CN104235803A - Luminaires with active cooling - Google Patents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
技术领域technical field
本发明涉及照明装置，尤其是涉及一种具有主动散热装置的灯具。The invention relates to a lighting device, in particular to a lamp with an active cooling device.
背景技术Background technique
很多大功率灯具由于长时间工作，导致发热亮大，灯具散热至关重要。Many high-power lamps are hot and bright due to long-time work, and the heat dissipation of lamps is very important.
传统的带主动散热装置（例如风扇）的灯具，一般是由用户主动控制散热装置的开/闭，容易造成能源的浪费。Traditional lamps with active heat dissipation devices (such as fans) generally require the user to actively control the opening/closing of the heat dissipation device, which is likely to cause energy waste.
发明内容Contents of the invention
基于此，有必要提供一种能根据灯具的温度主动进行散热装置的开/闭控制的具有主动散热装置的灯具。Based on this, it is necessary to provide a lamp with an active heat sink that can actively control the on/off of the heat sink according to the temperature of the lamp.
一种具有主动散热装置的灯具，包括灯、用于对灯具进行散热的主动散热装置以及电路系统，所述电路系统包括分压单元、温度感应单元、电压比较器、开关管以及受控开关，所述受控开关包括感应端和受控端，所述受控端在感应端得电时导通、在感应端失电时截止；所述温度感应单元的输入端和分压单元的输入端连接电源输入端，所述温度感应单元的输出端和分压单元的输出端连接所述电压比较器的两个输入端，所述温度感应单元输出的电压与电源输入的电压的比值随灯的温度而变化，所述分压单元输出与电源输入的电压呈固定比例的电压，所述电压比较器的输出端与所述开关管的控制端连接，电压比较器根据两个输入端输入的电压大小比较的结果由输出端输出比较电压、控制所述开关管导通/截止，所述开关管在所述灯的温度低于散热阈值时截止、高于散热阈值时导通，所述开关管的高压端通过所述感应端连接所述电源输入端，所述开关管的低压端接地；所述受控端与所述主动散热装置串联后与所述灯并联。A lamp with an active cooling device, comprising a lamp, an active cooling device for cooling the lamp, and a circuit system, the circuit system including a voltage dividing unit, a temperature sensing unit, a voltage comparator, a switching tube and a controlled switch, The controlled switch includes a sensing end and a controlled end, the controlled end is turned on when the sensing end is powered on, and is turned off when the sensing end is de-energized; the input end of the temperature sensing unit and the input end of the voltage dividing unit connected to the input terminal of the power supply, the output terminal of the temperature sensing unit and the output terminal of the voltage dividing unit are connected to the two input terminals of the voltage comparator, the ratio of the output voltage of the temperature sensing unit to the input voltage of the power supply varies with the lamp The output of the voltage dividing unit is a voltage in a fixed ratio to the voltage input by the power supply, the output terminal of the voltage comparator is connected to the control terminal of the switch tube, and the voltage comparator is based on the voltage input by the two input terminals As a result of the size comparison, a comparison voltage is output from the output terminal to control the on/off of the switch tube. The high-voltage end of the switching tube is connected to the power input end through the sensing end, and the low-voltage end of the switching tube is grounded; the controlled end is connected in series with the active cooling device and then connected in parallel with the lamp.
在其中一个实施例中，所述受控开关是常开型继电器，所述感应端是继电器线圈，所述受控端是继电器触点。In one embodiment, the controlled switch is a normally open relay, the sensing end is a relay coil, and the controlled end is a relay contact.
在其中一个实施例中，所述分压单元包括两个串联连接的电阻，所述电压比较器的一个输入端接于所述两个串联电阻之间。In one embodiment, the voltage dividing unit includes two resistors connected in series, and one input terminal of the voltage comparator is connected between the two resistors in series.
在其中一个实施例中，所述温度感应单元包括分压电阻和正温度系数热敏电阻，所述电压比较器是运算放大器，所述运算放大器的反相输入端接于所述两个串联电阻之间，所述分压电阻一端连接所述电源输入端、另一端连接所述运算放大器的同相输入端，所述正温度系数热敏电阻一端连接所述同相输入端、另一端接地，所述开关管为N沟道MOS管，所述控制端为MOS管的栅极，所述高压端为MOS管的漏极，所述低压端为MOS管的源极。In one of the embodiments, the temperature sensing unit includes a voltage dividing resistor and a positive temperature coefficient thermistor, the voltage comparator is an operational amplifier, and the inverting input terminal of the operational amplifier is connected between the two series resistors Between, one end of the voltage dividing resistor is connected to the power supply input end, the other end is connected to the non-inverting input end of the operational amplifier, one end of the positive temperature coefficient thermistor is connected to the non-inverting input end, and the other end is grounded, and the switch The tube is an N-channel MOS tube, the control terminal is the gate of the MOS tube, the high voltage terminal is the drain of the MOS tube, and the low voltage terminal is the source of the MOS tube.
