CN205622210U - Display screen with overvoltage protection - Google Patents
Display screen with overvoltage protection Download PDFInfo
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- CN205622210U CN205622210U CN201620337010.9U CN201620337010U CN205622210U CN 205622210 U CN205622210 U CN 205622210U CN 201620337010 U CN201620337010 U CN 201620337010U CN 205622210 U CN205622210 U CN 205622210U
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Abstract
The utility model provides a voltage that display screen with overvoltage protection, including the display screen body and be used for detecting the display screen body to and control display screen body falls electric overvoltage crowbar when the overtension, and overvoltage crowbar includes rectifier module, is coupled in the secondary side of transformer, the sampling module is coupled in rectifier module, voltage stabilizing module, be coupled in the sampling module, voltage stabilizing module including be coupled in the sampling module adjustable linear voltage regulator and be coupled the adjustment module that is used for adjusting adjustable linear voltage regulator's output voltage on adjustable linear voltage regulator, module relatively, be coupled in sampling module and voltage stabilizing module are greater than as sample voltage export high level signal during reference voltage, control module, including in response to the electromagnetic relay of high level signal action, electromagnetic relay including relay coil and in response to the normally closed contact of electromagnetic relay coil disconnection, normally closed contact breaks off control the display screen falls.
Description
Technical field
This utility model relates to a kind of display screen, particularly to a kind of display screen with over-voltage protecting function.
Background technology
Display screen is common electric equipment, often uses in various electric terminals.The life power supply that display screen is external
Voltage typically stable constant at 220V, but due to various external causes, voltage can occur the height of moment in some cases
In the rated voltage within display screen, the high pressure of this moment is likely to display damage.It is particularly applied to athletic ground
In large display screen, its position arranged is generally in stadium, and the voltage of input can than domestic power supply voltage more in power supply
Add shakiness.Thus, how to give the protection circuit that display screen one controls Switching Power Supply pipeline section when input voltage is too high, for
It is the anxious technical issues that need to address for those skilled in the art.
Utility model content
The purpose of this utility model is to provide a kind of display screen with overvoltage protection, disconnects when input voltage is too high
The power supply of display screen, causes internal fault to protect the work of display screen not inputted by unexpected high voltage to be affected.
Above-mentioned purpose of the present utility model has the technical scheme that a kind of showing with overvoltage protection
Display screen, includes display screen body and for detecting the voltage of display screen body, and controls display screen when overtension
The overvoltage crowbar of body power down, described overvoltage crowbar includes
Rectification module, is coupled to the secondary side of transformator, for alternating current is converted to unidirectional current；
Sampling module, is coupled to described rectification module, follows this DC current for producing one according to described DC current
Change and the sampled voltage that changes；
Voltage stabilizing module, is coupled to described sampling module, and for producing a stable reference voltage, described Voltage stabilizing module includes
Have and be coupled to the adjustable linear voltage regulator of described sampling module and be coupled on described adjustable linear voltage regulator for adjusting
State the adjusting module of the output voltage of adjustable linear voltage regulator；
Comparison module, is coupled to described sampling module and Voltage stabilizing module, is used for relatively described reference voltage and sampled voltage,
And high level signal is exported when described sampled voltage is more than described reference voltage；
Control module, includes the electromagnetic relay in response to described high level signal action, described electromagnetic relay bag
Including relay coil and the normally-closed contact disconnected in response to described electromagnetic relay coil, described normally-closed contact disconnects and controlling
Described display screen power down.
By using technique scheme, utilize rectification module that the alternating current of the secondary side of transformator is converted to direct current
Electricity, to meet the use using electrical component thereafter, the sampled voltage of sampling module output, it is reacted in display screen
The sample of voltage levels, by the voltage of this voltage Yu standard, namely display screen required voltage value compares,
Know whether the voltage acting on display screen two ends exceedes limit value；Adjustable linear voltage regulator and adjusting module in Voltage stabilizing module are joined
Close, can make its output voltage clamper in a value limited by adjusting module, to do with sampled voltage as the reference voltage
Relatively；Utilize the comparator in comparison module, the output high level signal when sampled voltage is higher than reference voltage, drive and control mould
Block controls display screen power down.
