WO2010045891A1 - 卤钨灯转接节能灯的电源转换器 - Google Patents

卤钨灯转接节能灯的电源转换器 Download PDF

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Publication number
WO2010045891A1
WO2010045891A1 PCT/CN2009/075477 CN2009075477W WO2010045891A1 WO 2010045891 A1 WO2010045891 A1 WO 2010045891A1 CN 2009075477 W CN2009075477 W CN 2009075477W WO 2010045891 A1 WO2010045891 A1 WO 2010045891A1
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WO
WIPO (PCT)
Prior art keywords
output
power converter
connector
current
power
Prior art date
Application number
PCT/CN2009/075477
Other languages
English (en)
French (fr)
Inventor
黄斌
Original Assignee
Wong Pun
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wong Pun filed Critical Wong Pun
Priority to CN2009901000266U priority Critical patent/CN201854465U/zh
Publication of WO2010045891A1 publication Critical patent/WO2010045891A1/zh
Priority to CN2010900005316U priority patent/CN201898450U/zh
Priority to PCT/CN2010/074184 priority patent/WO2011069360A1/zh
Priority to AU2010100911A priority patent/AU2010100911B4/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Definitions

  • the invention relates to a frequency conversion rectifying device, in particular to a power converter applied to a tungsten halogen lamp switching fluorescent lamp and an LED energy saving lamp.
  • the light source of the lamp has a tungsten halogen lamp, a fluorescent lamp and an LED lamp.
  • the LED lamp and the fluorescent lamp have the characteristics of being more energy-saving and longer in service life than the tungsten halogen lamp, and the LED lamp has lower heat generation value than other light sources, and the response time is shorter.
  • higher light efficiency and less environmental pollution it has attracted more and more researchers' attention.
  • LED lamps With the continuous development of the semiconductor industry, LED lamps will become more and more popular as light sources, especially in recent years. The replacement of tungsten halogen lamps as a light source for cold spotlights will become an inevitable trend.
  • the power supply for low-voltage directional illumination tungsten halogen lamps is a low-voltage high-frequency electronic transformer with high safety factor and low eye damage.
  • the output power supply voltage is 6V ⁇ 24V
  • the working frequency is 10K-40KHZ
  • the power is 4W ⁇ 300W.
  • the LED lamp works with a low voltage (6V ⁇ 24V) DC power supply, so the two of them cannot share the same power supply.
  • Fluorescent lamps mainly fluorescent lamps with electronic ballasts
  • Fluorescent lamps have the advantages of compact structure, small size, high luminous efficiency and long service life. They are widely used as energy-saving lamps as an energy-saving lamp for halogen lamps to LED lamps.
  • LED lamps do not have, such as low cost, soft light, etc., so it is still widely used as a light source for cold spotlights for a certain period of time.
  • Fluorescent lamps can be excited by an electronic inverter under low voltage (6V ⁇ 24V) DC power supply The lamp works normally, so the LED light and the fluorescent light can share a power supply.
  • the lighting fixtures commonly used in ordinary households are also tungsten halogen lamps. With the popularization of fluorescent energy-saving lamps and LED energy-saving lamps, many families need to replace halogen lamps with fluorescent or LED energy-saving lamps, while replacing energy-saving lamps.
  • the input part of the high-frequency electronic transformer is connected to the mains supply circuit, the voltage is 110V ⁇ 220V, but the output part is low voltage, so if it is not a professional electrician, replace the power supply.
  • the equipment is very unsafe. If the labor cost of replacing the power supply equipment is too high (especially in developed countries), it is necessary to adopt a method and equipment that can replace the lamps by yourself. Undoubtedly the most ideal is to use the existing low-voltage output power supply.
  • the existing halogen lamp power supply includes frequency conversion module and transformer module, and these function modules are commonly used in low-voltage power supply. Therefore, considering the original power supply and power supply interface, only one device can be added to achieve the purpose of replacing the lighting fixtures with ordinary people, which greatly saves the cost.
