TWI521163B - A lighting apparatus with light adjusting and cooling functions and a fan of the lighting apparatus - Google Patents

Description

Lighting device with dimming and heat dissipation function and fan thereof

The invention relates to a lighting device, in particular to a lighting device having both dimming and heat dissipation functions.

According to the concept of environmental protection and energy conservation, the lighting source (such as incandescent lamps and halogen lamps) has been gradually replaced, and replaced by high luminous efficiency components, such as: energy-saving lamps or light-emitting diodes. Polar body (LED), etc. Among them, LED has the advantages of fast response, long life and not easy to be damaged, but its luminous efficiency is easily affected by the thermal energy generated during illumination, so it is necessary to use a heat sink (such as a fan) to assist in heat removal to avoid reducing the LED illumination. Performance and service life.

Please refer to FIG. 1 , which is a novel patent case of "LED lighting module with heat dissipation and automatic power-off function" of the Republic of China Announcement No. M381031, which discloses a conventional lighting device 9 which is composed of a lighting device 9 The power supply unit, the plurality of LED lighting units, and a heat dissipating member (for example, a fan or the like) are connected in series to form a series circuit. When the heat dissipating member is damaged, the power supply source of the LED lighting unit is interrupted, thereby avoiding the LED lighting unit. Overheated and damaged.

However, since the output current of the power supply unit cannot be adjusted in the series circuit, the LED lighting unit can only input a fixed current supplied by the power supply unit, and emit a light source of fixed brightness. Therefore, in the case where the luminance of the LED light-emitting unit cannot be adjusted, not only the inconvenience in use but also the application field of the illumination device 9 will be limited. system.

In summary, in the actual use of the conventional lighting device 9, in addition to the problem of "unable to adjust the brightness of the light", it will also cause "constraints in the application field". In actual use, different limitations and disadvantages are derived. The inconvenience is that further improvements are needed to enhance its practicality.

It is an object of the present invention to improve the above-mentioned disadvantages to provide an illumination device having a dimming and heat dissipation function for adjusting the brightness of the illumination source when the illumination device supplies the illumination source.

A second object of the present invention is to provide a lighting device having a dimming and heat dissipating function, which can eliminate the heat generated by the illuminating process when the illuminating device supplies the illumination source.

Another object of the present invention is to provide a fan suitable for a lighting device having a dimming and heat dissipating function, in the dimming process of the lighting device, to prevent the fan current from being too low to cause the light source to flicker.

The invention discloses a lighting device with dimming and heat dissipating function, comprising: an adjusting unit, which is provided with an electric inlet and an electric power outlet, wherein the electric power is connected to an external power supply, and the electric power is used for outputting an adjustment. The power supply unit is provided with a power transmission unit, a positive power terminal and a negative power terminal, and the power transmission unit is electrically connected to the power output unit of the adjustment unit, and the power supply unit converts the adjustment power into a stable current. The electric terminal is configured to output the steady current; a light emitting unit is provided with a first end and a second end, the first end is electrically connected to the positive end of the power supply unit; and a fan is provided with an input end and an output The input end is electrically connected to the second end of the light emitting unit, and the output end is electrically The power supply unit is connected to the negative terminal of the power supply unit. The fan includes a voltage control circuit, a driving unit and a motor. The voltage control circuit is electrically connected between the input terminal and the output terminal to generate a reference voltage. The driving unit is electrically connected to the voltage control circuit and the motor for generating a PWM signal according to the reference voltage, and driving the motor by the PWM signal.

The present invention further discloses an illumination device having a dimming and heat dissipation function, comprising: an adjustment unit, an input battery and an output power, wherein the power input is used for connecting an external power supply, and the power output is used to output a Adjusting power; a power supply unit having a power transmission port, a positive power terminal and a negative power terminal, wherein the power transmission unit is electrically connected to the power output port of the adjusting unit, and the power supply unit converts the adjusted power into a stable current, The positive terminal is configured to output the steady current; a light emitting unit is provided with a first end and a second end, the first end is electrically connected to the positive end of the power supply unit; and a fan is provided with an input end and a The output end is electrically connected to the second end of the light emitting unit, and the output end is electrically connected to the negative end of the power supply unit, the fan comprises a voltage control loop, a driving unit and a motor, and the voltage control circuit is electrically connected Connected between the input terminal and the output terminal for generating a reference voltage, the driving unit is electrically connected to the voltage control circuit and the motor for generating a DC signal according to the reference voltage, and the DC signal is generated by the DC signal Actuate the motor.

