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Light-load transient enhanced circuit and low-voltage-difference linear voltage stabilizer integrated with circuit

A low-dropout linear, voltage-stabilizer technology, used in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as limited voltage slew rate, inability to respond to load transient switching, etc., to achieve low load current, enhanced Transient response performance, effect of short settling time

Inactive Publication Date: 2015-03-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of voltage regulator improves the problem of limited slew rate of power regulator tube voltage to a certain extent, its transconductance and unity gain bandwidth cannot respond to fast load transient switching under low bias current

Method used

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  • Light-load transient enhanced circuit and low-voltage-difference linear voltage stabilizer integrated with circuit
  • Light-load transient enhanced circuit and low-voltage-difference linear voltage stabilizer integrated with circuit
  • Light-load transient enhanced circuit and low-voltage-difference linear voltage stabilizer integrated with circuit

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Embodiment

[0033] In this example, if figure 1 As shown, a light-load transient enhancement circuit of the present invention includes: a dynamic bias voltage generation circuit 1, a load current control switch 2, a voltage stabilizing capacitor 3, a discharge circuit 4 and an output circuit 5;

[0034] Dynamic bias voltage generating circuit 1, including PMOS transistor MP1 and NMOS transistor MN1; the gate voltage of PMOS transistor MP1 is the gate voltage VGP of the adjustment transistor MP of the low dropout linear regulator, and the sources are respectively connected to the input power supply VDD, PMOS The drain of the transistor MP1 is connected to the drain and the gate of the NMOS transistor MN1, the source of the NMOS transistor MN1 is connected to the ground, and the dynamic bias voltage generation circuit 1 generates an adaptive bias voltage VBNA of the NMOS transistor, that is, the gate of the NMOS transistor MN1 Voltage;

[0035] Load current control switch 2, including PMOS...

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Abstract

The invention discloses a light-load transient enhanced circuit and a low-voltage-difference linear voltage stabilizer integrated with the circuit. The light-load transient enhanced circuit comprises a dynamic bias voltage generation circuit, a load current control switch, a voltage stabilizing capacitor, a discharging circuit and an output circuit; when the light-load transient enhanced circuit has a light load, no static current is consumed; when the low-voltage-difference linear voltage stabilizer is switched to the light load from a heavy load, gradually-reduced load current is provided by the light-load transient enhanced circuit, and the establishing time of the low-voltage-difference linear voltage stabilizer is greatly shortened, so that the problem that the establishing time for switching the current low-voltage-difference linear voltage stabilizer from the heavy load to the light load is too long is solved; secondly, extra auxiliary circuits are not needed so that the structure is simple and the transient response performance of the low-voltage-difference linear voltage stabilizer can be enhanced when the load is light, and furthermore, the light-load transient enhanced circuit can be applicable to ultralow-power-consumption medical electronics application.

Description

technical field [0001] The invention belongs to the technical field of power supply management, and more specifically relates to a light-load transient enhancement circuit and a low-dropout linear voltage regulator integrating the circuit. Background technique [0002] As an important part of the power management system, low-dropout linear regulators play an important role in various medical electronic equipment due to the advantages of fewer peripheral components, low output noise, and good transient performance. At present, the output capacitance range of the on-chip low dropout linear regulator is only 0-100pF, which can be fully integrated in the system, eliminating external off-chip capacitance, saving PCB pin area, speeding up the manufacturing process, and reducing system cost, so it is widely used be utilized. [0003] However, in ultra-low power medical electronic devices, such as voltage regulators for energy harvesting systems and passive RFID tags, energy is a r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 郑文锋屈熹刘珊杨波林鹏李晓璐
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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