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Low dropout linear voltage stabilization circuit and voltage adjustment rate compensation unit and method

A voltage regulation, low dropout linear technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as unstable output voltage, and achieve the effect of compensating for the drop of output voltage and improving circuit performance

Active Publication Date: 2019-01-25
CHINA RESOURCES MICROELECTRONICS (CHONGQING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a low-dropout linear voltage regulator circuit, a voltage regulation rate compensation unit and a method for solving the problem of unstable output voltage caused by the load adjustment phenomenon in the prior art

Method used

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  • Low dropout linear voltage stabilization circuit and voltage adjustment rate compensation unit and method
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  • Low dropout linear voltage stabilization circuit and voltage adjustment rate compensation unit and method

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Embodiment 1

[0054] like figure 1 As mentioned above, the present invention provides a voltage regulation rate compensation unit 1, and the voltage regulation rate compensation unit 1 includes at least:

[0055] A temperature sensing module 11 , a reference voltage generation module 12 , a comparator 13 and a reference adjustment module 14 .

[0056] like figure 1 As shown, the temperature sensing module 11 detects the temperature of the environment where the voltage adjustment rate compensation unit 1 is located, and outputs a corresponding temperature detection voltage Vtemp.

[0057] Specifically, the temperature sensing module 11 includes a first current source, a second current source, a first transistor PNP1 and a second transistor PNP2. In this embodiment, the first current source is the first PMOS transistor PM1, and the second current source is the second PMOS transistor PM2. Other devices that can realize the function of the current source are applicable to the present inventio...

Embodiment 2

[0067] The present invention also provides a low-dropout linear voltage stabilizing circuit, the low-dropout linear voltage stabilizing circuit at least includes:

[0068] The power tube PM9, the feedback network 3, the operational amplifier 2, the voltage regulation compensation unit 1, the output capacitor Cout and the load resistor Rload.

[0069] like Figure 4 As shown, the source terminal of the power transistor PM9 is connected to the power supply voltage VDD, the drain terminal is connected to the feedback network 3, and the gate terminal is connected to the output terminal of the operational amplifier 2, and the output voltage is adjusted under the control of the operational amplifier 2 Vout.

[0070] Specifically, the power transistor PM9 is a PMOS transistor, and different types of power transistors can be provided according to needs in actual use, which is not limited to this embodiment.

[0071] Specifically, the feedback network 3 includes a first feedback resi...

Embodiment 3

[0078] The present invention also provides a compensation method for voltage adjustment rate. Based on the low-dropout linear voltage regulator circuit, the compensation method for voltage adjustment rate at least includes:

[0079] When the load current is small and the ambient temperature is relatively low, a reference voltage is generated, and the reference voltage is compared with the feedback voltage to adjust the power transistor to generate a stable output voltage;

[0080]As the load current increases, the ambient temperature increases, and when the ambient temperature exceeds a set temperature, the reference voltage increases to adjust the power transistor to compensate for a drop in output voltage caused by load adjustment.

[0081] The set temperature can be set according to the specific circuit structure and the magnitude of the required load current, which will not be repeated here.

[0082] Specifically, such as Figure 4 As shown, when the load current is small...

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Abstract

The present invention provides a low dropout linear voltage stabilization circuit and voltage adjustment rate compensation unit and method, comprising generating a reference voltage through a reference voltage generating module; detecting temperature through a temperature sensing module; wherein when ambient temperature exceeds a predetermined temperature, the temperature sensing module compensates the reference voltage generated by the reference voltage generating module, thereby controlling a power tube to adjust an output voltage to compensate for a drop of the output voltage caused by loadregulations. The low dropout linear voltage stabilization circuit and voltage adjustment rate compensation unit and method are directed to a load regulation phenomenon of the low-dropout linear voltage stabilization circuit and aim at improving performance of circuits through increasing the reference voltage to compensate for the drop of the output voltage caused by the load regulations by adjusting the load regulation phenomenon of the low-dropout linear voltage regulator circuit.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a low-dropout linear voltage stabilizing circuit, a voltage adjustment rate compensation unit and a method. Background technique [0002] Power management is an essential part of mobile portable devices, electric vehicles, and power electronic systems. Electric vehicles, mobile phones, computers and various mobile power devices all require power management systems to improve their working efficiency and service life. However, whether it is powered by rectified AC mains (or AC adapter) or by a battery pack, the power supply voltage will vary within a wide range during operation. The output voltage of various rectifiers is not only affected by the change of mains voltage, but also by the change of load. In order to ensure a stable power supply voltage, almost all electronic equipment is powered by a voltage regulator. Small precision electronic equipment also requires a ...

Claims

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Application Information

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IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 张辉周乐郑泽人
Owner CHINA RESOURCES MICROELECTRONICS (CHONGQING) CO LTD