CN208423793U - A kind of upper electrical protective device, cabinet and LED display - Google Patents
A kind of upper electrical protective device, cabinet and LED display Download PDFInfo
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- CN208423793U CN208423793U CN201820954424.5U CN201820954424U CN208423793U CN 208423793 U CN208423793 U CN 208423793U CN 201820954424 U CN201820954424 U CN 201820954424U CN 208423793 U CN208423793 U CN 208423793U
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- lamp plate
- connector
- pinboard
- circuit
- protective device
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Abstract
The utility model discloses a kind of upper electrical protective device, cabinet and LED displays, and electrical protective device is used to control lamp plate according to the connection status in the cabinet of LED display between the connector of lamp plate and the connector of pinboard and power on this；Including detection circuit and start-up circuit；Wherein, after the feedback signal that detection circuit normally connects between the connector of the connector and pinboard that are continuously detected characterization lamp plate, it is on circuit, to power by the connector of pinboard to lamp plate.Due to that only in the case where detection circuit persistently receives feedback signal, can determine and normally be connected between lamp plate and pinboard, it is on circuit at this time and powers to lamp plate, lamp plate will not be damaged；Therefore, it avoids and gives lamp plate power supply, effective protection lamp plate under the connector of lamp plate and the connector exception connection of pinboard.
Description
Technical field
The utility model relates to field of display technology more particularly to a kind of upper electrical protective devices, cabinet and LED display.
Background technique
LED display is made of multiple box body splicings, and the current most common cabinet includes lamp plate (i.e. display module), driving
Plate, pinboard and power supply.Wherein, lamp plate and pinboard all have connector, mainly there is power supply signal and driving letter on connector
Number；Power supply is directly driving plate and pinboard power supply, and passes through the connection between the connector of pinboard and the connector of lamp plate,
It powers indirectly to lamp plate；Driving plate is mounted on pinboard, and driving signal is sent to lamp plate by the connector of pinboard
Connector, to realize the control to content is shown on lamp plate.Currently, during being safeguarded to LED display, dismounting
LED display is carried out in the condition of electrification.However, because lamp plate charges, once there is connector mistake in disassembly process
Situations such as position, poor contact or anti-plug, will lead to lamp plate damage, influence the service life of lamp plate.
Utility model content
In view of this, the utility model embodiment provides a kind of upper electrical protective device, cabinet and LED display, to
Lamp plate is avoided to be damaged to a certain extent.
Therefore, a kind of upper electrical protective device provided by the embodiment of the utility model, in the cabinet according to LED display
Connection status between the connector of lamp plate and the connector of pinboard, control lamp plate power on；Electrical protective device can wrap on this
It includes: detection circuit and start-up circuit；Wherein, detection circuit, for detecting between the connector of lamp plate and the connector of pinboard
The feedback for whether normally connecting, and normally being connected between the connector of the connector and pinboard that are continuously detected characterization lamp plate
After signal, it is on circuit, to power by the connector of pinboard to lamp plate.
Due in the case where detection circuit persistently receives feedback signal, can only determine between lamp plate and pinboard just
Often connection is on circuit at this time and powers to lamp plate, will not damage lamp plate；Therefore, connector and the switching of lamp plate are avoided
Lamp plate power supply, effective protection lamp plate are given under the connector exception connection of plate.
Optionally, electrical protective device on this further include: overvoltage crowbar, the input voltage for providing in power supply are more than
When preset threshold, start-up circuit is closed, to stop powering to lamp plate.
In this kind of optional way, the overvoltage protection to lamp plate can be not only realized, can also prevent from dismounting lamp plate in electrification
Moment impact voltage in the process.
Optionally, electrical protective device on this further include: switching circuit, for the control starting electricity under the driving of detection circuit
Road opens or closes.
In this kind of optional way, the output signal that switching circuit will test circuit is converted to having for openable start-up circuit
Signal is imitated, when to avoid normally being connected between lamp plate and pinboard, circuit cannot be normally on and powering to lamp plate.
Optionally, electrical protective device on this further include: switching circuit is opened for controlling under the driving of overvoltage crowbar
Dynamic circuit opens or closes.
In this kind of optional way, switching circuit will close under the action of the output signal of overvoltage crowbar, to avoid
When overtension, it is on lamp plate damage caused by circuit is powered to lamp plate.
Optionally, electrical protective device on this further include: switching circuit, for the drive in detection circuit and overvoltage crowbar
Dynamic lower control start-up circuit opens or closes.
In this kind of optional way, switching circuit was both converted to openable starting electricity by will test the output signal of circuit
The useful signal on road when to avoid normally connecting between lamp plate and pinboard, cannot normally be on circuit and supply to lamp plate
Electricity；Further through by the lower closing of output signal effect of overvoltage crowbar, when to avoid overtension, circuit is on to lamp
The damage of lamp plate caused by plate is powered.
Optionally, on this in electrical protective device, detection circuit, start-up circuit and overvoltage crowbar with power supply phase
Even.
It a use of power supply is detection circuit, start-up circuit, overvoltage crowbar and switch electricity in this kind of optional way
Road is unified to power, so that upper electrical protective device is relatively simple for structure.
Optionally, detection circuit in electrical protective device on this, comprising: adjustable resistance, first resistor, first capacitor and inspection
Survey chip；Wherein, the first pin of detection chip is connected with the connector of pinboard, and second pin is connected with first node, the
Three pins are connected with second node, the 4th pin ground connection；Adjustable resistance and first resistor are connected between power supply and second node；
One end of first capacitor is connected with second node, other end ground connection.
