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Power supply switching circuit employing comparator and signal transmission method

A power switching and comparator technology, applied in circuit devices, emergency power arrangements, electrical components, etc., can solve problems such as fixed power switching thresholds, and achieve the effects of accurate thresholds, reduced power consumption, and accurate switching thresholds

Active Publication Date: 2016-09-21
西安航天民芯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical scheme of the present invention solves the problem of fixing the power switching threshold in the MCU and SOC circuits using battery standby

Method used

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  • Power supply switching circuit employing comparator and signal transmission method
  • Power supply switching circuit employing comparator and signal transmission method
  • Power supply switching circuit employing comparator and signal transmission method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] as attached image 3 As shown, the power switching circuit connection instructions:

[0050] A power switching circuit using a comparator, including a comparator CMP, a first inverter INV1, a second inverter INV2, a first buffer BUFF1, a second buffer BUFF2, a first PMOS switch tube PFET1, a second PMOS switch tube PFET2, third PMOS switch tube PFET3, fourth PMOS switch tube PFET4; the positive terminal of the comparator CMP is connected to the off-chip input power supply VDDIN, the negative terminal is connected to the backup power supply BATT, and the output terminal is connected to the first inverter Input terminals of INV1, the second inverter INV2, the first buffer BUFF1 and the second buffer BUFF2; the power supply of the first inverter INV1 is connected to the off-chip input power supply VDDIN, and the power supply of the second inverter INV2 is connected to the power switch The output VDDOUT of the circuit, the power supply of the first buffer BUFF1 is connecte...

Embodiment 2

[0066] The circuit connection diagram of the power switching circuit is attached image 3 As shown, it has been described in Example 1.

[0067] Such as Figure 5 As shown, the comparator circuit connection instructions:

[0068] The comparator samples the input power supply and the backup power supply voltage to determine whether the off-chip power supply is valid, and the comparator includes a sampling circuit of the off-chip input power supply VDDIN, a bias current generating circuit, a comparator main body, a sampling circuit of the backup power supply BATT and an implementation Mitter trigger.

[0069] The sampling circuit of the off-chip input power supply VDDIN is a MOS transistor series circuit of the off-chip input power supply VDDIN, and the MOS transistor series circuit includes a first voltage-dividing MOS transistor PD1', a second voltage-dividing MOS transistor PD2' and a third NMOS switch tube N3 ', the source of the first voltage-dividing MOS transistor PD1'...

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Abstract

The invention discloses a power supply switching circuit employing a comparator. The power supply switching circuit comprises a comparator, a first inverter, a second inverter, a first buffer, a second buffer, a first PMOS switch tube PFET1, a second PMOS switch tube, a third PMOS switch tube and a fourth PMOS switch tube. The invention further discloses a signal transmission method of the power supply switching circuit employing the comparator. The power supply switching circuit has the technical effects that (1) the switching threshold is accurate, and the switching logic is obtained by judging the sizes of an off-chip input power supply and a backup power supply; (2) the power supply switching is reliable, and the jitter and the instability of the overall power supply switching circuit caused by the jitter of comparator output when the power supply voltage is near a threshold point are avoided by a positive feedback circuit; and (3) the applicable process range is wide, and the power supply switching circuit is suitable for all MOS technologies due to adoption of a mainstream MOS technology design at present.

Description

technical field [0001] The invention relates to a power switching circuit applied to SOC and MCU circuits in battery standby mode, in particular to a power switching circuit using a comparator and a signal transmission method. Background technique [0002] In many chip designs that require standby mode, battery life is an indicator that must be carefully studied and considered. For example, many SOC and MCU chips have RTC (real time clock) standby timing function. In order to improve battery life, in addition to reducing the power consumption of the load circuit itself, timely and effective power switching is also necessary. For example, when the chip is turned on, that is, when the chip has an external power input, the power supply of the RTC module in the chip is switched to the off-chip input power supply; when the off-chip input power supply is removed, the power supply of the RTC module is automatically switched to the battery power. [0003] The existing power switch...

Claims

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Application Information

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IPC IPC(8): H02J9/06
CPCH02J9/061H02J9/068
Inventor 贾金辉周毅孙进军陈冬冬
Owner 西安航天民芯科技有限公司
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