CN115826662A - Linear regulator and electronic device - Google Patents
Linear regulator and electronic device Download PDFInfo
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- CN115826662A CN115826662A CN202310028985.8A CN202310028985A CN115826662A CN 115826662 A CN115826662 A CN 115826662A CN 202310028985 A CN202310028985 A CN 202310028985A CN 115826662 A CN115826662 A CN 115826662A
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Abstract
The invention provides a linear voltage stabilizer and electronic equipment, relating to the technical field of electronic circuits, wherein the linear voltage stabilizer comprises: the starting circuit, the transient enhancement circuit and the output circuit are connected in sequence; the starting circuit is used for providing a starting voltage, and the transient enhancement circuit is used for transmitting the starting voltage so as to output an output voltage corresponding to the starting voltage through the output circuit; the transient enhancement circuit is also used for carrying out rapid output control on the output voltage when the output voltage fluctuates so as to enable the output voltage to carry out stable output. The linear voltage stabilizer and the electronic equipment provided by the invention can be started before the reference level is not established so as to ensure the normal work of the linear voltage stabilizer, and the introduced transient enhancement circuit can greatly improve the load response speed of the linear voltage stabilizer, so that the linear voltage stabilizer not only can be suitable for various application scenes, but also has high efficiency.
Description
Technical Field
The present invention relates to the field of electronic circuits, and in particular, to a linear regulator and an electronic device.
Background
The power supply scheme is the problem that electronic equipment faces first, and civil 220V alternating current or industrial 380V alternating current generally needs voltage reduction and alternating current-direct current conversion processing before the electronic equipment can be safely supplied with power. For a chip inside an electronic device, direct current power supply is generally used, and may be low voltage power supply, such as within 5V, or high voltage power supply, such as 24V, 36V, and the like, and if the chip is high voltage power supply, the chip needs to integrate a linear regulator to obtain a relatively stable output voltage for internal use.
The linear voltage regulator generally comprises a feedback circuit, an error amplifier, a power tube and a compensation circuit. According to practical application requirements, the performance of the linear regulator has different emphasis points, such as high precision, low noise, high power supply rejection ratio, fast response speed, and the like, however, the conventional linear regulator generally needs a reference level to be used normally, and in some items, there may be situations where the reference level cannot be provided or the reference level is inaccurate, and when there is a large change in the power supply or the load instantaneously, the output voltage of the linear regulator may also change, and it is difficult to perform stable output.
Disclosure of Invention
Accordingly, the present invention is directed to a linear regulator and an electronic device to alleviate the above-mentioned problems.
In a first aspect, an embodiment of the present invention provides a linear regulator, including: the starting circuit, the transient enhancement circuit and the output circuit are connected in sequence; the starting circuit is used for providing a starting voltage, and the transient enhancement circuit is used for transmitting the starting voltage so as to output an output voltage corresponding to the starting voltage through the output circuit; the transient enhancement circuit is used for carrying out output regulation on the output voltage when the fluctuation of the output voltage exceeds a preset threshold value so as to enable the output voltage to carry out stable output.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the starting circuit includes a voltage generating circuit and a starting power tube; the input end of the voltage generating circuit is used for being connected with an external power supply and providing the starting voltage; the output end of the voltage generating circuit is connected with the grid electrode of the starting power tube, the drain electrode of the starting power tube is connected with the output circuit, and the source electrode of the starting power tube is connected with the transient enhancement circuit; the voltage generating circuit is used for generating a voltage signal, the voltage signal generates the starting voltage through the starting power tube, and the starting voltage is transmitted to the output circuit through the transient enhancement circuit to be output.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the voltage generating circuit includes a current source and a regulating resistor connected in series with the current source; the output end of the voltage generating circuit is arranged on the connection point of the current source and the adjusting resistor.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the output circuit includes an adjustment power transistor, a pull-down circuit, and an output interface; the grid electrode of the adjusting power tube is connected with the drain electrode of the starting power tube, the source electrode of the adjusting power tube is connected with the external power supply, and the drain electrode of the adjusting power tube is connected to the output interface; one end of the pull-down circuit is connected with the drain electrode of the adjusting power tube, and the other end of the pull-down circuit is grounded.
