CN112366984A - Temperature-adaptive PG motor drive control system and method - Google Patents
Temperature-adaptive PG motor drive control system and method Download PDFInfo
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
- H02P1/027—Special design of starting resistor
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
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Abstract
The invention provides a temperature self-adaptive PG motor drive control system and a temperature self-adaptive PG motor drive control method; the system comprises a PG motor driving loop, a silicon controlled rectifier driving voltage loop, a first silicon controlled rectifier driving current control loop, a second silicon controlled rectifier driving current control loop, a temperature detection unit and a control unit; the PG motor driving loop is connected with the controlled silicon driving voltage loop and the second controlled silicon driving current control loop; the silicon controlled rectifier driving voltage loop is connected with the first silicon controlled rectifier driving current control loop and the second silicon controlled rectifier driving current control loop; the first silicon controlled rectifier driving current control loop is connected with the control unit and the second silicon controlled rectifier driving current control loop; the second silicon controlled rectifier driving current control loop and the temperature detection unit are both connected with the control unit; the invention can reasonably select different driving resistors according to different environmental temperatures, thereby realizing the purpose of configuring different driving currents.
Description
Technical Field
The invention belongs to the technical field of PG motor drive control, and particularly relates to a temperature-adaptive PG motor drive control system and method.
Background
The PG motor means that the rotating speed of the motor is controlled by the conduction angle of a silicon controlled rectifier, but not by a relay; according to the characteristics of the controllable silicon, the required driving current capability of the controllable silicon is different along with the change of temperature, the driving current required at low temperature is high, and the driving current required at high temperature is low.
The magnitude of the existing silicon controlled rectifier driving current is determined by a fixed value resistor, the resistance value of the selected fixed value resistor is large, and the corresponding driving current is small; the resistance value of the selected constant value resistor is small, and the corresponding driving current is large; however, since the driving current required by the thyristor is different with the temperature, if the resistance value selected by the constant value resistor is large, the driving current is small, and the situation of low temperature non-starting can occur; if the resistance value of the fixed-value resistor is selected to be small, the driving current is large, the low-temperature characteristic can be met, and the problems that the driving current is excessive and the power consumption is increased under the conditions of normal temperature and high temperature exist.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a temperature adaptive PG motor driving control system and method, which are used to solve the problem that the resistance for controlling the magnitude of the driving current of the thyristors in the prior art cannot meet the requirement varying with the temperature.
To achieve the above and other related objects, the present invention provides a temperature adaptive PG motor drive control system, comprising: the power supply comprises a PG motor driving loop, a silicon controlled rectifier driving voltage loop, a first silicon controlled rectifier driving current control loop, a second silicon controlled rectifier driving current control loop, a temperature detection unit and a control unit; the PG motor driving loop is respectively connected with the controlled silicon driving voltage loop and the second controlled silicon driving current control loop and is used for driving the PG motor; the controllable silicon driving voltage loop is respectively connected with the first controllable silicon driving current control loop and the second controllable silicon driving current control loop and is used for providing driving voltage for the PG motor driving loop; the first silicon controlled drive current control loop is respectively connected with the control unit and the second silicon controlled drive current control loop and is used for controlling whether drive current is supplied to the PG motor drive loop under the action of the control unit; the second silicon controlled drive current control loop is connected with the control unit and used for controlling whether drive current is supplied to the PG motor drive loop or not under the action of the control unit; the temperature detection unit is connected with the control unit and used for detecting the current environment temperature; the control unit is used for controlling whether the first silicon controlled rectifier driving current control loop has driving current or not and controlling whether the second silicon controlled rectifier driving current control loop has driving current or not according to the current environment temperature; when the current environment temperature is higher than a first preset temperature, the control unit respectively sends control signals to the first silicon controlled rectifier driving current control loop and the second silicon controlled rectifier driving current control loop to control the first silicon controlled rectifier driving current control loop to have driving current and control the second silicon controlled rectifier driving current control loop to have no driving current; when the current environment temperature is lower than a second preset temperature, the control unit respectively sends control signals to the first silicon controlled rectifier driving current control loop and the second silicon controlled rectifier driving current control loop to control no driving current in the first silicon controlled rectifier driving current control loop and control driving current in the second silicon controlled rectifier driving current control loop; the first preset temperature is higher than the second preset temperature.
