CN209571817U - IC chip protects circuit - Google Patents
IC chip protects circuit Download PDFInfo
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- CN209571817U CN209571817U CN201920664950.2U CN201920664950U CN209571817U CN 209571817 U CN209571817 U CN 209571817U CN 201920664950 U CN201920664950 U CN 201920664950U CN 209571817 U CN209571817 U CN 209571817U
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Abstract
The utility model provides a kind of IC chip protection circuit, and IC chip protection circuit includes: sampling comparison circuit, control circuit, switching circuit and IC chip feed circuit；Sampling comparison circuit is compared for connecting load end to acquire the voltage value of load end using voltage value and default pressure stabilizing value, determines whether load end is in under-voltage or short-circuit condition；Control circuit connection sampling comparison circuit is sent to switching circuit for generating pressure limiting instruction when load end is in under-voltage or short-circuit condition；Switching circuit connects IC chip feed circuit, for after receiving pressure limiting instruction, limitation load end to be transmitted to the voltage of IC chip feed circuit；IC chip feed circuit connects load end, for the output signal of load end to be fed back to IC chip.The IC chip of the utility model protects circuit, when loading under-voltage or short-circuit, can reduce the voltage that load end is transmitted to the feedback signal of IC chip, avoid IC chip voltage excessive and cause to damage.
Description
Technical field
The utility model relates to field of switch power, protect circuit in particular to a kind of IC chip.
Background technique
It is existing in voltage increase and current constant circuit, generally use IC chip (IC, Integrated Circuit, integrated circuit)
Control the output of load end, include a large amount of microelectronic component in the IC chip, for example including have transistor, resistance with
And capacitor etc..
When carrying out the control of load end using IC chip, which also needs to obtain the output signal of load end as anti-
Feedback.And in the state that load end is under-voltage or short circuit, the electric current of load end output can increase moment, to make to feed back to IC chip
Signal voltage increase, lead to the damage of IC chip.
In the prior art, lack a kind of circuit that IC chip is protected in load end feedback procedure.
Utility model content
In view of the above problems, the utility model provides a kind of IC chip protection circuit, with when loading under-voltage or short-circuit,
The voltage that load end is transmitted to the feedback signal of IC chip can be reduced, avoids IC chip voltage excessive and causes to damage.
To achieve the goals above, the utility model adopts the following technical solutions:
A kind of IC chip protection circuit, including sampling comparison circuit, control circuit, switching circuit and IC chip feedback electricity
Road；
The sampling comparison circuit acquires the voltage value of the load end for connecting load end, and utilizes the voltage
Value is compared with default pressure stabilizing value, determines whether the load end is in under-voltage or short-circuit condition；
The control circuit connects the sampling comparison circuit, for when the load end is in under-voltage or short-circuit condition
It generates pressure limiting instruction and is sent to the switching circuit；
The switching circuit connects the IC chip feed circuit, is used for after receiving the pressure limiting instruction, described in limitation
Load end is transmitted to the voltage of the IC chip feed circuit；
The IC chip feed circuit connects the load end, for the output signal of the load end to be fed back to IC core
Piece.
Preferably, in IC chip protection circuit, the sampling comparison circuit includes first resistor, the second electricity
Resistance, voltage-stabiliser tube and the first triode；
Described first resistor one end connects the anode of the load end, and the other end connects the voltage-stabiliser tube, for that will acquire
The voltage value of load end be transmitted to the voltage-stabiliser tube；
The voltage-stabiliser tube connects the emitter of first triode, for being greater than the voltage-stabiliser tube in the voltage value
When pressure stabilizing value, the voltage-stabiliser tube is connected and first triode is connected；
The base stage of first triode connects the second resistance, and the other end of the second resistance connects the load
The cathode at end；
The collector of first triode connects the control circuit, for exporting in first triode ON
Driving voltage is to the control circuit.
