CN217508582U

CN217508582U - Servo control's PWM buffer circuit

Info

Publication number: CN217508582U
Application number: CN202122865641.1U
Authority: CN
Inventors: 王刚志; 陈凯强
Original assignee: Hangzhou Zhishan Intelligent Control Technology Co ltd
Current assignee: Hangzhou Zhishan Intelligent Control Technology Co ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-09-27
Anticipated expiration: 2031-11-22

Abstract

The utility model provides a servo control's PWM buffer circuit, including the high-speed magnetism of six-channel that is connected with servo motor circuit and keeping apart the chip, the high-speed magnetism of six-channel keeps apart the chip and includes input and output, input connecting circuit power VCC and six way PWM signals, the output is connected with the 5V power and exports six way PWM output signal to servo motor; the 5V power supply is connected with two capacitors which are connected in parallel. The utility model realizes the output and isolation of six paths of PWM by the six-channel high-speed magnetic isolation chip, thus reducing the wiring area of PCB and lowering the cost; and the circuit structure is simple and easy to realize, circuit faults can be reduced, and the overhaul is easier.

Description

Servo control's PWM buffer circuit

Technical Field

The utility model belongs to the technical field of the PWM keeps apart, concretely relates to servo control's PWM buffer circuit.

Background

With the rapid development of power electronic technology and computer control technology, the technology of a servo motor is remarkably improved, the drive of the servo motor is controlled by a servo controller, so that a servo controller matched with the servo motor is required to accurately operate the servo motor, and the conventional servo is usually controlled by PWM pulses.

Pulse width modulation PWM is a very efficient technique for controlling analog circuits using the digital output of a microprocessor, and is widely used in many fields involving measurement, communication, power control and conversion.

At present, six paths of PWM output are needed for servo control and optical coupler isolation is needed for all the paths of PWM, six optical couplers are needed for isolation in a photoelectric isolation circuit, as shown in figure 1, a motor control circuit is formed by connecting six power switch tubes in a pairwise mode, each serial connection point is a phase output end and is connected with a controlled motor, an asynchronous communication circuit is connected with an optical coupler in series, and six output ends of a DSP are directly connected with six control ends of a PWM motor controller. The designed circuit structure is relatively complex, the PCB wiring area is large, and the cost is high.

Disclosure of Invention

The utility model aims at the above-mentioned problem, a servo control's PWM buffer circuit is provided, PCB wiring area can be reduced, reduce cost.

In order to achieve the above purpose, the utility model adopts the following technical proposal:

a servo-controlled PWM (pulse-width modulation) isolation circuit comprises a six-channel high-speed magnetic isolation chip connected with a servo motor circuit, wherein the six-channel high-speed magnetic isolation chip comprises an input end and an output end, the input end is connected with a circuit power supply VCC (voltage current transformer) and six PWM (pulse-width modulation) signals, and the output end is connected with a 5V power supply and outputs six PWM output signals to the servo motor; the 5V power supply is connected with two capacitors which are connected in parallel. The utility model discloses a six-channel high-speed magnetism keeps apart chip integral type and realizes six way PWM outputs and keep apart, and the integrated level is high, circuit structure is simple.

Further, the input terminals include a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, a seventh input terminal, and an eighth input terminal; the output end comprises a first output end, a second output end, a third output end, a fourth output end, a fifth output end, a sixth output end, a seventh output end and an eighth output end.

Further, the pin of the first input terminal is VCC1, and is connected to the power supply VCC, and is grounded through the connection capacitor.

Furthermore, the six paths of PWM signals comprise PWM-W-signals, PWM-W + signals, PWM-V-signals, PWM-V + signals, PWM-U-signals and PWM-U + signals which are respectively connected to the input end through resistors.

Furthermore, the second input end to the seventh input end are respectively connected with a PWM-W-signal, a PWM-W + signal, a PWM-V-signal, a PWM-V + signal, a PWM-U-signal and a PWM-U + signal through resistors.

Further, the pin of the first output terminal is VCC2 and is connected to +5V _ IMP, and the eighth output terminal is connected to GND _ IPM.

Furthermore, the first output end is connected with +5V _ IMP and is connected with GND _ IPM of the eighth output end through two capacitors, and the two capacitors are connected in parallel.

Further, the six-way PWM output signal includes a WNA signal, a WPA signal, a VNA signal, a VPA signal, a UNA signal, and a UPA signal input to the servo.

Further, the second output terminal to the seventh output terminal respectively output a WNA signal, a WPA signal, a VNA signal, a VPA signal, a UNA signal, and a UPA signal.

Further, the first input end to the eighth input end correspond to the first output end to the eighth output end one to one respectively.

Compared with the prior art, the utility model has the advantages of:

1. the utility model relates to a servo control PWM isolating circuit realizes six-channel PWM output and isolation through a six-channel high-speed magnetic isolation chip, can reduce the PCB wiring area and reduce the cost;

2. the utility model discloses circuit structure is simple easily realizes, can reduce circuit fault and change the maintenance.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a circuit schematic of the prior art;

fig. 2 is a schematic circuit diagram of a servo-controlled PWM isolation circuit according to the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution in the embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 2, the servo-controlled PWM isolation circuit of this embodiment includes a six-channel high-speed magnetic isolation chip connected to a servo motor circuit, where the six-channel high-speed magnetic isolation chip includes an input end and an output end, the input end is connected to a circuit power VCC and six PWM signals, and the output end is connected to a 5V power supply and outputs six PWM output signals to the servo motor; the 5V power supply is connected with two capacitors which are connected in parallel. The utility model discloses a six-channel high-speed magnetism keeps apart chip integral type and realizes six way PWM outputs and keep apart, and the integrated level is high, circuit structure is simple.

