CN209419216U - Overvoltage protection circuit, backlight module and display device - Google Patents
Overvoltage protection circuit, backlight module and display device Download PDFInfo
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- CN209419216U CN209419216U CN201920205371.1U CN201920205371U CN209419216U CN 209419216 U CN209419216 U CN 209419216U CN 201920205371 U CN201920205371 U CN 201920205371U CN 209419216 U CN209419216 U CN 209419216U
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Abstract
The embodiment of the application provides an overvoltage crowbar, backlight circuit, backlight unit and display device, wherein overvoltage crowbar includes: a driving chip; the sampling end of the sampling unit is used for collecting load voltage, and the signal output end of the sampling unit is connected with the overvoltage protection pin of the driving chip; the current feedback input end of the voltage-controlled current source unit is connected with the signal output end of the sampling unit; the input end of the starting bias unit is used for collecting the load starting signal, and the output end of the starting bias unit is connected with the control voltage input end of the voltage-controlled current source unit; and the input end of the feedback unit is used for collecting the load voltage, and the output end of the feedback unit is connected with the control voltage input end of the voltage-controlled current source unit. The embodiment of the application optimizes the existing overvoltage protection circuit, and the protection mode is more flexible.
Description
Technical field
This application involves electronic technology fields, in particular to a kind of overvoltage crowbar, backlight circuit, backlight mould
Group and display equipment.
Background technique
The application belongs to the relevant technologies relevant to the application for the description of background technique, be only used for explanation and just
In the application content for understanding the application, it should not be construed as applicant and be specifically identified to or estimate applicant being considered the application for the first time
The prior art for the applying date filed an application.
The voltage of electrical equipment has stringent working range, can damage or burn when voltage exceeds its working range in circuit
Device is ruined, is affected the normal operation of the equipment, even will cause accident when serious.Accordingly, it is desirable to provide a kind of overvoltage crowbar pair
Circuit is protected, it is ensured that Electrical Safety.The pressure point excessively and reference voltage of some overvoltage crowbars are often fixed, protection
Mode is inflexible.
Utility model content
It is set in view of this, the embodiment of the present application provides a kind of overvoltage crowbar, backlight circuit, backlight module and display
It is standby.
In a first aspect, this application provides a kind of overvoltage crowbars, comprising:
Driving chip；
Sampling unit, the sampling end of the sampling unit is for acquiring load voltage, the signal output of the sampling unit
End connects the overvoltage protection pin of the driving chip；
The current feedback input terminal of voltage controlled current source unit, the voltage controlled current source unit connects the letter of the sampling unit
Number output end；
Start bias unit, the input terminal of the starting bias unit is described to open for acquiring the load open signal
The output end of dynamic bias unit connects the control voltage input end of the voltage controlled current source unit；
Feedback unit, the input terminal of the feedback unit is for acquiring the load voltage, the output of the feedback unit
End connects the control voltage input end of the voltage controlled current source unit.
In alternative embodiment, the sampling unit includes divider resistance and the first lower divider resistance on concatenated first；
Divider resistance connects the load anode on described first, divides on the described first lower divider resistance and described first
One end of resistance connection connects the overvoltage protection pin of the driving chip.
In alternative embodiment, the feedback unit includes divider resistance and the second lower divider resistance on concatenated second；
Divider resistance connects the load anode on described second, divides on the described second lower divider resistance and described second
One end of resistance connection connects the control voltage input end of the voltage controlled current source unit.
In alternative embodiment, the feedback unit further includes the second capacitor；
Second capacitor is in parallel with the described second lower divider resistance.
In alternative embodiment, the voltage controlled current source unit includes triode and the 5th resistance；
The base stage of the triode connects the output end of the starting bias unit and the output end of the feedback unit, institute
The collector for stating triode connects the signal output end of the sampling unit, and the emitter of the triode passes through the 5th electricity
Resistance ground connection.
In alternative embodiment, the starting bias unit includes concatenated first capacitor and diode；
The first capacitor acquires the load open signal, and the diode connects the control of the voltage controlled current source unit
Voltage input end processed.
In alternative embodiment, the triode is PNP type triode.
Second aspect, the embodiment of the present application provide a kind of backlight circuit, including mistake described in above-mentioned any one embodiment
Voltage protection circuit, the load are back light.
