CN114002493A - Neutral point voltage detection circuit of motor - Google Patents
Neutral point voltage detection circuit of motor Download PDFInfo
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- CN114002493A CN114002493A CN202111284571.9A CN202111284571A CN114002493A CN 114002493 A CN114002493 A CN 114002493A CN 202111284571 A CN202111284571 A CN 202111284571A CN 114002493 A CN114002493 A CN 114002493A
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Abstract
The application provides a neutral point voltage detection circuit of motor includes: a neutral point voltage built-in unit and a capacitance sampling transfer unit; the neutral point voltage built-in unit is used for constructing neutral point voltage of the motor according to the terminal voltage of three phases of the motor; the capacitance sampling transfer unit is used for controlling corresponding high-voltage switch units in the capacitance sampling transfer unit to be sequentially conducted in a non-overlapping mode according to the sampling signal and the holding signal, and outputting the neutral point voltage in a capacitance sampling transfer mode; the sampling signal and the holding signal respectively control the on-off of a corresponding high-voltage switch unit in the capacitance sampling transfer unit; that is, the neutral point voltage detection circuit of motor that this application provided can be with the mode that the electric capacity sampling shifted, will construct according to the terminal voltage of motor three-phase, and the neutral point voltage that obtains the motor carries out the output, has improved the detection precision of neutral point voltage, has solved the problem that the current neutral point voltage that obtains through resistance voltage division mode detection is low.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a neutral point voltage detection circuit of a motor.
Background
A three-phase Brushless Direct Current Motor (BLDCM), abbreviated as BLDC. It is necessary to detect a commutation point, that is, a zero-crossing point of the motor during commutation driving of the BLDC. To reduce the complexity, cost and number of chip interfaces of the system, a built-in neutral point detection method is generally used.
As shown in fig. 1, a conventional neutral point voltage detection circuit generally uses a resistance voltage division method to perform detection. However, since a load is generated due to the resistance voltage division, the neutral point voltage detected by using such a detection method is easily lowered.
Disclosure of Invention
Therefore, the application provides a neutral point voltage detection circuit of a motor, which aims to solve the problem that the existing neutral point voltage obtained through resistance voltage division detection is low.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the application discloses neutral point voltage detection circuit of motor includes: a neutral point voltage built-in unit and a capacitance sampling transfer unit; wherein:
the neutral point voltage built-in unit is used for constructing neutral point voltage of the motor according to the terminal voltage of the three phases of the motor;
the capacitance sampling transfer unit is used for controlling corresponding high-voltage switch units in the capacitance sampling transfer unit to be sequentially conducted in a non-overlapping mode according to the sampling signal and the holding signal, and outputting the neutral point voltage in a capacitance sampling transfer mode; the sampling signal and the holding signal respectively control the on-off of a corresponding high-voltage switch unit in the capacitance sampling transfer unit.
Optionally, in the neutral point voltage detection circuit of an electric motor described above, the capacitance sampling transfer unit includes: the circuit comprises a first high-voltage switch unit, a second high-voltage switch unit, a first control unit, a second control unit, a current bias unit, a first transfer unit and a second transfer unit; wherein:
the current bias unit is used for generating reference current according to a low-voltage power supply;
the first control unit is used for outputting a corresponding control signal according to the sampling signal, the high-voltage power supply and the reference current and controlling the first high-voltage switch unit to be switched on and off;
the first high-voltage switch unit is used for transferring the neutral point voltage to the first transfer unit when the first high-voltage switch unit is conducted;
the second control unit is used for outputting a corresponding control signal according to a holding signal, the high-voltage power supply and the reference current to control the second high-voltage switch tube to be switched on and off;
and the second high-voltage switch unit is used for transferring the neutral point voltage transferred to the first transfer unit to the second transfer unit again for output when the second high-voltage switch unit is conducted.
Optionally, in the neutral point voltage detection circuit of the electric motor, the first high voltage switch unit and the second high voltage switch unit have the same structure;
the first control unit and the second control unit have the same structure.
Optionally, in the neutral point voltage detection circuit of the electric machine, the neutral point voltage output in the manner of sampling and transferring the capacitance is less than or equal to a neutral point voltage constructed from terminal voltages of three phases of the electric machine.
Optionally, in the neutral point voltage detection circuit of an electric motor described above, the first high voltage switching unit includes: the first switch tube, the second switch tube, the fourth resistor and the first voltage stabilizing diode; wherein:
the control end of the first switch tube is respectively connected with one end of a fourth resistor, the cathode of the first voltage stabilizing diode and the control end of the second switch tube, and the connection point receives a first control signal output by the first control unit;
the first end of the first switch tube is respectively connected with the other end of the fourth resistor, the anode of the first voltage stabilizing diode and the first end of the second switch tube, and a connection point receives a second control signal output by the first control unit;
the second end of the first switch tube receives the neutral point voltage;
and the second end of the second switching tube is used as the output end of the first high-voltage switching unit.
