CN114527820B - Voltage stabilizer circuit and electronic equipment - Google Patents
Voltage stabilizer circuit and electronic equipment Download PDFInfo
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- CN114527820B CN114527820B CN202210136694.6A CN202210136694A CN114527820B CN 114527820 B CN114527820 B CN 114527820B CN 202210136694 A CN202210136694 A CN 202210136694A CN 114527820 B CN114527820 B CN 114527820B
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- 101100011077 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) nnt-1 gene Proteins 0.000 claims 4
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- 102100029391 Cardiotrophin-like cytokine factor 1 Human genes 0.000 description 8
- 101000989964 Homo sapiens Cardiotrophin-like cytokine factor 1 Proteins 0.000 description 8
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- 230000033228 biological regulation Effects 0.000 description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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- 238000007493 shaping process Methods 0.000 description 1
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention discloses a voltage stabilizer circuit and electronic equipment, wherein a first end of a power supply circuit of the voltage stabilizer circuit is respectively and electrically connected with a first end of a reference voltage circuit, a first end of a power tube driving circuit and a first end of an output power stage circuit; the second end of the reference voltage circuit is electrically connected with the second end of the power tube driving circuit; the third end of the reference voltage circuit is electrically connected with the first end of the load feedback circuit; the second end of the load feedback circuit is electrically connected with the second end of the output power stage circuit; the third end of the output power stage circuit is electrically connected with the third end of the power tube driving circuit; the third end of the load feedback circuit is used for being grounded; the fourth end of the power tube driving circuit is used for being grounded; the fourth end of the reference voltage circuit is used for grounding; the voltage stabilizer circuit is used for keeping the output voltage constant according to the temperature change condition and the load change condition. Therefore, the invention can obviously reduce the standby power consumption and the cost of the LDO system on the premise of ensuring smaller area and noise.
Description
Technical Field
The present invention relates to the field of voltage stabilizing technologies, and in particular, to a voltage stabilizer circuit and an electronic device.
Background
Along with the explosion of IOT application of everything interconnection, small volume, high efficiency and low power consumption are future application trends, and power chip designs are also developing towards low power consumption, high efficiency and few peripheral devices. The method is not only related to competitiveness, but also has certain help for saving energy and reducing the consumption and pollution of the lithium battery. The low power consumption application is different from the traditional application, and has the biggest characteristic that when power is supplied to a Sensor or MCU, WIFI, DSP, the power consumption index under normal standby is generally considered, and the power consumption index is not the power consumption index when the power is turned off. The power consumption of the power supply system is higher, and the technical difficulty of limiting the index is still the opposite to the quick response of the system. In the prior art, reference voltage BG or reference voltage in LDO components and error amplifier EA, buffer, power tube and other parts are considered separately, and each adopts an improvement means to reduce the overall power consumption, such as changing BG into low-precision Vrpn, and increasing load detection and variable bias in EA or Buffer parts. However, the power consumption of the existing scheme is still higher, generally more than 10uA, and the external reference voltage filter noise capacitor with more than 1uF is partially designed, so that the BOM cost is increased, the power-on speed is influenced, and even the power consumption is increased. Therefore, it is necessary to provide a voltage regulator circuit to significantly reduce the standby power consumption and cost of the LDO system while ensuring a smaller area and noise.
Disclosure of Invention
The invention aims to solve the technical problem of providing a voltage stabilizer circuit which can obviously reduce the standby power consumption and the cost of an LDO system on the premise of ensuring a smaller area and noise.
In order to solve the technical problem, a first aspect of the present invention discloses a voltage regulator circuit, which includes a power supply circuit, a reference voltage circuit, a power tube driving circuit, an output power stage circuit and a load feedback circuit, wherein:
the first end of the power supply circuit is electrically connected with the first end of the reference voltage circuit, the first end of the power tube driving circuit and the first end of the output power stage circuit respectively; the second end of the reference voltage circuit is electrically connected with the second end of the power tube driving circuit; the third end of the reference voltage circuit is electrically connected with the first end of the load feedback circuit; a second end of the load feedback circuit is electrically connected with a second end of the output power stage circuit; the third end of the output power stage circuit is electrically connected with the third end of the power tube driving circuit; the third end of the load feedback circuit is used for being grounded; the fourth end of the power tube driving circuit is used for being grounded; the fourth end of the reference voltage circuit is used for grounding;
the voltage stabilizer circuit is used for keeping the output voltage stable according to the temperature change condition and the load change condition.
