CN112269420A - Low dropout linear voltage stabilizing circuit for realizing current-limiting protection - Google Patents
Low dropout linear voltage stabilizing circuit for realizing current-limiting protection Download PDFInfo
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- CN112269420A CN112269420A CN202011071000.2A CN202011071000A CN112269420A CN 112269420 A CN112269420 A CN 112269420A CN 202011071000 A CN202011071000 A CN 202011071000A CN 112269420 A CN112269420 A CN 112269420A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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Abstract
The invention discloses a low-dropout linear voltage stabilizing circuit for realizing current-limiting protection, which comprises an operational amplifier unit, a current-limiting modulation current unit and a low-voltage modulation current unit, the input end of the operational amplifier unit is connected with a reference voltage Vref, the output end of the operational amplifier unit is connected with a current-limiting modulation current unit, the current-limiting modulation current unit comprises a triode Q, a transistor PM1, a transistor PM2, a transistor NM1 and a transistor NM2, the base electrode of the triode Q is connected with the output end of the operational amplifier unit, the collector electrode of the triode Q is used as the input end of a bias current I1, the emitter electrode of the triode Q is connected with a transistor NM1, a transistor NM1 and a transistor NM2 jointly form a current mirror circuit, and both are connected to a low voltage modulation current unit comprising an OTA circuit, the operating region of transistor PM1, which is a high voltage tube, is driven at different voltages by the OTA circuit. The invention realizes the current-limiting protection effect of the low dropout linear voltage stabilizing circuit under different input voltages.
Description
Technical Field
The invention relates to a voltage stabilizing circuit, in particular to a low dropout linear voltage stabilizing circuit for realizing current limiting protection.
Background
The low dropout regulator is a new generation of integrated circuit regulator, and the biggest difference between the low dropout regulator and a three-terminal regulator is that the low dropout regulator is a micro system on a chip with low self-consumption. The low-dropout linear regulator can be used for controlling a current main channel and has the functions of overcurrent protection, overtemperature protection, a precision reference source, a differential amplifier, a delayer and the like.
The current low dropout linear regulator in the market can not realize the current limiting protection of the regulator, so that the regulator can not obtain corresponding protection under different input voltages.
Disclosure of Invention
The invention aims to provide a low dropout linear voltage stabilizing circuit for realizing current-limiting protection, which is suitable for the current-limiting protection function of the low dropout linear voltage stabilizing circuit under different input voltages.
The technical scheme adopted by the invention is as follows: a low dropout linear voltage regulator circuit for realizing current-limiting protection comprises an operational amplifier unit, a current-limiting modulation current unit and a low-voltage modulation current unit, the input end of the operational amplifier unit is connected with a reference voltage Vref, the output end of the operational amplifier unit is connected with a current-limiting modulation current unit, the current-limiting modulation current unit includes a transistor Q, a transistor PM1, a transistor PM2, a transistor NM1, a transistor NM2, the base electrode of the triode Q is connected with the output end of the operational amplifier unit, the collector electrode of the triode Q is used as the input end of the bias current I1, the emitter electrode of the triode Q is connected with the transistor NM1, the transistor NM1 and the transistor NM2 together form a current mirror circuit, the transistor PM1 and the transistor PM2 are connected in series, and both are connected to a low voltage modulation current unit comprising an OTA circuit, the operating region of transistor PM1, which is a high voltage tube, is driven at different voltages by the OTA circuit.
Further, the operational amplifier unit comprises an operational amplifier U1, wherein a non-inverting input end of the operational amplifier U1 is connected with a reference voltage Vref, an inverting input end of the operational amplifier U1 is grounded through a resistor R4, an output end of the operational amplifier U is connected with a base electrode of the triode Q, and meanwhile, the output end of the operational amplifier U1 is connected with the inverting input end through a capacitor C1 and a resistor R2 which are connected in series.
Further, the gates of the transistor NM1 and the transistor NM2 are connected to each other, the sources of the transistor NM1 and the transistor NM2 are connected to each other, while the drain of the transistor NM1 is connected to the gate thereof and to the emitter of the transistor Q via the resistor R1, the drain of the transistor NM2 is connected to the drain of the transistor PM1, and the source of the transistor PM1 is connected to the drain of the transistor PM 2.
