CN206922420U - A kind of over-and under-voltage protection circuit - Google Patents
A kind of over-and under-voltage protection circuit Download PDFInfo
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- CN206922420U CN206922420U CN201720528855.0U CN201720528855U CN206922420U CN 206922420 U CN206922420 U CN 206922420U CN 201720528855 U CN201720528855 U CN 201720528855U CN 206922420 U CN206922420 U CN 206922420U
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- 238000001514 detection method Methods 0.000 claims abstract description 69
- 239000003381 stabilizer Substances 0.000 claims description 52
- 239000004065 semiconductor Substances 0.000 claims description 12
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- 239000004973 liquid crystal related substance Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
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Abstract
The utility model discloses a kind of over-and under-voltage protection circuit, including under-voltage detection module, over-pressed detection module and switch control module；Under-voltage detection module includes being used to be connected to the under-voltage test side of input power and under-voltage signal output part；Over-pressed detection module includes over-pressed test side and over-pressed signal output part；Switch control module includes feeder ear, under-voltage signal input part, over-pressed signal input part and control signal output；Under-voltage signal output part connects under-voltage signal input part and over-pressed test side respectively, and over-pressed signal output part is connected with over-pressed signal input part.Under-voltage detection module of the present utility model and over-pressed detection module detect to input voltage; and the signal detected is sent to switch control module; switch control module is after under-voltage signal or over-pressed signal is received; control backlight drive circuit is stopped; so as to realize backlight drive circuit overvoltage and under-voltage protection, the stability and reliability of backlight drive are improved.
Description
Technical field
It the utility model is related to electronic technology field, more particularly to a kind of over-and under-voltage protection circuit.
Background technology
Liquid crystal display device is widely used because having many merits such as thin fuselage, power saving, radiationless.It is existing
It is backlight liquid crystal display device that the liquid crystal display device of in the market is most of.In backlight liquid crystal display device, liquid crystal panel
Itself do not light, LED backlight is oppositely arranged to liquid crystal display panel to come just for providing display light source with liquid crystal display panel
Often display image, wherein, LED backlight includes at least one LED string.
In LCD TV, the voltage of power panel output can not directly drive LED backlight, it is therefore desirable to a booster circuit
The relatively low direct current that power panel exports is converted into the power supply needed for LED backlight startup and normal work.But in liquid crystal
In the non-isolated boost type backlight drive circuit of TV, when input voltage is too low, because step-up ratio is excessive, backlight circuit can be caused
Job insecurity, and when input voltage is too high, backlight glimmer can be caused again.
Utility model content
Technical problem to be solved in the utility model is, there is provided a kind of over-and under-voltage protection circuit, can realize the back of the body
Light drive circuit overvoltage and under-voltage protection, improve the stability and reliability of backlight drive circuit.
In order to solve the above-mentioned technical problem, the utility model provides a kind of over-and under-voltage protection circuit, including under-voltage inspection
Survey module, over-pressed detection module and switch control module；
The under-voltage detection module includes being used to be connected to the under-voltage test side of input power and under-voltage signal output part；
The over-pressed detection module includes over-pressed test side and over-pressed signal output part；
The switch control module includes being used for the feeder ear, under-voltage signal input part, overvoltage letter for being connected to input power
Number input and control signal output；
The under-voltage signal output part connects the under-voltage signal input part and the over-pressed test side, the overvoltage respectively
Signal output part is connected with the over-pressed signal input part.
Further, the under-voltage detection module includes the first voltage-stabiliser tube；
The negative pole of first voltage-stabiliser tube is connected with the under-voltage test side, and the positive pole of first voltage-stabiliser tube is owed with described
Press signal output part connection.
Further, the over-pressed detection module includes the second voltage-stabiliser tube；
The negative pole of second voltage-stabiliser tube is connected with the over-pressed test side, positive pole and the mistake of second voltage-stabiliser tube
Press signal output part connection.
Further, the switch control module includes first switch pipe, second switch pipe, the 3rd switching tube, the first electricity
Resistance, second resistance and 3rd resistor；
The first end of the first switch pipe is connected with the feeder ear, the second end and the control of the first switch pipe
Signal output part processed connection, the control terminal of the first switch pipe pass through the first resistor and the first switch pipe first
End connection, the first end of the control terminal of the first switch pipe also with the second switch pipe are connected, the second switch pipe
Second end is grounded, and the control terminal of the second switch pipe is connected by the second resistance with the under-voltage signal input part, institute
State first end of the control terminal of second switch pipe also with the 3rd switching tube to be connected, the control terminal of the 3rd switching tube passes through
The 3rd resistor is connected with the over-pressed signal input part, the second end ground connection of the 3rd switching tube.
