WO2010048872A1

WO2010048872A1 - Led lamp and the control circuit thereof

Info

Publication number: WO2010048872A1
Application number: PCT/CN2009/074625
Authority: WO
Inventors: 吴俊纬
Original assignee: 广州南科集成电子有限公司
Priority date: 2008-10-27
Filing date: 2009-10-26
Publication date: 2010-05-06

Abstract

A LED lamp and the control circuit thereof, wherein the LED lamp comprises a LED heat sinking substrate (20), a metal heat dissipating member (30), a heat dissipating fan (40), a casing (50), and a driving circuit board member (60), at least one LED chip (10) is connected to the LED sinking substrate (20), the metal heat dissipating member (30) is disposed between the heat dissipating fan (40) and the LED sinking substrate (20), and the control circuit comprises a rectification and filter circuit (1), a LED load (3), a constant current source (4), and a fan circuit (6), the alternating current is converted into the direct current via the rectification and filter circuit (1) and the output terminal (A) and the ground terminal (G) are formed, the LED load (3) and the constant current source (4) are connected in series between the output terminal (A) and the ground terminal (G).

Description

LED luminaire and its control circuit

The present invention relates to an LED lamp. Additionally, the invention relates to a control circuit for an LED luminaire.

Say

Background technique

LEDs have the advantages of high luminous efficiency, power saving and long life, and their applications are becoming more and more widespread. LED lamps for daily indoor lighting are also becoming more and more popular. The book LED is applied to daily lighting. In order to meet the illumination requirement, a plurality of power LEDs are generally concentrated on one lamp, so the heat dissipation of the LED becomes an important factor affecting the use state and life of the LED lamp, especially for high-power LED lamps. The heat dissipation problem has become a technical bottleneck affecting its wide application. The existing LED lamps are passive heat dissipation, that is, heat dissipation by a heat sink or the like of the heat sink. In order to improve the heat dissipation effect, it is necessary to increase the heat dissipation area as much as possible, thereby causing the existing LED lamps to have a large overall volume, and the heat dissipation structure Complex, and its heat dissipation is not satisfactory. At present, there is no precedent for active heat dissipation by adding a cooling fan in LED lamp applications. Therefore, the prior art has the following disadvantages: the structure is complicated, the volume is large, the heat dissipation effect is poor, and the service life is short.

In the control circuit of the LED lamp, although the power consumption of the LED is not large, it requires that the required current and voltage of the power supply are relatively stable within a certain range, and at the same time, it is required to have a certain overcurrent and overvoltage protection effect on the LED. The power supply for solving such a load is usually a constant current or a regulated power supply, and an overcurrent protection circuit for an abnormal condition of some components in the load is also required in the power supply circuit, which makes the power supply have many components. The drawback is that the circuit is complicated and the power consumption ratio is large. Figure 3 is a conventional isolated switching power supply voltage regulator circuit. The so-called "isolated type" means that the ground terminals on both sides of the transformer are independent. The voltage at the power supply output of this circuit can be kept stable, but due to the LED The on-voltage will drop after long-term operation at high temperatures, so if the voltage across the LED remains the same, its operating current will increase. So in the practical application of the voltage regulator circuit, use one After a period of time, the phenomenon that the LED is burned due to the increase of current often occurs, shortening the service life. Figure 4 is a conventional non-isolated power supply constant current circuit. Although this circuit can ensure the current at the output terminal is stable, in the case where multiple loads are connected in parallel, the current will be unevenly distributed in each branch. So that after the LED is burned in one way, it is easy to accelerate the burning of all the branch LEDs. Moreover, the voltage regulator or constant current circuit represented by the above two circuits has many additional components, and these components will consume a large amount of power, especially the power transistor, so that the originally power-saving LED application is not

Say

To achieve energy saving and consumption.