The invention further discloses a lighting device with dimming and heat dissipating function, comprising: an adjusting unit, which is provided with an electric inlet and an electric power outlet, wherein the electric power is connected to an external power supply, and the electric power is used to output one. Adjusting power; a power supply unit having a power transmission port, a positive power terminal and a negative power terminal, wherein the power transmission unit is electrically connected to the power output port of the adjusting unit, and the power supply unit converts the adjusted power into a stable current, Positive terminal for outputting the steady current An illuminating unit is provided with a first end and a second end, the first end is electrically connected to the positive end of the power supply unit; and a fan is provided with an input end and an output end, the input end is electrically connected a second end of the light emitting unit, the output end is electrically connected to the negative end of the power supply unit, the fan comprises a voltage control loop, a driving unit and a motor, wherein the voltage control loop is connected to the input by two resistors Between the end and the output end, a voltage dividing point is formed, the driving unit has a power end, a ground end, a second driving end and a reference end, and the power end and the ground end are electrically connected to the input end and the The output end is electrically connected to the motor, and the reference end is electrically connected to the voltage dividing point.

The fan is a DC fan with an automatic restart function.

Wherein, an energy storage component is disposed between the input end and the output end of the fan.

Wherein, a voltage stabilizing component is disposed between the input end and the output end of the fan.

The invention further discloses a fan for a lighting device having a dimming and heat dissipating function, the fan comprising: a voltage control loop, wherein a current is input from one end, and a reference voltage is generated by the current; a driving unit, the electric Connected to the voltage control loop, and generate a driving signal according to the reference voltage. If the reference voltage is higher than a speed threshold, the driving signal is a continuous signal, otherwise, the driving signal is a PWM signal; The motor is electrically connected to the driving unit and driven by the driving signal to drive a blade to rotate.

Wherein, when the reference voltage is lower than a stop threshold, the driving unit outputs a low level of the PWM signal.

Wherein, the voltage control loop is formed by two resistors connected in series to form a voltage dividing point. The driving unit has a reference end and two driving ends. The reference end is electrically connected to the voltage dividing point, and the driving end is electrically connected to the motor.

The fan is a DC fan with an automatic restart function.

The above and other objects, features and advantages of the present invention will become more <RTIgt; "Pulse Width Modulation" (PWM) means that each period of the pulse signal contains a high level (ie, logic 〝1〞, for example: 5 volts) and a low level (ie, logic 〝0〞). For example, 0 volts, the electronic switch can be energized and de-energized, wherein the time ratio of the high level to a single period is a duty cycle, which is understood by those of ordinary skill in the art to which the present invention pertains.

The "nominal voltage" as used throughout the present invention refers to an optimum voltage value when a fan is operated for a long time (ie, running), so that the fan can maintain a better working state, which is a technical field to which the present invention pertains. Those with ordinary knowledge can understand.

The "working voltage" as used throughout the present invention refers to the lowest voltage value that can drive a fan to operate. If the voltage is lower than the minimum voltage, the fan will stop running, which is in the technical field of the present invention. Usually the knowledge person can understand.

Please refer to FIG. 2, which is a circuit diagram of a preferred embodiment of the illumination device with dimming and heat dissipation functions of the present invention. Where the dimming The lighting device of the heat dissipation function comprises an adjusting unit 1, a power supply unit 2, a lighting unit 3 and a fan 4. The adjusting unit 1 is electrically connected to the power supply unit 2, and the power supply unit 2, the lighting unit 3 and the fan 4 are mutually connected. The series connection forms a series loop.

