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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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 a show technical field, especially relate to an go up electric protection device, box and LED display screen.
Background
The LED display screen comprises a plurality of box concatenations, and the most common box at present includes lamp plate (being display module assembly), drive plate, keysets and power. The lamp panel and the adapter plate are provided with connectors, and power signals and driving signals are mainly arranged on the connectors; the power supply directly supplies power to the drive board and the adapter plate and indirectly supplies power to the lamp panel through connection between the connector of the adapter plate and the connector of the lamp panel; the driver board is installed on the keysets, and the connector through the keysets sends drive signal to the connector of lamp plate to the realization shows the control of content on the lamp plate. At present, in the process of maintaining the LED display screen, the LED display screen is disassembled and assembled under the electrified condition. However, because of the lamp plate is electrified, in case the connector dislocation appears, contact failure or the circumstances such as anti-inserting will lead to the lamp plate to damage in the dismouting in-process, influence the life of lamp plate.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides an go up electric protection device, box and LED display screen for avoid the lamp plate to take place to damage to a certain extent.
Therefore, the embodiment of the utility model provides a go up electric protection device for according to the connected state between the connector of lamp plate and the connector of keysets in the box of LED display screen, control lamp plate to go up electricity; the power-on protection device may include: a detection circuit and a start-up circuit; the detection circuit is used for detecting whether the connector of the lamp panel is normally connected with the connector of the adapter plate or not, and opening the starting circuit after continuously detecting a feedback signal of normal connection between the connector of the characterization lamp panel and the connector of the adapter plate so as to supply power to the lamp panel through the connector of the adapter plate.
The normal connection between the lamp panel and the adapter plate can be determined only under the condition that the detection circuit continuously receives the feedback signal, and the lamp panel is not damaged by turning on the starting circuit to supply power to the lamp panel; therefore, the lamp panel is prevented from being powered by the connector of the lamp panel and the connector of the adapter plate under the abnormal connection condition, and the lamp panel is effectively protected.
Optionally, the power-on protection device further includes: and the overvoltage protection circuit is used for closing the starting circuit when the input voltage provided by the power supply exceeds a preset threshold value so as to stop supplying power to the lamp panel.
In this kind of optional mode, not only can realize the overvoltage protection to the lamp plate, can also prevent the instantaneous impulse voltage of electrified dismouting lamp plate in-process.
Optionally, the power-on protection device further includes: and the switching circuit is used for controlling the starting circuit to be switched on or switched off under the driving of the detection circuit.
In this kind of optional mode, switch circuit converts detection circuitry's output signal into the effective signal that can open starting circuit to when avoiding normally being connected between lamp plate and keysets, can not normally open starting circuit and supply power for the lamp plate.
Optionally, the power-on protection device further includes: and the switching circuit is used for controlling the starting circuit to be switched on or switched off under the driving of the overvoltage protection circuit.
In this kind of optional mode, switch circuit closes under overvoltage protection circuit's output signal's the effect to when avoiding the voltage too high, open the lamp plate damage that starting circuit leads to for the lamp plate power supply.
Optionally, the power-on protection device further includes: and the switching circuit is used for controlling the starting circuit to be switched on or switched off under the driving of the detection circuit and the overvoltage protection circuit.
In the optional mode, the switch circuit not only converts the output signal of the detection circuit into an effective signal capable of turning on the starting circuit, so as to avoid that the starting circuit cannot be normally turned on to supply power to the lamp panel when the lamp panel is normally connected with the adapter plate; and the overvoltage protection circuit is turned off under the action of an output signal, so that the lamp panel damage caused by the fact that the starting circuit is turned on to supply power to the lamp panel when the voltage is too high is avoided.
Optionally, in the power-on protection device, the detection circuit, the start circuit, and the overvoltage protection circuit are all connected to a power supply.
In the optional mode, one power supply is used for uniformly supplying power to the detection circuit, the starting circuit, the overvoltage protection circuit and the switch circuit, so that the structure of the power-on protection device is simpler.
Optionally, the detection circuit in the power-on protection device includes: the device comprises an adjustable resistor, a first capacitor and a detection chip; the first pin of the detection chip is connected with the connector of the adapter plate, the second pin is connected with the first node, the third pin is connected with the second node, and the fourth pin is grounded; the adjustable resistor and the first resistor are connected between the power supply and the second node in series; one end of the first capacitor is connected with the second node, and the other end of the first capacitor is grounded.
In the optional mode, the detection chip outputs a signal to turn on the starting circuit after continuously detecting a feedback signal representing normal connection between the lamp panel and the adapter plate, and the adjustable resistor, the first resistor and the first capacitor determine the turn-on time of the starting circuit so as to supply power to the lamp panel within the time; thereby avoided being connected unusually between lamp plate and the keysets to supply power to the lamp plate, protected the lamp plate.
Optionally, in the power-on protection device, the overvoltage protection circuit includes: the voltage stabilizing diode, the second resistor, the third resistor and the triode; the cathode of the voltage stabilizing diode is connected with a power supply, and the anode of the voltage stabilizing diode is grounded through a second resistor and a third resistor which are connected in series; the base electrode of the triode is connected with a node between the second resistor and the third resistor which are connected in series, the collector electrode of the triode is connected with the first node, and the emitter electrode of the triode is grounded.