Optionally, in the neutral point voltage detection circuit of the motor, the first switch tube and the second switch tube are both PMOS tubes with diodes.
Optionally, in the neutral point voltage detection circuit of an electric motor described above, the first control unit includes: the third switching tube, the fourth switching tube, the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube; wherein:
the first end of the third switch tube is connected with the first end of the fourth switch, and the connecting point is connected with the high-voltage power supply;
the second end of the third switching tube is connected with the control end of the third switching tube, the control end of the fourth switching tube and the second end of the fifth switching tube respectively;
the control end of the fifth switching tube receives the sampling signal, and the first end of the fifth switching tube is connected with the second end of the seventh switching tube;
the control end of the seventh switching tube is connected with the control end of the eighth switching tube, and a connection point receives the reference current;
the first end of the seventh switching tube and the first end of the eighth switching tube are grounded;
the second end of the eighth switching tube is connected with the first end of the sixth switching tube; the control end of the sixth switching tube receives the sampling signal;
a second end of the fourth switching tube is used as a first output end of the first control unit and outputs a first control signal of the first control unit;
and a second end of the sixth switching tube is used as a second output end of the first control unit and outputs a second control signal of the first control unit.
Optionally, in the neutral point voltage detection circuit of the motor, the third switching tube and the fourth switching tube are both PMOS tubes with diodes;
the fifth switching tube and the sixth switching tube are both NMOS tubes with diodes;
the seventh switch tube and the eighth switch tube are NMOS tubes without body diodes.
Optionally, in the neutral point voltage detection circuit of an electric motor described above, the first transfer unit includes: the first capacitor, the ninth switch tube and the twenty-second switch tube;
one end of the first capacitor and the second end of the twenty-second switching tube are respectively connected with the output end of the first high-voltage switching unit; the other end of the first capacitor is connected with the second end of the ninth switching tube;
the first end of the ninth switch tube and the first end of the twenty-second switch tube are both grounded;
the control end of the ninth switching tube receives the sampling delay signal;
the control end of the twenty-second switch tube receives the holding signal.
Optionally, in the neutral point voltage detection circuit of the motor, the ninth switching tube is an NMOS tube with a diode.
Optionally, in the neutral point voltage detection circuit of an electric motor described above, the second high voltage switching unit includes: a tenth switching tube, an eleventh switching tube, a fifth resistor and a second zener diode; wherein:
a control end of the tenth switching tube is connected with one end of the fifth resistor, a cathode of the second voltage regulator diode and a control end of the eleventh switching tube respectively, and a connection point receives a first control signal output by the second control unit;
a first end of the tenth switching tube is connected to one end of the fifth resistor, an anode of the second zener diode, and a first end of the eleventh switching tube, respectively, and a connection point receives a second control signal output by the second control unit;
a second end of the tenth switching tube receives the first shifted neutral point voltage;
and the second end of the eleventh switch tube is used as the output end of the second high-voltage switch unit.
Optionally, in the neutral point voltage detection circuit of the motor, the tenth switching tube and the eleventh switching tube are both PMOS tubes with diodes.
Optionally, in the neutral point voltage detection circuit of an electric motor described above, the second control unit includes: a twelfth switching tube, a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube and a seventeenth switching tube; wherein:
the first end of the twelfth switching tube is connected with the first end of the thirteenth switching tube, and the connecting point is connected with the high-voltage power supply;
a second end of the twelfth switching tube is connected with a control end of the twelfth switching tube, a control end of the thirteenth switching tube and a second end of the fourteenth switching tube respectively;
the control end of the fourteenth switching tube receives the holding signal, and the first end of the fourteenth switching tube is connected with the second end of the sixteenth switching tube;
the control end of the sixteenth switching tube is connected with the control end of the seventeenth switching tube, and a connection point receives the reference current;
the second end of the seventeenth switching tube is connected with the first end of the fifteenth switching tube; the control end of the fifteenth switching tube receives the sampling signal;
a second end of the thirteenth switching tube is used as a first output end of the second control unit and outputs a first control signal of the second control unit;
and a second end of the fifteenth switching tube is used as a second output end of the second control unit and outputs a second control signal of the second control unit.
Optionally, in the neutral point voltage detection circuit of the motor, the twelfth switching tube and the thirteenth switching tube are both PMOS tubes with diodes;
the fourteenth switching tube and the fifteenth switching tube are both NMOS tubes with diodes;
the sixteenth switching tube and the seventeenth switching tube are both NMOS tubes without body diodes.
Optionally, in the neutral point voltage detection circuit of an electric motor described above, the second transfer unit includes: the second capacitor, the eighteenth switching tube, the nineteenth switching tube, the twentieth switching tube and the operational amplifier; wherein:
the inverting input end of the operational amplifier is connected with the second end of the eighteenth switching tube, and the connecting point is connected with the output end of the second high-voltage switching unit; the non-inverting input end of the operational amplifier is grounded; the output end of the operational amplifier is connected with one end of the second capacitor, the first end of the nineteenth switch tube and the first end of the twentieth switch tube, and a connection point is used as the output end of the second transfer unit;
the control end of the eighteenth switching tube receives the holding signal; a first end of the eighteenth switching tube is connected with the other end of the second capacitor, a second end of the nineteenth switching tube and a second end of the twentieth switching tube respectively;
the control end of the nineteenth switch tube and the control end of the twentieth switch tube both receive the holding signal.
