Direct current step-up circuit for use with battery powered equipment

A direct current step-up circuit for a battery-powered device comprising:

• first and second input terminals for connection to a battery;
• first and second output terminals for connection to the device;
• and
• a DC/DC converter having first and second converter input terminals connected respectively to the first and second input terminals of the step-up circuit, and having a first and second output terminals;
• the second output terminal of the step-up circuit is connected to the second input terminal of the step-up circuit, the second output terminal of the DC/DC converter is connected to the first input terminal of the step-up circuit, and the first output terminal of the DC/DC converter is connected to the first output terminal on the step-up circuit, whereby an output of the step-up circuit is the sum of an input of the step-up circuit and of an output of the DC/DC converter.

A direct current step-up circuit for a device powered by a battery, the circuit comprising:

• first and second input terminals for connection to the battery;
• first and second output terminals for connection to the device, the second output terminal being connected to the second input terminal;
• and
• a DC/DC converter having first and second converter input terminals connected respectively to the first and second input terminals of the step-up circuit, and having a first and second output terminals, the second output terminal of the DC/DC converter being connected to the first input terminal of the step-up circuit, and the first output terminal of the DC/DC converter being connected to the first output terminal on the step-up circuit.

A audio device powered by a battery, the device comprising:

• a speaker;
• an amplifier connected to the speaker;
• and
• a direct current step-up circuit for connection between the battery and the amplifier, the circuit including
• first and second input terminals for connection to the battery,
• first and second output terminals for connection to the amplifier, the second output terminal being connected to the second input terminal, and
• a DC/DC converter having first and second converter input terminals connected respectively to the first and second input terminals of the step-up circuit, and having a first and second output terminals, the second output terminal of the DC/DC converter being connected to the first input terminal of the step-up circuit, and the first output terminal of the DC/DC converter being connected to the first output terminal on the step-up circuit.