CN210266844U

CN210266844U - LED spotlight with constant temperature

Info

Publication number: CN210266844U
Application number: CN201920925698.6U
Authority: CN
Inventors: 康尚国
Original assignee: Shenzhen Yaoxian Technology Co ltd
Current assignee: Shenzhen Yaoxian Technology Co ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-04-07
Anticipated expiration: 2029-06-19

Abstract

The utility model provides a high-power LED shot-light of constant temperature, including the shell and install LED lamp plate and the control panel in the shell, be equipped with the high-power LED light source of a plurality of on the LED lamp plate, the control panel is connected with high-power LED lamp plate. An LED driving chip, a temperature acquisition circuit connected with the LED driving chip and a chopper circuit connected with the LED driving chip are integrated on the control panel. When the utility model discloses when the shot-light rose the uniform temperature in using, the resistance of self resistance can be reduced to the NCT thermistor on the temperature acquisition circuit, through LED driver chip and chopper circuit, make the power of exporting the high-power LED light source reduce, can reduce the heat that high-power LED light source gived off, otherwise, can increase the power of exporting the high-power LED light source, increase the heat that the shot-light gived off, so circulate, can be with the shot-light invariant at the uniform temperature, can solve current shot-light in use from this and continuously heat up the problem that reduces shot-light life.

Description

LED spotlight with constant temperature

Technical Field

The utility model relates to a technical field of LED shot-light especially relates to a constant temperature's LED shot-light.

Background

As is known, the rated current of a low-power LED lamp is below 20mA, and when the rated current is higher than 20mA, the low-power LED lamp can be basically calculated as a high-power LED lamp, and an LED spot lamp is a spot lamp using a light emitting diode (i.e., an LED lamp) as a light source. The traditional spot lamp mostly adopts a halogen lamp, has low luminous efficiency and relatively high power consumption, and has short service life and increased temperature of the irradiated environment. The LED light source is far superior to the traditional lighting lamp in the aspects of light-emitting principle, energy conservation and environmental protection, and the high-power LED spot lamp is the spot lamp taking the high-power LED lamp as the light source.

At present, in the use process of the existing high-power LED spot lamp in the market, the high-power LED light source generates heat, the temperature of the whole high-power LED spot lamp is easy to continuously rise, the high-power LED lamp is easy to damage, the use of the high-power LED light source is influenced, and the service life of the high-power LED spot lamp is shortened.

Disclosure of Invention

In order to solve the defects and deficiencies of the prior art, the utility model provides a high-power LED spotlight which has the function of invariable whole lamp temperature and prevents the high temperature from influencing the use of a high-power LED light source.

The utility model adopts the technical proposal that: the utility model provides a LED shot-light of constant temperature, includes the shell and installs LED lamp plate and control panel in the shell, be provided with a plurality of LED light source on the LED lamp plate, its characterized in that is connected with the LED lamp plate to the control panel: the LED driving circuit comprises a control panel, a power supply end, an LED driving chip, a power circuit, a temperature acquisition circuit, a chopper circuit, an LED positive output end and an LED negative output end, wherein the power supply end is used for being connected with a power supply, the LED driving chip is used for reducing voltage and constant current, the power circuit is used for stabilizing voltage and is connected with the LED driving chip, the temperature acquisition circuit is used for acquiring temperature and is connected with the LED driving chip, the chopper circuit is used for adjusting voltage and is connected with the LED driving chip, the LED positive output end and the LED negative output end are connected with an LED light source.

Preferably, the model of the LED driving chip is FP 7175.

Preferably, the power circuit comprises a schottky rectifier bridge stack connected with a power end, and a first diode and a first capacitor which are connected in parallel with two ends of a load anode and a load cathode of the schottky rectifier bridge stack, a second pin of the LED driving chip is connected with a load cathode output end of the schottky rectifier bridge stack, a third pin of the LED driving chip is connected with a load cathode output end of the schottky rectifier bridge stack through a first resistor, and a load anode output end of the schottky rectifier bridge stack is connected with a sixth pin of the LED driving chip and an LED anode output end.

Preferably, the temperature acquisition circuit comprises a second resistor and an NTC thermistor, a fifth pin of the LED driving chip is connected to the load output end of the schottky rectifier bridge through the second resistor and the NTC thermistor which are connected in parallel, a second capacitor is further connected in series at a connection between the second resistor and the load output end of the schottky rectifier bridge, and a fourth pin of the LED driving chip is further connected in parallel at a connection between the second capacitor and the second resistor.