Preferably, in the described IC chip protection circuit, the control circuit include the second triode, third transistor with
And driving power；
The base stage of second triode connects the collector of first triode, the collector of second triode
For connecting the driving power, the emitter ground connection of second triode；
The base stage of the third transistor connects the collector of second triode, the collector of the third transistor
Connect the driving power and the switching circuit, the emitter ground connection of the third transistor.
Preferably, in IC chip protection circuit, the base stage of second triode and first triode
3rd resistor is connected between collector；The 4th electricity is connected between the collector and the driving power of second triode
Resistance；The 5th resistance is connected between the base stage of the third transistor and the collector of second triode；Described 3rd 3
The 6th resistance is connected between the collector of pole pipe and the driving power.
Preferably, in IC chip protection circuit, the switching circuit includes metal-oxide-semiconductor and the 7th resistance；
The grid of the metal-oxide-semiconductor is used to connect the collector of the driving power and the third transistor；
The source electrode of the metal-oxide-semiconductor is for connecting the IC chip feed circuit；
The drain of the metal-oxide-semiconductor is used to connect the cathode of the load end, and connects the IC by the 7th resistance
Chip feed circuit.
Preferably, in the described IC chip protection circuit, the IC chip feed circuit includes IC chip feedback pin, the
Eight resistance and diode；
The IC chip feedback pin connects the source electrode of the metal-oxide-semiconductor, and connects the load end by the 7th resistance
Cathode；
Described 8th resistance one end connects the IC chip feedback pin, other end ground connection；
The anode of the diode connects the IC chip feedback pin, cathode ground connection.
Preferably, in IC chip protection circuit, the resistance value of the 7th resistance is greater than 10 kilohms.
Preferably, in IC chip protection circuit, when the load end is under-voltage or short-circuit, the voltage-stabiliser tube, institute
It states the first triode and second triode is not turned on, the base stage of the third transistor receives the driving power transmission
Electric energy after be connected, and collector export low level to the metal-oxide-semiconductor grid；The grid of the metal-oxide-semiconductor receives described low
It is not turned on after level, the output signal of the cathode of the load end is by being transmitted to the IC chip after the 7th electric resistance partial pressure
Feedback pin.
Preferably, in the described IC chip protection circuit, the control circuit include IC1 amplifier chip, driving power with
And reference voltage；
First pin of the IC1 amplifier chip connects the switching circuit；
The second pin of the IC1 amplifier chip connects the reference voltage；
The third pin of the IC1 amplifier chip connects the sampling comparison circuit, and passes through resistance eutral grounding；
4th pin of the IC1 amplifier chip is grounded；
8th pin of the IC1 amplifier chip connects the driving power.
Preferably, in IC chip protection circuit, the load end includes LED light.
The utility model provides a kind of IC chip protection circuit, and it includes sampling comparison circuit, control which, which protects circuit,
Circuit, switching circuit and IC chip feed circuit processed；The sampling comparison circuit acquires described negative for connecting load end
The voltage value at end is carried, and is compared using the voltage value and default pressure stabilizing value, determines whether the load end is in under-voltage
Or short-circuit condition；The control circuit connects the sampling comparison circuit, for being in under-voltage or short-circuit shape in the load end
Pressure limiting instruction is generated when state is sent to the switching circuit；The switching circuit connects the IC chip feed circuit, is used for
After receiving the pressure limiting instruction, the voltage that the load end is transmitted to the IC chip feed circuit is limited；The IC chip is anti-
Current feed circuit connects the load end, for the output signal of the load end to be fed back to IC chip.The IC core of the utility model
Piece protects circuit, when loading under-voltage or short-circuit, can reduce the voltage that load end is transmitted to the feedback signal of IC chip, avoid
IC chip voltage is excessive and causes to damage.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to attached drawing needed in the embodiment in order to illustrate more clearly of the technical solution of the utility model
It is briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore is not construed as
Restriction to scope of protection of the utility model.In various figures, part is similarly comprised using similar number.
