A voltage stabilizing power supply circuit, voltage stabilizing implementation method and electronic equipment

Abstract

The present application provides a voltage-stabilized power supply circuit, a voltage-stabilized implementation method, and an electronic device, wherein a first reference voltage providing module outputs a first reference voltage; a second reference voltage providing module outputs a second reference voltage and a first control signal; a voltage-stabilizing module is connected to a power supply and outputs a second control signal, and outputs a corresponding operating voltage when the first reference voltage is connected, and outputs a corresponding operating voltage when the second reference voltage is connected; the operating voltage is equal to the minimum value among a voltage threshold, a target operating voltage, and a power supply; a reference voltage control module is connected to a first control signal and a second control signal, and transmits the first reference voltage to the voltage-stabilizing module when the first control signal or the second control signal is at a first level, and transmits the second reference voltage to the voltage-stabilizing module when the first control signal and the second control signal are at a second level, and at this time, the first reference voltage is 0. The present application outputs a stable operating voltage at low power consumption, and improves circuit stability.

Description

Technical Field

[0001] The present application relates to the field of integrated circuit technology, and in particular to a voltage-stabilized power supply circuit, a voltage-stabilization implementation method, and an electronic device. Background Art

[0002] In various electronic devices, the operation of electronic components requires a stable and reliable power supply, so the design of the power supply is a very critical task.

[0003] As the requirements for low power consumption of various electronic devices become more and more urgent, the development of low-power power supply circuits has become more and more practical. Summary of the invention

[0004] The embodiments of the present application provide a voltage-stabilized power supply circuit, a voltage-stabilization implementation method, and an electronic device. The present application can reduce mismatch while improving accuracy and bandwidth.

[0005] In a first aspect, an embodiment of the present application provides a voltage-stabilized power supply circuit, comprising:

[0006] The first reference voltage providing module is used to access the power supply and the first control signal and output a first reference voltage, wherein the power supply increases from zero to a maximum power value;

[0007] The second reference voltage providing module is used to access the working voltage and output the second reference voltage and the first control signal; the second reference voltage is less affected by external factors than the first reference voltage;

[0008] The voltage stabilizing module is used to connect to the power supply and output a second control signal, and output a corresponding working voltage when the first reference voltage is connected, and output a corresponding working voltage when the second reference voltage is connected; the working voltage is equal to the minimum value of the voltage threshold, the target working voltage and the power supply; the voltage threshold is equal to the product of the second reference voltage and a preset ratio, and the preset ratio is a positive number;

[0009] The reference voltage control module is used to connect the first control signal and the second control signal, and transmit the connected first reference voltage to the voltage stabilizing module when the first control signal or the second control signal is at the first level, and transmit the second reference voltage to the voltage stabilizing module when the first control signal and the second control signal are at the second level, at which time the first reference voltage is 0; the second level is greater than the first level.

[0010] In a second aspect, an embodiment of the present application further provides an electronic device, wherein the electronic device comprises the voltage-stabilized power supply circuit as described in the first aspect.

[0011] In a third aspect, an embodiment of the present application further provides a voltage stabilization implementation method, which is applied to the voltage stabilization power supply circuit described in the first aspect, and the method comprises the steps of:

[0012] Accessing a first reference voltage output by the first reference voltage providing module and a second reference voltage output by the second reference voltage providing module, and accessing a first control signal output by the second reference voltage providing module and a second control signal output by the voltage stabilizing module;

[0013] When the first control signal or the second control signal is at a first level, the reference voltage control module transmits the first reference voltage output by the first reference voltage providing module to the voltage stabilizing module, so that the voltage stabilizing module outputs a corresponding operating voltage according to the first reference voltage and the power supply, and the power supply increases from zero to a maximum power value;

[0014] When the first control signal and the second control signal are at the second level, the reference voltage control module transmits the second reference voltage output by the second reference voltage providing module according to the working voltage to the voltage stabilizing module, so that the voltage stabilizing module outputs a corresponding working voltage according to the second reference voltage and the power supply; the second level is greater than the first level; the second reference voltage is less affected by external factors than the first reference voltage; the working voltage is equal to the minimum value of the voltage threshold, the target working voltage and the power supply; the voltage threshold is equal to the product of the second reference voltage and a preset ratio, and the preset ratio is a positive number.

[0015] The embodiments of the present application provide a voltage-stabilized power supply circuit, a voltage-stabilization implementation method, and an electronic device. The circuit includes a first reference voltage providing module, a second reference voltage providing module, a voltage-stabilizing module, and a reference voltage control module. The output end of the first reference voltage providing module is connected to the first input end of the reference voltage control module and the control end of the voltage-stabilizing module, the first output end of the second reference voltage providing module is connected to the control end of the reference voltage control module and the control end of the first reference voltage providing module, the second output end of the second reference voltage providing module is connected to the input end of the voltage-stabilizing module, the power input end of the second reference voltage providing module is connected to the first output end of the voltage-stabilizing module, and the second output end of the voltage-stabilizing module is connected to the second input end of the reference voltage control module; the first reference voltage providing module is used to access a power supply and a first control signal, and output a first reference voltage, and the power supply increases from zero to a maximum power value; the second reference voltage providing module is used to access an operating voltage, and output a second reference voltage and the first reference voltage. A control signal; the second reference voltage is less affected by external factors than the first reference voltage; the voltage stabilizing module is used to access the power supply and output the second control signal, and output the corresponding working voltage when the first reference voltage is accessed, and output the corresponding working voltage when the second reference voltage is accessed; the working voltage is equal to the minimum value of the voltage threshold, the target working voltage and the power supply; the voltage threshold is equal to the product of the second reference voltage and a preset ratio, and the preset ratio is a positive number; the reference voltage control module is used to access the first control signal and the second control signal, and when the first control signal or the second control signal is at the first level, the first reference voltage connected is transmitted to the voltage stabilizing module, and when the first control signal and the second control signal are at the second level, the second reference voltage is transmitted to the voltage stabilizing module, and the first reference voltage is 0 at this time; the second level is greater than the first level. The present application outputs a stable working voltage at low power consumption to improve circuit stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A module schematic diagram of a conventional voltage-stabilized power supply circuit is shown;

[0018] Figure 2 A module schematic diagram of a voltage-stabilized power supply circuit in an embodiment of the present application is shown;

[0019] Figure 3 A circuit structure schematic diagram of a voltage-stabilized power supply circuit in an embodiment of the present application is shown;

[0020] Figure 4 A schematic diagram of voltage change in an embodiment of the present application is shown;

[0021] Figure 5 A circuit structure schematic diagram of a second reference voltage providing module of the voltage-stabilized power supply circuit in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0023] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "exemplarily" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present application. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0024] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0025] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0026] “At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

[0027] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0028] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0029] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0030] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0031] The first electrode of each transistor used in the embodiments of the present application is one of the source and the drain, and the third electrode of each transistor is the other of the source and the drain. Since the source and drain of the transistor can be symmetrical in structure, the source and drain can be structurally indistinguishable, that is, the first electrode / first end and the third electrode of the transistor in the embodiments of the present application can be structurally indistinguishable. Exemplarily, in the case where the transistor is a P-type transistor, the first electrode / first end of the transistor is the source, and the third electrode is the drain; exemplarily, in the case where the transistor is an N-type transistor, the first electrode of the transistor is the drain, and the third electrode is the source.

[0032] In the circuit structure provided in the embodiments of the present application, the first node, the second node and other nodes do not represent actual existing components, but represent the junction points of related couplings in the circuit diagram, that is, these nodes are nodes formed by the equivalent junction points of related couplings in the circuit diagram.

