Intra-chip power supply circuit

Abstract

Disclosed in the embodiments of the present application is an intra-chip power supply circuit. A current generation circuit in the intra-chip power supply circuit provides a basis for the operation of a main power supply circuit and the operation of an auxiliary power supply circuit, a tenth end of the auxiliary power supply circuit can be connected to a chip external power source, and when a chip power supply source is connected and the chip external power source is not connected, the main power supply circuit stabilizes the voltage of an output end to be at a first preset value; and after the chip external power source is connected to the circuit, if the connected chip external power source is powerful, the auxiliary power supply circuit can output, under the operation of a protection circuit, a voltage equal to a voltage value of the chip external power source. In this way, when a first preset value can meet the requirements for a voltage magnitude, a current capacity, etc., the stable voltage output of an output end can be realized only by connecting a chip power supply source; and when the first preset value cannot meet the requirements, a chip external power source is designed to have a required voltage value, so as to be applicable to switch power source circuits in multiple scenarios.

Description

A chip internal power supply circuit

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 29, 2024, with application number 202410225201.5 and invention name “A chip internal power supply circuit with multi-voltage input”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of power supply circuits, and in particular to a power supply circuit inside a chip. Background Art

[0003] The switching power supply circuit in the prior art generally includes a power circuit and an integrated circuit control chip. The supply voltage or reference voltage of each module inside the integrated circuit control chip is generally directly generated by the power supply circuit inside the chip.

[0004] However, the internal power supply circuit of the chip in the prior art usually has only one input voltage and can only generate a fixed output voltage. When the chip is used in a switching power supply circuit in different application scenarios, each module inside the chip requires a different power supply voltage or reference voltage. Therefore, the internal voltage generation circuit of the chip in the prior art cannot be applied to the switching power supply circuit in multiple scenarios. Summary of the Invention

[0005] In view of this, an embodiment of the present application provides an internal chip power supply circuit to solve the technical problem in the prior art that the internal chip voltage generation circuit cannot be applied to the switching power supply circuit in multiple scenarios.

[0006] The technical solutions provided in the embodiments of this application are as follows:

[0007] A first aspect of an embodiment of the present application provides a chip internal power supply circuit, comprising: a current generating circuit, a main power supply circuit, an auxiliary power supply circuit, and a protection circuit;

[0008] A first end of the current generating circuit is connected to the chip power supply, a second end of the current generating circuit is grounded, a third end of the current generating circuit is connected to the first end of the main power supply circuit and the first end of the auxiliary power supply circuit, and a fourth end of the current generating circuit is connected to the second end of the auxiliary power supply circuit. The current generating circuit is configured to conduct according to the voltage provided by the chip power supply after the chip power supply is connected;

[0009] The second end of the main power supply circuit is connected to the chip power supply, the third end of the main power supply circuit is grounded, the fourth end of the main power supply circuit is connected to the first end of the protection circuit, the fifth end of the main power supply circuit is connected to the second end of the protection circuit, the sixth end of the main power supply circuit is connected to the third end of the protection circuit, the seventh end of the main power supply circuit is connected to the fourth end of the auxiliary power supply circuit, the eighth end of the main power supply circuit is connected to the fifth end of the auxiliary power supply circuit, the ninth end of the main power supply circuit is connected to the sixth end of the auxiliary power supply circuit and the output end, the tenth end of the main power supply circuit is connected to the first reference voltage, and the eleventh end of the main power supply circuit is connected to the second reference voltage and the seventh end of the auxiliary power supply circuit;

[0010] The third terminal of the auxiliary power supply circuit is connected to the fourth terminal of the protection circuit, the eighth terminal of the auxiliary power supply circuit is connected to the chip power supply, the ninth terminal of the auxiliary power supply circuit is grounded, the tenth terminal of the auxiliary power supply circuit is connected to the chip external power supply, the first terminal and the third terminal of the protection circuit are connected, the fifth terminal of the protection circuit is connected to the chip power supply, and the protection circuit operates according to the voltage provided by the chip power supply;

[0011] When the chip power supply is connected and the chip external power supply is not connected, the main power supply circuit is turned on according to the voltage provided by the chip power supply and the current generating circuit is turned on, and the auxiliary power supply circuit is turned off according to the turned-on main power supply circuit, and the main power supply circuit stabilizes the voltage at the output end at a first preset value;

[0012] When both the chip power supply and the chip external power supply are connected, if the voltage of the chip external power supply multiplied by a preset multiple is greater than the second reference voltage, the main power supply circuit is shut down according to the increased current in the auxiliary power supply circuit, and the auxiliary power supply circuit stabilizes the output terminal voltage to a second preset value under the operation of the protection circuit, and the second preset value is equal to the voltage of the chip external power supply;

[0013] When both the chip power supply and the chip external power supply are connected, if the voltage of the chip external power supply multiplied by a preset multiple is lower than the second reference voltage, the main power supply circuit is turned on and operated according to the voltage provided by the chip power supply and the current generating circuit that is turned on and operated, and the auxiliary power supply circuit is turned on and operated according to the voltage provided by the chip external power supply and the current generating circuit that is turned on and operated, the current in the auxiliary power supply circuit is less than the current in the main power supply circuit, and the main power supply circuit stabilizes the voltage at the output end at the first preset value;

[0014] The protection circuit is used to control the voltage of components in the main power supply circuit when the main power supply circuit is turned on to protect the components in the main power supply circuit.

[0015] In an optional embodiment, the current generating circuit includes: a second current source, a seventh resistor, an eleventh controllable current source and a twelfth controllable current source, one end of the second current source is connected to the chip power supply, the other end of the second current source is connected to one end of the seventh resistor, the positive control end of the eleventh controllable current source and the positive control end of the twelfth controllable current source, the other end of the seventh resistor is connected to the negative control end and the output end of the eleventh controllable current source, the negative control end and the output end of the twelfth controllable current source and are grounded, the input end of the eleventh controllable current source is connected to the second end of the auxiliary power supply circuit, and the input end of the twelfth controllable current source is connected to the first end of the main power supply circuit and the first end of the auxiliary power supply circuit.

[0016] In an optional embodiment, the main power supply circuit includes: a first resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, an eighth resistor, a first controllable current source, a second controllable current source, a third controllable current source, a fourth controllable current source, a seventh controllable current source, an eighth controllable current source, a ninth controllable current source, a tenth controllable current source, a thirteenth controllable current source, a first current source, a first switching tube, a second switching tube, an eighth switching tube, and a tenth switching tube;

[0017] One end of the first resistor is connected to the positive control terminal and input end of the first controllable current source, the positive control terminal and input end of the second controllable current source, the positive control terminal and input end of the third controllable current source, the positive control terminal and input end of the fourth controllable current source, the first end of the tenth switch tube, the first end of the first current source, and the chip power supply; the other end of the first resistor is connected to the negative control terminal of the first controllable current source, the output end of the second controllable current source, the output end of the third controllable current source, the output end of the fourth controllable current source, the fifth end of the auxiliary power supply circuit, and the first end of the eighth switch tube; the second end of the tenth switch tube is connected to the second end of the first current source and the first end of the protection circuit; the third end of the tenth switch tube is connected to one end of the fifth resistor, the sixth end, and the output end of the auxiliary power supply circuit; the second end of the eighth switch tube is connected to the third end of the current generating circuit and the first end of the auxiliary power supply circuit; and the third end of the eighth switch tube is connected to the second reference voltage and the seventh end of the auxiliary power supply circuit;

[0018] The output end of the first controllable current source is connected to one end of the third resistor, the positive control end of the seventh controllable current source, and the positive control end of the eighth controllable current source. The other end of the third resistor is connected to the negative control end of the seventh controllable current source, the negative control end of the eighth controllable current source G8, one end of the fourth resistor, the first end of the second switch tube, the positive control end of the ninth controllable current source, and the positive control end of the tenth controllable current source. The other end of the fourth resistor is connected to the negative control end and the output end of the ninth controllable current source, the negative control end and the output end of the tenth controllable current source, and is grounded. The input end of the eighth controllable current source is connected to the third end of the protection circuit. The input end of the ninth controllable current source is connected to the output end of the seventh controllable current source and the first end of the first switch tube.

