Servo driver system with wide-range input voltage

Abstract

A servo driver system capable of inputting voltage in a wide range is characterized in that the servo driver system comprises an alternating current-direct current conversion circuit, the input end of a DC-DC voltage-boosting and voltage-regulating circuit is connected with the alternating current-direct current conversion circuit, the input end of an energy consumption braking circuit is connected with the output end of the DC-DC voltage-boosting and voltage-regulating circuit, the direct current-alternating current conversion circuit is connected to the output end of the energy consumption braking circuit, and the direct current-direct current conversion circuit is connected to the output end of the energy consumption braking circuit. And at least one servo driver is connected to the output DC-AC conversion circuit. When a servo driving system with wide-range input voltage is used, a user turns on a power supply, so that alternating current is input to the alternating current-direct current conversion circuit, and a stable voltage level is maintained through the DC-DC buck-boost circuit; when the servo motor slows down or stops, the energy consumption braking circuit consumes regenerated energy, the DC-DC voltage-boosting and voltage-regulating circuit regulates the grid voltage of the MOSFET tube through the error feedback circuit and the system to form a negative feedback closed loop, and the electric energy is stored in combination with an energy storage element on the DC-DC voltage-boosting and voltage-regulating circuit so as to keep the stability of the output voltage.

Description

Technical Field

[0001] The utility model relates to a servo drive system with a wide range of input voltage, belonging to the technical field of servo drive systems. Background Art

[0002] In the field of modern industrial automation and precision control, servo drives play a vital role. They achieve high-precision control of mechanical equipment by precisely controlling the speed, position, and torque of servo motors.

[0003] However, existing servo drive systems face technical challenges and limitations when dealing with input AC voltage fluctuations. The bus voltage of a servo drive typically relies on a stable input power supply. When the input AC voltage becomes unstable due to grid fluctuations, load changes, or other external factors, the bus voltage will also fluctuate. Such fluctuations can cause the servo drive to report low voltage or overvoltage faults, affecting system reliability and stability. Furthermore, frequent bus voltage fluctuations directly affect the control performance of the servo motor, thereby affecting the control accuracy and response speed of the entire system. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a servo drive system with a wide range of input voltage to solve the problem that the bus voltage of the existing servo drive fluctuates with the input AC voltage. When the input is too low or too high, the drive will report low voltage or overvoltage faults at best, and in serious cases, the servo drive will be directly burned out. At the same time, the bus voltage fluctuates frequently and significantly, which will affect the control effect of the servo motor.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solution: a servo drive system with a wide range of input voltage, comprising:

[0006] an AC-DC conversion circuit connected to a three-phase power input terminal, wherein the three-phase power input terminal is used to receive a three-phase AC power supply with a fixed voltage level and frequency;

[0007] A DC-DC buck-boost voltage regulating circuit, wherein the input end of the DC-DC buck-boost voltage regulating circuit is connected to the output end of the AC-DC conversion circuit;

[0008] An energy-consuming braking circuit, wherein the input end of the energy-consuming braking circuit is connected to the output end of the DC-DC buck-boost voltage regulating circuit;

[0009] a direct-to-alternating conversion circuit, wherein an input end of the direct-to-alternating conversion circuit is connected to an output end of the energy-consuming braking circuit;

[0010] A servo driver is connected to the output end of the direct-to-alternating conversion circuit, and there can be at least one servo driver.

[0011] Furthermore, the DC-DC buck-boost voltage regulation circuit includes at least two switching elements and three energy storage elements.

[0012] Furthermore, the switching element is specifically one of a MOSFET tube and an IGBT tube, and the energy storage element is an inductor or a capacitor.

[0013] Furthermore, the DC-DC buck-boost voltage regulation circuit includes a MOSFET tube Q1, a MOSFET tube Q2, a capacitor C1, a capacitor C2 and an inductor L1, the input end of the inductor L1 is connected to the positive electrode of the capacitor C1, the output end of the inductor L1 is connected to the gate and source of the MOSFET tube Q1, the drain of the MOSFET tube Q1 is connected to the positive electrode of the capacitor C2, the drain of the MOSFET tube Q2 is connected to the output end of the inductor L1, and the source and gate of the MOSFET tube Q2 are both connected to the negative electrodes of the capacitors C1 and C2.

[0014] Furthermore, the DC-DC buck-boost voltage regulation circuit includes a MOSFET tube Q3, a MOSFET tube Q4, a capacitor C3, a capacitor C4 and an inductor L2, the drain of the MOSFET tube Q3 is connected to the positive electrode of the capacitor C3, the source and gate of the MOSFET tube Q3 are connected to the drain of the MOSFET tube Q4, the source and gate of the MOSFET tube Q4 are connected to the positive electrode of the capacitor C4, the inductor L2 is connected in parallel with the capacitors C3 and C4, the input end of the inductor L2 is connected to the source and gate of the MOSFET tube Q3 and the drain of the MOSFET tube Q4, and the output end of the inductor L2 is connected to the negative electrodes of the capacitors C3 and C4.

