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a protection circuit

A technology for protecting circuits and output circuits, which is applied in the field of circuits and can solve problems such as low reliability and complex implementation

Active Publication Date: 2021-07-06
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this method protects different circuits, because different circuits have different threshold values, different electronic components (such as resistors with different resistance values, etc.) are required to protect different circuits, so the implementation is more complicated.
The other is to use software protection, that is, use ADC for voltage sampling, and implement corresponding protection strategies when abnormalities are found. This method is less reliable.

Method used

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Embodiment Construction

[0025] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings, which cannot be used to limit the protection scope of the present invention. It should be noted that, in the case of no conflict, the embodiments in the present application and various manners in the embodiments can be combined with each other.

[0026] see figure 2 , the present invention also proposes a protection circuit, comprising at least:

[0027] The input circuit is used to output the power supply voltage to the processing circuit multiple times when the power supply is powered on or after the power supply is powered on; output the power supply voltage to the output circuit after a preset time after outputting the power supply voltage to the processing circuit each time;

[0028] Among them, the 1-to-2 analog switch can be used to output the power supply voltage to the processing circuit mul...

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Abstract

The invention discloses a protection circuit, which at least includes: an input circuit for outputting a power supply voltage to a processing circuit multiple times when the power supply is powered on or after the power supply is powered on; After a period of time, the power supply voltage is output to the output circuit; the processing circuit is used to compare the power supply voltage with the first voltage threshold, compare the power supply voltage with the second voltage threshold, and when the power supply voltage is greater than the second voltage threshold and less than or equal to the first voltage threshold , output the first voltage threshold to the output circuit; the output circuit is used to compare the power supply voltage with the first voltage threshold, and when the power supply voltage is less than or equal to the first voltage threshold, output the power supply voltage to supply power to the circuit to be protected. The invention simply realizes the protection of different circuits and ensures the reliability.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a protection circuit. Background technique [0002] The power amplifier is the main component of wireless communication equipment, and the static operating point of the power amplifier (also known as the grid voltage of the power amplifier, referred to as the gate voltage) is a necessary condition for the normal operation of the power amplifier. figure 1 A schematic diagram of the location of the protection circuit in the power amplifier. Such as figure 1 As shown, the design of the power amplifier generally adopts the method of microcontroller (MCU, Microcontrollers) + digital to analog converter (DAC, Digital to Analog Converter), and the DAC chip provides the grid voltage for the power amplifier tube (that is, metal-oxide semiconductor field effect Transistor (MOSFET, Metal-OxideSemiconductor Field-Effect Transistor) gate to source voltage), the protection circuit is between the MCU+...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/52H03F3/20
CPCH03F1/52
Inventor 杜建洋
Owner ZTE CORP