Step-down circuit

Abstract

The utility model relates to a step-down circuit. The step-down circuit comprises a voltage conversion module and an anti-interference module, the input end of the voltage conversion module is electrically connected with the power supply module, the first end of the voltage conversion module is electrically connected with the reference voltage module through the anti-interference module, and the second end of the voltage conversion module is grounded through the anti-interference module; wherein the voltage conversion module is used for converting power supply voltage provided by the power supply module into first voltage required by the reference voltage module, and the anti-interference module is used for filtering interference voltage generated in the process that the voltage conversion module provides the first voltage for the reference voltage module. According to the step-down circuit provided by the invention, the stable first voltage is output through the anti-interference module, and the internal circuit of the reference voltage module is prevented from being damaged by abnormal voltage. And the circuit modules required in the step-down circuit are fewer, so that the power density of the whole energy storage system can be improved while the area of a PCB (Printed Circuit Board) in the energy storage system is reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic technologies, and particularly to a buck circuit. Background Art

[0002] In an energy storage system, a reference voltage circuit is one of the important components. The voltage provided by the reference voltage circuit is the reference for the sampling circuit. Only when the reference voltage collected by the sampling circuit meets the requirements can the energy storage system operate normally.

[0003] In the prior art, the power supply module and the reference voltage circuit are usually set independently. When the energy storage system is in a high-power working environment, there is high-frequency interference to the reference voltage circuit, which will cause fluctuations in the reference voltage output by the reference voltage circuit, and further lead to failures or stoppages of the energy storage system. Summary of the Utility Model

[0004] To solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a buck circuit.

[0005] The present disclosure provides a buck circuit, including: a voltage conversion module and an anti-interference module; the input end of the voltage conversion module is electrically connected to the power supply module, the first end of the voltage conversion module is electrically connected to the reference voltage module through the anti-interference module, and the second end of the voltage conversion module is grounded through the anti-interference module; wherein, the voltage conversion module is used to convert the power supply voltage provided by the power supply module into the first voltage required by the reference voltage module, and the anti-interference module is used to filter out the interference voltage generated during the process of the voltage conversion module providing the first voltage to the reference voltage module.

[0006] Optionally, the anti-interference module includes a first magnetic bead and a second magnetic bead; the first end of the voltage conversion module is electrically connected to the reference voltage module through the first magnetic bead, and the second end of the voltage conversion module is grounded through the second magnetic bead.

[0007] Optionally, the voltage conversion module includes a buck chip; the input end and the power supply end of the buck chip are electrically connected to the power supply module, the output end of the buck chip is electrically connected to the reference voltage module through the anti-interference module, and the ground end of the buck chip is grounded; the buck chip is used to convert the power supply voltage provided by the power supply module into the first voltage required by the reference voltage module.

[0008] Optionally, the buck chip includes a voltage feedback end, and the voltage conversion module further includes a first resistor, a second resistor, and a third resistor; the voltage feedback end of the buck chip is electrically connected to the output end of the buck chip through the first resistor and the second resistor, and the voltage feedback end of the buck chip is also grounded through the first resistor and the third resistor; the voltage feedback end is used to detect whether the voltage value output by the output end of the buck chip meets the voltage value of the first voltage.

[0009] Optionally, the step-down chip includes an interference cancellation terminal, and the voltage conversion module further includes a fourth resistor and a first capacitor; the interference cancellation terminal of the step-down chip is electrically connected to the output terminal of the step-down chip through the fourth resistor and the first capacitor; the interference cancellation terminal is used to reduce the interference voltage in the first voltage output by the output terminal of the step-down chip.

[0010] Optionally, the step-down chip includes an enable terminal, and the voltage conversion module further includes a first current-limiting resistor and a second current-limiting resistor; the enable terminal of the step-down chip is electrically connected to the power supply module through the first current-limiting resistor, and the enable terminal of the step-down chip is also grounded through the second current-limiting resistor.

[0011] Optionally, the step-down circuit further includes a first inductor; the first end of the voltage conversion module is electrically connected to the anti-interference module through the first inductor.

[0012] Optionally, the step-down circuit further includes a filtering module; the first end of the filtering module is electrically connected to the power supply module, the second end of the filtering module is electrically connected to the input end of the voltage conversion module, and the third end of the filtering module is grounded.

