CN211352086U - Motor control circuit - Google Patents
Motor control circuit Download PDFInfo
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- CN211352086U CN211352086U CN201922289479.6U CN201922289479U CN211352086U CN 211352086 U CN211352086 U CN 211352086U CN 201922289479 U CN201922289479 U CN 201922289479U CN 211352086 U CN211352086 U CN 211352086U
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Abstract
The utility model provides a motor control circuit, this motor control circuit's PWM signal generator is used for producing two sets of PWM signals, switch switching circuit has two sets of switches that correspond with two sets of PWM signals, forward excitation voltage and reverse excitation voltage are applyed to the motor to two sets of switches on the switch switching circuit respectively control power, position sensor installs on the rotor of motor, this position sensor is connected with PWM signal generator, a rotor position for detect the motor, send motor phase commutation signal to PWM signal generator, when this motor phase commutation signal jumps, the on-state change of two sets of switches that the two sets of PWM signals that PWM signal generator produced control respectively to correspond, with the excitation voltage switching-over that control power applyed to the motor. Through implementing the utility model discloses, make the voltage switching-over at motor both ends fast, can be so that the on-time of motor in the switching-over cycle increases, the motor can obtain higher rotational speed.
Description
Technical Field
The utility model relates to a motor control technology field, concretely relates to motor control circuit.
Background
The brushless direct current motor feeds back the position of the rotor to the control circuit through the Hall sensor, so that the controller can know the accurate time of the phase commutation of the motor, and then the PWM modulation signal is controlled to conduct reversely, but in the actual operation process of the motor, when the rotating speed of the motor fluctuates due to external factors, the Hall period can also change, for example, the Hall period is shortened, the Hall jump edge can occur before the preset position at the moment, as shown in figure 1, the PWM conduction signal in the period is not finished, the PWM conduction signal still continues to occur along the original direction, the voltage continues to conduct in the period, the current can be caused to continue to rise in the next Hall period at the moment, the peak value occurs, the motor continues to fluctuate, and the operation is unstable.
In order to solve the technical problem, in the prior art, in a half cycle of motor commutation, when a hall jump edge is detected, a PWM signal is delayed to be turned on, and before a predicted time point when a next jump edge comes, the PWM signal is turned off in advance to adjust voltage commutation so as to avoid current from continuously rising in the next hall cycle, and keep the numbers of positive and negative period PWM consistent, thereby maintaining the current stability of the motor.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a motor control circuit to solve the motor control circuit in the prior art, because the on-time of the voltage in the positive and negative cycle is reduced, the problem that the performance of the motor is reduced can be caused.
According to a first aspect, an embodiment of the present invention provides a motor control circuit, including: a PWM signal generator for generating two sets of PWM signals; the power supply is connected with the input end of the switch switching circuit; the motor is connected with the output end of the switch switching circuit; the switch switching circuit is provided with two groups of switches corresponding to the two groups of PWM signals, and the two groups of switches respectively control the power supply to apply a forward excitation voltage and a reverse excitation voltage to the motor; the position sensor is arranged on the rotor of the motor, is connected with the PWM signal generator, and is used for detecting the position of the rotor of the motor and sending a motor phase reversing signal to the PWM signal generator; when the motor phase commutation signal jumps, the two groups of PWM signals generated by the PWM signal generator respectively control the change of the conduction states of the two corresponding groups of switches so as to control the power supply to commutate the excitation voltage applied to the motor.
With reference to the first aspect, in a first implementation manner of the first aspect, two sets of switches of the switching circuit are respectively connected to a winding of the electric machine, and are used for applying the excitation voltage to the winding.