The third aspect, the embodiment of the present application provide a kind of backlight module, including back described in above-mentioned any one embodiment
Optical circuit.
Fourth aspect, the embodiment of the present application provide a kind of display equipment, including back described in above-mentioned any one embodiment
Optical circuit.
The embodiment of the present application has the following beneficial effects:
Overvoltage crowbar provided by the embodiments of the present application, sampling unit sample load voltage；Feedback unit is adopted
Collection load virtual voltage exports first voltage signal, control of the first voltage signal as control voltage input voltage controlled current source unit
Voltage input end processed；It loading in opening process, starting bias unit acquisition load open signal exports second voltage signal, the
Control voltage input end of two voltage signals as control voltage input voltage controlled current source unit；The circuit of voltage controlled current source unit
Feedback input end is according to the control voltage levels for controlling voltage input end, from sampling unit absorption current.It is lower to control voltage, pressure
The electric current that the current feedback input terminal of control current source cell is drawn from sampling unit is smaller, and sampling unit is exported to the voltage of OVP
It is bigger, it is equivalent to and reduces OVP protection point.It is higher to control voltage, the current feedback input terminal of voltage controlled current source unit is from sampling
The electric current that unit is drawn is bigger, and it is smaller that sampling unit exports the voltage to OVP, is equivalent to and improves OVP protection point.The application is real
It applies example and realizes and automatically adjusted pressure point, overvoltage protection is more rationally precisely.
Detailed description of the invention
Fig. 1 shows the structural schematic diagram of an embodiment of the application overvoltage crowbar；
Fig. 2 shows the circuit diagrams of an embodiment of the application overvoltage crowbar.
Specific embodiment
The application is described in further detail combined with specific embodiments below, but not as the restriction to the application.?
In following the description, what different " embodiment " or " embodiment " referred to is not necessarily the same embodiment.In addition, one or more are implemented
Special characteristic, structure or feature in example can be combined by any suitable form.
The embodiment of the present application provides a kind of overvoltage crowbar.Fig. 1 shows a reality of the application overvoltage crowbar
Apply the structural schematic diagram of example.Referring to Fig. 1, which includes:
Driving chip 10；
Sampling unit 20, the sampling end of sampling unit 20 is for acquiring load voltage, the signal output end of sampling unit 20
Connect the overvoltage protection pin of driving chip 10；
Voltage controlled current source unit 30, the signal of the current feedback input terminal connection sampling unit 20 of voltage controlled current source unit 30
Output end, the output end ground connection of voltage controlled current source unit 30；
Start bias unit 40, for the input terminal of starting bias unit 40 for acquiring load open signal, starting biasing is single
The control voltage input end of the output end connection voltage controlled current source unit 30 of member 40；
Feedback unit 50, the input terminal of feedback unit 50 is for acquiring load voltage, the output end connection of feedback unit 50
The control voltage input end of voltage controlled current source unit 30.
Overvoltage crowbar provided by the embodiments of the present application, sampling unit 20 acquires load voltage, to the practical electricity of load
Pressure is sampled；The virtual voltage of the acquisition load of feedback unit 50, the control of the first signal of output to voltage controlled current source unit 30
Voltage input end；The signal output end of the current feedback input terminal connection sampling unit 20 of voltage controlled current source unit 30.Starting is inclined
Set the acquisition load open signal of unit 40, the control voltage input end of output second signal to voltage controlled current source unit 30.First
Voltage signal and second voltage signal are inputted as the control voltage of voltage controlled current source unit 30 by control voltage input end.It is voltage-controlled
The electric current of the current feedback input terminal of current source cell 30 is directly proportional to the control control voltage of voltage input end, the reality of load
Voltage is higher, and the control voltage that feedback unit 50 inputs the control voltage input end of voltage controlled current source unit 30 is higher, voltage-controlled electricity
The electric current that the current feedback input terminal of stream source unit 30 is drawn from sampling unit 20 is bigger, and sampling unit 20 is exported to the electricity of OVP
Press it is smaller, be equivalent to improve OVP protection point.The virtual voltage of load is lower, and feedback unit 50 inputs voltage controlled current source unit
The control voltage of 30 control voltage input end is lower, and the current feedback input terminal of voltage controlled current source unit 30 is from sampling unit 20
The electric current of absorption is smaller, and the voltage of sampling unit 20 output to OVP are bigger, is equivalent to and reduces OVP protection point.The application is implemented
Example inputs voltage controlled current source unit 30,30 base of voltage controlled current source unit as feedback signal by acquisition load actual use voltage
In the height of the control voltage of input control voltage input end, direct ratio absorbs the electric current of overvoltage protection sampling unit 20, has adjusted
Sampling unit 20 is exported to the voltage of OVP, is realized and was automatically adjusted pressure point.