[0033] PSRR (Power Supply Rejection Ratio) is an important indicator to measure the circuit's ability to suppress power supply noise. The larger the PSRR value, the smaller the impact of power supply noise on the output signal, thereby better maintaining the stability and integrity of the output signal. It shows that the circuit can still effectively suppress noise when facing large power supply voltage fluctuations, ensuring the quality and stability of the output signal.

[0034] With the rapid development of automobile and industrial technology, the requirements for low power consumption of automotive and industrial electronic products are increasing. The power supply Vs has a large range (for example, 2.5V~40V), and the power supply Vs needs to be stepped down before it can power the subsequent low-voltage circuits. At the same time, it is necessary to ensure that the subsequent circuits can also work when the power supply Vs is at the lowest operating voltage. Low power consumption, the lowest voltage of the power supply Vs (for example, 2.5V) is a key indicator of the voltage-stabilized power supply circuit. To this end, the present application provides a voltage-stabilized power supply circuit, a voltage-stabilized implementation method, and an electronic device, which are described in detail below.

[0035] See also Figure 1 , Figure 1 A module schematic diagram of a traditional voltage-stabilized power supply circuit is shown. Figure 1 The voltage-stabilized power supply circuit shown generates a power supply Vdd1 which is greatly affected by PVT (Process, Voltage, Temperature). A stable reference voltage Vref is generated by the power supply Vdd1, and then the reference voltage Vref is used to drive an LDO (Low Dropout Regulator) to achieve a stable output voltage. Figure 1 The voltage-stabilizing power supply circuit shown is an open-loop circuit and lacks a feedback mechanism for adjusting the output voltage, so it cannot effectively offset the impact of PVT changes.

[0036] See also Figure 2 , Figure 2 A schematic diagram of a module of a voltage-stabilized power supply circuit in an embodiment of the present application is shown. Figure 2As shown, the voltage-stabilized power supply circuit includes: a first reference voltage providing module 10, a second reference voltage providing module 20, a voltage stabilizing module 30 and a reference voltage control module 40, wherein the output end of the first reference voltage providing module 10 is connected to the first input end of the reference voltage control module 40 and the control end of the voltage stabilizing module 30, the first output end of the second reference voltage providing module 20 is connected to the control end of the reference voltage control module 40 and the control end of the first reference voltage providing module 10, the second output end of the second reference voltage providing module 20 is connected to the input end of the voltage stabilizing module 30, the power input end of the second reference voltage providing module 20 is connected to the first output end of the voltage stabilizing module 30, and the second output end of the voltage stabilizing module 30 is connected to the second input end of the reference voltage control module 40;

[0037] The first reference voltage providing module 10 is used to connect to the power supply Vs and the first control signal V bg_ok , and outputs a first reference voltage Vref1, the power supply Vs increases from zero to a maximum power value;

[0038] The second reference voltage providing module 20 is used to access the working voltage LDO_OUT and output the second reference voltage Vref2 and the first control signal V bg_ok The second reference voltage Vref2 is less affected by external factors than the first reference voltage Vref1;

[0039] The voltage stabilizing module 30 is used to connect to the power supply Vs and output the second control signal Vstb, and output the corresponding working voltage LDO_OUT when the first reference voltage Vref1 is connected, and output the corresponding working voltage LDO_OUT when the second reference voltage Vref2 is connected; the working voltage LDO_OUT is equal to the minimum value of the voltage threshold, the target working voltage Vn and the power supply Vs; the voltage threshold is equal to the product of the second reference voltage Vref2 and a preset ratio, and the preset ratio is a positive number;

[0040] The reference voltage control module 40 is used to access the first control signal V bg_ok and the second control signal Vstb, the first control signal V bg_ok or when the second control signal Vstb is at the first level, the first reference voltage Vref1 is transmitted to the voltage stabilizing module 30, and when the first control signal V bg_ok When the second control signal Vstb is at the second level, the second reference voltage Vref2 is transmitted to the voltage stabilizing module 30 , and at this time, the first reference voltage Vref1 is 0; the second level is greater than the first level.

[0041] Specifically, the preset working voltage Vm is a voltage that enables the second reference voltage providing module 20 to work, and the target working voltage Vn is a voltage that enables the voltage-stabilized power supply circuit to work normally, so as to output a stable working voltage under the premise of low power consumption. The voltage range of the power supply Vs is relatively large, and the first reference voltage providing module 10 processes the connected power supply Vs to output the first reference voltage Vref1. When the power supply Vs starts to rise from 0, i.e., in the initial stage T1, the power supply Vs connected to the voltage stabilizing module 30 is less than the preset working voltage Vm, and the working voltage LDO_OUT output by the voltage stabilizing module 30 is equal to the voltage of the power supply Vs. In the first stage T1, since the working voltage LDO_OUT output by the voltage stabilizing module 30 does not reach the minimum power supply voltage (i.e., the preset working voltage Vm of the present application) that enables the second reference voltage providing module 20 to work, at this time, the reference voltage control module 40 selects to transmit the first reference voltage Vref1 output by the first reference voltage providing module 10 to the voltage stabilizing module 30, so that the voltage stabilizing module 30 generates the working voltage LDO_OUT according to the power supply Vs and the first reference voltage Vref1, until the working voltage LDO_OUT output by the voltage stabilizing module 30 reaches the preset working voltage Vm that enables the second reference providing module to work.

[0042] As the voltage of the power supply Vs gradually rises to the preset working voltage Vm but does not rise to the target working voltage Vn, i.e., the second stage T2, the working voltage LDO_OUT output by the voltage stabilizing module 30 also rises accordingly, reaching the minimum power supply voltage (i.e., the preset working voltage Vm of the present application) for the second reference voltage providing module 20 to work. Therefore, the second reference voltage providing module 20 generates the second reference voltage Vref2, and the first control signal V generated by the second reference voltage providing module 20 bg_ok The first level (such as a low level) is flipped to the second level (such as a high level). At this time, the reference voltage control module 40 selects to transmit the second reference voltage Vref2 output by the second reference voltage providing module 20 to the voltage stabilizing module 30, so that the voltage stabilizing module 30 generates a stable operating voltage LDO_OUT according to the power supply Vs and the second reference voltage Vref2. At this time, the operating voltage LDO_OUT is equal to the minimum value of the voltage threshold, the target operating voltage Vn and the power supply Vs, that is, the operating voltage LDO_OUT is equal to the power supply Vs.

[0043] As the voltage of the power supply Vs continues to gradually rise from the target operating voltage Vn, that is, the third stage T3, the voltage stabilizing module 30 still generates a stable operating voltage LDO_OUT based on the power supply Vs and the second reference voltage Vref2 transmitted by the reference voltage control module 40. At this time, the operating voltage LDO_OUT is equal to the minimum value of the voltage threshold, the target operating voltage Vn and the power supply Vs, that is, the operating voltage LDO_OUT is equal to the minimum value of the voltage threshold and the target operating voltage Vn.

[0044] In the present application, when the power supply Vs is less than the preset working voltage Vm, the first reference voltage Vref1 output by the first reference voltage providing module 10 is transmitted to the voltage stabilizing module 30, so that the working voltage LDO_OUT output by the voltage stabilizing module 30 is equal to the voltage of the power supply Vs, until the working voltage LDO_OUT reaches the preset working voltage Vm. The preset working voltage Vm of the present application can make the first control signal V output by the second reference voltage providing module 20 bg_ok Flipping from the first level to the second level. When the power supply Vs is greater than the preset working voltage Vm, the second reference voltage providing module 20 can output the second reference voltage Vref2 based on the working voltage LDO_OUT output by the voltage stabilizing module 30. At this time, the second reference voltage Vref2 is transmitted to the voltage stabilizing module 30 through the reference voltage control module 40, so that the working voltage LDO_OUT output by the voltage stabilizing module 30 is equal to the minimum value among the voltage threshold, the target working voltage Vn and the power supply Vs. In this way, when the power supply Vs is greater than the target working voltage Vn, the working voltage LDO_OUT output by the voltage stabilizing module 30 is maintained at the target working voltage Vn, thereby protecting the circuit safety. In addition, since the second reference voltage Vref2 is less affected by external factors (such as PVT) than the first reference voltage Vref1, it indicates that the variation range of the second reference voltage Vref2 output by the second reference voltage providing module 20 is smaller than the variation range of the first reference voltage Vref1 output by the first reference voltage providing module 10. Therefore, when the power supply Vs is greater than the preset operating voltage Vm, the second reference voltage Vref2 as the reference voltage of the voltage stabilizing module 30 can significantly improve the accuracy of the output voltage of the voltage stabilizing source circuit.

