Power supply circuit, power supply chip, vehicle and Ethernet physical layer interface circuit module

Abstract

The utility model provides a power supply circuit, a power supply chip, a vehicle and an Ethernet physical layer interface circuit module, and the power supply circuit comprises a first power module which is used for providing a power supply voltage; the second power module comprises a switch, the input end of the switch is connected with the power supply voltage, the control end of the switch is connected with a switch control input signal, the output end of the switch is connected with a load, and the load is further connected with the power supply voltage; when the load is dormant, the switch controls the input signal to be in a first state, and the switch is cut off; when the load works, the switch controls the input signal to be in a second state, and the switch is turned on. According to the utility model, only one power supply chip is used as one path of power supply input, and then the power supply module formed by the resistor, the capacitor and the field effect transistor is used for replacing the other power supply chip as the other path of power supply input, so that the load does not need to be adjusted when power is supplied to the load. Moreover, the total cost of the resistor, the capacitor and the field effect transistor is far lower than the cost of the power supply chip, so that the power supply cost of the load can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a power supply circuit and a power supply chip, a vehicle, and an Ethernet physical layer interface circuit module. Background Art

[0002] Currently, Ethernet physical layer interface chips that support Ethernet wake-up require two power inputs. One is the power-off input when the chip is in sleep mode, usually 12V power supply, which is used to output a wake-up signal after wake-up; the other is the power-off input when the chip is in sleep mode, usually 3.3V power supply, which is used to power other logic devices in the chip.

[0003] In order to achieve lower chip manufacturing costs, chip suppliers will change the uninterrupted power input during sleep from 12V to 3.3V. As a result, when using the Ethernet wake-up function of the chip, two different 3.3V power supplies need to be connected, which will increase the power supply cost. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a power supply circuit and a power supply chip, a vehicle, and an Ethernet physical layer interface circuit module, so as to solve the technical problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a power supply circuit, including:

[0006] A first power supply module, used for providing a power supply voltage;

[0007] A second power supply module comprises a switch, wherein an input terminal of the switch is connected to the supply voltage, a control terminal of the switch is connected to a switch control input signal, an output terminal of the switch is connected to a load, and the load is also connected to the supply voltage;

[0008] Wherein, when the load is dormant, the switch control input signal is in the first state, and the switch is turned off;

[0009] When the load is working, the switch control input signal is in the second state, and the switch is turned on.

[0010] In an embodiment of the present invention, the switch is a field effect transistor, and the first state and the second state of the switch control input signal are determined by the channel type of the field effect transistor.

[0011] In one embodiment of the present invention, the second power module further includes: a first resistor, a second resistor, a first capacitor, and a second capacitor;

[0012] The input end of the field effect tube is respectively connected to the supply voltage, the first end of the first resistor and the first end of the first capacitor;

[0013] The control end of the field effect tube is respectively connected to the second end of the first resistor, the second end of the first capacitor and the first end of the second resistor;

[0014] The output end of the field effect tube is connected to the load and the first end of the second capacitor respectively;

[0015] A second end of the second resistor is connected to the switch control input signal, and a second end of the second capacitor is grounded.

[0016] In an embodiment of the present invention, the resistance values ​​of the first resistor and the second resistor are determined by the channel type of the field effect transistor.

[0017] In an embodiment of the present invention, the capacitance of the first capacitor is determined by the resistance of the second resistor and the load.

[0018] In an embodiment of the present invention, the capacitance value of the second capacitor is determined by the resistance value of the first resistor, the capacitance value of the first capacitor, and the load.

[0019] In an embodiment of the present invention, the field effect transistor is a P-channel field effect transistor, and the first power module is composed of a voltage regulator.

[0020] The utility model also provides a power supply chip, and the power supply chip includes any power supply circuit as described above.

[0021] The utility model also provides a vehicle, wherein the vehicle comprises the power supply chip as described above.

[0022] The utility model also provides an Ethernet physical layer interface circuit module, including:

[0023] Ethernet physical layer interface chip;

[0024] A first power supply module, used for providing a power supply voltage, and the power supply voltage is connected to the Ethernet physical layer interface chip;

[0025] A second power supply module comprises a switch, wherein an input terminal of the switch is connected to the supply voltage, a control terminal of the switch is connected to a switch control input signal, and an output terminal of the switch is connected to the Ethernet physical layer interface chip;

[0026] Wherein, when the Ethernet physical layer interface chip is in sleep mode, the switch control input signal is in the first state, and the switch is turned off;

[0027] When the Ethernet physical layer interface chip is working, the switch control input signal is in the second state, and the switch is turned on.