The embodiment of the present application is not especially limited load, such as can be the LED light string etc. as back light.
Specifically, in the embodiment of the present application, the power supply of the connection load of sampling unit 20, and to the virtual voltage of load
It is sampled, forms sampled signal；The acquisition load virtual voltage of feedback unit 50, output first voltage signal to voltage-controlled current source
The control voltage input end of unit 30；In load opening process, starting bias unit 40 collects load open signal and generates
The control voltage input end of second voltage signal input voltage controlled current source unit 30；Voltage controlled current source unit 30 is according to control electricity
It presses the control voltage of input terminal from 20 absorption current of sampling unit, regulates and controls the voltage signal of the output of sampling unit 20 to OVP.When negative
When load virtual voltage is higher, the first voltage signal that feedback unit 50 generates is higher, and feedback unit 50 exports first voltage signal
To voltage controlled current source unit 30；The control voltage input end of voltage controlled current source unit 30 receives first voltage signal, voltage controlled current
The current feedback input terminal of source unit 30 adsorbs larger current, reduces the output of sampling unit 20 to the voltage of OVP.Similarly, when
When load virtual voltage is lower, the voltage signal that feedback unit 50 exports is relatively low, and it is anti-that voltage controlled current source unit 30 controls electric current
It presents input terminal and adsorbs smaller current, increase the voltage sampling signal of the output of sampling unit 20 to OVP.The present embodiment can be adjusted automatically
Saved pressure point.
In the embodiment of the present application, in load opening process, the starting acquisition load open signal of biasing circuit 40, load is opened
The control voltage input end that activated 40 output end of biasing circuit of signal is sent to voltage controlled current source unit 30 is opened, it is inclined due to starting
The voltage signal that circuits 40 are conveyed to the control voltage input end of voltage controlled current source unit 30 is higher, voltage controlled current source unit 30
Current feedback input terminal from sampling unit 20 adsorb larger current, reduce sampling unit 20 output to OVP voltage, quite
In the protection point for improving OVP.This embodiment avoids in load opening process due to 50 false triggering overvoltage protection of feedback unit,
Circuit stability is improved, element service life is extended.
When sampling unit 20 sampled voltage be higher than reference voltage, i.e., when circuit is in overvoltage condition, sampling unit 20 by
Over-voltage signal is sent to the overvoltage protection pin OVP of driving chip 10 by signal output end, and then triggers overvoltage protection.The application
Embodiment is realized by the electric current suction-operated of voltage controlled current source unit 30 and automatically adjusted pressure point, overvoltage protection more adduction
Reason is accurate.
Fig. 2 shows the circuit diagrams of an embodiment of the application overvoltage crowbar.
Referring to fig. 2, in the embodiment of the present application, sampling unit 20 includes lower point of divider resistance R1 and first on concatenated first
Piezoresistance R2；
Divider resistance R1 connection load anode on first, the first lower divider resistance R2 ground connection, the first lower divider resistance R2 with
The overvoltage protection pin OVP of one end connection driving chip U1 of divider resistance R1 connection on first.First lower divider resistance R2 two
Overvoltage protection pin OVP of the voltage at end as sampled signal input driving chip U1.
The embodiment of the present application is not especially limited the number of upper and lower divider resistance.Such as can be single divider resistance,
It is also possible to multiple divider resistances etc..
In the application alternative embodiment, sampling unit 20 first on the lower divider resistance R2 of divider resistance R1 and first adopt
It is divided with single resistance.
