CN212324425U

CN212324425U - Protection control circuit of LED lamp

Info

Publication number: CN212324425U
Application number: CN202021221054.8U
Authority: CN
Inventors: 钟玲祥; 江琦; 余彬; 李阳
Original assignee: Zhejiang Yankon Group Co Ltd; Zhejiang Yankon Mega Lighting Co Ltd
Current assignee: Zhejiang Yankon Urban Lighting Engineering Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-01-08
Anticipated expiration: 2030-06-28

Abstract

A protection control circuit of an LED lamp belongs to the technical field of LED lamps. The utility model discloses a constant current drive circuit, parallel connection are at the multichannel LED load of constant current drive circuit output, with the detection circuitry of LED load output series connection, control circuit and the on-off controller that links to each other with constant current drive circuit, every detection circuitry's output all the way all links to each other with control circuit, every detection circuitry's another way output interconnect, and the common port links to each other with on-off controller, and on-off controller and control circuit link to each other. The utility model discloses in, through connect protection control circuit on constant current drive circuit and parallel connection's multichannel LED load with it, when all the way or multichannel LED load became invalid, can make several LED load disconnections of surplus, protect the LED load, perhaps export a less electric current and make several LED load of surplus normally work.

Description

Protection control circuit of LED lamp

Technical Field

The utility model belongs to the technical field of the LED lamp, specifically be a protection control circuit who relates to a LED lamp.

Background

LED lamps are gradually replacing traditional incandescent and fluorescent lamps due to their high efficiency, environmental protection, and energy conservation. With the popularization of LED lamps and the increasing power of LED lamps, multiple LED loads are often connected in parallel to the output terminal of an LED driving power supply. The conventional driving power supply generally adopts constant voltage driving or constant current driving, when the constant voltage driving is used, one or more sampling resistors are connected in series on each path of LED load, because the VF value of an LED lamp bead can change under the influence of temperature, the VF value is high when the temperature is low, and the VF value is low when the temperature is high, especially when more LED lamp beads are connected in series on each path of LED load of a high-power LED lamp, the difference of the total VF value along with the temperature change is large, and when the lighting temperature is high, the total VF value is small, so that the voltage values at two ends of each sampling resistor are increased, and the power supply efficiency is reduced; when the constant-current driving is used, the output current of each path of LED load is constant, the LED lamp bead VF value is not influenced, and meanwhile, the sampling resistor does not need to be connected in series, so that the power supply efficiency is higher. In view of the above, the driving power supply usually uses constant current driving, but in the using process, when one or more LED loads connected in parallel fail, the current on the original LED load is loaded on the remaining LED loads, which causes the heating of the LED loads to increase, so that on one hand, the service lives of the remaining LED loads are reduced, and on the other hand, if the heat cannot be dissipated in time and the temperature is too high, part of driving components will fail or reach the ignition point of part of plastic parts, which causes potential safety hazard or fire risk.

Disclosure of Invention

The utility model discloses solve the technical problem that above-mentioned prior art exists, provide a protection control circuit of LED lamp.

The above technical problem of the present invention can be solved by the following technical solutions: a protection control circuit of an LED lamp comprises a constant current driving circuit, a plurality of paths of LED loads connected to the output end of the constant current driving circuit in parallel, detection circuits connected with the output end of the LED loads in series, a control circuit and a switch controller connected with the constant current driving circuit, wherein one path of output end of each detection circuit is connected with the control circuit, the other path of output end of each detection circuit is connected with each other, a common end of each detection circuit is connected with the switch controller, and the switch controller is connected with the control circuit.

Preferably, the detection circuit is a sampling resistor or a current detection chip.

Preferably, the control circuit is a control chip or a single chip microcomputer.

Preferably, the switch controller is a transistor, or a triode, or a MOS transistor.

The utility model provides another technical scheme does:

a protection control circuit of an LED lamp comprises a constant current driving circuit, a plurality of paths of LED loads connected to the output end of the constant current driving circuit in parallel, a detection circuit connected with the output end of the LED loads in series, and a control circuit connected with the constant current driving circuit.

Preferably, the control circuit is a control chip, or a current limiter, or a single chip microcomputer, or a comparative analysis circuit.

The utility model discloses beneficial effect who has: by connecting the protection control circuit on the constant current driving circuit and the multiple paths of LED loads connected in parallel with the constant current driving circuit, when one or more paths of LED loads fail, the rest paths of LED loads can be disconnected to protect the LED loads, or a smaller current is output to enable the rest paths of LED loads to work normally.

Drawings

Fig. 1 is a block diagram of a first embodiment of the present invention;

fig. 2 is a circuit diagram of a first embodiment of the present invention;

fig. 3 is a block diagram of a second embodiment of the present invention;

fig. 4 is a circuit diagram of a second embodiment of the present invention.

