WO2014048102A1 - 脉冲功率稳定输出装置 - Google Patents

脉冲功率稳定输出装置 Download PDF

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Publication number
WO2014048102A1
WO2014048102A1 PCT/CN2013/073682 CN2013073682W WO2014048102A1 WO 2014048102 A1 WO2014048102 A1 WO 2014048102A1 CN 2013073682 W CN2013073682 W CN 2013073682W WO 2014048102 A1 WO2014048102 A1 WO 2014048102A1
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Prior art keywords
output
transistor
comparator
coil
input
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PCT/CN2013/073682
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English (en)
French (fr)
Inventor
吴槐
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Wu Huai
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Publication of WO2014048102A1 publication Critical patent/WO2014048102A1/zh

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/217Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/2176Conversion of ac power input into dc power output without possibility of reversal 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 comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30Driver circuits
    • H05B45/37Converter circuits
    • H05B45/3725Switched mode power supply [SMPS]
    • H05B45/382Switched mode power supply [SMPS] with galvanic isolation between input and output
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a pulse power output device, and more particularly to a pulse power stabilized output device.
  • Fig. 1 is a schematic diagram of a conventional pulse power output device.
  • the first comparator inputs the output result to a multiplier by comparing the reference voltage with the input voltage, and the multiplier performs a corresponding operation according to the result and a multiplication signal, and then inputs the result to the
  • the second comparator is controlled by a control signal to control a PWM/PFM drive unit.
  • the PWM/PFM driving unit outputs a high level or a low level to control the on and off of the transistor Q, thereby controlling the transformer T to supply power to the load, realizing a high power factor, but failing to realize the power stable output synchronously, and the output is required.
  • the power is detected and fed back to the PWM/PFM drive unit for control.
  • an object of the present invention is to provide a pulse power stable output device that makes the output of the device more stable and has a simpler circuit structure.
  • a pulse power stable output device including a PWM/PFM driving unit (ie, a pulse width modulator or a pulse frequency modulator), characterized in that: the PWM/PFM driving unit output end Connecting a control terminal of a transistor; one end of the transistor is connected to one end of a resistor and a positive input terminal of a comparator; the other end of the resistor is grounded; and the negative input end of the comparator is connected to an output end of a pulsating reference generating unit
  • the output end of the comparator is connected to the control end of the PWM/PFM driving unit; the other end of the transistor is connected to one end of an energy storage inductor coil; and the other end of the energy storage inductor coil is connected to a full bridge rectifier circuit.
  • the positive terminal of the output terminal and the input terminal of the pulsation reference generating unit; the input terminal of the full bridge rectifier circuit is connected to the mains input.
  • the pulsation reference generating unit includes a comparator, wherein: an output end of the comparator is connected to one end of a first resistor, one end of a second resistor, and a a positive input end of the diode, a negative input end of the comparator is connected to one end of a capacitor and a negative end of the diode, a positive input end of the comparator is connected to a reference voltage; and the other end of the second resistor is grounded; The other end of the capacitor is grounded; the other end of the first resistor serves as an input of the pulsation reference generating means; and the output of the comparator serves as an output of the pulsation reference generating means.
  • a power supply coil is further provided, one end of the power supply coil is grounded, and the other end of the power supply coil is connected to a power supply end of the pulsation reference generating unit and a PWM/ via a rectifying and filtering network.
  • PFM drive unit The power supply end, the power supply coil and the energy storage coil are wound on the same magnetic core.
  • An embodiment of the present invention further includes a start-up circuit, an input end of the start-up circuit is connected to an output end of the full-bridge rectifier circuit, and an output end of the start-up circuit is connected to the pulsation reference generation unit. Power terminal and power supply terminal of PWM/PFM drive unit.
  • the method further includes a rectifying and filtering network, an input end of the rectifying and filtering network is connected to one end of the resistor, and an output end of the rectifying and filtering network is connected to a positive input end of the comparator.
  • a load and a power output coil are further included.
  • the power output coil supplies power to the load through a rectifying and filtering network, and the power output coil and the energy storage coil are wound. On the same core.
  • a load is further included, an input end of the load is connected to an output terminal of the full-bridge rectifier circuit, and an output end of the load is connected to another end of the energy storage coil;
  • the energy storage coil supplies power to the load via a rectifying and filtering network.