The input terminals of this embodiment include a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, a seventh input terminal, and an eighth input terminal. The pin of the first input end is VCC1, is connected with a power supply VCC, and is grounded through a connecting capacitor; the eighth input terminal is connected to ground and to DGND.

In the embodiment, six paths of PWM signals are respectively connected to the input end through resistors and comprise PWM-W-signals, PWM-W + signals, PWM-V-signals, PWM-V + signals, PWM-U-signals and PWM-U + signals. The PWM-W-signal is connected with the second input end through a resistor, the PWM-W + signal is connected with the third input end through a resistor, the PWM-V-signal is connected with the fourth input end through a resistor, the PWM-V + signal is connected with the fifth input end through a resistor, the PWM-U-signal is connected with the sixth input end through a resistor, and the PWM-U + signal is connected with the seventh input end through a resistor.

The output end of the present embodiment includes a first output end, a second output end, a third output end, a fourth output end, a fifth output end, a sixth output end, a seventh output end, and an eighth output end.

In this embodiment, the pin of the first output terminal is VCC2 connected to +5V _ IMP, and the eighth output terminal is connected to GND _ IPM. The first output end is connected with the eighth output end through two capacitors, and the two capacitors are connected in parallel.

The six PWM output signals of the present embodiment include the WNA signal, WPA signal, VNA signal, VPA signal, UNA signal, and UPA signal input to the servo. The second output end outputs a WNA signal, the third output end outputs a WPA signal, the fourth output end outputs a VNA signal, the fifth output end outputs a VPA signal, the sixth output end outputs a UNA signal, and the seventh output end outputs a UPA signal.

In this embodiment, the first input terminal to the eighth input terminal correspond to the first output terminal to the eighth output terminal one by one. The PWM-W-signal is connected with a second input end through a resistor, and a WNA signal is output by a second output end after being isolated by a six-channel high-speed magnetic isolation chip; the PWM-W + signal is connected with a third input end through a resistor, and a WPA signal is output by a third output end after being isolated by a six-channel high-speed magnetic isolation chip; the PWM-V-signal is connected with a fourth input end through a resistor, and is isolated by a six-channel high-speed magnetic isolation chip, and then a VNA signal is output from a fourth output end; the PWM-V + signal is connected with a fifth input end through a resistor, and is isolated by a six-channel high-speed magnetic isolation chip and then a VPA signal is output from a fifth output end; the PWM-U-signal is connected with a sixth input end through a resistor, and is isolated by a six-channel high-speed magnetic isolation chip and then outputs a UNA signal through a sixth output end; the PWM-U + signal is connected with the seventh input end through a resistor and is isolated by the six-channel high-speed magnetic isolation chip, and then a UPA signal is output by the seventh output end.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A servo-controlled PWM (pulse-width modulation) isolation circuit is characterized by comprising a six-channel high-speed magnetic isolation chip connected with a servo motor circuit, wherein the six-channel high-speed magnetic isolation chip comprises an input end and an output end, the input end is connected with a circuit power supply VCC (voltage current transformer) and six PWM (pulse-width modulation) signals, and the output end is connected with a 5V power supply and outputs six PWM output signals to the servo motor; the 5V power supply is connected with two capacitors which are connected in parallel.

2. The servo-controlled PWM isolation circuit of claim 1 wherein the inputs include a first input, a second input, a third input, a fourth input, a fifth input, a sixth input, a seventh input, and an eighth input; the output end comprises a first output end, a second output end, a third output end, a fourth output end, a fifth output end, a sixth output end, a seventh output end and an eighth output end.

3. The servo-controlled PWM isolation circuit of claim 2, wherein the pin of the first input terminal is VCC1 connected to a power supply VCC and connected to ground through a connecting capacitor.

4. The servo-controlled PWM isolation circuit of claim 2, wherein the six PWM signals comprise a PWM-W-signal, a PWM-W + signal, a PWM-V-signal, a PWM-V + signal, a PWM-U-signal, and a PWM-U + signal respectively connected to the input terminal through a resistor.

5. The servo-controlled PWM isolation circuit according to claim 4, wherein the second to seventh input terminals are respectively connected to the PWM-W-, PWM-W +, PWM-V-, PWM-U-, and PWM-U + signals through resistors.

6. The servo-controlled PWM isolation circuit according to claim 2, wherein the pin of the first output terminal is VCC2 connected to +5V _ IMP, and the eighth output terminal is connected to GND _ IPM.

7. The servo-controlled PWM isolation circuit according to claim 6, wherein the first output terminal is connected to +5V _ IMP and connected to GND _ IPM of the eighth output terminal through two capacitors, and the two capacitors are connected in parallel.

8. The servo-controlled PWM isolation circuit of claim 2, wherein the six PWM output signals comprise WNA, WPA, VNA, VPA, UNA, and UPA signals input to the servo.

9. The servo-controlled PWM isolation circuit of claim 8, wherein the second to seventh output terminals output WNA, WPA, VNA, VPA, UNA, and UPA signals, respectively.

10. The servo-controlled PWM isolation circuit according to any one of claims 2-9, wherein the first to eighth input terminals are in one-to-one correspondence with the first to eighth output terminals, respectively.