Specifically, the course of work of sampling unit 20 is as follows in the embodiment of the present application: divider resistance R1 on concatenated first
Partial pressure sampling is carried out to the virtual voltage of load with the first lower divider resistance R2 bleeder circuit constituted, when sampled voltage is greater than base
When quasi- voltage, over-voltage signal is sent to driving chip 10 by the signal output end of sampling unit 20, and the over-voltage of driving chip 10 is protected
It protects pin and receives over-voltage signal, control cutting current supply circuit protects circuit element.
In the application alternative embodiment, feedback unit 50, which includes that divider resistance R4 and second is lower on concatenated second, to be divided
Resistance R5；
Divider resistance R4 connection loads positive (i.e. the anode of load supplying power supply) on second, acquires the practical electricity of load
Pressure.Second lower divider resistance R5 ground connection, one end (i.e. feedback that the second lower divider resistance R5 is connect with divider resistance R4 on second
Member 50 output end) connection voltage controlled current source unit 30 control voltage input end.The voltage at the second lower both ends divider resistance R5
Control voltage input end as feedback signal input voltage controlled current source unit 30.
In the application alternative embodiment, feedback unit 50 second on the lower divider resistance R5 of divider resistance R4 and second adopt
It is divided with single resistance.
In the embodiment of the present application, the second lower divider resistance R5 is with one end that divider resistance R4 is connect on second as feedback
The control voltage input end of the output end connection voltage controlled current source unit 30 of member 50.Specifically, feedback unit 50 in the present embodiment
The course of work it is as follows: the bleeder circuit that the lower divider resistance R5 of divider resistance R4 and second are constituted on concatenated second is to load
Virtual voltage carries out partial pressure sampling, and the voltage at the second lower both ends divider resistance R5 is exported as first voltage signal to voltage controlled current
The control voltage input end of source unit 30.When load virtual voltage is higher, the voltage that feedback unit 50 exports is higher.Work as load
When virtual voltage is lower, the voltage that feedback unit 50 exports is lower.Acquisition load virtual voltage is as feedback letter in the present embodiment
Number, and then the sampled voltage of sampling unit 20 is adjusted, overvoltage protection mode is more flexible.
In the application alternative embodiment, feedback unit 50 further includes the second capacitor C2；
Second capacitor C2 is in parallel with the second lower divider resistance R5.
In the embodiment of the present application, the second capacitor C2 is integrating capacitor.
In one embodiment, the sampled voltage of sampling unit 20 is higher than reference voltage and triggers overvoltage protection, due in circuit
Overtension, the first voltage signal that feedback unit 50 generates can increase sharply, and then adjust the sampled voltage of sampling unit 20,
Influence normal overvoltage protection.Based on this, the feedback unit 50 in the present embodiment also adds the second capacitor C2, is parallel to second
Lower divider resistance R5.After triggering overvoltage protection, the second capacitor C2 of feedback unit 50 accumulates rapidly electricity, to weaken the first electricity
Press signal.Present embodiment ensure that the normal overvoltage protection of circuit, improves circuit stability.
Further, in the application alternative embodiment, voltage controlled current source unit 30 includes triode Q1 and the 5th resistance
R3；
The output of the output end and feedback unit 50 of the base stage connection starting bias unit 40 of triode Q1, triode Q1's
Collector connects the signal output end of sampling unit 20, and the emitter of triode Q1 is grounded by the 5th resistance R3.
The embodiment of the present application is not especially limited the type of triode in voltage-controlled current source.As alternative embodiment, originally
Apply specifically using PNP type triode in embodiment.
In the embodiment of the present application, the received control voltage of the base stage of triode Q1 is the first electricity in voltage controlled current source unit 30
The superposition for pressing signal and second voltage signal, the height of the control voltage according to input control collector and adsorb from acquisition unit 20
The height of electric current.Specifically, when the control voltage of the base stage input of triode Q1 is higher, the base stage of triode Q1 controls current collection
Larger current is adsorbed from sampling unit 20 in pole, reduces the sampled voltage that sampling unit 20 is delivered to OVP.Input triode Q1 base stage
Control voltage it is lower when, the collector of triode Q1 adsorbs smaller current from sampling unit 20, and what sampling unit 20 exported adopts
Sample voltage increases.The present embodiment is realized by the electric current suction-operated of triode Q1 and automatically adjusted pressure point, and overvoltage protection is more
Adduction reason is accurate.
