A voltage stabilizing power supply circuit

Abstract

This utility model discloses a regulated power supply circuit. The circuit includes: a power supply module, an LDO module, an output adjustment module, and an output feedback module; the input terminals of the power supply module and the LDO module are electrically connected; the output terminal of the LDO module is electrically connected to the control terminal of the output adjustment module; the power supply module is also electrically connected to the input terminal of the output adjustment module; the output terminal of the output adjustment module is electrically connected to the input terminal of the output feedback module; the output terminal of the output feedback module is electrically connected to the feedback terminal of the LDO module; the output feedback module detects the real-time voltage signal output by the output adjustment module and feeds it back to the LDO module; the LDO module adjusts its output voltage control signal to the output adjustment module according to the real-time voltage signal; the output adjustment module, under the voltage control signal of the LDO module, stably outputs the voltage signal from the power supply module; wherein, the parameters of the output adjustment module are adjustable to make the output current of the regulated power supply circuit adjustable.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a voltage regulator circuit. Background Technology

[0002] In some circuit or system power supply applications, a stable supply voltage is generally required, as well as low noise in the regulated voltage. Low dropout linear regulated power supplies (LDOs) are a commonly used electronic device in electronic systems, and they are widely used in various low-power (i.e., small-size) circuit systems.

[0003] Currently, low dropout linear regulated power supplies (LDOs) have relatively small output current, making them unsuitable for applications requiring high output current, thus limiting their application needs. Utility Model Content

[0004] This invention provides a voltage regulator circuit that, in addition to achieving a regulated output voltage, uses a small-current LDO module to control the voltage regulator circuit to output a larger current.

[0005] To achieve the above objectives, this utility model provides a voltage regulator circuit, which includes: a power supply module, an LDO module, an output adjustment module, and an output feedback module.

[0006] The power supply module is electrically connected to the input terminal of the LDO module; the output terminal of the LDO module is electrically connected to the control terminal of the output adjustment module; the power supply module is electrically connected to the input terminal of the output adjustment module; the output terminal of the output adjustment module is electrically connected to the input terminal of the output feedback module; the output terminal of the output feedback module is electrically connected to the feedback terminal of the LDO module.

[0007] The output feedback module is used to detect the voltage signal output by the output adjustment module in real time and feed it back to the LDO module; the LDO module is used to adjust the output adjustment signal to the output adjustment module according to the voltage signal; the output adjustment module is used to convert the input voltage signal output by the power module into a stable output voltage signal under the adjustment signal of the LDO module.

[0008] The parameters of the output adjustment module are adjustable so that the output current of the regulated power supply circuit is adjustable.

[0009] Optionally, the output adjustment module includes: an output start unit and an output control unit;

[0010] The input terminal of the output start unit serves as the control terminal of the output adjustment module and is electrically connected to the output terminal of the LDO module; the output terminal of the output start unit is electrically connected to the control terminal of the output control unit; the input terminal of the output control unit serves as the input terminal of the output adjustment module and is electrically connected to the power module; the output terminal of the output control unit serves as the output terminal of the output adjustment module and is electrically connected to the input terminal of the output feedback module.

[0011] Optionally, the output activation unit includes: a first transistor, a first resistor, and a second resistor;

[0012] The first end of the first resistor is electrically connected to the output terminal of the LDO module; the second end of the first resistor is electrically connected to the first end of the second resistor and the control terminal of the first transistor; the second end of the second resistor and the second end of the first transistor are grounded; the first end of the first transistor is electrically connected to the input terminal of the output control unit.

[0013] Optionally, the output start-up unit further includes: a first filter capacitor; a first terminal of the first filter capacitor is electrically connected to a first terminal of the first resistor; and a second terminal of the first filter capacitor is grounded.

[0014] Optionally, the output control unit includes: a second transistor and a first pull-up resistor;

[0015] The control terminal of the second transistor is electrically connected to the output terminal of the output start-up unit and the first terminal of the first pull-up resistor; the first terminal of the second transistor is electrically connected to the second terminal of the first pull-up resistor and the power supply module; the second terminal of the second transistor is electrically connected to the output feedback module.

