CN115395857B - 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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- CN115395857B CN115395857B CN202211129675.7A CN202211129675A CN115395857B CN 115395857 B CN115395857 B CN 115395857B CN 202211129675 A CN202211129675 A CN 202211129675A CN 115395857 B CN115395857 B CN 115395857B
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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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
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Abstract
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 switch signal and a first charging signal, and is triggered by a power-on signal to output a second switch signal and a first discharging signal; the charge-discharge circuit starts charging in response to the first charge signal, thereby outputting the power-on signal via a delay period, the charge-discharge circuit starts discharging in response to the first discharge signal, the delay period being 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 singlechip outputs PWM to control the conduction angle of a thyristor, so that speed regulation is realized, but the singlechip has higher cost and poor 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 high by using a singlechip.
In a first aspect, the present invention provides a control circuit for motor speed regulation, according to an embodiment of the present invention, the control circuit comprising:
a timer, wherein the zero detection signal triggers and outputs a first switch signal and a first charging signal, and the power-on signal triggers and outputs a second switch signal and a first discharging signal; and
and a charge-discharge circuit that starts charging in response to the first charge signal, thereby outputting the power-on signal via a delay period, and starts discharging in response to the first discharge signal, the delay period being adjustable.
In one or more embodiments, the charge-discharge circuit includes a first charge-discharge circuit that begins charging in response to the first charge signal and begins 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 voltage of the first charging and discharging circuit is larger than or equal to the first threshold voltage, the adjusting module triggers and outputs a first signal, and the first signal triggers and outputs the power-on signal.
In one or more embodiments, the adjustment module includes:
a potentiometer providing the adjustable first threshold voltage; and
and the comparator is triggered to output the first signal by the voltage of the first charge-discharge circuit being greater than or equal to the first threshold voltage.
In one or more embodiments, the first charge-discharge circuit includes a first charge resistor, and a resistance value of the first charge resistor is adjustable to adjust a charge speed of the first charge-discharge circuit.
In one or more embodiments, the resistance of the first charging resistor is continuously adjustable.
In one or more embodiments, the charge-discharge circuit further includes a second charge-discharge circuit that starts charging in response to the first signal, thereby outputting the power-on signal.
In one or more embodiments, the timer has a second threshold voltage, the power-on signal is a voltage of the second charge-discharge circuit that is equal to or greater than the second threshold voltage, and the timer is triggered by the voltage of the second charge-discharge circuit being equal to or greater than the second threshold voltage to output the second switching signal and the first discharge signal.
In one or more embodiments, the second charge-discharge circuit includes a second charge resistor, and a resistance value of the second charge resistor is adjustable to adjust a charge speed of the second charge-discharge circuit.
In one or more embodiments, the second charging resistor includes a plurality of fixed resistors connected in parallel with each other, 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 regulation control circuit, according to an embodiment of the present invention, the motor speed regulation control circuit includes the control circuit described above;
the motor speed regulation control circuit further comprises a switch module, wherein the switch module is used for controlling the on-off of the power supply and the motor, 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 switching module includes:
the optical coupling module is turned off in response to the first switch signal and turned on in response to the second switch signal; and
and the thyristor module is turned off in response to the cut-off of the optocoupler module, and is turned on in response to the conduction of the optocoupler module.
In one or more embodiments, the motor speed regulation control circuit further includes a zero point detection circuit that 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 singlechip to control, the singlechip is not required to be used, the cost is low, and the economical efficiency is better.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which:
FIG. 1 is a circuit diagram of a motor speed control circuit;
reference numerals:
1-a motor;
a 2-zero detection circuit;
3-a timer;
a 4-switch module;
41-an optocoupler module;
a 42-thyristor module;
a 5-charge-discharge circuit;
51-a first charge-discharge circuit;
511-a first charging resistor;
52-a regulating module;
521-comparators;
522—potentiometer;
523-standard reference voltage source;
53-a second charge-discharge circuit;
531-a second charging resistor.