As preferably, between described comparison module and described control module, it is also coupled to a polar capacitor.
By using technique scheme, polar capacitor is energy-storage travelling wave tube, when comparison module output high level signal, first
First polar capacitor is charged, say, that the voltage of control module gradually rise along with the charging process of polar capacitor and
It not to accept high level signal, then now, when high level output only because what noise in civil power caused quickly, then
The charging interval of polar capacitor can make the startup of control module have certain delay, prevents the mistake power down of display screen.
As preferably, the primary side of described transformator is coupled with a fuse.
By using technique scheme, fuse can fuse when electric current is excessive, protects display screen further.
As preferably, described rectification module is bridge rectifier module.
By using technique scheme, bridge rectifier utilizes the unidirectional general character of diode to carry out rectification, compared to half
Ripple rectification, bridge rectifier obtains sinusoidal wave positive half period, and negative half-cycle then loses, and has the advantages that energy fluctuation is little.
As preferably, described electromagnetic relay coil is also coupled to a fly-wheel diode.
By using technique scheme, electromagnetic relay coil belongs to energy-storage travelling wave tube, and moment loses electric current in circuit
Time, utilize fly-wheel diode to be discharged by the electric energy in electromagnetic relay coil, play the effect of afterflow.
As preferably, described sampling module includes the sampling resistor being coupled to described rectification module, described sampling electricity
Hinder the node output sampled voltage coupled with described rectification module.
By using technique scheme, sampling unit includes sampling resistor, and sampling resistor couples and rectification unit, when
During rectification unit output unidirectional current, through sampling resistor and form a sampled voltage on sampling resistor, at the node coupled
Output.
As preferably, between described rectification module and described sampling module, it is also coupled to filtration module, has been used for filtering off institute
State the harmonic wave in unidirectional current.
By using technique scheme, filtration module, for filtering off the effect of the harmonic wave in primary circuit, prevents harmonic wave pair
This circuit produces interference.
As preferably, described comparison module is also coupled to a power supply display module, has been used for showing that described display screen is originally
The power on/off state of body.
By using technique scheme, utilize the power work state within diode displaying display screen, to carry
Show that display screen is whether because continuous high-pressure and power down.
In sum, this utility model has the advantages that by rectification module, sampling module, Voltage stabilizing module, ratio
Relatively module and control module etc., after the both end voltage of display screen is transformed into unidirectional current, sample, and pass through Voltage stabilizing module
There is provided a stable reference voltage as judging the criterion of sampled voltage height, and finally compare and export high level
Signal control display screen power down or be simultaneously in response to this high level signal start alarm module personnel are warned, effective and simple
Single protects display screen, prevents it from excessive pressure damages occurring.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of embodiment 1；
Fig. 2 is the physical circuit figure of Voltage stabilizing module in embodiment 1；
Fig. 3 is the schematic diagram of embodiment 2；
Fig. 4 is the schematic diagram of embodiment 3.
In figure, 1, rectification module；2, sampling module；3, Voltage stabilizing module；4, comparison module；5, control module；6, filtering mould
Block；7, power supply display module.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described in further detail.
