Time sequence protection circuit for controlling depletion type power device

Abstract

The invention discloses a time sequence protection circuit for controlling a depletion type power device. The time sequence protection circuit comprises a DAC, a first inverse phase proportional operational circuit, a second inverse phase proportional operational circuit, a voltage comparator, an enable signal output module and a PMOS tube control circuit, wherein the DAC comprises a first voltageoutput end and a second voltage output end; the first end of the first inverse phase proportional operational circuit is connected to the first voltage output end, and the second end of the first inverse phase proportional operational circuit serves as a grid voltage output end; the second inverse phase proportional operational circuit is connected between the second end of the first inverse phase proportional operational circuit and the negative input voltage end of the voltage comparator; the positive input voltage end of the voltage comparator is connected to the second voltage output end;and the enable signal output module is used for outputting an enable signal to the PMOS tube control circuit when the voltage comparator outputs the low level. The technical problem that the depletion type power device is burnt due to the fact that the inverse phase proportional operational circuit is damaged or the grid voltage is not appropriate in the prior art is solved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a sequential protection circuit for controlling depletion-type power devices. Background technique [0002] With the commercialization of 4G communication standards, the design requirements for power amplifiers are becoming more and more stringent. In power amplifiers, depletion-type power devices are often used. Depletion-type power devices are generally field effect transistors, which have three poles, which are Gate, Source, and drain. In essence, it belongs to a voltage-controlled current-type device (the gate voltage controls whether the drain can be turned on), and the turn-on voltage of the depletion-type power device is a negative voltage. Common depletion-mode power devices include GaAs devices and GaN devices. [0003] When depletion-mode power devices are used, it is necessary to strictly abide by the order of gate first and then drain, otherwise it may be perman...

AI Technical Summary

Problems solved by technology

[0009] The invention provides a timing protection circuit for controlling depletion-type power devices, which solves the technical problem in the prior art that the inverse proportional operation circuit is damaged or the grid voltage is not suitable, which will cause the depletion-type power devices to burn out

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