Optionally, in the neutral point voltage detection circuit of the electric motor, the eighteenth switching tube and the twentieth switching tube are both NMOS tubes without body diodes;
the nineteenth switch tube is a PMOS tube without a body diode.
Optionally, in the neutral point voltage detection circuit of an electric motor described above, the current bias unit includes: a sixth resistor and a twenty-first switching tube;
one end of the sixth resistor receives the low-voltage power supply, the other end of the sixth resistor is connected with the second end of the twenty-first switching tube and the control end of the twenty-second switching tube respectively, and a connection point is used as the output end of the current bias unit to output the reference current;
the first end of the twenty-first switching tube is grounded.
Optionally, in the neutral point voltage detection circuit of the motor, the twenty-first switching tube is an NMOS tube without a body diode.
Optionally, in the neutral point voltage detecting circuit of the electric motor, the neutral point voltage building-in unit includes: a first resistor, a second resistor and a third resistor; wherein:
one end of the first resistor, one end of the second resistor and one end of the third resistor respectively receive corresponding terminal voltages in three phases of the motor;
the other end of the first resistor, the other end of the second resistor and the other end of the third resistor are connected, and a connection point is used as an output end of the neutral point voltage built-in unit to output the neutral point voltage.
The invention provides a neutral point voltage detection circuit of a motor, comprising: a neutral point voltage built-in unit and a capacitance sampling transfer unit; the neutral point voltage built-in unit is used for constructing neutral point voltage of the motor according to the terminal voltage of three phases of the motor; the capacitance sampling transfer unit is used for controlling corresponding high-voltage switch units in the capacitance sampling transfer unit to be sequentially conducted in a non-overlapping mode according to the sampling signal and the holding signal, and outputting the neutral point voltage in a capacitance sampling transfer mode; the sampling signal and the holding signal respectively control the on-off of a corresponding high-voltage switch unit in the capacitance sampling transfer unit; that is, the neutral point voltage detection circuit of motor that this application provided can be with the mode that the electric capacity sampling shifted, will construct according to the terminal voltage of motor three-phase, and the neutral point voltage that obtains the motor carries out the output, has improved the detection precision of neutral point voltage, has solved the problem that the current neutral point voltage that obtains through resistance voltage division mode detection is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a neutral point voltage detection circuit of a conventional motor;
fig. 2 is a schematic diagram of a neutral point voltage detection circuit of an electric machine according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
The embodiment of the application provides a neutral point voltage detection circuit of motor to solve the problem that the existing neutral point voltage obtained through resistance voltage division detection is low.
Referring to fig. 2, the neutral point voltage detection circuit of the motor mainly includes: a neutral point voltage built-in unit 101 and a capacitance sampling transfer unit 102; wherein:
the neutral point voltage building-in unit 101 is used for building a neutral point voltage of the motor according to the terminal voltages of the three phases of the motor.
In practical applications, in conjunction with fig. 2, the neutral voltage building-in unit 101 may include the following devices: a first resistor R1, a second resistor R2, and a third resistor R3.
One end of the first resistor R1, one end of the second resistor R2 and one end of the third resistor R3 respectively receive corresponding terminal voltages in three phases of the motor.
The other end of the first resistor R1, the other end of the second resistor R2, and the other end of the third resistor R3 are connected, and the connection point serves as an output terminal of the neutral point voltage building-in unit 101 to output a neutral point voltage (VSTAR in the figure).
Specifically, the first resistor R1 receives a corresponding terminal voltage of the three phases of the motor as OUT1, the second resistor R2 receives a corresponding terminal voltage of the three phases of the motor as OUT2, and the third resistor R3 receives a corresponding terminal voltage of the three phases of the motor as OUT 3.
It should be noted that the terminal voltages of three phases in the motor respectively represent the terminal voltages of each corresponding phase in the three-phase motor.
The capacitance sampling transfer unit 102 is configured to control corresponding high-voltage switch units in the capacitance sampling transfer unit to be sequentially non-overlapped and conducted according to the sampling signal and the holding signal, and output the neutral point voltage in a capacitance sampling transfer manner.
The sampling signal and the holding signal respectively control the on/off of the corresponding high-voltage switch unit in the capacitance sampling transfer unit 102.
The neutral point voltage output by the capacitance sampling transfer may be equal to or less than a neutral point voltage constructed from the terminal voltages of the three phases of the motor.
In practical applications, as also shown in fig. 2, the capacitive sampling transfer unit 102 may include: a first high voltage switch unit 201, a second high voltage switch unit 202, a first control unit 203, a second control unit 204, a current bias unit 205, a first transfer unit 206, and a second transfer unit 207. Wherein:
the current bias unit 205 is used for generating a reference current according to a low voltage power supply.
