WO2019196318A1 - 一种开关电源 - Google Patents
一种开关电源 Download PDFInfo
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- WO2019196318A1 WO2019196318A1 PCT/CN2018/103249 CN2018103249W WO2019196318A1 WO 2019196318 A1 WO2019196318 A1 WO 2019196318A1 CN 2018103249 W CN2018103249 W CN 2018103249W WO 2019196318 A1 WO2019196318 A1 WO 2019196318A1
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- WO
- WIPO (PCT)
- Prior art keywords
- power supply
- optocoupler
- feedback
- circuit
- optical coupler
- Prior art date
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
本发明提供一种开关电源,包括将输出电压VCC反馈到控制电路的隔离反馈环路,所述的隔离反馈环路包括光耦U1、限流电阻R1、分压电阻R2;所述的输出电压VCC通过限流电阻R1接光耦U1原边二极管正极,分压电阻R2的一端接光耦U1原边二极管正极,光耦U1原边二极管的负极和分压电阻R2的另一端接开关电源反馈电路的补偿和反馈控制端;光耦U1的副边三极管C极接控制电路的反馈信号输入端,光耦U1的副边三极管E极接副边地;还包括电容C1,所述的电容C1的两极分别接限流电阻R1的两端。本发明由于在开关电源的反馈电路中,光耦的分压电阻上设置有电容C1,使该开关电路的波特图相频特性和幅频特性得到明显的改善。
Description
发明名称:一种幵关电源
技术领域
[0001] 本发明涉及开关电源领域, 特别涉及一种波特图得到改善的开关电路。
背景技术
[0002] 波特图是线性时不变传递函数对频率的半对数座标图, 其横轴表示频率, 纵轴 表示幅度, 可以利用波特图可以看出系统的频率响应。 波德图一般是由二张图 组合而成, 一张幅频图, 表示频率响应增益的分贝值对频率的变化, 另一张相 频图, 是频率响应的相位对增益的变化。 开关电源行业通常测试波特图来判断 反馈电路的稳定性, 波特图的测试方法是在反馈电路中加入不同频率的干扰信 号, 来测试反馈电路的相频特性和幅频特性。
[0003] 目前, 如图 1所示的开关电源电路是一种 AC/DC电路, 将 AC电路经由整流电路 整流以后, 然后经过由控制电路控制的调频变换电路进彳了功率控制, 最后由调 频方波整流电路输出稳定的直流电, 所述的控制电路通过采集输出 DC信号与标 准信号进行比较生成 PWM信号控制调频变换电路, 形成反馈环路, 其中, 反馈 环路目前一般是一种隔离反馈电路。
[0004] 上述的开关电源电路, 波特图相频特性和幅频特性不能匹配用户的期望。
发明概述
技术问题
[0005] 本发明针对目前开关电源波特图相频特性和幅频特性不能匹配用户的期望的不 足, 提出一种开关电源电路, 该电路具有良好的波特图相频特性和幅频特性。 问题的解决方案
技术解决方案
[0006] 本发明为实现其技术目的所采用的技术方案是: 一种开关电源, 包括将输出电 压 VCC反馈到控制电路的隔离反馈环路, 所述的隔离反馈环路包括光耦 U1、 限 流电阻 R1、 分压电阻 R2; 所述的输出电压 VCC通过限流电阻 R1接光耦 U1原边二 极管正极, 分压电阻 R2的一端接光耦 U1原边二极管正极, 光耦 U1原边二极管的
负极和分压电阻 R2的另一端接开关电源反馈电路的补偿和反馈控制端; 光耦 U1 的副边三极管 C极接控制电路的反馈信号输入端, 光耦 U1的副边三极管 E极接副 边地; 还包括电容 C1, 所述的电容 C1的两极分别接限流电阻 R1的两端。
[0007] 本发明由于在开关电源的反馈电路中, 光耦的分压电阻上设置有电容 C1, 使该 开关电路的波特图相频特性和幅频特性得到明显的改善。
[0008] 进一步的, 上述的开关电源电路中: 在所述的控制电路中, 还包括 PWM/PFM 芯片, 所述的光耦 U1的副边三极管 C极接 PWM/PFM芯片的反馈脚。
发明的有益效果
对附图的简要说明
附图说明
[0009] 图 1是目前开关电路原理框图。
[0010] 图 2是本发明实施例 1中开关电源电路的隔离反馈电路原理图。
[0011] 图 3是目前开关电路的波特图。
[0012] 图 4是本发明实施例 1开关电路的波特图。
发明实施例
本发明的实施方式
[0013] 实施例 1, 如图 2所示是本实施例开关电源的隔离反馈电路, 如图 1所示, 这个 隔离反馈电路为一个隔离反馈环路, 包括光耦 U1、 限流电阻 R1、 分压电阻 R2; 输出电压 VCC通过限流电阻 R1接光耦 U1原边二极管正极, 分压电阻 R2的一端接 光耦 U1原边二极管正极, 光耦 U1原边二极管的负极和分压电阻 R2的另一端接开 关电源反馈电路的补偿和反馈控制端; 光耦 U1的副边三极管 C极接控制电路的反 馈信号输入端, 光耦 U1的副边三极管 E极接副边地; 还包括电容 C1, 所述的电 容 C1的两极分别接限流电阻 R1的两端。
[0014] 本实施例中, 在正常工作的时候电容 C1直流阻抗接近无穷大, 不消耗能量。 当 测试波特图的时候在开关电源副边输出电压 VCC端与输出反馈端注入的小信号 是变化的频率信号, 没有加上电容 C1的时候由于限流电阻 R1是固定电阻, 开关 电源输出电压 VCC端有变化的频率信号时通过光耦 U1原边二极管的电流是一样
