TW201604483A - LED control device and LED lighting fixture having the same - Google Patents

Abstract

The present invention provides a LED control device and LED lighting fixture thereof, which is applied for LED lighting equipment. When the power supply is turned on, the LED control device of this present invention will synchronously detect whether an abnormality is occurred. If an abnormality is occurred, such as too high the temperature too high of LED lamp, damage of cooling fan itself, or the cooling fan blades was blocked by foreign matter, the LED control device will actively turn off the LED lamp. Therefore, the circuit configuration disclosed in this invention may achieve the purpose of synchronously controlling whether to supply the driving power to the LED lamp or not under the conditions of controlling the temperature and the fan operation. Thus, the present invention may ensure the lighting quality and safety of LED lighting fixture during lightening.

Description

LED control device and LED lighting device with LED control device

The present invention relates to an LED control device and an LED lighting device having an LED control device.

In recent years, Light Emitting Diodes (LEDs) have received increasing attention. Compared with traditional white heat bulbs, LED lamps have the advantages of high illumination, power saving, long service life, high durability and fast response speed, so the demand in the lighting market has increased year by year.

However, the high operating temperature accompanying high-brightness lighting requirements not only reduces the luminous efficiency of LED lamps that are sensitive to temperature changes, but also accelerates the aging of LED lamps and greatly shortens the service life of LED lamps. . Therefore, in addition to passively increasing the volume of the heat sink, it is also necessary to cooperate with a cooling fan to actively help the LED lamps to dissipate heat, so as to achieve the purpose of cooling the LED lamps.

However, even if it is equipped with a cooling fan, it may still be used for a long time and uninterrupted use, which may cause the heat to not catch up with the temperature of the heating, causing the temperature of the LED lamp to be too high, or the cooling fan itself is damaged, and the fan blade is damaged by a foreign object. The problem that the cooling fan cannot smoothly dissipate heat and the like occurs, causing the above-mentioned problem of high-temperature light decay and insufficient life to relapse, and may even cause a fire, explosion, fire, and the like due to temperature loss, which seriously affects Lighting quality and safety of LED lamps.

In order to solve the above-mentioned shortcomings of the prior art, the present invention provides an LED control device and an LED lighting device having the LED control device. When the power supply is turned on, the LED control device of the present invention synchronously detects whether an abnormal situation occurs, for example, if the temperature of an LED lamp is too high, the heat dissipation fan itself is damaged, or the fan blade of the heat dissipation fan is stuck by a foreign object, etc. When an abnormal situation occurs, the LED control device actively turns off the LED light, thereby ensuring the illumination quality and safety of the LED lighting device when it is lit.

To achieve the above and other objects, the present invention provides an LED control device for monitoring the operation of a cooling fan and controlling an LED driving circuit of an LED lamp, the LED control device receiving a voltage source from a power supply circuit. The LED control device comprises: a temperature detecting circuit, a fan control circuit and a synchronous control circuit, wherein the temperature detecting circuit is connected to the power supply circuit to detect the temperature of the LED lamp, and corresponding to the temperature output a first indicating electrical signal; the fan control circuit is connected to the temperature detecting circuit and the fan sensing circuit of the cooling fan, and receives a first indicating electrical signal from the temperature detecting circuit to control the starting of the cooling fan And the synchronous control circuit is connected to the blade sensing circuit and the LED driving circuit of the LED lamp, and receives a second indicating electrical signal corresponding to the fan blade sensing circuit corresponding to the rotation speed of the cooling fan. The synchronous control circuit controls the activation and deactivation of the LED driving circuit according to the second indication electrical signal.

In an embodiment of the invention, when the temperature detecting circuit detects that the temperature of the LED lamp is higher than a rated temperature, a first shutdown signal corresponding to the first indication electrical signal is output, and the fan control circuit is After the first shutdown signal is received, the operation of the cooling fan is turned off, and the blade sensing circuit returns to the stop operation of the cooling fan to output a second shutdown signal corresponding to the second indication signal, and the synchronization control circuit receives After the second off signal, the LED driving circuit is controlled to be turned off.

