CN114982124A - Power supply control circuit with shunt resistor for synchronous motor - Google Patents
Power supply control circuit with shunt resistor for synchronous motor Download PDFInfo
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- CN114982124A CN114982124A CN202180010584.9A CN202180010584A CN114982124A CN 114982124 A CN114982124 A CN 114982124A CN 202180010584 A CN202180010584 A CN 202180010584A CN 114982124 A CN114982124 A CN 114982124A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/28—Arrangements for controlling current
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Abstract
A power control circuit (300) for a synchronous machine (130) having three machine phase currents, the power control circuit (300) comprising a microcontroller (310) generating a PWM signal having a period (T) and a duty cycle (T) x 、T y 、T z And T w Said power supply control circuit (300) being characterized in that it comprises a shunt resistor (215) R shunt For calculating the DC current consumption (105) I S 。
Description
Technical Field
The present invention relates to a power control circuit for a synchronous motor having a controller that calculates the DC current consumption of the synchronous motor using one or more shunt resistors.
Background
Synchronous motors, both brushless dc (bldc) motors and Permanent Magnet Synchronous Motors (PMSM), are composed of a rotating permanent magnet (i.e., the rotor) surrounded by three fixed, equidistant windings (i.e., the stator). The current in each winding produces a magnetic field vector that is summed with the magnetic fields from the other windings. By controlling the currents in the three windings, the stator is able to generate a magnetic field of arbitrary direction and magnitude.
BLDC motors are becoming increasingly popular in the fields of automobiles, particularly Electric Vehicles (EV), heating, ventilation and air conditioning (HVAC), large household appliances and industrial products, etc., because it eliminates the mechanical brushes used in conventional motors. This feature makes the BLDC motor more reliable and extends its life.
Another advantage of the BLDC motor is that it can be made smaller and lighter than a brush motor having the same power output, which makes the BLDC motor suitable for use in applications where space is small.
The microcontroller of the control circuit of the synchronous motor may be configured to energize the stator coils of the motor at the correct time by executing a control algorithm. The precise timing allows for precise speed and torque control and ensures that the motor operates at maximum efficiency. In this regard, the microcontroller may receive a system current value as an input and a signal from a position sensor (e.g., a hall sensor indicating the position of the motor rotor) to implement the control algorithm.
The current value can be measured and used as input to a microcontroller-implemented control algorithm: the precise motor control performed by the control circuit of the synchronous motor represents a very important condition for the correct performance of the motor. Whether it be an electric power steering, electronic stability control, automatic braking system, or an autonomous vehicle, precise motor control may be required to ensure safe and efficient operation. Thus, the current can be measured to gather mainly information about the motor torque, since the current measurement can be directly proportional to the motor torque.
The current measurements can also be used to determine the speed at which the motor is rotating. Such speed information can be calculated by knowing how the control algorithm affects the current level applied in the synchronous machine. In this regard, a measured value of the phase motor current may be required as an input variable to a control algorithm implemented by the microcontroller. Thus, accurate measurement of phase motor currents can improve motor control solutions.
Furthermore, the current can be measured for fault protection: the current measurement can be used to detect when an over-current condition occurs, thereby enabling the system to take steps to prevent potential damage to the synchronous machine.
In a first example of the prior art, a current brushless DC motor control circuit may include 1 to 3 shunt resistors to measure the phase current that can be used as input to a control algorithm implemented by a microcontroller. Some algorithms may require DC current consumption I S The measurement of (2). To measure the current I S As shown in fig. 1, additional shunts (101, 102) can be included in the positive battery input (a) or battery loop (B) (i.e., in the DC link), which represents a conventional power supply control circuit (100) for a BLDC motor. However, the type of shunt resistor (101, 102) implies additional undesirable power dissipation and heat dissipation in the system.