[0045] In some embodiments, see Figure 2 , Figure 3 and Figure 4 , Figure 3 A circuit structure diagram of a voltage-stabilized power supply circuit in an embodiment of the present application is shown. Figure 4 Schematic diagram of voltage change in the embodiment of the present application is shown. Figure 3 As shown, the reference voltage control module 40 includes: a first transistor NM4 and a second transistor NM5;

[0046] The first electrode D of the first transistor NM4 is connected to the output end of the first reference voltage providing module 10 as the first input end of the reference voltage control module 40 to access the first reference voltage Vref1, and the second electrode G of the first transistor NM4 is connected to the output end of the first reference voltage providing module 10 as the first input end of the reference voltage control module 40 to access the first control signal V bg_ok ;

[0047] The first electrode D of the second transistor NM5 is connected to the third electrode S of the first transistor NM4, the second electrode G of the second transistor NM5 is connected to the second output end of the voltage stabilizing module 30 as the second input end of the reference voltage control module 40 to access the second control signal Vstb, and the third electrode S of the second transistor NM5 is grounded.

[0048] Specifically, Figure 4 As shown, when the power supply Vs starts to rise from 0, the working voltage LDO_OUT output by the voltage stabilizing module 30 rises as the voltage of the power supply Vs rises. bg_ok In the first stage T1, the first level is reached, so the first transistor NM4 and the second transistor NM5 are in the off state, and the reference voltage control module 40 transmits the first reference voltage Vref1 output by the first reference voltage providing module 10 to the voltage stabilizing module 30 as a reference voltage. When the working voltage LDO_OUT output by the voltage stabilizing module 30 reaches the starting voltage that enables the second reference voltage providing module 20 to start working, the second reference voltage providing module 20 starts working and generates a corresponding voltage according to the connected working voltage LDO_OUT, until the voltage output by the second reference voltage providing module 20 is established to a certain accuracy, the first control signal V bg_ok The first level is flipped to the second level, so the first transistor NM4 and the second transistor NM5 are in the on state, and the first reference voltage Vref1 connected is pulled down to the ground, so that the reference voltage control module 40 transmits the second reference voltage Vref2 output by the second reference voltage providing module 20 to the voltage stabilizing module 30 as a reference voltage. In this embodiment, the reference voltage control module 40 combines the first control signal V bg_ok , realizing the switching of the reference voltage connected to the voltage stabilizing module 30 , that is, the reference voltage connected to the voltage stabilizing module 30 is either the first reference voltage Vref1 or the second reference voltage Vref2 .

[0049] It should be noted that the first reference voltage Vref1 may be greater than the second reference voltage Vref2. Figure 4The first reference voltage Vref1 can also be less than the second reference voltage Vref2, and the first reference voltage Vref1 can also be equal to the second reference voltage Vref2. In short, no matter how the first reference voltage Vref1 and the second reference voltage Vref2 are, when the first control signal V bg_ok When the first level is switched to the second level, the first reference voltage Vref1 input to the voltage stabilizing module 30 is switched to the second reference voltage Vref2 .

[0050] In some embodiments, see Figure 2 , Figure 3 and Figure 4 , the first reference voltage providing module 10 includes: a first resistor R1, a second resistor R2, a third resistor R0, a diode D1, a third transistor PM0 and a fourth transistor NM0;

[0051] The first end of the first resistor R1 is connected to the power supply Vs, the second end of the first resistor R1 is connected to the first end of the second resistor R2, the cathode of the diode D1 is connected between the second end of the first resistor R1 and the first end of the second resistor R2, and the anode of the diode D1 is grounded;

[0052] The third electrode S of the third transistor PM0 is connected to the second end of the second resistor R2, and the second electrode G of the third transistor PM0 is connected to the first output end of the second reference voltage providing module 20 as the control end of the first reference voltage providing module 10 to access the first control signal V bg_ok ;

[0053] The first electrode D of the fourth transistor NM0 is connected to the first electrode D of the third transistor PM0 and the second electrode G of the fourth transistor NM0, the third electrode S of the fourth transistor NM0 is connected to the first end of the third resistor R0, the second end of the third resistor R0 is connected to the third electrode of the second transistor NM5, and the first electrode D of the fourth transistor NM0 serves as the output end of the first reference voltage providing module 10 to output the first reference voltage Vref1.

[0054] Specifically, Figure 4 As shown, due to the first control signal V output by the second reference voltage providing module 20 bg_ok In the first stage, T1 is the first level, such as Figure 2 and Figure 3 As shown, the third electrode of the third transistor PM0 is connected to the power supply Vs and the second electrode of the third transistor PM0 is connected to the first control signal V bg_okis the first level, therefore, the third transistor PM0 and the fourth transistor NM0 are both turned on (or opened) to output the first reference voltage Vref1 to the first electrode of the first transistor NM4 of the reference voltage control module 40 and the second electrode of the tenth transistor NM2 of the following embodiment in the voltage stabilizing module 30 .

[0055] In some embodiments, see Figure 2 and Figure 3 , the voltage stabilizing module 30 includes: a fourth resistor R3, a fifth resistor R4, a sixth resistor R5, a fifth transistor PM1, a sixth transistor PM2, a seventh transistor HVNM1, an eighth transistor HVNM2, a ninth transistor NM1, a tenth transistor NM2, an eleventh transistor NM3 and a twelfth transistor HVPOWER;

[0056] The third electrode S of the fifth transistor PM1, the third electrode S of the sixth transistor PM2 and the third electrode S of the twelfth transistor HVPOWER are all connected to the first end of the first resistor to be connected to the power supply Vs;

[0057] The second electrode G of the fifth transistor PM1 is connected to the second electrode G of the sixth transistor PM2, and the first electrode D of the fifth transistor PM1 is connected to the second electrode G of the fifth transistor PM1;

[0058] The first electrode D of the seventh transistor HVNM1 is connected to the first electrode D of the fifth transistor PM1, and the second electrode G of the seventh transistor HVNM1 is connected between the second end of the first resistor R1 and the first end of the second resistor R2;

[0059] The first electrode D of the eighth transistor HVNM2 is respectively connected to the first electrode D of the sixth transistor PM2 and the second electrode G of the twelfth transistor HVPOWER, and the second electrode G of the eighth transistor HVNM2 is connected to the second electrode G of the seventh transistor HVNM1;

[0060] The first electrode D of the ninth transistor NM1 is connected to the third electrode S of the seventh transistor HVNM1, the second electrode G of the ninth transistor NM1 is connected between the first end of the fifth resistor R4 and the second end of the sixth resistor R5, the first end of the fifth resistor R4 and the second end of the sixth resistor R5 are both used as the second output end of the voltage stabilizing module 30, the third electrode S of the ninth transistor NM1 is connected to the first end of the fourth resistor R3, and the second end of the fourth resistor R3 is connected to the third electrode S of the second transistor NM5;

[0061] The first electrode D of the tenth transistor NM2 is connected to the third electrode S of the eighth transistor HVNM2, the second electrode G of the tenth transistor NM2 is connected to the first electrode D of the fourth transistor NM0 as the control end of the voltage stabilizing module 30 to access the first reference voltage Vref1, and the third electrode S of the tenth transistor NM2 is connected to the third electrode S of the ninth transistor NM1;