Preferably, the first switch pipe is P-channel metal-oxide-semiconductor, and the source electrode of the P-channel metal-oxide-semiconductor is the first switch
The first end of pipe, the P-channel metal-oxide-semiconductor drain as the second end of the first switch pipe, the grid of the P-channel metal-oxide-semiconductor
For the control terminal of the first switch pipe.
Preferably, the second switch pipe is NPN type triode, the current collection extremely described second of the NPN type triode
The first end of switching tube, the second end of the extremely described second switch pipe of transmitting of the NPN type triode, the pole of NPN type three
The base stage of pipe is the control terminal of the second switch pipe；
3rd switching tube is NPN type triode, extremely described 3rd switching tube of current collection of the NPN type triode
First end, the second end of extremely described 3rd switching tube of transmitting of the NPN type triode, the base stage of the NPN type triode
For the control terminal of the 3rd switching tube.
Over-and under-voltage protection circuit provided by the utility model, under-voltage detection module detect to input supply voltage,
When detecting that input supply voltage is under-voltage, under-voltage detection module sends under-voltage signal by under-voltage signal output part and controlled to switch
Molding block and over-pressed detection module, after switch control module receives the under-voltage signal, control signal is sent to control backlight drive
Circuit is stopped, and over-pressed detection module no longer carries out detection work after receiving the under-voltage signal；When over-pressed detection module is not received
To under-voltage detection module send under-voltage signal when, then carry out over-pressed detection, when detecting input supply voltage overvoltage, overvoltage
Detection module sends over-pressed signal to switch control module by over-pressed signal output part, and switch control module receives overvoltage letter
After number, control signal is sent to control backlight drive circuit to be stopped, so as to realize the over-pressed and under-voltage guarantor of backlight drive circuit
Shield, improve the stability and reliability of backlight drive.
Brief description of the drawings
Fig. 1 is a kind of circuit block diagram of over-and under-voltage protection circuit provided by the utility model；
Fig. 2 is a kind of circuit theory diagrams of one embodiment of over-and under-voltage protection circuit provided by the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
It is a kind of circuit block diagram of over-and under-voltage protection circuit provided by the utility model referring to Fig. 1.
The utility model embodiment provides a kind of over-and under-voltage protection circuit, including under-voltage detection module 1, overvoltage detection mould
Block 2 and switch control module 3；
The under-voltage detection module 1 includes being used to be connected to the under-voltage test side ud of input power and under-voltage signal output part
uv；
The over-pressed detection module 2 includes over-pressed test side od and over-pressed signal output part ov；
The switch control module 3 include being used for being connected to the feeder ear Vin of input power, under-voltage signal input part v1,
Over-pressed signal input part v2 and control signal output Ctr；
The under-voltage signal output part uv connects under-voltage signal input part ud and over-pressed test side od, the overvoltage letter respectively
Number output end ov is connected with over-pressed signal input part v2.
In the specific implementation, under-voltage detection module 1 is detected by under-voltage test side ud to input supply voltage, works as inspection
Measure input supply voltage it is under-voltage when, under-voltage detection module 1 by under-voltage signal output part uv by the under-voltage signal detected send out
The under-voltage signal input part v1 of switch control module 3 is delivered to, after switch control module 3 receives the under-voltage signal, sends control letter
Number backlight drive circuit is controlled to be stopped, under-voltage detection module 1 simultaneously sends under-voltage signal to over-pressed detection module 2
Over-pressed test side od, over-pressed detection module 2 stop overvoltage detection work after receiving the under-voltage signal；When over-pressed detection module 2 not
When receiving the under-voltage signal that under-voltage detection module 1 is sent, over-pressed detection module 2 detects to input supply voltage, works as detection
To during input supply voltage overvoltage, over-pressed detection module 2 is sent the over-pressed signal detected by over-pressed signal output part ov
To the over-pressed signal input part v2 of switch control module 3, after switch control module 3 receives the over-pressed signal, control signal is sent
To control backlight drive circuit to be stopped, so as to realize backlight drive circuit overvoltage and under-voltage protection, backlight drive is improved
Stability and reliability.Wherein, the under-voltage test side ud of under-voltage detection module 1 connects with the feeder ear Vin of switch control module 3
To same input power, it is not required to individually power.
