Output voltage self-adaptive adjusting circuit, linear power supply circuit and chip

Abstract

The invention relates to the technical field of power supply circuits, in particular to an output voltage self-adaptive adjusting circuit, a linear power supply circuit and a chip. The adaptive adjustment circuit comprises a voltage sampling circuit, a current sampling circuit, a current mirror circuit, a feedback adjustment circuit and an adjustment compensation circuit, and the current sampling circuit is used for sampling the magnitude and current change information of a load current at a voltage output end to obtain a first current; the current mirror circuit is used for obtaining second current according to the first current, and the feedback adjusting circuit is used for receiving reference voltage and feedback voltage and obtaining a first adjusting signal according to the reference voltage and the feedback voltage under triggering of the second current so as to adjust the first output voltage. When the load of the output end is in a light load state, the second current can be adaptively and dynamically reduced to save the overall power consumption of the circuit, and when the load of the output end is in a heavy load state, the second current can be adaptively increased to improve the response speed of feedback adjustment, thereby ensuring the stability of the circuit.

Description

Technical Field

[0001] The present application relates to the technical field of power supply circuits, and in particular to an output voltage adaptive regulation circuit, a linear power supply circuit, and a chip. Background Art

[0002] A linear power supply stabilizes the output voltage mainly by operating the power tube in the linear region or saturation region. The power tube acts like a variable resistor, adjusting its own resistance value according to the difference between the input voltage and the output voltage to keep the output voltage stable. Figure 1 For the linear power supply circuit structure diagram provided for related technologies, please refer to Figure 1 As shown, the linear power supply circuit provided by the related art mainly includes a power tube M1, a second error amplifier 13, and a feedback voltage sampling circuit; wherein the power tube M1 can be an NMOS (N-Metal-Oxide-Semiconductor) tube, the drain of the power tube M1 is used to receive the first input voltage VIN1, the source of the power tube M1 is used to output the second output voltage Vout2, the source of the power tube M1 is used to connect to the load, and the gate of the power tube M1 is connected to the output end of the second error amplifier 13. wherein the feedback voltage sampling circuit includes an eleventh resistor R11 and a twelfth resistor R12, the first end of the eleventh resistor R11 is connected to the source of the power tube M1, the second end of the eleventh resistor R11 is connected to the first end of the twelfth resistor R12, and the second end of the twelfth resistor R12 is grounded GND. The divided voltage at the first end of the twelfth resistor R12 is sampled as the first feedback voltage Vfb1. The negative input of the second error amplifier 13 is configured to receive the first feedback voltage Vfb1. The positive input of the second error amplifier 13 is configured to receive the first reference voltage Vref1. The power supply terminal of the second error amplifier 13 is configured to receive the first power supply voltage VBIAS. The second error amplifier 13 amplifies the difference between the first feedback voltage Vfb1 and the first reference voltage Vref1 to generate a voltage regulation signal. The on-resistance of the power transistor M1 is adjusted based on the voltage regulation signal, thereby adjusting the second output voltage Vout2 outputted from the source of the power transistor M1.

[0003] in accordance with Figure 1 In the linear power supply provided by the related art shown, under light load and heavy load conditions, except for the load current on the source of the power tube M1, the control current on the second error amplifier 13 hardly changes. As a result, if the control current in the circuit is small, it is difficult for the second error amplifier 13 to achieve a fast response speed, that is, the response speed of the feedback control is slow. If the control current in the circuit is large, although the response speed of the second error amplifier 13 can be improved, the operating efficiency of the linear power supply is seriously affected, especially under light load, the efficiency of the linear power supply will be even lower. Summary of the Invention

[0004] The present application provides an output voltage adaptive regulation circuit, a linear power supply circuit, and a chip to solve the technical problems in the related art where a linear power supply has a slow response speed of feedback control when the control current is small, and has a low efficiency when the control current is large.

[0005] In a first aspect, the present application provides an output voltage adaptive regulation circuit for use in a linear power supply circuit, the linear power supply circuit comprising a main control module configured to receive an input voltage and regulate the input voltage to output a first output voltage; the adaptive regulation circuit comprising: a voltage sampling circuit, a current sampling circuit, a current mirror circuit, a feedback regulation circuit, and a regulation compensation circuit;

[0006] The voltage sampling circuit is connected to the voltage output terminal and the feedback regulation circuit respectively, the current sampling circuit is connected to the voltage output terminal and the current mirror circuit respectively, the current mirror circuit is connected to the feedback regulation circuit and the regulation compensation circuit respectively, and the regulation compensation circuit is connected to the feedback regulation circuit and the main control module respectively;

[0007] The voltage sampling circuit is used to sample the feedback voltage of the voltage output terminal, and the feedback voltage is used to represent the magnitude and voltage change information of the first output voltage;

[0008] The current sampling circuit is used to sample the magnitude and current change information of the load current at the voltage output end to obtain a first current;

[0009] The current mirror circuit is configured to obtain a second current according to the first current, and output the second current to the feedback regulation circuit;

[0010] The feedback regulation circuit is configured to receive a reference voltage and the feedback voltage, and obtain a first regulation signal according to the reference voltage and the feedback voltage when triggered by the second current;

[0011] The regulation and compensation circuit is used to perform signal compensation on the first regulation signal to obtain a second regulation signal, and output the second regulation signal to the control terminal of the main control module;

[0012] The main control module is configured to adjust the first output voltage according to the second adjustment signal.

[0013] In one possible design, the main control module includes a first transistor, wherein a first electrode of the first transistor is used to receive an input voltage, and a second electrode of the first transistor is used as a voltage output terminal for outputting a first output voltage; the regulation and compensation circuit is respectively connected to the feedback regulation circuit and the control electrode of the first transistor;

[0014] The regulation and compensation circuit is used to output the second regulation signal to the control electrode of the first transistor; the first transistor is used to regulate the first output voltage according to the second regulation signal.

[0015] In one possible design, the current sampling circuit includes a current sampling module, a second transistor, and a third transistor;

[0016] The first electrode of the second transistor is used to receive the input voltage, the control electrode of the second transistor is connected to the control electrode of the first transistor, and the second electrode of the second transistor is respectively connected to the second electrode and the control electrode of the third transistor; the sampling end of the current sampling module is connected to the voltage output end, the output end of the current sampling module is also connected to the second electrode of the third transistor, and the first electrode of the third transistor is grounded;

[0017] The second transistor is used to sample a fourth current flowing through the first transistor, and the current sampling module is used to sample a fifth current on the voltage output terminal; the third transistor is used to generate the first current according to the fourth current and the fifth current.

[0018] In one possible design, the feedback regulation circuit includes a first error amplifier;

[0019] The negative input terminal of the first error amplifier is connected to the output terminal of the voltage sampling circuit to receive the feedback voltage sampled by the voltage sampling circuit; the positive input terminal of the first error amplifier is used to receive the reference voltage; the power supply terminal of the first error amplifier is used to receive the input voltage; and the compensation signal input terminal of the first error amplifier is used to receive the second current;

[0020] The first error amplifier is used to compare the feedback voltage with the reference voltage under the triggering of the second current to obtain a voltage error signal, and amplify the voltage error signal to obtain the first adjustment signal.

[0021] In one possible design, the adjustment and compensation circuit includes a first capacitor and a buffer;

[0022] The first end of the first capacitor is connected to the output end of the first error amplifier, and the second end of the first capacitor is grounded; the output end of the first error amplifier is connected to the input end of the buffer, and the output end of the buffer is connected to the control electrode of the first transistor; the power supply end of the buffer is used to receive the input voltage.

