CN112217180B - Matching circuit of rotary transformer and motor driving system - Google Patents
Matching circuit of rotary transformer and motor driving system Download PDFInfo
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- CN112217180B CN112217180B CN202010983251.1A CN202010983251A CN112217180B CN 112217180 B CN112217180 B CN 112217180B CN 202010983251 A CN202010983251 A CN 202010983251A CN 112217180 B CN112217180 B CN 112217180B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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Abstract
The embodiment of the application provides a matching circuit and motor drive system of resolver, resolver's matching circuit includes: the first input module is used for providing a modulated excitation signal; the power amplification module is used for carrying out power amplification on the modulated excitation signal to obtain a power signal, and the power signal comprises an alternating current signal component and a direct current signal component; the isolation module is used for isolating the direct current signal component in the power signal to obtain an alternating current signal component; the first output module is used for outputting the alternating current signal component to the rotary transformer. In the matching circuit of the rotary transformer, when the first output module has a short-circuit fault and short-circuit current occurs in the power signal obtained by the power amplification module, the isolation module can isolate the direct-current signal component in the power signal, can ensure that the variable quantity of the current input to the rotary transformer is within a controllable range, and ensures that the rotary transformer is not burnt, thereby improving the working stability of the rotary transformer.
Description
Technical Field
The application relates to the technical field of new energy vehicles, in particular to a matching circuit of a rotary transformer and a motor driving system.
Background
In a new energy automobile, a motor driving system is a driving mechanism of the whole automobile, and directly influences the power performance, the comfort level and the energy utilization rate of the automobile.
The inverter is a controller for controlling the output parameters of the motor on the new energy automobile, and controls the output power to drive the motor to work, so that the vehicle can run and stop. At present, a permanent magnet synchronous motor is generally adopted as a driving motor for a new energy automobile. In a permanent magnet synchronous motor control system, a rotary transformer is used as the most used measurement method for observing the position of a motor rotor. The resolver dynamically feeds back the motor signal to the inverter. Signals such as the rotational speed fed back by the resolver are further used in control calculation flows such as coordinate transformation and speed calculation. And finally, the inverter acquires the motor parameters through the rotary transformer, and the aim of precisely controlling the motor is fulfilled after operation.
In a general matching circuit scheme of the rotary transformer, a pair of complementary excitation signals are generated by using a special integrated chip mostly and are input into the rotary transformer through signal and power amplification.
However, in practical applications, due to environmental influences, such as vibrations during driving of the vehicle, short-circuiting of the output terminal of the matching circuit may occur, for example, the output terminal may be short-circuited to ground or a power supply, which may result in excessive current in the matching circuit, and eventually in circuit failure.
Disclosure of Invention
The embodiment of the application provides a matching circuit and motor drive system of rotary transformer, can be when the short-circuit fault takes place for the circuit, keep apart most electric current in the short-circuit current, guarantee that the change volume of the electric current of inputing rotary transformer is in controllable range, improve rotary transformer's job stabilization nature.
The embodiment of the application provides a matching circuit of resolver, includes:
the first input module is used for providing a modulated excitation signal;
the power amplification module is electrically connected with the first input module and is used for receiving the modulated excitation signal input by the first input module and performing power amplification on the modulated excitation signal to obtain a power signal, wherein the power signal comprises an alternating current signal component and a direct current signal component;
the isolation module is electrically connected with the power amplification module and is used for receiving the power signal input by the power amplification module and isolating a direct current signal component in the power signal to obtain an alternating current signal component;
and the first output module is electrically connected with the isolation module and is used for receiving the alternating current signal component input by the isolation module and outputting the alternating current signal component to a rotary transformer.
An embodiment of the present application further provides a motor driving system, including:
an inverter for outputting a driving signal and a driving signal;
the motor is electrically connected with the inverter and is used for running under the driving of the driving signal;
the matching circuit of the rotary transformer is electrically connected with the inverter and is used for processing the excitation signal and outputting the processed excitation signal;
and the rotary transformer is electrically connected with a matching circuit of the rotary transformer, and is used for outputting a feedback signal according to the processed excitation signal, and the feedback signal is used for acquiring the running parameters of the motor.
