CN115756080A

CN115756080A - Reference voltage generation circuit, control method, chip and electronic equipment

Info

Publication number: CN115756080A
Application number: CN202211572470.6A
Authority: CN
Inventors: 周经纬
Original assignee: Hefei Chipsea Electronics Technology Co Ltd
Current assignee: Hefei Chipsea Electronics Technology Co Ltd
Priority date: 2022-12-08
Filing date: 2022-12-08
Publication date: 2023-03-07

Abstract

The application provides a reference voltage generation circuit, a control method, a chip and electronic equipment, and belongs to the technical field of electronics. The reference voltage generating circuit comprises a reference current generating module, a first reference voltage generating module and a second reference voltage generating module; the reference current generation module is used for generating a reference current based on an input voltage; the first reference voltage generation module is used for generating at least one first current based on the reference current and outputting a corresponding first reference voltage based on the first current; the second reference voltage generation module is configured to generate at least one second current based on the reference current when the reference voltage required by the subsequent stage circuit includes a second reference voltage, and output a corresponding second reference voltage based on the second current, wherein the second reference voltage is greater than the first reference voltage. By the adoption of the method and the device, the extra power consumption can be reduced while various reference voltages are supported to be output.

Description

Reference voltage generation circuit, control method, chip and electronic equipment

Technical Field

The present application relates to the field of electronic technologies, and in particular, to a reference voltage generating circuit, a control method, a chip, and an electronic device.

Background

The bandgap reference circuit is an important component of an analog integrated circuit, is used for generating current or voltage independent of power supply voltage and temperature, and has wide application in many fields.

A band-gap reference module is arranged in a common chip and provides reference voltage for other modules. In some application scenarios, a chip requires a plurality of different reference voltages, but the bandgap reference module generally generates only one reference voltage.

Therefore, a reference voltage generating circuit capable of outputting a plurality of reference voltages is needed.

Disclosure of Invention

In order to solve the problems in the prior art, embodiments of the present application provide a reference voltage generation circuit, a control method, a chip, and an electronic device, which can reduce extra power consumption while supporting output of multiple reference voltages. The technical scheme is as follows:

according to an aspect of the present application, there is provided a reference voltage generation circuit including a reference current generation module, a first reference voltage generation module, and a second reference voltage generation module;

the reference current generation module is used for generating a reference current based on an input voltage;

the first reference voltage generation module is used for generating at least one first current based on the reference current and outputting a corresponding first reference voltage based on the first current;

the second reference voltage generation module is configured to generate at least one second current based on the reference current and output a corresponding second reference voltage based on the second current when the reference voltage required by the subsequent stage circuit includes a second reference voltage, wherein the second reference voltage is greater than the first reference voltage.

According to another aspect of the present application, there is provided a control method of a reference voltage generating circuit including a reference current generating module, a first reference voltage generating module, and a second reference voltage generating module, the method including:

generating, by the reference current generation module, a reference current based on an input voltage;

generating, by the first reference voltage generation module, at least one first current based on the reference current and outputting a corresponding first reference voltage based on the first current;

when the reference voltage required by the rear-stage circuit comprises a second reference voltage, generating at least one second current based on the reference current through the second reference voltage generation module, and outputting a corresponding second reference voltage based on the second current, wherein the second reference voltage is greater than the first reference voltage.

According to another aspect of the present application, there is provided a chip including the above-described reference voltage generation circuit.

According to another aspect of the present application, there is provided an electronic apparatus including the above-described reference voltage generation circuit.

In the application, the reference voltage generation circuit comprises a reference current generation module, a first reference voltage generation module and a second reference voltage generation module, and different reference voltages can be output through the first reference voltage generation module and the second reference voltage generation module.

Meanwhile, the second reference voltage generation module may output a corresponding second reference voltage when the reference voltage required by the subsequent stage circuit includes the second reference voltage, and the second reference voltage is greater than the first reference voltage output by the first reference voltage generation module. That is to say, in an application scenario where the power consumption of the reference voltage generation circuit is large, the second reference voltage generation module may be selectively enabled, so that the reference voltage generation circuit may reduce the extra power consumption while supporting the output of multiple reference voltages.

Drawings

Further details, features and advantages of the present application are disclosed in the following description of exemplary embodiments, which is to be read in connection with the accompanying drawings, in which:

FIG. 1 illustrates a schematic diagram of a reference voltage generation circuit provided in accordance with an exemplary embodiment of the present application;

FIG. 2 illustrates a schematic diagram of a first reference voltage generation module provided in accordance with an exemplary embodiment of the present application;

FIG. 3 illustrates a schematic diagram of a resistance module provided in accordance with an exemplary embodiment of the present application;

FIG. 4 illustrates a resistor module schematic provided in accordance with an exemplary embodiment of the present application;

FIG. 5 illustrates a schematic diagram of a first reference voltage generation module provided in accordance with an exemplary embodiment of the present application;

FIG. 6 illustrates a schematic diagram of a first reference voltage generation module provided in accordance with an exemplary embodiment of the present application;

FIG. 7 illustrates a second reference voltage generation module provided in accordance with an exemplary embodiment of the present application;

FIG. 8 illustrates a schematic diagram of a reference current generation module provided in accordance with an exemplary embodiment of the present application;

FIG. 9 illustrates a schematic diagram of a fast charge circuit provided in accordance with an exemplary embodiment of the present application;

FIG. 10 shows a schematic diagram of a transmitting module and a receiving module provided in accordance with an example embodiment of the present application;

FIG. 11 shows a schematic diagram of a transmitting module and a receiving module provided in accordance with an example embodiment of the present application;

FIG. 12 illustrates a first detection circuit schematic provided in accordance with an exemplary embodiment of the present application;

FIG. 13 illustrates a first detection circuit schematic provided in accordance with an exemplary embodiment of the present application;

FIG. 14 illustrates a second detection circuit schematic provided in accordance with an exemplary embodiment of the present application;

FIG. 15 illustrates a second detection circuit schematic provided in accordance with an exemplary embodiment of the present application;

fig. 16 is a flowchart illustrating a control method of the reference voltage generation circuit according to an exemplary embodiment of the present application.

In the figure, 1, a reference current generating module; 11. an operational amplification unit; 12. a third resistance module; 13. a reference current branch; 2. a first reference voltage generation module; 21. a first current generation module; 22. a first resistance module; 23. a first switch module; 3. a second reference voltage generation module; 31. a second current generation module; 32. a second resistance module; 33. a second switch module; 4. a sending module; 5. a receiving module; 6. a first detection circuit; 7. a second detection circuit.