In an embodiment of the present invention, when the temperature of the LED light detected by the temperature detecting circuit is lower than a starting temperature, a first starting electrical signal belonging to the first indicating electrical signal is output, and the fan control circuit is Receiving or maintaining the operation of the cooling fan after receiving the first startup signal, and sensing the rotation speed of one of the blades of the cooling fan through the blade sensing circuit, and the blade feel when the rotation speed is higher than a rated rotation speed The measuring circuit outputs a second starting electrical signal belonging to the second indicating electrical signal, and the synchronous control circuit controls the LED driving circuit to be turned on after receiving the second starting electrical signal.

In an embodiment of the invention, the blade sensing circuit outputs a second warning signal belonging to the second indication signal when the rotation speed is lower than the rated rotation speed, and turns off the operation of the cooling fan, the synchronization The control circuit controls the LED driving circuit to cause the LED lamp to issue a warning after receiving the second warning signal.

In an embodiment of the invention, the temperature detecting circuit includes a first resistor, a second resistor, a third resistor, a thermistor and a comparator, the first resistor and the second resistor are connected in series Forming a first resistor string, the third resistor is connected in series with the thermistor to form a second resistor string, and an inverting input end of the comparator is connected between the first resistor and the second resistor, a positive phase input terminal of the comparator is connected between the third resistor and the thermistor, the first resistor string and the second resistor string are connected in parallel with the comparator, wherein the first resistor, the second resistor, and The third resistor is configured to set the nominal temperature and the startup temperature.

In an embodiment of the invention, the synchronous control circuit controls the LED driving circuit to intermittently illuminate the LED light after receiving the second warning signal.

In an embodiment of the invention, the LED control device further includes a voltage stabilizing circuit disposed between the power supply circuit and the temperature detecting circuit to provide a stable voltage to the temperature detecting circuit.

To achieve the above and other objects, the present invention also provides an LED lighting device having an LED control device, including a power supply circuit, an LED lamp, a heat dissipation fan, and an LED control device as described above, the power supply circuit being connected to The LED lamp, the heat dissipation fan and the LED control device, wherein the LED control device is disposed in the heat dissipation fan.

In an embodiment of the invention, the heat dissipation fan has a hole to expose the temperature detecting circuit on the LED control device, and the hole is facing the LED lamp.

Thereby, the LED control device of the present invention and an LED lighting device having the LED control device are mainly controlled by the fan control circuit, so that whether the LED lamp is driven or not depends on whether the fan control circuit operates normally, and the operation of the fan and It is subject to the temperature of the LED lamp. Therefore, by controlling the circuit configuration with the control sequence, the control of the supply of the LED lamp driving power can be controlled under the control conditions of the temperature and the fan operation. The temperature of an LED lamp can be monitored at any time. When the temperature of the LED lamp is too high, the LED lamp can be turned off to prevent the LED lighting device from overheating and destroying, thereby maintaining the service life of the LED lighting device. It can be judged whether an abnormality such as damage of the cooling fan itself or the fan blade of the cooling fan is caught by foreign matter, thereby ensuring the illumination quality and safety of the LED lighting device of the present invention when lighting.

In order to fully understand the objects, features and advantages of the present invention, the present invention will be described in detail by the following specific embodiments and the accompanying drawings.

Referring to FIG. 1A, FIG. 1A is a block diagram showing an application of the LED control device 400 in the first embodiment of the present invention to the LED lighting device 1000. As shown, the LED lighting device 1000 includes a power supply circuit 100, an LED lamp 200, a heat dissipation fan 300, and the LED control device 400. The LED lamp 200 has an LED chip 210 and an LED driving circuit 220. The cooling fan 300 has a blade sensing circuit 310 and a blade 320. The cooling fan 300 can be, for example, none. Brush DC (BLDC) fan.