[0019] The output end of the second controllable current source is connected to the second end of the first switching tube and the second end of the second switching tube, the third end of the first switching tube is connected to the first reference voltage, the third end of the second switching tube is connected to the other end of the fifth resistor and one end of the sixth resistor, the other end of the sixth resistor is grounded, the output end of the third controllable current source is connected to the input end of the seventh controllable current source and the second end of the protection circuit, the output end of the fourth controllable current source is connected to one end of the eighth resistor and the positive control end of the thirteenth controllable current source, the other end of the eighth resistor is connected to the negative control end and the output end of the thirteenth controllable current source and is grounded, and the input end of the thirteenth controllable current source is connected to the fourth end of the auxiliary power supply circuit.

[0020] In an optional embodiment, the auxiliary power supply circuit includes: a second resistor, a ninth resistor, a tenth resistor, a fifth controllable current source, a sixth controllable current source, a first inverter, a sixth switch tube, a seventh switch tube, a ninth switch tube, and an eleventh switch tube;

[0021] One end of the second resistor is connected to the positive control terminal and input terminal of the fifth controllable current source, the positive control terminal and input terminal of the sixth controllable current source, and the chip power supply; the other end of the second resistor is connected to the negative control terminal of the fifth controllable current source, the negative control terminal of the sixth controllable current source, and the first end of the ninth switch tube; the output end of the fifth controllable current source is connected to the eighth end of the main power supply circuit; the output end of the sixth controllable current source is connected to the seventh end of the main power supply circuit, one end of the first inverter, and the first end of the seventh switch tube; the second end of the seventh switch tube is connected to the ninth end and output end of the main power supply circuit; and the third end of the seventh switch tube is connected to the first end of the sixth switch tube and the fourth end of the current generating circuit;

[0022] The second end of the sixth switch tube is connected to the second reference voltage and the eleventh end of the main power supply circuit, the third end of the sixth switch tube is connected to the fourth end of the protection circuit, the second end of the ninth switch tube is connected to the third end of the current generating circuit and the first end of the main power supply circuit, the third end of the ninth switch tube is connected to one end of the ninth resistor and one end of the tenth resistor, the other end of the tenth resistor is grounded, the other end of the ninth resistor is connected to the chip external power supply and the first end of the eleventh switch tube, the second end of the eleventh switch tube is connected to the other end of the first inverter, and the third end of the eleventh switch tube is connected to the ninth end of the main power supply circuit and the output end.

[0023] In an optional embodiment, the protection circuit includes: a third current source, a first voltage-stabilizing diode, a third switch tube, a fourth switch tube and a fifth switch tube, one end of the third current source is connected to the negative electrode of the first voltage-stabilizing diode, the first end of the third switch tube, the first end of the fourth switch tube, the first end of the fifth switch tube and the chip power supply, the other end of the third current source is connected to the second end of the fourth switch tube, the second end of the fifth switch tube, the positive electrode of the first voltage-stabilizing diode and the third end of the auxiliary power supply circuit, the third end of the fourth switch tube is connected to the second end of the third switch tube, the fourth end of the main power supply circuit and the sixth end of the main power supply circuit, and the third end of the fifth switch tube is connected to the third end of the third switch tube and the fifth end of the main power supply circuit.

[0024] In an optional implementation, the first preset value is expressed using the following formula:

[0025] Wherein, VREF1 represents the first reference voltage, R5 represents the resistance value of the fifth resistor, and R6 represents the resistance value of the sixth resistor. In an optional embodiment, the preset multiple is equal to:

[0026] Wherein, R9 represents the resistance value of the ninth resistor, and R10 represents the resistance value of the tenth resistor.

[0027] A second aspect of an embodiment of the present application provides an integrated circuit control chip, comprising: the first aspect of the embodiment of the present application and the chip internal power supply circuit of any one of the first aspects.

[0028] A third aspect of an embodiment of the present application provides a switching power supply circuit, including: an integrated circuit control chip according to the second aspect of an embodiment of the present application.

[0029] In an optional embodiment, the switching power supply circuit is used to charge the battery.

[0030] The technical solution of this application has the following advantages:

[0031] The chip internal power supply circuit provided in the embodiment of the present application is provided with a current generating circuit, a main power supply circuit, an auxiliary power supply circuit and a protection circuit. The current generating circuit provides the basis for the operation of the main power supply circuit and the auxiliary power supply circuit. The tenth terminal of the auxiliary power supply circuit can be connected to the chip external power supply. When the chip power supply is connected and the chip external power supply is not connected, the main power supply circuit stabilizes the voltage of the output end at a first preset value; when the current generating circuit is turned on and the chip external power supply is connected to the circuit, if the connected chip external power supply is large, the auxiliary power supply circuit can output a voltage of a second preset value equal to the voltage value of the chip external power supply under the operation of the protection circuit. Therefore, when the first preset value can meet the requirements of voltage size and current capacity, only the chip power supply can be connected to achieve a stable voltage output of the first preset value at the output end of the circuit; when the first preset value cannot meet the requirements, the chip external power supply can be connected on the basis of the chip power supply, and the chip external power supply can be designed to the required voltage value, so that the chip internal power supply circuit can output the required voltage, thereby being suitable for switching power supply circuits in multiple scenarios.

[0032] The chip internal power supply circuit provided in this embodiment, when the current generating circuit is turned on and the chip external power supply is connected to the circuit, if the connected chip external power supply is small, the circuit output maintains the working state before the chip external power supply is not connected, thereby preventing the auxiliary circuit from being triggered incorrectly.

[0033] The chip internal power supply circuit provided in this embodiment is provided with a protection circuit, which can control the voltage of components in the main power supply circuit, thereby achieving protection of the components in the main power supply circuit.