[0013] Optionally, the filtering module includes a filtering unit, a second capacitor, a third capacitor, and a fourth capacitor; the first end of the filtering unit and the first end of the second capacitor are both electrically connected to the power supply module, the second end of the filtering unit is electrically connected to the first end of the third capacitor and the first end of the fourth capacitor, and the second end of the second capacitor, the second end of the third capacitor, and the second end of the fourth capacitor are all grounded.

[0014] Optionally, the step-down circuit further includes an electrolytic capacitor, the positive electrode end of the electrolytic capacitor is electrically connected to the first end of the voltage conversion module, and the negative electrode end of the electrolytic capacitor is electrically connected to the second end of the voltage conversion module.

[0015] The present disclosure provides a step-down circuit. A voltage conversion module and an anti-interference module are provided between the power supply module and the reference voltage circuit. The voltage conversion module can convert the power supply voltage provided by the power supply module into the first voltage required by the reference voltage module, and the reference voltage module can convert the received first voltage into a reference voltage. The anti-interference module is disposed between the voltage conversion module and the reference voltage module and can filter out the interference voltage in the first voltage, thereby outputting a first voltage with stable voltage, so as to ensure that the reference voltage output by the reference voltage module is also stable. Thus, the step-down circuit provided by the present disclosure can ensure the output of a stable first voltage while also ensuring that the internal circuit of the reference voltage module is not damaged by abnormal voltage. And the required circuit modules in the step-down circuit are fewer, which can reduce the area of the PCB circuit board in the energy storage system while improving the power density of the entire energy storage system. Description of the Drawings

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for use in the embodiments of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 The structural schematic diagram of a step-down circuit provided by an embodiment of the present disclosure.

[0018] Figure 2 The structural schematic diagram of a preferred step-down circuit provided by an embodiment of the present disclosure. Detailed implementation manners

[0019] The following will describe in detail the features and exemplary embodiments of various aspects of the present invention. In the following detailed description, many specific details are presented to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention.

[0020] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the embodiments in detail with reference to the accompanying drawings.

[0021] Figure 1 The structural schematic diagram of a step-down circuit provided by an embodiment of the present disclosure, as Figure 1 shown, the step-down circuit includes: a voltage conversion module 100 and an anti-interference module 200; the input terminal 101 of the voltage conversion module 100 is electrically connected to the power supply module 300, the first terminal 102 of the voltage conversion module 100 is electrically connected to the reference voltage module 400 through the anti-interference module 200, and the second terminal 103 of the voltage conversion module 100 is grounded through the anti-interference module 200; wherein, the voltage conversion module 100 is used to convert the power supply voltage provided by the power supply module 300 into the first voltage required by the reference voltage module 400, and the anti-interference module 200 is used to filter out the interference voltage generated during the process of the voltage conversion module providing the first voltage to the reference voltage module.

[0022] Exemplarily, for example, in an energy storage system that charges an energy storage battery through a power grid, the entire energy storage system can operate normally only when the voltage provided by the reference voltage module 400 meets the reference voltage value required by the sampling circuit. After the input terminal 101 of the voltage conversion module 100 receives the power supply voltage provided by the power supply module 300, the internal voltage conversion unit converts the 5V voltage into the first voltage required by the reference voltage module 400. The reference voltage module 400 can convert the received first voltage into a reference voltage. The anti-interference module 200 is disposed between the voltage conversion module 100 and the reference voltage module 400. Through the anti-interference module 200, the interference voltage existing in the transmission process of the first voltage can be filtered out, and thus a first voltage with stable voltage can be output. Since the first voltage received by the reference voltage module 400 is stable, it can be ensured that the reference voltage output by the reference voltage module 400 is also stable, so that the sampling circuit can collect a stable reference voltage. Thus, the buck circuit provided by the present disclosure realizes the output of a stable first voltage, so that the reference voltage output by the reference voltage module 400 is stable, and further enables the sampling circuit to collect a stable reference voltage, avoiding the situation that the sampling circuit wrongly controls the energy storage system to turn on or off due to the fluctuation of the collected reference voltage. At the same time, since the reference voltage is stable, it can also ensure that the internal circuit of the reference voltage module will not be damaged due to receiving an abnormal voltage. And the buck circuit provided by the present disclosure requires fewer circuit modules in the process of outputting the reference voltage and eliminating the interference of the reference voltage. Therefore, the area of the PCB circuit board in the energy storage system can be reduced, and at the same time, the power density of the entire energy storage system can be improved.