Fig. 1 is a kind of structural schematic diagram for IC chip protection circuit that the utility model embodiment 1 provides；
Fig. 2 is a kind of circuit diagram for IC chip protection circuit that the utility model embodiment 2 provides；
Fig. 3 is a kind of circuit diagram for IC chip protection circuit that the utility model embodiment 3 provides.
Specific embodiment
Below in conjunction with attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole realities
Apply example.
The component of the utility model embodiment being usually described and illustrated herein in the accompanying drawings can be matched with a variety of different
It sets to arrange and design.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to below
The range of claimed invention is limited, but is merely representative of the selected embodiment of the utility model.It is practical based on this
Novel embodiment, those skilled in the art's every other implementation obtained without making creative work
Example, fall within the protection scope of the utility model.
It hereinafter, can the term " includes " used in the various embodiments of the utility model, " having " and its homologous
Word is meant only to indicate special characteristic, number, step, operation, the combination of element, component or aforementioned item, and is understood not to
The combined presence or increasing of one or more other features, number, step, operation, element, component or aforementioned item is excluded first
A possibility that adding the combination of one or more features, number, step, operation, element, component or aforementioned item.
In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, it is not understood to indicate or imply
Relative importance.
Unless otherwise defined, otherwise all terms (including technical terms and scientific terms) used herein have and this
The identical meaning of the various normally understood meanings of embodiment one skilled in the art of utility model.The term is (all
Such as the term limited in the dictionary used) it is to be interpreted as with identical as situational meaning in the related technical field
Meaning and Utopian meaning or meaning too formal will be interpreted as having, unless in the various of the utility model
It is clearly defined in embodiment.
Embodiment 1
Fig. 1 is a kind of structural schematic diagram for IC chip protection circuit that the utility model embodiment 1 provides.
It includes sampling comparison circuit 110, control circuit 120, switching circuit 130 and IC that the IC chip, which protects circuit 100,
Chip feed circuit 140；
The sampling comparison circuit 110 acquires the voltage value of the load end 150, and benefit for connecting load end 150
It is compared with the voltage value and default pressure stabilizing value, determines whether the load end 150 is in under-voltage or short-circuit condition；
In the utility model embodiment, which is generally used in booster circuit, issues pulsewidth tune using IC chip
Signal processed plays the role of limiting power in booster circuit, when carrying out the adjustment of output voltage using IC chip, needs to detect
The electric current of load, and it is converted into the feedback pin of Voltage Feedback to IC chip, it can just accomplish to precisely limit power.General
In booster circuit, the feedback pin of the IC chip is the cathode that load end 150 is connected to by resistance and diode, to obtain
The feedback signal of load end 150, load short circuits or it is under-voltage when, which may transmit high voltage into IC chip,
Lead to the damage of IC chip.
It is main to protect circuit 100 to limit load end 150 under-voltage or short-circuit by IC chip in the utility model embodiment
In the case of feedback signal voltage, to protect IC chip.Wherein IC chip protection circuit 100 can be applied to various uses
In the product facility of IC chip, here without limitation.Wherein, above-mentioned load end 150 includes LED light.The IC chip protects circuit
100 sampling comparison circuit 110, can connect the positive and negative both ends of LED light, and acquire the voltage at the positive and negative both ends of LED light, that is, be negative
The voltage value for carrying end 150, recycles the voltage value to be compared with pressure stabilizing value, judges the output state in which of load end 150.
Wherein, when which is greater than pressure stabilizing value, the output of load end 150 is in normal state, when voltage value is less than pressure stabilizing value,
The output of load end 150 is in under-voltage state, and when voltage value is zero, then the output of load end 150 is in the state of short circuit.