  • the transistor is a MOS transistor; a gate of the MOS transistor serves as a control terminal of the transistor, a source of the MOS transistor serves as one end of the transistor, and the MOS The drain of the tube acts as the other end of the transistor.
  • the transistor is a triode; a base of the triode serves as a control end of the transistor, an emitter of the triode serves as one end of the transistor, and a collector of the triode As the other end of the transistor
  • the pulse power stable output device of the invention has the advantages of stable output power, simple circuit structure, simple manufacturing process and low manufacturing cost.
  • FIG. 1 is a schematic diagram of a conventional pulse power output device.
  • FIG. 2 is a schematic diagram of a pulse power stable output device of the present invention.
  • FIG. 3 is a schematic diagram of a pulsation reference generating unit in a pulse power stable output device according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an embodiment of a pulse power stable output device of the present invention.
  • FIG. 5 is a schematic diagram of another embodiment of a pulse power stable output device of the present invention.
  • FIG. 6 is a schematic diagram showing the synchronization of the mains input voltage Vin, the ripple reference voltage Vf, and the voltage V3 after passing through the rectifying and filtering network composed of the third diode D3 and the third capacitor C3.
  • the embodiment provides a pulse power stable output device, including a PWM/PFM driving unit, wherein: the output end of the PWM/PFM driving unit is connected to a control end of a transistor; and one end of the transistor is connected to a resistor.
  • FIG. 2 is a schematic diagram of a pulse power stable output device of the present invention.
  • the embodiment provides a pulse power stable output device, including a PWM/PFM driving unit 3, wherein: the output end of the PWM/PFM driving unit 3 is connected to a control terminal of a transistor Q; One end of Q is connected to one end of a resistor R and a positive input terminal of a comparator 2; the other end of the resistor R is grounded; the negative input end of the comparator 2 is connected to an output end of a pulsation reference generating unit 1, the comparison
  • the output end of the capacitor 2 is connected to the control end of the PWM/PFM driving unit 3; the other end of the transistor Q is connected to one end of a storage inductor L; and the other end of the energy storage inductor L is connected to a full bridge rectification
  • An output terminal of the circuit and an input terminal of the ripple reference generating unit 1; an input end of the full bridge rectifier circuit is connected to
  • FIG. 3 is a schematic diagram of a pulsation reference generating unit in a pulse power stable output device according to an embodiment of the present invention.
  • the embodiment provides a pulsation reference generating unit, including a comparator, wherein: the output end of the comparator is connected to one end of a first resistor R1, one end of a second resistor R2, and a first a positive terminal of the diode D, a negative input terminal of the comparator is connected to one end of a capacitor C and a negative terminal of the diode D, and a positive input terminal of the comparator is connected to a reference voltage, and a voltage regulation value of the reference voltage 0.7V; the other end of the second resistor R2 is grounded; the other end of the capacitor C is grounded; the other end of the first resistor R1 serves as an input of the pulsation reference generating device; The end serves as the output of the pulsation reference generating means.
  • FIG. 4 is a schematic diagram of an embodiment of a pulse power stable output device of the present invention.
  • the embodiment provides a pulse power stable output device, including a PWM/PFM driving unit 3, wherein: the output end of the PWM/PFM driving unit 3 is connected to a gate of a MOS transistor Q; The source of the MOS transistor Q is connected to one end of a resistor R and an input terminal of a rectifying filter network composed of a third diode D3 and a third capacitor C3; the third diode D3 and the third capacitor C3 are formed.
  • the output of the rectifying and filtering network is connected to the positive input terminal of the comparator 2; the other end of the resistor R is grounded; the negative input terminal of the comparator 2 is connected to the output end of a pulsating reference generating unit 1, the comparator 2
  • the output end of the transformer is connected to the control terminal of the PWM/PFM driving unit 3; the drain of the MOS transistor Q is connected to the second end of the transformer T primary coil; the first end of the transformer T primary coil is connected to a load 4
  • An output end of the load 4 is connected to an output end of a full bridge rectifier circuit and an input end of the pulsation reference generation unit 1;
  • the input of the road is connected to the mains input Vin.
