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TW200634466A - A switching control circuit for controlling output current at the primary side of a power converter - Google Patents

A switching control circuit for controlling output current at the primary side of a power converter

Info

Publication number
TW200634466A
TW200634466A TW094109676A TW94109676A TW200634466A TW 200634466 A TW200634466 A TW 200634466A TW 094109676 A TW094109676 A TW 094109676A TW 94109676 A TW94109676 A TW 94109676A TW 200634466 A TW200634466 A TW 200634466A
Authority
TW
Taiwan
Prior art keywords
signal
switching
current
output current
power converter
Prior art date
Application number
TW094109676A
Other languages
Chinese (zh)
Other versions
TWI277852B (en
Inventor
Ta-Yung Yang
Guo-Kiang Hung
Original Assignee
System General Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by System General Corp filed Critical System General Corp
Priority to TW94109676A priority Critical patent/TWI277852B/en
Publication of TW200634466A publication Critical patent/TW200634466A/en
Application granted granted Critical
Publication of TWI277852B publication Critical patent/TWI277852B/en

Links

Landscapes

  • Dc-Dc Converters (AREA)

Abstract

A switching control circuit controlling output current at the primary side of a power converter is provided. A waveform detector generates a current-waveform signal. A discharge-time detector detects a discharge-time of a secondary side switching current. An oscillator generates an oscillation signal for determining the switching frequency of the switching signal. An integrator generates an integrated signal by integrating an average current signal with the discharge-time. The average current signal is generated in response to the current-waveform signal. The time constant of the integrator is correlated with the switching period of the switching signal, therefore the integrated signal is proportional to the output current. An error amplifier amplifies the integrated signal and provides a loop gain for output current control. A comparator controls the pulse width of the switching signal in reference to the output of the error amplifier. Therefore, the output current of the power converter can be regulated.
TW94109676A 2005-03-28 2005-03-28 A switching control circuit for controlling output current at the primary side of a power converter TWI277852B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW94109676A TWI277852B (en) 2005-03-28 2005-03-28 A switching control circuit for controlling output current at the primary side of a power converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW94109676A TWI277852B (en) 2005-03-28 2005-03-28 A switching control circuit for controlling output current at the primary side of a power converter

Publications (2)

Publication Number Publication Date
TW200634466A true TW200634466A (en) 2006-10-01
TWI277852B TWI277852B (en) 2007-04-01

Family

ID=38626060

Family Applications (1)

Application Number Title Priority Date Filing Date
TW94109676A TWI277852B (en) 2005-03-28 2005-03-28 A switching control circuit for controlling output current at the primary side of a power converter

Country Status (1)

Country Link
TW (1) TWI277852B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI678605B (en) * 2018-12-21 2019-12-01 宏碁股份有限公司 Power adaptor
TWI767531B (en) * 2020-12-11 2022-06-11 大陸商艾科微電子（深圳）有限公司 Constant-current control device and related control method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8742677B2 (en) 2010-01-11 2014-06-03 System General Corp. LED drive circuit with a programmable input for LED lighting
TWI379496B (en) 2010-04-02 2012-12-11 Macroblock Inc Isolated primary side regulator
TWI454007B (en) * 2011-01-11 2014-09-21 System General Corp Power supply with open-loop and short-circuit protection

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI678605B (en) * 2018-12-21 2019-12-01 宏碁股份有限公司 Power adaptor
TWI767531B (en) * 2020-12-11 2022-06-11 大陸商艾科微電子（深圳）有限公司 Constant-current control device and related control method
US11742742B2 (en) 2020-12-11 2023-08-29 Ark Semiconductor Corp. Ltd. Constant-current control device and related control method

Also Published As

Publication number Publication date
TWI277852B (en) 2007-04-01

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