Chip power supply circuit and electronic circuit

Abstract

The utility model relates to a chip power supply circuit and an electronic circuit. The chip power supply circuit judges whether the power supply voltage of the battery is smaller than the preset working voltage of the chip or not through the power supply access switching circuit, the power supply circuit is switched to a direct connection access when the power supply voltage of the battery is smaller than the preset working voltage of the chip, and the battery supplies power to the chip through the switch module. The condition that the power supply voltage cannot meet the preset working voltage of the chip due to partial voltage drop loss caused by the power supply voltage passing through the voltage dividing unit is avoided; when the power supply voltage of the battery is greater than or equal to the preset working voltage of the chip, the power supply circuit is switched to the step-down access, the battery supplies power to the chip through the voltage dividing unit, and the power supply voltage consumes part of voltage drop through the voltage dividing unit so as to reduce the voltage provided to the chip. And the damage risk of the chip caused by the fact that the voltage for supplying power to the chip exceeds the maximum preset working voltage of the chip is avoided.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a chip power supply circuit and electronic circuit. Background Technology

[0002] Most existing chips are powered by batteries, but the maximum supply voltage of the battery often exceeds the maximum preset operating voltage of the chip, which poses a risk of overvoltage damage to the chip. In order to avoid providing the chip with an excessive supply voltage, the existing technology connects a Schottky diode in series between the chip and the battery to reduce the supply voltage of the battery. However, when the supply voltage of the battery is low, combined with the voltage drop of the Schottky diode, the supply voltage provided to the chip is less than the chip's minimum operating voltage, causing the chip to fail to work properly. Utility Model Content

[0003] This application provides a chip power supply circuit to solve the problem of negative impact on the chip when the battery power supply voltage fluctuates.

[0004] In a first aspect, this application provides a chip power supply circuit, the chip power supply circuit comprising:

[0005] Batteries are used to provide power supply voltage;

[0006] A power supply path switching circuit is provided, wherein the input terminal of the power supply path switching circuit is connected to the battery, and the output terminal of the power supply path switching circuit is connected to a direct-connect circuit. When the power supply voltage is less than the preset working voltage, the power supply path is switched to the direct-connect circuit, and when the power supply voltage is greater than or equal to the preset working voltage, the power supply path is switched to a step-down circuit.

[0007] The direct connection circuit includes a switching module, which is connected to the power supply path switching circuit, the battery, and the chip to be powered, respectively; the switching module is used to switch the power supply path to the direct connection circuit or the step-down circuit;

[0008] The voltage reduction path includes a voltage divider unit, and the preset operating voltage is the sum of the minimum operating voltage of the chip and the voltage drop of the voltage divider unit; the voltage divider unit is connected to the battery and the chip to be powered.

[0009] Optionally, the voltage divider unit is a voltage divider diode, the positive terminal of the voltage divider diode is connected to the battery, and the negative terminal of the voltage divider diode is connected to the chip; the switching module is connected between the positive and negative terminals of the voltage divider diode.

[0010] When the switching module receives the shutdown signal output by the power supply path switching circuit, it is in the shutdown state to switch the power supply path to the step-down path, so that the power supply voltage is provided to the chip after passing through the voltage divider diode;

[0011] When the switching module receives the conduction signal output by the power supply path switching circuit, it is in the conduction state to switch the power supply path to the direct connection path, so that the power supply voltage is provided to the chip after passing through the switching module.

[0012] Optionally, the power supply path switching circuit includes a voltage acquisition circuit, a voltage regulator, and a voltage comparator. The input terminal of the voltage acquisition circuit is connected to the battery, and the output terminal of the voltage acquisition circuit is connected to the positive input terminal of the voltage comparator. The input terminal of the voltage regulator is connected to the battery, and the output terminal of the voltage regulator is connected to the negative input terminal of the voltage comparator. The output terminal of the voltage comparator is connected to the switching module. The voltage acquisition circuit provides a detection voltage for the voltage comparator, and the voltage regulator provides a reference voltage for the voltage comparator.

[0013] The voltage comparator is used to output a turn-off signal when the detected voltage is greater than or equal to the reference voltage, and to output a turn-on signal when the detected voltage is less than the reference voltage.

[0014] Optionally, the detection voltage acquired by the voltage acquisition circuit is the power supply voltage of the battery, and the reference voltage provided by the voltage regulator to the voltage comparator is the preset operating voltage of the chip.