Further, the low-voltage modulation current unit comprises an operational amplifier U2 and a transistor PM3, wherein a non-inverting input terminal of the operational amplifier U2 is connected with a power supply VDD and a drain of the transistor PM3 and is connected to an inverting input terminal of the operational amplifier U1 through a resistor R3, an inverting input terminal of the operational amplifier U2 is connected with a source of the transistor PM1 and a drain of the transistor PM2, an output terminal of the operational amplifier U2 is connected with a gate of the transistor PM1, a gate of the transistor PM3 is connected with a gate of the transistor PM2, a source of the transistor PM3 is connected with a source of the transistor PM2, and a source of the transistor PM3 and a source of the transistor PM2 are simultaneously connected to an output terminal of the operational amplifier U2 through a capacitor.
Further, the triode Q is an NPN type triode.
The invention has the beneficial effects that: the invention realizes the current-limiting protection effect of the low dropout linear voltage regulator circuit under different input voltages, and improves the stability and reliability of the whole power supply voltage stabilizer.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a circuit diagram of a current limiting protected low dropout linear voltage regulator circuit.
Fig. 2 is a circuit diagram of a current-limited modulated current unit.
Fig. 3 is a circuit diagram of a low voltage modulated current unit.
Fig. 4 is a voltage variation operation diagram.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
As shown in fig. 1 to 3, a low dropout linear voltage regulator circuit for implementing current-limiting protection includes an operational amplifier unit, a current-limiting modulation current unit and a low-voltage modulation current unit, the input end of the operational amplifier unit is connected with a reference voltage Vref, the output end of the operational amplifier unit is connected with a current-limiting modulation current unit, the current-limiting modulation current unit includes a transistor Q, a transistor PM1, a transistor PM2, a transistor NM1, a transistor NM2, the base electrode of the triode Q is connected with the output end of the operational amplifier unit, the collector electrode of the triode Q is used as the input end of the bias current I1, the emitter electrode of the triode Q is connected with the transistor NM1, the transistor NM1 and the transistor NM2 together form a current mirror circuit, the transistor PM1 and the transistor PM2 are connected in series, and both are connected to a low voltage modulation current unit comprising an OTA circuit, the operating region of transistor PM1, which is a high voltage tube, is driven at different voltages by the OTA circuit.
In this embodiment, the operational amplifier unit includes an operational amplifier U1, a non-inverting input terminal of the operational amplifier U1 is connected to a reference voltage Vref, an inverting input terminal is grounded through a resistor R4, an output terminal is connected to a base of a transistor Q, and an output terminal is connected to the inverting input terminal through a capacitor C1 and a resistor R2 connected in series. The gates of the transistors NM1 and NM2 are connected to each other, the sources of the transistors NM1 and NM2 are connected to each other, while the drain of the transistor NM1 is connected to the gate thereof and to the emitter of the transistor Q via a resistor R1, the drain of the transistor NM2 is connected to the drain of the transistor PM1, and the source of the transistor PM1 is connected to the drain of the transistor PM 2.
In this embodiment, the low-voltage modulation current unit includes an operational amplifier U2 and a transistor PM3, a non-inverting input terminal of the operational amplifier U2 is connected to a power supply VDD and a drain of the transistor PM3 and is connected to an inverting input terminal of the operational amplifier U1 through a resistor R3, an inverting input terminal of the operational amplifier U2 is connected to a source of the transistor PM1 and a drain of the transistor PM2, an output terminal of the operational amplifier U2 is connected to a gate of the transistor PM1, a gate of the transistor PM3 is connected to a gate of the transistor PM2, a source of the transistor PM3 is connected to a source of the transistor PM2, and a source of the transistor PM3 and a source of the transistor PM2 are simultaneously connected to an output terminal of the operational amplifier U2 through.
In summary, the reference voltage generating circuit provides the reference voltage Vref for the positive terminal of the operational amplifier circuit, and the negative terminal of the operational amplifier circuit is the feedback voltage. The bias current generating circuit provides a bias current I1 for the circuit, and the resistor R1 is used as loop gain adjustment. The reference voltage Vref compensates the loop stability through a resistor R2 and a capacitor C1 (Miller compensation) by an operational amplifier circuit, the output voltage can be adjusted by adjusting the voltage division of resistors R3 and R4, the voltage at the A point (the voltage at the drain end of the high voltage pipe PM 2) and the voltage at the VDD point (the voltage at the drain end of the power pipe PM 3) drive the working area of the high voltage pipe PM1 under different voltage conditions through an OTA (operational Transmission Amplifier) circuit, and the gate capacitor C2 is stabilized as a compensation loop at an OTA circuit module. Under the condition that the circuit works under an external voltage load, current amplification is carried out through a current mirror formed by NM1 and NM2, namely the current of the high-voltage pipe PM2 is limited by the current mirror of the high-voltage pipe PM2 and the power pipe PM3 through the external load.