[0015] Furthermore, the DC-DC buck-boost voltage regulation circuit includes a MOSFET tube Q5, a MOSFET tube Q6, a capacitor C5, a capacitor C6, a capacitor C7 and an inductor L3, the input end of the inductor L3 is connected to the positive electrode of the capacitor C5, the negative electrode of the inductor L3 is connected to the input end of the capacitor C7, the output end of the capacitor C7 is connected to the positive electrode of the capacitor C6, the MOSFET tube Q5, the MOSFET tube Q6 are connected in parallel with the capacitor C5 and the capacitor C6, the drain of the MOSFET tube Q5 is connected to the output end of the inductor L3 and the input end of the capacitor C7, the source and gate of the MOSFET tube Q6 are connected to the output end of the capacitor C7 and the positive electrode of the capacitor C6, and the source and gate of the MOSFET tube Q5 and the drain of Q6 are connected to the negative electrodes of the capacitors C5 and C6.

[0016] Furthermore, the DC-DC buck-boost voltage regulation circuit can process an input voltage range of 36V to 480V.

[0017] Furthermore, the gate voltage of the MOSFET tube is adjusted by a drive circuit, and the drive circuit receives a control signal from an error feedback circuit. The error feedback circuit samples from the output end of the MOSFET tube and compares the sampled value with a reference value through an operational amplifier inside the MOSFET tube. The comparison result is used to adjust the drive circuit, thereby changing the gate voltage of the MOSFET tube. If the output voltage is high, the gate voltage is reduced, the conduction degree of the MOSFET tube is reduced, and thus the output voltage is reduced, forming a negative feedback closed loop.

[0018] The beneficial effects of the present invention are: when using a servo drive system with a wide range of input voltage, the user needs to ensure that the input AC power voltage is within the acceptable range of the system before starting the system, and then turn on the power supply so that the AC power input is converted into DC power by the AC-DC conversion circuit, and a stable voltage level is maintained through the DC-DC buck-boost circuit; when the servo motor decelerates or stops, the energy-consuming braking circuit intervenes to consume regenerative energy to ensure system safety. The user needs to ensure that the control parameters of the driver are configured according to the requirements of the application, and pay attention to the performance of the DC-DC buck-boost voltage regulation circuit under different input voltages. Through the error feedback circuit, the system adjusts the gate voltage of the MOSFET tube to form a negative feedback closed loop, and combines the energy storage element on the DC-DC buck-boost voltage regulation circuit to reserve electrical energy to maintain the stability of the output voltage. Subsequently, the parameters of the servo drive system are optimized according to the system output and user feedback; when the system is not in use, the power is turned off according to the correct procedure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0020] Figure 1 This is a schematic diagram of the circuit structure of a servo drive system with a wide range of input voltage according to the present invention;

[0021] Figure 2 This is a first embodiment of a DC-DC buck-boost voltage regulating circuit;

[0022] Figure 3 This is a second embodiment of a DC-DC buck-boost voltage regulating circuit;

[0023] Figure 4 This is a third embodiment of a DC-DC buck-boost voltage regulation circuit. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] [Circuit structure of a servo drive system with a wide input voltage range according to the utility model]

[0026] Figure 1 The utility model is a circuit structure diagram of a servo drive system with a wide range of input voltage.

[0027] like Figure 1 As shown, the utility model provides a technical solution for a servo drive system with a wide range of input voltage, characterized in that it includes:

[0028] an AC-DC conversion circuit connected to a three-phase power input terminal, wherein the three-phase power input terminal is used to receive a three-phase AC power supply with a fixed voltage level and frequency;

[0029] A DC-DC buck-boost voltage regulating circuit, wherein the input end of the DC-DC buck-boost voltage regulating circuit is connected to the output end of the AC-DC conversion circuit;

[0030] An energy-consuming braking circuit, wherein the input end of the energy-consuming braking circuit is connected to the output end of the DC-DC buck-boost voltage regulating circuit;

[0031] a direct-to-alternating conversion circuit, wherein an input end of the direct-to-alternating conversion circuit is connected to an output end of the energy-consuming braking circuit;

[0032] A servo driver is connected to the output end of the direct-to-alternating conversion circuit.

[0033] In order to simplify the design of the system, the DC-DC buck-boost voltage regulation circuit includes at least two switching elements and three energy storage elements.

[0034] In order to improve the overall efficiency of the system, the switching element is specifically one of a MOSFET tube and an IGBT tube, and the energy storage element is an inductor or a capacitor.