In an embodiment of the present invention, the PG motor driving circuit includes: the power supply comprises a first power supply, a controllable silicon, a first socket and a second socket; the first end of the first socket is connected with the third end of the second socket and is commonly connected to the silicon controlled rectifier driving voltage loop; the zero line end of the first power supply is connected with the first end of the first socket, and the fire line end of the first power supply is connected with the third end of the first socket; the first end of the controlled silicon is connected with the third end of the first socket and is commonly connected to the controlled silicon driving voltage loop; the second end of the controllable silicon is connected with the first end of the second socket, and the third end of the controllable silicon is connected with the second controllable silicon driving current control loop; and two terminals of the PG motor are respectively connected with the first end of the second socket and the third end of the second socket.
In an embodiment of the present invention, the scr driving voltage circuit includes: the circuit comprises a first resistor, a second resistor, a first diode, a second diode, a first capacitor and a second capacitor; one end of the first resistor, one end of the first capacitor, one end of the second capacitor and the anode of the second diode are connected and are connected to the PG motor driving loop together; the other end of the first resistor, the other end of the first capacitor, the other end of the second capacitor and the cathode of the second diode are connected, and are commonly connected to the first silicon controlled drive current control loop, the second silicon controlled drive current control loop and one end of the second resistor; the other end of the second resistor is connected with the cathode of the first diode; and the anode of the first diode is connected with the PG motor driving loop.
In an embodiment of the present invention, the first resistor and the second resistor both adopt voltage dividing resistors; the first capacitor adopts an electrolytic capacitor; and the second diode adopts a voltage stabilizing diode.
In an embodiment of the present invention, the first scr driving current control loop includes: the circuit comprises a first optocoupler, a third resistor, a fourth resistor and a fifth resistor; a first end of the first optical coupler is connected with a second power supply and one end of the third resistor respectively, a second end of the first optical coupler is connected with the other end of the third resistor and one end of the fourth resistor respectively, a third end of the first optical coupler is connected with the second silicon controlled rectifier driving current control loop and the silicon controlled rectifier driving voltage loop respectively, and a fourth end of the first optical coupler is connected with one end of the fifth resistor; the other end of the fourth resistor is connected with the first end of the control unit; the other end of the fifth resistor is connected with the second silicon controlled rectifier driving current control loop; when the current environment temperature is higher than the first preset temperature, the control unit controls the first optocoupler to be switched on so as to control the first silicon controlled rectifier to drive current in the current control loop; when the current environment temperature is lower than the second preset temperature, the control unit controls the first optocoupler to be switched off so as to control the first silicon controlled rectifier to drive no driving current in the current control loop.
In an embodiment of the present invention, the third resistor is a bleeder resistor; the fourth resistor is a current limiting resistor.
In an embodiment of the present invention, the second scr driving current control loop includes: the second optocoupler, the sixth resistor, the seventh resistor and the eighth resistor; a first end of the second optocoupler is connected with a third power supply and one end of the seventh resistor respectively, a second end of the second optocoupler is connected with the other end of the seventh resistor and one end of the eighth resistor respectively, a third end of the second optocoupler is connected with the thyristor driving voltage loop and the first thyristor driving current control loop respectively, and a fourth end of the second optocoupler is connected with one end of the sixth resistor and the first thyristor driving current control loop respectively; the other end of the sixth resistor is connected with the PG motor driving loop; the other end of the eighth resistor is connected with the second end of the control unit; when the current environment temperature is lower than the second preset temperature, the control unit controls the second optocoupler to be switched on so as to control the second silicon controlled rectifier to drive current in the current control loop; when the current environment temperature is higher than the first preset temperature, the control unit controls the second optocoupler to be switched off so as to control the second silicon controlled rectifier to drive no driving current in the current control loop.