The invention utilizes the characteristic of current limiting, the bias current passes the self requirement, the input current can be adjusted by adjusting the current, the current passing through the resistor R1 is assumed as I1, the bias current is copied through the current mirror formed by NM1 and NM2, the current passing through NM2 is the proportion of the bias current I1, and the current is limited by the bias current, thereby achieving the effect of current limiting protection.
As shown in fig. 4, when the circuit operates at the scan voltage, with point X as a boundary, when the operating voltage is before point X, the power tube PM3 operates in the saturation region, the voltage at point a (the source terminal voltage of PM 1) through the OTA circuit is higher than the voltage at point VDD (the drain terminal voltage of PM 3) of the OTA circuit, and the voltage driving point B, that is, the high voltage tube PM1 operates in the linear region, and the high voltage tube PM2 and the power tube PM3 constitute a proportional current mirror. The working voltage of the circuit is reduced, after the working voltage is at the point X, the power tube PM3 works in a linear region, the OTA circuit keeps the voltage at the point A (the source end voltage of PM 1) and the VDD voltage of the OTA circuit (the drain end voltage of PM 3) the same, the voltage at the point B is driven, namely the high-voltage tube PM1 works in a saturation region, and at the moment, the high-voltage tube PM1 works in the saturation region and is used for maintaining the current mirror proportion formed by the high-voltage tube PM2 and the power tube PM 3. The loop adjustment enables the power tube PM3 to provide an external current load, and meanwhile the maximum current of the PM3 is limited to a fixed multiple of I1 to achieve current limiting protection.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the scope of the present invention in any way, and all technical solutions obtained by using equivalent substitution methods fall within the scope of the present invention.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (5)
1. A low dropout linear voltage regulator circuit for realizing current-limiting protection is characterized by comprising an operational amplifier unit, a current-limiting modulation current unit and a low-voltage modulation current unit, the input end of the operational amplifier unit is connected with a reference voltage Vref, the output end of the operational amplifier unit is connected with a current-limiting modulation current unit, the current-limiting modulation current unit includes a transistor Q, a transistor PM1, a transistor PM2, a transistor NM1, a transistor NM2, the base electrode of the triode Q is connected with the output end of the operational amplifier unit, the collector electrode of the triode Q is used as the input end of the bias current I1, the emitter electrode of the triode Q is connected with the transistor NM1, the transistor NM1 and the transistor NM2 together form a current mirror circuit, the transistor PM1 and the transistor PM2 are connected in series, and both are connected to a low voltage modulation current unit comprising an OTA circuit, the operating region of transistor PM1, which is a high voltage tube, is driven at different voltages by the OTA circuit.
2. The low dropout linear voltage regulator circuit with current-limiting protection as claimed in claim 1, wherein said operational amplifier unit comprises an operational amplifier U1, a non-inverting input terminal of said operational amplifier U1 is connected to a reference voltage Vref, an inverting input terminal is connected to ground through a resistor R4, an output terminal is connected to a base of a transistor Q, and the output terminal is connected to the inverting input terminal through a capacitor C1 and a resistor R2 connected in series.
3. The low dropout linear voltage regulator circuit for realizing current limiting protection of claim 1, wherein the gates of said transistor NM1 and NM2 are connected to each other, the sources of said transistor NM1 and NM2 are connected to each other, while the drain of said transistor NM1 is connected to its gate and to the emitter of said transistor Q via a resistor R1, the drain of said transistor NM2 is connected to the drain of a transistor PM1, and the source of said transistor PM1 is connected to the drain of a transistor PM 2.
