Switching circuit, device and direct current servo driver based on DCDC power output

Abstract

The utility model relates to power supply technology field especially relates to a switching circuit, device and direct current servo driver based on DCDC power output, the circuit includes voltage acquisition module, microcontroller, switch module, voltage regulation module and voltage conversion module. Voltage acquisition module gathers the bus voltage and converts into electric signal transmission to microcontroller, microcontroller judges input range according to electric signal voltage value: if in first preset voltage range, output first electric signal to switch module, and the power supply circuit of DCDC power supply and voltage regulation module are turned on, voltage regulation module is adjusted to reference voltage, and drive voltage is output to drive chip through voltage conversion module after adjustment, if in second preset voltage range, output second electric signal to switch module, disconnect the power supply circuit, voltage conversion module directly converts reference voltage, and output drive voltage, realize the adaptive voltage output under the wide voltage input.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a switching circuit, device and DC servo driver based on DC-DC power output. Background Technology

[0002] In the power supply system of a DC servo driver, the power supply design of the three-phase drive chip is crucial to the system efficiency and reliability. The three-phase drive chip is used to drive three-phase bridge MOSFETs, and its output gate-source (GS) drive voltage directly affects the switching losses of the MOSFETs: within the allowable power supply range of the drive chip, the higher the supply voltage (e.g., 15V), the larger the GS drive voltage of the MOSFETs, the faster the switching process, the less heat generated, and the higher the system energy efficiency.

[0003] However, current DC servo drivers on the market cannot adapt to a wide range of input voltages, typically 10–100V. For example, when the input voltage is in a high-voltage scenario (e.g., 18–100V), a DC-DC buck converter can stably output 15V, meeting the optimal power supply requirements of the driver chip and effectively reducing MOSFET heat generation. However, in low-voltage scenarios (e.g., 10–17V), the output voltage of the DC-DC buck converter is limited by the input voltage and cannot output 15V, resulting in current DC servo drivers being unable to adapt to a wide range of input voltages. Utility Model Content

[0004] The main purpose of this utility model is to provide a switching circuit, device and DC servo driver based on DC-DC power output, which aims to solve the technical problem that the three-phase drive chip of the DC servo driver on the market cannot adapt to a wide range of input voltages.

[0005] To achieve the above objectives, this utility model provides a switching circuit based on DC-DC power output, the circuit comprising: a voltage acquisition module, a microcontroller, a switching module, a voltage regulation module, and a voltage conversion module;

[0006] The voltage acquisition module is connected to the microcontroller, the microcontroller is connected to the switching module, the switching module is connected to the DC-DC power supply and the voltage regulation module, the voltage regulation module is connected to the voltage conversion module, and the voltage conversion module is connected to the DC-DC power supply and the driver chip.

[0007] The voltage acquisition module is used to acquire the bus voltage and convert the bus voltage into a corresponding electrical signal and output it to the microcontroller;

[0008] The microcontroller is configured to output a first electrical signal to the switching module when the voltage value of the electrical signal is within a first preset voltage range, and to output a second electrical signal to the switching module when the voltage value of the electrical signal is within a second preset voltage range, wherein the lower limit of the first preset voltage range is greater than the upper limit of the second preset voltage range;

[0009] The switching module is used to turn on the power supply circuit between the DC-DC power supply and the voltage regulation module when receiving the first electrical signal, and to turn off the power supply circuit between the DC-DC power supply and the voltage regulation module when receiving the second electrical signal.

[0010] The voltage regulation module is used to adjust the reference voltage output by the DC-DC power supply when the power supply circuit is turned on, and output the adjusted reference voltage to the voltage conversion module.

[0011] The voltage conversion module is used to convert the adjusted reference voltage and output the driving voltage corresponding to the first preset voltage range to the driving chip, or when the power supply circuit is disconnected, to convert the reference voltage output by the DC-DC power supply and output the driving voltage corresponding to the second preset voltage range to the driving chip. The driving chip is used to drive the three-phase bridge MOSFET.

[0012] Optionally, the switching module includes: a first resistor, a second resistor, and a first switching transistor;

[0013] Wherein, the first end of the first resistor is connected to the microcontroller, the second end of the first resistor is connected to the first end of the second resistor and the control terminal of the first switching transistor, the second end of the second resistor is grounded, the output terminal of the first switching transistor is grounded, and the input terminal of the first switching transistor is connected to the voltage regulation module.

