CN210167795U - PWM signal locking circuit of servo driver - Google Patents
PWM signal locking circuit of servo driver Download PDFInfo
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- CN210167795U CN210167795U CN201920394594.7U CN201920394594U CN210167795U CN 210167795 U CN210167795 U CN 210167795U CN 201920394594 U CN201920394594 U CN 201920394594U CN 210167795 U CN210167795 U CN 210167795U
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Abstract
The utility model provides a PWM signal locking circuit of servo driver, including signal output circuit and locking circuit, signal output circuit includes signal input port and signal output port, and signal input port is connected with host system, and signal output port is connected with the IGBT module, is provided with control chip between signal input port and the signal output port with the output of control signal; the locking circuit is internally provided with a trigger and a reset circuit, the trigger is connected with the IGBT module, and the trigger is used for receiving a trigger signal sent by the IGBT module, transmitting the trigger signal to the main control module and the control chip and locking the trigger signal. The utility model discloses a set up PWM signal locking circuit, under the unusual condition of servo driver, can turn off the IGBT module to lock it at the turn-off state, just carry out the unblock recovery until assigning reset signal, prevent that the IGBT module from opening the IGBT module again by mistake under the condition of having turned off, lead to it to take place the excessive pressure and damage.
Description
Technical Field
The utility model relates to a servo driver control field especially relates to a servo driver's PWM signal locking circuit.
Background
In industrial production, the servo driver is widely applied, wherein the IGBT module in the servo driver is prone to overvoltage damage under abnormal conditions of the servo motor, a timely protection mechanism is lacked to protect the IGBT module, and even if the IGBT module is in an off state, false opening is prone to occur under some difficult and complicated fault conditions, so that secondary damage is caused.
For example, chinese utility model patent publication No. CN103346538B discloses a short circuit protection circuit for an APF high-power IGBT, which includes a working control circuit for the IGBT for controlling whether the IGBT works or not; and the short-circuit protection circuit of the IGBT is used for monitoring the short-circuit current of the IGBT and preventing the IGBT from being damaged due to overvoltage caused by short circuit of the IGBT by utilizing the circuit for slowly reducing the grid voltage. The short-circuit protection circuit of the IGBT comprises a working control circuit of the short-circuit protection circuit, and the working control circuit is used for controlling whether the short-circuit protection circuit works or not; the detection circuit of the short-circuit protection circuit is used for detecting the voltage of the IGBT; the slow grid voltage reduction circuit is used for slowly reducing the grid voltage; and the protection latch reset circuit is used for protecting and locking the PWM and completely turning off the IGBT. According to the scheme, the advantage that the overvoltage is reduced when the IGBT module is turned off by adopting a soft turn-off mode of slowly reducing the voltage of the IGBT grid electrode when short circuit occurs is achieved, but the turn-off signal cannot be locked, and the problem that secondary damage is caused due to the fact that mistaken turn-on of a follow-up IGBT module cannot be solved.
Disclosure of Invention
The to-be-solved technical problem aim at provides a servo driver's PWM signal locking circuit for solve servo driver and appearing unusually, the IGBT module still has the problem that the mistake was opened after turning off.
In order to realize the purpose, the utility model discloses a technical scheme as follows:
a PWM signal locking circuit of a servo driver, comprising: a signal output circuit and a lock circuit;
the signal output circuit comprises a signal input port and a signal output port, the signal input port is connected with the main control module and used for receiving PWM signals, the signal output port is connected with the IGBT module and used for outputting the PWM signals to the IGBT module, a control chip is arranged between the signal input port and the signal output port and used for controlling the output of the PWM signals;
a trigger and a reset circuit connected with the trigger are arranged in the locking circuit;
the trigger is used for judging whether an alarm signal sent by the IGBT module is received or not, if so, the alarm signal is forwarded to the main control module and the control chip and enters a locking state, and the control chip receives the alarm signal and locks the PWM signal to turn off the IGBT module;
the reset circuit is used for sending a reset signal to the trigger, when the trigger receives the reset signal, the trigger releases the locking state and sends an unlocking signal to the control chip, and the control chip unlocks the PWM signal to start the IGBT module.
Preferably, one end of a twenty-fifth resistor is connected between the trigger and the IGBT module, one end of a twenty-fourth resistor is further connected between the trigger and the reset circuit, and the other end of the twenty-fourth resistor is connected with the second power supply after being connected with the other end of the twenty-fifth resistor.