"MOSFET" is the abbreviation of "metal-oxide-semiconductor field effect transistor", which means "metal oxide semiconductor field effect transistor". Its principle is the basis of all modern integrated circuit chips. A depletion MOSFET device consists of three basic parts of the book: source (S), gate (G), and drain (D). An N-channel depletion MOS FET is adjacent to the gate surface between the source and the drain, and has a shallow doped layer of the same polarity as the source and drain to connect the source to the drain. When the gate and source voltages are positive, their saturation conduction current also increases with voltage increase, which is the same as the enhanced MOS field effect transistor. However, when the gate and the source are at the same potential, when the drain is applied with a positive voltage, the depletion tube first passes through a linear region where the current rapidly rises, and then enters a saturation region where the constant current is turned on, and the drain voltage at this time is called As the saturation voltage, the magnitude of the drain-on current is related to the concentration and depth of the shallow doped layer. The larger the concentration and depth, the larger the current. When a negative voltage is applied between the gate and the source, the channel can be turned off and the on current is zero. The gate voltage at this time is defined as the turn-on voltage, but if the channel concentration is too thick and the depth is too deep, the gate The pole will not be able to cut off the channel current. The depletion mode MOS transistor has a constant current conduction when the gate and source voltages are zero, which makes it inferior to the enhanced MOS transistor in logic application, so it has not been isolated by the industry. Make the device to use. Since the depletion mode MOS transistor is turned on when the gate voltage is zero and its current is substantially in the saturation region until the drain avalanche breakdown when the drain voltage is increased, it can be used as a constant current source.

SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a simple structure. Description

LED lamps with small size, good heat dissipation and long service life. In addition, the present invention also provides a control circuit for the LED lamp, which has the advantages of simple structure, high efficiency, low power consumption, energy saving, and can prolong the service life of the lamp. The LED lamp of the present invention comprises: an LED heat dissipating substrate, a metal heat dissipating member, a casing, and a driving circuit board assembly, wherein the LED heat dissipating substrate is fixedly connected to at least one LED chip, the metal The heat dissipating member is connected to the LED heat dissipating substrate and is configured to dissipate heat. The driving circuit board assembly is located in the housing, the LED lamp further includes a heat dissipating fan, and the metal heat dissipating member is located at the heat dissipating fan and the LED heat dissipating Between the substrates.

The LED lamp further includes a reflector, and the LED heat sink together with the LED chip is located in the reflector.

The reflector is made of a thermally conductive metal material, and the tail of the reflector is in contact with the metal heat sink and dissipates heat.

The LED lamp further includes a ring member, a mounting elastic piece, and a clip. The ring member is sleeved at an opening of the reflector cup, and the mounting elastic piece and the clip are connected to the ring member.

The LED luminaire further includes a fixing seat, and the metal heat dissipating member and the cooling fan are fixedly connected through the fixing base.

A circumference of each of the LED chips is fixedly connected to a periphery of each of the LED chips, and the circumference is filled with a phosphor and an optical resin.

The LED heat dissipation substrate is provided with an LED shield along with an exterior of the LED chip.

The housing is provided with a heat dissipation hole.

The metal heat sink is a finned heat sink. The technical scheme adopted by the control circuit of the LED lamp of the invention is: The control circuit of the LED lamp of the invention comprises a rectifying and filtering circuit and an LED load, and the alternating current is rectified and filtered by the rectifying and filtering circuit to become a direct current to form an output end and ground. The control circuit of the LED lamp further includes a constant current source device and a fan circuit. The LED load and the constant current source device are connected in series to form a loop between the output end and the ground end. Instruction manual

The control circuit of the LED lamp further includes a voltage stabilizing circuit, the voltage stabilizing circuit is connected to the rectifying and filtering circuit, and the alternating current is rectified and filtered by the rectifying and filtering circuit to become a direct current, and then stabilized by the stabilizing circuit. The voltage is the LED load between the output terminal and the ground terminal, and the constant current source device provides a constant voltage direct current.

The voltage stabilizing circuit is a switching power supply, and the voltage stabilizing circuit includes a power factor correction circuit.

The fan circuit is connected in series with the LED load and the constant current source device and connected between the output end and the ground end; or the fan circuit takes out DC power supply from the voltage stabilizing circuit.

The constant current source device is a depletion field effect transistor, the drain of the depletion field effect transistor is a junction, and the source of the depletion field effect transistor is shorted to the gate phase to form another junction.

The LED load includes at least one set of LEDs connected in series.

Each set of said LEDs is connected in series with one of said constant current source devices, and a plurality of sets connected in series are connected in parallel as a whole between said output terminal and said ground terminal.

Alternatively, each set of the LEDs is connected in series and then connected in series with the constant current source device as a whole. The fan circuit includes a fan control module and a shunt resistor, and the fan control module is connected in parallel with the shunt resistor.