4. The low dropout linear voltage regulator circuit for realizing current-limiting protection of claim 1 or 3, wherein said low voltage modulation current unit comprises an operational amplifier U2 and a transistor PM3, a non-inverting input terminal of said operational amplifier U2 is connected to a power supply VDD and a drain of a transistor PM3 and is connected to an inverting input terminal of an operational amplifier U1 through a resistor R3, an inverting input terminal of an operational amplifier U2 is connected to a source of a transistor PM1 and a drain of a transistor PM2, an output terminal of an operational amplifier U2 is connected to a gate of a transistor PM1, a gate of a transistor PM3 is connected to a gate of a transistor PM2, a source of a transistor PM3 is connected to a source of a transistor PM2, and a source of a transistor PM3 and a source of a transistor PM2 are simultaneously connected to an output terminal of an operational amplifier U2 through a capacitor C2.
5. The low dropout linear voltage regulator circuit of claim 1, wherein said transistor Q is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011071000.2A CN112269420A (en) | 2020-10-09 | 2020-10-09 | Low dropout linear voltage stabilizing circuit for realizing current-limiting protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011071000.2A CN112269420A (en) | 2020-10-09 | 2020-10-09 | Low dropout linear voltage stabilizing circuit for realizing current-limiting protection |
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| CN112269420A true CN112269420A (en) | 2021-01-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114020086A (en) * | 2021-11-11 | 2022-02-08 | 无锡迈尔斯通集成电路有限公司 | LDO current limiting circuit linearly changing along with input voltage |
| CN114967830A (en) * | 2022-05-16 | 2022-08-30 | 广东省大湾区集成电路与系统应用研究院 | Current limiting circuit, chip and electronic equipment |
| CN116774766A (en) * | 2023-07-26 | 2023-09-19 | 北京中科格励微科技有限公司 | High-voltage output linear voltage stabilizer circuit with current limiting protection function |
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| KR19980083287A (en) * | 1997-05-13 | 1998-12-05 | 문정환 | Bias current generator |
| US20070024350A1 (en) * | 2005-08-01 | 2007-02-01 | Chun-Sheng Huang | Differential amplifier and low drop-out regulator with thereof |
| CN101295928A (en) * | 2007-04-27 | 2008-10-29 | 精工电子有限公司 | Voltage regulator |
| CN107797602A (en) * | 2016-08-31 | 2018-03-13 | 意法半导体股份有限公司 | Miller-compensated circuit and corresponding adjuster, system and method |
| CN110456854A (en) * | 2019-08-22 | 2019-11-15 | 上海华力微电子有限公司 | Low pressure difference linear voltage regulator |
| CN213042170U (en) * | 2020-10-09 | 2021-04-23 | 广东澳鸿科技有限公司 | Low dropout linear voltage stabilizing circuit for realizing current-limiting protection |
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2020
- 2020-10-09 CN CN202011071000.2A patent/CN112269420A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980083287A (en) * | 1997-05-13 | 1998-12-05 | 문정환 | Bias current generator |
| US20070024350A1 (en) * | 2005-08-01 | 2007-02-01 | Chun-Sheng Huang | Differential amplifier and low drop-out regulator with thereof |
| CN101295928A (en) * | 2007-04-27 | 2008-10-29 | 精工电子有限公司 | Voltage regulator |
| CN107797602A (en) * | 2016-08-31 | 2018-03-13 | 意法半导体股份有限公司 | Miller-compensated circuit and corresponding adjuster, system and method |
| CN110456854A (en) * | 2019-08-22 | 2019-11-15 | 上海华力微电子有限公司 | Low pressure difference linear voltage regulator |
| CN213042170U (en) * | 2020-10-09 | 2021-04-23 | 广东澳鸿科技有限公司 | Low dropout linear voltage stabilizing circuit for realizing current-limiting protection |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114020086A (en) * | 2021-11-11 | 2022-02-08 | 无锡迈尔斯通集成电路有限公司 | LDO current limiting circuit linearly changing along with input voltage |
| CN114967830A (en) * | 2022-05-16 | 2022-08-30 | 广东省大湾区集成电路与系统应用研究院 | Current limiting circuit, chip and electronic equipment |
| CN116774766A (en) * | 2023-07-26 | 2023-09-19 | 北京中科格励微科技有限公司 | High-voltage output linear voltage stabilizer circuit with current limiting protection function |
| CN116774766B (en) * | 2023-07-26 | 2024-03-26 | 北京中科格励微科技有限公司 | High-voltage output linear voltage stabilizer circuit with current limiting protection function |
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