004B model diode.
Voltage and the electric current V from Fig. 1INBy current-limiting resistance R after the inflow of end1After flow through high-power FET VT1, this
Effect pipe has good heat dissipation and lower DC impedance, has high current through-current capability between source-drain electrode, passes through current-limiting resistance
R1Electric current be converted into voltage give high-voltage switch gear control chip, the control chip connect current-limiting resistance R1Both ends and external
Control the capacitor C of current limliting time2, and the grid level of voltage signal control field-effect tube is generated, turn on and off high-power field
Effect；Control the capacitor C of current limliting time2, one end connects high-voltage switch gear and controls chip, other end ground connection, when over-current state occurs
High-voltage switch gear controls chip to capacitor C2It charges, when charging to certain thresholding, high-voltage switch gear control chip shutdown is high-power
Field-effect VT1, by changing the capacitance, overcurrent can be set and occur to high-power field-effect to turn off the big of preceding current limliting time
It is small.The output V of circuitOUTPass through R4With R5Output voltage is fed back to high-voltage switch gear control chip by the feedback network of composition, is used for
Detect the voltage value of output.Capacitor C1For controlling VT1Gate voltage switches slope, R3For being carried out to current detecting loop
Loop compensation, R2For avoiding VT1The concussion of grid voltage, Zener diode D1For limiting VT1Pressure difference between grid source electrode.
When overcurrent condition occurs and is more than the current limliting time, high-voltage switch gear control chip turns off VT1, realize the protection to late-class circuit.
Embodiment
(1) aircraft demand excess flow switch technical indicator are as follows:
1. switcher input voltage is 28V；
2. maximum output current ability 7A；
3. receiving external switch signal turns on and off the passage current.
(2) design process:
1. main hardware forms:
A) high-voltage switch gear controls chip type selecting: high-voltage switch gear controls the LT1641-2IS8 core that chip selects Linear company
Piece can satisfy this system needs；
B) high-power FET type selecting: high-power FET selects IRF540n, the DC impedance 44m Ω of IR company,
Maximum current capacity 33A, maximum hourglass source electrode pressure resistance 100V meet this system needs；
C) Zener diode D1 type selecting: Zener diode uses southern exposure radio component Co., Ltd 1N6004B, clamper electricity
15V is pressed, this system needs are met.
2. resistance capacitance value designs
According to calculating, the current-limiting resistance R of selection1For 0.005 Ω, two R of resistance2For 10 Ω, resistance 3R3For 1K Ω, resistance four
R4For 59K Ω, five R of resistance5For 3.6K Ω, high-power FET VT is controlled1Gate voltage switches slope one C of capacitor1For
0.01UF controls two C of capacitor of current limliting time1For 0.68UF.
Claims (4)
1. a kind of overcurrent protective switch circuit, which is characterized in that the circuit includes high-voltage switch gear control chip, current-limiting resistance
(R1), control the two (C of capacitor of current limliting time2), high-power FET (VT1), two (R of resistance2), three (R of resistance3), resistance four
(R4), five (R of resistance5), one (C of capacitor1), Zener diode (D1)；The first pin, the second pin of high-voltage switch gear control chip
It is separately connected current-limiting resistance (R1) both ends, high-voltage switch gear control chip third pin connect two (C of capacitor2), two (C of capacitor2)
The other end ground connection, high-voltage switch gear control chip two (R of the 4th pin series resistance2) after be connected to high-power FET
(VT1) grid, high-power FET (VT1) source electrode and drain electrode be separately connected current-limiting resistance (R1) and circuit output end
(VOUT), four (R of resistance4) one end connection circuit output end (VOUT), four (R of resistance4) the other end connect five (R of resistance simultaneously5)
With the 5th pin of high-voltage switch gear control chip, five (R of resistance5) other end ground connection, one (C of capacitor1) one end connect resistance three
(R3), one (C of capacitor1) the other end ground connection, three (R of resistance3) one end connect one (C of capacitor1), three (R of resistance3) the other end connect
Meet the 4th pin of high-voltage switch gear control chip, Zener diode (D1) anode connect high-power FET (VT1) source
Pole, Zener diode (D1) cathode be connected to high-voltage switch gear control chip the 4th pin；High-voltage switch gear controls chip in work
High-power FET VT is controlled during making1Grid level, opening and turning off to main current path is completed, when occurring
When flow phenomenon, high-voltage switch gear controls chip to capacitor C2It charges, when charging to certain thresholding, high-voltage switch gear controls chip
Turn off VT1。
2. a kind of overcurrent protective switch circuit according to claim 1, which is characterized in that the high-voltage switch gear controls chip
Using the LT1641-2IS8 model chip of Linear company.
3. a kind of overcurrent protective switch circuit according to claim 1, which is characterized in that the high-power FET VT1
Select the N-channel field-effect tube of the IRF540n of IR company.
4. a kind of overcurrent protective switch circuit according to claim 1, which is characterized in that the Zener diode D1Using
Southern exposure radio component Co., Ltd 1N6004B model diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821197523.XU CN208461440U (en) | 2018-07-25 | 2018-07-25 | A kind of overcurrent protective switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821197523.XU CN208461440U (en) | 2018-07-25 | 2018-07-25 | A kind of overcurrent protective switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208461440U true CN208461440U (en) | 2019-02-01 |
Family
ID=65181023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821197523.XU Active CN208461440U (en) | 2018-07-25 | 2018-07-25 | A kind of overcurrent protective switch circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN208461440U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112448703A (en) * | 2019-08-27 | 2021-03-05 | 杭州海康威视数字技术股份有限公司 | Switching device |
| CN113258538A (en) * | 2021-06-30 | 2021-08-13 | 深圳英集芯科技股份有限公司 | Power output protection method and circuit |
-
2018
- 2018-07-25 CN CN201821197523.XU patent/CN208461440U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112448703A (en) * | 2019-08-27 | 2021-03-05 | 杭州海康威视数字技术股份有限公司 | Switching device |
| CN112448703B (en) * | 2019-08-27 | 2023-07-28 | 杭州海康威视数字技术股份有限公司 | Switching device |
| CN113258538A (en) * | 2021-06-30 | 2021-08-13 | 深圳英集芯科技股份有限公司 | Power output protection method and circuit |
| CN113258538B (en) * | 2021-06-30 | 2021-09-28 | 深圳英集芯科技股份有限公司 | Power output protection method and circuit |
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