  • a start-up circuit 5 is further included, an input end of the start-up circuit 5 is connected to an output end of the full-bridge rectifier circuit, and an output end of the start-up circuit 5 is connected to a power supply end of the ripple reference generation unit 1 and a PWM/PFM drive.
  • a rectifying filter network consisting of a first diode D1 and a first capacitor C1 is also included, through which the transformer T primary coil supplies power to the load 4.
  • FIG. 5 is a schematic diagram of another embodiment of a pulse power stable output device of the present invention.
  • the embodiment provides a pulse power stable output device, including a PWM/PFM driving unit 3, wherein: the output end of the PWM/PFM driving unit 3 is connected to a base of an NPN type transistor Q; The emitter of the NPN transistor Q is connected to one end of a resistor R and an input terminal of a rectifying filter network composed of a third diode D3 and a third capacitor C3; the third diode D3 and the third capacitor The output end of the rectification filter network composed of C3 is connected to the positive input terminal of the comparator 2; the other end of the resistor R is grounded; the negative input terminal of the comparator 2 is connected to the output end of a pulsation reference generating unit 1, the comparison The output end of the device 2 is connected to the control end of the PWM/PFM driving unit 3; the collector of the NPN-type transistor Q is connected
  • the second end of the power supply coil is grounded, and the first end of the power supply coil is connected to the pulsation reference generating unit 1 via a rectifying and filtering network composed of a second diode D2 and a second capacitor C2.
  • an input end of the starting circuit 5 is connected to an output end of the full bridge rectifying circuit, and an output end of the starting circuit 5 is connected to a power end of the pulsating reference generating unit 1 and a PWM/PFM driving The power terminal of unit 3.
  • a load 4 is further included, and the power output coil of the transformer T supplies power to the load 4 via a rectifying and filtering network composed of a first diode D1 and a first capacitor C1.
  • the mains input Vin passes through a full bridge rectifier circuit and then charges the capacitor C2 through the start circuit 5 and supplies voltage to the pulsation reference generating unit 1 and the PWM/PFM driving unit 3.
  • the PWM/PFM driving unit 3 outputs a high level to the base of the NPN type transistor Q to be turned on.
  • the commercial power input Vin passes through the full bridge rectifier circuit, passes through the transformer T primary coil, and then passes through the NPN type transistor Q. Flowing through a resistor R to ground forms a current path. Because of the current sampling of resistor R, the voltage across resistor R provides a feedback voltage to comparator 2 at the positive input through a rectified filter network consisting of diode D3 and capacitor C3.
  • the feedback voltage gradually increases with the start of the circuit due to the presence of the primary winding of the transformer T until the feedback voltage is greater than the ripple reference voltage provided by the ripple reference generation unit 1 for the negative input of the comparator 2, Comparator 2 outputs a high level, which controls the PWM/PFM drive unit 3 to output a low Level.
  • the base of the NPN transistor Q is loaded with a low level, and the power output coil of the transformer T starts to release energy to the load, and the power supply coil also charges the capacitor C2.
  • the output voltage of the power supply coil of the transformer T is reduced to 0V due to the release of energy, the output voltage of the PWM/PFM drive unit returns to a high voltage and enters the next cycle. As shown in FIG.

