Voltage stabilization control circuit, device and system for regulating voltage

Abstract

The utility model relates to a voltage stabilization control circuit, device and system for voltage regulation, the voltage stabilization control circuit for voltage regulation comprises a protection circuit, a resistance-capacitance voltage reduction circuit, a capacitive reactance circuit and a voltage regulation circuit, one end of the protection circuit is connected with a power supply input end, one end of the capacitive reactance circuit is connected with a power supply output end, and the other end of the capacitive reactance circuit is connected with the voltage regulation circuit. The other end of the protection circuit, the resistance-capacitance step-down circuit, the voltage regulation circuit and the capacitive reactance circuit are connected in sequence, and the voltage regulation circuit is connected with an external control chip; wherein the resistance-capacitance step-down circuit is used for stabilizing the voltage of the power supply output end, and the voltage regulation circuit is used for outputting a fine tuning voltage according to a control signal output by an external control chip, so that the voltage can be finely tuned according to the control signal output by the external control chip, and the requirements of different loads are met. By adopting the protection circuit and the capacitive reactance circuit, the influence of changes of input voltage, load, environment temperature and the like on output voltage is reduced.

Description

Technical Field

[0001] This application relates to the field of circuit design. Specifically, it relates to a voltage regulating control circuit, device, and system for adjusting voltage. Background Art

[0002] A voltage stabilizing circuit is a circuit that can still maintain a constant output voltage when the input voltage, load, ambient temperature, circuit parameters, etc. change. Such a circuit can provide a stable DC power supply and is widely used in various electronic devices.

[0003] The connection method between the voltage stabilizing circuit and the load is divided into a series voltage stabilizing power supply and a parallel voltage stabilizing power supply; it is divided into a linear voltage stabilizing power supply and a switching voltage stabilizing power supply according to the working state of the regulating transistor; it is divided into a simple voltage stabilizing power supply and a feedback type voltage stabilizing power supply according to the circuit type. However, no matter which type of power supply it is, the output voltage is fixed and unchanged, making it difficult to meet the actual usage requirements. Summary of the Utility Model

[0004] The purpose of this application is to provide a voltage regulating control circuit, device, and system for adjusting voltage to solve the problem that the existing output voltage is fixed and unchanged and difficult to meet the actual usage requirements.

[0005] To solve the above problems, this application adopts the following technical solutions to achieve:

[0006] The first aspect of this application provides a voltage regulating control circuit for adjusting voltage. The voltage regulating control circuit includes: a protection circuit, a resistor-capacitor step-down circuit, a capacitive reactance circuit, and a voltage regulating circuit. One end of the protection circuit is connected to the power input terminal, one end of the capacitive reactance circuit is connected to the power output terminal, the other end of the protection circuit, the resistor-capacitor step-down circuit, the voltage regulating circuit, and the capacitive reactance circuit are connected in sequence, and the voltage regulating circuit is connected to an external control chip; wherein, the resistor-capacitor step-down circuit is used to stabilize the voltage at the power output terminal, and the voltage regulating circuit is used to output a fine-tuning voltage according to the control signal output by the external control chip.

[0007] By connecting the voltage regulating circuit to an external control chip, the fine-tuning voltage can be adjusted according to the control signal output by the external control chip, thereby meeting the requirements of different loads; at the same time, by adopting the protection circuit and the capacitive reactance circuit, the influence of changes in input voltage, load, ambient temperature, etc. on the output voltage can be reduced.

[0008] Further, the protection circuit includes a fuse tube and a bidirectional breakdown diode. One end of the fuse tube is connected to the power input terminal, and the other end of the fuse tube is respectively connected to the bidirectional breakdown diode and the resistor-capacitor step-down circuit.

[0009] By adopting a protection circuit composed of a fuse tube and a bidirectional breakdown diode, the circuit can be quickly cut off in case of faults such as abnormal input voltage or load short circuit, protecting the circuit from damage and improving the reliability of the circuit.

[0010] Further, the protection circuit further includes a first capacitor and a first resistor. One end of the first capacitor is respectively connected to the fuse tube and the first resistor, and the other end of the first resistor and the other end of the first capacitor are both grounded.

[0011] By adding the first capacitor and the first resistor, the noise and ripple at the power input end are filtered, improving the stability and reliability of the circuit and reducing the damage of the surge voltage to the circuit.