As an optional implementation manner, in the first aspect of the present invention, the voltage regulator circuit further includes a reload detection circuit;
the first end of the heavy load detection circuit is electrically connected with the first end of the power supply circuit; the second end of the reload detection circuit is electrically connected with the second end of the reference voltage circuit; the third end of the heavy load detection circuit is electrically connected with the fifth end of the power tube driving circuit; the fourth end of the heavy load detection circuit is used for being grounded;
the heavy load detection circuit is used for comparing the detection voltage corresponding to the output load current with a preset threshold voltage so as to enable the inverter to overturn, and the overturned signal enables a part of the high-power-consumption circuit under heavy load.
As an optional implementation manner, in the first aspect of the present invention, the reference voltage circuit includes a first operational amplifier circuit and a first weak positive temperature coefficient current source;
wherein a first end of the first weak positive temperature coefficient current source is electrically connected with a first end of the power supply circuit; the second end of the first weak positive temperature coefficient current source is electrically connected with the first end of the first operational amplifier circuit; the second end of the first operational amplifier circuit is electrically connected with the second end of the power tube driving circuit; the third end of the first operational amplifier circuit is electrically connected with the first end of the load feedback circuit; the fourth end of the first operational amplifier circuit is used for connecting a reference voltage; the fifth end of the first operational amplifier circuit is used for grounding.
As an optional implementation manner, in the first aspect of the present invention, the reference voltage circuit includes a 2T temperature complementary structure circuit and an error amplifying circuit;
the 2T temperature complementary structure circuit comprises a first N-type tube NMOS1 and a second N-type tube NNT2; the error amplifying circuit comprises a first N-type pipe NMOS1, a first resistor R1 and a first capacitor C1;
the first end of the second N-type tube NNT2 is electrically connected with the first end of the power circuit; the first end of the first N-type tube NMOS1 is electrically connected to the second end of the second N-type tube NNT2, the third end of the second N-type tube NNT2, the first end of the first resistor R1, and the second end of the power tube driving circuit, respectively; the second end of the first N-type tube NMOS1 is electrically connected with the first end of the load feedback circuit; the second end of the first resistor R1 is electrically connected with the first end of the first capacitor C1; the third end of the first N-type tube NMOS1 is used for being grounded; the second end of the first capacitor C1 is grounded.
As an optional implementation manner, in the first aspect of the present invention, the power tube driving circuit includes a second operational amplifier circuit and a voltage-controlled variable current source;
wherein a first end of the voltage-controlled variable current source is electrically connected with a first end of the power supply circuit; the second end of the voltage-controlled variable current source is electrically connected with the first end of the second operational amplifier circuit; the second end of the second operational amplifier circuit is electrically connected with the second end of the reference voltage circuit; the third end of the second operational amplifier circuit is electrically connected with the third end of the output power stage circuit; the fourth end of the second operational amplifier circuit is used for grounding.
As an optional implementation manner, in the first aspect of the present invention, the power tube driving circuit includes a second resistor R2, a first P-type tube PMOS1, and a third N-type tube NMOS2;
wherein: the first end of the second resistor R2 is electrically connected with the first end of the power supply circuit; the second resistor R2 is electrically connected with the first end of the first P-type pipe PMOS 1; the second end of the first P-type pipe PMOS1 is electrically connected with the third end of the first P-type pipe PMOS1, the first end of the third N-type pipe NMOS2 and the third end of the output power stage circuit respectively; the second end of the third N-type tube NMOS2 is electrically connected with the second end of the reference voltage circuit; and the third end of the third N-type tube NMOS2 is used for grounding.
As an alternative embodiment, in the first aspect of the present invention, the load feedback circuit includes a third resistor R3, a fourth resistor R4, and a second capacitor CL;
wherein: the first end of the third resistor R3 is electrically connected with the second end of the output power stage circuit and the first end of the second capacitor CL respectively; the second end of the third resistor R3 is electrically connected with the first end of the fourth resistor R4 and the third end of the reference voltage circuit respectively; the second end of the second capacitor CL is used for grounding; the second end of the fourth resistor R4 is grounded.