With reference to the first aspect, in a second implementation manner of the first aspect, the switch switching circuit includes: the switch comprises a first switch, a second switch, a third switch and a fourth switch, wherein the first switch and the fourth switch are a first group of switches, and the second switch and the third switch are a second group of switches; the control ends of the first switch, the second switch, the third switch and the fourth switch are respectively connected with the output end of the PWM signal generator; the output end of the first switch is connected with the input end of the second switch, and the first end of the winding of the motor is connected between the output end of the first switch and the input end of the second switch; the output end of the third switch is connected with the input end of the fourth switch, and the second end of the motor winding is connected between the output end of the third switch and the input end of the fourth switch.
With reference to the second implementation manner of the first aspect, in a third implementation manner of the first aspect, the two sets of PWM signals include: a first PWM signal, a second PWM signal, a third PWM signal, and a fourth PWM signal; wherein the first and fourth PWM signals are a first set of PWM signals and the second and third PWM signals are a second set of PWM signals; when the motor phase commutation signal jumps, the first PWM signal and the fourth PWM signal are used to control the first switch and the fourth switch to be in a conducting state, the second PWM signal and the third PWM signal are used to control the second switch and the third switch to be in a disconnecting state, and the excitation voltage is switched from a forward voltage to a reverse voltage; or when the motor phase commutation signal jumps, the first PWM signal and the fourth PWM signal are used to control the first switch and the fourth switch to be in an off state, the second PWM signal and the third PWM signal are used to control the second switch and the third switch to be in an on state, and the excitation voltage is switched from a reverse voltage to a forward voltage.
With reference to the third embodiment of the first aspect, in the fourth embodiment of the first aspect, in a first half period of a phase commutation signal of the motor, the first PWM signal and the fourth PWM signal respectively control the first switch and the fourth switch to be intermittently turned on at the same frequency, the second PWM signal and the third PWM signal are both in a low level state to control the second switch and the third switch to be turned off, and the power supply applies a forward excitation voltage to the motor; and in a second half period, the second PWM signal and the third PWM signal respectively control the second switch and the fourth switch to be conducted intermittently at the same frequency, the first PWM signal and the fourth PWM signal are both in a low level state to control the first switch and the fourth switch to be switched off, and the power supply applies reverse excitation voltage to the motor.
With reference to the third embodiment of the first aspect, in a fifth embodiment of the first aspect, in a first half period of a phase-commutation signal of the motor, the first PWM signal controls the first switch to be turned on intermittently, and the second PWM signal controls the second switch to be turned on complementarily with the second switch; when the first PWM signal is switched from a high level to a low level, the second PWM signal is switched from the low level to the high level by delaying a first preset time, and when the first PWM signal is switched from the low level to the high level, the second PWM signal is switched from the high level to the low level by advancing a second preset time, so that the second switch is turned on and off in advance with respect to the first switch; the third PWM signal is in a low level state to enable the third switch to be switched off, the fourth PWM signal is in a high level state to enable the fourth switch to be switched on, and the power supply applies a forward excitation voltage to the motor; during a second half-cycle, the third PWM signal controls the third switch to conduct intermittently, and the fourth PWM signal controls the fourth switch to conduct complementarily with the third switch; when the third PWM signal is switched from a high level to a low level, the fourth PWM signal is switched from the low level to the high level by delaying a third preset time, and when the third PWM signal is switched from the low level to the high level, the fourth PWM signal is switched from the high level to the low level by advancing the fourth preset time, so that the fourth switch is turned on and off in advance with respect to the third switch; the first PWM signal is in a low level state to turn off the first switch, the second PWM signal is in a high level state to turn on the second switch, and the power supply applies a reverse excitation voltage to the motor.
With reference to the second embodiment of the first aspect, in a sixth embodiment of the first aspect, an input terminal of the first switch and an input terminal of the third switch are respectively connected to a positive electrode of the power supply; and the output end of the second switch and the output end of the fourth switch are respectively connected with the negative pole of the power supply.