In this kind of optional mode, zener diode, second resistance and third resistance have decided and have predetermine the threshold value, and when the input voltage of power was higher than predetermineeing the threshold value, the base voltage of triode was pulled high, and the triode switches on and output control starting circuit closes the signal to stop to the lamp plate power supply, avoided the adverse effect of high pressure to the lamp plate.
Optionally, in the power-on protection device, a switching circuit includes: a first switching transistor and a fourth resistor; the grid electrode of the first switch transistor is connected with the first node, the source electrode of the first switch transistor is grounded, and the drain electrode of the first switch transistor is connected with the third node through the fourth resistor.
In the optional mode, the first switching transistor is conducted under the control of the output signal of the detection chip, and the voltage is reduced through the fourth resistor, and then the starting circuit is controlled to be turned on so as to supply power to the lamp panel; when having avoided normally being connected between lamp plate and keysets, can not normally open starting circuit and supply power for the lamp plate.
In this kind of optional mode, first switch transistor can also close under triode output signal's control, and then closes starting circuit to stop to the lamp plate power supply, avoided the damage of high pressure to the lamp plate.
In this optional mode, the first switching transistor may be further turned on under the control of the output signal of the detection chip, and the start circuit is controlled to be turned on after the voltage is reduced by the fourth resistor, so as to supply power to the lamp panel; and the starting circuit is closed under the control of the output signal of the triode so as to stop supplying power to the lamp panel. The starting circuit is turned on to supply power to the lamp panel when the lamp panel is normally connected with the adapter plate; meanwhile, the lamp panel can be prevented from being damaged by high voltage.
Optionally, starting a circuit in the power-on protection device includes: a second switching transistor; the grid electrode of the second switching transistor is connected with the third node, the source electrode of the second switching transistor is connected with the power supply, and the drain electrode of the second switching transistor is connected with the connector of the adapter plate.
In the optional mode, the second switching transistor is conducted under the control of the output signal of the detection chip so as to supply power to the lamp panel; thereby avoided being connected unusually between lamp plate and the keysets to supply power to the lamp plate, protected the lamp plate.
In this optional mode, the second switching transistor may also be turned off under the control of the output signal of the triode to stop supplying power to the lamp panel; the damage of high pressure to the lamp plate has been avoided.
In this optional mode, the second switching transistor may be further turned on under the control of a signal after the voltage of the fourth resistor is reduced, so as to supply power to the lamp panel; when having avoided normally being connected between lamp plate and keysets, can not normally open starting circuit and supply power for the lamp plate.
Optionally, starting a circuit in the power-on protection device, further includes: a fifth resistor, a second capacitor and a third capacitor; the fifth resistor and the second capacitor are connected between the power supply and the third node in parallel; one end of the third capacitor is connected with the third node, and the other end of the third capacitor is connected with the connector of the adapter plate.
In this kind of optional mode, the adjustable second switch transistor of fifth resistance, second electric capacity and third electric capacity opens the instantaneous rush current, prevents the damage of rush current to the lamp plate.
Optionally, starting a circuit in the power-on protection device, further includes: a fourth capacitor and a fifth capacitor; one end of the fourth capacitor is connected with the power supply, and the other end of the fourth capacitor is grounded; one end of the fifth capacitor is connected with the connector of the adapter plate, and the other end of the fifth capacitor is grounded.
In this alternative, the fourth capacitor and the fifth capacitor mainly perform a filtering function, so that the second switching transistor outputs a stable power supply signal.
Based on same utility model conceive, the embodiment of the utility model provides a box is still provided, include: the lamp panel is provided with a connector, the adapter plate is provided with a connector, and the driver board and the power supply are arranged on the adapter plate; the lamp panel and the adapter plate are connected with the connector of the adapter plate through the connector of the lamp panel; the power supply supplies power to the lamp panel, the adapter plate and the driver board; the driving board sends a driving signal to the connector of the lamp panel through the connector of the adapter plate so as to control the display content on the lamp panel; further comprising: any of the above power-on protection devices.
The normal connection between the lamp panel and the adapter plate can be determined only under the condition that the detection circuit continuously receives the feedback signal, and the lamp panel is not damaged by turning on the starting circuit to supply power to the lamp panel; therefore, the lamp panel is prevented from being powered by the connector of the lamp panel and the connector of the adapter plate under the abnormal connection condition, and the lamp panel is effectively protected.
Optionally, the board is driven in the box body, and the board is further configured to load a detection signal to the connector of the transfer board; the feedback signal is a detection signal which is loaded to the connector of the adapter plate, transmitted to the connector of the lamp panel through the connector of the adapter plate and fed back to the detection circuit through the connector of the adapter plate by the connector of the lamp panel.
In this kind of optional mode, adopt the existing drive plate in the box to provide the feedback signal that characterization lamp plate and keysets normally are connected for going up electric protection device, avoided adding the component that provides feedback signal in the box, simplified box inner structure.
Optionally, the power supply in the box is further configured to supply power to the power-on protection device.
