WO2019024877A1 - 一种信号转换电路、调光led驱动电源及灯具 - Google Patents

一种信号转换电路、调光led驱动电源及灯具 Download PDF

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WO2019024877A1
WO2019024877A1 PCT/CN2018/098098 CN2018098098W WO2019024877A1 WO 2019024877 A1 WO2019024877 A1 WO 2019024877A1 CN 2018098098 W CN2018098098 W CN 2018098098W WO 2019024877 A1 WO2019024877 A1 WO 2019024877A1
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Prior art keywords
transistor
circuit
resistor
pwm
pull
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English (en)
French (fr)
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杨文�
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Opple Lighting Co Ltd
Suzhou Op Lighting Co Ltd
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Opple Lighting Co Ltd
Suzhou Op Lighting Co Ltd
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Priority claimed from CN201710661035.3A external-priority patent/CN107426871B/zh
Priority claimed from CN201720969119.9U external-priority patent/CN207135326U/zh
Application filed by Opple Lighting Co Ltd, Suzhou Op Lighting Co Ltd filed Critical Opple Lighting Co Ltd
Publication of WO2019024877A1 publication Critical patent/WO2019024877A1/zh
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/39—Circuits containing inverter bridges

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  • the invention relates to the field of illumination, in particular to a signal conversion circuit, a dimming LED driving power source and a lamp.
  • the LED dimming driving power supply it is necessary to convert the external PWM (Pulse Width Modulation) signal into the reference voltage signal of the secondary side sampling chip through a signal conversion circuit to realize the circuit change.
  • the function of the sampling reference adjusts the output current of the power supply to achieve the dimming effect.
  • the invention provides a signal conversion circuit, a dimming LED driving power source and a lamp to overcome the above-mentioned problem of high circuit cost in the prior art.
  • the present invention proposes a signal conversion circuit for adjusting a reference voltage by a PWM signal, including:
  • a PWM acquisition circuit connected to the PWM output port for acquiring a PWM signal
  • a push-pull circuit connected to the reference source and the PWM acquisition circuit for implementing line conversion according to the PWM signal
  • a charge and discharge circuit connected to the push-pull circuit for charging or discharging according to conversion of a push-pull line
  • the PWM output port outputs a square wave with an adjustable duty ratio, and when the square wave is in a high level segment, the charging and discharging circuit is charged; when the square wave is in a low level segment, the charging and discharging The circuit is discharged.
  • the PWM acquisition circuit includes a first transistor.
  • the first transistor is an NMOS transistor, a gate of the first transistor is connected to the PWM output port, a drain of the first transistor is connected to the reference source, and a source of the first transistor is grounded .
  • the PWM acquisition circuit further includes a pull-up resistor connected in parallel between the gate of the first transistor and the reference source,
  • the signal conversion circuit outputs at full load when the PWM output port has no PWM signal through the pull-up resistor.
  • the push-pull circuit includes a second transistor and a third transistor connected in series.
  • the second transistor and the third transistor are both NMOS transistors, the gate of the second transistor is connected to the drain of the first transistor, and the source of the second transistor is grounded, the A drain of the second transistor is connected to a source of the third transistor, a gate of the third transistor is connected to a gate of the first transistor, and a drain of the third transistor is connected to a reference voltage.
  • the charge and discharge circuit includes a first resistor, a second resistor, a third resistor, and a capacitor.
  • the first resistor is connected between the drain of the third transistor and the reference voltage, and the second resistor is connected at one end to a source connection point of the drain of the second transistor and the third transistor The other end of the second resistor is connected to the capacitor, the other end of the capacitor is grounded, and the third resistor is connected in parallel with the capacitor;
  • the first transistor When the square wave is in a high level segment, the first transistor is turned on, the second transistor is turned off, the third transistor is turned on, and the reference voltage is passed through the first resistor and the second resistor Charging the capacitor;
  • the first transistor When the square wave is in a low level segment, the first transistor is turned off, the second transistor is turned on, the third transistor is turned off, and the capacitor is discharged through the second resistor and the third resistor.
  • the invention also provides a dimming LED driving power source, comprising the signal conversion circuit and a PWF dimming circuit, the PWF dimming circuit having the PWM output port.
