CN220711322U - Negative pressure circuit applied to servo driver - Google Patents
Negative pressure circuit applied to servo driver Download PDFInfo
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- CN220711322U CN220711322U CN202322372593.1U CN202322372593U CN220711322U CN 220711322 U CN220711322 U CN 220711322U CN 202322372593 U CN202322372593 U CN 202322372593U CN 220711322 U CN220711322 U CN 220711322U
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Abstract
The utility model provides a negative-pressure circuit applied to a servo driver, which solves the problems of inconvenient supply of negative voltage of an operational amplifier and the like. The utility model has the advantages of simple structure, stable pressure supply and the like.
Description
Technical Field
The utility model belongs to the technical field of servo drive circuits, and particularly relates to a negative pressure circuit applied to a servo driver.
Background
Currently, servo drives on the market generally have an analog input interface for controlling the speed and torque of the servo. The analog quantity is input to the driver through an external terminal, but when 0 voltage input is caused in the terminal plugging process, the voltage signal received by the servo driver is not 0. At this time, an operational amplifier can be used for voltage following, and the analog input has positive and negative voltages and represents different directions. The operational amplifier also needs to be powered by a double power supply to meet the following requirements of positive and negative voltages, and negative voltages are needed to be provided for the operational amplifier. It is common practice to output a negative voltage using a separate winding of a switching power supply transformer. This increases the volume of the transformer, the area of the wiring PCB, and the cost. Particularly in case of insufficient transformer pins.
In order to solve the defects existing in the prior art, long-term exploration is performed, and various solutions are proposed. For example, chinese patent literature discloses a servo drive circuit [202010123076.9] that includes a control circuit, a charging circuit, a bus capacitor, a discharging circuit, a capacitance detection circuit, and a power drive circuit, wherein the control circuit is connected with the charging circuit, the discharging circuit, the capacitance detection circuit, and the power drive circuit, respectively, the charging circuit is connected with the bus capacitor, and the bus capacitor is connected with the discharging circuit, the capacitance detection circuit, and the power drive circuit, respectively.
The above scheme solves the problem of servo drive detection to a certain extent, but the scheme still has a plurality of defects, such as incapability of providing negative voltage for an operational amplifier and the like.
Disclosure of Invention
The utility model aims to solve the problems and provide a negative-pressure circuit which is reasonable in design and is applied to a servo driver and provides negative voltage for an operational amplifier.
In order to achieve the above purpose, the present utility model adopts the following technical scheme: the negative pressure circuit comprises a power supply module and a power supply conversion module connected with the power supply module, wherein the power supply module is provided with a voltage lifting module, a low-dropout voltage stabilizing module is connected between the power supply module and the power supply conversion module, and the power supply conversion module is connected with a linear voltage stabilizing module.
In the negative-pressure circuit applied to the servo driver, the power supply module comprises a negative power supply chip U3, and the model SGM3207 is selected as the negative power supply chip U3.
In the negative pressure circuit applied to the servo driver, the pin 2 of the negative power supply chip U3 is grounded through the capacitor C1, the pin 1 of the negative power supply chip U3 is grounded through the capacitor C2, the capacitor C3 is connected between the pin 3 and the pin 5 of the negative power supply chip U3, and the pin 4 of the negative power supply chip U3 is grounded.
In the above-mentioned negative pressure circuit applied to a servo driver, the power conversion module includes a first power conversion chip U1 and a second power conversion chip U2, where the first power conversion chip U1 and the second power conversion chip U2 are of LCL7660 type.
In the above-mentioned negative pressure circuit applied to the servo driver, the pin 2 of the first power conversion chip U1 is connected with the capacitor C4, and the pin 2 of the second power conversion chip U2 is connected with the capacitor C5; the pin 8 of the first power conversion chip U1 and the pin 8 of the second power conversion chip U2 are connected with the power supply module, and capacitors C6 and C7 which are connected in parallel are connected between the pins.
In the above-mentioned negative pressure circuit applied to a servo driver, the low dropout voltage regulator module includes a first voltage regulator chip U4 and a second voltage regulator chip U5, where the first voltage regulator chip U4 and the second voltage regulator chip U5 are ASM 1117.
In the negative pressure circuit applied to the servo driver, the pin 2 of the first voltage stabilizing chip U4 is connected with the capacitors C8 and C9 connected in parallel, the pin 2 of the second voltage stabilizing tube chip U5 is connected with the capacitors C10 and C11 connected in parallel, and the pin 3 of the first voltage stabilizing chip U4 and the second voltage stabilizing tube chip U5 are connected with the power supply module and connected with the capacitors C12 and C13 connected in parallel.
In the negative pressure circuit applied to the servo driver, the linear voltage stabilizing module comprises a linear voltage stabilizing chip U6, and the linear voltage stabilizing chip U6 is of MC79L05 type.