In the optional mode, the power supply in the box body is used for supplying power to the power-on protection device, and the power supply does not need to be additionally arranged aiming at the power-on protection device, so that the internal structure of the box body is simpler as far as possible.
Optionally, the upper electrical protection device is located on the adapter plate in the box.
In this kind of optional mode, go up electric protection device and be located the keysets for detection circuitry can more conveniently receive the connector by drive plate loading to keysets, and transmit to the connector of lamp plate through the connector of keysets, and the detection signal of the connector through the connector feedback of keysets by the connector of lamp plate again.
Based on same utility model the design, the embodiment of the utility model provides a still provide a LED display screen, include: a plurality of any of the above cases.
The utility model discloses beneficial effect as follows:
in the power-on protection device, the box body and the LED display screen provided by the embodiment of the utility model, the power-on protection device is used for controlling the lamp plate to be powered on according to the connection state between the connector of the lamp plate and the connector of the adapter plate in the box body of the LED display screen; comprises a detection circuit and a starting circuit; wherein, detection circuitry opens starting circuit after continuously detecting the feedback signal of normally being connected between the connector of characterization lamp plate and the connector of keysets to supply power to the lamp plate through the connector of keysets. The normal connection between the lamp panel and the adapter plate can be determined only under the condition that the detection circuit continuously receives the feedback signal, and the lamp panel is not damaged by turning on the starting circuit to supply power to the lamp panel; therefore, the lamp panel is prevented from being powered by the connector of the lamp panel and the connector of the adapter plate under the abnormal connection condition, and the lamp panel is effectively protected.
Drawings
Fig. 1 is a schematic structural diagram of an upper power protection device according to an embodiment of the present invention;
fig. 2a to fig. 2c are schematic structural diagrams of the power-on protection device shown in fig. 1;
fig. 3 is a second schematic structural diagram of the power-on protection device according to the embodiment of the present invention;
fig. 4a to 4c are schematic structural diagrams of the power-on protection device shown in fig. 3;
fig. 5 is a third schematic structural diagram of the power-on protection device according to the embodiment of the present invention;
fig. 6a to 6c are schematic structural diagrams of the power-on protection device shown in fig. 5;
fig. 7 is a fourth schematic structural diagram of the power-on protection device according to the embodiment of the present invention;
fig. 8a to 8c are schematic structural diagrams of the power-on protection device shown in fig. 7;
fig. 9 is a schematic structural diagram of a box provided in an embodiment of the present invention.
Detailed Description
The following description is made in detail with reference to the accompanying drawings for the specific implementation of the power-on protection device, the box body and the LED display screen provided by the embodiment of the present invention. It should be noted that the embodiments described in this specification are only some embodiments of the present invention, and not all embodiments; and in case of conflict, the embodiments and features of the embodiments in the present application may be combined with each other; in addition, based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without any creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides a first power-on protection device, which is used for controlling the lamp panel to be powered on according to the connection state between the connector of the lamp panel and the connector of the adapter plate in the box body of the LED display screen; as shown in fig. 1, the first power-on protection device includes: a detection circuit 101 and a start-up circuit 102;
the detection circuit 101 is used for detecting whether the connector of the lamp panel is normally connected with the connector of the adapter plate or not, and after a feedback signal for normally connecting the connector of the characterization lamp panel and the connector of the adapter plate is continuously detected, the starting circuit 102 is turned on to supply power to the lamp panel through the connector of the adapter plate.
Under the condition that the detection circuit 101 continuously receives the feedback signal, normal connection between the lamp panel and the adapter plate can be determined, and the starting circuit 102 is turned on to supply power to the lamp panel, so that the lamp panel cannot be damaged; under the condition that detection circuit 101 does not continuously receive feedback signal, can confirm to be connected unusually between lamp plate and the keysets, close starting circuit 102 this moment, can not give the lamp plate power supply, also can not damage the lamp plate. Therefore, the power supply for the lamp panel is avoided under the abnormal connection conditions of dislocation, poor contact, reverse insertion and the like of the connector of the lamp panel and the connector of the adapter plate, and the lamp panel is effectively protected.
For a better understanding of the first power-on protection device described above, three possible specific embodiments are described in detail below.
One possible embodiment is shown in fig. 2 a. As shown in fig. 2a, the detection circuit 101 includes: the detection circuit comprises an adjustable resistor R, a first resistor R1, a first capacitor C1 and a detection chip IC; wherein, the first pin 1 of the detection chip IC is connected to a connector (not shown in fig. 2 a) of the interposer, the second pin 2 is connected to the first node P1, the third pin 3 is connected to the second node P2, and the fourth pin is grounded; the adjustable resistor R and the first resistor R1 are connected in series between a power supply providing the input voltage VCC and the second node P2; the first capacitor C1 has one terminal connected to the second node P2 and the other terminal connected to ground. A startup circuit 102, comprising: a second switching transistor M2; wherein the gate of the second switching transistor M2 is connected to the third node P3 (coinciding with the first node P1 in fig. 2 a), the source is connected to the power supply providing the input voltage VCC, and the drain is connected to the connector of the adapter plate (not shown in fig. 2 a).
