CN107370117B - A kind of output overcurrent and short-circuit protection circuit and a kind of electronic equipment - Google Patents
A kind of output overcurrent and short-circuit protection circuit and a kind of electronic equipment Download PDFInfo
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- CN107370117B CN107370117B CN201710560217.1A CN201710560217A CN107370117B CN 107370117 B CN107370117 B CN 107370117B CN 201710560217 A CN201710560217 A CN 201710560217A CN 107370117 B CN107370117 B CN 107370117B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Abstract
The present invention provides a kind of output overcurrent and short-circuit protection circuit; including driving circuit, metal-oxide-semiconductor and protection circuit; the protection circuit includes the first triode and sampling resistor; the grid of the driving circuit connection metal-oxide-semiconductor; the drain electrode of metal-oxide-semiconductor is for connecting load; the source electrode of metal-oxide-semiconductor is for connecting power supply; driving circuit is used to connect the I/O interface of controller; the source electrode of the emitter connection metal-oxide-semiconductor of first triode; the drain electrode of the base stage, sampling resistor and metal-oxide-semiconductor of first triode is sequentially connected, and the collector of the first triode connects driving circuit.Using metal-oxide-semiconductor as electronic switch, triode and sampling resistor composition protection circuit, the source electrode and drain electrode of metal-oxide-semiconductor directly with the protection circuit in parallel, have the advantages that at low cost, reaction speed fastly, it is high reliablity, low in energy consumption.The invention further relates to a kind of electronic equipment, including load and the output overcurrent and short-circuit protection circuit, load is connect with the output overcurrent and short-circuit protection circuit.
Description
Technical field
The present invention relates to circuit protection technical field more particularly to a kind of output overcurrents and short-circuit protection circuit and a kind of electricity
Sub- equipment.
Background technique
In some security protection control systems, it may require that sometimes and connect some external equipments, such as smoke sensor device, meteorological sensing
Device, temperature sensor, combined aural and visual alarm, video camera etc..It must be related to the powerup issue of peripheral hardware in this way, and be that multichannel supplies
Electricity.Such peripheral hardware power supply is usually to provide multiple power supply interfaces by system controller to be exposed to outside, passes through plug cable by user
Etc. modes voluntarily connect these peripheral hardwares.If some peripheral hardware breaks down or user accidentally supplies power supply when connecing peripheral hardware
Electricity output is shorted, again without overcurrent and short-circuit protection circuit in controller, it is more likely that will lead to controller damage.It is such to prevent
Failure improves the quality and stability of product, must take the safeguard measure of some overcurrents and short circuit.
In existing overcurrent and short-circuit protection technology, as shown in Figure 1, the power supply of peripheral hardware load generally uses multichannel relay
Device/metal-oxide-semiconductor 2 ' connects power supply 1 ' as power switch, and examines leakage resistance 3 ' and amplifying circuit between 4 ' on string exporting and loading
6'.When overcurrent occurs in output loop, control circuit 5 ' controls relay/metal-oxide-semiconductor 2 ' and acts, cut off the power 1 ' with load 4 ' it
Between connection, thus achieve the purpose that protection power source 1 ' and load 4 '.
However it is had the disadvantage in that by the way of relay+series resistance sample circuit
1, at high cost.Due to having used relay and amplifier circuit, cost will necessarily get on.
2, the protection reaction time is slow.Relay is mechanical switch, samples its movement closing of control from inspection stream, this time is extremely
A few tens of milliseconds is needed less, and the reaction time is too long, and the so long reaction time may cause controller power source and peripheral hardware
Damage.
3, the service life is short.Relay is in load-carrying situation, and the service life switched repeatedly only has tens of thousands of times or so, for requiring
3 years, 5 years even for the equipment of longer time no-failure operation, are a serious problems.
4, power consumption is high.Relay needs certain holding electric current when being closed, and will increase power consumption；In addition concatenated sampling electricity
Resistance, electric current can all be flowed through from sampling resistor, also will increase the additional power consumption of system.
5, it controls not flexible.Foregoing circuit controls output switch using self-locking self-healing form is protected, without I/O port, uses
Family can not voluntarily be closed.
And by the way of metal-oxide-semiconductor+series resistance sample circuit, it is similar to have the disadvantage in that
1, power consumption is high.It is also series connection sampling resistor, will increase system extra power consumption.
2, it controls not flexible.Reason is with described in above-mentioned 5th point.