[0012] Further, the capacitive voltage step-down circuit includes a step-down voltage regulator and a MOS transistor. The PGATE pin of the step-down voltage regulator is connected to the gate of the MOS transistor, the source of the MOS transistor is connected to the VM pin of the step-down voltage regulator, the drain of the MOS transistor is connected to one end of the voltage regulation circuit, and the FB terminal of the step-down voltage regulator is connected to the other end of the voltage regulation circuit.

[0013] By adopting the capacitive voltage step-down circuit, the input voltage can be effectively reduced and a stable output voltage can be provided, ensuring the normal operation of the load, improving the stability of the output voltage, and avoiding the influence of voltage fluctuations on the load performance.

[0014] Further, the capacitive voltage step-down circuit further includes a second capacitor and a third capacitor. The two ends of the second capacitor are respectively connected to the VCC pin and the VM pin of the step-down voltage regulator, and the two ends of the third capacitor are respectively connected to the ADJ pin and the VM pin of the step-down voltage regulator.

[0015] Through the second capacitor and the third capacitor, the noise and ripple at the power input end are filtered, providing a stable power supply voltage to the step-down voltage regulator and enhancing the load adaptability of the circuit.

[0016] Further, the capacitive voltage step-down circuit further includes a second resistor, and the second resistor is connected in parallel with the third capacitor.

[0017] By connecting the second resistor and the third capacitor in parallel, a fast voltage response can be provided, enabling the circuit to quickly adapt to changes in the input voltage and improving the dynamic performance of the circuit.

[0018] Further, the capacitive reactance circuit includes a fourth capacitor and a first inductor. One end of the first inductor is connected to the drain of the MOS transistor, one end of the fourth capacitor is grounded, and the other end of the fourth capacitor is connected to the power output end and the other end of the first inductor.

[0019] By adding a fourth capacitor and a first inductor, the anti-interference ability of the circuit is enhanced, the dynamic response of the circuit is improved, and the stability and reliability of the circuit are increased.

[0020] Furthermore, the number of the fourth capacitors is multiple, and the multiple fourth capacitors are arranged in parallel.

[0021] By arranging multiple fourth capacitors in parallel, the bandwidth of the filter is increased, so that the circuit can more effectively filter out high-frequency noise and ripple, and the reliability and stability of the circuit are enhanced.

[0022] The present application further provides a voltage regulating and stabilizing control device, including a housing with a receiving cavity formed therein, and the voltage regulating and stabilizing control circuit according to any one of the above, which is disposed in the housing.

[0023] The present application further provides a voltage regulating and stabilizing control system, and the voltage regulating and stabilizing control system includes the voltage regulating and stabilizing control device described above.

[0024] Compared with the prior art, the beneficial effects of the present application are as follows: Since the voltage regulating circuit is connected to an external control chip, the voltage regulating circuit is used to output a fine-tuning voltage according to the control signal output by the external control chip, so that the fine-tuning voltage can be performed according to the control signal output by the external control chip to meet the requirements of different loads. By adopting the protection circuit and the capacitive reactance circuit, the influence of changes in input voltage, load, ambient temperature, etc. on the output voltage can be effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic diagram of a protection circuit provided by an embodiment of the present application;

[0026] Figure 2 FIG. is a schematic diagram of a resistor-capacitor step-down circuit provided by an embodiment of the present application;

[0027] Figure 3 FIG. is a schematic diagram of a capacitive reactance circuit provided by an embodiment of the present application; and

[0028] Figure 4 FIG. is a schematic diagram of a voltage regulating circuit provided by an embodiment of the present application.

[0029] DESCRIPTION OF THE REFERENCE NUMERALS:

[0030] 100, protection circuit; 110, fuse tube; 120, bidirectional breakdown diode; 130, first capacitor; 140, first resistor; 200, resistor-capacitor step-down circuit; 210, step-down voltage regulator; 220, MOS transistor; 230, second capacitor; 240, third capacitor; 250, second resistor; 300, capacitive reactance circuit; 310, fourth capacitor; 320, first inductor; 400, voltage regulating circuit. Detailed implementation manners

[0031] The following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings.

[0032] It should be noted that, without conflict, the embodiments in the present application and the technical features in the embodiments may be combined with each other. The detailed description in the specific implementation manners should be understood as an explanatory illustration of the gist of the present application and should not be regarded as an improper limitation to the present application.

