CN208767771U - Over-and under-voltage protects circuit - Google Patents
Over-and under-voltage protects circuit Download PDFInfo
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- CN208767771U CN208767771U CN201821382615.5U CN201821382615U CN208767771U CN 208767771 U CN208767771 U CN 208767771U CN 201821382615 U CN201821382615 U CN 201821382615U CN 208767771 U CN208767771 U CN 208767771U
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Abstract
The over-and under-voltage of the utility model protects circuit, passes through setting control module, overvoltage protective module, under-voltage protective module and isolated location.In actual over-and under-voltage protection circuit application process; when the voltage for being input to constant-current supply driving plate is greater than maximum voltage preset value; control module exports in IC chip enable end of the high level signal to constant-current supply driving plate in the first level output end, and control constant-current supply driving plate does not work；When the voltage for being input to constant-current supply driving plate is less than minimum voltage preset value; control module is in second electrical level output end output high level signal into the IC chip enable end to constant-current supply driving plate; control constant-current supply driving plate does not work equally; over-voltage or under-voltage protection are played to constant-current supply driving plate, prevent constant-current supply driving plate from working in inappropriate voltage range.
Description
Technical field
The utility model relates to technical field of LED display, protect circuit more particularly to a kind of over-and under-voltage.
Background technique
Currently, LED display is applied to various fields, such as hotel, megastore and highway etc..LED
Display screen is made by LED material, and LED has negative temperature feature as sensitive semiconductor devices, thus is applying
It needs to carry out steady-working state and protection to it in journey, to produce the concept of driving.LED component wants driving power
It asks almost without harshness, LED can be directly connected to the electric main of 220V unlike common incandescent lamp bulb.LED is the low of 2-3 volt
Voltage driving, it is necessary to design complicated varying circuit, the LED light of different purposes will be equipped with different power supply adaptors, international city
Foreign customers are to the efficiency conversion of LED drive power, the requirement of effective power, constant current accuracy, power source life, the pretty Rong of electromagnetism on field
It is all very high, it designs a good power supply and has to comprehensively consider these factors, because power supply is all right in the effect of entire lamps and lanterns
It is equally more important than human heart.
Accordingly, it is considered to arrive the above problem, during the actual fabrication of LED display, research staff would generally be aobvious in LED
Display screen is internally provided with constant-current driving power supply plate, stablizes output services voltage, LED from constant-current driving power supply plate to LED display
Display screen receives stable work electricity to stable work.In order to allow LED display can stablize, safety work, research and development
Monitoring circuit would generally be arranged in the output end of constant-current supply driving plate in personnel, real-time to the voltage of constant-current supply driving plate output
Monitoring prevents the spread of voltage of constant-current supply driving plate output and LED display is caused to can not work normally.But due to existing
Constant-current supply driving plate all only output end be arranged voltage monitoring circuit, constant-current supply driving plate is as electronic circuit, equally
Stable input voltage is also required to by its normal work, if not carrying out to the input voltage for being input to constant-current supply driving plate real
When monitor, cause constant-current supply driving plate can not work normally, constant-current supply driving plate is also just steady without the output of normal direction LED display
Fixed output voltage, causes LED display can not work normally.
Utility model content
The purpose of the utility model is to overcome shortcomings in the prior art, and constant-current supply can be driven by providing one kind
What the input voltage of plate was monitored in real time, prevent input voltage over-voltage or under-voltage over-and under-voltage from protecting circuit.
The purpose of this utility model is achieved through the following technical solutions:
A kind of over-and under-voltage protection circuit, comprising:
The power input of control module, the control module is electrically connected with reference power supply, the ground connection of the control module
End ground connection；
Overvoltage protective module, the overvoltage protective module include the first partial pressure unit and the first feedback unit, described first
The first voltage input terminal of partial pressure unit is electrically connected with external power supply, the first sampling end of first partial pressure unit and the control
The first voltage input terminal of molding block is electrically connected, and the second voltage input terminal of first partial pressure unit is electrically connected with reference power supply
It connects, the second sampling end of first partial pressure unit is electrically connected with the first reference voltage input of the control module, described
The ground terminal of first partial pressure unit is grounded, the feedback input end of first feedback unit and the first voltage of the control module
Input terminal electrical connection, the feedback output end of first feedback unit are electrically connected with the first level output end of the control module
It connects；
Under-voltage protective module, the under-voltage protective module include the second partial pressure unit and the second feedback unit, described second
The first voltage input terminal of partial pressure unit is electrically connected with external power supply, the first sampling end of second partial pressure unit and the control
The second voltage input terminal of molding block is electrically connected, and the second voltage input terminal of second partial pressure unit is electrically connected with reference power supply
It connects, the second sampling end of second partial pressure unit is electrically connected with the second reference voltage input of the control module, described
The ground terminal of second partial pressure unit is grounded, the feedback input end of second feedback unit and the second benchmark of the control module
Voltage input end electrical connection, the feedback output end of second feedback unit and the second electrical level output end electricity of the control module
Connection；And
Isolated location, the first end of the isolated location are electrically connected with the first level output end of the control module, institute
The second end for stating isolated location is electrically connected with the second electrical level output end of the control module.