Preferably, one end of a twelfth capacitor is further connected between the trigger and the IGBT module, one end of an eleventh capacitor is further connected between the trigger and the reset circuit, and the other end of the eleventh capacitor is connected with the other end of the twelfth capacitor and then grounded.
Preferably, the control chip includes a first chip and a second chip, the signal input port includes a first input port, a second input port, a third input port, a fourth input port, a fifth input port, and a sixth input port, the first input port, the second input port, and the third input port are connected to the first chip, and the fourth input port, the fifth input port, and the sixth input port are connected to the second chip.
Preferably, one end of a fifth resistor is connected between the first chip and the first input port, one end of a sixth resistor is connected between the first chip and the second input port, one end of a seventh resistor is connected between the first chip and the third input port, and the other end of the fifth resistor, the other end of the sixth resistor, and the other end of the seventh resistor are connected and then grounded.
Preferably, one end of a sixteenth resistor is connected between the second chip and the fourth input port, one end of a seventeenth resistor is connected between the second chip and the fifth input port, one end of an eighteenth resistor is connected between the second chip and the sixth input port, and the other end of the sixteenth resistor, the other end of the seventeenth resistor and the other end of the eighteenth resistor are connected and then grounded.
Preferably, the signal output ports include a first output port, a second output port, a third output port, a fourth output port, a fifth output port, and a sixth output port, the first output port, the second output port, and the third output port are connected to the first chip, and the fourth output port, the fifth output port, and the sixth output port are connected to the second chip.
Preferably, a first filter circuit is connected between the first output port and the first chip, a second filter circuit is connected between the second output port and the first chip, and a third filter circuit is connected between the third output port and the first chip.
Preferably, a fourth filter circuit is connected between the fourth output port and the second chip, a fifth filter circuit is connected between the fifth output port and the second chip, and a sixth filter circuit is connected between the sixth output port and the second chip.
Preferably, the first filter circuit, the second filter circuit, the third filter circuit, the fourth filter circuit, the fifth filter circuit and the sixth filter circuit are RC filter circuits.
Adopt the utility model discloses, through setting up signal locking circuit, when servo driver is unusual, signal locking circuit will receive the alarm signal of IGBT module, triggers turn-off signal, and control chip will directly lock PWM signal's output in order to turn off the IGBT module, just triggers unblock PWM signal's output once more when having reset signal, prevents that the IGBT module from opening the IGBT module once more after turning off because the operation such as mistake is opened, causes the secondary to damage.
Drawings
FIG. 1 is a schematic diagram of a system according to an embodiment of the present invention
Fig. 2 is a schematic circuit diagram of a signal output circuit of a servo driver according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a locking circuit of a servo driver according to an embodiment of the present invention.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
Example one
Referring to fig. 1, the present embodiment provides a PWM signal locking circuit of a servo driver, including: a signal output circuit and a lock circuit;
the signal output circuit comprises a signal input port and a signal output port, the signal input port is connected with the main control module and used for receiving the PWM signals, the signal output port is connected with the IGBT module and used for outputting the PWM signals to the IGBT module, a control chip is arranged between the signal input port and the signal output port and used for controlling the output of the PWM signals;
a trigger and a reset circuit connected with the trigger are arranged in the locking circuit;
the trigger is used for judging whether an alarm signal sent by the IGBT module is received or not, if so, the alarm signal is forwarded to the main control module and the control chip, the control chip enters a locking state, receives the alarm signal and locks the PWM signal to turn off the IGBT module;
the reset circuit is used for sending a reset signal to the trigger, when the trigger receives the reset signal, the trigger releases the locking state and sends an unlocking signal to the control chip, and the control chip unlocks the PWM signal to start the IGBT module.
In this embodiment, the main control module inputs a PWM signal from the signal input port, and the PWM signal passes through the control chip and then is output to the driving optocoupler of the IGBT module through the signal output port to control the IGBT module.
When the drive optocoupler in the IGBT module detects that an abnormal signal exists, an alarm signal is sent, the alarm signal is transmitted to a trigger in the locking circuit, the trigger forwards the alarm signal to the main control module and the control chip, on one hand, the control chip sends a turn-off signal, the output of a PWM signal is directly turned off, namely, the IGBT module is turned off, the trigger can also enter a locking state, the turn-off signal is locked, the IGBT module cannot be switched on, the locking can be eliminated until the trigger receives a reset signal, the alarm signal is eliminated at the moment, the control chip continues to control the output of the PWM signal, and the IGBT module can be switched on.
