CN113300545B - Matching circuit of motor driver - Google Patents
Matching circuit of motor driver Download PDFInfo
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- CN113300545B CN113300545B CN202110338138.2A CN202110338138A CN113300545B CN 113300545 B CN113300545 B CN 113300545B CN 202110338138 A CN202110338138 A CN 202110338138A CN 113300545 B CN113300545 B CN 113300545B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/40—Structural association with grounding devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The invention discloses a motor driver matching circuit, which comprises an input signal matching circuit, an output signal matching circuit, a driving signal matching circuit and an external interface circuit, wherein the input signal matching circuit of the circuit matches input signals and then inputs the input signals into a motor driver; the output signal matching circuit matches the signal output by the motor driver and then outputs the signal to the outside; the driving signal matching circuit matches and outputs the motor driving signals output by the motor driver; the input and output signals of the motor driver are matched and then input and output by the external interface circuit. The matching input and output of signals can be realized, and the problems that the driving of the motor is failed or unstable due to the fact that the signals of the input end and the output end of the driver are attenuated, interfered or not matched and the like, the driving of the motor is failed or unstable by the driver, the driving of the motor is failed due to communication and the like are avoided. In addition, the external interface circuit adopts on-board wiring, so that the problem of insufficient soldering caused by the connection of a standard driver in a connecting wire mode can be avoided.
Description
Technical Field
The invention relates to the technical field of motor drive circuit equipment, in particular to a motor driver matching circuit.
Background
The motor is usually driven by a driver, and the driver usually outputs a driving signal to drive the motor to rotate. In the prior art, a mature driver is adopted to output a driving signal to drive the motor to rotate. However, if the motor is directly driven by the signal output by the mature driver, the signal at the input/output end of the driver may be attenuated, interfered or mismatched, which may cause the failure or instability of driving of the motor by the driver, or cause the failure of driving the motor due to communication caused by signal attenuation. In addition, drive motor through adopting ripe driver, need be connected to the external interface through each signal line of connecting wire with the driver on, because the welding of connecting wire appears rosin joint scheduling problem like this, probably leads to driver drive trouble, unable normal driving motor rotates.
Disclosure of Invention
The present invention is directed to solving, at least in part, one of the technical problems in the related art. To this end, it is an object of the invention to propose a motor driver matching circuit.
To achieve the above object, an embodiment of the present invention provides a motor driver matching circuit, including:
the input signal matching circuit is connected with the motor driver so as to match input signals and then input the input signals to the motor driver;
the output signal matching circuit is connected with the motor driver so as to match signals output by the motor driver and then output the signals;
the driving signal matching circuit is connected with the motor driver so as to match and output a motor driving signal output by the motor driver;
and the external interface circuit is respectively connected with the input signal matching circuit, the output signal matching circuit and the driving signal matching circuit so as to input and output the input and output signals of the motor driver after matching.
Further, according to an embodiment of the present invention, the input signal matching circuit includes:
an analog input signal matching circuit, the analog signal matching circuit comprising: the positive end of the amplifier U1, the positive end of the amplifier U1 is connected with an input analog signal through a resistor R54, the positive end of the amplifier U1 is further connected with an analog reference ground through a resistor R57, the positive end of the amplifier U1 is further connected with a power supply through a resistor R56, the negative end resistor R53 of the amplifier U1 is connected with the analog reference ground, the negative end of the amplifier U1 is further connected with the output end of the amplifier U1 through a resistor R55 and a capacitor C1, and the output end of the amplifier U1 is further connected with a signal input end of the motor driver.
Further, according to an embodiment of the present invention, the analog input signal matching circuit further includes: the amplifier U1 comprises a resistor R58 and a variable resistor R60, wherein the positive terminal of the amplifier U1 is connected with an external input signal through the resistor R58 and the variable resistor R60; wherein the content of the first and second substances,
one end of the resistor R58 is connected to the input signal, the other end of the resistor R58 is connected to one end of the variable resistor R60, the other end of the variable resistor R60 is connected to a circuit reference ground, and a voltage regulation and control end of the variable resistor R60 is connected to a positive terminal of the amplifier U1.
