CN210245030U - Redundant lamp strip drive circuit - Google Patents
Redundant lamp strip drive circuit Download PDFInfo
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- CN210245030U CN210245030U CN201921324689.8U CN201921324689U CN210245030U CN 210245030 U CN210245030 U CN 210245030U CN 201921324689 U CN201921324689 U CN 201921324689U CN 210245030 U CN210245030 U CN 210245030U
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Abstract
The utility model is suitable for a lamp strip drive technical field provides a redundant lamp strip drive circuit, include: a power supply conversion circuit; a back light drive controller; a light bar switch switching circuit; a current return circuit; the dual redundant lamp sets are respectively connected with the power supply conversion circuit, the lamp strip switch switching circuit and the current return circuit, and can control switching; the power conversion circuit is respectively connected with the backlight drive controller, the light bar switch switching circuit and the current return circuit, and the light bar switch switching circuit and the current return circuit are respectively connected with the backlight drive controller. The utility model provides a prior art LCD screen has the problem of low reliability and low life-span, and then realizes the high reliability and the high life-span of LCD screen.
Description
Technical Field
The utility model belongs to the technical field of the lamp strip drive, especially, relate to a redundant lamp strip drive circuit.
Background
With the development of smart cities, outdoor high-brightness display devices are more and more widely applied, and the most widely applied liquid crystal display devices are high-resolution and large-size liquid crystal display screens. Because the brightness of outdoor environment is very high, the liquid crystal screen needs very high power to drive backlight in order to realize high brightness, which leads to very high power density and temperature rise of backlight lamp strips, thousands of lamp beads are adopted in the large-screen liquid crystal screen, and as long as one lamp bead is damaged, black stripes appear on the liquid crystal screen, so that how to realize high reliability and long service life brings very great challenge. Therefore, the liquid crystal display screen in the prior art has the problems of low reliability and short service life.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a redundant lamp strip drive circuit aims at solving the problem that there are low reliability and low life-span in prior art LCD screen.
The embodiment of the utility model provides a redundant lamp strip drive circuit, include: a power supply conversion circuit; a back light drive controller; a light bar switch switching circuit; a current return circuit; the dual redundant lamp sets are respectively connected with the power supply conversion circuit, the lamp strip switch switching circuit and the current return circuit, and can control switching; the power conversion circuit is respectively connected with the backlight drive controller, the light bar switch switching circuit and the current return circuit, and the light bar switch switching circuit and the current return circuit are respectively connected with the backlight drive controller.
Still further, the dual redundant lamp set includes: a first redundant light bar and a second redundant light bar; the positive electrode of the first redundant light bar is connected with a power conversion circuit, and the negative electrode of the first redundant light bar is connected with the light bar switch switching circuit; the second redundant lamp bar anode is arranged on a connecting line between the first redundant lamp bar anode and the power conversion circuit, and the second redundant lamp bar cathode is connected with the current return circuit.
Furthermore, the power supply conversion circuit is connected with the backlight drive controller through a lamp set driving current signal;
the light bar switch switching circuit is connected with the backlight drive controller through a first light bar enabling signal and a first testing current signal, and the first light bar enabling signal and the first testing current signal correspond to the first redundant light bar;
the current return test circuit is connected with the backlight drive controller through a second lamp bar enabling signal and a second return test current signal, and the second lamp bar enabling signal and the second return test current signal correspond to the second redundant lamp bar.
Furthermore, the back light drive controller is an ARM processor.
Further, the power conversion circuit includes: a DCDC converter.
The utility model has the advantages that the utility model adopts the power supply conversion circuit; a back light drive controller; a light bar switch switching circuit; a current return circuit; and the dual redundant lamp sets are respectively connected with the power supply conversion circuit, the lamp strip switch switching circuit and the current return circuit to control and drive the dual redundant lamp sets in a matching way. When the dual redundant lamp set fails, backup and fault detection of redundant lamp strips can be realized, the fault lamp strips can be automatically switched to the backup lamp strips, and backlight can still be driven to keep liquid crystal display under the condition that half of the limit lamp strips are allowed to be damaged. The utility model provides a prior art LCD screen has the problem of low reliability and low life-span, and then realizes the high reliability and the high life-span of LCD screen.