In the matching circuit of resolver that this application embodiment provided, when short-circuit fault takes place for first output module, when short-circuit current appears in the power signal that power amplification module obtained, isolation module can keep apart direct current signal component among the power signal, consequently can keep apart most electric current among the short-circuit current makes most electric current in the short-circuit current all unable input resolver, and the alternating current signal component of being inputed resolver has only superposed a small part electric current among the short-circuit current, consequently can guarantee to input resolver's electric current's change volume at controllable within range, guarantees that resolver is not burnt to improve resolver's job stabilization nature.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a first structure of a motor drive system according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a first structure of a matching circuit of a resolver according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of a power signal obtained by the power amplification module according to the embodiment of the present application.
Fig. 4 is a schematic diagram of an ac signal component obtained by the isolation module according to the embodiment of the present application.
Fig. 5 is a schematic diagram of a second structure of a matching circuit of a resolver according to an embodiment of the present disclosure.
Fig. 6 is a schematic diagram of a third structure of a matching circuit of a resolver according to an embodiment of the present disclosure.
Fig. 7 is a schematic diagram of a fourth structure of a matching circuit of a resolver according to an embodiment of the present disclosure.
Fig. 8 is a schematic diagram of a fifth structure of a matching circuit of a resolver according to an embodiment of the present disclosure.
Fig. 9 is a sixth schematic structure diagram of a matching circuit of a resolver according to an embodiment of the present disclosure.
Fig. 10 is a schematic diagram of a seventh structure of a matching circuit of a resolver according to an embodiment of the present disclosure.
Fig. 11 is a schematic structural diagram of a second structure of a motor driving system according to an embodiment of the present application.
Fig. 12 is a schematic structural diagram of a third structure of a motor drive system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a motor driving system which can be applied to vehicles, such as automobiles, so as to drive the automobiles to run.
Referring to fig. 1, fig. 1 is a schematic diagram of a first structure of a motor driving system 100 according to an embodiment of the present application. The motor drive system 100 includes an inverter 10, a motor 20, a matching circuit 30 of a resolver, and a resolver 40.
The inverter 10 is configured to output a driving signal and a driving signal. The driving signal is an alternating current signal, and the driving signal can be used for driving the motor to run.
The motor 20 may be used as a driving motor of a vehicle to drive the vehicle to run, for example, the motor 20 may be a permanent magnet synchronous motor. The motor 20 is electrically connected to the inverter 10, and a driving signal output from the inverter 10 may be input to the motor 20. The motor 20 is used for receiving the driving signal output by the inverter 10 and operating under the driving of the driving signal, so as to drive the automobile to run.
A matching circuit 30 of the resolver (hereinafter, simply referred to as a matching circuit 30) is electrically connected to the inverter 10, and a drive signal output from the inverter 10 may be input to the matching circuit 30. The matching circuit 30 is configured to receive the excitation signal output by the inverter 10, process the excitation signal, and output the processed excitation signal.
The rotary transformer 40 is electrically connected to the matching circuit 30, and the processed excitation signal output by the matching circuit 30 may be input to the rotary transformer 40. The rotary transformer 40 is configured to receive the processed excitation signal output by the matching circuit 30, and output a feedback signal according to the processed excitation signal. The feedback signal is used to acquire operating parameters of the motor 20, which may include, for example, the rotational direction, angle, and speed of the motor rotor. For example, the feedback signal output by the resolver 40 may be input into a vehicle computer or a control unit such as a microprocessor or microcontroller, and the control unit analyzes and calculates the feedback signal to obtain the operation parameters of the motor 20.
