Power supply circuit, method, audio power amplifier and integrated circuit
An audio power and power supply circuit technology, applied in amplifiers, improving amplifiers to reduce temperature/power supply voltage changes, improving amplifiers to improve efficiency, etc., to achieve self-adaptation, reduce conduction loss, and improve power supply efficiency.
Active Publication Date: 2022-02-15
WUHAN JUXIN MICROELECTRONICS CO LTD
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Problems solved by technology
[0003] However, in the related art, the power supply circuit of the audio power amplifier still needs to be optimized
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[0050] The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings and examples.
[0051]In the relevant technique, the output voltage (ie, the supply voltage) of the power supply circuit of the audio power amplifier is usually a constant voltage. In order to make the output power of the audio power amplifier satisfy some application scenarios, the output voltage of the power supply is usually a larger. Voltage. However, for some application scenarios that require the audio power amplifier to output smaller power, the power supply circuit is still powered by a larger voltage, which makes the current flowing on the power tube in the power supply circuit, resulting in power tube There is a large conduction loss; in addition, the output power of the audio power amplifier is small, and the power supply voltage supplied to the audio power amplifier is large, which will cause the driving loss of the audio power a...
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The invention discloses a power supply circuit, a method, an audio frequency power amplifier and an integrated circuit. Wherein, the power supply circuit is applied to an audio power amplifier, including: a detection sub-circuit, a control sub-circuit and a power supply sub-circuit; the detection sub-circuit is used to detect the output power of the audio power amplifier by detecting the first voltage ; The control subcircuit is used to determine the target reference voltage range corresponding to the first voltage in X reference voltage ranges, and determine the target code corresponding to the target reference voltage range; X is an integer greater than or equal to 2 ; Each reference voltage range in the X reference voltage ranges corresponds to a different code; the power supply circuit is used to generate a voltage that matches the output power of the audio power amplifier based on the target code, so as to provide the Audio power amplifier power supply.
Description
Technical field [0001] The present invention relates to the field of power amplifiers, in particular, to a power supply circuit, a method, an audio power amplifier, and an integrated circuit. Background technique [0002] The audio power amplifier is in the application process, and its output power is subject to its own power supply output voltage, which generally uses a boost type DC direct stream (English can be represented as a DC-DC) circuit or charge pump (English can be represented as Charge) -Pump) circuit as a power supply circuit of an audio power amplifier. The power supply circuit can increase the output signal of the output power by rising the supply voltage of the audio power amplifier to achieve the output of the audio power amplifier output signal. [0003] However, in the relevant technique, the power supply circuit of the audio power amplifier needs to be optimized. Inventive content [0004] In order to solve the related art problems, embodiments of the present...
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IPC IPC(8): H03F1/02H03F1/30H02M3/156
CPCH03F1/0211H03F1/30H02M3/156H03F1/0227H03F3/187H03F2200/03H03F3/2173H03F2200/78H03F2200/511H03F3/45475H03F3/217
Inventor 卢杰柯毅刘德珩马可铮
Owner WUHAN JUXIN MICROELECTRONICS CO LTD