Servo driver protection circuit

Abstract

The utility model discloses a servo driver protection circuit, which comprises a control module, a driving module and a discharging module which are connected in sequence, and the servo driver protection circuit can prevent a bus capacitor from being overlarge in superposed energy, so that the capacitor voltage is overlarge, and a servo driver electrically connected with the bus capacitor is influenced and damaged. And when the CPU detects that the voltage generated by excessive energy caused by braking of the motor is too high, the brake tube is opened through the optical coupler, and corresponding discharge treatment is carried out, so that the voltage of the bus capacitor is reduced, and the servo driver or electronic elements in the circuit are protected. Compared with the prior art, the technical scheme of the utility model has the advantages of simple structure, reliable work and the like, and can effectively improve the work reliability and the use durability of electronic components in the servo driver.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor drive control technical field, especially in kind of servo driver protection circuit. BACKGROUND

[0002] In actual production, various types of motors are applied to different occasions, and different actuation actions can be realized, in order to ensure the intermittence and reliability of the actuation actions, distinguish according to different working time sequences, and optimize according to processing steps, the corresponding motor can carry out motor brake action between different process steps.

[0003] And in the motor brake process, the process with reverse working tendency will produce additional electricity or energy, if this part of energy is not properly released, it will be superimposed on the bus capacitor electrically connected with the motor, and when the voltage value of the bus capacitor is too high, the internal electronic components of the servo driver electrically connected with the bus capacitor will be damaged. Therefore, the protection circuit for releasing energy for the bus capacitor is very necessary for improving the working life of the servo driver. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the utility model is to provide a kind of servo driver protection circuit with simple structure and reliable work, to improve the working reliability and use durability of internal electronic components of servo driver.

[0005] To achieve the above purpose, the utility model provides a kind of servo driver protection circuit, including control module, drive module, discharge module connected in turn.

[0006] Preferably, the control module includes drive optocoupler, second resistance and fourth resistance;Second resistance one end is connected with first power supply, second resistance is connected with drive optocoupler in parallel, second resistance other end is electrically connected with fourth resistance one end, and fourth resistance other end is brake control signal receiving end.

[0007] Preferably, the drive module includes third resistance, fifth resistance and brake pipe;Third resistance one end is electrically connected with the drive optocoupler, and third resistance other end is simultaneously electrically connected with fifth resistance one end and brake pipe, fifth resistance and brake pipe are in parallel relationship, and fifth resistance other end is grounded.

[0008] Preferably, the discharge module includes first bus capacitor, second bus capacitor, first diode and first brake resistance;The brake pipe is connected with the first diode in series, and the series circuit composed of the first diode and brake pipe is connected with the first bus capacitor and the second bus capacitor in parallel, and the first brake resistance is electrically connected with the first diode at both ends.

[0009] Preferably, the drive optocoupler is also electrically connected with one end of first capacitor, and the other end of first capacitor is grounded.

[0010] The technical scheme of the utility model has the following advantages relative to the prior art:

[0011] The servo driver protection circuit has the advantages that the servo driver protection circuit can prevent the bus capacitor from being damaged due to excessive energy superimposed on the bus capacitor, and can prevent the voltage of the bus capacitor from being too high, thereby preventing the servo driver electrically connected to the bus capacitor from being damaged. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative labor.

[0013] Figure 1 The utility model discloses a specific structure diagram of the servo driver protection circuit.

[0014] The implementation, functional features and advantages of the utility model will be further described with reference to the drawings in combination with the embodiments. DETAILED DESCRIPTION

[0015] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only some embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0016] The utility model provides a kind of servo driver protection circuit.

[0017] Please refer to Figure 1 The servo driver protection circuit includes control module, drive module and discharge module connected in sequence.

[0018] Specifically, the control module of the embodiment of the utility model includes drive photoelectric coupler PC1, second resistance R2 and fourth resistance R4, wherein one end of second resistance R2 is electrically connected with first power supply +5V, second resistance R2 is electrically connected in parallel with drive photoelectric coupler PC1, and the two ends of second resistance R2 are connected with connection terminal 1 and connection terminal 3 of drive photoelectric coupler PC1 respectively, the other end of second resistance R2 is electrically connected with one end of fourth resistance R4, and the other end of fourth resistance R4 is brake control signal receiving terminal, that is, fourth resistance R4 is electrically connected with CPU.