[0028] As described above, the utility model provides a power supply circuit and a power supply chip, a vehicle, and an Ethernet physical layer interface circuit module, which have the following beneficial effects: by using resistors, capacitors, and field effect transistors to form a power supply module with a switch function, the switch can be turned on when the load is working, and the switch can be turned off when the load is dormant, so that the power module can be used to achieve the effect of powering off when the load is dormant and powering when working. At the same time, compared with the existing power supply scheme that directly uses two power supply chips as two power supply inputs, the utility model only needs to use one power supply chip as one of the power supply inputs, and then replace the other power supply chip with a power supply module formed by resistors, capacitors, and field effect transistors as another power supply input, and the load does not need to be adjusted when the load is powered. Moreover, since the total cost of resistors, capacitors, and field effect transistors is much lower than the cost of power supply chips, the utility model can reduce the power supply cost of the load. For example, when the load is an Ethernet physical layer interface chip, the utility model can reduce the power supply cost when realizing the Ethernet wake-up function. Therefore, compared with the existing power supply scheme, the power supply cost of the utility model is much lower than the existing scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A circuit connection diagram of a power supply circuit in a prior art solution provided in an embodiment;

[0030] Figure 2 A schematic diagram of the hardware structure of a power supply circuit provided in an embodiment of the present utility model;

[0031] Figure 3 A circuit connection diagram of a power supply circuit provided in another embodiment of the utility model;

[0032] Figure 4 A schematic diagram of the hardware structure of an Ethernet physical layer interface circuit module provided in an embodiment of the present utility model;

[0033] Figure 5 This is a circuit connection diagram of an Ethernet physical layer interface circuit module provided in another embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0035] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] like Figure 1 As shown in the figure, for Ethernet physical layer interface chips that support Ethernet wake-up, the existing power supply solution generally uses two power supply chips as two power supply inputs. However, if two power supply chips are used to provide two 3.3V power supplies when supporting the Ethernet wake-up function, it will directly increase the power supply cost of the enterprise.

[0037] In order to solve the above problems, in an exemplary embodiment of the present utility model, the embodiment provides a power supply circuit, such as Figure 2 As shown, Figure 2 FIG. 1 is a schematic diagram showing the hardware structure of the power supply circuit provided in this embodiment. The power supply circuit 100 specifically includes:

[0038] A first power supply module, used for providing a power supply voltage;

[0039] A second power supply module comprises a switch, wherein an input terminal of the switch is connected to a power supply voltage, a control terminal of the switch is connected to a switch control input signal, an output terminal of the switch is connected to a load, and the load is also connected to the power supply voltage;

[0040] When the load is dormant, the switch control input signal is in the first state and the switch is turned off; when the load is working, the switch control input signal is in the second state and the switch is turned on.

[0041] According to the above records, the switch in this embodiment is a field effect tube MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET for short) switch control input signal of the first state and the second state, which is determined by the channel type of the field effect tube MOSFET. Among them, the channel type of the field effect tube MOSFET includes: P channel type and N channel type. That is, the switch in the above embodiment can be a P channel field effect tube MOSFET, or it can be an N channel field effect tube MOSFET. As an example, for example, if the switch is a P channel field effect tube MOSFET, the first state of the switch control input signal is to output a low level signal, and the second state of the switch control input signal is to release the low level and output a high level signal. In this embodiment, the high level is relatively high in voltage compared with the low level.

[0042] According to the above records, in an exemplary embodiment, the second power supply module also includes: a first resistor, a second resistor, a first capacitor, and a second capacitor. Among them, the input end of the field effect tube is respectively connected to the supply voltage, the first end of the first resistor and the first end of the first capacitor; the control end of the field effect tube is respectively connected to the second end of the first resistor, the second end of the first capacitor and the first end of the second resistor; the output end of the field effect tube is respectively connected to the load and the first end of the second capacitor; the second end of the second resistor is connected to the switch control input signal, and the second end of the second capacitor is grounded. In this embodiment, the resistance values ​​of the first resistor and the second resistor are determined by the channel type of the field effect tube; the capacitance value of the first capacitor is determined by the resistance value of the second resistor and the load; the capacitance value of the second capacitor is determined by the resistance value of the first resistor, the capacitance value of the first capacitor and the load; the first power supply module is composed of a voltage regulator.