[0034] The switching power supply circuit provided in this embodiment includes an integrated circuit control chip with an internal power supply circuit. In different application scenarios, the chip's external power supply can be set to a required voltage value, so that the internal power supply circuit can output the required voltage value based on the chip's external power supply. Thus, the switching power supply circuit can meet the requirements of switching power supply circuits in different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] FIG1 is a block diagram of a chip internal power supply circuit according to an embodiment of the present application;

[0037] FIG2 is a schematic diagram of the structure of the internal power supply circuit of the chip in an embodiment of the present application;

[0038] FIG3 is a block diagram of the structure of an integrated circuit control chip according to an embodiment of the present application;

[0039] FIG4 is a structural block diagram of a switching power supply circuit in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal connections between two components; they can refer to wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0043] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0044] An embodiment of the present application provides an internal power supply circuit of a chip. As shown in FIG1 , the internal power supply circuit of the chip includes: a current generating circuit 100 , a main power supply circuit 200 , an auxiliary power supply circuit 300 and a protection circuit 400 .

[0045] A first end of the current generating circuit 100 is connected to the chip power supply VIN, a second end of the current generating circuit 100 is grounded, a third end of the current generating circuit 100 is connected to a first end of the main power supply circuit 200 and a first end of the auxiliary power supply circuit 300, and a fourth end of the current generating circuit 100 is connected to a second end of the auxiliary power supply circuit 300. The current generating circuit 100 is configured to be turned on and operated according to the voltage provided by the chip power supply VIN after the chip power supply VIN is connected.

[0046] A second terminal of the main power supply circuit 200 is connected to the chip power supply VIN, a third terminal of the main power supply circuit 200 is grounded, a fourth terminal of the main power supply circuit 200 is connected to the first terminal of the protection circuit 400, a fifth terminal of the main power supply circuit 200 is connected to the second terminal of the protection circuit 400, a sixth terminal of the main power supply circuit 200 is connected to the third terminal of the protection circuit 400, a seventh terminal of the main power supply circuit 200 is connected to the fourth terminal of the auxiliary power supply circuit 300, an eighth terminal of the main power supply circuit 200 is connected to the fifth terminal of the auxiliary power supply circuit 300, a ninth terminal of the main power supply circuit 200 is connected to the sixth terminal and the output terminal of the auxiliary power supply circuit 300, a tenth terminal of the main power supply circuit 200 is connected to the first reference voltage VREF1, and an eleventh terminal of the main power supply circuit 200 is connected to the second reference voltage VREF2 and the seventh terminal of the auxiliary power supply circuit 300;

[0047] The third terminal of the auxiliary power supply circuit 300 is connected to the fourth terminal of the protection circuit 400, the eighth terminal of the auxiliary power supply circuit 300 is connected to the chip power supply VIN, the ninth terminal of the auxiliary power supply circuit 300 is grounded, and the tenth terminal of the auxiliary power supply circuit 300 is connected to the chip external power supply EVIN. The first terminal and the third terminal of the protection circuit 400 are connected, and the fifth terminal of the protection circuit 400 is connected to the chip power supply VIN. The protection circuit 400 operates according to the voltage provided by the chip power supply VIN.

[0048] When the chip power supply is connected and the chip external power supply is not connected, the main power supply circuit is turned on according to the voltage provided by the chip power supply and the current generating circuit is turned on, and the auxiliary power supply circuit is turned off according to the main power supply circuit being turned on. The main power supply circuit stabilizes the voltage at the output end at a first preset value.

[0049] When both the chip power supply VIN and the chip external power supply EVIN are connected, if the voltage of the chip external power supply EVIN multiplied by a preset multiple is lower than the second reference voltage VREF2, the main power supply circuit 200 is turned on based on the voltage provided by the chip power supply VIN and the current generating circuit 100 is turned on, and the auxiliary power supply circuit 300 is turned on based on the voltage provided by the chip external power supply EVIN and the current generating circuit 100 is turned on. The current in the auxiliary power supply circuit 300 is lower than the current in the main power supply circuit 200, and the main power supply circuit 200 stabilizes the voltage at the output end at the first preset value.

[0050] When both the chip power supply VIN and the chip external power supply EVIN are connected, if the voltage of the chip external power supply EVIN multiplied by a preset multiple is greater than the second reference voltage VREF2, the main power supply circuit 200 is shut down according to the increased current in the auxiliary power supply circuit 300. The auxiliary power supply circuit 300 stabilizes the output voltage at a second preset value under the operation of the protection circuit 400. The second preset value is equal to the voltage of the chip external power supply EVIN.

[0051] It should be noted that the chip's internal power supply circuit includes four voltage inputs: the chip power supply VIN, a first reference voltage VREF1, a second reference voltage VREF2, and an external chip power supply EVIN. The first reference voltage VREF1 and the second reference voltage VREF2 can be equal or different, and both are generated by the chip power supply VIN. Both the first reference voltage VREF1 and the second reference voltage VREF2 are lower than the voltage of the chip power supply VIN.

[0052] The chip internal power supply circuit provided in this embodiment is provided with a current generating circuit, a main power supply circuit, an auxiliary power supply circuit and a protection circuit. The current generating circuit provides a basis for the operation of the main power supply circuit and the auxiliary power supply circuit. The tenth terminal of the auxiliary power supply circuit can be connected to the chip external power supply. When the chip power supply is connected and the chip external power supply is not connected, the main power supply circuit stabilizes the voltage at the output end at a first preset value; when the current generating circuit is turned on and the chip external power supply is connected to the circuit, if the connected chip external power supply is small, the circuit output maintains the previous working state at this time to prevent the auxiliary circuit from being triggered incorrectly; when the connected chip external power supply is large, the auxiliary power supply circuit can output a voltage of a second preset value equal to the voltage value of the chip external power supply under the operation of the protection circuit. Therefore, when the first preset value can meet the requirements such as voltage size and current capacity, only the chip power supply needs to be connected to achieve a stable voltage output of the first preset value at the circuit output end; when the first preset value cannot meet the requirements, the chip external power supply can be connected on the basis of the chip power supply, and the chip external power supply can be designed to the required voltage value, so that the internal power supply circuit of the chip can output the required voltage, which is suitable for switching power supply circuits in multiple scenarios.

[0053] In an optional embodiment, the current generating circuit includes: a second current source I2, a seventh resistor R7, an eleventh controllable current source G11 and a twelfth controllable current source G12, one end of the second current source I2 is connected to the chip power supply VIN, the other end of the second current source I2 is connected to one end of the seventh resistor R7, the positive control end of the eleventh controllable current source G11 and the positive control end of the twelfth controllable current source G12, the other end of the seventh resistor R7 is connected to the negative control end and output end of the eleventh controllable current source G11, the negative control end and output end of the twelfth controllable current source G12 and are grounded, the input end of the eleventh controllable current source G11 is connected to the second end of the auxiliary power supply circuit, and the input end of the twelfth controllable current source G12 is connected to the first end of the main power supply circuit and the first end of the auxiliary power supply circuit.

[0054] Specifically, when the chip power supply is connected to the circuit, current is generated in the second current source I2, and the current flows into the seventh resistor R7, generating a voltage drop across the seventh resistor R7. Therefore, at this time, current is generated in both the eleventh controllable current source G11 and the twelfth controllable current source G12, thereby turning on the current generating circuit.

[0055] In an optional embodiment, the main power supply circuit 200 includes: a first resistor R1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, an eighth resistor R8, a first controllable current source G1, a second controllable current source G2, a third controllable current source G3, a fourth controllable current source G4, a seventh controllable current source G7, an eighth controllable current source G8, a ninth controllable current source G9, a tenth controllable current source G10, a thirteenth controllable current source G13, a first current source I1, a first switch tube M1, a second switch tube M2, an eighth switch tube M8 and a tenth switch tube M10.