[0014] Optionally, the voltage conversion module includes: a third resistor and a fourth resistor;

[0015] The first end of the third resistor is connected to the driver chip, the second end of the third resistor is connected to the DC-DC power supply, the first end of the fourth resistor and the voltage regulation module, and the second end of the fourth resistor is grounded.

[0016] Optionally, the voltage regulation module includes: a fifth resistor;

[0017] The first end of the fifth resistor is connected to the first end of the fourth resistor and the second end of the third resistor, and the second end of the fifth resistor is connected to the input end of the first switching transistor.

[0018] Optionally, the DC-DC power supply includes: a DC-DC step-down chip, a sixth resistor, a first capacitor, a second capacitor, a first diode, and a first inductor;

[0019] In this configuration, the current limiting detection terminal of the DC-DC step-down chip is connected to the first terminal of the sixth resistor. The second terminal of the sixth resistor is connected to the switching output terminal of the DC-DC step-down chip, the second terminal of the first inductor, the cathode of the first diode, and the second terminal of the first capacitor. The first terminal of the first capacitor is connected to the bootstrap terminal of the DC-DC step-down chip. The anode of the first diode is grounded. The second terminal of the first inductor is connected to the first terminal of the second capacitor, the driver chip, and the second terminal of the third resistor. The voltage feedback terminal of the DC-DC step-down chip is connected to the second terminal of the second capacitor, the first terminal of the third resistor, and the first terminal of the fourth resistor.

[0020] Optionally, the voltage acquisition module includes: a filtering unit and a voltage divider unit;

[0021] The filtering unit is connected to the voltage divider unit, and the voltage divider unit is connected to the microcontroller.

[0022] The filtering unit is used to collect the bus voltage, filter the bus voltage, and transmit the filtered bus voltage to the voltage divider unit.

[0023] The voltage divider unit is used to divide the filtered bus voltage to obtain an electrical signal corresponding to the bus voltage, which is then output to the microcontroller.

[0024] Optionally, the filtering unit includes: a third capacitor;

[0025] The first terminal of the third capacitor is connected to the voltage divider unit and the bus, respectively, and the second terminal of the third capacitor is grounded.

[0026] Optionally, the voltage divider unit includes: a seventh resistor, an eighth resistor, and a ninth resistor;

[0027] The first end of the seventh resistor is connected to the first end of the third capacitor and the first end of the eighth resistor, the second end of the seventh resistor is grounded, the second end of the eighth resistor is connected to the first end of the ninth resistor, and the second end of the ninth resistor is connected to the microcontroller.

[0028] In addition, to achieve the above objectives, this utility model also proposes a switching device based on DC-DC power output, which includes the switching circuit based on DC-DC power output described above.

[0029] In addition, to achieve the above objectives, this utility model also proposes a DC servo driver, which includes the switching circuit based on DC-DC power output described above.

[0030] The switching circuit based on DC-DC power supply output in this invention includes: a voltage acquisition module, a microcontroller, a switching module, a voltage regulation module, and a voltage conversion module; wherein, the voltage acquisition module is connected to the microcontroller, the microcontroller is connected to the switching module, the switching module is connected to both the DC-DC power supply and the voltage regulation module, the voltage regulation module is connected to the voltage conversion module, and the voltage conversion module is connected to both the DC-DC power supply and the driver chip; the voltage acquisition module is used to acquire the bus voltage and convert the bus voltage into a corresponding electrical signal, which is then output to the microcontroller; the microcontroller is used to output a first electrical signal to the switching module when the voltage value of the electrical signal is within a first preset voltage range, and to output a second electrical signal to the switching module when the voltage value of the electrical signal is within a second preset voltage range, wherein the first preset voltage range... The lower limit is greater than the upper limit of the second preset voltage range; the switching module is used to turn on the power supply circuit between the DC-DC power supply and the voltage regulation module when receiving the first electrical signal, and to turn off the power supply circuit between the DC-DC power supply and the voltage regulation module when receiving the second electrical signal; the voltage regulation module is used to adjust the reference voltage output by the DC-DC power supply when the power supply circuit is turned on, and output the adjusted reference voltage to the voltage conversion module; the voltage conversion module is used to convert the adjusted reference voltage and output the driving voltage corresponding to the first preset voltage range to the driving chip, or to convert the reference voltage output by the DC-DC power supply and output the driving voltage corresponding to the second preset voltage range to the driving chip when the power supply circuit is turned off, and the driving chip is used to drive the three-phase bridge MOSFET. This utility model uses a microcontroller to determine the input voltage range and dynamically switch the power supply circuit to achieve adaptive voltage output under wide voltage input, ensuring that the driving chip can provide the optimal driving voltage in different scenarios, reducing the heating of the three-phase bridge MOSFET, and improving system efficiency and reliability. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the first embodiment of the switching circuit based on DC-DC power output of this utility model;