[0016] Optionally, the output feedback module includes: a first voltage divider resistor and a second voltage divider resistor; a first end of the first voltage divider resistor is electrically connected to the output end of the output adjustment module; a second end of the first voltage divider resistor is electrically connected to the feedback end of the LDO module; the second end of the first voltage divider resistor is also electrically connected to the first end of the second voltage divider resistor; and the second end of the second voltage divider resistor is grounded.

[0017] Optionally, the power module includes a power input body and an input filtering unit; the power input body is electrically connected to the input terminal of the input filtering unit, the input terminal of the LDO module, and the input terminal of the output adjustment module.

[0018] The output terminal of the input filter unit is grounded.

[0019] Optionally, the circuit further includes: a linear voltage regulator module; the input terminal of the linear voltage regulator module is electrically connected to the output terminal of the power supply module; the output terminal of the linear voltage regulator module is electrically connected to the input terminal of the LDO module.

[0020] Optionally, the linear regulator module includes: a third resistor, a first Zener diode, a third transistor, and a first capacitor;

[0021] The first end of the third resistor is electrically connected to the output end of the power output module; the second end of the third resistor is electrically connected to the first end of the first Zener diode and the control end of the third transistor.

[0022] The first terminal of the third transistor is electrically connected to the first terminal of the third resistor; the second terminal of the third transistor is electrically connected to the first terminal of the first capacitor and the output terminal of the LDO module; the second terminal of the first capacitor is electrically connected to the second terminal of the first Zener diode and is grounded.

[0023] Optionally, the linear regulator module includes: a fourth resistor, a second Zener diode, and a second capacitor;

[0024] The first end of the fourth resistor is electrically connected to the output end of the power output module; the second end of the fourth resistor is electrically connected to the first end of the second Zener diode and the first end of the second capacitor; the second end of the second capacitor is electrically connected to the second end of the second Zener diode and grounded; the second end of the fourth resistor is electrically connected to the output end of the LDO module.

[0025] This invention connects a power supply module to the input terminal of an LDO module; the output terminal of the LDO module is connected to the control terminal of an output adjustment module; the power supply module is also connected to the input terminal of the output adjustment module; the output terminal of the output adjustment module is connected to the input terminal of an output feedback module; and the output terminal of the output feedback module is connected to the feedback terminal of the LDO module. When the power supply module outputs an input voltage, the LDO module outputs a certain voltage signal to the output adjustment module, causing the output adjustment module to close and operate. The input voltage from the power supply module is then converted into an output voltage signal and gradually output. During the output voltage signal output process, the output feedback module continuously monitors the voltage signal output by the output adjustment module and feeds it back to the LDO module. The LDO module outputs an adjustment signal to the output adjustment module based on the voltage signal. Under the adjustment signal from the LDO module, the output adjustment module converts the input voltage signal from the power supply module into a stable output voltage signal. By using the LDO module as a control device, the power supply circuit achieves stable voltage output. Furthermore, since the output adjustment module is located outside the LDO module, its parameters are adjustable, allowing for adjustable current output from the regulated power supply circuit.

[0026] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a voltage regulator circuit provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of a voltage regulator circuit provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of another voltage regulator circuit provided in this embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of another voltage regulator circuit provided in this embodiment of the present invention;

[0032] Figure 5This is a schematic diagram of another voltage regulator circuit provided in this embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of another voltage regulator circuit provided in this embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of another voltage regulator circuit provided in this embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of another voltage regulator circuit provided in this embodiment of the present invention;

[0036] Figure 9 This is a schematic diagram of another voltage regulator circuit provided in this embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of another voltage regulator circuit provided in this embodiment of the present invention. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] Figure 1 This is a schematic diagram of a voltage regulator circuit provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the regulated power supply circuit includes: a power module 10, an LDO module 20, an output adjustment module 30, and an output feedback module 40;

[0041] The power module 10 is electrically connected to the input terminal of the LDO module 20; the output terminal of the LDO module 20 is electrically connected to the control terminal of the output adjustment module 30; the power module 10 is also electrically connected to the input terminal of the output adjustment module 30; the output terminal of the output adjustment module 30 is electrically connected to the input terminal of the output feedback module 40; the output terminal of the output feedback module 40 is electrically connected to the feedback terminal of the LDO module 20.