[0056] One end of the first resistor R1 is connected to the positive control terminal and input end of the first controllable current source G1, the positive control terminal and input end of the second controllable current source G2, the positive control terminal and input end of the third controllable current source G3, the positive control terminal and input end of the fourth controllable current source G4, the first end of the tenth switch tube M10, the first end of the first current source I1 and the chip power supply VIN, and the other end of the first resistor R1 is connected to the negative control terminal of the first controllable current source G1, the output end of the second controllable current source G2, the output end of the third controllable current source G3, and the output end of the fourth controllable current source G4. , a fifth terminal of the auxiliary power supply circuit 300 and a first terminal of the eighth switch tube M8, a second terminal of the tenth switch tube M10 is connected to the second terminal of the first current source I1 and the first terminal of the protection circuit 400, a third terminal of the tenth switch tube M10 is connected to one end of the fifth resistor R5, the sixth terminal of the auxiliary power supply circuit 300, and the output terminal, a second end of the eighth switch tube M8 is connected to the third terminal of the current generating circuit 100 and the first terminal of the auxiliary power supply circuit 300, and a third terminal of the eighth switch tube M8 is connected to the second reference voltage VREF2 and the seventh terminal of the auxiliary power supply circuit 300.

[0057] The output end of the first controllable current source G1 is connected to one end of the third resistor R3, the positive control end of the seventh controllable current source G7, and the positive control end of the eighth controllable current source G8. The other end of the third resistor R3 is connected to the negative control end of the seventh controllable current source G7, the negative control end of the eighth controllable current source G8, one end of the fourth resistor R4, the first end of the second switch tube M2, the positive control end of the ninth controllable current source G9, and the positive control end of the tenth controllable current source G10. The other end of the fourth resistor R4 is connected to the negative control end and output end of the ninth controllable current source G9, the negative control end and output end of the tenth controllable current source G10, and grounded. The input end of the eighth controllable current source G8 is connected to the third end of the protection circuit 400. The input end of the ninth controllable current source G9 is connected to the output end of the seventh controllable current source G7 and the first end of the first switch tube M1.

[0058] The output end of the second controllable current source G2 is connected to the second end of the first switching tube M1 and the second end of the second switching tube M2. The third end of the first switching tube M1 is connected to the first reference voltage VREF1. The third end of the second switching tube M2 is connected to the other end of the fifth resistor R5 and one end of the sixth resistor R6. The other end of the sixth resistor R6 is grounded. The output end of the third controllable current source G3 is connected to the input end of the seventh controllable current source G7 and the second end of the protection circuit 400. The output end of the fourth controllable current source G4 is connected to one end of the eighth resistor R8 and the positive control end of the thirteenth controllable current source G13. The other end of the eighth resistor R8 is connected to the negative control end and the output end of the thirteenth controllable current source G13 and is grounded. The input end of the thirteenth controllable current source G13 is connected to the fourth end of the auxiliary power supply circuit 300.

[0059] The auxiliary power supply circuit 300 includes a second resistor R2, a ninth resistor R9, a tenth resistor R10, a fifth controllable current source G5, a sixth controllable current source G6, a first inverter A1, a sixth switch M6, a seventh switch M7, a ninth switch M9 and an eleventh switch M11.

[0060] One end of the second resistor R2 is connected to the positive control terminal and input terminal of the fifth controllable current source G5, the positive control terminal and input terminal of the sixth controllable current source G6, and the chip power supply VIN. The other end of the second resistor R2 is connected to the negative control terminal of the fifth controllable current source G5, the negative control terminal of the sixth controllable current source G6, and the first end of the ninth switch tube M9. The output end of the fifth controllable current source G5 is connected to the eighth terminal of the main power supply circuit 200. The output end of the sixth controllable current source G6 is connected to the seventh terminal of the main power supply circuit 200, one end of the first inverter A1, and the first end of the seventh switch tube M7. The second end of the seventh switch tube M7 is connected to the ninth terminal and output terminal of the main power supply circuit 200. The third end of the seventh switch tube M7 is connected to the first end of the sixth switch tube M6 and the fourth end of the current generating circuit 100.

[0061] A second end of the sixth switch tube M6 is connected to the second reference voltage VREF2 and the eleventh end of the main power supply circuit 200. A third end of the sixth switch tube M6 is connected to the fourth end of the protection circuit 400. A second end of the ninth switch tube M9 is connected to the third end of the current generating circuit 100 and the first end of the main power supply circuit 200. A third end of the ninth switch tube M9 is connected to one end of the ninth resistor R9 and one end of the tenth resistor R10. The other end of the tenth resistor R10 is grounded. The other end of the ninth resistor R9 is connected to the external chip power supply EVIN and the first end of the eleventh switch tube M11. A second end of the eleventh switch tube M11 is connected to the other end of the first inverter A1. A third end of the eleventh switch tube M11 is connected to the ninth end of the main power supply circuit 200 and the output end.

[0062] The protection circuit 400 includes: a third current source I3, a first voltage stabilizing diode D1, a third switching transistor M3, a fourth switching transistor M4, and a fifth switching transistor M5. One end of the third current source I3 is connected to the cathode of the first voltage stabilizing diode D1, the first end of the third switching transistor M3, the first end of the fourth switching transistor M4, the first end of the fifth switching transistor M5, and the chip power supply. The other end of the third current source I3 is connected to the second end of the fourth switching transistor M4, the second end of the fifth switching transistor M5, the anode of the first voltage stabilizing diode D1, and the third end of the auxiliary power supply circuit 300. The third end of the fourth switching transistor M4 is connected to the second end of the third switching transistor M3, the fourth end of the main power supply circuit 200, and the sixth end of the main power supply circuit 200. The third end of the fifth switching transistor M5 is connected to the third end of the third switching transistor M3 and the fifth end of the main power supply circuit 200.

[0063] Among them, when the chip power supply VIN is connected and the chip external power supply EVIN is not connected, the main power supply circuit 200 is turned on according to the voltage provided by the chip power supply VIN and the current generating circuit 100 and the protection circuit 400 are turned on, and the auxiliary power supply circuit 300 is turned off according to the main power supply circuit 200 being turned on, and the main power supply circuit 200 stabilizes the voltage at the output end at a first preset value.

