Switch control circuit, chip, adaptor and switch control method

Abstract

The invention provides a switch control circuit, a chip, an adaptor and a switch control method. The switch control circuit is used for generating a power supply control signal and controlling a switch circuit to be connected in a delay way by detecting a first electrical signal reflecting power supply of a load and controlling the control switch circuit to be disconnected by detecting a second electrical signal reflecting an electrical signal in a power conversion circuit, and a part of electrical devices in the switch control circuit are maintained working according to the power supply control signal. By controlling the switch circuit to be connected in the delay way and starting power supply of a part of electrical devices in the switch control circuit within a delay period, light-loadpower supply can be timely and reliably achieved by employing a low-power consumption mode during a light-load period of the adaptor.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 201810443619.8 and the title of the invention "Switch control circuit, chip, adapter and switch control method" submitted to the China Patent Office on May 10, 2018, the entire contents of which are hereby incorporated by reference In this application. technical field

[0002] The present application relates to the technical field of drive circuits, in particular to a switch control circuit, a chip, an adapter and a switch control method. Background technique

[0003] Currently, adapters driven by bipolar junction transistors (BJT) on the market need auxiliary windings to provide power for the chip. The typical structure is the attached figure 1 As shown in the figure, in the application of low power less than 15W, the three windings of the transformer are generally composed of the primary winding 103 , the secondary winding 104 and the auxiliary winding 105 . 101 is a ...

Images