[0023] In one possible design, the current mirror circuit is further configured to obtain a third current based on the first current;

[0024] The regulation and compensation circuit further includes a second capacitor, a first end of the second capacitor is connected to the output end of the first error amplifier, and a second end of the second capacitor is used to receive the third current.

[0025] In one possible design, the adjustment and compensation circuit further includes a third capacitor and a first resistor;

[0026] A first end of the first resistor is connected to the output end of the first error amplifier, a second end of the first resistor is connected to the first end of the third capacitor, and a second end of the third capacitor is grounded.

[0027] In one possible design, the current mirror circuit is further used to obtain a fourth current based on the first current; and the bias current terminal of the buffer is used to receive the fourth current.

[0028] In one possible design, the current mirror circuit includes a fourth transistor, a fifth transistor, and a sixth transistor;

[0029] a control electrode of the fourth transistor connected to the control electrode of the third transistor, a first electrode of the fourth transistor grounded, and a second electrode of the fourth transistor connected to the compensation signal input terminal of the first error amplifier; the fourth transistor is configured to mirror the first current to obtain the second current;

[0030] a control electrode of the fifth transistor connected to the control electrode of the third transistor, a first electrode of the fifth transistor being grounded, and a second electrode of the fifth transistor being connected to the second end of the second capacitor; the fifth transistor being configured to mirror the first current to obtain the third current;

[0031] The control electrode of the sixth transistor is connected to the control electrode of the third transistor, the first electrode of the sixth transistor is grounded, and the second electrode of the sixth transistor is connected to the second end of the second capacitor; the sixth transistor is used to mirror the first current to obtain the fourth current.

[0032] In a second aspect, the present application further provides a linear power supply circuit, comprising a main control module and an output voltage adaptive regulation circuit as described in any one of the above items, wherein the main control module is configured to receive an input voltage and regulate the input voltage to output a first output voltage;

[0033] The output voltage adaptive regulation circuit is connected to the voltage output terminal and the control electrode of the first transistor respectively.

[0034] In a third aspect, the present application further provides a chip, which includes the output voltage adaptive regulation circuit as described in any one of the above items.

[0035] The output voltage adaptive regulation circuit provided by the first aspect is used in a linear power supply circuit. The adaptive regulation circuit includes: a voltage sampling circuit, a current sampling circuit, a current mirror circuit, a feedback regulation circuit, and a regulation compensation circuit; the voltage sampling circuit is respectively connected to the voltage output end and the feedback regulation circuit, the load detection circuit is respectively connected to the voltage output end and the current mirror circuit, the current mirror circuit is respectively connected to the feedback regulation circuit and the regulation compensation circuit, and the regulation compensation circuit is respectively connected to the feedback regulation circuit and the control end of the main control module. The voltage sampling circuit is used to sample the feedback voltage at the voltage output terminal, and the feedback voltage is used to represent the magnitude and voltage change information of the first output voltage; the current sampling circuit is used to sample the magnitude and current change information of the load current at the voltage output terminal to obtain the first current; the current mirror circuit is used to obtain the second current based on the first current and output the second current to the feedback regulation circuit; the feedback regulation circuit is used to receive the reference voltage and the feedback voltage, and when triggered by the second current, obtain a first regulation signal based on the reference voltage and the feedback voltage; the regulation compensation circuit is used to perform signal compensation on the first regulation signal to obtain a second regulation signal, and output the second regulation signal to the control terminal of the main control module; the main control module is used to regulate the first output voltage based on the second regulation signal. It can be seen that according to the output voltage adaptive regulation circuit provided by the present application, when the load at the voltage output terminal changes, the magnitude and current change information of the load current can be sampled by the current sampling circuit and the current mirror circuit, thereby obtaining the second current; the feedback regulation circuit, when triggered by the second current, obtains the first regulation signal based on the reference voltage and the feedback voltage, thereby regulating the first output voltage. In this way, when the load at the output end is in a light load state, the second current can be adaptively and dynamically adjusted to a smaller value to save the overall power consumption of the circuit. When the load at the output end is in a heavy load state, the second current can be adaptively and dynamically adjusted to a larger value to improve the response speed of the feedback regulation, thereby ensuring the stability of the circuit.

[0036] The beneficial effects provided in the above-mentioned second aspect and the various possible designs of the above-mentioned second aspect can be referred to the beneficial effects brought about by the above-mentioned first aspect and the various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of a linear power supply circuit structure provided for related technologies;

[0038] Figure 2 This is one of the schematic diagrams of the output voltage adaptive regulation circuit structure provided in an embodiment of the present application;

[0039] Figure 3 This is a second schematic diagram of the output voltage adaptive regulation circuit structure provided in an embodiment of the present application;

[0040] Figure 4 This is the third schematic diagram of the output voltage adaptive regulation circuit structure provided in an embodiment of the present application;

[0041] Figure 5 This is a fourth schematic diagram of the output voltage adaptive regulation circuit structure provided in an embodiment of the present application;

[0042] Figure 6 This is the fifth structural diagram of the output voltage adaptive regulation circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In this application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a alone, b alone, or c alone can represent: a alone, b alone, c alone, a and b in combination, a and c in combination, b and c in combination, or a, b, and c in combination, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0044] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present application.

[0045] The terms "connected" and "connect" should be interpreted broadly. For example, "connected" or "connected" in a circuit structure can refer not only to a physical connection, but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate component, as long as the circuit is interconnected. It can also refer to internal connectivity between two components. Signal connection can refer not only to signal connection through circuits but also to signal connection through media, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application on a case-by-case basis.

[0046] The transistor in this application is a three-terminal transistor, whose three terminals are a control electrode, a first electrode, and a second electrode. The transistor can be a bipolar transistor or a field-effect transistor, etc. For example, when the transistor is a bipolar transistor, its control electrode refers to the base of the bipolar transistor, the first electrode can be the collector or emitter of the bipolar transistor, and the corresponding second electrode can be the emitter or collector of the bipolar transistor; when the transistor is a field-effect transistor, its control electrode refers to the gate of the field-effect transistor, the first electrode can be the drain or source of the field-effect transistor, and the corresponding second electrode can be the source or drain of the field-effect transistor.

[0047] A linear power supply (LPS) first reduces the voltage amplitude of AC power through a transformer, then rectifies it through a rectifier circuit to generate pulsed DC power. This is then filtered to produce a DC voltage with minimal ripple. To achieve high-precision DC voltage, it must be stabilized by a voltage regulator circuit. In related technologies, linear power supplies primarily stabilize output voltage by operating power transistors in their linear amplification region. A power transistor acts like a variable resistor, adjusting its resistance according to the difference between the input and output voltages to maintain a stable output voltage.

[0048] in accordance with Figure 1In the linear power supply provided by the related art shown, when the load on the source of the power transistor M1 changes, the load current at the source of the power transistor M1 and the second output voltage Vout2 change, thereby causing the sampled first feedback voltage Vfb1 to change accordingly. The second error amplifier 13 amplifies the difference between the first feedback voltage Vfb1 and the first reference voltage Vref1 to generate a voltage regulation signal. Based on this voltage regulation signal, the on-resistance of the power transistor M1 can be adjusted, thereby feedback-regulating the second output voltage Vout2 output from the source of the power transistor M1. Then, when the load on the source of the power transistor M1 changes, except for the load current at the source of the power transistor M1, which does not change, the control current of the second error amplifier 13 hardly changes. That is, the control current of the second error amplifier 13 is generally set to a fixed value and does not change with changes in the load current. Thus, if the control current in the circuit is small, it is difficult for the second error amplifier 13 to achieve a fast response speed, which results in a slow response speed of the feedback control. If the control current in the circuit is large, although the response speed of the second error amplifier 13 can be improved, the working efficiency of the linear power supply is seriously affected, especially under light load, the efficiency of the linear power supply will be even lower.