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Abstract

本发明涉及一种脉冲功率稳定输出装置,包括PWM/PFM驱动单元,其特征在于:所述PWM/PFM驱动单元输出端连接一晶体管的控制端;所述晶体管的一端连接一电阻的一端和一比较器的正输入端;所述电阻另一端接地;所述比较器的负输入端连接一脉动基准发生单元的输出端,所述比较器的输出端连接所述PWM/PFM驱动单元的控制端;所述晶体管的另一端连接一储能电感线圈的一端;所述储能电感线圈的另一端连接一全桥整流电路的输出端正极和所述脉动基准发生单元的输入端;所述全桥整流电路的输入端连接市电输入。该装置输出功率稳定,并且具有电路结构简单,制作工艺简单,制作成本低等优点。

Description

脉冲功率稳定输出装置 技术领域
[0001] 本发明涉及一种脉冲功率输出装置, 尤其是一种脉冲功率稳定输出装置。
背景技术
[0002】 目前, 为了使功率输出比较稳定且功率因素高, 一般都采用乘法器结合比较器来控制
PWM/PFM驱动单元的方法。 但是, 利用该方法制作的装置, 结构复杂, 生产工艺复杂, 成 本较高。 如图 1所示, 图 1是现有的脉冲功率输出装置原理图。 请参照图 1, 该装置中, 第 一比较器通过对比基准电压与输入电压, 将输出结果输入到一乘法器中, 该乘法器根据该结 果以及一乘法信号进行相应的运算后将结果输入到一第二比较器中, 该第二比较器由一控制 信号控制, 从而控制一 PWM/PFM驱动单元。 该 PWM/PFM驱动单元输出一高电平或一低电 平, 用以控制晶体管 Q的通断, 从而控制变压器 T为负载供电, 实现高功率因素, 但无法 同步实现功率稳定输出, 需要对输出功率进行检测后反馈给 PWM/PFM驱动单元进行控制。 发明内容
[0003] 有鉴于此,本发明的目的是提供一种脉冲功率稳定输出装置,使该装置输出更加稳定, 并且电路结构更加简单。
[0004] 本发明采用以下方案实现:一种脉冲功率稳定输出装置,包括 PWM/PFM驱动单元 (即 脉冲宽度调制器或者脉冲频率调制器), 其特征在于: 所述 PWM/PFM驱动单元输出端连接一 晶体管的控制端; 所述晶体管的一端连接一电阻的一端和一比较器的正输入端; 所述电阻另 一端接地; 所述比较器的负输入端连接一脉动基准发生单元的输出端, 所述比较器的输出端 连接所述 PWM/PFM驱动单元的控制端; 所述晶体管的另一端连接一储能电感线圈的一端; 所述储能电感线圈的另一端连接一全桥整流电路的输出端正极和所述脉动基准发生单元的输 入端; 所述全桥整流电路的输入端连接市电输入。
[0005] 在本发明一实施例中, 所述脉动基准发生单元, 包括一比较器, 其特征在于: 所述比 较器的输出端连接一第一电阻的一端、 一第二电阻的一端和一二极管的正极端, 所述比较器 的负输入端连接一电容的一端和所述二极管的负极端, 所述比较器的正输入端连接一基准电 压; 所述第二电阻的另一端接地; 所述电容的另一端接地; 所述第一电阻的另一端作为所述 脉动基准发生装置的输入端; 所述比较器的输出端作为所述脉动基准发生装置的输出端。
[0006] 在本发明一实施例中, 还包括一供电线圈, 所述供电线圈的一端接地, 所述供电线圈 的另一端经过一整流滤波网络连接所述脉动基准发生单元的电源端和 PWM/PFM驱动单元的 电源端, 所述供电线圈与所述储能线圈绕制在同一磁芯上。
[0007] 在本发明一实施例中, 还包括一启动电路, 所述启动电路的输入端连接所述全桥整流 电路的输出端, 所述启动电路的输出端连接所述脉动基准发生单元的电源端和 PWM/PFM驱 动单元的电源端。
[0008] 在本发明一实施例中, 还包括一整流滤波网络, 所述整流滤波网络的输入端连接所述 电阻的一端, 所述整流滤波网络的输出端连接所述比较器的正输入端。
[0009] 在本发明一实施例中, 还包括一负载和一功率输出线圈, 所述功率输出线圈经过一整 流滤波网络为所述负载供电, 所述功率输出线圈与所述储能线圈绕制在同一磁芯上。