Therefore, it is necessary to propose that one kind can carry out overcurrent and short-circuit protection to output, and it is able to solve the above problem
Scheme.
Summary of the invention
The technical problems to be solved by the present invention are: providing, one kind is at low cost, reaction is fast, the service life is long, low in energy consumption, control spirit
Output overcurrent and short-circuit protection circuit living.The electronic equipment of a kind of power supply safety, high reliablity is also provided.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of output overcurrent and short-circuit protection circuit, including driving circuit, metal-oxide-semiconductor and protection circuit, the protection circuit
Including the first triode and sampling resistor, the grid of the driving circuit connection metal-oxide-semiconductor, the drain electrode of metal-oxide-semiconductor is loaded for connecting,
The source electrode of metal-oxide-semiconductor is used to connect the I/O interface of controller, the emitter connection of the first triode for connecting power supply, driving circuit
The drain electrode of the source electrode of metal-oxide-semiconductor, the base stage, sampling resistor and metal-oxide-semiconductor of the first triode is sequentially connected, the collector of the first triode
Connect driving circuit.
Another technical solution of the invention are as follows:
A kind of electronic equipment, including load and above-mentioned output overcurrent and short-circuit protection circuit, it is described load with it is described
Output overcurrent and short-circuit protection circuit connection.
The beneficial effects of the present invention are:
(1) output overcurrent and short-circuit protection circuit of the invention, using metal-oxide-semiconductor as electronic switch, using triode and
Sampling resistor composition protection circuit, cost are very low；Work as external equipment, i.e., when short circuit or overcurrent occur for above-mentioned load, protection
Circuit can be exported in 1 millisecond of internal cutting off, protect circuit, have the advantages that reaction speed is fast；And the present invention is all using crystalline substance
Body pipe, the mechanical devices of non-relay etc, protection act device there is a phenomenon where after will not generate aging, circuit life
It is long, high reliablity；And major loop is exported without sampling resistor of connecting, the excess loss of entire circuit is only in metal-oxide-semiconductor itself
It is low in energy consumption in internal resistance, suitable for the electronic equipment high to power consumption requirements.
(2) electronic equipment of the invention has the function of overcurrent and short-circuit protection, power supply safety, high reliablity, reaction speed
Degree is fast, and power consumption is very low.
Detailed description of the invention
Fig. 1 is the structure connection diagram of existing overcurrent and short-circuit protection technology；
Fig. 2 is the output overcurrent of the embodiment of the present invention and the structure connection diagram of short-circuit protection circuit；
Fig. 3 is the output overcurrent of the embodiment of the present invention one and the circuit diagram of short-circuit protection circuit.
Label declaration:
1 ', power supply；2 ', relay/metal-oxide-semiconductor；3 ', leakage resistance is examined；4 ', it loads；5 ', control circuit；6 ', amplifying circuit；
1, driving circuit；11, IO driving unit；12, pulse driver unit；2, metal-oxide-semiconductor；3, circuit is protected；4, it loads.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached
Figure is explained.
The most critical design of the present invention is: the first triode and sampling resistor composition protection circuit, protect circuit and MOS
Pipe is in parallel.
Referring to figure 2., the present invention provides:
A kind of output overcurrent and short-circuit protection circuit, including driving circuit 1, metal-oxide-semiconductor 2 and protection circuit 3, the protection are electric
Road 3 includes the first triode and sampling resistor, and the driving circuit 1 connects the grid of metal-oxide-semiconductor 2, and the drain electrode of metal-oxide-semiconductor 2 is for connecting
Load 4 is connect, the source electrode of metal-oxide-semiconductor 2 is used to connect the I/O interface of controller for connecting power supply, driving circuit 1, the first triode
Emitter connects the source electrode of metal-oxide-semiconductor 2, and the drain electrode of the base stage, sampling resistor and metal-oxide-semiconductor 2 of the first triode is sequentially connected, and the one or three
The collector of pole pipe connects driving circuit 1.
As can be seen from the above description, the beneficial effects of the present invention are: using metal-oxide-semiconductor be used as electronic switch, triode with adopt
Sample resistance composition protection circuit, the source electrode and drain electrode of metal-oxide-semiconductor directly with the protection circuit in parallel, have at low cost, reaction speed
Fastly, high reliablity, advantage low in energy consumption.