[0042] The output feedback module 40 is used to detect the voltage signal output by the output adjustment module 30 in real time and feed it back to the LDO module 20; the LDO module 20 is used to output an adjustment signal to the output adjustment module 30 according to the voltage signal; the output adjustment module 30 is used to convert the input voltage signal output by the power module 10 into a stable output voltage signal under the adjustment signal of the LDO module 20.

[0043] The parameters of the output adjustment module 30 are adjustable so that the output current of the regulated power supply circuit is adjustable.

[0044] In the prior art, LDO module 20 is used alone as the power supply circuit; LDO module 20 itself is a low dropout voltage regulator module, which includes a feedback loop, an adjustment loop and an error amplifier; LDO module 20 can use its internal feedback loop, adjustment loop and error amplifier to convert the input voltage Vin output by power module 10 into a certain voltage signal Vout for stable output; while using LDO module 20 alone results in a smaller output current;

[0045] To address the issue of low output current in the aforementioned power supply circuit while ensuring stable output of the voltage signal Vout, this embodiment adds an output adjustment module 20 and an output feedback module 30 to the existing electrical connection between the power supply module 10 and the LDO module 20. (The output adjustment module 20 can be a device composed of multiple transistors or a single transistor; the output feedback module 30 can be a feedback device composed of multiple resistors. This embodiment does not limit the specific configuration of the output adjustment module 20 and the output feedback module 30.) The power supply module is also electrically connected to the input of the output adjustment module 30; the output of the LDO module 20 is electrically connected to the control terminal of the output adjustment module 30; the output of the output adjustment module 30 is electrically connected to the input of the output feedback module 40; and the output of the output of the output feedback module 40 is electrically connected to the feedback terminal of the LDO module 20.

[0046] When the power module 10 outputs the input voltage signal Vin, since there is no voltage at the feedback terminal of the LDO module 20 upon power-up, the output terminal of the LDO module 20 outputs a certain initial voltage signal to the output adjustment module 30, thereby causing the output adjustment module 30 to close and operate. The input voltage Vin is then gradually output through the output adjustment module 30. The output feedback module 30 detects the output voltage signal Vout output by the output adjustment module 30 in real time and feeds it back to the LDO module 20. Specifically, when the output voltage signal is greater than a set value, the LDO module 20 reduces its initial voltage signal according to the voltage signal Vout, thereby causing the output adjustment module 30 to adjust and reduce the output voltage signal Vout. When the output voltage signal Vout is less than the set value, the LDO module increases its initial voltage signal according to the output voltage signal Vout, thereby causing the output adjustment module 30 to adjust and increase the output voltage signal Vout. In this way, under the voltage signal control of the LDO module 20, the input voltage Vin is also converted into a certain output voltage signal Vout for stable output. That is, in this embodiment, the LDO module 20 is controlled by a power supply device, and the output voltage signal Vout is ensured by the peripheral output adjustment module 30 and the output feedback module 40. It can be understood that the input voltage Vin and the output voltage signal Vout are almost the same, with a small difference, which meets the power output requirements of the low dropout linear regulated power supply and reduces power consumption.