[0062] The first electrode D of the eleventh transistor NM3 is connected to the first electrode D of the tenth transistor NM2, the second electrode G of the eleventh transistor NM3 is connected to the second output end of the second reference voltage providing module 20 as the input end of the voltage stabilizing module 30 to access the second reference voltage Vref2, and the third electrode S of the eleventh transistor NM3 is connected to the third electrode S of the ninth transistor NM1;

[0063] The second end of the fifth resistor R4 is connected to the second end of the fourth resistor R3, the first end of the fifth resistor R4 is connected to the second end of the sixth resistor R5, the first end of the sixth resistor R5 is respectively connected to the third electrode S of the eighth transistor HVNM2 and the first electrode D of the twelfth transistor HVPOWER, and the first electrode D of the twelfth transistor HVPOWER serves as the first output end of the voltage stabilizing module 30;

[0064] The preset ratio is equal to a quotient value obtained by taking the resistance value of the fifth resistor R4 as the dividend and the sum of the resistance values ​​of the fifth resistor R4 and the sixth resistor R5 as the divisor.

[0065] Specifically, the fifth transistor PM1, the sixth transistor PM2, the ninth transistor NM1, the tenth transistor NM2 and the eleventh transistor NM3 are all low-voltage transistors, and the seventh transistor HVNM1, the eighth transistor HVNM2 and the twelfth transistor HVPOWER are all high-voltage transistors. The use of high-voltage transistors in this application can withstand high input voltages, and the use of low-voltage transistors can adjust the output voltage to ensure the stability and efficiency of the entire system. The fifth resistor R4 and the sixth resistor R5 play a key role in the voltage stabilizing module 30. In the embodiment of the present application, by using the fifth transistor PM1, the sixth transistor PM2, the ninth transistor NM1, the tenth transistor NM2 and the eleventh transistor NM3, the current limiting function can be achieved to prevent damage under overload conditions. In addition, the use of the seventh transistor HVNM1, the eighth transistor HVNM2 and the twelfth transistor HVPOWER can provide additional protection to ensure the safe operation of the system in a high-voltage environment. This embodiment achieves efficient and stable voltage regulation, while ensuring good performance and reliability during the conversion process between high input voltage and low output voltage.

[0066] In some embodiments, see Figure 2 and Figure 3 , the voltage stabilizing module 30 further includes: a seventh resistor R6, a first capacitor C0, a second capacitor Cc and a third capacitor Cf;

[0067] The first end of the first capacitor C0 is connected between the third electrode S of the sixth transistor PM2 and the third electrode S of the twelfth transistor HVPOWER, the second end of the first capacitor C0 is connected to the first end of the seventh resistor R6, and the second end of the seventh resistor R6 is connected between the first electrode D of the sixth transistor PM2 and the second electrode G of the twelfth transistor HVPOWER;

[0068] The first end of the second capacitor Cc is connected between the third electrode S of the eighth transistor HVNM2 and the first electrode D of the tenth transistor NM2, and the second end of the second capacitor Cc is connected between the first electrode D of the twelfth transistor HVPOWER and the first end of the sixth resistor R5;

[0069] A first end of the third capacitor Cf is connected between the first electrode D of the twelfth transistor HVPOWER and the second end of the second capacitor Cc, and a second end of the third capacitor Cf is grounded.

[0070] Specifically, the second capacitor Cc is a capacitor for frequency compensation. The second capacitor Cc implements Cascode compensation. Compared with Miller compensation, Cascode compensation can better suppress power supply noise and improve PSRR. The third capacitor Cf can reduce the ripple of the output working voltage LDO_OUT as a filter capacitor. The first capacitor C0 and the seventh resistor R6 improve the overall stability of the circuit by introducing a current limiting zero point.

[0071] In some embodiments, see Figure 2 , Figure 3 and Figure 4 As shown, when the power supply Vs is equal to the minimum power supply voltage Vmin, the first reference voltage Vref1 is greater than or equal to the product result corresponding to the minimum power supply voltage Vmin and the inverse of the preset ratio; when the power supply Vs is equal to the maximum power supply voltage Vmax, the first reference voltage Vref1 is less than the product result corresponding to the maximum withstand voltage of the device and the inverse of the preset ratio.

[0072] Specifically, Figure 4As shown, in the first stage T1, when the working voltage LDO_OUT output by the voltage stabilizing module 30 does not reach the minimum supply voltage (i.e., the preset working voltage Vm of the present application, which can be 2V to 2.5V) that enables the second reference voltage providing module 20 to work, the above embodiment is continued, at this time, the first transistor NM4 and the second transistor NM5 are turned off, and the first reference voltage Vref1 output by the first reference voltage providing module 10 is used as the reference voltage input to the voltage stabilizing module 30, and the first control signal V bg_ok The voltage level is the first level, the second reference voltage providing module 20 has not started to work and output the second reference voltage Vref2, the eleventh transistor NM3 is turned off, and the ninth transistor NM1 and the tenth transistor NM2 that are turned on or turned on constitute the operational amplifier input pair of the voltage stabilizing module 30. At this time, the working voltage LDO_OUT output by the voltage stabilizing module 30 = (R4+R5) / R4*Vref1.

[0073] When the power supply Vs rises from the target working voltage Vn to the maximum power supply voltage Vmax, the first control signal V bg_ok The first transistor NM4 and the second transistor NM5 are turned on, so that the first reference voltage Vref1 is pulled down to the ground, the tenth transistor NM2 is turned off, and the second reference voltage providing module 20 has started to work and output the second reference voltage Vref2. The ninth transistor NM1 and the eleventh transistor NM3 that are turned on or turned on constitute the operational amplifier input pair of the voltage stabilizing module 30. At this time, the working voltage LDO_OUT output by the voltage stabilizing module 30 is equal to (R4+R5) / R4*Vref2.

[0074] In order to ensure that the output working voltage LDO_OUT of the voltage stabilizing module 30 can follow the input power supply voltage when the slow power-on low voltage (rising from 0 to the target working voltage Vn) is achieved, the first reference voltage Vref1 under the PVT condition is required to meet the following requirements: when the power supply Vs is equal to the minimum power supply voltage Vmin (for example, 2.5V), the first reference voltage Vref1 needs to be greater than or equal to the product of the minimum power supply voltage Vmin and the inverse of the preset ratio, that is, Vref1≥Vmin*R4 / (R4+R5). At this time, the working voltage LDO_OUT output by the voltage stabilizing module 30 is close to the power supply Vs, which can ensure the operation of the second reference voltage providing module 20. For example, Vmin=2.5V, R4=1.5MΩ, R5=3.5MΩ, then Vref1≥Vmin*R4 / (R4+R5)=0.75V.

[0075] In order to ensure that the voltage regulator module 30 can be powered on quickly to the maximum power supply voltage Vmax, the output working voltage LDO_OUT is less than the device withstand voltage before switching to the second reference voltage Vref2, and the first reference voltage Vref1 is required to meet the following requirements: when the power supply Vs is equal to the maximum power supply voltage Vmax (for example, 40V), the first reference voltage Vref1 needs to be less than the product of the maximum withstand voltage Vd of the device and the inverse of the preset ratio, that is, Vref1<Vd*R4 / (R4+R5). At this time, the working voltage LDO_OUT output by the voltage regulator module 30 can be less than the maximum withstand voltage Vd of the device to ensure circuit reliability. For example, Vd=5.5V, R4=1.5MΩ, R5=3.5MΩ, then Vref1<Vd*R4 / (R4+R5)=1.65V.