Detailed Description

Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are for illustration purposes only and are not intended to limit the scope of the present application.

The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description. It should be noted that the terms "first", "second", and the like in the present application are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.

It is noted that references to "a" or "an" modification in this application are intended to be illustrative rather than limiting, and those skilled in the art will appreciate that references to "one or more" are intended to be exemplary unless the context clearly indicates otherwise.

The names of messages or information exchanged between a plurality of devices in the embodiments of the present application are for illustrative purposes only, and are not intended to limit the scope of the messages or information.

The embodiment of the application provides a reference voltage generation circuit, which can be integrated in a chip or arranged in an electronic device.

Referring to a schematic diagram of a reference voltage generating circuit shown in fig. 1, the reference voltage generating circuit may include a reference current generating module 1, a first reference voltage generating module 2, and a second reference voltage generating module 3, where the reference current generating module 1, the first reference voltage generating module 2, and the second reference voltage generating module 3 are connected in parallel.

A reference current generating module 1, operable to generate a reference current based on an input voltage;

the first reference voltage generating module 2 may be configured to generate at least one first current based on the reference current, and output a corresponding first reference voltage based on the first current;

the second reference voltage generating module 3 may be configured to generate at least one second current based on the reference current when the reference voltage required by the subsequent stage circuit includes the second reference voltage, and output a corresponding second reference voltage based on the second current.

The second reference voltage is greater than the first reference voltage.

In a possible implementation manner, the reference current generating module 1 may receive an input voltage provided by an external circuit, for example, the input voltage may refer to a bandgap reference voltage generated by a bandgap reference circuit, or may also be a power supply voltage or a voltage output by an LDO (Low Dropout Regulator) module, and the specific input voltage is not limited in this embodiment. And in the reference current generation block 1, the reference voltage is converted into a reference current having a fixed current value, which flows through the reference current generation block 1.

Thus, the first reference voltage generation module 2 may generate the first current flowing through the first reference voltage generation module 2 with the reference current as a reference. In addition, the first reference voltage generating module 2 may include one or more parallel first reference voltage generating branches, and in this embodiment, the current flowing through each first reference voltage generating branch is referred to as a first current, so that at least one first current may be generated in the first reference voltage generating module 2. In each first reference voltage generation branch, the first current is converted into a corresponding first reference voltage. Optionally, in the enabled state of the reference voltage generating circuit, the first reference voltage generating module 2 may be turned on normally, that is, the first reference voltage is continuously provided to the subsequent circuit.

Similarly, the second reference voltage generation module 3 may generate the second current flowing through the second reference voltage generation module 3 with the reference current as a reference. In addition, the second reference voltage generating module 3 may include one or more parallel second reference voltage generating branches, and in this embodiment, the current flowing through each second reference voltage generating branch is referred to as a second current, so that at least one second current may be generated in the second reference voltage generating module 3. In each second reference voltage generation branch, the second current is converted into a corresponding second reference voltage.

The second reference voltage generation module 3 is different from the first reference voltage generation module 2 in that the generated second reference voltage is greater than the first reference voltage, and when the reference voltage required by the subsequent stage circuit of the reference voltage generation circuit includes the second reference voltage, the corresponding second reference voltage may be output. The second reference voltage generation module 3 may not output the reference voltage required by the subsequent stage circuit of the reference voltage generation circuit if the reference voltage does not include the second reference voltage.

Generally, the minimum voltage required for generating the first reference voltage is small, and the minimum voltage required for generating the second reference voltage is large, so that in order to ensure the normal function of the second reference voltage generating module 3, the power supply voltage connected to the reference voltage generating circuit is also large, and the second current is also large, so that the power consumption of the reference voltage generating circuit is also correspondingly increased. Therefore, by selectively enabling the second reference voltage generation module, the reference voltage generation circuit can reduce additional power consumption while supporting output of a variety of reference voltages.

Optionally, referring to the schematic diagram of the first reference voltage generation module shown in fig. 2, the first reference voltage generation module 2 may include at least one first reference voltage generation branch, and the first reference voltage generation branch includes a first current generation module 21 and a first resistance module 22. In any of the first reference voltage generating branches, the first current generating module 21 and the first resistance module 22 are connected in series.

A first current generation module 21 operable to generate a first current based on a reference current;

the first resistance module 22 may be configured to generate a corresponding first reference voltage based on the first current and a resistance unit through which the first current flows in the first resistance module 22.

The specific voltage value of the first reference voltage may be obtained by a current value of the first current and a resistance value of the resistance unit flowing through the first current, and the current value of the first current and the resistance value of the resistance unit flowing through the first current may be preset, which is not limited in this embodiment.

In a possible embodiment, in the first reference voltage generation branch, a first current generation module 21 may be employed, and the reference current is used as a reference to generate a first current, and the first current flows into the first resistance module 22, so as to generate a corresponding first reference voltage based on a voltage division principle of resistance.

Optionally, the first resistance module 22 may have two cases, the first case is that the first resistance module 22 includes a plurality of first resistance units, the first current flows through the plurality of first resistance units, and different first reference voltages are generated at the end points of different first resistance units; the second case is that the first resistor module 22 includes a second resistor unit with an adjustable resistance value, and is configured to output the current first reference voltage generated by the current resistance value through an output port of the second resistor unit.

As an example, referring to the resistor module diagram shown in fig. 3, the first resistor module 22 may include a plurality of first resistor units R1 to Rn connected in series, and a first current may flow through each of the first resistor units, so that one end of each of the first resistor units, which is far away from the ground end, may have different voltages, which are respectively used as different first reference voltages 1 to n.

As another example, referring to the schematic diagram of the resistor module shown in fig. 4, the first resistor module 22 includes a second resistor unit with adjustable resistance, and a voltage at a terminal of the first resistor module 22 away from the ground terminal may be used as the first reference voltage. The resistance-adjustable second resistance unit may include a plurality of resistors R1 to Rm connected in series, each resistor being connected in parallel with a switch. If the

switches

1 and 2 are closed, the

resistors

1 and 2 are short-circuited, and the first current flows through the resistors R3 to Rm, the first reference voltage is obtained from the current value of the first current and the resistance values of the resistors R3 to Rm. Therefore, by adjusting the resistance value of the second resistance unit, different first reference voltages can be obtained.

Optionally, in the first case of the first resistance module 22, the first reference voltage generating branch may further include a first selection circuit, and the first selection circuit may be configured to select the first reference voltage generated by the terminal of the one or more first resistance units.