的, 而加入电容 Cl以后, 对应开关电源输出电压 VCC端有不同频率信号时, 电 容 C1的容抗会发生变化, 从而引起光耦 U1的原边二极管电流发生变化, 从而引 起光耦 U1副边三极管的快速导通, 控制 PWM/PFM芯片的脉冲宽度或者频率变化 从而达到环路的快速响应, 并提升开关电源隔离反馈电路的波特图裕量。
[0015] 如图 3所示是目前一般的开关电源的波特图, 由图 3可知: 增益的过零点 10.293 KHZ, 相位裕量 31.8度湘位的过零点为 17.31KHZ, 增益裕量为 -3.92DB。
[0016] 如图 4所示是本实施例的开关电源的波特图, 由图 4可知: 增益的过零点 2.50KH Z, 相位裕量 72度;相位的过零点为 10.834KHZ, 增益裕量为 -12.63DB。
[0017] 由此可知: 从实际的测试结果可以看到本实施例的相位线和增益线比目前的开 关电源电路波特图中的过零点提前了, 裕量也增加了。
Claims
[权利要求 1] 一种开关电源, 包括将输出电压 VCC反馈到控制电路的隔离反馈环路 , 所述的隔离反馈环路包括光耦 U1、 限流电阻 R1、 分压电阻 R2; 所 述的输出电压 VCC通过限流电阻 R1接光耦 U1原边二极管正极, 分压 电阻 R2的一端接光耦 U1原边二极管正极, 光耦 U1原边二极管的负极 和分压电阻 R2的另一端接开关电源反馈电路的补偿和反馈控制端; 光耦 U1的副边三极管 C极接控制电路的反馈信号输入端, 光耦 U1的 副边三极管 E极接副边地; 其特征在于: 还包括电容 C1, 所述的电容 C1的两极分别接限流电阻 R1的两端。
[权利要求 2] 根据权利要求 1所述的开关电源电路, 其特征在于: 在所述的控制电 路中, 还包括 PWM/PFM芯片, 所述的光耦 U1的副边三极管 C极接 PW M/PFM芯片的反馈脚。
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CN201810319042.X | 2018-04-11 | ||
CN201810319042.XA CN108494260A (zh) | 2018-04-11 | 2018-04-11 | 一种软开关电路 |
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CN108494227A (zh) * | 2018-04-17 | 2018-09-04 | 深圳市金威源科技股份有限公司 | 一种开关电源 |
CN110707931A (zh) * | 2019-09-06 | 2020-01-17 | 广州金升阳科技有限公司 | 一种llc谐振变换器及控制方法 |
Citations (5)
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JPH02211980A (ja) * | 1989-02-13 | 1990-08-23 | Matsushita Electric Ind Co Ltd | 溶接機の信号伝送回路 |
CN104038046A (zh) * | 2014-05-15 | 2014-09-10 | 青岛海信宽带多媒体技术有限公司 | 一种频率抖动电路和开关电源 |
CN104376669A (zh) * | 2014-11-25 | 2015-02-25 | 湖北鼎汉投资有限公司 | 高频容抗式电缆线无线防盗报警器 |
CN204681253U (zh) * | 2015-06-15 | 2015-09-30 | 深圳市捷扬讯科电子有限公司 | 一种供电系统及led电源 |
CN108494227A (zh) * | 2018-04-17 | 2018-09-04 | 深圳市金威源科技股份有限公司 | 一种开关电源 |
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CN2431675Y (zh) * | 1999-04-09 | 2001-05-23 | 深圳市中兴通讯股份有限公司 | 宽负载范围零压零流开关电源变换器 |
CN203617878U (zh) * | 2013-07-04 | 2014-05-28 | 深圳市威纳源电子有限公司 | 一种固定导通时间的谐振软开关 |
CN106887945A (zh) * | 2017-04-10 | 2017-06-23 | 东莞理工学院 | 单级谐振式隔离软开关升压功率因数校正电路及校正方法 |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02211980A (ja) * | 1989-02-13 | 1990-08-23 | Matsushita Electric Ind Co Ltd | 溶接機の信号伝送回路 |
CN104038046A (zh) * | 2014-05-15 | 2014-09-10 | 青岛海信宽带多媒体技术有限公司 | 一种频率抖动电路和开关电源 |
CN104376669A (zh) * | 2014-11-25 | 2015-02-25 | 湖北鼎汉投资有限公司 | 高频容抗式电缆线无线防盗报警器 |
CN204681253U (zh) * | 2015-06-15 | 2015-09-30 | 深圳市捷扬讯科电子有限公司 | 一种供电系统及led电源 |
CN108494227A (zh) * | 2018-04-17 | 2018-09-04 | 深圳市金威源科技股份有限公司 | 一种开关电源 |
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