Further, the driving circuit 1 includes IO driving unit 11 and pulse driver unit 12, and IO driving unit 11 wraps
Include: first resistor, second resistance, 3rd resistor and the second triode, pulse driver unit 12 include: the 4th resistance, the 5th electricity
Resistance, the 6th resistance, the 7th resistance, the 8th resistance, capacitor, third transistor and the 4th triode；One end of first resistor connects
The I/O interface of controller, the other end of first resistor connect the base stage of the second triode；Second resistance is connected to the second triode
Between base stage and emitter；The collector of one end connection third transistor of 3rd resistor, the other end of 3rd resistor connect electricity
Source；One end of 4th resistance connects the collector of the second triode, the base stage of the other end connection third transistor of the 4th resistance；
One end of 5th resistance connects power supply, the collector of the other end connection third transistor of the 5th resistance；The collection of third transistor
Electrode, capacitor, the 6th resistance, the 4th triode base stage be sequentially connected；The hair of one end connection third transistor of 7th resistance
Emitter-base bandgap grading, the other end of the 7th resistance connect the base stage of the 4th triode；One end of 8th resistance connects the current collection of the 4th triode
Pole, the grid of the other end connection metal-oxide-semiconductor of the 8th resistance；The collector of first triode connects the collector of the 4th triode.
As can be seen from the above description, the I/O interface level due to controllers such as embeded processor or single-chip microcontrollers is generally
3.3V is hereinafter, therefore IO driving power is using first resistor, second resistance and the second triode composition reverse driving circuit, by IO
Interface level is converted into the driving signal needed.When the level of I/O interface drags down, metal-oxide-semiconductor can be remained turned-off；When I/O interface
Level by it is low draw to it is high when, will lead to the pulse voltage that pulse driver unit generates a several hundred microseconds not grade, metal-oxide-semiconductor moment leads
Logical, IO level needs to be always maintained at high level during metal-oxide-semiconductor is connected；And the state that can be held on after metal-oxide-semiconductor conducting, therefore not
It needs to add pulse voltage again.And the protection circuit of the first triode and sampling resistor composition is directly in parallel with metal-oxide-semiconductor, makes to export
The electric current of major loop will not be flowed through from sampling resistor, thus greatly reduce extra power consumption.When protection circuit detects switch
When pipe overcurrent or short circuit, drive level is generated at once, cooperates with pulse driver unit and closes switching tube, and cutting voltage is defeated
Out, to achieve the purpose that protection.Above-mentioned metal-oxide-semiconductor specifically uses the P-channel metal-oxide-semiconductor of high-power, low internal resistance.
Further, the pulse width of the base stage input of the 4th triode is 300us-1000us.
As can be seen from the above description, load output short-circuit in order to prevent or when overcurrent due to crossing cause thermal damage metal-oxide-semiconductor, driving the
The pulse width of four triode ONs need to design between 300us-1000us, specifically, main by adjusting capacitor, the 5th electricity
It hinders with the size of the 6th resistance and realizes the adjusting of pulse width.
Further, the protection circuit 3 further includes the 9th resistance, the 5th triode and the tenth resistance, the 9th electricity
One end of resistance connects the collector of the second triode, and the other end of the 9th resistance connects the base stage of the 5th triode, the tenth resistance
One end connect the collector of the 5th triode, the other end of the tenth resistance connects the base stage of the first triode.
As can be seen from the above description, the I/O interface of controller is by protecting circuit that can freely control, to open or close power supply defeated
Out, and after electrical equipment breaks down and generates protection act can self-locking closing output, prevent from further damaging, when failure is arranged
Except when again enable I/O interface just can restore to export.
Further, the protection circuit 3 further includes eleventh resistor, twelfth resistor and thirteenth resistor, and the 12nd
Resistance is connected between the collector of the first triode and the collector of the 4th triode, and eleventh resistor and twelfth resistor connect
It connects, thirteenth resistor is connect with sampling resistor.
Further, the transmitting of the emitter, the emitter, the 4th triode of third transistor of second triode
Pole, the 5th triode emitter, eleventh resistor and thirteenth resistor be grounded respectively.
Another technical solution of the invention are as follows:
A kind of electronic equipment, including load and above-mentioned output overcurrent and short-circuit protection circuit, it is described load with it is described
Output overcurrent and short-circuit protection circuit connection.