In an embodiment of the present invention, the temperature detecting unit includes: the temperature sensor, the third socket, the ninth resistor and the third capacitor; the temperature sensor is connected with the third socket; one end of the ninth resistor is connected with one end of the third capacitor, and is commonly connected to the first end of the third socket and the third end of the control unit, and the other end of the ninth resistor and the other end of the third capacitor are commonly grounded; and the second end of the third socket is connected with a fourth power supply.
In an embodiment of the present invention, the control unit employs an MCU.
The invention provides a temperature self-adaptive PG motor drive control method realized by adopting the temperature self-adaptive PG motor drive control system, which comprises the following steps of: detecting the current environment temperature through a temperature detection unit, and sending the current environment temperature to a control unit; when the current environment temperature is higher than a first preset temperature, the control unit respectively sends control signals to a first silicon controlled rectifier driving current control loop and a second silicon controlled rectifier driving current control loop to control the first silicon controlled rectifier driving current control loop to have driving current and control the second silicon controlled rectifier driving current control loop to have no driving current; when the current environment temperature is lower than a second preset temperature, the control unit respectively sends control signals to the first silicon controlled rectifier driving current control loop and the second silicon controlled rectifier driving current control loop to control that no driving current exists in the first silicon controlled rectifier driving current control loop and control that driving current exists in the second silicon controlled rectifier driving current control loop.
As described above, the temperature adaptive PG motor drive control system and method of the present invention have the following advantages:
(1) compared with the prior art, the PG motor has the advantages that different driving resistors can be reasonably selected according to different environmental temperatures by adding the silicon controlled driving current control loop and the temperature detection unit, so that the purpose of configuring different driving currents is realized, the use temperature range of the PG motor is widened, and the requirement that the resistor for controlling the magnitude of the silicon controlled driving current changes along with different temperatures is met.
(2) The invention can realize normal drive starting under the condition of low temperature; under the conditions of normal temperature and high temperature, the driving current is reduced, and the surplus of the driving current is effectively avoided, so that the power consumption of the controllable silicon and the system power consumption are reduced, and the PG motor driving control system is more energy-saving and environment-friendly.
Drawings
Fig. 1 is a block diagram illustrating the operation of the temperature adaptive PG motor driving control system according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a temperature adaptive PG motor driving control system according to an embodiment of the present invention.
FIG. 3 is a circuit diagram of a temperature detecting unit according to an embodiment of the invention.
Fig. 4 is a flowchart illustrating a temperature adaptive PG motor driving control method according to an embodiment of the present invention.
Description of the reference symbols
1 PG motor drive circuit
2 silicon controlled rectifier driving voltage loop
3 first controlled silicon drive current control loop
4 second silicon controlled rectifier drive current control loop
5 temperature detecting unit
6 control unit
7 PG motor
S1-S2
Detailed Description
The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Compared with the prior art, the temperature self-adaptive PG motor drive control system and method can realize the reasonable selection of different drive resistors aiming at different environmental temperatures by adding the controlled silicon drive current control loop and the temperature detection unit, thereby realizing the purpose of configuring different drive currents, widening the use temperature range of the PG motor and meeting the requirement that the resistor for controlling the magnitude of the controlled silicon drive current changes along with different temperatures; the invention can realize normal drive starting under the condition of low temperature; under the conditions of normal temperature and high temperature, the driving current is reduced, and the surplus of the driving current is effectively avoided, so that the power consumption of the controllable silicon and the system power consumption are reduced, and the PG motor driving control system is more energy-saving and environment-friendly.
As shown in fig. 1, in an embodiment of the invention, the temperature adaptive PG motor driving control system includes a PG motor driving circuit 1, a scr driving voltage circuit 2, a first scr driving current control circuit 3, a second scr driving current control circuit 4, a temperature detection unit 5, and a control unit 6.
Specifically, the PG motor driving circuit 1 is connected to the thyristor driving voltage circuit 2 and the second thyristor driving current control circuit 4, respectively, for driving the PG motor 7.
And the controlled silicon driving voltage loop 2 is respectively connected with the first controlled silicon driving current control loop 3 and the second controlled silicon driving current control loop 4 and is used for providing driving voltage for the PG motor driving loop 1.
The first silicon controlled drive current control loop 3 is respectively connected with the control unit 6 and the second silicon controlled drive current control loop 4, and is used for controlling whether drive current is supplied to the PG motor drive loop 1 under the action of the control unit 6.