在其中一个实施例中，所述温度感应单元包括分压电阻和负温度系数热敏电阻，所述电压比较器是运算放大器，所述运算放大器的反相输入端接于所述两个串联电阻之间，所述负温度系数热敏电阻一端连接所述电源输入端、另一端连接所述运算放大器的同相输入端，所述分压电阻一端连接所述同相输入端、另一端接地，所述开关管为N沟道MOS管，所述控制端为MOS管的栅极，所述高压端为MOS管的漏极，所述低压端为MOS管的源极。In one of the embodiments, the temperature sensing unit includes a voltage dividing resistor and a negative temperature coefficient thermistor, the voltage comparator is an operational amplifier, and the inverting input terminal of the operational amplifier is connected to the two series resistors Between, one end of the negative temperature coefficient thermistor is connected to the power supply input end, the other end is connected to the non-inverting input end of the operational amplifier, one end of the voltage dividing resistor is connected to the non-inverting input end, and the other end is grounded. The switch tube is an N-channel MOS tube, the control terminal is the gate of the MOS tube, the high voltage terminal is the drain of the MOS tube, and the low voltage terminal is the source of the MOS tube.
在其中一个实施例中，所述分压电阻是可变电阻。In one of the embodiments, the voltage dividing resistor is a variable resistor.
在其中一个实施例中，所述电路系统还包括第一限流电阻、第二限流电阻及指示灯，所述第二限流电阻接于所述运算放大器的输出端与所述栅极之间，所述指示灯与所述第一限流电阻串联后接于所述运算放大器的输出端与地线之间。In one of the embodiments, the circuit system further includes a first current limiting resistor, a second current limiting resistor and an indicator light, and the second current limiting resistor is connected between the output terminal of the operational amplifier and the gate Between, the indicator light and the first current limiting resistor are connected in series between the output terminal of the operational amplifier and the ground wire.
在其中一个实施例中，所述电路系统还包括二极管，所述二极管的阳极接于所述感应端与开关管的高压端之间，所述二极管的阴极接于所述感应端与电源输入端之间。In one of the embodiments, the circuit system further includes a diode, the anode of the diode is connected between the sensing end and the high voltage end of the switch tube, and the cathode of the diode is connected between the sensing end and the power input end between.
在其中一个实施例中，所述电路系统还包括接于所述电源输入端与地线之间的滤波电容。In one of the embodiments, the circuit system further includes a filter capacitor connected between the power input terminal and the ground.
在其中一个实施例中，所述主动散热装置是风扇。In one of the embodiments, the active cooling device is a fan.
上述具有主动散热装置的灯具，开关闭合后灯得电工作，当温度感应单元检测到的灯具温度未达到散热阈值时，主动散热装置不工作，实现了灯具温度的自动检测即自动进行主动散热装置的开/闭控制，节约了能源。The lamp with the above-mentioned active heat dissipation device, after the switch is closed, the lamp is powered on and works. When the temperature of the lamp detected by the temperature sensing unit does not reach the heat dissipation threshold, the active heat dissipation device does not work, and the automatic detection of the temperature of the lamp is realized, that is, the active heat dissipation device is automatically activated. On/off control saves energy.
附图说明Description of drawings
图1是一实施例中具有主动散热装置的灯具的电路系统的电路结构图；Fig. 1 is a circuit structure diagram of a circuit system of a lamp with an active cooling device in an embodiment;
图2是另一实施例中具有主动散热装置的灯具的电路系统的电路原理图。Fig. 2 is a schematic circuit diagram of a circuit system of a lamp with an active cooling device in another embodiment.