As an optional implementation manner, in the first aspect of the present invention, the output power stage circuit includes a second P-type tube PMOS2;
the first end of the second P-type pipe PMOS2 is electrically connected with the first end of the power supply circuit; the second end of the second P-type pipe PMOS2 is electrically connected with the third end of the power tube driving circuit; and a third end of the second P-type tube PMOS2 is electrically connected to the first end of the third resistor R3 and the first end of the second capacitor CL, respectively.
As an optional implementation manner, in the first aspect of the present invention, the heavy load detection circuit includes a fourth N-type tube NNT1, a fifth N-type tube NMOS3, and an inverter INV;
wherein: the first end of the fourth N-type tube NNT1 is electrically connected with the first end of the power circuit; the second end of the fourth N-type tube NNT1 is electrically connected to the third end of the fourth N-type tube NNT1, the first end of the fifth N-type tube NMOS3 and the first end of the inverter INV, respectively; the second end of the fifth N-type tube NMOS3 is electrically connected with the second end of the reference voltage circuit; a second end of the inverter INV is electrically connected with a fifth end of the power tube driving circuit; and the third end of the fifth N-type tube NMOS3 is used for grounding.
A second aspect of the present invention discloses an electronic device, which is characterized in that the electronic device comprises the voltage regulator circuit according to any one of the first aspects.
The implementation of the invention has the following beneficial effects:
the invention discloses a voltage stabilizer circuit, which comprises a power supply circuit, a reference voltage circuit, a power tube driving circuit, an output power level circuit and a load feedback circuit, wherein: the first end of the power supply circuit is electrically connected with the first end of the reference voltage circuit, the first end of the power tube driving circuit is electrically connected with the first end of the output power stage circuit respectively; the second end of the reference voltage circuit is electrically connected with the second end of the power tube driving circuit; the third end of the reference voltage circuit is electrically connected with the first end of the load feedback circuit; the second end of the load feedback circuit is electrically connected with the second end of the output power stage circuit; the third end of the output power stage circuit is electrically connected with the third end of the power tube driving circuit; the third end of the load feedback circuit is used for being grounded; the fourth end of the power tube driving circuit is used for being grounded; the fourth end of the reference voltage circuit is used for grounding; the voltage stabilizer circuit is used for keeping the output voltage constant according to the temperature change condition and the load change condition. Therefore, the invention can obviously reduce the standby power consumption and the cost of the LDO system on the premise of ensuring smaller area and noise.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a voltage regulator circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another voltage regulator circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a voltage regulator circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a voltage regulator circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a 2T temperature complementary structure circuit according to an embodiment of the present invention.
Detailed Description
For a better understanding and implementation, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, unless explicitly specified and limited otherwise, the term "electrically connected" in the description of the invention and in the claims and in the above-mentioned figures should be understood in a broad sense, for example, as a fixed electrical connection, as a removable electrical connection, or as an integral electrical connection; can be mechanically and electrically connected or can be mutually communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. Furthermore, the terms first, second and the like in the description and in the claims of the invention and in the foregoing figures, are used for distinguishing between different objects and not for describing a particular sequential order, and are not intended to cover any exclusive inclusion. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1
Referring to fig. 1, fig. 1 is a schematic diagram of a voltage regulator circuit according to an embodiment of the present invention, which can be applied to any load requiring voltage regulation, and the embodiment of the present invention is not limited thereto. As shown in fig. 1, the voltage regulator circuit includes a power supply circuit, a reference voltage circuit, a power transistor driving circuit, an output power stage circuit, and a load feedback circuit, wherein:
the first end of the power supply circuit is electrically connected with the first end of the reference voltage circuit, the first end of the power tube driving circuit is electrically connected with the first end of the output power stage circuit respectively; the second end of the reference voltage circuit is electrically connected with the second end of the power tube driving circuit; the third end of the reference voltage circuit is electrically connected with the first end of the load feedback circuit; the second end of the load feedback circuit is electrically connected with the second end of the output power stage circuit; the third end of the output power stage circuit is electrically connected with the third end of the power tube driving circuit; the third end of the load feedback circuit is used for being grounded; the fourth end of the power tube driving circuit is used for being grounded; the fourth end of the reference voltage circuit is used for grounding;
the voltage stabilizer circuit is used for keeping the output voltage stable according to the temperature change condition and the load change condition, and has the characteristics of extremely low power consumption and low noise linearity.
