• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention provides a switching mode power supply circuit that improves the power factor and reduces harmonic noise, the smoothing unit for smoothing the input voltage, the rectifying unit for rectifying the smoothing unit output, and the harmonics of the rectifying unit output are reduced. An attenuation part connected in parallel to the rectifier output, an output of the attenuation part is applied to an input side winding, and accordingly a switching part for releasing the output side winding, a switch part for switching a voltage applied to an input side winding of the transformer part, and the transformer The output of the negative output side winding is rectified and smoothed to generate an output voltage.
    公开号:KR19990046971A
    申请号:KR1019970065154
    申请日:1997-12-02
    公开日:1999-07-05
    发明作者:이재학
    申请人:이형도；삼성전기 주식회사；
    IPC主号:
    专利说明:

    Switching Mode Power Supply Circuit
    The present invention relates to a switch mode power supply circuit (SMPS), and more particularly to a switch mode power supply circuit in which harmonic noise is reduced.
    In general, the majority of electronic devices operate as a commercial power source, and in order to convert an AC voltage into a DC voltage, an AC power input is switched to be converted into a DC voltage. The switched AC power source is a commercial power source and includes a harmonic component of 2 times, 3 times, etc., the fundamental frequency of the AC power source. Since the power supply circuit should be configured to reduce the harmonic components.
    1 is a schematic diagram of a power supply circuit according to the prior art.
    In the power supply circuit according to the related art, in the power supply circuit in which an input voltage Vi is switched and the switched input voltage Vi is generated as an output voltage through a transformer, the input voltage Vi is smoothed. The input section 10, the rectifying section 12 to which the output of the smoothing section 10 is rectified, the attenuation section 14 to reduce harmonics of the output of the rectifying section 12, and the output of the attenuation section 14 are input sides. The transformer N is applied to the winding N1, and accordingly, a transformer T for releasing to the output side winding N2 and a switch Q for switching the voltage applied to the input side winding N1 of the transformer T are switched. do.
    In the power supply circuit according to the related art configured as described above, the input voltage Vi is smoothed by the filter 10a which is the capacitor C3, C4 and the coil L in the smoothing section 10, and the smoothing. The rectified voltage is rectified by the rectifier 12 which is a bridge diode, and the voltage rectified by the rectifier 12 is a switch S, a first capacitor C1, a second capacitor C2, a first resistor R1, and Harmonics are reduced by the attenuation part 14 constituted by the second resistor R2, which is closed according to the power source to which the switch S is input, that is, when 100 volts is input, and 200 volts is input. Is opened, and is compensated by the first capacitor C1, the second capacitor C2, the first resistor R1 and the second resistor R2.
    As described above, the output of the attenuation section 14 having reduced harmonics is switched by the switch section Q which is switched to modulate the pulse width, and is applied to the input side winding line N1 of the transformer section T, thereby output side winding line N2. ) And is generated as an output voltage Vo through an output unit (not shown).
    However, the harmonics reduced in the attenuation section 14 according to the prior art as described above has a problem that the degree of reduction is insignificant, and the power factor is reduced to about 0.4.
    Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and a main object of the present invention is to provide a switching mode power supply circuit for improving power factor and reducing harmonic noise.
    1 is a schematic diagram of a power supply circuit according to the prior art,
    2 is a switching mode power supply circuit diagram according to the present invention.
    <Description of the symbols for the main parts of the drawings>
    10, 20: smooth part 12, 22: rectifier
    14, 24: attenuation portion 10a, 20a: filter
    26: output part L2: reactor
    A feature of the present invention for achieving the above object is a smoothing unit for smoothing the input voltage, a rectifying unit for rectifying the smoothing unit output, and an attenuation unit connected in parallel to the output of the rectifying unit so that harmonics of the rectifying unit output are reduced; The output of the attenuation part is applied to the input side winding, and accordingly the transformer part for inducing the output side winding, the switch part for switching the voltage applied to the input side winding of the transformer part, and the output of the output side winding of the transformer part are rectified and smoothed. It is composed of an output unit for generating an output voltage.