In a wherein embodiment, first partial pressure unit include first resistor, second resistance, 3rd resistor and
4th resistance, first voltage input terminal and external power supply electricity of the first end of the first resistor as first partial pressure unit
Connection, the second end of the first resistor as first partial pressure unit the first sampling end respectively with the control module
The first end of first voltage input terminal and the second resistance is electrically connected, the first partial pressure unit described in the conduct of the second resistance
Ground terminal ground connection, second source input terminal and the benchmark electricity of the first end of the 3rd resistor as first partial pressure unit
Source electrical connection, the second end of the 3rd resistor as first partial pressure unit the second sampling end respectively with the control mould
First reference voltage input of block and the first end of the 4th resistance electrical connection, the second end of the 4th resistance with it is described
The second end of second resistance is electrically connected.
In a wherein embodiment, first partial pressure unit further includes first capacitor, and the of the first capacitor
One end is electrically connected with the first end of the second resistance, and the second end of the first capacitor is electrically connected with the second resistance.
In a wherein embodiment, the first partial pressure unit further includes the second capacitor, the first end of second capacitor
It is electrically connected with the first end of the 4th resistance, the second end of second capacitor and the second end of the 4th resistance are electrically connected
It connects.
In a wherein embodiment, first feedback unit include the 5th resistance, the first of the 5th resistance
End is electrically connected as the feedback input end of first feedback unit with the first voltage input terminal of the control module, and described the
The second end of five resistance is electrically connected as the feedback output end of first feedback unit and the first level output end of control module
It connects.
In a wherein embodiment, second partial pressure unit include the 6th resistance, the 7th resistance, the 8th resistance and
9th resistance, first voltage input terminal and external power supply electricity of the first end of the 6th resistance as second partial pressure unit
Connection, the second end of the 6th resistance as second partial pressure unit the first sampling end respectively with the control module
The electrical connection of the first end of second voltage input terminal and the 7th resistance, the second end of the 7th resistance is as described second point
The ground terminal ground connection of unit is pressed, the first end of the 8th resistance inputs end group as the second voltage of second partial pressure unit
Quasi- power electric connection, the second end of the 8th resistance as second partial pressure unit the second sampling end respectively with the control
Second reference voltage input of molding block and the first end of the 9th resistance electrical connection, the second end of the 9th resistance with
The second end of 7th resistance is electrically connected.
In a wherein embodiment, second partial pressure unit further includes third capacitor and the 4th capacitor, and described
Three capacitors are connect with the 7th resistor coupled in parallel, and the 4th capacitor is connect with the 9th resistor coupled in parallel,
In a wherein embodiment, the second partial pressure unit further includes the tenth resistance, the tenth resistance and described the
Three capacitors are connected in parallel.
In a wherein embodiment, second feedback unit includes eleventh resistor, the eleventh resistor
First end is electrically connected as the feedback input end of second feedback unit and the second reference voltage input of the control module
It connects, feedback output end and the second of the control module of the second end of the eleventh resistor as second feedback unit
Level output end electrical connection.
In a wherein embodiment, the isolated location includes first diode and the second diode, and described first
The anode of diode is electrically connected with the first level output end of the control module, the cathode of the first diode and described the
The cathode of two diodes is electrically connected, and the anode of second diode is electrically connected with the second electrical level output end of the control module
It connects.
Compared with prior art, the utility model at least has the following advantages:
The over-and under-voltage of the utility model protects circuit, by the way that control module, overvoltage protective module, under-voltage protection mould is arranged
Block and isolated location.In actual over-and under-voltage protection circuit application process, when the voltage for being input to constant-current supply driving plate
When greater than maximum voltage preset value, control module exports high level signal to constant-current supply driving plate in the first level output end
In IC chip enable end, control constant-current supply driving plate does not work；When the voltage for being input to constant-current supply driving plate is less than minimum
When voltage preset value, control module exports high level signal to the IC chip to constant-current supply driving plate in second electrical level output end
In enable end, control constant-current supply driving plate does not work equally, plays over-voltage or under-voltage protection to constant-current supply driving plate,
Prevent constant-current supply driving plate from working in inappropriate voltage range.
