Self-biased power path management drive circuit integrated in charger

A drive circuit and path management technology, which is applied in the direction of power reduction of current collectors, battery circuit devices, field effect transistors, etc., can solve the problems of increasing circuit area and power consumption, reduce circuit area and power consumption, and enhance driving capabilities Effect

Active Publication Date: 2021-02-23
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The drive control of the power transistor PM0 is realized by the power path management drive circuit (PowerPath Drive) according to the enable signal EN. How to generate the power transistor gate drive signal BAT_DRV with drive capability and compatible with low-voltage

Method used

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  • Self-biased power path management drive circuit integrated in charger
  • Self-biased power path management drive circuit integrated in charger
  • Self-biased power path management drive circuit integrated in charger

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[0022]In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0023]In order to cooperate with the control of the power tube PM0 in the charger, the present invention designs a self-biased power path management driving circuit. When the enable signal EN is valid, the output signal BAT_DRV generated by the power path management driving circuit is used to transfer the power When the enable signal EN is invalid, the output signal BAT_DRV generated by the power path management driving circuit turns on the power ...

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Abstract

The invention relates to a self-biased power path management drive circuit integrated in a charger. A floating ground generation module is configured to generate a floating ground signal having a driving capability, a voltage difference between the floating ground signal and a power supply voltage of the drive circuit is determined according to a power supply rail of an enable signal; a self-biasmodule generates current bias of the floating ground generation module by using a first resistor, a first NMOS transistor and a first PMOS transistor, and an extra bias current circuit is not needed;a level shift module is used for lifting a power rail of an enable signal to realize low-voltage control of high voltage, and can be compatible with low-voltage and medium-high voltage applications; alogic module is used for carrying out logic processing on the enable signal after the power rail is lifted by the level shift module to obtain an output signal of the power path management driving circuit, so that the power tube is disconnected when the enable signal is valid, the load is powered by external power supply voltage, and meanwhile, the battery is charged by the charger; when the enable signal is invalid, the power tube is conducted, and the battery supplies power to the load.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design / microelectronic design / electronic circuit, and relates to a drive circuit for power path management (PowerPath). bias current. Background technique [0002] Chargers often integrate power path management (PowerPath) to adapt to normal charging in various situations, such as figure 1 Shown is the charger integrated with the PowerPath channel, where VBUS is the external power supply voltage, and EN is the enable signal. The enable signal EN controls the charge pump (charge pump), DC-DC converter and power path management drive circuit (PowerPath Drive), the output of the charge pump (charge pump) controls the switch tubes NM3 and NM4, and the switch tubes NM3 and NM4 are connected to Between the external power supply voltage VBUS and the load port VSYS; the power path management drive circuit (PowerPath Drive) is used to control the power tube PM0, and the power tube PM0 is conne...

Claims

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Application Information

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IPC IPC(8): H03K19/0175H03K19/00H02J7/00
CPCH02J7/0063H02J7/0068H03K19/0013H03K19/0016H03K19/017509
Inventor 陈鑫
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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