CN210442492U

CN210442492U - A testing arrangement for two-way TVS in LED lamp area

Info

Publication number: CN210442492U
Application number: CN201921134618.1U
Authority: CN
Inventors: 蔡明松
Original assignee: Hong Ting Tsai
Current assignee: Hong Ting Tsai
Priority date: 2019-07-18
Filing date: 2019-07-18
Publication date: 2020-05-01
Anticipated expiration: 2029-07-18

Abstract

A testing device for bidirectional TVS of an LED lamp strip comprises a fixed seat and a fixed frame positioned on one side of the fixed seat, wherein a groove body for placing the LED lamp strip is arranged on the fixed seat, a probe board which moves up and down under the action of a quick clamp is arranged on the fixed frame, a first switch and a second switch which control the positive and negative directions of a power supply and an indicating module which indicates a testing result are arranged on a panel of the fixed frame, a direct-current power supply interface which is connected with a direct-current power supply are also arranged on the fixed frame, a power supply positive and negative switching module and a signal receiving module are arranged in the fixed frame, when the probe board is conducted with the, the bidirectional TVS is in communication connection with the signal receiving module, the output end of the signal receiving module is in communication connection with the indicating module, the direct current output by the direct current source, the action of the positive and negative switching module of the power supply is controlled through the first switch and the second switch, and forward and reverse voltages are provided for the bidirectional TVS. Realize the test of two-way TVS on LED lamp area.

Description

A testing arrangement for two-way TVS in LED lamp area

Technical Field

The utility model relates to a LED lamp area test field, in particular to a two-way TVS's testing arrangement for LED lamp area.

Background

Currently, as the technology of manufacturing and packaging LED chips becomes mature, the cost of LED elements is greatly reduced, and LEDs are more and more widely used. The LED display screen has been rapidly developed with great attention paid to its advantages of high brightness, low operating voltage, low power consumption, large size, long life, impact resistance, stable performance, etc. The LED display screen is formed by connecting a plurality of LED lamp belts in series or in parallel, wherein the LED lamp belts are formed by assembling LED particles on a band-shaped FPC (flexible printed circuit) or PCB (printed circuit board).

In order to protect LED particles, a bidirectional TVS tube is generally connected in parallel to an LED light strip, and the bidirectional TVS tube is combined like two unidirectional TVS in a back-to-back manner, and both the positive and negative directions thereof have the same avalanche breakdown characteristic and clamping characteristic, and are not conducted under positive and negative voltages. When the existing LED lamp belt is tested, the bidirectional TVS on the LED lamp belt cannot be tested, and if the bidirectional TVS on the LED lamp belt is damaged, effective protection on LED particles is not performed. Therefore, a testing device for bidirectional TVS on LED strip is needed.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above disadvantages, an object of the present invention is to provide a testing device for testing a bidirectional TVS of a LED strip.

In order to achieve the above purpose, the utility model discloses a technical scheme is: the utility model provides a testing arrangement for a two-way TVS in LED lamp area, includes fixing base and the mount that is located fixing base one side, its characterized in that: the fixing base is provided with a groove body for placing the LED lamp strip, the fixing frame is provided with a probe plate which moves up and down under the action of a quick clamp, a panel of the fixing frame is provided with a first switch and a second switch for controlling the positive and negative directions of a power supply and an indicating module for indicating a test result, the fixing frame is further provided with a direct current power supply interface for connecting a direct current source, the fixing frame is internally provided with a positive and negative power supply switching module and a signal receiving module, when the probe plate is switched on with a bidirectional TVS of the LED lamp strip, the bidirectional TVS is in communication connection with the signal receiving module, the output end of the signal receiving module is in communication connection with the indicating module, direct current output by the direct current source acts through the positive and negative power supply switching module controlled by the first switch and the second switch, and the bidirectional TVS provides forward.

The beneficial effects of the utility model are that, LED lamp area is fixed on the fixing base, when the probe card switches on with LED lamp area under the quick-operation clamp effect, two-way TVS and signal reception module on the LED lamp area form the test circuit, through the action of the positive and negative switching module of first switch and second on-off control power, provide forward voltage and reverse voltage for two-way TVS respectively, signal reception module passes through the instruction module visual display on the panel with the testing result, can directly judge whether qualified two-way TVS on the LED lamp area.

Preferably, the power supply positive and negative switching module comprises a first relay and a second relay, one end of a coil of the first relay is connected with the first switch, and the other end of the coil of the first relay is connected with a normally closed contact of the first relay and a normally closed contact of the second relay; one end of a coil of the second relay is connected with the second switch, and the other end of the coil of the second relay is connected with the normally closed contact of the first relay and the normally closed contact of the second relay; the utility model discloses a two-way TVS's, including first relay, second relay, first switch, second switch and DC power supply, the public end of first relay is connected to two-way TVS's one end, and the public end of second relay is connected to the other end, the normally closed contact and the normally open contact of first relay, the normally closed contact and the normally open contact of second relay, first switch, second switch are connected with DC power supply. Positive and negative voltage output is realized by controlling the first relay and the second relay through the first switch and the second switch.

