LED load lamp panel for TV power panel backlight loop test

Abstract

The utility model discloses an LED load lamp panel for a TV power panel backlight loop test. The LED load lamp panel comprises a control assembly and a plurality of LED lamp strings connected with control pins of the control assembly. Each LED lamp string comprises more than two LED lamp groups which are sequentially connected in series, and two ends of each LED lamp group are respectively connected in parallel with one in-string switch loop; the in-string switch loops corresponding to the LED lamp groups of the same group of different LED lamp strings are connected to the same control pin of the control assembly; one end of each LED lamp string is connected with the anode switch loop; the other ends of every two adjacent LED lamp strings are connected through an inter-string switch loop. And the other end of each LED lamp string is used as an LED lamp string output end to be connected with the cathode of the LED power supply. According to the utility model, the serial-parallel demand is executed according to the actual demand, and each serial-parallel node adopts a relay to execute on-off. According to the utility model, the on-load requirements of backlight part detection of different power panels in the TV industry are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a TV equipment field especially relates to a LED load lamp panel for TV power panel backlight loop test. BACKGROUND

[0002] The original TV power panel backlight loop test simulation load is all metal resistance, cement resistance or matched LED lamp strip as load, in the power panel production process, because the machine type is many, the required matched resistance or matched lamp strip is also many, this leads to production work order switching and fixture control difficult and easy to make mistakes.

[0003] The power panel backlight loop simulation load cannot completely simulate the LED lamp load condition if using cement resistance or metal resistance, and is easy to fail. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of LED load lamp panels for TV power panel backlight loop test, according to actual different Panel, the voltage and current of LED lamp are set with load, satisfy the load demand of TV industry power panel backlight part detection.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A kind of LED load lamp panel for TV power panel backlight loop test, it includes a control assembly and the control pin connection of control assembly with several LED lamp strings;Each LED lamp string includes two or more than LED lamp groups that are connected in order, and the two ends of each LED lamp group are connected with one in-circuit switch respectively;The LED lamp group of same group of different LED lamp strings is connected to the same control pin of control assembly with corresponding in-circuit switch;One end of each LED lamp string is connected with positive switch circuit;The other end of two adjacent LED lamp strings is connected by inter-circuit switch;The other end of each LED lamp string is connected with LED power negative pole as LED lamp string output end;

[0007] The positive electrode switch circuit of the first LED light string comprises a first positive electrode switch unit; the positive electrode switch circuits of other LED light strings each comprise a first positive electrode switch unit and a second positive electrode switch unit; the switch control ends of the first positive electrode switch units of all LED light strings are electrically connected to corresponding pins of the first positive electrode control IC, the first ends of the first positive electrode switch units are connected to the positive electrode of the LED power supply, and the second ends of the first positive electrode switch units are connected to one end of the corresponding LED light string; the switch control ends of the second positive electrode switch units of all LED light strings are electrically connected to corresponding pins of the second positive electrode control IC, the first ends of the second positive electrode switch units are connected to the output end of the previous LED light string, and the second ends of the second positive electrode switch units are connected to one end of the corresponding LED light string; the switch control ends of the in-string switch circuits are electrically connected to corresponding pins of the in-string control IC, the first ends of the in-string switch circuits are connected to one end of the corresponding LED light group, and the second ends of the in-string switch circuits are connected to the other end of the corresponding LED light group; the switch control ends of the inter-string switch circuits are electrically connected to corresponding pins of the inter-string control IC, the first ends of the inter-string switch circuits are connected to the output end of the previous LED light string, and the second ends of the inter-string switch circuits are connected to the output end of the next LED light string; the switch control ends of each positive electrode switch circuit and inter-string switch circuit are connected to the positive electrode (VCC_5V) of the 5V power supply through respective protection resistors.

[0008] Further, the first positive electrode switch unit, the second positive electrode switch unit, the in-string switch circuit and the inter-string switch circuit comprise a relay switch, a MOS tube and a switch diode; the source of the MOS tube is grounded, the gate of the MOS tube serves as the switch control end; the gate of the MOS tube is connected to the ground through a switch resistor; the drain of the MOS tube is connected to the anode of the switch diode and one end of the control line of the relay switch; the cathode of the switch diode is connected to the other end of the control line of the relay switch and the 12V power supply; one end of the normally open switch of the relay switch serves as the first end of the corresponding switch unit or switch circuit; the other end of the normally open switch of the relay switch serves as the second end of the corresponding switch unit or switch circuit.

[0009] Further, the output end of each LED light string is connected to the corresponding pin on the input side of the cascade socket; the pins on the output side of the cascade socket are connected to the next level of LED load light plates.

[0010] Specifically, the LED output of each LED light string is connected to the LED negative electrode end of the jig through a 64-pin connector.