[0010] 在本发明一实施例中, 还包括一负载, 所述负载的输入端连接所述全桥整流电路的输 出端正极, 所述负载的输出端连接所述储能线圈的另一端; 所述储能线圈经过一整流滤波网 络为所述负载供电。
[0011】 在本发明一实施例中, 所述晶体管是 MOS管; 所述 MOS管的栅极作为所述晶体管的 控制端, 所述 MOS管的源极作为所述晶体管的一端, 所述 MOS管的漏极作为所述晶体管的 另一端。
[0012】 在本发明一实施例中, 所述晶体管是三极管; 所述三极管的基极作为所述晶体管的控 制端, 所述三极管的发射极作为所述晶体管的一端, 所述三极管的集电极作为所述晶体管的 另一端
本发明的脉冲功率稳定输出装置具有输出功率稳定, 电路结构简单, 制作工艺简单, 制作成 本低等优点。
附图说明
[0013] 图 1是现有的脉冲功率输出装置原理图。
[0014] 图 2是本发明一种脉冲功率稳定输出装置原理图。
[0015】 图 3是本发明实施例中一种脉冲功率稳定输出装置中脉动基准发生单元的原理图。
[0016】 图 4是本发明一种脉冲功率稳定输出装置一实施例原理图。
[0017] 图 5是本发明一种脉冲功率稳定输出装置另一实施例原理图。
[0018】 图 6是本发明市电输入电压 Vin、 脉动基准电压 Vf和经过由第三二极管 D3和第三电 容 C3组成的整流滤波网络后的电压 V3同步的示意图。
具体实施方式
[0019] 为使本发明的目的、 技术方案及优点更加清楚明白, 以下将通过具体实施例和相关附 图, 对本发明作进一步详细说明。 [0020] 本实施例提供一种脉冲功率稳定输出装置, 包括 PWM/PFM驱动单元, 其特征在于: 所述 PWM/PFM驱动单元输出端连接一晶体管的控制端; 所述晶体管的一端连接一电阻的一 端和一比较器的正输入端; 所述电阻另一端接地; 所述比较器的负输入端连接一脉动基准发 生单元的输出端, 所述比较器的输出端连接所述 PWM/PFM驱动单元的控制端; 所述晶体管 的另一端连接一储能电感线圈的一端; 所述储能电感线圈的另一端连接一全桥整流电路的输 出端正极和所述脉动基准发生单元的输入端; 所述全桥整流电路的输入端连接市电输入。
[0021] 如图 2所示, 图 2是本发明一种脉冲功率稳定输出装置原理图。 请参照图 2, 本实施 例提供一种脉冲功率稳定输出装置,包括 PWM/PFM驱动单元 3,其特征在于:所述 PWM/PFM 驱动单元 3输出端连接一晶体管 Q的控制端;所述晶体管 Q的一端连接一电阻 R的一端和一 比较器 2的正输入端; 所述电阻 R另一端接地; 所述比较器 2的负输入端连接一脉动基准发 生单元 1的输出端, 所述比较器 2的输出端连接所述 PWM/PFM驱动单元 3的控制端; 所述 晶体管 Q的另一端连接一储能电感线圈 L的一端;所述储能电感线圈 L的另一端连接一全桥 整流电路的输出端正极和所述脉动基准发生单元 1的输入端; 所述全桥整流电路的输入端连 接市电输入 Vin。
[0022】 如图 3所示, 图 3是本发明实施例中一种脉冲功率稳定输出装置中脉动基准发生单元 的原理图。 请参照图 3, 本实施例提供一种脉动基准发生单元, 包括一比较器, 其特征在于: 所述比较器的输出端连接一第一电阻 R1的一端、一第二电阻 R2的一端和一二极管 D的正极 端, 所述比较器的负输入端连接一电容 C的一端和所述二极管 D的负极端, 所述比较器的正 输入端连接一基准电压, 所述基准电压的稳压值为 0.7V; 所述第二电阻 R2的另一端接地; 所述电容 C的另一端接地; 所述第一电阻 R1的另一端作为所述脉动基准发生装置的输入端; 所述比较器的输出端作为所述脉动基准发生装置的输出端。