Specifically, referring also to fig. 2, the current bias unit 205 may include: a sixth resistor R4 and a twenty-first switching tube MN 1.
One end of the sixth resistor R4 receives a low voltage power supply (VDDA in the figure), the other end of the sixth resistor R4 is connected to the second end of the twenty-first switch transistor MN1 and the control end of the twenty-second switch transistor MN1, respectively, and the connection point is used as the output end of the current bias unit 205 to output the reference current.
The first terminal of the twenty-first switching tube MN1 is grounded (GND in the figure).
In practical applications, the twenty-first switching transistor NM1 is an NMOS transistor without a body diode.
The first control unit 203 is configured to output a corresponding control signal according to the sampling signal, the high-voltage power supply, and the reference current, and control the first high-voltage switch unit 201 to be turned on or off.
Specifically, referring also to fig. 2, the first control unit 203 may include: a third switching tube MP1, a fourth switching tube MP4, a fifth switching tube M1, a sixth switching tube M2, a seventh switching tube MN2 and an eighth switching tube MN 3. Wherein:
the first terminal of the third switch MP1 is connected to the first terminal of the fourth switch MP4, and the connection point is connected to the high voltage power supply (VBAT in the figure).
The second end of the third switch tube MP1 is connected to the control end of the third switch tube MP1, the control end of the fourth switch tube MP2 and the second end of the fifth switch tube M1, respectively.
The control terminal of the fifth switch transistor M1 receives the sampling signal (sample in the figure), and the first terminal of the fifth switch transistor M1M1 is connected to the second terminal of the seventh switch transistor MN 2.
The control end of the seventh switching tube MN2 is connected with the control end of the eighth switching tube MN3, and the connection point receives the reference current.
A first end of the seventh switching tube NM2 and a first end of the eighth switching tube NM3 are grounded (GND in the drawing).
A second end of the eighth switching tube NM3 is connected to a first end of the sixth switching tube M2; the control terminal of the sixth switching tube M2 receives the sampling signal (sample in the figure).
A second end of the fourth switch MP2 is used as a first output end of the first control unit 203, and outputs a first control signal of the first control unit 203.
A second end of the sixth switching tube M2 is used as a second output end of the first control unit 203, and outputs a second control signal of the first control unit 203.
In practical application, the third switching tube MP1 and the fourth switching tube MP2 are both PMOS tubes with diodes. The fifth switch tube M1 and the sixth switch tube M2 are NMOS tubes with diodes. The seventh switch NM2 and the eighth switch NM3 are NMOS transistors without a body diode.
When the sampling signal is active, i.e. at a high level, the third switching tube MP1, the fourth switching tube MP2, the fifth switching tube M1, the sixth switching tube M2, the seventh switching tube NM2 and the eighth switching tube NM3 are all turned on. When the sampling signal is invalid, i.e. at a low level, the third switching tube MP1, the fourth switching tube MP2, the fifth switching tube M1, the sixth switching tube M2, the seventh switching tube MN2, and the eighth switching tube NM3 are all turned off.
The first high voltage switching unit 201 is used to transfer the neutral point voltage to the first transfer unit 206 when it is turned on.
Specifically, referring also to fig. 2, the first high voltage switching unit 201 may include: the switch comprises a first switch tube MP5, a second switch tube MP6, a fourth resistor R5 and a first voltage stabilizing diode Z1. Wherein:
a control end of the first switch tube MP5 is respectively connected to one end of the fourth resistor R5, a cathode of the first zener diode Z1, and a control end of the second switch tube MP6, and a connection point receives the first control signal output by the first control unit 203.
A first end of the first switch tube MP5 is connected to the other end of the fourth resistor R5, the anode of the first zener diode Z1, and a first end of the second switch tube MP6, respectively, and a connection point receives the second control signal output by the first control unit 203.
The second terminal of the first switching tube MP5 receives the neutral point voltage.
A second terminal of the second switch MP6 is used as an output terminal of the first high-voltage switch unit 201.
In practical applications, the first switch MP5 and the second switch MP6 are both PMOS transistors with diodes.
It should be noted that when the first control unit 203 outputs the first control signal and the second control signal to generate a voltage, a current flows through the fourth resistor R5, and a voltage drop is generated across the first switch tube MP5 and the second switch tube MP6 and is turned on. If the first control unit 203 outputs the first control signal and the second control signal and generates a voltage, no current flows through the fourth resistor R5, the first switch tube MP5 and the second switch tube MP6 do not generate a voltage drop, and the first switch tube MP5 and the second switch tube MP6 are turned off.
Specifically, referring also to fig. 2, the first transfer unit 206 may include: a first capacitor C1, a ninth switch M3, and a twenty-second switch M6.
One end of the first capacitor C1 and the second end of the second switch tube M6 are respectively connected to the output end of the first high-voltage switch unit 201; the other end of the first capacitor C1 is connected to the second end of the ninth switch tube M3.
