Switch power for sound box power amplification system

Abstract

The present invention provides a switching power supply used for sound speaker, characterized in that the switching power supply includes an input circuit, a transform circuit, an output circuit, a detection circuit, a protection circuit, a control circuit, a power detection circuit and an auxiliary power supply; the output end of the input circuit is connected with the ends which are connected with the output circuit in orders by the transform circuit, and connected with the input end of the power detection circuit, the input end of the detection circuit and the input end of the protection circuit; the output end of the detection circuit, the output end of the power detection circuit and the output end of the protection circuit are connected with a signal input end of the control circuit respectively, the output end of the control circuit is connected with the control signal input end of the transform circuit, the input end of the detection circuit is connected to the output end of the output circuit after connected with the input end of the protection circuit; the output ends of the auxiliary power supply are connected to the power input end of the control circuit and the power detection circuit respectively. The invention automatically adjusts the output voltage by the change of the load, automatically reducing the inner loss, having lower power consumption, high credibility, lower cost, easier market promotion.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a switching power supply for an audio amplifier system. It belongs to the technical field of audio switching power supply. Background technique [0002] Switching power supply gets its name because the device in the power supply that adjusts the voltage regulation control function always works in a switching mode. It is a power supply that uses modern power electronics technology to maintain a stable output voltage by controlling the on-off time ratio of the switch tube. Because of its excellent characteristics such as small size, light weight, low power consumption, high efficiency, small ripple, low noise, high degree of intelligence, and easy expansion, it is widely used in various electronic devices. Most audio power amplifier systems on the market now use power frequency transformers. As the price of raw materials (mainly copper) continues to rise, the cost advantage of traditi...

AI Technical Summary

Problems solved by technology

If the ordinary switching power supply is applied to the audio power amplifier system, it will bring the following problems: 1. The output voltage of the switching power supply will not change dynamically with the load change, and cannot meet the dynamic response requirements of the audio power amplifier system

2. When the output power is too large, the internal loss of the audio power amplifier system is very large, and the circuit power device overheats or even burns the circuit

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