[0023] In some embodiments, the anti-interference module includes a first bead and a second bead; the first end of the voltage conversion module is electrically connected to the reference voltage module through the first bead, and the second end of the voltage conversion module is grounded through the second bead.

[0024] Specifically, after the voltage conversion module converts the power supply voltage provided by the power supply module into the first voltage, it outputs to the reference voltage module through the first bead and the second bead. The first bead and the second bead can filter out the abnormal voltage fluctuations generated in the process of generating the first voltage, so that the reference voltage module receives a stable first voltage, thereby enabling the reference voltage module to generate a stable reference voltage based on the stable first voltage, and further enabling the sampling circuit to collect a stable reference voltage, avoiding the problem that the energy storage system operates abnormally due to the fluctuation of the collected reference voltage. Moreover, the filtering of the abnormal voltage fluctuations by the first bead and the second bead can also avoid the problem that the internal circuit structure of the reference voltage module is damaged due to the abnormal received voltage, realizing the protection of the reference voltage module.

[0025] In some embodiments, the voltage conversion module includes a buck chip; the input end of the buck chip and the power supply end of the buck chip are electrically connected to the power supply module, the output end of the buck chip is electrically connected to the reference voltage module through the anti-interference module, and the ground end of the buck chip is grounded; the buck chip is used to convert the supply voltage provided by the power supply module into a first voltage required by the reference voltage module.

[0026] Specifically, the power supply end of the buck chip is electrically connected to the power supply module to ensure the normal operation of the buck chip. The power supply module outputs the power supply voltage to the output end of the buck chip, and the buck chip converts the received power supply voltage into a first voltage through the internal chip structure, and outputs the first voltage to the reference voltage module through the output end of the buck chip, thereby realizing the conversion of the power supply voltage provided by the power supply module into the first voltage.

[0027] In some embodiments, the buck chip includes a voltage feedback end, and the voltage conversion module also includes a first resistor, a second resistor and a third resistor; the voltage feedback end of the buck chip is electrically connected to the output end of the buck chip through the first resistor and the second resistor, and the voltage feedback end of the buck chip is also grounded through the first resistor and the third resistor; the voltage feedback end is used to detect whether the voltage value output by the output end of the buck chip meets the voltage value of the first voltage.

[0028] Specifically, the output end of the buck chip is electrically connected to the voltage feedback end of the buck chip through the first resistor and the second resistor. By adjusting the resistance values ​​of the first resistor and the second resistor, the circuit bandwidth can be adjusted, so that the relevant circuit of the output end of the buck chip is stable. The output end of the buck chip is also grounded through the second resistor and the third resistor, so that the voltage feedback end of the buck chip receives the voltage after the voltage is divided by the first resistor, the second resistor and the third resistor. The voltage feedback end of the buck chip detects the received voltage. When it is detected that the voltage does not meet the voltage threshold, the buck chip adjusts the voltage output by the output end of the buck chip until the voltage detected by the voltage feedback end of the buck chip meets the voltage threshold. At this time, the voltage output by the output end of the buck chip meets the voltage value of the first voltage. Therefore, the present invention detects the voltage output by the buck chip through the voltage feedback terminal of the buck chip, and adjusts the output voltage through the internal preset logic, so that the final output voltage meets the required voltage value, and then after the output voltage passes through the anti-interference module, the reference voltage module can receive a stable and accurate first voltage, and finally output a stable and accurate reference voltage, thereby avoiding the problem that the energy storage system cannot work normally due to the collected voltage not meeting the reference voltage.

[0029] In some embodiments, the step-down chip includes an interference cancellation terminal, and the voltage conversion module further includes a fourth resistor and a first capacitor; the interference cancellation terminal of the step-down chip is electrically connected to the output terminal of the step-down chip through the fourth resistor and the first capacitor; the interference cancellation terminal is used to reduce the interference voltage in the first voltage output by the output terminal of the step-down chip.

[0030] Specifically, the first voltage output by the output terminal of the step-down chip is output to the interference cancellation terminal of the step-down chip after passing through the fourth resistor and the first capacitor. The fourth resistor is used to eliminate the spike voltage in the first voltage, and the first capacitor is used to generate a floating voltage. The interference cancellation terminal of the step-down chip receives the first voltage processed by the fourth resistor and the first capacitor, and detects the first voltage. If an interference voltage is detected in the first voltage, the interference voltage in the first voltage is eliminated through a preset logic inside the step-down chip, so that a stable first voltage is output by the output terminal of the step-down chip, and the interference existing after the first voltage passes through the peripheral circuit structure of the step-down chip is small, which is convenient for the anti-interference module to further eliminate the interference voltage in the first voltage.