  • the object of the present invention is to solve the above technical problems, and to provide a power converter for a tungsten halogen lamp switching fluorescent lamp and an LED energy saving lamp.
  • a power converter of a tungsten halogen lamp switching energy-saving lamp comprising a conversion circuit and an input connector and an output connector respectively connected at two ends of the conversion circuit, wherein the input connection
  • the head is connected with a low-voltage high-frequency AC output power source, and the output connector is connected to the energy-saving lamp.
  • the low-voltage high-frequency AC power is converted from the input connector to the conversion circuit and then converted into a low-voltage DC power output to the energy-saving lamp through the output connector.
  • the conversion circuit includes a rectifying unit, and the low-voltage high-frequency alternating current is converted into a low-voltage direct current through a rectifying unit, and then output to an energy-saving lamp.
  • the rectifying unit includes:
  • a bridge rectifier circuit composed of four diodes, the two input ends of the bridge rectifier circuit being connected to the input terminal for converting the high frequency current into a pulsating direct current
  • the two poles of the filter capacitor are respectively connected to the two output ends of the bridge rectifier circuit for filtering the pulsating DC power into a smooth DC power.
  • the conversion circuit further includes a buck unit, the buck unit is connected to the rectifying unit, and the low-voltage direct current converted by the rectifying unit is stepped down by the buck unit and output to the energy-saving lamp.
  • the step-down unit filters the smoothing DC ripple of the filter capacitor into pulsed direct current.
  • the step-down unit includes an inductor, a diode and a switch tube.
  • the two ends of the switch tube are respectively connected to a negative pole of the filter capacitor and one end of the inductor, and the other end of the inductor is connected to a cathode of the output connector, and the anode of the output connector is The positive pole of the filter capacitor is connected, the anode of the diode is connected between the switch tube and the inductor, and the cathode of the diode is connected to the anode of the capacitor.
  • the buck unit further includes a PWM signal output circuit coupled to the switch tube for controlling a switching action of the switch tube.
  • the step-down unit further includes an output current sensing circuit, the output current sensing circuit includes a detecting resistor and a current sensor connected between a positive pole of the capacitor and a positive pole of the output connector, the current sensor Two ends are connected at both ends of the detecting resistor for acquiring a current flowing through the detecting resistor and comparing the current with a reference current; the current sensor is connected to the switch tube, The switching action of the switch tube is controlled by the comparison result.
  • the output current sensing circuit includes a detecting resistor and a current sensor connected between a positive pole of the capacitor and a positive pole of the output connector, the current sensor Two ends are connected at both ends of the detecting resistor for acquiring a current flowing through the detecting resistor and comparing the current with a reference current; the current sensor is connected to the switch tube, The switching action of the switch tube is controlled by the comparison result.
  • the current sensor and the switch tube are packaged in one chip.
  • the low-voltage high-frequency alternating current voltage is 6V ⁇ 24V, and the frequency is 10KHZ ⁇ 40KHZ.
  • the conversion circuit further includes a boosting unit connected between the input connector and the rectifying unit for converting the 6V ⁇ 12V AC power into 12V ⁇ 24V AC power.
  • the power converter further includes a housing, the input connector being fixedly mounted to the housing, the output connector being coupled to the switching circuit by a wire extending outside the housing.
  • the input connector is a MR16 GX5.3 standard interface
  • the output connector is connected to an energy-saving lamp connector having a standard interface of MR16 GX5.3.
  • FIG. 1 is a schematic structural view of an input joint portion according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural view of an output joint portion according to Embodiment 1 of the present invention
  • 3 is a circuit diagram of a conversion circuit according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic structural diagram of a power converter according to Embodiment 2 of the present invention.
  • FIG. 5 is a circuit diagram of a conversion circuit according to a third embodiment of the present invention.
  • FIG. 6 is a circuit diagram of a conversion circuit according to Embodiment 4 of the present invention.
  • FIG. 7 is a circuit diagram of a conversion circuit according to Embodiment 5 of the present invention.
  • FIG. 8 is a circuit diagram of a conversion circuit with a chip package according to Embodiment 5 of the present invention.