[0033] It should be understood that the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings. These orientation terms are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0034] Figure 1 It is a schematic diagram of a protection circuit provided by an embodiment of the present application. Figure 2 It is a schematic diagram of a resistor-capacitor step-down circuit provided by an embodiment of the present application. Figure 3 It is a schematic diagram of a capacitive reactance circuit provided by an embodiment of the present application. Figure 4 It is a schematic diagram of a voltage regulation circuit provided by an embodiment of the present application.

[0035] As Figures 1 to 4 shown, an embodiment of the present application provides a voltage regulation and stabilization control circuit. The voltage regulation and stabilization control circuit includes: a protection circuit 100, a resistor-capacitor step-down circuit 200, a capacitive reactance circuit 300, and a voltage regulation circuit 400. One end of the protection circuit 100 is connected to the power input terminal, one end of the capacitive reactance circuit 300 is connected to the power output terminal, the other end of the protection circuit 100, the resistor-capacitor step-down circuit 200, the voltage regulation circuit 300, and the capacitive reactance circuit 400 are connected in sequence, and the voltage regulation circuit 400 is connected to an external control chip; wherein, the resistor-capacitor step-down circuit 200 is used to stabilize the voltage at the power output terminal, and the voltage regulation circuit 400 is used to output a fine-tuning voltage according to the control signal output by the external control chip.

[0036] Specifically, one end of the protection circuit 100 is connected to the power input terminal, and is used to protect the circuit safety when the input voltage is abnormal and prevent damage caused by overvoltage or overcurrent. The protection circuit 100 can be implemented by a silicon-controlled rectifier (SCR) or other protection components. One end of the resistor-capacitor step-down circuit 200 is connected to the power output terminal, and the other end of the capacitive reactance circuit 300 is connected to the power output terminal. It is composed of capacitive elements and is used to compensate for the voltage fluctuation caused by the load change and maintain the stability of the output voltage. The voltage regulation circuit 400 is connected to the external control chip and outputs a fine-tuning voltage according to the control signal output by the external control chip to compensate for the output voltage deviation caused by factors such as ambient temperature and load change.

[0037] It should be noted that in practical applications, the regulated voltage stabilizing control circuit can be applied to various electronic devices, such as computers, communication devices, medical instruments, etc., to ensure that these devices can obtain a stable DC power supply under different working environments. For example, in a computer system, the voltage stabilizing circuit can be installed inside the power supply to provide a stable voltage for various electronic components inside the computer. When the external environmental temperature changes or the computer load changes, the circuit can automatically adjust the output voltage to ensure the normal operation of the computer system. In communication devices, since communication devices have extremely high requirements for power supply stability, the voltage stabilizing circuit can effectively offset the impacts brought by power grid fluctuations and load changes, ensure the stable operation of communication devices, and avoid data loss or communication interruption. In medical instruments, since many medical devices have very high requirements for power supply stability, the voltage stabilizing circuit provided in this embodiment can ensure that medical devices work at an accurate voltage, avoiding device damage or affecting the treatment effect.

[0038] By connecting to an external control chip through the voltage regulating circuit 400, the voltage can be finely adjusted according to the control signal output by the external control chip, so as to meet the requirements of different loads; at the same time, by adopting the protection circuit 100 and the capacitive reactance circuit 300, the impacts of changes in input voltage, load, ambient temperature, etc. on the output voltage can be reduced.

[0039] In some embodiments, the protection circuit 100 includes a fuse tube 110 and a bidirectional breakdown diode 120. One end of the fuse tube 110 is connected to the power input terminal, and the other end of the fuse tube 110 is respectively connected to the bidirectional breakdown diode 120 and the capacitive voltage reduction circuit 200.

[0040] Specifically, connect one end of the fuse tube 110 to the power input terminal, and the other end of the fuse tube 110 is respectively connected to the bidirectional breakdown diode 120 and the capacitive voltage reduction circuit 200. The bidirectional breakdown diode 120 is a special diode that can play a protective role under both positive and negative voltages. Connect the other end of the bidirectional breakdown diode 120 to the capacitive voltage reduction circuit 200. The capacitive voltage reduction circuit 200 is a circuit used to reduce voltage, usually composed of a resistor and a capacitor. The other end of the capacitive voltage reduction circuit 200 is connected to other parts of the circuit to ensure the normal operation of the circuit.