具体实施方式Detailed ways
为使本发明的目的、特征和优点能够更为明显易懂，下面结合附图对本发明的具体实施方式做详细的说明。In order to make the objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
本发明提供一种具有主动散热装置的灯具，包括灯、用于对灯进行散热的主动散热装置以及电路系统。图1是一实施例中具有主动散热装置的灯具的电路系统的电路结构图，包括强电部分和弱电部分。其中弱电部分包括温度感应单元110、分压单元120、电压比较器130、开关管140以及受控开关感应端152；灯接于强电部分的火线和零线间，受控开关受控端154与主动散热装置160串联后、和主动散热装置160一道与灯并联，并和灯一起受到开关S的控制。受控开关受控端154在受控开关感应端152得电时导通（或闭合）、在受控开关感应端152失电时截止（或断开）。The invention provides a lamp with an active cooling device, which includes a lamp, an active cooling device for cooling the lamp and a circuit system. Fig. 1 is a circuit structure diagram of a circuit system of a lamp with an active cooling device in an embodiment, including a strong current part and a weak current part. The weak current part includes a temperature sensing unit 110, a voltage dividing unit 120, a voltage comparator 130, a switch tube 140, and a controlled switch sensing terminal 152; After being connected in series with the active cooling device 160, it is connected in parallel with the lamp together with the active cooling device 160, and is controlled by the switch S together with the lamp. The controlled switch controlled end 154 is turned on (or closed) when the controlled switch sensing end 152 is energized, and is turned off (or disconnected) when the controlled switch sensing end 152 is de-energized.
温度感应单元110的输入端和分压单元120的输入端连接直流电源输入端（Vcc），温度感应单元110的输出端和分压单元120的输出端连接电压比较器130的两个输入端。温度感应单元110输出的电压与电源输入的电压的比值随灯的温度而变化（即温度感应单元110输出的电压值随灯的温度而变化），分压单元120输出与电源输入的电压值呈固定比例的电压。电压比较器130的输出端与开关管140的控制端连接，电压比较器130根据两个输入端输入的电压大小比较的结果由输出端输出比较电压（高电平或低电平）、以控制开关管140导通/截止。开关管140的高压端通过受控开关感应端152连接电源输入端，开关管140的低压端接地。The input terminal of the temperature sensing unit 110 and the input terminal of the voltage dividing unit 120 are connected to the DC power input terminal (Vcc), and the output terminals of the temperature sensing unit 110 and the output terminal of the voltage dividing unit 120 are connected to two input terminals of the voltage comparator 130 . The ratio of the voltage output by the temperature sensing unit 110 to the voltage input by the power supply changes with the temperature of the lamp (that is, the voltage value output by the temperature sensing unit 110 changes with the temperature of the lamp), and the voltage value output by the voltage dividing unit 120 and the voltage input by the power supply are in the form of Fixed proportional voltage. The output terminal of the voltage comparator 130 is connected to the control terminal of the switch tube 140, and the voltage comparator 130 outputs a comparison voltage (high level or low level) from the output terminal according to the comparison result of the voltage input by the two input terminals to control The switch tube 140 is turned on/off. The high voltage end of the switch tube 140 is connected to the power input end through the controlled switch sensing end 152 , and the low voltage end of the switch tube 140 is grounded.
通过合理选择温度感应单元110的参数，使得其检测到的灯的温度达到散热阈值时，温度感应单元110输出的电压值与分压单元120输出的电压值相等，从而当灯具温度逐渐上升至超过散热阈值时，电压比较器130输出的电压实现翻转，开关管140由截止状态变为导通状态，受控开关感应端152得电，受控开关受控端154导通，主动散热装置160得电开始工作，对灯具进行散热。By reasonably selecting the parameters of the temperature sensing unit 110, when the temperature of the lamp detected by it reaches the heat dissipation threshold, the voltage value output by the temperature sensing unit 110 is equal to the voltage value output by the voltage dividing unit 120, so that when the temperature of the lamp gradually rises to exceed When the heat dissipation threshold is reached, the voltage output by the voltage comparator 130 is reversed, the switch tube 140 is turned from the off state to the on state, the sensing terminal 152 of the controlled switch is powered on, the controlled terminal 154 of the controlled switch is turned on, and the active cooling device 160 is turned on. The electricity starts to work to dissipate heat from the lamps.
上述具有主动散热装置的灯具，闭合开关S后灯得电工作，当温度感应单元110检测到的灯具温度未达到散热阈值时，主动散热装置160不工作，实现了灯具温度自动检测及自动进行主动散热装置160的开/闭控制，节约了能源。The above-mentioned lamps with active heat dissipation device, after the switch S is closed, the lamp is powered on to work, and when the temperature of the lamp detected by the temperature sensing unit 110 does not reach the heat dissipation threshold, the active heat dissipation device 160 does not work, realizing automatic detection of the temperature of the lamp and automatic active cooling. The on/off control of the cooling device 160 saves energy.