Furthermore, the power control circuit (100) of fig. 1 can include an input AC filter (103) of a DC source (105), in particular an LC filter, a microcontroller/PWM block (110) representing a Pulse Width Modulation (PWM) generator that generates PWM signals to a three-phase inverter (120), and a microcontroller implementing a control algorithm that controls the input current in the synchronous machine (130). The three-phase inverter (120) comprises six switches for high power switching to feed current to the synchronous machine (130). Thus, the output of block (110) includes a Pulse Width Modulation (PWM) signal that determines the average voltage and average current applied to the three coils of the BLDC motor (which has a "Y" shape as shown in fig. 1) in order to control the motor speed and motor torque. Further, the synchronous machine (130) may use three hall effect sensors, not shown in the figures, to indicate rotor position. The rotor itself uses pairs of permanent magnets to generate magnetic flux.
In a second example of the prior art, fig. 2 shows that the calculation of the DC current consumption I was previously included S The device comprising signal processing means to obtain the DC current consumption I of the synchronous motor (130) is provided in the control circuit (200) S . In the present example, as shown, the DC current consumption I S Can be used as an input to the microcontroller/PWM module (210). These signal processing elements include means for amplifying the voltage V shunt And an amplifier (405) for performing offset correction and a filter for filtering a voltage signal V from the amplifier (405) shunt The low pass filter (410). Thus, the output voltage V is obtained from the low-pass filter (410) O And based on said voltage V O Obtaining DC current consumption I of BLDC motor S As shown in fig. 2.
Therefore, the power supply control circuit for a synchronous motor uses a program to measure the input DC current consumption I S Rather than using shunt resistors or additional electronic components (e.g., amplifiers, low pass filters, etc.) in the DC link, there is a need to reduce the cost and size of the electronic board.
Disclosure of Invention
The invention provides a device capable of measuring DC current consumption I of a motor S The synchronous motor (e.g., BLDC or PMSM motor) power control circuit of (1) eliminates the need to build a shunt resistor in the DC link of the power supply as compared to fig. 1 and eliminates the need for additional electronic components (amplifiers, low pass filters, etc.) as compared to fig. 2, thereby reducing the cost and size of the electronic board.
The power supply control circuit according to the invention thus allows calculating the power supply input current, i.e. the DC current consumption I of a control circuit such as a three-phase brushless DC (bldc) motor or a Permanent Magnet Synchronous Motor (PMSM) S . This calculation can be done entirely by code or software running in the microcontroller of the power inverter driving the power supply control circuit.
The present invention proposes an improved software algorithm for use in a microcontroller without the addition of any additional electronic components. Required for running the proposed software algorithmThe computational resources of (2) are small. DC Current consumption I calculated Using software Algorithm S Is comparable to the hardware solution of fig. 2.
The power control circuit according to the invention supports a single shunt topology in which only one shunt resistor as shown in fig. 3 is used.
Thus, in a first aspect, to measure the DC current consumption I of the motor S A power supply control circuit for a synchronous machine, for example a three-phase brushless DC machine, i.e. a BLDC machine or a permanent magnet synchronous machine PMSM, is proposed, which comprises a circuit for generating a voltage having a period T and a duty cycle T x 、T y 、T z And T w The power supply control circuit includes a microcontroller for calculating the DC current consumption I S Shunt resistor R shunt Wherein the microcontroller is configured to obtain a crossing of a shunt resistor R during T shunt First current measurement I of the electric machine 1 Obtaining a current through the shunt resistor R during T Shunt Second current measurement I of the electric machine 2 And is obtained across resistor R during T period of the PWM signal Shunt Average value of current of
Finally, the power control circuit is configured to average the values
Low-pass filtering to obtain DC current consumption I S 。
The power control circuit according to the invention also supports a three-shunt topology comprising three shunt resistors, one for each motor phase, as shown in fig. 9.