Optionally, the first reference voltage generating branch 2 may further include a first switching module 23, where the first switching module 23 is configured to turn on the first reference voltage generating branch when the reference voltage required by the post-stage circuit of the reference voltage generating circuit includes the first reference voltage corresponding to the first reference voltage generating branch.

In one possible embodiment, the reference voltage required by the circuit at the later stage of the reference voltage generation circuit may include a plurality of types, for example, a plurality of stages of reference voltages are required, and the control circuit external to the reference voltage generation circuit may determine the currently required reference voltage and transmit a corresponding reference voltage selection signal to the reference voltage generation circuit. If the first reference voltage generating branch 2 for generating the reference voltage includes the first switching module 23, the first switching module 23 may be controlled to be turned on based on the reference voltage selection signal, so as to turn on the first reference voltage generating branch, and generate the reference voltage, so as to provide the reference voltage to the post-stage circuit.

On this basis, the first reference voltage generation module 2 may have two cases, the first case is that all the first reference voltage generation branches include the first switch module 23 (as shown in fig. 5), and the second case is that part of the first reference voltage generation branches 2 include the first switch module 23 (as shown in fig. 6). In a second case, the first reference voltage generating branch not including the first switch module 23 may be normally turned on, and the first reference voltage generating branch including the first switch module 23 may be selectively turned on.

Optionally, the first current generation module 21 may include a first mirror branch, and the first mirror branch and the reference current branch included in the reference current generation module form a mirror relationship. The first mirror branch is used for copying the reference current flowing through the reference current branch according to a first proportion, so that a first current is generated.

In a possible implementation, the reference current generation module 1 may include a reference current branch, and the reference current branch and the first mirror branch may form a current mirror circuit. When the reference current flows through the reference current branch in the reference current generation module 1, the first mirror branch may copy the reference current according to a first proportion according to a current mirror principle, so as to generate a first current. The first ratio may be determined by a size ratio of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) between the first mirror branch and the reference current branch, and the specific first ratio is not limited in this embodiment.

Optionally, referring to the schematic diagram of the second reference voltage generating module shown in fig. 7, the second reference voltage generating module 3 may include at least one second reference voltage generating branch, and the second reference voltage generating branch includes a second current generating module 31, a second resistance module 32, and a second switching module 33. In any of the second reference voltage generating branches, the second current generating module 31 and the second resistance module 32 are connected in series.

The second switching module 33 may be configured to turn on the second reference voltage generating branch when the reference voltage required by the subsequent stage circuit includes a second reference voltage corresponding to the second reference voltage generating branch;

the second current generation module 31 may be configured to generate a second current based on the reference current when the second reference voltage generation branch is turned on;

the second resistance module 32 may be configured to generate a corresponding second reference voltage based on the second current and a resistance unit through which the second current flows in the second resistance module 32.

The specific voltage value of the second reference voltage may be obtained by a current value of the second current and a resistance value of the resistance unit flowing through the second current, and the current value of the second current and the resistance value of the resistance unit flowing through the second current may be preset, which is not limited in this embodiment.

In one possible embodiment, if the reference voltage required by the subsequent stage circuit of the reference voltage generation circuit includes the second reference voltage, the control circuit external to the reference voltage generation circuit may transmit the corresponding reference voltage selection signal to the reference voltage generation circuit. In the reference voltage generating circuit, the second switch module 33 may be controlled to be turned on based on the reference voltage selection signal, so as to turn on the corresponding second reference voltage generating branch.

In the second reference voltage generation branch, a second current generation module 31 may be adopted, and a second current may be generated by using the reference current as a reference, and the second current flows into a second resistance module 32, so that a corresponding second reference voltage may be generated based on a voltage division principle of resistance, so as to provide the reference voltage for a subsequent circuit.

Optionally, the second resistor module 32 may have two cases, where the first case refers to that the second resistor module 32 includes a plurality of third resistor units, the second current flows through the plurality of third resistor units, and different second reference voltages are generated at end points of different third resistor units; in the second case, the second resistor module 32 includes a fourth resistor unit with an adjustable resistance value, and is configured to output the current second reference voltage generated by the current resistance value through an output port of the fourth resistor unit.

The structure and the implementation principle of the second resistor module 32 are similar to those of the first resistor module 22, and are not described herein again.

Optionally, in the first case of the second resistance module 32, the second reference voltage generating branch may further include a second selection circuit, and the second selection circuit may be configured to select the second reference voltage generated by the terminal of the one or more third resistance units.

Optionally, the second current generation module 31 may include a second mirror branch, and the second mirror branch and the reference current branch included in the reference current generation module form a mirror relationship. The second mirror branch is used for copying the reference current flowing through the reference current branch according to a second proportion so as to generate a second current.

In a possible implementation manner, the reference current generation module 1 may include a reference current branch using a current mirror principle, and the reference current branch and the second mirror branch may form a current mirror circuit. When the reference current flows through the reference current branch in the reference current generation module 1, according to the current mirror principle, the second mirror branch may copy the reference current according to a second ratio, thereby generating a second current. The second ratio may be determined by a size ratio of the MOS transistor between the second mirror branch and the reference current branch, and the embodiment does not limit the specific second ratio.

Optionally, the second reference voltage generating module 3 may be further configured to be in an off state when the current power supply voltage does not satisfy the minimum power supply voltage required for generating the second reference voltage.

In a possible embodiment, the second reference voltage generation module 3 may generate the second reference voltage based on a voltage division principle of a resistor, and the second reference voltage does not exceed the power supply voltage input to the second reference voltage generation module 3 because no energy storage element is provided. Therefore, if the power supply voltage is less than the minimum power supply voltage required to be able to generate the second reference voltage, the output voltage will be less than the second reference voltage, which does not meet the requirements of the subsequent circuit, and may cause the problem of circuit failure.

Based on this, the present supply voltage may be compared with the minimum supply voltage required to generate the second reference voltage. If the current power voltage is greater than the minimum power voltage and meets the condition of generating the second reference voltage, the second reference voltage generating module 3 may be selectively turned on based on the requirement of the subsequent circuit. If the current power supply voltage is less than or equal to the minimum power supply voltage and does not meet the condition of generating the second reference voltage, the second reference voltage generation module 3 can be controlled to be in a turn-off state, so that the reference voltage which does not meet the requirement is prevented from being input into a post-stage circuit.