Further, according to an embodiment of the present invention, the analog input signal matching circuit further includes:
a resistor R59, one end of the resistor R59 is connected with the other end of the resistor R58, and the other end of the resistor R59 is connected with the negative end of the amplifier U1;
a zener diode D2, the negative terminal of the zener diode D2 being connected to the negative terminal of the amplifier U1, the positive terminal of the zener diode D2V being connected to the circuit reference ground.
Further, according to an embodiment of the present invention, the analog input signal matching circuit further includes: a zener diode D1, a negative terminal of the zener diode D1 being connected to the other terminal of the resistor R58, and the other terminal of the zener diode D1 being connected to circuit reference ground.
Further, according to an embodiment of the present invention, the input signal matching circuit further includes: a digital input signal matching circuit, the digital input signal matching circuit comprising:
one end of the resistor R50 is connected with an external input digital signal, and the other end of the resistor R50 is connected with a digital signal input end of the motor driver;
a resistor R51, one end of the resistor R51 being connected to the one end of the resistor R50, the other end of the resistor R51 being connected to a digital reference ground.
Further, according to an embodiment of the present invention, the output signal matching circuit includes:
the grid electrode of the MOS tube Q1 is connected with the signal output end of the motor driver, the source electrode of the MOS tube Q1 is connected with a digital reference ground, the drain electrode of the MOS tube Q1 is connected with a pull-up power source through a resistor, and the drain electrode of the MOS tube Q1 is further connected with an external device or a motor driving end.
Further, according to an embodiment of the present invention, the driving signal matching circuit includes:
the grid electrode of the MOS tube Q2 is connected with the first driving signal output end of the motor driver, and the drain electrode of the MOS tube Q2 is connected with the positive end of the motor driving power supply;
a gate of the MOS transistor Q3 is connected with a second driving signal output end of the motor driver, a drain of the MOS transistor Q3 is connected with a source of the MOS transistor Q2, a source of the MOS transistor Q3 is further connected with a negative end of the motor driving power supply, and a common end of the MOS transistor Q2 and the MOS transistor Q3 is further connected with a motor;
and two ends of the filter circuit are respectively connected with two ends of the motor driving power supply so as to provide a stable power supply for the motor.
Further, according to an embodiment of the present invention, the external interface circuit includes:
the first connector is respectively connected with the input signal matching circuit, the output signal matching circuit and the driving signal matching circuit so as to input and output the input and output signals of the motor driver after matching;
the first pair of external connectors are connected with the first connector and used for being connected with external equipment or a motor.
Further, according to an embodiment of the present invention, the external interface circuit includes:
a first optocoupler through which the first pair of external connectors is connected with the first connector.
The motor driver matching circuit provided by the embodiment of the invention is connected with the motor driver through the input signal matching circuit so as to input the input signal to the motor driver after matching; the output signal matching circuit is connected with the motor driver so as to match signals output by the motor driver and then output the signals to the outside; the driving signal matching circuit is connected with the motor driver so as to match and output the motor driving signals output by the motor driver; and the external interface circuit is respectively connected with the input signal matching circuit, the output signal matching circuit and the driving signal matching circuit so as to match the input and output signals of the motor driver and then input and output the signals. Therefore, the matched input and output of signals can be realized, and the problems that the drive of the driver to the motor fails or the drive is unstable due to attenuation, interference or mismatching of the signals of the input end and the output end of the driver, or the motor fails to be driven due to communication caused by signal attenuation and the like are avoided. In addition, the external interface circuit adopts on-board wiring, so that the problem of insufficient soldering caused by the connection of a standard driver in a connecting wire mode can be avoided.
Drawings
Fig. 1 is a block diagram of a matching circuit of a motor driver according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an analog input signal matching circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another analog input signal matching circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a digital input signal matching circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an output signal matching circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a driving signal matching circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an external interface circuit according to an embodiment of the present invention.