In this kind of optional way, detection chip be continuously detected characterization lamp plate and pinboard between normally connect it is anti-
Meeting output signal is after feedback signal to be on circuit, and determines start-up circuit by adjustable resistance, first resistor and first capacitor
Opening duration, in the duration be lamp plate power；So as to avoid connection supplies lamp plate extremely between lamp plate and pinboard
Electricity protects lamp plate.
Optionally, overvoltage crowbar in electrical protective device on this, comprising: zener diode, second resistance, third electricity
Resistance and triode；Wherein, the cathode of zener diode is connected with power supply, and anode is connect by concatenated second resistance and 3rd resistor
Ground；Node between the base stage of triode and concatenated second resistance and 3rd resistor is connected, and collector is connected with first node, penetrates
Pole ground connection.
In this kind of optional way, zener diode, second resistance and 3rd resistor determine preset threshold, in power supply
When input voltage is higher than preset threshold, the base voltage of triode is raised, and triode ON simultaneously exports control start-up circuit pass
The signal closed avoids high pressure to the adverse effect of lamp plate to stop powering to lamp plate.
Optionally, switching circuit in electrical protective device on this, comprising: first switch transistor and the 4th resistance；Wherein,
The grid of first switch transistor is connected with first node, and source electrode ground connection, drain electrode is connected by the 4th resistance with third node.
In this kind of optional way, first switch transistor is connected under the control of detection chip output signal, and passes through
Control start-up circuit is opened after the decompression of 4th resistance, to power to lamp plate；It avoids and is normally connected between lamp plate and pinboard
When, it cannot normally be on circuit and power to lamp plate.
In this kind of optional way, first switch transistor can also close under the control of triode output signal, into
And start-up circuit is closed, to stop powering to lamp plate, avoid damage of the high pressure to lamp plate.
In this kind of optional way, first switch transistor can also be connected under the control of detection chip output signal,
And control start-up circuit is opened after being depressured by the 4th resistance, to power to lamp plate；And under the control of triode output signal
It closes, and then closes start-up circuit, to stop powering to lamp plate.Both can normally to connect between lamp plate and pinboard
When, it is on circuit and powers to lamp plate；It can avoid damage of the high pressure to lamp plate again simultaneously.
Optionally, start-up circuit in electrical protective device on this, comprising: second switch transistor；Wherein, second switch is brilliant
The grid of body pipe is connected with third node, and source electrode is connected with power supply, and drain electrode is connected with the connector of pinboard.
In this kind of optional way, second switch transistor is connected under the control of detection chip output signal, to lamp
Plate is powered；So as to avoid connection powers to lamp plate extremely between lamp plate and pinboard, lamp plate is protected.
In this kind of optional way, second switch transistor can also end under the control of triode output signal, with
Stopping is powered lamp plate；Avoid damage of the high pressure to lamp plate.
In this kind of optional way, second switch transistor can also be led under the control of the signal after the decompression of the 4th resistance
It is logical, to be powered to lamp plate；Avoid when normally being connected between lamp plate and pinboard, cannot normally be on circuit to
Lamp plate power supply.
Optionally, start-up circuit in electrical protective device on this, further includes: the 5th resistance, the second capacitor and third capacitor；
Wherein, the 5th resistance and the second capacitor are connected in parallel between power supply and third node；One end of third capacitor is connected with third node,
The other end is connected with the connector of pinboard.
In this kind of optional way, the 5th resistance, the second capacitor and third capacitor are adjusted second switch transistor and open
The dash current of moment prevents damage of the dash current to lamp plate.
Optionally, start-up circuit in electrical protective device on this, further includes: the 4th capacitor and the 5th capacitor；Wherein, the 4th
One end of capacitor is connected with power supply, other end ground connection；One end of 5th capacitor is connected with the connector of pinboard, another termination
Ground.
In this kind of optional way, the 4th capacitor and the 5th capacitor primarily serve filter action, so that second switch is brilliant
Body pipe exports a stable power supply signal.
Conceived based on same utility model, the utility model embodiment additionally provides a kind of cabinet, comprising: there is connector
Lamp plate, the pinboard with connector, the driving plate being set on pinboard and power supply；Wherein, lamp plate and pinboard pass through
The connector of lamp plate and the connector of pinboard are attached；Power supply is lamp plate, pinboard and driving plate power supply；Driving plate passes through
Driving signal is sent to the connector of lamp plate by the connector of pinboard, to realize the control to content is shown on lamp plate；Also wrap
It includes: any of the above-described kind of upper electrical protective device.
Due in the case where detection circuit persistently receives feedback signal, can only determine between lamp plate and pinboard just
Often connection is on circuit at this time and powers to lamp plate, will not damage lamp plate；Therefore, connector and the switching of lamp plate are avoided
Lamp plate power supply, effective protection lamp plate are given under the connector exception connection of plate.
Optionally, the driving plate in the cabinet is also used to the connector load detection signal to pinboard；Feedback signal is
It is loaded onto the connector of pinboard, and is transferred to the connector of lamp plate, then the connector by lamp plate by the connector of pinboard
Connector through pinboard feeds back to the detection signal of detection circuit.
In this kind of optional way, existing driving plate in cabinet is used to provide characterization lamp plate for upper electrical protective device and turn
The feedback signal that fishplate bar normally connects avoids the element for adding offer feedback signal in cabinet, simplifies box house knot
Structure.
Optionally, power supply is also used to as the power supply of upper electrical protective device in the cabinet.