In the figure: 1. a constant current drive circuit; 2. an LED load; 3. a detection circuit; 4. a control circuit; 5. a switch controller.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

Example 1: a protection control circuit of an LED lamp is shown in figures 1-2 and comprises a constant current driving circuit 1, a plurality of LED loads 2 connected to the output end of the constant current driving circuit 1 in parallel, a detection circuit 3 connected with the output end of the LED loads 2 in series, a plurality of control circuits 4 and a switch controller 5 connected with the constant current driving circuit 1, wherein the detection circuits 3 are provided with two output ends, one output end of each detection circuit 3 is connected with the control circuit 4, the other output end of each detection circuit 3 is connected with each other, the common end of each detection circuit is connected with the switch controller 5, and the switch controller 5 is connected with the control circuit 4.

The detection circuit 3 is a sampling resistor or a current detection chip; the control circuit 4 is a control chip or a singlechip; the switch controller 5 is a transistor, a triode or an MOS tube.

When the LED lamp normally works, the current output by the constant current driving circuit 1 is output to the control circuit 4 through the LED loads 2 connected in parallel in multiple paths and the detection circuits 3 connected in series with the LED loads 2 respectively, and the control circuit 4 outputs high level to enable the switch controller 5 to be conducted, so that the LED loads 2 connected in parallel in multiple paths are normally lightened to work. When one or more LED loads 2 are disconnected, the detection circuit 3 connected with the rest LED loads 2 outputs current to the control circuit 4, the control circuit 4 outputs low level to cut off the switch controller 5, so that all the LED loads 2 connected in parallel are not lightened, and the phenomenon that the current on the LED load 2 working normally is increased due to faults, the service life of the LED load 2 is influenced, or potential safety hazards are generated is avoided.

Specifically, when the detection circuit 3 adopts a sampling resistor, the detection circuit comprises a sampling resistor R1, a sampling resistor R2 and a sampling resistor R3, when the control circuit 4 adopts a single chip microcomputer, the control circuit comprises a single chip microcomputer U1, the single chip microcomputer U1 has 9 pins, when the switch controller 5 adopts a triode, the switch controller comprises a triode Q1, the output end of the constant current driving circuit 1 is connected in parallel with three paths of LED loads 2, the sampling resistor R1 is connected in series with the output end of the first path of LED load 2, the sampling resistor R2 is connected in series with the output end of the second path of LED load 2, the sampling resistor R3 is connected in series with the output end of the third path of LED load 2, the output ends of the sampling resistor R1, the sampling resistor R2 and the sampling resistor R3 are connected with each other, the common end is connected with the collector electrode of the triode Q1, the first pin and the ninth pin of the single chip microcomputer U1 are respectively connected with, the voltage detection circuit is used for detecting voltages at two ends of a sampling resistor R1, a second pin and an eighth pin of the single chip microcomputer U1 are respectively connected with two ends of a sampling resistor R2 and used for detecting voltages at two ends of a sampling resistor R2, a third pin and a seventh pin of the single chip microcomputer U1 are respectively connected with two ends of a sampling resistor R3 and used for detecting voltages at two ends of a sampling resistor R3, a fourth pin of the single chip microcomputer U1 is a power supply pin and connected with a power supply end of the circuit, a fifth pin of the single chip microcomputer U1 is grounded, a sixth pin of the single chip microcomputer U1 is connected with a base electrode of a triode Q1, and an emitting electrode of the triode Q1 is respectively connected with the constant current driving circuit 1 and the ground. During normal work, the singlechip U1 detects the voltage on sampling resistor R1, sampling resistor R2 and sampling resistor R3, and the sixth pin output high level of singlechip U1 makes triode Q1 switch on, and three routes LED load 2 normally works. When one or two LED loads 2 are disconnected, the single chip microcomputer U1 only detects the voltage of the sampling resistors on the remaining LED loads 2, the sixth pin of the single chip microcomputer U1 outputs low level, the triode Q1 is cut off, and therefore the whole circuit does not work.

Example 2: as shown in fig. 3-4, another technical solution provided by the present invention is:

the utility model provides a protection control circuit of LED lamp, includes constant current drive circuit 1, parallel connection at the multichannel LED load 2 of constant current drive circuit 1 output, the detection circuitry 3 of establishing ties with LED load 2 output and the control circuit 4 that links to each other with constant current drive circuit 1, detection circuitry 3 is equipped with a plurality ofly, detection circuitry 3 is equipped with two way outputs, every detection circuitry 3 all is linked to each other with control circuit 4 all the output of the same kind, every detection circuitry 3 another way output interconnect, its common terminal links to each other with constant current drive circuit 1.

The detection circuit 3 is a sampling resistor or a current detection chip; the control circuit 4 is a control chip, or a current limiter, or a singlechip, or a comparison and analysis circuit.