[0064] Specifically, based on the above-mentioned structure of the main power supply circuit 200, the auxiliary power supply circuit 300, and the protection circuit 400, when the chip power supply is connected to the circuit and the chip external power supply is not connected to the circuit, a current is generated in the first current source I1. At this time, the first current source I1 pulls up the voltage at point D. That is, at this time, the voltage at the second terminal, i.e., the control terminal, of the tenth switch tube M10 is at a high level, and the tenth switch tube M10 is in the off state. Therefore, the output voltage VOUT at the E terminal (output terminal) is at a low level. In addition, as can be seen from the above description, the second reference voltage VREF2 is generated by the chip power supply. Therefore, when the chip power supply is connected to the circuit, the second reference voltage VREF2 can be obtained. Since the second end of the eighth switch tube M8, i.e., the current outflow end, is grounded through the twelfth controllable current source G12, after the second reference voltage VREF2 is connected and the twelfth controllable current source G12 is turned on, the eighth switch tube M8 is turned on, so that current flows through the first resistor R1, and a voltage drop is generated across the first resistor R1. Therefore, at this time, current is generated in the first controllable current source G1, the second controllable current source G2, the third controllable current source G3, and the fourth controllable current source G4; and the fourth controllable current source G4 is connected to the ground. The current generated by the controlled current source G4 flows into the eighth resistor R8, a voltage drop is generated across the eighth resistor R8, and the thirteenth controlled current source G13 generates a controlled current, which pulls down the voltage at point F. Therefore, at this time, the first end of the seventh switch tube M7, i.e., the control end voltage, is at a low level, and the second end of the eleventh switch tube M11, i.e., the control end voltage, is at a high level. Therefore, both the seventh switch tube M7 and the eleventh switch tube M11 are in the off state, i.e., at this time, the auxiliary power supply circuit 300 is in the off state. At the same time, the current generated by the first controlled current source G1 flows into the third resistor R3 and the fourth In the resistor R4, a voltage drop is generated across both ends of the third resistor R3 and the fourth resistor R4, and current is generated in the seventh controllable current source G7, the eighth controllable current source G8, the ninth controllable current source G9, and the tenth controllable current source G10. The current generated in the eighth controllable current source G8 and the tenth controllable current source G10 can be designed to be greater than the current generated in the first current source I1. Therefore, at this time, the eighth controllable current source G8 and the tenth controllable current source G10 pull down the voltage at point D, and the tenth switch tube M10 is turned on. Therefore, the output voltage VOUT of the output end is gradually pulled up by the chip power supply.

[0065] At the same time, after the chip power supply is connected to the circuit, the first reference voltage VREF1 can be obtained, and the gradually increased output voltage VOUT is divided by the fifth resistor R5 and the sixth resistor R6 to obtain the G point voltage VG.

[0066] When the voltage VG at point G is lower than the first reference voltage VREF1, the second terminal, i.e., the current input terminal, of the first switch tube M1 is connected to the second terminal, i.e., the current input terminal, of the second switch tube M2, and both the current input terminals of the first switch tube M1 and the second switch tube M2 are pulled up to the voltage of the chip power supply via the second controllable current source G2. Therefore, the voltage difference between the current input terminal and the third terminal, i.e., the control terminal, of the first switch tube M1 is smaller than the voltage difference between the current input terminal and the third terminal, i.e., the control terminal, of the second switch tube M2. Therefore, at this time, the current flowing from the first switch tube M1 into point A is smaller than the current flowing from the second switch tube M2 into point B. Furthermore, since the positive control terminal of the ninth controllable current source G9 cannot flow current, the current flowing from the second switch tube M2 into point B flows into the fourth resistor R4, increasing the voltage drop across the fourth resistor R4. Furthermore, due to the controllable current generated by the ninth controllable current source G9 and the voltage of the fourth resistor R4, the voltage drop between the first and second controllable current sources G9 and G9 is greater than the voltage drop between the first and second controllable current sources G9 and G9. The voltage drop forms a positive correlation of 1:1. Therefore, the increase in the controllable current flowing through the ninth controllable current source G9 is equal to the current flowing from the second switch tube M2 into point B. That is, at this time, the current flowing out of point A increases, and this increase is the current flowing from the second switch tube M2 into point B. Since the voltage drop across the third resistor R3 remains unchanged, the current flowing from the seventh controllable current source G7 into point A remains unchanged. Therefore, according to the above analysis, at this time, the increase in the current flowing into point A is equal to the current flowing into point A from the first switch tube M1. That is, at this time, the increase in the current flowing into point A is less than the increase in the current flowing out of point A, and the voltage at point A is pulled down. At the same time, since the voltage at the control terminal of the seventh controllable current source G7 remains unchanged, the current flowing through the seventh controllable current source G7 also remains unchanged. Therefore, at this time, the voltage at point C is also pulled down. The third switch tube M3 is turned off, point D remains at a low level, the tenth switch tube M10 remains on, and the output voltage VOUT is continuously pulled up by the chip power supply.

[0067] When the output voltage VOUT is pulled up by the chip power supply to a level that causes the voltage VG at point G to be higher than the first reference voltage VREF1, the voltage difference between the current input terminal and the control terminal of the first switch tube M1 is greater than the voltage difference between the current input terminal and the control terminal of the second switch tube M2. Therefore, at this time, the current flowing from the first switch tube M1 into point A is greater than the current flowing from the second switch tube M2 into point B. Since the positive control terminal of the ninth controllable current source G9 cannot flow current, the current flowing from the second switch tube M2 into point B all flows into the fourth resistor R4, increasing the voltage drop across the fourth resistor R4. Since the controllable current generated by the ninth controllable current source G9 and the voltage drop across the fourth resistor R4 are in a 1:1 positive correlation, the controllable current flowing through the ninth controllable current source G9 increases by a value equal to the current flowing from the second switch tube M2 into point B. That is, at this time, the current flowing out of point A increases, and This increase is the current flowing from the second switch tube M2 into point B. Since the voltage drop across the third resistor R3 remains unchanged, the current flowing from the seventh controllable current source G7 into point A remains unchanged. Therefore, at this time, according to the above analysis, the increase in the current flowing into point A is the current flowing from the first switch tube M1 into point A. That is, at this time, the increase in the current flowing into point A is greater than the increase in the current flowing out of point A, and the voltage at point A is pulled up. At the same time, since the voltage at the control terminal of the seventh controllable current source G7 remains unchanged, the current flowing through the seventh controllable current source G7 also remains unchanged. Therefore, at this time, the voltage at point C is also pulled up, the third switch tube M3 is turned on, and the voltage at point D is pulled up by the third switch tube M3. The tenth switch tube M10 is gradually turned off, and the output voltage VOUT gradually decreases. When the output voltage VOUT gradually decreases to the point where the voltage VG at point G is lower than the first reference voltage VREF1, the circuit enters the next cycle.

[0068] Therefore, when the circuit is in a stable state, the voltage VG at point G is equal to the first reference voltage VREF1. Therefore, when the chip power supply is connected to the circuit and the chip external power supply is not connected to the circuit, the output voltage of the output terminal of the internal power supply circuit of the chip is a first preset value, which is expressed by the following formula:

[0069] Among them, when the chip power supply and the chip external power supply are both connected, if the voltage of the chip external power supply multiplied by a preset multiple is lower than the second reference voltage, the main power supply circuit is turned on and operated according to the voltage provided by the chip power supply and the current generating circuit for the conduction work, and the auxiliary power supply circuit is turned on and operated according to the voltage provided by the chip external power supply and the current generating circuit for the conduction work, the current in the auxiliary power supply circuit is less than the current in the main power supply circuit, and the main power supply circuit stabilizes the voltage at the output end at the first preset value.