[0076] The first reference voltage providing module 10 is composed of a first resistor R1, a second resistor R2, a third resistor R0, a diode D1, a third transistor PM0 and a fourth transistor NM0. The temperature and process characteristics of the resistors and MOS diodes cause their electrical parameters to change, thereby affecting the overall performance and stability of the circuit. Therefore, the first reference voltage Vref1 output by the first reference voltage providing module 10 is easily affected by PVT. In order to solve this problem, the present application also provides a second reference voltage providing module 20, and the details can be seen in the following embodiments.

[0077] In some embodiments, the second reference voltage providing module 20 includes a bandgap reference unit 21 and a voltage detection unit 22, the bandgap reference unit 21 and the voltage detection unit 22 are both connected to the first output terminal of the voltage stabilizing module 30, the voltage detection unit 22 is connected to the bandgap reference unit 21, and the voltage detection unit 22 is connected to the control terminal of the reference voltage control module 40 and the input terminal of the voltage stabilizing module 30;

[0078] The bandgap reference unit 21 is used to access the working voltage LDO_OUT output by the voltage stabilizing module 30, and output a bias current source Iptat and a first voltage signal Vbg when the working voltage LDO_OUT is equal to a preset working voltage;

[0079] The voltage detection unit 22 is used to connect the bias current source Iptat, the first voltage signal Vbg and the working voltage LDO_OUT output by the voltage stabilizing module 30, and output the second reference voltage Vref2 to the input end of the voltage stabilizing module 30, and output the first control signal V bg_ok To the control end of the reference voltage control module 40.

[0080] Specifically, when the power supply Vs starts to rise from 0 and does not reach the target working voltage Vn, the first reference voltage Vref1 is used as the reference voltage connected to the voltage stabilizing module 30, and the working voltage LDO_OUT output by the voltage stabilizing module 30 increases along with the power supply Vs (i.e., the working voltage LDO_OUT=power supply Vs). When the power supply Vs rises to reach the target working voltage Vn, the bandgap reference unit 21 and the voltage detection unit 22 of the second reference voltage providing module 20 start to work. When the first control signal V output by the voltage detection unit 22 is bg_ok The working voltage LDO_OUT output by the voltage stabilizing module 30 is switched from the first level to the second level, and the second control signal Vstb and the first control signal V are divided by the fifth resistor R4 and the sixth resistor R5. bg_ok The first transistor NM4 and the second transistor NM5 are controlled to be turned on, so as to pull the first reference voltage Vref1 down to the ground, thereby controlling the tenth transistor NM2 to be turned off, and at this time the ninth transistor NM1 and the eleventh transistor NM3 serve as the input transistor pair of the voltage stabilizing module 30. Since the first reference voltage Vref1 is pulled down to the ground, the working voltage LDO_OUT output by the voltage stabilizing module 30 = (R4 + R5) / R4 * Vref2.

[0081] In some embodiments, see Figure 2 , Figure 3 and Figure 5 As shown, Figure 5 A circuit structure diagram of the second reference voltage providing module 20 of the voltage-stabilized power supply circuit in the embodiment of the present application is shown. Figure 3 and Figure 5 As shown, the voltage detection unit 22 includes an operational amplifier EA, a thirteenth transistor PM3, a fourteenth transistor PM4, a fifteenth transistor NM8, a sixteenth transistor NM6, a seventeenth transistor NM7, an eighth resistor R8, a ninth resistor R7, a tenth resistor R9, a first hysteresis comparator I3, a second hysteresis comparator I4, a bias current source Iptat and an AND logic operator I5;

[0082] The inverting input terminal of the operational amplifier EA is connected to the first voltage signal Vbg, the power input terminal of the operational amplifier EA is connected to the first output terminal of the voltage stabilizing module 30 as the power input terminal of the second reference voltage providing module 20 to connect to the working voltage LDO_OUT, the non-inverting input terminal of the operational amplifier EA is connected between the second end of the eighth resistor R8 and the first end of the ninth resistor R7, the output terminal of the operational amplifier EA is connected to the second electrode G of the thirteenth transistor PM3, and the second end of the ninth resistor R7 is grounded;

[0083] The third electrode S of the thirteenth transistor PM3 is connected to the first output end of the voltage stabilizing module 30 as the power input end of the second reference voltage providing module 20 to access the working voltage LDO_OUT, the first electrode D of the thirteenth transistor PM3 is connected to the first end of the eighth resistor R8, and the first electrode D of the thirteenth transistor PM3 is used as the second output end of the second reference voltage providing module 20 to output the second reference voltage Vref2;

[0084] A first end of the bias current source Iptat is connected to a third electrode S of the thirteenth transistor PM3, a second end of the bias current source Iptat is connected to a first electrode D of the seventeenth transistor NM7, a second electrode G of the seventeenth transistor NM7 is connected to a first end of the ninth resistor R7, a third electrode S of the seventeenth transistor NM7 is connected to a first end of the tenth resistor R9, and a second end of the tenth resistor R9 is grounded;

[0085] The input end of the first hysteresis comparator I3 is connected between the second end of the bias current source Iptat and the first electrode D of the seventeenth transistor NM7, and the output end of the first hysteresis comparator I3 is connected to the second electrode G of the fifteenth transistor NM8;

[0086] A third electrode S of the fourteenth transistor PM4 is connected to the third electrode S of the thirteenth transistor PM3, a second electrode G of the fourteenth transistor PM4 is connected to the second electrode G of the thirteenth transistor PM3, and a first electrode D of the fourteenth transistor PM4 is connected to the first electrode D of the sixteenth transistor NM6;

[0087] The second electrode G of the sixteenth transistor NM6 is connected to the second electrode G of the fourteenth transistor PM4, the third electrode S of the sixteenth transistor NM6 is connected to the first electrode D of the fifteenth transistor NM8, and the third electrode S of the fifteenth transistor NM8 is grounded;

[0088] The input end of the second hysteresis comparator I4 is connected between the first electrode D of the fourteenth transistor PM4 and the first electrode D of the sixteenth transistor NM6, the output end of the second hysteresis comparator I4 is connected to the first input end of the AND logic operator I5, the second input end of the AND logic operator I5 is connected to the output end of the first hysteresis comparator I3, and the output end of the AND logic operator I5 is connected to the control end of the reference voltage control module 40 and the control end of the first reference voltage providing module 10 as the first output end of the second reference voltage providing module 20 to output the first control signal V bg_ok .

[0089] Specifically, the operational amplifier EA, the ninth resistor R7, the eighth resistor R8, and the thirteenth transistor PM3 form a buf (Buffer) circuit. The bias current source Iptat, the seventeenth transistor NM7, the tenth resistor R9, and the first hysteresis comparator I3 form a simple current comparator. The fourteenth transistor PM4, the fifteenth transistor NM8, the sixteenth transistor NM6, the second hysteresis comparator I4, and the multiplexed thirteenth transistor PM3 form a simple voltage comparator.

[0090] For Iptat, NM7, R9, and I3, to detect whether Bg_buf is established to the preset accuracy, the Bg_buf voltage corresponding to the buf_ok changing from low level to high level is: (bg_buf_sp - Vgsn7 * R9 = iptat, that is, bg_buf_sp = R9 * iptat + Vgsn7. Here, Vgsn7 is the source-gate voltage of NM7. For PM4, NM5, NM6, and I4, to detect whether the working voltage LDO_OUT is established to LDO_OUT > Vgsn6 + Vgsp4. If LDO_OUT > Vgsn6 + Vgsp4, the vdd_ok is at high level, otherwise it is at low level. Here, Vgsn6 is the source-gate voltage of NM6, and Vgsp4 is the source-gate voltage of PM4.