  • FIG. 9 is a circuit diagram of a conversion circuit according to Embodiment 6 of the present invention.
  • FIG. 10 is a circuit diagram of a conversion circuit according to Embodiment 7 of the present invention.
  • Figure 11 is a circuit diagram of a conversion circuit in accordance with an eighth embodiment of the present invention.
  • the invention provides a power converter for a tungsten halogen lamp energy-saving lamp.
  • a tungsten halogen lamp there are various functions and models of a tungsten halogen lamp, and a multi-plane cold reflection low-voltage directional lamp (referred to as a cold spot lamp) as a new type of energy-saving type.
  • the indoor illumination source has the characteristics of small size, small illuminator and high light utilization efficiency when equipped with corresponding mirrors. Moreover, it also uses a multi-planar dielectric film mirror. About 80% of the infrared rays are transmitted through the mirror without being projected.
  • the beam temperature is low, the illumination of the surface is uniform, and the orientation is good, which is beneficial to the preservation of the product, the vividness and highlight of the color, and the change of the bandwidth and wavelength of the reflected light of the dielectric film, which can be plated with red, yellow, green and blue. Equal color directional lighting effects, so its application is very extensive.
  • the interface pattern of the halogen tungsten cold spot lamp and the power supply source is also various.
  • the GX 5.3 of the international standard is more commonly used, and the model number thereof is also various.
  • the MR16 is more commonly used, and the interface of the invention is GX5.3.
  • the MR16 cold spotlight is taken as an example to introduce the technical solution adopted by the present invention, but it cannot be understood that the scope of protection of the present invention is limited to such an interface, such a model, a lamp of such function.
  • the power converter of the present invention comprises a conversion circuit 3 and an input connector 1 and an output connector 2 connected at both ends of the conversion circuit 3, the input connector and the output connector being fixedly mounted on a housing, the conversion The circuit is arranged inside the casing.
  • the input connector 1 is an international standard MR16 GX5.3 lamp connector, including two GX5.3 pin pins 11, which are connected to the conversion circuit of the power converter, and input the low-voltage high-frequency AC to be converted. When the current is assembled, the two pins 11 are connected to the original GX5.3 power supply connector, and the power supply connector is matched with the two pins 11 of the input connector 1.
  • the connector shape of the power supply is also shown in FIG.
  • the GX5.3 power supply connector includes a high frequency electronic transformer having an output current of 12V and an AC current having a frequency of 10KHZ, and the output connector 2 includes a jack 21 corresponding to the GX5.3 pin. After the conversion circuit converts the input low-voltage high-frequency current, it outputs from the output jack 21, and outputs a DC current of 12V.
  • the conversion circuit includes a rectifying unit, and the rectifying unit includes:
  • a bridge rectifier circuit composed of four diodes D1, D2, D3 and D4, the two input ends of the bridge rectifier circuit are connected with the input connector, and are used for converting 12V/10KHZ AC current input to the input terminal into 12V
  • the waveform is a pulsating direct current
  • the filter capacitor C1 is connected to two output ends of the bridge rectifier circuit for filtering the pulsating DC power into a smoother DC power.
  • the output connector 2 is passed through a wire extending outside the casing and the conversion circuit, and the length of the wire outside the casing is 5 cm to 15 cm. The purpose of this is to make the direction of the energy-saving lamp of the transfer adjustable.
  • a heat dissipation hole is further disposed on the outer casing to facilitate heat dissipation.
  • the power converter can also input an AC of 24V/40KHZ, and after being processed by the rectifying unit, it is converted into 24V DC power.
  • the conversion circuit of the power converter further includes a buck unit, the buck unit is connected to the rectifying unit, and the low-voltage direct current converted by the rectifying unit is stepped down by the buck unit and output to the energy-saving lamp.
  • the principle of step-down of the step-down unit is that the smooth DC ripple of the filter capacitor is pulsed DC.
  • the buck unit includes an inductor L1, a diode D5, and a switch K1.