The control circuit of the LED lamp further includes a short circuit protection circuit, and the short circuit protection circuit is connected between the input end of the alternating current power source and the rectifying and filtering circuit. The LED light fixture of the present invention includes an LED heat dissipation substrate and a metal heat sink. The LED heat dissipation substrate is fixedly connected to at least one LED chip, and the metal heat sink is connected to the LED heat dissipation substrate and is conductive. The LED lamp further includes a heat dissipating fan, and the metal heat dissipating member is located between the heat dissipating fan and the LED heat dissipating substrate. When the lighting operation of the present invention is performed, the heat dissipating fan also operates together, and the LED chip emits light. Heat is generated, and the generated heat is conducted to the metal heat sink through the LED heat sink substrate, and the metal heat sink emits a part of heat into the surrounding air like the "passive" heat sink of the existing heat sink. At the same time, under the action of the cooling fan, another part of the heat is sucked by the cooling fan. Description

Walking or blowing away, the forced cooling effect of "active" heat dissipation is generated, so the heat dissipation effect is good, the LED chip can be prevented from working at high temperature, and the service life is effectively extended. Due to the existence of forced heat dissipation, the metal heat sink can be reduced. The volume of the LED lamp of the invention is simple, small in size, good in heat dissipation effect and long in service life;

Since the reflector of the LED lamp of the present invention is made of a heat conductive metal material, the tail of the reflector is in contact with the metal heat sink and dissipates heat, so the reflector can also dissipate heat generated when the LED chip operates. Therefore, the LED lamp of the invention has better heat dissipation effect;

Since the LED lamp of the present invention further includes a ring member, a mounting elastic piece, and a clip, the ring member is sleeved at the opening of the reflector cup, and the mounting elastic piece and the clip are connected to the ring member, The invention can be installed as a ceiling lamp on a ceiling, so that the LED lamp of the invention has a wide application range;

Since the LED heat dissipation substrate of the present invention is fixedly connected with a bank around the periphery of each of the LED chips, the bank is filled with a phosphor and an optical resin, and the bank is filled with fluorescence during the production process. In the case of powder and optical resin, the phosphor and the optical resin do not overflow, and the effect is good, so the LED lamp of the present invention has high production efficiency;

Since the control circuit of the LED lamp of the present invention comprises a rectifying and filtering circuit, an LED load, a constant current source device, and a fan circuit, the alternating current is rectified and filtered by the rectifying and filtering circuit to become a direct current, and an output end and a ground end are formed. The constant current source device is connected in series to form a loop between the output end and the ground end, and the invention creatively combines the fan circuit with the LED load and the constant current source device. When the LED load is working, at the same time, the fan circuit drives the fan to operate, and the active forced ventilation and heat dissipation, so the heat dissipation effect far exceeds the existing passive heat dissipation, and the LED chip can be prevented from working at a high temperature, effectively extending The service life, due to the existence of forced heat dissipation, can reduce the volume of other metal heat sinks, making the lamp simple in structure, small in size, good in heat dissipation effect, and long in service life; the alternating current is converted into a direct current output through the rectification and filtering circuit, even if The LED load operates at a high temperature for a long time, and when the current is intended to increase, the constant current source Member prevents current increases, the LED load and the decrease in high-temperature environment Description

The voltage is applied to the constant current source device to extend the service life of the LED load to avoid burnout. The constant current source device is used as an independent device, which is convenient for replacing the peripheral voltage regulation and current stabilization circuit of other existing circuits. The circuit component of the LED lamp of the invention has the advantages of simple structure, high efficiency, low power consumption and energy saving, and can prolong the service life of the lamp;

The control circuit of the LED lamp of the present invention further includes a voltage stabilizing circuit. After the voltage stabilizing circuit is connected to the rectifying and filtering circuit, the alternating current is rectified and filtered by the rectifying and filtering circuit to become a direct current, and then the voltage is regulated. The circuit voltage regulator provides a constant voltage DC power to the LED load between the output terminal and the ground terminal, and the constant voltage source device provides a stable voltage output through the rectifier filter circuit and the voltage stabilization circuit. The LED lamp has more stable operation, higher efficiency and longer service life. Therefore, the control circuit of the LED lamp of the invention has both constant current and constant voltage functions, higher performance and longer service life;

Since the control circuit of the LED lamp of the present invention further includes a short circuit protection circuit, the short circuit protection circuit is connected between the input end of the alternating current power source and the rectifying filter circuit, so the control circuit of the LED lamp of the invention has overcurrent and overvoltage Protective function.