[0049] In order to overcome the deficiencies in the above-mentioned related art, the present application provides an output voltage adaptive regulation circuit, which includes: a voltage sampling circuit, a current sampling circuit, a current mirror circuit, a feedback regulation circuit, and a regulation compensation circuit; the voltage sampling circuit is respectively connected to the voltage output terminal and the feedback regulation circuit, the load detection circuit is respectively connected to the voltage output terminal and the current mirror circuit, the current mirror circuit is respectively connected to the feedback regulation circuit and the regulation compensation circuit, and the regulation compensation circuit is respectively connected to the feedback regulation circuit and the control electrode of the first transistor. Among them, the voltage sampling circuit is used to sample the feedback voltage at the voltage output terminal, and the feedback voltage is used to represent the magnitude and voltage change information of the first output voltage; the current sampling circuit is used to sample the magnitude and current change information of the load current at the voltage output terminal to obtain a first current; the current mirror circuit is used to obtain a second current based on the first current and output the second current to the feedback regulation circuit; the feedback regulation circuit is used to receive a reference voltage and a feedback voltage, and when triggered by the second current, obtain a first regulation signal based on the reference voltage and the feedback voltage; the regulation compensation circuit is used to perform signal compensation on the first regulation signal to obtain a second regulation signal, and output the second regulation signal to the control terminal of the main control module; the main control module uses the second regulation signal to regulate the first output voltage. As can be seen, the output voltage adaptive regulation circuit provided by the present application, through the current sampling circuit and the current mirror circuit, can sample the load current magnitude and current change information when the load at the voltage output terminal changes, thereby obtaining a second current. The feedback regulation circuit, triggered by the second current, generates a first regulation signal based on the reference voltage and the feedback voltage, thereby regulating the first output voltage. In this way, when the load at the output terminal is lightly loaded, the second current can be adaptively and dynamically reduced to save the overall power consumption of the circuit. When the load at the output terminal is heavily loaded, the second current can be adaptively and dynamically increased to improve the response speed of the feedback regulation, thereby ensuring the stability of the circuit.

[0050] Figure 2 This is one of the schematic diagrams of the output voltage adaptive regulation circuit provided in the embodiment of the present application, see Figure 2As shown, the output voltage adaptive regulation circuit is used in a linear power supply circuit. The input end of the linear power supply circuit is used to receive the input voltage VIN. The linear power supply circuit includes a main control module and a voltage output end, and the voltage output end is used to output a first output voltage VOUT1. The adaptive regulation circuit provided in this embodiment includes: a voltage sampling circuit 20, a current sampling circuit 21, a current mirror circuit 22, a feedback regulation circuit 24, and a regulation compensation circuit 23. The voltage sampling circuit 20 is respectively connected to the voltage output end and the feedback regulation circuit 24, the current sampling circuit 21 is respectively connected to the voltage output end and the current mirror circuit 22, the current mirror circuit 22 is respectively connected to the feedback regulation circuit 24 and the regulation compensation circuit 23, and the regulation compensation circuit 23 is connected to the feedback regulation circuit 24.

[0051] Among them, the voltage sampling circuit 20 is used to sample the feedback voltage Vfb at the voltage output end, and the feedback voltage Vfb is used to characterize the size and voltage change information of the first output voltage VOUT1; the current sampling circuit 21 is used to sample the size and current change information of the load current at the voltage output end to obtain the first current; the current mirror circuit 22 is used to obtain the second current based on the first current and output the second current to the feedback regulation circuit; the feedback regulation circuit 24 is used to receive the reference voltage and the feedback voltage Vfb, and under the triggering of the second current, obtain a first regulation signal based on the reference voltage and the feedback voltage Vfb; the regulation compensation circuit 23 is used to perform signal compensation on the first regulation signal to obtain a second regulation signal, and output the second regulation signal to the control end of the main control module; the main control module is used to regulate the first output voltage VOUT1 according to the second regulation signal.

[0052] In which, the main control module may include a voltage conversion circuit, so that the main control module can adjust the input voltage VIN according to the second adjustment signal to output the adjusted first output voltage VOUT1; for example, the main control module can step down or step up the input voltage VIN to obtain the processed first output voltage VOUT1.

[0053] In one embodiment, the current mirror circuit 22 can amplify the first current according to a preset amplification ratio to obtain a second current; in this way, the magnitude of the second current is proportional to the magnitude of the first current, and the second current and the first current have the same change rate and change trend. For example, when the load current at the voltage output terminal increases, the first current and the second current will also increase accordingly; when the load current at the voltage output terminal decreases, the first current and the second current will also decrease accordingly; and when the load current at the voltage output terminal changes rapidly, such as when the load current increases or decreases rapidly, the first current and the second current will also change rapidly accordingly.

[0054] In one embodiment, the feedback regulation circuit 24 may first obtain a voltage difference according to the reference voltage and the feedback voltage Vfb, and then amplify the voltage difference to obtain the first regulation signal.

[0055] In one embodiment, the adjustment compensation circuit 23 may be a compensation network including resistors and capacitors to perform pole stability compensation on the circuit to improve the stability of the circuit.

[0056] In one embodiment, the regulation compensation circuit 23 also functions as a buffer, that is, the regulation compensation circuit 23 can perform signal shielding and signal following processing on the first regulation signal output by the feedback regulation circuit 24 to ensure the stability of the first regulation signal.

[0057] It can be understood that when the load current on the voltage output end of the linear power supply circuit decreases, the first current and the second current will also decrease accordingly. When the second current decreases, the power consumed by the feedback regulation circuit 24 is smaller, thereby saving the overall power consumption of the circuit; when the load current on the voltage output end of the linear power supply circuit increases, the first current and the second current will also increase accordingly. When the second current increases, it is equivalent to quickly powering the feedback regulation circuit 24, thereby improving the response speed of the feedback regulation circuit 24, that is, the feedback regulation circuit 24 can quickly output the first regulation signal, thereby improving the feedback regulation efficiency of the circuit.

[0058] Similarly, when the magnitude of the load current on the voltage output end of the linear power supply circuit changes too quickly, the first current and the second current will also change rapidly, which will also quickly adjust the current on the feedback regulation circuit 24, thereby improving the response speed of the feedback regulation circuit 24. That is, the feedback regulation circuit 24 can quickly output the first regulation signal, thereby improving the feedback regulation efficiency of the circuit.

[0059] According to the output voltage adaptive regulation circuit provided by the present application, when the load at the voltage output terminal changes, the load current magnitude and current change information can be sampled by the current sampling circuit 21 and the current mirror circuit 22, thereby obtaining a second current. When triggered by the second current, the feedback regulation circuit 24 generates a first regulation signal based on the reference voltage and the feedback voltage Vfb, thereby regulating the first output voltage. In this way, when the load at the output terminal is lightly loaded, the second current can be adaptively and dynamically reduced to save the overall power consumption of the circuit. When the load at the output terminal is heavily loaded, the second current can be adaptively and dynamically increased to improve the response speed of the feedback regulation, thereby ensuring the stability of the circuit.