Detailed description of the invention
Fig. 1 is the circuit theory schematic diagram of the over-and under-voltage protection circuit in one embodiment of the utility model.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The better embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making practical new to this
The disclosure of type understands more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein packet
Include any and all combinations of one or more related listed items.
Referring to Fig. 1, over-and under-voltage protection circuit 10 includes control module 100, overvoltage protective module 200, under-voltage protection
Module 300 and isolated location；The power input of control module 100 is electrically connected with reference power supply, the ground terminal of control module 100
Ground connection；Overvoltage protective module 200 includes the first partial pressure unit 210 and the first feedback unit 220, and the of the first partial pressure unit 210
One voltage input end is electrically connected with external power supply, the first sampling end of the first partial pressure unit 210 and the first electricity of control module 100
Input terminal electrical connection is pressed, the second voltage input terminal of the first partial pressure unit 210 is electrically connected with reference power supply, the first partial pressure unit
210 the second sampling end is electrically connected with the first reference voltage input of control module, the ground connection termination of the first partial pressure unit 210
Ground, the feedback input end of the first feedback unit 220 are electrically connected with the first voltage input terminal of control module 100, the first feedback
The feedback output end of member 220 is electrically connected with the first level output end of control module 100；Under-voltage protective module 300 includes second
Partial pressure unit 310 and the second feedback unit 320, the first voltage input terminal of the second partial pressure unit 310 are electrically connected with external power supply,
First sampling end of the second partial pressure unit 310 is electrically connected with the second voltage input terminal of control module 100, the second partial pressure unit
310 second voltage input terminal is electrically connected with reference power supply, the second sampling end and control module 100 of the second partial pressure unit 310
The second reference voltage input electrical connection, the second partial pressure unit 310 ground terminal ground connection, the feedback of the second feedback unit 320
Input terminal is electrically connected with the second reference voltage input of control module 100, the feedback output end of the second feedback unit 320 and control
The second electrical level output end of molding block 100 is electrically connected；The first end of isolated location and the first level output end of control module 100
Electrical connection, the second end of isolated location are electrically connected with the second electrical level output end of control module 100.In this way, in actual over-voltage
In 10 application process of under-voltage protecting circuit, when the voltage for being input to constant-current supply driving plate is greater than maximum voltage preset value, control
Molding block 100 exports in IC chip enable end of the high level signal to constant-current supply driving plate in the first level output end, control
Constant-current supply driving plate does not work；When the voltage for being input to constant-current supply driving plate is less than minimum voltage preset value, mould is controlled
For block 100 in second electrical level output end output high level signal into the IC chip enable end to constant-current supply driving plate, control is permanent
Galvanic electricity source driving plate does not work equally, plays over-voltage or under-voltage protection to constant-current supply driving plate, prevents constant-current supply from driving
Movable plate works in inappropriate voltage range.Specifically, control module 100 is LM358 chip, for the first partial pressure unit
210 and second the voltage value of partial pressure unit 310 be compared, and be the IC built in outputs level signals to constant-current supply driving plate
In chip, it is, of course, also possible to using other commercial chips, as long as can be realized to first partial pressure unit 210 and second point
Pressure unit 310 voltage value be compared and outputs level signals to constant-current supply driving plate built in IC chip in.
It should be noted that the first level output end and second electrical level output end of control module 100 all with constant-current supply
The enable end of the build-in IC chip of driving plate is electrically connected, when the electric voltage over press that is input to constant-current supply driving plate or it is under-voltage when,
Over-and under-voltage protects circuit to carry out over-voltage or under-voltage protection to constant-current supply driving plate, prevents constant-current supply driving plate from not conforming to
Work in suitable voltage range.