Preferably, the adjusting unit 1 is provided with an electronic component or circuit having a dimming function, such as a conventional TRIAC dimmer, etc., and the adjusting unit 1 is provided with an input port 11 and an output port 12, The power receiving unit 11 is electrically connected to an external power source P, for example, an AC power source, to input an AC power, and the adjusting unit 1 generates an adjusting power. For example, the adjusting unit 1 can be configured according to a user's dimming demand. The AC power is converted into an AC voltage corresponding to the dimming requirement, and the AC voltage is used as the adjustment power; the power output 12 is electrically connected to the power supply unit 2 for outputting the adjustment power, so as to The size of the adjustment power adjusts the brightness of the light-emitting unit 3 and the rotational speed of the fan 4. In this embodiment, the adjustment unit 1 is a conventional two-way controllable dimmer, but is not limited thereto.

The power supply unit 2 preferably uses an electronic component or circuit having a rectifying and steady current function, for example, a conventional rectifier circuit is combined with a constant current generating circuit, and the constant current generating circuit can be selected as a constant current integrated circuit (IC) or A constant current circuit composed of an operational amplifier (OPA), etc., is not limited thereto. The power supply unit 2 is provided with a power transmission port 21, a positive power terminal 22 and a negative power terminal 23. The power transmission port 21 is electrically connected to the power output port 12 of the adjustment unit 1 for inputting the adjustment power through the power supply unit 2 After rectifying and generating a constant current, a positive current (for example, a direct current) may be output from the positive terminal 22, and the light emitting unit 3 is connected in series between the positive terminal 22 and the negative terminal 23. And the fan 4, so as to stabilize the current and should illuminate the operating current required by the unit 3 and the fan 4 to avoid the flicker problem caused by the current instability of the lighting unit 3. In this embodiment, the power supply unit 2 is implemented by a conventional constant current generating circuit, but is not limited thereto.

The light-emitting unit 3 preferably uses a light-emitting diode composed of a light-emitting diode (LED), for example, a series, parallel or series/parallel circuit composed of a plurality of white LEDs, and the connection of the series, parallel or series/parallel circuits. The method is well understood by those skilled in the art and will not be described here. The illuminating unit 3 is electrically connected to the positive terminal 22 of the power supply unit 2 for inputting the steady current, and driving the illuminating unit 3 to convert the electric energy. For light energy, as a light source required for illumination use, wherein the brightness of the light source can be controlled by the amount of current of the steady current, which is well understood by those skilled in the art, and is not described herein; The fan 4 is connected to the fan 4 for outputting current. In this embodiment, the light-emitting unit 3 includes a plurality of LED serial groups as an implementation aspect, wherein the plurality of LED serial groups are connected in parallel with each other, and each LED serial connection group is formed by connecting several LEDs in series, but To this end, the LEDs at one end of each of the LED series are formed as an anode by the anode, and the LEDs at the other end of each LED series are formed by a cathode to form the second end 32.

The fan 4 is preferably a conventional DC-driven fan, such as a DC fan with temperature control, dustproof, waterproof, variable frequency or auto-restarting functions, but not limited thereto. The fan 4 is provided with an input end 41 and an output end 42 . The input end 41 is electrically connected to the second end 32 of the lighting unit 3 for DC current to flow from the input end 41 to the fan 4 . And driving the fan 4 to generate an air flow to dissipate the heat generated by the light-emitting unit 3 during the light-emitting process, wherein the air flow generated by the fan 4 can be controlled by the steady current, which is well understood by those skilled in the art. The output terminal 42 is electrically connected to the negative terminal 23 of the power supply unit 2, so that the current flowing from the output terminal 42 of the fan 4 can flow into the power supply unit 2 from the negative terminal 23. In this embodiment, the fan 4 is implemented as a DC fan with an automatic restart function, but is not limited thereto.

