Heat dissipation device and lamp

Abstract

The utility model relates to a heat dissipation device and a lamp. The heat dissipation device comprises a voltage division circuit, a switching circuit and a fan, and the voltage division circuit is connected with the switching circuit and the fan; the voltage division circuit is also connected with a power supply circuit in the lamp; the switching circuit is also connected with a control circuit in the lamp; the fan is further connected with a power circuit. The switching circuit and the voltage division circuit are controlled through the control circuit so as to control the fan to dissipate heat of the driving circuit of the lamp, and the heat dissipation effect of the lamp is improved while the heat dissipation cost of the lamp is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a heat dissipation device and a lamp. Background Art

[0002] There is an increasing demand for waterproof lamps in outdoor performances. It is especially important to properly handle the heat dissipation of the internal components of waterproof lamps. Since waterproof lamps require an airtight interior, the internal heat exchange of waterproof lamps prioritizes the switching power supply, light source and its driver.

[0003] Currently, the heat dissipation of the drive is relatively weak. A common practice is to select a high-temperature resistant drive, which will increase the cost; or to install a heat sink on the drive, but the passive heat dissipation method of installing a heat sink has a poor heat dissipation effect. Utility Model Content

[0004] Based on this, it is necessary to provide a heat dissipation device and a lamp that can reduce costs and improve heat dissipation effects in order to solve the above technical problems.

[0005] In a first aspect, the present application provides a heat dissipation device, the heat dissipation device comprising a voltage divider circuit, a switching circuit and a fan, the voltage divider circuit being connected to the switching circuit and the fan respectively;

[0006] The voltage divider circuit is also connected to the power supply circuit in the lamp; the switching circuit is also connected to the control circuit in the lamp; and the fan is also connected to the power supply circuit.

[0007] In one embodiment, the voltage divider circuit includes a first resistor and a plurality of second resistors connected in parallel, and the switching circuit includes first switches corresponding to the second resistors one by one:

[0008] The first end of the first resistor is connected to the fan, the second end of the first resistor is connected to the first end of each of the second resistors, the second end of each of the second resistors is connected to the first end of each of the first switches, and the second end of each of the first switches is grounded;

[0009] The first end of the first resistor is also connected to the power supply circuit, and the third end of the first switch is connected to the control circuit.

[0010] In one embodiment, the switching circuit includes a first switching circuit and a second switching circuit, and the fan includes a first fan and a second fan;

[0011] The voltage dividing circuit is respectively connected to the first end of the first switching circuit, the second end of the first switching circuit and the first end of the second switching circuit;

[0012] The third end of the first switching circuit is connected to the second end of the second switching circuit, the fourth end of the first switching circuit is connected to the speed adjustment end of the second fan, and the fifth end of the first switching circuit and the sixth end of the first switching circuit are grounded;

[0013] The third end of the second switching circuit is connected to the positive electrode of the first fan, and the fourth end of the second switching circuit is connected to the positive electrode of the second fan;

[0014] The fourth end of the first switching circuit and the seventh end of the first switching circuit are connected to the control circuit.

[0015] In one embodiment, the voltage divider circuit includes a third resistor, a fourth resistor, a fifth resistor and a sixth resistor;

[0016] The first end of the third resistor is connected to the first end of the second switching circuit, and the second end of the third resistor is connected to the first end of the fourth resistor, the first end of the fifth resistor and the first end of the sixth resistor;

[0017] The second end of the fourth resistor is grounded;

[0018] The second end of the fifth resistor is connected to the first end of the first switching circuit;

[0019] The second end of the sixth resistor is connected to the second end of the first switching circuit;

[0020] The first end of the third resistor and the first end of the fourth resistor are also connected to the power supply circuit.

[0021] In one embodiment, the first switching circuit includes a second switch and a third switch;

[0022] The first end of the second switch is connected to the first end of the third switch, the second end of the second switch is connected to the speed adjustment end of the second fan, the third end of the second switch is grounded, the fourth end of the second switch is connected to the second end of the fifth resistor, and the fifth end of the second switch is connected to the second end of the second switching circuit;

[0023] The second end of the third switch is connected to the second end of the sixth resistor, and the third end of the third switch is grounded;

[0024] The fifth end of the second switch and the sixth end of the second switch are also connected to the control circuit.

[0025] In one embodiment, the voltage divider circuit includes a seventh resistor, an eighth resistor and a ninth resistor, and the switching circuit includes a fourth switch, a first operational amplifier circuit and a second operational amplifier circuit;

[0026] The first end of the seventh resistor is connected to the fan, and the second end of the seventh resistor is connected to the first end of the eighth resistor and the first end of the ninth resistor;

[0027] The second end of the eighth resistor is grounded;

[0028] The second end of the ninth resistor is connected to the first end of the first operational amplifier circuit and the first end of the second operational amplifier circuit;

[0029] The second end of the first operational amplifier circuit is connected to the first end of the fourth switch, and the second end of the second operational amplifier circuit is connected to the second end of the fourth switch;

[0030] The third end of the fourth switch and the fourth end of the fourth switch are connected to the control circuit.

[0031] In one embodiment, the first operational amplifier circuit includes a first operational amplifier;

[0032] The first end of the first operational amplifier is connected to the second end of the ninth resistor and the second end of the first operational amplifier;

[0033] The third terminal of the first operational amplifier is connected to the first terminal of the fourth switch.

[0034] In one embodiment, the second operational amplifier circuit includes a second operational amplifier and a filter;

[0035] The first end of the second operational amplifier is connected to the second end of the ninth resistor and the second end of the second operational amplifier;

[0036] The third terminal of the second operational amplifier is connected to the first terminal of the filter, and the second terminal of the filter is connected to the first terminal of the fourth switch.

[0037] In a second aspect, the present application provides a lamp, comprising a signal board of a control circuit, a driving board of a driving circuit and a heat dissipation device as provided in any one of the first aspects, wherein the heat dissipation device is provided on the signal board and / or the driving board.

[0038] In one embodiment, a fan blade opening is provided on the signal board and / or the driving board, and the fan blade opening is used to place a fan in the heat dissipation device; and / or,

[0039] A fixing element with a preset height is arranged on the signal board and / or the driving board, and the fan in the heat dissipation device is fixed by the fixing element on the signal board and / or the driving board.

