CN207560239U - Power failure detection reset circuit and liquid crystal television - Google Patents
Power failure detection reset circuit and liquid crystal television Download PDFInfo
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- CN207560239U CN207560239U CN201721147772.3U CN201721147772U CN207560239U CN 207560239 U CN207560239 U CN 207560239U CN 201721147772 U CN201721147772 U CN 201721147772U CN 207560239 U CN207560239 U CN 207560239U
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- 238000001514 detection method Methods 0.000 title claims abstract description 77
- 239000004973 liquid crystal related substance Substances 0.000 title claims description 16
- 238000002955 isolation Methods 0.000 claims description 28
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 10
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 10
- 230000005611 electricity Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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Abstract
The utility model discloses a fall electric detection reset circuit and LCD TV, wherein, this fall electric detection reset circuit includes main control system, reset chip, detection circuitry, buffer circuit and first power end, detection circuitry's power detection end with first power end is connected, detection circuitry's detection signal output with buffer circuit's input is connected, buffer circuit's output with the power end of reset chip is connected, the reset signal output of reset chip with main control system's reset signal input end is connected, makes main control system reset time obtain the guarantee through above-mentioned fall electric detection circuit, can reduce the voltage detection risk simultaneously.
Description
Technical field
The utility model is related to electronic circuit technology fields, and in particular to a kind of detection of power loss reset circuit and liquid crystal electricity
Depending on.
Background technology
Reset circuit be it is a kind of be used for making the circuit arrangement that circuit returns to state, it is general using resistance and capacitance
Combination, further can form reset circuit with reference to triode.The level of reset circuit with the variation of Switching Power Supply VCC and
Variation, when VCC declines are slower, resetting time is also elongated, if there is the situation of power down suddenly, it is possible to will appear reset work
Make abnormal phenomenon, lead to system job insecurity.
As shown in Figure 1, be one of common reset circuit at present, including, master control system, first resistor, second resistance,
The reset terminal of 3rd resistor, triode and power end, the first end of first resistor and master control system connects, and the of first resistor
The collector of two ends and triode connects, and the emitter of triode connect with power end, the base stage of triode and 3rd resistor
Second end, the connection of the first end of second resistance, the first end of 3rd resistor are connect with power end VCC, the second end of second resistance
Ground connection.Master control system is resetted for high level, circuit detection power end VCC voltages, when power end VCC voltages decline and are less than threshold value
When, triode ON triggers system reset, but the system reset time cannot ensure.
As shown in Fig. 2, reset circuit master control system, first resistor, second resistance and the power end, the AD of master control system
The second end of interface and first resistor, the connection of the first end of second resistance, the first end of first resistor are connect with power end VCC,
The second end ground connection of second resistance.The A D interface of master control system directly samples master control system voltage, when the system voltage
Power down and less than threshold value when, triggering software inhouse reset.But there is the detection of high voltage without device isolation in the reset circuit
Risk, and software detection delay is bigger.
Utility model content
The purpose of this utility model is to provide a kind of detection of power loss reset circuit, and detection circuit is combined with reset chip,
The system reset time is made to be protected, while by setting isolation circuit, reduces voltage detecting risk.
For solution more than technical problem, the utility model embodiment provides a kind of detection of power loss reset circuit, including master control
System, reset chip, detection circuit, isolation circuit and the first power end；
The power detecting end of the detection circuit is connect with first power end, and the detection signal of the detection circuit is defeated
Outlet is connect with the input terminal of the isolation circuit；
The output terminal of the isolation circuit is connect with the power end of the reset chip；
The reset signal output terminal of the reset chip is connect with the reset signal input terminal of the master control system.
Preferably, the detection circuit include first resistor and second resistance, the first end of the first resistor with it is described
Power detecting end connects；The second end of the first resistor is connect with the first end of the second resistance, and is connected to the inspection
Survey signal output end；The second end ground connection of the second resistance.
Preferably, the isolation circuit includes the first triode, the second triode, 3rd resistor, the 4th resistance, Yi Ji
Five resistance；The base stage of first triode is connect with the input terminal of the isolation circuit；The collector of first triode
It is connect with the first end of the 3rd resistor, the first end of the 4th resistance；The emitter and second of first triode
Power end connects；The second end ground connection of the 3rd resistor；The base stage of second triode and the second of the 4th resistance
End connection；The collector of second triode is connect with the second end of the 5th resistance, the output terminal of the isolation circuit；
The emitter ground connection of second triode；The first end of 5th resistance is connect with the second source end.