Through setting up signal output circuit and locking circuit, when servo driver abnormal conditions appeared, can be through the timely shutoff IGBT module of hardware, through can guaranteeing in addition before the unusual elimination, the turn-off state of IGBT module is locked, can not open by mistake and the like the condition and lead to the secondary damage.
In this embodiment, the PWM signal is a pulse signal and the pulse width can be modulated, wherein PWM is a method for digitally encoding the level of an analog signal, and the duty cycle of a square wave is modulated to encode the level of a specific analog signal through the use of a high resolution counter.
Compared with sinusoidal signals, PWM signals have the advantages of small harmonic waves and fast response.
In this embodiment, the IGBT module includes an IGBT, and the IGBT module is generally installed in the servo driver, where the IGBT is an insulated gate bipolar transistor, and is a composite fully-controlled voltage-driven power semiconductor device composed of a BJT (bipolar junction transistor) and an MOS (insulated gate field effect transistor), and has both advantages of high input impedance of the MOSFET and low conduction voltage drop of the GTR, and it can also be applied to the fields of a converter system with a dc voltage of 600V or more, such as an ac motor, a frequency converter, a switching power supply, a lighting circuit, and traction drive.
Referring to FIG. 2, in a preferred embodiment, the control chip includes a first chip U1 and a second chip U2, and the signal input ports include a first input port (V +), a second input port (U +), a third input port (W +), a fourth input port (V-), a fifth input port (U-), and a sixth input port (W-).
The first input port (V +), the second input port (U +) and the third input port (W +) are connected with a first chip U1, and the fourth input port (V-), the fifth input port (U-) and the sixth input port (W-) are connected with a second chip U2.
Referring to FIG. 2, in a preferred embodiment, the signal output ports include a first output port (PV +), a second output port (PU +), a third output port (PW +), a fourth output port (PV-), a fifth output port (PU-), and a sixth output port (PW-).
The first output port (PV +), the second output port (PU +), the third output port (PW +) are connected with the first chip U1, and the fourth output port (PV-), the fifth output port (PU-), and the sixth output port (PW-) are connected with the second chip U2.
The main control module respectively outputs six paths of PWM signals to a first input port (V +), a second input port (U +), a third input port (W +), a fourth input port (V-), a fifth input port (U-) and a sixth input port (W-), and then outputs six paths of signal output ports to a driving optical coupler of the IGBT module through a first output port (PV +), a second output port (PU +), a third output port (PW +), a fourth output port (PV-), a fifth output port (PU-) and a sixth output port (PW-).
Each signal input port corresponds to one IGBT bridge arm, and the six signal input ports correspond to six IGBT bridge arms.
The first chip U1 and the second chip U2 are SN74LV125ADR, and the first chip U1 and the second chip U2 are single-ended to differential chips, so that signal differentiation is achieved, and the anti-interference capability of signals in the transmission process is improved.
In another preferred embodiment, one end of a fifth resistor R5 is connected between the first chip U1 and the first input port (V +), one end of a sixth resistor R6 is connected between the first chip U1 and the second input port (U +), one end of a seventh resistor R7 is connected between the first chip U1 and the third input port (W +), and the other end of the sixth resistor R6, the other end of the seventh resistor R7, and the other end of the fifth resistor R5 are connected and then grounded.
The resistance parameters of the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 are 4K 7-J.
Through the arrangement of the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7, the PWM signal input to the first chip U1 by the master control module can be more stable, and the interference of harmonic waves and noise waves is reduced.
Fig. 2 is further provided with a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R8, and the connection manner thereof can be intuitively understood in fig. 2, the resistance parameters of the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are 51R-J, and the resistance parameter of the resistor R8 is the same as the resistance parameters of the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7.
In another preferred embodiment, one end of a sixteenth resistor R16 is connected between the second chip U2 and the fourth input port (V-), one end of a seventeenth resistor R17 is connected between the second chip U2 and the fifth input port (U-), one end of an eighteenth resistor R18 is connected between the second chip U2 and the sixth input port (W-), and the other end of the sixteenth resistor R16, the other end of the seventeenth resistor R17, and the other end of the eighteenth resistor R18 are connected and then grounded.