In the negative pressure circuit applied to the servo driver, the pin 1 of the linear voltage stabilizing chip U6 is connected with the capacitors C14 and C15 connected in parallel, the pin 2 of the linear voltage stabilizing chip U6 is connected with the power conversion module through the inductor L1, the capacitors C16 and C17 connected in parallel are connected between the inductor L1 and the linear voltage stabilizing chip U6, and the capacitor C18 is connected between the inductor L1 and the power conversion module.
In the above-mentioned negative pressure circuit applied to a servo driver, the voltage lifting module includes an operational amplifier U7, the operational amplifier U7 is of model ADA4528, a resistor R1 is connected between a pin 2 and a pin 6 of the operational amplifier U7, the pin 2 of the operational amplifier U7 is grounded through the resistor R2, and a pin 3 of the operational amplifier U7 is connected with resistors R3 and R4.
Compared with the prior art, the utility model has the advantages that: the bootstrap capacitor and the filter capacitor packaged in the power supply module are utilized to provide negative voltage, so that the positive and negative voltage input requirements of the operational amplifier analog quantity are met; the voltage lifting module lifts the signal after conditioning, so that the single power supply requirement of the circuit can be met; the low dropout voltage regulator module is matched with the linear voltage regulator module, and voltage accuracy is ensured while high current is generated.
Drawings
Fig. 1 is a schematic diagram of a power supply module of the present utility model;
FIG. 2 is a schematic diagram of a voltage regulator module according to the present utility model;
fig. 3 is a schematic diagram of a voltage boosting module according to the present utility model.
Detailed Description
The utility model will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1-3, a negative pressure circuit applied to a servo driver comprises a power supply module and a power supply conversion module connected with the power supply module, wherein the power supply module is provided with a voltage lifting module, a low-dropout voltage stabilizing module is connected between the power supply module and the power supply conversion module, and the power supply conversion module is connected with a linear voltage stabilizing module. The negative voltage circuit can provide 60mA current, and the ripple wave of the power supply is less than 50mV, and the circuit structure is simple, and the special PCB area is small.
As shown in fig. 1, the power supply module includes a negative power supply chip U3, the negative power supply chip U3 is an SGM3207 model, the power supply range is 1.4-5V, and the output is-1.4V to-5V.
In depth, the pin 2 of the negative power supply chip U3 is grounded through the capacitor C1, the pin 1 of the negative power supply chip U3 is grounded through the capacitor C2, the capacitor C3 is connected between the pin 3 and the pin 5 of the negative power supply chip U3, and the pin 4 of the negative power supply chip U3 is grounded.
As shown in fig. 2, the power conversion module includes a first power conversion chip U1 and a second power conversion chip U2, the first power conversion chip U1 and the second power conversion chip U2 are LCL7660, and the first power conversion chip U1 and the second power conversion chip U2 divide the input voltage into two parts except for voltage conversion.
Further, a capacitor C4 is connected to the pin 2 of the first power conversion chip U1, and a capacitor C5 is connected to the pin 2 of the second power conversion chip U2; the pin 8 of the first power conversion chip U1 and the pin 8 of the second power conversion chip U2 are connected with the power supply module, and capacitors C6 and C7 which are connected in parallel are connected between the pins.
In addition, the low dropout voltage regulator module includes a first voltage regulator chip U4 and a second voltage regulator chip U5, where the first voltage regulator chip U4 and the second voltage regulator chip U5 are ASM 1117. The first voltage stabilizing chip U4 and the second voltage stabilizing tube chip U5 adopt a parallel connection mode, and are generally in communication connection by adopting an RS232 interface. When the current is higher, the low-dropout voltage stabilizing module automatically fuses.
Meanwhile, the pin 2 of the first voltage stabilizing chip U4 is connected with parallel capacitors C8 and C9, the pin 2 of the second voltage stabilizing tube chip U5 is connected with parallel capacitors C10 and C11, and the pin 3 of the first voltage stabilizing chip U4 and the pin 3 of the second voltage stabilizing tube chip U5 are connected with a power supply module and connected with parallel capacitors C12 and C13.
The linear voltage stabilizing module comprises a linear voltage stabilizing chip U6, and the linear voltage stabilizing chip U6 is of MC79L05 type. The linear voltage stabilizing chip U6 and the circuit structure thereof can realize active filtering, can greatly improve the voltage stabilizing precision of output voltage, and can not obviously reduce the efficiency.
Obviously, the pin 1 of the linear voltage stabilizing chip U6 is connected with the capacitors C14 and C15 which are connected in parallel, the pin 2 of the linear voltage stabilizing chip U6 is connected with the power conversion module through the inductor L1, the capacitors C16 and C17 which are connected in parallel are connected between the inductor L1 and the linear voltage stabilizing chip U6, and the capacitor C18 is connected between the inductor L1 and the power conversion module.