[0011] Further, the first positive electrode control IC, the second positive electrode control IC, the in-string control IC and the inter-string control IC each adopt a 51 single-chip microcomputer. The control assembly adopts an AVR single-chip microcomputer of Atmega 8.

[0012] Further, the control assembly is connected with a peripheral circuit, and the peripheral circuit comprises a clock circuit and an RS232 communication circuit.

[0013] Further, the voltage and current acquisition board is connected with the test PC.

[0014] Further, each LED lamp string comprises five LED lamp groups.

[0015] Further, each LED lamp group is formed by a different number of LED lamps connected in series.

[0016] Further, the number of LED lamps in each LED lamp group is sequentially increased according to the series connection order, and further, the number of LED lamps in each LED lamp group is sequentially increased according to the series connection order in multiples of 2, that is, the number of LED lamps in each LED lamp group satisfies 2n, wherein n is the order of the current LED lamp group in series connection.

[0017] Specifically, according to the above example, when each LED lamp string comprises five LED lamp groups, the number of LED lamps in the first LED lamp group is 1, the number of LED lamps in the second LED lamp group is 2, the number of LED lamps in the third LED lamp group is 4, and so on, and the number of LED lamps in the fifth LED lamp group is 16.

[0018] The utility model discloses the above technical scheme, adopt with TV backlight strip's LED lamp as load, can be really analog TV backlight load, parallel 8 string LED lamp, single string bears 0.6A, maximum bearing 4.8A current. Single string series connection 31 LED lamps (single lamp voltage drop 3V3), adopt binary control string into the number of lamps of backlight loop to control voltage demand. The utility model discloses a Atmega 8 IC as control assembly, and PC sends the command to general LED load lamp board through the serial port, and according to actual demand, executes series and parallel demand. Each series and parallel node adopts relay to execute on-off. The utility model discloses according to actual different Panel, set up LED lamp's load voltage and current, satisfy TV industry power board backlight part detection's load demand. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further explained in detail in combination with the drawings and specific embodiments;

[0020] Figure 1 It is the principle architecture schematic view of the utility model for TV power board backlight loop test's LED load lamp board;

[0021] Figure 2 It is the circuit principle schematic view of the utility model power board;

[0022] Figure 3The utility model discloses the circuit principle schematic drawing of control assembly and control IC part;

[0023] Figure 4 The utility model discloses the connection principle schematic drawing of part light string of LED light string;

[0024] Figure 5 The utility model discloses the wiring schematic drawing of anode switch circuit of first LED light string;

[0025] Figure 6 The utility model discloses the wiring schematic drawing of anode switch circuit of other LED light string;

[0026] Figure 7 The utility model discloses the principle schematic drawing of switch circuit in string;

[0027] Figure 8 The utility model discloses the principle schematic drawing of switch circuit between strings. Specific implementation

[0028] In order to make the purpose, technical scheme and advantage of the embodiment of the application more clear, the technical scheme in the embodiment of the application will be clearly and completely described below in conjunction with the drawings in the embodiment of the application.

[0029] As Figures 1 to 8 The utility model discloses a kind of LED load lamp panel for TV power panel backlight loop test, it includes a control assembly and the control pin connection of several LED light strings with control assembly;Each LED light string includes two or more than LED lamp group that successively connect in series, the both ends of each LED lamp group respectively connect one switch circuit in string;The LED lamp group of same group of different LED light strings is connected to the same control pin of control assembly with corresponding switch circuit in string;One end of each LED light string connects anode switch circuit;The other end between two adjacent LED light strings is connected by switch circuit between strings;The other end of each LED light string is connected LED power negative pole as LED light string output end;

[0030] The anode switch circuit of the first LED light string comprises a first anode switch unit; the anode switch circuits of other LED light strings each comprise a first anode switch unit and a second anode switch unit; the switch control ends of the first anode switch units of all LED light strings are electrically connected to corresponding pins of a first anode control IC respectively, the first ends of the first anode switch units are connected to the anodes of LED power supplies, and the second ends of the first anode switch units are connected to one end of a corresponding LED light string; the switch control ends of the second anode switch units of all LED light strings are electrically connected to corresponding pins of a second anode control IC respectively, the first ends of the second anode switch units are connected to the output ends of previous LED light strings, and the second ends of the second anode switch units are connected to one end of a corresponding LED light string; the switch control ends of the in-string switch circuits are electrically connected to corresponding pins of an in-string control IC respectively, the first ends of the in-string switch circuits are connected to one end of a corresponding LED light group, and the second ends of the in-string switch circuits are connected to the other end of the corresponding LED light group; the switch control ends of the inter-string switch circuits are electrically connected to corresponding pins of an inter-string control IC respectively, the first ends of the inter-string switch circuits are connected to the output ends of previous LED light strings, and the second ends of the inter-string switch circuits are connected to the output ends of next LED light strings; the switch control ends of each anode switch circuit and inter-string switch circuit are connected to the anode (VCC_5V) of a 5V power supply through respective protection resistors.

