Single-stage high-voltage DC LED switching power supply

Abstract

The invention provides a single-stage high-voltage DC LED switching power supply comprising a main circuit and a control circuit. The main circuit comprises an HVDC input EMC unit, a non-isolating step-down switch circuit unit, an output EMC unit, a signal acquisition unit, a switch signal driving unit, and a first primary signal interface unit. The control circuit comprises a standby power supplyunit, a digital power controller unit, a signal isolation unit, a primary signal conditioning unit, a secondary signal conditioning unit, a communication programming interface unit, a second primarysignal interface unit, and a secondary signal interface unit. In the main circuit, an existing active flyback clamp method is improved to the flyback buck step-down circuit to improve the power conversion power. In the control circuit, an existing control module circuit is integrated with the standby power supply unit and the primary and secondary signal isolation coupling circuits. According to the invention, the power conversion efficiency is improved by limiting the implementation cost and complexity of the circuit.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a single-stage high-voltage direct-current power supply LED switching power supply. Background technique [0002] Switching power supply is developed from linear regulated power supply, and with the rapid development of technology, it has been widely popularized as a common product in life. [0003] As a high-efficiency isolated LED switching power supply, the existing mainstream scheme adopts a single-stage switching power supply scheme, and its switching circuit adopts a single-stage switching power supply scheme. The topology of its switching circuit adopts a flyback switching power supply circuit to obtain the most The cost performance is good, but the power conversion efficiency is low. The root cause is that there is a fixed power consumption in the clamping circuit part of the switching circuit, and the power consumption of this part will double with the increase of...

AI Technical Summary

Problems solved by technology

[0003] As a high-efficiency isolated LED switching power supply, the existing mainstream scheme adopts a single-stage switching power supply scheme, and its switching circuit adopts a single-stage switching power supply scheme, and the topology of its switching circuit adopts a flyback switching power supply circuit to obtain the most Good cost performance, but the power conversion efficiency is low. The root cause is that there is a fixed power consumption in the clamping circuit part of the switching circuit, and the power consumption of this part will double with the increase of the power supply.

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