As shown in fig. 3, the voltage lifting module includes an operational amplifier U7, where the operational amplifier U7 is an ADA4528 model, a resistor R1 is connected between a pin 2 and a pin 6 of the operational amplifier U7, the pin 2 of the operational amplifier U7 is grounded through the resistor R2, and a pin 3 of the operational amplifier U7 is connected with resistors R3 and R4.
In summary, the principle of this embodiment is as follows: the power supply module and the power supply conversion module connected with the power supply module are matched to output negative voltage, wherein the low-dropout voltage stabilizing module and the linear voltage stabilizing module ensure stability in the voltage lifting process, and the digital power supply and the analog power supply of the servo driver can be respectively and independently supplied with power.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.
Although terms such as power supply module, power conversion module, etc. are used more herein, the possibility of using other terms is not precluded. These terms are used merely for convenience in describing and explaining the nature of the utility model; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present utility model.
Claims (10)
1. The negative pressure circuit applied to the servo driver comprises a power supply module and a power supply conversion module connected with the power supply module, and is characterized in that the power supply module is provided with a voltage lifting module, a low-dropout voltage stabilizing module is connected between the power supply module and the power supply conversion module, and the power supply conversion module is connected with a linear voltage stabilizing module.
2. The negative-pressure circuit for a servo driver according to claim 1, wherein the power supply module comprises a negative power supply chip U3, and the negative power supply chip U3 is an SGM3207 type.
3. The negative voltage circuit for a servo driver according to claim 2, wherein the pin 2 of the negative power supply chip U3 is grounded through the capacitor C1, the pin 1 of the negative power supply chip U3 is grounded through the capacitor C2, the capacitor C3 is connected between the pin 3 and the pin 5 of the negative power supply chip U3, and the pin 4 of the negative power supply chip U3 is grounded.
4. The negative pressure circuit for a servo driver according to claim 1, wherein the power conversion module comprises a first power conversion chip U1 and a second power conversion chip U2, and the first power conversion chip U1 and the second power conversion chip U2 are of LCL7660 type.
5. The negative pressure circuit for servo driver according to claim 4, wherein the pin 2 of the first power conversion chip U1 is connected to the capacitor C4, and the pin 2 of the second power conversion chip U2 is connected to the capacitor C5; the pin 8 of the first power conversion chip U1 and the pin 8 of the second power conversion chip U2 are connected with the power supply module, and capacitors C6 and C7 which are connected in parallel are connected between the pins.
6. The negative pressure circuit for a servo driver according to claim 1, wherein the low dropout voltage regulator module comprises a first voltage regulator chip U4 and a second voltage regulator chip U5, and the first voltage regulator chip U4 and the second voltage regulator chip U5 are ASM 1117.
7. The negative pressure circuit for a servo driver according to claim 6, wherein the pin 2 of the first voltage stabilizing chip U4 is connected with parallel capacitors C8 and C9, the pin 2 of the second voltage stabilizing chip U5 is connected with parallel capacitors C10 and C11, and the pin 3 of the first voltage stabilizing chip U4 and the second voltage stabilizing chip U5 are connected with the power supply module and parallel capacitors C12 and C13 are connected therebetween.
8. The negative pressure circuit for the servo driver according to claim 1, wherein the linear voltage stabilizing module comprises a linear voltage stabilizing chip U6, and the linear voltage stabilizing chip U6 is of the MC79L05 type.
9. The negative-pressure circuit for the servo driver according to claim 8, wherein the pin 1 of the linear voltage stabilizing chip U6 is connected with capacitors C14 and C15 in parallel, the pin 2 of the linear voltage stabilizing chip U6 is connected with the power conversion module through an inductor L1, the capacitors C16 and C17 in parallel are connected between the inductor L1 and the linear voltage stabilizing chip U6, and the capacitor C18 is connected between the inductor L1 and the power conversion module.
10. The negative pressure circuit for the servo driver according to claim 1, wherein the voltage lifting module comprises an operational amplifier U7, the operational amplifier U7 is of an ADA4528 type, a resistor R1 is connected between a pin 2 and a pin 6 of the operational amplifier U7, the pin 2 of the operational amplifier U7 is grounded through the resistor R2, and a pin 3 of the operational amplifier U7 is connected with resistors R3 and R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322372593.1U CN220711322U (en) | 2023-08-31 | 2023-08-31 | Negative pressure circuit applied to servo driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322372593.1U CN220711322U (en) | 2023-08-31 | 2023-08-31 | Negative pressure circuit applied to servo driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220711322U true CN220711322U (en) | 2024-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322372593.1U Active CN220711322U (en) | 2023-08-31 | 2023-08-31 | Negative pressure circuit applied to servo driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220711322U (en) |
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2023
- 2023-08-31 CN CN202322372593.1U patent/CN220711322U/en active Active
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