Drawings
Fig. 1 is a schematic structural diagram of a redundant light bar driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a redundant light bar driving method according to an embodiment of the present invention.
Wherein, 1, a back light drive controller; 2. a power supply conversion circuit; 3. a first redundant light bar; 4. a second redundant light bar; 5. a dual redundant lamp set; 6. a light bar switch switching circuit; 7. a current return circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a redundant light bar driving circuit provided in an embodiment of the present invention; this redundant lamp strip drive circuit includes: a power supply conversion circuit 2; a backlight drive controller 1; a light bar switch switching circuit 6; a current return circuit 7; the dual redundant lamp set 5 is respectively connected with the power supply conversion circuit 2, the lamp strip switch switching circuit 6 and the current return circuit 7, and the dual redundant lamp set 5 can control switching; the power conversion circuit 2 is respectively connected with the backlight drive controller 1, the light bar switch switching circuit 6 and the current return circuit 7, and the light bar switch switching circuit 6 and the current return circuit 7 are respectively connected with the backlight drive controller 1.
Further, the back light drive controller 1 is an ARM processor; the power conversion circuit 2 includes: a DCDC converter; the light bar SWITCH switching circuit 6 comprises a SWITCH I; the current return circuit 7 includes a SWITCH two.
Further, the dual redundant lamp set 5 includes: a first redundant light bar 3 and a second redundant light bar 4; the positive electrode of the first redundant light bar 3 is connected with the power conversion circuit 2, and the negative electrode of the first redundant light bar 3 is connected with the light bar switch switching circuit 6; the positive pole of the second redundant light bar 4 is arranged on a connecting line between the positive pole of the first redundant light bar 3 and the power conversion circuit 2, and the negative pole of the second redundant light bar 4 is connected with the current return circuit 7.
Further, the power conversion circuit 2 is connected with the backlight drive controller 1 through a lamp set drive current signal. The light bar switch switching circuit 6 is connected with the backlight drive controller 1 through a first light bar enabling signal and a first test current signal, and the first light bar enabling signal and the first test current signal correspond to the first redundant light bar 3. The current feedback circuit 7 is connected with the backlight drive controller 1 through a second light bar enabling signal and a second return current signal, and the second light bar enabling signal and the second return current signal correspond to the second redundant light bar 4.
The dual redundant lamp set 5 can be a dual redundant LED lamp set, the first redundant lamp strip 3 can be a first redundant LED lamp strip, the first redundant LED lamp strip comprises a first LED lamp, the second redundant lamp strip 4 can be a second redundant LED lamp strip, and the second redundant LED lamp strip comprises a second LED lamp.
The ARM processor comprises: the pin LED-DIM is used for outputting a backlight driving constant current signal; the pin GND is used for grounding; the pin LED-EN1 is used for outputting a first light bar enabling signal; a pin LED-IFB1 for receiving a first return current signal; the pin LED-EN2 is used for outputting a second light bar enabling signal; pin LED-IFB2 for receiving a second return current signal. And the ARM processor is provided with a functional module for controlling the corresponding function of each pin.
The DCDC converter includes: the pin VIN is used for being connected with a power supply; the pin GND is used for grounding; the pin DIM is used for receiving a backlight driving constant current signal transmitted by the pin LED-DIM; the pin VLED + is used for outputting a backlight driving constant current signal to control the dual redundant lamp set 5, and specifically, is used for connecting the positive electrode of the first redundant lamp strip 3 and the positive electrode of the second redundant lamp strip 4; pin VLED "for connecting SWITCH one and SWITCH two, respectively. The DCDC converters are provided with functional modules for controlling the corresponding functions of the pins.