[0040] The heat dissipation device and the lamp include a voltage divider circuit, a switching circuit and a fan. The voltage divider circuit is connected to the switching circuit and the fan respectively; the voltage divider circuit is also connected to the power circuit in the lamp; the switching circuit is also connected to the control circuit in the lamp; and the fan is also connected to the power circuit. The switching circuit and the voltage divider circuit are controlled by the control circuit to control the fan to dissipate heat from the driving circuit of the lamp, thereby reducing the heat dissipation cost of the lamp and improving the heat dissipation effect of the lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 is a schematic diagram of a heat dissipation device in one embodiment;

[0043] Figure 2 is a schematic diagram of a heat dissipation device in another embodiment;

[0044] Figure 3 is a schematic diagram of a heat dissipation device in another embodiment;

[0045] Figure 4 is a schematic diagram of a heat dissipation device in another embodiment;

[0046] Figure 5 is a schematic diagram of a heat dissipation device in another embodiment;

[0047] Figure 6 is a schematic diagram of a heat dissipation device in another embodiment;

[0048] Figure 7 is a schematic diagram of a heat dissipation device in another embodiment;

[0049] Figure 8 is a schematic diagram of a heat dissipation device in another embodiment;

[0050] Fig. 9 is a first top view schematic diagram of a signal board in one embodiment;

[0051] Fig.10 is a second top view schematic diagram of a signal board in one embodiment;

[0052] Fig.11 is a third top view schematic diagram of a signal board in one embodiment;

[0053] Fig.12is a fourth top view schematic diagram of a signal board in one embodiment;

[0054] Fig.13 is a first schematic diagram of a signal board in one embodiment;

[0055] Fig.14 is a second schematic top view of a signal board in one embodiment;

[0056] Fig.15 is a first top view schematic diagram of a driving plate in one embodiment;

[0057] Fig.16 is a second top view schematic diagram of a driving plate in one embodiment;

[0058] Fig.17 is a first plan view schematic diagram of a driving plate in one embodiment;

[0059] Fig.18 FIG. 1 is a second schematic plan view of a driving plate in one embodiment.

[0060] Description of reference numerals:

[0061] 10. heat dissipation device; 101. voltage divider circuit; 102. switching circuit;

[0062] 103. Fan; 20. Power supply circuit; 30. Control circuit;

[0063] R1, first resistor; R2, second resistor; K1, first switch;

[0064] 1021, a first switching circuit; 1022, a second switching circuit; 1031, a first fan;

[0065] 1032, a second fan; R3, a third resistor; R4, a fourth resistor;

[0066] R5, fifth resistor; R6, second resistor; K2, second switch;

[0067] K3, the third switch; R7, the seventh resistor; R8, the eighth resistor;

[0068] R9, the ninth resistor; K4, the fourth switch; 1023, the first operational amplifier circuit;

[0069] 1024, a second operational amplifier circuit; OPA1, a first operational amplifier;

[0070] OPA2, second operational amplifier; Z, filter. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0072] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0073] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0074] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0075] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0076] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0077] Figure 1 FIG. 1 is a schematic diagram of a heat dissipation device in an embodiment. Figure 1 As shown, the heat dissipation device 10 includes a voltage divider circuit 101, a switching circuit 102 and a fan 103. The voltage divider circuit 101 is connected to the switching circuit 102 and the fan 103 respectively; the voltage divider circuit 101 is also connected to the power circuit 20 in the lamp; the switching circuit 101 is also connected to the control circuit 30 in the lamp; and the fan 103 is also connected to the power circuit 20.

[0078] In order not to affect the heat exchange processing of the power supply, light source and its driving circuit inside the lamp, a small-sized fan can be selected, such as fans with sizes of 17*17mm, 20*20mm, 25*25mm, 30*30mm and 40*40mm. The advantage of using a small-sized fan is that it is easy to layout the fan on the signal board or driver board of the lamp, and it is also easy to install the small-sized fan on the signal board or driver board and assemble it into a heat exchange fluid duct.

[0079] In this embodiment, if Figure 1 As shown, the voltage divider circuit 101 is connected to the switching circuit 102 and the fan 103 respectively; the voltage divider circuit 101 is also connected to the power circuit 20 in the lamp; the switching circuit 101 is also connected to the control circuit 30 in the lamp; and the fan 103 is also connected to the power circuit 20.

[0080] Assuming that the fan 103 is a two-wire fan with a fixed voltage, without affecting the hot exchange processing of the switch power supply, light source and its driver inside the lamp, the control circuit 30 controls the switching circuit 102 to disconnect or connect, so that the switching circuit 102 can switch the voltage divider circuit 101 according to the voltage required by the fan 103, so that the power supply circuit 20 can output the voltage required by the fan 103. For example, the voltage divider circuit 101 can be a circuit composed of a first resistor and a plurality of second resistors connected in parallel, the first end of the first resistor is connected to the fan 103, the second end of the first resistor is connected to the first end of each second resistor, and the second end of the second resistor is connected to the first switch corresponding to each second resistor in the switching circuit 102. At the same time, the first switch is also connected to the control circuit 30, and the corresponding second resistor is connected in series with the first resistor and then grounded by switching the first switch, so that the output voltage of the power supply circuit 20 is obtained based on the resistance values ​​of the first resistor and the second resistor, that is, the voltage required by the fan 103.

[0081] Assuming that the fan 103 is a three-wire fan with adjustable voltage, the switching circuit includes a relay, a first op amp circuit, and a second op amp circuit. When the control signal is at a low level, the control relay and the first op amp circuit are turned on. The control circuit outputs a control signal FAN3DAC to the first op amp circuit. Since the control signal FAN3DAC is a control signal with variable voltage, in order to keep the voltage value constant, the VSENSE pin of the power supply circuit 20 changes the output voltage of the power supply circuit 20 when the control signal FAN3DAC is at different voltages, thereby adjusting the fan 103 based on the output voltage of the power supply circuit 20. Among them, the first op amp circuit can prevent the current in the voltage divider circuit 101 from flowing backwards.

[0082] When the control signal is at a high level, the control relay is connected to the second op amp circuit, and the control circuit outputs the control signal FAN3PWM to the second op amp circuit. Similarly, since the control signal FAN3PWM is a control signal with a variable voltage, in order to keep the voltage value constant, the VSENSE pin of the power supply circuit 20 changes the output voltage of the power supply circuit 20 when the control signal FAN3PWM is at different voltages, thereby adjusting the fan 103 based on the output voltage of the power supply circuit 20. The second op amp circuit is different from the first op amp circuit in that the second op amp circuit also needs to convert the input PWM signal into a DAC signal.

[0083] Optionally, the main device in the power supply circuit 20 can be a device of the type of TPS5430, TPS54260DDA, TD1509P, JW5015, etc.

[0084] Optionally, the fan 103 may be a two-wire fan, a three-wire fan, a four-wire fan, etc.

[0085] Optionally, the control element in the control circuit 30 may be, but is not limited to, a microcontroller unit (MCU), a central processing unit (CPU), a digital signal processor (DSP), a field programmable gate array (FPGA), a single-chip microcomputer, or other control devices.