Referring to fig. 2, fig. 2 is a schematic diagram of a first structure of a matching circuit 30 of a resolver according to an embodiment of the present disclosure. The matching circuit 30 includes a first input module 31, a power amplifying module 32, an isolation module 33, and a first output module 34.
The first input module 31 is used for providing a modulated excitation signal. For example, the first input module 31 may be configured to modulate and filter the excitation signal output by the inverter 10 to obtain a modulated excitation signal. The modulated excitation signal comprises an alternating current signal component and a direct current signal component, i.e. the modulated excitation signal is a mixed signal of an alternating current signal and a direct current signal, or is understood to be an alternating current signal with a direct current bias. For example, the modulated excitation signal may be a sinusoidal signal with a dc offset.
The power amplification module 32 is electrically connected to the first input module 31, and the modulated excitation signal provided by the first input module 31 can be input to the power amplification module 32. The power amplifying module 32 is configured to receive the modulated driving signal input by the first input module 31, and perform power amplification on the modulated driving signal to obtain a power signal. It is understood that the power signal also includes an alternating current signal component and a direct current signal component, or that the power signal is an alternating current signal with a direct current bias. Wherein the dc signal component is the dc offset component.
It should be noted that, although the modulated excitation signal includes an ac signal component and a dc signal component, and the power signal also includes an ac signal component and a dc signal component, the modulated excitation signal and the power signal are different signals. Since the power signal is obtained by power amplification, the amplitude of the power signal is different from the amplitude of the modulated excitation signal, and the dc signal component included in the power signal may also be different from the dc signal component included in the modulated excitation signal.
The isolation module 33 is electrically connected to the power amplification module 32, and the power signal obtained by the power amplification module 32 may be input to the isolation module 33. The isolation module 33 is configured to receive the power signal input by the power amplification module 32, isolate a direct current signal component in the power signal to obtain the alternating current signal component, and output the alternating current signal component.
The first output module 34 is electrically connected to the isolation module 33, and the alternating current signal component output by the isolation module 33 can be input to the first output module 34. The first output module 34 is configured to receive the alternating current signal component input by the isolation module 33, and output the alternating current signal component to the rotary transformer 40, so as to drive the rotary transformer 40 to operate. Wherein the first output module 34 may include an output port.
Referring to fig. 3 and fig. 4 together, fig. 3 is a schematic diagram of a power signal obtained by the power amplification module 32 according to the embodiment of the present application, and fig. 4 is a schematic diagram of an alternating current signal component obtained by the isolation module 33 according to the embodiment of the present application.
Wherein the power signal comprises an alternating current signal component and a direct current signal component, e.g. a sinusoidal signal with a direct current offset. The amplitude of the alternating current signal component is, for example, 10V (volts), and the voltage of the direct current signal component is, for example, 15V, that is, the voltage of the direct current bias component is 15V. Therefore, the maximum voltage of the power signal is 25V, and the minimum voltage is 5V.
After the power signal is isolated by the isolation module 33, the direct current signal component in the power signal is filtered, so that the obtained alternating current signal component can be a sinusoidal signal. Therefore, the amplitude of the sinusoidal signal is 10V.
It can be understood that, in practical applications, due to the influence of external factors, when the first output module 34 has a short-circuit fault, for example, when the first output module 34 is short-circuited to ground or a power supply, a short-circuit current (fault current) occurs in the power signal obtained by the power amplification module 32, where the short-circuit current is mostly a direct current and a small short-circuit current is an alternating current. If the power signal is inputted to the resolver 40, the resolver 40 may be magnetically saturated, thereby burning out the resolver 40. In the matching circuit 30 of the present application, when a short-circuit current occurs in the power signal, the isolation module 33 may isolate a dc signal component in the power signal, so that most of the short-circuit current may be isolated, and most of the short-circuit current may not be input to the rotary transformer 40, and only a small current of the short-circuit current is superimposed on an ac signal component input to the rotary transformer 40, so that it may be ensured that a variation of the current input to the rotary transformer 40 is within a controllable range, and it is ensured that the rotary transformer 40 is not burned, thereby improving the operating stability of the rotary transformer 40.