[0047] Meanwhile, in this embodiment, since the output adjustment module 30 is located outside the LDO module 20, the parameters of the output adjustment module 30 are adjustable, thus making the output current of the regulated power supply circuit adjustable. Specifically, the size of the output adjustment module 30 can be increased, thereby increasing the power of the output adjustment module 30, which in turn increases the output current of the regulated power supply circuit. In this way, while achieving a regulated output voltage, the regulated power supply circuit can be controlled to output a larger current by a small-current LDO module. In addition, this embodiment adds fewer external components based on the LDO module 20, thus also increasing the overall size of the regulated power supply circuit. Furthermore, since the LDO module has high efficiency, the regulated power supply circuit designed based on the LDO module also has high efficiency.

[0048] Optionally, based on the above embodiments, the output adjustment module 30 can be further refined. Figure 2 This is a schematic diagram of another voltage regulator circuit provided in an embodiment of the present invention, as shown below. Figure 2As shown, the output adjustment module 30 includes: an output start unit 31 and an output control unit 32; the input terminal of the output start unit 31 serves as the control terminal of the output adjustment module 30 and is electrically connected to the output terminal of the LDO module 20; the output terminal of the output start unit 31 is electrically connected to the control terminal of the output control unit 32; the input terminal of the output control unit 32 serves as the input terminal of the output adjustment module 30 and is electrically connected to the power supply module 10; the output terminal of the output control unit 32 serves as the output terminal of the output adjustment module 30 and is electrically connected to the input terminal of the output feedback module 40.

[0049] Specifically, the output start unit 31 can output a start control signal to the output control unit 32 under the adjustment signal of the LDO module 20. In this way, the output control unit 32 can convert the input voltage signal output by the power module 10 into a stable output voltage signal according to the start control signal. Thus, the output start unit 31 can improve the driving capability of the output control unit 32, thereby improving the control reliability of the output control unit 32.

[0050] Optionally, the specific circuit composition of the output start-up unit 31 can be further refined. Figure 3 This is a schematic diagram of another voltage regulator circuit provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the output start unit 31 includes: a first transistor Q1, a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is electrically connected to the output terminal of the LDO module 20; the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2 and the control terminal of the first transistor Q1; the second end of the second resistor R2 and the second end of the first transistor Q1 are grounded; the first end of the first transistor Q1 is electrically connected to the input terminal of the output control unit 32.

[0051] Specifically, when different voltage signals are input to the output terminal of LDO module 20, the voltage signals are divided by the first resistor R1 and the second resistor R2 and then drive the first transistor Q1 to conduct at different opening degrees, thereby outputting different start control signals to the output control unit 32. This allows the output control unit 32 to convert the input voltage signal output by the power module 10 into a stable output voltage signal according to the different start control signals.

[0052] Optional, Figure 4 This is a schematic diagram of another voltage regulator circuit provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the output start-up unit 31 further includes: a first filter capacitor C1; the first end of the first filter capacitor C1 is electrically connected to the first end of the first resistor R1; the second end of the first filter capacitor C1 is grounded. The first filter capacitor C1 filters the different voltage signals output from the output terminal of the LDO module 20, thereby improving the control reliability of the first transistor Q1.

[0053] Optionally, the specific circuit composition of the output control unit 32 can be further refined. Figure 5 This is a schematic diagram of another voltage regulator circuit provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the output control unit 32 includes: a second transistor Q2 and a first pull-up resistor R3; the control terminal of the second transistor Q2 is electrically connected to the output terminal of the output start-up unit 31 (i.e., the second terminal of the first transistor Q1) and the first terminal of the first pull-up resistor R3; the first terminal of the second transistor Q2 is electrically connected to the second terminal of the first pull-up resistor R3 and the power supply module 10; the second terminal of the second transistor Q2 is electrically connected to the output feedback module 40.

[0054] Specifically, the second transistor Q2 can be a PNP transistor or a PMOS transistor; this embodiment does not limit this. When the power module 10 outputs the input voltage signal Vin, since there is no voltage at the feedback terminal of the LDO module 20 when it is powered on, the output terminal of the LDO module 20 outputs a certain initial voltage signal to the first transistor Q1. This initial voltage signal is filtered by the first filter capacitor C1 and then divided by the first resistor R1 and the second resistor R2 to drive the first transistor Q1 to conduct. When the first transistor Q1 conducts, it pulls down the control terminal of the second transistor Q2, so the second transistor Q2 conducts, thereby converting the input voltage Vin into an output voltage signal through the second transistor Q2 and gradually outputting it.