[0043] According to the above records, as an example, if the load is an Ethernet physical layer interface chip, such as Figure 3 As shown, Figure 3 The circuit connection diagram of the power supply circuit provided in this embodiment is shown. The power supply circuit in this embodiment can be used to power the Ethernet physical layer interface chip to support Ethernet wake-up. Specifically,

[0044] The first power supply module is composed of an LDO chip, which is used to provide a 3.3V power supply for the Ethernet physical layer interface chip. The LDO chip is the abbreviation of a low dropout regulator chip.

[0045] The second power supply module includes a capacitor C1, a resistor R1, a resistor R2, a field effect transistor Q1 and a capacitor C2; wherein the source of the field effect transistor Q1 is connected as an input end to the power supply voltage, the first end of the resistor R1 and the first end of the capacitor C1 respectively; the gate of the field effect transistor Q1 is connected as a control end to the second end of the resistor R1, the second end of the capacitor C1 and the first end of the resistor R2 respectively; the drain of the field effect transistor Q1 is connected as an output end to the Ethernet physical layer interface chip and the first end of the capacitor C2 respectively; the second end of the resistor R2 is connected to the switch control input signal, and the second end of the capacitor C2 is grounded.

[0046] The implementation process of the power supply circuit in this embodiment can be: when the Ethernet physical layer interface chip works normally, the switch controls the input signal to output a low-level signal, and after the capacitor C1 is fully charged through the resistor R2, the resistors R1 and R2 form a voltage divider, so that the gate and source of the field effect transistor Q1 produce a voltage difference, and the field effect transistor Q1 is turned on. When the Ethernet physical layer interface chip is dormant, the switch controls the input signal to release a low level and output a high-level signal, the capacitor C1 is discharged through the resistor R1, the voltage difference between the two ends of the resistor R1 disappears, and the field effect transistor Q1 is turned off.

[0047] According to the above records, in this embodiment, Figure 3 The field effect transistor Q1 in the controller is a P-channel field effect transistor, which is used to shut down part of the 3.3V power output of the LDO chip when the controller is in sleep mode, and to supply power to the 3.3V input of the Ethernet physical layer interface chip that is powered off when in sleep mode. Resistors R1 and R2 are used to provide bias voltage for turning on the field effect transistor Q1, and their actual values ​​are determined by the actual model of the field effect transistor Q1. Capacitor C1 is used to extend the turn-on time of the field effect transistor Q1, and its actual value is determined by the resistance value of resistor R2 and the model of the Ethernet physical layer interface chip. Capacitor C2 is used to provide short-term supplementary power supply for the Ethernet physical layer interface chip when the power is off during the shutdown process of the field effect transistor Q1, and its actual value is determined by the resistance value of resistor R1, the capacitance of capacitor C1, and the model of the Ethernet physical layer interface chip. The switch control input signal is an external input signal, which is used to provide drive for turning on the field effect transistor Q1.

[0048] It can be seen that the present embodiment uses a 3.3V LDO chip to provide a 3.3V power supply, and then uses a field effect tube MOSFET as a switch. By controlling the opening and closing of the field effect tube MOSFET, the 3.3V is divided into two paths: one that does not turn on the power in the dormant state before the field effect tube MOSFET and the other that does not turn on the power in the dormant state after the field effect tube MOSFET. The two 3.3V power inputs of the chip are powered respectively, and an RC energy storage circuit is formed by resistor R1, resistor R2 and capacitor C1 to control the conduction time of the field effect tube MOSFET to meet the power-on slope requirement of the Ethernet physical layer interface chip. Capacitor C2 is added as a supplementary capacitor to compensate for the problem of unstable power supply of the Ethernet physical layer interface chip due to the increase of the turn-off impedance when the field effect tube MOSFET is turned off. That is, after using the field effect tube MOSFET as a switch in the present embodiment, only one power supply chip is needed, and its circuit cost is much lower than that of two power supply chips, which reduces the cost of realizing the Ethernet wake-up function. At the same time, the present embodiment uses capacitor C1 to adjust the gate and source voltage difference formation time of the field effect tube MOSFET, and then adjusts the opening time of the field effect tube MOSFET, which can adapt to the requirements of different Ethernet physical layer interface chips for the power-on slope of the 3.3V input that is not powered off when in sleep. In addition, the present embodiment uses capacitor C2 to compensate for the problem that the demand current of the 3.3V input of the Ethernet interface chip that is powered off when in sleep is rapidly reduced during the shutdown process of the field effect tube Q1, causing this 3.3V cannot be stably powered off. Therefore, the present embodiment provides a low-cost, high-reliability power supply circuit for realizing the Ethernet wake-up function of the Ethernet physical layer interface chip.