In some embodiments, referring to fig. 5, fig. 5 is a schematic diagram of a second structure of the matching circuit 30 of the resolver according to an embodiment of the present disclosure. The matching circuit 30 further comprises a second input block 35 and a second output block 36.
In the description of the present application, it is to be understood that terms such as "first", "second", and the like are used merely to distinguish one similar element from another, and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated.
Wherein the second input module 35 is grounded.
The second output module 36 is electrically connected to the second input module 35. The second output module 36 and the first output module 34 are used to output the ac signal component obtained by the isolation module 33 to the resolver 40 together. Wherein, the second output module 36 may also include an output port.
It is understood that when the first output module 34 and the second output module 36 output the alternating current signal component to the rotary transformer 40 together, and the second input module 35 is grounded, the matching circuit 30 and the rotary transformer 40 may form a signal loop.
In the matching circuit 30 of the present application, since the isolation module 33 isolates the dc signal component in the power signal, that is, the ac signal component is obtained, so that it is not necessary to input the power signal through two differential circuits, only one bridge arm is needed, that is, the power amplification module 32 and the bridge arm where the isolation module 33 is located can implement power amplification and isolation of the modulated excitation signal, and input the ac signal to the resolver 40, and the second input module 35 and the second output module 36 do not need to be provided with the power amplification module and the isolation module in one path, so that the setting of the matching circuit 30 can be simplified.
It is understood that in some embodiments, when the rotary transformer 40 is grounded, for example, when one input terminal of the rotary transformer 40 is grounded, the path of the first output module 34 and the rotary transformer 40 may form a signal loop. In this case, the matching circuit 30 does not need to be provided with a second input block and a second output block, and thus the arrangement of the matching circuit 30 can be further simplified.
In some embodiments, referring to fig. 6, fig. 6 is a schematic diagram illustrating a third structure of the matching circuit 30 of the resolver according to an embodiment of the present disclosure. The matching circuit 30 further comprises a current limiting module 37.
The current limiting module 37 is electrically connected to the first input module 31 and the power amplifying module 32, that is, the current limiting module 37 is disposed between the first input module 31 and the power amplifying module 32. The current limiting module 37 may be configured to limit the magnitude of the current flowing through the power amplifying module 32 when the magnitude of the current flowing through the power amplifying module 32 reaches a preset current magnitude, for example, when the first output module 34 has a short-circuit fault. The preset current can be set according to actual conditions, for example, can be set to a suitable current according to experimental results.
It can be understood that when the first output module 34 has a short-circuit fault, a short-circuit current occurs in the power signal obtained by the power amplification module 32, and the short-circuit current is mostly a direct current and a small part is an alternating current. Although the dc current in the short-circuit current can be isolated by the isolation module 33, the ac current in the short-circuit current still causes the current input to the rotary transformer 40 to increase, thereby affecting the rotary transformer 40. And in the matching circuit 30 of this application, when short-circuit current appears in the power signal, if alternating current among the short-circuit current leads to the size of the electric current that flows through reaches predetermines the electric current size on the power amplification module 32, this moment current limiting module 37 can be right the size of the electric current that flows through on the power amplification module 32 is restricted, avoids the electric current that flows through is too big on the power amplification module 32 to can avoid importing resolver 40's electric current too big, guarantee that resolver 40 is not burnt, further improve resolver 40's job stabilization nature.
In some embodiments, referring to fig. 7, fig. 7 is a schematic diagram illustrating a fourth structure of the matching circuit 30 of the resolver according to an embodiment of the present disclosure.
The matching circuit 30 also includes a balancing resistance module 38. The balancing resistor module 38 is electrically connected to the power amplification module 32 and the isolation module 33, that is, the balancing resistor module 38 is disposed between the power amplification module 32 and the isolation module 33.