[0086] The embodiment of the present application provides a heat dissipation device, which includes a voltage divider circuit, a switching circuit and a fan. The voltage divider circuit is connected to the switching circuit and the fan respectively; the voltage divider circuit is also connected to the power circuit in the lamp; the switching circuit is also connected to the control circuit in the lamp; and the fan is also connected to the power circuit. The switching circuit and the voltage divider circuit are controlled by the control circuit to control the fan to dissipate heat from the driving circuit of the lamp, thereby reducing the heat dissipation cost of the lamp and improving the heat dissipation effect of the lamp.

[0087] Figure 2 FIG. 1 is a schematic diagram of a heat dissipation device in another embodiment. Figure 2 As shown, the voltage divider circuit 101 includes a first resistor R1 and a plurality of second resistors R2 connected in parallel, and the switching circuit 102 includes a first switch K1 corresponding to each of the second resistors R2; the first end of the first resistor R1 is connected to the fan 103, the second end of the first resistor R1 is connected to the first end of each second resistor R2, the second end of each second resistor R2 is connected to the first end of each first switch K1, and the second end of each first switch K1 is grounded; the first end of the first resistor R1 is also connected to the power supply circuit 20, and the third end of the first switch K1 is connected to the control circuit 30.

[0088] In this embodiment, if Figure 2 As shown, this embodiment is a heat dissipation device corresponding to the heat dissipation of the driving circuit inside the lamp when there is no remaining control port in the control circuit inside the lamp. At this time, the fan is a two-wire fan with a fixed voltage value.

[0089] The voltage value outputted from the power supply circuit 20 to the fan 103 can be determined according to the voltage value of the FB pin (or Vsense pin) of the power supply circuit 20 to the ground. The voltage values ​​of the FB pin (or Vsense pin) to the ground of different types of power supply circuits 20 are different, so the corresponding output voltage value calculation formula is different. Specifically, the voltage output calculation formula of TPS5430 is VOUT=1.221 *(1+R1 / Ra), the voltage output calculation formula of TPS54260DDA is VOUT=0.8* (1+R1 / Ra), the voltage output calculation formula of TD1509P is VOUT=1.235* (1+R1 / Ra), and the voltage output calculation formula of JW5015 is VOUT=0.8*(1+R1 / Ra). This coefficient is the voltage value of the FB pin (or Vsense pin) of the power circuit 20 to the ground. Therefore, the voltage value output to the fan 103 can be calculated by only configuring the resistance values ​​of R1 and Ra. Ra is the resistance determined according to the multiple parallel second resistors R2.

[0090] like Figure 3 As shown, Figure 3 TPS5430 is used as the main component of the power supply circuit 20, the fan 103 is a two-wire fan socket, the resistance of R1 is 20K, and in order to distinguish multiple parallel second resistors R2, the multiple parallel second resistors R2 include a second resistor R21, a second resistor R22, a second resistor R23 and a second resistor R24, the resistance of the second resistor R21 is 5.1K, the resistance of the second resistor R22 is 3.6K, the resistance of the second resistor R23 is 2.8K, the resistance of the second resistor R24 ​​is 2.26K, and the first switch K1 is specifically a 4-bit dip switch SW1.

[0091] When the control circuit 30 controls the dial 1 in the dial switch SW1 to be connected, the second resistor R21 is Ra, and the output voltage of the power circuit 20 is VOUT=1.221*(1+20 / 5.1)=6V;

[0092] When the control circuit 30 controls the dial 2 in the dial switch SW1 to be connected, the second resistor R22 is Ra, and the output voltage of the power circuit 20 is VOUT=1.221*(1+20 / 3.6)=8V;

[0093] When the control circuit 30 controls the dial 3 in the dial switch SW1 to be connected, the second resistor R23 is Ra, and the output voltage of the power circuit 20 is VOUT=1.221*(1+20 / 2.8)=9.94V≈10V;

[0094] When the control circuit 30 controls the dial 4 in the dial switch SW1 to be connected, the second resistor R24 ​​is Ra, and the output voltage of the power circuit 20 is VOUT=1.221*(1+20 / 2.26)=12V;

[0095] When the control circuit 30 controls the DIP switch 1 and DIP switch 2 in the DIP switch SW1 to be connected, the resistance value obtained by connecting the second resistor R21 and the second resistor R22 in parallel is Ra, Ra=5.1*3.6 / (5.1+3.6)=2.11, and the output voltage of the power supply circuit 20 is VOUT=1.221*(1+20 / 2.11)=12.79V;

[0096] When the control circuit 30 controls the DIP switch 1 and DIP switch 3 in the DIP switch SW1 to be connected, the resistance value obtained by connecting the second resistor R21 and the second resistor R23 in parallel is Ra, Ra=5.1*2.8 / (5.1+2.8)=1.81, and the output voltage of the power supply circuit 20 is VOUT=1.221*(1+20 / 1.81)=14.71V;

[0097] When the control circuit 30 controls the DIP switch 1 and DIP switch 4 in the DIP switch SW1 to be connected, the resistance value obtained by connecting the second resistor R21 and the second resistor R24 ​​in parallel is Ra, Ra=5.1*2.26 / (5.1+2.26)=1.566, and the output voltage of the power supply circuit 20 is VOUT=1.221*(1+20 / 1.566)=16.81V;

[0098] When the control circuit 30 controls the connection between the dial 2 and the dial 3 in the dial switch SW1, the resistance value obtained by connecting the second resistor R22 and the second resistor R23 in parallel is Ra, Ra=3.6*2.8 / (3.6+2.8)=1.575, and the output voltage of the power supply circuit 20 is VOUT=1.221*(1+20 / 1.575)=16.73V;

[0099] When the control circuit 30 controls the DIP switch 2 and DIP switch 4 in the DIP switch SW1 to be connected, the resistance value obtained by connecting the second resistor R22 and the second resistor R24 ​​in parallel is Ra, Ra=2.8*2.26 / (2.8+2.26)=1.25, and the output voltage of the power supply circuit 20 is VOUT=1.221*(1+20 / 1.25)=20.76V;

[0100] When the control circuit 30 controls the dial 3 and the dial 4 in the dial switch SW1 to be connected, the resistance value obtained by connecting the second resistor R23 and the second resistor R24 ​​in parallel is Ra, Ra=2.6*2.26 / (2.6+2.26)=1.21, and the output voltage of the power supply circuit 20 is VOUT=1.221*(1+20 / 1.21)=21.40V;

[0101] When the control circuit 30 controls the connection of the dial 1, the dial 2 and the dial 3 in the dial switch SW1, the resistance value obtained by connecting the second resistor R21, the second resistor R22 and the second resistor R23 in parallel is Ra, Ra=2.11*2.8 / (2.11+2.8)=1.20, wherein 2.11 is the resistance value obtained by connecting the second resistor R21 and the second resistor in parallel: 5.1*3.6 / (5.1+3.6)=2.11, and the output voltage of the power supply circuit 20 is VOUT=1.221*(1+20 / 1.20)=21.57V;