Referring to figure 3., the embodiment of the present invention one are as follows:
A kind of output overcurrent and short-circuit protection circuit, including driving circuit 1, metal-oxide-semiconductor T and protection circuit 3.The driving electricity
Road 1 includes IO driving unit 11 and pulse driver unit 12, and IO driving unit 11 includes: first resistor R1, second resistance R2, the
Three resistance R3 and the second triode Q2, pulse driver unit 12 include: the 4th resistance R4, the 5th resistance R5, the 6th resistance R6,
Seven resistance R7, the 8th resistance R8, capacitor C1, third transistor Q3 and the 4th triode Q4.The protection circuit 3 includes the 9th electricity
Hinder R9, the 5th triode Q5, the tenth resistance R10, the first triode Q1, sampling resistor R, eleventh resistor R11, twelfth resistor
R12 and thirteenth resistor R13.
The drain electrode of the metal-oxide-semiconductor T is for connecting load 4, and the source electrode of metal-oxide-semiconductor T is for connecting power supply, the output of the power supply
Vin i.e. shown in Fig. 3.
The I/O interface of one end connection controller of the first resistor R1, the other end of first resistor R1 connect the two or three pole
The base stage of pipe Q2；Second resistance R2 is connected between the base stage and emitter of the second triode Q2；One end of 3rd resistor R3 connects
The other end of the collector of third transistor Q3,3rd resistor R3 connects power supply；One end of 4th resistance R4 connects the two or three pole
The collector of pipe Q2, the base stage of the other end connection third transistor Q3 of the 4th resistance R4；One end of 5th resistance R5 connects electricity
Source, the collector of the other end connection third transistor Q3 of the 5th resistance R5；Collector, the capacitor C1, of third transistor Q3
Six resistance R6, the 4th triode Q4 base stage be sequentially connected；The emitter of one end connection third transistor Q3 of 7th resistance R7,
The other end of 7th resistance R7 connects the base stage of the 4th triode Q4；One end of 8th resistance R8 connects the collection of the 4th triode Q4
Electrode, the grid of the other end connection metal-oxide-semiconductor T of the 8th resistance R8.4th triode base stage input pulse width be
300us-1000us。
The source electrode of the emitter connection metal-oxide-semiconductor T of the first triode Q1, the base stage of the first triode Q1, sampling resistor R
Drain electrode with metal-oxide-semiconductor T is sequentially connected, the current collection of the collector of the first triode Q1, twelfth resistor R12 and the 4th triode Q4
Pole is sequentially connected, and eleventh resistor R11 is connect with twelfth resistor R12, and thirteenth resistor R13 is connect with sampling resistor R.
One end of the 9th resistance R9 connects the collector of the second triode Q2, the other end connection of the 9th resistance R9 the
The base stage of five triode Q5, one end of the tenth resistance R10 connect the collector of the 5th triode Q5, and the tenth resistance R10's is another
The base stage of the first triode Q1 of end connection.The emitter of the second triode Q2, the emitter of third transistor Q3, the four or three
The emitter of pole pipe Q4, the emitter of the 5th triode Q5, eleventh resistor R11 and thirteenth resistor R13 are grounded respectively.Such as
Shown in Fig. 3.
The output overcurrent of the present embodiment and the composition of short-circuit protection circuit and principle are as follows:
1, IO driving unit: since the I/O interface level of embeded processor or single-chip microcontroller is generally 3.3V hereinafter, originally
Unit constitutes reverse phase driving circuit by using R1, R2 and Q2, is driving signal required for entire circuit by IO level conversion；
2, pulse driver unit: when the level of I/O interface by it is low -> high when, the level on R4 can make Q3 by high -> low jump
Cut-off, R5 become Vin pull-up from pulling down, and level, which generates jump, to drive Q4 conducting by the coupling of C1 generation pulse t, drag down T
Grid, and then T is connected, exports Vout.
Wherein, pulsewidth t evaluation method is as follows:
Vt0=(Vin-0.7) * R6*(R5+R6)+0.7,
In above formula, Vt0The charging voltage size carved at the beginning for C1；0.7 is the PN junction conduction threshold of Q3；VtIt is filled for C1
Voltage value after full electricity, generally takes 0.9*Vin.
Metal-oxide-semiconductor is damaged due to overheat when loading output short-circuit or overcurrent in order to prevent, the value of pulsewidth t needs to design
It is main by adjusting C between 300us-1000us1、R5And R6Size can achieve.