It is a kind of circuit theory of one embodiment of over-and under-voltage protection circuit provided by the utility model referring to Fig. 2
Figure.As shown in Fig. 2 the under-voltage detection module 1 includes the first voltage-stabiliser tube Z1；
The negative pole of the first voltage-stabiliser tube Z1 is connected with under-voltage test side ud, the positive pole of the first voltage-stabiliser tube Z1 with it is under-voltage
Signal output part uv connections.
The course of work of wherein under-voltage detection module 1 is as follows：When input supply voltage is too low, due to input supply voltage
The first voltage-stabiliser tube Z1 voltage stabilizing value, the first voltage-stabiliser tube Z1 cut-offs are not reached, under-voltage detection module 1 passes through under-voltage signal output part uv
Under-voltage signal is exported, wherein, the threshold value of under-voltage protection is used as using the first voltage-stabiliser tube Z1 voltage stabilizing value.
Further, the over-pressed detection module 2 includes the second voltage-stabiliser tube Z2；
The negative pole of the second voltage-stabiliser tube Z2 is connected with over-pressed test side od, positive pole and the overvoltage of the second voltage-stabiliser tube Z2
Signal output part ov connections.
The course of work of wherein over-pressed detection module 2 is as follows：Sent out when over-pressed detection module 2 does not receive under-voltage detection module 1
During the under-voltage signal sent, i.e., input supply voltage is more than the first voltage-stabiliser tube Z1 voltage stabilizing value, when the first voltage-stabiliser tube Z1 is turned on, overvoltage
Detection module 2 detects to input supply voltage, when input voltage is too high, more than the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube Z2
Voltage stabilizing value summation when, the second voltage-stabiliser tube Z2 conductings, over-pressed detection module 2 believed by over-pressed signal output part ov output overvoltages
Number, wherein, the threshold value of overvoltage protection is used as using the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube Z2 voltage stabilizing value summation.
It should be noted that：Using the first voltage-stabiliser tube Z1 voltage stabilizing value as the threshold value of under-voltage protection, with the first voltage-stabiliser tube
Threshold value of Z1 and the second voltage-stabiliser tube Z2 the voltage stabilizing value summation as overvoltage protection, using the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube
Z2 connects to realize the under-voltage and over-pressed detection to input supply voltage, and circuit structure is simple, and reduces making for high voltage stabilizing pipe
With reducing cost.
Further, the switch control module 3 include first switch pipe Q1, second switch pipe Q2, the 3rd switching tube Q3,
First resistor R1, second resistance R2 and 3rd resistor R3；
The first end of the first switch pipe Q1 is connected with feeder ear Vin, the second end and the control of the first switch pipe Q1
Signal output part Ctr connections processed, the control terminal of the first switch pipe Q1 pass through first resistor R1 and first switch pipe Q1 the
One end is connected, and the first end of the control terminal of the first switch pipe Q1 also with second switch pipe Q2 is connected, the second switch pipe
Q2 the second end ground connection, the control terminal of the second switch pipe Q2 are connected by second resistance R2 with under-voltage signal input part v1,
First end of the control terminal of the second switch pipe Q2 also with the 3rd switching tube Q3 is connected, the control terminal of the 3rd switching tube Q3
It is connected by 3rd resistor R3 with over-pressed signal input part v2, the second end ground connection of the 3rd switching tube Q3.
The course of work of wherein switch control module 3 is as follows：Sent when switch control module 3 receives under-voltage detection module 1
Under-voltage signal when, i.e. the first voltage-stabiliser tube Z1 end when, second switch pipe Q2 control terminal no current passes through second switch pipe Q2
Cut-off, first switch pipe Q1 control terminal is high level, and first switch pipe Q1 ends, the output control signal of switch control module 3
To control backlight drive circuit to be stopped；When switch control module 3 receives the over-pressed signal that over-pressed detection module 2 is sent,
That is the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube Z2 are both turned on, the 3rd switching tube Q3 conductings, second switch pipe Q2 cut-offs, first switch
Pipe Q1 control terminal is high level, first switch pipe Q1 cut-offs, and the output control signal of switch control module 3 controls backlight drive
Circuit is stopped；When switch control module 3, which does not receive under-voltage signal, does not receive over-pressed signal yet, i.e., the first voltage-stabiliser tube Z1 is led
It is logical, when the second voltage-stabiliser tube Z2 ends, the 3rd switching tube Q3 cut-offs, second switch pipe Q2 conductings, first switch pipe Q1 control terminal
For low level, first switch pipe Q1 conductings, backlight drive circuit normal work.