Preferably, the detection of power loss reset circuit further includes the 6th resistance, the first end of the 6th resistance with it is described
The base stage connection of first triode, the second end of the 6th resistance are connect with the reset function control terminal of the master control system.
Preferably, the reset function control terminal is one I/O mouthfuls of the master control system.
Preferably, the detection of power loss reset circuit further includes reduction voltage circuit, the input terminal of the reduction voltage circuit with it is described
First power end connects, and the output terminal of the reduction voltage circuit is connect with the second source end.
Preferably, the voltage of first power end is 12V.
The utility model embodiment also provides a kind of LCD TV, including LCD TV driving plate, liquid crystal display and
Above-mentioned power-fail detection circuit；The power end of the liquid crystal display is connect with first power end；The master control system
Power supply signal output terminal is connect with the power end of the LCD TV driving plate；The drive signal of the LCD TV driving plate is defeated
Outlet is connect with the driving signal input of the liquid crystal display.
Compared with the prior art, a kind of advantageous effect of detection of power loss reset circuit of the utility model embodiment is：
The detection of power loss reset circuit includes master control system, reset chip, detection circuit, isolation circuit and the first power end；Institute
The power detecting end for stating detection circuit is connect with first power end, the detection signal output end of the detection circuit with it is described
The input terminal connection of isolation circuit；The output terminal of the isolation circuit is connect with the power end of the reset chip；The reset
The reset signal output terminal of chip is connect with the reset signal input terminal of the master control system.Made by above-mentioned power-fail detection circuit
It must be protected the master control system reset time, and can realize the effect of the enabled software-controllable of detection.Above-mentioned detection of power loss electricity simultaneously
Road sets isolation circuit, reduces voltage detecting risk.
Description of the drawings
Fig. 1 is the circuit diagram of the reset circuit of the prior art；
Fig. 2 is the circuit diagram of another reset circuit of the prior art；
Fig. 3 is the circuit diagram of a kind of detection of power loss reset circuit that the utility model embodiment is provided.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without creative efforts
All other embodiments obtained shall fall within the protection scope of the present invention.
Referring to Fig. 3, a kind of its detection of power loss reset circuit that be the utility model embodiment provided, including master control system
System 1, reset chip 2, detection circuit 3,4 and first power end VCC1 of isolation circuit, the power detecting end of detection circuit 3 and the
One power end VCC1 connections, the detection signal output end of detection circuit 3 are connect with the input terminal of isolation circuit 4；Isolation circuit 4
Output terminal is connect with the power end Vcc of reset chip 2；The reset signal output terminal Reset of reset chip 2 and master control system 1
The RESET connections of reset signal input terminal, the ground terminal GND ground connection of reset chip 2.
Detection circuit 3 includes first resistor R1 and second resistance R2, the first end of first resistor R1 and the power detecting
End connection；The second end of first resistor R1 is connect with the first end of second resistance R2, and is connected to the detection signal output end；
The second end ground connection of second resistance R2.
Isolation circuit 4 includes the first triode Q1, the second triode Q2,3rd resistor R3, the 4th resistance R4 and the 5th
Resistance R5；The base stage of first triode Q1 is connect with the input terminal of isolation circuit 4, collector and the third electricity of the first triode Q1
First end, the connection of the first end of the 4th resistance R4 of R3 is hindered, the emitter of the first triode Q1 is connect with second source end VCC2；
The second end ground connection of 3rd resistor R3；The base stage of second triode Q2 is connect with the second end of the 4th resistance R4, the second triode
The collector of Q2 is connect with the second end of the 5th resistance R5, the output terminal of isolation circuit 4, and the emitter of the second triode Q2 connects
Ground；The first end of 5th resistance R5 is connect with second source end VCC2.By setting isolation electricity in the power-fail detection circuit
Road 4 can reduce voltage detecting risk.Further, detection of power loss reset circuit further includes the 6th resistance R6, the 6th resistance R6
First end connect with the base stage of the first triode Q1, the second end of the 6th resistance R6 and the reset function of master control system 1 control
End connection.The reset function control terminal is one I/O mouthfuls of master control system.
Further, detection of power loss reset circuit further includes reduction voltage circuit, the input terminal of the reduction voltage circuit and the first electricity
Source VCC1 connections, the output terminal of the reduction voltage circuit are connect with second source end VCC2.The voltage of first power end VCC1 is
12V.Wherein, the voltage of second source end VCC2 is depressured to obtain by the first power end VCC1, i.e. the electricity of second source end VCC2
Voltage of the pressure less than the first power end VCC1, second source end VCC2 are used to power to master control system and carry for reset chip 1
For burning voltage.Preferably, the voltage of the first power end VCC1 is 12V.