The second silicon controlled drive current control loop 4 is connected with the control unit 6, and is used for controlling whether drive current is supplied to the PG motor drive loop 1 under the action of the control unit 6.
The temperature detection unit 5 is connected with the control unit 6 and used for detecting the current environment temperature.
And the control unit 6 is used for controlling whether the driving current exists in the first silicon controlled drive current control loop 3 and controlling whether the driving current exists in the second silicon controlled drive current control loop 4 according to the current environment temperature.
In an embodiment, the control unit 6 is an MCU.
It should be noted that, when the current ambient temperature is higher than a first preset temperature, the control unit 6 sends control signals to the first thyristor drive current control loop 3 and the second thyristor drive current control loop 4 respectively, so as to control the first thyristor drive current control loop 3 to have drive current and control the second thyristor drive current control loop 4 to have no drive current; when the current environment temperature is lower than a second preset temperature, the control unit 6 sends control signals to the first silicon controlled drive current control loop 3 and the second silicon controlled drive current control loop 4 respectively to control that no drive current exists in the first silicon controlled drive current control loop 3 and control that drive current exists in the second silicon controlled drive current control loop 4.
It should be noted that, the first preset temperature and the second preset temperature are both preset values and are both constant values, but the specific values are not taken as conditions for limiting the present invention and may be determined according to actual application scenarios, and it is only required to ensure that the first preset temperature is higher than the second preset temperature.
As shown in fig. 1 and fig. 2, in an embodiment, the PG motor driving circuit 1 includes a first power source (a 220V power source), a thyristor Q1, a first socket CN1, and a second socket CN 2.
Specifically, the first terminal 1 of the first socket CN1 is connected to the third terminal 3 of the second socket CN2, and is commonly connected to the thyristor driving voltage loop 2; the zero line end N of the first power supply is connected with the first end 1 of the first socket CN1, and the fire line end L of the first power supply is connected with the third end 3 of the first socket CN 1; the first terminal 1 of the thyristor Q1 is connected with the third terminal 3 of the first socket CN1, and is commonly connected to the thyristor driving voltage loop 2; the second end 2 of the thyristor Q1 is connected with the first end 1 of the second socket CN2, and the third end 3 of the thyristor Q1 is connected with the second thyristor driving current control loop 4; two terminals of the PG motor 7 are connected to the first terminal 1 of the second socket CN2 and the third terminal 3 of the second socket CN2, respectively.
As shown in fig. 2, in an embodiment, the scr driving voltage circuit 2 includes a first resistor R1, a second resistor R2, a first diode D1, a second diode ZD1, a first capacitor E1, and a second capacitor C1.
Specifically, one end of the first resistor R1, one end of the first capacitor E1, one end of the second capacitor C1, and the anode of the second diode ZD1 are connected, and are commonly connected to the first end 1 of the thyristor Q1 in the PG motor driving circuit 1 and the third end 3 of the first socket CN 1; the other end of the first resistor R1, the other end of the first capacitor E1, the other end of the second capacitor C1, and the cathode of the second diode ZD1 are connected, and are commonly connected to the first thyristor drive current control circuit 3, the second thyristor drive current control circuit 4, and one end of the second resistor R2; the other end of the second resistor R2 is connected with the cathode of the first diode D1; the anode of the first diode D1 is connected to the first terminal 1 of the first socket CN1 and the third terminal 3 of the second socket CN2 in the PG motor driving circuit 1.
In one embodiment, the first resistor R1 and the second resistor R2 both use voltage dividing resistors; the first capacitor E1 adopts an electrolytic capacitor; the second diode ZD1 is a zener diode.
It should be noted that the driving voltage of the thyristor Q1 is obtained by the voltage dividing resistors (the first resistor R1 and the second resistor R2), and the electrolytic capacitor (the first capacitor E1) and the zener diode (the second diode ZD1) are adopted to ensure the stability of the driving voltage.
As shown in fig. 1 and fig. 2, in an embodiment, the first scr driving current control loop 3 includes a first optocoupler PC1, a third resistor R3, a fourth resistor R4, and a fifth resistor R5.
