CN105633936B - Surge protection circuit and backlight drive circuit - Google Patents
Surge protection circuit and backlight drive circuit Download PDFInfo
- Publication number
- CN105633936B CN105633936B CN201610069161.5A CN201610069161A CN105633936B CN 105633936 B CN105633936 B CN 105633936B CN 201610069161 A CN201610069161 A CN 201610069161A CN 105633936 B CN105633936 B CN 105633936B
- Authority
- CN
- China
- Prior art keywords
- diode
- transformer
- circuit
- signal output
- surge protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
A kind of surge protection circuit of present invention offer and backlight drive circuit, connection signal output circuit and transformer, the surge protection circuit include：First diode；Wherein, the anode of first diode is connect with the first input end of the first signal output end of signal output apparatus and transformer respectively; the cathode of first diode and the second input terminal of transformer connect; wherein; second input terminal of the first input end of transformer, the first diode and transformer constitutes bleed-off circuit; the surge voltage for the first input end for being happened at transformer is released by the bleed-off circuit, to it is effective, reliably protect signal output apparatus.
Description
Technical field
The present invention relates to circuit engineering more particularly to a kind of surge protection circuits and backlight drive circuit.
Background technology
With the rapid development of science and technology, the audio-visual equipment for life ＆ amusement also constantly updates, therefore, people couple
The requirement of the safety and reliability of electronic equipment is also just higher and higher.
Signal output apparatus can directly be connect with transformer in conventional electronic devices, when electronic device works are occurred frequently in thunder and lightning
Area, when being struck by lightning generation, the surge voltage of generation can act on transformer, to which the signal flowed to and transformer is directly connected to is defeated
Go out circuit so that signal output apparatus damages, and is destroyed so as to cause electronic equipment.
In the prior art, it will usually rely on printed circuit board (the Printed Circuit of personal experience in the electronic device
Board, referred to as：PCB) management and control is carried out in configuration and the cabling arrangement of typesetting, limitation lightning stroke or momentary surges voltage
Access, to realize the function of protection electronic equipment.
Effectively surge voltage is avoided to be destroyed caused by electronic equipment however, cannot achieve using the above method.
Invention content
A kind of surge protection circuit of offer of the embodiment of the present invention and backlight drive circuit, can not have in the prior art to overcome
Effect avoids the problem that surge voltage is destroyed caused by electronic equipment.
First aspect of the embodiment of the present invention provides a kind of surge protection circuit, connection signal output circuit and transformer, institute
Stating surge protection circuit includes：First diode；The anode of first diode respectively with the signal output apparatus
The first input end of one signal output end and the transformer connects, cathode and the transformer of first diode
Second input terminal connects.
The surge protection circuit provided in the present invention, connection signal output circuit and transformer, the surge protection circuit packet
It includes：First diode；Wherein, the anode of the first diode respectively with the first signal output end and transformation of signal output apparatus
The first input end of device connects, and the cathode of the first diode and the second input terminal of transformer connect, wherein the first of transformer
Second input terminal of input terminal, the first diode and transformer constitutes bleed-off circuit so that be happened at transformer first is defeated
Entering the surge voltage at end can be released by the bleed-off circuit, to it is effective, reliably protect signal output apparatus,
And then effective protection electronic equipment.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Some bright embodiments for those of ordinary skill in the art without having to pay creative labor, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 show the circuit system schematic diagram in traditional TV；
Fig. 2 show the realization principle figure of the circuit system in traditional TV；
Fig. 3 show the structural schematic diagram of novel circuit system provided by the invention；
Fig. 4 show the structural schematic diagram one of surge protection circuit provided in an embodiment of the present invention；
Fig. 5 show the structural schematic diagram two of surge protection circuit provided in an embodiment of the present invention；
Fig. 6 show the structural schematic diagram three of surge protection circuit provided in an embodiment of the present invention；
Fig. 7 show the structural schematic diagram four of surge protection circuit provided in an embodiment of the present invention；
Fig. 8 show the structural schematic diagram five of surge protection circuit provided in an embodiment of the present invention；
Fig. 9 show the structural schematic diagram six of surge protection circuit provided in an embodiment of the present invention；
Figure 10 show the realization principle figure of the circuit system in TV provided in an embodiment of the present invention.