The resistance parameters of the sixteenth resistor R16, the seventeenth resistor R17 and the eighteenth resistor R18 are 4K 7-J.
The sixteenth resistor R16, the seventeenth resistor R17 and the eighteenth resistor R18 can enable the PWM signal input to the second chip U2 by the master control module to be more stable, and reduce interference of harmonic waves and noise waves.
Fig. 2 is further provided with a resistor R12, a resistor R13, a resistor R14, a resistor R15 and a resistor R19, and the connection manner of the resistors can be directly and intuitively understood from fig. 2, wherein the resistance parameters of the resistor R12, the resistor R13, the resistor R14 and the resistor R15 are 51R-J, and the resistance parameter of the resistor R19 is 4K 7-J.
The resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R12, the resistor R13, the resistor R14 and the resistor R15 are arranged, so that the current limiting and voltage dividing functions can be achieved, and in other embodiments, the current limiting and voltage dividing functions can also be achieved as a safety resistor and the like.
Referring to fig. 2, a first filter circuit is disposed between the first output port (PV +) and the first chip U1 module, a second filter circuit is disposed between the second output port (PU +) and the first chip U1, and a third filter circuit is disposed between the third output port (PW +) and the first chip U1.
The first filter circuit comprises a capacitor C1 and a resistor R9, the second filter circuit comprises a capacitor C2 and a resistor R10, and the third filter circuit comprises a capacitor C3 and a resistor R11.
Through setting up first filter circuit, second filter circuit and third filter circuit, can effectual filtering clutter, prevent that output signal from being disturbed by the clutter.
Referring to fig. 2, a fourth filter circuit is disposed between the fourth output port (PV-) and the second chip U2, a fifth filter circuit is disposed between the fifth output port (PU-) and the second chip U2, and a sixth filter circuit is disposed between the sixth output port (PW-) and the second chip U2.
The fourth filter circuit comprises a resistor R20 and a capacitor C6, the fifth filter circuit comprises a resistor R21 and a capacitor C7, and the sixth filter circuit comprises a resistor R22 and a capacitor C8.
Through setting up fourth filter circuit, fifth filter circuit and sixth filter circuit can effectual filtering clutter, prevent that output signal from being disturbed by the clutter.
The first filter circuit, the second filter circuit, the third filter circuit, the fourth filter circuit, the fifth filter circuit and the sixth filter circuit are RC filter circuits.
Referring to fig. 3, in the present embodiment, the flip-flop U3 is a class D flip-flop having eight pins (pins 1-8), each of which and the manner in which it is connected to the components is best seen in fig. 3.
It should be noted that pin 1 of the flip-flop U3 is connected to a reset circuit, and pin 2 of the flip-flop U3 is connected to the IGBT module and receives a trigger signal sent by the IGBT module.
In a preferred embodiment, one end of a twenty-fifth resistor R25 is further connected between the flip-flop U3 and the IGBT module, one end of a twenty-fourth resistor R24 is further connected between the flip-flop U3 and the reset circuit, and the other end of the twenty-fourth resistor R24 is connected to the other end of the twenty-fifth resistor R25, and then is connected to the second power supply.
The resistance parameters of the twenty-fourth resistor R24 and the twenty-fifth resistor R25 are 4K7-J, and the voltage of the second power supply is + 5V.
The twenty-fourth resistor R24 and the twenty-fifth resistor R25 are used for limiting current and dividing voltage, so that the output current of the second power supply is prevented from being overlarge.
In a preferred embodiment, one end of a twelfth capacitor C12 is further connected between the flip-flop U3 and the IGBT module, one end of an eleventh capacitor C11 is further connected between the flip-flop U3 and the reset circuit, and the other end of the eleventh capacitor C11 is connected to the other end of the twelfth capacitor C12 and then grounded.
By arranging the eleventh capacitor C11 and the twelfth capacitor C12, harmonic waves are filtered, and the signals are ensured not to be interfered in the transmission process.
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 (10)
1. A PWM signal locking circuit of a servo driver, comprising: a signal output circuit and a lock circuit;
the signal output circuit comprises a signal input port and a signal output port, the signal input port is connected with the main control module and used for receiving PWM signals, the signal output port is connected with the IGBT module and used for outputting the PWM signals to the IGBT module, a control chip is arranged between the signal input port and the signal output port and used for controlling the output of the PWM signals;
a trigger and a reset circuit connected with the trigger are arranged in the locking circuit;
the trigger is used for judging whether an alarm signal sent by the IGBT module is received or not, if so, the alarm signal is forwarded to the main control module and the control chip and enters a locking state, and the control chip receives the alarm signal and locks the PWM signal to turn off the IGBT module;
the reset circuit is used for sending a reset signal to the trigger, when the trigger receives the reset signal, the trigger releases the locking state and sends an unlocking signal to the control chip, and the control chip unlocks the PWM signal to start the IGBT module.