Further, in the application alternative embodiment, starting bias unit 40 includes concatenated first capacitor C1 and two poles
Pipe D1；
The one end first capacitor C1 acquisition load open signal, the control voltage of diode D1 connection voltage controlled current source unit 30
Input terminal.
In the embodiment of the present application, the first capacitor C1 acquisition load open signal of starting bias unit 40.Load was opened
The voltage for starting bias unit 40 in journey increases, and the second voltage signal of generation is stronger, is sent to voltage-controlled current source through output end
Unit 30 then reduces the sampled voltage that sampling unit 20 exports.This embodiment avoids load opening process in due to anti-
Present unit 50 export the first signal it is lower, may false triggering overvoltage protection the problem of.In the embodiment of the present application, by opening
The dynamic acquisition of bias unit 40 load open signal, improves the control voltage of input voltage controlled current source unit 30, it is steady to improve circuit
It is qualitative, extend element service life.
Below with reference to Fig. 1 and Fig. 2, using back light (LED light bar) as loading, to the overvoltage protection electricity of the application
The course of work on road is illustrated.
The lower divider resistance R5 of divider resistance R4 and second is used as pressure for after backlight voltage (LED+ voltage) partial pressure on second
Control the control signal of current source cell.The size of current of voltage controlled current source unit 30 is proportional to the control voltage of input.Work as LED light
When virtual voltage is higher, the electric current of voltage controlled current source unit 30 is bigger, i.e., it is from divider resistance on the first of sampling unit 20
The electric current drawn on R1 is bigger, and the pressure drop of divider resistance R1 increases on first, so that the voltage on the first lower divider resistance R2
(i.e. the sampled voltage of OVP) decline is equivalent to the OVP protection point for improving chip.
When LED light bar virtual voltage is lower, the electric current of voltage controlled current source unit 30 is smaller, i.e., it divides electricity from first
The electric current drawn on resistance R1 is smaller, and the pressure drop of divider resistance R1 reduces on first, so that the voltage on the first lower divider resistance R2
(i.e. the sampled voltage of OVP) rises, and is equivalent to the OVP protection point for reducing chip.
The effect of second capacitor C2 of the lower divider resistance R4 parallel connection of the second of feedback unit 50 is integral, is avoided when triggering
When OVP is protected, the lower divider resistance R4 voltage division signal of divider resistance R3 and second increases sharply on second, so that the set-point OVP
It quicklys increase, the problem of OVP can not be protected normally.
When backlight is not opened, since the lower divider resistance R4 voltage division signals of divider resistance R3 and second are very low on second, pressure
The electric current very little of control current source cell 30, the electric current very little drawn on divider resistance R1 from first, driving chip U1's
OVP is arranged relatively low, to avoid backlight open process false triggering OVP from protecting, backlight open signal BL_ON is passed through concatenated
First capacitor C1 and diode D1 is added in the base stage of triode Q1, so that backlight open process, 30 electric current of voltage controlled current source unit
It is larger, increase chip OVP setting value.When backlight open is completed, first capacitor C1 charging complete, starting bias unit 40 does not recur
Effect.
The embodiment of the present application also provides a kind of backlight circuit, which includes any of the above-described overvoltage crowbar,
Load is back light (such as LED light bar).The embodiment of above-mentioned overvoltage crowbar can be used for understanding and illustrating backlight electricity
The embodiment on road, no longer repeats one by one herein.
The embodiment of the present application also provides a kind of backlight modules, including backlight circuit described in above-mentioned any one embodiment.
The embodiment of the present application also provides a kind of display equipment, which includes the backlight electricity of any of the above-described embodiment
Road.
Display equipment in the embodiment of the present application includes but is not limited to LCD TV, interaction plate and intelligent blackboard etc..
Those skilled in the art can be understood that the division of " unit " or " module " in the embodiment of the present application,
Only a kind of division of logic function, there may be another division manner in actual implementation, such as multiple " units " or " mould
Block ", which can be combined or be can integrate, realizes corresponding function for one " unit " or " module ".Or one " unit " or " mould
Block " is decomposed into multiple corresponding functions of common realization." unit " or " module " in the embodiment of the present application can be can be independent
The software and/or hardware for completing specific function is completed or cooperates with other component, wherein hardware for example can be FPGA (Field-
Programmable Gate Array, field programmable gate array), IC (Integrated Circuit, integrated circuit) etc.,
This is no longer going to repeat them.