[0091] Among them, the simple current comparator compares the first pull-down current Idn1 flowing through the tenth resistor R9 with the current flowing through the bias current source Iptat. The first pull-down current Idn1 is equal to the difference between the second divided voltage Bg_buf and the gate-source voltage of the seventeenth transistor NM7 divided by the resistance value of the tenth resistor R9. Therefore, if the second divided voltage Bg_buf is small, the first pull-down current Idn1 flowing through the tenth resistor R9 is small. At this time, iptat > idn1, and the voltage VA of the first node A is pulled up to high level, and the buf_ok signal is at low level; if the second divided voltage Bg_buf is large, the first pull-down current Idn1 flowing through the tenth resistor R9 is large. At this time, iptat < idn1, and the voltage VA of the first node A is pulled down to low level, and the buf_ok signal is at high level.

[0092] When the working voltage LDO_OUT output by the voltage stabilizing module 30 is less than the sum of the gate-source voltage of the thirteenth transistor PM3 and the gate-source voltage of the sixteenth transistor NM6, the second pull-down current Idn2 flowing through the sixteenth transistor NM6 is less than the pull-up current Iup1 flowing through the fourteenth transistor PM4, that is, when the second pull-down current Idn2<the pull-up current Iup1, the voltage of the second node B between the first electrode of the fourteenth transistor PM4 and the first electrode of the sixteenth transistor NM6 is high, and the second signal vdd_ok output by the second hysteresis comparator I4 is low. When the working voltage LDO_OUT output by the voltage stabilizing module 30 is greater than the sum of the gate-source voltage of the thirteenth transistor PM3 and the gate-source voltage of the sixteenth transistor NM6, the second pull-down current Idn2 flowing through the sixteenth transistor NM6 is greater than the pull-up current Iup1 flowing through the fourteenth transistor PM4, that is, the second pull-down current Idn2>the pull-up current Iup1, and the second signal vdd_ok output by the second hysteresis comparator I4 flips to a high level. That is to say, when Idn2<Iup1, vdd_ok is at a low level, and when Idn2>Iup1, vdd_ok is at a high level.

[0093] The two input terminals of the AND logic operator I5 are connected to the first signal buf_ok and the second signal vdd_ok respectively. Therefore, the first control signal V bg_ok The first control signal V bg_ok is high level, when either the first signal buf_ok or the second signal vdd_ok is low level, the first control signal V bg_ok is low level.

[0094] When the power supply Vs is less than the target operating voltage Vn (for example, 2V), the first control signal V bg_ok is the first level, and when the power supply Vs is greater than the target operating voltage Vn, the first control signal V bg_ok is the second level, and the target operating voltage Vn is less than the voltage threshold.

[0095] When the reference voltage connected to the voltage stabilizing module 30 is switched from the first reference voltage Vref1 to the second reference voltage Vref2, repeated oscillation may occur. In order to ensure that the reference voltage can be stably switched without repeated oscillation during low voltage slow power-up, the switching condition needs to be met. See the following embodiments for details.

[0096] In some embodiments, when the voltage stabilizing module 30 is connected to the second reference voltage Vref2 , the second reference voltage Vref2 output by the second reference voltage providing module 20 is greater than or equal to the product of the first preset voltage and the first set ratio.

[0097] In some embodiments, the first control signal V bg_ok Before switching from the first level to the second level, the second divided voltage Bg_buf connected to the second electrode G of the seventeenth transistor NM7 is greater than or equal to the product of the second preset voltage and the second set ratio.

[0098] Specifically, when the reference voltage connected to the voltage stabilizing module 30 switches from the first reference voltage Vref1 to the second reference voltage Vref2, the second reference voltage Vref2 output by the second reference voltage providing module 20 is greater than or equal to the product of the first preset voltage and the first set ratio. The first set ratio can be 60%, 61%, 65%, 70%, 75%, 80%, etc., which can be set by yourself, and the first preset voltage V1 is 1.5V. Assuming that the first set ratio is 60%, that is, Vref2≥V1*p1=1.5V*60%=0.9V, the working voltage LDO_OUT output by the voltage stabilizing module 30 is LDO_OUT=Vref2*(R4+R5) / R4=0.9V*3.3=2.97V>Vm.

[0099] Specifically, when the first control signal V bg_ok Before switching from the first level to the second level, the first control signal V bg_ok Detecting the second divided voltage Bg_buf refers to the voltage at which the first control signal V bg_ok Therefore, when the second divided voltage Bg_buf reaches the flip threshold set by the circuit, that is, the second divided voltage Bg_buf is greater than or equal to the product of the second preset voltage and the second set ratio, then the first control signal V bg_ok Flip from the first level to the second level. The second setting ratio can be 60%, 61%, 65%, 70%, 75%, 80%, etc., which can be set by yourself, and the second preset voltage V2 can be 1.2V. Assuming that the second setting ratio is 60%, that is, the second divided voltage Bg_buf≥V2*p1=1.2V*60%=0.72V can be flipped, it is considered that it is sufficient to establish the second reference voltage Vref2, and the reference voltage input to the voltage stabilizing module 30 can be switched from the first reference voltage Vref1 to the second reference voltage Vref2. The present application can change the flip threshold of the second divided voltage Bg_buf by adjusting the size of NM7 and R9, that is, raising Vgsn7 or R9 can increase V bg_okThe flip threshold of bg_buf corresponding to the flip from the first level to the second level. In order to realize that the second reference voltage providing module 20 can work under low voltage, the present application hopes that when the power supply Vs<preset working voltage Vm, the working voltage LDO_OUT=Vs (<5V) output by the voltage stabilizing module 30 can be realized. During this period, the reference voltage connected to the voltage stabilizing module 30 is the first reference voltage Vref1 output by the first reference voltage providing module 10. In order to protect the circuit, when the power supply Vs>voltage threshold 5V, the working voltage LDO_OUT output by the voltage stabilizing module 30 is equal to the minimum value of the voltage threshold, the target working voltage Vn and the power supply Vs, that is, the working voltage LDO_OUT is equal to the minimum value of the voltage threshold and the target working voltage Vn. In order to realize a small PVT variation range of the working voltage LDO_OUT output by the voltage stabilizing module 30, after the second reference voltage providing module 20 outputs the second reference voltage Vref2, it is necessary to switch the reference voltage of the voltage stabilizing module 30 from the first reference voltage Vref1 to the second reference voltage Vref2.

[0100] like Figure 3 As shown, in the first stage T1, the first reference voltage Vref1 provides a reference voltage to the voltage stabilizing module 30. The first reference voltage Vref1 is generated by the first reference voltage providing module 10 composed of a diode and a resistor. Since the first reference voltage Vref1 is affected by PVT changes, the first reference voltage Vref1 has a large variation range. The unstable first reference voltage Vref1 is used as the reference voltage input of the voltage stabilizing module 30, which will cause the working voltage LDO_OUT output by the voltage stabilizing module 30 to have a large variation range. In order to avoid this situation, when the working voltage LDO_OUT output by the voltage stabilizing module 30 reaches the preset working voltage Vm that enables the second reference voltage providing module 20 to work, the second reference voltage providing module 20 generates a second reference voltage Vref2, and the reference voltage of the voltage stabilizing module 30 is switched to the second reference voltage Vref2. Since the second reference voltage Vref2 output by the second reference voltage providing module 20 has a high accuracy and changes very little under PVT, the working voltage LDO_OUT output by the voltage stabilizing module 30 changes very little under PVT conditions when the power supply Vs> the preset working voltage Vm.

[0101] The NMOS device stacking resistor used in the first reference voltage providing module 10 of the present application can be matched with the input pair of tubes and R3 in the voltage stabilizing module 30 for process matching. After the reference voltage is switched to the second reference voltage Vref2, the first control signal V bg_ok The signal turns off PM0 and disconnects the path from Vz to ground, ensuring that HVNM1 and HVNM2, which are high-voltage devices, will not be turned off during the change of the large-signal power supply Vs, which is beneficial to improving the power supply rejection characteristics.