Referring to FIG. 3, it is a fan circuit embodiment (1) of a preferred embodiment of the illuminating device having a dimming and heat dissipating function, wherein the fan 4 is internally provided with a driving unit 43 and a motor 44. The driving unit 43 is preferably a motor driver having a DC signal generating function. The driving unit 43 has a power terminal 431, a grounding terminal 432 and two driving terminals 433. The power terminal 431 and the grounding terminal 432 are electrically connected to the driving terminal 43 respectively. The input terminal 41 and the output terminal 42 are configured to input the steady current, and the driving unit 43 generates a DC signal as a driving signal, and the driving end 433 is electrically connected to the stator coil of the motor 44 to drive the DC signal. The motor 44 continues to operate, and the motor 44 can drive a blade to rotate to generate airflow. In addition, an energy storage component 45 may be disposed between the input terminal 41 and the output terminal 42 to avoid sudden voltage fluctuation between the input terminal 41 and the output terminal 42. The input terminal 41 and the output terminal 42 are further connected. A voltage stabilizing element 46 can be provided to prevent the drive unit 44 from being damaged by an instantaneous high voltage impact.

In the preferred embodiment of the illuminating device having the dimming and heat dissipating function of the present invention, the stabilizing current can be generated by the power supply unit 2 for driving the illuminating unit 3 to generate a light source. At the same time, the steady current can drive the fan 4 to generate airflow to assist the light-emitting unit 3 to directly or indirectly dissipate heat, for example, : blowing the airflow to the light-emitting unit 3 or its heat-dissipating member to prevent the light-emitting unit 3 from being damaged. The steady current can be finely adjusted by the adjusting unit 1 for the user to adjust the brightness of the light emitting unit 3 according to actual needs, and the steady current can be lowered during the user's adjustment of the brightness of the light. In order to reduce the brightness of the light, and at the same time, the rotation speed of the fan 4 is slowed down, so that the heat generated by the fan 4 under low brightness can be dissipated, thereby achieving the effect of saving electricity.

It should be noted that if the fan 4 is a DC fan with an automatic restart function, the automatic restart function will be enabled when the driving voltage of the fan 4 is too low, for example, when the fan 4 is used. When the driving voltage is lower than a working voltage, the fan 4 will stop running and then restart to operate. At this time, if the driving voltage is still lower than the operating voltage, the fan 4 will stop running again, and then restart When the fan 4 is started up, the fan 4 repeatedly appears in a state of "stop operation", "re-operation", "stop operation", "re-operation", and the power supply unit 2, the light-emitting unit 3, and the fan 4 are common. The formed series circuit repeatedly exhibits a state of an off circuit, an on line, an off line, an on line, and the like, causing the light emitting unit 3 to emit light ( Glittering) situation. Therefore, in the preferred embodiment of the present invention, another circuit implementation of the fan 4 is provided, which is applicable not only to a lighting device having a dimming and heat dissipating function, but also to avoid the above-described situation of illuminating and flickering.

Referring to FIG. 4, it is a fan circuit embodiment (2) of a preferred embodiment of the illuminating device having the dimming and heat dissipating function of the present invention, wherein the fan 4 is internally provided with a driving unit 43' and the motor. 44. The energy storage component 45, the voltage regulator component 46, and a voltage control loop 47 are compared to the first real For example, the driving unit 43' selects a signal generator having a voltage-controlled pulse width modulation (PWM) signal function, and the driving unit 43' has a power terminal 431', a ground terminal 432', and two driving terminals 433'. And a reference terminal 434', wherein the power terminal 431', the ground terminal 432', the driving terminal 433', the motor 44, the energy storage component 45, and the voltage stabilizing component 46 are disposed in the same manner as the first embodiment. Do not repeat them. The reference terminal 434' is electrically connected to the voltage control circuit 47 for inputting a reference voltage, and the driving unit 43' generates a voltage control signal as the driving signal according to the reference voltage, wherein the voltage control signal is: PWM A signal or a DC signal, etc., and the voltage control signal can be output to the motor 44 by the driving end 433' for driving the motor 44 to continue to operate. Moreover, the voltage control circuit 47 can be connected in series between the input terminal 41 and the output terminal 42 by two resistors 471, and form a voltage dividing point 472, so that the current input to the input terminal 41 can be at the voltage dividing point. The voltage is connected to the reference terminal 434 ′ of the driving unit 43 ′ for outputting the reference voltage to the driving unit 43 ′, wherein the reference voltage value can be obtained by the two resistors 471 The resistance value ratio is adjusted.