In this kind of optional way, the use of power supply existing in cabinet is the power supply of upper electrical protective device, is powered on without being directed to
Protective device adds power supply, so that box inner structure is as fairly simple as possible.
Optionally, upper electrical protective device is located on pinboard in the cabinet.
In this kind of optional way, upper electrical protective device is located on pinboard, and detection circuit is more easily connect
The connector for being loaded onto pinboard by driving plate is received, and is transferred to the connector of lamp plate by the connector of pinboard, then by lamp
The detection signal that the connector of plate is fed back through the connector of pinboard.
Conceived based on same utility model, the utility model embodiment additionally provides a kind of LED display, comprising: multiple
Any of the above-described kind of cabinet.
The utility model has the beneficial effect that:
In upper electrical protective device provided by the embodiment of the utility model, cabinet and LED display, electrical protective device is used on this
Connection status in the cabinet according to LED display between the connector of lamp plate and the connector of pinboard controls on lamp plate
Electricity；Including detection circuit and start-up circuit；Wherein, detection circuit is in the connector and pinboard for being continuously detected characterization lamp plate
After the feedback signal normally connected between connector, it is on circuit, to power by the connector of pinboard to lamp plate.By
In only in the case where detection circuit persistently receives feedback signal, can determining and normally be connected between lamp plate and pinboard, this
When be on circuit give lamp plate power supply, lamp plate will not be damaged；Therefore, the connector of lamp plate and the connector of pinboard are avoided
Lamp plate power supply, effective protection lamp plate are given under abnormal connection.
Detailed description of the invention
Fig. 1 is one of the structural schematic diagram of upper electrical protective device provided by the embodiment of the utility model；
Fig. 2 a to Fig. 2 c is respectively the concrete structure schematic diagram of upper electrical protective device shown in FIG. 1；
Fig. 3 is the second structural representation of upper electrical protective device provided by the embodiment of the utility model；
Fig. 4 a to Fig. 4 c is respectively the concrete structure schematic diagram of upper electrical protective device shown in Fig. 3；
Fig. 5 is the third structural representation of upper electrical protective device provided by the embodiment of the utility model；
Fig. 6 a to Fig. 6 c is respectively the concrete structure schematic diagram of upper electrical protective device shown in fig. 5；
Fig. 7 is the four of the structural schematic diagram of upper electrical protective device provided by the embodiment of the utility model；
Fig. 8 a to Fig. 8 c is respectively the concrete structure schematic diagram of upper electrical protective device shown in Fig. 7；
Fig. 9 is the structural schematic diagram of cabinet provided by the embodiment of the utility model.
Specific embodiment
With reference to the accompanying drawing, to the tool of upper electrical protective device provided by the embodiment of the utility model, cabinet and LED display
Body embodiment is described in detail.It should be noted that this specification described embodiment is only the utility model one
Section Example, instead of all the embodiments；And in the absence of conflict, in the embodiment and embodiment in the application
Feature can be combined with each other；In addition, based on the embodiments of the present invention, those of ordinary skill in the art are not making
All other embodiment obtained, fall within the protection scope of the utility model under the premise of creative work.
Electrical protective device provided by the embodiment of the utility model on the first, for lamp in the cabinet according to LED display
Connection status between the connector of plate and the connector of pinboard, control lamp plate power on；As shown in Figure 1, this first power on
Protective device, comprising: detection circuit 101 and start-up circuit 102；
Whether detection circuit 101 normally connects between the connector of lamp plate and the connector of pinboard for detecting, and
After being continuously detected the feedback signal normally connected between the connector of characterization lamp plate and the connector of pinboard, it is on electricity
Road 102, to be powered by the connector of pinboard to lamp plate.
Due to that can determine between lamp plate and pinboard in the case where detection circuit 101 persistently receives feedback signal
Normal connection is on circuit 102 at this time and powers to lamp plate, will not damage lamp plate；It is not received persistently in detection circuit 101
In the case where feedback signal, it can determine and be connected extremely between lamp plate and pinboard, close start-up circuit 102 at this time, will not give
Lamp plate power supply, will not damage lamp plate.Therefore, the connector for avoiding lamp plate is misplacing, is contacting not with the connector of pinboard
Lamp plate power supply, effective protection lamp plate are given under the exception connection such as good, anti-plug.
Above-mentioned electrical protective device on the first in order to better understand is carried out below with three possible specific embodiments detailed
It describes in detail bright.
Fig. 2 a show one of possible specific embodiment.As shown in Figure 2 a, detection circuit 101, comprising: adjustable electric
Hinder R, first resistor R1, first capacitor C1 and detection chip IC；Wherein, the company of the first pin 1 and pinboard of detection chip IC
Device (being not shown in Fig. 2 a) is connect to be connected, second pin 2 is connected with first node P1, and third pin 3 is connected with second node P2, the
Four pins ground connection；Adjustable resistance R and first resistor R1 is connected between the power supply and second node P2 for providing input voltage VCC；
One end of first capacitor C1 is connected with second node P2, other end ground connection.Start-up circuit 102, comprising: second switch transistor
M2；Wherein, the grid of second switch transistor M2 (coincides with a bit) phase with third node P3 with first node P1 in fig. 2 a
Even, source electrode is connected with the power supply for providing input voltage VCC, and drain electrode is connected with the connector (being not shown in Fig. 2 a) of pinboard.