The SWITCH includes: the pin GND is used for grounding; the pin LED-EN is used for receiving a first light bar enabling signal output by the pin LED-EN1 in the ARM processor; the pin I-LED is used for outputting a first test current signal of the first redundant light bar 3 to a pin LED-IFB1 in the ARM processor; pin VLED + is used for connecting pin VLED-in the DCDC converter to form a loop; and the pin LED-K-is used for connecting the negative electrode of the first redundant lamp bar 3 to form a loop.
The SWITCH b includes: the pin GND is used for grounding; the pin LED-EN is used for receiving a second light bar enabling signal output by the pin LED-EN2 in the ARM processor; the pin I-LED is used for outputting a second return current signal of the second redundant light bar 4 to a pin LED-IFB2 in the ARM processor; pin VLED + is used for connecting pin VLED-in the DCDC converter to form a loop; and the pin LED-K-is used for connecting the negative electrode of the second redundant lamp bar 4 to form a loop.
In the embodiment of the utility model, the utility model adopts a power conversion circuit 2; a backlight drive controller 1; a light bar switch switching circuit 6; a current return circuit 7; and the dual redundant lamp set 5 is respectively connected with the power conversion circuit 2, the lamp strip switch switching circuit 6 and the current return circuit 7 and is matched with the power conversion circuit to control and drive the dual redundant lamp set 5. When the dual redundant lamp set 5 breaks down, the backup of redundant lamp strips and the fault detection can be realized, the fault lamp strips can be automatically switched to the backup lamp strips, and the backlight can be still driven to keep the liquid crystal display under the condition that the limit half of the lamp strips are damaged. The utility model provides a prior art LCD screen has the problem of low reliability and low life-span, and then realizes the high reliability and the high life-span of LCD screen.
As shown in fig. 2, fig. 2 is a schematic view of a redundant light bar driving method according to an embodiment of the present invention, which is used in the redundant light bar driving circuit provided by the above embodiment, the redundant light bar driving method includes the following steps:
and S101, when the power supply signal is detected, adjusting the constant current value of the backlight drive and outputting the constant current value to the power supply conversion circuit.
S102, turning on each group of dual redundant lamp groups according to a backlight driving constant current value and an enabling signal; the enable signal corresponds to the dual redundant light bank, and the enable signal includes a first light bar enable signal for controlling the first redundant light bar and a second light bar enable signal for controlling the second redundant light bar.
And S103, detecting the current value of each group of dual redundant lamp groups.
And S104, judging whether the dual redundant lamp group 5 has a fault according to the dual redundant lamp group current value and the backlight driving constant current value.
And S105, if the fault exists, switching control is carried out on the dual redundant lamp group.
Specifically, the volt-ampere characteristic of the LED is a positive coefficient, that is, the voltage drop of the LED increases with the increase of the current, the utility model discloses well redundant lamp strip is because adopted dual redundancy, so can adopt under the unchangeable circumstances of power conversion circuit total backlight drive current, let first redundant LED lamp strip, the logic that second redundant LED2 lamp strip drive simultaneously and light, luminance is basically the same with luminance when single lamp strip lights this moment, but the current of every redundant LED lamp strip is halved, the voltage drop of redundant LED lamp strip is littleer, and nearly 80% power of LED lamp in the redundant LED lamp strip is heating up, therefore after reducing voltage, direct effect is exactly that calorific capacity effectively reduces, the temperature rise is littleer; the service life of the LED lamp is inversely proportional to the temperature, and because all the LEDs are lighted simultaneously, the thermal resistance is smaller, the heat dissipation is better, and the total temperature rise is smaller. The service life of the LED is improved by about 2 times when the junction temperature of the LED is reduced by 10 ℃ according to industry rough estimation data; and because the dual redundant lamp groups are adopted, the redundant lamp strips are doubled, and the quantity of the LED lamp beads is doubled, the total service life can be prolonged by more than 2 times theoretically.