[0041] By adopting the protection circuit composed of the fuse tube 110 and the bidirectional breakdown diode 120, the circuit can be quickly cut off in case of faults such as abnormal input voltage or load short circuit, protecting the circuit from damage and improving the reliability of the circuit.

[0042] In some embodiments, the protection circuit 100 further includes a first capacitor 130 and a first resistor 140. One end of the first capacitor 130 is connected to the fuse 110 and the first resistor 140 respectively, and the other end of the first resistor 140 and the other end of the first capacitor 130 are both grounded.

[0043] Specifically, one end of the first capacitor 130 is connected to the fuse 110. For example, it is achieved by connecting one terminal of the first capacitor 130 to one terminal of the fuse 110 to ensure stable connection and good contact. The other end of the first capacitor 130 is connected to the first resistor 140. The first capacitor 130 is an element that stores electrical energy and is usually used for filtering, coupling, or bypass applications. The first resistor 140 is used to protect the circuit or regulate the voltage. The other end of the first resistor 140 is connected to the other end of the first capacitor 130, and both the other ends of the first capacitor 130 and the first resistor 140 are grounded, which means the common terminal of the first capacitor 130 and the first resistor 140 is connected to the ground wire.

[0044] By adding the first capacitor 130 and the first resistor 140, the noise and ripple at the power input end are filtered out, the stability and reliability of the circuit are improved, and the damage to the circuit caused by the surge voltage is reduced.

[0045] In some embodiments, the resistor-capacitor step-down circuit 200 includes a step-down voltage regulator 210 and a MOS transistor 220. The PGATE pin of the step-down voltage regulator 210 is connected to the gate of the MOS transistor 220, the source of the MOS transistor 220 is connected to the VM pin of the step-down voltage regulator 210, the drain of the MOS transistor 220 is connected to one end of the voltage regulation circuit 400, and the FB terminal of the step-down voltage regulator 210 is connected to the other end of the voltage regulation circuit 400.

[0046] Specifically, the step-down voltage regulator 210 is a circuit element that can reduce the input voltage to a specified voltage and has pins such as PGATE, VM, and FB. The MOS transistor 220 is used to control the flow of current and has a source, a gate, and a drain.

[0047] Connect the PGATE pin of the step-down voltage regulator 210 to the gate of the MOS transistor 220. For example, use wires or solder joints to connect the corresponding pins of the two components to ensure stable connection and good contact. Similarly, use wires or solder joints to connect the source of the MOS transistor 220 and the VM pin of the step-down voltage regulator 210. Connect the drain of the MOS transistor 220 to one end of the voltage regulation circuit 400 through wires or solder joints. It should be noted that appropriate resistor-capacitor components, such as capacitors and resistors, are added to the circuit to achieve the required step-down effect and stability. These components can be selected and configured according to the specific application scenario and circuit requirements.

[0048] Specifically, the MOS transistor 220 is an NMOS transistor, and the buck regulator 210 uses an integrated chip with the model LM5085MY. The Vin terminal of the buck regulator 210 can input a DC voltage of 35V - 60V. When the buck regulator 210 is powered on, its PGATE terminal outputs a high level, turning on the MOS transistor 220. The current output by the MOS transistor 220 is output to the power output terminal through the first inductor 320, and its output voltage is generally 30V. The FB terminal of the buck regulator 210 is the feedback terminal. When the buck regulator 210 is powered on, it periodically obtains the feedback voltage of the voltage regulation circuit 400, enabling the external control chip to output a corresponding control signal to the voltage regulation circuit 400.

[0049] By adopting the capacitive voltage - step - down circuit 200, the input voltage can be effectively reduced, and a stable output voltage can be provided, ensuring the normal operation of the load, improving the stability of the output voltage, and avoiding the influence of voltage fluctuations on the load performance.

[0050] In some embodiments, the capacitive voltage - step - down circuit 200 further includes a second capacitor 230 and a third capacitor 240. The two ends of the second capacitor 230 are respectively connected to the VCC pin and the VM pin of the buck regulator 210, and the two ends of the third capacitor 240 are respectively connected to the ADJ pin and the VM pin of the buck regulator 210.