With reference to the third implementation manner of the first aspect, in a seventh implementation manner of the first aspect, the voltage commutation circuit further includes: an amplifying circuit; the input end of the amplifying circuit is connected with the PWM signal generator, and the output end of the amplifying circuit is connected with the switch switching circuit, and the amplifying circuit is used for receiving the first PWM signal, the second PWM signal, the third PWM signal and the fourth PWM signal, amplifying the first PWM signal, the second PWM signal, the third PWM signal and the fourth PWM signal, and outputting the amplified signals to the switch switching circuit.
With reference to the seventh implementation manner of the first aspect, in an eighth implementation manner of the first aspect, the amplifying circuit includes: a first sub-amplifying circuit and a second sub-amplifying circuit; the input end of the first sub-amplifying circuit is connected with the PWM signal generator, and the output end of the first sub-amplifying circuit is respectively connected with the control end of the first switch and the control end of the second switch; and the input end of the second sub-amplifying circuit is connected with the PWM signal generator, and the output end of the second sub-amplifying circuit is respectively connected with the control end of the third switch and the control end of the fourth switch.
With reference to any one of the embodiments of the first aspect, in a ninth embodiment of the first aspect, the position sensor is a hall sensor.
The embodiment of the utility model provides a technical scheme has following advantage:
the embodiment of the utility model provides a motor control circuit, this motor control circuit includes PWM signal generator, a power supply, a motor, a position sensor and a switch switching circuit, wherein this PWM signal generator is used for producing two sets of PWM signals, the switch switching circuit has two sets of switches that correspond to two sets of PWM signals, the power supply is connected with the input of switch switching circuit, the motor is connected with the output of switch switching circuit, two sets of switches on the switch switching circuit control the power supply to apply forward excitation voltage and reverse excitation voltage to the motor respectively, the position sensor is installed on the rotor of motor, this position sensor is connected with PWM signal generator, be used for detecting the rotor position of motor, send motor phase commutation signal to PWM signal generator, when this motor phase commutation signal jumps, two sets of PWM signals that PWM signal generator produced control the on-state change of two sets of corresponding switches respectively, to control commutation of the excitation voltage applied by the power supply to the motor. Through the motor control circuit of the embodiment of the utility model, the waveform detected by the position sensor is monitored in real time, when a motor phase reversing signal is received, the on-state change of two groups of switches of the switch switching circuit is immediately controlled through the PWM signal, namely the PWM wave in the positive on-state is cut off and is immediately conducted in reverse, namely the PWM signal controls the excitation voltage to be cut off in the positive direction and conducted in the reverse direction, thereby the voltage at two ends of the motor is quickly reversed, compared with the motor control mode in the prior art, the on-time of the motor in the reversing period is prolonged, the motor can obtain higher rotating speed, and the current waveform of the motor in the period can not continuously rise to generate a peak value, and in positive and negative half reversing periods, the total on-time of the PWM wave is the same, therefore, the current waveform in the positive and negative periods is basically the same, namely, the current peak value in, so that the motor operates stably.