With reference to the third possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the transient boost circuit includes a first current mirror and a second current mirror; the first current mirror comprises a plurality of first power tubes; the grid electrodes of the first power tubes are connected with the grid electrodes of the starting power tubes; the drains of the first power tubes are connected with the second current mirror; the source electrodes of the first power tubes are connected with the output interface; the second current mirror comprises a plurality of second power tubes; the grid electrodes of the second power tubes are connected with preset current sources, and the preset current sources are connected with an external power supply; the drain electrodes of the second power tubes are connected with the first current mirror; the source electrodes of the second power tubes are all grounded.
With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the output circuit further includes a clamp power transistor; the drain electrode of the clamping power tube is connected with the source electrode of the starting power tube, and the drain electrode of the clamping power tube and the source electrode of the starting power tube are also connected to two second power tubes in the second current mirror through a turn-off power tube.
With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where one of the power transistors of the first current mirror and one of the power transistors of the second current mirror form a first current comparator; the first current comparator is provided with a first output point, and the first output point is connected with the grid of the turn-off power tube.
With reference to the fourth possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where one of the power transistors of the first current mirror and one of the power transistors of the second current mirror constitute a second current comparator; the power tube forming the second current comparator is different from the power tube forming the first current comparator; the second current comparator is also provided with a second output point, and the second output point is connected with the grid electrode of the second turn-off power tube; the drain electrode of the second turn-off power tube is connected with the external power supply and used for charging the grid electrode of the adjusting power tube; and the source electrode of the second turn-off power tube is connected with the ground.
With reference to the third possible implementation manner of the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, where the linear regulator further includes an operational amplifier feedback regulation loop; the operational amplifier feedback regulation loop is provided with an operational amplifier chip, and one input end of the operational amplifier chip is connected to the output interface so as to obtain a feedback voltage corresponding to the output voltage; the other input end of the operational amplifier chip is used for acquiring a preset reference voltage; the output end of the operational amplifier chip is connected to the starting circuit so as to adjust the output voltage of the starting circuit.
In a second aspect, an embodiment of the present invention further provides an electronic device, where the electronic device is configured with the linear regulator according to the first aspect.
The embodiment of the invention has the following beneficial effects:
the linear voltage regulator and the electronic equipment provided by the embodiment of the invention can provide the starting voltage through the starting circuit, and transmit the starting voltage through the transient enhancement circuit so as to output the output voltage corresponding to the starting voltage through the output circuit; and the transient enhancement circuit can also output and regulate the output voltage when the fluctuation of the output voltage exceeds a preset threshold value so as to enable the output voltage to be stably output, the starting circuit can finish starting before the reference level is not established so as to ensure the normal work of the linear voltage stabilizer, and the introduced transient enhancement circuit can greatly improve the load response speed of the linear voltage stabilizer, so that the linear voltage stabilizer can be suitable for various application scenes, and the use efficiency of the linear voltage stabilizer is also improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a linear regulator according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a linear regulator according to an embodiment of the present invention;
fig. 3 is a circuit diagram of another linear regulator according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, in chip design, the range of power supply voltage is wide, and the power supply voltage cannot be directly used for power supply of devices inside a chip, so that a circuit module is needed to convert voltage changing in a large range from the outside into relatively stable low-voltage power supply voltage inside, and a linear voltage regulator is a module for realizing the function.
Generally, a linear regulator needs a reference level to operate normally, but in practical terms, there may be situations that the reference level cannot be provided, or the reference level may be inaccurate, and so on, and therefore, a linear regulator which can be started up independently and operate normally is needed.
Further, the transient response characteristic is an important index of the linear regulator. In a high-current voltage regulator with a P-type power tube as an output, if a dominant pole is at a GATE electrode end of the power tube, the bandwidth of a loop is necessarily very small, and the response speed of the loop is very slow. Therefore, a transient response enhancement circuit is required to be added in the voltage stabilizing circuit, so that the transient characteristic of the error amplification loop is enhanced when the response of the error amplification loop is not completed, and the output voltage of the linear voltage stabilizer is helped to be quickly restored to the normal output voltage.
Therefore, the linear voltage regulator and the electronic device provided by the embodiment of the invention can realize no-reference-voltage starting, and can also quickly respond to the change of the output voltage of the linear voltage regulator so as to improve the overall stability.