[0035] [According to Example 1 of a DC-DC buck-boost voltage regulating circuit of the present invention]

[0036] Figure 2 This is a first embodiment of a DC-DC buck-boost voltage regulation circuit. Figure 2As shown, in order to meet the need for flexible voltage conversion, the present invention also provides a servo drive system with a wide range of input voltage. The DC-DC buck-boost voltage regulation circuit includes a MOSFET tube Q1, a MOSFET tube Q2, a capacitor C1, a capacitor C2 and an inductor L1. The input end of the inductor L1 is connected to the positive electrode of the capacitor C1, the output end of the inductor L1 is connected to the gate and source of the MOSFET tube Q1, the drain of the MOSFET tube Q1 is connected to the positive electrode of the capacitor C2, the drain of the MOSFET tube Q2 is connected to the output end of the inductor L1, and the source and gate of the MOSFET tube Q2 are both connected to the negative electrodes of the capacitors C1 and C2.

[0037] [According to Example 2 of a DC-DC buck-boost voltage regulating circuit of the present invention]

[0038] Figure 3 This is a DC-DC buck-boost voltage regulation circuit embodiment 2, referring to Figure 3 As shown, in order to reduce the ripple of the output voltage, the utility model also provides a servo drive system with a wide range of input voltage. The DC-DC buck-boost voltage regulation circuit includes a MOSFET tube Q3, a MOSFET tube Q4, a capacitor C3, a capacitor C4 and an inductor L2. The drain of the MOSFET tube Q3 is connected to the positive electrode of the capacitor C3, the source and gate of the MOSFET tube Q3 are connected to the drain of the MOSFET tube Q4, the source and gate of the MOSFET tube Q4 are connected to the positive electrode of the capacitor C4, the inductor L2 is connected in parallel with the capacitors C3 and C4, the input end of the inductor L2 is connected to the source and gate of the MOSFET tube Q3 and the drain of the MOSFET tube Q4, and the output end of the inductor L2 is connected to the negative electrodes of the capacitors C3 and C4.

[0039] [According to Example 3 of a DC-DC buck-boost voltage regulating circuit of the present invention]

[0040] Figure 4 This is a DC-DC buck-boost voltage regulating circuit embodiment 3, referring to Figure 4As shown, in order to provide a wider input and output range, the utility model also provides a servo drive system with a wide range of input voltage, wherein the DC-DC buck-boost voltage regulation circuit includes a MOSFET tube Q5, a MOSFET tube Q6, a capacitor C5, a capacitor C6, a capacitor C7 and an inductor L3, wherein the input end of the inductor L3 is connected to the positive electrode of the capacitor C5, the negative electrode of the inductor L3 is connected to the input end of the capacitor C7, the output end of the capacitor C7 is connected to the positive electrode of the capacitor C6, the MOSFET tube Q5, the MOSFET tube Q6 are connected in parallel with the capacitor C5 and the capacitor C6, the drain of the MOSFET tube Q5 is connected to the output end of the inductor L3 and the input end of the capacitor C7, the source and gate of the MOSFET tube Q6 are connected to the output end of the capacitor C7 and the positive electrode of the capacitor C6, and the source and gate of the MOSFET tube Q5 and the drain of Q6 are connected to the negative electrodes of the capacitors C5 and C6.

[0041] In order to expand the scope of use, the DC-DC buck-boost voltage regulation circuit can process an input voltage range of 36V to 480V.

[0042] In order to achieve accurate voltage output, the gate voltage of the MOSFET tube is adjusted by a drive circuit. The drive circuit receives a control signal from an error feedback circuit. The error feedback circuit samples from the output end of the MOSFET tube and compares the sampled value with a reference value through an operational amplifier inside the MOSFET tube. The comparison result is used to adjust the drive circuit, thereby changing the gate voltage of the MOSFET tube. If the output voltage is high, the gate voltage is reduced, the conduction degree of the MOSFET tube is reduced, and thus the output voltage is reduced, forming a negative feedback closed loop.

[0043] [Instructions for use of a servo drive system with a wide input voltage range according to the utility model]

[0044] When using a servo drive system with a wide range of input voltage, the user must ensure that the input AC power voltage is within the acceptable range of the system before starting the system, and then turn on the power so that the AC input is converted into DC power by the AC-DC conversion circuit, and a stable voltage level is maintained through the DC-DC buck-boost circuit; when the servo motor decelerates or stops, the energy-consuming braking circuit intervenes to consume regenerative energy to ensure system safety. The user needs to ensure that the control parameters of the drive are configured according to the application requirements, and pay attention to the performance of the DC-DC buck-boost voltage regulation circuit under different input voltages. Through the error feedback circuit, the system adjusts the gate voltage of the MOSFET tube to form a negative feedback closed loop, and combines the energy storage elements on the DC-DC buck-boost voltage regulation circuit to store electrical energy to maintain the stability of the output voltage. Subsequently, the parameters of the servo drive system are optimized based on the system output and user feedback; when the system is not in use, the power is turned off according to the correct procedure.