  • the invention also provides a light fixture comprising the dimming LED driving power source
  • a light source device as a load is connected to the dimming LED driving power source.
  • the signal conversion circuit, the dimming LED driving power source and the lamp of the invention acquire the PWM signal through the PWM acquisition circuit, realize the line conversion according to the PWM signal through the push-pull circuit, realize charging or discharging through the charging and discharging circuit, and further pass the PWM Signal adjustment reference voltage. Since the circuit structure of the present invention does not employ a sampling operational amplifier with complicated schemes, the circuit of the present invention is simple and can effectively reduce the circuit cost.
  • FIG. 1 is a schematic structural block diagram of a signal conversion circuit according to an embodiment of the present invention.
  • FIG. 2 is a schematic circuit diagram of a signal conversion circuit in accordance with one embodiment of the present invention.
  • FIG. 3 is a schematic structural block diagram of a dimming LED driving power supply according to an embodiment of the present invention.
  • FIG. 4 is a schematic block diagram of a luminaire in accordance with one embodiment of the present invention.
  • a signal conversion circuit 100 is used to adjust a reference voltage by a PWM signal, and may generally include a reference source VCC, a PWM acquisition circuit 10, a push-pull circuit 20, and a charge and discharge circuit 30.
  • the reference source VCC is used to supply the supply voltage.
  • the PWM acquisition circuit 10 is connected to the PWM output port for acquiring the PWM signal.
  • the push-pull circuit 20 is connected to the reference source VCC and the PWM acquisition circuit 10 for implementing line conversion according to the PWM signal.
  • a charge and discharge circuit 30 is connected to the push-pull circuit 20 for charging or discharging according to the conversion of the push-pull line.
  • the PWM output port outputs a square wave with an adjustable duty ratio, and when the square wave is in a high level segment, the charging and discharging circuit 30 is charged; when the square wave is in a low level segment, the charging The discharge circuit 30 is discharged.
  • the signal conversion circuit 100 of the present invention acquires a PWM signal through the PWM acquisition circuit 10, realizes line conversion according to the PWM signal through the push-pull circuit 20, performs charging or discharging through the charging and discharging circuit 30, and further adjusts the reference voltage through the PWM signal. . Since the circuit structure of the present invention does not employ a sampling operational amplifier with complicated schemes, the circuit of the present invention is simple and can effectively reduce the circuit cost.
  • the PWM acquisition circuit 10 includes a first transistor Q3.
  • the first transistor Q3 is an NMOS transistor, the gate of the first transistor Q3 is connected to the PWM output port, and the drain of the first transistor Q3 is connected to the reference source VCC, the first transistor The source of Q3 is grounded.
  • the PWM signal is inverted by the first transistor Q3 to ensure that the push-pull output of the push-pull circuit is in phase with the PWM signal.
  • an eighth resistor R8 is connected between the gate of the first transistor Q3 and the PWM output port, and the eighth resistor R8 is a current limiting resistor.
  • a second diode D2 is connected in parallel between the PWM output port and the source of the first transistor Q3, and the second diode D2 is a clamp diode.
  • a fifth resistor R5 is connected between the drain of the first transistor Q3 and the reference source VCC, and the fifth resistor R5 is a current limiting resistor.
  • a tenth resistor R10 is connected in parallel between the gate of the first transistor Q3 and the source of the first transistor Q3, and the tenth resistor R10 is a discharge resistance between the gate and the source of the first transistor Q3.
  • the PWM acquisition circuit 10 further includes a pull-up resistor R4 for current limiting, the pull-up resistor R4 being connected in parallel between the gate of the first transistor Q3 and the reference source VCC, The pull-up resistor R4 causes the signal conversion circuit 100 to output at full load when the PWM output port has no PWM signal.
  • a first diode D1 is connected between the pull-up resistor R4 and the gate of the first transistor Q3, and the first diode D1 is a reverse-biased diode.
  • the push-pull circuit 20 includes a second transistor Q2 and a third transistor Q1 connected in series.