[0032] Figure 2 This is a schematic diagram of the second embodiment of the switching circuit based on DC-DC power output of this utility model;

[0033] Figure 3This is a circuit diagram of the voltage sampling module in the switching circuit based on DC-DC power supply output of this utility model;

[0034] Figure 4 This is a circuit diagram of the voltage conversion module, voltage regulation module, and switching module in the switching circuit based on DC-DC power output of this utility model.

[0035] Explanation of icon numbers:

[0036] 10 Voltage acquisition module 20 microcontroller 30 Switch module 40 Voltage regulation module 50 Voltage conversion module 101 Filtering unit 102 Voltage divider unit U1 DCDC step-down chip R1~R9 First resistor to ninth resistor C1~C3 First capacitor to third capacitor D1 First diode L1 First Inductor Q1 First switching transistor ILIM Current limiting detection terminal SW Switch output terminal BST Self-bootstrapping FB Voltage feedback terminal

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application.

[0042] This utility model embodiment provides a switching circuit based on DC-DC power supply output, referring to... Figure 1 As shown, Figure 1 This is a structural block diagram of the first embodiment of the switching circuit based on DC-DC power output of this utility model. The switching circuit based on DC-DC power output of this utility model includes: a voltage acquisition module 10, a microcontroller 20, a switching module 30, a voltage regulation module 40, and a voltage conversion module 50;

[0043] The voltage acquisition module 10 is connected to the microcontroller 20, the microcontroller 20 is connected to the switch module 30, the switch module 30 is connected to the DC-DC power supply and the voltage regulation module 40, the voltage regulation module 40 is connected to the voltage conversion module 50, and the voltage conversion module 50 is connected to the DC-DC power supply and the driver chip.

[0044] It should be noted that the voltage acquisition module 10 is used to acquire the input bus voltage of the DC servo driver in real time. The bus voltage can be a wide voltage range of 10 to 100V. Through voltage divider and filtering circuits, the bus voltage is converted into an electrical signal that the microcontroller 20 can recognize, such as a 0 to 3.3V voltage signal, and transmitted to the analog-to-digital converter (ADC) pin of the microcontroller 20. The voltage acquisition module 10 provides the microcontroller 20 with real-time status data of the input voltage and is the signal input terminal for the system to realize voltage adaptive switching.

[0045] Specifically, refer to Figure 2 The voltage acquisition module 10 includes: a filtering unit 101 and a voltage divider unit 102;

[0046] The filtering unit 101 is connected to the voltage divider unit 102, and the voltage divider unit 102 is connected to the microcontroller 20. The filtering unit 101 is used to acquire the bus voltage, filter the bus voltage, and transmit the filtered bus voltage to the voltage divider unit 102. The voltage divider unit 102 is used to divide the filtered bus voltage to obtain an electrical signal corresponding to the bus voltage, which is then output to the microcontroller 20.

[0047] Furthermore, referring to Figure 3The filter unit 101 may include a third capacitor C3; the first terminal of the third capacitor C3 is connected to the voltage divider unit 102 and the bus, and the second terminal of the third capacitor C3 is grounded. The voltage divider unit 102 may include a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9; wherein, the first terminal of the seventh resistor R7 is connected to the first terminal of the third capacitor C3 and the first terminal of the eighth resistor R8, the second terminal of the seventh resistor R7 is grounded, the second terminal of the eighth resistor R8 is connected to the first terminal of the ninth resistor R9, and the second terminal of the ninth resistor R9 is connected to the microcontroller 20.

[0048] The microcontroller 20 receives electrical signals from the voltage acquisition module 10, determines the current input voltage scenario based on preset voltage thresholds, and outputs corresponding control signals to the switching module 30. The preset voltage thresholds may include a first preset voltage range of 18–100V and a second preset voltage range of 10–17V. The control signals can be either a first electrical signal or a second electrical signal, which can be represented by high or low voltage levels. Therefore, the microcontroller 20 can dynamically generate control logic based on the input voltage range to drive the switching module 30 to execute voltage switching strategies.

