Switching power energy efficiency control circuit

A switching power supply circuit, switching power supply technology, applied in the direction of electrical program control, program control in sequence/logic controllers, etc., can solve the problem of high cost, achieve the effect of saving cost and speeding up the development cycle

Inactive Publication Date: 2013-12-04
SHENZHEN MAOHONG ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to propose a switching power sup

Method used

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  • Switching power energy efficiency control circuit
  • Switching power energy efficiency control circuit
  • Switching power energy efficiency control circuit

Examples

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Embodiment Construction

[0031] Below, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0032] Such as figure 1 As shown, this embodiment can be applied to audio power amplifiers. The energy efficiency control circuit 1 controls the working state of the switching power supply circuit 2 according to the presence or absence of the audio signal 100, and the switching power supply circuit 2 is used to drive the audio power amplifier 3 to work, so that the audio power amplifier 3 processes the audio signal 100 to play music . It should be noted that the switching power supply circuit 2 of this embodiment is an ordinary switching power supply chip, which does not have a green function, and the audio power amplifier 3 is also an ordinary audio power amplifier without a standby function.

[0033] Such as figure 2 As shown, a switching power supply energy efficiency control circuit of this embodiment includes a switching power supply ...

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Abstract

The invention relates to a switching power energy efficiency control circuit comprising a switching power circuit, an awakening circuit and a holding circuit. The switching power circuit is used for providing working voltage to the holding circuit in working condition. The awakening circuit is used for driving a switching circuit to be switched on in stand-by condition after receiving sound signals so as to enable a supply circuit to provide working voltage to a PWM (pulse width modulation) controller via the switching circuit. The holding circuit is used for driving the switching circuit to be switched on continuously in working condition after receiving concessive sound signals, and driving the switching circuit to be switched off after the sound signals can not be received in a preset time, so that the supply circuit can not provide working voltage to the PWM controller through the switching circuit. With the switching power energy efficiency control circuit, sound signals can be detected, normal switching power can be controlled directly, automatically stand-by and automatic awakening functions can be realized, and stand-by energy consumption can be maintained at a low level.

Description

[0001] technical field [0002] The invention relates to an energy efficiency control circuit, in particular to a switching power supply energy efficiency control circuit. [0003] Background technique [0004] The implementation of energy efficiency standards (such as ErP) puts forward new requirements for the design of audio power amplifiers. ErP requires that the audio power amplifier can automatically enter the standby state after a certain period of time when it is not in use, and the power consumption at this time is required to be less than a certain standard (such as 0.5W). In order to meet this requirement, the most common method is to use a switching power supply that meets the green standard, and a power amplifier chip with a standby function. However, such a solution greatly increases the cost of the product and requires the introduction of a large number of new materials, which poses a greater challenge to upgrading the existing product line. [0005] Conte...

Claims

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Application Information

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IPC IPC(8): G05B19/04
Inventor 刘晓刚
Owner SHENZHEN MAOHONG ELECTRIC
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