[0015] Optionally, the detection voltage acquired by the voltage acquisition circuit is half of the supply voltage, and the reference voltage provided by the voltage regulator to the voltage comparator is half of the preset operating voltage of the chip.

[0016] Optionally, the voltage acquisition circuit includes a first resistor and a second resistor with the same resistance value. The first end of the first resistor is connected to the battery, the second end of the first resistor is connected to the first end of the second resistor and the positive input terminal of the voltage comparator, and the second end of the second resistor is grounded.

[0017] Optionally, the switching module includes a field-effect transistor.

[0018] Optionally, a filter capacitor is connected to both the input and output terminals of the voltage regulator.

[0019] Optionally, a current-limiting resistor is connected between the first and third terminals of the switching module, the first terminal of the switching module is connected to the positive terminal of the voltage divider diode, and the third terminal of the switching module is connected to the output terminal of the voltage comparator.

[0020] In a second aspect, an electronic circuit is provided, the electronic circuit comprising an electrically connected chip and a chip power supply circuit as described in any of the preceding claims.

[0021] The structure provided in this application uses a power supply path switching circuit to determine whether the battery's supply voltage is less than the chip's preset operating voltage. When the battery's supply voltage is less than the chip's preset operating voltage, the power supply circuit is switched to a direct-connect path. In this case, the battery supplies power to the chip through a switching module, avoiding the loss of voltage drop due to the voltage divider unit, which would prevent the supply voltage from failing to meet the chip's preset operating voltage. When the battery's supply voltage is greater than or equal to the chip's preset operating voltage, the power supply circuit is switched to a step-down path. In this case, the battery supplies power to the chip through a voltage divider unit. The supply voltage consumes some voltage drop through the voltage divider unit, thereby reducing the voltage supplied to the chip. This avoids the voltage supplied to the chip exceeding the chip's maximum preset operating voltage, which could damage the chip. Regardless of whether the battery's supply voltage is higher or lower than the chip's preset operating voltage, the chip can be ensured to operate safely and normally, thus solving the problem of negative impacts on the chip caused by fluctuations in the battery's supply voltage. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0025] Figure 1 This is a schematic diagram of a chip power supply circuit provided in an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of a chip power supply circuit provided in an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of a chip power supply circuit provided in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of a chip power supply circuit provided in an embodiment of this application;

[0029] Figure 5This is a schematic diagram of a chip power supply circuit provided in an embodiment of this application. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0032] Figure 1 This is a schematic diagram of the power supply circuit for chip 150 in one embodiment. (Refer to...) Figure 1 The power supply circuit for the chip 150 specifically includes:

[0033] Battery 110 is used to provide power supply voltage;

[0034] A power supply path switching circuit 120 is provided. The input terminal of the power supply path switching circuit 120 is connected to the battery 110, and the output terminal of the power supply path switching circuit 120 is connected to a direct-connect circuit. When the power supply voltage is less than the preset working voltage, a conduction signal is output to switch the power supply path to the direct-connect circuit. When the power supply voltage is greater than or equal to the preset working voltage, a shutdown signal is output to switch the power supply path to a step-down circuit.

[0035] The direct connection circuit includes a switch module 140, which is connected to the power supply path switching circuit 120, the battery 110, and the chip 150 to be powered, respectively; the switch module 140 is used to switch the power supply path to the direct connection circuit or the step-down circuit.

[0036] The voltage reduction path includes a voltage divider unit 130, and the preset operating voltage is the sum of the minimum operating voltage of the chip and the voltage drop of the voltage divider unit 130; the voltage divider unit 130 is connected to the battery 110 and the chip 150 to be powered.

[0037] Specifically, the minimum supply voltage of battery 110 is greater than or equal to the minimum operating voltage of chip 150, the maximum supply voltage of battery 110 is greater than or equal to the maximum operating voltage of chip 150, and the voltage difference between the maximum supply voltage of battery 110 and the maximum operating voltage of chip 150 is less than a preset voltage difference. Any power supply device that meets the above conditions can be used as battery 110 in this embodiment. For example, the supply voltage range of battery 110 is 3.3 to 4.48V, and the operating voltage range of chip 150 is 3.3 to 4.3V. Chip 150 can be any type of chip powered by battery 110, such as Bluetooth chip, microcontroller chip (MCU), microprocessor chip (CPU), digital signal processor chip (DSP), sensor chip, flash memory chip, short-range wireless communication chip, etc.