Reference numerals are as follows:
a motor driver 10;
an input signal matching circuit 20;
an output signal matching circuit 30;
a drive signal matching circuit 40;
an external interface circuit 50;
a motor 60;
a communication device 70.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, an embodiment of the present invention provides a matching circuit of a motor driver 10, including: the motor driver comprises an input signal matching circuit 20, an output signal matching circuit 30, a driving signal matching circuit 40 and an external interface circuit 50, wherein the input signal matching circuit 20 is connected with the motor driver 10 so as to match input signals and then input the input signals to the motor driver 10; as shown in fig. 1, in the connection with the electronic device such as communication through the standard motor driver 10, the standard driver may not read the input signal because the signal output by the electronic device such as communication or other devices cannot be matched with the standard motor driver 10, and thus the electronic device such as external communication or other devices may not communicate with the standard driver or normally transmit the signal, thereby causing a failure in signal transmission. Through the input signal matching circuit 20, signals output by electronic equipment such as communication equipment or other equipment are converted and matched into signals which can be read by the standard motor 60, so that the standard motor 60 can normally read the input signals.
The output signal matching circuit 30 is connected with the motor driver 10, and signals output by the motor driver 10 are output outwards after being matched; as shown in fig. 1, in the standard driver output signal, it may be that the peripheral cannot read the signal output by the motor driver 10 because the signal cannot be matched with the peripheral signal, and the signal output by the standard motor driver 10 is matched by the output signal matching circuit 30 and then output to the external device, so that the external device can normally read the signal output by the driver.
The driving signal matching circuit 40 is connected with the motor driver 10, and the driving signal of the motor 60 output by the motor driver 10 is output after being matched; when driving the motor 60, the motor driver 10 needs to output a matching signal to the motor 60 to drive the motor 60. However, the driving signal output from the standard motor 60 may not directly drive the motor 60, so that the driving of the motor 60 fails. The driving signal matching circuit 40 can match the driving signal output by the standard motor 60 and then drive the motor 60, so that various types of motors 60 can be better driven.
The external interface circuit 50 is respectively connected to the input signal matching circuit 20, the output signal matching circuit 30 and the driving signal matching circuit 40, so as to match the input and output signals of the motor driver 10 and then input and output the signals. As shown in fig. 1, the signals matched by the input signal matching circuit 20, the output signal matching circuit 30 and the driving signal matching circuit 40 can be connected to an external device or a motor 60 through the external interface, so as to realize the input and output of the signals. In addition, the external interface circuit 50 can avoid the problem of cold joint caused by connecting the standard driver by using a connecting wire.
The matching circuit of the motor driver 10 provided by the embodiment of the invention is connected with the motor driver 10 through the input signal matching circuit 20, so that the input signal is matched and then input into the motor driver 10; the output signal matching circuit 30 is connected with the motor driver 10, and signals output by the motor driver 10 are output outwards after being matched; the driving signal matching circuit 40 is connected with the motor driver 10, and the driving signal of the motor 60 output by the motor driver 10 is output after being matched; the external interface circuit 50 is respectively connected to the input signal matching circuit 20, the output signal matching circuit 30 and the driving signal matching circuit 40, so as to match the input and output signals of the motor driver 10 and then input and output the signals. Therefore, the matched input and output of signals can be realized, and the problems that the drive of the driver to the motor 60 fails or the drive is unstable due to attenuation, interference or mismatching of the signals at the input end and the output end of the driver, or the motor 60 fails to be driven due to communication caused by signal attenuation and the like are avoided. In addition, the external interface circuit 50 can avoid the problem of cold joint caused by connecting the standard driver by using a connecting wire.
Referring to fig. 2, the input signal matching circuit 20 includes: an analog input signal matching circuit 20, said analog signal matching circuit comprising: the positive end of an amplifier U1, an amplifier U1 is connected with an input analog signal through a resistor R54, the positive end of an amplifier U1 is further connected with an analog reference ground through a resistor R57, the positive end of an amplifier U1 is further connected with a power supply through a resistor R56, a negative end resistor R53 of the amplifier U1 is connected with the analog reference ground, the negative end of the amplifier U1 is further connected with the output end of the amplifier U1 through a resistor R55 and a capacitor C1, and the output end of the amplifier U1 is further connected with a signal input end of the motor driver. As shown in fig. 2, an amplifier circuit is formed by the amplifier U1, and an external input signal can be processed and output to a signal input end of the driver through the AnIn terminal by the amplifier circuit, so that the signal can meet the signal reading requirement of the driver. After an input external input signal is input through the AnIn end, under the isolation amplification effect of the amplifier U1, the output signal cannot be too low, and the supply voltage of the amplifier cannot be exceeded, so that the external output signal can be well read, and the driver is prevented from being burnt out by high voltage.