  • the two ends of the switch are respectively connected to a negative end of the filter capacitor and one end of the inductor, and the other end of the inductor is connected to the output connector.
  • a cathode a cathode of the output connector is connected to a positive electrode of the filter capacitor
  • a cathode of the diode is connected between the switch tube and an inductor
  • a cathode of the diode is connected to a cathode of the capacitor.
  • the 24V DC converted by the rectifying unit is processed by the step-down unit and converted into 12V DC.
  • the switch tube performs switching operation at a certain frequency, and the smooth DC current is chopped as a pulsed direct current.
  • the buck unit further includes a PWM signal output circuit connected to the switch tube for controlling the switching action of the switch tube.
  • the alternating current having an input voltage of 20V/40KHZ is processed by the rectifying unit and the step-down unit, and is converted into a direct current of 12V.
  • the buck unit further includes an output current sensing circuit, and the output current sensing circuit includes a detecting resistor R1.
  • the detecting resistor is connected between a positive pole of the capacitor and a positive pole of the output connector, and two ends of the current sensor are connected at two ends of the detecting resistor for acquiring a flow through
  • the current of the detection resistor is compared and compared with the reference current; the current sensor is connected to the switch tube for controlling the switching action of the switch tube by the comparison result.
  • the current sensor and the switch tube are packaged in a chip IC, as shown in FIG. 8, the package is SOT89-5, and the chip includes four pins, respectively VIN, CSN, SW. And GND, the VIN pin and the CSN pin are connected to both ends of the detecting resistor, the SW pin is connected to one end of the inductor, and the GND pin is connected to the positive pole of the capacitor.