Further, referring to Fig. 1, in one embodiment, the first partial pressure unit 210 include first resistor R1,
Second resistance R2,3rd resistor R3 and the 4th resistance R4, the first end of first resistor R1 as the first partial pressure unit 210 first
Voltage input end is electrically connected with external power supply, first sampling end of the second end of first resistor R1 as the first partial pressure unit 210
It is electrically connected respectively with the first end of the first voltage input terminal of control module 100 and second resistance R2, the conduct of second resistance R2
The ground terminal of first partial pressure unit 210 is grounded, and the first end of 3rd resistor R3 is defeated as the second source of the first partial pressure unit 210
Enter end to be electrically connected with reference power supply, the second end of 3rd resistor R3 as the first partial pressure unit 210 the second sampling end respectively with
First reference voltage input of control module 100 and the first end electrical connection of the 4th resistance R4, the second end of the 4th resistance R4
It is electrically connected with the second end of second resistance R2.
Further, referring to Fig. 1, in one embodiment, the first partial pressure unit 210 further includes first capacitor
The first end of C1, first capacitor C1 are electrically connected with the first end of second resistance R2, the second end and second resistance of first capacitor C1
The electrical connection of R2.
Further, referring to Fig. 1, in one embodiment, the first partial pressure unit 210 further includes the second capacitor
The first end of C2, the second capacitor C2 are electrically connected with the first end of the 4th resistance R4, the second end and the 4th resistance of the second capacitor C2
The second end of R4 is electrically connected.
Further, referring to Fig. 1, in one embodiment, the first feedback unit 220 includes the 5th resistance R5,
The first end of 5th resistance R5 is inputted as the feedback input end of the first feedback unit 220 and the first voltage of control module 100
End electrical connection, feedback output end and the first of control module 100 of the second end of the 5th resistance R5 as the first feedback unit 220
Level output end electrical connection.
Further, referring to Fig. 1, in one embodiment, the second partial pressure unit 310 include the 6th resistance R6,
7th resistance R7, the 8th resistance R8 and the 9th resistance R9, the first end of the 6th resistance R6 as the second partial pressure unit 310 first
Voltage input end is electrically connected with external power supply, first sampling end of the second end of the 6th resistance R6 as the second partial pressure unit 310
It is electrically connected respectively with the first end of the second voltage input terminal of control module 100 and the 7th resistance R7, the second of the 7th resistance R7
End as the second partial pressure unit 310 ground terminal ground connection, the first end of the 8th resistance R8 as the second partial pressure unit 310 second
The electrical connection of voltage input end reference power supply, second sampling end point of the second end of the 8th resistance R8 as the second partial pressure unit 310
It is not electrically connected with the first end of the second reference voltage input of control module 100 and the 9th resistance R9, the of the 9th resistance R9
Two ends are electrically connected with the second end of the 7th resistance R7.
Further, referring to Fig. 1, in one embodiment, the second partial pressure unit 310 further includes third capacitor C3
It being connected in parallel with the 4th capacitor C4, third capacitor C3 with the 7th resistance R7, the 4th capacitor C4 and the 9th resistance R9 is connected in parallel,
Further, referring to Fig. 1, in one embodiment, the second partial pressure unit 310 further includes the tenth resistance
R10, the tenth resistance R10 are connected in parallel with third capacitor C3.
Further, referring to Fig. 1, in one embodiment, the second feedback unit 320 includes eleventh resistor
The first end of R11, eleventh resistor R11 are as the feedback input end of the second feedback unit 320 and the second base of control module 100
Quasi- voltage input end electrical connection, feedback output end and control of the second end of eleventh resistor R11 as the second feedback unit 320
The second electrical level output end of module 100 is electrically connected.
Further, referring to Fig. 1, in one embodiment, isolated location includes first diode D1 and second
The anode of diode D2, first diode D1 are electrically connected with the first level output end of control module 100, first diode D1's
Cathode is electrically connected with the cathode of the second diode D2, and the anode of the second diode D1 and the second electrical level of control module 100 export
End electrical connection.
The concrete operating principle of over-and under-voltage protection circuit is described in detail below:
Control module 100 is by obtaining over-voltage benchmark protection value in the first reference voltage input, that is, from the first benchmark
The voltage that voltage input end is inputted to control module 100 is as over-voltage benchmark protection value, when control module 100 is in the first sampling end
When the voltage value of acquisition is greater than over-voltage benchmark protection value, control module 100 can export high level signal in the first level output end,
High level signal is input in the IC chip enable end built in constant-current supply driving plate, IC chip determines power input at this time
Electric voltage over press, IC chip control constant-current supply driving plate do not work, effectively prevent constant-current supply driving plate input electricity
Pressure works in the event of excess pressure；
Control module 100 is by obtaining over-voltage benchmark protection value in the second reference voltage input, that is, from the second benchmark
The voltage that voltage input end is inputted to control module 100 is as under-voltage benchmark protection value, when control module 100 is in the second sampling end
When the voltage value of acquisition is greater than under-voltage benchmark protection value, control module 100 can export high level signal in second electrical level output end,
High level signal is input in the IC chip enable end built in constant-current supply driving plate, IC chip determines power input at this time
Under-voltage, IC chip control constant-current supply driving plate do not work, effectively prevent constant-current supply driving plate input electricity
Be pressed in it is under-voltage in the case where work.