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a current peak occurring when a Hall transition edge is coming and a PWM signal is not ended in the prior art;
fig. 2 is a schematic structural diagram of a motor control circuit according to an embodiment of the present invention;
fig. 3 is another schematic diagram of a motor control circuit according to an embodiment of the present invention;
fig. 4a is a schematic waveform diagram of a motor control circuit according to an embodiment of the present invention;
fig. 4b is another waveform schematic of a motor control circuit in accordance with an implementation of the present invention;
reference numerals: 11-PWM signal generator, 12-switch switching circuit, 121-first switch, 122-second switch, 123-third switch, 124-fourth switch, 13-power supply, 14-motor, 15-amplifying circuit, 151-first sub-amplifying circuit, 152-second sub-amplifying circuit and 16-position sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
An embodiment of the utility model provides a motor control circuit, as shown in fig. 2, this motor switching circuit includes: the control circuit comprises a PWM signal generator 11, a switch switching circuit 12, a power supply 13, a motor 14 and a position sensor 16, wherein the PWM signal generator 11 is used for generating two groups of PWM signals, the control end of the switch switching circuit 12 is connected with the output end of the PWM signal generator 11, the input end of the switch switching circuit 12 is connected with the power supply 13, the output end is connected with the motor 14, the switch switching circuit 12 has a first state of enabling forward voltage to be conducted at two ends of the motor 14 and a second state of enabling reverse voltage to be conducted at two ends of the motor 14, and when the switch switching circuit 12 receives the PWM signals sent by the PWM signal generator 11, the first state is immediately switched to the second state or the second state is switched to the first state. Specifically, the switch switching circuit 12 has two sets of switches corresponding to two sets of PWM signals, the two sets of switches respectively control the power supply 13 to apply a forward excitation voltage and a reverse excitation voltage to the motor 14, the rotor of the motor 14 is mounted with a position sensor 16, the position sensor 16 is connected to the PWM signal generator 11 for detecting the rotor position of the motor 14 and sending a motor phase commutation signal to the PWM signal generator 11, the position sensor 16 is a hall sensor, the motor phase commutation signal is a hall signal, when the motor phase commutation signal (hall signal) jumps, the two sets of PWM signals generated by the PWM signal generator 11 respectively control the on-state change of the corresponding two sets of switches, that is, if the state between the first set of switches is on, the corresponding first set of PWM signals control the first set of switches to be immediately off, and if the state between the second set of switches is off, its corresponding second set of PWM signals controls it to turn on immediately and vice versa, thereby controlling the commutation of the excitation voltage applied by the power supply 13 to the electric machine 14, i.e. controlling the switching of the excitation voltage from a forward voltage to a reverse voltage, or vice versa.
Through the motor control circuit of the embodiment of the present invention, when the PWM signal generator 11 generates two sets of PWM signals, the two sets of PWM signals can control the switch switching circuit 12 to switch from the first state to the second state at once, the switching speed is fast, so that the voltage at two ends of the motor 14 can be quickly commutated, compared with the motor control method in the prior art, the energization time of the motor 14 in the commutation period can be increased, the motor 14 can obtain a higher rotation speed, and in a half commutation period of the motor 14, when the next hall jump edge comes, the excitation voltage applied to the motor 14 is turned off in the forward direction and turned on in the reverse direction, so that the current waveform of the motor 14 in the period can not continuously rise to generate a peak value, and in the positive and negative half commutation periods of the motor 14, the total conduction time of the PWM waves is the same, so that the current waveforms in the positive and negative periods are basically the same, i.e., the peak current values in the positive and negative periods are consistent, so that the motor 14 operates smoothly.
In a preferred embodiment, two sets of switches of the switching circuit 12 are connected to the windings of the electric machine 14, the switching circuit 12 being configured to apply an excitation voltage to the windings. Specifically, as shown in fig. 3, the switch switching circuit 12 includes: the control ends of the first switch 121, the second switch 122, the third switch 123 and the fourth switch 124 are respectively connected with the output end of the PWM signal generator 11, the output end of the first switch 121 is connected with the input end of the second switch 122, the first end of the winding of the motor 14 is connected between the output end of the first switch 121 and the input end of the second switch 122, the output end of the third switch 123 is connected with the input end of the fourth switch 124, and the second end of the winding is connected between the output end of the third switch 123 and the input end of the fourth switch 124. An input terminal of the first switch 121 and an input terminal of the third switch 123 are respectively connected to a positive electrode of the power supply 13, and an output terminal of the second switch 122 and an output terminal of the fourth switch 124 are respectively connected to a negative electrode of the power supply 13.