DRAWINGS

1 is a schematic exploded view of an LED lamp of the present invention;

2 is a schematic cross-sectional view of the LED lamp shown in FIG. 1;

3 is a schematic diagram of a conventional isolated switching power supply voltage stabilizing circuit;

4 is a schematic diagram of a conventional non-isolated power supply constant current circuit;

Figure 5 is a schematic view showing the first embodiment of the control circuit of the LED lamp of the present invention;

6 is a schematic diagram of Embodiment 2 of a control circuit of the LED lamp of the present invention;

7 is a schematic view showing Embodiment 3 of a control circuit of the LED lamp of the present invention;

Fig. 8 is a schematic view showing the fourth embodiment of the control circuit of the LED lamp of the present invention. Instruction manual

detailed description

Embodiment 1 As shown in FIG. 1 and FIG. 2, the LED lamp of this embodiment is a downlight applied to a ceiling, and includes an LED heat dissipation substrate 20, a metal heat sink 30, a heat dissipation fan 40, a casing 50, and a driving circuit board. The assembly 60, the reflector 70, the fixing base 34, the ring member 81, the mounting elastic piece 82, and the clip 83 are fixedly connected to the four LED chips 10 (ie, the LED load 3 in the control circuit). On the LED heat dissipation substrate 20, a bank 21 is fixedly connected to the periphery of each of the LED chips 10, and the bank 21 is filled with a phosphor and an optical resin, and the bank 21 is made in the production process. When the phosphor and the optical resin are filled, the phosphor and the optical resin do not overflow, and the effect is good, and the production efficiency is high. The LED heat dissipation substrate 20 is provided with an LED shield 90 along the outside of the LED chip 10, and the metal heat sink is provided. 30 is a finned heat sink, and the housing 50 is provided with a heat dissipation hole 51. The metal heat sink 30 is connected to the LED heat dissipation substrate 20 and conducts heat dissipation. The heat dissipation fan 40 and the driving circuit board are provided. An assembly 60 is located within the housing 50, The metal heat sink 30 is located between the heat dissipation fan 40 and the LED heat dissipation substrate 20, and the metal heat sink 30 and the heat dissipation fan 40 are fixedly connected by the fixing base 34. The LED heat dissipation substrate 20 The reflector 100 is made of aluminum, and the reflector 70 can also be made of aluminum. The tail of the reflector 70 is in contact with the metal heat sink 30. And the heat dissipation, the ring member 81 is sleeved at the opening of the reflector cup 70, the ring member 81 has a decorative effect and also facilitates the embedding of the ceiling into the ceiling, the mounting elastic piece 82, the clip 83 and the ring The members 81 are connected to facilitate the insertion of the ceiling. When the LED lamp of the present invention is in operation, the heat dissipation fan 40 also operates together, and the LED chip 10 generates heat when it emits light, and the generated heat is transmitted to the metal heat sink 30 through the LED heat dissipation substrate 20. The metal heat sink 30 dissipates a part of the heat into the surrounding air like the "passive" heat sink of the existing heat sink, and at the same time, under the action of the heat radiating fan 40, another part of the heat is used by the cooling fan. 40 sucks away or blows away, which produces a forced cooling effect of "active" heat dissipation, so the heat dissipation effect is good, and the LED chip 10 can be prevented from being heated at a high temperature. Description