Wherein the balancing resistance module 38 may include one or more resistances. The balancing resistance module 38 may generate a voltage drop when the power amplification module 32 outputs the power signal.
In some embodiments, referring to fig. 8, fig. 8 is a schematic diagram illustrating a fifth structure of the matching circuit 30 of the resolver according to an embodiment of the present disclosure.
Wherein, the power amplifying module 32 includes a first transistor T1 and a second transistor T2.
The first transistor T1 comprises a first pin p 1 A second pin p 2 A third pin p 3 . The first pin p 1 Is electrically connected to a power supply V for inputting a voltage. The second pin p 2 Is electrically connected to the first input module 31, for example, through the current limiting module 37. The third pin p 3 Electrically connected to the balancing resistance module 38.
The second transistor T2 includes a fourth pin p 4 The fifth pin p 5 A sixth pin p 6 . The fourth pin p 4 Electrically connected to the balancing resistance module 38. The fifth pin p 5 Is electrically connected to the first input module 31, for example, via the current limiting module 37The modules 31 are electrically connected. The sixth pin p 6 And is grounded.
In some embodiments, the first transistor T1 and the second transistor T2 are both transistors. The first pin p 1 Is the collector of a triode, the second pin p 2 Being the base of a triode, said third pin p 3 Is the emitter of a triode. The fourth pin p 4 Is the collector of a triode, the fifth pin p 5 Is the base of a triode, the sixth pin p 6 Is the emitter of a triode.
When base p of triode T1 2 And emitter p 3 The voltage therebetween is greater than the conduction voltage of the transistor T1, for example, 0.7V, the transistor T1 is turned on. When the emitter p of the transistor T2 6 And base p 5 The voltage therebetween is greater than the turn-on voltage of the transistor T2, for example 0.7V, the transistor T2 is turned on. Therefore, the power amplification of the modulated excitation signal can be realized through the triodes T1 and T2, and the power signal is obtained.
In some embodiments, with continued reference to fig. 8, the isolation module 33 includes a capacitor C1. The capacitance value of the capacitor C1 may be set according to actual conditions, for example, according to experimental results.
In some embodiments, with continued reference to fig. 8, the current limiting module 37 includes a first diode D1 and a second diode D2.
Wherein the positive pole (+) of the first diode D1 and the second pin p 2 And (6) electrically connecting. The cathode (-) of the first diode D1 is connected between the balancing resistance module 38 and the isolation module 33.
The anode (+) of the second diode D2 is connected between the balancing resistance module 38 and the isolation module 33. A cathode (-) of the second diode D2 and the fifth pin p 5 And (6) electrically connecting.
It is understood that, in some embodiments, a resistor R3 may be further disposed between the first diode D1 and the first input module 31, and a resistor R4 may be further disposed between the second diode D2 and the first input module 31.
In some embodiments, with continued reference to fig. 8, the balancing resistance module 38 includes a first resistance R1 and a second resistance R2.
The first resistor R1 and the third pin p 3 The isolation module 33 is electrically connected. The second resistor R2 and the fourth pin p 4 The isolation module 33 is electrically connected.
It is understood that when the first output module 34 has a short-circuit fault, such as a short-circuit to ground, a short-circuit current may occur in the power signal output by the first transistor T1. At this time, the voltage drop across the first resistor R1 increases. When the voltage drop across the first resistor R1 is greater than the forward-direction turn-on voltage of the first diode D1, the first diode D1 is turned on, and at this time, the short-circuit current passes through the first diode D1 and returns to the ground through the first output module 34, so that the short-circuit current does not flow through the first transistor T1. Therefore, the current flowing through the first transistor T1 can be prevented from being too large, so as to limit the magnitude of the current flowing through the power amplification module 32.