Optionally, referring to the schematic diagram of the reference current generating module shown in fig. 8, the reference current generating module 1 includes an operational amplifying unit 11, a third resistance module 12, and a reference current branch 13. A first input end of the reference current branch 13 is configured to receive a power supply voltage, a second input end of the reference current branch 13 is connected to a first end of the third resistor module, and a second end of the third resistor module is grounded.

The output end of the operational amplification unit 11 is connected with the reference current branch 13, the first input end is used for receiving the reference voltage, and the second input end is connected with the third resistance module 12;

a third resistance module 12, configured to generate a reference current based on the voltage at the second input terminal;

the reference current branch 13 is connected in series with the third resistance module 12, so that the reference current is copied by the mirror branch in mirror relationship with the reference current branch according to a preset ratio.

In one possible embodiment, the voltages at the first input terminal and the second input terminal of the operational amplifier unit 11 may be regarded as the same according to the pseudo-short characteristic thereof. The voltage of the second input terminal is connected to one end of the third resistor module 12 away from the ground terminal (i.e. the first end of the third resistor module 12), so that a potential difference is generated between two ends of the third resistor module 12, and a corresponding current is generated as a reference current.

According to the virtual-cut characteristic of the operational amplifier unit 11, the first input terminal and the second input terminal thereof are regarded as open circuit, that is, the reference current can be considered to flow from the first terminal of the reference current branch 13 receiving the power voltage to the second terminal of the third resistor module 12 connected to the ground. That is, the reference current flows through the reference current branch 13.

The reference current branch 13 and the first mirror branch or the second mirror branch constitute a current mirror circuit. When the above-mentioned reference current flows through the reference current branch 13, either mirror branch can reproduce the reference current in proportion according to the current mirror principle.

The embodiment of the application can obtain the following beneficial effects:

the reference voltage generating circuit comprises a reference current generating module, a first reference voltage generating module and a second reference voltage generating module, and different reference voltages can be output through the first reference voltage generating module and the second reference voltage generating module.

Based on the same inventive concept, the embodiment provides a reference voltage generation circuit applied to a fast charging circuit, which provides reference voltages for other modules in the fast charging circuit, and includes a sending module, a receiving module, a first detection circuit and a second detection circuit of the fast charging circuit. Referring to fig. 9, a schematic diagram of a fast charging circuit is shown, in which a first reference voltage generating module 2 in a reference voltage generating circuit is connected to a transmitting module 4, a receiving module 5, a first detecting circuit 6 and a second detecting circuit 7, and a second reference voltage generating module 3 is connected to the first detecting circuit 6.

In this embodiment, the reference voltage required by the transmitting module is 1V, and the reference voltage required by the receiving module is any one of 0.32-0.8V; the reference voltages required by the first detection circuit are respectively 0.2V, 0.4V, 0.6V, 0.8V, 1.23V, 1.6V, 2.18V and 2.6V, and the total number of the reference voltages is 8; the reference voltages required by the second detection circuit are 0.4V and 0.66V respectively, and the number of the gears is 2. Wherein the reference voltage of 1.6V or less may be generated by a power supply voltage of 2.2V, the reference voltage of 2.18V may be generated by a power supply voltage of at least 2.55V, and the reference voltage of 2.6V may be generated by a power supply voltage of at least 2.95V. In this embodiment, a reference voltage of 1.6V or less is used as the first reference voltage, and reference voltages of 2.18V and 2.6V are used as the second reference voltage.

Suitably, the first reference voltage generation module may include 2 first reference voltage generation branches, which are respectively used for generating a reference voltage less than or equal to 1.6V and a reference voltage of 1V; the second reference voltage generation module may include 2 second reference voltage generation branches for generating a reference voltage of 2.18V and a reference voltage of 2.6V, respectively.

The following description will be made based on the transmission module 4, the reception module 5, the first detection circuit 6, and the second detection circuit 7, respectively.

Referring to the schematic diagram of the transmitting module and the receiving module shown in fig. 10, the first reference voltage generating module 2 may be configured to provide reference voltages of the transmitting module 4 and the receiving module 5, and specifically, the first reference voltage generating module 2 may be configured to provide a reference voltage of 1V required by the transmitting module 4 and any one of reference voltages of 0.32V to 0.8V required by the receiving module 5.

Optionally, referring to the schematic diagram of the transmitting module and the receiving module shown in fig. 11, the first reference voltage generating module 2 includes at least two first reference voltage generating branches, where the first reference voltage generating branch for providing the reference voltage of the transmitting module 4 is different from the first reference voltage generating branch for providing the reference voltage of the receiving module 5.

A first reference voltage generating branch for providing a reference voltage of the transmitting module 4, which may be configured to conduct based on an enable signal of the fast charging circuit, so as to output the first reference voltage required by the transmitting module 4;

the first reference voltage generation branch for providing the reference voltage of the receiving module 5 may generate at least two first reference voltages, and may be configured to select and output a corresponding first reference voltage according to a first reference voltage selection signal, where the first reference voltage selection signal is used to indicate a currently required first reference voltage of the receiving module 5.

In one possible embodiment, the fast charging circuit has a sleep mode and a normal operation mode, and in the sleep mode, the fast charging circuit does not perform the fast charging operation.

Under the normal working mode of the quick charging circuit, the 1V reference voltage required by the sending module 4 may be greatly interfered, so that the 1V reference voltage can be generated by singly adopting a first reference voltage generation branch circuit, and the influence on other reference voltages is avoided. In the first reference voltage generating branch, a first switching module 23 may be provided to control whether the first reference voltage generating branch is turned on. The first switch module 23 may be controlled by an enable signal of the fast charging circuit, and when the enable signal controls the fast charging module 4 to work, the first switch module 23 is also turned on accordingly, so that the first reference voltage generation branch generates a 1V reference voltage and provides the reference voltage to the sending module 4. On the basis, the first reference voltage generation branch circuit for generating the 1V reference voltage is matched with the working state of the quick charging circuit, so that the power consumption in the sleep mode is reduced.

The reference voltage required by the receiving module 5 may be generated by another first reference voltage generating branch. The control circuit may determine the reference voltage currently required by the receiving module 5 (e.g. 0.8V) and generate a corresponding first reference voltage selection signal (e.g. a signal for selecting a reference voltage of 0.8V) which is selected for the output of the first reference voltage generating branch. Thus, the first reference voltage generating branch may output the currently required reference voltage to the receiving module 5.

As an example, if the first reference voltage generation branch includes the first resistance module as shown in fig. 3, a first selection circuit may be adopted, and a reference voltage of 0.32-0.8V is used as an input of the first selection circuit, and a first reference voltage selection signal is used as a control strobe signal of the first selection circuit. If the first reference voltage selection signal indicates that the required reference voltage is 0.8V, the 0.8V reference voltage may be gated by the first selection circuit and coupled to the receiving module.