In the actual working process, after the detection chip IC continuously detects a feedback signal, such as a pulse signal, representing normal connection between the lamp panel and the adapter board through the first pin 1, a low level signal is output through the second pin 2 under the trigger of the feedback signal to turn on the second switching transistor M2, and the on-time of the second switching transistor M2 is determined by the adjustable resistor R, the first resistor R1 and the first capacitor C, so as to supply power to the lamp panel within the time. Specifically, the time period t ═ k ═ R + R1 ═ C1, where k is a coefficient, R is a resistance value of the adjustable resistor R, R1 is a resistance value of the first resistor R1, and C1 is a capacitance value of the first capacitor C1.
After the detection chip IC continuously receives the feedback signal to determine that the lamp panel is normally connected with the adapter plate, the feedback signal triggers the detection chip IC to output a low-level signal to turn on the second switching transistor M2 so as to output a signal VCC _ OUT to supply power to the lamp panel, and the lamp panel cannot be damaged; and under the condition that the detection chip IC does not continuously receive the feedback signal, the abnormal connection between the lamp panel and the adapter plate can be determined, and at the moment, the detection chip IC does not output a low-level signal (for example, any signal or a high-level signal can not be output), so that the second switching transistor M2 is turned off, the power supply for the lamp panel is avoided, and the lamp panel is not damaged. Therefore, the power supply for the lamp panel is avoided under the abnormal connection conditions of dislocation, poor contact, reverse insertion and the like of the connector of the lamp panel and the connector of the adapter plate, and the lamp panel is effectively protected.
It will be appreciated that the type of the second switching transistor M2 may be set according to the sense chip IC output signal. For example, in the above description, the start-up circuit 102 is turned on when the detection chip IC outputs a low level signal, so that the second switching transistor M2 is configured as a P-type transistor, which is turned on by a low level and turned off by a high level; for another example, in an implementation, if the detection chip IC outputs a high level signal to turn on the start circuit 102, the second switch transistor M2 is required to be an N-type transistor, which is turned on under the action of a high level and turned off under the action of a low level.
Figure 2b shows another possible embodiment thereof. Since fig. 2b is different from fig. 2a only in the specific structure of the start-up circuit 102, only the difference will be described below, and the same point can refer to fig. 2a and will not be described herein again.
Comparing fig. 2b with fig. 2a, the start-up circuit 102 in fig. 2b specifically adds a fifth resistor R5, a second capacitor C2 and a third capacitor C3 compared to fig. 2 a; wherein the fifth resistor R5 is connected in parallel with the second capacitor C2 between the power supply and a third node P3 (coinciding with the first node P1 in fig. 2 b); one end of the third capacitor C3 is connected to the third node P3 and the other end is connected to a connector (not shown in fig. 2 b) of the patch panel. Because the surge current that produces at the moment of second switch transistor M2 opens is too big, can cause certain degree of damage to the lamp plate, in fig. 2b, the surge current at the moment of second switch transistor M2 opening can be adjusted to fifth resistance R5, second electric capacity C2 and third electric capacity C3, prevents the damage of surge current to the lamp plate.
Fig. 2c shows yet another possible embodiment thereof. Since fig. 2c is different from fig. 2b only in the specific structure of the start-up circuit 102, only the difference is described below, and the same point can refer to fig. 2b, and will not be described herein again.
Comparing fig. 2C with fig. 2b, the start-up circuit 102 in fig. 2C has a fourth capacitor C4 and a fifth capacitor C5 added specifically compared to fig. 2 b; one end of the fourth capacitor C4 is connected to a power supply for providing an input voltage VCC, and the other end is grounded; one end of the fifth capacitor C5 is connected to the connector of the patch panel (not shown in fig. 2C) and the other end is connected to ground. In practical applications, the fourth capacitor C4 and the fifth capacitor C5 mainly perform a filtering function, so that the second switching transistor M2 outputs a stable power signal.
It should be noted that, the above is only an example of the specific structures of the detection circuit 101 and the starting circuit 102 in the first power-on protection device, and actually, the specific structures of the detection circuit 101 and the starting circuit 102 are not limited to the above structures provided by the embodiments of the present invention, and may also be other structures known by those skilled in the art, and are not limited herein.
The embodiment of the utility model provides an electric protection device is gone up to second kind, as shown in figure 3. Since the power-on protection device shown in fig. 3 only adds an overvoltage protection circuit 103 to the power-on protection device shown in fig. 1, only the overvoltage protection circuit 103 is described below, and the rest can be described with reference to fig. 1, and detailed description is omitted.
As shown in fig. 3, the overvoltage protection circuit 103 is configured to close the start circuit 102 when the input voltage VCC provided by the power supply exceeds a preset threshold, so as to stop supplying power to the lamp panel, thereby implementing overvoltage protection for the lamp panel.
For a better understanding of the second power-on protection device described above, three possible specific embodiments are described in detail below.
One possible embodiment is shown in fig. 4 a. Since the power-on protection device shown in fig. 4a only adds one overvoltage protection circuit 103 to the power-on protection device shown in fig. 2a, only the specific structure of the overvoltage protection circuit 103 is described below, and the rest can be described with reference to fig. 2a, and detailed description is omitted.