Detailed Description
The present invention will be further described with reference to specific embodiments and drawings, in which more details are set forth in the following description in order to provide a thorough understanding of the present invention, but it will be apparent that the present invention can be embodied in many other forms than described herein, and that those skilled in the art may make similar generalizations and deductions depending on the actual application without departing from the spirit of the present invention, and therefore should not be construed to limit the scope of the present invention in terms of the content of this specific embodiment.
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 regulation 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 supply (not shown in the figure) to supply power to the motor 1, the control circuit controls the power supply to conduct with the motor 1 only in part of the time period within each power frequency period of the power supply, the time period is called as a conduction time period, the motor 1 is supplied with power only in the conduction time period within each power frequency period of the power supply, and the conduction time period of the power supply and the motor 1 is 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 adjusts the rotational speed of the other motor, and the motor 1 is 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 point detection signal. In the illustrated embodiment, the timer 3 is a 555 timer, and the 555 timer has a TRIG terminal, and the TRIG terminal 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 regulation 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), the zero point detection circuit 2 outputs a zero point detection signal in response to a voltage zero 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 the 555 timer.
With continued reference to fig. 1, in response to the zero point detection signal, the timer 3 outputs a first switching signal. In the illustrated embodiment, the 555 timer further has an OUT terminal, and when the TRIG terminal receives the zero point detection signal, the OUT terminal outputs a first switching signal, and the first switching signal is at a high level, that is, the OUT terminal outputs a high level.
With continued reference to fig. 1, in the illustrated embodiment, the motor speed regulation control circuit further includes a switch module 4, the power source is connected with the motor 1 through the switch module 4 to supply power to the motor 1, the switch module 4 controls the on-off of the power source and the motor 1, the switch module 4 is further connected with a timer 3, an OUT end of the timer is connected with 555, the timer is used for receiving a first switch signal, the switch module 4 receives the first switch signal, the switch module 4 is triggered to be turned off, the power source is disconnected from the electric connection of the motor 1, the motor 1 is not 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 optocoupler module 41, the optocoupler module 41 includes an optocoupler, the optocoupler module 41 is connected to the timer 3, the optocoupler module 41 is connected to an OUT terminal of the 555 timer, and is configured to receive a first switch signal, and the optocoupler module 41 is turned off in response to the first switch signal. The switch module 4 further comprises a thyristor module 42, the thyristor module 42 comprises a thyristor, the power supply is connected with the motor 1 through the thyristor module 42, the thyristor module 42 is further connected with an optocoupler module 41, the gate electrode of the thyristor is connected with the optocoupler module 41, the thyristor module 42 is still kept on in response to the cut-off of the optocoupler module 41, namely at the moment of cut-off of the optocoupler module 41, the switch module 4 is conducted, the power supply is electrically connected with the motor 1, the motor 1 is powered on, the conducting state is continued until the moment when the current of the power supply passing through the thyristor is reduced to 0, namely the moment of the current zero crossing of the power supply, the thyristor module 42 is cut-off due to the fact that the current of the thyristor is reduced to 0, and the switch module 4 is cut-off. When the switching module 4 receives the first switching signal, the switching module 4 is not turned off immediately, but still remains turned on, and is turned off after a certain period of time passes, which is called a first conduction period, where the aforementioned conduction period includes a first conduction period, and the first conduction period is a period between a voltage zero crossing point and a current zero crossing point of the power supply. When the optocoupler module 41 receives the first switching signal, the optocoupler module 41 is turned off, the thyristor module 42 is turned on, the switching module 4 is turned on, and after a first on period, the thyristor module 42 is turned off, and the switching module 4 is turned off. In another embodiment, the switch module 4 is of other construction.
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 end, and when the TRIG receives the zero detection signal, the DISC end outputs a first charging signal, and the first charging signal is in a high-resistance state, that is, the DISC end outputs a high-resistance state.