As another example, if the first reference voltage generation branch includes a first resistance module as shown in fig. 4, a resistance value of the first resistance module may be adjusted by the first reference voltage selection signal, so that a corresponding reference voltage may be generated by the first resistance module, and the reference voltage is connected to the receiving module.

The following description will be made based on the first detection circuit.

The first detection circuit 6 may be configured to detect a connection condition of an external device of the fast charging circuit, and operate in both a sleep mode and a normal operating mode of the fast charging circuit. Referring to the first comparison circuit schematic diagram shown in fig. 12, the first reference voltage generation module 2 and the second reference voltage generation module 3 are configured to provide the reference voltage of the first detection circuit 6, and specifically, the first reference voltage generation module 2 may be used to provide the reference voltages (i.e., the first reference voltage) of 6 steps of 0.2V, 0.4V, 0.6V, 0.8V, 1.23V, and 1.6V, and the second reference voltage generation module 3 may be used to provide the reference voltages (i.e., the second reference voltage) of 2 steps of 2.18V and 2.6V.

Optionally, the first reference voltage generation branch of the first reference voltage generation module 2, which is used for providing the reference voltage of the first detection circuit 6, may generate at least two first reference voltages, and may be configured to select and output a corresponding first reference voltage according to a second reference voltage selection signal, where the second reference voltage selection signal is used for indicating a currently required first reference voltage of the first detection circuit 6;

the second reference voltage generation branch of the second reference voltage generation module 3 for providing the reference voltage of the first detection circuit 6 may generate at least two second reference voltages and may be configured to select and output the corresponding second reference voltages according to a third reference voltage selection signal, where the third reference voltage selection signal is used to indicate the currently required second reference voltage of the first detection circuit 6.

Optionally, the first detection circuit 6 may include a first comparison circuit, and the first comparison circuit is configured to compare a reference voltage of the first detection circuit with a voltage of an interface where the fast charging circuit is connected to the external device, so as to detect a connection condition of the external device of the fast charging circuit through a comparison result of the first comparison circuit.

In a possible embodiment, the quick charging module 4 may be connected to an external device (which may be a power-using device or a power-supplying device) through a CC (Configuration Channel) port, so as to implement quick charging. A first input of the first comparison circuit may be connected to the CC port and a second input may be for receiving a reference voltage. The control circuit may generate corresponding reference voltage selection signals (including the second reference voltage selection signal and the third reference voltage selection signal) to switch the reference voltages of different gear positions based on the reference voltage selection signals, and only one gear position of the reference voltages is connected to the first detection circuit 6 at the same time. The first comparison circuit compares the voltage of the CC port with the current reference voltage, and the output judgment signal can enable the control circuit to judge the connection condition of the external equipment.

As shown in the schematic diagram of the first detection circuit shown in fig. 13, the first reference voltage generation branch of the first reference voltage generation module 2 for generating the reference voltage less than or equal to 1.6V may be adopted to generate the reference voltages of 0.2V, 0.4V, 0.6V, 0.8V, 1.23V, and 1.6V. The embodiment of the first reference voltage generating module 2 for generating the reference voltages of 0.2V, 0.4V, 0.6V, 0.8V, 1.23V and 1.6V is the same as the embodiment of the first reference voltage generating module for generating the reference voltages of 0.32V to 0.8V required by the receiving module 5, and is not repeated here.

In some application scenarios, the embodiment of the second reference voltage generating module 3 for generating the reference voltages of 2.18V and 2.6V is also the same as the above embodiment for generating the reference voltages of 0.32V to 0.8V required by the receiving module 5, and is not described herein again.

In other application scenarios, as shown in fig. 13, in the second reference voltage generation module 3, different second reference voltage generation branches may be adopted to generate reference voltages of 2.18V and 2.6V, respectively. In any of the second reference voltage generating branches, a second switching module 33 may be provided to control whether the second reference voltage generating branch is turned on. The second switch module 33 corresponding to the 2.18V reference voltage may be controlled based on the reference voltage selection signal corresponding to 2.18V, the second switch module 33 corresponding to the 2.6V reference voltage may be controlled based on the reference voltage selection signal corresponding to 2.6V, when switching to any reference voltage, the second reference voltage generation branch corresponding to the reference voltage may operate, and the second reference voltage generation branch corresponding to another reference voltage may not operate.

The reason for adopting different second reference voltage generation branches is that the minimum power voltage of the current chip is usually 2.2V, and in some possible embodiments, because the mirror branch adopting the current mirror generates current and generates reference voltage by dividing voltage based on the resistance module, the MOS transistor in the mirror branch has a certain voltage drop, and the reference voltage generated based on the 2.2V power voltage cannot reach 2.18V or 2.6V, and can reach 1.6V. Considering the voltage drop of the mirror branch, the minimum power voltage for generating 2.18V may be 2.55V, and the minimum power voltage for generating 2.6V may be 2.95V, so that the second reference voltage generation branches of 2.18V and 2.6V may be separately set to adapt to different power voltage situations. Also, the power consumption of the reference voltage generating circuit is high at a power supply voltage of 2.55V or 2.95V, and thus, additional power consumption can be reduced by selectively enabling the second reference voltage generating branch.

The following description will be made based on the second detection circuit.

The second detection circuit 7 may be configured to detect a communication state of the fast charging circuit, and operate in both a sleep mode and a normal operating mode of the fast charging module. Referring to the second comparison circuit schematic diagram shown in fig. 14, the first reference voltage generation module 2 is configured to provide the reference voltage of the second detection circuit 7, and specifically, the first reference voltage generation module 2 may be used to provide the reference voltage (i.e., the first reference voltage) of 2 steps of 0.4V and 0.66V.

Optionally, the first reference voltage generation branch of the first reference voltage generation module 2 for providing the reference voltage of the second detection circuit 7 may generate at least two first reference voltages, and may be configured to output corresponding first reference voltages according to a fourth reference voltage selection signal, where the fourth reference voltage selection signal is used to indicate the first reference voltage currently required by the second detection circuit 7.

Optionally, the second detection circuit 7 may include a second comparison circuit, and the second comparison circuit is configured to compare a reference voltage of the second detection circuit with a voltage of an interface where the fast charging circuit is connected to the external device, so that a communication detection function of the fast charging circuit is enabled according to a comparison result of the second comparison circuit.