For the sake of understanding the present embodiment, a linear regulator disclosed in the present embodiment will be described in detail first.
In a possible implementation manner, an embodiment of the present invention provides a linear voltage regulator, as shown in a structural block diagram of a linear voltage regulator shown in fig. 1, where the linear voltage regulator in the embodiment of the present invention includes: the starting circuit 10, the transient enhancement circuit 20 and the output circuit 30 are connected in sequence.
The starting circuit 10 is configured to provide a starting voltage, and the transient enhancement circuit 20 is configured to transmit the starting voltage so as to output an output voltage corresponding to the starting voltage through the output circuit 30.
Further, the transient enhancement circuit 20 is further configured to perform output control on the output voltage when the fluctuation of the output voltage exceeds a preset threshold value, so that the output voltage is stably output.
The linear voltage regulator provided by the embodiment of the invention can provide the starting voltage through the starting circuit, and transmit the starting voltage through the transient enhancement circuit so as to output the output voltage corresponding to the starting voltage through the output circuit; and the transient enhancement circuit can also output and regulate the output voltage when the fluctuation of the output voltage exceeds a preset threshold value so as to enable the output voltage to be stably output, the starting circuit can finish starting before the reference level is not established so as to ensure the normal work of the linear voltage stabilizer, and the introduced transient enhancement circuit can greatly improve the load response speed of the linear voltage stabilizer, so that the linear voltage stabilizer can be suitable for various application scenes, and the use efficiency of the linear voltage stabilizer is also improved.
In actual use, the starting circuit 10 includes a voltage generating circuit and a starting power tube; the input end of the voltage generating circuit is used for being connected with an external power supply and providing starting voltage; the output end of the voltage generating circuit is connected with the grid electrode of the starting power tube, the drain electrode of the starting power tube is connected with the output circuit 30, and the source electrode of the starting power tube is connected with the transient enhancement circuit.
The voltage generating circuit is used for generating a voltage signal, the voltage signal generates starting voltage through the starting power tube, and the starting voltage is transmitted to the output circuit through the transient enhancement circuit to be output.
For easy understanding, fig. 2 further shows a circuit schematic diagram of a linear regulator on the basis of fig. 1, and as shown in fig. 2, shows a start circuit, a transient enhancement circuit and an output circuit, and a voltage generation circuit and a start power tube which are included in the start circuit, wherein in fig. 2, the power tube M7 is a start power tube, further, in fig. 2, the voltage generation circuit includes a current source I1 and a regulating resistor which is connected in series with the current source I1, wherein in the embodiment of the present invention, the regulating resistor is formed by two resistors which are connected in series, that is, resistors R3 and R4 in fig. 2, and an output end of the voltage generation circuit is disposed at a connection point of the current source and the regulating resistor.
Further, as shown in fig. 2, the output circuit includes an adjustment power transistor, a pull-down circuit and an output interface; the power transistor M24 in fig. 2 is a regulation power transistor, the pull-down circuit includes resistors R5 and R6 connected in series, and a connection point between the drain of the regulation power transistor M24 and the pull-down circuit is the output interface VOUT.
Specifically, the gate of the adjustment power tube M24 is connected to the drain of the start power tube M7, the source of the adjustment power tube M24 is connected to the external power source VCC, and the drain of the adjustment power tube M24 is connected to the output interface; one end of the pull-down circuit is connected with the drain electrode of the adjusting power tube M24, and the other end of the pull-down circuit is grounded.
Further, in fig. 2, the transient enhancement circuit includes a first current mirror and a second current mirror; the first current mirror comprises a plurality of first power tubes, namely, power tubes M8, M19, M20 and M21, and the grid electrodes of the plurality of first power tubes are connected with the grid electrode of the starting power tube M7; the drain electrodes of the first power tubes are connected with the second current mirror; the source electrodes of the first power tubes are connected with the output interface.
Further, the second current mirror comprises a plurality of second power tubes, namely power tubes M9, M10, M11, M12 and M13; the grid electrodes of the second power tubes are connected with a preset current source, and the preset current source is connected with an external power supply; the drain electrodes of the second power tubes are connected with the first current mirror; the source electrodes of the second power tubes are all grounded.