With continued reference to fig. 1, the control circuit further includes a charge-discharge circuit 5, where the charge-discharge circuit 5 is connected to the timer 3 and is configured to receive a first charge signal, and in response to the first charge signal, the charge-discharge circuit 5 starts charging, so that a power-on signal is output after a delay period, and 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 charge-discharge circuit 5 further includes a first charge-discharge circuit 51, the first charge-discharge circuit 51 being connected to the timer 3 for receiving a first charge signal, the first charge-discharge circuit 51 initiating charging in response to the first charge signal. In the illustrated embodiment, the first charge-discharge circuit 51 includes a first capacitor C1 and a first capacitor power supply VCC1, the first charge-discharge circuit 51 is connected to the DISC end of the 555 timer, and the first capacitor power supply VCC1 charges the first capacitor C1 in response to the first charging signal, that is, when the first charge-discharge circuit 51 receives the first charging signal. With continued reference to fig. 1, in the illustrated embodiment, the charge-discharge circuit 5 further includes an adjustment module 52, where the adjustment module 52 has an adjustable first threshold voltage V2, and the adjustment module 52 is connected to the first charge-discharge circuit 51, and is triggered by a voltage of the first charge-discharge circuit 51 being greater than or equal to the first threshold voltage V2 to output a first signal. In the illustrated embodiment, the adjusting module 52 is connected to the first capacitor C1, and as the first capacitor power VCC1 charges the first capacitor C1, the voltage V1 of the first capacitor C1 increases, and in response to the voltage V1 of the first capacitor C1 being equal to or greater than the first threshold voltage V2, that is, when the voltage V1 of the first capacitor C1 increases to the first threshold voltage V2, the adjusting module 52 outputs the first signal, and the charging/discharging circuit 5 outputs the power-on signal. In another embodiment, the charge-discharge circuit 5 has other structures.
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 can be adjusted by rotating a knob. The comparator 521 is connected to the first charge-discharge circuit 51, the positive input end of the comparator 521 is connected to the first capacitor C1, the comparator 521 is further connected to the potentiometer 522, the negative input end of the comparator 521 is connected to the output end of the potentiometer 522, the comparator 521 compares the voltage V1 of the first capacitor C1 with the voltage V2 of the output end of the potentiometer 522, and the charge-discharge circuit 5 outputs the power-on signal in response to the voltage V1 of the first capacitor C1 being 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 the first signal, the first signal is in the high-impedance state, that is, the comparator 521 outputs the high-impedance state. The period when the voltage V1 of the first capacitor C1 rises to the first threshold voltage V2 is referred to as a first delay period, where the delay period includes the first delay period, and the magnitude of the voltage V2 at the output end of the potentiometer 522 is adjusted, so as to adjust the length of the first delay period and further adjust the length of the delay period. In another embodiment, the adjustment module 52 is other structure.
With continued reference to fig. 1, in the illustrated embodiment, the charge-discharge circuit 5 further includes a second charge-discharge circuit 53, the second charge-discharge circuit 53 being coupled to the comparator 521 for receiving the first signal, in response to which the second charge-discharge circuit 53 begins to charge and thereby 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 supply VCC2, the second charge-discharge circuit 53 is connected to the output terminal of the comparator 521, and the second capacitor power supply VCC2 charges the second capacitor C2 in response to the first signal, that is, when the second charge-discharge circuit 53 receives the first signal, the voltage V3 of the second capacitor C2 rises, and the second capacitor C2 outputs a power-on signal. In another embodiment, the charge-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 charge-discharge 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 charge/discharge 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 the low level. The period when the voltage V3 of the second capacitor C2 rises to the second threshold voltage Vth is referred to as a second delay period, where the delay period further includes a second delay period, the second delay period is continuous with 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 source is electrically connected to the motor 1, the motor 1 is powered, and the motor 1 is energized.