[0102] When the control circuit 30 controls the connection of the dial 1, the dial 2 and the dial 4 in the dial switch SW1, the resistance value obtained by connecting the second resistor R21, the second resistor R22 and the second resistor R24 ​​in parallel is Ra, Ra=2.11*2.26 / (2.11+2.26)=1.09, wherein 2.11 is the resistance value obtained by connecting the second resistor R21 and the second resistor in parallel: 5.1*3.6 / (5.1+3.6)=2.11, and the output voltage of the power supply circuit 20 is VOUT=1.221*(1+20 / 1.09)=23.62V;

[0103] When the control circuit 30 controls the connection of the dial 1, the dial 3 and the dial 4 in the dial switch SW1, the resistance value obtained by connecting the second resistor R21, the second resistor R23 and the second resistor R24 ​​in parallel is Ra, Ra=1.81*2.26 / (1.81+2.26)=1.01, wherein 1.81 is the resistance value obtained by connecting the second resistor R21 and the second resistor R23 in parallel: 5.1*2.8 / (5.1+2.8)=1.81, and the output voltage of the power supply circuit 20 is VOUT=1.221*(1+20 / 1.01)=25.40V;

[0104] When the control circuit 30 controls the connection of the dial 2, the dial 3 and the dial 4 in the dial switch SW1, the resistance value obtained by connecting the second resistor R22, the second resistor R23 and the second resistor R24 ​​in parallel is Ra, Ra=1.575*2.26 / (1.575+2.26)=0.93, wherein 1.575 is the resistance value obtained by connecting the second resistor R22 and the second resistor R23 in parallel: 3.6*2.8 / (3.6+2.8)=1.575, the output voltage of the power supply circuit 20 is OUT=1.221*(1+20 / 0.93)=27.48V, and it is not recommended to use a high voltage;

[0105] When the control circuit 30 controls the connection of DIP 1, DIP 2, DIP 3 and DIP 4 in the DIP switch SW1, the resistance value obtained by connecting the second resistor R21, the second resistor R22, the second resistor R23 and the second resistor R24 ​​in parallel is Ra, Ra=1.20*2.26 / (1.20+2.26)=0.78, and the output voltage of the power supply circuit 20 is VOUT=1.221*(1+20 / 0.78)=32.53V. It is not recommended to use high voltage.

[0106] Optionally, the resistance values ​​of the first resistor R1 and the plurality of second resistors R2 connected in parallel may be the same or different.

[0107] Optionally, the first switch may be a dip switch, a single-pole double-throw switch, or a transistor.

[0108] In the embodiment of the present application, the voltage divider circuit includes a first resistor and a plurality of second resistors connected in parallel, and the switching circuit includes a first switch corresponding to each of the second resistors; the first end of the first resistor is connected to the fan, the second end of the first resistor is connected to the first end of each second resistor, the second end of each second resistor is connected to the first end of each first switch, and the second end of each first switch is grounded; the first end of the first resistor is also connected to the power supply circuit, and the third end of the first switch is connected to the control circuit. A fan with a fixed voltage value is set in the lamp, and the first switch is used to control the connected second resistor to control the power supply circuit to output a corresponding voltage to the fan, thereby reducing the heat dissipation cost of the driving circuit in the lamp and improving the heat dissipation effect.

[0109] Figure 4 FIG. 1 is a schematic diagram of a heat dissipation device in another embodiment. Figure 4 As shown, the switching circuit 102 includes a first switching circuit 1021 and a second switching circuit 1022, and the fan 103 includes a first fan 1031 and a second fan 1032; the voltage divider circuit 101 is respectively connected to the first end of the first switching circuit 1021, the second end of the first switching circuit 1021 and the first end of the second switching circuit 1022; the third end of the first switching circuit 1021 is connected to the second end of the second switching circuit 1022, the fourth end of the first switching circuit 1021 is connected to the speed adjustment end of the second fan 1032, the fifth end of the first switching circuit 1021 and the sixth end of the first switching circuit 1021 are grounded; the third end of the second switching circuit 1022 is connected to the positive pole of the first fan 1031, and the fourth end of the second switching circuit 1022 is connected to the positive pole of the second fan 1032; the fourth end of the first switching circuit 1021 and the seventh end of the first switching circuit 1021 are connected to the control circuit 30.

[0110] In this embodiment, if Figure 4As shown, this embodiment is a heat dissipation device corresponding to the case where the control circuit inside the lamp has a remaining control port, and the drive circuit inside the lamp is cooled. At this time, the first fan 1031 is a three-wire pressure-regulated fan, and the second fan 1032 is a four-wire speed-regulated fan. Pin 1 of the first fan 1031 is the positive electrode of the first fan 1031, pin 1 of the second fan 1032 is the positive electrode of the second fan 1032, and pin 4 of the second fan 1032 is the speed-regulating end of the second fan 1032.

[0111] Figure 4 With TPS5430 as the main component of the power supply circuit 20 , the first switching circuit 1021 mainly functions to switch whether the control signal output by the control circuit controls voltage regulation or speed regulation; the second switching circuit 1022 mainly functions to switch whether the first fan 1031 or the second fan 1032 is controlled.

[0112] Specifically, when the control circuit controls the power supply circuit 20 to output a voltage, the seventh terminal of the first switching circuit 1021 is connected to the second terminal of the first switching circuit 1021 by default, and the first terminal of the second switching circuit 1022 is connected to the third terminal of the second switching circuit 1022 by default. The control circuit 30 outputs a control signal FAN12mode to the third terminal of the first switching circuit 1021 and the second terminal of the second switching circuit 1022, and the control circuit 30 outputs a control signal FAN12PWM to the seventh terminal of the first switching circuit 1021.

[0113] When the control signal FAN12mode is at a low level, the first end of the second switching circuit 1022 and the third end of the second switching circuit 1022 are controlled to remain connected, and the power supply circuit 20 supplies power to the first fan. At the same time, the seventh end of the first switching circuit 1021 is controlled to remain connected to the second end of the first switching circuit 1021, the second end of the first switching circuit 1021 is connected to the fifth end of the first switching circuit 1021, the voltage divider circuit 101 connected to the second end of the first switching circuit 1021 is grounded, and the voltage input to the first fan 1031 is adjusted by controlling the pulse width of the control signal FAN12PWM.