Under the work, the service life is effectively extended, and the volume of the metal heat sink 30 can be reduced due to the existence of forced heat dissipation. In summary, the LED lamp of the present invention has a simple structure, a small volume, a good heat dissipation effect, and a long service life. According to the comparison test, under the same conditions, the LED lamp with the same power of 80W can work at a temperature of 80 °C without the cooling fan, and in the case of the cooling fan of the invention, the operating temperature can be It is seen that the temperature is lowered to 40 ° C. Thus, the present invention greatly improves the heat dissipation effect of the LED lamp. As shown in FIG. 5, the fan-equipped high-power LED lamp circuit of the embodiment includes a rectification filter circuit 1, a voltage stabilization circuit 2, an LED load 3, a constant current source device 4, a short circuit protection circuit 5, and a fan circuit 6, and an AC current. The rectifying and filtering circuit 1 rectifies and filters into a direct current to form an output terminal A and a ground terminal G. After the voltage stabilizing circuit 2 is connected to the rectifying and filtering circuit 1, the alternating current is rectified and filtered by the rectifying and filtering circuit 1. After being DC, the regulator circuit 2 is regulated to provide the fan circuit 6, the LED load 3, and the constant current source device 4 between the output terminal A and the ground terminal G. The rectifying and filtering circuit 1 includes a bridge rectifier circuit composed of four rectifying diodes D1, D2, D3, and D4 and a filter capacitor C1. The short circuit protection circuit 5 includes a fuse F1 and a varistor RV1. The overcurrent and the short circuit protection are connected between the input end of the AC power source and the rectifying and filtering circuit 1. The fan circuit 6 includes a fan control module F1 and a shunt resistor R10, the fan control module F1 and the shunt resistor. R10 phase parallel The constant current source device 4 is a depletion field effect transistor, the drain of the depletion field effect transistor is a contact, and the source of the depletion field effect transistor is shorted with the gate electrode to form another contact. The voltage stabilizing circuit 2 is a switching power supply, the voltage stabilizing circuit 2 includes a power factor correction circuit IC1, and the power factor correction circuit IC1 uses a power supply PFC power factor control circuit of the model L6561 produced by the ST company, which has a circuit. It is widely used in power supply circuits that require power factor correction, such as energy-saving lamps, and its peripheral components include capacitors C2 to C6, resistors R1 to R9, diodes D5 to D7, MOS transistors Q1, and transformer T1. The LED load 3 includes a plurality of LEDs connected in series, the LEDs being connected in series with one of the constant current source device 4 and the fan circuit 6, and connected to the output terminal A and the a circuit is formed between the ground terminals G, and a plurality of the LEDs are connected in series Description

The quantity depends on the voltage V _Q at the output of the voltage stabilizing circuit 2, the voltage V _D across the constant current source device 4, the voltage V _Fan across the fan circuit 6, and the average conduction of each of the LEDs. Depending on the voltage V _F , generally, the operating voltage of the constant current source device 4 is 2 to 10 V, and the operating voltage of the fan circuit 6 is 5 to 12 V, so that the number of the LEDs is approximately equal to (V _Q — V _D — V _Fan ) / V _F , the input voltage of the general AC power supply is 220V AC, which is rectified and filtered by the rectifying and filtering circuit 1 to become an average DC of 300V, which can be stabilized by the voltage regulator circuit 2 of the present invention. It becomes a constant voltage output of 400 V. Therefore, the power consumption of the constant current source device 4 and the fan circuit 6 accounts for a small proportion of the entire circuit, and the power efficiency of the entire circuit is high. The depletion field effect transistor described in the control circuit of the present invention can be fabricated by the following method:

(1) thermally oxidizing the upper surface of the P-type silicon substrate in an oxidation furnace tube to form an oxide protective film, and then performing photolithography on the photolithography machine using a first photolithography plate, and then using an etching solution containing HF Oxide protective film etching;

(2) implanting boron difluoride or boron ion P-type into the silicon substrate, and then driving at a high temperature to form a P+ guard ring and a P+ contact region in contact with the silicon substrate;

(3) performing photolithography on the photolithography machine using a second photolithography plate, etching the oxide layer by a dry etching process, and then implanting the arsenic ions or pity ions or both into the silicon substrate by using an ion implanter. Forming an N+ heavily doped region, ie forming an N+ source region, an N+ drain region, and an N+ guard ring;

(4) Photolithography is performed on the photolithography machine using a third photolithography plate, and the oxide layer of the barrier region is etched with an HF-containing etching solution, and then an oxide layer is formed by high-temperature dry oxygen or wet oxygen, and then pour ions or extra Re-injecting boron ions, and then driving them at a high temperature to form an N-channel region and an oxide layer;

(5) performing photolithography on the photolithography machine using a fourth photolithography plate, and etching the oxide layer by an etching process to form a drain via, a source N+ via, and a substrate P+ via;