Specifically, a first end 1 of the first optical coupler PC1 is connected to a second power supply (+12V) and one end of the third resistor R3, a second end 2 of the first optical coupler PC1 is connected to the other end of the third resistor R3 and one end of the fourth resistor R4, a third end 3 of the first optical coupler PC1 is connected to the other end of the first resistor R1, the other end of the first capacitor E1, the other end of the second capacitor C1, and a cathode of the second diode ZD1 in the second thyristor driving current control circuit 4 and the thyristor driving voltage circuit 2, and a fourth end 4 of the first optical coupler PC1 is connected to one end of the fifth resistor R5; the other end of the fourth resistor R4 is connected with a first end (corresponding to MCU PIN1 in FIG. 2) of the control unit 6; the other end of the fifth resistor R5 is connected to the second thyristor drive current control loop 4.
It should be noted that, when the current ambient temperature is higher than the first preset temperature, the control unit 6 controls the first optocoupler PC1 to be turned on, so as to control the driving current in the first thyristor driving current control loop 3; when the current environment temperature is lower than the second preset temperature, the control unit 6 controls the first optical coupler PC1 to be switched off so as to control no driving current in the first silicon controlled driving current control loop 3.
In one embodiment, the third resistor R3 is a bleeder resistor; the fourth resistor R4 adopts a current limiting resistor.
As shown in fig. 1 and fig. 2, in an embodiment, the second scr driving current control circuit 4 includes a second optocoupler PC2, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8.
Specifically, a first end 1 of the second optical coupler PC2 is connected to a third power supply (+12V) and one end of the seventh resistor R7, a second end 2 of the second optical coupler PC2 is connected to the other end of the seventh resistor R7 and one end of the eighth resistor R8, a third end 3 of the second optical coupler PC2 is connected to the other end of the first resistor R1, the other end of the first capacitor E1, the other end of the second capacitor C1, a cathode of the second diode ZD1, and a third end of the first optical coupler PC1 in the first thyristor-driven current control circuit 3 in the thyristor-driven voltage circuit 2, and a fourth end 4 of the second optical coupler PC2 is connected to one end of the sixth resistor R6 and the other end of the fifth resistor R5 in the first thyristor-driven current control circuit 3; the other end of the sixth resistor R6 is connected with the third end 3 of a thyristor Q1 in the PG motor driving loop 1; the other end of the eighth resistor R8 is connected to a second end (corresponding to MCU PIN2 in fig. 2) of the control unit 6.
It should be noted that, when the current ambient temperature is lower than the second preset temperature, the control unit 6 controls the second optical coupler PC2 to be turned on, so as to control the driving current in the second thyristor driving current control loop 4; when the current environment temperature is higher than the first preset temperature, the control unit 6 controls the second optical coupler PC2 to be switched off so as to control no driving current in the second silicon controlled driving current control loop 4.
As shown in fig. 1 and 3, in an embodiment, the temperature detecting unit 5 includes a temperature sensor, a third socket CN3, a ninth resistor R9, and a third capacitor C2.
Specifically, the temperature sensor is connected with the third socket CN 3; one end of the ninth resistor R9 is connected to one end of the third capacitor C2, and is commonly connected to the first end 1 of the third socket CN3 and the third end of the control unit 6 (corresponding to the MCU PIN3 in fig. 3), and the other end of the ninth resistor R9 and the other end of the third capacitor C2 are commonly grounded; the second end 2 of the third socket CN3 is connected to a fourth power supply (+ 3.3V).
It should be noted that the operating principle of the temperature adaptive PG motor drive control system is as follows: firstly, inputting a single-phase 220V power supply; then, chopping is carried out on the voltage through the connection and disconnection of the silicon controlled rectifier to obtain the output with variable voltage, and different voltage outputs correspond to different rotating speeds; finally, controlling the rotating speed of the PG motor according to the requirement; the on and off of the silicon controlled rectifier is controlled by the driving current, and the MCU chip controls the on and off of the optical couplers (the first optical coupler PC1 and the second optical coupler PC2), so that the control of the driving current is realized.
