CN209964345U

CN209964345U - Programmable LED load circuit

Info

Publication number: CN209964345U
Application number: CN201920666206.6U
Authority: CN
Inventors: 程家凡; 戴键; 董云鹏; 毛昭祺
Original assignee: Hangzhou Youte Power Co Ltd
Current assignee: Hangzhou Youte Power Co Ltd
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-01-17
Anticipated expiration: 2029-05-10

Abstract

The utility model discloses a LED load circuit able to programme, its technical scheme main points are including relay, triode, controller and the minimum module of LED, the base of triode is connected to the output of controller, the minimum module of LED is provided with a plurality ofly, all sets up the relay connection between the minimum module of two adjacent LEDs, and the coil of every relay all corresponds and sets up the triode, switches on through controller trigger triode for the coil through triode trigger relay switches on. The utility model discloses can reduce the lamp plate specification, promote efficiency of software testing, need not loaded down with trivial details wiring and operation and can accomplish the test of taking the lamp of different models of LED driver, different loads.

Description

Programmable LED load circuit

Technical Field

The utility model relates to a LED detects, and more specifically the theory that says so, it relates to a LED load circuit able to programme.

Background

In the LED driving power supply industry, the lamp test is an indispensable test project from research, development and design to batch production, the traditional lamp test method is a lamp plate adapted to each LED driver with different models, and because the output specifications of the LED drivers are various, the drivers with different powers, currents and voltages can hardly share the lamp plate, so that the test lamp plate must be equipped for each specification driver, and the enterprise material and management cost are increased.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a can change drive power circuit and be used for the LED load circuit able to programme in detection lamp area.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a LED load circuit able to programme, includes relay, triode, controller and the minimum module of LED, the base of triode is connected to the output of controller, the minimum module of LED is provided with a plurality ofly, all sets up the relay connection between the minimum module of two adjacent LED, and the coil of every relay all corresponds and sets up the triode, switches on through controller trigger triode for the coil through triode trigger relay switches on.

The utility model discloses further set up to: the relay is a double-pole double-throw relay, between two adjacent minimum LED modules, one minimum LED module is connected in series between two fixed point ends of the double-pole double-throw relay, the other minimum LED module is connected in series between two normally open contacts of the double-pole double-throw relay, and a normally closed contact connected with a negative end of the minimum LED module on the double-pole double-throw relay is connected in series with a normally open contact connected with a positive end of the minimum LED module on the double-pole double-throw relay through a wire.

The utility model discloses further set up to: the load circuit further comprises a pull-up resistor, each triode is correspondingly connected in series with the pull-up resistor, an external power supply is input into one end of the pull-up resistor, the other end of the pull-up resistor is connected with the collector electrode of the corresponding triode, and the emitter electrode of each triode is connected in series with the coil of the corresponding double-pole double-throw relay and then grounded.

The utility model discloses further set up to: the load circuit further comprises a keyboard and a display screen, the keyboard is connected with the input end of the controller, the driving end of the display screen is connected with the output end of the controller, the controller is subjected to parameter setting through the keyboard, and the detection and parameter setting information of the load circuit is displayed through the display screen.

The utility model discloses further set up to: the controller is an MCU processor.

The utility model has the advantages of that: the complex manual wiring procedure is omitted, and the complex series-parallel connection of the circuits is realized by adopting an MCU control relay switching mode;

before testing, specification parameters of a driver to be tested need to be input, and the MCU can automatically adjust the load serial-parallel connection structure and power according to the input parameters, so that the programmable LED load function is finally realized.

The lamp plate specification that uses this device can significantly reduce promotes efficiency of software testing, need not loaded down with trivial details wiring and operation and can accomplish the test of taking the lamp of different models, different loads of LED driver.

Drawings

Fig. 1 is a schematic diagram of the serial-parallel connection of minimum LED modules according to the present invention;

FIG. 2 is a schematic diagram of the multi-stage LED series-parallel connection of the present invention;

fig. 3 is a system block diagram of the present invention.

Detailed Description

Referring to fig. 1 to 3, the programmable LED load circuit of this embodiment includes relay, triode, controller and the minimum module of LED (the minimum module of LED is the load module of LED lamp pearl for the display operation in the lamp area test process), the base of triode is connected to the output of controller, the minimum module of LED is provided with a plurality ofly, all sets up the relay connection between two adjacent minimum modules of LED, and the coil of every relay all corresponds and sets up the triode, switches on through controller trigger triode for the coil through triode trigger relay switches on.

As shown in fig. 1, the relay is a double-pole double-throw relay, between two adjacent minimum LED modules, one of the minimum LED modules is connected in series between two fixed-point ends of the double-pole double-throw relay, the other minimum LED module is connected in series between two normally open contacts of the double-pole double-throw relay, and a normally closed contact connected with a negative end of the minimum LED module on the double-pole double-throw relay is connected in series with a normally open contact connected with a positive end of the minimum LED module on the double-pole double-throw relay through a wire.

101. A double-pole double-throw relay switch a is fixed; 102. a normally closed point of a double-pole double-throw relay switch a; 103. a normally-on point of a double-pole double-throw relay switch a; 201. a double-pole double-throw relay switch b is fixed; 202. a normally closed point of a double-pole double-throw relay switch b; 203. a normally-on point of a double-pole double-throw relay switch b; LED minimum module 1; 302. LED minimum module 2.