  • the chip IC further includes a DIM pin, and the DIM pin is connected to the PWM signal output circuit for loading a PWM signal to control the switch tube.
  • the switch operates to control the magnitude of the output current.
  • the chip IC loads the PWM signal through the DIM pin to control the magnitude of the output current, or analyzes the resistance flowing through the detecting resistor by acquiring the voltage across the detecting resistor. To control the size of the output current.
  • the PWM signal can also be loaded by only one DIM pin to control the output current.
  • the circuit diagram is shown in Figure 10.
  • the conversion circuit further includes a boosting unit, and the boosting unit includes a transformer L2 connected between the input connector and the rectifying unit for converting the 6V ⁇ 12V alternating current into 12V ⁇ 24V AC.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Description

卤钨灯转接节能灯的电源转换器
【技术领域】
本发明涉及变频整流设备， 尤其涉及一种应用于卤钨灯转接荧光及 LED 节能灯的电源转换器。
【背景技术】
目前照明灯的光源有卤钨灯、 荧光灯和 LED灯， LED灯和荧光灯具有比 卤钨灯更节能， 使用寿命更长的特点， 而且 LED灯比其他光源的发热量更低， 响应时间更短， 光效更高， 对环境污染更小的特点， 受到越来越多研究者的重 视， 随着半导体工业的不断发展， LED灯作为光源将会越来越普及， 近几年发 展尤其迅速， 其替代卤钨灯作为冷射灯的光源将成为必然趋势。 目前对低压定向照明卤钨灯的供电电源采用的是一种安全系数高， 对眼睛 伤害小的低压高频电子变压器， 其输出电源的电压为 6V~24V， 工作频率为 10K-40KHZ, 功率为 4W~300W。 而 LED灯工作时采用低压 （6V~24V) 直流 电源， 所以它们两个并不能共用同一个供电电源。 荧光灯 （主要指采用电子镇流器的荧光灯） 具有结构紧凑、 体积小、 发光 率高、使用寿命长等优点， 目前作为节能灯被广泛采用，作为一种卤钨灯向 LED 灯过度的节能灯， 其具有 LED灯不具备的优点， 例如成本低， 光线柔和等， 所 以在一定的时期内还依然被普遍采用作为冷射灯的光源。 荧光灯的在低压 （6V~24V) 直流供电状态下可通过电子逆变器激发荧光 灯正常工作， 所以 LED灯和荧光灯可共用一个供电电源。 目前普通家庭普遍采用的照明灯具还是卤钨灯， 而随着荧光节能灯以及 LED节能灯的推广普及， 很多家庭都需要将卤钨灯更换成荧光或 LED节能灯， 而更换节能灯的同时又要更换光源的供电电源部分， 即高频电子变压器， 该高 频电子变压器输入部分与市电供电电路相连， 电压是 110V~220V， 只是输出部 分是低压， 所以如果不是专业的电工， 在更换电源设备时很不安全， 如果请专 业人员更换电源设备的人工成本又过于高昂 （尤其在欧美发达国家）， 所以需要 采用一种能够自己动手更换灯具的方法和设备。 无疑最理想的还是沿用现有的 低压输出的供电电源。 另外， 如果完全拆除掉原来的卤钨冷射灯供电电源部分， 换成另外一种供 电电源， 则废弃掉的供电电源对环境也将会造成很大的污染， 不仅造成浪费， 同时也增加了更换的成本， 因为现有的卤素灯供电电源包括变频模块和变压模 块， 而这些功能模块都是低压供电电源普遍用到的模块。 所以考虑基于原来的 供电电源和供电接口， 只需要增加一种装置就可以实现普通人也能更换照明灯 具的目的， 极大的节约了成本。