It should be noted that first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 6th resistance R6,
7th resistance R7, the 8th resistance R8, the 9th resistance R9 and the tenth resistance R10 play the role of partial pressure；5th resistance R5 with
And eleventh resistor R11 plays the use of negative-feedback, the 5th resistance R5 makes the amplitude range of over-voltage a reference value bigger, improved
Effect is pressed, eleventh resistor R11 makes the amplitude range of under-voltage a reference value bigger, improves under-voltage effect；First capacitor C1,
Two capacitor C2, third capacitor C3 and the 4th capacitor C4 play the role of filtering；First diode D1 and the second diode D2
The level signal that can prevent the first level output end from exporting has influenced the level signal of second electrical level output end, plays isolation
Effect.
The over-and under-voltage of the utility model protects circuit, by the way that control module, overvoltage protective module, under-voltage protection mould is arranged
Block and isolated location.In actual over-and under-voltage protection circuit application process, when the voltage for being input to constant-current supply driving plate
When greater than maximum voltage preset value, control module exports high level signal to constant-current supply driving plate in the first level output end
In IC chip enable end, control constant-current supply driving plate does not work；When the voltage for being input to constant-current supply driving plate is less than minimum
When voltage preset value, control module exports high level signal to the IC chip to constant-current supply driving plate in second electrical level output end
In enable end, control constant-current supply driving plate does not work equally, plays over-voltage or under-voltage protection to constant-current supply driving plate,
Prevent constant-current supply driving plate from working in inappropriate voltage range.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of over-and under-voltage protects circuit characterized by comprising
The power input of control module, the control module is electrically connected with reference power supply, the ground connection termination of the control module
Ground；
Overvoltage protective module, the overvoltage protective module include the first partial pressure unit and the first feedback unit, first partial pressure
The first voltage input terminal of unit is electrically connected with external power supply, the first sampling end of first partial pressure unit and the control mould
The first voltage input terminal of block is electrically connected, and the second voltage input terminal of first partial pressure unit is electrically connected with reference power supply, institute
The second sampling end for stating the first partial pressure unit is electrically connected with the first reference voltage input of the control module, and described first point
Press the ground terminal ground connection of unit, the feedback input end of first feedback unit and the first voltage input terminal of the control module
Electrical connection, the feedback output end of first feedback unit are electrically connected with the first level output end of the control module；
Under-voltage protective module, the under-voltage protective module include the second partial pressure unit and the second feedback unit, second partial pressure
The first voltage input terminal of unit is electrically connected with external power supply, the first sampling end of second partial pressure unit and the control mould
The second voltage input terminal of block is electrically connected, and the second voltage input terminal of second partial pressure unit is electrically connected with reference power supply, institute
The second sampling end for stating the second partial pressure unit is electrically connected with the second reference voltage input of the control module, and described second point
The ground terminal ground connection of unit is pressed, the feedback input end of second feedback unit and the second reference voltage of the control module are defeated
Enter end electrical connection, the feedback output end of second feedback unit is electrically connected with the second electrical level output end of the control module；
And
Isolated location, the first end of the isolated location are electrically connected with the first level output end of the control module, it is described every
It is electrically connected from the second end of unit with the second electrical level output end of the control module.
2. over-and under-voltage according to claim 1 protects circuit, which is characterized in that first partial pressure unit includes first
Resistance, second resistance, 3rd resistor and the 4th resistance, the first end of the first resistor as first partial pressure unit
One voltage input end is electrically connected with external power supply, and the second end of the first resistor is adopted as the first of first partial pressure unit
Sample end is electrically connected with the first end of the first voltage input terminal of the control module and the second resistance respectively, second electricity
The ground terminal of the first partial pressure unit as described in of resistance is grounded, and the first end of the 3rd resistor is as first partial pressure unit
Second source input terminal be electrically connected with reference power supply, the second end of the 3rd resistor as first partial pressure unit
Two sampling ends are electrically connected with the first end of the first reference voltage input of the control module and the 4th resistance respectively, institute
The second end for stating the 4th resistance is electrically connected with the second end of the second resistance.