Specific implementation mode
Make the reliability of tv product, safety increasingly by the weight of all big enterprises with the competition in fierce market
Depending on how to improve the reliability of electronic product, safety is also that each large manufacturer makes great efforts the direction developed.
Along with the developing of overseas market, the especially market of some thunder and lightning districts occurred frequently, intrinsic rate occurred frequently lightning stroke it is special
Property, certain threat is constituted to the reliability of product, safety.It needs to change the circuit in existing electronic equipment
Into to meet the requirement of lightning stroke.
The present invention illustrates, it is notable that present disclosure can be applied so that electronic equipment is TV as an example
To in any electronic equipment, it is not limited with TV.
Fig. 1 show the circuit system schematic diagram in traditional TV, as shown in Figure 1, the circuit system of traditional TV
Including control chip, driving transformer, prime power circuit, isolating transformer, voltage follower circuit and feedback circuit, wherein
Control chip sends out control signal, and driving transformer is transferred to prime power circuit by the control signal that chip is sent out is controlled, just
The control signal received is carried out DC/DC conversions for one piece by grade power circuit with isolating transformer, and then passes through voltage output electricity
Road will carry out the transformed voltage outputs of DC/DC to required equipment, and feedback circuit therein is negative for being provided for entire circuit
Feedback control signal.
In circuit system in traditional TV, there is no the special circuits for preventing surge voltage, can only rely on individual
Experience carries out management and control in configuration and the cabling arrangement of PCB typesettings, the access of surge voltage is limited, to realize protection work(
Energy.However, since everyone experience is different, different circuits have differences again, lead to different circuit system anti-surge voltages
Ability difference.The effect for accurately controlling surge voltage is cannot achieve, and there are some potential safety problemss.
It is worth noting that, the surge voltage referred in the present invention is referred to due to extraneous or internal cause, circuit system
The moment too high voltages beyond normal working voltage of middle generation, in order to more clearly illustrate the thought of the present invention, the present invention
Embodiment is illustrated by taking the surge voltage for generation of being struck by lightning as an example, but in practical applications, the surge protection circuit in the present invention
It can prevent damage of the surge voltage that any mode generates to circuit.
Specifically, Fig. 2 show the realization principle figure of the circuit system of conventional electronic devices, as shown in Fig. 2, traditional electricity
In the system of road, chip, T1 are driving transformer to N1 in order to control, and V1, V2 are power MOS, and T2, T3 are isolating transformer.Work as circuit
When normal work, the N1 output drive signals in Fig. 2 are to T1, the power circuit for driving V1, V2, T2, T3 to constitute after T1 amplifies,
Then required voltage is exported via T2, T3.When lightning stroke generates surge voltage, which can add to N1 pins by T1
On, it is easy to cause N1 damages.
In view of the above-mentioned problems, the present invention provides a kind of novel circuit system, Fig. 3 show provided by the invention novel
The structural schematic diagram of circuit system increase a surge protection circuit as shown in figure 3, in this new-type circuit system,
Specifically released access with being arranged, when lightning stroke generates surge voltage, the surge protection circuit can guide surge voltage according to
Specific bleed-off circuit walking avoids that device (control chip etc.) need to be protected, surge voltage ability is resisted to be promoted.
Entire surge protection circuit periphery discrete component is seldom in circuit system shown in Fig. 3, is improving resistance surge
The reliability of entire circuit is also improved while voltage capability.
The technical solution of the surge protection circuit in above-mentioned Fig. 3 is described in detail with specifically embodiment below.Under
These specific embodiments of face can be combined with each other, may be in certain embodiments for same or analogous concept or process
It repeats no more.
Fig. 4 show the structural schematic diagram one of surge protection circuit provided in an embodiment of the present invention, as shown in figure 4, this reality
The 13 connection signal output circuit 11 of surge protection circuit and transformer 12, the surge protection circuit 13 for applying example may include：The
One diode 131；
The anode of above-mentioned first diode 131 respectively with the first signal output end 111 of above-mentioned signal output apparatus 11 with
And the first input end 121 of above-mentioned transformer 12 connects, the cathode of above-mentioned first diode 131 and the second of above-mentioned transformer 12
Input terminal 122 connects.