[0055] The output feedback module 40 detects the output voltage signal Vout of the second transistor Q2 in real time and feeds it back to the LDO module 20. When the output voltage signal Vout is greater than the set value, the output voltage of the LDO module 20 will decrease, the first transistor Q1 will reduce its conduction, and the voltage at the first terminal of the first transistor Q1 will increase. Meanwhile, the BE voltage of the second transistor Q2 will decrease, and the second transistor Q2 will also reduce its conduction, resulting in a decrease in the output voltage signal through the second transistor Q2. When the output voltage signal Vout is less than the set value, the output voltage of the LDO module 20 will increase, the first transistor Q1 will increase its conduction, and the voltage at the first terminal of the first transistor Q1 will decrease. Meanwhile, the BE voltage of the second transistor Q2 will increase, and the second transistor Q2 will also increase its conduction, resulting in an increase in the output voltage signal through the second transistor Q2. This forms a complete feedback process.

[0056] The first pull-up resistor R3 serves two purposes: firstly, it prevents the second transistor Q2 from malfunctioning; secondly, it prevents the BE current in the first transistor Q1 from becoming too large, which would cause the switching speed to be too fast and make it difficult to control.

[0057] Optionally, the specific circuit composition of the output feedback module 40 can be further refined. Figure 6 This is a schematic diagram of another voltage regulator circuit provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the output feedback module 40 includes: a first voltage divider resistor R11 and a second voltage divider resistor R12; the first end of the first voltage divider resistor R11 is electrically connected to the output terminal of the output adjustment module 30 (i.e., connected to the second terminal of the second transistor Q2); the second end of the first voltage divider resistor R11 is electrically connected to the feedback terminal of the LDO module 20; the second end of the first voltage divider resistor R11 is also electrically connected to the first end of the second voltage divider resistor R12; the second end of the second voltage divider resistor R12 is grounded. The first voltage divider resistor R11 and the second voltage divider resistor R12 together form the output feedback module 40, which can provide real-time feedback on the magnitude of the output voltage signal, thereby forming negative feedback regulation with the LDO module, thus ensuring a stable output voltage signal.

[0058] Optional, continue to refer to Figure 6 The regulated power supply module also includes an energy storage module 50. The energy storage module 50 may include a first energy storage capacitor C01, with its first terminal electrically connected to the first terminal of a first voltage divider resistor R11. The second terminal of the first energy storage capacitor C01 is electrically connected to the second terminal of a second voltage divider resistor R12 and grounded. The first energy storage capacitor C01 serves as a filter and stabilizer, ensuring a stable feedback voltage output from the output feedback module 40. The capacitance value of the first energy storage capacitor C01 can be specifically set according to the magnitude of the output voltage signal and the charging speed; this embodiment does not impose specific limitations on this.

[0059] Optionally, the specific circuit composition of the power module 10 can be further refined. Figure 7 This is a schematic diagram of another voltage regulator circuit provided in an embodiment of the present invention, as shown below. Figure 7 As shown, the power module 10 includes a power input body 11 and an input filtering unit 12. The power input body 11 is electrically connected to the input terminal of the input filtering unit 12, the input terminal of the LDO module 20, and the input terminal of the output adjustment module 30 (i.e., electrically connected to the first terminal of the second transistor). The output terminal of the input filtering unit 12 is grounded. The power input body 11 outputs an input voltage signal Vin to the input filtering unit 12, thereby filtering the input voltage signal Vin. In some embodiments, the input filtering unit 12 may include a capacitor CO2.