[0060] Figure 3 For the second schematic diagram of the output voltage adaptive regulation circuit structure provided in the embodiment of the present application, please refer to Figure 3As shown, the output voltage adaptive regulation circuit is used in a linear power supply circuit, which includes a main control module 31. The main control module 31 is used to receive an input voltage VIN and perform voltage regulation on the input voltage VIN to output a first output voltage VOUT1. The adaptive regulation circuit provided in this embodiment includes: a voltage sampling circuit 20, a current sampling circuit 21, a current mirror circuit 22, a feedback regulation circuit 24, and a regulation compensation circuit 23. Among them, the voltage sampling circuit 20 is respectively connected to the voltage output end and the feedback regulation circuit 24, the current sampling circuit 21 is respectively connected to the voltage output end and the current mirror circuit 22, the current mirror circuit 22 is respectively connected to the feedback regulation circuit 24 and the regulation compensation circuit 23, and the regulation compensation circuit 23 is connected to the output end of the feedback regulation circuit 24. The current sampling circuit 21 and the current mirror circuit 22 are both electrically connected to the main control module 31.

[0061] Among them, the voltage sampling circuit 20 is used to sample the feedback voltage Vfb at the voltage output end, and the feedback voltage Vfb is used to characterize the size and voltage change information of the first output voltage VOUT1; the current sampling circuit 21 is used to sample the size and current change information of the load current at the voltage output end to obtain the first current; the current mirror circuit 22 is used to obtain the second current based on the first current and output the second current to the feedback regulation circuit; the feedback regulation circuit 24 is used to receive the reference voltage Vref and the feedback voltage Vfb, and under the triggering of the second current, obtain a first regulation signal based on the reference voltage Vref and the feedback voltage Vfb; the regulation compensation circuit 23 is used to perform signal compensation on the first regulation signal to obtain a second regulation signal, and output the second regulation signal to the control end of the main control module 31; the main control module 31 is used to regulate the first output voltage VOUT1 according to the second regulation signal.

[0062] Among them, the main function of the main control module 31 in this embodiment is to receive a control signal to adjust the voltage value of the first output voltage VOUT1 at the output end; therefore, in order to achieve this technical effect, in some embodiments, the main control module 31 can be implemented by a metal oxide semiconductor field effect transistor (Metal-Oxide-Semiconductor, referred to as MOS tube), by controlling the on-off frequency of the metal oxide semiconductor field effect transistor to adjust the voltage value of the first output voltage VOUT1 at the output end; or the main control module 31 can be implemented by a controlled resistor, by adjusting the resistance value of the controlled resistor to adjust the voltage value of the first output voltage VOUT1.

[0063] Specifically, the main control module 31 of this embodiment includes a first transistor Q1, which can be any one of a PMOS (P-Metal-Oxide-Semiconductor, P-type metal oxide semiconductor field effect transistor) tube or an NMOS (N-Metal-Oxide-Semiconductor, N-type metal oxide semiconductor field effect transistor) tube.

[0064] Among them, the first electrode of the first transistor Q1 is used to receive the input voltage VIN, the second electrode of the first transistor Q1 is a voltage output end, and the voltage output end is used to output the first output voltage VOUT1; the adjustment compensation circuit 23 is respectively connected to the feedback adjustment circuit 24 and the control electrode of the first transistor Q1; the adjustment compensation circuit 23 is used to output the second adjustment signal to the control electrode of the first transistor Q1; the first transistor Q1 is used to adjust the first output voltage VOUT1 according to the second adjustment signal.

[0065] Please continue to see Figure 3 As shown, in this embodiment, the first electrode of the first transistor Q1 is used to receive the input voltage VIN, and the second electrode of the first transistor Q1 is a voltage output terminal, which is used to output a first output voltage VOUT1. The adaptive regulation circuit provided in this embodiment includes: a voltage sampling circuit 20, a current sampling circuit 21, a current mirror circuit 22, a feedback regulation circuit 24, and a regulation compensation circuit 23. The voltage sampling circuit 20 is respectively connected to the voltage output terminal and the feedback regulation circuit 24, the current sampling circuit 21 is respectively connected to the voltage output terminal and the current mirror circuit 22, the current mirror circuit 22 is respectively connected to the feedback regulation circuit 24 and the regulation compensation circuit 23, and the regulation compensation circuit 23 is connected to the output terminal of the feedback regulation circuit 24.

[0066] Among them, the voltage sampling circuit 20 is used to sample the feedback voltage Vfb at the voltage output end, and the feedback voltage Vfb is used to characterize the size and voltage change information of the first output voltage VOUT1; the current sampling circuit 21 is used to sample the size and current change information of the load current at the voltage output end to obtain a first current; the current mirror circuit 22 is used to obtain a second current based on the first current and output the second current to the feedback regulation circuit; the feedback regulation circuit 24 is used to receive the reference voltage Vref and the feedback voltage Vfb, and under the triggering of the second current, obtain a first regulation signal based on the reference voltage Vref and the feedback voltage Vfb; the regulation compensation circuit 23 is used to perform signal compensation on the first regulation signal to obtain a second regulation signal, and output the second regulation signal to the control electrode of the first transistor Q1; the first transistor Q1 is used to regulate the first output voltage VOUT1 according to the second regulation signal.

[0067] In this embodiment, the first transistor Q1 can be a PMOS (P-Metal-Oxide-Semiconductor) transistor. For example, when the first transistor Q1 is a PMOS transistor, its first electrode is a source electrode, its second electrode is a drain electrode, and its control electrode is a gate electrode.

[0068] According to the output voltage adaptive regulation circuit provided by the present application, when the load at the voltage output terminal changes, the current sampling circuit 21 can sample the load current magnitude and current change information through the current sampling circuit 21 and the current mirror circuit 22, thereby obtaining a second current. When triggered by the second current, the feedback regulation circuit 24 generates a first regulation signal based on the reference voltage Vref and the feedback voltage Vfb, thereby regulating the first output voltage VOUT1. In this way, when the load at the output terminal is lightly loaded, the second current can be adaptively and dynamically reduced to save the overall power consumption of the circuit. When the load at the output terminal is heavily loaded, the second current can be adaptively and dynamically increased to improve the response speed of the feedback regulation, thereby ensuring the stability of the circuit.

[0069] Figure 4 For the third schematic diagram of the output voltage adaptive regulation circuit structure provided in the embodiment of the present application, please refer to Figure 4 As shown, the output voltage adaptive regulation circuit is used in a linear power supply circuit. The linear power supply circuit includes a first transistor Q1. The first electrode of the first transistor Q1 is used to receive an input voltage VIN. The second electrode of the first transistor Q1 serves as a voltage output terminal, which is used to output a first output voltage VOUT1. The adaptive regulation circuit provided in this embodiment includes: a voltage sampling circuit 20, a current sampling circuit 21, a current mirror circuit 22, a feedback regulation circuit 24, and a regulation compensation circuit 23.

[0070] Continuing with Figure 4, the current sampling circuit 21 includes a current sampling module 211, a second transistor Q2, and a third transistor Q3. The first electrode of the second transistor Q2 is used to receive the input voltage VIN, the control electrode of the second transistor Q2 is connected to the control electrode of the first transistor Q1, and the second electrode of the second transistor Q2 is connected to the second electrode and the control electrode of the third transistor Q3, respectively. The sampling terminal of the current sampling module 211 is connected to the voltage output terminal, and the output terminal of the current sampling module 211 is also connected to the second electrode of the third transistor Q3. The first electrode of the third transistor Q3 is grounded GND. The second transistor Q2 is used to sample the fourth current flowing through the first transistor Q4, and the current sampling module 211 is used to sample the fifth current at the voltage output terminal. The third transistor Q3 is used to generate the first current I1 based on the fourth and fifth currents.