Specifically, one silicon controlled rectifier driving current control loop (a second silicon controlled rectifier driving current control loop 4) is added, and a temperature sensor is added to detect the current environment temperature and transmit the current environment temperature to the MCU for judgment; when the current environment temperature is higher than a first preset temperature, the MCU sends a high-level control signal to the first optical coupler PC1 to control the first optical coupler PC1 to be switched on (namely, the first silicon controlled rectifier drives the drive current in the current control loop 3), and simultaneously, the MCU sends a low-level control signal to the second optical coupler PC2 to control the second optical coupler PC2 to be switched off (namely, no drive current exists in the second silicon controlled rectifier drive current control loop 4), so that the fifth resistor R5 and the sixth resistor R6 which are connected in series are used as drive resistors (R5+ R6) to provide drive current for the silicon controlled rectifier Q1; when the current environment temperature is lower than a second preset temperature, the MCU sends a high-level control signal to the second optical coupler PC2 to control the second optical coupler PC2 to be switched on (namely, the second silicon controlled rectifier drive current control loop 4 has drive current), and simultaneously, the MCU sends a low-level control signal to the first optical coupler PC1 to control the first optical coupler PC1 to be switched off (namely, no drive current exists in the first silicon controlled rectifier drive current control loop 3), so that the sixth resistor R6 is used as a drive resistor to provide drive current for the silicon controlled rectifier Q1.
Furthermore, the number of the thyristor driving current control loops is not limited to two in the invention (the first thyristor driving current control loop 3 and the second thyristor driving current control loop 4); similarly, on the basis of the present invention, it is within the protection scope of the present invention to add one or more thyristor driving current control loops (the specific working principle is the same as above), or to make structural modifications and substitutions according to the principle of the present invention in the prior art.
The temperature adaptive PG motor drive control system of the present invention is further explained by the following embodiments.
Taking silicon controlled rectifier BT137S-600 as an example, the drive current required by-25 ℃ is twice of the normal temperature of 25 ℃, in order to meet the requirements of the normal temperature and the low temperature, the current environment temperature is detected through a temperature sensor, when the temperature is higher than 5 ℃ (corresponding to a first preset temperature), MCU PIN1 is set to be at a high level, a first optical coupler PC1 is controlled to be switched on, and the drive current is supplied to a silicon controlled rectifier Q1 through a circuit formed by connecting a fifth resistor R5 and a sixth resistor R6 in series; when the current environment temperature is lower than 0 ℃ (corresponding to a second preset temperature), the MCU PIN2 is set to be at a high level, the second optical coupler PC2 is controlled to be switched on, and the drive current is provided for the controlled silicon Q1 through the sixth resistor R6.
In an embodiment, the resistances of the fifth resistor R5 and the sixth resistor R6 are equal, so that at normal temperature, half of the power consumption can be saved.
As shown in fig. 4, in an embodiment of the invention, the temperature adaptive PG motor driving control method implemented by the above temperature adaptive PG motor driving control system includes the following steps:
and step S1, detecting the current environment temperature through the temperature detection unit, and sending the current environment temperature to the control unit.
Step S2, when the current environment temperature is higher than a first preset temperature, the control unit respectively sends control signals to a first silicon controlled rectifier driving current control loop and a second silicon controlled rectifier driving current control loop to control the first silicon controlled rectifier driving current control loop to have driving current and control the second silicon controlled rectifier driving current control loop to have no driving current; when the current environment temperature is lower than a second preset temperature, the control unit respectively sends control signals to the first silicon controlled rectifier driving current control loop and the second silicon controlled rectifier driving current control loop to control that no driving current exists in the first silicon controlled rectifier driving current control loop and control that driving current exists in the second silicon controlled rectifier driving current control loop.
It should be noted that the protection scope of the temperature adaptive PG motor driving control method of the present invention is not limited to the execution sequence of the steps listed in this embodiment, and all the solutions implemented by the steps addition, subtraction, and step replacement of the prior art according to the principle of the present invention are included in the protection scope of the present invention.
It should be noted that the working principle of the temperature adaptive PG motor driving control method is the same as that of the temperature adaptive PG motor driving control system, and therefore, the description thereof is omitted here.