Referring to fig. 3, the analog input signal matching circuit 20 further includes: a resistor R58 and a variable resistor R60, the positive terminal of the amplifier U1 is connected with an external input signal through the resistor R58 and the variable resistor R60; one end of the resistor R58 is connected to the input signal, the other end of the resistor R58 is connected to one end of the variable resistor R60, the other end of the variable resistor R60 is connected to a circuit reference ground, and a voltage regulation and control end of the variable resistor R60 is connected to a positive end of the amplifier U1. As shown in fig. 3, the resistor R58 and the variable resistor R6 are connected in series to form a voltage divider circuit, so that an external input signal Up can be divided and then input to the positive terminal of the amplifier U1, and the transformed input signal can meet the signal requirement of the amplifier U1. Additionally, by adjusting the variable resistor R60, the voltage output to the positive terminal of the amplifier U1 can be further adjusted.
Referring to fig. 3, the analog input signal matching circuit 20 further includes: a resistor R59 and a voltage stabilizing diode D2, wherein one end of the resistor R59 is connected with the other end of the resistor R58, and the other end of the resistor R59 is connected with the negative end of the amplifier U1; the negative terminal of the zener diode D2 is connected to the negative terminal of the amplifier U1, and the positive terminal of the zener diode D2 is connected to the circuit reference ground. The analog reference ground of the negative terminal of the amplifier U1 can be isolated from circuit ground by the zener diode D2. And the overvoltage conductivity of the voltage stabilizing diode D2 can ensure that the voltage of the negative terminal of the amplifier U1 does not exceed a set value. Further protecting the negative terminal of the amplifier U1, in one embodiment of the invention, the zener diode D2 is a 10V zener diode.
Referring to fig. 3, the analog input signal matching circuit 20 further includes: a zener diode D1, the negative terminal of the zener diode D1 being connected to the other terminal of the resistor R58, the other terminal of the zener diode D1 being connected to circuit reference ground. As shown in fig. 3, the voltage regulator diode D1 is provided across the variable resistor R60. In this way, the voltage across the variable resistor R60 can be limited, ensuring that the positive terminal voltage of the amplifier U1 does not exceed a set value. The positive terminal of the amplifier U1 is further protected and in one embodiment of the invention, the zener diode D1 is a 20V zener diode.
Referring to fig. 4, the input signal matching circuit 20 further includes: digital input signal matching circuit 20, digital input signal matching circuit 20 includes: a resistor R50 and a resistor R51, wherein one end of the resistor R50 is connected with an external input digital signal, and the other end of the resistor R50 is connected with a digital signal input end of the motor driver 10; one end of the resistor R51 is connected to the one end of the resistor R50, and the other end of the resistor R51 is connected to a digital reference ground. As shown In fig. 4, a voltage divider circuit is formed between the resistor R50 and the resistor R51, so that an externally input digital signal In can be divided and output to the digital input terminal of the motor driver 10. In this way, damage to the motor driver 10 by an excessively high voltage signal is avoided.
Referring to fig. 5, the output signal matching circuit 30 includes: the gate of the MOS transistor Q1 is connected with the signal output end of the motor driver 10, the source of the MOS transistor Q1 is connected with a digital reference ground, the drain of the MOS transistor Q1 is connected with a pull-up power source through a resistor, and the drain of the MOS transistor Q1 is further connected with the driving end of an external device or a motor 60. As shown in fig. 5, the MOS transistor Q1 can convert the output signal of the motor driver 10 into a signal of a driving control terminal of the motor 60 or a received signal of an external device, so as to meet the requirement of the external device or the signal of the driving terminal of the motor 60. For example, when the output signal of the motor driver 10 is high, the MOS transistor Q1 is turned on, and the turned-on drain of the MOS transistor Q1 outputs a low signal referenced to the ground. When the output signal of the motor driver 10 is at a low level, the MOS transistor Q1 is turned off, and the drain of the MOS transistor Q1 that is turned on outputs a high level signal of the pull-Up voltage Up, so that the requirement of the input signal can be met by changing the pull-Up voltage Up.