Therefore, in the second aspect of the present invention, in order to measure the DC current consumption I of the motor S It is proposed to use in a synchronous generatorPower supply control circuit for a machine, such as a three-phase brushless DC motor (i.e. BLDC motor) or a PMSM (permanent magnet synchronous Motor) having a motor phase current I A 、I B And I C The power supply control circuit comprises a generating period T and a duty ratio T x 、T y 、T z And T w A microcontroller of the PWM signal of (1). The power supply control circuit comprises a circuit for calculating DC current consumption I S Three shunt resistors R Sh1 、R Sh2 And R Sh3 . The microcontroller is configured to obtain a crossing of the shunt resistor R during T-0 or T/2 Sh1 Phase current measurement value I of a synchronous machine shunt1 Wherein, I shunt1 ＝I A (ii) a Obtaining a current through the shunt resistor R during T-0 or T/2 Sh2 Phase current measurement value I of a synchronous machine shunt2 Wherein, I shunt2 ＝I B (ii) a Obtaining a current through the shunt resistor R during T-0 or T/2 Sh3 Phase current measurement value I of a synchronous machine shunt3 Wherein, I shunt3 ＝I C (ii) a When having the maximum duty cycle T x 、T y 、T z And T w Is obtained to be equal to I A Or I B Or I C First current measurement value I 1 (ii) a When having the minimum duty cycle T x 、T y 、T z And T w Is obtained by A or-I B or-I C Second current measurement value I 2 (ii) a And calculating the period T of the PWM signal through three shunt resistors R Sh1 、R Sh2 And R Sh3 Average value of current of
Finally, the average value is compared
Low-pass filtering to obtain DCCurrent consumption I S 。
The present invention also supports a dual shunt topology comprising two shunt resistors as shown in fig. 10.
Therefore, in the third aspect of the present invention, in order to measure the DC current consumption I of the motor S A power supply control circuit for a synchronous machine, for example a three-phase brushless DC machine (i.e. a BLDC machine) or a permanent magnet synchronous machine PMSM, having a machine phase current I is proposed A 、I B And I C The power supply control circuit comprises a generating period T and a duty ratio T x 、T y 、T z And T w The power control circuit comprises two shunt resistors R Sh1 And R Sh2 For dependent on phase current signals I of the synchronous machine shunt Calculating DC Current consumption I S 。
The microcontroller is configured to obtain a crossing of the shunt resistor R during T-0 or T/2 Sh1 Measured value of phase current I of the electric machine shunt1 Wherein, I shunt1 ＝I A (ii) a Obtaining R across a shunt resistor (320) during T-0 or T/2 Sh2 Measured value of phase current I of the electric machine shunt2 Wherein, I shunt2 ＝I B (ii) a Obtaining a third phase current I C ＝-I A -I B (ii) a When having the maximum duty cycle T x 、T y 、T z And T w Is obtained to be equal to I A Or I B Or I C First current value I 1 (ii) a When having the minimum duty cycle T x 、T y 、T z And T w Is obtained to be equal to-I A or-I B or-I C Second current value I 2 (ii) a And calculating the period T of the PWM signal through three shunt resistors R Sh1 、R Sh2 Average value of current of
Finally, the average value is compared
Low pass filtering to obtain DC current consumption I S 。
Drawings
For a better understanding of the above explanations and for the purpose of providing examples only, some non-limiting drawings are included, which schematically depict practical embodiments.
Fig. 1 shows a power supply control circuit according to the prior art, which uses a shunt resistor in the DC-link of the power supply to measure the DC current consumption I S 。
Fig. 2 shows a power supply control circuit according to the prior art that uses shunt resistors for phase current sensing and additional electronics to measure the DC current consumption (105) I S 。
FIG. 3 shows a power supply control circuit according to the present invention using shunt resistors for phase current sensing to calculate DC current consumption (105) I S 。
Fig. 4 shows the PWM of the microcontroller.
Fig. 5 and 6 show the current measurements during the period T.
Fig. 7 shows different duty cycles of the PWM signal.
Fig. 8 shows a low-pass filtering of the average value of the current.