[0070] Specifically, when the external power supply of the chip is connected to the internal power supply circuit of the chip, the voltage VH at point H increases, that is, the voltage of the third terminal, i.e., the control terminal, of the ninth switch tube M9 increases, and the second terminal, i.e., the current output terminal, of the ninth switch tube M9 is pulled low by the twelfth controllable current source G12. Therefore, at this time, the ninth switch tube M9 is turned on. Therefore, a current is generated in the branch formed by the second resistor R2, the ninth switch tube M9, and the twelfth controllable current source G12, and a voltage drop is generated across the second resistor R2. Controllable currents are generated in both the fifth controllable current source G5 and the sixth controllable current source G6. At the same time, the controllable currents generated in the fifth controllable current source G5 and the sixth controllable current source G6 are positively correlated with the voltage drop across the second resistor R2 in a 1:1 relationship.

[0071] At this time, after the chip external power supply is connected to the circuit, the voltage of the chip external power supply is divided by the ninth resistor R9 and the tenth resistor R10 to obtain the H point voltage VH. The H point voltage VH is the voltage of the chip external power supply EVIN multiplied by a preset multiple, that is, the H point voltage

[0072] When the voltage of the chip's external power supply is low, that is, when the voltage VH at point H is lower than the second reference voltage VREF2, since the second terminal, i.e., the current output terminal, of the ninth switch tube M9 is connected to the second terminal, i.e., the current output terminal, of the eighth switch tube M8, the voltage difference between the first terminal, i.e., the current input terminal, and the third terminal, i.e., the control terminal, of the eighth switch tube M8 is greater than the voltage difference between the first terminal, i.e., the current input terminal, and the third terminal, i.e., the control terminal, of the ninth switch tube M9. Therefore, the current flowing through the eighth switch tube M8 is greater than the current flowing through the ninth switch tube M9. At the same time, the controllable current generated by the fourth controllable current source G4 and the voltage drop across the first resistor R1 are in a positive correlation of 1:1, and the controllable current generated by the thirteenth controllable current source G13 and the voltage drop across the eighth resistor R8 are in a positive correlation of 1:1. The voltage drop forms a positive correlation of 1:1. At this time, in conjunction with the structure of FIG2 , it can be seen that the current flowing through the ninth switch tube M9 = the current flowing through the second resistor R2 = the current flowing through the fifth controllable current source G5 = the current flowing through the sixth controllable current source G6. Therefore, when the voltage VH at point H is lower than the second reference voltage VREF2, the current flowing through the eighth switch tube M8 is greater than the current flowing through the ninth switch tube M9, and the current flowing from the fifth controllable current source G5 into point J is less than the current flowing from point J into the eighth switch tube M8. Therefore, at this time, there is still current flowing from the first resistor R1 to point J in the first resistor R1, and there is still a voltage drop across the first resistor R1. The circuit still maintains the previous working state, that is, the output voltage at the output end is still the first preset value, that is,

[0073] Among them, when the chip power supply and the chip external power supply are both connected, if the voltage of the chip external power supply multiplied by a preset multiple is greater than the second reference voltage, the main power supply circuit is shut down according to the increased current in the auxiliary power supply circuit, and the auxiliary power supply circuit stabilizes the output terminal voltage to a second preset value under the operation of the protection circuit. The second preset value is equal to the voltage of the chip external power supply.

[0074] Specifically, when the voltage of the chip external power supply rises to the point H, the voltage VH is higher than the second reference voltage VREF2, that is, when When the current flowing through the eighth switch tube M8 is less than the current flowing through the ninth switch tube M9, no current flows through the first resistor R1, the voltage at point J is pulled up to the voltage of the chip power supply, and there is no voltage drop across the first resistor R1. The first controllable current source G1, the second controllable current source G2, the third controllable current source G3, and the fourth controllable current source G4 are all turned off. That is, at this time, the main power supply circuit is turned off. Moreover, since the eighth controllable current source G8 and the tenth controllable current source G10 are in the off state, the voltage at point D is pulled up by the first current source I1, that is, the voltage at the second terminal, i.e., the control terminal, of the tenth switch tube M10 is pulled up, thereby ensuring that the main power supply circuit is turned off. At the same time, due to the generation of the voltage in the sixth controllable current source G6, A current flows to point F. Therefore, the voltage at point F is pulled up to the voltage of the chip power supply by the sixth controllable current source G6. The seventh switch tube M7 and the eleventh switch tube M11 are both turned on. At this time, on the one hand, since the voltage at the first end, i.e., the control end, of the seventh switch tube M7 is the voltage of the chip power supply, and the voltage at the second end, i.e., the control end, of the sixth switch tube M6 is the second reference voltage VREF2, the third end of the seventh switch tube M7 and the first end of the sixth switch tube M6, i.e., their current output ends, are connected, and the voltage of the chip power supply is much greater than the second reference voltage VREF2. That is, at this time, the voltage at the current output ends of the seventh switch tube M7 and the sixth switch tube M6 differs from the voltage of the chip power supply by 1 MOS transistor or The gate-source voltage difference VGS or the base-emitter voltage difference VBE of the transistor during normal operation. Therefore, the voltage difference between the second terminal (i.e., the control terminal) and the first terminal (i.e., the current output terminal) of the sixth switch tube M6 is much smaller than the gate-source voltage difference VGS or the base-emitter voltage difference VBE of the MOS transistor or transistor during normal operation. Therefore, the sixth switch tube M6 is turned off, and the voltages of the second terminal (i.e., the control terminal) and the second terminal (i.e., the current output terminal) of the fourth switch tube M4 and the second terminal (i.e., the control terminal) of the fifth switch tube M5 are pulled up by the third current source I3. At this time, the voltages of the second terminal (i.e., the control terminal) and the third terminal (i.e., the current output terminal) of the fourth switch tube M4 are equal, ensuring that the fourth switch tube M4 is in the off state. At the same time, although the voltage at point C is a floating voltage However, this voltage is necessarily lower than the maximum voltage of the circuit, that is, it is necessarily lower than the voltage of the chip power supply. Therefore, the voltage of the third terminal of the third switch tube M3, i.e., the control terminal, is lower than the voltage of its current output terminal, thereby ensuring that the third switch tube M3 is also in the off state. Therefore, at this time, since the fourth switch tube M4 and the third switch tube M3 are both ensured to be in the off state, the voltage at point D will not be pulled down due to the mis-conduction of the fourth switch tube M4 and the third switch tube M3, thereby ensuring that the main power supply circuit is in a completely off state. On the other hand, the voltage at point F is pulled high, the first inverter A1 outputs a low level, the eleventh switch tube M11 is turned on, and the output voltage VOUT of the chip's internal power supply circuit = EVIN. At this time, the voltage value of the chip's external power supply can be set according to the actual needs of the application scenario, so that the output voltage of the output terminal of the chip's internal power supply circuit meets the needs of the application scenario.

[0075] In an optional embodiment, the protection circuit is used to control the voltage of components in the main power supply circuit when the main power supply circuit is turned on, so as to protect the components in the main power supply circuit.

[0076] Specifically, when the main power supply circuit is in an operating state, the voltage at the second end, i.e., the control end, of the fourth switch tube M4 is clamped at VIN-VD by the first Zener diode D1, where VD is the reverse breakdown voltage of the first Zener diode D1. At this time, when the voltage at point D is lower than VIN-VD-VGS4 (VGS4 is the gate-source voltage difference when the fourth switch tube M4 is operating normally), the fourth switch tube M4 is turned on. Therefore, the voltage at point D is clamped by the fourth switch tube M4 at VIN-VD-VGS4, thereby ensuring that the gate-source voltage difference of the tenth switch tube M10 is lower than VD+VGS4, thereby achieving the first level of protection for the tenth switch tube M10.