Referring to fig. 6, the driving signal matching circuit 40 includes: the MOS transistor Q2, the MOS transistor Q3 and the filter circuit, the grid electrode of the MOS transistor Q2 is connected with the first driving signal output end of the motor driver 10, and the drain electrode of the MOS transistor Q2 is connected with the positive end of the driving power supply of the motor 60; the gate of the MOS transistor Q3 is connected to the second driving signal output end of the motor driver 10, the drain of the MOS transistor Q3 is connected to the source of the MOS transistor Q2, the source of the MOS transistor Q3 is further connected to the negative terminal of the driving power supply of the motor 60, and the common terminals of the MOS transistor Q2 and the MOS transistor Q3 are further connected to the motor 60; at some times, the driving signal output by the motor driver 10 cannot drive the motor 60 to rotate, and the MOS transistor Q2 and the MOS transistor Q3 form an amplifying circuit, so that the signal input by the motor driver 10 can be amplified and then output to the motor 60, and the motor 60 provides the driving signal meeting the driving requirement of the motor 60. The power supply of the motor 60 can be selected according to the requirement of the motor 60 so as to meet the driving requirement of the motor 60.
And two ends of the filter circuit are respectively connected with two ends of the driving power supply of the motor 60 so as to provide a stable power supply for the motor 60. As shown in fig. 6, the filter circuit includes a zener diode D3 and a capacitor C2, and the zener diode D3 and the capacitor C2 are respectively connected in parallel to two ends of the driving power supply of the motor 60, so as to ensure the stability of the driving power supply of the motor 60.
Referring to fig. 7, the external interface circuit 50 includes: a first connector and a first pair of external connectors, wherein the first connector is respectively connected with the input signal matching circuit, the output signal matching circuit 30 and the driving signal matching circuit 40, so as to match the input and output signals of the motor driver 10 and then input and output the matched signals; the first connector can lead out all the matched external interfaces of the motor driver 10.
The first pair of external connectors is connected to the first connector for connection to an external device or motor 60. As shown in fig. 7, the first pair of external connectors may be provided in plural, and may be respectively connected to the external communication apparatus 70, the driven motor 60, the power supply source, or the like through each of the first pair of external connectors. The first pair of external connectors are connected with the first connector in a circuit board mode, so that the problems that false soldering or connecting line abrasion phenomena are easy to generate by adopting a single connecting line mode, signal transmission fails and the like can be avoided.
Referring to fig. 7, the external interface circuit includes: a first optocoupler, through which the first pair of external connectors are connected with the first connector. Through first opto-coupler can further keep apart output signal and motor driver 10's input/output signal, so, can further guarantee motor driver 10's input/output signal's stability.
In one embodiment of the invention, the first pair of external connectors is connected to the motor driver 10 through the first optical coupler therebetween. And the adaptation of signals is realized through optical couplers. .
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments. All equivalent structures made by using the contents of the specification and the attached drawings of the invention can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that those skilled in the art may make variations, modifications, substitutions and alterations within the scope of the present invention without departing from the spirit and scope of the present invention.