(6) depositing a metal layer by sputtering or evaporation, and then performing photolithography on the photolithography machine using a metal layer photolithography mask, and etching the metal layer by a dry or wet etching process to form a drain metal , source metal, gate metal and connecting metal. In this embodiment, a stable voltage output is obtained by the rectifying and filtering circuit 1 and the voltage stabilizing circuit 2, even if the LED load 3 is operated for a long time at a high temperature, when the current is intended to increase, the constant The flow source device 4 can block the current from increasing, and can apply a voltage dropped by the LED load 3 under high temperature environment operation to the constant current source device 4, prolonging the service life of the LED load 3, and avoiding burning. As a separate device, the constant current source device 4 can easily replace the peripheral voltage regulation and current stabilization circuits of other existing circuits, so that the circuit components are greatly reduced, the circuit is simple, and the service life of the load can be prolonged. The saturation current of the depletion field effect transistor at the same potential of the gate and the source can be adjusted according to the current requirement of the LED, so that a constant current supply can be provided to the LED; although the voltage of the voltage regulator circuit 2 is

Say

The output voltage is stable, but since the voltage will drop under high temperature operating conditions for a long time, the voltage drop will be added between the drain and source of the depletion field effect transistor without Affecting the LED as a load; at the same time, when the output voltage is unstable, especially above normal voltage, the high voltage portion will be added between the drain and the source of the depletion field effect transistor. It does not affect the LED as a load, so it can achieve the function of constant current protection for the LED. Therefore, the present embodiment is capable of simultaneously providing a voltage and current stable output to the load, and is particularly suitable for an LED load having a high lifetime. It can be seen that the circuit of the invention has the advantages of simple structure, high efficiency, low power consumption and energy saving, and can prolong the service life of the lamp. Embodiment 2: As shown in FIG. 6, the difference between this embodiment and the first embodiment is that: the LED load 3 of the embodiment includes four sets of LEDs connected in series, and each set of the LEDs is combined with one of the LEDs. The constant current source device 4 is connected in series, and the four groups connected in series and then connected in parallel as a whole are connected in series with the fan circuit 6, so that there are four constant current source devices 4 in this embodiment. In this embodiment, the number of the LEDs connected in series is calculated in the same manner as in the first embodiment.

The remaining features of this embodiment are the same as those of the first embodiment. Embodiment 3: As shown in FIG. 7, the difference between this embodiment and the first embodiment is that: the LED load 3 of the embodiment includes four groups of LEDs connected in series, and each group of the LEDs is connected in parallel as a The whole is connected in series with the fan circuit 6 and the constant current source device 4, that is, there is only one constant current source device 4 in this embodiment. Instruction manual

The remaining features of this embodiment are the same as those of the first embodiment. Of course, as a simplified form, the voltage stabilizing circuit 2 can be omitted in the above embodiment and the direct current can be supplied only by the rectifying and filtering circuit 1, and the preliminary effect of the present invention can also be achieved. Embodiment 4: As shown in FIG. 8, the difference between this embodiment and the first embodiment is that: the fan circuit 6 of the embodiment takes a tap from the transformer T1 in the voltage stabilizing circuit 2 to provide 5~12V. The DC power supply, that is, the fan circuit 6 of the embodiment is separately supplied with the LED load 3 and the constant current source device 4. Similarly, the power consumption of the constant current source device 4 and the fan circuit 6 accounts for a small proportion of the entire circuit, and the power efficiency of the entire circuit is high.

The remaining features of this embodiment are the same as those of the first embodiment. The LED lamp of the present invention is not limited to the form of the ceiling lamp in the embodiment, and can be made into other forms such as industrial and mining lamps and applied to different places in the room, and is particularly suitable for high-power lamps. The invention overcomes the inherent deficiency of the passive heat dissipation in the prior art, and increases the active heat dissipation and the passive heat dissipation of the heat dissipation set of the lamp by adding an active heat dissipation fan, thereby greatly improving the heat dissipation effect of the LED lamp, and realizing in the field of LED lamp illumination For a unique innovation. The number of the LED chips 10 is also not limited to that described in the embodiment, and may be changed depending on the power requirements. The invention can be widely applied to the field of LED lamps.