It should be noted that：Second resistance R2 and 3rd resistor R3 is current-limiting resistance.
Preferably, the first switch pipe Q1 is P-channel metal-oxide-semiconductor, and the source electrode of the P-channel metal-oxide-semiconductor is opened for described first
Pipe Q1 first end is closed, the P-channel metal-oxide-semiconductor drains as the second end of the first switch pipe Q1, the P-channel metal-oxide-semiconductor
Grid be the first switch pipe Q1 control terminal.
Preferably, the second switch pipe Q2 is NPN type triode, the current collection extremely described of the NPN type triode
Two switching tube Q2 first end, the extremely described second switch pipe Q2 of transmitting of the NPN type triode the second end, the NPN
The base stage of type triode is the control terminal of the second switch pipe Q2；
The 3rd switching tube Q3 is NPN type triode, extremely described 3rd switching tube of current collection of the NPN type triode
Q3 first end, the extremely described 3rd switching tube Q3 of transmitting of the NPN type triode the second end, the NPN type triode
Base stage be the 3rd switching tube Q3 control terminal.
In the specific implementation, when input supply voltage is too low, because input supply voltage does not reach the first voltage-stabiliser tube Z1
Voltage stabilizing value, the first voltage-stabiliser tube Z1 cut-offs, under-voltage detection module 1 exports under-voltage signal by under-voltage signal output part uv, when opening
When closing control module 3 and receiving the under-voltage signal that under-voltage detection module 1 is sent, second switch pipe Q2 control terminal no current by,
Second switch pipe Q2 ends, and first switch pipe Q1 control terminal is high level, and first switch pipe Q1 ends, switch control module 3
Output control signal controls the backlight drive circuit to be stopped；Sent when over-pressed detection module 2 does not receive under-voltage detection module 1
Under-voltage signal when, i.e., input supply voltage be more than the first voltage-stabiliser tube Z1 voltage stabilizing value, the first voltage-stabiliser tube Z1 turn on when, overvoltage inspection
Survey module 2 to detect input supply voltage, when input supply voltage is too high, more than the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube
During Z2 voltage stabilizing value summation, the second voltage-stabiliser tube Z2 conductings, over-pressed detection module 2 is believed by over-pressed signal output part ov output overvoltages
Number, when switch control module 3 receives the over-pressed signal that over-pressed detection module 2 is sent, the 3rd switching tube Q3 conductings, second switch
Pipe Q2 ends, and first switch pipe Q1 control terminal is high level, and first switch pipe Q1 ends, the output control of switch control module 3
Signal controls the backlight drive circuit to be stopped；Over-pressed signal is not received yet when switch control module 3 does not receive under-voltage signal
When, i.e., input supply voltage is more than the first voltage-stabiliser tube Z1 voltage stabilizing value and is less than the steady of the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube Z2
Pressure value summation, the first voltage-stabiliser tube Z1 conductings, when the second voltage-stabiliser tube Z2 ends, the 3rd switching tube Q3 cut-offs, second switch pipe Q2 is led
Logical, first switch pipe Q1 control terminal is low level, and first switch pipe Q1 is turned on, backlight drive circuit normal work, so as to real
Existing backlight drive circuit overvoltage and under-voltage protection, improve the stability and reliability of backlight drive.Wherein, by with the first voltage stabilizing
Threshold value of the pipe Z1 voltage stabilizing value as under-voltage protection, using the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube Z2 voltage stabilizing value summation as
The threshold value of overvoltage protection, realized using the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube Z2 series connection to the under-voltage of input supply voltage
Detected with overvoltage, circuit structure is simple, and reduces the use of high voltage stabilizing pipe, reduces cost.
It should be noted that in the over-and under-voltage protection circuit that above-described embodiment provides, first switch pipe Q1 is P-channel
Metal-oxide-semiconductor, second switch pipe Q2 and the 3rd switching tube Q3 are NPN type triode, a kind of embodiment only therein, at other
In embodiment, first switch pipe Q1 may be replaced by N-channel MOS pipe or other three ports for control switching devices or it derives from device
Part, second switch pipe Q2 and the 3rd switching tube Q3 may be replaced by PNP type triode or other three ports for control switching devices or
It derives from device, in different application scenarios, depending on the power consumption of actual circuit, cost, driving power and drive with switching tube
Dynamic control element parameter matching etc. requires reasonable selection and setting, and selection and setting switching tube are the conventional design mistakes of prior art
Journey, herein without repeating.