In summary, compared with the prior art, the temperature-adaptive PG motor drive control system and method provided by the invention have the advantages that by adding the thyristor drive current control loop and the temperature detection unit, different drive resistors can be reasonably selected according to different environmental temperatures, so that the purpose of configuring different drive currents is realized, the use temperature range of the PG motor is widened, and the requirement that the resistor for controlling the magnitude of the thyristor drive current changes along with different temperatures is met; the invention can realize normal drive starting under the condition of low temperature; under the conditions of normal temperature and high temperature, the driving current is reduced, and the excessive driving current is effectively avoided, so that the power consumption of the controllable silicon and the system power consumption are reduced, and the PG motor driving control system is more energy-saving and environment-friendly; therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A temperature adaptive PG motor drive control system, characterized by comprising: the power supply comprises a PG motor driving loop, a silicon controlled rectifier driving voltage loop, a first silicon controlled rectifier driving current control loop, a second silicon controlled rectifier driving current control loop, a temperature detection unit and a control unit;
the PG motor driving loop is respectively connected with the controlled silicon driving voltage loop and the second controlled silicon driving current control loop and is used for driving the PG motor;
the controllable silicon driving voltage loop is respectively connected with the first controllable silicon driving current control loop and the second controllable silicon driving current control loop and is used for providing driving voltage for the PG motor driving loop;
the first silicon controlled drive current control loop is respectively connected with the control unit and the second silicon controlled drive current control loop and is used for controlling whether drive current is supplied to the PG motor drive loop under the action of the control unit;
the second silicon controlled drive current control loop is connected with the control unit and used for controlling whether drive current is supplied to the PG motor drive loop or not under the action of the control unit;
the temperature detection unit is connected with the control unit and used for detecting the current environment temperature;
the control unit is used for controlling whether the first silicon controlled rectifier driving current control loop has driving current or not and controlling whether the second silicon controlled rectifier driving current control loop has driving current or not according to the current environment temperature;
when the current environment temperature is higher than a first preset temperature, the control unit respectively sends control signals to the first silicon controlled rectifier driving current control loop and the second silicon controlled rectifier driving current control loop to control the first silicon controlled rectifier driving current control loop to have driving current and control the second silicon controlled rectifier driving current control loop to have no driving current; when the current environment temperature is lower than a second preset temperature, the control unit respectively sends control signals to the first silicon controlled rectifier driving current control loop and the second silicon controlled rectifier driving current control loop to control no driving current in the first silicon controlled rectifier driving current control loop and control driving current in the second silicon controlled rectifier driving current control loop; the first preset temperature is higher than the second preset temperature.
2. The temperature-adaptive PG motor drive control system of claim 1, wherein the PG motor drive loop comprises: the power supply comprises a first power supply, a controllable silicon, a first socket and a second socket;
the first end of the first socket is connected with the third end of the second socket and is commonly connected to the silicon controlled rectifier driving voltage loop;
the zero line end of the first power supply is connected with the first end of the first socket, and the fire line end of the first power supply is connected with the third end of the first socket;
the first end of the controlled silicon is connected with the third end of the first socket and is commonly connected to the controlled silicon driving voltage loop; the second end of the controllable silicon is connected with the first end of the second socket, and the third end of the controllable silicon is connected with the second controllable silicon driving current control loop;
and two terminals of the PG motor are respectively connected with the first end of the second socket and the third end of the second socket.
3. The temperature-adaptive PG motor drive control system of claim 1, wherein the thyristor drive voltage loop comprises: the circuit comprises a first resistor, a second resistor, a first diode, a second diode, a first capacitor and a second capacitor;
one end of the first resistor, one end of the first capacitor, one end of the second capacitor and the anode of the second diode are connected and are connected to the PG motor driving loop together;
the other end of the first resistor, the other end of the first capacitor, the other end of the second capacitor and the cathode of the second diode are connected, and are commonly connected to the first silicon controlled drive current control loop, the second silicon controlled drive current control loop and one end of the second resistor;
the other end of the second resistor is connected with the cathode of the first diode;
and the anode of the first diode is connected with the PG motor driving loop.