  • the second transistor Q2 and the third transistor Q1 are both NMOS transistors, the gate of the second transistor Q2 is connected to the drain of the first transistor Q3, and the source of the second transistor Q2 Grounding, the drain of the second transistor Q2 is connected to the source of the third transistor Q1, the gate of the third transistor Q1 is connected to the gate of the first transistor Q3, and the third transistor Q1 is The drain is connected to the reference voltage Vref.
  • a sixth resistor R6 is connected between the gate of the second transistor Q2 and the drain of the first transistor Q3, and the sixth resistor R6 is a current limiting resistor.
  • a ninth resistor R9 is connected in parallel between the gate of the second transistor Q2 and the source of the second transistor Q2, and the ninth resistor R9 is a discharge resistance between the gate and the source of the second transistor Q3.
  • the charge and discharge circuit 30 includes a first resistor R1, a second resistor R2, a third resistor R7, and a capacitor C1.
  • the first resistor R1 is connected to the drain of the third transistor Q1 and the reference voltage. Between Vref, one end of the second resistor R2 is connected to a source connection point of the drain of the second transistor Q2 and the third transistor Q1, and the other end of the second resistor R2 is connected to the capacitor C1. The other end of the capacitor C1 is grounded, and the third resistor R7 is connected in parallel with the capacitor C1.
  • the first resistor R1, the second resistor R2 and the capacitor C1 form an RC filter circuit.
  • the RC filter is used to provide a stable reference voltage to the reference and filter out the interference signal.
  • the PWM output port output PWM signal is inverted by the first transistor Q3, so that the PWM signal is in phase with the push-pull output of the push-pull circuit, and the push-pull line composed of the third transistor Q1 and the second transistor Q2 can achieve 0-100% Dimming control.
  • the dimming signal outputted by the PWM output port is a square wave whose duty ratio D is adjustable, and the square wave signal directly controls the gate of the first transistor Q3.
  • the first transistor Q3 When in the high-level range of the square wave, the first transistor Q3 is turned on, the VDS voltage of the first transistor Q3 becomes low, the VGS of the second transistor Q2 goes low, the second transistor Q2 turns off, and the third transistor Q1 is turned on.
  • the reference voltage Vref charges the capacitor C1 after passing through the first resistor R1 and the second resistor R2.
  • the first transistor Q3 is turned off, the VGS of the second transistor Q2 goes high, the second transistor Q2 is turned on, and the third transistor Q1 is turned off, and the capacitor C1 passes through the second resistor R2 and the third resistor. R7 discharge.
  • the duty ratio D of the PWM input terminal is an adjustable square wave signal.
  • FIG. 3 is a schematic block diagram of a dimming LED driving power supply in accordance with one embodiment of the present invention.
  • the present invention also provides a dimming LED driving power supply 1, which may generally include the signal conversion circuit 100 and the PWF dimming circuit 200 described in the above embodiments, and the PWF dimming circuit 200 has the PWM output port.
  • the dimming LED driving power supply of the present invention includes all the technical features of the signal conversion circuit, so that it acquires a PWM signal through a PWM acquisition circuit, realizes line conversion according to the PWM signal through a push-pull circuit, and realizes charging through a charging and discharging circuit. Or discharge, and then adjust the reference voltage through the PWM signal. Since the circuit structure of the present invention does not employ a sampling operational amplifier with complicated schemes, the circuit of the present invention is simple and can effectively reduce the circuit cost. In addition, the dimming LED driving power supply of the invention has the advantages of high signal conversion accuracy.
  • FIG. 4 is a schematic block diagram of a luminaire in accordance with one embodiment of the present invention.
  • the present invention also provides a luminaire I, which may generally include the dimming LED driving power source 1 in the above embodiment, and a light source device 2 as a load, the loaded light source device 2 being connected to the dimming LED Drive power supply 1.
  • the lamp of the invention comprises all the technical features of the signal conversion circuit, so that the PWM signal is obtained by the PWM acquisition circuit, the line conversion is realized according to the PWM signal by the push-pull circuit, the charging or discharging is realized by the charging and discharging circuit, and then the The PWM signal adjusts the reference voltage to achieve dimming of the luminaire. Since the circuit structure of the present invention does not employ a sampling operational amplifier with complicated schemes, the circuit of the present invention is simple and can effectively reduce the circuit cost.