[0071] It is understandable that Figure 4The second transistor Q2 and the first transistor Q1 form a current mirror structure, and in this embodiment, the size of the first transistor Q1 is larger than that of the second transistor Q2, so the current flowing through the second transistor Q2 is smaller than the current flowing through the first transistor Q1.

[0072] In this embodiment, the fourth current on the first transistor Q1 can be directly sampled through the second transistor Q2. This fourth current can reflect the fourth current during or before adjustment of the first transistor Q1. At the same time, the fifth current after adjustment can be directly sampled through the current sampling module 211. The fourth current and the fifth current are then combined through the third transistor Q3 to obtain the first current. It can be understood that the fourth current sampled through the second transistor Q2 can directly reflect the current change in the first transistor Q1, and the fifth current sampled through the current sampling module 211 can indirectly reflect the current condition in the first transistor Q1. These two current sampling methods can more quickly and accurately sample the change in the load current.

[0073] The second transistor Q2 in this embodiment may be a PMOS (P-Metal-Oxide-Semiconductor) transistor. When the second transistor Q2 is a PMOS transistor, its first electrode is a source electrode, its second electrode is a drain electrode, and its control electrode is a gate electrode. The third transistor Q3 in this embodiment may be an NMOS (N-Metal-Oxide-Semiconductor) transistor. When the third transistor Q3 is an NMOS transistor, its first electrode is a source electrode, its second electrode is a drain electrode, and its control electrode is a gate electrode.

[0074] Please continue to see Figure 4 As shown, the feedback regulation circuit 24 provided in this embodiment includes a first error amplifier 242; the negative input terminal of the first error amplifier 242 is connected to the output terminal of the voltage sampling circuit 20 to receive the feedback voltage Vfb sampled by the voltage sampling circuit 20; the positive input terminal of the first error amplifier 242 is used to receive the reference voltage Vref; the power supply terminal of the first error amplifier 242 is used to receive the input voltage VIN, and the compensation signal input terminal of the first error amplifier 242 is used to receive the second current I2; the first error amplifier 242 is used to compare the feedback voltage Vfb and the reference voltage Vref under the triggering of the second current I2 to obtain a voltage error signal, and amplify the voltage error signal to obtain a first regulation signal VEA.

[0075] The power supply terminal of the first error amplifier 242 is configured to receive an input voltage VIN, which is used to power the first error amplifier 242. Meanwhile, the compensation signal input terminal of the first error amplifier 242 is configured to receive a second current I2, which is equivalent to a control current and provides a bias current required for the operation of the first error amplifier 242. The larger the value of the second current I2, the faster the response speed of the first error amplifier 242, while the smaller the value of the second current I2, the slower the response speed of the first error amplifier 242. Alternatively, the faster the current value of the second current I2 changes, the faster the response speed of the first error amplifier 242, while the slower the current value of the second current I2 changes, the slower the response speed of the first error amplifier 242. This allows the response speed of the first error amplifier 242 to adapt to changes in the second current I2, thereby improving the adaptive capability of the circuit system and thereby increasing the response speed of the circuit while saving energy.

[0076] Please continue to see Figure 4 As shown, in one embodiment, the feedback regulation circuit 24 further includes a first current source 241. The input end of the first current source 241 is connected to the current output pin of the first error amplifier 242, and the output end of the first current source 241 is grounded. The first current source 241 can also provide the bias current required for the operation of the first error amplifier 242.

[0077] Please continue to see Figure 4 As shown, in one embodiment, the regulation compensation circuit 23 includes a first capacitor C1 and a buffer 231; the first end of the first capacitor C1 is connected to the output end of the first error amplifier 242, and the second end of the first capacitor C1 is grounded GND; the output end of the first error amplifier 242 is connected to the input end of the buffer 231, and the output end of the buffer 231 is connected to the control electrode of the first transistor Q1; the power supply end of the buffer 231 is used to receive the input voltage VIN, and the input voltage VIN is used to power the buffer 231.

[0078] The first capacitor C1 in this embodiment plays a role of circuit compensation, compensating the first adjustment signal VEA output by the first error amplifier 242 and pushing the pole of the first adjustment signal VEA to a higher frequency, which is beneficial to enhancing the stability of the system.

[0079] Please continue to see Figure 4 As shown, in one embodiment, the regulation compensation circuit 23 also includes a second current source 232, the input end of the second current source 232 is connected to the current output end on the buffer 231, the output end of the second current source 232 is grounded, and the second current source 232 provides the bias current required for the buffer 231 during operation.

[0080] Figure 5 For the fourth schematic diagram of the output voltage adaptive regulation circuit structure provided in the embodiment of the present application, please refer to Figure 5 As shown, in one embodiment of the present application, the linear power supply circuit includes a first transistor Q1, wherein a first electrode of the first transistor Q1 is used to receive an input voltage VIN, and a second electrode of the first transistor Q1 is a voltage output terminal, which is used to output a first output voltage VOUT1. The adaptive regulation circuit provided in this embodiment includes: a voltage sampling circuit 20, a current sampling circuit 21, a current mirror circuit 22, a feedback regulation circuit 24, and a regulation compensation circuit 23.

[0081] Continuing with Figure 5, the current sampling circuit 21 includes a current sampling module 211, a second transistor Q2, and a third transistor Q3. The first electrode of the second transistor Q2 is used to receive the input voltage VIN, the control electrode of the second transistor Q2 is connected to the control electrode of the first transistor Q1, and the second electrode of the second transistor Q2 is connected to the second electrode and the control electrode of the third transistor Q3, respectively. The sampling terminal of the current sampling module 211 is connected to the voltage output terminal, and the output terminal of the current sampling module 211 is also connected to the second electrode of the third transistor Q3. The first electrode of the third transistor Q3 is grounded GND. The second transistor Q2 is used to sample the fourth current flowing through the first transistor Q4, and the current sampling module 211 is used to sample the fifth current at the voltage output terminal. The third transistor Q3 is used to generate the first current I1 based on the fourth and fifth currents.

[0082] It is understandable that Figure 5 The second transistor Q2 and the first transistor Q1 form a current mirror structure, and in this embodiment, the size of the first transistor Q1 is larger than that of the second transistor Q2, so the current flowing through the second transistor Q2 is smaller than the current flowing through the first transistor Q1.

[0083] In this embodiment, the fourth current on the first transistor Q1 can be directly sampled through the second transistor Q2. This fourth current can reflect the fourth current during or before adjustment of the first transistor Q1. At the same time, the fifth current after adjustment can be directly sampled through the current sampling module 211. The fourth current and the fifth current are then combined through the third transistor Q3 to obtain the first current. It can be understood that the fourth current sampled through the second transistor Q2 can directly reflect the current change in the first transistor Q1, and the fifth current sampled through the current sampling module 211 can indirectly reflect the current condition in the first transistor Q1. These two current sampling methods can more quickly and accurately sample the change in the load current.