4. The temperature-adaptive PG motor drive control system of claim 3, characterized in that, the first resistance and the second resistance both adopt voltage dividing resistances; the first capacitor adopts an electrolytic capacitor; and the second diode adopts a voltage stabilizing diode.
5. The temperature-adaptive PG motor drive control system of claim 1, wherein said first thyristor drive current control loop comprises: the circuit comprises a first optocoupler, a third resistor, a fourth resistor and a fifth resistor;
a first end of the first optical coupler is connected with a second power supply and one end of the third resistor respectively, a second end of the first optical coupler is connected with the other end of the third resistor and one end of the fourth resistor respectively, a third end of the first optical coupler is connected with the second silicon controlled rectifier driving current control loop and the silicon controlled rectifier driving voltage loop respectively, and a fourth end of the first optical coupler is connected with one end of the fifth resistor;
the other end of the fourth resistor is connected with the first end of the control unit;
the other end of the fifth resistor is connected with the second silicon controlled rectifier driving current control loop;
when the current environment temperature is higher than the first preset temperature, the control unit controls the first optocoupler to be switched on so as to control the first silicon controlled rectifier to drive current in the current control loop; when the current environment temperature is lower than the second preset temperature, the control unit controls the first optocoupler to be switched off so as to control the first silicon controlled rectifier to drive no driving current in the current control loop.
6. The temperature-adaptive PG motor drive control system of claim 5 wherein said third resistor is a bleeder resistor; the fourth resistor is a current limiting resistor.
7. The temperature-adaptive PG motor drive control system of claim 1, wherein said second scr drive current control loop comprises: the second optocoupler, the sixth resistor, the seventh resistor and the eighth resistor;
a first end of the second optocoupler is connected with a third power supply and one end of the seventh resistor respectively, a second end of the second optocoupler is connected with the other end of the seventh resistor and one end of the eighth resistor respectively, a third end of the second optocoupler is connected with the thyristor driving voltage loop and the first thyristor driving current control loop respectively, and a fourth end of the second optocoupler is connected with one end of the sixth resistor and the first thyristor driving current control loop respectively;
the other end of the sixth resistor is connected with the PG motor driving loop;
the other end of the eighth resistor is connected with the second end of the control unit;
when the current environment temperature is lower than the second preset temperature, the control unit controls the second optocoupler to be switched on so as to control the second silicon controlled rectifier to drive current in the current control loop; when the current environment temperature is higher than the first preset temperature, the control unit controls the second optocoupler to be switched off so as to control the second silicon controlled rectifier to drive no driving current in the current control loop.
8. The temperature-adaptive PG motor drive control system of claim 1, wherein the temperature detection unit comprises: the temperature sensor, the third socket, the ninth resistor and the third capacitor;
the temperature sensor is connected with the third socket;
one end of the ninth resistor is connected with one end of the third capacitor, and is commonly connected to the first end of the third socket and the third end of the control unit, and the other end of the ninth resistor and the other end of the third capacitor are commonly grounded;
and the second end of the third socket is connected with a fourth power supply.
9. The temperature-adaptive PG motor drive control system of claim 1, characterized in that, the control unit employs an MCU.
10. A temperature-adaptive PG motor drive control method implemented by using the temperature-adaptive PG motor drive control system according to any one of claims 1 to 9, comprising the steps of:
detecting the current environment temperature through a temperature detection unit, and sending the current environment temperature to a control unit;
when the current environment temperature is higher than a first preset temperature, the control unit respectively sends control signals to a first silicon controlled rectifier driving current control loop and a second silicon controlled rectifier driving current control loop to control the first silicon controlled rectifier driving current control loop to have driving current and control the second silicon controlled rectifier driving current control loop to have no driving current;
when the current environment temperature is lower than a second preset temperature, the control unit respectively sends control signals to the first silicon controlled rectifier driving current control loop and the second silicon controlled rectifier driving current control loop to control that no driving current exists in the first silicon controlled rectifier driving current control loop and control that driving current exists in the second silicon controlled rectifier driving current control loop.
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| CN112366984B (en) | 2022-03-25 |
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