Optionally, the voltage regulator circuit integrates the reference voltage and the output feedback voltage into a reference voltage, and replaces the traditional BG and multi-stage complex operational amplifier independent mechanism, so as to save power consumption, reduce noise and reduce off-chip noise filtering capacitance.
Optionally, the reference voltage is variable with load and is not constant.
Optionally, the above-described voltage regulator circuit is low noise and linear.
Optionally, compared with the standby power consumption of the whole LDO system with the current level of more than 10uA in the industry, the power consumption of the voltage regulator circuit can be within 2uA, and the voltage regulator circuit can be used for supplying power in various scenes such as low power consumption, IOT normal standby, RTC, sensor and the like, can reduce the standby power consumption by one order of magnitude, and greatly prolongs the standby time.
Optionally, the performance of the above-described voltage regulator circuit in terms of area, transient, PSRR, load regulation, etc. is not inferior to the traditional LDO architecture.
Optionally, the voltage stabilizer circuit includes a 2T temperature complementary structure circuit and a single-tube feedback amplifying structure.
The working principle of the voltage stabilizer circuit in the embodiment of the invention is as follows:
when the load is unchanged and the temperature changes, the current of the reference voltage circuit changes, and the change of the current can be counteracted with the change of the threshold voltage by taking a value through a proper pipe and combining the loop action. The feedback voltage of the load feedback circuit is regulated by the reference voltage circuit, and the voltage is amplified by the common source and then drives the grid stage in the power tube driving circuit, and then the output voltage is stabilized by the output power stage circuit; when the temperature is unchanged and the load is changed, the output voltage of the linear voltage stabilizer circuit is stabilized and output through the negative feedback action of the load feedback circuit and the loop gain action.
Therefore, the voltage regulator circuit described in the first embodiment can obviously reduce the standby power consumption and the cost of the LDO system on the premise of ensuring a smaller area and noise.
Example two
Referring to fig. 2, as shown in fig. 2, fig. 2 is a schematic structural diagram of a voltage regulator circuit according to another embodiment of the present invention, as shown in fig. 2, the voltage regulator circuit includes a power supply circuit, a reference voltage circuit, a power tube driving circuit, an output power stage circuit, and a load feedback circuit, wherein the voltage regulator circuit further includes a heavy load detection circuit;
the first end of the reload detection circuit is electrically connected with the first end of the power supply circuit; the second end of the reload detection circuit is electrically connected with the second end of the reference voltage circuit; the third end of the reload detection circuit is electrically connected with the fifth end of the power tube driving circuit; the fourth end of the heavy load detection circuit is used for grounding;
the reload detection circuit is used for comparing the detection voltage corresponding to the output load current with a preset threshold voltage so as to enable the inverter to overturn, and the overturned signal enables the part of the high-power-consumption circuit under the reload.
Optionally, the heavy load detection circuit can realize the effects of power saving during light load and high performance during heavy load.
In an alternative embodiment, the heavy load detection circuit includes a fourth N-type tube NNT1, a fifth N-type tube NMOS3, and an inverter INV;
wherein: the first end of the fourth N-type tube NNT1 is electrically connected with the first end of the power circuit; the second end of the fourth N-type tube NNT1 is electrically connected with the third end of the fourth N-type tube NNT1, the first end of the fifth N-type tube NMOS3 and the first end of the inverter INV respectively; the second end of the fifth N-type tube NMOS3 is electrically connected with the second end of the reference voltage circuit; a second end of the inverter INV is electrically connected with a fifth end of the power tube driving circuit; the third end of the fifth N-type tube NMOS3 is used for grounding.
Optionally, a first end of the inverter INV is connected to a first end of the fifth N-type tube NMOS3, and a result obtained after shaping the threshold voltage comparator is used as a flag signal for determining whether the load enters the heavy load section.
Optionally, the fourth N-type tube is an NNT intrinsic N-type tube.
Optionally, the fifth N-type tube is an NMOS tube.
Optionally, a second end of the inverter INV is electrically connected to a third end of the second resistor R2.
Optionally, a load current interval corresponding to the inversion point of the inverter INV is 10 mA-50 mA.