By taking high level resets as an example, the reset chip 2 in foregoing circuit is using the chip of high level reset, first resistor R1
The voltage of the first power end VCC1 is detected with second resistance R2, when the circuit works normally, i.e. the first power end VCC1 outputs
Voltage is normal, and the base voltage of the first triode Q1 is more than its collector voltage, the first triode Q1 cut-offs, at this point, the two or three
The base voltage of pole pipe Q2 is less than its collector voltage, and the second triode Q2 ends, so that the power end of reset chip 2
Voltage is the burning voltage that second source end VCC2 is exported after the 5th resistance R5, and reset chip 2 works normally, reset chip 2
Reset signal output terminal output low level, master control system 1 works normally.
When the voltage power down of the first power end VCC1, and during less than activation threshold value, i.e. the base voltage of the first triode Q1
Less than its collector voltage, the first triode Q1 conductings, at this point, the base voltage of the second triode Q2 is less than its collector electricity
Pressure, the second triode Q2 conductings, so that the power supply terminal voltage of reset chip 2 declines, triggering reset, i.e. reset chip 2
The high level signal of the fixed duration of reset signal output terminal output, so that master control system 2 has time enough to be resetted.
In a kind of optional embodiment, when not needing to reset function, the I/O of master control system 1 is set by software
The output voltage of mouth is high level so that the base voltage of the first triode Q1 is more than its collector voltage, the first triode Q1
Cut-off, at this point, the base voltage of the second triode Q2 is less than its collector voltage, the second triode Q2 cut-offs, so that multiple
The burning voltage that the voltage of the power end Vcc of position chip 2 is exported for second source end VCC2 after the 5th resistance R5, reset chip
1 voltage stabilization does not trigger reset, i.e. the reset function of the circuit is closed, and realizes the effect of the enabled software-controllable of detection.
In addition, required according to the reset level of master control system, it can be applicable by replacing the reset chip circuit
In the system that high level resets and low level resets.If master control system is resetted for high level, the core of high level reset may be used
Piece, for example, SGM810 is serial, PT7M7810 family chips；If master control system is resetted for low level, low level reset may be used
Chip, such as SGM809 series, PT7M7809 family chips.
The utility model embodiment also discloses a kind of LCD TV, including LCD TV driving plate, liquid crystal display with
And above-mentioned power-fail detection circuit；The power end of liquid crystal display is connect with the first power end；The power supply signal output of master control system
End is connect with the power end of LCD TV driving plate；The driving signal output end of LCD TV driving plate and the drive of liquid crystal display
Dynamic signal input part connection.
Above-mentioned power-fail detection circuit, which is applied to, can solve the input voltage AC power down liquid crystal of Switching Power Supply in LCD TV
The problem of display is abnormal.The voltage VCC that Switching Power Supply exports in LCD TV is 12V, while is supplied to liquid crystal display and master control system
Electricity, liquid crystal display screen power supply minimum voltage are 10.8V, the minimum 6V of master control system work.When master control system power down is in 6V to 10.8V
Between, liquid crystal display can show exception.Increase above-mentioned power-fail detection circuit, setting detection threshold value is 10.8V.When VCC power down is arrived
10.8V, triggering master control system reset, and the power supply of LCD TV driving plate can be broken, and then be reopened, so as to avoid liquid crystal display
Display is abnormal.
In terms of the super-low standby power consumption of TV, when standby, the voltage VCC of Switching Power Supply output can be reduced, and be less than
Detection of power loss threshold value.At this time with above-mentioned power-fail detection circuit, circuit monitoring power down function is turned off by software, circuit is avoided to touch
Hair resets.
A kind of advantageous effect of detection of power loss reset circuit of the utility model embodiment is：The detection of power loss resets
Circuit includes master control system, reset chip, detection circuit, isolation circuit and the first power end；The power supply of the detection circuit
Test side is connect with first power end, the detection signal output end of the detection circuit and the input terminal of the isolation circuit
Connection；The output terminal of the isolation circuit is connect with the power end of the reset chip；The reset signal of the reset chip is defeated
Outlet is connect with the reset signal input terminal of the master control system.When being resetted by above-mentioned power-fail detection circuit master control system
Between be protected, and can realize the effect of the enabled software-controllable of detection.Above-mentioned power-fail detection circuit setting isolation circuit simultaneously, drop
Low voltage detecting risk.
