US 6,806,766 B2 · BTL amplifying system

Abstract

A BTL amplifying system is provided to prevent a load, such as a speaker, from being damaged. While power amplifying circuits of the BTL configuration are driving a load, a differential voltage detecting unit, a low-pass filter, and a control unit together detect and judge the occurrence of an offset. Upon detection and judgment of the occurrence of an offset, a driving operation of the load is stopped by allowing the power amplifying circuits to stop their own amplifying operations or inhibiting a signal to be amplified from being inputted to the power amplifying circuits. Consequently, even when an offset occurs while the load is driven due to the influence of use environments or due to deterioration with time of an electronic element incorporated as one of the components, it is possible to forestall offset-induced adverse affects or damage to the load.

Claims20

Dependent claims

A BTL amplifying system including two power amplifying circuits of a BTL configuration for driving a load, said system comprising:

a detecting device for detecting a change in output voltages to be supplied to said load from said respective power amplifying circuits;
and
a judging device for judging an occurrence of an offset from the change in said output voltages detected by said detecting device,
wherein said detecting device and said judging device continue detecting and judging operations while said power amplifying circuits are driving said load, and driving of said load by said power amplifying circuits is stopped when said judging device judges the occurrence of an offset.

1 more element

Dependencies are inferred from the claim text.

BTL amplifying system

Life of this patent

BTL amplifying system

Life of this patent

Abstract

Claims20