In this application, term " first ", " second " etc. are only used for the purpose of description, are not understood to indicate or imply
Relative importance or sequence；Term " multiple " then refers to two or more, unless otherwise restricted clearly.Term " installation ",
The terms such as " connected ", " connection ", " fixation " shall be understood in a broad sense, for example, " connection " may be a fixed connection, being also possible to can
Dismantling connection, or be integrally connected；" connected " can be directly connected, can also be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in this application can be understood as the case may be.
In the description of the present application, it is to be understood that the orientation or positional relationship of the instructions such as term " on ", "lower" be based on
Orientation or positional relationship shown in the drawings is merely for convenience of description the application and simplifies description, rather than indication or suggestion institute
The device or unit of finger must have specific direction, be constructed and operated in a specific orientation, it is thus impossible to be interpreted as to this Shen
Limitation please.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Those familiar with the art within the technical scope of the present application, can easily think of the change or the replacement, and should all contain
Lid is within the scope of protection of this application.Therefore, the protection scope of the application should be based on the protection scope of the described claims.
Claims (10)
1. a kind of overvoltage crowbar characterized by comprising
Driving chip；
Sampling unit, the sampling end of the sampling unit connect for acquiring load voltage, the signal output end of the sampling unit
Connect the overvoltage protection pin of the driving chip；
Voltage controlled current source unit, the signal that the current feedback input terminal of the voltage controlled current source unit connects the sampling unit are defeated
Outlet；
Start bias unit, for the input terminal of the starting bias unit for acquiring the load open signal, the starting is inclined
The output end for setting unit connects the control voltage input end of the voltage controlled current source unit；
Feedback unit, the input terminal of the feedback unit connect for acquiring the load voltage, the output end of the feedback unit
Connect the control voltage input end of the voltage controlled current source unit.
2. overvoltage crowbar according to claim 1, which is characterized in that the sampling unit includes on concatenated first
Divider resistance and the first lower divider resistance；
Divider resistance connects the load anode, divider resistance on the described first lower divider resistance and described first on described first
One end of connection connects the overvoltage protection pin of the driving chip.
3. overvoltage crowbar according to claim 1, which is characterized in that the feedback unit includes on concatenated second
Divider resistance and the second lower divider resistance；
Divider resistance connects the load anode, divider resistance on the described second lower divider resistance and described second on described second
One end of connection connects the control voltage input end of the voltage controlled current source unit.
4. overvoltage crowbar according to claim 3, which is characterized in that the feedback unit further includes the second capacitor；
Second capacitor is in parallel with the described second lower divider resistance.
5. overvoltage crowbar according to claim 1, which is characterized in that the voltage controlled current source unit includes triode
And the 5th resistance；
The base stage of the triode connect it is described starting bias unit output end and the feedback unit output end, described three
The collector of pole pipe connects the signal output end of the sampling unit, and the emitter of the triode is connect by the 5th resistance
Ground.
6. overvoltage crowbar according to claim 1, which is characterized in that the starting bias unit includes concatenated
One capacitor and diode；
The first capacitor acquires the load open signal, and the diode connects the control electricity of the voltage controlled current source unit
Press input terminal.
7. overvoltage crowbar according to claim 5, which is characterized in that the triode is PNP type triode.
8. a kind of backlight circuit, which is characterized in that including overvoltage crowbar as claimed in any of claims 1 to 7 in one of claims,
The load is back light.
9. a kind of backlight module, which is characterized in that including backlight circuit according to any one of claims 8.
10. a kind of display equipment, which is characterized in that including backlight circuit as claimed in claim 8.
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| CN201920205371.1U CN209419216U (en) | 2019-02-15 | 2019-02-15 | Overvoltage protection circuit, backlight module and display device |
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|---|---|---|---|
| CN201920205371.1U CN209419216U (en) | 2019-02-15 | 2019-02-15 | Overvoltage protection circuit, backlight module and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114115413A (en) * | 2021-08-23 | 2022-03-01 | 珠海极海半导体有限公司 | Power supply protection circuit and power supply management system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114115413A (en) * | 2021-08-23 | 2022-03-01 | 珠海极海半导体有限公司 | Power supply protection circuit and power supply management system |
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