The first end of the ninth switch tube M3 and the first end of the twenty-second switch tube M6 are both grounded (GND in the figure).
The control terminal of the ninth switching tube M3 receives the sampling delay signal (sample _ delay in the figure).
The control terminal of the twenty-second switching tube M6 receives the hold signal (hold in the figure).
In practical applications, the sampling delay signal is a sampling signal whose action is delayed from the sampling signal by a predetermined time. The preset time of the delay action may be determined according to a specific application environment and a user requirement, for example, 0.5s, 0.05s, and the like, and the present application is not particularly limited and all fall within the protection scope of the present application.
It should be noted that the ninth switch tube M3 and the twenty-second switch tube M6 may be NMOS tubes with diodes.
The second control unit 204 is configured to output a corresponding control signal according to the hold signal, the high-voltage power supply, and the reference current, and control on/off of the second high-voltage switch tube.
Specifically, referring also to fig. 2, the second control unit 204 mainly includes: a twelfth switching tube MP3, a thirteenth switching tube MP4, a fourteenth switching tube M4, a fifteenth switching tube M5, a sixteenth switching tube NM4 and a seventeenth switching tube NM 5. Wherein:
a first end of the twelfth switch MP3 is connected to a first end of the thirteenth switch M4, and the connection point is connected to the high voltage power supply (VBAT in the figure).
A second end of the twelfth switch tube MP3 is respectively connected to the control end of the twelfth switch tube MP3, the control end of the thirteenth switch tube MP4 and the second end of the fourteenth switch tube M4.
The control end of the fourteenth switching tube M4 receives the hold signal (hold in the figure), and the first end of the fourteenth switching tube M4 is connected to the second end of the sixteenth switching tube MN 4.
The control end of the sixteenth switching tube MN4NM5 is connected to the control end of the seventeenth switching tube, and the connection point receives the reference current.
A second end of the seventeenth switching tube MN5 is connected to a first end of the fifteenth switching tube NM 5; the control terminal of the fifteenth switching tube NM5 receives a hold signal (hold in the drawing).
A second end of the thirteenth switch MP4 is used as a first output end of the second control unit 204, and outputs the first control signal of the second control unit 204.
A second end of the fifteenth switching tube M5 serves as a second output end of the second control unit 204, and outputs a second control signal of the second control unit 204.
In practical applications, the twelfth switching tube MP3 and the thirteenth switching tube MP4 are both PMOS tubes with diodes. The fourteenth switching tube M4 and the fifteenth switching tube M5 are both NMOS tubes with diodes. The sixteenth switching tube MN4 and the seventeenth switching tube NM5 are NMOS tubes without body diodes.
It should be noted that, because the second high-voltage switch unit 202 and the first high-voltage switch unit 201 have the same structure, it can be understood that, when the sampling signal is valid, i.e. at a high level, the twelfth switch tube MP3, the thirteenth switch tube MP4, the fourteenth switch tube M4, the fifteenth switch tube M5, the sixteenth switch tube NM4 and the seventeenth switch tube NM5 are all turned on; when the sampling signal is inactive, i.e. low level, the twelfth switching tube MP3, the thirteenth switching tube MP4, the fourteenth switching tube M4, the fifteenth switching tube M5, the sixteenth switching tube NM4 and the seventeenth switching tube NM5 are all turned off.
The second high voltage switch unit 202 is used for transferring the neutral point voltage transferred to the first transfer unit 206 to the second transfer unit 207 again for output when the second high voltage switch unit is turned on.
Specifically, referring to fig. 2, the second high-voltage switch unit 202 mainly includes: a tenth switching tube MP7, an eleventh switching tube MP8, a fifth resistor R6 and a second zener diode Z2. Wherein:
a control end of the tenth switching tube MP7 is respectively connected to one end of the fifth resistor R6, a cathode of the second zener diode Z2, and a control end of the eleventh switching tube MP8, and a connection point receives the first control signal output by the second control unit 204.
A first end of the tenth switching tube MP7 is respectively connected to one end of the fifth resistor R6, the anode of the second zener diode Z2, and a first end of the eleventh switching tube MP8, and a connection point receives the second control signal output by the second control unit 204.
A second terminal of the tenth switching tube MP7 receives the first shifted neutral point voltage.
A second terminal of the eleventh switch MP8 is used as the output terminal of the second high-voltage switch unit 202.
In practical applications, the tenth switching tube MP7 and the eleventh switching tube MP8 are both PMOS tubes with diodes.
It should be noted that, since the second control unit 204 and the first control unit 203 have the same structure, it can be understood that when the second control unit 204 outputs the first control signal and the second control signal to generate a voltage, a current flows through the fifth resistor R6, and a voltage drop is generated across the tenth switch MP7 and the eleventh switch MP8 and is turned on. If the second control unit 204 outputs the first control signal and the second control signal and the upper voltage is generated, no current flows through the fifth resistor R6, the tenth switching tube MP7 and the eleventh switching tube MP8 do not generate a voltage drop, and the tenth switching tube MP7 and the eleventh switching tube MP8 are turned off.