Claims (7)
1. A motor driver matching circuit, comprising:
the input signal matching circuit is connected with the motor driver so as to match input signals and then input the input signals to the motor driver;
the output signal matching circuit is connected with the motor driver so as to match signals output by the motor driver and then output the signals;
the driving signal matching circuit is connected with the motor driver and is used for matching and outputting the motor driving signals output by the motor driver;
the external interface circuit is respectively connected with the input signal matching circuit, the output signal matching circuit and the driving signal matching circuit so as to match the input and output signals of the motor driver and then input and output the matched signals;
wherein the content of the first and second substances,
the input signal matching circuit includes:
an analog input signal matching circuit, the analog input signal matching circuit comprising: an amplifier U1, a positive terminal of the amplifier U1 is connected to an input analog signal through a resistor R54, a positive terminal of the amplifier U1 is further connected to an analog reference ground through a resistor R57, a positive terminal of the amplifier U1 is further connected to a power supply through a resistor R56, a negative terminal resistor R53 of the amplifier U1 is connected to the analog reference ground, a negative terminal of the amplifier U1 is further connected to an output terminal of the amplifier U1 through a resistor R55 and a capacitor C1, and an output terminal of the amplifier U1 is further connected to a signal input terminal of the motor driver;
a digital input signal matching circuit, the digital input signal matching circuit comprising: one end of the resistor R50 is connected with an external input digital signal, and the other end of the resistor R50 is connected with a digital signal input end of the motor driver; one end of the resistor R51 is connected with the one end of the resistor R50, and the other end of the resistor R51 is connected with a digital reference ground;
wherein the content of the first and second substances,
the drive signal matching circuit includes:
the grid electrode of the MOS tube Q2 is connected with the first driving signal output end of the motor driver, and the drain electrode of the MOS tube Q2 is connected with the positive end of the motor driving power supply;
a gate of the MOS transistor Q3 is connected to a second driving signal output end of the motor driver, a drain of the MOS transistor Q3 is connected to a source of the MOS transistor Q2, a source of the MOS transistor Q3 is further connected to a negative end of the motor driving power supply, and a common end of the MOS transistor Q2 and the MOS transistor Q3 is further connected to the motor;
and two ends of the filter circuit are respectively connected with two ends of the motor driving power supply so as to provide a stable power supply for the motor.
2. The motor driver matching circuit of claim 1, wherein the analog input signal matching circuit further comprises: a resistor R58 and a variable resistor R60, the positive terminal of the amplifier U1 is connected with an external input signal through the resistor R58 and the variable resistor R60; wherein the content of the first and second substances,
one end of the resistor R58 is connected to the input signal, the other end of the resistor R58 is connected to one end of the variable resistor R60, the other end of the variable resistor R60 is connected to a circuit reference ground, and a voltage regulation and control end of the variable resistor R60 is connected to a positive terminal of the amplifier U1.
3. The motor driver matching circuit of claim 2, wherein the analog input signal matching circuit further comprises:
a resistor R59, one end of the resistor R59 is connected with the other end of the resistor R58, and the other end of the resistor R59 is connected with the negative end of the amplifier U1;
a zener diode D2, the negative terminal of the zener diode D2 being connected to the negative terminal of the amplifier U1, the positive terminal of the zener diode D2V being connected to the circuit reference ground.
4. The motor driver matching circuit of claim 3, wherein the analog input signal matching circuit further comprises: a zener diode D1, the negative terminal of the zener diode D1 being connected to the other terminal of the resistor R58, the other terminal of the zener diode D1 being connected to circuit reference ground.
5. The motor driver matching circuit of claim 1, wherein the output signal matching circuit comprises:
the grid electrode of the MOS tube Q1 is connected with the signal output end of the motor driver, the source electrode of the MOS tube Q1 is connected with a digital reference ground, the drain electrode of the MOS tube Q1 is connected with a pull-up power source through a resistor, and the drain electrode of the MOS tube Q1 is further connected with an external device or a motor driving end.
6. The motor driver matching circuit of claim 1, wherein the external interface circuit comprises:
the first connector is respectively connected with the input signal matching circuit, the output signal matching circuit and the driving signal matching circuit so as to match the input and output signals of the motor driver and then input and output the signals;
the first pair of external connectors are connected with the first connector and used for being connected with external equipment or a motor.
7. The motor driver matching circuit of claim 6, wherein the external interface circuit comprises:
a first optocoupler, through which the first pair of external connectors are connected with the first connector.
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| CN1933310A (en) * | 2006-09-27 | 2007-03-21 | 周常柱 | Method for raizing drive circuit reliability and large power drive circuit |
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