[0114] When the control signal FAN12mode is at a high level, the first end of the second switching circuit 1022 is controlled to be connected to the fourth end of the second switching circuit 1022, and the power supply circuit 20 supplies power to the second fan. At the same time, the first end of the first switching circuit 1021 is connected to the sixth end of the first switching circuit 1021, and the voltage divider circuit 101 connected to the first end of the first switching circuit 1021 is grounded. The seventh end of the first switching circuit 1021 is controlled to be connected to the fourth end of the first switching circuit 1021, so as to control the speed of the second fan 1031 by controlling the pulse width of the control signal FAN12PWM.

[0115] Optionally, the first switching circuit 1021 includes components such as a double-gate relay JK1, NMOS transistors Q1 and Q19, and the second switching circuit 1022 may include components such as a single-gate relay JK2 and NMOS transistor Q2.

[0116] In the embodiment of the present application, the voltage divider circuit is respectively connected to the first end of the first switching circuit, the second end of the first switching circuit, and the first end of the second switching circuit; the third end of the first switching circuit is connected to the second end of the second switching circuit, the fourth end of the first switching circuit is connected to the speed adjustment end of the second fan, the fifth end of the first switching circuit and the sixth end of the first switching circuit are grounded; the third end of the second switching circuit is connected to the positive pole of the first fan, the fourth end of the second switching circuit is connected to the positive pole of the second fan; the fourth end of the first switching circuit and the seventh end of the first switching circuit are also connected to the control circuit. In the embodiment of the present application, the control signal output by the control circuit is switched by the first switching circuit to control voltage regulation or speed regulation, and the second switching circuit switches to control the first fan or the second fan, which provides a variety of implementation methods for heat dissipation of the driving circuit in the lamp and improves the flexibility of heat dissipation of the lamp.

[0117] Continue as above Figure 4 As shown, the voltage divider circuit 101 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6; the first end of the third resistor R3 is connected to the first end of the second switching circuit 1022, and the second end of the third resistor R3 is connected to the first end of the fourth resistor R4, the first end of the fifth resistor R5 and the first end of the sixth resistor R6; the second end of the fourth resistor R4 is grounded; the second end of the fifth resistor R5 is connected to the first end of the first switching circuit 1021; the second end of the sixth resistor R6 is connected to the second end of the first switching circuit 1021; the first end of the third resistor R3 and the first end of the fourth resistor R3 are also connected to the power supply circuit 20.

[0118] Different types of power supply circuits have different output voltages. The output voltage of the power supply circuit 20 can be obtained through the voltage divider circuit 101. For example, the output voltage VOUT of TPS5430 is 1.221 * (1 + R3 / Rb), the output voltage VOUT of TPS54260DDA is 0.8 * (1 + R3 / Rb), the output voltage VOUT of TD1509P is 1.235 * (1 + R3 / Rb), and the output voltage VOUT of JW5015 is 0.8 * (1 + R3 / Rb). The difference between these output voltages is the coefficient, and this coefficient is the voltage value of the FB pin (or Vsense pin) of different types of power supply circuits to the ground. Rb is the resistance value determined by the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6.

[0119] For example, the resistance of the third resistor R3 is 20K, the resistance of the fourth resistor R4 is 4.7K, the resistance of the fifth resistor R5 is 200K, and the resistance of the sixth resistor R6 is 1.34K.

[0120] When the control signal FAN12mode is at a low level, the first end of the second switching circuit 1022 and the third end of the second switching circuit 1022 are controlled to remain connected, and the power supply circuit 20 supplies power to the first fan. At the same time, the seventh end of the first switching circuit 1021 is controlled to remain connected to the second end of the first switching circuit 1021, and the second end of the first switching circuit 1021 is connected to the fifth end of the first switching circuit 1021. The sixth resistor R6 is grounded, that is, the fourth resistor R4 and the sixth resistor R6 are connected in parallel to obtain Rb. The voltage input to the first fan 1031 is adjusted by controlling the pulse width of the control signal FAN12PWM. When the duty cycle of FAN12PWM changes from 0%-100%, the power supply circuit 20 can change from 6.4V to 24.6V.

[0121] When the control signal FAN12mode is at a high level, the first end of the second switching circuit 1022 is controlled to be connected to the fourth end of the second switching circuit 1022, and the power supply circuit 20 supplies power to the second fan. At the same time, the first end of the first switching circuit 1021 is connected to the sixth end of the first switching circuit 1021, and the fifth resistor R5 is grounded, that is, the fourth resistor R4 and the fifth resistor R5 are connected in parallel to obtain Rb. The seventh end of the first switching circuit 1021 is controlled to be connected to the fourth end of the first switching circuit 1021 to be connected to the speed regulating end of the second fan 1032, and the speed of the second fan 1031 is controlled by controlling the control signal FAN12PWM.

[0122] Optionally, the fifth resistor R5 and the sixth resistor R6 are just examples, and a plurality of resistors connected in parallel may be used as the fifth resistor R5 or the sixth resistor R6.

[0123] In the embodiment of the present application, the first end of the third resistor is connected to the first end of the second switching circuit, the second end of the third resistor is connected to the first end of the fourth resistor, the first end of the fifth resistor and the first end of the sixth resistor; the second end of the fourth resistor is grounded; the second end of the fifth resistor is connected to the first end of the first switching circuit; the second end of the sixth resistor is connected to the second end of the first switching circuit; the first end of the third resistor and the first end of the fourth resistor are also connected to the power supply circuit. In the embodiment of the present application, the fifth resistor and the sixth resistor are respectively connected in parallel with the fourth resistor through the first switching circuit and the second switching circuit to realize the fan voltage regulation and speed regulation control, and the implementation method is simple.

[0124] Figure 5 FIG. 1 is a schematic diagram of a heat dissipation device in another embodiment. Figure 5As shown, the first switching circuit 1021 includes a second switch K2 and a third switch K3; the first end of the second switch K2 is connected to the first end of the third switch K3, the second end of the second switch K2 is connected to the speed adjustment end of the second fan 1032, the third end of the second switch K2 is grounded, the fourth end of the second switch K2 is connected to the second end of the fifth resistor R5, and the fifth end of the second switch K2 is connected to the second end of the second switching circuit 1022; the second end of the third switch K3 is connected to the second end of the sixth resistor R6, and the third end of the third switch K3 is grounded; the fifth end of the second switch K2 and the sixth end of the second switch K2 are also connected to the control circuit 30.

[0125] In this embodiment, the first end of the second switch K2 and the sixth end of the second switch K2 are connected by default, and the first end of the second switching circuit 1022 and the third end of the second switching circuit 1022 are connected by default. The control circuit 30 outputs a control signal FAN12mode to the fifth end of the second switch K2, and the control circuit 30 outputs a control signal FAN12PWM to the sixth end of the second switch K2.

