CN202310228U

CN202310228U - LED lighting circuit

Info

Publication number: CN202310228U
Application number: CN2011204288594U
Authority: CN
Inventors: 张小龙; 叶勇军; 楼永伟
Original assignee: GAIN HIGH
Current assignee: Zhejiang Guanghui Lighting Electronics Co., Ltd.
Priority date: 2011-11-02
Filing date: 2011-11-02
Publication date: 2012-07-04
Anticipated expiration: 2021-11-02

Abstract

The utility model discloses an LED lighting circuit including an LED driver, an LED driving controller and an LED load circuit driven by the LED driver. The LED driving controller includes thermocouple input interfaces, a temperature collecting module and a control chip. The LED load circuit includes a plurality of LED load sub-circuits connected in parallel. Controllable switches are connected to at least a part of the sub-circuits. Thermocouples are connected to at least a part of components of the LED driver. Output terminals of the thermocouples connect with the thermocouple input interfaces electrically. The thermocouple input interfaces connect with input terminals of the temperature collecting module electrically. Output terminals of the temperature collecting module connect with temperature input terminals of the control chip electrically. Control terminals of the controllable switches connect with control signal output terminals of the control chip electrically. In the utility model, the temperature of the LED lighting circuit can be adjusted when the LED driver is in a running state all the time, thereby prolonging the service lifetime of the LED driver.

Description

A kind of LED lighting circuit

Technical field

The utility model belongs to the LED lighting field, particularly a kind ofly can regulate the LED lighting circuit of LED load size according to the situation of temperature detection.

Background technology

The LED illumination is described as third generation illumination, in lighting field, is in the develop rapidly stage.As everyone knows, make that LED is luminous must to have the special driving device to accomplish.Because the LED particle light-emitting can be brought very big heating loss, will toast the driver of pressing close to the LED lamp plate like this, adds the heating of driver itself, can make that the working temperature of driver is more abominable.Driver in case break down, will directly influence the work of whole LED light fixture as the core of LED light fixture.

Because the abominable working temperature of LED lamp interior, the producer of now a lot of LED light fixtures and driver all is concerned about the overtemperature protection problem very much, and the overwhelming majority is realized by the overheat protective function of driver self.The defencive function of the general direct dependence control chip of the overtemperature protection of driver self is realized, the output that few part can be come control chip through the thermistor equitemperature transducer that is installed on the driver appropriate location.A lot of overtemperature protections all are to occur directly cutting off the output of driver under the unusual situation in drive operation, after the internal temperature of driver drops to a certain degree, open driving more again, let LED normally export.So not only can make LED light fixture discontinuous operation, the direct variation that causes bright lamp to turn off the light, and might cause the damage of driver.

In addition, a lot of users are concerned about the useful life of LED light fixture very much.In fact, influencing useful life the most directly is the alminium electrolytic condenser that uses in the driver, and can successively decrease the service time of alminium electrolytic condenser along with increasing of working temperature, every rising 10 degree of general temperature, and the life-span reduces by half.If the alminium electrolytic condenser long-term work under the situation of high temperature, can shorten the service time of driver undoubtedly.

The utility model content

The purpose of the utility model is in order a kind of size that can regulate the LED load according to the situation of temperature detection to be provided, with the adjusting caloric value, and then to make driver in whole control process, be in the LED lighting circuit of work running status all the time.

The technical scheme that the utility model adopts is: a kind of LED lighting circuit; Comprise led driver; LED driving governor, and the LED load circuit that drives by led driver, said LED driving governor comprises thermocouple input interface, temperature collect module and control chip; Said LED load circuit comprises a plurality of LED load branch that are connected in parallel, and is connected with gate-controlled switch on the partial L ED load branch at least; At least be connected with thermocouple on the part components and parts of said led driver; The output of each thermocouple and be electrically connected with corresponding thermocouple input interface separately; Each thermocouple input interface and be electrically connected with the input of corresponding temperature collect module separately, being electrically connected of the output of each temperature collect module and control chip with corresponding temperature input port separately; Being electrically connected of the control end of each gate-controlled switch and control chip with corresponding control signal output ends mouth separately.