Over-and under-voltage protection circuit provided by the utility model, under-voltage detection module detect to input supply voltage,
When detecting that input supply voltage is under-voltage, under-voltage detection module sends under-voltage signal by under-voltage signal output part and controlled to switch
Molding block and over-pressed detection module, after switch control module receives the under-voltage signal, control signal is sent to control backlight drive
Circuit is stopped, and over-pressed detection module no longer carries out detection work after receiving the under-voltage signal；When over-pressed detection module is not received
To under-voltage detection module send under-voltage signal when, then carry out over-pressed detection, when detecting input supply voltage overvoltage, overvoltage
Detection module sends over-pressed signal to switch control module by over-pressed signal output part, and switch control module receives overvoltage letter
After number, control signal is sent to control backlight drive circuit to be stopped, so as to realize the over-pressed and under-voltage guarantor of backlight drive circuit
Shield, improve the stability and reliability of backlight drive.
Described above is preferred embodiment of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the scope of protection of the utility model.
Claims (6)
1. a kind of over-and under-voltage protection circuit, it is characterised in that including under-voltage detection module, over-pressed detection module and switch control
Module；
The under-voltage detection module includes being used to be connected to the under-voltage test side of input power and under-voltage signal output part；
The over-pressed detection module includes over-pressed test side and over-pressed signal output part；
The feeder ear, under-voltage signal input part, over-pressed signal that the switch control module includes being used to be connected to input power are defeated
Enter end and control signal output；
The under-voltage signal output part connects the under-voltage signal input part and the over-pressed test side, the over-pressed signal respectively
Output end is connected with the over-pressed signal input part.
2. over-and under-voltage protection circuit as claimed in claim 1, it is characterised in that it is steady that the under-voltage detection module includes first
Pressure pipe；
The negative pole of first voltage-stabiliser tube is connected with the under-voltage test side, the positive pole of first voltage-stabiliser tube and the under-voltage letter
The connection of number output end.
3. over-and under-voltage protection circuit as claimed in claim 1, it is characterised in that it is steady that the over-pressed detection module includes second
Pressure pipe；
The negative pole of second voltage-stabiliser tube is connected with the over-pressed test side, and the positive pole of second voltage-stabiliser tube is believed with the overvoltage
The connection of number output end.
4. over-and under-voltage protection circuit as claimed in claim 1, it is characterised in that the switch control module is opened including first
Guan Guan, second switch pipe, the 3rd switching tube, first resistor, second resistance and 3rd resistor；
The first end of the first switch pipe is connected with the feeder ear, and the second end of the first switch pipe is believed with the control
The connection of number output end, the control terminal of the first switch pipe passes through the first resistor and the first end of the first switch pipe connects
Connecing, the first end of the control terminal of the first switch pipe also with the second switch pipe is connected, and the second of the second switch pipe
End ground connection, the control terminal of the second switch pipe is connected by the second resistance with the under-voltage signal input part, and described the
First end of the control terminal of two switching tubes also with the 3rd switching tube is connected, and the control terminal of the 3rd switching tube passes through described
3rd resistor is connected with the over-pressed signal input part, the second end ground connection of the 3rd switching tube.
5. over-and under-voltage protection circuit as claimed in claim 4, it is characterised in that the first switch pipe is P-channel MOS
Pipe, the source electrode of the P-channel metal-oxide-semiconductor are the first end of the first switch pipe, and the drain electrode of the P-channel metal-oxide-semiconductor is described the
Second end of one switching tube, the grid of the P-channel metal-oxide-semiconductor are the control terminal of the first switch pipe.