[0126] When the control signal FAN12mode is at a low level, the first end of the second switch K2 is connected to the sixth end of the second switch K2, and the sixth resistor R6 is connected in parallel to the fourth resistor R4 loop through the third switch K3. The control circuit 30 outputs a control signal FAN12PWM to the sixth end of the second switch K2 to control the voltage of the first fan 1031, so that the power supply circuit 20 can adjust the voltage from 6.4V to 24.6V. The voltage regulation process is: FAN12PWM is a pulse width signal. When it is always at a low level (i.e., the duty cycle of FAN12PWM is 0%), Rb=R4=4.7K, VOUT=1.221*(1+20 / 4.7)=6.4V; when the control signal FAN12PWM is always at a high level (i.e., the duty cycle of FAN12PWM is 100%), the third switch K3 is turned on by the control signal FAN12PWM, so that the sixth resistor R6 is incorporated into the loop of the fourth circuit R4, that is, Rb=R6*R4 / (R6+R4)=4.7*1.34 / (4.7+1.34)=1.0427, and the output voltage VOUT of the power supply circuit 20 is 1.221 *(1+20 / 1.0427)=24.6V; when the duty cycle of FAN12PWM changes from 0-100%, the output voltage of the power supply circuit 20 can change from 6.4V to 24.6V.

[0127] When the control signal FAN12mode is at a low level, the power supply circuit 20 is also connected to the first fan 1031 through the second switching circuit 1022 (ie, the first end of the second switching circuit 1022 and the third end of the second switching circuit 1022 are kept in a default connected state).

[0128] When the control signal FAN12mode is at a high level, the third end of the second switch K2 is connected to the fourth end of the second switch K2 to connect the fifth resistor R5 in parallel to the loop of the fourth resistor R4. At the same time, the sixth end of the second switch K2 is disconnected from the first end of the second switch K2 and connected to the second end of the second switch K2. The speed of the second fan 1032 is controlled by the control signal FAN12PWM. The calculation process can be Rb=R5*R4 / (R5+R4)=4.3*4.7 / (4.3+4.7)=2.2456, and the output voltage VOUT of the power supply circuit 20=1.221*(1+20 / 2.2456)=12V.

[0129] When the control signal FAN12mode is at a high level, the first end of the second switching circuit 1022 is also controlled to be disconnected from the third end of the second switching circuit 1022 and connected to the fourth end of the second switching circuit 1022, so as to connect the power supply circuit 20 to the positive pole of the second fan 1032 and supply power to the second fan 1032.

[0130] It should be noted that no matter whether the power circuit 20 is connected to the first fan 1031 or the second fan 1032, as long as the fan rotates, the fan pin 3 will have a pulse signal feedback. When there is no pulse signal feedback, it means that the fan has stopped rotating; when there is a pulse signal feedback from the fan pin 3, the speed measurement circuit can count the number of pulses through the IO port to calculate the speed of the fan. The speed measurement circuit is the same as the above Figure 4 The circuit connected to pin 3 of fan 103 is the same.

[0131] In the embodiment of the present application, the first switching circuit includes a second switch and a third switch; the first end of the second switch is connected to the first end of the third switch, the second end of the second switch is connected to the speed adjustment end of the second fan, the third end of the second switch is grounded, the fourth end of the second switch is connected to the second end of the fifth resistor, the fifth end of the second switch is connected to the second end of the second switching circuit; the second end of the third switch is connected to the second end of the sixth resistor, and the third end of the third switch is grounded; the fifth end of the second switch and the sixth end of the second switch are also connected to the control circuit. The embodiment of the present application switches the second switch and the third switch by a control signal to adjust the voltage and speed of the fan, thereby reducing the heat dissipation cost of the driving circuit in the lamp and improving the heat dissipation effect.

[0132] Figure 6 FIG. 1 is a schematic diagram of a heat dissipation device in another embodiment. Figure 6As shown, the voltage divider circuit 101 includes a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9, and the switching circuit includes a fourth switch K4, a first operational amplifier circuit 1023 and a second operational amplifier circuit 1024; the first end of the seventh resistor R7 is connected to the fan 103, and the second end of the seventh resistor R7 is connected to the first end of the eighth resistor R8 and the first end of the ninth resistor R9; the second end of the eighth resistor R8 is grounded; the second end of the ninth resistor R9 is connected to the first end of the first operational amplifier circuit 1023 and the first end of the second operational amplifier circuit 1024; the second end of the first operational amplifier circuit 1023 is connected to the first end of the fourth switch K4, and the second end of the second operational amplifier circuit 1024 is connected to the second end of the fourth switch K4; the third end of the fourth switch K4 and the fourth end of the fourth switch K4 are connected to the control circuit 30.

[0133] In this embodiment, if Figure 6 As shown, this embodiment is for the control circuit inside the lamp, the number of control ports is located at Figure 2 and Figure 4 In the case where the number of control ports is between the values ​​shown, the corresponding heat dissipation device is used to dissipate heat from the driving circuit inside the lamp, and the fan 103 is a three-wire voltage-regulated fan.

[0134] The control circuit 30 outputs a control signal Signalmode to the third end of the fourth switch K4. When the control signal is at a low level, the first end of the fourth switch K4 is controlled to be connected to the fourth end of the fourth switch K4. The control circuit outputs a control signal FAN3DAC, and the external voltage Vda corresponding to the control signal FAN3DAC is input to the first operational amplifier circuit 1023 to control the output voltage of the power supply circuit 20 to adjust the fan 103.

[0135] When the control signal is at a high level, the second end of the fourth switch K4 is controlled to be connected to the fourth end of the fourth switch K4, and the control circuit outputs a control signal FAN3PWM, and the external voltage Vda corresponding to the control signal FAN3PWM is input to the second operational amplifier circuit 1024, and the output voltage of the power supply circuit 20 is controlled to adjust the fan 103.

[0136] like Figure 6As shown, there are many types of main components in the power supply circuit, such as TPS5430, TPS54260DDA, TD1509P, JW5015, etc. Taking TPS5430 as an example, the loop current flowing through R7 and R8 is the same, and current = voltage / resistance, that is, 1.221 / R8=(VOUT-1.221) / R7. Among them, 1.221 is the voltage value of the Vsense pin (or FB pin) of the power supply circuit 20 to the ground. In order to realize the voltage regulation function of TPS5430, a voltage Vda is applied to the Vsense pin. When the external voltage enters the Vsense pin, an additional current flows into the loop, so 1.221 / R8=(VOUT-1.221) / R7+(Vda-1.221) / R9 is obtained. By converting the formula, we can get the output voltage VOUT of TPS5430 =1.221*(R7 / R8)-(Vda-1.221)*(R7 / R9)+1.221.