The control circuit 120 connects the sampling comparison circuit 110, for the load end 150 be in it is under-voltage or
Pressure limiting instruction is generated when short-circuit condition is sent to the switching circuit 130；
In the utility model embodiment, it includes control circuit 120, the control circuit which, which protects in circuit 100,
120 connection sampling comparison circuits 110, and the output state for the load end 150 that sampling comparison circuit 110 determines is obtained, and generate
Corresponding instruction is sent to switching circuit 130.Wherein, this it is corresponding instruction include pressure limiting instruction, namely load end 150 just
Often in the case where output, which can not generate any instruction, the switching circuit 130 and IC chip feedback electricity
Road 140 works normally, and the IC chip feed circuit 140 is allow directly to obtain the feedback letter of output from the cathode of load end 150
Number, and by feedback signal transmission into IC chip.And in the case where load end 150 exports under-voltage or short circuit, it generates pressure limiting and refers to
Order is sent in switching circuit 130, and the cathode for making switching circuit 130 limit load end 150 is transmitted to IC chip feed circuit 140
Feedback signal voltage.
The switching circuit 130 connects the IC chip feed circuit 140, for limiting after receiving the pressure limiting instruction
Make the voltage that the load end 150 is transmitted to the IC chip feed circuit 140；
In the utility model embodiment, the very big resistance of resistance value is provided in the switching circuit 130, such as can be set
There is resistance value to be greater than 10 kilohms of resistance, load end 150 output short-circuit or it is under-voltage when be used to and IC chip feedback electricity
Road 140 is divided, so that the cathode for limiting load end 150 is transmitted to the voltage of IC chip feed circuit 140.
The IC chip feed circuit 140 connects the load end 150, for by the output signal of the load end 150
Feed back to IC chip.
In the utility model embodiment, which is used to obtain the output signal of load end 150, and
It feeds back in IC chip, so that the booster circuit of IC chip control load carries out the modulation of load voltage.The IC chip is provided with
Feedback pin is connect by feedback pin with IC chip feed circuit 140, and feedback signal is obtained.Wherein, above-mentioned load end includes
LED light.
Embodiment 2
Fig. 2 is a kind of circuit diagram for IC chip protection circuit that the utility model embodiment 2 provides.
It includes sampling comparison circuit 210, control circuit 220, switching circuit 230 and IC that the IC chip, which protects circuit 200,
Chip feed circuit 240；
The sampling comparison circuit 210 acquires the voltage value of the load end 250, and benefit for connecting load end 250
It is compared with the voltage value and default pressure stabilizing value, determines whether the load end 250 is in under-voltage or short-circuit condition；
The control circuit 220 connects the sampling comparison circuit 210, for the load end 250 be in it is under-voltage or
Pressure limiting instruction is generated when short-circuit condition is sent to the switching circuit 230；
The switching circuit 230 connects the IC chip feed circuit 240, for limiting after receiving the pressure limiting instruction
Make the voltage that the load end is transmitted to the IC chip feed circuit 240；
The IC chip feed circuit 240 connects the load end, for feeding back to the output signal of the load end
IC chip.
In the utility model embodiment, the above-mentioned more detailed function description of modules can be with reference in previous embodiment
The content of corresponding portion, details are not described herein.
In the utility model embodiment, which includes first resistor 21, second resistance 22, pressure stabilizing
Pipe 23 and the first triode 24；Described 21 one end of first resistor connects the anode of the LED light, and the other end connects the pressure stabilizing
Pipe 23, for the voltage value of the load end of acquisition to be transmitted to the voltage-stabiliser tube 23；The voltage-stabiliser tube 23 connects the described 1st
The emitter of pole pipe 24, when for being greater than the pressure stabilizing value of the voltage-stabiliser tube 23 in the voltage value, the conducting of voltage-stabiliser tube 23 is simultaneously
First triode 24 is connected；The base stage of first triode 24 connects the second resistance 22, the second resistance 22
The other end connect the cathode of the load end；The collector of first triode 24 connects the control circuit 220, is used for
In first triode 24 conducting, outputting drive voltage is to the control circuit 220.
In the utility model embodiment, which includes the second triode 25, third transistor 26 and driving
Power supply 27；The base stage of second triode 25 is used to connect the collector of first triode 24, second triode
25 collector is for connecting the driving power 27, and the emitter of second triode 25 is for being grounded；Described 3rd 3
The base stage of pole pipe 26 is used to connect the collector of second triode 25, and the collector of the third transistor 26 is for connecting
The driving power 27 and the switching circuit 230, the emitter of the third transistor 26 is for being grounded.