[0023] 如图 4所示, 图 4是本发明一种脉冲功率稳定输出装置一实施例原理图。请参照图 4, 本实施例提供一种脉冲功率稳定输出装置, 包括 PWM/PFM驱动单元 3, 其特征在于: 所述 PWM/PFM驱动单元 3输出端连接一 M0S管 Q的栅极;所述 M0S管 Q的源极连接一电阻 R 的一端和一由第三二极管 D3和第三电容 C3组成的整流滤波网络的输入端;所述由第三二极 管 D3和第三电容 C3组成的整流滤波网络的输出端连接一比较器 2的正输入端; 所述电阻 R 另一端接地; 所述比较器 2的负输入端连接一脉动基准发生单元 1的输出端, 所述比较器 2 的输出端连接所述 PWM/PFM驱动单元 3的控制端; 所述 M0S管 Q的漏极连接一变压器 T 初级线圈的第二端; 所述变压器 T初级线圈的第一端连接一负载 4的输出端; 所述负载 4的 输入端连接一全桥整流电路的输出端和所述脉动基准发生单元 1的输入端; 所述全桥整流电 路的输入端连接市电输入 Vin。 还包括一供电线圈, 所述供电线圈第二端接地, 所述供电线 圈第一端经过一由第二二极管 D2和第二电容 C2组成的整流滤波网络连接所述脉动基准发生 单元 1的电源端和 PWM/PFM驱动单元 3的电源端。 还包括一启动电路 5, 所述启动电路 5 的输入端连接所述全桥整流电路的输出端, 所述启动电路 5的输出端连接所述脉动基准发生 单元 1的电源端和 PWM/PFM驱动单元 3的电源端。 还包括一由第一二极管 D1和第一电容 C1组成的整流滤波网络, 所述变压器 T初级线圈经过该网络为所述负载 4供电。
[0024] 如图 5所示, 图 5是本发明一种脉冲功率稳定输出装置另一实施例原理图。 请参照图 5, 本实施例提供一种脉冲功率稳定输出装置, 包括 PWM/PFM驱动单元 3, 其特征在于:所 述 PWM/PFM驱动单元 3输出端连接一 NPN型三极管 Q的基极;所述 NPN型三极管 Q的发 射极连接一电阻 R的一端和一由第三二极管 D3和第三电容 C3组成的整流滤波网络的输入 端;所述由第三二极管 D3和第三电容 C3组成的整流滤波网络的输出端连接一比较器 2的正 输入端; 所述电阻 R另一端接地; 所述比较器 2的负输入端连接一脉动基准发生单元 1的输 出端, 所述比较器 2的输出端连接所述 PWM/PFM驱动单元 3的控制端; 所述 NPN型三极 管 Q的集电极连接一变压器 T初级线圈的第二端;所述变压器 T初级线圈的第一端连接一全 桥整流电路的输出端和所述脉动基准发生单元 1的输入端; 所述全桥整流电路的输入端连接 市电输入 Vin。 还包括一供电线圈, 所述供电线圈第二端接地, 所述供电线圈第一端经过一 由第二二极管 D2和第二电容 C2组成的整流滤波网络连接所述脉动基准发生单元 1的电源端 和 PWM/PFM驱动单元 3的电源端。 还包括一启动电路 5, 所述启动电路 5的输入端连接所 述全桥整流电路的输出端, 所述启动电路 5的输出端连接所述脉动基准发生单元 1的电源端 和 PWM/PFM驱动单元 3的电源端。 还包括一负载 4, 所述变压器 T的功率输出线圈经过一 由第一二极管 D1和第一电容 C1组成的整流滤波网络为所述负载 4供电。
[0025] 请继续参照图 5, 下面说明上述实施例的原理如下:
启动该装置时,市电输入 Vin经过一全桥整流电路后通过启动电路 5为电容 C2充电并为脉动 基准发生单元 1和 PWM/PFM驱动单元 3提供电压。 PWM/PFM驱动单元 3输出一高电平到 NPN型三极管 Q的基极使其导通,此时, 市电输入 Vin经过全桥整流电路后通过变压器 T初 级线圈, 再经过 NPN型三极管 Q, 流经一电阻 R到地, 形成一个电流通路。 因为电阻 R的 电流取样作用, 电阻 R两端电压通过由二极管 D3和电容 C3组成的整流滤波网络为比较器 2 提供一个正输入端的反馈电压。 该反馈电压由于变压器 T的初级线圈的存在, 会随着电路的 启动而慢慢变大, 直到该反馈电压大于脉动基准发生单元 1为比较器 2的负输入端提供的脉 动基准电压时, 控制比较器 2输出一高电平, 该高电平控制 PWM/PFM驱动单元 3输出一低 电平。 NPN型三极管 Q的基极因施加了低电平而载止,变压器 T的功率输出线圈开始向负载 释放能量, 供电线圈也向电容 C2充电。 当变压器 T的供电线圈输出电压因能量释放完毕而 降为 0V时, PWM/PFM驱动单元的输出电压又恢复为高电压,进入下一个循环。如图 6所示, 因为脉动基准电压 Vf与市电输入电压 Vin同步且稳定, 所以电阻 R上取样的电流的峰值包 络电压经过由第三二极管 D3和第三电容 C3组成的整流滤波网络后的电压 V3与市电同步且 稳定, 实现功率输出稳定。