By above-mentioned connection type, it can make the first input end 121, the first diode 131 and change of transformer 12
Second input terminal 122 of depressor 12 constitutes bleed-off circuit.
When being struck by lightning, it is assumed that the surge voltage of generation acts on the first input end 121 of transformer 12, in existing skill
In art surge voltage can be directly inputted by the first input end 121 of transformer 12 signal output apparatus 11 the first signal it is defeated
Outlet 111, so that the first signal output end 111 damage of signal output apparatus 11.And in the present invention, surge voltage meeting
The anode of the first diode 131 is directly inputted by the first input end 121 of transformer 12, then by the first diode 131
Cathode be input to the second input terminal 122 of above-mentioned transformer 12, this bleed-off circuit effective short circuit of formation signal output
First signal output end 111 of circuit 11 so that surge voltage can be inputted by the bleed-off circuit so as to avoid surge voltage
To the first signal output end 111 of signal output apparatus 11, effective protection signal output apparatus 11.
Surge protection circuit provided in this embodiment, connection signal output circuit and transformer, the surge protection circuit packet
It includes：First diode；Wherein, the anode of the first diode respectively with the first signal output end and transformation of signal output apparatus
The first input end of device connects, and the cathode of the first diode and the second input terminal of transformer connect, wherein the first of transformer
Second input terminal of input terminal, the first diode and transformer constitutes bleed-off circuit so that be happened at transformer first is defeated
Entering the surge voltage at end can be released by the bleed-off circuit, to it is effective, reliably protect signal output apparatus.
Further, on the basis of surge protection circuit shown in Fig. 4, in order to further improve surge protection circuit 13
Reliability, as shown in figure 5, above-mentioned surge protection circuit further includes：Second diode 132 and capacitance 135, above-mentioned one or two pole
The cathode of pipe 131 is connect with the second input terminal 122 of above-mentioned transformer 12, specially：
The cathode of above-mentioned first diode 131 is connect with the first end of above-mentioned capacitance 135, the second end of above-mentioned capacitance 135
It is connect with the anode of above-mentioned second diode 132, the cathode of above-mentioned second diode 132 and the second input of above-mentioned transformer 12
122 connection of end.
By above-mentioned connection type, it can make the first input end 121, the first diode 131, capacitance of transformer 12
135, the second input terminal 122 composition circuit of the second diode 132, transformer 12.
When being struck by lightning, it is assumed that the surge voltage of generation acts on the first input end 121 of transformer 12.Entire lets out
The process put is：Surge voltage is directly inputted into the anode of the first diode 131 by the first input end 121 of transformer 12,
Then it is input to the first end of capacitance 135 by the cathode of the first diode 131, and then enters second by the second end of capacitance 135
The anode of diode 132 is finally input to the second input terminal 122 of above-mentioned transformer 12, shape by the cathode of the second diode 132
At this bleed-off circuit in effective short circuit the first signal output end 111 of signal output apparatus 11 so that surge voltage meeting
It is released by the bleed-off circuit, the first signal output end of signal output apparatus 11 is input to so as to avoid surge voltage
111, effective protection signal output apparatus 11.
By the way that two diodes are added in surge protection circuit, even if after the first diode 131 damages, the two or two pole
Pipe 132 can also work normally, to improve the reliability of entire surge protection circuit 13.
Further, on the basis of surge protection circuit shown in Fig. 5, in order to further improve surge protection circuit 13
Reliability, that is, in order to avoid the voltage of signal that signal output apparatus 11 exports can be released by surge protection circuit, such as
Shown in Fig. 6, above-mentioned signal output apparatus 11 further includes the voltage output that clamp voltage is provided for the surge protection circuit 13
End 113, at this point, the cathode of above-mentioned first diode 131 is also connect with voltage output end 113.