The power supply circuit 100 includes a power source 110 and a transformer 120. The power source 110 can be an external AC power source or an internal battery. The transformer 120 has an input terminal SIN, a first output terminal S1, and a second output terminal S2. And a third output terminal S3. When the LED lighting device 1000 is used, the input terminal SIN of the transformer 120 can be electrically connected to the power source 110 to respectively convert one of the power inputs from the power source 110 into a first voltage V ₁ suitable for the LED lamp 200. Applying a second voltage V _{2 of} the cooling fan 300 and a third voltage V ₃ suitable for the LED control device 400 to provide the first voltage V ₁ to the LED lamp 200 to make the LED of the LED lamp 200 210 LED chip; providing the second voltage V ₂ to the cooling fan 300 so that the blades 300 of the fan 320 is rotated by a cyclone 200 to help thermal convection heat of the LED lamp to extend the life of the LED lamp 200 Providing the third voltage V ₃ to the LED control device 400 to activate the LED control device 400 to control the activation and shutdown of the LED lamp 200 and the cooling fan 300. That is, the power supply circuit 100 can separately supply power to the LED lamp 200, the heat dissipation fan 300, and the LED control device 400 to supply power required for its operation.

The LED lamp 200 and the heat dissipation fan 300 are controlled by the LED control device 400 such that the LED lamp 200 can be returned to the state of the heat dissipation fan 300 through the LED control device 400, wherein the LED control device 400 includes A temperature detecting circuit 410, a fan control circuit 420 and a synchronous control circuit 430.

The temperature detecting circuit 410 is connected to the power supply circuit 100 to receive the third voltage V ₃ from the power supply circuit 100, and the temperature detecting circuit 410 detects the LED through a temperature sensing component 411 therein. The temperature of one of the LED chips 210 of the lamp 200 is based on the temperature, and a corresponding first indication signal C1 is output according to the temperature.

The fan control circuit 420 is connected between the temperature detecting circuit 410 and the blade sensing circuit 310 of the cooling fan 300, and receives the first indicating electrical signal C1 from the temperature detecting circuit 410 to control the cooling fan 300. When the blade sensing circuit 310 is activated, the blade sensing circuit 310 senses the rotation speed of one of the blades 320 of the cooling fan 300 through the blade sensing circuit 310, and outputs according to the rotation speed. Corresponding a second indication signal C2 to the synchronization control circuit 430.

The synchronous control circuit 430 is connected to the blade sensing circuit 310 and the LED driving circuit 220 of the LED lamp 200 to receive the second indicating electrical signal C2 from the fan control circuit 420 to control the activation of the LED driving circuit 220 and Turning off, thereby causing the LED wafer 210 of the LED lamp 200 to remain activated and deactivated.

For example, when the temperature of the LED chip 210 detected by the temperature detecting circuit 410 is higher than a rated temperature (for example, 50 ° C), the temperature detecting circuit 410 outputs a first off signal C11 to the fan control. The circuit 420 is configured to turn off the cooling fan 300, the blade sensing circuit 310 outputs a second closing signal C21, and the synchronous control circuit 430 is used to turn off the LED lamp 200 after receiving the second closing signal C21; When the temperature detecting circuit 410 detects that the temperature of the LED chip 210 is lower than a starting temperature, the temperature detecting circuit 410 outputs a first starting electrical signal C12 to the fan control circuit 420 to activate the cooling fan 300. And sensing, by the blade sensing circuit 310, a rotation speed of one of the blades 320 of the cooling fan 300, outputting a second activation signal C22 when the rotation speed is higher than a rated rotation speed, and receiving the synchronization control circuit 430 by using the synchronous control circuit 430. After the second activation signal C22, the LED lamp 200 is turned on, wherein the LED lamp 200 is kept on when the LED lamp 200 is turned on (that is, the LED lamp 200 is normally turned on, and the LED control device of the present invention is still in the Background is constantly being executed Control operation). On the other hand, for example, when the rated rotational speed is set to zero revolution, that is, when the cooling fan 300 is higher than zero rotation and is in operation, the second starting electrical signal C22 is output.

That is, if the temperature of the LED chip of the LED lamp is too high, the cooling fan and the LED lamp can be turned off by the LED control device; if the temperature of the LED chip of the LED lamp drops to the startup temperature (safe temperature) The cooling fan and the LED lamp can be activated or maintained in an activated state by the LED control device.