[0084] The second transistor Q2 in this embodiment may be a PMOS (P-Metal-Oxide-Semiconductor) transistor. When the second transistor Q2 is a PMOS transistor, its first electrode is a source electrode, its second electrode is a drain electrode, and its control electrode is a gate electrode. The third transistor Q3 in this embodiment may be an NMOS (N-Metal-Oxide-Semiconductor) transistor. When the third transistor Q3 is an NMOS transistor, its first electrode is a source electrode, its second electrode is a drain electrode, and its control electrode is a gate electrode.

[0085] Please continue to see Figure 5 As shown, the feedback regulation circuit 24 provided in this embodiment includes a first error amplifier 242; the negative input terminal of the first error amplifier 242 is connected to the output terminal of the voltage sampling circuit 20 to receive the feedback voltage Vfb sampled by the voltage sampling circuit 20; the positive input terminal of the first error amplifier 242 is used to receive the reference voltage Vref; the power supply terminal of the first error amplifier 242 is used to receive the input voltage VIN, and the compensation signal input terminal of the first error amplifier 242 is used to receive the second current I2; the first error amplifier 242 is used to compare the feedback voltage Vfb and the reference voltage Vref under the triggering of the second current I2 to obtain a voltage error signal, and amplify the voltage error signal to obtain a first regulation signal VEA.

[0086] The power supply terminal of the first error amplifier 242 is configured to receive an input voltage VIN, which is used to power the first error amplifier 242. Meanwhile, the compensation signal input terminal of the first error amplifier 242 is configured to receive a second current I2, which is equivalent to a control current and provides a bias current required for the operation of the first error amplifier 242. The larger the value of the second current I2, the faster the response speed of the first error amplifier 242, while the smaller the value of the second current I2, the slower the response speed of the first error amplifier 242. Alternatively, the faster the current value of the second current I2 changes, the faster the response speed of the first error amplifier 242, while the slower the current value of the second current I2 changes, the slower the response speed of the first error amplifier 242. This allows the response speed of the first error amplifier 242 to adapt to changes in the second current I2, thereby improving the adaptive capability of the circuit system and thereby increasing the response speed of the circuit while saving energy.

[0087] Please continue to see Figure 5As shown, in one embodiment, the feedback regulation circuit 24 further includes a first current source 241. The input end of the first current source 241 is connected to the current output pin of the first error amplifier 242, and the output end of the first current source 241 is grounded. The first current source 241 can also provide the bias current required for the operation of the first error amplifier 242.

[0088] Please continue to see Figure 4 As shown, in one embodiment, the regulation compensation circuit 23 includes a first capacitor C1 and a buffer 231; the first end of the first capacitor C1 is connected to the output end of the first error amplifier 242, and the second end of the first capacitor C1 is grounded GND; the output end of the first error amplifier 242 is connected to the input end of the buffer 231, and the output end of the buffer 231 is connected to the control electrode of the first transistor Q1; the power supply end of the buffer 231 is used to receive the input voltage VIN, and the input voltage VIN is used to power the buffer 231.

[0089] The first capacitor C1 in this embodiment plays a role of circuit compensation, compensating the first adjustment signal VEA output by the first error amplifier 242 and pushing the pole of the first adjustment signal VEA to a higher frequency, which is beneficial to enhancing the stability of the system.

[0090] Please continue to see Figure 5 As shown, in one embodiment, the regulation compensation circuit 23 also includes a second current source 232, the input end of the second current source 232 is connected to the current output end on the buffer 231, the output end of the second current source 232 is grounded, and the second current source 232 provides the bias current required for the buffer 231 during operation.

[0091] In one embodiment, the current mirror circuit 22 is further used to obtain a third current I3 based on the first current I1; the adjustment compensation circuit 23 also includes a second capacitor C2, a first end of the second capacitor C2 is connected to the output end of the first error amplifier 242, and a second end of the second capacitor C2 is used to receive the third current I3, the third current I3 is proportional to the second capacitor C2, and the third current I3 and the second capacitor C2 have the same variation characteristics.

[0092] Generally, the transistor used to generate the third current I3 can be equivalent to a variable resistor, whose resistance changes with the third current I3, and the resistance of the variable resistor is positively correlated with the current value of the third current I3. That is, when the current value of the third current I3 increases, the resistance of the variable resistor equivalent to the transistor also increases. In this way, the variable resistor and the second capacitor C2 can form a compensation unit that changes with the load current. Under different load currents, the compensation unit can have different output characteristics to automatically adjust the stability of the circuit system. At the same time, the buffer 231 can improve the driving capability, push the pole in the circuit system to a higher frequency, and also help enhance the stability of the system.

[0093] Figure 6 For the fifth schematic diagram of the output voltage adaptive regulation circuit structure provided in the embodiment of the present application, please refer to Figure 6 As shown, in one embodiment of the present application, the linear power supply circuit includes a first transistor Q1, wherein a first electrode of the first transistor Q1 is used to receive an input voltage VIN, and a second electrode of the first transistor Q1 is a voltage output terminal, which is used to output a first output voltage VOUT1. The adaptive regulation circuit provided in this embodiment includes: a voltage sampling circuit 20, a current sampling circuit 21, a current mirror circuit 22, a feedback regulation circuit 24, and a regulation compensation circuit 23.

[0094] Continuing with Figure 6, the current sampling circuit 21 includes a current sampling module 211, a second transistor Q2, and a third transistor Q3. The first electrode of the second transistor Q2 is used to receive the input voltage VIN, the control electrode of the second transistor Q2 is connected to the control electrode of the first transistor Q1, and the second electrode of the second transistor Q2 is connected to the second electrode and the control electrode of the third transistor Q3, respectively. The sampling terminal of the current sampling module 211 is connected to the voltage output terminal, and the output terminal of the current sampling module 211 is also connected to the second electrode of the third transistor Q3. The first electrode of the third transistor Q3 is grounded GND. The second transistor Q2 is used to sample the fourth current flowing through the first transistor Q4, and the current sampling module 211 is used to sample the fifth current at the voltage output terminal. The third transistor Q3 is used to generate the first current I1 based on the fourth and fifth currents.

[0095] It is understandable that Figure 6 The second transistor Q2 and the first transistor Q1 form a current mirror structure, and in this embodiment, the size of the first transistor Q1 is larger than that of the second transistor Q2, so the current flowing through the second transistor Q2 is smaller than the current flowing through the first transistor Q1.

[0096] In this embodiment, the fourth current on the first transistor Q1 can be directly sampled through the second transistor Q2. This fourth current can reflect the fourth current during or before adjustment of the first transistor Q1. At the same time, the fifth current after adjustment can be directly sampled through the current sampling module 211. The fourth current and the fifth current are then combined through the third transistor Q3 to obtain the first current. It can be understood that the fourth current sampled through the second transistor Q2 can directly reflect the current change in the first transistor Q1, and the fifth current sampled through the current sampling module 211 can indirectly reflect the current condition in the first transistor Q1. These two current sampling methods can more quickly and accurately sample the change in the load current.

[0097] The second transistor Q2 in this embodiment may be a PMOS (P-Metal-Oxide-Semiconductor) transistor. When the second transistor Q2 is a PMOS transistor, its first electrode is a source electrode, its second electrode is a drain electrode, and its control electrode is a gate electrode. The third transistor Q3 in this embodiment may be an NMOS (N-Metal-Oxide-Semiconductor) transistor. When the third transistor Q3 is an NMOS transistor, its first electrode is a source electrode, its second electrode is a drain electrode, and its control electrode is a gate electrode.