[0038] The power supply path switching circuit 120 is used to detect whether the power supply voltage of the battery 110 is less than the preset operating voltage of the chip 150, and outputs a corresponding switch control signal according to the detection result to control the conduction state of the switch module 140. The switch module 140 is connected between the two ends of the voltage divider unit 130. Therefore, the conduction state of the switch module 140 will affect the on / off state of the voltage divider unit 130. When the power supply path switching circuit 120 detects that the power supply voltage is less than the preset operating voltage, it controls the switch module 140 to conduct. At this time, the voltage divider unit 130 is short-circuited by the switch module 140. The battery 110 supplies power to the chip 150 through the switch module 140 (i.e., the direct connection circuit), avoiding the loss of some voltage drop due to the voltage divider unit 130, which would cause the power supply voltage to fail to meet the preset operating voltage of the chip 150.

[0039] When the supply voltage of battery 110 is greater than or equal to the preset operating voltage of chip 150, the control switch module 140 is turned off. At this time, battery 110 supplies power to chip 150 through voltage divider unit 130 (i.e., step-down path). The supply voltage is partially consumed by voltage divider unit 130 to reduce the voltage supplied to chip 150, thus preventing the supply voltage to chip 150 from exceeding the maximum preset operating voltage of chip 150 and causing damage to chip 150. The voltage divider unit 130 in the step-down path can be any component or integrated circuit with a voltage drop, such as voltage divider unit 130 including at least one of voltage divider resistor, voltage divider capacitor, voltage divider inductor, voltage divider diode, etc.

[0040] The preset operating voltage is the sum of the minimum operating voltage of chip 150 and the voltage drop of the voltage divider unit 130. For example, if the minimum operating voltage of chip 150 is 3.3V and the voltage drop of the voltage divider unit 130 is 0.3V, then the preset operating voltage is 3.6V. This ensures that the voltage transmitted to chip 150 through the voltage divider unit 130 is greater than the minimum operating voltage and will not exceed the maximum operating voltage of chip 150.

[0041] Based on the structure of the power supply circuit for chip 150 described above, when the supply voltage is greater than the preset operating voltage, it is stepped down by the voltage divider unit 130 before supplying power to chip 150, thus ensuring that the supply voltage is less than the maximum operating voltage of chip 150. When the supply voltage is less than the preset operating voltage, the switch module 140 directly supplies power to chip 150, ensuring that the supply voltage is greater than or equal to the minimum operating voltage of chip 150. In other words, regardless of whether the supply voltage from battery 110 is higher or lower than the preset operating voltage of chip 150, it ensures that chip 150 can operate safely and normally, thereby solving the problem of negative impacts on chip 150 caused by fluctuations in the supply voltage from battery 110.

[0042] In one embodiment, refer to Figure 2 The voltage divider unit is a voltage divider diode 131. The positive terminal of the voltage divider diode 131 is connected to the battery, and the negative terminal of the voltage divider diode 131 is connected to the chip. The switching module 140 is connected between the positive and negative terminals of the voltage divider diode 131.

[0043] When the switching module 140 receives the shutdown signal output by the power supply path switching circuit, it is in the shutdown state to switch the power supply path to the step-down path, so that the power supply voltage is provided to the chip after passing through the voltage divider diode 131.

[0044] When the switching module 140 receives the conduction signal output by the power supply path switching circuit, it is in the conduction state to switch the power supply path to the direct connection path, so that the power supply voltage is provided to the chip after passing through the switching module 140.

[0045] Specifically, using a voltage divider diode 131 as the voltage divider unit provides stable voltage drop, which can, to some extent, offset the effects of temperature changes on circuit parameters, thereby improving circuit stability and accuracy. Furthermore, the unidirectional conductivity of the diode allows it to provide voltage limiting protection while performing voltage division. When the input voltage exceeds the diode's reverse breakdown voltage, the diode will reverse-break down and conduct, limiting the voltage within a certain range and preventing damage to subsequent chips due to overvoltage. Diodes are typically small in size and relatively inexpensive. In circuits with high space and cost constraints, using diodes for voltage division can reduce circuit size and cost while still meeting functional requirements.