In practical work process, detection chip IC by the first pin 1 be continuously detected characterization lamp plate and pinboard it
Between after the feedback signal such as pulse signal that normally connects, under the triggering of feedback signal by second pin 2 export one it is low
Level signal determines that second opens by adjustable resistance R, first resistor R1 and first capacitor C to open second switch transistor M2
The opening duration of transistor M2 is closed, to be that lamp plate is powered in the duration.Specifically, duration t=k* (r+r1) * c1, wherein k
For coefficient, r is the resistance value of adjustable resistance R, and r1 is the resistance value of first resistor R1, and c1 is the capacitance of first capacitor C1.
Due to persistently receiving feedback signal in detection chip IC to determine between lamp plate and pinboard and normally to connect after, instead
Feedback signal detection trigger chip IC exports a low level signal to open second switch transistor M2, with output signal VCC_
OUT powers to lamp plate, will not damage lamp plate；It, can be true and in the case where detection chip IC does not persistently receive feedback signal
Determine to connect extremely between lamp plate and pinboard, at this time detection chip IC without low level signal output (such as can not export appoint
One high level signal of what signal or output), cause second switch transistor M2 to close, will not power to lamp plate, also would not
Damage lamp plate.Therefore, the connector of the connector and pinboard that avoid lamp plate connects extremely in dislocation, poor contact, anti-plug etc.
Lamp plate power supply, effective protection lamp plate are given in the case of connecing.
It is understood that the type of second switch transistor M2 can be arranged according to detection chip IC output signal.
Such as in above description, detection chip IC exports openable start-up circuit 102 when a low level signal, therefore second switch is brilliant
Body pipe M2 setting is connected under low level effect for P-type transistor, ends under high level effect；For another example specific real
Shi Shi, if detection chip IC exports openable start-up circuit 102, second switch transistor M2 when a high level signal and needs to set
It is set to N-type transistor, is connected under high level effect, is ended under low level effect.
Fig. 2 b show wherein alternatively possible specific embodiment.Since Fig. 2 b is compared with Fig. 2 a, only start-up circuit 102
Specific structure it is different, therefore only difference is introduced below, something in common can refer to Fig. 2 a, and details are not described herein.
Fig. 2 b and Fig. 2 a is compared it is found that start-up circuit 102 specifically increases the 5th resistance in Fig. 2 b compared to Fig. 2 a
R5, the second capacitor C2 and third capacitor C3；Wherein, the 5th resistance R5 and the second capacitor C2 are connected in parallel on power supply and third node P3
Between (being coincided with a bit with first node P1 in figure 2b)；One end of third capacitor C3 is connected with third node P3, the other end
It is connected with the connector (being not shown in Fig. 2 b) of pinboard.Because opening the dash current of moment generation in second switch transistor M2
It is excessive, a degree of damage can be caused to lamp plate, in figure 2b, the 5th resistance R5, the second capacitor C2 and third capacitor C3 can
The dash current that second switch transistor M2 opens moment is adjusted, damage of the dash current to lamp plate is prevented.
Fig. 2 c show wherein another possible specific embodiment.Since Fig. 2 c is compared with Fig. 2 b, only start-up circuit 102
Specific structure it is different, therefore only difference is introduced below, something in common can refer to Fig. 2 b, and details are not described herein.
Fig. 2 c and Fig. 2 b is compared it is found that start-up circuit 102 specifically increases the 4th capacitor C4 in Fig. 2 c compared to Fig. 2 b
With the 5th capacitor C5；Wherein, one end of the 4th capacitor C4 is connected with the power supply for providing input voltage VCC, other end ground connection；5th
One end of capacitor C5 is connected with the connector (being not shown in Fig. 2 c) of pinboard, other end ground connection.In actual application,
Four capacitor C4 and the 5th capacitor C5 primarily serve filter action, so that second switch transistor M2 exports a stable power supply
Signal.
It should be noted that the above is only illustrating on the first, detection circuit 101 and starting are electric in electrical protective device
The specific structure on road 102, in fact, the specific structure of detection circuit 101 and start-up circuit 102 is not limited to the utility model implementation
Example provide above structure, can also be skilled person will appreciate that other structures, it is not limited here.
Electrical protective device on second provided by the embodiment of the utility model, as shown in Figure 3.It is powered on due to shown in Fig. 3
Protective device increases an overvoltage crowbar 103 only with respect to upper electrical protective device shown in FIG. 1, therefore following only to over-voltage
Protection circuit 103 is introduced, remaining can refer to the description of Fig. 1, specifically repeat no more.
As shown in figure 3, overvoltage crowbar 103, when the input voltage VCC for providing in power supply is more than preset threshold,
Start-up circuit 102 is closed, to stop powering to lamp plate, realizes the overvoltage protection to lamp plate.
Electrical protective device on above-mentioned second in order to better understand is carried out below with three possible specific embodiments detailed
It describes in detail bright.
Fig. 4 a show one of possible specific embodiment.The upper electrical protective device as shown in Fig. 4 a, relative to
Upper electrical protective device shown in Fig. 2 a increases only an overvoltage crowbar 103, therefore following only to the tool of overvoltage crowbar 103
Body structure is introduced, remaining can refer to the description of Fig. 2 a, specifically repeats no more.
As shown in fig. 4 a, overvoltage crowbar 103, comprising: zener diode D, second resistance R2,3rd resistor R3 and three
Pole pipe Q；Wherein, the cathode of zener diode D is connected with power supply, and anode is connect by concatenated second resistance R2 and 3rd resistor R3
Ground；Node between the base stage of triode Q and concatenated second resistance R2 and 3rd resistor R3 is connected, collector and first node P1
It is connected, emitter grounding.