[0049] The switching module 30 may include switching elements such as transistors and MOSFETs, which turn the power supply circuit between the DC-DC power supply and the voltage regulation module 40 on or off according to the control signal from the microcontroller 20. When the input voltage is in a high-voltage scenario, i.e., within the first preset range, the microcontroller 20 outputs a first electrical signal, such as a low level, and the switching module 30 turns on, connecting to the voltage regulation module 40. When the input voltage is in a low-voltage scenario, i.e., within the second preset range, it outputs a second electrical signal, such as a high level, and the switching module 30 disconnects the bypass voltage regulation module 40. Therefore, the switching module 30 realizes the dynamic connection of the voltage regulation module 40 through on / off control, and serves as a bridge connecting the microcontroller 20's decision-making and circuit hardware switching.

[0050] The voltage regulation module 40 operates only when the switching module 30 is on. It adjusts the reference voltage of the DC-DC power supply via a resistor divider network, such as adjusting the reference voltage from its default value to a target value suitable for high-voltage scenarios, providing the voltage conversion module 50 with an regulated reference signal. The resistor divider network can be a parallel feedback resistor. When high voltage is input, the voltage regulation module 40 adjusts the feedback parameters of the DC-DC power supply to ensure that the voltage conversion module 50 outputs the optimal voltage required by the driver chip, such as 15V, reducing MOSFET heat generation.

[0051] The voltage conversion module 50 can achieve voltage conversion based on the reference voltage of the DC-DC power supply through a feedback control circuit. When the switching module 30 is turned on, i.e., in a high-voltage scenario, it receives the adjusted reference voltage from the voltage regulation module 40 and outputs a high-voltage adapted drive voltage (e.g., 15V) to the driver chip. When the switching module 30 is turned off, i.e., in a low-voltage scenario, it directly converts based on the default reference voltage of the DC-DC power supply and outputs a low-voltage adapted drive voltage, such as 8.125V. The voltage conversion module 50 dynamically generates a voltage that meets the requirements of the driver chip according to the control strategy of the front-end module, ensuring that the three-phase bridge MOSFETs can obtain a reasonable gate-source drive voltage under different input scenarios.

[0052] Furthermore, referring to Figure 4 The switching module 30 may include: a first resistor R1, a second resistor R2, and a first switching transistor Q1; wherein, the first end of the first resistor R1 is connected to the microcontroller 20, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the control terminal of the first switching transistor Q1, the second end of the second resistor R2 is grounded, the output terminal of the first switching transistor Q1 is grounded, and the input terminal of the first switching transistor Q1 is connected to the voltage regulation module 40.

[0053] The voltage conversion module 50 may include a third resistor R3 and a fourth resistor R4; wherein, the first end of the third resistor R3 is connected to the driver chip, the second end of the third resistor R3 is connected to the DC-DC power supply, the first end of the fourth resistor R4 and the voltage regulation module 40 respectively, and the second end of the fourth resistor R4 is grounded.

[0054] The voltage regulation module 40 may include: a fifth resistor R5; the first end of the fifth resistor R5 is connected to the first end of the fourth resistor R4 and the second end of the third resistor R3, and the second end of the fifth resistor R5 is connected to the input end of the first switch Q1.

[0055] The DC-DC power supply may include: a DC-DC step-down chip U1, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a first diode D1, and a first inductor L1; wherein, the current limiting detection terminal ILIM of the DC-DC step-down chip U1 is connected to the first terminal of the sixth resistor R6, the second terminal of the sixth resistor R6 is connected to the switching output terminal SW of the DC-DC step-down chip U1, the second terminal of the first inductor L1, the cathode of the first diode D1, and the second terminal of the first capacitor C1, the first terminal of the first capacitor C1 is connected to the bootstrap terminal BST of the DC-DC step-down chip U1, the anode of the first diode D1 is grounded, the second terminal of the first inductor L1 is connected to the first terminal of the second capacitor C2, the driver chip, and the second terminal of the third resistor R3, and the voltage feedback terminal FB of the DC-DC step-down chip U1 is connected to the second terminal of the second capacitor C2, the first terminal of the third resistor R3, and the first terminal of the fourth resistor R4.