[0045] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0046] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A servo drive system with a wide range of input voltage, characterized in that: It includes: an AC-DC conversion circuit connected to a three-phase power input terminal, wherein the three-phase power input terminal is used to receive a three-phase AC power supply with a fixed voltage level and frequency; A DC-DC buck-boost voltage regulating circuit, wherein the input end of the DC-DC buck-boost voltage regulating circuit is connected to the output end of the AC-DC conversion circuit; An energy-consuming braking circuit, wherein the input end of the energy-consuming braking circuit is connected to the output end of the DC-DC buck-boost voltage regulating circuit; a direct-to-alternating conversion circuit, wherein an input end of the direct-to-alternating conversion circuit is connected to an output end of the energy-consuming braking circuit; A servo driver is connected to the output end of the direct-to-alternating conversion circuit.

2. The servo drive system with a wide input voltage range according to claim 1, characterized in that: The DC-DC buck-boost voltage regulation circuit includes at least two switching elements and three energy storage elements.

3. The servo drive system with a wide input voltage range according to claim 2, wherein: The switching element is specifically one of a MOSFET tube and an IGBT tube, and the energy storage element is an inductor or a capacitor.

4. The servo drive system with a wide input voltage range according to claim 3, wherein: The DC-DC buck-boost voltage regulation circuit includes a MOSFET tube Q1, a MOSFET tube Q2, a capacitor C1, a capacitor C2 and an inductor L1. The input end of the inductor L1 is connected to the positive electrode of the capacitor C1, the output end of the inductor L1 is connected to the gate and source of the MOSFET tube Q1, the drain of the MOSFET tube Q1 is connected to the positive electrode of the capacitor C2, the drain of the MOSFET tube Q2 is connected to the output end of the inductor L1, and the source and gate of the MOSFET tube Q2 are both connected to the negative electrodes of the capacitors C1 and C2.

5. The servo drive system with a wide input voltage range according to claim 3, characterized in that: The DC-DC buck-boost voltage regulation circuit includes a MOSFET tube Q3, a MOSFET tube Q4, a capacitor C3, a capacitor C4 and an inductor L2. The drain of the MOSFET tube Q3 is connected to the positive electrode of the capacitor C3, the source and gate of the MOSFET tube Q3 are connected to the drain of the MOSFET tube Q4, the source and gate of the MOSFET tube Q4 are connected to the positive electrode of the capacitor C4, the inductor L2 is connected in parallel with the capacitors C3 and C4, the input end of the inductor L2 is connected to the source and gate of the MOSFET tube Q3 and the drain of the MOSFET tube Q4, and the output end of the inductor L2 is connected to the negative electrodes of the capacitors C3 and C4.

6. The servo drive system with a wide input voltage range according to claim 3, characterized in that: The DC-DC buck-boost voltage regulation circuit includes a MOSFET tube Q5, a MOSFET tube Q6, a capacitor C5, a capacitor C6, a capacitor C7 and an inductor L3. The input end of the inductor L3 is connected to the positive electrode of the capacitor C5, the negative electrode of the inductor L3 is connected to the input end of the capacitor C7, and the output end of the capacitor C7 is connected to the positive electrode of the capacitor C6. The MOSFET tube Q5, the MOSFET tube Q6 are connected in parallel with the capacitor C5 and the capacitor C6. The drain of the MOSFET tube Q5 is connected to the output end of the inductor L3 and the input end of the capacitor C7. The source and gate of the MOSFET tube Q6 are connected to the output end of the capacitor C7 and the positive electrode of the capacitor C6. The source and gate of the MOSFET tube Q5 and the drain of Q6 are connected to the negative electrodes of the capacitors C5 and C6.

7. The servo drive system with a wide input voltage range according to claim 1, characterized in that: The DC-DC buck-boost voltage regulation circuit can process an input voltage range of 36V to 480V.

8. The servo drive system with a wide input voltage range according to claim 3, characterized in that: The gate voltage of the MOSFET tube is adjusted by a drive circuit, which receives a control signal from an error feedback circuit. The error feedback circuit samples from the output end of the MOSFET tube and compares the sampled value with a reference value through an operational amplifier inside the MOSFET tube. The comparison result is used to adjust the drive circuit, thereby changing the gate voltage of the MOSFET tube. If the output voltage is high, the gate voltage is reduced, reducing the conduction degree of the MOSFET tube, thereby reducing the output voltage, forming a negative feedback closed loop.

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