Specifically, also in conjunction with fig. 2, the second transfer unit 207 may include: a second capacitor C2, an eighteenth switching tube MN6, a nineteenth switching tube P1, a twentieth switching tube MN7 and an operational amplifier AMP 1. Wherein:
the inverting input end of the operational amplifier AMP1 is connected with the second end of the eighteenth switching tube MN6, and the connecting point is connected with the output end of the second high-voltage switching unit 202; the non-inverting input terminal + of the operational amplifier AMP1 is grounded (GND in the figure); an output terminal of the operational amplifier AMP1 is connected to one terminal of the second capacitor C2, a first terminal of the nineteenth switch P1, and a first terminal of the twentieth switch MN7, and the connection point serves as an output terminal of the second transfer unit 207.
The control end of the eighteenth switching tube MN6 receives a hold signal (hold in the figure); a first terminal of the eighteenth switching tube MN6 is connected to the other terminal of the second capacitor C2, the second terminal of the nineteenth switching tube P1, and the second terminal of the twentieth switching tube MN7, respectively.
The control end of the nineteenth switch tube P1 and the control end of the twentieth switch tube MN7 both receive the sampling signal. Wherein, the sampling signal received by the control end of the nineteenth switching tube P1 is sample _ n in the figure; the control end of the twentieth switch tube MN7 receives a sampling signal, which is sample in the figure.
In practical application, the eighteenth switching tube MN6 and the twentieth switching tube MN7 are both NMOS tubes without body diodes; the nineteenth switching tube P1 is a PMOS tube without a body diode.
It should be noted that the eighteenth switching tube MN6 is turned on and off by the hold signal, and the twentieth switching tube MN7 is turned on and off by the sampling signal. Since the holding signal and the sampling signal are non-overlapping signals, when the holding signal is at a low level, the sampling signal is at a high level, the eighteenth switch MN6 is turned off, the twentieth switch MN7 is turned on, and the second capacitor C2 starts to discharge.
In combination with the above, in the practical application process, the working state of the neutral point voltage detection circuit of the motor can be divided into a sampling state and a holding state.
Sampling state: the first high voltage switch unit 201 is turned on, the neutral point voltage is sampled to the first capacitor C1, and the sampling delay signal sample _ delay received by the ninth switch tube M3 controls the ninth switch tube M3 to turn off at the end of sampling, so as to prevent the charge injection of the first capacitor C1. The second high voltage switch unit 202 is turned off and the charge of the second capacitor C2 is discharged to zero.
A holding state: the second high voltage switch unit 202 is turned on, the twenty-second switch tube M6 is in a conducting state, the voltage on the first capacitor C1 is transferred to the second capacitor C2, one end of the operational amplifier AMP1 is grounded (GND in the figure), the voltage across the first capacitor C1 is zero after the transfer is completed according to the virtual short of the operational amplifier AMP1, the voltage across one end of the second capacitor C2 is 0, and the other end is the neutral point voltage outputted in a manner of capacitor sampling transfer.
In practical applications, by setting the ratio of the first capacitor C1 to the second capacitor C2, for example, setting the ratio of the first capacitor C1 to the second capacitor C2 to N:1, the voltage generated on the second capacitor C2 can be equal to 1/N of the first capacitor C1, and thus, the neutral point voltage can be sampled from the high-voltage side to the low-voltage side.
It should be noted that the sampling signal and the holding signal may be clock signals that do not overlap with each other, so as to prevent power from being passed through.
Based on the above principle, the present embodiment provides a neutral point voltage detection circuit for an electric motor, including: a neutral point voltage built-in unit 101 and a capacitance sampling transfer unit 102; the neutral point voltage building-in unit 101 is used for building a neutral point voltage of the motor according to the terminal voltages of three phases of the motor; the capacitance sampling transfer unit 102 is used for controlling corresponding high-voltage switch units in the capacitance sampling transfer unit to be sequentially conducted in a non-overlapping mode according to the sampling signal and the holding signal, and outputting the neutral point voltage in a capacitance sampling transfer mode; the sampling signal and the holding signal respectively control the on-off of the corresponding high-voltage switch unit in the capacitance sampling transfer unit 102; that is, the neutral point voltage detection circuit of motor that this application provided can be with the mode that the electric capacity sampling shifted, will construct according to the terminal voltage of motor three-phase, and the neutral point voltage that obtains the motor carries out the output, has improved the detection precision of neutral point voltage, has solved the problem that the current neutral point voltage that obtains through resistance voltage division mode detection is low.
In addition, the ratio of corresponding capacitors in a neutral point voltage detection circuit of the motor can be set, so that the neutral point voltage can be sampled from a high-voltage side to a low-voltage side.
It should be noted that the first end of the switching tube in this embodiment represents a source, i.e., an end with an arrow in the drawing; the second end of the switch tube represents a drain electrode, namely the end without an arrow in the figure; the control end of the switch tube represents a grid electrode.