[0049] In summary, the utility model provides a power supply circuit, which forms a power supply module with a switch function by using resistors, capacitors and field effect transistors. The switch can be turned on when the load is working, and the switch can be turned off when the load is dormant, so that the power module can realize the effect of powering off when the load is dormant and powering when working. At the same time, compared with the existing power supply scheme that directly uses two power supply chips as two power supply inputs, the power supply circuit of the utility model only needs to use one power supply chip as one of the power supply inputs, and then replace the other power supply chip with a power supply module formed by resistors, capacitors and field effect transistors as the other power supply input, and the load does not need to be adjusted when the load is powered. Moreover, since the total cost of resistors, capacitors and field effect transistors is much lower than the cost of power supply chips, the power supply circuit of the utility model can reduce the power supply cost of the load. For example, when the load is an Ethernet physical layer interface chip, the power supply circuit of the utility model can reduce the power supply cost when realizing the Ethernet wake-up function. Therefore, compared with the existing power supply scheme, the power supply cost of the power supply circuit of the utility model is much lower than the existing scheme.

[0050] In another exemplary embodiment of the present invention, the embodiment further provides an Ethernet physical layer interface circuit module, such as Figure 4 As shown, Figure 4 The hardware structure diagram of the Ethernet physical layer interface circuit module provided in this embodiment is shown. The Ethernet physical layer interface circuit module 200 includes:

[0051] Ethernet physical layer interface chip;

[0052] A first power supply module is used to provide a power supply voltage, and the power supply voltage is connected to the Ethernet physical layer interface chip;

[0053] The second power supply module comprises a switch, wherein an input end of the switch is connected to a power supply voltage, a control end of the switch is connected to a switch control input signal, and an output end of the switch is connected to an Ethernet physical layer interface chip;

[0054] When the Ethernet physical layer interface chip is dormant, the switch control input signal is in the first state and the switch is turned off; when the Ethernet physical layer interface chip is working, the switch control input signal is in the second state and the switch is turned on.

[0055] According to the above records, the switch in this embodiment is a field effect transistor MOSFET, and the first state and the second state of the switch control input signal are determined by the channel type of the field effect transistor MOSFET. Among them, the channel types of the field effect transistor MOSFET include: P channel type and N channel type. That is, the switch in the above embodiment can be a P channel field effect transistor MOSFET, or an N channel field effect transistor MOSFET. As an example, if the switch is a P channel field effect transistor MOSFET, the first state of the switch control input signal is to output a low level signal, and the second state of the switch control input signal is to release the low level and output a high level signal. In this embodiment, the high level is relatively high in voltage compared to the low level.

[0056] According to the above records, in an exemplary embodiment, the second power supply module also includes: a first resistor, a second resistor, a first capacitor, and a second capacitor. Among them, the input end of the field effect tube is respectively connected to the supply voltage, the first end of the first resistor and the first end of the first capacitor; the control end of the field effect tube is respectively connected to the second end of the first resistor, the second end of the first capacitor and the first end of the second resistor; the output end of the field effect tube is respectively connected to the load and the first end of the second capacitor; the second end of the second resistor is connected to the switch control input signal, and the second end of the second capacitor is grounded. In this embodiment, the resistance values ​​of the first resistor and the second resistor are determined by the channel type of the field effect tube; the capacitance value of the first capacitor is determined by the resistance value of the second resistor and the load; the capacitance value of the second capacitor is determined by the resistance value of the first resistor, the capacitance value of the first capacitor and the load; the first power supply module is composed of a voltage regulator.

[0057] According to the above records, as an example, Figure 5 As shown, Figure 5 FIG. 1 shows a circuit connection diagram of the Ethernet physical layer interface circuit module provided in this embodiment. Specifically,

[0058] The first power supply module is composed of an LDO chip and is used to provide a 3.3V power supply for the Ethernet physical layer interface chip.