[0102] In the case of the maximum power supply voltage Vmax, since vref1*(R4+R5) / R4<the maximum withstand voltage Vd of the device, the working voltage LDO_OUT output by the voltage stabilizing module 30 will not exceed the maximum withstand voltage Vd of the device under PVT conditions, which greatly improves the reliability of the device. In addition, the present application only includes one voltage stabilizing module 30, and does not need to use a large area of ​​filter capacitors, voltage stabilizing capacitors and clamping circuits, thereby reducing the area of ​​the voltage stabilizing power supply circuit. In the present application, when the voltage of the power supply Vs is low, the first reference voltage Vref1 generated by the first reference voltage providing module 10 is used as the reference voltage connected to the voltage stabilizing module 30. At the same time, when the working voltage LDO_OUT output by the voltage stabilizing module 30 reaches the preset working voltage Vm that enables the second reference voltage providing module 20 to start working, the reference voltage connected to the voltage stabilizing module 30 is switched from the first reference voltage Vref1 to the second reference voltage Vref2, so that the working voltage LDO_OUT output by the voltage stabilizing module 30 has small fluctuation, high precision, and high PSRR, thereby achieving the purpose of good large signal PSRR performance.

[0103] The present application also provides a voltage stabilization implementation method, which is applied to Figures 2 to 5 Corresponding to the voltage-stabilized power supply circuit described in the embodiment, the method comprises the steps of:

[0104] The first reference voltage Vref1 output by the first reference voltage providing module 10 and the second reference voltage Vref2 output by the second reference voltage providing module 20 are connected, and the first control signal V bg_ok and a second control signal Vstb output by the voltage stabilizing module 30;

[0105] The first control signal V bg_ok Or when the second control signal Vstb is at the first level, the reference voltage control module 40 transmits the first reference voltage Vref1 output by the first reference voltage providing module 10 to the voltage stabilizing module 30, so that the voltage stabilizing module 30 outputs the corresponding working voltage LDO_OUT according to the first reference voltage Vref1 and the power supply Vs, and the power supply Vs increases from zero to the maximum power value;

[0106] The first control signal V bg_okand the second control signal Vstb is at the second level, the reference voltage control module 40 transmits the second reference voltage Vref2 output by the second reference voltage providing module 20 according to the working voltage LDO_OUT to the voltage stabilizing module 30, so that the voltage stabilizing module 30 outputs the corresponding working voltage LDO_OUT according to the second reference voltage Vref2 and the power supply Vs; the second level is greater than the first level; the second reference voltage Vref2 is less affected by external factors than the first reference voltage Vref1; the working voltage LDO_OUT is equal to the minimum value of the voltage threshold, the target working voltage Vn and the power supply Vs; the voltage threshold is equal to the product of the second reference voltage Vref2 and a preset ratio, and the preset ratio is a positive number.

[0107] The above specific implementations further describe the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above is only a specific implementation of the present application and is not limited to the protection scope of the present application. Without departing from the purpose of the basic characteristics of the present application, the present application can be embodied in various forms. Therefore, the implementation forms in the present application are used for explanation rather than limitation. Since the scope of the present application is limited by the claims rather than the specification, and all changes within the scope defined by the claims or within the equivalent scope of the scope defined by the claims should be understood to be included in the claims. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A voltage-stabilized power supply circuit, characterized in that: include: A first reference voltage providing module, a second reference voltage providing module, a voltage stabilizing module and a reference voltage control module, wherein the output end of the first reference voltage providing module is connected to the first input end of the reference voltage control module and the control end of the voltage stabilizing module, the first output end of the second reference voltage providing module is connected to the control end of the reference voltage control module and the control end of the first reference voltage providing module, the second output end of the second reference voltage providing module is connected to the input end of the voltage stabilizing module, the power input end of the second reference voltage providing module is connected to the first output end of the voltage stabilizing module, and the second output end of the voltage stabilizing module is connected to the second input end of the reference voltage control module; The first reference voltage providing module is used to access the power supply and the first control signal and output a first reference voltage, wherein the power supply increases from zero to a maximum power value; The second reference voltage providing module is used to access the working voltage and output the second reference voltage and the first control signal; the second reference voltage is less affected by external factors than the first reference voltage; The second reference voltage providing module includes a bandgap reference unit and a voltage detection unit, wherein the voltage detection unit includes an operational amplifier, a thirteenth transistor, a fourteenth transistor, a fifteenth transistor, a sixteenth transistor, a seventeenth transistor, an eighth resistor, a ninth resistor, a tenth resistor, a first hysteresis comparator, a second hysteresis comparator, a bias current source and an AND logic operator; The voltage stabilizing module is used to connect to the power supply and output a second control signal, and output a corresponding working voltage when connected to the first reference voltage, and output a corresponding working voltage when connected to the second reference voltage; The operating voltage is equal to the minimum value among the voltage threshold, the target operating voltage and the power supply; The voltage threshold is equal to the product of the second reference voltage and a preset ratio, and the preset ratio is a positive number; The reference voltage control module is used to connect the first control signal and the second control signal, and transmit the connected first reference voltage to the voltage stabilizing module when the first control signal or the second control signal is at the first level, and transmit the second reference voltage to the voltage stabilizing module when the first control signal and the second control signal are at the second level, at which time the first reference voltage is 0; the second level is greater than the first level.

2. The voltage-stabilized power supply circuit according to claim 1, characterized in that: The reference voltage control module includes: a first transistor and a second transistor; The first electrode of the first transistor is connected to the output end of the first reference voltage providing module as the first input end of the reference voltage control module to access the first reference voltage, and the second electrode of the first transistor is connected to the control end of the reference voltage control module to access the first control signal; The first electrode of the second transistor is connected to the third electrode of the first transistor, the second electrode of the second transistor is connected to the second output end of the voltage stabilizing module as the second input end of the reference voltage control module to receive the second control signal, and the third electrode of the second transistor is grounded.

3. The voltage-stabilized power supply circuit according to claim 2, characterized in that: The first reference voltage providing module includes: a first resistor, a second resistor, a third resistor, a diode, a third transistor and a fourth transistor; The first end of the first resistor is connected to the power supply, the second end of the first resistor is connected to the first end of the second resistor, the cathode of the diode is connected between the second end of the first resistor and the first end of the second resistor, and the anode of the diode is grounded; The third electrode of the third transistor is connected to the second end of the second resistor, and the second electrode of the third transistor is connected to the first output end of the second reference voltage providing module as the control end of the first reference voltage providing module to access the first control signal; The first electrode of the fourth transistor is connected to the first electrode of the third transistor and the second electrode of the fourth transistor, the third electrode of the fourth transistor is connected to the first end of the third resistor, the second end of the third resistor is connected to the third electrode of the second transistor, and the first electrode of the fourth transistor serves as the output end of the first reference voltage providing module to output the first reference voltage.

