D-class power amplifier with electric power regeneration function
First Claim
1. A D-class power amplifier for supplying an amplification signal obtained by amplifying two input signals to two loads which are mutually connected at one end of each load, comprising:
- two D-class power amplifying circuits having output terminals connected to the other ends of said two loads, respectively;
a preprocessing circuit for performing a predetermined preprocess to said two input signals and supplying the processed signals to said two D-class power amplifying circuits; and
a power supply circuit for supplying an electric power to said two D-class power amplifying circuits, wherein one of said two D-class power amplifying circuits executes an anti-phase power amplifying process and the other of said two D-class power amplifying circuits executes an in-phase power amplifying process, said preprocessing circuit executes a process for equalizing amplitudes of the two input signals in a low frequency band, and a node of said two loads is connected to a neutral potential point of an output voltage from said power supply circuit.
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Accused Products
Abstract
A D-class power amplifier of two channels in which an increase in power voltage due to a regenerative current is prevented and a high efficiency in utilization of electric power is attained. Two D-class power amplifying circuits included in the D-class power aymplifier of the two channels are constructed by opposite phases. A preprocess is performed only to low frequency components of input signals so that they have a substantially equal amplitude in the two channels, and the resultant low frequency components are supplied to the D-class power amplifying circuits, respectively. The other ends of loads connected to the D-class power amplifying circuits are connected to a neutral potential point of the power voltage.
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4 Claims
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1. A D-class power amplifier for supplying an amplification signal obtained by amplifying two input signals to two loads which are mutually connected at one end of each load, comprising:
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two D-class power amplifying circuits having output terminals connected to the other ends of said two loads, respectively;
a preprocessing circuit for performing a predetermined preprocess to said two input signals and supplying the processed signals to said two D-class power amplifying circuits; and
a power supply circuit for supplying an electric power to said two D-class power amplifying circuits, wherein one of said two D-class power amplifying circuits executes an anti-phase power amplifying process and the other of said two D-class power amplifying circuits executes an in-phase power amplifying process, said preprocessing circuit executes a process for equalizing amplitudes of the two input signals in a low frequency band, and a node of said two loads is connected to a neutral potential point of an output voltage from said power supply circuit. - View Dependent Claims (2, 3, 4)
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Specification