【发明内容】
本发明的目的就是为了解决上述的技术问题， 特提供一种卤钨灯转接荧光 及 LED节能灯的电源转换器。
本发明所采用的具体技术方案如下：
一种卤钨灯转接节能灯的电源转换器， 所述的电源转换器包括转换电路以 及分别连接在转换电路两端的输入接头和输出接头， 其特征在于， 所述输入接 头与低压高频交流电输出电源连接， 所述输出接头连接节能灯， 低压高频交流 电从输入接头流经转换电路后转换成低压直流电经输出接头输出给节能灯。
所述转换电路包括整流单元， 所述低压高频交流电经整流单元后转换成低 压直流电后输出给节能灯。
所述整流单元包括：
四个二极管构成的桥式整流电路， 该桥式整流电路的两个输入端与所述输 入接头连接， 用于将所述高频电流转换成脉动的直流电，
滤波电容， 该滤波电容的两极分别连接所述桥式整流电路的两个输出端， 用于将所述脉动的直流电滤波成平稳的直流电。
所述转换电路还包括降压单元， 所述降压单元连接所述整流单元， 所述经 整流单元转换后的低压直流电经所述降压单元降压后输出给节能灯。
所述降压单元将所述滤波电容滤波成的平稳的直流电斩波为脉冲直流电。 所述降压单元包括电感、 二极管和开关管， 所述开关管的两端分别连接滤 波电容的负极和电感的一端， 所述电感的另一端连接输出接头的负极， 所述输 出接头的正极与所述滤波电容的正极连接， 所述二极管的正极连接在所述开关 管和电感之间， 该二极管的负极连接所述电容的正极。
所述降压单元还包括 PWM信号输出电路，与所述开关管连接，用于控制所 述开关管的开关动作。
所述降压单元还包括输出电流传感电路， 该输出电流传感电路包括一检测 电阻和电流传感器， 该检测电阻连接在所述电容的正极和输出接头的正极之间， 所述电流传感器的两端连接在所述检测电阻的两端， 用于获取流经所述检测电 阻的电流并将该电流与基准电流比较； 所述电流传感器与所述开关管连接， 用 于通过比较结果控制所述开关管的开关动作。
所述电流传感器和开关管封装在一个芯片内。
所述的低压高频的交流电的电压为 6V~24V， 频率为 10KHZ~40KHZ。 所述转换电路还包括升压单元， 所述升压单元连接在所述输入接头和整流 单元之间， 用于将所述 6V~12V的交流电转换成 12V~24V的交流电。
该电源转换器还包括外壳， 所述输入接头固定安装在外壳上， 所述输出接 头通过延伸至外壳外的导线与所述转换电路连接。
所述的输入接头为 MR16 GX5.3标准接口， 所述输出接头连接具有 MR16 GX5.3标准接口的节能灯接头。
本发明有益的技术效果在于：
1 . 在原有的供电电源和供电接口的基础之上， 只需要增加本发明所述 的电源转换器，就可以实现从对卤钨灯到对荧光节能灯或 LED节能 灯供电的电源设备， 无需用户丢掉以前的电源转换装置 （从市电转 变为低压高频的电源转换装置），为用户节省了成本， 同时也减少了 环境污染。
2. 在更换本发明的电源转换器时， 是基于人体的安全低电压， 所以在 更换电源适配器和更换光源时， 无需专业的电工， 普通的人即可更 换， 这样可以大大的节省了人工成本。
【附图说明】
图 1为本发明实施例一的输入接头部分的结构示意图；
图 2为本发明实施例一的输出接头部分的结构示意图； 图 3为本发明实施例一的转换电路的电路图；
图 4为本发明实施例二电源转换器的结构示意图；
图 5为本发明实施例三的转换电路的电路图；
图 6为本发明实施例四的转换电路的电路图；
图 7为本发明实施例五的转换电路的电路图；
图 8为本发明实施例五的转换电路带芯片封装的电路图；
图 9为本发明实施例六的转换电路的电路图；
图 10为本发明实施例七的转换电路的电路图；
图 11为本发明实施例八的转换电路的电路图。
【具体实施方式】
本发明提供一种卤钨灯转接节能灯的电源转换器， 目前卤钨灯的功能和型 号有多种， 多平面冷反射低压定向照明灯 （简称冷射灯） 作为一种新型的节能 型室内照明光源具有体积小、发光体小,配上相应的反光镜时光利用率高的特点， 不仅如此它还采用多平面介质膜反光镜， 约 80%的红外线透过反光镜而不被投 射到被照物上， 故光束温度低， 被照面照度均匀， 定向性好， 有利于商品保鲜、 显色逼真和突出， 改变介质膜反射光的带宽和波长， 可以镀出红、 黄、 绿、 蓝 等彩色的定向照明效果， 所以其应用非常广泛。