[0046] Using the path of the voltage divider diode 131 as the step-down path, the step-down voltage drop is the voltage drop across the diode 131. At this time, the preset operating voltage is the sum of the minimum operating voltage of the chip and the voltage drop across the diode 131. When the supply voltage is greater than the preset operating voltage, the chip 150 is powered by stepping down through the diode 131 to meet the requirement that the supply voltage is less than the maximum operating voltage of the chip 150. When the supply voltage is less than the preset operating voltage, the chip 150 is powered directly through the switching module 140 to meet the requirement that the supply voltage is greater than or equal to the minimum operating voltage of the chip 150.

[0047] In one embodiment, refer to Figure 3 The power supply path switching circuit 120 includes a voltage acquisition circuit, a voltage regulator, and a voltage comparator. The input terminal of the voltage acquisition circuit is connected to the battery 110, and the output terminal of the voltage acquisition circuit is connected to the positive input terminal of the voltage comparator. The input terminal of the voltage regulator is connected to the battery 110, and the output terminal of the voltage regulator is connected to the negative input terminal of the voltage comparator. The output terminal of the voltage comparator is connected to the switching module 140. The voltage acquisition circuit provides a detection voltage for the voltage comparator, and the voltage regulator provides a reference voltage for the voltage comparator.

[0048] The voltage comparator is used to output a turn-off signal when the detected voltage is greater than or equal to the reference voltage, and to output a turn-on signal when the detected voltage is less than the reference voltage.

[0049] Specifically, the voltage acquisition circuit can be any device or integrated circuit with voltage acquisition function, such as an analog-to-digital converter (ADC) chip with voltage acquisition function, a microcontroller with ADC function, a voltage sensor, etc., used to acquire the voltage output by the battery 110 as the detection voltage.

[0050] The voltage regulator is used to provide a stable reference voltage for the voltage comparator. The ratio between the reference voltage and the preset operating voltage is equal to the ratio between the detection voltage and the supply voltage. In other words, the setting of the reference voltage is determined by the voltage acquisition circuit's setting of the detection voltage.

[0051] The voltage comparator compares the detected voltage with the reference voltage. When the detected voltage is greater than or equal to the reference voltage, it indicates that the supply voltage is greater than or equal to the preset operating voltage. The comparator then outputs a high-level shutdown signal to turn off the switch module 140. At this time, the battery 110 supplies power to the chip 150 through the voltage divider diode 131. If the battery 110 supplies power to the chip 150 directly through the switch module 140, the supply voltage may exceed the maximum operating voltage of the chip 150. Therefore, the supply voltage needs to be stepped down by the voltage divider diode 131 before supplying power to the chip 150 to ensure that the supply voltage does not cause any risk of damage to the chip 150.

[0052] When the voltage comparator detects a voltage lower than the reference voltage, it indicates that the supply voltage is lower than the preset operating voltage. It then outputs a low-level turn-on signal to turn on the switch module 140. At this time, the battery 110 supplies power to the chip 150 through the switch module 140. If the battery 110 supplies power to the chip 150 through the voltage divider diode 131, the supply voltage will be further reduced, which may cause the supply voltage to be lower than the minimum operating voltage of the chip 150 and thus fail to meet the normal operating requirements of the chip 150. Therefore, the supply voltage that is lower than the preset operating voltage but greater than or equal to the minimum operating voltage of the chip is directly supplied to the chip 150 to ensure that the chip 150 can work normally.

[0053] Taking a preset operating voltage of 3.6V, a voltage drop of 0.3V from the voltage divider diode 131, and a minimum supply voltage of 3.3V as an example, when the supply voltage is greater than or equal to 3.6V, even if 0.3V is diverted through the voltage divider diode 131, it can still provide a voltage greater than or equal to 3.3V to the chip 150. This not only meets the minimum operating voltage requirement of the chip 150 but also prevents the supply voltage from exceeding the maximum operating voltage of the chip 150. When the supply voltage is less than 3.6V, the supply voltage is directly supplied to the chip 150 through the switching module 140, which can also provide a supply voltage greater than or equal to 3.3V but less than 3.6V to the chip 150, still meeting the minimum operating voltage requirement of the chip 150.

[0054] In one embodiment, the voltage detected by the voltage acquisition circuit is the power supply voltage of the battery 110, and the reference voltage provided by the voltage regulator to the voltage comparator is the preset operating voltage of the chip 150.

