CN206542179U - A kind of load overcurrent overvoltage crowbar - Google Patents
A kind of load overcurrent overvoltage crowbar Download PDFInfo
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- CN206542179U CN206542179U CN201720257200.4U CN201720257200U CN206542179U CN 206542179 U CN206542179 U CN 206542179U CN 201720257200 U CN201720257200 U CN 201720257200U CN 206542179 U CN206542179 U CN 206542179U
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Abstract
The utility model discloses a kind of load overcurrent overvoltage crowbar; including boost chip, central processor MCU, load equipment, on-off circuit, current sampling circuit and voltage sampling circuit, the enable signal EN of boost chip is by central processor MCU control, the GPO1 interfaces of connection central processor MCU；The voltage signal SW of boost chip output end connects the positive pole of load equipment, is powered to load equipment；The negative pole connecting valve circuit of load equipment is simultaneously by current sampling circuit ground connection, the signal output part of the input of control signal of central processor MCU connecting valve circuit, the signal output part of current sampling circuit and voltage sampling circuit.The utility model is when the sampled signal of current sampling circuit and/or voltage sampling circuit is when more than preset range; i.e. load equipment excessively stream or overvoltage when; central processor MCU controlling switch circuit is turned off; load equipment is set to open a way; damaged from load equipment is avoided; load equipment is played a protective role, and circuit is simple, cost is low.
Description
Technical field
The utility model is related to technical field of electronic equipment, more particularly to a kind of load overcurrent overvoltage crowbar.
Background technology
Display backlight circuit, electrolytic circuit etc. need higher voltage, it usually needs by cell voltage or the 5V of system
Boost in voltage is to 12V or higher, but when the moment accessed in load equipment or short circuit, and electric current is excessive, easily burns load and sets
It is standby.There is provided surging prevention and overcurrent protection to load equipment in the prior art, it is general using increase surging prevention chip and
Overcurrent protection chip, but this can increase circuit cost, and it is unfavorable for device miniaturization, increase research and development difficulty.
Utility model content
Technical problem to be solved in the utility model is to propose a kind of load overcurrent overvoltage crowbar, circuit letter
Single, cost is low, and over-current over-voltage protection effect can be played to load equipment.
To solve the above problems, the utility model uses following technical scheme：
A kind of load overcurrent overvoltage crowbar, including boost chip, central processor MCU, load equipment, switch electricity
Road, current sampling circuit and voltage sampling circuit, the enable signal EN of boost chip is in central processor MCU control, connection
Central processor MCU GPO1 interfaces；The voltage signal SW of boost chip output end connects the positive pole of load equipment, is set to load
Available electricity；The negative pole connecting valve circuit of load equipment is simultaneously grounded, central processor MCU connecting valve by current sampling circuit
The signal output part of the input of the control signal of circuit, the signal output part of current sampling circuit and voltage sampling circuit, in
Central processor MCU passes through the conducting according to current sampling circuit and/or the sampled signal controlling switch circuit of voltage sampling circuit
The turn-on and turn-off of load equipment are controlled with turning off.
Wherein, the on-off circuit includes an a NMOS tube Q1 and resistance R3, and the work internal resistance of load equipment is resistance R7,
The voltage signal SW of resistance R7 one end connection boost chip output end, resistance R7 other end connection NMOS tube Q1 leakage
Pole, NMOS tube Q1 grid connecting resistance R3 one end, the GPO2 interfaces of resistance R3 another termination central processor MCU, NMOS
Pipe Q1 source electrode connects current sampling circuit.
Wherein, the current sampling circuit includes a sampling resistor R1, sampling resistor R1 one end connection NMOS tube Q1's
Source electrode, sampling resistor R1 other end ground connection.
Wherein, in addition to a filter circuit, the signal output part of current sampling circuit is connected to by the filter circuit
The analog/digital conversion input interface ADC_IN1 of central processor MCU, the filter circuit includes an a resistance R6 and electric capacity C1, institute
State resistance R6 one end connection sampling resistor R1 one end, resistance R6 other end connection electric capacity C1 one end and central processing unit
MCU analog/digital conversion input interface ADC_IN1, electric capacity C1 other end ground connection.