[0031] In some embodiments, the step-down chip includes an enable terminal, and the voltage conversion module further includes a first current-limiting resistor and a second current-limiting resistor; the enable terminal of the step-down chip is electrically connected to the power supply module through the first current-limiting resistor, and the enable terminal of the step-down chip is also grounded through the second current-limiting resistor.

[0032] Specifically, the power supply module provides an enable level to the enable terminal of the step-down chip through the first current-limiting resistor. The first current-limiting resistor and the second current-limiting resistor are used to limit the current provided by the power supply module. Thus, in the present disclosure, the first current-limiting resistor and the second current-limiting resistor are provided to limit the current provided by the power supply module, so that after the enable terminal of the step-down chip receives the enable level, the step-down chip will not be damaged due to receiving a large current.

[0033] In some embodiments, the step-down circuit further includes a first inductor; the first end of the voltage conversion module is electrically connected to the anti-interference module through the first inductor.

[0034] Specifically, the first voltage output from the first terminal of the voltage conversion module is output to the anti-interference module after passing through the first inductor. The first inductor can filter the first voltage, filter out the clutter generated during the transmission of the first voltage, prevent the first voltage from mutating, so that the anti-interference module receives a relatively stable first voltage, and then the anti-interference module performs further interference elimination operations on the first voltage, so that the first voltage finally output to the reference voltage module is stable enough. Thus, the reference voltage module can generate a stable reference voltage based on the stable first voltage, and further enable the sampling circuit to collect a stable reference voltage, avoiding the problem that the energy storage system operates abnormally due to fluctuations in the collected reference voltage.

[0035] In some embodiments, the buck circuit further includes a filtering module; the first terminal of the filtering module is electrically connected to the power supply module, the second terminal of the filtering module is electrically connected to the input terminal of the voltage conversion module, and the third terminal of the filtering module is grounded.

[0036] Specifically, the power supply module inputs a supply voltage to the filtering module. After the supply voltage passes through the filtering operation of the filtering module, it is output from the second terminal of the filtering module to the input terminal of the voltage conversion module, thereby filtering out the interference voltage in the supply voltage output by the power supply module, so that the voltage conversion module receives a supply voltage with less interference, and thus the voltage conversion module can generate a first voltage with less interference and relatively stable based on the supply voltage with less interference. Then, the anti-interference module performs further interference elimination operations on the first voltage, so that the first voltage finally output to the reference voltage module is stable enough. Thus, the reference voltage module can generate a stable reference voltage based on the stable first voltage, and further enable the sampling circuit to collect a stable reference voltage, avoiding the problem that the energy storage system operates abnormally due to fluctuations in the collected reference voltage.

[0037] In some embodiments, the filtering module includes a filtering unit, a second capacitor, a third capacitor, and a fourth capacitor; the first terminal of the filtering unit and the first terminal of the second capacitor are both electrically connected to the power supply module, the second terminal of the filtering unit is electrically connected to the first terminal of the third capacitor and the first terminal of the fourth capacitor, and the second terminals of the second capacitor, the third capacitor, and the fourth capacitor are all grounded.

[0038] Exemplarily, the filtering unit is a filtering inductor, and the power supply voltage output by the power supply module completes the filtering operation through the filtering inductor. The first capacitor, the second capacitor, and the third capacitor are used to maintain the power supply voltage input to the power supply module and to absorb high-frequency switching noise, so as to make the finally output power supply voltage stable. The voltage conversion module generates a relatively stable first voltage based on the stable power supply voltage, and then the anti-interference module performs further interference elimination operation on the first voltage, so that the first voltage finally output to the reference voltage module is stable enough. Thus, the reference voltage module can generate a stable reference voltage based on the stable first voltage, and further, the sampling circuit can collect a stable reference voltage, avoiding the problem that the energy storage system operates abnormally due to fluctuations in the collected reference voltage.

[0039] In some embodiments, the buck circuit further includes an electrolytic capacitor. The positive terminal of the electrolytic capacitor is electrically connected to the first terminal of the voltage conversion module, and the negative terminal of the electrolytic capacitor is electrically connected to the second terminal of the voltage conversion module.