In one possible embodiment, a first input terminal of the second comparator circuit may be connected to the CC port, and a second input terminal may be configured to receive a reference voltage. The control circuit may generate a corresponding fourth reference voltage selection signal to switch the reference voltages of different gear positions based on the fourth reference voltage selection signal, and only the reference voltage of one gear position is switched into the second detection circuit 7 at the same time. The second comparison circuit compares the voltage of the CC port with the current reference voltage, and the output judgment signal can enable the control circuit to judge whether the quick charging circuit is communicated or not.

As shown in the schematic diagram of the second detection circuit shown in fig. 15, the first reference voltage generation branch of the first reference voltage generation module 2 for generating the reference voltage less than or equal to 1.6V may be adopted to generate the reference voltages of 0.4V and 0.66V. The embodiment of the first reference voltage generating module 2 for generating the reference voltages of 0.4V and 0.66V is the same as the embodiment for generating the reference voltages of 0.32V to 0.8V required by the receiving module 5, and is not described herein again.

The embodiment of the application can obtain the following beneficial effects:

(1) The first reference voltage generation module is adopted to generate various reference voltages which are less than or equal to 1.6V, the second reference voltage generation module is adopted to generate reference voltages of 2.18V and 2.6V, and the second reference voltage generation module can be selectively conducted, so that the reference voltage generation circuit can reduce extra power consumption while supporting the output of various reference voltages.

(2) The reference voltage generation branch circuit for generating the 1V reference voltage is independently arranged, can be controlled based on the enabling signal of the quick charging module, is matched with the working state of the quick charging module, avoids the influence on other reference voltages, and reduces the power consumption in the sleep mode.

The embodiment of the application also provides a control method of the reference voltage generating circuit, which can be used for controlling the reference voltage generating circuit. Referring to a flowchart of a control method of the reference voltage generation circuit shown in fig. 16, the method may be as follows:

step 1601, generating, by the reference current generation module, a reference current based on an input voltage;

step 1602, generating, by the first reference voltage generation module, at least one first current based on the reference current, and outputting a corresponding first reference voltage based on the first current;

step 1603, when the reference voltage required by the post-stage circuit includes a second reference voltage, generating, by the second reference voltage generation module, at least one second current based on the reference current, and outputting a corresponding second reference voltage based on the second current, where the second reference voltage is greater than the first reference voltage.

Optionally, the first reference voltage generation module includes at least one first reference voltage generation branch, and the first reference voltage generation branch includes a first current generation module and a first resistance module;

the generating, by the first reference voltage generating module, at least one first current based on the reference current and outputting a corresponding first reference voltage based on the first current includes:

generating, by the first current generation module, the first current based on the reference current;

generating, by the first resistance module, a corresponding first reference voltage based on the first current and a resistance unit through which the first current flows in the first resistance module.

Optionally, the first resistance module includes a plurality of first resistance units, and the first current flows through the plurality of first resistance units and generates different first reference voltages at end points of different first resistance units.

Optionally, the first reference voltage generating branch further includes a first selection circuit, and the method further includes:

and controlling the first selection circuit to select the first reference voltage generated by the end point of one or more first resistance units.

Optionally, the first resistance module includes a second resistance unit with an adjustable resistance value, and is configured to output a current first reference voltage generated by a current resistance value through an output port of the second resistance unit.

Optionally, the first reference voltage generating branch further includes a first switch module, and the method further includes:

and controlling the first switch module to conduct the first reference voltage generation branch when the reference voltage required by the post-stage circuit of the reference voltage generation circuit comprises the first reference voltage corresponding to the first reference voltage generation branch.

Optionally, the first current generation module includes a first mirror image branch, and the first mirror image branch and a reference current branch included in the reference current generation module form a mirror image relationship;

the generating, by the first current generation module, the first current based on the reference current includes:

the reference current flowing through the reference current branch is replicated by the first mirroring branch according to a first proportion, thereby generating the first current.

Optionally, the second reference voltage generating module includes at least one second reference voltage generating branch, and the second reference voltage generating branch includes a second switch module, a second current generating module, and a second resistance module;

the generating, by the second reference voltage generating module, at least one second current based on the reference current and outputting a corresponding second reference voltage based on the second current includes:

controlling the second switch module to conduct the second reference voltage generation branch when the reference voltage required by the rear-stage circuit comprises a second reference voltage corresponding to the second reference voltage generation branch;

when the second reference voltage generation branch is turned on, generating, by the second current generation module, the second current based on the reference current;

generating, by the second resistance module, a corresponding second reference voltage based on the second current and a resistance unit through which the second current flows in the second resistance module.

Optionally, the second resistance module includes a plurality of third resistance units, and the second current flows through the plurality of third resistance units and generates different second reference voltages at end points of different third resistance units.

Optionally, the second reference voltage generating branch further includes a second selection circuit, and the method further includes:

and controlling the second selection circuit to select the second reference voltage generated by the end point of one or more third resistance units.

Optionally, the second resistance module includes a fourth resistance unit with an adjustable resistance value, and is configured to output, through an output port of the fourth resistance unit, the current second reference voltage generated by the current resistance value.

Optionally, the second current generation module includes a second mirror branch, and the second mirror branch and the reference current branch included in the reference current generation module form a mirror relationship;

the generating, by the second current generation module, the second current based on the reference current includes:

the reference current flowing through the reference current branch is replicated by the second mirror branch according to a second proportion, thereby generating the second current.

Optionally, the method further includes:

and when the current power supply voltage does not meet the minimum power supply voltage required by the generation of the second reference voltage, controlling the second reference voltage generation module to be in an off state.

Optionally, the reference current generating module includes an operational amplifying unit, a third resistance module, and a reference current branch, where a first input end of the operational amplifying unit is configured to receive the input voltage, a second input end of the operational amplifying unit is connected to the third resistance module, and an output end of the operational amplifying unit is connected to the reference current branch;

the generating, by the reference current generation module, a reference current based on an input voltage includes:

generating a voltage of the second input terminal based on the input voltage;

generating, by the third resistance module, the reference current based on the voltage of the second input terminal;

the reference current branch is connected with the third resistor module in series, so that the reference current is copied by a mirror branch which forms a mirror relationship with the reference current branch according to a preset proportion.

Optionally, the post-stage circuit of the reference voltage generating circuit includes a fast charging circuit, and the fast charging circuit includes a transmitting module and a receiving module;

the method further comprises the following steps:

and controlling the first reference voltage generation module to provide the reference voltages of the sending module and the receiving module.