In practical work process, zener diode D, second resistance R2 and 3rd resistor R3 determine preset threshold,
When the input voltage VCC of power supply is higher than preset threshold, the base voltage of triode Q is raised, and triode Q is connected and exports control
The signal that second switch transistor M2 is closed avoids high pressure to the adverse effect of lamp plate to stop powering to lamp plate.
Fig. 4 b show wherein alternatively possible specific embodiment.Due to the difference and Fig. 2 b phase of Fig. 4 b and Fig. 4 a
It is identical for the difference of Fig. 2 a, it is that start-up circuit 102 increases the 5th resistance R5, the second capacitor C2 and third capacitor
C3；Therefore beneficial effect of Fig. 4 b compared to Fig. 4 a can refer to figure 2 above b to specific implementation process and retouch compared to the related of Fig. 2 a
It states, specifically repeats no more；Remaining can refer to the associated description of Fig. 4 a, specifically also repeat no more.
Fig. 4 c show wherein another possible specific embodiment.Due to the difference and Fig. 2 c phase of Fig. 4 c and Fig. 4 b
It is identical for the difference of Fig. 2 b, it is that start-up circuit 102 increases the 4th capacitor C4 and the 5th capacitor C5；Therefore Fig. 4 c is compared
It can refer to associated description of the figure 2 above c compared to Fig. 2 b in the beneficial effect and specific implementation process of Fig. 4 b, it is specifically no longer superfluous
It states；Remaining can refer to the associated description of Fig. 4 b, specifically also repeat no more.
It should be noted that the above is only detection circuits 101, start-up circuit in electrical protective device on second of illustration
102 and overvoltage crowbar 103 specific structure, in fact, detection circuit 101, start-up circuit 102 and overvoltage crowbar
103 specific structure is not limited to above structure provided by the embodiment of the utility model, can also be skilled person will appreciate that
Other structures, it is not limited here.
Electrical protective device provided by the embodiment of the utility model on the third, for lamp in the cabinet according to LED display
Connection status between the connector of plate and the connector of pinboard, control lamp plate power on；As shown in Figure 5, comprising: detection circuit
101, start-up circuit 102 and switching circuit 104；Wherein, detection circuit 101, specifically for detecting connector and the switching of lamp plate
Whether normally connected between the connector of plate, and between the connector of connector and pinboard for being continuously detected characterization lamp plate
After the feedback signal normally connected, driving switch circuit 104 is on circuit 102, with by the connector of pinboard to lamp
Plate power supply.
Due to that can determine between lamp plate and pinboard in the case where detection circuit 101 persistently receives feedback signal
Normal connection, driving switch circuit 104 is on circuit 102 and powers to lamp plate at this time, will not damage lamp plate；In detection circuit
In the case that 101 persistently do not receive feedback signal, it can determine and be connected extremely between lamp plate and pinboard, at this time driving switch
Circuit 104 closes start-up circuit 102, will not power to lamp plate, will not damage lamp plate.Therefore, the connector of lamp plate is avoided
Lamp plate is given to power under the abnormal connection such as dislocation, poor contact, anti-plug with the connector of pinboard, effective protection lamp
Plate.
Above-mentioned electrical protective device on the third in order to better understand is carried out below with three possible specific embodiments detailed
It describes in detail bright.
Fig. 6 a show one of possible specific embodiment.As shown in Figure 6 a, detection circuit 101 includes: adjustable electric
Hinder R, first resistor R1, first capacitor C1 and detection chip IC；Wherein, the company of the first pin 1 and pinboard of detection chip IC
Device (being not shown in Fig. 6 a) is connect to be connected, second pin 2 is connected with first node P1, and third pin 3 is connected with second node P2, the
Four pins ground connection；Adjustable resistance R and first resistor R1, which is connected on, to be provided between the power supply and second node P2 that enter and leave voltage VCC；
One end of first capacitor C1 is connected with second node P2, other end ground connection.Start-up circuit 102, comprising: second switch transistor
M2；Wherein, the grid of second switch transistor M2 is connected with third node P3, the power supply phase of source electrode and offer input voltage VCC
Even, drain electrode is connected with the connector (being not shown in Fig. 6 a) of pinboard.Switching circuit 104, comprising: first switch transistor M1 and
4th resistance R4；Wherein, the grid of first switch transistor M1 is connected with first node P1, and source electrode ground connection, drain electrode passes through the 4th
Resistance R4 is connected with third node P3.
In practical work process, detection chip IC by the first pin 1 be continuously detected characterization lamp plate and pinboard it
Between after the feedback signal such as pulse signal that normally connects, a height is exported by second pin 2 under the triggering of feedback signal
Level signal is beaten to open first switch transistor M1 by control second switch transistor M2 after the 4th resistance R4 decompression
It opens, for lamp plate power supply.Specifically, come for the duration of lamp plate power supply by adjustable resistance R, first resistor R1 and first capacitor C1 true
It is fixed, and the duration t=k* (r+r1) * c1, wherein k is coefficient, and r is the resistance value of adjustable resistance R, and r1 is the electricity of first resistor R1
Resistance value, c1 are the capacitance of first capacitor C1.