It is to be noted that when the temperature detecting circuit detects that the temperature of the LED chip 210 is lower than the starting temperature, a first starting signal C12 is output to the fan control circuit 420 to activate the cooling fan 300, and The blade sensing circuit 310 senses the rotation speed of the fan blade 320 of the cooling fan 300. When the rotation speed is lower than the rated rotation speed, a second warning signal C23 is output to the synchronization control circuit 430, and the synchronization control is utilized. The circuit 430, after receiving the second warning signal C23, causes the LED lamp 200 to issue a warning, for example, to issue a warning in such a manner that the LED lamp is strobed or turned off. Therefore, the LED control device of the present invention can be controlled by the fan control circuit, and whether the driving of the LED lamp depends on whether the fan control circuit operates normally, and whether the fan is operated or not is subject to the temperature of the LED lamp. With such a circuit configuration having a control sequence, it is possible to achieve multiple control of the supply of the LED lamp driving power under the control conditions of the temperature and the fan operation, thereby ensuring that the LED lighting device of the present invention is illuminated. The quality of lighting and its safety. In the case of the example of this paragraph, when the fan blade 320 of the heat dissipation fan 300 is damaged or caught by a foreign object, the rotation speed of the fan blade 320 of the heat dissipation fan 300 may be reduced or even inoperable. The LED control device cuts off the driving power of the LED lamp or strobes the LED lamp in an intermittent supply manner (since the strobe time is short, the user may be prompted to continue to cause the temperature to be too high); When the abnormality of the fan blade 320 of the heat dissipation fan 300 is eliminated, the LED lamp can be restarted by the LED control device.

Thereby, the LED control device of the present invention can monitor the temperature of the LED lamp at any time to avoid the occurrence of overheating damage of the LED lighting device, thereby maintaining the service life of the LED lighting device. At the same time, it is judged whether there is an abnormality such as damage of the fan itself or the blade is caught by foreign matter, thereby ensuring the illumination quality and safety of the LED lamp when it is lit.

Referring to FIG. 1B, FIG. 1B is a block diagram of an LED lighting apparatus 1000 according to a second embodiment of the present invention. As shown in the figure, the LED control device 400 further includes a voltage stabilizing circuit 450 disposed between the transformer 120 of the power supply circuit 100 and the temperature detecting circuit 410, and supplied to the second voltage of the temperature detecting circuit 410. V ₂ can pull the voltage value below the ripple valley by the voltage regulator circuit 450, and then convert it into a stable voltage VC that can be used by the temperature detecting circuit 410 to prevent the power source 110 from being unstable. The interference (which causes the reference voltage of the temperature detecting circuit 410 to drift and cause temperature monitoring to be incorrect) allows the temperature detecting circuit 410 to more accurately perform the above temperature determination.

Please refer to FIG. 2, which is a block diagram of an LED lighting apparatus 1000 according to a third embodiment of the present invention. The LED control device 400 is integrated in the cooling fan 300 to form a cooling fan assembly 300'. The LED control device 400 of the cooling fan assembly 300' receives the output from the fourth output terminal S4 of the transformer 120 of the power supply circuit 100. A fourth voltage V ₄ is caused to actuate the LED control device 400 to drive the fan blade 320 of the heat dissipation fan 300 to rotate.

Next, please refer to FIG. 3, which is an internal circuit diagram of the cooling fan group 300' according to an embodiment of the present invention. As shown in the figure, the voltage stabilizing circuit 450 controls the base voltage VB of the transistor Q3 to a stable value by a Zener diode ZD1, and then inputs the temperature to the temperature using the voltage drop characteristic of the transistor Q3 itself. The voltage value of the second voltage V _{4 of the} measuring circuit 410 is converted into a stable voltage VC usable by the temperature detecting circuit 410 to reduce unnecessary chopping interference.