Fig. 9 shows a power supply control circuit using a three shunt resistor topology according to the present invention.
Fig. 10 shows a power supply control circuit using a dual shunt resistor topology according to the present invention.
Detailed Description
Single shunt topology:
FIG. 3 shows a power control circuit (300) according to the present invention that calculates DC current consumption (105) I by a microcontroller using a shunt resistor (215) S . Fig. 3 also shows a DC source (105) and an input AC filter (103), in particular an LC filter. Control ofThe circuit (300) includes a microcontroller/PWM generator control block (310) that generates a PWM signal (as shown in fig. 4) for a power inverter (120) that powers the synchronous machine (130). The microcontroller/PWM generator block (310) controls the current in the synchronous motor (130) based on a control algorithm. The microcontroller also implements the calculation of the DC current consumption (105) I S The routine of (1).
Therefore, in order to calculate the DC current consumption (105) I by the microcontroller S The microcontroller is configured to obtain a current through the shunt resistor (215) R during T Shunt Of the electrical machine (130) of (1) 1 And passes through shunt resistor (320) R during T Shunt Of the electrical machine (130) of (1) 2 。
Fig. 4 shows a PWM signal (400). As shown in fig. 4, software in the microcontroller (310) drives the synchronous motor (130) by generating a PWM signal (400) for the power inverter (120).
Signals A, B and C are PWM signals that drive three half bridges of a power inverter (120) connected to three phases of a motor (130). In the figure, only one period T of the PWM signal is shown. Typical frequencies of these signals are 20kHz, but may be 8kHz to 25kHz, depending on the characteristics of the motor and the application, and even wider ranges. FIG. 5 shows the duty cycle T of the PWM signal x 、T y 、T z And T w And may vary from cycle T.
FIG. 5 shows a PWM signal (400), a duty cycle T of the PWM signal (400) x 、T y 、T z And T w Through a shunt resistor (215) R Shunt Current of (I) shunt Through a shunt resistor (215) R during T Shunt Of the electrical machine (130) of (1) 1 Across shunt resistor (215) R during T Shunt Of the electrical machine (130) of (1) 2 . To determine the duty cycle of the PWM signal (400), the software of the microcontroller (310) uses the three-phase currents of the synchronous machine. To measure these currents, the control circuit contains one shunt resistor (as shown in fig. 3), three shunt resistors (as shown in fig. 9), or two shunt resistors (as shown in fig. 10).
The voltage drop is proportional to the current:
V shunt ＝R shunt ·i shunt
measuring shunt resistor (215) R per cycle T Shunt Twice: once in the region (501) (current I) 1 ) Once again in the region (502) (current I) 2 ). Preferably, the areas (501) and (502) on the left side of the period T are used above the areas (501) and (502) on the right side. Examples of measurement points are shown in fig. 5 with circles.
In addition, the measured current I 1 And I 2 With phase current of motor I A 、I B And I C The correspondence between them depends on the duty cycle T x 、T y 、T z And T w And depends on the mode of the PWM signal (400).
For the example of FIG. 5, motor phase current I A 、I B And I C Is calculated as follows:
I A ＝I 1
I B ＝I 1 +I 2
I C ＝-I 2
at the time of obtaining the measuring current I 1 And I 2 Thereafter, the controller (310) is configured to calculate:
wherein,
is passed through resistor (215) R during period T of PWM signal (400) shown in fig. 6 shunt Average value of (a).
The period and duty cycle T of the PWM signal are known to software running in the microcontroller (310) x 、T y 、T z And T w . Thus, it is possible to vary the duty cycle T x 、T y 、T z And T w Calculates the activation time T of the regions (501) and (502) of the difference 1 And T 2 So that:
T 1 ＝T x +T w
T 2 ＝T y +T z
the above equation results in:
in some cases, as shown in fig. 7, the PWM signal in the single-shunt topology may be asymmetric for some PWM periods. In these periods, T z And T w May be related to T x And T y Different, and possibly even negative. The graph in FIG. 7 shows the time T x 、T y 、T z And T w And the case they should be negative.