  • modules in the devices of the embodiments can be adaptively changed and placed in one or more devices different from the embodiment.
  • the modules or units or components of the embodiments may be combined into one module or unit or component, and further they may be divided into a plurality of sub-modules or sub-units or sub-components.
  • any combination of the features disclosed in the specification, including the accompanying claims, the abstract and the drawings, and any methods so disclosed, or All processes or units of the device are combined.
  • Each feature disclosed in this specification (including the accompanying claims, the abstract and the drawings) may be replaced by alternative features that provide the same, equivalent or similar purpose.
  • the various component embodiments of the present invention may be implemented in hardware, or in a software module running on one or more processors, or in a combination thereof.
  • a microprocessor or digital signal processor may be used in practice to implement some or all of the functionality of some or all of the components of a luminaire in accordance with embodiments of the present invention.
  • the invention can also be implemented as a device or device program (e.g., a computer program and a computer program product) for performing some or all of the methods described herein.
  • a program implementing the invention may be stored on a computer readable medium or may be in the form of one or more signals. Such signals may be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

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Abstract

本发明提供了一种信号转换电路、调光LED驱动电源及灯具，涉及照明领域。信号转换电路包括基准源、PWM获取电路、推挽电路及充放电电路，基准源用于提供供电电压；PWM获取电路连接PWM输出端口，用于获取PWM信号；推挽电路与所述基准源及所述PWM获取电路相连，用于根据所述PWM信号实现线路转换；充放电电路，与所述推挽电路相连，用于根据推挽线路的转换实现充电或放电，进而通过PWM信号调节基准电压。由于本发明的电路结构没有采用方案复杂的采样运算放大器，因此本发明线路简单，可有效降低电路成本。

