A driving circuit for led lamp with improved pf value

Abstract

The invention discloses an LED lamp drive circuit for improving PF value, which includes a rectification module, a first isolation module, a second isolation module, a drive module, an auxiliary power supply module and an intelligent module, and the rectification module is isolated from the first isolation module and the second isolation module. The modules are connected, the first isolation module is connected to the drive module, the second isolation module is connected to the auxiliary power supply module, and the auxiliary power supply module is connected to the drive module through the intelligent module. In the present invention, an isolation module is provided, and the original filter circuit is divided into two parts and placed in the drive module and the auxiliary power supply module respectively, so that the rectification range is small, the operation is simple, and the rectification cost is low; at the same time, due to the existence of the isolation module, the drive module And the change of the auxiliary power supply module does not affect the change of the input circuit, so that the PF value of the whole circuit is improved.

Description

technical field [0001] The invention relates to the technical field of drive circuits, in particular to an LED lamp drive circuit with improved PF value. Background technique [0002] The PF value (power factor) refers to the ratio of the average power of the AC circuit to the apparent power. Under a certain voltage and power of the user's electrical equipment, the higher the value, the better the benefit, and the more fully the power generation equipment can be used. For a long time, the requirements for low-power electrical appliances and bulbs in lighting products have been relatively low, or even not required, so most circuit designs do not take into account the requirements for PF. However, with the increasing popularity of the concept of environmental protection and energy saving, various markets have made mandatory regulations on PF from the standard. However, if the PF value of the existing circuit needs to be improved, the circuit must be greatly modified, which g...

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