In the utility model embodiment, between the base stage of second triode 25 and the collector of first triode 24
It is connected with 3rd resistor 28；The 4th resistance is connected between the collector and the driving power 27 of second triode 25
29；The 5th resistance 30 is connected between the base stage of the third transistor 26 and the collector of second triode 25；It is described
The 6th resistance 31 is connected between the collector of third transistor 26 and the driving power 27.
In the utility model embodiment, which includes metal-oxide-semiconductor 32 and the 7th resistance 33；The metal-oxide-semiconductor 32
Grid be used to connect the collector of the driving power 27 and the third transistor 26；The source electrode of the metal-oxide-semiconductor 32 is used
In the connection IC chip feed circuit 240；The drain of the metal-oxide-semiconductor 32 is used to connect the cathode of the load end, and passes through
7th resistance 33 connects the IC chip feed circuit 240.Wherein, the resistance value of the 7th resistance 33 is greater than 10 kilohms.
In the utility model embodiment, which includes IC chip feedback pin 34, the 8th resistance 35
And diode 36；The IC chip feedback pin 34 is used to connect the source electrode of the metal-oxide-semiconductor 32, and is connected by the 7th resistance 33
Connect the cathode of the load end；For connecting the IC chip feedback pin 34, the other end is used for for described 8th resistance, 35 one end
Ground connection；The anode of the diode 36 is for connecting the IC chip feedback pin 34, and cathode is for being grounded.
The IC chip of the utility model embodiment protects circuit 200, when load end works normally, between positive and negative anodes
Voltage value is greater than the pressure stabilizing value of voltage-stabiliser tube 23, at this time voltage-stabiliser tube 23 and the conducting of the first triode 24.It is led in the first triode 24
In the case where logical, the collector output voltage of the first triode 24, and second triode 25 is driven by 3rd resistor 28, make
Second triode 25 conducting, and the collector of the second triode 25 is made to export low level.And the base stage of third transistor 26 connects
The collector of the second triode 25 is connect, therefore the driving voltage of the base stage of third transistor 26 is low level, makes the three or three pole
Pipe 26 can not be connected.In the case where third transistor 26 can not be connected, driving power 27 drives metal-oxide-semiconductor by the 6th resistance 31
32 grid communicates the source electrode of metal-oxide-semiconductor 32 and drain.Resistance value between the source electrode and drain of the metal-oxide-semiconductor 32 is communicating
In the case of it is very low, can be ignored, thus the cathode of load end can be approximately considered be connected directly to IC chip feedback draw
Load end output short message number is fed back to IC chip by IC chip feedback pin 34 by foot 34.
The IC chip of the utility model embodiment protects circuit 200, when load end is under-voltage or short-circuit, between cathode
Voltage value is less than the pressure stabilizing value of voltage-stabiliser tube 23, and voltage-stabiliser tube 23 and the first triode 24 are not turned at this time, and the second triode
25 are also not turned on.And driving power 27 drives third transistor 26 by the 4th resistance 29 and the 5th resistance 30, makes the three or three pole
Pipe 26 is connected.And the collector of the third transistor 26 after being connected exports low level, lead the metal-oxide-semiconductor 32 for connecting collector can not
It is logical, therefore the cathode of load end is by being connected to IC chip feedback pin 34 after the 7th resistance 33, due to the resistance of the 7th resistance 33
Value consumes most of voltage of output signal at 10 kilohms or more, becomes the voltage for being transmitted to IC chip feedback pin 34
It is small, to protect IC chip.Wherein, above-mentioned load end includes LED light.
The IC chip of the utility model embodiment protects circuit 200, simple using voltage-stabiliser tube, triode, metal-oxide-semiconductor and resistance etc.
Single device constitutes the under-voltage and short-circuit protection circuit of constant current output circuit, and circuit is simple, and debugging is convenient, practical and energy
Enough realize PCB miniaturization.It is realized and is controlled using switching devices such as triode and metal-oxide-semiconductors, switching speed is fast, makes to protect speed fast,
High reliablity.