As shown in fig. 4a, the overvoltage protection circuit 103 includes: the voltage stabilizing diode D, the second resistor R2, the third resistor R3 and the triode Q; the cathode of the voltage stabilizing diode D is connected with a power supply, and the anode of the voltage stabilizing diode D is grounded through a second resistor R2 and a third resistor R3 which are connected in series; the base electrode of the triode Q is connected with a node between the second resistor R2 and the third resistor R3 which are connected in series, the collector electrode is connected with the first node P1, and the emitter electrode is grounded.
In the actual working process, the zener diode D, the second resistor R2 and the third resistor R3 determine a preset threshold, when the input voltage VCC of the power supply is higher than the preset threshold, the base voltage of the triode Q is pulled high, the triode Q is conducted and outputs a signal for controlling the second switching transistor M2 to be turned off, so that power supply to the lamp panel is stopped, and adverse effects of high voltage on the lamp panel are avoided.
Fig. 4b shows another possible embodiment thereof. Since fig. 4b differs from fig. 4a in the same way as fig. 2b differs from fig. 2a, the start-up circuit 102 is added with a fifth resistor R5, a second capacitor C2 and a third capacitor C3; therefore, the beneficial effects and the specific implementation process of fig. 4b compared to fig. 4a can refer to the related description of fig. 2b compared to fig. 2a, and detailed description is not repeated; the rest can refer to the related description of fig. 4a, and will not be described in detail.
Fig. 4c shows yet another possible embodiment thereof. Since fig. 4C differs from fig. 4b by the same difference as fig. 2C differs from fig. 2b, the start-up circuit 102 is added with a fourth capacitor C4 and a fifth capacitor C5; therefore, the beneficial effects and the specific implementation process of fig. 4c compared to fig. 4b can refer to the related description of fig. 2c compared to fig. 2b, and detailed description is omitted; the rest can refer to the related description of fig. 4b, and will not be described in detail.
It should be noted that, the above is only an example of the specific structures of the detection circuit 101, the starting circuit 102 and the overvoltage protection circuit 103 in the second power-on protection device, and actually, the specific structures of the detection circuit 101, the starting circuit 102 and the overvoltage protection circuit 103 are not limited to the above structures provided by the embodiments of the present invention, and may also be other structures known to those skilled in the art, and are not limited herein.
The third power-on protection device provided by the embodiment of the utility model is used for controlling the lamp panel to be powered on according to the connection state between the connector of the lamp panel and the connector of the adapter plate in the box body of the LED display screen; as shown in fig. 5, includes: a detection circuit 101, a start circuit 102, and a switch circuit 104; the detection circuit 101 is specifically configured to detect whether the connector of the lamp panel is normally connected to the connector of the adapter plate, and after continuously detecting a feedback signal indicating that the connector of the lamp panel is normally connected to the connector of the adapter plate, the drive switch circuit 104 turns on the start circuit 102 to supply power to the lamp panel through the connector of the adapter plate.
Under the condition that the detection circuit 101 continuously receives the feedback signal, normal connection between the lamp panel and the adapter plate can be determined, and at the moment, the driving switch circuit 104 turns on the starting circuit 102 to supply power to the lamp panel, so that the lamp panel cannot be damaged; under the condition that the detection circuit 101 does not continuously receive the feedback signal, the abnormal connection between the lamp panel and the adapter plate can be determined, and the starting circuit 102 is closed by the driving switch circuit 104 at the moment, so that power can not be supplied to the lamp panel, and the lamp panel can not be damaged. Therefore, the power supply for the lamp panel is avoided under the abnormal connection conditions of dislocation, poor contact, reverse insertion and the like of the connector of the lamp panel and the connector of the adapter plate, and the lamp panel is effectively protected.
For a better understanding of the third power-on protection device described above, three possible specific embodiments are described in detail below.
One possible embodiment is shown in fig. 6 a. As shown in fig. 6a, the detection circuit 101 includes: the detection circuit comprises an adjustable resistor R, a first resistor R1, a first capacitor C1 and a detection chip IC; wherein, the first pin 1 of the detection chip IC is connected to a connector (not shown in fig. 6 a) of the interposer, the second pin 2 is connected to the first node P1, the third pin 3 is connected to the second node P2, and the fourth pin is grounded; the adjustable resistor R and the first resistor R1 are connected in series between a power supply providing an input/output voltage VCC and a second node P2; the first capacitor C1 has one terminal connected to the second node P2 and the other terminal connected to ground. A startup circuit 102, comprising: a second switching transistor M2; wherein the second switching transistor M2 has a gate connected to the third node P3, a source connected to a power supply providing the input voltage VCC, and a drain connected to a connector (not shown in fig. 6 a) of the adapter plate. A switching circuit 104, comprising: a first switching transistor M1 and a fourth resistor R4; the gate of the first switching transistor M1 is connected to the first node P1, the source is grounded, and the drain is connected to the third node P3 through the fourth resistor R4.