[0060] Optionally, based on the above embodiments, the voltage regulator circuit can be further optimized. Figure 8 This is a schematic diagram of another voltage regulator circuit provided in an embodiment of the present invention, as shown below. Figure 8As shown, the regulated power supply circuit also includes: a linear regulator module 60; the input terminal of the linear regulator module 60 is electrically connected to the output terminal of the power supply module 10; the output terminal of the linear regulator module 60 is electrically connected to the input terminal of the LDO module 20.

[0061] In this embodiment, the input voltage signal Vin output by the power supply module 10 needs to take into account the input voltage range that the LDO module 20 can withstand. Generally, the input voltage range that the LDO module 20 can withstand is relatively small, so the voltage range of the input voltage signal Vin output by the power supply module 10 is relatively small, which limits the output voltage range of the output voltage signal. In this embodiment, a linear regulator module 60 is added. The input voltage signal is regulated and stepped down by the linear regulator module 60 before being output to the LDO module 20. This increases the voltage range of the input voltage signal, thereby increasing the voltage range of the overall regulated power supply circuit's output voltage signal and improving the driving capability of the power supply circuit.

[0062] Optionally, this embodiment provides a more detailed description of the specific circuitry of the linear voltage regulator module 60. Figure 9 This is a schematic diagram of another voltage regulator circuit provided in an embodiment of the present invention, as shown below. Figure 9 As shown, the linear voltage regulator module 60 includes: a third resistor R3, a first Zener diode D1, a third transistor Q3, and a first capacitor C11; the first end of the third resistor R3 is electrically connected to the output terminal of the power supply module 10; the second end of the third resistor R3 is electrically connected to the first end of the first Zener diode D1 and the control terminal of the third transistor Q3.

[0063] The first terminal of the third transistor Q3 is electrically connected to the first terminal of the third resistor R3; the second terminal of the third transistor Q3 is electrically connected to the first terminal of the first capacitor C11 and the output terminal of the LDO module 20; the second terminal of the first capacitor C11 is electrically connected to the second terminal of the first Zener diode D1 and grounded. The third resistor R3, the first Zener diode D1, and the third transistor Q3 together regulate and reduce the input voltage signal to a preset voltage. Because the third transistor Q3 amplifies the current, this linear regulator module is suitable for scenarios where the LDO module 20 has a high power supply current requirement. The first capacitor C11 acts as a filter.

[0064] Optionally, in other embodiments, Figure 10 This is a schematic diagram of another voltage regulator circuit provided in an embodiment of the present invention, as shown below. Figure 10As shown, the linear regulator module 60 includes: a fourth resistor R4, a second Zener diode D2, and a second capacitor C12; the first end of the fourth resistor R4 is electrically connected to the output terminal of the power supply module 10; the second end of the fourth resistor R4 is electrically connected to the first end of the second Zener diode D2 and the first end of the second capacitor C12; the second end of the second capacitor C12 is electrically connected to the second end of the second Zener diode D2 and grounded; the second end of the fourth resistor R4 is electrically connected to the output terminal of the LDO module 20. The second capacitor C12 and the fourth resistor R4 serve as filters. The second Zener diode D2 can regulate and reduce the input voltage signal to a preset voltage. This embodiment is suitable for scenarios where the supply current requirement of the LDO module 20 is relatively small.

[0065] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A regulated power supply circuit, characterized in that, include: Power supply module, LDO module, output adjustment module and output feedback module; The power supply module is electrically connected to the input terminal of the LDO module; the output terminal of the LDO module is electrically connected to the control terminal of the output adjustment module; the power supply module is electrically connected to the input terminal of the output adjustment module; the output terminal of the output adjustment module is electrically connected to the input terminal of the output feedback module; the output terminal of the output feedback module is electrically connected to the feedback terminal of the LDO module. The output feedback module is used to detect the voltage signal output by the output adjustment module in real time and feed it back to the LDO module; the LDO module is used to adjust the output adjustment signal to the output adjustment module according to the voltage signal; the output adjustment module is used to convert the input voltage signal output by the power module into a stable output voltage signal under the adjustment signal of the LDO module. The parameters of the output adjustment module are adjustable so that the output current of the regulated power supply circuit is adjustable.