Embodiment 1
A kind of display screen with overvoltage protection, as shown in fig. 1, includes be coupled to successively on display screen body whole
Flow module 1, filtration module 6, sampling module 2, Voltage stabilizing module 3, comparison module 4 and control module 5, rectification module 1 is set to
Bridge rectifier, this bridge rectifier utilizes the unidirectional general character of diode to carry out rectification, compared to halfwave rectifier, bridge-type
Rectification obtains sinusoidal wave positive half period, and negative half-cycle then loses, and has the advantages that energy fluctuation is little, by bridge rectifier electricity
Road is converted into unidirectional current the alternating current being input to electrical equipment, by the filter capacitor C1 of filtration module 6 in unidirectional current
Harmonic wave filter off, and electric capacity C1 use polar capacitor, with in the case of not affecting filter effect reduce cost, prevent harmonic wave pair
Circuit produces interference, and preferably, is also coupled to the electric capacity C2 of secondary filtering between filter capacitor C1 and sampling module 2, with
More thoroughly filter off the harmonic wave in circuit；Sampling tube module 2 includes sampling resistor R1 and R2 of the one end being coupled to electric capacity C2,
And sampling resistor R2 is coupled to the positive input terminal of the comparator in comparison module 4, R2 is a slide rheostat, by adjust its with
Value relatable between R1, adjusts the proportionate relationship between sampled voltage and input voltage；The other end of secondary filtering electric capacity C2
Being coupled in Voltage stabilizing module 3, Voltage stabilizing module 3 includes circuit structure as shown in Figure 2, including adjustable linear voltage regulator and
Adjusting module, wherein: the DC voltage input LM317T chip of secondary filtering electric capacity C2 output carries out voltage stabilizing, LM317T's
ADJ mouth is coupled on adjusting module, and its voltage output is coupled to the negative input end of comparator, using by the voltage after voltage stabilizing as
Reference voltage；The outfan of comparator is coupled to be formed, by NPN audion VT1 and electromagnetic relay coil, the control mould that J forms
Block 5, when sampled voltage is higher than reference voltage, the outfan of comparator exports high level signal to VT1, makes VT1 turn on, this
Time, audion VT1 do switching component use, when audion VT1 turn on, with audion VT1 launch collect couple relay
Device coil obtains electric work, and relay also includes a relay normally-closed contact, and this relay normally-closed contact is coupled in display screen
Power pack, when relay coil obtains electric work, relay normally-closed contact disconnects and makes display screen power down.
As preferably, between the emitting stage and Voltage stabilizing module 3 of audion VT1, it is also coupled to a fly-wheel diode, has used
The electric energy stored in electromagnetic relay coil J is discharged when power-off in circuit.
Embodiment 2
As shown in Figure 3, include embodiment 1, only difference is that: the resistance R2 of sampling module 2 is used instead fixing
The resistance of resistance, and in order to adjust the minimum voltage value of power down, R4 is become the form of slide rheostat, by adjusting the resistance of R4
Value, adjusts the height of reference voltage, thus the high level signal output to power down is controlled opportunity.
Embodiment 3
As shown in Figure 3, including embodiment 1 or embodiment 2, and couple one between the outfan and R6 of comparator
Polar capacitor C3, so, when comparator output high level signal, first polar capacitor C3 is charged, after it charges
After voltage reaches the conducting voltage of VT1, VT1 just can turn on, and so arranges down, when entering the high voltage of moment in display,
Comparator can export high level signal, but, when this high level signal makes control module corresponding to it, is decided by polarity electricity
Holding C3, therefore, when noise during high pressure is power supply, polar capacitor C3 can delay the power down process of display screen, only when this
Persistence during individual high voltage, just can be judged as being harmful to, need power down to protect display screen, the most just can be by control module
5 control display screen power down.
This specific embodiment is only that it is not to restriction of the present utility model, ability to explanation of the present utility model
The present embodiment can be made after reading this specification by field technique personnel as required does not has the amendment of creative contribution, but
As long as all being protected by Patent Law in right of the present utility model.
