EP 1943718 A1 20080716 - SWITCHING CONTROL CIRCUIT FOR PRIMARY-SIDE CONTROLLED POWER CONVERTERS
Title (en)
SWITCHING CONTROL CIRCUIT FOR PRIMARY-SIDE CONTROLLED POWER CONVERTERS
Title (de)
STEUERSCHALTUNG FÜR PRIMÄRSEITIG GESTEUERTE LEISTUNGSWANDLER
Title (fr)
CIRCUIT DE COMMANDE DE COMMUTATION DE CONVERTISSEURS DE PUISSANCE COMMANDÉE DU CÔTÉ PRIMAIRE
Publication
Application
Priority
CN 2005001652 W 20051009
Abstract (en)
[origin: WO2007041894A1] The present invention discloses a switching control circuit for a primary-side controlled power converter. A voltage-waveform detector produces a voltage-feedback signal and a discharge-time signal. A current-waveform detector generates a current-waveform signal by measuring a primary-side switching current. An integrator generates a current-feedback signal by integrating the current-waveform signal with the discharge time. A time constant of the integrator is correlated with the switching frequency, thus the current-feedback signal is proportional to an output current of the power converter. A PWM circuit controls the pulse width of the switching signal in response to the outputs of a voltage-loop error amplifier and a current-loop error amplifier. The output voltage and the maximum output current of the power converter are therefore regulated.
IPC 8 full level
H02M 3/335 (2006.01)
CPC (source: EP KR)
H02M 3/22 (2013.01 - KR); H02M 3/28 (2013.01 - KR); H02M 3/33507 (2013.01 - EP); H02M 3/33523 (2013.01 - EP)
Designated contracting state (EPC)
DE NL
DOCDB simple family (publication)
WO 2007041894 A1 20070419; EP 1943718 A1 20080716; EP 1943718 A4 20111012; JP 2009512404 A 20090319; JP 4724229 B2 20110713; KR 100982169 B1 20100915; KR 20080066001 A 20080715
DOCDB simple family (application)
CN 2005001652 W 20051009; EP 05795427 A 20051009; JP 2008533846 A 20051009; KR 20087010387 A 20051009