In an actual working process, after the detection chip IC continuously detects a feedback signal representing normal connection between the lamp panel and the adapter board, such as a pulse signal, through the first pin 1, a high level signal is output through the second pin 2 under the trigger of the feedback signal to turn on the first switching transistor M1, and the voltage is reduced through the fourth resistor R4 to control the second switching transistor M2 to be turned on so as to supply power to the lamp panel. Specifically, the duration of supplying power to the lamp panel is determined by the adjustable resistor R, the first resistor R1 and the first capacitor C1, and the duration t is k (R + R1) C1, where k is a coefficient, R is a resistance value of the adjustable resistor R, R1 is a resistance value of the first resistor R1, and C1 is a capacitance value of the first capacitor C1.
After the detection chip IC continuously receives the feedback signal to determine that the lamp panel is normally connected with the adapter plate, the feedback signal triggers the detection chip IC to output a high-level signal to turn on the first switching transistor M1, and after the high-level signal is reduced by the fourth resistor R4, the second switching transistor M2 is turned on to output a signal VCC _ OUT to supply power to the lamp panel, so that the lamp panel cannot be damaged; and under the condition that the detection chip IC does not continuously receive the feedback signal, the abnormal connection between the lamp panel and the adapter plate can be determined, at the moment, the detection chip IC does not output a high-level signal (for example, any signal or a low-level signal can not be output), so that the first switching transistor M1 is turned off, further, no signal can be provided for the second switching transistor M2, the second switching transistor M2 is turned off, power can not be supplied to the lamp panel, and the lamp panel can not be damaged. Therefore, the power supply for the lamp panel is avoided under the abnormal connection conditions of dislocation, poor contact, reverse insertion and the like of the connector of the lamp panel and the connector of the adapter plate, and the lamp panel is effectively protected.
It will be appreciated that the type of the first switching transistor M1 may be set according to the sense chip IC output signal. For example, in the above description, the detection chip IC outputs a high level signal to turn on the switch circuit 104, so that the first switch transistor M1 is configured as an N-type transistor, which is turned on by a high level and turned off by a low level; for another example, in an implementation, if the detection chip IC outputs a low level signal to turn on the switch circuit 104, the first switch transistor M1 needs to be a P-type transistor, which is turned on under the action of a low level and turned off under the action of a high level.
Fig. 6b shows another possible embodiment thereof. Since fig. 6b differs from fig. 6a in the same way as fig. 2b differs from fig. 2a, the start-up circuit 102 is added with a fifth resistor R5, a second capacitor C2 and a third capacitor C3; therefore, the beneficial effects and the specific implementation process of fig. 6b compared to fig. 6a can refer to the related description of fig. 2b compared to fig. 2a, and detailed description is not repeated; the rest can refer to the related description of fig. 6a, and will not be described in detail.
Fig. 6c shows yet another possible embodiment thereof. Since fig. 6C differs from fig. 6b by the same difference as fig. 2C differs from fig. 2b, the start-up circuit 102 is added with a fourth capacitor C4 and a fifth capacitor C5; therefore, the beneficial effects and the specific implementation process of fig. 6c compared to fig. 6b can refer to the related description of fig. 2c compared to fig. 2b, and detailed description is not repeated; the rest can refer to the related description of fig. 6b, and will not be described in detail.
It should be noted that, the above is only an example of the specific structures of the detection circuit 101, the starting circuit 102 and the switch circuit 104 in the third power-on protection device, and actually, the specific structures of the detection circuit 101, the starting circuit 102 and the switch circuit 104 are not limited to the above structures provided by the embodiments of the present invention, and may also be other structures known to those skilled in the art, and are not limited herein.
The fourth power-on protection device provided by the embodiment of the utility model is used for controlling the lamp panel to be powered on according to the connection state between the connector of the lamp panel and the connector of the adapter plate in the box body of the LED display screen; as shown in fig. 7, includes: a detection circuit 101, a starting circuit 102, an overvoltage protection circuit 103 and a switch circuit 104; the detection circuit 101 is specifically configured to detect whether the connector of the lamp panel is normally connected to the connector of the adapter plate, and after continuously detecting a feedback signal indicating that the connector of the lamp panel is normally connected to the connector of the adapter plate, the drive switch circuit 104 turns on the start circuit 102 to supply power to the lamp panel through the connector of the adapter plate. The overvoltage protection circuit 103 is specifically configured to drive the switch circuit 104 to turn off the start circuit 102 when an input signal VCC provided by the power supply exceeds a preset threshold, so as to stop supplying power to the lamp panel.
Under the condition that the detection circuit 101 continuously receives the feedback signal, normal connection between the lamp panel and the adapter plate can be determined, and at the moment, the driving switch circuit 104 turns on the starting circuit 102 to supply power to the lamp panel, so that the lamp panel cannot be damaged; under the condition that the detection circuit 101 does not continuously receive the feedback signal, the abnormal connection between the lamp panel and the adapter plate can be determined, and the starting circuit 102 is closed by the driving switch circuit 104 at the moment, so that power can not be supplied to the lamp panel, and the lamp panel can not be damaged. Therefore, the power supply for the lamp panel is avoided under the abnormal connection conditions of dislocation, poor contact, reverse insertion and the like of the connector of the lamp panel and the connector of the adapter plate, and the lamp panel is effectively protected. And because overvoltage crowbar 103 can close starting circuit 102 when input voltage VCC that the power provided exceeds and preserve the threshold value, in order to stop to supplying power to the lamp plate, thus has realized the overvoltage crowbar to the lamp plate.