Features described in the embodiments in the present specification may be replaced with or combined with each other, and the same and similar portions among the embodiments may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (19)
1. A neutral point voltage detecting circuit of an electric motor, comprising: a neutral point voltage built-in unit and a capacitance sampling transfer unit; wherein:
the neutral point voltage built-in unit is used for constructing neutral point voltage of the motor according to the terminal voltage of the three phases of the motor;
the capacitance sampling transfer unit is used for controlling corresponding high-voltage switch units in the capacitance sampling transfer unit to be sequentially conducted in a non-overlapping mode according to the sampling signal and the holding signal, and outputting the neutral point voltage in a capacitance sampling transfer mode; the sampling signal and the holding signal respectively control the on-off of a corresponding high-voltage switch unit in the capacitance sampling transfer unit.
2. The neutral point voltage detecting circuit of an electric motor according to claim 1, wherein the capacitance sample transfer unit includes: the circuit comprises a first high-voltage switch unit, a second high-voltage switch unit, a first control unit, a second control unit, a current bias unit, a first transfer unit and a second transfer unit; wherein:
the current bias unit is used for generating reference current according to a low-voltage power supply;
the first control unit is used for outputting a corresponding control signal according to the sampling signal, the high-voltage power supply and the reference current and controlling the first high-voltage switch unit to be switched on and off;
the first high-voltage switch unit is used for transferring the neutral point voltage to the first transfer unit when the first high-voltage switch unit is conducted;
the second control unit is used for outputting a corresponding control signal according to a holding signal, the high-voltage power supply and the reference current to control the second high-voltage switch tube to be switched on and off;
and the second high-voltage switch unit is used for transferring the neutral point voltage transferred to the first transfer unit to the second transfer unit again for output when the second high-voltage switch unit is conducted.
3. The neutral point voltage detecting circuit of an electric motor according to claim 2, wherein the first high voltage switching unit and the second high voltage switching unit are identical in structure;
the first control unit and the second control unit have the same structure.
4. The neutral point voltage detection circuit of an electric machine according to claim 2, wherein the neutral point voltage outputted in the manner of the capacitive sampling transfer is equal to or less than a neutral point voltage constructed from terminal voltages of three phases of the electric machine.
5. The neutral point voltage detecting circuit of an electric motor according to claim 2, wherein the first high voltage switching unit includes: the first switch tube, the second switch tube, the fourth resistor and the first voltage stabilizing diode; wherein:
the control end of the first switch tube is respectively connected with one end of a fourth resistor, the cathode of the first voltage stabilizing diode and the control end of the second switch tube, and the connection point receives a first control signal output by the first control unit;
the first end of the first switch tube is respectively connected with the other end of the fourth resistor, the anode of the first voltage stabilizing diode and the first end of the second switch tube, and a connection point receives a second control signal output by the first control unit;
the second end of the first switch tube receives the neutral point voltage;
and the second end of the second switching tube is used as the output end of the first high-voltage switching unit.
6. The neutral point voltage detecting circuit of an electric motor according to claim 5, wherein the first switching tube and the second switching tube are both PMOS tubes with diodes.
7. The neutral point voltage detecting circuit of an electric motor according to claim 2, wherein the first control unit includes: the third switching tube, the fourth switching tube, the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube; wherein:
the first end of the third switch tube is connected with the first end of the fourth switch, and the connecting point is connected with the high-voltage power supply;
the second end of the third switching tube is connected with the control end of the third switching tube, the control end of the fourth switching tube and the second end of the fifth switching tube respectively;
the control end of the fifth switching tube receives the sampling signal, and the first end of the fifth switching tube is connected with the second end of the seventh switching tube;
the control end of the seventh switching tube is connected with the control end of the eighth switching tube, and a connection point receives the reference current;
the first end of the seventh switching tube and the first end of the eighth switching tube are grounded;
the second end of the eighth switching tube is connected with the first end of the sixth switching tube; the control end of the sixth switching tube receives the sampling signal;
a second end of the fourth switching tube is used as a first output end of the first control unit and outputs a first control signal of the first control unit;
and a second end of the sixth switching tube is used as a second output end of the first control unit and outputs a second control signal of the first control unit.
8. The neutral point voltage detecting circuit of an electric motor according to claim 7, wherein the third switching tube and the fourth switching tube are both PMOS tubes with diodes;
the fifth switching tube and the sixth switching tube are both NMOS tubes with diodes;
the seventh switch tube and the eighth switch tube are NMOS tubes without body diodes.
9. The neutral point voltage detecting circuit of an electric motor according to claim 2, wherein the first transfer unit includes: the first capacitor, the ninth switch tube and the twenty-second switch tube;
one end of the first capacitor and the second end of the twenty-second switching tube are respectively connected with the output end of the first high-voltage switching unit; the other end of the first capacitor is connected with the second end of the ninth switching tube;
the first end of the ninth switch tube and the first end of the twenty-second switch tube are both grounded;
the control end of the ninth switching tube receives the sampling delay signal;
the control end of the twenty-second switch tube receives the holding signal.