[0059] The second power supply module includes a capacitor C1, a resistor R1, a resistor R2, a field effect transistor Q1 and a capacitor C2; wherein the source of the field effect transistor Q1 is connected as an input end to the power supply voltage, the first end of the resistor R1 and the first end of the capacitor C1 respectively; the gate of the field effect transistor Q1 is connected as a control end to the second end of the resistor R1, the second end of the capacitor C1 and the first end of the resistor R2 respectively; the drain of the field effect transistor Q1 is connected as an output end to the Ethernet physical layer interface chip and the first end of the capacitor C2 respectively; the second end of the resistor R2 is connected to the switch control input signal, and the second end of the capacitor C2 is grounded.

[0060] The implementation process of the Ethernet physical layer interface circuit module in this embodiment can be: when the Ethernet physical layer interface chip works normally, the switch controls the input signal to output a low-level signal, and after the capacitor C1 is fully charged through the resistor R2, the resistors R1 and R2 form a voltage divider, so that the gate and source of the field effect transistor Q1 produce a voltage difference, and the field effect transistor Q1 is turned on. When the Ethernet physical layer interface chip is dormant, the switch controls the input signal to release the low level and output a high-level signal, the capacitor C1 is discharged through the resistor R1, the voltage difference between the two ends of the resistor R1 disappears, and the field effect transistor Q1 is turned off.

[0061] According to the above records, in this embodiment, Figure 5 The field effect transistor Q1 in the controller is a P-channel field effect transistor, which is used to shut down part of the 3.3V power output of the LDO chip when the controller is in sleep mode, and to supply power to the 3.3V input of the Ethernet physical layer interface chip that is powered off when in sleep mode. Resistors R1 and R2 are used to provide bias voltage for turning on the field effect transistor Q1, and their actual values ​​are determined by the actual model of the field effect transistor Q1. Capacitor C1 is used to extend the turn-on time of the field effect transistor Q1, and its actual value is determined by the resistance value of resistor R2 and the model of the Ethernet physical layer interface chip. Capacitor C2 is used to provide short-term supplementary power supply for the Ethernet physical layer interface chip when the power is off during the shutdown process of the field effect transistor Q1, and its actual value is determined by the resistance value of resistor R1, the capacitance of capacitor C1, and the model of the Ethernet physical layer interface chip. The switch control input signal is an external input signal, which is used to provide drive for turning on the field effect transistor Q1.

[0062] In summary, the utility model provides an Ethernet physical layer interface circuit module, which forms a power supply module with a switch function by using resistors, capacitors and field effect transistors. The switch can be turned on when the Ethernet physical layer interface chip is working, and the switch can be turned off when the Ethernet physical layer interface chip is dormant, so that the Ethernet physical layer interface chip is powered off when it is dormant and powered on when it is working. At the same time, compared with the existing interface chip power supply scheme that directly uses two power supply chips as two power supply inputs, the Ethernet physical layer interface circuit module of the utility model only needs to use one power supply chip as one of the power supply inputs, and then replace the other power supply chip with a power supply module formed by resistors, capacitors and field effect transistors as another power supply input. When the Ethernet physical layer interface chip is powered, it is not necessary to adjust the Ethernet physical layer interface chip. Moreover, since the total cost of resistors, capacitors and field effect transistors is much lower than the cost of power supply chips, the Ethernet physical layer interface circuit module of the utility model can reduce the power supply cost of the Ethernet physical layer interface chip. Therefore, compared with the existing interface chip power supply scheme, the power supply cost of the Ethernet physical layer interface circuit module of the utility model is much lower than the existing scheme.

[0063] It should be noted that the Ethernet physical layer interface circuit module provided in the above embodiment and the power supply circuit provided in the above embodiment belong to the same concept, wherein the specific manner in which each module of the power supply circuit performs operations has been described in detail in the above embodiment, so the technical effects corresponding to the Ethernet physical layer interface circuit module in this embodiment are not repeated here. In actual applications, the Ethernet physical layer interface circuit module provided in this embodiment can allocate the above functions to different functional modules as needed, that is, divide the internal structure of the Ethernet physical layer interface circuit module into different functional modules, so as to realize all or part of the functions through the power supply circuit described in the above embodiment, and this is not limited here.