When the first output module 34 is short-circuited, for example, short-circuited to a power supply, a short-circuit current may occur in the power signal output by the second transistor T2. At this time, the voltage drop across the second resistor R2 increases. When the voltage drop across the second resistor R2 is greater than the forward conduction voltage of the second diode D2, the second diode D2 is turned on, and at this time, a short-circuit current passes through the second diode D2 and passes through the sixth pin p 6 Back to ground, a short-circuit current therefore does not flow through the second transistor T2. Therefore, an excessive current flowing through the second transistor T2 can be avoided, and the current flowing through the power amplification module 32 can also be limited.
In some embodiments, referring to fig. 9, fig. 9 is a schematic diagram illustrating a sixth structure of the matching circuit 30 of the resolver according to an embodiment of the present disclosure. The first input module 31 includes a signal modulation circuit 311 and a first operational amplifier 312.
The excitation signal output by the inverter 10 may be input to the signal modulation circuit 311. The signal modulation circuit 311 is configured to receive a driving signal output by the inverter 10 and modulate the driving signal to generate a modulation signal.
The first operational amplifier 312 comprises a first input terminal p 7 A second input terminal p 8 And a first output terminal p 9 . The first input terminal p 7 And is electrically connected to the signal modulation circuit 311. Said second input terminal p 8 For inputting reference voltages, e.g. said second input terminal p 8 May be electrically connected to a reference power source Vref, from which the reference voltage is input. The reference power source Vref may input a voltage of 15V, for example. Thus, the first operational amplifier 312 can obtain a modulated driving signal according to the modulation signal and the reference voltage, and the first output terminal p 9 For outputting said modulated excitation signal.
In some embodiments, referring to fig. 10, fig. 10 is a schematic diagram illustrating a seventh structure of a matching circuit 30 of a resolver according to an embodiment of the present disclosure.
The first input module 31 further comprises a filter circuit 313. The filter circuit 313, the signal modulation circuit 311, and the first input terminal p 7 Is electrically connected, that is, the filter circuit 313 is arranged between the signal modulation circuit 311 and the first input terminal p 7 In between.
The modulation signal generated by the signal modulation circuit 311 is a Pulse Width Modulation (PWM) signal. The filter circuit 313 is configured to filter the pwm signal to generate a sinusoidal signal with a dc bias. The first input terminal p 7 For inputting the sinusoidal signal with a dc offset.
In some embodiments, the filter circuit 313 includes a capacitor C2, a capacitor C3, and a resistor R5. The signal modulation circuit 311, the resistor R5, the capacitor C2, and the first input terminal p 7 Which are in turn electrically connected. The capacitor C3 is connected between the resistor R5 and the capacitor C2, and the capacitor C3 is grounded.
In some embodiments, with continued reference to fig. 10, the matching circuit 30 further includes a first negative feedback circuit 39. The first negative feedback circuit 39 and the first input terminal p 7 The isolation module 33 is electrically connected. The first negative feedback circuit 39 is used for feeding back the electric signal input to the isolation module 33 to the first input terminal p 7 。
In some embodiments, the first negative feedback circuit 39 includes a resistor R6. The resistor R6, the resistor R5, and the capacitor C2 may form a negative feedback proportional amplifying circuit, and are configured to amplify the modulation signal generated by the signal modulating circuit 311.
In some embodiments, referring to fig. 11, fig. 11 is a schematic view of a second structure of a motor driving system 100 provided in the embodiments of the present application. The motor driving system 100 further includes a buffer circuit 50 and a Micro Control Unit (MCU) 60.
The snubber circuit 50 is electrically connected to the resolver 40, and a feedback signal output from the resolver 40 may be input to the snubber circuit 50. The buffer circuit 50 is configured to receive the feedback signal output by the rotary transformer 40, and process the feedback signal to obtain a processed feedback signal.
The microcontroller 60 is electrically connected to the buffer circuit 50, and the processed feedback signal obtained by the buffer circuit 50 can be input to the microcontroller 60. The microcontroller 60 is configured to receive the processed feedback signal input by the buffer circuit 50, and obtain an operation parameter of the motor according to the processed feedback signal. For example, the microcontroller 60 may be configured to analyze the processed feedback signal to obtain the operating parameters of the motor.