The working principle of the voltage stabilizer circuit in the embodiment of the invention is as follows:
when in heavy load, the load current influences the output voltage of the load feedback circuit, and the voltage is amplified by NMOS1 and then used as a corresponding heavy load detection voltage to be compared with a threshold voltage so as to enable the inverter to turn over. And after the signal is turned over, the high-power-consumption circuit such as the second resistor R2 in the part under heavy load is regulated so as to achieve the purposes of light load power saving and high performance under heavy load.
It should be noted that, for other descriptions of the voltage regulator circuit, please refer to the related descriptions in the first embodiment, and the descriptions are omitted herein.
Therefore, the voltage regulator circuit described in the second embodiment can obviously reduce the standby power consumption and the cost of the LDO system on the premise of ensuring a smaller area and noise.
Example III
Referring to fig. 3, fig. 3 is a schematic structural diagram of a voltage regulator circuit according to another embodiment of the present invention, where, as shown in fig. 3, the voltage regulator circuit includes a power supply circuit, a reference voltage circuit, a power tube driving circuit, an output power stage circuit, and a load feedback circuit, where the reference voltage circuit includes a first op-amp circuit and a first weak positive temperature coefficient current source;
wherein the first end of the first weak positive temperature coefficient current source is electrically connected with the first end of the power supply circuit; the second end of the first weak positive temperature coefficient current source is electrically connected with the first end of the first operational amplifier circuit; the second end of the first operational amplifier circuit is electrically connected with the second end of the power tube driving circuit; the third end of the first operational amplifier circuit is electrically connected with the first end of the load feedback circuit; the fourth end of the first operational amplifier circuit is used for connecting reference voltage; the fifth end of the first operational amplifier circuit is used for grounding.
Optionally, the first weak ptc current source is a second N-type tube NNT2.
Optionally, the second N-type tube is an NNT intrinsic N-type tube.
Optionally, a first end of the second N-type tube NNT2 is electrically connected to a first end of the power circuit.
Optionally, the second end of the second N-type tube NNT2 is electrically connected to the third end of the second N-type tube NNT2 and the first end of the first op-amp circuit respectively.
Optionally, the reference voltage circuit generates a parallel relationship between a reference voltage, a first weak positive temperature coefficient current source and the like and temperature, counteracts each other, and finally generates a stable output voltage of the linear voltage stabilizer irrelevant to the temperature.
For other descriptions of the voltage regulator circuit, please refer to the related descriptions in the first embodiment and the second embodiment, and are not repeated here.
Therefore, the voltage regulator circuit described in the third embodiment can obviously reduce the standby power consumption and the cost of the LDO system on the premise of ensuring a smaller area and noise.
Example IV
Referring to fig. 4, fig. 4 is a schematic structural diagram of a voltage regulator circuit according to another embodiment of the present invention, where, as shown in fig. 4, the voltage regulator circuit includes a power supply circuit, a reference voltage circuit, a power transistor driving circuit, an output power stage circuit, and a load feedback circuit, where the reference voltage circuit includes a 2T temperature complementary structure circuit and an error amplifying circuit;
the 2T temperature complementary structure circuit comprises a first N-type tube NMOS1 and a second N-type tube NNT2; the error amplifying circuit comprises a first N-type tube NMOS1, a first resistor R1 and a first capacitor C1;
the first end of the second N-type tube NNT2 is electrically connected with the first end of the power circuit; the first end of the first N-type tube NMOS1 is electrically connected with the second end of the second N-type tube NNT2, the third end of the second N-type tube NNT2, the first end of the first resistor R1 and the second end of the power tube driving circuit respectively; the second end of the first N-type tube NMOS1 is electrically connected with the first end of the load feedback circuit; the second end of the first resistor R1 is electrically connected with the first end of the first capacitor C1; the third end of the first N-type tube NMOS1 is used for being grounded; the second terminal of the first capacitor C1 is connected to ground.
Optionally, the first N-type tube is an NMOS tube.
Optionally, the voltage at the second end of the first N-type tube NMOS1 is both the negative feedback voltage of the load feedback circuit and the input reference voltage of the reference voltage circuit.
Optionally, in the 2T temperature complementary structure circuit, the reference voltage Vref irrelevant to temperature may be obtained by reasonably selecting the value of the first N-type tube.