In one embodiment, the PWM signal generator 11 generates four PWM signals at the hall signal transition: a first PWM signal, a second PWM signal, a third PWM signal, and a fourth PWM signal, which are respectively used to control the first switch 121, the second switch 122, the third switch 123, and the fourth switch 124 to be opened or closed, where the four switches are IGBT switches. Specifically, when the hall signal jumps, the PWM signal generator 11 sends a first PWM signal, a second PWM signal, a third PWM signal, and a fourth PWM signal, where the first PWM signal and the fourth PWM signal are used to control the first switch 121 and the fourth switch 124 to be in an on state, the second PWM signal and the third PWM signal are used to control the second switch 122 and the third switch 123 to be in an off state, and at this time, the voltage excitation voltage is switched from the reverse voltage to the forward voltage, or when the hall signal jumps, the first PWM signal and the fourth PWM signal control the first switch 121 and the fourth switch 124 to be in an off state, the second PWM signal and the third PWM signal are used to control the second switch 122 and the third switch 123 to be in an on state, and the excitation voltage is switched from the forward voltage to the reverse voltage at this time.
Specifically, as shown in fig. 4a, in a first period of the phase commutation signal of the motor, in a first half period, that is, an upper half period of the hall signal, the first PWM signal is switched at a high level and a low level in a pulse form, and the fourth PWM signal is in the same pulse form as the first PWM signal, so as to control the first switch 121 and the fourth switch 124 to be intermittently turned on at the same frequency, and in the upper half period, the second PWM signal and the third PWM signal are both in a low level state, so as to control the second switch 122 and the third switch 123 to be turned off, respectively, at which time, the power supply 13 applies a forward excitation voltage to the motor 14, and a current flows from the first end to the second end of the winding; in the second half period, i.e. the upper half period of the hall signal, the second PWM signal is switched at high and low levels in the form of pulses, the third PWM signal is in the same form as the second PWM signal, so as to control the second switch 122 and the fourth switch 124 to be intermittently turned on at the same frequency, at the moment, the first PWM signal and the fourth PWM signal are both in a low level state, so as to control the first switch 121 and the fourth switch 124 to be turned off, at the moment, the power supply 13 applies a reverse excitation voltage to the motor 14, and current flows from the second end to the first end of the winding.
As an alternative embodiment, as shown in fig. 4b, during the first period of the motor phase commutation signal, during the first half period, i.e. during the first half period of the hall signal, the first PWM signal is switched at high and low levels in a pulse form to control the first switch 121 to be intermittently turned on, the second PWM signal is also switched at high and low levels in a pulse form, but the waveform of the second PWM signal is in complementary conduction with the waveform of the first PWM signal to control the first switch 121 to be in complementary conduction with the second switch 122, and, as shown in fig. 4b, when the first PWM signal is switched from high level to low level, the second PWM signal is switched from low level to high level by delaying the first preset time, and when the first PWM signal is switched from low level to high level, the second PWM signal is switched from high level to low level by advancing the second preset time, so that the second switch 122 is turned on and turned off in advance with respect to the first switch 121, in this half period, the third PWM signal is in a low state to turn off the third switch 123, the fourth PWM signal is in a high state to turn on the fourth switch 124, the power supply 13 applies a forward excitation voltage to the motor 14, and a current flows from the first end to the second end of the winding. It should be noted that the complementary conduction of the second PWM signal and the first PWM signal is to actually accumulate current inside the winding when the first PWM signal is in a low level state, and at this time, the second PWM signal is in a high level, so that the second switch 122 is closed, and thus the current in the winding flows from the second switch 122 to a negative pole or a ground terminal; the purpose of switching the second PWM signal into the high level state in a delayed manner and turning off the high level state in an early manner with respect to the first PWM signal is to avoid the situation that the first PWM signal and the second PWM signal are at the high level at the same time, so that when the first switch 121 and the second switch 122 are simultaneously turned on, a current directly flows from the power supply 13 to the ground through the first switch 121 and the second switch 122, and a short circuit occurs.
During the second half period, i.e. during the lower half period of the hall signal, as shown in connection with fig. 4b, the third PWM signal controls the third switch 123 to conduct intermittently, and the fourth PWM signal controls the fourth switch 124 to conduct complementarily with the third switch 123; when the third PWM signal is switched from the high level to the low level, the fourth PWM signal is switched from the low level to the high level by delaying the third preset time, and when the third PWM signal is switched from the low level to the high level, the fourth PWM signal is switched from the high level to the low level by advancing the fourth preset time, so that the fourth switch 124 is turned on and turned off in advance with respect to the third switch 123; during this half period, the first PWM signal is in a low state to turn off the first switch 121, and the second PWM signal is in a high state to turn on the second switch 122, so that the power supply 13 applies a reverse excitation voltage to the motor 14, i.e., a current flows from the second end to the first end of the winding. It should be noted that the purpose of complementary conduction of the third PWM signal and the fourth PWM signal, and the purpose of switching the fourth PWM signal into the high level state in a delay manner and switching the fourth PWM signal into the high level state in an early manner with respect to the third PWM signal are similar to the first PWM signal and the second PWM signal in the upper half cycle, and are not described herein again.
Through the motor control circuit of the embodiment of the utility model, the PWM signal generator 11 generates four PWM signals, the four PWM signals can rapidly and respectively control the four switches of the switch switching circuit 12 to be turned on or off, the first switch 121 and the fourth switch 124 to be turned on or off at the same time, the second switch 122 and the third switch 123 to be turned on or off at the same time, thereby controlling the voltage conduction direction at the two ends of the winding to be switched rapidly, compared with the prior art that the PWM signal is conducted in a delay way and closed in advance, the motor control circuit of the embodiment of the utility model, during a voltage commutation period, the on-time of the voltage is lengthened, so that the conduction time of the winding is increased, and because the total conduction time of the PWM in the positive and negative periods is the same, the current waveforms of the windings in the positive and negative periods are basically the same, namely the current peak values in the positive and negative periods are consistent, so that the motor performance is stable.
In order to better switch the PWM signal to control the switch switching circuit 12, in a preferred embodiment, as shown in fig. 3, the motor control circuit of the embodiment of the present invention further includes: and an amplifying circuit 15, wherein an input end of the amplifying circuit 15 is connected with the PWM signal generator 11, an output end of the amplifying circuit 15 is connected with the switch switching circuit 12, and the amplifying circuit 15 is configured to receive the PWM signal, amplify the PWM signal, and output the amplified PWM signal to the switch switching circuit 12. The PWM signal generated by the PWM signal generator 11 is amplified by the amplifier circuit 15 and then input to the switch switching circuit 12, so that the switching control of the switch switching circuit 12 can be more accurate and timely.
Specifically, the amplifying circuit 15 includes: the input end of the first sub-amplifier 151 is connected to the PWM signal generator 11, the output end of the first sub-amplifier 151 is connected to the control end of the first switch 121 and the control end of the second switch 122, the input end of the second sub-amplifier 152 is connected to the PWM signal generator 11, and the output end of the second sub-amplifier 152 is connected to the control end of the third switch 123 and the control end of the fourth switch 124, that is, every two PWM signals are amplified by one amplifier circuit and then output to the IGBT switch, so that the control accuracy of the whole circuit is improved.
The motor control circuit of the embodiment of the utility model monitors the Hall waveform detected by the Hall sensor in real time, when the Hall jump edge (namely when receiving the phase commutation signal of the motor) switches on PWM, if the Hall period changes, in a half Hall period, the PWM wave does not end and the next Hall jump edge comes, no matter where the PWM wave in the period is switched on, the PWM wave is switched off and reversely switched on, namely the PWM signal controls the excitation voltage to be switched off in the forward direction and on in the reverse direction, thereby the voltage at the two ends of the motor 14 is quickly commutated, compared with the motor control mode in the prior art, the power-on time of the motor 14 in the commutation period is increased, the motor 14 can obtain higher rotating speed, and the current waveform of the motor 14 in the period can not continuously rise and appear peak value, and in a positive and negative half Hall period, the total conduction time of the PWM waves is the same, so that the current waveforms in the positive and negative periods are basically the same, namely the current peak values in the positive and negative periods are consistent, and the motor runs stably.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (8)
1. A motor control circuit, comprising:
a PWM signal generator (11) for generating two sets of PWM signals;
a power supply (13) connected to an input terminal of the switch switching circuit (12);
a motor (14) connected to an output terminal of the switching circuit (12);
the switch switching circuit (12) is provided with two groups of switches corresponding to the two groups of PWM signals, and the two groups of switches respectively control the power supply (13) to apply a forward excitation voltage and a reverse excitation voltage to the motor (14);
and the position sensor (16) is arranged on the rotor of the motor (14), is connected with the PWM signal generator (11), and is used for detecting the rotor position of the motor (14) and sending a motor phase reversing signal to the PWM signal generator (11).
2. A motor control circuit according to claim 1, characterized in that two sets of switches of the switching circuit (12) are connected to the windings of the motor (14), respectively, for applying the excitation voltage to the windings.
3. The motor control circuit according to claim 1, characterized in that the switch switching circuit (12) comprises: a first switch (121), a second switch (122), a third switch (123), and a fourth switch (124), the first switch (121) and the fourth switch (124) being a first set of switches, the second switch (122) and the third switch (123) being a second set of switches;
the control ends of the first switch (121), the second switch (122), the third switch (123) and the fourth switch (124) are respectively connected with the output end of the PWM signal generator (11);
the output end of the first switch (121) is connected with the input end of the second switch (122), and the first end of the winding of the motor (14) is connected between the output end of the first switch (121) and the input end of the second switch (122);
an output of the third switch (123) is connected to an input of the fourth switch (124), and a second end of the winding is connected between an output of the third switch (123) and an input of the fourth switch (124).
4. A motor control circuit according to claim 3, characterized in that the input of the first switch (121) and the input of the third switch (123) are connected to the positive pole of the power source (13), respectively; the output end of the second switch (122) and the output end of the fourth switch (124) are respectively connected with the negative pole of the power supply (13).
5. The motor control circuit of claim 4 wherein said two sets of PWM signals comprise: a first PWM signal, a second PWM signal, a third PWM signal, and a fourth PWM signal; wherein the first and fourth PWM signals are a first set of PWM signals and the second and third PWM signals are a second set of PWM signals.
6. The motor control circuit of claim 5, further comprising: an amplifier circuit (15);
the amplifying circuit (15) has an input end connected to the PWM signal generator (11) and an output end connected to the switch switching circuit (12), and is configured to receive the first PWM signal, the second PWM signal, the third PWM signal, and the fourth PWM signal, amplify the first PWM signal, the second PWM signal, the third PWM signal, and the fourth PWM signal, and output the amplified signals to the switch switching circuit (12).
7. The motor control circuit according to claim 6, characterized in that the amplification circuit (15) comprises: a first sub-amplifier circuit (151) and a second sub-amplifier circuit (152);
the input end of the first sub-amplification circuit (151) is connected with the PWM signal generator (11), and the output end of the first sub-amplification circuit is respectively connected with the control end of the first switch (121) and the control end of the second switch (122);
and the input end of the second sub-amplification circuit (152) is connected with the PWM signal generator (11), and the output end of the second sub-amplification circuit is respectively connected with the control end of the third switch (123) and the control end of the fourth switch (124).
8. A motor control circuit according to any of claims 1-7, characterized in that the position sensor (16) is a Hall sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922289479.6U CN211352086U (en) | 2019-12-18 | 2019-12-18 | Motor control circuit |
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| CN201922289479.6U CN211352086U (en) | 2019-12-18 | 2019-12-18 | Motor control circuit |
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| CN211352086U true CN211352086U (en) | 2020-08-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113179096A (en) * | 2021-04-25 | 2021-07-27 | 珠海格力电器股份有限公司 | Delay circuit, motor device and motor system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113179096A (en) * | 2021-04-25 | 2021-07-27 | 珠海格力电器股份有限公司 | Delay circuit, motor device and motor system |
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