Such as：In surge protection circuit shown in Fig. 6, it is assumed that the voltage output end 113 of signal output apparatus 11 it is defeated
It is 12V to go out voltage, then clamp voltage is 12V, the letter that signal output apparatus 11 exports when entire circuit system works normally
Number voltage be less than 12V, therefore when entire circuit system work normally, the voltage of 131 anode of the first diode is less than first
The voltage of 131 cathode of diode is in cut-off state so as to cause the first diode 131, at this time the of signal output apparatus 11
The signal of one signal output end 111 output can be directly entered the first input end 121 of transformer, and the of signal output apparatus 11
One signal output end 111 output signal will not through the invention in surge protection circuit released, and when generate surge
When voltage, since surge voltage is generally instantaneous high pressure, namely it is above the voltage of voltage output end 113, at this time first
The voltage of 131 anode of diode is higher than the voltage of 131 cathode of the first diode, to which the first diode 131 is connected, namely generates
Surge voltage can through the invention in surge protection circuit released.
Circuit as shown in FIG. 6, when entire circuit system works normally, the voltage that voltage output end 113 exports will not
The first diode 131 and the second diode 132 in the surge protection circuit in the present invention are acted on, simultaneously as capacitance 135
It can play the role of logical friendship blocking, so the voltage that voltage output end 113 exports will not be applied to the second diode 132, into
And the voltage that voltage output end 113 exports will not be applied to transformer, to which the surge protection circuit in the present invention does not interfere with
The normal work of entire circuit system.
In practical applications, there are two signal output ends for the tool of general signal output circuit 11, and transformer 12 is defeated with 2
Enter end, it is therefore desirable to be protected to two signal output ends of signal output apparatus 11, at this point, protection shown in Fig. 6
On the basis of circuit, as shown in fig. 7, above-mentioned protection circuit further includes：Third diode 133 and the 4th diode 134,
The second input terminal 122 connection of the anode and above-mentioned transformer 12 of above-mentioned third diode 133, above-mentioned three or two pole
The cathode of pipe 133 is connect with the first end of above-mentioned capacitance 135 and above-mentioned voltage output end 113 respectively；The of above-mentioned capacitance 135
Two ends are connect with the anode of above-mentioned 4th diode 134, the cathode of above-mentioned 4th diode 134 and the first input of transformer 12
121 connection of end；The second signal output end 112 of above-mentioned signal output apparatus 11 and the second input terminal 122 of above-mentioned transformer 12
Connection.
By above-mentioned circuit, in addition to make the first input end 121 of transformer 12, the first diode 131, capacitance 135,
Second diode 132, transformer 12 the second input terminal 122 constitute bleed-off circuit outside, it is also possible that the second of transformer 12
Structure between input terminal 122, third diode 133, capacitance 135, the 4th diode 134 and the first input end 121 of transformer 12
At bleed-off circuit.
When being struck by lightning, if the surge voltage generated acts on the first input end 121 of transformer 12, the side of realization
Formula is identical as the mode of above-described embodiment, and details are not described herein again.
And if the surge voltage generated acts on the second input terminal 122 of transformer 12, surge voltage can pass through transformation
Second input terminal 122 of device 12 is directly inputted into the anode of third diode 133, and then the cathode by third diode 133 is defeated
Enter to the first end of capacitance 135, and then is exported to the anode of the 4th diode 134, finally by the 4th by the second end of capacitance 135
The cathode of diode 134 is input to the first input end 121 of above-mentioned transformer 12, the effective short circuit of this bleed-off circuit of formation
The second signal output end 112 of signal output apparatus 11, and so that surge voltage can be released by the bleed-off circuit, to
Avoid the second signal output end 112 that surge voltage is input to signal output apparatus 11, effective protection signal output apparatus
11。
In the present embodiment, protection can be carried out at the same time to two signal output ends of signal output apparatus 11, improved
Reliability.
In order to avoid the electric current flowing in diode involved in above-mentioned each embodiment is excessive, therefore limit can be also set
Leakage resistance, to reduce the electric current for flowing into diode, on the basis of Fig. 7, as shown in Figure 8：Above-mentioned surge protection circuit 13
Can also include first resistor 136, the anode of above-mentioned first diode 131 passes through above-mentioned first resistor 136 and above-mentioned transformer
12 first input end 121 connects.
Further, on the basis of Fig. 8, as shown in figure 9, above-mentioned surge protection circuit 13 can also include：Second
Resistance 137, the second input terminal that the anode of above-mentioned third diode 133 passes through above-mentioned second resistance 137 and above-mentioned transformer 12
122 connections.