[0098] Please continue to see Figure 6 As shown, the feedback regulation circuit 24 provided in this embodiment includes a first error amplifier 242; the negative input terminal of the first error amplifier 242 is connected to the output terminal of the voltage sampling circuit 20 to receive the feedback voltage Vfb sampled by the voltage sampling circuit 20; the positive input terminal of the first error amplifier 242 is used to receive the reference voltage Vref; the power supply terminal of the first error amplifier 242 is used to receive the input voltage VIN, and the compensation signal input terminal of the first error amplifier 242 is used to receive the second current I2; the first error amplifier 242 is used to compare the feedback voltage Vfb and the reference voltage Vref under the triggering of the second current I2 to obtain a voltage error signal, and amplify the voltage error signal to obtain a first regulation signal VEA.

[0099] The power supply terminal of the first error amplifier 242 is configured to receive an input voltage VIN, which is used to power the first error amplifier 242. Meanwhile, the compensation signal input terminal of the first error amplifier 242 is configured to receive a second current I2, which is equivalent to a control current and provides a bias current required for the operation of the first error amplifier 242. The larger the value of the second current I2, the faster the response speed of the first error amplifier 242, while the smaller the value of the second current I2, the slower the response speed of the first error amplifier 242. Alternatively, the faster the current value of the second current I2 changes, the faster the response speed of the first error amplifier 242, while the slower the current value of the second current I2 changes, the slower the response speed of the first error amplifier 242. This allows the response speed of the first error amplifier 242 to adapt to changes in the second current I2, thereby improving the adaptive capability of the circuit system and thereby increasing the response speed of the circuit while saving energy.

[0100] Please continue to see Figure 6 As shown, in one embodiment, the feedback regulation circuit 24 further includes a first current source 241. The input end of the first current source 241 is connected to the current output pin of the first error amplifier 242, and the output end of the first current source 241 is grounded. The first current source 241 can also provide the bias current required for the operation of the first error amplifier 242.

[0101] Please continue to see Figure 6 As shown, in one embodiment, the regulation and compensation circuit 23 includes a first capacitor C1 and a buffer 231; the first end of the first capacitor C1 is connected to the output end of the first error amplifier 242, and the second end of the first capacitor C1 is grounded GND; the output end of the first error amplifier 242 is connected to the input end of the buffer 231, and the output end of the buffer 231 is connected to the control electrode of the first transistor Q1; the power supply end of the buffer 231 is used to receive the input voltage VIN, and the input voltage VIN is used to power the buffer 231. Among them, the first capacitor C1 in this embodiment plays the role of circuit compensation, compensating the first regulation signal VEA output by the first error amplifier 242, pushing the pole of the first regulation signal VEA to a higher frequency, which is conducive to enhancing the stability of the system. Please continue to refer to Figure 6 As shown, in one embodiment, the regulation compensation circuit 23 also includes a second current source 232, the input end of the second current source 232 is connected to the current output end on the buffer 231, the output end of the second current source 232 is grounded, and the second current source 232 provides the bias current required for the buffer 231 during operation.

[0102] Please continue to see Figure 6As shown, in one embodiment, the adjustment and compensation circuit 23 further includes a third capacitor C3 and a first resistor R1; a first end of the first resistor R1 is connected to the output end of the first error amplifier 242, a second end of the first resistor R1 is connected to the first end of the third capacitor C3, and a second end of the third capacitor C3 is grounded GND. Thus, the third capacitor C3 and the first resistor R1 form a stable compensation unit that can adjust the stability of the circuit system.

[0103] In one embodiment, the current mirror circuit 22 is further configured to obtain a fourth current I4 based on the first current I1; the bias current terminal of the buffer 231 is configured to receive the fourth current I4, which can provide the buffer 231 with the bias current required for operation.

[0104] It is understood that the fourth current I4 and the first current I1 have the same variation characteristics, and the magnitude of the fourth current I4 is positively correlated with the magnitude of the first current I1. Specifically, the larger the value of the fourth current I4, the faster the response speed of the buffer 231, while the smaller the value of the second current I2, the slower the response speed of the buffer 231. Alternatively, the faster the value of the second current I2 changes, the faster the response speed of the buffer 231, while the slower the value of the second current I2 changes, the slower the response speed of the buffer 231. This allows the response speed of the buffer 231 to adaptively follow the changes of the second current I2, improving the adaptive capability of the circuit system, thereby saving energy while increasing the circuit's response speed.

[0105] Please continue to see Figure 5 or Figure 6 As shown, the current mirror circuit 22 in this embodiment includes a fourth transistor Q4, a fifth transistor Q5, and a sixth transistor Q6. The control electrode of the fourth transistor Q4 is connected to the control electrode of the third transistor Q4, the first electrode of the fourth transistor Q4 is grounded GND, and the second electrode of the fourth transistor Q4 is connected to the compensation signal input terminal of the first error amplifier 242. The fourth transistor Q4 is configured to mirror the first current I1 to generate the second current I2. The fourth transistor Q4 and the third transistor Q3, through the mirroring relationship, can provide an adaptively variable bias current for the first error amplifier 242.

[0106] The control electrode of the fifth transistor Q5 is connected to the control electrode of the third transistor Q3, the first electrode of the fifth transistor Q5 is grounded to GND, and the second electrode of the fifth transistor Q5 is connected to the second end of the second capacitor C2. The fifth transistor Q5 is used to mirror the first current I1 to obtain the third current I3. The fifth transistor Q5 can be equivalent to a variable resistor. In this way, the variable resistor and the second capacitor C2 can form a compensation unit that changes with the load current. Under different load currents, the compensation unit can have different output characteristics to automatically adjust the stability of the circuit system. At the same time, the buffer 231 can improve the driving capability, push the pole in the circuit system to a higher frequency, and also help enhance the stability of the system.

[0107] Among them, the control electrode of the sixth transistor Q6 is connected to the control electrode of the third transistor Q3, the first electrode of the sixth transistor Q6 is grounded GND, and the second electrode of the sixth transistor Q6 is connected to the second end of the second capacitor C2; the sixth transistor Q6 is used to mirror the first current I1 to obtain the fourth current I4.

[0108] The fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6 in this embodiment can all be NMOS (N-Metal-Oxide-Semiconductor) transistors. When the fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6 are NMOS transistors, their first electrodes are sources, their second electrodes are drains, and their control electrodes are gates.

[0109] See Figure 6 As shown, the linear power supply circuit provided in this embodiment further includes an output capacitor COUT, a first end of which is connected to the voltage output end, and a second end of which is grounded GND; the output capacitor COUT can stabilize and filter the load RCOT on the voltage output end, thereby improving the stability of the circuit operation.

[0110] It can be seen that according to the output voltage adaptive regulation circuit provided by this embodiment, when the load at the voltage output end changes, the current sampling circuit 21 can accurately sample the magnitude of the load current and current change information. Then, after the sampled first current I1 is mirrored by the current mirror circuit 22, bias current is provided to the feedback regulation circuit 24 and the regulation compensation circuit 23. In this way, when the load current at the voltage output end of the linear power supply circuit decreases, the second current will also decrease accordingly, and the power consumed by the feedback regulation circuit 24 will be smaller, thereby saving the overall power consumption of the circuit. When the load current at the voltage output end of the linear power supply circuit increases, the second current will also increase accordingly, thereby improving the response speed of the feedback regulation circuit 24.