As shown in fig. 5, a first end of the second N-type tube NNT2 in the 2T temperature complementary structure circuit is electrically connected to a first end of the power circuit; the second end of the second N-type tube NNT2 is electrically connected with other circuits; the third end of the second N-type tube NNT2 is electrically connected with the first end of the first N-type tube NMOS1 and the second end of the first N-type tube NMOS1 respectively; the third end of the first N-type tube NMOS1 is used for grounding.
Alternatively, the 2T temperature complementary structure circuit can be used independently as a low power consumption reference voltage, and can also be used in combination with other circuits.
In yet another optional embodiment, the power tube driving circuit includes a second operational amplifier circuit and a voltage-controlled variable current source;
wherein the first end of the voltage-controlled variable current source is electrically connected with the first end of the power circuit; the second end of the voltage-controlled variable current source is electrically connected with the first end of the second operational amplifier circuit; the second end of the second operational amplifier circuit is electrically connected with the second end of the reference voltage circuit; the third end of the second operational amplifier circuit is electrically connected with the third end of the output power stage circuit; the fourth terminal of the second operational amplifier circuit is used for grounding.
In yet another optional embodiment, the power tube driving circuit includes a second resistor R2, a first P-type tube PMOS1, and a third N-type tube NMOS2;
wherein: the first end of the second resistor R2 is electrically connected with the first end of the power supply circuit; the first end of the second resistor R2 is electrically connected with the first end of the first P-type pipe PMOS 1; the second end of the first P-type pipe PMOS1 is electrically connected with the third end of the first P-type pipe PMOS1, the first end of the third N-type pipe NMOS2 and the third end of the output power stage circuit respectively; the second end of the third N-type tube NMOS2 is electrically connected with the second end of the reference voltage circuit; the third end of the third N-type tube NMOS2 is connected to ground.
Optionally, the third N-type tube is an NMOS tube.
Optionally, the first P-type tube is a PMOS tube.
Optionally, the second resistor R2 is a variable resistor.
Optionally, the third end of the second resistor R2 is a resistance adjustment end of the variable resistor.
In yet another alternative embodiment, the load feedback circuit includes a third resistor R3, a fourth resistor R4, and a second capacitor CL;
wherein: the first end of the third resistor R3 is electrically connected with the second end of the output power stage circuit and the first end of the second capacitor CL respectively; the second end of the third resistor R3 is electrically connected with the first end of the fourth resistor R4 and the third end of the reference voltage circuit respectively; the second end of the second capacitor CL is grounded; the second end of the fourth resistor R4 is connected to ground.
In yet another alternative embodiment, the output power stage circuit includes a second P-type pipe PMOS2;
the first end of the second P-type pipe PMOS2 is electrically connected with the first end of the power supply circuit; the second end of the second P-type pipe PMOS2 is electrically connected with the third end of the power tube driving circuit; the third end of the second P-type tube PMOS2 is electrically connected to the first end of the third resistor R3 and the first end of the second capacitor CL, respectively.
Optionally, the second P-type tube is a PMOS tube.
For other descriptions of the voltage regulator circuit, please refer to the related descriptions in the first embodiment, the second embodiment and the third embodiment, which are not described herein.
Therefore, the voltage regulator circuit described in the fourth embodiment can obviously reduce the standby power consumption and the cost of the LDO system on the premise of ensuring a smaller area and noise.
Example five
The embodiment of the invention discloses electronic equipment which is equipment needing voltage stabilization and comprises a voltage stabilizer circuit of any one embodiment or two embodiments or three embodiments in the first embodiment to the fourth embodiment. It should be noted that, for the detailed description of the voltage regulator circuit, please refer to the detailed description of the related contents in the first to fourth embodiments, and the detailed description of this embodiment is omitted.
Therefore, the electronic device described in the fifth embodiment can significantly reduce standby power consumption and cost of the LDO system on the premise of ensuring a smaller area and noise.
The foregoing describes in detail a voltage regulator circuit and an electronic device according to embodiments of the present invention, and specific embodiments are applied to illustrate the principles and implementation of the present invention, but the foregoing preferred embodiments are not intended to limit the present invention, and the foregoing embodiments are only used to help understand the method and core idea of the present invention; also, it is apparent to those skilled in the art from this disclosure that many changes can be made in this embodiment and this application without departing from the spirit and scope of the invention, which is set forth in the following claims.