Due to persistently receiving feedback signal in detection chip IC to determine between lamp plate and pinboard and normally to connect after, instead
Feedback signal detection trigger chip IC exports a high level signal to open first switch transistor M1, and drops through the 4th resistance R4
After pressure, second switch transistor M2 is opened, is powered with output signal VCC_OUT to lamp plate, lamp plate will not be damaged；And in detection core
In the case that piece IC does not persistently receive feedback signal, it can determine and be connected extremely between lamp plate and pinboard, detect core at this time
Piece IC exports (such as can not export one low level signal of any signal or output) without high level signal, causes first to open
It closes transistor M1 to close, and then any signal will not be provided to second switch transistor M2, second switch transistor M2 is closed, no
It can power to lamp plate, would not also damage lamp plate.Therefore, avoid lamp plate connector and pinboard connector dislocation,
Lamp plate power supply, effective protection lamp plate are given under the exception connection such as poor contact, anti-plug.
It is understood that the type of first switch transistor M1 can be arranged according to detection chip IC output signal.
Such as in above description, the detection chip IC output openable switching circuit 104 of one high level signal, therefore first switch crystal
Pipe M1 setting is connected under high level effect for N-type transistor, ends under low level effect；For another example it is being embodied
When, if detection chip IC exports the openable switching circuit 104 of a low level signal, first switch transistor M1 needs to be set as
P-type transistor is connected under low level effect, ends under high level effect.
Fig. 6 b show wherein alternatively possible specific embodiment.Due to the difference and Fig. 2 b phase of Fig. 6 b and Fig. 6 a
It is identical for the difference of Fig. 2 a, it is that start-up circuit 102 increases the 5th resistance R5, the second capacitor C2 and third capacitor
C3；Therefore beneficial effect of Fig. 6 b compared to Fig. 6 a can refer to figure 2 above b to specific implementation process and retouch compared to the related of Fig. 2 a
It states, specifically repeats no more；Remaining can refer to the associated description of Fig. 6 a, specifically also repeat no more.
Fig. 6 c show wherein another possible specific embodiment.Due to the difference and Fig. 2 c phase of Fig. 6 c and Fig. 6 b
It is identical for the difference of Fig. 2 b, it is that start-up circuit 102 increases the 4th capacitor C4 and the 5th capacitor C5；Therefore Fig. 6 c is compared
It can refer to associated description of the figure 2 above c compared to Fig. 2 b in the beneficial effect and specific implementation process of Fig. 6 b, it is specifically no longer superfluous
It states；Remaining can refer to the associated description of Fig. 6 b, specifically also repeat no more.
It should be noted that the above is only illustrate on the third detection circuit 101, start-up circuit in electrical protective device
102 and switching circuit 104 specific structure, in fact, detection circuit 101, start-up circuit 102 and switching circuit 104 it is specific
Structure is not limited to above structure provided by the embodiment of the utility model, can also be skilled person will appreciate that other knot
Structure, it is not limited here.
4th kind provided by the embodiment of the utility model upper electrical protective device, for lamp in the cabinet according to LED display
Connection status between the connector of plate and the connector of pinboard, control lamp plate power on；As shown in fig. 7, comprises: detection circuit
101, start-up circuit 102, overvoltage crowbar 103 and switching circuit 104；Wherein, detection circuit 101 are specifically used for detection lamp
Whether normally connected between the connector of plate and the connector of pinboard, and is being continuously detected the connector of characterization lamp plate and is turning
After the feedback signal normally connected between the connector of fishplate bar, driving switch circuit 104 is on circuit 102, by turning
The connector of fishplate bar is powered to lamp plate.Overvoltage crowbar 103 is more than pre- specifically for the input signal VCC provided in power supply
If when threshold value, driving switch circuit 104 closes start-up circuit 102, to stop powering to lamp plate.
Due to that can determine between lamp plate and pinboard in the case where detection circuit 101 persistently receives feedback signal
Normal connection, driving switch circuit 104 is on circuit 102 and powers to lamp plate at this time, will not damage lamp plate；In detection circuit
In the case that 101 persistently do not receive feedback signal, it can determine and be connected extremely between lamp plate and pinboard, at this time driving switch
Circuit 104 closes start-up circuit 102, will not power to lamp plate, will not damage lamp plate.Therefore, the connector of lamp plate is avoided
Lamp plate is given to power under the abnormal connection such as dislocation, poor contact, anti-plug with the connector of pinboard, effective protection lamp
Plate.And because overvoltage crowbar 103 can close starting electricity when the input voltage VCC that power supply provides is more than preset threshold
Road 102, to stop powering to lamp plate, to realize the overvoltage protection to lamp plate.
Above-mentioned 4th kind upper electrical protective device in order to better understand is carried out below with three possible specific embodiments detailed
It describes in detail bright.
Fig. 8 a show one of possible specific embodiment.Since Fig. 8 a is opposite with Fig. 4 a with the difference of Fig. 6 a
It is identical in the difference of Fig. 2 a, be increase an overvoltage crowbar 103, therefore beneficial effect of Fig. 8 a compared to Fig. 6 a and
Specific implementation process can refer to associated description of the figure 4 above a compared to Fig. 2 a, specifically repeat no more；Remaining can refer to Fig. 6 a's
Associated description specifically also repeats no more.
Fig. 8 b show wherein alternatively possible specific embodiment.Due to the difference and Fig. 2 b phase of Fig. 8 b and Fig. 8 a
It is identical for the difference of Fig. 2 a, it is that start-up circuit 102 increases the 5th resistance R5, the second capacitor C2 and third capacitor
C3；Therefore beneficial effect of Fig. 8 b compared to Fig. 8 a can refer to figure 2 above b to specific implementation process and retouch compared to the related of Fig. 2 a
It states, specifically repeats no more；Remaining can refer to the associated description of Fig. 8 a, specifically also repeat no more.