It should be noted that when the light-emitting brightness of the light-emitting unit 3 is turned down, the current flowing into the input terminal 41 is gradually reduced, so that the reference voltage is lowered, and when the reference voltage is changed, the driving unit 43' will be available. The reference voltage value is adjusted in the form of a driving signal, for example, a DC signal having a high level is converted into a PWM signal having a second logic level for driving the motor 44 to continuously operate to prevent the light emitting unit 3 from emitting light. Flashing situation.

For example, when the reference voltage is still higher than a speed threshold (eg, the rated voltage or operating voltage of the motor 44, etc.), the driving unit 43' The driving signal 433' can output the DC signal having a high level (such as the reference voltage or the rated voltage of the motor 44, etc.) for driving the motor 44 to continue to operate.

Please refer to the following list 1. It is the measured voltage and current value of the power supply unit 2, the light-emitting unit 3 and the fan 4 when the reference voltage is higher than the speed threshold. It can be seen from the table that when the current value is When the current is 40.2 mA, the fan 4 can be continuously driven by the DC signal to continuously dissipate heat from the light-emitting unit 3. Therefore, the light-emitting unit 3 does not generate flicker.

On the other hand, when the reference voltage is equal to or lower than the speed threshold, the driving unit 43' can output a PWM signal from the driving end 433', and the duty cycle of the PWM signal can refer to the voltage level of the reference voltage. The bit is adjusted. For example, if the brightness of the light-emitting unit 3 is lower, the voltage level of the reference voltage is lower, and the duty cycle of the PWM signal is lower, so that the motor 44 drives the heat generated by the blade. The amount of airflow is reduced, in other words, the amount of heat dissipation can be reduced by the amount of light emitted by the light-emitting unit 3 as the brightness of the light-emitting unit 3 decreases. Therefore, when the brightness of the light is turned down, the motor 44 can be continuously driven by the PWM signal regardless of whether the reference voltage is lower than the operating voltage of the motor 44, and the light-emitting flashing of the light-emitting unit 3 is avoided.

Please refer to the following list 2, that is, the reference voltage is lower than the speed control gate. When the voltage is depreciated, the voltage and current values of the power supply unit 2, the light-emitting unit 3, and the fan 4 are as shown in the table. When the current value is as low as 22.1 mA, the fan 4 can still be driven by the PWM signal. The operation is continued to dissipate heat from the light-emitting unit 3, and therefore, the light-emitting unit 3 does not cause flicker.

Moreover, when the reference voltage is lower than a stop threshold (for example, 15% of the operating voltage of the motor 44), the amount of current input to the input terminal 41 is very low (less than 15 mA), in other words, the light-emitting unit 3 The illuminating brightness and the generated heat are very low; at this time, the illuminating unit 3 does not need to be dissipated by the fan 4, so the driving unit 43' can choose to stop generating the PWM signal, so that the driving end 433' maintains the output. The low level of the PWM signal (i.e., the duty cycle of the PWM signal is zero), thereby stopping the motor 44 to reduce the power consumption of the illumination device having the dimming and heat dissipation functions of the present invention. At this time, the input end 41 and the output end 42 of the fan 4 can be electrically connected via the voltage control circuit 47, so that the light emitting unit 3 continues to emit light.

The main features of the preferred embodiment of the illuminating device having the dimming and heat dissipating functions of the present invention are as follows: Since the adjusting unit 1 is electrically connected to the power supply unit 2, the power supply unit 2, the lighting unit 3 The fan 4 and the fan 4 are connected in series to form the series circuit. Therefore, the brightness of the light-emitting unit 3 and the rotation speed of the fan 4 can be finely adjusted through the adjusting unit 1. The steady current is generated by the power supply unit 2 for driving the light-emitting unit 3 to generate a light source, and driving the fan 4 to generate a gas flow to directly or indirectly dissipate the light-emitting unit 3 to prevent the light-emitting unit 3 from being damaged.