Claims (9)
1. The utility model provides a voltage regulator circuit, its characterized in that, voltage regulator circuit includes power supply circuit, reference voltage circuit, power tube drive circuit, output power level circuit and load feedback circuit, wherein:
the first end of the power supply circuit is electrically connected with the first end of the reference voltage circuit, the first end of the power tube driving circuit and the first end of the output power stage circuit respectively; the second end of the reference voltage circuit is electrically connected with the second end of the power tube driving circuit; the third end of the reference voltage circuit is electrically connected with the first end of the load feedback circuit; a second end of the load feedback circuit is electrically connected with a second end of the output power stage circuit; the third end of the output power stage circuit is electrically connected with the third end of the power tube driving circuit; the third end of the load feedback circuit is used for being grounded; the fourth end of the power tube driving circuit is used for being grounded; the fourth end of the reference voltage circuit is used for grounding;
the voltage stabilizer circuit is used for keeping the output voltage stable according to the temperature change condition and the load change condition;
and, the voltage regulator circuit further includes a reload detection circuit;
the first end of the heavy load detection circuit is electrically connected with the first end of the power supply circuit; the second end of the reload detection circuit is electrically connected with the second end of the reference voltage circuit; the third end of the heavy load detection circuit is electrically connected with the fifth end of the power tube driving circuit; the fourth end of the heavy load detection circuit is used for being grounded;
the heavy load detection circuit is used for comparing the detection voltage corresponding to the output load current with a preset threshold voltage so as to enable the inverter to overturn, and the overturned signal enables a part of the high-power-consumption circuit under heavy load.
2. The voltage regulator circuit of claim 1, wherein the reference voltage circuit comprises a first op-amp circuit and a first weak ptc current source;
wherein a first end of the first weak positive temperature coefficient current source is electrically connected with a first end of the power supply circuit; the second end of the first weak positive temperature coefficient current source is electrically connected with the first end of the first operational amplifier circuit; the second end of the first operational amplifier circuit is electrically connected with the second end of the power tube driving circuit; the third end of the first operational amplifier circuit is electrically connected with the first end of the load feedback circuit; the fourth end of the first operational amplifier circuit is used for connecting a reference voltage; the fifth end of the first operational amplifier circuit is used for grounding.
3. The voltage regulator circuit of claim 1, wherein the reference voltage circuit comprises a 2T temperature complementary structure circuit and an error amplification circuit;
the 2T temperature complementary structure circuit comprises a first N-type tube (NMOS 1) and a second N-type tube (NNT 2); the error amplifying circuit comprises the first N-type tube (NMOS 1), a first resistor (R1) and a first capacitor (C1);
a first end of the second N-type tube (NNT 2) is electrically connected with a first end of the power circuit; the first end of the first N-type tube (NMOS 1) is electrically connected with the second end of the second N-type tube (NNT 2), the third end of the second N-type tube (NNT 2), the first end of the first resistor (R1) and the second end of the power tube driving circuit respectively; the second end of the first N-type tube (NMOS 1) is electrically connected with the first end of the load feedback circuit; a second end of the first resistor (R1) is electrically connected with a first end of the first capacitor (C1); the third end of the first N-type tube (NMOS 1) is used for being grounded; the second end of the first capacitor (C1) is used for grounding.
4. The voltage regulator circuit of claim 1, wherein the power tube drive circuit comprises a second op-amp circuit and a voltage controlled variable current source;
wherein a first end of the voltage-controlled variable current source is electrically connected with a first end of the power supply circuit; the second end of the voltage-controlled variable current source is electrically connected with the first end of the second operational amplifier circuit; the second end of the second operational amplifier circuit is electrically connected with the second end of the reference voltage circuit; the third end of the second operational amplifier circuit is electrically connected with the third end of the output power stage circuit; the fourth end of the second operational amplifier circuit is used for grounding.