[0137] Similarly, the calculation formulas for the output voltages of TPS54260DDA, TD1509P, and JW5015 can be obtained. The output voltage VOUT of TPS54260DDA = 0.8*(R7 / R8)-(Vda-0.8)*(R7 / R9)+0.8, the output voltage VOUT of TD1509P = 1.235*(R7 / R8)-(Vda-1.235)*(R7 / R9)+1.235, and the output voltage VOUT of JW5015 = 0.8*(R7 / R8)-(Vda-0.8)*(R7 / R9)+0.8.

[0138] The difference in output voltage between different types of power supply circuits is the coefficient, which is the voltage value of the FB pin (or Vsense pin) of the power supply circuit to the ground. The output voltage can be calculated by simply configuring the resistance values ​​of R7, R8 and R9. Under the premise of not affecting the hot exchange processing of the internal switching power supply, light source and its driving circuit of the lamp, the three-wire fan voltage regulation control can be achieved in the switching circuit 102 according to the required switching signal mode.

[0139] Take R7 resistance value as 20K, R8 resistance value as 1.05K, and R9 resistance value as 2.1K as an example. In order to expand the usable range of Vda, assuming that Vda can vary between 3.28V and 0V, the output voltage value is calculated as follows: when the external voltage Vda is 3.28V, the minimum output voltage VOUT of the power supply circuit 20 is VOUT = 1.221*(20 / 1)-(3.28-1.221)*(20 / 2.1)+1.221=24.42-19.61+1.221=6.031V;

[0140] When the external voltage Vda is 1.221V, the maximum output voltage VOUT of the power supply circuit 20 is VOUT=1.221*(20 / 1)-(1.221-1.221)*(20 / 2.1)+1.221=24.42-0+1.221=25.461V.

[0141] In order to prevent the current flowing through the ninth resistor R9 from flowing backward, the first operational amplifier circuit and the second operational amplifier circuit are added, and a loop is formed through the ground pins of the first operational amplifier circuit and the second operational amplifier circuit. When the current flowing through the ninth resistor R9 merges with the current flowing through the seventh resistor R7 and flows into the eighth resistor R8, the Vsense pin of the power supply circuit 20 needs to maintain a constant voltage value of 1.221, and the output voltage can only be automatically adjusted down; when Vda is equal to or lower than 1.221, the current flowing through the seventh resistor R7 is divided into two branches flowing through the eighth resistor R8 and the ninth resistor R9, and the Vsense pin of the power supply circuit 20 needs to maintain a constant voltage value of 1.221, and the output voltage can only be automatically adjusted up.

[0142] Optionally, the fourth switch K4 may be a dip switch, or a relay or other circuit.

[0143] In an embodiment of the present application, the first end of the seventh resistor is connected to the fan, and the second end of the seventh resistor is connected to the first end of the eighth resistor and the first end of the ninth resistor; the second end of the eighth resistor is grounded; the second end of the ninth resistor is connected to the first end of the first operational amplifier circuit and the first end of the second operational amplifier circuit; the second end of the first operational amplifier circuit is connected to the first end of the fourth switch, and the second end of the second operational amplifier circuit is connected to the second end of the fourth switch; the third end of the fourth switch and the fourth end of the fourth switch are connected to the control circuit, and can be compatible with the DAC signal and the PWM signal output by the control circuit at the same time, and the fan is controlled by the DAC signal and the PWM signal.

[0144] Figure 7 FIG. 1 is a schematic diagram of a heat dissipation device in another embodiment. Figure 7 As shown, the first operational amplifier circuit 1023 includes a first operational amplifier OPA1, a first end of the first operational amplifier OPA1 is connected to the second end of the ninth resistor R9 and the second end of the first operational amplifier OPA1; a third end of the first operational amplifier OPA1 is connected to the first end of the fourth switch K4.

[0145] In this embodiment, when the control signal is at a low level, the first end of the fourth switch K4 is controlled to be connected to the fourth end of the fourth switch K4, the control circuit outputs the control signal FAN3DAC, and the external voltage Vda corresponding to the control signal FAN3DAC is input to the first operational amplifier OPA1 to control the output voltage of the power supply circuit 20 to adjust the fan 103.

[0146] Figure 8 FIG. 1 is a schematic diagram of a heat dissipation device in another embodiment. Figure 8 As shown, the second operational amplifier circuit 1024 includes a second operational amplifier OPA2 and a filter Z; the first end of the second operational amplifier OPA2 is connected to the second end of the ninth resistor R9 and the second end of the second operational amplifier OPA2; the third end of the second operational amplifier OPA2 is connected to the first end of the filter Z, and the second end of the filter Z is connected to the first end of the fourth switch K4.

[0147] In this embodiment, when the control signal is at a high level, the second end of the fourth switch K4 is controlled to be connected to the fourth end of the fourth switch K4, the control circuit outputs the control signal FAN3PWM, the control signal FAN3PWM is input to the filter Z, the control signal FAN3PWM is converted into a DAC signal, and the output voltage of the power supply circuit 20 is controlled based on the external voltage Vda corresponding to the DAC signal to adjust the fan 103.

[0148] In one embodiment, the lamp includes a signal board of a control circuit, a driving board of a driving circuit, and a heat sink as provided in any of the above embodiments, and the signal board and / or the driving board are provided with the heat sink. A fixing element of a preset height is provided on the signal board and / or the driving board, and a fan in the heat sink is fixed by the fixing element on the signal board and / or the driving board.

[0149] On the one hand: the 40*40mm fan is installed on the signal board, and installed on the upper and lower layers of the signal board and the drive board to form an air duct.

[0150] In this embodiment, if Figure 9-12 As shown, Fig. 9 is a first top view schematic diagram of a signal board in one embodiment, Fig.10 is a second top view schematic diagram of a signal board in one embodiment, Fig.11 is a third top view schematic diagram of a signal board in one embodiment, Fig.12 This is a fourth top view schematic diagram of a signal board in an embodiment. This embodiment is designed with a signal board and a drive board for the case where there is a large demand for stepper motors inside the lamp. As shown in the figure, the signal board is designed with 4 mounting holes for a 40*40mm fan and 7 fan blade openings for the fan, which are not circular through holes, so that the fan fluid can be discharged counterclockwise from the front to the back of the signal board, and the components on the back of the signal board and the heating components on the front of the drive board are cooled by air.

[0151] like Fig.13 and Fig.14 As shown, Fig.13 is a first schematic diagram of a signal board in one embodiment, Fig.14The second schematic diagram of the signal board in an embodiment is shown in FIG. When a 6.5 mm silicone pad is added between the fan and the signal board and is tightened by screws and nuts, the heating element on the front of the signal board and next to the fan can be cooled by air. This board-to-board connection and fan installation method not only saves plane design space, but also forms a good heat exchange fluid duct.

[0152] On the other hand: the 40*40mm fan is installed on the driver board, and the driver board is installed on the sheet metal inside the lamp to form an air duct.