Wherein, the voltage sampling circuit includes a resistance R4 and a resistance R5, resistance R5 one end connection boost chip
Voltage signal SW output end, the resistance R5 other end connects the analog/digital conversion input interface ADC_ of central processor MCU
IN2 and resistance R4 one end, resistance R4 other end ground connection.
Wherein, the voltage signal SW of boost chip output end connects resistance R7 by voltage-regulator diode D1 positive pole
One end and resistance R5 one end.
Wherein, in addition to a resistance R2, resistance R2 one end connection NMOS tube Q1 grid, resistance R2 another termination
Ground.
Wherein, the model FP6291 of the boost chip；The model STM32F103 of central processor MCU；NMOS tube
Q1 model AO3402.
Wherein, the span of the sampling resistor R1 is 0.2-1 Ω.
Wherein, the sampling resistor R1 is 0.49 Ω, and resistance R2 is 100K Ω, and resistance R3 is 2K Ω, and resistance R4 is 100K
Ω, resistance R5 are 499K Ω, and resistance R6 is 10K Ω, and electric capacity C1 is 100nF.
Compared with prior art, the beneficial effects of the utility model are：The utility model is passed through by central processor MCU
Load is controlled according to the conducting of current sampling circuit and/or the sampled signal controlling switch circuit of voltage sampling circuit and shut-off
The turn-on and turn-off of equipment, when the sampled signal of current sampling circuit and/or voltage sampling circuit is when more than corresponding default model
When enclosing, i.e. load equipment excessively stream or during overvoltage, the shut-off of central processor MCU controlling switch circuit makes load equipment open a way, from keeping away
Exempt from load equipment damage, load equipment is played a protective role, and circuit is simple, cost is low.
Brief description of the drawings
, below will be to the utility model embodiment in order to illustrate more clearly of the technical scheme in the utility model embodiment
The accompanying drawing used required in description is briefly described, it should be apparent that, drawings in the following description are only that this practicality is new
Some embodiments of type, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to the content and these accompanying drawings of the utility model embodiment.
Fig. 1 is a kind of circuit diagram for load overcurrent overvoltage crowbar that the utility model embodiment 1 is provided.
Embodiment
To make the utility model technical problem solved, the technical scheme used and the technique effect reached clearer,
The technical scheme of the utility model embodiment is described in further detail below in conjunction with accompanying drawing, it is clear that described reality
It is only a part of embodiment of the utility model to apply example, rather than whole embodiments.Based on the embodiment in the utility model,
The every other embodiment that those skilled in the art are obtained under the premise of creative work is not made, belongs to this practicality new
The scope of type protection.
1 pair of the utility model embodiment is described in further detail below in conjunction with the accompanying drawings.Figure Fig. 1 is the utility model tool
A kind of circuit diagram for load overcurrent overvoltage crowbar that body embodiment 1 is provided, as shown in Figure 1, in certain embodiments,
The load overcurrent overvoltage crowbar include boost chip 11, central processor MCU 12, load equipment 13, on-off circuit 14,
Current sampling circuit 15 and voltage sampling circuit 17, the enable signal EN of boost chip 11 controls by central processor MCU 12,
Connect the GPO1 interfaces of central processor MCU 12；The voltage signal SW of boost chip 11 output end connection load equipment 13
Positive pole, powers to load equipment 13；The negative pole connecting valve circuit 14 of load equipment 13 is simultaneously grounded by current sampling circuit 15,
The input of the control signal of the connecting valve circuit 14 of central processor MCU 12, the signal output part of current sampling circuit 15 and
The signal output part of voltage sampling circuit 17, central processor MCU 12 passes through according to current sampling circuit 15 and/or voltage sample
The conducting of the sampled signal controlling switch circuit 14 of circuit 17 controls the turn-on and turn-off of load equipment 13 with shut-off.