Embodiment 3
Fig. 3 is a kind of circuit diagram for IC chip protection circuit that the utility model embodiment 3 provides.
It includes sampling comparison circuit 310, control circuit 320, switching circuit 330 and IC that the IC chip, which protects circuit 300,
Chip feed circuit 340；
The sampling comparison circuit 310 connects load end, for acquiring the voltage value of the load end, and utilizes the electricity
Pressure value is compared with default pressure stabilizing value, determines that the output of the load end is in under-voltage or short-circuit condition；
The control circuit 320 connects the sampling comparison circuit 310, is in under-voltage for the output in the load end
Or pressure limiting instruction is generated when short-circuit condition and is sent to the switching circuit 330；
The switching circuit 330 connects the IC chip feed circuit 340, for limiting after receiving the pressure limiting instruction
Make the voltage that the load end is transmitted to the IC chip feed circuit 340；
The IC chip feed circuit 340 connects the load end, for feeding back to the output signal of the load end
IC chip.
In the utility model embodiment, the above-mentioned more detailed function description of modules can be with reference in previous embodiment
The content of corresponding portion, details are not described herein.
In the utility model embodiment, which includes IC1 amplifier chip 321, driving power 322 and base
Quasi- voltage 323；First pin of the IC1 amplifier chip 321 is for connecting the switching circuit；The IC1 amplifier chip 321
Second pin for connecting the reference voltage 323；The third pin of the IC1 amplifier chip 321 is for connecting described adopt
Sample comparison circuit, and pass through resistance eutral grounding；4th pin of the IC1 amplifier chip 321 is for being grounded；The IC1 amplifier core
8th pin of piece 321 is for connecting the driving power 322.
In the utility model embodiment, when load end is under-voltage or short-circuit, the voltage value between cathode is less than voltage-stabiliser tube
Pressure stabilizing value, make to sample voltage-stabiliser tube and triode in contrast circuit 310 and be not turned on, therefore the of IC1 amplifier chip 321
Three pin electrode input ends are low level by resistance eutral grounding, and second pin connects reference voltage 323, and second pin voltage is greater than the
Three pins, therefore the output of IC1 amplifier chip 321 is zero, then the metal-oxide-semiconductor of switching circuit 330 can not be connected, and load end divides cathode
The feedback pin that IC chip is then connected by big resistance, to protect IC chip.Wherein, above-mentioned load end includes LED light.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation
Or replacement, it should be covered within the scope of the utility model.Therefore, the protection scope of the utility model is answered described with power
Subject to the protection scope that benefit requires.
Claims (10)
1. a kind of IC chip protects circuit, which is characterized in that including sampling comparison circuit, control circuit, switching circuit and IC
Chip feed circuit；
The sampling comparison circuit for connecting load end to acquire the voltage value of the load end, and using the voltage value with
Default pressure stabilizing value compares, and determines whether the load end is in under-voltage or short-circuit condition；
The control circuit connects the sampling comparison circuit, for generating when the load end is in under-voltage or short-circuit condition
Pressure limiting instruction is sent to the switching circuit；
The switching circuit connects the IC chip feed circuit, for limiting the load after receiving the pressure limiting instruction
End is transmitted to the voltage of the IC chip feed circuit；
The IC chip feed circuit connects the load end, for the output signal of the load end to be fed back to IC chip.
2. IC chip according to claim 1 protects circuit, which is characterized in that the sampling comparison circuit includes first
Resistance, second resistance, voltage-stabiliser tube and the first triode；
Described first resistor one end connects the anode of the load end, and the other end connects the voltage-stabiliser tube, negative for what will be acquired
The voltage value for carrying end is transmitted to the voltage-stabiliser tube；
The voltage-stabiliser tube connects the emitter of first triode, for being greater than the pressure stabilizing of the voltage-stabiliser tube in the voltage value
When value, the voltage-stabiliser tube is connected and first triode is connected；
The base stage of first triode connects the second resistance, and the other end of the second resistance connects the load end
Cathode；
The collector of first triode connects the control circuit, for the output driving in first triode ON
Voltage is to the control circuit.