In this embodiment, the temperature detecting circuit 410 includes a first resistor R1, a second resistor R2, a third resistor R3, a thermistor RT (ie, the temperature sensing component 411 described above), and a comparator. The first resistor R1 is connected in series with the second resistor R2 to form a first resistor string. The third resistor R3 is connected in series with the thermistor RT to form a second resistor string. An inverting input terminal of the comparator Connected between the first resistor R1 and the second resistor R2, a positive phase input terminal of the comparator is connected between the third resistor R3 and the thermistor R4, the first resistor string, the second A resistor string is connected in parallel with the comparator. Since the resistance of the thermistor RT is higher at a higher temperature, the resistance of the thermistor RT to the opposite ends of the comparator can be adjusted by the resistance change of the LED lamp at different instantaneous temperatures. Pressing, and then determining a temperature, when the temperature detecting circuit 410 detects that the temperature exceeds the rated temperature, the temperature detecting circuit 410 outputs the first closing signal C11 to the fan control circuit 420 to close the The temperature detecting circuit 140 outputs a first starting signal C12 to the fan control circuit 420 to activate the cooling fan 300. The thermistor RT can be controlled in a preferred linear region by adjusting the first resistor R1, the second resistor R2, and the third resistor R3 (ie, the resistance value is in a linear relationship with the temperature, when the temperature is When changing, the change in resistance value will show a stable range of change). In addition to selecting a better linear region, since the thermistor RT is not an instantaneous real-time reaction ambient temperature, it is necessary to react to the resistance value when the actual ambient temperature is lowered below the rated temperature, and the resistor R1~3 The combination of the action curve of the thermistor RT with respect to the ambient temperature (the magnitude of the resistance change with temperature) can be selected by the combination of the resistors R1~3 to select the action region of the thermistor RT. If the starting temperature is lower than the rated temperature, for example, when a slower change interval is selected in the linear region of the thermistor RT, the starting temperature is farther away from the rated temperature (the difference is larger); When a steeper interval is selected in the linear region of the thermistor RT, the starting temperature is closer to the rated temperature (less difference). On the other hand, since the rated temperature is set by the actual ambient temperature with the resistors R1~3, when the ambient temperature reaches the rated temperature, the temperature detecting circuit 410 can be immediately activated (the same through the resistors R1~3). Match with the selected range of action).

In this embodiment, the fan control circuit 420 is connected to the temperature detecting circuit 410 and the blade sensing circuit 310. The rotation speed of the fan blade 320 of the cooling fan 300 can be detected, and according to the blade 320. The rotation speed outputs a corresponding second indication signal C2 to the synchronization control circuit 430. The blade sensing circuit 310 includes a Hall IC for sensing the magnetic field of the blade to perform corresponding magnetic field switching on the coil COIL.

In this embodiment, the synchronous control circuit 430 is connected to the fan control circuit 420, receives the second indication electrical signal C2 from the fan control circuit 420, and the synchronous control circuit 430 connects the LED light through an output terminal OUT. an LED driving circuit 220 to the LED driving circuit 220 controls the activation and deactivation, thereby controlling the first voltage V ₁ induced current if the input to the LED wafer 210, to illuminate the LED chip 210 and closing. In addition, the synchronization control circuit 430 can also control the time difference between the startup and the shutdown of the LED driving circuit 220, and use a long-time shutdown or intermittent strobe to indicate different abnormal conditions, so as to facilitate a user to debug. .

Further, please refer to FIG. 4 and FIG. 5 at the same time, and FIG. 4 is an exploded view of the LED lighting device in an embodiment of the present invention. Fig. 5 is a schematic view showing an LED lighting device in an embodiment of the invention. As shown in the figure, the LED lighting device 1000 can be a lamp, which is composed of a lamp cover 510, an LED lamp 200, a main heat sink 520, a cooling fan 300, a partition 530, a driving module 540, A casing 550 and a base 560 are sequentially combined. One or more LED chips 210 are disposed on the LED lamp 200, and an LED control device 400 of the present invention is disposed in the heat dissipation fan 300. The heat dissipation fan 300 is provided with a hole (not shown, located on the other side of the heat dissipation fan 300) for the temperature sensing element 411 of the temperature detecting circuit 410 on the LED control device 400. The thermistor RT is adjacent to the LED lamp 200 (the main heat sink 520 will direct the heat of the LED lamp 200 to the main heat sink 520 body). When an external power source 110 is supplied to the driving module 540 of the lamp through the lamp cap 560, the driving module 540 drives the LED lamp 200, the cooling fan 300, and the cooling fan through a transformer 120 disposed therein. 300 LED control device 400.

