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High-input-voltage double-loop stable linear voltage regulator

A linear voltage regulator, high input technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve problems such as energy accumulation in the tube, damage to devices, and easy to cause avalanches

Active Publication Date: 2020-05-22
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the LDO circuit, the high-power switching tube may accumulate energy in the tube due to over-current during operation, which may easily cause avalanche and damage the device. Therefore, in practical applications, over-current protection is the key to maintaining reliable and stable operation of power devices.

Method used

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  • High-input-voltage double-loop stable linear voltage regulator
  • High-input-voltage double-loop stable linear voltage regulator
  • High-input-voltage double-loop stable linear voltage regulator

Examples

Experimental program
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Effect test

Embodiment 1

[0077] refer to figure 2 , a circuit diagram of the error amplifier unit 1 provided by the embodiment of the present invention. The error amplifier unit 1 is composed of a first transistor Q1, a second transistor Q2, two NPN transistors, a third to sixth PMOS transistors P3-P6, four PMOS transistors, and first to sixth NMOS transistors N1-N6 It consists of six NMOS transistors and two resistors, the first resistor R1 and the first resistor R2; the devices used in the error amplifier unit 1 are all 5V common devices; wherein:

[0078] The first transistor Q1, the second transistor Q2, the first resistor R1, and the second resistor R2 form an input terminal, wherein the base of the first transistor Q1 is the third input terminal of the error amplifier unit 1, Connected to the output terminal VFB of the voltage dividing feedback unit 6, the emitter is connected to one end of the first resistor R1, the collector is connected to the gate terminal of the third PMOS transistor P3 a...

Embodiment 2

[0111] image 3 It is the circuit diagram of the error amplifier unit provided in the second embodiment, and the other modules are the same as those in the first embodiment. The error amplification unit 1 consists of a third transistor Q3, a fourth transistor Q4, two NPN transistors, the seventh to eleventh PMOS transistors P7P11, five PMOS transistors, and the seventh to eleventh NMOS transistors N7 and N12. An NMOS transistor and two resistors of the third resistor R3 and the fourth resistor R4 are formed; the devices used in the error amplifier unit (1) are 5V common devices; wherein:

[0112] The third transistor Q3, the fourth transistor Q4, the third resistor R3, and the fourth resistor R4 form an input terminal, wherein the base of the third transistor Q3 is the third input terminal of the error amplifier unit 1, Connected to the output terminal VFB of the voltage division feedback unit (6), the emitter is connected to one end of the third resistor R3, and the collecto...

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PUM

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Abstract

The invention discloses a high-input-voltage double-loop stable linear voltage regulator. The linear voltage regulator comprises an error amplification unit (1), an overcurrent protection unit (2), acompensation circuit unit (3), a secondary amplification unit (4), a current sampling unit (5), a first PMOS transistor P1 and a second PMOS transistor P2. The error amplification unit (1) is used forcompleting conversion from double-end input to single-end output; the overcurrent protection unit (2) is used for realizing an over-current protection function; the compensation circuit unit (3) is used for ensuring the stability of a loop under various loads; and the secondary amplification unit (4) is used for converting the output of an error amplifier into two paths of control signals relatedto the power supply voltage. There are an error amplification unit main loop and an over-current protection loop, the two loops are both provided with frequency compensation circuits, and frequency compensation does not interfere with each other. The voltage regulator is suitable for a power supply environment with high power supply voltage and a large load change range.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a linear voltage regulator circuit with high input voltage double-loop stability. Background technique [0002] With the rapid development of today's integrated circuit industry, the domestic electronic chip service field has begun to shift from portable electronic devices such as mobile phones to automotive electronics. Compared with portable electronics, automotive electronics has the advantages of a long service life and is not easy to be replaced. Therefore, for companies, automotive electronics can bring more stable cash flow than consumer electronics. At the same time, due to the price difference between automotive electronics and consumer electronics, customers are less sensitive to price changes in automotive electronics, so automotive electronics have higher profits. [0003] Common power management chips include switching power supply DC-DC and ...

Claims

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Application Information

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IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 来新泉吴美中王宇恒胡枭刘晨
Owner XIDIAN UNIV
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