When the LED constant current driving circuit works normally, the control circuit 4 outputs a first control signal to the constant current driving circuit 1, and the constant current driving circuit 1 outputs current A to the multiple paths of LED loads 2 connected in parallel to enable the LED loads to work normally. When one or more LED loads 2 are disconnected, the detection circuit 3 connected with the rest of the LED loads 2 outputs current to the control circuit 4, the control circuit 4 outputs a second control signal to the constant current driving circuit 1, and the constant current driving circuit 1 outputs current B (the current B is less than the current A) to the rest of the LED loads 2 connected in parallel to enable the LED loads to work normally.

Specifically, when the detection circuit 3 adopts a sampling resistor, the detection circuit comprises a sampling resistor R4, a sampling resistor R5 and a sampling resistor R6, the control circuit 4 adopts a single chip microcomputer, the control circuit comprises a single chip microcomputer U2, the single chip microcomputer U2 has 9 pins, the output end of the constant current drive circuit 1 is connected in parallel with three paths of LED loads 2, the sampling resistor R4 is connected in series with the output end of the first path of LED load 2, the sampling resistor R5 is connected in series with the output end of the second path of LED load 2, the sampling resistor R6 is connected in series with the output end of the third path of LED load 2, the output ends of the sampling resistor R4, the sampling resistor R5 and the sampling resistor R6 are connected with each other, and the common ends are respectively connected with the constant current drive circuit 1 and the ground, the first pin and the ninth pin of the single chip microcomputer U2 are respectively connected with the two ends of the sampling resistor R4 for detecting the voltage at the two ends of the sampling resistor R4, the second pin and the eighth pin of the single chip microcomputer U, the voltage detection circuit is used for detecting voltages at two ends of a sampling resistor R5, a third pin and a seventh pin of the single chip microcomputer U2 are respectively connected with two ends of a sampling resistor R6 and used for detecting voltages at two ends of a sampling resistor R6, a fourth pin of the single chip microcomputer U2 is connected with the constant current driving circuit 1, a fifth pin of the single chip microcomputer U2 is grounded, and a sixth pin of the single chip microcomputer U2 is a power supply pin and is connected with a power supply end of the circuit. When the LED constant-current driving circuit works normally, the single chip microcomputer U2 detects voltages on the sampling resistor R4, the sampling resistor R5 and the sampling resistor R6, the fourth pin of the single chip microcomputer U2 outputs a PWM signal A to the constant-current driving circuit 1, and the constant-current driving circuit outputs current A to the three LED loads 2 to enable the three LED loads to work normally. When one or two LED loads 2 are disconnected, the single chip microcomputer U2 only detects the voltage of the sampling resistors on the rest LED loads 2, the fourth pin of the single chip microcomputer U2 outputs a PWM signal B to the constant current driving circuit 1, and the constant current driving circuit 1 outputs current B (the current B is less than the current A) to the rest LED loads 2 so that the LED loads can work normally.

In summary, by connecting the protection control circuit to the constant current driving circuit and the multiple paths of LED loads connected in parallel with the constant current driving circuit, when one or multiple paths of LED loads fail, the remaining multiple paths of LED loads can be disconnected to protect the LED loads, or a smaller current is output to enable the remaining multiple paths of LED loads to work normally.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above-described embodiments, and many modifications are possible. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should be considered as belonging to the protection scope of the present invention.

Claims

1. A protection control circuit of an LED lamp is characterized by comprising a constant current driving circuit, a plurality of paths of LED loads connected to the output end of the constant current driving circuit in parallel, detection circuits connected with the output end of the LED loads in series, a control circuit and a switch controller connected with the constant current driving circuit, wherein one path of output end of each detection circuit is connected with the control circuit, the other path of output end of each detection circuit is connected with each other, a public end of each detection circuit is connected with the switch controller, and the switch controller is connected with the control circuit.

2. The protection control circuit of the LED lamp as claimed in claim 1, wherein the detection circuit is a sampling resistor or a current detection chip.

3. The protection control circuit of the LED lamp according to claim 1, wherein the control circuit is a control chip or a single chip microcomputer.

4. The protection control circuit of the LED lamp as claimed in claim 1, wherein the switch controller is a transistor, a triode, or a MOS transistor.

5. The protection control circuit of the LED lamp is characterized by comprising a constant current driving circuit, a plurality of paths of LED loads connected to the output end of the constant current driving circuit in parallel, a detection circuit connected with the output end of the LED loads in series, and a control circuit connected with the constant current driving circuit, wherein one path of output end of each detection circuit is connected with the control circuit, the other path of output end of each detection circuit is connected with each other, and the common end of each detection circuit is connected with the constant current driving circuit.

6. The protection control circuit of the LED lamp as claimed in claim 5, wherein the detection circuit is a sampling resistor or a current detection chip.

7. The LED lamp protection control circuit according to claim 5, wherein the control circuit is a control chip, or a current limiter, or a single chip, or a comparison and analysis circuit.