[0077] At the same time, when the voltage at point C is lower than VIN-VD-VGS5 (VGS5 is the gate-source voltage difference when the fifth switch tube M5 is operating normally), the fifth switch tube M5 is turned on. Therefore, the voltage at point C is clamped by the fifth switch tube M5 to VIN-VD-VGS5. At this time, when the voltage at point D is lower than VIN-VD-VGS5-VGS3 (VGS3 is the gate-source voltage difference when the third switch tube M3 is operating normally), the third switch tube M3 is turned on. Therefore, the voltage at point D is clamped by the third switch tube M3 to VIN-VD-VGS5-VGS3, thereby ensuring that the gate-source voltage difference of the tenth switch tube M10 is lower than VD+VGS5+VGS3, thereby achieving a second level of protection for the tenth switch tube M10.

[0078] It should be noted that the switching transistors in the current generation circuit, the main power supply circuit, the auxiliary power supply circuit, and the protection circuit, i.e., the switching transistors shown in FIG2 , can be MOS transistors or corresponding transistors. This embodiment does not limit the specific type of switching transistor. Specifically, when the switching transistors are transistors, the gate-source voltage difference of the third, fourth, and fifth switching transistors involved in the operation of the protection circuit is converted to the voltage difference VBE between the base and emitter of the transistors during normal operation.

[0079] This embodiment provides a chip internal power supply circuit, which has two voltage inputs. When the circuit is only connected to the chip power supply, the output voltage VOUT of the chip internal power supply circuit is a fixed value. When the fixed value cannot meet the needs of the switching power supply circuit, the chip can be connected to an external power supply. At this time, in order to prevent the auxiliary power supply circuit from being triggered by mistake, the chip can be connected only when the voltage provided by the external power supply is greater than Only when the output voltage VOUT of the chip's internal power supply circuit is clamped to the voltage provided by the chip's external power supply, at this time, by designing the voltage provided by the chip's external power supply to the required voltage value, the needs of switching power supply circuits in different application scenarios can be met, thereby ensuring that the chip's internal power supply circuit is suitable for switching power supply circuits in multiple scenarios.

[0080] As shown in Figure 3, an embodiment of the present application further provides an integrated circuit control chip, comprising: the internal chip power supply circuit of the above-described embodiment. It should be noted that, in addition to the internal chip power supply circuit of the above-described embodiment, the integrated circuit control chip may also include other circuit structures capable of implementing its control functions, as described in related art. This embodiment does not limit the specific structure of the integrated circuit control chip.

[0081] As shown in FIG4 , an embodiment of the present application further provides a switching power supply circuit, comprising: the integrated circuit control chip of the above-described embodiment. The switching power supply circuit can be used to charge a battery. Specifically, in addition to the integrated circuit control chip, the switching power supply circuit can also include a power circuit to achieve its battery charging function.

[0082] The switching power supply circuit provided in this embodiment includes an integrated circuit control chip having the internal chip power supply circuit of the above embodiment. In different application scenarios, the chip's external power supply can be set to a required voltage value, so that the internal chip power supply circuit can output the required voltage value based on the chip's external power supply. Thus, the switching power supply circuit can meet the requirements of switching power supply circuits in different application scenarios.

[0083] Although the exemplary embodiments and their advantages have been described in detail, those skilled in the art may make various changes, substitutions, and modifications to these embodiments without departing from the spirit of the present application and the scope of protection defined by the appended claims, and such modifications and variations are all within the scope defined by the appended claims. For other examples, those skilled in the art will readily understand that the order of the process steps may be changed while remaining within the scope of protection of the present application.

[0084] In addition, the scope of application of this application is not limited to the processes, mechanisms, manufactures, material compositions, means, methods, and steps of the specific embodiments described in the specification. From the disclosure of this application, a person of ordinary skill in the art will readily understand that any process, mechanism, manufacture, material composition, means, method, or step that currently exists or will be developed in the future, where they perform substantially the same functions or obtain substantially the same results as the corresponding embodiments described in this application, can be applied in accordance with this application. Therefore, the claims appended to this application are intended to include such processes, mechanisms, manufactures, material compositions, means, methods, or steps within their scope of protection.

Claims

1. A chip internal power supply circuit, characterized in that: include: Current generating circuit, main power supply circuit, auxiliary power supply circuit and protection circuit; The first end of the current generating circuit is connected to the chip power supply, the second end of the current generating circuit is grounded, the third end of the current generating circuit is connected to the first end of the main power supply circuit and the first end of the auxiliary power supply circuit, the fourth end of the current generating circuit is connected to the second end of the auxiliary power supply circuit, and the current generating circuit is used to conduct according to the voltage provided by the chip power supply after the chip power supply is connected; The second end of the main power supply circuit is connected to the chip power supply, the third end of the main power supply circuit is grounded, the fourth end of the main power supply circuit is connected to the first end of the protection circuit, the fifth end of the main power supply circuit is connected to the second end of the protection circuit, the sixth end of the main power supply circuit is connected to the third end of the protection circuit, the seventh end of the main power supply circuit is connected to the fourth end of the auxiliary power supply circuit, the eighth end of the main power supply circuit is connected to the fifth end of the auxiliary power supply circuit, the ninth end of the main power supply circuit is connected to the sixth end and the output end of the auxiliary power supply circuit, the tenth end of the main power supply circuit is connected to the first reference voltage, the first end and the third end of the protection circuit are connected, and the eleventh end of the main power supply circuit is connected to the second reference voltage and the seventh end of the auxiliary power supply circuit; The third end of the auxiliary power supply circuit is connected to the fourth end of the protection circuit, the eighth end of the auxiliary power supply circuit is connected to the chip power supply, the ninth end of the auxiliary power supply circuit is grounded, the tenth end of the auxiliary power supply circuit is connected to the chip external power supply, the fifth end of the protection circuit is connected to the chip power supply, and the protection circuit works according to the voltage provided by the chip power supply; When the chip power supply is connected and the chip external power supply is not connected, the main power supply circuit is turned on and operated according to the voltage provided by the chip power supply and the current generating circuit that is turned on, the auxiliary power supply circuit is turned off according to the main power supply circuit that is turned on, and the main power supply circuit stabilizes the voltage at the output end at a first preset value; When the chip power supply and the chip external power supply are both connected, if the voltage of the chip external power supply multiplied by a preset multiple is greater than the second reference voltage, the main power supply circuit is shut down according to the increased current in the auxiliary power supply circuit, and the auxiliary power supply circuit stabilizes the output terminal voltage at a second preset value under the operation of the protection circuit, and the second preset value is equal to the voltage of the chip external power supply; When the chip power supply and the chip external power supply are both connected, if the voltage of the chip external power supply multiplied by a preset multiple is lower than the second reference voltage, the main power supply circuit is turned on and operated according to the voltage provided by the chip power supply and the current generating circuit that is turned on, the auxiliary power supply circuit is turned on and operated according to the voltage provided by the chip external power supply and the current generating circuit that is turned on, the current in the auxiliary power supply circuit is less than the current in the main power supply circuit, and the main power supply circuit stabilizes the voltage at the output end at a first preset value; The protection circuit is used to control the voltage of the components in the main power supply circuit when the main power supply circuit is turned on, so as to protect the components in the main power supply circuit.