[0055] Specifically, the voltage acquisition circuit can directly acquire the power supply voltage output by the battery 110. At this time, the reference voltage is equal to the preset working voltage. The voltage comparator compares the detected voltage with the reference voltage to directly determine whether the power supply voltage is less than the preset working voltage. Based on the judgment result, the corresponding on / off signal is output to control the switching state of the switch module 140.

[0056] In one embodiment, the detection voltage acquired by the voltage acquisition circuit is half of the supply voltage, and the reference voltage provided by the voltage regulator to the voltage comparator is half of the preset operating voltage corresponding to the chip 150.

[0057] Specifically, the voltage acquisition circuit acquires a detection voltage that is half of the supply voltage, and the corresponding reference voltage is half of the preset operating voltage. At this time, by judging whether the detection voltage is less than the reference voltage, it can indirectly judge whether the supply voltage is less than the preset operating voltage, and can also output the corresponding channel signal to control the switching state of the switch module 140.

[0058] In one embodiment, refer to Figure 4 The voltage acquisition circuit includes a first resistor and a second resistor with the same resistance value. The first end of the first resistor is connected to the battery 110, the second end of the first resistor is connected to the first end of the second resistor and the positive input terminal of the voltage comparator, and the second end of the second resistor is grounded.

[0059] Specifically, Figure 4 R1 is the first resistor and R2 is the second resistor. The voltage acquisition circuit includes a first resistor and a second resistor with the same resistance value. The first resistor and the second resistor are divided to provide a detection voltage of half the supply voltage to the voltage comparator, thereby realizing the acquisition of the detection voltage.

[0060] In one embodiment, the switching module 140 includes a field-effect transistor.

[0061] Specifically, refer to Figure 4 The switching module 140 is implemented using a field-effect transistor (PMOS), but it can also be implemented using a transistor, relay, or thyristor. When the switching module 140 receives a high-level signal from the voltage comparator, it is in the off state, and the battery 110 supplies power to the chip 150 through the voltage divider diode 131. When the switching module 140 receives a low-level signal from the voltage comparator, it is in the on state, and the battery 110 supplies power to the chip 150 through the switching module 140. This allows the switching module 140 to switch between two power supply modes: direct power supply from the battery 110 and step-down power supply from the battery 110.

[0062] In one embodiment, refer to Figure 5 The voltage regulator has a filter capacitor connected to its input and output terminals respectively, which filters the power supply voltage entering the voltage regulator and the reference voltage output by the voltage regulator, so as to ensure the stability and reliability of the reference voltage output by the voltage regulator.

[0063] Figure 5 C642 ​​and C643 are filter capacitors, R1 is the first resistor, R2 is the second resistor, VBAT is used to indicate the connection pin of battery 110, TL_VBAT is used to indicate the connection pin of chip 150, U605 is a voltage regulator, the VDD pin of the voltage comparator is connected to battery 110 and filter capacitor C641 respectively, D1 is a voltage divider diode, and Q1 is a switching module.

[0064] In one embodiment, a current-limiting resistor is connected between the first and third terminals of the switching module 140. The first terminal of the switching module 140 is connected to the positive terminal of the voltage divider diode 131, and the third terminal of the switching module 140 is connected to the output terminal of the voltage comparator.

[0065] Specifically, refer to Figure 5 A current-limiting resistor, R654, is connected between the first and third terminals of the switching module 140. This resistor provides a discharge path for accumulated charge when the switching module 140 turns off the PMOS transistor, enabling the switching module 140 to turn off quickly and preventing turn-off delays or false turn-on due to residual charge. This improves the switching speed and stability of the switching module 140. For example, when the switching module 140 changes from the on state to the off state, the charge on the gate capacitor discharges quickly through the current-limiting resistor, helping the switching module 140 to turn off rapidly. It also makes the input characteristics of the switching module 140 more stable, reducing input signal reflection and oscillation, and improving the anti-interference capability of the power supply circuit. When the switching module 140 experiences abnormal conditions, such as overvoltage or overcurrent, the current-limiting resistor can limit the current or divide the voltage, thus protecting the switching module 140 from damage.

[0066] In one embodiment, an electronic circuit is provided, the electronic circuit including a chip and a chip driving circuit as described in any of the preceding embodiments.