Further, the total LED backlight driving current of the power supply conversion circuit is controlled by an LED-DIM signal (backlight driving constant current signal) in the back ARM processor, and the power current output of the power supply conversion circuit is output by VLED + and returned by VLED-. The sum of the first return current and the second return current measured by the loop currents of the first redundant light bar and the second redundant light bar is equal to the total output current of the power supply conversion circuit, namely the sum of the first return current value and the second return current value is equal to the backlight driving constant current value of the power supply conversion circuit. Because the lamp strips adopt the completely same lamp bead welding method and are positioned at adjacent positions, when the LED backlight module normally works, the first return current value and the second return current value are almost the same, and the failure mode of the highlight LED is an open circuit, so that whether the lamp strips have failure faults or not can be judged through the first return current value, the second return current value or the absolute value and the relative value, and when the lamp strips have the faults, the backlight drive controller can perform redundant switching on the first redundant lamp strips and the second redundant lamp strips through the first lamp strip enabling signals and the second lamp strip enabling signals.
Because the liquid crystal screen generally adopts dozens of redundant light bars, in order to realize the longest service life and the highest redundancy, the optimal switching logic must exist. All the lamp strips are driven to light under normal conditions, and the lighting effect is uniform, the heating is minimum and the service life is longest at the moment; when a single lamp strip fails, namely a lamp group fails, odd-even switching of the whole screen of the lamp group is carried out (for example, if a lamp group in an odd group fails, all the odd group of the lamp groups are closed, and the even group of the lamp groups are opened), and at the moment, the screen brightness still has perfect consistency; when a certain lamp strip in the lamp group breaks down, the odd-even lamp strips of the adjacent groups are switched, and due to the fact that special design is carried out on lamp bead arrangement, the screen brightness difference is very small at the moment, obvious difference does not exist, at most, half of the lamp strips of the whole screen break down at the moment, basic normal display can still be kept, and the maximum redundancy is achieved at the moment.
The utility model discloses a two lamp strips of a set of power drive power supply redundant lamp group of simultaneous drive, consequently, whole circuit design is compared with non-redundant drive circuit, the power drive part circuit is the same, only current detection circuit and lamp strip quantity have been increased, consequently, can realize redundant function with minimum cost and face, and the lamp pearl that has adopted first redundant lamp strip and the redundant lamp strip of second at ordinary times is lighted simultaneously, carry out whole screen or singly organize the lamp strip and switch during the trouble, consequently, the limit can allow under half lamp strip breakdown situations, still can normally work.
Because the constant current drive power supply of the redundant lamp strip adopts the same group, even if the redundant detection circuit is switched by mistake, the drive current of the constant current drive power supply is a constant value, the situations of electric overstress overload and the like of circuit devices can not be caused, the circuit is still safe and can not be damaged, and therefore the redundant lamp strip has high safety and reliability.
In the aspect of the service life of the LED, because the scheme that the LED lamp strips are all simultaneously lightened at ordinary times is adopted, the current of each lamp bead is halved, so that the LED lamp beads have lower tube voltage drop and heat productivity, the light attenuation is smaller, the service life is longer, and the purpose of prolonging the service life is realized.
The utility model discloses except adopting the basic control strategy through reducing LED junction temperature life-span, still adopted dual redundant drive and detection circuitry, when the lamp strip breaks down, still can normally work, this will increase substantially outdoor display life-span, has good selfreparing characteristic, can produce great economic value.
Further, S103 includes:
and detecting a first return current signal of the first redundant lamp bar and converting the first return current signal into a first return current value.
And detecting a second return current signal of the second redundant lamp bar and converting the second return current signal into a second return current value.
Under normal conditions, the first return current value is the same as the second return current value, and the sum of the first return current value and the second return current value is equal to the backlight driving constant current value.