Moreover, the fan 4 can also be provided with the driving unit 43' and the voltage control circuit 47 for generating the reference voltage by the voltage control circuit 47 for controlling the driving signal type output by the driving unit 43', for example, a PWM signal. Or a DC signal or the like for driving the motor 44 to continue to operate.

Therefore, when the brightness of the light-emitting unit 3 is turned down, the motor 44 can be continuously driven by the PWM signal regardless of whether the reference voltage is lower than the operating voltage of the motor 44, and the fan 4 is not insufficient due to current supply. When the auto-restart mode is entered, the blinking of the light-emitting unit 3 during dimming can be avoided.

In summary, the preferred embodiment of the illuminating device having the dimming and heat dissipating function of the present invention can adjust the illuminating brightness of the illuminating unit 3 when the illuminating device provides the illuminating light source, thereby having "convenient use" and "Applicable to areas that require dimming".

Furthermore, the preferred embodiment of the illuminating device having the dimming and heat dissipating function of the present invention can eliminate the heat generated by the illuminating unit 3 during the illuminating process when the illuminating device provides the illuminating light source, thereby preventing the illuminating unit 3 from being overheated. The damage causes the fan 4 to be damaged, so that the "life extension" effect can be achieved.

In addition, the fan 4 of the preferred embodiment of the illuminating device having the dimming and heat dissipating function is applicable to the illuminating device having the function of dimming and dissipating heat, and the fan 4 is avoided during the dimming process of the illuminating device. When the current is too low, the operation is stopped, so that the light-emitting unit 3 does not blink during the illumination process. To enhance the user's comfort for the lighting source.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

〔this invention〕

1‧‧‧Adjustment unit

11‧‧‧Electricity

12‧‧‧Electricity

2‧‧‧Power supply unit

21‧‧‧Power transmission

22‧‧‧ Positive terminal

23‧‧‧Negative terminal

3‧‧‧Lighting unit

31‧‧‧ first end

32‧‧‧second end

4‧‧‧Fan

41‧‧‧ input

42‧‧‧ Output

43,43’‧‧‧ drive unit

431,431'‧‧‧ power supply

432,432'‧‧‧ Ground

433,433’‧‧‧ drive

434’‧‧‧ reference end

44‧‧‧Motor

45‧‧‧ Energy storage components

46‧‧‧Regulator components

47‧‧‧Voltage control loop

471‧‧‧Resistors

472‧‧ ‧pressure points

P‧‧‧External power supply

[study]

9‧‧‧Study lighting device

Figure 1: Schematic diagram of a conventional lighting device.

Fig. 2 is a circuit diagram showing a preferred embodiment of the illumination device with dimming and heat dissipation functions of the present invention.

Fig. 3 is a view showing a fan circuit embodiment (1) of a preferred embodiment of the lighting device with dimming and heat dissipation functions of the present invention.

Fig. 4 is a view showing a fan circuit embodiment (2) of a preferred embodiment of the lighting device with dimming and heat dissipation functions of the present invention.

1‧‧‧Adjustment unit

11‧‧‧Electricity

12‧‧‧Electricity

2‧‧‧Power supply unit

21‧‧‧Power transmission

22‧‧‧ Positive terminal

23‧‧‧Negative terminal

3‧‧‧Lighting unit

31‧‧‧ first end

32‧‧‧second end

4‧‧‧Fan

41‧‧‧ input

42‧‧‧ Output

P‧‧‧External power supply

Claims (10)