It is worth noting that, the signal output apparatus in Fig. 4 to Fig. 9 can be the control chip in Fig. 1 and Fig. 2.And Fig. 4
Can also be the device with unilateral conduction such as field-effect tube or triode to the diode in Fig. 9.
The embodiment of the present invention also provides a kind of backlight drive circuit, including, power supply circuit and with power supply circuit output end phase
The luminescence component of connection further includes：Signal output apparatus, transformer and if Fig. 4 is to the above-mentioned surge protection of Fig. 8 any embodiments
Circuit, above-mentioned signal output apparatus are connect by above-mentioned surge protection circuit with above-mentioned transformer；The other end of above-mentioned transformer
It is connect with the control terminal of above-mentioned power supply circuit.
Further, Figure 10 show the realization principle figure of the circuit system in TV provided in an embodiment of the present invention,
On the basis of the realization principle figure of circuit system in traditional TV shown in Fig. 2, increase VD3, VD4, VD5, VD6 and
R7, wherein VD3, VD4, VD5, VD6 constitute specific bleed-off circuit, the surge voltage that guiding lightning stroke generates.R7 can then be played
The effect of current limliting further increases the reliability of circuit.When being struck by lightning, if the surge voltage generated is positive pressure, it is assumed that
Surge voltage can be begun through R7 by 4 feet of T1 and pass through VD3 to C1, and 1 foot of T1 is then reached via the negative terminal of C1 to VD6, C2,
To form a circuit, 7 feet of N1 is protected not damaged by the impact of high pressure.If the surge voltage generated is negative
Pressure, it is assumed that surge voltage can pass through VD4 to C1 by C2 by 1 foot of T1, then reach the 4 of T1 via the negative terminal of C1 to VD5, R7
Foot protects 5 feet of N1 not damaged by the impact of surge voltage to form a circuit.In order to ensure circuit just
Often work, the resistance value of R7 at this time can be limited to 10 ohms.
N1 can be substituted using functionally similar arbitrary control chip in this circuit.VD3, VD4, VD5, VD6 can make
It is substituted with any type of diode or functionally similar device.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (5)
1. a kind of surge protection circuit, connection signal output circuit and transformer, which is characterized in that
The surge protection circuit includes：First diode；
The anode of first diode respectively with the first signal output end of the signal output apparatus and the transformer
First input end connection, the cathode of first diode connect with the second input terminal of the transformer；
The surge protection circuit further includes：Second diode and capacitance,
The cathode of first diode is connect with the second input terminal of the transformer, specially：
The cathode of first diode is connect with the first end of the capacitance, the second end of the capacitance and the two or two pole
The anode of pipe connects, and the cathode of second diode is connect with the second input terminal of the transformer；
The signal output apparatus further includes the voltage output end that clamp voltage is provided for the surge protection circuit,
The cathode of first diode is also connect with the voltage output end.
2. surge protection circuit according to claim 1, which is characterized in that the surge protection circuit further includes：Third
Diode and the 4th diode,
The anode of the third diode is connected with the second input terminal of the transformer, the cathode difference of the third diode
It is connect with the first end of the capacitance and the voltage output end；
The second end of the capacitance is connect with the anode of the 4th diode, the cathode of the 4th diode and transformer
First input end connects；
The second signal output end of the signal output apparatus is connect with the second input terminal of the transformer.
3. surge protection circuit according to claim 2, which is characterized in that the surge protection circuit further includes the first electricity
Resistance,
The anode of first diode is connect by the first resistor with the first input end of the transformer.
4. surge protection circuit according to claim 3, which is characterized in that the surge protection circuit further includes the second electricity
Resistance,
The anode of the third diode is connect by the second resistance with the second input terminal of the transformer.