[0056] It should be noted that the DC-DC step-down chip U1 can be model SL3041H, and the reference voltage output from the voltage feedback terminal FB of the DC-DC step-down chip U1 can be 1.25V. The resistance value of the third resistor R3 can be 11K, the resistance value of the fourth resistor R4 can be 2K, and the resistance value of the fifth resistor R5 can be 2K. In a specific embodiment, when the voltage sampling module detects that the bus voltage is 18~100V, the microcontroller 20 outputs a high level to the control terminal of the first switch Q1, and the first switch Q1 conducts the feedback loop power supply connection. The fifth resistor R5 can be connected in series as a feedback resistor in the feedback loop, and the first switch Q1 can be an NMOS transistor. At this time, the driving voltage V out The calculation formula is:

[0057]

[0058] In the formula, V fb This is the reference voltage output from the voltage feedback terminal FB of the DC-DC step-down chip U1. V fb Substituting R3 = 1.25V, R4 = 11K, R5 = 2K into the above calculation formula, the driving voltage V is obtained. out =15V, which is the driving voltage corresponding to the driver chip when the bus voltage is 18~100V.

[0059] When the voltage sampling module detects that the bus voltage is 10-17V, the microcontroller 20 outputs a low level to the control terminal of the first switch Q1, and the first switch Q1 is not turned on to power the feedback loop. At this time, the drive voltage V out The calculation formula is:

[0060]

[0061] V fb Substituting R3 = 1.25V, R4 = 11K, and R3 = 2K into the above calculation formula, the driving voltage V is obtained. out =8.125V, which is the driving voltage of the driver chip when the bus voltage is 10~17V.

[0062] It should be understood that when the bus voltage is 18-100V, 15V is output to the driver chip to reduce the heat generation of the three-phase bridge MOSFETs; when the bus voltage is 10-17V, 8.125V is output to the driver chip, which also enables the three-phase bridge MOSFETs to work normally. Therefore, this implementation can adapt to a wide voltage input.

[0063] In this embodiment, the voltage acquisition module 10 acquires the bus voltage and converts it into a corresponding electrical signal, which is then output to the microcontroller 20. When the voltage value of the electrical signal is within a first preset voltage range, the microcontroller 20 outputs a first electrical signal to the switching module 30; when the voltage value of the electrical signal is within a second preset voltage range, it outputs a second electrical signal to the switching module 30, wherein the lower limit of the first preset voltage range is greater than the upper limit of the second preset voltage range. Upon receiving the first electrical signal, the switching module 30 connects the power supply circuit between the DC-DC power supply and the voltage regulation module 40; upon receiving the second electrical signal... When the power supply circuit between the DC-DC power supply and the voltage regulation module 40 is open, the voltage regulation module 40 adjusts the reference voltage output by the DC-DC power supply and outputs the adjusted reference voltage to the voltage conversion module 50. The voltage conversion module 50 converts the adjusted reference voltage and outputs the driving voltage corresponding to the first preset voltage range to the driving chip. Alternatively, when the power supply circuit is open, it converts the reference voltage output by the DC-DC power supply and outputs the driving voltage corresponding to the second preset voltage range to the driving chip. The driving chip is used to drive the three-phase bridge MOSFETs. In this embodiment, the microcontroller 20 determines the input voltage range and dynamically switches the power supply circuit to achieve adaptive voltage output under wide voltage input, ensuring that the driving chip can provide the optimal driving voltage in different scenarios, reducing the heat generation of the three-phase bridge MOSFETs, and improving system efficiency and reliability.

[0064] Furthermore, to achieve the above objectives, this utility model also proposes a switching device based on DC-DC power output, which includes the DC-DC power output switching circuit described above. The specific structure of this DC-DC power output switching circuit is as described in the above embodiments. Since this DC-DC power output switching device adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0065] Furthermore, to achieve the above objectives, this utility model also proposes a DC servo driver, which includes the switching circuit based on DC-DC power output described above. The specific structure of this DC-DC power output switching circuit is as described in the above embodiments. Since this DC servo driver adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated further here.