As shown in Figure 1, in some preferred implementations, the enable signal EN of boost chip 11 is by central processor MCU
12 controls, enable signal EN and put after height, and VCC_Boost has stable output, i.e. the voltage signal SW of boost chip 11 output end
There is stabilization to export and be delayed after certain time, central processor MCU 12 puts high SWITCH_ON, load equipment 13 and sample circuit
14 connections, form load circuit, and load equipment 13 works.Ensure that VCC_Boost has stable output just to connect load equipment 13, keep away
Exempting from VCC_Boost rising edge has fluctuation to cause the operation irregularity of load equipment 13.
In some preferred embodiments, on-off circuit 14 includes an a NMOS tube Q1 and resistance R3, load equipment 13
Work internal resistance is resistance R7, and resistance R7 one end connects the voltage signal SW of boost chip 11 output end, and resistance R7's is another
End connection NMOS tube Q1 drain electrode, NMOS tube Q1 grid connecting resistance R3 one end, resistance R3 another termination central processing unit
MCU GPO2 interfaces, NMOS tube Q1 source electrode connects current sampling circuit 15.
In some preferred embodiments, current sampling circuit 15 includes a sampling resistor R1, sampling resistor R1 one end
Connect NMOS tube Q1 source electrode, sampling resistor R1 other end ground connection.In some preferred embodiments, in addition to a filtered electrical
Road 16, the signal output part of current sampling circuit 15 be connected to by the filter circuit 16 mould of central processor MCU 12/
Number conversion input interface ADC_IN1, filter circuit 16 includes a resistance R6 and an electric capacity C1, resistance R6 one end connection sampling electricity
Hinder R1 one end, resistance R6 other end connection electric capacity C1 one end and the analog/digital conversion input interface of central processor MCU
ADC_IN1, electric capacity C1 other end ground connection.The current sampling circuit 16 that filter circuit 16 is obtained to central processor MCU 12
Output signal is filtered, and to obtain stable sampled result, makes judged result more accurate.
The work internal resistance of load equipment 13 is equivalent to R7, and SWITCH_ON puts resistance R7 and resistance R1 series connection after height, sampling electricity
Electric current is at stream, i.e. V_G：VCC_Boost/(R7+R1)；Voltage is R1*VCC_Boost/ (R7+R1), and the voltage is smaller, passes through
The RC filter circuits of resistance R6 and electric capacity C1 compositions enter the analog/digital conversion input interface ADC_ of central processor MCU 12
IN1, central processor MCU 12 can map out corresponding load equipment operating current table to judge electricity by the magnitude of voltage of sampling
Fluctuation situation is flowed, R1 immobilizes, when the internal resistance R7 of load equipment reduces, electric current increase, V_G voltages can increase, and MCU passes through
The increase of V_G voltages can determine whether out the increase of load equipment electric current, if load equipment electric current exceedes setting value, if desired carry out
Current protection, SWITCH_ON is set low can be load open circuit, it is to avoid load equipment is damaged.
In some preferred embodiments, voltage sampling circuit 17 includes an a resistance R4 and resistance R5, the one of resistance R5
The voltage signal SW of end connection boost chip 11 output end, the analog of resistance R5 other end connection central processor MCU turns
Change input interface ADC_IN2 and resistance R4 one end, resistance R4 other end ground connection.As shown in Figure 1, Boost_FB signals by
Obtained by R4, R5 partial pressure, central processor MCU 12 judges whether VCC_Boost is below or above partially by the level of this signal
Setting value, if below or above setting value, will not put high SWITCH_ON, allows load equipment without conducting loop, it is to avoid voltage mistake
When low, electric current, burning apparatus are taken out in load；Overtension is avoided, bearing voltage, equipment more than equipment is damaged.
In some preferred embodiments, the voltage signal SW of boost chip 11 output end is by voltage-regulator diode D1's
Positive pole connection resistance R7 one end and resistance R5 one end, voltage-regulator diode D1 make the voltage of the output of boost chip 11 more stably
It is applied on load equipment 13.
In some preferred embodiments, include a resistance R2, resistance R2 one end connection NMOS tube Q1 grid, electricity
R2 other end ground connection is hindered, resistance R2 can guarantee that the original state of NMOS tube Q1 in on-off circuit 14 is not turned on, it is to avoid because by mistake
Operation makes on-off circuit 14 turn on and load equipment 13 is damaged.
