CN107659156A - 一种谷底检测电路 - Google Patents

一种谷底检测电路 Download PDF

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Publication number
CN107659156A
CN107659156A CN201710955989.5A CN201710955989A CN107659156A CN 107659156 A CN107659156 A CN 107659156A CN 201710955989 A CN201710955989 A CN 201710955989A CN 107659156 A CN107659156 A CN 107659156A
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Changsha Party Xingteng Electronic Technology Co Ltd
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Changsha Party Xingteng Electronic Technology Co Ltd
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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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion 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
    • H02M3/325Conversion 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
    • H02M3/335Conversion 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
    • H02M3/33507Conversion 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
    • H02M3/33523Conversion 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/175Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

一种谷底检测电路,属于半导体集成电路技术领域。包括:依次连接的微分电路、模数转换电路、数字信号处理电路,微分电路对谐振信号进行微分处理,将谐振信号谷底之前的数据变为负数,谷底之后的数据变成正数,谷底点变为0;微分处理过后的模拟数据送入模数转换电路,模数转换电路把模拟数据转换成数字数据,可以将谐振信号微分后的数据,从负数到0再到正数的整个过程,完整的反映出来,然后送入数字信号处理电路,通过数字信号处理电路处理后,就可以得到接近谷底、到达谷底和走出谷底的整个过程,精确的跟踪到整个谐振信号在谷底附近的一切波形,为进入谷底之后的整个反激式变换器的行为提前做好准备,即可检测到谐振信号的精确的谷底。

Description

一种谷底检测电路
技术领域
本发明属于半导体集成电路技术领域,具体涉及一种谷底检测电路。
背景技术
由于反激式变换器结构简单、成本低,非常适合作为大型电子设备的辅助电源和消费电子产品的电源,所以得到了广泛的应用。反激式变换器工作时,开关管导通后,变压器原边电流逐渐增加,变压器的磁芯储能也逐渐增加。当开关管关断后,变压器储能被耦合到副边,整流二极管导通,变压器储能输出给负载。变压器储能全部输出后,副边整流二极管关断,变压器励磁电感与原边寄生电容及耦合到原边的副边寄生电容发生串联谐振。准谐振反激变压器中的MOS管都在谐振电压的谷底导通。因此明显改善了反激电源的电磁干扰问题,并减低了MOS管的开通损耗。因此,谷底检测电路也越来越受到人们的重视,应用范围也越来越广泛。
传统的谷底检测电路都采用RC延时的方式实现,即检测到谐振电压降低某一固定电压后,认为其经过一设定RC延时后就是谷底。这种传统的检测方法在某一特定的反激式变换器系统中是完全可行的。但是一旦调整了反激式变换器的系统,则这个电路将完全失效。所以,传统的谷底检测电路只能在特定的应用场合下使用,不具有普遍性。
发明内容
为解决现有的谷底检测电路只能在特定的应用场合下使用的技术问题,本发明提供了一种谷底检测电路。
一种谷底检测电路,包括:微分电路、模数转换电路和数字信号处理电路;微分电路连接模数转换电路,模数转换电路连接数字信号处理电路,微分电路对谐振信号进行微分处理,微分处理过后的模拟数据送入模数转换电路,模数转换电路把模拟数据转换成数字数据后,送入数字信号处理电路,通过数字信号处理电路处理后,就检测到谐振信号的精确的谷底。
本发明中,微分电路主要是将谐振信号谷底之前的数据变为负数,谷底之后的数据变成正数,谷底点变为0;而模数转换器的作用,在于经过模数转换后,可以将谐振信号微分后的数据,从负数到0再到正数的整个过程,完整的反映出来,经过数字信号处理电路后,就可以得到接近谷底、到达谷底和走出谷底的整个过程,精确的跟踪到整个谐振信号在谷底附近的一切波形,为进入谷底之后的整个反激式变换器的行为提前做好准备。
附图说明
图1是本发明的谷底检测电路的结构示意图;
具体实施方式
为使本发明的目的、技术方案和优点更加清楚明了,下面结合具体实施方式并参照附图,对本发明进一步详细说明。应该理解,这些描述只是示例性的,而并非要限制本发明的范围。此外,在以下说明中,省略了对公知结构和技术的描述,以避免不必要地混淆本发明的概念。
如图1所示,为本发明提供的一种谷底检测电路,包括:微分电路1、模数转换电路2和数字信号处理电路3;微分电路1连接模数转换电路2,模数转换电路2连接数字信号处理电路3,微分电路1对谐振信号进行微分处理,微分处理过后的模拟数据送入模数转换电路2,模数转换电路2把模拟数据转换成数字数据后,送入数字信号处理电路3,通过数字信号处理电路3处理后,就检测到谐振信号的精确的谷底。
上述模数转换器,可以是流水线型模数转换器。
本发明中,微分电路主要是将谐振信号谷底之前的数据变为负数,谷底之后的数据变成正数,谷底点变为0;而模数转换器的作用,在于经过模数转换后,可以将谐振信号微分后的数据,从负数到0再到正数的整个过程,完整的反映出来,经过数字信号处理电路后,就可以得到接近谷底、到达谷底和走出谷底的整个过程,精确的跟踪到整个谐振信号在谷底附近的一切波形,为进入谷底之后的整个反激式变换器的行为提前做好准备。
应当理解的是,本发明的上述具体实施方式仅仅用于示例性说明或解释本发明的原理,而不构成对本发明的限制。因此,在不偏离本发明的精神和范围的情况下所做的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。此外,本发明所附权利要求旨在涵盖落入所附权利要求范围和边界、或者这种范围和边界的等同形式内的全部变化和修改例。

