System and method for reduction in power supply rail pumping in class D audio amplifiers using dual regulated DC-DC converters
AssigneeHarman Professional, Inc.
InventorsAbhiman Ananthakrishna Hande, Mark Edward Sieber
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Abstract
An amplifier system may include at least one alternating current (AC) input source, a first DC-DC converter configured to convert the AC voltage to a first rail voltage, a second DC-DC converter configured convert the AC voltage to a second rail voltage, and a Class D amplifier configured to receive the first rail voltage on a first positive rail from the first DC-DC converter and the second rail voltage on a second negative rail from the second DC-DC converter to reduce rail pumping of the first and second voltage rails.
Claims13
An amplifier system, comprising:
- at least one alternating current (AC) input source;
- a first DC-DC converter configured to convert the AC voltage to a first rail voltage;
- a second DC-DC converter configured convert the AC voltage to a second rail voltage;
- a Class D amplifier configured to receive the first rail voltage on a first positive rail from the first DC-DC converter and the second rail voltage on a second negative rail from the second DC-DC converter to reduce rail pumping of the first and second voltage rails;
- and
- a power factor correction circuit configured to apply power factor correction to the AC input prior to DC/DC power conversion and application of DC power to the first and second DC-DC converters.
A Class D audio amplification system, comprising:
- at least one AC input source;
- a first DC-DC converter configured convert the AC voltage to regulate a positive voltage rail;
- a second DC-DC converter configured convert the AC voltage to regulate a negative voltage rail;
- and
- a Class D amplifier configured to receive the positive voltage rail from the first DC-DC converter and the negative voltage rail from the second DC-DC converter to reduce rail pumping of the Class D amplifier, wherein the Class D amplifier includes at least one voltage controlled oscillator (VCO).
An amplifier system, comprising:
- at least one alternating current (AC) input source;
- a first DC-DC converter configured to convert the AC voltage to a first rail voltage;
- a second DC-DC converter configured convert the AC voltage to a second rail voltage, wherein at least one of the first or second DC-DC converters is a dual active bridge converter;
- and
- a Class D amplifier configured to receive the first rail voltage on a first positive rail from the first DC-DC converter and the second rail voltage on a second negative rail from the second DC-DC converter to reduce rail pumping of the first and second voltage rails.
Dependencies are inferred from the claim text.