Description

一种信号转换电路、调光LED驱动电源及灯具 技术领域
本发明涉及照明领域，特别是涉及一种信号转换电路、调光LED驱动电源及灯具。
背景技术
在LED调光驱动电源的使用中，需要通过一个信号转换电路将外部的PWM(英文全称：Pulse Width Modulation，中文译文：脉冲宽度调制)信号转换为副边采样芯片的基准电压信号，实现改变电路采样基准的功能从而调节电源的输出电流，实现调光的效果。
现有的信号转换电路是通过采样运算放大器实现的。由于采样运算放大器方案复杂，导致电路成本较高。
发明内容
本发明提供了一种信号转换电路、调光LED驱动电源及灯具，以克服上述现有技术中存在的电路成本高的问题。
特别地，本发明提出了一种信号转换电路，用于通过PWM信号调节基准电压，包括：
基准源，用于提供供电电压；
PWM获取电路，连接PWM输出端口，用于获取PWM信号；
推挽电路，与所述基准源及所述PWM获取电路相连，用于根据所述PWM信号实现线路转换；和
充放电电路，与所述推挽电路相连，用于根据推挽线路的转换实现充电或放电；
其中，所述PWM输出端口输出占空比可调的方波，所述方波处于高电平段时，所述充放电电路充电；所述方波处于低电平段时，所述充放电电路放电。
进一步地，所述PWM获取电路包括第一晶体管。
进一步地，所述第一晶体管为NMOS管，所述第一晶体管的栅极连接所述PWM输出端口，所述第一晶体管的漏极接所述基准源，所述 第一晶体管的源极接地。
进一步地，所述PWM获取电路还包括上拉电阻，所述上拉电阻并联在所述第一晶体管的栅极与所述基准源之间，
通过所述上拉电阻使得当所述PWM输出端口无PWM信号时，所述信号转换电路以满载输出。
进一步地，所述推挽电路包括串联的第二晶体管和第三晶体管。
进一步地，所述第二晶体管和所述第三晶体管均为NMOS管，所述第二晶体管的栅极接所述第一晶体管的漏极，所述第二晶体管的源极接地，所述第二晶体管的漏极与所述第三晶体管的源极连接，所述第三晶体管的栅极接所述第一晶体管的栅极，所述第三晶体管的漏极接参考电压。
进一步地，所述充放电电路包括第一电阻、第二电阻、第三电阻及电容，
所述第一电阻连接在所述第三晶体管的漏极与所述参考电压之间，所述第二电阻一端连接在所述第二晶体管的漏极与所述第三晶体管的源极连接点，所述第二电阻另一端连接所述电容，所述电容的另一端接地，所述第三电阻与所述电容并联；
所述方波处于高电平段时，所述第一晶体管导通，所述第二晶体管关闭，所述第三晶体管导通，所述参考电压经所述第一电阻和所述第二电阻给所述电容充电；
所述方波处于低电平段时，所述第一晶体管关闭，所述第二晶体管导通，所述第三晶体管关闭，所述电容经过所述第二电阻和所述第三电阻放电。
本发明还提供了一种调光LED驱动电源，包括所述的信号转换电路及PWF调光电路，所述PWF调光电路具有所述PWM输出端口。
本发明还提供了一种灯具，包括所述的调光LED驱动电源；以及
作为负载的光源器件，连接至所述调光LED驱动电源。
本发明所述的信号转换电路、调光LED驱动电源及灯具，通过PWM获取电路获取PWM信号，通过推挽电路根据所述PWM信号实现线路转换，通过充放电电路实现充电或放电，进而通过PWM信号调节基准电压。由于本发明的电路结构没有采用方案复杂的采样运算放大器，因此本发明线路简单，可有效降低电路成本。
上述说明仅是本发明技术方案的概述，为了能够更清楚了解本发明的技术手段，而可依照说明书的内容予以实施，并且为了让本发明的上述和其它目的、特征和优点能够更明显易懂，以下特举本发明的具体实施方式。
根据下文结合附图对本发明具体实施例的详细描述，本领域技术人员将会更加明了本发明的上述以及其他目的、优点和特征。
附图说明
通过阅读下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本发明的限制。而且在整个附图中，用相同的参考符号表示相同的部件。在附图中：
图1是根据本发明一个实施例的信号转换电路的示意性结构框图；
图2是根据本发明一个实施例的信号转换电路的示意性电路图；
图3是根据本发明一个实施例的调光LED驱动电源的示意性结构框图；以及
图4是根据本发明一个实施例的灯具的示意性结构框图。
具体实施方式