The principle of the series-parallel connection of the minimum LED modules is as follows:

301 and 302 are two minimum modules of LEDs connected by a double pole double throw relay

1. When 101 and 102 are closed and 201 and 202 are closed, the negative terminal 301 is connected with the positive terminal 302, i.e. two LEDs are connected in series.

2. When 101 and 103 are closed and 201 and 203 are closed, the 301 positive terminal is connected with the 302 positive terminal, and the 301 negative terminal is connected with the 302 negative terminal, i.e. two LEDs are connected in parallel.

As shown in fig. 2, the multi-stage LED series-parallel principle:

every 2 LED modules are connected by a relay, series connection or parallel connection between adjacent modules can be realized by changing the opening and closing states of the relays, the system adopts a logic design of 'parallel connection and series connection', and if 10 LED modules exist, 2 parallel connection and 5 series connection are realized, and only the 1 st relay, the 3 rd relay, the 5 th relay, the 7 th relay and the 9 th relay need to be attracted; the 2 nd relay, the 4 th relay, the 6 th relay and the 8 th relay are not attracted, 2 parallel 5 series are finally realized through the state change of the relays, and other series-parallel combinations also control the relays according to the principle.

The load circuit further comprises a pull-up resistor, each triode is correspondingly connected in series with the pull-up resistor, an external power supply is input into one end of the pull-up resistor, the other end of the pull-up resistor is connected with the collector electrode of the corresponding triode, and the emitter electrode of each triode is connected in series with the coil of the corresponding double-pole double-throw relay and then grounded.

The load circuit further comprises a keyboard and a display screen, the keyboard is connected with the input end of the controller, the driving end of the display screen is connected with the output end of the controller, the controller is subjected to parameter setting through the keyboard, and the detection and parameter setting information of the load circuit is displayed through the display screen. The controller is an MCU processor.

As shown in fig. 3, the system operating principle:

1. a number key; 2. a liquid crystal display screen; 3. a data display bus; 4, MCU master controller; 5. a drive signal bus; the LED load series-parallel module; 7. a key data bus.

The power and the current and the voltage of a driver to be tested are input through a keyboard, a system can calculate the number of lamp beads required to be connected in series and in parallel according to received parameters, and the calculation principle is that the VF voltage of the LED lamp beads under rated current is a fixed value, and the VF fluctuation is very small along with the current, so that the number of the lamp beads connected in series can be calculated according to output voltage; the number of the parallel connection depends on the current, each lamp bead has equal current, the number of the lamp beads required to be connected in parallel can be calculated according to the rated current value of the lamp beads, and the decimal is uniformly rounded when the decimal is calculated.

Through adopting above-mentioned technical scheme, use this device circuit, can set up LED load size according to being surveyed power output specification, this device carries out series, parallelly connected with minimum LED lamp pearl load module through the relay. The relay coil is controlled by a drive circuit consisting of a pull-up resistor and a triode to be switched on or off, and the base electrodes of all the triodes are finally connected together by a bus and an MCU (single chip microcomputer), so that the MCU can realize the switching on and off of any relay in the circuit, and further realize the random series-parallel connection between the minimum LED lamp bead load modules.

The device realizes man-machine interaction through a keyboard and a display screen, specification parameters of a driver to be tested need to be input before testing, and the MCU can automatically adjust the serial-parallel connection structure and the power of a load according to the input parameters, so as to finally realize the programmable LED load function.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A programmable LED load circuit, characterized by: including relay, triode, controller and the minimum module of LED, the base of triode is connected to the output of controller, the minimum module of LED is provided with a plurality ofly, all sets up the relay between the minimum module of two adjacent LED and connects, and the coil of every relay all corresponds and sets up the triode, switches on through controller trigger triode for the coil through triode trigger relay switches on.

2. A programmable LED load circuit according to claim 1, wherein: the relay is a double-pole double-throw relay, between two adjacent minimum LED modules, one minimum LED module is connected in series between two fixed point ends of the double-pole double-throw relay, the other minimum LED module is connected in series between two normally open contacts of the double-pole double-throw relay, and a normally closed contact connected with a negative end of the minimum LED module on the double-pole double-throw relay is connected in series with a normally open contact connected with a positive end of the minimum LED module on the double-pole double-throw relay through a wire.

3. A programmable LED load circuit according to claim 2, wherein: the load circuit further comprises a pull-up resistor, each triode is correspondingly connected in series with the pull-up resistor, an external power supply is input into one end of the pull-up resistor, the other end of the pull-up resistor is connected with the collector electrode of the corresponding triode, and the emitter electrode of each triode is connected in series with the coil of the corresponding double-pole double-throw relay and then grounded.

4. A programmable LED load circuit according to claim 1, wherein: the load circuit further comprises a keyboard and a display screen, the keyboard is connected with the input end of the controller, the driving end of the display screen is connected with the output end of the controller, the controller is subjected to parameter setting through the keyboard, and the detection and parameter setting information of the load circuit is displayed through the display screen.

5. A programmable LED load circuit according to claim 1, wherein: the controller is an MCU processor.