In some preferred embodiments, the model FP6291 of the boost chip 11；Central processor MCU 12
Model STM32F103；NMOS tube Q1 model AO3402.In some preferred embodiments, sampling resistor R1 value
Scope is 0.2-1 Ω.Suitable R1 values can be chosen according to the operating current of load equipment, load equipment current fluctuation can be made one
Determining also can normal work in scope.As a preferred embodiment, the sampling resistor R1 is 0.49 Ω, and resistance R2 is 100K
Ω, resistance R3 are 2K Ω, and resistance R4 is 100K Ω, and resistance R5 is 499K Ω, and resistance R6 is 10K Ω, and electric capacity C1 is 100nF.This
In only give a preferred embodiment, do not limited here for each component parameter.
The utility model passes through adopting according to current sampling circuit and/or voltage sampling circuit by central processor MCU
The conducting of sample signal control switch circuit controls the turn-on and turn-off of load equipment with shut-off, when current sampling circuit and/or
The sampled signal of voltage sampling circuit when more than corresponding preset range, i.e., load equipment excessively stream or overvoltage when, center processing
Device MCU controlling switches circuit is turned off, and load equipment is opened a way, from avoiding load equipment from damaging, and protection is played to load equipment and is made
With, and circuit is simple, cost is low.
Technical principle of the present utility model is described above in association with specific embodiment.These descriptions are intended merely to explain this reality
With new principle, and the limitation to the utility model protection domain can not be construed in any way, shown in accompanying drawing
Simply one of embodiment of the present utility model, actual structure is not limited thereto.Based on explanation herein, the skill of this area
Art personnel, which would not require any inventive effort, can associate other embodiments of the present utility model, and these modes are all
It will fall within protection domain of the present utility model.
Claims (10)
1. a kind of load overcurrent overvoltage crowbar, it is characterised in that including boost chip (11), central processor MCU (12),
Load equipment (13), on-off circuit (14), current sampling circuit (15) and voltage sampling circuit (17), boost chip (11) make
Energy signal EN is controlled by central processor MCU (12), the GPO1 interfaces of connection central processor MCU (12)；Boost chip (11)
Voltage signal SW output end connection load equipment (13) positive pole, give load equipment (13) power supply；Load equipment (13)
Negative pole connecting valve circuit (14) is simultaneously grounded, central processor MCU (12) connecting valve circuit by current sampling circuit (15)
(14) signal of the input of control signal, the signal output part of current sampling circuit (15) and voltage sampling circuit (17) is defeated
Go out end, central processor MCU (12) passes through the sampled signal according to current sampling circuit (15) and/or voltage sampling circuit (17)
The conducting of controlling switch circuit (14) controls the turn-on and turn-off of load equipment (13) with shut-off.
2. a kind of load overcurrent overvoltage crowbar as claimed in claim 1, it is characterised in that on-off circuit (14) bag
A NMOS tube Q1 and a resistance R3 are included, the work internal resistance of load equipment (13) is resistance R7, resistance R7 one end connection boosting core
The voltage signal SW of piece (11) output end, resistance R7 other end connection NMOS tube Q1 drain electrode, NMOS tube Q1 grid connects
Resistance R3 one end, the GPO2 interfaces of resistance R3 another termination central processor MCU (12), NMOS tube Q1 source electrode connects electric current
Sample circuit (15).
3. a kind of load overcurrent overvoltage crowbar as claimed in claim 2, it is characterised in that the current sampling circuit
(15) a sampling resistor R1, sampling resistor R1 one end connection NMOS tube Q1 source electrode, sampling resistor R1 another termination are included
Ground.
4. a kind of load overcurrent overvoltage crowbar as claimed in claim 3, it is characterised in that also including a filter circuit
(16), the signal output part of current sampling circuit (15) is connected to central processor MCU (12) by the filter circuit (16)
Analog/digital conversion input interface ADC_IN1, the filter circuit (16) include a resistance R6 and electric capacity a C1, the resistance R6
One end connection sampling resistor R1 one end, resistance R6 other end connection electric capacity C1 one end and central processor MCU (12)
Analog/digital conversion input interface ADC_IN1, electric capacity C1 the other end ground connection.