[0031] Further, the first anode switch unit, the second anode switch unit, the in-string switch circuit and the inter-string switch circuit comprise a relay switch, a MOS tube and a switch diode; the source of the MOS tube is grounded, the gate of the MOS tube serves as a switch control end; the gate of the MOS tube is connected to the ground through a switch resistor; the drain of the MOS tube is connected to one end of a control line of the relay switch and the anode of the switch diode respectively; the cathode of the switch diode is connected to the other end of the control line of the relay switch and a 12V power supply respectively; one end of the normally open switch of the relay switch serves as the first end of the corresponding switch unit or switch circuit; the other end of the normally open switch of the relay switch serves as the second end of the corresponding switch unit or switch circuit.

[0032] Specifically, as shown in Figure 1 the utility model discloses a power board provides 5V power supply and 12V power supply.

[0033] Further, the output end of each LED light string is connected to corresponding pins on the input side of a cascade socket; the pins on the output side of the cascade socket are connected to the LED load lamp board of the next stage. If the component voltage is lower than 102V, Ledoutput1~8 is directly connected to the jig through the contact pin, and the jig is directly connected to the LED- of the voltage board. If the voltage is higher than 102V~204V, Ledoutput2, 4, 6, 8 is connected to the jig, and then connected to the LED- of the power board. If the voltage is higher than 204V, Ledoutput3, 6 is connected to the LED- of the power board through the jig.

[0034] Further, the first positive electrode control IC, the second positive electrode control IC, the string control IC and the inter-string control IC all adopt 51 single-chip microcomputer. The control assembly adopts AVR single-chip microcomputer of Atmega 8.

[0035] Further, the control assembly is connected with peripheral circuit, and the peripheral circuit includes clock circuit and RS232 communication circuit. The control assembly is connected with the test PC through RS232 communication.

[0036] Further, the voltage and current acquisition board is connected with the test PC.

[0037] Further, each LED lamp string includes five LED lamp groups.

[0038] Further, each LED lamp group is formed by LED lamps in series in different numbers.

[0039] Further, the number of LED lamps in each LED lamp group is increased in series according to the series order. Further, the number of LED lamps in each LED lamp group is increased in series according to the series order in multiples of 2, that is, the number of LED lamps in each LED lamp group satisfies n, where n is the order of the current LED lamp group in series.

[0040] Specifically, according to the above example, when each LED lamp string includes five LED lamp groups, the number of LED lamps in the first LED lamp group is 1, the number of LED lamps in the second LED lamp group is 2, the number of LED lamps in the third LED lamp group is 4, and so on, and the number of LED lamps in the fifth LED lamp group is 16.

[0041] When the voltage is more than 102V and less than 204V, LED lamp string 1 and LED lamp string 2 are connected in series to form string 1, LED lamp string 3 and LED lamp string 4 are connected in series to form string 2, LED lamp string 5 and LED lamp string 6 are connected to form string 3, and LED lamp string 7 and LED lamp string 8 are connected to form string 4. Meanwhile, string 1, 2, 3 and 4 are determined whether to be connected in parallel according to actual current demand, that is, LEDoutput1, LEDoutput3, LEDoutput5 and LEDoutput7 are not connected to the needle, and the corresponding output ends LEDoutput2, 4, 6 and 8 are connected to the negative pole (jig power board LED-) of the LED power supply. When the voltage is more than 204V, LED lamp string 1, 3 and 5 are connected in series to form string 1, and LED lamp string 2, 4 and 6 are connected in series to form string 2, that is, LEDoutput1, 2, 4, 5, 6 and 8 are not connected to the needle, and the output is from LEDoutput3 and 7 to the jig voltage board to meet the voltage of more than 240V. The utility model adopts multiple parallel connection, but is limited by the size of the lamp panel, and only 8 LED lamp strings can be arranged on a general lamp panel, and the current of a single panel can only bear 2.4A, which cannot meet the demand of part of the machine type, so a 64pin is led to the next general lamp panel for expansion.

[0042] The utility model adopts the above technical scheme, adopts the LED lamp as the load of TV backlight lamp strip, can really simulate the TV backlight load, 8 LED lamp strings are connected in parallel, a single string can bear 0.6A current, and can bear 4.8A current at most. 31 LED lamps (single lamp voltage drop 3V3) are connected in series in a single string, the number of lamps connected in the backlight loop is controlled by binary control to control the voltage demand. The utility model adopts multiple parallel connection, but is limited by the size of the lamp panel, and only 8 strings can be arranged on a general lamp panel, and the current of a single panel can only bear 2.4A, which cannot meet the demand of part of the machine type, so a 64pin is led to the next general lamp panel for expansion. The utility model adopts an Atmega 8 IC as a control assembly, a PC sends a command to the general LED load lamp panel through a serial port, and the string and parallel demand are executed according to actual demand. A relay is used at each string and parallel node to execute on-off. The utility model sets the load voltage and current of the LED lamp according to different panels, and meets the load demand of the backlight part of the TV industry power board.