A lighting device with dimming and heat dissipating function includes: an adjusting unit, an electric inlet and an electric power outlet, wherein the electric power is connected to an external power supply, and the electric power is used for outputting an adjustment power; The power supply unit is provided with a power transmission port, a positive power terminal and a negative power terminal, and the power transmission device is electrically connected to the power output port of the adjusting unit, and the power supply unit converts the adjusted power into a stable current, and the power supply terminal uses The first light emitting unit is provided with a first end and a second end. The first end is electrically connected to the positive end of the power supply unit; and a fan is provided with an input end and an output end. The input end is electrically connected to the second end of the light emitting unit, and the output end is electrically connected to the negative end of the power supply unit, the fan includes a voltage control loop, a driving unit and a motor, and the voltage control loop is electrically connected to the The input end and the output end are used to generate a reference voltage. The driving unit is electrically connected to the voltage control circuit and the motor for generating a PWM signal according to the reference voltage, and the motor is driven by the PWM signal. A lighting device with dimming and heat dissipating function includes: an adjusting unit, an electric inlet and an electric power outlet, wherein the electric power is connected to an external power supply, and the electric power is used for outputting an adjustment power; The power supply unit is provided with a power transmission port, a positive power terminal and a negative power terminal, and the power transmission device is electrically connected to the power output port of the adjusting unit, and the power supply unit converts the adjusted power into a stable current, and the power supply terminal uses To output the stable current; An illuminating unit is provided with a first end and a second end, the first end is electrically connected to the positive end of the power supply unit; and a fan is provided with an input end and an output end, the input end is electrically connected to the a second end of the light emitting unit, the output end is electrically connected to the negative end of the power supply unit, the fan includes a voltage control circuit, a driving unit and a motor, and the voltage control circuit is electrically connected to the input end and the output end The driving unit is electrically connected to the voltage control circuit and the motor for generating a DC signal according to the reference voltage, and driving the motor by the DC signal. A lighting device with dimming and heat dissipating function includes: an adjusting unit, an electric inlet and an electric power outlet, wherein the electric power is connected to an external power supply, and the electric power is used for outputting an adjustment power; The power supply unit is provided with a power transmission port, a positive power terminal and a negative power terminal, and the power transmission device is electrically connected to the power output port of the adjusting unit, and the power supply unit converts the adjusted power into a stable current, and the power supply terminal uses The first light emitting unit is provided with a first end and a second end. The first end is electrically connected to the positive end of the power supply unit; and a fan is provided with an input end and an output end. The input end is electrically connected to the second end of the light emitting unit, and the output end is electrically connected to the negative end of the power supply unit, the fan comprises a voltage control loop, a driving unit and a motor, and the voltage control loop is composed of two resistors Connected between the input end and the output end, and form a voltage dividing point, the driving unit has a power end, a ground end, a second driving end and a reference end, and the power end and the ground end are respectively electrically connected The input and the The end, the drive end electrically connected to the horse The reference terminal is electrically connected to the voltage dividing point. A lighting device having dimming and heat dissipating functions as described in claim 1, 2 or 3, wherein the fan is a DC fan having an automatic restart function. An illumination device having a dimming and heat dissipation function as described in claim 1, 2 or 3, wherein an energy storage component is disposed between the input end and the output end of the fan. An illumination device having dimming and heat dissipation functions as described in claim 1, 2 or 3, wherein a voltage stabilizing element is disposed between the input end and the output end of the fan. A fan is used for a lighting device having a dimming and heat dissipating function, the fan comprising: a voltage control circuit, wherein a current is input from one end, and a reference voltage is generated by the current; a driving unit is electrically connected to the voltage The control circuit generates a driving signal according to the reference voltage. If the reference voltage is higher than a speed threshold, the driving signal is a continuous signal. Otherwise, the driving signal is a PWM signal; and a motor, electrical The drive unit is connected and driven by the drive signal to drive a blade to rotate. The fan of claim 7, wherein the driving unit outputs a low level of the PWM signal when the reference voltage is lower than a stop threshold. The fan of claim 7, wherein the voltage control circuit is formed by two resistors connected in series to form a voltage dividing point, and the driving unit has a reference. The terminal end is electrically connected to the voltage dividing point, and the driving end is electrically connected to the motor. The fan of claim 7, wherein the fan is a DC fan having an automatic restart function.