[0067] In one embodiment, an electronic device is provided, which includes the electronic circuit of the previous embodiment. When the chip is a Bluetooth chip, the electronic device can be any device with Bluetooth function, such as a Bluetooth speaker, Bluetooth keyboard, smart terminal, smart home device, etc.

[0068] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The steps, processes, and operations of the chip 150 power supply circuit described herein are not construed as requiring them to be performed in the specific order described or illustrated unless the order of execution is explicitly indicated. It should also be understood that alternatives or substitutions may be used.

[0069] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A chip power supply circuit, characterized in that, The chip power supply circuit includes: Batteries are used to provide power supply voltage; A power supply path switching circuit is provided, wherein the input terminal of the power supply path switching circuit is connected to the battery, and the output terminal of the power supply path switching circuit is connected to a direct-connect circuit. When the power supply voltage is less than the preset working voltage, the power supply path is switched to the direct-connect circuit, and when the power supply voltage is greater than or equal to the preset working voltage, the power supply path is switched to the step-down circuit. The direct connection circuit includes a switching module, which is connected to the power supply path switching circuit, the battery, and the chip to be powered, respectively; the switching module is used to switch the power supply path to the direct connection circuit or the step-down circuit; The voltage reduction path includes a voltage divider unit, and the preset operating voltage is the sum of the minimum operating voltage of the chip and the voltage drop of the voltage divider unit; the voltage divider unit is connected to the battery and the chip to be powered.

2. The chip power supply circuit according to claim 1, characterized in that, The voltage divider unit is a voltage divider diode, the positive terminal of which is connected to the battery, and the negative terminal of which is connected to the chip; the switching module is connected between the positive and negative terminals of the voltage divider diode. When the switching module receives the shutdown signal output by the power supply path switching circuit, it is in the shutdown state to switch the power supply path to the step-down path, so that the power supply voltage is provided to the chip after passing through the voltage divider diode; When the switching module receives the conduction signal output by the power supply path switching circuit, it is in the conduction state to switch the power supply path to the direct connection path, so that the power supply voltage is provided to the chip after passing through the switching module.

3. The chip power supply circuit according to claim 2, characterized in that, The power supply path switching circuit includes a voltage acquisition circuit, a voltage regulator, and a voltage comparator. The input terminal of the voltage acquisition circuit is connected to the battery, and the output terminal of the voltage acquisition circuit is connected to the positive input terminal of the voltage comparator. The input terminal of the voltage regulator is connected to the battery, and the output terminal of the voltage regulator is connected to the negative input terminal of the voltage comparator. The output terminal of the voltage comparator is connected to the switching module. The voltage acquisition circuit provides a detection voltage for the voltage comparator, and the voltage regulator provides a reference voltage for the voltage comparator. The voltage comparator is used to output a turn-off signal when the detected voltage is greater than or equal to the reference voltage, and to output a turn-on signal when the detected voltage is less than the reference voltage.

4. The chip power supply circuit according to claim 3, characterized in that, The voltage acquired by the voltage acquisition circuit is the power supply voltage of the battery, and the reference voltage provided by the voltage regulator to the voltage comparator is the preset operating voltage of the chip.

5. The chip power supply circuit according to claim 3, characterized in that, The voltage acquired by the voltage acquisition circuit is half of the supply voltage, and the reference voltage provided by the voltage regulator to the voltage comparator is half of the preset operating voltage of the chip.

6. The chip power supply circuit according to claim 5, characterized in that, The voltage acquisition circuit includes a first resistor and a second resistor with the same resistance value. The first end of the first resistor is connected to the battery, and the second end of the first resistor is connected to the first end of the second resistor and the positive input terminal of the voltage comparator. The second end of the second resistor is grounded.

7. The chip power supply circuit according to claim 1, characterized in that, The switching module includes a field-effect transistor.

8. The chip power supply circuit according to claim 3, characterized in that, The voltage regulator has a filter capacitor connected to its input and output terminals respectively.

9. The chip power supply circuit according to claim 3, characterized in that, A current-limiting resistor is connected between the first and third terminals of the switching module. The first terminal of the switching module is connected to the positive terminal of the voltage divider diode, and the third terminal of the switching module is connected to the output terminal of the voltage comparator.

10. An electronic circuit, characterized in that, The electronic circuit includes an electrically connected chip and a chip power supply circuit as described in any one of claims 1-9.

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