5. a kind of load overcurrent overvoltage crowbar as claimed in claim 4, it is characterised in that the voltage sampling circuit
(17) the voltage signal SW of a resistance R4 and a resistance R5, resistance R5 one end connection boost chip (11) output end is included,
The analog/digital conversion input interface ADC_IN2 and resistance R4 of resistance R5 other end connection central processor MCU (12) one end,
Resistance R4 other end ground connection.
6. a kind of load overcurrent overvoltage crowbar as claimed in claim 5, it is characterised in that the boost chip (11)
Voltage signal SW output end connects resistance R7 one end and resistance R5 one end by voltage-regulator diode D1 positive pole.
7. a kind of load overcurrent overvoltage crowbar as claimed in claim 6, it is characterised in that also including a resistance R2, electricity
Hinder R2 one end connection NMOS tube Q1 grid, resistance R2 other end ground connection.
8. a kind of load overcurrent overvoltage crowbar as claimed in claim 7, it is characterised in that the boost chip (11)
Model FP6291；The model STM32F103 of the central processor MCU (12)；NMOS tube Q1 model AO3402.
9. a kind of load overcurrent overvoltage crowbar as claimed in claim 7, it is characterised in that the sampling resistor R1's takes
Value scope is 0.2-1 Ω.
10. a kind of load overcurrent overvoltage crowbar as claimed in claim 9, it is characterised in that the sampling resistor R1 is
0.49 Ω, resistance R2 are 100K Ω, and resistance R3 is 2K Ω, and resistance R4 is 100K Ω, and resistance R5 is 499K Ω, and resistance R6 is 10K
Ω, electric capacity C1 are 100nF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720257200.4U CN206542179U (en) | 2017-03-16 | 2017-03-16 | A kind of load overcurrent overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720257200.4U CN206542179U (en) | 2017-03-16 | 2017-03-16 | A kind of load overcurrent overvoltage crowbar |
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| Publication Number | Publication Date |
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| CN206542179U true CN206542179U (en) | 2017-10-03 |
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| CN201720257200.4U Active CN206542179U (en) | 2017-03-16 | 2017-03-16 | A kind of load overcurrent overvoltage crowbar |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152633A (en) * | 2017-12-27 | 2018-06-12 | 北京安航达科技有限公司 | Non-specific devices Working state analysis control method based on current drain waveform |
| CN108767810A (en) * | 2018-08-31 | 2018-11-06 | 重庆惠科金渝光电科技有限公司 | A kind of current-limiting circuit and current-limiting apparatus |
| CN109659900A (en) * | 2018-12-25 | 2019-04-19 | 江苏威尔曼科技有限公司 | A kind of protection circuit for motor servo driver |
| WO2020042309A1 (en) * | 2018-08-31 | 2020-03-05 | 重庆惠科金渝光电科技有限公司 | Current limiting circuit, current limiting device, and display device |
| US11018500B2 (en) | 2018-08-31 | 2021-05-25 | Chongqing Hkc Optoelectronics Technology Co., Ltd. | Current-limiting circuit, current-limiting device and display device |
-
2017
- 2017-03-16 CN CN201720257200.4U patent/CN206542179U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152633A (en) * | 2017-12-27 | 2018-06-12 | 北京安航达科技有限公司 | Non-specific devices Working state analysis control method based on current drain waveform |
| CN108767810A (en) * | 2018-08-31 | 2018-11-06 | 重庆惠科金渝光电科技有限公司 | A kind of current-limiting circuit and current-limiting apparatus |
| WO2020042309A1 (en) * | 2018-08-31 | 2020-03-05 | 重庆惠科金渝光电科技有限公司 | Current limiting circuit, current limiting device, and display device |
| US11018500B2 (en) | 2018-08-31 | 2021-05-25 | Chongqing Hkc Optoelectronics Technology Co., Ltd. | Current-limiting circuit, current-limiting device and display device |
| CN109659900A (en) * | 2018-12-25 | 2019-04-19 | 江苏威尔曼科技有限公司 | A kind of protection circuit for motor servo driver |
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