2. The regulated power supply circuit according to claim 1, characterized in that, The output adjustment module includes: an output start unit and an output control unit; The input terminal of the output start unit serves as the control terminal of the output adjustment module and is electrically connected to the output terminal of the LDO module; the output terminal of the output start unit is electrically connected to the control terminal of the output control unit; the input terminal of the output control unit serves as the input terminal of the output adjustment module and is electrically connected to the power module; the output terminal of the output control unit serves as the output terminal of the output adjustment module and is electrically connected to the input terminal of the output feedback module.

3. The regulated power supply circuit according to claim 2, characterized in that, The output activation unit includes: a first transistor, a first resistor, and a second resistor; The first end of the first resistor is electrically connected to the output terminal of the LDO module; the second end of the first resistor is electrically connected to the first end of the second resistor and the control terminal of the first transistor; the second end of the second resistor and the second end of the first transistor are grounded; the first end of the first transistor is electrically connected to the input terminal of the output control unit.

4. The regulated power supply circuit according to claim 3, characterized in that, The output start-up unit further includes: a first filter capacitor; a first terminal of the first filter capacitor is electrically connected to a first terminal of the first resistor; and a second terminal of the first filter capacitor is grounded.

5. The regulated power supply circuit according to claim 2, characterized in that, The output control unit includes: a second transistor and a first pull-up resistor; The control terminal of the second transistor is electrically connected to the output terminal of the output start-up unit and the first terminal of the first pull-up resistor; the first terminal of the second transistor is electrically connected to the second terminal of the first pull-up resistor and the power supply module; the second terminal of the second transistor is electrically connected to the output feedback module.

6. The regulated power supply circuit according to claim 1, characterized in that, The output feedback module includes: a first voltage divider resistor and a second voltage divider resistor; a first end of the first voltage divider resistor is electrically connected to the output end of the output adjustment module; a second end of the first voltage divider resistor is electrically connected to the feedback end of the LDO module; a second end of the first voltage divider resistor is also electrically connected to the first end of the second voltage divider resistor; and a second end of the second voltage divider resistor is grounded.

7. The regulated power supply circuit according to claim 1, characterized in that, The power module includes a power input body and an input filtering unit; the power input body is electrically connected to the input terminal of the input filtering unit, the input terminal of the LDO module, and the input terminal of the output adjustment module. The output terminal of the input filter unit is grounded.

8. The regulated power supply circuit according to claim 1, characterized in that, Also includes: A linear voltage regulator module; the input terminal of the linear voltage regulator module is electrically connected to the output terminal of the power supply module; the output terminal of the linear voltage regulator module is electrically connected to the input terminal of the LDO module.

9. The regulated power supply circuit according to claim 8, characterized in that, The linear voltage regulator module includes: a third resistor, a first Zener diode, a third transistor, and a first capacitor; The first end of the third resistor is electrically connected to the output end of the power module; the second end of the third resistor is electrically connected to the first end of the first Zener diode and the control end of the third transistor. The first terminal of the third transistor is electrically connected to the first terminal of the third resistor; the second terminal of the third transistor is electrically connected to the first terminal of the first capacitor and the output terminal of the LDO module; the second terminal of the first capacitor is electrically connected to the second terminal of the first Zener diode and is grounded.

10. The regulated power supply circuit according to claim 8, characterized in that, The linear voltage regulator module includes: a fourth resistor, a second Zener diode, and a second capacitor; The first end of the fourth resistor is electrically connected to the output end of the power module; the second end of the fourth resistor is electrically connected to the first end of the second Zener diode and the first end of the second capacitor; the second end of the second capacitor is electrically connected to the second end of the second Zener diode and grounded; the second end of the fourth resistor is electrically connected to the output end of the LDO module.

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