Claims

The invention provides an LED lamp, comprising an LED heat dissipation substrate (20), a metal heat sink (30), a casing (50), and a driving circuit board assembly (60), wherein the LED heat dissipation substrate (20) is fixedly connected at least An LED chip (10), the metal heat sink (30) is connected to the LED heat dissipation substrate (20) and conducts heat dissipation, and the driving circuit board assembly (60) is located in the housing (50), The LED lamp further includes a heat dissipation fan (40), and the metal heat dissipation member (30) is located between the heat dissipation fan (40) and the LED heat dissipation substrate (20). The LED lamp of claim 1, wherein: the LED lamp further comprises a reflector (70), and the LED heat sink substrate (20) is located in the reflector (70) together with the LED chip (10) ) Inside. The LED lamp according to claim 2, wherein: the reflector (70) is made of a heat conductive metal material, and a tail portion of the reflector (70) is in contact with the metal heat sink (30) and dissipates heat. . The LED lamp according to claim 2, wherein the LED lamp further comprises a ring member (81), a mounting elastic piece (82), and a clip (83), wherein the ring member (81) is sleeved in the At the opening of the reflector (70), the mounting elastic piece (82) and the clip (83) are connected to the ring member (81). The LED lamp according to claim 1, wherein the LED lamp further comprises a fixing base (34), and the metal heat dissipating member (30) and the cooling fan (40) pass through the fixing base (34) ) Fixed connection. The LED lamp according to claim 1, wherein a plurality of dams (21) are fixedly connected to the periphery of each of the LED chips (10) on the LED heat dissipation substrate (20).堰(21) is filled with phosphor and optical resin. The LED lamp according to claim 1, characterized in that the LED heat dissipation substrate (20) is provided with an LED shield (90) together with the outside of the LED chip (10). The LED lamp according to claim 1, characterized in that: the housing (50) is provided with a heat dissipation hole (51). The LED lamp according to claim 1, wherein the metal heat sink (30) is a finned heat sink. A control circuit for the LED lamp of claim 1, comprising a rectification filter circuit

(1), the LED load (3), the alternating current is rectified and filtered by the rectifying and filtering circuit (1) to become a direct current to form an output end (A) and a ground end (G), characterized in that: the control of the LED lamp The circuit further includes a constant current source device (4), a fan circuit (6), the LED load (3), the constant current source device (4) connected in series to the output end (A) and the ground A loop is formed between the ends (G). The control circuit of the LED lamp according to claim 10, wherein: the control circuit of the LED lamp further comprises a voltage stabilizing circuit (2), wherein the voltage stabilizing circuit (2) is connected to the rectifying and filtering circuit (1) After that, the alternating current is rectified and filtered by the rectifying and filtering circuit (1) to become a direct current, and then regulated by the voltage stabilizing circuit (2) to the output terminal (A) and the ground terminal (G). The LED load (3) between the two, the constant current source device (4) provides a constant voltage direct current. The control circuit for an LED lamp according to claim 11, wherein: said voltage stabilizing circuit (2) is a switching power supply, and said voltage stabilizing circuit (2) comprises a power factor correcting circuit. 3. The control circuit for an LED lamp according to claim 11, wherein: said fan circuit (6) is connected in series with said LED load (3) and said constant current source device (4) Between the output terminal (A) and the ground terminal (G); or, the fan circuit (6) takes out a DC power supply from the voltage stabilization circuit (2). The control circuit for an LED lamp according to claim 10 or 11 or 12 or 13, wherein: said constant current source device (4) is a depletion field effect transistor, said depletion mode field effect transistor The drain is a contact, and the source of the depletion field effect transistor is shorted to the gate Claim

Form another joint. A control circuit for an LED luminaire according to claim 10 or 11 or 12 or 13, characterized in that said LED load (3) comprises at least one set of LEDs connected in series. The control circuit for an LED lamp according to claim 15, wherein: each of said LEDs is connected in series with one of said constant current source devices (4), and a plurality of groups connected in series are connected in parallel as a whole. The output terminal (A) is between the ground terminal (G) and the ground terminal (G). The control circuit for an LED lamp according to claim 15, wherein each of said groups of said LEDs is connected in parallel and connected in series with said constant current source device (4) as a whole. The control circuit for an LED lamp according to claim 10 or 11 or 12 or 13, wherein: the fan circuit (6) comprises a fan control module (F1) and a shunt resistor (R10), the fan control module (F1) is connected in parallel with the shunt resistor (R10). The control circuit for an LED lamp according to claim 10 or 11 or 12 or 13, wherein: the control circuit of the LED lamp further comprises a short circuit protection circuit (5), and the short circuit protection circuit (5) is connected to An input end of the alternating current power source is between the rectifying and filtering circuit (1).