Power supply time sequence circuit and power supplying method

Abstract

The invention provides a power supply time sequence circuit and a power supplying method. In the power supply time sequence circuit, a second power supply circuit charges after a first power supply circuit provides a first voltage, and provides a second voltage, namely only after the first power supply circuit provides the first voltage for a grid of a GaN radio frequency power amplifier, the second power supply charges and provides the second voltage for a drain of the GaN radio frequency power amplifier, and the grid charging is sooner than drain charging. After the second power supply is discharged and before the first power supply circuit is discharged, a discharging circuit quickly discharges the voltage on a second capacitor to zero, and at the moment, the voltage of the drain is zero. After the voltage on the second capacitor is discharged, the first power supply circuit is discharged, the condition that the first power supply circuit starts to be discharged when the voltage on the drain is not reduced to zero due to the voltage stored on the second capacitor is avoided, and the demand that the discharging of the grid is later than the discharging of the drain is met.

Description

technical field [0001] The application belongs to the technical field of wireless base station power supply equipment, and in particular relates to a power supply sequence circuit and a power supply method. Background technique [0002] The high-efficiency RF power amplifiers of wireless base stations generally use GaN RF power amplifiers. The characteristic of GaN RF power amplifiers is that a high-power positive voltage power supply is required to supply power to the drain of GaN RF power amplifiers, and a low-power negative voltage power supply is used for GaN RF power amplifiers. Grid supply for RF power amplifiers. For example, the second voltage supplies power to the drain, and the first voltage supplies power to the gate. And in order to protect the safety of the GaN RF power amplifier, the gate is powered on earlier than the drain, and the gate is powered off later than the drain. Specifically, after the gate is connected to the voltage, there can be voltage input a...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the purpose of this application is to provide a power sequence circuit and a power supply method for solving the problem that the existing power sequence circuit cannot meet the power-down sequence requirements

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