In order to better understand the fourth power-on protection device, three possible embodiments are described in detail below.
One possible embodiment is shown in fig. 8 a. Since the difference between fig. 8a and fig. 6a is the same as the difference between fig. 4a and fig. 2a, and an overvoltage protection circuit 103 is added, the beneficial effects and the specific implementation process of fig. 8a compared to fig. 6a can refer to the related description of fig. 4a compared to fig. 2a, and detailed description thereof is omitted; the rest can refer to the related description of fig. 6a, and will not be described in detail.
Fig. 8b shows another possible embodiment thereof. Since fig. 8b differs from fig. 8a in the same way as fig. 2b differs from fig. 2a, the start-up circuit 102 is added with a fifth resistor R5, a second capacitor C2 and a third capacitor C3; therefore, the beneficial effects and the specific implementation process of fig. 8b compared to fig. 8a can refer to the related description of fig. 2b compared to fig. 2a, and detailed description is not repeated; the rest can refer to the related description of fig. 8a, and will not be described in detail.
Fig. 8c shows yet another possible embodiment thereof. Since fig. 8C differs from fig. 8b by the same difference as fig. 2C differs from fig. 2b, the start-up circuit 102 is added with a fourth capacitor C4 and a fifth capacitor C5; therefore, the beneficial effects and the specific implementation process of fig. 8c compared to fig. 8b can refer to the related description of fig. 2c compared to fig. 2b, and detailed description is not repeated; the rest can refer to the related description of fig. 8b, and will not be described in detail.
It should be noted that, the above is only an example of the specific structures of the detection circuit 101, the starting circuit 102, the overvoltage protection circuit 103 and the switch circuit 104 in the fourth power-on protection device, and actually, the specific structures of the detection circuit 101, the starting circuit 102, the overvoltage protection circuit 103 and the switch circuit 104 are not limited to the above structures provided by the embodiments of the present invention, and may also be other structures known by those skilled in the art, which are not limited herein.
Based on the same utility model, the embodiment of the utility model provides a box is still provided, as shown in fig. 9, include: any one of the above possible power-on protection devices 100 includes a lamp panel 200 with a connector, an adapter board 300 with a connector, a driver board 400 disposed on the adapter board 300, and a power supply 500; the lamp panel 200 and the adapter plate 300 are connected with the connector of the adapter plate 300 through the connector of the lamp panel 200; the power supply 500 directly supplies power to the driver board 400, supplies power to the connector of the adapter board 300 when the detection circuit 101 (not shown in fig. 9) detects that the lamp panel 200 is normally connected with the adapter board 300, and transmits a power signal to the connector of the lamp panel 200 through the connector of the adapter board 300, thereby supplying power to the lamp panel 200; the driver board 400 transmits a driving signal to the connector of the lamp panel 200 through the connector of the adaptor board 300 to realize control of the display content on the lamp panel 200. Because the principle of solving the problem of the box body is the same as that of solving the problem of the power-on protection device, the implementation of the box body can refer to the embodiment of the power-on protection device, and repeated parts are not described again.
Because the detection circuit 101 (not shown in fig. 9) in the power-on protection device 100 needs to detect a feedback signal indicating that the connector of the lamp panel 200 and the connector of the adapter board 300 are normally connected, an element for providing the feedback signal is not additionally arranged in the box body, so as to simplify the internal structure of the box body; the utility model discloses in can adopt drive plate 400 to adapter plate 300's connector loading detection signal such as pulse signal, the feedback signal that detection circuitry 101 need detect under this kind of circumstances then can be for loading to adapter plate 300's connector to transmit to lamp plate 200's connector through adapter plate 300's connector, the pulse signal of connector feedback to detection circuitry 101 through adapter plate 300 by lamp plate 200's connector again.
In order to further simplify the internal structure of the box, the power supply 500 existing in the box can be used to supply power to the upper power protection device 100. Of course, the power supply source may also be provided separately for the detection circuit 101, the start circuit 102, the overvoltage protection circuit 103, and the switch circuit 104 in the power-on protection device 100, and is not limited herein.
In addition, as shown in fig. 9, the power-on protection device 100 may be located on the adapter board 300, so that the detection circuit 101 (not shown in fig. 9) may more conveniently receive the connector loaded to the adapter board 300 by the driving board 400, transmit the connector to the connector of the lamp panel 200 through the connector of the adapter board 300, and then receive the pulse signal fed back by the connector of the lamp panel 200 through the connector of the adapter board 300.
Generally, a lamp panel in the prior art is also electrified in a black screen (i.e., when no display screen is provided), so that on one hand, energy consumption is increased, and on the other hand, if a certain chip on the lamp panel works abnormally, the LED lamp is likely to be turned on abnormally. The utility model provides an in the box, can be under the black screen state for drive plate 400 closes pulse signal's output, and detection circuit 101 just can not detect feedback signal, can not give lamp plate 200 electricity this moment, has reduced the system power consumption, and fundamentally has solved the problem that lamp plate 200 black screen lighted unusually moreover.