[0051] Specifically, connect the two ends of the second capacitor 230 to the VCC pin and the VM pin of the buck regulator 210 respectively. For example, it is achieved by connecting one terminal of the second capacitor 230 to the VCC pin of the buck regulator 210 and the other terminal to the VM pin to ensure stable connection and good contact. Similarly, connect the two ends of the third capacitor 240 to the ADJ pin and the VM pin of the buck regulator 210 respectively, and connect the other pins of the buck regulator 210 to the corresponding components according to the design requirements to ensure the normal operation of the entire circuit. It should be understood that the selection of the second capacitor 230 and the third capacitor 240 should meet the performance requirements of the circuit, including parameters such as capacitance value, withstand voltage value, and capacitive reactance, which helps to ensure the stability and efficiency of the circuit.

[0052] Through the second capacitor 230 and the third capacitor 240, the noise and ripple at the power input terminal are filtered out, providing a stable power supply voltage to the buck regulator 210 and enhancing the load adaptability of the circuit.

[0053] In some embodiments, the capacitive voltage - step - down circuit 200 further includes a second resistor 250, and the second resistor 250 is connected in parallel with the third capacitor 240.

[0054] Specifically, the second resistor 250 and the third capacitor 240 are arranged in parallel, which means that the two ends of the second resistor 250 and the two ends of the third capacitor 240 are connected together to form a parallel combination. The second resistor 250 and the third capacitor 240 arranged in parallel should be located at appropriate positions in the circuit so that they can act together on the voltage and current in the circuit. Select appropriate parameters for the second resistor 250 and the third capacitor 240, including resistance value, capacitance value, withstand voltage value, etc., to ensure the stability and efficiency of the circuit. The above parameters should be determined according to the application scenario and performance requirements of the circuit. Connect the second resistor 250 and the third capacitor 240 arranged in parallel to other parts of the circuit to ensure the normal operation of the entire circuit. By arranging the second resistor 250 and the third capacitor 240 in parallel, a fast voltage response can be provided, enabling the circuit to quickly adapt to changes in the input voltage and improving the dynamic performance of the circuit.

[0055] In some embodiments, the capacitive reactance circuit 300 includes a fourth capacitor 310 and a first inductor 320. One end of the first inductor 320 is connected to the drain of the MOS transistor 220. One end of the fourth capacitor 310 is grounded, and the other end of the fourth capacitor 310 is connected to the power output terminal and the other end of the first inductor 320.

[0056] Specifically, one end of the first inductor 320 is connected to the drain of the MOS transistor 220. For example, one terminal of the first inductor 320 is connected to the drain pin of the MOS transistor 220, and one end of the fourth capacitor 310 is grounded. The other end of the fourth capacitor 310 is connected to the power output terminal and the other end of the first inductor 320. For example, use a wire or a solder joint to connect the other terminal of the fourth capacitor 310 to the power output terminal and the other terminal of the first inductor 320 at the same time.

[0057] By adding the fourth capacitor 310 and the first inductor 320, the anti-interference ability of the circuit is enhanced, the dynamic response of the circuit is improved, and the stability and reliability of the circuit are increased.

[0058] In some embodiments, the number of the fourth capacitors 310 is multiple, and the multiple fourth capacitors 310 are arranged in parallel.

[0059] Specifically, the multiple fourth capacitors 310 are arranged in parallel, which means that the two terminals of each fourth capacitor 310 are respectively connected to the two terminals of other fourth capacitors 310 to form a parallel combination. The multiple fourth capacitors 310 arranged in parallel should be located at appropriate positions in the circuit so that they can act together on the voltage and current in the circuit. At the same time, select appropriate parameters for the fourth capacitor 310, including capacitance value, withstand voltage value, etc., to ensure the stability and efficiency of the circuit.

[0060] By setting multiple fourth capacitors 310 in parallel, the bandwidth of the filter is increased, enabling the circuit to more effectively filter out high-frequency noise and ripple, and enhancing the reliability and stability of the circuit.

[0061] To better understand the regulated voltage control circuit for adjusting voltage in the embodiments of the present application, the working principle thereof will be elaborated below.