Thereby, the LED lighting device of the present invention adopts the circuit configuration with the control sequence, and the fan control circuit is used as the main control, and the supply of the LED lamp driving power can be synchronized under the control conditions of the temperature and the fan operation. No control purpose, and then the temperature of the LED lamp can be monitored at any time, and the LED lamp is turned off when the temperature of the LED lamp is too high, so as to avoid the overheating and destruction of the LED lighting device, thereby maintaining the service life of the LED lighting device. . At the same time, it is judged whether or not an abnormality such as damage of the cooling fan itself or the blade is caught by foreign matter occurs, thereby ensuring the illumination quality and safety of the LED lighting device of the present invention when lighting.

The invention has been described above in terms of the preferred embodiments, and it should be understood by those skilled in the art that the present invention is not intended to limit the scope of the invention. It should be noted that variations and permutations equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of protection of the present invention is defined by the scope of the patent application.

1000‧‧‧LED lighting equipment
100‧‧‧Power supply circuit
110‧‧‧Power supply
120‧‧‧Transformers
200‧‧‧LED lights
210‧‧‧LED chip
220‧‧‧LED drive circuit
300‧‧‧ cooling fan
300'‧‧‧Distribution fan set
310‧‧‧Fan blade sensing circuit
320‧‧‧ fan leaves
400‧‧‧LED control unit
410‧‧‧ Temperature detection circuit
411‧‧‧Temperature sensing components
420 ‧‧‧Fan control circuit
430 ‧‧‧Synchronous control circuit
450‧‧‧Variable circuit
SIN‧‧‧ input
S1‧‧‧ first output
S2‧‧‧ second output
S3‧‧‧ third output
S4‧‧‧ fourth output
OUT‧‧‧ output terminal
C1‧‧‧First Directive Telecommunications
C11‧‧‧First turn off the telecommunication number
C12‧‧‧First start signal
C2‧‧‧second indication telecommunication number
C21‧‧‧Second closed telegraph
C22‧‧‧second start telecommunication number
C23‧‧‧Second Warning Signal
V ₁ ‧‧‧First voltage
V ₂ ‧‧‧second voltage
V ₃ ‧‧‧ third voltage
V ₄ ‧‧‧fourth voltage
VC‧‧‧Stable voltage
COIL‧‧‧ coil
D1‧‧‧ diode
ZD1‧‧‧Zina diode
Q1~Q3‧‧‧Optoelectronics
R1~R10‧‧‧ resistance
RT1‧‧‧Thermistor

Fig. 1A is a block diagram showing the application of the LED control device in the first embodiment of the present invention to an LED lighting device. Fig. 1B is a block diagram showing an application of the LED control device in the second embodiment of the present invention to an LED lighting device. Fig. 2 is a block diagram showing an application of the LED control device in the third embodiment of the present invention to an LED lighting device. Fig. 3 is an internal circuit diagram of a heat dissipation fan group in an embodiment of the present invention. Figure 4 is an exploded view of an LED lighting device in accordance with an embodiment of the present invention. Fig. 5 is a schematic view showing an LED lighting device in an embodiment of the invention.

1000‧‧‧LED lighting equipment

100‧‧‧Power supply circuit

110‧‧‧Power supply

120‧‧‧Transformers

200‧‧‧LED lights

210‧‧‧LED chip

220‧‧‧LED drive circuit

300‧‧‧ cooling fan

300’‧‧‧Distribution fan set

310‧‧‧Fan blade sensing circuit

320‧‧‧ fan leaves

400‧‧‧LED control unit

410‧‧‧ Temperature detection circuit

411‧‧‧Temperature sensing components

420‧‧‧Fan control circuit

430‧‧‧Synchronous control circuit

450‧‧‧Variable circuit

SIN‧‧‧ input

S1‧‧‧ first output

S4‧‧‧ fourth output

C1‧‧‧First Directive Telecommunications

C11‧‧‧First turn off the telecommunication number

C12‧‧‧First start signal

C2‧‧‧second indication telecommunication number

C21‧‧‧Second closed telegraph

C22‧‧‧second start telecommunication number

C23‧‧‧Second Warning Signal

V ₁ ‧‧‧First voltage

V ₄ ‧‧‧fourth voltage

Claims (9)