3. over-and under-voltage according to claim 2 protects circuit, which is characterized in that first partial pressure unit further includes the
One capacitor, the first end of the first capacitor are electrically connected with the first end of the second resistance, the second end of the first capacitor
With being electrically connected for the second resistance.
4. over-and under-voltage according to claim 3 protects circuit, which is characterized in that the first partial pressure unit further includes the second electricity
Hold, the first end of second capacitor is electrically connected with the first end of the 4th resistance, the second end of second capacitor and institute
State the second end electrical connection of the 4th resistance.
5. over-and under-voltage according to claim 1 protects circuit, which is characterized in that first feedback unit includes the 5th
Resistance, feedback input end and the first of the control module of the first end of the 5th resistance as first feedback unit
Voltage input end electrical connection, feedback output end and control mould of the second end of the 5th resistance as first feedback unit
First level output end of block is electrically connected.
6. over-and under-voltage according to claim 1 protects circuit, which is characterized in that second partial pressure unit includes the 6th
Resistance, the 7th resistance, the 8th resistance and the 9th resistance, the first end of the 6th resistance as second partial pressure unit
One voltage input end is electrically connected with external power supply, and the second end of the 6th resistance is adopted as the first of second partial pressure unit
Sample end is electrically connected with the first end of the second voltage input terminal of the control module and the 7th resistance respectively, the 7th electricity
The second end of resistance is grounded as the ground terminal of second partial pressure unit, and the first end of the 8th resistance is as described second point
The second voltage input terminal reference power supply electrical connection of unit is pressed, the second end of the 8th resistance is as second partial pressure unit
First end of second sampling end respectively with the second reference voltage input of the control module and the 9th resistance be electrically connected
It connects, the second end of the 9th resistance is electrically connected with the second end of the 7th resistance.
7. over-and under-voltage according to claim 6 protects circuit, which is characterized in that second partial pressure unit further includes the
Three capacitors and the 4th capacitor, the third capacitor are connect with the 7th resistor coupled in parallel, the 4th capacitor and the 9th electricity
Resistance is connected in parallel.
8. over-and under-voltage according to claim 7 protects circuit, which is characterized in that the second partial pressure unit further includes the tenth electricity
Resistance, the tenth resistance are connected in parallel with the third capacitor.
9. over-and under-voltage according to claim 1 protects circuit, which is characterized in that second feedback unit includes the tenth
One resistance, feedback input end and the control module of the first end of the eleventh resistor as second feedback unit
The electrical connection of second reference voltage input, feedback output of the second end of the eleventh resistor as second feedback unit
End is electrically connected with the second electrical level output end of the control module.
10. over-and under-voltage according to claim 1 protects circuit, which is characterized in that the isolated location includes the one or two
Pole pipe and the second diode, the anode of the first diode are electrically connected with the first level output end of the control module, institute
The cathode for stating first diode is electrically connected with the cathode of second diode, the anode of second diode and the control
The second electrical level output end of module is electrically connected.
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| CN201821382615.5U CN208767771U (en) | 2018-08-27 | 2018-08-27 | Over-and under-voltage protects circuit |
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| CN110174570A (en) * | 2019-05-27 | 2019-08-27 | 苏州浪潮智能科技有限公司 | There is the method and system vibrated in a kind of solution VR output voltage in under-voltage protection |
| CN113079609A (en) * | 2021-06-04 | 2021-07-06 | 上海芯龙半导体技术股份有限公司 | Constant current control chip, system and LED constant current drive circuit |
| CN116885669A (en) * | 2023-09-08 | 2023-10-13 | 广东东菱电源科技有限公司 | MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174570A (en) * | 2019-05-27 | 2019-08-27 | 苏州浪潮智能科技有限公司 | There is the method and system vibrated in a kind of solution VR output voltage in under-voltage protection |
| CN113079609A (en) * | 2021-06-04 | 2021-07-06 | 上海芯龙半导体技术股份有限公司 | Constant current control chip, system and LED constant current drive circuit |
| CN113079609B (en) * | 2021-06-04 | 2021-08-27 | 上海芯龙半导体技术股份有限公司 | Constant current control chip, system and LED constant current drive circuit |
| CN116885669A (en) * | 2023-09-08 | 2023-10-13 | 广东东菱电源科技有限公司 | MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit |
| CN116885669B (en) * | 2023-09-08 | 2024-01-12 | 广东东菱电源科技有限公司 | MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit |
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