图2是另一实施例中具有主动散热装置的灯具的电路系统的电路原理图，该实施例中受控开关采用常开型继电器来实现，受控开关感应端是继电器线圈K，受控开关受控端是继电器触点K-1。在其它实施例中受控开关也可以采用其它元器件，例如光电耦合器，此时受控开关感应端是发光器，受控开关受控端是受光器。Fig. 2 is a schematic circuit diagram of the circuit system of a lamp with an active heat dissipation device in another embodiment. In this embodiment, the controlled switch is realized by a normally open relay, the sensing terminal of the controlled switch is the relay coil K, and the controlled switch The controlled end is the relay contact K-1. In other embodiments, the controlled switch can also use other components, such as a photoelectric coupler. At this time, the sensing end of the controlled switch is a light emitter, and the controlled end of the controlled switch is a light receiver.
在本实施例中，电压比较器是运算放大器U1，温度感应单元包括分压电阻R1和正温度系数（PTC）热敏电阻RT，分压单元包括两个串联连接的电阻R2和R3。运算放大器U1的反相输入端接于电阻R2和R3之间。分压电阻R1一端连接电源输入端Vcc、另一端连接运算放大器U1的同相输入端，正温度系数热敏电阻RT一端连接同相输入端、另一端接地。开关管为N沟道MOSFET（金属氧化物半导体场效应管）Q1，开关管的控制端为MOS管Q1的栅极，高压端为MOS管Q1的漏极，低压端为MOS管Q1的源极。可以理解的，在其它实施例中，开关管也可以用NPN型三极管代替。正温度系数热敏电阻RT可贴设于灯具外壳靠近灯的位置，以检测灯的温度。In this embodiment, the voltage comparator is an operational amplifier U1, the temperature sensing unit includes a voltage dividing resistor R1 and a positive temperature coefficient (PTC) thermistor RT, and the voltage dividing unit includes two resistors R2 and R3 connected in series. The inverting input of operational amplifier U1 is connected between resistors R2 and R3. One end of the voltage dividing resistor R1 is connected to the power input terminal Vcc, the other end is connected to the non-inverting input terminal of the operational amplifier U1, one end of the positive temperature coefficient thermistor RT is connected to the non-inverting input terminal, and the other end is grounded. The switch tube is an N-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor) Q1, the control terminal of the switch tube is the gate of the MOS tube Q1, the high voltage side is the drain of the MOS tube Q1, and the low voltage side is the source of the MOS tube Q1 . It can be understood that in other embodiments, the switch tube can also be replaced by an NPN transistor. The positive temperature coefficient thermistor RT can be attached to the position of the lamp housing close to the lamp to detect the temperature of the lamp.
在另一个实施例中，也可以将运算放大器U1的同相输入端和反相输入端的连接关系互换，同时将N沟道MOS管Q1替换为P沟道MOS管。或者将受控开关替换为常闭型继电器，同时将运算放大器U1的同相输入端和反相输入端的连接关系互换。In another embodiment, the connection relationship between the non-inverting input terminal and the inverting input terminal of the operational amplifier U1 can also be exchanged, and the N-channel MOS transistor Q1 can be replaced with a P-channel MOS transistor. Alternatively, the controlled switch is replaced by a normally closed relay, and the connection relationship between the non-inverting input terminal and the inverting input terminal of the operational amplifier U1 is exchanged.
当灯的温度在正常范围内（低于散热阈值）时，正温度系数热敏电阻RT阻值较小，正温度系数热敏电阻RT两端电压比R3上的电压（基准电压）低，此时运算放大器U1的同相输入端电压小于反相输入端电压，输出端无输出，MOS管Q1断开，继电器线圈K失电，触点K-1断开，主动散热装置（本实施例中为风扇）不工作，火线L、零线N正常为灯供电，灯正常工作。在其它实施例中，主动散热装置也可以采用其它设备，例如液冷装置等。When the temperature of the lamp is within the normal range (lower than the heat dissipation threshold), the resistance of the positive temperature coefficient thermistor RT is small, and the voltage across the positive temperature coefficient thermistor RT is lower than the voltage (reference voltage) on R3. At this time, the voltage of the non-inverting input terminal of the operational amplifier U1 is less than the voltage of the inverting input terminal, the output terminal has no output, the MOS tube Q1 is disconnected, the relay coil K is de-energized, the contact K-1 is disconnected, and the active cooling device (in this embodiment is fan) does not work, the live wire L and the neutral wire N normally supply power to the light, and the light works normally. In other embodiments, the active cooling device may also use other devices, such as a liquid cooling device.