5. The voltage regulator circuit of claim 1, wherein the power transistor drive circuit comprises a second resistor (R2), a first P-type transistor (PMOS 1), a third N-type transistor (NMOS 2);
wherein: a first end of the second resistor (R2) is electrically connected with a first end of the power supply circuit; the second resistor (R2) is electrically connected with the first end of the first P-type tube (PMOS 1); the second end of the first P-type tube (PMOS 1) is electrically connected with the third end of the first P-type tube (PMOS 1), the first end of the third N-type tube (NMOS 2) and the third end of the output power stage circuit respectively; a second end of the third N-type tube (NMOS 2) is electrically connected with a second end of the reference voltage circuit; the third end of the third N-type tube (NMOS 2) is used for grounding.
6. The voltage regulator circuit of claim 1, wherein the load feedback circuit comprises a third resistor (R3), a fourth resistor (R4), and a second Capacitor (CL);
wherein: a first end of the third resistor (R3) is electrically connected with a second end of the output power stage circuit and a first end of the second Capacitor (CL) respectively; the second end of the third resistor (R3) is electrically connected with the first end of the fourth resistor (R4) and the third end of the reference voltage circuit respectively; a second end of the second Capacitor (CL) is used for grounding; the second end of the fourth resistor (R4) is used for grounding.
7. The voltage regulator circuit of claim 6, wherein the output power stage circuit comprises a second P-type tube (PMOS 2);
a first end of the second P-type tube (PMOS 2) is electrically connected with a first end of the power supply circuit; the second end of the second P-type tube (PMOS 2) is electrically connected with the third end of the power tube driving circuit; the third end of the second P-type tube (PMOS 2) is electrically connected with the first end of the third resistor (R3) and the first end of the second Capacitor (CL) respectively.
8. The voltage regulator circuit of claim 1, wherein the reload detection circuit comprises a fourth N-type tube (NNT 1), a fifth N-type tube (NMOS 3), and an Inverter (INV);
wherein: a first end of the fourth N-type tube (NNT 1) is electrically connected with a first end of the power circuit; the second end of the fourth N-type tube (NNT 1) is electrically connected with the third end of the fourth N-type tube (NNT 1), the first end of the fifth N-type tube (NMOS 3) and the first end of the Inverter (INV) respectively; a second end of the fifth N-type tube (NMOS 3) is electrically connected with a second end of the reference voltage circuit; a second end of the Inverter (INV) is electrically connected with a fifth end of the power tube driving circuit; the third end of the fifth N-type tube (NMOS 3) is used for grounding.
9. An electronic device comprising the voltage regulator circuit of any one of claims 1-8.
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| CN202210136694.6A CN114527820B (en) | 2022-02-15 | 2022-02-15 | Voltage stabilizer circuit and electronic equipment |
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| CN202210136694.6A CN114527820B (en) | 2022-02-15 | 2022-02-15 | Voltage stabilizer circuit and electronic equipment |
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| CN101122804A (en) * | 2007-09-07 | 2008-02-13 | 北京时代民芯科技有限公司 | Low-voltage-difference voltage-stablizer |
| CN111522389A (en) * | 2020-04-01 | 2020-08-11 | 博流智能科技（南京）有限公司 | Wide-input low-dropout linear voltage stabilizing circuit |
| CN213581884U (en) * | 2020-12-25 | 2021-06-29 | 唐太平 | Load current switching quick response LDO circuit |
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| US7656224B2 (en) * | 2005-03-16 | 2010-02-02 | Texas Instruments Incorporated | Power efficient dynamically biased buffer for low drop out regulators |
| US8471539B2 (en) * | 2010-12-23 | 2013-06-25 | Winbond Electronics Corp. | Low drop out voltage regulato |
| US8917070B2 (en) * | 2013-03-14 | 2014-12-23 | Vidatronic, Inc. | LDO and load switch supporting a wide range of load capacitance |
| JP2016162097A (en) * | 2015-02-27 | 2016-09-05 | 株式会社東芝 | Power supply circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122804A (en) * | 2007-09-07 | 2008-02-13 | 北京时代民芯科技有限公司 | Low-voltage-difference voltage-stablizer |
| CN111522389A (en) * | 2020-04-01 | 2020-08-11 | 博流智能科技（南京）有限公司 | Wide-input low-dropout linear voltage stabilizing circuit |
| CN213581884U (en) * | 2020-12-25 | 2021-06-29 | 唐太平 | Load current switching quick response LDO circuit |
| CN113342111A (en) * | 2021-06-21 | 2021-09-03 | 南京微盟电子有限公司 | Quick response circuit applied to low-power LDO |
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