With continued reference to fig. 1, in the illustrated embodiment, the optocoupler module 41 is further configured to receive a second switching signal, and in response to the second switching signal, the optocoupler module 41 is turned on. In response to the optocoupler module 41 turning on, the thyristor module 42 turns on. When the optocoupler module 41 receives the second switching signal, the optocoupler 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 is of other construction.
With continued reference to fig. 1, in response to the power-on signal, the timer 3 also outputs a first discharge signal. In the illustrated embodiment, when the THRES terminal receives the power-on signal, the DISC terminal outputs a first discharge signal, which is at a low level, that is, the DISC terminal outputs a low level.
With continued reference to fig. 1, the charge-discharge circuit 5 is further configured to receive a first discharge signal, and in response to the first discharge signal, the charge-discharge circuit 5 starts discharging.
With continued reference to fig. 1, in the illustrated embodiment, the first charge-discharge circuit 51 is further configured to receive a first discharge signal, and in response to the first discharge signal, the first charge-discharge circuit 51 initiates a discharge. In the illustrated embodiment, in response to the first discharge signal, that is, when the first charge-discharge circuit 51 receives the first discharge signal, the first capacitor power supply VCC1 stops charging the first capacitor C1, the first capacitor C1 starts to discharge, 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 drops 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 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, i.e., when the voltage V1 of the first capacitor C1 decreases to be less than the voltage V2 of the potentiometer 522, the comparator 521 outputs a second signal, which is at a low level, i.e., the comparator 521 outputs a low level.
With continued reference to fig. 1, in the illustrated embodiment, the second charge-discharge circuit 53 is further configured to receive a second signal, and in response to the second signal, the second charge-discharge circuit 53 initiates discharge. In the illustrated embodiment, the second capacitor power supply VCC2 stops charging the second capacitor C2 in response to the second signal, that is, when the second charge-discharge circuit 53 receives the second signal, 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 charge/discharge circuit 5 receives the first discharge signal, the voltage V1 of the first capacitor C1 in the first charge/discharge circuit 51 decreases to zero, and the voltage V3 of the second capacitor C2 in the second charge/discharge circuit 53 decreases to zero, so as to ensure that the first capacitor C1 in the first charge/discharge circuit 51 starts to charge from the voltage V1 to zero, and the second capacitor C2 in the second charge/discharge circuit 53 starts to charge from the voltage V3 to zero after the next first charge signal is triggered, so that the first delay period is unchanged and the second delay period is unchanged.
With continued reference to fig. 1, when the charge-discharge circuit 5 stops outputting the power-on signal, the timer 3 still outputs the second switching signal, and the motor 1 still is energized. 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 the low level, the switch module 4 is turned on, the power source is electrically connected to the motor 1, the motor 1 is powered, and the motor 1 is energized.
The zero crossing point of the voltage of the power supply has periodicity, so that the zero detection signals have periodicity, and when each zero detection signal arrives, the control circuit repeats the process, and each power frequency period between every two zero detection signals comprises a delay period and a conduction period. In the conduction period, the power supply is electrically connected with the motor 1, the motor 1 is powered, the motor 1 is electrified, the conduction period further comprises a second conduction period except the first conduction period, the second conduction period is a period except a delay period of each power frequency period of the power supply, and the conduction period is formed by adding the first conduction period and the second conduction period. The control circuit can adjust the length of the delay period in each power frequency period of the power supply by adjusting the first threshold voltage V2, so as to adjust the length of the second conduction period in each power frequency period of the power supply, further adjust the length of the conduction period in each power frequency period of the power supply, and further adjust the rotating speed of the motor 1. Compared with the scheme that the singlechip outputs PWM to control the conduction angle of the thyristor, the control circuit replaces the singlechip, the singlechip is not required to be used, the cost is lower, and the economy is better.
With continued reference to fig. 1, in the illustrated embodiment, the first charge-discharge circuit 51 further includes a first charging resistor 511, where a resistance value of the first charging resistor 511 is adjustable to adjust a charging speed of the first capacitor C1, thereby adjusting a length of the first delay period, adjusting a length of the delay period, and further adjusting a length of the on period, and adjusting 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 value of the adjustable resistor RP is adjusted, so as to adjust the resistance value of the first charging resistor 511, and change the charging speed of the first capacitor power supply VCC1 to the first capacitor C1.