而卤钨冷射灯的与供电电源的接口样式也有多种， 较普遍的采用国际标准 的 GX 5.3，其型号也有多种，较普遍的采用的是 MR16,本发明以接口为 GX5.3 的 MR16冷射灯为例来介绍本发明所采用的技术方案， 但是并不能就此理解为 本发明的保护范围局限于此种接口， 此种型号， 此种功能的灯具。 实施例一
如图 1 所示， 本发明的电源转换器包括转换电路 3以及连接在转换电路 3 两端的输入接头 1和输出接头 2，所述输入接头和输出接头均固定安装在一个外 壳上，所述转换电路设置在外壳内部，该输入接头 1为国际标准的 MR16 GX5.3 灯具接头， 包括两 GX5.3脚针 11， 该脚针 11连接电源转换器的转换电路， 输 入待转换的低压高频 AC电流， 装配时， 这两个脚针 11连接原来的 GX5.3供电 电源接头， 所述供电电源接头与该输入接头 1 的两针脚 11相配合， 该供电电源 的接头形状也如图 2所示， 该 GX5.3供电电源接头包括高频电子变压器， 该高 频电子变压器输出电压为 12V、 频率为 10KHZ的 AC电流， 所述的输出接头 2 包括与 GX5.3脚针相对应的插孔 21，转换电路对输入的低压高频电流进行转换 之后， 从所述的输出插孔 21 中输出， 输出为 12V的 DC电流。
如图 3所示， 所述的转换电路包括整流单元， 该整流单元包括：
由四个二极管 D1、 D2、 D3和 D4构成的桥式整流电路， 该桥式整流电路 两个输入端与所述输入接头连接， 用于将输入端输入的 12V/10KHZ的 AC电流 转换成 12V波形为脉动的直流电；
滤波电容 C1 , 所述滤波电容 C1 的两极分别连接所述桥式整流电路的两个 输出端连接， 用于将所述脉动的直流电滤波成波形更平稳的直流电。
实施例二
在实施例一的基础之上， 如图 4所示， 将所述输出接头 2通过一延伸至外 壳之外的导线与所述转换电路， 在外壳之外的导线长度为 5cm~15cm。 这样做 的的目的是为了使转接的节能灯照明方向可调节。 所述外壳之上还设置有散热 孔方便散热。 实施例三
在实施例一的基础之上， 该电源转换器还可以输入 24V/40KHZ的 AC, 经 所述整流单元处理后， 转换成 24V直流电。
该电源转换器的转换电路还包括降压单元， 所述降压单元与所述整流单元 连接， 所述经整流单元转换后的低压直流电经所述降压单元降压后输出给节能 灯， 所述降压单元降压的原理为将所述滤波电容滤波成的平稳的直流电斩波为 脉冲直流电。
如图 5所示， 所述降压单元包括电感 L1、 二极管 D5和开关管 K1， 所述开 关管的两端分别连接滤波电容的负极和电感的一端， 所述电感的另一端连接输 出接头的负极， 所述输出接头的正极与所述滤波电容的正极连接， 所述二极管 的正极连接在所述开关管和电感之间， 该二极管的负极连接所述电容的正极。
所述经整流单元转换成的 24V直流电经所述降压单元处理后， 转变成 12V 直流电。
所述开关管按一定的频率做开关工作可将所述平稳的直流电斩波为脉冲直 流电， 所述开关管的开关频率越高， 则斩断直流电越少， 则电压的有效值降的 越少， 反之， 开关管的开关频率越低， 则斩断的直流电越多， 则电压的有效值 下降的越多。
实施例四
在上述实施例三中， 如果开关管的开关频率固定， 则降压单元完成的压降 也固定， 而对于输出接头连接节能灯的额定电压固定的情况下， 如果输入电压 不同， 则不能满足输出电压恒定的要求， 所以需要合理调节开关管的开关频率， 如此才能适用不同的电压环境， 连接不同的供电电源接头。 在上述实施例三的基础之上， 如图 6所示， 所述降压单元还包括 PWM信 号输出电路， 与所述开关管连接， 用于控制所述开关管的开关动作。
在本实施例中， 输入电压为 20V/40KHZ的交流电经整流单元和降压单元处 理后， 被转换成 12V的直流电。
实施例五
或者， 与实施例四不同的是， 在上述实施例三的基础之上， 如图 7所示， 所述降压单元还包括输出电流传感电路， 该输出电流传感电路包括一检测电阻 R1 和电流传感器 CS1 (Current Sensor), 该检测电阻连接在所述电容的正极 和输出接头的正极之间， 所述电流传感器的两端连接在所述检测电阻的两端， 用于获取流经所述检测电阻的电流并将该电流与基准电流比较； 所述电流传感 器与所述开关管连接， 用于通过比较结果控制所述开关管的开关动作。
在本实施例中， 所述电流传感器和所述开关管封装在一个芯片 IC内， 如图 8所示， 其封装方式为 SOT89-5, 该芯片包括四个针脚， 分别为 VIN、 CSN, SW和 GND,所述 VIN针脚和 CSN针脚连接在所述检测电阻的两端，所述 SW 针脚连接电感的一端， 所述 GND针脚连接电容的正极。
