Controlled commutator circuit
AssigneesB & W Loudspeakers Limited, University of Brighton
InventorSteve Sevak Singh
Life of this patent
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Abstract
A commutator circuit includes a bridge (1), which may have a half-bridge or a full-bridge topology, and a switch resonant arm (3, L, C). The resonant arm is coupled to the midpoint of the bridge, directly, or via a current buffer, or via a transformer. The arm provide controlled resonant commutation of a load coupled to the midpoint of the bridge. The circuit may be used, for example to drive an electric servo motor, or in a digital audio power amplifier.
Claims23
An invertor circuit including a commutator bridge (1) having switches in each arm of the bridge and arranged to have a load (2) coupled to a mid-point of the bridge and a switched resonant arm (3) comprising a capacitor (C) and an inductor (L) also coupled to the mid-point of the bridge, characterised in that the commutator bridge is arranged to be switched into independent ones of only three switch states in a predetermined sequential and cyclical manner to provide controlled resonant commutation of the voltage of the mid-point of the bridge, in that said capacitor (C) and said inductor (L) are coupled in parallel, and in that the resonant arm is connected to a potential having a value of substantially V/2 where V is the drive potential across the bridge.
A circuit according to claim 15 including at least one resonant element (C;
- FIG. 10b) common to the at least two resonant arms.
A digital power amplifier including a commutator circuit, said commutator circuit comprising a commutator bridge (1) having switches (S1, S2:
- 54,55) in each arm of the bridge and arranged to have a load (2) coupled to a mid-point of the bridge and a switched resonant arm (3) comprising a capacitor (C) and an inductor (L) also coupled to the mid-point of the bridge, characterised in that the commutator bridge is arranged to be switched into independent ones of only three switch states in a predetermined sequential and cyclical manner to provide controlled resonant commutation of the voltage of the mid-point of the bridge and in that said capacitor (C) and said inductor (L) are coupled in parallel.
A drive circuit for an electric motor including a commutator circuit, said commutator circuit comprising a commutator bridge (1) having switches (S1, S2:
- 54,55) in each arm of the bridge and arranged to have a load (2) coupled to a mid-point of the bridge and a switched resonant arm (3) comprising a capacitor (C) and an inductor (L) also coupled to the mid-point of the bridge, characterised in that the commutator bridge is arranged to be switched into independent ones of only three switch states in a predetermined sequential and cyclical manner to provide controlled resonant commutation of the voltage of the mid-point of the bridge and in that said capacitor (C) and said inductor (L) are coupled in parallel.
Dependencies are inferred from the claim text.