下面将参照附图更详细地描述本公开的示例性实施例。虽然附图中显示了本公开的示例性实施例，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施例所限制。相反，提供这些实施例是为了能够更透彻地理解本公开，并且能够将本公开的范围完整的传达给本领域的技术人员。
图1是根据本发明一个实施例的信号转换电路的示意性结构框图。一种信号转换电路100用于通过PWM信号调节基准电压，一般性可以包括：基准源VCC、PWM获取电路10、推挽电路20及充放电电路30。基准源VCC用于提供供电电压。PWM获取电路10连接PWM输出端口，用于获取PWM信号。推挽电路20与所述基准源VCC及所述PWM获取电路10相连，用于根据所述PWM信号实现线路转换。充放电电路30与所述推挽电路20相连，用于根据推挽线路的转换实现充电或放电。其中，所述PWM输出端口输出占空比可调的方波，所述方波处 于高电平段时，所述充放电电路30充电；所述方波处于低电平段时，所述充放电电路30放电。
本发明所述的信号转换电路100，通过PWM获取电路10获取PWM信号，通过推挽电路20根据所述PWM信号实现线路转换，通过充放电电路30实现充电或放电，进而通过PWM信号调节基准电压。由于本发明的电路结构没有采用方案复杂的采样运算放大器，因此本发明线路简单，可有效降低电路成本。
图2是根据本发明一个实施例的信号转换电路的示意性电路图。本实施例中，所述PWM获取电路10包括第一晶体管Q3。
进一步地，所述第一晶体管Q3为NMOS管，所述第一晶体管Q3的栅极连接所述PWM输出端口，所述第一晶体管Q3的漏极接所述基准源VCC，所述第一晶体管Q3的源极接地。通过所述第一晶体管Q3使得PWM信号反向，以保证经推挽电路的推挽输出与PWM信号同相。
更进一步地，所述第一晶体管Q3的栅极与所述PWM输出端口之间连接第八电阻R8，第八电阻R8为限流电阻。更进一步地，所述PWM输出端口与所述第一晶体管Q3的源极之间并联第二二极管D2，第二二极管D2为钳位二极管。更进一步地，所述第一晶体管Q3的漏极与所述基准源VCC之间连接第五电阻R5，第五电阻R5为限流电阻。所述第一晶体管Q3的栅极与所述第一晶体管Q3的源极之间并联第十电阻R10，第十电阻R10为所述第一晶体管Q3的栅极及源极之间的放电电阻。
进一步地，所述PWM获取电路10还包括用于限流的上拉电阻R4，所述上拉电阻R4并联在所述第一晶体管Q3的栅极与所述基准源VCC之间，通过所述上拉电阻R4使得当所述PWM输出端口无PWM信号时，所述信号转换电路100以满载输出。更进一步地，上拉电阻R4与所述第一晶体管Q3的栅极之间连接有第一二极管D1，第一二极管D1为防止反偏二极管。
本实施例中，所述推挽电路20包括串联的第二晶体管Q2和第三晶体管Q1。
进一步地，所述第二晶体管Q2和所述第三晶体管Q1均为NMOS管，所述第二晶体管Q2的栅极接所述第一晶体管Q3的漏极，所述第二晶体管Q2的源极接地，所述第二晶体管Q2的漏极与所述第三晶体 管Q1的源极连接，所述第三晶体管Q1的栅极接所述第一晶体管Q3的栅极，所述第三晶体管Q1的漏极接参考电压Vref。
更进一步地，所述第二晶体管Q2的栅极与所述第一晶体管Q3的漏极之间连接第六电阻R6，第六电阻R6为限流电阻。所述第二晶体管Q2的栅极与所述第二晶体管Q2的源极之间并联第九电阻R9，第九电阻R9为所述第二晶体管Q3的栅极及源极之间的放电电阻。
进一步地，所述充放电电路30包括第一电阻R1、第二电阻R2、第三电阻R7及电容C1，所述第一电阻R1连接在所述第三晶体管Q1的漏极与所述参考电压Vref之间，所述第二电阻R2一端连接在所述第二晶体管Q2的漏极与所述第三晶体管Q1的源极连接点，所述第二电阻R2另一端连接所述电容C1，所述电容C1的另一端接地，所述第三电阻R7与所述电容C1并联。
其中，所述第一电阻R1、所述第二电阻R2及所述电容C1组成RC滤波电路，RC滤波是为了给基准提供稳定的基准电压，滤掉干扰信号。