10. The neutral point voltage detecting circuit of an electric motor according to claim 9, wherein the ninth switching tube and the twenty-second switching tube are NMOS tubes with diodes.
11. The neutral point voltage detecting circuit of an electric motor according to claim 2, wherein the second high voltage switching unit includes: a tenth switching tube, an eleventh switching tube, a fifth resistor and a second zener diode; wherein:
a control end of the tenth switching tube is connected with one end of the fifth resistor, a cathode of the second voltage regulator diode and a control end of the eleventh switching tube respectively, and a connection point receives a first control signal output by the second control unit;
a first end of the tenth switching tube is connected to one end of the fifth resistor, an anode of the second zener diode, and a first end of the eleventh switching tube, respectively, and a connection point receives a second control signal output by the second control unit;
a second end of the tenth switching tube receives the first shifted neutral point voltage;
and the second end of the eleventh switch tube is used as the output end of the second high-voltage switch unit.
12. The neutral point voltage detecting circuit of an electric motor according to claim 11, wherein the tenth switching tube and the eleventh switching tube are both PMOS tubes with body diodes.
13. The neutral point voltage detecting circuit of an electric motor according to claim 2, wherein the second control unit includes: a twelfth switching tube, a thirteenth switching tube, a fourteenth switching tube, a fifteenth switching tube, a sixteenth switching tube and a seventeenth switching tube; wherein:
the first end of the twelfth switching tube is connected with the first end of the thirteenth switching tube, and the connecting point is connected with the high-voltage power supply;
a second end of the twelfth switching tube is connected with a control end of the twelfth switching tube, a control end of the thirteenth switching tube and a second end of the fourteenth switching tube respectively;
the control end of the fourteenth switching tube receives the holding signal, and the first end of the fourteenth switching tube is connected with the second end of the sixteenth switching tube;
the control end of the sixteenth switching tube is connected with the control end of the seventeenth switching tube, and a connection point receives the reference current;
the second end of the seventeenth switching tube is connected with the first end of the fifteenth switching tube; the control end of the fifteenth switching tube receives the sampling signal;
a second end of the thirteenth switching tube is used as a first output end of the second control unit and outputs a first control signal of the second control unit;
and a second end of the fifteenth switching tube is used as a second output end of the second control unit and outputs a second control signal of the second control unit.
14. The neutral point voltage detecting circuit of an electric motor according to claim 13, wherein the twelfth switching tube and the thirteenth switching tube are both PMOS tubes with diodes;
the fourteenth switching tube and the fifteenth switching tube are both NMOS tubes with diodes;
the sixteenth switching tube and the seventeenth switching tube are both NMOS tubes without body diodes.
15. The neutral point voltage detecting circuit of an electric motor according to claim 2, wherein the second transfer unit includes: the second capacitor, the eighteenth switching tube, the nineteenth switching tube, the twentieth switching tube and the operational amplifier; wherein:
the inverting input end of the operational amplifier is connected with the second end of the eighteenth switching tube, and the connecting point is connected with the output end of the second high-voltage switching unit; the non-inverting input end of the operational amplifier is grounded; the output end of the operational amplifier is connected with one end of the second capacitor, the first end of the nineteenth switch tube and the first end of the twentieth switch tube, and a connection point is used as the output end of the second transfer unit;
the control end of the eighteenth switching tube receives the holding signal; a first end of the eighteenth switching tube is connected with the other end of the second capacitor, a second end of the nineteenth switching tube and a second end of the twentieth switching tube respectively;
the control end of the nineteenth switch tube and the control end of the twentieth switch tube both receive the holding signal.
16. The neutral point voltage detecting circuit of an electric motor according to claim 15, wherein said eighteenth switching tube and said twentieth switching tube are NMOS tubes without body diodes;
the nineteenth switch tube is a PMOS tube without a body diode.
17. The neutral point voltage detecting circuit of an electric motor according to claim 2, wherein the current bias unit includes: a sixth resistor and a twenty-first switching tube;
one end of the sixth resistor receives the low-voltage power supply, the other end of the sixth resistor is connected with the second end of the twenty-first switching tube and the control end of the twenty-second switching tube respectively, and a connection point is used as the output end of the current bias unit to output the reference current;
the first end of the twenty-first switching tube is grounded.
18. The neutral point voltage detecting circuit of an electric motor of claim 17, wherein the twenty-first switching tube is an NMOS tube without a body diode.
19. The neutral point voltage detecting circuit of an electric motor according to any one of claims 1 to 18, wherein the neutral point voltage building-in unit includes: a first resistor, a second resistor and a third resistor; wherein:
one end of the first resistor, one end of the second resistor and one end of the third resistor respectively receive corresponding terminal voltages in three phases of the motor;
the other end of the first resistor, the other end of the second resistor and the other end of the third resistor are connected, and a connection point is used as an output end of the neutral point voltage built-in unit to output the neutral point voltage.
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