TW200608684A - Switching control circuit with variable switching frequency for primary-side-controlled power converters - Google Patents

Switching control circuit with variable switching frequency for primary-side-controlled power converters

Info

Publication number
TW200608684A
TW200608684A TW093125951A TW93125951A TW200608684A TW 200608684 A TW200608684 A TW 200608684A TW 093125951 A TW093125951 A TW 093125951A TW 93125951 A TW93125951 A TW 93125951A TW 200608684 A TW200608684 A TW 200608684A
Authority
TW
Taiwan
Prior art keywords
signal
current
switching
voltage
time
Prior art date
Application number
TW093125951A
Other languages
Chinese (zh)
Other versions
TWI251979B (en
Inventor
Ta-Yung Yang
Guo-Kiang Hung
Jenn-Yu G Lin
Feng-Cheng Tsao
Shao-Wei Chiu
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 TW93125951A priority Critical patent/TWI251979B/en
Publication of TW200608684A publication Critical patent/TW200608684A/en
Application granted granted Critical
Publication of TWI251979B publication Critical patent/TWI251979B/en

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  • Dc-Dc Converters (AREA)

Abstract

The invention presents a switching control circuit for a primary-side controlled power converter. A pattern generator produces digital patterns. An oscillator having a programmable capacitor determines the switching frequency in response to the digital pattern, which produces a frequency hopping to reduce the EMI of the power converter. A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal by multiply sampling a voltage signal of a transformer. The discharge-time signal represents the discharge-time of a secondary-side switching current. A current-waveform detector and an integrator generate a current-feedback signal by integrating an average-current signal with the discharge-time. Integrating a current-waveform signal with a timing signal generates the average-current signal. Time constants of the integrator are correlated to the switching frequency of the switching signal. A voltage-loop error amplifier and a current-loop error amplifier amplify the voltage-feedback signal and the current-feedback signal. An oscillator correspondingly generates the timing signal and a pulse signal in response to the output of the current-loop error amplifier. The pulse signal determines the switching frequency of a switching signal. A PWM circuit generates the switching signal in response to the pulse signal and the output of the voltage-loop error amplifier for switching the switching device and regulating the outputs of the power converter.
TW93125951A 2004-08-27 2004-08-27 Switching control circuit with variable switching frequency for primary-side-controlled power converters TWI251979B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW93125951A TWI251979B (en) 2004-08-27 2004-08-27 Switching control circuit with variable switching frequency for primary-side-controlled power converters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW93125951A TWI251979B (en) 2004-08-27 2004-08-27 Switching control circuit with variable switching frequency for primary-side-controlled power converters

Publications (2)

Publication Number Publication Date
TW200608684A true TW200608684A (en) 2006-03-01
TWI251979B TWI251979B (en) 2006-03-21

Family

ID=37453843

Family Applications (1)

Application Number Title Priority Date Filing Date
TW93125951A TWI251979B (en) 2004-08-27 2004-08-27 Switching control circuit with variable switching frequency for primary-side-controlled power converters

Country Status (1)

Country Link
TW (1) TWI251979B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104283430A (en) * 2013-07-05 2015-01-14 立锜科技股份有限公司 Soft start switching power supply conversion device

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8767419B2 (en) * 2009-12-04 2014-07-01 System General Corp. Feedback circuit with feedback impedance modulation for improving power saving
TWI411202B (en) * 2010-12-20 2013-10-01 Richtek Technology Corp Controller for power converter and method for controlling power converter
US9344002B2 (en) * 2012-01-17 2016-05-17 System General Corp. Adaptive sampling circuit for detecting the demagnetized voltage of the transformer
TWI470912B (en) 2012-06-08 2015-01-21 Power Forest Technology Corp Power factor correction (pfc) power conversion apparatus and power conversion method thereof
TWI584569B (en) * 2014-01-23 2017-05-21 群光電能科技股份有限公司 Power supply apparatus with variable switching frequency
US9312784B2 (en) 2014-03-13 2016-04-12 Chicony Power Technology Co., Ltd. Variable switching frequency power supply apparatus
EP4205272A4 (en) * 2020-08-25 2024-05-29 Astec International Limited Bulk capacitor heating circuits in electrical power converters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104283430A (en) * 2013-07-05 2015-01-14 立锜科技股份有限公司 Soft start switching power supply conversion device
CN104283430B (en) * 2013-07-05 2016-12-28 立锜科技股份有限公司 Soft start switching power supply conversion device

Also Published As

Publication number Publication date
TWI251979B (en) 2006-03-21

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