Preferably, the chopper circuit includes a second diode, an inductor, a chopper connected to a first pin of the LED driver chip, and a third resistor and a fourth capacitor connected in parallel between an anode output end and a cathode output end of the LED, a gate of the chopper is connected to the first pin of the LED driver chip, a source of the chopper is connected to a third pin of the LED driver chip, and a drain of the chopper is connected to the anode output end of the LED through the second diode and to the cathode output end of the LED through the inductor.

Preferably, a fuse is further connected in series at the connection between the power supply end and the power input end of the schottky rectifier bridge stack.

The utility model has the advantages that: compared with the prior art, the utility model integrates the LED driving chip for reducing the voltage and the constant current, the temperature acquisition circuit for acquiring the temperature and the chopper circuit for adjusting the voltage on the control panel, when the temperature of the high-power LED spot lamp rises to a certain temperature in the using process, the NCT thermistor on the temperature acquisition circuit acquires the temperature and reduces the resistance of the resistor, so that the PWM driving signal output by the first pin of the LED driving chip is reduced, the chopping frequency of the chopper circuit is increased, the current of the high-power LED light source is further reduced, the power of the high-power LED light source is reduced, the heat emitted when the high-power LED light source is used can be reduced, otherwise, the current of the high-power LED light source is increased, the power of the high-power LED light source is increased, and the heat emitted when the high-power LED light source is used can be increased, so circulate, can realize will the utility model discloses a high-power shot-light is invariable at the uniform temperature. Therefore, the problem that the temperature of the existing high-power LED spotlight is continuously increased in the using process and easily affects a high-power LED light source can be solved, the using experience of people is improved, and the service life of the high-power LED spotlight can be prolonged.

Drawings

Fig. 1 is a perspective view of an embodiment of the present invention.

Fig. 2 is a circuit diagram of a control board according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are only some sub-embodiments of the present invention. Based on the embodiments in the present invention, other embodiments obtained by the skilled in the art without creative work all belong to the protection scope of the present invention.

Referring to fig. 1 and 2, in an embodiment of the present invention, an LED spot lamp with a constant temperature includes a housing 100, and an LED lamp panel (not shown in the figure) and a control panel (not shown in the figure) installed in the housing 100, wherein a plurality of LED light sources (not shown in the figure) are disposed on the LED lamp panel, and the control panel is electrically connected to the LED lamp panel. The LED driving circuit comprises a control panel, and is characterized in that a power supply end 1 for connecting a power supply, an LED driving chip 5 for reducing voltage and constant current, a power supply circuit 2 for stabilizing voltage and connected with the LED driving chip 5, a temperature acquisition circuit 3 for acquiring temperature and connected with the LED driving chip 5, a chopper circuit 4 for adjusting voltage and connected with the LED driving chip 5, and an LED anode output end 6 and an LED cathode output end 7 which are connected with an LED light source are integrated on the control panel, wherein the LED anode output end 6 is connected with the power supply circuit 2, and the LED cathode output end 7 is connected with the chopper circuit 3.

Specifically, in the embodiment of the present invention, in order to optimize the system, the LED driver chip may adopt a chip of FP7175 model, and it should be explained that the LED driver chip may also adopt models of other chips, which is not limited by the present invention.

The power circuit 2 comprises a Schottky rectifier bridge stack BQ1 connected with a power end 1, a first diode D1 and a first capacitor C1 which are connected with the load positive and negative ends of the Schottky rectifier bridge stack BQ1 in parallel, a second pin of the LED driving chip 5 is connected with the load negative output end of the Schottky rectifier bridge stack BQ1, a third pin of the LED driving chip 5 is connected with the load negative output end of the Schottky rectifier bridge stack BQ1 through a first resistor R1, and the load positive output end of the Schottky rectifier bridge stack BQ1 is connected with a sixth pin of the LED driving chip 5 and the LED positive output end 7. The temperature acquisition circuit 3 includes second resistance R2, NTC thermistor, the schottky rectifier bridge heap BQ1 load output is connected through second resistance R2, the NTC thermistor that is parallel connection to the fifth pin of LED driver chip, the junction of second resistance R2 and schottky rectifier bridge heap BQ1 load output still establishes ties there is second electric capacity C2, the junction of second electric capacity C2 and second resistance R2 still has the fourth pin of LED driver chip 5 in parallel. The chopper circuit 4 comprises a second diode D2, an inductor L1, a chopper Q1 connected with a first pin of the LED driving chip 5, a third resistor R3 and a fourth capacitor C4 which are connected between the LED positive output end 6 and the LED negative output end 7 in parallel, a grid G of the chopper Q1 is connected with the first pin of the LED driving chip 5, a source of the chopper is connected with a third pin of the LED driving chip 5, and a drain of the chopper is connected with the LED positive output end 6 through the second diode D2 and is connected with the LED negative output end 7 through the inductor L1. In order to prevent the utility model discloses damage the use of high-power LED light source when the temperature of shot-light or electric current are too high, power end 1 and schottky rectifier bridge BQ1 power input end junction still establish ties and have a fuse F1.