6. over-and under-voltage protection circuit as claimed in claim 4, it is characterised in that the second switch pipe is the pole of NPN type three
Pipe, the first end of the extremely described second switch pipe of current collection of the NPN type triode, the transmitting of the NPN type triode is extremely
Second end of the second switch pipe, the base stage of the NPN type triode are the control terminal of the second switch pipe；
3rd switching tube is NPN type triode, the first of extremely described 3rd switching tube of current collection of the NPN type triode
End, the second end of extremely described 3rd switching tube of transmitting of the NPN type triode, the base stage of the NPN type triode is institute
State the control terminal of the 3rd switching tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720528855.0U CN206922420U (en) | 2017-05-12 | 2017-05-12 | A kind of over-and under-voltage protection circuit |
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| CN201720528855.0U CN206922420U (en) | 2017-05-12 | 2017-05-12 | A kind of over-and under-voltage protection circuit |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832806A (en) * | 2018-07-04 | 2018-11-16 | 无锡硅动力微电子股份有限公司 | Switching Power Supply control unit and the circuit detected with the control of high voltage startup time and line voltage |
| CN109342973A (en) * | 2018-11-19 | 2019-02-15 | 中车大连电力牵引研发中心有限公司 | DC supply input status monitoring circuit and system |
| CN111071046A (en) * | 2019-11-18 | 2020-04-28 | 深圳市元征科技股份有限公司 | High-low voltage detection circuit |
| CN112653115A (en) * | 2020-12-18 | 2021-04-13 | 同方电子科技有限公司 | Multi-module parallel input circuit for preventing reverse connection, overvoltage and undervoltage protection and isolating switch |
| CN112993953A (en) * | 2021-02-26 | 2021-06-18 | 西安微电子技术研究所 | High-voltage surge suppression circuit |
| CN113300331A (en) * | 2021-06-01 | 2021-08-24 | 中车大连电力牵引研发中心有限公司 | Power supply board card with voltage monitoring function |
| CN113396453A (en) * | 2019-11-22 | 2021-09-14 | 京东方科技集团股份有限公司 | Backlight control circuit, driving method thereof, backlight module and display device |
| CN113406528A (en) * | 2021-06-23 | 2021-09-17 | 新风光电子科技股份有限公司 | Overvoltage and undervoltage detection circuit for input voltage of switching power supply |
| CN113885636A (en) * | 2021-11-05 | 2022-01-04 | 安徽海勤科技有限公司 | Input voltage range adjustable protection circuit |
| CN114069825A (en) * | 2021-10-28 | 2022-02-18 | 国家电网有限公司 | Multi-output power direct current system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108832806A (en) * | 2018-07-04 | 2018-11-16 | 无锡硅动力微电子股份有限公司 | Switching Power Supply control unit and the circuit detected with the control of high voltage startup time and line voltage |
| CN108832806B (en) * | 2018-07-04 | 2023-11-21 | 无锡硅动力微电子股份有限公司 | Switching power supply control unit and circuit with high-voltage starting time control and line voltage detection |
| CN109342973A (en) * | 2018-11-19 | 2019-02-15 | 中车大连电力牵引研发中心有限公司 | DC supply input status monitoring circuit and system |
| CN111071046A (en) * | 2019-11-18 | 2020-04-28 | 深圳市元征科技股份有限公司 | High-low voltage detection circuit |
| CN113396453A (en) * | 2019-11-22 | 2021-09-14 | 京东方科技集团股份有限公司 | Backlight control circuit, driving method thereof, backlight module and display device |
| CN112653115A (en) * | 2020-12-18 | 2021-04-13 | 同方电子科技有限公司 | Multi-module parallel input circuit for preventing reverse connection, overvoltage and undervoltage protection and isolating switch |
| CN112993953B (en) * | 2021-02-26 | 2023-06-06 | 西安微电子技术研究所 | High-voltage surge suppression circuit |
| CN112993953A (en) * | 2021-02-26 | 2021-06-18 | 西安微电子技术研究所 | High-voltage surge suppression circuit |
| CN113300331A (en) * | 2021-06-01 | 2021-08-24 | 中车大连电力牵引研发中心有限公司 | Power supply board card with voltage monitoring function |
| CN113406528A (en) * | 2021-06-23 | 2021-09-17 | 新风光电子科技股份有限公司 | Overvoltage and undervoltage detection circuit for input voltage of switching power supply |
| CN114069825A (en) * | 2021-10-28 | 2022-02-18 | 国家电网有限公司 | Multi-output power direct current system |
| CN113885636A (en) * | 2021-11-05 | 2022-01-04 | 安徽海勤科技有限公司 | Input voltage range adjustable protection circuit |
| CN113885636B (en) * | 2021-11-05 | 2022-12-20 | 安徽海勤科技有限公司 | Input voltage range adjustable protection circuit |
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