[0153] like Figure 15-16 As shown, Fig.15 is a first top view schematic diagram of a driving plate in one embodiment, Fig.16 This is a second top view of a driver board in an embodiment. This embodiment is designed for outdoor waterproof lamps with less demand for stepper motors. Only a driver board with an MCU is designed. Four mounting holes for a 40*40mm fan are designed on the driver board, and there are seven fan blade openings for the fan, not circular through holes. When the driver board is installed on the sheet metal inside the lamp, the fan fluid can be discharged counterclockwise from the front to the back of the driver board to cool the components on the back of the driver board.

[0154] like Fig.17 and Fig.18 As shown, Fig.17 is a first plan view schematic diagram of a driving plate in one embodiment, Fig.18 This is a second plan view schematic diagram of a driving board in an embodiment. When a 6.5 mm silicone pad is added between the fan and the driving board and is tightened with screws and nuts, the heating element on the front of the driving board and next to the fan can be cooled by air.

[0155] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0156] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A heat dissipation device, characterized in that: The heat dissipation device (10) comprises a voltage divider circuit (101), a switching circuit (102) and a fan (103); the voltage divider circuit (101) is connected to the switching circuit (102) and the fan (103) respectively; The voltage divider circuit (101) is also connected to a power supply circuit (20) in the lamp; the switching circuit (102) is also connected to a control circuit (30) in the lamp; and the fan (103) is also connected to the power supply circuit (20).

2. The device according to claim 1, characterized in that The voltage divider circuit (101) comprises a first resistor (R1) and a plurality of second resistors (R2) connected in parallel, and the switching circuit (102) comprises first switches (K1) corresponding one-to-one to the second resistors (R2); The first end of the first resistor (R1) is connected to the fan (103), the second end of the first resistor (R1) is connected to the first end of each of the second resistors (R2), the second end of each of the second resistors (R2) is connected to the first end of each of the first switches (K1), and the second end of each of the first switches (K1) is grounded; The first end of the first resistor (R1) is also connected to the power supply circuit (20), and the third end of the first switch (K1) is connected to the control circuit (30).

3. The device according to claim 1, characterized in that The switching circuit (102) comprises a first switching circuit (1021) and a second switching circuit (1022); the fan (103) comprises a first fan (1031) and a second fan (1032); The voltage divider circuit (101) is respectively connected to a first end of the first switching circuit (1021), a second end of the first switching circuit (1021), and a first end of the second switching circuit (1022); The third end of the first switching circuit (1021) is connected to the second end of the second switching circuit (1022), the fourth end of the first switching circuit (1021) is connected to the speed adjustment end of the second fan (1032), and the fifth end of the first switching circuit (1021) and the sixth end of the first switching circuit (1021) are grounded; The third end of the second switching circuit (1022) is connected to the positive electrode of the first fan (1031), and the fourth end of the second switching circuit (1022) is connected to the positive electrode of the second fan (1032); The fourth end of the first switching circuit (1021) and the seventh end of the first switching circuit (1021) are connected to the control circuit (30).

4. The device according to claim 3, characterized in that The voltage divider circuit (101) comprises a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5) and a sixth resistor (R6); The first end of the third resistor (R3) is connected to the first end of the second switching circuit (1022), and the second end of the third resistor (R3) is connected to the first end of the fourth resistor (R4), the first end of the fifth resistor (R5) and the first end of the sixth resistor (R6); The second end of the fourth resistor (R4) is grounded; The second end of the fifth resistor (R5) is connected to the first end of the first switching circuit (1021); The second end of the sixth resistor (R6) is connected to the second end of the first switching circuit (1021); The first end of the third resistor (R3) and the first end of the fourth resistor (R4) are also connected to the power supply circuit (20).

5. The device according to claim 4, characterized in that The first switching circuit (1021) comprises a second switch (K2) and a third switch (K3); The first end of the second switch (K2) is connected to the first end of the third switch (K3), the second end of the second switch (K2) is connected to the speed adjustment end of the second fan (1032), the third end of the second switch (K2) is grounded, the fourth end of the second switch (K2) is connected to the second end of the fifth resistor (R5), and the fifth end of the second switch (K2) is connected to the second end of the second switching circuit (1022); The second end of the third switch (K3) is connected to the second end of the sixth resistor (R6), and the third end of the third switch (K3) is grounded; The fifth end of the second switch (K2) and the sixth end of the second switch (K2) are also connected to the control circuit (30).

6. The device according to claim 1, characterized in that The voltage divider circuit (101) comprises a seventh resistor (R7), an eighth resistor (R8) and a ninth resistor (R9); the switching circuit (102) comprises a fourth switch (K4), a first operational amplifier circuit (1023) and a second operational amplifier circuit (1024); The first end of the seventh resistor (R7) is connected to the fan (103), and the second end of the seventh resistor (R7) is connected to the first end of the eighth resistor (R8) and the first end of the ninth resistor (R9); The second end of the eighth resistor (R8) is grounded; The second end of the ninth resistor (R9) is connected to the first end of the first operational amplifier circuit (1023) and the first end of the second operational amplifier circuit (1024); The second end of the first operational amplifier circuit (1023) is connected to the first end of the fourth switch (K4), and the second end of the second operational amplifier circuit (1024) is connected to the second end of the fourth switch (K4); The third end of the fourth switch (K4) and the fourth end of the fourth switch (K4) are connected to the control circuit (30).

7. The device according to claim 6, characterized in that The first operational amplifier circuit (1023) comprises a first operational amplifier (OPA1); The first end of the first operational amplifier (OPA1) is connected to the second end of the ninth resistor (R9) and the second end of the first operational amplifier (OPA1); The third terminal of the first operational amplifier (OPA1) is connected to the first terminal of the fourth switch (K4).

8. The device according to claim 6, characterized in that The second operational amplifier circuit (1024) comprises a second operational amplifier (OPA2) and a filter (Z); The first end of the second operational amplifier (OPA2) is connected to the second end of the ninth resistor (R9) and the second end of the second operational amplifier (OPA2); The third terminal of the second operational amplifier (OPA2) is connected to the first terminal of the filter (Z), and the second terminal of the filter (Z) is connected to the first terminal of the fourth switch (K4).

9. A lamp, characterized in that: The lamp comprises a signal board of a control circuit, a driving board of a driving circuit and a heat dissipation device according to any one of claims 1 to 8, and the heat dissipation device is arranged on the signal board and / or the driving board.

10. The lamp according to claim 9, characterized in that: A fan blade opening is provided on the signal board and / or the driving board, and the fan blade opening is used to place a fan in the heat dissipation device; and / or, A fixing element with a preset height is arranged on the signal board and / or the driving board, and the fan in the heat dissipation device is fixed by the fixing element on the signal board and / or the driving board.

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