3, protect circuit: after T conducting, the base voltage and emitter voltage of Q1 is of substantially equal, and Q1 cut-off, T is in R11 at this time
Drop-down effect under be held on；When T cut-off, the base voltage of Q1 is about 0V, and Q1 is connected, and the grid of T is pulled upward to by R12
Vin (value of R11 must be much larger than R12), T keep cut-off；The effect of Q5 is when IO control level is low, and Q2 control Q5 is led
Logical, pressure drags down the base stage of Q1, and Q1 is connected, to close T, plays the role of switch.
It is not difficult to find out that the output and closing of T can control by the conducting and cut-off that control Q1, and whether the conducting of Q1
By its PN junction bias voltage VEB1(PNP silicone tube, take 0.7V) determines: working as VEB1When > 0.7V, Q1 conducting, T cut-off；Work as VEB1<0.7V
When, Q1 cut-off, T conducting.Using this characteristic, the current protection threshold value of circuit output can be set:
If RTFor the conducting internal resistance (this value can be found on the handbook of T) of T, Iout is maximum output current, then works as electricity
When road works normally, Q1 and Q5 ends simultaneously, has:
That is:
Use above-mentioned formula, the size of adjustment the inside resistance, i.e., the maximum output protective current Iout of settable device.
The output overcurrent of the present embodiment and the operational process of short-circuit protection circuit are as follows:
1, powered on moment, since the drop-down of R2 acts on, Q2 cut-off, Q3 is held on, and the level between R5 and C1 is 0；Q4 exists
It pulls down and is also switched off under R7；And Q5 obtains the pull-up biasing of R3 and is connected, Q1 is connected in the base stage for dragging down Q1, to draw high T's
Grid ends T, and Vout is without output at this time.
2, when system drive I/O interface, when being set high, Q2 is connected, at this time successive Drive Protecting Circuit and driving circuit.
(1) for protecting circuit, since the base stage of Q5 is pulled low, Q5 cut-off, the base stage state of Q1 is by R and R13 or more
It draws and determines；
(2) for driving circuit, since R4 is pulled low, Q3 cut-off, for the level of R5 by getting higher rapidly over the ground, level mutation is logical
The coupling of C1 is crossed, generates driving pulse t driving Q4 conducting, the grid of T is pulled down to ground, T conducting at this time；
(3) after T is connected, the base stage of Q1 is drawn high by R, and Q1 cut-off, the grid of T is only pulled down by R11 and controlled, and T can be led always
Logical, Vout normal output voltage is to load.
3, when output loading circuit overcurrent or short circuit when, since electric current is excessive, T internal resistance effect under, the source electrode of T and
The voltage at drain electrode both ends increases rapidly, and Vout is reduced rapidly, and leads to the emitter and base voltage V of Q1EB1It increases rapidly, when
VEB1Q1 can be made to be connected when >=0.7V, to draw high the grid of T, end T, turn off voltage output.To play a protective role.
After troubleshooting, I/O interface is enabled again, and circuit can export Vout again, repeat the process of above-mentioned 1-3.
The embodiment of the present invention two are as follows:
A kind of electronic equipment, it is described negative including output overcurrent and short-circuit protection circuit described in load and embodiment one
Load is connect with the output overcurrent and short-circuit protection circuit.
In conclusion a kind of output overcurrent provided by the invention and short-circuit protection circuit and a kind of electronic equipment, have at
This is low, reaction speed is fast, control flexibly, service life length, high reliablity, it is low in energy consumption the advantages that.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include
In scope of patent protection of the invention.
Claims (6)
1. a kind of output overcurrent and short-circuit protection circuit, which is characterized in that described including driving circuit, metal-oxide-semiconductor and protection circuit
Protecting circuit includes the first triode and sampling resistor, and the driving circuit connects the grid of metal-oxide-semiconductor, and the drain electrode of metal-oxide-semiconductor is used for
Connection load, the source electrode of metal-oxide-semiconductor are used to connect the I/O interface of controller for connecting power supply, driving circuit, the first triode
Emitter connects the source electrode of metal-oxide-semiconductor, and the drain electrode of the base stage, sampling resistor and metal-oxide-semiconductor of the first triode is sequentially connected, the one or three pole
The collector of pipe connects driving circuit；
Wherein, the driving circuit includes IO driving unit and pulse driver unit, and IO driving unit includes: first resistor,
Two resistance, 3rd resistor and the second triode, pulse driver unit include: the 4th resistance, the 5th resistance, the 6th resistance, the 7th
Resistance, the 8th resistance, capacitor, third transistor and the 4th triode；The I/O interface of one end connection controller of first resistor, the
The other end of one resistance connects the base stage of the second triode；Second resistance is connected between the base stage and emitter of the second triode；
One end of 3rd resistor connects the collector of the second triode, and the other end of 3rd resistor connects power supply；One end of 4th resistance
Connect the collector of the second triode, the base stage of the other end connection third transistor of the 4th resistance；One end of 5th resistance connects
Connect power supply, the collector of the other end connection third transistor of the 5th resistance；Collector, capacitor, the 6th electricity of third transistor
It hinders, the base stage of the 4th triode is sequentially connected；7th resistance one end connection third transistor emitter, the 7th resistance it is another
One end connects the base stage of the 4th triode；One end of 8th resistance connects the collector of the 4th triode, the 8th resistance it is another
The grid of end connection metal-oxide-semiconductor；The collector of first triode connects the collector of the 4th triode.