In some embodiments, referring to fig. 12, fig. 12 is a schematic structural diagram of a third structure of a motor driving system 100 provided in the embodiments of the present application.
The rotary transformer 40 includes an input end 40a, an input end 40b, a second output end 40c, and a third output end 40d. The input end 40a is electrically connected to the first output module 34. The input terminal 40b is electrically connected to the second output module 36. The second output terminal 40c and the third output terminal 40d are used for outputting the feedback signal.
The buffer circuit 50 includes a second operational amplifier 51. The second operational amplifier 51 comprises a third input p 10 A fourth input terminal p 11 And a fourth output terminal p 12 . The third input terminal p 10 And is electrically connected to the second output terminal 40 c. Said fourth input terminal p 11 And is electrically connected to the third output terminal 40d. The fourth input terminal p 11 And is also electrically connected to a power supply terminal VDD. The power supply terminal VDD is used for inputting a voltage.
The microcontroller 60 comprises a fifth input 60a and a sixth input 60b.
Wherein the fourth output terminal p 12 Is electrically connected to a fifth input 60a of said microcontroller 60. The sixth input 60b of the microcontroller 60 is electrically connected to the power supply terminal VDD.
It will be appreciated that in some embodiments, the third input terminal p 10 A resistor R7 may be further disposed between the second output terminal 40 c. Said fourth input terminal p 11 A resistor R8 may be further disposed between the third output terminal 40d and the fourth input terminal p 11 A resistor R9 may also be provided between the power supply terminal VDD. The fourth output terminal p 12 A resistor R10 may also be provided between the fifth input 60a of the microcontroller 60.
In some embodiments, with continued reference to fig. 12, the buffer circuit 50 further includes a second negative feedback circuit 52. The second negative feedback circuit 52 and the third input terminal p 10 The fourth output terminal p 12 And (6) electrically connecting. The second negative feedback circuit 52 is used for connecting the fourth output terminal p 12 The output electric signal is fed back to the third input end p 10 。
In some embodiments, the second negative feedback circuit 52 includes a resistor R11.
The matching circuit and the motor driving system of the resolver according to the embodiment of the present application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (9)
1. A matching circuit for a rotary transformer, comprising:
the first input module is used for providing a modulated excitation signal;
the power amplification module is electrically connected with the first input module and is used for receiving the modulated excitation signal input by the first input module and performing power amplification on the modulated excitation signal to obtain a power signal, wherein the power signal comprises an alternating current signal component and a direct current signal component;
when the first input module has a short-circuit fault, the power amplification module obtains the power signal with a short-circuit current;
the isolation module is electrically connected with the power amplification module and is used for receiving the power signal input by the power amplification module and isolating a direct current signal component in the power signal when short-circuit current appears in the power signal so as to obtain an alternating current signal component;
the first output module is electrically connected with the isolation module and is used for receiving the alternating current signal component input by the isolation module and outputting the alternating current signal component to a rotary transformer;
the current limiting module is electrically connected with the first input module and the power amplification module, and is used for limiting the magnitude of the current flowing through the power amplification module when the magnitude of the current flowing through the power amplification module reaches a preset current magnitude;
the balance resistance module is electrically connected with the power amplification module and the isolation module;
the power amplification module comprises a first transistor and a second transistor;
the first transistor comprises a first pin, a second pin and a third pin, the first pin is electrically connected with a power supply, the second pin is electrically connected with the first input module, and the third pin is electrically connected with the balance resistance module;
the second transistor comprises a fourth pin, a fifth pin and a sixth pin, the fourth pin is electrically connected with the balanced resistance module, the fifth pin is electrically connected with the first input module, and the sixth pin is grounded;
the current limiting module includes:
the anode of the first diode is electrically connected with the second pin, and the cathode of the first diode is connected between the balance resistance module and the isolation module;
the anode of the second diode is connected between the balance resistance module and the isolation module, and the cathode of the second diode is electrically connected with the fifth pin;
the balanced resistance module includes:
the first resistor is electrically connected with the third pin and the isolation module;
the second resistor is electrically connected with the fourth pin and the isolation module;
the isolation module comprises a capacitor;
one end of the capacitor is connected with the first resistor, the second resistor, the cathode of the first diode and the anode of the second diode, and the other end of the capacitor is connected with the first output module.