Further, S104 includes:
and summing the first return current value and the second return current value.
If the sum of the first and second return current values is not equal to the backlight driving constant current value, it is determined that the dual redundant lamp set 5 has a fault.
Furthermore, if the sum of the first and second return current values is not equal to the backlight driving constant current value, the step of determining that the dual redundant lamp set 5 has a fault includes:
a preset current value is preset, under the normal condition, the preset current value of the first return current value is equal to the preset current value of the second return current value, and the sum of the preset current value of the first return current value and the preset current value of the second return current value is equal to the backlight driving constant current value.
If the first return current value is lower than the preset current value and the second return current value is lower than the preset current value, the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, and then the first redundant lamp strip and the second redundant lamp strip in the dual redundant lamp set are judged to be in failure.
If the first return current value is lower than the preset current value and the second return current value is equal to the preset current value, the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, and then the first redundant lamp bar in the dual redundant lamp set is judged to be in fault.
Or if the first return current value is equal to the preset current value and the second return current value is lower than the preset current value, the sum of the first return current value and the second return current value is not equal to the backlight driving constant current value, and then the second redundant lamp bar in the dual redundant lamp set is judged to be in fault.
Further, if there is a fault, the step of performing switching control on the dual redundant lamp set comprises:
and if the first redundant lamp strip and the second redundant lamp strip in the dual redundant lamp group both fail, performing odd-even switching control on the whole screen dual redundant lamp group.
And if the first redundant lamp strip in the double redundant lamp groups fails, performing odd-even switching control on the first redundant lamp strip in the adjacent double redundant lamp groups.
Or if the second redundant lamp strip in the dual redundant lamp group fails, performing odd-even switching control on the second redundant lamp strip in the adjacent dual redundant lamp group.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A redundant light bar driving circuit, comprising: a power supply conversion circuit; a back light drive controller; a light bar switch switching circuit; a current return circuit; the dual redundant lamp sets are respectively connected with the power supply conversion circuit, the lamp strip switch switching circuit and the current return circuit, and can control switching; the power conversion circuit is respectively connected with the backlight drive controller, the light bar switch switching circuit and the current return circuit, and the light bar switch switching circuit and the current return circuit are respectively connected with the backlight drive controller.
2. The redundant light bar driving circuit of claim 1, wherein the dual redundant light bank comprises: a first redundant light bar and a second redundant light bar; the positive electrode of the first redundant light bar is connected with a power conversion circuit, and the negative electrode of the first redundant light bar is connected with the light bar switch switching circuit; the second redundant lamp bar anode is arranged on a connecting line between the first redundant lamp bar anode and the power conversion circuit, and the second redundant lamp bar cathode is connected with the current return circuit.
3. The redundant light bar driver circuit of claim 2, wherein the power conversion circuit is connected to the backlight driver controller via a light bank drive current signal;
the light bar switch switching circuit is connected with the backlight drive controller through a first light bar enabling signal and a first testing current signal, and the first light bar enabling signal and the first testing current signal correspond to the first redundant light bar;
the current return test circuit is connected with the backlight drive controller through a second lamp bar enabling signal and a second return test current signal, and the second lamp bar enabling signal and the second return test current signal correspond to the second redundant lamp bar.
4. The redundant light bar drive circuit of claim 1, wherein the backlight drive controller is an ARM processor.
5. The redundant light bar driving circuit of claim 1, wherein the power conversion circuit comprises: a DCDC converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921324689.8U CN210245030U (en) | 2019-08-15 | 2019-08-15 | Redundant lamp strip drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921324689.8U CN210245030U (en) | 2019-08-15 | 2019-08-15 | Redundant lamp strip drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN210245030U true CN210245030U (en) | 2020-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921324689.8U Active CN210245030U (en) | 2019-08-15 | 2019-08-15 | Redundant lamp strip drive circuit |
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|---|---|
| CN (1) | CN210245030U (en) |
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