An LED control device monitors an operation state of a cooling fan and controls an LED driving circuit of an LED lamp. The LED control device receives a voltage source from a power supply circuit, and includes: a temperature detecting circuit connected to the power supply circuit, Detecting the temperature of the LED lamp, and outputting a corresponding first indication electrical signal according to the temperature; a fan control circuit connecting the temperature detecting circuit and the fan blade sensing circuit of the cooling fan, receiving the a first indicating electrical signal of the temperature detecting circuit to control activation and deactivation of the cooling fan; and a synchronous control circuit connecting the blade sensing circuit and the LED driving circuit of the LED lamp, and receiving the blade sensing The circuit outputs a second indication electrical signal corresponding to the rotation speed of the cooling fan, and the synchronization control circuit controls activation and deactivation of the LED driving circuit according to the second indication electrical signal. The LED control device of claim 1, wherein when the temperature detecting circuit detects that the temperature of the LED lamp is higher than a rated temperature, a first shutdown signal corresponding to the first indication signal is output, the fan The control circuit turns off the operation of the heat dissipation fan after receiving the first power off signal, and the blade sensing circuit returns to the stop operation of the heat dissipation fan to output a second power off signal belonging to the second indicator signal, the synchronization control The circuit controls the LED driving circuit to be turned off after receiving the second off signal. The LED control device of claim 2, when the temperature detecting circuit detects that the temperature of the LED light is lower than a starting temperature, outputting a first starting electrical signal belonging to the first indicating electrical signal, the fan controlling The circuit starts or maintains the operation of the cooling fan after receiving the first startup signal, and senses a rotation speed of a fan blade of the cooling fan through the blade sensing circuit, and the fan is rotated when the rotation speed is higher than a rated rotation speed The leaf sensing circuit outputs a second starting electrical signal belonging to the second indicating electrical signal, and the synchronous control circuit controls the LED driving circuit to be turned on after receiving the second starting electrical signal. The LED control device of claim 3, wherein the blade sensing circuit outputs a second warning signal belonging to the second indication signal when the rotation speed is lower than the rated speed, and turns off the operation of the cooling fan. The synchronous control circuit controls the LED driving circuit to cause the LED lamp to issue a warning after receiving the second warning electrical signal. The LED control device of claim 3, wherein the temperature detecting circuit comprises a first resistor, a second resistor, a third resistor, a thermistor and a comparator, the first resistor and the second The resistors are connected in series to form a first resistor string, the third resistor is connected in series with the thermistor to form a second resistor string, and an inverting input terminal of the comparator is connected between the first resistor and the second resistor a positive phase input terminal of the comparator is connected between the third resistor and the thermistor, the first resistor string and the second resistor string are connected in parallel with the comparator, wherein the first resistor, the second The resistor and the third resistor are configured to set the nominal temperature and the starting temperature. The LED control device of claim 4, wherein the synchronous control circuit controls the LED drive circuit to intermittently illuminate the LED light after receiving the second warning signal. The LED control device according to any one of claims 1 to 6, further comprising a voltage stabilizing circuit disposed between the power supply circuit and the temperature detecting circuit to provide a stable voltage to the temperature detecting circuit . An LED lighting device comprising a power supply circuit, an LED lamp, a cooling fan, and an LED control device according to any one of claims 1 to 5, wherein the power supply circuit is connected to the LED lamp, the cooling fan, and The LED control device, wherein the LED control device is disposed in the heat dissipation fan. The LED lighting device of claim 8, wherein the cooling fan has a hole to expose the temperature detecting circuit on the LED control device, the hole facing the LED lamp.