Claims (1)

1.一种谷底检测电路,其特征在于,包括:微分电路、模数转换电路和数字信号处理电路;微分电路连接模数转换电路,模数转换电路连接数字信号处理电路,微分电路对谐振信号进行微分处理,微分处理过后的模拟数据送入模数转换电路,模数转换电路把模拟数据转换成数字数据后,送入数字信号处理电路,通过数字信号处理电路处理后,就检测到谐振信号的精确的谷底。
CN201710955989.5A 2017-10-15 2017-10-15 一种谷底检测电路 Withdrawn CN107659156A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109001523A (zh) * 2018-08-02 2018-12-14 西安鼎芯微电子有限公司 交流变直流转换器的波谷检测装置
CN112564491A (zh) * 2020-11-16 2021-03-26 上海翰迈电子科技有限公司 谷底检测方法、控制芯片及反激变换器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104167948A (zh) * 2014-09-11 2014-11-26 上海理工大学 一种微型光伏并网逆变器的变频软开关控制方法
TW201525472A (zh) * 2013-12-19 2015-07-01 Inst Information Industry 頻率檢測裝置及頻率檢測方法
TW201640952A (zh) * 2015-03-16 2016-11-16 On Bright Electronics Shanghai 用於電磁爐過流保護的控制電路和控制方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201525472A (zh) * 2013-12-19 2015-07-01 Inst Information Industry 頻率檢測裝置及頻率檢測方法
CN104167948A (zh) * 2014-09-11 2014-11-26 上海理工大学 一种微型光伏并网逆变器的变频软开关控制方法
TW201640952A (zh) * 2015-03-16 2016-11-16 On Bright Electronics Shanghai 用於電磁爐過流保護的控制電路和控制方法

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王亮、张波、丘东元: "MOSFET漏源电压谷底时刻微分检测", 《第三届中国高校电力电子与电力传动学术年会》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109001523A (zh) * 2018-08-02 2018-12-14 西安鼎芯微电子有限公司 交流变直流转换器的波谷检测装置
CN112564491A (zh) * 2020-11-16 2021-03-26 上海翰迈电子科技有限公司 谷底检测方法、控制芯片及反激变换器
CN112564491B (zh) * 2020-11-16 2022-06-03 上海翰迈电子科技有限公司 谷底检测方法、控制芯片及反激变换器

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Application publication date: 20180202