PWM输出端口输出PWM信号经第一晶体管Q3反向后，使得PWM信号与推挽电路的推挽输出同相，经过第三晶体管Q1和第二晶体管Q2组成的推挽线路可实现0-100％的调光控制。PWM输出端口输出的调光信号为占空比D可调的方波，该方波信号直接控制第一晶体管Q3的栅极。当处于方波高电平段时，第一晶体管Q3导通，第一晶体管Q3的VDS电压变低，第二晶体管Q2的VGS变低，第二晶体管Q2关断，同时第三晶体管Q1导通，基准电压Vref经过第一电阻R1和第二电阻R2后给电容C1充电。当处于方波低电平段时，第一晶体管Q3关闭，第二晶体管Q2的VGS变高，第二晶体管Q2导通，同时第三晶体管Q1关闭，电容C1经过第二电阻R2和第三电阻R7放电。如此反复，PWM输入端的占空比D为可调的方波信号，经过第三晶体管Q1和第二晶体管Q2组成的的推挽电路后，电容C1两端电压Vninv与PWM调光信号的关系为：Vninv＝Vref*D，其中，D为PWM信号的占空比。由此使得本发明信号转换电路具有信号转换高精度的特点。
图3是根据本发明一个实施例的调光LED驱动电源的示意性结构框图。本发明还提供了一种调光LED驱动电源1，一般性可以包括上述实施例中所述的信号转换电路100及PWF调光电路200，所述PWF 调光电路200具有所述PWM输出端口。
本发明所述的调光LED驱动电源包括所述信号转换电路的全部技术特征，因此其通过PWM获取电路获取PWM信号，通过推挽电路根据所述PWM信号实现线路转换，通过充放电电路实现充电或放电，进而通过PWM信号调节基准电压。由于本发明的电路结构没有采用方案复杂的采样运算放大器，因此本发明线路简单，可有效降低电路成本。另外本发明调光LED驱动电源还具有信号转换精度高的优点。
图4是根据本发明一个实施例的灯具的示意性结构框图。本发明还提供了一种灯具I，一般性可包括上述实施例中的所述调光LED驱动电源1，以及作为负载的光源器件2，所述负载的光源器件2连接至所述调光LED驱动电源1。
本发明所述灯具包括所述信号转换电路的全部技术特征，因此其通过PWM获取电路获取PWM信号，通过推挽电路根据所述PWM信号实现线路转换，通过充放电电路实现充电或放电，进而通过PWM信号调节基准电压，进而实现灯具的调光。由于本发明的电路结构没有采用方案复杂的采样运算放大器，因此本发明线路简单，可有效降低电路成本。
在此处所提供的说明书中，说明了大量具体细节。然而，能够理解，本发明的实施例可以在没有这些具体细节的情况下实践。在一些实例中，并未详细示出公知的方法、结构和技术，以便不模糊对本说明书的理解。
类似地，应当理解，为了精简本公开并帮助理解各个发明方面中的一个或多个，在上面对本发明的示例性实施例的描述中，本发明的各个特征有时被一起分组到单个实施例、图、或者对其的描述中。然而，并不应将该公开的方法解释成反映如下意图：即所要求保护的本发明要求比在每个权利要求中所明确记载的特征更多的特征。更确切地说，如下面的权利要求书所反映的那样，发明方面在于少于前面公开的单个实施例的所有特征。因此，遵循具体实施方式的权利要求书由此明确地并入该具体实施方式，其中每个权利要求本身都作为本发明的单独实施例。
本领域那些技术人员可以理解，可以对实施例中的设备中的模块进行自适应性地改变并且把它们设置在与该实施例不同的一个或多个 设备中。可以把实施例中的模块或单元或组件组合成一个模块或单元或组件，以及此外可以把它们分成多个子模块或子单元或子组件。除了这样的特征和/或过程或者单元中的至少一些是相互排斥之外，可以采用任何组合对本说明书(包括伴随的权利要求、摘要和附图)中公开的所有特征以及如此公开的任何方法或者设备的所有过程或单元进行组合。除非另外明确陈述，本说明书(包括伴随的权利要求、摘要和附图)中公开的每个特征可以由提供相同、等同或相似目的的替代特征来代替。
此外，本领域的技术人员能够理解，尽管在此所述的一些实施例包括其它实施例中所包括的某些特征而不是其它特征，但是不同实施例的特征的组合意味着处于本发明的范围之内并且形成不同的实施例。例如，在权利要求书中，所要求保护的实施例的任意之一都可以以任意的组合方式来使用。
本发明的各个部件实施例可以以硬件实现，或者以在一个或者多个处理器上运行的软件模块实现，或者以它们的组合实现。本领域的技术人员应当理解，可以在实践中使用微处理器或者数字信号处理器(DSP)来实现根据本发明实施例的灯具中的一些或者全部部件的一些或者全部功能。本发明还可以实现为用于执行这里所描述的方法的一部分或者全部的设备或者装置程序(例如，计算机程序和计算机程序产品)。这样的实现本发明的程序可以存储在计算机可读介质上，或者可以具有一个或者多个信号的形式。这样的信号可以从因特网网站上下载得到，或者在载体信号上提供，或者以任何其他形式提供。