[0111] Furthermore, according to the output voltage adaptive regulation circuit provided in this embodiment, when the magnitude of the load current on the voltage output end of the linear power supply circuit changes too quickly, the second current I2, the third current I3, and the fourth current I4 will also change quickly. This will also quickly regulate the current on the feedback regulation circuit 24, thereby improving the response speed of the feedback regulation circuit 24. That is, the feedback regulation circuit 24 can quickly output the first regulation signal, thereby improving the feedback regulation efficiency of the circuit.

[0112] An embodiment of the present application further provides a linear power supply circuit, which includes a main control module 31 and an output voltage adaptive regulation circuit as provided in the above embodiments. The main control module 31 is used to receive an input voltage and regulate the input voltage to output a first output voltage VOUT1.

[0113] The present application also provides a linear power supply circuit, comprising a main control module 31, which includes a first transistor Q1. Specifically, the linear power supply circuit includes the first transistor Q1 and the output voltage adaptive regulation circuit provided in the aforementioned embodiments. The first electrode of the first transistor Q1 is configured to receive an input voltage VIN, and the second electrode of the first transistor Q2 serves as a voltage output terminal for outputting a first output voltage VOUT1. The circuit structure and operating principle of the output voltage adaptive regulation circuit in this embodiment can be found in the aforementioned embodiments and will not be further elaborated here.

[0114] An embodiment of the present application also provides a chip, which includes an output voltage adaptive regulation circuit as provided in the above embodiments; wherein, the circuit structure and working principle of the output voltage adaptive regulation circuit in this embodiment can be referred to the above embodiments and will not be repeated here.

[0115] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An output voltage adaptive regulation circuit for use in a linear power supply circuit, the linear power supply circuit comprising a main control module, the main control module being configured to receive an input voltage and regulate the input voltage to output a first output voltage; characterized in that: The adaptive regulation circuit includes: a voltage sampling circuit, a current sampling circuit, a current mirror circuit, a feedback regulation circuit and a regulation compensation circuit; The voltage sampling circuit is connected to the voltage output terminal and the feedback regulation circuit respectively, the current sampling circuit is connected to the voltage output terminal and the current mirror circuit respectively, the current mirror circuit is connected to the feedback regulation circuit and the regulation compensation circuit respectively, and the regulation compensation circuit is connected to the feedback regulation circuit and the main control module respectively; The voltage sampling circuit is used to sample the feedback voltage of the voltage output terminal, and the feedback voltage is used to represent the magnitude and voltage change information of the first output voltage; The current sampling circuit is used to sample the magnitude and current change information of the load current at the voltage output end to obtain a first current; The current mirror circuit is configured to obtain a second current according to the first current, and output the second current to the feedback regulation circuit; The feedback regulation circuit is configured to receive a reference voltage and the feedback voltage, and obtain a first regulation signal according to the reference voltage and the feedback voltage when triggered by the second current; The regulation and compensation circuit is used to perform signal compensation on the first regulation signal to obtain a second regulation signal, and output the second regulation signal to the control terminal of the main control module; The main control module is configured to adjust the first output voltage according to the second adjustment signal.

2. The output voltage adaptive regulation circuit according to claim 1, characterized in that: The main control module includes a first transistor, wherein a first electrode of the first transistor is used to receive an input voltage, and a second electrode of the first transistor is a voltage output terminal, used to output a first output voltage; the regulation and compensation circuit is connected to the feedback regulation circuit and the control electrode of the first transistor respectively; The regulation and compensation circuit is configured to output the second regulation signal to the control electrode of the first transistor; The first transistor is configured to adjust the first output voltage according to the second adjustment signal.

3. The output voltage adaptive regulation circuit according to claim 2, characterized in that: The current sampling circuit includes a current sampling module, a second transistor and a third transistor; The first electrode of the second transistor is used to receive the input voltage, the control electrode of the second transistor is connected to the control electrode of the first transistor, and the second electrode of the second transistor is respectively connected to the second electrode and the control electrode of the third transistor; the sampling end of the current sampling module is connected to the voltage output end, the output end of the current sampling module is also connected to the second electrode of the third transistor, and the first electrode of the third transistor is grounded; The second transistor is used to sample a fourth current flowing through the first transistor, and the current sampling module is used to sample a fifth current on the voltage output terminal; the third transistor is used to generate the first current according to the fourth current and the fifth current.

4. The output voltage adaptive regulation circuit according to claim 3, characterized in that: The feedback regulation circuit includes a first error amplifier; The negative input terminal of the first error amplifier is connected to the output terminal of the voltage sampling circuit to receive the feedback voltage sampled by the voltage sampling circuit; the positive input terminal of the first error amplifier is used to receive the reference voltage; The power supply terminal of the first error amplifier is used to receive the input voltage, and the compensation signal input terminal of the first error amplifier is used to receive the second current; The first error amplifier is used to compare the feedback voltage with the reference voltage under the triggering of the second current to obtain a voltage error signal, and amplify the voltage error signal to obtain the first adjustment signal.

5. The output voltage adaptive regulation circuit according to claim 4, characterized in that: The regulating and compensating circuit includes a first capacitor and a buffer; The first end of the first capacitor is connected to the output end of the first error amplifier, and the second end of the first capacitor is grounded; the output end of the first error amplifier is connected to the input end of the buffer, and the output end of the buffer is connected to the control electrode of the first transistor; the power supply end of the buffer is used to receive the input voltage.

6. The output voltage adaptive regulation circuit according to claim 5, characterized in that: The current mirror circuit is further configured to obtain a third current based on the first current; The regulation and compensation circuit further includes a second capacitor, a first end of the second capacitor is connected to the output end of the first error amplifier, and a second end of the second capacitor is used to receive the third current.

7. The output voltage adaptive regulation circuit according to claim 5 or 6, characterized in that: The regulating and compensating circuit further includes a third capacitor and a first resistor; A first end of the first resistor is connected to the output end of the first error amplifier, a second end of the first resistor is connected to the first end of the third capacitor, and a second end of the third capacitor is grounded.

8. The output voltage adaptive regulation circuit according to claim 6, characterized in that: The current mirror circuit is further configured to obtain a fourth current based on the first current; and the bias current terminal of the buffer is configured to receive the fourth current.

9. The output voltage adaptive regulation circuit according to claim 8, characterized in that: The current mirror circuit includes a fourth transistor, a fifth transistor and a sixth transistor; a control electrode of the fourth transistor connected to the control electrode of the third transistor, a first electrode of the fourth transistor grounded, and a second electrode of the fourth transistor connected to the compensation signal input terminal of the first error amplifier; the fourth transistor is configured to mirror the first current to obtain the second current; a control electrode of the fifth transistor connected to the control electrode of the third transistor, a first electrode of the fifth transistor being grounded, and a second electrode of the fifth transistor being connected to the second end of the second capacitor; the fifth transistor being configured to mirror the first current to obtain the third current; The control electrode of the sixth transistor is connected to the control electrode of the third transistor, the first electrode of the sixth transistor is grounded, and the second electrode of the sixth transistor is connected to the second end of the second capacitor; the sixth transistor is used to mirror the first current to obtain the fourth current.

10. A linear power supply circuit, characterized in that: The linear power supply circuit comprises a main control module and an output voltage adaptive regulation circuit according to any one of claims 1 to 9, wherein the main control module is configured to receive an input voltage and perform voltage regulation on the input voltage to output a first output voltage; The output voltage adaptive regulation circuit is connected to the voltage output terminal and the control electrode of the first transistor respectively.

11. A chip, characterized in that: The chip includes the output voltage adaptive regulation circuit according to any one of claims 1 to 9.

Images