Further, the output circuit further includes a clamp power transistor, i.e., a clamp power transistor M8 in fig. 2; the drain of the clamp power transistor is connected to the source of the start-up power transistor M7, and the drain of the clamp power transistor M8 and the source of the start-up power transistor M7 are also connected to two second power transistors in the second current mirror, i.e., M10 and M11 in fig. 2, through the turn-off power transistor M18.
Based on the circuit schematic diagram of the linear regulator shown in fig. 2, when starting without reference voltage, as long as an initial bias current I1 flows through the resistors R3 and R4, a fixed voltage V _ GATE, i.e. the above-mentioned starting voltage of the embodiment of the present invention, can be obtained, and at the same time, the current sources I2 and I3 can be obtained by mirroring the current of I1. When the start-up power tube M7 is not turned on, the source of the start-up power tube M7 is pulled down to GND and grounded, at this time, if V _ GATE exceeds the threshold voltage of the start-up power tube M7, the GATE of the regulation power tube M24 is pulled down, and finally, the output voltage VOUT of the output interface is clamped at V _ GATE + VGS (M8) by the clamping power tube M8, so that the stable output process of the output voltage VOUT can be realized without a reference voltage.
Furthermore, one of the power tubes of the first current mirror and one of the power tubes of the second current mirror form a first current comparator; the first current comparator is provided with a first output point, and the first output point is connected with the grid of the turn-off power tube M18.
Specifically, in fig. 2, the power transistor M19 of the first current mirror and the power transistor M12 of the second current mirror form a first current comparator, and when the current of the power transistor M19 is stronger than that of the power transistor M12, the output level at the point a of the first output point is high level, otherwise, the output level is low level.
Furthermore, one power tube of the first current mirror and one power tube of the second current mirror form a second current comparator; the power tube forming the second current comparator is different from the power tube forming the first current comparator; specifically, the power transistor M21 of the first current mirror and the power transistor M13 of the second current mirror constitute a second current comparator, and the second current comparator is further provided with a second output point, i.e., a point B in fig. 2, which is connected to the gate of the second turn-off power transistor M17; the drain of the second turn-off power tube M17 is connected to an external power supply, and is used for charging the gate of the adjustment power tube M24; the source of the second turn-off power tube M17 is connected to ground, wherein, the drain of the second turn-off power tube M17 is also provided with power tube groups M22 and M23, which are connected to the external power supply through the power tube groups M22 and M23, and the source of the second turn-off power tube M17 is also provided with power tube groups M14 and M15, which are connected to ground through the power tube groups M14 and M15; the second output point B is also connected to a power tube M16, the gate of the power tube M16 is connected to the second output point B, the source is grounded, and the drain is connected to the output interface VOUT.
Further, based on the circuit diagram of the linear regulator shown in fig. 2, when the initial bias current I1 has an initial current flowing through the resistors R3 and R4, a fixed voltage V _ GATE is generated, and in normal operation, the output voltage VOUT is clamped at a fixed value (VOUT = V _ GATE + VGS _ M8) by the VGS and V _ GATE voltages of the clamping power transistor M8, which is the designed output voltage value of the linear regulator, i.e., the set value, and the set value of the output voltage can be adjusted by adjusting the initial current I1 or adjusting the resistances of the resistors R3 and R4.
When the supply voltage (external power supply) VCC is higher than the set value, the output voltage of the linear regulator is the set value, when the supply voltage is lower than the set value, the current of the clamping power tube M8 disappears, the current of the starting power tube M7 increases, then the starting power tube M7 pulls down the GATE of the adjusting power tube M24, the adjusting power tube M24 works in a linear region, and at this time, the output voltage VOUT is approximately equal to VCC.
In addition, in practical use, the start power transistor M7, the second off power transistor M17, and the regulation power transistor M24 in fig. 2 are high-voltage transistors, so that the input voltage of the linear regulator in the embodiment of the present invention may range from 2.5V to the maximum withstand voltage of the high-voltage transistor.
