EP 0224227 B1 19890503 - PHASE CHOPPING CONTROL FOR OPERATING A RESISTIVE CHARGE CONNECTED TO AN AC NETWORK
Title (en)
PHASE CHOPPING CONTROL FOR OPERATING A RESISTIVE CHARGE CONNECTED TO AN AC NETWORK
Publication
Application
Priority
DE 3541771 A 19851126
Abstract (en)
[origin: EP0224227A2] 1. A phase-chopping control unit for the operation of a resistive load connected to an a.c. mains voltage, comprising a triac (Tr) connected in series with the resistive load (Ro), an RC element connected in parallel to the triac (Tr), and consisting of a capacitor (C) and a resistance chain (R) formed by at least two series-connected resistors (R1, R2), and a diac (DT) connected between the junction point of the capacitor (C) to the resistance chain (R), and to the grid of the triac (Tr), characterized in that the timer which is formed by the capacitor (C) and the adjacent resistor (R1) is connected in parallel to a compensating element (K) which has a voltage characteristic which is opposed to that of the capacitor (C) of the timer, where the compensating element (K) is directly connected to the a.c. mains voltage via a series-connected circuit (Z) which determines the impedance.
IPC 1-7
IPC 8 full level
H02M 5/257 (2006.01); H05B 39/08 (2006.01)
CPC (source: EP)
H05B 39/083 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0224227 A2 19870603; EP 0224227 A3 19871014; EP 0224227 B1 19890503; DE 3541771 A1 19870527; DE 3663217 D1 19890608
DOCDB simple family (application)
EP 86116222 A 19861122; DE 3541771 A 19851126; DE 3663217 T 19861122