2. The chip internal power supply circuit according to claim 1, characterized in that: The current generating circuit includes: a second current source, a seventh resistor, an eleventh controllable current source and a twelfth controllable current source, one end of the second current source is connected to the chip power supply, the other end of the second current source is connected to one end of the seventh resistor, the positive control end of the eleventh controllable current source and the positive control end of the twelfth controllable current source, the other end of the seventh resistor is connected to the negative control end and the output end of the eleventh controllable current source, the negative control end and the output end of the twelfth controllable current source and grounded, the input end of the eleventh controllable current source is connected to the second end of the auxiliary power supply circuit, and the input end of the twelfth controllable current source is connected to the first end of the main power supply circuit and the first end of the auxiliary power supply circuit.

3. The chip internal power supply circuit according to claim 1, characterized in that: The main power supply circuit includes: a first resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, an eighth resistor, a first controllable current source, a second controllable current source, a third controllable current source, a fourth controllable current source, a seventh controllable current source, an eighth controllable current source, a ninth controllable current source, a tenth controllable current source, a thirteenth controllable current source, a first current source, a first switch tube, a second switch tube, an eighth switch tube and a tenth switch tube; One end of the first resistor is connected to the positive control end and input end of the first controllable current source, the positive control end and input end of the second controllable current source, the positive control end and input end of the third controllable current source, the positive control end and input end of the fourth controllable current source, the first end of the tenth switch tube, the first end of the first current source and the chip power supply; the other end of the first resistor is connected to the negative control end of the first controllable current source, the output end of the second controllable current source, the output end of the third controllable current source, the output end of the fourth controllable current source, the fifth end of the auxiliary power supply circuit and the first end of the eighth switch tube; the second end of the tenth switch tube is connected to the second end of the first current source and the first end of the protection circuit; the third end of the tenth switch tube is connected to one end of the fifth resistor, the sixth end and the output end of the auxiliary power supply circuit; the second end of the eighth switch tube is connected to the third end of the current generating circuit and the first end of the auxiliary power supply circuit; the third end of the eighth switch tube is connected to the second reference voltage and the seventh end of the auxiliary power supply circuit; The output end of the first controllable current source is connected to one end of the third resistor, the positive control end of the seventh controllable current source and the positive control end of the eighth controllable current source, the other end of the third resistor is connected to the negative control end of the seventh controllable current source, the negative control end of the eighth controllable current source G8, one end of the fourth resistor, the first end of the second switch tube, the positive control end of the ninth controllable current source and the positive control end of the tenth controllable current source, the other end of the fourth resistor is connected to the negative control end and the output end of the ninth controllable current source, the negative control end and the output end of the tenth controllable current source and is grounded, the input end of the eighth controllable current source is connected to the third end of the protection circuit, and the input end of the ninth controllable current source is connected to the output end of the seventh controllable current source and the first end of the first switch tube; The output end of the second controllable current source is connected to the second end of the first switch tube and the second end of the second switch tube, the third end of the first switch tube is connected to the first reference voltage, the third end of the second switch tube is connected to the other end of the fifth resistor and one end of the sixth resistor, the other end of the sixth resistor is grounded, the output end of the third controllable current source is connected to the input end of the seventh controllable current source and the second end of the protection circuit, the output end of the fourth controllable current source is connected to one end of the eighth resistor and the positive control end of the thirteenth controllable current source, the other end of the eighth resistor is connected to the negative control end and the output end of the thirteenth controllable current source and is grounded, and the input end of the thirteenth controllable current source is connected to the fourth end of the auxiliary power supply circuit.

4. The chip internal power supply circuit according to claim 1, characterized in that: The auxiliary power supply circuit includes: a second resistor, a ninth resistor, a tenth resistor, a fifth controllable current source, a sixth controllable current source, a first inverter, a sixth switch tube, a seventh switch tube, a ninth switch tube and an eleventh switch tube; One end of the second resistor is connected to the positive control end and the input end of the fifth controllable current source, the positive control end and the input end of the sixth controllable current source and the chip power supply, the other end of the second resistor is connected to the negative control end of the fifth controllable current source, the negative control end of the sixth controllable current source and the first end of the ninth switch tube, the output end of the fifth controllable current source is connected to the eighth end of the main power supply circuit, the output end of the sixth controllable current source is connected to the seventh end of the main power supply circuit, one end of the first inverter and the first end of the seventh switch tube, the second end of the seventh switch tube is connected to the ninth end and the output end of the main power supply circuit, and the third end of the seventh switch tube is connected to the first end of the sixth switch tube and the fourth end of the current generating circuit; The second end of the sixth switch tube is connected to the second reference voltage and the eleventh end of the main power supply circuit, the third end of the sixth switch tube is connected to the fourth end of the protection circuit, the second end of the ninth switch tube is connected to the third end of the current generating circuit and the first end of the main power supply circuit, the third end of the ninth switch tube is connected to one end of the ninth resistor and one end of the tenth resistor, the other end of the tenth resistor is grounded, the other end of the ninth resistor is connected to the chip external power supply and the first end of the eleventh switch tube, the second end of the eleventh switch tube is connected to the other end of the first inverter, and the third end of the eleventh switch tube is connected to the ninth end and the output end of the main power supply circuit.

5. The chip internal power supply circuit according to claim 1, characterized in that: The protection circuit includes: a third current source, a first voltage-stabilizing diode, a third switch tube, a fourth switch tube and a fifth switch tube, one end of the third current source is connected to the cathode of the first voltage-stabilizing diode, the first end of the third switch tube, the first end of the fourth switch tube, the first end of the fifth switch tube and the chip power supply, the other end of the third current source is connected to the second end of the fourth switch tube, the second end of the fifth switch tube, the anode of the first voltage-stabilizing diode and the third end of the auxiliary power supply circuit, the third end of the fourth switch tube is connected to the second end of the third switch tube, the fourth end of the main power supply circuit and the sixth end of the main power supply circuit, and the third end of the fifth switch tube is connected to the third end of the third switch tube and the fifth end of the main power supply circuit.

6. The chip internal power supply circuit according to claim 3, characterized in that: The first preset value is expressed by the following formula: In the formula, VREF1 represents the first reference voltage, R5 represents the resistance value of the fifth resistor, and R6 represents the resistance value of the sixth resistor.

7. The chip internal power supply circuit according to claim 4, characterized in that: The preset multiple is equal to: In the formula, R9 represents the resistance value of the ninth resistor, and R10 represents the resistance value of the tenth resistor.

8. An integrated circuit control chip, characterized in that: include: The chip internal power supply circuit according to any one of claims 1 to 7.

9. A switching power supply circuit, characterized in that: include: The integrated circuit control chip as claimed in claim 8.

10. The switching power supply circuit according to claim 9, characterized in that: The switching power supply circuit is used for charging the battery.

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