In addition, in the actual use scenario, due to factors such as manufacturing errors, errors exist between the actual working characteristics and the nominal working characteristics 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 the target value, and errors still exist between the actual rotation speed and the target rotation speed of the motor 1, which brings trouble 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 rotation speed of the motor 1 is regulated to the target rotation speed by regulating 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 value of the sliding resistor is continuously adjustable, and further, the resistance value of the first charging resistor 511 is continuously adjustable, and the change of the resistance value of the first charging resistor 511 has continuity, so that the adjustment of the first charging resistor 511 is convenient, and the rotation speed of the motor 1 is adjusted. In another embodiment, the adjustable resistor RP is of other structures.
With continued reference to fig. 1, in the illustrated embodiment, the second charge-discharge circuit 53 further includes a second charging resistor 531, where a resistance value of the second charging resistor 531 is adjustable to adjust a charging speed of the second capacitor C2, thereby adjusting a length of the second delay period, adjusting a length of the delay period, and further adjusting a length of the on period, and adjusting a rotation speed of the motor 1.
In addition, in the actual use scene, because of different factors of the region, the power frequency of the power supply connected with the control circuit is different, so that even if the voltage V2 at the output end of the potentiometer 522 is unchanged, when one motor 1 is connected with the power supplies with different power frequencies through the control circuit, the rotating speed of the motor 1 also changes, 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, even if one motor 1 is connected to power sources with different power frequencies through a control circuit, the rotating speed of the motor 1 can be regulated to be unchanged through 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 with each other, and the second charging resistor 531 is switched 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 a power source, so that an operator can conveniently select the power frequency according to the power source directly. In the illustrated embodiment, the second charging resistor 531 includes a fixed resistor R2 and a fixed resistor R3 connected in parallel, and the jumper cap J1 makes the second charging resistor 531 switchable between the fixed resistor R2 and the fixed resistor R3, and alternatively connected to the second charging and discharging circuit 53, where the fixed resistor R2 and the fixed resistor R3 respectively correspond to a power supply of power frequency 60HZ and a power supply of power frequency 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 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 50HZ of power frequency, the power frequency period is long, so 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 are such that no matter the power supply of the power frequency 60HZ or the power supply of the power frequency 50HZ is connected, as long as the voltage V2 at the output end of the potentiometer 522 is unchanged, the ratio of the delay period to the power frequency period is unchanged, thereby ensuring that the rotating speed of the motor 1 is unchanged. In another embodiment, the second charging resistor 531 has other structures.
In the illustrated embodiment, the on period Ton within each power supply frequency period 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 supply 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 formula (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 of V3 to t is as follows:
wherein V3 is the voltage of the second capacitor C2, VCC2 is the voltage of the second capacitor power supply VCC2, R2 is the resistance of the fixed resistor R2, and 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 formula (3):
wherein t2 is a second delay period, and Vth is a second threshold voltage.
Thus, a delay period Toff is obtained:
Toff＝t1+t2 (5)
further, a second conduction period t4 is obtained:
t4＝T–Toff (6)
further, the on period Ton is obtained:
Ton＝t3+t4 (7)
wherein t3 is the first conduction period.
Although the invention has been described in terms of embodiments, it is not intended to be limited thereto, and variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (11)
1. A control circuit for motor speed regulation, comprising:
a timer, wherein the zero detection signal triggers the first switch signal to be output at a first end and the first charging signal to be output at a second end, and the power-on signal triggers the second switch signal to be output at the first end and the first discharging signal to be output at the second end; and
a charge-discharge circuit that starts charging in response to the first charge signal, thereby outputting the power-on signal over a delay period, and starts discharging in response to the first discharge signal, the delay period being adjustable;
wherein,
the charging and discharging circuit comprises a first charging and discharging circuit, the first charging and discharging circuit comprises a first capacitor and a first capacitor power supply, the first charging and discharging circuit is connected with the second end of the timer, charging is started in response to the first charging signal, and discharging is started in response to the first discharging 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 connected with the first charging and discharging circuit, the voltage of the first charging and discharging circuit is larger than or equal to the first threshold voltage, the adjusting module triggers and outputs a first signal, and the first signal triggers and outputs the power-on signal to the timer.