[0064] In another exemplary embodiment of the utility model, the embodiment further provides a power supply chip, which includes a power supply circuit as in any of the above embodiments. It should be noted that the power supply chip provided in this embodiment and the power supply circuit provided in the above embodiments belong to the same concept, wherein the specific manner in which each module of the power supply circuit performs operations has been described in detail in the above embodiments, so the specific implementation process of the power supply chip in this embodiment and the corresponding technical effects are no longer repeated here. In actual applications, the power supply chip provided in this embodiment can distribute the above functions to different functional modules as needed, that is, divide the internal structure of the power supply chip into different functional modules, so as to realize all or part of the functions through the power supply circuit described in the above embodiments, and this is not limited here.

[0065] In another exemplary embodiment of the utility model, the embodiment also provides a vehicle, which includes a power supply chip as described in the above embodiment. It should be noted that the vehicle provided in this embodiment belongs to the same concept as the power supply chip provided in the above embodiment, and the power supply chip and the power supply circuit provided in the above embodiment belong to the same concept. Therefore, the vehicle in this embodiment belongs to the application scenario of the power supply circuit in the above embodiment. The specific way in which each module of the power supply circuit performs operations has been described in detail in the above embodiment, so the specific implementation process and corresponding technical effects of the power supply chip in this embodiment will not be repeated here. In actual application, the vehicle provided in this embodiment can allocate the above functions to different functional modules as needed, that is, divide the internal structure of the vehicle into different functional modules, so as to realize all or part of the functions through the power supply chip described in the above embodiment, and this is not limited here.

[0066] It should be understood that, although the terms first, second, etc. may be used to describe power modules, etc. in the embodiments of the present invention, these power modules should not be limited to these terms. These terms are only used to distinguish power modules from each other. For example, without departing from the scope of the embodiments of the present invention, the first power module may also be referred to as the second power module, and similarly, the second power module may also be referred to as the first power module.

[0067] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A power supply circuit, characterized in that: Included are: A first power supply module, used for providing a power supply voltage; A second power supply module comprises a switch, wherein an input terminal of the switch is connected to the supply voltage, a control terminal of the switch is connected to a switch control input signal, an output terminal of the switch is connected to a load, and the load is also connected to the supply voltage; Wherein, when the load is dormant, the switch control input signal is in the first state, and the switch is turned off; When the load is working, the switch control input signal is in the second state, and the switch is turned on.

2. The power supply circuit according to claim 1, characterized in that: The switch is a field effect transistor, and the first state and the second state of the switch controlling the input signal are determined by the channel type of the field effect transistor.

3. The power supply circuit according to claim 2, characterized in that: The second power supply module further includes: a first resistor, a second resistor, a first capacitor, and a second capacitor; The input end of the field effect tube is respectively connected to the supply voltage, the first end of the first resistor and the first end of the first capacitor; The control end of the field effect tube is respectively connected to the second end of the first resistor, the second end of the first capacitor and the first end of the second resistor; The output end of the field effect tube is connected to the load and the first end of the second capacitor respectively; A second end of the second resistor is connected to the switch control input signal, and a second end of the second capacitor is grounded.

4. The power supply circuit according to claim 3, characterized in that: The resistance values ​​of the first resistor and the second resistor are determined by the channel type of the field effect transistor.

5. The power supply circuit according to claim 3, characterized in that: The capacitance value of the first capacitor is determined by the resistance value of the second resistor and the load.

6. The power supply circuit according to claim 3, characterized in that: The capacitance value of the second capacitor is determined by the resistance value of the first resistor, the capacitance value of the first capacitor and the load.

7. The power supply circuit according to any one of claims 2 to 6, characterized in that: The field effect transistor is a P-channel field effect transistor, and the first power supply module is composed of a voltage stabilizer.

8. A power supply chip, characterized in that: The power supply chip includes the power supply circuit as claimed in any one of claims 1 to 7.

9. A vehicle, characterized in that: The vehicle includes the power supply chip as claimed in claim 8.

10. An Ethernet physical layer interface circuit module, characterized in that: Included are: Ethernet physical layer interface chip; A first power supply module, used for providing a power supply voltage, and the power supply voltage is connected to the Ethernet physical layer interface chip; A second power supply module comprises a switch, wherein an input terminal of the switch is connected to the supply voltage, a control terminal of the switch is connected to a switch control input signal, and an output terminal of the switch is connected to the Ethernet physical layer interface chip; Wherein, when the Ethernet physical layer interface chip is in sleep mode, the switch control input signal is in the first state, and the switch is turned off; When the Ethernet physical layer interface chip is working, the switch control input signal is in the second state, and the switch is turned on.

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