Optionally, the first reference voltage generating module includes at least two first reference voltage generating branches, where the first reference voltage generating branch for providing the reference voltage of the transmitting module is different from the first reference voltage generating branch for providing the reference voltage of the receiving module.

Optionally, the controlling the first reference voltage generating module to provide the reference voltages of the transmitting module and the receiving module includes:

the first reference voltage generation branch circuit for providing the reference voltage of the sending module is controlled to be conducted based on the enabling signal of the quick charging circuit, so that the first reference voltage required by the sending module is output;

and controlling the first reference voltage generation branch for providing the reference voltage of the receiving module, and selecting and outputting the corresponding first reference voltage according to a first reference voltage selection signal, wherein the first reference voltage generation branch for providing the reference voltage of the receiving module is used for generating at least two first reference voltages, and the first reference voltage selection signal is used for indicating the first reference voltage currently required by the receiving module.

Optionally, the post-stage circuit of the reference voltage generating circuit includes a first detection circuit of the fast charging circuit, where the first detection circuit is configured to detect a connection condition of an external device of the fast charging circuit;

the method further comprises the following steps:

and controlling the first reference voltage generation module and the second reference voltage generation module to provide the reference voltage of the first detection circuit.

Optionally, the controlling the first reference voltage generating module and the second reference voltage generating module to provide the reference voltage of the first detecting circuit includes:

in the first reference voltage generation module, controlling a first reference voltage generation branch for providing a reference voltage of the first detection circuit, and selecting and outputting a corresponding first reference voltage according to a second reference voltage selection signal, wherein the first reference voltage generation branch for providing the reference voltage of the first detection circuit is used for generating at least two first reference voltages, and the second reference voltage selection signal is used for indicating a first reference voltage currently required by the first comparison circuit;

and in the second reference voltage generation module, controlling a second reference voltage generation branch for providing the reference voltage of the first detection circuit, and selecting and outputting a corresponding second reference voltage according to a third reference voltage selection signal, wherein the second reference voltage generation branch for providing the reference voltage of the first detection circuit is used for generating at least two second reference voltages, and the third reference voltage selection signal is used for indicating a second reference voltage currently required by the first comparison circuit.

Optionally, the first detection circuit includes a first comparison circuit, and the first comparison circuit is configured to compare a reference voltage of the first detection circuit with a voltage of an interface where the fast charging circuit is connected to an external device, so as to detect a connection condition of the external device of the fast charging circuit through a comparison result of the first comparison circuit.

Optionally, the post-stage circuit of the reference voltage generating circuit includes a second detection circuit, and the second detection circuit is configured to detect a communication state of the fast charging circuit;

the method further comprises the following steps:

and controlling the first reference voltage generation module to provide the reference voltage of the second detection circuit.

Optionally, the controlling the first reference voltage generating module to provide the reference voltage of the second detecting circuit includes:

in the first reference voltage generation module, a first reference voltage generation branch for providing the reference voltage of the second detection circuit is controlled, and a corresponding first reference voltage is selected and output according to a fourth reference voltage selection signal, wherein the first reference voltage generation branch for providing the reference voltage of the second detection circuit is used for generating at least two first reference voltages, and the fourth reference voltage selection signal is used for indicating the first reference voltage currently required by the second comparison circuit.

Optionally, the second detection circuit includes a second comparison circuit, and the second comparison circuit is configured to compare a reference voltage of the second detection circuit with a voltage of an interface where the fast charging circuit is connected to an external device, so that a communication detection function of the fast charging circuit is enabled through a comparison result of the second comparison circuit.

The embodiment of the application can obtain the following beneficial effects:

The embodiment of the application also provides a chip which comprises the reference voltage generating circuit provided by the embodiment of the application. The Chip may be, but is not limited to, an SOC (System on Chip) Chip or an SIP (System in package) Chip. The chip can reduce the power consumption for generating the reference voltage by configuring the reference voltage generating circuit.

The embodiment of the application further provides electronic equipment which comprises an equipment main body and the chip arranged in the equipment theme. The electronic device may be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a mobile power supply, a wireless charger, a quick charger, a vehicle charger, an adapter, a display, a USB (Universal Serial Bus) docking station, a stylus, a true wireless headset, a car center screen, a car, an intelligent wearable device, a mobile terminal, and an intelligent home device. The intelligent wearable device comprises but is not limited to an intelligent watch, an intelligent bracelet and a cervical vertebra massager. Mobile terminals include, but are not limited to, smart phones, laptops, tablets, point of sale (POS) machines. The intelligent household equipment comprises but is not limited to an intelligent socket, an intelligent electric cooker, an intelligent sweeper and an intelligent lamp. The electronic device can reduce the power consumption for generating the reference voltage by configuring the reference voltage generating circuit.

Although the present application has been described with reference to the preferred embodiments, it is to be understood that the present application is not limited to the disclosed embodiments, but rather, the present application is intended to cover various modifications, equivalents and alternatives falling within the spirit and scope of the present application.

Claims

1. A reference voltage generation circuit is characterized by comprising a reference current generation module, a first reference voltage generation module and a second reference voltage generation module;

2. The reference voltage generating circuit according to claim 1, wherein the first reference voltage generating module comprises at least one first reference voltage generating branch, and the first reference voltage generating branch comprises a first current generating module and a first resistance module;

the first current generation module is used for generating the first current based on the reference current;

the first resistance module is configured to generate a corresponding first reference voltage based on the first current and a resistance unit through which the first current flows in the first resistance module.

3. The reference voltage generating circuit of claim 2, wherein the first resistor module comprises a plurality of first resistor units, the first current flows through the plurality of first resistor units, and different first reference voltages are generated at terminals of different first resistor units.

4. The reference voltage generating circuit according to claim 3, wherein the first reference voltage generating branch further comprises a first selection circuit for selecting the first reference voltage generated by the terminal of one or more of the first resistance units.

5. The reference voltage generating circuit of claim 2, wherein the first resistor module includes a second resistor unit with an adjustable resistance value, and is configured to output the current first reference voltage generated by the current resistance value through an output port of the second resistor unit.

6. The reference voltage generation circuit according to claim 2, wherein the first reference voltage generation branch further comprises a first switch module, and the first switch module is configured to turn on the first reference voltage generation branch when the reference voltage required by the subsequent circuit of the reference voltage generation circuit includes a first reference voltage corresponding to the first reference voltage generation branch.