Further, based on the circuit schematic diagram of the linear regulator shown in fig. 2, when the transient enhancement circuit performs output control on the output voltage, the transient enhancement function can be implemented, and the specific principle is as follows:
in fig. 2, power transistors M8, M19, M20, M21 form a first current mirror, where current I _ M8= I _ M10+ I _ M18-I _ M7 of M8, where I _ M10, I _ M18, I _ M7 respectively represent currents of M10, M18, and M7, and power transistors M9, M10, M11, M12, M13 form a second current mirror for providing bias. The power transistor M12 and the power transistor M19 form a first current comparator, and when the current of the power transistor M19 is higher than that of the power transistor M12, the output level at the first output point a is high, and vice versa. The power transistor M21 and the power transistor M13 constitute a second current comparator. In a steady state, the pull-down current of the power tube M12 is weaker than that of the power tube M19, the point a of the first output point is at a high level, the turn-off power tube M18 is in a turn-off state at this time, the pull-down current of the power tube M13 is higher than that of the power tube M21, the point B of the second output point is at a low level, and the second turn-off power tube M17 is in a turn-off state. If the voltage VOUT suddenly rises, because V _ GATE is relatively stable, VGS of the first power transistor in the first current mirror where the clamp power transistor M8 is located will increase instantaneously, and there are three loops to regulate the voltage VOUT:
the first loop comprises a clamping power tube M8, a starting power tube M7 and a regulating power tube M24, wherein after the current of the clamping power tube M8 is increased, the current of the starting power tube M7 is reduced, I3 pulls the GATE of the regulating power tube M24 high, so that the current flowing on the regulating power tube M24 is reduced, and finally the output voltage VOUT gradually falls back to a set value (VOUT = V _ GATE + VGS _ M8);
the second loop circuit comprises a power tube M21, a second turn-off power tube M17, power tubes M22 and M23 and an adjusting power tube M24, wherein after the current of the power tube M21 is increased, the point B is increased, the second turn-off power tube M17 is opened, and then the GATE of the adjusting power tube M24 is charged through the power tubes M22 and M23 to be quickly increased;
the third loop includes a power transistor M21 and a power transistor M16, where the power transistor M16 in the pull-down circuit directly pulls down to bleed off the output voltage VOUT.
The regulation speed of the first loop is directly related to the current magnitude of I3, and in general, I3 is not too large, because too large can affect the recovery speed of the output voltage VOUT after undershooting, therefore, the current path controlled by the second turn-off power transistor M17 can speed up the overshoot recovery speed of the output voltage VOUT.
Similarly, if the output voltage VOUT suddenly decreases, the currents of the clamping power tube M8 and the clamping power tube M19 decrease, the voltage at the point a decreases to open the turn-off power tube M18, the current of the start-up power tube M7 increases by several times, and then the GATE of the regulation power tube M24 is pulled down rapidly, so as to increase the current of the regulation power tube M24 and restore the voltage of the output voltage VOUT, so that the control loop of the turn-off power tube M18 can effectively accelerate the recovery speed of the undershoot of VOUT, thereby implementing the function of transient enhancement of the circuit.
In practical use, in the transient enhancement process, the current of the loop where the turn-off power transistor M18 and the second turn-off power transistor M17 are located is controlled by the second current mirror, and in practical use, the second current mirror may be removed, that is, the sources of the turn-off power transistor M18 and the second turn-off power transistor M17 may be directly grounded, or may be grounded through a current-limiting resistor, which is specifically set according to practical use conditions.
Further, the adjusting resistor of the voltage generating circuit is formed by two resistors R3 and R4 connected in series, and may provide a voltage signal, and in actual use, the resistors R3 and R4 in the adjusting resistor may also be replaced by another device having a clamping function, which may be specifically set according to an actual use situation, which is also not limited in the embodiment of the present invention.
Further, the linear regulator provided by the embodiment of the invention can also be provided with an operational amplifier feedback regulation loop.
Specifically, the operational amplifier feedback regulation loop is provided with an operational amplifier chip, and one of input ends of the operational amplifier chip is connected to an output interface of the output circuit 30 to obtain a feedback voltage corresponding to the output voltage; the other input end of the operational amplifier chip is used for acquiring a preset reference voltage; the output end of the operational amplifier chip is connected to the starting circuit so as to adjust the output voltage of the starting circuit.