Claims (8)
1., with a display screen for overvoltage protection, include display screen body and for detecting the voltage of display screen body,
And when overtension control display screen body power down overvoltage crowbar, it is characterized in that: described overvoltage crowbar bag
Include
Rectification module, is coupled to the secondary side of transformator, for alternating current is converted to unidirectional current；
Sampling module, is coupled to described rectification module, for producing a change following this DC current according to described DC current
The sampled voltage changed and change；
Voltage stabilizing module, is coupled to described sampling module, and for producing a stable reference voltage, described Voltage stabilizing module includes coupling
Be connected to the adjustable linear voltage regulator of described sampling module and be coupled on described adjustable linear voltage regulator for adjust described can
Adjust the adjusting module of the output voltage of linear voltage regulator；
Comparison module, is coupled to described sampling module and Voltage stabilizing module, is used for relatively described reference voltage and sampled voltage, and works as
Described sampled voltage is more than output high level signal during described reference voltage；
Control module, includes the electromagnetic relay in response to described high level signal action, and described electromagnetic relay includes
Relay coil and the normally-closed contact disconnected in response to described electromagnetic relay coil, it is described that described normally-closed contact disconnects control
Display screen power down.
Display screen with overvoltage protection the most according to claim 1, is characterized in that: described comparison module and described control
A polar capacitor it has been also coupled between module.
Display screen with overvoltage protection the most according to claim 1, is characterized in that: the primary side of described transformator couples
There is a fuse.
Display screen with overvoltage protection the most according to claim 1, is characterized in that: described rectification module is that bridge-type is whole
Flow module.
Display screen with overvoltage protection the most according to claim 1, is characterized in that: on described electromagnetic relay coil also
It is coupled with a fly-wheel diode.
Display screen with overvoltage protection the most according to claim 1, is characterized in that: described sampling module includes coupling
It is connected to the sampling resistor of described rectification module, the node output sampled voltage that described sampling resistor and described rectification module couple.
Display screen with overvoltage protection the most according to claim 1, is characterized in that: described rectification module and described sampling
Filtration module it has been also coupled to, for filtering off the harmonic wave in described unidirectional current between module.
Display screen with overvoltage protection the most according to claim 1, is characterized in that: be also coupled on described comparison module
One power supply display module, for showing the power on/off state of described display screen body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620337010.9U CN205622210U (en) | 2016-04-20 | 2016-04-20 | Display screen with overvoltage protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620337010.9U CN205622210U (en) | 2016-04-20 | 2016-04-20 | Display screen with overvoltage protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205622210U true CN205622210U (en) | 2016-10-05 |
Family
ID=57027900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620337010.9U Active CN205622210U (en) | 2016-04-20 | 2016-04-20 | Display screen with overvoltage protection |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459218A (en) * | 2018-02-05 | 2018-08-28 | 天地融电子（天津）有限公司 | A kind of test circuit |
| WO2018153000A1 (en) * | 2017-02-22 | 2018-08-30 | 中领世能（天津）科技有限公司 | Over-voltage protection apparatus and power supply system |
| CN109142899A (en) * | 2018-09-19 | 2019-01-04 | 武汉中原电子信息有限公司 | A kind of three-phase load identifying system |
| CN110544453A (en) * | 2019-09-03 | 2019-12-06 | 青岛海信电器股份有限公司 | Display device |
| CN111525161A (en) * | 2020-04-10 | 2020-08-11 | 荷氢新能源科技(山东)有限公司 | Fuel cell capable of automatically controlling hydrogen amount |
-
2016
- 2016-04-20 CN CN201620337010.9U patent/CN205622210U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018153000A1 (en) * | 2017-02-22 | 2018-08-30 | 中领世能（天津）科技有限公司 | Over-voltage protection apparatus and power supply system |
| CN108459218A (en) * | 2018-02-05 | 2018-08-28 | 天地融电子（天津）有限公司 | A kind of test circuit |
| CN108459218B (en) * | 2018-02-05 | 2021-05-14 | 天地融电子（天津）有限公司 | Test circuit |
| CN109142899A (en) * | 2018-09-19 | 2019-01-04 | 武汉中原电子信息有限公司 | A kind of three-phase load identifying system |
| CN110544453A (en) * | 2019-09-03 | 2019-12-06 | 青岛海信电器股份有限公司 | Display device |
| CN111525161A (en) * | 2020-04-10 | 2020-08-11 | 荷氢新能源科技(山东)有限公司 | Fuel cell capable of automatically controlling hydrogen amount |
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| GR01 | Patent grant |