7. The reference voltage generating circuit according to any one of claims 2 to 6, wherein the first current generating module comprises a first mirror branch, and the first mirror branch forms a mirror relationship with a reference current branch included in the reference current generating module;

the first mirror branch is used for copying the reference current flowing through the reference current branch according to a first proportion, so that the first current is generated.

8. The reference voltage generating circuit of claim 1, wherein the second reference voltage generating module comprises at least one second reference voltage generating branch, the second reference voltage generating branch comprising a second switching module, a second current generating module, and a second resistance module;

the second switch module is configured to turn on the second reference voltage generation branch when the reference voltage required by the post-stage circuit includes a second reference voltage corresponding to the second reference voltage generation branch;

the second current generation module is configured to generate the second current based on the reference current when the second reference voltage generation branch is turned on;

the second resistance module is configured to generate a corresponding second reference voltage based on the second current and a resistance unit through which the second current flows in the second resistance module.

9. The reference voltage generating circuit of claim 8, wherein the second resistor module comprises a plurality of third resistor units, wherein the second current flows through the plurality of third resistor units, and wherein different second reference voltages are generated at terminals of different third resistor units.

10. The reference voltage generating circuit according to claim 9, wherein the second reference voltage generating branch further comprises a second selection circuit for selecting the second reference voltage generated by the terminal of one or more of the third resistance units.

11. The reference voltage generating circuit of claim 8, wherein the second resistor module comprises a fourth resistor unit with an adjustable resistance value, and is configured to output the current second reference voltage generated by the current resistance value through an output port of the fourth resistor unit.

12. The reference voltage generating circuit according to any one of claims 8 to 11, wherein the second current generating module comprises a second mirror branch, and the second mirror branch forms a mirror relationship with a reference current branch included in the reference current generating module;

the second mirror branch is configured to copy the reference current flowing through the reference current branch according to a second ratio, thereby generating the second current.

13. The reference voltage generation circuit of claim 1, wherein the second reference voltage generation module is further configured to be in an off state when a current supply voltage does not meet a minimum supply voltage required to generate the second reference voltage.

14. The reference voltage generation circuit according to claim 1, wherein the reference current generation module comprises an operational amplification unit, a third resistance module and a reference current branch;

the first input end of the operational amplification unit is used for receiving the input voltage, the second input end of the operational amplification unit is connected with the third resistance module, and the output end of the operational amplification unit is connected with the reference current branch circuit;

the third resistance module is used for generating the reference current based on the voltage of the second input end;

the reference current branch is connected with the third resistor module in series, so that the reference current is copied by a mirror branch which forms a mirror relation with the reference current branch according to a preset proportion.

15. The reference voltage generation circuit according to claim 1, wherein a subsequent stage circuit of the reference voltage generation circuit includes a fast charge circuit, the fast charge circuit including a transmission module and a reception module;

the first reference voltage generating module is used for providing reference voltages of the transmitting module and the receiving module.

16. The reference voltage generating circuit according to claim 15, wherein the first reference voltage generating module comprises at least two first reference voltage generating branches, wherein the first reference voltage generating branch for providing the reference voltage of the transmitting module is different from the first reference voltage generating branch for providing the reference voltage of the receiving module.

17. The reference voltage generation circuit of claim 16,

the first reference voltage generation branch circuit for providing the reference voltage of the transmitting module is configured to be turned on based on an enable signal of the fast charging circuit, so as to output the first reference voltage required by the transmitting module;

the first reference voltage generation branch for providing the reference voltage of the receiving module is used for generating at least two first reference voltages and is configured to select and output the corresponding first reference voltage according to a first reference voltage selection signal, wherein the first reference voltage selection signal is used for indicating the first reference voltage currently required by the receiving module.

18. The reference voltage generation circuit according to claim 1, wherein the post-stage circuit of the reference voltage generation circuit includes a first detection circuit of the fast charging circuit, and the first detection circuit is configured to detect a connection condition of an external device of the fast charging circuit;

the first reference voltage generation module and the second reference voltage generation module are used for providing a reference voltage of the first detection circuit.

19. The reference voltage generating circuit of claim 18, wherein the first reference voltage generating branch of the first reference voltage generating module for providing the reference voltage of the first detecting circuit is configured to generate at least two first reference voltages and configured to select and output the corresponding first reference voltages according to a second reference voltage selecting signal, wherein the second reference voltage selecting signal is used for indicating the first reference voltage currently required by the first detecting circuit;

the second reference voltage generation branch of the second reference voltage generation module, which is used for providing the reference voltage of the first detection circuit, is used for generating at least two second reference voltages and is configured to select and output a corresponding second reference voltage according to a third reference voltage selection signal, wherein the third reference voltage selection signal is used for indicating the second reference voltage currently required by the first detection circuit.

20. The reference voltage generating circuit of claim 18, wherein the first detecting circuit comprises a first comparing circuit, and the first comparing circuit is configured to compare the reference voltage of the first detecting circuit with a voltage of an interface of the fast charging circuit and an external device, so as to detect the external device connection condition of the fast charging circuit according to a comparison result of the first comparing circuit.

21. The reference voltage generation circuit according to claim 1, wherein the subsequent stage circuit of the reference voltage generation circuit includes a second detection circuit for detecting a communication state of the fast charge circuit;

the first reference voltage generation module is used for providing a reference voltage of the second detection circuit.

22. The reference voltage generating circuit of claim 21, wherein the first reference voltage generating branch of the first reference voltage generating module for providing the reference voltage of the second detecting circuit is configured to generate at least two first reference voltages and configured to select and output the corresponding first reference voltage according to a fourth reference voltage selecting signal, wherein the fourth reference voltage selecting signal is used for indicating the first reference voltage currently required by the second detecting circuit.

23. The reference voltage generating circuit of claim 21, wherein the second detecting circuit comprises a second comparing circuit, and the second comparing circuit is configured to compare the reference voltage of the second detecting circuit with a voltage of an interface of the fast charging circuit connected to an external device, so that a communication detecting function of the fast charging circuit is enabled through a comparison result of the second comparing circuit.

24. A control method of a reference voltage generation circuit, wherein the reference voltage generation circuit comprises a reference current generation module, a first reference voltage generation module and a second reference voltage generation module, the method comprising:

when the reference voltage required by the rear-stage circuit comprises a second reference voltage, generating at least one second current based on the reference current through the second reference voltage generating module, and outputting a corresponding second reference voltage based on the second current, wherein the second reference voltage is greater than the first reference voltage.

25. A chip comprising the reference voltage generation circuit of any one of claims 1-23.

26. An electronic device comprising the reference voltage generation circuit of any one of claims 1-23.