Adopt above-mentioned structure circuit, work as the utility model discloses a high-power LED shot-light when the temperature rose to the uniform temperature (as 80 degrees) in the use, NTC thermistor's resistance then begins to descend, then can make the voltage of 5 fifth end feet of LED driver chip reduce, when the voltage of 5 fifth pins of LED driver chip is less than the certain degree (if be less than 1.5 volts), the PWM drive signal that 5 first pins of LED driver chip exported also begins to reduce, and then make chopper Q1's chopping frequency rise, make the electric current of exporting the high-power LED light source reduce, can reduce the power of exporting the high-power LED light source, the heat that gives off when from this can reducing high-power LED light source and using. On the contrary, when the utility model discloses a temperature of high-power LED shot-light is less than the uniform temperature (if 80 degrees), NTC thermistor's resistance then begins to rise, then can make the voltage grow of 5 fifth end feet of LED driver chip, when the voltage of 5 fifth pins of LED driver chip is high to certain extent (if being higher than 1.5 volts), the PWM drive signal that 5 first pins of LED driver chip exported also begins to strengthen, and then make chopper Q1's chopping frequency reduce, make the electric current grow of exporting the high-power LED light source, can increase the power of exporting the high-power LED light source, the heat that distributes when can increasing high-power LED light source from this and using, so circulate, can realize the utility model discloses a high-power LED constant shot-light is at a certain temperature (if about 80 degrees). Therefore, the problem that the temperature of the existing high-power LED spotlight is continuously increased in the using process and the high-power LED light source is easy to damage can be solved, the use experience of people is improved, and the service life of the high-power LED spotlight can be prolonged.

The above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. But rather, obvious variations and modifications may be made without departing from the spirit of the invention.

Claims

1. The utility model provides a LED shot-light of constant temperature, includes the shell and installs LED lamp plate and control panel in the shell, be provided with a plurality of LED light source on the LED lamp plate, its characterized in that is connected with the LED lamp plate to the control panel: the LED driving circuit comprises a control panel, a power supply end, an LED driving chip, a power circuit, a temperature acquisition circuit, a chopper circuit, an LED positive output end and an LED negative output end, wherein the power supply end is used for being connected with a power supply, the LED driving chip is used for reducing voltage and constant current, the power circuit is used for stabilizing voltage and is connected with the LED driving chip, the temperature acquisition circuit is used for acquiring temperature and is connected with the LED driving chip, the chopper circuit is used for adjusting voltage and is connected with the LED driving chip, the LED positive output end and the LED negative output end are connected with an LED light source.

2. A constant temperature LED spotlight according to claim 1, wherein: the model of the LED driving chip is FP 7175.

3. A constant temperature LED spotlight according to claim 2, wherein: the power circuit comprises a Schottky rectifier bridge stack connected with a power end, a first diode and a first capacitor, wherein the first diode and the first capacitor are connected to two ends of a load anode and a load cathode of the Schottky rectifier bridge stack in parallel, a second pin of the LED driving chip is connected with a load cathode output end of the Schottky rectifier bridge stack, a third pin of the LED driving chip is connected with a load cathode output end of the Schottky rectifier bridge stack through a first resistor, and a load anode output end of the Schottky rectifier bridge stack is connected with a sixth pin of the LED driving chip and an LED anode output end.

4. A constant temperature LED spotlight according to claim 2, wherein: the temperature acquisition circuit comprises a second resistor and an NTC thermistor, a fifth pin of the LED driving chip is connected with a load output end of the Schottky rectifier bridge through the second resistor and the NTC thermistor which are connected in parallel, a second capacitor is further connected in series with the junction of the second resistor and the load output end of the Schottky rectifier bridge, and a fourth pin of the LED driving chip is further connected in parallel with the junction of the second capacitor and the second resistor.

5. A constant temperature LED spotlight according to claim 2, wherein: the chopper circuit comprises a second diode, an inductor, a chopper connected with a first pin of the LED driving chip, a third resistor and a fourth capacitor which are connected in parallel between the anode output end of the LED and the cathode output end of the LED, wherein the grid electrode of the chopper is connected with the first pin of the LED driving chip, the source electrode of the chopper is connected with the third pin of the LED driving chip, and the drain electrode of the chopper is connected with the anode output end of the LED through the second diode and is connected with the cathode output end of the LED through the inductor.

6. A constant temperature LED spotlight according to claim 3, wherein: and a fuse is also connected in series at the connection position of the power supply end and the power supply input end of the Schottky rectifier bridge stack.