    Hereinafter, a preferred embodiment of a switch mode power supply circuit according to the present invention will be described in detail with reference to the accompanying drawings.
    2 is a switching mode power supply circuit diagram according to the present invention.
    In the power supply circuit according to the present invention, the smoothing unit 20 in which the input voltage Vi is smoothed, the rectifying unit 22 in which the output of the smoothing unit 20 is rectified, and the harmonics of the output of the rectifying unit 22 are reduced. An attenuator 24 connected in parallel to the output of the rectifier 22, and an output of the attenuator 24 is applied to the input side winding N1, thereby transforming the transformer T to cause the output side winding N2 to be induced. ), The switch Q for switching the voltage applied to the input side winding N1 of the transformer T, and the output of the output side winding N2 of the transformer T are rectified and smoothed, thereby outputting an output voltage ( And an output unit 26 for generating Vo).
    The attenuator 24 includes a first capacitor C1 having one end connected in parallel to the output of the rectifier 22, a first resistor R1 connected in parallel with the first capacitor C1, and the rectifier. (22) One end is connected to the negative side of the input, the other end of the reactor (Lactor) L2 is connected to the other end of the first capacitor (C1), and one end is connected to the other end of the first capacitor (C1) And a second capacitor C2 having the other end connected to the minus side of the output of the rectifier 22 and a second resistor R2 connected in parallel with the second capacitor C2.
    The following describes the operating state of the present invention configured as described above.
    The input voltage Vi is smoothed by the third and fourth capacitors C3 and C4 in the smoothing part 20 and the filter 20a which is a coil, and the smoothed voltage is rectified in the rectifying part 22 which is a bridge diode. The voltage rectified by the rectifier 22 includes a coil L2, a first capacitor C1, a second capacitor C2, a first resistor R1, and a second resistor R2. The harmonics are greatly reduced by the unit 24. Accordingly, the power factor, which is about 0.4 in the related art, is also greatly increased to 0.85 or more.
    As described above, the current from the power source input by the reactor L2 connected between the rectifier 22 minus the bridge diode and the first capacitor C1 and the second capacitor C2 is gentle, thereby reducing harmonics. The output of the attenuation portion 14 is switched by the switch portion Q which is switched to pulse width modulation and applied to the input side winding line N1 of the transformer section T, thereby being induced to the output side winding line N2, and the output side The output of the winding N2 is rectified and smoothed to generate an output voltage Vo through the output unit 26.
    As described in detail above, in the switching mode power supply circuit according to the present invention, since the current at the power source input by the reactor connected between the rectifier minus side and the first capacitor and the second capacitor is gentle, harmonics are greatly reduced, Accordingly, the power factor is improved.
    The present invention is not limited to the above embodiments, and it is apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] A smoothing unit for smoothing an input voltage; A rectifying unit for rectifying the output of the smoothing unit; An attenuator connected in parallel to the rectifier output such that harmonics of the rectifier output are reduced; A transformer unit configured to apply an output of the attenuation unit to an input side winding, thereby inducing the output to the output side winding; A switch unit for switching a voltage applied to an input side winding of the transformer unit; And an output unit configured to generate an output voltage by rectifying and smoothing the output of the output side winding of the transformer unit.
    [2" claim-type="Currently amended] According to claim 1, wherein the attenuator comprises: a first capacitor having one end connected in parallel to the rectifier output; A first resistor connected in parallel with the first capacitor; A reactor having one end connected to the minus side of the rectifier input and the other end connected to the other end of the first capacitor; A second capacitor having one end connected to the other end of the first capacitor and the other end connected to a minus side of the rectifier output; And a second resistor connected in parallel with the second capacitor.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-12-02|Application filed by 이형도, 삼성전기 주식회사
    1997-12-02|Priority to KR1019970065154A
    1999-07-05|Publication of KR19990046971A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970065154A|KR19990046971A|1997-12-02|1997-12-02|Switching mode power supply circuit|
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