[0040] Specifically, the electrolytic capacitor is used to filter the first voltage output by the voltage conversion module, filter out the clutter existing in the process of outputting the first voltage to the anti-interference module, so that the anti-interference module receives a relatively stable first voltage, and then the anti-interference module performs further interference elimination operation on the first voltage, so that the first voltage finally output to the reference voltage module is stable enough.

[0041] Figure 2 The structural schematic diagram of a preferred buck circuit provided by an embodiment of the present disclosure is as Figure 2 shown. The buck circuit includes: a buck chip 110, a first bead L1, a second bead L2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first current-limiting resistor R5, a second current-limiting resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, an electrolytic capacitor C5, a first inductor L3, and a filtering inductor L4.

[0042] The power supply module 300 is electrically connected to the first end of the filter inductor L4. The second end of the filter inductor L4 is electrically connected to the input terminal 111 of the buck chip 110. The power supply module 300 is also electrically connected to the enable terminal 112 of the buck chip 110 through the first current-limiting resistor R5. The enable terminal 112 of the buck chip 110 is grounded through the second current-limiting resistor R6. The first end of the filter inductor L4 is electrically connected to the first end of the second capacitor C2. The second end of the filter inductor L4 is electrically connected to the first end of the third capacitor C3 and the first end of the fourth capacitor C4. The second ends of the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are all grounded. The output terminal 113 of the buck chip 110 is electrically connected to the first end of the first bead L1 through the first inductor L3. The second end of the first bead L1 is electrically connected to the reference voltage module 400. The output terminal 113 of the buck chip 110 is also electrically connected to the interference cancellation terminal 114 of the buck chip 110 through the fourth resistor R4 and the first capacitor C1. The first end of the first bead L1 is electrically connected to the interference cancellation terminal 115 of the buck chip 110 through the first resistor R1 and the second resistor R2. The interference cancellation terminal 115 of the buck chip 110 is grounded through the first resistor R1 and the third resistor R3. The interference cancellation terminal 115 of the buck chip 110 is also electrically connected to the first end of the second bead L2 through the first resistor R1 and the third resistor R3. The second end of the second bead L2 is grounded. The positive end of the electrolytic capacitor C5 is electrically connected to the first end of the first bead L1. The negative end of the electrolytic capacitor C5 is electrically connected to the first end of the second bead L2.

[0043] Specifically, the power supply voltage input by the power supply module 300 is output to the input terminal 111 of the buck chip 110 after passing through the filter inductor L4. The power supply voltage output by the power supply module 300 completes the filtering operation through the filter inductor L4. The first capacitor C1, the second capacitor C2, and the third capacitor C3 are used to maintain the power supply voltage input by the power supply module 300 and to absorb high-frequency switching noise, so as to make the finally output power supply voltage stable. The power supply module 300 also converts the power supply voltage into an enable level through the first current-limiting resistor R5 and outputs it to the enable terminal 112 of the buck chip 110, causing the buck chip 110 to start the buck operation.

[0044] The output terminal 113 of the step-down chip 110 outputs the stepped-down voltage. After passing through the first resistor R1, the second resistor R2, and the third resistor R3, the stepped-down voltage is output to the voltage feedback terminal 114 of the step-down chip 110. The voltage feedback terminal 114 of the step-down chip 110 detects the received voltage. When the detected voltage does not meet the voltage threshold, the step-down chip 110 adjusts the voltage output by the output terminal 113 of the step-down chip 110 until the voltage detected by the voltage feedback terminal 114 of the step-down chip 110 meets the voltage threshold. At this time, the voltage output by the output terminal 113 of the step-down chip 110 meets the voltage value of the first voltage. At the same time, the output terminal 113 of the step-down chip 110 also outputs the first voltage to the interference cancellation terminal 115 of the step-down chip 110. The first voltage reaches the interference cancellation terminal 115 of the step-down chip 110 after passing through the fourth resistor R4 and the first capacitor C1. The fourth resistor R4 is used to eliminate the spike voltage in the first voltage, and the first capacitor is used to generate a floating voltage. The interference cancellation terminal 115 of the step-down chip 110 receives the first voltage processed by the fourth resistor R4 and the first capacitor C1 and detects the first voltage. If an interference voltage is detected in the first voltage, the interference voltage in the first voltage is eliminated through the preset logic inside the step-down chip 110, so that the first voltage output by the output terminal 113 of the step-down chip 110 is stable. The first voltage output by the output terminal 113 of the step-down chip 110 is output to the reference voltage module 400 after passing through the first magnetic bead L1. The first magnetic bead L1 and the second magnetic bead L2 can filter out abnormal voltage fluctuations in the first voltage, so that the reference voltage module 400 can receive a stable first voltage. Thus, the reference voltage module 400 can generate a stable reference voltage based on the stable first voltage, and further enable the sampling circuit to collect a stable reference voltage, avoiding the problem that the energy storage system operates abnormally due to fluctuations in the collected reference voltage. Moreover, the filtering of abnormal voltage fluctuations by the first magnetic bead L1 and the second magnetic bead L2 can also avoid the problem that the internal circuit structure of the reference voltage module 400 is damaged due to abnormal received voltage, realizing the protection of the reference voltage module 400.