3. IC chip according to claim 2 protects circuit, which is characterized in that the control circuit includes the two or three pole
Pipe, third transistor and driving power；
The base stage of second triode connects the collector of first triode, and the collector of second triode is used for
Connect the driving power, the emitter ground connection of second triode；
The base stage of the third transistor connects the collector of second triode, the collector connection of the third transistor
The driving power and the switching circuit, the emitter ground connection of the third transistor.
4. IC chip according to claim 3 protects circuit, which is characterized in that the base stage of second triode with it is described
3rd resistor is connected between the collector of first triode；Between the collector and the driving power of second triode
It is connected with the 4th resistance；The 5th electricity is connected between the base stage of the third transistor and the collector of second triode
Resistance；The 6th resistance is connected between the collector of the third transistor and the driving power.
5. IC chip according to claim 3 protects circuit, which is characterized in that the switching circuit include metal-oxide-semiconductor and
7th resistance；
The grid of the metal-oxide-semiconductor is used to connect the collector of the driving power and the third transistor；
The source electrode of the metal-oxide-semiconductor is for connecting the IC chip feed circuit；
The drain of the metal-oxide-semiconductor is used to connect the cathode of the load end, and connects the IC chip by the 7th resistance
Feed circuit.
6. IC chip according to claim 5 protects circuit, which is characterized in that the IC chip feed circuit includes IC core
Piece feedback pin, the 8th resistance and diode；
The IC chip feedback pin connects the source electrode of the metal-oxide-semiconductor, and the cathode of the load end is connected by the 7th resistance；
Described 8th resistance one end connects the IC chip feedback pin, other end ground connection；
The anode of the diode connects the IC chip feedback pin, cathode ground connection.
7. IC chip according to claim 6 protects circuit, which is characterized in that the resistance value of the 7th resistance is greater than 10,000
Ohm.
8. IC chip according to claim 6 protects circuit, which is characterized in that when the load end is under-voltage or short-circuit,
The voltage-stabiliser tube, first triode and second triode are not turned on, and the base stage of the third transistor receives institute
It is connected after stating the electric energy of driving power transmission, and exports the grid of low level to the metal-oxide-semiconductor in collector；The metal-oxide-semiconductor
Grid is not turned on after receiving the low level, and the output signal of the cathode of the load end after the 7th electric resistance partial pressure by passing
Transport to the IC chip feedback pin.
9. IC chip according to claim 2 protects circuit, which is characterized in that the control circuit includes IC1 amplifier core
Piece, driving power and reference voltage；
First pin of the IC1 amplifier chip connects the switching circuit；
The second pin of the IC1 amplifier chip connects the reference voltage；
The third pin of the IC1 amplifier chip connects the sampling comparison circuit, and passes through resistance eutral grounding；
4th pin of the IC1 amplifier chip is grounded；
8th pin of the IC1 amplifier chip connects the driving power.
10. IC chip according to any one of claims 1 to 9 protects circuit, which is characterized in that the load end includes
LED light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920664950.2U CN209571817U (en) | 2019-05-09 | 2019-05-09 | IC chip protects circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920664950.2U CN209571817U (en) | 2019-05-09 | 2019-05-09 | IC chip protects circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209571817U true CN209571817U (en) | 2019-11-01 |
Family
ID=68336374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920664950.2U Active CN209571817U (en) | 2019-05-09 | 2019-05-09 | IC chip protects circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209571817U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265975A (en) * | 2019-05-09 | 2019-09-20 | 四川莱福德科技有限公司 | IC chip protects circuit |
-
2019
- 2019-05-09 CN CN201920664950.2U patent/CN209571817U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265975A (en) * | 2019-05-09 | 2019-09-20 | 四川莱福德科技有限公司 | IC chip protects circuit |
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