[0043] It is apparent that the described embodiments are only some — but not all — of the embodiments of the present application. The embodiments described in this application and features in the embodiments can be combined with each other in cases without conflict. The components of the embodiments of the present application, which are generally described and shown in the accompanying drawings, can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work, shall fall within the scope of protection of the present application.

Claims

1. An LED load panel for TV power board backlight loop testing, characterized in that: It includes a control assembly and a plurality of LED light strings connected with control pins of the control assembly; each LED light string includes two or more LED light groups connected in series, and each LED light group has two ends connected with a corresponding in-string switch circuit; the LED light groups of the same group in different LED light strings are connected with the same control pin of the control assembly; one end of each LED light string is connected with a positive switch circuit; the other ends of two adjacent LED light strings are connected through an inter-string switch circuit; the other end of each LED light string is connected with an LED power supply negative pole as an LED light string output end; The positive switch circuit of the first LED light string includes a first positive switch unit; the positive switch circuits of other LED light strings each include a first positive switch unit and a second positive switch unit; the switch control ends of the first positive switch units of all LED light strings are respectively connected with corresponding pins of a first positive control IC, the first ends of the first positive switch units are connected with an LED power supply positive pole, and the second ends of the first positive switch units are connected with one end of a corresponding LED light string; the switch control ends of the second positive switch units of all LED light strings are respectively connected with corresponding pins of a second positive control IC, the first ends of the second positive switch units are connected with an output end of a previous LED light string, and the second ends of the second positive switch units are connected with one end of a corresponding LED light string; the switch control ends of the in-string switch circuits are respectively connected with corresponding pins of an in-string control IC, the first ends of the in-string switch circuits are connected with one end of a corresponding LED light group, and the second ends of the in-string switch circuits are connected with the other end of the corresponding LED light group; the switch control ends of the inter-string switch circuits are respectively connected with corresponding pins of an inter-string control IC, the first ends of the inter-string switch circuits are connected with the output end of the previous LED light string, and the second ends of the inter-string switch circuits are connected with the output end of a next LED light string; the switch control ends of each positive switch circuit and inter-string switch circuit are respectively connected with a 5V power supply positive pole through a corresponding protection resistor.

2. The LED load panel for TV power board backlight loop test according to claim 1, wherein: The first positive switch unit, the second positive switch unit, the in-string switch circuit and the inter-string switch circuit include a relay switch, a MOS tube and a switch diode; the source of the MOS tube is connected with the ground, the gate of the MOS tube is used as a switch control end, the gate of the MOS tube is connected with the ground through a switch resistor, the drain of the MOS tube is respectively connected with the anode of the switch diode and one end of a control line of the relay switch, the cathode of the switch diode is connected with the other end of the control line of the relay switch and a 12V power supply, and one end of the normally open switch of the relay switch is used as the first end of the corresponding switch unit or switch circuit, and the other end of the normally open switch of the relay switch is used as the second end of the corresponding switch unit or switch circuit.

3. The LED load panel for TV power board backlight loop test according to claim 1, wherein: The output end of each LED light string is connected with a corresponding pin of an input side of a cascade socket; the pins of an output side of the cascade socket are connected with a next level LED load lamp panel.

4. An LED load lamp board for testing the backlight circuit of a TV power board according to claim 1, characterized in that: The first positive control IC, the second positive control IC, the in-string control IC and the inter-string control IC all use a 51 single-chip microcomputer; and the control assembly uses an AVR single-chip microcomputer of Atmega 8.

5. The LED load panel for TV power board backlight loop test according to claim 1, wherein: The control assembly is connected with a peripheral circuit, and the peripheral circuit comprises a clock circuit and an RS232 communication circuit.

6. The LED load panel for TV power board backlight loop test according to claim 1, wherein: The voltage and current collection board is connected with the test PC.

7. The LED load panel for TV power board backlight loop test according to claim 1, wherein: Each LED light string comprises five LED light groups.

8. The LED load panel for TV power board backlight loop test according to claim 1, wherein: Each LED light group is formed by connecting different numbers of LED lights in series.

9. The LED load panel for TV power board backlight loop test according to claim 1, wherein: The number of LED lights in each LED light group is sequentially increased in series order.

10. The LED load panel for TV power board backlight loop test according to claim 9, wherein: The number of LED lights in each LED light group is sequentially increased in series order by a factor of 2, that is, the number of LED lights in each LED light group satisfies n, wherein n is the sequential order when the current LED light group is connected in series.

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