4. The voltage-stabilized power supply circuit according to claim 3, characterized in that: The voltage stabilizing module includes: a fourth resistor, a fifth resistor, a sixth resistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor and a twelfth transistor; The third electrode of the fifth transistor, the third electrode of the sixth transistor and the third electrode of the twelfth transistor are all connected to the first end of the first resistor to be connected to the power supply; The second electrode of the fifth transistor is connected to the second electrode of the sixth transistor, and the first electrode of the fifth transistor is connected to the second electrode of the fifth transistor; A first electrode of the seventh transistor is connected to a first electrode of the fifth transistor, and a second electrode of the seventh transistor is connected between a second end of the first resistor and a first end of the second resistor; The first electrode of the eighth transistor is connected to the first electrode of the sixth transistor and the second electrode of the twelfth transistor respectively, and the second electrode of the eighth transistor is connected to the second electrode of the seventh transistor; The first electrode of the ninth transistor is connected to the third electrode of the seventh transistor, the second electrode of the ninth transistor is connected between the first end of the fifth resistor and the second end of the sixth resistor, the first end of the fifth resistor and the second end of the sixth resistor are both used as the second output end of the voltage stabilizing module, the third electrode of the ninth transistor is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the third electrode of the second transistor; The first electrode of the tenth transistor is connected to the third electrode of the eighth transistor, the second electrode of the tenth transistor is connected to the first electrode of the fourth transistor as the control end of the voltage stabilizing module to access the first reference voltage, and the third electrode of the tenth transistor is connected to the third electrode of the ninth transistor; The first electrode of the eleventh transistor is connected to the first electrode of the tenth transistor, the second electrode of the eleventh transistor is connected as the input end of the voltage stabilizing module to the second output end of the second reference voltage providing module to access the second reference voltage, and the third electrode of the eleventh transistor is connected to the third electrode of the ninth transistor; The second end of the fifth resistor is connected to the second end of the fourth resistor, the first end of the fifth resistor is connected to the second end of the sixth resistor, the first end of the sixth resistor is connected to the third electrode of the eighth transistor and the first electrode of the twelfth transistor respectively, and the first electrode of the twelfth transistor serves as the first output end of the voltage stabilizing module; The preset ratio is equal to a quotient value with the resistance value of the fifth resistor as the dividend and the sum of the resistance values ​​of the fifth resistor and the sixth resistor as the divisor.

5. The voltage-stabilized power supply circuit according to claim 4, characterized in that: The voltage stabilizing module further includes: a seventh resistor, a first capacitor, a second capacitor and a third capacitor; The first end of the first capacitor is connected between the third electrode of the sixth transistor and the third electrode of the twelfth transistor, the second end of the first capacitor is connected to the first end of the seventh resistor, and the second end of the seventh resistor is connected between the first electrode of the sixth transistor and the second electrode of the twelfth transistor; The first end of the second capacitor is connected between the third electrode of the eighth transistor and the first electrode of the tenth transistor, and the second end of the second capacitor is connected between the first electrode of the twelfth transistor and the first end of the sixth resistor; A first end of the third capacitor is connected between the first electrode of the twelfth transistor and the second end of the second capacitor, and a second end of the third capacitor is grounded.

6. The voltage-stabilized power supply circuit according to claim 4, characterized in that: When the power supply is equal to the minimum power supply voltage, the first reference voltage is greater than or equal to the product result corresponding to the minimum power supply voltage and the reciprocal of the preset ratio; When the power supply is equal to the maximum power supply voltage, the first reference voltage is less than the product of the maximum withstand voltage of the device and the inverse of the preset ratio.

7. The voltage-stabilized power supply circuit according to claim 1, characterized in that: The bandgap reference unit and the voltage detection unit are both connected to the first output end of the voltage stabilizing module, the voltage detection unit is connected to the bandgap reference unit, and the voltage detection unit is connected to the control end of the reference voltage control module and the input end of the voltage stabilizing module; The bandgap reference unit is used to access the working voltage output by the voltage stabilization module, and output a bias current source and a first voltage signal when the working voltage is equal to a preset working voltage; The voltage detection unit is used to access the bias current source, the first voltage signal and the working voltage output by the voltage stabilizing module, and output the second reference voltage to the input end of the voltage stabilizing module, and output the first control signal to the control end of the reference voltage control module.

8. The voltage-stabilized power supply circuit according to claim 7, characterized in that: The inverting input terminal of the operational amplifier is connected to the first voltage signal, the power input terminal of the operational amplifier is connected to the first output terminal of the voltage stabilizing module as the power input terminal of the second reference voltage providing module to connect to the working voltage, the non-inverting input terminal of the operational amplifier is connected between the second end of the eighth resistor and the first end of the ninth resistor, the output terminal of the operational amplifier is connected to the second electrode of the thirteenth transistor, and the second end of the ninth resistor is grounded; The third electrode of the thirteenth transistor is connected to the first output end of the voltage stabilizing module as the power input end of the second reference voltage providing module to access the working voltage, the first electrode of the thirteenth transistor is connected to the first end of the eighth resistor, and the first electrode of the thirteenth transistor is used as the second output end of the second reference voltage providing module to output the second reference voltage; The first end of the bias current source is connected to the third electrode of the thirteenth transistor, the second end of the bias current source is connected to the first electrode of the seventeenth transistor, the second electrode of the seventeenth transistor is connected to the first end of the ninth resistor, the third electrode of the seventeenth transistor is connected to the first end of the tenth resistor, and the second end of the tenth resistor is grounded; The input terminal of the first hysteresis comparator is connected between the second terminal of the bias current source and the first electrode of the seventeenth transistor, and the output terminal of the first hysteresis comparator is connected to the second electrode of the fifteenth transistor; The third electrode of the fourteenth transistor is connected to the third electrode of the thirteenth transistor, the second electrode of the fourteenth transistor is connected to the second electrode of the thirteenth transistor, and the first electrode of the fourteenth transistor is connected to the first electrode of the sixteenth transistor; The second electrode of the sixteenth transistor is connected to the second electrode of the fourteenth transistor, the third electrode of the sixteenth transistor is connected to the first electrode of the fifteenth transistor, and the third electrode of the fifteenth transistor is grounded; The input end of the second hysteresis comparator is connected between the first electrode of the fourteenth transistor and the first electrode of the sixteenth transistor, the output end of the second hysteresis comparator is connected to the first input end of the AND logic operator, the second input end of the AND logic operator is connected to the output end of the first hysteresis comparator, and the output end of the AND logic operator is connected to the control end of the reference voltage control module and the control end of the first reference voltage providing module as the first output end of the second reference voltage providing module to output the first control signal.

9. The voltage-stabilized power supply circuit according to claim 1, characterized in that: When the power supply is less than a preset working voltage, the first control signal is at the first level, and when the power supply is greater than the preset working voltage, the first control signal is at the second level, and the preset working voltage is less than the voltage threshold.

10. The voltage-stabilized power supply circuit according to claim 1, characterized in that: When the voltage stabilizing module is connected to the second reference voltage, the second reference voltage output by the second reference voltage providing module is equal to the product of the first preset voltage and the first set ratio.

11. The voltage-stabilized power supply circuit according to claim 8, characterized in that: Before the first control signal switches from the first level to the second level, the second divided voltage connected to the second electrode of the seventeenth transistor is greater than or equal to the product of the second preset voltage and the second set ratio.

12. An electronic device, characterized in that: The electronic device comprises the stabilized power supply circuit according to any one of claims 1 to 11.

13. A method for achieving voltage stabilization, characterized in that: Applied to the voltage regulated power supply circuit according to any one of claims 1 to 11, the method comprises the steps of: Accessing a first reference voltage output by the first reference voltage providing module and a second reference voltage output by the second reference voltage providing module, and accessing a first control signal output by the second reference voltage providing module and a second control signal output by the voltage stabilizing module; When the first control signal or the second control signal is at a first level, the reference voltage control module transmits the first reference voltage output by the first reference voltage providing module to the voltage stabilizing module, so that the voltage stabilizing module outputs a corresponding operating voltage according to the first reference voltage and the power supply, and the power supply increases from zero to a maximum power value; When the first control signal and the second control signal are at the second level, the reference voltage control module transmits the second reference voltage output by the second reference voltage providing module according to the working voltage to the voltage stabilizing module, so that the voltage stabilizing module outputs a corresponding working voltage according to the second reference voltage and the power supply; the second level is greater than the first level; the second reference voltage is less affected by external factors than the first reference voltage; The operating voltage is equal to the minimum value among the voltage threshold, the target operating voltage and the power supply; The voltage threshold is equal to the product of the second reference voltage and a preset ratio, and the preset ratio is a positive number.

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