在图2所示实施例中，电路系统还包括第一限流电阻R4、第二限流电阻R5、二极管D1、滤波电容C1及指示灯LED。第二限流电阻R5接于运算放大器U1的输出端与MOS管Q1的栅极之间，指示灯LED与第一限流电阻R4串联后接于运算放大器U1的输出端与地线之间。二极管D1的阳极接于继电器线圈K与MOS管Q1的漏极之间，二极管D1的阴极接于继电器线圈K与电源输入端Vcc之间。滤波电容C1接于电源输入端Vcc与地线之间。In the embodiment shown in FIG. 2 , the circuit system further includes a first current limiting resistor R4 , a second current limiting resistor R5 , a diode D1 , a filter capacitor C1 and an indicator LED. The second current limiting resistor R5 is connected between the output terminal of the operational amplifier U1 and the gate of the MOS transistor Q1, and the indicator LED is connected in series with the first current limiting resistor R4 and connected between the output terminal of the operational amplifier U1 and the ground. The anode of the diode D1 is connected between the relay coil K and the drain of the MOS transistor Q1, and the cathode of the diode D1 is connected between the relay coil K and the power input terminal Vcc. The filter capacitor C1 is connected between the power input terminal Vcc and the ground.
当灯的温度升高到散热阈值后，正温度系数热敏电阻RT阻值变大，使得正温度系数热敏电阻RT两端电压高于R3上的电压，即运算放大器U1的同相输入端电压高于的反相输入端，此时运算放大器U1的输出端输出高电平，高电平通过第一限流电阻R4点亮指示灯LED，指示灯LED亮起指示灯具温度过高。同时运算放大器U1的输出端通过第二限流电阻R5为MOS管Q1栅极提供高电平，使得MOS管Q1导通，继电器线圈K得电工作，触点K-1吸合，风扇得电正常工作，为灯具散热。若灯的温度恢复到散热阈值以下，风机停止工作，指示灯LED也熄灭，从而能够节约能源。When the temperature of the lamp rises to the heat dissipation threshold, the resistance of the positive temperature coefficient thermistor RT increases, so that the voltage across the positive temperature coefficient thermistor RT is higher than the voltage on R3, that is, the voltage of the non-inverting input terminal of the operational amplifier U1 higher than the inverting input terminal, the output terminal of the operational amplifier U1 outputs a high level at this time, and the high level lights up the indicator LED through the first current limiting resistor R4, and the indicator LED lights up to indicate that the temperature of the lamp is too high. At the same time, the output terminal of the operational amplifier U1 provides a high level for the gate of the MOS transistor Q1 through the second current-limiting resistor R5, so that the MOS transistor Q1 is turned on, the relay coil K is energized, the contact K-1 is closed, and the fan is energized Normal work, heat dissipation for lamps. If the temperature of the lamp returns to below the heat dissipation threshold, the fan stops working, and the indicator LED is also turned off, thereby saving energy.
在另一个实施例中，温度感应单元包括分压电阻和负温度系数（NTC）热敏电阻，负温度系数热敏电阻一端连接电源输入端、另一端连接运算放大器的同相输入端，分压电阻一端连接同相输入端、另一端接地。In another embodiment, the temperature sensing unit includes a voltage dividing resistor and a negative temperature coefficient (NTC) thermistor, one end of the NTC thermistor is connected to the power input terminal, and the other end is connected to the non-inverting input terminal of the operational amplifier, and the voltage dividing resistor Connect one end to the non-inverting input and the other end to ground.
请参见图2，由于分压电阻R1的电阻值较难确定，因此可以使用可变电阻，即阻值可以调节的电阻，通过多次调试以获得理想的阻值及风扇开始工作的（灯具）温度。Please refer to Figure 2. Since the resistance value of the voltage dividing resistor R1 is difficult to determine, a variable resistor can be used, that is, a resistor whose resistance value can be adjusted. After multiple adjustments, the ideal resistance value and the fan (lamp) that start working can be obtained. temperature.
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.
Claims (10)
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Application publication date: 20141224 |