应该注意的是上述实施例对本发明进行说明而不是对本发明进行限制，并且本领域技术人员在不脱离所附权利要求的范围的情况下可设计出替换实施例。在权利要求中，不应将位于括号之间的任何参考符号构造成对权利要求的限制。单词“包含”不排除存在未列在权利要求中的元件或步骤。位于元件之前的单词“一”或“一个”不排除存在多个这样的元件。本发明可以借助于包括有若干不同元件的硬件以及借助于适当编程的计算机来实现。在列举了若干装置的单元权利要求中，这些装置中的若干个可以是通过同一个硬件项来具体体现。单词第一、第二、以及第三等的使用不表示任何顺序。可将这些单词解释为名称。
至此，本领域技术人员应认识到，虽然本文已详尽示出和描述了本发明的多个示例性实施例，但是，在不脱离本发明精神和范围的情况下，仍可根据本发明公开的内容直接确定或推导出符合本发明原理的许多其他变型或修改。因此，本发明的范围应被理解和认定为覆盖了所有这些其他变型或修改。

Claims (9)

  1. 一种信号转换电路(100)，用于通过PWM信号调节基准电压，其特征在于，包括：
    基准源(VCC)，用于提供供电电压；
    PWM获取电路(10)，连接PWM输出端口，用于获取PWM信号；
    推挽电路(20)，与所述基准源(VCC)及所述PWM获取电路(10)相连，用于根据所述PWM信号实现线路转换；和
    充放电电路(30)，与所述推挽电路(20)相连，用于根据推挽线路的转换实现充电或放电；
    其中，所述PWM输出端口输出占空比可调的方波，所述方波处于高电平段时，所述充放电电路(30)充电；所述方波处于低电平段时，所述充放电电路(30)放电。
  2. 根据权利要求1所述的信号转换电路，其特征在于，所述PWM获取电路(10)包括第一晶体管(Q3)。
  3. 根据权利要求2所述的信号转换电路，其特征在于，所述第一晶体管(Q3)为NMOS管，所述第一晶体管(Q3)的栅极连接所述PWM输出端口，所述第一晶体管(Q3)的漏极接所述基准源(VCC)，所述第一晶体管(Q3)的源极接地。
  4. 根据权利要求3所述的信号转换电路，其特征在于，所述PWM获取电路(10)还包括上拉电阻(R4)，所述上拉电阻(R4)并联在所述第一晶体管(Q3)的栅极与所述基准源(VCC)之间，
    通过所述上拉电阻(R4)使得当所述PWM输出端口无PWM信号时，所述信号转换电路以满载输出。
  5. 根据权利要求3所述的信号转换电路，其特征在于，所述推挽电路(20)包括串联的第二晶体管(Q2)和第三晶体管(Q1)。
  6. 根据权利要求5所述的信号转换电路，其特征在于，所述第二晶体管(Q2)和所述第三晶体管(Q1)均为NMOS管，所述第二晶体管(Q2)的栅极接所述第一晶体管(Q3)的漏极，所述第二晶体管(Q2)的源极接地，所述第二晶体管(Q2)的漏极与所述第三晶体管(Q1)的源极连接，所述第三晶体管(Q1)的栅极接所述第一晶体管(Q3) 的栅极，所述第三晶体管(Q1)的漏极接参考电压(Vref)。
  7. 根据权利要求6所述的信号转换电路，其特征在于，所述充放电电路(30)包括第一电阻(R1)、第二电阻(R2)、第三电阻(R7)及电容(C1)，
    所述第一电阻(R1)连接在所述第三晶体管(Q1)的漏极与所述参考电压(Vref)之间，所述第二电阻(R2)一端连接在所述第二晶体管(Q2)的漏极与所述第三晶体管(Q1)的源极连接点，所述第二电阻(R2)另一端连接所述电容(C1)，所述电容(C1)的另一端接地，所述第三电阻(R7)与所述电容(C1)并联；
    所述方波处于高电平段时，所述第一晶体管(Q3)导通，所述第二晶体管(Q2)关闭，所述第三晶体管(Q1)导通，所述参考电压(Vref)经所述第一电阻(R1)和所述第二电阻(R2)给所述电容(C1)充电；
    所述方波处于低电平段时，所述第一晶体管(Q3)关闭，所述第二晶体管(Q2)导通，所述第三晶体管(Q1)关闭，所述电容(C1)经过所述第二电阻(R2)和所述第三电阻(R7)放电。
  8. 一种调光LED驱动电源(1)，其特征在于，包括权利要求1-7中任一项所述的信号转换电路(100)及PWF调光电路(200)，所述PWF调光电路具有所述PWM输出端口。
  9. 一种灯具(I)，其特征在于，包括权利要求8所述的调光LED驱动电源(1)；以及
    作为负载的光源器件(2)，连接至所述调光LED驱动电源(1)。
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