实施例六
在上述实施例五的基础之上， 如图 9所示，所述芯片 IC还包括一个 DIM针 脚， 该 DIM针脚与所述 PWM信号输出电路连接， 用于加载 PWM信号， 控制 所述开关管的开关动作， 从而控制输出电流的大小。
实施例七
在上述实施例六中， 所述芯片 IC通过 DIM针脚加载 PWM信号， 来控制输 出电流的大小， 或者通过获取检测电阻两端的电压来分析流经检测电阻的电阻， 来控制输出电流的大小。
当然， 也可只通过一个 DIM针脚加载 PWM信号来控制输出电流的大小， 其电路图如图 10所示。
实施例八
当所述输入电压低于 12V时， 为了保证输出电压为 12V, 则需要将输入的 低压高频交流电升压后才能整流和降压处理， 所以， 在上述实施例五的基础之 上， 如图 11所示， 所述转换电路还包括升压单元， 所述升压单元包括一变压器 L2, 连接在所述输入接头和整流单元之间， 用于将所述 6V~12V的交流电转换 成 12V~24V的交流电。
需要说明的是普通的技术人员针对上述的实施例还可以很容易的想到其他 的技术方案， 这些技术方案应属于本专利的保护范围。

Claims

权 利 要 求 书
1 . 一种卤钨灯转接节能灯的电源转换器， 所述的电源转换器包括转换电路 以及分别连接在转换电路两端的输入接头和输出接头， 其特征在于， 所述输入 接头与低压高频交流电输出电源连接， 所述输出接头连接节能灯， 低压高频交 流电从输入接头流经转换电路后转换成低压直流电经输出接头输出给节能灯。
2. 根据权利要求 1所述的电源转换器， 其特征在于， 所述转换电路包括整 流单元， 所述低压高频交流电经整流单元后转换成低压直流电后输出给节能灯。
3. 根据权利要求 2所述的电源转换器， 其特征在于， 所述整流单元包括： 四个二极管构成的桥式整流电路， 该桥式整流电路的两个输入端与所述输 入接头连接， 用于将所述高频电流转换成脉动的直流电，
滤波电容， 该滤波电容的两极分别连接所述桥式整流电路的两个输出端， 用于将所述脉动的直流电滤波成平稳的直流电。
4. 根据权利要求 3所述的电源转换器， 其特征在于， 所述转换电路还包括 降压单元， 所述降压单元连接所述整流单元， 所述经整流单元转换后的低压直 流电经所述降压单元降压后输出给节能灯。
5. 根据权利要求 4所述的电源转换器， 其特征在于， 所述降压单元将所述 滤波电容滤波成的平稳的直流电斩波为脉冲直流电。
6. 根据权利要求 4或 5所述的电源转换器， 其特征在于， 所述降压单元包 括电感、 二极管和开关管， 所述开关管的两端分别连接滤波电容的负极和电感 的一端， 所述电感的另一端连接输出接头的负极， 所述输出接头的正极与所述 滤波电容的正极连接， 所述二极管的正极连接在所述开关管和电感之间， 该二 极管的负极连接所述电容的正极。
7. 根据权利要求 6所述的电源转换器， 其特征在于， 所述降压单元还包括 PWM信号输出电路， 与所述开关管连接， 用于控制所述开关管的开关动作。
8. 根据权利要求 6或 7所述的电源转换器， 其特征在于， 所述降压单元还 包括输出电流传感电路， 该输出电流传感电路包括一检测电阻和电流传感器， 该检测电阻连接在所述电容的正极和输出接头的正极之间， 所述电流传感器的 两端连接在所述检测电阻的两端， 用于获取流经所述检测电阻的电流并将该电 流与基准电流比较； 所述电流传感器与所述开关管连接， 用于通过比较结果控 制所述开关管的开关动作。
9. 根据权利要求 8所述的电源传感器， 其特征在于， 所述电流传感器和开 关管封装在一个芯片内。
10. 根据权利要求 1 所述的电源转换器， 其特征在于， 所述的低压高频的 交流电的电压为 6V~24V， 频率为 10KHZ~40KHZ。
11 . 根据权利要求 10所述的电源转换器， 其特征在于， 所述转换电路还包 括升压单元， 所述升压单元连接在所述输入接头和整流单元之间， 用于将所述
6V-12V的交流电转换成 12V~24V的交流电。
12. 根据权利要求 1 所述的电源转换器， 其特征在于， 该电源转换器还包 括外壳， 所述输入接头固定安装在外壳上， 所述输出接头通过延伸至外壳外的 导线与所述转换电路连接。
13. 根据权利要求 1或 12所述的电源转换器， 其特征在于， 所述的输入接 头为 MR16 GX5.3标准接口， 所述输出接头连接具有 MR16 GX5.3标准接口的 节能灯接头。
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