[0066] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A switching circuit based on the output of a DC-DC power supply, characterized in that, The circuit includes: a voltage acquisition module, a microcontroller, a switching module, a voltage regulation module, and a voltage conversion module; The voltage acquisition module is connected to the microcontroller, the microcontroller is connected to the switching module, the switching module is connected to the DC-DC power supply and the voltage regulation module, the voltage regulation module is connected to the voltage conversion module, and the voltage conversion module is connected to the DC-DC power supply and the driver chip. The voltage acquisition module is used to acquire the bus voltage and convert the bus voltage into a corresponding electrical signal and output it to the microcontroller; The microcontroller is configured to output a first electrical signal to the switching module when the voltage value of the electrical signal is within a first preset voltage range, and to output a second electrical signal to the switching module when the voltage value of the electrical signal is within a second preset voltage range, wherein the lower limit of the first preset voltage range is greater than the upper limit of the second preset voltage range; The switching module is used to turn on the power supply circuit between the DC-DC power supply and the voltage regulation module when receiving the first electrical signal, and to turn off the power supply circuit between the DC-DC power supply and the voltage regulation module when receiving the second electrical signal. The voltage regulation module is used to adjust the reference voltage output by the DC-DC power supply when the power supply circuit is turned on, and output the adjusted reference voltage to the voltage conversion module. The voltage conversion module is used to convert the adjusted reference voltage and output the driving voltage corresponding to the first preset voltage range to the driving chip, or when the power supply circuit is disconnected, to convert the reference voltage output by the DC-DC power supply and output the driving voltage corresponding to the second preset voltage range to the driving chip. The driving chip is used to drive the three-phase bridge MOSFET.

2. The switching circuit based on a DCDC power supply output according to claim 1, characterized in that, The switching module includes: a first resistor, a second resistor, and a first switching transistor; Wherein, the first end of the first resistor is connected to the microcontroller, the second end of the first resistor is connected to the first end of the second resistor and the control terminal of the first switching transistor, the second end of the second resistor is grounded, the output terminal of the first switching transistor is grounded, and the input terminal of the first switching transistor is connected to the voltage regulation module.

3. The switching circuit based on a DCDC power supply output according to claim 2, characterized in that, The voltage conversion module includes: a third resistor and a fourth resistor; The first end of the third resistor is connected to the driver chip, the second end of the third resistor is connected to the DC-DC power supply, the first end of the fourth resistor and the voltage regulation module, and the second end of the fourth resistor is grounded.

4. The switching circuit based on a DCDC power supply output according to claim 3, characterized in that, The voltage regulation module includes: a fifth resistor; The first end of the fifth resistor is connected to the first end of the fourth resistor and the second end of the third resistor, and the second end of the fifth resistor is connected to the input end of the first switching transistor.

5. The switching circuit based on a DCDC power supply output according to claim 4, characterized in that, The DC-DC power supply includes: a DC-DC step-down chip, a sixth resistor, a first capacitor, a second capacitor, a first diode, and a first inductor; In this configuration, the current limiting detection terminal of the DC-DC step-down chip is connected to the first terminal of the sixth resistor. The second terminal of the sixth resistor is connected to the switching output terminal of the DC-DC step-down chip, the second terminal of the first inductor, the cathode of the first diode, and the second terminal of the first capacitor. The first terminal of the first capacitor is connected to the bootstrap terminal of the DC-DC step-down chip. The anode of the first diode is grounded. The second terminal of the first inductor is connected to the first terminal of the second capacitor, the driver chip, and the second terminal of the third resistor. The voltage feedback terminal of the DC-DC step-down chip is connected to the second terminal of the second capacitor, the first terminal of the third resistor, and the first terminal of the fourth resistor.

6. The switching circuit based on a DCDC power supply output according to claim 1, wherein, The voltage acquisition module includes: a filtering unit and a voltage divider unit; The filtering unit is connected to the voltage divider unit, and the voltage divider unit is connected to the microcontroller. The filtering unit is used to collect the bus voltage, filter the bus voltage, and transmit the filtered bus voltage to the voltage divider unit. The voltage divider unit is used to divide the filtered bus voltage to obtain an electrical signal corresponding to the bus voltage, which is then output to the microcontroller.

7. The switching circuit based on a DCDC power supply output according to claim 6, characterized in that, The filtering unit includes: a third capacitor; The first terminal of the third capacitor is connected to the voltage divider unit and the bus, respectively, and the second terminal of the third capacitor is grounded.

8. The switching circuit based on a DCDC power supply output according to claim 7, characterized in that, The voltage divider unit includes: a seventh resistor, an eighth resistor, and a ninth resistor; The first end of the seventh resistor is connected to the first end of the third capacitor and the first end of the eighth resistor, the second end of the seventh resistor is grounded, the second end of the eighth resistor is connected to the first end of the ninth resistor, and the second end of the ninth resistor is connected to the microcontroller.

9. A switching device based on the output of a DC-DC power supply, characterized in that The switching device based on DC-DC power output includes the switching circuit based on DC-DC power output as described in any one of claims 1 to 8.

10. A DC servo drive, characterized by The DC servo driver includes a switching circuit based on DC-DC power output as described in any one of claims 1 to 8.

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