Because this feedback regulation loop is put to fortune only lets output voltage variation range littleer, consequently, when the in-service use, feedback regulation loop is put to fortune in the linear voltage regulator can omit, and of course, in other embodiments, the feedback regulation loop is put to fortune can remain, keeps voltage generating circuit and feedback regulation loop is put to fortune simultaneously in the linear voltage regulator promptly to guarantee the normal start-up of linear voltage regulator, make the output more accurate.
For ease of understanding, fig. 3 shows a circuit schematic of another linear regulator, wherein a schematic of an operational amplifier feedback regulation loop is shown in fig. 3. Compared with fig. 2, the specific circuit structure of the current sources I1 to I3 is shown in the embodiment shown in fig. 3, the power tubes M1 to M3 and the resistors R1 and R2 form a current generating circuit, the power tubes M4 to M6 respectively mirror the current of the power tube M3, and the obtained current is supplied to the circuit components connected thereto. Specifically, in the current generating circuit, one end of the resistor R2 is connected to VCC, the other end is connected to the drain of the power tube M1, the source of the power tube M1 is grounded, the drain is connected to one end of the resistor R1, the other end of the resistor R1 is grounded, the gate of the power tube M2 is connected to the drain of the power tube M1, the source of the power tube M2 is connected to one end of the resistor R1, the drain of the power tube M2 is connected to the drain of the power tube M3, the source of the power tube M3 is connected to VCC, and the gate of the power tube M3 is connected to a current mirror formed by the power tubes M4-M6.
Specific types and connection modes of the power tubes can refer to a circuit diagram shown in fig. 3, it should be understood that the current generation circuit shown in fig. 3 is only one possible implementation manner in the embodiment of the present invention, in other embodiments, specific types of the current generation circuit, and types and parameters of each power tube and other devices may be set according to actual use situations, and the embodiment of the present invention is not limited thereto.
Specifically, in fig. 3, the operational amplifier chip is represented as an OTA, a positive phase input end of the operational amplifier chip is used for obtaining a preset reference voltage, and a negative phase input end of the operational amplifier chip is connected to the output interface, specifically, in fig. 3, the negative phase input end is directly connected to the pull-down circuit, and the output voltage is divided by the resistors R5 and R6, so as to obtain a voltage value obtained after the output voltage is divided as a corresponding feedback voltage.
At this time, the operational amplifier chip OTA can clamp VOUT at a fixed value according to the reference voltage and the feedback voltage.
And if no other power supply exists in the circuit, the power supply of the operational amplifier chip OTA and the reference voltage is VOUT, so that the operational amplifier chip OTA and the reference voltage do not work normally at the time of starting. If the output terminal of the operational amplifier chip OTA is directly connected to V _ GATE, i.e. the GATE of the power transistor is turned on, the whole linear voltage regulator may fail to be turned on due to the leakage of the output terminal of the operational amplifier chip OTA when the current is small.
In the circuit diagram of the operational amplifier feedback regulation loop shown in fig. 3, even if the operational amplifier chip OTA does not work normally yet, that is, the output of the operational amplifier chip OTA is at least 0, the voltage regulator can be started normally as long as it is ensured that the V _ GATE generated by the initial current flowing through the resistor R3 can turn on the start power transistor M7.
In summary, the linear regulator provided in the embodiment of the present invention can greatly increase the load response speed of the linear regulator by introducing the transient enhancement circuit. Moreover, the linear regulator provided by the embodiment of the invention can adapt to a wider input voltage range, when the input voltage is less than or equal to the set output voltage, the actual output voltage of the linear regulator is approximately equal to the input voltage, and when the input voltage is greater than the set output voltage, the output of the linear regulator is equal to the set voltage.
Further, an embodiment of the present invention further provides an electronic device, where the electronic device is configured with the linear regulator provided in the above embodiment.
The electronic device provided by the embodiment of the invention has the same technical characteristics as the linear voltage regulator provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the electronic device described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A linear regulator, comprising: the starting circuit, the transient enhancement circuit and the output circuit are connected in sequence;
the starting circuit is used for providing a starting voltage, and the transient enhancement circuit is used for transmitting the starting voltage so as to output an output voltage corresponding to the starting voltage through the output circuit;
the transient enhancement circuit is used for carrying out output regulation on the output voltage when the fluctuation of the output voltage exceeds a preset threshold value so as to enable the output voltage to carry out stable output.