2. The control circuit for motor speed regulation of claim 1, wherein the regulation module comprises:
a potentiometer providing the adjustable first threshold voltage; and
and the comparator is triggered to output the first signal by the voltage of the first charge-discharge circuit being greater than or equal to the first threshold voltage.
3. The control circuit for motor speed regulation of claim 1, wherein the first charge-discharge circuit includes a first charge resistor, the resistance value of the first charge resistor being adjustable to adjust the charge rate of the first charge-discharge circuit.
4. A control circuit for motor speed regulation as claimed in claim 3, wherein the resistance of the first charging resistor is continuously adjustable.
5. The control circuit for motor speed regulation according to claim 1, wherein the charge-discharge circuit further includes a second charge-discharge circuit that starts charging in response to the first signal, thereby outputting the power-on signal.
6. The control circuit for motor speed regulation according to claim 5, wherein the timer has a second threshold voltage, the power-on signal is a voltage of the second charge-discharge circuit equal to or higher than the second threshold voltage, and the timer is triggered by the voltage of the second charge-discharge circuit equal to or higher than the second threshold voltage to output the second switching signal and the first discharge signal.
7. The control circuit for motor speed regulation of claim 5, wherein the second charge-discharge circuit includes a second charge resistor, the resistance value of the second charge resistor being adjustable to regulate the charge rate of the second charge-discharge circuit.
8. The control circuit for motor speed regulation of claim 7 wherein the second charging resistor comprises a plurality of fixed resistors connected in parallel with one another, the second charging resistor being switched between the plurality of fixed resistors such that one of the plurality of fixed resistors is connected to the second charge-discharge circuit.
9. A motor speed regulation control circuit comprising a control circuit as claimed in any one of claims 1 to 8;
the motor speed regulation control circuit further comprises a switch module, wherein the switch module is used for controlling the on-off of the power supply and the motor, the switch module is turned off in response to the first switch signal, and turned on in response to the second switch signal.
10. The motor governor control circuit of claim 9, wherein the switch module comprises:
the optical coupling module is turned off in response to the first switch signal and turned on in response to the second switch signal; and
and the thyristor module is turned off in response to the cut-off of the optocoupler module, and is turned on in response to the conduction of the optocoupler module.
11. The motor governor control circuit of claim 9, further comprising a zero point detection circuit that is triggered by a voltage zero crossing of a power source 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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| 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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| CN115395857A CN115395857A (en) | 2022-11-25 |
| CN115395857B true CN115395857B (en) | 2024-04-05 |
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| CN101089909A (en) * | 2006-06-13 | 2007-12-19 | 上海亿盟电气自动化技术有限公司 | Sine-way zero trigger circuit |
| CN105207543A (en) * | 2015-10-12 | 2015-12-30 | 上海晶丰明源半导体有限公司 | Analog closed loop speed control device and method for brushless direct current motor |
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|---|---|---|---|---|
| CN105119538B (en) * | 2015-09-17 | 2018-06-26 | 矽力杰半导体技术(杭州)有限公司 | The driving circuit and driving method of a kind of permanent magnet synchronous motor |
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| CN1135111A (en) * | 1995-05-02 | 1996-11-06 | 吴润博 | Protective circuit for charging or discharging conversion |
| JPH10177044A (en) * | 1996-12-19 | 1998-06-30 | Toshiba Microelectron Corp | Zero cross detector circuit |
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| CN115395857A (en) | 2022-11-25 |
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