At this time, software running in the microcontroller (310) has an average value of the current passing through the shunt resistor (215) at each cycle of the PWM signal
A low-pass, Infinite Impulse Response (IIR), discrete-time filter can be implemented in the software of the microcontroller (310). The filter being adapted to the average value of the current per PWM period T
The output of the filter is the calculated input current of the power supply (105). Fig. 8 shows a schematic diagram of a low-pass filter (800).
The low pass filter (800) may be an IIR filter or any other type of filter, and it may be of any order (first order, second order, etc.). The low pass filter (800) must be a low pass filter with 0dB gain in DC and no resonant peak. The cut-off frequency of the low-pass filter (800) can be selected according to the frequency of the PWM signal (400) and the electrical speed range of the motor (130). The cut-off frequency of the low-pass filter (800) may be less than those other frequencies. For example, for a PWM signal having a frequency of 20kHz and an electrical speed of the motor of 45 to 370 electrical revolutions per second, the cut-off frequency of the low pass filter (800) may be set to 15 Hz.
3, shunting topology:
fig. 9 shows a power control circuit (300) for the motor (130). An advantage of the configuration of the power supply control circuit (300) is that it enables more accurate phase current readings and involves less acoustic noise and less Total Harmonic Distortion (THD). The power control circuit (300) includes a microcontroller/PWM generator control block (310) that generates six PWM signals for a power inverter (120) that powers a synchronous motor (130). A microcontroller/PWM generator block (310) controls the current in the synchronous motor (130) based on a control algorithm. The control circuit (300) calculates the DC current consumption I based on the phase current signals, as in the single-shunt topology S . The power control circuit (300) comprises three shunt resistors R Sh1 、R Sh2 And R Sh3 For measuring each phase current.
Thus, the microcontroller (310) is configured to obtain that the synchronous machine (130) passes through the shunt resistor (315) R Sh1 Measured value of phase current I shunt1 (ii) a Obtaining a cross-shunt resistor (320) R Sh2 Phase current measurement value I of the motor (130) shunt2 (ii) a And obtaining a cross-over shunt resistor (325) R Sh3 Phase current measurement value I of the motor (130) shunt3 . In contrast to the single-shunt topology, the phase current of the motor is sampled at the beginning of the PWM period T with three shunts as shown in fig. 11. In some examples, a sampling point with three shunts may be placed in the middle of a PWM period. Thus, with three shunts, the motor 3 phase current can be read directly: i is A 、I B And I C . Thus, I shunt1 ＝I A 、I shunt2 ＝I B And I shunt3 ＝I C . To be able to apply the formula used in the single shunt topology, I must be calculated 1 And I 2 The value of (c):
current I 1 The current of the phase that must be equal to the maximum duty cycle. For example, in the diagram of fig. 11:
I 1 ＝I A
current I 2 Must equal the negative value of the phase current for which the duty cycle is minimal. For example, in the diagram of fig. 11:
I 2 ＝-I C
activation time T 1 And T 2 The calculation mode of (2) is the same as that of the single shunt topology:
accordingly, the microcontroller (310) is configured to calculate:
wherein,
is passed through three shunt resistors (315, 320, 325) R during a period T of the PWM signal (400) Sh1 、R Sh2 And R Sh3 Average value of the current of (1).
Finally, the mean is averaged similarly to the single-tap topology
Low pass filtering to obtain DC current consumption (105) I S 。
2, shunting topology:
fig. 10 shows a power control circuit (300) of the motor (130). The control circuit (300) calculates the DC current consumption I based on the phase current signals, as in the single-shunt topology S . The power control circuit (300) comprises two shunt resistors R Sh1 And R Sh2 For measuring each phase current.