2. The linear regulator of claim 1, wherein the start-up circuit comprises a voltage generation circuit and a start-up power transistor;
the input end of the voltage generating circuit is used for being connected with an external power supply and providing the starting voltage;
the output end of the voltage generating circuit is connected with the grid electrode of the starting power tube, the drain electrode of the starting power tube is connected with the output circuit, and the source electrode of the starting power tube is connected with the transient enhancement circuit;
the voltage generating circuit is used for generating a voltage signal, the voltage signal generates the starting voltage through the starting power tube, and the starting voltage is transmitted to the output circuit through the transient enhancement circuit to be output.
3. The linear regulator of claim 2, wherein the voltage generation circuit includes a current source and a regulating resistor in series with the current source;
the output end of the voltage generating circuit is arranged on the connection point of the current source and the adjusting resistor.
4. The linear regulator of claim 2, wherein the output circuit comprises a regulation power transistor, a pull-down circuit, and an output interface;
the grid electrode of the adjusting power tube is connected with the drain electrode of the starting power tube, the source electrode of the adjusting power tube is connected with the external power supply, and the drain electrode of the adjusting power tube is connected to the output interface;
one end of the pull-down circuit is connected with the drain electrode of the adjusting power tube, and the other end of the pull-down circuit is grounded.
5. The linear regulator of claim 4, wherein the transient enhancement circuit comprises a first current mirror and a second current mirror;
the first current mirror comprises a plurality of first power tubes;
the grid electrodes of the first power tubes are connected with the grid electrodes of the starting power tubes; the drains of the first power tubes are connected with the second current mirror; the source electrodes of the first power tubes are connected with the output interface;
the second current mirror comprises a plurality of second power tubes;
the grid electrodes of the second power tubes are connected with preset current sources, and the preset current sources are connected with an external power supply;
the drain electrodes of the second power tubes are connected with the first current mirror; the source electrodes of the second power tubes are all grounded.
6. The linear regulator of claim 5, wherein the output circuit further comprises a clamp power transistor;
the drain electrode of the clamping power tube is connected with the source electrode of the starting power tube, and the drain electrode of the clamping power tube and the source electrode of the starting power tube are also connected to two second power tubes in the second current mirror through a turn-off power tube.
7. The linear regulator of claim 6, wherein one of the power transistors of the first current mirror and one of the power transistors of the second current mirror form a first current comparator;
the first current comparator is provided with a first output point, and the first output point is connected with the grid of the turn-off power tube.
8. The linear regulator of claim 7, wherein one of the power transistors of the first current mirror and one of the power transistors of the second current mirror form a second current comparator; the power tube forming the second current comparator is different from the power tube forming the first current comparator;
the second current comparator is also provided with a second output point, and the second output point is connected with the grid electrode of the second turn-off power tube;
the drain electrode of the second turn-off power tube is connected with the external power supply and used for charging the grid electrode of the adjusting power tube;
and the source electrode of the second turn-off power tube is connected with the ground.
9. The linear regulator of claim 4, further comprising an operational amplifier feedback regulation loop;
the operational amplifier feedback regulation loop is provided with an operational amplifier chip, and one input end of the operational amplifier chip is connected to the output interface so as to obtain a feedback voltage corresponding to the output voltage;
the other input end of the operational amplifier chip is used for acquiring a preset reference voltage;
the output end of the operational amplifier chip is connected to the starting circuit so as to adjust the output voltage of the starting circuit.
10. An electronic device, characterized in that the electronic device is provided with the linear regulator according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310028985.8A CN115826662A (en) | 2023-01-09 | 2023-01-09 | Linear regulator and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310028985.8A CN115826662A (en) | 2023-01-09 | 2023-01-09 | Linear regulator and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115826662A true CN115826662A (en) | 2023-03-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310028985.8A Pending CN115826662A (en) | 2023-01-09 | 2023-01-09 | Linear regulator and electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115826662A (en) |
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2023
- 2023-01-09 CN CN202310028985.8A patent/CN115826662A/en active Pending
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