Fig. 8 c show wherein another possible specific embodiment.Due to the difference and Fig. 2 c phase of Fig. 8 c and Fig. 8 b
It is identical for the difference of Fig. 2 b, it is that start-up circuit 102 increases the 4th capacitor C4 and the 5th capacitor C5；Therefore Fig. 8 c is compared
It can refer to associated description of the figure 2 above c compared to Fig. 2 b in the beneficial effect and specific implementation process of Fig. 8 b, it is specifically no longer superfluous
It states；Remaining can refer to the associated description of Fig. 8 b, specifically also repeat no more.
It should be noted that the above is only illustrate detection circuit 101, start-up circuit in the 4th kind of upper electrical protective device
102, the specific structure of overvoltage crowbar 103 and switching circuit 104, in fact, detection circuit 101, start-up circuit 102, mistake
The specific structure of voltage protection circuit 103 and switching circuit 104 is not limited to above structure provided by the embodiment of the utility model, may be used also
To be skilled person will appreciate that other structures, it is not limited here.
Conceived based on same utility model, the utility model embodiment additionally provides a kind of cabinet, as shown in Figure 9, comprising:
Any of the above-described kind of possible upper electrical protective device 100, the lamp plate 200 with connector, are set the pinboard 300 with connector
The driving plate 400 and power supply 500 being placed on pinboard 300；Wherein, lamp plate 200 and pinboard 300 pass through the connection of lamp plate 200
The connector of device and pinboard 300 is attached；Power supply 500 directly powers to driving plate 400, and in 101 (Fig. 9 of detection circuit
In be not shown) when detecting that lamp plate 200 is normally connect with pinboard 300, be that the connector of pinboard 300 is powered, and through transferring
Power supply signal is transferred to the connector of lamp plate 200 by the connector of plate 300, to realize the power supply to lamp plate 200；Driving plate
400 are sent to driving signal by the connector of pinboard 300 connector of lamp plate 200, to realize to showing on lamp plate 200
The control of content.Since the principle that the cabinet solves the problems, such as is identical as the principle that above-mentioned upper electrical protective device solves the problems, such as,
The implementation of the cabinet may refer to the embodiment of above-mentioned upper electrical protective device, and overlaps will not be repeated.
Because the detection circuit 101 (being not shown in Fig. 9) in upper electrical protective device 100 need to detect the company of a characterization lamp plate 200
The feedback signal normally connected between device and the connector of pinboard 300 is connect, provides feedback signal to avoid adding in cabinet
Element, to simplify box inner structure；Driving plate 400 can be used in the present invention to add the connector of pinboard 300
Detection signal such as pulse signal is carried, the feedback signal that detection circuit 101 need to detect in such cases then can be to be loaded onto turn
The connector of fishplate bar 300, and it is transferred to by the connector of pinboard 300 connector of lamp plate 200, then the company by lamp plate 200
Connect the pulse signal that device feeds back to detection circuit 101 through the connector of pinboard 300.
For the internal structure for being further simplified cabinet, existing power supply 500 in cabinet can also be used to fill for upper electric protection
Set 100 power supplies.It is of course also possible to for the detection circuit 101 in upper electrical protective device 100, start-up circuit 102, overvoltage protection electricity
Power supply is separately provided in road 103 and switching circuit 104, it is not limited here.
In addition, as shown in figure 9, upper electrical protective device 100 can be located on pinboard 300, in this way, making detection electricity
Road 101 (being not shown in Fig. 9) can more easily receive the connector that pinboard 300 is loaded by driving plate 400, and by turning
The connector of fishplate bar 300 is transferred to the connector of lamp plate 200, then anti-through the connector of pinboard 300 by the connector of lamp plate 200
The pulse signal of feedback.
Generally, lamp plate in the prior art is also electrification under blank screen (when i.e. without display picture) state, on the one hand
Energy consumption is increased, if on the other hand certain chips operation irregularity on lamp plate, LED light are likely to also light extremely.In this reality
It, can be under black state, so that driving plate 400 closes the output of pulse signal, detection circuit 101 in cabinet with novel offer
It would not detect feedback signal, will not be powered at this time to lamp plate 200, reduce system power dissipation, and fundamentally solve
The problem of 200 blank screen of lamp plate is lighted extremely.
In addition, when hanging dead there is also control system in the prior art the problem of lamp plate abnormal show, to solve this problem,
It equally can control the output that driving plate 400 closes pulse signal, detection circuit 101 would not detect feedback signal, at this time
It will not be powered on to lamp plate 200, so then can be not charged because of lamp plate 200, so that without display content on lamp plate 200.
Conceived based on same utility model, it includes on multiple that the utility model embodiment, which additionally provides a kind of LED display,
State cabinet.Since the principle that the LED display solves the problems, such as is identical as the principle that above-mentioned cabinet solves the problems, such as, the LED is aobvious
The implementation of display screen may refer to the embodiment of above-mentioned cabinet, and overlaps will not be repeated.
It should be noted that, in this document, such as first and second etc relational terms are used merely to an entity
Or operation is distinguished with another entity or operation, is appointed without necessarily requiring or implying existing between these entities or operation
What this actual relationship or sequence.
Obviously, it is practical without departing from this can to carry out various modification and variations to the utility model by those skilled in the art
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (15)
1. a kind of upper electrical protective device, for the connector of lamp plate in the cabinet according to LED display and the connector of pinboard
Between connection status, control lamp plate power on；It is characterised by comprising: detection circuit and start-up circuit；
Whether the detection circuit normally connects between the connector of the lamp plate and the connector of the pinboard for detecting
The feedback letter for connecing, and normally being connected between the connector for being continuously detected the connector and the pinboard that characterize the lamp plate
After number, the start-up circuit is opened, to power by the connector of the pinboard to lamp plate.