Thus, with two shunts, the current of two phases of the motor can be read directly, e.g. I A And I B The other current is calculated such that they add up to zero:
I C ＝-I A -I B
in contrast to the single shunt topology, as shown in fig. 11, with two shunts, the current of the phases of the motor is sampled at the beginning of the PWM period T. In some examples, the sampling point with two shunts may be placed in the middle of the PWM period.
To be able to apply the formula used in the single shunt topology, I must be calculated 1 And I 2 The value of (c):
current I 1 The current of the phase that must be equal to the maximum duty cycle. For example, in the diagram of fig. 11:
I 1 ＝I A
current I 2 Must equal the negative value of the phase current for which the duty cycle is minimal. For example, in the diagram of fig. 11:
I 2 ＝-I C
activation time T 1 And T 2 The calculation mode of (2) is the same as that of the single shunt topology:
thus, the microcontroller (310) calculates:
wherein,
is passed through two shunt resistors (315, 320) R during a period T of the PWM signal (400) Sh1 And R Sh2 And average value of the current of the sum.
Finally, the mean is averaged similarly to the single-tap topology
Low pass filtering to obtain DC current consumption (105) I S 。
Although reference has been made to a particular embodiment of the invention, it will be evident to a person skilled in the art that numerous variations and modifications can be made to the power control circuit architecture described herein, and that all the details mentioned can be substituted by other technically equivalent ones, without departing from the scope of protection defined by the appended claims.
Claims (6)
1. A power supply control circuit (300) for a synchronous machine (130) having a machine phase current I A 、I B And I C The power control circuit (300) includes generating a phase current I for phase current I A 、I B And I C Has a period T and a duty cycle T as a fraction of time x 、T y 、T z And T w Wherein the PWM signal is activated or deactivated, the power control circuit (300) being characterized in that it comprises an input AC filter (103) and a shunt resistor (215) R shunt For calculating the DC current consumption (105) I S ，
Wherein the microcontroller (310) is configured to:
-obtaining a current through a shunt resistor (215) R during T Shunt Of the electrical machine (130) of (1) 1 Wherein, I 1 Equal to having a maximum duty cycle T x 、T y 、T z And T w Motor phase current I of PWM signal A Or I B Or I C ；
-obtaining a current through a shunt resistor (215) R during T Shunt Of the electrical machine (130) of (1) 2 Wherein, I 2 Equal to having a minimum duty cycle T x 、T y 、T z And T w Motor phase current-I of PWM signal of A or-I B or-I C ；
-obtaining
Wherein,
is passed through resistor (215) R during period T of PWM signal shunt Average value of (d); and
to the mean value
Low pass filtering to obtain DC current consumption (105) I S 。
2. The power control circuit (300) of claim 1, wherein the synchronous motor (130) is a three-phase brushless DC motor, a BLDC motor, or a permanent magnet synchronous motor PMSM.
3. A power supply control circuit (300) for a synchronous machine (130) having a machine phase current I A 、I B And I C The power control circuit (300) includes generating phase current I for the motor A 、I B And I C Has a period T and a duty cycle T as a fraction of time x 、T y 、T z And T w Wherein the PWM signal is activated or deactivated, the power control circuit (300) being characterized in that it comprises an input AC filter (103) and three shunt resistors (315, 320, 325) R Sh1 、R Sh2 And R Sh3 For calculating the DC current consumption (105) I S ，
Wherein the microcontroller (310) is configured to:
-obtaining a current through said shunt resistor (315) R during T-0 or T/2 Sh1 Phase current measurement value I of the electric machine (130) shunt1 Wherein, I shunt1 ＝I A ；
-obtaining a current through said shunt resistor (320) R during T-0 or T/2 Sh2 Phase current measurement value I of the electric machine (130) shunt2 Wherein, I shunt2 ＝I B ；
-obtaining a current through said shunt resistor (325) R during T-0 or T/2 Sh3 Phase current measurement value I of the electric machine (130) shunt3 Wherein, I shunt3 ＝I C ；
-obtaining and having a maximum duty cycle T x 、T y 、T z And T w Of the PWM signal of A Or I B Or I C Equal first current measurements I 1 ；
-obtaining and having a minimum duty cycle T x 、T y 、T z And T w Of PWM signal of A or-I B or-I C Equal second current measurement I 2 ；
-calculating:
wherein,
is passed through three shunt resistors (315, 320, 325) R during the period T of the PWM signal Sh1 、R Sh2 And R Sh3 Average value of the current of (a); and
-for said mean value
Low pass filtering is performed to obtain DC current consumption (105) I S 。
4. A power control circuit (300) according to claim 3, wherein the synchronous motor (130) is a three-phase brushless DC motor, i.e. a BLDC motor, or a permanent magnet synchronous motor PMSM.