Preferably, the normally open contact of the first relay and the normally open contact of the second relay are connected with the positive electrode of the direct-current power supply, and the normally closed contact of the first relay and the normally closed contact of the second relay are connected with the negative electrode of the direct-current power supply.

Preferably, the signal receiving module includes a voltage comparator and a single chip, the positive phase input pin of the voltage comparator is used for being connected with the bidirectional TVS, the negative phase input pin of the voltage comparator is connected with the reference voltage, the output pin is connected with the input end of the single chip, and the output end of the single chip is connected with the indicating module. The comparator receives the voltage in the LED lamp belt loop to be detected, compares the voltage with the reference voltage, and transmits the obtained result to the single chip microcomputer.

Preferably, the indicating module includes LED pilot lamp and bee calling organ with singlechip output electric connection, the LED pilot lamp is double-colored pilot lamp. And the test result is visually displayed through the LED indicator lamp and the buzzer.

Preferably, the voltage comparator is of the type LM 393.

Preferably, the single chip microcomputer is 850C51 in model number.

Drawings

FIG. 1 is a schematic structural diagram of the present embodiment;

FIG. 2 is a functional diagram of the circuit of the present embodiment.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Referring to fig. 1-2, the bidirectional TVS10 is a combination of two unidirectional TVSs "back-to-back", the bidirectional TVS10 is non-conductive at both forward and reverse voltages, and if one of the unidirectional TVSs is turned on or broken down, the bidirectional TVS10 is conductive at either the forward or reverse voltage.

The utility model provides a testing arrangement for two-way TVS in LED lamp area, includes fixing base 1 and the mount 2 that is located 1 one side of fixing base, is provided with the cell body 11 that supplies the LED lamp area to place on the fixing base 1, is provided with the probe card 4 that reciprocates under the quick-operation clamp 3 effect on the mount 2, and probe card 4 shifts down when compressing tightly other probe pins in LED lamp area, switches on with two-way TVS. The panel of the fixing frame 2 is provided with a first switch 51 and a second switch 52 for controlling the positive and negative of the power supply and an indication module 6 for indicating the test result, and the fixing frame 2 is also provided with a direct current power supply interface for connecting a direct current source 7. The inside positive and negative switching module 8 of power and the signal reception module 9 that are provided with of mount 2, when the two-way TVS10 in probe card 4 and LED lamp area switched on, two-way TVS10 and signal reception module 9 communication connection, signal reception module 9 output and indicating module 6 communication connection, the direct current of direct current source 7 output, through first switch 51, the action of the positive and negative switching module 8 of second switch 52 control power, provide forward and reverse voltage for two-way TVS 10.

The power supply positive-negative switching module 8 comprises a first relay 81 and a second relay 82, wherein one end of a coil a1 of the first relay 81 is connected with the first switch 51, and the other end is connected with a normally closed contact c of the first relay 81 and a normally closed contact c of the second relay 82. The coil a1 of the second relay 82 has one end connected to the second switch 52 and the other end connected to the normally closed contact c of the first relay 81 and the normally closed contact c of the second relay 82. One end of the bidirectional TVS10 is connected to the common terminal a of the first relay 81, the other end is connected to the common terminal a of the second relay 82, the normally closed contact c and the normally open contact b of the first relay 81, the normally closed contact c and the normally open contact b of the second relay 82, and the first switch 51 and the second switch 52 are connected to the dc source 7. A normally open contact b of the first relay 81 and a normally open contact b of the second relay 82 are connected to the positive electrode of the dc source 7, and a normally closed contact c of the first relay 81 and a normally closed contact c of the second relay 82 are connected to the negative electrode of the dc source 7.

When the first switch 51 and the second switch 52 are fully released, there is no voltage across the bidirectional TVS 10. When the first switch 51 is pressed, the coil a1 of the first relay 81 is electrified and attracted, and the normally open contact b of the first relay 81 is conducted with the common terminal a, so as to provide a forward voltage for the bidirectional TVS 10. When the second switch 52 is pressed, the coil a1 of the second relay 82 is pulled in a point, and the normally open contact b of the second relay 82 is conducted with the common terminal a, so as to provide a reverse voltage for the bidirectional TVS 10.