2. upper electrical protective device as described in claim 1, which is characterized in that further include: overvoltage crowbar, in power supply
When the input voltage of offer is more than preset threshold, the start-up circuit is closed, to stop powering to the lamp plate.
3. upper electrical protective device as claimed in claim 2, which is characterized in that further include: switching circuit, in the detection
The start-up circuit is controlled under the driving of circuit and/or the overvoltage crowbar to open or close.
4. upper electrical protective device as claimed in claim 3, which is characterized in that the detection circuit, the start-up circuit and institute
Overvoltage crowbar is stated to be connected with the power supply.
5. upper electrical protective device as claimed in claim 4, which is characterized in that the detection circuit, comprising: adjustable resistance, the
One resistance, first capacitor and detection chip；Wherein,
First pin of the detection chip is connected with the connector of the pinboard, and second pin is connected with first node, the
Three pins are connected with second node, the 4th pin ground connection；
The adjustable resistance and the first resistor are connected between the power supply and the second node；
One end of the first capacitor is connected with the second node, other end ground connection.
6. upper electrical protective device as claimed in claim 5, which is characterized in that the overvoltage crowbar, comprising: two pole of pressure stabilizing
Pipe, second resistance, 3rd resistor and triode；Wherein,
The cathode of the zener diode is connected with the power supply, and anode passes through the concatenated second resistance and third electricity
Resistance ground connection；
Node between the base stage of the triode and the concatenated second resistance and the 3rd resistor is connected, collector and institute
It states first node to be connected, emitter grounding.
7. upper electrical protective device as claimed in claim 5, which is characterized in that the switching circuit, comprising: first switch crystal
Pipe and the 4th resistance；Wherein,
The grid of the first switch transistor is connected with the first node, and source electrode ground connection, drain electrode passes through the 4th resistance
It is connected with third node.
8. upper electrical protective device as claimed in claim 7, which is characterized in that the start-up circuit, comprising: second switch crystal
Pipe；Wherein,
The grid of the second switch transistor is connected with the third node, and source electrode is connected with the power supply, drain electrode with it is described
The connector of pinboard is connected.
9. upper electrical protective device as claimed in claim 8, which is characterized in that the start-up circuit, further includes: the 5th resistance,
Second capacitor and third capacitor；Wherein,
5th resistance and second capacitor are connected in parallel between the power supply and the third node；
One end of the third capacitor is connected with the third node, and the other end is connected with the connector of the pinboard.
10. upper electrical protective device as claimed in claim 9, which is characterized in that the start-up circuit, further includes: the 4th capacitor
With the 5th capacitor；Wherein,
One end of 4th capacitor is connected with the power supply, other end ground connection；
One end of 5th capacitor is connected with the connector of the pinboard, other end ground connection.
11. a kind of cabinet, comprising: the lamp plate with connector, the pinboard with connector are set on the pinboard
Driving plate and power supply；Wherein, the lamp plate and the pinboard pass through the connector of the lamp plate and the connection of the pinboard
Device is attached；The power supply is the lamp plate, the pinboard and driving plate power supply；The driving plate is turned by described
Driving signal is sent to the connector of the lamp plate by the connector of fishplate bar, to realize the control to content is shown on the lamp plate
System；It is characterized by further comprising: such as the described in any item upper electrical protective devices of claim 1-10.
12. cabinet as claimed in claim 11, which is characterized in that the driving plate is also used to the connection to the pinboard
Device load detection signal；Feedback signal is the connector for being loaded onto the pinboard, and is passed by the connector of the pinboard
It is handed to the connector of the lamp plate, then feeds back to detection circuit through the connector of the pinboard by the connector of the lamp plate
The detection signal.
13. cabinet as claimed in claim 11, which is characterized in that the power supply is also used to supply for the upper electrical protective device
Electricity.
14. cabinet as claimed in claim 11, which is characterized in that the upper electrical protective device is located on the pinboard.
15. a kind of LED display characterized by comprising multiple such as the described in any item cabinets of claim 11-14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820954424.5U CN208423793U (en) | 2018-06-20 | 2018-06-20 | A kind of upper electrical protective device, cabinet and LED display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820954424.5U CN208423793U (en) | 2018-06-20 | 2018-06-20 | A kind of upper electrical protective device, cabinet and LED display |
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| Publication Number | Publication Date |
|---|---|
| CN208423793U true CN208423793U (en) | 2019-01-22 |
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| CN201820954424.5U Active CN208423793U (en) | 2018-06-20 | 2018-06-20 | A kind of upper electrical protective device, cabinet and LED display |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975644A (en) * | 2019-03-08 | 2019-07-05 | 佛山市云米电器科技有限公司 | A kind of detection structure and method of connector exception |
| WO2021109539A1 (en) * | 2019-12-07 | 2021-06-10 | 深圳蓝普科技有限公司 | Led display module, and led display screen and control device therefor |
-
2018
- 2018-06-20 CN CN201820954424.5U patent/CN208423793U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975644A (en) * | 2019-03-08 | 2019-07-05 | 佛山市云米电器科技有限公司 | A kind of detection structure and method of connector exception |
| WO2021109539A1 (en) * | 2019-12-07 | 2021-06-10 | 深圳蓝普科技有限公司 | Led display module, and led display screen and control device therefor |
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