5. a kind of backlight drive circuit, including, power supply circuit and the luminescence component being connected with power supply circuit output end are special
Sign is, further includes：Signal output apparatus, transformer and surge protection circuit according to any one of claims 1-4,
The signal output apparatus is connect by the surge protection circuit with the transformer；
The other end of the transformer is connect with the control terminal of the power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610069161.5A CN105633936B (en) | 2016-02-01 | 2016-02-01 | Surge protection circuit and backlight drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610069161.5A CN105633936B (en) | 2016-02-01 | 2016-02-01 | Surge protection circuit and backlight drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105633936A CN105633936A (en) | 2016-06-01 |
| CN105633936B true CN105633936B (en) | 2018-07-13 |
Family
ID=56048604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610069161.5A Expired - Fee Related CN105633936B (en) | 2016-02-01 | 2016-02-01 | Surge protection circuit and backlight drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105633936B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018010183A1 (en) * | 2016-07-15 | 2018-01-18 | 广东欧珀移动通信有限公司 | Surge protection circuit and mobile terminal |
| CN106099880B (en) * | 2016-07-21 | 2018-06-26 | 中国海洋石油总公司 | A kind of leadage circuit, release chip and NMR logging instrument |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2494575Y (en) * | 2001-01-22 | 2002-06-05 | 四川石油管理局川东钻探公司 | AC circuit clutter removing device for electric driller |
| CN101630838A (en) * | 2009-08-25 | 2010-01-20 | 杭州华三通信技术有限公司 | Difference mode surge protection circuit of net interface and realizing method thereof |
| CN102290804A (en) * | 2010-06-17 | 2011-12-21 | 杭州华三通信技术有限公司 | Ethernet port circuit |
| CN103050096A (en) * | 2013-01-21 | 2013-04-17 | 深圳市华星光电技术有限公司 | Backlight drive circuit overvoltage protection method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2002951888A0 (en) * | 2002-10-08 | 2002-10-24 | Fultec Pty Ltd | A protection device for preventing the flow of undersirable transients |
-
2016
- 2016-02-01 CN CN201610069161.5A patent/CN105633936B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2494575Y (en) * | 2001-01-22 | 2002-06-05 | 四川石油管理局川东钻探公司 | AC circuit clutter removing device for electric driller |
| CN101630838A (en) * | 2009-08-25 | 2010-01-20 | 杭州华三通信技术有限公司 | Difference mode surge protection circuit of net interface and realizing method thereof |
| CN102290804A (en) * | 2010-06-17 | 2011-12-21 | 杭州华三通信技术有限公司 | Ethernet port circuit |
| CN103050096A (en) * | 2013-01-21 | 2013-04-17 | 深圳市华星光电技术有限公司 | Backlight drive circuit overvoltage protection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105633936A (en) | 2016-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106911187B (en) | A kind of Width funtion power control circuit | |
| US10811874B2 (en) | Load switch integrated circuit and electronic device | |
| CN103091526A (en) | Voltage detection circuit | |
| CN105633936B (en) | Surge protection circuit and backlight drive circuit | |
| CN101667727B (en) | Interface electrostatic protection circuit | |
| CN201927998U (en) | Short circuit protection circuit for LED backlight lamp strings | |
| US20160149402A1 (en) | Usb esd protection circuit | |
| CN102856893A (en) | Dynamic active clamping circuit and electronic equipment | |
| CN105740183B (en) | Serial port communication circuit | |
| CN104682371A (en) | Large current direct current anti-reverse polarity circuit using MOS (metal oxide semiconductor) tubes | |
| CN203415942U (en) | Fault signal processing circuit | |
| CN103441486A (en) | Reverse-connection-prevention protective circuit of high current power supply | |
| CN203674686U (en) | Electric leakage monitoring chip of electric leakage protector | |
| CN207603205U (en) | A kind of overvoltage, current foldback circuit | |
| TWI506908B (en) | Transient voltage suppressor | |
| CN102843531A (en) | Drive control circuit and television | |
| CN205724833U (en) | A kind of power supply overvoltage protection circuit | |
| CN202817719U (en) | Multifunctional power supply protection circuit | |
| KR20210045175A (en) | Electronic apparatus | |
| CN110474290A (en) | A kind of protection circuit against input over-voltage that brief and practical can restore automatically | |
| CN204103886U (en) | Power device switch amplifies protective circuit | |
| CN206442112U (en) | Multichannel overvoltage crowbar | |
| CN201682278U (en) | ESD (Electro-Static Discharge) protective circuit and television with same | |
| CN209250234U (en) | Protect circuit | |
| CN105186843A (en) | Protective circuit, feedback unit and backlight drive circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180713 Termination date: 20190201 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |