CN115395857A - Control circuit for motor speed regulation and motor speed regulation control circuit - Google Patents
Control circuit for motor speed regulation and motor speed regulation control circuit Download PDFInfo
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- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
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Abstract
A control circuit for motor speed regulation and a motor speed regulation control circuit are used for improving the condition that a single chip microcomputer has high cost for motor speed regulation, and the control circuit comprises a timer and a charging and discharging circuit; the timer is triggered by a zero detection signal to output a first switching signal and a first charging signal, and is triggered by a power-on signal to output a second switching signal and a first discharging signal; the charging and discharging circuit starts charging in response to the first charging signal, thereby outputting the power-on signal via a delay period, and the charging and discharging circuit starts discharging in response to the first discharging signal, wherein the delay period is adjustable.
Description
Technical Field
The invention relates to a control circuit for motor speed regulation and a motor speed regulation control circuit.
Background
At present, one scheme of speed regulation of an alternating current motor is that a single chip microcomputer outputs PWM to control a thyristor conduction angle so as to realize speed regulation, but the single chip microcomputer is high in cost and poor in economy.
Disclosure of Invention
The invention aims to provide a control circuit for motor speed regulation and a motor speed regulation control circuit, which are used for improving the condition that the motor speed regulation cost is higher by using a single chip microcomputer.
In a first aspect, the present invention provides a control circuit for regulating speed of a motor, according to an embodiment of the present invention, the control circuit comprising:
the timer is triggered by the zero point detection signal to output a first switch signal and a first charging signal, and is triggered by the electrifying signal to output a second switch signal and a first discharging signal; and
a charge and discharge circuit responsive to the first charge signal to begin charging, thereby outputting the power-up signal over a delay period, the delay period being adjustable responsive to the first discharge signal to begin discharging.
In one or more embodiments, the charge and discharge circuit includes a first charge and discharge circuit that starts charging in response to the first charge signal and starts discharging in response to the first discharge signal;
the charging and discharging circuit further comprises an adjusting module, the adjusting module is provided with an adjustable first threshold voltage, the adjusting module is triggered by the voltage of the first charging and discharging circuit being larger than or equal to the first threshold voltage to output a first signal, and the first signal triggers to output the power-on signal.
In one or more embodiments, the adjustment module comprises:
a potentiometer providing the adjustable first threshold voltage; and
and the comparator is triggered by the voltage of the first charging and discharging circuit being greater than or equal to the first threshold voltage to output the first signal.
In one or more embodiments, the first charging and discharging circuit includes a first charging resistor, and a resistance of the first charging resistor is adjustable to adjust a charging speed of the first charging and discharging circuit.
In one or more embodiments, the resistance of the first charging resistor is continuously adjustable.
In one or more embodiments, the charge and discharge circuit further includes a second charge and discharge circuit that starts charging in response to the first signal, thereby outputting the power-up signal.
In one or more embodiments, the timer has a second threshold voltage, the power-up signal is a voltage of the second charge and discharge circuit that is greater than or equal to the second threshold voltage, and the timer is triggered to output the second switching signal and the first discharge signal by the voltage of the second charge and discharge circuit being greater than or equal to the second threshold voltage.
In one or more embodiments, the second charging and discharging circuit includes a second charging resistor, and a resistance value of the second charging resistor is adjustable to adjust a charging speed of the second charging and discharging circuit.
In one or more embodiments, the second charging resistor includes a plurality of fixed resistors connected in parallel, and the second charging resistor switches between the plurality of fixed resistors, so that one of the plurality of fixed resistors is connected to the second charging and discharging circuit.
In a second aspect, the present invention provides a motor speed control circuit, which includes the above control circuit according to an embodiment of the present invention;
the motor speed regulation control circuit further comprises a switch module, the switch module is used for controlling the on-off of the power supply and the motor, and the switch module is turned off in response to the first switch signal and turned on in response to the second switch signal.
In one or more embodiments, the switch module comprises:
the optical coupling module is turned off in response to the first switching signal and turned on in response to the second switching signal; and
and the thyristor module is switched on in response to the on-off of the optocoupler module and the on-off of the thyristor module.
In one or more embodiments, the motor speed regulation control circuit further includes a zero point detection circuit, and the zero point detection circuit is triggered by a voltage zero crossing point of the power supply to output the zero point detection signal.
The embodiment of the invention has at least the following beneficial effects:
the control circuit replaces a single chip microcomputer to control, the single chip microcomputer is not needed, the cost is low, and the economy is better.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and examples, in which:
FIG. 1 is a circuit diagram of a motor speed control circuit;
reference numerals:
1-a motor;
2-zero detection circuit;
3-a timer;
4-a switch module;
41-an optical coupling module;
42-thyristor module;
5-a charge-discharge circuit;
51-a first charge and discharge circuit;
511-a first charging resistor;
52-a regulation module;
521-a comparator;
522-a potentiometer;
523-standard reference voltage source;
53-a second charge and discharge circuit;
531-second charging resistance.
Detailed Description
The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms different from those described herein, and it will be readily appreciated by those skilled in the art that the present invention can be implemented in many different forms without departing from the spirit and scope of the invention.
The terms "first" and "second" may be used interchangeably to distinguish one feature from another.
Fig. 1 shows a circuit configuration of a motor speed control circuit. The motor speed regulation control circuit comprises a control circuit, as shown in fig. 1, the control circuit regulates the rotation speed of the motor 1 by regulating the power supplied by a power supply (not shown in the figure) to the motor 1, the control circuit controls the power supply to be conducted with the motor 1 only in a part of time intervals in each power supply power frequency cycle, the time intervals are called conduction time intervals, the motor 1 is powered only in the conduction time intervals in each power supply power frequency cycle, and the conduction time intervals between the power supply and the motor 1 are regulated by the control circuit to regulate the rotation speed of the motor 1. In the illustrated embodiment, the motor 1 is a shaded pole motor, the rotational speed of which is regulated by a control circuit. In another embodiment, the control circuit regulates the speed of another motor, the motor 1 being another type of motor.
With continued reference to fig. 1, the control circuit includes a timer 3, the timer 3 being configured to receive a zero detection signal. In the illustrated embodiment, the timer 3 is a 555 timer, and the 555 timer has a TRIG terminal that receives the zero detection signal. In another embodiment, the timer 3 is another type of timer.
With continued reference to fig. 1, in the illustrated embodiment, the motor speed control circuit further includes a zero point detection circuit 2, the zero point detection circuit 2 is connected to a power source (not shown in the figure), and the zero point detection circuit 2 outputs a zero point detection signal in response to a voltage zero crossing point of the power source, that is, when the voltage of the power source crosses the zero point, the zero point detection circuit 2 is further connected to a timer 3 to output the zero point detection signal to the timer 3, and in the illustrated embodiment, the zero point detection circuit 2 is connected to a TRIG terminal of a 555 timer.
With continued reference to fig. 1, the timer 3 outputs a first switching signal in response to the zero point detection signal. In the illustrated embodiment, the 555 timer further has an OUT terminal, and when the TRIG terminal receives the zero detection signal, the OUT terminal outputs a first switch signal, and the first switch signal is at a high level, that is, the OUT terminal outputs a high level.
Continuing to refer to fig. 1, in the illustrated embodiment, the motor speed regulation control circuit further includes a switch module 4, the power supply is connected to the motor 1 through the switch module 4 to supply power to the motor 1, the switch module 4 controls on/off of the power supply and the motor 1, the switch module 4 is further connected to the timer 3, and is connected to the OUT terminal of the 555 timer, and is configured to receive the first switch signal, the switch module 4 receives the first switch signal, the trigger switch module 4 is turned off, the power supply is electrically connected to the motor 1, the motor 1 cannot be supplied with power, and the motor 1 is powered off.
With continued reference to fig. 1, in the illustrated embodiment, the switch module 4 includes an optical coupler module 41, the optical coupler module 41 includes an optical coupler, the optical coupler module 41 is connected to the timer 3, the optical coupler module 41 is connected to an OUT terminal of the 555 timer, and is configured to receive a first switch signal, and in response to the first switch signal, the optical coupler module 41 is turned off. Switch module 4 still includes thyristor module 42, thyristor module 42 includes the thyristor, power supply passes through thyristor module 42 and connects motor 1, thyristor module 42 still connects opto-coupler module 41, the gate connection opto-coupler module 41 of thyristor, it is ending in response to opto-coupler module 41, also be at the moment that opto-coupler module 41 ends, thyristor module 42 still keeps switching on, switch module 4 switches on, power supply is connected with motor 1 electricity, motor 1 obtains the power supply, the circular telegram of motor 1, this on-state lasts to the moment that power supply passes through the electric current of thyristor and falls to 0, also be the moment of power supply's electric current zero crossing, because the electric current of thyristor falls to 0, thyristor module 42 ends, switch module 4 ends. When the switch module 4 receives the first switch signal, the switch module 4 is not immediately turned off, but remains turned on, and is turned off after a certain period of time, which is called a first on-period, where the on-period includes a first on-period, and the first on-period is a period between a voltage zero-crossing point and a current zero-crossing point of the power supply. When the optical coupling module 41 receives the first switching signal, the optical coupling module 41 is turned off, the thyristor module 42 is turned on, the switching module 4 is turned on, and after the first on period, the thyristor module 42 is turned off, and the switching module 4 is turned off. In other embodiments, the switch module 4 has other configurations.
With continued reference to fig. 1, the timer 3 also outputs a first charging signal in response to the zero point detection signal. In the illustrated embodiment, the 555 timer further has a DISC terminal, and when the TRIG terminal receives the zero detection signal, the DISC terminal outputs a first charging signal, where the first charging signal is in a high impedance state, that is, the DISC terminal outputs the high impedance state.
With continued reference to fig. 1, the control circuit further includes a charging and discharging circuit 5, the charging and discharging circuit 5 is connected to the timer 3, and is configured to receive the first charging signal, and in response to the first charging signal, the charging and discharging circuit 5 starts charging, so that the power-on signal is output after a delay period, where the delay period is adjustable. In the illustrated embodiment, the charge and discharge circuit 5 is connected to the DISC terminal of the 555 timer.
With continued reference to fig. 1, in the illustrated embodiment, the charging and discharging circuit 5 further includes a first charging and discharging circuit 51, the first charging and discharging circuit 51 is connected to the timer 3 for receiving a first charging signal, and in response to the first charging signal, the first charging and discharging circuit 51 starts charging. In the illustrated embodiment, the first charging and discharging circuit 51 includes a first capacitor C1 and a first capacitor power source VCC1, the first charging and discharging circuit 51 is connected to the DISC terminal of the 555 timer, and the first capacitor power source VCC1 charges the first capacitor C1 in response to the first charging signal, that is, when the first charging and discharging circuit 51 receives the first charging signal. With continued reference to fig. 1, in the illustrated embodiment, the charging and discharging circuit 5 further includes a regulating module 52, the regulating module 52 has an adjustable first threshold voltage V2, and the regulating module 52 is connected to the first charging and discharging circuit 51 and is triggered by the voltage of the first charging and discharging circuit 51 being greater than or equal to the first threshold voltage V2 to output the first signal. In the illustrated embodiment, the adjusting module 52 is connected to the first capacitor C1, and as the first capacitor VCC1 charges the first capacitor C1, the voltage V1 of the first capacitor C1 rises, and in response to that the voltage V1 of the first capacitor C1 is greater than or equal to the first threshold voltage V2, that is, when the voltage V1 of the first capacitor C1 rises to the first threshold voltage V2, the adjusting module 52 outputs the first signal, and the charging and discharging circuit 5 outputs the power-on signal accordingly. In another embodiment, the charge and discharge circuit 5 has another structure.
With continued reference to fig. 1, in the illustrated embodiment, the adjustment module 52 includes a comparator 521 and a potentiometer 522. The potentiometer 522 provides a first threshold voltage V2, two ends of the potentiometer 522 are respectively connected to Vref1 and Vref2 of the standard reference voltage source 523, the voltage at the output end of the potentiometer 522 is the first threshold voltage V2, and the first threshold voltage V2 is adjustable, for example, the voltage at the output end of the potentiometer 522 is adjustable by rotating a knob. The comparator 521 is connected to the first charging and discharging circuit 51, a positive input end of the comparator 521 is connected to the first capacitor C1, the comparator 521 is further connected to the potentiometer 522, a negative input end of the comparator 521 is connected to an output end of the potentiometer 522, the comparator 521 compares a voltage V1 of the first capacitor C1 with a voltage V2 of the output end of the potentiometer 522, and in response to that the voltage V1 of the first capacitor C1 is greater than or equal to the voltage V2 of the potentiometer 522, that is, when the voltage V1 of the first capacitor C1 rises to the voltage V2 of the potentiometer 522, the comparator 521 outputs a first signal, the first signal is in a high impedance state, that is, the comparator 521 outputs a high impedance state, and the charging and discharging circuit 5 outputs a power-on signal accordingly. The time period during which the voltage V1 of the first capacitor C1 rises to the first threshold voltage V2 is referred to as a first delay time period, where the delay time period includes the first delay time period, and the voltage V2 at the output end of the potentiometer 522 is adjusted, so as to adjust the length of the first delay time period, and further adjust the length of the delay time period. In other embodiments, the conditioning module 52 is of other configurations.
With continued reference to fig. 1, in the illustrated embodiment, the charging and discharging circuit 5 further includes a second charging and discharging circuit 53, and the second charging and discharging circuit 53 is connected to the comparator 521 for receiving the first signal, and in response to the first signal, the second charging and discharging circuit 53 starts to charge, and thus outputs a power-on signal. In the illustrated embodiment, the second charge/discharge circuit 53 includes a second capacitor C2 and a second capacitor power source VCC2, the second charge/discharge circuit 53 is connected to the output end of the comparator 521, and in response to the first signal, that is, when the second charge/discharge circuit 53 receives the first signal, the second capacitor C2 is charged by the second capacitor power source VCC2, the voltage V3 of the second capacitor C2 rises, and the second capacitor C2 outputs the power-on signal accordingly. In another embodiment, the charge and discharge circuit 5 outputs the power-on signal by other means.
With continued reference to fig. 1, the timer 3 is connected to the second charging and discharging circuit 53, and is further configured to receive a power-on signal, and in response to the power-on signal, the timer 3 outputs a second switching signal. In the illustrated embodiment, the 555 timer further has a THRES terminal, the THRES terminal has a second threshold voltage Vth, the THRES terminal is connected to the second capacitor C2 of the second charging and discharging circuit 53, the power-on signal is a voltage V3 of the second capacitor C2 greater than or equal to the second threshold voltage Vth, when the THRES terminal receives the voltage V3 rising to the second threshold voltage Vth, the OUT terminal outputs the second switching signal, and the second switching signal is at a low level, that is, the OUT terminal outputs a low level. The period in which the voltage V3 of the second capacitor C2 rises to the second threshold voltage Vth is referred to as a second delay period, and the delay periods further include a second delay period that is subsequent to the first delay period, and the duration of the delay period is the sum of the durations of the first delay period and the second delay period.
With continued reference to fig. 1, in the illustrated embodiment, the switch module 4 is further configured to receive a second switch signal, and in response to the second switch signal, that is, when the switch module 4 receives the second switch signal, the switch module 4 is turned on, the power supply is electrically connected to the motor 1, the motor 1 is powered, and the motor 1 is powered on.
With continued reference to fig. 1, in the illustrated embodiment, the optical coupling module 41 is further configured to receive a second switching signal, and in response to the second switching signal, the optical coupling module 41 is turned on. In response to the optocoupler module 41 being turned on, the thyristor module 42 is turned on. When the optical coupling module 41 receives the second switch signal, the optical coupling module 41 is turned on, the thyristor module 42 is turned on, and the switch module 4 is turned on. In another embodiment, the switch module 4 has another structure.
With continued reference to fig. 1, the timer 3 also outputs a first discharge signal in response to the power-up signal. In the illustrated embodiment, when the THRES terminal receives the power-on signal, the DISC terminal outputs a first discharge signal, and the first discharge signal is at a low level, that is, the DISC terminal outputs a low level.
With continued reference to fig. 1, the charge and discharge circuit 5 is further configured to receive a first discharge signal, and in response to the first discharge signal, the charge and discharge circuit 5 starts discharging.
With continued reference to fig. 1, in the illustrated embodiment, the first charge and discharge circuit 51 is further configured to receive a first discharge signal, and in response to the first discharge signal, the first charge and discharge circuit 51 starts discharging. In the illustrated embodiment, in response to the first discharging signal, that is, when the first charging/discharging circuit 51 receives the first discharging signal, the first capacitor power source VCC1 stops charging the first capacitor C1, the first capacitor C1 starts discharging, and the voltage V1 of the first capacitor C1 decreases to zero.
With continued reference to fig. 1, in the illustrated embodiment, the adjustment module 52 outputs the second signal in response to the voltage V1 of the first capacitor C1 being less than the first threshold voltage V2, i.e., when the voltage V1 of the first capacitor C1 falls below the first threshold voltage V2.
With continued reference to fig. 1, in the illustrated embodiment, the comparator 521 compares the voltage V1 of the first capacitor C1 with the voltage V2 at the output terminal of the potentiometer 522, and in response to the voltage V1 of the first capacitor C1 being less than the voltage V2 of the potentiometer 522, that is, when the voltage V1 of the first capacitor C1 drops to be less than the voltage V2 of the potentiometer 522, the comparator 521 outputs a second signal, which is at a low level, that is, the comparator 521 outputs a low level.
With continued reference to fig. 1, in the illustrated embodiment, the second charge and discharge circuit 53 is further configured to receive a second signal, and in response to the second signal, the second charge and discharge circuit 53 begins discharging. In the illustrated embodiment, in response to the second signal, that is, when the second charge/discharge circuit 53 receives the second signal, the second capacitor power source VCC2 stops charging the second capacitor C2, the second capacitor C2 discharges, and the voltage V3 of the second capacitor C2 decreases to zero.
As can be seen from the foregoing, after the charging and discharging circuit 5 receives the first discharging signal, the voltage V1 of the first capacitor C1 in the first charging and discharging circuit 51 is reduced to zero, and the voltage V3 of the second capacitor C2 in the second charging and discharging circuit 53 is reduced to zero, so as to ensure that after the next first charging signal is triggered, the first capacitor C1 in the first charging and discharging circuit 51 starts to be charged from the voltage V1 being zero, the second capacitor C2 in the second charging and discharging circuit 53 starts to be charged from the voltage V3 being zero, the first delay time period is unchanged, the second delay time period is unchanged, and thus the delay time period is unchanged.
With continued reference to fig. 1, when the charging and discharging circuit 5 stops outputting the power-on signal, the timer 3 still outputs the second switching signal, and the motor 1 is still powered on. In the illustrated embodiment, when the second capacitor C2 discharges to reduce the voltage V3 thereof to be less than the second threshold voltage Vth, the THRES terminal receives the voltage V3 less than the second threshold voltage Vth, the OUT terminal still outputs a low level, the switch module 4 is turned on, the power supply is electrically connected to the motor 1, the motor 1 is powered, and the motor 1 is powered on.
The zero-crossing points of the voltage of the power supply are periodic, so that the zero-point detection signals are periodic, the control circuit repeats the process when each zero-point detection signal arrives, and each power supply power frequency period between every two zero-point detection signals comprises a delay time period and a conduction time period. In the conduction period, the power supply is electrically connected with the motor 1, the motor 1 is powered on, the conduction period comprises a second conduction period besides the first conduction period, the second conduction period is the period of each power supply power frequency cycle except the delay period, and the conduction period is the sum of the first conduction period and the second conduction period. By adjusting the first threshold voltage V2, the control circuit can adjust the length of the delay period in each power supply power frequency cycle, thereby adjusting the length of the second conduction period in each power supply power frequency cycle, further adjusting the length of the conduction period in each power supply power frequency cycle, and further adjusting the rotation speed of the motor 1. Compared with the scheme that the single chip microcomputer outputs PWM to control the conduction angle of the thyristor, the control circuit replaces the single chip microcomputer, the single chip microcomputer is not needed, the cost is low, and the economy is better.
With continued reference to fig. 1, in the illustrated embodiment, the first charging/discharging circuit 51 further includes a first charging resistor 511, and a resistance value of the first charging resistor 511 is adjustable to adjust a charging speed of the first capacitor C1, so as to adjust a length of the first delay period, adjust a length of the delay period, further adjust a length of the conduction period, and adjust a rotation speed of the motor 1. In the illustrated embodiment, the first charging resistor 511 includes an adjustable resistor RP and a fixed resistor R1 connected in series, and the resistance of the adjustable resistor RP is adjusted, so as to adjust the resistance of the first charging resistor 511, and change the charging speed of the first capacitor C1 by the first capacitor power supply VCC 1.
In addition, in an actual use scenario, due to factors such as manufacturing errors, an error exists between the actual operating characteristic and the nominal operating characteristic of the motor 1, so that one motor 1 is connected to the control circuit, the voltage V2 at the output end of the potentiometer 522 in the control circuit is adjusted to a target value, and an error still exists between the actual rotating speed and the target rotating speed of the motor 1, which brings troubles to the application of the control circuit. The adjustable first charging resistor 511 provides another motor speed regulation mode, so that when the voltage V2 at the output end of the potentiometer 522 is regulated to a target value, the actual rotating speed of the motor 1 is regulated to the target rotating speed by adjusting the first charging resistor 511.
With continued reference to fig. 1, in the illustrated embodiment, the resistance of the first charging resistor 511 is continuously adjustable. In the illustrated embodiment, the adjustable resistor RP is a sliding resistor, and the resistance of the adjustable resistor RP is continuously adjustable, so that the resistance of the first charging resistor 511 is continuously adjustable, and the change of the resistance of the first charging resistor 511 is continuous, which is convenient for adjusting the first charging resistor 511 and adjusting the rotation speed of the motor 1. In another embodiment, the adjustable resistor RP has other structures.
With continued reference to fig. 1, in the illustrated embodiment, the second charging and discharging circuit 53 further includes a second charging resistor 531, and the resistance of the second charging resistor 531 is adjustable to adjust the charging speed of the second capacitor C2, so as to adjust the duration of the second delay period, adjust the duration of the delay period, further adjust the duration of the conducting period, and adjust the rotation speed of the motor 1.
In addition, in an actual use scene, due to factors such as different regions, the power frequencies of the power supplies connected to the control circuit are different, so that even if the voltage V2 at the output end of the potentiometer 522 is unchanged, when one motor 1 is connected to the power supplies of different power frequencies through the control circuit, the rotating speed of the motor 1 is also changed, which brings trouble to the application of the control circuit. The adjustable second charging resistor 531 provides another motor speed regulation mode, so that when the voltage V2 at the output end of the potentiometer 522 is regulated to a target value and is not changed, even if one motor 1 is connected to power supplies of different power frequencies through a control circuit, the rotating speed of the motor 1 can be regulated to keep unchanged by regulating the second charging resistor 531.
With continued reference to fig. 1, in the illustrated embodiment, the second charging resistor 531 includes a plurality of fixed resistors connected in parallel, and the second charging resistor 531 switches between the plurality of fixed resistors, so that one of the plurality of fixed resistors is connected to the second charging and discharging circuit 53, and each of the plurality of fixed resistors corresponds to a power frequency of the power supply, thereby facilitating an operator to directly select according to the power frequency of the power supply. In the illustrated embodiment, the second charging resistor 531 includes a fixed resistor R2 and a fixed resistor R3 connected in parallel, and the second charging resistor 531 is switched between the fixed resistor R2 and the fixed resistor R3 by a jumper cap J1 to selectively connect to the second charging/discharging circuit 53, where the fixed resistor R2 and the fixed resistor R3 respectively correspond to a power supply at a power frequency of 60HZ and a power supply at a power frequency of 50HZ, and 60HZ and 50HZ are common power frequencies of the power supplies. Under the power supply of power frequency 60HZ, the power frequency period is short, so that the resistance value of the fixed resistor R2 is small, and the charging speed of the second capacitor C2 is high. Under the power supply of power frequency 50HZ, the power frequency cycle is long, so that the resistance value of the fixed resistor R3 is large, and the charging speed of the second capacitor C2 is low. The resistance values of the fixed resistor R2 and the fixed resistor R3 enable the ratio of the delay time interval to the power frequency period to be unchanged as long as the voltage V2 at the output end of the potentiometer 522 is unchanged no matter the power supply with the power frequency of 60HZ or the power supply with the power frequency of 50HZ is accessed, and therefore the rotating speed of the motor 1 is guaranteed to be unchanged. In another embodiment, the second charging resistor 531 has another structure.
In the illustrated embodiment, the on-period Ton within each power supply power frequency cycle T is calculated as follows.
The relationship between V1 and t is as follows:
wherein, V1 is the voltage of the first capacitor C1, VCC1 is the voltage of the first capacitor power VCC1, e is a natural constant, t is time, RP is the resistance of the adjustable resistor RP, R1 is the resistance of the fixed resistor R1, and C1 is the capacitance of the first capacitor C1.
Let V1= V2, t1 is obtained from equation (1):
where t1 is the first delay period, ln is the natural logarithm, and V2 is the voltage at the output of the potentiometer 522.
The relationship between V3 and t is as follows:
where V3 is the voltage of the second capacitor C2, VCC2 is the voltage of the second capacitor power VCC2, and R2 is the resistance of the fixed resistor R2, the calculation takes the second charging resistor 531 as the fixed resistor R2 as an example, and C2 is the capacitance of the second capacitor C2.
Let V3= Vth, t2 is obtained from equation (3):
where t2 is a second delay period and Vth is a second threshold voltage.
Thereby, the delay period Toff is obtained:
Toff＝t1+t2 (5)
further, the second on period t4 is obtained:
t4＝T–Toff (6)
further, the on-period Ton is obtained:
Ton＝t3+t4 (7)
where t3 is the first conduction period.
Although the present invention has been disclosed in the context of embodiments thereof, it is not intended to be limited thereto and modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (12)
1. A control circuit for regulating speed of a motor, comprising:
the timer is triggered by the zero detection signal to output a first switching signal and a first charging signal, and triggered by the power-on signal to output a second switching signal and a first discharging signal; and
a charge and discharge circuit responsive to the first charge signal to begin charging, thereby outputting the power-up signal over a delay period, the delay period being adjustable responsive to the first discharge signal to begin discharging.
2. The control circuit for motor regulation according to claim 1, wherein the charge and discharge circuit comprises a first charge and discharge circuit that starts charging in response to the first charge signal and starts discharging in response to the first discharge signal;
the charging and discharging circuit further comprises an adjusting module, the adjusting module is provided with an adjustable first threshold voltage, the adjusting module is triggered to output a first signal by the voltage of the first charging and discharging circuit being larger than or equal to the first threshold voltage, and the first signal triggers to output the electrifying signal.
3. The control circuit for motor speed regulation of claim 2, wherein the regulation module comprises:
a potentiometer providing the adjustable first threshold voltage; and
and the comparator is triggered by the voltage of the first charge-discharge circuit being greater than or equal to the first threshold voltage to output the first signal.
4. The control circuit for motor speed regulation according to claim 2, wherein the first charge-discharge circuit comprises a first charging resistor, and the resistance value of the first charging resistor is adjustable to adjust the charging speed of the first charge-discharge circuit.
5. The control circuit for regulating the speed of a motor according to claim 4, wherein the resistance of said first charging resistor is continuously adjustable.
6. The control circuit for motor speed regulation of claim 2, wherein the charge and discharge circuit further comprises a second charge and discharge circuit that initiates charging in response to the first signal, thereby outputting the power-up signal.
7. The control circuit for motor speed regulation according to claim 6, wherein the timer has a second threshold voltage, the power-up signal is a voltage of the second charge and discharge circuit which is greater than or equal to the second threshold voltage, and the timer is triggered by the voltage of the second charge and discharge circuit being greater than or equal to the second threshold voltage to output the second switching signal and the first discharge signal.
8. The control circuit for motor speed regulation according to claim 6, wherein the second charge-discharge circuit comprises a second charging resistor, and the resistance value of the second charging resistor is adjustable to adjust the charging speed of the second charge-discharge circuit.
9. The control circuit for regulating the speed of a motor of claim 8, wherein said second charging resistor comprises a plurality of fixed resistors connected in parallel, said second charging resistor being switched between said plurality of fixed resistors such that one of said plurality of fixed resistors is connected to said second charging and discharging circuit.
10. A motor speed control circuit comprising a control circuit as claimed in any one of claims 1 to 9;
the motor speed regulation control circuit further comprises a switch module, the switch module is used for controlling the on-off of the power supply and the motor, and the switch module is turned off in response to the first switch signal and turned on in response to the second switch signal.
11. The motor speed control circuit of claim 10, wherein the switch module comprises:
the optical coupling module is turned off in response to the first switching signal and turned on in response to the second switching signal; and
and the thyristor module is switched on in response to the on-off of the optocoupler module and the on-off of the thyristor module.
12. The motor speed regulation control circuit of claim 10 further comprising a zero point detection circuit triggered by a zero crossing of the voltage of the power supply to output the zero point detection signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211129675.7A CN115395857B (en) | 2022-09-16 | 2022-09-16 | Control circuit for motor speed regulation and motor speed regulation control circuit |
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| CN202211129675.7A CN115395857B (en) | 2022-09-16 | 2022-09-16 | Control circuit for motor speed regulation and motor speed regulation control circuit |
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| CN115395857B CN115395857B (en) | 2024-04-05 |
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| US20170085196A1 (en) * | 2015-09-17 | 2017-03-23 | Silergy Semiconductor Technology (Hangzhou) Ltd | Driving circuit and driving method for permanent magnet synchronous motor |
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|---|---|
| CN115395857B (en) | 2024-04-05 |
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