It is the preferred embodiment of the utility model above, it is noted that for those skilled in the art
For, under the premise of the utility model principle is not departed from, several improvements and modifications can also be made, these improvements and modifications
It is considered as the scope of protection of the utility model.
Claims (8)
1. a kind of detection of power loss reset circuit, which is characterized in that including master control system, reset chip, detection circuit, isolation circuit
And first power end；
The power detecting end of the detection circuit is connect with first power end, the detection signal output end of the detection circuit
It is connect with the input terminal of the isolation circuit；
The output terminal of the isolation circuit is connect with the power end of the reset chip；
The reset signal output terminal of the reset chip is connect with the reset signal input terminal of the master control system.
2. detection of power loss reset circuit as described in claim 1, which is characterized in that the detection circuit include first resistor and
Second resistance, the first end of the first resistor are connect with the power detecting end；The second end of the first resistor with it is described
The first end connection of second resistance, and it is connected to the detection signal output end；The second end ground connection of the second resistance.
3. detection of power loss reset circuit as claimed in claim 1 or 2, which is characterized in that the isolation circuit includes the one or three
Pole pipe, the second triode, 3rd resistor, the 4th resistance and the 5th resistance；The base stage of first triode is isolated with described
The input terminal connection of circuit；The collector of first triode and the first end of the 3rd resistor, the 4th resistance
First end connects；The emitter of first triode is connect with second source end；The second end ground connection of the 3rd resistor；Institute
The base stage for stating the second triode is connect with the second end of the 4th resistance；The collector of second triode and the described 5th
The output terminal connection of the second end of resistance, the isolation circuit；The emitter ground connection of second triode；5th resistance
First end connect with the second source end.
4. detection of power loss reset circuit as claimed in claim 3, which is characterized in that the detection of power loss reset circuit further includes
6th resistance, the first end of the 6th resistance are connect with the base stage of first triode, the second end of the 6th resistance
It is connect with the reset function control terminal of the master control system.
5. detection of power loss reset circuit as claimed in claim 4, which is characterized in that the reset function control terminal is the master
I/O mouthfuls of one of control system.
6. detection of power loss reset circuit as claimed in claim 3, which is characterized in that the detection of power loss reset circuit further includes
Reduction voltage circuit, the input terminal of the reduction voltage circuit are connect with first power end, the output terminal of the reduction voltage circuit with it is described
Second source end connects.
7. detection of power loss reset circuit as described in claim 1, which is characterized in that the voltage of first power end is 12V.
8. a kind of LCD TV, which is characterized in that including LCD TV driving plate, liquid crystal display and such as claim 1~7
Any one of them detection of power loss reset circuit；The power end of the liquid crystal display is connect with first power end；It is described
The power supply signal output terminal of master control system is connect with the power end of the LCD TV driving plate；The LCD TV driving plate
Driving signal output end is connect with the driving signal input of the liquid crystal display.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721147772.3U CN207560239U (en) | 2017-09-07 | 2017-09-07 | Power failure detection reset circuit and liquid crystal television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721147772.3U CN207560239U (en) | 2017-09-07 | 2017-09-07 | Power failure detection reset circuit and liquid crystal television |
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| Publication Number | Publication Date |
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| CN207560239U true CN207560239U (en) | 2018-06-29 |
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| CN201721147772.3U Active CN207560239U (en) | 2017-09-07 | 2017-09-07 | Power failure detection reset circuit and liquid crystal television |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417247A (en) * | 2019-07-12 | 2019-11-05 | 深圳市微风通讯技术有限公司 | Faraday's lightning protection power source protective module |
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2017
- 2017-09-07 CN CN201721147772.3U patent/CN207560239U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417247A (en) * | 2019-07-12 | 2019-11-05 | 深圳市微风通讯技术有限公司 | Faraday's lightning protection power source protective module |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190505 Address after: 510530 3/F 310, 192 Kezhu Road, Guangzhou High-tech Industrial Development Zone, Guangdong Province Patentee after: GUANGZHOU SHIKUN ELECTRONICS Co.,Ltd. Address before: 510530 No. 6, Yun Po four road, Whampoa District, Guangzhou, Guangdong. Patentee before: Guangzhou Shiyuan Electronic Technology Company Limited |
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| TR01 | Transfer of patent right |