2. The PWM signal locking circuit of the servo driver as claimed in claim 1, wherein a twenty-fifth resistor is connected between the trigger and the IGBT module, a twenty-fourth resistor is connected between the trigger and the reset circuit, and the other end of the twenty-fourth resistor is connected to a second power supply after being connected to the other end of the twenty-fifth resistor.
3. The PWM signal locking circuit of the servo driver according to claim 1, wherein one end of a twelfth capacitor is further connected between the trigger and the IGBT module, one end of an eleventh capacitor is further connected between the trigger and the reset circuit, and the other end of the eleventh capacitor is connected with the other end of the twelfth capacitor and then grounded.
4. The PWM signal locking circuit of the servo driver as claimed in claim 1, wherein the control chip comprises a first chip and a second chip, the signal input ports comprise a first input port, a second input port, a third input port, a fourth input port, a fifth input port, and a sixth input port, the first input port, the second input port, and the third input port are connected to the first chip, and the fourth input port, the fifth input port, and the sixth input port are connected to the second chip.
5. The PWM signal locking circuit of the servo driver as claimed in claim 4, wherein a terminal of a fifth resistor is connected between the first chip and the first input port, a terminal of a sixth resistor is connected between the first chip and the second input port, a terminal of a seventh resistor is connected between the first chip and the third input port, and the other terminal of the fifth resistor, the other terminal of the sixth resistor, and the other terminal of the seventh resistor are connected and then grounded.
6. The PWM signal locking circuit of the servo driver as claimed in claim 4, wherein a sixteenth resistor is connected between the second chip and the fourth input port, a seventeenth resistor is connected between the second chip and the fifth input port, an eighteenth resistor is connected between the second chip and the sixth input port, and the other end of the sixteenth resistor, the other end of the seventeenth resistor and the other end of the eighteenth resistor are connected and then grounded.
7. The PWM signal locking circuit of the servo driver as claimed in claim 4, wherein the signal output ports comprise a first output port, a second output port, a third output port, a fourth output port, a fifth output port and a sixth output port, the first output port, the second output port and the third output port are connected to the first chip, and the fourth output port, the fifth output port and the sixth output port are connected to the second chip.
8. The PWM signal locking circuit of a servo driver as claimed in claim 7, wherein a first filter circuit is connected between the first output port and the first chip, a second filter circuit is connected between the second output port and the first chip, and a third filter circuit is connected between the third output port and the first chip.
9. The PWM signal locking circuit of the servo driver as claimed in claim 7, wherein a fourth filter circuit is connected between the fourth output port and the second chip, a fifth filter circuit is connected between the fifth output port and the second chip, and a sixth filter circuit is connected between the sixth output port and the second chip.
10. The PWM signal locking circuit of the servo driver as claimed in claim 8, wherein the first filter circuit, the second filter circuit, the third filter circuit, the fourth filter circuit, the fifth filter circuit and the sixth filter circuit are RC filter circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920394594.7U CN210167795U (en) | 2019-03-26 | 2019-03-26 | PWM signal locking circuit of servo driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920394594.7U CN210167795U (en) | 2019-03-26 | 2019-03-26 | PWM signal locking circuit of servo driver |
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| Publication Number | Publication Date |
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| CN210167795U true CN210167795U (en) | 2020-03-20 |
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| CN201920394594.7U Expired - Fee Related CN210167795U (en) | 2019-03-26 | 2019-03-26 | PWM signal locking circuit of servo driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110021909A (en) * | 2019-03-26 | 2019-07-16 | 宁波安信数控技术有限公司 | A kind of pwm signal lock-in circuit of servo-driver |
-
2019
- 2019-03-26 CN CN201920394594.7U patent/CN210167795U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110021909A (en) * | 2019-03-26 | 2019-07-16 | 宁波安信数控技术有限公司 | A kind of pwm signal lock-in circuit of servo-driver |
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Granted publication date: 20200320 |