In addition, the problem of abnormal display of the lamp panel when the control system is hung up still exists in the prior art, and for solving the problem, the driver board 400 can be controlled to close the output of the pulse signal, the detection circuit 101 cannot detect the feedback signal, and the lamp panel 200 cannot be powered on at the moment, so that the lamp panel 200 does not have display content.
Based on same utility model the design, the embodiment of the utility model provides a still provides a LED display screen and includes a plurality of above-mentioned boxes. Because the principle of solving the problem of the LED display screen is the same as that of solving the problem of the box body, the implementation of the LED display screen can refer to the embodiment of the box body, and repeated parts are not repeated.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (15)
1. A power-on protection device is used for controlling a lamp panel to be powered on according to the connection state between a connector of the lamp panel and a connector of an adapter plate in a box body of an LED display screen; it is characterized by comprising: a detection circuit and a start-up circuit;
the detection circuit is used for detecting whether the connector of the lamp panel is normally connected with the connector of the adapter plate or not, and opening the starting circuit after continuously detecting the feedback signal for normally connecting the connector of the lamp panel with the connector of the adapter plate so as to supply power to the lamp panel through the connector of the adapter plate.
2. The power-on protection device of claim 1, further comprising: and the overvoltage protection circuit is used for closing the starting circuit when the input voltage provided by the power supply exceeds a preset threshold value so as to stop supplying power to the lamp panel.
3. The power-on protection device of claim 2, further comprising: and the switching circuit is used for controlling the starting circuit to be switched on or switched off under the driving of the detection circuit and/or the overvoltage protection circuit.
4. A power-on protection device according to claim 3, wherein said detection circuit, said start-up circuit and said overvoltage protection circuit are all connected to said power supply.
5. The power-on protection device of claim 4, wherein the detection circuit comprises: the device comprises an adjustable resistor, a first capacitor and a detection chip; wherein,
a first pin of the detection chip is connected with the connector of the adapter plate, a second pin of the detection chip is connected with a first node, a third pin of the detection chip is connected with a second node, and a fourth pin of the detection chip is grounded;
the adjustable resistor and the first resistor are connected in series between the power supply and the second node;
one end of the first capacitor is connected with the second node, and the other end of the first capacitor is grounded.
6. The power-on protection device according to claim 5, wherein said overvoltage protection circuit comprises: the voltage stabilizing diode, the second resistor, the third resistor and the triode; wherein,
the cathode of the voltage stabilizing diode is connected with the power supply, and the anode of the voltage stabilizing diode is grounded through the second resistor and the third resistor which are connected in series;
the base electrode of the triode is connected with a node between the second resistor and the third resistor which are connected in series, the collector electrode of the triode is connected with the first node, and the emitter electrode of the triode is grounded.
7. The power-on protection device of claim 5, wherein the switching circuit comprises: a first switching transistor and a fourth resistor; wherein,
and the grid electrode of the first switch transistor is connected with the first node, the source electrode of the first switch transistor is grounded, and the drain electrode of the first switch transistor is connected with the third node through the fourth resistor.
8. The power-on protection device of claim 7, wherein the startup circuit comprises: a second switching transistor; wherein,
and the grid electrode of the second switching transistor is connected with the third node, the source electrode of the second switching transistor is connected with the power supply, and the drain electrode of the second switching transistor is connected with the connector of the adapter plate.
9. The power-on protection device of claim 8, wherein the startup circuit further comprises: a fifth resistor, a second capacitor and a third capacitor; wherein,
the fifth resistor and the 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 of the third capacitor is connected with the connector of the adapter plate.
10. The power-on protection device of claim 9, wherein the startup circuit further comprises: a fourth capacitor and a fifth capacitor; wherein,
one end of the fourth capacitor is connected with the power supply, and the other end of the fourth capacitor is grounded;
one end of the fifth capacitor is connected with the connector of the adapter plate, and the other end of the fifth capacitor is grounded.
11. A cabinet, comprising: the lamp panel is provided with a connector, the adapter plate is provided with a connector, and the driver board and the power supply are arranged on the adapter plate; the lamp panel and the adapter plate are connected with a connector of the adapter plate through a connector of the lamp panel; the power supply supplies power to the lamp panel, the adapter plate and the driver board; the driving board sends a driving signal to the connector of the lamp panel through the connector of the adapter board so as to control the display content on the lamp panel; it is characterized by also comprising: the power-on protection device according to any one of claims 1-10.
12. The cabinet of claim 11, wherein the drive board is further configured to load a test signal on a connector of the interposer; the feedback signal is a detection signal which is loaded to the connector of the adapter plate, is transmitted to the connector of the lamp panel through the connector of the adapter plate, and is fed back to the detection circuit through the connector of the adapter plate by the connector of the lamp panel.
13. The case of claim 11, wherein the power source is further configured to provide power to the power-on protection device.
14. A housing as claimed in claim 11, wherein the power-on protection device is located on the adapter plate.
15. An LED display screen, comprising: a plurality of housings according to any one of claims 11 to 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 |
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| 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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| CN208423793U true CN208423793U (en) | 2019-01-22 |
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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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