2. The matching circuit of a resolver according to claim 1, further comprising:
a second input module, the second input module being grounded;
and the second output module is electrically connected with the second input module, and the second output module and the first output module are used for outputting the alternating current signal component to the rotary transformer together.
3. The matching circuit of the resolver according to claim 1 or 2, wherein the first input module comprises:
a signal modulation circuit for generating a modulated signal;
the first operational amplifier comprises a first input end, a second input end and a first output end, wherein the first input end is electrically connected with the signal modulation circuit, the second input end is used for inputting reference voltage, the first output end is used for outputting the modulated excitation signal, and the modulated excitation signal is a signal obtained according to the modulation signal and the reference voltage.
4. The matching circuit of claim 3, wherein the modulated signal is a pulse width modulated signal, the first input module further comprising:
and the filter circuit is electrically connected with the signal modulation circuit and the first input end, and is used for filtering the pulse width modulation signal to generate a sinusoidal signal with direct current bias, and the first input end is used for inputting the sinusoidal signal with direct current bias.
5. The matching circuit of a resolver according to claim 4, further comprising:
the first negative feedback circuit is electrically connected with the first input end and the isolation module and is used for feeding back the electric signal input to the isolation module to the first input end.
6. A motor drive system, comprising:
an inverter for outputting a drive signal and a drive signal;
the motor is electrically connected with the inverter and is used for running under the driving of the driving signal;
a matching circuit of a rotary transformer, electrically connected to the inverter, the matching circuit of the rotary transformer being configured to process the excitation signal and output the processed excitation signal, the matching circuit of the rotary transformer being the matching circuit of the rotary transformer according to any one of claims 1 to 5;
and the rotary transformer is electrically connected with a matching circuit of the rotary transformer, and is used for outputting a feedback signal according to the processed excitation signal, and the feedback signal is used for acquiring the running parameters of the motor.
7. The motor drive system of claim 6, further comprising:
the buffer circuit is electrically connected with the rotary transformer and is used for processing the feedback signal to obtain a processed feedback signal;
and the microcontroller is electrically connected with the buffer circuit and used for obtaining the running parameters of the motor according to the processed feedback signal.
8. The motor drive system according to claim 7, wherein:
the rotary transformer comprises a second output end and a third output end, and the second output end and the third output end are used for outputting the feedback signal;
the buffer circuit comprises a second operational amplifier, the second operational amplifier comprises a third input end, a fourth input end and a fourth output end, the third input end is electrically connected with the second output end, the fourth input end is electrically connected with the third output end, the fourth output end is electrically connected with a fifth input end of the microcontroller, the fourth input end is also electrically connected with a power supply end, and a sixth input end of the microcontroller is electrically connected with the power supply end.
9. The motor drive system of claim 8, wherein the snubber circuit further comprises:
and the second negative feedback circuit is electrically connected with the third input end and the fourth output end, and is used for feeding back the electric signal output by the fourth output end to the third input end.
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| CN202010983251.1A CN112217180B (en) | 2020-09-18 | 2020-09-18 | Matching circuit of rotary transformer and motor driving system |
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| CN202010983251.1A CN112217180B (en) | 2020-09-18 | 2020-09-18 | Matching circuit of rotary transformer and motor driving system |
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| CN116015321B (en) * | 2023-01-03 | 2024-05-10 | 广东立勤电子有限公司 | Wireless communication rotary transformer |
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