The beneficial effect of the utility model: the lighting circuit of the utility model can be regulated the size of LED load according to the heating situation of each key components of led driver; And then make led driver under the operating mode that is in running status all the time, regulate its temperature, prolong the useful life of led driver.

Description of drawings

Fig. 1 is the structural representation according to a kind of embodiment of the LED lighting circuit of the utility model;

Fig. 2 shows a kind of arrangement of thermocouple;

Fig. 3 shows the internal structure of LED driving governor among Fig. 1.

Embodiment

As shown in Figure 1; The LED lighting circuit of the utility model comprises led driver A; LED driving governor B, and the LED load circuit that drives by led driver A, wherein; Be connected with thermocouple on the components and parts of part at least of this led driver A, the output of each thermocouple and LED driving governor B are electrically connected with corresponding thermocouple input interface separately; As shown in Figure 3; Each thermocouple input interface B1 of this LED driving governor B and be electrically connected with the input of corresponding temperature collect module B2 separately, the output of each temperature collect module B2 and control chip B3 are electrically connected with corresponding temperature input port separately; In addition, this LED load circuit comprises a plurality of LED load branch that are connected in parallel, and is connected with gate-controlled switch on each LED load branch, and the control end of each gate-controlled switch and control chip B3 are electrically connected with corresponding control signal output ends mouth separately.

The operation principle of the LED lighting circuit of the utility model is: the temperature monitoring point of in led driver A, arranging some key componentses; Thermocouple through be connected (as bonding) with key components carries out temperature sampling; The temperature data that obtains of monitoring compares with the operational factor that is stored among the control chip B3 in advance, if find that Monitoring Data is higher, and the gate-controlled switch on the control chip B3 cutoff LED load circuit then; Operating load with adjustment led driver A reduces temperature; After monitor temperature arrived predefined safety value, LED driving governor B can open the gate-controlled switch that is turned off on the LED load circuit once more, carried out the load adjustment of led driver, thus the work of adjustment driver.Driver is in the state of work operation all the time in whole control process, the situation that quit work intermittence, lamp one bright goes out can not occur.

Normally used led driver is as shown in Figure 1; Mainly comprise printed circuit board (PCB) 1, input alminium electrolytic condenser 2, switching transistor 3, control chip 4, transformer 5, output rectifier diode 6 and output alminium electrolytic condenser 7; As a kind of embodiment; Can thermocouple 8 be bonded on the input alminium electrolytic condenser 2; Thermocouple 9 is bonded on the switching transistor 3, thermocouple 10 is bonded on the control chip 4, thermocouple 11 is bonded on the transformer 5, thermocouple 12 is bonded on the output rectifier diode 6, thermocouple 13 is bonded in output alminium electrolytic condenser 7.At this, the circuit structure of led driver does not relate to the improvement of the utility model, and above-mentioned components and parts all adopt conventional syndeton, no longer give unnecessary details at this.

The above is merely the utility model preferred implementation, is not the practical range that is used for limiting the utility model, and the equivalence of in the protection range of the utility model, being done in every case changes and modifies, and all should think to have fallen in the protection range of the utility model.

Claims

1. LED lighting circuit; It is characterized in that: comprise led driver; LED driving governor, and the LED load circuit that drives by led driver, said LED driving governor comprises thermocouple input interface, temperature collect module and control chip; Said LED load circuit comprises a plurality of LED load branch that are connected in parallel, and is connected with gate-controlled switch on the partial L ED load branch at least; At least be connected with thermocouple on the part components and parts of said led driver; The output of each thermocouple and be electrically connected with corresponding thermocouple input interface separately; Each thermocouple input interface and be electrically connected with the input of corresponding temperature collect module separately, being electrically connected of the output of each temperature collect module and control chip with corresponding temperature input port separately; Being electrically connected of the control end of each gate-controlled switch and control chip with corresponding control signal output ends mouth separately.