2. output overcurrent according to claim 1 and short-circuit protection circuit, which is characterized in that the base stage of the 4th triode is defeated
The pulse width entered is 300us-1000us.
3. output overcurrent according to claim 1 and short-circuit protection circuit, which is characterized in that the protection circuit further includes
9th resistance, the 5th triode and the tenth resistance, one end of the 9th resistance connect the collector of the second triode, the 9th electricity
The other end of resistance connects the base stage of the 5th triode, and one end of the tenth resistance connects the collector of the 5th triode, the tenth resistance
The other end connect the first triode base stage.
4. output overcurrent according to claim 3 and short-circuit protection circuit, which is characterized in that the protection circuit further includes
Eleventh resistor, twelfth resistor and thirteenth resistor, twelfth resistor are connected to collector and the four or three pole of the first triode
Between the collector of pipe, eleventh resistor is connect with twelfth resistor, and thirteenth resistor is connect with sampling resistor.
5. output overcurrent according to claim 4 and short-circuit protection circuit, which is characterized in that the hair of second triode
Emitter-base bandgap grading, the emitter of third transistor, the emitter of the 4th triode, the emitter of the 5th triode, eleventh resistor and
Thirteenth resistor is grounded respectively.
6. a kind of electronic equipment, which is characterized in that including load and claim 1-5 any one described in output overcurrent and
Short-circuit protection circuit, the load are connect with the output overcurrent and short-circuit protection circuit.
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| CN201710560217.1A CN107370117B (en) | 2017-07-11 | 2017-07-11 | A kind of output overcurrent and short-circuit protection circuit and a kind of electronic equipment |
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| CN201710560217.1A CN107370117B (en) | 2017-07-11 | 2017-07-11 | A kind of output overcurrent and short-circuit protection circuit and a kind of electronic equipment |
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| CN107370117B true CN107370117B (en) | 2019-04-30 |
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| CN107919649B (en) * | 2017-12-28 | 2023-05-05 | 东风商用车有限公司 | Diagnosis and protection system of controller on-board relay and use method thereof |
| CN108631279B (en) * | 2018-06-28 | 2024-01-23 | 深圳市高新投三江电子股份有限公司 | Overcurrent protection circuit |
| CN111836434B (en) * | 2020-06-24 | 2023-04-28 | 武汉光庭科技有限公司 | Light control circuit of electric two-wheel vehicle |
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| FR2927479B1 (en) * | 2008-02-08 | 2012-05-04 | Schneider Electric Ind Sas | SYSTEM FOR CONTROLLING AND PROTECTING A NEGATIVE LOGIC OUTPUT OF AN AUTOMATION EQUIPMENT. |
| CN102231511A (en) * | 2011-04-11 | 2011-11-02 | 深圳桑达国际电子器件有限公司 | LED drive circuit and short-circuit protection circuit thereof |
| CN103904631A (en) * | 2012-12-31 | 2014-07-02 | 海洋王（东莞）照明科技有限公司 | Protection circuit |
| US9658276B2 (en) * | 2014-06-23 | 2017-05-23 | Microchip Technology Inc. | Circuit and method for detecting short circuit failure of a switching transistor |
| CN205791490U (en) * | 2016-06-20 | 2016-12-07 | 浙江科博达工业有限公司 | Switching tube current-limiting protection circuit |
| CN106787659A (en) * | 2017-01-05 | 2017-05-31 | 科蒂斯技术（苏州）有限公司 | The short-circuit protection circuit that a kind of use P MOS are exported as high-side driver |
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