[0062] When the buck regulator 210 is powered on, a high level is output at its PGATE terminal, causing the MOS transistor 220 to conduct. The current output by the MOS transistor 220 is output to the power output terminal via the first inductor 320. At the same time, the FB terminal of the buck regulator 210 periodically obtains the voltage drop of the resistor, causing the external control chip to output corresponding control signals PWR SWO, PWR SW1, PWR SW2, and / or PWR SW3 to the voltage regulation circuit 400 to control the conduction or shutdown of the corresponding parts, thereby controlling the number of resistors connected in series at the other end of the first inductor 320 to adjust the voltage division of the voltage regulation circuit 400, and finally adjusting the output voltage and current magnitude at the power output terminal. When the MOS transistor 220 is conducting, the buck regulator 210 can also control the magnitude of the conduction current of the MOS transistor 220 to adjust the voltage of the first inductor 320. When the buck regulator 210 controls the MOS transistor 220 to cut off, the first inductor 320 discharges. At this time, the diode connected to the MOS transistor 220 functions as a freewheeling diode, enabling a certain voltage to still be output at the power output terminal.

[0063] The second aspect of the embodiments of the present application provides a regulated voltage control device for adjusting voltage, including a housing with a receiving cavity formed therein, and the regulated voltage control circuit according to any one of the above, which is disposed in the housing.

[0064] The third aspect of the embodiments of the present application provides a regulated voltage control system for adjusting voltage, and the regulated voltage control system includes the regulated voltage control device for adjusting voltage.

[0065] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions required to be protected by the present application.

Claims

1. A voltage regulating control circuit for regulating voltage, characterized in that, The voltage regulation and stabilization control circuit includes: a protection circuit, a resistor-capacitor step-down circuit, a capacitive reactance circuit, and a voltage regulation circuit. One end of the protection circuit is connected to the power input terminal, one end of the capacitive reactance circuit is connected to the power output terminal, the other end of the protection circuit, the resistor-capacitor step-down circuit, the voltage regulation circuit, and the capacitive reactance circuit are connected in sequence, and the voltage regulation circuit is connected to an external control chip; wherein, the resistor-capacitor step-down circuit is used to stabilize the voltage at the power output terminal, and the voltage regulation circuit is used to output a fine-tuning voltage according to the control signal output by the external control chip.

2. The voltage regulating control circuit for regulating voltage according to claim 1, wherein The protection circuit includes a fuse tube and a bidirectional breakdown diode. One end of the fuse tube is connected to the power input terminal, and the other end of the fuse tube is respectively connected to the bidirectional breakdown diode and the resistor-capacitor step-down circuit.

3. The voltage regulating control circuit for regulating voltage according to claim 2, characterized in that The protection circuit further includes a first capacitor and a first resistor. One end of the first capacitor is respectively connected to the fuse tube and the first resistor, and the other end of the first resistor and the other end of the first capacitor are both grounded.

4. A voltage regulating control circuit for regulating voltage according to claim 2, characterized in that, The resistor-capacitor step-down circuit includes a step-down voltage regulator and a MOS transistor. The PGATE pin of the step-down voltage regulator is connected to the gate of the MOS transistor, the source of the MOS transistor is connected to the VM pin of the step-down voltage regulator, the drain of the MOS transistor is connected to one end of the voltage regulation circuit, and the FB terminal of the step-down voltage regulator is connected to the other end of the voltage regulation circuit.

5. The voltage regulation control circuit for adjusting voltage according to claim 4, characterized in that The resistor-capacitor step-down circuit further includes a second capacitor and a third capacitor. The two ends of the second capacitor are respectively connected to the VCC pin and the VM pin of the step-down voltage regulator, and the two ends of the third capacitor are respectively connected to the ADJ pin and the VM pin of the step-down voltage regulator.

6. The voltage regulation control circuit for regulating voltage according to claim 5, characterized in that, The resistor-capacitor step-down circuit further includes a second resistor, and the second resistor is connected in parallel with the third capacitor.

7. The voltage regulating control circuit for regulating voltage according to claim 4, characterized in that, The capacitive reactance circuit includes a fourth capacitor and a first inductor. One end of the first inductor is connected to the drain of the MOS transistor, one end of the fourth capacitor is grounded, and the other end of the fourth capacitor is connected to the power output terminal and the other end of the first inductor.

8. The voltage regulating control circuit for regulating voltage according to claim 7, characterized in that, The number of the fourth capacitors is multiple, and the multiple fourth capacitors are connected in parallel.

9. A voltage regulating control device for regulating voltage, characterized in that, A housing having a receiving cavity formed therein, and the voltage regulation and stabilization control circuit according to any one of claims 1-8 is disposed in the housing.

10. A regulated voltage control system, characterized in that, The voltage regulation and stabilization control system includes the voltage regulation and stabilization control device according to claim 9.

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