[0045] It should be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0046] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A step-down circuit, characterized in that: include: Voltage conversion module and anti-interference module; The input end of the voltage conversion module is electrically connected to the power supply module, the first end of the voltage conversion module is electrically connected to the reference voltage module through the anti-interference module, and the second end of the voltage conversion module is grounded through the anti-interference module; Among them, the voltage conversion module is used to convert the power supply voltage provided by the power supply module into the first voltage required by the reference voltage module, and the anti-interference module is used to filter out the interference voltage generated in the process of the voltage conversion module providing the first voltage to the reference voltage module.

2. The step-down circuit according to claim 1, characterized in that: The anti-interference module includes a first magnetic bead and a second magnetic bead; the first end of the voltage conversion module is electrically connected to the reference voltage module through the first magnetic bead, and the second end of the voltage conversion module is grounded through the second magnetic bead.

3. The step-down circuit according to claim 1, characterized in that: The voltage conversion module includes a step-down chip; The input end of the buck chip and the power supply end of the buck chip are electrically connected to the power supply module, the output end of the buck chip is electrically connected to the reference voltage module through the anti-interference module, and the ground end of the buck chip is grounded; the buck chip is used to convert the power supply voltage provided by the power supply module into a first voltage required by the reference voltage module.

4. The step-down circuit according to claim 3, characterized in that: The step-down chip includes a voltage feedback terminal, and the voltage conversion module also includes a first resistor, a second resistor and a third resistor; The voltage feedback end of the buck chip is electrically connected to the output end of the buck chip through the first resistor and the second resistor, and the voltage feedback end of the buck chip is also grounded through the first resistor and the third resistor; the voltage feedback end is used to detect whether the voltage value output by the output end of the buck chip meets the voltage value of the first voltage.

5. The step-down circuit according to claim 3, characterized in that: The step-down chip includes an interference elimination terminal, and the voltage conversion module also includes a fourth resistor and a first capacitor; The interference elimination end of the buck chip is electrically connected to the output end of the buck chip through the fourth resistor and the first capacitor; the interference elimination end is used to reduce the interference voltage in the first voltage output by the output end of the buck chip.

6. The step-down circuit according to claim 3, characterized in that: The step-down chip includes an enable terminal, and the voltage conversion module also includes a first current limiting resistor and a second current limiting resistor; The enable end of the buck chip is electrically connected to the power supply module through the first current limiting resistor, and the enable end of the buck chip is also grounded through the second current limiting resistor.

7. The step-down circuit according to any one of claims 1 to 6, characterized in that: It also includes a first inductor; the first end of the voltage conversion module is electrically connected to the anti-interference module through the first inductor.

8. The step-down circuit according to any one of claims 1 to 6, characterized in that: It also includes a filtering module; a first end of the filtering module is electrically connected to the power supply module, a second end of the filtering module is electrically connected to the input end of the voltage conversion module, and a third end of the filtering module is grounded.

9. The step-down circuit according to claim 8, characterized in that: The filtering module includes a filtering unit, a second capacitor, a third capacitor and a fourth capacitor; The first end of the filter unit and the first end of the second capacitor are electrically connected to the power supply module, the second end of the filter unit is electrically connected to the first end of the third capacitor and the first end of the fourth capacitor, and the second end of the second capacitor, the second end of the third capacitor and the second end of the fourth capacitor are all grounded.

10. The step-down circuit according to claim 1, characterized in that: It also includes an electrolytic capacitor, a positive terminal of the electrolytic capacitor is electrically connected to the first terminal of the voltage conversion module, and a negative terminal of the electrolytic capacitor is electrically connected to the second terminal of the voltage conversion module.

Images