[0026] 上列较佳实施例, 对本发明的目的、 技术方案和优点进行了进一步详细说明, 所应理 解的是, 以上所述仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡在本发明的精神 和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权利要求书
1.一种脉冲功率稳定输出装置, 包括 PWM/PFM驱动单元, 其特征在于: 所述 PWM/PFM驱 动单元输出端连接一晶体管的控制端; 所述晶体管的一端连接一电阻的一端和一比较器的正 输入端; 所述电阻另一端接地; 所述比较器的负输入端连接一脉动基准发生单元的输出端, 所述比较器的输出端连接所述 PWM/PFM驱动单元的控制端; 所述晶体管的另一端连接一储 能电感线圈的一端; 所述储能电感线圈的另一端连接一全桥整流电路的输出端正极和所述脉 动基准发生单元的输入端; 所述全桥整流电路的输入端连接市电输入。
2.根据权利要求 1所述的脉冲功率稳定输出装置, 其特征在于: 所述脉动基准发生单元, 包 括一比较器, 其特征在于: 所述比较器的输出端连接一第一电阻的一端、 一第二电阻的一端 和一二极管的正极端, 所述比较器的负输入端连接一电容的一端和所述二极管的负极端, 所 述比较器的正输入端连接一基准电压; 所述第二电阻的另一端接地; 所述电容的另一端接地; 所述第一电阻的另一端作为所述脉动基准发生装置的输入端; 所述比较器的输出端作为所述 脉动基准发生装置的输出端。
3.根据权利要求 1所述的脉冲功率稳定输出装置, 其特征在于: 还包括一供电线圈, 所述供 电线圈的一端接地, 所述供电线圈的另一端经过一整流滤波网络连接所述脉动基准发生单元 的电源端和 PWM/PFM驱动单元的电源端,所述供电线圈与所述储能线圈绕制在同一磁芯上。
4.根据权利要求 3所述的脉冲功率稳定输出装置, 其特征在于: 还包括一启动电路, 所述启 动电路的输入端连接所述全桥整流电路的输出端, 所述启动电路的输出端连接所述脉动基准 发生单元的电源端和 PWM/PFM驱动单元的电源端。
5.根据权利要求 1所述的脉冲功率稳定输出装置, 其特征在于: 还包括一整流滤波网络, 所 述整流滤波网络的输入端连接所述电阻的一端, 所述整流滤波网络的输出端连接所述比较器 的正输入端。
6.根据权利要求 1所述的脉冲功率稳定输出装置, 其特征在于: 还包括一负载和一功率输出 线圈, 所述功率输出线圈经过一整流滤波网络为所述负载供电, 所述功率输出线圈与所述储 能线圈绕制在同一磁芯上。
7.根据权利要求 1所述的脉冲功率稳定输出装置, 其特征在于: 还包括一负载, 所述负载的 输入端连接所述全桥整流电路的输出端正极,所述负载的输出端连接所述储能线圈的另一端; 所述储能线圈经过一整流滤波网络为所述负载供电。
8.根据权利要求 1所述的脉冲功率稳定输出装置, 其特征在于: 所述晶体管是 MOS管; 所 述 MOS管的栅极作为所述晶体管的控制端, 所述 MOS管的源极作为所述晶体管的一端, 所 述 MOS管的漏极作为所述晶体管的另一端。
9.根据权利要求 1所述的脉冲功率稳定输出装置, 其特征在于: 所述晶体管是三极管; 所述 三极管的基极作为所述晶体管的控制端, 所述三极管的发射极作为所述晶体管的一端, 所述 三极管的集电极作为所述晶体管的另一端。
PCT/CN2013/073682 2012-09-25 2013-04-03 脉冲功率稳定输出装置 WO2014048102A1 (zh)

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