The signal receiving module 9 comprises a voltage comparator 91 and a single chip microcomputer 92, wherein a positive phase input pin of the voltage comparator 91 is used for being connected with the bidirectional TVS10, a negative phase input pin of the voltage comparator 91 is connected with a reference voltage, an output pin of the voltage comparator is connected with an input end of the single chip microcomputer 92, and an output end of the single chip microcomputer 92 is connected with the indicating module 6. The reference voltage is zero and is grounded. The indicating module 6 comprises an LED indicating lamp 61 and a buzzer 62 which are electrically connected with the output end of the single chip microcomputer 92. The model of the voltage comparator 91 is LM393, and the model of the singlechip 92 is 850C 51.

When testing two-way TVS10, TVS10 both ends do not switch on under normal condition, and when first switch 51 and second switch 51 pressed, voltage comparator 91's forward input and reverse comparative voltage were 0V, and voltage comparator 91's output was the low-voltage this moment, transmitted to singlechip 92, and singlechip 92 received signal control LED pilot lamp 61 green light and is bright, shows that the product is qualified. If a single TVS of the bidirectional TVS10 breaks down or is reversely connected, the bidirectional TVS10 forms a path under a forward voltage or a reverse voltage, the voltage of the forward input end of the voltage comparator 91 is greater than 0V, the output of the voltage comparator 91 is a high voltage at the moment and is transmitted to the single chip microcomputer 92, and the single chip microcomputer 92 receives a signal to control the buzzer 62 to sound an alarm.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims

1. The utility model provides a testing arrangement for two-way TVS in LED lamp area, includes fixing base (1) and is located mount (2) of fixing base (1) one side, its characterized in that: the LED lamp strip fixing device is characterized in that a groove body (11) for placing an LED lamp strip is arranged on the fixing seat (1), a probe plate (4) moving up and down under the action of a quick clamp (3) is arranged on the fixing frame (2), a first switch (51) and a second switch (52) for controlling the positive and negative of a power supply and an indicating module (6) for indicating a test result are arranged on a panel of the fixing frame (2), a direct-current power supply interface for connecting a direct-current source (7) is further arranged on the fixing frame (2), a power supply positive and negative switching module (8) and a signal receiving module (9) are arranged inside the fixing frame (2), when the probe plate (4) is communicated with a bidirectional TVS (10) of the LED lamp strip, the bidirectional TVS (10) is in communication connection with the signal receiving module (9), the output end of the signal receiving module (9) is in communication connection with the indicating module (6), and direct current output by, the first switch (51) and the second switch (52) are used for controlling the action of the power supply positive and negative switching module (8) to provide forward and reverse voltages for the bidirectional TVS (10).

2. The testing device of the bidirectional TVS for LED strip according to claim 1, wherein: the power supply positive and negative switching module (8) comprises a first relay (81) and a second relay (82), one end of a coil of the first relay (81) is connected with the first switch (51), and the other end of the coil is connected with a normally closed contact of the first relay (81) and a normally closed contact of the second relay (82); one end of a coil of the second relay (82) is connected with the second switch (52), and the other end of the coil is connected with the normally closed contact of the first relay (81) and the normally closed contact of the second relay (82); one end of the bidirectional TVS (10) is connected with the public end of the first relay (81), the other end of the bidirectional TVS is connected with the public end of the second relay (82), and the normally closed contact and the normally open contact of the first relay (81), the normally closed contact and the normally open contact of the second relay (82), the first switch (51) and the second switch (52) are connected with the direct current source (7).

3. The testing device of the bidirectional TVS for LED strip according to claim 2, wherein: the normally open contact of first relay (81) and the normally open contact of second relay (82) are connected with the positive pole of direct current source (7), the normally closed contact of first relay (81) and the normally closed contact of second relay (82) are connected with the negative pole of direct current source.

4. The testing device of the bidirectional TVS for LED strip according to claim 1, wherein: the signal receiving module (9) comprises a voltage comparator (91) and a single chip microcomputer (92), wherein a positive phase input pin of the voltage comparator (91) is used for being connected with the bidirectional TVS (10), a negative phase input pin of the voltage comparator is connected with a reference voltage, an output pin of the voltage comparator is connected with the input end of the single chip microcomputer (92), and the output end of the single chip microcomputer (92) is connected with an indicating module (6).

5. The testing device of the bidirectional TVS for LED strip according to claim 4, wherein: the indicating module (6) comprises an LED indicating lamp (61) and a buzzer (62) which are electrically connected with the output end of the single chip microcomputer (92).

6. The testing device of the bidirectional TVS for LED strip according to claim 4, wherein: the model of the voltage comparator (91) is LM 393.

7. The testing device of the bidirectional TVS for LED strip according to claim 4, wherein: the model of the single chip microcomputer (92) is 850C 51.