5. A power supply control circuit (300) for a synchronous machine (130) having a machine phase current I A 、I B And I C The power control circuit (300) includes generating a phase current I for the phase A 、I B And I C A microcontroller (310) of the PWM signal of (1), theThe PWM signal has a period T and a duty ratio T as a time fraction x 、T y 、T z And T w Wherein the PWM signal is activated or deactivated, the power control circuit (300) being characterized in that it comprises an input AC filter (103) and two shunt resistors (315, 320) R Sh1 And R Sh2 For generating a phase current signal I in dependence on the motor (130) shunt Calculating DC current consumption (105) I S ，
Wherein the microcontroller (310) is configured to:
-obtaining a current through a shunt resistor (315) R during T ═ 0 or T/2 Sh1 A phase current measurement value I of the electric machine (130) shunt1 Wherein, I shunt1 ＝I A ；
-obtaining R across the shunt resistor (320) during T-0 or T/2 Sh2 Of the electric machine (130) of (a) shunt2 Wherein, I shunt2 ＝I B ；
-obtaining a third phase current I C ＝-I A -I B ；
-obtaining and having a maximum duty cycle T x 、T y 、T z And T w Of the PWM signal of A Or I B Or I C Equal first current value I 1 ；
-obtaining and having a minimum duty cycle T x 、T y 、T z And T w Of PWM signal of A or-I B or-I C Equal second current value I 2 ；
-calculating:
wherein,
is passed through a resistor (315) R during a period T of the PWM signal Sh1 Current of (I) shunt Average value of (d); and
to the mean value
Low pass filtering is performed to obtain DC current consumption (105) I S 。
6. A power control circuit (300) according to claim 5, wherein the synchronous motor (130) is a three-phase brushless DC motor, BLDC motor, or a permanent magnet synchronous motor, PMSM.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20382039.4 | 2020-01-23 | ||
| EP20382039 | 2020-01-23 | ||
| PCT/EP2021/050725 WO2021148308A1 (en) | 2020-01-23 | 2021-01-14 | Power supply control circuits with shunt resistors for synchronous motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114982124A true CN114982124A (en) | 2022-08-30 |
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ID=69400506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180010584.9A Pending CN114982124A (en) | 2020-01-23 | 2021-01-14 | Power supply control circuit with shunt resistor for synchronous motor |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4094355A1 (en) |
| CN (1) | CN114982124A (en) |
| WO (1) | WO2021148308A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005074115A1 (en) * | 2004-01-30 | 2005-08-11 | Matsushita Electric Industrial Co., Ltd. | Position sensorless control method of permanent magnet synchronous motor with shunt in the inverter module |
| JP5417051B2 (en) * | 2009-06-11 | 2014-02-12 | 日立アプライアンス株式会社 | Inverter control device, and air conditioner and washing machine using the same |
-
2021
- 2021-01-14 CN CN202180010584.9A patent/CN114982124A/en active Pending
- 2021-01-14 WO PCT/EP2021/050725 patent/WO2021148308A1/en unknown
- 2021-01-14 EP EP21700222.9A patent/EP4094355A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021148308A1 (en) | 2021-07-29 |
| EP4094355A1 (en) | 2022-11-30 |
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