[0019] Specifically, the drive module of the embodiment of the utility model includes third resistance R3, fifth resistance R5 and brake tube Q1, wherein one end of third resistance R3 is electrically connected with connection terminal 5 of drive photoelectric coupler PC1, the other end of third resistance R3 is electrically connected with one end of fifth resistance R5 and brake tube Q1 simultaneously, fifth resistance R5 and brake tube Q1 are in parallel relationship, and fifth resistance R5 is electrically connected with input connection terminal 1 of brake tube Q1, and the other end of fifth resistance R5 is grounded.

[0020] Specifically, the discharge module of the embodiment of the utility model includes first bus capacitor EC1, second bus capacitor EC2, first diode D1 and first brake resistance R1, wherein connection terminal 2 of brake tube Q1 is electrically connected in series with first diode D1, the series circuit composed of first diode D1 and brake tube Q1 is electrically connected in parallel with first bus capacitor EC1 and second bus capacitor EC2, the two ends of first brake resistance R1 are electrically connected with the two ends of first diode D1 respectively, one end of first brake resistance R1 is electrically connected with connection terminal 2 of brake tube Q1, connection terminal 3 of brake tube Q1 is electrically connected with first bus capacitor EC1 and second bus capacitor EC2 simultaneously, and connection terminal 2 of first diode D1 is electrically connected with the other end of first bus capacitor EC1 and second bus capacitor EC2 simultaneously.

[0021] Preferably, the utility model discloses the connection terminal 6 of drive photoelectric coupler PC1 is also electrically connected with one end of first capacitor C1, and the other end of first capacitor C1 is grounded.

[0022] Please refer to the attached Figure 1 The working principle of the servo driver protection circuit of the utility model is:

[0023] The control module of the utility model technical scheme adopts drive photoelectric coupler PC1 to carry out isolation control, after CPU detects brake control signal, the CPU connected with fourth resistance R4 will send brake control signal into drive photoelectric coupler PC1 through fourth resistance R4, and when brake control signal is effective signal, drive photoelectric coupler PC1 is in the effective state of conduction at this time.

[0024] When the brake control signal is an invalid signal or there is no brake control signal, then the voltage is pulled up through the second resistor R2, so as to ensure that the driving optocoupler PC1 is in the off state when there is no input signal.

[0025] When the driving optocoupler PC1 is turned on, the base of the brake tube Q1 is driven, and at this time, the brake tube Q1 is in the on state.

[0026] When the brake tube Q1 is turned on, the first bus capacitor EC1 and the second bus capacitor are discharged through the first resistor R1 for discharging, so as to avoid that the first bus capacitor EC1 and the second bus capacitor EC2 are stacked with too much energy.

[0027] In addition, the first capacitor C1 is used as a decoupling capacitor for filtering possible high-frequency interference.

[0028] Therefore, the servo driver protection circuit can prevent the bus capacitor from being stacked with too much energy, so that the capacitor voltage is too large, and the servo driver electrically connected thereto is damaged.

[0029] The above only describes the preferred embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields within the scope of the present application is included in the patent protection range of the present application.

Claims

1. A servo driver protection circuit, characterized by, The control module, the driving module and the discharging module are connected in sequence.

2. The servo driver protection circuit of claim 1, wherein, The control module comprises a driving optocoupler, a second resistor and a fourth resistor; one end of the second resistor is connected with a first power supply, the second resistor is connected in parallel with the driving optocoupler, the other end of the second resistor is connected with one end of the fourth resistor, and the other end of the fourth resistor is a brake control signal receiving end.

3. The servo driver protection circuit of claim 2, wherein, The driving module comprises a third resistor, a fifth resistor and a brake pipe; one end of the third resistor is connected with the driving optocoupler, the other end of the third resistor is connected with one end of the fifth resistor and the brake pipe at the same time, the fifth resistor is in parallel connection with the brake pipe, and the other end of the fifth resistor is connected with the ground.

4. The servo driver protection circuit of claim 3, wherein, The discharging module comprises a first bus capacitor, a second bus capacitor, a first diode and a first brake resistor; the brake pipe is connected in series with the first diode, the series circuit composed of the first diode and the brake pipe is connected in parallel with the first bus capacitor and the second bus capacitor, and the first brake resistor is connected with the first diode at two ends respectively.

5. The servo driver protection circuit of claim 4, wherein, The driving optocoupler is also connected with one end of a first capacitor, and the other end of the first capacitor is connected with the ground.

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